Water-based proportional direction valve, hydraulic support and control method of hydraulic cylinder

Abstract

The invention provides a water-based proportional direction valve, a hydraulic support and a hydraulic cylinder control method.The water-based proportional direction valve comprises a driving part, a pilot valve and a main valve, the pilot valve comprises a control cavity valve body, a liquid inlet flow channel and a liquid return flow channel are formed in the side face of the control cavity valve body, and a pilot control valve sleeve is arranged in the control cavity valve body; a pilot valve seat is arranged on the pilot control valve sleeve, the output end of the driving part is connected with a pilot driving rod, the pilot driving rod penetrates out of the pilot valve seat, and a pilot valve element is arranged at the end of the pilot driving rod. A main liquid inlet is formed in the side face of a liquid inlet valve sleeve in the main valve, a main liquid return opening is formed in the side face of a liquid return valve sleeve in the main valve, a liquid supply valve element is arranged in a liquid supply valve sleeve, a liquid return valve element is arranged in a liquid return valve sleeve, and a pilot valve element moves to drive a pilot control valve sleeve to move towards the main valve and sequentially drive the liquid return valve element and the liquid supply valve element to move. According to the embodiment of the invention, the opening degree of the liquid supply valve element and the opening degree of the liquid return valve element are accurately adjusted by one external control quantity, and the response speed is high.

Description

Technical Field

[0001] The present disclosure relates to the technical field of control valves, and in particular to a control method for a water-based proportional directional valve, a hydraulic support, and a hydraulic cylinder. Background Art

[0002] The coal mining face is composed of multiple hydraulic supports arranged in sequence on the working face, each of which is connected to the chute by a push jack. In order to achieve the normal operation of the working face, the hydraulic supports on multiple working faces need to maintain a certain degree of straightness. However, in the coal mining process, the coal mining face is basically a plane, and the chute is the track for the coal mining machine to run. This requires the chute to maintain a certain degree of straightness so that the coal mining machine can achieve a good coal cutting effect. In this way, in addition to supporting the top plate of the working face, the hydraulic support is also used to realize frame movement and chute pushing. The hydraulic support mainly realizes the chute pushing operation through the hydraulic cylinder.

[0003] At present, most hydraulic cylinders that realize displacement use two-position three-way switch valves or multi-stage speed regulating valves based on time control to realize position control. Since the existing two-position three-way switch valves cannot realize stepless proportional control of flow, there is still a lot of room for improvement in control accuracy. Summary of the invention

[0004] In view of this, the present disclosure aims to provide a control method for a water-based proportional directional valve, a hydraulic support and a hydraulic cylinder to solve the technical problems in the related art that stepless proportional control of flow cannot be achieved and the control accuracy is low.

[0005] One aspect of the present disclosure provides a water-based proportional directional valve, comprising a driving part, a pilot valve and a main valve connected in sequence, the pilot valve comprising a control chamber valve body, a liquid inlet channel and a liquid return channel are arranged on the side of the control chamber valve body, a movable pilot control valve sleeve is arranged in the control chamber valve body, a pilot valve seat is arranged on the pilot control valve sleeve, an output end of the driving part is connected to a pilot driving rod, the pilot driving rod passes through the pilot valve seat, and a pilot valve core is arranged at the end of the pilot driving rod; the main valve comprises a liquid return valve sleeve and a liquid supply valve sleeve, a main liquid inlet port is arranged on the side of the liquid inlet valve sleeve, a main liquid return port is arranged on the side of the liquid return valve sleeve, a liquid supply valve core is arranged in the liquid supply valve sleeve, and a liquid return valve core is arranged in the liquid return valve sleeve, the pilot control valve sleeve, the liquid return valve core and the liquid supply valve core are arranged in sequence, and the movement of the pilot valve core drives the pilot control valve sleeve to move toward the direction of the main valve and drives the liquid return valve core and the liquid supply valve core to move in sequence.

[0006] In some embodiments, the control chamber valve body comprises a valve core drive chamber and a valve core reset chamber, the valve core drive chamber and the valve core reset chamber are respectively located on both sides of the pilot control valve sleeve, and there is an area difference between the cross-sectional areas of the two chambers of the valve core drive chamber and the valve core reset chamber.

[0007] In some embodiments, an end cover is disposed on the inner side of the end of the control chamber valve body, and the driving part is disposed on the outer side of the end cover.

[0008] In some embodiments, a pilot valve core seat is disposed inside the pilot control valve sleeve and is disposed opposite to the pilot valve core. The pilot valve core seat is connected to the bottom of the pilot control valve sleeve via a first return spring.

[0009] In some embodiments, a positioning screw is arranged between the liquid return valve sleeve and the liquid supply valve sleeve, and a second return spring is arranged between the liquid supply valve core and the liquid supply valve sleeve.

[0010] In some embodiments, a first liquid return sealing gasket is disposed between the liquid return valve core and the pilot control valve sleeve, and a second liquid return sealing gasket is disposed between the liquid supply valve core and the liquid return valve sleeve.

[0011] In some embodiments, damping screw plugs are provided in the liquid inlet channel and the liquid return channel.

[0012] In some embodiments, a force balancing sleeve is provided between the liquid return valve core and the control chamber valve body, and a force balancing flow channel is provided on the pilot control valve sleeve.

[0013] Another aspect of the present disclosure provides a hydraulic support, which includes a hydraulic cylinder and any one of the water-based proportional directional valves described above.

[0014] Another aspect of the present disclosure provides a control method for a hydraulic cylinder, wherein the hydraulic cylinder is driven by any of the water-based proportional directional valves described above, and the control method comprises:

[0015] Get the current position, current speed, target speed and target position of the piston in the hydraulic cylinder;

[0016] Based on the current position, the current speed, the target speed and the target position, a telescopic position and a telescopic speed of a driving rod of a driving part in the water-based proportional directional valve are determined.

[0017] The disclosed embodiment adopts a proportional valve or digital valve with low power consumption and low drive proportional control based on the principle of pilot position following, so as to achieve precise adjustment of the opening of the liquid supply valve core and the opening of the liquid return valve core by one external control quantity, and relies on the hydraulic pressure to drive the main valve core to have a higher response speed.

[0018] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a water-based proportional directional valve according to an embodiment of the present disclosure;

[0021] Figure 2 is a schematic diagram of a water-based proportional directional valve in an initial state according to an embodiment of the present disclosure;

[0022] Figure 3 is a schematic diagram of a water-based proportional directional valve according to an embodiment of the present disclosure with a liquid supply valve port opened;

[0023] Figure 4 is a schematic diagram of a main valve in a water-based proportional directional valve in an embodiment of the present disclosure being in force balance;

[0024] Figure 5 is a schematic diagram of the structure of a control system for controlling a hydraulic cylinder through a water-based proportional directional valve in an embodiment of the present disclosure;

[0025] Figure 6 It is a schematic diagram of a flow chart of controlling a hydraulic cylinder by a water-based proportional directional valve in an embodiment of the present disclosure.

[0026] The above drawings include the following reference numerals:

[0027] 1-motor; 2-end cover; 3-control chamber valve body; 4-motor drive rod; 5-pilot control valve sleeve; 6-pilot drive rod; 7-pilot valve seat; 8-pilot valve core; 9-pilot valve core seat; 10-first return spring; 11-return valve sleeve; 12-supply valve sleeve; 13-second return spring; 14-second return liquid sealing pad; 15-positioning screw; 16-supply valve core; 17-return valve core; 18-first return liquid sealing pad; 19-force balancing sleeve; 20-damping screw plug; 21-valve core drive chamber; 22-valve core reset chamber; 23-liquid inlet channel; 24-valve core force balancing chamber; 25-force balancing channel; 26-return liquid channel; 27-main liquid inlet; 28-main return liquid port; 29-liquid passage; 30-knob. DETAILED DESCRIPTION

[0028] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0029] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments 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 disclosed 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.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0036] 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.

[0037] The first embodiment of the present disclosure provides a water-based proportional directional valve, which can be used to control the action of a hydraulic cylinder, thereby achieving control of a hydraulic support, such as Figure 1-Figure 4 As shown, the water-based proportional directional valve includes a driving unit, a pilot valve and a main valve, wherein the driving unit, the pilot valve and the main valve are connected in sequence, and the driving unit drives the pilot valve to drive the main valve to perform a predetermined action. In this embodiment, the driving unit adopts a motor 1, and of course other devices such as a proportional solenoid can also be used. A knob 30 is provided on the motor 1, and manual control can be achieved through the knob 30.

[0038] Specifically, the pilot valve includes a control chamber valve body 3, and the main valve includes a return liquid valve sleeve 11 and a supply liquid valve sleeve 12, wherein the two ends of the control chamber valve body 3 are open, an end cover 2 is provided on the inner side of the first end of the control chamber valve body 3, and the motor 1 is provided on the outer side of the end cover 2; the first end of the return liquid valve sleeve 11 is connected to the second end of the control chamber valve body 3, and the second end of the return liquid valve sleeve 11 is connected to the first end of the supply liquid valve sleeve 12.

[0039] Further, a pilot control valve sleeve 5 is arranged in the control chamber valve body 3, the pilot control valve sleeve 5 can move in the control chamber valve body 3, a pilot valve seat 7 is arranged on the pilot control valve sleeve 5, and the pilot valve seat 7 has a through hole. Specifically, the pilot control valve sleeve 5 here is a U-shaped structure, the opening of the U-shaped structure is arranged toward the end cover 2, the pilot valve seat 7 is arranged on the inner side of the opening of the pilot control valve sleeve 5, and a liquid flow channel 29 is arranged on the side of the U-shaped structure.

[0040] Further, the output end of the motor 1 is connected to one end of the motor drive rod 4, and the other end of the motor drive rod 4 is connected to the pilot drive rod 6. The pilot drive rod 6 can pass through the through hole on the pilot valve seat 7. The end of the pilot drive rod 6 is provided with a pilot valve core 8, and the pilot valve core 8 here can be a spherical structure, for example. In this way, the motor 1 drives the pilot drive rod 6 to move through the motor drive rod 4, thereby driving the pilot valve core 8 to move toward the main valve or away from the main valve.

[0041] Furthermore, in order to control the movement of the pilot valve core 8, a pilot valve core seat 9 is arranged inside the pilot control valve sleeve 5, which is arranged opposite to the pilot valve core 8. The pilot valve core seat 9 is connected to the bottom of the pilot control valve sleeve 5 through a first return spring 10, so that when the pilot valve core 8 moves toward the main valve, it will resist against the pilot valve core seat 9 and be subject to the force of the first return spring 10.

[0042] Furthermore, a positioning screw 15 is provided between the liquid return valve sleeve 11 and the liquid supply valve sleeve 12, and the positioning screw 15 can realize accurate connection between the liquid return valve sleeve 11 and the liquid supply valve sleeve 12, and can also maintain the sealing inside the main valve.

[0043] Furthermore, a movable liquid supply valve core 16 is arranged in the liquid supply valve sleeve 12, and a movable liquid return valve core 17 is arranged in the liquid return valve sleeve 11. The pilot control valve sleeve 5, the liquid return valve core 17 and the liquid supply valve core 16 are arranged in sequence. When the pilot control valve sleeve 5 moves toward the direction of the main valve, the liquid return valve core 17 will be driven to move, and further drive the liquid supply valve core 16 to move.

[0044] A second return spring 13 is disposed between the liquid supply valve core 16 and the liquid supply valve sleeve 12 , and the second return spring 13 facilitates the liquid supply valve core 16 to move toward the direction of the pilot valve to achieve return.

[0045] In addition, a first liquid return sealing gasket 18 is arranged between the liquid return valve core 17 and the pilot control valve sleeve 5. The pilot valve here only uses one seal to ensure that the opening control of the main valve is achieved with lower power, which meets the needs of mining use; in addition, a second liquid return sealing gasket 14 is arranged between the liquid supply valve core 16 and the liquid return valve sleeve 11. The first liquid return sealing gasket 18 and the second liquid return sealing gasket 14 are used to ensure the sealing between the liquid return valve core 17 and the pilot control valve sleeve 5 and the sealing between the liquid supply valve core 16 and the liquid return valve sleeve 11 respectively.

[0046] Further, a control port A is provided at the end of the liquid inlet valve sleeve 12, a main liquid inlet port 27 is provided on the side of the liquid inlet valve sleeve 12, and a main liquid return port 28 is provided on the side of the liquid return valve sleeve 11; in addition, a liquid inlet channel 23 and a liquid return channel 26 are provided on the side of the control chamber valve body 3, wherein the main liquid inlet port 27 and the liquid inlet channel 23 are located on the first side of the water-based proportional directional valve and are both connected to an external liquid supply source, wherein the liquid supply source is used to provide water, and the main liquid return port 28 and the liquid return channel 26 are located on the second side of the water-based proportional directional valve. Here, the main liquid inlet port 27 and the liquid inlet channel 23 form a liquid inlet channel P, and the main liquid return port 26 and the liquid return channel 28 form a liquid return channel R.

[0047] Furthermore, a damping screw plug 20 is disposed in the liquid inlet flow channel 23 and the liquid return flow channel 26 , and the damping screw plug 20 is used to control the opening and closing of the liquid inlet flow channel 23 and the liquid return flow channel 26 .

[0048] In addition, in order to maintain the force balance between the return liquid valve core 17 and the control chamber valve body 3, a force balancing chamber 24 is formed between the return liquid valve core 17 and the control chamber valve body 3, a force balancing sleeve 19 is arranged between the return liquid valve core 17 and the control chamber valve body 3, and a force balancing flow channel 25 is arranged on the pilot control valve sleeve 5.

[0049] Furthermore, the control chamber valve body 3 has a valve core drive chamber 21 and a valve core reset chamber 22, and the valve core drive chamber 21 and the valve core reset chamber 22 are respectively located on both sides of the pilot control valve sleeve 5, wherein there is an area difference between the cross-sectional areas of the two chambers of the valve core drive chamber 21 and the valve core reset chamber 22, wherein the cross-sectional area of ​​the valve core drive chamber 21 is larger than the cross-sectional area of ​​the valve core reset chamber 22.

[0050] In the initial state, the pilot valve core 8 is located in the through hole of the pilot valve seat 7, so that the valve core drive chamber 21 and the valve core reset chamber 22 are not connected, and the motor 1 drives the pilot drive rod 6 to move through the extension and contraction of the motor drive rod 4, thereby promoting the movement of the pilot valve core 8, so that the valve core drive chamber 21 and the valve core reset chamber 22 are connected, so that a pressure difference is formed after the pilot valve core 8 moves to push the pilot control valve sleeve 5 to follow the pilot valve core 8.

[0051] The implementation of the present disclosure is as follows Figure 2-Figure 3 As shown, among which, Figure 2 As shown, Figure 2The water-based proportional directional valve is shown in an initial state. In the initial state, the valve core drive chamber 21 is connected to the return liquid flow channel 26, and the valve core reset chamber 22 is connected to the inlet liquid flow channel 23. The inlet liquid flow channel 23 and the return liquid flow channel 26 are both blocked by the damping screw plug 20. At this time, the pressure in the valve core drive chamber 21 is zero, and the pressure in the valve core reset chamber 22 is the pressure P of the external liquid supply source. In this way, there is a pressure difference between the valve core drive chamber 21 and the valve core reset chamber 22. In the initial state, the main return liquid port 28 is in an open state. The pilot valve core 8 blocks the through hole on the pilot valve seat 7 under the pressure difference between the two chambers and the action of the first reset spring 10, thereby sealing the valve core drive chamber 21 and the valve core reset chamber 22, that is, cutting off the connection between the valve core reset chamber 22 and the valve core drive chamber 21.

[0052] The motor 1 is operated to push the pilot drive rod 6 to drive the pilot valve core 8 to Figure 2 The pilot valve core 8 moves a certain distance L to the right side, and leaves the through hole, so that the valve core driving chamber 21 is connected with the valve core reset chamber 22. After the two chambers are connected, the pressure in the valve core driving chamber 21 rises accordingly.

[0053] Here, due to the difference in cross-sectional area between the valve core drive chamber 21 and the valve core reset chamber 22, the pressure action area of ​​the valve core drive chamber 21 is larger than the pressure action area of ​​the valve core reset chamber 22, so that under the action of the pressure difference, the pilot control valve sleeve 5 can be moved at a lower pressure, that is, the pilot control valve sleeve 5 is pushed to Figure 2 The pilot valve seat 7 moves to the right side until the pilot valve seat 7 follows the pilot control valve sleeve 5 and moves a distance L and fits with the pilot valve core 8. At this time, the pilot control valve sleeve 5 moves to the right to a stop state, thereby completing a following movement for the pilot valve core 8.

[0054] Further, here, as the motor 1 pushes the pilot valve core 8 to continue to Figure 2 At this time, the control port A and the liquid return channel R are connected, so that the liquid return valve core 17 moves to the right side. Figure 2 The main liquid return port 28 moves to the right side to continuously reduce its opening until the main liquid return port 28 is blocked by the liquid return valve core 17 and closed.

[0055] The motor 1 continues to push the pilot valve core 8 to Figure 2 The liquid return valve core 17 moves to the right side, so that the liquid supply valve core 16 moves to the right side. In this way, as the liquid supply valve core 16 and the second sealing gasket 14 are separated, the opening of the liquid supply valve core 16 is continuously increased.

[0056] In the above steps, the damping screw plug 20 with a damping function cooperates with the pilot valve core 8 to adjust the pressure of the two chambers in the pilot control valve sleeve 5, thereby achieving position follow-up control of the pilot control valve sleeve 5 and realizing the forward or backward movement of the main valve.

[0057] In the above-mentioned adjustment process, the force balance of the liquid supply valve core 17 is achieved. Here, the first liquid return sealing gasket 18 is installed on the pilot control valve sleeve 5 by, for example, a threaded connection method. The closing of the liquid return valve core 17 relies on the hydraulic thrust F1 on the right side of the liquid supply valve core 16 and the hydraulic balance force F2 on the left side of the liquid supply valve core 16, so that the liquid supply valve core 16 is pressed against the second liquid return sealing gasket 14 to achieve liquid return sealing; the opening adjustment of the main liquid return port 28 relies on the specific chamfer of the screw to achieve linear adjustment between the liquid return flow rate and the position of the liquid return valve core 17.

[0058] Here, the return valve core 17 has a hydraulic balance setting. When the first return seal 18 of the return valve core 17 just contacts the supply valve core 16 for sealing, the right side of the supply valve core 16 is subjected to a hydraulic thrust F1 = PA*S3, and the left side of the supply valve core 16 is subjected to a hydraulic balance force F2 = PA*(S1-S2). Since S1-S2 = S3, the hydraulic pressure balance of the two is used to reduce the pilot drive resistance, thereby improving the response speed of the main valve. Here, S1 refers to the cross-sectional area of ​​the force balance sleeve 19, S2 refers to the cross-sectional area of ​​the pilot control valve sleeve 5, and S3 refers to the pressure area of ​​the supply valve core 16.

[0059] In addition, the liquid supply valve core 16 is reset by the second reset spring 13. In the initial state, due to the high-pressure liquid in the liquid supply channel P, the liquid supply valve core 16 and the second liquid return sealing gasket 14 are pressed tightly to achieve the sealing of PA. The pilot control valve sleeve 5 drives the liquid return valve core 16 to push the liquid supply valve core 16 to open slowly to achieve soft start and precise adjustment of the opening, thereby realizing linear control of the flow rate.

[0060] like Figure 3 As shown, the opening of the liquid supply valve core 16 is continuously increased so that the flow capacity between the liquid inlet channel P and the control port A is continuously improved until the opening of the liquid supply valve core 16 reaches the maximum position, thereby achieving full opening of the main liquid inlet 27.

[0061] On the other hand, when the pilot valve core 8 moves in the opposite direction (i.e., Figure 2 When the main liquid inlet 27 is gradually closed and the main liquid return port 28 is gradually opened due to the follow-up characteristics, the main liquid inlet 27 is gradually closed and the main liquid return port 28 is gradually opened.

[0062] Therefore, based on the above steps, the linear regulation of the return liquid flow rate between the control port A and the return liquid channel R and the linear regulation of the supply liquid flow rate between the inlet channel P and the control port A are achieved.

[0063] In this way, the displacement of the liquid supply valve core 16 can be accurately controlled by the moving distance of the pilot valve core 8, so that the liquid supply valve core 16 and the pilot valve core 8 can be controlled by follow-up, and the valve core opening of the liquid supply valve core 16 can be continuously adjusted as well as the inlet and return flow rates of the main liquid inlet 27 and the main liquid return port 28 can be accurately controlled, thereby reducing the pressure shock caused by the opening and closing of the valve port and improving the control accuracy of the hydraulic cylinder.

[0064] Specifically, the pilot valve core 8 in the present embodiment can stop at any position in the stroke under the push of the motor 1. Due to the follow-up characteristics, the pilot control valve sleeve 5 and the liquid supply valve core 16 stop moving accordingly, so that the main liquid inlet 27 on the liquid supply valve sleeve 12 and the main liquid return port 28 on the liquid return valve sleeve 11 can be adjusted to any opening, thereby achieving the purpose of linear flow regulation.

[0065] The motor 1 in this embodiment can be a stepping linear motor, so as to drive the pilot valve core 8 to move and retract, and the displacement accuracy of the retracting can reach 0.01mm, so the retracting displacement of the pilot valve core 8 and the retracting displacement of the liquid supply valve core 16 can achieve 0.01mm retracting. The stepping linear motor here does not have a power-off brake function. After the motor is powered off or damaged and loses power, the pilot control valve sleeve 5 is reset by the unbalanced force between the two chambers, realizing the protection function of motor power off and power loss.

[0066] In addition, the stepper linear motor here has a manual drive function, and after the power is cut off underground, the opening of the main valve can be adjusted by manually operating the knob 30 to realize manual control of the hydraulic cylinder. Specifically, if there is a power outage in the coal mine, the motor loses power and no longer outputs power. The sealing ball is reset and sealed under the dual action of the pilot reset spring and the hydraulic pressure. The valve core drive chamber is connected to the return liquid R, and the pressure in the chamber is continuously reduced. The pilot control valve sleeve is continuously reset to the left by the hydraulic driving force of the reset chamber until it contacts the end cover and returns to the initial position to connect the A port with the R return liquid, realizing the self-locking when the power is cut off during the working process.

[0067] The motor 1 in this embodiment integrates manual and automatic functions, and realizes variable opening control of the main valve and closed-loop control by manually driving the motor.

[0068] A second embodiment of the present disclosure provides a control method for a hydraulic cylinder, wherein the hydraulic cylinder is disposed in a hydraulic support, a piston is disposed in the hydraulic cylinder, and the piston in the hydraulic cylinder is driven by any of the above-mentioned water-based proportional directional valves, and the control method includes:

[0069] Get the current position, current speed, target speed and target position of the piston in the hydraulic cylinder;

[0070] Based on the current position, the current speed, the target speed and the target position, a telescopic position and a telescopic speed of a driving rod of a driving part in the water-based proportional directional valve are determined.

[0071] Specifically, Figure 5 and Figure 6 As shown, the water-based proportional directional valve involved in this embodiment can be used for position monitoring and adjustment of the piston in the hydraulic cylinder, for example, the position information and speed information of the piston in the hydraulic cylinder 2 are monitored in real time by the displacement detection unit, and the current position, current speed, target speed and target position of the piston in the hydraulic cylinder 2 are input to the controller; based on the current position, the current speed, the target speed and the target position, the controller converts the control instructions for the displacement and speed of the motor 1 into the number of pulses and the pulse frequency of the pulse signal, and transmits the number of pulses and the pulse frequency to the motor 1 of the water-based proportional directional valve, and determines the telescopic position and telescopic speed of the motor drive rod 4 in the motor 1, thereby determining the speed and position change information of the piston. Here, since the position of the liquid supply valve core 16 of the water-based proportional directional valve and the position of the pilot valve core 8 have a position follow-up closed loop relationship, that is, the position and speed of the pilot valve core 8 determine the position and speed of the liquid supply valve core 16, and the telescopic speed and telescopic position of the hydraulic cylinder 2 are controlled by the continuous change of the opening of the liquid supply valve core 16.

[0072] When the position of the hydraulic cylinder 2 changes to within the deviation range of the target position, the water-based proportional directional valve is controlled to reset, so that the piston of the hydraulic cylinder 2 stops moving, and the hydraulic cylinder 2 is locked by a hydraulically controlled one-way lock, thereby completing the speed and position dual control closed loop of the hydraulic cylinder 2.

[0073] A third embodiment of the present disclosure provides a hydraulic support, which includes a hydraulic cylinder and any of the water-based proportional directional valves described above, and uses the above-mentioned control method to control the movement of the hydraulic cylinder through the water-based proportional directional valve.

[0074] The disclosed embodiment adopts a proportional valve or digital valve with low power consumption and low drive proportional control based on the principle of pilot position following, so as to achieve precise adjustment of the opening of the liquid supply valve core and the opening of the liquid return valve core by one external control quantity, and relies on the hydraulic pressure to drive the main valve core to have a higher response speed.

[0075] In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0077] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present disclosure.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A water-based proportional directional valve, characterized in that: The invention comprises a driving part, a pilot valve and a main valve which are connected in sequence, the pilot valve comprising a control chamber valve body, a liquid inlet channel and a liquid return channel are arranged on the side of the control chamber valve body, a movable pilot control valve sleeve is arranged in the control chamber valve body, a pilot valve seat is arranged on the pilot control valve sleeve, an output end of the driving part is connected to a pilot driving rod, the pilot driving rod passes through the pilot valve seat, and a pilot valve core is arranged at the end of the pilot driving rod; the main valve comprises a liquid return valve sleeve and a liquid supply valve sleeve, a main liquid inlet port is arranged on the side of the liquid inlet valve sleeve, a main liquid return port is arranged on the side of the liquid return valve sleeve, a liquid supply valve core is arranged in the liquid supply valve sleeve, and a liquid return valve core is arranged in the liquid return valve sleeve, the pilot control valve sleeve, the liquid return valve core and the liquid supply valve core are arranged in sequence, and the movement of the pilot valve core drives the pilot control valve sleeve to move toward the direction of the main valve and drives the liquid return valve core and the liquid supply valve core to move in sequence.

2. The water-based proportional directional valve according to claim 1, characterized in that: The control chamber valve body is provided with a valve core driving chamber and a valve core reset chamber, the valve core driving chamber and the valve core reset chamber are respectively located on both sides of the pilot control valve sleeve, and there is an area difference between the cross-sectional areas of the two chambers of the valve core driving chamber and the valve core reset chamber.

3. The water-based proportional directional valve according to claim 1, characterized in that: An end cover is arranged inside the end of the control chamber valve body, and the driving part is arranged outside the end cover.

4. The water-based proportional directional valve according to claim 1, characterized in that: A pilot valve core seat is arranged inside the pilot control valve sleeve and is arranged opposite to the pilot valve core. The pilot valve core seat is connected to the bottom of the pilot control valve sleeve via a first return spring.

5. The water-based proportional directional valve according to claim 4, characterized in that: A positioning screw is arranged between the liquid return valve sleeve and the liquid supply valve sleeve, and a second return spring is arranged between the liquid supply valve core and the liquid supply valve sleeve.

6. The water-based proportional directional valve according to claim 1, characterized in that: A first liquid return sealing gasket is arranged between the liquid return valve core and the pilot control valve sleeve, and a second liquid return sealing gasket is arranged between the liquid supply valve core and the liquid return valve sleeve.

7. The water-based proportional directional valve according to claim 1, characterized in that: Damping screw plugs are arranged in the liquid inlet flow channel and the liquid return flow channel.

8. The water-based proportional directional valve according to claim 1, characterized in that: A force balancing sleeve is arranged between the liquid return valve core and the control chamber valve body, and a force balancing flow channel is arranged on the pilot control valve sleeve.

9. A hydraulic support, comprising a hydraulic cylinder and a water-based proportional directional valve according to any one of claims 1 to 8.

10. A method for controlling a hydraulic cylinder, wherein the hydraulic cylinder is driven by the water-based proportional directional valve according to any one of claims 1 to 8, the control method comprising: Get the current position, current speed, target speed and target position of the piston in the hydraulic cylinder; Based on the current position, the current speed, the target speed and the target position, a telescopic position and a telescopic speed of a driving rod of a driving part in the water-based proportional directional valve are determined.

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