A screw motor torque and rotating speed testing system and a testing method thereof

Abstract

The application discloses a screw motor torque and rotating speed testing system, which comprises a screw motor torque and rotating speed testing device, a fracturing pump pry, a water tank and a PLC controller. The screw motor torque and rotating speed testing device comprises a testing unit, a power unit and a cooling system. The testing unit comprises a main shaft and a disc brake. The screw motor torque and rotating speed testing device further comprises a tension and pressure sensor and a rotating speed sensor. The tension and pressure sensor is used for monitoring the torque of the disc brake, and the rotating speed sensor is used for monitoring the rotating speed of the main shaft. The PLC controller is electrically connected with the rotating speed sensor, the tension and pressure sensor, the fracturing pump pry, the disc brake, the power unit and the cooling system respectively. The application can realize constant (dynamic) torque testing, rotating speed testing, torque setting, remote control and other functions, effectively solves the existing problems and improves the reliability and stability of the oil connection construction.

Description

Technical Field

[0001] This invention relates to the field of oil drilling and production technology, and in particular to a screw motor torque and speed testing system and its testing method. Background Technology

[0002] Currently, the drilling and grinding of bridge plugs after staged fracturing of horizontal wells mainly uses coiled tubing both domestically and internationally. With the further development of unconventional oil and gas resources, the workload of drilling and grinding bridge plugs using coiled tubing is increasing year by year, as is the workload of screw motors. As the most important component of the drill string assembly, the screw motor is used to drive the drilling tools for drilling operations. At present, it is impossible to accurately test whether the screw can provide the corresponding performance under hydraulic drive conditions.

[0003] Currently, there is no dedicated testing equipment for screw motor torque and speed testing at coiled tubing operation sites. Workers rely solely on visual inspection to determine if the screw motor is operating normally. Existing on-site testing solutions suffer from high labor costs, low work efficiency, high safety and environmental risks, and inaccurate measurement values. Furthermore, they cannot test the dynamic torque and speed parameters of the screw during construction, making it impossible to accurately determine whether the screw motor meets the on-site construction requirements.

[0004] Patent application CN117804883A discloses a test bench and test method for directional drilling parameter inversion rock strength model. The test bench includes a hydraulic system, a rotary power system, a parameter measurement system, and a test frame. Both the hydraulic system and the rotary power system are mounted on the test frame. The hydraulic system includes a hydraulic device and a rock box. The hydraulic device is used to drive the rock box to move. The rotary power system includes a mud pump, a screw motor, and a drill bit. The mud pump is connected to the screw motor through a delivery system, which is used to deliver drilling fluid. The parameter measurement system includes a displacement measuring device, a drill pressure measuring device, a water pressure measuring device, a flow rate measuring device, and a rotational speed and torque measuring device.

[0005] However, when this patent tests the displacement, torque, and speed of a screw motor with a drill bit drilling and grinding rocks, the drilling and grinding load is achieved by driving the rock box to move through a hydraulic system. Changing the speed of the rock box changes the drilling and grinding load. This patent is limited to performance testing during drilling and grinding. Because the relationship between the hydraulic system's moving speed and the load is non-linear, it is difficult to accurately test the screw drilling and grinding torque and speed under dynamic load, resulting in a flawed test curve. Summary of the Invention

[0006] This invention aims to provide a screw motor torque and speed testing system and its testing method, which can realize multiple functions such as constant (dynamic) torque testing, speed testing, torque setting, and remote control, effectively solving existing problems and improving the reliability and stability of continuous oil production.

[0007] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A screw motor torque and speed testing system includes a screw motor torque and speed testing device, a fracturing pump skid, a water tank, and a PLC controller. The inlet of the fracturing pump skid is connected to the water tank, and the outlet of the fracturing pump skid is connected to the inlet of the screw motor torque and speed testing device. The fracturing pump skid provides power to the screw motor. The outlet of the screw motor torque and speed testing device is connected to the water tank. The screw motor torque and speed testing device includes a testing unit, a power unit, and a cooling system. The testing unit includes a main shaft and a disc brake. The main shaft has a hollow cylindrical structure, and the disc brake is sleeved on the outside of the main shaft. Both ends of the main shaft extend through the disc brake to the outside of the disc brake. The power unit and the cooling system are respectively connected to the disc brake. The screw motor torque and speed testing device also includes a tension / compression sensor and a speed sensor. The tension / compression sensor is used to monitor the torque of the disc brake, and the speed sensor is used to monitor the speed of the main shaft. The PLC controller is electrically connected to the speed sensor, the tension / compression sensor, the fracturing pump skid, the disc brake, the power unit, and the cooling system.

[0008] The tension / compression sensor is connected to the disc brake via a lever arm flange, and the speed sensor is mounted on the lever arm flange.

[0009] The top of the spindle is provided with a flange joint for connection with a screw motor.

[0010] The screw motor torque and speed testing device also includes a skid, which is a frame structure, and the testing unit, power unit and cooling system are located inside the skid.

[0011] A screw motor clamp is installed at the top of the skid, corresponding to the main shaft. The screw motor clamp rotates with the screw motor and is used to hold the screw motor. The clamp's jaws are arc-shaped, with a knurled surface and heat-sealed polyurethane material to increase the friction between the clamp and the screw. The screw motor clamp holds the screw by threading the jaw support rod.

[0012] The power unit includes an air compressor, which is connected to the disc brake air inlet via an air pipe. The disc brake air inlet is equipped with a proportional solenoid valve. By controlling the air flow of the proportional solenoid valve, the force with which the disc brake clamps the spindle can be controlled. The load provided by the disc brake is linearly related to the air flow of the proportional solenoid valve. The power unit control is as follows: the tester controls the air compressor to provide control air to the disc brake via a PLC, and then controls the air intake of the disc brake via the solenoid valve to adjust the clamping degree of the disc brake on the spindle.

[0013] The cooling unit includes a water pump and a water tank. The water tank outlet is connected to the disc brake inlet via the water pump, and the disc brake outlet is connected to the water tank inlet. The cooling unit control logic is as follows: the PLC controller controls the water pump speed and working time to achieve the coolant flow rate. At the same time, the cooling water tank is monitored in real time through cooling water temperature and cooling water level sensors to achieve automatic early warning of the cooling system, and then feedback is used to achieve the start and stop control of the cooling water pump.

[0014] The screw motor torque and speed testing device also includes a cooling water temperature sensor, a cooling water level sensor, and a cooling water pressure sensor. The cooling water temperature sensor, cooling water level sensor, and cooling water pressure sensor are electrically connected to the PLC controller. The cooling water temperature sensor is used to monitor the cooling water temperature, the cooling water level sensor is used to monitor the liquid level in the cooling water tank, and the cooling water pressure sensor is used to monitor the disc brake drainage pressure.

[0015] The cooling water temperature sensor and cooling water level sensor are installed inside the cooling water tank, and the cooling water pressure sensor is installed at the disc brake outlet.

[0016] A method for testing the torque and speed of a screw motor, comprising the following steps, using the aforementioned screw motor torque and speed testing system: S1. Test process connection: Connect the screw motor to the main shaft through the flange, and hold the screw motor with the screw motor clamp. Connect the fracturing pump skid to the top of the screw motor. S2. Dynamic no-load speed test: Set the disc brake proportional solenoid valve opening to 0%. The PLC controller controls the fracturing pump skid to adjust the fracturing pump skid injection rate from 100L / min to 500L / min. Each increase in the injection rate is 100L / min with a time interval of 1min. Record the speed at different injection rates and measure the no-load speed of the screw motor. S3. Dynamic torque and speed test: When the injection displacement reaches 500L / min, the PLC controller adjusts the opening of the disc brake proportional solenoid valve from 0% by controlling the disc brake clamping control valve. The proportional solenoid valve increases the opening by 5% in a single step, with a time interval of 30s, until the screw motor stops. Record the speed and torque under different loads at the current displacement. S4. Static Torque Test: After the motor stops, gradually reduce the opening of the proportional solenoid valve by 1% in a single step until the screw motor restarts. Record the critical torque of the screw motor and the opening of the proportional solenoid valve. After the screw motor starts rotating, gradually reduce the opening of the proportional solenoid valve by 10% in a single step with an interval of 10 seconds until the opening drops to 0%, allowing the screw to resume its operating speed and returning to the current displacement no-load test state. S5. Dynamic torque, speed and static torque test under different displacements: Control the fracturing pump skid to gradually reduce the displacement by 100L / min at a time, and repeat steps S3-S4 one by one to measure the dynamic torque, speed and static torque under different displacements and loads until the displacement is reduced to 0, thus completing the screw motor performance test.

[0017] The beneficial effects of this invention are: 1. In this invention, the opening of the proportional solenoid valve of the disc brake is controlled by the PLC controller, thereby controlling the clamping force of the disc brake on the screw motor. The load is provided by clamping the screw motor along the main shaft, simulating the real load when the screw motor is working. During the test, the screw torque and speed are measured by tension and compression sensors and speed sensors, so the dynamic and static torque and operating speed of the screw motor under different displacements can be measured. This invention is simple to operate, easy to move, and highly efficient in testing. It can effectively solve existing problems and improve the reliability and stability of continuous oil production.

[0018] 2. To prevent overheating of the disc brake during testing, this invention uses a PLC controller to control the water pump, which supplies liquid through the disc brake cooling pipeline to achieve water cooling of the disc brake, ensuring that the disc brake is at its normal operating temperature during testing. The cooling water level sensor and water temperature sensor monitor the cooling system status in real time, and if any abnormality occurs, the controller automatically stops the water pump to achieve self-protection.

[0019] 3. This invention performs pre-operation testing on the working capacity of the screw, and can realize functions such as constant (dynamic) torque testing, speed testing, and remote control. The testing process can be controlled remotely via a program with one click. The test results are torque-displacement-time test curves, which can be automatically saved for easy data analysis.

[0020] 4. This invention achieves linear load loading by controlling the disc brake opening, and tests the continuous oil pipe torque and speed under different loads according to the test method, forming a more complete screw performance test curve, which better reflects the true performance of the screw motor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the screw motor torque and speed testing system of the present invention.

[0022] Figure 2 This is a top view of the screw motor torque and speed testing device of the present invention.

[0023] Figure 3 This is a side view of the screw motor torque and speed testing device of the present invention.

[0024] Figure 4 This is a perspective view of the screw motor torque and speed testing device of the present invention.

[0025] Figure 5 This is a schematic diagram of the screw motor torque and speed testing method of the present invention.

[0026] The components include: 1. Screw motor torque and speed testing device; 2. Fracturing pump skid; 3. Water tank; 4. PLC controller. 11. Test unit; 12. Power unit; 13. Cooling system; 111. Spindle; 112. Disc brake; 113. Tension / compression sensor; 114. Speed ​​sensor; 115. Lever arm flange; 116. Flange joint; 117. Skid; 118. Screw motor clamp; 121. Air compressor; 122. Proportional solenoid valve; 131. Water pump; 132. Water tank. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0028] Example 1 This embodiment provides a method such as Figure 1-4 The screw motor torque and speed testing system shown includes a screw motor torque and speed testing device 1, a fracturing pump skid 2, a water tank 3, and a PLC controller 4. The inlet of the fracturing pump skid 2 is connected to the water tank 3, and the outlet of the fracturing pump skid 2 is connected to the inlet of the screw motor torque and speed testing device 1. The fracturing pump skid 2 is used to provide power to the screw motor. The outlet of the screw motor torque and speed testing device 1 is connected to the water tank 3. The screw motor torque and speed testing device 1 includes a testing unit 11, a power unit 12, and a cooling system 13. The testing unit 11 includes a main shaft 111 and a disc brake 112. The main shaft 111 has a hollow cylindrical structure, and the disc brake 112 is sleeved on the outside of the main shaft 111. Both ends of the main shaft 111 extend through the disc brake 112. In addition, the power unit 12 and the cooling system 13 are respectively connected to the disc brake 112. The screw motor torque and speed testing device 1 also includes a tension / compression sensor 113 and a speed sensor 114. The tension / compression sensor 113 is used to monitor the torque of the disc brake 112, and the speed sensor 114 is used to monitor the speed of the spindle 111. The PLC controller 4 is electrically connected to the speed sensor 114, the tension / compression sensor, the fracturing pump skid 2, the disc brake 112, the power unit 12, and the cooling system 13. The tension / compression sensor 113 is connected to the disc brake 112 through the lever arm flange 115, and the speed sensor 114 is mounted on the lever arm flange 115. The top of the spindle 111 is provided with a flange joint 116 for connecting to the screw motor.

[0029] In this embodiment, the screw motor is connected to the main shaft 111 via a connecting flange at the top of the main shaft 111, and the fracturing pump skid 2 is connected to the top of the screw motor. Turning on the fracturing pump skid 2 provides power to the screw motor, driving the screw motor to rotate. The screw motor drives the main shaft 111 to rotate, and the power unit 12 provides power to the disc brake 112. By controlling the air pressure provided by the power unit 12, the clamping degree of the disc brake 112 on the main shaft 111 is controlled, thereby indirectly controlling the load on the screw. By providing a load to the screw through the main shaft 111, the stress state of the screw during construction is simulated. Then, by measuring the screw torque and speed through the tension / compression sensor 113 and the speed sensor 114, the torque output by the screw and its own speed in the simulation experiment can be obtained.

[0030] The testing methods are divided into manual testing and automatic testing, both of which can be remotely controlled for observation and control. Speed ​​measurement involves the speed sensor 114 recording the number of revolutions of the spindle 111 within a certain time period. The PLC controller 4 receives and processes the signal from the speed sensor 114 to calculate the screw's speed. Torque measurement is performed using a tension / compression sensor 113 connected to the lever arm flange 115 of the disc brake 112. The measured torque value varies with the magnitude of sensor deformation. One end of the tension / compression sensor 113 is connected to the lever arm flange 115. During measurement, the screw drives the main shaft 111 to rotate, and the disc brake 112 clamps the main shaft 111. The main shaft 111 provides a reverse torque to the disc brake 112, causing a slight twist in the lever arm flange 115 connected to the disc brake 112, which in turn pulls the tension / compression sensor 113, causing deformation. The signal from the tension / compression sensor 113 is transmitted to the controller. The controller linearly calculates the torque on the disc brake 112 based on the parameters of the tension / compression sensor 113. When the main shaft 111 rotates at a constant speed or is clamped and stationary, the torque on the disc brake 112 is equal to the torque output by the screw. The test data is then collected by the control system within the controller, and the collected torque and speed data are displayed on the screen. Operators can easily observe whether the test screw is qualified through the display screen.

[0031] Example 2 Compared with Embodiment 1, the difference in this embodiment is that the screw motor torque and speed testing device 1 further includes a skid 117, which is a frame structure. The testing unit 11, the power unit 12, and the cooling system 13 are disposed inside the skid 117. A screw motor clamp 118 is provided at the top of the skid 117 corresponding to the position of the main shaft 111. The screw motor clamp 118 is rotatably engaged with the screw motor and is used to clamp the screw motor. The rest of the structure is the same as in Embodiment 1.

[0032] In this embodiment, the screw motor torque and speed testing device 1 is integrated into the skid 117, which facilitates transportation. A screw motor clamp 118 is provided at the top of the skid 117, corresponding to the main shaft 111. The clamping jaws of the screw motor clamp 118 are arc-shaped, and their surfaces are knurled and heat-sealed with polyurethane material to increase the friction between the clamping disc and the screw. The screw motor clamp 118 clamps the screw by threading the clamping jaw top rod.

[0033] Example 3 Compared with Embodiment 1, the difference in this embodiment is that the power unit 12 includes an air compressor 121, which is connected to the air inlet of the disc brake 112 via an air pipe. The air inlet of the disc brake 112 is equipped with a proportional solenoid valve 122, and the force entering the disc brake 112 to clamp the main shaft 111 can be controlled by controlling the air flow of the valve. The rest of the structure is the same as in Embodiment 1.

[0034] In this embodiment, the load provided by the disc brake 112 is linearly related to the air flow of the electromagnetic proportional valve. Its power unit 12 controls the air compressor 121 to provide control air source for the disc brake 112 through the PLC, and then controls the air intake of the disc brake 112 through the electromagnetic valve to adjust the clamping degree of the disc brake 112 on the spindle 111.

[0035] Example 4 The difference between this embodiment and embodiment 1 is that, in this embodiment, the cooling unit includes a water pump 131 and a water tank 132. The outlet of the water tank 132 is connected to the inlet of the disc brake 112 through the water pump 131, and the outlet of the disc brake 112 is connected to the inlet of the water tank 132. The rest of the structure is the same as in embodiment 1.

[0036] In this embodiment, the cooling unit control logic is as follows: the PLC controller 4 controls the speed and working time of the water pump 131 to realize the coolant flow rate, and at the same time realizes the real-time monitoring of the cooling water tank 132 through the cooling water temperature and cooling water level sensors, realizes the automatic early warning of the cooling system 13, and then feeds back to realize the start and stop control of the cooling water pump 131.

[0037] Example 5 Compared with Embodiment 1, the difference in this embodiment is that the screw motor torque and speed testing device 1 further includes a cooling water temperature sensor, a cooling water level sensor, and a cooling water pressure sensor. The cooling water temperature sensor, cooling water level sensor, and cooling water pressure sensor are electrically connected to the PLC controller 4. The cooling water temperature sensor is used to monitor the temperature of the cooling water, the cooling water level sensor is used to monitor the liquid level in the cooling water tank 132, and the cooling water pressure sensor is used to monitor the drainage pressure of the disc brake 112. The cooling water temperature sensor and the cooling water level sensor are installed inside the cooling water tank 132, and the cooling water pressure sensor is installed at the outlet of the disc brake 112. The rest of the structure is the same as in Embodiment 1.

[0038] In this embodiment, the disc brake 112 brakes by clamping the brake pads and gears. To prevent the large amount of heat generated from causing test component failure, the disc brake 112 cooling system 13 is used for continuous cooling during the test. The water temperature sensor is used to monitor the water temperature of the cooling system 13, the cooling water level sensor monitors the water level inside the cooling water tank 132 in real time to prevent the disc brake 112 from being damaged due to insufficient cooling caused by a low water level, and the cooling water pressure sensor monitors the outlet water pressure of the cooling water pump 131. In summary, the three sensors work together to monitor whether the cooling system 13 is working properly, thereby ensuring the continuous and reliable cooling of the disc brake 112.

[0039] Example 6 This embodiment provides a method such as Figure 5 The screw motor torque and speed testing method shown above, which uses the screw motor torque and speed testing system described above, completes the screw motor torque and speed test, including the following steps: S1. Test process connection: Connect the screw motor to the main shaft 111 through the flange, and clamp the screw motor with the screw motor clamp 118. Connect the fracturing pump skid 2 to the top of the screw motor. S2. Dynamic no-load speed test: Set the opening of the disc brake 112 proportional solenoid valve 122 to 0%. The PLC controller 4 controls the fracturing pump skid to adjust the injection rate of the fracturing pump skid from 100L / min to 500L / min. Each increase in the injection rate is 100L / min, with a time interval of 1min. Record the speed at different injection rates and measure the no-load speed of the screw motor. S3. Dynamic torque and speed test: When the injection displacement reaches 500L / min, the PLC controller 4 adjusts the opening of the proportional solenoid valve 122 of the disc brake 112 from 0% by controlling the clamping control valve of the disc brake 112. The proportional solenoid valve 122 increases the opening by 5% in a single step, with a time interval of 30s, until the screw motor stops. Record the speed and torque under different loads at the current displacement. S4. Static Torque Test: After the motor stops, gradually reduce the opening of the proportional solenoid valve 122 by 1% in a single step until the screw motor restarts. Record the critical torque of the screw motor and the opening of the proportional solenoid valve 122. After the screw motor starts rotating, gradually reduce the opening of the proportional solenoid valve 122 by 10% in a single step with an interval of 10 seconds until the opening drops to 0%, allowing the screw to resume its operating speed and returning to the current displacement no-load test state. S5. Dynamic torque, speed and static torque test under different displacements: Control the fracturing pump skid to gradually reduce the displacement by 100L / min at a time, and repeat steps S3-S4 one by one to measure the dynamic torque, speed and static torque under different displacements and loads until the displacement is reduced to 0, thus completing the screw motor performance test.

[0040] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A screw motor torque and speed testing system, characterized in that: The device includes a screw motor torque and speed testing device (1), a fracturing pump skid (2), a water tank (3), and a PLC controller (4). The inlet of the fracturing pump skid (2) is connected to the water tank (3), the outlet of the fracturing pump skid (2) is connected to the inlet of the screw motor torque and speed testing device (1), and the outlet of the screw motor torque and speed testing device (1) is connected to the water tank (3). The screw motor torque and speed testing device (1) includes a testing unit (11), a power unit (12), and a cooling system (13). The testing unit (11) includes a main shaft (111) and a disc brake (112). The main shaft (111) is a hollow cylindrical structure. The disc brake (112) is sleeved on the outside of the main shaft (111). Both ends of the main shaft (111) extend through the disc brake (112) to the outside of the disc brake (112). The power unit (12) and the cooling system (13) are respectively connected to the disc brake (112). The screw motor torque and speed testing device (1) also includes a tension and compression sensor (113) for monitoring the torque of the disc brake (112) and a speed sensor (114) for monitoring the speed of the main shaft (111). The PLC controller (4) is electrically connected to the speed sensor (114), the tension and compression sensor, the fracturing pump skid (2), the disc brake (112), the power unit (12), and the cooling system (13).

2. The screw motor torque and speed testing system according to claim 1, characterized in that: The tension / compression sensor (113) is connected to the disc brake (112) via the lever arm flange (115), and the speed sensor (114) is mounted on the lever arm flange (115).

3. The screw motor torque and speed testing system according to claim 1, characterized in that: The top of the main shaft (111) is provided with a flange joint (116) for connection with a screw motor.

4. The screw motor torque and speed testing system according to claim 1, characterized in that: The screw motor torque and speed testing device (1) also includes a skid (117), which is a frame structure. The testing unit (11), power unit (12) and cooling system (13) are located inside the skid (117).

5. The screw motor torque and speed testing system according to claim 4, characterized in that: The top of the pry bar (117) is provided with a screw motor clamp (118) for holding the screw motor at a position corresponding to the main shaft (111). The screw motor clamp (118) is rotatably engaged with the screw motor.

6. The screw motor torque and speed testing system according to claim 1, characterized in that: The power unit (12) includes an air compressor (121), which is connected to the air inlet of the disc brake (112) via an air pipe. The air inlet of the disc brake (112) is equipped with a proportional solenoid valve (122), which is electrically connected to the PLC controller.

7. The screw motor torque and speed testing system according to claim 1, characterized in that: The cooling unit includes a water pump (131) and a water tank (132). The outlet of the water tank (132) is connected to the inlet of the disc brake (112) through the water pump (131), and the outlet of the disc brake (112) is connected to the inlet of the water tank (132).

8. The screw motor torque and speed testing system according to claim 1, characterized in that: The screw motor torque and speed testing device (1) also includes a cooling water temperature sensor, a cooling water level sensor and a cooling water pressure sensor, which are electrically connected to the PLC controller (4).

9. The screw motor torque and speed testing system according to claim 8, characterized in that: The cooling water temperature sensor and cooling water level sensor are installed inside the cooling water tank (132), and the cooling water pressure sensor is installed at the outlet of the disc brake (112).

10. A method for testing the torque and speed of a screw motor, characterized in that: The screw motor torque and speed test system according to any one of claims 1-9 is used to complete the screw motor torque and speed test, which includes the following steps: S1, Test process connection: Connect the screw motor to the main shaft (111) through the flange, and clamp the screw motor with the screw motor clamp (118). Connect the fracturing pump skid (2) to the top of the screw motor. S2, Dynamic no-load speed test: Set the opening of the proportional solenoid valve (122) of the disc brake (112) to 0%, and the PLC controller (4) adjusts the injection and discharge rate of the fracturing pump skid from 100L / min to 500L / min by controlling the fracturing pump skid. Each time the discharge rate is increased by 100L / min and the time interval is 1min. Record the speed under different discharge rates and measure the no-load speed of the screw motor. S3, Dynamic torque and speed test: When the injection displacement reaches 500L / min, the PLC controller (4) controls the disc brake (112) to clamp the control valve and adjust the opening of the proportional solenoid valve (122) of the disc brake (112) from 0% to gradually increase. The proportional solenoid valve (122) increases the opening by 5% in a single step, with a time interval of 30s, until the screw motor stops. The speed and torque under different loads at the current displacement are recorded respectively. S4. Static torque test: After the motor stops, gradually reduce the opening of the proportional solenoid valve (122). The proportional solenoid valve (122) is reduced by 1% in a single step until the screw motor restarts. Record the critical torque of the screw motor and the opening of the proportional solenoid valve (122). After the screw motor rotates, gradually reduce the opening of the proportional solenoid valve (122). The opening is reduced by 10% in a single step with an interval of 10 seconds until the opening drops to 0%, so that the screw can resume its working speed and the current displacement no-load test state can be restored. S5. Dynamic torque, speed and static torque test under different displacements: Control the fracturing pump skid to gradually reduce the displacement by 100L / min at a time, and repeat steps S3-S4 one by one to measure the dynamic torque, speed and static torque under different displacements and loads until the displacement is reduced to 0, thus completing the screw motor performance test.

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