CN111398423A - An ultrasonic nondestructive testing device for shaft parts - Google Patents

Abstract

The invention provides an ultrasonic non-destructive testing device for shaft parts, which includes a testing workbench and a controller. The detection workbench is provided with a coupling water tank and a cantilever beam unit. rollers, both ends of each roller are penetrated on the wall of the coupling water tank through bearings and sealing sleeves, a synchronous belt is connected between the rollers, and the rollers are driven by a gear motor arranged outside the coupling water tank to rotate in the axial direction; The cantilever beam unit includes a beam arranged above the water tank and parallel to the active roller, the beam is provided with a probe lift seat that can move horizontally, the probe lift seat is provided with a probe frame that can move up and down, and the probe frame is provided with a number of ultrasonic probes . The flaw detection device has a simple structure and convenient operation, low requirements on the surface smoothness of the parts to be detected, and the probe is not easy to wear.

Description

An ultrasonic nondestructive testing device for shaft parts

technical field

The invention belongs to the technical field of nondestructive testing equipment, and particularly relates to an ultrasonic nondestructive testing device for shaft parts.

Background technique

When shaft components are applied to equipment and workpieces, they usually need to bear a large load, torque, etc. If they have processing defects such as cracks and internal shrinkage holes, they are prone to deformation or shaft breakage during use, resulting in equipment failure. damage or lead to safety accidents, therefore, most of the shaft parts require non-destructive testing in the process of processing. At present, the more commonly used detection method is ultrasonic testing, which uses the difference in the acoustic properties of materials and their defects to detect the ultrasonic wave propagation waveform and the energy changes during reflection and penetration to detect the internal defects of materials. The traditional ultrasonic nondestructive testing method usually uses hand-held flaw detection equipment to manually select and scan the parts to be tested. The detection efficiency is low and the labor cost is high, especially for some parts with a large number of batches. It is difficult to meet the needs of efficient production operations by using manual hand-held equipment for inspection and flaw detection.

At present, some automated testing equipment has also appeared in the field of non-destructive testing of shaft parts, but there are shortcomings such as complex structure, inconvenient operation, and high requirements for the surface processing accuracy of the parts to be tested. For example, a radial automatic flaw detection device for an axle with the publication number of CN103217477, the axle to be inspected is rotated by the pneumatic top support at both ends, and it is required to ensure the coaxiality between the axle and the pneumatic top, and the operation requirements are high, which makes the equipment structure more complicated. When performing inspection operations, the probe needs to be close to the surface of the axle, which requires a high degree of smoothness on the surface of the axle, and the probe is easy to wear. The publication number is CN101614703B, an automatic ultrasonic flaw detection device for rail transit axles. The structure of the underwater supporting rotating mechanism is complex, which is easy to affect the smoothness of the flaw detection signal. Multiple sets of probes are controlled by servo motors to maintain the distance from the axle surface, and the system linkage is complex. , more prone to failure, and higher cost.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides an ultrasonic non-destructive testing device for shaft parts. Compared with the existing shaft parts flaw detection and detection device, the supporting and rotating mechanism structure is simpler, the flaw detection operation is simpler, and it has better performance. Flaw detection effect. For realizing the above-mentioned technical purpose, the technical scheme that the present invention takes is as follows:

An ultrasonic nondestructive testing device for shaft parts, including a testing table and a controller, a coupling water tank and a cantilever beam unit are arranged on the testing table; a pair of rollers parallel to each other and having the same diameter are arranged in the coupling water tank along the horizontal direction , the rollers are all worn on the box wall of the coupling water tank, and a bearing and a sealing sleeve are provided at the connection between the roller and the box wall; a timing belt is connected between the rollers at a position outside the coupling water tank; so The roller includes a driving roller and a driven roller, wherein the driving roller is driven to rotate in the axial direction by a deceleration motor arranged on the detection table, and drives the driven roller to rotate in the same direction and at the same speed through the synchronous belt; A beam is arranged on the cantilever beam unit, and the beam is located above the coupling water tank and is parallel to the roller; a linear guide rail is arranged on the beam along the length direction, and a probe lifting seat is movable along the linear guide rail. The movable probe frame is provided with several ultrasonic probes facing downward along the direction parallel to the axis of the roller; the geared motor, the probe lifting seat and the ultrasonic probe are all connected with the controller circuit.

Preferably, the sealing sleeve and the bearing are both sleeved on the roller, and the inner wall and the outer wall of each connection between the wall of the coupling water tank and the roller are connected with sealing sleeves; An annular groove of the shaft, a sealing ring is embedded in the groove, and the sealing ring is sleeved on the roller and pressed into the annular groove by the roller; a bearing sleeve is provided outside the bearing, and the bearing sleeve is is connected to the sealing sleeve, the roller is also sleeved with a pressing piece, and the pressing piece is connected to the bearing sleeve.

Further, sealing gaskets are arranged between the sealing sleeve and the wall of the coupling water tank, between the bearing sleeve and the sealing sleeve, and between the pressing plate and the bearing sleeve.

Preferably, each roller includes a connecting section at both ends and a detecting piece supporting section at the middle section, the connecting section is connected to the wall of the coupled water tank through a bearing and a sealing sleeve, and the connecting section and the detecting piece supporting section are coaxially assembled and connected .

Further, a pair of limit wheels whose positions can be adjusted in the axial direction are respectively sleeved on the detection piece supporting section of each roller, and the opposite surfaces of each pair of limit wheels are vertical planes.

Further, a plurality of friction wheels are respectively sleeved on the corresponding positions of the detecting member bearing sections of each roller, and the position of the friction wheels is adjustable along the axial direction of the roller.

Preferably, a screw rod parallel to the linear guide rail is arranged on the beam, and a slider that can slide along the linear guide rail and a transmission block matched with the screw rod are arranged on the probe lifting seat; the screw rod is arranged on the The servo motor on the beam is driven to rotate in the axial direction, and when the lead screw rotates, the probe lifting seat is driven to move horizontally along the linear guide rail through the transmission block; the servo motor is connected with the controller circuit.

Preferably, a vertical downward cylinder is arranged on the probe lifting seat, a C-type splint is connected to the lower end of the cylinder, the C-type splint is driven by the cylinder to move up and down, and the probe frame is mounted on the C-type splint; the cylinder is connected to the C-type splint. Controller circuit connections.

Further, a cylinder mounting frame with adjustable vertical position is provided on the probe lifting base, and the cylinder is arranged on the cylinder mounting frame.

Further, the probe frame is provided with a pair of clamping blocks, and the clamping blocks are provided with clamping grooves matching the C-type splint in relative positions, and the C-type clamping plate is inserted into the clamping grooves.

Compared with the prior art, the beneficial effects of the present invention are:

(1) Using the ultrasonic water immersion method as the flaw detection method, the ultrasonic probe does not need to be in direct contact with the shaft to be tested, which effectively reduces the wear of the probe. Early detection of problems can avoid subsequent ineffective processing of faulty shaft parts and improve the production process.

(2) The structure of the supporting and rotating mechanism of the shaft to be detected is simple, and the driving and transmission parts of the roller are set outside the coupling water tank, which reduces the influence on the smoothness of the ultrasonic detection signal and effectively solves the problem that the transmission parts are easily damaged in liquid. Rust and difficult maintenance problems.

(3) Multiple probes detect at the same time, which effectively improves the flaw detection efficiency. The integrated module design of the probe and the probe frame can select the appropriate probe frame to quickly disassemble and replace according to the specifications of the shaft to be tested and the testing requirements, especially For the detection of surface camshaft parts, a better solution is provided, the overall structure is simple, the operation is convenient, and the system linkage is less, which can effectively reduce the failure rate of the equipment.

(4) It has a high degree of automation, which reduces the work intensity of the operator and the misjudgment of the test results. The internal and surface defects of the shaft parts can be automatically detected by setting different combinations of probe holders and operation control software. Detection and identification, through the linkage of industrial robots can be matched in the industrial assembly line.

Description of drawings

Fig. 1: the three-dimensional structure schematic diagram of the present invention;

Fig. 2: the top view structure schematic diagram of the present invention;

Fig. 3: the side view sectional structure schematic diagram of the present invention;

Figure 4: a schematic cross-sectional structure diagram of the connection between the wall of the coupled water tank and the roller in the present invention;

Figure 5: Schematic diagram of the disassembly of the bearing and the sealing sleeve in the present invention;

Fig. 6: The installation structure schematic diagram of the limit wheel and friction wheel of the present invention;

FIG. 7 is a schematic diagram of the partial structure of the probe holder of the present invention.

In each figure: 1. Inspection table; 2. Coupling water tank; 3. Cantilever beam unit; 4. Controller;

21. Roller; 22. Bearing; 23. Sealing sleeve; 24. Geared motor; 25. Timing belt; 26. Limit wheel; 27. Friction wheel; 221. Bearing sleeve; groove; 232. sealing ring;

31. Beam; 32. Probe lifting seat; 311. Linear guide rail; 312. Screw rod; 313. Servo motor; 321. Slider; 322. Transmission block; 323. Cylinder; 326. Ultrasonic probe; 327. Cylinder mounting bracket; 328. Clamping block.

Detailed ways

For a better understanding of the present invention, a clearer and more complete description is given below with reference to the accompanying drawings and specific embodiments. The listed embodiments are preferred forms of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to The scope of protection of the present invention.

An ultrasonic non-destructive testing device for shaft parts, as shown in FIG. 1 to FIG. 3, includes a detection workbench 1 and a controller 4. The detection workbench 1 is provided with a coupling water tank 2 and a cantilever beam unit 3. 2. A pair of rollers 21 that are parallel to each other and have the same diameter are arranged in the horizontal direction. The rollers 21 are all worn on the box wall of the coupling water tank 2. The connection between the rollers 21 and the box wall is provided with a bearing 22 and a seal Sleeve 23, a synchronous belt 25 is connected between each roller 21 at a position outside the coupling water tank 2, in a specific embodiment, the synchronous belt 25 is sleeved on the same end of the two rollers 21 The roller 21 includes a driving roller and a driven roller, and the driving roller is driven to rotate in the axial direction by the deceleration motor 24 arranged on the detection table 1, and drives the driven roller through the synchronous belt 25. The shafts rotate in the same direction and at the same speed; the cantilever beam unit 3 is provided with a beam 31, the beam 31 is located above the coupling water tank 2 and is parallel to the roller 21, and a linear guide rail 311 is arranged on the beam 31 along the length direction, along the straight line The guide rail 311 is movably provided with a probe lifting seat 32, the probe lifting seat 32 is provided with a probe frame 325 that can move up and down, and the probe frame 325 is provided with a number of ultrasonic probes 326 facing downward along the direction parallel to the axis of the roller 21; deceleration; The motor 24 , the probe lifting base 32 and the ultrasonic probe 326 are all connected to the controller 4 in an electrical circuit. In practical applications, the controller 4 is an industrial computer commonly used in the industry, which can have a built-in multi-channel ultrasonic processing unit, an electrical control unit and a human-computer interaction unit. The preset control program controls the operation of the ultrasonic probe 326 and each transmission component, and the controller 4 may be arranged on the inspection workbench 1, or may be an operation control platform independently arranged. In a specific application, the number and distribution of the ultrasonic probes 326 on the probe frame 325 can be selected and set according to the specifications of the shaft to be inspected, and can also be inspected according to different inspection requirements, such as surface or internal defects. Set the ultrasonic processing unit in the controller 4. In addition, a robotic arm can also be set up next to the inspection workbench 1, and controlled by the controller 4 to complete the clamping, placement and sorting of the shaft to be inspected, so as to realize the automatic operation of the whole process of inspection.

When the device performs the inspection and detection operation, the coupling medium such as water or oil is added into the coupling water tank 2, and the shaft to be detected is placed horizontally between the two rollers 21, and the whole is immersed in the coupling medium. When the roller 21 rotates, it drives the waiting The detection shaft rotates synchronously; the probe lifting seat 32 moves to one end of the shaft to be detected, and the probe frame 325 moves downward at the same time. When the ultrasonic probe 326 and the surface of the shaft to be detected reach an effective working distance, the flaw detection begins, and the completion of the inspection is completed. After the detection, the probe lifting seat 32 moves to the other end of the shaft to be detected. After moving a certain distance, the next section is detected. After the entire shaft is detected, the shaft to be detected is replaced, and the probe lifting seat 32 returns to the initial end. Proceed to the next shaft inspection. The horizontal movement of the probe lift seat 32 and the up and down movement of the probe frame 325 can be manually controlled by the operator through the controller 4, or can be automatically controlled by a preset program according to the size and specification of the shaft. Compared with the prior art, the device uses coupling fluid as the transmission medium of ultrasonic waves, and the ultrasonic probe does not need to be in direct contact with the shaft to be detected, which effectively reduces the wear of the probe, and has lower requirements on the surface smoothness of the shaft to be detected. , it can be detected before finishing, and problems can be found early, so as to avoid subsequent invalid processing of the faulty shaft; secondly, the supporting and rotating mechanism of the shaft to be detected is simple in structure, and the driving and transmission parts of the roller 21 are arranged in the coupling In addition to the water tank 2, the influence on the smoothness of the ultrasonic detection signal is reduced, and the problem that the transmission parts are easily corroded in the liquid is effectively solved; the third is the simultaneous detection of multiple probes, which effectively improves the flaw detection efficiency. 325 integrated module design, according to the specifications of the shaft to be tested, select the appropriate probe frame 325 rapid disassembly and replacement, the overall structure is simple, easy to operate, less system linkage, which can effectively reduce the failure rate of the equipment.

In this invention, the roller 21 is used to support and rotate the shaft to be detected inside the coupling tank 2, and the driving and transmission components of the roller 21 are arranged outside the coupling tank 2. Therefore, the roller 21 passes through the coupling tank 2. On the tank wall of the water tank 2, in order to ensure the smooth rotation of the roller 21 and prevent the coupling fluid in the coupling tank 2 from leaking, a bearing 22 and a sealing sleeve 23 are provided at the connection between the roller 21 and the wall of the coupling tank 2. In a preferred embodiment, as shown in FIGS. 4 to 5 , the sealing sleeve 23 and the bearing 22 are both sleeved on the roller 21 . A sealing sleeve 23 is connected to the inner wall and the outer wall. The inner cavity wall of the sealing sleeve 23 is provided with a plurality of annular grooves 231 surrounding the roller 21. The annular groove 231 is embedded with a sealing ring 232, and the sealing ring 232 is sleeved on the roller. 21, and is pressed in the annular groove 231 by the roller 21. A bearing sleeve 221 is provided outside the bearing 22 , the bearing sleeve 221 is connected to the sealing sleeve 23 , and a pressing plate 222 is also sleeved on the roller 21 , and the pressing plate 222 is connected to the bearing sleeve 221 . In a specific application, the sealing ring 232 is made of elastic rubber material. In order to further improve the sealing effect, a spring can be wrapped inside the rubber, so that the sealing ring 232 can be tightly hooped on the rolling On the shaft 21 , it has been verified by experiments that the sealing ring 232 can effectively prevent the coupling fluid from leaking out from the connection between the roller 21 and the sealing sleeve 23 . Since the rotation speed of the roller 21 is relatively slow in actual use, the sealing ring 232 will not affect the rotation of the roller 21 . In addition, in a specific application, between the sealing sleeve 23 and the wall of the coupling tank 2, between the bearing sleeve 221 and the sealing sleeve 23, and between the pressure plate 222 and the bearing sleeve 223, all are fixedly connected by bolts. The connection part can be provided with a sealing gasket made of rubber material to further improve the overall sealing performance of the connection part. In a specific embodiment, the roller 21 is sleeved near the outer end pressing sheet 222 in a stepped shape with a slightly smaller diameter at the end, and the pressing sheets 222 sleeved on both ends of the roller 21 are connected to each other. When the bearing sleeve 221 is placed on the bearing sleeve 221 and pressed on the steps at the same time, the relative action of the pressing sheets 222 at both ends on the roller 21 can effectively limit the axial displacement of the roller 21 .

In a preferred embodiment, the roller 21 is composed of three sections, including a connecting section at both ends and a detecting piece supporting section at the middle section, and the connecting section is connected to the box of the coupling water tank 2 through the bearing 22 and the sealing sleeve 23 On the wall, the connecting section and the detecting piece supporting section are coaxially assembled and connected. The effect is that when the rollers 21 need to be replaced for the detection of shafts of different specifications, only the supporting section of the detection part in the middle section needs to be replaced, and there is no need to reassemble the connection between the rollers 21 and the wall of the coupling tank 2. , improve work efficiency. In a specific application, as shown in FIG. 6 , the connection parts of the connection section and the detection piece supporting section are engaged with each other and fastened by bolts.

During the inspection operation, the shaft to be inspected is placed between the two rollers 21 and driven to rotate synchronously by the rollers 21 . When the shaft to be inspected rotates, displacement in the axial direction may occur. In a preferred embodiment, as shown in FIG. 6 , a pair of limit wheels 26 whose positions are adjustable in the axial direction are respectively sleeved at the positions corresponding to the detecting member bearing sections of the two rollers 21 . The opposite surface of the bit wheel 26 is a vertical plane. The function of setting the limit wheel 26 is to limit the position of the shaft to be detected between each pair of limit wheels 26 to avoid axial displacement, thereby improving the stability of the detection operation. The limit wheel 26 is along the axial direction of the roller 21 The position is adjustable to meet the limit requirements of shafts of different lengths. In a specific embodiment, the limiting wheel 26 is provided with a clamp ring sleeved on the roller 21, and the clamp ring is provided with a screw hole. By screwing a nut into the screw hole and pressing it on the On the roller 21, the limit wheel 26 is positioned, and the axial position can be adjusted by loosening the nut and moving the limit wheel 26 during adjustment. In addition, the axial position of the limiting wheel 26 can also be adjusted by arranging an elastic clamping ring or a clamping block on the limiting wheel 26 . According to actual operating experience, when the rotation direction of the roller 21 remains unchanged, if the shaft on the roller 21 is displaced axially, it will move in the same direction, and the limit wheel 26 on one side can play the role of Therefore, the distance between the two limit wheels 26 can be adjusted to be greater than the length of the shaft member, and there is no need to closely match the length of the shaft member, and there will be no excessive clearance between the two ends of the shaft member and the limit wheels 26. The problem of inconvenient insertion of the shaft is small, and the problem that the rotation of the shaft is affected by being clamped by the limiting wheel 26 will not occur.

In a preferred embodiment, as shown in FIG. 6 , a number of friction wheels 27 are sleeved at the positions corresponding to the bearing sections of the detection pieces of each roller 21 . The friction between the shaft parts is detected to avoid slippage during rotation. In a specific application, the surface of the friction wheel 27 can be made of materials with high friction coefficients such as rubber and nylon. In order to adapt to shafts of different sizes and specifications, in a preferred embodiment, the position of the friction wheel 27 along the axial direction of the roller 21 can be adjusted. 26 is adjusted in the same way.

In the detection device provided by the present invention, the probe lifting seat 32 moves horizontally along the linear guide rail 311, and its purpose is to drive the probe frame 325 to move above the shaft to be detected, so as to complete the detection of the entire shaft. In a preferred embodiment, the beam 31 is provided with a screw rod 312 parallel to the linear guide rail 311 , and the probe lifting seat 32 is provided with a slider 321 that slides along the linear guide rail 311 and is connected with the screw rod 312 The transmission block 322 is driven by the screw rod 312 to rotate in the axial direction by the servo motor 313 provided on the beam 31. When the screw rod 312 rotates, the probe lifting seat 32 is driven to move horizontally along the linear guide rail 311 by the transmission block 322. The servo motor 313 is electrically connected to the controller 4 . The probe lifting base 32 is driven to move horizontally by the transmission of the screw rod 312, the structure is simpler, and the control is easy. In addition, the movement of the probe lifting base 32 in the horizontal direction can also be driven by other means such as electric sliding table, belt or chain transmission.

In the detection device provided by the present invention, the probe lift seat 32 is provided with a probe frame 325 that can move up and down, the purpose of which is to move the ultrasonic probe 326 on the probe frame 325 close to the surface of the shaft to be detected, so as to achieve an effective detection distance . In a preferred embodiment, the probe lifting base 32 is provided with a vertically downward cylinder 323, and the top end of the piston of the cylinder 323 is connected with a C-type splint 324, the C-type splint 324 is driven by the cylinder 323 to move up and down, the The probe holder 325 is mounted on the C-type splint 324 , and the air cylinder 323 is electrically connected to the controller 4 . Driven by the air cylinder 323, it is easier to control, and the C-shaped splint 324 is provided to make the probe holder 325 easier to disassemble and assemble.

In a preferred embodiment, the probe lifting base 32 is provided with a cylinder mounting frame 327 whose vertical position is adjustable, and the cylinder 323 is arranged on the cylinder mounting frame 327 . In a specific embodiment, the adjustment of the vertical position of the cylinder mounting frame 327 can be realized by setting an adjustment screw, a rack and the like. The cylinder mounting frame 327 with an adjustable vertical position is provided, and its function is to reduce the control requirements for the stroke of the cylinder 323 during the detection operation. Before the detection, move the piston of the cylinder 323 downward to the maximum stroke, adjust the height of the cylinder mounting frame 327, so that the distance between the ultrasonic probe 326 and the surface of the shaft to be detected meets the detection requirements. When testing the same batch of shafts , the piston of the cylinder 232 can be detected when it moves down to the maximum stroke, and there is no need to calculate and set the distance of each movement of the piston of the cylinder 232, which simplifies the control procedure.

In a preferred embodiment, as shown in FIG. 7 , a pair of clamping blocks 328 are provided on the probe holder 325 , and the clamping blocks 328 have clamping grooves that match with the C-type splint 324 at opposite positions, and the C-type splint 324 Insert into the card slot. By arranging the clamping block 328 and the clamping slot, the operation of disassembling and assembling the probe holder 325 is further simplified, and the probe holder 325 can be easily disassembled, assembled and replaced. In a specific embodiment, the blocking block 328 may be fixedly disposed on the probe frame 325, or may be relatively movable and elastically disposed on the probe frame 325 with an inward return.

To sum up, the ultrasonic detection device for shaft parts provided by the present invention effectively overcomes the problems of complex structure, inconvenient operation, and high requirements on the surface smoothness of the parts to be detected, etc. value and use.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. An ultrasonic nondestructive testing device for shaft parts, comprising a testing table (1) and a controller (4), characterized in that: The detection workbench (1) is provided with a coupling water tank (2) and a cantilever beam unit (3); a pair of rollers (21) parallel to each other and having the same diameter are arranged in the coupling water tank (2) along the horizontal direction, The rollers (21) are all worn on the box wall of the coupling water tank (2), and a bearing (22) and a sealing sleeve (23) are provided at the connection between the roller (21) and the box wall; A timing belt (25) is connected between the rollers (21) outside the coupling water tank (2); the rollers (21) include a driving roller and a driven roller, wherein the driving roller is formed by The deceleration motor (24) arranged on the detection table (1) is driven to rotate in the axial direction, and drives the driven rollers to rotate in the same direction and at the same speed through the synchronous belt (25); The cantilever beam unit (3) is provided with a beam (31), the beam (31) is located above the coupling water tank (2) and is parallel to the roller (21); on the beam (31) A linear guide rail (311) is provided along the length direction, a probe lifting seat (32) is movably provided along the linear guide rail (311), and a probe lifting seat (32) is provided with a probe frame (325) that can move up and down ), the probe frame (325) is provided with a plurality of ultrasonic probes (326) facing downward along the direction parallel to the axis of the roller (21); The deceleration motor (24), the probe lifting seat (32) and the ultrasonic probe (326) are all connected to the controller (4) in a circuit. 2. The ultrasonic non-destructive testing device for shaft parts according to claim 1, wherein the sealing sleeve (23) and the bearing (22) are both sleeved on the roller (21), The sealing sleeve (23) is connected to the inner wall and the outer wall of each connection between the box wall of the coupling tank (2) and the roller (21); the inner cavity wall of the sealing sleeve (23) is provided with several An annular groove (231) surrounding the roller (21), a sealing ring (232) is embedded in the annular groove (231), and the sealing ring (232) is sleeved on the roller (21) and is pressed into the annular groove (231) by the roller (21); a bearing sleeve (221) is provided outside the bearing (22), and the bearing sleeve (221) is connected to the On the sealing sleeve (23), a pressing plate (222) is sleeved on the roller (21), and the pressing plate (222) is connected to the bearing sleeve (221). 3 . The ultrasonic nondestructive testing device for shaft parts according to claim 2 , characterized in that: between the sealing sleeve ( 23 ) and the wall of the coupling water tank ( 2 ), the bearing sleeve ( 221 ) Between the sealing sleeve (23) and the pressing plate (222) and the bearing sleeve (221), sealing gaskets are provided. 4. The ultrasonic nondestructive testing device for shaft parts according to claim 1, characterized in that: each of the rollers (21) comprises a connecting section located at both ends and a detection piece supporting section located in the middle section, the The connecting section is connected to the box wall of the coupling water tank (2) through the bearing (22) and the sealing sleeve (23), and the connecting section and the detecting part supporting section are coaxially assembled and connected. 5. The ultrasonic non-destructive testing device for shaft parts according to claim 4, characterized in that: a pair of axially adjustable positions are respectively sleeved on the support sections of the detection parts of each of the rollers (21). There are limit wheels (26), and the opposite surfaces of each pair of limit wheels (26) are vertical planes. 6. The ultrasonic non-destructive testing device for shaft parts according to claim 4, characterized in that: a plurality of friction wheels ( 27), the position of the friction wheel (27) along the axial direction of the roller (21) is adjustable. 7. The ultrasonic nondestructive testing device for shaft parts according to claim 1, characterized in that: a screw rod (311) parallel to the linear guide rail (32) is provided on the beam (31), and the The probe lifting seat (32) is provided with a slider (321) that can slide along the linear guide rail (311) and a transmission block (322) that is matched and connected with the screw rod (312); the screw rod (312) Driven by a servo motor (313) arranged on the beam (31) to rotate in the axial direction, when the lead screw (312) rotates, the probe lifting seat (32) is driven along the straight line by the transmission block (322) The guide rail (311) moves horizontally; the servo motor (313) is electrically connected with the controller (4). 8. The ultrasonic non-destructive testing device for shaft parts according to claim 1, characterized in that: a vertically downward air cylinder (323) is provided on the probe lifting seat (32), and the air cylinder (323) ) The top end of the piston is connected with a C-type splint (333), the C-type splint (324) is driven by the cylinder (323) to move up and down, and the probe holder (325) is mounted on the C-type splint (324) ; The cylinder (323) is electrically connected with the controller (4). 9 . The ultrasonic non-destructive testing device for shaft parts according to claim 8 , wherein: the lifting seat ( 32 ) is provided with a cylinder mounting frame ( 327 ) whose vertical position is adjustable, and the cylinder ( 323) is arranged on the cylinder mounting bracket (327). 10. The ultrasonic nondestructive testing device for shaft parts according to claim 8, characterized in that: a pair of clamping blocks (328) are provided on the probe frame (325), and the clamping blocks (328) are arranged in relative positions. There is a card slot matched with the C-shaped splint (324), and the C-shaped splint (324) is inserted into the card slot.

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