CN217716922U

CN217716922U - Valve torque fatigue testing machine

Info

Publication number: CN217716922U
Application number: CN202221283545.4U
Authority: CN
Inventors: 袁聪; 党孝刚; 曹丽芳; 姜亚军; 钮飞; 左斌; 陈太; 刘晓峰; 乔冠蕾; 李月强; 宋万鹏
Original assignee: Shijiazhuang Zhongshi Testing Machine Co ltd
Current assignee: Shijiazhuang Zhongshi Testing Machine Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-11-01
Anticipated expiration: 2032-05-26

Abstract

The application discloses valve torque fatigue testing machine relates to valve torque fatigue detection equipment's technical field, has improved the inconvenient problem of valve clamping that awaits measuring, and it includes frame, test device and clamping device all set up in the frame, test device is located the top of clamping device, test device includes the organism, the inside test subassembly that has the torque fatigue detection function that is provided with of organism, test device still includes the drill chuck, the drill chuck is located test device's lower extreme, the valve that awaits measuring is installed fixed back on the clamping device, the drill chuck presss from both sides the valve rod tightly, test device still includes the universal joint telescopic link, the universal joint telescopic link includes the universal joint, be connected through the universal joint between organism and the clamping head. This application can make the clamping location of the valve that awaits measuring more convenient, can reduce the stress inequality in the testing process simultaneously, improves the accuracy of test result.

Description

Valve torque fatigue testing machine

Technical Field

The application relates to the technical field of valve torque fatigue detection equipment, in particular to a valve torque fatigue testing machine.

Background

The service life and the operation reliability of the universal valve, which is a widely used long-term product, are one of the key indexes for checking whether the product is qualified. The qualified valve can bear the conditions of repeated torsion opening and closing for a long time under a certain pressure, and the conditions of leakage, damage, failure and the like are avoided.

In a torque fatigue strength test of a valve, a valve torque fatigue tester is generally used. Clamping of valve that awaits measuring among current valve torque fatigue testing machine is shown as attached 4, including test device 4 that has moment of torsion fatigue strength test function and the equipment pipeline that is used for leading to water, has the valve rod connecting piece that is used for with the valve rod 13 complex of valve 1 that awaits measuring on test device 4, and when the clamping valve 1 that awaits measuring, need pass through adapter flange 6 and equipment pipe connection with the both ends of valve 1 that awaits measuring. The testing device 4 is hard connected with the valve rod 13 of the valve 1 to be tested, and the connecting piece of the valve rod 13 needs to be completely aligned with the valve rod 13 of the valve 1 to be tested to transmit the torque force.

Therefore, the clamping mode is complex in process, the position requirement during clamping is high, different valve rod 13 connecting pieces need to be replaced for the valves to be tested 1 of different models, the flange connecting pieces need to be replaced for each clamping, and a large amount of time and energy need to be consumed for dismounting once.

SUMMERY OF THE UTILITY MODEL

In order to improve the inconvenient problem of valve clamping that awaits measuring, this application provides a valve torque fatigue testing machine.

The application provides a valve torque fatigue testing machine adopts following technical scheme:

the utility model provides a valve moment of torsion fatigue test machine for carry out moment of torsion fatigue test to the valve that awaits measuring, including frame, test device and clamping device all set up in the frame, test device is located the top of clamping device, test device includes the organism, the inside test assembly who has moment of torsion fatigue test function that is provided with of organism, test device still includes the drill chuck, the drill chuck is located test device's lower extreme, the valve that awaits measuring installs fixed back on the clamping device, the drill chuck presss from both sides the valve rod tightly, test device still includes the universal joint telescopic link, the universal joint telescopic link includes the universal joint, be connected through the universal joint between organism and the drill chuck.

By adopting the technical scheme, the drill chuck can adapt to valve rods with different specifications and shapes, and can stably clamp the valve rods, so that the use is convenient; meanwhile, the universal joint can provide a certain position adjusting space in the process of clamping the valve rod by the drill chuck, and the position requirement required by the valve to be tested during clamping is reduced; the two combined actions can improve the connection effect between the testing device and the valve rod, so that the accuracy of the torque fatigue strength test result is improved, and the condition that the stress borne by the valve rod is unbalanced when the valve rod is twisted is reduced.

Optionally, the universal joint telescopic link includes two universal joints, and the universal joint telescopic link still includes the telescopic link, two the universal joint is connected with organism and drill chuck respectively, and two the universal joint is connected with the both ends of the flexible direction of telescopic link respectively.

By adopting the technical scheme, the flexibility ratio of the universal joint telescopic rod during use can be improved, the position requirement required during clamping of the valve to be tested is further reduced, and the position height of the drill chuck is conveniently adjusted.

Optionally, the clamping device includes a fixed seat and a movable seat, the valve to be tested is clamped between the fixed seat and the movable seat, a first slide rail is fixedly connected to the frame along the horizontal direction, the fixed seat is fixedly connected to the frame, and the movable seat is slidably connected to the first slide rail.

By adopting the technical scheme, the clamping device can adapt to valves to be tested with different lengths, and the valves to be tested can be conveniently clamped and positioned on the clamping device.

Optionally, the clamping device further includes two clamping assemblies, the two clamping assemblies are respectively connected with the fixed seat and the movable seat, a clamping space for clamping the valve to be tested is formed between the two clamping assemblies, each clamping assembly includes a clamp flange for positioning the valve to be tested and a fixing flange for fixing the clamp flange, the fixing flange is located on one side, away from the clamping space, of the clamp flange, the fixing flange is connected with the clamp flange, and a first mounting hole for inserting and mounting the experimental pipe section is formed in the clamp flange.

By adopting the technical scheme, the valve to be tested can be conveniently connected with the fixed seat and the movable seat, and the clamping and positioning of the valve to be tested on the clamping device are further facilitated.

Optionally, the clamping device further includes a threaded guide rod for controlling the size of the clamping space, the length direction of the threaded guide rod is parallel to the length direction of the first slide rail, a threaded hole for the threaded connection of the threaded guide rod is formed in the movable seat, one end of the threaded guide rod is rotatably connected with the fixed seat, and the rotation axis of the threaded guide rod is parallel to the length direction of the threaded guide rod.

By adopting the technical scheme, the clamping device can be convenient for workers to adjust the size of the clamping space, and the adjusting precision is higher.

Optionally, a hand wheel is further disposed at one end of the threaded guide rod, which is far away from the fixing seat.

By adopting the technical scheme, the clamping device can further facilitate the adjustment of the size of the clamping space by workers.

Optionally, the clamp flange is provided with a plurality of O-ring seals in the first mounting hole.

Through adopting above-mentioned technical scheme, can improve the joint strength between valve to be measured and the anchor clamps flange, improve the leakproofness simultaneously, reduce the probability that infiltration, leak appear after the valve to be measured leads to water.

Optionally, the water supply device further comprises a water supply device, the water supply device comprises two water supply pipes used for communicating the water to the valve to be tested, second mounting holes matched with the end parts of the water supply pipes are formed in the fixing seat and the movable seat, and communication holes used for communicating the first mounting holes and the second mounting holes are formed in the fixing flange.

Through adopting above-mentioned technical scheme, the delivery pipe inserts the back of installing in the second mounting hole, and the valve that awaits measuring can carry out water service, makes the installation of delivery pipe more convenient to make the valve that awaits measuring can detect under the logical water condition, make things convenient for water service simultaneously.

Optionally, the water supply device further comprises a water tank, a multistage centrifugal pump and a high-pressure rubber pipe, the multistage centrifugal pump is connected with the water tank, one end, far away from the clamping space, of the water supply pipe is connected with the multistage centrifugal pump, the other end, far away from the clamping space, of the water supply pipe is connected with one end of the high-pressure rubber pipe, and the other end of the high-pressure rubber pipe is connected with the water tank.

By adopting the technical scheme, water circulation is formed between the two water supply pipes and the water tank under the action of the multi-stage centrifugal pump, so that the waste of water resources is reduced; meanwhile, the high-pressure rubber pipe can be elastically deformed so as to adapt to the sliding position of the movable seat on the first sliding rail.

Optionally, the test device further includes a sliding seat, the sliding seat is connected to the machine body, a second sliding rail for sliding connection of the sliding seat is further provided on the machine frame, and the length direction of the second sliding rail is parallel to the length direction of the first sliding rail.

By adopting the technical scheme, the drill chuck can be conveniently aligned with the valve rod, so that the process of clamping the valve rod by the drill chuck is further facilitated.

In summary, the present application includes at least one of the following benefits:

1. the clamping process of the valve to be tested can be more convenient and faster;

2. the stress on the valve rod in the torque fatigue test process can be more balanced, and the accuracy of the torque fatigue test result is improved.

Drawings

FIG. 1 is an overall view of a valve torque fatigue tester according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a valve under test in an embodiment of the present application;

FIG. 3 is a partial view of a valve torsional fatigue tester according to an embodiment of the present application;

fig. 4 is a diagram of a valve to be tested in the existing valve torque fatigue testing machine after being clamped.

Description of the reference numerals: 1. a valve to be tested; 11. a cavity; 12. an experimental pipe section; 13. a valve stem; 2. a frame; 21. a first slide rail; 22. a second slide rail; 3. a clamping device; 31. a clamping space; 32. a fixed seat; 33. a movable seat; 331. a slider; 332. a threaded hole; 34. clamping the assembly; 341. a clamp flange; 3411. a first mounting hole; 342. fixing the flange; 3421. a communicating hole; 35. a second mounting hole; 36. a seal ring; 37. a threaded guide rod; 38. a hand wheel; 4. a testing device; 41. a body; 42. a sliding seat; 43. a test assembly; 431. a servo motor; 432. a speed reducer; 433. a torque sensor; 44. a universal joint telescopic rod; 441. a universal joint; 442. a telescopic rod; 45. a drill chuck; 5. a water supply device; 51. a water tank; 52. a water supply pipe; 521. an electromagnetic flow meter; 522. a pressure sensor; 523. a temperature sensor; 53. a multistage centrifugal pump; 54. a drain pipe; 541. a water discharge electromagnetic valve; 55. a high-pressure rubber hose; 56. a water replenishing pipe; 561. an upper electromagnetic valve; 6. and (4) adapting the flange.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses valve torque fatigue testing machine.

Referring to fig. 1, the valve torque fatigue testing machine comprises a frame 2, wherein a clamping device 3 for clamping and positioning a valve 1 to be tested, a water supply device 5 for providing a pressure water source for the valve 1 to be tested and a testing device 4 for performing a torque fatigue test on the valve 1 to be tested are installed on the frame 2. After clamping the valve 1 to be tested on the clamping device 3 by a worker, the water supply device 5 enables the valve 1 to be tested to be in a water-through state, and meanwhile, the testing device 4 is used for performing a torque fatigue test on the valve 1 to be tested.

Referring to fig. 2 and 3, the valve 1 to be tested as a sample has a cavity 11 therein, and the cavity 11 penetrates through both ends of the valve 1 to be tested in a linear direction. The two ends of the valve 1 to be tested are provided with experiment pipe sections 12, the experiment pipe sections 12 are round pipes, the two experiment pipe sections 12 are connected with the valve 1 to be tested, the axes of the two experiment pipe sections 12 are overlapped, and the two experiment pipe sections 12 are communicated with each other through the cavity 11. The valve 1 to be tested is provided with a valve rod 13 for controlling the valve 1 to be tested to be opened and closed, the valve 1 to be tested is fixedly clamped on the clamping device 3 through the experiment pipe sections 12 at two ends, the axis of the experiment pipe section 12 is horizontal, and the valve rod 13 is vertically upward after the valve 1 to be tested is clamped.

The valve 1 to be tested and the experiment pipe section 12 are both plastic products generally, the connection mode between the valve 1 to be tested and the experiment pipe section is hot melt connection, and the valve to be tested is discarded after detection.

Referring to fig. 1 and 3, the frame 2 has a first slide rail 21 on which the clamping device 3 is mounted, and the first slide rail 21 is horizontal in the longitudinal direction. After the valve 1 to be tested is clamped, the axis of the experimental pipe section 12 on the valve 1 to be tested is parallel to the length direction of the first slide rail 21, and the valve 1 to be tested is positioned above the first slide rail 21 after being clamped.

Referring to fig. 1 and 3, the clamping device 3 includes a fixed seat 32 and a movable seat 33, the fixed seat 32 is fixedly connected to the frame 2, a sliding block 331 adapted to the first sliding rail 21 is disposed at the bottom of the movable seat 33, the movable seat 33 is slidably connected to the first sliding rail 21, and a sliding direction of the movable seat 33 is consistent with a length direction of the first sliding rail 21.

Referring to fig. 1 and 3, the clamping device 3 further includes two clamping assemblies 34 for clamping and positioning the valve 1 to be tested, the two clamping assemblies 34 are installed, the two clamping assemblies 34 are connected with one end of the fixed seat 32 away from the first slide rail 21 and one end of the movable seat 33 away from the first slide rail 21, and the two clamping assemblies 34 are respectively located at one end of the fixed seat 32 close to the movable seat 33 and one end of the movable seat 33 close to the fixed seat 32. A clamping space 31 for clamping and positioning the valve 1 to be tested is formed between the two clamping assemblies 34, and the size of the clamping space 31 changes along with the sliding of the movable seat 33.

The clamping assembly 34 includes a clamp flange 341 for clamping the end of the valve 1 to be tested and a fixing flange 342 for fixing the clamp flange 341 to the fixed seat 32 or the movable seat 33. The two fixing flanges 342 respectively abut against the fixing base 32 and the movable base 33, the two clamp flanges 341 respectively abut against the two fixing flanges 342, the clamp flanges 341 are located on one side of the fixing flanges 342 close to the clamping space 31, and the clamp flanges 341 are fixedly connected with the fixing base 32 or the movable base 33 through the fixing flanges 342 by means of screws.

Referring to fig. 3, the clamp flange 341 has a first mounting hole 3411 at a center thereof for inserting and mounting the end of the valve 1 to be tested, the first mounting hole 3411 is a circular hole, an axis of the first mounting hole 3411 is parallel to a length direction of the first slide rail 21, and axes of the first mounting holes 3411 of the two clamp flanges 341 are overlapped. The experimental pipe section 12 is fitted into the first mounting hole 3411, and the length of the first mounting hole 3411 is smaller than the length of the experimental pipe section 12.

In order to reduce the probability of water seepage and leakage at the connection position between the experimental pipe section 12 and the clamping assembly 34 after the valve 1 to be tested is filled with water, the clamp flange 341 is provided with a plurality of O-shaped sealing rings 36 in the first mounting holes 3411. The experimental pipe section 12 of the valve 1 to be tested is in interference fit with the first mounting hole 3411 through the plurality of O-shaped sealing rings 36, and after the experimental pipe section 12 is inserted into the first mounting hole 3411 for installation, the O-shaped sealing rings 36 deform and fill a gap between the outer side surface of the experimental pipe section 12 and the wall of the first mounting hole 3411.

Referring to fig. 3, the clamping device 3 further includes a threaded guide 37 for adjusting the size of the clamping space 31, and the threaded guide 37 is a cylindrical structure. The movable seat 33 is provided with a threaded hole 332 for the threaded guide rod 37 to penetrate through, one end of the threaded guide rod 37 is rotatably connected with the fixed seat 32, and the other end of the threaded guide rod 37 is located on one side of the movable seat 33 away from the clamping space 31. The axial direction of the threaded guide rod 37 is parallel to the length direction of the first slide rail 21, the rotation axis of the threaded guide rod 37 coincides with the own axis, and the threaded guide rod 37 is fixed on the fixed seat 32 along the axial direction.

The surface of one end, close to the fixed seat 32, of the threaded guide rod 37 is smooth, the surface of one end, far away from the fixed seat 32, of the threaded guide rod 37 is provided with an external thread, the hole wall of the threaded hole 332 is provided with an internal thread, the threaded guide rod 37 is in threaded fit with the threaded hole 332, and the movable seat 33 can be controlled to slide by rotating the threaded guide rod 37. In order to facilitate the worker to rotate the threaded guide rod 37, a hand wheel 38 is mounted on the end of the threaded guide rod 37 far away from the fixed seat 32.

Referring to fig. 1 and 3, the water supply device 5 includes water supply pipes 52 for transporting water, and the water supply pipes 52 are two in total. One end of each of the two water supply pipes 52 is connected to the fixed base 32 and the movable base 33, the fixed base 32 and the movable base 33 are both provided with a second mounting hole 35 adapted to the end of the water supply pipe 52, and the end of the water supply pipe 52 is inserted into the second mounting hole 35 for mounting and connection. The fixing flange 342 has a communication hole 3421 at a central position thereof for communicating the first mounting hole 3411 and the second mounting hole 35, and an axis of the second mounting hole 35 and an axis of the communication hole 3421 are coincident with an axis of the first mounting hole 3411. The aperture of the communication hole 3421 is smaller than the aperture of the first mounting hole 3411 and the aperture of the second mounting hole 35, the experimental pipe section 12 is inserted into the first mounting hole 3411 and abuts against the end surface of the fixing flange 342 close to the clamp flange 341, and the end of the water supply pipe 52 is inserted into the second mounting hole 35 and abuts against the end surface of the fixing flange 342 away from the clamp flange 341.

Referring to fig. 1 and 3, the water supply device 5 further includes a water tank 51 for storing water, and a multistage centrifugal pump 53, the water tank 51 is mounted at the bottom of the frame 2, and the water tank 51 is located below the first slide rail 21. A multistage centrifugal pump 53 is also fixedly connected to the frame 2, the multistage centrifugal pump 53 being located on one side of the water tank 51. Wherein, as for the water supply pipe 52 connected to the fixed seat 32, one end thereof far away from the fixed seat 32 is connected with the multistage centrifugal pump 53, and the multistage centrifugal pump 53 is connected with the water tank 51 through a pipeline; the water supply pipe 52 connected to the movable base 33 is connected to the water tank 51 through a high pressure hose 55 at an end thereof remote from the movable base 33. The water supply pipe 52 is a metal pipe, the high-pressure hose 55 is a hose, and the shape of the high-pressure hose 55 can be changed by bending along with the sliding of the movable base 33.

When the valve 1 to be tested is filled with water, the water in the water tank 51 flows into the cavity 11 of the valve 1 to be tested through the water supply pipe 52 driven by the multistage centrifugal pump 53, and then flows back into the water tank 51 through the other water supply pipe 52 and the high-pressure rubber pipe 55, so that water circulation is formed.

Referring to fig. 3, in order to control the water flow, an electromagnetic flow meter 521 is installed on the water supply pipe 52 connected to the fixing base 32, and the electromagnetic flow meter 521 is located at an end of the water supply pipe 52 adjacent to the water tank 51. Among them, the electromagnetic flowmeter 521 is used to detect the flow rate of water flowing from the water tank into the water supply pipe.

In order to monitor the water passing condition of the valve 1 to be tested, a pressure sensor 522 and a temperature sensor 523 are further installed on the water supply pipe 52 connected to the fixed seat 32, and both the pressure sensor 522 and the temperature sensor 523 are located at one end of the water supply pipe 52 close to the fixed seat 32. The pressure sensor 522 is used for detecting the water pressure in the pipeline, and the temperature sensor 523 is used for detecting the temperature of the water flow in the pipeline.

In order to facilitate the replacement of water in the water tank 51, a water discharge pipe 54 and a water replenishing pipe 56 for replacing water in the water tank 51 are further installed on the water tank 51, one ends of the water discharge pipe 54 and the water replenishing pipe 56 are connected and communicated with the water tank 51, one end of the water discharge pipe 54 close to the water tank 51 is provided with a water discharge electromagnetic valve 541 for controlling water to be discharged from the water tank, and one end of the water replenishing pipe 56 close to the water tank 51 is provided with a water supply electromagnetic valve 561 for controlling an external water source to replenish water in the water tank.

Referring to fig. 1 and 3, the rack 2 further has a second slide rail 22 for mounting the testing device 4, a length direction of the second slide rail 22 is parallel to a length direction of the first slide rail 21, and the second slide rail 22 is located above the clamping device 3. The testing device 4 includes a body 41 and a sliding seat 42, the sliding seat 42 is connected to the second slide rail 22, the body 41 is connected to the sliding seat 42, the sliding seat 42 is located above the second slide rail 22, and the body 41 is located above the sliding seat 42. The sliding seat 42 and the sliding block 331 are similar, and a braking member for fixing the sliding seat 42 on the second sliding rail 22 is also installed on the sliding seat 42.

Referring to fig. 2 and 3, the testing device 4 further includes a drill chuck 45 for clamping the valve rod 13, the drill chuck 45 is preferably a manual drill chuck 45, and a worker can manually adjust the size of a clamping opening of the drill chuck 45, so that the drill chuck 45 clamps the valve rod 13, and the drill chuck 45 is adapted to the valve rods 13 of the valves 1 to be tested in different models and shapes.

A test unit 43 for detecting the torque fatigue strength is mounted in the body 41, and the test unit 43 includes a servo motor 431, a reducer 432, and a torque sensor 433. The servo motor 431 is matched with the reducer 432 to control the drill chuck 45 to twist the valve rod 13, and the torque sensor 433 is used for detecting the torque required by twisting the valve rod 13.

Referring to fig. 3, the testing device 4 further includes a universal joint telescopic rod 44 for connecting the machine body 41 and the drill chuck 45, and the universal joint telescopic rod 44 includes two universal joints 441 and a telescopic rod 442. The telescopic rod 442 can be extended and retracted along the length direction thereof, and a stopper for fixing the extended and retracted length of the telescopic rod 442 is installed on the telescopic rod 442. The two universal joints 441 are respectively connected with two ends of the telescopic rod 442 in the length direction, one ends of the two universal joints 441 far away from the telescopic rod 442 are respectively connected with the machine body 41 and the drill chuck 45, and the rotating axes of the two universal joints 441 are parallel to each other. In the present embodiment, the universal joint 441 and the telescopic rod 442 are both prior art, and therefore, only a brief description thereof will be provided herein.

In this embodiment, the braking member may be a screw connection fixed brake or a latch limit brake, and the braking member is not limited too much and is omitted in the drawings.

The implementation principle of the valve torque fatigue testing machine in the embodiment of the application is as follows:

firstly, installing the experiment pipe sections 12 at two ends of the valve 1 to be tested to assist the clamping and positioning, then controlling the movable seat 33 to slide through the threaded guide rod 37, so that the clamping space 31 is expanded to facilitate the clamping of the valve 1 to be tested, then inserting one end experiment pipe section 12 of the valve 1 to be tested into the first mounting hole 3411 of the clamp flange 341 on the fixed seat 32 to be installed and fixed, after the valve 1 to be tested is installed, ensuring that the valve rod 13 of the valve 1 to be tested is vertically upward, then controlling the movable seat 33 to slide, inserting the other end experiment pipe section 12 of the valve 1 to be tested into the first mounting hole 3411 of the clamp flange 341 on the movable seat 33, then controlling the sliding seat 42 to slide to enable the drill chuck 45 to be aligned with the valve rod 13 in the vertical direction, then adjusting the position of the universal joint telescopic rod 44 through the universal joint telescopic rod 44, and simultaneously adjusting the size of the clamping opening of the universal joint 45 to enable the valve rod 13 to be clamped by the valve rod 45, then starting the valve torque fatigue testing machine, at this time, the multistage centrifugal pump 53 drives the water in the water tank 51 to circulate and enable the water to pass through the water, and then control the universal joint 44 to drive the drill chuck 45 to drive the torsional fatigue strength of the drill chuck 13 to be tested, thereby carrying out the torque fatigue test on the drill test the drill.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a valve moment of torsion fatigue test machine for carry out moment of torsion fatigue test to valve (1) that awaits measuring, a serial communication port, including frame (2), testing arrangement (4) and clamping device (3) all set up on frame (2), testing arrangement (4) are located the top of clamping device (3), testing arrangement (4) include organism (41), organism (41) inside is provided with test component (43) that have moment of torsion fatigue test function, testing arrangement (4) still include drill chuck (45), drill chuck (45) are located the lower extreme of testing arrangement (4), valve (1) that awaits measuring is after the installation is fixed on clamping device (3), drill chuck (45) press from both sides valve rod (13) tightly, testing arrangement (4) still include universal joint telescopic link (44), universal joint telescopic link (44) include universal joint (441), connect through universal joint (441) between organism (41) and drill chuck (45).

2. The valve torque fatigue testing machine as claimed in claim 1, wherein the universal joint telescopic rod (44) comprises two universal joints (441), the universal joint telescopic rod (44) further comprises a telescopic rod (442), the two universal joints (441) are respectively connected with the machine body (41) and the drill chuck (45), and the two universal joints (441) are respectively connected with two ends of the telescopic rod (442) in the telescopic direction.

3. The valve torque fatigue testing machine according to claim 1, wherein the clamping device (3) comprises a fixed seat (32) and a movable seat (33), the valve (1) to be tested is clamped between the fixed seat (32) and the movable seat (33), the frame (2) is fixedly connected with a first sliding rail (21) along the horizontal direction, the fixed seat (32) is fixedly connected with the frame (2), and the movable seat (33) is slidably connected with the first sliding rail (21).

4. The valve torque fatigue testing machine according to claim 3, wherein the clamping device (3) further comprises two clamping assemblies (34), the two clamping assemblies (34) are respectively connected with the fixed seat (32) and the movable seat (33), a clamping space (31) for clamping the valve (1) to be tested is formed between the two clamping assemblies (34), each clamping assembly (34) comprises a clamp flange (341) for positioning the valve (1) to be tested and a fixing flange (342) for fixing the clamp flange (341), the fixing flange (342) is located on one side, away from the clamping space (31), of the clamp flange (341), the fixing flange (342) is connected with the clamp flange (341), and the clamp flange (341) is provided with a first mounting hole (3411) for inserting and mounting the experimental pipe section (12).

5. The valve torque fatigue testing machine according to claim 4, wherein the clamping device (3) further comprises a threaded guide rod (37) for controlling the size of the clamping space (31), the length direction of the threaded guide rod (37) is parallel to the length direction of the first slide rail (21), a threaded hole (332) for the threaded connection of the threaded guide rod (37) is formed in the movable seat (33), one end of the threaded guide rod (37) is rotatably connected with the fixed seat (32), and the rotation axis of the threaded guide rod (37) is parallel to the length direction of the threaded guide rod (37).

6. The valve torque fatigue testing machine according to claim 5, wherein a hand wheel (38) is further arranged at one end of the threaded guide rod (37) far away from the fixed seat (32).

7. The valve torquefatigue tester according to claim 4, wherein the clamp flange (341) is provided with O-rings (36) in the first mounting holes (3411).

8. The valve torque fatigue testing machine according to claim 4, further comprising a water supply device (5), wherein the water supply device (5) comprises two water supply pipes (52) for supplying water to the valve (1) to be tested, the fixed seat (32) and the movable seat (33) are respectively provided with a second mounting hole (35) matched with the end part of the water supply pipe (52), and the fixed flange (342) is provided with a communication hole (3421) for communicating the first mounting hole (3411) with the second mounting hole (35).

9. The valve torque fatigue testing machine according to claim 8, wherein the water supply device (5) further comprises a water tank (51), a multistage centrifugal pump (53) and a high-pressure rubber hose (55), the multistage centrifugal pump (53) is connected with the water tank (51), one end of one water supply pipe (52) far away from the clamping space (31) is connected with the multistage centrifugal pump (53), one end of the other water supply pipe (52) far away from the clamping space (31) is connected with one end of the high-pressure rubber hose (55), and the other end of the high-pressure rubber hose (55) is connected with the water tank (51).

10. The valve torque fatigue testing machine according to claim 1, wherein the testing device (4) further comprises a sliding seat (42), the sliding seat (42) is connected with the machine body (41), the machine frame (2) is further provided with a second sliding rail (22) for the sliding seat (42) to be slidably connected, and the length direction of the second sliding rail (22) is parallel to the length direction of the first sliding rail (21).