Small self-locking type hollow three-jaw centering clamp
By designing a small self-locking hollow three-jaw centering fixture, the automatic centering and clamping of workpieces is achieved by using a pneumatic device and a dovetail structure, which solves the problem of inconvenient operation of small workpieces and achieves a flexible and reliable clamping effect.
Patent Information
- Application Number
- CN202423286805.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing technologies make it inconvenient and inflexible to operate small and medium-sized workpieces when clamping them on the outer circle, and the clamping equipment is bulky and heavy.
A small, self-locking, hollow three-jaw centering fixture was designed. It adopts a hollow inner shell and outer shell structure. It uses a pneumatic device to drive the piston and the dovetail structure of the positioning jaws to achieve automatic centering, clamping and unclamping. The workpiece outer circle is reliably clamped by the guide column.
It achieves flexible and reliable clamping of small workpieces, adapts to a variety of workpieces, is easy to operate, has good self-locking properties, and a compact structure.
Smart Images
Figure CN223670241U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a small self -locking hollow three -jaw centering fixture, it is mainly used for clamping small in machining and has the work piece of clamping through the outside circle. BACKGROUND
[0002] At present, in the machining industry clamping work piece, especially small and through the outside circle clamping work piece has the following problems: it is cumbersome, big in size, inconvenient to operate when clamping, poor flexibility. SUMMARY
[0003] The utility model discloses a small self -locking hollow three -jaw centering fixture, including the inner shell of hollow structure and the outer shell of being sleeved in the inner shell outside, be equipped with the piston between the inner shell and the outer shell, the lower chamber and the upper chamber are formed between the outer side of piston and the inner side of outer shell, the lower chamber is linked together with the air hole on the outer shell of upper chamber respectively, and the upper cover is fixedly connected with screw on the upper end surface of inner shell, and three setting claws that set up along the radial direction of inner shell are evenly distributed with the circumferential direction on the upper portion of inner shell, and the sleeve is sleeved with the outer side of setting claw, and the sleeve is fixed in the radial hole on the inner shell, and the guide column is fixed on the inner shell and the sleeve, and the end of guide column inserts into the longitudinal long slot on setting claw, and the upper end of piston and the end of setting claw bevel surface contact and be mutually between swallow -tail groove connecting structure, and the lower end outer side periphery of inner shell is inserted with the mounting bolt for installation on the outer shell.
[0004] The upper portion of piston is sleeved with the piston sleeve, and the piston sleeve is fixedly connected between the inner shell and the outer shell, and the lower chamber is surrounded by the piston, the piston sleeve and the outer shell.
[0005] The small self -locking hollow three -jaw centering fixture of the utility model is installed on the workbench through the mounting bolt, and the air hole on the outer shell that is communicated with the upper chamber and the lower chamber is connected with the pneumatic device, and the pneumatic device drives the piston to move up when clamping work piece, and the swallow -tail structure on the inclined surface that the piston and setting claw contact pushes setting claw to move to the inner side of inner shell, and the guide column plays a guiding role, and the inner end head of setting claw clamps the outside circle of work piece, and when the pneumatic device reversely drives the piston, the piston moves down, and setting claw is pulled back to position through the swallow -tail structure, and the clamping of work piece is released. BRIEF DESCRIPTION OF DRAWINGS
[0006] Figure 1 It is the sectional view schematic diagram of the specific embodiment of the utility model. DETAILED DESCRIPTION
[0007] As Figure 1The utility model discloses a small self-locking hollow three-jaw centering fixture, which comprises an inner shell 1 with a hollow structure and an outer shell 9 sleeved on the outer side of the inner shell 1, and a piston 3 is arranged between the inner shell 1 and the outer shell 9.
[0008] The upper end faces of the inner shell 1 and the outer shell 9 are fixedly connected with an upper cover 5 through screws.
[0009] Three positioning claws 4 are uniformly distributed on the upper portion of the inner shell 1 along the circumferential direction and are arranged along the radial direction of the inner shell 1, a sleeve 8 is sleeved on the outer side of the positioning claw 4, the sleeve 8 is fixed in the radial hole on the inner shell 1, a guide column 6 is fixed on the inner shell 1 and the sleeve 8, and the end of the guide column 6 is inserted into the longitudinal long slot on the positioning claw 4.
[0010] The upper end of the piston 3 is in contact with the end face of the positioning claw 4 and is connected with each other in a dovetail groove structure.
[0011] The lower end of the outer side of the inner shell 1 is provided with mounting bolts 10 for mounting on the upper end of the outer shell 9.
[0012] The upper portion of the outer side of the piston 3 is sleeved with a piston sleeve 11, the piston sleeve 11 is fixedly connected between the inner shell 1 and the outer shell 9, and the lower cavity 12 is surrounded by the piston 3, the piston sleeve 11 and the outer shell 9.
[0013] The small self-locking hollow three-jaw centering fixture is mounted on a workbench through the mounting bolts 10, the air inlet and outlet holes on the outer shell 9, which are in communication with the upper cavity 13 and the lower cavity 12, are connected with a pneumatic device, the pneumatic device drives the piston 3 to move upward when clamping the workpiece 7, the dovetail structure on the inclined surface, which is in contact between the piston 3 and the positioning claw 4, pushes the positioning claw 4 to move inward to the inner side of the inner shell 1, the guide column 6 plays a guiding role, the inner end of the positioning claw 4 clamps the outer circle of the workpiece 7, the piston 3 moves downward when the pneumatic device reversely drives the piston 3, the positioning claw 4 is pulled back to the original position through the dovetail structure, and the clamping of the workpiece 7 is released. The small self-locking hollow three-jaw centering fixture has the advantages of compact overall structure, small size, adaptability to various small outer circle clamped workpieces, automatic centering clamping, flexibility and reliability, good self-locking performance and simple operation.
Claims
1. A compact self-locking hollow three-jaw centering fixture, characterized in that: The inner casing (1) including hollow structure and the outer casing (9) being sleeved outside the inner casing (1), the piston (3) is arranged between the inner casing (1) and the outer casing (9), the lower cavity (12) and the upper cavity (13) are formed between the outer side of the piston (3) and the inner side of the outer casing (9), the lower cavity (12) and the upper cavity (13) are communicated with the air inlet and outlet holes on the outer casing (9) respectively, the upper cover (5) is fixed and connected on the upper end face of the inner casing (1) and the outer casing (9) through screws, three positioning claws (4) are uniformly distributed on the upper portion of the inner casing (1) along the circumferential direction and are arranged along the radial direction of the inner casing (1), the sleeve (8) is sleeved outside the positioning claws (4), the sleeve (8) is fixed in the radial hole on the inner casing (1), the guide column (6) is fixed on the inner casing (1) and the sleeve (8), the end of the guide column (6) is inserted into the longitudinal long slot on the positioning claw (4), the upper end of the piston (3) is in contact with the end surface of the positioning claw (4) and is connected in dovetail groove structure, the mounting bolt (10) is inserted and mounted on the outer side of the lower end of the inner casing (1) and the upper end of the outer casing (9) for mounting.
2. The compact self-locking hollow three-jaw centering chuck according to claim 1, characterized in that: The piston sleeve (11) is sleeved outside the upper portion of the piston (3), the piston sleeve (11) is fixedly connected with the inner casing (1) and the outer casing (9), and the lower cavity (12) is surrounded by the piston (3), the piston sleeve (11) and the outer casing (9).