Oil supply system applied to bearing test bed

Abstract

The invention discloses an oil supply system applied to a bearing test bed, relates to an oil supply system, and aims to solve the problems that a single power source of an existing oil supply system of the bearing test bed corresponds to a plurality of oil supply point positions, the oil quantity is difficult to accurately control, the target temperature of the existing bearing test bed is difficult to control, and each branch needs a temperature control unit, so that the cost is low. The oil supply system comprises a temperature control system, a lubricating oil return system, a lubricating oil supply system and a loading device oil supply system, and the temperature control system, the lubricating oil return system, the lubricating oil supply system and the loading device oil supply system of the oil supply system are respectively installed on an oil tank. The oil supply system is communicated with the oil tank through the temperature control system and controls the temperature of working oil in the oil tank, the outlet end of the lubricating oil return system is communicated with the oil tank, the inlet end of the lubricating oil supply system is communicated with the oil tank, and the inlet end of the loading device oil supply system is communicated with the oil tank. The invention is used in the field of oil supply of the bearing test bench.

Description

Technical Field

[0001] The invention relates to an oil supply system, in particular to an oil supply system applied to a bearing test bench. The invention is used in the oil supply field of the bearing test bench. Background Art

[0002] The bearing test bench is often used to test the performance of sliding bearings. Its oil supply system needs to have the following characteristics: 1. Different types of test bearings have different requirements for lubricating oil, and the amount of lubricating oil can differ by hundreds of liters. Therefore, the oil supply and return capacity of the test bearings need to have a wide adjustment range. 2. The oil supply flow and pressure of the test bearings must be accurately controlled. 3. The oil supply temperature of the test bearings must be stable, and the temperature control needs to be accurate.

[0003] However, the existing bearing test bench oil supply system often has a single power source corresponding to multiple oil supply points, which makes it difficult to accurately control the amount of lubricating oil at a certain point, and cannot meet the oil supply flow and pressure requirements of the test bearing, and the flow of a single oil inlet point is difficult to adjust over a large range. In addition, the existing bearing test bench temperature control unit is often directly installed on the oil inlet pipeline. Although the temperature adjustment response is rapid, the oil inlet temperature fluctuates greatly and is not easy to control to the target temperature. For multiple oil inlet branches, each branch requires a temperature control unit, and the structure is cumbersome and complicated. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that a single power source of the existing bearing test bench oil supply system corresponds to multiple oil supply points, it is difficult to accurately control the oil volume, the existing bearing test bench is not easy to control to the target temperature, each branch requires a temperature control unit, and the structure is cumbersome and complicated, and thus to provide an oil supply system applied to the bearing test bench.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] An oil supply system used in a bearing test bench comprises an oil supply system consisting of a temperature control system, a lubricating oil return system, a lubricating oil supply system and a loading device oil supply system. The oil supply system consists of a temperature control system, a lubricating oil return system, a lubricating oil supply system and a loading device oil supply system, and the temperature control system, the lubricating oil return system, the lubricating oil supply system and the loading device oil supply system are respectively installed on an oil tank. The oil supply system is connected to the oil tank by the temperature control system and controls the temperature of the working oil in the oil tank. The outlet end of the lubricating oil return system is connected to the oil tank, the inlet end of the lubricating oil supply system is connected to the oil tank, and the inlet end of the loading device oil supply system is connected to the oil tank.

[0007] Further, the oil supply system is composed of a temperature control system including a first power source, an electric self-operated three-way temperature control valve, a cooler, a third pressure sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a third pressure gauge, a third flange butterfly valve, an electric stainless steel ball valve, a first stainless steel flange sight glass and a heater;

[0008] The first power source, the electric self-operated three-way temperature control valve, the cooler and the heater are installed on the oil tank through pipelines to form a circulation loop. The electric self-operated three-way temperature control valve is provided with two outlet ends, one outlet end of the electric self-operated three-way temperature control valve is connected with the inlet end of the cooler, and the other outlet end of the electric self-operated three-way temperature control valve is connected with the heater. The third pressure gauge is installed on the pipeline between the first power source and the electric self-operated three-way temperature control valve, and the fourth temperature sensor is installed on the pipeline between the outlet end of the electric self-operated three-way temperature control valve and the oil tank. The second temperature sensor and the third flange butterfly valve are installed on the return pipe of the cooling pipeline of the cooler. The electric stainless steel ball valve, the first stainless steel flange sight glass, the third pressure sensor and the third temperature sensor are installed on the inlet pipe of the cooling pipeline of the cooler. The temperature of the working oil circulating in the cooler is adjusted through the cooling pipeline of the cooler.

[0009] Further, the lubricating oil return system includes a second power source, a third power source, a fourth power source, a second flange butterfly valve, a second stainless steel flange sight glass, a fourth flange butterfly valve, a third stainless steel flange sight glass, a first check valve, a first return oil filter, a second return oil filter, a fifth flange butterfly valve, a fourth stainless steel flange sight glass and a second check valve;

[0010] A second flange butterfly valve, a second power source, a second stainless steel flange sight glass and a second return oil filter are installed in sequence on one lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is connected to the oil tank. A fourth flange butterfly valve, a third power source, a third stainless steel flange sight glass, a first check valve and a first return oil filter are installed in sequence on the mixed pipelines of the other two lubricating oil return pipelines, and the outlet ends of the mixed pipelines are connected to the oil tank. A fifth flange butterfly valve, a fourth power source, a fourth stainless steel flange sight glass and a second check valve are installed in sequence on another lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is installed on the pipeline between the first check valve and the first return oil filter.

[0011] Furthermore, the third power source is a variable frequency motor, and the motor speed of the variable frequency motor is remotely controlled.

[0012] Furthermore, the lubricating oil supply system includes four lubricating oil supply branches; the inlet end of each lubricating oil supply branch is connected to the oil tank.

[0013] Further, the lubricating oil supply branch includes a fifth power source, a first flange butterfly valve, a one-way valve, a first filter, a first electric precision regulating valve, a first electric ball valve, a first flow meter, a second pressure sensor, a first temperature sensor and a second pressure gauge;

[0014] The first flange butterfly valve, the fifth power source, the one-way valve, the second pressure gauge, the first filter, the first electric precision regulating valve, the first flow meter, the second pressure sensor, the first temperature sensor and the first electric ball valve are sequentially installed on the lubricating oil supply pipeline at the oil outlet end of the oil tank.

[0015] Furthermore, a fifth power source in the four lubricating oil supply branches is a variable frequency motor, and the motor speed of the variable frequency motor is remotely controlled.

[0016] Further, the oil supply system of the loading device includes a sixth power source, a third flange butterfly valve, a first pressure sensor, a first pressure gauge, a second filter, a safety valve, an electromagnetic reversing valve and a proportional pressure reducing valve;

[0017] The third flange butterfly valve, the sixth power source, the first pressure gauge, the second filter, the proportional pressure reducing valve, the first pressure sensor and the electromagnetic reversing valve are sequentially installed on the oil loading and supply pipeline at the oil outlet end of the oil tank, and the safety valve is installed on the oil loading and supply pipeline at the oil outlet end of the oil tank between the sixth power source and the second filter.

[0018] Beneficial effects of the present invention:

[0019] 1. The oil supply and return branches of the test bearing are decoupled, and the power source is equipped with a variable frequency motor to achieve a wide range of oil supply flow rate adjustment, and the oil supply flow rate and pressure are accurately controlled.

[0020] 2. The present application has a separate temperature control system A. The first power source 2.1 pumps out the working oil, which is then returned to the oil tank after being temperature-controlled by the cooler 14 and the heater 67. After the temperature-controlled working oil returns to the oil tank and is fully mixed with the oil in the oil tank, it enters each lubrication point through the oil supply system, which can achieve stable oil inlet temperature and precise temperature control. The lubricating oil return system B is decoupled into three oil return branches, which can operate independently of each other, thereby improving the applicability of the oil supply system. The lubricating oil inlet system C is decoupled into four oil supply branches, which can operate independently of each other. The fifth power source 2.5 of the three oil supply branches is a fixed-speed motor to meet the oil supply requirements of equipment with a fixed flow rate. The fifth power source 2.5 of the other oil supply branch uses a variable-frequency motor, which is specially designed for oil supply to test bearings. By adjusting the motor speed, a large range of oil supply can be adjusted. Each oil supply branch is completely independent of other oil supply branch systems, and precise control of the oil supply at a single oil supply point can be achieved. The oil supply system D of the loading device controls the pressure of the oil entering the hydraulic cylinder through the safety valve 42 and the electromagnetic reversing valve 44, thereby controlling the load acting on the test bearing. The oil supply system D of the loading hydraulic cylinder is highly integrated into the lubrication system of the bearing test bench.

[0021] 3. This application integrates the oil supply system of the loading device into the lubrication system, thus achieving a high degree of integration of the oil supply system of the bearing test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the oil supply system of the present application installed on the oil tank 1.

[0023] Figure 2 Schematic diagram of the oil supply system consisting of temperature control system A.

[0024] Figure 3 Schematic diagram of lubricating oil return system B.

[0025] Figure 4 Schematic diagram of lubricating oil supply system C.

[0026] Figure 5 Schematic diagram of the loading device oil supply system D. DETAILED DESCRIPTION

[0027] Specific implementation method 1: Combination Figure 1-Figure 5 The present embodiment is described. The present embodiment describes an oil supply system applied to a bearing test bench, which includes an oil supply system consisting of a temperature control system A, a lubricating oil return system B, a lubricating oil supply system C and a loading device oil supply system D. The oil supply system consists of a temperature control system A, a lubricating oil return system B, a lubricating oil supply system C and a loading device oil supply system D, and they are respectively installed on an oil tank 1. The oil supply system is connected to the oil tank 1 by the temperature control system A and controls the temperature of the working oil in the oil tank 1. The outlet end of the lubricating oil return system B is connected to the oil tank 1, the inlet end of the lubricating oil supply system C is connected to the oil tank 1, and the inlet end of the loading device oil supply system D is connected to the oil tank 1.

[0028] The temperature control system A is used to ensure that multiple oil supply branches can maintain a stable oil supply temperature. The lubricating oil return system B has three branches that operate independently of each other, which improves the applicability of the oil supply system. The lubricating oil supply system C has a total of four branches, and the four oil supply branches can operate independently of each other, which improves the applicability of the oil supply system.

[0029] Specific implementation method 2: Combination Figure 1 and Figure 2 The present embodiment is described. The present embodiment describes an oil supply system applied to a bearing test bench. The oil supply system is composed of a temperature control system A including a first power source 2.1, an electric self-operated three-way temperature control valve 13, a cooler 14, a third pressure sensor 33.3, a second temperature sensor 34.2, a third temperature sensor 34.3, a fourth temperature sensor 34.4, a third pressure gauge 35.3, a third flange butterfly valve 55, an electric stainless steel ball valve 56, a first stainless steel flange sight glass 57 and a heater 67;

[0030] The first power source 2.1, the electric self-operated three-way temperature control valve 13, the cooler 14 and the heater 67 are installed on the oil tank 1 through pipelines to form a circulation loop. The electric self-operated three-way temperature control valve 13 is provided with two outlets, one outlet of the electric self-operated three-way temperature control valve 13 is connected to the inlet of the cooler 14, and the other outlet of the electric self-operated three-way temperature control valve 13 is connected to the heater 67. The third pressure gauge 35.3 is installed on the pipeline between the first power source 2.1 and the electric self-operated three-way temperature control valve 13. The fourth temperature sensor 34.4 is installed on the pipeline between the outlet end of the electric self-operated three-way temperature control valve 13 and the oil tank 1, the second temperature sensor 34.2 and the third flange butterfly valve 55 are installed on the return pipe of the cooling pipeline of the cooler 14, and the electric stainless steel ball valve 56, the first stainless steel flange sight glass 57, the third pressure sensor 33.3 and the third temperature sensor 34.3 are installed on the water inlet pipe of the cooling pipeline of the cooler 14, and the temperature of the working oil circulating in the cooler 14 is adjusted through the cooling pipeline of the cooler 14. Other methods are the same as those in the first specific embodiment.

[0031] In this embodiment, the first power source 2.1 of the temperature control system A pumps the working oil out of the oil tank 1, and the working oil flows back to the oil tank 1 through the electric self-operated three-way temperature control valve 13, the cooler 14, and the heater 67 to complete the temperature control.

[0032] In this embodiment, the electric self-operated three-way temperature control valve 13 has two outlets, and can distribute the flow of the two outlets according to the oil temperature. One outlet enters the heater 67 through the connected cooler 14, and the other outlet directly enters the heater 67. When the oil temperature is higher than the set temperature of the electric self-operated three-way temperature control valve 13, the amount of oil entering the cooler 14 increases, otherwise the flow entering the cooler 14 decreases.

[0033] The working oil at the outlet of the electric self-operated three-way temperature control valve 13 is mixed with the working oil from the cooler 14 and enters the heater 67. The fourth temperature sensor 34.4 monitors the outlet temperature of the heater 67. When the fed-back oil temperature is lower than the set temperature of the heater 67, the heater 67 is heated, otherwise the heater 67 does not work.

[0034] The cooling medium of the cooler 14 is circulating water. The third flange butterfly valve 55 and the electric stainless steel ball valve 56 are used to adjust the inlet and return water amounts. The third temperature sensor 34.3 monitors the inlet water temperature. The second temperature sensor 34.2 monitors the return water temperature. The third pressure sensor 33.3 is used to monitor the inlet pressure of the circulating water.

[0035] Specific implementation method three: Combination Figure 1 and Figure 3The present embodiment is described. The present embodiment is an oil supply system applied to a bearing test bench. The lubricating oil return system B comprises a second power source 2.2, a third power source 2.3, a fourth power source 2.4, a second flange butterfly valve 5.2, a second stainless steel flange sight glass 16, a fourth flange butterfly valve 60, a third stainless steel flange sight glass 61, a first check valve 62, a first return oil filter 63, a second return oil filter 64, a fifth flange butterfly valve 74, a fourth stainless steel flange sight glass 76 and a second check valve 77.

[0036] A second flange butterfly valve 5.2, a second power source 2.2, a second stainless steel flange sight glass 16 and a second oil return filter 64 are sequentially installed on one lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is connected to the oil tank 1. A fourth flange butterfly valve 60, a third power source 2.3, a third stainless steel flange sight glass 61, a first check valve 62 and a first oil return filter 63 are sequentially installed on the pipeline after the other two lubricating oil return pipelines are mixed, and the outlet end of the pipeline after the two lubricating oil return pipelines are mixed is connected to the oil tank 1. A fifth flange butterfly valve 74, a fourth power source 2.4, a fourth stainless steel flange sight glass 76 and a second check valve 77 are sequentially installed on the other lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is installed on the pipeline between the first check valve 62 and the first oil return filter 63. Other methods are the same as those in the first embodiment.

[0037] In this embodiment, the lubricating oil return system B has three branches, and the three return branches can operate independently of each other to improve the applicability of the oil supply system. The three return branches have similar structures. The first return branch is used for the oil return of the speed increaser test gearbox of the bearing test bench, the second return branch is used for the oil supply of the front bearing of the bearing test bench auxiliary support and the oil supply of the test bearing of the bearing test bench, and the third return branch is used for the oil supply of the rear bearing of the bearing test bench auxiliary support.

[0038] The second oil return branch is composed of the third power source 2.3, the fourth flange butterfly valve 60, the third stainless steel flange sight glass 61, the first check valve 62, and the first oil return filter 63. The third power source 2.3 pumps the lubricating oil in the oil return cavity of the bearing test bench back to the oil tank.

[0039] The third stainless steel flange sight glass 61 is used to observe the lubricating oil return state so as to adjust the oil return capacity;

[0040] The first check valve 62 prevents the lubricating oil from flowing back;

[0041] The first oil return filter 63 filters the lubricating oil impurities in the second oil return branch;

[0042] After the fourth flange butterfly valve 60 is closed, the second oil return branch b can be separated from the system, thereby increasing the flexibility of the system.

[0043] Specific implementation method 4: Combination Figure 1 and Figure 3 This embodiment is described as an oil supply system for a bearing test bench. The third power source 2.3 is a variable frequency motor, and the variable frequency motor remotely controls its motor speed. The oil return capacity can be adjusted by changing the motor speed. Other methods are the same as those of the third embodiment.

[0044] Specific implementation method five: combination Figure 1 and Figure 4 This embodiment is described as an oil supply system applied to a bearing test bench, wherein the lubricating oil supply system C includes four lubricating oil supply branches; the inlet end of each lubricating oil supply branch is connected to the oil tank 1. Other methods are the same as those in the first embodiment.

[0045] In this embodiment, the lubricating oil supply system C has four branches, and the four oil supply branches can operate independently of each other, thereby improving the applicability of the oil supply system.

[0046] Specific implementation method six: combination Figure 1 and Figure 4 The present embodiment is described. The present embodiment is an oil supply system applied to a bearing test bench. The lubricating oil supply branch includes a fifth power source 2.5, a first flange butterfly valve 5.1, a one-way valve 12, a first filter 15.1, a first electric precision regulating valve 17.1, a first electric ball valve 18.1, a first flow meter 19.1, a second pressure sensor 33.2, a first temperature sensor 34.1 and a second pressure gauge 35.2.

[0047] The first flange butterfly valve 5.1, the fifth power source 2.5, the one-way valve 12, the second pressure gauge 35.2, the first filter 15.1, the first electric precision regulating valve 17.1, the first flow meter 19.1, the second pressure sensor 33.2, the first temperature sensor 34.1 and the first electric ball valve 18.1 are sequentially installed on the pipeline for supplying lubricating oil at the oil outlet end of the oil tank 1. Other methods are the same as those in the fifth embodiment.

[0048] In this embodiment, the first lubricating oil supply branch supplies oil to the front bearing of the auxiliary support of the bearing test bench, the second lubricating oil supply branch supplies oil to the test bearing of the bearing test bench, the third lubricating oil supply branch supplies oil to the rear bearing of the auxiliary support of the bearing test bench, and the fourth lubricating oil supply branch supplies oil to the speed increase companion gearbox of the bearing test bench.

[0049] The one-way valve 12 prevents the lubricating oil from flowing back;

[0050] The second pressure gauge 35.2 monitors the pressure of the lubricating oil supply branch;

[0051] The first filter 15.1 filters the lubricating oil impurities in the lubricating oil supply branch;

[0052] When the pressure is too high, the first electric precision regulating valve 17.1 overflows and unloads to protect the valve.

[0053] The first flow meter 19.1 is used to monitor the oil supply flow of the lubricating oil supply branch;

[0054] The first temperature sensor 34.1 is used to monitor the oil supply temperature of the lubricating oil supply branch;

[0055] The second pressure sensor 33.2 is used to monitor the oil supply pressure of the lubricating oil supply branch;

[0056] The first electric ball valve 18.1 is used to cut off the oil supply branch to improve the applicability of the oil supply system.

[0057] Specific implementation method seven: Combination Figure 1 and Figure 4 This embodiment is described as an oil supply system for a bearing test bench, wherein one of the five power sources 2.5 in the four lubricating oil supply branches is a variable frequency motor, and the motor speed of the variable frequency motor is remotely controlled. Other methods are the same as those in the sixth embodiment.

[0058] In this embodiment, the second four lubricating oil supply branches have similar composition structures, and the fifth power source 2.5 of one of the lubricating oil supply branches is a variable frequency motor, which can control the oil supply amount of the test bearing to meet the lubricating oil demand of different bearings.

[0059] Specific implementation method eight: Combination Figure 1 and Figure 5 The present embodiment is described as an oil supply system applied to a bearing test bench, the loading device oil supply system D comprises a sixth power source 2.6, a third flange butterfly valve 5.3, a first pressure sensor 33.1, a first pressure gauge 35.1, a second filter 15.2, a safety valve 42, an electromagnetic reversing valve 44 and a proportional pressure reducing valve 46;

[0060] The third flange butterfly valve 5.3, the sixth power source 2.6, the first pressure gauge 35.1, the second filter 15.2, the proportional pressure reducing valve 46, the first pressure sensor 33.1 and the electromagnetic reversing valve 44 are sequentially installed on the pipeline for loading and supplying oil at the oil outlet of the oil tank 1, and the safety valve 42 is installed on the pipeline for loading and supplying oil at the oil outlet of the oil tank 1 between the sixth power source 2.6 and the second filter 15.2. Other methods are the same as those in the first specific implementation.

[0061] In this embodiment, the sixth power source 2.6 pumps the working oil out of the oil tank 1. When the pressure of the pumped working oil is smaller than the set value of the safety valve 42, the safety valve 42 is closed, and the working oil flows through the filter 43 and enters the proportional pressure reducing valve 46 for pressure regulation. The working oil adjusted to a certain pressure enters the chamber of the hydraulic cylinder through the electromagnetic reversing valve 44.

[0062] The safety valve 42 can ensure that the inlet pressure of the proportional pressure reducing valve 46 reaches the upper limit of the proportional pressure reducing valve 46. When the inlet pressure of the proportional pressure reducing valve 46 is greater than the set value of the safety valve 42, the safety valve 42 overflows and reduces pressure.

[0063] The proportional pressure reducing valve 46 is used to obtain the working oil at the target pressure and can remotely adjust the outlet pressure.

[0064] The second filter 15.2 filters impurities in the working oil.

[0065] The electromagnetic reversing valve 44 controls the loading and unloading actions of the hydraulic cylinder by reversing.

[0066] The first pressure sensor 33.1 is used to monitor the hydraulic cylinder inlet pressure.

[0067] The first pressure gauge 35.1 is used to monitor the inlet flow of the proportional pressure reducing valve.

[0068] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. An oil supply system for a bearing test bench, characterized in that: The oil supply system comprises a temperature control system (A), a lubricating oil return system (B), a lubricating oil supply system (C) and a loading device oil supply system (D). The oil supply system comprises the temperature control system (A), the lubricating oil return system (B), the lubricating oil supply system (C) and the loading device oil supply system (D), which are respectively installed on an oil tank (1). The oil supply system is connected to the oil tank (1) by the temperature control system (A) and controls the temperature of the working oil in the oil tank (1). The outlet end of the lubricating oil return system (B) is connected to the oil tank (1), the inlet end of the lubricating oil supply system (C) is connected to the oil tank (1), and the inlet end of the loading device oil supply system (D) is connected to the oil tank (1).

2. The oil supply system for a bearing test bench according to claim 1, characterized in that: The oil supply system comprises a temperature control system (A) including a first power source (2.1), an electric self-operated three-way temperature control valve (13), a cooler (14), a third pressure sensor (33.3), a second temperature sensor (34.2), a third temperature sensor (34.3), a fourth temperature sensor (34.4), a third pressure gauge (35.3), a third flange butterfly valve (55), an electric stainless steel ball valve (56), a first stainless steel flange sight glass (57) and a heater (67); The first power source (2.1), the electric self-operated three-way temperature control valve (13), the cooler (14) and the heater (67) are installed on the oil tank (1) through pipelines to form a circulation loop. The electric self-operated three-way temperature control valve (13) is provided with two outlet ends. One outlet end of the electric self-operated three-way temperature control valve (13) is connected to the inlet end of the cooler (14), and the other outlet end of the electric self-operated three-way temperature control valve (13) is connected to the heater (67). The third pressure gauge (35.3) is installed on the pipeline between the first power source (2.1) and the electric self-operated three-way temperature control valve (13). A fourth temperature sensor (34.4) is installed on a pipeline between the outlet end of the electric self-operated three-way temperature control valve (13) and the oil tank (1); a second temperature sensor (34.2) and a third flange butterfly valve (55) are installed on a return pipe of the cooling pipeline of the cooler (14); an electric stainless steel ball valve (56), a first stainless steel flange sight glass (57), a third pressure sensor (33.3) and a third temperature sensor (34.3) are installed on a water inlet pipe of the cooling pipeline of the cooler (14); and the temperature of the working oil circulating in the cooler (14) is adjusted through the cooling pipeline of the cooler (14).

3. The oil supply system for a bearing test bench according to claim 1, characterized in that: The lubricating oil return system (B) comprises a second power source (2.2), a third power source (2.3), a fourth power source (2.4), a second flange butterfly valve (5.2), a second stainless steel flange sight glass (16), a fourth flange butterfly valve (60), a third stainless steel flange sight glass (61), a first check valve (62), a first return oil filter (63), a second return oil filter (64), a fifth flange butterfly valve (74), a fourth stainless steel flange sight glass (76) and a second check valve (77); A second flange butterfly valve (5.2), a second power source (2.2), a second stainless steel flange sight glass (16) and a second oil return filter (64) are sequentially installed on one lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is connected to the oil tank (1). A fourth flange butterfly valve (60), a third power source (2.3), a third stainless steel flange sight glass (61), a first check valve (62) and a first oil return filter (63) are sequentially installed on the pipeline after the other two lubricating oil return pipelines are mixed, and the outlet ends of the pipeline after the two lubricating oil return pipelines are mixed are connected to the oil tank (1). A fifth flange butterfly valve (74), a fourth power source (2.4), a fourth stainless steel flange sight glass (76) and a second check valve (77) are sequentially installed on the other lubricating oil return pipeline, and the outlet end of the lubricating oil return pipeline is installed on the pipeline between the first check valve (62) and the first oil return filter (63).

4. The oil supply system for a bearing test bench according to claim 3 is characterized in that: The third power source (2.3) is a variable frequency motor, and the motor speed of the variable frequency motor is remotely controlled.

5. The oil supply system for a bearing test bench according to claim 1, characterized in that: The lubricating oil supply system (C) comprises four lubricating oil supply branches; the inlet end of each lubricating oil supply branch is connected to the oil tank (1).

6. The oil supply system for a bearing test bench according to claim 5, characterized in that: The lubricating oil supply branch comprises a fifth power source (2.5), a first flange butterfly valve (5.1), a one-way valve (12), a first filter (15.1), a first electric precision regulating valve (17.1), a first electric ball valve (18.1), a first flow meter (19.1), a second pressure sensor (33.2), a first temperature sensor (34.1) and a second pressure gauge (35.2); The first flange butterfly valve (5.1), the fifth power source (2.5), the one-way valve (12), the second pressure gauge (35.2), the first filter (15.1), the first electric precision regulating valve (17.1), the first flow meter (19.1), the second pressure sensor (33.2), the first temperature sensor (34.1) and the first electric ball valve (18.1) are sequentially installed on a pipeline for supplying lubricating oil at the oil outlet end of the oil tank (1).

7. The oil supply system for a bearing test bench according to claim 6, characterized in that: A fifth power source (2.5) in the four lubricating oil supply branches is a variable frequency motor, and the motor speed of the variable frequency motor is remotely controlled.

8. The oil supply system for a bearing test bench according to claim 1, characterized in that: The loading device oil supply system (D) comprises a sixth power source (2.6), a third flange butterfly valve (5.3), a first pressure sensor (33.1), a first pressure gauge (35.1), a second filter (15.2), a safety valve (42), an electromagnetic reversing valve (44) and a proportional pressure reducing valve (46); The third flange butterfly valve (5.3), the sixth power source (2.6), the first pressure gauge (35.1), the second filter (15.2), the proportional pressure reducing valve (46), the first pressure sensor (33.1) and the electromagnetic reversing valve (44) are sequentially installed on the pipeline for loading and supplying oil at the oil outlet end of the oil tank (1), and the safety valve (42) is installed on the pipeline for loading and supplying oil at the oil outlet end of the oil tank (1) between the sixth power source (2.6) and the second filter (15.2).

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