CN203592165U - Three-jaw centering device - Google Patents

Abstract

The utility model discloses a three-jaw centering device and belongs to the technical field of tool clamps. The three-jaw centering device comprises a base plate. A supporting base is installed on the base plate. A clamping jaw fixing base is installed on the supporting base. A guiding shaft sleeve is arranged between the supporting base and the clamping jaw fixing base. A sliding core which is driven by a drive device is installed in the guiding shaft sleeve in a sliding mode. An annular groove is formed in the end of the sliding core. Three fixing portions are evenly distributed on the clamping jaw fixing base in the circumferential direction. A clamping jaw is installed on each fixing portion in a rotatable mode through a hinge pin. One end of each clamping jaw is provided with a clamping end used for clamping a workpiece, and the other end of each clamping jaw is provided with a ball-shaped end. Each ball-shaped end is limited in the corresponding groove. The three-jaw centering device is simple in structure and low in manufacturing cost; due to the fact that the lever principle is adopted, operation saves effort, and work efficiency is high; the three-jaw centering device is suitable for centering machining of heavy disk type workpieces, and is wide in application range; the clamping jaws can be adjusted flexibly according to the structures of parts, the stroke is large, and the function of supporting workpiece outside and the function of clamping the workpieces outside are achieved.

Description

Three-jaw centering device

technical field

The utility model belongs to the technical field of fixtures, in particular to a three-claw centering device.

Background technique

At present, many machined parts in the machining industry, such as housings, gearboxes, axle axle housings, etc., have large specifications (diameter greater than 300mm), and most of them have a disc structure. When processing on a vertical machine tool, the positioning needs to place the workpiece on its side, and use the center of the workpiece disc to find the datum before processing.

Most manufacturers use general-purpose manual and hydraulic three-jaw chucks for installation and positioning, which have the problems of large space occupation and relatively complicated manufacturing structure, and need to be equipped with positioning connectors and grippers, which are assembled on the machine tool for use, and the cost is relatively high; A general-purpose three-jaw centering device has an internal conical structure, and the hydraulic push-pull method is used to complete the three-jaw centering. Due to the large force inside the structure, the stroke is relatively small, easy to wear, and the frequency of replacement of wearing parts is high, and the cost is high.

Utility model content

The technical problem to be solved by the utility model is: to provide a three-claw centering device to solve the technical problems of the existing three-claw centering device which occupy a large space, high cost, small stroke and easy to wear.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is: a three-jaw centering device, including a bottom plate, a support seat is installed on the bottom plate, a claw fixing seat is installed on the support seat, and the support seat is connected with the clamp A guide bushing is provided between the claw fixing seats, and a sliding core driven by a driving device is slidably installed in the guiding bushing. The end of the sliding core is provided with an annular groove, and the claw fixing seat is along the circumference There are three fixed parts evenly distributed in the direction, and each fixed part is equipped with claws that are rotated through a pin shaft. One end of each of the claws is provided with a clamping end for clamping the workpiece, and the other end is provided with a clamping end. bulbous ends each constrained within the groove.

As an improvement, the driving device includes a compression positioning bolt, the compression positioning bolt is installed on the claw fixing seat, and the compression positioning bolt has a contact with both side walls of the groove. Force end.

As a further improvement, the force applying end is provided with an inner hexagonal blind hole extending axially, and the inner hexagonal blind hole deviates from the outer edge of the groove.

After adopting the above-mentioned technical scheme, the beneficial effect of the utility model is: because the three-jaw centering device is designed with a base plate, the base plate is equipped with a support seat, a claw fixing seat, a guide bushing and a sliding core driven by a driving device , the end of the sliding core is provided with an annular groove, and the claw fixing base is evenly distributed with three fixing parts along the circumferential direction, each of the fixing parts is rotatably mounted with a claw through a pin shaft, each One end of the jaws is provided with a clamping end for clamping the workpiece, and the other end is provided with a spherical end, and each of the spherical ends is constrained in the groove, so that it is driven by the driving device , the sliding core can move along the guide bushing, and then drive the spherical ends of the three claws to move, so that the clamping ends of the three claws rotate around the corresponding pin shafts, thereby completing the centering or disassembly of the workpiece. The utility model has the advantages of simple structure, low production cost, simple operation, labor-saving operation using the principle of lever force arm, and high work efficiency; it is suitable for centering processing of heavy-duty disc workpieces, and has a wide application range; and the jaws can be flexibly adjusted according to the structure of the parts , large stroke, with internal support and external clamping functions.

Since the driving device includes a compression positioning bolt, the compression positioning bolt is installed on the claw fixing seat, and the compression positioning bolt has a force application end that abuts against both side walls of the groove, so by The force-applying end drives the compression positioning bolt to move, so that the compression positioning bolt drives the movement of the sliding core to realize the axial movement of the sliding core. The structure is simple and the cost is low.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is A-A sectional view among Fig. 2;

Fig. 5 is B-B sectional view among Fig. 4;

Among the figure: 1. Base plate, 2. Support seat, 3. Claw fixing seat, 31. Fixed part, 4. Guide bushing, 5. Driving device, 51. Compression positioning bolt, 511. Force end, 512. Hexagon socket Blind hole, 6, sliding core, 61, groove, 7, bearing pin, 8, claw, 81, clamping end, 82, spherical end, 9, coarse positioning device, 91, positioning plate.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figures 1 to 5, the three-jaw centering device includes a base plate 1, a support base 2 is installed on the base plate 1, a jaw fixing base 3 is installed on the support base 2, and the support base 2 and the jaw fixing base 3 A guide sleeve 4 is arranged between them, and a sliding core 6 driven by the driving device 5 is slidably installed in the guide sleeve 4. The end of the sliding core 6 is provided with an annular groove 61, and the claw fixing seat 3 is evenly spaced along the circumferential direction. There are three fixed parts 31, and each fixed part 31 is equipped with claws 8 through the pin shaft 7. One end of each claw 8 is provided with a clamping end 81 for clamping the workpiece, and the other end is provided with a clamping end 81. The bulbous ends 82 are each constrained within the groove 61 .

Wherein, the driving device 5 includes a compression positioning bolt 51, the compression positioning bolt 51 is installed on the claw fixing seat 3, the compression positioning bolt 51 has a force application end 511 that is all against the two side walls of the groove 61, and the outer surface of the force application end 511 The circle can be set as an outer hexagon bolt head or a pin hole is set on the outer circle of the force application end 511, and then a handle or the like is installed on the pin hole. Preferably, the force application end 511 is provided with an axially extending inner hexagon blind hole 512, and the inner hexagon blind The hole 512 deviates from the outer edge of the groove 61, and an Allen wrench is used when applying force; of course, the driving device 5 can also be a hydraulic cylinder, and the cylinder body of the hydraulic cylinder is fixedly connected to the base plate 1, and the piston rod of the hydraulic cylinder is fixedly connected to the slide. The core 6 can be determined by those skilled in the art according to the actual situation, and will not be repeated here.

In order to improve the centering efficiency of the workpiece, a rough positioning device 9 for positioning the workpiece is installed on the side of the support base 2 on the base plate 1. The rough positioning device 9 includes a positioning plate 91 floatingly installed on the base plate 1. When the workpiece is clamped and fixed Before the heart, the workpiece is placed in the rough positioning device 9 with a spreader, and the position of the workpiece is initially determined.

When using the inner hole of the workpiece for centering, that is, when the three jaws 8 realize the inner support function, the workpiece is first placed in the rough positioning device 9, and then the inner circle of the workpiece is inserted into the clamping end 81 of the jaw 8, and the inner hexagon Insert the wrench into the inner hexagonal blind hole 512, rotate the inner hexagonal wrench, and screw the screw rod of the pressing positioning bolt 51 into the claw fixing seat 3. At this time, the force end of the pressing positioning bolt 51 presses the sliding core 6 and pushes the sliding core 6 toward the workpiece. At the same time, the sliding core 6 presses the spherical ends 82 of the three claws 8, so that the three claws 8 are subjected to the lever force at the same time, so that the clamping ends 81 of the claws 8 are supported outward around the pin shaft 7, and the locking and pressing Tighten the positioning bolt 51, and the centering is completed; when disassembling, use the hexagonal wrench to reversely rotate the compression positioning bolt 51, so that the screw rod of the compression positioning bolt 51 is screwed out of the claw fixing seat 3, and at this time, the positioning bolt 51 is pressed The force-applying end of the sliding core 6 presses the sliding core 6 and pushes the sliding core 6 to move in the opposite direction. At the same time, the sliding core 6 presses the spherical ends 82 of the three claws 8, so that the three claws 8 are subjected to the lever force at the same time, so that the clamping end of the claws 8 81 moves inwardly around the pin shaft 7 to complete the disassembly of the workpiece.

When the outer circle of the workpiece is used for centering, that is, when the three claws 8 realize the external clamping function, the process is basically the same as the above-mentioned process. The difference is that when the external clamping is performed, the hexagonal wrench drives the movement direction of the compression positioning bolt 51. On the contrary, no further details are given here.

The utility model has the advantages of simple structure, low production cost, simple operation, labor-saving operation using the principle of lever force arm, and high work efficiency; it is suitable for centering processing of heavy-duty disc workpieces, and has a wide application range; and the jaws can be flexibly adjusted according to the structure of the parts , large stroke, with internal support and external clamping functions.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. Three-claw centering device, comprise base plate, it is characterized in that, on described base plate, supporting seat is installed, claw holder is installed on described supporting seat, between described supporting seat and claw holder, be provided with guideway, in described guideway, be slidably fitted with the slide core being driven by drive unit, the end of described slide core is provided with annular groove, described claw holder is along the circumferential direction evenly equipped with three fixed parts, on each described fixed part, be all rotatablely equipped with claw by bearing pin, one end of each described claw is equipped with the bare terminal end for holding workpiece, the other end is equipped with balled end, each described balled end all constrains in described groove.

2. Three-claw centering device according to claim 1, it is characterized in that, described drive unit comprises compression bolt, and described compression bolt is arranged on described claw holder, and described compression bolt has the force side all offseting with the two side of described groove.

3. Three-claw centering device according to claim 2, is characterized in that, described force side is provided with axially extended interior hexagonal blind hole, and described interior hexagonal blind hole deflects away from the outer rim of described groove.

Images