Lathe internal expansion type clamp

Abstract

The utility model provides an internal expansion type clamp for a lathe, which relates to the technical field of clamps and comprises a lathe spindle, one side of the lathe spindle is in threaded connection with a fixing bolt, one end of the fixing bolt is in threaded connection with a conical part, one side of the conical part is abutted against one side of the lathe spindle, and a rubber expansion sleeve is arranged on the outer side of the conical part. According to the utility model, the movable rod is pulled to drive the rubber expansion sleeve to move, and the rubber expansion sleeve moves on the inclined surface of the conical part, so that the rubber expansion sleeve is outwards expanded and deformed, the outer diameter of the rubber expansion sleeve is increased, a workpiece is tightly supported, and the precision of the clamp can be accurately controlled through the close fit between the rubber expansion sleeve and the conical part; the spring is arranged outside the backward pulling screw, in the process that the rubber expansion sleeve moves on the inclined face of the conical piece, the spring is compressed, the contact resistance between the rubber expansion sleeve and the inner wall of the workpiece is increased, and the rubber expansion sleeve can prevent the pipe wall of the workpiece from deforming while tightly supporting the workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to an internal expansion clamp for a lathe. Background Art

[0002] An internal expansion clamp is a tool used to clamp workpieces. It is often used in mechanical processing, especially in processes such as assembly, cutting and drilling. Its working principle is to use the combined effect of air pressure and mechanical structure to expand the internal air bag to achieve the purpose of clamping the workpiece. After clamping, the air pressure can be controlled to shrink the air bag, thereby loosening the workpiece.

[0003] In the prior art, when the internal expansion clamp is used, since the workpiece is mostly a tubular structure, it is impossible to accurately position and clamp the workpiece. The workpiece is easily loosened or deformed during the clamping process, resulting in the workpiece after processing not meeting the requirements. Utility Model Content

[0004] The utility model mainly provides an internal expansion clamp for a lathe which is convenient for improving the clamp accuracy and preventing the deformation of a workpiece.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lathe internal expansion clamp comprises a lathe spindle, one side of the lathe spindle is threadedly connected with a fixing bolt, one end of the fixing bolt is threadedly connected with a tapered part, one side of the tapered part abuts against one side of the lathe spindle, a rubber expansion sleeve is arranged on the outside of the tapered part, a back-pull assembly is arranged on the inside of the tapered part, the outside of the back-pull assembly abuts against one end of the rubber expansion sleeve, a back-pull screw is arranged on one side of the back-pull assembly, a spring is sleeved on the outside of the back-pull screw, a back-pull block is arranged on one end of the spring, and the back-pull block is installed on the outside of the back-pull screw. The rubber sleeve is a cylindrical body that is pressed against the outer surface of the rubber sleeve and is pressed against the outer surface of the rubber sleeve to form a circle around the workpiece. The rubber sleeve is pressed against the outer surface of the rubber sleeve and is pressed against the workpiece. The rubber sleeve is pressed against the outer surface of the rubber sleeve to form a circle around the workpiece. The rubber sleeve is pressed against the outer surface of the rubber sleeve to form a circle around the workpiece.

[0006] Preferably, a moving rod is provided in the middle of the lathe spindle, and a back-pulling screw sleeve is provided on one side of the moving rod, and the moving rod and the back-pulling screw sleeve are fixed to drive the back-pulling screw sleeve to move when the moving rod moves.

[0007] Preferably, an outer ring at one end of the moving rod is provided with an external thread, and an inner ring at one end of the rear pull screw sleeve is provided with an internal thread. One end of the moving rod is threadedly connected to one end of the rear pull screw sleeve. The threaded connection between the moving rod and the rear pull screw sleeve facilitates fixing the rear pull screw sleeve on the moving rod.

[0008] Preferably, one side of the rear pull block is movably connected with a height bolt, one end of which is threadedly connected to one side of the rear pull assembly, so that the rear pull block can be fixedly installed on the rear pull assembly through the height bolt.

[0009] Preferably, the two ends of the spring are respectively in contact with one side of the rear pull block and one end of the rear pull screw. By arranging a spring on the outside of the rear pull screw, the spring is compressed when the rubber expansion sleeve moves on the inclined surface of the cone, and the resistance between the rubber expansion sleeve and the inner wall of the workpiece becomes larger.

[0010] Compared with the prior art, the advantages and positive effects of the utility model are:

[0011] 1. In the utility model, by pulling the movable rod, the rubber expansion sleeve is driven to move, and the rubber expansion sleeve moves on the inclined surface of the tapered part, so that the rubber expansion sleeve is expanded and deformed outward, and the outer diameter of the rubber expansion sleeve becomes larger, thereby tightening the workpiece. Through the close cooperation between the rubber expansion sleeve and the tapered part, the accuracy of the fixture can be accurately controlled.

[0012] 2. In the utility model, a spring is arranged on the outside of the pull-back screw rod. When the rubber expansion sleeve moves on the inclined surface of the conical part, the spring is compressed, and the resistance between the rubber expansion sleeve and the inner wall of the workpiece becomes larger, so that the rubber expansion sleeve can prevent the workpiece tube wall from deforming while supporting the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of an internal expansion clamp for a lathe is provided for the utility model;

[0014] Figure 2 The utility model provides a side view disassembly structure diagram of a lathe internal expansion clamp;

[0015] Figure 3 The utility model provides a schematic diagram of a spring connection structure of an internal expansion clamp of a lathe;

[0016] Figure 4 The utility model provides a planar structural schematic diagram of an internal expansion clamp for a lathe.

[0017] Legend: 1. Lathe spindle; 2. Tapered part; 3. Pull-back screw; 4. Rubber expansion sleeve; 5. Pull-back screw sleeve; 6. Pull-back block; 7. Spring; 8. Equal height bolt; 9. Pull-back assembly; 10. Fixing bolt; 11. Moving rod. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] See also Figure 1-Figure 4 The utility model provides a technical solution: an internal expansion clamp for a lathe, comprising a lathe spindle 1, a fixing bolt 10 is threadedly connected to one side of the lathe spindle 1, a conical member 2 is threadedly connected to one end of the fixing bolt 10, one side of the conical member 2 abuts against one side of the lathe spindle 1, a rubber expansion sleeve 4 is arranged on the outer side of the conical member 2, a back-pull component 9 is arranged on the inner side of the conical member 2, the outer side of the back-pull component 9 abuts against one end of the rubber expansion sleeve 4, a back-pull screw 3 is arranged on one side of the back-pull component 9, a spring 7 is sleeved on the outside of the back-pull screw 3, a back-pull block 6 is arranged on one end of the spring 7, and the back-pull block 6 is installed on the outside of the back-pull screw 3. One end of the back-pull screw 3 is installed in the middle of the back-pull screw sleeve 5, and the workpiece is sleeved on the outside of the rubber expansion sleeve 4. By pulling the moving rod 11, the back-pull screw 3, the back-pull assembly 9 and the rubber expansion sleeve 4 are driven to move in turn. The rubber expansion sleeve 4 moves on the inclined surface on the tapered part 2, and the rubber expansion sleeve 4 is stretched and deformed outward. The outer diameter of the rubber expansion sleeve 4 increases, and the spring 7 is compressed. When the rubber expansion sleeve 4 is deformed to contact the inner wall of the workpiece, the resistance increases, and the back-pull assembly 9 stops moving, thereby tightening the workpiece through the deformation of the rubber expansion sleeve 4. The rubber expansion sleeve 4 and the tapered part 2 are closely matched to accurately control the accuracy. At the same time, by setting the spring 7, the rubber expansion sleeve 4 can tighten the workpiece while avoiding deformation of the workpiece tube wall.

[0021] like Figure 2 and Figure 4 As shown, a moving rod 11 is provided in the middle of the lathe spindle 1, and a back-pull screw sleeve 5 is provided on one side of the moving rod 11. The moving rod 11 is fixed to the back-pull screw sleeve 5, and the back-pull screw sleeve 5 is driven to move when the moving rod 11 moves.

[0022] like Figure 2 and Figure 4As shown, an outer circle at one end of the moving rod 11 is provided with an external thread, and an inner circle at one end of the rear pull screw sleeve 5 is provided with an internal thread. One end of the moving rod 11 is threadedly connected to one end of the rear pull screw sleeve 5. Through the threaded connection between the moving rod 11 and the rear pull screw sleeve 5, it is convenient to fix the rear pull screw sleeve 5 on the moving rod 11.

[0023] like Figure 3 and Figure 4 As shown, one side of the rear pull block 6 is movably connected with an equal height bolt 8, and one end of the equal height bolt 8 is threadedly connected to one side of the rear pull component 9, so that the rear pull block 6 can be fixedly installed on the rear pull component 9 through the equal height bolt 8.

[0024] like Figure 3 and Figure 4 As shown, the two ends of the spring 7 are respectively in contact with one side of the rear pull block 6 and one end of the rear pull screw 3. By arranging the spring 7 on the outside of the rear pull screw 3, when the rubber expansion sleeve 4 moves on the inclined surface of the cone 2, the spring 7 is compressed, and the resistance between the rubber expansion sleeve 4 and the inner wall of the workpiece becomes larger.

[0025] The usage and working principle of this device are as follows: first, an outer thread is set on the outer ring of one end of the moving rod 11, and an inner thread is set on the inner ring of one end of the back-pull screw sleeve 5. The back-pull screw sleeve 5 is threadedly connected to the moving rod 11, and the tapered part 2 is fixed to the lathe spindle 1 by the fixing bolt 10, so that one side of the tapered part 2 is tightly fitted with one side of the lathe spindle 1, and then the rubber expansion sleeve 4 is installed on the outside of the back-pull component 9, and the spring 7 is sleeved on the outside of the back-pull screw 3, and one end of the spring 7 abuts against one end of the back-pull screw 3, and the back-pull block 6 is sleeved on the outside of the back-pull screw 3, and the other end of the spring 7 abuts against one side of the back-pull block 6, and the equal-height bolt 8 is passed through one side of the back-pull block 6 and threadedly connected to one side of the back-pull component 9, so that the back-pull screw 3 and the back-pull component 9 are assembled, and the tapered part 2 is inserted into the In the cavity between the back-pulling component 9 and the rubber expansion sleeve 4, the back-pulling screw 3 is fixedly installed in the middle of the back-pulling screw sleeve 5, thereby completing the assembly of a lathe internal expansion clamp, and the workpiece is sleeved on the outside of the rubber expansion sleeve 4. By pulling the moving rod 11, the back-pulling screw 3, the back-pulling component 9 and the rubber expansion sleeve 4 are driven to move in turn. The rubber expansion sleeve 4 moves on the inclined surface on the tapered part 2, and the rubber expansion sleeve 4 is stretched and deformed outward. The outer diameter of the rubber expansion sleeve 4 increases, and the spring 7 is compressed. When the rubber expansion sleeve 4 is deformed to contact with the inner wall of the workpiece, the resistance increases, and the back-pulling component 9 stops moving, thereby tightening the workpiece through the deformation of the rubber expansion sleeve 4. The rubber expansion sleeve 4 and the tapered part 2 are closely matched to accurately control the accuracy. At the same time, by setting the spring 7, the rubber expansion sleeve 4 can tighten the workpiece while avoiding deformation of the workpiece tube wall.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A lathe internal expansion clamp, comprising a lathe spindle (1), characterized in that: A fixing bolt (10) is threadedly connected to one side of the lathe spindle (1), and a conical member (2) is threadedly connected to one end of the fixing bolt (10). One side of the conical member (2) is in contact with one side of the lathe spindle (1). A rubber expansion sleeve (4) is arranged on the outer side of the conical member (2). A pull-back assembly (9) is arranged on the inner side of the conical member (2). The outer side of the pull-back assembly (9) is in contact with one end of the rubber expansion sleeve (4). A pull-back screw (3) is arranged on one side of the pull-back assembly (9). A spring (7) is sleeved on the outside of the pull-back screw (3). A pull-back block (6) is arranged on one end of the spring (7). The pull-back block (6) is installed on the outside of the pull-back screw (3), and one end of the pull-back screw (3) is installed in the middle of the pull-back screw sleeve (5).

2. The lathe internal expansion clamp according to claim 1, characterized in that: A moving rod (11) is arranged in the middle of the lathe spindle (1), and a back-pulling screw sleeve (5) is arranged on one side of the moving rod (11).

3. The lathe internal expansion clamp according to claim 2, characterized in that: An outer ring at one end of the moving rod (11) is provided with an external thread, an inner ring at one end of the rear pull screw sleeve (5) is provided with an internal thread, and one end of the moving rod (11) is threadedly connected to one end of the rear pull screw sleeve (5).

4. The lathe internal expansion clamp according to claim 1, characterized in that: One side of the rear pull block (6) is movably connected to a height-equalizing bolt (8), and one end of the height-equalizing bolt (8) is threadedly connected to one side of the rear pull assembly (9).

5. The lathe internal expansion clamp according to claim 1, characterized in that: The two ends of the spring (7) are respectively in contact with one side of the rear pull block (6) and one end of the rear pull screw rod (3).

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