Floating connection device, ball screw mechanism and transmission device

Abstract

This utility model belongs to the field of mechanical transmission technology, and discloses a floating connection device, a lead screw and nut mechanism, and a transmission device. The floating connection device is used to connect a transmission mechanism and a load mechanism, including a floating mechanism and a first adjusting member, a second adjusting member, and a third adjusting member movably connected to the floating mechanism. The transmission mechanism includes a transmission rod and a movable member that can move along the axial direction of the transmission rod. The floating mechanism is connected to the load mechanism and has a floating space, within which the movable member is at least partially movable. The first and second adjusting members can both move closer to or further away from the movable member along a first direction, and respectively abut against the movable member on both sides along the first direction. The movable member has a limiting plane, and the third adjusting member can move closer to or further away from the limiting plane along a second direction. The first direction is the axial direction of the transmission rod, and the second direction is the radial direction of the transmission rod. This device, while compensating for errors, can reduce or even eliminate internal friction and compression within the mechanism, extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a floating connection device, a lead screw and nut mechanism, and a transmission device. Background Technology

[0002] Linear transmission is a common mechanical transmission method. For example, a lead screw and nut mechanism drives a load assembly mounted on a linear guide. The connection between the lead screw and nut mechanism and the load assembly typically falls into two categories: fixed connection and floating connection. With a fixed connection, since the connected parts are fixed, there are no gaps between them, resulting in high connection precision. However, installation errors and dimensional errors between the lead screw and nut mechanism and the guide rail can adversely affect the transmission, especially easily damaging the lead screw and nut mechanism. With a floating connection, because there are minute gaps between the connected parts, the connection precision is relatively lower, but it can compensate for installation errors and dimensional errors between the lead screw and nut mechanism and the guide rail, optimizing the force distribution on the mechanism.

[0003] In related technologies, such as Figure 1 and Figure 2 As shown, the load assembly 1′ is mounted on the fixed plate 3′ via the linear guide rail 2′. The transmission nut 4′ is sleeved on the transmission screw 5′. One end of the floating component 6′ is fixedly connected to the transmission nut 4′ with a screw, and the other end is provided with a plug 61′. The load assembly 1′ is provided with a socket 11′. The plug 61′ is inserted into the socket 11′, and there is a gap between the plug 61′ and the inner wall of the socket 11′. When the transmission nut 4′ moves left and right along the transmission screw 5′, the floating component 6′ drives the load assembly 1′ to move along the linear guide rail 2′ through the cooperation between the plug 61′ and the socket 11′. Due to the clearance fit between the plug 61′ and the socket 11′, the plug 61′ can move adaptively within the socket 11′ to compensate for installation errors and dimensional errors between the screw and nut mechanism, the linear guide rail 2′, and other parts.

[0004] The above solution has the following drawbacks: When the floating component 6′ drives the load component 1′ to move along the linear guide rail 2′ through the cooperation of the insert block 61′ and the insertion hole 11′, the insert block 61′ will also generate a reaction force on the floating component 6′. This reaction force is eventually transmitted to the transmission screw 5′ through the transmission nut 4′. Moreover, the direction of this reaction force is not on the same straight line as the axis of the transmission screw 5′. The distance between the axis of the insert block 61′ and the axis of the transmission screw 5′ is large, which causes the transmission nut 4′ to generate a large torque on the transmission screw 5′, increases the friction between the transmission nut 4′ and the transmission screw 5′, and shortens the service life of the screw nut mechanism. Utility Model Content

[0005] The purpose of this utility model is to provide a floating connection device, a lead screw and nut mechanism and a transmission device, which can compensate for installation errors and dimensional errors, reduce or even eliminate internal friction and compression of the lead screw and nut mechanism, and extend the service life of the lead screw and nut mechanism.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a floating connection device is provided for connecting a transmission mechanism and a load mechanism, wherein the transmission mechanism includes a transmission rod and a movable member connected to the transmission rod, and the movable member is movable along the axial direction of the transmission rod;

[0008] The floating connection device includes a floating mechanism and a first adjusting member, a second adjusting member, and a third adjusting member movably connected to the floating mechanism;

[0009] The floating mechanism is connected to the load mechanism and is provided with a floating space, and the moving part is at least partially movable within the floating space;

[0010] Both the first adjusting member and the second adjusting member can move closer to or further away from the moving member along a first direction. The first adjusting member and the second adjusting member respectively abut against the moving member on both sides along the first direction. The moving member is provided with a limiting plane, and the third adjusting member can move closer to or further away from the limiting plane along a second direction.

[0011] Wherein, the first direction is the axial direction of the transmission rod, and the second direction is the radial direction of the transmission rod.

[0012] As an optional solution to the floating connection device provided by this utility model, the floating mechanism includes a pressure plate and a floating component;

[0013] The pressure plate is connected to the first end of the floating member along the first direction, the pressure plate and the floating member enclose the floating space, and the second end of the floating member is connected to the load mechanism;

[0014] The first adjusting member is connected to the floating member, and the second adjusting member is connected to the pressure plate.

[0015] As an optional solution of the floating connection device provided by this utility model, the moving part includes a mating part and a flange part connected to the mating part. The mating part is sleeved on the transmission rod, and the flange part is located in the floating space and is provided with the limiting plane.

[0016] The floating component includes a first connecting plate and a boss protruding from the first connecting plate. The first connecting plate is provided with a through hole for the mating part to pass through. The pressure plate is connected to the boss. The floating space is formed between the first connecting plate, the boss and the pressure plate. The pressure plate is provided with a relief groove. The transmission rod enters the relief groove along the second direction.

[0017] The first adjusting member is connected to the first connecting plate, and the third adjusting member is connected to the boss.

[0018] As an optional solution for the floating connection device provided by this utility model, one of the boss and the pressure plate is provided with a slot, and the other of the boss and the pressure plate is engaged in the slot.

[0019] The floating connection device further includes a first fastener, through which the pressure plate is connected to the boss.

[0020] As an optional solution to the floating connection device provided by this utility model, the floating component further includes a second connecting plate, which is attached and connected to the load mechanism;

[0021] The second connecting plate and the boss are located on both sides of the flange portion along the second direction.

[0022] As an optional solution for the floating connection device provided by this utility model, the first adjusting member is provided with at least one set, each set including two first adjusting members symmetrically distributed on both sides of the transmission rod;

[0023] And / or, the second adjusting member is provided with at least one set, each set including two second adjusting members symmetrically distributed on both sides of the transmission rod;

[0024] And / or, there are two third adjusting members, which are symmetrically arranged with respect to the axis of the transmission rod.

[0025] As an optional solution to the floating connection device provided by this utility model, the first adjusting member and the second adjusting member are arranged facing each other in the first direction.

[0026] As an optional solution for the floating connection device provided by this utility model, the first adjusting member includes a first screw and a first nut. The first screw is threaded onto the floating mechanism, and the first nut is sleeved on the first screw and stops on the side of the floating mechanism facing away from the floating space.

[0027] And / or, the second adjusting member includes a second screw and a second nut, the second screw being threaded onto the floating mechanism, and the second nut being sleeved on the second screw and stopped on the side of the floating mechanism opposite to the floating space;

[0028] And / or, the third adjusting member includes a third screw and a third nut, the third screw being threaded onto the floating mechanism, and the third nut being fitted onto the third screw and stopping the floating mechanism on the side opposite to the floating space.

[0029] Secondly, a lead screw and nut mechanism is provided, including a transmission mechanism and a floating connection device as described above;

[0030] The transmission rod of the transmission mechanism is a lead screw, and the moving part of the transmission mechanism is a nut sleeved on the lead screw. The nut is at least partially movable within the floating space of the floating connection device.

[0031] Thirdly, a transmission device is provided, including a base plate, a drive mechanism, a load mechanism, and a lead screw and nut mechanism as described above;

[0032] The drive mechanism is mounted on the base plate and connected to the lead screw of the lead screw and nut mechanism. The drive mechanism is used to drive the lead screw to rotate. The floating mechanism is connected to the load mechanism.

[0033] The substrate is provided with a guide rail, and the load mechanism is provided with a slider, which slides in cooperation with the guide rail.

[0034] The beneficial effects of this utility model are:

[0035] The floating connection device provided by this utility model allows the moving part of the transmission mechanism to drive the load mechanism through a floating mechanism when the moving part moves along the transmission rod. By providing a floating space on the floating mechanism that movably engages with the moving part, a floating connection is formed between the floating mechanism and the transmission mechanism, thereby compensating for installation and dimensional errors in both the transmission and load mechanisms. By driving the first and second adjusting members closer to or further away from the moving part, the movable clearance of the moving part within the floating space can be adjusted, compensating for errors while limiting the range of motion of the moving part within the floating space. The third adjusting member can restrict the rotation of the moving part relative to the transmission rod by abutting against the limiting plane of the moving part. By driving the third adjusting member closer to or further away from the limiting plane of the moving part, the floating clearance between the third adjusting member and the moving part can be adjusted, achieving error compensation.

[0036] When the moving part drives the load mechanism to move in the first direction through the floating mechanism, the moving part abuts against the first adjusting part or the second adjusting part and is subjected to the reaction force given by the first adjusting part or the second adjusting part. Even if the force will cause torque to the transmission rod, the torque acting on the transmission rod can be greatly reduced because the distance between the first adjusting part and the second adjusting part and the transmission rod is short (i.e., the lever arm is short), thus extending the service life of the transmission mechanism.

[0037] The present invention provides a lead screw and nut mechanism and a transmission device including the lead screw and nut mechanism. The nut is connected to the load mechanism through a floating mechanism. By setting the connection between the nut and the floating mechanism as a floating connection, the friction and compression inside the lead screw and nut mechanism can be reduced or even eliminated while compensating for installation errors and dimensional errors, thus extending the service life of the lead screw and nut mechanism and improving the reliability and transmission accuracy of the transmission device. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0039] Figure 1 This is a first view of a lead screw and nut mechanism provided by the prior art;

[0040] Figure 2 This is a second view of a lead screw and nut mechanism provided by the prior art;

[0041] Figure 3 This is a first view of the transmission device provided in a specific embodiment of this utility model;

[0042] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0043] Figure 5 This is a partial view of the transmission device provided in a specific embodiment of this utility model;

[0044] Figure 6 This is a second view of the transmission device provided in a specific embodiment of this utility model;

[0045] Figure 7 yes Figure 6 A magnified view of a section at point B in the middle;

[0046] Figure 8 This is a third view of the transmission device provided in a specific embodiment of this utility model;

[0047] Figure 9 yes Figure 8 A magnified view of a section at point C.

[0048] Figure 1 and Figure 2 middle:

[0049] 1′ Load assembly; 2′ Linear guide rail; 3′ Fixed plate; 4′ Transmission nut; 5′ Transmission screw; 6′ Floating component;

[0050] 11′, socket; 61′, insert block.

[0051] Figures 3 to 9 middle:

[0052] 100. Transmission mechanism; 200. Loading mechanism; 300. Base plate; 400. Drive mechanism; 500. Guide rail; 600. Slider; 700. Coupling; 800. First base; 900. Second base;

[0053] 101. Transmission rod; 102. Moving part;

[0054] 1021. Fitting part; 1022. Flange part; 1023. Limiting plane;

[0055] 1. Floating mechanism; 2. First adjusting component; 3. Second adjusting component; 4. Third adjusting component; 5. First fastener; 6. Second fastener; 7. Positioning pin;

[0056] 11. Pressure plate; 12. Floating component; 10. Floating space;

[0057] 111. Clearance slot; 112. Block;

[0058] 121. First connecting plate; 122. Boss; 123. Second connecting plate;

[0059] 1211, perforation; 1221, card slot;

[0060] 21. First screw; 22. First nut;

[0061] 31. Second screw; 32. Second nut;

[0062] 41. Third screw; 42. Third nut. Detailed Implementation

[0063] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0064] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0067] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0068] In the embodiments of this utility model, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0069] Example 1

[0070] like Figure 3 , Figure 4 as well as Figure 5As shown, this embodiment provides a floating connection device for connecting a transmission mechanism 100 and a load mechanism 200. The transmission mechanism 100 includes a transmission rod 101 and a movable member 102 connected to the transmission rod 101. The movable member 102 can move along the axial direction of the transmission rod 101.

[0071] The floating connection device includes a floating mechanism 1 and a first adjusting member 2, a second adjusting member 3, and a third adjusting member 4 movably connected to the floating mechanism 1. The floating mechanism 1 is connected to the load mechanism 200 and is provided with a floating space 10, within which the moving member 102 is at least partially movable. Both the first adjusting member 2 and the second adjusting member 3 can move closer to or further away from the moving member 102 along a first direction, and the first adjusting member 2 and the second adjusting member 3 respectively abut against the moving member 102 on both sides along the first direction. The moving member 102 is provided with a limiting plane 1023, and the third adjusting member 4 can move closer to or further away from the limiting plane 1023 along a second direction. The first direction is the axial direction of the transmission rod 101, and the second direction is the radial direction of the transmission rod 101.

[0072] The floating connection device provided in this embodiment allows the moving part 102 of the transmission mechanism 100 to move along the transmission rod 101 when it moves. The moving part 102 then drives the load mechanism 200 to move via the floating mechanism 1. By providing a floating space 10 on the floating mechanism 1 that movably engages with the moving part 102, a floating connection is formed between the floating mechanism 1 and the transmission mechanism 100, thereby compensating for installation and dimensional errors in the transmission mechanism 100 and the load mechanism 200. By driving the first adjusting member 2 and the second adjusting member 3 closer to or further away from the moving part 102, the movable clearance of the moving part 102 within the floating space 10 can be adjusted, compensating for errors while limiting the range of motion of the moving part 102 within the floating space 10. The third adjusting member 4 can restrict the rotation of the moving part 102 relative to the transmission rod 101 by abutting against the limiting plane 1023 of the moving part 102. By driving the third adjusting member 4 closer to or further away from the limiting plane 1023 of the moving part 102, the floating clearance between the third adjusting member 4 and the moving part 102 can be adjusted, achieving error compensation.

[0073] When the moving part 102 drives the load mechanism 200 to move in the first direction through the floating mechanism 1, the moving part 102 abuts against the first adjusting part 2 or against the second adjusting part 3 and is subjected to the reaction force given by the first adjusting part 2 or the second adjusting part 3. Even if the force will cause torque to the transmission rod 101, the torque acting on the transmission rod 101 can be greatly reduced because the distance between the first adjusting part 2 and the second adjusting part 3 and the transmission rod 101 is short (i.e., the lever arm is short), thus extending the service life of the transmission mechanism 100.

[0074] In this embodiment, more specifically, the first direction and the second direction are both horizontal, the third direction is vertical, and the first direction, the second direction and the third direction are perpendicular to each other.

[0075] like Figure 5 , Figure 6 as well as Figure 7 As shown, the floating mechanism 1 includes a pressure plate 11 and a floating member 12. The pressure plate 11 is connected to the first end of the floating member 12 along a first direction, and the pressure plate 11 and the floating member 12 enclose a floating space 10. The second end of the floating member 12 is connected to the load mechanism 200. A first adjusting member 2 is movably connected to the floating member 12, and a second adjusting member 3 is movably connected to the pressure plate 11. When installing the floating mechanism 1, the pressure plate 11 and the floating member 12 are positioned on both sides of the moving member 102 along the first direction, and then the pressure plate 11 and the floating member 12 are brought together and connected to define the aforementioned floating space 10, which simplifies the assembly difficulty of the floating mechanism 1.

[0076] Of course, in other embodiments, the floating mechanism 1 can also be designed as an integral structure.

[0077] See Figure 5 and Figure 7 The moving part 102 includes a mating part 1021 and a flange part 1022 connected to the mating part 1021. The mating part 1021 is sleeved on the transmission rod 101 and engages with the transmission rod 101 in a transmission manner. The flange part 1022 is located in the floating space 10 and is provided with a limiting plane 1023. The floating part 12 includes a first connecting plate 121 and a boss 122 protruding from the first connecting plate 121. The first connecting plate 121 is provided with a through hole 1211 for the mating part 1021 to pass through. The pressure plate 11 is connected to the boss 122 and is spaced apart from the first connecting plate 121. The first connecting plate 121, the boss 122 and the pressure plate 11 enclose the aforementioned floating space 10. The pressure plate 11 is provided with a relief groove 111, and the transmission rod 101 enters the relief groove 111 in a second direction.

[0078] When installing the floating mechanism 1, position the pressure plate 11 on one side of the flange 1022 and position the transmission rod 101 within the clearance groove 111 to avoid interference between the pressure plate 11 and the transmission rod 101. Then, fit the first connecting plate 121 of the floating component 12 onto the mating portion 1021 of the moving component 102 through the through hole 1211, close to the flange 1022. Finally, connect the pressure plate 11 to the boss 122. It is understood that after installation, the distance between the pressure plate 11 and the first connecting plate 121 is greater than the thickness of the flange 1022, allowing the flange 1022 to move adaptively within the floating space 10 and compensate for errors during transmission.

[0079] Specifically, the first adjusting member 2 is connected to the first connecting plate 121, and the third adjusting member 4 is connected to the boss 122.

[0080] like Figure 7 As shown, one of the boss 122 and the pressure plate 11 is provided with a slot 1221, and the other of the boss 122 and the pressure plate 11 is engaged in the slot 1221; the floating connection device also includes a first fastener 5, and the pressure plate 11 is connected to the boss 122 through the first fastener 5. The boss 122 and the pressure plate 11 are engaged together through the slot 1221, which can play a positioning role during assembly, and can ensure stability after being tightened by the first fastener 5, reducing the relative movement between the pressure plate 11 and the floating part 12.

[0081] Specifically, in this embodiment, the boss 122 is provided with a slot 1221, and the end of the pressure plate 11 is provided with a locking block 112, which is engaged in the slot 1221. The first fastener 5 passes through the locking block 112 and connects to the boss 122, thereby fastening the pressure plate 11 to the floating member 12. Exemplarily, the first fastener 5 is a screw, and one or at least two screws may be provided.

[0082] like Figure 5 and Figure 7 As shown, the floating component 12 also includes a second connecting plate 123, which is attached and connected to the load mechanism 200 to achieve a fixed connection between the floating mechanism 1 and the load mechanism 200. The second connecting plate 123 and the boss 122 are located on both sides of the flange portion 1022 along the second direction, that is, the boss 122 is located on the side of the flange portion 1022 facing away from the load mechanism 200, which makes it more convenient to operate the third adjusting component 4. Moreover, the boss 122 does not obstruct the flange portion 1022 in the third direction, and the floating space 10 has an upward opening, making it easier to observe and operate during assembly and when adjusting the first adjusting component 2, the second adjusting component 3, and the third adjusting component 4.

[0083] like Figure 8 and Figure 9 As shown, the load mechanism 200 and the second connecting plate 123 are positioned by a locating pin 7 and fastened together by a second fastener 6. Exemplarily, the second fastener 6 is a screw, and one or at least two may be provided.

[0084] See Figure 4The first adjusting component 2 includes a first screw 21 and a first nut 22. The first screw 21 is screwed onto the floating mechanism 1, and the first nut 22 is fitted onto the first screw 21 and stops on the side of the floating mechanism 1 facing away from the floating space 10. Specifically, the first screw 21 is screwed onto the first connecting plate 121, and the first nut 22 stops on the side of the first connecting plate 121 facing away from the floating space 10. The position of the first screw 21 can be adjusted in the first direction by screwing it. After adjustment, the first nut 22 is pressed against the side of the first connecting plate 121 facing away from the floating space 10 to fix the position of the first screw 21.

[0085] See Figure 7 The second adjusting component 3 includes a second screw 31 and a second nut 32. The second screw 31 is screwed onto the floating mechanism 1, and the second nut 32 is fitted onto the second screw 31 and stops on the side of the floating mechanism 1 facing away from the floating space 10. Specifically, the second screw 31 is screwed onto the pressure plate 11, and the second nut 32 stops on the side of the pressure plate 11 facing away from the floating space 10. The position of the second screw 31 can be adjusted in the first direction by screwing it. After adjustment, the second nut 32 is pressed against the side of the pressure plate 11 facing away from the floating space 10 to fix the position of the second screw 31.

[0086] See Figure 5 The third adjusting component 4 includes a third screw 41 and a third nut 42. The third screw 41 is screwed onto the floating mechanism 1, and the third nut 42 is fitted onto the third screw 41 and stops on the side of the floating mechanism 1 facing away from the floating space 10. Specifically, the third screw 41 is screwed onto the boss 122, and the third nut 42 stops on the side of the boss 122 facing away from the floating space 10. The position of the third screw 41 can be adjusted in the second direction by screwing it. After adjustment, the third nut 42 is pressed against the side of the boss 122 facing away from the floating space 10 to fix the position of the third screw 41.

[0087] like Figure 4 and Figure 5 As shown, the first adjusting member 2 is provided in at least one set, each set including two first adjusting members 2 symmetrically distributed on both sides of the transmission rod 101; the second adjusting member 3 is provided in at least one set, each set including two second adjusting members 3 symmetrically distributed on both sides of the transmission rod 101.

[0088] When the moving part 102 moves to the right, it abuts against the first adjusting part 2; when the moving part 102 moves to the left, it abuts against the second adjusting part 3. During the movement, it is subjected to the reaction force given by the first adjusting part 2 or the second adjusting part 3. Since all the first adjusting parts 2 and all the second adjusting parts 3 are symmetrically distributed on both sides of the transmission rod 101, the torque of the moving part 102 on the transmission rod 101 is canceled out, and theoretically, the moving part 102 will not cause torque on the transmission rod 101. Even if the flange portion 1022 of the moving part 102 abuts against only one of the first adjusting parts 2 or only one of the second adjusting parts 3, the distance between the first adjusting part 2 and the second adjusting part 3 and the central axis of the transmission rod 101 is relatively short, resulting in a smaller torque acting on the transmission rod 101. In the prior art, the point of application of the reaction force is at the connection position between the load mechanism 200 and the floating member 12. This position is far from the central axis of the transmission rod 101, resulting in a long lever arm and a large torque on the transmission rod 101.

[0089] There are two third adjusting members 4. The two third adjusting members 4 are symmetrically arranged relative to the axis of the transmission rod 101. The two third adjusting members 4 can respectively limit the rotation angle of the moving member 102 in the clockwise and counterclockwise directions, so as to ensure accurate transmission and compensate for errors.

[0090] In this embodiment, two of each of the first adjusting member 2, the second adjusting member 3, and the third adjusting member 4 are provided. The two first adjusting members 2 and the two second adjusting members 3 are arranged facing each other in the first direction, so that the force points on both sides of the flange 1022 along the first direction are facing each other in the first direction, thus counteracting the deformation of the flange 1022 caused by the reaction forces of the first adjusting members 2 and the second adjusting members 3.

[0091] Example 2

[0092] This embodiment provides a lead screw and nut mechanism, including a transmission mechanism 100 and a floating connection device as described in Embodiment 1. The transmission rod 101 of the transmission mechanism 100 is a lead screw, and the moving part 102 of the transmission mechanism 100 is a nut sleeved on the lead screw. The nut is at least partially movable within the floating space 10 of the floating connection device. The nut is connected to the load mechanism 200 through the floating mechanism 1.

[0093] The screw is driven to rotate, causing the nut to move along the screw. The nut, through the floating mechanism 1, drives the load mechanism 200 to move in the first direction. In this embodiment, two of each of the first adjusting member 2 and the second adjusting member 3 are provided, and they are symmetrically distributed on both sides of the screw axis.

[0094] For example, during installation, first gently tighten the two second adjusting members 3 on the pressure plate 11 and the two first adjusting members 2 on the first connecting plate 121, so that the screws of all four adjusting members are in full contact with the side of the flange 1022. Then tighten the first nuts 22 on the two first screws 21 on the first connecting plate 121 to fix the position of the two first screws 21. After that, loosen the two second screws 31 on the pressure plate 11 by a certain angle so that a certain gap is formed between the two second screws 31 and the side of the flange 1022. Using a feeler gauge or other tools, try to make the gap between the two second screws 31 and the flange 1022 equal. For example, use a feeler gauge to adjust the gap between the two second screws 31 and the flange 1022 to 0.02mm.

[0095] When the nut moves to the right, it abuts against the first adjusting member 2; when the nut moves to the left, it abuts against the second adjusting member 3. During the movement, it receives a reaction force from either the first adjusting member 2 or the second adjusting member 3. Since the two first adjusting members 2 and the two second adjusting members 3 are symmetrically distributed on both sides of the lead screw, the torque of the nut on the lead screw cancels out, and theoretically, the nut will not cause torque on the lead screw. Even if the flange portion 1022 of the nut abuts against only one first adjusting member 2 or only one second adjusting member 3, the distance between the first adjusting member 2 and the second adjusting member 3 and the central axis of the lead screw is relatively short, resulting in a shorter lever arm L1 and thus a smaller torque acting on the lead screw.

[0096] In the prior art, the point of application of the reaction force is at the connection position between the load mechanism 200 and the floating member 12. This position is relatively far from the central axis of the lead screw, resulting in a long lever arm L2 and a large torque on the lead screw. For example, the lever arm L2 is 51 mm. After improvement using the floating connection device provided in this embodiment, the lever arm L1 is 20.5 mm, which is about 60% less than before the improvement, and can significantly reduce the torque acting on the lead screw.

[0097] Example 3

[0098] like Figure 3 and Figure 4 As shown, this embodiment provides a transmission device, including a base plate 300, a drive mechanism 400, a load mechanism 200, and a lead screw and nut mechanism as described in Embodiment 2.

[0099] A drive mechanism 400 is mounted on the base plate 300 and connected to the lead screw of the lead screw and nut mechanism. The drive mechanism 400 is used to drive the lead screw to rotate. The floating mechanism 1 is connected to the load mechanism 200. A guide rail 500 is provided on the base plate 300, and a slider 600 is provided on the load mechanism 200. The slider 600 is slidably engaged with the guide rail 500. The drive mechanism 400 is exemplarily a rotary motor. The housing of the rotary motor is mounted on the base plate 300. The output shaft of the rotary motor is connected to the lead screw through a coupling 700 to drive the lead screw to rotate, thereby causing the nut to drive the load mechanism 200 to move in a first direction through the floating mechanism 1. During the movement, the slider 600 slides along the guide rail 500. Further, a first seat 800 and a second seat 900 are provided on the base plate 300. One end of the lead screw is rotatably mounted on the first seat 800 through a first bearing, and the second end of the lead screw is rotatably mounted on the second seat 900 through a second bearing.

[0100] In the transmission device provided in this embodiment, the nut is connected to the load mechanism 200 through the floating mechanism 1. By setting the connection between the nut and the floating mechanism 1 as a floating connection, the friction and compression inside the screw nut mechanism can be reduced or even eliminated while compensating for installation errors and dimensional errors, thus extending the service life of the screw nut mechanism and improving the reliability and transmission accuracy of the transmission device.

[0101] Specifically, see Figure 8 Two guide rails 500 are spaced apart along a third direction on the substrate 300. Each guide rail 500 extends along a first direction and slides in cooperation with two sliders 600.

[0102] It should be noted that fixing the floating mechanism 1 to the load mechanism 200 increases the torque generated by the two guide rails 500. However, the installation distance between the two guide rails 500 is relatively large, and each guide rail 500 is equipped with two sliders 600 with increased spacing. Therefore, the torque they can withstand is very large, far exceeding the requirements of the load mechanism 200. Thus, increasing the torque will not affect their service life. However, the lead screw and nut mechanism is relatively weak. By reducing the torque and improving the stress distribution, its service life will be significantly increased.

[0103] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A floating connection device, characterized in that For connecting the transmission mechanism (100) and the load mechanism (200), the transmission mechanism (100) includes a transmission rod (101) and a movable member (102) connected to the transmission rod (101), the movable member (102) being movable along the axial direction of the transmission rod (101); The floating connection device includes a floating mechanism (1) and a first adjusting member (2), a second adjusting member (3) and a third adjusting member (4) movably connected to the floating mechanism (1); The floating mechanism (1) is connected to the load mechanism (200) and is provided with a floating space (10), wherein the moving part (102) is at least partially movable within the floating space (10); The first adjusting member (2) and the second adjusting member (3) can both move closer to or further away from the moving member (102) along the first direction. The first adjusting member (2) and the second adjusting member (3) respectively abut against the moving member (102) on both sides along the first direction. The moving member (102) is provided with a limiting plane (1023). The third adjusting member (4) can move closer to or further away from the limiting plane (1023) along the second direction. Wherein, the first direction is the axial direction of the transmission rod (101), and the second direction is the radial direction of the transmission rod (101).

2. The floating connection device according to claim 1, characterized in that, The floating mechanism (1) includes a pressure plate (11) and a floating component (12); The pressure plate (11) is connected to the first end of the floating member (12) along the first direction, the pressure plate (11) and the floating member (12) enclose the floating space (10), and the second end of the floating member (12) is connected to the load mechanism (200); The first adjusting member (2) is connected to the floating member (12), and the second adjusting member (3) is connected to the pressure plate (11).

3. The floating connection device according to claim 2, characterized in that, The moving part (102) includes a mating part (1021) and a flange part (1022) connected to the mating part (1021). The mating part (1021) is sleeved on the transmission rod (101). The flange part (1022) is located in the floating space (10) and is provided with the limiting plane (1023). The floating component (12) includes a first connecting plate (121) and a boss (122) protruding from the first connecting plate (121). The first connecting plate (121) is provided with a through hole (1211) for the mating part (1021) to pass through. The pressure plate (11) is connected to the boss (122). The first connecting plate (121), the boss (122) and the pressure plate (11) enclose the floating space (10). The pressure plate (11) is provided with a relief groove (111). The transmission rod (101) enters the relief groove (111) along the second direction. The first adjusting member (2) is connected to the first connecting plate (121), and the third adjusting member (4) is connected to the boss (122).

4. The floating connection device according to claim 3, characterized in that, One of the boss (122) and the pressure plate (11) is provided with a slot (1221), and the other of the boss (122) and the pressure plate (11) is engaged in the slot (1221); The floating connection device further includes a first fastener (5), and the pressure plate (11) is connected to the boss (122) through the first fastener (5).

5. The floating connection device according to claim 3, characterized in that, The floating component (12) further includes a second connecting plate (123), which is attached to and connected to the load mechanism (200); the second connecting plate (123) and the boss (122) are respectively located on both sides of the flange (1022) along the second direction.

6. The floating connection device according to any one of claims 1-5, characterized in that, The first adjusting member (2) is provided with at least one set, each set including two first adjusting members (2) symmetrically distributed on both sides of the transmission rod (101); And / or, the second adjusting member (3) is provided with at least one set, each set including two second adjusting members (3) symmetrically distributed on both sides of the transmission rod (101); And / or, there are two third adjustment members (4), and the two third adjustment members (4) are symmetrically arranged with respect to the axis of the transmission rod (101).

7. The floating connection device according to any one of claims 1-5, characterized in that, The first adjusting member (2) and the second adjusting member (3) are positioned opposite each other in the first direction.

8. The floating connection device according to any one of claims 1-5, characterized in that, The first adjusting member (2) includes a first screw (21) and a first nut (22). The first screw (21) is screwed into the floating mechanism (1), and the first nut (22) is sleeved on the first screw (21) and stops on the side of the floating mechanism (1) facing away from the floating space (10). And / or, the second adjusting member (3) includes a second screw (31) and a second nut (32), the second screw (31) being threaded onto the floating mechanism (1), and the second nut (32) being sleeved on the second screw (31) and stopping on the side of the floating mechanism (1) facing away from the floating space (10); And / or, the third adjusting member (4) includes a third screw (41) and a third nut (42), the third screw (41) being threaded onto the floating mechanism (1), and the third nut (42) being fitted onto the third screw (41) and stopping on the side of the floating mechanism (1) facing away from the floating space (10).

9. A lead screw and nut mechanism, characterized in that, Includes a transmission mechanism (100) and a floating connection device as described in any one of claims 1-8; The transmission rod (101) of the transmission mechanism (100) is a lead screw, and the moving part (102) of the transmission mechanism (100) is a nut sleeved on the lead screw. The nut is at least partially movable within the floating space (10) of the floating connection device.

10. A transmission device, characterized in that, It includes a base plate (300), a drive mechanism (400), a load mechanism (200), and a lead screw and nut mechanism as described in claim 9; The drive mechanism (400) is mounted on the base plate (300) and connected to the lead screw of the lead screw nut mechanism. The drive mechanism (400) is used to drive the lead screw to rotate. The floating mechanism (1) is connected to the load mechanism (200). A guide rail (500) is provided on the substrate (300), and a slider (600) is provided on the load mechanism (200), with the slider (600) slidingly engaged with the guide rail (500).

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