Electric telescopic lifting appliance for processing large-diameter steel pipe anti-corrosion finished product

Abstract

The utility model discloses an electric telescopic lifting appliance for solving the problem of large-diameter steel pipe anti-corrosion finished products, which belongs to the technical field of large-diameter steel pipe anti-corrosion production and processing and comprises a balance beam, two ends of the balance beam are fixedly connected with a guide frame through reinforcing rib plates, and power source motor speed reducers are arranged on the reinforcing rib plates. The output end of the power source motor speed reducer is connected with a transmission gear shaft on the guide frame; the C-shaped hook head is meshed and connected with a driving wheel gear on the transmission gear shaft through a rack pair; a plurality of pairs of guide bearings are further fixedly arranged on the guide frame and make contact with the side face of the C-shaped hook head. The balance beam is further provided with an anti-disengagement telescopic pull rod, and one end of the anti-disengagement telescopic pull rod pulls the C-shaped hook head. According to the utility model, the C-shaped hook head can do telescopic motion relative to the balance beam, and the C-shaped hook head can be pulled through the anti-falling groove telescopic pull rod to prevent the C-shaped hook head from falling off; the C-shaped hook head can be guided and limited, the stability of the C-shaped hook head is guaranteed, and small friction force between the C-shaped hook head and the balance beam can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of large-diameter steel pipe anti-corrosion production and processing, and specifically relates to an electric telescopic hanger for solving the problem of large-diameter steel pipe anti-corrosion finished products. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] At present, when large-diameter steel pipes are produced and anti-corrosion is carried out, due to production process reasons, the steel pipes need to be heated in a heating furnace before anti-corrosion inside and outside to facilitate the adsorption of PE powder. After the anti-corrosion work inside and outside the steel pipe is completed, there is still a certain amount of residual heat in the steel pipe, and the PE powder also needs a certain amount of cooling and solidification time, which results in the pipes after the anti-corrosion processing cannot be lifted and moved in time. Due to site limitations, when the previous pipe cannot be lifted and moved, the next pipe cannot continue to be processed. Most of the time, the anti-corrosion work is spent on cooling the pipes, and continuous production and processing cannot be carried out, resulting in low production and processing efficiency.

[0004] Due to the large diameter and heavy weight of the anti-corrosion pipes, there is no suitable lifting equipment, and the large-diameter anti-corrosion pipes that have not been fully cured cannot be moved to the work station for cooling in time. Large lifting equipment was purchased in the early stage. Due to the large weight of the pipes, the required hooks are also very large. When lifting the pipes, 4-6 people are needed to drag the hooks at each end, which has high labor intensity and will cause damage and scratches to the anti-corrosion pipes. Utility Model Content

[0005] In view of the above problems, the utility model provides an electric telescopic hoist for solving the problem of large-diameter steel pipes after anti-corrosion processing is completed. The C-shaped hooks on both sides of the balance beam can be automatically extended and retracted to meet the needs of lifting large-diameter pipes and solve the problem that large-diameter steel pipes cannot be lifted and moved after anti-corrosion processing is completed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An electric telescopic hanger for solving the problem of large-diameter steel pipe anti-corrosion after completion, comprising a balance beam, both ends of which are fixedly connected to a guide frame through a reinforcing rib plate, a power source motor reducer is arranged on the reinforcing rib plate, the output end of the power source motor reducer is connected to a transmission gear shaft on the guide frame, a C-shaped hook head is meshedly connected with a driving wheel gear on the transmission gear shaft through a rack pair; a plurality of pairs of guide bearings are fixedly arranged on the guide frame, the guide bearings are in contact with the side surfaces of the C-shaped hook head; an anti-slip groove telescopic pull rod is also arranged on the balance beam, one end of the anti-slip groove telescopic pull rod holds the C-shaped hook head.

[0008] Preferably, the C-shaped hook head is fixedly connected by a lower hook head, a vertical section, and an upper hook head; a circular arc-shaped rubber pad is provided at one end of the lower hook head facing the balance beam. The circular arc-shaped rubber pad is designed according to the inner wall arc of the pipe and can fit the inner wall of the pipe; the length of the vertical section is greater than the height of the balance beam; the length of the upper hook head is twice the length of the lower hook head.

[0009] Preferably, a rack pair is installed in the middle of one end of the top of the upper hook head. A hole is drilled in the vertical surface of the rack pair and fixed with bolts. After the rack pair is fixed, a steel plate block is welded at each of the front and rear ends; the cross-sectional dimension of the C-shaped hook head is smaller than the cross-sectional dimension of the balance beam and smaller than the cross-sectional dimension of the guide frame.

[0010] Preferably, the guide frame includes two side plates arranged oppositely. The tops of the two side plates are fixedly connected to the top plate, and the bottoms of the side plates are fixedly connected to the top surface of the balance beam; one of the side plates is fixedly connected to the balance beam through three uniformly arranged reinforcing rib plates; a first cross plate is welded to the tops of the three reinforcing rib plates. The first cross plate is welded to the side plate, and a power source motor reducer is fixedly arranged on the first cross plate.

[0011] Preferably, a fixed ear plate is fixedly arranged on the outside of the top of each side plate facing the guide frame. The two fixed ear plates are arranged oppositely. A bearing seat is fixedly connected to the fixed ear plate. The two bearing seats are respectively rotatably connected to both ends of the transmission gear shaft. One end of the transmission gear shaft is connected to the output end of the power source motor reducer through a coupling.

[0012] Preferably, a power gear is fixedly arranged on the transmission gear shaft. The position of the power gear is exactly in the middle of the top plate, and there is an opening in the middle of the top plate. The power gear falls into the opening in the middle of the top plate and meshes with the rack pair.

[0013] Preferably, four groups of bearing holes are provided at the bottoms of the side plates for installing lifting bearings. The bottom of the upper hook head is placed on the lifting bearings; a pair of guide bearings are provided at both ends of the top plate and both ends of the side plates. The guide bearings on the top plate are located on both sides of the power gear, and the guide bearings are in contact with the side surface or the top surface of the upper hook head.

[0014] Preferably, the guide bearing includes an inner seat and an outer seat. One end of the inner seat is provided with a guide bearing wheel, and the other end of the inner seat is tightly buckled in the outer seat. The outer seat is fixedly connected to the top plate or the side plate; the outer seat is in a "C" shape, and a spring is arranged in the outer seat. One end of the spring abuts against the inner seat, and the other end abuts against the limiting side wall of the outer seat; two tightening bolts are threadedly connected to the limiting side wall and are located on both sides of the spring.

[0015] Preferably, the anti-slip groove telescopic pull rod includes a first rod, a second rod and a third rod; a first ear plate is provided at one end of the first rod, a first bolt hole is provided on the first ear plate, a first ear plate is also provided at the end of the upper hook head away from the vertical section, and the first rod and the upper hook head are hinged by a first bolt passing through the first ear plate; the first rod is hollow inside, and a relative long groove is provided in the middle of the rod body, the diameter of the second rod is smaller than the diameter of the first rod, and a relative protruding tenon is provided at one end of the second rod, and the end of the second rod with the protruding tenon is provided inside the first rod, and the protruding tenon is stuck in the long groove; a second ear plate is provided at the other end of the second rod, a second bolt hole is provided on the second ear plate, and second bolt holes are provided at both ends of the third rod, the second rod and the third rod are hinged by the second bolt, and the other end of the third rod is hinged to the balance beam.

[0016] Preferably, the power source motor reducer is controlled by the command of the power control box, which has a signal receiver installed in the middle of the balance beam; the power source motor reducer can rotate forward and reverse; and it also includes a remote control, which sends out a control signal, and the signal receiver can control the forward and reverse rotation of the power source motor reducer according to the received signal, and can also control the start and stop of the power source motor reducer.

[0017] Compared with the prior art, the utility model has the following advantages and positive effects:

[0018] The utility model can lift the C-shaped hook head by the lifting bearing arranged in the guide frame, so as to reduce the friction between the C-shaped hook head and the balance beam; guide and limit the telescopic movement of the C-shaped hook head by multiple pairs of guide bearings arranged in the guide frame, so as to enhance the stability of the C-shaped hook head in the telescopic movement; pull the C-shaped hook head by the anti-slip groove telescopic pull rod, so as to limit the C-shaped hook head when it is extended to the maximum position, and effectively prevent it from falling off; by arranging a rack pair on the C-shaped hook head, and driving the power gear on the gear transmission shaft to mesh with the rack pair by the power source motor reducer, the C-shaped hook head can be telescopically moved relative to the balance beam; the action of the power source motor reducer is controlled by the power control box with a signal receiver, so as to achieve the purpose of driving the C-shaped hook head to lift and unload the pipe. The rubber pad on the C-shaped hook head of the utility model is designed according to the arc shape of the inner wall of the pipe, and can be matched with the inner wall of the pipe, so as to ensure that the anti-corrosion layer of the inner wall of the pipe after anti-corrosion is not damaged. After the rubber block is flattened or worn, the original rubber block can be removed and then replaced with a new rubber block, so as to achieve the purpose of long-term repeated use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 It is a front overall schematic diagram of an embodiment of the utility model;

[0021] Figure 2 It is an embodiment of the utility model Figure 1 A is an enlarged schematic diagram;

[0022] Figure 3 It is a side schematic diagram of an embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional schematic diagram of a guide bearing of an embodiment of the utility model;

[0024] Figure 5 It is an embodiment of the utility model Figure 2 The enlarged schematic diagram of point B in FIG.

[0025] In the figure:

[0026] 1-balance beam, 2-C-shaped hook, 21-lower hook, 22-vertical section, 23-upper hook, 3-guide frame, 31-top plate, 32-side plate, 321-fixed ear plate, 322-bearing seat, 323-bearing hole, 33-transmission gear shaft, 331-driving wheel gear, 4-power source motor reducer, 5-guide bearing, 51-inner seat, 52-guide bearing wheel, 53-outer seat, 531-limited side wall, 54-spring, 55-tightening bolt, 6-anti-slip groove telescopic pull rod, 61-first rod, 611-long groove, 62-second rod, 621-protruding tenon, 63-third rod, 7-rubber pad, 8-rack pair, 9-lifting bearing, 10-strengthening rib plate, 101-first horizontal plate, 11-power control box. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] The utility model is described in detail below in conjunction with the accompanying drawings. The embodiment disclosed in this invention is an electric telescopic hanger for solving the problem of large-diameter steel pipe anti-corrosion products. Figure 1As shown, it includes a balance beam 1, both ends of which are fixedly connected to the guide frame 3 through a reinforcing rib plate 10, a power source motor reducer 4 is arranged on the reinforcing rib plate 10, the output end of the power source motor reducer 4 is connected to the transmission gear shaft 33 on the guide frame 3, and the C-shaped hook head 2 is meshed and connected with the driving wheel gear 331 on the transmission gear shaft 33 through a rack pair 8 to realize a telescopic connection, and a plurality of groups of guide bearings 5 ​​are also fixedly arranged on the guide frame 3, and the guide bearings 5 ​​are in contact with the side of the C-shaped hook head 2 to prevent the C-shaped hook head 2 from shifting when it moves relative to the balance beam 1; an anti-slip groove telescopic pull rod 6 is also arranged on the balance beam 1, and one end of the anti-slip groove telescopic pull rod 6 holds the C-shaped hook head 2 to limit the displacement of the C-shaped hook head 2.

[0029] In this embodiment, if Figure 1 As shown, the lower part of the balance beam 1 is a rectangular parallelepiped, and the upper part is a trapezoidal body, and the length of the trapezoidal body is shorter than the rectangular parallelepiped.

[0030] In this embodiment, if Figure 2 As shown, the C-shaped hook head 2 is formed by three parts fixedly connected: a lower hook head 21, a vertical section 22, and an upper hook head 23; an arc-shaped rubber pad 7 is provided at one end of the lower hook head 21 facing the balance beam 1. The arc-shaped rubber pad 7 is designed according to the arc shape of the inner wall of the pipe and can match the inner wall of the pipe to ensure that the anti-corrosion layer of the inner wall of the pipe after corrosion protection is not damaged. After the arc-shaped rubber pad is flattened or worn, the original arc-shaped rubber pad can be removed and then replaced with a new arc-shaped rubber pad to achieve the purpose of long-term repeated use.

[0031] In this embodiment, the C-shaped hook is cut from a steel plate using a plasma cutter. Each hook uses 8 pieces of 24mm thick cut steel plates. A hole is punched in the middle of the steel plate to insert a pin. The length of the pin is 170mm, which is less than the thickness of the 8 steel plates (192mm). The two ends of the pin are riveted to ensure that the entire C-shaped hook is uniformly stressed. The material of the C-shaped hook is Q355, and the length of the middle pin is less than the thickness of the steel plate 12mm, so as to facilitate riveting and welding at both ends.

[0032] In this embodiment, if Figure 2 As shown, the length of the vertical section 22 is greater than the height of the balance beam 1, so that sufficient vertical space can be reserved to clamp the pipe wall; the length of the upper hook head 23 is twice the length of the lower hook head 21, so as to ensure that when half of the upper hook head 23 extends out of one side of the balance beam 1, the vertical extension line of the lower hook head 21 away from the end of the vertical section 22 can coincide with the side of the balance beam 1, which can ensure that the distance between the two C-shaped hooks is large enough while ensuring the safety and stability of the device.

[0033] In this embodiment, if Figure 1 , Figure 2As shown, a rack pair 8 of model 4 is installed in the middle of one end of the top of the upper hook head 23. The rack pair 8 is punched on the vertical surface and fixed with bolts. After the rack pair is fixed, a steel plate block is welded at the front and rear ends to ensure the stability of the rack pair. Figure 3 As shown, the cross-sectional dimension of the C-shaped hook head is smaller than the cross-sectional dimension of the balance beam 1 and smaller than the cross-sectional dimension of the guide frame 3 .

[0034] like Figure 2 , Figure 3 As shown, the guide frame 3 includes a top plate 31 and two side plates 32 which are fixedly connected together. The side plates 32 are fixedly connected to the top surface of the balance beam 1. Three reinforcing rib plates 10 are evenly arranged and welded on the side plates 32. Figure 2 , Figure 3 As shown, the reinforcing rib plate 10 is arranged vertically with the side plate 32, and the guide frame 3 is welded to the beam body of the balance beam 1, which ensures the stability and reliability of the guide frame 3 when subjected to force. A first transverse plate 101 is also welded to the top of the three reinforcing rib plates 10, and the first transverse plate 101 is welded to the side plate 32 of the guide frame 3, and a power source motor reducer 4 is fixedly arranged on the first transverse plate 101, and the power source motor reducer 4 is fixed to the top of the reinforcing rib plate 10 of the guide frame 3.

[0035] In this embodiment, if Figure 3 As shown, a fixed ear plate 321 is fixedly provided on the top of the two side plates 32 of the guide frame 3 toward the outside of the guide frame 3, and the two fixed ear plates 321 are arranged opposite to each other. A bearing seat 322 is fixedly connected to the fixed ear plate 321, and the two bearing seats 322 are rotatably connected to the two ends of the transmission gear shaft 33 respectively, and one end of the transmission gear shaft 33 is connected to the output end of the power source motor reducer 4 through a coupling.

[0036] In this embodiment, if Figure 3 As shown, a power gear 331 is fixedly arranged on the transmission gear shaft 33, and the position of the power gear 331 is exactly in the middle of the top plate 31, and the top plate 31 is open in the middle, and the power gear 331 can fall into the middle opening of the top plate 31 and mesh with the rack pair 8, thereby realizing the transmission of telescopic movement; the power gear 331 shaft and the guide frame 3 are installed in a vertical direction. It can be understood that when the power source motor reducer 4 rotates, it drives the transmission gear shaft 33 to rotate relative to the bearing seat 322, thereby driving the power gear 331 to rotate, so that the rack pair 8 moves, and drives the C-shaped hook head 2 to move left and right.

[0037] In this embodiment, if Figure 2 , Figure 3As shown, four groups of bearing holes 323 are provided at the bottom of the side plates 32 for installing the supporting bearings 9. The bottom of the hook head 23 on the C-shaped hook head 2 is placed on the supporting bearings 9, which can reduce the friction between the C-shaped hook head 2 and the balance beam 1 when the C-shaped hook head 2 moves left and right relative to the balance beam 1. It can be understood that bearing caps are provided for the bearing holes 323 to facilitate timely replacement of the bearings.

[0038] In this embodiment, as Figure 2 、 Figure 3 shown, on both sides of the power gear 331 at both ends of the top plate 31, and on the upper and lower sides at both ends of the side plates 32, paired and grouped guiding bearings 5 are fixedly connected. The guiding bearings 5 are in contact with the side surface or the top surface of the hook head 23 on the C-shaped hook head 2. When the C-shaped hook head 2 moves left and right driven by the rack and pinion pair 8, multiple pairs of guiding bearings 5 are provided to prevent the C-shaped hook head 2 from shifting when moving relative to the balance beam 1, ensuring the stability of the C-shaped hook head 2 during movement, and jointly playing a guiding role with the supporting bearings 9.

[0039] In this embodiment, as Figure 4 shown, the guiding bearing 5 includes an inner seat 51 and an outer seat 53. One end of the inner seat 51 is provided with a guiding bearing wheel 52, and the guiding bearing wheel 52 can contact the hook head 23. The other end of the inner seat 51 is tightly fastened inside the outer seat 53, and the outer seat 53 is fixedly connected to the top plate 31 or the side plate 32. The outer seat 53 is in a "C" shape, and a spring 54 is provided inside the outer seat 53. One end of the spring 54 abuts against the inner seat 51, and the other end abuts against the limiting side wall 531 of the outer seat 53. The inner seat 51 and the outer seat 53 are separated by the spring 54.

[0040] As Figure 4 shown, two tightening bolts 55 are further provided on the limiting side wall 531 of the outer seat 53. The tightening bolts 55 are threadedly connected to the side wall of the outer seat 53 and are located on both sides of the spring 54. By adjusting the tightening bolts 55, the length of the inner seat 51 that can enter the inside of the outer seat 53 can be changed, thereby adjusting the distance between the guiding bearing wheel 52 and the limiting side wall 531, and thus the contact gap between the guiding bearing 5 and the C-shaped hook head 2 can be adjusted. It can be understood that the inner seat 51 and the outer seat 53 can be cylindrical or cuboid-shaped, as long as one side of the outer seat 53 is open and the inside is hollow, a spring 54 can be provided to abut against the inner seat 51, and two tightening bolts 55 can be provided on both sides of the spring 54 on the limiting side wall 531.

[0041] As Figure 5As shown, the front end of the upper hook head 23 of the C-shaped hook head 2 is provided with a first ear plate, and a first bolt hole is provided on the first ear plate; the anti-slip groove telescopic pull rod 6 includes a first rod 61, a second rod 62, and a third rod 63. One end of the first rod 61 is also provided with a first ear plate of the same size as the front end of the upper hook head 23, and the ear plate is also provided with a first bolt hole of the same size. One end of the first rod 61 is hinged with the front end of the upper hook head 23 through the first bolt passing through the first ear plate.

[0042] The first rod 61 is hollow inside, and a corresponding long slot 611 is opened in the middle of the rod body. The diameter of the second rod 62 is smaller than that of the first rod 61. One end of the second rod 62 extends into the rod body of the first rod 61. This end of the second rod 62 is provided with a corresponding protruding tenon 621, which is stuck in the long slot 611. The second rod 62 can move relatively in the first rod 61, but its moving stroke is limited by the protruding tenon 621 and the long slot 611. The other end of the second rod 62 is provided with a second ear plate, and the second ear plate is provided with a second bolt hole. The two ends of the third rod 63 are provided with second bolt holes. The second rod 62 and the third rod 63 are hinged by the second bolt, and the other end of the third rod 63 is hinged to the third bolt hole on the balance beam 1.

[0043] In this embodiment, the first rod 61 is hinged to the upper hook head 23, the first rod 61 and the second rod 62 are telescopically connected, the second rod 62 and the third rod 63 are hinged, and the third rod 63 is hinged to the balance beam 1; when the C-shaped hook head 2 extends outward, it drives the first rod 61 to extend outward, and when the first rod 61 moves to the point where its movement is restricted by the protruding tenon, when the first rod 61, the second rod 62, and the third rod 63 tend to be in a straight line, the C-shaped hook head 2 can be restricted when it is extended to the maximum position, effectively preventing it from falling off.

[0044] like Figure 1 As shown, considering the operability of the equipment, the two power source motor reducers 4 are controlled by the command of the power control box 11, and the power control box 11 has a signal receiver. The power control box 11 is installed in the middle of the balance beam 1, which is conducive to the control of the power source motor reducers 4 at both ends. It can be understood that the power source motor reducer 4 can be reversed.

[0045] In this embodiment, the signal receiver can adopt the existing technology, and the signal receiver in the power control box 11 can control the forward and reverse rotation of the power source motor reducer 4 according to the received signal, and can also control the start and stop of the power source motor reducer 4. A remote controller is also included. It can be understood that the staff operates the remote controller that can send control signals to drive the power source motor reducer 4 to operate and rotate the power gear, so that the C-type hook head can achieve telescopic movement relative to the balance beam, so as to achieve the purpose of driving the C-type hook head to hang and unload pipes.

[0046] In terms of covering the production and processing of steel pipes, the main pipe diameters ranging from φ1620mm to φ3620mm can be applied to the large-diameter steel pipe anti-corrosion electric telescopic hanger device provided in this embodiment, which almost covers all large-diameter steel pipe production and processing operations currently on the market.

[0047] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes, characterized in that: It includes a balance beam. Both ends of the balance beam are fixedly connected to a guide frame through reinforcing rib plates. A power source motor reducer is arranged on the reinforcing rib plates. The output end of the power source motor reducer is connected to a transmission gear shaft on the guide frame. A C-shaped hook head is meshed and connected to a driving wheel gear on the transmission gear shaft through a rack and pinion pair. A plurality of pairs of guide bearings are also fixedly arranged on the guide frame. The guide bearings are in contact with the side surface of the C-shaped hook head. An anti-drop groove telescopic pull rod is also arranged on the balance beam. One end of the anti-drop groove telescopic pull rod pulls the C-shaped hook head.

2. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 1, characterized in that: The C-shaped hook head is fixedly connected by a lower hook head, a vertical section, and an upper hook head. An arc-shaped rubber pad is arranged at the end of the lower hook head facing the balance beam. The arc-shaped rubber pad is designed according to the inner wall arc of the pipe and can fit with the inner wall of the pipe. The length of the vertical section is greater than the height of the balance beam. The length of the upper hook head is twice the length of the lower hook head.

3. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 2, characterized in that: A rack and pinion pair is installed in the middle of one end of the top of the upper hook head. Holes are drilled in the vertical surface of the rack and pinion pair and fixed with bolts. After the rack and pinion pair is fixed, steel plate blocks are welded at both the front and rear ends. The cross-sectional dimension of the C-shaped hook head is smaller than the cross-sectional dimension of the balance beam and smaller than the cross-sectional dimension of the guide frame.

4. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 1, characterized in that: The guide frame includes two oppositely arranged side plates. The tops of the two side plates are fixedly connected to a top plate. The bottoms of the side plates are fixedly connected to the top surface of the balance beam. One of the side plates is fixedly connected to the balance beam through three uniformly arranged reinforcing rib plates. A first cross plate is welded on the top of the reinforcing rib plate. The first cross plate is welded to the side plate, and the power source motor reducer is fixedly arranged on the first cross plate.

5. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 4, characterized in that: A fixed ear plate is fixedly arranged on the top of each side plate facing the outside of the guide frame. The two fixed ear plates are oppositely arranged. A bearing seat is fixedly connected to the fixed ear plate. The two bearing seats are respectively rotatably connected to both ends of the transmission gear shaft. One end of the transmission gear shaft is connected to the output end of the power source motor reducer through a coupling. A power gear is fixedly arranged on the transmission gear shaft. The position of the power gear is exactly in the middle of the top plate, and there is an opening in the middle of the top plate. The power gear falls into the opening in the middle of the top plate and meshes with the rack and pinion pair.

6. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 4, characterized in that: Four groups of bearing holes are arranged at the bottoms of both side plates for arranging lifting bearings. The bottom of the upper hook head is placed on the lifting bearings. A pair of guide bearings are arranged at both ends of the top plate and both ends of the side plates. The guide bearings on the top plate are located on both sides of the power gear. The guide bearings are in contact with the side surface or the top surface of the upper hook head.

7. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 6, characterized in that: The guide bearing includes an inner seat and an outer seat. The outer seat is in a "C" shape. One end of the inner seat is tightly fastened inside the outer seat, and the other end is provided with a guide bearing wheel. The outer seat is fixedly connected to the top plate or the side plate. A spring is arranged inside the outer seat. One end of the spring抵住 the inner seat, and the other end抵住 the limiting side wall of the outer seat. Two tightening bolts are threadedly connected to the limiting side wall and are located on both sides of the spring.

8. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 1, characterized in that: The anti-drop groove telescopic pull rod includes a first rod, a second rod, and a third rod. One end of the first rod is hinged to the end of the upper hook head away from the vertical section.

9. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 8, characterized in that: The first rod is hollow inside and a relative long groove is set in the middle of the rod body. The diameter of the second rod is smaller than that of the first rod. One end of the second rod is provided with a relative protruding tenon. The end of the second rod with the protruding tenon is set inside the first rod so that the protruding tenon is stuck in the long groove; the other end of the second rod is hinged to one end of the third rod, and the other end of the third rod is hinged to the balance beam.

10. The electric telescopic hanger for solving the problem of corrosion protection of large-diameter steel pipes as claimed in claim 1, characterized in that: The power source motor reducer is controlled by the command of the power control box, the power control box is equipped with a signal receiver, and the power control box is installed in the middle of the balance beam; it also includes a remote controller capable of sending control signals.

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