Ultrahigh-pressure proportional unloading valve for emulsion pump station

Abstract

The ultrahigh-pressure proportional unloading valve for the emulsion pump station comprises a proportional unloading valve assembly, a mechanical pilot valve assembly, a proportional pilot valve assembly and a sensor assembly, the mechanical pilot valve assembly is arranged on one side, in the first horizontal direction, of the proportional unloading valve assembly, and the proportional pilot valve assembly is arranged on the other side of the proportional unloading valve assembly; the sensor assembly is arranged at the top of the proportional unloading valve assembly, and the proportional unloading valve assembly is configured to pressurize high-pressure liquid flowing out of an outlet of the emulsion pump station and further supply the pressurized high-pressure liquid to the hydraulic support; the proportional pilot valve assembly is configured to unload the high pressure liquid passing through the proportional unloading valve assembly. According to the ultrahigh-pressure proportional unloading valve for the emulsion pump station, the unloading valve assembly, the mechanical pilot valve assembly, the proportional pilot valve assembly and the sensor assembly are matched, so that the proportional unloading valve has the function of performing interval regulation and control on the outlet pressure of the emulsion pump station.

Description

Technical Field

[0001] The present invention relates to the technical field of unloading valves for the liquid supply system of emulsion pump stations, and particularly relates to an ultra-high pressure proportional unloading valve for an emulsion pump station. Background Art

[0002] During the fully mechanized mining process, hydraulic supports need to move the supports, raise the columns, lower the columns, etc. Each action of the hydraulic support has different requirements for the amount of emulsion used and the pressure control level. The discontinuity of the support actions causes the intermittency and randomness of the liquid supply of the emulsion pump station, requiring the unloading valve that plays a pressure regulating role in the liquid supply system to be able to respond quickly and adjust the output pressure of the high-pressure pump in a timely manner.

[0003] The unloading valve is a pressure control component of the liquid supply system of the emulsion pump station. When the hydraulic support acts, the unloading valve supplies liquid. When the hydraulic support does not act, the unloading valve relieves pressure. The outlet of the emulsion pump station is connected to the inlet of the unloading valve, the outlet of the unloading valve is connected to the inlet of the hydraulic support, and the outlet of the unloading valve is connected to the liquid tank of the pump station system. It mainly has two working states: unloading and boosting. In the boosting state, the spools of the proportional pilot valve and the mechanical unloading valve are closed. The high-pressure liquid at the outlet of the pump station flows in from the inlet of the unloading valve, and the check valve is opened under the action of the liquid pressure and finally flows to the hydraulic support for liquid supply through the outlet of the check valve. When the pump station liquid supply system needs to unload, the integrated command platform obtains the corresponding voltage control amount through algorithm analysis and sends this control amount to the proportional unloading valve controller. After receiving the signal, the controller outputs a voltage to the electromagnet driver, and the driver controls the proportional electromagnet to output an electromagnetic force. The spool of the proportional pilot valve moves to the equilibrium position, and finally the spool tends to be stable. The controller controls the opening degree of the pilot valve spool to control the flow rate of the high-pressure fluid at the inlet of the main valve flowing through the damping hole, so as to control the displacement of the main valve spool and finally control the magnitude of the unloading pressure of the main valve.

[0004] The proportional unloading valve can control the unloading pressure between 1.2 MPa and 50 MPa. When the hydraulic support needs to unload, the controller controls the opening degree of the main valve of the proportional unloading valve to unload part of the pressure. When the hydraulic support needs to boost, the controller controls the main valve of the proportional unloading valve to be completely closed and rebuilds the pressure to 50 MPa again. Different from the switch-type unloading valve that unloads all the pressure, the proportional unloading valve unloads according to the liquid usage requirements of the hydraulic support, without having to rebuild the pressure from the lowest pressure to the highest rated pressure of the pump station liquid supply system, greatly reducing the boost time, achieving flow-matched liquid supply, and improving the system efficiency.

[0005] For the above reasons, there is an urgent need in the art to design an unloading valve for an emulsion pump station that can supply liquid quickly according to demand, regulate pressure in multiple intervals, and adopts a new design concept. Summary of the Invention

[0006] In view of the above deficiencies or improvement requirements of the prior art, the present invention provides an ultra-high pressure proportional unloading valve for an emulsion pump station, which controls the main valve assembly through a proportional pilot valve assembly, so that the main valve assembly has a proportional unloading function. The proportional pilot valve assembly can control the opening degree of the main valve spool, and then regulate the outlet pressure of the emulsion pump station within a range, meeting the fast response of the pump station liquid supply system and the requirement of adjusting the output pressure of the high-pressure pump as needed.

[0007] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0008] An ultra-high pressure proportional unloading valve for an emulsion pump station, which includes a proportional unloading valve assembly, a mechanical pilot valve assembly, a proportional pilot valve assembly and a sensor assembly, wherein:

[0009] The inlet of the proportional unloading valve assembly is connected to the emulsion pump station, the outlet of the proportional unloading valve assembly is connected to a hydraulic support, and the outlet of the proportional unloading valve assembly is connected to the liquid tank of the pump station system;

[0010] The mechanical pilot valve assembly is arranged on one side of the proportional unloading valve assembly along the first horizontal direction, the proportional pilot valve assembly is arranged on the other side of the proportional unloading valve assembly along the first horizontal direction, and the sensor assembly is arranged on the top of the proportional unloading valve assembly.

[0011] The proportional unloading valve assembly is configured to pressurize the high-pressure liquid flowing out of the outlet of the emulsion pump station, and then supply the pressurized high-pressure liquid to the hydraulic support.

[0012] The proportional pilot valve assembly is configured to unload the high-pressure liquid passing through the proportional unloading valve assembly.

[0013] Optionally, the proportional unloading valve assembly includes a first housing, a main valve assembly and a check valve assembly. The sensor assembly is arranged on the top of the first housing, the main valve assembly is arranged at the inner top of the first housing, and the check valve assembly is arranged below the main valve assembly.

[0014] In the pressurized state, the proportional pilot valve assembly and the mechanical pilot valve assembly are closed. The high-pressure liquid at the outlet of the emulsion pump station flows into the proportional unloading valve assembly through the inlet, passes through the main valve assembly, the check valve assembly is opened under the action of the liquid pressure, and finally flows through the outlet of the check valve assembly to supply liquid to the hydraulic support.

[0015] Optionally, the main valve assembly includes a main valve spring, a main valve seat and a main valve spool. The main valve seat is fixedly installed on the top of the first housing, the main valve spool is nested on the main valve seat, and the main valve spring is arranged on the main valve spool.

[0016] Optionally, the one-way valve assembly includes a one-way valve spool, a one-way valve spring, a one-way valve seat, and a one-way valve plug. The one-way valve plug is disposed at the bottom end of the first housing. The one-way valve spring is disposed at the bottom of the first housing, and one end of the one-way valve spring abuts against the one-way valve plug. The one-way valve spool is sleeved on the spring, and the one-way valve seat is sleeved on the one-way valve spool.

[0017] Optionally, the proportional pilot valve assembly includes a second housing, a pilot valve process plug, a proportional pilot valve seat, a proportional pilot valve plug, a proportional pilot valve spring, a proportional pilot valve spring seat, a proportional pilot valve ball spool, a valve seat large hole, a push rod, a push rod guide sleeve, and a lever assembly. The second housing is disposed on the side wall of the proportional unloading valve assembly. The proportional pilot valve plug is disposed at the first end of the second housing along the second horizontal direction. The first horizontal direction and the second horizontal direction are perpendicular to each other. A receiving hole is formed in the proportional pilot valve plug. The proportional pilot valve spring is disposed in the receiving hole. The proportional pilot valve spring seat is disposed at the opening of the receiving hole. One end of the proportional pilot valve spring abuts against the inner wall of the receiving hole, and the other end of the proportional pilot valve spring abuts against the first side of the proportional pilot valve spring seat along the first horizontal direction. The proportional pilot valve seat is disposed on the second side of the proportional pilot valve spring seat along the first horizontal direction. A proportional pilot valve ball spool is disposed on the proportional pilot valve seat. The proportional pilot valve ball spool abuts against one end of the push rod. The push rod guide sleeve is sleeved on the push rod. The pilot valve process plug is disposed at the second end of the second housing along the second horizontal direction. The second end of the second housing along the second horizontal direction is connected to the lever assembly.

[0018] Optionally, the lever assembly includes a first lever mechanism housing, a second lever mechanism housing, an eddy current sensor measured end cover, a first aligning ball, an upper end cover, a lever, a second aligning ball, an eddy current sensor connecting rod, a lever sliding shaft, an electromagnet connecting block, a proportional electromagnet, an inner hexagon bolt, a hexagon nut, a lever screw, and a proportional pilot valve eddy current displacement sensor. The first end of the first lever mechanism housing along the second horizontal direction is connected to the second housing. The second end of the first lever mechanism housing along the second horizontal direction is connected to the second lever mechanism housing. The eddy current sensor measured end cover is fixed on the second lever mechanism housing through the inner hexagon bolt. The upper end cover is disposed at one end of the first lever mechanism housing along the first horizontal direction;

[0019] The first aligning ball is disposed between the first lever mechanism housing and the second housing. The lever screw is disposed inside the first lever mechanism housing. One end of the lever screw is close to the first aligning ball, and the other end of the lever screw is fixedly installed on one side of the lever along the second horizontal direction. The other side of the lever along the second horizontal direction is movably installed at one end of the eddy current sensor connecting rod through the lever sliding shaft. The other end of the eddy current sensor connecting rod is connected to the proportional pilot valve eddy current displacement sensor. The proportional pilot valve eddy current displacement sensor is fixed on the second lever mechanism housing through the hexagon nut;

[0020] The second end of the outer cover of the first lever mechanism along the second horizontal direction is also connected with a proportional electro - magnet through an electro - magnet connecting block. A second aligning ball is arranged between the proportional electro - magnet and the outer cover of the first lever mechanism. One end of the second aligning ball abuts against the proportional electro - magnet, and the other end of the second aligning ball abuts against the lever.

[0021] Optionally, the proportional pilot valve assembly further includes a pilot valve liquid distribution plate and a filter. The pilot valve liquid distribution plate is arranged between the proportional pilot valve assembly and the proportional unloading valve assembly, and the filter is arranged at the bottom of the proportional pilot valve assembly.

[0022] Optionally, the sensor assembly includes a main valve displacement measured rod, a displacement sensor mounting block, a main valve eddy current displacement sensor, a sensor rod bushing, a sensor end cover and a sensor adjusting nut. The displacement sensor mounting block is installed at the top of the first housing. The first end of the main valve displacement measured rod passes through the displacement sensor mounting block and is threadedly connected to the main valve spool. The second end of the main valve displacement measured rod is fixedly connected to the sensor end cover by threads. The sensor rod bushing is arranged on the displacement sensor mounting block, and the main valve eddy current displacement sensor is installed on the sensor rod bushing through an adjusting nut. The main valve eddy current displacement sensor is configured to monitor the displacement of the sensor end cover, and thus detect the displacement of the main valve spool.

[0023] Optionally, the inlet chamber of the proportional unloading valve assembly is connected to the outlet of the emulsion pump station, the outlet chamber of the proportional unloading valve assembly is connected to the emulsion tank, and the outlet chamber of the one - way valve assembly is connected to the working face.

[0024] Optionally, the setting pressure of the mechanical pilot valve assembly is greater than the setting pressure of the proportional pilot valve assembly.

[0025] The beneficial effects of the present invention are as follows. Compared with the prior art, a super - high - pressure proportional unloading valve for an emulsion pump station provided by the present invention has the following beneficial effects:

[0026] 1. Connect the upper chamber of the main valve assembly to the inlet chamber of the proportional pilot valve assembly, and arrange a damping element between the inlet chamber of the proportional unloading valve assembly and the upper chamber of the main valve assembly. When the working face pressure reaches the unloading pressure, the valve orifice of the proportional pilot valve assembly is opened under the control of the proportional electro - magnet. As the pressure in the upper chamber of the main valve assembly decreases, the main valve assembly also opens quickly and smoothly at a predetermined gradient and speed, so that the inlet pressure of the proportional unloading valve assembly, that is, the outlet pressure of the emulsion pump station, is smoothly reduced, and finally the unloading purpose is achieved.

[0027] 2. The sensor assembly is installed at the upper end of the spring chamber of the main valve spool, greatly reducing the volume of the upper spring chamber and significantly improving the dynamic characteristics of the proportional unloading valve assembly.

[0028] 3. The high-pressure fluid at the inlet of the spool of the proportional pilot valve is introduced into the small end of the push rod through the flow passage, so that the hydraulic pressure of the proportional pilot valve spool is balanced. The push rod and the push rod guide sleeve use clearance seals, reducing the frictional force between their relative movements and significantly reducing the thrust for the push rod to control the movement of the spool.

[0029] 4. By connecting the proportional electromagnet and the first aligning ball through a lever, the thrust exerted by the proportional electromagnet on the spool of the proportional pilot valve can be significantly increased.

[0030] 5. The axes of the main valve assembly and the check valve assembly are on the same axis, making the structures of the main valve assembly and the check valve assembly compact and facilitating the installation and part replacement of the main valve assembly or the check valve assembly.

[0031] 6. The main valve assembly, the check valve assembly, the proportional pilot valve assembly, the mechanical pilot valve assembly and the sensor assembly all adopt modular design, significantly improving the interchangeability. Description of the Drawings

[0032] In order to more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the background technology and the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0033] Figure 1 It is a schematic structural diagram of an ultra-high pressure proportional unloading valve for an emulsion pump station provided by an embodiment of the present invention;

[0034] Figure 2 It is a cross-sectional view of an ultra-high pressure proportional unloading valve for an emulsion pump station provided by an embodiment of the present invention;

[0035] Figure 3 It is a cross-sectional view of the proportional pilot valve assembly of an ultra-high pressure proportional unloading valve for an emulsion pump station provided by an embodiment of the present invention. Detailed Embodiments

[0036] The following will further describe the present invention in detail with reference to the drawings.

[0037] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] Please refer to Figures 1 to 3 As shown, this embodiment provides an ultra-high pressure proportional unloading valve for an emulsion pump station, which includes a proportional unloading valve assembly 1, a mechanical pilot valve assembly 2, a sensor assembly 3, and a proportional pilot valve assembly 5, wherein: the inlet of the proportional unloading valve assembly 1 is connected to the emulsion pump station, the outlet of the proportional unloading valve assembly 1 is connected to a hydraulic support, and the outlet of the proportional unloading valve assembly 1 is connected to the liquid tank of the pump station system; the mechanical pilot valve assembly 2 is arranged on one side of the proportional unloading valve assembly 1 along the first horizontal direction, the proportional pilot valve assembly 5 is arranged on the other side of the proportional unloading valve assembly 1 along the first horizontal direction, the sensor assembly 3 is arranged on the top of the proportional unloading valve assembly 1, and the proportional unloading valve assembly 1 is configured to boost the high-pressure liquid flowing out of the outlet of the emulsion pump station, and then supply the boosted high-pressure liquid to the hydraulic support; the proportional pilot valve assembly 5 is configured to unload the high-pressure liquid passing through the proportional unloading valve assembly 1.

[0039] Specifically, the first horizontal direction is the x direction in the figure.

[0040] As an implementation manner, the proportional unloading valve assembly 1 includes a first housing 8, a main valve assembly, and a check valve assembly. The sensor assembly 3 is arranged on the top of the first housing 8, the main valve assembly is arranged at the inner top end of the first housing 8, and the check valve assembly is arranged below the main valve assembly. In the boosting state, the proportional pilot valve assembly 5 and the mechanical pilot valve assembly 2 are closed, and the high-pressure liquid at the outlet of the emulsion pump station flows into the proportional unloading valve assembly 1 through the inlet, passes through the main valve assembly, the check valve assembly is opened under the action of the liquid pressure, and finally flows through the outlet of the check valve assembly to supply liquid to the hydraulic support.

[0041] Specifically, both the one-way valve assembly and the main valve assembly are arranged in the first housing 8, and the main valve assembly and the one-way valve assembly are located on the same axis and are independent of each other.

[0042] Specifically, the first housing 8 is provided with an inlet of the proportional unloading valve assembly 1, an outlet of the proportional unloading valve assembly 1, and an outlet of the one-way valve assembly. The inlet of the proportional unloading valve assembly 1 is connected to the outlet of the emulsion pump station, the outlet of the proportional unloading valve assembly 1 is connected to the liquid tank of the pump station system, and the outlet of the one-way valve assembly is connected to the hydraulic support.

[0043] It can be seen that the main valve assembly and the one-way valve assembly have great independence, which is convenient for the installation and part replacement of the main valve assembly or the one-way valve assembly.

[0044] As an implementation manner, the main valve assembly includes a main valve spring 15, a main valve seat 16, and a main valve spool 17. The main valve seat 16 is fixedly installed at the top of the first housing 8, the main valve spool 17 is nested on the main valve seat 16, and the main valve spring 15 is arranged on the main valve spool 17.

[0045] Specifically, the valve body hole where the main valve assembly is located is a through hole with the same diameter. During the installation and disassembly of the main valve assembly, it can be assembled and disassembled from both ends of the valve body assembly.

[0046] As an implementation manner, the one-way valve assembly includes a one-way valve spool 18, a one-way valve spring 19, a one-way valve seat 20, and a one-way valve plug 21. The one-way valve plug 21 is arranged at the bottom end of the first housing 8, the one-way valve spring 19 is arranged at the bottom of the first housing 8, and one end of the one-way valve spring 19 abuts against the one-way valve plug 21. The one-way valve spool 18 is sleeved on the spring, and the one-way valve seat 20 is sleeved on the one-way valve spool 18.

[0047] Specifically, the main valve plug and the one-way valve plug are connected to the first housing 8 by threads.

[0048] Specifically, the structures and dimensional heights of the one-way valve spool and the main valve spool are similar.

[0049] As an implementation manner, the proportional pilot valve assembly 5 includes a second housing 32, a pilot valve process plug 31, a proportional pilot valve seat 33, a proportional pilot valve plug 34, a proportional pilot valve spring 35, a proportional pilot valve spring seat 36, a proportional pilot valve ball spool 37, a valve seat large hole 38, a push rod 39, a push rod guide sleeve 40 and a lever assembly. The second housing 32 is disposed on the side wall of the proportional unloading valve assembly 1. The proportional pilot valve plug 34 is disposed at the first end of the second housing 32 along the second horizontal direction. The first horizontal direction and the second horizontal direction are perpendicular to each other. A receiving hole is formed in the proportional pilot valve plug 34. The proportional pilot valve spring 35 is disposed in the receiving hole. The proportional pilot valve spring seat 36 is disposed at the opening of the receiving hole. One end of the proportional pilot valve spring 35 abuts against the inner wall of the receiving hole, and the other end of the proportional pilot valve spring 35 abuts against the first side of the proportional pilot valve spring seat 36 along the first horizontal direction. The proportional pilot valve seat 33 is disposed on the second side of the proportional pilot valve spring seat 36 along the first horizontal direction. The proportional pilot valve ball spool 37 is disposed on the proportional pilot valve seat 33. The proportional pilot valve ball spool 37 abuts against one end of the push rod 39. The push rod guide sleeve 40 is sleeved on the push rod 39. The pilot valve process plug 31 is disposed at the second end of the second housing 32 along the second horizontal direction. The second end of the second housing 32 along the second horizontal direction is connected to the lever assembly.

[0050] Specifically, the second horizontal direction is the y direction in the figure.

[0051] Specifically, the valve seat large hole 38 is formed inside the second housing 32.

[0052] Specifically, a compression nut 30 is disposed between the second housing 32 and the lever assembly.

[0053] As an implementation manner, the lever assembly includes a first lever mechanism housing 43, a second lever mechanism housing 44, an eddy current sensor measured end cover 45, a first aligning ball 29, an upper end cover 27, a lever 28, a second aligning ball 26, an eddy current sensor connecting rod 23, a lever sliding shaft 24, an electromagnet connecting block 25, a proportional electromagnet 22, an internal hexagonal bolt 46, a hexagonal nut 47, a lever screw 42, and a proportional pilot valve eddy current displacement sensor 6. The first end of the first lever mechanism housing 43 in the second horizontal direction is connected to the second housing 32, and the second end of the first lever mechanism housing 43 in the second horizontal direction is connected to the second lever mechanism housing 44. The eddy current sensor measured end cover 45 is fixed on the second lever mechanism housing 44 through the internal hexagonal bolt 46. The upper end cover 27 is arranged at one end of the first lever mechanism housing 43 in the first horizontal direction. The first aligning ball 29 is arranged between the first lever mechanism housing 43 and the second housing 32. The lever screw 42 is arranged inside the first lever mechanism housing 43. One end of the lever screw 42 is close to the first aligning ball 29, and the other end of the lever screw 42 is fixedly installed on one side of the lever 28 in the second horizontal direction. The other side of the lever 28 in the second horizontal direction is movably installed at one end of the eddy current sensor connecting rod 23 through the lever sliding shaft 24. The other end of the eddy current sensor connecting rod 23 is connected to the proportional pilot valve eddy current displacement sensor 6. The proportional pilot valve eddy current displacement sensor 6 is fixed on the second lever mechanism housing 44 through the hexagonal nut 47. The second end of the first lever mechanism housing 43 in the second horizontal direction is also connected to a proportional electromagnet 22 through the electromagnet connecting block 25. A second aligning ball 26 is arranged between the proportional electromagnet 22 and the first lever mechanism housing 43. One end of the second aligning ball 26 abuts against the proportional electromagnet 22, and the other end of the second aligning ball 26 abuts against the lever 28.

[0054] Specifically, the lever sliding shaft 24 is arranged at the small end of the lever 28.

[0055] Specifically, a lever shaft 41 is also arranged at the small end of the lever 28.

[0056] Specifically, the second aligning ball 26 abuts against the large end of the lever 28.

[0057] Specifically, the valve opening of the proportional pilot valve assembly 5 can be controlled by the proportional electromagnet 22, so as to control the pressure in the inlet chamber of the proportional pilot valve assembly 5 and the flow rate through the valve orifice of the proportional pilot valve assembly 5.

[0058] Specifically, the supply voltage and current of the proportional solenoid 22 need to meet the requirements of intrinsically safe type. Therefore, the thrust of the proportional solenoid 22 is greatly limited, and it is difficult to effectively control the proportional pilot valve assembly 5 under high-pressure environment. For the above reasons, the force-bearing area of the sealing ring at the large end of the push rod 39 is the same as the force-bearing area of the valve port, the force-bearing area of the sealing ring at the small end of the push rod 39 is the same as the force-bearing area of the sealing ring at the small end of the proportional pilot valve spool, and the inlet cavity of the proportional pilot valve assembly 5 is communicated with the sealing cavity of the push rod 39, and the pressures at the two positions are the same, so that the proportional pilot valve spool is in a hydraulic pressure balance state. Therefore, the thrust of the proportional solenoid 22 only needs to balance the force of the proportional pilot valve spring 35. At the same time, the proportional solenoid 22 and the push rod 39 are connected by a lever 28 and a first aligning ball 29, which can significantly increase the thrust of the proportional solenoid 22 on the proportional pilot valve spool.

[0059] Specifically, the proportional pilot valve eddy current displacement sensor 6 and the proportional solenoid 22 are arranged in parallel. In order to ensure that the displacement proportional pilot valve eddy current displacement sensor 6 can detect the movement of the proportional solenoid 22 in real time, the lever 28 and the end cover 45 to be measured by the displacement sensor are fixedly connected by an eddy current sensor connecting rod 23, and the end cover 45 to be measured by the displacement sensor moves forcibly with the movement of the iron core of the proportional solenoid 22. The displacement of the end cover 45 to be measured by the displacement sensor is monitored by the displacement proportional pilot valve eddy current displacement sensor 6, that is, the displacement of the iron core of the proportional solenoid 22 is monitored.

[0060] As an implementation manner, the proportional pilot valve assembly 5 further includes a pilot valve liquid distribution plate 4 and a filter 7. The pilot valve liquid distribution plate 4 is arranged between the proportional pilot valve assembly 5 and the proportional unloading valve assembly 1, and the filter 7 is arranged at the bottom of the proportional pilot valve assembly 5.

[0061] Specifically, the proportional pilot valve assembly 5 is connected to the proportional unloading valve assembly 1 through the pilot valve liquid distribution plate 4.

[0062] Specifically, a side end cover 27 is installed at the upper end of the outer cover 43 of the first lever mechanism of the proportional pilot valve assembly 5, which is convenient for observing and maintaining the lever 28.

[0063] As an implementation manner, the sensor assembly 3 includes a main valve displacement measured rod 13, a displacement sensor mounting block 14, a main valve eddy current displacement sensor 10, a sensor rod bushing 11, a sensor end cover 12, and a sensor adjusting nut 9. The displacement sensor mounting block 14 is installed at the top of the first housing 8. The first end of the main valve displacement measured rod 13 passes through the displacement sensor mounting block 14 and is threadedly connected to the main valve spool 17. The second end of the main valve displacement measured rod 13 is fixedly connected to the sensor end cover 12 by threading. The sensor rod bushing 11 is arranged on the displacement sensor mounting block 14. The main valve eddy current displacement sensor 10 is installed on the sensor rod bushing 11 through an adjusting nut. The main valve eddy current displacement sensor 10 is configured to monitor the displacement of the sensor end cover 12, and thus detect the displacement of the main valve spool 17.

[0064] Specifically, to improve interchangeability, the main valve assembly, the check valve assembly, the proportional pilot valve assembly 5, the mechanical pilot valve assembly 2, and the sensor assembly 3 all adopt modular design.

[0065] As an implementation manner, the inlet chamber of the proportional unloading valve assembly 5 is connected to the outlet of the emulsion pump station, the outlet chamber of the proportional unloading valve assembly 5 is connected to the emulsion tank, and the outlet chamber of the check valve assembly is connected to the working face.

[0066] As an implementation manner, the setting pressure of the mechanical pilot valve assembly 2 is greater than the setting pressure of the proportional pilot valve assembly 5.

[0067] The specific working principle of the above-mentioned ultra-high pressure proportional unloading valve for an emulsion pump station is as follows:

[0068] The emulsion pump station supplies liquid to the fully-mechanized mining face. When the emulsion pump station is in the loading state, the proportional pilot valve assembly 5 is in the closed state. Therefore, the main valve assembly is also in the closed state. When the pressure of the fully-mechanized mining face exceeds the set unloading pressure, the proportional electromagnet 22 on the proportional pilot valve assembly 5 receives a signal and will push the proportional pilot valve ball spool 37 to open according to a predetermined gradient and law, so that the pressure in the inlet chamber of the proportional pilot valve assembly 5, that is, the pressure in the upper chamber of the main valve assembly, decreases, and then controls the main valve assembly to open stably and quickly as well. The opening speed of the valve port can be controlled by the proportional pilot valve assembly 5 according to the pressure changes at each position. In a very short time, the proportional pilot valve assembly 5 is fully opened, so that the main valve assembly is fully opened, and finally the pump station is fully unloaded.

[0069] When the emulsion pump station is in the unloading state, due to the existence of the check valve assembly, the fully-mechanized coal face is still in a high-pressure state. However, due to reasons such as the movement of equipment such as hydraulic supports or leaks in the hydraulic circuit, the pressure of the fully-mechanized coal face will decrease. When the pressure of the fully-mechanized coal face drops below the set unloading stop pressure, the proportional solenoid 22 on the proportional pilot valve assembly 5 receives a signal and will control the proportional pilot valve spool to close according to a predetermined gradient and law.

[0070] In the embodiments disclosed in the present invention, terms such as "installation", "connection", "linkage", "fixation" and the like shall be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection or an integral connection; "linkage" may be a direct linkage or an indirect linkage through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention may be understood according to specific circumstances.

[0071] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above examples. Without departing from the spirit and scope of the present invention, the present invention has various changes and modifications, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An ultra-high pressure proportional unloading valve for an emulsion pump station, characterized in that: The ultra-high pressure proportional unloading valve for the emulsion pump station comprises a proportional unloading valve assembly, a mechanical pilot valve assembly, a proportional pilot valve assembly and a sensor assembly, wherein: The inlet of the proportional unloading valve assembly is connected to the emulsion pump station, the outlet of the proportional unloading valve assembly is connected to the hydraulic support, and the outlet of the proportional unloading valve assembly is connected to the liquid tank of the pump station system; The mechanical pilot valve assembly is arranged on one side of the proportional unloading valve assembly along the first horizontal direction, the proportional pilot valve assembly is arranged on the other side of the proportional unloading valve assembly along the first horizontal direction, and the sensor assembly is arranged on the top of the proportional unloading valve assembly. The proportional unloading valve assembly is configured to pressurize the high-pressure liquid flowing out of the outlet of the emulsion pump station, and then supply the pressurized high-pressure liquid to the hydraulic support; The proportional pilot valve assembly is configured to unload the high-pressure fluid passing through the proportional unloading valve assembly.

2. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 1, characterized in that: The proportional unloading valve assembly comprises a first housing, a main valve assembly and a one-way valve assembly, wherein the sensor assembly is arranged at the top of the first housing, the main valve assembly is arranged at the inner top end of the first housing, and the one-way valve assembly is arranged below the main valve assembly. In the boosted state, the proportional pilot valve assembly and the mechanical pilot valve assembly are closed, and the high-pressure liquid at the outlet of the emulsion pump station flows from the inlet of the proportional unloading valve assembly through the main valve assembly. The one-way valve assembly is opened by the liquid pressure and finally flows to the hydraulic support through the outlet of the one-way valve assembly to supply liquid.

3. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 2, characterized in that: The main valve assembly comprises a main valve spring, a main valve seat and a main valve core. The main valve seat is fixedly mounted on the top of the first housing, the main valve core is nested on the main valve seat, and the main valve spring is arranged on the main valve core.

4. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 2, characterized in that: The one-way valve assembly includes a one-way valve core, a one-way valve spring, a one-way valve seat and a one-way valve plug. The one-way valve plug is arranged at the bottom end of the first shell, the one-way valve spring is arranged at the bottom of the first shell, and one end of the one-way valve spring abuts against the one-way valve plug, the one-way valve core is sleeved on the spring, and the one-way valve seat is sleeved on the one-way valve core.

5. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 1, characterized in that: The proportional pilot valve assembly includes a second housing, a pilot valve process plug, a proportional pilot valve seat, a proportional pilot valve plug, a proportional pilot valve spring, a proportional pilot valve spring seat, a proportional pilot valve ball valve core, a valve seat large hole, a push rod, a push rod guide sleeve and a lever assembly. The second housing is arranged on the side wall of the proportional unloading valve assembly, the proportional pilot valve plug is arranged at the first end of the second housing along the second horizontal direction, the first horizontal direction and the second horizontal direction are perpendicular to each other, an accommodating hole is opened on the proportional pilot valve plug, the proportional pilot valve spring is arranged in the accommodating hole, and the proportional pilot valve spring seat is arranged at the opening of the accommodating hole One end of the proportional pilot valve spring abuts against the inner wall of the accommodating hole, the other end of the proportional pilot valve spring abuts against the first side of the proportional pilot valve spring seat along the first horizontal direction, the proportional pilot valve seat is arranged on the second side of the proportional pilot valve spring seat along the first horizontal direction, the proportional pilot valve seat is provided with the proportional pilot valve ball valve core, the proportional pilot valve ball valve core abuts against one end of the push rod, the push rod guide sleeve is arranged on the push rod, the pilot valve process plug is arranged at the second end of the second shell along the second horizontal direction, and the second end of the second shell along the second horizontal direction is connected to the lever assembly.

6. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 5, characterized in that: The lever assembly includes a first lever mechanism outer cover, a second lever mechanism outer cover, a measured end cover of the eddy current sensor, a first self-aligning ball, an upper end cover, a lever, a second self-aligning ball, an eddy current sensor connecting rod, a lever sliding shaft, an electromagnet connecting block, a proportional electromagnet, a hexagon socket bolt, a hexagon nut, a lever screw and a proportional pilot valve eddy current displacement sensor, the first lever mechanism outer cover is connected to the second housing at a first end along the second horizontal direction, the first lever mechanism outer cover is connected to the second lever mechanism outer cover at a second end along the second horizontal direction, the eddy current sensor measured end cover is fixed to the second lever mechanism outer cover by the hexagon socket bolt, and the upper end cover is arranged at one end of the first lever mechanism outer cover along the first horizontal direction; The first self-aligning ball is arranged between the first lever mechanism outer cover and the second shell, the lever screw is arranged inside the first lever mechanism outer cover, one end of the lever screw is close to the first self-aligning ball, the other end of the lever screw is fixedly mounted on one side of the lever along the second horizontal direction, the other side of the lever along the second horizontal direction is movably mounted on one end of the eddy current sensor connecting rod through a lever sliding shaft, the other end of the eddy current sensor connecting rod is connected to the proportional pilot valve eddy current displacement sensor, and the proportional pilot valve eddy current displacement sensor is fixed to the second lever mechanism outer cover through the hexagonal nut; The second end of the first lever mechanism outer cover along the second horizontal direction is also connected to the proportional electromagnet through the electromagnet connecting block, and the second centering ball is arranged between the proportional electromagnet and the first lever mechanism outer cover, one end of the second centering ball abuts the proportional electromagnet, and the other end of the second centering ball abuts the lever.

7. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 1, characterized in that: The proportional pilot valve assembly further comprises a pilot valve liquid distribution plate and a filter. The pilot valve liquid distribution plate is arranged between the proportional pilot valve assembly and the proportional unloading valve assembly, and the filter is arranged at the bottom of the proportional pilot valve assembly.

8. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 3, characterized in that: The sensor assembly includes a main valve displacement measured rod, a displacement sensor mounting block, a main valve eddy current displacement sensor, a sensor rod pressing sleeve, a sensor end cover and a sensor adjusting nut. The displacement sensor mounting block is installed at the top of the first housing. The first end of the main valve displacement measured rod passes through the displacement sensor mounting block and is threadedly connected to the main valve spool. The second end of the main valve displacement measured rod is fixedly connected to the sensor end cover by threads. The sensor rod pressing sleeve is arranged on the displacement sensor mounting block. The main valve eddy current displacement sensor is installed on the sensor rod pressing sleeve through an adjusting nut. The main valve eddy current displacement sensor is configured to monitor the displacement of the sensor end cover, and then detect the displacement of the main valve spool.

9. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 4, characterized in that: The inlet chamber of the proportional unloading valve assembly is connected to the outlet of the emulsion pump station, the outlet chamber of the proportional unloading valve assembly is connected to the emulsion tank, and the outlet chamber of the one-way valve assembly is connected to the working surface.

10. The ultra-high pressure proportional unloading valve for an emulsion pump station according to claim 1, characterized in that: The set pressure of the mechanical pilot valve assembly is greater than the set pressure of the proportional pilot valve assembly.

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