Lightning conductor accessory mounting and lifting device

Abstract

The embodiment of the invention provides a lightning conductor accessory mounting and lifting device, and belongs to the field of power line maintenance. The lightning conductor accessory mounting and lifting device comprises a hook component which is hung on a lightning conductor to hook the lightning conductor; the scissor jack part is connected with the top of the hook part so as to lift or loosen the hook part; the top fixing part is connected with the top of the scissor jack part, and the top fixing part can be fixed on a lightning conductor cross arm of an iron tower; and the hand crank is connected with a rotating shaft of the scissor jack part so as to drive the scissor jack part to stretch out and draw back. The lightning conductor accessory installing and lifting device can simply and conveniently lift the lightning conductor.

Description

Technical Field

[0001] The invention relates to the field of power line maintenance, and in particular to a lightning arrester accessory installation and lifting device. Background Art

[0002] A lightning conductor is a line used for lightning protection or data transmission on power transmission lines, and it usually uses steel stranded wire. In the construction of power grids, many auxiliary tools are needed. After the construction of the lightning conductor of a high-voltage line is completed, it is often necessary to use tools to lift a part of the lightning conductor when installing accessories. However, because the vertical load of the lightning conductor is too large, the general wire lifting device cannot easily lift the lightning conductor, and the existing wire lifting device is complicated and non-standard in operation, which is not conducive to the staff to lift the wire quickly. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a lightning conductor accessory installation and lifting device, which can simply and conveniently lift the lightning conductor.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides a lightning arrester accessory installation and lifting device, the lightning arrester accessory installation and lifting device comprising:

[0005] A hook component, hooked to the lightning conductor to hook up the lightning conductor;

[0006] A scissor jack top connected to the top of the hook component to lift or release the hook component;

[0007] A top fixing part connected to the top of the scissor jack top, and the top fixing part can be fixed on the lightning arrester cross arm of the iron tower;

[0008] A hand crank is connected to the rotating shaft of the top of the scissor jack to drive the top of the scissor jack to extend and retract.

[0009] Optionally, the scissor jack top comprises:

[0010] A pair of upper brackets, the tops of the upper brackets are rotatably connected to each other and connected to the bottom ends of the top fixing parts;

[0011] A pair of lower brackets, the bottoms of the lower brackets are rotatably connected to each other and connected to the tops of the hook components, and the tops of the lower brackets are rotatably connected to the bottoms of the corresponding upper brackets;

[0012] A first connecting block is arranged at the connection between the upper bracket and the lower bracket on one side, and a threaded hole is arranged in the first connecting block;

[0013] The second connecting block is arranged at the connection between the upper bracket and the lower bracket on the other side, the rotating shaft passes through the second connecting block and is rotatably connected to the second connecting block, and passes through the threaded hole of the first connecting block and is threadedly connected to the first connecting block, and one end of the rotating shaft close to the second connecting block is connected to the hand crank so as to be driven to rotate by the hand crank.

[0014] Optionally, the top fixing portion includes:

[0015] An F-type support, the gap of which is used to be inserted into the lightning arrester cross arm of the iron tower;

[0016] A positioning bolt passes through the top of the F-type support and is threadedly connected to the top of the F-type support so as to be rotated so that the F-type support is fastened to the lightning arrester cross arm of the iron tower;

[0017] A support plate, arranged at the bottom of the F-shaped support;

[0018] A connecting plate, the top of which is connected to the bottom of the supporting plate, and the bottom of which is connected to the top of the upper bracket.

[0019] Optionally, one end of the rotating shaft close to the second connecting block is square, and one end of the hand crank is provided with a square hole, and the square hole can be inserted into the end of the rotating shaft close to the second connecting block.

[0020] Optionally, the other end of the hand crank is provided with anti-slip grooves.

[0021] Optionally, a notch is provided at the top of the connecting plate, and the support plate can be inserted into the notch. The lightning conductor accessory installation and lifting device includes a connecting bolt, which passes through the connecting plate and the support plate and is connected to a nut. The bottom of the connecting plate is rotatably connected to the top of the upper bracket.

[0022] Optionally, the lightning arrester accessory installation and lifting device includes:

[0023] A scale, the top end of which is rotatably arranged on the top of the upper bracket, and a slide groove is arranged inside the scale;

[0024] The indicating block has its bottom end rotatably arranged at the bottom of the lower bracket, the indicating block can be inserted into the slide slot and move along the slide slot, and a triangular block is arranged on the top of the indicating block.

[0025] Optionally, the connection between the scale and the indicating block and the upper bracket and the lower bracket is a damping connection.

[0026] Optionally, the hook component includes:

[0027] A rotating block, rotatably arranged at the bottom of the lower bracket, and a supporting block is arranged at the bottom of the rotating block;

[0028] A limiting ring, rotatably disposed on the supporting block;

[0029] The third connecting block is arranged at the bottom of the rotating block, and an S-shaped fixing piece is provided at the bottom of the third connecting block. The lightning conductor can be loaded into the S-shaped fixing piece, and the limiting ring can be screwed into the locking mechanism of the S-shaped fixing piece.

[0030] Optionally, a T-shaped slot is provided in the third connecting block, and the lightning arrester accessory installation and lifting device comprises:

[0031] A T-shaped block, disposed at the bottom of the rotating block and capable of being inserted into the T-shaped slot to move along the T-shaped slot;

[0032] A spring is arranged in the T-slot, and the bottom of the spring is connected to the bottom of the T-slot, and the top of the spring is connected to the bottom of the T-block, so as to elastically push the third connecting block downward.

[0033] Through the above technical scheme, a lightning conductor accessory installation and lifting device provided by the present invention can hook up the lightning conductor that needs to be lifted by providing a hook component, and a scissor jack top can be connected to the top of the hook component, and the scissor jack top can lift or loosen the hook component, thereby lifting or loosening the lightning conductor. The top fixing portion can be connected to the top of the scissor jack top, and can be fixed on the lightning conductor cross arm of the iron tower. The hand crank can be connected to the rotating shaft of the scissor jack top, so as to drive the scissor jack top to extend and retract, and then lift or loosen the lightning conductor. The lightning conductor accessory installation and lifting device can be easily fixed on the iron tower, and the lightning conductor can be easily lifted or loosened by the scissor jack top.

[0034] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0036] Figure 1 is a front three-dimensional view of a lightning arrester accessory installation and lifting device according to one embodiment of the present invention;

[0037] Figure 2 According to one embodiment of the present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0038] Figure 3 is a three-dimensional view of the reverse side of a lightning arrester accessory installation and lifting device according to one embodiment of the present invention;

[0039] Figure 4 It is a three-dimensional view of a hook component of a lightning conductor accessory installation lifting device according to one embodiment of the present invention.

[0040] Description of Reference Numerals

[0041] 1. Hook component 2. Scissor jack top

[0042] 20. Rotating shaft 21. Upper bracket

[0043] 22. Lower bracket 23. First connecting block

[0044] 24. Second connecting block 3. Top connecting part

[0045] 30. F-type support 31. Gap

[0046] 32. Positioning bolt 33. Support plate

[0047] 34. Connecting plate 35. Notch

[0048] 4. Hand crank 5. Square hole

[0049] 6. Anti-slip pattern 7. Connecting bolts

[0050] 8. Nut 9. Scale

[0051] 10. Slide 11. Indicator block

[0052] 12. Triangle block 13. Rotation block

[0053] 14. Support block 15. Limit ring

[0054] 16. Third connecting block 17. S-shaped fixing piece

[0055] 18. T-block 19. Spring

[0056] 20. T-slot DETAILED DESCRIPTION

[0057] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0058] Figure 1It is a front three-dimensional view of a lightning conductor accessory installation and lifting device according to one embodiment of the present invention. In one embodiment of the present invention. The lightning conductor accessory installation and lifting device may include: a hook component 1, a scissor jack top 2, a top fixing portion 3 and a hand crank 4. The hook component 1 can be hooked to the lightning conductor of the transmission line, so that the lightning conductor can be hooked up. A scissor jack top 2 can be connected to the top of the hook component 1. The scissor jack top 2 can be extended and retracted so that the hook component 1 can be lifted or loosened, and then the lightning conductor can be lifted or loosened. The top fixing portion 3 can be connected to the top of the scissor jack top 2, and the top fixing portion 3 can be fixed to the lightning conductor cross arm of the iron tower. The hand crank 4 can be connected to the rotating shaft 20 of the scissor jack top 2, so that it can be rotated to drive the scissor jack top 2 to extend and retract.

[0059] When the lightning conductor needs to be lifted, the top fixing part 3 can be fixed on the lightning conductor crossarm of the iron tower above the lightning conductor, and then the hook component 1 can be hung on the lightning conductor. After the hook component 1 is hung on the lightning conductor, the hand crank 4 can be connected to the rotating shaft 20, and then the hand crank 4 can be rotated to drive the rotating shaft 20 to rotate. The rotation of the rotating shaft 20 can drive the extension and retraction of the top 2 of the scissors-type jack. When the top 2 of the scissors-type jack contracts, the hook component 1 can be driven to lift up, so that the lightning conductor hung with the hook component 1 can be pulled up to facilitate the completion of subsequent work.

[0060] In one embodiment of the present invention, Figure 1As shown, the scissor jack top 2 may include: an upper bracket 21, a lower bracket 22, a first connection block 23, and a second connection block 24. The upper bracket 21 may be a pair, and the tops of the pair of upper brackets 21 may be rotatably connected to each other, and the tops of the upper brackets 21 may be connected to the bottom of the top fixing portion 3. The lower bracket 22 may be a pair, and the bottoms of the pair of lower brackets 22 may be rotatably connected to each other, and the bottoms of the lower brackets 22 may be connected to the top of the hook component 1. The tops of the lower brackets 22 may be rotatably connected to the bottoms of the corresponding upper brackets 21, respectively. The first connection block 23 may be provided at the connection between the upper bracket 21 and the lower bracket 22 on one side, and a threaded hole may be provided in the first connection block 23. The second connection block 24 may be provided at the connection between the upper bracket 21 and the lower bracket 22 on the other side, and the rotation shaft 20 may pass through the second connection block 24 and be rotatably connected to the second connection block 24. The positions of the rotation shaft 20 and the second connection block 24 may be relatively fixed. The rotating shaft 20 may be provided with a thread, and the rotating shaft 20 may pass through the threaded hole of the first connecting block 23 and be threadedly connected to the first connecting block 23. One end of the rotating shaft 20 close to the second connecting block 24 may be connected to the hand crank 4, so that it can be driven to rotate by the hand crank 4. When the hand crank 4 drives the rotating shaft 20 to rotate, because the rotating shaft 20 passes through the second connecting block 24 and is rotatably connected to the second connecting block 24, the rotating shaft 20 can rotate in the second connecting block 24, and because the rotating shaft 20 is threadedly connected to the first connecting block 23, when the rotating shaft 20 rotates, the first connecting block 23 can be driven to move closer to or farther from the second connecting block 24, and the upper bracket 21 and the lower bracket 22 can be driven to move closer to or farther from each other, so that the scissor jack top 2 can be driven to extend and retract, so as to drive the hook component 1 to rise or move downward.

[0061] In one embodiment of the present invention, Figure 1As shown, the top fixing part 3 may include: an F-type support 30, a positioning bolt 32, a support plate 33 and a connecting plate 34. The gap 31 of the F-type support 30 can be used to be clamped on the lightning conductor cross arm of the iron tower. The positioning bolt 32 can pass through the top of the F-type support 30 and can be threadedly connected with the top of the F-type support 30. When the positioning bolt 32 rotates, the head of the positioning bolt 32 can be close to or away from the side wall of the gap 31, because the gap 31 can be clamped on the lightning conductor cross arm. When the positioning bolt 32 rotates, the head of the positioning bolt 32 can be close to the tower body and fit tightly with the F-type support 30 on the lightning conductor cross arm, so that the F-type support 30 can be fastened to the lightning conductor cross arm of the iron tower. The support plate 33 can be arranged at the bottom of the F-type support 30. The top of the connecting plate 34 can be connected to the bottom of the support plate 33. The bottom of the connecting plate 34 can be connected to the top of the upper bracket 21. After the positioning bolt 32 fixes the F-shaped support 30 to the lightning conductor cross arm of the iron tower, the scissor jack top 2 can also be fixed to the lightning conductor cross arm of the iron tower.

[0062] In one embodiment of the present invention, Figure 1 As shown, the end of the rotating shaft 20 close to the second connecting block 24 may be square. One end of the hand crank 4 may be provided with a square hole 5. The square hole 5 may be inserted into the end of the rotating shaft 20 close to the second connecting block 24. Because one end of the second connecting block 24 is square, and one end of the hand crank 4 is provided with a square hole 5, when the square hole 5 is inserted into the end of the rotating shaft 20 close to the second connecting block 24, the hand crank 4 and the rotating shaft 20 will not be relatively displaced, and the rotating shaft 20 can be rotated by rotating the hand crank 4.

[0063] In one embodiment of the present invention, Figure 1 As shown, the other end of the hand crank 4 can be provided with an anti-skid pattern 6. Because the other end of the hand crank 4 is provided with an anti-skid pattern 6, the staff can more easily hold the hand crank 4 when operating the hand crank 4 to avoid the situation where the hand crank 4 falls off due to slipping.

[0064] In one embodiment of the present invention, Figure 3 As shown, a notch 35 may be provided at the top of the connecting plate 34. The support plate 33 may be inserted into the notch 35. The lightning protection line accessory installation and lifting device may include a connecting bolt 7. The connecting bolt 7 may pass through the connecting plate 34 and the support plate 33 and be connected to a nut 8. Because the support plate 33 and the connecting plate 34 may be connected by the connecting bolt 7 and the nut 8, the support plate 33 and the connecting plate 34 may rotate relative to each other, so when the lightning protection line is lifted, the support plate 33 and the connecting plate 34 may rotate relative to each other as needed. The bottom of the connecting plate 34 may be rotatably connected to the top of the upper bracket 21.

[0065] In one embodiment of the present invention, Figure 2 As shown, the lightning conductor accessory installation and lifting device may include: a scale 9 and an indicator block 11. The top of the scale 9 can be rotatably set on the top of the upper bracket 21, and a slide groove 10 can be provided in the scale 9. The bottom end of the indicator block 11 can be rotatably set at the bottom of the lower bracket 22. The indicator block 11 can be inserted into the slide groove 10 and can move along the slide groove 10. A triangular block 12 can be provided on the top of the indicator block 11. The cooperation of the scale 9 and the indicator block 11 can indicate the degree to which the lightning conductor accessory installation and lifting device lifts the lightning conductor, and the staff can intuitively judge whether the lightning conductor can be lifted again according to the degree to which the lightning conductor is lifted.

[0066] In one embodiment of the present invention, the connection between the scale 9 and the indicator block 11 and the upper bracket 21 and the lower bracket 22 can be a damping connection, so when it is not necessary to observe the degree of lifting of the lightning conductor, the scale 9 and the indicator block 12 can be moved to both sides. When it is necessary to observe the degree of lifting of the lightning conductor, the scale 9 and the indicator block 11 can be moved to the middle of the scissor jack top 2 to intuitively observe the degree of lifting of the lightning conductor.

[0067] In one embodiment of the present invention, Figure 4 As shown, the hook component 1 may include: a rotating block 13, a limiting ring 15 and a third connecting block 16. The rotating block 13 may be rotatably disposed at the bottom of the lower bracket 22, and a support block 14 may be provided at the bottom of the rotating block 13. The limiting ring 15 may be rotatably disposed on the support block 14. The third connecting block 16 may be disposed at the bottom of the rotating block 13, and an S-shaped fixing member 17 may be provided at the bottom of the third connecting block 16. The lightning conductor may be loaded into the S-shaped fixing member 17, and the limiting ring 15 may be screwed into the locking mechanism of the S-shaped fixing member 17. By Figure 4It can be seen that the S-shaped fixing is a wide fixing. When the lightning conductor is installed in the S-shaped fixing 17, because the S-shaped fixing 17 has a larger contact area with the lightning conductor, compared with the traditional hook, the wear on the lightning conductor is smaller, so that the lightning conductor can be better protected. The limit ring 15 can be rotatably arranged on the support block 14. When the lightning conductor needs to be hung, the limit ring 15 can be opened from the S-shaped fixing 17, and then the lightning conductor is installed on the S-shaped fixing 17, and then the limit ring 15 is screwed into the locking mechanism of the S-shaped fixing 17, so that when the lightning conductor is pulled up, it can be ensured that the lightning conductor will not fall off from the S-shaped fixing frame 17, and in the process of pulling up the lightning conductor, because of the interaction between the limit tube 15 and the locking mechanism of the S-shaped fixing 17, the limit ring 15 can be more firmly fixed on the S-shaped fixing 17. The portion of the S-shaped fixing member 17 that contacts the lightning conductor may be made of insulating material and may have a certain degree of deformation capability, so that when the lightning conductor is pulled, it may be slightly deformed, so that the limiting ring 15 may be better fixed on the S-shaped fixing member 17 .

[0068] In one embodiment of the present invention, Figure 4 As shown, a T-slot 20 may be provided in the third connection block 16. The lightning arrester accessory installation and lifting device may include: a T-block 18 and a spring 19. The T-block 18 may be arranged at the bottom of the rotating block 13. The T-block 18 may be inserted into the T-slot 20, so that it can move along the T-slot 20. The spring 19 may be arranged in the T-slot 20, and the bottom of the spring 19 may be connected to the bottom of the T-slot 20. The top of the spring 19 may be connected to the bottom of the T-block 18, so that the third connection block 16 may be elastically pushed downward. Due to the presence of the spring 19, the third connecting block 16 can be pushed downward by the spring 19, and then the S-shaped fixing part 17 on the third connecting block 16 can be locked downward with the limiting ring 15, so that when the lightning conductor is installed in the S-shaped fixing part 17 but the lightning conductor is not pulled up, the lightning conductor can also be well enclosed in the S-shaped fixing part 17 to prevent the lightning conductor from falling off from the S-shaped fixing part 17.

[0069] Through the above technical scheme, a lightning conductor accessory installation and lifting device provided by the present invention can hook up the lightning conductor that needs to be lifted by providing a hook component, and a scissor jack top can be connected to the top of the hook component, and the scissor jack top can lift or loosen the hook component, thereby lifting or loosening the lightning conductor. The top fixing portion can be connected to the top of the scissor jack top, and can be fixed on the lightning conductor cross arm of the iron tower. The hand crank can be connected to the rotating shaft of the scissor jack top, so as to drive the scissor jack top to extend and retract, and then lift or loosen the lightning conductor. The lightning conductor accessory installation and lifting device can be easily fixed on the iron tower, and the lightning conductor can be easily lifted or loosened by the scissor jack top.

[0070] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0071] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A lightning arrester accessory installation and lifting device, characterized in that: The lightning arrester accessory installation and lifting device comprises: A hook component (1) is hooked onto the lightning conductor to hook up the lightning conductor; A scissor jack top (2) connected to the top of the hook component (1) to lift or release the hook component (1); A top fixing portion (3) is connected to the top of the scissor jack top portion (2), and the top fixing portion (3) can be fixed on the lightning arrester cross arm of the iron tower; A hand crank (4) is connected to the rotating shaft (20) of the scissor-type jack top (2) to drive the scissor-type jack top (2) to extend and retract.

2. The lightning protection line accessory installation and lifting device according to claim 1, characterized in that: The scissor jack part (2) comprises: A pair of upper brackets (21), the tops of the upper brackets (21) being rotatably connected to each other and connected to the bottom ends of the top fixing portions (3); A pair of lower brackets (22), the bottoms of the lower brackets (22) are rotatably connected to each other and connected to the top of the hook component (1), and the tops of the lower brackets (22) are rotatably connected to the bottoms of the corresponding upper brackets (21); A first connection block (23) is arranged at the connection between the upper bracket (21) and the lower bracket (22) on one side, and a threaded hole is arranged in the first connection block (23); The second connecting block (24) is arranged at the connection between the upper bracket (21) and the lower bracket (22) on the other side, the rotating shaft (20) passes through the second connecting block (24) and is rotatably connected to the second connecting block (24), and passes through the threaded hole of the first connecting block (23) and is threadedly connected to the first connecting block (23), and one end of the rotating shaft (20) close to the second connecting block (24) is connected to the hand crank (4) so ​​as to be driven to rotate by the hand crank (4).

3. The lightning protection line accessory installation and lifting device according to claim 2 is characterized in that: The top fixing portion (3) comprises: An F-shaped support (30), wherein a gap (31) of the F-shaped support (30) is used to be inserted into a lightning conductor cross arm of the iron tower; A positioning bolt (32) passes through the top of the F-shaped support (30) and is threadedly connected to the top of the F-shaped support (30) so as to be rotated so that the F-shaped support (30) is fastened to the lightning protection wire cross arm of the iron tower; A support plate (33) is arranged at the bottom of the F-shaped support (30); A connecting plate (34), wherein the top of the connecting plate (34) is connected to the bottom of the supporting plate (33), and the bottom of the connecting plate (34) is connected to the top of the upper bracket (21).

4. The lightning protection line accessory installation and lifting device according to claim 2, characterized in that: One end of the rotating shaft (20) close to the second connecting block (24) is square, and one end of the hand crank (4) is provided with a square hole (5), and the square hole (5) can be inserted into one end of the rotating shaft (20) close to the second connecting block (24).

5. The lightning protection line accessory installation and lifting device according to claim 2, characterized in that: The other end of the hand crank (4) is provided with an anti-slip pattern (6).

6. The lightning protection line accessory installation and lifting device according to claim 3, characterized in that: The top of the connecting plate (34) is provided with a notch (35), and the supporting plate (33) can be inserted into the notch (35). The lightning protection line accessory installation and lifting device includes a connecting bolt (7), and the connecting bolt (7) passes through the connecting plate (34) and the supporting plate (33) and is connected to a nut (8). The bottom of the connecting plate (34) is rotatably connected to the top of the upper bracket (21).

7. The lightning protection line accessory installation and lifting device according to claim 1, characterized in that: The lightning arrester accessory installation and lifting device comprises: A scale (9), the top end of which is rotatably arranged on the top of the upper bracket (21), and a slide groove (10) is arranged inside the scale (9); An indicator block (11), the bottom end of which is rotatably arranged at the bottom of the lower bracket (22), the indicator block (11) can be inserted into the slide groove (10) and move along the slide groove (10), and a triangular block (12) is arranged on the top end of the indicator block (11).

8. The lightning protection line accessory installation and lifting device according to claim 7, characterized in that: The connection between the scale (9) and the indicator block (11) and the upper bracket (21) and the lower bracket (22) is a damping connection.

9. The lightning protection line accessory installation and lifting device according to claim 1, characterized in that: The hook component (1) comprises: A rotating block (13) is rotatably arranged at the bottom of the lower bracket (22), and a supporting block (14) is arranged at the bottom of the rotating block (13); A limiting ring (15) rotatably disposed on the supporting block (14); The third connecting block (16) is arranged at the bottom of the rotating block (13), and an S-shaped fixing piece (17) is provided at the bottom of the third connecting block (16), the lightning conductor can be installed in the S-shaped fixing piece (17), and the limiting ring (15) can be screwed into the locking mechanism of the S-shaped fixing piece (17).

10. The lightning protection line accessory installation and lifting device according to claim 9, characterized in that: The third connecting block (16) is provided with a T-shaped slot (20), and the lightning arrester accessory installation and lifting device comprises: A T-shaped block (18) is arranged at the bottom of the rotating block (13) and can be inserted into the T-shaped slot (20) to move along the T-shaped slot (20); A spring (19) is arranged in the T-shaped slot (20), and the bottom of the spring (19) is connected to the bottom of the T-shaped slot (20), and the top of the spring (19) is connected to the bottom of the T-shaped block (18) to elastically push the third connecting block (16) downward.

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