High-precision ball screw pair pre-tightening structure

Abstract

The utility model discloses a high-precision ball screw pair pre-tightening structure, which relates to the technical field of ball screw pair pre-tightening structures, and comprises a fixed seat, one side of the top end of the fixed seat is fixedly connected with a fixed end, one side of the fixed end is fixedly connected with an adjusting assembly, one end of the adjusting assembly is fixedly connected with a fixed screw, and the other end of the adjusting assembly is fixedly connected with a movable screw. The surface of the fixing lead screw is in threaded connection with a ball pre-tightening assembly, and one end of the fixing lead screw is fixedly connected with a bearing. According to the utility model, through the arrangement of the adjusting assembly, when the device is operated and used by personnel, the operation condition of equipment is changed or new requirements on transmission precision exist, the servo motor can be started through an external power supply, the servo motor accurately rotates according to an instruction, and the fixed lead screw is driven to rotate through the transmission rod and the coupler, so that the nut seat generates axial displacement; and in cooperation with fine adjustment of the fixing nut, the pre-tightening force can be rapidly and accurately adjusted within a large range, and therefore adjustment can be automatically and rapidly conducted.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball screw pair pre -tightening structure technical field, specifically to a high -precision ball screw pair pre -tightening structure. BACKGROUND

[0002] In the field of mechanical transmission, ball screw pairs are widely used in devices requiring high-precision linear motion conversion or positioning, such as numerical control machine tools, precision measuring instruments, industrial robots, etc. However, the ball screw pair has an axial gap during use, which can cause transmission accuracy to decrease, system stiffness to be insufficient, and problems such as dead stroke and error to occur during reverse motion. Although the traditional ball screw pair pre -tightening structure can solve these problems to some extent, it still has many deficiencies, and therefore, there is an urgent need for a high -precision ball screw pair pre -tightening structure that can flexibly adjust the pre -tightening force and has a stable and reliable structure.

[0003] The existing ball screw pair pre -tightening structure has the following problems:

[0004] (1) The pre -tightening force adjustment flexibility is poor, and the pre -tightening force size cannot be quickly and accurately adjusted according to different working scenes, resulting in limited transmission accuracy and difficulty in meeting high -precision machining and positioning requirements;

[0005] (2) The structure design is poor, either too complex resulting in high cost and prone to failure, or simple but unable to guarantee the long -term stability of the pre -tightening force, affecting the overall performance and service life of the ball screw pair.

[0006] In view of the above problems, the utility model provides a high -precision ball screw pair pre -tightening structure. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a high -precision ball screw pair pre -tightening structure, which can flexibly and accurately adjust the pre -tightening force and has a stable and reliable structure, thereby solving the problems in the background art.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a high -precision ball screw pair pre -tightening structure, comprising a fixed seat, one side of the top end of the fixed seat is fixedly connected with a fixed end, one side of the fixed end is fixedly connected with an adjusting assembly, one end of the adjusting assembly is fixedly connected with a fixed screw, the surface of the fixed screw is threadedly connected with a ball pre -tightening assembly, and one end of the fixed screw is fixedly connected with a bearing.

[0009] Further, one end of the bearing is fixedly connected with a support end, the bottom end of the support end is fixedly connected to the other side of the top end of the fixed seat, so as to stably support the fixed screw, reduce its shaking and deviation during rotation, and ensure the stability of the ball screw pair transmission.

[0010] Further, the adjusting assembly comprises a motor box fixedly connected to one side of the fixed end, and a servo motor is fixedly connected in the motor box, so that the high-precision control characteristics of the servo motor are utilized to provide an accurate power source for the pre-tightening force adjustment, and the rotating angle and speed of the output shaft can be accurately changed according to the instruction.

[0011] Further, the output end of the servo motor is spline-connected with a transmission rod, and a shaft coupling is fixedly connected to one end of the transmission rod, so that the servo motor power is stably and efficiently transmitted to the fixed screw rod, the spline connection ensures the transmission accuracy and stability, and the shaft coupling compensates the installation error and axial displacement.

[0012] Further, the ball pre-tightening assembly comprises a nut seat screw-connected to the surface of the fixed screw rod, and the inner wall of the nut seat is slidingly connected with sliding balls matched with the fixed screw rod, so that the friction is reduced through the rolling of the balls, efficient transmission between the fixed screw rod and the nut seat is realized, and the basic structure for pre-tightening is provided.

[0013] Further, one side of the nut seat is screw-connected with a fixed nut, and the fixed nut is screw-connected to the surface of the fixed screw rod, so that the position of the nut seat on the fixed screw rod is changed by rotating the fixed nut, the contact pressure between the balls and the fixed screw rod and the nut seat is accurately adjusted, and the pre-tightening force adjustment is realized.

[0014] Further, a circulation channel matched with the sliding balls is arranged in the nut seat, and the circulation channel is used for guiding the sliding balls to circulate and roll in the nut seat, so that the smooth movement of the balls is ensured, the wear is reduced, and the service life of the ball screw pair is prolonged.

[0015] Compared with the prior art, the high-precision ball screw pair pre-tightening structure has the following beneficial effects:

[0016] The high-precision ball screw pair pre-tightening structure has the following beneficial effects:

[0017] (1) Through the adjustment assembly, when the personnel operating device is used, when the equipment operating condition changes or new requirements for transmission accuracy are required, the servo motor can be started through an external power supply, the servo motor rotates accurately according to the instruction, the fixed screw rod is driven to rotate through the transmission rod and the shaft coupling, the nut seat is axially displaced, and the fixed nut is finely adjusted, so that the pre-tightening force can be quickly and accurately adjusted in a large range, and the adjustment is automatically and quickly performed.

[0018] (2) Through the ball pre-tightening assembly, when the personnel operating device is used, the circulation channel in the nut seat ensures the smooth circulation of the balls, reduces the wear, and maintains good transmission performance for a long time, the pre-tightening force adjustment mode realized by the cooperation of the fixed nut and the nut seat is simple and effective, the structure is stable and reliable, the pre-tightening force fluctuation is small during long-term use, and the rigidity of the ball screw pair system can be effectively guaranteed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device of this utility model;

[0020] Figure 2 This is a schematic diagram of the fixing base structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the ball preload assembly of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the motor box of this utility model;

[0023] Figure 5 This is an enlarged schematic diagram of part A of this utility model.

[0024] In the diagram: 1. Fixed base; 2. Fixed end; 3. Adjustment assembly; 301. Motor box; 302. Servo motor; 303. Transmission rod; 304. Coupling; 4. Fixed lead screw; 5. Ball preload assembly; 501. Nut seat; 502. Sliding ball; 503. Fixed nut; 6. Bearing; 7. Support end. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To solve the problem of how to effectively position and adjust the technology, such as Figures 1-5 As shown, the following preferred technical solutions are provided:

[0027] The utility model provides a high accuracy ball screw pair pre -tightening structure, including fixed seat 1, one side fixed connection has fixed end 2 in fixed seat 1 top end, one side fixed connection has adjusting assembly 3 in fixed end 2, through the setting of adjusting assembly 3, when the equipment operating condition changes or has new requirement to transmission accuracy when personnel operating device uses, can pass through external power supply, starts servo motor 302, servo motor 302 is accurate rotation according to instruction, drives fixed screw rod 4 rotation through transmission rod 303 and coupling 304, and then make nut seat 501 produce axial displacement, again cooperate fixed nut 503 fine adjustment, can in the big range fast accurate adjustment pre -tightening force, to the automatic fast adjustment of adjusting assembly 3 one end fixed connection has fixed screw rod 4, the surface screw thread connection has ball pre -tightening assembly 5 in fixed screw rod 4, through the setting of ball pre -tightening assembly 5, when personnel operating device uses, the circulation passageway in nut seat 501 ensures that ball circulates smoothly, reduces abrasion, long -term maintains good transmission performance, and fixed nut 503 realizes pre -tightening force adjustment mode simple and effective with nut seat 501 cooperation, and the structure is stable and reliable, in long -term use, pre -tightening force fluctuation is little, can effectively guarantee ball screw pair system stiffness, one end fixed connection has bearing 6 in fixed screw rod 4.

[0028] Specifically, personnel in operating device uses, can flexibly adjust the pre -tightening force of ball screw pair according to equipment operating demand, to adapt to the high accuracy transmission requirement under different operating conditions, and in the long -term operation process of device, can effectively guarantee the stable work of each component, reduces maintenance frequency.

[0029] Further, as shown in Figure 1 The following preferred technical solutions are provided:

[0030] One end of the bearing 6 is fixedly connected to the support end 7, and the bottom end of the support end 7 is fixedly connected to the other side of the top end of the fixed seat 1. The purpose of this design is to provide a stable support point for the fixed screw rod 4, cooperate with the fixed end 2, limit the axial and radial displacement of the fixed screw rod 4, ensure that it can maintain a stable rotation axis when rotating at high speed and bearing axial and radial forces, so that the transmission of the ball screw pair is more stable and accurate, and transmission errors caused by screw rod shaking are avoided.

[0031] Further, as shown in Figure 5 The following preferred technical solutions are provided:

[0032] The adjusting assembly 3 comprises a motor box 301 fixedly connected to one side of the fixed end 2, and a servo motor 302 fixedly connected inside the motor box 301. The purpose of this design is to use the accurate speed control and position feedback function of the servo motor 302 as the power source for pre-tightening force adjustment. By receiving instructions from an external control system, the servo motor 302 can accurately control the rotation angle and speed of the output shaft, thereby achieving precise adjustment of the pre-tightening force of the ball screw pair, meeting the diversified needs for pre-tightening force in different working scenarios. For example, when a numerical control machine tool processes parts with different precision requirements, it can quickly switch the pre-tightening force.

[0033] Further, as shown in Figure 5 the following preferred technical solutions are provided:

[0034] The output end of the servo motor 302 is spline-connected with a transmission rod 303, and one end of the transmission rod 303 is fixedly connected with a shaft coupling 304. The purpose of this design is to ensure stable and accurate power transmission between the servo motor 302 and the transmission rod 303 through spline connection, effectively avoiding slipping and gap problems during high-torque transmission, ensuring the accuracy during pre-tightening force adjustment. The shaft coupling 304 can compensate for possible installation errors, axial displacement, and slight deformation during operation between the fixed screw 4 and the transmission rod 303, making the entire transmission system more reliable and further improving the accuracy and stability of pre-tightening force adjustment.

[0035] Further, as shown in Figure 3 the following preferred technical solutions are provided:

[0036] The ball pre-tightening assembly 5 comprises a nut seat 501 threadedly connected to the surface of the fixed screw 4, and the inner wall of the nut seat 501 is slidingly connected with a sliding ball 502 matched with the fixed screw 4. The purpose of this design is to use the rolling friction of the ball between the nut seat 501 and the fixed screw 4 to replace the traditional sliding friction, greatly reducing the friction and improving the transmission efficiency. At the same time, the sliding ball 502 can uniformly distribute axial and radial forces, making the movement of the nut seat 501 on the fixed screw 4 more stable and smooth, laying a foundation for high-precision linear motion conversion or positioning, and providing necessary structural conditions for subsequent pre-tightening force application.

[0037] Further, as shown in Figure 3 the following preferred technical solutions are provided:

[0038] The side of the nut seat 501 is threadedly connected with a fixing nut 503, and the fixing nut 503 is threadedly connected to the surface of the fixed screw 4. The purpose of this design is to change the relative position of the nut seat 501 on the fixed screw 4 by rotating the fixing nut 503, so as to adjust the contact pressure between the sliding ball 502 and the fixed screw 4 and the nut seat 501, and realize the accurate adjustment of the pre-tightening force. This design makes the adjustment range of the pre-tightening force larger and the operation relatively simple. The pre-tightening state of the ball screw pair can be flexibly optimized according to actual needs during the operation of the equipment, so as to achieve the best transmission performance.

[0039] Further, as shown in Figure 3 The following preferred technical solutions are provided:

[0040] The nut seat 501 is internally provided with a circulating channel matched with the sliding ball 502. The circulating channel is used to guide the sliding ball 502 to circulate and roll in the nut seat 501. The purpose of this design is to ensure that the movement track of the sliding ball 502 in the nut seat 501 is stable and continuous, avoid the phenomenon of jamming and blocking of the ball during movement, reduce the wear and energy loss of the ball, and form a dynamic circulating system in the nut seat 501 through the circulating channel, so that the sliding ball 502 can continuously participate in the transmission process, effectively prolong the service life of the ball screw pair, and also help to maintain the long-term stable transmission accuracy.

[0041] Working principle: when it is necessary to adjust the pre-tightening force of the ball screw pair, the external control system sends an instruction to the servo motor 302, and the servo motor 302 accurately rotates by a certain angle according to the instruction. The output shaft drives the transmission rod 303 to rotate through the spline connection, the transmission rod 303 transmits power to the fixed screw 4 through the shaft coupling 304, so that the fixed screw 4 produces corresponding rotary motion. Since the nut seat 501 is in threaded connection with the fixed screw 4, the rotation of the fixed screw 4 will cause the nut seat 501 to displace along the axial direction. At this time, the position of the nut seat 501 can be further fine-tuned by rotating the fixing nut 503, so as to accurately change the contact pressure between the sliding ball 502 and the fixed screw 4 and the nut seat 501, and realize the accurate adjustment of the pre-tightening force. When the ball screw pair is working normally, the rotation of the fixed screw 4 drives the sliding ball 502 to roll in the circulating channel of the nut seat 501, so that the nut seat 501 moves linearly along the axial direction of the fixed screw 4, thereby efficiently and accurately converting rotary motion into linear motion, meeting the demand of the equipment for high-precision linear motion.

[0042] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A high-precision ball screw pair pre-tightening structure, comprising a fixed seat (1), characterized in that: The top end of the fixed seat (1) is fixedly connected with a fixed end (2), one side of the fixed end (2) is fixedly connected with an adjusting assembly (3), one end of the adjusting assembly (3) is fixedly connected with a fixed lead screw (4), the surface of the fixed lead screw (4) is threadedly connected with a ball pre-tightening assembly (5), and one end of the fixed lead screw (4) is fixedly connected with a bearing (6).

2. The high-precision ball screw pair pre-tightening structure according to claim 1, characterized in that: One end of the bearing (6) is fixedly connected with a supporting end (7), and the bottom end of the supporting end (7) is fixedly connected to the other side of the top end of the fixed seat (1).

3. The high-precision ball screw pair pre-tightening structure according to claim 1, characterized in that: The adjusting assembly (3) comprises a motor box (301) fixedly connected to one side of the fixed end (2), and the inside of the motor box (301) is fixedly connected with a servo motor (302).

4. The high-precision ball screw pair pre-tightening structure according to claim 3, characterized in that: The output end of the servo motor (302) is spline-connected with a transmission rod (303), and one end of the transmission rod (303) is fixedly connected with a shaft coupling (304).

5. The high-precision ball screw pair pre-tightening structure according to claim 1, characterized in that: The ball pre-tightening assembly (5) comprises a nut seat (501) threadedly connected to the surface of the fixed lead screw (4), and the inner wall of the nut seat (501) is slidably connected with sliding balls (502) matched with the fixed lead screw (4).

6. The high-precision ball screw pair pre-tightening structure according to claim 5, characterized in that: One side of the nut seat (501) is threadedly connected with a fixed nut (503), and the fixed nut (503) is threadedly connected to the surface of the fixed lead screw (4).

7. The high-precision ball screw pair pre-tightening structure according to claim 5, characterized in that: The inside of the nut seat (501) is provided with a circulation channel matched with the sliding balls (502), and the circulation channel is used for guiding the sliding balls (502) to circulate and roll in the nut seat (501).

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