CN111468875A - Feeding device and circumference welding machine - Google Patents

Abstract

The invention provides a feeding device and a circumferential welding machine, which solves the problem of low work efficiency in manually placing the heat sink on the machining material level of the circumferential welding machine. The feeding device includes a waiting level, a clamping mechanism and a pushing mechanism. The clamping mechanism is used to clamp or release the workpiece; the pushing mechanism is connected with the clamping mechanism and can drive the clamping mechanism between the waiting level and the processing material level. A movable setting, so that after the clamping mechanism clamps the workpiece on the material level, the pushing mechanism moves the clamping mechanism to the processing material level, and after the clamping mechanism releases the workpiece on the processing material level, the pushing mechanism will clamp the workpiece. The material mechanism is transported to the waiting material position to continue to clamp another workpiece; the circumferential welding machine includes the processing material position and the above-mentioned feeding device; the employee only needs to place the heat sink on the waiting material position, which can realize one person and multiple machines without the need for Wait until the circular machine completes the welding of the last heat sink and the welding head returns to its original position, and then discharges the material on the processing material level, reducing the standby time and improving the feeding and processing efficiency.

Description

Feeding device and circular welding machine

technical field

The invention relates to the technical field of heat sink processing, in particular to a feeding device and a circumferential welding machine.

Background technique

At present, when using the circular machine for the production of electric heating oil, due to the limitation of equipment operation time and site, it is necessary to manually place the heat sink directly on the processing material level of the circular machine. The circular machine senses that the heat sink is in place, and the welding head begins action to start the welding process.

The applicant found that the prior art has at least the following technical problems: the existing feeding process is to manually place the heat sink directly on the processing material level, and the welding of the last heat sink must be completed on a circumferential welding machine during feeding, and the welding machine When the head is restored to its original position, the employee can put the next fin on the processing material level, and there is a waiting time for the reset of the circumferential welding machine. Once the production continuity is accidentally interrupted and the heat sink cannot be placed in place in time, the circular machine will wait for the heat sink, which will affect the production efficiency. In addition, the operation reliability of manual feeding is low, and each employee can only feed at most 2 circular machines, so the feeding efficiency is low.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a feeding device and a circumferential welding machine, so as to solve the technical problem in the prior art that the heat sink is manually placed on the processing material level of the circumferential welding machine and the working efficiency is low; many technical solutions provided by the present invention. The many technical effects that can be produced by the preferred technical solutions in the above are described in detail below.

For achieving the above object, the invention provides the following technical solutions:

The feeding device provided by the present invention includes a waiting level, a clamping mechanism and a pushing mechanism, wherein:

The clamping mechanism is used for clamping or releasing the workpiece;

The pushing mechanism is connected with the clamping mechanism and drives the clamping mechanism to be movable between the waiting material level and the processing material level, so as to clamp the material clamping mechanism on the waiting material level After the workpiece is removed, the pushing mechanism moves the clamping mechanism to the processing material level, and after the clamping mechanism releases the workpiece at the processing material level, the pushing mechanism pushes the clamping mechanism It is transported to the waiting position to continue to grip another workpiece.

Preferably, the clamping mechanism includes a plurality of clamping cylinders and clamping parts arranged on the telescopic ends of the clamping cylinders, and clamping parts for clamping the workpiece are formed between all the clamping parts Space, the clamping part can be adjusted in multiple directions under the expansion and contraction of the clamping cylinder, so that the clamping part can clamp or release the workpiece.

Preferably, the clamping mechanism includes at least two clamping cylinders and baffles arranged opposite to each other, the baffles are arranged on the telescopic ends of the clamping cylinders, and the baffles are at least arranged on the side of the workpiece. On the opposite sides, the clamping cylinder can push the baffles on it to move back to release the workpiece, or drive the baffles on it to move toward each other to clamp the workpiece.

Preferably, the baffles are arranged on opposite sides of the workpiece along the width direction of the workpiece.

Preferably, all the clamping cylinders are arranged horizontally and their upper ends are formed with a bearing surface for supporting the workpiece, and the level of the bearing surface can be equal to or higher than the level of the processing material level.

Preferably, the pushing mechanism includes a driving mechanism, the driving mechanism and the clamping mechanism are connected by a connecting plate, the connecting plate is arranged at the lower part of the processing material level, and the connecting plate can When the driving mechanism extends and retracts, the clamping mechanism is driven to move between the waiting material level and the processing material level.

Preferably, the feeding device further includes a lifting mechanism, which is connected to the pushing mechanism and used to drive the pushing mechanism to ascend or descend in a vertical direction.

Preferably, the lifting mechanism includes a lifting cylinder, the lifting cylinder is arranged vertically and is connected to the pushing mechanism through a mounting plate, and the clamping mechanism can clamp the workpiece when the extension end of the lifting cylinder rises It is held and fixed at a level equal to or higher than the processing material level; when the extension end of the lifting cylinder descends, the upper edge of the clamping mechanism can be lowered below the processing material level.

Preferably, the number of the lifting cylinders is two, and the two lifting cylinders are arranged on opposite sides of the pushing mechanism.

Preferably, the clamping mechanism is provided with a photoelectric sensor, the photoelectric sensor is connected with a controller, the controller is connected with the clamping cylinder, and the photoelectric sensor is used for detecting the baffle between the When the workpiece is clamped, an electric signal is sent to the controller to trigger the controller to control the clamping cylinder to shrink and clamp the workpiece when the electric signal is received.

The invention also provides a circumferential welding machine, which includes a processing material level and the above-mentioned feeding device, and the feeding device is used for feeding the heat sink.

Compared with the prior art, the present invention has the following beneficial effects:

1. With the feeding device provided by the present invention, the employee only needs to place the heat sink on the waiting position of the circumferential welding machine. After the clamping mechanism clamps the workpiece on the waiting position, the push mechanism can move the clamping mechanism to the circumference of the welding machine. At the processing material level of the machine, and after the clamping mechanism releases the workpiece on the processing material level, the push mechanism transports the clamping mechanism to the waiting material level to continue to clamp another workpiece; the entire feeding process, the staff only needs to wait The heat sink can be placed on the material level, which can realize multiple machines by one person. It is not necessary to directly place the heat sink on the processing material level. Then, the material is discharged at the processing material level to reduce the standby time and improve the feeding efficiency and processing efficiency of the heat sink.

2. Since the circumferential welding machine provided by the present invention is equipped with the above-mentioned feeding device, the employee only needs to place the heat sink on the waiting material position, which can realize multiple machines by one person, and it is not necessary to wait for the circumferential machine to complete the welding of the last heat sink and The welding head returns to its original position and then discharges the material at the processing material level, which reduces the standby time and improves the feeding efficiency and processing efficiency of the heat sink.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the overall structure schematic diagram of the feeding device of the present invention;

Fig. 2 is the front view structure schematic diagram of the feeding device;

Fig. 3 is the side view structure schematic diagram of the feeding device;

4 is a schematic structural diagram of the clamping mechanism of the feeding device when clamping the heat sink;

5 is a schematic structural diagram of the state in which the push mechanism transports the clamping mechanism holding the heat sink to the processing material level;

Figure 6 is a schematic structural diagram of the state in which the push mechanism transports the clamping mechanism to the waiting position;

In the picture: 11. Clamping cylinder; 12. Baffle plate;

21. Rodless cylinder; 22. Connecting plate;

31. Lifting cylinder; 32. Mounting plate; 4. Processing material level; 5. Heat sink; 6. Supporting plate.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", " The orientation or positional relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side", etc. is based on the orientation or positional relationship shown in the accompanying drawings, It is only for the convenience of describing the present invention and simplifying the description, not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

Example 1

Referring to Fig. 1 to Fig. 6, Fig. 1 is a schematic diagram of the overall structure of the feeding device of the present invention; Fig. 2 is a schematic front view of the feeding device; Fig. 3 is a schematic side view of the feeding device; Fig. 4 is a schematic diagram of the feeding device The schematic diagram of the structure when the clamping mechanism of the device clamps the heat sink; Figure 5 is a schematic diagram of the state structure in which the push mechanism transports the clamping mechanism with the heat sink to the processing material level; Figure 6 is the push mechanism to transport the clamping mechanism Schematic diagram of the state structure to the waiting level.

This embodiment provides a feeding device, the above-mentioned feeding device includes a material waiting level, a clamping mechanism and a pushing mechanism, wherein: the waiting material level is set close to a processing device such as a circumferential welding machine, and its function is to temporarily place and support the workpiece, For example, the heat sink 5 can be two oppositely arranged support plates, and the support plates can support the workpiece from both sides of the heat sink 5;

The above-mentioned clamping mechanism is used to clamp or release the workpiece;

The pushing mechanism is connected with the clamping mechanism and drives the clamping mechanism to be movable between the waiting material level and the processing material level 4, so that after the clamping mechanism clamps the workpiece on the waiting material level, the pushing mechanism moves the clamping mechanism To the processing material level 4, and after the clamping mechanism releases the workpiece on the processing material level 4, the push mechanism transports the clamping mechanism to the waiting material level to continue to clamp another workpiece.

Among them, the processing material level 4 is an original part of the processing device. As shown in FIG. 1 , the processing material level 4 of the circumferential welding machine is supported and fixed by the material support plate 6 . The feeding device is also provided with a waiting position, which plays the role of temporarily placing the workpiece. The employee can place the workpiece such as the heat sink 5 on the waiting position and feed it to the processing material position 4 through the cooperation of the clamping mechanism and the pushing mechanism. It does not need to be directly placed on the processing material level 4, which saves the standby time waiting for the reset of the circumferential welding machine.

After the clamping mechanism in the feeding device clamps the workpiece on the material level, the push mechanism can move the clamping mechanism to the processing material level 4 of the circumferential welding machine, and the material clamping mechanism to be released on the processing material level 4 After the workpiece, the push mechanism transports the clamping mechanism to the waiting position to continue to clamp another workpiece; in the whole feeding process, the employee only needs to place the heat sink 5 on the waiting position, which can realize multiple machines for one person without waiting. The circumferential welding machine completes the welding of the last heat sink 5 and the welding head returns to its original position, and then discharges the material on the processing material level 4, which reduces the standby time and improves the feeding efficiency and processing efficiency of the heat sink 5.

As an optional embodiment, the above-mentioned clamping mechanism includes a plurality of clamping cylinders 11 and clamping parts arranged on the telescopic ends of the clamping cylinders 11 , and a clamping space for clamping the workpiece is formed between all clamping parts. , the clamping part can be adjusted in multiple directions under the expansion and contraction of the clamping cylinder 11 so that the clamping part can clamp or release the workpiece.

When the workpiece on the material level needs to be clamped, the clamping cylinder 11 contracts and clamps and fixes the workpiece at different positions of the workpiece. When the workpiece needs to be released, the telescopic end of the clamping cylinder 11 extends to increase the scope of the clamping space Place the workpiece on the processing level 4.

In order to facilitate the clamping mechanism to clamp and release the workpiece, as an optional embodiment, as shown in FIG. 1 to FIG. 3 , the clamping mechanism includes at least two oppositely arranged clamping cylinders 11 and a baffle 12 , and the baffle 12 is provided with On the telescopic end of the clamping cylinder 11, specifically, the baffle 12 is vertically fixed on the telescopic rod of the clamping cylinder 11; and the baffles 12 are arranged at least on opposite sides of the workpiece, and the clamping cylinder 11 can push the The baffle plate 12 moves back to release the workpiece, or drives the baffle plate 12 thereon to move toward each other to clamp the workpiece.

Wherein, the structure of the baffle 12 is not specifically limited, and the two sides of the workpiece can clamp and fix the workpiece to prevent the workpiece from falling out during the movement of the conveying mechanism. In order to realize the backward and opposite movement of the baffle 12 , the telescopic ends of the cylinders on both sides are arranged opposite to each other. As shown in FIGS. 1 to 3 , in this embodiment, two clamping cylinders 11 are respectively provided on opposite sides of the workpiece so as to clamp the workpiece more stably.

As an optional embodiment, as shown in FIG. 1 and FIG. 2 , a plurality of baffles 12 are disposed on opposite sides of the workpiece along the width direction of the workpiece. For the heat sink 5 , the clamping cylinder 11 and the corresponding baffles 12 are disposed on opposite sides of the heat sink 5 along the width direction of the heat sink 5 , which can clamp the heat sink 5 more stably.

As an optional embodiment, as shown in FIG. 1 , FIG. 2 and FIG. 6 , all the clamping cylinders 11 are arranged horizontally and their upper ends are formed with a bearing surface for supporting the workpiece, and the level of the bearing surface can be equal to or higher than The horizontal height of the processing material level 4, specifically, when the workpiece needs to be placed on the processing material level 4, the height of the bearing surface is equal to or slightly higher than the height of the processing material level 4, so that when the clamping cylinder 11 is relaxed, the workpiece Just released at processing level 4.

When the workpiece is placed on the supporting surface of the clamping cylinder 11, the supporting surface supports the heat sink 5 horizontally, and at the same time, the plurality of baffles 12 are clamped by opposite sides of the workpiece. The fixing method makes the workpiece more stable on the clamping mechanism and prevents the workpiece from falling off or falling off during the movement of the conveying mechanism.

Wherein, a space for allowing the passage of the processing material level 4 is reserved between the same-side baffle 12 and/or the same-side clamping cylinder 11 in this embodiment. When the conveying mechanism moves the clamping mechanism holding the workpiece to the processing material When the position is 4, the processing material position 4 can enter the clamping mechanism and is located below the workpiece. When the clamping cylinder 11 is extended, the workpiece is placed on the processing material position 4.

As an optional embodiment, as shown in FIGS. 1 to 3 , the pushing mechanism of this embodiment includes a driving mechanism, and the driving mechanism and the clamping mechanism are connected by a connecting plate 22 , and the connecting plate 22 is arranged on the side of the processing material level 4 . The lower part and the connecting plate 22 can drive the clamping mechanism to move between the waiting material level and the processing material level 4 when the driving mechanism is extended and retracted.

The driving mechanism in this embodiment adopts a rodless cylinder 21. The rodless cylinder 21 is connected to the clamping mechanism through the connecting plate 22. The rodless cylinder 21 pushes out or retracts the clamping mechanism, so that the workpiece (heat sink 5) is at the waiting position and Make a linear motion on the processing material level 4.

Since the end of the telescopic rod of the clamping cylinder 11 is provided with a baffle 12, the baffle 12 is vertically arranged and the upper edge of the baffle 12 is higher than the upper surface of the workpiece. The next workpiece is clamped at the position. In order to prevent the influence of the baffle 12, as an optional embodiment, as shown in FIG. 1, FIG. 4-FIG. 6, the feeding device in this The pushing mechanism is connected and used to drive the pushing mechanism and the clamping mechanism to ascend or descend in the vertical direction.

After the clamping mechanism releases the workpiece on the processing material level 4, the lifting mechanism drives the pushing mechanism to descend and simultaneously lowers the clamping mechanism. Specifically, when the upper edge of the baffle 12 is lower than the lower end face of the workpiece, the pushing mechanism pushes the clamping mechanism again. When the mechanism is returned to its original position, the baffle 12 will not touch the workpiece to cause the workpiece to fall, so as to prevent the normal processing from being affected.

As an optional embodiment, as shown in FIGS. 1 and 4 to 6 , the lifting mechanism of this embodiment includes a lifting cylinder 31 , which is arranged vertically and is connected to the pushing mechanism through a mounting plate 32 . When the extension end rises, the clamping mechanism can clamp and fix the workpiece at a level equal to or higher than the processing material level 4; when the extension end of the lifting cylinder 31 is lowered, the upper edge of the clamping mechanism can be lowered to the processing material level 4 Hereinafter, specifically, the upper edge of the baffle plate 12 can be lowered below the upper end surface (lower end surface of the workpiece) of the processing level 4 .

5 and 6, when the rodless cylinder 21 transports the clamping mechanism to the processing material level 4 through the connecting plate 22, the clamping cylinder 11 stretches (relaxes), the baffles 12 on both sides move back, and the workpiece is released to the processing material level 4; the lifting cylinder 31 drives the conveying mechanism and the clamping mechanism to descend, when the upper edge of the baffle 12 is lowered below the upper end face of the processing material level 4 (the baffle 12 will not touch the heat sink 5 ). drop), the rodless cylinder 21 in the conveying mechanism pushes the clamping mechanism to reset to the waiting position, and continues to clamp the next workpiece.

As an optional embodiment, as shown in FIGS. 5 and 6 , the number of lifting cylinders 31 in this embodiment is two, and the two lifting cylinders 31 are arranged on opposite sides of the pushing mechanism.

The two lifting cylinders 31 are connected to the two sides of the conveying mechanism to more stably drive the lifting or lowering of the conveying mechanism. Specifically, a three-axis cylinder is used as the lifting cylinder 31, and the three-axis cylinder can withstand the lateral force brought by the conveying mechanism. Stable extension with side load. Specifically, as shown in FIG. 4 , the side part of the three-axis cylinder can be connected to the conveying mechanism through the mounting plate 32 .

In order to improve the automation degree of the feeding device, as an optional implementation, the clamping mechanism of this embodiment is provided with a photoelectric sensor, the photoelectric sensor is connected with a controller, the controller is connected with the clamping cylinder 11, and the photoelectric sensor is used for When it is detected that the workpiece is clamped between the baffles 12, an electrical signal is sent to the controller to trigger the controller to control the clamping cylinder 11 to shrink and clamp the workpiece when the electric signal is received.

The above-mentioned photoelectric sensor can be arranged on the side of the clamping cylinder 11 , and its sensing direction is upwardly arranged to sense the presence or absence of the workpiece. Among them, the photoelectric sensor is a mature technology in the art, and the way of connecting it with the PLC is a way well known to those skilled in the art, which will not be repeated here.

Preferably, the controller can also be connected with the rodless cylinder 21 in the push mechanism and used to control the expansion and contraction of the rodless cylinder 21 .

Taking the heat sink 5 processed by the circumferential welding machine as an example, the working process of the feeding device is as follows:

1. The employee places the heat sink 5 on the waiting position, as shown in Figure 1;

2. The photoelectric sensor on the clamping mechanism is blocked and triggered by the heat sink 5, and transmits a signal to the PLC controller. The PLC sends a clamping signal to the solenoid valve that controls the clamping cylinder 11. When the solenoid valve is triggered, the clamping cylinder 11 shrinks. The heat sink 5 is clamped by the baffles 12 on both sides, as shown in FIG. 4 ;

3. After the PLC sends the clamping signal for 1s (the above time is not limited), it sends a retraction action signal to the solenoid valve that controls the rodless cylinder 21 in the push mechanism. The solenoid valve is triggered, and the rodless cylinder 21 contracts, driving the clamped heat sink 5 to the processing material position 4 (welding station) of the circumferential welding machine, as shown in Figure 5;

4. The clamping cylinder 11 is stretched, the baffle 12 releases the heat sink 5, and the heat sink 5 is placed on the processing material level 4, as shown in Figure 5.

5. The lifting cylinder 31 drives the conveying mechanism down, the baffle 12 drops below the processing material level 4, the rodless cylinder 21 of the pushing mechanism relaxes, and drives the clamping mechanism to return to the waiting material level to clamp the next heat sink 5, as shown in Figure 6 shown.

Specifically, the time between each step can be set by the PLC. For example, in step 3, after the PLC sends a signal for 0.5s, it sends a descending signal of the lifting mechanism to the solenoid valve that controls the lifting cylinder 31. The lifting cylinder 31 contracts and the device descends. After the circumferential welding machine completes the previous working cycle, it autonomously detects the existence of the heat sink 5 at the processing material level 4, the circumferential welding starts the welding work, and sends a welding work start signal to the PLC. After the PLC receives the signal, it sends the clamping cylinder relaxation signal to the solenoid valve that controls the clamping cylinder 11 , the solenoid valve is triggered to act, the clamping cylinder 11 relaxes, and the heat sink 5 is released. After the PLC sends out the signal for 0.5s, it sends the lift mechanism down signal to the solenoid valve that controls the lift cylinder 31, the solenoid valve acts, the lift cylinder 31 contracts, and the device descends. After the PLC sends the descending signal of the lifting component for 0.5s, it sends the push mechanism relaxation signal to the solenoid valve that controls the action of the rodless cylinder 21, the solenoid valve is triggered, and the rodless cylinder 21 relaxes. After the PLC sends the signal for 2s, the PLC sends the clamping cylinder relaxation signal, and the clamping mechanism returns to its original position to prepare for the next workflow.

Example 2

This embodiment provides a circumferential welding machine, which includes a processing material level 4 and the above-mentioned feeding device, and the feeding device is used for feeding the heat sink 5 .

The heat sink is welded together by the welding device on the circumferential welding machine. After welding a piece of heat sink, the circumferential machine will automatically raise the completed heat sink by one heat sink height, and the automatic feeding device will feed a piece of material to the processing material level. The finished product after welding is removed, and the next processing process is continued.

The processing material level 4 is the existing material level of the circular welding machine. In the circular welding machine in this embodiment, by setting the above-mentioned feeding device, the employee only needs to place the heat sink 5 on the waiting material level, and more than one person can be realized. It is not necessary to wait for the circular machine to complete the welding of the last piece of heat sink 5 and the welding head returns to its original position before discharging material on the processing material level 4, which reduces the standby time and improves the feeding efficiency and processing efficiency of the heat sink 5.

As described in this specification, the particular features, structures or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (11)

1. The utility model provides a loading attachment, its characterized in that is including treating the material level, pressing from both sides material mechanism and pushing mechanism, wherein:

the clamping mechanism is used for clamping or releasing a workpiece;

push mechanism with press from both sides material mechanism and connect and drive it is in to press from both sides material mechanism treats mobilizable setting between material level and the processing material level, with press from both sides material mechanism clamp and get treat behind the work piece on the material level, push mechanism will press from both sides material mechanism and remove extremely processing material level department, just treat it is in to press from both sides material mechanism is in behind the release work piece on the processing material level push mechanism will press from both sides material mechanism and carry extremely treat on the material level and press from both sides in order to continue to press from both sides and get another work piece.

2. The feeding device according to claim 1, wherein the clamping mechanism comprises a plurality of clamping cylinders and clamping parts arranged at telescopic ends of the clamping cylinders, clamping spaces for clamping the workpiece are formed among all the clamping parts, and the clamping parts can be adjustably arranged in multiple directions under the telescopic action of the clamping cylinders so as to clamp or release the workpiece.

3. The feeding device according to claim 1, wherein the material clamping mechanism comprises at least two oppositely arranged material clamping cylinders and baffle plates, the baffle plates are arranged at the telescopic ends of the material clamping cylinders, the baffle plates are arranged at least at two opposite sides of the workpiece, and the material clamping cylinders can push the baffle plates thereon to move back to release the workpiece or drive the baffle plates thereon to move oppositely to clamp the workpiece.

4. A loading apparatus according to claim 3, wherein said baffle plates are provided on opposite sides of said work in a width direction of said work.

5. A loading device according to claim 2 or 3, wherein all the material clamping cylinders are arranged horizontally and have their upper ends formed with a support surface for supporting the workpiece, and the level of the support surface can be equal to or higher than the level of the processing level.

6. The feeding device according to any one of claims 2 to 4, wherein the pushing mechanism comprises a driving mechanism, the driving mechanism is connected with the material clamping mechanism through a connecting plate, the connecting plate is arranged at the lower part of the processing material level, and the connecting plate can drive the material clamping mechanism to move between the material waiting level and the processing material level when the driving mechanism stretches.

7. A feeding device according to any one of claims 1-4, further comprising a lifting mechanism, wherein the lifting mechanism is connected to the pushing mechanism and is configured to drive the pushing mechanism to ascend or descend in a vertical direction.

8. The loading device according to claim 7, wherein the lifting mechanism comprises a lifting cylinder which is vertically arranged and is connected with the pushing mechanism through a mounting plate, and the clamping mechanism can clamp and fix the workpiece at a level equal to or higher than the processing material level when the extending end of the lifting cylinder is lifted; when the extending end of the lifting cylinder descends, the upper edge of the material clamping mechanism can be lowered to be below the processing material level.

9. The feeding device as claimed in claim 8, wherein the number of the lifting cylinders is two, and the two lifting cylinders are disposed on opposite sides of the pushing mechanism.

10. The feeding device according to claim 3, wherein a photoelectric sensor is arranged on the clamping mechanism, the photoelectric sensor is connected with a controller, the controller is connected with the clamping cylinder, and the photoelectric sensor is used for sending an electric signal to the controller when detecting that a workpiece is clamped between the baffle plates so as to trigger the controller to control the clamping cylinder to contract and clamp the workpiece when receiving the electric signal.

11. A circumferential welding machine, characterized in that it comprises a processing station and a loading device according to any one of claims 1 to 10, said loading device being used for loading the fins.

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