CN102817309B - Infrared heater for heating pitch on inspection wellhead road surface - Google Patents

Abstract

The utility model relates to an infrared heater for heating asphalt at the mouth of a manhole, which belongs to the field of municipal maintenance and construction facilities. It consists of a pair of racks on which the rack guards are fixed, a liquefied gas tank seat and an electrical control box are arranged on the rack guards, and a group of infrared radiation heating mechanisms are fixed on the downward facing side of the pair of racks; the gas pipe , the central position constitutes a gas inlet connector, a group of gas outlet connectors are formed in the length direction of the gas pipe, and the gas outlet connector is connected with a mixed gas outlet mechanism. There is a semicircle relief cavity at the mouth of the inspection well, and a secondary ignition mechanism is set on a pair of racks. The secondary ignition mechanism includes an igniter fixing seat fixing plate, an igniter fixing seat, an ignition tube, the first high-voltage electronic ignition head and the second Two high-voltage electronic ignition heads. Advantages: ensure safety, ensure the effect of heating the road asphalt at the same time; avoid heating the area of the manhole cover, save energy, and avoid damage to the manhole cover.

Description

Infrared heater for heating asphalt at the mouth of manhole

technical field

The invention belongs to the technical field of municipal maintenance construction facilities, and in particular relates to an infrared heater for heating asphalt on the pavement at the mouth of a manhole .

Background technique

In order to meet the water supply and drainage requirements of municipal roads, a water supply and drainage pipe network is usually laid under the road, and inspection wells with the upper part and the height of the road surface are arranged at reasonable distances, and inspection well covers are placed on the inspection wells. The cover plays the role of shielding the inspection well, on the one hand, it ensures the safety of passing pedestrians and vehicles, and on the other hand, it provides an entrance for the maintenance of water supply and drainage pipelines such as dredging the sewer.

As is well known in the industry, since the joint between the inspection well and the asphalt road is significantly weaker than other parts of the road, after the asphalt road has been put into use for a period of time, the road surface around the inspection well cover is prone to appear such as scattered cracks, potholes, etc. Damage phenomena such as water leakage must be repaired in time, otherwise it will affect the inspection well and even affect the water supply and drainage pipe network, and also affect the safety of passing pedestrians and/or vehicles.

The original method of repairing the aforementioned potholes and scattered cracks usually uses oil pack repair, which has the advantages of quick fix and material saving, but because the bubble pack injected into the potholes and cracks cannot be compared with the road asphalt It produces a good bonding effect between them, so it is very easy to peel off and cause frequent repairs. Yet if in order to improve the ideal bonding effect between the asphalt for repairing and the original asphalt of the road, the road surface around the manhole mouth will be planed, so the following technical problems will undoubtedly be produced: the one, the construction period is long and will Affect traffic; second, the maintenance workload is heavy and the work intensity of the municipal maintenance workers is high; third, the input of raw materials is large and waste is unavoidable.

Utilize the heater that helps to soften the asphalt to heat the asphalt around the manhole cover to soften the original roadbed or road surface asphalt so that the repaired asphalt can be reliably combined with it. There is a lot of technical information about asphalt pavement heaters in Chinese patent literature, such as: ZL03264008.0 (high-efficiency microwave pavement heater), ZL03264009.9 (microwave asphalt pavement heater), ZL200420046641.2 (safe and reliable microwave pavement heater), ZL200420047053.0 (microwave pavement heater), ZL200420071607.0 (microwave pavement heater) and ZL200520055873.9 (water vapor microwave pavement heater), etc. wait.

It is not limited to the advantages and disadvantages of the patented technical solutions exemplified above, which are pointed out in column 0002 of the description of "Heating Mechanism of Asphalt Pavement Heating Machine" provided by the invention patent application publication number CN101718073A. In addition, the "asphalt pavement heating machine" recommended by CN2856135Y has certain advantages in terms of concise overall structure and convenient operation. For details, please refer to the last paragraph on page 2 of the instruction manual of CN2856135Y.

However, the above-mentioned patented technical solutions including CN101718073Y and CN2856135Y also have the following common problems that have not been discovered by people or have been discovered and cannot be solved: one, it is not suitable for heating the asphalt pavement around the inspection well mouth, because the inspection shaft The mouth area is protected by the manhole cover, and the manhole cover is exposed and not covered with asphalt (should not be covered with asphalt), and because the heater only needs to heat the asphalt around the manhole mouth, but when using the above-mentioned patented solution to the asphalt When the road surface is heated, it often shows that it is heated together with the manhole cover, so on the one hand, it causes energy waste, and on the other hand, there is a risk of high temperature damage to the manhole cover; When igniting, the electronic igniter needs to implement multi-point electronic ignition for multiple (CN2856135Y indicates six) radiation heating machines, so there is usually a situation where one or more radiation heating mechanisms are not ignited, so when the combustible gas is introduced, it will There is a sound, and even an astonishing sound like an explosion occurs because the gas that enters cannot be completely burned in time and is accompanied by serious safety hazards.

In view of the above-mentioned prior art, the applicant has made a long-term and active design, found a solution to the problem, and carried out experiments in the applicant's factory area after taking strict confidentiality measures, the results proved to be practicable, as follows The technical solution to be introduced is produced under this background .

Contents of the invention

The task of the present invention is to provide a kind of area heating that helps to reasonably avoid the inspection shaft mouth shielded by the inspection shaft cover and only needs to heat the asphalt on the road surface around the inspection shaft mouth so as to avoid energy waste and avoid damage to the inspection shaft cover and The utility model is an infrared heater for heating asphalt on the pavement at the mouth of a manhole, which is beneficial to fully ignite all radiation heating mechanisms at one time to ensure safety.

The task of the present invention is accomplished in this way. An infrared heater for heating asphalt on the pavement at the mouth of a manhole includes a pair of frames that are opposite to each other and connected together in use. Each frame guard is fixed in an empty state, and a liquefied gas tank seat and an electrical control box are arranged on each rack guard. To the other end, a group of infrared radiation heating mechanisms are fixed in an arrangement next to each other, and the space between the frame shield and the infrared radiation heating mechanism constitutes an empty cavity; fixed on each frame A gas pipe on one side of the length direction and located in the empty cavity, in the middle position of the length direction of the gas pipe and facing upwards, forms a gas inlet joint connected with the control box of the electric control box, and in the gas pipe A group of gas outlet joints whose number is equal to the number of the infrared radiation heating mechanisms described above are formed at intervals in the length direction of the pipe, and a mixed gas outlet mechanism is connected to each gas outlet joint through a pipeline, and the mixed gas outlet mechanism is located in the said infrared radiation heating mechanism. Evacuate the cavity and connect with the infrared radiation heating mechanism, wherein: the position of the gas outlet joint on the gas pipe faces the mixed gas outlet mechanism, and it is characterized in that: between the pair of racks The central positions of the sides facing each other each form a semicircle relief cavity at the mouth of the inspection well, and on a pair of frames and below the corresponding group of infrared radiation heating mechanisms, a set is respectively arranged for mixing The gas lead-out mechanism leads to the secondary ignition mechanism of the mixed gas ignited by the infrared radiation heating mechanism. The secondary ignition mechanism includes the igniter fixing seat fixing plate, the igniter fixing seat, the ignition tube, the first high-voltage electronic ignition head and the second high-voltage The electronic ignition head, the fixed plate of the igniter fixed seat is fixed on one end of the frame, and the shape is L-shaped, the fixed seat of the igniter is fixed on the fixed plate of the igniter fixed seat, and one end of the ignition tube is fixed on the fixed seat of the igniter , and form an air-inducing pipe fitting threaded head at the one end, one end of an air-inducing pipe is fitted on the air-inducing pipe fitting threaded head, and the other end of the air-inducing pipe is connected with the control box of the electric control box, and the ignition pipe The other end is connected to the other end of the frame, the middle part of the ignition tube corresponds to the bottom of the group of infrared radiation heating mechanisms, and the middle part of the ignition tube is provided with an ignition tube gas injection hole in an interval state, and the first and second high pressure The electronic ignition heads correspond to each other, wherein: the middle part of the first high-voltage electronic ignition head is inserted and fixed on the ignition head fixing hole on one side of the igniter fixing seat, and is fixed by the ignition head fixing screw. The first high-voltage electronic ignition head The first ignition pin corresponds to one side of the ignition tube, and the first high-voltage wire connector of the first high-voltage electronic ignition head is connected to the electrical control box by a line, and the middle part of the second high-voltage electronic ignition head is inserted and fixed on the igniter. On the ignition head fixing hole on the other side of the seat, and also fixed by the ignition head fixing screw, the second ignition pin of the second high-voltage electronic ignition head corresponds to the other side of the ignition tube, while the second high-voltage electronic ignition head’s The second high voltage connection The head is also electrically controlled and connected with the electric control box by a circuit, wherein: the first ignition pin is electrically connected with the first high-voltage line joint, and the second ignition pin is electrically connected with the second high-voltage line joint.

In a specific embodiment of the present invention, a flying frame is respectively fixed on the two ends of the pair of racks in the length direction and on the upward side, and the rack guard includes a top guard plate and a side guard The two ends of the top guard plate are fixed with a pair of vacating frames, and the space between the top guard plate and the infrared radiation heating mechanism is formed by the vacating frame, and the liquefied gas tank seat and the electrical The control box is arranged on the top guard plate, and the side guard plate is fixed to the outer side of the frame, and the upper edge of the side guard plate is connected with the top guard plate, and the infrared ray is connected to the lower edge of the side guard plate. The windproof curtain shielded by the radiant heating mechanism, the position of the group of gas outlet joints on the gas pipe faces the mixed gas outlet mechanism, and the pipeline is a metal pipe.

In another specific embodiment of the present invention, a first universal wheel base is respectively fixed on the outer walls of the two ends of the longitudinal direction of the side of the side guard facing outward, and each first universal wheel A first universal wheel is pivotally arranged on the seat, and a second universal wheel seat is respectively fixed on a pair of short-side outer walls of the side guard plate, and a first universal wheel seat is pivotally arranged on each second universal wheel seat. Two universal wheels, and a pair of frame splicing devices for fixedly connecting or disconnecting the pair of frames are respectively provided on the outer walls corresponding to the pair of short side directions of the side guards, wherein: A positive armrest is respectively fixed on one side of the length direction of the frame, and a side armrest is respectively fixed at both ends of a pair of frame.

In yet another specific embodiment of the present invention, the rack splicing device includes a hook plate, a hook plate pivot and a locking pin, and the hook plate pivot is arranged in one of the pair of racks. On the outer wall in the short side direction of the side guard of the rack guard of one rack, the locking pin is arranged on the short side of the side guard of the rack guard of the other rack in the pair of racks On the outer wall in the direction, one end of the lock hook plate is pivotally arranged on the lock hook plate pivot, while the other end is formed as a free end and hooked with the locking pin.

In yet another specific embodiment of the present invention, the mixed gas outlet mechanism includes an air injection pipe, an air intake adjustment nut sleeve, an air mixture injection head and a liquefied gas flow control device, and one end of the air injection pipe has a nut sleeve matching thread area, a pair of air inlets and a valve seat, the nut sleeve matching thread area is formed on the outer wall of the jet pipe, and a pair of air inlets are located between the nut sleeve matching thread area and the valve seat, and the pair of air inlets correspond to each other And it communicates with the air injection pipe cavity of the air injection pipe, the valve seat is formed on the end face of the said one end of the air injection pipe, and the valve seat hole of the valve seat communicates with the air injection pipe cavity, and the intake adjustment nut sleeve is sleeved on the air injection pipe And it is threadedly matched with the threaded area of the nut sleeve. When the air intake adjustment nut sleeve rotates on the threaded area of the nut sleeve towards the direction of the valve seat, the opening degree of the air inlet decreases, and When the air intake adjustment nut sleeve rotates on the threaded area of the nut sleeve in the direction away from the valve seat, the opening degree of the air inlet increases, and one end of the mixed gas injection head is connected to the injection nozzle in a threaded fitting manner. The other end of the gas pipe and the other end of the mixed gas injection head are matched with the infrared radiation heating mechanism, and the liquefied gas flow control device is fixed with the valve seat and connected with the pipeline.

In yet another specific embodiment of the present invention, the liquefied gas flow control device includes a regulating valve body, a valve needle, a nozzle, and a valve needle pipe. The regulating valve body has a valve body fixing seat, and the valve body is fixed The seat is fixed with the valve seat, the needle pipe is set in the valve body of the regulating valve in a horizontal state, and the area between the inner wall of the valve body of the regulating valve and the outer wall of the needle pipe constitutes the cavity of the regulating valve body, and on the side of the valve body of the regulating valve A liquefied gas introduction port is extended, and the liquefied gas introduction port communicates with the regulating valve body cavity and is connected to the pipeline. One end of the regulating valve body extends a valve needle fitting, and the valve needle fitting has a regulating valve body. Screw hole, the adjusting screw hole communicates with the valve needle pipe, the other end of the valve body of the regulating valve forms a nozzle seat, one end of the nozzle is threadedly connected with the nozzle seat, and the other end penetrates into the valve seat hole, the nozzle The shape of the nozzle cavity is conical, the big end of the cone faces the nozzle seat and communicates with the regulating valve body cavity, and the small end faces the valve seat hole, and one end of the valve needle passes through the valve of the regulating screw hole and the needle tube in turn. After the needle lumen penetrates into the nozzle chamber and reaches the nozzle of the nozzle chamber, the other end of the valve needle forms an adjusting screw, which is threadedly engaged with the adjusting screw hole.

In a more specific embodiment of the present invention, the infrared radiation heating mechanism includes a top cover, a heat insulation board, an air storage frame, an air jet plate, a heating net, a lining net, a press net and a support screen frame, and the top cover A frame connection seat is fixed on the side facing the empty cavity and located at the two ends of the side, the frame connection seat is fixed to the frame, and a support net bent vertically downwards is formed around the top cover Frame positioning folds, the surroundings of the support screen frame are connected with the positioning folds of the support screen frame, the press net is placed on the support screen frame, the lining net is stacked on the press net, the heating net is stacked on the lining net, and the air jet plate is stacked On the heating net, and on the air injection plate, there are air injection holes penetrating from one side of the thickness direction of the air injection plate to the other side in a dense state. The air storage frame is stacked on the air injection plate. For the air storage chamber, the heat insulation board is stacked on the air storage frame, and the mixed gas outlet mechanism is connected with the top cover and communicated with the air storage chamber.

In a further specific embodiment of the present invention, flange connection holes are provided at intervals on the positioning flange of the supporting screen frame, each flange connecting hole is equipped with a fixing screw of the supporting screen frame, and Around the frame of the frame and in the positions corresponding to the connecting holes of the flanges, there are connection holes of the frame frame at intervals, and the fixing screws of the frame frame pass through the connection holes of the frame frame and are screwed into the frame The limit nut on the fixing screw of the screen frame is limited; the heating net is a nickel screen or a tungsten screen, and the number of layers is 5-12.

In yet another specific embodiment of the present invention, a fixing sleeve is arranged at the other end of the ignition tube, and the fixing sleeve has a fixing screw rod, and the fixing screw rod is connected with the said frame. The other end is fixedly connected.

The technical solution provided by the present invention is equipped with a secondary ignition mechanism. After the gas pipe introduces the liquefied gas into a group of mixed gas outlet mechanisms, the combustible gas mixed with air is introduced into a group of infrared radiation heating by a group of mixed gas outlet mechanisms. mechanism, so when the secondary ignition mechanism is ignited, all the infrared radiation heating mechanisms can be fully ignited at one time, which can not only ensure safety, but also ensure the effect of simultaneously heating the asphalt on the road surface; Each area is formed with a semicircle relief cavity at the mouth of the inspection well, so that the heating of the area of the inspection well cover can be avoided, energy can be saved, and damage to the inspection well cover can be avoided.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the present invention.

Fig. 2 is a three-dimensional assembly structure diagram of the mixed gas extraction mechanism shown in Fig. 1 .

Fig. 3 is a three-dimensional assembly structure diagram of the infrared radiation heating mechanism shown in Fig. 1 .

FIG. 4 is a cross-sectional view of FIG. 1 .

FIG. 5 is a structural diagram of the secondary ignition mechanism shown in FIG. 1 .

FIG. 6 is a cross-sectional view of FIG. 5 .

Fig. 7 is a schematic diagram of an application example of the present invention.

Detailed ways

In order to enable the examiners of the patent office, especially the public, to understand the technical essence and beneficial effects of the present invention more clearly, the applicant will describe in detail the following in the form of examples, but none of the descriptions to the examples is an explanation of the solutions of the present invention. Any equivalent transformation made according to the concept of the present invention which is merely formal but not substantive shall be regarded as the scope of the technical solution of the present invention.

Referring to Fig. 1, a pair of racks 1 is provided, and the sides facing each other of the pair of racks 1 are fixedly connected together in an assembled manner under the state of use, specifically, the length direction of the pair of racks 1 One side of the racks 1 is fixedly connected together in a face-to-face manner. Since the structure of a pair of racks 1 is the same, the following description is only for one of them. On the surface of the upward side of the frame 1 and at both ends, a vacant frame 15 shaped like a gantry frame is fixed, that is to say, there is a pair of vacant frames 15, and of course, the number of vacant frames 15 is not limited by a pair. The limitation can be increased according to needs, for example, it can be increased to three, so the solution of the present invention cannot be limited by changing the number of flying frames 15 . As far as this embodiment is concerned, a frame shield 11 is fixed on a pair of flying frames 15 , and the frame 1 is in a shielded state by the frame shield 11 .

The gist of the technical solution provided by the present invention: a pair of frames 1 facing each other on one side and located in the middle of the length direction of the side are each recessed to form a semicircle relief cavity 14 at the mouth of the inspection well, thereby Make the two inspection well mouths facing each other semicircle give way recesses 14 to form a whole circular cavity after matching, and this circular cavity is used for and the well known cover that is equipped with the inspection well cover on the inspection well mouth, thus makes the inspection well mouth and the inspection well asphalt pavement around the mouth. Such a structure can avoid the heating of the inspection shaft cover when heating the asphalt around the inspection shaft mouth, which can not only save energy, but also prevent the inspection shaft cover from being damaged by high temperature radiation.

The aforementioned frame cover 11 includes a top guard 111 and a side guard 112, the top guard 111 is fixed on the aforementioned pair of flying frames 15, the side guard 112 is fixed to the outward side of the frame 1, and the side guards The upper edge of the plate 112 is welded to the periphery of the top guard plate 111, and the lower edge of the side guard plate 112 shields the side of the frame 1, that is, the side guard plate 112 extends towards the direction of the floor, and the side guard plate 112 The lower edge is fixed with a windproof curtain 1121 preferably served by a high temperature resistant material such as glass fiber cloth. As shown in the figure, a liquefied gas tank seat 12 is fixed at one end of the top guard plate 111, and an electrical control box 13 is installed at the other end. A first universal wheel seat 1122 is respectively fixed on the outer wall at both ends of the long side direction of the side guard plate 112 facing outward, and a first universal wheel 11221 is pivotally arranged on each first universal wheel seat 1122 , and on a pair of short sides of the side guard plate 112 and on the outer wall, a second universal wheel seat 1123 is respectively fixed, and a second universal wheel 11231 is pivotally arranged on each second universal wheel seat 1123, thereby It can be seen that, relative to one of the racks 1 in the pair of racks 1, there are four universal wheels in total.

For ease of use, that is, to move, a front armrest 16a is respectively provided in the length direction of the outward side of the pair of frames 1, and a side armrest 16b is respectively provided at both ends of the pair of frames 1.

Shown in Fig. 1 is positioned at each two ends of a pair of racks 1 and is used for connecting a pair of racks 1 together under the state of use of the rack splicing device 6, that is to say that the rack splicing device 6 has a pair of Each frame splicing device 6 comprises a lock hook plate 61, a lock hook plate pivot 62 and a locking pin 63, and the locking pin 63 is fixed on the side guard of the frame shield 11 of one of the frame 1 in the pair of frames 1. On the outer wall of the short side of the plate 112, the locking pin 63 is fixed on one of the second universal wheel bases 1123 of a pair of second universal wheel bases 1123 in this embodiment, and the lock hook plate pivot 62 is fixed on the On the outer wall of the short side of the side guard plate 112 of the frame shield 11 of another frame 1 in a pair of frames 1, in the present embodiment, the locking hook plate pivot 62 is fixed on a pair of second ten thousand. On another second universal wheel base 1123 in the wheel base 1123, one end of the lock hook plate 61 is rotatably arranged on the lock hook plate pivot 62, and the other end of the lock hook plate 62 forms a lock hook plate notch. 611 , the notch 611 of the locking hook plate is hooked, that is, buckled on the locking pin 63 .

When the present invention arrives at the construction site, as long as a pair of frame 1 is put together by the state shown in Fig. One end of the notch 611 is rotated toward the locking pin 63 until the locking hook plate notch 611 cooperates with the locking pin 63, thereby assembling the pair of frames 1 into a whole, and vice versa.

On the aforesaid pair of frames 1 and from one end to the other end of the length direction of the frame 1, a group of infrared radiation heating mechanisms 4 are respectively fixed in a splicing mode next to each other. In this embodiment, although in the figure 1 shows that the number of one group of infrared radiation heating mechanisms 4 is four, but obviously the present invention should not be limited by this number. Because one group of infrared radiation heating mechanism 4 is positioned at the bottom of frame 1, exactly corresponding to the below of frame shield 11, so keep space between frame shield 11 and one group of infrared radiation heating mechanism 4, by This space is formed as an empty chamber 113 . As mentioned above, due to the middle part of the longitudinal direction of the sides of a pair of frames 1 facing each other and each forming a semicircle relief cavity 14 at the position corresponding to each other, in a group of infrared radiation heating mechanisms 4, the corresponding The shape of the infrared radiation heating mechanism 4 at the semicircle relief cavity 14 at the inspection well mouth should meet the degree of adapting to the semicircle relief cavity 14 at the inspection well mouth according to common sense. Therefore, a group of infrared radiation heating mechanisms are shown in the figure. Two infrared radiation heating mechanisms 4 located in the middle of 4 are designed in an arc shape towards the end of the semicircle recess 14 at the mouth of the manhole.

A gas pipe 2 is arranged in the frame shield 11 on each frame 1, and one side of the length direction of the gas pipe 2 and the frame 1 is the long side with the frame 1 and has the first universal wheel base 1122 One side of the side guard plate 112 is fixed, and a gas inlet connector 21 is formed in the middle of the length direction of the gas pipe 2. The gas inlet connector 21 is controlled and connected with the electrical control box 13 by the gas supply pipe 211 (shown in FIG. 7 ), and In the length direction of the gas pipe 2, a group of gas outlet joints 22 corresponding to the upper part of the infrared radiation heating mechanism 4 are formed at intervals. Undoubtedly, each infrared radiation heating mechanism 4 corresponds to a gas outlet joint 22 . Each gas outlet joint 22 is connected with a mixed gas outlet mechanism 3 through the pipeline 221 of the gas outlet joint 22. In order to facilitate the gas outlet joint 22 to be conveniently matched with the mixed gas outlet mechanism 3, the gas outlet joint The position or direction of 22 on the gas pipe 2 is towards the side of the mixed gas outlet mechanism 3, while the gas inlet joint 21 is located on the upward side of the gas pipe 2. Preferably, the pipeline 221 uses metal pipes, but non-metal pipes can also be used. Each mixed gas extraction mechanism 3 extends to the infrared radiation heating mechanism 4 and is connected with the infrared radiation heating mechanism 4. As shown in the figure, the number of a group of mixed gas extraction mechanisms 3 is equal to the number of a group of infrared radiation heating mechanisms 4, namely There are also four.

Please refer to Fig. 2 and in conjunction with Fig. 1, a group of mixed gas outlet mechanisms 3 each include an air injection pipe 31, an air intake adjustment nut sleeve 32, a mixed air injection nozzle 33 and a liquefied gas flow control device 34, and one end of the air injection pipe 31 faces the aforementioned One end of the gas outlet joint 22 is formed with a nut sleeve matching threaded area 311, a pair of air inlets 312 and a valve seat 313. The nut sleeve matching threaded area 311 is formed on the outer wall of the jet pipe 31, and a pair of air inlets 312 are located on the nut. The sleeve fits between the threaded area 311 and the valve seat 313, and the pair of air inlets 312 maintain a corresponding state of facing each other. There is a valve seat hole 3131 in the center of the valve seat 3131, which communicates with the air injection pipe cavity 314 of the air injection pipe 31, and a group (four shown in FIG. 2 ) of connecting screw holes 3132 is arranged on the valve seat 313 . The air intake adjusting nut sleeve 32 is sleeved on the jet pipe 31 , and an internal thread 321 is processed on its inner wall, and the internal thread 321 is threadedly engaged with the aforementioned nut sleeve mating threaded area 311 . Because the function of a pair of air inlets 312 is to introduce outside air, and form a mixed gas by mixing the outside air with liquefied gas, the degree of opening and closing of a pair of air inlets 312, that is, the degree of opening, is controlled by the air inlet adjusting nut. The sleeve 32 is in charge, for example (taking the position shown in the current figure as an example): when the air intake adjustment nut sleeve 32 is rotated counterclockwise, it will be displaced toward the valve seat 313, so that the intake air adjustment nut sleeve 32 is opposite to the intake air. The sealing degree of the port 312 increases, and the intake of outside air decreases. On the contrary, when the intake adjustment nut sleeve 32 rotates clockwise, it moves away from the valve seat 313, and the opening degree of the pair of intake ports 312 or It is said that the degree of exposure increases, and the ingress of outside air increases. Therefore, reasonable adjustment of the intake adjustment nut sleeve 32 can obtain an ideal mixed gas with a reasonable combustion effect. Preferably, a positioning hole 322 can also be set on the air intake adjusting nut sleeve 32, and a positioning screw 3221 is provided on the positioning hole 322, when the air intake adjusting nut sleeve 32 is adjusted to the required degree according to the above description Then tighten the set screw 3221 to limit the air intake adjustment nut sleeve 32 . One end of the mixed gas nozzle 33 is matched with the thread of the other end of the gas injection pipe 31, and the other end of the mixed gas nozzle is connected with an end of a connecting pipe section 331, and the other end of the connecting pipe section 331 has a connecting seat 3311, and the connecting seat 3311 Cooperate with the infrared radiation heating mechanism 4 mentioned above and described in detail below. The preferred but not absolutely limited structure of the liquefied gas flow control device 4 is as follows: it includes a regulating valve body 341, a valve needle 342, a nozzle 343, and a valve needle pipe 344. Seat 3411, on the valve body fixing seat 3411 and at a position corresponding to the aforementioned connecting screw hole 3132, a group of through holes 34111 equal in number to the connecting screw hole 3132 are opened, and the connecting screw 34112 is screwed into the connecting screw through the through hole 34111 The valve body fixing seat 3411 and the valve seat 313 are fixed through the hole 3132 . The valve needle tube 344 is arranged in the regulating valve body 341 in a horizontal state, and the gap between the inner wall of the regulating valve body 341 and the outer wall of the valve needle pipe 344, that is, the area, constitutes the regulating valve body cavity 3412, that is to say, the entire valve needle tube 344 is The horizontal state is located within the regulator valve body cavity 3412 . There is a liquefied gas introduction port 3413 extending on the side of the regulating valve body 341, the liquefied gas introducing port 3413 communicates with the aforementioned regulating valve body cavity 3412, and is connected with the aforementioned pipeline 221, through the liquefied gas introducing port 3413 The liquefied gas from the pipeline 221 is introduced into the regulating valve body chamber 3412 . A needle fitting 3414 is extended from one end of the regulating valve body 341, the needle fitting 3414 has an adjusting screw hole 34141, the adjusting screw hole 34141 communicates with the aforementioned needle pipe 344, the other end of the regulating valve body 341 A nozzle seat 3415 is formed, and the inner wall of the nozzle seat 3415 is formed with a nozzle matching internal thread hole 34151 . The outer wall of one end of the nozzle 343 is formed with a nozzle matching external thread 3432, and the nozzle matching external thread 3432 is threadedly matched with the nozzle matching internal thread 34151, so that the nozzle 343 and the nozzle seat 3145 are fixed, and the other end of the nozzle 343 is inserted into the Or it is inserted into the aforementioned valve seat hole 3131 . As shown in Figure 2, the shape of the nozzle cavity 3431 of the nozzle 343 is formed as a tapered cavity with a large diameter at one end and a small diameter at the other end. The valve body cavity 342 communicates with each other, and the small head end, that is, the end with a small diameter, faces the valve seat hole 3131 . One end of the valve needle 342 protrudes into the aforementioned nozzle chamber 3431 after passing through the adjusting screw hole 34141 and the valve needle lumen of the valve needle pipe 344 in sequence, and reaches the position of the nozzle 34311 of the nozzle chamber 3431. The other end of the valve needle 342 constitutes There is an adjusting screw 3421, and the adjusting screw 3421 is threadedly engaged with the aforementioned adjusting screw hole 34141. Preferably, a protective cap thread 34142 is provided on the outer wall of the aforementioned valve needle fitting 3414 , and a protective cap 345 for shielding the adjusting screw 3421 is arranged on the protective cap thread 34142 .

In the state of unscrewing and removing the protective cap 345, adjust the adjusting screw 3421 with a tool such as a screwdriver (screwdriver), so that the position of the valve needle 342 at the nozzle 34311 of the nozzle chamber 3431 can be changed. Specifically, the more the valve needle 342 is displaced toward the nozzle 34311, the flow rate of the liquefied gas, that is, the gas, from the nozzle 34311 becomes smaller, and vice versa.

See also Fig. 3 and Fig. 4, have provided in this figure and be positioned at below one of frame 1 in a pair of frame 1 and all fix with frame 1 a group of infrared radiation heating mechanism 4 (present embodiment for four). According to common sense, since there is a pair of frame 1, there are two groups of infrared radiation heating mechanisms 4, and since each group has four, there are eight in total, and because the structure of each infrared radiation heating mechanism 4 is the same, the applicant Only one is described in detail below.

The structure of the preferred but not absolutely limited infrared radiation heating mechanism 4 is as follows: comprise top cover 41, heat shield 42, air storage frame 43, air injection plate 44, heating net 45, lining net 46, pressure net 47 and support screen frame 48 The top cover 41 faces the surface on one side of the aforementioned evacuation chamber 113 and is positioned at both ends of the surface on this side. A cross-sectional shape is an L-shaped frame connecting seat 411 of an English letter. Each frame connecting seat A set of fixed connection holes 4111 are provided in a spaced state on the 411, and the frame connection base 411 is fixedly connected to the corresponding two sides of the length direction of the frame 1 by means of the fixed connection holes 4111 and by means of fixing screws (as shown in Figure 1). Around the cover 41, there are vertical downward bending frame positioning flanges 412, and on the frame positioning flanges 412, there are flange connection holes 4121 at intervals, and on each flange connection hole 4121 Be equipped with support screen frame fixing screws 41211, and each support screen frame fixing screw 41211 is also equipped with limiting nuts 41212. The surroundings of the supporting net frame 48 are connected with the positioning flaps 412 of the supporting net frame, specifically: around the supporting net frame 48 and at positions corresponding to the folding connecting holes 4121, there are a number of holes equal to the number of the folding connecting holes 412. Tray net frame connection hole 481. After the support screen frame 48 corresponds to the inside of the top cover 41, that is, corresponds to the inside of the support screen frame positioning flange 412, the aforementioned support screen frame fixing screws 41211 are inserted from the flange connection hole 4121 and the support screen frame connection hole 481 in sequence, And it is limited by the limit nut 41212, thereby the bracket frame positioning flange 412 of the bracket frame 48 and the top cover 41 is fixed. The pressing net 47 rests on the upward facing side of the supporting screen frame 48, the lining net 41 is stacked on the pressing net 47, and the heating net 45 is stacked on the lining net 46. The heating net 45 can also be called a heat radiation net. It is preferably composed of 5-12 layers of nickel wire or tungsten wire braided mesh. The air jet plate 44 rests on the heating net 45, and the air jet plate 44 is formed in a dense form from the thickness direction of the air jet plate 44. One side of the air storage frame 43 is stacked on the air injection plate 44, and the middle area of the air storage frame 43 or the area in the frame is formed as an air storage cavity 431. The heat insulation plate 42 Stacked on the air storage frame 43, the mixed gas injection head 33 of the aforementioned mixed gas extraction mechanism 3 is matched with the connection seat relief hole 413 on the top cover 41, more precisely, the connecting pipe section of the mixed gas injection head 33 The connection seat 3311 on the connection seat 331 is matched with the connection seat relief hole 413 , and the connection pipe section 331 communicates with the aforementioned air storage chamber 431 after passing through the heat shield 42 .

Please refer to Fig. 5 and Fig. 6 and still in conjunction with Fig. 1, since the structure of a pair of secondary ignition mechanisms 5 below each group of infrared radiation heating mechanisms 4 corresponding to a pair of racks 1 is exactly the same, the applicant Only one is described in detail below.

The preferred but not absolutely limited structure of the secondary ignition mechanism 5 is as follows: comprising an igniter fixing seat fixing plate 51, an igniter fixing seat 52, an ignition tube 53, a first high-voltage electronic ignition head 54 and a second high-voltage electronic ignition head 55, The overall shape of the igniter fixing seat fixing plate 51 is an L-shape of an English letter (shown in Figure 1), and is fixed to one end of the frame 1 with a fixing plate screw 511, and the igniter fixing seat 52 is fixed with the igniter fixing screw 521 shown in the figure. Fixed with the igniter holder fixing plate 51, one end of the ignition tube 53 is fixed on the igniter holder 52 and also protrudes from the igniter holder 52, and one end of the ignition tube 53 protrudes from the igniter holder 52 to form a The air-introduction pipe is connected with the threaded head 534, and one end of the air-induction pipe 531 (shown in FIG. 7 ) is connected to the air-induction pipe with the threaded head 534, and the other end of the air-induction pipe 531 is connected with the aforementioned electric control box 13 for control, and the ignition pipe 53 The other end is provided with a fixed sleeve 532, the fixed sleeve 532 has a fixed screw rod 5321, the fixed screw rod 5321 is fixed with the other end of the frame 1, the middle part of the ignition tube 53 corresponds to the bottom of the aforementioned group of infrared radiation heating mechanisms 4, In addition, air injection holes 533 are opened at intervals. The first and second high-voltage electronic ignition heads 54 and 55 are correspondingly inserted into each ignition head fixing hole 522 preset on both sides of the igniter fixing seat 52, and each is provided on the igniter fixing seat 522. The ignition head fixing screw 523 on the top is supported and fixed, wherein: the first high-voltage electronic ignition head 54 is located on one side of the igniter fixing seat 52, and the first ignition pin 541 of the first high-voltage electronic ignition head 54 corresponds to one of the ignition tubes 53. side, and the first high-voltage line connector 542 of the first high-voltage electronic ignition head 54 is electrically connected to the electrical control box 13 by a line, and the second high-voltage electronic ignition head 55 is fixed on the other side of the igniter fixing seat 52. The second high-voltage The second ignition needle 551 of the electronic ignition head 55 corresponds to the other side of the ignition tube 53 , and the second high-voltage wire connector 552 of the second high-voltage electronic ignition head 55 is also connected electrically to the electrical control box 13 by a circuit. According to common sense, the first ignition pin 541 is electrically connected to the first high voltage wire connector 542 , and the second ignition pin 551 is electrically connected to the second high voltage wire connector 552 .

In the aforesaid electrical control box 13, the air supply pipe electromagnetic valve for controlling the air supply pipe 211, the air induction pipe solenoid valve for controlling the air introduction pipe 531, and the circuit for controlling the connection with the first and second pressure line joints 542, 552 are installed. Connected ignition switch. The power supply of the electrical control box 13 is preferably a solar photovoltaic module, specifically: a solar photovoltaic power generation module can be arranged on the top guard plate 111 of the frame shield 11 .

Referring to Fig. 7 and in conjunction with Fig. 1 to Fig. 6, a liquefied gas storage tank 7 is respectively arranged on the liquefied gas tank seat 12 of the top guard plate 111 of the frame shield 11 of a pair of racks 1, and the liquefied gas storage tank 7 The gas output pipe drawn from the pressure reducing valve of 7 is introduced into the electrical control box 13 from the transition hole 131 (shown in FIG. 1 ) on the electrical control box 13 and connected with the aforementioned air supply pipe solenoid valve and air induction pipe solenoid valve.

When the present invention is transported to the construction site, a pair of frames 1 are put together by the aforementioned frame splicing device 6, that is, the state shown in Fig. The cavity 14 corresponds to the location of the manhole cover on the construction site. The operator operates the corresponding operation button 132 on the electrical control box 13, for example, when the valve on the liquefied gas storage tank 7 is opened, the air supply pipe electromagnetic valve used to control the air supply pipe 211 is first opened, and the air supply pipe 211 will The liquefied gas is led to the gas inlet joint 21 of the gas pipe 2, and the liquefied gas entering the gas pipe lumen of the gas pipe 2 is introduced into the liquefied gas of the mixed gas outlet mechanism shown in Figure 2 through the gas outlet joint 22 and the pipeline 221 The flow control device 34, the liquefied gas entering the regulating valve body cavity 3412 of the regulating valve valve body 341 of the liquefied gas flow control device 34 is sprayed into the valve seat hole 3131 of the valve seat 313 from the nozzle 34311 of the nozzle chamber 3431 of the nozzle 343, and comes out The liquefied gas in the valve seat hole 3131 mixes with the outside air from the air inlet 312 to form a mixed gas and enters the air injection cavity 314 of the air injection tube 31, and the mixed gas in the air injection cavity 314 passes through the mixed gas injection head 33 and the connecting pipe section 331 is sprayed into the gas storage cavity 431 of the gas storage frame 43 of the infrared radiation heating mechanism 4, and the mixed gas entering the gas storage cavity 431 diffuses to the heating net 45 through the gas injection holes 441 on the gas injection plate 44. Because the ignition tube 53 of the secondary ignition mechanism 5 corresponds to the bottom of a group of infrared radiation heating mechanisms 4, when the above-mentioned gas supply to the gas pipe 2, the gas supply for the ignition tube 53 is opened by the operation of the electric control box 13 The gas supply solenoid valve and the air-inducing pipe 531 lead the liquefied gas into the ignition pipe 531 , and the liquefied gas entering the ignition pipe 531 is sprayed out from the gas injection hole 5331 of the ignition pipe. At this time, the high-voltage ignition switch is turned on by operating the electrical control box 13, so that the first and second ignition pins 541, 551 emit high-voltage sparks, thereby igniting the liquefied gas from the ignition jet hole 533. In this state, the middle area of the whole ignition tube 53 (the area with the ignition tube jet hole 533) forms a lengthy fire bundle or a fire zone corresponding to a group of infrared radiation heating mechanisms 4, which is formed by the lengthy The flame beam ignites the gas mixture coming out of the gas injection holes 441 of the gas injection plate 44 . Cut off the ignition circuit after the secondary ignition is completed. In this state, the asphalt on the road surface is heated and softened by the heating net 45, so as to repair and lay the asphalt. For this, refer to paragraphs 0025-0026 of the description of CN101718073A.

In summary, the technical solution provided by the present invention overcomes the deficiencies in the prior art, completes the task of the invention, and objectively embodies the technical effects described by the applicant in the above technical effect column.

Claims (9)

1. An infrared heater for heating asphalt at the mouth of a manhole, comprising a pair of frames (1) opposite to each other and connected together in use, with the same structure, on the pair of frames (1) A frame shield (11) is respectively fixed in the empty state, and a liquefied gas tank seat (12) and an electric control box (13) are arranged on each frame shield (11). The lower side and from one end to the other end of the length direction of the frame (1) are respectively fixed with a group of infrared radiation heating mechanisms (4) in an arrangement next to each other, and the frame shield (11 ) and the space between the infrared radiation heating mechanism (4) constitutes an empty chamber (113); The pipe (2), in the middle position of the length direction of the gas pipe (2) and facing upwards, forms a gas inlet joint (21) connected with the control of the electric control box (13), while the gas pipe (2) The length direction of the gas outlet joint (22) is formed with a group of gas outlet joints (22) equal to the number of the infrared radiation heating mechanism (4) at intervals, and a mixing tube (22) is connected to each gas outlet joint (22) The gas outlet mechanism (3), the mixed gas outlet mechanism (3) is located in the empty cavity (113) and connected with the infrared radiation heating mechanism (4), wherein: the gas outlet joint (22) is in the The position on the gas pipe (2) faces the mixed gas drawing-out mechanism (3), and it is characterized in that: a semicircle at the mouth of the inspection well is formed at the middle position of the sides of the pair of racks (1) facing each other. Make way for the concave cavity (14), and on the pair of frames (1) and below the corresponding group of infrared radiation heating mechanisms (4), each is provided with a mechanism for drawing the mixed gas out (3 ) leads to the secondary ignition mechanism (5) ignited by the mixture gas of the infrared radiation heating mechanism (4), and the secondary ignition mechanism (5) includes an igniter fixing seat fixing plate (51), an igniter fixing seat (52), The ignition tube (53), the first high-voltage electronic ignition head (54) and the second high-voltage electronic ignition head (55), the igniter holder fixing plate (51) is fixed on one end of the frame (1), and the shape is L-shaped, the igniter fixing seat (52) is fixed on the igniter fixing seat fixing plate (51), and one end of the ignition tube (53) is fixed on the igniter fixing seat (52), and a bleed air pipe is formed at this end. Connect the threaded head (534), on the air-introduced pipe fitting threaded head (534), one end of an air-introduced pipe (531) is fitted, and the other end of the air-introduced pipe (531) is controlled with the electric control box (13) connection, the other end of the ignition tube (53) is connected with the other end of the frame (1), the middle part of the ignition tube (53) corresponds to the below of the group of infrared radiation heating mechanisms (4), and the ignition tube ( The middle part of 53) is provided with an ignition pipe jet hole (533) with an interval state, and the first and second high-voltage electronic ignition heads ( 54, 55) correspond to each other, wherein: the middle part of the first high-voltage electronic ignition head (54) is inserted and fixed on the ignition head fixing hole (522) on one side of the igniter fixing seat (52), and the ignition head is fixed by the screw (523) is fixed, and the first ignition needle (541) of this first high-voltage electronic ignition head (54) corresponds to one side of the ignition tube (53), and the first high-voltage line connector (54) of the first high-voltage electronic ignition head (54) 542) is electrically controlled by the circuit and the electric control box (13), and the middle part of the second high-voltage electronic ignition head (55) is inserted and fixed on the ignition head fixing hole (522) on the other side of the igniter fixing seat (52) , and is also fixed by the ignition head fixing screw (523), the second ignition needle (551) of the second high-voltage electronic ignition head (55) corresponds to the other side of the ignition tube (53), and the second high-voltage electronic ignition head The second high-voltage line connector (552) of (55) is also electrically controlled by the circuit and the electric control box (13), wherein: the first ignition pin (541) is electrically connected with the first high-voltage line connector (542), and the second ignition pin (551) is electrically connected to the second high-voltage line connector (552). 2. The infrared heater for heating asphalt at the mouth of a manhole according to claim 1, characterized in that an empty frame is respectively fixed on the two ends of the length direction of the pair of frames (1) and on the upward side (15), the frame guard (11) includes a top guard (111) and a side guard (112), and the two ends of the top guard (111) are fixed with a pair of flying frames (15), by Empty the frame (15) so that the space between the top guard plate (111) and the infrared radiation heating mechanism (4) constitutes the vacated chamber (113), the liquefied gas tank seat (12) and the electrical control box (13) be arranged on the top guard plate (111), the side guard plate (112) is fixed to the side facing outward of the frame (1), and the upper edge of the side guard plate (112) is connected with the top guard plate (111), A windproof curtain (1121) for shielding the infrared radiation heating mechanism (4) is connected to the lower edge of the side guard (112), and the set of gas outlet joints (22) in the gas pipe The position on (2) faces the mixed gas outlet mechanism (3), and the pipeline (221) is a metal pipe. 3. The infrared heater for heating asphalt at the mouth of a manhole according to claim 2, wherein an infrared heater is respectively fixed on the outer walls of the two ends of the longitudinal direction of the side of the side guard plate (112) facing outwards. The first universal wheel seat (1122), on each first universal wheel seat (1122), a first universal wheel (11221) is pivotally arranged, and in the direction of a pair of short sides of the side guard plate (112) A second universal wheel seat (1123) is respectively fixed on the outer wall, and a second universal wheel (11231) is pivotally arranged on each second universal wheel seat (1123), and a second universal wheel (11231) is arranged on the corresponding side guard plate (112) A pair of frame splicing devices (6) for fixedly connecting or disconnecting the pair of frames (1) are respectively provided on the outer walls of the pair of short sides, wherein: between the pair of frames (1) A positive handrail (16a) is respectively fixed on one side in the length direction, and a side handrail (16b) is respectively fixed at both ends of a pair of frame (1). 4. The infrared heater for heating asphalt at the mouth of a manhole according to claim 3, characterized in that said frame splicing device (6) comprises a lock hook plate (61), a lock hook plate pivot (62) and The locking pin (63), the locking hook plate pivot (62) is arranged on the side guard plate ( 112) on the outer wall of the short side direction, the locking pin (63) is arranged on the side guard plate (112) of the frame shield (11) of the other frame (1) in the pair of frames (1) On the outer wall of the short side direction of the lock hook plate (61), one end pivot of the lock hook plate (61) is arranged on the lock hook plate pivot (62), while the other end constitutes a free end and is hooked with the locking pin (63). 5. The infrared heater for heating asphalt at the mouth of a manhole according to claim 2, characterized in that the mixed gas drawing-out mechanism (3) comprises an air injection pipe (31), an intake adjustment nut sleeve (32), a mixing Gas injection nozzle (33) and liquefied gas flow control device (34), one end of the injection pipe (31) has a nut sleeve matching threaded area (311), a pair of air inlets (312) and a valve seat (313), The nut sleeve matching threaded area (311) is formed on the outer wall of the jet pipe (31), and a pair of air inlets (312) are located between the nut sleeve matching threaded area (311) and the valve seat (313). The mouths (312) correspond to each other and communicate with the gas jet cavity (314) of the gas jet tube (31), the valve seat (313) is formed on the end face of the said one end of the gas jet tube (31), and the valve seat (313) The valve seat hole (3131) communicates with the air injection pipe cavity (314), and the air intake adjustment nut sleeve (32) is sleeved on the air injection pipe (31) and threaded with the threaded area (311) of the nut sleeve. When the adjusting nut sleeve (32) rotates toward the valve seat (313) on the nut sleeve mating threaded area (311), the opening degree of the air inlet (312) decreases, and when When the air intake adjustment nut sleeve (32) rotates on the nut sleeve mating threaded area (311) toward the direction away from the valve seat (313), the opening degree of the air inlet (312) increases, and the mixed gas jet One end of the head (33) is connected to the other end of the gas injection pipe (31) in a threaded fitting manner, and the other end of the mixed gas injection head (33) is matched with the infrared radiation heating mechanism (4), and the flow rate of the liquefied gas is controlled. The device (34) is fixed to the valve seat (313) and connected to the pipeline (221). 6. The infrared heater for heating asphalt at the mouth of a manhole according to claim 5, characterized in that the liquefied gas flow control device (34) comprises a regulating valve body (341), a valve needle (342), a nozzle (343) and the valve needle tube (344), the regulating valve body (341) has a valve body fixing seat (3411), and the valve body fixing seat (3411) is fixed with the valve seat (313), and the valve needle tube (344 ) is arranged in the regulating valve body (341) in a horizontal state, and the area between the inner wall of the regulating valve body (341) and the outer wall of the needle tube (344) constitutes the regulating valve body cavity (3412). A liquefied gas introduction port (3413) extends from the side of (341), and the liquefied gas introduction port (3413) communicates with the regulating valve body cavity (3412) and is connected with the pipeline (221). One end of the body (341) is extended with a valve needle fitting (3414), the valve needle fitting (3414) has an adjusting screw hole (34141), and the adjusting screw hole (34141) communicates with the valve needle pipe (344) to adjust The other end of the valve body (341) forms a nozzle seat (3415), one end of the nozzle (343) is threadedly connected with the nozzle seat (3415), and the other end penetrates into the valve seat hole (3131), the nozzle The shape of the nozzle cavity (3431) of (343) is conical, and the big end of the cone faces the nozzle seat (3415) and communicates with the regulating valve body cavity (3412), while the small end faces the valve seat hole (3131) One end of the valve needle (342) protrudes into the nozzle cavity (3431) after passing through the adjusting screw hole (34141) and the valve needle lumen of the valve needle tube (344) in sequence and reaches the nozzle (34311) of the nozzle cavity (3431) ), the other end of the valve needle (342) forms an adjusting screw (3421), and the adjusting screw (3421) is threadedly engaged with the adjusting screw hole (34141). 7. The infrared heater for heating asphalt at the mouth of a manhole according to claim 2, characterized in that said infrared radiation heating mechanism (4) comprises a top cover (41), a heat shield (42), and an air storage frame (43), jet plate (44), heating net (45), liner net (46), pressure net (47) and support net frame (48), top cover (41) is towards one of described vacated cavity (113) The two ends of the side and the side are respectively fixed with a frame connection seat (411), the frame connection seat (411) is fixed with the frame (1), and the top cover (41) is surrounded by a vertical downward Bending support screen frame location flanging (412), the surrounding of support screen frame (48) is connected with described support screen frame positioning flange (412), press net (47) is shelved on the support screen frame (48), The backing net (46) is superimposed on the press net (47), the heating net (45) is superimposed on the backing net (46), the air injection plate (44) is superimposed on the heating net (45), and on the air jet plate ( 44) is densely formed with air injection holes (441) penetrating from one side of the air injection plate (44) in the thickness direction to the other side, and the air storage frame (43) is stacked on the air injection plate (44). The central area of the air frame (43) is formed as an air storage chamber (431), and the heat shield (42) is stacked on the air storage frame (43), and the mixed gas outlet mechanism (3) and the top cover ( 41) is connected and communicated with the air storage cavity (431). 8. The infrared heater for heating asphalt at the mouth of a manhole according to claim 7, characterized in that the positioning flange (412) of the supporting screen frame is provided with flange connecting holes (4121) in an interval state, On each flanging connecting hole (4121) is equipped with the frame fixing screw (41211), around the frame (48) and at the position corresponding to the flanging connecting hole (4121) in a spaced state Open the supporting screen frame connecting hole (481), the supporting screen frame fixing screw (41211) passes through the supporting screen frame connecting hole (481) and is screwed on the limiting nut (41211) on the supporting screen frame fixing screw (41211) 41212) limit; the heating net (45) is a nickel screen or a tungsten screen, and the number of layers is 5-12 layers. 9. The infrared heater for heating asphalt at the mouth of a manhole according to claim 1, characterized in that a fixed sleeve (532) is provided at the other end of the ignition tube (53), and the fixed sleeve ( 532) has a fixing screw (5321), and the fixing screw (5321) is fixedly connected with the other end of the frame (1) .