CN220825696U

CN220825696U - Automatic centering fixture

Info

Publication number: CN220825696U
Application number: CN202322704858.3U
Authority: CN
Inventors: 曾富洪
Original assignee: Panzhihua University
Current assignee: Panzhihua University
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-04-23
Anticipated expiration: 2033-10-07

Abstract

The utility model discloses an automatic centering clamp in the field of tool clamps, which comprises a base, a left clamp body, a right clamp body and a locking mechanism, wherein the left clamp body, the right clamp body and the locking mechanism are arranged on the base, the left clamp body and the right clamp body are oppositely arranged, a V-shaped clamp block with opposite openings is respectively arranged on the opposite surfaces of the left clamp body and the right clamp body, the left clamp body is fixed on the base, the right clamp body is slidably arranged on the base, the locking mechanism comprises an eccentric disc which is rotatably arranged on the base, the eccentric disc is positioned on one side, far from the left clamp body, of the right clamp body, and the eccentric disc can drive the right clamp body to slide towards the left clamp body when the eccentric disc is rotated. According to the utility model, the two left clamp bodies and the two right clamp bodies which can slide relatively are arranged on the base, the workpiece is clamped by the V-shaped clamp blocks which are arranged on the two clamp bodies relatively, the two clamp bodies are locked by the eccentric disc, the structure is simple, the operation is convenient, the two V-shaped clamp blocks can realize automatic centering of the workpiece, and the clamping precision and stability are ensured.

Description

Automatic centering fixture

Technical Field

The utility model relates to the field of tool clamps, in particular to an automatic centering clamp.

Background

The clamp is a device for clamping a workpiece rapidly, conveniently and safely. When milling, punching, slotting and other processing operations are carried out on the end face and the cylindrical surface of the cylindrical workpiece by a milling machine, the axial lead of the cylindrical workpiece is usually used as a process reference. The traditional clamp is used for centering by utilizing a milling machine tool setting device after workpiece clamping is completed, and in order to improve machining efficiency, the clamp is required to be automatically centered during clamping. At present, a three-jaw chuck is often used for clamping a cylindrical workpiece, and in particular, reference can be made to the Chinese utility model 'an automatic centering three-jaw chuck' with a patent number ZL 202021328194.5. The chuck is mainly used for lathes, requires a transition disc and has a complex structure. At present, a centering fixture for a milling machine is mainly used for specific workpieces, has weak universality, and increases production cost if a fixture with multiple dimensions is additionally arranged, so that a self-centering milling machine fixture with simple structure, strong universality, accurate positioning, stable clamping and high efficiency is needed.

Disclosure of utility model

In order to overcome the defects that the existing three-jaw chuck and other positioning fixtures are complex in structure and not suitable for milling machines and the like, the utility model aims to solve the technical problems that: the self-centering clamp is simple in structure, high in universality and accurate and stable in positioning.

The technical scheme adopted for solving the technical problems is as follows:

The automatic centering clamp comprises a base, a left clamp body, a right clamp body and a locking mechanism, wherein the left clamp body, the right clamp body and the locking mechanism are arranged on the base, the left clamp body and the right clamp body are oppositely arranged, V-shaped clamping blocks with opposite openings are respectively arranged on opposite surfaces of the left clamp body and the right clamp body, the left clamp body is fixed on the base, the right clamp body is arranged on the base in a sliding manner, the locking mechanism comprises an eccentric disc which is arranged on the base in a rotating manner, the eccentric disc is positioned on one side, far away from the left clamp body, of the right clamp body, and when the eccentric disc is rotated, the eccentric disc can drive the right clamp body to slide towards the left clamp body, so that a workpiece is clamped between the two V-shaped clamping blocks, and self-locking is realized through friction force between the eccentric disc and the right clamp body.

Further, a plurality of mounting holes are formed in the periphery of the base, and the base can be fixed to a working platform of the milling machine through the mounting holes.

Further, the opposite surfaces of the left clamp body and the right clamp body are respectively provided with a mounting groove arranged along the vertical direction, two sides of the mounting groove are provided with through holes, the V-shaped clamp blocks are mounted in the mounting grooves, screw holes are formed in positions corresponding to the through holes, and the two V-shaped clamp blocks are respectively fixed on the left clamp body and the right clamp body through screws penetrating through the through holes.

Further, two parallel guide plates are arranged in the middle of the base, a dovetail-shaped guide groove is formed in the middle of the two guide plates, the left clamp body is fixed at the left end of the guide groove, and the right clamp body is slidably arranged in the guide groove through a sliding part matched with the guide groove.

Further, a sunken limiting groove is formed in the base at a position corresponding to the guide groove, two ends of the limiting groove are flush with two ends of the guide plate, and the right clamp body is limited to slide in the limiting groove.

Further, the left clamp body and the right clamp body are connected together through the screw rod and the nut at the two ends deviating from each other, the spring is connected to the screw rod in a penetrating way, and the two ends of the spring are respectively abutted to the left clamp body and the right clamp body.

Further, a stud is arranged at the position of the base, which is used for installing the eccentric disc, and the eccentric disc is rotatably arranged on the stud and is limited to rotate on the stud through a locking nut.

Further, a rotating handle is arranged on the side face of the eccentric disc.

The beneficial effects of the utility model are as follows: the left clamp body and the right clamp body which can slide relatively are arranged on the base, the workpiece is clamped by the V-shaped clamp blocks which are arranged on the two clamp bodies relatively, the two clamp bodies are locked by the eccentric disc, the structure is simple, the operation is convenient, the two V-shaped clamp blocks can realize automatic centering of the workpiece, the clamping precision and stability are ensured, and the clamping device is suitable for clamping and fixing cylindrical workpieces by various plane processing machine tools.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a top view of the structure of the present utility model;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional view B-B of FIG. 2;

The drawing is marked as 1-base, 2-left clamp body, 3-right clamp body, 4-V-shaped clamp block, 5-eccentric disc, 6-workpiece, 7-screw, 8-nut, 9-spring, 11-mounting hole, 12-guide plate, 13-limit groove, 14-stud, 21-mounting groove, 22-screw, 51-locking nut and 52-rotating handle.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

In the present utility model, directional terms such as up, down, left, right, front, rear, and azimuth are used to facilitate the description of the relative positional relationship between the members, and are not meant to refer specifically to the absolute position of the relative member or the inter-member relationship, but are used only to explain the relative positional relationship, movement, and the like between the members in a specific posture, and if the specific posture is changed, the directional terms are changed accordingly. In the present utility model, the terms "plurality", "a plurality" and the like refer to two or more.

As shown in fig. 1-4, the self-centering clamp of the utility model comprises a base 1, a left clamp body 2, a right clamp body 3 and a locking mechanism, wherein the left clamp body 2, the right clamp body 3 and the locking mechanism are positioned on the base 1, the left clamp body 2 and the right clamp body 3 are oppositely arranged, each of opposite surfaces of the left clamp body 2 and the right clamp body is provided with a V-shaped clamp block 4 with opposite openings, the left clamp body 2 is fixed on the base 1, the right clamp body 3 is slidably arranged on the base 1, the sliding direction of the right clamp body is close to or far from the left clamp body 2, the locking mechanism comprises an eccentric disc 5 rotatably arranged on the base 1, the eccentric disc 5 is positioned on one side of the right clamp body 3 far from the left clamp body 2, and when the eccentric disc 5 is rotated, the eccentric disc 5 can drive the right clamp body 3 to slide to the left clamp body 2, so that a workpiece 6 is clamped between the two V-shaped clamp blocks 4, and self-locking is realized through friction force of the eccentric disc 5 and the right clamp body 3.

The working process of the utility model is as follows: firstly, a base is fixed on a working platform of a machine tool, then a cylindrical workpiece 6 to be processed is placed between two V-shaped clamping blocks 4, finally, an eccentric disc 5 is rotated, the right clamp body 3 is pushed to the left clamp body 2 in the rotation process of the eccentric disc 5 until the two V-shaped clamping blocks 4 clamp the workpiece 6, centering fixation is achieved, and under the action of friction force, the eccentric disc 5 and the right clamp body 3 form self-locking, so that the clamping stability is ensured.

In order to facilitate the fixing of the base 1 to the machine tool, a plurality of mounting holes 11 are provided at the periphery of the base 1, and the base 1 can be fixed to the working platform of the milling machine through the mounting holes 11.

As shown in fig. 4, the surface of the left clamp body 2 opposite to the surface of the right clamp body 3 are respectively provided with a mounting groove 21 arranged along the vertical direction, two sides of the mounting groove 21 are provided with through holes, the V-shaped clamp block 4 is arranged in the mounting groove 21, the position corresponding to the through holes is provided with screw holes, and the two V-shaped clamp blocks 4 are respectively fixed on the left clamp body 2 and the right clamp body 3 through screws 22 penetrating through the through holes. In the actual use process, various V-shaped clamping blocks 4 with different opening angles can be arranged, and for workpieces 6 with different sizes, the corresponding V-shaped clamping blocks 4 are replaced, so that the V-shaped surface is used for being contacted with the workpieces 6 as much as possible, instead of the opening end parts of the V-shaped grooves, and the clamping stability is ensured while the surface of the workpieces 6 is prevented from being scratched.

For the sliding connection of the right clamp body 3 and the base 1, the utility model adopts the preferable scheme that two parallel guide plates 12 are arranged in the middle of the base 1, a dovetail-shaped guide groove with a dovetail-shaped section is formed in the middle of the two guide plates 12, the left clamp body 2 is fixed at the left end of the guide groove, and the right clamp body 3 is arranged in the guide groove in a sliding manner through a sliding part matched with the guide groove. The guide groove is provided in a dovetail shape so as to restrict the right clamp body 3 from sliding in the guide groove without being separated from the base 1 in the vertical direction.

Further, in order to limit the sliding position of the right clamp body 3 on the base 1, a sunken limit groove 13 is provided at a position corresponding to the guide groove on the base 1, two ends of the limit groove 13 are flush with two ends of the guide plate 12, and as shown in fig. 3, the limit groove 13 can limit the right clamp body 3 to slide left and right in the limit groove 13.

In order to reduce the rotation amount of the eccentric disc 5 when the workpiece 6 with the same size is repeatedly clamped, two ends of the left clamp body 2, which are away from the right clamp body 3, can be connected together through a screw rod 7 and a nut 8, a spring 9 is connected to the screw rod 7 in a penetrating way, and two ends of the spring 9 are respectively abutted to the left clamp body 2 and the right clamp body 3. The initial distance between the left clamp body 2 and the right clamp body 3 can be adjusted by adjusting the screw rod 7 and the nut 8, the initial position of the right clamp body 3 in a natural state is ensured under the action of the spring 9, and the eccentric disc 5 can be rotated to be abutted against the right clamp body 3, so that the initial position of the eccentric disc 5 is taken as the initial position. The initial position enables the distance between the two V-shaped clamping blocks 4 to meet the requirement that the clamped workpiece 6 can be just placed, after the workpiece 6 is placed, the workpiece 6 can be locked by only slightly rotating the eccentric disc 5, and when the workpiece is loosened, the eccentric disc 5 is only slightly reversely rotated, so that the clamping efficiency is improved.

For the installation mode of the eccentric disc 5, the utility model adopts the structure that the stud 14 is arranged on the base 1 at the position for installing the eccentric disc 5, and the eccentric disc 5 is rotatably arranged on the stud 14 and is limited to rotate on the stud 14 through the locking nut 51. Under normal conditions, the locking nut 51 does not press the eccentric disc 5, so that the eccentric disc 5 can freely rotate around the stud 14; for parts needing long-time clamping, after the eccentric disc 5 is locked, the locking nut 51 can be rotated by a spanner to clamp and fix the eccentric disc 5, so that the eccentric disc 5 is prevented from loosening caused by long-term processing or false touch. Further, in order to facilitate the rotation of the eccentric disc 5, a rotation handle 52 is provided at a side surface of the eccentric disc 5.

Claims

1. Automatic centering fixture, characterized by: including base (1) to and be located left anchor clamps body (2), right anchor clamps body (3) and locking mechanism on base (1), left side anchor clamps body (2) set up with right anchor clamps body (3) relatively, and respectively be equipped with V type clamp splice (4) that an opening is relative on the opposite face between them, left side anchor clamps body (2) are fixed on base (1), and right anchor clamps body (3) slide and set up on base (1), locking mechanism is including rotating eccentric disc (5) that set up on base (1), and eccentric disc (5) are located one side that left anchor clamps body (2) was kept away from to right anchor clamps body (3), and when rotating eccentric disc (5), eccentric disc (5) can drive right anchor clamps body (3) and slide left anchor clamps body (2), thereby with work piece (6) centre gripping between two V type clamp splice (4), and realize auto-lock through the frictional force of eccentric disc (5) and right anchor clamps body (3).

2. The self-centering fixture of claim 1, wherein: the periphery of the base (1) is provided with a plurality of mounting holes (11), and the base (1) can be fixed on a working platform of the milling machine through the mounting holes (11).

3. The self-centering fixture of claim 1, wherein: the left clamp body (2) and the right clamp body (3) are respectively provided with a mounting groove (21) which is arranged along the vertical direction, two sides of the mounting groove (21) are provided with through holes, the V-shaped clamping blocks (4) are mounted in the mounting groove (21) and are provided with screw holes at positions corresponding to the through holes, and the two V-shaped clamping blocks (4) are respectively fixed on the left clamp body (2) and the right clamp body (3) through screws (22) penetrating through the through holes.

4. The self-centering fixture of claim 1, wherein: the novel clamping device is characterized in that two parallel guide plates (12) are arranged in the middle of the base (1), a dovetail-shaped guide groove is formed in the middle of each guide plate (12), the left clamp body (2) is fixed at the left end of the guide groove, and the right clamp body (3) is slidably arranged in the guide groove through a sliding part matched with the guide groove.

5. The self-centering fixture of claim 4, wherein: the right clamp body (3) is limited to slide in the limiting groove (13).

6. The self-centering fixture of any one of claims 1-5, wherein: the left clamp body (2) and the right clamp body (3) are connected together through a screw rod (7) and a nut (8), a spring (9) is connected to the screw rod (7) in a penetrating mode, and two ends of the spring (9) are respectively abutted to the left clamp body (2) and the right clamp body (3).

7. The self-centering fixture of claim 1, wherein: the base (1) is provided with a stud (14) at a position for installing the eccentric disc (5), and the eccentric disc (5) is rotatably arranged on the stud (14) and is limited to rotate on the stud (14) through a locking nut (51).

8. The self-centering fixture of claim 1, wherein: the side of the eccentric disc (5) is provided with a rotary handle (52).