A hydraulic proportional valve testing device

Abstract

The utility model provides a kind of hydraulic proportional valve detection device, it is related to hydraulic system detection technical field, comprising: electric control system, with hydraulic system connection, for controlling hydraulic system operation;Signal feedback system, for collecting proportional valve PDA curve in hydraulic system, when the value on PDA curve exceeds set threshold value, proportional valve is in abnormal state.The utility model is online collection and threshold discrimination to the PDA curve of proportional valve, can monitor whether the working state of proportional valve appears abnormality at any time, shorten fault positioning time, reduce downtime loss.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system testing technology, and in particular to a hydraulic proportional valve testing device. Background Technology

[0002] Hydraulic systems are widely used in metallurgical steel rolling mills. The proportional valves in these systems, as core actuators and regulators, handle closed-loop control of pressure, flow, and position; their dynamic performance and reliability directly determine the quality of the processed products.

[0003] The current fault diagnosis of proportional valves mainly relies on the experience and judgment of the staff, which is very easy to misdiagnose. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model embodiment is to provide a hydraulic proportional valve detection device.

[0005] A hydraulic proportional valve testing device, comprising:

[0006] The electronic control system is connected to the hydraulic system and is used to control the operation of the hydraulic system.

[0007] The signal feedback system is used to collect the PDA curve of the proportional valve in the hydraulic system. When the value on the PDA curve exceeds the set threshold, the proportional valve is in an abnormal state.

[0008] Preferably, the electrical control system includes a main power switch 15, a hydraulic motor power switch 16, a hydraulic motor contactor 17, and a hydraulic pump motor 18; one end of the main power switch 15 is connected to the power input terminal, the other end of the main power switch 15 is connected to one end of the hydraulic motor power switch 16, the other end of the hydraulic motor power switch 16 is connected to one end of the hydraulic motor contactor 17, and the other end of the hydraulic motor contactor 17 is connected to the hydraulic pump motor 18.

[0009] Preferably, the main power switch 15 is also connected to the PLC power module 24; the PLC power module 24 is used to supply power to the signal feedback system.

[0010] The signal feedback system is connected to the proportional valve switch module and the directional valve switch module respectively, and is used to control the working state of the proportional valve switch module and the directional valve switch module so that the hydraulic cylinder 9 of the hydraulic system moves to the drive side / operation side.

[0011] Preferably, the proportional valve switching module includes a proportional valve coil 28 and an AI module 27, wherein the proportional valve coil 28 is connected to the signal feedback system through the AI ​​module 27.

[0012] Preferably, the reversing valve switching module includes a reversing valve coil 29 and a DO module 26, wherein the reversing valve coil 29 is connected to the signal feedback system through the DO module 26.

[0013] Preferably, the proportional valve coil 28 includes coil a and coil b. When coil a is energized and the directional valve coil 29 is energized, the hydraulic cylinder 9 moves toward the operating side.

[0014] Preferably, when coil b is energized and directional valve coil 29 is energized, hydraulic cylinder 9 moves toward the drive side.

[0015] Preferably, it further includes:

[0016] DC power supply 20 is connected to the main power switch 15 via power switch 22; DC power supply 20 is used to power DO module 26 and AI module 27.

[0017] According to the specific embodiments provided by this utility model, the following technical effects are disclosed:

[0018] This utility model relates to a hydraulic proportional valve detection device. Compared with the prior art, this utility model can monitor the working status of the proportional valve at all times by online acquisition and threshold discrimination of the PDA curve of the proportional valve, shortening the fault location time and reducing downtime losses.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a hydraulic proportional valve detection device provided in this utility model.

[0022] Figure 2 This is a schematic diagram of the electronic control system provided in this utility model;

[0023] Figure 3 This is a schematic diagram of the hydraulic system provided in this utility model;

[0024] Figure 4 The PDA curve of the proportional valve under normal operating conditions provided in this utility model;

[0025] Figure 5 This is a PDA curve showing the fault state of the proportional valve provided in this utility model.

[0026] Symbol explanation:

[0027] 1. Oil tank, 2. Hydraulic pump, 3. Relief valve, 4. Proportional valve, 5. Directional valve, 6. Pressure gauge, 7. Check valve, 8. Relief valve, 9. Hydraulic cylinder, 10. Filter, 11. Drain pipe Y, 12. Return pipe T, 13. Inlet pipe P, 14. 380V power supply, 15. Main power switch Q1, 16. Hydraulic motor power switch Q2, 17. Hydraulic motor contactor KM, 18. Hydraulic pump motor, 19. KM coil, 20. DC power supply, 21. Closing / opening switch Q3, 22. Power switch, 23. PLC power switch Q5, 24. PLC power module, 25. DI module, 26. DO module, 27. AI module, 28. Proportional valve coil, 29. Directional valve coil, 30. Operating side QS1, 31. Drive side QS2. Detailed Implementation

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figure 1 As shown, this embodiment provides a hydraulic proportional valve detection device, including:

[0032] The electronic control system is connected to the hydraulic system and is used to control the operation of the hydraulic system.

[0033] The signal feedback system is used to collect the PDA curve of the proportional valve in the hydraulic system. When the value on the PDA curve exceeds the set threshold, the proportional valve is in an abnormal state.

[0034] For further details, please refer to Figure 2 The electrical control system includes a main power switch 15, a hydraulic motor power switch 16, a hydraulic motor contactor 17, and a hydraulic pump motor 18. One end of the main power switch 15 is connected to the power input terminal, the other end of the main power switch 15 is connected to one end of the hydraulic motor power switch 16, the other end of the hydraulic motor power switch 16 is connected to one end of the hydraulic motor contactor 17, and the other end of the hydraulic motor contactor 17 is connected to the hydraulic pump motor 18.

[0035] The main power switch 15 is also connected to the PLC power module 24; the PLC power module 24 is used to supply power to the signal feedback system.

[0036] The signal feedback system is connected to the proportional valve switch module and the directional valve switch module respectively, and is used to control the working state of the proportional valve switch module and the directional valve switch module so that the hydraulic cylinder 9 of the hydraulic system moves to the drive side / operation side.

[0037] Furthermore, the proportional valve switching module includes a proportional valve coil 28 and an AI module 27, wherein the proportional valve coil 28 is connected to the signal feedback system via the AI ​​module 27. The directional valve switching module includes a directional valve coil 29 and a DO module 26, wherein the directional valve coil 29 is connected to the signal feedback system via the DO module 26.

[0038] The proportional valve coil 28 includes coil a and coil b. When coil a is energized, the directional valve coil 29 is energized, and the hydraulic cylinder 9 moves towards the operating side. When coil b is energized, the directional valve coil 29 is energized, and the hydraulic cylinder 9 moves towards the driving side.

[0039] The working process of this utility model is as follows:

[0040] After the 380V power supply is supplied, turn on the main power switch Q1 (15) and the hydraulic motor power switch Q2 (16). Press the closing / opening switch Q3 (21). The KM coil (19) is energized, the hydraulic motor contactor KM (17) is engaged, and the hydraulic pump motor (18) starts running, bringing the hydraulic system to the working pressure.

[0041] When PLC power switch Q5 is closed (23), PLC power module 24 is powered on (24V), power switch Q4 (22) is closed (20), DC power is powered on (20), and outputs 24V to power modules 25DI, 26DO, and 27AI.

[0042] Pressing button QS1 on the operating side (30) energizes coils 28 (proportional valve a) and 29 (directional valve), causing the hydraulic cylinder to move towards the operating side.

[0043] Press button 31 (QS2 on the drive side), energize coil 28 (proportional valve b) and coil 29 (directional valve), and the hydraulic cylinder moves towards the drive side.

[0044] The signal feedback system is used to convert the opening angle of the proportional valve into a current signal, which is then displayed on a PDA.

[0045] The DI module, model 6ES7321-1BH02-0AA0, is used to receive control signals from the QS1 and QS2 buttons. The DO module, model 6ES7322-1BF01-0AA0, is used to drive the 29 directional valve. The AI ​​module, model 6ES7331-7KB01-0AB0, is used to convert the feedback signal into a current signal for PDA monitoring.

[0046] Please see Figure 3 The working principle of this utility model is further explained in conjunction with the hydraulic system:

[0047] Install the proportional valve 4, which needs to be tested, on the hydraulic system oil circuit. The hydraulic oil flows from tank 1 through hydraulic pump 2 and then through relief valve 3 to adjust the pressure. The pressure value is displayed by pressure gauge 6. The hydraulic oil continues to enter proportional valve 4 through inlet pipe P 13.

[0048] (1) When the proportional valve a is energized, the directional valve 5 is energized, and the check valve 7 is in the open state through hydraulic oil. The oil enters the rod chamber side of the hydraulic cylinder 9 through port P of the proportional valve 4 and port B. The hydraulic cylinder 9 moves to the operating side. The oil in the rodless chamber of the hydraulic cylinder 9 flows through port A of the proportional valve 4 through port T of the check valve 7 and flows into the return oil pipe T of 12. After passing through the filter of 10, it finally returns to the oil tank of 1.

[0049] (2) When proportional valve b is energized, directional valve 5 is energized, and check valve 7 is in the open state through hydraulic oil. The oil enters the rodless chamber side of hydraulic cylinder 9 through port P of proportional valve 4 and port A. Hydraulic cylinder 9 moves towards the drive side (when the hydraulic oil pressure is too high, it flows through overflow valve 8, through return oil pipe T of 12, through filter 10, and finally returns to oil tank 1). The oil in the rod chamber of hydraulic cylinder 9 flows through check valve 7, through port B of proportional valve 4, through port T, into return oil pipe T of 12, through filter 10, and finally returns to oil tank 1.

[0050] proportional valve test results are as follows Figure 4-5As shown, it is clear that when the proportional valve is operating normally, the input signal and the valve core position feedback curve are basically consistent and coincident. However, when the proportional valve is in a faulty state, the input signal and the valve core position feedback curve do not coincide.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A hydraulic proportional valve testing device, characterized in that, include: The electronic control system is connected to the hydraulic system and is used to control the operation of the hydraulic system. The signal feedback system is used to collect the PDA curve of the proportional valve in the hydraulic system. When the value on the PDA curve exceeds the set threshold, the proportional valve is in an abnormal state.

2. The hydraulic proportional valve testing device according to claim 1, characterized in that, The electrical control system includes a main power switch (15), a hydraulic motor power switch (16), a hydraulic motor contactor (17), and a hydraulic pump motor (18); one end of the main power switch (15) is connected to the power input terminal, the other end of the main power switch (15) is connected to one end of the hydraulic motor power switch (16), the other end of the hydraulic motor power switch (16) is connected to one end of the hydraulic motor contactor (17), and the other end of the hydraulic motor contactor (17) is connected to the hydraulic pump motor (18).

3. The hydraulic proportional valve testing device according to claim 2, characterized in that, Also includes: The main power switch (15) is also connected to the PLC power module (24); the PLC power module (24) is used to supply power to the signal feedback system; The signal feedback system is connected to the proportional valve switch module and the directional valve switch module respectively, and is used to control the working state of the proportional valve switch module and the directional valve switch module so that the hydraulic cylinder (9) of the hydraulic system moves to the drive side / operation side.

4. The hydraulic proportional valve testing device according to claim 3, characterized in that, The proportional valve switching module includes a proportional valve coil (28) and an AI module (27), wherein the proportional valve coil (28) is connected to the signal feedback system through the AI ​​module (27).

5. A hydraulic proportional valve testing device according to claim 4, characterized in that, The reversing valve switching module includes a reversing valve coil (29) and a DO module (26), wherein the reversing valve coil (29) is connected to the signal feedback system through the DO module (26).

6. The hydraulic proportional valve testing device according to claim 5, characterized in that, The proportional valve coil (28) includes coil a and coil b. When coil a is energized and the directional valve coil (29) is energized, the hydraulic cylinder (9) moves toward the operating side.

7. A hydraulic proportional valve testing device according to claim 6, characterized in that, When coil b is energized, and directional valve coil (29) is energized, hydraulic cylinder (9) moves toward the drive side.

8. A hydraulic proportional valve testing device according to claim 7, characterized in that, Also includes: A DC power supply (20) is connected to the main power switch (15) via a power switch (22); the DC power supply (20) is used to power the DO module (26) and the AI ​​module (27).

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