A positioning clamp for laying plant soil stabilization netting suitable for slope greening

Abstract

This utility model discloses a positioning clamp for laying plant soil stabilization netting suitable for slope greening, belonging to the field of positioning clamp technology. Addressing the problems of poor fixing stability, weak adaptability, cumbersome operation, and low efficiency in existing clamps, the following solution is proposed: A fixing cylinder is included, with a collar fixedly fitted onto its outer wall. Connecting blocks, evenly distributed along the annular outer wall of the collar, are welded to the collar. Insert rods are inserted into the top of each connecting block at the end furthest from the collar. This utility model offers high fixing stability and strong adaptability: it adopts a "longitudinal + transverse" dual fixing structure, solving the problem of poor stability in traditional clamps. Longitudinally, a conical nail at the bottom of the fixing cylinder is inserted into the deep soil to initially anchor the clamp. Transversely, pressing the connecting rod causes the conical block to push the insert rod out and insert it into the surrounding soil, forming a "barbed" fixing that effectively resists slope gravity and rainwater erosion, adapting to slopes of different gradients.

Description

Technical Field

[0001] This utility model relates to the field of positioning clamp technology, and in particular to a positioning clamp for laying plant soil stabilization netting suitable for slope greening. Background Technology

[0002] Plant-stabilizing netting installation and positioning clamps, suitable for slope greening, are core auxiliary tools in slope ecological restoration and greening projects. They are mainly used to fix plant-stabilizing netting (such as coconut fiber netting, non-woven fabric netting, etc.) to slope surfaces such as highway slopes, mine restoration slopes, and riverbanks. Their core function is to prevent the netting from shifting, wrinkling, or falling off under the influence of slope gravity, rainwater erosion, and wind through physical fixation. This ensures the netting effectively covers the slope soil, reduces soil erosion, and provides a stable growing base for subsequent planting of herbs, shrubs, and other plants. It is a crucial guarantee for achieving the entire process of "soil stabilization-planting-ecological restoration" in slope greening.

[0003] However, existing positioning clamps for planting soil stabilization nets have significant shortcomings in practical applications.

[0004] On the one hand, the fixation stability is poor and the adaptability is weak: most clamps rely on a single conical rod to be inserted into the soil for fixation. On steep slopes (slope > 30°) or in loose soil environments, the clamps are prone to sliding upward due to insufficient soil gripping force, which in turn causes the soil stabilization net to wrinkle and crack. Moreover, the existing clamps lack a lateral fixing structure. When the soil is loosened after rainwater erosion, the clamps are prone to tilting and cannot maintain the flat coverage of the soil stabilization net for a long time.

[0005] On the other hand, the operation is cumbersome and inefficient: traditional clamps require the cooperation of multiple people, one person pulls the soil stabilization net to adjust the flatness, one person holds the clamp to align the position, and another person taps the insertion rod to fix it. A single person cannot complete the operation independently; moreover, the insertion depth of the insertion rod depends entirely on experience. If it is too shallow, it will easily loosen, and if it is too deep, it will damage the slope soil structure and even damage the root system of the plants below, which increases the difficulty of construction and time cost. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a positioning clamp for laying plant soil stabilization nets suitable for slope greening, which overcomes the deficiencies of existing technologies and effectively solves the problems of poor fixing stability, weak adaptability, cumbersome operation, and low efficiency of existing clamps.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A positioning clamp for laying plant soil stabilization nets suitable for slope greening includes a fixing cylinder. A collar is sleeved and fixed to the outer wall of the fixing cylinder, and connecting blocks are welded and fixed at equal intervals along the annular outer wall of the collar. A rod is inserted into the top of each connecting block at the end away from the collar. A fixing rod is welded and fixed to one side of the top of the fixing cylinder, and a limiting block is rotatably connected to the top of the fixing rod. A conical nail is welded and fixed to the bottom of the fixing cylinder, and a connecting rod is inserted and movable at the top of the fixing cylinder. A conical block is welded and fixed to the bottom of the connecting rod, and limiting components are arranged at equal intervals along the annular below the conical block. The limiting components include a nail, a ball block welded and fixed to one end of the nail, and a telescopic spring that is sleeved and movable on the outer wall of the nail.

[0009] Furthermore, a round block is welded to the top of the insertion rod, and the bottom of the insertion rod is conical. Adjacent plant soil stabilization nets are tightly fitted together by fixing cylinders, insertion rods, and the ground.

[0010] The round blocks increase the contact area for pressing, avoiding excessive force on the hands; the cone angle at the bottom of the insert rod facilitates quick insertion into the soil, reducing construction resistance; the edges of adjacent soil stabilization nets overlap, and the insert rod passes through the overlap to fix it to the soil, ensuring that the soil stabilization net covers the soil without gaps.

[0011] Furthermore, an anti-slip sheet is glued and fixed to one bottom end of the limiting block, and the distance between the bottom of the anti-slip sheet and the top of the fixing cylinder is equal to the height of the pressing block.

[0012] The anti-slip pad is made of nitrile rubber and can fit tightly against the surface of the pressing block. The pressing block is welded to the top of the connecting rod to ensure that the pressing block can be pressed tightly after the limit block rotates, thus fixing the position of the connecting rod and preventing it from moving upward.

[0013] Furthermore, the conical block is located inside the fixed cylinder, and the distance between the maximum outer diameter of the conical block and the inner diameter of the fixed cylinder is greater than the outer diameter of the spherical block.

[0014] Sufficient space is left between the cone block and the ball block to allow the inclined surface of the cone block to squeeze the ball block and push the pin out.

[0015] Furthermore, the bottom end of the outer wall of the fixed cylinder is provided with equally spaced insertion holes along a ring, and the inner diameter of the insertion holes is adapted to the outer diameter of the insertion pin.

[0016] The diameter of the insertion hole is matched with the insertion pin to ensure that the insertion pin does not get stuck when it is extended or retracted, while preventing soil particles from entering the fixing cylinder.

[0017] Furthermore, the length of the insert is less than the radius of the fixed cylinder, and the telescopic spring is located between the ball and the annular inner wall of the fixed cylinder.

[0018] The length of the insert should be kept from being too long; the telescopic spring pushes the insert back in its natural state to ensure that the clamp is inserted into the soil without obstruction.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. High stability and strong adaptability: The dual fixing structure of "longitudinal + transverse" solves the problem of poor stability of traditional clamps. In the longitudinal direction, the cone nail at the bottom of the fixing cylinder is inserted into the deep soil to initially anchor the clamp. In the transverse direction, the cone block pushes the nail out and inserts into the surrounding soil by pressing the connecting rod, forming a "hook-type" fixation, which effectively resists the gravity of the slope and the erosion of rainwater, and is suitable for slopes with different slopes.

[0021] 2. Simple operation and improved efficiency: The entire process can be completed by a single person without the need for multiple people to cooperate. The fixing cylinder can be held with one hand to insert the cone nail, and the round block at the top of the insertion rod can be pressed to fix the soil stabilizing net. The limiting block can quickly lock the position of the connecting rod, saving the manpower to pull and adjust the soil stabilizing net and greatly reducing construction costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a positioning clamp for laying plant soil stabilization nets suitable for slope greening proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of a positioning clamp for laying plant soil stabilization nets suitable for slope greening proposed in this utility model.

[0024] Figure 3 This is a schematic diagram of the internal structure of the fixing cylinder of a positioning clamp for laying plant soil stabilization nets suitable for slope greening proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the limiting component structure of a positioning clamp for laying plant soil stabilization nets suitable for slope greening, as proposed in this utility model.

[0026] In the diagram: 1. Fixed cylinder; 2. Collar; 3. Connecting block; 4. Insert rod; 5. Fixed rod; 6. Limiting block; 7. Conical nail; 8. Connecting rod; 9. Pressing block; 10. Conical block; 11. Limiting assembly; 12. Insert nail; 13. Ball block; 14. Telescopic spring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example:

[0029] Reference Figure 1-4A positioning clamp for laying plant soil stabilization nets suitable for slope greening includes a fixing cylinder 1, a collar 2 fixedly fitted to the outer wall of the fixing cylinder 1, connecting blocks 3 evenly distributed along the annular outer wall of the collar 2, insert rods 4 inserted at the top of each connecting block 3 away from the collar 2, a fixing rod 5 welded to one side of the top of the fixing cylinder 1, a limiting block 6 rotatably connected to the top of the fixing rod 5, a conical nail 7 welded to the bottom of the fixing cylinder 1, a connecting rod 8 movably inserted into the top of the fixing cylinder 1, a conical block 10 welded to the bottom of the connecting rod 8, and limiting components 11 evenly distributed along the annular below the conical block 10. The limiting components 11 include a nail 12, a ball block 13 welded to one end of the nail 12, and a telescopic spring 14 fitted and movably attached to the outer wall of the nail 12.

[0030] A round block is welded to the top of the insertion rod 4, and the bottom of the insertion rod 4 is conical. Adjacent plant soil stabilization nets are tightly fitted together by the fixing cylinder 1, the insertion rod 4, and the ground. The round block has a diameter of 30-40mm and a thickness of 5mm to increase the pressing contact area and avoid excessive force on the hand. The cone angle at the bottom of the insertion rod 4 is 30-45°, which facilitates quick insertion into the soil and reduces construction resistance. The edges of adjacent soil stabilization nets overlap by 50-100mm. The insertion rod 4 passes through the overlap and is fixed to the soil to ensure that the soil stabilization nets cover without gaps. An anti-slip plate is glued to one end of the bottom of the limiting block 6. The distance between the bottom of the anti-slip plate and the top of the fixing cylinder 1 is equal to the height of the pressing block 9. The anti-slip plate is made of 3-5mm thick nitrile rubber with a friction coefficient ≥0.6, which can tightly fit the surface of the pressing block 9. The pressing block 9 is welded to the top of the connecting rod 8 (diameter 40-50mm, thickness 8mm) to ensure that the limiting block 6 can press the pressing block 9 after rotation, fix the position of the connecting rod 8, and prevent it from shifting upward.

[0031] The conical block 10 is located inside the fixed cylinder 1. The distance between the maximum outer diameter of the conical block 10 and the inner diameter of the fixed cylinder 1 is greater than the outer diameter of the ball block 13. The cone angle of the conical block 10 is 60-70°, and its maximum outer diameter is 48-58mm, which is 1-2mm smaller than the inner diameter of the fixed cylinder 1 (50-60mm) to ensure smooth up-and-down movement. The diameter of the ball block 13 is 20-25mm, leaving enough space for the inclined surface of the conical block 10 to press against the ball block 13 and push the pin 12 out. The bottom end of the outer wall of the fixed cylinder 1 has equally spaced insertion holes along a ring. The inner diameter of the insertion holes matches the outer diameter of the pin 12. The diameter of the insertion holes is 12-15mm. The distance from the bottom of the fixing cylinder 1 is 50-60mm, and the gap between the clamp and the pin 12 (diameter 11-14mm) is 0.1-0.2mm. This ensures that the pin 12 does not jam when it extends or retracts, and also prevents soil particles from entering the interior of the fixing cylinder 1. The length of the pin 12 is less than the radius of the fixing cylinder 1. The telescopic spring 14 is located between the ball block 13 and the annular inner wall of the fixing cylinder 1. The length of the pin 12 is 40-50mm to avoid excessive extension. The telescopic spring 14 is made of 65Mn steel (wire diameter 2-3mm, free length 30-40mm). In its natural state, it pushes the pin 12 back to ensure that the clamp is inserted into the soil without obstruction.

[0032] For the fixing cylinder and collar assembly: Fixing cylinder 1 is made of Q235 low carbon steel, with a wall thickness of 3-5mm, an inner diameter of 50-60mm, and a length of 200-250mm. The surface is hot-dip galvanized (zinc layer thickness 80-100μm), achieving a rust-proof rating meeting GB / T13912-2002 standards. It can be used outdoors in damp soil environments for 3-5 years without rusting. Collar 2 is a circular steel ring of the same material (inner diameter interference fits the outer wall of fixing cylinder 1, width 30-40mm, thickness 5mm), and is fixed to fixing cylinder 1 by argon arc welding. The collar 2 (80-100mm from the top) has a weld leg height of 4-6mm. The weld is inspected for defects and no false welds are found. This ensures that the collar 2 is firmly connected to the fixed cylinder 1. Four connecting blocks 3 (80-100mm long, 30-40mm wide, and 5mm thick) are evenly welded along the circumference of the outer annular wall of the collar 2. The included angle between adjacent connecting blocks 3 is 90° to ensure balanced force. A circular insertion hole with a diameter of 15-20mm is opened at the top of the connecting block 3 away from the collar 2. The inner wall of the insertion hole is polished (roughness Ra≤6.3μm) to reduce the frictional resistance when the insertion rod 4 is inserted.

[0033] For the fixing part of the insertion rod and the soil stabilization net: The insertion rod 4 is made of 304 stainless steel (diameter 14-19mm, length 150-200mm), which has both rust resistance and strength, and avoids long-term burial and corrosion. The bottom of the insertion rod 4 is processed into a cone shape (cone angle 30-45°), and the length of the cone end is 20-30mm, which facilitates quick penetration of the soil stabilization net and insertion into the soil. A circular steel block with a diameter of 30-40mm (thickness 5mm) is welded to the top. The surface of the steel block is polished smooth to increase the pressure area for the hand and avoid hand injury during construction. During construction, the edges of adjacent soil stabilization nets overlap by 50-100mm. Insert the insertion rod 4 through the overlapping soil stabilization net (if the soil stabilization net is made of coarse fiber material, it can be pierced directly; if it is made of high-density non-woven fabric, a hole can be pre-drilled with a pointed cone), align it with the insertion hole of the connecting block 3, and insert it vertically into the soil to a depth of 80-120mm. The clamping action of the insertion rod 4, the connecting block 3, and the soil fixes the edge of the soil stabilization net and prevents displacement.

[0034] For the fixing rod and limiting block: the fixing rod 5 is a Q235 steel round rod (diameter 10-12mm, length 50-60mm), one end of which is fixed to the top side of the fixing cylinder 1 (20-30mm from the edge of the fixing cylinder 1) by fillet weld, with a weld leg height of 3-4mm to ensure it can withstand the pressure of the limiting block 6; the other end is rotatably connected to the limiting block 6 (length 40-50mm, width 20-25mm, thickness 5mm) by an M6 pin, and the pin is connected to the limiting block. The fit clearance of 6 is 0.1-0.2mm, allowing the limiting block 6 to rotate flexibly around the pin shaft (rotation angle 0-90°). A 3-5mm thick nitrile rubber anti-slip sheet is glued to one end of the bottom of the limiting block 6. The surface of the anti-slip sheet is pressed with diamond anti-slip texture. When the limiting block 6 rotates to cover the pressing block 9, the anti-slip sheet is in close contact with the surface of the pressing block 9, and the connecting rod 8 is fixed by friction to prevent it from moving upward after construction or rain erosion, ensuring that the pin 12 always remains in the extended state.

[0035] For the tapered nail and connecting rod: Tapered nail 7 is made of Q235 steel (length 80-100mm, cone angle 25-30°), and is fixed to the bottom center of the fixing cylinder 1 by full welding. After welding, the axis of tapered nail 7 coincides with the axis of fixing cylinder 1 (coaxiality deviation ≤0.5mm), ensuring uniform force distribution when inserted into the soil and preventing tilting. The surface of tapered nail 7 is hardened (hardness HRC40-45) to enhance wear resistance and prevent deformation when inserted into hard soil. The connecting rod 8 is made of Q23 steel. 5. A steel round rod (diameter 45-55mm, length 220-270mm), with a circular pressing block 9 (diameter 40-50mm, thickness 8mm) welded to the top. The pressing block 9 has rounded edges (radius 5mm) to prevent hand injuries. A conical block 10 (cone angle 60-70°, maximum outer diameter 48-58mm) is welded to the bottom. The surface of the conical block 10 is polished to reduce frictional resistance when in contact with the ball block 13, ensuring smooth pressure on the ball block 13 to push the pin 12.

[0036] For the limiting component: Four circular insertion holes are formed along the bottom of the outer wall of the fixing cylinder 1, with the hole axis perpendicular to the axis of the fixing cylinder 1. This ensures that the protruding direction of the pin 12 is horizontal, maximizing the lateral fixing effect. The pin 12 is a 304 stainless steel round rod (diameter 11-14mm, length 40-50mm), with a spherical steel block 13 (diameter 20-25mm) welded to one end. The surface of the spherical block 13 is polished to reduce friction with the inclined surface of the conical block 10. The other end is machined into a cone shape (cone angle 30-45°) for easy insertion into the soil and expansion / contraction. Spring 14 is sleeved on the outer wall of pin 12, located between ball block 13 and the annular inner wall of fixing cylinder 1. In its natural state, the spring is in a slightly compressed state (compression amount 5-8mm), pushing ball block 13 to press against the outer wall of conical block 10, causing the other end of pin 12 to retract into the fixing cylinder 1, thus preventing pin 12 from obstructing conical nail 7 when the clamp is inserted into the soil. When conical block 10 moves down and squeezes ball block 13, the spring is further compressed (maximum compression amount 20-25mm). After conical block 10 is fixed, the reaction force of the spring can help maintain the extended state of pin 12.

[0037] Working principle:

[0038] Construction preparation and initial fixing: First, according to the slope greening design requirements, determine the laying direction and overlap width of the soil stabilization net (the edges of adjacent soil stabilization nets overlap by 50-100mm). Mark a clamp fixing point every 1-1.5m at the overlap (the density can be increased to 0.8-1m in steep slope areas). Take the positioning clamp, first hold the middle of the fixing cylinder 1 or the connecting block 3 of the collar 2 by hand, rotate the limiting block 6 (around the pin at the top of the fixing rod 5) to rotate it 90° outward from the fixing cylinder 1, exposing the pressing block 9 at the top of the connecting rod 8, to avoid obstructing the subsequent pressing action. Align the cone nail 7 at the bottom of the fixing cylinder 1 with the marked fixing point, and press the fixing cylinder 1 down with both hands to make the cone nail 7 penetrate the soil stabilization net and insert into the slope soil (insertion depth 50-80mm). Use the friction between the cone nail 7 and the soil to achieve the initial positioning of the clamp. At this time, the fixing cylinder 1 should be kept perpendicular to the slope surface to avoid tilting.

[0039] Edge fixing of soil stabilization net: Adjust the flatness of the soil stabilization net and flatten the overlapping edges of adjacent soil stabilization nets so that they cover the bottom of the connecting block 3 (ensure there are no wrinkles at the overlap). Take the insertion rod 4 and align it with the insertion hole at the top of the connecting block 3 away from the end of the collar 2. Hold the round block at the top of the insertion rod 4 with both hands and press down hard so that the conical end at the bottom of the insertion rod 4 penetrates the soil stabilization net and is inserted into the soil (insertion depth 80-120mm). Since the insertion rod 4 fits tightly with the insertion hole of the connecting block 3 and the bottom of the insertion rod 4 is deep into the soil, the overlapping edge of the soil stabilization net is clamped between the connecting block 3 and the soil, thereby achieving lateral fixation of the soil stabilization net and preventing it from sliding along the slope. Repeat the above actions to insert the insertion rod 4 corresponding to all connecting blocks 3 into the soil to complete the overall fixation of the edge of the soil stabilization net.

[0040] Fixture Depth Fixing and Locking: Place both palms on the pressing block 9 at the top of the connecting rod 8 and press down evenly. This will cause the connecting rod 8 to move downwards along the inner wall of the fixing cylinder 1. The conical block 10 at the bottom of the connecting rod 8 will also move downwards. Since the inclined surface of the conical block 10 is in close contact with the ball block 13 of the limiting component 11, the inclined surface of the conical block 10 will generate a horizontal pushing force on the ball block 13 during the downward movement. This will push the insert 12 outwards along the insertion hole of the fixing cylinder 1 until the conical end of the insert 12 is inserted into the surrounding soil (insertion depth 30-40mm). At this time, the insert 12 forms a horizontal "barb" and... The longitudinal conical nails 7 work together to firmly fix the clamp in the slope soil, effectively resisting the loosening caused by the slope's gravity and rainwater erosion. When the pressing block 9 can no longer move down (the bottom of the conical block 10 contacts the bottom of the fixing cylinder 1), the pressing stops, and the limiting block 6 is rotated 90° toward the center of the fixing cylinder 1 until the anti-slip plate at the bottom of the limiting block 6 is tightly attached to the surface of the pressing block 9. The friction between the anti-slip plate and the pressing block 9 is used to limit the upward movement of the connecting rod 8, ensuring that the conical block 10 always maintains the squeezing state of the ball block 13, thereby allowing the insert nail 12 to continue to extend and maintain the lateral fixing effect.

[0041] Inspection and subsequent construction: Gently pull the edge of the soil stabilization net to check for any signs of loosening. If the soil stabilization net does not shift or wrinkle, the fixing work of the clamp is complete. If there is loosening, the insertion depth of the insert rod 4 or the cone nail 7 can be appropriately increased until the soil stabilization net is stable. Following the above process, all clamps on the slope are fixed in sequence to finally achieve a flat and stable coverage of the soil stabilization net on the entire slope. When the clamp needs to be removed later (such as when the soil stabilization net is old and needs to be replaced), first rotate the limit block 6 away from the pressing block 9, pull the pressing block 9 upward with both hands, and move the connecting rod 8 and the cone block 10 upward. Under the reaction force, the telescopic spring 14 pushes the ball block 13 to move towards the center of the fixing cylinder 1, so that the insert nail 12 retracts into the fixing cylinder 1. Then pull out all the insert rods 4, hold the fixing cylinder 1 with both hands and pull it upward to remove the entire clamp and complete the removal.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A positioning clamp for laying plant soil stabilization nets suitable for slope greening, comprising a fixing cylinder (1), characterized in that, The outer wall of the fixed cylinder (1) is fitted with a collar (2), and the annular outer wall of the collar (2) is welded with connecting blocks (3) distributed at equal intervals. The top of the connecting blocks (3) away from the collar (2) is fitted with a rod (4). The top side of the fixed cylinder (1) is welded with a fixing rod (5), and the top of the fixing rod (5) is rotatably connected to a limit block (6). The bottom of the fixed cylinder (1) is welded with a conical nail (7), and the top of the fixed cylinder (1) is fitted with a movable connecting rod (8). The bottom of the connecting rod (8) is welded with a conical block (10), and the bottom of the conical block (10) is provided with a limit component (11) distributed at equal intervals along the annular path. The limit component (11) includes a pin (12), a ball block (13) welded to one end of the pin (12), and a telescopic spring (14) fitted on the outer wall of the pin (12).

2. The positioning clamp for laying plant soil stabilization nets suitable for slope greening according to claim 1, characterized in that, The top of the insertion rod (4) is welded with a round block, and the bottom of the insertion rod (4) is conical. The adjacent plant soil stabilization nets are tightly fitted together by the fixing cylinder (1), the insertion rod (4) and the ground.

3. A positioning clamp for laying plant soil stabilization nets suitable for slope greening according to claim 1, characterized in that, The bottom end of the limiting block (6) is glued and fixed with an anti-slip sheet, and the distance between the bottom of the anti-slip sheet and the top of the fixing cylinder (1) is equal to the height of the pressing block (9).

4. A positioning clamp for laying plant soil stabilization nets suitable for slope greening according to claim 1, characterized in that, The conical block (10) is located inside the fixed cylinder (1), and the distance between the maximum outer diameter of the conical block (10) and the inner diameter of the fixed cylinder (1) is greater than the outer diameter of the ball block (13).

5. A positioning clamp for laying plant soil stabilization nets suitable for slope greening according to claim 1, characterized in that, The bottom of the outer wall of the fixed cylinder (1) is provided with equally spaced insertion holes along the annular shape, and the inner diameter of the insertion holes is adapted to the outer diameter of the insertion pin (12).

6. A positioning clamp for laying plant soil stabilization nets suitable for slope greening according to claim 1, characterized in that, The length of the pin (12) is less than the radius of the fixed cylinder (1), and the telescopic spring (14) is located between the ball (13) and the annular inner wall of the fixed cylinder (1).

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