A miniature ball screw on a robot

Abstract

The utility model relates to a micro ball screw on a robot, comprising a screw and a cylindrical ring-shaped ball nut, one end of the screw is formed with a coupling, the inner wall of the ball nut is formed with a spiral groove, a ball is arranged in the spiral groove, and the screw is screwed in the ball nut through the ball; a plurality of limit slots are formed on the outer wall of one end of the ball nut, and an external thread is formed on the outer wall of the other end; a rectangular groove is formed on the outer wall of the ball nut close to the external thread, a rectangular limit block is inserted in the groove, a limit stud is screwed on the limit block, the end face of the outer end of the limit stud is formed with a regular hexagonal jack, and the inner end is formed with a spherical connector; the bottom surface of the groove on the ball nut is formed with a spherical concave hole, and the connector is embedded in the concave hole of the ball nut. The micro locking structure on the micro ball screw can prevent the ball nut from rotating again when the ball nut is screwed, thereby avoiding the problem of the micro ball screw being separated from the robot mounting part.

Description

Technical field:

[0001] The utility model relates to the technical field of ball screws, and more specifically to a miniature ball screw on a robot. Background technology:

[0002] Ball screws are ideal products for converting rotary motion into linear motion, or converting linear motion into rotary motion. Ball screws are the most commonly used transmission components in tool machinery and precision machinery. Their main function is to convert rotary motion into linear motion, or torque into axial repetitive force, while having the characteristics of high precision, reversibility and high efficiency. Due to their low friction resistance, ball screws are widely used in various industrial equipment and precision instruments. Many ball screws are also used on current robots, most of which are miniature ball screws, such as those used in robot joints. The ball nut of a traditional ball screw is generally provided with a flange, which is fixed to the mounting part by bolts. The mounting position of the robot is narrow, and the flange structure cannot be used for installation. Therefore, the ball nut of the miniature ball screw is processed with an external thread and is installed and connected to the robot by screwing. However, during the operation of the miniature ball screw, the screw will apply a rotational force to the ball nut, and this force can easily cause the thread to loosen between the ball nut and the robot. When the thread loosens, the ball nut will gradually detach from the robot. Therefore, a structure needs to be designed on the miniature ball screw to prevent the thread from loosening. Utility model content:

[0003] The purpose of the utility model is to address the deficiencies of the prior art and to provide a miniature ball screw on a robot, wherein the miniature locking structure on the miniature ball screw can prevent the ball nut from rotating again when the ball nut is threaded, thereby avoiding the problem of the miniature ball screw being detached from the mounting part of the robot.

[0004] A miniature ball screw on a robot comprises a screw and a cylindrical ring-shaped ball nut, wherein a coupling is formed at one end of the screw, a spiral groove is formed on the inner wall of the ball nut, a ball is arranged in the spiral groove, and the screw is screwed in the ball nut through the ball; a plurality of limit slots are formed on the outer wall of one end of the ball nut, and an external thread is formed on the outer wall of the other end; a rectangular groove is formed on the outer wall of the ball nut close to the external thread, a rectangular limit block is inserted in the groove, a limit stud is screwed on the limit block, a regular hexagonal jack is formed on the end face of the outer end of the limit stud, and a spherical connector is formed on the inner end; a spherical concave hole is formed on the bottom surface of the groove on the ball nut, and the connector is embedded in the concave hole of the ball nut.

[0005] Preferably, the side walls of the limit block respectively abut against the side walls of the groove on the ball nut, the inner end surface of the limit block abuts against the bottom surface of the groove, and the outer end surface extends out of the groove of the ball nut.

[0006] Preferably, the limiting stud is arranged on a side of the limiting block close to the limiting slot.

[0007] Preferably, the thread direction of the external thread on the ball nut is opposite to the thread spiral on the lead screw.

[0008] Preferably, the number of the upper limit slots on the ball nut is an even number, and the upper limit slots are evenly distributed in a ring shape around the central axis of the ball nut.

[0009] Preferably, the length of the external thread on the ball nut is less than half the length of the ball nut.

[0010] The beneficial effects of the utility model are:

[0011] The micro locking structure on the micro ball screw can prevent the ball nut from rotating again when the ball nut is screwed, thereby avoiding the problem of the micro ball screw being separated from the robot mounting part. Description of the drawings:

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 It is a partial cross-sectional schematic diagram of the utility model viewed from above;

[0014] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0015] Figure 4 The utility model is a side view schematic diagram of being installed on a robot.

[0016] In the figure: 1. screw; 11. coupling; 2. ball nut; 21. spiral groove; 22. external thread; 23. limit slot; 24. groove; 3. limit block; 4. limit stud; 41. connector; 42. socket; 5. robot component; 51. sinker. Specific implementation method:

[0017] Example: See Figures 1 to 3As shown, a miniature ball screw on a robot comprises a screw 1 and a cylindrical ring-shaped ball nut 2, a coupling shaft 11 is formed at one end of the screw 1, a spiral groove 21 is formed on the inner wall of the ball nut 2, a ball is arranged in the spiral groove 21, and the screw 1 is screwed in the ball nut 2 through the ball; a plurality of limit slots 23 are formed on the outer wall of one end of the ball nut 2, and an external thread 22 is formed on the outer wall of the other end; a rectangular groove 24 is formed on the outer wall of the ball nut 2 close to the external thread 22, a rectangular limit block 3 is inserted in the groove 24, a limit stud 4 is screwed on the limit block 3, the end face of the outer end of the limit stud 4 is formed with a regular hexagonal jack 42, and the inner end is formed with a spherical connector 41; a spherical concave hole 25 is formed on the bottom surface of the groove 24 on the ball nut 2, and the connector 41 is embedded in the concave hole 25 of the ball nut 2.

[0018] The side walls of the limit block 3 respectively abut against the side walls of the groove 24 on the ball nut 2, the inner end face of the limit block 3 abuts against the bottom face of the groove 24, and the outer end face extends out of the groove 24 of the ball nut 2 and is tangent to the outer wall of the ball nut 2, thereby constraining the thickness of the limit block 3 and facilitating the subsequent locking connection.

[0019] The limiting stud 4 is arranged on a side of the limiting block 3 close to the limiting slot 23 .

[0020] The thread direction of the external thread 22 on the ball nut 2 is opposite to the thread spiral on the lead screw 1 .

[0021] The number of the limit slots 23 on the ball nut 2 is an even number, and the limit slots 23 are evenly distributed in a ring shape around the central axis of the ball nut 2, so that the wrench can be conveniently clamped in the limit slots 23 to realize the threaded installation of the ball nut 2.

[0022] The length of the external thread 22 on the ball nut 2 is less than half of the length of the ball nut 2 .

[0023] Working principle: The utility model is a miniature ball screw on a robot. The ball nut 2 of the miniature ball screw is provided with an external thread 22 and a limit slot 23. The ball nut 2 is installed by screw connection. Figure 4 Describe:

[0024] A threaded hole is provided on the robot component 5 on which the ball nut 2 is installed, and a rectangular sinker 51 is opened at the entrance of the threaded hole, and the sinker 51 can be milled; the ball nut 2 is screwed into the threaded hole of the ball nut 2, so that one end of the limit block 3 is inserted into the sinker 51 and is opposite to the side wall of one side of the sinker 51, and then the limit stud 4 is rotated to drive the limit block 3 to move outward and abut against the side wall of the sinker 51. At the same time, the limit block 3 is still inserted on the ball nut 2. Based on the limit of the limit block 3, the ball nut 2 can be prevented from rotating on the robot component 5.

[0025] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A miniature ball screw for a robot, comprising a screw (1) and a cylindrical ring-shaped ball nut (2), wherein a connecting shaft (11) is formed at one end of the screw (1), a spiral groove (21) is formed on the inner wall of the ball nut (2), a ball is arranged in the spiral groove (21), and the screw (1) is screwed into the ball nut (2) via the ball; the characteristics are as follows: A plurality of limiting grooves (23) are formed on the outer wall of one end of the ball nut (2), and an external thread (22) is formed on the outer wall of the other end; a rectangular groove (24) is formed on the outer wall of the ball nut (2) near the external thread (22), a rectangular limiting block (3) is inserted in the groove (24), a limiting stud (4) is screwed on the limiting block (3), a regular hexagonal jack (42) is formed on the end face of the outer end of the limiting stud (4), and a spherical connector (41) is formed on the inner end; a spherical concave hole (25) is formed on the bottom surface of the groove (24) on the ball nut (2), and the connector (41) is embedded in the concave hole (25) of the ball nut (2).

2. The micro ball screw on a robot according to claim 1, characterized in that: The side walls of the limit block (3) respectively abut against the side walls of the groove (24) on the ball nut (2), the inner end surface of the limit block (3) abuts against the bottom surface of the groove (24), and the outer end surface extends out of the groove (24) of the ball nut (2).

3. The micro ball screw on a robot according to claim 1, characterized in that: The limiting stud (4) is arranged on a side of the limiting block (3) close to the limiting slot (23).

4. The micro ball screw on a robot according to claim 1, characterized in that: The thread direction of the external thread (22) on the ball nut (2) is opposite to the thread spiral on the lead screw (1).

5. The micro ball screw on a robot according to claim 1, characterized in that: The number of the upper limit slots (23) on the ball nut (2) is an even number, and the upper limit slots (23) are evenly distributed in a ring shape around the central axis of the ball nut (2).

6. The micro ball screw on a robot according to claim 1, characterized in that: The length of the external thread (22) on the ball nut (2) is less than half the length of the ball nut (2).

Images