Hydraulic clamp for detecting metal parts

Abstract

The invention relates to the technical field of detection hydraulic clamps, in particular to a hydraulic clamp for metal part detection, which comprises a plurality of groups of outer clamps and inner clamps, the outer clamps and the inner clamps in each group correspond to each other, the outer clamps are mounted on the outer side of the end face edge of a bearing inner ring, and the inner sides of the outer clamps are matched with the outer side of the end face edge of the bearing inner ring. The outer clamping piece applies load downwards, under the action of the arc face of the edge of the end face of the bearing inner ring, downward pressure and force perpendicular to the tangent line of the arc face are generated, the inner clamping piece is attached to the edge of the inner wall of the bearing inner ring, and the inner clamping piece applies load in the direction away from the ball center of the bearing inner ring. In the clamping process, the distance between the outer clamping piece and the inner clamping piece is very small, the acting directions of the force are opposite, and the acting position and the acting direction of the force are far away from the free gap between the bearing inner ring and the bearing outer ring, so that the elastic deformation disturbance to the free gap between the bearing inner ring and the bearing outer ring is smaller in the clamping process.

Description

Technical Field

[0001] This invention relates to the field of hydraulic clamping technology, specifically to hydraulic clamping for inspecting metal parts. Background Technology

[0002] Spherical plain bearings are widely used in hatches, control systems, and other parts. During bearing assembly, the shape and size errors of the bearing housing and journal can lead to a decrease in bearing clearance and an increase in frictional torque after assembly, which affects the bearing's performance. Therefore, it is essential to measure the frictional torque after the bearing is assembled. The bearing needs to be clamped during the measurement of frictional torque. The clamping of the bearing is divided into end face clamping and inner surface clamping. End face clamping has a larger lateral span. The schematic diagrams of the two clamping methods are shown in Figure 1. Figure 1 The left side of the middle is the end face clamping. Figure 1 The right side of the image shows the inner surface being bulged.

[0003] However, during the clamping process of the bearing, the inner ring inevitably undergoes elastic deformation, which changes the preload of the bearing and thus changes the friction torque of the bearing.

[0004] Because bearings often undergo elastic deformation towards the side that is not under force and has free space during the clamping process, this invention changes the clamping position and angle so that the clamping forces can interact and cancel each other out within the confined space, thereby minimizing the preload of the bearing and reducing the additional frictional torque generated during clamping to a minimum. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic clamp for the inspection of metal parts, which, by changing the clamping position and angle, allows the clamping forces to interact and cancel each other out within a confined space, thereby minimizing the preload of the bearing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic clamp for inspecting metal parts, comprising multiple sets of outer clamps and inner clamps, wherein the outer clamps and inner clamps in each set correspond to each other; The outer clamp is installed on the outer side of the end face edge of the bearing inner ring. The inner side of the outer clamp matches the outer side of the end face edge of the bearing inner ring. The outer clamp applies a downward load, and under the action of the arc surface of the end face edge of the bearing inner ring, it generates a downward pressure and a force perpendicular to the tangent of the arc surface. The inner clamp fits against the inner wall edge of the bearing inner ring and applies a load in a direction away from the center of the bearing inner ring, generating an upward force and a force away from the center of the bearing inner ring at the end face edge of the bearing inner ring. The bearing is clamped by multiple sets of external and internal clamps, thereby preventing elastic deformation from occurring in the free gap between the inner and outer rings of the bearing and reducing the impact on the original static friction of the bearing.

[0007] In end face clamping, because the two clamping surfaces are far apart, the far end of the clamping surface is more likely to deform when the clamping surfaces are clamped. During inner surface expansion, because the force acts directly on the free gap between the inner and outer rings of the bearing, the resulting elastic deformation is greater than that of end face clamping. The clamping method of the present invention makes the distance between the two clamping parts, namely the outer clamping part and the inner clamping part, very small, and the forces act in opposite directions. Moreover, the position and direction of the forces are far away from the free gap between the inner ring and the outer ring of the bearing, thereby making the elastic deformation disturbance of the free gap between the inner ring and the outer ring of the bearing smaller during the clamping process. Furthermore, because the outer clamp is in close contact with the axial and radial positions of the inner ring edge of the bearing, the outer clamp can restrict the deformation space, eliminate the basis for the free space of deformation, and thus further prevent elastic deformation of the inner ring of the bearing. In this invention, multiple sets of outer and inner clamps are circumferentially and evenly distributed on both sides of the inner ring of the bearing to ensure stability during the clamping process. As a preferred embodiment of the hydraulic clamp for metal parts inspection according to the present invention, rubber pads are provided on both the outer clamp and the inner clamp in the direction of contact with the inner ring of the bearing, which serve to increase friction, prevent bearing scratches, and provide elastic space.

[0008] Preferably, the hydraulic clamp for metal parts inspection according to the present invention further includes a female seat, a female rod fixedly connected to the right end of the female seat, a first piston slidably connected to the inner side of the female rod, a male rod fixedly connected to the end of the first piston away from the female seat, and a slide block fixedly connected to the end of the male rod away from the female seat. The outer side of the male rod, the side of the first piston away from the female seat, and the inner side of the female rod form a hydraulic cavity. When oil is pumped into the hydraulic cavity, the pressure inside the hydraulic cavity increases. Under the action of the pressure, the slide moves towards the side closer to the female seat.

[0009] As a preferred embodiment of the hydraulic clamp for metal parts inspection according to the present invention, a connecting rod is rotatably connected to the outer side of the slide via a hinge, the other end of the connecting rod is inclined toward the mother seat, and the other end of the connecting rod is rotatably connected to the inner clamping member via a hinge. When the slide moves toward the side closer to the mother seat, the clamping force of the inner clamping member on the inner wall of the bearing inner ring gradually increases.

[0010] Preferably, in the hydraulic clamp for metal parts inspection of the present invention, the outer side of the main rod is rotatably connected to an elastic telescopic rod via a hinge, and the other end of the elastic telescopic rod is rotatably connected to one side of the connecting rod via a hinge. The elastic telescopic rod is used to provide elastic driving force, allowing the inner clamp to adhere to the inner wall of the bearing inner ring.

[0011] In this invention, it is necessary to overcome the problem of the elastic telescopic rod placing the inner clamp inside the bearing inner ring. This can be achieved by pulling the connecting rod with a rope, allowing multiple connecting rods to be laid down simultaneously, and then placed inside the bearing inner ring. The elastic telescopic rod in this invention is an elastic element that can provide elastic support force. It is existing technology and will not be elaborated further here. Under the action of the elastic telescopic rod, the inner clamp can adhere to the inner wall of the bearing inner ring. Then, as the slide moves, the clamping force of the inner clamp on the inner wall of the bearing inner ring gradually increases. Preferably, in the hydraulic fixture for metal parts inspection according to the present invention, an oil injection valve is fixedly connected to the outside of the main rod. The oil injection valve is connected to the inside of the hydraulic cavity. After the oil injection valve is connected to the external pressurized oil pipe, oil can be injected into the hydraulic cavity. An oil outlet valve is also fixedly connected to the outside of the main rod, and the oil outlet valve is connected to the inside of the hydraulic cavity. Preferably, in the hydraulic clamp of the present invention for the inspection of metal parts, an outer rod is fixedly connected to the outer side of the mother rod, a second piston is slidably connected to the inner side of the outer rod, an inner rod is fixedly connected to the side of the second piston away from the mother rod, and a connecting seat is fixedly connected to the top of the inner rod. The second piston forms an oil chamber on the side away from the mother rod, the outer side of the inner rod, and the inner side of the outer rod. When oil is pumped into the oil chamber, the connecting seat moves towards the side closer to the mother rod.

[0012] The sliding connection between the sub-rod and the main rod, and the sliding connection between the inner rod and the outer rod, are equipped with sliding seals.

[0013] Preferably, in the hydraulic clamp for metal parts inspection according to the present invention, the side of the connecting seat away from the mother seat is fixedly connected to the outer clamp. When the connecting seat moves towards the side closer to the mother rod, the clamping force of the outer clamp on the edge of the inner ring end face of the bearing also gradually increases.

[0014] As a preferred embodiment of the hydraulic clamp for metal parts inspection according to the present invention, an oil inlet pipe is fixedly connected to the outer side of the outer rod and the outer side of the mother rod. The oil cavity in the outer rod and the hydraulic cavity in the mother rod are connected through the oil inlet pipe. When oil is injected through the oil injection valve, the outer clamp and the inner clamp can move synchronously, which can effectively avoid local elastic deformation during the entire clamping process.

[0015] During the entire oil injection process, because the hydraulic chamber and the oil chamber are connected, that is, the slide and the connecting seat move synchronously, and the load torque generated by the slide and the connecting seat can be distributed by pre-planning the surface area parameters of the first piston and the second piston. The larger the piston surface area, the larger the load torque is distributed, so that the clamping force can interact and cancel each other in the confined space, thereby minimizing the preload of the bearing. Both the mother rod and the outer rod have exhaust holes at their tails to compensate for the gas space during the movement of the first or second piston.

[0016] Preferably, in the hydraulic clamp of the present invention for the inspection of metal parts, the female seat is fixed by a fixing frame, wherein at least one fixing frame can be moved by a slide rail for clamping and installing the bearing.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This hydraulic clamp for inspecting metal parts has an outer clamp installed on the outer edge of the bearing inner ring's end face. The inner side of the outer clamp matches the outer edge of the bearing inner ring's end face. The outer clamp applies a downward load, generating a downward pressure and a force perpendicular to the tangent of the arc surface under the action of the bearing inner ring's end face edge. The inner clamp is attached to the inner wall edge of the bearing inner ring, applying a load away from the center of the bearing inner ring. This generates an upward force and a force away from the center of the bearing inner ring's end face edge. The clamping of the bearing is achieved by multiple sets of outer and inner clamps, thereby preventing elastic deformation from occurring in the free gap between the bearing inner and outer rings and reducing the impact on the original static friction of the bearing.

[0018] 2. The hydraulic clamp for metal parts inspection, and the clamping method of the present invention, makes the distance between the two clamping parts, namely the outer clamping part and the inner clamping part, very small, and the forces act in opposite directions, and the position and direction of the forces are far away from the free gap between the inner ring and the outer ring of the bearing, thereby making the elastic deformation disturbance of the free gap between the inner ring and the outer ring of the bearing smaller during the clamping process. 3. This hydraulic clamp for inspecting metal parts, because the outer clamp is in close contact with the axial and radial position of the inner ring edge of the bearing, allows the outer clamp to restrict the deformation space, eliminate the basis for free space for deformation, and thus further prevent elastic deformation of the inner ring of the bearing.

[0019] 4. This hydraulic clamp for inspecting metal parts allows the outer and inner clamps to move synchronously when oil is injected through the injection valve. This effectively prevents localized elastic deformation during the entire clamping process. During the oil injection process, because the hydraulic chamber and the oil chamber are connected, the slide and the connecting seat move synchronously. The load torque generated by the slide and the connecting seat can be distributed by pre-planning the surface area parameters of the first and second pistons. The larger the piston surface area, the larger the load torque received. This allows the clamping forces to interact and cancel each other out within the confined space, thereby minimizing the preload of the bearing. Attached Figure Description

[0020] Figure 1 A schematic diagram of the clamping method for measuring the frictional torque of an existing bearing. Figure 2 This is a schematic diagram of the clamping method for bearing clamping according to the present invention; Figure 3 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 4 This is a schematic diagram of the internal cross-sectional structure during bearing clamping according to the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure at point A; Figure 6 This is a cross-sectional view of the internal structure of the main rod and the second telescopic rod of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the structure at point B; Figure 8 For the present invention Figure 6 A schematic diagram of the structure at point C; Figure 9 This is a schematic diagram of the internal structure of the elastic telescopic rod of the present invention.

[0021] In the diagram: 1. Bearing; 1a. Bearing outer ring; 1b. Bearing inner ring; 2. Outer clamp; 3. Inner clamp; 4. Female seat; 5. Female rod; 51. First piston; 52. Female rod; 6. Oil injection valve; 7. Vent hole; 8. Outer rod; 81. Second piston; 82. Inner rod; 9. Connecting seat; 10. Oil inlet pipe; 11. Slide seat; 12. Elastic telescopic rod; 13. Connecting rod; 14. Fixing frame; 15. Rubber pad; 16. Oil outlet valve. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, please refer to Figure 1-5 The present invention provides a technical solution: a hydraulic clamp for inspecting metal parts, comprising multiple sets of outer clamps 2 and inner clamps 3, wherein the outer clamps 2 and inner clamps 3 in each set correspond to each other; The outer clamp 2 is installed on the outer side of the end face edge of the inner ring 1b of the bearing. The inner side of the outer clamp 2 matches the outer side of the end face edge of the inner ring 1b of the bearing. The outer clamp 2 applies a downward load, and under the action of the arc surface of the end face edge of the inner ring 1b of the bearing, it generates a downward pressure and a force perpendicular to the tangent of the arc surface. The inner clamp 3 is attached to the inner wall edge of the bearing inner ring 1b. The inner clamp 3 applies a load in a direction away from the center of the bearing inner ring 1b, generating an upward force and a force away from the center of the bearing inner ring 1b at the end face edge. The bearing 1 is clamped by multiple sets of outer clamps 2 and inner clamps 3, thereby avoiding elastic deformation in the free gap between the inner ring 1b and the outer ring 1a of the bearing and reducing the impact on the original static friction of the bearing 1.

[0024] In end face clamping, because the two clamping surfaces are far apart, the far end of the clamping surface is more likely to deform when the clamping surfaces are clamped. During inner surface expansion, because the force acts directly on the free gap between the inner ring 1b and the outer ring 1a of the bearing, the resulting elastic deformation is greater than that of end face clamping. The clamping method of the present invention makes the distance between the two clamping parts, namely the outer clamping part 2 and the inner clamping part 3, very small, and the forces act in opposite directions. Moreover, the position and direction of the forces are far away from the free gap between the inner ring 1b and the outer ring 1a of the bearing, thereby making the elastic deformation disturbance of the free gap between the inner ring 1b and the outer ring 1a of the bearing smaller during the clamping process. Furthermore, because the outer clamp 2 is in close contact with the axial and radial positions of the inner ring 1b of the bearing, the outer clamp 2 can restrict the deformation space, eliminate the basis for the free space of deformation, and thus further prevent the elastic deformation of the inner ring 1b of the bearing. In this invention, multiple sets of outer clamps 2 and inner clamps 3 are circumferentially and evenly distributed on both sides of the inner ring 1b of the bearing to ensure stability during the clamping process. As a preferred embodiment of the hydraulic clamp for metal parts inspection according to the present invention, both the outer clamp 2 and the inner clamp 3 are provided with rubber pads 15 in the direction of contact with the inner ring 1b of the bearing, which are used to increase friction, prevent the bearing 1 from being scratched and provide elastic space.

[0025] Example 2 is a further improvement upon Example 1. Please refer to Example 1. Figures 1-9 The hydraulic clamp also includes a female seat 4, a female rod 5 is fixedly connected to the right end of the female seat 4, a first piston 51 is slidably connected to the inner side of the female rod 5, a male rod 52 is fixedly connected to the end of the first piston 51 away from the female seat 4, and a slide block 11 is fixedly connected to the end of the male rod 52 away from the female seat 4. A hydraulic cavity is formed on the outer side of the male rod 52, the side of the first piston 51 away from the female seat 4, and the inner side of the female rod 5. When oil is pumped into the hydraulic cavity, the pressure in the hydraulic cavity increases. Under the action of the pressure, the slide 11 moves towards the side closer to the female seat 4.

[0026] Specifically, the outer side of the slide 11 is rotatably connected to the connecting rod 13 via a hinge. The other end of the connecting rod 13 is inclined toward the mother seat 4. The other end of the connecting rod 13 is rotatably connected to the inner clamp 3 via a hinge. When the slide 11 moves toward the side closer to the mother seat 4, the clamping force of the inner clamp 3 on the inner wall of the bearing inner ring 1b gradually increases.

[0027] Specifically, the outer side of the mother rod 5 is rotatably connected to an elastic telescopic rod 12 via a hinge, and the other end of the elastic telescopic rod 12 is rotatably connected to one side of the connecting rod 13 via a hinge. The elastic telescopic rod 12 is used to provide elastic driving force so that the inner clamp 3 can adhere to the inner wall of the bearing inner ring 1b.

[0028] In this invention, it is necessary to overcome the problem of the elastic telescopic rod 12 placing the inner clamp 3 inside the bearing inner ring 1b. This can be achieved by pulling the connecting rod 13 with a rope, causing multiple connecting rods 13 to be laid down simultaneously, and then placed inside the bearing inner ring 1b. Under the action of the elastic telescopic rod 12, the inner clamp 3 can stick to the inner wall of the bearing inner ring 1b. Then, as the slide block 11 moves, the clamping force of the inner clamp 3 on the inner wall of the bearing inner ring 1b gradually increases. The elastic telescopic rod 12 in this invention is as follows Figure 9 As shown, its elastic driving force is provided by the spring in the middle, which is existing technology and will not be elaborated further here; Specifically, an oil injection valve 6 is fixedly connected to the outside of the mother rod 5. The oil injection valve 6 is connected to the inside of the hydraulic cavity. After the oil injection valve 6 is connected to the external pressurized oil pipe, oil can be injected into the hydraulic cavity. An oil outlet valve 6 is also fixedly connected to the outside of the main rod 5, and the oil outlet valve 6 is connected to the inside of the hydraulic cavity. The pressurized oil pipe is powered by a plunger pump or other hydraulic pump. The oil injection valve 6 is also a check valve. The oil outlet valve 16 discharges oil to reset the clamp. The oil outlet valve 16 achieves sealing by rotation. This is existing technology and will not be elaborated further here. Specifically, an outer rod 8 is fixedly connected to the outer side of the mother rod 5, a second piston 81 is slidably connected to the inner side of the outer rod 8, an inner rod 82 is fixedly connected to the side of the second piston 81 away from the mother rod 5, and a connecting seat 9 is fixedly connected to the top of the inner rod 82. The second piston 81 forms an oil chamber on the side away from the mother rod 5, the outer side of the inner rod 82, and the inner side of the outer rod 8. When pumping oil into the oil chamber, the connecting seat 9 moves towards the side closer to the mother seat 4.

[0029] The sliding connection between the sub-rod 52 and the mother rod 5, and the sliding connection between the inner rod 82 and the outer rod 8 are provided with sliding seal treatment.

[0030] Specifically, the side of the connecting seat 9 away from the female seat 4 is fixedly connected to the outer clamp 2. When the connecting seat 9 moves towards the side closer to the female rod 5, the clamping force of the outer clamp 2 on the edge of the inner ring 1b end face of the bearing also gradually increases.

[0031] Specifically, the outer rod 8 and the outer side of the mother rod 5 are fixedly connected with an oil inlet pipe 10. The oil chamber in the outer rod 8 and the hydraulic chamber in the mother rod 5 are connected through the oil inlet pipe 10. When oil is injected through the oil injection valve 6, the outer clamp 2 and the inner clamp 3 can move synchronously, which can effectively avoid local elastic deformation during the entire clamping process.

[0032] During the entire oil injection process, because the hydraulic chamber and the oil chamber are connected, that is, the slide 11 and the connecting seat 9 move synchronously, and the load torque generated by the slide 11 and the connecting seat 9 can be distributed by pre-planning the surface area parameters of the first piston 51 and the second piston 81. The larger the piston surface area, the larger the load torque is distributed, so that the clamping force can interact and cancel each other in the confined space, thereby minimizing the preload of the bearing. Both the mother rod 5 and the outer rod 8 have exhaust holes 7 at their tails for ventilation, which are used to compensate for the gas space when the first piston 51 or the second piston 81 moves.

[0033] Specifically, the female seat 4 is fixed by a fixing bracket 14, at least one of which can be moved by a slide rail for clamping and installing the bearing 1.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Hydraulic clamp for the detection of metal parts, comprising a plurality of outer jaws (2) and inner jaws (3), characterized in that: The outer clamp (2) and the inner clamp (3) in each group correspond to each other; The outer clamp (2) is installed on the outer side of the end face edge of the bearing inner ring (1b), the inner side of the outer clamp (2) is matched with the outer side of the end face edge of the bearing inner ring (1b), the outer clamp (2) applies a load downward, under the action of the arc surface of the end face edge of the bearing inner ring (1b), a downward pressure and a force perpendicular to the tangent of the arc surface are generated; The inner clamp (3) is attached to the inner wall edge of the bearing inner ring (1b), the inner clamp (3) applies a load away from the ball center of the bearing inner ring (1b), an upward force and a force away from the ball center of the bearing inner ring (1b) are generated on the end face edge of the bearing inner ring (1b); Through the clamping of multiple groups of outer clamps (2) and inner clamps (3), the bearing (1) is clamped, so that the elastic deformation is generated in the free gap of the bearing inner ring (1b) and the bearing outer ring (1a), and the influence on the original static friction of the bearing (1) is reduced.

2. Hydraulic fixture for the detection of metal parts according to claim 1, characterized in that: The outer clamp (2) and the inner clamp (3) are provided with rubber pads (15) in the direction of attaching the bearing inner ring (1b), which are used to increase the friction, prevent the bearing (1) from being scratched, and provide elastic space.

3. Hydraulic clamp for the detection of metal parts according to claim 1 or 2, characterized in that: The hydraulic clamp further comprises a female seat (4), a female rod (5) fixedly connected to the right end of the female seat (4), a first piston (51) slidably connected to the inner side of the female rod (5), a male rod (52) fixedly connected to the end of the first piston (51) away from the female seat (4), and a sliding seat (11) fixedly connected to the end of the male rod (52) away from the female seat (4); The outer side of the male rod (52), the side of the first piston (51) away from the female seat (4), and the inner side of the female rod (5) form a hydraulic cavity, when oil is pumped into the hydraulic cavity, the sliding seat (11) moves towards the female seat (4).

4. The hydraulic fixture for metal part inspection of claim 3, wherein: The outer side of the sliding seat (11) is rotatably connected to a connecting rod (13) through a hinge, the other end of the connecting rod (13) is inclined towards the female seat (4), the other end of the connecting rod (13) is rotatably connected to the inner clamp (3) through a hinge, and when the sliding seat (11) moves towards the female seat (4), the clamping force of the inner clamp (3) on the inner wall of the bearing inner ring (1b) gradually increases.

5. The hydraulic fixture for metal part inspection of claim 4, wherein: The outer side of the female rod (5) is rotatably connected to an elastic telescopic rod (12) through a hinge, and the other end of the elastic telescopic rod (12) is rotatably connected to one side of the connecting rod (13) through a hinge; The elastic telescopic rod (12) is used to provide an elastic driving force, so that the inner clamp (3) can be attached to the inner wall of the bearing inner ring (1b).

6. The hydraulic fixture for metal part inspection of claim 5, wherein: The outer side of the female rod (5) is fixedly connected to an oil injection valve (6), the oil injection valve (6) is in communication with the inner side of the hydraulic cavity, and after the oil injection valve (6) is connected to an external oil pipe with pressure, oil can be injected into the hydraulic cavity; The outer side of the female rod (5) is further fixedly connected to an oil outlet valve (6), and the oil outlet valve (6) is in communication with the inner side of the hydraulic cavity.

7. The hydraulic fixture for metal part inspection of claim 6, wherein: The outer side of the female rod (5) is fixedly connected to an outer rod (8), the inner side of the outer rod (8) is slidably connected to a second piston (81), the side of the second piston (81) away from the female rod (5) is fixedly connected to an inner rod (82), and the top end of the inner rod (82) is fixedly connected to a connecting seat (9). The second piston (81) is formed with an oil cavity on the side away from the female rod (5), the outer side of the inner rod (82) and the inner side of the outer rod (8), when pumping oil into the oil cavity, the connecting seat (9) moves towards the side close to the female seat (4).

8. The hydraulic fixture for metal part inspection of claim 7, wherein: The connecting seat (9) is fixedly connected with the outer clamp (2) on the side away from the female seat (4), when the connecting seat (9) moves towards the side close to the female rod (5), the clamping force of the outer clamp (2) on the end face edge of the bearing inner ring (1b) also gradually increases.

9. The hydraulic fixture for metal part inspection as claimed in claim 7, wherein: The outer rod (8) and the outer side of the female rod (5) are fixedly connected with an oil inlet pipe (10), the oil cavity in the outer rod (8) and the hydraulic cavity in the female rod (5) are connected through the oil inlet pipe (10), when injecting oil through the oil injection valve (6), the outer clamp (2) and the inner clamp (3) can move synchronously, and the elastic deformation occurring locally can be effectively avoided during the whole clamping process; The tail parts of the female rod (5) and the outer rod (8) are both provided with exhaust holes (7) for ventilation, for compensating the gas space when the first piston (51) or the second piston (81) moves.

10. Hydraulic clamp for the detection of metal parts according to claim 1 or 2, characterized by the fact that: The female seat (4) is fixed through the fixing frame (14), at least one fixing frame (14) can move through the slide rail, for realizing the clamping and installation of the bearing (1).

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