Modular gemstone tumbler facade construction detection device

Abstract

The application belongs to the technical field of building construction detection, and particularly discloses a modularized crystal stone outer facade construction detection device, which comprises the following parts: an outer frame, which is arranged in a square frame structure and is attached to the outer facade by two frame plates; an inner ring, which is fixed at the center of the inner part of the outer frame; a plug rod, which is rotatably inserted into the inner part of the inner ring; a screw rod, which is inserted into the rear end of the plug rod, and a round plate is fixed to the front end of the plug rod; and a plate, which is located at the rear end of the screw rod, and the front surface of the plate is connected to the rear end of the screw rod by a tension strip, and the plate is attached to the outer facade by adhesive. The device can be quickly installed and the outer facade can be quickly pulled and detected by the cooperation of the outer frame, the inner ring, the plug rod, the screw rod and the plate, and the overall structure will not be fixedly installed on the outer facade, so that the installation damage of the outer facade can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of building construction inspection technology, and specifically relates to a modular crystal stone facade construction inspection device. Background Technology

[0002] Modular crystal stone is a commonly used exterior wall decoration material. After construction, it is necessary to test its adhesion to the base wall to prevent hollowing and detachment. Currently, traditional testing mainly relies on manual tapping and visual observation, which cannot quantitatively test the adhesion strength. The results are highly subjective, have large errors, and are difficult to detect hidden internal defects.

[0003] Existing testing devices are complex in structure, cumbersome in operation, and have poor versatility. They mostly use rigid fixing methods, which can easily damage the decorative surface.

[0004] Therefore, it is necessary to invent a modular Taojingshi facade construction inspection device to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a modular Taojing Stone facade construction inspection device to solve the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A modular Taojing Stone facade construction inspection device includes: an outer frame, which is a square frame structure and is attached to the facade using two support plates; an inner ring, fixed at the center inside the outer frame; a rod, which is rotatably inserted into the inner ring; a screw, which is inserted into the rear end of the rod and has a circular plate fixed to the front end of the rod; and a mounting plate, located at the rear end of the screw, with the rear end of the screw connected to the front side of the mounting plate by a pull strip, and the mounting plate is attached to the facade using adhesive.

[0007] Furthermore, side handles are fixed on both sides of the outer frame, with the two side handles arranged opposite each other.

[0008] Furthermore, the rear end of the insertion rod is provided with an inner groove corresponding to the screw, and a slip ring is provided inside the inner groove. The rear end of the screw is screwed into the slip ring, and the rear side of the slip ring is connected to the rear side of the inner groove by a first elastic element.

[0009] Furthermore, the inner ring utilizes a clamping component to define the insertion rod. The clamping component includes a rotating rod, a rotating block, a clamping plate, and a crossbar. Two opposing side edges are fixed to the rear side of the outer circumference of the inner ring. A rotating rod is inserted into the center of each side edge. A nut is screwed onto the front end of the rotating rod. A rotating block is fixed to the rear end of the rotating rod. A clamping plate is provided on the inner side of the rotating block. Two crossbars pass through the rotating block on the outer side of the clamping plate. An annular groove is provided on the surface of the insertion rod, and the concave surface of the clamping plate fits against the inner wall of the annular groove.

[0010] Furthermore, an arc-shaped strip is provided on the inner side of the rotating block, the outer end of the arc-shaped strip is slidably sleeved on the surface of the two crossbars, and a pressure plate is connected to the outer end of the arc-shaped strip, the inner side of the pressure plate is attached to the surface of the annular groove.

[0011] Furthermore, a retaining strip is fixed to the surface of the rotating rod, and a through groove corresponding to the rotating rod is provided at the center of the side. A slot corresponding to the retaining strip is opened on the rear side of the through groove, and an arc-shaped groove is provided at the front end of the slot. The retaining strip is inserted into the arc-shaped groove through the slot, and the rotating rod causes the retaining strip to rotate inside the arc-shaped groove.

[0012] Furthermore, a locking rod is vertically inserted into the outer side of the rotating block, a protrusion is fixed to the inner end of the locking rod, and multiple tooth grooves corresponding to the protrusion are opened on the surface of the crossbar. The outer end of the locking rod is connected to the surface of the rotating block by a second elastic element.

[0013] Furthermore, a limiting rod is fixed to the surface of the rotating block, and the outer end of the locking rod slides on the surface of the limiting rod using a convex edge.

[0014] The technical effects and advantages of this invention are as follows: 1. This invention, through the cooperation of the outer frame, inner ring, insert rod, screw and plate, can quickly complete the installation of the device and the external facade pull test, and the overall structure is not fixed to the external facade, avoiding installation damage to the external facade.

[0015] 2. The present invention uses the rotation of the rotating block to align the clamping plate with the annular groove of the insertion rod, thereby achieving stable clamping of the insertion rod and preventing the insertion rod from shifting or shaking during the inspection of the facade. This ensures uniform transmission of tensile force and improves the accuracy of facade inspection.

[0016] 3. The present invention uses the rotating block to make the pressure plate and clamping plate double-press the annular groove. The spiral effect of the nut and the rotating rod locks the rotating rod inside the through groove, further enhancing the positioning effect of the insertion rod. At the same time, the insertion rod can be quickly disassembled and replaced. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the modular Taojing Stone facade construction inspection device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal components of the outer frame in an embodiment of the present invention; Figure 3 This is a schematic diagram of the insertion rod penetrating the inner ring according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the screw front end being inserted into the plug rear end according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the screw front end being helically inserted into the slip ring according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the clamping component structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a rotating block with a rotating rod fixed on its front side according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the locking rod of the present invention being engaged with the tooth groove by means of a protrusion; In the diagram: 1. Outer frame; 101. Frame plate; 2. Inner ring; 3. Insert rod; 301. Ring groove; 4. Screw; 5. Round plate; 6. Adhesive plate; 7. Side handle; 8. Slip ring; 9. First elastic element; 10. Rotating rod; 11. Rotating block; 12. Clamping plate; 13. Crossbar; 14. Side; 15. Nut; 16. Arc strip; 17. Pressure plate; 18. Locking strip; 19. Slot; 20. Arc groove; 21. Locking rod; 22. Protrusion; 23. Gear groove; 24. Second elastic element; 25. Limiting rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0019] This invention provides a modular Taojing Stone facade construction inspection device, such as... Figures 1 to 5 As shown, it includes: an outer frame 1, an inner ring 2, a plug rod 3, a screw rod 4, a circular plate 5, a mounting plate 6, a side handle 7, a slip ring 8, and a first elastic element 9, wherein the first elastic element 9 is a conventional spring sheet. The outer frame 1 is a square frame structure, and an opening is provided on the rear side of the outer frame 1. A frame plate 101 is fixed to the rear side of both sides of the outer frame 1, and a side handle 7 is fixed to both sides of the outer frame 1. The outer frame 1 is attached to the exterior facade using the frame plate 101.

[0020] The exterior facade is designed as a modular crystal stone facade.

[0021] An inner ring 2 is fixed inside the outer frame 1. The insert rod 3 is inserted into the outer frame 1 through the inner ring 2. A circular plate 5 is fixed to the front end of the insert rod 3. The outer side of the circular plate 5 is provided with multiple chamfers, which allow the insert rod 3 to rotate inside the inner ring 2. An inner groove is provided at the rear end of the insert rod 3. The front end of the screw rod 4 is inserted into the inner groove. A slip ring 8 is slidably engaged inside the inner groove. The rear side of the slip ring 8 is connected to the rear side of the inner groove by a first elastic element 9. The front end of the screw rod 4 is screwed into the slip ring 8. The rear end of the screw rod 4 is connected to the front side of the panel 6 by a pull strip. The panel 6 is attached to the outer facade with adhesive.

[0022] The adhesive used is a biodegradable adhesive found in existing technologies.

[0023] Specifically, by holding the multiple chamfered portions of the circular plate 5, the circular plate 5 causes the insert rod 3 to move backward inside the inner ring 2, inserting the front end of the screw 4 into the inner groove. By rotating the screw 4, due to the multiple first elastic elements 9 limiting the slip ring 8, the front end of the rotating screw 4 is spirally inserted into the slip ring 8, and the rear end of the screw 4 is connected to the plate 6 by a pull strip.

[0024] The back side of the mounting plate 6 is adhered with adhesive. The outer frame 1 is aligned with the facade to be inspected. At this time, the outer frame 1 is attached to the facade using the frame plate 101. The mounting plate 6 is pushed closer to the facade. The mounting plate 6 uses the pull bar to drive the screw 4 and the slip ring 8 to move backward synchronously. Due to the elastic force of the first elastic element 9, the round plate 5 moves backward through the insert rod 3. When the back side of the round plate 5 is attached to the front side of the outer frame 1, the mounting plate 6 is completely and tightly attached to the facade using adhesive.

[0025] Holding the side handle 7, the side handle 7 moves the outer frame 1 away from the facade. The outer frame 1, which is away from the facade, uses the circular plate 5 to move the insert rod 3 backward in sync. Since the plate 6 is attached to the facade with adhesive, the plate 6 uses the pull strip to limit the screw 4 and the slip ring 8. At this time, the insert rod 3 moves forward outside the slip ring 8 using the inner groove. At this time, the slip ring 8 cooperates to squeeze the first elastic element 9 inside the inner groove. When the insert rod 3 can no longer move forward on the surface of the slip ring 8, the slip ring 8 and the first elastic element 9 are subjected to force along the axial direction of the insert rod 3, realizing the transmission of the pulling force to the facade. At this time, the outer frame 1 uses the insert rod 3, screw 4, pull strip and plate 6 to pull the facade. The pulling test of the facade is completed by pulling.

[0026] In this embodiment, the device installation and exterior facade pull test can be quickly completed through the cooperation of the outer frame 1, inner ring 2, insert rod 3, screw 4 and mounting plate 6, and the overall structure is not fixed to the exterior facade, thus avoiding installation damage to the exterior facade.

[0027] To confine the insert rod 3 within the inner ring 2, two clamping components are used to hold the insert rod 3 in place. Figure 2 , Figure 3 and Figure 6 In the middle, the clamping components include: a rotating rod 10, a rotating block 11, a clamping plate 12, and a crossbar 13; two opposing side edges 14 are fixed on the rear side of the outer circumference of the inner ring 2, and a through groove corresponding to the rotating rod 10 is provided at the center of the side edge 14. The front end of the rotating rod 10 passes through the through groove, and a nut 15 is screwed onto the front end of the rotating rod 10. The rotating block 11 at the rear end of the rotating rod 10 is attached to the rear side of the side edge 14, and the rotating block 11 rotates about the rotating rod 10 as the axis.

[0028] A clamping plate 12 is provided on the inner side of the rotating block 11. Two crossbars 13 pass through the rotating block 11 on the outer side of the clamping plate 12. An annular groove 301 is provided on the surface of the insertion rod 3, and the concave surface of the clamping plate 12 is attached to the inner wall of the annular groove 301.

[0029] Specifically, the rotating rod 10 passes through the through groove, and a nut 15 is screwed onto the front end of the rotating rod 10. The nut 15 and the rotating rod 10 work together to limit the rotating block 11.

[0030] Insert the rod 3 into the inner ring 2 and rotate the rotating block 11. The rotating block 11 causes the rod 10 to rotate inside the through groove. At this time, the two rotating blocks 11 rotate clockwise in sync. After the rotating block 11 rotates 90°, the annular groove 301 on the surface of the rod 3 corresponds to the clamping plate 12. Push the clamping plate 12 close to the rod 3 until the concave surface of the clamping plate 12 fits against the inner side wall of the annular groove 301. At this time, the two clamping plates 12 cooperate to limit the rod 3.

[0031] In this embodiment, the rotation of the rotating block 11 causes the clamping plate 12 to align with the annular groove 301 of the insertion rod 3, thereby achieving stable clamping of the insertion rod 3 and preventing the insertion rod 3 from shifting or shaking during the inspection of the facade. This ensures uniform transmission of pulling force and improves the accuracy of facade inspection.

[0032] To further limit the insertion rod 3, the pressure plate 17 is used to clamp the insertion rod 3. Figure 2 , Figure 3 and Figure 6 In the middle, an arc-shaped strip 16 is provided on the inner side of the rotating block 11. The outer end of the arc-shaped strip 16 is slidably sleeved on the surface of the two crossbars 13, and the outer end of the arc-shaped strip 16 is connected to a pressure plate 17. The inner side of the pressure plate 17 is attached to the surface of the annular groove 301.

[0033] A retaining strip 18 is fixed on the surface of the rotating rod 10. A slot 19 corresponding to the retaining strip 18 is opened on the rear side of the through groove, and an arc groove 20 is provided on the front end of the slot 19. The retaining strip 18 is inserted into the arc groove 20 through the slot 19, and the rotating rod 10 causes the retaining strip 18 to rotate inside the arc groove 20.

[0034] Specifically, when the rotating block 11 rotates clockwise, it causes the rotating rod 10 to rotate synchronously inside the through groove. The rotating rod 10 causes the locking strip 18 to rotate 90° inside the arc groove 20, which facilitates the alignment of the concave surface of the clamping plate 12 with the annular groove 301. The rotating block 11 uses the crossbar 13 and the arc strip 16 to make the pressure plate 17 rotate synchronously, pushing the pressure plate 17 to move. The pressure plate 17 causes the arc strip 16 to slide on the surface of the crossbar 13 until the pressure plate 17 is tightly attached to the surface of the annular groove 301. Then, the nut 15 is tightened. The spiral effect of the nut 15 and the rotating rod 10 locks the rotating rod 10 inside the through groove. At this time, the rotating rod 10 uses the locking strip 18 to press the arc groove 20, preventing the insertion rod 3 from rotating or moving arbitrarily inside the inner ring 2.

[0035] When the panel 6 is attached to the exterior facade with adhesive, the side handle 7 moves the outer frame 1 away from the exterior facade. When the insert rod 3 cannot move forward on the surface of the screw 4, the outer frame 1 moves on the surface of the insert rod 3 using the inner ring 2. At this time, the clamping plate 12 and the pressure plate 17 move forward on the surface of the ring groove 301. When the round plate 5 is attached to the front side of the outer frame 1, it is convenient to perform a pull test on the exterior facade by pulling.

[0036] Pull the clamping plate 12 away from the insertion rod 3, and rotate the rotating block 11 counterclockwise. The rotating block 11 uses the crossbar 13 to make the clamping plate 12 and the arc strip 16 rotate counterclockwise synchronously. At this time, the clamping plate 12 and the pressure plate 17 are away from the ring groove 301, which makes it easier to pull the insertion rod 3 out from the inner ring 2. Then, the new insertion rod 3 is inserted into the inner ring 2, and the clamping component is used to limit the new insertion rod 3.

[0037] In this embodiment, the rotating block 11 rotates to double-press the pressure plate 17 and the clamping plate 12 into the ring groove 301. The spiral effect of the nut 15 and the rotating rod 10 locks the rotating rod 10 inside the through groove, further enhancing the positioning effect of the insertion rod 3. At the same time, the insertion rod 3 can be quickly disassembled and replaced.

[0038] In order to lock the clamping plate 12 inside the rotating block 11, the crossbar 13 is fixed by locking. Figure 3 , Figures 6 to 8 In the middle, a locking rod 21 is vertically inserted into the outer side of the rotating block 11. A protrusion 22 is fixed to the inner end of the locking rod 21, and multiple toothed grooves 23 corresponding to the protrusion 22 are opened on the surface of the crossbar 13. The outer end of the locking rod 21 is connected to the surface of the rotating block 11 by a second elastic element 24, which is a spring. A limiting rod 25 is fixed to the surface of the rotating block 11, and the outer end of the locking rod 21 slides on the surface of the limiting rod 25 by means of a protruding edge.

[0039] Specifically, the locking rod 21 is pulled away from the crossbar 13. The locking rod 21 uses its convex edge to pull the second elastic element 24 on the surface of the limiting rod 25. The moving locking rod 21 causes the protrusion 22 to move away from the crossbar 13. Then, the clamping plate 12 is pushed close to the insertion rod 3. When the concave surface of the clamping plate 12 is in contact with the outside of the annular groove 301, the tension applied to the locking rod 21 is released. The elastic force of the second elastic element 24 causes the protrusion 22 at the inner end of the locking rod 21 to be inserted into the tooth groove 23, thus completing the limitation of the clamping plate 12. At this time, the two clamping plates 12 cooperate to limit the insertion rods 3 with different outer diameters.

[0040] In this embodiment, the elastic force of the second elastic element 24 facilitates the locking rod 21 to cooperate with the tooth groove 23 to quickly lock the crossbar 13, and the distance between the two clamping plates 12 can be flexibly adjusted to accommodate insert rods 3 with different outer diameters.

[0041] Working principle of this invention: Reference Figures 1 to 8As shown, the circular plate 5 is held by multiple chamfered parts. The circular plate 5 causes the insert rod 3 to move backward inside the inner ring 2, and the rotating rod 10 passes through the through groove. A nut 15 is screwed onto the front end of the rotating rod 10. The nut 15 and the rotating rod 10 cooperate to limit the rotating block 11.

[0042] Insert the rod 3 into the inner ring 2 and rotate the rotating block 11. The rotating block 11 causes the rotating rod 10 to rotate inside the through groove. At this time, the two rotating blocks 11 rotate clockwise synchronously. After the rotating block 11 rotates 90°, the annular groove 301 on the surface of the rod 3 corresponds to the clamping plate 12.

[0043] Pull the locking rod 21 away from the crossbar 13. The locking rod 21 uses its convex edge to pull the second elastic element 24 on the surface of the limiting rod 25. The moving locking rod 21 causes the convex head 22 to move away from the crossbar 13. Then, push the clamping plate 12 close to the insertion rod 3. When the concave surface of the clamping plate 12 is in contact with the outside of the annular groove 301, the tension applied to the locking rod 21 is released. The elastic force of the second elastic element 24 causes the convex head 22 at the inner end of the locking rod 21 to be inserted into the tooth groove 23, thus completing the limitation of the clamping plate 12. At this time, the two clamping plates 12 cooperate to limit the insertion rods 3 with different outer diameters.

[0044] When the rotating block 11 rotates clockwise, it causes the rotating rod 10 to rotate synchronously inside the through groove. The rotating rod 10 causes the locking strip 18 to rotate 90° inside the arc groove 20, which facilitates the alignment of the concave surface of the clamping plate 12 with the annular groove 301. The rotating block 11 uses the crossbar 13 and the arc strip 16 to make the pressure plate 17 rotate synchronously, pushing the pressure plate 17 to move. The pressure plate 17 causes the arc strip 16 to slide on the surface of the crossbar 13 until the pressure plate 17 is tightly attached to the surface of the annular groove 301. Then, the nut 15 is tightened. The spiral effect of the nut 15 and the rotating rod 10 locks the rotating rod 10 inside the through groove. At this time, the rotating rod 10 uses the locking strip 18 to press the arc groove 20, preventing the insertion rod 3 from rotating or moving arbitrarily inside the inner ring 2.

[0045] Insert the front end of the screw 4 into the inner groove and rotate the screw 4. Due to the multiple first elastic elements 9 limiting the slip ring 8, the front end of the rotating screw 4 is spirally inserted into the slip ring 8. The rear end of the screw 4 is connected to the plate 6 by a pull bar.

[0046] The back side of the mounting plate 6 is adhered with adhesive. The outer frame 1 is aligned with the facade to be inspected. At this time, the outer frame 1 is attached to the facade using the frame plate 101. The mounting plate 6 is pushed closer to the facade. The mounting plate 6 uses the pull bar to drive the screw 4 and the slip ring 8 to move backward synchronously. Due to the elastic force of the first elastic element 9, the round plate 5 moves backward through the insert rod 3. When the back side of the round plate 5 is attached to the front side of the outer frame 1, the mounting plate 6 is completely and tightly attached to the facade using adhesive.

[0047] Holding the side handle 7, the side handle 7 moves the outer frame 1 away from the facade. The outer frame 1, which is away from the facade, uses the circular plate 5 to move the insert rod 3 backward in sync. Since the plate 6 is attached to the facade with adhesive, the plate 6 uses the pull strip to limit the screw 4 and the slip ring 8. At this time, the insert rod 3 moves forward outside the slip ring 8 using the inner groove. At this time, the slip ring 8 cooperates to squeeze the first elastic element 9 inside the inner groove. When the insert rod 3 can no longer move forward on the surface of the slip ring 8, the outer frame 1 uses the insert rod 3, screw 4, pull strip and plate 6 to pull the facade. The pulling test of the facade is completed by pulling.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A modular Taojing Stone facade construction inspection device, characterized in that, include: The outer frame (1) is set as a square frame structure, and the outer frame (1) is attached to the outer facade using two frame plates (101); The inner ring (2) is fixed at the center inside the outer frame (1); Insert rod (3) is rotatably inserted into the inner ring (2); The screw (4) is inserted into the rear end of the plug (3), and the front end of the plug (3) is fixed with a round plate (5). The mounting plate (6) is located at the rear end of the screw (4). The rear end of the screw (4) is connected to the front side of the mounting plate (6) by a pull strip, and the mounting plate (6) is attached to the exterior facade by adhesive.

2. The modular Taojing Stone facade construction inspection device according to claim 1, characterized in that: The outer frame (1) has side handles (7) fixed on both sides, and the two side handles (7) are arranged opposite to each other.

3. The modular Taojing Stone facade construction inspection device according to claim 1, characterized in that: The rear end of the insert (3) is provided with an inner groove corresponding to the screw (4), and a slip ring (8) is provided inside the inner groove. The rear end of the screw (4) is screwed into the slip ring (8), and the rear side of the slip ring (8) is connected to the rear side of the inner groove by the first elastic element (9).

4. The modular Taojing Stone facade construction inspection device according to claim 1, characterized in that: The inner ring (2) uses a clamping component to limit the insertion rod (3). The clamping component includes: a rotating rod (10), a rotating block (11), a clamping plate (12), and a crossbar (13). The outer side of the inner ring (2) has two opposite sides (14) fixed on the rear side. A rotating rod (10) is inserted into the center of the side (14). A nut (15) is screwed onto the front end of the rotating rod (10). A rotating block (11) is fixed to the rear end of the rotating rod (10). A clamping plate (12) is provided on the inner side of the rotating block (11). The outer side of the clamping plate (12) is penetrated by two crossbars (13). An annular groove (301) is provided on the surface of the insertion rod (3), and the concave surface of the clamping plate (12) is attached to the inner wall of the annular groove (301).

5. The modular Taojing Stone facade construction inspection device according to claim 4, characterized in that: The inner side of the rotating block (11) is provided with an arc-shaped strip (16), the outer end of the arc-shaped strip (16) is slidably sleeved on the surface of the two crossbars (13), and the outer end of the arc-shaped strip (16) is connected to a pressure plate (17), the inner side of the pressure plate (17) is attached to the surface of the annular groove (301).

6. The modular Taojing Stone facade construction inspection device according to claim 4, characterized in that: The rotating rod (10) has a locking strip (18) fixed on its surface. A through groove corresponding to the rotating rod (10) is provided at the center of the side (14). A slot (19) corresponding to the locking strip (18) is opened on the rear side of the through groove. An arc groove (20) is provided at the front end of the slot (19). The locking strip (18) is inserted into the arc groove (20) through the slot (19). The rotating rod (10) causes the locking strip (18) to rotate inside the arc groove (20).

7. The modular Taojing Stone facade construction inspection device according to claim 4, characterized in that: A locking rod (21) is vertically inserted into the outer side of the rotating block (11). A protrusion (22) is fixed on the inner end of the locking rod (21), and multiple tooth grooves (23) corresponding to the protrusion (22) are opened on the surface of the crossbar (13). The outer end of the locking rod (21) is connected to the surface of the rotating block (11) by a second elastic element (24).

8. The modular Taojing Stone facade construction inspection device according to claim 7, characterized in that: The rotating block (11) has a limiting rod (25) fixed on its surface, and the outer end of the locking rod (21) slides on the surface of the limiting rod (25) using a convex edge.

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