Automatic pressure detection device for oil source recirculation

Abstract

The invention discloses an automatic pressure detection device for oil source recirculation. The automatic pressure detection device is characterized by comprising an oil source system, a circulating system, an injection system and a loading system, the circulating system comprises a hydraulic pump and a motor A, a pipeline filter assembly is arranged in a pipeline, and the circulating system is switched to a clean oil tank or a dirty oil tank through an electromagnetic reversing valve; the injection system comprises a driving device, a lead screw assembly is driven by the driving device, the lead screw assembly is linked with an oil cylinder, and the oil cylinder is connected with the loading system; and the loading system comprises a direct-acting overflow valve connected with the oil cylinder, and the direct-acting overflow valve is connected to a tested piece product interface through a one-way valve B and a high-pressure ball valve. High-precision, high-efficiency and high-stability automatic detection of the pressure gauge is realized, human eye recognition errors are solved, the labor cost is reduced, and the working efficiency is improved; through an automatic circulating system of an oil source, long-term operation of the device is guaranteed, oil source pollution is avoided, and resource waste is reduced.

Description

Technical Field

[0001] The invention relates to oil pressure gauge detection equipment technology, in particular to an automatic pressure detection device for oil source recycling. Background Art

[0002] A pressure gauge is an instrument that measures and displays current pressure and is widely used in industrial and scientific research fields. As a high-precision measuring instrument, the pressure gauge must undergo professional technical testing before leaving the factory. Currently, the pressure gauge testing methods on the market generally have problems such as few equipment options, large demand for standard instruments, serious oil source pollution, and high costs.

[0003] There are also many designs in this regard in the disclosed devices, such as the patent publication number CN116735077A, a pressure instrument detection device and a detection method thereof, which includes a bracket with a support plate at the upper end in an L shape for fixing the entire device; an adjustment component for placing the instrument; a snap-fit ​​component for detecting the transmission; a snap-fit ​​guide component vertically slidably arranged at the upper end of the support plate for approaching and separating the detection part; a connecting mechanism fixedly arranged at the lower end of the snap-fit ​​guide component, the connecting mechanism consisting of a leather tube opening and closing component and a driving component, which are respectively used for the kit and drive during instrument detection.

[0004] The main problem that this device solves is the conversion from traditional manual to automatic installation of the pressure gauge to be tested. It realizes the expansion of the leather hose through a connecting mechanism, using curved surface transmission and sliding structure, so that when the pressure gauge is subjected to pressure testing, the air connecting leather hose and the pressure gauge connecting pipe are automatically connected. The snap-fit ​​assembly adopts a concentric crank slider mechanism to separate the snap-fit ​​and separation strokes, so as to realize automatic snap-fit ​​and separation of the leather hose.

[0005] Although this device can be applied to assembly line operations to improve the efficiency of meter installation and replacement, there is no specific technical solution for test accuracy. From hydraulic oil injection to data acquisition, it is basically determined by traditional methods and manual visual inspection. When testing oil pressure gauges, it relies on operational experience. In addition, these mechanisms themselves have high requirements for machined structure accuracy, so the cost is also high. As traditional detection methods and means, they are also cumbersome and time-inefficient. In order to improve the stability, automation, and efficiency of pressure gauge detection, these bottleneck problems encountered in instrument commissioning work need to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems and provide an automatic pressure detection device for oil source recycling, which has the characteristics of high precision, high resolution, wide pressure regulation range, fast response, automatic detection and control of pressure gauge, low labor cost, energy saving, etc.

[0007] The above technical problems of the present invention are mainly solved through the following technical solutions: an automatic pressure detection device for oil source recycling, which is characterized by including an oil source system, a circulation system, an injection system and a loading system; and is equipped with a standard pressure gauge, an industrial all-in-one machine, a high-pressure ball valve, and a test piece product interface.

[0008] The oil source system is provided with a clean oil tank and a dirty oil tank.

[0009] The circulation system includes a hydraulic pump and a motor A, and a pipeline filter assembly is provided in the pipeline, and is switched to a clean oil tank or a dirty oil tank through an electromagnetic reversing valve.

[0010] The injection system comprises a driving device, which drives a screw assembly, the screw assembly is linked to an oil cylinder, and the oil cylinder is connected to a loading system.

[0011] The loading system includes a direct-acting relief valve connected to the oil cylinder, and the direct-acting relief valve is connected to the product interface of the test piece through a one-way valve B and a high-pressure ball valve.

[0012] The industrial integrated machine, motor A, and injection system drive device are connected to a PLC control system.

[0013] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, the oil inlet end of the oil cylinder in the injection system is connected to the clean oil tank via a one-way valve A and a low-pressure ball valve.

[0014] In the aforementioned automatic pressure detection device for oil source recycling, preferably, a high-pressure filter and a pressure relief valve are provided between the one-way valve B and the high-pressure ball valve. The pressure relief valve is a solenoid valve, which is connected to the PLC control system, and the oil outlet pipe of the pressure relief valve is connected to the dirty oil tank.

[0015] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, a standard pressure transmitter is provided on the pipeline leading out from between the direct-acting relief valve and the one-way valve B of the loading system.

[0016] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, the pipeline filter assembly in the circulation system includes a multi-stage filter arranged in series, and the filtering accuracy of the multi-stage filter increases successively.

[0017] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, the injection system drive device includes a motor B, which is a servo motor; and the motor A in the circulation system is a single-phase motor.

[0018] In the aforementioned automatic pressure detection device for oil source recycling, preferably, the oil source system, circulation system, injection system and loading system are integrated in a box, and the standard pressure gauge, high-pressure ball valve, product interface and industrial all-in-one machine are arranged on the upper part of the box to constitute an independent detection device.

[0019] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, the loading system one-way valve B and the direct-acting relief valve are fixed inside the valve block to form an integrated structure, the internal channels of the valve block are interconnected, and the valve block is provided with an external interface, which is connected to the test product, the standard pressure gauge, and the standard pressure transmitter through a pipeline.

[0020] In the aforementioned automatic pressure detection device for oil source recirculation, preferably, the oil tank in the oil source system is also provided with a liquid level gauge, an air filter and a liquid level switch.

[0021] In the aforementioned automatic pressure detection device for oil source recycling, as a preferred embodiment, the injection system obtains control accuracy and response speed through large torque and small speed, and the injection system is activated or stopped through feedback signals. The rotational motion of the driving device is converted into linear motion through the screw assembly, thereby driving the screw assembly of the injection system to suck the oil source into the oil cylinder and press it into the test product.

[0022] This technical solution is designed with a complete pressure detection device as the object, and is mainly composed of an interrelated oil source system, a circulation system, an injection system, a loading system and a PLC control system including a display output.

[0023] Among them, the circulation system is responsible for filtering, cleaning, recycling and reusing the hydraulic oil of the detection device to save energy and reduce consumption. This system is equipped with multi-stage filters arranged in series with increasing precision for filtering, so that both large and small particles of impurities can be removed in the set pressure pipeline filtration.

[0024] The injection system and loading system perform pressure tests on the test product. Different from the traditional hydraulic pump pressure test system, which can only be used as a static pressure test, the corresponding pressure control requires adjusting the proportional relief valve to control its oil pressure. However, the proportional relief valve cannot be adjusted at 0-1MPa relative to the high-pressure oil source, and the corresponding low-precision control cannot be achieved. However, this device uses a servo motor to drive the reducer, which can achieve high torque and low speed. At this time, the servo motor has better control accuracy and response speed than ordinary motors. It can be stopped by feedback signals, and further converted into linear motion through high-precision power transmission parts and screw assemblies that are easily available through conventional machining, driving the oil rod of the injection system to suck the oil source into the oil cylinder and inject it into the test product at a certain pressure. On this basis, the industrial integrated machine and PLC control system are used to obtain efficient and high-precision automatic detection and control.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: through the application of the industrial all-in-one machine PLC control system and the injection system with high-precision dimensional control and the hardware support of the loading system, high-precision, high-efficiency and high-stability automatic detection of the pressure gauge is achieved, the human eye recognition error is solved, the labor cost is reduced and the work efficiency is improved; through the automatic circulation system of the oil source, the long-term operation of the device is guaranteed, the oil source pollution is avoided and the waste of resources is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a system principle diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the present invention.

[0028] Figure 3 It is a structural schematic diagram of an injection system of the present invention.

[0029] Figure 4 It is a schematic diagram of a power configuration structure of a circulation system of the present invention.

[0030] Figure 5 It is a structural schematic diagram of an integrated loading system of the present invention.

[0031] In the figure: 101-box; 102-pipeline filter assembly; 103-oil source system; 104-pressure relief valve; 105-air filter; 106-standard pressure gauge; 107-industrial integrated machine; 108-standard pressure transmitter; 109-check valve A; 110-injection system; 111-loading system; 201-oil cylinder; 202-screw assembly; 203-bell cover; 204-reducer; 205-motor B; 301-hydraulic pump; 302-motor A; 401-direct-acting overflow valve; 402-valve block; 403-check valve B; 404-bracket. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0033] This embodiment is an automatic pressure detection device for oil source recirculation, such as Figure 1 , Figure 2 As shown, the entire device includes an oil source system 103, a circulation system, an injection system 110, a loading system 111, a PLC control system, an industrial all-in-one machine 107 (including a high-definition display system), and is equipped with a standard pressure gauge 106, a high-pressure ball valve, a test piece product interface, etc.

[0034] The industrial integrated machine 107, all motors, and injection system drive devices are connected to the PLC control system.

[0035] The oil source system 103, circulation system, injection system 110 and loading system 111 of the device are integrated in the box 101, and the standard pressure gauge 106, high-pressure ball valve, product interface and industrial integrated machine 107 are arranged on the upper part of the box 101 to form an independent complete detection equipment.

[0036] The oil source system is provided with a clean oil tank and a dirty oil tank; both the clean oil tank and the dirty oil tank are provided with a liquid level gauge, an air filter 105 for maintaining the balance between the pressure inside the oil tank and the atmospheric pressure, and a float liquid level switch as an oil safety alarm switch. In addition, a low-pressure ball valve is provided for cleaning the oil tank after draining the oil.

[0037] The circulation system includes a hydraulic pump 301 and a motor A302, which serve as the power source for circulating filtered oil. The motor A302 is a single-phase motor with low control accuracy, low speed and relatively low cost, such as Figure 4 As shown, an oil suction filter is provided before the dirty oil tank enters the hydraulic pump 301 to filter impurities to prevent the components from being blocked. A pipeline filter assembly 102 is provided in the circulation system pipeline. The pipeline filter assembly 102 is composed of two-stage filters arranged in series. The filtering accuracy of the two-stage filters increases in sequence. The pressure pipeline near the hydraulic pump 301 filters 10μm to filter large particles of impurities in the hydraulic oil; the pressure pipeline far from the hydraulic pump 301 filters 5μm to filter small particles of impurities in the hydraulic oil.

[0038] After the hydraulic oil is filtered, the solenoid reversing valve controls the filtered oil to be switched to the clean oil tank, or to flow back to the dirty oil tank.

[0039] Further, the injection system includes a drive device, and the drive device includes a motor B205, such as Figure 3 As shown, the motor B is a servo motor to achieve high precision and control speed accuracy; the motor B205 is matched with a reducer 204, which is connected to the screw assembly 202 via a coupling, the screw assembly 202 is linked to the oil cylinder 201, and the oil cylinder 201 is connected to the loading system 111. A bell cover 203 is provided outside the screw assembly 202 and the connection part of the screw assembly 202 and the coupling. The bell cover 203 serves as a guide body for the oil rod in the screw assembly 202 and the oil cylinder 201, and also as a mechanism housing.

[0040] The oil inlet end of the oil cylinder 201 in the injection system 110 is connected to the clean oil tank via a one-way valve A109, a low-pressure ball valve and an oil suction filter 80 μm.

[0041] The device obtains control accuracy and response speed by using an injection system 110 with high torque and low rotation speed, and activates or stops the injection system 110 through a feedback signal. The screw assembly 202 drives the device to convert the rotational motion into linear motion, thereby driving the screw assembly (202) of the injection system to suck the oil source into the oil cylinder (201) and press it into the test product.

[0042] Furthermore, the loading system includes a direct-acting relief valve 401 connected to the oil cylinder, which is connected to the test product interface through a one-way valve B403 and a high-pressure ball valve, and the direct-acting relief valve 401 is connected to the clean oil tank. A high-pressure filter and a pressure relief valve 104 are provided between the one-way valve B403 and the high-pressure ball valve. The high-pressure filter is used to filter the high-pressure oil to prevent impurities from entering the product. The pressure relief valve 104 is a solenoid valve connected to the PLC control system. The oil outlet pipe of the pressure relief valve 104 is connected to the dirty oil tank. After the test is completed, the pressure relief valve 104 removes the pipeline pressure.

[0043] A standard pressure transmitter 108 is set up through a pipeline between the direct-acting relief valve 401 and the one-way valve B403 of the loading system to instantly detect the system pressure, and dual pressure gauges are configured through the high-pressure ball valves: the 0-2.5MPa specification is used to observe low-pressure oil, and the 0-50MPa specification is used to observe high-pressure oil.

[0044] The one-way valve B403 and the direct-acting relief valve 401 of the loading system are fixed inside the valve block 402 to form an integrated structure. Figure 5 As shown, the valve block is installed in the box 101 through the bracket 404. The internal channels of the valve block are connected to each other, and the valve block is provided with an external interface, which is connected to the test product, the standard pressure gauge 106, and the standard pressure transmitter 108 through a pipeline.

[0045] In addition, an oil pan is provided at the installation position of the test piece, and the oil pan is connected to the dirty oil tank through a low-pressure ball valve.

[0046] The computer measurement and control software of the industrial all-in-one machine 107 in this embodiment uses Labview, and the parameters include pressure (MPa), execution speed (mm / s), and target distance (mm).

[0047] The operation process is as follows:

[0048] Connect the pressure gauge to be tested to the test product interface on the upper part of the box 101, turn on the power, start the industrial integrated machine 107, open the measurement and control software on the computer interface, and display the measurement and control interface and display parameters.

[0049] Open the high-pressure ball valves at the pressure gauge to be tested and the standard pressure gauge 106, and start the measurement and control system.

[0050] First, start the motor B205 of the injection system 110 drive device to drive the reducer 204 to work, and pump the hydraulic oil of the oil source system 103 into the cylinder 201. After the pressure reaches the test value, the motor B205 drives the reducer 204 to pump the hydraulic oil into the loading system 110 through the pipeline. At this time, the one-way valve A109 prevents the hydraulic oil from flowing back to the oil source system 103 (clean oil tank). The hydraulic oil passing through the loading system 110 flows through the pipeline to the standard pressure transmitter 108 and the standard pressure gauge 106, and the other way flows through the one-way valve B403 and the pipeline filter assembly to the pressure gauge to be tested and the pressure relief valve 104.

[0051] After the pressure in the pipeline is stabilized, the pulse of the standard pressure transmitter 108 is transmitted to the PLC control system, and after being processed by the PLC, it is transmitted to the industrial integrated machine 107 to display the parameter. This parameter is compared with the standard pressure gauge 106 and the pressure gauge to be tested. The error of the read data is calculated. If the error is within the specified range, the pressure gauge to be tested is qualified. The parameter comparison is the standard pressure and the measured pressure; error calculation: return error = (second reading - first reading) / full scale x 100%; allowable error: maximum range of the standard gauge X ± accuracy level; qualified and unqualified judgment: the return error is within ±0.25% and is qualified, otherwise it is unqualified. The allowable error is qualified within the calculated value range, otherwise it is unqualified.

[0052] After the pressure gauge to be tested is tested, the pressure relief valve 104 is opened to pump the hydraulic oil back to the oil source system 103 to relieve the pressure of the pipeline. Then the high-pressure ball valve is closed and the pressure gauge to be tested is removed. The circulating filtration of the oil source is to start the motor A302 of the circulation system to drive the hydraulic pump 301 to work, and the dirty oil flows back to the clean oil tank or dirty oil tank of the oil source system 103 through the pipeline filter 102.

[0053] The above embodiments are for explanation of the present invention, not for limitation of the present invention, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An automatic pressure detection device for oil source recirculation, characterized in that It includes an oil source system (103), a circulation system, an injection system (110) and a loading system (111); and is equipped with a standard pressure gauge (106), an industrial integrated machine (107), a high-pressure ball valve, and a test piece product interface; The oil source system is provided with a clean oil tank and a dirty oil tank; The circulation system comprises a hydraulic pump (301), a motor A (302), and a pipeline filter assembly (102) is provided in the pipeline, and is switched to a clean oil tank or a dirty oil tank through an electromagnetic reversing valve; The injection system comprises a driving device, which drives a screw assembly (202), the screw assembly is linked to an oil cylinder (201), and the oil cylinder is connected to a loading system; The loading system comprises a direct-acting relief valve (401) connected to the oil cylinder, and the direct-acting relief valve is connected to the product interface of the test piece through a one-way valve B (403) and a high-pressure ball valve; The industrial integrated machine, motor A, and injection system drive device are connected to a PLC control system.

2. The automatic pressure detection device for oil source recycling according to claim 1 is characterized in that: The oil inlet end of the oil cylinder (201) in the injection system (110) is connected to the clean oil tank via a one-way valve A (109) and a low-pressure ball valve.

3. The automatic pressure detection device for oil source recycling according to claim 1 is characterized in that A high-pressure filter and a pressure relief valve (104) are provided between the one-way valve B (403) and the high-pressure ball valve. The pressure relief valve is a solenoid valve connected to a PLC control system. The oil outlet pipe of the pressure relief valve is connected to a dirty oil tank.

4. The automatic pressure detection device for oil source recycling according to claim 1, characterized in that: A standard pressure transmitter (108) is provided in the pipeline leading out from between the direct-acting relief valve (401) of the loading system and the check valve B (403).

5. The automatic pressure detection device for oil source recycling according to claim 1, characterized in that: The pipeline filter assembly (102) in the circulation system comprises a plurality of filters arranged in series, and the filtering accuracy of the plurality of filters increases successively.

6. The automatic pressure detection device for oil source recycling according to claim 1 is characterized in that: The injection system driving device comprises a motor B (205), which is a servo motor; the motor A (302) in the circulation system is a single-phase motor.

7. The automatic pressure detection device for oil source recycling according to claim 1, 2, 3, 4 or 5, characterized in that: The oil source system (103), circulation system, injection system (110) and loading system (111) are integrated in a box (101), and a standard pressure gauge (106), a high-pressure ball valve, a product interface and an industrial integrated machine (107) are arranged on the upper part of the box, forming an independent detection device.

8. The automatic pressure detection device for oil source recycling according to claim 1 is characterized in that: The loading system one-way valve B (403) and the direct-acting relief valve (401) are fixed inside the valve block (402) to form an integrated structure. The internal channels of the valve block are interconnected, and the valve block is provided with an external interface, which is connected to the test product, the standard pressure gauge (106), and the standard pressure transmitter (108) through a pipeline.

9. The automatic pressure detection device for oil source recycling according to claim 1, characterized in that: The oil tank in the oil source system is also provided with a liquid level gauge, an air filter (105) and a liquid level switch.

10. The automatic pressure detection device for oil source recycling according to claim 1, characterized in that: The injection system (110) obtains control accuracy and response speed through high torque and low rotation speed, and activates or stops the injection system through feedback signals. The screw assembly (202) converts the rotational motion of the driving device into linear motion, thereby driving the screw assembly (202) of the injection system to suck the oil source into the oil cylinder (201) and press it into the test product.

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