CN103817543A - Fixtures for clamping circular workpieces - Google Patents

Abstract

The invention discloses a clamp for clamping a circular workpiece, which comprises a first positioning mechanism for radially expanding the circular workpiece, a second positioning mechanism for axially pressing the circular workpiece, and a synchronizing mechanism connected with the first positioning mechanism and the second positioning mechanism, wherein the synchronizing mechanism is used for synchronously operating the first positioning mechanism and the second positioning mechanism so as to position or release the circular workpiece, and the clamp also comprises a hydraulic driving device which is connected with the synchronizing mechanism so as to drive the synchronizing mechanism to synchronously operate. The hydraulic driving device drives the synchronous mechanism to perform synchronous operation so as to synchronously complete the radial positioning of the first positioning mechanism and the axial positioning of the second positioning mechanism, thereby improving the positioning precision, remarkably reducing the labor intensity of operators, improving the working efficiency and increasing the stability of the clamp for clamping the circular workpieces.

Description

Fixtures for clamping circular workpieces

technical field

The invention relates to the field of mechanical processing, in particular to a clamp for clamping a circular workpiece.

Background technique

When processing (such as turning or grinding) a circular workpiece (especially a large-diameter thin circular workpiece), a three-jaw chuck is usually used to clamp the workpiece to be processed. Because the thickness of the large-diameter thin circular workpiece is not large, it is inconvenient to clamp, and it is easy to produce skew during clamping, and the large diameter will amplify the degree of skew, resulting in inaccurate positioning, and machining allowance on the end surface of the workpiece is very likely to occur during turning. The problem of unevenness will cause the phenomenon of knife punching, resulting in the scrapping of parts. Therefore, the three-jaw chuck is very unsuitable for processing large-diameter circular workpieces.

Contents of the invention

The object of the present invention is to provide a fixture for clamping a circular workpiece, which can reduce the labor intensity of operators and improve work efficiency.

In order to achieve the above object, the present invention provides a fixture for clamping a circular workpiece, the fixture includes a first positioning mechanism for radially expanding the circular workpiece, and a first positioning mechanism for axially compressing the circular workpiece. The second positioning mechanism of the circular workpiece and the synchronization mechanism connected to the first positioning mechanism and the second positioning mechanism, the synchronization mechanism is used to synchronously operate the first positioning mechanism and the second positioning mechanism, so as to The circular workpiece is positioned or released, and the clamp further includes a hydraulic driving device connected with the synchronous mechanism to drive the synchronous mechanism to perform synchronous operation.

Using the fixture of the present invention, the radial and axial positioning of the circular workpiece can be provided by the first positioning mechanism and the second positioning mechanism respectively, so as to stably clamp the circular workpiece for processing such as turning and grinding. The synchronous operation of the mechanism can complete the radial and axial positioning simultaneously, thereby improving the positioning accuracy, and by using the hydraulic drive device to drive the synchronous mechanism for synchronous operation, the labor intensity of the operator can be significantly reduced, the work efficiency can be improved, and the number of fixtures can be increased. The stability of clamping circular workpieces.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the front view of a kind of embodiment of the fixture for clamping circular workpiece of the present invention, wherein omitted hydraulic drive device;

Fig. 2 is a sectional view taken along the broken line A-A in Fig. 1, and a hydraulic drive device is added.

Explanation of reference signs

1 Clamp body 2 Slider 3 Stopper

4 The first return spring 5 Pressing piece 6 Pull rod

7 taper sleeve 8 lever 9 swivel bolt

10 The first housing 11 The second housing 12 The second return spring

13 positioning ring 14 circular workpiece 15 top shaft

16 pistons 17 cylinder blocks 18 top

19 Unplugging 5a Mounting part 5b Pressing plate part

15a insertion hole 18a oil filling port

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, unless otherwise specified, the used orientation words such as "up, down, left, and right" usually refer to the upper, lower, left, and right in the drawings, and "inside and outside" refer to the relative Inside and outside the outline of each part itself.

Referring to Fig. 1 and Fig. 2, the present invention relates to a fixture for clamping a circular workpiece (hereinafter referred to as the fixture), which includes a first positioning mechanism for radially expanding the circular workpiece 14, for Axially compress the second positioning mechanism of the annular workpiece 14 and the synchronizing mechanism connected to the first positioning mechanism and the second positioning mechanism, and the synchronizing mechanism is used to synchronously operate the first positioning mechanism and the second positioning mechanism to align the circle The annular workpiece 14 is positioned or released, and the fixture also includes a hydraulic drive device connected with the synchronization mechanism to drive the synchronization mechanism to perform synchronization operations.

Using the fixture of the present invention, the circular workpiece 14 can be provided with radial and axial positioning through the first positioning mechanism and the second positioning mechanism respectively, so as to stably clamp the circular workpiece for processing such as turning and grinding. The synchronous operation of the synchronous mechanism can complete the radial and axial positioning simultaneously, thereby improving the positioning accuracy, and by using the hydraulic drive device to drive the synchronous mechanism for synchronous operation, the labor intensity of the operator can be significantly reduced, and the work efficiency can be increased. The stability of the fixture to hold the circular workpiece.

Wherein, the first positioning mechanism provides radial positioning by applying a radial force to the circular workpiece 14 . Preferably, the first positioning mechanism is used for radially expanding the annular workpiece 14 , that is, exerting a radially outward force on the annular workpiece 14 .

The positioning structure used for the above-mentioned radial positioning can adopt various appropriate forms, as long as it can provide a radially outward force to the annular workpiece 14. In the embodiment shown in Figures 1 and 2, the first The positioning mechanism includes a clamp body 1 for sheathing a circular workpiece 14. The clamp body 1 is provided with a plurality of chutes along the circumference, and a slidable slider 2 is accommodated in each chute. Under this structure, when the hydraulic pressure When the driving device drives the synchronous mechanism to operate synchronously, the slider 2 can move radially along the circular workpiece 14 under the synchronous operation of the synchronous mechanism to radially expand the circular workpiece 14, so that the circular workpiece can be moved in the radial direction. upward positioning.

As for the structure of the second positioning mechanism, various appropriate forms can also be adopted, as long as it can provide axial clamping force to the annular workpiece 14 . In the embodiment shown in Figures 1 and 2, the second positioning mechanism may include a first housing 10 and a pressing member 5, and the first housing 10 is connected to the first side of the clip body 1 for resisting Lean on an end face of the circular workpiece 14 . It can be understood that, here, the diameter of the first housing 10 should be larger than the diameter of the chuck body 1 , so as to realize the abutment against the end surface of the circular workpiece 14 . The pressing member 5 is movably arranged on the second side of the clamp body 1 opposite to the first side, and the hydraulic drive device will be able to drive the synchronous mechanism to operate synchronously, so that the pressing member 5 can operate synchronously in the synchronous mechanism. Move downward towards the clamping body 1, to cooperate with the first housing 10 to axially clamp the annular workpiece 14, and realize the positioning of the annular workpiece 14 in the axial direction. At this time, the first housing 11 and the pressing The fasteners 5 respectively act on the two end surfaces of the circular workpiece 14 . In addition, in a preferred embodiment, the pressing member 5 is rotatable to switch between a non-clamping position and a clamping position. When the pressing part 5 is switched to the clamping position, the hydraulic drive device can drive the synchronous mechanism to operate synchronously, so that the pressing part 5 moves toward the clamping body 1 under the synchronous operation of the synchronous mechanism, so as to cooperate with the first housing 10 The annular workpiece 14 is axially clamped to realize the positioning of the annular workpiece 14 in the axial direction.

It can be seen that in the above-mentioned second positioning mechanism, the pressing member 5 is installed in a rotatable form. When it is rotated to the non-clamping position, the pressing member 5 will not contact the circular workpiece 14, which is beneficial to the circular workpiece 14. The ring-shaped workpiece 14 is easily sleeved on the clamp body 1. When rotating to the clamping position, the pressing member 5 can contact the ring-shaped workpiece 14, and press the ring-shaped workpiece 14 through the synchronous operation of the synchronous mechanism. Apply an axial force. It can be understood that when the pressing member 5 does not interfere with the clamping of the circular workpiece, the pressing member 5 can include various appropriate structural forms, for example, in conjunction with the specific embodiment shown in Figure 1 and Figure 2, the pressing member 5 It includes a mounting portion 5a and a pressing plate portion 5b fixed to each other, the mounting portion 5a protrudes into the clip body 1 and is connected with the synchronization mechanism (more specific connection structure will be described in detail below), the pressing plate portion 5b A flange is provided for compressing the circular workpiece 14 . Nevertheless, the pressing member 5 is not limited to this structure. Preferably, the edge of the end face of the clamping body 1 is provided with a rotation slot that allows the pressing plate portion 5b of the pressing member 5, so that the pressing plate portion 5b can be rotated to the non-clamping position without contact with the ring Shape workpiece 14 contacts, and is used for contacting with annular workpiece 14 when rotating to clamping position.

For the above-mentioned first positioning mechanism and the second positioning mechanism, as long as the slide block 2 of the first positioning mechanism and the pressing member 5 of the second positioning mechanism can be moved simultaneously, the circular workpiece 14 can be simultaneously radially and axially aligned. Orientation. Various suitable synchronization mechanisms may be employed for this purpose. As shown in FIGS. 1 and 2 , the synchronization mechanism may include a pull rod 6 , a taper sleeve 7 , a lever 8 and a swing bolt 9 .

Wherein, the first end of the pull rod 6 passes through the clamp body 1 and is connected to the hydraulic drive device, so that the hydraulic drive device drives the pull rod 6 to move. In addition, the second end of the tie rod 6 opposite to the first end is relatively movable connected to the first housing 10, the taper sleeve 7 is fixedly sleeved on the pull rod 6, and the slider 2 is slidably matched with the outer surface of the taper sleeve 7 . Under this structure, one end of the lever 8 is hinged to the second end of the pull rod 6, the other end of the lever 8 is hinged to one end of the swing bolt 9, and the middle part of the lever 8 is hinged to the first housing 10, and the swing bolt The other end of 9 passes through the first housing 10 and clamp body 1 in turn, and then connects with the pressing member 5 .

In the synchronous mechanism of the above specific embodiment, the lever 8 can rotate around its hinge point with the first housing 10, thereby producing a leverage effect, that is, when the pull rod 6 hinged with one end moves in one direction, it is hinged with the other end. The swing bolt 9 will be driven by the lever 8 to move opposite to the direction of movement of the pull rod 6 . Wherein, the hinged position and hinged structure of the lever 8 and the first housing 10 can be determined according to actual needs. For example, the lever 8 can be directly hinged on the side wall of the first housing 10, referring to Fig. 2 , in this specific embodiment, a hinge seat (not marked) is fixed on the first housing 10, and the lever 8 is hinged on the side wall of the first housing 10. The hinged structure in the middle is realized on the hinged seat. Under the synchronous mechanism, the mounting part 5a of the pressing member 5 extends into the clamp body 1 and is sleeved on the hinge bolt 9 .

According to the above-mentioned synchronous mechanism, the hydraulic drive device can drive the pull rod 6 to move, to drive the taper sleeve 7 to move linearly along the axial direction of the circular workpiece 14 and to drive the joint bolt 9 to move through the leverage of the lever 8, so that through the cone The sliding cooperation between the sleeve 7 and the slider 2 pushes the slider 2 to move radially along the annular workpiece 14, and drives the pressing part 5 to move axially toward the clamp body 1 through the swing bolt 9. In this way, on the slider 2 and the pressing member 5 complete the radial positioning and axial positioning of the circular workpiece 14.

For the above synchronous mechanism, the present invention uses a hydraulic method to drive the pull rod 6 to move, which can not only reduce the work intensity of the operator, improve work efficiency, but also ensure that the circular workpiece 14 is completely clamped in the axial direction. Referring to FIG. 2 , the hydraulic drive device may include a top shaft 15 , a piston 16 and a cylinder 17 , but is not limited to these components.

Wherein, the top shaft 15 is fixedly connected with the clamp body 1, the piston 16 is fixedly sleeved on the top shaft 15 and abuts against the clamp body 1, and at the same time, the cylinder body 17 is sleeved on the top shaft 15 and passes through the The pulling pin 19 of the top shaft 15 is connected with the pull rod 6, so that the cylinder body 17 is connected with the piston 16 to form an oil chamber. More precisely, the oil chamber is surrounded by the top shaft 15, the piston 16 and the cylinder body 17. . When the pressure oil is injected into the oil chamber, the cylinder body 17 moves on the top shaft 15 relative to the piston 16 under the action of the pressure oil and can drive the pull rod 6 to move by pulling out the pin 19 .

For the convenience of injecting pressure oil, the hydraulic drive device can also include a top 18, which includes an oil filling port 18a, and the top 18 includes a filling port and a first oil circuit, and the first oil circuit is connected to the oil filling port 18a; and the end of the top shaft 15 The part is provided with an insertion hole 15a and a second oil passage, and the second oil passage is connected to the oil chamber; when the tip 18 is inserted into the insertion hole 15a, the first oil passage and the second oil passage are connected so that the oil can be injected from the oil injection port 18a The pressure oil is injected into the oil chamber through the first oil passage and the second oil passage. Wherein, inserting the tip 18 into the end of the top shaft 15 is beneficial to stabilizing the tip 18 . Under the condition of not hindering the movement of the cylinder body 17, in a modification implementation, an insertion hole can also be set on the top 18, and the end of the top shaft 15 can be inserted into the insertion hole of the top 18, so that the top 18 and the top shaft 15 The first oil passage and the second oil passage can be connected firmly, so that the pressure oil injected from the oil injection port 18a is injected into the oil chamber through the first oil passage and the second oil passage.

Preferably, in the above fixture structure, the pressing member 5 can adopt various appropriate forms, as long as it can provide axial force to the annular workpiece 14 without affecting the loading and unloading of the annular workpiece 14 . At the same time, for different types of pressing parts 5 , a suitable synchronous mechanism can be adopted to push the pressing parts 5 .

Referring to FIG. 1 , the fixture of the present invention preferably includes a plurality of levers 8 , a plurality of swing bolts 9 and a plurality of pressing pieces 5 arranged along the circumferential direction of a circular workpiece 14 . The specific connection structure is that one end of each lever 8 is hinged to the second end of the pull rod 6, the middle of each lever 8 is hinged to the first housing 10, and the other end of each lever 8 is hinged to the corresponding swing bolt 9, and the other end of the corresponding swing bolt 9 passes through the first housing 10 and the clamp body 1 in turn and connects with the corresponding pressing member 5. Under this structure, a lever 8 and a swing bolt 9 correspond to Push a pressing part 5 to move. Moreover, as shown in FIG. 1 , a plurality of swing bolts 9 and a plurality of sliders 2 are arranged staggered along the circumferential direction of the annular workpiece 14 to avoid interference or blocking. Wherein, the number of sliders 2 and the number of pressing parts 5 in the first positioning mechanism can be the same or different, as long as the radial expansion can be realized uniformly by a plurality of sliders 2 and implemented by a plurality of pressing parts 5 Evenly compress axially. In the embodiment shown in FIG. 1 , the number of pressing parts 5 is four, and the number of sliders 2 is also four, and the pressing parts 5 and the sliding blocks 2 are equiangularly spaced along the circumferential direction of the annular workpiece 16. interleaved with each other. It can be understood that the pressing members 5 and the sliders 2 can also be arranged alternately in other ways, as long as it is convenient to realize positioning without interference.

As mentioned above, the slide block 2 moves radially outwards for expanding the annular workpiece 14 for radial positioning. After the machining of the circular workpiece 14 is completed, the slider 2 needs to move radially inward so as to take the circular workpiece 14 out of the clamp. Therefore, for the convenience of operation, the clamp can also include a reset mechanism for resetting the slider 2. The reset mechanism can be arranged between the slider 2 and the first housing 10, or between the slider 2 and the clamp body. 1, the present invention is not limited to this.

As shown in Figure 2, the reset mechanism is arranged between the slide block 2 and the clip body 1. Specifically, the reset mechanism may include a stopper 3 and a first return spring 4, and the slide block 2 is provided with a mounting groove. A return spring 4 is accommodated in the installation groove, one end of the stopper 3 is fixed on the clamp body 1, and the other end of the stopper 3 abuts against the first return spring 4, which can provide the slider 2 with 14 is moved radially inward to loosen the restoring force of the annular workpiece 14. Wherein, the stopper 3 can be various components that can be connected to the first return spring 4 for stoppers, such as a plate or a cylindrical pin. In this embodiment, a cylindrical pin is mainly used, but not limited to a cylindrical pin. It can be seen from the above-mentioned reset mechanism that when the annular workpiece 14 is set on the clamp body 1, the tie rod 6 can be driven to move to the right in FIG. To radially locate the annular workpiece 14, due to the movement of the slide block 2, relatively, the stopper 3 or the cylindrical pin then compresses the first return spring 4 downward; when the pull rod 6 moves to the left in Fig. 2 , the slider 2 is no longer pressed outward by the taper sleeve 7, so it can move radially inward under the action of the first return spring 4, thereby releasing the expansion effect of the slider 2 on the circular workpiece 14 At this point, the annular workpiece 14 can be easily removed from the clamp body 1 .

In addition, for the pressing member 5, a reset structure is also required. As mentioned above, the pressing part 5 includes a mounting part 5a and a pressing plate part 5b. The mounting part 5a extends into the clip body 1 and is sleeved on the swing bolt 9. Therefore, under this structure, the first shell can A second return spring 12 for returning the pressing member 5 is arranged between the body 10 and the mounting portion 5a. That is, when the annular workpiece 14 is set on the clamp body 1, the pull rod 6 can be driven to move to the right in FIG. 9 connects the pressing part 5, and compresses the second return spring 12 at the same time; when the pull rod 6 moves to the left in Fig. The pressing part 5 is released under action, and finally, the pressing part 5 is rotated so that the flange of its pressing plate part 5b avoids the annular workpiece 14, so that the annular workpiece 14 can be taken off from the clamp body 1.

In addition, the clamp of the present invention may further include a second housing 11 detachably connected to the first housing, so as to facilitate installation of the clamp of the present invention. Specifically, when installing the fixture, the second housing 11 can be first assembled on the relevant components (such as the clamping part of the lathe), and then the fixture is installed on the first housing 10 and installed on the second housing 11, To package related components (such as pull rod 6, lever 8, etc.). Moreover, in the above embodiments, the circular workpiece 14 can be pre-positioned by setting the first housing 10 to have a diameter larger than that of the chuck body 1 . Preferably, a positioning ring 13 can also be provided at a position where the first housing 10 adjoins the clamp body 1 , so that pre-positioning can be performed through the positioning ring 13 .

The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (11)

1. one kind for clamping the fixture of annular workpiece, it is characterized in that, described fixture comprises the first detent mechanism for annular workpiece (14) described in swelling radially, for the second detent mechanism of annular workpiece (14) described in axial compression and be connected in the lazy-tongs of described the first detent mechanism and the second detent mechanism, these lazy-tongs are for the first detent mechanism and described the second detent mechanism described in simultaneously operating, so that described annular workpiece (14) is located or to be unclamped, and described fixture also comprises fluid pressure drive device, this fluid pressure drive device is connected with described lazy-tongs, to drive described lazy-tongs to carry out simultaneously operating.

2. according to claim 1 for clamping the fixture of annular workpiece, it is characterized in that, described the first detent mechanism comprises the clamp body (1) for sheathed described annular workpiece (14), this clamp body (1) is along being circumferentially with multiple chutes, in each described chute, contain slidably slide block (2), described fluid pressure drive device can drive described lazy-tongs simultaneously operating, and described slide block (2) is moving radially with annular workpiece (14) described in swelling radially along described annular workpiece (14) under the simultaneously operating of described lazy-tongs.

3. according to claim 2 for clamping the fixture of annular workpiece, it is characterized in that, described the second detent mechanism comprises the first housing (10) and compressing member (5), described the first housing (10) is connected with the first side of described clamp body (1), for an end face against described annular workpiece (14), described compressing member (5) is arranged on second side relative with described the first side of described clamp body (1) movably, described fluid pressure drive device can drive described lazy-tongs simultaneously operating, described compressing member (5) is mobile towards described clamp body (1) under the simultaneously operating of described lazy-tongs, the annular workpiece (14) described in axial grip to match with described the first housing (10).

4. according to claim 3 for clamping the fixture of annular workpiece, it is characterized in that, and described compressing member (5) can rotate, to switch between non-clip position and clip position, and at described clip position, described fluid pressure drive device can drive described lazy-tongs simultaneously operating, described compressing member (5) is mobile towards described clamp body (1) under the simultaneously operating of described lazy-tongs, the annular workpiece (14) described in axial grip to match with described the first housing (10).

5. according to claim 3ly it is characterized in that for clamping the fixture of annular workpiece, described lazy-tongs comprise pull bar (6), tapered sleeve (7), lever (8) and eyelet bolt (9),

The first end of described pull bar (6) is connected with described fluid pressure drive device after running through described clamp body (1), second end relative with described first end of described pull bar (6) can relatively move and be connected in described the first housing (10), described tapered sleeve (7) is set on described pull bar (6) regularly, described slide block (2) is slidably matched with the outer surface of described tapered sleeve (7)

One end of described lever (8) is articulated with the second end of described pull bar (6), the other end of described lever (8) is articulated with one end of described eyelet bolt (9), and the middle part of described lever (8) is articulated with described the first housing (10), the other end of described eyelet bolt (9) runs through successively described the first housing (10) and is connected with described compressing member (5) with after described clamp body (1)

Described fluid pressure drive device can drive described pull bar (6) mobile, to drive described tapered sleeve (7) move and drive described eyelet bolt (9) mobile by the leverage of described lever (8) along the axial linear of described annular workpiece (14), make to promote described slide block (2) along the moving radially of described annular workpiece (14) by being slidably matched of described tapered sleeve (7) and described slide block (2), and drive described compressing member (5) to move axially towards described clamp body (1) by described eyelet bolt (9).

6. according to claim 5 for clamping the fixture of annular workpiece, it is characterized in that, described fixture comprises multiple described levers (8), multiple described eyelet bolts (9) and the multiple described compressing member (5) circumferentially arranging along described annular workpiece (14), one end of each described lever (8) is articulated with the second end of described pull bar (6), the middle part of each described lever (8) is articulated with described the first housing (10), and the other end of each described lever (8) is articulated with one end of corresponding described eyelet bolt (9), the other end of corresponding described eyelet bolt (9) runs through successively described the first housing (10) and is connected with corresponding described compressing member (5) with after described clamp body (1), and multiple described eyelet bolts (9) and circumferentially the stagger setting of multiple described slide blocks (2) along described annular workpiece (14).

7. according to claim 3 for clamping the fixture of annular workpiece, it is characterized in that, described fixture also comprises the resetting-mechanism resetting for described slide block (2), this resetting-mechanism is arranged between described slide block (2) and described the first housing (10), or is arranged between described slide block (2) and described clamp body (1).

8. according to claim 7 for clamping the fixture of annular workpiece, it is characterized in that, described resetting-mechanism is arranged between described slide block (2) and described clamp body (1), and described resetting-mechanism comprises stop part (3) and the first back-moving spring (4), described slide block is provided with mounting groove in (2), described the first back-moving spring (4) is contained in described mounting groove, one end of described stop part (3) is fixed on described clamp body (1), the other end of described stop part (3) and described the first back-moving spring (4) connect, for providing the restoring force that radially moves inward to unclamp described annular workpiece (14) along described annular workpiece (14) to described slide block (2).

9. according to claim 3 for clamping the fixture of annular workpiece, it is characterized in that, described compressing member (5) comprises the installation portion (5a) being fixed to one another and compresses board (5b), described installation portion (5a) stretches in described clamp body (1) and is set on described eyelet bolt (9), described compression board (5b) is provided with the flange for compressing described annular workpiece (14), and between described the first housing (10) and described installation portion (5a), is provided with the second back-moving spring (12) resetting for described compressing member (5).

According to described in any one in claim 5 to 9 for clamping the fixture of annular workpiece, it is characterized in that, described fluid pressure drive device comprises apical axis (15), piston (16) and cylinder body (17), described apical axis (15) is fixedly connected with described clamp body (1), described piston (16) is fixedly set in described apical axis (15) and goes up and be resisted against on described clamp body (1), described cylinder body (17) is set in described apical axis (15) and goes up and pass through radially and be connected with described pull bar (6) through pull pin (19) of described apical axis (15), described cylinder body (17) is connected with described piston (16) and forms oil pocket, in the time that pressure oil injects described oil pocket, described cylinder body (17) above moves with respect to described piston (16) and drives described pull bar (6) mobile by described pulling pin (19) at described apical axis (15) under the effect of described pressure oil.

11. is according to claim 10 for clamping the fixture of annular workpiece, it is characterized in that, described fluid pressure drive device also comprises top (18), these top (18) comprise pouring orifice (18a), described top (18) comprise oil filler and the first oil circuit, and described the first oil circuit connects described pouring orifice (18a); And the end of described apical axis (15) is provided with patchhole (15a) and the second oil circuit, and described the second oil circuit is communicated in described oil pocket; In the time that described top (18) insert described patchhole (15a), described the first oil circuit and described the second oil circuit are connected, so that the pressure oil injecting from described pouring orifice (18a) is injected into described oil pocket by described the first oil circuit and described the second oil circuit.

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