Transmission mechanism and lifting device

Abstract

A transmission mechanism and lifting device are disclosed. The mechanism includes a base, a sliding member slidably disposed on the base, a first connecting member, a second connecting member, and a drive assembly. The mechanism has a Z-direction perpendicular to the plane of the base, an X-direction consistent with the driving direction of the drive assembly, and a Y-direction perpendicular to both the Z and X directions. The first connecting member includes a connecting end and a spherical end, the connecting end being rotatably connected to the spherical end via a rotating shaft. The rotating shaft is not perpendicular to the plane of the base. The connecting end connects to the sliding member. The first end of the second connecting member has a spherical groove matching the spherical end and receives the spherical end within the spherical groove. The second end of the second connecting member connects to the drive assembly. The drive assembly is configured to drive the sliding member to slide on the base by driving the second connecting member. This mechanism, by incorporating a first connecting member and a second connecting member with multiple degrees of freedom, eliminates the constraint between the drive assembly and the sliding member, thereby improving the performance of the transmission mechanism and the lifting device.

Description

Technical Field

[0001] This application relates to the field of mechanical technology, and more specifically, to a transmission mechanism and a lifting device. Background Technology

[0002] Currently, the existing transmission mechanism 100, such as Figure 1 As shown, the lead screw 120 is driven by the motor 110 (or reducer), and the lead screw 120 drives the lead screw nut 130 to realize the sliding of the sliding member 140 on the slide rail 150.

[0003] However, due to unavoidable machining and assembly errors, existing transmission mechanisms generate noise, increase the operating load, or even jam during operation, leading to a decrease in transmission performance.

[0004] When the transmission performance of the transmission mechanism decreases, the performance of the lifting device that includes the transmission mechanism will also decrease accordingly. Summary of the Invention

[0005] The purpose of this application is to provide a transmission mechanism and a lifting device. The mechanism includes a first connector comprising a rotatable spherical end and a connecting end, a second connecting end with a spherical groove, and a sliding hole on a slider for slidably receiving the connecting end. This increases the degrees of freedom of the drive assembly and the slider in multiple directions, thereby eliminating the constraints on the drive assembly and the slider in multiple directions, and ultimately improving the performance of the transmission mechanism and the lifting device.

[0006] In a first aspect, this application provides a transmission mechanism, including a base, a slider slidably disposed on the base, a first connector, a second connector, and a drive assembly; the mechanism has a Z direction perpendicular to the plane of the base, an X direction consistent with the driving direction of the drive assembly, and a Y direction perpendicular to both the Z and X directions; the first connector includes a connecting end and a spherical end, the connecting end being rotatably connected to the spherical end via a rotating shaft; wherein the rotating shaft is not perpendicular to the plane of the base; the connecting end is connected to the slider; the first end of the second connector has a spherical groove matching the spherical end and receives the spherical end within the spherical groove; the second end of the second connector is connected to the drive assembly; the drive assembly is configured to drive the slider to slide on the base by driving the second connector; and when a first relative distance between the slider and the second connector in the Z direction changes, the change in the first relative distance is offset by rotation between the connecting end and the spherical end and rotation of the spherical end within the spherical groove.

[0007] The aforementioned transmission mechanism, with the first and second connecting members arranged between the drive component and the slide, when the relative distance between the slide and the drive component in the Z direction changes due to processing and / or assembly errors, adaptive rotation between the spherical end and the connecting end, and between the spherical end and the second connecting member, thereby offsetting the change in the relative distance between the slide and the drive component in the Z direction during the sliding process, ultimately eliminates the constraint caused by the change in the relative distance between the slide and the drive component in the Z direction during the sliding process, thus improving the transmission performance of the transmission mechanism.

[0008] In conjunction with the first aspect, optionally, the rotation axis is parallel to the X direction.

[0009] In the aforementioned transmission mechanism, when the rotation axis is parallel to the X-direction, the rotation between the spherical end and the connecting end is entirely within the YZ plane. When the same constraint needs to be eliminated by offsetting the change in the first relative distance between the sliding member and the second connecting member in the Z-direction during sliding, the rotation angle between the spherical end and the connecting end is minimized, and the rotation between the spherical end and the second connecting member is correspondingly minimized. This minimizes the wear of each component by minimizing the rotation angles between them, thus extending the service life of the transmission mechanism. Furthermore, since the rotation angles between the spherical end and the connecting end, and between the spherical end and the second connecting member, are both minimized, the follow-up motion of the rotation between the spherical end and the connecting end, and between the spherical end and the second connecting member, is also maximized, ultimately further improving the performance of the transmission mechanism.

[0010] In conjunction with the first aspect, optionally, a sliding hole is provided at the connection between the slider and the connecting end; the sliding hole is used to slidably receive the connecting end; wherein, the extending direction of the sliding hole intersects the plane containing the X and Z directions; when the second relative distance between the second connecting member and the slider in the Y direction changes, the change in the second relative distance is offset by sliding the connection within the sliding hole.

[0011] The aforementioned transmission mechanism includes a sliding hole on the sliding member for slidably receiving the connecting end. During the sliding process of the sliding member, if a change in the second relative distance in the Y direction between the second connecting member and the sliding member causes a constraint between the driving component and the sliding member, the connecting end slides within the sliding hole to counteract this change in the second relative distance. Ultimately, this eliminates the constraint caused by the change in the relative distance in the Y direction between the sliding member and the driving component during sliding, thus improving the transmission performance of the transmission mechanism.

[0012] In conjunction with the first aspect, optionally, the extending direction of the sliding hole is parallel to the Y direction.

[0013] In the aforementioned transmission mechanism, when the extension direction of the sliding hole is parallel to the Y direction, and the connecting end moves according to a corresponding vector to counteract the change in the second relative distance, the absolute value of the component vector in the Y direction of this vector is maximized. When it is necessary to eliminate the same constraint by counteracting the change in the second relative distance in the Y direction between the sliding member and the second connecting member during sliding, the connecting end slides the shortest distance inside the sliding hole. This minimizes the wear between the connecting end and the sliding hole, thereby extending the service life of the transmission mechanism. Furthermore, since the connecting end slides the shortest distance inside the sliding hole, the responsiveness of the relative sliding between the connecting end and the sliding hole is also maximized, ultimately further improving the performance of the transmission mechanism.

[0014] In conjunction with the first aspect, optionally, the sliding hole is a non-cylindrical hole, a frustum-shaped hole, or a conical hole; the shape of the connecting end matches the shape of the sliding hole to limit the rotation of the connecting end in the sliding hole.

[0015] The aforementioned transmission mechanism, through the non-cylindrical, frustum-shaped, or conical sliding hole and the connecting end matching the shape of the sliding hole, prevents the connecting end from rotating within the sliding hole when it is received inside. By restricting the rotation of the connecting end within the sliding hole, the direction of the rotation axis is locked, thereby locking the direction of relative rotation between the spherical end and the connecting end. This ensures adaptive rotation between the spherical end and the connecting end, and between the second connecting member of the spherical end, eliminating the constraint effect caused by the change in the relative distance in the Z direction between the sliding member and the driving component during sliding, further improving the transmission performance of the transmission mechanism.

[0016] In conjunction with the first aspect, optionally, the material used to make at least one of the contact surface between the base and the slider, the contact surface between the slider and the base, the spherical end, the connecting end, and the spherical groove includes a wear-resistant material.

[0017] The aforementioned transmission mechanism improves the wear resistance of the parts by using wear-resistant materials to make the friction-prone areas of each component, thereby extending the service life of the parts and even the transmission mechanism as a whole.

[0018] In conjunction with the first aspect, optionally, the driving assembly includes a lead screw and a lead screw nut sleeved on the lead screw; the lead screw is arranged along the X direction; the lead screw nut is connected to the second connecting member; a first slide rail and a second slide rail are provided on the base; the first slide rail and the second slide rail are configured to receive the sliding member to realize the sliding of the sliding member relative to the first slide rail and the second slide rail.

[0019] The aforementioned transmission mechanism, due to the ease of setting the drive stroke of the "lead screw + lead screw nut" drive assembly as needed, and the ability to drive the sliding member to and hold at any position as required, thus improving the convenience of the transmission mechanism. However, when there are two or more slide rails (first slide rail and second slide rail), machining and assembly errors are more likely to occur between the slide rails. Therefore, the transmission mechanism provided in this application better offsets the aforementioned errors, thereby improving the transmission performance of the transmission mechanism including the lead screw and lead screw nut.

[0020] In conjunction with the first aspect, optionally, the base is provided with a receiving seat for receiving the lead screw; a first shock-absorbing pad is provided between the receiving seat and the base.

[0021] The aforementioned transmission mechanism, by setting a first damping pad between the receiving seat of the lead screw and the base, allows the lead screw to adaptively change its distance from the base through the first damping pad, thereby eliminating the constraint between the drive assembly and the sliding member. This further improves the transmission performance of the transmission mechanism.

[0022] Secondly, embodiments of this application also provide a lifting device, including: a lifting plate, a scissor lift assembly, and a transmission mechanism as described in any of the optional embodiments above; the scissor lift assembly extends and retracts along the Z direction and includes a first connecting end, a second connecting end, a third connecting end, and a fourth connecting end; the first connecting end and the second connecting end are distributed along the X direction, and the third connecting end and the fourth connecting end are distributed along the X direction; the first connecting end and the third connecting end are distributed along the Z direction, and the second connecting end and the fourth connecting end are distributed along the Z direction; the first connecting end is connected to a sliding member or the first connecting member of the transmission mechanism, the second connecting end is connected to the base, the third connecting end is slidably connected to the lifting plate, and the fourth connecting end is rotatably connected to the lifting plate; or the second connecting end is connected to a sliding member or the first connecting member of the transmission mechanism, the first connecting end is connected to the base, the fourth connecting end is slidably connected to the lifting plate, and the third connecting end is rotatably connected to the lifting plate.

[0023] The aforementioned lifting device, by incorporating the transmission mechanism described in the preceding embodiments, and through the rotation between the spherical end and the connecting end, the rotation between the spherical end and the spherical groove, and the sliding between the connecting end and the sliding hole in the transmission mechanism, eliminates the internal constraints of parts caused by processing and / or assembly errors in the lifting device. By improving the transmission performance of the transmission mechanism, the performance of the lifting device is improved, and the service life of the lifting device is extended.

[0024] In conjunction with the second aspect, optionally, the driving component further includes a motor; the motor is disposed on the base and configured to drive the sliding member to slide on the base by outputting power; a second shock-absorbing pad is disposed between the motor and the base.

[0025] The aforementioned lifting device, by installing a second damping pad between the motor and the base, buffers the vibrations generated during motor operation, thereby improving the stability of the lifting device. Furthermore, in the case of a rigid connection between the motor and the lead screw, the installation of the second damping pad allows the distance between the motor and the base to be adaptively changed, thus helping to eliminate constraints between the motor and the base, and between the sliding component and the lead screw, further improving the performance of the lifting device and extending its service life.

[0026] The transmission mechanism and lifting device provided in this application utilize a first connector comprising a rotatable spherical end and a connecting end, and a second connector with a spherical groove. This compensates for changes in the first relative distance between the second connectors in the Z direction caused by machining and / or assembly errors, thereby eliminating the constraint between the sliding member and the drive mechanism caused by this change in the first relative distance. Simultaneously, by providing a sliding hole on the sliding member for slidably receiving the connecting end, the sliding between the connecting end and the sliding hole compensates for changes in the second relative distance between the second connector and the sliding member in the Y direction caused by machining and / or assembly errors, thereby eliminating the constraint between the sliding member and the drive mechanism caused by this change in the second relative distance. In other words, the aforementioned constraints are eliminated through multiple degrees of freedom between the spherical end and the spherical groove, between the spherical end and the connecting end, and between the connecting end and the sliding groove. By eliminating these constraints, noise between parts is eliminated, the load on the drive assembly is reduced, and ultimately, the transmission performance of the transmission mechanism is improved. At the same time, by eliminating these constraints, noise between the parts of the lifting device is also eliminated, the load on the electrodes is reduced, and ultimately the performance of the lifting device, including the transmission mechanism, is improved, and its service life is extended. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A 3D view of the existing transmission mechanism;

[0029] Figure 2 A perspective view of the transmission mechanism provided in the embodiments of this application;

[0030] Figure 3 A top view of the transmission mechanism provided in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the first connector provided in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram illustrating the fit between the spherical end and the spherical groove in an embodiment of this application.

[0033] Figure 6 A perspective view of the lifting device provided in the embodiments of this application.

[0034] Icons: 100, Existing transmission mechanism; 110, Motor; 120, Lead screw; 130, Lead screw nut; 140, Sliding component; 150, Slide rail; 160, Base; 200, Transmission mechanism; 210, Base; 211, First slide rail; 212, Second slide rail; 213, Support; 220, Sliding component; 221, Sliding hole; 230, First connector; 231, Connecting end; 232, Spherical end; 233, Rotating shaft; 240, Second connector; 241, Spherical groove; 242, Ball bearing; 250, Drive assembly; 251, Lead screw; 252, Lead screw nut; 253, Motor; 300, Lifting device; 310, Scissor lift assembly; 311, First connecting end; 312, Second connecting end; 313, Third connecting end; 314, Fourth connecting end; 320, Lifting plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Please continue to refer to Figure 1 In the existing transmission mechanism 100, all components are rigidly connected, resulting in insufficient degrees of freedom between parts that have mating motion. Furthermore, if errors occur during machining and assembly, the mating motion between parts will be constrained.

[0042] For example, the slider 140 and the slide rail 150 are simply slidably mounted on the slide rail 150. However, insufficient machining and assembly precision can cause the two slide rails 150 to be not perfectly parallel. During the sliding process of the slider 140, it will be squeezed or stretched by the slide rail 150 in a direction perpendicular to the slide rail. Furthermore, insufficient machining and assembly precision can cause the two slide rails 150 to be at different heights in the direction perpendicular to the base 160. This height difference causes the slider 140 to rotate a certain angle around the slide rail 150 during assembly or movement, but the slider 140 cannot rotate around the slide rail 150, thus failing to offset the torque caused by this assembly error. Both situations in this example ultimately result in constrained cooperative movements between the parts of the transmission mechanism.

[0043] During the operation of the transmission mechanism, the movement between parts is constrained, leading to a decrease in the transmission performance of the mechanism and consequently a decrease in the performance of the lifting device. To address the aforementioned technical problems, this application provides a transmission mechanism and a lifting device. Specifically, please refer to the embodiments and accompanying drawings provided in this application.

[0044] Please refer to Figures 2 to 4 , Figure 2 This is a perspective view of the transmission mechanism 200 provided in the embodiments of this application; Figure 3 This is a top view of the transmission mechanism 200 provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the first connector 230 provided in this embodiment. The transmission mechanism 200 provided in this embodiment includes a base 210, a slider 220 slidably disposed on the base 210, a first connector 230, a second connector 240, and a drive assembly 250. The mechanism has a Z-direction perpendicular to the plane of the base 210, an X-direction consistent with the driving direction of the drive assembly 250, and a Y-direction perpendicular to both the Z and X directions. The first connector 230 includes a connecting end 231 and a spherical end 232, the connecting end 231 being rotatably connected to the spherical end 232 via a rotating shaft 233. The rotating shaft 233 is not perpendicular to the plane of the base 210. The connecting end 231 is connected to the slider 220. The first end of the second connector 240 has a spherical groove 241 that matches the spherical end 232 and receives the spherical end 232 within the spherical groove 241. The second end of the second connector 240 is connected to the drive assembly 250. The drive assembly 250 is configured to drive the slider 220 to slide on the base 210 by driving the second connector 240. And when the first relative distance between the slider 220 and the second connector 240 in the Z direction changes, the change in the first relative distance is counteracted by rotation between the connecting end 231 and the spherical end 232 and rotation of the spherical end 232 within the spherical groove 241.

[0045] The aforementioned drive assembly 250 includes, but is not limited to, configurations such as "lead screw + lead screw nut", "lead screw + lead screw nut + motor (reducer)", cylinder, and "cylinder + linear bearing". When the drive assembly 250 is "lead screw + lead screw nut", the lead screw nut sleeved on the lead screw can be connected to the sliding member 220, and the rotation of the lead screw drives the lead screw nut to perform linear or linear reciprocating motion, thereby driving the sliding member 220 to slide. When the drive assembly 250 is "lead screw + lead screw nut + motor (reducer)", the motor (reducer) drives the lead screw 251 to rotate. When the drive assembly 250 is a cylinder, the output shaft of the cylinder can be directly connected to the sliding member 220, and the cylinder directly drives the sliding member 220 to perform linear or linear reciprocating motion. When the drive assembly 250 is "cylinder + linear bearing", the cylinder can be used to directly or indirectly drive the sliding member 220 to perform linear or linear reciprocating motion.

[0046] The connection method between the connecting end 231 of the first connector 230 and the slider 220 can be a fixed connection, a detachable connection, a rotatable connection, or a sliding connection, etc. Meanwhile, the shape of the connecting end 231 is determined according to the specific connection method. Therefore, those skilled in the art can determine the corresponding shape of the connecting end 231 based on actual needs and adaptability to the corresponding connection method. The spherical end 232 can be a complete sphere or a partial sphere. This application embodiment does not impose specific limitations on the connection method between the connecting end 231 and the slider 220, the shape of the connecting end 231, or the shape of the spherical end 232.

[0047] The sliding of the slider 220 on the base 210 can be achieved by providing a slide rail or slide groove on the base 210 to receive the slider 220.

[0048] When the first relative distance in the Z direction between the slider 220 and the second connector 240 changes, for example, due to machining and / or assembly errors, the height of the slide rail in the Z direction fluctuates. Since the slider 220 is connected to both the slide rail and the drive assembly 250, it will rotate in the YZ plane during its sliding process, following the height fluctuations of the slide rail. However, the connection between the slider 220 and the slide rail constrains the rotation of the slider 220 in this YZ plane. In many cases (such as in a double slide rail configuration, where a lead screw nut simultaneously connects two second connectors 240 or two first connectors 230; or, for example, a cylinder output shaft rigidly connected to a second connector 240), the second connector 240 cannot rotate arbitrarily in the YZ plane without constraint. Therefore, by rotating between the connecting end 231 of the connecting slider 220 and the spherical end 232 of the connecting second connector 240, while the spherical end 232 and the spherical groove 241 rotate adaptively, the changes in the height of the slide rail caused by such processing and / or assembly errors are accommodated, thereby offsetting the change in the first relative distance.

[0049] It should be understood that the undulation in height along the Z direction necessitates adaptive rotation of the slider 220 and the second connector 240 within the YZ plane to accommodate this assembly error and eliminate the constraint. Since the constraint is eliminated through rotation between the spherical end 232 and the connecting end 231, and between the spherical end 232 and the second connector 240, the rotation between the spherical end 232 and the connecting end 231, and between the spherical end 232 and the second connector 240, should also be within the YZ plane. Therefore, as long as the rotation axis 233 is not perpendicular to the plane containing the base 210 (i.e., the XY plane), rotation can occur between the projections of the spherical end 232 and the connecting end 231 within the YZ plane, thereby eliminating the constraint and offsetting the change in the first relative distance.

[0050] It is worth mentioning that the technical problem to be solved by the embodiments of this application is not limited to the examples discussed above, but rather the constraint between the transmission mechanism 200 and the sliding member 220 described in the above examples. The reasons for such constraint are not limited to the examples mentioned above, and may include other reasons. In this regard, the embodiments of this application will not elaborate on them one by one.

[0051] In the above implementation process, the first connecting member 230 and the second connecting member 240 are provided between the drive component 250 and the sliding component. When the relative distance between the sliding component 220 and the drive component 250 in the Z direction changes due to processing and / or assembly errors, the ball end 232 and the connecting end 231, and the ball end 232 and the second connecting member 240 are adaptively rotated. This offsets the change in the first relative distance between the sliding component 220 and the second connecting member 240 in the Z direction during the sliding process, thereby canceling the change in the relative distance between the sliding component 220 and the drive component 250 in the Z direction during the sliding process. Ultimately, the constraint caused by the change in the relative distance between the sliding component 220 and the drive component 250 in the Z direction during the sliding process is eliminated, and the transmission performance of the transmission mechanism 200 is improved.

[0052] Please continue to refer to Figures 2 to 4 In one alternative implementation, the rotation axis 233 is parallel to the X direction.

[0053] In the above implementation process, when the rotation axis 233 is parallel to the X direction, as discussed in the previous embodiments, the rotation between the spherical end 232 and the connecting end 231 is entirely a rotation within the YZ plane. When it is necessary to eliminate the same constraint by offsetting the change in the first relative distance in the Z direction between the sliding member 220 and the second connecting member 240 during sliding, the rotation angle between the spherical end 232 and the connecting end 231 is minimized, and the rotation between the spherical end 232 and the second connecting member 240 is correspondingly minimized. This minimizes the wear of each component by minimizing the rotation angles between them, thus extending the service life of the transmission mechanism 200. Furthermore, since the rotation angles between the spherical end 232 and the connecting end 231, and between the spherical end 232 and the second connecting member 240 are both minimized, the responsiveness of the rotation between the spherical end and the connecting end 231, and between the spherical end 232 and the second connecting member 240, is also maximized, ultimately further improving the performance of the transmission mechanism 200.

[0054] Please continue to refer to Figures 2 to 4 In one optional embodiment, a sliding hole 221 is provided at the connection between the slider 220 and the connecting end 231. The sliding hole 221 is used to slidably receive the connecting end 231. The extending direction of the sliding hole 221 intersects the plane containing the X and Z directions. When the second relative distance between the second connecting member 240 and the slider 220 in the Y direction changes, the change in the second relative distance is offset by sliding within the sliding hole 221.

[0055] The sliding hole 221 provided at the connection between the aforementioned slider 220 and the connecting end 231 can be a through hole or a blind hole. The blind hole can be a deep hole or a shallow hole. This application embodiment does not specifically limit the type or depth of the sliding hole 221. Correspondingly, to accommodate the shape of the sliding hole 221, the connecting end 231 can be a strip-shaped connecting end.

[0056] For example, due to machining and / or assembly errors, the linear direction of the lead screw is not parallel to the linear direction of the slide rail. Furthermore, the linear directions in which the projections of the lead screw and the slide rail lie in the XY plane are also not parallel. This results in different distances between the lead screw and the slide rail as the slider 220 slides to different positions. During the sliding of the slider 220, the second relative distance in the Y direction between the second connecting member 240 and the slider 220 also changes. By sliding the connecting end 231 within the sliding hole 221 provided on the slider 220, this difference in distance can be accommodated, thereby offsetting the change in the second relative distance. Ultimately, the constraint caused by the non-parallelism of the linear directions in which the projections of the lead screw and the slide rail lie in the XY plane is eliminated.

[0057] It should be understood that, in order to counteract the change in the second relative distance in the Y direction between the second connecting member 240 and the sliding member 220 during the sliding process of the sliding member 220, a sliding hole 221 is provided on the sliding member 220 for slidably receiving the connecting end 231. Therefore, the extending direction of the sliding hole 221, which is also the sliding direction of the connecting end 231, should have a component in the Y direction. In other words, when the connecting end 231 moves according to a corresponding vector to counteract the change in the second relative distance, the component vector in the Y direction is not zero. Therefore, the extending direction of the sliding hole 221 intersects the plane containing the X and Z directions.

[0058] It is worth mentioning that the technical problem to be solved by the embodiments of this application is not limited to the examples discussed above, but rather to the constraint between the transmission mechanism 200 and the sliding member 220 caused by the change in the second relative distance in the Y direction between the second connecting member 240 and the sliding member 220 during the sliding process of the sliding member 220. The reasons for such constraint are not limited to the examples mentioned above, and may include other reasons. These will not be elaborated upon in the embodiments of this application.

[0059] In the above implementation, a sliding hole 221 is formed on the slider 220 for slidably receiving the connecting end 231. During the sliding of the slider 220, if the second relative distance in the Y direction between the second connecting member 240 and the slider 220 changes, thereby causing a constraint between the drive assembly 250 and the slider 220, the connecting end 231 slides within the sliding hole 221 to counteract this change in the second relative distance. Ultimately, the constraint caused by the change in the relative distance in the Y direction between the slider 220 and the drive assembly 250 during sliding is eliminated, improving the transmission performance of the transmission mechanism 200.

[0060] Please continue to refer to Figures 2 to 4 In one optional embodiment, the sliding hole 221 extends in a direction parallel to the Y direction.

[0061] In the above implementation process, when the extension direction of the sliding hole 221 is parallel to the Y direction, as discussed in the previous embodiments, when the connecting end 231 moves according to a certain adaptive vector to counteract the change in the second relative distance, the absolute value of the component vector in the Y direction of this vector is the largest. When it is necessary to eliminate the same constraint by counteracting the change in the second relative distance in the Y direction between the sliding member 220 and the second connecting member 240 during the sliding process, the connecting end 231 slides the shortest distance inside the sliding hole 221. This minimizes the wear of the connecting end 231 and the sliding hole 221 by minimizing the relative sliding distance between them, thus extending the service life of the transmission mechanism 200. Furthermore, since the connecting end 231 slides the shortest distance inside the sliding hole 221, the responsiveness of the relative sliding between the connecting end 231 and the sliding hole 221 is also the highest, ultimately further improving the performance of the transmission mechanism 200.

[0062] In one alternative embodiment, the sliding hole 221 is a non-cylindrical hole, a frustum-shaped hole, or a conical hole. The shape of the connecting end 231 matches the shape of the sliding hole 221 to limit the rotation of the connecting end 231 within the sliding hole 221.

[0063] The shape of the sliding hole 221 can be a triangular prism, a quadrangular prism, a pentagonal prism, or even an elliptical cylinder; the shape of the sliding hole 221 can also be a triangular frustum, a quadrangular frustum, a pentagonal frustum, or even an elliptical frustum; the shape of the sliding hole 221 can also be a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, or even an elliptical pyramid.

[0064] In the above implementation process, through the non-cylindrical, frustum-shaped, or conical sliding hole 221 and the connecting end 231 matching the shape of the sliding hole 221, when the connecting end 231 is received in the sliding hole 221, the connecting end 231 cannot rotate within the sliding hole 221. By restricting the rotation of the connecting end 231 within the sliding hole 221, the direction of the rotation axis 233 is locked, thereby locking the direction of relative rotation between the spherical end 232 and the connecting end 231. This ensures adaptive rotation between the spherical end 232 and the connecting end 231, and between the second connecting member 240 of the spherical end 232, eliminating the constraint effect caused by the change in the relative distance in the Z direction between the sliding member 220 and the drive assembly 250 during sliding, further improving the transmission performance of the transmission mechanism 200.

[0065] In one optional embodiment, at least one of the contact surfaces of the base 210 and the slider 220, the contact surfaces of the slider 220 and the base 210, the spherical end 232, the connecting end 231, and the spherical groove 241 is made of a wear-resistant material.

[0066] The aforementioned wear-resistant materials include, but are not limited to: wear-resistant steel, wear-resistant cast iron, and wear-resistant plastics.

[0067] In the above process, by making the friction parts of each part with wear-resistant materials, the wear resistance of the parts is improved, thereby extending the service life of the parts and even the transmission mechanism 200.

[0068] Please continue to refer to Figures 2 to 4 In one optional embodiment, the drive assembly 250 includes a lead screw 251 and a lead screw nut 252 sleeved on the lead screw 251. The lead screw 251 is arranged along the X direction. The lead screw nut is connected to the second connector 240. A first slide rail 211 and a second slide rail 212 are provided on the base 210. The first slide rail 211 and the second slide rail 212 are configured to receive a sliding member 220 to allow the sliding member 220 to slide relative to the first slide rail 211 and the second slide rail 212.

[0069] In the above implementation process, the driving stroke of the drive assembly 250 of "lead screw 251 + lead screw nut 252" can be easily set as needed, and the sliding member 220 can be driven to any position and stay at that position as required, thereby improving the convenience of the transmission mechanism 200. Meanwhile, when the number of slide rails is two (first slide rail 211 and second slide rail 212) or more, machining errors and assembly errors are more likely to occur between the slide rails. Therefore, the transmission mechanism 200 provided in this application better offsets the above-mentioned errors, thereby improving the transmission performance of the transmission mechanism 200 including lead screw 251 and lead screw nut 252.

[0070] Please continue to refer to Figures 2 to 4 In one optional embodiment, a receiving seat 213 for receiving the lead screw 251 is provided on the base 210. A first damping pad (not shown in the figure) is provided between the receiving seat 213 and the base 210.

[0071] In the above implementation process, by setting a first damping pad between the receiving seat 213 of the receiving screw 251 and the base 210, the distance between the screw 251 and the base 210 can be adaptively changed by the first damping pad, thereby eliminating the constraint between the drive assembly 250 and the sliding member 220. This further improves the transmission performance of the transmission mechanism 200.

[0072] Please refer to Figure 5 , Figure 5 This is a schematic diagram showing the fit between the spherical end 232 and the spherical groove 241 provided in an embodiment of this application. In an optional embodiment, a plurality of ball bearings 242 are provided between the spherical end 232 and the spherical groove 241.

[0073] In the above implementation process, by setting a ball 242 between the spherical end 232 and the spherical groove 241, the friction between the spherical end 232 and the spherical groove 241 is reduced, the smoothness of rotation between the spherical end 232 and the spherical groove 241 is improved, thereby improving the transmission performance of the transmission mechanism 200, and also extending the service life of the spherical end 232 and the spherical groove 241, thereby extending the service life of the transmission mechanism 200.

[0074] Please combine Figures 1 to 5 Reference Figure 6 , Figure 6 This is a perspective view of the lifting device 300 provided in an embodiment of this application. The lifting device 300 includes: a lifting plate 320, a scissor lift assembly 310, and a transmission mechanism 200 as described in any of the above embodiments. The scissor lift assembly 310 extends and retracts along the Z-direction and includes a first connecting end 311, a second connecting end 312, a third connecting end 313, and a fourth connecting end 314. The first connecting end 311 and the second connecting end 312 are distributed along the X-direction, and the third connecting end 313 and the fourth connecting end 314 are distributed along the X-direction. The first connecting end 311 and the third connecting end 313 are distributed along the Z-direction, and the second connecting end 312 and the fourth connecting end 314 are distributed along the Z-direction. The first connecting end 311 is connected to the sliding member 220 or the first connecting member 230 of the transmission mechanism 200; the second connecting end 312 is connected to the base 210; the third connecting end 313 is slidably connected to the lifting plate 320; and the fourth connecting end 314 is rotatably connected to the lifting plate 320. Alternatively, the second connecting end 312 is connected to the sliding member 220 or the first connecting member 230 of the transmission mechanism 200; the first connecting end 311 is connected to the base 210; the fourth connecting end 314 is slidably connected to the lifting plate 320; and the third connecting end 313 is rotatably connected to the lifting plate 320.

[0075] The aforementioned scissor fork assembly 310 includes scissor fork components (not shown in the figure), which include a first scissor fork arm (not shown in the figure) and a second scissor fork arm (not shown in the figure). The middle portions of the first scissor fork arm and the middle portions of the second scissor fork arm are connected by a swivel pin. It is worth mentioning that the scissor fork assembly 310 may include only one set of scissor fork components, or it may include at least two scissor fork components.

[0076] In the above implementation process, by setting the transmission mechanism 200 described in the foregoing embodiment in the lifting device 300, and by the rotation between the spherical end 232 and the connecting end 231, the rotation between the spherical end 232 and the spherical groove 241, and the sliding between the connecting end 231 and the sliding hole 221 in the transmission mechanism 200, the internal constraints of the parts caused by processing and / or assembly errors in the lifting device 300 are eliminated. By improving the transmission performance of the transmission mechanism 200, the performance of the lifting device 300 is improved, and the service life of the lifting device 300 is extended.

[0077] In one optional embodiment, the drive assembly 250 further includes a motor 253. The motor 253 is disposed on the base 210 and configured to drive the slider 220 to slide on the base 210 by outputting power. A second damping pad is disposed between the motor 253 and the base 210.

[0078] The aforementioned lifting device 300 includes a lifting device 300 for lifting a medical bed. The aforementioned lifting plate 320 includes a lifting bed plate.

[0079] In the above implementation process, by setting a second damping pad (not shown in the figure) between the motor 253 and the base 210, the vibration generated by the operation of the motor 253 is buffered, improving the stability of the lifting device 300. Furthermore, in the case where the motor 253 and the lead screw 251 are rigidly connected, by setting the second damping pad between the motor 253 and the base 210, the distance between the motor 253 and the base 210 can be adaptively changed, thereby helping to eliminate constraints between the motor 253 and the base 210, and between the sliding member 220 and the lead screw 251, further improving the performance of the lifting device 300 and extending its service life. When the lifting device 300 provided in this application is applied to liftable clothes racks, car seats, lifting tables, lifting parking spaces, etc., it improves the operating performance of liftable clothes racks, car seats, lifting tables, and lifting parking spaces, eliminates noise, and extends their service life. In particular, applying the aforementioned lifting device 300 to the lifting medical bed further improves the performance of the lifting medical bed, eliminates noise to enhance the user experience, and extends the service life of the lifting medical bed.

[0080] In summary, the transmission mechanism 200 and lifting device 300 provided in this application, wherein the transmission mechanism 200 comprises a first connector 230 having rotatable spherical ends 232 and connecting ends 231, and a second connector 240 having spherical grooves 241, offset the change in the first relative distance between the second connectors 240 in the Z direction caused by machining and / or assembly errors, thereby eliminating the constraint between the sliding member 220 and the drive mechanism caused by the change in the first relative distance. Simultaneously, by providing a sliding hole 221 on the sliding member 220 for slidably receiving the connecting ends 231, the sliding between the connecting ends 231 and the sliding hole 221 offsets the change in the second relative distance between the second connector 240 and the sliding member 220 in the Y direction caused by machining and / or assembly errors, thereby eliminating the constraint between the sliding member 220 and the drive mechanism caused by the change in the second relative distance. In other words, the aforementioned constraints are eliminated through multiple degrees of freedom between the spherical end 232 and the spherical groove 241, between the spherical end 232 and the connecting end 231, and between the connecting end 231 and the sliding groove. By eliminating these constraints, noise between parts is eliminated, the load on the drive assembly 250 is reduced, and ultimately the transmission performance of the transmission mechanism 200 is improved. At the same time, by eliminating these constraints, noise between parts of the lifting device 300 is also eliminated, the load on the electrodes is reduced, and ultimately the performance of the lifting device 300, including the transmission mechanism 200, is improved, and its service life is extended.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transmission mechanism, characterized by, The mechanism comprises a base, a slider slidingly arranged on the base, a first connecting member, a second connecting member, and a driving assembly; The mechanism has a Z direction perpendicular to the plane of the base, an X direction consistent with the driving direction of the driving assembly, and a Y direction perpendicular to both the Z direction and the X direction; The first connecting member comprises a connecting end and a spherical end, the connecting end being rotatably connected to the spherical end via a rotation shaft; wherein the rotation shaft is not perpendicular to the plane of the base; The connecting end is connected to the slider; The first end of the second connecting member has a spherical groove matching the spherical end, and the spherical end is received in the spherical groove; The second end of the second connecting member is connected to the driving assembly; The driving assembly is configured to drive the slider to slide on the base by driving the second connecting member; and When a first relative distance between the slider and the second connecting member in the Z direction changes, the change in the first relative distance is offset by rotation between the connecting end and the spherical end and rotation of the spherical end in the spherical groove; A sliding hole is arranged at the connection between the slider and the connecting end; the sliding hole is used to slidably receive the connecting end; The extension direction of the sliding hole intersects the plane of the X direction and the Z direction; When a second relative distance between the second connecting member and the slider in the Y direction changes, the change in the second relative distance is offset by sliding of the connection in the sliding hole.

2. The transmission mechanism according to claim 1, characterized in that Wherein, The rotation shaft is parallel to the X direction.

3. The transmission mechanism of claim 1, wherein Wherein, The extension direction of the sliding hole is parallel to the Y direction.

4. The transmission mechanism of claim 1, wherein Wherein, The sliding hole is a non-cylindrical hole, a circular truncated cone hole, or a circular conical hole; The shape of the connecting end matches the shape of the sliding hole to limit the rotation of the connecting end in the sliding hole.

5. The transmission of claim 1, wherein At least one of the contact surface of the base in contact with the slider, the contact surface of the slider in contact with the base, the spherical end, the connecting end, and the spherical groove is made of wear-resistant material.

6. The transmission mechanism according to any one of claims 1 to 5, characterized in that Wherein, The driving assembly comprises a lead screw and a lead screw nut sleeved on the lead screw; The lead screw is arranged along the X direction; The lead screw nut is connected to the second connecting member; The base is provided with a first sliding rail and a second sliding rail; The first sliding rail and the second sliding rail are configured to receive the slider to realize the sliding of the slider relative to the first sliding rail and the second sliding rail.

7. The transmission mechanism of claim 6, wherein The base is provided with a receiving seat receiving the lead screw; A first shock-absorbing pad is arranged between the receiving seat and the base.

8. A lifting device, characterized in that Comprise: A lifting plate, a scissor assembly, and a transmission mechanism according to any one of claims 1 to 7; The scissor assembly is telescopic along the Z direction and comprises a first connecting end, a second connecting end, a third connecting end, and a fourth connecting end; The first connecting end and the second connecting end are distributed along the X direction, and the third connecting end and the fourth connecting end are distributed along the X direction; The first connecting end and the third connecting end are distributed along the Z direction, and the second connecting end and the fourth connecting end are distributed along the Z direction; The first connecting end is connected with the sliding piece of the transmission mechanism or the first connecting piece, the second connecting end is connected with the base, the third connecting end is slidingly connected with the lifting plate, and the fourth connecting end is rotatably connected with the lifting plate. The second connecting end is connected with the sliding piece of the transmission mechanism or the first connecting piece, the first connecting end is connected with the base, the fourth connecting end is slidingly connected with the lifting plate, and the third connecting end is rotatably connected with the lifting plate.

9. The lift device of claim 8, wherein, The driving assembly comprises a motor. The motor is arranged on the base and is configured to output power to drive the sliding piece to slide on the base. A second damping pad is arranged between the motor and the base.

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