Hydraulic motor test system based on automatic gear shifting technology

Abstract

The invention relates to the technical field of hydraulic equipment testing, in particular to a hydraulic motor testing system based on the automatic gear shifting technology, all tests can be completed through one testing table or one rack, the cost is reduced, the hydraulic motor testing system comprises the testing table or the rack, and loaders with different reduction ratios are installed on the testing table or the rack. Each loader is connected with an output end of a gear box through an independent clutch, gears with different reduction ratios and a servo motor are arranged in the gear box, and an input end of the gear box is connected with a tested motor through a torque sensor; during testing, the test pressure, the test flow and the displacement of the tested motor are input to the control system, the control system estimates the torque and the rotating speed of the tested motor, and in combination with the torque ranges and the rotating speed ranges of different loaders, the corresponding servo motor is controlled to rotate to select a proper reduction ratio, and the corresponding clutch is controlled to be closed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment testing, in particular to a testing system for a hydraulic motor based on automatic shifting technology. Background Art

[0002] After the hydraulic motor is produced, its performance needs to be tested. Generally, a test bench with 2 or more loading powers or a test bench with 2 or more loading powers is used. That is, when the speed is high and the load is small, a test bench with a smaller loading power or a test bench with a smaller loading power is used for testing; when the speed is low and the load is large, a test bench with a larger loading power or a test bench with a larger loading power is used for testing, which increases the testing cost. In addition, during the testing process, the hydraulic motor needs to be clamped multiple times, which increases the labor intensity of the operator and reduces the testing efficiency. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a hydraulic motor testing system based on automatic shifting technology, which can complete all tests through one test bench or one test stand, thereby reducing costs.

[0004] The technical solution is as follows: a test system for a hydraulic motor based on automatic shifting technology, characterized in that it includes a test bench or a test stand, on which loaders with different reduction ratios are installed, each of the loaders is connected to an output end of the gearbox through a separate clutch, and the gearbox is provided with gears and servo motors with different reduction ratios, and the input end of the gearbox is connected to the motor under test through a torque sensor; during the test, the test pressure, test flow and displacement of the motor under test are input to the control system, the control system estimates the torque and speed of the motor under test, and controls the rotation of the corresponding servo motor to select the appropriate reduction ratio and control the engagement of the corresponding clutch in combination with the torque range and speed range of different loaders.

[0005] It is further characterized in that the control system estimates the torque and speed of the motor under test by estimating the speed n of the motor under test according to Formula 1: n=q / V*1000*0.8, where q is the experimental flow rate and V is the displacement of the motor under test; and at the same time, the torque T of the motor under test is estimated according to Formula 2: T=deltaP*V / 6.28 / 10*0.7, where deltaP is the test pressure and V is the displacement of the motor under test.

[0006] When all servo motors return to the middle position and the gearbox is in the neutral position, the motor under test can be tested under no-load conditions.

[0007] After adopting the present invention, multiple different loaders are set up, and with different reduction ratios in the gear box, more reduction ratios can be obtained after combination, thereby realizing the test of all displacement motors and all flow rates and pressure points, which only requires one clamping, and the gear box automatically shifts, which reduces the labor intensity of the operator and improves the test efficiency. It does not require multiple test benches or multiple test stands, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the system of the present invention; Figure 2 It is a schematic diagram of the total reduction ratio after combination; Figure 3 Schematic diagram of the six speed ranges set for the system; Figure 4 Schematic diagram of the six torque ranges set for the system; Figure 5 It is the system control comparison table. DETAILED DESCRIPTION

[0009] See Figure 1 As shown, a test system for a hydraulic motor based on automatic shifting technology includes a test bench or test bench, on which loaders with different reduction ratios are installed. This embodiment takes two as an example, including loader 1 and loader 2, which have fixed reduction ratios of 1:3 and 1:2 respectively. Loader 1 is connected to one output end of a gearbox 9 through clutch 1 3, and loader 2 is connected to the other output end of the gearbox 9 through clutch 2 4. The gearbox 9 is provided with four gears with different reduction ratios, servo motor 1 5, and servo motor 2 6. Different gears are controlled by servo motor 1 5 and servo motor 2 6. The input end of the gearbox 9 is connected to the motor under test 8 through a torque sensor 7.

[0010] The speed of the branch where loader 1 is located is higher and the loading torque is smaller. By combining it with the reduction ratio on the gearbox 9, different reduction ratios can be obtained. The speed of the branch where loader 2 is located is lower and the loading torque is larger. By combining it with the reduction ratio on the gearbox 9, different reduction ratios can be obtained. The total reduction after combination is as follows: Figure 2 shown.

[0011] During the test, the test pressure, test flow and displacement of the motor under test are input into the control system. The control system estimates the torque and speed of the motor under test, and controls the rotation of the corresponding servo motor to select the appropriate reduction ratio and control the engagement of the corresponding clutch based on the torque range and speed range of different loaders.

[0012] The process of the control system estimating the torque and speed of the motor under test is as follows: According to Formula 1: n=q / V*1000*0.8, the speed n of the motor under test is estimated, where q is the experimental flow rate and V is the displacement of the motor under test. At the same time, according to Formula 2: T=deltaP*V / 6.28 / 10*0.7, the torque T of the motor under test is estimated, where deltaP is the test pressure and V is the displacement of the motor under test.

[0013] See Figure 3 As shown, the estimated speed and torque are compared with the pre-set ranges to find out which range the estimated speed and torque fall within, and the search results are marked, with Y marking those within the range and N marking those outside the range. Only six of these cases are shown in this embodiment.

[0014] If either the speed or torque is out of range, the search result will be discarded. Only when both the speed and torque are within the range will the search result be adopted. Based on the search result within this range, the corresponding reduction ratio, clutch and loader will be searched. There are 6 results in total, see Figure 4 As shown, B17 is clutch 2 4, B18 is clutch 1 3, B20 is loader 2 2, and B21 is loader 1.

[0015] See Figure 5 As shown in FIG, a comparison table of total reduction ratios corresponding to speed ranges and torque ranges is given. According to the table above, the test program automatically controls servo motor 1 5 or servo motor 2 6 to select the corresponding reduction ratio to meet the test requirements of different points or different displacements.

[0016] In the present invention, two loaders of different loading powers are used, and the appropriate loader is selected through a clutch at the front end of the loader; a gear box is provided at the front end of the clutch, and the gear box has multiple gears, which can be used to match the test of motors with different displacements or different pressures and flows; the gears of the gear box are automatically shifted by a servo motor, which reduces the labor intensity of the operator and improves the test efficiency.

[0017] When all servo motors return to the middle position and the gearbox is in the neutral position, the motor is in the no-load condition. At this time, the corresponding no-load condition test can be performed.

Claims

1. A hydraulic motor test system based on automatic shifting technology, characterized in that: It includes a test bench or a test bench, on which loaders with different reduction ratios are installed. Each loader is connected to an output end of a gear box through a separate clutch. The gear box is provided with gears and servo motors with different reduction ratios. The input end of the gear box is connected to the motor under test through a torque sensor. During the test, the test pressure, test flow and displacement of the motor under test are input to the control system. The control system estimates the torque and speed of the motor under test, and controls the rotation of the corresponding servo motor to select a suitable reduction ratio and control the engagement of the corresponding clutch in combination with the torque range and speed range of different loaders.

2. A hydraulic motor testing system based on automatic shifting technology according to claim 1, characterized in that: The process of the control system estimating the torque and speed of the motor under test is as follows: According to Formula 1: n=q / V*1000*0.8, the speed n of the motor under test is estimated, where q is the experimental flow rate and V is the displacement of the motor under test. At the same time, according to Formula 2: T=deltaP*V / 6.28 / 10*0.7, the torque T of the motor under test is estimated, where deltaP is the test pressure and V is the displacement of the motor under test.

3. The hydraulic motor test system based on automatic shifting technology according to claim 1, characterized in that: When all servo motors return to the middle position and the gearbox is in the neutral position, the motor under test can be tested under no-load conditions.

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