Adaptive door pulley

Abstract

The present application discloses an adaptive door pulley, including a connecting component, a deformation component and a pulley component. The connecting component is suitable for docking with a door frame, and the pulley component is suitable for contacting the ground. The deformation component includes a first connecting arm and a second connecting arm. Both ends of the first connecting arm and the second connecting arm are rotatably connected to the connecting component and the pulley component respectively. The pulley assembly is suitable for moving away from the connecting component to one side. A buffer device is provided between the first connecting arm and the second connecting arm. The buffer device is suitable for moving the first connecting arm and the second connecting arm away from each other so that the pulley assembly is close to the central axis of the connecting component. The door pulley is compatible with existing diamond mesh sheets. The pulley assembly can move away from one side to avoid interference with existing column base plates and column anchor protective covers, and has a buffer function to adapt to different ground conditions and has good installation applicability.

Description

Technical Field

[0001] The present application relates to the technical field of pulleys, and in particular to an adaptive door pulley. Background Art

[0002] Safety fences are mainly used to limit and prevent activities within a specific range of a site, so as to achieve the purpose of eliminating and reducing safety hazards. Safety fences are divided into types such as fences, fences and warning tapes according to the different places of use. Fences generally include frames and isolation nets set between each frame. Fences are mainly used for temporary or short-term isolation. The main application places are the functional area division and isolation of processing workshops or the isolation of specific work areas, such as patios, etc., to play a protective and warning role, prevent people from accidentally entering the isolation area, and do not affect the operation flow of processing equipment.

[0003] In order to improve the stability of the door when opening and closing, it is usually necessary to install a door pulley at the bottom of the door to share the pressure of the hinge connecting the door and the frame, while improving the smoothness of the door opening and closing, making opening and closing the door easier and more labor-saving.

[0004] However, the existing door pulleys have the following defects: since there are often speed bumps or uneven ground caused by the passage of lines on the path of door opening, ordinary door pulleys cannot pass through different road conditions smoothly and are prone to obstruction, affecting the normal opening and closing of the door or even damaging it. The door pulleys on the market that can cope with different road conditions are usually in the form of straight up and down buffers, which are easy to interfere with the column bottom plate and column foot guard cover on the fence frame when the door is closed, making it difficult to meet the closing requirements of the door. Summary of the Invention

[0005] One object of the present application is to provide an adaptive door pulley that is not prone to interference and has a ground adaptive buffering function.

[0006] To achieve the above objectives, the technical solution adopted in the present application is: an adaptive door pulley, comprising a connecting assembly, a deformation assembly and a pulley assembly, the connecting assembly being suitable for docking with a door frame, the pulley assembly being suitable for contacting the ground, the deformation assembly comprising a first connecting arm and a second connecting arm, both ends of the first connecting arm and the second end of the connecting arm being rotatably connected to the connecting assembly and the pulley assembly respectively, the pulley assembly being suitable for moving away from the connecting assembly to one side, a buffer device being provided between the first connecting arm and the second connecting arm, the buffer device being suitable for moving the first connecting arm and the second connecting arm away from each other so that the pulley assembly is close to the central axis of the connecting assembly.

[0007] As an improvement, the buffer device includes a fixed end and a buffer end, the fixed end is fixedly connected to the first connecting arm, and the buffer end is movably connected to the second connecting arm. When the first connecting arm and the second connecting arm rotate, the buffer device is suitable for deforming with the movement of the buffer end at the second connecting arm and generating a force to resist the relative movement of the first connecting arm and the second connecting arm.

[0008] As an improvement, the buffer device includes a support column and an elastic member, the elastic member is arranged along the support column, the support column is fixedly connected to the first connecting arm, and a movable groove is provided on the second connecting arm. The support column is suitable for extending into the movable groove and sliding along the movable groove when the first connecting arm and the second connecting arm rotate, and the two ends of the elastic member respectively abut the first connecting arm and the second connecting arm.

[0009] As an improvement, the support column passes through the movable slot and is provided with an adjustment portion on the outside of the second connecting arm, the adjustment portion is suitable for limiting the maximum distance between the first connecting arm and the second connecting arm, and an adjuster is provided between the support column and the first connecting arm, the adjuster is suitable for changing the distance between the adjustment portion and the first connecting arm.

[0010] As an improvement, a contact gasket is provided between the buffer end and the second connecting arm, and the contact gasket is suitable for preventing the buffer end from directly contacting the second connecting arm during movement, and the contact gasket is suitable for allowing smooth relative movement between the buffer end and the second connecting arm.

[0011] As an improvement, the exterior of the contact gasket is covered with a friction-reducing layer, and the friction-reducing layer is suitable for ensuring that the friction coefficient between the contact gasket and the second connecting arm is no greater than 0.1.

[0012] As an improvement, the outside of the contact gasket is covered with a friction-reducing layer, and the outside of the second connecting arm is covered with a protective layer. The friction-reducing layer is suitable for making the friction coefficient between the contact gasket and the protective layer no greater than 0.5.

[0013] As an improvement, the first connecting arm and the second connecting arm are parallel to each other, and the buffer device is suitable for moving the first connecting arm and the second connecting arm away from each other so that the central axis of the connecting assembly and the central axis of the pulley assembly tend to be collinear.

[0014] As an improvement, the deformation assembly also includes a first connecting seat and a second connecting seat, the first connecting seat connects the connecting assembly, the first connecting arm and the second connecting arm, the second connecting seat connects the pulley assembly, the first connecting arm and the second connecting arm, the line between the connection points of the first connecting arm and the second connecting arm at the first connecting seat is parallel to the line between the connection points of the first connecting arm and the second connecting arm at the second connecting seat, and the angle between the line between the connection points of the first connecting arm and the second connecting arm at the first connecting seat and the central axis of the connecting assembly is α, 0°<α<90°.

[0015] As an improvement, the connecting assembly includes a fixed seat, which is provided with at least one detachable fixing pin, and at least one positioning pin is provided on the side of the fixed seat, and the positioning pin is suitable for adjusting the depth of the fixed seat; the pulley assembly is rotatably connected to the deformation assembly, and the rotation plane of the pulley assembly is perpendicular to the central axis of the fixed seat.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The door pulley has adaptive buffering capabilities and can smoothly cross uneven ground and obstacles on the ground while moving with the door body, thereby adapting to different ground conditions. It will not cause excessive impact on the door body during movement, and can achieve stable support and guidance for the door body. During installation and movement, the door pulley will not cause structural and movement interference with the existing fence column base plate and column anchor protective cover, and has better installation applicability.

[0018] 2. The door pulley has an adjustment space of 120mm to 200mm in height, which can limit the maximum downward stroke of the door pulley. It is used in special situations where the door body is light in weight and the structural strength is low, to avoid the impact on the door body caused by excessive elastic force after the door pulley is compressed, and has better installation applicability.

[0019] 3. The installation of this door pulley is compatible with the diamond mesh on the existing fence, and there is no need for secondary processing of the existing mesh products. At the same time, it is compatible with the installation of ground latch products to a certain extent. Compared with the traditional door pulley, the durability of this door pulley can be the same as or even exceed it, and the manufacturing cost can be controlled within twice that of the old door pulley. The processing technology is in line with the processing capacity of the existing workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereoscopic diagram of a preferred embodiment of the present application when deformed to a height of 160 mm.

[0021] Figure 2It is a right view of a preferred embodiment according to the present application.

[0022] Figure 3 According to a preferred embodiment of the present application Figure 2 Section view along AA direction.

[0023] Figure 4 It is a stereoscopic diagram of a preferred embodiment of the present application when deformed to a height of 140 mm.

[0024] Figure 5 It is a stereoscopic diagram of a preferred embodiment of the present application when deformed to a height of 120 mm.

[0025] Figure 6 It is a schematic diagram of the structure when the height is limited to 160 mm according to a preferred embodiment of the present application.

[0026] Figure 7 It is a schematic diagram of the structure when the height is limited to 140 mm according to a preferred embodiment of the present application.

[0027] Figure 8 It is a schematic diagram of the structure when the height is limited to 120 mm according to a preferred embodiment of the present application.

[0028] Figure 9 It is a structural diagram according to another preferred embodiment of the present application.

[0029] In the figure: 1. Connecting assembly; 11. Fixed seat; 12. Fixed pin; 13. Positioning pin; 2. Deformation assembly; 21. First connecting arm; 22. Second connecting arm; 221. Movable groove; 23. Receptacle; 24. First connecting seat; 25. Second connecting seat; 26. Groove; 3. Pulley assembly; 4. Buffer device; 41. Fixed end; 42. Buffer end; 43. Support column; 431. Adjustment part; 432. Regulator; 44. Elastic member; 45. Contact gasket. DETAILED DESCRIPTION

[0030] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating the orientation and position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0034] The present application will be further described below with reference to the accompanying drawings:

[0035] like Figures 1 to 9 As shown, a preferred embodiment of the present application includes a connecting component 1, a deformation component 2 and a pulley component 3, the connecting component 1 is suitable for docking with the door frame, the pulley component 3 is suitable for contacting the ground, the deformation component 2 includes a first connecting arm 21 and a second connecting arm 22, both ends of the first connecting arm 21 and the second connecting arm 22 are respectively rotatably connected to the connecting component 1 and the pulley component 3, the pulley assembly 3 is suitable for moving away from the connecting component 1 to one side, and a buffer device 4 is provided between the first connecting arm 21 and the second connecting arm 22, the buffer device 4 is suitable for making the first connecting arm 21 and the second connecting arm 22 move away from each other so that the pulley assembly 3 is close to the central axis of the connecting component 1, and the central axis of the connecting component 1 refers to the axis vertically passing through the center of the connecting component 1.

[0036] The connecting component 1 is fixedly connected to the door frame, and the deforming component 2 can enable the pulley component 3 to move relative to the connecting component 1. Therefore, when the pulley component 3 is impacted by the uneven ground and obstacles on the ground, it can move relative to the door body under the guidance of the deforming component 2, thereby realizing the adaptive adjustment movement between the pulley component 3 and the ground and obstacles on the ground during the door opening and closing process, and finally achieving a buffering effect, avoiding hard contact between the door body and the ground and obstacles on the ground, which may cause damage to the door body, thereby improving safety of use.

[0037] The buffer device 4 can keep the pulley assembly 3 in a stable initial state when it is not subjected to external force. When the pulley assembly 3 is separated from the initial state due to the action of external force, the buffer device 4 can make the pulley assembly 3 continuously and stably obtain the trend of changing to the initial state. When entering the state with this trend, the external force acting on the pulley assembly 3 can be dynamically balanced with the force generated by the trend, that is, the force applied by the buffer device 4, so that the deformation assembly 2 undergoes the deformation required to adapt to its external force balance. Finally, the buffer device 4 can cooperate with the deformation assembly 2 to form an overall dynamic deformation mechanism, so that the pulley assembly 3 is in adaptive contact with the ground, thereby obtaining support for the door body and a guiding effect when opening and closing the door.

[0038] The deformation component 2 can guide the pulley component 3 to deflect its movement trajectory toward one side of the pulley component 3. The pulley component 3 can move away from the connecting component 1 during the buffering activity. When the door body is closed, the pulley component 3 will not cause structural and movement interference with the column base plate and column anchor protective cover of the fence near the door body. When the door body is opened, it will not cause structural and movement interference with the above-mentioned mechanism, and has better installation applicability.

[0039] The buffer device 4 includes a fixed end 41 and a buffer end 42. The fixed end 41 is fixedly connected to the first connecting arm 21, and the buffer end 42 is movably connected to the second connecting arm 22. When the first connecting arm 21 and the second connecting arm 22 rotate, the buffer device 4 is suitable for deforming with the movement of the buffer end 42 at the second connecting arm 22 and generating a force to resist the relative movement of the first connecting arm 21 and the second connecting arm 22. The deformation form of the buffer device 4 is preferably compression deformation. This form of buffer device 4 can be arranged between the first connecting arm 21 and the second connecting arm 22 to complete the compression deformation process, making the overall structure more compact, reducing space occupancy, and avoiding structural interference.

[0040] Furthermore, the cross-section of the first connecting arm 21 and the second connecting arm 22 is a U-shaped structure, and a cavity 23 can be formed between the first connecting arm 21 and the second connecting arm 22. The buffer device 4 can be hidden in the cavity 23, ensuring the structural strength of the first connecting arm 21 and the second connecting arm 22 while making the overall structure more compact and improving space utilization.

[0041] The buffer device 4 includes a support column 43 and an elastic member 44. The elastic member 44 is arranged along the support column 43. The elastic member 44 preferably uses a circular coil spring or a rectangular coil spring. The support column 43 can guide and ensure the compression deformation of the elastic member 44. The support column 43 is fixed to the first connecting arm 21, and a movable groove 221 is provided on the second connecting arm 22. The two ends of the elastic member 44 respectively abut the first connecting arm 21 and the second connecting arm 22. The support column 43 is suitable for extending into the movable groove 221 and sliding along the movable groove 221 when the first connecting arm 21 and the second connecting arm 22 rotate. When the first connecting arm 21 and the second connecting arm 22 rotate with the pulley assembly 3, the support column 43 can adapt to the structural changes between the first connecting arm 21 and the second connecting arm 22 by moving at one end in the movable groove 221, thereby maintaining the guidance of the elastic member 44.

[0042] The cooperation between the support column 43 and the movable groove 221 can also enhance the structural strength of the first connecting arm 21 and the second connecting arm 22, and can prevent the first connecting arm 21 and the second connecting arm 22 from deflecting and moving to the left and right sides respectively when subjected to external force, thereby enhancing the operating stability of the first connecting arm 21 and the second connecting arm 22.

[0043] The maximum distance between the first connecting arm 21 and the second connecting arm 22 can be the maximum extension stroke of the elastic member 44. When the first connecting arm 21 and the second connecting arm 22 move away from each other to the maximum extension stroke of the elastic member 44, the pulley assembly 3 loses the force applied by the buffer device 4 and is in the initial state.

[0044] When the first connecting arm 21 and the second connecting arm 22 move away from each other to a distance exceeding the maximum extension stroke of the elastic member 44, the two ends of the elastic member 44 will be separated from the first connecting arm 21 and the second connecting arm 22, causing the pulley assembly 3 to lose its restriction and sag naturally, affecting the smoothness of the operation of the buffer device 4. Therefore, the support column 43 passes through the movable slot 221 and is provided with an adjustment portion 431 on the outer side of the second connecting arm 22. The adjustment portion 431 is suitable for limiting the maximum distance between the first connecting arm 21 and the second connecting arm 22. An adjuster 432 is provided between the support column 43 and the first connecting arm 21. The adjuster 432 is suitable for changing the distance between the adjustment portion 431 and the first connecting arm 21. The adjuster 432 preferably uses a nut, and the adjuster 432 is threadedly connected to the support column 43. The adjustment portion 431 can be locked at a position at different distances from the first connecting arm 21 through the adjuster 432. When the door body is light or the structural strength is low, the displacement stroke of the pulley assembly 3 can be prevented from being too large, thereby causing pressure and impact on the door body, causing deformation of the door body or affecting the smoothness of opening and closing of the door body.

[0045] In the door pulley, the adjustment portion 431 enables the pulley assembly 3 to have an adjustment space of 120 mm to 200 mm in height. Generally, it is only necessary to set the position of the adjustment portion 431 to slightly exceed the maximum extension stroke of the elastic member 44.

[0046] When the door body is folded, opened and folded, the movable height of the pulley assembly 3 can be limited and locked by operating the adjustment part 321 to avoid the tendency of the deformation assembly 2 to reset, prevent the door body from shaking and swaying, and improve the stability of the door body when folded, opened and folded.

[0047] When the door pulley is buffering, the first connecting arm 21 will be close to the second connecting arm 22. Since the length of the support column 43 is fixed, the adjustment part 431 will be relatively far away from the outside of the second connecting arm 22. The state that can be directly observed is that the support column 43 extends from the movable groove 221 of the second connecting arm 22. In order to avoid the support column 43 from interfering with the ground or obstacles after extending to the outside of the second connecting arm 22, the fixed end 41 is one end of the support column 43 and is fixedly connected to the first connecting arm 21. The buffering end 42 is one end of the elastic member 44 away from the first connecting arm 21 and in contact with the second connecting arm 22. The first connecting arm 21 is preferably located below the second connecting arm 22, which can effectively avoid the occurrence of the above-mentioned problems and obtain better installation applicability.

[0048] A contact gasket 45 is provided between the buffer end 42 and the second connecting arm 22. The contact gasket 45 is suitable for preventing the buffer end 42 from directly contacting the second connecting arm 22 during movement. Since the elastic member 44 generally uses a spring, the contact position with the second connecting arm 22 is not smooth. The contact gasket 45 can prevent the buffer end 42 from constantly rubbing against the second connecting arm 22 during the movement with the support column 43, causing wear on both and affecting the service life.

[0049] The contact gasket 45 is suitable for enabling smooth relative movement between the buffer end 42 and the second connecting arm 22, that is, obtaining a stable damping sliding effect. Since the surface of the buffer end 42 is uneven, if there is no buffer gasket, the buffer end 42 will move relative to the surface of the second connecting arm 22 as the support column 43 moves during the buffering process. There will be a more obvious jam in the relative movement, which is reflected in the movement of the pulley assembly 3 as a more obvious jump, affecting the stability and smoothness of the buffering, and will cause a certain impact and influence on the operation of the door body.

[0050] The outside of the contact gasket 45 is covered with a friction-reducing layer, which preferably uses a graphite coating to give the contact gasket 45 a self-lubricating effect. The friction-reducing layer is suitable for making the friction coefficient between the contact gasket 45 and the second connecting arm 22 no greater than 0.1. The friction-reducing layer can reduce the friction coefficient between the contact gasket 45 and the second connecting arm 22, avoid excessive friction between the contact gasket 45 and the second connecting arm 22, reduce the contact friction loss between the contact gasket 45 and the second connecting arm 22, and improve the service life.

[0051] The first connecting arm 21 and the second connecting arm 22 are parallel to each other, and the buffer device 4 is suitable for making the first connecting arm 21 and the second connecting arm 22 move away from each other so that the central axis of the connecting component 1 and the central axis of the pulley assembly 3 tend to be collinear. The first connecting arm 21 and the second connecting arm 22 cooperate to form a structure similar to a parallel link. During the buffering process, the central axis of the pulley assembly 3 and the central axis of the connecting component 1 can always remain parallel to avoid deflection of the pulley assembly 3, so that the pulley assembly 3 can contact the ground at a fixed angle. The pulley assembly 3 is rotatably connected to the deformation assembly 2, and the rotation plane of the pulley assembly 3 is perpendicular to the central axis of the fixed seat 11, thereby realizing universal movement of the pulley assembly 3 and improving the smoothness of movement of the pulley assembly 3.

[0052] The deformation assembly 2 also includes a first connecting seat 24 and a second connecting seat 25. The first connecting seat 24 connects the connecting assembly 1, the first connecting arm 21 and the second connecting arm 22. The second connecting seat 25 connects the pulley assembly 3, the first connecting arm 21 and the second connecting arm 22. The line between the connection points of the first connecting arm 21 and the second connecting arm 22 at the first connecting seat 24 is parallel to the line between the connection points of the first connecting arm 21 and the second connecting arm 22 at the second connecting seat 25. The angle between the line between the connection points of the first connecting arm 21 and the second connecting arm 22 at the first connecting seat 24 and the central axis of the connecting assembly 1 is α, 0°<α<90°, and the position of the line between the connection points of the first connecting arm 21 and the second connecting arm 22 at the first connecting seat 24 is fixed. Within this angle range, the deformation assembly 2 can perform more stable deformation and can keep the pulley assembly 3 away from the connecting assembly 1 at all times.

[0053] Grooves 26 are provided on both sides of the first connecting arm 21 and the second connecting arm 22. When the first connecting arm 21 and the second connecting arm 22 are close to each other, the connection point of the first connecting arm 21 at the second connecting seat 25 can be embedded in the groove 26 at the second connecting arm 22, and the connection point of the second connecting arm 22 at the first connecting seat 24 can be embedded in the groove 26 at the first connecting arm 21, so that the two can overlap with each other when they are too close, thereby ensuring the installation space of the buffer device 4 while further improving the compactness of the structure.

[0054] The connecting assembly 1 includes a fixing seat 11, and the frame of the door body can be snapped into the fixing seat 11. At least one detachable fixing pin 12 is provided on the fixing seat 11, and at least one positioning pin 13 is provided on the side of the fixing seat 11. The positioning pin 13 is suitable for adjusting the depth of extending into the fixing seat 11.

[0055] The number of fixing pins 12 is preferably two, and the fixing pins 12 can be connected and fixed using bolts and nuts. The fixing pins 12 can be inserted into the diamond mesh to fix the frame of the door body, thereby achieving compatible installation of the diamond mesh and improving installation applicability.

[0056] The number of the positioning pins 13 is preferably two. The positioning pins 13 can contact the frame of the door body, fix the frame of the door body in the fixing seat 11, prevent it from shaking in the fixing seat 11, and improve the connection stability of the connecting component 1.

[0057] In another preferred embodiment of the present application, the outside of the contact gasket 45 is covered with a wear-reducing layer, and the outside of the second connecting arm 22 is covered with a protective layer. The protective layer is preferably a spray-coated layer, which has good corrosion resistance and wear resistance. The wear-reducing layer is suitable for making the friction coefficient between the contact gasket 45 and the protective layer not greater than 0.5, reducing the wear between the contact gasket 45 and the protective layer, and avoiding rapid wear of the protective layer affecting the service life of the second connecting arm 22.

[0058] like Figure 9 As shown, the contact gasket 45 of another preferred embodiment of the present application extends into the movable groove 221 and covers the four sides of the support column 43, which can prevent the four sides of the support column 43 from contacting and rubbing with the second connecting arm 22 during the movement, thereby improving the service life of the support column 43.

[0059] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. An adaptive door pulley, characterized by: The invention comprises a connecting assembly, a deforming assembly and a pulley assembly, wherein the connecting assembly is suitable for docking with a door frame, the pulley assembly is suitable for contacting the ground, the deforming assembly comprises a first connecting arm and a second connecting arm, both ends of the first connecting arm and the second connecting arm are respectively rotatably connected to the connecting assembly and the pulley assembly, the pulley assembly is suitable for moving away from the connecting assembly to one side, a buffer device is provided between the first connecting arm and the second connecting arm, the buffer device is suitable for moving the first connecting arm and the second connecting arm away from each other so that the pulley assembly approaches the central axis of the connecting assembly; The buffer device includes a fixed end and a buffer end, the fixed end is fixedly connected to the first connecting arm, and the buffer end is movably connected to the second connecting arm. When the first connecting arm and the second connecting arm rotate, the buffer device is adapted to deform along with the movement of the buffer end at the second connecting arm and generate a force to resist the relative movement of the first connecting arm and the second connecting arm; The buffer device includes a support column and an elastic member, wherein the elastic member is arranged along the support column, the support column is fixedly connected to the first connecting arm, and a movable groove is formed on the second connecting arm. The support column is adapted to extend into the movable groove and slide along the movable groove when the first connecting arm and the second connecting arm rotate, and the two ends of the elastic member respectively abut against the first connecting arm and the second connecting arm; The first connecting arm and the second connecting arm are parallel to each other, and the buffer device is adapted to move the first connecting arm and the second connecting arm away from each other so that the central axis of the connecting assembly and the central axis of the pulley assembly tend to be collinear; The deformation assembly also includes a first connecting seat and a second connecting seat, the first connecting seat connects the connecting assembly, the first connecting arm and the second connecting arm, the second connecting seat connects the pulley assembly, the first connecting arm and the second connecting arm, the line between the connection points of the first connecting arm and the second connecting arm at the first connecting seat is parallel to the line between the connection points of the first connecting arm and the second connecting arm at the second connecting seat, and the angle between the line between the connection points of the first connecting arm and the second connecting arm at the first connecting seat and the central axis of the connecting assembly is α, 0°<α<90°.

2. The adaptive door pulley according to claim 1, characterized in that: The support column passes through the movable slot and is provided with an adjustment portion on the outer side of the second connecting arm. The adjustment portion is suitable for limiting the maximum distance between the first connecting arm and the second connecting arm. An adjuster is provided between the support column and the first connecting arm. The adjuster is suitable for changing the distance between the adjustment portion and the first connecting arm.

3. The adaptive door pulley according to claim 1, characterized in that: A contact gasket is provided between the buffer end and the second connecting arm, and the contact gasket is suitable for preventing the buffer end from directly contacting the second connecting arm during movement, and the contact gasket is suitable for allowing the buffer end and the second connecting arm to move smoothly relative to each other.

4. The adaptive door pulley according to claim 3, characterized in that: The exterior of the contact gasket is covered with a friction-reducing layer, and the friction-reducing layer is suitable for ensuring that the friction coefficient between the contact gasket and the second connecting arm is no greater than 0.

1.

5. The adaptive door pulley according to claim 3, characterized in that: The outside of the contact gasket is covered with a friction-reducing layer, and the outside of the second connecting arm is covered with a protective layer. The friction-reducing layer is suitable for making the friction coefficient between the contact gasket and the protective layer no greater than 0.

5.

6. The adaptive door pulley according to claim 1, characterized in that: The connecting assembly includes a fixing seat, on which at least one detachable fixing pin is provided, and at least one positioning pin is provided on the side of the fixing seat, and the positioning pin is suitable for adjusting the depth of the fixing seat; the pulley assembly is rotatably connected to the deformation assembly, and the rotation plane of the pulley assembly is perpendicular to the central axis of the fixing seat.

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