Rectangular pier climbing form construction up-down platform climbing ladder with protective structure

Abstract

The application discloses a climbing ladder with a protection structure for rectangular pier climbing form construction upper and lower platforms, which comprises an outer shell and a gate plate, the lower surface of the outer shell is fixedly installed with a butt joint block, and the inner wall of the outer shell is fixedly installed with a walking plate; further comprising: an induction controller, which is fixedly installed on the inner wall of the gate plate and is connected with the automatic spray head through a Bluetooth signal. The climbing ladder with the protection structure for the rectangular pier climbing form construction upper and lower platforms, at the beginning, the clamping block is located outside the clamping groove under the action of the first magnet, at this time, the outer shell can be pushed to move in the direction of climbing the rectangular pier under the action of the wheel assembly during use, after being moved to the required position, the clamping block is pulled to make the tail end of the clamping block enter the corresponding clamping groove, at this time, the connecting block and the wheel assembly will not rotate, and the outer shell will not move, which is convenient for subsequent use.

Description

Technical Field

[0001] This invention relates to the field of rectangular pier climbing formwork technology, specifically a climbing ladder with a protective structure for ascending and descending platforms during the construction of rectangular pier climbing formwork. Background Technology

[0002] During the construction of rectangular climbing formwork, when workers are hoisting the climbing formwork, they need to go down from the upper platform to the lower platform. This requires workers to move up and down frequently. At this time, a 4.5-meter-high ladder can be set up on the first hoisting platform to effectively solve the problem of workers having to go up and down frequently and reduce the safety risks of working at heights.

[0003] For example, a connecting component for a safety ladder on a bridge pier, disclosed in CN208605122U, includes a connecting component body. One end of the connecting component body is connected to the safety ladder, and the other end is connected to the bridge pier. The connecting component body includes connectors, mounting components, and fixing components. One end of the mounting component is provided with a connector of an integral structure, which is steel in an "L" or "C" shape or a "hook" shape. The other end of the mounting component is provided with several fixing components of an integral structure, which are also steel in an "L" or "C" shape or a "hook" shape. This utility model not only enables simple, convenient, and quick installation and disassembly, and allows for repeated use, but also improves work efficiency, accelerates construction progress, saves resources and costs, and allows for standardized processing, thus reducing construction costs and minimizing potential quality issues.

[0004] For example, a multifunctional bridge inspection construction ladder with publication number CN216921998U includes a climbing frame body. A cleaning mechanism is fitted onto the surface of the climbing frame body. The cleaning mechanism includes a first fixing block, a second fixing block, and a third fixing block. A fourth fixing block is inserted inside the third fixing block. A telescopic rod is fixed to the side of the fourth fixing block away from the third fixing block, and a spring is fitted onto the surface of the telescopic rod. This invention, with its first fixing block and rubber scrapers, along with the second and third fixing blocks, enables the device to clean water stains and dirt from the surface of the climbing frame body, preventing users from slipping during use.

[0005] During the work process, staff need to move up and down, and after working for a long time, they will be very tired, which will affect their work efficiency. However, the device mentioned in the above application does not have a reminder function during use, which leads to a decrease in the work efficiency of staff and an increase in the danger of their work.

[0006] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing ladders used for ascending and descending platforms in the construction of rectangular pier climbing formwork. Summary of the Invention

[0007] The purpose of this invention is to provide a ladder with a protective structure for climbing formwork construction of rectangular piers, which solves the problem mentioned in the background art that the ladder lacks a reminder function during use, resulting in decreased work efficiency and increased danger for workers.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a climbing ladder for the upper and lower platforms of a rectangular pier climbing formwork construction with a protective structure, comprising an outer shell and a gate plate, wherein a connecting block is fixedly installed on the lower surface of the outer shell, and a walking plate is fixedly installed on the inner wall of the outer shell, and an overlapping block is fixedly installed on the lower surface of the connecting block, and a connecting block is rotatably arranged inside the overlapping block, while a wheel assembly is fixedly installed on the lower surface of the connecting block.

[0009] The gate plate is fixedly installed on the upper surface of the uppermost walking plate, and the gate plate is rotatably connected to the inside of the gate plate;

[0010] A climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure, further comprising:

[0011] A water storage tank is fixedly installed on the inner wall of the outer shell, and a connecting shaft is rotatably provided inside the water storage tank. A hose is fixedly installed on the lower surface of the water storage tank, and the hoses are symmetrically distributed about the center of the water storage tank. Meanwhile, a stirring blade is fixedly installed on the surface of the part of the connecting shaft located inside the water storage tank.

[0012] A fixed block, wherein an intermediate block is rotatably arranged inside the fixed block, and an automatic nozzle is fixedly installed at the end of the intermediate block, and the automatic nozzle corresponds one-to-one with the hose, and the automatic nozzle and the hose are fixedly connected.

[0013] The sensor controller is fixedly installed on the inner wall of the gate plate, and the sensor controller is connected to the automatic nozzle via Bluetooth signal.

[0014] Preferably, the lower surface of the docking block is concave, and a crossbar is fixedly installed on the inner wall of the docking block. A locking block is sleeved on the surface of the crossbar. Initially, under the action of the first magnet, the end of the locking block is located outside the slot.

[0015] Preferably, the surface of the connecting block has a slot corresponding to the locking block, and a first magnet is fixedly installed on both the surface of the locking block and the inner wall of the docking block. The magnetic poles of adjacent first magnets are opposite, and the cross-section of the locking block is an inverted "L" structure. During use, the outer shell can be pushed, causing it to move towards the rectangular block under the action of the wheel assembly. After moving to the desired position, the locking block can be pulled, causing the end of the locking block to enter the corresponding slot. At this time, the connecting block and the wheel assembly will not rotate, and the outer shell will not move, which facilitates subsequent use.

[0016] Preferably, the slots are distributed at equal angles on the surface of the connecting block, and the lower surface of the connecting block is raised. The equally distributed slots facilitate the cooperation between the block and the slots, making it easier for the connecting block to engage and connect with the mating block.

[0017] Preferably, the guardrails are symmetrically distributed about the center of the walking plate, and long pins are fixedly installed inside the guardrails, with the long pins passing through the interior of the gate plate and being rotatably connected to the gate plate. When the staff walks to the position of the gate plate, they can push the guardrails.

[0018] Preferably, a push rod is fixedly installed on the surface of the long pin, and a connecting rod corresponding to the push rod is fixedly installed on the lower surface of the middle block. The connecting rod is rotatably connected to the fixed block, and the cross section of the connecting rod is considered as an inverted "L" structure. When the railing is pushed, the railing drives the long pin and the push rod to rotate synchronously. Then, the push rod pushes the inverted "L" structure connecting rod. At this time, the connecting rod drives the middle block and the automatic nozzle to rotate, and the sensor controller will make the automatic nozzle work.

[0019] Preferably, a limiting block is fixedly installed on the surface of the connecting rod, and a second magnet is fixedly installed on both the surface of the limiting block and the inner wall of the fixing block. The inner wall of the fixing block has a limiting groove corresponding to the limiting block. When the connecting rod rotates, it also drives the limiting block to rotate inside the limiting groove. When the push rod does not contact the connecting rod, the connecting rod rotates back under the mutual repulsive magnetic force of the limiting block and the second magnet. Repeating the above process, the automatic nozzle makes a reciprocating circular motion. At this time, the spraying effect of the automatic nozzle is better, and the sprayed water mist can help the staff concentrate and improve safety.

[0020] Preferably, the magnetic poles of adjacent second magnets are the same, and the rotation angle of the limiting block is 0°~45°. The rotation angle of the limiting block restricts the rotation angle of the connecting rod, the intermediate block and the automatic nozzle, thus improving stability.

[0021] Preferably, a vertical rod is fixedly installed on the upper surface of the intermediate block, and a rack is fixedly installed at the end of the vertical rod. A gear corresponding to the rack is fixedly installed on the surface of the connecting shaft located on the outer part of the water tank, and the rack is arc-shaped when viewed from above. A leak-proof plate is fixedly installed on the surface of the connecting shaft. A cover plate is hinged to the side of the water tank. When the intermediate block rotates and turns, it drives the vertical rod and rack to rotate synchronously. When the rack rotates, it drives the connecting shaft to rotate inside the water tank through the gear. When the connecting shaft rotates, it drives the stirring blade to rotate synchronously. At this time, the water flow is agitated, so that scale will not accumulate inside the water tank, thus extending the overall service life of the device.

[0022] Preferably, the portion of the long pin located inside the gate plate is protruding, and a torsion spring that provides elastic reset is fixedly installed on the surface of the long pin. The other side of the torsion spring is fixedly connected to the inner wall of the gate plate. When the barrier is pushed and the barrier rotates the long pin, the long pin will stretch the torsion spring. After the worker crosses the barrier, the long pin and the barrier return to their original position under the action of the torsion spring, which is convenient for subsequent use.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the climbing ladder for the upper and lower platforms of the rectangular pier climbing formwork construction with protective structure adopts a novel structural design, the specific details of which are as follows:

[0024] (1) The ladder for climbing formwork construction of rectangular pier with protective structure is initially positioned with the end of the locking block located outside the slot under the action of the first magnet. During use, the outer shell can be pushed so that the outer shell moves towards the direction of climbing the rectangular pier under the action of the wheel assembly. After moving to the required position, the locking block is pulled so that the end of the locking block enters the corresponding slot. At this time, the connecting block and the wheel assembly will not rotate, and the outer shell will not move, which is convenient for subsequent use.

[0025] (2) The climbing ladder used for the upper and lower platforms of the rectangular pier climbing formwork construction with protective structure. When the workers push the railing, the sensor controller makes the automatic nozzle work and sprays water mist, which makes the workers concentrate and improves safety. When the railing is pushed and the railing drives the long pin to rotate, the long pin pushes the connecting rod through the push rod, and then the connecting rod drives the middle block and the automatic nozzle to rotate. After the workers pass the railing, the long pin and the railing return to their original position under the action of the torsion spring. At this time, the connecting rod, the middle block and the automatic nozzle return to their original position under the action of the mutual repulsion magnetic force of the limit block and the second magnet, and then the automatic nozzle makes a reciprocating circular motion. At this time, the working range of the automatic nozzle is wider and the working efficiency is higher.

[0026] (3) The ladder used for the upper and lower platforms of the rectangular pier climbing formwork construction with protective structure drives the vertical rod and rack to rotate synchronously when the middle block rotates and turns. When the rack rotates, it drives the connecting shaft to rotate inside the water tank through the gear. When the connecting shaft rotates, it drives the stirring blade to rotate synchronously. At this time, the water flow shakes, so that scale will not accumulate inside the water tank, thus extending the overall service life of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0028] Figure 2 This is a schematic diagram of the docking block and connecting block structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the card slot distribution structure of the present invention;

[0030] Figure 4 This is a schematic diagram of a partial left sectional view of the outer casing of the present invention;

[0031] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0032] Figure 6 This is a schematic diagram of the connection structure between the intermediate block and the automatic nozzle of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection structure between the limiting block and the second magnet of the present invention;

[0034] Figure 8 For the present invention Figure 4 Enlarged structural diagram at point B;

[0035] Figure 9 This is a top view of the rack structure of the present invention;

[0036] Figure 10 This is a side view of the gate panel structure of the present invention.

[0037] In the diagram: 1. Outer shell; 2. Connecting block; 3. Crossbar; 4. Locking block; 5. First magnet; 6. Overlapping block; 7. Wheel assembly; 8. Connecting block; 9. Walking plate; 10. Water tank; 11. Cover plate; 12. Gate plate; 13. Slot; 14. Guard plate; 15. Long pin; 16. Torsion spring; 17. Push rod; 18. Fixing block; 19. Connecting rod; 20. Limiting block; 21. Limiting groove; 22. Second magnet; 23. Intermediate block; 24. Automatic nozzle; 25. Vertical rod; 26. Connecting shaft; 27. Gear; 28. Rack; 29. ​​Leak-proof plate; 30. Hose; 31. Stirring blade; 32. Sensor controller. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1-10 The present invention provides a technical solution: a climbing ladder for the upper and lower platforms of a rectangular pier climbing formwork construction with a protective structure, including an outer shell 1 and a gate plate 12. A connecting block 2 is fixedly installed on the lower surface of the outer shell 1, and a walking plate 9 is fixedly installed on the inner wall of the outer shell 1. An overlapping block 6 is fixedly installed on the lower surface of the connecting block 2, and a connecting block 8 is rotatably arranged inside the overlapping block 6. At the same time, a wheel assembly 7 is fixedly installed on the lower surface of the connecting block 8. The gate plate 12 is fixedly installed on the upper surface of the uppermost walking plate 9, and a guardrail 14 is rotatably connected inside the gate plate 12.

[0040] A climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure, further comprising:

[0041] A water tank 10 is fixedly installed on the inner wall of the outer shell 1. A connecting shaft 26 is rotatably provided inside the water tank 10. A hose 30 is fixedly installed on the lower surface of the water tank 10. The hoses 30 are symmetrically distributed about the center of the water tank 10. Meanwhile, an agitator 31 is fixedly installed on the surface of the part of the connecting shaft 26 inside the water tank 10.

[0042] The fixing block 18 has an internally rotating intermediate block 23, and an automatic nozzle 24 is fixedly installed at the end of the intermediate block 23. The automatic nozzle 24 corresponds one-to-one with the hose 30, and the automatic nozzle 24 and the hose 30 are fixedly connected.

[0043] The sensor controller 32 is fixedly installed on the inner wall of the gate plate 12, and the sensor controller 32 is connected to the automatic nozzle 24 via Bluetooth signal.

[0044] The lower surface of the docking block 2 is concave, and a crossbar 3 is fixedly installed on the inner wall of the docking block 2. A locking block 4 is sleeved on the surface of the crossbar 3. A slot 13 corresponding to the locking block 4 is opened on the surface of the connecting block 8. A first magnet 5 is fixedly installed on the surface of the locking block 4 and the inner wall of the docking block 2. The magnetic poles of adjacent positions of the first magnet 5 are opposite. The cross section of the locking block 4 is an inverted "L" structure. The slots 13 are evenly distributed on the surface of the connecting block 8. The lower surface of the connecting block 8 is convex.

[0045] Initially, under the action of the first magnet 5, the end of the locking block 4 is located outside the slot 13. During use, the outer shell 1 can be pushed, and the outer shell 1 will move towards the rectangular block under the action of the wheel assembly 7. After moving to the required position, the locking block 4 can be pulled, so that the end of the locking block 4 enters the corresponding slot 13. At this time, the connecting block 8 and the wheel assembly 7 will not rotate, and the outer shell 1 will not move, which is convenient for subsequent use.

[0046] The guardrail 14 is symmetrically distributed about the center of the walking plate 9, and a long pin 15 is fixedly installed inside the guardrail 14. The long pin 15 passes through the inside of the gate plate 12, and the long pin 15 is rotatably connected to the gate plate 12.

[0047] A push rod 17 is fixedly installed on the surface of the long pin 15, and a connecting rod 19 corresponding to the push rod 17 is fixedly installed on the lower surface of the middle block 23. The connecting rod 19 is rotatably connected to the fixed block 18, and the cross section of the connecting rod 19 is considered to be an inverted "L" structure.

[0048] A limiting block 20 is fixedly installed on the surface of the connecting rod 19, and a second magnet 22 is fixedly installed on both the surface of the limiting block 20 and the inner wall of the fixing block 18. The inner wall of the fixing block 18 is provided with a limiting groove 21 that corresponds one-to-one with the limiting block 20. The magnetic poles of adjacent second magnets 22 are the same, and the rotation angle of the limiting block 20 is 0°~45°.

[0049] When the worker pushes the barrier 14, the sensor controller 32 activates the automatic sprinkler head 24, which sprays water mist to help the worker concentrate and improve safety. When the barrier 14 is pushed, causing the long pin 15 to rotate (the torsion spring 16 is stretched), the long pin 15 pushes the connecting rod 19 through the push rod 17. The connecting rod 19 then causes the intermediate block 23 and the automatic sprinkler head 24 to rotate inside the fixed block 18 (at this time, the limiting block 20 rotates inside the limiting groove 21, and the mutual repulsive magnetic force on the limiting block 20 increases). After the worker passes over the barrier 14, the long pin 15 and the barrier 14 return to their original positions under the action of the torsion spring 16. At this time, the connecting rod 19, the intermediate block 23, and the automatic sprinkler head 24 return to their original positions under the mutual repulsive magnetic force of the limiting block 20 and the second magnet 22. The automatic sprinkler head 24 then performs reciprocating circular motion, which expands the working range of the automatic sprinkler head 24 and increases its working efficiency.

[0050] A vertical rod 25 is fixedly installed on the upper surface of the intermediate block 23, and a rack 28 is fixedly installed at the end of the vertical rod 25. A gear 27 corresponding to the rack 28 is fixedly installed on the surface of the connecting shaft 26 located on the outer part of the water tank 10. The rack 28 is arc-shaped when viewed from above. A leak-proof plate 29 is fixedly installed on the surface of the connecting shaft 26. A cover plate 11 is hinged to the side of the water tank 10.

[0051] The portion of the long pin 15 located inside the gate plate 12 is protruding, and a torsion spring 16 that plays an elastic reset role is fixedly installed on the surface of the long pin 15, and the other side of the torsion spring 16 is fixedly connected to the inner wall of the gate plate 12.

[0052] When the intermediate block 23 rotates and turns, it drives the vertical rod 25 and the rack 28 to rotate synchronously. When the rack 28 rotates, it drives the connecting shaft 26 to rotate inside the water tank 10 through the gear 27. When the connecting shaft 26 rotates, it drives the stirring blade 31 to rotate synchronously. At this time, the water flow is agitated, so that scale will not accumulate inside the water tank 10, thus extending the overall service life of the device. After the water in the water tank 10 is used up, the cover plate 11 can be opened to add water to the water tank 10, ensuring the smooth operation of the automatic nozzle 24 (the hose 30 plays the role of water supply).

[0053] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0054] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ladder for climbing formwork construction of a rectangular pier with a protective structure, comprising an outer shell (1) and a gate plate (12), wherein a connecting block (2) is fixedly installed on the lower surface of the outer shell (1), and a walking plate (9) is fixedly installed on the inner wall of the outer shell (1), and an overlapping block (6) is fixedly installed on the lower surface of the connecting block (2), and a connecting block (8) is rotatably arranged inside the overlapping block (6), and a wheel assembly (7) is fixedly installed on the lower surface of the connecting block (8). The gate plate (12) is fixedly installed on the upper surface of the uppermost walking plate (9), and the gate plate (12) is rotatably connected to the inside of the gate plate (12). Its features are, Also includes: A water tank (10) is fixedly installed on the inner wall of the outer shell (1), and a connecting shaft (26) is rotatably provided inside the water tank (10). A hose (30) is fixedly installed on the lower surface of the water tank (10), and the hose (30) is symmetrically distributed about the center of the water tank (10). Meanwhile, a stirring blade (31) is fixedly installed on the surface of the part of the connecting shaft (26) inside the water tank (10). A fixed block (18) is provided with an intermediate block (23) inside the fixed block (18) and an automatic nozzle (24) is fixedly installed at the end of the intermediate block (23). The automatic nozzle (24) corresponds one-to-one with the hose (30) and the automatic nozzle (24) is fixedly connected to the hose (30). The sensor controller (32) is fixedly installed on the inner wall of the gate plate (12), and the sensor controller (32) is connected to the automatic nozzle (24) via Bluetooth signal. The guardrail (14) is symmetrically distributed about the center of the walking plate (9), and a long pin (15) is fixedly installed inside the guardrail (14). The long pin (15) passes through the inside of the gate plate (12), and the long pin (15) is rotatably connected to the gate plate (12). A push rod (17) is fixedly installed on the surface of the long pin (15), and a connecting rod (19) corresponding to the push rod (17) is fixedly installed on the lower surface of the middle block (23). The connecting rod (19) is rotatably connected to the fixed block (18), and the cross section of the connecting rod (19) is considered as an inverted "L" structure. The connecting rod (19) is fixedly mounted with a limiting block (20), and a second magnet (22) is fixedly mounted on the surface of the limiting block (20) and the inner wall of the fixing block (18). The inner wall of the fixing block (18) is provided with a limiting groove (21) corresponding to the limiting block (20).

2. The climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure as described in claim 1, characterized in that: The lower surface of the docking block (2) is concave, and a crossbar (3) is fixedly installed on the inner wall of the docking block (2), and a locking block (4) is sleeved on the surface of the crossbar (3).

3. The climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure as described in claim 2, characterized in that: The surface of the connecting block (8) is provided with a slot (13) corresponding to the card block (4), and a first magnet (5) is fixedly installed on the surface of the card block (4) and the inner wall of the docking block (2). The magnetic poles of adjacent positions of the first magnets (5) are opposite, and the cross section of the card block (4) is an inverted "L" structure.

4. The climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure as described in claim 3, characterized in that: The slots (13) are distributed at equal angles on the surface of the connecting block (8), and the lower surface of the connecting block (8) is raised.

5. A climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure, as described in claim 1, is characterized in that: The adjacent magnetic poles of the second magnet (22) are the same, and the rotation angle of the limiting block (20) is 0°~45°.

6. The climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure according to claim 1, characterized in that: A vertical rod (25) is fixedly installed on the upper surface of the intermediate block (23), and a rack (28) is fixedly installed at the end of the vertical rod (25). A gear (27) corresponding to the rack (28) is fixedly installed on the surface of the connecting shaft (26) located on the outer part of the water tank (10). The rack (28) is arc-shaped when viewed from above. A leak-proof plate (29) is fixedly installed on the surface of the connecting shaft (26). A cover plate (11) is hinged to the side of the water tank (10).

7. A climbing ladder for ascending and descending platforms in the construction of a rectangular pier climbing formwork with a protective structure, as described in claim 5, is characterized in that: The portion of the long pin (15) located inside the gate plate (12) is protruding, and a torsion spring (16) that plays an elastic reset role is fixedly installed on the surface of the long pin (15), and the other side of the torsion spring (16) is fixedly connected to the inner wall of the gate plate (12).

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