Forward and reverse double-station machining clamp for cross ring of compressor

Abstract

The utility model belongs to the technical field of machinery, and relates to a clamp, in particular to a positive and negative double-station machining clamp for a cross ring of a compressor. The tool comprises a bottom plate, and the left side and the right side of the bottom plate are provided with a first positioning structure used for positioning the back face of the cross ring and a second positioning structure used for positioning the front face of the cross ring. The left side of the bottom plate is provided with a plurality of bottom supporting pieces, a first locking piece and a lifting type auxiliary supporting piece capable of doing reciprocating rectilinear motion in the vertical direction, and a first pressing structure used for pressing the front face of the cross ring is arranged above the first positioning structure. The two stations are arranged on the bottom plate, two workpieces can be clamped at the same time, the front faces and the back faces of the workpieces are machined respectively, the machining efficiency of the cross ring is improved, positioning is accurate, clamping is stable, and product accuracy is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery, and relates to a fixture, in particular to a positive and negative double-station processing fixture for a compressor cross ring. Background Art

[0002] The cross ring is one of the core components in a scroll compressor. The processing accuracy requirements for the compressor cross ring coupling are relatively high, and the cross ring processing fixture needs to ensure the accuracy of the product. The compressor cross ring is prone to additional deformation during processing due to insufficient part rigidity, resulting in product scrapping. Multiple-point support and clamping need to be added to the fixture to improve the fixture rigidity and reduce the additional deformation during processing, which can improve the processing accuracy of the compressor cross ring. Both the front and back sides of the compressor cross ring need to be processed. When the existing compressor cross ring fixtures process the front and back sides of the cross ring, due to the structural differences between the front and back sides of the cross ring, two different fixtures need to be equipped for clamping and processing. After the fixtures are separated, two processing personnel are required for processing, resulting in poor processing efficiency.

[0003] In order to overcome the deficiencies of the prior art, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a cross-sliding ring fixture for a turbo compressor [Application No.: 201210455844.6], which includes a plate-shaped mounting base and a support frame connected to the mounting base; a plurality of workpiece positioning grooves and positioning through holes are provided on the top surface of the mounting base, and these positioning grooves and positioning through holes are regularly arranged corresponding to both sides of the center line on the top surface of the mounting base; a pressing plate is provided above the positioning through hole, and the pressing plate is connected to the cylinder ejector rod installed on the bottom surface of the mounting base through a fixing member passing through the positioning through hole. However, in the process of using this solution, it is still difficult to synchronously clamp and process the front and back sides of the cross ring, and there is a defect that fixtures for the front and back sides of the compressor cross ring still need to be equipped. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a positive and negative double-station processing fixture for a compressor cross ring. The technical problem to be solved by the utility model is how to set two stations on the fixture, simultaneously clamp two workpieces, respectively process the front and back sides of the workpieces, and improve the processing efficiency of the cross ring.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A double-station processing fixture for the front and back sides of a compressor cross ring, comprising a bottom plate. On the left and right sides of the bottom plate, there are a first positioning structure for positioning the back side of the cross ring and a second positioning structure for positioning the front side of the cross ring. On the left side of the bottom plate, there are several bottom support members, a first locking member, and a lifting-type auxiliary support member that can reciprocate linearly in the vertical direction. Above the first positioning structure, there is a first pressing structure for pressing the front side of the cross ring. On the right side of the bottom plate, there is a second locking member that can reciprocate linearly towards or away from one end of the second positioning structure. Above the second positioning structure, there is a second pressing structure for pressing the back side of the cross ring.

[0007] In the above-mentioned double-station processing fixture for the front and back sides of a compressor cross ring, the first positioning structure includes a first positioning block arranged on the left side of the bottom plate. Inside the first positioning block, there are two cross-ring back-side convex positioning grooves that are symmetric along the center line of the first positioning block. The cross-ring back-side convex positioning grooves penetrate from left to right and open upwards.

[0008] In the above-mentioned double-station processing fixture for the front and back sides of a compressor cross ring, the first positioning block is provided with a positioning stop block whose head extends into one of the cross-ring back-side convex positioning grooves. The positioning stop block is fixed to the first positioning block by screws.

[0009] In the above-mentioned double-station processing fixture for the front and back sides of a compressor cross ring, the bottom support members include three support pins arranged on the left side of the bottom plate. The tops of the support pins are flat, and the support pins are arranged alternately with the first positioning block.

[0010] In the above-mentioned double-station processing fixture for the front and back sides of a compressor cross ring, the first locking member includes a first cylinder arranged on the left side of the bottom plate. A first piston rod is connected to the power shaft of the first cylinder, and the position of the first piston rod corresponds to that of the positioning stop block.

[0011] In the above-mentioned double-station processing fixture for the front and back sides of a compressor cross ring, the lifting-type auxiliary support member includes four support cylinders arranged on the left side of the bottom plate. The support cylinders are driven by an oil cylinder seat located at the bottom of the bottom plate. The support cylinders are arranged alternately with the support pins. The first pressing structure includes seven first oil cylinder pressing plates driven by an oil cylinder. Among them, three first oil cylinder pressing plates are arranged in one-to-one correspondence with the three support pins, and four first oil cylinder pressing plates are arranged in one-to-one correspondence with the four support cylinders.

[0012] In the above-mentioned processing fixture for the positive and negative double stations of the compressor cross ring, the second positioning structure includes a second positioning block arranged on the right side of the bottom plate. There are two cross-ring front convex positioning grooves symmetrically arranged along the center line of the second positioning block in the second positioning block. The cross-ring front convex positioning grooves penetrate from left to right and open upward. A positioning stop pin is arranged outside one of the cross-ring front convex positioning grooves.

[0013] In the above-mentioned processing fixture for the positive and negative double stations of the compressor cross ring, two positioning convex planes integrally formed with the second positioning block are further arranged on the second positioning block. The positioning convex planes are arranged staggeredly with the cross-ring front convex positioning grooves.

[0014] In the above-mentioned processing fixture for the positive and negative double stations of the compressor cross ring, the second locking member includes two second cylinders and a third cylinder arranged on the right side of the bottom plate. A second piston rod extending into the side wall of the cross-ring front convex positioning groove is connected to the power shaft of the second cylinder. The two second piston rods are parallel to each other. A third piston rod opposite to the positioning stop pin is connected to the power shaft of the third cylinder. The axis line of the third piston rod is perpendicular to the axis line of the second piston rod.

[0015] In the above-mentioned processing fixture for the positive and negative double stations of the compressor cross ring, the second pressing structure includes two second oil cylinder pressing plates driven by an oil cylinder. The second oil cylinder pressing plates are located directly above the positioning convex planes.

[0016] Compared with the existing technology, the advantages of the present utility model are as follows:

[0017] 1. By arranging two stations on the bottom plate, the present utility model can clamp two workpieces simultaneously, process the front and back sides of the workpieces respectively, improve the processing efficiency of the cross ring, have accurate positioning and stable clamping, and ensure the accuracy of the product.

[0018] 2. The present utility model ensures the accuracy of the product and prevents the product from being scrapped due to insufficient rigidity of the parts or additional deformation during processing.

[0019] Other advantages, objectives and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model.

[0021] Figure 2 is a schematic structural diagram of the present utility model in another direction.

[0022] Figure 3 is a schematic structural diagram of the left station of the present utility model.

[0023] Figure 4 It is a schematic structural diagram of the first positioning structure.

[0024] Figure 5 It is a schematic structural diagram of the right working station of the present utility model.

[0025] Figure 6 It is a schematic front structural diagram of the cross ring.

[0026] Figure 7 It is a schematic reverse structural diagram of the cross ring.

[0027] In the figure: base plate 1, first positioning structure 2, first positioning block 2a, reverse convex positioning groove 2b of the cross ring, positioning stop block 2c, second positioning structure 3, second positioning block 3a, front convex positioning groove 3b of the cross ring, positioning stop pin 3c, positioning convex plane 3d, bottom support member 4, support nail 4a, first locking member 5, first cylinder 5a, first piston rod 5b, lifting type auxiliary support member 6, support cylinder 6a, oil cylinder seat 6b, first pressing structure 7, first oil cylinder pressing plate 7a, second locking member 8, second cylinder 8a, third cylinder 8b, second piston rod 8c, third piston rod 8d, second pressing structure 9, second oil cylinder pressing plate 9a, cross ring 100. Specific embodiments

[0028] The present utility model will be further described below with reference to the accompanying drawings.

[0029] As Figures 1-7 shown, a processing fixture for the front and reverse double workstations of a compressor cross ring includes a base plate 1. The left and right sides of the base plate 1 are provided with a first positioning structure 2 for positioning the reverse side of the cross ring 100 and a second positioning structure 3 for positioning the front side of the cross ring 100. The left side of the base plate 1 is provided with a plurality of bottom support members 4, a first locking member 5, and a lifting type auxiliary support member 6 that can perform reciprocating linear motion in the vertical direction. Above the first positioning structure 2, a first pressing structure 7 for pressing the front side of the cross ring 100 is provided. The right side of the base plate 1 is provided with a second locking member 8 that can perform reciprocating linear motion along one end close to or away from the second positioning structure 3. Above the second positioning structure 3, a second pressing structure 9 for pressing the reverse side of the cross ring 100 is provided.

[0030] In this embodiment, during the machining process, a cross ring 100 to be machined is placed face up at the first positioning structure 2 on the left side of the bottom plate 1. The bottom support member 4 supports on the positioning plane of the cross ring 100. The first positioning structure 2 performs multi-directional positioning on the back of the cross ring 100. The first locking member 5 provides a clamping force to the side of the cross ring 100. The lifting type auxiliary support member 6 and the first pressing structure 7 provide clamping forces to the lower side and the upper side of the cross ring 100, realizing the restriction of the degrees of freedom of the X-axis, Y-axis, and Z-axis of the cross ring 100. When machining the front of the cross ring 100, the cross ring 100 will not have position offset and angular rotation, improving the machining accuracy. A cross ring 100 to be machined is placed face down at the second positioning structure 3 on the right side of the bottom plate 1. The second locking member 8 provides a clamping force to both sides of the cross ring 100. The second positioning structure 3 performs multi-directional positioning on the front of the cross ring 100. The second pressing structure 9 provides a clamping force to the upper side of the cross ring 100, realizing the restriction of the degrees of freedom of the X-axis, Y-axis, and Z-axis of the cross ring 100. When machining the back of the cross ring 100, the cross ring 100 will not have position offset and angular rotation, improving the machining accuracy. By setting two stations, this device can clamp two workpieces simultaneously, machining the front and back of the workpieces respectively, improving the processing efficiency of the cross ring, with precise positioning and stable clamping, ensuring the precision of the product.

[0031] Combined Figures 1-4 As shown, the first positioning structure 2 includes a first positioning block 2a provided on the left side of the bottom plate 1. The first positioning block 2a has two cross ring back convex positioning grooves 2b symmetrically arranged along the center line of the first positioning block 2a. The cross ring back convex positioning grooves 2b penetrate left and right and open upward. The first positioning block 2a is provided with a positioning block 2c with a head extending into one of the cross ring back convex positioning grooves 2b. The positioning block 2c is fixed to the first positioning block 2a by screws.

[0032] In this embodiment, when machining the front of the cross ring 100, the back convex of the cross ring 100 is placed in the cross ring back convex positioning groove 2b in the first positioning block 2a. The cross ring back convex positioning groove 2b positions the back of the cross ring 100, used to limit two degrees of freedom of the movement of the cross ring 100 in the X direction and the rotation around the Z axis. The positioning block 2c is used to limit the degree of freedom of the movement of the cross ring 100 along the Y axis.

[0033] The bottom support member 4 includes three support pins 4a provided on the left side of the bottom plate 1. The tops of the support pins 4a are flat, and the support pins 4a are arranged staggeredly with the first positioning block 2a.

[0034] In this embodiment, the support pin 4a is used to support on the positioning plane of the cross ring 100, restricting three degrees of freedom of the cross ring 100 in the Z-direction movement and rotation along the X and Y axes.

[0035] Combined with Figures 1-4 As shown, the first locking member 5 includes a first cylinder 5a disposed on the left side of the bottom plate 1. A first piston rod 5b is connected to the power shaft of the first cylinder 5a, and the first piston rod 5b corresponds to the position of the positioning stop block 2c.

[0036] In this embodiment, the first cylinder 5a drives the first piston rod 5b to move towards one end close to the cross ring 100. Through the cooperation between the first piston rod 5b and the positioning stop block 2c, the inner side of the cross ring 100 can closely abut against the positioning stop block 2c, achieving clamping and fixing of the cross ring 100 in the horizontal direction, with good stability.

[0037] The lifting type auxiliary support member 6 includes four support cylinders 6a disposed on the left side of the bottom plate 1. The support cylinders 6a are driven by an oil cylinder seat 6b located at the bottom of the bottom plate 1. The support cylinders 6a and the support pins 4a are arranged alternately. The first pressing structure 7 includes seven first oil cylinder pressing plates 7a driven by an oil cylinder. Among them, three first oil cylinder pressing plates 7a are arranged in one-to-one correspondence with three support pins 4a, and four first oil cylinder pressing plates 7a are arranged in one-to-one correspondence with four support cylinders 6a.

[0038] In this embodiment, the support cylinders 6a are driven by the oil cylinder seat 6b, and the first oil cylinder pressing plates 7a are driven by an oil cylinder. The reverse side of the cross ring 100 is supported and fixed by the support cylinders 6a, and the front side of the cross ring 100 is clamped by the first oil cylinder pressing plates 7a, realizing double-sided clamping and fixing, with good clamping effect.

[0039] The second positioning structure 3 includes a second positioning block 3a disposed on the right side of the bottom plate 1. The second positioning block 3a has two cross ring front convex positioning grooves 3b symmetrically arranged along the center line of the second positioning block 3a. The cross ring front convex positioning grooves 3b penetrate left and right and open upward. A positioning stop pin 3c is provided outside one of the cross ring front convex positioning grooves 3b. The second positioning block 3a is further provided with two positioning convex planes 3d integrally formed with the second positioning block 3a. The positioning convex planes 3d and the cross ring front convex positioning grooves 3b are arranged alternately.

[0040] In this embodiment, when performing reverse machining on the cross ring 100, the front protrusion of the cross ring 100 is placed in the cross ring front protrusion positioning groove 3b within the second positioning block 3a. The positioning protrusion plane 3d defines three degrees of freedom for the movement of the cross ring 100 in the Z direction and rotation along the X and Y axes. The cross ring front protrusion positioning groove 3b is used to define two degrees of freedom for the movement of the cross ring 100 in the Y direction and rotation around the Z axis. The positioning stop pin 3c is used to define the degree of freedom for the movement of the cross ring 100 in the X direction.

[0041] Combined with Figure 1 , Figure 5 As shown, the second locking member 8 includes two second cylinders 8a and one third cylinder 8b disposed on the right side of the bottom plate 1. A second piston rod 8c extending into the side wall of the cross ring front protrusion positioning groove 3b is connected to the power shaft of the second cylinder 8a. The two second piston rods 8c are parallel to each other. A third piston rod 8d disposed opposite to the positioning stop pin 3c is connected to the power shaft of the third cylinder 8b. The axis line of the third piston rod 8d is perpendicular to the axis line of the second piston rod 8c.

[0042] In this embodiment, the front protrusion side of the cross ring 100 located in the cross ring front protrusion positioning groove 3b is clamped by the second piston rod 8c, and one end of the cross ring 100 away from the positioning stop pin 3c is clamped by the third piston rod 8d to ensure that the outer end of the cross ring 100 abuts against the positioning stop pin 3c, achieving multi-directional fixation.

[0043] Combined with Figure 5 As shown, the second pressing structure 9 includes two second oil cylinder pressing plates 9a driven by an oil cylinder. The second oil cylinder pressing plates 9a are located directly above the positioning protrusion plane 3d.

[0044] In this embodiment, the reverse side of the cross ring 100 is clamped and fixed by the second oil cylinder pressing plates 9a.

[0045] The working principle of the present utility model is:

[0046] When machining the front side of the cross ring 100, place the convex on the reverse side of the cross ring 100 in the cross ring reverse convex positioning groove 2b within the first positioning block 2a. Position the reverse side of the cross ring 100 through the cross ring reverse convex positioning groove 2b, which is used to limit two degrees of freedom of the cross ring 100 in the X-direction movement and rotation around the Z-axis. The positioning stop block 2c is used to limit the degree of freedom of the cross ring 100 in the Y-axis direction movement. The support pin 4a is used to support on the positioning plane of the cross ring 100, limiting three degrees of freedom of the cross ring 100 in the Z-direction movement and rotation along the X and Y axes. Drive the first piston rod 5b to move towards the end close to the cross ring 100 through the first cylinder 5a. Through the cooperation between the first piston rod 5b and the positioning stop block 2c, the inner side of the cross ring 100 can closely adhere to the positioning stop block 2c, achieving clamping and fixing of the cross ring 100 in the horizontal direction with better stability. The support cylinder 6a is driven by the oil cylinder seat 6b, and the first oil cylinder pressing plate 7a is driven by the oil cylinder. Support and fix the reverse side of the cross ring 100 through the support cylinder 6a, and clamp the front side of the cross ring 100 through the first oil cylinder pressing plate 7a to achieve double-sided clamping and fixing with good clamping effect.

[0047] When machining the reverse side of the cross ring 100, place the convex on the front side of the cross ring 100 in the cross ring front convex positioning groove 3b within the second positioning block 3a. Limit three degrees of freedom of the cross ring 100 in the Z-direction movement and rotation along the X and Y axes through the positioning convex plane 3d. The cross ring front convex positioning groove 3b is used to limit two degrees of freedom of the cross ring 100 in the Y-direction movement and rotation around the Z-axis. The positioning stop pin 3c is used to limit the degree of freedom of the cross ring 100 in the X-axis direction movement. Clamp the side of the convex on the front side of the cross ring 100 located in the cross ring front convex positioning groove 3b of the cross ring 100 through the second piston rod 8c, and clamp the end of the cross ring 100 away from the positioning stop pin 3c through the third piston rod 8d to ensure that the outer end of the cross ring 100 abuts against the positioning stop pin 3c to achieve multi-directional fixing. Clamp and fix the reverse side of the cross ring 100 through the second oil cylinder pressing plate 9a.

[0048] A number of oil holes are drilled on the bottom plate 1. The oil holes connect the oil circuits of the pressing cylinders at the positions of the three support pins 4a at the left working station together, so that the pressing cylinders at the positions of the support pins 4a can be pressed together and released together. The oil holes connect the oil circuits of the pressing cylinders at the positions of the four support cylinders 6a at the left working station together, so that the pressing cylinders at the positions of the four support cylinders 6a can be pressed together and released together. The inner hexagon plug screws block the useless oil ports to prevent oil leakage. An oil circuit for the support cylinder 6a is opened on the oil cylinder seat 6b at the left working station below the bottom plate 1. The oil circuit for the support cylinder 6a connects the oil circuits of the four support cylinders 6a together, so that the four support cylinders 6a can be jacked out together and retracted together. A number of oil holes are drilled on the bottom plate 1. The oil holes connect the oil circuits of the two oil cylinders at the right working station together, so that the two oil cylinders can be pressed together and released together. The inner hexagon plug screws block the useless oil ports to prevent oil leakage.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model.

[0050] Although terms such as base plate 1, first positioning structure 2, first positioning block 2a, reverse cross-ring convex positioning groove 2b, positioning stop block 2c, second positioning structure 3, second positioning block 3a, front cross-ring convex positioning groove 3b, positioning stop pin 3c, positioning convex plane 3d, bottom support member 4, support nail 4a, first locking member 5, first cylinder 5a, first piston rod 5b, lifting type auxiliary support member 6, support cylinder 6a, oil cylinder seat 6b, first pressing structure 7, first oil cylinder pressing plate 7a, second locking member 8, second cylinder 8a, third cylinder 8b, second piston rod 8c, third piston rod 8d, second pressing structure 9, second oil cylinder pressing plate 9a, cross-ring 100 are used more frequently in this text, the possibility of using other terms is not excluded. The use of these terms is only for more conveniently describing and explaining the essence of the present utility model, and interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A double-station processing fixture for a compressor cross ring, comprising a bottom plate (1), characterized in that: The left and right sides of the bottom plate (1) are provided with a first positioning structure (2) for positioning the back side of the cross ring (100) and a second positioning structure (3) for positioning the front side of the cross ring (100); the left side of the bottom plate (1) is provided with a plurality of bottom support members (4), a first locking member (5) and a lifting auxiliary support member (6) capable of reciprocating linear motion in a vertical direction; a first clamping structure (7) for clamping the front side of the cross ring (100) is provided above the first positioning structure (2); a second locking member (8) capable of reciprocating linear motion along one end close to or away from the second positioning structure (3) is provided on the right side of the bottom plate (1); and a second clamping structure (9) for clamping the back side of the cross ring (100) is provided above the second positioning structure (3).

2. A double-station processing fixture for a compressor cross ring according to claim 1, characterized in that: The first positioning structure (2) comprises a first positioning block (2a) arranged on the left side of the base plate (1), the first positioning block (2a) having two cross-ring reverse side raised positioning grooves (2b) symmetrically arranged along the center line of the first positioning block (2a), the cross-ring reverse side raised positioning grooves (2b) penetrating from left to right and opening upwards.

3. A double-station processing fixture for a compressor cross ring according to claim 2, characterized in that: The first positioning block (2a) is provided with a positioning block (2c) whose head extends into a raised positioning groove (2b) on the back side of one of the cross rings, and the positioning block (2c) is fixed to the first positioning block (2a) by screws.

4. A double-station processing fixture for a compressor cross ring according to claim 3, characterized in that: The bottom support member (4) comprises three support nails (4a) arranged on the left side of the bottom plate (1); the top of the support nails (4a) is flat; and the support nails (4a) and the first positioning block (2a) are arranged in an alternating manner.

5. A double-station processing fixture for a compressor cross ring according to claim 4, characterized in that: The first locking member (5) comprises a first cylinder (5a) arranged on the left side of the base plate (1), a first piston rod (5b) being connected to a power shaft of the first cylinder (5a), and the position of the first piston rod (5b) corresponds to that of the positioning stopper (2c).

6. A double-station processing fixture for a compressor cross ring according to claim 5, characterized in that: The lifting auxiliary support member (6) comprises four support cylinders (6a) arranged on the left side of the base plate (1), the support cylinders (6a) are driven by a cylinder seat (6b) located at the bottom of the base plate (1), the support cylinders (6a) and the support nails (4a) are arranged alternately, and the first clamping structure (7) comprises seven first cylinder pressure plates (7a) driven by the cylinders, wherein three first cylinder pressure plates (7a) are arranged opposite to three support nails (4a) one by one, and wherein four first cylinder pressure plates (7a) are arranged opposite to four support cylinders (6a) one by one.

7. A double-station machining fixture for a compressor cross ring according to any one of claims 1 to 5, characterized in that: The second positioning structure (3) comprises a second positioning block (3a) arranged on the right side of the base plate (1), the second positioning block (3a) having two cross-ring front protruding positioning grooves (3b) symmetrically arranged along the center line of the second positioning block (3a), the cross-ring front protruding positioning grooves (3b) penetrating from left to right and opening upward, and a positioning stop pin (3c) is arranged on the outer side of one of the cross-ring front protruding positioning grooves (3b).

8. A double-station machining fixture for a compressor cross ring according to claim 7, characterized in that: The second positioning block (3a) is also provided with two positioning protruding planes (3d) integrally formed with the second positioning block (3a), and the positioning protruding planes (3d) are arranged alternately with the protruding positioning grooves (3b) on the front side of the cross ring.

9. A double-station processing fixture for a compressor cross ring according to claim 8, characterized in that: The second locking member (8) comprises two second cylinders (8a) and a third cylinder (8b) which are arranged on the right side of the base plate (1); the power shaft of the second cylinder (8a) is connected with a second piston rod (8c) which extends into the side wall of the raised positioning groove (3b) on the front face of the cross ring; the two second piston rods (8c) are parallel to each other; the power shaft of the third cylinder (8b) is connected with a third piston rod (8d) which is arranged opposite to the positioning stop pin (3c); the axis of the third piston rod (8d) is perpendicular to the axis of the second piston rod (8c).

10. A double-station machining fixture for a compressor cross ring according to claim 8, characterized in that: The second clamping structure (9) comprises two second cylinder pressure plates (9a) driven by a cylinder, and the second cylinder pressure plates (9a) are located directly above the positioning protrusion plane (3d).

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