Self-adaptive adjustment multifunctional gear pump test system

Abstract

According to the self-adaptive adjustment multifunctional gear pump test system, a hydraulic and control unit is sealed in a sound insulation box body and is connected with a computer through a communication line, a tester can remotely control a test bed to operate through the computer, and the influence of test noise on the health of the tester is avoided; the test efficiency is improved by controlling test record data through a computer, meanwhile, the test data can be measured in real time, the test bench can also measure the axial force and the radial force of the gear pump, the volumetric efficiency of two gear pumps can be tested at the same time, and the product production test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic gear pump performance detection, in particular to a self-adaptive adjustment multifunctional gear pump testing system. Background Art

[0002] Performance tests are required in the development and production process of gear pumps to ensure that the performance of gear pumps is reliable and stable. Most of the existing gear pump test systems use manual adjustment of load pressure, motor speed, oil temperature, etc., and the test efficiency is low. The heat generated during the high-pressure and high-speed test of the gear pump will increase the oil temperature. The test personnel need to manually use water cooling and other methods to adjust the oil temperature based on experience, and the temperature deviation is large. The efficiency of test personnel manually recording data such as flow, pressure, and temperature of the gear pump is relatively slow, and it is easy to make mistakes when there are a lot of data when conducting a large number of tests. At the same time, according to the requirements of the national industry standard JB / T 7041.2-2020, the performance test of the gear pump includes low-temperature performance, high-temperature performance test, volumetric efficiency test, overspeed performance and durability test. The low-temperature performance test temperature needs to be -25 to -20℃. The existing test bench cannot meet the low-temperature performance test requirements through water cooling, air cooling, etc., and can only complete room temperature and high-temperature tests. The low-temperature test needs to be completed in the northern region with lower temperatures, while the high-temperature test usually uses a high-speed and high-pressure working condition to operate the gear pump to heat the oil, which takes a long time. For research purposes, it is also necessary to test the axial force and radial force of the gear pump to evaluate the deviation between the theoretical calculation results and the experimental results. Traditional test benches are rarely able to test the axial force and radial force of the gear pump.

[0003] The standard also requires that when the test pressure is ≥10MPa, the noise value of the gear pump with a nominal displacement of >100ml / r should be ≤90dB, which is higher than the national recommended national standard GB / T 17249.1-1998, which recommends that the noise in industrial workplaces should be 65-70dB. However, the test noise is usually higher under high load conditions. The test personnel manually operate the test bench and need to stay in the noisy environment for a long time, which affects the health of the test personnel and seriously causes symptoms such as hearing loss and tinnitus. At the same time, manual data recording is also inefficient, prone to errors, and incomplete data. Summary of the invention

[0004] The object of the present invention is to provide a self-adaptive multifunctional gear pump testing system to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] 1. The hydraulic oil is heated by direct contact between the heating rod and the hydraulic oil, which increases the temperature rise rate of the hydraulic oil and saves high temperature test time;

[0008] 2. The sub-zero oil temperature environment test can be achieved by adjusting the operation of the refrigerator to meet the test requirements;

[0009] 3. Use the temperature sensor to monitor the oil temperature at the oil inlet of the gear pump in real time, adjust the operation of the refrigerator in real time, and adjust the oil temperature adaptively to ensure that the test process works at the same oil temperature;

[0010] 4. Monitor the hydraulic system pressure in real time through the pressure sensor, adjust the system pressure in real time to ensure stable pressure during the test process;

[0011] 5. Two sets of hydraulic and control units have two modes. In mode 1, the electronically controlled one-way valve is closed and the gear pump can be tested independently. In mode 2, the electronically controlled one-way valve is opened and the axial force test of the gear pump can be performed.

[0012] 6. The first hydraulic system provides hydraulic pressure to the plunger of the rear end cover of the tested pump, and the axial force of the gear pump can be more accurately tested based on the pressure of the first hydraulic system and the plunger area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A hydraulic principle diagram of a self-adaptive adjustment multifunctional gear pump test system according to an embodiment of the present invention;

[0014] Figure 2 A control principle diagram of a self-adaptive adjustment multifunctional gear pump test system according to an embodiment of the present invention;

[0015] Figure 3 A cross-sectional view of a gear pump according to an embodiment of the present invention;

[0016] Figure 4 It is a schematic diagram of the rear end cover of a normal test gear pump according to an embodiment of the present invention;

[0017] Figure 5 Schematic diagram of the rear end cover of a gear pump for axial force testing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5 , the present invention provides a technical solution: Figure 1As shown, a hydraulic principle diagram of a self-adaptive adjustment multifunctional gear pump test system of this embodiment includes a hydraulic unit 1 and a hydraulic unit 2 2.

[0020] When the electric one-way valve 112 is closed, the hydraulic and control unit 1 and the hydraulic and control unit 2 are independent of each other, and two gear pumps can be tested at the same time. The filter 102 is on the oil inlet side of the test gear pump 105 to filter impurities in the hydraulic oil. The refrigerator 103 is installed behind the filter 102 to cool the hydraulic oil. The temperature sensor 104 is installed behind the refrigerator 103 to measure the temperature of the cooled hydraulic oil. The torque sensor 106 is installed between the servo motor 107 and the test gear pump 105 to measure the torque of the test gear pump 105 when it is running. The flow meter 108 is installed on the oil outlet pipe of the test gear pump 105. On the road, the flow rate of the test gear pump 105 is measured when it is working. The three-position four-way solenoid reversing valve 109 is installed on one side of the oil outlet of the flowmeter 108. When the no-load test is carried out, the three-position four-way solenoid reversing valve 109P port and B port are connected, and the hydraulic oil directly returns to the oil tank 101. When the loading test is carried out, the three-position four-way solenoid reversing valve 109P port and A port are connected. At this time, the hydraulic oil returns to the oil tank 101 through the electro-hydraulic proportional pilot relief valve 111. At this time, the system pressure can be adjusted through the electro-hydraulic proportional pilot relief valve 111.

[0021] Similarly, the filter 202 is located at the oil inlet side of the test gear pump 205 to filter impurities in the hydraulic oil. The refrigerator 203 is installed behind the filter 202 to cool the hydraulic oil. The temperature sensor 204 is installed behind the refrigerator 203 to measure the temperature of the cooled hydraulic oil. The torque sensor 206 is installed between the servo motor 207 and the test gear pump 205 to measure the torque of the test gear pump 205 when it is running. The flow meter 208 is installed at the oil outlet of the test gear pump 205. On the pipeline, the flow rate of the test gear pump 205 is measured when it is working. The three-position four-way solenoid reversing valve 209 is installed on the side of the oil outlet of the flowmeter 208. When performing a no-load test, the three-position four-way solenoid reversing valve 209P port and B port are connected, and the hydraulic oil directly returns to the oil tank 201. When performing a loading test, the three-position four-way solenoid reversing valve 209P port and A port are connected. At this time, the hydraulic oil returns to the oil tank 201 through the electro-hydraulic proportional pilot relief valve 211. At this time, the system pressure can be adjusted through the electro-hydraulic proportional pilot relief valve 211.

[0022] When the electric-controlled one-way valve 112 is opened, an axial force test can be performed. The hydraulic and control unit 1 provides a load pressure for the plunger hole of the rear end cover of the test gear pump 205. The load pressure can be calculated according to the formula F z =p·π·r 2 , where F zis the axial force, p is the oil pressure recorded by pressure sensor 110, and r is the radius of the plunger at the rear end cover of the gear pump under test.

[0023] like Figure 2 As shown, the control principle diagram of the adaptive adjustment multifunctional gear pump test system of this embodiment includes a control unit 13 and a control unit 24. The control unit 13 is similar to the control unit 24. The control unit 13 adds an electric control check valve 112. The working mode of the control unit 13 is described in detail below. The ADC_Ch1~ADC_Ch4 channels of the control card 114 are respectively connected to the pressure sensor 110, the flow meter 108, the torque sensor 106 and the temperature sensor 104, and the collected pressure, flow, torque and temperature data are transmitted to the computer 5. The Do1 channel of the control card 114 is connected to the current amplifier 120, which amplifies the control card current and controls the electro-hydraulic proportional pilot relief valve 111 to adjust the load pressure; the Do2 channel is connected to the relay 5 119 to control the flow direction of the hydraulic oil of the three-position four-way solenoid reversing valve 109. When the relay 5 119 is powered off, the three-position four-way solenoid reversing valve 109P port and B port are connected, and the hydraulic oil directly returns to the oil tank 101. When the relay 5 119 is powered on, the three-position four-way solenoid reversing valve 109P port and A port are connected. At this time, the hydraulic oil returns to the oil tank 101 through the electro-hydraulic proportional pilot relief valve 111; the Do3 channel is connected to the relay 4 118 to control the electric control check valve 112. When the relay 4 118 is powered off, the electric control check valve 112 is controlled to be closed, and the hydraulic unit 1 and the hydraulic unit 2 are connected. It can be tested independently. When relay four 118 is energized, it controls the electronically controlled one-way valve 112 to open. Hydraulic unit one 1 and hydraulic unit two 2 can carry out axial force test experiment of gear pump two 205. Do4 channel is connected to relay three 117 to control heating rod 113. Relay three 117 is energized before high temperature test. When heating rod 113 works until oil temperature reaches specified temperature, relay three 117 is de-energized. Do5 channel is connected to relay two 116 to control refrigerator one 103. Relay two 116 is energized before low temperature test. When refrigerator one 103 works until oil temperature reaches specified temperature, relay two 116 is de-energized. Do6 channel is connected to relay one 115 to enable control of servo motor one 107. Timer TIM is connected to driver one 121 to adjust the speed of servo motor one 107.

[0024] like Figure 3 As shown, it is a cross-sectional view of the gear pump 105 under test, including the rear end cover 6, the large plunger 604, the small plunger 606, the driving wheel 9 and the driven wheel 8. The large plunger 604 and the small plunger 606 can balance the axial forces of the driving wheel 9 and the driven wheel 8 respectively.

[0025] like Figure 4As shown, the rear end cover 6 of the tested gear pump 105 includes a high-pressure oil groove 601, a driving wheel plunger hole 602, a driven wheel plunger hole 603, a large plunger 604, and a high-pressure oil channel 605. When the test gear pump 105 is tested, the loaded high-pressure oil flows from the high-pressure oil groove 601 through the high-pressure oil channel 605 to act on the large plunger 604 in the driving wheel plunger hole 602. The large plunger 604 moves upward under the action of the loaded high-pressure oil to support the gear shaft, thereby balancing the axial force of the gear.

[0026] like Figure 5 As shown, the rear end cover 27 of the tested gear pump 205 of this embodiment includes a driving wheel plunger hole 2701, a driven wheel plunger hole 2702, and a large plunger 2703. When the axial force test of the gear pump 205 is performed, the hydraulic unit 1 slowly increases the pressure from low to high to provide high-pressure oil to enter the driving wheel plunger hole 2701 to act on the large plunger 2703. The large plunger 2703 moves upward under the action of the high-pressure oil under the load to support the gear shaft and balance the axial force of the gear.

[0027] The following is a detailed description of the working principle and method of an adaptive adjustment multifunctional gear pump test system in this embodiment:

[0028] Embodiment 1, testing various performances of the gear pump under different temperature and pressure conditions: such as the volumetric efficiency, pressure pulsation, radial force and other performances of the gear pump under 60°C oil temperature, motor speed 2000rpm, and 20MPa load pressure. Since the axial force test is not involved, only the hydraulic unit 1 and the control unit 3 are used for experimental description. The computer 5 controls the relay 4 118 to cut off the power, the electric control check valve 112 is closed, the hydraulic unit 1 and the hydraulic unit 2 2 work independently, the computer 5 controls the relay 3 117 to energize, the heating rod 113 works, the computer 5 controls the relay 5 119 to cut off the power, the three-position four-way electromagnetic reversing valve 109 P port and B port are connected, the hydraulic oil directly returns to the oil tank 101, and the control relay 115 is energized at the same time, and the driver 121 is connected through the timer TIM to control the servo motor 107 to adjust the speed, and gradually increase to 1000rpm, to accelerate the heat conduction and heat convection of the hydraulic oil in the oil tank to prevent the oil temperature in the oil tank from being uneven. At the same time, the control card 114 collects the oil temperature data measured by the temperature sensor 104 in real time and transmits it to the computer 5. When the oil temperature reaches 60°C, the computer 5 controls the relay 3 117 to cut off the power, and the heating rod 113 stops working. The computer 5 continues to connect the driver 121 through the timer TIM to control the servo motor 107 to adjust the speed, step by step to 2000rpm. The computer 5 controls the relay 5 119 to energize, and the three-position four-way electromagnetic reversing valve 109P port and A port are connected. The hydraulic oil returns to the oil tank 101 through the electro-hydraulic proportional pilot relief valve 111. The current output by the control card 114 is amplified by the current amplifier 120, and then controls the electro-hydraulic proportional pilot relief valve 111 to adjust the load pressure, and gradually pressurizes it to 20MPa. When the pressure drops after a long test and the pressure is lower than 20MPa, the computer 5 adjusts the pressure adaptively and controls the electro-hydraulic proportional pilot relief valve 111 to make up the pressure to 20MPa. The gear pump of the high-load test will also generate a lot of heat, and the oil temperature will rise. When the temperature measured by the temperature sensor 104 exceeds 60°C, the computer 5 controls the relay 2 116 to energize and adaptively adjust the oil temperature through the control card 114, and the refrigerator 103 works to control the oil temperature to be kept at around 60°C. Then the control card 114 collects the data of the torque sensor 106, flow meter 108, and pressure sensor 110 and transmits them to the computer 5, and displays the data and processed data such as volumetric efficiency and radial force in real time through the host computer software and stores them as excel files.

[0029] Example 2, test the gear axial force of the gear pump 205. The computer 5 controls the relay 4 118 to be powered off, the electric control check valve 112 is closed, the computer 5 controls the relay 9 217 to be powered off, the three-position four-way electromagnetic reversing valve 2 209P port and the B port are connected, and the hydraulic oil directly returns to the oil tank 2 201, and the control relay 6 214 is powered on at the same time, and the driver 2 219 is connected through the timer TIM to control the servo motor 2 207 to adjust the speed, which is gradually increased to 500rpm, the computer 5 controls the relay 9 217 to be powered on, the three-position four-way electromagnetic reversing valve 2 209P port and the A port are connected, and the hydraulic oil returns to the oil tank 2 201 through the electro-hydraulic proportional pilot relief valve 2 211, and the current output by the control card 2 213 is amplified by the current amplifier 218, and then the electro-hydraulic proportional pilot relief valve 2 211 is controlled to adjust the load pressure, and the pressure is gradually increased to 5MPa.

[0030] Then computer 5 controls relay 4 118 to energize, electronically controlled check valve 112 opens, computer 5 controls relay 5 119 to de-energize, three-position four-way solenoid directional valve 109P port is connected to B port, hydraulic oil directly returns to oil tank 101, and at the same time controls relay 115 to energize, connects driver 121 through timer TIM to control servo motor 2 207 to adjust speed, gradually increasing to 500rpm, computer 5 controls relay 5 119 to energize, three-position four-way solenoid directional valve 109P port is connected to A port, hydraulic oil returns to oil tank 101 through electro-hydraulic proportional pilot relief valve 111, and the current output by control card 114 passes through current amplifier 1120 is amplified, and then the electro-hydraulic proportional pilot relief valve 2211 is controlled to adjust the load pressure, and the pressure is slowly increased step by step. At this time, the high-pressure oil provided by the hydraulic unit 1 enters the active wheel plunger hole 2701 to act on the large plunger 2703. The large plunger 2703 moves upward under the action of the high-pressure oil to support the gear shaft. At the same time, the current value of the servo motor 207 is recorded through the driver 219. When the current is the smallest, the power of the motor servo motor 207 is the smallest, indicating that it is only affected by radial force and the axial force of the gear is balanced. At the same time, the value of the pressure sensor 2210 is recorded at this time. The computer 5 processes the value of the pressure sensor 110 and the bottom area of ​​the large plunger 2703 to obtain the axial force of the gear pump.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. An adaptively adjustable multifunctional gear pump test system, comprising a hydraulic and control unit 1, a hydraulic and control unit 2 and a computer (5), characterized in that: The hydraulic and control unit 1 includes a hydraulic unit 1 (1) and a control unit 1 (3), and the hydraulic and control unit 2 includes a hydraulic unit 2 (2) and a control unit 2 (4). The hydraulic and control unit 1 are tested independently, and the hydraulic and control unit 2 jointly tests the axial force of the gear pump. The hydraulic and control unit 1 and the hydraulic and control unit 2 are connected to a computer (5) via a communication line, wherein: The hydraulic unit (1) comprises an oil tank (101), a filter (102), a refrigerator (103), a temperature sensor (104), a test gear pump (105), a torque sensor (106), a servo motor (107), a flow meter (108), a three-position four-way electromagnetic reversing valve (109), a pressure sensor (110), an electro-hydraulic proportional pilot relief valve (111), an electric-controlled check valve (112) and a heating rod (113); The control card 1 (114) of the hydraulic and control unit 1 is connected to the current amplifier 1 (120) through the Do1 channel to control the electro-hydraulic proportional pilot relief valve 1 (111), the Do2 channel is connected to the relay 5 (119) to control the three-position four-way electromagnetic reversing valve (109), the Do3 channel is connected to the relay 4 (118) to control the electric control check valve 1 (112), the Do4 channel is connected to the relay 3 (117) to control the heating rod 1 (113), the Do5 channel is connected to the relay 2 (116) to control the refrigerator 1 (103), the Do6 channel is connected to the relay 1 (115) to enable the motor 1 (107), the timer TIM is connected to the driver 1 (121) to adjust the speed of the motor 1 (107), and the ADC_Ch1 to ADC_Ch4 channels of the control card 1 (114) are respectively connected to the pressure sensor 1 (110), the flow meter 1 (108), the torque sensor 1 (106) and the temperature sensor 1 (104); The filter (101) is installed on one side of the oil inlet of the test gear pump (105), the temperature sensor (104) is installed on one side of the oil inlet of the test gear pump (105), the refrigerator (103) is installed between the oil tank (101) and the oil inlet pipeline of the test gear pump (105), the heating rod (113) is installed on the oil tank (101), and the heating end of the heating rod (113) is completely immersed in the hydraulic oil, the torque sensor (106) is installed between the servo motor (107) and the test gear pump (105), the flow meter (108) is installed on the oil outlet pipeline of the test gear pump (105), and the three-position four-way electromagnetic reversing valve (109) is installed on one side of the oil outlet of the flow meter (108); The hydraulic unit 2 (2) comprises an oil tank 2 (202), a filter 2 (202), a refrigerator 2 (203), a temperature sensor 2 (204), a test gear pump 2 (205), a torque sensor 2 (206), a servo motor 2 (207), a flow meter 2 (208), a three-position four-way electromagnetic reversing valve 2 (209), a pressure sensor 2 (210), an electro-hydraulic proportional pilot relief valve 2 (211), and a heating rod 2 (212); The control card 2 (213) of the hydraulic and control unit 2 is connected to the current amplifier 2 (218) through the Do1 channel to control the electro-hydraulic proportional pilot relief valve 2 (211), the Do2 channel is connected to the relay 9 (217) to control the three-position four-way electromagnetic reversing valve 2 (209), the Do3 channel is connected to the relay 8 (216) to control the heating rod 2 (212), the Do4 channel is connected to the relay 7 (215) to control the refrigerator 2 (203), the Do5 channel is connected to the relay 6 (214) to enable the motor 2 (207), the timer TIM is connected to the driver 2 (219) to adjust the speed of the motor 2 (207), and the ADC_Ch1 to ADC_Ch4 channels of the control card 2 (213) are respectively connected to the pressure sensor 2 (210), the flow meter 2 (208), the torque sensor 2 (206) and the temperature sensor 2 (204); The filter 2 (202) is on the oil inlet side of the test gear pump 2 (205), the refrigerator 2 (203) is installed on the filter 2 (202), the temperature sensor 2 (204) is installed on the oil inlet side of the test gear pump 2 (205), the refrigerator 2 (203) is installed between the oil tank 2 (202) and the oil inlet pipeline of the test gear pump 2 (205), the heating rod 2 (212) is installed on the oil tank 2 (202), and the heating end of the heating rod 2 (212) is completely immersed in the hydraulic oil, the torque sensor 2 (206) is installed between the servo motor 2 (207) and the test gear pump 2 (205), the flow meter 2 (208) is installed on the oil outlet pipeline of the test gear pump 2 (205), and the three-position four-way electromagnetic reversing valve 2 (209) is installed on the oil outlet side of the flow meter 2 (208); The radial force of the test satisfies the formula, F j =T / r b , where F j is the radial force, T is the torque recorded by the torque sensor, r b is the base circle radius of the gear pump gear being tested; The axial force of the test satisfies the formula, F z =p·π·r 2 , where F z is the axial force, p is the oil pressure recorded by the pressure sensor, and r is the radius of the rear end cover plunger of the gear pump under test. A hole is opened at the rear end cover plunger position to connect to the hydraulic unit 1 (1).

2. The self-adaptive multifunctional gear pump test system according to claim 1, characterized in that: The test gear pump (105) comprises a rear end cover (6), a high-pressure oil groove (601), a driving wheel plunger hole (602), a driven wheel plunger hole (603), a large plunger (604), a high-pressure oil channel (605), a small plunger (606), a driving wheel (9) and a driven wheel (8). The large plunger (604) and the small plunger (606) can respectively balance the axial forces of the driving wheel (9) and the driven wheel (8). The high-pressure oil of the load flows from the high-pressure oil groove (601) through the high-pressure oil channel (605) to act on the large plunger (604) in the driving wheel plunger hole (602). The large plunger (604) moves upward under the action of the high-pressure oil of the load to support the gear shaft, thereby balancing the axial force of the gear.

3. The self-adaptive multifunctional gear pump testing system according to claim 1, characterized in that: The test gear pump 2 (205) comprises a rear end cover 2 (7), a driving wheel plunger hole 2 (701), a driven wheel plunger hole 2 (702) and a large plunger 2 (703). When the axial force test of the test gear pump 2 (205) is carried out, the hydraulic unit 1 (1) slowly increases the pressure from low to high to provide high-pressure oil to enter the driving wheel plunger hole 2 (701) to act on the large plunger 2 (703). The large plunger 2 (703) moves upward under the action of the high-pressure oil under the load to support the gear shaft and balance the axial force of the gear.

Images