Elastic self-closing railing door

Abstract

The invention relates to the technical field of railing doors, and discloses an elastic self-closing railing door which comprises a door body, a first fence is arranged on one side of the door body, and two self-closing devices distributed up and down are connected to one side of the first fence and one side of the door body; the self-closing device comprises a fixing plate welded to one side of the first fence, and the top end of the fixing plate is fixedly connected with a fixing sleeve. Automatic closing of the door body is achieved through the self-closing device, one-way opening of the door body is achieved on the basis of self-locking closing through the special-shaped sliding face, the closing speed of the door body is increased through the first springback assembly and the second springback assembly, the door body can be closed as soon as possible after a person passes through the door body, and the safety of the person is improved. The safety is improved, and by means of the mutual replaceability between the first rebound assembly and the second rebound assembly, the subsequent maintenance cost is reduced, and the disassembly and replacement difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of railing doors, in particular to an elastic self-closing railing door. Background Art

[0002] Self-closing railing door is one of the products widely used in shipbuilding and marine engineering projects. It is a rotatable railing set in the middle of the guardrail. It is usually used in the upper and lower openings of the straight ladder of the platform railing, or in the middle of the closed fence for people to enter and exit.

[0003] Chinese patent authorization announcement number CN220281602U discloses an elastic self-closing railing door, including: a main body, one side of which is provided with at least two connecting parts along the gravity direction, and the other side is provided with at least one clamping part along the gravity direction so as to be clamped on the deck railing or guardrail; the railing door has a simple structure, is easy to process and manufacture, and has low cost. The railing door is fixed by a prefabricated installation clamp, which is conducive to reducing the workload of on-site outfitting and installation and shortening the construction period.

[0004] The above-mentioned prior art solution has the following shortcomings: the railing door mainly utilizes the elasticity of the spring to drive the spring to twist and reset when the railing door is opened and closed, so as to realize automatic resetting and closing of the railing door. However, in this structure, since the spring is located between the upper and lower rings, and a connecting part connected to the railing door is also connected between the two rings, and the elastic performance of the spring decreases due to long-term opening and closing use, when the spring is repaired and replaced in this structure, the ring and the railing door need to be removed from the sleeve rod before the spring can be removed. That is, the subsequent maintenance operation of the railing door is relatively cumbersome, and since the connecting part in the structure needs to cause the sleeve rod to generate rotational friction for a long time, and since the railing door is in an open environment, it is not provided with a corresponding lubrication structure, which makes the railing door prone to rust and jam after a long time, and then there is a certain room for improvement. Summary of the invention

[0005] The object of the present invention is to provide an elastic self-closing railing door to solve the problem that the existing elastic self-closing railing door proposed in the above background technology is difficult to carry out subsequent maintenance and replacement, and is prone to getting stuck.

[0006] To achieve the above object, the present invention provides the following technical solution: an elastic self-closing railing door, comprising a door body, a fence 1 is arranged on one side of the door body, and one side of the fence 1 and one side of the door body are connected to two self-closing devices distributed up and down; The self-closing device comprises a fixing plate welded to one side of the fence, and the top end of the fixing plate is fixedly connected with a fixing sleeve, the fixing sleeve is fixedly connected with a left chain plate on a side close to the fence, and one side of the left chain plate is fixedly connected to one side of the fence, a fixing rod is passed through the interior of the fixing sleeve, and the bottom end of the fixing rod is fixedly connected to the top end of the fixing plate, a threaded rod is arranged on the top end of the fixing rod, a movable sleeve is arranged on the outside of the fixing rod, and one side of the movable sleeve is fixedly connected with a right chain plate, and one side of the right chain plate is fixedly connected to one side of the door body, the abutting ends of the movable sleeve and the fixed sleeve are both provided with special-shaped sliding surfaces, and the two adjacent special-shaped sliding surfaces are matched with each other to realize the self-locking limit of the door body, the top end of the movable sleeve is fixedly connected with a fixing ring, and the fixing ring is sleeved on the outside of the fixing rod, a rebound component 1 is arranged on the outside of the threaded rod, and the bottom end of the rebound component 1 abuts against the top end of the fixing ring to increase the closing speed of the door body; A lubrication mechanism is arranged outside the movable sleeve to realize automatic lubrication between the movable sleeve and the fixed rod.

[0007] Preferably, the rebound component includes a locking nut threadedly mounted on the top end of the threaded rod, and a nut washer is mounted on the outside of the threaded rod below the locking nut, and a spring is mounted on the outside of the threaded rod between the nut washer and the fixing ring, and the spring is in a compressed state.

[0008] Preferably, a rebound component 2 is also provided on the outside of the threaded rod, and the rebound component 2 includes a locking nut 2 mounted on the outside of the threaded rod, and two locking nuts 2 are provided, and the two locking nuts 2 are distributed up and down on the threaded rod, and two nut washers 2 distributed up and down are mounted on the threaded rod between the two locking nuts 2, and a torsion spring is mounted on the threaded rod between the two nut washers 2, and the two ends of the torsion spring are respectively against the door body and one side of the fence 1.

[0009] Preferably, the locking nut 2 has the same structure as the locking nut 1, the nut gasket 2 has the same structure as the nut gasket 1, and the bottom end of the locking nut 2 located below is spaced apart from the top end of the fixing ring.

[0010] Preferably, the special-shaped sliding surface is composed of an inclined surface and a right-angle surface connected end to end, and the inclined surface faces the opening side of the door body. The ratio of the projection length of the inclined surface to the projection length of the right-angle surface is 3:1, so that the door body can only be opened in one direction in the initial state.

[0011] Preferably, the lubrication mechanism includes an annular groove formed on the outside of the movable sleeve, and the inner wall of the annular groove is evenly provided with through holes, the outer side of the movable sleeve is provided with an annular cover, and the annular cover surrounds the annular groove, balls are embedded in the through holes, and one side of the ball abuts against the inner wall of the annular cover, and the other side of the ball abuts against the outer wall of the fixed rod, and a butter nipple passes through the outer side of the annular cover.

[0012] Preferably, fence two is provided on the side of the door body relative to fence one, and a limiting mechanism is provided on the side of the door body relative to the self-closing device, and one side of the limiting mechanism is abutted against one side of fence two, and the limiting mechanism is on the opening side of the door body to further prevent the door body from opening in the opposite direction and to close and position the door body at the same time.

[0013] Preferably, the limiting mechanism includes a thick steel plate welded to one side of the door body, and a thick rubber is fixedly connected to the side of the thick steel plate close to fence 2, a fixing box is fixedly installed on one side of the thick steel plate relative to the thick rubber, a magnet is placed inside the fixing box, and a screw is connected through the outer side of the magnet and the fixing box.

[0014] Preferably, the outer side of the thick rubber abuts against one side of the fence 2, and the abutting side of the thick rubber and the fence 2 is a curved surface.

[0015] Preferably, the magnet generates an attractive force on the fence 2, and the magnet and the fixing box are detachably connected by screws.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The special-shaped sliding surface allows the door body to only drive the movable sleeve to rotate in one direction along the inclined surface of the special-shaped sliding surface on the fixed sleeve when the door body starts to rotate, thereby preventing the door body from opening in the opposite direction. The structure is simple and achieves a certain self-locking effect. At the same time, since the abutting ends of the movable sleeve and the fixed sleeve during the opening process are inclined structures, the door body can reset itself under the action of its own weight after opening, thereby achieving the self-closing effect of the door body. In addition, since this opening method raises the height of the door body, it can compress the spring. Under the action of the elastic reset force of the spring, the door body is subjected to a downward extrusion force after opening, thereby promoting the reverse rotation of the movable sleeve relative to the fixed sleeve, so as to further improve the closing reset rate of the door body. And due to the threaded connection between the locking nut 1, the nut washer 1 and the threaded rod, the compression degree of the spring can be adjusted, thereby adjusting the elastic force of the spring, so as to further adjust the closing speed of the door body, while reducing the influence of the elasticity decrease of the spring under the use of length; By utilizing the function of the second rebound component, the first rebound component is then replaced, thereby improving the flexibility of replacing the self-closing device. At the same time, due to the different directions of the elastic force of the torsion spring, the automatic closing mode of the door body is changed, and the steps of subsequent maintenance operations of the self-closing device are reduced, thereby reducing the difficulty of maintenance. (2) Through the action of the lubrication mechanism, when the movable sleeve rotates along the outside of the fixed rod, the friction of the ball bearings is utilized to enable the ball bearings to automatically discharge the lubricating oil stored in the annular groove to the outside, thereby improving the smoothness of the rotation of the movable sleeve and reducing the risk of jamming. At the same time, since the movement of the ball bearings is affected by the rotation of the movable sleeve, the automatic discharge of the lubricating oil when the door body is in a long-term closed state is avoided, thereby reducing the waste of lubricating oil; (3) The deformation of the thick rubber can reduce the impact force between the door body and the fence when closing, thereby reducing the damage to the thick steel plate. At the same time, the blocking effect of the thick steel plate can be used to further prevent the door body from opening in the opposite direction. The magnetic attraction of the magnet can further reduce the rebound of the thick steel plate after the impact, thereby promoting the stability of the door body closing and reducing the self-vibration effect of the spring or torsion spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the door body of the present invention; Figure 3 It is a schematic diagram of a three-dimensional structure of a rebound component of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the fixing sleeve of the present invention; Figure 5 It is a perspective three-dimensional structural diagram of the fixed sleeve and the movable sleeve of the present invention; Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the movable sleeve of the present invention; Figure 7 It is a schematic diagram of the installation three-dimensional structure of the rebound component 2 of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point A in the middle.

[0019] Explanation of the reference numerals in the figure: 1. door body; 2. fence one; 3. fence two; 4. fixed sleeve; 5. left chain plate; 6. right chain plate; 7. movable sleeve; 8. limiting mechanism; 801. thick steel plate; 802. thick rubber; 803. fixing box; 804. magnet; 805. screw; 9. fixing ring; 10. lubrication mechanism; 1001. annular groove; 1002. annular cover; 1003. through hole; 1004. ball bearing; 1005. butter nozzle; 11. fixing rod; 12. threaded rod; 13. rebound component one; 1301. locking nut one; 1302. nut gasket one; 1303. spring; 14. rebound component two; 1401. locking nut two; 1402. nut gasket two; 1403. torsion spring; 15. special-shaped sliding surface; 16. fixing plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention. Example

[0021] In order to solve the problem that the existing elastic self-closing railing door is difficult to maintain and easy to get stuck, the following solution is disclosed, specifically as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown: An elastic self-closing railing door comprises a door body 1, a fence 2 is arranged on one side of the door body 1, and one side of the fence 2 and one side of the door body 1 are connected to two self-closing devices distributed up and down; The self-closing device includes a fixing plate 16 welded to one side of the fence 2, and the top of the fixing plate 16 is fixedly connected to a fixing sleeve 4, the side of the fixing sleeve 4 close to the fence 2 is fixedly connected to a left chain plate 5, and one side of the left chain plate 5 is fixedly connected to one side of the fence 2, a fixing rod 11 is passed through the inside of the fixing sleeve 4, and the bottom end of the fixing rod 11 is fixedly connected to the top of the fixing plate 16, a threaded rod 12 is provided at the top of the fixing rod 11, and a movable sleeve 7 is provided on the outside of the fixing rod 11, and one side of the movable sleeve 7 is fixedly connected There is a right chain plate 6, and one side of the right chain plate 6 is fixedly connected to one side of the door body 1, the abutting ends of the movable sleeve 7 and the fixed sleeve 4 are both provided with special-shaped sliding surfaces 15, and the two adjacent special-shaped sliding surfaces 15 are mutually matched to achieve the self-locking limit of the door body 1, the top of the movable sleeve 7 is fixedly connected with a fixing ring 9, and the fixing ring 9 is sleeved on the outside of the fixing rod 11, and a rebound component 13 is provided on the outside of the threaded rod 12, and the bottom end of the rebound component 13 is abutted against the top of the fixing ring 9 to increase the closing speed of the door body 1; A lubrication mechanism 10 is provided outside the movable sleeve 7 to achieve automatic lubrication between the movable sleeve 7 and the fixed rod 11; The rebound component 13 includes a locking nut 1301 threadedly sleeved on the top of the outer side of the threaded rod 12, and a nut washer 1302 is sleeved on the outer side of the threaded rod 12 below the locking nut 1301, and a spring 1303 is sleeved on the outer side of the threaded rod 12 between the nut washer 1302 and the fixing ring 9, and the spring 1303 is in a compressed state; The special-shaped sliding surface 15 is composed of an inclined surface and a right-angle surface connected end to end, and the inclined surface faces the opening side of the door body 1, and the ratio of the projection length of the inclined surface to the projection length of the right-angle surface is 3: 1, so that the door body 1 can only be opened in one direction in the initial state; The lubrication mechanism 10 includes an annular groove 1001 opened on the outside of the movable sleeve 7, and the inner wall of the annular groove 1001 is evenly provided with through holes 1003, the outer side of the movable sleeve 7 is provided with an annular cover 1002, and the annular cover 1002 surrounds the annular groove 1001, and the interior of the through holes 1003 is embedded with balls 1004, and one side of the ball 1004 is against the inner wall of the annular cover 1002, and the other side of the ball 1004 is against the outer wall of the fixed rod 11, and a butter nozzle 1005 passes through the outer side of the annular cover 1002.

[0022] In this embodiment, when in use, one side of the door body 1 is pushed to make the movable sleeve 7 slide along the inclined surface of the special-shaped sliding surface 15 on the fixed sleeve 4, so that the movable sleeve 7 generates an upward rotation to drive the door body 1 to open upwardly, and because the movable sleeve 7 moves upward along the outside of the fixed rod 11, the fixed ring 9 squeezes the spring 1303, compressing the spring 1303. When a person passes through the door body 1, the thrust on the door body 1 is released; Since the movable sleeve 7 is always located on the inclined surface of the special-shaped sliding surface 15 on the fixed sleeve 4 at this time, the door body 1 slides down along the inclined surface under the action of its own gravity to automatically fall back and reset to the closing device of the door body 1, and since the movable sleeve 7 and the fixed sleeve 4 are restricted by the right-angle surface of the special-shaped sliding surface 15, the door body 1 cannot be opened in the reverse direction, achieving a certain self-locking effect, and due to the elastic reset force of the spring 1303 after the door body 1 is opened, the spring 1303 generates a downward squeezing force on the movable sleeve 7 through the fixed ring 9, thereby further promoting the reverse rotation reset rate of the movable sleeve 7, and then improving the automatic closing efficiency of the door body 1; By further screwing the locking nut 1301 downward, the distance between the nut washer 1302 and the fixing ring 9 is shortened, thereby changing the compression degree of the spring 1303, thereby adjusting the force degree of the movable sleeve 7, so as to further adjust the automatic closing rate of the door body 1, and at the same time, utilizing the spiral screwing effect between the locking nut 1301, the nut washer 1302 and the threaded rod 12, thereby reducing the disassembly and replacement effect of the spring 1303; When the movable sleeve 7 is opened and closed and rotated along the fixed rod 11, the ball 1004 is abutted against the fixed rod 11, thereby causing the ball 1004 to rotate, so that the ball 1004 drives the lubricating oil in the annular groove 1001 to flow to the outer surface of the fixed rod 11 through the through hole 1003, thereby reducing the friction between the movable sleeve 7 and the fixed rod 11, promoting the smooth rotation of the movable sleeve 7, reducing the phenomenon of jamming when the door body 1 is opened and closed, and improving the service life of the door body 1. Due to the action of the butter nozzle 1005, lubricating oil can be poured into the inside of the annular groove 1001 at any time, which is convenient for maintenance. At the same time, since the movement of the ball 1004 is affected by the rotation of the movable sleeve 7, the waste of lubricating oil is reduced, and the convenience of maintenance is further improved. Example

[0023] This embodiment is different from the first embodiment. By replacing the first rebound component 13 with the second rebound component 14, a new self-closing device is formed to reduce the subsequent maintenance and replacement steps. Figure 7 and Figure 8 As shown: A second rebound component 14 is also provided on the outside of the threaded rod 12. The second rebound component 14 includes a second locking nut 1401 sleeved on the outside of the threaded rod 12. Two second locking nuts 1401 are provided, and the two second locking nuts 1401 are distributed up and down on the threaded rod 12. Two nut washers 1402 distributed up and down are sleeved on the threaded rod 12 between the two second locking nuts 1401. A torsion spring 1403 is sleeved on the threaded rod 12 between the two second nut washers 1402. The two ends of the torsion spring 1403 are respectively against one side of the door body 1 and the fence 2. The locking nut 1401 has the same structure as the locking nut 1 1301 , and the nut washer 1402 has the same structure as the nut washer 1302 . The bottom end of the locking nut 1401 at the bottom is spaced apart from the top end of the fixing ring 9 .

[0024] In the present embodiment, two sets of locking nuts 1401 and nut washers 1402 are respectively sleeved on the threaded rod 12. By replacing the spring 1303 with the torsion spring 1403, when the door body 1 is opened, the two ends of the torsion spring 1403 are compressed, and the elastic reset of the torsion spring 1403 is utilized to push the door body 1 to rotate in the opposite direction and reset. This closing method is mainly affected by the elastic action of the torsion spring 1403, which generates the driving force required for automatic closing of the door body 1. When the replacement structure is disassembled and replaced, there is no need to disassemble the door body 1, and it mainly involves the screwing action of the thread, thereby reducing the cost of replacement and maintenance, and at the same time improving the overall flexibility of the self-closing device. Example

[0025] This embodiment is different from the first and second embodiments. The limiting mechanism 8 is used to further prevent the door body 1 from opening in the reverse direction and to promote the stability of the door body 1 when it is automatically closed. Figure 1 , Figure 3 , Figure 6 As shown: A fence 2 3 is provided on one side of the door body 1 relative to the fence 1 2, and a limiting mechanism 8 is provided on one side of the door body 1 relative to the self-closing device, and one side of the limiting mechanism 8 abuts against one side of the fence 2 3, and the limiting mechanism 8 is located on the opening side of the door body 1, so as to further prevent the door body 1 from opening in the reverse direction, and at the same time close the door body 1; The limiting mechanism 8 includes a thick steel plate 801 welded to one side of the door body 1, and a thick rubber 802 is fixedly connected to the side of the thick steel plate 801 close to the fence 2 3, a fixing box 803 is fixedly installed on the side of the thick steel plate 801 opposite to the thick rubber 802, and a magnet 804 is placed inside the fixing box 803, and a screw 805 is connected between the outer side of the magnet 804 and the fixing box 803; The outer side of the thick rubber 802 abuts against one side of the fence 2 3, and the abutting side of the thick rubber 802 and the fence 2 3 is a curved surface; The magnet 804 generates an attractive force on the fence 2 3 , and the magnet 804 and the fixing box 803 are detachably connected via screws 805 .

[0026] In this embodiment, when in use, since the thick steel plate 801 is located on the opening side of the door body 1, the interception cooperation between the thick steel plate 801 and the fence 23 is utilized to further prevent the door body 1 from opening in the opposite direction, thereby achieving the self-locking effect of the door body 1. At the same time, when the door body 1 is closed, the thick rubber 802 is utilized to reduce the impact force between the thick steel plate 801 and the fence 23, and the attraction of the fixing box 803 to the fence 23 is utilized to achieve the rapid fitting between the thick steel plate 801 and the fence 23 after touching, thereby reducing the vibration impact between the thick steel plate 801 and the fence 23, and further improving the closing stability of the door body 1.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elastic self-closing railing door, comprising a door body (1), characterized in that: A fence (2) is provided on one side of the door body (1), and one side of the fence (2) and one side of the door body (1) are connected to two self-closing devices distributed up and down; the self-closing device comprises a fixing plate (16) welded to one side of the fence (2), and the top of the fixing plate (16) is fixedly connected to a fixing sleeve (4), the fixing sleeve (4) is fixedly connected to a left chain plate (5) on the side close to the fence (2), and one side of the left chain plate (5) is fixedly connected to one side of the fence (2), a fixing rod (11) passes through the inside of the fixing sleeve (4), and the bottom end of the fixing rod (11) is fixedly connected to the top of the fixing plate (16), a threaded rod (12) is provided on the top of the fixing rod (11), and a movable sleeve (7) is provided on the outside of the fixing rod (11), and the movable sleeve (7) ) is fixedly connected to one side of a right chain plate (6), and one side of the right chain plate (6) is fixedly connected to one side of a door body (1); the abutting ends of the movable sleeve (7) and the fixed sleeve (4) are both provided with special-shaped sliding surfaces (15), and two adjacent special-shaped sliding surfaces (15) are mutually matched to achieve self-locking and limiting of the door body (1); the top end of the movable sleeve (7) is fixedly connected to a fixing ring (9), and the fixing ring (9) is sleeved on the outside of the fixing rod (11); the outside of the threaded rod (12) is provided with a rebound component (13), and the bottom end of the rebound component (13) abuts against the top end of the fixing ring (9) to increase the closing rate of the door body (1); the outside of the movable sleeve (7) is provided with a lubrication mechanism (10) to achieve automatic lubrication between the movable sleeve (7) and the fixed rod (11).

2. The elastic self-closing railing door according to claim 1, characterized in that: The rebound component (13) comprises a locking nut (1301) threadedly sleeved on the outer top end of the threaded rod (12), and a nut washer (1302) is sleeved on the outer part of the threaded rod (12) below the locking nut (1301), and a spring (1303) is sleeved on the outer part of the threaded rod (12) between the nut washer (1302) and the fixing ring (9), and the spring (1303) is in a compressed state.

3. The elastic self-closing railing door according to claim 2, characterized in that: The threaded rod (12) is also provided with a second rebound component (14) on the outside of the threaded rod (12), and the second rebound component (14) includes a second locking nut (1401) sleeved on the outside of the threaded rod (12), and two second locking nuts (1401) are provided, and the two second locking nuts (1401) are distributed up and down on the threaded rod (12), and the threaded rod (12) between the two second locking nuts (1401) is sleeved with two second nut gaskets (1402) distributed up and down, and the threaded rod (12) between the two second nut gaskets (1402) is sleeved with a torsion spring (1403), and the two ends of the torsion spring (1403) are respectively against the door body (1) and one side of the fence (2).

4. The elastic self-closing railing door according to claim 3, characterized in that: The locking nut 2 (1401) has the same structure as the locking nut 1 (1301), and the nut gasket 2 (1402) has the same structure as the nut gasket 1 (1302). The bottom end of the locking nut 2 (1401) located at the bottom is spaced apart from the top end of the fixing ring (9).

5. The elastic self-closing railing door according to claim 1, characterized in that: The special-shaped sliding surface (15) is composed of an inclined surface and a right-angle surface connected end to end, and the inclined surface faces the opening side of the door body (1). The ratio of the projection length of the inclined surface to the projection length of the right-angle surface is 3:1, so that the door body (1) can only be opened in one direction in the initial state.

6. The elastic self-closing railing door according to claim 1, characterized in that: The lubrication mechanism (10) comprises an annular groove (1001) formed on the outer side of the movable sleeve (7), and the inner side wall of the annular groove (1001) is evenly provided with through holes (1003); the outer side of the movable sleeve (7) is provided with an annular cover (1002), and the annular cover (1002) surrounds the annular groove (1001); balls (1004) are embedded in the interior of the through holes (1003), and one side of the balls (1004) abuts against the inner side wall of the annular cover (1002), and the other side of the balls (1004) abuts against the outer wall of the fixed rod (11); and a grease nipple (1005) passes through the outer side of the annular cover (1002).

7. The elastic self-closing railing door according to claim 1, characterized in that: A fence 2 (3) is arranged on one side of the door body (1) relative to the fence 1 (2), and a limiting mechanism (8) is arranged on one side of the door body (1) relative to the self-closing device, and one side of the limiting mechanism (8) abuts against one side of the fence 2 (3), and the limiting mechanism (8) is located on the opening side of the door body (1) to further prevent the door body (1) from opening in the reverse direction, while closing and positioning the door body (1).

8. The elastic self-closing railing door according to claim 7, characterized in that: The limiting mechanism (8) comprises a thick steel plate (801) welded to one side of the door body (1), and a thick rubber (802) is fixedly connected to the side of the thick steel plate (801) close to the fence 2 (3), a fixing box (803) is fixedly installed on the side of the thick steel plate (801) relative to the thick rubber (802), a magnet (804) is placed inside the fixing box (803), and a screw (805) is connected between the outer side of the magnet (804) and the fixing box (803).

9. The elastic self-closing railing door according to claim 8, characterized in that: The outer side of the thick rubber (802) abuts against one side of the fence 2 (3), and the abutting sides of the thick rubber (802) and the fence 2 (3) are curved.

10. The elastic self-closing railing door according to claim 8, characterized in that: The magnet (804) generates an attractive force on the fence 2 (3), and the magnet (804) and the fixing box (803) are detachably connected via screws (805).

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