A method for detecting the quality of an oil pump

Abstract

The application relates to the technical field of product detection, and specifically discloses a machine oil pump quality detection method, which realizes the opening pressure test of a pressure regulating valve before the assembly of a machine oil pump is completed by closing the oil inlet channel of a pump body through a side blocking mechanism, closing the oil outlet channel outlet of the pump body through a sealing ring on a test table, and providing the pump oil cavity with gas with pressure and continuously increasing pressure through a gas pressure adjusting module; after the opening pressure test of the pressure regulating valve is completed, the inner rotor and the outer rotor of a pump oil structure are installed into the pump oil cavity, and the height difference between the end face of the inner rotor and the end face of the pump oil cavity and the height difference between the end face of the outer rotor and the end face of the pump oil cavity are detected through a height difference detection device after the installation of the inner rotor and the outer rotor of the pump oil structure. The scheme is used to solve the problem of the influence of high-pressure gas on the pump oil structure performance in the pump oil cavity of the pump body during the opening pressure test of the pressure regulating valve in the prior art and solve the problem of how to improve the automation degree of height difference detection.

Description

[0001] This application is a divisional application of the patent application filed on December 17, 2021, with application number 2021115539109 and invention title "An Oil Pump Quality Inspection System". Technical Field

[0002] This invention relates to the field of product testing technology, specifically to a method for testing the quality of an oil pump. Background Technology

[0003] Diesel (or gasoline) engines are generally equipped with an oil pump. The oil pump includes a pump body, an oil pumping structure installed in the oil pumping chamber of the pump body, and a pump cover that seals the oil pumping chamber. The oil pump draws oil into the oil pumping chamber and then discharges the drawn oil under pressure to the engine's oil filter and various lubrication passages, thereby achieving functions such as lubrication, friction reduction, cooling, corrosion prevention, and shock absorption for the various transmission pairs of the engine.

[0004] All oil pumps in high-flow diesel (or gasoline) engines must be equipped with a safety protection component, a pressure regulating valve (also known as a safety valve or pressure limiting valve; the pump body's oil chamber is connected to a pressure relief channel, and a pressure regulating valve is installed on the pressure relief channel). The pressure regulating valve maintains the normal oil pressure delivered into the engine's lubrication passages to prevent excessively high or low oil pressure in the engine system, which could cause oil leaks or insufficient lubrication in various parts of the engine, leading to abnormal conditions in engine cooling, cleaning, sealing, corrosion prevention, and vibration damping.

[0005] In addition to being affected by the shape and structure of the pump itself, the oil suction and discharge performance of an oil pump is also affected by the clearance between the pump structure and the pump chamber on the pump body. Taking an oil pump structure with an inner rotor and an outer rotor as an example, the tooth profile, shaping, and machining parameters of the inner and outer rotors affect the oil suction and discharge performance. The clearance between the inner rotor, the outer rotor, and the pump cover also has a significant impact on the oil suction and discharge performance; and the size of the clearance depends on the difference in height between the inner rotor, the outer rotor, and the pump chamber.

[0006] In the prior art, in order to improve the product quality of oil pumps, after installing an inner rotor and an outer rotor on the oil pump, a height difference device is used to detect the height difference between the end face of the inner rotor and the end face of the pump oil chamber, as well as the height difference between the end face of the outer rotor and the end face of the pump oil chamber. After the height difference test is qualified, the pump cover is then sealed to close the pump oil chamber. After the oil pump assembly is completed, the opening pressure of the pressure regulating valve is tested.

[0007] One method for testing the opening pressure of the pressure regulating valve is a pneumatic test. Specifically, the oil pump is placed on a test bench, and a clamping mechanism on top of the pump body is used to press the oil pump. High-pressure gas is then injected into the pump chamber until the pressure regulating valve, connected to the pump chamber, automatically opens. The pressure at which the pressure regulating valve automatically opens is the opening pressure of the pressure regulating valve. While this test simplifies the detection of the pressure regulating valve's opening pressure and offers high efficiency and low cost, the continuous flow of high-pressure gas into the pump chamber during the pneumatic test, which connects to both the oil inlet channel and the... The oil drain channel is connected to the pressure relief channel used to install the pressure regulating valve. The existing clamping mechanism only achieves pressing at the upper end of the oil pump chamber and the corner of the pump body. However, under high pressure testing, the oil pump is prone to displacement due to high pressure. On the one hand, this affects the accuracy of the pressure regulating valve opening pressure test, and on the other hand, the displacement of the oil pump under high pressure can also easily lead to safety hazards. In addition, during the gas test, the pressure in the oil pump chamber is constantly increasing. Since the oil pump structure is installed in the oil pump chamber, the performance of the oil pump structure will be affected to a certain extent when subjected to high pressure testing. Summary of the Invention

[0008] The present invention aims to provide an oil pump quality testing system to solve the problem in the prior art where the high pressure of high-pressure gas affects the performance of the pump oil structure in the pump body and pump oil chamber during the pressure test of the pressure regulating valve opening.

[0009] To achieve the above objectives, the basic solution of the present invention is as follows:

[0010] An oil pump quality inspection system includes a pressure testing device and a height difference detection device. The pressure testing device includes a test bench and a clamping mechanism. The pressure testing device is located in the process preceding the height difference detection device. The clamping mechanism includes a pressure plate, a pressure disc connected to the pressure plate, and several pressure rods. The pressure rods can abut against different positions of the pump body. An upper sealing gasket is provided at the bottom of the pressure disc, and a lower sealing gasket is provided on the test bench. The upper and lower sealing gaskets can seal the upper and lower end faces of the pumping chamber of the pump body.

[0011] Compared to existing technologies, the following benefits are achieved:

[0012] In this scheme, the pump body is pressed against the test bench using the clamping mechanism's pressure rod. Simultaneously, the pressure plate with an upper sealing gasket on the clamping mechanism seals one end of the pump body's oil chamber, while the lower sealing gasket on the test bench seals the other end of the oil chamber. This allows for pressure testing of the regulating valve before the oil pump assembly is complete, simply by sealing the other channels of the oil chamber, even without the pump structure installed. In other words, the pressure testing of the regulating valve can be completed before the pump structure is installed into the oil chamber. After the pressure regulating valve pressure opening test is completed, the inner and outer rotors of the pump structure are installed into the pump chamber. After the inner and outer rotors of the pump structure are installed, the height difference detection device is used to detect the height difference between the end face of the inner rotor and the end face of the pump chamber, as well as the height difference between the end face of the outer rotor and the end face of the pump chamber. Compared with the existing technology, this solution enables timely detection and processing of pump body quality, and can also achieve the opening pressure test of the pressure regulating valve even when the pump structure is not installed in the pump chamber, completely avoiding the impact of high pressure testing on the performance of the pump structure.

[0013] Furthermore, several of the pressure rods can be pressed against both sides of the channel communicating with the pump oil chamber of the pump body.

[0014] Beneficial effects: When using this solution, the pump body is placed on the test bench, and the pump body is compressed by the clamping mechanism above the test bench. Specifically, during compression, the top of the pump body's oil chamber is compressed by a pressure plate, and several pressure rods are used to compress the channels communicating with the pump body's oil chamber on both sides. This ensures that in addition to the oil chamber being compressed, other channels that simultaneously bear high-pressure gas are also compressed, guaranteeing that the entire pump body is fully compressed. This avoids situations where the oil chamber is not properly sealed or the pump body shifts due to insufficient compression, which could lead to inaccurate pressure testing of the pressure regulating valve and safety hazards caused by pump body displacement.

[0015] Furthermore, the test bench is equipped with a limiting post and a positioning component. The limiting post can be inserted into the mounting hole of the pump body, and the positioning component is in contact with the surface of the pump body.

[0016] Beneficial effects: By setting the limiting post and positioning component, the position of the pump body during the testing process is further limited, ensuring that the pump body does not shift during the pressure test when the pressure regulating valve is opened. In addition, the setting of the limiting post and positioning component allows the pump body to be placed more quickly and accurately. When placing, simply press the pump body directly against the positioning component first, and then quickly place the pump body downward. During the downward placement process, the mounting hole of the pump body is automatically inserted into the limiting post, completing the rapid and accurate positioning of the pump body, which helps to improve the testing efficiency.

[0017] Furthermore, a sleeve is fixedly connected to the pressure plate, and a pressure rod is vertically slidably connected to the sleeve, with the top of the pressure rod able to abut against the pressure plate.

[0018] Beneficial Effects: In practical use, when the lower sealing gasket is not subjected to external force from the clamping mechanism, it pushes the pump body upwards, causing the pump body to tilt when it is first placed on the test bench. If a rapid clamping method is used directly, the pump body may be clamped while tilted, i.e., before the position is properly adjusted, resulting in an incomplete seal of the pump oil chamber and affecting the accuracy of the test. This solution, through the sleeve design, ensures that multiple pressure rods only achieve initial positioning and not clamping when they touch the pump body. Only when the pressure plate moves downwards, driving the sleeve to move, until the top of the pressure rod abuts against the lower surface of the pressure plate, will it truly clamp the pump body. This process ensures that the bottom of the pressure rod first contacts the pump body, then finds the clamping position, and finally clamps the pump body, achieving comprehensive and accurate clamping of the pump body, ensuring the tightness of the pump oil chamber seal, and improving the accuracy of the pressure regulating valve pressure test.

[0019] Furthermore, the pressing mechanism includes a driver for driving the pressure plate to rise and fall. The driver includes a main driver and auxiliary drivers located on both sides of the main driver. The output ends of the main driver and auxiliary drivers are both fixedly connected to the pressure plate, and the output end of the main driver is fixedly connected to the middle of the pressure plate.

[0020] Beneficial effects: By setting up main and secondary drives, the middle and both sides of the pressure plate are driven, which makes the pressure plate more evenly stressed.

[0021] Furthermore, the pressure testing device also includes a pressure regulating module, a pressure sensor, and a control module. The pressure regulating module provides pressurized gas to the pump oil chamber. The pressure sensor is connected between the pressure regulating module and the pump oil chamber and is used to collect pressure data from the pump oil chamber. Both the pressure regulating module and the pressure sensor are connected to the control module. The control module controls the pressure regulating module to provide gas with continuously increasing pressure to the pump oil chamber. The control module receives and stores the pressure data from the pressure sensor. The control module establishes a pressure curve that changes over time based on the pressure data. The control module determines the inflection point on the pressure curve based on the pressure curve data. The pressure corresponding to the inflection point is determined as the opening pressure of the pressure regulating valve.

[0022] Beneficial effects: The solution collects pressure data from the pump oil chamber in real time through a pressure sensor, and saves the collected pressure data in real time through a control module. The control module can establish a pressure curve that changes over time based on the pressure data, realizing process recording and monitoring of the pressure test process. Furthermore, the control module controls the air pressure regulating module to continuously increase the test air pressure delivered to the pump oil chamber, and automatically determines the inflection point based on the change of the pressure curve and automatically determines whether the opening pressure of the pressure regulating valve is qualified based on the air pressure value at the inflection point, which greatly improves the degree of automation.

[0023] Furthermore, the height difference detection device includes a worktable, a displacement sensor, a controller, and a mover that drives the displacement sensor to move in space. The displacement sensor is connected to the output end of the mover, and both the displacement sensor and the mover are connected to the controller. The controller is used to control the mover to drive the displacement sensor to move in space.

[0024] Beneficial effects: When adopting this solution, the controller controls the mover to drive the displacement sensor to detect the height of the inner rotor end face, outer rotor end face, and pump body oil cavity end face. This allows different parts to be detected with a single displacement sensor, improving the level of automation. In addition, through the setting of the controller and mover, this solution enables the height difference detection device to detect the height difference of the inner rotor, outer rotor, and pump body oil cavity end faces of oil pumps of different sizes and models, improving the practicality of this detection system.

[0025] Furthermore, the controller controls the displacement sensor to collect height data of multiple test points on the pump oil chamber end face of the pump body. The controller establishes a reference plane based on the received height data collected on the pump oil chamber end face. The controller controls the mover to move and controls the displacement sensor to collect height data of multiple test points on the outer rotor end face and multiple test points on the inner rotor end face. The controller receives the height data collected on the outer rotor end face and the inner rotor end face and compares each height data with the reference plane to obtain the height difference between the test point on the outer rotor end face and the reference plane, and the height difference between the test point on the inner rotor end face and the reference plane.

[0026] Beneficial effects: This solution enables automatic acquisition of height data for all test points through the control of the locator and displacement sensor by the controller. At the same time, a reference plane is established based on the acquired data, and the height difference between the test points on the outer rotor end face and the reference plane and the height difference between the test points on the inner rotor end face and the reference plane are determined based on the established reference plane, which further improves the automation level of this detection system.

[0027] Furthermore, the workbench is provided with a positioning block, which is in concave-convex fit with the pump body.

[0028] Beneficial effects: By setting up the positioning block, the pump body can be fixed in place, which makes it easier to place the pump body quickly and accurately in the designated position on the worktable.

[0029] Furthermore, the positioning block is equipped with a control switch, which is connected to the controller.

[0030] Beneficial effects: When using this solution, the pump body is only considered to be in place when it is placed on the positioning block. At the same time, the control switch is automatically triggered when the pump body is in place. After the control switch is triggered, the controller receives the signal and controls the mover to start driving the displacement sensor to collect data, which further improves the automation level of this detection system. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural schematic diagram of the pressure testing device in Embodiment 1 of the present invention;

[0032] Figure 2 for Figure 1 The main view;

[0033] Figure 3 for Figure 1 A partial right-side sectional view in the middle;

[0034] Figure 4 This is a three-dimensional structural diagram of the test platform in Embodiment 1 of the present invention;

[0035] Figure 5 This is a three-dimensional structural diagram of the pump body after it has been placed on the test bench in Embodiment 1 of the present invention;

[0036] Figure 6 for Figure 5 A three-dimensional structural diagram of the pump body after it has been pressed by the pressure head and the pressure plate;

[0037] Figure 7 This is a connection diagram of the air pressure regulation module and the air intake channel of the test bench in Embodiment 1 of the present invention;

[0038] Figure 8 This is a three-dimensional structural schematic diagram of the pressure testing device in Embodiment 2 of the present invention;

[0039] Figure 9 for Figure 8 A three-dimensional structural diagram of the pump body after it has been placed in the center;

[0040] Figure 10 This is a three-dimensional structural diagram of the lifting device and the lifting plate after separation in Embodiment 2 of the present invention;

[0041] Figure 11 This is a schematic diagram of the displacement sensor collecting height data at the test point in Embodiment 2 of the present invention. Detailed Implementation

[0042] The following detailed description illustrates the specific implementation method:

[0043] The reference numerals in the accompanying drawings include: frame 1, test bench 2, lower sealing gasket 21, air inlet channel 22, air outlet channel 23, limit post 24, positioning component 25, driver 3, main drive 31, auxiliary drive 32, pressure plate 4, sleeve 41, upper plate 42, middle plate 43, lower plate 44, pressure plate 5, upper sealing gasket 51, connecting rod 52, pressing plate 53, pressure rod 6, pressure head 61, pusher 7, moving block 71, pump body 10, pump oil chamber 101, oil inlet channel 102, oil outlet channel 103, pressure relief channel 104, inner rotor 20, outer rotor 30, workbench 8, positioning block 81, guide part 811, positioning part 812, standard block 82, control switch 83, displacement sensor 40, mover 9, lifting device 91, lifting plate 92.

[0044] Example 1

[0045] Example 1 is basically as shown in the appendix. Figures 1 to 7 As shown, an oil pump quality inspection system includes a pressure testing device and a height difference detection device. The pressure testing device is located before the height difference detection device. The pressure testing device is used to test the opening pressure of the pressure regulating valve on the pump body 10 with the pressure regulating valve. The height difference detection device is used to detect the height difference between the end face of the inner rotor 20 and the end face of the pump body 10, and the height difference between the end face of the outer rotor 30 and the end face of the pump body 10, after the pump structure with the inner rotor 20 and the outer rotor 30 is installed in the pump oil chamber 101 of the pump body 10.

[0046] The pressure testing device includes a frame 1, a test bench 2, a clamping mechanism, a pressure regulating module, a pressure sensor, and a control module. The clamping mechanism includes a driver 3, a pressure plate 4, a pressure disc 5 connected to the pressure plate 4, and several pressure rods 6. The driver 3 is fixedly installed on the frame 1, and the clamping mechanism is located above the test bench 2. The driver 3 is used to drive the pressure plate 4 to rise and fall. The pressure disc 5 can clamp onto the pump oil chamber 101 of the pump body 10. The pressure rods 6 can clamp onto both sides of the channel communicating with the pump oil chamber 101. The pump oil chamber 101 is connected to an oil inlet channel 102, an oil outlet channel 103, and a pressure relief channel 104.

[0047] The driver 3 includes a main driver 31 and a secondary driver 32 located on both sides of the main driver 31. Both the main driver 31 and the secondary driver 32 are fixedly connected to the frame 1. The output ends of the main driver 31 and the secondary driver 32 are fixedly connected to the pressure plate 4. The output end of the main driver 31 is fixedly connected to the middle of the pressure plate 4. In this embodiment, both the main driver 31 and the secondary driver 32 are cylinders.

[0048] Combination Figure 3 and Figure 4 The test bench 2 is fixedly connected to the lower sealing gasket 21 by screws, and the lower surface of the pressure plate 5 is fixed to the upper sealing gasket 51 by screws. The upper sealing gasket 51 and the lower sealing gasket 21 are located on the upper and lower sides of the pump oil chamber 101.

[0049] The test bench 2 has an air intake channel 22 and an air passage 23 on the lower sealing gasket 21. One end of the air passage 23 is connected to the air intake channel 22, and the other end of the air passage 23 is connected to the pump oil chamber 101. The upper surface of the test bench 2 is fixedly connected to a limit post 24 and a positioning piece 25 by screws. The limit post 24 can be inserted into the mounting hole of the pump body 10, and the positioning piece 25 is in contact with the surface of the pump body 10 and is located on one side of the limit post 24. The end of the air intake channel 22 away from the air passage 23 is connected to the air pressure regulating module.

[0050] Several sleeves 41 are fixedly connected to the pressure plate 4 by screws. Each pressure rod 6 corresponds to a sleeve 41. The pressure rod 6 is vertically slidably connected to the sleeve 41, and the top of the pressure rod 6 can abut against the pressure plate 4. The bottom end of the pressure rod 6 is threadedly connected to a pressure head 61. The pressure plate 5 includes a connecting rod 52 and a pressing plate 53. The connecting rod 52 is vertically slidably connected to the corresponding sleeve 41, and the top of the connecting rod 52 can abut against the pressure plate 4. The pressing plate 53 is threadedly connected to the connecting rod 52 and can press against the pump oil chamber 101. The upper sealing gasket 51 is fixed to the bottom of the pressing plate 53. In this embodiment, the pressure plate 4 includes an upper plate 42, a middle plate 43 and a lower plate 44 arranged sequentially from top to bottom. The middle plate 43 is sandwiched between the upper plate 42 and the lower plate 44. The upper plate 42 and the lower plate 44 are fixedly connected. Next, the upper plate 42 is fixedly connected to the output end of the driver 3, and the sleeve 41 is fixedly connected to the lower plate 44. After the pressure rod 6 and the connecting rod 52 move upward, they can press against the middle plate 43. The existence of the middle plate 43 facilitates the installation of the pressure plate 4 and the output end of the driver 3, as well as the installation of the sleeve 41, the connecting rod 52 and the pressure rod 6. On the other hand, it also allows the middle plate 43 in the pressure plate 4 to be replaced only when it is damaged, reducing the replacement cost. In addition, the setting of the upper plate 42 and the lower plate 44 facilitates the disassembly, assembly and maintenance of the components connected to them respectively.

[0051] The test bench 2 is also equipped with a side-blocking mechanism, which includes a pusher 7 and a moving block 71 fixed at the output end of the pusher 7. A sealing ring is installed on the moving block 71. The sealing ring can abut against the side of the pump body 10, and the sealing ring on the moving block 71 can block the channel on the side of the pump body 10 that communicates with the pump oil chamber 101. In this embodiment, the channel on the side of the pump body 10 is the oil inlet channel 102, and the pusher 7 is a cylinder.

[0052] In this embodiment, the outlet of the oil discharge channel 103 of the pump body 10 faces the test bench 2, and a sealing ring is installed on the test bench 2 to seal the outlet of the oil discharge channel 103 of the pump body 10.

[0053] Combination Figure 7The pressure regulating module and pressure sensor are both connected to the control module. The pressure regulating module is used to supply pressurized gas to the pump oil chamber 101. The pressure regulating module includes a gas storage device and a booster. The gas storage device is used to store compressed gas. In this embodiment, the gas storage device includes an air compressor and a gas tank. The air compressor injects high-pressure air into the gas tank. The input end of the booster is connected to the output end of the gas storage device, and the output end of the booster is connected to the pump oil chamber 101. A proportional valve is connected to the output end of the booster. The output end of the proportional valve is connected to the intake channel 22 through a pipe. The pressure sensor is installed on the pipe connecting the proportional valve and the intake channel 22. The pressure sensor is used to collect the pressure data of the pump oil chamber 101. The booster and the proportional valve are both connected to the control module. The proportional valve is used to ensure that the pressure sent to the pump oil chamber 101 by the booster is increased at the same gradient.

[0054] The control module controls the air pressure regulating module to supply gas with continuously increasing pressure to the pump oil chamber 101. The control module receives and stores pressure data from the pressure sensor, establishes a pressure curve that changes over time based on the pressure data, and determines the inflection point on the pressure curve. The pressure corresponding to the inflection point is determined as the opening pressure of the pressure regulating valve. When the pressure corresponding to the inflection point exceeds the preset qualified pressure range, the control module issues an alarm. The control module includes a first display, which can display the pressure curve.

[0055] The specific implementation process is as follows:

[0056] When performing a pressure opening test on the pressure regulating valve of the pump body 10 using this embodiment, the pump body 10 with the pressure regulating valve is first transported to the test bench 2. When the pump body 10 is placed on the test bench 2, it is first pressed directly against the positioning part 25. Then the pump body 10 can be quickly placed downwards. During the downward placement of the pump body 10, the mounting hole of the pump body 10 is automatically inserted into the limiting post 24, thus completing the rapid and accurate positioning of the pump body 10.

[0057] Next, the clamping mechanism is activated, causing the main drive 31 and auxiliary drive 32 of the driver 3 to move the pressure plate 4 downward, which in turn moves the pressure rod 6 and connecting rod 52 sliding in the sleeve 41 downward. The pressure plate 4 moves downward until the pressure head 61 at the end of the pressure rod 6 contacts the pump body 10. At the same time, the clamping plate 53 and upper sealing gasket 51 at the end of the connecting rod 52 contact the pump body 10. The driver 3 continues to move the pressure plate 4 downward until the pressure rod 6 and connecting rod 52 move along the sleeve 41 and press against the pressure plate 4, completing the pressing of the pump body 10. While the pump body 10 is being pressed, the upper and lower end faces of the pump oil chamber 101 are blocked by the upper sealing gasket 51 and the lower sealing gasket 21, respectively. Since the outlet of the oil discharge channel 103 on the pump body 10, which communicates with the oil chamber 101, faces the test bench 2, and the test bench 2 is equipped with a sealing ring to block the outlet of the oil discharge channel 103, the outlet of the oil discharge channel 103 of the pump body 10 is blocked.

[0058] The pusher 7 of the side-blocking mechanism is activated, causing the pusher 7 to drive the moving block 71 to press against the side of the pump body 10. Since the moving block 71 is equipped with a sealing ring that blocks the oil inlet channel 102 on the side of the pump body 10, the opening of the oil inlet channel 102 of the pump body 10 is also blocked.

[0059] Finally, the control module controls the air pressure regulation module to input high-pressure gas into the air intake channel 22 of the test bench 2, and continuously increases the pressure of the high-pressure gas in a gradient manner through the booster and proportional valve, so that the high-pressure gas enters the sealed pump oil chamber 101 through the air intake channel 22 and the air passage 23. When the pressure in the pump oil chamber 101 exceeds the pressure regulating valve's bearing capacity, the pressure regulating valve automatically opens.

[0060] In this embodiment, the top of the pump oil chamber 101 is pressed and sealed by the pressure plate 5, and the channels communicating with the pump oil chamber 101 are pressed on both sides by several pressure rods 6. This ensures that in addition to the pump oil chamber 101 being pressed, other channels that are simultaneously subjected to high-pressure gas are also pressed, thus ensuring that the entire pump body 10 is fully pressed. This avoids the safety hazards caused by inaccurate pressure testing of the pressure regulating valve and displacement of the pump body 10 due to inadequate pressing or displacement of the pump body 10.

[0061] During the pressing process of the pump body 10, in this embodiment, the sleeve 41 is designed so that when the multiple pressure rods 6 touch the pump body 10, they only achieve preliminary positioning and do not achieve pressing. Only when the pressure plate 4 moves downward and drives the sleeve 41 to move until the top of the pressure rod 6 abuts against the lower surface of the pressure plate 4 will the pump body 10 be truly pressed. This process allows the bottom end of the pressure rod 6 (i.e., the pressure head 61) to first contact the pump body 10, then find the pressing position, and finally press the pump body 10, so as to achieve comprehensive and accurate pressing of the pump body 10, ensure the tightness of the pump oil chamber 101 seal, and help improve the accuracy of the pressure test of the pressure regulating valve.

[0062] This embodiment allows the pump body 10 to achieve upper and lower sealing of the pump oil chamber 101 through the upper sealing gasket 51 and the lower sealing gasket 21 without installing the oil pump structure. The oil inlet channel 102 of the pump body 10 is sealed by a side-blocking mechanism, and the oil outlet channel 103 of the pump body 10 is sealed by a sealing ring on the test bench 2. A pressurized gas with continuously increasing pressure is supplied to the pump oil chamber 101 through a pressure regulating module, thus facilitating the pressure opening test of the pressure regulating valve before the oil pump assembly is completed. After the pressure opening test of the pressure regulating valve is completed, the inner rotor 20 of the oil pump structure and... The outer rotor 30 is installed into the pump oil chamber 101. After the inner rotor 20 and outer rotor 30 of the pump oil structure are installed, the height difference detection device is used to detect the height difference between the end face of the inner rotor 20 and the end face of the pump oil chamber 101, as well as the height difference between the end face of the outer rotor 30 and the end face of the pump oil chamber 101. Compared with the prior art, this embodiment realizes timely detection and processing of the quality of the pump body 10. It can also realize the opening pressure test of the pressure regulating valve even when the pump oil structure is not installed in the pump oil chamber 101 of the pump body 10, completely avoiding the situation where the performance of the pump oil structure is affected by high pressure testing.

[0063] In addition, as the pressure in the pump oil chamber 101 continuously increases, the pressure sensor, located on the connecting pipe between the proportional valve and the air intake channel 22, effectively collects the pressure data of the pump oil chamber 101 in real time. The control module saves the collected pressure data in real time and can establish a pressure curve that changes over time based on the pressure data. This enables process recording and monitoring of the pressure test process. Furthermore, the control module controls the air pressure regulating module to continuously increase the test air pressure supplied to the pump oil chamber 101 in a gradient manner. The control module also automatically determines the inflection point based on the change in the pressure curve and automatically judges whether the opening pressure of the pressure regulating valve is qualified based on the air pressure value at the inflection point. If the pressure is deemed unqualified, an alarm is automatically issued, greatly improving the degree of automation.

[0064] Example 2

[0065] Example 2 further specifies the height detection device based on Example 1, combining... Figures 8 to 11 The height difference detection device includes a workbench 8, a displacement sensor 40, a controller, and a mover 9 that drives the displacement sensor 40 to move in space. The displacement sensor 40 is connected to the output end of the mover 9. Both the displacement sensor 40 and the mover 9 are connected to the controller. The controller is used to control the mover 9 to drive the displacement sensor 40 to move in space. The controller is used to store the height data collected by the displacement sensor 40. The controller is connected to a second display.

[0066] The mover 9 employs a three-dimensional motion module, which is used by the displacement sensor 40 to move along the X, Y, and Z axes. In this embodiment, the three-dimensional motion module includes an X-axis linear module, a Y-axis linear module, and a lifter 91. The X-axis linear module is fixedly connected to the output end of the Y-axis linear module, and the lifter 91 is fixedly connected to the output end of the X-axis linear module. In this embodiment, the lifter 91 is a cylinder. Stroke limit switches are installed on the X-axis linear module, the Y-axis linear module, and the lifter 91 to reduce the probability that the displacement sensor 40 will be moved beyond its stroke range and collide with other objects.

[0067] The housing of the lifting device 91 is integrally formed with a guide rail. The output end of the lifting device 91 is fixedly connected to the lifting plate 92. The lifting plate 92 is vertically slidably connected to the guide rail. The displacement sensor 40 is fixedly connected to the lifting plate 92 by a clamping block.

[0068] A positioning block 81 is fixed on the workbench 8 by screws. The positioning block 81 is in concave-convex fit with the pump body 10. The positioning block 81 includes an integrally formed guide part 811 and a positioning part 812. The guide part 811 is located above the positioning part 812. The positioning part 812 is in concave-convex fit with the pump body 10. A control switch 83 is installed on the positioning part 812 of one of the positioning blocks 81. The control switch 83 is connected to the controller. After the control switch 83 is triggered, the controller receives the signal that the control switch 83 has been triggered and controls the mover 9 to drive the displacement sensor 40 to collect height data.

[0069] The workbench 8 is also equipped with a standard block 82 for calibrating the displacement sensor 40. In this embodiment, the displacement sensor 40 adopts a pneumatic inductive sensing head.

[0070] The controller controls the displacement sensor 40 to collect the height data of four test points on the end face of the pump oil chamber 101 of the pump body 10. The four test points are divided into two groups, and the two test points in each group are located on both sides of the pump oil chamber 101 of the pump body 10. The controller establishes a reference plane based on the height data collected on the end face of the pump oil chamber 101.

[0071] The controller controls the mover 9 to move and controls the displacement sensor 40 to collect height data from four test points on the end face of the outer rotor 30 and four test points on the end face of the inner rotor 20. The four test points on the end face of both the outer rotor 30 and the inner rotor 20 are divided into two groups. The line connecting each group of test points on the end face of the inner rotor 20, the line connecting each group of test points on the end face of the outer rotor 30, and the line connecting one group of test points on the end face of the pump body 10's oil chamber 101 are on the same straight line. When the controller controls the displacement sensor 40 to collect height data, it first completes the collection of height data from the four test points on the end faces of the inner rotor 20 and the outer rotor 30 that are on the same straight line. Then, the controller controls the mover 9 to move to the straight line containing the remaining test points on the end faces of the inner rotor 20 and the outer rotor 30 to facilitate the collection of height data from the four test points on the other straight line. By first completing the height data collection from the test points on one straight line and then completing the height data collection from the test points on the other straight line, that is... Figure 11 First, height data at points ①②③④ on the rotor end face (end face of inner rotor 20 and end face of outer rotor 30) is collected. Then, height data at points ⑤⑥⑦⑧ on the rotor end face is collected. This allows the displacement sensor 40 to easily collect height data at all test points as the mover 9 moves along two straight lines. This minimizes the moving path length of the output end of the mover 9 (i.e., the lifting plate 92 of the mover 9), improving the efficiency of height data collection and contributing to energy conservation and environmental protection.

[0072] The controller receives height data collected from the end face of the outer rotor 30 and the end face of the inner rotor 20, and compares each height data with a reference plane to obtain the height difference between each test point on the end face of the outer rotor 30 and the reference plane, and the height difference between each test point on the end face of the inner rotor 20 and the reference plane. The controller issues an alarm when the height difference between the test point on the end face of the inner rotor 20 and the reference plane, or the height difference between the test point on the end face of the outer rotor 30 and the reference plane, exceeds a preset height difference range. The controller displays the height difference between each test point and the reference plane on a second display.

[0073] The specific implementation process is as follows:

[0074] In this embodiment, before detecting the height difference of the oil pump, the displacement sensor 40 is calibrated using the standard block 82.

[0075] When testing the oil pump, the pump body 10, which contains the inner rotor 20 and the outer rotor 30, is first moved to the top of the workbench 8. Then, the pump body 10 slides down from the guide part 811 of the positioning block 81 onto the positioning part 812 of the positioning block 81, achieving accurate placement of the pump body 10. Simultaneously, the pump body 10 automatically triggers the control switch 83. The controller receives the signal that the control switch 83 has been triggered, and thus controls the mover 9 to start driving the displacement sensor 40 to collect data. During data collection, the mover 9 drives the displacement sensor 40 to monitor the end face of the inner rotor 20, the end face of the outer rotor 30, and the end of the pumping chamber 101 of the pump body 10. Height data is collected from multiple test points on the surface. The displacement sensor 40 transmits the collected height data to the controller. The controller stores the height data and establishes a reference plane based on the height data collected at the end face of the pump oil chamber 101. Then, the controller compares each height data collected at the end face of the outer rotor 30 and the end face of the inner rotor 20 with the reference plane to obtain the height difference between the test point on the end face of the outer rotor 30 and the reference plane, and the height difference between the test point on the end face of the inner rotor 20 and the reference plane. When the height difference calculated by the controller exceeds the preset height difference range, the controller issues an alarm signal to remind the staff.

[0076] This embodiment, through the cooperation of a displacement sensor 40, a mover 9, and a controller, completes the acquisition of height data and determination of height difference for the entire oil pump, ensuring the consistency and reliability of data acquisition and improving the accuracy of height difference detection.

[0077] This embodiment, through the setting of the controller and the mover 9, enables the system to detect the height difference between the end face of the inner rotor 20, the end face of the outer rotor 30, and the end face of the pump body 10 oil chamber 101 of oil pumps of different sizes and models, thereby improving the practicality of the detection system.

[0078] In addition, this embodiment controls the mover 9 and displacement sensor 40 through the controller, so that the height data of all test points can be collected automatically. At the same time, a reference plane is established for the collected data, and the height difference between the end face of the outer rotor 30 and the reference plane and the height difference between the end face of the inner rotor 20 and the reference plane are determined based on the established reference plane, which further improves the automation level of this detection system.

[0079] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for detecting the quality of an oil pump, which requires a pressure testing device and a height difference detecting device, the pressure testing device comprising a testing table and a pressing mechanism, characterized in that: The pressure testing device is located in the front process of the height difference detection device, the pressing mechanism comprises a pressing plate, a pressing disc connected to the pressing plate and a plurality of pressing rods, the plurality of pressing rods can abut against different positions of the pump body, the bottom of the pressing disc is provided with an upper sealing gasket, the testing table is provided with a lower sealing gasket, and the upper sealing gasket and the lower sealing gasket can seal the upper and lower end faces of the pump oil cavity; The height difference detection device comprises a workbench, a displacement sensor, a controller and a mover for driving the displacement sensor to move in space, the displacement sensor is connected to the output end of the mover, and the displacement sensor and the mover are connected to the controller; the controller is used for controlling the mover to drive the displacement sensor to move in space, and the number of displacement sensors is one. The controller controls the displacement sensor to collect height data of a plurality of test points on the end face of the pump oil cavity, and establishes a reference plane based on the received height data collected on the end face of the pump oil cavity; the controller controls the mover to move and controls the displacement sensor to collect height data of a plurality of test points on the end face of the outer rotor and height data of a plurality of test points on the end face of the inner rotor, and the controller receives the height data collected on the end face of the outer rotor and the end face of the inner rotor and compares each height data with the reference plane to obtain the height difference between the test points on the end face of the outer rotor and the reference plane and the height difference between the test points on the end face of the inner rotor and the reference plane. The pressure testing device further comprises a gas pressure adjusting module, a pressure sensor and a control module, the gas pressure adjusting module is used for providing gas with pressure to the pump oil cavity, the pressure sensor is connected between the gas pressure adjusting module and the pump oil cavity, and the pressure sensor is used for collecting pressure data of the pump oil cavity; the gas pressure adjusting module and the pressure sensor are connected to the control module, the control module controls the gas pressure adjusting module to provide gas with increasing pressure to the pump oil cavity, the control module receives and stores the pressure data from the pressure sensor, the control module establishes a pressure curve changing with time based on the pressure data, the control module judges the inflection point on the pressure curve according to the pressure curve data, and the pressure corresponding to the inflection point is determined as the opening pressure of the pressure regulating valve. The testing table is further provided with a side blocking mechanism, the side blocking mechanism comprises a pusher and a moving block fixed to the output end of the pusher, the moving block is provided with a sealing ring, the sealing ring can abut against the side face of the pump body, and the sealing ring on the moving block can block the channel communicated with the pump oil cavity formed in the side face of the pump body. By closing the oil inlet channel of the pump body through the side blocking mechanism, closing the oil outlet channel outlet of the pump body through the sealing ring on the testing table and providing the pump oil cavity with gas with pressure and increasing pressure through the gas pressure adjusting module, the opening pressure test of the pressure regulating valve can be realized before the oil pump is assembled.

2. The method of claim 1, wherein: After the pressure opening test of the pressure regulating valve is completed, the inner rotor and the outer rotor are installed into the pump oil cavity, and the height difference between the end face of the inner rotor and the end face of the pump oil cavity and the height difference between the end face of the outer rotor and the end face of the pump oil cavity are detected by using the height difference detection device after the installation of the inner rotor and the outer rotor is completed.

3. The method of claim 1 or 2, wherein: The gas pressure adjusting module comprises a gas storage device and a pressure booster, the gas storage device is used for storing compressed gas, the input end of the pressure booster is communicated with the output end of the gas storage device, and the output end of the pressure booster is communicated with the pump oil cavity.

4. The method of claim 3, wherein: The booster is connected with a proportional valve, the output of the proportional valve is communicated with the air inlet channel through a pipeline, a pressure sensor is installed on the pipeline communicated with the air inlet channel, the booster and the proportional valve are connected with the control module, and the pressure sent to the pump oil cavity by the booster is boosted with the same gradient through the proportional valve.

5. The method of claim 1-2, wherein: The sleeve is fixedly connected to the pressing plate, and the pressing rod is vertically and slidingly connected to the sleeve.

6. The method of claim 5, wherein: During the pressing process of the pump body, the multiple pressing rods only achieve preliminary positioning when touching the pump body, and the pump body is not pressed tightly until the pressing plate moves downward to drive the sleeve to move until the top of the pressing rod abuts against the lower surface of the pressing plate.

7. The method of claim 1-2, wherein: The workbench is provided with a positioning block, the positioning block is in engagement with the pump body, and the positioning block is provided with a control switch connected with the controller.

8. The method of claim 7, wherein: During the detection of the oil pump, the pump body provided with the inner rotor and the outer rotor is moved above the workbench, and then the pump body is slid downward from the guide portion of the positioning block to the positioning portion of the positioning block, so that the pump body is accurately placed, and the pump body automatically triggers the control switch when the pump body is placed, and the controller receives the signal that the control switch is triggered, and then the controller controls the movement device to drive the displacement sensor to collect data.

9. The method of claim 1-2, wherein: Before the height difference detection of the oil pump, the displacement sensor is calibrated by using the standard block.

10. The method of claim 1-2, wherein: When the height difference calculated by the controller exceeds the preset height difference range of the controller, the controller sends an alarm signal to remind the worker.

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