Hydraulic cylinder module inspection system

Abstract

The invention discloses a hydraulic cylinder module inspection system, and belongs to the technical field of hydraulic cylinder detection. Comprising a driving unit, a detection unit and an electric control unit which are arranged on a bearing unit, the electric control unit comprises an industrial control all-in-one machine, an electric appliance control element and power distribution equipment of the industrial control all-in-one machine are arranged on one side in the bearing unit, and the driving unit and the detection unit are arranged on the other side in the bearing unit; the driving unit comprises a servo motor and a servo driver, the servo motor is connected with a bidirectional hydraulic pump through a coupler and drives an oil cylinder to be tested through the bidirectional hydraulic pump, and a displacement sensor is arranged on the oil cylinder to be tested; the detection unit comprises an integrated valve block A, an oil pipeline and an integrated valve block B which are sequentially communicated with the two-way hydraulic pump through oil ways. Detection on the displacement of the oil cylinder to be detected is added in the system, the servo motor is controlled to intermittently supplement oil to the oil cylinder through displacement detection, and oil cylinder pressure changes caused by internal leakage of the oil cylinder which is stopped for a long time can be corrected.

Description

Technical Field

[0001] The invention relates to a testing system for testing and detecting the performance of a hydraulic cylinder, in particular to a hydraulic cylinder module testing system, and belongs to the technical field of hydraulic cylinder detection. Background Art

[0002] The working principle of hydraulic cylinder detection is to use the principle of hydraulic transmission to test the various performance indicators of the hydraulic system through the pressure and flow of hydraulic oil; it is mainly composed of hydraulic pump, oil tank, pressure gauge, flow meter, hydraulic cylinder, control valve and other components. When the hydraulic pump is started, it will suck the hydraulic oil from the oil tank and then transport it to the hydraulic cylinder through the pipeline. Under the action of the hydraulic oil, the hydraulic cylinder will generate corresponding pressure and displacement, thereby realizing the load on the hydraulic system being tested; during the test, the hydraulic test bench will monitor the pressure and flow of the hydraulic system through the pressure gauge and flow meter. By analyzing these data, various performance indicators of the hydraulic system can be obtained, such as maximum pressure, maximum flow, pressure stability, flow stability, etc.

[0003] At present, the existing hydraulic cylinder inspection system is unable to correct the cylinder pressure change caused by internal leakage of the cylinder that has been parked for a long time. When the cylinder reaches the specified position, the balance valve maintains the current position. If it is parked for a long time, the cylinder position changes due to internal leakage, the cylinder pressure will decrease, and then affect the performance stability of the hydraulic cylinder. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and provide a hydraulic cylinder module inspection system, which adds the detection of the displacement of the cylinder to be tested, controls the servo motor to intermittently replenish oil to the cylinder through displacement detection, and can correct the cylinder pressure change caused by internal leakage of the cylinder that has been parked for a long time.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hydraulic cylinder module inspection system, comprising a driving unit, a detection unit and an electrical control unit arranged on a carrying unit, the electrical control unit comprising an industrial control all-in-one computer with a control program and a display screen, wherein an electrical control element and a power distribution device of the industrial control all-in-one computer are arranged on one side inside the carrying unit, a display screen of the industrial control all-in-one computer in communication connection with the electrical control element is arranged on one side of the upper part of the carrying unit, and a driving unit and a detection unit are arranged on the other side inside the carrying unit; The driving unit includes a servo motor and a servo driver. The servo motor is connected to a bidirectional hydraulic pump through a coupling, and drives the oil cylinder to be tested through the bidirectional hydraulic pump. A displacement sensor is arranged on the oil cylinder to be tested. The detection unit comprises an integrated valve block A, an oil pipeline and an integrated valve block B which are sequentially connected to the bidirectional hydraulic pump through an oil circuit, wherein the integrated valve block A is provided with a relief valve, a suction and discharge valve, a one-way valve, a balancing valve and a pressure sensor in pairs, and the integrated valve block B is provided with four electromagnetic ball valves and four pressure sensors, and the integrated valve block A and the integrated valve block B are both connected with an oil pipeline connecting the two through a slipknot joint, and a turbine flowmeter is provided on the oil pipeline; An oil tank is arranged at the lower part of the integrated valve block A. The oil tank is connected with the bidirectional hydraulic pump and the integrated valve block A through oil circuits respectively. A micro pump group is also arranged on the oil tank.

[0006] The upper end surface of the integrated valve block A is respectively provided with an overflow valve mounting hole, a suction and discharge valve mounting hole, a check valve mounting hole, a balance valve mounting hole and a valve block A slipknot mounting hole corresponding to the overflow valve, the suction and discharge valve, the check valve, the balance valve and the slipknot joint. The side wall of the integrated valve block A is also provided with a valve block A pressure sensor mounting hole corresponding to the pressure sensor.

[0007] The upper end surface of the integrated valve block B is respectively provided with electromagnetic ball valve mounting holes, valve block B pressure sensor mounting holes and valve block B slipknot mounting holes corresponding to the electromagnetic ball valve, pressure sensor and slipknot joint; four joints are also connected to the side wall of the integrated valve block B, and joint mounting holes are provided on the side wall of the integrated valve block B corresponding to the joints.

[0008] An industrial control all-in-one computer is arranged on the internal front side of the load-bearing unit, and a driving unit and a detection unit are arranged on the internal rear side, wherein the servo motor is fixedly connected to the left bottom side of the load-bearing unit through a motor bracket, and the motor bracket and the bottom plate of the load-bearing unit are fixed in sequence by hexagonal bolts, spring washers, flat washers and nuts, and an integrated valve block B is arranged above the motor bracket; the oil tank is located at the right bottom side of the load-bearing unit, and an integrated valve block A is arranged above the oil tank.

[0009] The bearing unit is composed of an upper bearing platform, a lower bottom plate and a middle cabinet, wherein a display screen of an industrial control all-in-one machine is arranged on the upper bearing platform, and handrails are respectively connected to both sides of the upper bearing platform, and universal brake wheels and fixed wheels are respectively connected to both sides of the bottom surface of the lower bottom plate, and an oil collecting pan is arranged between the bottom of the middle cabinet and the lower bottom plate, and a plurality of oil drain ports are arranged on the oil collecting pan, and the oil drain ports are closed with rubber plugs.

[0010] A three-color alarm light, a power-on button, a power-off button and an emergency stop button which are communicatively connected to the electrical control element are also arranged on the upper bearing platform located on one side of the display screen of the industrial control all-in-one machine.

[0011] A cooling fan, an isolating switch and a connector are also arranged on the left side wall of the bearing unit located on one side of the industrial control all-in-one machine.

[0012] The beneficial effects of the present invention are: 1) The system of the present invention adds detection of the displacement of the oil cylinder to be measured. By controlling the servo motor to intermittently replenish oil to the oil cylinder through displacement detection, it is possible to correct the cylinder pressure change caused by internal leakage of the oil cylinder that has been parked for a long time.

[0013] 2) The system of the present invention is highly integrated. The oil pump is built into the oil tank, and a micro air pump is introduced to ensure smooth oil suction by continuously inputting pressure into the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure assembly of the inspection system of the present invention; Figure 2 for Figure 1 Left view of Figure 3 for Figure 1 Rear view of Figure 4 for Figure 2 A schematic diagram of the three-dimensional structure of the driving unit and the detection unit; Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the integrated valve block A; Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the integrated valve block B; Figure 7 This is a driving principle diagram of the inspection system of the present invention.

[0015] In the figure, 1-carrying unit, 2-industrial control integrated machine, 3-three-color alarm light, 4-power-on button, 5-power-off button, 6-emergency stop button, 7-universal brake wheel, 8-fixed wheel, 9-connector, 10-isolating switch, 11-cooling fan, 12-integrated valve block A, 12-1 relief valve installation hole, 12-2 suction and exhaust valve installation hole, 12-3 check valve installation hole, 12-4 balance valve installation hole, 12-5 valve block A slipknot joint installation hole, 12-6 valve block A pressure sensor installation hole; 13-integrated valve block B, 13-1 solenoid ball valve mounting hole, 13-2 valve block B pressure sensor mounting hole, 13-3 valve block B slipknot mounting hole, 13-4 connector mounting hole; 14-servo motor, 15-motor bracket, 16-coupling, 17-oil tank, 18-overflow valve, 19-suction and exhaust valve, 20-check valve, 21-balancing valve, 22-oil pipeline, 23-turbine flowmeter, 24-solenoid ball valve, 25-pressure sensor, 26-slipknot, 27-connector. DETAILED DESCRIPTION

[0016] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0017] Example: Figure 1 and Figure 2 As shown, the present invention provides a hydraulic cylinder module inspection system, including a driving unit, a detection unit and an electrical control unit installed on a carrying unit 1, the electrical control unit includes an industrial control all-in-one machine 2 with a control program and a display screen, wherein electrical control components and power distribution equipment of the industrial control all-in-one machine 2 are installed on one side inside the carrying unit 1, a display screen of the industrial control all-in-one machine 2 communicatively connected to the electrical control components is installed on one side of the upper part of the carrying unit 1, and a driving unit and a detection unit are installed on the other side inside the carrying unit 1.

[0018] A three-color alarm light 3, a power-on button 4, a power-off button 5 and an emergency stop button 6 which are communicated with the electrical control elements are also installed on the upper bearing platform located on the display screen side of the industrial control all-in-one machine 2; a cooling fan 11, an isolating switch 10 and a connector 9 are also installed on the left side wall of the bearing unit 1 located on the side of the industrial control all-in-one machine 2.

[0019] The carrying unit 1 is composed of an upper carrying platform, a lower base plate and a middle cabinet, wherein a display screen of an industrial control all-in-one machine 2 is installed on the upper carrying platform, and handrails are respectively connected on both sides of the upper carrying platform, and universal brake wheels 7 and fixed wheels 8 are respectively connected on both sides of the bottom surface of the lower base plate; the carrying unit 1 is used for carrying and portable movement of the system. Considering the safety factors during the movement of the equipment, the carrying unit 1 is installed with two handrails to facilitate two operators to move the equipment at the same time to ensure the operators' control over the equipment.

[0020] In order to collect leaked oil during operation, an oil collecting pan is arranged between the bottom of the middle cabinet and the lower base plate. The oil collecting pan is provided with multiple oil drain ports, which are closed with rubber plugs to collect oil and reduce the impact of oil on the environment of the operating area.

[0021] like Figure 3 and Figure 4 As shown, the drive unit includes a servo motor 14 and a servo driver. The servo motor 14 is connected to a bidirectional hydraulic pump through a coupling 16, and drives the oil cylinder to be tested through the bidirectional hydraulic pump. A displacement sensor is installed on the oil cylinder to be tested, and the displacement sensor adopts a magnetostrictive sensor to achieve the purpose of measuring displacement; the industrial control integrated machine 2 is installed on the front side of the inner part of the load-bearing unit 1, and the drive unit and the detection unit are installed on the rear side of the inner part, wherein the servo motor 14 is fixedly connected to the left bottom of the load-bearing unit 1 through a motor bracket 15, and the motor bracket 15 and the bottom plate of the load-bearing unit 1 are fixed by hexagonal bolts, spring washers, flat washers and nuts in sequence.

[0022] The detection unit includes an integrated valve block A12, an oil pipeline 22 and an integrated valve block B13 which are sequentially connected to the bidirectional hydraulic pump through an oil circuit, wherein the integrated valve block A12 is respectively installed with a relief valve 18, a suction and discharge valve 19, a one-way valve 20, a balance valve 21 and a pressure sensor 25 in pairs, and the integrated valve block B13 is respectively installed with four electromagnetic ball valves 24 and four pressure sensors 25. The integrated valve blocks A12 and B13 are both connected with an oil pipeline 22 which connects the two through a slipknot joint 26, and a turbine flowmeter 23 is installed on the oil pipeline 22.

[0023] An oil tank 17 is installed at the lower part of the integrated valve block A 12, and the oil tank 17 is located at the right bottom of the load-bearing unit 1. The integrated valve block B 13 is installed above the motor bracket 15; the oil tank 17 is connected to the bidirectional hydraulic pump and the integrated valve block A 12 through oil circuits, and a micro pump group is also connected to the oil tank 17.

[0024] like Figure 5 As shown, the upper end surface of the integrated valve block A 12 is respectively provided with an overflow valve mounting hole 12-1, an intake and exhaust valve mounting hole 12-2, a check valve mounting hole 12-3, a balance valve mounting hole 12-4 and a valve block A slipknot mounting hole 12-5 corresponding to the overflow valve 18, the suction and exhaust valve 19, the check valve 20, the balance valve 21 and the slipknot joint 26, and the side wall of the integrated valve block A 12 is also provided with a valve block A pressure sensor mounting hole 12-6 corresponding to the pressure sensor 25.

[0025] like Figure 6 As shown, the upper end surface of the integrated valve block B 13 is provided with an electromagnetic ball valve mounting hole 13-1, a valve block B pressure sensor mounting hole 13-2 and a valve block B slipknot mounting hole 13-3 corresponding to the electromagnetic ball valve 24, the pressure sensor 25 and the slipknot joint 26 respectively; four joints 27 are also connected to the side wall of the integrated valve block B 13, and a joint mounting hole 13-4 is provided on the side wall of the integrated valve block B 13 corresponding to the joint 27.

[0026] like Figure 7 As shown, the serial numbers in the schematic diagram are represented as follows: 1.1 oil tank, 2.1 liquid level gauge, 3.1 air filter (oil tank cover), 4.1 servo motor, 5.1 servo motor driver, 6.1 coupling, 7.1 bidirectional hydraulic pump, 8.1 suction and discharge valve, 9.1~9.2 plug-in one-way valve, 10.1~10.2 overflow valve, 11.1~11.2 balancing valve, online metering interface, pressure sensor, turbine flowmeter, electromagnetic ball valve, micro air pump group.

[0027] The working process is as follows: the servo motor 4.1, the coupling 6.1 and the bidirectional hydraulic pump 7.1 constitute a power source for conveying and pressing the oil, and the servo driver 5.1 can control the direction and speed of the servo motor 4.1, thereby realizing the switching of the oil direction and the adjustment of the oil flow.

[0028] After the oil is pumped out by the oil pump, the outlet pressure is regulated by the overflow valve 10; the balance valve 11 is used as a back pressure valve to achieve the system's overload. When the cylinder retracts, the load weight can be balanced; the pressure sensor 13 is used to measure the outlet oil pressure in real time (13.1 and 13.2 are used to measure the system outlet pressure, and 13.3~13.6 are used to measure the cylinder pressure holding pressure); the flow meter 14 is used to monitor the outlet flow.

[0029] At the end of the system, the oil is divided into two paths, which are used to supply oil to the telescopic cylinder and the locking cylinder respectively. Each oil path is controlled by a separate electromagnetic ball valve 15 to realize the on / off control of the oil path, thereby realizing independent or coordinated control of the telescopic cylinder and the locking cylinder.

[0030] The oil at the outlet end of the oil cylinder returns to the oil pump via the electromagnetic ball valve 15, the flow meter 14, the pressure sensor 13, the balance valve 11 and the suction and discharge valve 8 in sequence, thus forming a circulation.

[0031] Considering that the telescopic cylinder and the locking cylinder are two-chamber asymmetric cylinders, the system achieves oil balance in the system through the hydraulically controlled suction and discharge valve 8.1.

[0032] In order to realize the integrated design of the equipment, the oil pump is built into the oil tank. Therefore, this system introduces a micro air pump to ensure smooth oil suction by continuously inputting pressure into the oil tank.

[0033] In order to realize the daily calibration of the system, the system has reserved the pressure sensor online calibration interface (12.1) and the flow meter online calibration interface (12.2, 12.3). In the daily state, the plug is used for sealing. During the calibration, you only need to remove the plug and install the standard meter to realize the online measurement and calibration of the flow meter and pressure sensor.

[0034] How the system works: The hydraulic module inspection system is a movable device. The carrying unit 1 is used to move the device to the oil cylinder inspection area, and the power supply, hydraulic pipeline, and detection equipment are connected in sequence to inspect the oil cylinder to be tested.

[0035] The hydraulic module inspection system (mechanical hydraulic part) is driven by an electro-hydraulic direct-drive actuator. The basic principle of the electro-hydraulic direct-drive actuator is to drive a bidirectional hydraulic pump through a servo motor, and the bidirectional hydraulic pump directly drives the hydraulic cylinder to extend and retract, thereby realizing the opening / closing, loosening / tightening, unlocking / locking of the hydraulic module.

[0036] The hydraulic module inspection system controls the forward / reverse rotation and speed of the servo motor through the electronic control system and software to control the movement direction and speed of the cylinder; a displacement sensor for detecting the position is set on the cylinder to be tested, and the servo motor speed is adjusted through real-time displacement to control the actual position of the cylinder in a closed loop, thereby achieving positioning requirements at any position.

[0037] The electro-hydraulic direct drive power source is equipped with a sensor for detecting the pressure of the two chambers of the oil cylinder, which can monitor the pressure of the two chambers of the oil cylinder in real time; the electro-hydraulic direct drive power source is equipped with a balance valve for the two chambers of the oil cylinder, which can realize overload control; a flow meter is installed on the control oil port, which can monitor the flow output of the hydraulic pump in real time. Pressure sensors and flow sensors are installed on each oil supply pipeline to measure the medium pressure and flow on each oil supply pipeline in real time, and realize the measurement of the unlocking pressure of the locking oil cylinder; a balance valve for the two chambers of the oil cylinder is installed on the drive device, which can realize overload control.

[0038] After the cylinder reaches the specified position, the balance valve maintains the current position and the servo motor stops. At the same time, the displacement sensor monitors the actual position of the cylinder in real time. If it stops for a long time and the cylinder position exceeds the control value due to internal leakage, the servo motor will be started intermittently to automatically adjust the cylinder to the set position.

[0039] In addition, the locking force after the cylinder is in place is first maintained by the balance valve. When the locking force of the cylinder decreases due to internal leakage, the servo motor is started intermittently to replenish oil to the cylinder, so as to always keep the locking force within the control range.

[0040] The system of the present invention adds detection of the displacement of the oil cylinder to be tested, and controls the servo motor to intermittently replenish oil to the oil cylinder through displacement detection, so as to correct the cylinder pressure change caused by internal leakage of the oil cylinder that has been parked for a long time.

[0041] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A hydraulic cylinder module inspection system, characterized in that: The invention comprises a driving unit, a detection unit and an electrical control unit arranged on a carrying unit (1), wherein the electrical control unit comprises an industrial control all-in-one machine (2) with a control program and a display screen, wherein electrical control elements and power distribution equipment of the industrial control all-in-one machine (2) are arranged on one side inside the carrying unit (1), a display screen of the industrial control all-in-one machine (2) in communication connection with the electrical control elements is arranged on one side of the upper part of the carrying unit (1), and the driving unit and the detection unit are arranged on the other side inside the carrying unit (1); The drive unit comprises a servo motor (14) and a servo driver, the servo motor (14) being connected to a bidirectional hydraulic pump via a coupling (16), and driving the oil cylinder to be tested via the bidirectional hydraulic pump, wherein a displacement sensor is provided on the oil cylinder to be tested; The detection unit comprises an integrated valve block A (12), an oil pipeline (22) and an integrated valve block B (13) which are sequentially connected to the bidirectional hydraulic pump via an oil circuit, wherein the integrated valve block A (12) is provided with a relief valve (18), a suction and discharge valve (19), a check valve (20), a balance valve (21) and a pressure sensor (25) in pairs, respectively, and the integrated valve block B (13) is provided with four electromagnetic ball valves (24) and four pressure sensors (25) respectively. The integrated valve block A (12) and the integrated valve block B (13) are both connected to an oil pipeline (22) which is connected to the two via a slipknot joint (26), and a turbine flowmeter (23) is provided on the oil pipeline (22); An oil tank (17) is provided at the lower part of the integrated valve block A (12); the oil tank (17) is respectively connected to the bidirectional hydraulic pump and the integrated valve block A (12) through oil circuits; a micro pump group is also provided on the oil tank (17).

2. A hydraulic cylinder module inspection system according to claim 1, characterized in that: The upper end surface of the integrated valve block A (12) is provided with a relief valve mounting hole (12-1), a suction and discharge valve mounting hole (12-2), a check valve mounting hole (12-3), a balance valve mounting hole (12-4) and a valve block A slipknot mounting hole (12-5) corresponding to the relief valve (18), the suction and discharge valve (19), the check valve (20), the balance valve (21) and the slipknot joint (26), respectively. The side wall of the integrated valve block A (12) is also provided with a valve block A pressure sensor mounting hole (12-6) corresponding to the pressure sensor (25).

3. A hydraulic cylinder module inspection system according to claim 1, characterized in that: The upper end surface of the integrated valve block B (13) is provided with an electromagnetic ball valve mounting hole (13-1), a valve block B pressure sensor mounting hole (13-2) and a valve block B slipknot mounting hole (13-3) corresponding to the electromagnetic ball valve (24), the pressure sensor (25) and the slipknot connector (26), respectively; four connectors (27) are also connected to the side wall of the integrated valve block B (13); and connector mounting holes (13-4) are provided on the side wall of the integrated valve block B (13) corresponding to the connectors (27).

4. A hydraulic cylinder module inspection system according to claim 1, characterized in that: An industrial control integrated machine (2) is arranged on the front side of the interior of the carrying unit (1), and a drive unit and a detection unit are arranged on the rear side of the interior, wherein a servo motor (14) is fixedly connected to the left bottom of the carrying unit (1) via a motor bracket (15), the motor bracket (15) and the bottom plate of the carrying unit (1) are fixed in sequence via hexagonal bolts, spring washers, flat washers and nuts, and an integrated valve block B (13) is arranged above the motor bracket (15); an oil tank (17) is located at the right bottom of the carrying unit (1), and an integrated valve block A (12) is arranged above the oil tank (17).

5. A hydraulic cylinder module inspection system according to claim 1 or 4, characterized in that: The bearing unit (1) is composed of an upper bearing platform, a lower bottom plate and a middle cabinet, wherein a display screen of an industrial control integrated machine (2) is arranged on the upper bearing platform, and handrails are respectively connected to both sides of the upper bearing platform, and universal brake wheels (7) and fixed wheels (8) are respectively connected to both sides of the bottom surface of the lower bottom plate, and an oil collecting pan is arranged between the bottom of the middle cabinet and the lower bottom plate, and a plurality of oil drain ports are arranged on the oil collecting pan, and the oil drain ports are closed with rubber plugs.

6. A hydraulic cylinder module inspection system according to claim 1, characterized in that: A three-color alarm light (3), a power-on button (4), a power-off button (5), and an emergency stop button (6) which are communicatively connected to the electrical control element are also provided on the upper bearing platform located on one side of the display screen of the industrial control all-in-one machine (2).

7. The hydraulic cylinder module inspection system according to claim 1, characterized in that: A cooling fan (11), an isolating switch (10) and a connector (9) are also provided on the left side wall of the carrying unit (1) located on one side of the industrial control all-in-one machine (2).

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