Concrete ecological frame carrying cart

By employing positioning blocks, inserts, slots, and baffle components in the concrete ecological frame transport trolley, the problem of rapid installation and disassembly of side panels and tail panels is solved, improving transport stability and practicality.

CN224145973UActive Publication Date: 2026-04-21GUANGDONG YUANTIAN ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG YUANTIAN ENG
Filing Date
2025-05-29
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The existing concrete ecological frame transport trolley is inconvenient to adjust the height of the side panels, has poor stability, and the side panel installation structure design is not convenient for quick assembly and disassembly, resulting in poor practicality.

Method used

The side panel is quickly installed by using a combination of positioning blocks and positioning grooves, insert blocks and slots, and card slots; the baffle is quickly positioned and its height is adjusted by using a combination of guide blocks, guide grooves, and limit rods; the baffle assembly is designed to facilitate baffle height adjustment and improve stability.

Benefits of technology

It enables rapid installation and disassembly of side panels and tail panels, as well as quick positioning and height adjustment of baffles, improving the handling stability and practicality of concrete ecological frames.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of hydraulic engineering, and discloses a concrete ecological frame carrying cart which comprises a carrying cart body, a fixing plate fixedly installed at the top end of the carrying cart body and a side plate arranged at the top end of the carrying cart body. A tail plate is arranged at the end, away from the fixing plate, of the side plate, a second inserting groove, a first limiting groove and a sliding groove are formed in the face, away from the side plate, of the tail plate, and a limiting block is slidably connected to the inner side of the sliding groove. According to the concrete ecological frame carrying cart, through cooperation of a first positioning block and a first positioning groove, cooperation of a first inserting block and a first inserting groove and cooperation of a first clamping groove and a second clamping groove, rapid installation of side plates can be achieved, through cooperation of a first baffle assembly and a second baffle assembly, a concrete ecological frame can be blocked conveniently, more concrete ecological frames can be carried, and during carrying, the concrete ecological frame is convenient to carry. And the concrete ecological frame is not prone to falling off, and the stability during carrying is improved.
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Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, specifically a concrete ecological frame transport cart. Background Technology

[0002] A concrete eco-frame is a frame structure made of precast concrete, primarily used for slope protection and ecological restoration. It features high strength, corrosion resistance, and durability, able to withstand the impact of water flow and waves, protecting the stability of the riverbank environment. A concrete eco-frame transport cart is a specialized tool for transporting and moving concrete eco-frames; it is typically modified from a handcart or manual transport vehicle and is mainly used for moving and transporting concrete eco-frame molds within the construction site.

[0003] Existing concrete eco-frame transport trolleys can effectively save manpower and improve transport efficiency when transporting concrete eco-frames. However, the existing technology is not convenient for adjusting the height of the side panels. When transporting a large number of concrete eco-frames, it is not convenient to block the concrete eco-frames. The overall stability is poor. In addition, the side panel installation structure is not designed, making it inconvenient to quickly disassemble and assemble during use or assembly. The practicality is poor and it is not convenient for widespread use. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a concrete ecological frame transport trolley, which can effectively solve the problems of existing technology, such as inconvenience in adjusting the height of the side panels, inconvenience in blocking the concrete ecological frames when transporting a large number of concrete ecological frames, poor overall stability, lack of side panel installation structure, inconvenience in quick disassembly and assembly during use or assembly, poor practicality, and inconvenience in promotion and use.

[0005] The technical solution adopted by this utility model is as follows: a concrete ecological frame transport trolley, including a transport trolley body and a fixing plate fixedly installed on the top of the transport trolley body, and a side plate provided on the top of the transport trolley body. A baffle assembly is provided at the end of the side plate away from the transport trolley body, and a tail plate is provided at the end of the side plate away from the fixing plate. A slot 2, a limiting groove 1, and a sliding groove are provided on the side of the tail plate away from the side plate. A limiting block is slidably connected to the inner side of the sliding groove. A positioning block 2 is fixedly installed at the end of the tail plate close to the transport trolley body. A positioning groove 2 is provided on the side of the transport trolley body close to the tail plate. An insert block 2 is fixedly installed at the end of the side plate close to the tail plate. A through groove is provided at the end of the insert block 2 away from the side plate. A baffle assembly 2 is provided at the end of the tail plate away from the transport trolley body.

[0006] Preferably, a positioning block is fixedly installed at the end of the side panel near the main body of the transport trolley, and an insert block is fixedly installed at the end of the side panel near the fixed plate. A slot is formed at the end of the insert block near the fixed plate. A positioning groove is formed on the side of the main body of the transport trolley near the side panel. A rotating plate is rotatably installed on the side of the fixed plate away from the side panel. A slot is formed on the side of the fixed plate near the side panel. A slot is formed at the end of the rotating plate away from the fixed plate. The positioning block and the positioning groove are plugged in, the insert block and the slot are plugged in, and the slots are compatible.

[0007] Using the above technical solution, the worker inserts positioning block one into positioning slot one and inserts insert block one into slot one. Then, the rotating plate is rotated so that slot one is engaged with slot two, which can realize the quick installation of the side panel. It is easy to quickly disassemble and assemble during use or assembly, and has high practicality.

[0008] Preferably, the baffle assembly includes a movable groove, a guide groove, a limiting groove, a baffle, a guide block, a limiting groove, and a limiting rod. The side plate has a movable groove and a guide groove at the end away from the trolley body. The outer wall of the side plate has a limiting groove. A baffle is provided on the inner side of the movable groove. A guide block is fixedly installed on the outer wall of the baffle. A limiting groove is provided at the end of the guide block near the side plate. A limiting rod that matches the limiting groove and the limiting groove is inserted into the outer wall of the side plate. The guide block and the guide groove are slidably connected. The limiting rod extends through the limiting groove and into the interior of the limiting groove.

[0009] With the above technical solution, the staff slides the guide block one inside the guide groove one. When it slides to the appropriate position, the staff then extends the limiting rod through the limiting groove two into the limiting groove three, which can realize the quick limiting of the baffle one. After long-term use, it is easy to repair or replace it, and it has high practicality.

[0010] Preferably, multiple identical limiting grooves are provided, and the multiple limiting grooves are distributed at equal intervals.

[0011] Through the above technical solution, the height of the baffle can be adjusted by the design of multiple limiting grooves, which can block the concrete ecological frame, making it easier to move more concrete ecological frames. During the movement, the concrete ecological frame is less likely to fall off, thus improving the stability during the movement.

[0012] Preferably, the second positioning block and the second positioning groove are plug-in installed, and the second insertion block and the second slot are plug-in installed.

[0013] Using the above technical solution, the staff inserts positioning block two into the interior of positioning slot two, and simultaneously inserts insert block two into the interior of slot two, which enables rapid positioning of the tail plate.

[0014] Preferably, the limiting groove, the through groove, and the sliding groove are connected, and the limiting block is adapted to the limiting groove.

[0015] With the above technical solution, after the tail plate is quickly positioned, the staff can slide the limiting block through the through groove into the inside of the chute, which can realize the quick positioning of the tail plate. During use or assembly, it is convenient to quickly disassemble and assemble it, and at the same time, it is convenient for the staff to unload the concrete ecological frame. It has high practicality.

[0016] Preferably, the second baffle assembly includes a second movable groove, a second guide groove, a gear, a second baffle, a second guide block, a rack, a fixed block, a movable groove, a toothed block, a spring, and a pull rod. The end of the tail plate away from the main body of the transport trolley has the second movable groove and the second guide groove. A gear is rotatably mounted on the inner side of the second movable groove. A second baffle is provided on the inner side of the second movable groove. A second guide block is fixedly mounted on the end of the second baffle away from the gear. A rack is fixedly mounted on the end of the second baffle near the gear. A fixed block is fixedly mounted on the end of the tail plate away from the main body of the transport trolley. A movable groove is provided on the inner side of the fixed block. A toothed block is slidably connected to the inner side of the movable groove. A spring and a pull rod are fixedly mounted on the end of the toothed block away from the gear. The gear and the rack are meshed. The toothed block is adapted to the gear. The second guide block and the second guide groove are slidably connected.

[0017] Using the above technical solution, the worker pulls the lever to disengage the toothed block from the outside of the gear, and then pulls the baffle two to make the guide block two slide inside the guide groove two. When it slides to the appropriate position, the lever is released, allowing the toothed block to engage with the outside of the gear. This enables the baffle two to be quickly positioned and also facilitates the adjustment of the height of the baffle two, making it easier to block the concrete ecological frame and move more concrete ecological frames. During transportation, the concrete ecological frame is less likely to fall, improving the stability during transportation.

[0018] Compared with the prior art, this utility model provides a concrete ecological frame transport trolley, which has the following beneficial effects:

[0019] 1. This concrete ecological frame transport trolley can quickly install the side panels by cooperating with positioning block one and positioning groove one, insert block one and slot one, and slot one and slot two. It can also quickly install the tail plate by cooperating with positioning block two and positioning groove two, insert block two and slot two, and limiting block, limiting groove one, through groove and sliding groove. At the same time, it is convenient for workers to unload the concrete ecological frame, which is highly practical.

[0020] 2. This concrete eco-frame transport trolley, through the cooperation of guide block one, guide groove one, and limiting rod, and limiting groove two and limiting groove three, can achieve rapid limiting of baffle one. After long-term use, it is easy to inspect or replace it, and has high practicality. The design of baffle component one makes it easy to adjust the height of baffle one, and the design of baffle component two makes it easy to adjust the height of baffle two. The cooperation of baffle component one and baffle component two makes it easy to block the concrete eco-frame, so as to transport more concrete eco-frames. During transportation, the concrete eco-frames are not easy to fall off, improving the stability during transportation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the installation structure of the baffle assembly of this utility model;

[0024] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a schematic diagram of the tailgate installation structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the side plate mounting structure of this utility model;

[0027] Figure 7 This is a schematic diagram of the installation structure of the baffle assembly II of this utility model. Figure 1 ;

[0028] Figure 8 This is a schematic diagram of the installation structure of the baffle assembly II of this utility model. Figure 2 .

[0029] The components include: 1. Cart body; 2. Fixing plate; 3. Side plate; 4. Positioning block one; 5. Insert block one; 6. Slot one; 7. Positioning slot one; 8. Turning plate; 9. Slot one; 10. Slot two; 11. Baffle assembly one; 1101. Movable slot one; 1102. Guide slot one; 1103. Limiting slot two; 1104. Baffle one; 1105. Guide block one; 1106. Limiting slot three; 1107. Limiting rod; 12. Tail plate; 13. Slot two ; 14. Limiting groove one; 15. Sliding groove; 16. Limiting block; 17. Positioning block two; 18. Positioning groove two; 19. Inserting block two; 20. Through groove; 21. Baffle assembly two; 2101. Movable groove two; 2102. Guide groove two; 2103. Gear; 2104. Baffle two; 2105. Guide block two; 2106. Rack; 2107. Fixed block; 2108. Moving groove; 2109. Tooth block; 2110. Spring; 2111. Pull rod. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] like Figure 1-8 As shown, the present invention provides a concrete ecological frame transport trolley, including a transport trolley body 1 and a fixing plate 2 fixedly installed on the top of the transport trolley body 1, and a side plate 3 provided on the top of the transport trolley body 1. A baffle assembly 11 is provided at the end of the side plate 3 away from the transport trolley body 1, and a tail plate 12 is provided at the end of the side plate 3 away from the fixing plate 2. A slot 13, a limiting groove 14 and a sliding groove 15 are provided on the side of the tail plate 12 away from the side plate 3. A limiting block 16 is slidably connected to the inner side of the sliding groove 15. A positioning block 17 is fixedly installed at the end of the tail plate 12 close to the transport trolley body 1. A positioning groove 18 is provided on the side of the transport trolley body 1 close to the tail plate 12. An insert block 19 is fixedly installed at the end of the side plate 3 close to the tail plate 12. A through groove 20 is provided at the end of the insert block 19 away from the side plate 3. A baffle assembly 21 is provided at the end of the tail plate 12 away from the transport trolley body 1.

[0033] Specifically, a positioning block 4 is fixedly installed on the side panel 3 near the end of the transport trolley body 1, and an insert block 5 is fixedly installed on the end of the side panel 3 near the fixed plate 2. A slot 6 is formed on the end of the insert block 5 near the fixed plate 2. A positioning groove 7 is formed on the side of the transport trolley body 1 near the side panel 3. A rotating plate 8 is rotatably installed on the side of the fixed plate 2 away from the side panel 3. A slot 9 is formed on the side of the fixed plate 2 near the side panel 3, and a slot 10 is formed on the end of the rotating plate 8 away from the fixed plate 2. The positioning block 4 and the positioning groove 7 are plugged into each other, as are the insert block 5 and the slot 9. The slot 6 and the slot 10 are compatible. The advantage is that the operator can quickly install the side panel 3 by inserting the positioning block 4 into the positioning groove 7 and simultaneously inserting the insert block 5 into the slot 9, then rotating the rotating plate 8 to engage the slot 6 with the slot 10. This allows for quick installation and disassembly of the side panel 3 during use or assembly, making it highly practical.

[0034] Specifically, the baffle assembly 11 includes a movable groove 1101, a guide groove 1102, a limiting groove 2 1103, a baffle 1104, a guide block 1105, a limiting groove 3 1106, and a limiting rod 1107. The side plate 3 has a movable groove 1101 and a guide groove 1102 at the end away from the trolley body 1. The outer wall of the side plate 3 has a limiting groove 2 1103. The baffle 1104 is provided on the inner side of the movable groove 1101. A guide block 1105 is fixedly installed on the outer wall of the baffle 1104. A limiting groove 1106 is formed at one end of the guide block 1105 near the side plate 3. A limiting rod 1107, compatible with limiting grooves 1103 and 1106, is inserted into the outer wall of the side plate 3. The guide block 1105 is slidably connected to the guide groove 1102. The limiting rod 1107 extends through the limiting groove 1103 into the limiting groove 1106. The advantage is that the operator can slide the guide block 1105 within the guide groove 1102, and when it reaches the appropriate position, the operator can then extend the limiting rod 1107 through the limiting groove 1103 into the limiting groove 1106, achieving rapid positioning of the baffle 1104. After prolonged use, it is easy to inspect or replace, making it highly practical.

[0035] Specifically, multiple identical limiting grooves 1103 are provided, and these multiple limiting grooves 1103 are distributed at equal intervals. The advantage is that, through the design of multiple limiting grooves 1103, the height of the baffle 1104 can be adjusted to block the concrete ecological frame, making it easier to move more concrete ecological frames. During transportation, the concrete ecological frame is less likely to fall, thus improving the stability during transportation.

[0036] Example 2:

[0037] like Figure 2-8As shown, as an improvement on the previous embodiment, to further facilitate the installation of the tailplate 12, specifically, the positioning block 17 and the positioning groove 18 are plugged in, and the insertion block 19 and the slot 13 are plugged in. The advantage is that the operator can quickly position the tailplate 12 by inserting the positioning block 17 into the positioning groove 18 and simultaneously inserting the insertion block 19 into the slot 13.

[0038] Specifically, the limiting groove 14, the through groove 20, and the sliding groove 15 are interconnected, and the limiting block 16 is adapted to the limiting groove 14. The advantage is that after the tail plate 12 is quickly positioned, the worker can slide the limiting block 16 through the through groove 20 into the sliding groove 15, achieving rapid positioning of the tail plate 12. This facilitates quick assembly and disassembly during use or assembly, and also makes it easier for workers to unload the concrete ecological frame, making it highly practical.

[0039] Specifically, the baffle assembly 21 includes a movable groove 2101, a guide groove 2102, a gear 2103, a baffle 2104, a guide block 2105, a rack 2106, a fixed block 2107, a moving groove 2108, a gear block 2109, a spring 2110, and a pull rod 2111. The tail plate 12, at the end furthest from the transport trolley body 1, has a movable groove 2101 and a guide groove 2102. A gear 2103 is rotatably mounted on the inner side of the movable groove 2101, and a baffle 2104 is provided on the inner side of the movable groove 2101. A guide rod 2105 is fixedly mounted on the end of the baffle 2104 furthest from the gear 2103. A rack 2106 is fixedly installed at one end of the second baffle 2104 near the gear 2103. A fixing block 2107 is fixedly installed at the end of the tail plate 12 away from the main body of the transport trolley 1. A moving groove 2108 is opened on the inner side of the fixing block 2107. A toothed block 2109 is slidably connected to the inner side of the moving groove 2108. A spring 2110 and a pull rod 2111 are fixedly installed at the end of the toothed block 2109 away from the gear 2103. The gear 2103 and the rack 2106 are meshed. The toothed block 2109 is adapted to the gear 2103. The second guide block 2105 and the second guide groove 2102 are slidably connected. The advantages are that when the worker pulls the lever 2111, the toothed block 2109 disengages from the outside of the gear 2103. Then, the baffle 2104 is pulled, causing the guide block 2105 to slide inside the guide groove 2102. When it slides to the appropriate position, the lever 2111 is released, causing the toothed block 2109 to engage with the outside of the gear 2103. This allows for quick positioning of the baffle 2104 and also facilitates adjustment of its height, making it easier to block the concrete ecological frame and move more concrete ecological frames. During transport, the concrete ecological frame is less likely to fall, improving stability during transport.

[0040] Working principle: During installation, the operator inserts positioning block 4 into positioning slot 7 and inserts block 5 into slot 9. Then, the rotating plate 8 is rotated, causing slot 6 to engage with slot 10, enabling quick installation of side plate 3. This facilitates rapid assembly and disassembly during use, making it highly practical. Next, positioning block 17 is inserted into positioning slot 18 and inserts block 19 into slot 13, enabling quick positioning of tail plate 12. After quickly positioning tail plate 12, the operator... The operator slides the limiting block 16 through the through groove 20 into the inside of the sliding groove 15, which can quickly limit the tail plate 12. This facilitates quick assembly and disassembly during use or assembly, and also makes it easy for workers to unload the concrete ecological frame, making it highly practical. Then, the operator inserts the positioning block 4 into the positioning groove 7 and the insert block 5 into the slot 9. Then, the rotating plate 8 is rotated so that the locking slot 6 engages with the locking slot 10, enabling the quick installation of the side plate 3. This also facilitates quick assembly and disassembly during use or assembly, making it highly practical. At a higher position, the operator slides guide block 1105 inside guide groove 1102. When it reaches the desired position, the operator extends limit rod 1107 through limit groove 2103 to limit groove 3106, enabling quick positioning of baffle 1104. This facilitates maintenance or replacement after prolonged use, making it highly practical. During use, the height of baffle 1104 can be adjusted via multiple limit grooves 2103. Simultaneously, the operator pulls lever 2111, disengaging gear block 2109 from the gear. On the outside of 2103, pull the second baffle 2104, so that the second guide block 2105 slides inside the second guide groove 2102. When it slides to the appropriate position, release the pull rod 2111, so that the tooth block 2109 engages with the outside of the gear 2103. This can realize the quick limiting of the second baffle 2104, and also facilitate the adjustment of the height of the second baffle 2104, which is convenient for blocking the concrete ecological frame and for moving more concrete ecological frames. During the transportation, the concrete ecological frame is not easy to fall, improving the stability during transportation and making it highly practical.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete ecological frame carrying trolley, comprising a carrying trolley body (1), a fixed plate (2) fixedly installed at the top end of the carrying trolley body (1), and a side plate (3) arranged at the top end of the carrying trolley body (1), characterized in that: A baffle assembly (11) is provided at the end of the side plate (3) away from the main body (1) of the transport trolley. A tail plate (12) is provided at the end of the side plate (3) away from the fixed plate (2). A slot (13), a limiting groove (14), and a sliding groove (15) are provided on the side of the tail plate (12) away from the side plate (3). A limiting block (16) is slidably connected to the inner side of the sliding groove (15). A positioning block (17) is fixedly installed at the end of the tail plate (12) close to the main body (1) of the transport trolley. A positioning groove (18) is provided on the side of the main body (1) close to the tail plate (12). An insert block (19) is fixedly installed at the end of the side plate (3) close to the tail plate (12). A through groove (20) is provided at the end of the insert block (19) away from the side plate (3). A baffle assembly (21) is provided at the end of the tail plate (12) away from the main body (1) of the transport trolley.

2. A concrete eco-frame transport trolley according to claim 1, characterised in that: A positioning block (4) is fixedly installed at one end of the side plate (3) near the main body (1) of the transport trolley. A plug block (5) is fixedly installed at one end of the side plate (3) near the fixed plate (2). A slot (6) is opened at one end of the plug block (5) near the fixed plate (2). A positioning groove (7) is opened on one side of the main body (1) near the side plate (3). A rotating plate (8) is rotatably installed on the side of the fixed plate (2) away from the side plate (3). A slot (9) is opened on one side of the fixed plate (2) near the side plate (3). A slot (10) is opened at one end of the rotating plate (8) away from the fixed plate (2). The positioning block (4) and the positioning groove (7) are plugged in. The plug block (5) and the slot (9) are plugged in. The slot (6) and the slot (10) are compatible.

3. A concrete eco-frame transport trolley as claimed in claim 1, wherein: The baffle assembly (11) includes a movable groove (1101), a guide groove (1102), a limiting groove (1103), a baffle (1104), a guide block (1105), a limiting groove (1106), and a limiting rod (1107). The side plate (3) has a movable groove (1101) and a guide groove (1102) at one end away from the trolley body (1). The outer wall of the side plate (3) has a limiting groove (1103). The inner side of the movable groove (1101) is provided with a baffle (1104). A guide block (1105) is fixedly installed on the outer wall of the baffle (1104). A limiting groove (1106) is opened at one end of the guide block (1105) near the side plate (3). A limiting rod (1107) that is compatible with the limiting groove (1103) and the limiting groove (1106) is inserted into the outer wall of the side plate (3). The guide block (1105) and the guide groove (1102) are slidably connected. The limiting rod (1107) extends through the limiting groove (1103) into the interior of the limiting groove (1106).

4. A concrete eco-frame transport trolley as claimed in claim 3, characterised in that: The limiting groove 2 (1103) has multiple identical openings, and the multiple limiting groove 2 (1103) are distributed at equal intervals.

5. A concrete eco-frame transport trolley as claimed in claim 1, wherein: The second positioning block (17) and the second positioning groove (18) are connected by a plug-in joint, and the second plug block (19) and the second slot (13) are connected by a plug-in joint.

6. A concrete eco-frame transport trolley as claimed in claim 1, wherein: The limiting groove (14), the through groove (20) and the sliding groove (15) are connected, and the limiting block (16) is adapted to the limiting groove (14).

7. A concrete eco-frame transport trolley as claimed in claim 1, wherein: The second baffle assembly (21) includes a second movable groove (2101), a second guide groove (2102), a gear (2103), a second baffle (2104), a second guide block (2105), a rack (2106), a fixed block (2107), a moving groove (2108), a gear block (2109), a spring (2110), and a pull rod (2111). The tail plate (12) has a second movable groove (2101) and a second guide groove (2102) at one end away from the main body (1). A gear (2103) is rotatably mounted on the inner side of the second movable groove (2101). A second baffle (2104) is provided on the inner side of the second movable groove (2101). A second guide block (2105) is fixedly mounted at the end of the second baffle (2104) away from the gear (2103). 2105), a rack (2106) is fixedly installed at one end of the baffle (2104) near the gear (2103), a fixing block (2107) is fixedly installed at one end of the tail plate (12) away from the trolley body (1), a moving groove (2108) is provided on the inner side of the fixing block (2107), a tooth block (2109) is slidably connected to the inner side of the moving groove (2108), a spring (2110) and a pull rod (2111) are fixedly installed at one end of the tooth block (2109) away from the gear (2103), the gear (2103) and the rack (2106) are meshed, the tooth block (2109) is adapted to the gear (2103), and the guide block (2105) and the guide groove (2102) are slidably connected.