Hydraulic motor starting efficiency test device and loading method

Abstract

The invention discloses a hydraulic motor starting efficiency testing device and a loading method. The hydraulic motor starting efficiency testing device comprises a tested motor, a first hydraulic driving assembly, a second hydraulic driving assembly and a swing motor. The first hydraulic driving assembly is connected with the tested motor, the tested motor is connected with the swing motor through the connecting tool, and an output shaft of the tested motor is driven by the first hydraulic driving assembly to rotate in the rotating direction needing to be tested; the second hydraulic driving assembly is directly connected with the swing motor, the output shaft of the swing motor is driven by the second hydraulic driving assembly to rotate to a limit position opposite to the to-be-tested rotation direction of the to-be-tested motor, and liquid is continuously filled into the accommodating cavity so as to maintain enough pressure; when the tested motor rotates, the swing motor is driven to overcome the torque load formed by the volume and pressure of the liquid filling cavity of the swing motor, so that the tested motor is started. According to the scheme, rotation of the output shaft of the tested motor is limited in a hydraulic mode, the torque load is adjusted, the structure is simple, adjustment is convenient, and cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a hydraulic motor starting efficiency test device and a loading method. Background Art

[0002] In the hydraulic motor test, the output shaft of the motor under test needs to be connected to a rotating load. Generally, the output shaft of the motor rotates continuously, so the load is also required to rotate continuously. When loading by hydraulic means, the motor under test drives the hydraulic pump, and different loads are achieved by adjusting the outlet pressure of the hydraulic pump. Since the motor can be used as a pump, a motor of the same specification as the motor under test is generally used as a loading pump (called a loading motor), and the loading pressure is changed by adjusting the outlet pressure of the loading motor.

[0003] In the hydraulic motor starting characteristic test, the starting efficiency test requires that the rotation of the motor shaft be restricted when the motor is started, that is, the output shaft of the motor is restricted by a certain loading torque, and the inlet pressure of the motor is gradually increased until the output torque increases enough to overcome the loading torque. The output shaft can rotate and the various parameters of this process are recorded to measure the starting efficiency of the motor.

[0004] At present, there are usually two ways to adjust the torque of the loading motor:

[0005] (1) Mechanical method: For example, a horizontal arm with adjustable end mass can adjust the torque by changing the length of the lever or the mass of the counterweight. The structure is complex and the adjustment is inconvenient.

[0006] (2) Electrical method. For example, a four-quadrant variable frequency motor can adjust its loading torque under generator working condition. The electrical method is easy to adjust, but the equipment cost is high.

[0007] Mechanical and electrical loading methods sometimes also require the use of a locking device to prevent the loading device from reversing the tested motor, which increases equipment cost and operational complexity.

[0008] Therefore, the existing method for loading the motor under test has technical problems of unchanged adjustment and high cost due to the above technical problems. It can be seen that how to simplify the adjustment method and reduce the cost are problems that need to be solved in this field. Summary of the invention

[0009] In view of the technical problems that the existing methods for loading the test motor have inconvenient adjustment or high equipment cost, the purpose of the present invention is to provide a hydraulic motor starting efficiency test device, which is simpler in structure and more convenient to adjust than the aforementioned mechanical method, and lower in cost than the electrical method. On this basis, a loading method for the hydraulic motor starting efficiency test device is also provided, which effectively overcomes the problems existing in the prior art.

[0010] In order to achieve the above object, the present invention provides a hydraulic motor starting efficiency test device, comprising a tested motor, a first hydraulic drive assembly, a second hydraulic drive assembly, and a swing motor;

[0011] The first hydraulic drive component is externally connected to an oil tank, and an output end is connected to a tested motor. The tested motor is connected to a swing motor via a connecting fixture, and the output shaft of the tested motor is driven by the first hydraulic drive component to rotate in a rotation direction to be tested;

[0012] The second hydraulic drive component is externally connected to an oil tank, and the output ends are directly connected to the swing motors. The swing motors are filled with liquid through the second hydraulic drive component, and the output shaft of the swing motor is driven to rotate to a limit position opposite to the rotation direction of the motor to be tested, and the chamber is continuously filled with liquid to maintain sufficient pressure;

[0013] When the tested motor rotates, it drives the swing motor to overcome the torque load formed by the volume and pressure of the liquid-filled chamber and rotate, that is, the pressure of the liquid-filled chamber of the swing motor is used to control the rotation of the shaft when the tested motor starts.

[0014] Furthermore, the second hydraulic drive component includes a second motor, a second hydraulic pump, a second overflow valve and a second reversing valve. The second motor drives the second hydraulic pump, and the second motor provides kinetic energy to the second hydraulic pump to pump the hydraulic oil in the oil tank into the oil circuit. The second overflow valve is arranged at the output end of the second hydraulic pump, and its output end is connected to the oil tank. The output hydraulic oil can be pressure-regulated by the second overflow valve. The output end of the second reversing valve is connected to the swing motor. The second reversing valve controls the flow direction of the hydraulic oil output by the second hydraulic pump, thereby controlling the rotation direction of the swing motor.

[0015] Furthermore, the second overflow valve is provided with a second pressure sensor, and the second pressure sensor can monitor the pressure of the hydraulic oil output in the oil circuit in real time.

[0016] Furthermore, the first hydraulic drive component includes a first electric motor, a first hydraulic pump, a first overflow valve and a first reversing valve. The first electric motor drives the first hydraulic pump, and the first electric motor provides kinetic energy to the first hydraulic pump to pump the hydraulic oil in the oil tank into the oil circuit. The first overflow valve is arranged at the output end of the first hydraulic pump, and the output hydraulic oil can be pressure-regulated by the first overflow valve; the output end of the first reversing valve is connected to the test motor, and the first reversing valve controls the flow direction of the hydraulic oil output by the first hydraulic pump, thereby controlling the rotation direction of the test motor.

[0017] Furthermore, the first overflow valve is provided with a first pressure sensor, and the pressure of the hydraulic oil output in the oil circuit can be monitored in real time through the first pressure sensor.

[0018] Furthermore, the test motor is equipped with a torque sensor, and the torque of the test motor is detected in real time by the torque sensor.

[0019] Furthermore, the motor under test is equipped with a rotation speed sensor, and the rotation speed of the motor under test is detected in real time by the rotation speed sensor.

[0020] Furthermore, the test motor is equipped with a flow meter for detecting whether oil flows through the test motor, and whether the test motor starts to rotate is comprehensively determined by the flow meter and the speed sensor.

[0021] Furthermore, the inlet and outlet of the tested motor are equipped with pressure sensors for detecting the inlet and outlet pressures.

[0022] In order to achieve the above object, the present invention provides a loading method for a hydraulic motor starting efficiency test device, characterized in that it is implemented based on the hydraulic motor starting efficiency test device, and the loading method comprises the following steps:

[0023] Step 1: Start the second motor to drive the second hydraulic pump;

[0024] Step 2: The second reversing valve is actuated and switched to the first position or the second position, the output flow of the second hydraulic pump supplies oil to the cavity of the swing motor through the second reversing valve, and the output shaft of the swing motor rotates along the first direction to the limit position;

[0025] Step 3: The second motor drives the second hydraulic pump to continuously supply oil, and the pressure in the liquid filling chamber of the swing motor is adjusted through the second relief valve. The pressure and the displacement of the swing motor jointly determine the torque load when the tested motor is started;

[0026] Step 3: Start the first motor to drive the first hydraulic pump;

[0027] Step 4: The first reversing valve is actuated, the output flow of the first hydraulic pump passes through the first reversing valve and enters the tested motor, and the first relief valve is adjusted to gradually increase the driving pressure of the tested motor until the output shaft of the tested motor drives the swing motor to overcome the torque load formed by the volume and pressure of the liquid-filled chamber of the swing motor and generate rotation;

[0028] Step 5: Record the inlet and outlet pressures and output speed of the tested motor during the whole process.

[0029] The hydraulic motor starting efficiency test device and loading method provided by the present invention use hydraulic means to limit the rotation of the output shaft of the tested motor and adjust the size of the torque load. It is simpler in structure and more convenient to adjust than the aforementioned mechanical method, and has lower cost than the electrical method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 This is the principle diagram of the hydraulic motor starting efficiency test device.

[0032] 1. Oil tank 21. First motor 22. First hydraulic pump 23. First relief valve 24. First pressure sensor 25. First reversing valve 26. First check valve 31. Second motor 32. Second hydraulic pump 33. Second relief valve 34. Second pressure sensor 35. Second reversing valve 36. Second check valve 5. Swing motor 6. Flow meter 7. Test motor 8. Speed ​​sensor 9. Torque sensor 10. Connecting tooling. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0034] The existing method of loading the test motor has technical problems such as inconvenient adjustment and high equipment cost due to the use of mechanical and electrical loading methods. To address this technical problem, the present invention provides a hydraulic motor starting efficiency test device, which uses a hydraulic method to load the test motor and adjusts the loading torque by changing the hydraulic pressure. It has a simpler structure and is more convenient to adjust than the aforementioned mechanical method, and has a lower cost than the electrical method.

[0035] The hydraulic motor starting efficiency test device provided by the present invention is shown in FIG. Figure 1 , which includes a first hydraulic drive component, a second hydraulic drive component, a tested motor 7, a connecting tool 10, and a swing motor 5.

[0036] The second hydraulic drive component is externally connected to the oil tank 1, and the output end is connected to the swing motor 5 through the reversing valve. The hydraulic oil in the oil tank is output to the swing motor 5 through the second hydraulic drive component.

[0037] In some embodiments, the second hydraulic drive assembly includes a second motor 31 , a second hydraulic pump 32 , a second overflow valve 33 and a second reversing valve 35 .

[0038] The second motor 31 is driven and connected to the second hydraulic pump 32 , and the second motor 31 provides kinetic energy to the second hydraulic pump 32 , so that the hydraulic oil in the oil tank 1 is pumped into the oil circuit.

[0039] A second one-way valve 36 is provided in the output oil circuit of the second hydraulic pump 32 , and the one-way flow of the oil circuit is ensured by the second one-way valve 36 .

[0040] The second overflow valve 33 is arranged at the output end of the second one-way valve 36 , and the output end thereof is connected to the oil tank 1 . The second overflow valve 33 can be used to adjust the pressure of the hydraulic oil output in the oil circuit.

[0041] The second relief valve 33 is provided with a second pressure sensor 34 , which can monitor the oil circuit pressure adjusted by the second relief valve 33 in real time, thereby ensuring the stability of the hydraulic oil output and further ensuring the safety of the oil circuit.

[0042] The output end of the second reversing valve 35 is connected to the swing motor 5. The second reversing valve 35 is used to control the flow direction of the hydraulic oil output by the second hydraulic pump 32. The hydraulic pressure output by the second hydraulic pump 32 can be supplied to the first cavity or the second cavity of the swing motor 5, thereby controlling the rotation direction of the swing motor 5.

[0043] For example, when the second reversing valve 35 moves to the first direction, the hydraulic oil can flow into the first cavity of the swing motor 5, and the output shaft of the swing motor 5 rotates to the extreme position in the second direction.

[0044] When the second reversing valve 35 moves to the second direction, the hydraulic oil can be supplied to the second cavity of the swing motor 5, and the output shaft of the swing motor 5 rotates to the extreme position in the first direction.

[0045] The first hydraulic drive component is externally connected to the oil tank 1, and the output end is connected to the tested motor 7. The hydraulic oil in the oil tank 1 is output to the tested motor 7 through the first hydraulic drive component to drive the output shaft of the tested motor 7 to rotate.

[0046] In some embodiments, the first hydraulic drive assembly includes a first motor 21 , a first hydraulic pump 22 , a first overflow valve 23 and a first reversing valve 25 .

[0047] The first motor 21 is driven and connected to the first hydraulic pump 22 , and the first motor 21 provides kinetic energy to the first hydraulic pump 22 , so that the hydraulic oil in the oil tank 1 is pumped into the oil circuit.

[0048] A first one-way valve 25 is provided in the output oil circuit of the first hydraulic pump 22 , and the one-way flow of the oil circuit is ensured by the first one-way valve 25 .

[0049] The first overflow valve 23 is disposed at the output end of the first check valve 26 , and the pressure of the hydraulic oil outputted from the oil circuit can be adjusted through the first overflow valve 23 .

[0050] The first relief valve 23 is provided with a first pressure sensor 24 , which can monitor the oil circuit pressure adjusted by the first relief valve 23 in real time, thereby ensuring the stability of the hydraulic oil output and further ensuring the safety of the oil circuit.

[0051] The output end of the first reversing valve 25 is connected to the tested motor 7 . The first reversing valve 25 is used to control the flow direction of the hydraulic oil output by the first hydraulic pump 22 , thereby controlling the rotation direction of the tested motor 7 .

[0052] The output shaft of the test motor 7 is connected to the swing motor 5 through the connecting fixture 10. The rotation direction of the output shaft of the test motor 7 to be tested is opposite to the extreme position of the swing motor 5. The swing motor 5 is used to load a reverse load to it to limit the rotation of the motor shaft when the test motor 7 is started.

[0053] Specifically, the tested motor 7 is provided with a rotation speed sensor 8 and a torque sensor 9, and the rotation speed sensor 8 and the torque sensor 9 are used to detect and record the rotation speed and torque of the tested motor in real time.

[0054] At the same time, the test motor 7 is equipped with a flow meter 6, which adjusts the first overflow valve 23 to gradually increase the input pressure of the test motor 7 until the output shaft of the test motor 7 drives the output shaft of the swing motor 5 to rotate. There is flow output at the outlet of the test motor 7 and it is detected by the flow meter 6. By setting the flow meter 6 and the speed sensor 8, it is comprehensively judged whether the test motor 7 starts to rotate.

[0055] Secondly, pressure sensors (not shown in the figure) are respectively provided at the inlet and outlet of the tested motor 7. The inlet and outlet pressures of the tested motor 7 are detected by the pressure sensors throughout the whole process and the data are recorded.

[0056] It should be noted here that the loading motor in this scheme is a swing motor 5. If an ordinary motor is used as the loading motor, its output shaft is difficult to fix at a certain angle position, and it is also impossible to limit the output shaft of the motor under test, and therefore cannot meet the starting efficiency test requirements. The characteristic of the swing motor is that its shaft swings back and forth, and the angle of rotation is less than 360°, that is, there are 2 rotation limit positions, and it cannot rotate continuously. Therefore, the characteristic of the swing motor with limit positions can be used to limit the output shaft of the motor under test.

[0057] When the swing motor is used as a pump, the output shaft of the motor under test is connected to the output shaft of the swing motor. A certain chamber of the swing motor is filled with liquid, and the output shaft rotates to the corresponding limit position. The chamber is continuously filled with liquid to maintain sufficient pressure to achieve the required loading torque. The output shafts of the tested motor and the swing motor are fixed at this limit position. In order for the tested motor to drive the swing motor shaft to rotate in another direction, it must overcome the torque load formed by the volume and pressure of the liquid-filled chamber at this time. Different loading torques can be achieved by adjusting the pressure of the liquid-filled chamber. Therefore, the use of a swing motor to implement the starting efficiency test has a simple structure, low cost, and convenient loading torque adjustment. There is no need to use an additional locking device, which overcomes the defects of high motor loading cost and unchanged mechanical loading adjustment.

[0058] Based on the hydraulic motor starting efficiency test device constructed by the above scheme, this scheme also provides a loading method for its specific application, and the loading method includes the following steps:

[0059] Step 1: Start the second motor 31 to drive the second hydraulic pump 32;

[0060] Step 2: The second reversing valve 35 is actuated and switched to the first position or the second position. The output flow of the second hydraulic pump 32 passes through the second reversing valve 35 to supply oil to the cavity of the swing motor 5. The output shaft of the swing motor 5 rotates along the first direction to the limit position.

[0061] Step 3: The second motor 31 drives the second hydraulic pump 32 to continuously supply oil, and the pressure in the liquid filling chamber of the swing motor 5 is adjusted through the second relief valve 33. The pressure and the displacement of the swing motor jointly determine the load of the tested motor 7 when starting;

[0062] Step 4: Start the first motor 21 to drive the first hydraulic pump 22;

[0063] Step 5: The first reversing valve 25 is actuated, and the output flow of the first hydraulic pump 22 enters the tested motor 7 through the first reversing valve 25. The first relief valve 23 is adjusted to gradually increase the driving pressure of the tested motor 7 until the output shaft of the tested motor 7 drives the swing motor 5 to rotate by overcoming the torque load formed by the volume and pressure of the chamber;

[0064] Step 6: Record the inlet and outlet pressures and output speed of the tested motor 7 during the whole process.

[0065] The above steps 1-6 are for adjusting the loading torque of the test motor 7 in one direction. The test steps for the other direction of the test motor 7 are the same as the above steps 1-6, except that the output rotation direction of the test motor 7 and the liquid filling chamber of the swing motor 5 are opposite, which will not be described in detail here.

[0066] At the same time, in actual operation, the swing motor 5 can be first connected to the test motor 7, and in the process of rotating to the extreme position, the test motor 7 is driven to rotate together. At this time, the first hydraulic drive component is required to supply low-pressure oil to the test motor 7 to fill it with liquid; it can also be as described in the above steps 1-6, after the swing motor 5 rotates to the extreme position, it is connected to the test motor 7, and the swing motor 5 is driven to rotate by the test motor 7. The specific operating steps are not limited in this scheme and can be determined according to actual conditions.

[0067] The hydraulic motor starting efficiency test device and loading method formed by the above scheme, which adopts a hydraulic method in conjunction with a swing motor to reversely load the test motor, can limit the rotation of the test motor at starting. This scheme adopts a hydraulic method to limit the rotation of the output shaft of the test motor and adjust the size of the torque load. It is simpler in structure and more convenient to adjust than the aforementioned mechanical method, and lower in cost than the electrical method.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic motor starting efficiency test device, comprising a tested motor, characterized in that: It also includes a first hydraulic drive assembly, a second hydraulic drive assembly, and a swing motor; The first hydraulic drive component is externally connected to an oil tank, and an output end is connected to a tested motor. The tested motor is connected to a swing motor via a connecting fixture, and the output shaft of the tested motor is driven by the first hydraulic drive component to rotate in a rotation direction to be tested; The second hydraulic drive component is externally connected to an oil tank, and the output ends are directly connected to the swing motors. The swing motors are filled with liquid through the second hydraulic drive component, and the output shaft of the swing motor is driven to rotate to a limit position opposite to the rotation direction of the motor to be tested, and the chamber is continuously filled with liquid to maintain sufficient pressure; When the tested motor rotates, it drives the swing motor to overcome the torque load formed by the volume and pressure of the liquid-filled chamber and rotate, that is, the pressure of the liquid-filled chamber of the swing motor is used to control the rotation of the shaft when the tested motor starts.

2. A hydraulic motor starting efficiency test device according to claim 1, characterized in that: The second hydraulic drive component includes a second motor, a second hydraulic pump, a second overflow valve and a second reversing valve. The second motor drives the second hydraulic pump, and the second motor provides kinetic energy to the second hydraulic pump to pump the hydraulic oil in the oil tank into the oil circuit. The second overflow valve is arranged at the output end of the second hydraulic pump, and its output end is connected to the oil tank. The output hydraulic oil can be pressure-regulated by the second overflow valve. The output end of the second reversing valve is connected to the swing motor. The second reversing valve controls the flow direction of the hydraulic oil output by the second hydraulic pump, thereby controlling the rotation direction of the swing motor.

3. A hydraulic motor starting efficiency test device according to claim 2, characterized in that: The second overflow valve is provided with a second pressure sensor, and the second pressure sensor can monitor the pressure of the hydraulic oil output in the oil circuit in real time.

4. A hydraulic motor starting efficiency test device according to claim 1, characterized in that: The first hydraulic drive component includes a first motor, a first hydraulic pump, a first overflow valve and a first reversing valve. The first motor drives the first hydraulic pump, and the first motor provides kinetic energy to the first hydraulic pump, so that the hydraulic oil in the oil tank is pumped into the oil circuit. The first overflow valve is arranged at the output end of the first hydraulic pump, and the output hydraulic oil can be pressure-regulated by the first overflow valve. The output end of the first reversing valve is connected to the test motor, and the first reversing valve controls the flow direction of the hydraulic oil output by the first hydraulic pump, thereby controlling the rotation direction of the test motor.

5. A hydraulic motor starting efficiency test device according to claim 4, characterized in that: The first overflow valve is provided with a first pressure sensor, and the pressure of the hydraulic oil output in the oil circuit can be monitored in real time through the first pressure sensor.

6. A hydraulic motor starting efficiency test device according to claim 1, characterized in that: The tested motor is equipped with a torque sensor, and the torque of the tested motor is detected in real time by the torque sensor.

7. A hydraulic motor starting efficiency test device according to claim 6, characterized in that: The tested motor is equipped with a rotation speed sensor, and the rotation speed of the tested motor is detected in real time by the rotation speed sensor.

8. A hydraulic motor starting efficiency test device according to claim 7, characterized in that: The tested motor is equipped with a flow meter for detecting whether oil flows through the tested motor, and the flow meter and the speed sensor are used to comprehensively determine whether the tested motor starts to rotate.

9. A hydraulic motor starting efficiency test device according to claim 8, characterized in that: The inlet and outlet of the tested motor are equipped with pressure sensors for detecting the inlet and outlet pressures.

10. A loading method for a hydraulic motor starting efficiency test device, characterized in that: It is implemented based on the hydraulic motor starting efficiency test device described in claims 1 to 9 above, and the loading method comprises the following steps: Step 1: Start the second motor to drive the second hydraulic pump; Step 2: The second reversing valve is actuated and switched to the first position or the second position, the output flow of the second hydraulic pump supplies oil to the cavity of the swing motor through the second reversing valve, and the output shaft of the swing motor rotates along the first direction to the limit position; Step 3: The second motor drives the second hydraulic pump to continuously supply oil, and the pressure in the liquid filling chamber of the swing motor is adjusted through the second relief valve. The pressure and the displacement of the swing motor jointly determine the torque load when the tested motor is started; Step 3: Start the first motor to drive the first hydraulic pump; Step 4: The first reversing valve is actuated, the output flow of the first hydraulic pump passes through the first reversing valve and enters the tested motor, and the first relief valve is adjusted to gradually increase the driving pressure of the tested motor until the output shaft of the tested motor drives the swing motor to overcome the torque load formed by the volume and pressure of the liquid-filled chamber of the swing motor and generate rotation; Step 5: Record the inlet and outlet pressures and output speed of the tested motor during the whole process.

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