High-precision buckle type linear stepping motor

Abstract

The utility model relates to a high-precision buckle type linear stepping motor, which comprises a stepping motor main body and an anti-backlash nut assembly, the anti-backlash nut assembly is arranged on a screw rod at the output end of the stepping motor main body, and the anti-backlash nut assembly comprises a nut body, a clamping sleeve, a torsion spring and an adjusting nut, the nut body is sleeved with the torsion spring, one end of the torsion spring abuts against the clamping sleeve, the clamping sleeve is connected with the adjusting nut in a buckled mode, the other end of the torsion spring abuts against the outer side of the adjusting nut at one end, and the adjusting nut and the nut body are coaxially arranged and both rotationally connected with the lead screw. In order to construct an anti-falling structure of the anti-backlash nut, the nut body and the adjusting nut are combined through buckle type connection in cooperation with elastic jacking and pressing of the torsion spring, so that the problem that the nut falls off due to accidental vibration, vibration or other external factors in the operation process is solved, and the safety and stability of equipment are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a high-precision snap-fit ​​linear stepper motor. Background Technology

[0002] In modern industry and scientific research, the demand for precise positioning and control is becoming increasingly urgent. Linear stepper motors, as a common actuator, are widely used in automation equipment, precision instruments, and medical devices. However, the repeatability of traditional linear stepper motors is usually limited, typically reaching only about 0.03 mm, which may not meet the requirements of some applications with high precision demands.

[0003] Therefore, the development of high-precision technology for linear stepper motors aims to improve the repeatability of the motor, achieving a repeatability within 0.01mm. To achieve this precision, the main focus is on eliminating the gap between the lead screw and the nut, and improving the nut by using a backlash-free nut to achieve a tighter connection with the lead screw, reducing gap and thus improving the accuracy and stability of the stepper motor. However, backlash-free nuts are susceptible to detachment during operation due to unexpected vibrations, shocks, or other external factors, which cannot guarantee the safety and stability of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision snap-fit ​​linear stepper motor to solve the problems encountered in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A high-precision snap-fit ​​linear stepper motor includes a stepper motor body and a backlash-free nut assembly. The backlash-free nut assembly is mounted on the lead screw at the output end of the stepper motor body. The backlash-free nut assembly includes a nut body, a retaining sleeve, a torsion spring, and an adjusting nut. The torsion spring is fitted onto the outside of the nut body, with one end of the torsion spring abutting against the retaining sleeve. The retaining sleeve is snap-fitted to the adjusting nut, and the other end of the torsion spring abuts against the outside of the adjusting nut. The adjusting nut and the nut body are coaxially arranged and both are rotatably connected to the lead screw.

[0007] In the above solution, the nut body includes a base and a sleeve, the base and sleeve are integrally connected, a locking block is provided at the connection between the base and the sleeve, and a locking groove is provided on the side of the sleeve near the base to engage with the locking block. As a preferred solution, the base can be either square or triangular, and the sleeve has a first mounting hole along its axial direction.

[0008] In the above solution, the top outer circumferential surface of the sleeve is provided with an external thread, and the sleeve is connected to a top sleeve through the external thread. The top sleeve abuts against the outside of the adjusting nut. As a preferred solution, the top sleeve is provided with a second mounting hole in the axial direction.

[0009] In the above solution, the top inner side of the sleeve is provided with an internal tooth profile, and one end of the adjusting nut is provided with an external tooth profile that mates with the internal tooth profile. The adjusting nut includes a top head and a sliding sleeve, the top head and the sliding sleeve being integrally connected, and the external tooth profile being located on the outer side of the sliding sleeve. As a preferred solution, a guide groove is provided at the inner end face of the sliding sleeve.

[0010] Compared with existing technologies, the beneficial effects of this utility model are as follows: This solution designs a torsion spring, utilizing its torsional elastic properties to effectively eliminate the gap between the lead screw and the backlash-eliminating nut assembly under different loads in the linear stepper motor, simplifying the pressure adjustment process and improving assembly efficiency and convenience. The clamping sleeve and adjusting nut employ a snap-fit ​​connection with an anti-detachment structure design. This snap-fit ​​design, combined with the elastic pressure of the torsion spring, secures the nut body to the adjusting nut, preventing the adjusting nut from falling off, ensuring the stability and reliability of the linear stepper motor, and improving its service life and safety. Attached Figure Description

[0011] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the gap-eliminating nut assembly in this utility model;

[0014] Figure 3 This is a schematic diagram of the nut body in this utility model;

[0015] Figure 4 This is a schematic diagram of the ferrule structure in this utility model;

[0016] Figure 5 This is a schematic diagram of the top sleeve in this utility model;

[0017] Figure 6 This is a schematic diagram of the adjusting nut in this utility model;

[0018] Figure 7 This is a schematic diagram of the adjusting nut in this utility model from another perspective.

[0019] The following numbers are used in the diagram: 1-Stepper motor body; 2-Lead screw; 3-Backlash-free nut assembly; 31-Nut body; 311-Base; 312-Sleeve; 313-Clamping block; 314-External thread; 315-Internal tooth profile; 32-Clamping sleeve; 321-Clamping groove; 322-First mounting hole; 33-Torsion spring; 34-Top sleeve; 341-Second mounting hole; 35-Adjusting nut; 351-Top head; 352-Sliding sleeve; 353-External tooth profile; 354-Guide groove. Detailed Implementation

[0020] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0021] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2 As shown, a high-precision snap-fit ​​linear stepper motor includes a stepper motor body 1 and a backlash-free nut assembly 3, which is mounted on a lead screw 2 at the output end of the stepper motor body 1. Driven by the stepper motor body 1, the lead screw 2 rotates. When a load is connected to the backlash-free nut assembly 3, the backlash-free nut assembly 3 causes the load to move linearly along the lead screw 2.

[0024] The backlash-eliminating nut assembly 3 includes a nut body 31, a sleeve 32, a torsion spring 33, and an adjusting nut 35. The torsion spring 33 is fitted on the outside of the nut body 31, and one end of the torsion spring 33 abuts against the sleeve 32. The sleeve 32 is snap-fitted to the adjusting nut 35. The other end of the torsion spring 33 abuts against the outside of the adjusting nut 35. The adjusting nut 35 and the nut body 31 are coaxially arranged and are rotatably connected to the lead screw 2.

[0025] This design incorporates a torsion spring 33. By utilizing the torsional elasticity of the torsion spring 33, the gap between the lead screw 2 and the backlash-eliminating nut assembly 3 is effectively eliminated under different loads, simplifying the pressure adjustment process and improving assembly efficiency and convenience. The sleeve 32 and the adjusting nut 35 are connected by a snap-fit ​​mechanism, employing an anti-detachment design. This snap-fit ​​design, combined with the elastic pressure of the torsion spring 33, secures the nut body 31 to the adjusting nut 35, preventing the adjusting nut 35 from falling off. This ensures the stability and reliability of the linear stepper motor, improving its service life and safety.

[0026] Regarding the snap-fit ​​connection between the ferrule 32 and the adjusting nut 35, please refer to the following for specific implementation details. Figure 3 and Figure 4 The nut body 31 includes a base 311 and a sleeve 312. The base 311 and the sleeve 312 are integrally connected. A locking block 313 is provided at the connection between the base 311 and the sleeve 312. Multiple locking blocks 313 are provided and are evenly distributed along the outer circumference of the sleeve 312. The sleeve 32 has a locking groove 321 on the side near the base 311 that engages with the locking block 313. Through the cooperation of the locking block 313 and the locking groove 321, the sleeve 32 is snapped together with the adjusting nut 35.

[0027] The base 311 can be either square or triangular, and has a through hole for fixing it to the load with bolts. The ferrule 32 has a first mounting hole 322 on its axial side, and the ferrule 32 is fixed to the base 311 by screwing in a screw.

[0028] Furthermore, the top outer circumferential surface of the sleeve 312 is provided with an external thread 314. The sleeve 312 is connected to the top sleeve 34 through the external thread 314. Therefore, the external thread 314 is mainly used for a stable connection with the top sleeve 34. The top sleeve 34 abuts against the outside of the adjusting nut 35, thus making a close fit with the adjusting nut 35. The top sleeve 34 is provided with a second mounting hole 341 in the axial direction. By screwing in a screw, the top sleeve 34 is fixed to the adjusting nut 35.

[0029] To ensure a tight fit between the adjusting nut 35 and the nut body 31 and improve load delivery accuracy, an internal tooth profile 315 is provided on the inner side of the top of the sleeve 312. One end of the adjusting nut 35 is provided with an external tooth profile 353 that mates with the internal tooth profile 315. During assembly, the adjusting nut 35 is directly inserted into the internal tooth profile 315 in the nut body 31 using the external tooth profile 353. The external tooth profile 353 has a convex outer circumference, while the internal tooth profile 315 has a concave inner hole. This convex-concave mating structure ensures a tight fit.

[0030] It should also be noted that the adjusting nut 35 includes a top head 351 and a sliding sleeve 352, with the top head 351 and the sliding sleeve 352 integrally connected, wherein the external tooth 353 is located on the outer side of the sliding sleeve 352. As a preferred embodiment, a guide groove 354 is provided at the inner end face of the sliding sleeve 352, so that when the lead screw 2 passes through the joint between the adjusting nut 35 and the nut body 31, it can quickly enter the center of the adjusting nut 35 for a tight fit.

[0031] This invention primarily studies the ease of installation of backlash-free nuts by making existing backlash-free nuts into a single component to achieve rapid assembly while maintaining stable connection and operation. To construct an anti-loosening structure for the backlash-free nut, a torsion spring 33 is used for elastic pressing, and the nut body 31 and adjusting nut 35 are combined via a snap-fit ​​connection. This ensures that the nut will not fall off during operation due to accidental vibration, shock, or other external factors, thus guaranteeing the safety and stability of the equipment.

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-precision snap-fit ​​linear stepper motor, comprising a stepper motor body (1) and a backlash-free nut assembly (3), wherein the backlash-free nut assembly (3) is mounted on a lead screw (2) at the output end of the stepper motor body (1), characterized in that: The backlash-free nut assembly (3) includes a nut body (31), a sleeve (32), a torsion spring (33), and an adjusting nut (35). The torsion spring (33) is fitted on the outside of the nut body (31). One end of the torsion spring (33) abuts against the sleeve (32). The sleeve (32) is snap-fitted to the adjusting nut (35). The other end of the torsion spring (33) abuts against the outside of the adjusting nut (35). The adjusting nut (35) and the nut body (31) are coaxially arranged and both are rotatably connected to the lead screw (2).

2. A high-precision snap-fit ​​linear stepper motor according to claim 1, characterized in that: The nut body (31) includes a base (311) and a sleeve (312). The base (311) and the sleeve (312) are integrally connected. A locking block (313) is provided at the connection between the base (311) and the sleeve (312). The sleeve (32) near the base (311) is provided with a locking groove (321) that is engaged with the locking block (313).

3. A high-precision snap-fit ​​linear stepper motor according to claim 2, characterized in that: The base (311) can be either square or triangular, and the sleeve (32) has a first mounting hole (322) on its axial direction.

4. A high-precision snap-fit ​​linear stepper motor according to claim 2, characterized in that: The top outer circumferential surface of the sleeve (312) is provided with an external thread (314), and the sleeve (312) is connected to a top sleeve (34) through the external thread (314). The top sleeve (34) abuts against the outside of the adjusting nut (35).

5. A high-precision snap-fit ​​linear stepper motor according to claim 4, characterized in that: The top sleeve (34) is provided with a second mounting hole (341) in the axial direction.

6. A high-precision snap-fit ​​linear stepper motor according to claim 2, characterized in that: The sleeve (312) has an internal tooth (315) on its top inner side, and the adjusting nut (35) has an external tooth (353) at one end that matches the internal tooth (315).

7. A high-precision snap-fit ​​linear stepper motor according to claim 6, characterized in that: The adjusting nut (35) includes a top (351) and a sliding sleeve (352). The top (351) and the sliding sleeve (352) are integrally connected, and the external tooth (353) is located on the outside of the sliding sleeve (352).

8. A high-precision snap-fit ​​linear stepper motor according to claim 7, characterized in that: The inner end face of the sliding sleeve (352) is provided with a guide groove (354).

Images