Highly adaptive intermediate pulley assembly and push-pull device

Abstract

The present invention belongs to the technical field of push-pull control, and discloses a highly adaptive intermediate pulley assembly and a push-pull device, wherein the highly adaptive intermediate pulley assembly comprises a bracket, a pulley assembly, a connecting rod assembly and an elastic member for supporting a push-pull body, wherein the length direction of the bracket is the first direction, the width direction is the second direction, and the bracket is provided with a first rotating shaft and a second rotating shaft which are parallel to each other at intervals along the first direction, and the first rotating shaft is slidably connected to the bracket along the first direction; the pulley assembly is provided with a third rotating shaft along the second direction; the connecting rod assembly connects the first rotating shaft, the second rotating shaft and the third rotating shaft; the elastic member is provided on the bracket along the first direction, and the free end of the elastic member is connected to the first rotating shaft. The present invention relies on the elastic force of the elastic member to enable the pulley assembly to perform adaptive support height adjustment, thereby ensuring that the load-bearing capacity of the intermediate pulley assembly is adjustable, and avoiding the problem that the intermediate pulley assembly is easily damaged by overload.

Description

Technical Field

[0001] The invention relates to the technical field of push-pull control, and in particular to a highly adaptive intermediate pulley assembly and a push-pull device. Background Art

[0002] The design of sliding door or sliding window structure is widely used because it can be opened and closed in one plane, takes up less space, and is easy to install screens. The development trend of sliding door or sliding window is that with the increasing demand for wide field of view, high lighting rate, beautiful appearance and increased indoor lighting, the sliding body has the characteristics of large span, but the weight of the sliding body is large.

[0003] In order to facilitate the smooth push-pull control of the push-pull body, in the prior art, a pulley assembly is arranged at the bottom of the push-pull body so that the weight of the push-pull body is carried on the pulley assembly, thereby improving the guiding property of the push-pull body and reducing the push-pull resistance, and the height of the push-pull body can be adjusted within a certain range. In order to facilitate the adjustment of the height, the pulley assembly is usually installed at both ends of the push-pull body along the push-pull direction. When the size of the push-pull body along the push-pull direction is large, the span and load-bearing capacity of the pulley assemblies at both ends will also increase accordingly, which will cause the middle section of the push-pull body to sag and affect the aesthetics. The push-pull resistance will increase with the increase of the drooping distance, resulting in unsmooth push-pull. In more serious cases, the pulley assembly itself will reach its load-bearing limit, greatly reducing the life of the pulley.

[0004] To solve these problems, it is necessary to add an intermediate pulley assembly in the middle of the bottom pulley assembly of the large-sized push-pull body. At the same time, in order to make the load-bearing capacity of each set of pulleys the same, the distance from the fan profile to the frame profile of each set of pulleys is required to be the same. The existing technology uses pulley assemblies with non-adjustable height. The problem is that the intermediate pulley assembly either fails to provide support or is easily damaged due to excessive load-bearing. Therefore, the problem of how to coordinate the load-bearing capacity of the intermediate pulley assembly with the pulley assemblies at both ends needs to be solved urgently. Summary of the invention

[0005] The first object of the present invention is to provide a highly adaptive intermediate pulley assembly to solve the problem that the intermediate pulley assembly located in the middle of the push-pull body cannot provide support or is easily damaged due to excessive load.

[0006] The second object of the present invention is to provide a push-pull device to solve the problem that the intermediate pulley assembly at the bottom of the push-pull device is easily damaged by overload.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Highly adaptable intermediate pulley assembly, including:

[0009] A bracket for supporting the push-pull body, with the length direction of the bracket as the first direction and the width direction of the bracket as the second direction, a first rotating shaft and a second rotating shaft parallel to each other are arranged on the bracket at intervals along the first direction, and the first rotating shaft is slidably connected to the bracket along the first direction;

[0010] A pulley assembly, wherein a third rotating shaft is provided on the pulley assembly along the second direction;

[0011] A connecting rod assembly, wherein the connecting rod assembly connects the first rotating shaft, the second rotating shaft and the third rotating shaft;

[0012] an elastic member, wherein the elastic member is arranged on the bracket along the first direction, and a free end of the elastic member is connected to the first rotating shaft;

[0013] When the load-bearing capacity of the bracket changes, the connecting rod assembly drives the third rotating shaft to stretch or compress the elastic member to achieve height self-adaptation of the bracket.

[0014] Optionally, the connecting rod assembly comprises:

[0015] A first connecting rod, two ends of which are pivotally connected to the second rotating shaft and the third rotating shaft respectively;

[0016] A second connecting rod, two ends of which are pivotally connected to the third rotating shaft and the first rotating shaft respectively.

[0017] Optionally, the highly adaptive intermediate pulley assembly further comprises a stopper, wherein the stopper is sleeved on the first rotating shaft, and the side of the stopper facing the elastic member has a force-bearing plane, and the force-bearing plane abuts against the free end of the elastic member.

[0018] Optionally, the bracket is a U-shaped structure with an opening downward, and the bracket includes a top plate and two side plates, the top plate is used to connect the push-pull body, and the side plates are provided with a long slot hole and a round hole along the first direction, the first rotating shaft is passed through the long slot hole, and the second rotating shaft is passed through the round hole.

[0019] Optionally, two of the first connecting rods and two of the second connecting rods are provided, and the two first connecting rods and the two second connecting rods are respectively provided on both sides of the pulley assembly.

[0020] Optionally, the highly adaptive intermediate pulley assembly further comprises a fixing member, which is detachably disposed at one end of the bracket, and the fixed end of the elastic member is fixed to the bracket via the fixing member.

[0021] Optionally, the highly adaptive intermediate pulley assembly further includes a washer, a plurality of the washers are provided, and the washer is sleeved on the first rotating shaft, and / or sleeved on the second rotating shaft, and / or sleeved on the third rotating shaft.

[0022] Optionally, when there is a maximum height difference between the pulley assembly and the bracket, the first rotating shaft is located at an end of the long slot hole close to the second rotating shaft, and when there is a minimum height difference between the pulley and the bracket, the first rotating shaft slides to an end of the long slot hole away from the second rotating shaft.

[0023] Optionally, the elastic force F0 of the elastic member satisfies:

[0024]

[0025] In the formula, G is the load-bearing capacity of the pulley assembly, A is the angle between the second connecting rod and the horizontal plane, and B is the angle between the first connecting rod and the vertical direction.

[0026] A push-pull device comprises a push-pull body, an end pulley assembly and the highly adaptive middle pulley assembly provided by the present invention. The highly adaptive middle pulley assembly is arranged between two end pulley assemblies and is detachably connected to the push-pull body.

[0027] Beneficial effects of the present invention:

[0028] The highly adaptive intermediate pulley assembly of the present invention realizes an adjustable height difference between the pulley assembly and the bracket through a connecting rod assembly. At the same time, the load-bearing load of the bracket and the pulley assembly is transmitted to the elastic member through the connecting rod assembly, and the adaptive height adjustment of the pulley assembly is realized by relying on the elastic force of the elastic member, thereby ensuring that the load-bearing load of the intermediate pulley assembly is adjustable and avoiding the problem of the intermediate pulley assembly being easily damaged by overload.

[0029] The push-pull device of the present invention arranges a highly adaptive intermediate pulley assembly in the middle of the push-pull body. When the load at the middle position of the push-pull body changes, the highly adaptive intermediate pulley assembly can adaptively adjust the bracket height and transmit it to the elastic support of the elastic member. The elastic member can output a stable load, so that the multi-point support of the push-pull body is evenly stressed, thereby ensuring the service life and sliding smoothness of the highly adaptive intermediate pulley assembly. The structure is simple, the function is reliable, and the cost performance is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a push-pull device of the present invention;

[0031] Figure 2 It is an exploded view of the assembly of a highly adaptive intermediate pulley assembly of the present invention;

[0032] Figure 3 is a schematic diagram of a first state of a highly adaptive intermediate pulley assembly of the present invention;

[0033] Figure 4 is a schematic diagram of a second state of a highly adaptive intermediate pulley assembly of the present invention;

[0034] Figure 5 It is a schematic diagram of force analysis of an elastic member in a highly adaptive intermediate pulley assembly of the present invention.

[0035] In the figure:

[0036] 100, push-pull body; 200, end pulley assembly; 300, middle pulley assembly;

[0037] 1. Bracket; 11. First rotating shaft; 12. Second rotating shaft; 13. Top plate; 14. Side plate; 15. Long slot hole; 16. Round hole;

[0038] 2. Pulley assembly; 21. third rotating shaft; 22. fixed plate; 23. pulley; 24. fourth rotating shaft;

[0039] 3. Connecting rod assembly; 31. First connecting rod; 32. Second connecting rod; 4. Elastic member; 5. Stopper; 6. Fixing member; 7. Washer. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] like Figure 1 The figure shows a push-pull device, including a push-pull body 100, an end pulley assembly 200 and an intermediate pulley assembly 300. Two end pulley assemblies 200 are provided, respectively located at the two ends of the push-pull body 100 along the push-pull direction. Due to the installation position, the intermediate pulley assembly 300 is difficult to adjust in height during use, so it is easy to cause the intermediate pulley assembly 300 to be overloaded and damaged, shortening its service life, or failing to fully support, which is useless. In order to improve the problems of the existing push-pull device's unsmooth push-pull and short service life, the present invention provides a highly adaptive intermediate pulley assembly, which is used to replace the intermediate pulley assembly 300 of the existing push-pull device, and is arranged in the middle of the bottom of the push-pull body 100, between the two end pulley assemblies 200 and detachably connected to the push-pull body 100. The middle of the bottom here does not specifically refer to the middle position of the push-pull body 100, and can be any position between the two end pulley assemblies 200, preferably the middle position. More than one highly adaptive middle pulley assembly can be provided at the bottom of the push-pull body 100 , and the highly adaptive middle pulley assembly and the two end pulley assemblies 200 have the same load-bearing capacity, thereby ensuring the service life and sliding smoothness of the highly adaptive middle pulley assembly and the two end pulley assemblies 200 .

[0045] like Figure 2-Figure 4As shown, the present invention provides a highly adaptive intermediate pulley assembly, including a bracket 1, a pulley assembly 2, a connecting rod assembly 3 and an elastic member 4. The top of the bracket 1 is used to support a push-pull body 100, with the length direction of the bracket 1 as the first direction, and the width direction of the bracket 1 as the second direction. The bracket 1 is provided with a first rotating shaft 11 and a second rotating shaft 12 parallel to each other at intervals along the first direction, and the first rotating shaft 11 and the second rotating shaft 12 are both provided along the second direction, and the first rotating shaft 11 is slidably connected to the bracket 1 along the first direction; the pulley assembly 2 is provided with a third rotating shaft 21 along the second direction; the third rotating shaft 21 is parallel to the first rotating shaft 11; the connecting rod assembly 3 connects the first rotating shaft 11, the second rotating shaft 12 and the third rotating shaft 21; the elastic member 4 is provided on the bracket 1 along the first direction, and the free end of the elastic member 4 is connected to the first rotating shaft 11; when the load-bearing load of the bracket 1 changes, the connecting rod assembly 3 drives the third rotating shaft 21 to stretch or compress the elastic member 4 to achieve the high adaptability of the bracket 1.

[0046] It is understandable that the push-pull body 100 may sag in the middle part and the center of gravity may drop after a long time, which will increase the load of the intermediate pulley assembly 300 and increase the sliding resistance of the intermediate pulley assembly 300. In order to achieve the height adjustment and self-adaptation of the intermediate pulley assembly 300, the highly adaptive intermediate pulley assembly provided by the present invention pivots the first rotating shaft 11, the second rotating shaft 12 and the third rotating shaft 21 through the connecting rod assembly 3, and transfers the load of the bracket 1 on the pulley assembly 2 to the elastic member 4. Through the elastic force of the elastic member 4, the load on the pulley assembly 2 is partially unloaded, thereby avoiding the problem that the pulley assembly 2 is overloaded and affects the service life or is even easily damaged.

[0047] Optionally, the connecting rod assembly 3 includes a first connecting rod 31 and a second connecting rod 32 , wherein two ends of the first connecting rod 31 are pivotally connected to the second rotating shaft 12 and the third rotating shaft 21 respectively; and two ends of the second connecting rod 32 are pivotally connected to the third rotating shaft 21 and the first rotating shaft 11 respectively.

[0048] A highly adaptive intermediate pulley assembly according to an embodiment of the present invention, such as Figure 1As shown, the pulley assembly 2 includes a fixed plate 22, a pulley 23 and a fourth rotating shaft 24, the two pulleys 23 are arranged along the first direction, and the fourth rotating shaft 24 passes through the fixed plate 22 and the pulley 23 in sequence to realize the rotation connection of the pulley 23. The third rotating shaft 21 passes through the fixed plate 22 and is located in the middle of the two pulleys 23, and the height difference between the pulley assembly 2 and the bracket 1 is adjustable through the connecting rod assembly 3. The two ends of the first connecting rod 31 are rotationally connected to the second rotating shaft 12 and the third rotating shaft 21 on the pulley assembly 2, and the second connecting rod 32 is rotationally connected to the third rotating shaft 21 on the pulley assembly 2 and the first rotating shaft 11, so that the load-bearing load of the bracket 1 and the pulley assembly 2 is transmitted to the elastic member 4 through the first connecting rod 31 and the second connecting rod 32, and the self-adaptive height adjustment of the pulley assembly 2 is realized by relying on the elastic force of the elastic member 4, thereby ensuring that the load-bearing load of the highly adaptive intermediate pulley assembly is adjustable, and avoiding the problem that the highly adaptive intermediate pulley assembly is easily damaged by overload.

[0049] Optionally, the highly adaptive intermediate pulley assembly further includes a stopper 5 , which is sleeved on the first rotating shaft 11 , and has a force-bearing plane on one side of the stopper 5 facing the elastic member 4 , and the force-bearing plane abuts against the free end of the elastic member 4 .

[0050] like Figure 2 As shown, the stopper 5 is cylindrical, and a force-bearing plane is provided on the outer circumference for contacting with the free end of the elastic member 4 to drive the contact, so as to change the length of the elastic member 4. The stopper 5 is sleeved on the first rotating shaft 11 and can rotate relative to the first rotating shaft 11. When the first rotating shaft 11 rotates and slides, the force-bearing plane of the stopper 5 can always abut against the free end of the elastic member 4. When the elastic member 4 is a spring, the length of the stopper 5 in the second direction is not less than the end face diameter of the elastic member 4. Preferably, the end face of the free end of the elastic member 4 can be connected and fixed with the force-bearing plane of the stopper 5, so as to keep the position of the free end of the elastic member 4 stable. The outer circumferential wall of the stopper 5 is a cam structure, so as to have a force-bearing plane of larger size.

[0051] Optionally, the bracket 1 is a U-shaped structure with an opening facing downward, and the bracket 1 includes a top plate 13 and two side plates 14. The top plate 13 is used to connect the push-pull body 100. The side plates 14 are provided with a long slot hole 15 and a round hole 16 along a first direction. The first rotating shaft 11 is passed through the long slot hole 15, and the second rotating shaft 12 is passed through the round hole 16.

[0052] like Figure 2As shown, the top plate 13 of the bracket 1 is used to support and connect the push-pull body 100. The top plate 13 is connected to the push-pull body 100 by screws, which is convenient for disassembly, assembly and replacement. Long slot holes 15 and round holes 16 are provided at corresponding positions on the side plates 14 on both sides, which are used to carry the two ends of the first rotating shaft 11 and the two ends of the second rotating shaft 12 respectively. In the preferred embodiment, the second rotating shaft 12 and the round hole 16 can be fixedly connected, or a bearing can be provided to realize a rotational connection. The top end of the first connecting rod 31 is passed through the second rotating shaft 12 to realize a pivot connection. The two ends of the first rotating shaft 11 are supported in the long slot hole 15 and can slide along the long slot hole 15 in the first direction. During the sliding process, the length of the elastic member 4 is changed to change the size of the elastic force. The bracket 1 with a U-shaped structure is convenient for positioning, installation and processing.

[0053] Optionally, two first connecting rods 31 and two second connecting rods 32 are provided respectively, and the two first connecting rods 31 and the two second connecting rods 32 are respectively provided on both sides of the pulley assembly 2 .

[0054] like Figure 2 and Figure 3 In this embodiment, the pulley assembly 2 includes two fixed plates 22 and two pulleys 23. The two fixed plates 22 sandwich the two ends of the two pulleys 23. The fourth rotating shaft 24 penetrates the pulleys 23 and the fixed plates 22 respectively to realize the rotational connection of the pulleys 23 between the two fixed plates 22. The bottom ends of the two first connecting rods 31 penetrate the two ends of the third rotating shaft 21 and abut against the outer side surface of the pulley assembly 2 respectively, so as to realize the rotational connection of the first connecting rods 31 and fix the spacing between the two first connecting rods 31. The bottom ends of the two second connecting rods 32 penetrate the two ends of the third rotating shaft 21 and abut against the outer side surfaces of the two first connecting rods 31 on both sides, so as to fix the spacing between the two second connecting rods 32 and realize the rotational connection of the second connecting rods 32. In this way, the second connecting rod 32 and the first connecting rod 31 limit the pulley assembly 2 between the two side plates 14, have a good linear guiding effect, and are conducive to the two pulleys 23 to roll along the push-pull direction.

[0055] Optionally, the highly adaptive intermediate pulley assembly further includes a fixing member 6 , which is detachably disposed at one end of the bracket 1 , and a fixed end of the elastic member 4 is fixed to the bracket 1 via the fixing member 6 .

[0056] like Figure 1As shown, the fixing member 6 is disposed between the two side plates 14 and connected to the two side plates 14. The fixing member 6 is located on the side of the long slot hole 15 away from the circular hole 16, and can limit the elastic member 4 in the space between the fixing member 6 and the long slot hole 15. The fixing member 6 is provided with a mounting hole at one end facing the elastic member 4, and the fixed end of the elastic member 4 is passed through the mounting hole and fixed. While the fixing member 6 fixes the fixed end of the elastic member 4, it can ensure the horizontal position of the elastic member 4 and ensure that the length change direction of the elastic member 4 is in the horizontal direction. Of course, in some embodiments, a support structure can be provided below the elastic member 4, and both sides of the support structure are slidably connected to the two side plates 14, that is, the self-weight support of the elastic member 4 can be realized, and the support structure can be extended and retracted as the length of the elastic member 4 changes to realize follow-up support, without affecting the length change and elastic force of the elastic member 4.

[0057] Optionally, the fixing member 6 is snap-fitted with the two side panels 14. Specifically, one of the two sides of the fixing member 6 and the two side panels 14 is provided with a hook, and the other is provided with a slot, so as to facilitate snap-fitting. During installation, the fixing member 6 is inserted into the two side panels 14 from bottom to top and pressed toward one side of the top panel 13 to achieve snap-fitting. At the same time, the top end of the fixing member 6 and the top panel 13 are guided and positioned by setting a limit hole and a limit block. When the top panel 13 is connected to the push-pull body 100, the connecting screws can be passed through the fixing member 6 and the top panel 13 and then connected to the push-pull body 100. The fixing member 6 is snap-fitted with the side panels 14, which is convenient for installing and replacing the elastic member 4.

[0058] Optionally, the highly adaptive intermediate pulley assembly further includes a washer 7, a plurality of washers 7 are provided, and the washer 7 is sleeved on the first rotating shaft 11, and / or sleeved on the second rotating shaft 12, and / or sleeved on the third rotating shaft 21. Further, it can also be sleeved on the fourth rotating shaft 24.

[0059] like Figure 2 In the illustrated embodiment, when there are only two washers 7, the two washers 7 are respectively sleeved at the two ends of the second rotating shaft 12 to be sandwiched between the first connecting rod 31 and the side plate 14, which can reduce the rotational friction between the first connecting rod 31 and the side plate 14, reduce wear, and adjust the centering position of the first connecting rod 31 relative to the two side plates 14 within a certain range. Similarly, in other embodiments, multiple washers 7 can be added, such as sleeved on the first rotating shaft 11. The friction and wear between the second connecting rod 32 and the side plate 14 can be reduced. The multiple washers 7 are sleeved on the third rotating shaft 21, which can reduce the friction and wear between the first connecting rod 31 and the second connecting rod 32 and between the first connecting rod 31 and the pulley assembly 2. The multiple washers 7 are sleeved on the fourth rotating shaft 24, which can reduce the friction and wear between the pulley 23 and the fixed plate 22. The above-mentioned multiple washers 7 have the effect of reducing friction and wear, and are also used to adjust the centering position relative to the side plate 14.

[0060] Optionally, when there is a maximum height difference between the pulley assembly 2 and the bracket 1, the first rotating shaft 11 is located at one end of the long slot hole 15 close to the second rotating shaft 12, and when there is a minimum height difference between the pulley assembly 2 and the bracket 1, the first rotating shaft 11 slides to the other end of the long slot hole 15 away from the second rotating shaft 12.

[0061] like Figure 3 The figure shows a first state schematic diagram of a maximum height difference between the pulley assembly 2 and the bracket 1. Figure 4 The diagram shows a second state diagram with a minimum height difference between the pulley assembly 2 and the bracket 1, wherein the height difference between the pulley assembly 2 and the bracket 1 is expressed by the distance between the third rotating shaft 21 and the top of the bracket 1, the maximum height difference refers to the distance L1 between the third rotating shaft 21 and the top of the bracket 1 during initial installation, at which time the first rotating shaft 11 is located at the rightmost end of the long slot hole 15; the minimum height difference is the distance L2 between the third rotating shaft 21 and the equal end of the bracket 1 after the load on the pulley assembly 2 changes, at which time the first rotating shaft 11 is located at the leftmost end of the long slot hole 15. It can be understood that when the push-pull body 100 is deformed or the guide rail is deformed, the height difference between the bracket 1 and the pulley assembly 2 will change. When the height of the end pulley assembly 200 of the push-pull body 100 is adjustable, the height adaptive change range between the bracket 1 and the pulley assembly 2 meets the height adjustment range of the end pulley assembly 200, so as to have a better fit. In the first state, the pulley assembly 2 supports the bracket 1 to fix the push-pull body 100 through the connecting rod assembly 3. The load-bearing load of the pulley assembly 2 is the same as the load-bearing load of the end pulley assemblies 200 at both ends, so as to achieve uniform load distribution. When the middle part of the push-pull body 100 sags due to long-term use, the pressure of the push-pull body 100 on the bracket 1 increases, and the first connecting rod 31 has an initial angle B with the vertical direction, B>0, and the load-bearing load of the pulley assembly 2 increases. At this time, the bottom end of the first connecting rod 31 rotates in the direction of increasing angle B, which in turn drives the second connecting rod 32 to rotate. While the bottom end of the second connecting rod 32 rotates, it drives the first rotating shaft 11 at the top to slide along the long slot hole 15, and the elastic force between the first rotating shaft 11 and the elastic member 4 increases until the load-bearing load of the pulley assembly returns to the initial value. It can be understood that the initial position of the first connecting rod 31 needs to ensure the initial rotation direction of the first connecting rod 31. The length of the long slot 15 defines the elastic force adjustment range of the elastic member 4, thereby obtaining the load adjustment range of the pulley assembly 2. Within this range, the pulley assembly 2 can be adjusted in an adaptive height.

[0062] like Figure 5The figure shows a schematic diagram of the adaptive adjustment principle of the elastic member 4, wherein the elastic force F0 of the elastic member 4 is in the horizontal direction and is consistent with the push-pull direction of the push-pull body 100. The initial value of the angle B between the first connecting rod 31 and the vertical direction is greater than 0. The initial value of the angle A between the second connecting rod 32 and the horizontal direction is greater than 0. The height difference between the pulley assembly 2 and the bracket 1 varies between the minimum value L2 and the maximum value L1, and the load-bearing load of the pulley assembly 2 remains unchanged to meet the function of load unchanged but highly adaptive.

[0063] Assuming that the load of the pulley assembly 2 is G, the elastic force of the elastic member 4 is F0, the force on the second connecting rod 32 is F1, and the angle between it and the horizontal direction is A, the force on the first connecting rod 31 is F2, and the angle between it and the vertical direction is B, according to the force balance formula, it can be obtained:

[0064] F1·cosA=F0

[0065] F1·cos A=F2·sin B

[0066] F1·sin A+F2·cos B=G

[0067] Then, the elastic force F0 of the elastic member 4 can be obtained as:

[0068]

[0069] Wherein, G is the bearing load of the pulley assembly 2, A is the angle between the second connecting rod 32 and the horizontal plane, and B is the angle between the first connecting rod 31 and the vertical direction.

[0070] By analyzing the sliding distance of the first rotating shaft 11, that is, the relationship between the compression distance and the elastic force of the elastic member 4, the elastic force curve of the elastic member 4 is approximately a straight line. Therefore, the elastic member 4 can meet the overall highly adaptive requirements of the highly adaptive intermediate pulley assembly.

[0071] In a specific application embodiment, Figure 3 In the first state shown, the distance between the top of the bracket 1 and the third rotating shaft 21 is L1 (e.g., 29.41 mm). Figure 4 In the second state shown, the distance between the top of the bracket 1 and the third rotating shaft 21 is reduced to L2 (26.41 mm), and the load-bearing load of the pulley assembly 2 remains unchanged in both states, and the elastic force of the elastic member 4 increases. It can be seen that when the compression length of the elastic member 4 along the long slot hole 15 in the first direction changes, the elastic force of the elastic member 4 increases, and the height of the pulley assembly 2 can be adaptively adjusted within the range of L1-L2, verifying the effect of the highly adaptive intermediate pulley assembly of the present invention.

[0072] The push-pull device of the present invention sets a highly adaptive middle pulley assembly in the middle of the push-pull body 100. When the load at the middle position of the push-pull body 100 changes, the highly adaptive middle pulley assembly can adaptively adjust the height of the bracket 1 and transmit it to the elastic member 4 for elastic support. The elastic member 4 can output a stable load so that the multi-point support of the push-pull body 100 is evenly stressed, thereby ensuring the service life and smoothness of the highly adaptive middle pulley assembly. The structure is simple, the function is reliable, and the cost performance is high.

[0073] The sliding body 100 mentioned in the above embodiments of the present invention may be a sliding door or a sliding window, or other long-axis sliding parts.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Highly adaptive intermediate pulley assembly, characterized in that, include: A bracket (1) for supporting a push-pull body (100), with the length direction of the bracket (1) being a first direction and the width direction of the bracket (1) being a second direction, a first rotating shaft (11) and a second rotating shaft (12) being arranged on the bracket (1) in parallel with each other at intervals along the first direction, and the first rotating shaft (11) being slidably connected to the bracket (1) along the first direction; A pulley assembly (2), wherein a third rotating shaft (21) is provided on the pulley assembly (2) along the second direction, and the third rotating shaft (21) is parallel to the second rotating shaft (12); a connecting rod assembly (3), the connecting rod assembly (3) connecting the first rotating shaft (11), the second rotating shaft (12) and the third rotating shaft (21); An elastic member (4), the elastic member (4) being arranged on the bracket (1) along the first direction, and the free end of the elastic member (4) being connected to the first rotating shaft (11); When the load-bearing capacity of the bracket (1) changes, the connecting rod assembly (3) drives the third rotating shaft (21) to stretch or compress the elastic member (4) to achieve height self-adaptation of the bracket (1); The connecting rod assembly (3) comprises: a first connecting rod (31), wherein two ends of the first connecting rod (31) are respectively pivotally connected to the second rotating shaft (12) and the third rotating shaft (21); A second connecting rod (32), wherein two ends of the second connecting rod (32) are respectively pivotally connected to the third rotating shaft (21) and the first rotating shaft (11).

2. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: It also comprises a stopper (5), the stopper (5) being sleeved on the first rotating shaft (11), the stopper (5) having a force-bearing plane on one side facing the elastic member (4), the force-bearing plane abutting against the free end of the elastic member (4).

3. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: The bracket (1) is a U-shaped structure with an opening facing downward, and comprises a top plate (13) and two side plates (14); the top plate (13) is used to connect the push-pull body (100); the side plates (14) are provided with a long slot hole (15) and a round hole (16) along the first direction; the first rotating shaft (11) is inserted into the long slot hole (15), and the second rotating shaft (12) is inserted into the round hole (16).

4. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: Two of the first connecting rods (31) and two of the second connecting rods (32) are provided respectively, and the two first connecting rods (31) and the two second connecting rods (32) are respectively provided on both sides of the pulley assembly (2).

5. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: It also comprises a fixing member (6), wherein the fixing member (6) is detachably arranged at one end of the bracket (1), and the fixing end of the elastic member (4) is fixed to the bracket (1) via the fixing member (6).

6. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: It also comprises a washer (7), a plurality of the washers (7) are provided, and the washer (7) is sleeved on the first rotating shaft (11), and / or sleeved on the second rotating shaft (12), and / or sleeved on the third rotating shaft (21).

7. The highly adaptive intermediate pulley assembly according to claim 3, characterized in that: When there is a maximum height difference between the pulley assembly (2) and the bracket (1), the first rotating shaft (11) is located at an end of the long slot hole (15) close to the second rotating shaft (12); when there is a minimum height difference between the pulley assembly (2) and the bracket (1), the first rotating shaft (11) slides to an end of the long slot hole (15) away from the second rotating shaft (12).

8. The highly adaptive intermediate pulley assembly according to claim 1, characterized in that: The elastic force F0 of the elastic member (4) satisfies: ， In the formula, G is the load-bearing capacity of the pulley assembly (2), A is the angle between the second connecting rod (32) and the horizontal plane, and B is the angle between the first connecting rod (31) and the vertical direction.

9. Push-pull device, characterized in that: It comprises a push-pull body (100), an end pulley assembly (200) and a highly adaptive intermediate pulley assembly as claimed in any one of claims 1 to 8, wherein the highly adaptive intermediate pulley assembly is arranged between the two end pulley assemblies (200) and is detachably connected to the push-pull body (100).

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