CN207289498U - Gearbox part self-centering fixture - Google Patents

Abstract

The utility model relates to the technical field of fixtures for product processing centers, in particular to a self-centering fixture for gearbox parts, which can conveniently realize symmetrical positioning and fixing, and includes a bottom plate on which a positioning and clamping mechanism is installed. The positioning and clamping mechanism includes Longitudinal positioning structure and horizontal positioning structure. The longitudinal positioning structure includes positioning pins arranged in a triangle and playing a supporting role, the horizontal pressing surface of the pressure plate, and the locking block. The tight support seat is connected by bolts; the lateral positioning structure includes a wedge positioning mechanism, a side clamping mechanism and a side pressing mechanism. The wedge positioning mechanism and the side clamping mechanism are arranged on one side of the positioning pin, and the side pressing mechanism is arranged on the positioning pin. On the other side, the wedge positioning mechanism includes a longitudinal push block and transverse positioning blocks arranged on both sides of the longitudinal push block, and the longitudinal push block cooperates with the transverse positioning block through an inclined surface.

Description

Gearbox parts self-centering fixture

technical field

The utility model relates to the technical field of fixtures for product processing centers, in particular to a self-centering fixture for gearbox parts.

Background technique

The automobile gearbox is an important part of the automobile. It is composed of many parts. When the surface, hole, shaft and other elements processed by the machining center of these parts have symmetry requirements, strict requirements are placed on the positioning and clamping of the tooling. The traditional six-point positioning method usually cannot effectively and stably control the required symmetry when the blank surface is used for positioning. If the positioning points that affect the symmetry are made adjustable, although the requirements for the symmetry of the parts can be met, it is not suitable for mass production and automated production transformation. For some special parts, such as thin-walled parts and complex irregular structural parts, when they have symmetry requirements, they need to be clamped and positioned symmetrically when they are processed and produced. Due to the limitations of processing equipment and the environment, the traditional There is a certain difficulty in positioning the positioning tool, and its symmetry cannot be guaranteed.

Utility model content

In order to solve the above problems, the utility model provides a self-centering fixture for gearbox parts, which can conveniently realize symmetrical positioning and fixing.

Its technical solution is as follows: a self-centering fixture for gearbox parts, which includes a bottom plate, and a positioning and clamping mechanism is installed on the bottom plate, characterized in that the positioning and clamping mechanism includes a longitudinal positioning structure and a transverse positioning structure , the longitudinal positioning structure includes positioning pins arranged in a triangle and playing a supporting role, the horizontal pressing surface of the pressing plate, and a locking block, the pressing plate is installed on the pressing plate bracket, and the locking block is press-fitted on the pressing plate And connected with the locking support seat with bolts; the lateral positioning structure includes a wedge positioning mechanism, a side clamping mechanism and a side pressing mechanism, and the wedge positioning mechanism and the side clamping mechanism are arranged on the positioning pin On one side, the side pressing mechanism is arranged on the other side of the positioning pin, and the wedge positioning mechanism includes a longitudinal push block and transverse positioning blocks arranged on both sides of the longitudinal push block. The horizontal positioning block is matched by an inclined surface, and the side clamping mechanism includes side clamping blocks arranged on both sides of the wedge positioning mechanism, and the side clamping block and the longitudinal push block are connected to push screws. The side pressing mechanism includes the longitudinal pressing surface of the pressing plate and the pressing plate support.

It is further characterized in that a centering bracket is installed on the base plate, and a T-shaped perforation is opened on the centering bracket, and the longitudinal push block and the transverse positioning block are correspondingly arranged in the T-shaped perforation. The lateral positioning block is connected to the centering bracket through a first return spring;

The two transverse openings of the T-shaped perforation are respectively equipped with spring washers, one end of the first return spring is connected to the transverse positioning block, and the other end is connected to the spring washers;

The end of the longitudinal push block is wedge-shaped and the wedge angle is 15-30°;

The push screw includes a first push screw and a second push screw, the longitudinal push block is provided with a T-shaped slot, and the end of the first push screw is equipped with a connector matching the T-shaped slot. the end of the second push screw abuts the side clamping block;

A fixing plate is installed on the centering bracket, the first pushing screw and the second pushing screw are installed through the fixing plate, and the fixing plate and the side clamping block are connected by a second reset spring connection;

The side pressing mechanism also includes a locking support seat and a pressing plate positioning seat, and a locking block is installed on the locking supporting seat through bolts, and when the pressing plate bracket is flipped over until the end is snapped into the pressing plate positioning seat , the locking block compresses the upper end of the pressure plate bracket to achieve fixation.

After adopting the structure of the utility model, the parts are supported by three positioning pins, the horizontal pressing surface of the pressure plate presses the parts from the upper end surface and is locked by the locking block, and the pushing screw drives the vertical pushing block to move to realize the simultaneous movement of two horizontal positioning blocks. The parts are clamped to achieve self-centering positioning, and the side clamping block cooperates with the longitudinal pressing surface of the pressure plate to clamp the parts from the side, which conveniently realizes symmetrical positioning and fixing, and makes up for the limitations of traditional positioning fixtures.

Description of drawings

Fig. 1 is a front view of the structure of the utility model;

Fig. 2 is a cross-sectional view in Fig. 1;

Fig. 3 is a schematic diagram of the structure of the clamping parts of the utility model.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, a self-centering fixture for gearbox parts includes a base plate 1 on which a positioning clamping mechanism is installed, and the positioning clamping mechanism includes a longitudinal positioning structure and a lateral positioning structure. The longitudinal positioning structure includes positioning pins 2 arranged in a triangle and supporting them, the horizontal pressing surface of the pressure plate 17, and a locking block 19. The seat 14 is connected with bolts 18, and the lateral positioning structure includes a wedge positioning mechanism, a side clamping mechanism and a side pressing mechanism. The end of the push block 3 is wedge-shaped and the wedge angle is 15-30°. The vertical push block 3 and the horizontal positioning block 4 cooperate through the inclined surface. The vertical push block 3 pushes the two horizontal positioning blocks 4 to move outward at the same time, and then achieves the centering effect. , and the wedge angle does not reach 45°, before the longitudinal push block 3 is withdrawn, the transverse positioning block 4 cannot be folded inward and is in a locked state. The side clamping mechanism includes side clamping arranged on both sides of the wedge positioning mechanism. Block 5, side clamping block 5 and longitudinal push block 3 are all connected to push screws, and the side pressing mechanism includes the longitudinal pressing surface of pressing plate 17 and pressing plate support 13.

A centering bracket 6 is installed on the bottom plate 1, and a T-shaped perforation is opened on the centering bracket 6. The longitudinal push block 3 and the transverse positioning block 4 are correspondingly arranged in the T-shaped perforation, and the two transverse openings of the T-shaped perforation are respectively installed with Spring washer 7, one end of the first return spring 8 is connected to the transverse positioning block 4, and the other end is connected to the spring washer 7, the push screw includes the first push screw 9 and the second push screw 10, and the longitudinal push block 3 has a T-shaped groove The end of the first push screw 9 is equipped with a connector 20 matching the T-shaped slot, and the end of the second push screw 10 abuts against the side clamping block 5. When the first push screw 9 is screwed outward, after pulling the longitudinal push block 3 When withdrawing, the lateral positioning block 4 will automatically reset under the action of the first back-moving spring 8, and a fixing plate 11 is installed on the centering bracket 6, and the first pushing screw 9 and the second pushing screw 10 are all penetrated and installed on the fixing plate 11. The plate 11 and the side clamping block 5 are connected by the second return spring 12 , and when the second pushing screw 10 retreats, the side clamping block 5 will automatically reset under the action of the second return spring 12 .

The side pressing mechanism comprises a pressing plate support 13, a locking support seat 14 and a pressing plate positioning seat 15, a pressing plate 17 is installed on the pressing plate supporting seat 13 by a pin shaft 16, a locking block 19 is installed on the locking supporting seat 14 by a bolt 18, and the pressing plate When the bracket 13 is flipped over until the end is stuck on the pressure plate positioning seat 15, the locking block 19 is installed and the upper end of the pressure plate bracket 13 is pressed by the bolt 18 to fix it. When the parts need to be loosened, the locking block 19 is removed first. Turn over the platen bracket 13.

Claims (7)

1. A self-centering fixture for gearbox parts, comprising a base plate, on which a positioning and clamping mechanism is installed, characterized in that, the positioning and clamping mechanism comprises a longitudinal positioning structure and a lateral positioning structure, and the longitudinal positioning The structure includes positioning pins arranged in a triangle and supporting them, the horizontal pressing surface of the pressure plate, and a locking block. The seat is connected by bolts; the lateral positioning structure includes a wedge positioning mechanism, a side clamping mechanism and a side pressing mechanism, the wedge positioning mechanism and the side clamping mechanism are arranged on one side of the positioning pin, and the The side pressing mechanism is arranged on the other side of the positioning pin, and the wedge positioning mechanism includes a longitudinal push block and transverse positioning blocks arranged on both sides of the longitudinal push block, and the longitudinal push block and the transverse positioning block pass through Slope fit, the side clamping mechanism includes side clamping blocks arranged on both sides of the wedge positioning mechanism, the side clamping blocks and the longitudinal push block are both connected to push screws, and the side clamping mechanism includes The longitudinal pressing surface of the pressing plate and the pressing plate support. 2. A self-centering fixture for gearbox parts according to claim 1, wherein a centering bracket is installed on the base plate, a T-shaped perforation is opened on the centering bracket, and the longitudinal pushing A block is arranged in the T-shaped through hole corresponding to the lateral positioning block, and the lateral positioning block is connected to the centering bracket through a first return spring. 3. A self-centering fixture for gearbox parts according to claim 2, characterized in that spring washers are respectively installed at the two transverse openings of the T-shaped perforation, and one end of the first return spring is connected to the The other end of the lateral positioning block is connected to the spring washer. 4 . The self-centering fixture for gearbox parts according to claim 1 , wherein the end of the longitudinal push block is wedge-shaped with a wedge angle of 15-30°. 5. The self-centering fixture for gearbox parts according to claim 1, wherein the push screw comprises a first push screw and a second push screw, and a T-shaped slot is opened on the longitudinal push block, The end of the first push screw is installed with a connector matching the T-shaped slot, and the end of the second push screw abuts against the side clamping block. 6. A self-centering fixture for gearbox parts according to claim 5, wherein a fixing plate is installed on the centering bracket, and both the first push screw and the second push screw are installed through On the fixed plate, the fixed plate is connected to the side clamping block through a second return spring. 7. A self-centering fixture for gearbox parts according to claim 1, characterized in that, the side pressing mechanism also includes a locking support seat and a pressure plate positioning seat, and the locking support seat is installed by bolts There is a locking block, and when the end of the pressing plate bracket is flipped over to be embedded in the positioning seat of the pressing plate, the locking block presses the upper end of the pressing plate bracket to fix it.