Positioning fixture for lathe

Abstract

The positioning clamp for the lathe comprises a positioning disc, the positioning disc comprises a positioning disc body and a movable disc, and a plurality of limiting rods capable of moving in the radial direction of the positioning disc body are installed on the positioning disc body; a first mounting hole is formed in the center of the positioning disc body, the outer edge of the first mounting hole protrudes to form a hollow shaft body, the movable disc is arranged on the hollow shaft body in a sleeving mode, and an ejector rod is detachably arranged in the hollow shaft body in a penetrating mode. A plurality of radial strip-shaped holes are formed in the positioning disc body in the circumferential direction at equal intervals. A plurality of arc-shaped strip holes are distributed in the movable disc in the circumferential direction of the movable disc at equal intervals and extend in the direction away from the circle center of the movable disc. The positioning disc is simple in structure, and shaft parts are clamped and fixed through simple combination of the ejector rods and the positioning disc body; the movable disc is matched with the positioning disc body to clamp and fix the disc type workpiece, so that the production efficiency is improved, the production cost is reduced, the positioning error caused by manual workpiece clamping can be effectively reduced, and the manufacturing process is more controllable.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe processing equipment, and particularly relates to a positioning fixture for a lathe. Background Art

[0002] In traditional lathe processing, before processing shaft parts and disc parts, the parts to be processed need to be manually clamped by pushing. That is to say, the operator needs to push the part against the positioning surface of the three-jaw or fixture by hand and then clamp it. Such operations have the following defects: during the clamping process, the workpiece may not be firmly against the fixture; due to the heavy weight of the part, the workpiece may not be firmly against the fixture by relying on the thrust, which may cause inaccurate positioning of the part, and further lead to unqualified workpiece processing. In addition, when clamping with a three-jaw, due to the clamping position of the shaft, as well as the different shapes and centers of gravity of the workpiece, the workpiece and the fixture may not rotate concentrically during clamping, ultimately resulting in scrapped parts. Summary of the Utility Model

[0003] Aiming at the above defects and deficiencies in the prior art, the purpose of the present utility model is to provide a positioning fixture for a lathe to solve the technical problem of inaccurate part positioning caused by the uncertainty of manual pushing and clamping in the prior art.

[0004] To solve the above technical problem, the present utility model adopts the following technical solutions:

[0005] A positioning fixture for a lathe, comprising a positioning disc, the positioning disc includes a positioning disc body and a moving disc, and a plurality of limiting rods capable of moving radially along the positioning disc body are installed on the positioning disc body;

[0006] A first mounting hole is opened at the center of the positioning disc body, a hollow shaft body protrudes from the outer edge of the first mounting hole, the moving disc is sleeved on the hollow shaft body, and a ejector rod is detachably inserted through the hollow shaft body.

[0007] The present utility model further has the following technical features:

[0008] Specifically, a plurality of radial strip holes are also opened at equal intervals along the circumferential direction on the positioning disc body.

[0009] Furthermore, a plurality of arc-shaped strip holes are arranged at equal intervals along the circumferential direction of the moving disc, and the arc-shaped strip holes extend in the direction away from the center of the moving disc.

[0010] Furthermore, the number of the limiting rods, the radial strip holes and the arc-shaped strip holes is three, and the limiting rods are inserted through the strip holes and the arc-shaped strip holes.

[0011] Further, the hollow shaft body includes a side wall and a bottom plate which are connected and arranged, and a third mounting hole is formed in the bottom plate. The third mounting hole, the second mounting hole, and the first mounting hole can be coaxially communicated.

[0012] Further, the ejector rod includes a tip, a limiting portion, and a connecting portion which are integrally connected and arranged. A spring is sleeved on the connecting portion. One end of the spring is connected to the limiting portion, and the other end is connected to the bottom plate.

[0013] Further, the connecting portion passes through the third mounting hole and is threadedly connected to the first limiting nut.

[0014] Further, the limiting rod includes a limiting head and a rod body which are integrally connected and arranged. The limiting head is semi-circular. The rod body passes through the strip-shaped hole and the arc-shaped hole and is then threadedly connected to the second limiting nut.

[0015] The utility model has the following technical effects compared with the prior art:

[0016] The structure of the utility model is simple and convenient to adjust and use; the clamping and fixing of shaft parts can be realized through the simple combination of the ejector rod and the positioning disc body, and the clamping and fixing of disc workpieces can be realized through the cooperation of the moving disc and the positioning disc body, improving the processing qualification rate and production efficiency, reducing the production cost, effectively reducing the positioning error of manually clamping workpieces, and making the manufacturing process more controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a sectional view of the utility model

[0019] Figure 3 is a schematic diagram of the structure of the positioning disc body;

[0020] Figure 4 is a schematic diagram of the partial structure of the utility model;

[0021] Figure 5 is a schematic diagram of the structure of the moving disc;

[0022] Figure 6 is a schematic diagram of the structure of the ejector rod.

[0023] The reference numerals in the drawings represent:

[0024] 1 - positioning plate body, 2 - limiting rod, 3 - hollow shaft body, 4 - moving plate, 5 - ejector rod, 6 - spring, 7 - first limiting nut, 8 - second limiting nut; 11 - first mounting hole, 12 - radial strip hole; 21 - limiting head, 22 - rod body, 23 - limiting spring; 31 - side wall, 32 - bottom plate; 41 - second mounting hole, 42 - arc-shaped strip hole; 51 - tip, 52 - limiting part, 53 - connecting part; 321 - third mounting hole.

[0025] The following further elaborates on the specific content of the present utility model in conjunction with embodiments. Specific embodiments

[0026] The following provides specific embodiments of the present utility model. It should be noted that the present utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of this application falls within the protection scope of the present utility model.

[0027] When the present utility model describes directions, the directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Without contrary description, terms such as "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Unless otherwise specified, the components in the present utility model are commercially available.

[0030] Embodiment 1

[0031] Complying with the above technical solution, as Figure 1 and Figure 2 shown, this embodiment provides a positioning fixture for a lathe, including a positioning plate. The positioning plate includes a positioning plate body 1 and a moving plate 4. The moving plate 4 is a hollow plate body, and a plurality of limiting rods 2 capable of moving radially along the positioning plate body 1 are installed on the positioning plate body 1;

[0032] A first mounting hole 11 is formed in the center of the positioning disk body 1. A hollow shaft body 3 protrudes from the outer edge of the first mounting hole 11. A moving disk 4 is sleeved on the hollow shaft body 3, and a ejector rod 5 is detachably inserted through the hollow shaft body 3.

[0033] In this embodiment, the positioning disk body 1 and the hollow shaft body 3 are integrally connected. The inner cavity of the hollow shaft body 3 can be used to accommodate the ejector rod 5. The diameter of the positioning disk body 1 is 200 mm and the thickness is 5 mm.

[0034] As a preferred solution of this embodiment, as Figure 3 shown, a plurality of radial strip holes 12 are equidistantly arranged along the circumferential direction on the positioning disk body 1. The radial strip holes 12 are not communicated with the first mounting hole 11, and the radial strip holes 12 are arranged outside the first mounting hole 11. The limiting rod 2 can move radially along the positioning disk body 1 within the radial strip holes 12, and the width of the radial strip holes 12 is 10.2 mm.

[0035] As a preferred solution of this embodiment, as Figure 5 shown, a second mounting hole 41 is provided in the center of the moving disk 4, and a plurality of arc-shaped strip holes 42 are also equidistantly arranged along the circumferential direction on the moving disk 4. The arc-shaped strip holes 42 extend in a direction away from the center of the moving disk 4. The arc-shaped strip holes 42 are not communicated with the second mounting hole 41, and the arc-shaped strip holes 42 are arranged outside the second mounting hole 41. The limiting rod 2 can move within the arc-shaped strip holes 42.

[0036] As a preferred solution of this embodiment, the number of the limiting rods 2, the radial strip holes 12 and the arc-shaped strip holes 42 is three, and the limiting rods 2 are inserted through the strip holes 12 and the arc-shaped strip holes 42.

[0037] As a preferred solution of this embodiment, as Figure 4 shown, the hollow shaft body 3 includes a side wall 31 and a bottom plate 32 which are connected. A third mounting hole 321 is formed in the bottom plate 32, and the third mounting hole 321, the second mounting hole 41 and the first mounting hole 11 can be coaxially communicated.

[0038] As a preferred solution of this embodiment, as Figure 6As shown in the figure, the ejector rod 5 includes a center point 51, a limiting part 52, and a connecting part 53 that are integrally connected. A limiting step is formed at the connection between the limiting part 52 and the connecting part 53. A spring 6 is sleeved on the connecting part 53. One end of the spring 6 is connected to the limiting part 52, and the other end is connected to the bottom plate 32. The front end of the limiting part 52 passes through the first mounting hole 11, and the rear end is inserted into the hollow shaft body 3. By the expansion and contraction of the spring 6, the length of the limiting part 52 entering the hollow shaft body 3 can be adjusted. In this embodiment, the center point 51 is in the shape of a cone, and the cone angle of the cone is 60°. Both the limiting part 52 and the connecting part 53 are cylindrical, the outer diameter of the limiting part 52 is 30 mm, and the outer diameter of the connecting part 53 is 20 mm.

[0039] As a preferred solution of this embodiment, an external thread is provided at the tail end of the connecting part 53. The connecting part 53 passes through the third mounting hole 321 and is threadedly connected to the first limiting nut 7, thereby realizing the axial limit of the ejector rod 5.

[0040] As a preferred solution of this embodiment, the limiting rod 2 includes a limiting head 21 and a rod body 22 that are integrally connected. The limiting head 21 is semi-circular. The rod body 22 passes through the strip-shaped hole 12 and the arc-shaped strip hole 42 and is threadedly connected to the second limiting nut 8. In this embodiment, a limiting spring 23 is also sleeved on the rod body 22 between the limiting head 21 and the positioning plate body 1.

[0041] The using process of the present utility model is as follows:

[0042] When clamping a shaft-like component, the ejector rod 5 sleeved with the spring 6 is placed into the hollow shaft body 3. The connecting part 53 passes through the third mounting hole 321 and is threadedly connected to the first limiting nut. The center point 51 cooperates with the center point hole provided on the shaft-like component to realize the clamping and positioning of the shaft-like component.

[0043] When clamping and positioning a disc-like part, the ejector rod 5 does not need to be installed. The moving disc 4 is sleeved on the hollow shaft body 3 and is attached to the positioning disc body 1. The limiting rod 2 is passed through the strip-shaped hole 12 and the arc-shaped strip hole 42 and is threadedly connected to the second limiting nut 8. After the three limiting rods 2 are installed, the positioning fixture is installed on the turret. After the disc-like part is attached to the positioning disc body 1, the radial movement of the limiting rod 2 is realized by rotating the hollow shaft body 3, and the clamping and fixing of the disc-like part are completed.

[0044] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model; for those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for a lathe, comprising a positioning plate, characterized in that: The positioning disk comprises a positioning disk body (1) and a moving disk (4); a plurality of limiting rods (2) capable of moving radially along the positioning disk body (1) are mounted on the positioning disk body (1); A first mounting hole (11) is provided at the center of the positioning plate body (1), the outer edge of the first mounting hole (11) protrudes to form a hollow shaft body (3), the moving plate (4) is sleeved on the hollow shaft body (3), and a push rod (5) is detachably inserted into the hollow shaft body (3).

2. The positioning fixture for a lathe according to claim 1, characterized in that: The positioning plate body (1) is also provided with a plurality of radial strip-shaped holes (12) at equal intervals along the circumferential direction.

3. The positioning fixture for a lathe according to claim 2, characterized in that: A second mounting hole (41) is provided at the center of the movable disk (4), and a plurality of arc-shaped strip holes (42) are also arranged at equal intervals along the circumferential direction on the movable disk (4), wherein the arc-shaped strip holes (42) extend in a direction away from the center of the movable disk (4).

4. The positioning fixture for a lathe according to claim 3, characterized in that: The number of the limiting rods (2), the radial strip holes (12) and the arc-shaped strip holes (42) is three, and the limiting rods (2) are inserted into the radial strip holes (12) and the arc-shaped strip holes (42).

5. The positioning fixture for a lathe according to claim 4, characterized in that: The hollow shaft body (3) comprises a side wall (31) and a bottom plate (32) which are connected to each other. A third mounting hole (321) is provided on the bottom plate (32). The third mounting hole (321), the second mounting hole (41) and the first mounting hole (11) can be coaxially connected.

6. The positioning fixture for a lathe according to claim 5, characterized in that: The push rod (5) comprises a top end (51), a limiting portion (52) and a connecting portion (53) which are integrally connected. A spring (6) is sleeved on the connecting portion (53). One end of the spring (6) is connected to the limiting portion (52), and the other end is connected to the bottom plate (32).

7. The positioning fixture for a lathe according to claim 6, characterized in that: The rear end of the connecting portion (53) is provided with an external thread, and the connecting portion (53) passes through the third mounting hole (321) and is threadedly connected to the first limiting nut (7).

8. The positioning fixture for a lathe according to claim 3, characterized in that: The limiting rod (2) comprises a limiting head (21) and a rod body (22) which are integrally connected, the limiting head (21) is semicircular, and the rod body (22) is threadedly connected to the second limiting nut (8) after passing through the radial strip hole (12) and the arc strip hole (42).

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