Motor-driven water-based proportional directional valve and control method thereof

Abstract

The invention relates to the technical field of hydraulic control, and provides a motor-driven water-based proportional directional valve and a control method thereof. The pilot valve comprises a pilot valve ejector rod and a pilot valve element, the motor is connected with the pilot valve ejector rod, and the pilot valve element comprises a pilot valve working port; the main valve core is respectively connected with the pilot valve working port and the controlled load; and the proportional valve controller is connected with the motor, and the proportional valve controller is used for controlling the motor to work, driving the pilot valve ejector rod to stretch out and draw back, and controlling the opening degree of the pilot valve working port, so that the main valve element is driven to move, and the work of the controlled load is controlled. Accurate and convenient control of the controlled load can be achieved through the linear motor, and the response speed of the reversing valve is increased.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic control technology, and in particular to a motor-driven water-based proportional reversing valve and a control method thereof. Background Art

[0002] At present, the switch-type proportional reversing valve is used in coal mining to control the action of the hydraulic support. The switch-type proportional reversing valve has only two working states: "fully open" and "fully closed", that is, the hydraulic support can only move at a constant speed, which is difficult to meet the precise control of the hydraulic support posture and the precise pushing and sliding of the hydraulic support, and it is impossible to achieve the soft start of the hydraulic cylinder, which affects the service life of the hydraulic cylinder, causes the quality of the working face support to decline, affects the straightness of the scraper conveyor, and reduces the service life of the scraper conveyor. In addition, the existing proportional reversing valve has a complex structure and slow response speed, resulting in poor control accuracy. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a motor-driven water-based proportional reversing valve and a control method thereof, so as to at least solve the technical problem in the prior art that the proportional reversing valve has poor control accuracy and affects the operation of controlled loads such as hydraulic cylinders.

[0004] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0005] The present disclosure provides a motor-driven water-based proportional reversing valve, comprising:

[0006] Motor;

[0007] A pilot valve, comprising a pilot valve push rod and a pilot valve core, the motor is connected to the pilot valve push rod, and the pilot valve core comprises a pilot valve working port;

[0008] A main valve core is connected to the working port of the pilot valve and the controlled load respectively;

[0009] A proportional valve controller is connected to the motor, and is used to control the operation of the motor, drive the pilot valve push rod to extend and retract, and control the opening of the pilot valve working port, thereby driving the main valve core to move and controlling the operation of the controlled load.

[0010] In some embodiments, an amplification lever is further connected between the motor and the pilot valve push rod.

[0011] In some embodiments, the motor includes a first motor and a second motor, the pilot valve includes a first pilot valve and a second pilot valve, the first pilot valve is arranged on a first side of the amplification lever, and the second pilot valve is arranged on a second side of the amplification lever.

[0012] The first motor acts on the first end of the amplifying lever to drive the first pilot valve push rod of the first pilot valve to extend and retract; the second motor acts on the second end of the amplifying lever to drive the second pilot valve push rod of the second pilot valve to extend and retract.

[0013] In some embodiments, the motor-driven water-based proportional reversing valve further includes a first displacement sensor connected to the motor, a flow sensor connected to the main valve core, and a second displacement sensor connected to the controlled load.

[0014] In some embodiments, the motor-driven water-based proportional reversing valve is a load-sensitive water-based proportional reversing valve.

[0015] In some embodiments, the motor is an intrinsically safe linear motor.

[0016] In some embodiments, a digital pulse signal generator connected between the proportional valve controller and the motor is also included.

[0017] The present disclosure provides a control method for a motor-driven water-based proportional directional control valve, which is applied to the motor-driven water-based proportional directional control valve. The method includes:

[0018] The proportional valve controller obtains first displacement information of the motor, flow information of the main valve core and second displacement information of the controlled load;

[0019] The proportional valve controller adjusts the action parameters of the controlled load according to the first displacement information, the second displacement information and the second displacement information.

[0020] In some embodiments, the motion parameters include the movement direction and movement speed of the controlled load.

[0021] In some embodiments, the method further comprises:

[0022] The proportional valve controller adjusts the pressure output by the main valve core to the controlled load by adjusting the flow rate of the pilot valve working port.

[0023] In a second aspect, the present disclosure provides a control method for a valve core follower type water-based proportional reversing valve.

[0024] The disclosed embodiment provides a motor-driven water-based proportional reversing valve and a control method thereof. A motor, a pilot valve, a main valve core and a proportional valve controller are provided. The pilot valve includes a pilot valve push rod and a pilot valve core. The motor is connected to the pilot valve push rod. The pilot valve core includes a pilot valve working port. The main valve core is respectively connected to the pilot valve working port and a controlled load. The proportional valve controller is connected to the motor. The proportional valve controller drives the motor to work and can drive the pilot valve push rod to extend and retract, and control the opening of the pilot valve working port, thereby driving the main valve core to move and driving the hydraulic actuator to move. The linear motor can be used to achieve accurate and convenient control of the controlled load and improve the response speed of the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a structural schematic diagram of a motor-driven water-based proportional reversing valve according to an embodiment of the present disclosure;

[0027] Figure 2 It is a structural schematic diagram of a main valve (including a main valve core, a main valve body and a valve seat) of a motor-driven water-based proportional reversing valve according to an embodiment of the present disclosure;

[0028] Figure 3 This is a control schematic diagram of the motor-driven water-based proportional reversing valve according to an embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 1-motor, 11-first motor, 12-second motor; 2-pilot valve, 21-pilot valve push rod, 22-pilot valve core, 221-pilot valve working port, 222-pilot valve liquid inlet, 223-pilot valve return liquid port, 201-first pilot valve, 202-second pilot valve; 3-main valve core, 31-main valve core core hole, 32-second interface, 33-first flow channel, 34-second flow channel; 4-proportional valve controller; 5-amplification lever; 6-main valve body, 61-liquid inlet, 62-return liquid port, 63-first interface, 64-control chamber; 7-valve seat; 8-digital pulse signal generator. DETAILED DESCRIPTION

[0031] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0032] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0033] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0034] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0035] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0036] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0037] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0038] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0039] Embodiment 1

[0040] Figures 1 to 3 FIG. 2 shows a schematic diagram of the structure of a motor-driven water-based proportional reversing valve according to an embodiment of the present disclosure. Figures 1 to 3 As shown, an embodiment of the present disclosure provides a motor-driven water-based proportional reversing valve, comprising:

[0041] Motor 1;

[0042] The pilot valve 2 includes a pilot valve push rod 21 and a pilot valve core 22. The motor 1 is connected to the pilot valve push rod 21. The pilot valve core 22 includes a pilot valve working port 221.

[0043] The main valve core 3 is connected to the pilot valve working port 221 and the controlled load respectively;

[0044] The proportional valve controller 4 is connected to the motor 1 and is used to control the operation of the motor 1, drive the pilot valve push rod 21 to extend and retract, control the opening of the pilot valve working port 221, thereby driving the main valve core 3 to move and control the operation of the controlled load.

[0045] The controlled load can be a hydraulic actuator. The motor-driven water-based proportional reversing valve provided in the embodiment of the present disclosure includes a motor 1, a pilot valve 2, a main valve core 3 and a proportional valve controller 4, the pilot valve 2 includes a pilot valve push rod 21 and a pilot valve core 22, the motor 1 is connected to the pilot valve push rod 21, the pilot valve core 22 includes a pilot valve working port 221, the main valve core 3 is respectively connected to the pilot valve working port 221 and the controlled load, the proportional valve controller 4 is connected to the motor 1, the proportional valve controller 4 drives the motor 1 to work, can drive the pilot valve push rod 21 to extend and retract, and control the opening of the pilot valve working port 221, thereby driving the main valve core 3 to move, driving the hydraulic actuator to move, using the linear motor to achieve accurate and convenient control of the controlled load, and improving the response speed of the reversing valve.

[0046] In some embodiments, Figure 1 As shown, an amplifying lever 5 is also connected between the motor 1 and the pilot valve push rod 21. By applying a small current to the motor 1, a large thrust can be applied to the pilot valve push rod 21 through the amplifying lever 5, thereby driving the pilot valve 2 to work.

[0047] In some embodiments, the motor includes a first motor 11 and a second motor 12, the pilot valve includes a first pilot valve 201 and a second pilot valve 202, the first pilot valve 201 is arranged on a first side of the amplification lever 5, and the second pilot valve 202 is arranged on a second side of the amplification lever 5,

[0048] The first motor 11 acts on the first end of the amplifying lever 5 to drive the first pilot valve push rod of the first pilot valve 201 to extend and retract; the second motor 12 acts on the second end of the amplifying lever 5 to drive the second pilot valve push rod of the second pilot valve 202 to extend and retract.

[0049] The two pilot valves correspond to the two main valve cores 3, and the two main valve cores 3 respectively control the two chambers of the same hydraulic actuator (for example, the rod chamber and the rodless chamber of the hydraulic cylinder). In this embodiment, the two pilot valves 2 are amplified and controlled by the same amplification lever 5, the control integration is high, and the overall layout is reasonable and compact, which is convenient for layout in a small space.

[0050] In some embodiments, the motor-driven water-based proportional reversing valve further includes a first displacement sensor connected to the motor 1, a flow sensor connected to the main valve core 3, and a second displacement sensor connected to the controlled load. The first displacement sensor, the flow sensor, and the second displacement sensor are also respectively connected to the proportional valve controller 4, and the acquired sensor information is fed back to the proportional valve controller 4, so that during the operation of the hydraulic actuator, the action of the hydraulic actuator can be dynamically adjusted according to the feedback sensor information in real time, thereby improving the control accuracy.

[0051] In some embodiments, the motor-driven water-based proportional reversing valve is a load-sensitive water-based proportional reversing valve, and the motor-driven water-based proportional reversing valve further includes:

[0052] A main valve body 6, the main valve body 6 is provided with a liquid inlet 61, a liquid return port 62, and a first interface 63 connected to the pilot valve working port 221, the main valve core 3 is movably arranged in the main valve body 6, the main valve core 3 is provided with a main valve core hole 31 and a second interface 32 connected to the controlled load, the main valve core hole 31 is respectively connected to the liquid inlet 61 and the second interface 32, and the second interface 32 is also connected to the liquid return port 62;

[0053] A valve seat 7 is movably disposed in the main valve body 6 and is in contact with and connected to the main valve core 3. One end of the valve seat 7 away from the main valve body 6 is connected to the main valve body 6 to form a control chamber 64. The control chamber 64 is in communication with the first interface 63.

[0054] When the pilot valve working port 221 is selectively connected to the pilot valve liquid inlet 222 or the pilot valve liquid return port 223, the working medium in the control chamber 64 can act on the main valve core 3 and the valve seat 7, so that the second interface 32 is selectively connected to the liquid inlet 61 or the liquid return port 62, thereby controlling the operation of the controlled load.

[0055] The second interface 32 is arranged at one axial end of the main valve core 3, the main valve core core hole 31 is opened along the circumference of the main valve core 3, and a first flow channel 33 is arranged in the main valve core 3 to connect the main valve core core hole 31 and the second interface 32. The second interface 32 is also connected to the liquid return port 62 through the first flow channel 33. The working medium can be a liquid such as a water-based medium or hydraulic oil.

[0056] When the pilot valve working port is connected to the pilot valve liquid inlet 222, the high-pressure liquid in the pilot valve enters the control chamber 64 through the first interface 63, and the control chamber 64 is filled with high-pressure liquid. Since the flow cross section of the working medium flowing in from the liquid inlet 61 is small, and the flow cross section of the working medium in the main control chamber 64 is large, the pressure exerted by the working medium on the valve seat 7 toward the left is greater than the pressure exerted by the working medium on the main valve core 3 toward the right, that is, the main valve core 3 and the valve seat 7 are subjected to the left hydraulic pressure of the working medium as a whole. Under the action, the valve seat 7 and the main valve core 3 are pushed to the left, and the valve seat 7 and the main valve core 3 are abutted against each other, closing the return liquid port 62, so that the connection between the first flow channel 33 and the return liquid port 62 is disconnected, and the liquid in the main valve body 6 cannot flow out from the return liquid port 62; at the same time, since the main valve core 3 moves to the left, the contact between the main valve core 3 and the inner wall of the main valve body 6 is disconnected, so that the second flow channel 34 between the two is opened, and the liquid inlet 61 is connected with the main valve core core hole 31, and the high-pressure liquid enters the first flow channel 33 from the liquid inlet 61, and flows out from the second interface 32 to flow to the load.

[0057] When the pilot valve working port is connected to the pilot valve return port 223, the working medium in the control chamber 64 flows to the first interface 63, causing the pressure in the control chamber 64 to drop, and the valve seat 7 and the main valve core 3 move to the right at the same time under the action of the high-pressure liquid pressure on the left side, and the main valve core 3 contacts the inner wall of the main valve body 6 again to form a seal, cutting off the connection between the liquid inlet 61 and the main valve core core hole 31, that is, cutting off the connection between the liquid inlet 61 and the second interface 32; at this time, there is still a certain residual pressure in the first flow channel 33 of the main valve core 3 to continue to push the valve seat 7 to move to the rightmost end, so that the left end face of the valve seat 7 is separated from the right end face of the main valve core 3, connecting the second interface 32 with the return port 62, and the working medium in the load flows to the return port 62, and flows out from the return port 62 to return the system, thereby realizing load-sensitive proportional control.

[0058] In this embodiment, the pressure in the first flow channel 33 connected to the second interface 32 can be adjusted according to the hydraulic pressure in the control chamber 64 to control the controlled load. The greater the hydraulic pressure in the control chamber 64, the greater the hydraulic pressure in the connection chamber of the second interface 32, that is, the greater the load. In this way, load-sensitive proportional control can be achieved. For example, when the load requires pressure to increase, the pilot valve flow increase action can be automatically started to increase the hydraulic pressure in the control chamber 64. Figure 1As shown, the motor-driven water-based proportional reversing valve controls the opening size of the pilot valve working port 221 by pushing the pilot valve push rod 21 through the motor 1, thereby adjusting the high-pressure liquid flow rate output from the pilot valve working port 221. The pilot valve working port 221 is connected to the first interface 63 on the main valve body 6. When the controlled load requires an increase in pressure, the proportional valve controller 4 can adjust the motor 1 so that the high-pressure liquid flow rate output from the pilot valve working port 221 controls the action of the controlled load. The proportional valve controller 4 can automatically control the operation of the motor 1 according to the pressure feedback from the controlled load, or it can be manually input to the proportional valve controller 4 to manually control the operation of the motor 1. The specific control method is not limited in this disclosure.

[0059] Optionally, the motor 1 is an intrinsically safe linear motor. Compared with a proportional electromagnet, a linear motor has a large and balanced output force that does not change with position changes; secondly, it can achieve precise control of the displacement, i.e., the position of the pilot valve. In this embodiment, the motor 1 is set as an intrinsically safe motor for the coal safety structure, which can meet the use requirements of coal mines.

[0060] In some embodiments, a digital pulse signal generator 8 is further included which is connected between the proportional valve controller 4 and the motor 1. The proportional valve controller 4 can accurately drive the motor to move through the digital pulse signal generator 8, thereby driving the pilot valve 2, the main valve core 3 and the controlled load to move in sequence, thereby achieving accurate control of the controlled load.

[0061] Embodiment 2

[0062] The present disclosure provides a control method for a motor-driven water-based proportional directional control valve, which is applied to the motor-driven water-based proportional directional control valve. The method includes:

[0063] S101: the proportional valve controller 4 obtains first displacement information of the motor 1, flow information of the main valve core 2, and second displacement information of the controlled load;

[0064] S102: The proportional valve controller 4 adjusts the action parameters of the controlled load according to the first displacement information, the second displacement information and the second displacement information.

[0065] The action parameters include the movement direction and movement speed of the controlled load. The proportional valve controller 4 can send a control signal to the motor 1 through a digital pulse signal generator, drive the motor 1 to perform telescopic movement, and then drive the pilot valve push rod 21 to move, control the opening of the pilot valve working port 221, control the flow output of the pilot valve working port 221 according to the opening size, drive the main valve core 3 to move, and drive the hydraulic actuator to perform corresponding actions.

[0066] During the operation of the hydraulic actuator, the proportional valve controller 4 can receive in real time the first displacement signal fed back by the motor 1, the flow signal fed back by the main valve core 3, and the second displacement signal (stroke feedback) fed back by the hydraulic actuator. The proportional valve controller 4 further drives the motor to perform telescopic movement and adjusts the flow of the main valve core 3 according to the above-mentioned first displacement signal, second displacement signal and flow signal, thereby dynamically adjusting the movement direction, movement speed, etc. of the hydraulic actuator during the movement of the hydraulic actuator.

[0067] In some embodiments, the method further comprises:

[0068] The proportional valve controller 4 adjusts the pressure output from the main valve core 3 to the controlled load by adjusting the flow rate of the pilot valve working port 221 .

[0069] The motor-driven water-based proportional directional valve of this embodiment can be a load-sensitive directional valve, having a first interface 61 connected to the pilot valve working port 221 and a second interface 32 connected to the hydraulic actuator. The proportional valve controller 4 can adjust the flow of the pilot valve working port 221 according to the pressure required by the hydraulic actuator, thereby adjusting the hydraulic pressure in the control chamber 64, and precisely controlling the hydraulic actuator in proportion.

[0070] The control method of the motor-driven water-based proportional reversing valve provided in the embodiment of the present disclosure corresponds to the motor-driven water-based proportional reversing valve in the above-mentioned embodiment. Any optional items in the embodiment of the motor-driven water-based proportional reversing valve are also applicable to the embodiment of the control method of the motor-driven water-based proportional reversing valve, which will not be repeated here.

[0071] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0072] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0073] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A motor-driven water-based proportional reversing valve, characterized in that: include: Motor; A pilot valve, comprising a pilot valve push rod and a pilot valve core, the motor is connected to the pilot valve push rod, and the pilot valve core comprises a pilot valve working port; A main valve core is connected to the working port of the pilot valve and the controlled load respectively; A proportional valve controller is connected to the motor, and is used to control the operation of the motor, drive the pilot valve push rod to extend and retract, and control the opening of the pilot valve working port, thereby driving the main valve core to move and controlling the operation of the controlled load.

2. The motor-driven water-based proportional reversing valve according to claim 1, characterized in that: An amplifying lever is also connected between the motor and the pilot valve push rod.

3. The motor-driven water-based proportional reversing valve according to claim 2, characterized in that: The motor includes a first motor and a second motor, the pilot valve includes a first pilot valve and a second pilot valve, the first pilot valve is arranged on a first side of the amplification lever, and the second pilot valve is arranged on a second side of the amplification lever, The first motor acts on the first end of the amplifying lever to drive the first pilot valve push rod of the first pilot valve to extend and retract; the second motor acts on the second end of the amplifying lever to drive the second pilot valve push rod of the second pilot valve to extend and retract.

4. The motor-driven water-based proportional reversing valve according to claim 3, characterized in that: The motor-driven water-based proportional reversing valve further includes a first displacement sensor connected to the motor, a flow sensor connected to the main valve core, and a second displacement sensor connected to the controlled load.

5. The motor-driven water-based proportional reversing valve according to claim 1, characterized in that: The motor-driven water-based proportional directional control valve is a load-sensitive water-based proportional directional control valve.

6. The motor-driven water-based proportional reversing valve according to claim 1, characterized in that: The motor is an intrinsically safe linear motor.

7. The motor-driven water-based proportional reversing valve according to claim 1, characterized in that: It also includes a digital pulse signal generator connected between the proportional valve controller and the motor.

8. A control method for a motor-driven water-based proportional reversing valve, characterized in that: The motor-driven water-based proportional reversing valve according to any one of claims 1 to 7, the method comprising: The proportional valve controller obtains first displacement information of the motor, flow information of the main valve core and second displacement information of the controlled load; The proportional valve controller adjusts the action parameters of the controlled load according to the first displacement information, the second displacement information and the second displacement information.

9. The control method of the motor-driven water-based proportional reversing valve according to claim 8, characterized in that: The motion parameters include the motion direction and motion speed of the controlled load.

10. The control method of the motor-driven water-based proportional reversing valve according to claim 8, characterized in that: The method further comprises: The proportional valve controller adjusts the pressure output by the main valve core to the controlled load by adjusting the flow rate of the pilot valve working port.

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