Positioning structure for robot transmission shaft

Abstract

The utility model discloses a positioning structure for a robot transmission shaft, and relates to the field of robot design. Comprising a shell and a transmission shaft, the shell is provided with a shaft hole and a positioning bolt hole perpendicular to the shaft hole, the interior of the shaft hole is divided into an inner shaft hole section and an outer shaft hole section through the positioning bolt hole, the inner shaft hole section is provided with an inner thread, and the tail end of the transmission shaft is provided with an outer thread matched with the inner thread. A positioning bolt hole is formed in the shaft hole, a conical groove is formed in the transmission shaft, the conical groove is arranged to be opposite to the positioning bolt hole after the transmission shaft is completely matched with the shaft hole, a chamfer is arranged at the front end of the positioning bolt, and the chamfer of the positioning bolt abuts against the conical groove after the positioning screw is tightened. The positioning structure is simple and machined, the problem that the transmission shaft is prone to loosening in the high-speed rotating process can be solved, large torque and force can be transmitted, and the positioning structure is suitable for joint design of a large-load industrial robot.

Description

Technical Field

[0001] The utility model relates to the field of robot design, in particular to a positioning structure for a robot transmission shaft. Background Art

[0002] With the development of modern industrial technology, industrial robots are increasingly used in various production fields. People have higher and higher requirements for the quality, efficiency and applicability of robots. Among them, the transmission part of industrial robots has an important impact on operating efficiency and accuracy. In order to improve performance, manufacturers have developed different connection structures to meet different needs. However, in the existing technology, the transmission shaft connection method is mostly complicated, difficult to install and maintain, and inefficient.

[0003] In the prior art, for example, a shaft positioning tool utility model with publication number CN115431198A discloses positioning the shaft by means of a convex key and a threaded hole. However, in order to achieve a good positioning effect, the tool structure disclosed in the patent is complex.

[0004] At present, the transmission shafts of traditional industrial robots are mostly connected by thread, bolt, or interference. However, these technologies have their own shortcomings. For example, bolt connection requires a larger installation space, which cannot be met for some compact robots; interference connection is extremely inconvenient to install and disassemble, and is easy to damage; while threaded connection is easy to install and disassemble, but when applied to large-load robots, the torque generated during rotation is large, causing the thread to loosen easily. The top screw, also called a locking screw, is used to fix the relative position of two parts and can transmit force and torque, but the top screw is easy to loosen during the rotation of the transmission shaft due to the small contact area, especially for large torque. Therefore, the industrial robot's needs for positioning structures in terms of stability, torque transmission, and ease of assembly and disassembly are not met.

[0005] In summary, the existing connection methods cannot meet the requirements of industrial robots for connection stability, torque transmission, and easy loading and unloading under high-speed dynamic conditions. Therefore, there is an urgent need for a new connection structure that is simple in system, easy to install, stable in structure, can remain stable during high-speed movement, and can transmit large torque and force to solve the above problems, thereby improving the performance of industrial robots. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a positioning structure for a robot transmission shaft. The positioning structure has a simple structure and has been processed. It is also easy to disassemble. It can not only avoid the problem of the transmission shaft being easily loosened during high-speed rotation, but also can transmit large torque and force. It is suitable for the joint design of large-load industrial robots.

[0007] To achieve the above-mentioned objectives, the present application discloses a positioning structure for a robot transmission shaft, comprising a shell and a transmission shaft, the shell thickness being smaller than the diameter of the rotating shaft, the shell being provided with an axial hole and a positioning bolt hole perpendicularly arranged to the axial hole, the interior of the axial hole being divided into an inner axial hole section and an outer axial hole section by the positioning bolt hole, the inner axial hole section being provided with an internal thread, the end of the transmission shaft being provided with an external thread matching the internal thread, a conical groove being provided on the side of the transmission shaft that is closer to the front end of the transmission shaft relative to the external thread, the conical groove being arranged so that when the transmission shaft is fully matched with the axial hole, the conical groove is opposite to the positioning bolt hole, and also comprising a positioning bolt, the front end of the positioning bolt being provided with a chamfer, and when the positioning screw is tightened, the chamfer of the positioning bolt is against the conical groove.

[0008] Furthermore, the diameter of the outer shaft hole section is greater than the diameter of the inner shaft hole section, and the chamfer of the front end of the positioning bolt is equal to the taper of the transmission shaft groove.

[0009] Furthermore, the positioning bolt is a hexagon socket bolt.

[0010] Furthermore, the width of the tapered groove is greater than the diameter of the positioning bolt.

[0011] Furthermore, a gasket is provided between the shaft hole of the housing and the transmission shaft.

[0012] Beneficial effects of the technical solution of the utility model:

[0013] The front end of the positioning bolt of the present invention is provided with a chamfer having the same taper as the transmission shaft groove, and can be directly processed from a standard bolt. Figure 3 As shown. For the convenience of processing, the width of the tapered groove of the drive shaft is slightly larger than the diameter of the positioning bolt; after the positioning bolt is installed, the tapered surface of the threaded end of the tapered groove is squeezed, and the thread glue is used to ensure that the drive shaft does not loosen. Therefore, the present invention has the advantages of easy installation and disassembly, the drive shaft is not easy to loosen during the rotation process, and can transmit large torque and force, which is suitable for robot joint design. It is particularly suitable for places that bear large loads and are inconvenient to process and install joints, and the drive shaft is easy to loosen. In addition, it is also applicable to situations with smaller loads. Compared with the processing scheme of the prior art, it has the advantages of easy installation and disassembly, the shell does not need to reserve a large installation space, and the risk of inappropriate processing and testing of the drive shaft is reduced, and there is no problem of damaging the overall strength and rigidity of the drive shaft; compared with the top screw positioning of the prior art, the present invention has the advantages of not being easy to loosen during high-speed rotation and transmitting large torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 The utility model is a schematic structural diagram of a positioning structure for a robot transmission shaft disclosed in the present invention.

[0016] Figure 2 The utility model is a structural cross-sectional view of a positioning structure for a robot transmission shaft disclosed in the utility model.

[0017] Figure 3 The utility model is a schematic diagram of the positioning bolt structure for the robot transmission shaft disclosed in the present invention.

[0018] Among them: 1. Housing, 2. Transmission shaft, 3. Shaft hole, 4. Positioning bolt hole, 31. Inner shaft hole section, 32. Outer shaft hole section, 5. Inner thread, 6. Outer thread, 7. Tapered groove, 8. Positioning bolt, 9. Chamfer, 10. Washer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] For examples, see Figure 1-3 A positioning structure for a robot transmission shaft comprises a shell 1 and a transmission shaft 2, wherein the thickness of the shell 1 is less than the diameter of the rotating shaft 2, the shell is provided with an axial hole 3 and a positioning bolt hole 4 vertically arranged with the axial hole, the interior of the axial hole 3 is divided into an inner axial hole section 31 and an outer axial hole section 32 through the positioning bolt hole 4, the inner axial hole section is provided with an internal thread 5, the end of the transmission shaft 2 is provided with an external thread 6 matching the internal thread 5, a tapered groove 7 is provided on the side of the transmission shaft closer to the front end of the transmission shaft relative to the external thread 6, the tapered groove 7 is arranged so that when the transmission shaft is fully matched with the axial hole, the tapered groove 7 is opposite to the positioning bolt hole 4, and also comprises a positioning bolt 8, the front end of the positioning bolt 8 is provided with a chamfer 9, and when the positioning screw is tightened, the chamfer 9 of the positioning bolt is against the tapered groove 7.

[0021] The front end of the positioning bolt of the present invention is provided with a chamfer having the same taper as the transmission shaft groove, and can be directly processed from a standard bolt. Figure 3 As shown. For the convenience of processing, the width of the tapered groove of the drive shaft is slightly larger than the diameter of the positioning bolt; after the positioning bolt is installed, the tapered surface of the threaded end of the tapered groove is squeezed, and the thread glue is used to ensure that the drive shaft does not loosen. Therefore, the present invention has the advantages of easy installation and disassembly, the drive shaft is not easy to loosen during the rotation process, and can transmit large torque and force, which is suitable for robot joint design. It is particularly suitable for places that bear large loads and are inconvenient to process and install joints, and the drive shaft is easy to loosen. In addition, it is also applicable to situations with smaller loads. Compared with the processing scheme of the prior art, it has the advantages of easy installation and disassembly, the shell does not need to reserve a large installation space, and the risk of inappropriate processing and testing of the drive shaft is reduced, and there is no problem of damaging the overall strength and rigidity of the drive shaft; compared with the top screw positioning of the prior art, the present invention has the advantages of not being easy to loosen during high-speed rotation and transmitting large torque.

[0022] As a preferred embodiment, the diameter of the outer shaft hole section 32 is larger than the diameter of the inner shaft hole section 31, and the chamfer at the front end of the positioning bolt is equal to the taper of the transmission shaft groove. By making the diameter of the outer shaft hole section 32 larger than the diameter of the inner shaft hole section 31, this design can make the assembly process simpler, and this design may also improve the stability and reliability of the assembly during use. The chamfer at the front end of the positioning bolt is equal to the taper of the transmission shaft groove, so that accurate and automatic assembly alignment can be achieved.

[0023] Generally speaking, the positioning bolt is a hexagon socket bolt, which is convenient for installation.

[0024] Preferably, the width of the tapered groove is greater than the diameter of the positioning bolt. The width of the tapered groove of the transmission shaft is slightly greater than the diameter of the positioning bolt; after the positioning bolt is installed, it squeezes the conical surface of the thread end of the tapered groove and cooperates with the thread glue to ensure that the transmission shaft does not loosen.

[0025] More preferably, a gasket 10 is provided between the shaft hole 3 of the housing 1 and the transmission shaft 2 .

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning structure for a robot transmission shaft, comprising a housing (1) and a transmission shaft (2), characterized in that: The thickness of the housing (1) is smaller than the diameter of the transmission shaft (2). The housing is provided with an axial hole (3) and a positioning bolt hole (4) arranged perpendicular to the axial hole. The interior of the axial hole (3) is divided into an inner axial hole section (31) and an outer axial hole section (32) by the positioning bolt hole (4). The inner axial hole section is provided with an inner thread (5). The end of the transmission shaft (2) is provided with an outer thread (6) matching the inner thread (5). A conical groove (7) is provided on the side of the transmission shaft closer to the front end of the transmission shaft relative to the outer thread (6). The conical groove (7) is arranged so that when the transmission shaft is fully matched with the axial hole, the conical groove (7) is opposite to the positioning bolt hole (4). The housing also includes a positioning bolt (8). The front end of the positioning bolt (8) is provided with a chamfer (9). When the positioning bolt is tightened, the chamfer (9) of the positioning bolt abuts against the conical groove (7).

2. A positioning structure for a robot transmission shaft according to claim 1, characterized in that: The diameter of the outer shaft hole section (32) is greater than the diameter of the inner shaft hole section (31).

3. The positioning structure for a robot transmission shaft according to claim 1, characterized in that: The positioning bolt is a hexagon socket bolt.

4. The positioning structure for a robot transmission shaft according to claim 1, characterized in that: The width of the tapered groove is greater than the diameter of the positioning bolt, and the chamfer at the front end of the positioning bolt is equal to the taper of the transmission shaft groove.

5. The positioning structure for a robot transmission shaft according to claim 1, characterized in that: A washer (10) is also provided between the shaft hole (3) of the housing (1) and the transmission shaft (2).

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