Ball screw pair structure capable of improving positioning precision

Abstract

The utility model relates to the technical field of ball screw pairs, in particular to a ball screw pair structure capable of improving positioning accuracy, which comprises a clamping seat, a screw rod and a nut, a bearing used for supporting the screw rod is arranged on the clamping seat, a positioning groove used for placing the bearing is arranged on the clamping seat, a cavity communicated with the positioning groove is arranged on the clamping seat, and the nut is arranged in the cavity. A sleeve and a guide rod are fixedly installed on the clamping base, and a movable rod is slidably arranged in the sleeve in a sleeved mode. According to the utility model, the two clamping plates are arranged on the clamping seat, so that the two clamping plates can clamp the bearing from two side positions, and the stability of the bearing in the clamping seat can be ensured; the two racks are driven by the motor to pull the sliding block when moving reversely, the sliding block pulls the connecting rod when moving reversely, the pressing plate can be pulled oppositely by the position difference generated when the connecting rod deflects, the pressing plate drives the moving rod to slide in the sleeve, and then the bearing can be rapidly positioned in the support.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screw pairs, in particular to a ball screw pair structure capable of improving positioning accuracy. Background Art

[0002] The ball screw pair is composed of a screw and a nut. It can convert rotational motion into linear motion, or convert linear motion into rotational motion. Therefore, the ball screw pair is both a transmission element and a component for converting linear motion into rotational motion.

[0003] When assembling the ball screw pair, a support plate is used to support the screw, and a bearing is set on the support plate to support one end of the screw. Currently, a slot is provided on the support plate to place the bearing. The screw will vibrate during operation, and the support plate only positions the bearing through the slot, so that the contact area between the bearing and the support plate is small. This causes the bearing to vibrate synchronously when the screw is running, and the stability of the screw in the holder cannot be guaranteed. When the bearing vibrates, it will rub and collide with the support plate, causing the positioning accuracy of the nut to be affected when the screw moves. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the bearing has a small contact area with the support plate when supporting the screw rod, which leads to vibration, and proposes a ball screw pair structure that can improve the positioning accuracy.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A ball screw pair structure capable of improving positioning accuracy comprises a cartridge, a lead screw and a nut, wherein the cartridge is provided with a bearing for supporting the lead screw, and a positioning groove for placing the bearing is provided on the cartridge, a cavity connected to the positioning groove is provided on the cartridge, a sleeve and a guide rod are fixedly mounted on the cartridge, and a moving rod is slidably sleeved in the sleeve, a clamping plate corresponding to the bearing is fixedly mounted on the moving rod, a spring is welded between the moving rod and the sleeve, and a driving component for driving the moving rod is installed on the guide rod.

[0007] Preferably, the clamping plate and the moving rod extend to one side of the cavity, and the clamping plate is vertically arranged on both sides of the bearing, and the spring is horizontally welded to one side of the moving rod extending into the sleeve.

[0008] Preferably, the sleeve is horizontally arranged on both sides of the base, the guide rod is vertically arranged on one side of the base, the card plate is an arc-shaped structure adapted to the bearing, and an anti-slip pad is integrally connected to the card plate and resists against the bearing.

[0009] Preferably, the driving assembly includes two sliders slidably sleeved on the guide rod, the sliding sleeve on the clamping seat is provided with a pressure plate connected to the moving rod, and a connecting rod is connected between the pressure plate and the two sliders, and the clamping seat is connected to a ring sleeve for intercepting the bearing by screws.

[0010] Preferably, a long hole for guiding the pressure plate is provided on the holder, and two ends of the connecting rod are respectively connected to the pressure plate and the slider pin.

[0011] Preferably, a rack is fixedly mounted on the slider, a motor is fixedly mounted on the holder, and a rotating shaft transmission-connected to the two racks is fixedly connected to the motor output end, the rotating shaft is horizontally arranged, and a gear meshingly connected to the two racks is fixedly mounted on the rotating shaft.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model provides two clamping plates on the clamping seat so that the two clamping plates can clamp the bearing from two sides, and provides anti-skid pads on the clamping plates so that the bearing can ensure its own stability in the clamping seat.

[0014] 2. The utility model drives the two racks through the motor to pull the slider when they move in the opposite direction, and the slider pulls the connecting rod when they move in the opposite direction. The position difference generated when the connecting rod is deflected can pull the pressure plate toward each other, so that the pressure plate drives the moving rod to slide in the sleeve, and then the bearing can be quickly positioned in the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a ball screw pair structure that can improve positioning accuracy proposed by the utility model;

[0016] Figure 2 This is a rear view of a ball screw pair structure that can improve positioning accuracy proposed by the utility model;

[0017] Figure 3 The utility model is a cross-sectional view of a ball screw pair structure which can improve positioning accuracy.

[0018] In the figure: 1. holder; 2. bearing; 3. screw rod; 4. nut; 5. sleeve; 6. moving rod; 7. spring; 8. clamping plate; 9. anti-slip pad; 10. guide rod; 11. slider; 12. pressure plate; 13. connecting rod; 14. motor; 15. rotating shaft; 16. gear; 17. rack; 18. ring sleeve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1-Figure 3 A ball screw pair structure capable of improving positioning accuracy comprises a holder 1, a screw rod 3, and a nut 4. The holder 1 is provided with a bearing 2 for supporting the screw rod 3, and the holder 1 is provided with a positioning groove for placing the bearing 2;

[0021] The card base 1 is provided with a cavity connected with the positioning groove, the card base 1 is fixedly installed with a sleeve 5 and a guide rod 10, and a moving rod 6 is slidably sleeved in the sleeve 5, and a clamping plate 8 corresponding to the bearing 2 is fixedly installed on the moving rod 6, and a spring 7 is welded between the moving rod 6 and the sleeve 5. The sleeve 5 guides the moving rod 6 so that the moving rod 6 can smoothly pull the clamping plate 8 when moving, and the spring 7 buffers the moving rod 6 to prevent the moving rod 6 from exerting excessive pressure on the sleeve 5.

[0022] The card plate 8 and the moving rod 6 extend to one side of the cavity, and the card plate 8 is vertically arranged at the two sides of the bearing 2, the spring 7 is horizontally welded to the one side of the moving rod 6 extending to the sleeve 5, the sleeve 5 is horizontally arranged at the two sides of the card seat 1, and the guide rod 10 is vertically arranged at one side of the card seat 1. The card plate 8 is an arc-shaped structure adapted to the bearing 2, and the card plate 8 is integrally connected with an anti-skid pad 9 that is movably against the bearing 2. By setting the card plate 8 as an arc-shaped structure adapted to the bearing 2, the contact area between the card plate 8 and the bearing 2 is increased, and by arranging the anti-skid pad 9 on the card plate 8, the friction coefficient between the card plate 8 and the bearing 2 is increased;

[0023] A driving assembly for driving the moving rod 6 is installed on the guide rod 10;

[0024] The driving assembly includes two sliders 11 slidably sleeved on the guide rod 10, a pressure plate 12 connected to the moving rod 6 is slidably sleeved on the base 1, and a connecting rod 13 is connected between the pressure plate 12 and the two sliders 11, and the guide rod 10 guides the sliders 11 so that the sliders 11 can smoothly pull the connecting rod 13 when moving;

[0025] The base 1 is provided with a long hole for guiding the pressure plate 12, and the two ends of the connecting rod 13 are respectively connected with the pressure plate 12 and the slider 11 by pins. The base 1 is connected with a ring sleeve 18 for intercepting the bearing 2 by screws. The long hole guides the pressure plate 12, so that the pressure plate 12 can smoothly pull the connecting rod 13 when moving.

[0026] A rack 17 is fixedly mounted on the slider 11, a motor 14 is fixedly mounted on the holder 1, and a rotating shaft 15 which is transmission-connected to the two racks 17 is fixedly connected to the output end of the motor 14. After the motor 14 is powered on, it can drive the rotating shaft 15 to rotate. This technical solution is a prior art and will not be elaborated on here. The rotating shaft 15 is horizontally arranged, and a gear 16 which is meshingly connected to the two racks 17 is fixedly mounted on the rotating shaft 15;

[0027] The output end of the motor 14 drives the rotating shaft 15 to rotate, so that the two sliders 11 drive the connecting rod 13 to deflect when moving in the opposite direction, and the connecting rod 13 drives the two pressure plates 12 to move toward each other when deflecting. When the pressure plate 12 moves, it drives the moving rod 6 and the clamping plate 8 to move toward each other, so that the clamping plate 8 limits the bearing 2 from both sides, thereby increasing the contact degree between the clamping plate 8 and the bearing 2, so that the bearing 2 can ensure the contact degree between the clamping seat 1 and the bearing 2 when supporting the screw rod 3, thereby ensuring the positioning accuracy of the nut 4 on the screw rod 3.

[0028] The functional principle of the utility model can be explained through the following operation modes:

[0029] Install the nut 4 on the screw rod 3, extend the bearing 2 into the holder 1 through the positioning groove, and extend one end of the screw rod 3 into the bearing 2;

[0030] The output end of the motor 14 drives the rotating shaft 15 to rotate, and the rotating shaft 15 drives the gear 16 to pull the two meshing racks 17, so that the racks 17 drive the two sliders 11 to move toward or in the opposite direction;

[0031] When the two sliders 11 slide in opposite directions on the guide rod 10, the connecting rod 13 is pulled. The position difference generated when the connecting rod 13 is deflected can pull the pressure plate 12, so that the pressure plate 12 drives the moving rod 6 to slide in the sleeve 5 when sliding in the long hole. The spring 7 is stressed, so that the moving rod 6 drives the clamping plate 8 and the anti-skid pad 9 to slide in the cavity, extend to the bearing 2, and clamp the bearing 2;

[0032] The ring sleeve 18 is extended to the base 1 , and the ring sleeve 18 and the base 1 are connected by screws.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ball screw pair structure capable of improving positioning accuracy, comprising a holder (1), a screw rod (3), and a nut (4), wherein the holder (1) is provided with a bearing (2) for supporting the screw rod (3), and a positioning groove for placing the bearing (2) is provided on the holder (1), characterized in that: The base (1) is provided with a cavity connected to the positioning groove, a sleeve (5) and a guide rod (10) are fixedly mounted on the base (1), a moving rod (6) is slidably sleeved in the sleeve (5), a clamping plate (8) corresponding to the bearing (2) is fixedly mounted on the moving rod (6), a spring (7) is welded between the moving rod (6) and the sleeve (5), and a driving component for driving the moving rod (6) is mounted on the guide rod (10).

2. A ball screw pair structure capable of improving positioning accuracy according to claim 1, characterized in that: The clamping plate (8) and the moving rod (6) extend to one side of the cavity, and the clamping plate (8) is vertically arranged on both sides of the bearing (2), and the spring (7) is horizontally welded to the moving rod (6) extending to one side of the sleeve (5).

3. A ball screw pair structure capable of improving positioning accuracy according to claim 1, characterized in that: The sleeve (5) is horizontally arranged at two sides of the card seat (1), the guide rod (10) is vertically arranged at one side of the card seat (1), the card plate (8) is an arc-shaped structure adapted to the bearing (2), and an anti-slip pad (9) is integrally connected to the card plate (8) and is movably opposed to the bearing (2).

4. A ball screw pair structure capable of improving positioning accuracy according to claim 1, characterized in that: The driving assembly comprises two sliders (11) slidably sleeved on a guide rod (10); a pressure plate (12) connected to a moving rod (6) is slidably sleeved on the clamping seat (1); a connecting rod (13) is connected between the pressure plate (12) and the two sliders (11); and the clamping seat (1) is connected to a ring sleeve (18) for intercepting a bearing (2) via screws.

5. A ball screw pair structure capable of improving positioning accuracy according to claim 4, characterized in that: The base (1) is provided with a long hole for guiding the pressure plate (12), and the two ends of the connecting rod (13) are respectively connected to the pressure plate (12) and the slider (11) by pins.

6. A ball screw pair structure capable of improving positioning accuracy according to claim 4, characterized in that: A rack (17) is fixedly mounted on the slider (11), a motor (14) is fixedly mounted on the holder (1), and a rotating shaft (15) which is transmission-connected to the two racks (17) is fixedly connected to the output end of the motor (14), the rotating shaft (15) is arranged horizontally, and a gear (16) which is meshingly connected to the two racks (17) is fixedly mounted on the rotating shaft (15).

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