CN218180736U

CN218180736U - Crack visualizer for supervision

Info

Publication number: CN218180736U
Application number: CN202222342677.6U
Authority: CN
Inventors: 丁俊; 尹东哲; 谢勇; 吴新羽; 王学文
Original assignee: Anhui Tianhan Engineering Consulting Co ltd
Current assignee: Anhui Tianhan Engineering Consulting Co ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2022-12-30
Anticipated expiration: 2032-09-01

Abstract

The application discloses manage and use crack visulizer belongs to the building field of managing, and it includes base, detection instrument and protection box, the base with protection box fixed connection, it has the lid door to articulate on the protection box, wear to be equipped with first column spinner in the protection box, first column spinner with the protection box rotates to be connected, be provided with the stay tube in the protection box, first column spinner passes the stay tube and with stay tube fixed connection, the detection instrument set up in the stay tube, be provided with in the stay tube and be used for the drive the first drive assembly that the detection instrument removed, be provided with in the base and be used for improving the supporting component of base stability. The detection instrument has the effects of protecting the detection instrument and avoiding the collision of the detection instrument.

Description

Crack visualizer for supervision

Technical Field

The application relates to the field of building supervision, in particular to a crack observation instrument for supervision.

Background

The crack observation instrument is an instrument which displays the original appearance of the surface crack of an object to be measured on a screen in real time by adopting an electronic imaging technology, and is widely applied to quantitative detection of the width of the crack of a bridge, a tunnel, a wall, a concrete pavement, a metal surface and the like.

When the crack observation appearance is used daily to the prisoner, need carry the instrument and remove everywhere, probably because artificial negligence causes the instrument to collide with to influence the precision and the life-span of instrument.

SUMMERY OF THE UTILITY MODEL

In order to prevent the crack observation instrument from colliding and further influencing the instrument precision, the application provides a crack observation instrument for supervision.

The application provides a crack visulizer for supervision adopts following technical scheme:

the utility model provides a crack visualizer for prison management, includes base, detection instrument and protection box, the base with protection box fixed connection, it has the lid door to articulate on the protection box, wear to be equipped with first column spinner in the protection box, first column spinner with the protection box rotates to be connected, be provided with the stay tube in the protection box, first column spinner passes the stay tube and with stay tube fixed connection, the detection instrument set up in the stay tube, be provided with in the stay tube and be used for the drive the first drive assembly that the detection instrument removed, be provided with in the base and be used for improving the supporting component of base stability.

Through adopting above-mentioned technical scheme, when operating personnel need use the detection instrument, operating personnel opens the lid door, operating personnel rotates the stay tube around first column spinner, make the stay tube vertical stand, first drive assembly drive detection instrument removes in the stay tube, make the detection instrument stretch out outside the stay tube, support assembly improves the stability of base, through setting up the protection box, stay tube and first drive assembly, can protect the detection instrument, make it shrink to in the stay tube when not using the detection instrument, avoid colliding with.

Preferably, first drive assembly includes first rack and first straight gear, slidable mounting has the supporting seat in the stay tube, seted up in the stay tube be used for with the first spout of supporting seat sliding fit, the detection instrument with supporting seat fixed connection, first rack fixed connection in on the first spout inside wall, wear to be equipped with the second column spinner on the supporting seat, the second column spinner with the supporting seat rotates to be connected, first straight gear fixed cover is located on the second column spinner, first straight gear with first rack intermeshing, be provided with on the supporting seat and be used for the drive second column spinner pivoted second drive assembly.

Through adopting above-mentioned technical scheme, after operating personnel opened the lid door and rotated the stay tube, second drive assembly drive second column spinner rotated, and the second column spinner made first straight gear revolve, because first straight gear and first rack intermeshing, first straight gear revolve can make first straight gear along first rack direction motion, and first straight gear motion makes the supporting seat motion, and the supporting seat removes makes the detection instrument remove outside the stay tube or contract in the stay tube.

Preferably, the second drive assembly includes worm wheel and worm, the fixed cover of worm wheel is located on the second column spinner, the worm penetrates in proper order the stay tube and the supporting seat, the worm with the supporting seat rotates to be connected, the worm with worm wheel intermeshing, offer on the stay tube be used for with the worm slides complex second spout, the worm is located fixedly connected with hand wheel on the tip outside the stay tube.

By adopting the technical scheme, an operator rotates the hand wheel, the hand wheel rotates to enable the worm to rotate, the worm rotates to enable the worm wheel to rotate, the worm wheel rotates to enable the second rotary column to rotate, the second rotary column rotates to enable the first straight gear to rotate, the first straight gear rotates to enable the first straight gear to move along the direction of the first rack, the first straight gear moves to enable the supporting seat to move, and the supporting seat moves to enable the detecting instrument to move out of the supporting tube or contract into the supporting tube.

Preferably, the supporting component comprises a supporting plate, a connecting rod penetrates through the base in a sliding mode, a third sliding groove used for being matched with the connecting rod in a sliding mode is formed in the base, the connecting rod penetrates out of the base and is hinged to the supporting plate, and a first control component used for driving the connecting rod to move is arranged in the base.

Through adopting above-mentioned technical scheme, when operating personnel rotated the stay tube, first control assembly drive connecting rod removed, and the connecting rod removes and makes the backup pad remove to improve the area of contact on base and ground, improve the stability of base, when operating personnel stopped to use the detection instrument, first control assembly drive connecting rod contracts to the third spout in, operating personnel rotated the backup pad and contracts it to protection box both sides, can reduce the device volume, conveniently carries.

Preferably, first control assembly includes second rack and second straight-teeth gear, the second rack with connecting rod fixed connection, wear to be equipped with the third column spinner in the base, third column spinner one end penetrates in the third spout and with the third spout inside wall rotates to be connected, the third column spinner other end is worn out the protection box, the fixed cover of second straight-teeth gear is located on the third column spinner, the second rack penetrates in the third spout and with second straight-teeth gear intermeshing, be provided with on the first column spinner and be used for the drive third column spinner pivoted second control assembly.

Through adopting above-mentioned technical scheme, second control assembly drive third column spinner rotates, and the third column spinner rotates and makes the second straight-toothed gear rotate, and the second straight-toothed gear rotates and makes the second rack remove in the third spout, and the second rack removes and makes the connecting rod remove, and the connecting rod removes and makes the backup pad remove to improve the area of contact on base and ground, improve the stability of base.

Preferably, the second control assembly includes first belt pulley and second belt pulley, the fixed cover of first belt pulley is located on the first column spinner, wear to be equipped with the actuating lever in the protection box, the actuating lever with the protection box rotates to be connected, the fixed cover of second belt pulley is located on the actuating lever, first belt pulley and around being equipped with driving belt on the second belt pulley, the actuating lever is kept away from fixed cover is equipped with first bevel gear on the tip of second belt pulley, the third column spinner is located fixed cover is equipped with the second bevel gear on the tip in the protection box, first bevel gear with second bevel gear intermeshing.

Through adopting above-mentioned technical scheme, when operating personnel opened the lid door and rotated the stay tube, the stay tube rotates and makes first column spinner rotate, first column spinner rotates and makes first belt pulley rotate, first belt pulley rotates and makes second belt pulley rotate through driving belt, second belt pulley rotates and makes third column spinner rotate, third column spinner rotates and makes first bevel gear rotate, first bevel gear rotates and makes second bevel gear rotate, second bevel gear rotates and makes third column spinner rotate, third column spinner rotates and makes second straight-toothed gear rotate, second straight-toothed gear rotates and makes the second rack remove in the third spout, the second rack removes and makes the connecting rod remove, the connecting rod removes and makes the backup pad remove, thereby improve the area of contact of base and ground, improve the stability of base.

Preferably, a first clamping block is fixedly connected to the supporting tube, a second clamping block is slidably arranged on the protection box, inclined planes are arranged at the end parts, close to each other, of the first clamping block and the second clamping block, and the first clamping block is clamped with the second clamping block.

Through adopting above-mentioned technical scheme, when operating personnel rotated the stay tube and made it vertical, first fixture block and second fixture block joint can improve the stability of stay tube.

Preferably, the protection box is close to slide on the tip of second fixture block and wear to be equipped with the pull rod, the pull rod with second fixture block fixed connection, the slip cover is equipped with the answer spring on the pull rod, answer spring one end with second fixture block fixed connection, the answer spring other end with protection box inside wall fixed connection.

Through adopting above-mentioned technical scheme, after first fixture block and second fixture block joint, operating personnel used up the detection instrument, and operating personnel stimulates the pull rod, and the pull rod removes and makes the second fixture block remove, and the second fixture block removes and makes first fixture block and second fixture block remove the joint.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when an operator needs to use the detecting instrument, the operator opens the cover door, rotates the supporting tube around the first rotating column, enables the supporting tube to stand vertically, the first driving assembly drives the detecting instrument to move in the supporting tube, enables the detecting instrument to extend out of the supporting tube, improves the stability of the base through the supporting assembly, can protect the detecting instrument through arranging the protection box, the supporting tube and the first driving assembly, and enables the detecting instrument to be contracted into the supporting tube when the detecting instrument is not used, so that collision is avoided;

2. an operator rotates a hand wheel, the hand wheel rotates to enable a worm to rotate, the worm rotates to enable a worm wheel to rotate, the worm wheel rotates to enable a second rotating column to rotate, the second rotating column rotates to enable a first straight gear to rotate, the first straight gear rotates to enable the first straight gear to move along the direction of a first rack, the first straight gear moves to enable a supporting seat to move, and the supporting seat moves to enable a detecting instrument to move out of a supporting pipe or contract into the supporting pipe;

3. when an operator opens the cover door and rotates the supporting tube, the supporting tube rotates to enable the first rotary column to rotate, the first rotary column rotates to enable the first belt pulley to rotate, the first belt pulley rotates to enable the second belt pulley to rotate through a transmission belt, the second belt pulley rotates to enable the third rotary column to rotate, the third rotary column rotates to enable the first bevel gear to rotate, the first bevel gear rotates to enable the second bevel gear to rotate, the second bevel gear rotates to enable the third rotary column to rotate, the third rotary column rotates to enable the second straight gear to rotate, the second straight gear rotates to enable the second rack to move in the third sliding groove, the second rack moves to enable the connecting rod to move, the connecting rod moves to enable the supporting plate to move, the contact area of the base and the ground is increased, and the stability of the base is improved.

Drawings

Fig. 1 is a schematic structural diagram of a crack monitoring instrument for supervision according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a support tube according to an embodiment of the present application.

Fig. 3 is a schematic diagram of the structure at a in fig. 2.

Fig. 4 is a schematic structural diagram of a second control assembly according to an embodiment of the present application.

Fig. 5 is a schematic diagram of the structure at B in fig. 4.

Description of reference numerals:

1. a base; 11. a detector; 12. a protection box; 121. a first clamping block; 122. a second fixture block; 123. a pull rod; 124. a return spring; 13. covering the door; 14. a first spin column; 15. supporting a pipe; 151. a first chute; 152. a second chute; 2. a first drive assembly; 21. a first rack; 22. a first straight gear; 23. a supporting seat; 24. a second spin column; 25. a worm gear; 26. a worm; 261. a hand wheel; 3. a support assembly; 31. a support plate; 32. a connecting rod; 321. a third chute; 33. a second rack; 34. a second spur gear; 35. a third spin column; 4. a second control assembly; 41. a first pulley; 42. a second pulley; 43. a drive belt; 44. a drive rod; 45. a first bevel gear; 46. a second bevel gear.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses crack visulizer for supervision. Referring to fig. 1, a crack inspection instrument for supervision includes a base 1, a protective box 12, and a cover door 13.

Referring to fig. 1 and 2, the protection box 12 is horizontally disposed, the base 1 is fixedly connected to the bottom surface of the protection box 12, and the cover door 13 is hinged to the top of the protection box 12. The inner side wall of the protection box 12 close to the cover door 13 is provided with a first rotating column 14 in a penetrating way, and the first rotating column 14 is rotatably connected with the protection box 12. A support pipe 15 is vertically arranged on the first rotary column 14, and the first rotary column 14 is fixedly connected with the support pipe 15.

Referring to fig. 2, a first clamping block 121 is fixedly connected to a side wall of the bottom end of the support tube 15 away from the first rotary column 14, a second clamping block 122 is slidably mounted on an inner bottom surface of the protection box 12 close to the first clamping block 121, and an inclined surface is disposed at an end of the first clamping block 121 close to the second clamping block 122. A pull rod 123 penetrates through the inner side wall of the protection box 12 close to the second fixture block 122 in a sliding mode, one end of the pull rod 123 penetrates through the protection shell, and the other end of the pull rod 123 penetrates through the protection box 12 and is fixedly connected with the second fixture block 122. The end of the pull rod 123 located inside the protection box 12 is slidably sleeved with a return spring 124, one end of the return spring 124 is fixedly connected to the inner side wall of the protection box 12 close to the pull rod 123, and the other end of the return spring 124 is fixedly connected to the second latch 122.

Referring to fig. 2 and 3, a support seat 23 is slidably disposed in the support tube 15, a detecting instrument 11 is fixedly connected to the support seat 23, a first sliding groove 151 for slidably fitting with the support seat 23 is disposed in the support tube 15 along the length direction thereof, and the cross section of the first sliding groove 151 is rectangular. A first drive assembly 2 is arranged in the support tube 15, the first drive assembly 2 comprising a first rack 21 and a first spur gear 22. First rack 21 and first spout 151 inside wall fixed connection, first rack 21 is vertical to be set up. A second rotating column 24 horizontally penetrates through the supporting seat 23, the second rotating column 24 is rotatably connected with the supporting seat 23, the first straight gear 22 is fixedly sleeved on the second rotating column 24, and the first straight gear 22 is meshed with the first rack 21. The supporting seat 23 is far away from the limiting block fixedly connected to the side wall of the first rack 21, and the third sliding groove 321 is far away from the inner side wall of the first rack 21 and provided with a limiting groove matched with the limiting block in a sliding manner along the length direction of the inner side wall.

Referring to fig. 2 and 3, a second driving assembly including a worm wheel 25 and a worm 26 is provided on the support base 23. The worm wheel 25 is fixedly sleeved on the end part of the second rotary column 24 far away from the first straight gear 22, the worm 26 sequentially penetrates through the supporting tube 15 and the supporting seat 23, and the worm 26 is rotatably connected with the supporting seat 23. The outer side wall of the support tube 15 is provided with a second sliding groove 152 along the length direction thereof for sliding fit with the worm 26, and the second sliding groove 152 is communicated with the first sliding groove 151. The end of the worm 26 penetrating into the support seat 23 is meshed with the worm wheel 25, and the end of the worm 26 outside the support tube 15 is fixedly connected with a hand wheel 261.

Referring to fig. 2 and 3, an operator rotates the hand wheel 261, the hand wheel 261 rotates to enable the worm 26 to rotate, the worm 26 rotates to enable the worm wheel 25 to rotate, the worm wheel 25 rotates to enable the second rotary column 24 to rotate, the second rotary column 24 rotates to enable the first straight gear 22 to rotate, the first straight gear 22 rotates to enable the first straight gear 22 to move in the direction of the first rack 21, the first straight gear 22 moves to enable the supporting seat 23 to move, and the supporting seat 23 moves to enable the detecting instrument 11 to move out of the supporting tube 15 or retract into the supporting tube 15.

Referring to fig. 4, the first rotary column 14 is provided with a second control assembly 4, and the second control assembly 4 includes a first pulley 41 and a second pulley 42. The first belt pulley 41 is fixedly sleeved on the end portion of the first rotary column 14 penetrating through the support tube 15, the driving rod 44 penetrates through the inner bottom surface of the protection box 12, and the driving rod 44 is rotatably connected with the protection box 12. The second pulley 42 is fixedly sleeved on the driving rod 44, and the driving belt 43 is wound on the first pulley 41 and the second pulley 42.

Referring to fig. 4 and 5, the base 1 is provided with a support member 3, and the support member 3 includes a support plate 31. Two connecting rods 32 are horizontally arranged in the base 1 in a penetrating mode, the connecting rods 32 are matched with the base 1 in a sliding mode, a third sliding groove 321 used for being matched with the connecting rods 32 in a sliding mode is formed in the base 1, and the two connecting rods 32 are symmetrically arranged along the axis direction of the base 1. The end of the connecting rod 32 penetrating through the third sliding slot 321 is hinged with the supporting plate 31.

Referring to fig. 4 and 5, a first control assembly is disposed in the base 1, and the first control assembly includes a second rack 33 and a second spur gear 34. The second racks 33 are fixedly connected to the side walls of the connecting rods 32 close to the adjacent connecting rods 32, and the second racks 33 correspond to the connecting rods 32 one to one. The second spur gear 34 is disposed between the two second racks 33, a third rotary column 35 vertically penetrates through the base 1, one end of the third rotary column 35 penetrates into the third sliding groove 321 and is rotatably connected with the inner bottom surface of the third sliding groove 321, and the other end of the third rotary column 35 penetrates through the base 1 and penetrates into the protection box 12. The second spur gear 34 is fixedly sleeved on the end portion of the third rotary column 35 located in the third sliding groove 321, and both the two second racks 33 are meshed with the second spur gear 34. The end of the driving rod 44 far away from the second belt pulley 42 is fixedly sleeved with a first bevel gear 45, the end of the third rotary column 35 penetrating into the protection box 12 is fixedly sleeved with a second bevel gear 46, and the second bevel gear 46 is meshed with the first bevel gear 45.

Referring to fig. 4 and 5, when the operator opens the cover door 13 and rotates the support pipe 15, the support pipe 15 rotates to rotate the first rotary column 14, the first rotary column 14 rotates to rotate the first pulley 41, the first pulley 41 rotates to rotate the second pulley 42 via the transmission belt 43, the second pulley 42 rotates to rotate the third rotary column 35, the third rotary column 35 rotates to rotate the first bevel gear 45, the first bevel gear 45 rotates to rotate the second bevel gear 46, the second bevel gear 46 rotates to rotate the third rotary column 35, the third rotary column 35 rotates to rotate the second spur gear 34, the second spur gear 34 rotates to move the second rack 33 in the third sliding groove 321, the second rack 33 moves to move the connecting rod 32, the connecting rod 32 moves to move the support plate 31, thereby increasing the contact area of the base 1 with the ground and improving the stability of the base 1.

The embodiment of the application provides an implementation principle of a crack observation instrument for supervision as follows: when the operator uses the detecting instrument 11, firstly, the cover door 13 is opened and the support plate 31 is unfolded, the operator rotates the support pipe 15 counterclockwise, and simultaneously pulls the pull rod 123, the support pipe 15 rotates to rotate the first rotary column 14, the first rotary column 14 rotates to rotate the first belt pulley 41, the first belt pulley 41 rotates to rotate the second belt pulley 42 through the transmission belt 43, the second belt pulley 42 rotates to rotate the third rotary column 35, the third rotary column 35 rotates to rotate the first bevel gear 45, the first bevel gear 45 rotates to rotate the second bevel gear 46, the second bevel gear 46 rotates to rotate the third rotary column 35, the third rotary column 35 rotates to rotate the second spur gear 34, the second spur gear 34 rotates to move the second rack 33 in the third sliding groove 321, the second rack 33 moves to move the connecting rod 32, the connecting rod 32 moves to move the support plate 31, the support plate 31 moves in a direction away from the base 1, the first clamping block 121 on the support pipe 15 is clamped with the second clamping block 122, and the operator releases the pull rod 123.

An operator rotates the hand wheel 261, the hand wheel 261 rotates to enable the worm 26 to rotate, the worm 26 rotates to enable the worm wheel 25 to rotate, the worm wheel 25 rotates to enable the second rotating column 24 to rotate, the second rotating column 24 rotates to enable the first straight gear 22 to rotate, the first straight gear 22 rotates to enable the first straight gear 22 to move in the direction of the first rack 21, the first straight gear 22 moves to enable the supporting seat 23 to move, and the supporting seat 23 moves to enable the detecting instrument 11 to move out of the supporting tube 15. By providing the support tube 15 and the first drive assembly 2, the probe 11 can be protected in the support tube 15 and removed when necessary, preventing the accuracy and the service life of the probe 11 from being affected by the collision.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a crack visulizer for supervision, includes base (1), detection instrument (11) and protection box (12), base (1) with protection box (12) fixed connection, it has lid door (13), its characterized in that to articulate on protection box (12): wear to be equipped with first column spinner (14) in protection box (12), first column spinner (14) with protection box (12) rotate to be connected, be provided with stay tube (15) in protection box (12), first column spinner (14) pass stay tube (15) and with stay tube (15) fixed connection, detection instrument (11) set up in stay tube (15), be provided with in stay tube (15) and be used for the drive detection instrument (11) first drive assembly (2) that remove, be provided with in base (1) and be used for improving support assembly (3) of base (1) stability.

2. A fracture viewer for supervision as claimed in claim 1 wherein: first drive assembly (2) include first rack (21) and first spur gear (22), slidable mounting has supporting seat (23) in supporting tube (15), set up in supporting tube (15) be used for with supporting seat (23) sliding fit's first spout (151), detection instrument (11) with supporting seat (23) fixed connection, first rack (21) fixed connection in on first spout (151) inside wall, wear to be equipped with second column spinner (24) on supporting seat (23), second column spinner (24) with supporting seat (23) rotate to be connected, first spur gear (22) fixed cover is located on second column spinner (24), first spur gear (22) with first rack (21) intermeshing, be provided with on supporting seat (23) and be used for the drive second column spinner (24) pivoted second drive assembly.

3. A crack monitor for proctoring as defined in claim 2, wherein: the second drive assembly includes worm wheel (25) and worm (26), worm wheel (25) is fixed to overlap and is located on second column spinner (24), worm (26) penetrates in proper order stay tube (15) and supporting seat (23), worm (26) with supporting seat (23) rotate to be connected, worm (26) with worm wheel (25) intermeshing, seted up on stay tube (15) be used for with worm (26) complex second spout (152) that slides, worm (26) are located fixedly connected with hand wheel (261) on the tip outside stay tube (15).

4. A fracture viewer for supervision as claimed in claim 1 wherein: supporting component (3) include backup pad (31), sliding through is equipped with connecting rod (32) in base (1), seted up in base (1) be used for with connecting rod (32) sliding fit's third spout (321), connecting rod (32) are worn out base (1) and with backup pad (31) are articulated, be provided with in base (1) and be used for the drive the first control assembly that connecting rod (32) removed.

5. A crack monitor for proctoring as defined in claim 4, wherein: first control assembly includes second rack (33) and second spur gear (34), second rack (33) with connecting rod (32) fixed connection, wear to be equipped with third column spinner (35) in base (1), third column spinner (35) one end penetrates in third spout (321) and with third spout (321) inside wall rotates and connects, third column spinner (35) other end is worn out protection box (12), second spur gear (34) fixed cover is located on third column spinner (35), second rack (33) penetrate in third spout (321) and with second spur gear (34) intermeshing, be provided with on first column spinner (14) and be used for the drive third column spinner (35) pivoted second control assembly (4).

6. A crack monitor for proctoring as defined in claim 5, wherein: second control assembly (4) include first belt pulley (41) and second belt pulley (42), first belt pulley (41) is fixed to be overlapped and is located on first column spinner (14), wear to be equipped with actuating lever (44) in protection box (12), actuating lever (44) with protection box (12) rotate to be connected, second belt pulley (42) is fixed to be overlapped and is located on actuating lever (44), first belt pulley (41) and around being equipped with drive belt (43) on second belt pulley (42), actuating lever (44) are kept away from fixed cover is equipped with first bevel gear (45) on the tip of second belt pulley (42), third column spinner (35) are located fixed cover is equipped with second bevel gear (46) on the tip in protection box (12), first bevel gear (45) with second bevel gear (46) intermeshing.

7. A fracture viewer for supervision as claimed in claim 1 wherein: the protective device is characterized in that a first clamping block (121) is fixedly connected to the supporting tube (15), a second clamping block (122) is arranged on the protective box (12) in a sliding mode, inclined planes are arranged at the end portions, close to each other, of the first clamping block (121) and the second clamping block (122), and the first clamping block (121) is connected with the second clamping block (122) in a clamping mode.

8. A crack monitor for proctoring as defined in claim 7, wherein: a pull rod (123) penetrates through the end portion, close to the second clamping block (122), of the protection box (12) in a sliding mode, the pull rod (123) is fixedly connected with the second clamping block (122), a return spring (124) is sleeved on the pull rod (123) in a sliding mode, one end of the return spring (124) is fixedly connected with the second clamping block (122), and the other end of the return spring (124) is fixedly connected with the inner side wall of the protection box (12).