Lead screw nut anti-backlash device and electric equipment

Abstract

The utility model provides a lead screw nut anti-backlash device and electric equipment. The lead screw nut anti-backlash device comprises a motor, a lead screw is fixedly connected to an output shaft of the motor, two nuts with opposite thread directions are installed on the lead screw, a nut pipe of one nut is sleeved with a spring, the other end of the spring is pressed on the anti-backlash base, and nut heads of the two nuts are both located on the special-shaped transmission plate. And the special-shaped transmission plate penetrates through the nut pipe of the other nut and is connected with the clearance eliminating seat. The device is simple in structure and scientific in design, transmission stability is guaranteed, transmission efficiency is improved, and the problem of inaccurate repeated positioning is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical drive technical field, especially a screw rod nut anti backlash device and electric equipment. BACKGROUND

[0002] The main function of the screw rod nut pair is to convert rotary motion into linear motion, which has the advantages of simple structure and reliable transmission. Usually, due to machining and wear during actual use, there is a return gap between the external thread of the screw rod and the internal thread of the nut in the screw rod nut pair, and with the increase of the wear amount, the gap increases, which leads to unstable transmission and inaccurate repeated positioning. Therefore, it is particularly important to develop a screw rod nut anti backlash device and electric equipment. SUMMARY

[0003] The utility model solves the technical problems of overcoming the above-mentioned defects of prior art, and provides a screw rod nut anti backlash device and electric equipment. The screw rod nut anti backlash device has simple structure and scientific design, ensures the stability of transmission, improves the efficiency of transmission, and effectively solves the problem of inaccurate repeated positioning.

[0004] The utility model is implemented through the following technical solutions:

[0005] The utility model provides a screw rod nut anti backlash device in the first aspect, including motor, the output shaft of motor is fixedly connected with screw rod, the screw rod is installed with two nuts of opposite screw thread direction, the nut pipe of one nut is equipped with spring, the other end of spring is pressed on the anti backlash seat, the nut head of two nuts is located on the special-shaped transmission plate, the special-shaped transmission plate passes through the nut pipe of another nut and is connected with the anti backlash seat.

[0006] In this way, the two nuts are both square nuts.

[0007] In this way, a preset distance is provided between the two nuts.

[0008] In this way, the spring is a compression spring.

[0009] In this way, the special-shaped transmission plate is in the shape of inverted F, which includes a vertical plate and a first horizontal plate and a second horizontal plate, the vertical plate includes a first vertical plate and a second vertical plate, the first vertical plate is provided with a clamping hole for clamping the nut, and the second vertical plate is provided with a connecting hole.

[0010] In this way, the first horizontal plate is provided with a first mounting hole, and the second horizontal plate is provided with a second mounting hole.

[0011] In this way, the anti backlash seat is provided with a stepped hole, a third mounting hole and a fourth mounting hole, the third mounting hole is matched with the first mounting hole, and the fourth mounting hole is matched with the second mounting hole.

[0012] Thus, the stepped hole comprises a front large hole, a circular boss and a rear small hole.

[0013] Thus, the special-shaped transmission plate is an integral structure.

[0014] The second aspect of the utility model provides a kind of electric equipment, comprising the screw rod nut clearance compensation device of above-mentioned first aspect.

[0015] The utility model has the advantages of:

[0016] The utility model provides a kind of screw rod nut clearance compensation device and electric equipment, screw rod nut clearance compensation device includes motor, the output shaft of motor is fixedly connected with screw rod, two nuts of opposite screw direction are installed on screw rod, spring is sleeved on the nut pipe of one nut of which, the other end of spring is pressed on clearance compensation seat, the nut head of two nuts is located on special-shaped transmission plate, special-shaped transmission plate passes through the nut pipe of another nut, and is connected with clearance compensation seat.The utility model structure is simple, and design science is guaranteed the stability of transmission, improves the efficiency of transmission, effectively solves the problem of inaccurate repeated positioning. DRAWINGS

[0017] The utility model will be further described in connection with the drawings as follows:

[0018] Figure 1 It is the three-dimensional structure schematic view of a kind of screw rod nut clearance compensation device of some embodiments of the utility model;

[0019] Figure 2 It is the three-dimensional structure schematic view of a kind of screw rod nut clearance compensation device of some embodiments of the utility model without clearance compensation seat;

[0020] Figure 3 It is the three-dimensional structure schematic view of the position relationship of two nuts of opposite screw direction installed on screw rod of some embodiments of the utility model screw rod nut clearance compensation device;

[0021] Figure 4 It is the front view structure schematic view of Figure 3 ;

[0022] Figure 5 It is the three-dimensional structure schematic view of special-shaped transmission plate in some embodiments of the utility model;

[0023] Figure 6 It is the front view structure schematic view of Figure 1 ;

[0024] Figure 7 It is the three-dimensional structure schematic view of another angle in Figure 5 ;

[0025] Figure 8is a three-dimensional structure schematic view of the anti-backlash seat of some embodiments of the utility model;

[0026] Figure 9 is Figure 8 a side view structure schematic view;

[0027] Figure 10 is Figure 9 a cross-sectional structure schematic view of A-A direction in it.

[0028] In the drawing: 1 is screw rod, 2 is anti-backlash seat, 2.1 is front big hole, 2.2 is round boss, 2.3 is rear small hole, 2.4 is third mounting hole, 2.5 is fourth mounting hole, 3 is spring, 4 is nut, 5 is special-shaped transmission plate, 5.1 is first horizontal plate, 5.2 is first mounting hole, 5.3 is first vertical plate, 5.4 is clamping hole, 5.5 is second vertical plate, 5.6 is connecting hole, 5.7 is second horizontal plate, 5.8 is second mounting hole, 6 is motor. DETAILED DESCRIPTION

[0029] The application will be described in further detail below with reference to the drawings and embodiments. It is particularly pointed out that the following embodiments are only for illustrating the application, but do not limit the scope of the application. Similarly, the following embodiments are only some embodiments of the application, but not all embodiments of the application, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0030] The terms "first", "second", "third" in the application are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0031] The terms "mounting", "connected", "connection", "fixed", and the like, in the present application should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments to one another. It is explicitly contemplated that embodiments described herein can be combined with other embodiments.

[0033] Please refer to Figures 1-4 , Figure 1 is a three-dimensional structural schematic view of a screw nut anti-backlash device of some embodiments of the utility model; Figure 2 is a three-dimensional structural schematic view of a screw nut anti-backlash device without an anti-backlash seat of some embodiments of the utility model; Figure 3 is a three-dimensional structural schematic view of the position relationship of two nuts with opposite screw thread directions installed on a screw rod of a screw nut anti-backlash device of some embodiments of the utility model; Figure 4 is Figure 3 a front view structural schematic view; a screw nut anti-backlash device, comprising a motor 6, a screw rod 1 fixedly connected to the output shaft of the motor 6, characterized in that: two nuts 4 with opposite screw thread directions are installed on the screw rod 1, a spring 3 is sleeved on the nut tube of one of the nuts 4, the other end of the spring 3 is pressed on an anti-backlash seat 2, the nut heads of the two nuts 4 are both located on a special-shaped transmission plate 5, the special-shaped transmission plate 5 passes through the nut tube of the other nut 4 and is connected with the anti-backlash seat 2. In this way, when the nuts move repeatedly along the screw rod, the axial gap between the screw rod and the nuts is offset by the pre-tightening force of the spring, so that positioning errors caused by the fitting gap between the screw rod and the nuts during repeated movement are avoided, more idle strokes during movement are avoided, the stability of transmission is ensured, the efficiency of transmission is improved, and the problem of inaccurate repeated positioning is effectively solved. In addition, by installing two nuts with opposite screw thread directions on the screw rod, the problem of jumping or even jamming of the nut sleeved with the spring during operation is effectively solved.

[0034] Please refer to Figure 3 , Figure 3This is a three-dimensional structural diagram showing the positional relationship of two nuts with opposite thread directions mounted on the lead screw of the lead screw and nut backlash elimination device according to some embodiments of this utility model; both nuts 4 are square nuts. This design facilitates the mounting of the nut heads of the two nuts onto the irregularly shaped transmission plate.

[0035] Please see Figure 4 , Figure 4 yes Figure 3 The main structural diagram shows a preset distance between the two nuts 4. This design facilitates the application of a certain preload force by the spring.

[0036] Please see Figures 2-3 , Figure 2 This is a three-dimensional structural schematic diagram of a screw nut backlash elimination device for removing backlash elimination seats according to some embodiments of this utility model; Figure 3 This is a three-dimensional structural schematic diagram of the positional relationship of two nuts with opposite thread directions installed on the lead screw of the lead screw and nut backlash elimination device according to some embodiments of this utility model; spring 3 is a compression spring.

[0037] Please see Figures 5-7 , Figure 5 This is a three-dimensional structural diagram of the irregularly shaped transmission plate in some embodiments of this utility model. Figure 6 yes Figure 1 Front view structural diagram; Figure 7 yes Figure 5 A three-dimensional structural diagram from another angle; the irregularly shaped transmission plate 5 has an inverted F-shaped structure, including a vertical plate, a first horizontal plate 5.1, and a second horizontal plate 5.7. The vertical plate includes a first vertical plate 5.3 and a second vertical plate 5.5. The first vertical plate 5.3 has a snap-fit ​​hole 5.4 for snapping the nut 4, and the second vertical plate 5.5 has a connecting hole 5.6. This design, by setting the first horizontal plate and the second horizontal plate, facilitates snapping the nut heads of two nuts onto the irregularly shaped transmission plate; by opening the snap-fit ​​hole on the first vertical plate, it is convenient to pass the irregularly shaped transmission plate through the nut tube of another nut to snap the other nut; by opening the connecting hole on the second vertical plate, it is convenient to install the component to be transmitted.

[0038] Please see Figure 5 , Figure 5 This is a three-dimensional structural diagram of the irregularly shaped transmission plate in some embodiments of this utility model; a first mounting hole 5.2 is opened on the first transverse plate 5.1, and a second mounting hole 5.8 is opened on the second transverse plate 5.7. This design facilitates processing and installation, and achieves better results.

[0039] Please see Figures 8-9 , Figure 8 This is a three-dimensional structural schematic diagram of the gap-eliminating seat according to some embodiments of the present utility model; Figure 9 yes Figure 8The side view structural schematic diagram of the anti-backlash seat 2; the anti-backlash seat 2 is provided with a stepped hole, a third mounting hole 2.4 and a fourth mounting hole 2.5, the third mounting hole 2.4 is matched with the first mounting hole 5.2, and the fourth mounting hole 2.5 is matched with the second mounting hole 5.8.

[0040] Referring to Figures 8-10 , Figure 8 The three-dimensional structural schematic diagram of the anti-backlash seat in some embodiments of the utility model; Figure 9 The side view structural schematic diagram of the anti-backlash seat 2; Figure 8 The side view structural schematic diagram of the anti-backlash seat 2; Figure 10 The sectional view structural schematic diagram of the anti-backlash seat 2 in the direction of A-A; the stepped hole comprises a front large hole 2.1, a circular boss 2.2 and a rear small hole 2.3. Figure 9 Referring to

[0041] , Figures 5-7 The three-dimensional structural schematic diagram of the special-shaped transmission plate in some embodiments of the utility model; Figure 5 The front view structural schematic diagram of the special-shaped transmission plate 5; Figure 6 The three-dimensional structural schematic diagram of the special-shaped transmission plate 5 from another angle; Figure 1 The front view structural schematic diagram of the special-shaped transmission plate 5; Figure 7 The three-dimensional structural schematic diagram of the special-shaped transmission plate 5 from another angle; Figure 5 The special-shaped transmission plate 5 is an integral molding structure.

[0042] An electric device comprises the above-mentioned screw nut anti-backlash device.

[0043] Different from the prior art, the application provides a screw nut anti-backlash device and an electric device. The screw nut anti-backlash device comprises a motor, a screw rod fixedly connected to an output shaft of the motor, two nuts with opposite screw directions, a spring sleeved on a nut tube of one of the nuts, the other end of the spring being pressed on an anti-backlash seat, nut heads of the two nuts being located on a special-shaped transmission plate, the special-shaped transmission plate passing through a nut tube of the other nut and being connected to the anti-backlash seat. The utility model has the advantages of simple structure and scientific design, the axial gap between the screw rod and the nut being offset by the pre-tightening force of the spring when the nut repeatedly moves along the screw rod, the positioning error caused by the fitting gap between the screw rod and the nut being avoided in the repeated movement of the nut, more idle strokes being avoided in the movement, the stability of transmission being ensured, the efficiency of transmission being improved, and the problem of inaccurate repeated positioning being effectively solved. In addition, the two nuts with opposite screw directions are installed on the screw rod, the problem of jumping or even jamming of the nut sleeved with the spring in the movement being effectively solved.

[0044] The above description shows the main features, basic principles, and advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments or examples, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, the above embodiments or examples should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved. Any simple modification, equivalent change, and modification of the above embodiments according to the technical essence of the present application without departing from the technical principles of the present application should fall within the scope of the patent protection of the present application.

Claims

1. A screw nut anti-backlash device, comprising a motor, a screw is fixedly connected to an output shaft of the motor, characterized in that: The screw rod is provided with two nuts with opposite screw directions, one nut is provided with a spring on the nut tube, the other end of the spring is pressed on the anti-backlash seat, the nut heads of the two nuts are located on the special-shaped transmission plate, the special-shaped transmission plate passes through the nut tube of the other nut and is connected with the anti-backlash seat.

2. A lead screw and nut anti-backlash device as claimed in claim 1, wherein: The two nuts are square nuts.

3. A lead screw and nut anti-backlash device as claimed in claim 2, wherein: The two nuts are provided with a preset distance.

4. The anti-backlash device for a ball screw as set forth in claim 1, wherein: The spring is a compression spring.

5. A lead screw and nut anti-backlash device as claimed in claim 1, wherein: The special-shaped transmission plate is in an inverted F-shaped structure, which comprises vertical plates and first and second horizontal plates, the vertical plates comprise first and second vertical plates, the first vertical plate is provided with a clamping hole for clamping the nut, and the second vertical plate is provided with a connecting hole.

6. A lead screw and nut anti-backlash device as claimed in claim 5, wherein: The first horizontal plate is provided with a first mounting hole, and the second horizontal plate is provided with a second mounting hole.

7. A lead screw and nut anti-backlash device as claimed in claim 6, wherein: The anti-backlash seat is provided with a stepped hole, a third mounting hole and a fourth mounting hole, the third mounting hole is matched with the first mounting hole, and the fourth mounting hole is matched with the second mounting hole.

8. A lead screw and nut anti-backlash device as claimed in claim 7, wherein: The stepped hole comprises a front large hole, a circular boss and a rear small hole.

9. A lead screw and nut anti-backlash device as claimed in claim 5, wherein: The special-shaped transmission plate is in an integrated structure.

10. An electrically powered device, characterized by: A screw rod nut anti-backlash device comprising the screw rod nut anti-backlash device according to any one of claims 1-9.

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