Mechanical pump detection device

Abstract

The utility model discloses a kind of mechanical pump detection devices, by storing lubricating oil in oil tank, and by heater heating after providing the input end, output end and oil pump gear of transmission shaft, and by controller control the temperature of lubricating oil, guarantee the accuracy of test.In installation process, by the base of motor is fixed in motor bearing seat, the input end of transmission shaft is connected with the output end of motor by first oil pump gear, and the output end is connected with the mechanical pump to be tested by second oil pump gear.Motor, transmission shaft integrated installation in motor bearing seat, ensure that the installation of motor and transmission shaft is more convenient, cooperation is more accurate, work is more stable.Test of the above-mentioned device makes mechanical pump be installed before wind power gear box, whether mechanical pump can be judged to have oil leakage, abnormal sound etc.Problems are convenient to solve in advance, concentratedly, guarantee the normal test of gear box, provide detection approach for mechanical pump fault finding, maintenance etc.Save the procurement cost of mechanical pump.

Description

Technical Field

[0001] This utility model relates to the field of mechanical pump testing technology, and in particular to a mechanical pump testing device. Background Technology

[0002] As the wind power operation and maintenance market expands, the maintenance of mechanical pumps is an area that has not yet received sufficient attention when gearboxes are returned to the factory for repair.

[0003] There are a significant number of existing gearboxes requiring repair, with gearboxes containing mechanical pumps accounting for a large proportion and representing a substantial potential value. However, due to the high cost of repairing valve bodies and gear components, only minor repairs of the mechanical pumps are performed to ensure their normal function remains unaffected. Furthermore, current technology lacks a device to verify the success of mechanical pump repairs. Additionally, during pre-shipment testing of wind turbine gearboxes using new mechanical pumps, abnormal noises sometimes occur at the pump location, directly resulting in the gearbox occupying considerable time and equipment resources on the testing platform.

[0004] Therefore, there is an urgent need for a device to test mechanical pumps, which can detect the performance of mechanical pumps in advance, so as to accurately determine the location of the fault and facilitate timely maintenance. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical pump testing device, which provides a testing method for troubleshooting and repairing mechanical pumps, saves the procurement cost of mechanical pumps, and shortens the entire installation and testing cycle of the gearbox.

[0006] To solve the above-mentioned technical problems, this utility model provides a mechanical pump testing device, comprising:

[0007] An oil tank stores lubricating oil for lubrication.

[0008] A heater is provided in the oil tank for heating the lubricating oil stored in the oil tank;

[0009] An electric motor and a motor bearing housing, wherein the base of the electric motor is fixed to the motor bearing housing for providing power;

[0010] A drive shaft is provided, the input end of which is connected to the output end of the motor via a first oil pump gear to obtain power from the motor. The output end of the drive shaft is provided with a second oil pump gear for meshing with the mechanical pump under test. The oil inlet at the input end and the oil inlet at the output end of the drive shaft are connected to the oil tank. The oil tank provides lubricating oil to the input end of the drive shaft and the first oil pump gear through the oil inlet at the input end, and provides lubricating oil to the output end of the drive shaft and the second oil pump gear through the oil inlet at the output end.

[0011] The controller, connected to the motor, the heater, and the oil tank, is used to control the start and stop of the motor, control the heating power of the heater, and control the oil pressure of the oil tank supplying lubricating oil to the drive shaft.

[0012] It also includes a temperature sensor installed in the oil tank for detecting the temperature of the lubricating oil in the oil tank. The temperature sensor is connected to the controller and is used to feed the temperature value back to the controller.

[0013] It also includes oil pressure detectors installed at the input and output ends of the oil tank, used to detect the output oil pressure output to the drive shaft and the return oil pressure returning from the drive shaft to the oil tank. The oil pressure detectors are connected to the controller and used to feed back the output oil pressure and the return oil pressure to the controller.

[0014] It also includes a display connected to the oil pressure detector, the temperature sensor, and the controller, for displaying the current output oil pressure, the return oil pressure, the temperature value, and the current test status.

[0015] It also includes an end cover disposed on the motor bearing housing, the end cover having a mounting hole through which the mechanical pump under test meshes with the second oil pump gear.

[0016] It also includes a protective cover installed on the motor bearing housing, which is used to shield the connection between the output end of the motor and the drive shaft.

[0017] It also includes an input bearing disposed at the input end of the transmission shaft, an output bearing disposed at the output end of the transmission shaft, and a skeleton oil seal disposed at the input bearing and the output bearing, the skeleton oil seal being used to achieve end face sealing of the transmission shaft.

[0018] It also includes a first oil inlet ring connected to the input bearing and a second oil inlet ring connected to the output bearing. The first oil inlet ring and the second oil inlet ring are connected to the oil tank through an oil pipe assembly. A ball valve for adjusting the oil circuit pressure is provided on the pipeline of the oil pipe assembly.

[0019] It also includes a first shaft retaining ring for fixing the input bearing and the first oil inlet ring, and a second shaft retaining ring for fixing the output bearing and the second oil inlet ring; the input bearing and the output bearing are deep groove ball bearings.

[0020] It also includes an oil tank seat located at the bottom of the motor bearing housing, the oil tank seat being used to support the motor bearing housing, and the oil tank and the heater being located inside the oil tank seat.

[0021] The mechanical pump testing device provided in this embodiment of the invention has the following advantages compared with the prior art:

[0022] The mechanical pump testing device provided in this embodiment of the invention stores lubricating oil in an oil tank, heats it with a heater, and then supplies it to the input and output ends of a drive shaft. During installation, the motor base is fixed to the motor bearing housing. The input end of the drive shaft is connected to the output end of the motor via a first oil pump gear, and the output end is connected to the mechanical pump under test via a second oil pump gear. The temperature of the lubricating oil is controlled by a controller to ensure the accuracy of the test. The motor and drive shaft are integrated and installed in the motor bearing housing, ensuring more convenient installation, more precise coordination, and more stable operation. The above test allows the mechanical pump, installed before the wind turbine gearbox, to determine whether there are problems such as oil leakage or abnormal noise in the mechanical pump, facilitating early and centralized resolution, ensuring normal testing of the gearbox, providing a detection method for fault finding and maintenance of the mechanical pump, saving the purchase cost of the mechanical pump, and shortening the entire installation and testing cycle of the gearbox. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A front view structural schematic diagram of an embodiment of the mechanical pump testing device provided by this utility model;

[0025] Figure 2 A top view schematic diagram of an embodiment of the mechanical pump testing device provided by this utility model;

[0026] Among them, the components are: oil tank base-1, heater-2, motor bearing housing-3, motor-4, protective cover-5, drive shaft-6, skeleton oil seal-7, first shaft retaining ring-8, input bearing-9, first oil inlet ring-10, pressure plate-11, cover plate-12, second oil inlet ring-13, output bearing-14, second shaft retaining ring-15, second oil pump gear-16, end cover-17, oil pump pinion-18, mechanical pump under test-19, digital display temperature sensor-20, pressure gauge-21, and oil pipe assembly-22. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1-2 , Figure 1 A front view structural schematic diagram of an embodiment of the mechanical pump testing device provided by this utility model; Figure 2 This is a top view structural schematic diagram of an embodiment of the mechanical pump testing device provided by this utility model.

[0029] In one specific embodiment, the mechanical pump detection device includes:

[0030] An oil tank stores lubricating oil for lubrication.

[0031] Heater 2 is installed in the oil tank for heating the lubricating oil stored in the oil tank;

[0032] The motor 4 and the motor bearing housing 3 are provided with a base fixed to the motor bearing housing 3 for providing power.

[0033] A drive shaft 6 has its input end connected to the output end of the motor 4 via a first oil pump gear, for obtaining power from the motor 4. The output end of the drive shaft 6 is provided with a second oil pump gear 16 for meshing with the mechanical pump 19 under test. The oil inlet at the input end and the oil inlet at the output end of the drive shaft 6 are connected to the oil tank. The oil tank provides lubricating oil to the input end of the drive shaft 6 and the first oil pump gear through the oil inlet at the input end, and to the output end of the drive shaft 6 and the second oil pump gear 16 through the oil inlet at the output end.

[0034] The controller is connected to the motor 4, the heater 2, and the oil tank, and is used to control the start and stop of the motor 4, control the heating power of the heater 2, and control the oil pressure of the oil tank to provide lubricating oil to the drive shaft 6.

[0035] Lubricating oil is stored in an oil tank and heated by a heater 2 before being supplied to the input bearing 9 and output bearing 14 of the drive shaft 6. During installation, the base of the motor 4 is fixed to the motor bearing housing 3. The input end of the drive shaft 6 is connected to the output end of the motor 4 via a first oil pump gear, and the output end is connected to the mechanical pump 19 under test via a second oil pump gear 16. The temperature of the lubricating oil is controlled by a controller to ensure the accuracy of the test. The motor 4 and drive shaft 6 are integrated and installed in the motor bearing housing 3, ensuring that the installation of the motor 4 and drive shaft 6 is more convenient, the fit is more precise, and the operation is more stable. The above test allows the mechanical pump to be installed in front of the wind turbine gearbox, which can determine whether there are problems such as oil leakage or abnormal noise in the mechanical pump, so as to facilitate early and centralized solutions, ensure the normal testing of the gearbox, provide a detection method for fault finding and maintenance of the mechanical pump, save the purchase cost of the mechanical pump, and shorten the entire installation and testing cycle of the gearbox.

[0036] To further achieve precise control over the testing process and ensure that the bearing of the transmission shaft 6 remains within a stable temperature range during the testing process to guarantee good lubrication, in one embodiment, the mechanical pump detection device further includes a temperature sensor installed in the oil tank to detect the temperature value of the lubricating oil in the oil tank. The temperature sensor is connected to the controller and is used to feed the temperature value back to the controller.

[0037] By installing a temperature sensor in the oil tank, the temperature of the lubricating oil input to the drive shaft 6 can be obtained in real time. This allows for precise control of the lubricating oil temperature during mechanical pump testing, enabling the evaluation of the pump's performance under different lubricating oil temperatures and providing accurate test data for the pump at various temperatures. Furthermore, the temperature of the lubricating oil after lubrication can be detected, and the temperature change before and after lubrication can also reveal the pump's performance.

[0038] This application does not limit the type or setting method of the temperature sensor.

[0039] Since the input and output of different lubricating oils can affect the lubrication process and the test results, in one embodiment, the mechanical pump detection device further includes oil pressure detectors installed at the input and output ends of the oil tank, for detecting the output oil pressure output to the drive shaft 6 and the return oil pressure returning from the drive shaft 6 to the oil tank. The oil pressure detectors are connected to the controller and are used to feed back the output oil pressure and the return oil pressure to the controller.

[0040] By setting up an oil pressure detector to detect the output oil pressure to the drive shaft 6 and the return oil pressure from the drive shaft 6 back to the oil tank, the performance of the mechanical pump under different input oil pressures can be obtained in real time. At the same time, the data can also be obtained by observing the changes in the temperature and oil pressure of the output lubricating oil under the same input oil pressure at different temperatures, thereby improving the accuracy of the test data.

[0041] This application does not limit the type, structure, installation method, or detection method of the oil pressure detector.

[0042] The oil pressure detector is connected to the controller to feed back the output oil pressure and the return oil pressure to the controller. This can be done via wired transmission or wireless transmission.

[0043] To further improve management efficiency during testing, in one embodiment, the mechanical pump detection device further includes a display connected to the oil pressure detector, the temperature sensor, and the controller, for displaying the current output oil pressure, the return oil pressure, the temperature value, and the current test status.

[0044] By connecting to the display, the current output oil pressure, return oil pressure, temperature value, and current test status can be displayed. The staff can obtain the test data in real time and stop the test in time when a fault occurs, thereby reducing the damage to the mechanical pump and test equipment.

[0045] This application does not limit the type or display method of the display. It can be a digital display or a text display, such as displaying that the oil pressure is qualified, the temperature is qualified, or the oil pressure is too high. It can also distinguish and restrict the numbers and text by displaying different colors. For example, the normal oil pressure is displayed in green, and the oil pressure is displayed in red. As the oil pressure continues to rise, the brightness of the red can be increased, the color can be deepened, or even the font size can be increased, or other display methods can be used.

[0046] For example, in one embodiment, the temperature sensor is a digital display type, and the oil pressure detector is a pointer-type mechanical pressure gauge. Operators can choose the appropriate display as needed. During testing, the mechanical pump 19 under test needs to be connected to the oil pump gear 16. In actual use, if exposed for extended periods when not in use, this could lead to oxidation, dust accumulation, and other problems, increasing errors in subsequent tests.

[0047] Therefore, in order to improve testing efficiency and accuracy and reduce the influence of external factors, in one embodiment, the mechanical pump testing device further includes an end cover 17 disposed on the motor bearing housing 3, the end cover 17 being provided with a mounting hole, through which the mechanical pump 19 to be tested meshes with the second oil pump gear 16.

[0048] By setting an end cover 17 on the motor bearing housing 3 and setting a mounting hole on the end cover 17, the mechanical pump 19 to be tested meshes with the second oil pump gear 16 through the mounting hole, so that the above-mentioned problem will only occur during testing. When not testing, the mounting hole can be closed, so that the pump gear is isolated from the outside world, which improves the accuracy of subsequent use and reduces external interference.

[0049] This application does not limit the configuration of the end cap 17 and the mounting hole, and other structures can also be used to connect the mechanical pump 19 to be tested and the second oil pump gear 16.

[0050] To further reduce external interference to the testing device, in one embodiment, the mechanical pump testing device further includes a protective cover 5 disposed on the motor bearing housing, the protective cover 5 being used to shield the connection between the output end of the motor 4 and the transmission shaft 6.

[0051] By installing a protective cover 5 on the motor bearing housing 3 to shield the connection between the output end of the motor 4 and the drive shaft 6, external dust and other contaminants can be prevented from entering the connection and causing interference. This also reduces heat exchange with the outside environment, improving test accuracy. Furthermore, by shielding this area, even in the event of a malfunction, such as the generation of high-speed debris, it will not fly out and injure nearby test personnel, thus improving test safety.

[0052] This application does not impose any restrictions on the material, structure, size, or installation method of the protective cover 5.

[0053] To further reduce resistance during testing and improve the stability of the device testing, in one embodiment, the mechanical pump testing device further includes an input bearing 9 disposed at the input end of the transmission shaft 6, an output bearing 14 disposed at the output end of the transmission shaft 6, and a skeleton oil seal 7 disposed at the input bearing 9 and the output bearing 14, the skeleton oil seal 7 being used to achieve end face sealing of the transmission shaft 6.

[0054] By setting an input bearing 9 at the input end of the transmission shaft 6 and an output bearing 14 at the output end of the transmission shaft 6, the transmission shaft 6 can be fixed by the bearings, improving the fixing efficiency and reliability, and improving the stability during testing. By setting a skeleton oil seal 7, the lubricating oil in the oil tank can be input through the skeleton oil seal 7, ensuring the reliability of lubrication during use.

[0055] This application does not limit the type of input bearing 9, output bearing 14, etc.

[0056] To further improve the management efficiency of the oil circuit, in one embodiment, the mechanical pump detection device further includes a first oil inlet ring 10 connected to the input bearing 9 and a second oil inlet ring 13 connected to the output bearing 14. The first oil inlet ring 10 and the second oil inlet ring 13 are connected to the oil tank through an oil pipe assembly 22, and a ball valve for adjusting the oil circuit pressure is provided on the pipeline of the oil pipe assembly 22.

[0057] By setting up a first oil inlet ring 10 and a second oil inlet ring, and connecting them to the oil tank through an oil pipe assembly 22, the lubricating oil in the oil tank can be supplied to the corresponding bearings through the first oil inlet ring 10 and the second oil inlet ring 13 via the oil pipe assembly 22. Furthermore, the used lubricating oil can be collected for reuse through the oil pipe assembly 22, thereby improving the efficiency of oil circuit management.

[0058] By installing a ball valve on the oil pipe assembly 22 for adjusting the oil pressure, the oil pressure can be adjusted in real time, improving the flexibility of subsequent testing.

[0059] This application does not limit the first oil inlet ring 10, the second oil inlet ring 13, the oil pipe assembly 22, and the ball valve, and other structures can also be used for the input and output of lubricating oil and oil pressure control.

[0060] This application does not limit the type and fixing method of the input bearing 9 and the output bearing 14. In one embodiment, the mechanical pump detection device further includes a first shaft retaining ring 8 for fixing the input bearing 9 and the first oil inlet ring 10, and a second shaft retaining ring 15 for fixing the output bearing 14 and the second oil inlet ring 13. The input bearing 9 and the output bearing 14 are deep groove ball bearings.

[0061] The first shaft retaining ring 8 and the second shaft retaining ring 15 are used to fix their respective bearings and oil inlet rings, which improves the fixing efficiency. At the same time, the installation and disassembly efficiency can be improved during installation and subsequent maintenance. This application does not limit the corresponding shaft retaining ring structure, and other structures can also be used. The corresponding bearings are not limited.

[0062] To further improve space utilization efficiency, in one embodiment, the mechanical pump detection device further includes an oil tank seat 1 disposed at the bottom of the motor bearing seat 3, the oil tank seat 1 being used to support the motor bearing seat 3, and the oil tank and the heater 2 being disposed within the oil tank seat 1.

[0063] In this application, by placing the oil tank seat 1 at the bottom of the motor bearing seat 3, the motor bearing seat is supported by the oil tank seat 1, and the oil tank and heater 2 are placed inside the oil tank seat 1. On the one hand, space can be saved, and on the other hand, a stable platform can be provided for the motor bearing seat 3, thereby improving the installation efficiency of subsequent equipment.

[0064] This application does not limit the material or size of the oil tank seat 1 or the method of fixing the motor bearing seat.

[0065] In one embodiment, the mechanical pump detection device is used to detect the mechanical pump of the wind turbine gearbox, which operates at approximately 1400 r / min, and it is necessary to create a normal operating range for the mechanical pump.

[0066] like Figure 1 As shown, power is transmitted from left to right. Motor 4 is selected to provide power. Its base is fixed on the motor bearing seat 3. The end of the motor is connected to the drive shaft 6. A protective cover 5 is used around the connection to prevent the connection from falling off or flying off during high-speed rotation.

[0067] From left to right, the drive shaft 6 is fitted with a skeleton oil seal 7 to solve the end face sealing problem. A shaft retaining ring 8 secures the input bearing 9. The first oil inlet ring 10 supplies lubricating oil to the input bearing 9, lubricating it; the second oil inlet ring 13 lubricates the output bearing 14; the second shaft retaining ring 15 secures the output bearing 14 and the second oil inlet ring 13. The first oil pump gear 16 and the oil pump pinion 18 are gears of the same specification, with a transmission ratio of 1:1.

[0068] After assembling the drive shaft components, install them from right to left, including the pressure plate 11, which serves to fix the input bearing 9 and the first oil inlet ring 10, and also to secure the entire drive shaft. Next, install the cover plate 12, which has some oil inlet and outlet passages.

[0069] The end cover 17 is mounted on the motor bearing housing 3. The end cover has mounting holes to facilitate the installation of the mechanical pump 19 that needs to be replaced for testing. The mechanical pump has an oil pump pinion 18.

[0070] Finally, the custom-made oil pipe assembly 22 is installed. The oil pipe is equipped with a ball valve to adjust the pressure of the entire oil circuit. The pressure gauge 21 displays the oil circuit pressure at all times, and the digital temperature sensor 20 displays the lubricating oil temperature at all times. Two heaters 2 ensure that the test lubricating oil meets the normal working conditions of the mechanical pump.

[0071] The above-mentioned device ensures that the installation of the motor and drive shaft is more convenient, the fit is more precise, and the operation is more stable; at the same time, the motor bearing housing 3 also serves as the cover plate of the oil tank housing 1, and the oil tank can be easily cleaned by removing the motor bearing housing 3.

[0072] In this application, the oil tank stores all the lubricating oil and reserves the lubricating oil required for testing. Impurity filtration mainly relies on the adsorption of magnets at the bottom. The heater needs to heat the lubricating oil and is manually adjusted via a digital temperature sensor to ensure the oil temperature (the viscosity and pressure of the lubricating oil are affected by temperature, and it is necessary to simulate the actual working conditions). The lubricating oil is internally self-circulating, and after lubricating the entire system, it returns to the oil tank.

[0073] The above-mentioned device has the following beneficial effects:

[0074] The motor mounting area and the drive shaft mounting area are integrated into one unit—the motor bearing housing. This ensures that the installation of the motor and drive shaft is more convenient, the fit is more precise, and the operation is more stable. At the same time, the motor bearing housing also serves as a cover for the oil tank, allowing for easy cleaning of the oil tank by removing the motor bearing housing.

[0075] The drive shaft uses two deep groove ball bearings (input bearing and output bearing), which are simple in structure, easy to limit, low in cost, and convenient for transmitting torque and power from the motor to the oil pump.

[0076] The end cap integrates an oil distributor assembly, which has the function of distributing lubricating oil to various oil passages; at the same time, the reserved oil hole position also facilitates the connection of oil passages.

[0077] The oil pipe assembly, equipped with ball valves, controls the oil flow rate and displays the oil pressure changes via an oil level gauge, making it easy to predict the status of the mechanical pump (whether its suction capacity is weakening).

[0078] The heater and digital temperature sensor ensure that the mechanical pump is always kept in a reasonable and normal operating environment (approximately 45°C).

[0079] In summary, the mechanical pump testing device provided by this utility model stores lubricating oil in an oil tank and heats it with a heater before supplying it to the input and output ends of the drive shaft. During installation, the motor base is fixed to the motor bearing housing, the input end of the drive shaft is connected to the output end of the motor via a first oil pump gear, and the output end is connected to the mechanical pump 19 under test via a second oil pump gear. The temperature of the lubricating oil is controlled by a controller to ensure the accuracy of the test. The motor and drive shaft are integrated and installed in the motor bearing housing, ensuring more convenient installation, more precise coordination, and more stable operation. The above test allows the mechanical pump to be installed in front of the wind turbine gearbox, enabling the determination of whether the mechanical pump has problems such as oil leakage or abnormal noise, facilitating early and centralized resolution, ensuring normal testing of the gearbox, providing a detection method for mechanical pump fault finding and maintenance, saving mechanical pump procurement costs, and shortening the entire gearbox installation and testing cycle.

[0080] The mechanical pump testing device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A mechanical pump testing device, characterized in that, include: An oil tank stores lubricating oil for lubrication. A heater is provided in the oil tank for heating the lubricating oil stored in the oil tank; An electric motor and a motor bearing housing, wherein the base of the electric motor is fixed to the motor bearing housing for providing power; A drive shaft is provided, with its input end connected to the output end of the motor via a first oil pump gear for obtaining power from the motor. The output end of the drive shaft is equipped with a second oil pump gear for meshing with the mechanical pump under test. The input and output oil inlets of the drive shaft are connected to an oil tank. The oil tank provides lubricating oil to the input end of the drive shaft and the first oil pump gear via the input oil inlet, and to the output end of the drive shaft and the second oil pump gear via the output oil inlet. The controller, connected to the motor, the heater, and the oil tank, is used to control the start and stop of the motor, control the heating power of the heater, and control the oil pressure of the oil tank supplying lubricating oil to the drive shaft.

2. The mechanical pump testing device as described in claim 1, characterized in that, It also includes a temperature sensor installed in the oil tank for detecting the temperature of the lubricating oil in the oil tank. The temperature sensor is connected to the controller and is used to feed the temperature value back to the controller.

3. The mechanical pump testing device as described in claim 2, characterized in that, It also includes oil pressure detectors installed at the input and output ends of the oil tank, used to detect the output oil pressure output to the drive shaft and the return oil pressure returning from the drive shaft to the oil tank. The oil pressure detectors are connected to the controller and used to feed back the output oil pressure and the return oil pressure to the controller.

4. The mechanical pump testing device as described in claim 3, characterized in that, It also includes a display connected to the oil pressure detector, the temperature sensor, and the controller, for displaying the current output oil pressure, the return oil pressure, the temperature value, and the current test status.

5. The mechanical pump testing device as described in claim 1, characterized in that, It also includes an end cover disposed on the motor bearing housing, the end cover having a mounting hole through which the mechanical pump under test meshes with the second oil pump gear.

6. The mechanical pump testing device as described in claim 1, characterized in that, It also includes a protective cover disposed on the motor bearing housing, the protective cover being used to shield the connection between the output end of the motor and the drive shaft.

7. The mechanical pump testing device as described in claim 6, characterized in that, It also includes an input bearing disposed at the input end of the drive shaft, an output bearing disposed at the output end of the drive shaft, and a skeleton oil seal disposed at the input bearing and the output bearing, the skeleton oil seal being used to achieve end face sealing of the drive shaft.

8. The mechanical pump testing device as described in claim 7, characterized in that, It also includes a first oil inlet ring connected to the input bearing and a second oil inlet ring connected to the output bearing. The first oil inlet ring and the second oil inlet ring are connected to the oil tank through an oil pipe assembly. A ball valve for adjusting the oil circuit pressure is provided on the pipeline of the oil pipe assembly.

9. The mechanical pump testing device as described in claim 8, characterized in that, It also includes a first shaft retaining ring for fixing the input bearing and the first oil inlet ring, and a second shaft retaining ring for fixing the output bearing and the second oil inlet ring; the input bearing and the output bearing are deep groove ball bearings.

10. The mechanical pump testing device as described in claim 1, characterized in that, It also includes an oil tank seat disposed at the bottom of the motor bearing housing, the oil tank seat being used to support the motor bearing housing, and the oil tank and the heater being disposed within the oil tank seat.

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