A bulletproof door

Abstract

The present invention provides a bulletproof door collision, which belongs to the field of door collision technology. It solves the technical problem that the existing door collision structure may bounce off when the impact force on the door body is large. The bulletproof door collision includes a seat body and a collision head, the seat body is provided with a travel cavity, the inner end of the collision head is slidably fitted in the travel cavity, a damping member is provided between the inner end of the collision head and the seat body, and the collision head is provided with a friction member that can abut against the inner side wall of the travel cavity. When the collision head slides toward the outside of the seat body, the pressing force of the friction member on the inner side wall of the travel cavity gradually increases, and when the collision head slides toward the inside of the seat body, the pressing force of the friction member on the inner side wall of the travel cavity gradually decreases. The bulletproof door collision can effectively prevent the door body from rebounding and breaking free.

Description

Technical Field

[0001] The invention belongs to the technical field of door bumps and relates to a bulletproof door bump. Background Art

[0002] In order to prevent the door from rotating randomly due to external forces when it is opened, a door stopper is usually set between the lower back of the door and the wall. The current door stopper mainly uses the suction force of magnets to attract the suction seat and the suction column to fix the door. When the door rotates quickly during attraction, the suction seat and the suction column make a collision sound, which is also easy to damage the door stopper and shorten its service life. To solve this problem, technicians in the field add buffer components such as springs to the door stopper to absorb the impact of the door body through the deformation of the buffer component to achieve a silent effect.

[0003] The applicant has previously developed a reset air valve with authorization announcement number CN209637469U, which includes a seat body and a collision part axially connected to the seat body for sliding, a stroke cavity is provided between the collision part and the seat body, an air duct for discharging air medium out of the stroke cavity is opened on the cavity wall of the stroke cavity, an axially arranged elastic part is provided between the collision part and the seat body, and the collision part and the seat body can move relative to each other to squeeze the elastic part into a sheet shape.

[0004] The above door bump structure is simple and has good buffering effect. On this basis, the applicant further developed and intended to invent a door bump structure that can prevent the door body from bouncing off after collision. To achieve the above purpose, a person skilled in the art can easily consider: 1. Increase the magnetic attraction in the door bump to prevent it from bouncing off after collision; 2. Set a locking structure on the door bump or the door body to lock the two when a collision occurs, so that the two cannot be separated after the collision; 3. Set more buffer devices in the door bump to absorb and consume the energy when the door body collides. Summary of the invention

[0005] The present invention aims at the above-mentioned problems existing in the prior art and provides a bullet-proof door. The technical problem to be solved by the present invention is: how to prevent the door body from rebounding and breaking free.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A bulletproof door collision comprises a seat body and a collision head, wherein the seat body has a travel cavity, the inner end of the collision head is slidably fitted in the travel cavity, a damping member is provided between the inner end of the collision head and the seat body, and the characterised in that a friction member is provided on the collision head which can abut against the inner side wall of the travel cavity, when the collision head slides out of the seat body, the pressing force of the friction member on the inner side wall of the travel cavity gradually increases, and when the collision head slides into the seat body, the pressing force of the friction member on the inner side wall of the travel cavity gradually decreases.

[0008] The seat body is used to be fixed on the ground, wall or door body. The collision head cooperates with the seat body to slide axially within the range of the stroke cavity. The existing collision head will be equipped with magnetic suction parts such as magnets to cooperate with the matching suction seat. A damping part is arranged between the inner end of the collision head and the seat body. The damping part can be a damping rod or a compression spring, etc., which can produce a buffering effect on the collision head. By providing a friction member that can move radially along the collision head on the collision head, when the collision head slides toward the outside of the seat body, the pressing force between the friction member and the inner wall of the stroke cavity gradually increases, that is, the friction resistance of the collision head in the rebound process is increased, and when the collision head slides into the seat body, the pressing force between the friction member and the inner wall of the stroke cavity gradually decreases, and the friction resistance of the collision buffering process is controlled to be smaller and within an appropriate range. In this way, when the door body collides with the collision head and is attracted by the set magnet, the buffering damping of the door body is softer and the buffering stroke of the door body is extended, thereby fully absorbing the impact energy and avoiding the door body from bouncing off due to rigid collision. When the damping member begins to release the absorbed energy to push the collision head to drive the door body to start moving outward, the friction member can rub against the side wall of the stroke cavity to gradually consume the energy released by the damping member, and the longer buffering stroke can fully ensure that the friction member can fully consume the energy released by the damping member, thereby controlling the speed at which the door body moves into place as the collision head rebounds within the binding range of the magnetic attraction member, thereby effectively avoiding the door body from rebounding and breaking free.

[0009] In the above-mentioned bulletproof door collision, the inner side wall of the stroke cavity has a trumpet-shaped expansion section, and the end of the expansion section close to the bottom of the seat body is the large end. The friction member always has a tendency to move toward the inner side wall of the stroke cavity or always has a tendency to deform toward the inner side wall of the stroke cavity, and the friction member abuts against the side wall of the expansion section. By setting the inner side wall of the stroke cavity to have a trumpet-shaped expansion section that is small on the outside and large on the inside, when the collision head slides toward the seat body under the impact of the door body, the side wall size of the expansion section that constrains the expansion of the friction part will become larger and larger, and the rapid sliding process of the collision head and the process of the friction part moving or deforming toward the inner side wall of the stroke cavity will occur simultaneously, and there is no physical obstacle on the route of the friction part, so that the friction part can move to the bottom of the stroke cavity before it fully abuts against the side wall of the stroke cavity, thereby greatly reducing the friction resistance generated by it, and the smooth inclined transition of the side wall of the stroke cavity can provide a guide for the sliding of the friction part, thereby further reducing the resistance generated by the friction part in this process; when the collision head slides toward the outside of the seat body under the impact of the door body, the expanded friction part will shrink radially inward during the sliding process along the side wall of the stroke cavity. At this time, the friction part cannot move quickly due to the physical obstacle in the direction of movement, and the force between the friction part and the side wall of the stroke cavity is also increasing, thereby increasing the friction resistance between the friction part and the side wall of the stroke cavity, effectively consuming the energy released by the damping part, greatly reducing the rebound speed of the door body, thereby avoiding the phenomenon of bouncing off.

[0010] In the above-mentioned bulletproof door collision, the friction piece is block-shaped and has a plurality of pieces, and the plurality of friction pieces are evenly distributed along the circumference of the collision head. By setting the friction piece to be block-shaped and having a plurality of pieces and evenly distributed along the circumference of the collision head, the plurality of friction pieces can ensure the concentricity of the collision head and the seat body, so that the collision head slides smoothly, and the size and number of the friction blocks are designed to facilitate the regulation of the resistance of the friction piece.

[0011] As another solution, the friction member is annular and sleeved on the periphery of the collision head, and a fracture is provided on the friction member. By setting the friction member to be annular and sleeved on the periphery of the collision head, and providing a fracture on the friction member, the friction member is similar to a piston ring, and the fracture design can ensure that the friction member itself can have a tendency to expand outward through elastic deformation, and the structure is simplified.

[0012] In the above-mentioned bulletproof door collision, the fracture is provided with a pre-compressed elastic member 1, and the two ends of the elastic member 1 are respectively against the two side walls of the fracture. By arranging the elastic member 1 in the fracture, the elastic member 1 can be a compression spring or a wave spring, etc., so that the two ends of the elastic member 1 can increase the tendency of the friction member to expand outward by abutting against the two side walls of the fracture, thereby ensuring the acting force between the friction member and the side wall of the stroke chamber.

[0013] As another solution, there are a plurality of friction members in an arc shape, and the plurality of friction members are sequentially arranged around the periphery of the collision head along the circumferential direction, and a pre-compressed elastic member 1 is provided between two adjacent friction members, and the two ends of the elastic member 1 are respectively against the two adjacent friction members. By providing a plurality of friction members in an arc shape, so that the plurality of friction members are sequentially arranged around the periphery of the collision head along the circumferential direction, and an elastic member 1 is provided between two adjacent friction members, the plurality of elastic members 1 can work together to eject the friction member radially outward, thereby ensuring the force between the friction member and the side wall of the stroke chamber.

[0014] In the above-mentioned bulletproof door collision, the friction member is a POM material member, a nylon material member, a metal member, a rubber member, or a plastic member. By setting the friction member to be a POM material member, a nylon material member, a metal member, a rubber member, or a plastic member, the wear resistance of the friction member can be improved while ensuring elastic expansion.

[0015] As another solution, the friction member is annular and sleeved on the periphery of the collision head, and the friction member is a soft elastic material member. By setting the friction member to be annular and sleeved on the periphery of the collision head and to be a soft elastic material member, the friction member can achieve an expansion effect through its own pre-compressed elastic deformation, thereby ensuring the effect of the friction member on the side wall of the stroke chamber.

[0016] In the above-mentioned anti-bullet door collision, a spring member capable of driving the friction member to expand outward is arranged between the friction member and the collision head. By arranging the spring member capable of driving the friction member to expand outward between the friction member and the collision head, the spring member can drive the friction member to deform and expand outward, thereby ensuring the effect of the friction member and the side wall of the stroke chamber.

[0017] In the above-mentioned bulletproof door collision, the outer peripheral surface of the collision head has a limiting ring groove extending in the circumferential direction, and the friction member is located in the limiting ring groove. Specifically, a limiting ring groove extending in the circumferential direction is provided on the collision head, so that the friction member is located in the limiting ring groove, so that the limiting ring groove can provide axial limitation for the friction member to ensure the effect of the friction member.

[0018] As another solution, the collision head has an annular ridge extending in the circumferential direction, and the friction member is axially limitedly sleeved on the annular ridge. By arranging an annular ridge extending in the circumferential direction on the collision head, the annular friction member limiting sleeve is arranged on the annular ridge, thus providing axial limitation for the friction member, thereby ensuring the effect of the friction member.

[0019] As another scheme, the outer peripheral surface of the collision head has a limiting ring groove extending in the circumferential direction, and the part of the collision head facing the limiting ring groove forms a limiting section. The limiting section is conical and the end close to the inner end of the collision head is the large end. The friction part is annularly sleeved on the periphery of the limiting section and the inner edge diameter of the friction part is smaller than the diameter of the large end of the limiting section. When the collision head slides outward relative to the seat body, the friction part can move to the large end of the limiting section and radially abut against the inner cavity side wall of the seat body. By providing a limiting ring groove extending circumferentially on the outer peripheral surface of the collision head, a conical limiting section is formed at the part opposite to the limiting ring groove, and the friction member is sleeved on the periphery of the limiting section and the inner edge diameter of the friction member is smaller than the diameter of the large end of the limiting section. In this way, when the collision head slides outwardly relative to the seat body, the friction member is driven by the friction of the side wall of the stroke cavity to move toward the large end of the limiting section. In this way, the inner edge of the friction member is supported by the large end of the limiting section to expand outwardly and thereby press more tightly against the side wall of the stroke cavity, thereby increasing the friction resistance of this process and the energy consumption of the damping member, and effectively avoiding the phenomenon of bouncing off. When the collision head slides inwardly relative to the seat body, the friction member is driven by the friction of the side wall of the stroke cavity to move toward the small end of the limiting section, and the inner edge of the friction member obtains sufficient collapse space, thereby ensuring that the acting force between the friction member and the side wall of the stroke cavity is within a smaller range, thereby ensuring the damping softness of this process.

[0020] In the above-mentioned bulletproof door collision, the outer periphery of the small end of the limiting section is also sleeved with a second elastic member, and the second elastic member always has a tendency to push the friction member to the large end of the limiting section along the axial direction. By sleeved with the second elastic member on the outer periphery of the small end of the limiting section, the second elastic member can ensure that when the collision head slides outward relative to the seat body, the inner edge of the friction member can be fully supported by the large end of the limiting section, thereby ensuring the friction effect.

[0021] In the above-mentioned bulletproof door collision, the inner side wall of the stroke cavity has a plurality of convex rings extending in the circumferential direction, and the plurality of convex rings are arranged at intervals along the axial direction of the seat body. By arranging a plurality of convex rings extending in the circumferential direction on the inner side wall of the stroke cavity, the convex rings can interact with the friction member to increase the friction resistance during the movement process, improve the energy absorption and speed reduction effect, and the processing of the convex rings is more convenient.

[0022] In the above-mentioned bulletproof door collision, several convex rings 1 smoothly transition along the axial direction of the seat body, the surface of the convex ring 1 is in the shape of an arc surface, and the outer edge surface of the friction member has a convex ring 2 that can adapt to the shape of the convex ring 1. By setting several convex rings 1 to smoothly transition along the axial direction of the seat body, and setting a convex ring 2 on the outer edge surface of the friction member to adapt to the shape of the convex ring 1, the friction area between the friction member and the convex ring 1 is increased, and the friction effect is improved. As another solution, the convex ring 1 has guiding bevels on both sides along the axial direction of the seat body, and the inclination of the guiding bevel of each convex ring 1 close to the bottom of the seat body is greater than the inclination of the guiding bevel close to the top of the seat body. By arranging guiding bevels on both sides of the convex ring 1 along the axial direction of the seat body, the inclination of the guiding bevels on each convex ring 1 close to the bottom of the seat body is greater than the inclination of the guiding bevels close to the top of the seat body. In this way, when the collision head slides outward relative to the seat body, the resistance of the friction part to the convex ring 1 is greater than the resistance of the friction part to the convex ring 1 when the collision head slides inward relative to the seat body, thereby further improving the energy absorption and speed reduction effect.

[0023] In the above-mentioned bulletproof door collision, the bottom of the seat body has a sunken groove connected to the stroke cavity, the bottom of the sunken groove has an annular step surface, a limit plate is sealed against the step surface, the limit plate has a through hole connecting the stroke cavity and the outside, and an annular pressure column for limiting the position of the limit plate is threaded in the sunken groove. By setting a sunken groove at the bottom of the seat body and sealing against the limit plate on the step surface at the bottom of the sunken groove, the limit plate can be a rubber material part to improve the sealing effect, and a through hole is set on the limit plate, so that the air in the stroke cavity can enter and exit the outside through the through hole, and the through hole can consume the impact energy through its own flow limiting effect.

[0024] In the above-mentioned bulletproof door collision, the annular pressure column is against the limiting plate, and the inner cavity of the annular pressure column is provided with a flow limiting plate that can cover the through hole, and the flow limiting plate has micro air holes that connect the outside and the through hole, and the outer diameter of the flow limiting plate is smaller than the inner diameter of the inner cavity of the annular pressure column, and the flow limiting plate can reciprocate between the annular pressure column and the limiting plate. By arranging a flow limiting plate with micro air holes between the annular pressure column and the limiting plate, the flow limiting plate is a metal part, a rubber part or a plastic part, so that the outer diameter of the flow limiting plate is smaller than the inner diameter of the sink, so that when the collision head slides toward the outside of the seat body, the negative pressure in the stroke cavity adsorbs the flow limiting plate on the edge of the through hole, so that the outside air can basically only enter from the micro air holes, thereby increasing the movement resistance of the collision head, and when the collision head slides toward the inside of the seat body, the flow limiting plate moves and opens the through hole so that the air in the stroke cavity can be discharged from the gap around the flow limiting plate, reducing the movement resistance of the collision head and ensuring the energy absorption effect.

[0025] As another solution, a current limiting plate covering the through hole is provided between the annular pressure column and the limiting plate, the current limiting plate is a soft material part and has micro air holes connecting the outside and the stroke cavity, the outer diameter of the current limiting plate is smaller than the inner diameter of the sink, and an annular clip spring is provided between the current limiting plate and the annular pressure column, and the clip spring has a yielding fracture. A current limiting plate with micro air holes is provided between the annular pressure column and the bottom surface of the sink, so that the outer diameter of the current limiting plate is smaller than the inner diameter of the sink, and the clip spring is provided to abut against the current limiting plate, so that when the collision head slides toward the outside of the seat body, the current limiting plate is pressed by the clip spring to the edge of the through hole, so that the outside air can basically only enter from the micro air holes, thereby increasing the movement resistance of the collision head, and when the collision head slides toward the seat body, the part of the current limiting plate facing the fracture of the clip spring can be pressed to the outer shape, thereby forming an exhaust gas passage to discharge the air in the stroke cavity, reducing the movement resistance of the collision head and ensuring the energy absorption effect.

[0026] As another solution, a flow limiting plate covering the through hole is provided between the annular pressure column and the limiting plate, the flow limiting plate is a soft material piece and has micro air holes connecting the outside and the stroke cavity, the outer diameter of the flow limiting plate is smaller than the inner diameter of the sink, a pressure ring is provided between the flow limiting plate and the annular pressure column, and the pressure ring has a plurality of claws arranged at intervals along the circumferential direction on the side facing the flow limiting plate. A flow limiting plate with micro air holes is provided between the annular pressure column and the bottom surface of the sink, so that the outer diameter of the flow limiting plate is smaller than the inner diameter of the sink, and the pressure ring is provided to abut against the flow limiting plate, so that when the collision head slides toward the outside of the seat body, the flow limiting plate is pressed by the pressure ring on the edge of the through hole, so that the outside air can basically only enter from the micro air holes, thereby increasing the movement resistance of the collision head, and when the collision head slides toward the seat body, the portion of the flow limiting plate that is opposite to the claw interval area on the pressure ring can be pressed to the outer shape, thereby forming an exhaust gas passage to discharge the air in the stroke cavity, reducing the movement resistance of the collision head and ensuring the energy absorption effect.

[0027] As another solution, the annular pressure column is against the limiting plate, and the inner cavity of the annular pressure column is provided with a flow limiting plate covering the through hole, and the flow limiting plate has a micro-pore connecting the outside and the stroke cavity, and the outer diameter of the flow limiting plate is smaller than the inner diameter of the inner cavity of the annular pressure column, and the bottom of the flow limiting plate is connected with an elastic member 3 that can press the flow limiting plate around the through hole. A flow limiting plate with micro-pores is provided between the annular pressure column and the bottom surface of the sink, so that the outer diameter of the flow limiting plate is smaller than the inner diameter of the sink, and an elastic member 3 is provided at the bottom of the flow limiting plate to press the flow limiting plate on the edge of the through hole, so that when the collision head slides toward the outside of the seat body, the outside air can basically only enter from the micro-pores, thereby increasing the movement resistance of the collision head, and when the collision head slides toward the inside of the seat body, the flow limiting plate is forced to drive the elastic member 3 to compress and open the shielded through hole, so that the air in the stroke cavity is discharged smoothly, reducing the movement resistance of the collision head and ensuring the energy absorption effect. Preferably, the elastic member three is a tower-shaped compression spring and the large end of the tower-shaped compression spring faces the current limiting plate to improve the compression effect.

[0028] In the above-mentioned bulletproof door collision, the side of the limiting plate facing the current limiting plate is embedded with an annular elastic sealing ring, the elastic sealing ring is arranged around the outer edge of the through hole, and the current limiting plate can be sealed against the elastic sealing ring. An elastic sealing ring is embedded on the limiting plate, and the elastic sealing ring is arranged around the periphery of the edge of the through hole, so that when the collision head moves outward and the current limiting plate is sucked onto the through hole, the current limiting plate can be sealed against the elastic sealing ring, so that the outside air can only enter through the micro-pores, and in this way, the current limiting plate can be made of a material with higher hardness, which is convenient for processing and cost control. As another solution, the inner side wall of the through hole is trumpet-shaped and the end close to the bottom of the seat body is the large end, the annular pressure column is against the limiting plate, and the inner cavity of the annular pressure column is provided with a plug that can block the through hole, the shape of the plug is adapted to the shape of the through hole, the plug has micro-pores connecting the outside world and the stroke cavity, and the bottom of the plug is connected to an elastic member three that can press the plug into the through hole. In this way, when the collision head slides toward the inside of the seat body, the plug is subjected to force to compress the elastic member three and open the blocked through hole, so that the air in the stroke cavity can be discharged smoothly, reducing the movement resistance of the collision head and ensuring the energy absorption effect. When the collision head slides toward the outside of the seat body, the plug remains in the through hole, controlling the air flow and ensuring the damping energy absorption effect.

[0029] In the above-mentioned bulletproof door collision, the inner cavity of the annular pressure column has a dust filter, and the dust filter is a filter screen, a sintered particle filter disc, a pressed filter disc, or a filter cloth. The dust filter can be a filter screen, a sintered particle filter disc, a pressed filter disc, or a filter cloth, so that dust and impurities can be filtered into the door collision when the door collision is working, avoiding the blockage of micro pores. Compared with the prior art, the advantages of the present invention are as follows:

[0030] The anti-bullet door collision is realized by arranging a friction member on the collision head which can move radially along the collision head. When the collision head slides toward the outside of the seat body, the friction member gradually adheres to the inner wall of the stroke cavity, that is, the friction resistance of the collision head in the rebound process is increased, and when the collision head slides into the seat body, the friction member gradually separates from the inner wall of the stroke cavity, that is, the friction resistance of the collision buffering process is controlled to be smaller and within an appropriate range. In this way, when the door body collides with the collision head and is attracted by the arranged magnet, the buffering damping of the door body is softer and the buffering stroke of the door body is extended, thereby fully absorbing the impact energy and avoiding the door body from bouncing off due to rigid collision. When the damping member starts to release the absorbed energy to push the collision head to drive the door body to start moving outward, the friction member can be rubbed against the side wall of the stroke cavity to gradually consume the energy released by the damping member, and the longer buffering stroke can fully ensure that the friction member can fully consume the energy released by the damping member, thereby controlling the speed at which the door body moves into place as the collision head rebounds within the restraining range of the magnetic attraction member, thereby effectively avoiding the door body from rebounding and breaking free. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment.

[0032] Figure 2 It is a schematic cross-sectional structure diagram of the first embodiment.

[0033] Figure 3 yes Figure 2 Enlarged view of part A in .

[0034] Figure 4 It is a schematic cross-sectional structure diagram of the second embodiment.

[0035] Figure 5 yes Figure 4 Enlarged view of part B in .

[0036] Figure 6 It is a schematic diagram of the three-dimensional structure of the friction member in the second embodiment.

[0037] Figure 7 It is a schematic diagram of the top view of the structure of the friction member and the elastic member 1 in the second embodiment.

[0038] Figure 8 It is a schematic cross-sectional structure diagram of the third embodiment.

[0039] Fig. 9 yes Figure 8 Enlarged view of section C in .

[0040] Fig.10 yes Figure 8 Enlarged view of part D in .

[0041] Fig.11 It is a schematic diagram of the three-dimensional structure of the friction member in the third embodiment.

[0042] Fig.12 It is a schematic diagram of the top view of the structure of the friction member and the elastic member 1 in the third embodiment.

[0043] Fig.13 It is a schematic cross-sectional structure diagram of the fourth embodiment.

[0044] Fig.14 yes Fig.13 Enlarged view of part E in .

[0045] Fig.15 yes Fig.13 Enlarged view of part F in .

[0046] Fig.16 It is a schematic cross-sectional structure diagram of the fifth embodiment.

[0047] Fig.17 yes Fig.16 Enlarged view of section G in .

[0048] Fig.18 yes Fig.16 Enlarged view of section H in .

[0049] In the figure, 1, seat body; 11, flared section; 12, sink; 121, step surface;

[0050] 2. collision head; 21. limiting ring groove; 22. limiting section; 23. annular convex ridge;

[0051] 3. Stroke chamber; 4. Damping element;

[0052] 5. Friction piece; 51. Fracture; 52. Convex ring 2

[0053] 6. Elastic part 1; 7. Spring part; 8. Elastic part 2;

[0054] 10. convex ring 1; 101. guide slope;

[0055] 110, limiting piece; 1101, through hole;

[0056] 120, annular pressure column; 1201, dust filter;

[0057] 130, current limiting plate; 1301, micro air hole;

[0058] 140, spring clip; 1401, break;

[0059] 150, pressure ring; 1501, claw;

[0060] 160. Elastic part three; 170. Plug; 180. Elastic sealing ring. DETAILED DESCRIPTION

[0061] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0062] like Figure 1-3As shown, the bulletproof door collision comprises a seat body 1 and a columnar collision head 2, the seat body 1 having a travel cavity 3, the inner end of the collision head 2 slidingly fits in the travel cavity 3, a damping member 4 is provided between the inner end of the collision head 2 and the seat body 1 to prevent the collision head 2 from sliding toward the seat body 1, a friction member 5 is provided on the collision head 2 which can move radially along the collision head 2, the friction member 5 can abut against the inner side wall of the travel cavity 3, damping oil or lubricating oil is coated between the friction member 5 and the inner side wall of the travel cavity 3, so that the door collision can work more stably, when the collision head 2 slides toward the outside of the seat body 1, the pressing force between the friction member 5 and the inner side wall of the travel cavity 3 gradually increases, and when the collision head 2 slides toward the inside of the seat body 1, the pressing force between the friction member 5 and the inner side wall of the travel cavity 3 gradually decreases. The seat body 1 is used to be fixed on the ground, wall or door body. The collision head 2 cooperates with the seat body 1 to slide axially within the range of the stroke cavity 3. The existing collision head 2 will be provided with magnetic suction parts such as magnets to cooperate with the matching suction seat. A damping member 4 is arranged between the inner end of the collision head 2 and the seat body 1. The damping member 4 can be a damping rod or a compression spring, etc., which can produce a buffering effect on the collision head 2. When the door body is impacted by the collision head 2 and attracted by the magnet, the buffering damping of the door body is relatively soft and the buffering stroke of the door body is extended, so as to fully absorb the impact energy and avoid the door body from bouncing off due to the rigid collision. When the damping member 4 starts to release the absorbed energy and pushes the collision head 2 to drive the door body to start moving outward, the friction member 5 can be rubbed against the side wall of the stroke cavity 3 and gradually consume the energy released by the damping member 4. The longer buffering stroke can fully ensure that the friction member 5 can fully consume the energy released by the damping member 4, so as to control the speed of the door body to move into position with the rebound of the collision head 2 within the restraining range of the magnetic attraction member, thereby effectively avoiding the door body from rebounding and breaking free. Furthermore, the inner wall of the stroke chamber 3 has a trumpet-shaped expansion section 11, and the end of the expansion section 11 close to the bottom of the seat body 1 is the large end. The friction member 5 always has a tendency to move radially outward along the collision head 2, and the friction member 5 abuts against the side wall of the stroke chamber 3.By setting the inner side wall of the stroke chamber 3 to be a trumpet shape with a small outside and a large inside, when the collision head 2 is impacted by the door body and slides toward the seat body 1, the side wall size of the flared section 11 that constrains the expansion of the friction member 5 will become larger and larger, and the rapid sliding process of the collision head 2 and the expansion process of the friction member 5 will be carried out simultaneously, and there is no physical obstacle on the route of the friction member 5, so that the friction member 5 can move to the bottom of the stroke chamber 3 before it fully abuts against the side wall of the stroke chamber 3, greatly reducing the friction resistance it generates, and the side wall of the stroke chamber 3 has a smooth inclined transition, which can provide sliding for the friction member 5. The guiding effect can further reduce the resistance generated by the friction member 5 in this process; when the collision head 2 is impacted by the door body and slides toward the outside of the seat body 1, the expanded friction member 5 will shrink radially inward in the process of sliding along the side wall of the stroke chamber 3. At this time, the friction member 5 cannot move quickly due to the physical obstruction of the movement direction, and the force between the friction member 5 and the side wall of the stroke chamber 3 is also increasing, so that the friction resistance between the friction member 5 and the side wall of the stroke chamber 3 is also increasing, effectively consuming the energy released by the damping member 4, greatly reducing the speed of the rebounding door body, thereby avoiding the phenomenon of bouncing off. The friction member 5 is block-shaped and has a plurality of them, and the plurality of friction members 5 are evenly distributed along the circumference of the collision head 2. By setting the friction member 5 to be block-shaped and having a plurality of them and evenly distributed along the circumference of the collision head 2, multiple friction members 5 can ensure the concentricity of the collision head 2 and the seat body 1, so that the collision head 2 slides smoothly, and the size and number of the friction blocks are designed to facilitate the regulation of the size of the resistance of the friction member 5.

[0063] like Figure 3 As shown, the bottom of the seat body 1 has a sink 12 connected to the stroke chamber 3, and the bottom of the sink 12 has an annular step surface 121, and a limit plate 110 is sealed and abutted on the step surface 121. The limit plate 110 has a through hole 1101 connecting the stroke chamber 3 and the outside world, and an annular pressure column 120 for limiting the position of the limit plate 110 is screwed in the sink 12. The annular pressure column 120 abuts against the limit plate 110, and the inner cavity of the annular pressure column 120 is provided with a flow limiting plate 130 that can cover the through hole 1101. The flow limiting plate 130 has a micro air hole 1301 connecting the outside world and the through hole 1101. The outer diameter of the flow limiting plate 130 is smaller than the inner diameter of the inner cavity of the annular pressure column 120, and the flow limiting plate 130 can reciprocate between the annular pressure column 120 and the limit plate 110. The inner side wall of the through hole 1101 is trumpet-shaped, and the end close to the bottom of the seat body 1 is the large end. The inner cavity of the annular pressure column 120 has a dust filter 1201, and the dust filter 1201 is a filter screen, a sintered particle filter disc, a pressed filter disc, or a filter cloth. Embodiment 2

[0064] like Figure 4-7As shown, this embodiment is basically the same as the first embodiment, except that: the friction member 5 is annular and sleeved on the periphery of the collision head 2, and a break 51 is provided on the friction member 5. By setting the friction member 5 to be annular and sleeved on the periphery of the collision head 2, and providing the break 51 on the friction member 5, the friction member 5 is similar to a piston ring. The design of the break 51 can ensure that the friction member 5 itself can have a tendency to expand outward through elastic deformation, and the structure is simplified. The outer peripheral surface of the collision head 2 has a limiting ring groove 21 extending in the circumferential direction, and the friction member 5 is located in the limiting ring groove 21. Specifically, a limiting ring groove 21 extending in the circumferential direction is provided on the collision head 2, so that the friction member 5 is located in the limiting ring groove 21, so that the limiting ring groove 21 can provide axial limit for the friction member 5, and ensure the effect of the friction member 5. As a preferred embodiment, the break 51 is provided with a pre-compressed elastic member 6, and the elastic member 6 can be a common compression spring or a wave spring, and the two ends of the elastic member 6 are respectively against the two side walls of the break 51. By arranging a compression spring 6 in the fracture 51, the two ends of the compression spring 6 can increase the tendency of the friction member 5 to expand outward by abutting against the two side walls of the fracture 51, thereby ensuring the force between the friction member 5 and the side wall of the stroke chamber 3. The friction member 5 is a POM material member, a nylon material member, a metal member, a rubber member, or a plastic member. By arranging the friction member 5 to be a POM material member, a nylon material member, a metal member, a rubber member, or a plastic member, the wear resistance of the friction member 5 can be improved while ensuring the elastic expansion of the friction member 5.

[0065] like Figure 4 , 5 As shown, a flow limiting plate 130 covering the through hole 1101 is provided between the annular pressure column 120 and the limiting plate 110. The flow limiting plate 130 is a soft material piece and has micro air holes 1301 connecting the outside and the stroke chamber 3. The outer diameter of the flow limiting plate 130 is smaller than the inner diameter of the sink 12. An annular retaining spring 140 is provided between the flow limiting plate 130 and the annular pressure column 120, and the retaining spring 140 has a yielding fracture 1401. Embodiment 3

[0066] like Figure 8-12As shown, this embodiment is basically the same as the second embodiment, except that: there are two friction members 5 in an arc shape, the two friction members 5 are sequentially arranged around the periphery of the collision head 2 along the circumferential direction, and a pre-compressed elastic member 6 is provided between two adjacent friction members 5, and the two ends of the elastic member 6 are respectively against the two adjacent friction members 5. By providing two friction members 5 in an arc shape, the two friction members 5 are sequentially arranged around the periphery of the collision head 2 along the circumferential direction, and an elastic member 6 is provided between two adjacent friction members 5, so that multiple elastic members 6 can work together to eject the friction member 5 radially outward, thereby ensuring the force between the friction member 5 and the side wall of the stroke chamber 3. The collision head 2 is provided with an annular convex ridge 23 extending in the circumferential direction, and the friction member 5 is axially limited on the annular convex ridge 23. By providing the annular convex ridge 23 extending in the circumferential direction on the collision head 2, the annular friction member 5 is limited on the annular convex ridge 23, thereby providing axial limitation for the friction member 5, thereby ensuring the effect of the friction member 5. The inner side wall of the stroke chamber 3 has a plurality of convex rings 10 extending in the circumferential direction, and the plurality of convex rings 10 are arranged at intervals along the axial direction of the seat body 1. The convex rings 10 have guiding inclined surfaces 101 on both sides along the axial direction of the seat body 1, and the inclination of the guiding inclined surface 101 near the bottom of the seat body 1 on each convex ring 10 is greater than the inclination of the guiding inclined surface 101 near the top of the seat body 1.

[0067] like Figure 8 , Fig.10 As shown, a flow limiting plate 130 covering the through hole 1101 is provided between the annular pressure column 120 and the limiting plate 110. The flow limiting plate 130 is a soft material piece and has micro air holes 1301 connecting the outside and the stroke chamber 3. The outer diameter of the flow limiting plate 130 is smaller than the inner diameter of the sink 12. A pressure ring 150 is provided between the flow limiting plate 130 and the annular pressure column 120. The pressure ring 150 has a plurality of claws 1501 arranged at intervals along the circumferential direction on the side facing the flow limiting plate 130. Embodiment 4

[0068] like Figure 13-15As shown, this embodiment is basically the same as the second embodiment, except that: the friction member 5 is annular and sleeved on the periphery of the collision head 2, the friction member 5 is a soft elastic material, and a spring member 7 capable of driving the friction member 5 to expand outward is provided between the friction member 5 and the collision head 2. By setting the friction member 5 to be annular and sleeved on the periphery of the collision head 2 and to be a soft material, and setting the spring member 7 capable of driving the friction member 5 to expand outward between the friction member 5 and the collision head 2, the spring member 7 can be a compression spring wound on the outer peripheral surface of the collision head 2 and abutting against the inner edge surface of the friction member 5, so that the spring member 7 can generate a force on the friction member 5 from the inner side of the friction member 5 in the radial direction to make it have an outward expansion trend. The inner side wall of the stroke chamber 3 has a plurality of convex rings 10 extending in the circumferential direction, and the plurality of convex rings 10 are arranged at intervals along the axial direction of the seat body 1. The plurality of convex rings 10 smoothly transition along the axial direction of the seat body 1 , the surface of the convex ring 10 is in an arc shape, and the outer edge surface of the friction member 5 has a convex ring 2 52 that can adapt to the shape of the convex ring 10 .

[0069] like Fig.13 , Fig.15 As shown, the annular pressure column 120 is against the limiting plate 110, and the inner cavity of the annular pressure column 120 is provided with a flow limiting plate 130 covering the through hole 1101. The flow limiting plate 130 has a micro air hole 1301 connecting the outside and the stroke cavity 3. The outer diameter of the flow limiting plate 130 is smaller than the inner diameter of the inner cavity of the annular pressure column 120. The bottom of the flow limiting plate 130 is connected to an elastic member 160 that can press the flow limiting plate 130 around the through hole 1101. An annular elastic sealing ring 180 is embedded on the side of the limiting plate 110 facing the flow limiting plate 130. The elastic sealing ring 180 is arranged around the outer edge of the through hole 1101, and the flow limiting plate 130 can be sealed against the elastic sealing ring 180. Embodiment 5

[0070] like Figure 16-18As shown, this embodiment is basically the same as the first embodiment, except that: the outer peripheral surface of the collision head 2 has a limiting ring groove 21 extending in the circumferential direction, the portion of the collision head 2 facing the limiting ring groove 21 forms a limiting section 22, the limiting section 22 is conical and the end close to the inner end of the collision head 2 is the large end, the friction member 5 is annularly sleeved on the periphery of the limiting section 22 and the inner edge diameter of the friction member 5 is smaller than the diameter of the large end of the limiting section 22, when the collision head 2 slides outward relative to the seat body 1, the friction member 5 can move to the large end of the limiting section 22 and abut against the inner cavity side wall of the seat body 1 in the radial direction. By providing a limiting ring groove 21 extending in the circumferential direction on the outer peripheral surface of the collision head 2, the portion of the collision head 2 that faces the limiting ring groove 21 forms a conical limiting section 22, and the friction member 5 is sleeved on the periphery of the limiting section 22 and the inner edge diameter of the friction member 5 is smaller than the diameter of the large end of the limiting section 22. In this way, when the collision head 2 slides outward relative to the seat body 1, the friction member 5 is driven by the friction of the side wall of the stroke chamber 3 to move toward the large end of the limiting section 22, so that the inner edge of the friction member 5 is driven by the large end of the limiting section 22. The top support will expand outwards and press more tightly against the side wall of the stroke chamber 3, increasing the friction resistance of this process and the energy consumption of the damping member 4, effectively avoiding the phenomenon of springing off; and when the collision head 2 slides inwards relative to the seat body 1, the friction member 5 is driven by the friction of the side wall of the stroke chamber 3 to move toward the small end of the limit section 22, and the inner edge of the friction member 5 obtains sufficient shrinkage space to ensure that the force between the friction member 5 and the side wall of the stroke chamber 3 is within a smaller range, ensuring the damping softness of this process. Further, the outer periphery of the small end of the limit section 22 is also sleeved with an elastic member 2 8, and the elastic member 2 8 always has the tendency to push the friction member 5 to the large end of the limit section 22 along the axial direction. By sleeved with the elastic member 2 8 on the outer periphery of the small end of the limit section 22, the elastic member 2 8 can ensure that the inner edge of the friction member 5 can be fully supported by the large end of the limit section 22 when the collision head 2 slides outwards relative to the seat body 1, thereby ensuring the friction effect.

[0071] like Fig.16 , Fig.18 As shown, the annular pressure column 120 is abutted against the limiting plate 110, and a plug 170 capable of blocking the through hole 1101 is provided in the inner cavity of the annular pressure column 120. The shape of the plug 170 is adapted to the shape of the through hole 1101, and the plug 170 is provided with micro air holes 1301 connecting the outside and the stroke cavity 3, and the bottom of the plug 170 is connected to an elastic member 160 capable of pressing the plug 170 into the through hole 1101.

[0072] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A bulletproof door collision device, comprising a seat body (1) and a collision head (2), wherein the seat body (1) has a travel cavity (3), the inner end of the collision head (2) is slidably fitted in the travel cavity (3), and a damping member (4) is provided between the inner end of the collision head (2) and the seat body (1), characterized in that: The collision head (2) is provided with a friction member (5) capable of abutting against the inner wall of the stroke chamber (3); when the collision head (2) slides toward the outside of the seat body (1), the pressing force of the friction member (5) on the inner wall of the stroke chamber (3) gradually increases; when the collision head (2) slides toward the inside of the seat body (1), the pressing force of the friction member (5) on the inner wall of the stroke chamber (3) gradually decreases; the inner wall of the stroke chamber (3) has a trumpet-shaped expansion section (11); the end of the expansion section (11) close to the bottom of the seat body (1) is the large end; the friction member (5) always has a tendency to move toward the inner wall of the stroke chamber (3) or always has a tendency to deform toward the inner wall of the stroke chamber (3); the friction member (5) abuts against the side wall of the expansion section (11).

2. The bulletproof door knocker according to claim 1, characterized in that: The friction piece (5) is block-shaped and has a plurality of pieces, and the plurality of friction pieces (5) are evenly distributed along the circumference of the collision head (2).

3. The bulletproof door knocker according to claim 1, characterized in that: The friction member (5) is annular and is sleeved on the periphery of the collision head (2). A fracture (51) is provided on the friction member (5).

4. The bulletproof door knocker according to claim 3, characterized in that: The fracture (51) is provided with a pre-compressed elastic member (6), and the two ends of the elastic member (6) are respectively pressed against the two side walls of the fracture (51).

5. The bulletproof door knocker according to claim 1, characterized in that: There are a plurality of friction members (5) in an arc shape. The plurality of friction members (5) are sequentially arranged around the periphery of the collision head (2) along the circumferential direction. A pre-compressed elastic member (6) is provided between two adjacent friction members (5). The two ends of the elastic member (6) are respectively pressed against the two adjacent friction members (5).

6. The bulletproof door knock-off device according to claim 1, 2, 3, 4 or 5, characterized in that: The friction part (5) is a POM material part, a nylon material part, a metal part, a rubber part, or a plastic part.

7. The bulletproof door knocker according to claim 1, characterized in that: The friction member (5) is annular and is sleeved on the periphery of the collision head (2); the friction member (5) is made of a soft elastic material.

8. The bulletproof door knock-off device according to claim 1 or 2 or 3 or 4 or 5 or 7, characterized in that: A spring member (7) capable of driving the friction member (5) to expand outward is provided between the friction member (5) and the collision head (2).

9. The bulletproof door knock-off device according to claim 3, 4, 5 or 7, characterized in that: The collision head (2) is provided with an annular convex ridge (23) extending in the circumferential direction, and the friction member (5) is sleeved on the annular convex ridge (23) in an axial limiting manner.

10. The bulletproof door knock-off device according to claim 1, 2, 3, 4 or 5, characterized in that: The inner side wall of the stroke chamber (3) has a plurality of convex rings (10) extending in the circumferential direction, and the plurality of convex rings (10) are arranged at intervals along the axial direction of the seat body (1).

11. A bulletproof door collision device, comprising a seat body (1) and a collision head (2), wherein the seat body (1) has a travel cavity (3), the inner end of the collision head (2) is slidably fitted in the travel cavity (3), and a damping member (4) is provided between the inner end of the collision head (2) and the seat body (1), characterized in that: The collision head (2) is provided with a friction member (5) capable of abutting against the inner wall of the stroke chamber (3); when the collision head (2) slides toward the outside of the seat body (1), the pressing force of the friction member (5) on the inner wall of the stroke chamber (3) gradually increases; when the collision head (2) slides toward the inside of the seat body (1), the pressing force of the friction member (5) on the inner wall of the stroke chamber (3) gradually decreases; the outer peripheral surface of the collision head (2) has a limiting ring groove (21) extending in the circumferential direction; the collision head (2) and the seat body (1) are connected to each other. The portion directly opposite to the limiting ring groove (21) forms a limiting section (22); the limiting section (22) is conical and the end close to the inner end of the collision head (2) is a large end; the friction member (5) is annularly sleeved on the periphery of the limiting section (22) and the inner edge diameter of the friction member (5) is smaller than the diameter of the large end of the limiting section (22); when the collision head (2) slides outward relative to the seat body (1), the friction member (5) can move to the large end of the limiting section (22) and abut against the side wall of the stroke chamber (3) in the radial direction.

12. The bulletproof door knocker according to claim 11, characterized in that: A second elastic member (8) is also sleeved on the periphery of the small end of the limiting section (22), and the second elastic member (8) always has the tendency to push the friction member (5) to the large end of the limiting section (22) along the axial direction.

13. The bulletproof door knocker according to claim 11, characterized in that: The inner side wall of the stroke chamber (3) has a plurality of convex rings (10) extending in the circumferential direction, and the plurality of convex rings (10) are arranged at intervals along the axial direction of the seat body (1).

14. The bulletproof door knocker according to claim 13, characterized in that: The plurality of convex rings (10) smoothly transition along the axial direction of the seat body (1), the surface of the convex ring (10) is in the shape of an arc surface, and the outer edge surface of the friction member (5) has a convex ring (52) that can match the shape of the convex ring (10).

15. The bulletproof door knocker according to claim 13, characterized in that: The convex ring 1 (10) has guiding inclined surfaces (101) on both sides along the axial direction of the seat body (1), and the inclination of the guiding inclined surfaces (101) on each convex ring 1 (10) close to the bottom of the seat body (1) is greater than the inclination of the guiding inclined surfaces (101) close to the top of the seat body (1).

16. The bulletproof door knocker according to claim 13, characterized in that: The bottom of the seat body (1) has a recessed groove (12) connected to the stroke chamber (3), the bottom of the recessed groove (12) has an annular step surface (121), a limit plate (110) is provided on the step surface (121) for sealing against the limit plate (110), the limit plate (110) has a through hole (1101) for connecting the stroke chamber (3) and the outside, and an annular pressure column (120) for limiting the position of the limit plate (110) is threadedly engaged in the recessed groove (12).

17. The bulletproof door knocker according to claim 16, characterized in that: The annular pressure column (120) is in contact with the limiting plate (110); the inner cavity of the annular pressure column (120) is provided with a flow limiting plate (130) capable of covering the through hole (1101); the flow limiting plate (130) has micro air holes (1301) communicating with the outside and the through hole (1101); the outer diameter of the flow limiting plate (130) is smaller than the inner diameter of the inner cavity of the annular pressure column (120); the flow limiting plate (130) can reciprocate between the annular pressure column (120) and the limiting plate (110).

18. The bulletproof door knocker according to claim 16, characterized in that: A flow limiting plate (130) covering the through hole (1101) is provided between the annular pressure column (120) and the limiting plate (110); the flow limiting plate (130) is a soft material piece and has micro air holes (1301) communicating with the outside and the stroke chamber (3); the outer diameter of the flow limiting plate (130) is smaller than the inner diameter of the sink (12); an annular retaining spring (140) is provided between the flow limiting plate (130) and the annular pressure column (120); the retaining spring (140) has a yielding fracture (1401).

19. The bulletproof door knocker according to claim 16, characterized in that: A flow limiting plate (130) covering the through hole (1101) is provided between the annular pressure column (120) and the limiting plate (110); the flow limiting plate (130) is a soft material piece and has micro air holes (1301) communicating with the outside and the stroke chamber (3); the outer diameter of the flow limiting plate (130) is smaller than the inner diameter of the sink (12); a pressure ring (150) is provided between the flow limiting plate (130) and the annular pressure column (120); and the pressure ring (150) has a plurality of claws (1501) arranged at intervals along the circumferential direction on the side facing the flow limiting plate (130).

20. The bulletproof door knocker according to claim 16, characterized in that: The annular pressure column (120) is in contact with the limiting plate (110), and a flow limiting plate (130) covering the through hole (1101) is provided in the inner cavity of the annular pressure column (120). The flow limiting plate (130) has micro air holes (1301) communicating with the outside and the stroke cavity (3). The outer diameter of the flow limiting plate (130) is smaller than the inner diameter of the inner cavity of the annular pressure column (120), and the bottom of the flow limiting plate (130) is connected to an elastic member (160) capable of pressing the flow limiting plate (130) around the through hole (1101).

21. The bulletproof door knocker according to claim 20, characterized in that: An annular elastic sealing ring (180) is embedded on the side of the limiting plate (110) facing the current limiting plate (130); the elastic sealing ring (180) is arranged around the outer edge of the through hole (1101); and the current limiting plate (130) can be sealed against the elastic sealing ring (180).

22. The bulletproof door knocker according to claim 16, characterized in that: The inner side wall of the through hole (1101) is trumpet-shaped and the end close to the bottom of the seat body (1) is the large end. The annular pressure column (120) is in contact with the limit plate (110). A plug (170) capable of blocking the through hole (1101) is provided in the inner cavity of the annular pressure column (120). The shape of the plug (170) is adapted to the shape of the through hole (1101). The plug (170) has a micro air hole (1301) connecting the outside and the stroke chamber (3). The bottom of the plug (170) is connected to an elastic member (160) capable of pressing the plug (170) into the through hole (1101).

23. The bulletproof door knocker according to claim 16, characterized in that: The inner cavity of the annular pressure column (120) has a dust filter (1201), and the dust filter (1201) is a filter screen, a sintered particle filter disc, a pressed filter disc, or a filter cloth.

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