Thimble tailstock device for lathe

Abstract

The utility model relates to a centre tailstock device for a lathe in the technical field of lathe tailstocks, which comprises a tailstock frame, a centre component and a driving structure arranged in the tailstock frame, the centre component comprises a centre sleeve, a centre piece and a mounting cover plate, and the centre sleeve and the mounting cover plate are both of hollow structures. The center piece is rotatably arranged in the center sleeve, the center sleeve is fixedly connected with the driving sleeve, one end of the center piece is a conical end of a conical structure, the inner wall of the mounting cover plate is of a conical surface structure matched with the center piece, and the conical end of the center piece is sleeved with the mounting cover plate. The center piece can be stably matched with a workpiece to rotate, the machined workpiece is effectively clamped with large force, and meanwhile the center assembly has the strength and rigidity capable of bearing large radial bearing force.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe tailstocks, in particular to an ejector tailstock device for a lathe. Background Art

[0002] A lathe is a machine tool that mainly uses a turning tool to turn a rotating workpiece. The tailstock of a lathe is mainly composed of a tailstock body, a cone-shaped ejector pin, a sleeve, a screw, etc. The main function of the lathe tailstock is to support the workpiece with the top of the ejector pin, and the other end cooperates with the spindle box to support the workpiece and withstand the cutting force.

[0003] In the prior art, when a lathe cuts a workpiece, the workpiece is fixed by using the chuck of the lathe head and the ejector assembly of the tailstock installed at the rear of the lathe. The tailstock center of the lathe is the reference bearing member for machine tool cutting, and has a certain bearing stiffness and strength. The center can be flexible and can be accurately positioned. The manufacturing accuracy of the tailstock center itself determines the processing and manufacturing accuracy of the product. When the existing end face precision is high, the center of the ejector assembly needs to cooperate with the workpiece for high rotation, and at the same time, it needs to have a large radial bearing capacity. Therefore, in view of these current situations, it is urgent to develop an ejector tailstock device for lathes to meet the needs of actual use. Utility Model Content

[0004] The utility model aims to provide a thimble tailstock device for a lathe, which is used to realize the clamping requirement that the thimble needs to cooperate with a workpiece to rotate at a high degree and has a large radial bearing force.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A thimble tailstock device for a lathe comprises a tailstock frame, an thimble assembly and a driving structure arranged inside the tailstock frame, wherein the top of the tailstock frame is an extension portion having a cylindrical middle structure, the driving structure comprises a driving sleeve, and the driving sleeve can be located in the extension portion for horizontal movement, the thimble assembly is rotatably arranged at one end of the driving sleeve, the thimble assembly comprises a top sleeve, a top piece and a mounting cover plate, both of the top sleeve and the mounting cover plate are hollow structures, the top piece is rotatably arranged inside the top sleeve, the top sleeve is fixedly connected to the driving sleeve, one end of the top piece is a conical end of a conical structure, the inner wall of the mounting cover plate is a conical surface structure matching the top piece, the mounting cover plate is sleeved on the conical end of the top piece, and the mounting cover plate is fixedly connected to the inside of one end of the top sleeve, and the conical end of the top piece is rotatably abutted against the inside of the mounting cover plate.

[0007] In the above description, as a further solution, a plurality of balls are provided on the conical end surface of the top piece, and the plurality of balls are rotatably embedded in the surface of the top piece, and the inner wall of the mounting cover plate is provided with an annular groove matching the balls, and when the mounting cover plate is in contact with the top sleeve, the balls are rotatably embedded in the annular groove.

[0008] In the above description, as a further solution, the outer wall of the mounting cover is provided with an external thread structure, and the inner wall of the top sleeve is provided with a matching internal thread structure, and the mounting cover is fixedly connected to the inner wall of the top sleeve by threads.

[0009] In the above description, as a further solution, a top mounting through hole is opened at one end of the driving sleeve close to the ejector assembly, and one end of the top piece away from the mounting cover plate extends to the inside of the top mounting through hole.

[0010] In the above description, as a further solution, a rotary bearing is provided inside the top mounting through hole, and when one end of the top piece extends into the top mounting through hole, the top piece conflicts with the rotary bearing.

[0011] In the above description, as a further solution, a top mounting assembly is provided between the top sleeve and the drive sleeve, and the top mounting assembly includes a fixing plate and a plurality of fixing bolts. The fixing plate is arranged on the surface between the top sleeve and the drive sleeve, and the fixing bolts respectively pass through both ends of the fixing plate and are threadedly connected with the top sleeve and the drive sleeve.

[0012] In the above description, as a further solution, the driving structure also includes a driving rod body and a handwheel. The handwheel is rotatably arranged on the side of the extension part away from the ejector assembly. A driving threaded through hole is provided at one end of the driving rod body away from the ejector mounting through hole. One end of the driving rod body is threadedly connected to the driving threaded through hole, and the other end of the driving rod body extends to one side of the extension part and is fixedly connected to the handwheel.

[0013] In the above description, as a further solution, a locking handle for locking the drive sleeve is provided at one end of the extension part close to the ejector pin assembly, a vertically arranged locking through hole is provided at one end of the extension part close to the top end, the locking handle is plugged into the locking through hole, and a horizontally arranged notch is provided at one end of the extension part close to the top end, and the notch passes through the middle of the extension part and the locking through hole.

[0014] The beneficial effects produced by the utility model are as follows:

[0015] The present invention discloses a thimble tailstock device for a lathe, in which a top piece is rotatably arranged inside a driving sleeve, and a mounting cover plate with a hollow structure is used to limit the horizontal position of the top piece, so that the top piece can stably rotate with a workpiece, and effectively clamp the workpiece with a relatively large force;

[0016] On the other hand, one end of the top piece is a conical end of a conical structure, and the inner wall of the mounting cover plate is a conical surface structure matching the top piece. The conical end of the top piece is rotatably abutted against the inside of the mounting cover plate, so that the ejector pin assembly has the strength and rigidity to withstand a larger radial load-bearing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of an ejector tailstock device for a lathe according to the utility model;

[0018] Figure 2 It is a side view structural schematic diagram of an ejector tailstock device for a lathe according to the utility model;

[0019] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0020] Figure 4 for Figure 3 A schematic diagram of the partially enlarged structure of B in the middle;

[0021] Figure 5 This is a schematic diagram of the structural breakdown of the ejector assembly being detached;

[0022] In the figure: 1-tailstock, 12-extension part, 13-locking through hole, 15-notch, 2-handwheel, 3-driving rod body, 4-driving sleeve, 41-top mounting through hole, 42-driving threaded through hole, 5-locking handle, 6-thimble assembly, 61-top sleeve, 62-top piece, 63-ball, 64-mounting cover, 7-rotating bearing, 8-top mounting assembly, 81-fixing plate, 82-fixing bolt. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0024] See also Figure 1-5The present invention specifically implements a tailstock device for a lathe, comprising a tailstock frame 1, an ejector assembly 6 and a driving structure arranged inside the tailstock frame 1. The top of the tailstock frame 1 is an extension portion 12 with a cylindrical middle structure. The driving structure comprises a driving sleeve 4. The driving sleeve 4 can be located in the extension portion 12 for horizontal movement. The ejector assembly 6 is rotatably arranged at one end of the driving sleeve 4. The ejector assembly 6 comprises a top sleeve 61, a top piece 62 and a mounting cover plate 64. The top sleeve 61 and the mounting cover plate 64 They are all hollow structures. The top piece 62 is rotatably arranged inside the top sleeve 61. The top sleeve 61 is fixedly connected to the driving sleeve 4. One end of the top piece 62 is a conical end of a conical structure. The inner wall of the mounting cover 64 is a conical surface structure matching the top piece 62. The mounting cover 64 is sleeved on the conical end of the top piece 62, and the mounting cover 64 is fixedly connected to the inside of one end of the top sleeve 61. The conical end of the top piece 62 is rotatably abutted against the inside of the mounting cover 64.

[0025] Specific as Figure 4 As shown, the conical end surface of the top piece 62 is provided with a plurality of balls 63, and the plurality of balls 63 can be rotatably embedded in the surface of the top piece 62, and the inner wall of the mounting cover plate 64 is provided with an annular groove matching the balls 63. When the mounting cover plate 64 abuts against the top sleeve 61, the balls 63 can be rotatably embedded in the annular groove. A rotary bearing 7 is provided inside the top mounting through hole 41. When one end of the top piece 62 extends to the inside of the top mounting through hole 41, the top piece 62 abuts against the rotary bearing 7. When the top piece 62 clamps the workpiece, the top piece 62 is pushed toward one side of the mounting cover plate 64 by the propulsion force of the driving structure. At this time, the balls 63 can be located between the conical end surface of the top piece 62 and the inner wall of the mounting cover plate 64, forming a contact structure with a low friction coefficient, so that the top piece 62 can stably cooperate with the workpiece for high-speed rotation.

[0026] Specific as Figure 4 As shown, the outer wall of the mounting cover plate 64 is provided with an external thread structure, and the inner wall of the top sleeve 61 is provided with a matching internal thread structure, the mounting cover plate 64 is threadedly fixedly connected with the inner wall of the top sleeve 61, and the end of the driving sleeve 4 close to the ejector assembly 6 is provided with a top mounting through hole 41, as shown in FIG. Figure 5 As shown, one end of the top member 62 away from the mounting cover plate 64 extends to the inside of the top mounting through hole 41;

[0027] The top piece 62 is rotatably arranged inside the driving sleeve 4, and the horizontal position of the top piece 62 is limited by the mounting cover plate 64 with a hollow structure, so that the top piece 62 can stably rotate with the workpiece and effectively maintain a relatively strong clamping force on the processed workpiece.

[0028] Specific as Figure 1and 4 As shown, a top mounting assembly 8 is provided between the top sleeve 61 and the driving sleeve 4. The top mounting assembly 8 includes a fixing plate 81 and a plurality of fixing bolts 82. The fixing plate 81 is arranged on the surface between the top sleeve 61 and the driving sleeve 4, and the fixing bolts 82 respectively pass through both ends of the fixing plate 81 and are threadedly connected with the top sleeve 61 and the driving sleeve 4.

[0029] Specific as Figure 3 As shown, the driving structure also includes a driving rod body 3 and a handwheel 2. The handwheel 2 is rotatably arranged on a side of the extension portion 12 away from the ejector assembly 6. A driving threaded through hole 42 is provided at one end of the driving rod body 3 away from the ejector mounting through hole 41. One end of the driving rod body 3 is threadedly connected to the driving threaded through hole 42, and the other end of the driving rod body 3 extends to one side of the extension portion 12 and is fixedly connected to the handwheel 2.

[0030] In a further embodiment, Figure 1-2 As shown, a locking handle 5 for locking the driving sleeve 4 is provided at one end of the extension portion 12 close to the ejector assembly 6, a vertically arranged locking through hole 13 is provided at one end of the extension portion 12 close to the top end, the locking handle 5 is plugged into the locking through hole 13, and a horizontally arranged notch 15 is provided at one end of the extension portion 12 close to the top end, and the notch 15 passes through the middle of the extension portion 12 and the locking through hole 13; after the driving sleeve 4 completes the adjustment of the horizontal position of the ejector assembly 6, the locking handle 5 is pulled to tighten the notch 15 in the middle of the locking through hole 13, and the inner wall of the locking through hole 13 is abutted and locked with the surface of the driving sleeve 4, thereby completing the positioning and locking of the ejector assembly 6 in the horizontal position.

[0031] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A thimble tailstock device for a lathe, comprising a tailstock frame, an thimble assembly and a driving structure arranged inside the tailstock frame, the top of the tailstock frame is an extension portion with a cylindrical middle structure, the driving structure comprises a driving sleeve, the driving sleeve can be located in the extension portion for horizontal movement, the thimble assembly is rotatably arranged at one end of the driving sleeve, and is characterized in that: The ejector pin assembly includes a top sleeve, a top piece and a mounting cover plate. Both the top sleeve and the mounting cover plate are hollow structures. The top piece is rotatably arranged inside the top sleeve. The top sleeve is fixedly connected to the driving sleeve. One end of the top piece is a conical end of a conical structure. The inner wall of the mounting cover plate is a conical surface structure matching the top piece. The mounting cover plate is sleeved on the conical end of the top piece, and the mounting cover plate is fixedly connected to the inside of one end of the top sleeve. The conical end of the top piece is rotatably abutted against the inside of the mounting cover plate.

2. The thimble tailstock device for a lathe according to claim 1, characterized in that: The conical end surface of the top piece is provided with a plurality of balls, which are rotatably embedded in the surface of the top piece, and the inner wall of the mounting cover is provided with an annular groove matching the balls. When the mounting cover is in contact with the top sleeve, the balls are rotatably embedded in the annular groove.

3. The thimble tailstock device for a lathe according to claim 1, characterized in that: The outer wall of the mounting cover plate is provided with an external thread structure, and the inner wall of the top sleeve is provided with a matching internal thread structure, and the mounting cover plate and the inner wall of the top sleeve are threadedly fixedly connected.

4. The thimble tailstock device for a lathe according to claim 1, characterized in that: A top installation through hole is formed at one end of the driving sleeve close to the ejector assembly, and an end of the top piece away from the installation cover plate extends to the inside of the top installation through hole.

5. The thimble tailstock device for a lathe according to claim 4, characterized in that: A rotary bearing is arranged inside the top installation through hole. When one end of the top piece extends into the top installation through hole, the top piece conflicts with the rotary bearing.

6. The thimble tailstock device for a lathe according to claim 1, characterized in that: A top installation assembly is provided between the top sleeve and the driving sleeve. The top installation assembly includes a fixing plate and a plurality of fixing bolts. The fixing plate is arranged on the surface between the top sleeve and the driving sleeve, and the fixing bolts pass through both ends of the fixing plate and are threadedly connected with the top sleeve and the driving sleeve.

7. The thimble tailstock device for a lathe according to any one of claims 1 to 6, characterized in that: The driving structure also includes a driving rod body and a handwheel. The handwheel is rotatably arranged on a side of the extension part away from the ejector assembly. A driving threaded through hole is provided at one end of the driving rod body away from the ejector mounting through hole. One end of the driving rod body is threadedly connected to the driving threaded through hole, and the other end of the driving rod body extends to one side of the extension part and is fixedly connected to the handwheel.

8. The thimble tailstock device for a lathe according to claim 6, characterized in that: The end of the extension part close to the ejector pin assembly is provided with a locking handle for locking the driving sleeve, the end of the extension part close to the top is provided with a vertically arranged locking through hole, the locking handle is plugged into the locking through hole, and the end of the extension part close to the top is provided with a horizontally arranged notch, which runs through the middle of the extension part and the locking through hole.

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