CN220060410U

CN220060410U - Screw transmission mechanism with anti-backlash function

Info

Publication number: CN220060410U
Application number: CN202223580282.6U
Authority: CN
Inventors: 张育玮; 张进兴; 林保全
Original assignee: Nanjing Grind Tec Precision Co ltd
Current assignee: Nanjing Grind Tec Precision Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-11-21
Anticipated expiration: 2032-12-31

Abstract

The utility model discloses a screw transmission mechanism with a gap eliminating function, which comprises a screw rod assembly, a moving assembly and an anti-collision assembly, wherein the screw rod assembly comprises a ball screw and erection shafts arranged at two ends of the ball screw, the moving assembly comprises a moving seat movably arranged at the outer side of the ball screw, a fastening sleeve symmetrically arranged in the moving seat, a ball nut movably arranged in the fastening sleeve and cavities arranged at two ends of the moving seat, the anti-collision assembly comprises a hollow shaft arranged in the cavity, a buffer rod movably arranged at one side of the hollow shaft, a stress plate arranged at one side of the buffer rod, a baffle ring arranged at one side of the stress plate, a buffer pad arranged at one side of the baffle ring, a piston plate arranged at the other side of the buffer rod, a buffer spring arranged at one side of the piston plate and a connecting groove arranged at the other side of the hollow shaft.

Description

Screw transmission mechanism with anti-backlash function

Technical Field

The utility model relates to the technical field of screw transmission mechanisms, in particular to a screw transmission mechanism with a clearance eliminating function.

Background

The ball screw is a transmission element most commonly used in tool machinery and precision machinery, has the main function of converting rotary motion into linear motion or converting torque into axial repeated acting force, has the characteristics of high precision, reversibility and high efficiency, and is widely applied to mechanical processing such as grinding and the like. A certain gap exists between the ball screw and the ball nut, so that the ball nut is not stable enough to move, and meanwhile, the moving part is not stable enough to move, and the processing quality of a workpiece can be influenced

Disclosure of Invention

The utility model aims to provide a screw transmission mechanism with a backlash eliminating function, so as to solve the problems in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the screw transmission mechanism with the gap eliminating function comprises a screw rod assembly, a moving assembly and an anti-collision assembly, wherein the screw rod assembly comprises a ball screw and erection shafts arranged at two ends of the ball screw, the moving assembly comprises a movable seat which is movably arranged at the outer side of the ball screw, a fastening sleeve which is symmetrically arranged inside the movable seat, a ball nut which is movably arranged inside the fastening sleeve and a cavity which is formed at two ends of the movable seat, the anti-collision assembly comprises a hollow shaft arranged inside the cavity, a buffer rod movably arranged at one side of the hollow shaft, a stress plate arranged at one side of the buffer rod, a baffle ring arranged at one side of the stress plate, a buffer pad arranged at one side of the baffle ring, a piston plate arranged at the other side of the buffer rod, a buffer spring arranged at one side of the piston plate and a connecting groove formed at the other side of the hollow shaft.

Preferably, the buffer rod penetrates through one side of the hollow shaft, the stress plate is located on one side of the movable seat, the piston plate is located inside the hollow shaft, and one side of the buffer spring is connected with one side inner wall of the hollow shaft.

Preferably, a butt joint groove is formed in one end of the erection shaft, and clamping grooves are symmetrically formed in the outer surface of the erection shaft.

Preferably, the inner wall of the fastening sleeve is provided with a ball groove, and the inner wall of the ball groove is in contact with the ball nut.

Preferably, the locating pin is installed at the bottom of the fastening sleeve above, the pin groove is formed in the top of the fastening sleeve below, and the inner wall of the pin groove is in contact with the outer side of the locating pin.

Preferably, a fastening bolt is installed on the outer surface of the movable seat, and the fastening bolt penetrates through the fastening sleeve.

Preferably, a connecting shaft is mounted on the inner wall of one side of the cavity, and the outer side of the connecting shaft is in contact with the inner wall of the connecting groove.

By adopting the technical scheme, the beneficial effects obtained by the utility model are as follows:

1. the buffer rod, the baffle ring, the buffer cushion and the buffer spring are arranged in the utility model, if the buffer cushion is excessively moved in the moving process of the movable seat, the buffer assemblies arranged at the two ends of the buffer cushion can form good buffer protection for the movable seat, when the movable seat impacts the driving mechanism, the buffer cushion firstly absorbs a part of impact force to play a role of buffering, the buffer cushion is made of rubber materials, rigid contact between the movable seat and the driving mechanism is avoided, good protection is formed for the movable seat and the driving mechanism, the impact force is acted on the stress plate by the baffle ring, the contact area between the baffle ring and the buffer rod is further increased by the stress plate, good stress protection is formed for the baffle ring, the stress plate presses the buffer rod to move to one side of the hollow shaft, the buffer spring is extruded by the stress plate, the buffer spring is contracted, the residual impact force is applied to the buffer rod and the buffer spring, good cancellation is formed for the device, and the service life of the device is further prolonged.

2. The utility model is provided with the connecting shaft and the connecting groove, when the anti-collision assembly is installed, the connecting groove is formed in the hollow shaft, the connecting shaft installed on the cavity is inserted into the connecting groove in a butt joint manner, so that the anti-collision assembly can be fixed, when the anti-collision assembly is required to be maintained or replaced, the hollow shaft is pulled out of the connecting shaft, the structure is simple, the operation is convenient, the dismounting time of the anti-collision assembly is saved, and the working efficiency is further improved.

Drawings

Fig. 1 is a schematic perspective view of the whole device of the present utility model.

Fig. 2 is a schematic perspective view of a moving assembly according to the present utility model.

FIG. 3 is a schematic cross-sectional view of a mobile assembly according to the present utility model.

Fig. 4 is a schematic cross-sectional view of a bumper assembly in accordance with the present utility model.

In the figure: 100. a screw assembly; 101. a ball screw; 102. erecting a shaft; 103. a butt joint groove; 104. a clamping groove;

200. a moving assembly; 201. a movable seat; 202. a fastening sleeve; 203. a ball nut; 204. a ball groove; 205. a positioning pin; 206. a pin slot; 207. a fastening bolt; 208. a cavity; 209. a connecting shaft;

300. an anti-collision assembly; 301. a hollow shaft; 302. a buffer rod; 303. a force-bearing plate; 304. a baffle ring; 305. a cushion pad; 306. a piston plate; 307. a buffer spring; 308. and a connection groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiment one:

referring to fig. 1-4, a screw drive mechanism with anti-backlash function;

comprises a buffer rod 302, a baffle ring 304, a buffer cushion 305 and a buffer spring 307, wherein the two ends of the ball screw 101 are provided with a mounting shaft 102, one end of the mounting shaft 102 is provided with a butt joint groove 103, the outer surface of the mounting shaft 102 is symmetrically provided with a clamping groove 104, the outer side of the ball screw 101 is movably provided with a movable seat 201, the inner part of the movable seat 201 is symmetrically provided with a fastening sleeve 202, the inner part of the fastening sleeve 202 is movably provided with a ball nut 203, the two ends of the movable seat 201 are provided with a cavity 208, the inner wall of the fastening sleeve 202 is provided with a ball groove 204, the inner wall of the ball groove 204 is contacted with the ball nut 203, the bottom of the upper fastening sleeve 202 is provided with a positioning pin 205, the top of the lower fastening sleeve 202 is provided with a pin groove 206, the inner wall of the pin groove 206 is contacted with the outer side of the positioning pin 205, the outer surface of the movable seat 201 is provided with a fastening bolt 207, the fastening bolt 207 runs through the fastening sleeve 202, the engagement shaft 209 is installed to one side inner wall of cavity 208, the outside of engagement shaft 209 and the inner wall of engagement groove 308 contact each other, the inside of cavity 208 sets up hollow shaft 301, one side movable mounting of hollow shaft 301 has buffer rod 302, one side that buffer rod 302 runs through hollow shaft 301, the atress board 303 is installed to one side of buffer rod 302, atress board 303 is located one side of moving seat 201, the check ring 304 is installed to one side of atress board 303, the blotter 305 is installed to one side of check ring 304, piston plate 306 is installed to the opposite side of buffer rod 302, piston plate 306 is located the inside of hollow shaft 301, buffer spring 307 is installed to one side of piston plate 306, one side of buffer spring 307 is connected with one side inner wall of hollow shaft 301, engagement groove 308 has been seted up to the opposite side of hollow shaft 301.

Specifically, when the device is used, the ball screw 101 and the movable seat 201 form a main structure of the device, the main structure is used for providing mounting positions for other structures, the stability of the device is ensured, the ball screw 101 and the driving structure can be fixed together through the butt joint groove 103 and the clamping groove 104 which are formed on the erection shaft 102, when the ball screw 101 is rotated by the driving mechanism, the ball screw 101 drives the ball nut 203 which is arranged in the movable seat 201 to move, thereby realizing the movement of the movable seat 201, the arrangement of the ball nut 203 further reduces the friction resistance between the ball screw 101 and the movable seat 201, improves the sensitivity and the accuracy when the movable seat 201 moves, has no crawling phenomenon when the movable seat 201 starts to move at a low speed, the fastening sleeve 202 which is symmetrically arranged in the movable seat 201 can be used for fastening the ball nut 203, eliminates the axial clearance of the ball nut 203, therefore, the purpose of stable movement is achieved, the symmetrically installed fastening sleeves 202 are fixed together through the positioning pins 205 and the pin grooves 206, the ball grooves 204 formed in the symmetrically installed fastening sleeves are used for ensuring smooth movement of the ball nuts 203, when the fastening sleeves 202 are required to be adjusted, gaps between the fastening sleeves 202 can be changed through rotating the fastening bolts 207, the cavities 208 provide installation positions for the anti-collision assemblies, in the moving process of the moving seat 201, if excessive movement occurs, the anti-collision assemblies installed at the two ends of the moving seat 201 can form good anti-collision buffer protection for the moving seat 201, when the moving seat 201 impacts a driving mechanism, firstly, the buffer cushion 305 absorbs part of impact force to play a role of buffering, the buffer cushion 305 is made of rubber material, rigid contact between the moving seat 201 and the driving mechanism is avoided, good protection is formed for the two, the impact force is acted on the stress plate 303 by the baffle ring 304, the stress plate 303 further increases the contact area between the baffle ring 304 and the buffer rod 302, a good stress protection is formed for the baffle ring 304, the buffer rod 302 is extruded by the stress plate 303 to move towards one side of the hollow shaft 301, the buffer spring 307 is extruded by the piston plate 306, the buffer spring 307 is contracted, the rest impact force is well counteracted on the buffer rod 302 and the buffer spring 307, a good protection is formed for the device, the service life of the device is further prolonged, when the anti-collision assembly is installed, the connecting groove 308 is formed in the hollow shaft 301, the connecting shaft 209 installed on the cavity 208 is butt-jointed and inserted into the connecting groove 308, the anti-collision assembly can be fixed, when the anti-collision assembly is required to be maintained or replaced, the hollow shaft 301 is pulled out from the connecting shaft 209, the anti-collision assembly is simple in structure and convenient to operate, the dismounting time of the anti-collision assembly is saved, and the working efficiency is further improved.

Working principle: the ball screw 101 and the driving structure can be fixed together through the butt joint groove 103 and the clamping groove 104 which are formed in the erection shaft 102, when the ball screw 101 is rotated through the driving mechanism, the ball screw 101 drives the ball nut 203 which is arranged in the movable seat 201 to move, so that the movable seat 201 is moved, the fastening sleeve 202 which is symmetrically arranged in the movable seat 201 can be used for fastening the ball nut 203, the axial gap of the ball nut 203 is eliminated, when the movable seat 201 moves, if the movable seat excessively collides with the driving mechanism, the buffer cushion 305 absorbs part of impact force, the rest of impact force acts on the buffer rod 302 through the baffle ring 304, the buffer spring 307 is extruded by the piston plate 306, the buffer spring 307 is contracted, the rest of impact force is well counteracted on the buffer rod 302 and the buffer spring 307, the fixing of the anti-collision assembly can be completed by butt-jointing the connecting shaft 209 which is arranged on the cavity 208 into the connecting groove 308 when the anti-collision assembly is installed, and when the anti-collision assembly is required to be maintained or replaced, the hollow shaft 301 is pulled out from the connecting shaft 209.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. Screw drive mechanism with anti-backlash function, its characterized in that includes:

the screw assembly (100) comprises a ball screw (101) and erection shafts (102) arranged at two ends of the ball screw (101);

the moving assembly (200) comprises a moving seat (201) movably arranged on the outer side of the ball screw (101), a fastening sleeve (202) symmetrically arranged in the moving seat (201), a ball nut (203) movably arranged in the fastening sleeve (202) and cavities (208) formed at two ends of the moving seat (201);

the anti-collision assembly (300) comprises a hollow shaft (301) arranged in the cavity (208), a buffer rod (302) movably arranged on one side of the hollow shaft (301), a force bearing plate (303) arranged on one side of the buffer rod (302), a baffle ring (304) arranged on one side of the force bearing plate (303), a buffer pad (305) arranged on one side of the baffle ring (304), a piston plate (306) arranged on the other side of the buffer rod (302), a buffer spring (307) arranged on one side of the piston plate (306) and a connecting groove (308) arranged on the other side of the hollow shaft (301).

2. The screw transmission mechanism with the backlash eliminating function according to claim 1, wherein the buffer rod (302) penetrates through one side of the hollow shaft (301), the force receiving plate (303) is positioned on one side of the movable seat (201), the piston plate (306) is positioned inside the hollow shaft (301), and one side of the buffer spring (307) is connected with one side inner wall of the hollow shaft (301).

3. The screw transmission mechanism with the anti-backlash function according to claim 1, wherein a butt joint groove (103) is formed at one end of the erection shaft (102), and clamping grooves (104) are symmetrically formed on the outer surface of the erection shaft (102).

4. The screw transmission mechanism with the backlash eliminating function according to claim 1, wherein the inner wall of the tightening sleeve (202) is provided with a ball groove (204), and the inner wall of the ball groove (204) is in contact with the ball nut (203).

5. The screw transmission mechanism with the anti-backlash function according to claim 1, wherein a positioning pin (205) is installed at the bottom of the upper fastening sleeve (202), a pin groove (206) is formed at the top of the lower fastening sleeve (202), and the inner wall of the pin groove (206) is in contact with the outer side of the positioning pin (205).

6. The screw transmission mechanism with the backlash eliminating function according to claim 1, characterized in that a fastening bolt (207) is mounted on the outer surface of the movable seat (201), and the fastening bolt (207) penetrates through the fastening sleeve (202).

7. The screw transmission mechanism with the backlash eliminating function according to claim 1, wherein an engagement shaft (209) is installed on an inner wall of one side of the cavity (208), and an outer side of the engagement shaft (209) is in contact with an inner wall of the engagement groove (308).