A method for detecting a height difference of an oil pump

Abstract

The application relates to the technical field of product detection, and particularly discloses a height difference detection method for an oil pump, a pressure test device is located in a front process of a height difference detection device; 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 an output end of the mover, the displacement sensor and the mover are connected with the controller, the controller is used for controlling the mover to drive the displacement sensor to move in space, and the number of the displacement sensors is one; after pressure opening test of a pressure regulating valve is completed, inner and outer rotors of a pump oil structure are installed into a pump oil cavity, and then the height difference detection device is used to detect the height difference between an end surface of the inner rotor and an end surface of the pump oil cavity and the height difference between an end surface of the outer rotor and the end surface of the pump oil cavity after the inner and outer rotors of the pump oil structure are installed. The scheme is used to improve the automation degree of height difference detection and the accuracy of height difference detection.

Description

[0001] The present application is a divisional application of the patent application with application number 2021115539109, titled "A machine oil pump quality detection system", and filed on December 17, 2021. TECHNICAL FIELD

[0002] The present application relates to the technical field of product detection, in particular to a height difference detection method for a machine oil pump. BACKGROUND

[0003] A diesel (or gasoline) engine is generally equipped with a machine oil pump, which includes a pump body, a pump oil structure installed in a pump oil cavity of the pump body, and a pump cover for sealing the pump oil cavity. The machine oil pump sucks machine oil into the pump oil cavity, and then discharges the sucked machine oil under pressure to the engine oil filter and various lubricating oil channels, thereby achieving the functions of lubrication, cooling, corrosion prevention, and shock absorption for various transmission pairs of the engine.

[0004] The machine oil pump for a large-flow diesel (or gasoline) engine is equipped with a safety protection component, a pressure regulating valve (also known as a safety valve or pressure limiting valve), and a pump oil cavity of the pump body is connected with a pressure relief passage, and the pressure regulating valve is installed on the pressure relief passage. The pressure regulating valve is used to maintain the normal oil pressure in the engine lubricating oil channel to avoid excessive or insufficient oil pressure in the engine system, which may cause oil leakage or lack of lubrication in various parts of the engine, and further cause abnormal conditions such as cooling, cleaning, sealing, corrosion prevention, and shock absorption of the engine.

[0005] The oil suction and discharge performance of the machine oil pump is affected not only by the shape and structure of the pump oil structure itself, but also by the gap between the pump oil structure and the pump oil cavity of the pump body. For example, the tooth shape, shaping, and machining parameters of the inner rotor and outer rotor of the pump oil structure affect the oil suction and discharge performance, and the matching clearance between the inner rotor, outer rotor, and pump cover also has a great influence on the oil suction and discharge performance. The size of the matching clearance depends on the size difference in height between the inner rotor, outer rotor, and pump oil cavity.

[0006] In the prior art, in order to improve the product quality of the machine oil pump, after the inner rotor and outer rotor are installed on the machine 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 cavity, and the height difference between the end face of the outer rotor and the end face of the pump oil cavity. After the height difference detection is qualified, the pump cover is used to seal the pump oil cavity, and the opening pressure of the pressure regulating valve is tested after the assembly of the machine oil pump is completed.

[0007] The opening pressure of the pressure regulating valve is detected by using a gas measurement method, specifically, the oil pump is placed on a test bench, the oil pump is pressed by a pressing mechanism at the top of the pump body, and then high-pressure gas is filled into the pump oil chamber of the oil pump until the pressure regulating valve connected with the pump oil chamber is automatically opened, and the pressure at the time of automatic opening of the pressure regulating valve is the opening pressure of the pressure regulating valve. Although this test makes the detection of the opening pressure of the pressure regulating valve simple, efficient and low in cost, in the gas measurement process, the pump oil chamber continuously receives high-pressure gas, and the pump oil chamber is connected with the oil inlet channel, the oil outlet channel and the pressure relief channel for installing the pressure regulating valve. The existing pressing mechanism only presses the upper end of the pump oil chamber and the corner of the pump body, but under high pressure, the oil pump is prone to displacement, which affects the accuracy of the opening pressure test of the pressure regulating valve, and the displacement of the oil pump under high pressure also brings safety hazards. In addition, in the gas measurement process, the pressure in the pump oil chamber is continuously rising, and the pump oil structure is installed in the pump oil chamber. When the pump oil structure is subjected to high-pressure pressure test, the performance of the pump oil structure will be affected. SUMMARY

[0008] The present application aims to provide an oil pump quality detection system to solve the problem of affecting the performance of the pump oil structure in the pump oil chamber of the pump body caused by high pressure of high-pressure gas in the opening pressure test process of the pressure regulating valve in the prior art.

[0009] In order to achieve the above-mentioned purpose, the basic scheme of the present application is as follows:

[0010] An oil pump quality detection system comprises a pressure test device and a height difference detection device, the pressure test device comprises a test bench and a pressing mechanism, the pressure test 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 different positions of the pump body, the bottom of the pressing disc is provided with an upper sealing gasket, and the test bench 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 chamber of the pump body.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] When the scheme is adopted, the pressure rod of the pressing mechanism is used to press the pump body on the test table, while the pump body is pressed on the test table, the pressure plate with the upper sealing gasket on the pressing mechanism is closed from one end face of the pump oil cavity of the pump body, and the lower sealing gasket on the test table closes the other end face of the pump oil cavity, so that the pump oil cavity of the pump body can be tested for the opening pressure of the pressure regulating valve before the pump oil structure is installed, that is, the opening pressure test of the pressure regulating valve can be completed before the pump oil structure is installed in the pump oil cavity, and after the pressure regulating valve pressure opening test is completed, the inner rotor and the outer rotor of the pump oil structure are installed in the pump oil cavity, and then 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 oil cavity, and the height difference between the end face of the outer rotor and the end face of the pump oil cavity. Compared with the prior art, the scheme realizes timely detection and processing of the quality of the pump body, and can realize the opening pressure test of the pressure regulating valve without installing the pump oil structure in the pump oil cavity, completely avoiding the influence of high pressure test on the performance of the pump oil structure.

[0013] Further, the plurality of pressure rods can be pressed on both sides of the channel communicating with the pump oil cavity of the pump body.

[0014] Beneficial effect: when the scheme is adopted, the pump body is placed on the test table, and the pump body is pressed by the pressing mechanism above the test table. When pressing, the top of the pump oil cavity of the pump body is pressed by the pressure plate, and the channels communicating with the pump oil cavity of the pump body are pressed on both sides by the plurality of pressure rods. In addition to the pump oil cavity being pressed, other channels communicating with the pump oil cavity are also pressed, ensuring that the entire pump body is fully pressed, avoiding the problem of inaccurate opening pressure test of the pressure regulating valve and safety hazards caused by displacement of the pump body due to incomplete pressing.

[0015] Further, the test table is provided with a limiting column and a positioning piece, the limiting column can be inserted into the mounting hole of the pump body, and the positioning piece is attached to the surface of the pump body.

[0016] Beneficial effect: through the setting of the limiting column and the positioning piece, the position of the pump body during the test process is further limited, further ensuring that the pump body does not shift during the opening pressure test of the pressure regulating valve; in addition, the setting of the limiting column and the positioning piece makes the placement of the pump body more rapid and accurate. When placing, the pump body is first directly abutted against the positioning piece, and then the pump body can be quickly placed downward. The mounting hole of the pump body is automatically sleeved into the limiting column during the downward placement of the pump body, completing the rapid and accurate positioning of the pump body, which is beneficial to improve the detection efficiency.

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

[0018] Beneficial effects: In actual use, the lower sealing gasket will lift the pump body upwards when it is not subjected to external force from the pressing mechanism, resulting in the pump body being inclined when it is just placed on the test bench. If the fast pressing method is directly used, the pump body may be pressed when it is in an inclined state, i.e., the position is not adjusted, which may cause the pump oil cavity to be not tightly sealed and affect the detection accuracy. The sleeve is arranged in the present scheme, so that the plurality of pressing rods only achieve preliminary positioning when they touch the pump body and do not achieve pressing. Only when the pressing plate is continuously moved downwards to drive the sleeve to move until the top of the pressing rod abuts against the lower surface of the pressing plate, the pump body can be truly pressed. This process enables the bottom end of the pressing rod to first contact the pump body, then accurately locate the pressing position, and finally press the pump body, so that the pump body is accurately pressed in an all-round manner, the tightness of the pump oil cavity is ensured, and the accuracy of the pressure test of the pressure regulating valve is improved.

[0019] Further, the pressing mechanism comprises a driver for driving the pressing plate to move up and down, the driver comprises a main driver and a sub-driver located on both sides of the main driver, and the output ends of the main driver and the sub-driver are fixedly connected with the pressing plate, and the output end of the main driver is fixedly connected in the middle of the pressing plate.

[0020] Beneficial effects: The middle part and the two side parts of the pressing plate are driven by the main driver and the sub-driver, so that the pressing plate is more uniformly stressed.

[0021] Further, the pressure test device further comprises an air pressure adjusting module, a pressure sensor and a control module, the air pressure adjusting module is used to provide the pump oil cavity with gas with pressure, the pressure sensor is connected between the air pressure adjusting module and the pump oil cavity, and the pressure sensor is used to collect pressure data of the pump oil cavity; the air pressure adjusting module and the pressure sensor are connected with the control module, the control module controls the air pressure adjusting module to provide the pump oil cavity with gas with pressure that is continuously increased, 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 an 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.

[0022] Beneficial effects: The pressure data of the pump oil cavity is collected in real time by the pressure sensor, and the collected pressure data is saved in real time by the control module. The control module can establish a pressure curve changing with time based on the pressure data, so that the process recording and process monitoring of the pressure test process are realized. The control module controls the air pressure adjusting module to continuously increase the test air pressure sent to the pump oil cavity, and the control module automatically judges the inflection point according to the change of the pressure curve and automatically determines whether the opening pressure of the pressure regulating valve is qualified according to the air pressure value of the inflection point, so that the degree of automation is greatly improved.

[0023] Further, the height difference detection device comprises a workbench, a displacement sensor, a controller and a mover for moving the displacement sensor 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, and the controller is used for controlling the mover to move the displacement sensor in space.

[0024] Beneficial effects: when the scheme is adopted, the controller controls the mover to drive the displacement sensor to detect the heights of the inner rotor end face, the outer rotor end face and the pump oil cavity end face of the pump body, so that the height of different parts is detected by one displacement sensor, and the automation degree is improved; in addition, the controller and the mover are arranged, so that the height difference detection device can detect the height difference of the inner rotor, the outer rotor and the pump oil cavity end face of the pump body of different sizes and models, and the practicability of the detection system is improved.

[0025] Further, the controller controls the displacement sensor to collect height data of a plurality of test points on the pump oil cavity end face, and establishes a reference plane based on the received height data collected on the pump oil cavity end face; the controller controls the mover to move and controls the displacement sensor to collect height data of a plurality of test points on the outer rotor end face and height data of a plurality of test points on the inner rotor end face, and 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 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.

[0026] Beneficial effects: the controller controls the mover and the displacement sensor, so that the height data collection of all test points can be automatically performed, the reference plane is established based on the collected 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, and the automation degree of the detection system is further improved.

[0027] Further, the workbench is provided with a positioning block, and the positioning block is in concave-convex cooperation with the pump body.

[0028] Beneficial effects: the positioning block is arranged, so that the placement position of the pump body is fixed, and the pump body is conveniently and accurately placed on the specified position of the workbench.

[0029] Further, the positioning block is provided with a control switch, and the control switch is connected to the controller.

[0030] Beneficial effects: when the scheme is adopted, only when the pump body is placed on the positioning block, it means that it is placed in place, and the pump body is placed in place at the same time, and the control switch is automatically triggered, after the control switch is triggered, the controller receives the signal and controls the mover to start driving the displacement sensor to collect data, further improving the automation degree of the detection system. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a three-dimensional structural schematic view of the pressure testing device in embodiment one of the application.

[0032] Figure 2 It is a front view of Figure 1 .

[0033] Figure 3 It is a partial right view sectional view in Figure 1 .

[0034] Figure 4 It is a three-dimensional structural schematic view of the test bench in embodiment one of the application.

[0035] Figure 5 It is a three-dimensional structural schematic view of the pump body after being placed on the test bench in embodiment one of the application.

[0036] Figure 6 It is a three-dimensional structural schematic view of the pump body after being pressed by the pressure head and the pressing disc in Figure 5 .

[0037] Figure 7 It is a connection relationship diagram of the air pressure adjusting module and the test bench air inlet channel in embodiment one of the application.

[0038] Figure 8 It is a three-dimensional structural schematic view of the pressure testing device in embodiment two of the application.

[0039] Figure 9 It is a three-dimensional structural schematic view of the pump body after being placed in Figure 8 .

[0040] Figure 10 It is a three-dimensional structural schematic view of the lifter and the lifting plate after being separated in embodiment two of the application.

[0041] Figure 11 It is a schematic view of the displacement sensor collecting height data of the test point in embodiment two of the application. DETAILED DESCRIPTION

[0042] The following will be further described in detail through specific embodiments:

[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 attached document. 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 table 2 is provided with an air inlet channel 22, and the lower sealing pad 21 is provided with an air passing channel 23. One end of the air passing channel 23 is communicated with the air inlet channel 22, and the other end of the air passing channel 23 is capable of being communicated with the pump oil cavity 101. The upper surface of the test table 2 is fixedly connected with a limiting column 24 and a positioning member 25 through screws. The limiting column 24 is capable of being inserted into the mounting hole of the pump body 10, and the positioning member 25 is attached to the surface of the pump body 10 and is located on one side of the limiting column 24. The end of the air inlet channel 22, which is away from the air passing channel 23, is communicated with the air pressure adjusting module.

[0050] A plurality of sleeves 41 are fixedly connected to the pressing plate 4 through screws, and each pressing rod 6 corresponds to one sleeve 41. The pressing rod 6 is vertically and slidingly connected to the sleeve 41, and the top of the pressing rod 6 is capable of abutting against the pressing plate 4. A pressing head 61 is threadedly connected to the bottom end of the pressing rod 6. The pressing disc 5 comprises a connecting rod 52 and a pressing disc 53. The connecting rod 52 is vertically and slidingly connected to the corresponding sleeve 41, and the top of the connecting rod 52 is capable of abutting against the pressing plate 4. The pressing disc 53 is threadedly connected to the connecting rod 52, and the pressing disc 53 is capable of pressing the pump oil cavity 101. The upper sealing pad 51 is fixed to the bottom of the pressing disc 53. In this embodiment, the pressing plate 4 comprises an upper plate 42, a middle plate 43 and a lower plate 44 which are sequentially arranged from top to bottom. The middle plate 43 is clamped between the upper plate 42 and the lower plate 44, and the upper plate 42 is fixedly connected with the lower plate 44. The upper plate 42 is fixedly connected with the output end of the driver 3. The sleeve 41 is fixedly connected to the lower plate 44. The pressing rod 6 and the connecting rod 52 are capable of abutting against the middle plate 43 after being moved upward. The existence of the middle plate 43 facilitates the installation of the output end of the driver 3 and the installation of the sleeve 41, the connecting rod 52 and the pressing rod 6. In addition, when the middle plate 43 in the pressing plate 4 is damaged, only the middle plate 43 needs to be replaced, thereby reducing the replacement cost. In addition, the upper plate 42 and the lower plate 44 facilitate the disassembly and maintenance of the parts connected thereto.

[0051] The test table 2 is further provided with a side blocking mechanism. The side blocking mechanism comprises a pusher 7 and a moving block 71 fixed to the output end of the pusher 7. A sealing ring is installed on the moving block 71. The sealing ring is capable of abutting against the side surface of the pump body 10, and the sealing ring on the moving block 71 is capable of blocking the channel provided on the side surface of the pump body 10 and communicated with the pump oil cavity 101. In this embodiment, the channel provided on the side surface of the pump body 10 is an oil inlet channel 102, and the pusher 7 is a pneumatic cylinder.

[0052] In this embodiment, the outlet of the oil outlet channel 103 of the pump body 10 faces the test table 2. A sealing ring for sealing the outlet of the oil outlet channel 103 of the pump body 10 is installed on the test table 2.

[0053] In combination Figure 7The air pressure adjusting module and the pressure sensor are connected with the control module, the air pressure adjusting module is used for providing the pump oil cavity 101 with gas with pressure, the air pressure adjusting module comprises a gas storage device and a pressure booster, the gas storage device is used for storing compressed gas, in the embodiment, the gas storage device comprises an air compressor and a gas tank, the air compressor injects high-pressure air into the gas tank, the input end of the pressure booster is in communication with the output end of the gas storage device, the output end of the pressure booster is in communication with the pump oil cavity 101, a proportional valve is connected to the output end of the pressure booster, the output end of the proportional valve is in communication with the air inlet channel 22 through a pipeline, the pressure sensor is installed on the pipeline in communication with the proportional valve and the air inlet channel 22, the pressure sensor is used for collecting pressure data of the pump oil cavity 101, the pressure booster and the proportional valve are connected with the control module, and the pressure of the pressure booster sent to the pump oil cavity 101 is pressurized at the same gradient through the proportional valve.

[0054] The control module controls the air pressure adjusting module to provide the pump oil cavity 101 with gas with increasing pressure, receives and stores pressure data from the pressure sensor, establishes a pressure curve changing with time based on the pressure data, judges an inflection point on the pressure curve according to the pressure curve data, and determines that the pressure corresponding to the inflection point is the opening pressure of the pressure regulating valve, and issues an alarm when the pressure corresponding to the inflection point exceeds a preset qualified pressure range. The control module comprises a first display, and the first display can display the pressure curve.

[0055] The specific implementation process is as follows:

[0056] When the pressure regulating valve of the pump body 10 is tested by using the embodiment, the pump body 10 with the pressure regulating valve is first carried to the test table 2, when the pump body 10 is placed on the test table 2, the pump body 10 is directly abutted against the positioning member 25, then the pump body 10 can be quickly placed downward, and the mounting hole of the pump body 10 is automatically sleeved into the limiting column 24 during the downward placement of the pump body 10, so that the quick and accurate positioning of the pump body 10 is completed.

[0057] Then the pressing mechanism is started, so that the main drive 31 and the auxiliary drive 32 of the driver 3 drive the pressing plate 4 to move downwards, and then drive the pressing rods 6 and the connecting rods 52 sliding in the sleeve 41 to move downwards, the pressing plate 4 moves downwards to the contact of the pressing heads 61 at the ends of the pressing rods 6 with the pump body 10, and the contact of the pressing discs 53 at the ends of the connecting rods 52 and the upper sealing gaskets 51 with the pump body 10, the pressing plate 4 continues to be driven by the driver 3 to move downwards until the pressing rods 6 and the connecting rods 52 move along the sleeve 41 and abut against the pressing plate 4, and the pressing of the pump body 10 is completed. At the same time when the pressing of the pump body 10 is completed, the upper and lower end faces of the pump oil cavity 101 are blocked by the upper sealing gaskets 51 and the lower sealing gaskets 21 respectively; and because the outlet of the oil discharge passage 103 of the pump body 10 which communicates with the pump oil cavity 101 faces the test bench 2, and the sealing ring which blocks the outlet of the oil discharge passage 103 is installed on the test bench 2, the outlet of the oil discharge passage 103 of the pump body 10 is blocked.

[0058] The pusher 7 of the side blocking mechanism is started, so that the pusher 7 drives the moving blocks 71 to abut against the side edges of the pump body 10, and because the sealing rings which block the oil inlet passages 102 of the side edges of the pump body 10 are installed on the moving blocks 71, the openings of the oil inlet passages 102 of the pump body 10 are also blocked.

[0059] Finally, the control module controls the air pressure adjusting module to input high-pressure gas into the air inlet passage 22 of the test bench 2, and the pressure of the high-pressure gas is continuously increased in equal gradient by the pressure booster and the proportional valve, so that the high-pressure gas finally enters the sealed pump oil cavity 101 through the air inlet passage 22 and the air passage 23, and when the pressure in the pump oil cavity 101 exceeds the bearing capacity of the pressure regulating valve, the pressure regulating valve is automatically opened.

[0060] When the embodiment is adopted, the top of the pump oil cavity 101 is pressed and sealed by the pressing plate 5, and the passages which communicate with the pump oil cavity 101 are pressed on both sides by the plurality of pressing rods 6, so that in addition to the pump oil cavity 101 being pressed, other passages which simultaneously bear the high-pressure gas with the pump oil cavity 101 are also pressed one by one, which ensures that the entire pump body 10 is fully pressed, and avoids the problems of inaccurate pressure regulating valve opening pressure test and safety hazards caused by the displacement of the pump body 10 due to incomplete pressing or displacement of the pump body 10.

[0061] During the pressing of the pump body 10, the sleeve 41 is provided in the embodiment, so that when the plurality of pressing rods 6 touch the pump body 10, they only achieve preliminary positioning and do not achieve pressing, and only when the pressing plate 4 continuously moves downwards to drive the sleeve 41 to move until the top of the pressing rod 6 abuts against the lower surface of the pressing plate 4, the pump body 10 is truly abutted, the process makes the bottom end of the pressing rod 6 (i.e. the pressing head 61) first contact the pump body 10, then find the pressing position, and finally press the pump body 10, which realizes the full and accurate pressing of the pump body 10, ensures the tightness of the sealing of the pump oil cavity 101, and is conducive to improving the accuracy of the pressure test of the pressure regulating valve.

[0062] The embodiment enables the pump body 10 to realize the up and down sealing of the pump oil cavity 101 through the upper sealing gasket 51 and the lower sealing gasket 21 without installing the pump oil structure, to close the oil inlet channel 102 of the pump body 10 through the side blocking mechanism, to close the outlet of the oil outlet channel 103 of the pump body 10 through the sealing ring on the test bench 2, to provide the pump oil cavity 101 with gas with pressure and increasing pressure through the air pressure adjusting module, and to facilitate the opening pressure test of the pressure regulating valve before the oil pump is assembled; after the opening pressure test of the pressure regulating valve is completed, the inner rotor 20 and the outer rotor 30 of the pump oil structure are installed into the pump oil cavity 101, and the height difference between the end face of the inner rotor 20 and the end face of the pump oil cavity 101 and the height difference between the end face of the outer rotor 30 and the end face of the pump oil cavity 101 are detected by using the height difference detection device; compared with the prior art, the embodiment realizes the timely detection and processing of the quality of the pump body 10, and can realize the opening pressure test of the pressure regulating valve without installing the pump oil structure in the pump oil cavity 101 of the pump body 10, thereby completely avoiding the influence of high-pressure test on the performance of the pump oil structure.

[0063] In addition, in the process of continuously rising the pressure in the pump oil cavity 101, the pressure sensor is arranged on the connecting pipeline between the proportional valve and the air inlet channel 22, the pressure sensor is equivalent to collecting the pressure data of the pump oil cavity 101 in real time, the control module saves the collected pressure data in real time, the control module can establish a pressure curve changing with time based on the pressure data, realizes the process recording and process monitoring of the pressure test process, and through the control module, the test air pressure continuously increasing to the pump oil cavity 101 in the form of equal gradient by the air pressure adjusting module and the control module automatically judging the inflection point according to the change of the pressure curve and automatically determining whether the opening pressure of the pressure regulating valve is qualified according to the air pressure value of the inflection point, and automatically issuing an alarm when it is determined to be unqualified, the degree of automation is greatly improved.

[0064] Embodiment two

[0065] Embodiment two is based on embodiment one and specifically realizes the height detection device, which is combined with Figures 8 to 11 The height difference detection device comprises a workbench 8, a displacement sensor 40, a controller and a mover 9 for driving the displacement sensor 40 to move in space, the displacement sensor 40 is connected to the output end of the mover 9, the displacement sensor 40 and the mover 9 are connected with the controller, the controller is used for controlling the mover 9 to drive the displacement sensor 40 to move in space, the controller is used for storing the height data collected by the displacement sensor 40, and the controller is connected with a second display.

[0066] The mover 9 adopts a three-dimensional moving module, which is used for moving the displacement sensor 40 to realize the movement of the X-axis, the Y-axis and the Z-axis. In the embodiment, the three-dimensional moving module comprises 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. The lifter 91 is fixedly connected to the output end of the X-axis linear module. In the embodiment, the lifter 91 adopts a pneumatic cylinder. The X-axis linear module, the Y-axis linear module and the lifter 91 are all provided with stroke limit switches, so as to reduce the probability that the displacement sensor 40 is driven to beyond the stroke range and collides with other objects.

[0067] The lifter 91 is integrally formed with a guide rail. The output end of the lifter 91 is fixedly connected with a lifting plate 92. The lifting plate 92 is vertically and slidingly connected to the guide rail. The displacement sensor 40 is fixedly connected to the lifting plate 92 through the installed clamping block.

[0068] The workbench 8 is provided with a positioning block 81 fixed through screws. The positioning block 81 is in concave-convex cooperation with the pump body 10. The positioning block 81 comprises an integral guide portion 811 and a positioning portion 812. The guide portion 811 is located above the positioning portion 812. The positioning portion 812 is in concave-convex cooperation with the pump body 10. The positioning portion 812 of one of the positioning blocks 81 is provided with a control switch 83. The control switch 83 is connected with the controller. After the control switch 83 is triggered, the controller receives the signal that the control switch 83 is triggered and controls the mover 9 to drive the displacement sensor 40 to collect height data.

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

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

[0071] The controller controls the mover 9 to move and controls the displacement sensor 40 to collect height data of four test points on the end surface of the outer rotor 30 and height data of four test points on the end surface of the inner rotor 20. The four test points on the end surface of the outer rotor 30 and the four test points on the end surface of the inner rotor 20 are each divided into two groups. The line connecting each group of test points on the end surface of the inner rotor 20 and the line connecting each group of test points on the end surface of the outer rotor 30 are on the same straight line as the line connecting one group of test points on the end surface of the pump oil cavity 101 of the pump body 10. When the controller controls the displacement sensor 40 to collect height data, the four test points on the end surface of the inner rotor 20 and the end surface of the outer rotor 30 that are on the same straight line are collected first. Then, the controller controls the mover 9 to move to the straight line on which the remaining test points on the end surface of the inner rotor 20 and the end surface of the outer rotor 30 are located, so as to facilitate the collection of height data of the four test points on the other straight line one by one. The height data of the test points on one straight line is collected first, and then the height data of the test points on the other straight line is collected, that is, as shown in Figure 11 the drawings, the height data of the test points at ①, ②, ③ and ④ on the end surface of the rotor (the end surface of the inner rotor 20 and the end surface of the outer rotor 30) is collected first, and then the height data of the test points at ⑤, ⑥, ⑦ and ⑧ on the end surface of the rotor is collected. In this way, the movement of the mover 9 on the two straight lines facilitates the displacement sensor 40 to collect the height data of all the test points. The length of the movement path of the output end of the mover 9 (i.e., the lifting plate 92 of the mover 9) is the shortest, which improves the efficiency of height data collection and is conducive to energy saving and environmental protection.

[0072] The controller receives the height data collected on the end surface of the outer rotor 30 and the end surface of the inner rotor 20 and compares each height data with the reference plane to obtain the height difference between each test point on the end surface of the outer rotor 30 and the reference plane and the height difference between each test point on the end surface of the inner rotor 20 and the reference plane. The controller is configured to issue an alarm when the height difference between the test points on the end surface of the inner rotor 20 and the reference plane and the height difference between the test points on the end surface of the outer rotor 30 and the reference plane exceed a preset height difference range. The controller displays the height difference between each test point and the reference plane on the second display.

[0073] The specific implementation process is as follows:

[0074] When the embodiment is used, before the height difference detection of the oil pump, the standard block 82 is used to calibrate the displacement sensor 40.

[0075] In the detection of the oil pump, the pump body 10 with the inner rotor 20 and the outer rotor 30 is first moved above the workbench 8, and then the pump body 10 is slid downward from the guide part 811 of the positioning block 81 to the positioning part 812 of the positioning block 81, so that the pump body 10 is accurately placed, and at the same time that the pump body 10 is placed, the pump body 10 automatically triggers the control switch 83, and the controller receives the signal that the control switch 83 is triggered, that is, the controller controls the mover 9 to drive the displacement sensor 40 to collect data. During data collection, the mover 9 drives the displacement sensor 40 to collect height data of multiple test points on the end face of the inner rotor 20, the end face of the outer rotor 30 and the end face of the pump oil cavity 101 of the pump body 10, and the displacement sensor 40 transmits the collected height data to the controller, and the controller stores the height data and establishes a reference plane based on the height data collected on the end face of the pump oil cavity 101; then the controller compares each height data collected on 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 points on the end face of the outer rotor 30 and the reference plane and the height difference between the test points 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 preset by the controller, the controller sends an alarm signal to remind the worker.

[0076] The embodiment completes the height data collection and height difference determination on the entire oil pump through the cooperation of the displacement sensor 40, the mover 9 and the controller, ensures the consistency and reliability of data collection, and is beneficial to improving the accuracy of height difference detection.

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

[0078] In addition, the embodiment enables the height data collection of all test points to be automatically performed through the control of the controller on the mover 9 and the displacement sensor 40, establishes a reference plane based on the collected data, and determines 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 based on the established reference plane, thereby further improving the automation degree of the detection system.

[0079] The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A method for detecting the height difference 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 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; After the pressure regulating valve pressure opening test is completed, the inner rotor and the outer rotor of the pump oil structure are installed into the pump oil cavity, and then 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 oil cavity and the height difference between the end face of the outer rotor and the end face of the pump oil cavity.

2. The method of detecting a height difference of an oil pump according to claim 1, characterized by: The workbench is provided with a positioning block, the positioning block is matched with the pump body in a concave-convex manner, and the positioning block is provided with a control switch connected to the controller.

3. The method of detecting a height difference of an oil pump according to claim 2, characterized by: During the detection of the oil pump, the pump body provided with the inner rotor and the outer rotor is first moved above the workbench, and then the pump body is slid downward from the guide part of the positioning block to the positioning part 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, the controller receives the signal that the control switch is triggered, and the mover starts to drive the displacement sensor to collect data.

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

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

6. The method of detecting a height difference of an oil pump according to any one of claims 1 to 5, characterized in that: The controller controls the displacement sensor to collect height data of four test points on the end face of the pump oil cavity of the pump body, the four test points are divided into two groups, and two test points in each group are located on two sides of the pump oil cavity of the pump body.

7. The method of detecting a height difference of an oil pump according to claim 6, characterized by: The controller controls the mover to move and controls the displacement sensor to collect height data of four test points on the end face of the outer rotor and height data of four test points on the end face of the inner rotor, the four test points on the end face of the outer rotor and the four test points on the end face of the inner rotor are each divided into two groups, and the connecting line of each group of test points on the end face of the inner rotor and the connecting line of each group of test points on the end face of the outer rotor are located on the same straight line as the connecting line of one group of test points on the end face of the pump oil cavity of the pump body; when the controller controls the displacement sensor to collect height data, the four test points on the end face of the inner rotor and the end face of the outer rotor located on the same straight line are completed first, and then the mover is moved to the straight line on which the remaining test points on the end face of the inner rotor and the end face of the outer rotor are located by the controller.

8. The method of detecting a height difference of an oil pump according to claim 7, characterized by: By completing the collection of height data of the test points on one straight line first and then completing the collection of height data of the test points on the other straight line, the movement of the mover on the two straight lines can facilitate the displacement sensor to complete the collection of height data of all the test points.

9. The method of detecting a height difference of an oil pump according to any one of claims 1 to 5, 7 to 8, characterized by: A plurality of the pressing rods can be pressed on both sides of the channel communicating with the pump oil cavity of the pump body.

10. The method of detecting a height difference of an oil pump according to claim 9, characterized by: The test bench is provided with a limiting column and a positioning member, the limiting column can be inserted into the mounting hole of the pump body, and the positioning member is attached to the surface of the pump body.

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