CN203474321U - Tower crane used for constructing and erecting electric transmission line iron towers - Google Patents

Abstract

The utility model proposes a tower crane for erecting transmission line iron towers, including a steel structure base, a jacking frame, a tower body, a slewing support device, a boom, a hook, a tower head, a cable, a balance arm, Boom luffing mechanism, hoisting mechanism, control room and movable counterweight system. The counterweight system includes counterweight, counterweight trolley, counterweight traction mechanism, traction wire rope, steering pulley and control system, counterbalance trolley Carrying the balance weight and moving along the balance arm; the movable balance weight can reduce the unbalanced moment on the tower body, improve the force condition of the tower body, increase the lifting capacity of the tower crane or reduce the section size of the tower body under the same lifting capacity and weight, thereby reducing processing costs and facilitating transportation, disassembly and on-site handling. The utility model has the advantages of small structural size and weight of the tower body, high safety, flexible hoisting, high construction efficiency, etc., and can meet the needs of erecting iron towers of various voltage levels and various types of transmission lines.

Description

A tower crane for erecting transmission line iron towers

technical field

The utility model belongs to the field of overhead transmission line construction equipment, in particular to a special tower crane equipped with a movable counterweight system for erecting transmission line iron towers.

Background technique

The erection construction of poles and towers is a construction link with heavy workload, high construction difficulty and many risk factors in the construction of transmission lines. At present, large mobile cranes or helicopters are mainly used for tower construction in foreign countries. For example, the United States, Canada and other countries have generally used large mobile cranes or helicopters for tower construction, while the main equipment for domestic tower construction is various forms of poles. The poles for power transmission and transformation construction (including single poles, rocker poles, etc.) are light and small lifting equipment. They are simple lifting equipment commonly used in the construction of overhead transmission line towers in my country, and are rarely used abroad. . During the construction of the pole, it is necessary to set up multiple stay wires, the construction process is complicated, the coordination requirements are high, and its quality is uneven. Restricted by complex terrain and inconvenient transportation, many tower positions cannot be reached by large mobile cranes, and large-scale use of helicopters to assemble towers is not yet available in our country. With the improvement of the voltage level of the transmission line, the size and weight of the iron tower increase significantly, the installation accuracy requirements are increasing, and the construction difficulty is also increasing. At the same time, higher requirements are put forward for construction safety. Therefore, the development is suitable for my country's current national conditions The demand for new type of tower construction equipment is becoming increasingly urgent.

Based on the principle of traditional double-rocker arm holding poles, in recent years, domestic transmission line construction units have developed several large-scale floor holding poles for tower construction. According to the different working methods of the boom, large floor-standing booms can be divided into floor-standing double-flat arm booms and floor-standing double-rocker boom booms. The reciprocating movement of the movable trolley along the direction of the boom realizes the adjustment of the horizontal position of the hoisting weight, while the horizontal position of the hoisting weight is changed through the pitching of the booms on both sides when the double rocker arms are working. The above-mentioned large-scale floor-standing poles mainly include the floor-standing double rocker arm poles developed by Jiangsu Power Transmission and Transformation Company, the floor-standing double-flat arm poles developed by Hubei Power Transmission and Transformation Engineering Company, and the balanced moment group tower developed by Shandong Power Transmission and Transformation Engineering Company. Cranes (the form is basically the same as that of the floor-standing double-arm poles), etc. These large-scale floor poles are similar in structure to the construction tower cranes. With two booms, both sides can work at the same time, but the booms on both sides need to be hoisted and put in place at the same time, which requires extremely high construction cooperation, occupies a large site, is obviously restricted by the terrain, and has many construction workers.

In the prior art, there is also a tower crane developed by China Electric Power Research Institute, which adopts the design scheme of single boom and no balance arm, and is applied in the construction of UHV transmission lines. Short boom length (simply lengthening the boom will lead to a significant increase in the weight of the boom), and the absence of a balance arm, etc., resulting in a large cross-sectional size and weight of the tower body, which cannot meet the assembly needs of heavy-weight iron towers for UHV lines. Although a lot of researches have been done on tower cranes in the prior art, there are deficiencies, such as:

The Chinese invention patent application with the publication number CN102491199A discloses a tower crane and its balance arm. At least one intermediate jib section between the jib section and the second jib section; counterweight, the counterweight is set on the first jib section; bracket, the bracket is set on the second jib section; a tie rod with adjustable length, one end of the tie rod is connected with The bracket is detachably connected, and the other end of the pull rod is detachably connected to any one of a plurality of different connection positions of the first arm section. The utility model changes the distance between the balance weight and the intersection point of the center line of the pull rod and the center line of the first arm section, thereby improving the stress condition of the arm section. The purpose of this utility model is to change the distance between the balance weight and the intersection point between the centerline of the pull rod and the centerline of the first boom section, thereby improving the stress situation of the boom section. The working principle of the utility model is to change the position of the balance weight by adjusting the length of the balance arm, and to change the length of the balance arm by adding or removing the jib section of the balance arm, thereby changing the position of the balance weight. In order to improve the adverse effect of the force of the balance arm due to the change of the angle of the tie rod after the length of the balance arm changes, the utility model sets a plurality of tie rod connection holes at the end of the balance arm to ensure that the intersection point of the tie rod and the balance arm is near the center of gravity of the balance weight, thereby Improve the force of the balance arm. The purpose and principle of this utility model are all irrelevant to this application.

The Chinese utility model patent with the notification number CN202744238U discloses a tower crane with automatic control balance, including a tower body, a balance arm, a lifting arm, a balance trolley, a lifting trolley, a steel wire rope and a hook, and the balance trolley is equipped with a balance heavy, and also includes a controller, the lifting trolley is provided with an encoder I for detecting the position of the lifting trolley, and the balancing trolley is provided with an encoder II for detecting the position of the balancing trolley, and both the balancing trolley and the lifting trolley are motor-driven The electric trolley, the lifting trolley, the wire rope or the hook are equipped with a weight sensor to detect the weight of the lifting weight, and the controller is used to receive the detection signals of the encoder I, encoder II and the weight sensor and to control the balancing trolley and the lifting The motor of the trolley. The application object of this utility model is a flat arm tower crane, and the application is a moving arm tower crane, and the working principles of the two are different. This utility model also does not provide the specific layout and working principle of the counterweight moving mechanism, which is significantly different from the present application.

The Chinese invention patent with the publication number CN101624165A discloses a combined counterweight device and a crane using the device. Aiming at the problem that the existing counterweight device cannot move forward and backward, the combined counterweight device described in the patent includes a balance arm body, Two horizontal slide rails, balance weight brackets, two vertical oil cylinders and two horizontal oil cylinders; wherein, the vertical oil cylinders are fixed on the balance weight brackets through the cylinder bodies of the two vertical oil cylinders, and the balance weight brackets are Under the action of two horizontal oil cylinders, it can slide back and forth along the horizontal slide rails fixedly arranged on both sides of the tail of the turntable. The balance weight body can move in the front and back directions, and the backward sliding can effectively improve the stability of the whole crane under the long boom and large-scale working conditions; the forward sliding can reduce the length of the whole vehicle, making the crane layout compact, and at the same time , It has a smaller turning diameter when driving on curves, which improves the driving performance of the crane. This utility model is used for mobile cranes, and is mainly used to solve the problem that the length of the large-tonnage mobile crane is too long in the non-lifting state and transition state. By setting two horizontal oil cylinders, the balance weight can be moved forward and backward along the horizontal direction. Move, under the working condition, the position of this balance weight then is fixed, and there is essential difference with this application.

The Chinese utility model patent with the notification number CN201770430U discloses a self-balancing tower crane, which solves the problem of serious unbalance of the existing tower crane due to the different forces on the balance arm and the lifting arm and the time-consuming problem when the sleeve frame is raised. strenuous question. The structure of the crane is as follows: a balance weight and a luffing mechanism are respectively arranged on the balance arm, a horizontal switch connected in series to the power supply circuit of the motor is fixed on the balance arm, a travel switch is fixed at the tail of the balance arm and the travel switches are connected in series respectively. Connected to the power supply circuit of the balance arm and the boom motor. It overcomes the problems of serious unbalance caused by the different forces on the balance arm and the lifting arm of the existing tower cranes and the time-consuming and labor-intensive problems when the sleeve frame is raised. The lifting arm and the balance arm are always kept in a horizontal state, which effectively improves the The safety of production, and by changing the structure of the tower body, the lifting operation of the sleeve frame saves time and labor, effectively improves the construction efficiency, and has the advantages of simple structure and low cost. The utility model explains that "the boom and the balance arm are always kept in a horizontal state", that is, the application object is a horizontal arm tower crane, and this application is a moving arm tower crane, and the purpose of adding the balance weight movement function is to control The difference between the forward tilting moment and the backward tilting moment of the tower crane reduces the moment on the tower body, thereby improving the force on the tower body and reducing the cross-sectional size and weight of the tower body; in addition, the utility model repeatedly emphasizes "making the balance arm Same as the weight on the jib, the balance jib and jib are horizontal". In terms of control strategy, the description of "when the balance arm and the lifting arm tilt on the other side" is wrong, "make the gravity on the balance arm and the lifting arm the same", which will cause the balance weight to be very heavy, which is not suitable for transmission lines Group tower use.

The Chinese invention patent application with the publication number CN102862921A discloses a mobile lifting crane with a position-variable counterweight, including: a car body with movable ground engaging parts; A turntable on which joint members oscillate; a cantilever pivotally mounted on the front of the turntable; a mast mounted at its first end to the turntable; a rear jib connected between the mast and the rear of the turntable; a movable counterweight unit ; at least one hydraulic ram; and at least one arm pivotally connected at its first end to the turntable and at its second end to the hydraulic ram. The arm and the hydraulic cylinder are connected between the turntable and the balance weight unit, so that the expansion and contraction of the hydraulic cylinder changes the position of the balance weight unit relative to the turntable. In one method of operation, the counterweight is positioned forward of a point just below the top of the mast when there is no load on the hoisting lines of the load suspended from the jib and positioned when the load is supported on the hoisting lines Behind the top of the mast; during the pick-up, move-and-place operations of the crane, the movable counterweight is never supported by the ground, but is supported indirectly on the carbody by ground-engaging components. In another embodiment, the crane is used to perform pick, move, and place loads, wherein the movable counterweight is moved closer to or farther away from the turntable by extending and retracting hydraulic rams during the pick, move, and place operations to Helps balance the load, but the counterweight unit is never supported by the ground, but is supported indirectly on the vehicle body by ground-engaging components. Aiming at the problem that the extra large tonnage mobile crane has a large additional balance weight, the utility model proposes a connecting rod mechanism to adjust the position of the balance weight. And the present application is realized by the balance weight wire rope luffing mechanism, and the working principle of the two is different.

Aiming at the deficiencies of the prior art, the utility model proposes a special tower crane installed with a movable counterweight system for the erection of transmission line iron towers.

Utility model content

The purpose of the utility model is to provide a tower crane for erecting transmission line iron towers, which is used to meet the erection and construction requirements of UHV transmission line iron towers.

To achieve the above object, the utility model takes the following technical solutions:

A tower crane for erecting transmission line iron towers, including a steel structure base, a jacking frame, a tower body, an attachment frame, an attachment wire rope, a slewing support device, a boom, a hook, a tower head, a drag cable, and a balance jib, jib luffing mechanism, hoisting mechanism and control room, and it is characterized in that: the crane also includes a movable counterweight system, and the counterweight system includes a counterweight, a counterweight carrying trolley, a counterweight traction mechanism, a traction Steel wire rope, steering pulley and control system, the balance weight carrying trolley carries the balance weight and moves along the balance arm under the drive of the balance weight traction mechanism and the traction wire rope; one end of the balance arm is connected with the slewing support device, and the other end passes through The stay cable is connected to the top of the tower head; a balance weight is suspended on the balance weight trolley suspended on the balance arm, and the balance weight traction mechanism and control system are installed on the balance arm, and the traction wire rope goes around the balance arm The balance weight traction mechanism and its two ends are respectively connected with the two sides of the balance weight carrying trolley through steering pulleys installed at both ends of the balance arm.

Further, a balance arm pitch mechanism is installed on the balance arm, and the balance arm pitch mechanism includes a winch and a wire rope; the balance arm remains horizontal in the working state, and when the tower crane is disassembled, the balance arm can Under the action of the hoist of the balance arm pitch mechanism, the steel wire rope of the balance arm pitch mechanism makes a pitch movement around the hinge point of the boom luffing mechanism in the vertical plane, and finally gathers on the side of the tower head to reduce the tower weight. The cross-sectional size of the crane superstructure enables the special tower crane to retreat through the top window of the assembled iron tower, so that the special tower crane can be disassembled inside the iron tower. The pitching mechanism of the balance arm is installed on the balance arm.

Further, the base of the steel structure is provided with a tower body, the outside of the tower body is equipped with a jacking sleeve, and the top of the tower body is sequentially installed with a slewing support device and a tower head from bottom to top, and the balance arm and crane The arms are respectively hinged to the outer ends of the opposite sides of the slewing support device; the outer sides of the four corners of the attachment frame sleeved on the outer side of the tower body are connected with the iron tower to be assembled through the attached steel wire rope; the lifting mechanism and the control room are located on the ground, and the The lifting mechanism is connected with the hook installed on the boom through the lifting wire rope to realize the lifting movement of the hook; , the slewing mechanism and the jacking mechanism are connected to realize the control of the above-mentioned mechanisms.

Further, the boom adopts a space truss structure, which is formed by connecting boom sections (at least 2 sections) through pin shafts, and the boom luffing mechanism includes a winch and a wire rope; one end of the boom is connected to the slewing bearing The device is hinged, the wire rope of the boom luffing mechanism is connected to the other end of the boom through the top of the tower head, and the boom moves around the hinge point in the vertical plane under the pull of the wire rope; The hoist of the luffing mechanism realizes the pitching and luffing of the boom by retracting and unwinding the wire rope of the luffing mechanism of the boom.

Further, the steel structure base is welded by section steel and steel plate, which is installed on the concrete platform through anchor bolts.

Further, the jacking frame adopts a space truss structure, on which a jacking mechanism is installed; when the tower crane is operating, the jacking frame is not connected to the tower body; when the tower body needs to be lifted, the The jacking frame is connected with the tower body through the jacking mechanism, and it is lifted and lowered.

Further, the tower body is assembled by stacking several standard sections, and every two adjacent standard sections are connected by a pin shaft; the standard sections adopt a space truss structure. According to the unbalanced moment of the tower body, it can be composed of two (L-shaped) or four (plane frame) standard segments connected by bolts or pins, and the cross-section is square after assembly.

Further, the slewing support device includes upper and lower slewing supports and a slewing mechanism, and the relative rotational movement of the upper and lower slewing supports is realized through the slewing mechanism, and the lower slewing support is fixedly connected to the top of the tower body , the top of the upper slewing support is equipped with a tower head, and the outer ends on both sides are respectively hinged with the ends of the balance arm and the boom.

Further, rollers for moving vertically along the tower body are installed on the inside of the attachment frame, and connecting plates are welded on the outside of the four corners of the attachment frame, and the connecting plates are respectively connected to the iron tower to be assembled by attaching steel wire ropes.

Compared with the prior art, the special tower crane installed with the movable counterweight system of the utility model for tower construction has the following beneficial effects:

1) The special-purpose tower crane starts and brakes smoothly, with small impact.

2) The speed control is flexible, stepless speed regulation can be realized, and the positioning accuracy is high when hoisting tower materials.

3) It is convenient to cooperate with the ground and the tower. The tower can be hoisted after the ground assembly is completed. There is no need to consider the coordination of hoisting on both sides, and the hoisting method is flexible.

4) There is no need to set up a pull wire during the hoisting process, and there are fewer operators.

5) The ground layout is simple and occupies less space.

6) The special tower crane equipped with a movable counterweight system has good stress on the tower body, strong lifting capacity and high safety.

7) With the same lifting capacity, the special tower crane equipped with a movable counterweight system has low requirements on the section and strength of the tower body, which can reduce related costs.

Description of drawings

In order to make the content of the present utility model more clearly understood, and to facilitate the description of specific embodiments, the accompanying drawings relevant to the present utility model are provided below, and are described as follows:

Fig. 1 is the structural representation of the embodiment of the group tower crane of the present utility model;

Fig. 2 is a schematic diagram of a boom, wherein Fig. 2 (a) is a schematic diagram of an embodiment of a boom composed of 2 hoisting sections, Fig. 2 (b) is a schematic diagram of an embodiment of a boom composed of 3 hoisting sections, Fig. 2 (c ) is a schematic cross-sectional view of the boom;

Fig. 3 is a schematic diagram of the balance arm and the movable counterweight system;

Fig. 4 is a schematic diagram of a tower crane of the present invention using hooks to hoist tower materials.

Detailed ways

Below in conjunction with the accompanying drawings, the tower crane for erecting iron tower construction equipped with a movable counterweight system of the present utility model will be further described in detail.

As shown in Fig. 1 and Fig. 4, a kind of tower crane specially used for erecting transmission line iron towers in the embodiment of the present invention is equipped with a movable counterweight system, which mainly includes: a steel structure base 1, a top Lifting frame 2, tower body 3, attachment frame 4, attachment wire rope 5, slewing support device 6, boom 7, hook 8, tower head 9, cable 10, balance arm 11, movable balance weight system 12, Boom luffing mechanism 13, hoisting mechanism 14 and control room 15.

The steel structure base 1 is welded by section steel and steel plate, and installed on the concrete cap. Anchor bolts are pre-embedded when the concrete cap is cast, and the steel structure base 1 and the concrete cap are connected by anchor bolts to bear the weight of the special tower crane and the suspended tower parts and the unbalanced moment of the tower body.

The tower body 3 is formed by stacking and assembling a plurality of standard sections. The standard section is a space truss structure, which is welded by section steel and has a square cross section. The adjacent standard sections are connected by bolts. During the hoisting operation, the bottom of the tower body 3 and the steel structure base 1 are connected as a whole with a pin shaft, so as to ensure that the force of the special tower crane can be transmitted to the steel structure base 1 and the concrete cap through the tower body 3; When raising or lowering the tower body, pull out the connection pin between the bottom of the tower body 3 and the steel structure base 1 to release the connection between the tower body and the steel structure base, so that the tower body can be lifted up by the jacking mechanism. Starting from the lower part of the tower, a new standard section is added to increase the height of the tower.

The attachment frame 4 is set on the outside of the tower body. The attachment frame 4 is square, and rollers are installed on its inner side, and the rollers contact and roll with the main chord of the standard section, and connecting plates are welded on the outside of the four corners of the attachment frame. Connection to ensure the stability of the tower crane when raising or lowering the tower body.

The jacking frame 2 is also installed on the steel structure base 1 . The jacking frame 2 is a space truss structure, and is fixedly connected with the steel structure base 1 by bolts. The tower body 3 is located inside the jacking frame 2 . A jacking mechanism composed of a jacking hydraulic cylinder, a hydraulic pump station and a jacking control cabinet is installed on the jacking sleeve frame 2 . During the hoisting operation of the special tower crane, the jacking frame 2 is not connected to the tower body 3; Connect, so that the tower body can be jacked up.

A slewing support device 6 is installed on the top of the tower body 3 . The slewing support device 6 is composed of a lower slewing support, an upper slewing support and a slewing mechanism, and the slewing mechanism realizes the relative rotational movement of the lower slewing support and the upper slewing support. The lower slewing support of the slewing support device 6 is fixedly connected with the tower body using bolts. The outer end of the upper slewing support of the slewing support device 6 is hinged to the boom 7 , and the balance arm 11 is articulated at the other outer end of the upper slewing support opposite to the boom 7 . The slewing support device can ensure the rotation of the upper structure such as the boom 7, the tower head 9, and the balance arm 11 under the premise that the tower body does not move, so that the suspended tower parts can be within the circumference range centered on the tower body The hoisting is in place.

The boom 7 is a space truss structure, which is assembled by connecting 2 to 3 boom sections through pin shafts. Fig. 2 shows a schematic diagram of the boom 7, wherein Fig. 2 (a) is a schematic diagram of an embodiment of a boom composed of 2 hoisting sections, and Fig. 2 (b) is a schematic diagram of an embodiment of a boom composed of 3 hoisting sections . The boom 7 includes boom sections such as the first section 31, the tail section 32 and the middle section 33, wherein the middle section 33 can be installed or not according to the actual hoisting range, so as to increase or shorten the length of the boom and improve the height of the special tower. Economical use of the crane. The boom sections are fixedly connected by pin shafts 34 to form a load-bearing whole. The end of the first section 31 has a pin shaft hole 35, which can be hingedly connected with the upper slewing support of the slewing support device 6 through the pin shaft, so that the boom 7 can be pulled by the luffing wire rope of the boom luffing mechanism 13. Pull down to make a pitching motion in the vertical plane around the hinge point. The cross section of the boom 7 is triangular ( FIG. 2 ( c )), mainly comprising an upper chord 36 , a lower chord 37 , a side web 38 and a bottom web 39 .

The balance arm 11 adopts a planar frame structure or a space truss structure, and its planar frame structure embodiment is shown in Figure 3, one end of which is hinged to the outer end of the upper slewing support of the slewing support device 6, and the other end is connected with the slewing cable 10. The top of the tower head 9 is connected. The balance arm pitching mechanism is installed on the balance arm 11, and the balance arm pitching mechanism includes a hoist and a wire rope; the balance arm is kept in a horizontal state in the working state, and when the tower crane is disassembled, the balance arm can act on the hoist of the balance arm pitch mechanism. The steel wire rope passing through the balance arm pitching mechanism makes a pitching motion around the hinge point of the boom luffing mechanism 13 in the vertical plane, and finally gathers at one side of the tower head 9 to reduce the cross-sectional size of the tower crane superstructure.

The movable counterweight system 12 is composed of a counterweight 21 , a counterweight carrying trolley 22 , a counterweight traction mechanism 23 , a traction wire rope 24 , a steering pulley 25 and a control system 26 . The balance weight carrying trolley 22 is suspended on the lower chord of the balance arm 11, on which the balance weight 21 is suspended. According to the change of the forward tilting moment produced by the boom 7 and the lifting weight, the balance weight trolley 22 can carry the balance weight 21 and move along the balance arm 11 under the drive of the balance weight traction mechanism 23 and the traction wire rope 24, thereby reducing The unbalanced moment borne by the tower body 3. The balance weight traction mechanism 23 and the control system 26 are installed on the balance arm, the traction wire rope 24 bypasses the balance weight traction mechanism 23, and its two ends are respectively carried by the steering pulley 25 and the balance weight installed at the two ends of the balance arm. The two ends of the dolly 22 are connected.

The principle of balance weight movement is: the control system tracks the forward moment generated by the boom, hoisting hook, hoisting wire rope and hoisting weight in real time. When the tilting moment is not in the range of 70% to 80% of the forward tilting moment, the control system starts the counterweight traction mechanism, and the counterweight carrying trolley drives the counterweight to adjust the position along the balance arm to change the backward tilting moment, so that the backward tilting force The moment is controlled in the range of 70-80% of the forward moment.

The movable counterweight system 12 monitors the forward tilting moment generated by the boom and the hoisting weight in real time through the control system 26, and adjusts the position of the counterweight at any time, so that the bending moment of the tower body can be greatly reduced, thereby reducing the cross-sectional size of the tower body and Lightweight, easy to transport, assemble and disassemble and handle.

A boom luffing mechanism 13 is installed on the balance arm 10, and the boom luffing mechanism 13 includes a winch and a wire rope.

A tower head 9 is also installed on the upper slewing support of the slewing support device 6 . The tower head 9 is a quadrangular space truss structure, which is fixedly connected with the upper slewing support by bolts.

The boom luffing wire rope of the boom luffing mechanism 13 is connected to the end of the boom 7 through the top of the tower head 9, and the boom luffing wire rope is retracted by the boom luffing mechanism 13 hoist to realize the pitching of the boom 7 luffing. Through the luffing operation of the boom 7, the horizontal position adjustment of the suspended tower part can be realized.

The lifting mechanism 14 and the control room 15 are arranged on the ground. The hoisting mechanism 14 is connected with the suspension hook 8 through the hoisting mechanism hoisting wire rope, so that the lifting movement of the suspension hook 8 can be realized. The control room 15 is connected with the hoisting mechanism 14, the movable counterweight system 12, the jib luffing mechanism 13, the slewing mechanism and the jacking mechanism through control cables to realize centralized control of the above mechanisms.

The balance arm of a special tower crane equipped with a movable counterweight system of the utility model is equipped with a movable counterweight system, which greatly reduces the bending moment of the tower body in working and non-working states, and reduces the The small cross-sectional size and weight of the tower facilitate transportation, assembly and disassembly, and use, and reduce manufacturing and use costs. At the same time, it has a lifting mechanism, a jib luffing mechanism, a slewing mechanism, and a jacking mechanism. It has complete functions and flexible hoisting methods , with fewer construction workers, it can meet the erection of UHV transmission line towers under large lifting moments. The tower crane of the utility model reduces the unbalanced moment on the tower body through the movable balance weight, improves the force condition of the tower body, reduces the section size and weight of the tower body, and satisfies the assembly of heavy UHV iron towers It is convenient for the installation, disassembly and transportation of the special tower crane for tower assembly. At the same time, the tower body adopts piece-type standard sections, which can simplify the transportation and loading and unloading of the crane, and meet the construction and transportation requirements in complex terrain such as mountains and mud.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible Any modification or equivalent replacement made to the specific implementation of the present utility model without departing from the spirit and scope of the present utility model shall be covered by the claims of the present utility model.

Claims (9)

1. A tower crane for erecting transmission line iron towers, comprising a steel structure base, a jacking frame, a tower body, an attachment frame, an attachment wire rope, a slewing support device, a boom, a hook, a tower head, and a drag cable , a balance arm, a boom luffing mechanism, a hoisting mechanism and a control room, characterized in that: the crane also includes a movable counterweight system, and the counterweight system includes a counterweight, a counterweight carrying trolley, and a counterweight traction mechanism , a traction wire rope, a steering pulley and a control system, the balance weight bearing trolley carries the balance weight and moves along the balance arm under the drive of the balance weight traction mechanism and the traction wire rope; one end of the balance arm is connected with the slewing support device, and the other One end is connected to the top of the tower head through a cable; a balance weight is suspended on the balance weight trolley suspended on the balance arm, and the balance weight traction mechanism and control system are installed on the balance arm, and the traction wire rope goes around The balance weight traction mechanism and its two ends are respectively connected with the two sides of the balance weight carrying trolley through steering pulleys installed at both ends of the balance arm. 2. The tower crane as claimed in claim 1, characterized in that: said balance arm is equipped with a balance arm pitching mechanism, said balance arm pitching mechanism comprises a winch and a wire rope; said balance arm remains horizontal in working condition state, when the tower crane is disassembled, the balance arm moves around the hinge point of the boom luffing mechanism in the vertical plane through the wire rope of the balance arm pitch mechanism under the action of the hoist of the balance arm pitch mechanism, and finally gathers on the side of the tower head. 3. The tower crane according to claim 1, characterized in that: a tower body is provided on the steel structure base, a jacking sleeve is set on the outside of the tower body, and the top of the tower body is installed sequentially from bottom to top There is a slewing support device and a tower head, and the balance arm and the boom are respectively hinged to the outer ends of the opposite sides of the slewing support device; the outer sides of the four corners of the attachment frame sleeved on the outside of the tower body are connected to the iron tower to be assembled by attaching steel wire ropes The hoisting mechanism and the control room are located on the ground, and the hoisting mechanism is connected with the hook installed on the boom through a hoisting wire rope; the control room is connected with the hoisting mechanism and the movable counterweight through a control cable system, boom luffing mechanism, slewing mechanism and jacking mechanism are connected. 4. The tower crane according to claim 1, characterized in that: the boom is formed by connecting boom joints through pin shafts, the luffing mechanism of the boom includes a winch and a wire rope; one end of the boom Hinged to the slewing support device, the wire rope of the boom luffing mechanism is connected to the other end of the boom through the top of the tower head, and the boom moves around the hinge point in the vertical plane under the pull of the wire rope. The hoist of the boom luffing mechanism realizes the pitching and luffing of the boom by retracting and unwinding the wire rope of the boom luffing mechanism. 5. The tower crane according to claim 1, characterized in that: the steel structure base is welded by section steel and steel plate. 6. The tower crane according to claim 1, characterized in that: the jacking frame adopts a space truss structure, on which a jacking mechanism is installed; when the tower crane is in operation, the jacking frame and the There is no connection to the tower body; when the tower body needs to be lifted, the jacking sleeve is connected with the tower body through the jacking mechanism, and the lifting operation is performed on it. 7. The tower crane according to claim 1, characterized in that: the tower body is assembled by stacking standard sections, and every two adjacent standard sections are connected by pin shafts; the standard sections use space Truss structure. 8. The tower crane according to claim 1, characterized in that: the slewing support device comprises upper and lower slewing supports and a slewing mechanism, and the relative rotational movement of the upper and lower slewing supports is realized by the slewing mechanism, The lower slewing support is fixedly connected to the top of the tower body, the top of the upper slewing support is equipped with a tower head, and the outer ends on both sides are respectively hinged with the ends of the balance arm and the boom. 9. The tower crane according to claim 1, characterized in that: rollers for vertically moving along the tower body are installed on the inner side of the attachment frame, connecting plates are welded on the outsides of the four corners of the attachment frame, and the connecting plates They are respectively connected with the iron towers to be assembled by attaching steel wire ropes.

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