A positioning connection structure, a tool assembly, a tool head and a tool rod

Abstract

The present application provides a positioning connection structure and a tool assembly and a tool head and a tool rod, the positioning connection structure includes part one and part two, part one includes a connection shaft, part two is provided with a connection hole, the connection shaft can be inserted into the connection hole, the side wall of the connection shaft includes a plurality of inner arc surfaces, the inner wall of the connection hole includes a plurality of outer arc surfaces, the connection shaft can rotate relative to the connection hole to a position where the plurality of inner arc surfaces are respectively tangent to the plurality of outer arc surfaces, and can prevent the connection shaft from further rotating in the same direction relative to the connection hole. The positioning connection structure of the present invention realizes high-precision connection between parts assembly, can realize zero gap and zero error of parts, is convenient and fast, especially for high-precision connection between long parts.

Description

Technical Field

[0001] The invention relates to the field of mechanical connection, and in particular to a positioning connection structure, a tool assembly, a tool head and a tool rod. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In the prior art, the matching mode between the connecting shaft and the connecting hole is mostly the shaft-hole clearance matching. No matter how precise the shaft-hole matching is, there is always a clearance due to the tolerance problem, and it is impossible to achieve zero clearance and zero error matching. Another type of matching is the over-positioning cone matching. This matching mode has high requirements on the manufacturing precision of the connecting part of the parts and has high production costs.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a positioning connection structure, a tool assembly, a tool head and a tool rod.

[0006] In order to solve the above technical problems, the present invention provides a positioning connection structure, including part one and part two, part one includes a connecting shaft, part two is provided with a connecting hole, the connecting shaft can be inserted into the connecting hole, the side wall of the connecting shaft includes a plurality of inner arc surfaces, the inner wall of the connecting hole includes a plurality of outer arc surfaces, the connecting shaft can rotate relative to the connecting hole to a position where the plurality of inner arc surfaces are respectively tangent to the plurality of outer arc surfaces, and can prevent the connecting shaft from further rotating in the same direction relative to the connecting hole.

[0007] Preferably, the diameters of the multiple inner arc surfaces are equal, the centers of the circles fall on a second circle, and they are arranged at equal intervals on the second circle, and the center of the second circle falls on the axis line of the connecting shaft; the diameters of the multiple outer arc surfaces are equal, the centers of the circles fall on a first circle, and they are arranged at equal intervals on the first circle, when the multiple inner arc surfaces are respectively tangent to the multiple outer arc surfaces, the center of the first circle falls on the axis line of the connecting shaft, and the diameter of the second circle is larger than the diameter of the first circle.

[0008] Preferably, when the inner arc surface is tangent to the outer arc surface, the center of the inner arc surface, the center of the outer arc surface and the axis are not on the same straight line.

[0009] Preferably, the multiple inner arc surfaces are arranged at intervals, and the inner side surface is between two adjacent inner arc surfaces. The side wall of the connecting shaft is formed by surrounding the multiple inner arc surfaces and the multiple inner side surfaces. The multiple outer arc surfaces are arranged at intervals, and the outer side surfaces are between two adjacent outer arc surfaces. The inner wall of the connecting hole is formed by surrounding the multiple outer arc surfaces and the multiple outer side surfaces.

[0010] Preferably, the inner side surface is a planar structure, the outer side surface is an arc surface structure protruding outward relative to the outer arc surface, the connecting hole portion surrounded by the outer side surface forms an avoidance space for accommodating the inner arc surface, and when the inner arc surface of the connecting shaft and the outer side surface of the connecting hole are in a position close to each other, there is a gap between the inner arc surface and the outer side surface.

[0011] Preferably, the side wall of the connecting shaft has three inner arc surfaces, and the inner wall of the connecting hole has three outer arc surfaces. When the connecting shaft is inserted into the connecting hole and rotated in the same direction, the three outer arc surfaces are respectively tangent to the three inner arc surfaces to form a three-point positioning structure.

[0012] Specifically, three equally divided points are randomly selected on the first circle to form the center of the outer arc surface, and a single equally divided point is randomly selected on the second circle to form the center of the inner arc surface, thereby forming an eccentric structure of the outer arc surface and the inner arc surface.

[0013] The present application also provides a tool assembly, the tool assembly having the positioning connection structure, the first part being the tool head, and the second part being the tool rod.

[0014] Preferably, the tool head also includes a tool head body, the connecting shaft is arranged on the tool head body, the connecting shaft is provided with a through hole, the through hole is coaxially arranged with the connecting shaft, the bottom of the connecting hole of the tool rod is also provided with a threaded hole coaxially arranged with the connecting hole, and the tool assembly also includes a screw. When the connecting shaft is inserted into the connecting hole, the screw passes through the threaded hole and the through hole to connect the tool head with the tool rod.

[0015] The present application also provides a tool head, and the tool head is the part one.

[0016] The present application also provides a tool rod, and the tool rod is the part two.

[0017] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0018] The positioning connection structure of the present invention realizes high-precision connection between parts assembly, can achieve zero gap and zero error of parts, is convenient and fast, especially for high-precision connection between long parts. The connection structure of the present application reduces the manufacturing precision requirements when connecting parts, is easy to manufacture, and can achieve high connection positioning precision without relying on the manufacturing tolerance control of the connecting part of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the tool head of the present application;

[0020] Figure 2 It is a schematic diagram of the structure of the tool rod of the present application;

[0021] Figure 3 It is a schematic diagram of the end surface structure of the tool head of the present application;

[0022] Figure 4 is a schematic diagram of the end surface structure of the tool rod of the present application;

[0023] Figure 5 It is a schematic diagram of the end surface structure of the connecting shaft of the tool head of the present application;

[0024] Figure 6 It is a schematic diagram of the end surface structure of the connecting hole of the tool rod of the present application;

[0025] Figure 7 It is a schematic diagram of the structure in which the connecting shaft of the tool head of the present application is inserted into the connecting hole;

[0026] Figure 8 It is a schematic diagram of the structure after the connecting shaft of the tool head of the present application and the connecting hole of the tool rod are locked.

[0027] Among them: 1. connecting shaft; 2. tool head body; 3. through hole; 4. tool rod; 5. connecting hole; 6. threaded hole; 11. inner arc surface; 12. inner side surface; 41. outer arc surface; 42. outer side surface; 10. first circle; 20. second circle; 51. gap. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] The present invention provides a positioning connection structure, including part one and part two, wherein part one includes a connecting shaft 1, and part two is provided with a connecting hole 5, wherein the connecting shaft 1 can be inserted into the connecting hole 5, wherein the side wall of the connecting shaft 1 includes a plurality of inner arc surfaces 11, and the inner wall of the connecting hole 5 includes a plurality of outer arc surfaces 41, wherein the connecting shaft 1 can rotate relative to the connecting hole 5 to a position where the plurality of inner arc surfaces 11 are respectively tangent to the plurality of outer arc surfaces 41, and wherein the connecting shaft 1 can be prevented from further rotating relative to the connecting hole 5 in the same direction. The diameters of the multiple inner arc surfaces 11 are equal, and the centers fall on a second circle 20, and are arranged at equal intervals on the second circle 20, and the center of the second circle 20 falls on the axis of the connecting shaft 1; the diameters of the multiple outer arc surfaces 41 are equal, and the centers fall on a first circle 10, and are arranged at equal intervals on the first circle 10. When the multiple inner arc surfaces 11 are tangent to the multiple outer arc surfaces 41 respectively, the center of the first circle 10 falls on the axis of the connecting shaft 1, and the diameter of the second circle 20 is greater than the diameter of the first circle 10. When the inner arc surface 11 is tangent to the outer arc surface 41, the center of the inner arc surface 11, the center of the outer arc surface 41 and the axis are not on the same straight line. The multiple inner arc surfaces 11 are arranged at intervals, and the inner side surface 12 is between two adjacent inner arc surfaces 11. The side wall of the connecting shaft 1 is formed by surrounding the multiple inner arc surfaces 11 and the multiple inner side surfaces 12. The multiple outer arc surfaces 41 are arranged at intervals, and the two adjacent outer arc surfaces 41 are the outer side surfaces 42. The inner wall of the connecting hole 5 is formed by surrounding the multiple outer arc surfaces 41 and the multiple outer side surfaces 42.

[0031] The inner side surface 12 is a planar structure, and the outer side surface 42 is an arc surface structure protruding outward relative to the outer arc surface 41. The connecting hole 5 surrounded by the outer side surface 42 forms an escape space for accommodating the inner arc surface 11. When the inner arc surface 11 of the connecting shaft 1 and the outer side surface 42 of the connecting hole 5 are in a position close to each other, there is a gap 51 between the inner arc surface 11 and the outer side surface 42.

[0032] like Figures 1 to 8As shown, a tool assembly of the present application is provided. The tool assembly has the positioning connection structure. The first part is a tool head, and the second part is a tool rod 4. The tool head also includes a tool head body 2. The connecting shaft 1 is provided on the tool head body 2. The connecting shaft 1 is provided with a through hole 3. The through hole 3 is coaxially arranged with the connecting shaft 1. The bottom of the connecting hole 5 of the tool rod 4 is also provided with a threaded hole 6 coaxially arranged with the connecting hole 5. The tool assembly also includes a screw. When the connecting shaft 1 is inserted into the connecting hole 5, the screw passes through the threaded hole 6 and the through hole 3 to connect the tool head with the tool rod 4. The side wall of the connecting shaft 1 has three inner arc surfaces 11, and the inner wall of the connecting hole 5 has three outer arc surfaces 41. When the connecting shaft 1 is inserted into the connecting hole 5 and rotates in the same direction, the three outer arc surfaces 41 are tangent to the three inner arc surfaces 11 respectively, forming a three-point positioning structure. Specifically, three equally divided points are randomly selected on the first circle 10 to form the center of the outer arc surface 41 , and a single equally divided point is randomly selected on the second circle 20 to form the center of the inner arc surface 11 , thereby forming an eccentric structure of the outer arc surface 41 and the inner arc surface 11 .

[0033] The positioning connection structure of the present invention realizes high-precision connection between parts assembly, can achieve zero gap 51 and zero error of parts, is convenient and fast, especially for high-precision connection between long parts. The connection structure of the present application reduces the manufacturing precision requirements when connecting parts, is easy to manufacture, and can achieve high connection positioning precision without relying on the manufacturing tolerance control of the connecting part of the parts.

[0034] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A positioning connection structure, comprising a part 1 and a part 2, wherein the part 1 comprises a connecting shaft, and the part 2 is provided with a connecting hole, wherein the connecting shaft can be inserted into the connecting hole, and wherein: The side wall of the connecting shaft includes a plurality of inner arc surfaces, the inner wall of the connecting hole includes a plurality of outer arc surfaces, the connecting shaft can rotate relative to the connecting hole to a position where the plurality of inner arc surfaces are respectively tangent to the plurality of outer arc surfaces, and can prevent the connecting shaft from further rotating in the same direction relative to the connecting hole. The diameters of the plurality of inner arc surfaces are equal, and the centers thereof fall on a second circle, and the center of the second circle falls on the axis line of the connecting shaft; The diameters of the plurality of outer arc surfaces are equal, and the centers of the circles fall on a first circle. When the plurality of inner arc surfaces are tangent to the plurality of outer arc surfaces respectively, the center of the first circle falls on the axis of the connecting shaft, and the diameter of the second circle is greater than the diameter of the first circle. When the inner arc surface is tangent to the outer arc surface, the center of the inner arc surface, the center of the outer arc surface and the axis are not on the same straight line. The plurality of inner arc surfaces are arranged at intervals, and the space between two adjacent inner arc surfaces is the inner side surface. The side wall of the connecting shaft is formed by surrounding the plurality of inner arc surfaces and the plurality of inner side surfaces. The plurality of outer arc surfaces are arranged at intervals, and the adjacent two outer arc surfaces are the outer side surfaces. The inner wall of the connecting hole is formed by surrounding the plurality of outer arc surfaces and the plurality of outer side surfaces. The inner side surface is a planar structure, and the outer side surface is an arc surface structure protruding outward relative to the outer arc surface. The connecting hole portion surrounded by the outer side surface forms an escape space for accommodating the inner arc surface. When the inner arc surface of the connecting shaft and the outer side surface of the connecting hole are in a position close to each other, there is a gap between the inner arc surface and the outer side surface.

2. The positioning connection structure according to claim 1, characterized in that: The side wall of the connecting shaft has three inner arc surfaces, and the inner wall of the connecting hole has three outer arc surfaces. When the connecting shaft is inserted into the connecting hole and rotated in the same direction, the three outer arc surfaces are respectively tangent to the three inner arc surfaces to form a three-point positioning structure.

3. A tool assembly, characterized in that: The tool assembly has the positioning connection structure described in any one of claims 1 to 2, the first part is the tool head, and the second part is the tool rod.

4. The tool assembly according to claim 3, characterized in that: The tool head also includes a tool head body, the connecting shaft is arranged on the tool head body, the connecting shaft has a through hole, the through hole is coaxially arranged with the connecting shaft, the bottom of the connecting hole of the tool rod also has a threaded hole coaxially arranged with the connecting hole, and the tool assembly also includes a screw. When the connecting shaft is inserted into the connecting hole, the screw passes through the threaded hole and the through hole to connect the tool head with the tool rod.

5. A tool head, characterized in that: The tool head is part 1 as described in any one of claims 1 to 2.

6. A tool bar, characterized in that: The tool rod is part 2 as described in any one of claims 1 to 2.

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