Device and method for detecting air tightness of oil storage cylinder of oil damper

Abstract

The invention discloses a device and a method for detecting the air tightness of an oil storage cylinder of an oil damper, relates to the technical field of oil damper detection, and aims to solve the problems of high working intensity and low efficiency of manual operation. The industrial control all-in-one machine is fixedly installed on the experiment table and electrically connected with the mechanical arm and the airtight pressing machine assembly, and a hydraulic power unit and a high-pressure gas unit are arranged in the experiment table; the airtight press assembly is fixedly mounted on the experiment table, and the oil storage cylinder tray is placed on the experiment table; a mounting rack of the airtight press assembly is fixedly connected with the experiment table, the hydraulic cylinder is fixed at the top of the mounting rack, the displacement sensor and the pressure head assembly are mounted at the output end of the hydraulic cylinder, the pressure head assembly and the hydraulic cylinder are coaxially arranged, the fixed clamping jaw is fixed on the mounting rack, and the hydraulic power unit and the displacement sensor are electrically connected with the industrial control all-in-one machine; the fixed end of the mechanical arm is fixed to the mounting frame, and a transfer clamping jaw is fixedly mounted at the clamping end of the mechanical arm. According to the device and the method, automatic detection operation of the oil storage cylinder is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pressure shock absorber detection, and in particular to an oil pressure shock absorber oil storage cylinder air tightness detection device and detection method. Background Art

[0002] Hydraulic shock absorbers are important parts on the bogies of EMUs. They are used to attenuate high-frequency and low-frequency vibrations of various parts of the vehicle. They rely on the reciprocating movement of the stretching and compressing piston rods to form hydraulic damping force to achieve the purpose of vibration reduction. Hydraulic shock absorbers include first-order vertical shock absorbers, second-order vertical shock absorbers, second-order lateral shock absorbers, and anti-snaking shock absorbers. The first-order vertical hydraulic shock absorbers are set between the frame and the wheelset axle box to control the vertical movement of the wheelset and the frame; the second-order vertical and second-order lateral hydraulic shock absorbers are set between the frame and the car body to control the vertical and lateral movement between the car body and the bogie; the anti-snaking hydraulic shock absorbers are arranged longitudinally between the frame and the car body to suppress the serpentine movement of the car body. Hydraulic shock absorbers are mainly composed of rubber joints, oil storage cylinders, piston rods, pistons, dust covers, etc. After the hydraulic shock absorbers are disassembled, the air tightness of the oil storage cylinders needs to be tested to ensure that the oil storage cylinders can meet the maintenance requirements.

[0003] The airtightness test process of the existing oil pressure shock absorber oil cylinder is as follows: the operator carries the oil cylinder to be tested to the laboratory table, blocks the open end of the oil cylinder with a sealing plug with an air supply pipeline, inflates it to the test air pressure, manually immerses the entire oil cylinder in a water tank, maintains the pressure for 1 minute, and manually observes whether there are bubbles coming out of the weld on the end face of the oil cylinder. Based on the bubbles, it is determined whether the oil cylinder is leaking, thereby realizing the airtightness test of the oil cylinder.

[0004] The entire air tightness test requires the participation of on-site operators, and the degree of automation is low; when manually judging the air tightness based on bubbles, it is inevitable that there will be small and few bubbles that are difficult to observe, which affects the accuracy of the oil storage cylinder air tightness test. In addition, due to the large number of oil storage cylinders that need to be tested, operators have to frequently manually move the oil storage cylinders, press the oil storage cylinder water tanks by hand, and visually check whether there are leaks, resulting in high labor intensity for operators' maintenance work, and there are certain safety hazards in the process of moving the oil storage cylinders. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a device and method for detecting the air tightness of an oil storage cylinder of a hydraulic shock absorber.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] Provided is a device for detecting the air tightness of an oil storage cylinder of an oil pressure shock absorber, characterized in that it comprises a laboratory table, an industrial control integrated machine, a mechanical arm, an airtight press assembly and an oil storage cylinder tray;

[0008] The industrial control integrated machine is fixedly installed in the experimental table, the industrial control integrated machine is electrically connected to the mechanical arm and the airtight press assembly, and a hydraulic power unit and a high-pressure gas unit are also provided in the experimental table;

[0009] The airtight press assembly is fixedly mounted on the laboratory table, and the oil storage cylinder tray is placed on the laboratory table and is located on one side of the airtight press assembly;

[0010] The airtight press assembly includes a mounting frame, a hydraulic cylinder, a fixed clamp, a press head assembly and a displacement sensor;

[0011] The bottom of the mounting frame is fixedly connected to the laboratory table, the hydraulic cylinder is fixed to the top of the mounting frame, the hydraulic cylinder is connected to the hydraulic power unit, the pressure head assembly and the displacement sensor are installed at the output end of the hydraulic cylinder, the pressure head assembly and the hydraulic cylinder are coaxially arranged, the fixed clamp is fixedly connected to the mounting frame and is located below the hydraulic cylinder, and the hydraulic power unit and the displacement sensor are electrically connected to the industrial control integrated machine;

[0012] The fixed end of the mechanical arm is fixedly connected to the mounting frame, the holding end of the mechanical arm extends downward, and a transport clamp for grabbing the oil storage cylinder to be tested is fixedly installed on the holding end;

[0013] The high-pressure gas unit is in communication with the pressure head assembly, the fixed jaw and the transport jaw.

[0014] Compared with the prior art, the present invention has the following technical effects:

[0015] In the present application, the oil-pressure shock absorber oil storage cylinder air-tightness detection device adopts the form of combining an industrial control integrated machine with a mechanical arm, an air-tightness press assembly and an oil storage cylinder tray. The experimental table is the carrier of the detection device. The test instructions and test parameters associated with the oil-pressure shock absorber type are pre-stored in the industrial control integrated machine. After receiving the test instruction, the mechanical arm performs the clamping action of the oil storage cylinder to be tested according to the predetermined action path, and places the oil cylinder to be tested on the air-tightness press assembly. The air-tightness press assembly will fix the oil cylinder to be tested according to the test instruction, and automatically perform a series of air-tightness tests such as sealing, pressurizing, and maintaining pressure on the oil cylinder to be tested according to the test instruction and test parameters. After the test is completed, the industrial control integrated machine outputs the test results. The detection device realizes the automatic clamping, transportation, and air-tightness detection of the oil storage cylinder. Manual handling and detection operations are no longer required, which reduces the labor intensity of operators and improves the safety and efficiency of the operation process.

[0016] The present invention also provides a method for detecting the air tightness of an oil reservoir cylinder of a hydraulic shock absorber, using the oil reservoir cylinder air tightness detection device of any one of claims 1 to 8 for detection, the detection method comprising the following steps:

[0017] Selection of hydraulic shock absorber: The industrial computer screens and selects or inputs the test instructions and test parameters associated with the hydraulic shock absorber model according to the received hydraulic shock absorber model, and sends the test instructions and test parameters corresponding to the selected hydraulic shock absorber model to the robot arm and the airtight press assembly;

[0018] Oil storage cylinder transfer: the robot arm clamps the oil storage cylinder to be tested from the oil storage cylinder tray to the airtight press assembly according to the test instruction, and the airtight press assembly holds and fixes the oil storage cylinder to be tested according to the test instruction;

[0019] Automatic test of oil storage cylinder: the airtight press component seals the oil storage cylinder to be tested, pressurizes it to the test air pressure, and maintains the pressure for a preset time according to the test instructions and the test parameters, calculates the pressure change value of the gas in the oil storage cylinder before and after the pressure maintenance, compares the calculated pressure change value with the standard pressure change value associated with the oil pressure shock absorber model, determines whether the oil storage cylinder to be tested is qualified based on the comparison result, and outputs the test result;

[0020] Oil storage cylinder resetting: the airtight press assembly releases the oil storage cylinder according to the test instruction, and the robotic arm resets the oil storage cylinder that has been tested on the airtight press assembly to the oil storage cylinder tray according to the test instruction.

[0021] The technical effect of the detection method using the oil pressure shock absorber oil storage cylinder air tightness detection device in the present invention is consistent with the effect of the oil pressure shock absorber oil storage cylinder air tightness detection device, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 Schematic diagram of an oil storage cylinder air tightness detection device for an oil pressure shock absorber according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the medium airtightness press assembly;

[0025] Figure 3 for Figure 1 Schematic diagram of the fixed jaws;

[0026] Figure 4 for Figure 3A top view of the fixed jaws;

[0027] Figure 5 for Figure 1 Schematic diagram of the transfer gripper;

[0028] Figure 6 for Figure 5 Top view of the middle transfer gripper;

[0029] Figure 7 for Figure 1 Diagram of the center oil storage tank tray;

[0030] Figure 8 is a pneumatic principle diagram of the detection device in this embodiment;

[0031] Fig. 9 It is a schematic flow chart of the method for detecting the air tightness of the oil storage cylinder of the oil pressure shock absorber in this embodiment.

[0032] Reference numerals:

[0033] 1-air filter, 2-pressure reducing valve, 3-air supply solenoid valve, 4-sensor, 5-exhaust solenoid valve, 6-muffler, 7-three-position five-way solenoid valve, 8-air pipe, 9-speed regulating valve, 10-laboratory table, 11-manual control console, 20-industrial control integrated machine, 30-mechanical arm, 31-transport clamp, 311-centering cylinder, 312-mounting plate, 313-second clamp, 40-airtight press assembly, 41-mounting frame, 4 11-water storage tank, 412-water inlet pipe, 413-drain pipe, 42-hydraulic cylinder, 43-fixed clamp, 431-clamp cylinder, 432-clamp seat, 433-first clamp, 44-pressure head assembly, 45-displacement sensor, 46-guide rail slider, 47-mounting seat, 48-drag chain, 50-oil storage cylinder tray, 51-tray body, 52-handle, 53-placement hole, 54-positioning hole, 60-oil storage cylinder to be tested. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figures 1 to 7 As shown, the oil reservoir cylinder air tightness detection device for a hydraulic shock absorber provided in an embodiment of the present invention comprises a laboratory table 10, an industrial control integrated machine 20, a mechanical arm 30, an airtight press assembly 40 and an oil reservoir cylinder tray 50;

[0040] The industrial control integrated machine 20 is fixedly installed on the experimental table 10, and the industrial control integrated machine 20 is electrically connected to the mechanical arm 30 and the airtight press assembly 40. A hydraulic power unit and a high-pressure gas unit are also provided in the experimental table;

[0041] The airtight press assembly 40 is fixedly mounted on the laboratory table 10 , and the oil storage cylinder tray 50 is placed on the laboratory table 10 and is located on one side of the airtight press assembly 40 ;

[0042] The airtight press assembly includes a mounting frame, a hydraulic cylinder, a fixed clamping jaw, a press head assembly and a displacement sensor;

[0043] The airtight press assembly 40 includes a mounting frame 41, a hydraulic cylinder 42, a fixed clamp 43, a pressure head assembly 44 and a displacement sensor 45; the bottom of the mounting frame 41 is fixedly connected to the experimental table 10, the body of the hydraulic cylinder 42 is fixed to the top of the mounting frame 41, the displacement sensor 45 and the pressure head assembly 44 are installed at the output end of the hydraulic cylinder 42, the pressure head assembly 44 is coaxially arranged with the hydraulic cylinder 42, the fixed clamp 43 is fixedly connected to the mounting frame 41 and is located directly below the hydraulic cylinder 42, the hydraulic power unit and the displacement sensor 45 of the hydraulic cylinder 42 are electrically connected to the industrial control integrated machine 20, and the pressure head assembly 44 is provided with an air injection hole connected to the air source;

[0044] The fixed end of the mechanical arm is fixed on the mounting frame, the holding end of the mechanical arm extends downward, and a transfer clamp for grabbing the oil storage cylinder to be tested is fixedly installed on the holding end;

[0045] The high-pressure gas unit is connected with the gas injection hole, the fixed clamping jaw and the transport clamping jaw of the pressure head assembly.

[0046] The mounting frame 41 provides a mounting base for the hydraulic cylinder 42, and also reserves sufficient space for the movement of the output end of the hydraulic cylinder 42 and the installation of the oil storage cylinder. In order to ensure the experimental effect, the mounting frame 41 is installed vertically. The mounting frame 41 is preferably a C-shaped structure. The hydraulic cylinder 42 is installed on the top of the mounting frame 41. A water storage tank 411 is reserved directly below. After replenishing water, the air tightness of the oil storage cylinder can be judged by checking whether there are bubbles. The industrial control integrated machine 20 controls the operation of the hydraulic cylinder 42 by sending instructions to the hydraulic cylinder 42 or the hydraulic cylinder 42 controller, and determines the working stroke of the hydraulic cylinder 42 by the moving distance of the displacement sensor 45.

[0047] When implementing:

[0048] The oil reservoir air tightness detection device for the oil shock absorber provided in this embodiment is mainly composed of a laboratory table 10, an industrial control integrated machine 20, an air tightness press assembly 40, a mechanical arm 30, an oil reservoir tray 50, etc. A storage bin with an opening and closing door is provided below the operating surface of the laboratory table 10, and an air source and an air pipeline connecting the air source with the air tightness press assembly and the gripper on the mechanical arm are provided in the storage bin.

[0049] The experimental table 10 is provided with a placement base, on which a positioning pin (not shown) is provided, and a positioning hole 54 matching the positioning pin is provided on the tray body 51 of the oil storage cylinder tray 50, and the oil storage cylinder tray 50 is positioned in a diagonal arrangement. The tray body 51 is provided with a placement hole 53 matching the oil storage cylinder, and the oil storage cylinder to be tested is placed in the corresponding placement hole 53, and the oil storage cylinder tray 50 is manually placed on the placement base of the experimental table 10, and the oil storage cylinders are then manually placed in the corresponding placement holes 53 one by one.

[0050] The experimental table 10 is equipped with an industrial control integrated machine 20, which pre-stores the oil pressure shock absorber model (the oil pressure shock absorber model and the oil storage cylinder are in a one-to-one correspondence), as well as the test instructions and test parameters associated with the oil pressure shock absorber model. The test instructions include the robot arm grabbing the oil storage cylinder, transferring the oil storage cylinder, the airtight press assembly (fixed clamp) tightening the oil storage cylinder, the robot arm releasing the oil storage cylinder reset, the airtight press assembly sealing the oil storage cylinder, gas injection pressurization, pressure maintenance, air pressure difference calculation, robot arm grabbing the oil storage cylinder reset, etc. The test parameters include the hydraulic cylinder downward stroke, pressure maintenance air pressure value, pressure maintenance time, standard pressure change value, etc. The industrial control integrated machine 20 will send test instructions and test parameters to the robot arm 30 and the airtight press assembly 40. The robot arm 30 can assist the operator in clamping and replacing the oil storage cylinder to be tested, and the oil storage cylinder tray 50 can cache the oil storage cylinder to be tested.

[0051] The airtight press assembly 40 is provided with a pressure head assembly 44 that seals the oil storage cylinder and is equipped with an air injection hole, a displacement sensor 45 that detects the downward movement of the output end of the hydraulic cylinder 42, the hydraulic cylinder 42 that drives the pressure head assembly 44 to move up and down, and a fixed clamp 43 that can vertically clamp the oil storage cylinder. The displacement sensor 45 can be selected as a pull rope displacement sensor, the body of which is installed on the mounting frame 41, and the pull rope end of which is fixedly connected to the pressure head assembly 44. Under the action of the hydraulic cylinder 42, the pressure head assembly 44 will fit tightly with the oil storage cylinder to achieve sealing, and fill the oil storage cylinder with compressed air through the air injection hole connected to the air source, so that the air pressure in the oil storage cylinder reaches the pressure holding pressure value included in the test parameters. The built-in pressure sensor of the pressure head assembly 44 can detect the air pressure in the oil storage cylinder, and the oil storage cylinder is pressurized according to the pressure holding time included in the test parameters. The industrial control integrated machine 20 will obtain the air pressure values ​​before and after the oil storage cylinder is pressurized, and judge whether the air tightness of the oil storage cylinder is qualified according to the comparison result of the pressure change value before and after the air pressure and the standard pressure change value.

[0052] Alternatively, by means of manual visual inspection, the welding position of the oil storage cylinder is immersed in a stainless steel water tank provided at the bottom of the airtight press assembly 40, and the operator can judge whether there is leakage in the oil storage cylinder by the appearance of bubbles.

[0053] The working principle of the oil pressure shock absorber oil storage cylinder air tightness detection device is as follows:

[0054] 1) The model of the oil storage cylinder is stored in the industrial control integrated computer 20. The industrial control integrated computer 20 can automatically select the stroke of the hydraulic cylinder 42 that matches the oil storage cylinder model according to the selected or input oil storage cylinder model, and control the hydraulic cylinder 42 to automatically stop in place through the numerical feedback of the displacement sensor 45. The stroke of the hydraulic cylinder 42 is related to the model of the oil storage cylinder. The diameters and lengths of oil storage cylinders of different models are different. By setting a reasonable stroke of the hydraulic cylinder 42, the sealing effect of the oil storage cylinder can be effectively guaranteed, and the accuracy of the oil storage cylinder sealing detection can be guaranteed.

[0055] 2) After the oil cylinder model is selected or input, confirm that the oil cylinders on the oil cylinder tray 50 are placed correctly and meet the requirements of automated operation, press the automatic button (manual control console 11), and the robot arm 30 will take the oil cylinders stored on the oil cylinder tray 50 in turn according to the test instructions (program settings) and transfer them to the bottom of the airtight press assembly 40; after the robot arm 30 completes the action, the fixed clamp 43 of the airtight press assembly 40 starts to automatically clamp the oil cylinder.

[0056] 3) After the industrial control integrated machine 20 detects that the air pressure of the fixed clamp 43 is stable, it determines that the fixed clamp 43 has completed the action, starts the airtight press assembly 40, and the hydraulic cylinder 42 automatically descends to the set position and stops moving. At this time, the pressure head assembly 44 is tightly fitted with the open end face of the oil storage cylinder, meeting the airtight conditions required for the test.

[0057] In order to determine the clamping effect of the fixed clamp 43, a pressure sensor is provided in the air circuit of the clamp cylinder 431 to detect the pressure of the clamp air circuit. When the first clamp 433 performs the clamping action, the pressure will be adjusted. After the clamping action is completed, the pressure in the air circuit is stable, and it is determined that the clamping action is completed. The airtight press assembly 40 has two operating modes: "manual" and "automatic". When the manual mode is selected, the downward pressure of the press is controlled by a button. When the automatic mode is selected, the control of the press is controlled by the industrial control integrated machine 20.

[0058] Before work, it is necessary to set the type of test piece to be tested on the industrial computer. The industrial computer configures the allowable parameters (test parameters) of the robot arm 30 and the airtight press assembly 40 according to the model of the oil storage cylinder to be tested. In automatic mode, the robot arm 30 and the airtight press assembly 40 automatically run according to the predetermined program (test instructions) and parameters (test parameters), and the operator monitors at the workstation.

[0059] The specific actions in automatic mode are as follows:

[0060] (1) The operator confirms that the pallet and the oil storage cylinder are in place, selects the type of oil storage cylinder to be tested in the maintenance system of the industrial control integrated machine 20, selects the automatic mode, clicks start, and the system will automatically perform the air tightness test of the oil storage cylinder.

[0061] (2) The robot arm 30 clamps the oil storage cylinder according to a predetermined action path and places it at a predetermined position. After the robot arm 30 is in place, the clamping jaw cylinder 431 of the fixed clamping jaw 43 configured on the airtight press assembly 40 is actuated, and the system detects the air circuit pressure of the clamping jaw cylinder 431; after the pressure stabilizes, the airtight press assembly 40 performs a downward pressing action, and the displacement sensor 45 detects the downward pressing distance of the hydraulic cylinder 42 on the airtight press assembly 40; after the hydraulic cylinder 42 is pressed down to the position, the air supply line is opened to inflate the oil storage cylinder. After the inflation is completed, the system detects the gas pressure in the oil storage cylinder. After maintaining the pressure for 1 minute, the system calculates the pressure change value within 1 minute and determines whether the airtightness of the oil storage cylinder is qualified.

[0062] (3) After the air tightness test is completed, the exhaust gas circuit is opened, and after the system detects that the gas pressure in the oil storage cylinder is 0, the hydraulic cylinder 42 performs the rising action, and the displacement sensor 45 detects the rising distance of the hydraulic cylinder 42; after the hydraulic cylinder 42 rises to the position, the robot arm 30 runs to the predetermined position and clamps the oil storage cylinder; after the above actions are completed, the fixed clamping claw 43 configured on the airtight press assembly 40 is released, and the system detects the gas circuit pressure of the clamping claw cylinder 431; after the pressure stabilizes, the robot arm 30 clamps the oil storage cylinder and places it at the corresponding position of the pallet.

[0063] (4) The oil storage cylinder air tightness test will be carried out in sequence. Every three cycles, the robot arm 30 will complete three clampings according to the set path. After the three clampings are completed, the parameter information of the test piece needs to be reset.

[0064] The specific actions in manual mode are as follows:

[0065] 1) Select or input the oil storage cylinder model in the industrial control integrated computer 20, and the built-in system of the industrial control integrated computer 20 will automatically select the stroke of the hydraulic cylinder 42 that matches the oil storage cylinder model, and control the hydraulic cylinder 42 to stop automatically when it reaches the position through the numerical feedback of the displacement sensor 45.

[0066] 2) After the oil cylinder model is selected or input, confirm that the oil cylinders on the oil cylinder tray 50 are placed correctly and meet the requirements of automated operation, press the manual button (manual control console 11), and the robot arm 30 will take the oil cylinders stored on the oil cylinder tray 50 in turn according to the test instructions (program settings) and transfer them to the bottom of the airtight press assembly 40; after the robot arm 30 completes the action, the fixed clamp 43 of the airtight press assembly 40 starts to automatically clamp the oil cylinder.

[0067] 3) After the industrial control integrated machine 20 detects that the air pressure of the fixed clamp 43 is stable, it determines that the fixed clamp 43 has completed the action, starts the airtight press assembly 40, and the hydraulic cylinder 42 automatically descends to the set position and stops moving. At this time, the pressure head assembly 44 is tightly fitted with the open end face of the oil storage cylinder, meeting the airtight conditions required for the test.

[0068] 4) After the operator determines that the air tightness test conditions are met, he presses the air inlet button, and 0.6MPa compressed gas is filled into the oil storage cylinder through the pressure head assembly 44. At this time, under the downward pressure of the pressure head assembly 44, the lower welding position of the oil storage cylinder is immersed in the stainless steel water tank, and the operator can observe whether there is obvious leakage;

[0069] 5) After observing that there is no obvious leakage, the operator presses the pressure-maintaining button and the system automatically maintains the pressure for 1 minute. During this period, the changes in the air pressure in the oil storage cylinder are recorded. The leakage is not more than 1KPa, which is qualified.

[0070] 6) After the test is completed, press the exhaust button and the system will automatically exhaust. After the exhaust is completed, the pressure head assembly 44 of the airtight press assembly 40 rises under the action of the hydraulic cylinder 42 and separates from the oil storage cylinder. The robotic arm 30 automatically moves into position to clamp the oil storage cylinder. After the robotic arm 30 is in position, the fixed clamp 43 is released. After detecting that the fixed clamp 43 is released, the robotic arm 30 transfers the tested oil storage cylinder to the oil storage cylinder tray 50 through the transfer clamp, and clamps the next oil storage cylinder to prepare for the test.

[0071] 7) The manual control console 11 of the experimental table 10 is provided with 4 knobs and an emergency stop button, which can respectively control the automatic / manual test of the robot arm 30, the clamping / releasing action of the clamping jaw assembly, the descending / stopping / ascending action of the airtight press assembly 40, and the inflation / pressure maintenance / exhaustion action of the oil storage cylinder barrel; the manual mode can be selected to manually complete the clamping of the oil storage cylinder.

[0072] The air circuit principles of the transport clamp 31 and the airtight press assembly 40 are respectively described below.

[0073] The gas circuit principle of the detection device is as follows Figure 8 As shown: the gas circuit schematic diagram is provided with an air filter 1, a pressure reducing valve 2, an air supply solenoid valve 3, a sensor 4, an exhaust solenoid valve 5, a muffler 6, a three-position five-way solenoid valve 7, an air pipe 8, and a speed regulating valve 9. Different components are connected through the air pipe 8.

[0074] The working principle of the gas circuit system of the detection device is as follows: Figure 8It can be determined that the detection device includes three gas circuits, namely the oil storage cylinder test gas circuit, the robot arm transfer jaw gas circuit and the airtight press fixed jaw gas circuit. The gas of the high-pressure gas unit is processed by the air filter 1 and then supplied to the pressure head assembly, the robot arm transfer jaw and the airtight press assembly fixed jaw. During the air tightness test, the pressure head assembly forms a closed space with the oil storage cylinder, and compressed air is supplied to the oil storage cylinder through the pressure reducing valve 2 and the air supply solenoid valve 3. The pressure sensor 4 detects the gas pressure inside the oil storage cylinder. After the air supply solenoid valve 3 is closed, the exhaust solenoid valve 5 is opened, and the compressed gas in the oil storage cylinder is discharged through the exhaust solenoid valve 5; the transfer clamp of the robot arm and the fixed clamp of the airtight press assembly share a pressure reducing valve 2, and the operating principle is similar. The compressed air is supplied to the cylinder of the transfer clamp or the fixed clamp through the pressure reducing valve 2 and the left position of the three-position five-way solenoid valve 7. The pressure sensor 4 detects the gas pressure of the air supply air path of the transfer clamp or the fixed clamp. After the three-position five-way solenoid valve 7 is switched to the right position, the compressed gas is discharged through the right exhaust port of the three-position five-way solenoid valve 7; in the air path system, the muffler 6 is installed at the exhaust port of the exhaust solenoid valve 5 and the three-position five-way solenoid valve 7 to reduce the exhaust noise, and the speed regulating valve 9 is installed at the air inlet / exhaust port of the cylinder of the transfer clamp or the fixed clamp to adjust the action rate of the transfer clamp or the fixed clamp.

[0075] The gas system control method of the detection device is as follows:

[0076] 1. After the pressure head assembly is pressed down into place, the air supply solenoid valve 3 is opened, and 600kPa of compressed gas is rushed into the oil storage cylinder. After the pressure sensor 4 in the gas circuit detects that the pressure is stable, the air supply solenoid valve 3 is closed; after stabilizing the pressure for 1 minute, the pressure change value is recorded; the exhaust solenoid valve 5 is opened, and when the pressure reaches 0kPa, the exhaust solenoid valve 5 is closed.

[0077] 2. After the robotic arm moves to the oil storage cylinder clamping position, the three-position five-way solenoid valve 7 of the transfer clamp is energized in the left position, and the transfer clamp performs the clamping action. After the pressure sensor 4 in the air circuit detects that the pressure is stable, it indicates that the transfer clamp tightens the oil storage cylinder, and the robotic arm transfers the oil storage cylinder to the next working position; after reaching the next working position, the three-position five-way solenoid valve 7 of the transfer clamp is energized in the right position, and the transfer clamp performs the releasing action. After the pressure sensor 4 detects that the pressure is stable, the robotic arm returns to the initial position.

[0078] 3. After the oil storage cylinder is transferred into position by the robotic arm, the left position of the three-position five-way solenoid valve 7 of the fixed jaw of the airtight press is energized, and the fixed jaw performs a clamping action. After the pressure sensor 4 in the air circuit detects that the pressure is stable, the robotic arm transfer jaw is released to prepare for an airtight test; after the airtight test is completed, the fixed jaw of the robotic arm is in place and clamps the oil storage cylinder, the right position of the three-position five-way solenoid valve 7 of the fixed jaw is energized, and the fixed jaw performs a loosening action. After the air circuit pressure sensor 4 of the robotic arm transfer jaw detects that the pressure is stable, the robotic arm clamps the oil storage cylinder and places it on the oil storage cylinder tray.

[0079] In the present application, the oil-pressure shock absorber oil storage cylinder air-tightness detection device adopts the form of combining an industrial control integrated machine with a mechanical arm, an air-tightness press assembly and an oil storage cylinder tray. The experimental table is the carrier of the detection device. The test instructions and test parameters associated with the oil-pressure shock absorber type are pre-stored in the industrial control integrated machine. After receiving the test instruction, the mechanical arm performs the clamping action of the oil storage cylinder to be tested according to the predetermined action path, and places the oil cylinder to be tested on the air-tightness press assembly. The air-tightness press assembly will fix the oil cylinder to be tested according to the test instruction, and automatically perform a series of air-tightness tests such as sealing, pressurizing, and maintaining pressure on the oil cylinder to be tested according to the test instruction and test parameters. After the test is completed, the industrial control integrated machine outputs the test results. The detection device realizes the automatic clamping, transportation, and air-tightness detection of the oil storage cylinder. Manual handling and detection operations are no longer required, which reduces the labor intensity of operators and improves the safety and efficiency of the operation process.

[0080] As an implementable embodiment, the airtight press assembly 40 also includes a pressure sensor; the pressure sensor is arranged in the air circuit connecting the high-pressure gas unit with the pressure head assembly, the fixed clamp and the transfer clamp, and the pressure sensor is connected to the industrial control integrated electromechanical 20.

[0081] By setting up a pressure sensor, after the pressure head assembly seals and pressurizes the oil storage cylinder, the air pressure value in the air circuit can be sent to the industrial control integrated machine 20. The industrial control integrated machine 20 determines the air tightness of the oil storage cylinder based on the change in value before and after pressure maintenance, and there is no need for manual visual inspection of the air tightness of the oil storage cylinder through bubbles.

[0082] As an implementable embodiment, the fixed clamp 43 includes a clamp cylinder 431, a clamp seat 432 and a first clamp 433; the clamp cylinder 431 is fixedly installed near the bottom of the mounting frame 41, and there are two clamp seats 432 and first clamps 433. The clamp seat 432 is fixedly connected to the output ends on both sides of the clamp cylinder 431, and the first clamp 433 is fixed on the inner side of the clamp seat 432. The two first clamps 433 are symmetrically arranged facing each other, and the clamp cylinder 431 is connected to an external air source through a first air path.

[0083] The clamping jaw cylinder 431 can drive the first clamping jaw 433 to open outward or clamp inward through the clamping jaw seat 432. In order to ensure the supporting effect on the oil storage cylinder, a V-shaped groove is provided on the side of the first clamping jaw 433 away from the clamping jaw seat 432 to ensure stable support for the oil storage cylinder. In order to better cooperate with the pressure head assembly 44 on the oil storage cylinder, the axis of the oil storage cylinder coincides with the center line of the two first clamping jaws 433 to ensure that when the pressure head assembly 44 is pressed down, it can smoothly penetrate into the opening of the oil storage cylinder to achieve the sealing of the oil storage cylinder. In order to achieve gas pressurization of the oil storage cylinder, an injection hole connected to the external gas source is also provided on the pressure head assembly 44, and the pressure of the gas injection and the injected gas is controlled by the industrial control integrated machine 20. The clamping jaw cylinder 431 can be controlled by the industrial control integrated machine 20 using a test instruction, or it can be controlled by a manual start button. The external gas source is arranged in the experimental table 10.

[0084] As an implementable embodiment, the airtight press assembly 40 also includes a guide rail slider 46 and a mounting seat 47; the guide rail slider 46 is fixedly connected to the mounting frame 41 and is arranged along the movement direction of the output end of the hydraulic cylinder 42 (arranged along the length direction of the mounting frame 41), and the two ends of the mounting seat 47 are respectively fixedly connected to the output end of the hydraulic cylinder 42 and the slider of the guide rail slider 46.

[0085] The arrangement of the guide rail slider 46 and the mounting seat 47 provides a guiding function for the output end of the hydraulic cylinder 42, ensuring the stability of the hydraulic cylinder driving the pressure head assembly 44 to move up and down, as well as the sealing effect on the oil storage cylinder.

[0086] As an implementable embodiment, the airtight press assembly 40 also includes a drag chain 48; both ends of the drag chain 48 are respectively fixedly connected to the mounting seat 47 and the mounting frame 41 near the top, and the gas pipeline connected to the pressure head assembly 44 is arranged in the drag chain 48.

[0087] The provision of the drag chain 48 provides protection for the gas pipeline connected to the pressure head assembly 44 .

[0088] As an implementable embodiment, the transport clamp 31 includes a centering cylinder 311, a mounting plate 312 and a second clamp 313; the centering cylinder 311 is fixedly connected to the robot arm 30 through a flange, there are two mounting plates 312 and second clamps 313, the mounting plate 312 is fixedly connected to the output ends on both sides of the centering cylinder 311, the second clamp 313 is fixed on the inner side of the mounting plate 312, the two second clamps 313 are symmetrically arranged facing each other, and the centering cylinder 311 is connected to an external air source through a second air path.

[0089] The centering cylinder 311 can control the outward or toward movement of the second clamping jaw 313 by driving the mounting plate 312. The second clamping jaw 313 opens when moving outward, and supports the oil storage cylinder when moving toward each other. The opening and supporting are realized through the control of the central control integrated machine.

[0090] As an implementable embodiment, the oil storage cylinder tray 50 includes a tray body 51 and a handle 52; the handle 52 is arranged on both sides of the tray body 51, and a plurality of placement holes 53 are arranged in the middle of the tray body 51, and the placement holes 53 are evenly arranged on the tray body 51, and the tray body 51 is also provided with positioning holes 54; a placement base is provided on the experimental table 10, and a positioning pin matching the positioning hole 54 is provided on the placement base, and a groove is provided in the middle of the placement base.

[0091] The arrangement of the placement hole 53 on the tray body 51 realizes the placement and fixation of the oil storage cylinder, and the arrangement of the handle 52 facilitates the movement of the oil storage cylinder tray 50 and the alignment and placement on the placement base. The arrangement of the groove on the placement base reserves space for the placement and fixation of the oil storage cylinder, and can also provide certain support for the oil storage cylinder, thereby reducing the pressure on the oil storage cylinder tray 50.

[0092] As an implementable embodiment, the airtight press assembly 40 further includes a water tank 411 ; the water tank 411 is disposed at the bottom of the mounting frame 41 , and a water inlet pipe 412 and a drain pipe 413 are disposed on the water tank 411 .

[0093] The water tank 411 is provided for manually checking the air tightness of the oil storage cylinder. When in use, water is injected into the water tank 411 through the water inlet pipe 412, and the weld of the oil storage cylinder is submerged below the water surface. The air tightness of the oil storage cylinder is determined by observing whether bubbles emerge.

[0094] like Fig. 9 As shown, based on the oil pressure shock absorber oil storage cylinder air tightness detection device, a method for detecting the air tightness of the oil pressure shock absorber oil storage cylinder is also provided, and the detection method includes the following steps:

[0095] Selection of hydraulic shock absorber: The industrial computer screens and selects or inputs the test instructions and test parameters associated with the hydraulic shock absorber model according to the received hydraulic shock absorber model, and sends the test instructions and test parameters corresponding to the selected hydraulic shock absorber model to the robot arm and the airtight press assembly;

[0096] Oil storage cylinder transfer: The robot arm clamps the oil storage cylinder to be tested from the oil storage cylinder tray to the airtight press assembly according to the test instructions, and the airtight press assembly holds and fixes the oil storage cylinder to be tested according to the test instructions;

[0097] Automatic test of oil storage cylinder: The airtightness press component seals the oil storage cylinder to be tested, pressurizes it to the test air pressure, and maintains the pressure for a preset time according to the test instructions and test parameters. It calculates the pressure change value of the gas in the oil storage cylinder before and after the pressure maintenance, and compares the calculated pressure change value with the standard pressure change value associated with the oil pressure shock absorber model. Based on the comparison result, it determines whether the oil storage cylinder to be tested is qualified and outputs the test result;

[0098] Oil storage cylinder reset: The airtight press assembly releases the oil storage cylinder according to the test instructions, and the robotic arm resets the oil storage cylinder that has been tested on the airtight press assembly to the oil storage cylinder tray according to the test instructions.

[0099] As an implementable embodiment, the detection method further comprises the following steps:

[0100] Repeat the oil storage cylinder automatic test and oil storage cylinder reset operation until all oil storage cylinders on the oil storage cylinder tray are tested.

[0101] By repeating the steps of automatic testing of the oil storage cylinder and resetting the oil storage cylinder, the air tightness detection of multiple oil storage cylinders of the same model on the oil storage cylinder tray can be realized.

[0102] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0103] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for detecting the air tightness of an oil storage cylinder of a hydraulic shock absorber, characterized in that: Includes a lab table, an industrial computer, a robotic arm, an airtight press assembly, and an oil storage tank tray; The industrial control integrated machine is fixedly installed in the experimental table, the industrial control integrated machine is electrically connected to the mechanical arm and the airtight press assembly, and a hydraulic power unit and a high-pressure gas unit are also provided in the experimental table; The airtight press assembly is fixedly mounted on the laboratory table, and the oil storage cylinder tray is placed on the laboratory table and is located on one side of the airtight press assembly; The airtight press assembly includes a mounting frame, a hydraulic cylinder, a fixed clamp, a press head assembly and a displacement sensor; The bottom of the mounting frame is fixedly connected to the laboratory table, the hydraulic cylinder is fixed to the top of the mounting frame, the hydraulic cylinder is connected to the hydraulic power unit, the pressure head assembly and the displacement sensor are installed at the output end of the hydraulic cylinder, the pressure head assembly and the hydraulic cylinder are coaxially arranged, the fixed clamp is fixedly connected to the mounting frame and is located below the hydraulic cylinder, and the hydraulic power unit and the displacement sensor are electrically connected to the industrial control integrated machine; The fixed end of the mechanical arm is fixedly connected to the mounting frame, the holding end of the mechanical arm extends downward, and a transport clamp for grabbing the oil storage cylinder to be tested is fixedly installed on the holding end; The high-pressure gas unit is in communication with the pressure head assembly, the fixed jaw and the transport jaw.

2. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1 is characterized in that: The airtight press assembly also includes a pressure sensor; The pressure sensor is arranged in the gas path connecting the high-pressure gas unit and the pressure head assembly, the fixed clamp and the transport clamp, and the pressure sensor is electrically connected to the industrial control all-in-one machine.

3. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1, characterized in that: The fixed clamping jaw comprises a clamping jaw cylinder, a clamping jaw seat and a first clamping jaw; The clamping cylinder is fixedly installed at a position near the bottom of the mounting frame. There are two clamping seats and two first clamping jaws. The clamping seat is fixedly connected to the output ends on both sides of the clamping cylinder. The first clamping jaw is fixed on the inner side of the clamping seat. The two first clamping jaws are symmetrically arranged facing each other. The clamping cylinder is connected to an external air source through a first air path.

4. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1, characterized in that: The airtight press assembly also includes a guide rail slider and a mounting seat; The guide rail slider is fixedly connected to the mounting frame and is arranged along the movement direction of the output end of the hydraulic cylinder. The two ends of the mounting seat are respectively fixedly connected to the output end of the hydraulic cylinder and the slider of the guide rail slider.

5. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 4, characterized in that: The airtight press assembly also includes a drag chain; The two ends of the drag chain are respectively fixedly connected to the mounting seat and the mounting frame near the top, and the gas pipeline connected to the pressure head assembly is arranged in the drag chain.

6. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1, characterized in that: The transport clamp comprises a centering cylinder, a mounting plate and a second clamp; The centering cylinder is fixedly connected to the robot arm via a flange, there are two mounting plates and two second clamps, the mounting plate is fixedly connected to the output ends on both sides of the centering cylinder, the second clamps are fixed on the inner side of the mounting plate, the two second clamps are symmetrically arranged facing each other, and the centering cylinder is connected to an external air source via a second air circuit.

7. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1, characterized in that: The oil storage cylinder pallet comprises a pallet body and a handle; The handles are arranged on both sides of the tray body, a plurality of placement holes are arranged in the middle of the tray body, the placement holes are evenly arranged on the tray body, and a positioning hole is also arranged on the tray body; The experimental table is provided with a placement base, the placement base is provided with a positioning pin matching the positioning hole, and the middle part of the placement base is provided with a groove.

8. The oil pressure shock absorber oil storage cylinder air tightness detection device according to claim 1, characterized in that: The airtight press assembly also includes a water storage tank; The water storage tank is arranged at the bottom of the mounting frame, and a water inlet pipe and a drain pipe are arranged on the water storage tank.

9. A method for detecting the air tightness of an oil storage cylinder of an oil pressure shock absorber, characterized in that: The oil pressure shock absorber oil storage cylinder air tightness detection device according to any one of claims 1 to 8 is used for detection, and the detection method comprises the following steps: Selection of hydraulic shock absorber: The industrial computer screens and selects or inputs the test instructions and test parameters associated with the hydraulic shock absorber model according to the received hydraulic shock absorber model, and sends the test instructions and test parameters corresponding to the selected hydraulic shock absorber model to the robot arm and the airtight press assembly; Oil storage cylinder transfer: the robot arm clamps the oil storage cylinder to be tested from the oil storage cylinder tray to the airtight press assembly according to the test instruction, and the airtight press assembly holds and fixes the oil storage cylinder to be tested according to the test instruction; Automatic test of oil storage cylinder: the airtight press component seals the oil storage cylinder to be tested, pressurizes it to the test air pressure, and maintains the pressure for a preset time according to the test instructions and the test parameters, calculates the pressure change value of the gas in the oil storage cylinder before and after the pressure maintenance, compares the calculated pressure change value with the standard pressure change value associated with the oil pressure shock absorber model, determines whether the oil storage cylinder to be tested is qualified based on the comparison result, and outputs the test result; Oil storage cylinder resetting: the airtight press assembly releases the oil storage cylinder according to the test instruction, and the robotic arm resets the oil storage cylinder that has been tested on the airtight press assembly to the oil storage cylinder tray according to the test instruction.

10. The method for detecting air tightness of an oil reservoir of a hydraulic shock absorber according to claim 9, characterized in that: The detection method also includes the following steps: Repeat the oil storage cylinder automatic test and oil storage cylinder reset operation until all oil storage cylinders on the oil storage cylinder tray are tested.

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