Lightweight concrete brick water permeability detection device

Abstract

The invention relates to the technical field of new material detection, and discloses a lightweight concrete brick water permeability detection device. The device comprises an outer box, a tray, a movable frame, a sealing ring, a measuring cylinder, a driving assembly, a switching assembly, a first transmission assembly and a second transmission assembly, a motor drives a gear for transmission, automatic lifting of bricks is achieved in cooperation with a switching assembly, a ratchet block and a ratchet groove complete limiting, a large gear is switched to be meshed with a toothed plate subsequently, and a sealing ring is driven to extrude waterproof sealing putty to complete tight sealing. The device realizes automation of the whole process of brick positioning, sealing and detection, side water leakage is avoided, the accuracy and efficiency of detection data are improved, the sealing ring is convenient to disassemble and clean, the batch detection requirement is met, and the device is suitable for a water permeability detection scene of the lightweight concrete brick.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, and in particular to a device for testing the permeability of lightweight concrete bricks. Background Technology

[0002] Lightweight concrete bricks, as a new building material, are widely used in permeable pavements in municipalities and gardens due to their lightweight, environmental friendliness, and moderate strength. Permeability is a core performance indicator: in municipal roads, they allow rainwater to drain quickly and prevent waterlogging, while in gardens, they help retain soil moisture. Therefore, accurate testing of permeability is crucial for ensuring project quality, maximizing the functionality of green building materials, and significantly improving the durability of infrastructure.

[0003] Existing permeability testing devices have significant drawbacks: they rely on manual positioning of bricks, manual control of water injection, and data recording, making the process cumbersome and inefficient, and difficult to adapt to batch testing; more importantly, they have poor sealing performance, with the sealing structure not fitting tightly to the bricks, allowing water to easily leak from the gaps between the bricks and the device during testing. This leaked water, without penetrating through the bricks, is misjudged as permeable, directly leading to distorted test data that cannot accurately reflect the true permeability of the bricks, seriously affecting the reliability of the test results. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing testing devices have the disadvantages of cumbersome procedures and poor sealing. To address this, we propose a device for testing the permeability of lightweight concrete bricks.

[0005] To achieve the above objectives, this application adopts the following technical solution: a lightweight concrete brick permeability testing device, comprising an outer box and a tray movably disposed below the outer box. Movable frames are fixedly connected to both sides of the top of the tray, and the movable frames extend upward into the interior of the outer box. A sealing ring is movably installed at the bottom of the outer box. The interior of the sealing ring has a downward-opening and annular filling cavity. A sealing ring is slidably connected to the upper part of the filling cavity. Movable rods that penetrate the sealing ring upward are evenly distributed on the top of the sealing ring. A pressure ring is connected to the top of the movable rods. A measuring cylinder is disposed above the outer box. The outside of the measuring cylinder is threadedly connected to the inner wall of the sealing ring. The measuring cylinder is a cylinder that penetrates from top to bottom.

[0006] The outer casing also houses a drive assembly, a switching assembly, a first transmission assembly, and a second transmission assembly. The outer casing has a movable slot corresponding to the drive assembly. The drive assembly includes a motor base slidably connected to the lower part of the movable slot. A motor is fixedly connected to the top of the motor base. An outer frame rotatably mounts on the motor output shaft. Inside the outer frame are a first spur gear and a second spur gear. The first spur gear is fixedly connected to the motor output shaft. Chains are fitted around the first and second spur gears. A large gear is rotatably connected to the outer frame via a shaft. The large gear is fixedly connected to the second spur gear via a shaft. The outer casing also has a third slide groove. The switching assembly includes a trigger rod and a pressure plate sliding within the third slide groove. The trigger rod and pressure plate are fixedly connected. The bottom of the trigger rod extends through and to the bottom of the outer casing. A pressure plate corresponding to the pressure plate is located on the side of the motor base. The first transmission assembly includes a toothed groove located inside the movable frame, corresponding to the large gear. The outer casing has a second slide groove. The second transmission assembly includes a toothed plate slidably mounted inside the second slide groove, with the inner side of the toothed plate corresponding to the large gear and the bottom of the toothed plate corresponding to the top of the pressure ring.

[0007] Preferably, the outer casing has a through groove for the movable frame, a first magnetic ring is fitted on the outside of the sealing ring, and a second magnetic ring corresponding to the first magnetic ring is fitted on the inner wall of the lower part of the outer casing. The sealing ring is fixed by the attraction between the second magnetic ring and the first magnetic ring. The inner cavity is filled with waterproof sealant to seal the contact surface between the sealing ring and the brick. The sealing ring is detachable to facilitate the filling of waterproof sealant and subsequent cleaning.

[0008] Preferably, the bottom of the sealing ring is provided with bases on both sides to increase the contact area with the bricks, and the bases are located at the bottom of the outer box to avoid the bricks contacting the bottom of the outer box and affecting the contact sealing between the bases and the bricks.

[0009] Preferably, a valve is installed near the bottom of the measuring cylinder to control the flow of water inside the measuring cylinder, a water inlet is provided on the top edge of the measuring cylinder, and two sets of measuring components are provided on the measuring cylinder.

[0010] Preferably, the measuring components include a photoelectric sensor timer and a light source arranged opposite each other, the light source being used to provide stable illumination, and the photoelectric sensor timer being used to monitor changes in the liquid level and to keep track of time.

[0011] Preferably, the cross-section of the extrusion plate is an inverted right triangle, the cross-section of the pressure plate is a right triangle, and the inclined surfaces of the extrusion plate and the pressure plate correspond to each other. A first reset spring is provided between the trigger rod and the top of the extrusion plate and the second slide groove.

[0012] Preferably, the toothed plate has an L-shaped cross-section, and a second return spring is provided between the toothed plate and the inner wall of the top of the second groove.

[0013] Preferably, the outer casing is further provided with a first slide groove, the first slide groove is provided with a ratchet block, and the outer side of the movable frame is provided with a ratchet groove corresponding to the ratchet block.

[0014] Preferably, the cross-section of each tooth and groove on the ratchet groove and ratchet block is a right-angled triangle. The ratchet block is used to limit the movement of the movable frame and prevent the pallet and movable frame from moving downward after the large gear disengages from the groove.

[0015] Preferably, a reset rod is fixedly connected to the outside of the ratchet block, the reset rod extends and penetrates to the outside of the outer casing, and a compression spring is provided between the ratchet block and the inner wall of the first slide groove.

[0016] The technical effects and advantages of this invention are as follows:

[0017] In this invention, the detachable sealing ring, combined with magnetic fixation and an automatic sealing structure that uses a sealing ring to compress waterproof sealant, completely solves the problem of poor sealing in traditional devices, preventing water leakage from the side and ensuring the authenticity and reliability of test data. The drive and switching components automatically complete the lifting of the bricks and transmission switching, and with the ratchet block for unidirectional limiting, it replaces manual positioning operations, greatly improving testing efficiency. At the same time, the measuring cylinder is equipped with an automated monitoring combination of photoelectric sensor timer and light source, eliminating the need for manual timing and recording, accurately capturing liquid level change data, and reducing human error. The overall structural design takes into account the ease of operation, the sealing ring is easy to disassemble and clean, and the reset rod can quickly release the limit to reset the device, thus balancing testing accuracy, efficiency, and maintenance convenience. Attached Figure Description

[0018] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a front view of the overall structure of the present invention;

[0021] Figure 3 This is an exploded view of the overall structure of the present invention;

[0022] Figure 4 This is a cross-sectional view of the sealing ring structure of the present invention;

[0023] Figure 5 This is a structurally exploded view of the outer casing of the present invention;

[0024] Figure 6 This is a partial structural cross-sectional view of the present invention;

[0025] Figure 7This is a schematic diagram of the drive assembly, switching assembly, first transmission assembly, and second transmission assembly of the present invention;

[0026] Figure 8 This is an exploded view of the drive component and switching component structure of the present invention.

[0027] Legend: 1. Outer casing; 2. Tray; 3. Movable frame; 4. Sealing ring; 5. Base; 6. Filling cavity; 7. Sealing ring; 8. Movable rod; 9. Pressure ring; 10. First magnetic ring; 11. Second magnetic ring; 12. Measuring cylinder; 13. Valve; 14. Photoelectric sensor timer; 15. Light source; 16. Water inlet; 17. Movable groove; 18. Motor base; 19. Motor; 20. First spur gear; 21. Outer frame; 22. Chain; 23. Second spur gear; 24. Large gear; 25. Trigger rod; 26. Squeezing plate; 27. First return spring; 28. Pressure plate; 29. ​​Toothed plate; 30. Second return spring; 31. Tooth groove; 32. Racket groove; 33. Racket block; 34. Return rod; 35. Compression spring; 36. First slide groove; 37. Second slide groove; 38. Third slide groove. Detailed Implementation

[0028] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0029] Please see Figures 1-3 This invention provides a device for testing the permeability of lightweight concrete bricks, comprising an outer casing 1 and a tray 2 movably disposed below the outer casing 1; movable frames 3 are fixedly connected to the top two sides of the tray 2, and the movable frames 3 extend upward into the interior of the outer casing 1; a sealing ring 4 is movably installed at the bottom of the outer casing 1, and the interior of the sealing ring 4 has a downward-opening and annular filling cavity 6; a sealing ring 7 is slidably connected to the upper part of the interior of the filling cavity 6, and movable rods 8 are evenly distributed on the top of the sealing ring 7, extending upward through the sealing ring 4, and a pressure ring 9 is connected to the top of the movable rods 8; a measuring cylinder 12 is disposed above the outer casing 1, and the exterior of the measuring cylinder 12 is threadedly connected to the inner wall of the sealing ring 4, and the measuring cylinder 12 is a cylinder extending vertically.

[0030] Please see Figures 6-8The outer casing 1 also houses a drive assembly, a switching assembly, a first transmission assembly, and a second transmission assembly. The outer casing 1 contains a movable slot 17 corresponding to the drive assembly. The drive assembly includes a motor base 18 slidably connected to the lower part of the movable slot 17, and a motor 19 fixedly connected to the top of the motor base 18. An outer frame 21 rotatably mounts on the output shaft of the motor 19. Inside the outer frame 21 are a first spur gear 20 and a second spur gear 23. The first spur gear 20 is fixedly connected to the output shaft of the motor 19, and a chain 22 is fitted around the first spur gear 20 and the second spur gear 23. A large gear 24 rotatably mounts on the outside of the outer frame 21 via a shaft, and the large gear 24 communicates with the second spur gear 23. The shaft is fixedly connected; the outer casing 1 is also provided with a third slide groove 38. The switching component includes a trigger rod 25 and a pressing plate 26 that slide inside the third slide groove 38. The trigger rod 25 and the pressing plate 26 are fixedly connected. The bottom of the trigger rod 25 passes through and extends to the bottom of the outer casing 1. The side of the motor base 18 is provided with a pressure plate 28 corresponding to the pressing plate 26. The first transmission component includes a toothed groove 31 set inside the movable frame 3. The toothed groove 31 corresponds to the large gear 24. The outer casing 1 is provided with a second slide groove 37. The second transmission component includes a toothed plate 29 that slides inside the second slide groove 37. The inner side of the toothed plate 29 corresponds to the large gear 24. The bottom of the toothed plate 29 corresponds to the top of the pressure ring 9.

[0031] In a preferred embodiment, please refer to Figures 4-6 The outer casing 1 has a pre-reserved through slot for the movable frame 3; a first magnetic ring 10 is fitted onto the outside of the sealing ring 4, and a second magnetic ring 11 corresponding to the first magnetic ring 10 is fitted onto the inner wall of the lower part of the outer casing 1. The sealing ring 4 is fixed by the attraction between the second magnetic ring 11 and the first magnetic ring 10, which are opposite in polarity; this magnetic fixing method makes the installation and removal of the sealing ring 4 more convenient; the inner cavity 6 is filled with waterproof sealant to seal the contact surface between the sealing ring 4 and the brick; the sealing ring 4 is detachable, which facilitates the filling of waterproof sealant and subsequent cleaning, ensuring the ease of maintenance of the device.

[0032] In another preferred embodiment, please refer to Figure 4 The sealing ring 4 has bases 5 on both sides below the bottom to increase the contact area with the bricks, thereby improving the sealing effect. The bases 5 are located below the bottom of the outer box 1 to prevent the bricks from contacting the bottom of the outer box 1 and affecting the contact sealing between the bases 5 and the bricks, thus ensuring the reliability of the seal.

[0033] In a further preferred embodiment, please refer to Figure 3A valve 13 is installed near the bottom of the measuring cylinder 12 to control the flow of water inside the measuring cylinder 12, so as to accurately control the water head pressure and start timing; a water inlet 16 is provided on the top edge of the measuring cylinder 12 to facilitate the filling of water into the measuring cylinder 12; two sets of measuring components are provided on the measuring cylinder 12 to achieve accurate monitoring of the liquid level drop process.

[0034] In yet another preferred embodiment, please refer to Figure 3 The measuring components include a photoelectric sensor timer 14 and a light source 15 arranged opposite each other; the light source 15 is used to provide stable illumination to ensure that the photoelectric sensor timer 14 can accurately detect the liquid level; the photoelectric sensor timer 14 is used to monitor changes in the liquid level and keep track of time. When the liquid level passes through two preset heights, the time is automatically recorded, thereby calculating the permeability coefficient, realizing the automation and high precision of the measurement.

[0035] In yet another preferred embodiment, please refer to Figure 8The cross-section of the extrusion plate 26 is an inverted right-angled triangle, and the cross-section of the pressure plate 28 is also a right-angled triangle, with the inclined surfaces of the extrusion plate 26 and the pressure plate 28 corresponding to each other. This structural design allows the extrusion plate 26 to push the pressure plate 28 outward through the inclined surface force when it moves upward, thereby controlling the lateral movement of the drive assembly. A first return spring 27 is provided between the trigger rod 25 and the top of the extrusion plate 26 and the third slide groove 38. In its initial state, the first return spring 27 is at its maximum length. In this state, the motor base 18 is located inside and outside the movable slot 17; the motor 19 rotates clockwise. Due to the transmission friction between the first spur gear 20, the outer frame 21, and the chain 22, the motor 19 will drive the entire outer frame 21, chain 22, second spur gear 23, and large gear 24 to rotate clockwise and contact the tooth groove 31 on the inner side of the movable frame 3; when the outer frame 21, chain 22, second spur gear 23, and large gear 24 can no longer rotate, the first spur gear 20, chain 22, second spur gear 23, and large gear 24 will ... Gear 23 and large gear 24 rotate. Large gear 24 meshes with tooth groove 31, causing movable frame 3 to move upwards, thus moving the test brick on movable frame 3 upwards. When movable frame 3 presses trigger rod 25, causing trigger rod 25 and pressing plate 26 to move upwards, the first return spring 27 contracts. At this point, pressing plate 26 no longer presses against pressure plate 28, and the drive assembly moves inwards under the reaction force until large gear 24 completely disengages from tooth groove 31. (Outer frame 21, chain 22, second spur gear 23) The large gear 24 continues to rotate clockwise until it approaches the toothed plate 29. After the large gear 24 contacts and meshes with the toothed plate 29, the drive assembly moves outward to reset. Even so, the large gear 24 can still mesh with the toothed plate 29. As the motor 19 continues to drive, the large gear 24 drives the toothed plate 29 to move downward. The toothed plate 29 presses down on the pressure ring 9, so that the sealing ring 7 presses the waterproof sealant filling the inner cavity 6 between the brick and the base 5 to complete the seal, thus realizing the automatic rising and positioning and automatic sealing functions of the brick.

[0036] In a further preferred embodiment, please refer to Figures 6-7 The toothed plate 29 has an L-shaped cross-section. A second return spring 30 is provided between the toothed plate 29 and the inner wall of the top of the second slide groove 37. After sealing, the spring can automatically reset the toothed plate 29 when the motor reverses or stops driving, so as to prepare for the next operation.

[0037] In yet another preferred embodiment, please refer to Figures 6-7 The outer box 1 is also provided with a first slide groove 36, and a ratchet block 33 is provided inside the first slide groove 36; the outer side of the movable frame 3 is provided with a ratchet groove 32 corresponding to the ratchet block 33.

[0038] In a further preferred embodiment, the cross-section of each tooth and groove unit on the ratchet groove 32 and ratchet block 33 is a right-angled triangle. This right-angled triangular tooth design allows the ratchet block 33 to lock the movable frame 3 in one direction, preventing it from falling unexpectedly after being subjected to force or the drive component disengages. The ratchet block 33 is used to limit the movable frame 3, preventing the tray 2 and the movable frame 3 from moving downward after the large gear 24 disengages from the groove 31, thereby ensuring the stability and safety of the device during the sealing process.

[0039] In another preferred embodiment, a reset rod 34 is fixedly connected to the outer side of the ratchet block 33. The reset rod 34 extends and penetrates to the outside of the outer casing 1, making it convenient for the operator to manually control the disengagement of the ratchet block 33. A compression spring 35 is provided between the ratchet block 33 and the inner wall of the first slide groove 36. After the reset rod 34 is released, the compression spring 35 can automatically push the ratchet block 33 into the ratchet groove 32 to achieve automatic locking.

[0040] Working principle:

[0041] Before starting work, place the saturated lightweight concrete bricks on tray 2; remove the sealing ring 4 from the bottom of the outer box 1, fill the inner cavity 6 with waterproof sealant, and then reinstall it.

[0042] When the starting device is activated, motor 19 rotates clockwise; large gear 24 revolves accordingly and meshes with the toothed groove 31 on the inner side of movable frame 3, driving movable frame 3 to lift pallet 2 and bricks together; in the final stage of lifting, the bricks on movable frame 3 continuously press trigger rod 25, causing it to move pressing plate 26 upward along third slide groove 38, compressing first reset spring 27; after pressing plate 26 moves upward, pressure plate 28 is no longer restricted in position, and there will be a reaction force when the drive assembly drives movable frame 3 to rise. Under the reaction force of the drive assembly, the entire drive assembly slides synchronously inward along movable groove 17. At this time, the drive assembly can still drive movable frame 3 to rise.

[0043] When the brick rises to the point where it is tightly pressed against the base 5 at the bottom of the sealing ring 4, the trigger rod 25 and the pressing plate 26 reach the end of their stroke, and the drive assembly slides to the inner limit position, causing the large gear 24 to completely disengage from the tooth groove 31, and the large gear 24 enters a revolution state; subsequently, the revolving large gear 24 meshes with the tooth plate 29, and even if the drive assembly moves to the outside to reset under the reaction force, the large gear 24 and the tooth plate 29 can still maintain the meshing state;

[0044] The motor 19 continues to drive, and the large gear 24 drives the toothed plate 29 to move downward against the elastic force of the second return spring 30; the toothed plate 29 presses down on the pressure ring 9, and the pressure ring 9 pushes the sealing ring 7 to move downward in the filling cavity 6 through the movable rod 8, squeezing the waterproof sealant between the upper surface of the brick and the sealing ring 4 to form a seal;

[0045] After sealing, water is injected through the inlet 16 at the top of the measuring cylinder 12; the valve 13 is opened, and water permeates the brick body under a constant water head; the opposing light source 15 and photoelectric sensor timer 14 constitute a monitoring system, and the permeability coefficient of the brick can be automatically calculated by monitoring the time it takes for the liquid surface to pass through two predetermined positions.

[0046] After the test, manually pull the reset rod 34 outward to disengage the ratchet block 33 from the ratchet groove 32, and the movable frame 3 will descend and reset under the action of gravity; the toothed plate 29 will reset upward under the action of the second reset spring 30, and the motor 19 will reverse; finally, the removable sealing ring 4 will be cleaned and the sealing material will be replenished for the next use.

[0047] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A lightweight concrete block water permeability detection device, characterized by, The utility model provides a kind of water level measuring device for brick, including outer box and movable tray set below outer box, the top both sides of movable tray are fixedly connected with movable frame, movable frame extends to the inside of outer box upwards, the bottom of outer box movably installs sealing ring, the inside of sealing ring is equipped with downwardly open and annular filling cavity, the inside of filling cavity is slidably connected with sealing ring on top, sealing ring top is evenly distributed with movable rod upwards through sealing ring, movable rod top is connected with pressure ring, the upper portion of outer box is provided with measuring cylinder, the outer portion of measuring cylinder is threadedly connected with sealing ring inner wall, measuring cylinder is the cylinder body that penetrates up and down, the inside of outer box is also equipped with driving assembly, switching assembly, first transmission assembly and second transmission assembly, the inside of outer box is equipped with movable slot corresponding with driving assembly, driving assembly includes motor base slidably connected in the inside below movable slot, motor base top is fixedly connected with motor, motor output shaft is rotatably equipped with outer frame, the inside of outer frame is equipped with first straight gear and second straight gear, first straight gear is fixedly connected with motor output shaft, first straight gear and second straight gear are externally sleeved with chain, outer frame is rotatably connected with large gear outside by shaft, large gear is fixedly connected with second straight gear by shaft;The inside of outer box is also equipped with third sliding groove, switching assembly includes trigger lever and extrusion plate slidably in third sliding groove, trigger lever and extrusion plate are fixedly connected, trigger lever bottom penetrates and extends to the below of outer box, the side of motor base is equipped with pressure plate corresponding with extrusion plate, the first transmission assembly includes tooth slot arranged in the inner side of movable frame, tooth slot corresponds with large gear, the inside of outer box is provided with second sliding groove, the second transmission assembly includes tooth plate slidably arranged in the inside of second sliding groove, the inner side of tooth plate corresponds with large gear, the bottom of tooth plate corresponds with the top of pressure ring. The inside of outer box is reserved through groove that movable frame moves, the outside of sealing ring is embeddedly installed with first magnetic ring, the inside lower wall of outer box is embeddedly installed with second magnetic ring corresponding with first magnetic ring, sealing ring is fixed by the heteronormous attraction of second magnetic ring and first magnetic ring, the inside of filling cavity is filled with waterproof sealing putty, to seal the contact surface of sealing ring and brick.

2. The lightweight concrete block water permeability detection device according to claim 1, characterized in that: The bottom of sealing ring is equipped with base below both sides, to increase the contact area between sealing ring and brick, and base is located at the position below the bottom of outer box, to avoid the contact between brick and the bottom of outer box affecting the contact sealing property between base and brick.

3. The lightweight concrete block water permeability detection device according to claim 1, characterized in that: Valve is installed on the position close to the bottom of measuring cylinder, to control the flow state of water in measuring cylinder, the top edge of measuring cylinder is provided with water inlet, and two groups of measuring assemblies are arranged on measuring cylinder.

4. The lightweight concrete block water permeability detection device according to claim 3, characterized in that: The measuring assembly includes photoelectric sensing timer and light source arranged oppositely, the light source is used to provide stable illumination, and the photoelectric sensing timer is used to monitor liquid level change and time.

5. The lightweight concrete block water permeability detection device according to claim 1, characterized in that: The cross section of extrusion plate is inverted right triangle, the cross section of pressure plate is right triangle, and the inclined surfaces of extrusion plate and pressure plate correspond, and first return spring is arranged between the top of trigger lever and extrusion plate and second sliding groove.

6. The lightweight concrete block water permeability detection device according to claim 1, characterized in that: The cross section of tooth plate is L-shaped, and second return spring is arranged between the top of tooth plate and the inner wall of second sliding groove.

7. The lightweight concrete block water permeability detection device according to claim 6, characterized in that: ​ 8. The lightweight concrete block water permeability detection device according to claim 7, characterized in that: The inner part of the outer box is also provided with a first sliding groove, and the inner part of the first sliding groove is provided with a ratchet block.

9. The lightweight concrete block water permeability detection device according to claim 8, characterized in that: The cross section of each unit of the teeth and the groove on the ratchet groove and the ratchet block is a right triangle, the ratchet block is used for limiting the movable frame, and after the large gear is separated from the tooth groove, the tray and the movable frame are prevented from being displaced downward.

10. The lightweight concrete block water permeability detection device according to claim 9, characterized in that: The outer side of the ratchet block is fixedly connected with a reset rod, the reset rod extends and penetrates to the outside of the outer box, and a compression spring is arranged between the ratchet block and the inner wall of the first sliding groove.

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