Torque compensator torque testing device and testing method

Abstract

The invention discloses a torsion compensator torque testing device and method. The testing device comprises a machine body, a lifting platform and a rotating platform, wherein the lifting platform and the rotating platform are connected with the upper portion and the lower portion of a test piece respectively. The lifting platform is in lifting fit with the body; the rotating platform is rotationally matched with the machine body; the lifting mechanism is used for driving the lifting platform to lift; the rotating mechanism is used for driving the rotating platform to rotate; a force value sensor is further arranged between the lifting platform and the machine body. The device is simple in structure, and can be used for carrying out torsion test and fatigue test on the large-size torsion compensator. And test equipment is outstanding in capability. Corresponding test requirements are met, and the accuracy of test results is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection devices, and in particular relates to a torsion compensator torque testing device and a testing method. Background Art

[0002] A torsion compensator is used to compensate for the torsion of a pipeline. It usually includes a sleeve and a core tube that rotate together, and a sealing structure is provided between the sleeve and the core tube. The sealing structure is usually evaluated by using an external force to make the sleeve and the core tube rotate relative to each other under a pressurized state, and the sealing is evaluated by measuring the torque generated and combining it with leakage. When the existing torsion compensator test device performs a torsion test, one end of the compensator is usually fixed, and the other end is rotated by a rotating mechanism. By measuring the torque of the rotation, the torque of the torsion compensator is obtained, thereby achieving the purpose of testing or assessing the life of the torsion compensator.

[0003] In the existing test device, the torque measurement error is large, and when high torque (over 1000Nm) needs to be measured, it is difficult to reach the corresponding torque value, resulting in the inability to perform high-torque torsional compensator torque measurement and fatigue life assessment. Summary of the invention

[0004] The purpose of the present invention is to provide a torsion compensator torque testing device to solve the problems in the prior art.

[0005] The present invention is realized by the following technical scheme: a torsion compensator torque test device, characterized in that: it comprises a fuselage, and a lifting platform and a rotating platform respectively connected to the upper and lower parts of the test piece; the lifting platform is lifting-coordinated with the fuselage; the rotating platform is rotating-coordinated with the fuselage; It also includes a lifting mechanism for driving the lifting platform to lift and lower, and a rotating mechanism for driving the rotating platform to rotate; a force sensor is also arranged between the lifting platform and the fuselage.

[0006] Further: the rotating platform includes a turntable, a gear ring is arranged on the outer side of the turntable, a hydraulic motor is arranged on the side of the turntable, and the driving end of the hydraulic motor cooperates with the gear ring through a driving gear; a bolt groove for fixing the flange is arranged on the top of the turntable.

[0007] Furthermore: it also includes an encoder, the encoder body is matched with the machine body, and the measuring end is matched with the turntable.

[0008] Further: the lifting platform includes a main beam, both ends of which cooperate with grooves on the side panels of the fuselage; a lead screw is arranged in the groove, and a lifting motor for driving the lifting platform to rise and fall along the lead screw is arranged on the main beam.

[0009] Further: the force sensor is arranged on the inner side of the groove and matched with the two ends of the main beam.

[0010] The present invention also discloses a method for testing the torque of a torsion compensator, comprising the following steps: Step 1: Fix the two ends of the test piece on the lifting platform and the rotating platform through flanges respectively; Step 2: Start the hydraulic motor to drive the rotating platform to rotate, and monitor the rotation angle through the encoder; Step 3: Record the data measured by the force sensor, obtain the torsion force, and calculate the torque based on the length of the main beam.

[0011] The beneficial effects of the present invention are as follows: the present invention has a simple structure, can perform torque test and fatigue test on a large-volume torsion compensator, has outstanding test equipment capabilities, satisfies corresponding test requirements, and improves the accuracy of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the main structure of the present invention; Figure 3 It is a left-side structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the top structure of the present invention.

[0013] Explanation of the serial numbers in the figure: 1 is the fuselage; 2 is the rotating platform; 3 is the lifting platform; 5 is the force sensor; 6 is the encoder; 8 is the test piece.

[0014] 11 is a groove; 21 is a rotating disk, 22 is a gear ring, 23 is a hydraulic motor, and 24 is a bolt groove; 31 is the main beam, 32 is the lead screw, 33 is the lifting motor; 34 is the longitudinal beam, and 35 is the reinforcing beam. DETAILED DESCRIPTION

[0015] Reference Figure 1-4 The present invention provides a torsion compensator torque testing device for measuring the torsion moment of the torsion compensator, which comprises: Fuselage 1, used to arrange and support the overall structure; The lifting platform 3 is fixed to the upper side of the test piece 8 (the flange of the core tube), and the torque is measured while keeping it balanced; The rotating platform 2 is matched with the rotation of the fuselage and fixed to the lower side of the test piece 8 (the flange of the casing), and provides a torsional force to the test piece through its own rotation; The lifting platform 3 cooperates with the body 1 to accommodate test pieces of different heights. It also includes a lifting mechanism for driving the lifting platform 3 to lift and a rotating mechanism for driving the rotating platform 2 to rotate; A force sensor 5 is also provided between the main beam 31 of the lifting platform 3 and the fuselage 1, which is used to measure the reaction force, i.e., the torque, that the upper part of the test piece is subjected to in order to maintain balance when the lower part of the test piece is twisted. The main beam and the force sensor are in contact or as small a gap as possible, so that the force on the force sensor is zero when not twisted, and there is no distance deviation when twisted.

[0016] Preferably, a longitudinal beam 34 is vertically arranged in the middle of the main beam 31, and a reinforcing beam 35 is arranged between the main beam and the longitudinal beam to improve the overall strength, thereby improving the stability and force bearing capacity of the rotating platform and the strength when the test piece is bolted. At the same time, the frame-type structure exposes more of the upper part, which is convenient for avoiding the connection port and exhaust port of the test piece and the press.

[0017] Preferably, the rotating platform 2 includes a rotating disk 21 that rotates with the machine body, a gear ring 22 is fixedly arranged on the outside or lower side of the rotating disk 21, a hydraulic motor 23 is arranged on the machine body at the side of the rotating disk 21, and the driving end of the hydraulic motor 23 meshes with the gear ring 22 through a driving gear; a bolt groove 24 for fixing the flange of the test piece is arranged above the rotating disk 21. The bolt grooves are multiple and are distributed along the radial direction of the rotating disk, corresponding to the hole positions of the flange, and the groove-shaped structure can meet the fixing needs of flanges of different sizes.

[0018] Preferably, an encoder 6 is also included, the encoder 6 body is matched with the fuselage 1, and the measuring end is coaxially matched with the turntable 21, so that the rotation angle thereof can be effectively measured and monitored.

[0019] Preferably, the lifting platform 3 includes a main beam 31, both ends of which cooperate with the grooves 11 on the side panels of the fuselage; a lead screw 32 is arranged in the groove 11, and a lifting motor 33 for driving the lifting platform 3 to rise and fall along the lead screw 32 is arranged on the main beam.

[0020] Furthermore, a screw seat that cooperates with the screw is provided on the lifting platform 3, and a screw ring is rotatably provided inside the screw seat. The screw ring is sleeved on the screw, and the inner diameter cooperates with the screw thread; helical teeth are provided on the outside of the screw, and a transmission rod is bidirectionally provided on the reducer of the lifting motor, and a helical gear that cooperates with the helical teeth on the outside of the screw is provided on the end of the transmission rod. The lifting motor drives the transmission rod, and the transmission rod drives the screw ring through the helical gear. The rotation of the screw ring drives the lifting platform to rise and fall.

[0021] Furthermore, the lead screw is elastically lifted and lowered in coordination with the bottom of the groove. Specifically, a bottom plate is fixedly provided at the lower end of the lead screw, through holes are provided at both ends of the bottom plate, and the through holes are sleeved on the guide posts on the groove. The guide posts are fixed at the bottom of the groove. The above structure enables the bottom plate together with the lead screw to be lifted and lowered in coordination with the fuselage. A spring is provided between the lower surface of the bottom plate and the bottom surface of the groove of the fuselage. The spring can buffer the vertical force generated during the test, and at the same time can reduce the impact on the data measured by the force sensor.

[0022] Preferably, the force sensor 5 can test the pressure between the main beam and the fuselage. There are four groups of force sensors, which are arranged on the inner side of the groove 11 and matched with the two ends of the main beam 31.

[0023] The present invention also discloses a method for testing the torque of a torsion compensator, which uses the torsion compensator torque testing device as described above and comprises the following steps: Step 1: Fix the two ends of the test piece 8 on the lifting platform 3 and the rotating platform 2 respectively through flanges and bolts. The height can be adjusted through the lifting platform. The workpiece can also be pressurized as needed. Step 2: Start the hydraulic motor 23 to drive the rotating platform 2 to rotate, and monitor the rotation angle through the encoder 6; according to the test purpose, reverse or maintain after reaching the angle; Step 3: Record the data measured by the force sensor 5, obtain the torsion, and calculate the torque according to the torque formula based on the effective length of the main beam, that is, the effective distance from the center to the force sensor 5. Specifically, Figure 4 As shown, the four force sensors are F1, F2, F3, and F4, and R is the center of the test piece. The torque is calculated as follows: When rotating clockwise, the torque T 顺 = (F1+F4) x R; When rotating counterclockwise, the torque T 逆 = (F2+F3) x R; Among them, F1, F2, F3, and F4 are the measurement values ​​of each sensor, and R is the distance from the center to the sensor.

[0024] In this solution, the driving and measuring are separated. The casing part of the test piece is driven by a hydraulic motor at the bottom. The main beam above the test piece is kept stable through the contact of the force sensor while measuring the torque, which reduces the influence of the driving process on the measurement and improves the accuracy of the measurement result. At the same time, the driving motor below can be set in multiple groups to improve the driving force. The sensor of the measuring device cooperates with the end of the main beam, and the main beam acts as a lever. Under the same torque conditions, the data measured by the sensor is small and the measurement accuracy is high.

[0025] Embodiment: The specimen model is XZ-200-4.0-400-H. After the specimen is installed and fixed according to the above method, a torque test and a fatigue test are performed on the specimen.

[0026] Torque test: The test piece is slowly pressurized to the test pressure (1 times the design pressure), and then rotated 360° from a stationary state. The maximum torque tolerance during the test should not exceed +55% of the nominal torque.

[0027] The test medium is water, the test pressure is 4.0MPa; rotation is 360°; the maximum torque value is 1265.46N·m; the deviation from the nominal torque is -29.9%; the result is in compliance with the requirements.

[0028] Fatigue test: The test piece is slowly pressurized to the test pressure (1 times the design pressure) and rotated back and forth according to the design rotation angle for one cycle. After reaching the specified number of cycles (2000 times), there should be no leakage.

[0029] The test medium is water, the test pressure is 4.0MPa; the rotation angle is 45° (positive and negative angle); the number of cycles is 2000 times; there is no leakage; the result: meets the requirements.

[0030] In this solution, the driving and measuring are separated. The casing part of the test piece is driven by a hydraulic motor at the bottom. The main beam above the test piece is kept stable through the contact of the force sensor while measuring the torque, which reduces the influence of the driving process on the measurement and improves the accuracy of the measurement result. At the same time, the driving motor below can be set in multiple groups to improve the driving force. The sensor of the measuring device cooperates with the end of the main beam, and the main beam acts as a lever. Under the same torque conditions, the data measured by the sensor is small and the measurement accuracy is high.

Claims

1. A torsion compensator torque test device, characterized in that: It comprises a body (1), and a lifting platform (3) and a rotating platform (2) respectively connected to the upper and lower parts of a test piece (8); The lifting platform (3) cooperates with the fuselage (1) in lifting and lowering; The rotating platform (2) and the fuselage (1) are in rotational cooperation; It also includes a lifting mechanism for driving the lifting platform (3) to lift and lower, and a rotating mechanism for driving the rotating platform (2) to rotate; A force sensor (5) is also provided between the lifting platform (3) and the fuselage (1).

2. A torsion compensator torque testing device according to claim 1, characterized in that: The rotating platform (2) comprises a rotating disk (21), a gear ring (22) is arranged on the outer side of the rotating disk (21), a hydraulic motor (23) is arranged on the side of the rotating disk (21), and the driving end of the hydraulic motor (23) cooperates with the gear ring (22) through a driving gear; a bolt groove (24) for fixing a flange is arranged on the rotating disk (21).

3. A torsion compensator torque testing device according to claim 2, characterized in that: It also includes an encoder (6), the main body of the encoder (6) matches the body (1), and the measuring end matches the rotating disk (21).

4. A torsion compensator torque testing device according to claim 1, characterized in that: The lifting platform (3) comprises a main beam (31), the two ends of the main beam (31) being matched with grooves (11) on the side panels of the fuselage; a lead screw (32) is arranged in the groove (11), and a lifting motor (33) for driving the lifting platform (3) to move up and down along the lead screw (32) is arranged on the main beam.

5. A torsion compensator torque testing device according to claim 4, characterized in that: The force sensor (5) is arranged on the inner side of the groove (11) and matches with two ends of the main beam (31).

6. A method for testing torque of a torsion compensator, using the torsion compensator torque testing device according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Fixing the two ends of the test piece (8) on the lifting platform (3) and the rotating platform (2) respectively through flanges; Step 2: Start the hydraulic motor (23) to drive the rotating platform (2) to rotate, and monitor the rotation angle through the encoder (6); Step 3: Record the data measured by the force sensor (5), obtain the torsion force, and calculate the torque based on the length of the main beam.

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