Pressure test system

Abstract

The present invention relates to the field of product testing technology, and specifically discloses a pressure test system, including a test bench, a clamping mechanism, an air pressure regulating module, a pressure sensor and a control module. The clamping mechanism includes a pressure plate and a pressure plate and a pressure rod connected to the pressure plate. An upper sealing gasket is provided at the bottom of the pressure plate, and a lower sealing gasket is provided on the test bench. The upper sealing gasket and the lower sealing gasket can seal the upper and lower end surfaces of the workpiece pump oil chamber. The pressure sensor is used to collect pressure data of the pump oil chamber, and the control module controls the air pressure regulating module to provide gas with increasing pressure to the pump oil chamber. The control module establishes a pressure curve that changes with time based on the pressure data, and the control module determines the inflection point on the pressure curve and identifies the corresponding pressure at the inflection point. This solution solves the problem in the prior art that the high pressure of the high-pressure gas affects the performance of the pump oil structure in the workpiece pump oil chamber during the pressure test of the pressure regulating valve opening, and achieves the purpose of automatic detection of the pressure regulating valve opening pressure.

Description

Technical Field

[0001] The invention relates to the technical field of product detection, in particular to a pressure testing system. Background Art

[0002] Diesel (or gasoline) engines are generally equipped with an oil pump, which includes a pump body and an oil pumping structure installed in the oil pumping chamber of the pump body. The oil is sucked into the oil pumping chamber of the oil pump through the oil pump, and then the sucked oil is discharged into the engine's oil filter and various lubrication oil channels under pressure, thereby realizing the functions of lubrication, friction reduction, cooling, corrosion protection, and shock absorption for various transmission pairs of the engine.

[0003] The oil pumps equipped with large-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 oil chamber of the pump body is connected to a pressure relief channel, and a pressure regulating valve is installed on the pressure relief channel). The pressure regulating valve is used to maintain normal oil pressure in the engine lubrication oil channel to avoid excessively high or low 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 in the engine's cooling, cleaning, sealing, corrosion protection, shock absorption, etc.

[0004] Traditionally, the pressure detection of the pressure regulating valve is simulated by injecting kerosene, diesel or a mixed oil into the oil pump to test the opening pressure of the pressure regulating valve. However, the traditional method not only wastes the test oil, but also takes a long time to test, resulting in high cost and low efficiency of the test. In addition, the tested oil pump needs to be drained, which further increases the cost of the pressure regulating valve opening pressure test. For this reason, the prior art proposes a method of performing pneumatic testing on the opening pressure of the pressure regulating valve.

[0005] The existing gas testing method uses high-pressure gas as the test medium and replaces the traditional test oil with gas. During the specific pressure test, the oil pump is placed on the test bench, and the clamping mechanism on the top of the workpiece is used to clamp the oil pump (the oil pump is also the workpiece). Finally, high-pressure gas is filled into the oil pump chamber of the oil pump until the pressure regulating valve connected to the oil pump chamber automatically opens. The pressure when the pressure regulating valve automatically opens is the opening pressure of the pressure regulating valve. Although this test simplifies the detection of the opening pressure of the pressure regulating valve, it achieves the purpose of improving detection efficiency and reducing detection costs.

[0006] However, during the gas testing process, the pressure in the pump oil chamber is constantly rising, and an oil pump structure is installed in the pump oil chamber. When the pump oil structure is subjected to high-pressure pressure testing, the performance of the pump oil structure will be affected to a certain extent.

[0007] In addition, because the pump oil chamber continuously receives high-pressure gas, and the pump oil chamber is connected to the oil inlet channel, the oil discharge channel and the pressure relief channel for installing the pressure regulating valve, the existing clamping mechanism only realizes pressing at the upper end of the pump oil chamber and the angular position of the workpiece. However, under high-pressure testing, the oil pump is prone to displacement due to the high pressure. On the one hand, it is easy to affect the accuracy of the pressure regulating valve opening pressure test. On the other hand, the displacement of the oil pump under high pressure is also likely to cause safety hazards. Summary of the invention

[0008] The present invention is intended to provide a pressure test system to solve the problem in the prior art that the high pressure of high-pressure gas affects the performance of the oil pump structure in the oil chamber of a workpiece pump during the pressure test of the pressure regulating valve opening.

[0009] In order to achieve the above object, the basic scheme of the present invention is as follows:

[0010] The pressure test system includes a test bench and a clamping mechanism. The clamping mechanism includes a pressure plate, a pressure plate connected to the pressure plate, and a plurality of pressure rods. The plurality of pressure rods can be pressed against different positions of the workpiece. An upper sealing pad is provided at the bottom of the pressure plate, and a lower sealing pad is provided on the test bench. The upper sealing pad and the lower sealing pad can seal the upper and lower end surfaces of the workpiece pump oil cavity. The system also includes an air pressure regulating module, a pressure sensor, and a control module. The air pressure regulating module is used to provide pressurized gas to the pump oil cavity. The pressure sensor is connected between the air pressure regulating module and the pump oil cavity. The pressure sensor is used to collect pressure data of the pump oil cavity. Both the air pressure regulating module and the pressure sensor are connected to the control module. The control module controls the air pressure regulating module to provide gas with increasing pressure to the pump oil cavity. The control module receives and stores pressure data from the pressure sensor. The control module establishes a pressure curve that changes with time based on the pressure data. The control module determines the inflection point on the pressure curve according to the pressure curve data. The pressure corresponding to the inflection point is determined as the opening pressure of the pressure regulating valve.

[0011] Compared with the prior art, the following are the beneficial effects:

[0012] When this solution is adopted, the workpiece is pressed on the test bench by the pressure rod of the clamping mechanism. When the workpiece is pressed on the test bench, the pressure plate with the upper sealing gasket on the clamping mechanism is closed from one end face of the pump oil cavity of the workpiece, and the lower sealing gasket on the test bench is closed from the other end face of the pump oil cavity, so that the pump oil cavity of the workpiece can provide the pump oil cavity with pressurized gas with increasing pressure through the air pressure regulating module after the other channels of the pump oil cavity are closed, without installing the pump oil structure (such as the structure of the inner rotor and the outer rotor meshing to realize the pump oil). When the pressure in the pump oil cavity exceeds the bearing capacity of the pressure regulating valve, the pressure regulating valve automatically opens. The test system of this solution enables the pump oil cavity of the workpiece to realize the opening pressure test of the pressure regulating valve before the assembly is completed, which reduces the difficulty of detection and realizes the pre-positioning of the opening pressure detection of the pressure regulating valve, which is conducive to the timely detection and processing of the workpiece quality. In addition, the pump oil cavity of the workpiece can realize the opening pressure test of the pressure regulating valve without installing the pump oil structure, which completely avoids the situation that the performance of the pump oil structure is affected by the high pressure test.

[0013] In addition, this test system collects the pressure data of the pump oil chamber in real time through the pressure sensor, and saves the collected pressure data in real time through the control module. The control module can establish a pressure curve that changes with time based on the pressure data, thereby realizing process recording and process monitoring of the pressure test process. The control module controls the air pressure regulating module to continuously increase the test air pressure supplied to the pump oil chamber, and the control module automatically determines 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, thereby greatly improving the degree of automation.

[0014] Furthermore, a plurality of the pressure rods can be pressed tightly on both sides of a channel communicating with the pump oil cavity of the workpiece.

[0015] Beneficial effect: When this solution is adopted, the workpiece is placed on the test bench and is clamped by the clamping mechanism above the test bench. Specifically, the top of the workpiece pump oil chamber is clamped by the pressure plate, and the channel connected to the workpiece pump oil chamber is clamped on both sides by a number of pressure rods. In addition to the pump oil chamber being clamped, other channels that are subjected to high-pressure gas at the same time as the pump oil chamber are also clamped one by one, ensuring that the entire workpiece is fully clamped, avoiding the situation where the pump oil chamber is not sealed tightly or the workpiece is shifted due to insufficient clamping, which leads to inaccurate pressure testing of the pressure regulating valve opening and safety hazards caused by workpiece shifting.

[0016] Furthermore, the control module includes a display, and the display is capable of displaying a pressure curve.

[0017] Beneficial effect: Through the setting of the display and the pressure curve, the pressure test system makes the entire pressure test process of the pressure regulating valve more intuitive.

[0018] Furthermore, the control module determines the inflection point on the pressure curve based on the pressure curve data, and the pressure corresponding to the inflection point is determined as the opening pressure of the pressure regulating valve. The control module compares the pressure corresponding to the inflection point with a preset qualified pressure range. When the pressure corresponding to the inflection point exceeds the preset qualified pressure range, the control module issues an alarm.

[0019] Beneficial effect: When the pressure in the pump oil chamber continues to rise, the pressure collected by the pressure sensor also continues to rise. When the pressure increases to force the pressure regulating valve to open, the pressure in the pump oil chamber suddenly drops, and the pressure data collected by the pressure sensor will also suddenly drop. The pressure curve will also show a time-pressure change curve that first rises and then suddenly drops. The inflection point where the pressure suddenly drops is the opening pressure of the pressure regulating valve. This solution is convenient for the control module to determine the opening pressure of the pressure regulating valve, and it is convenient for the staff to intuitively see the entire pressure change process. When the opening pressure of the pressure regulating valve obtained by the test is not within the preset qualified pressure range, the control module issues an alarm to remind that the opening pressure of the pressure regulating valve is unqualified.

[0020] Furthermore, the air pressure regulating module includes an air storage device and a supercharger. The air storage device is used to store compressed gas. The input end of the supercharger is connected to the air storage device, and the output end of the supercharger is connected to the pump oil chamber. A proportional valve is connected to the supercharger. The supercharger and the proportional valve are both connected to the control module, and the proportional valve is connected to the output end of the supercharger.

[0021] Beneficial effect: The gas storage device provides high-pressure gas to the supercharger, and the high-pressure gas is pressurized by the supercharger to meet the pressure requirement of the gas measurement. Then the high-pressure gas supplied to the pump oil chamber is pressurized at the same gradient through the proportional valve to ensure that the pressurization process of the entire pump oil chamber is carried out in a step-by-step manner, avoiding the problem that the accuracy of the pressure data collected by the pressure sensor is affected by the sudden increase in the pressure of the pump oil chamber.

[0022] Furthermore, the test bench is provided with an air intake channel, and the lower sealing gasket is provided with an air passage channel, which is connected to the air intake channel, and the air passage channel can be connected to the pump oil chamber, and the end of the air intake channel away from the air passage channel is connected to the air pressure regulating module.

[0023] Beneficial effect: This scheme facilitates the connection between the test bench and the air pressure regulating module through the setting of the air intake channel. The high-pressure gas generated by the air pressure regulating module enters the pump oil chamber through the air intake channel and the air passage, which is convenient for the opening pressure test of the pressure regulating valve on the workpiece.

[0024] Furthermore, a sleeve is fixedly connected to the pressing plate, a pressing rod is vertically slidably connected to the sleeve, and a top of the pressing rod can abut against the pressing plate.

[0025] Beneficial effect: In actual use, when the lower sealing gasket is not subjected to external force from the clamping mechanism, the lower sealing gasket pushes the workpiece upward, causing the workpiece to tilt when it is just placed on the test bench. If the quick clamping method is directly used, it is easy to cause the workpiece to be clamped when it is tilted, that is, when the position is not adjusted properly, resulting in a loose seal in the pump oil chamber and affecting the accuracy of the detection. However, this solution uses the setting of the sleeve to ensure that multiple pressure rods only achieve preliminary positioning but not clamping when they touch the workpiece. Only when the pressure plate continues to move downward to drive the sleeve to move until the top of the pressure rod abuts against the lower surface of the pressure plate will the workpiece be truly clamped. This process allows the bottom end of the pressure rod to first contact the workpiece, then find the clamping position, and finally clamp the workpiece, achieving comprehensive and accurate clamping of the workpiece, ensuring the tightness of the pump oil chamber seal, and helping to improve the accuracy of the pressure test of the pressure regulating valve.

[0026] Furthermore, the test bench is provided with a limiting column, which can be inserted into the mounting hole of the workpiece.

[0027] Beneficial effect: By setting the limit column, the accuracy of workpiece positioning is further increased.

[0028] Furthermore, a positioning piece is provided on the test bench, the positioning piece is in contact with the surface of the workpiece, and the positioning piece is located on one side of the limiting column.

[0029] Beneficial effect: On the one hand, the presence of the positioning piece cooperates with the limit column to make the placement of the workpiece more accurate, and avoid the workpiece from moving due to excessive pressure during the pressure test; at the same time, the positioning piece is arranged on one side of the limit column, so that when the workpiece is placed on the test bench, the workpiece is first directly pressed against the positioning piece, and then the workpiece can be quickly placed down. During the process of placing the workpiece downward, the mounting hole of the workpiece is automatically inserted into the limit column to complete the rapid positioning of the workpiece. This solution makes the placement of the workpiece on the test bench simple, fast and accurate.

[0030] Furthermore, the clamping mechanism includes a driver for driving the pressure plate to rise and fall, the driver includes a main drive and an auxiliary drive located on both sides of the main drive, the output ends of the main drive and the auxiliary drive are fixedly connected to the pressure plate, and the output end of the main drive is fixedly connected to the middle of the pressure plate.

[0031] Beneficial effect: By setting the main drive and the auxiliary drive, the middle part and the two sides of the pressing plate are driven, so that the force on the pressing plate is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a three-dimensional structure of an embodiment of the present invention;

[0033] Figure 2 for Figure 1 The main view of

[0034] Figure 3 for Figure 1 A partial right side sectional view in FIG.

[0035] Figure 4 Schematic diagram of the three-dimensional structure of the test bench in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of a three-dimensional structure of a workpiece placed on a test bench in an embodiment of the present invention;

[0037] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure of the workpiece after being pressed by the pressing head and the pressing plate;

[0038] Figure 7 A diagram showing the connection relationship between the air pressure regulating module and the air intake passage of the test bench according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The figure marks in the drawings of the specification include: frame 1, test bench 2, lower sealing gasket 21, air inlet channel 22, air passage 23, limit column 24, positioning member 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, clamping plate 53, pressure rod 6, pressure head 61, pusher 7, moving block 71, workpiece 10, pump oil chamber 101, oil inlet channel 102, oil discharge channel 103, pressure relief channel 104.

[0041] Example

[0042] The embodiment is basically as shown in the attached Figures 1 to 7 As shown, the pressure test system includes a frame 1, a test bench 2, a clamping mechanism, an air pressure regulating module, a pressure sensor and a control module. The clamping mechanism includes a driver 3, a pressure plate 4, a pressure plate 5 connected to the pressure plate 4, and a plurality of pressure rods 6. The driver 3 is fixedly mounted 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 plate 5 can be clamped on the pump oil chamber 101 of the workpiece 10, and the pressure rod 6 can be clamped on both sides of the channel connected to the pump oil chamber 101. The pump oil chamber 101 is connected to an oil inlet channel 102, an oil discharge channel 103 and a pressure relief channel 104.

[0043] The driver 3 includes a main driver 31 and an auxiliary driver 32 located on both sides of the main driver 31. The main driver 31 and the auxiliary driver 32 are both fixedly connected to the frame 1. The output ends of the main driver 31 and the auxiliary driver 32 are both 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, the main driver 31 and the auxiliary driver 32 both use cylinders.

[0044] Combination Figure 3 and Figure 4 A lower sealing gasket 21 is fixedly connected to the test bench 2 by screws, and an upper sealing gasket 51 is fixedly connected to the lower surface of the pressure plate 5 by screws. The upper sealing gasket 51 and the lower sealing gasket 21 are located at the upper and lower sides of the pump oil chamber 101.

[0045] An air inlet channel 22 is provided on the test bench 2, and an air passage 23 is provided on the lower sealing gasket 21. One end of the air passage 23 is connected to the air inlet channel 22, and the other end of the air passage 23 can be connected to the pump oil chamber 101; the upper surface of the test bench 2 is fixedly connected to a limiting column 24 and a positioning member 25 by screws, the limiting column 24 can be inserted into the mounting hole of the workpiece 10, the positioning member 25 is in contact with the surface of the workpiece 10, and the positioning member 25 is located on one side of the limiting column 24; the end of the air inlet channel 22 away from the air passage 23 is connected to the air pressure regulating module.

[0046] The pressure plate 4 is fixedly connected with a plurality of sleeves 41 by screws, and each pressure rod 6 has a corresponding 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 with a pressure head 61; the pressure plate 5 includes a connecting rod 52 and a clamping plate 53. The connecting rod 52 is vertically slidably connected in the corresponding sleeve 41, and the top of the connecting rod 52 can abut against the pressure plate 4. The clamping plate 53 is threadedly connected to the connecting rod 52, and the clamping plate 53 can be clamped on the pump oil chamber 101. The upper sealing gasket 51 is fixed to the bottom of the clamping plate 53; in this embodiment, the pressure plate 4 includes an upper plate 42, a middle plate 43 and a lower plate 44 arranged in sequence from top to bottom, the middle plate 43 is sandwiched between the upper plate 42 and the lower plate 44, and the upper plate 42 is fixedly connected to the lower plate 44 Then, the upper plate 42 is fixedly connected to the output end of the driver 3, the sleeve 41 is fixedly connected to the lower plate 44, and the pressure rod 6 and the connecting rod 52 can be pressed against the middle plate 43 after moving upward. The existence of the middle plate 43, on the one hand, facilitates the installation of the pressure plate 4 and the output end of the driver 3 and the installation of the sleeve 41, the connecting rod 52 and the pressure rod 6; on the other hand, when the middle plate 43 in the pressure plate 4 is damaged, only the middle plate 43 needs to be replaced, thereby 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 respectively connected to the two.

[0047] A side blocking mechanism is also installed on the test bench 2, and the side blocking mechanism 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, and the sealing ring can be against the side of the workpiece 10. The sealing ring on the moving block 71 can seal the channel opened on the side of the workpiece 10 and connected to the pump oil chamber 101. In this embodiment, the channel opened on the side of the workpiece 10 is an oil inlet channel 102, and the pusher 7 adopts a cylinder.

[0048] In this embodiment, the outlet of the oil discharge channel 103 of the workpiece 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 workpiece 10 .

[0049] Combination Figure 7 The air pressure regulating module and the pressure sensor are both connected to the control module. The air pressure regulating module is used to provide pressurized gas to the pump oil chamber 101. The air pressure regulating module includes a gas storage device and a supercharger. The gas storage device is used to store compressed gas. In this embodiment, the gas storage device includes an air compressor and an air storage tank. The air compressor injects high-pressure air into the air storage tank. The input end of the supercharger is connected to the output end of the gas storage device, and the output end of the supercharger is connected to the pump oil chamber 101. A proportional valve is connected to the output end of the supercharger. The output end of the proportional valve is connected to the intake channel 22 through a pipeline. The pressure sensor is installed on the pipeline connecting the proportional valve and the intake channel 22. The pressure sensor is used to collect pressure data of the pump oil chamber 101. The supercharger and the proportional valve are both connected to the control module. The proportional valve is used to increase the pressure sent to the pump oil chamber 101 by the supercharger at the same gradient.

[0050] The control module controls the air pressure regulating module to provide the pump oil chamber 101 with gas of increasing pressure. The control module receives and stores the pressure data from the pressure sensor. The control module establishes a pressure curve that changes with time based on the pressure data. The control module determines the inflection point on the pressure curve according to the pressure curve data. 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 display that can display the pressure curve.

[0051] The specific implementation process is as follows:

[0052] When the pressure opening test of the pressure regulating valve of the workpiece 10 is performed using this embodiment, the workpiece 10 with the pressure regulating valve is first moved to the test bench 2. When the workpiece 10 is placed on the test bench 2, the workpiece 10 is first directly pressed against the positioning member 25, and then the workpiece 10 can be quickly placed downward. During the process of placing the workpiece 10 downward, the mounting hole of the workpiece 10 is automatically inserted into the limiting column 24, thereby completing the rapid and accurate positioning of the workpiece 10.

[0053] Then, the clamping 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 downward, and then drive the pressing rod 6 and the connecting rod 52 sliding in the sleeve 41 to move downward, and the pressing plate 4 moves downward until the pressure head 61 at the end of the pressing rod 6 contacts the workpiece 10, and at the same time, the clamping plate 53 and the upper sealing gasket 51 at the end of the connecting rod 52 contact the workpiece 10, and the driver 3 continues to drive the pressing plate 4 to move downward until the pressing rod 6 and the connecting rod 52 move along the sleeve 41 and press against the pressing plate 4, completing the pressing of the workpiece 10. When the workpiece 10 is 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; and because the outlet of the oil discharge channel 103 on the workpiece 10 connected to the pump oil chamber 101 faces the test bench 2, and the test bench 2 is equipped with a sealing ring for blocking the outlet of the oil discharge channel 103, the outlet of the oil discharge channel 103 of the workpiece 10 is blocked.

[0054] The pusher 7 of the side blocking mechanism is started, so that the pusher 7 drives the moving block 71 to press against the side of the workpiece 10. Since a sealing ring is installed on the moving block 71 to block the oil inlet channel 102 on the side of the workpiece 10, the opening of the oil inlet channel 102 of the workpiece 10 is also blocked.

[0055] Finally, the control module controls the air pressure regulating 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 an isogradient manner through the supercharger and the proportional valve, so that the high-pressure gas finally enters the closed 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 bearing capacity of the pressure regulating valve, the pressure regulating valve automatically opens.

[0056] When this embodiment is adopted, the top of the pump oil chamber 101 is pressed and sealed by the pressure plate 5, and the channels connected to the pump oil chamber 101 are pressed on both sides thereof by a plurality of pressure rods 6, so that in addition to the pump oil chamber 101 being pressed, other channels that are subjected to high-pressure gas at the same time as the pump oil chamber 101 are also pressed one by one, ensuring that the entire workpiece 10 is fully pressed, avoiding the problems of inaccurate opening pressure test of the pressure regulating valve and safety hazards caused by displacement of the workpiece 10 due to insufficient pressing or displacement of the workpiece 10.

[0057] During the process of clamping the workpiece 10, the sleeve 41 is set in this embodiment so that the multiple pressure rods 6 only achieve preliminary positioning but not clamping when they touch the workpiece 10. Only when the pressure plate 4 continues to move downward to drive 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 workpiece 10 be truly clamped. This process enables the bottom end of the pressure rod 6 (that is, the pressure head 61) to first contact the workpiece 10, then find the clamping position, and finally clamp the workpiece 10, thereby achieving comprehensive and accurate clamping of the workpiece 10, ensuring the tightness of the seal of the pump oil chamber 101, and helping to improve the accuracy of the pressure test of the pressure regulating valve.

[0058] The present embodiment enables the workpiece 10 to achieve upper and lower sealing of the oil pump chamber 101 through the upper sealing gasket 51 and the lower sealing gasket 21 without installing an oil pump structure (such as a structure in which an inner rotor and an outer rotor are meshed to achieve oil pumping), and to close the oil inlet channel 102 of the workpiece 10 through a side blocking mechanism, and to close the outlet of the oil discharge channel 103 of the workpiece 10 through a sealing ring on the test bench 2, and to provide the oil pump chamber 101 with pressurized gas with increasing pressure through an air pressure regulating module, thereby facilitating an opening pressure test of the pressure regulating valve before the oil pump is assembled, achieving the pre-positioning of the opening pressure detection of the pressure regulating valve, and facilitating timely detection and processing of the quality of the workpiece 10. In addition, the oil pump chamber 101 of the workpiece 10 can achieve an opening pressure test of the pressure regulating valve without installing an oil pump structure, thereby completely avoiding the situation in which the performance of the oil pump structure is affected by the high-pressure test.

[0059] In addition, in the process of the pressure in the pump oil chamber 101 constantly rising, because the pressure sensor is arranged on the connecting pipe between the proportional valve and the air intake channel 22, the pressure sensor is equivalent to real-time collection of the pressure data of the pump oil chamber 101, and the control module saves the collected pressure data in real time. The control module can establish a pressure curve that changes with time based on the pressure data, thereby realizing process recording and process monitoring of the pressure test process. The control module controls the air pressure regulating module to continuously increase the test air pressure supplied to the pump oil chamber 101 in the form of equal gradient, and the control module automatically determines 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, and automatically issues an alarm when it is determined to be unqualified, thereby greatly improving the degree of automation.

[0060] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pressure test system, including a test bench and a clamping mechanism, characterized in that: The clamping mechanism includes a pressing plate, a pressing disk connected to the pressing plate, and a plurality of pressing rods, the plurality of pressing rods can be pressed against different positions of the workpiece, an upper sealing pad is provided at the bottom of the pressing plate, and a lower sealing pad is provided on the test bench, the upper sealing pad and the lower sealing pad can seal the upper and lower end surfaces of the workpiece pump oil cavity; it also includes an air pressure regulating module, a pressure sensor and a control module, the air pressure regulating module is used to provide pressurized gas to the pump oil cavity, the pressure sensor is connected between the air pressure regulating module and the pump oil cavity, and the pressure sensor is used to collect pressure data of the pump oil cavity; the air pressure regulating module and the pressure sensor are both connected to the control module, the control module controls the air pressure regulating module to provide gas with increasing pressure to the pump oil cavity, the control module receives and stores pressure data from the pressure sensor, the control module establishes a pressure curve that changes with time based on the pressure data, the control module determines 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 pressing plate is fixedly connected with a sleeve, the pressing rod is vertically slidably connected to the sleeve, and the top of the pressing rod can abut against the pressing plate; The clamping mechanism includes a driver for driving the pressing plate to rise and fall, the driver includes a main driver and a secondary driver located on both sides of the main driver, the output ends of the main driver and the secondary driver are both fixedly connected to the pressing plate, and the output end of the main driver is fixedly connected to the middle of the pressing plate; The pressure plate includes an upper plate, a middle plate and a lower plate which are arranged in sequence from top to bottom. The middle plate is clamped between the upper plate and the lower plate. The upper plate is fixedly connected to the lower plate. The upper plate is fixedly connected to the output end of the driver. The sleeve is fixedly connected to the lower plate. The pressure rod and the connecting rod can be pressed against the middle plate after moving upward.

2. The pressure testing system according to claim 1, characterized in that: A plurality of the pressure rods can be pressed tightly on both sides of a channel communicating with the pump oil cavity of the workpiece.

3. The pressure testing system according to claim 1, characterized in that: The control module includes a display capable of displaying a pressure curve.

4. The pressure testing system according to claim 3, characterized in that: The control module compares the pressure corresponding to the inflection point with a preset qualified pressure range, and when the pressure corresponding to the inflection point exceeds the preset qualified pressure range, the control module issues an alarm.

5. The pressure testing system according to claim 2, characterized in that: The air pressure regulating module includes an air storage device and a supercharger. The air storage device is used to store compressed gas. The input end of the supercharger is connected to the air storage device, and the output end of the supercharger is connected to the pump oil chamber. The supercharger is connected to a proportional valve. The supercharger and the proportional valve are both connected to the control module, and the proportional valve is connected to the output end of the supercharger.

6. The pressure testing system according to claim 1, characterized in that: The test bench is provided with an air intake channel, and the lower sealing gasket is provided with an air passage channel, which is connected to the air intake channel, and the air passage channel can be connected to the pump oil chamber, and the end of the air intake channel away from the air passage channel is connected to the air pressure regulating module.

7. The pressure testing system according to claim 1, characterized in that: The test bench is provided with a limiting column, which can be inserted into the mounting hole of the workpiece.

8. The pressure testing system according to claim 7, characterized in that: The test bench is also provided with a positioning piece, which is in contact with the surface of the workpiece and is located on one side of the limiting column.

Images