Splicing type collection protection guardrail

Abstract

The invention relates to the technical field of collection protection guardrails, in particular to a spliced collection protection guardrail which comprises a guardrail body, a connecting mechanism is fixedly connected to the upper end of the guardrail body, a supporting mechanism and a conical barrel are arranged in the guardrail body, and a self-balancing mechanism is fixedly connected to the bottom end of the interior of the guardrail body. The guardrail body comprises a guardrail base, and the upper end of the guardrail base is movably connected with a guardrail rod. According to the guardrail, when the whole guardrail is not extruded after being extruded, the thrust of the extruded first spring telescopic rod and other first spring telescopic rods enable the connecting rods to reset through the tensile force of springs, the bottom of the guardrail can be corrected and reset through second spring telescopic rods, and therefore the guardrail can be reset through the connecting rods after being extruded; and the protection state is continuously kept.

Description

Technical Field

[0001] This invention relates to the field of protective railings for collectibles, specifically a modular protective railing for collectibles. Background Technology

[0002] Interlocking protective railings for artifacts are devices used in museums, art galleries, exhibition halls, and other venues. They are primarily used to protect exhibits and precious artifacts, prevent unauthorized entry, and also serve a decorative and display function.

[0003] In the process of protecting artifacts, the modular protective railings need to be adapted to the requirements of different venues and scenarios. Since artifact display venues usually require a large number of protective railings, which need to be spliced ​​and assembled, the speed of installation and dismantling of the protective railings is particularly important. In addition, during the protection process, people inevitably crowd together, causing the railings to be squeezed or bent over to take pictures. This makes the railings very easy to knock down, which may not only damage the artifacts, but also cause a chain reaction of the entire railing collapsing, thus failing to protect the exhibits and artifacts. Summary of the Invention

[0004] The purpose of this invention is to provide a modular protective railing for collectibles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A splicing type protective railing for collectibles includes a railing body, a connecting mechanism fixedly connected to the upper end of the railing body, a support mechanism provided inside the railing body, a conical cylinder fixedly connected inside the railing body, and a self-balancing mechanism fixedly connected to the bottom end of the railing body. The guardrail body includes a guardrail base, a guardrail rod is movably connected to the upper end of the guardrail base, a sleeve is rotatably sleeved to the upper end of the guardrail rod, a protective rod is rotatably connected inside the sleeve, a corrugated groove is formed on the surface of the protective rod, and a slider is fixedly connected inside the sleeve, the slider slidingly engaging with the corrugated groove.

[0006] Preferably, the connecting mechanism includes a guardrail body connecting box, which is fixedly connected to the top of the guardrail bar. A warning tape connecting box is detachably connected to the side of the guardrail body connecting box. Warning tape mounting slots are fixedly connected to the sides of the warning tape connecting box and the guardrail body connecting box, respectively. The interiors of the warning tape connecting box and the guardrail body connecting box are connected, and rotating rods are rotatably connected to each other. A semicircular block is fixedly connected to one end of the rotating rod, and an L-shaped rod is connected between the two semicircular blocks. The other end of the rotating rod inside the warning tape connection box is fixedly connected to a knob. The surface of the semicircular block is provided with an L-shaped rod mounting groove. One end of the L-shaped rod is rotatably installed in the L-shaped rod mounting groove of one of the semicircular blocks, and the other end is hinged to another semicircular block. A spring is provided between one of the semicircular blocks and the inner wall of the guardrail body connecting box, and between the other semicircular block and the inner wall of the warning tape connecting box. A limiting rod for limiting the semicircular block is fixedly connected inside the guardrail body connecting box and the warning tape connecting box, and a support rod for supporting the L-shaped rod is fixedly connected inside the guardrail body connecting box and the warning tape connecting box.

[0007] Preferably, the support mechanism includes an L-shaped limiting plate, which is fixedly connected to the inner wall of the guardrail. A V-shaped rod is hinged to the outer wall of the guardrail. One end of the V-shaped rod passes through the guardrail and engages with the L-shaped limiting plate. The other end of the V-shaped rod is located on the outside of the guardrail and has a telescopic spring inside. A sliding rod is slidably connected inside the V-shaped rod. The telescopic spring abuts against the sliding rod. The bottom end of the sliding rod extends out of the V-shaped rod and is fixedly connected to an arc-shaped support rod. The upper end of the conical cylinder is fixedly connected to a cross groove, and slide rod one and slide rod two are slidably connected inside the cross groove. Slide rod one is provided with a sliding groove through which slide rod two slides. Arc-shaped push rods are fixedly connected to the two ends of slide rod one and slide rod two respectively.

[0008] Preferably, the self-balancing mechanism includes a universal joint, which is fixedly connected to the inner wall of the guardrail base. Multiple universal joints are provided and distributed circumferentially along the inner wall of the guardrail base. Each universal joint is hinged with a spring telescopic rod, and each spring telescopic rod is fixedly connected with an arc-shaped piece. A spring telescopic rod two is fixedly connected to the bottom of the guardrail base. A universal joint is fixedly connected to the top of the spring telescopic rod two. A base plate is fixedly connected to the top of the universal joint. A connecting rod is provided between the arc-shaped piece and the base plate. The arc-shaped piece is arranged around the connecting rod.

[0009] Preferably, the conical cylinder is a hollow structure, with its upper end movably connected to the guardrail and its lower end fixedly connected to the guardrail base.

[0010] Preferably, the slider is slidably disposed within the corrugated groove, and the protective rod rotates inside the sleeve via the slider and the corrugated groove.

[0011] Preferably, the connecting rod is inside the tapered cylinder and is fixedly connected to the bottom of the guardrail.

[0012] This invention provides a method for using a modular protective railing for collectibles, comprising the following steps: S1. Arrange the railing bodies according to the protection range of the collection, and connect the railing body connection box and the warning tape connection box on the adjacent railing bodies with the warning tape. S2. When there are requirements for the placement height of the guardrail body, rotate the sleeve and adjust the guardrail to raise or lower it; S3. During use, when someone touches or squeezes the guardrail body, the guardrail and the guardrail rod shake at the top of the guardrail base, causing the L-shaped limiting plate fixed on the inner wall of the guardrail to squeeze the arc-shaped push rod. The arc-shaped push rod pushes the slide rod one or slide rod two to slide inside the cross slide groove, causing the arc-shaped push rod at the other end to squeeze the V-shaped rod at the other end, causing the V-shaped rod to rotate. The V-shaped rod will also push out the slide rod through the telescopic spring, and at the same time push out the arc-shaped support rod, forming a triangular frame structure with the ground. S4. When the guardrail is tilted, the guardrail will also tilt the connecting rod fixed at the lower end. The connecting rod will press the arc-shaped plate to press the spring telescopic rod one, and deflect through the universal joint. When the guardrail loses the external pressure, the unpressed spring telescopic rod one will reset the connecting rod through the tension of the spring and the thrust of the pressed spring telescopic rod one. The bottom will also be corrected and reset through the spring telescopic rod two. S5. When it is necessary to store the guardrail body, remove the warning tape between the guardrail body connecting box and the warning tape connecting box on the adjacent guardrail body and store it. S6. When it is necessary to disassemble the protective railing of the collection, turn the knob. The knob turns, which drives the rotating rod to rotate. The rotating rod drives the semicircular block to rotate. The semicircular block rotates and pushes out the L-shaped rod in its L-shaped rod mounting slot. At the same time, it pushes out the other L-shaped rod from the L-shaped rod mounting slot of the two semicircular blocks, thus disassembling the railing body connecting box and the warning tape connecting box.

[0013] In this invention, when the guardrail is no longer compressed after being squeezed, the pushing force of the squeezed spring telescopic rod one and the other spring telescopic rods one will reset the connecting rod through the tension of the spring, and the bottom will also be corrected and reset through the spring telescopic rod two. In this way, the guardrail will be reset through the connecting rod after being squeezed, and continue to maintain the protective state.

[0014] In this invention, the sliding rod is pushed out by a telescopic spring at the other end of the V-shaped rod, and the arc-shaped support rod is pushed out at the same time. When the guardrail is squeezed, the arc-shaped support rod forms a triangular frame with the ground to support the guardrail. This can prevent the guardrail from falling over when squeezed, thus improving the safety and practicality of the guardrail.

[0015] In this invention, two semi-circular blocks interlock with each other to secure the L-shaped rod, thus connecting one end of the protective fence to the warning tape and interlocking them until the site is fully protected. This facilitates installation and allows the fence to be quickly set up on site. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the guardrail body structure of the present invention; Figure 3 This is an enlarged structural diagram of the guardrail body of the present invention; Figure 4 For the present invention Figure 2 A schematic diagram of the enlarged structure of A in the middle; Figure 5 This is a schematic diagram of the connection mechanism structure of the present invention; Figure 6 This is a side cross-sectional view of the connecting mechanism of the present invention; Figure 7 This is a cross-sectional view of the connecting mechanism of the present invention from the other side; Figure 8 This is a schematic diagram of the side cross-sectional structure of the guardrail body of the present invention; Figure 9 This is a partially enlarged structural diagram of the support mechanism of the present invention; Figure 10 This is a schematic cross-sectional view of the cross groove structure of the present invention; Figure 11 This is a magnified schematic diagram of the self-balancing mechanism of the present invention.

[0017] In the diagram: 1. Guardrail body; 2. Connecting mechanism; 3. Supporting mechanism; 4. Conical cylinder; 5. Self-balancing mechanism; 11. Guardrail base; 12. Guardrail post; 13. Sleeve; 14. Protective rod; 15. Corrugated groove; 16. Sliding block; 21. Guardrail body connection box; 22. Warning tape connection box; 23. Warning tape mounting slot; 24. Rotating rod; 25. Knob; 26. Semicircular block; 27. L-shaped rod; 28. Spring 1; 29. ​​Limiting rod; 210. Support rod; 31. L-shaped limiting plate; 32. V-shaped rod; 33. Telescopic spring; 34. Sliding rod; 35. Arc-shaped support rod; 36. Cross slide groove; 37. Sliding rod 1; 38. Sliding rod 2; 39. Arc-shaped push rod; 51. Universal joint; 52. Spring telescopic rod 1; 53. Arc-shaped piece; 54. Spring telescopic rod 2; 55. Universal shaft; 56. Base plate; 57. Connecting rod. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1 to 11 A splicing type protective railing for collectibles includes a railing body 1, a connecting mechanism 2 fixedly connected to the upper end of the railing body 1, a support mechanism 3 provided inside the railing body 1, a conical cylinder 4 fixedly connected inside the railing body 1, and a self-balancing mechanism 5 fixedly connected to the bottom end of the railing body 1. The conical cylinder 4 is a hollow structure, with its upper end movably connected to the railing rod 12 and its lower end fixedly connected to the railing base 11.

[0020] The guardrail body 1 includes a guardrail base 11, with a guardrail rod 12 movably connected to the upper end of the guardrail base 11. A sleeve 13 is rotatably sleeved on the upper end of the guardrail rod 12, and a protective rod 14 is rotatably connected inside the sleeve 13. A corrugated groove 15 is formed on the surface of the protective rod 14, and a slider 16 is fixedly connected inside the sleeve 13. The slider 16 slides in the corrugated groove 15. When the sleeve 13 rotates, it drives the slider 16 to rotate. The slider 16 slides in the corrugated groove 15 on the surface of the protective rod 14 and rises and falls through the corrugated groove 15. This allows for protection in places with varying terrain and required protection height.

[0021] In this embodiment, the connecting mechanism 2 includes a guardrail body connecting box 21, which is fixedly connected to the top of the guardrail rod 14. A warning tape connecting box 22 is detachably connected to the side of the guardrail body connecting box 21. Warning tape mounting slots 23 are fixedly connected to the sides of the warning tape connecting box 22 and the guardrail body connecting box 21, respectively. The interiors of the warning tape connecting box 22 and the guardrail body connecting box 21 are connected, and rotating rods 24 are rotatably connected to each other. A semicircular block 26 is fixedly connected to one end of the rotating rod 24, and an L-shaped rod 27 is connected between the two semicircular blocks 26. The other end of the rotating rod 24 inside the warning tape connecting box 22 is fixedly connected to a knob 25. The surface of the semicircular block 26 is provided with an L-shaped rod mounting groove. One end of the L-shaped rod 27 is rotatably installed in the L-shaped rod mounting groove of the semicircular block 26, and the other end is hinged to the other semicircular block. Springs 28 are respectively installed between one half of the circular block 26 and the inner wall of the guardrail body connecting box 21, and between the other half of the circular block 26 and the inner wall of the warning tape connecting box 22. Limiting rods 29 for limiting the semicircular block 26 are fixedly connected inside the guardrail body connecting box 21 and the warning tape connecting box 22. Support rods 210 for supporting L-shaped rods 27 are fixedly connected inside the guardrail body connecting box 21 and the warning tape connecting box 22. The two semicircular blocks 26 will lock the L-shaped rods 27 in place, connecting the guardrail to the warning tape. This facilitates quick installation and on-site placement of the guardrail. When the rotating rod 24 rotates, it drives the semicircular block 26 to rotate. When the semicircular block 26 rotates, it pushes out the L-shaped rod 27 locked inside. At the same time, the other end pushes out the other L-shaped rod 27 through the reaction force, which facilitates quick disassembly and saves a lot of time.

[0022] In this embodiment, the support mechanism 3 includes an L-shaped limiting plate 31, which is fixedly connected to the inner wall of the guardrail 12. A V-shaped rod 32 is hinged to the outer wall of the guardrail 12. One end of the V-shaped rod 32 passes through the guardrail 12 and cooperates with the L-shaped limiting plate 31. The other end of the V-shaped rod 32 is located outside the guardrail 12, and a telescopic spring 33 is provided inside it. A sliding rod 34 is slidably connected inside the V-shaped rod 32. The telescopic spring 33 abuts against the sliding rod 34. The bottom end of the sliding rod 34 extends out of the V-shaped rod 32 and is fixedly connected to an arc-shaped support rod 35. The upper end of the conical cylinder 4 is fixedly connected to a cross groove 36. Inside the cross groove 36, a sliding rod 37 and a sliding rod 38 are slidably connected. The sliding rod 37 is provided with a sliding groove through which the sliding rod 38 slides. Arc-shaped push rods 39 are fixedly connected to the two ends of the sliding rod 37 and the sliding rod 38, respectively.

[0023] In this way, when the guardrail is squeezed, the arc-shaped support rod 35 will be pushed out to form a triangular frame with the ground, supporting the guardrail and preventing it from falling over when squeezed, thus improving the safety and practicality of the guardrail. The interior of the sliding rod 37 is hollow, and the sliding rod 38 slides inside the sliding rod 37, so that the arc-shaped support rod 35 can be opened when squeezed at any angle.

[0024] In this embodiment, the self-balancing mechanism 5 includes a universal joint 51. The universal joint 51 is fixedly connected to the inner wall of the guardrail base 11. Multiple universal joints 51 are provided and distributed circumferentially along the inner wall of the guardrail base 11. Each universal joint 51 is hinged to a spring telescopic rod 52. Each spring telescopic rod 52 is fixedly connected to an arc-shaped piece 53. A spring telescopic rod 54 is fixedly connected to the bottom of the guardrail base 11. A universal joint 55 is fixedly connected to the top of the spring telescopic rod 54. A base plate 56 is fixedly connected to the top of the universal joint 55. A connecting rod 57 is provided between the arc-shaped piece 53 and the base plate 56. The arc-shaped piece 53 is arranged around the connecting rod 57.

[0025] When the guardrail is no longer compressed after being squeezed, the pushing force of the squeezed spring telescopic rod 52 and the tension of the other spring telescopic rods 52 will reset the connecting rod 57 through the spring tension. The bottom will also be corrected and reset through the spring telescopic rod 54. In this way, when the guardrail is not squeezed, it will be reset through the connecting rod 57 and continue to maintain the protective state.

[0026] In this embodiment, the connecting rod 57 is inside the tapered cylinder 4 and is fixedly connected to the bottom of the guardrail 12.

[0027] This invention provides a method for using a modular protective railing for collectibles, comprising the following steps: S1. Connect the guardrail body connection box 21 and the warning tape connection box 22 of the guardrail body 1 with a snap-fit, then place them according to the protection range of the collection, and connect the guardrail body connection box 21 and the warning tape connection box 22 on the adjacent guardrail body 1 with the warning tape. Specifically, when one end of the warning tape connection box 22 is inserted into the interior of the guardrail body connection box 21, the L-shaped rod 27 is supported by the support rod 210. The L-shaped rod 27 will press against the semicircular block 26. When the semicircular block 26 is pressed, it rotates through the rotating rod 24. Then the L-shaped rod 27 slides on the surface of the semicircular block 26 until it slides into the L-shaped rod mounting groove on the semicircular block 26. After that, the semicircular block 26 will return to its initial state through the spring 28. The two semicircular blocks 26 will be connected to each other through the L-shaped rod 27, realizing the quick installation of the guardrail body connection box 21 and the warning tape connection box 22. S2. When there is a requirement for the placement height of the guardrail body 1, rotate the sleeve 13 to adjust the guardrail 14 for raising and lowering. When the sleeve 13 rotates, it drives the slider 16, which is fixedly connected inside, to rotate. The slider 16 will slide in the corrugated groove 15 opened on the surface of the guardrail 14, and at the same time, it will be raised and lowered through the corrugated groove 15. S3. During use, when someone touches or squeezes the guardrail body 1, the guardrail 12 and the guardrail 14 sway at the upper end of the guardrail base 11, causing the L-shaped limiting plate 31 fixed on the inner wall of the guardrail 12 to squeeze the arc-shaped push rod 39. The arc-shaped push rod 39 pushes the slide rod 1 37 or the slide rod 2 38 to slide inside the cross groove 36, causing the arc-shaped push rod 39 at the other end to squeeze the V-shaped rod 32 at the other end, causing the V-shaped rod 32 to rotate through the hinge point. The V-shaped rod 32 will push out the slide rod 34 through the telescopic spring 33, and at the same time push out the arc-shaped support rod 35, forming a triangular frame structure with the ground. S4. When the guardrail 12 tilts, the guardrail 12 will cause the connecting rod 57 fixedly connected at the lower end to tilt at the same time. The connecting rod 57 will press the arc-shaped piece 53 to press the spring telescopic rod 52 and deflect through the universal joint. When the guardrail loses the external pressure, the unpressed spring telescopic rod 52 will reset the connecting rod 57 through the tension of the spring and the thrust of the pressed spring telescopic rod 52. The bottom will also be corrected and reset through the spring telescopic rod 54. S5. When it is necessary to store the guardrail body 1, remove the warning tape between the guardrail body connecting box 21 and the warning tape connecting box 22 on the adjacent guardrail body 1 and store it. S6. When it is necessary to disassemble the protective railing of the collection, turn knob 25. The rotation of knob 25 drives the rotating rod 24 to rotate, which in turn drives the semicircular block 26 to rotate. The semicircular block 26 rotates and pushes out the L-shaped rod 27 from its L-shaped rod mounting slot. At the same time, it pushes out another L-shaped rod 27 from the L-shaped rod mounting slot of the two semicircular blocks 26, thus disassembling the railing body connecting box 21 and the warning tape connecting box 22. The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spliced ​​type protective railing for collectibles, comprising a railing body (1), characterized in that: The upper end of the guardrail body (1) is fixedly connected to a connecting mechanism (2), the inside of the guardrail body (1) is provided with a support mechanism (3), the inside of the guardrail body (1) is fixedly connected to a conical cylinder (4), and the bottom of the inside of the guardrail body (1) is fixedly connected to a self-balancing mechanism (5). The guardrail body (1) includes a guardrail base (11), a guardrail rod (12) is movably connected to the upper end of the guardrail base (11), a sleeve (13) is rotatably sleeved on the upper end of the guardrail rod (12), a protective rod (14) is rotatably connected inside the sleeve (13), a corrugated groove (15) is opened on the surface of the protective rod (14), and a slider (16) is fixedly connected inside the sleeve (13), and the slider (16) slides in cooperation with the corrugated groove (15).

2. The spliced ​​type protective railing for collectibles according to claim 1, characterized in that: The connecting mechanism (2) includes a guardrail body connecting box (21), which is fixedly connected to the top of the guardrail rod (14). A warning tape connecting box (22) is detachably connected to the side of the guardrail body connecting box (21). Warning tape mounting slots (23) are fixedly connected to the sides of the warning tape connecting box (22) and the guardrail body connecting box (21). The interiors of the warning tape connecting box (22) and the guardrail body connecting box (21) are connected, and rotating rods (24) are rotatably connected to them respectively. A semicircular block (26) is fixedly connected to one end of the rotating rod (24), and an L-shaped rod (27) is connected between the two semicircular blocks (26). The other end of the rotating rod (24) inside the warning tape connection box (22) is fixedly connected to a knob (25). The surface of the semicircular block (26) is provided with an L-shaped rod mounting groove. One end of the L-shaped rod (27) is rotatably installed in the L-shaped rod mounting groove of one of the semicircular blocks (26), and the other end is hinged to another semicircular block (26). A spring (28) is provided between one of the semicircular blocks (26) and the inner wall of the guardrail body connecting box (21), and between the other semicircular block (26) and the inner wall of the warning tape connecting box (22). A limiting rod (29) for limiting the semicircular block (26) is fixedly connected inside the guardrail body connecting box (21) and the warning tape connecting box (22). A support rod (210) for supporting the L-shaped rod (27) is fixedly connected inside the guardrail body connecting box (21) and the warning tape connecting box (22).

3. The spliced ​​type protective railing for collectibles according to claim 2, characterized in that: The support mechanism (3) includes an L-shaped limiting plate (31), which is fixedly connected to the inner wall of the guardrail (12). A V-shaped rod (32) is hinged to the outer wall of the guardrail (12). One end of the V-shaped rod (32) passes through the guardrail (12) and cooperates with the L-shaped limiting plate (31). The other end of the V-shaped rod (32) is located outside the guardrail (12) and is provided with a telescopic spring (33). A sliding rod (34) is slidably connected inside the V-shaped rod (32). The telescopic spring (33) abuts against the sliding rod (34). The bottom end of the sliding rod (34) extends out of the V-shaped rod (32) and is fixedly connected with an arc-shaped support rod (35). The upper end of the conical cylinder (4) is fixedly connected to a cross groove (36). The inside of the cross groove (36) is slidably connected to a slide rod one (37) and a slide rod two (38). The slide rod one (37) is provided with a sliding groove through which the slide rod two (38) slides. The two ends of the slide rod one (37) and the slide rod two (38) are respectively fixedly connected to an arc-shaped push rod (39).

4. The spliced ​​type protective railing for collectibles according to claim 3, characterized in that: The self-balancing mechanism (5) includes a universal joint (51), which is fixedly connected to the inner wall of the guardrail base (11). Multiple universal joints (51) are provided and distributed circumferentially along the inner wall of the guardrail base (11). Each universal joint (51) is hinged with a spring telescopic rod (52), and each spring telescopic rod (52) is fixedly connected with an arc-shaped piece (53). The bottom of the guardrail base (11) is fixedly connected to a spring telescopic rod two (54), the top of the spring telescopic rod two (54) is fixedly connected to a universal joint (55), the top of the universal joint (55) is fixedly connected to a base plate (56), a connecting rod (57) is provided between the arc-shaped piece (53) and the base plate (56), and the arc-shaped piece (53) is arranged around the connecting rod (57).

5. The spliced ​​type protective railing for collectibles according to claim 1, characterized in that: The conical cylinder (4) is a hollow structure, with its upper end movably connected to the guardrail (12) and its lower end fixedly connected to the guardrail base (11).

6. The spliced ​​type protective railing for collectibles according to claim 1, characterized in that: The slider (16) is slidably disposed in the corrugated groove (15), and the protective rod (14) rotates inside the sleeve (13) through the slider (16) and the corrugated groove (15).

7. A spliced ​​type protective railing for collectibles according to claim 4, characterized in that: The connecting rod (57) is inside the conical tube (4) and is fixedly connected to the bottom of the guardrail (12).

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