A device for detecting circular arc symmetry of hydraulic pump blades

Abstract

The present invention belongs to the technical field of blade quality detection, and specifically is a device for detecting the circular arc symmetry of hydraulic pump blades; it comprises a detection platform, a conveyor is arranged on the outside of the detection platform, and the detection platform is located inside the conveyor belt of the conveyor; a first bracket is arranged on one side of the detection platform, and a first hydraulic cylinder is arranged on the side of the first bracket; the device for detecting the circular arc symmetry of hydraulic pump blades described in the present invention, when in use, the blade is fixed by a vacuum suction cup, and then moves on the inner arc surface of the blade through a guide rod, the guide rod drives the displacement sensor to move synchronously, the curvature of the blade is recorded, and the circular arc symmetry of the current blade can be quickly analyzed and calculated by a computer external to the displacement sensor; the entire detection process only requires the blade to be conveyed to the detection station on the detection platform through the conveyor; compared with detection through a dial indicator, the efficiency is higher and the detection process is simplified; it is suitable for detection operations of large quantities of blades.

Description

Technical Field

[0001] The invention belongs to the technical field of blade quality detection, in particular to a device for detecting circular arc symmetry of hydraulic pump blades. Background Art

[0002] The hydraulic pump is the power element of the hydraulic system. It is driven by an engine or an electric motor. It sucks oil from the hydraulic oil tank, forms pressurized oil and discharges it to the actuator. Hydraulic pumps are divided into gear pumps, plunger pumps, vane pumps and screw pumps according to their structure. The working principle of the vane pump is that the blades in the rotor groove are in contact with the pump casing, pressing the sucked liquid from the oil inlet side to the oil discharge side. The blades in the vane pump need to undergo multiple tests during the production process, among which the blade arc symmetry test is indispensable.

[0003] Blade arc symmetry refers to the degree of symmetry of the blade shape relative to a certain straight line (usually the axis of axial symmetry); in the fields of engineering and manufacturing, blade arc symmetry is one of the important indicators for evaluating blade quality, because it is directly related to the performance and reliability of the blade; currently, a dial indicator is required to detect arc symmetry; during the specific detection, the staff needs to constantly adjust the position of the blade to be detected, and the reading of the dial indicator needs to be recorded during the detection; after the detection, the reading needs to be calculated to finally obtain the symmetry; the detection process is cumbersome and inefficient.

[0004] To this end, the present invention provides a device for detecting the circular arc symmetry of hydraulic pump blades. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a device for detecting the circular arc symmetry of a hydraulic pump blade described in the present invention comprises a detection platform, a conveyor is arranged on the outside of the detection platform, and the detection platform is located inside the conveyor belt of the conveyor; a first bracket is arranged on one side of the detection platform, a first hydraulic cylinder is arranged on the side of the first bracket, a slide rail is arranged on the output end of the first hydraulic cylinder, a moving trolley is slidably connected inside the slide rail, a moving plate is arranged on the surface of the moving trolley, a slide groove is opened on the side of the moving plate, a slider is slidably connected inside the slide groove, and a displacement sensor is arranged on the side of the slider outside the slide groove; an elastic component is arranged between the slider and the inner wall of the slide groove; a guide rod extending out of the slide groove is arranged on the side of the slider;

[0007] A second bracket is arranged on the other side of the detection platform, a second hydraulic cylinder is arranged on the side of the second bracket, a receiving plate is arranged at the end of the output end of the second hydraulic cylinder, and vacuum suction cups are arranged at both ends of the receiving plate.

[0008] Preferably, the elastic component includes an air spring; the air spring is arranged in a slide groove, and one end is connected to the slider, and the other end is connected to the inner wall of the slide groove; a first conduit is provided on the side of the air spring; the first conduit is externally connected to an air pump; a second conduit is provided on the side of the air spring and located on one side of the first conduit, and the second conduit is provided on a side away from the air spring and is connected to a pressure relief valve installed on a movable plate.

[0009] Preferably, a roller is provided at one end of the guide rod away from the sliding block.

[0010] Preferably, the connecting plate includes a first connecting plate and a second connecting plate; the first connecting plate is provided with a pair of symmetrically arranged at both ends of the second connecting plate; a rotating column is rotatably connected between the first connecting plate and the second connecting plate, a first fixed plate is provided at the top end of the first connecting plate, a second fixed plate is provided at the top end of the second connecting plate, and a telescopic spring is provided between the first fixed plate and the second fixed plate; the vacuum suction cup is installed at the end of the first connecting plate.

[0011] Preferably, a pair of limit plates are symmetrically arranged on both sides of the supporting plate, and the width between the pair of limit plates is the same as the straight-line length of the two ends of the blade to be inspected; a connecting piece is arranged on the side of the limit plate; a third hydraulic cylinder is arranged at the bottom end of the connecting piece; the third hydraulic cylinder is installed on the side of the inspection platform, and the top end of the output end of the third hydraulic cylinder is connected to the connecting piece.

[0012] Preferably, the connecting member comprises a positioning plate, a connecting rod is provided through the side of the positioning plate, and one end of the connecting rod away from the positioning plate is fixedly connected to the side of the limiting plate; a buffer spring is provided between the limiting plate and the positioning plate.

[0013] Preferably, the bottom ends of the pair of limiting plates are provided with inclined portions away from each other.

[0014] Preferably, a pair of clamps are provided at the top of the conveyor, and a connecting frame is provided between the clamps; a support frame is provided between the connecting frame and the detection platform; the bottom end of the clamp is in contact with the conveyor belt surface of the conveyor without extrusion pressure; the distance between the pair of clamps is equal to the vertical distance of the horizontal section of the end of the blade to be detected at the center of the outer arc surface; a baffle is provided at the end of the clamp away from the feeding end; a fourth hydraulic cylinder is provided between the baffle and the support frame; the fourth hydraulic cylinder is installed on the side of the support frame, and the output end of the fourth hydraulic cylinder is connected to the end of the baffle.

[0015] Preferably, a notch is provided on the side of the clamping plate, a pair of rotating shafts are arranged inside the notch, a rotating belt is sleeved on the surface of the rotating shaft, and the rotating belt is made of rubber and is partially located in the area between the pair of clamping plates.

[0016] Preferably, a pair of the clamping plates are provided with guide plates which are away from each other at one end close to the feeding end of the conveyor.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention discloses a device for detecting circular arc symmetry of hydraulic pump blades. A displacement sensor is provided. When in use, the blade is fixed by a vacuum suction cup and then moves on the inner arc surface of the blade through a guide rod. The guide rod drives the displacement sensor to move synchronously. The displacement sensor records the movement trajectory of the slider. The slider moves synchronously with the guide rod, and the movement trajectory of the guide rod is recorded synchronously. The movement trajectory of the end of the guide rod can be equivalent to the curvature line of the inner arc surface of the blade, so the curvature of the blade is recorded. A computer connected to the displacement sensor can quickly analyze and calculate the circular arc symmetry of the current blade. Then, the detection of the circular arc symmetry of the blade is quickly completed. The entire detection process only requires the blade to be conveyed to the detection station on the detection table by a conveyor. Compared with the detection by a dial indicator, the detection efficiency is higher and the detection process is simplified. It is suitable for the detection of large quantities of blades.

[0019] 2. The present invention describes a device for detecting the circular arc symmetry of hydraulic pump blades, which is provided with clamps; during detection, it is necessary to continuously load materials at the loading end of the conveyor; specifically, the staff only needs to place the blade between a pair of clamps, and the distance between the pair of clamps is equal to the vertical distance of the horizontal section of the end of the blade to be detected at the center of the outer arc surface; therefore, when the blade is driven between the clamps, it can be on the loading route where the detection station is located; when the blade moves to the end of the clamp, it is blocked by the baffle; when detection is required, the baffle is driven by the fourth hydraulic cylinder to release the obstruction of the blade; then the conveyor is controlled to drive the blade to the designated detection station, and the conveying distance of the conveyor is pre-set; ensuring that the blade moves stably to the detection station; which is conducive to improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a stereogram of the present invention;

[0022] Figure 2 It is a schematic diagram of the connection structure of the movable plate of the present invention;

[0023] Figure 3 It is a side schematic diagram of the movable plate connection structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the internal structure of the movable plate of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection structure of the docking plate of the present invention;

[0026] Figure 6It is a schematic diagram of a receiving plate of the present invention;

[0027] Figure 7 It is a schematic diagram of the exploded view of the receiving plate of the present invention;

[0028] Figure 8 is a schematic diagram of a connector of the present invention;

[0029] Fig. 9 It is a schematic diagram of the splint connection structure of the present invention;

[0030] Fig.10 It is a side schematic diagram of the splint of the present invention;

[0031] Fig.11 It is a side schematic diagram of the rotating belt connection structure of the present invention.

[0032] In the figure: 1. test bench; 11. first bracket; 12. first hydraulic cylinder; 13. slide rail; 14. mobile trolley; 15. mobile plate; 16. slide chute; 161. slider; 17. displacement sensor; 18. guide rod; 19. roller; 2. conveyor; 20. air spring; 21. first conduit; 22. second conduit; 23. pressure relief valve; 3. second bracket; 31. second hydraulic cylinder; 32. receiving plate; 321. first connecting plate; 322. second connecting plate; 33. vacuum suction cup; 34. second fixed plate; 35. telescopic spring; 36. first fixed plate; 37. rotating column; 4. limit plate; 41. connecting rod; 42. buffer spring; 43. positioning plate; 44. third hydraulic cylinder; 5. clamping plate; 51. support frame; 52. fourth hydraulic cylinder; 53. baffle; 54. rotating belt; 55. rotating shaft; 56. guide plate. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] like Figures 1 to 5 As shown, a device for detecting the circular arc symmetry of a hydraulic pump blade according to an embodiment of the present invention comprises a detection platform 1, a conveyor 2 is arranged outside the detection platform 1, and the detection platform 1 is located inside the conveyor belt of the conveyor 2; a first bracket 11 is arranged on one side of the detection platform 1, a first hydraulic cylinder 12 is arranged on the side of the first bracket 11, a slide rail 13 is arranged on the output end of the first hydraulic cylinder 12, a moving trolley 14 is slidably connected inside the slide rail 13, a moving plate 15 is arranged on the surface of the moving trolley 14, a slide groove 16 is opened on the side of the moving plate 15, a slider 161 is slidably connected inside the slide groove 16, and a displacement sensor 17 is arranged on the side of the slider 161 outside the slide groove 16; an elastic component is arranged between the slider 161 and the inner wall of the slide groove 16; a guide rod 18 extending out of the slide groove 16 is arranged on the side of the slider 161;

[0035] A second bracket 3 is provided on the other side of the testing platform 1, a second hydraulic cylinder 31 is provided on the side of the second bracket 3, a receiving plate 32 is provided at the end of the output end of the second hydraulic cylinder 31, and vacuum suction cups 33 are provided at both ends of the receiving plate 32;

[0036] At present, when detecting the circular arc symmetry of the blade, it is necessary to use a dial indicator for detection; during the specific detection, the staff needs to constantly adjust the position of the blade to be detected, and the reading of the dial indicator needs to be recorded during the detection; after the detection, the reading needs to be calculated to finally obtain the symmetry; the detection process is cumbersome and inefficient; in order to solve the above problems, the embodiment of the present invention is provided with a vacuum suction cup 33, a displacement sensor 17 and other structures; the specific working process is as follows; when detecting the circular arc symmetry of the blade, the blade is conveyed to the top of the detection table 1 by the conveyor 2, and then the second hydraulic cylinder 31 is started, The output end of the second hydraulic cylinder 31 drives the receiving plate 32 to move toward the position of the blade to be detected, and stops when the openings of the vacuum suction cups 33 at both ends of the receiving plate 32 are pressed and blocked by the side surfaces of the blade, and then the blade is adsorbed and fixed by the vacuum suction cups 33; then the first hydraulic cylinder 12 is started, and the first hydraulic cylinder 12 drives the slide rail 13 to move toward the fixed blade position, and the slide rail 13 drives the moving plate 15 to move synchronously through the moving trolley 14, and the moving plate 15 drives the guide rod 18 to move, and stops when the end of the guide rod 18 is pressed and contacted with the inner arc surface of the blade. At this time, the guide rod 18 is moved by the slide The block 161 squeezes the elastic component, and then the moving trolley 14 is started, and the moving plate 15 is driven to move by the moving trolley 14, and the moving plate 15 drives the guide rod 18 to move synchronously. When the end of the guide rod 18 moves on the inner arc surface of the blade, the elastic force of the elastic component makes the end of the guide rod 18 always adhere to the inner arc surface of the blade. When the guide rod 18 moves to cover both ends of the inner arc surface of the blade, it stops. In this process, the slider 161 drives the displacement sensor 17 to move synchronously, and the displacement sensor 17 records the movement trajectory of the slider 161, and the slider 161 It moves synchronously with the guide rod 18, and the movement trajectory of the guide rod 18 is recorded synchronously; the movement trajectory of the end of the guide rod 18 can be equivalent to the curvature line of the inner arc surface of the blade, so the curvature of the blade is recorded, and the computer connected to the displacement sensor 17 can quickly analyze and calculate the arc symmetry of the current blade; and then quickly complete the detection of the arc symmetry of the blade; the entire detection process only needs to convey the blade to the detection station on the detection table 1 through the conveyor 2; compared with the detection through the dial indicator, it is more efficient and the detection process is simplified; it is suitable for the detection of large quantities of blades.

[0037] The elastic component includes an air spring 20; the air spring 20 is arranged in the slide groove 16, and one end is connected to the slider 161, and the other end is connected to the inner wall of the slide groove 16; a first conduit 21 is connected to the side of the air spring 20; the first conduit 21 is externally connected to an air pump; a second conduit 22 is connected to the side of the air spring 20 and located on one side of the first conduit 21, and a pressure relief valve 23 installed on the movable plate 15 is connected to the side of the second conduit 22 away from the air spring 20; during detection, the air pump externally connected to the first conduit 21 is started to continuously inflate the air spring 20, and then the air is exhausted through the second conduit 22 and the pressure relief valve 23, and the pressure relief valve 23 regulates the internal pressure of the air spring 20 to stabilize the internal pressure of the air spring 20; thereby, the pressing force of the end of the guide rod 18 on the surface of the blade to be detected is constant, thereby protecting the blade and reducing the probability of the blade being scratched by the guide rod 18.

[0038] A roller 19 is provided at one end of the guide rod 18 away from the slider 161; the roller 19 can contact the blade instead of the end of the guide rod 18, and then the roller 19 rolls on the blade when the guide rod 18 moves, further reducing the probability of scratches during blade detection.

[0039] like Figures 5 to 7 As shown, the receiving plate 32 includes a first connecting plate 321 and a second connecting plate 322; the first connecting plate 321 is provided with a pair of and symmetrically arranged at both ends of the second connecting plate 322; a rotating column 37 is rotatably connected between the first connecting plate 321 and the second connecting plate 322, a first fixing plate 36 is provided at the top of the first connecting plate 321, and a second fixing plate 34 is provided at the top of the second connecting plate 322, and a telescopic spring 35 is provided between the first fixing plate 36 and the second fixing plate 34; the vacuum suction cup 33 is installed at the end of the first connecting plate 321; when the receiving plate 32 drives the vacuum suction cup 33 to press against the side of the blade to be detected, the first connecting plate 321 can be rotated relative to the second connecting plate 322 through the rotating column 37, and the first fixing plate 36 and the second fixing plate 34 cooperate with the telescopic spring 35 to stabilize the rotation angle; so that the vacuum suction cup 33 is facing the curved surface of the blade; then the vacuum suction cup 33 is started for adsorption; to ensure the adsorption effect.

[0040] like Figures 1 to 9As shown, a pair of limit plates 4 are symmetrically arranged on both sides of the receiving plate 32, and the width between the pair of limit plates 4 is the same as the straight-line length of the two ends of the blade to be detected; a connecting piece is arranged on the side of the limit plate 4; a third hydraulic cylinder 44 is arranged at the bottom end of the connecting piece; the third hydraulic cylinder 44 is installed on the side of the detection platform 1, and the top of the output end of the third hydraulic cylinder 44 is connected to the connecting piece; when the blade to be detected moves to the detection station, the third hydraulic cylinder 44 is started, and the third hydraulic cylinder 44 drives the limit plate 4 to move downward through the connecting piece, and the width between the pair of limit plates 4 is the same as the straight-line length of the two ends of the blade to be detected, so the pair of limit plates 4 clamps and fixes the blade to be detected, which is convenient for the subsequent pressure and adsorption of the vacuum suction cup 33.

[0041] The connecting part includes a positioning plate 43, a connecting rod 41 is provided on the side of the positioning plate 43, and the end of the connecting rod 41 away from the positioning plate 43 is fixedly connected to the side of the limiting plate 4; a buffer spring 42 is provided between the limiting plate 4 and the positioning plate 43; the bottom ends of a pair of limiting plates 4 are provided with inclined parts away from each other; for blades of different sizes, when the limiting plate 4 moves downward, the inclined part at the bottom end of the limiting plate 4 is pushed by the end of the blade, compressing the buffer spring 42, and limiting the movement in the horizontal direction through the connecting rod 41 and the positioning plate 43. When the limiting plate 4 stops moving, the horizontal part of the limiting plate 4 limits and fixes the blade to be detected, thereby improving the applicable range of the detection size.

[0042] like Figures 9 to 11 As shown, a pair of clamping plates 5 are arranged at the top of the conveyor 2, and a connecting frame is arranged between the clamping plates 5; a supporting frame 51 is arranged between the connecting frame and the testing platform 1; the bottom end of the clamping plate 5 is in contact with the conveyor belt surface of the conveyor 2 without extrusion force; the distance between the pair of clamping plates 5 is equal to the vertical distance of the horizontal section of the end of the blade to be tested at the center of the outer arc surface; a baffle 53 is arranged at the end of the clamping plate 5 away from the feeding end; a fourth hydraulic cylinder 52 is arranged between the baffle 53 and the supporting frame 51; the fourth hydraulic cylinder 52 is installed on the side of the supporting frame 51, and the output end of the fourth hydraulic cylinder 52 is connected to the end of the baffle 53; during the inspection, it is necessary to continuously load the material at the feeding end of the conveyor 2; specifically, the staff only needs to put the blade The blade is placed between a pair of clamps 5, and the distance between the pair of clamps 5 is equal to the vertical distance of the horizontal section of the end of the blade to be detected at the center of the outer arc surface; therefore, when the blade is driven between the clamps 5, it can be on the loading route where the detection station is located; when the blade moves to the end of the clamp 5, it is blocked by the baffle 53; when detection is required, the baffle 53 is driven by the fourth hydraulic cylinder 52 to release the obstruction of the blade; then the conveyor 2 is controlled to drive the blade to the designated detection station, and the conveying distance of the conveyor 2 is pre-set; ensure that the blade moves stably to the detection station; which is conducive to improving the detection accuracy; it should be pointed out that after the blade moves out of between the clamps 5, the baffle 53 will be driven to block the next blade again,

[0043] A notch is provided on the side of the splint 5, and a pair of rotating shafts 55 are arranged inside the notch. A rotating belt 54 is sleeved on the surface of the rotating shaft 55. The rotating belt 54 is made of rubber and is partially located in the area between the pair of splints 5. When the blade moves between the pair of splints 5, the rotating belt 54 is driven to rotate by friction, and the staff adjusts the distance between the pair of splints 5 so that there is friction between the blade and the rotating belt 54, and there is no contact between the splints 5. This can reduce the friction of the splint 5 on the blade when it moves, thereby protecting the blade.

[0044] A pair of clamping plates 5 are provided with receiving plates 56 which are far away from each other at one end close to the feeding end of the conveyor 2; during feeding, the pair of receiving plates 56 can receive and guide the blades to avoid being blocked by the end of the clamping plates 5 during feeding, thereby optimizing the feeding process.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic pump blade arc symmetry detection device, characterized in that: The invention comprises a detection platform (1), wherein a conveyor (2) is arranged outside the detection platform (1), and the detection platform (1) is located inside the conveyor belt of the conveyor (2); a first bracket (11) is arranged on one side of the detection platform (1), a first hydraulic cylinder (12) is arranged on the side of the first bracket (11), a slide rail (13) is arranged on the output end of the first hydraulic cylinder (12), a moving trolley (14) is slidably connected inside the slide rail (13), a moving plate (15) is arranged on the surface of the moving trolley (14), a slide groove (16) is opened on the side of the moving plate (15), a slider (161) is slidably connected inside the slide groove (16), and a displacement sensor (17) is arranged on the side of the slider (161) located outside the slide groove (16); an elastic component is arranged between the slider (161) and the inner wall of the slide groove (16); a guide rod (18) extending out of the slide groove (16) is arranged on the side of the slider (161); A second bracket (3) is provided on the other side of the detection platform (1), a second hydraulic cylinder (31) is provided on the side of the second bracket (3), a receiving plate (32) is provided at the end of the output end of the second hydraulic cylinder (31), and vacuum suction cups (33) are provided at both ends of the receiving plate (32); A pair of limit plates (4) are symmetrically arranged on both sides of the receiving plate (32), and the width between the pair of limit plates (4) is the same as the straight line length of the two ends of the blade to be tested; a connecting piece is arranged on the side of the limit plate (4); a third hydraulic cylinder (44) is arranged at the bottom end of the connecting piece; the third hydraulic cylinder (44) is installed on the side of the testing platform (1), and the top end of the output end of the third hydraulic cylinder (44) is connected to the connecting piece; The connecting member comprises a positioning plate (43), a connecting rod (41) is provided through the side of the positioning plate (43), and one end of the connecting rod (41) away from the positioning plate (43) is fixedly connected to the side of the limiting plate (4); a buffer spring (42) is provided between the limiting plate (4) and the positioning plate (43); The bottom ends of the pair of limit plates (4) are provided with inclined portions which are away from each other.

2. A hydraulic pump blade arc symmetry detection device according to claim 1, characterized in that: The elastic component comprises an air spring (20); the air spring (20) is arranged in a slide groove (16), and one end of the air spring (20) is connected to a slider (161), and the other end is connected to an inner wall of the slide groove (16); a first conduit (21) is arranged on a side of the air spring (20); an air pump is externally connected to the first conduit (21); a second conduit (22) is arranged on a side of the air spring (20) and located on a side of the first conduit (21); a pressure relief valve (23) mounted on a movable plate (15) is arranged on a side of the air spring (20) and located on a side of the first conduit (21); and a pressure relief valve (23) mounted on a movable plate (15) is arranged on a side of the second conduit (22) away from the air spring (20).

3. The device for detecting circular arc symmetry of hydraulic pump blades according to claim 1, characterized in that: A roller (19) is provided at one end of the guide rod (18) away from the slider (161).

4. The device for detecting circular arc symmetry of hydraulic pump blades according to claim 1, characterized in that: The receiving plate (32) comprises a first connecting plate (321) and a second connecting plate (322); the first connecting plate (321) is provided with a pair of connecting plates symmetrically arranged at two ends of the second connecting plate (322); a rotating column (37) is rotatably connected between the first connecting plate (321) and the second connecting plate (322); a first fixing plate (36) is provided at the top end of the first connecting plate (321); a second fixing plate (34) is provided at the top end of the second connecting plate (322); and a telescopic spring (35) is provided between the first fixing plate (36) and the second fixing plate (34); the vacuum suction cup (33) is mounted at the end of the first connecting plate (321).

5. The device for detecting circular arc symmetry of hydraulic pump blades according to claim 1, characterized in that: A pair of clamping plates (5) are arranged at the top end of the conveyor (2), and a connecting frame is arranged between the clamping plates (5); a supporting frame (51) is arranged between the connecting frame and the detection platform (1); the bottom end of the clamping plate (5) is in contact with the conveyor belt surface of the conveyor (2) without extrusion force; the distance between the pair of clamping plates (5) is equal to the vertical distance of the horizontal section of the end of the blade to be detected at the center of the outer arc surface; a baffle (53) is arranged at one end of the clamping plate (5) away from the feeding end; a fourth hydraulic cylinder (52) is arranged between the baffle (53) and the supporting frame (51); the fourth hydraulic cylinder (52) is installed on the side of the supporting frame (51), and the output end of the fourth hydraulic cylinder (52) is connected to the end of the baffle (53).

6. A hydraulic pump blade arc symmetry detection device according to claim 5, characterized in that: A notch is provided on the side of the clamping plate (5), a pair of rotating shafts (55) are arranged inside the notch, a rotating belt (54) is sleeved on the surface of the rotating shaft (55), and the rotating belt (54) is made of rubber and is partially located in the area between the pair of clamping plates (5).

7. A hydraulic pump blade arc symmetry detection device according to claim 6, characterized in that: A pair of clamping plates (5) are provided with guide plates (56) spaced apart from each other at one end of the pair of clamping plates (5) close to the feeding end of the conveyor (2).

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