CN206795289U - A kind of clamping device capable of rapid positioning - Google Patents

Abstract

The utility model discloses a kind of clamping device capable of rapid positioning, including the base of rotatable fixture and stationary fixture, the fixture is arranged on base by steel ball power transmission positioning component, and is provided between fixture and base to determining mechanism.The fixture of the utility model device is arranged on base by steel ball power transmission positioning component, can quickly realize locking and the release the lock of fixture, is easy to switch the machined surface of workpiece, and simple in construction, reduces manufacturing cost.

Description

A fast-positioning clamping device

technical field

The utility model relates to the technical field of mechanical manufacturing equipment and tooling, in particular to a fast-positioning clamping device.

Background technique

Due to the difference in structural design and processing objects of machine tools, the number of motion axes is quite different, resulting in a huge difference in cost. Among them, the three-axis CNC machine tool has the advantages of low cost, mature design, and large processing range, and has become the machine tool with the largest inventory and the most widely used.

For most of the workpieces to be processed, at least two of the six surfaces of the upper and lower, left and right, and front and rear surfaces need to be processed. If a three-axis CNC machine tool is used to process such workpieces, the workpiece needs to be turned over at least once, and the Finally, re-clamp and calibrate the workpiece, which is not conducive to the improvement of processing efficiency, and it is difficult to ensure the processing accuracy.

Aiming at the above problems, fixture-assisted machine tools are usually used for processing. The commonly used fixture is an indexing chuck, which can rotate 360°unlimitedly on a certain axis. However, most of the time, the workpiece only needs to be rotated 90°, 180° , 45° and other predetermined rotation angles for switching and positioning, resulting in high processing costs; in addition, it also has the problems of difficulty in fast locking, fast switching of reference planes, and large volume, which makes installation and line replacement a lot of work.

The patent document whose publication number is CN101134285A discloses a fast indexing and positioning locking indexing head, that is, a fixture for machine tools. The indexing head has a base, a rotating shaft supported on the base for rotation, an indexing plate, a fixture fixed on the rotating shaft for clamping workpieces, and a locking mechanism for locking the indexing plate. It realizes the positioning of the fixture through the cooperation of the index plate and the ratchet mechanism, that is, the two together constitute the fixing mechanism of the fixture, and realizes the axial direction of the fixture through the cooperation of the locking sleeve, the cone sleeve and the locking handle. of the lock. Although the indexing head simplifies the structure and reduces the cost, because it uses the ratchet mechanism and the indexing plate as the matching mechanism, the fixture can only rotate in one direction and cannot rotate in both directions, which is inconvenient for the selection of the processing process, and it is After indirect positioning of the rotating shaft, the fixture is positioned through the rotating shaft. The rotating shaft is susceptible to changes due to torque and impact during processing, which will affect the accuracy of subsequent processing and even cause damage to the rotating shaft. The strength, size and structural design of the shaft put forward high requirements.

Utility model content

The utility model provides a fast-positioning fast-positioning clamping device, which solves the problems of difficult fast locking, cumbersome operation and complex positioning mechanism of traditional clamps.

A clamping device that can be quickly positioned includes a rotatable clamp and a base that fixes the clamp. The clamp is installed on the base through a steel ball force transmission positioning assembly, and a matching mechanism is provided between the clamp and the base.

Preferably, the alignment mechanism includes a positioning block on the base and an isolated positioning key, the two surfaces of the positioning block opposite to the clamp have positioning grooves that cooperate with the positioning key, and one of the surfaces has a There are less than two positioning grooves distributed along the rotation direction of the clamp. The alignment mechanism in the form of a keyway is simple in structure, easy to process, and easy to operate. The positioning mechanism matched with the keyway can realize fast clamping and calibration after the workpiece processing surface is switched, and can also share the force generated during the use of the clamping device.

Preferably, one of the surfaces has four positioning grooves evenly distributed along the rotation direction of the clamp, and the processing surface of the workpiece can be switched every time the clamp rotates 90 degrees.

Preferably, there are at least two positioning blocks on the base, and the planes where the adjacent positioning blocks are located are perpendicular to each other. By installing the clamps on different positioning blocks, more surfaces of the workpiece can be processed.

Preferably, the positioning block and the base have a split structure, and the split positioning block can be processed separately, with higher processing accuracy and convenient assembly and maintenance. In addition, by replacing the positioning block, fixtures with different requirements can be matched on the same base, effectively increasing the frequency of use of the base and saving costs.

Preferably, the steel ball force transmission positioning assembly includes a positioning sleeve, a positioning bush and a tapered bush, wherein the positioning bush is fixed on the positioning block, and the tapered bush is fixed on the fixture.

Further preferably, the base is a hollow structure with an operation hole on the side away from the clamp. With this structure, one of the sides is provided with an operation hole, and fixtures can be installed on the other sides.

The fixture of the device of the utility model is installed on the base through the steel ball force transmission positioning component, which can quickly realize the locking and releasing of the fixture, facilitate switching the processing surface of the workpiece, and has a simple structure and reduces the manufacturing cost.

Description of drawings

Fig. 1 is a schematic structural diagram of the separation state of the base and the fixture of the clamping device of the present invention;

Fig. 2 is a schematic diagram of the top view structure of the clamping device of the present invention;

Figure 3 is a sectional view of the clamping device of the present invention;

Fig. 4 is a sectional view of the steel ball force transmission positioning assembly of the present invention;

Fig. 5 is a schematic structural view of the clamp of the clamping device of the present invention.

detailed description

As shown in Figure 1, a clamping device that can be quickly positioned includes a base 1 and a fixture 2. There are various fixing mechanisms for clamping workpieces on the fixture 2. It can adopt existing designs, such as mesh plates, Figure 5 Shown T-slot plate, special tooling plate or center vise, etc.

As shown in Figures 3 and 4, the fixture 2 is installed on the base 1 through the steel ball force transmission and positioning assembly. The steel ball force transmission and positioning assembly includes a positioning sleeve 31, a tapered bushing 32 and a positioning bushing 33, and the positioning sleeve 31 There are several small holes at the position matched with the tapered bushing 32, and small steel balls 36 are arranged in the small holes, and there are large steel balls 35 for squeezing the small steel balls 36 into the tapered bushing 32 and pushing the big steel balls 35 in the cavity of the positioning sleeve. movement of the socket head cap screw 34 .

As shown in Figure 1-3, there is an alignment mechanism between the fixture and the base, the alignment mechanism includes a positioning block 4 on the base 1, and the positioning block 4 is provided with four positioning grooves 41 evenly distributed along the direction of rotation of the fixture , The surface of the fixture opposite to the positioning block has a positioning groove 21. When the clamp is installed in place, the positioning groove 41 cooperates with the positioning groove 21 to form a blind hole that cooperates with the positioning key 5 to limit the relative rotation between the clamp 2 and the base 1 . The positioning block 4 and the base 1 adopt a split structure and are fixed by a pin hole structure, which is convenient for processing and assembly. The positioning block 4 has four positioning slots with an included rotation angle of 90°. When the fixture 2 is installed on the positioning block 4, the workpiece can rotate at four angles of 90°, 180°, 270°, and 360°, thereby realizing four Switching of the processing surface.

As shown in Figure 3, the tapered bushing 32 of this embodiment is fixed on the fixture 2, the positioning bushing 33 is fixed on the positioning block 4, and the positioning sleeve 31 passes through the positioning bushing 33 and the tapered bushing 32, thereby connecting Base 1 and Fixture 2. The base 1 is a hollow structure, and one of its sides has an operation hole 15 through which a wrench can turn a hexagon socket head cap screw 34 to realize locking and unlocking of the clamp 2 .

As shown in Figures 1 and 2, except the side with positioning block 4, positioning block 40 and the side with operation hole 15, the remaining three surfaces of the base 1 are provided with positioning grooves 13, and the bottom surface is provided with pin holes 14, It is convenient for quick positioning of devices and machine tools. The positioning block 40 is positioned on the top surface of the base, and the positioning block 40 is vertically arranged with the positioning block 4 on the side.

The working principle of the utility model is as follows:

The clamp 2 of the utility model is installed on the base 1 through the steel ball force transmission positioning component, and the hexagon socket screw 34 is tightened by a wrench, and the big steel ball 35 is pushed, and the big steel ball 35 will squeeze the small steel ball 36 into the cone bushing , prompting the clamp 2 to move toward the positioning block 4 until it abuts against the positioning block 4 to limit its axial movement. At the same time, the positioning groove 41 on the positioning block 4 and the positioning groove 21 on the clamp 2 are matched in place, and the positioning key 5 is inserted to limit the circumferential rotation of the clamp 2 relative to the base, and finally the clamp 2 is fixed on the base 1 .

When it is necessary to switch the working surface of the workpiece, turn the hexagon socket head screw 34 in the opposite direction, the small steel ball 36 will no longer have a pressing effect on the tapered bushing 32, the clamp 2 can move in the axial direction, pull out the positioning key 5, and the clamp 2 axis Turn towards recovery. After turning the fixture at a corresponding angle, tighten the hexagon socket head cap screw 34 again, so that the fixture 2 is fixed on the base 1 again, and the switching is very convenient and fast.

When it is necessary to process the working surface of the workpiece facing away from the positioning block 4, reversely turn the hexagon socket head cap screw 34, remove the clamp 2 and replace it on the positioning block 40, and lock the clamp 2 and the positioning block 40 through the steel ball force transmission positioning assembly. Tight enough.

Claims (7)

1. a kind of clamping device capable of rapid positioning, including the base of rotatable fixture and stationary fixture, it is characterised in that institute State fixture to be arranged on base by steel ball power transmission positioning component, and be provided between fixture and base to determining mechanism.

2. clamping device capable of rapid positioning as claimed in claim 1, it is characterised in that determining mechanism for described pair includes being located at bottom Locating piece and in vitro positioning key on seat, the locating piece two surfaces relative with fixture have determines with what positioning key coordinated Position groove, and one of them described surface has the locating slot being distributed no less than two along fixture rotation direction.

3. clamping device capable of rapid positioning as claimed in claim 2, it is characterised in that one of them described surface has four It is individual along the equally distributed locating slot of fixture rotation direction.

4. clamping device capable of rapid positioning as claimed in claim 2 or claim 3, it is characterised in that have at least on the base Two locating pieces, and the plane where the bearing of trend of adjacent positioned block is mutually perpendicular to.

5. clamping device capable of rapid positioning as claimed in claim 2, it is characterised in that the locating piece and base are split Formula structure.

6. clamping device capable of rapid positioning as claimed in claim 2, it is characterised in that the steel ball power transmission positioning component bag Abutment sleeve, positioning bushing and conical surface bushing are included, wherein positioning bushing is fixed on locating piece, conical surface bushing is fixed on fixture On.

7. clamping device capable of rapid positioning as claimed in claim 6, it is characterised in that the base is hollow structure, and And wherein side has handle hole.