CN1811202A - Electrohydraulic unloading valve with both hydraulic control mode and electrohydraulic control mode - Google Patents
Electrohydraulic unloading valve with both hydraulic control mode and electrohydraulic control mode Download PDFInfo
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- CN1811202A CN1811202A CN 200610038256 CN200610038256A CN1811202A CN 1811202 A CN1811202 A CN 1811202A CN 200610038256 CN200610038256 CN 200610038256 CN 200610038256 A CN200610038256 A CN 200610038256A CN 1811202 A CN1811202 A CN 1811202A
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- 239000000839 emulsion Substances 0.000 abstract description 14
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- 238000005065 mining Methods 0.000 abstract description 7
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Abstract
本发明具有液控、电液控两种工作方式的电液卸载阀，它主要由主阀体、先导阀和过滤器构成，主阀体上设有单向阀组、主阀组和推力活塞，还设有蓄能器接头、高压出液接头、卸载回液接头和电磁阀，先导阀体底部设有与其液路相通的电液切换阀。当工作面支架用液时，乳化液泵能够通过该阀向支架输送高压乳化液；当工作面支架停止工作时，实现乳化液泵卸载运行两种功能。两种控制方式可独立运行，能在配有智能化无人监控系统的综采工作面使用，也可在普通综采工作面使用，扩大了设备的使用范围。当电液控方式出现故障时，还可切换为液控方式工作，提高了设备的可靠性，其结构紧凑、简洁，操作简单，使用方便，具有广泛的实用性。
The invention has an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control. It is mainly composed of a main valve body, a pilot valve and a filter. The main valve body is provided with a one-way valve group, a main valve group and a thrust piston. , There are also accumulator joints, high-pressure liquid outlet joints, unloading liquid return joints and solenoid valves. The bottom of the pilot valve body is equipped with an electro-hydraulic switching valve connected to its liquid circuit. When the support of the working face is in use, the emulsion pump can deliver high-pressure emulsion to the support through the valve; when the support of the working face stops working, the two functions of unloading and running of the emulsion pump can be realized. The two control methods can operate independently, and can be used in fully-mechanized mining working faces equipped with intelligent unmanned monitoring systems, and can also be used in ordinary fully-mechanized mining working faces, which expands the scope of use of the equipment. When the electro-hydraulic control mode fails, it can also switch to the hydraulic control mode, which improves the reliability of the equipment. Its structure is compact, simple, easy to operate, easy to use, and has a wide range of practicability.
Description
一、技术领域1. Technical field
本发明涉及具有液控、电液控两种工作方式的电液卸载阀，尤其适用于煤矿综采工作面乳化液泵的智能监控自动卸载。The invention relates to an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control, and is especially suitable for intelligent monitoring and automatic unloading of emulsion pumps in fully mechanized mining working faces of coal mines.
二、背景技术2. Background technology
目前国产的乳化液泵站由于未配备智能监控系统，乳化液泵上关键的压力控制元件——卸载阀全部采用液控工作方式，无电液控工作方式，而要实现乳化液泵站液压系统的自动化控制，必须具有液控、电液控两种工作方式的卸载阀——电液卸载阀，因此设计一种具有液控、电液控两种工作方式的电液卸载阀是一急待解决的问题，也是煤矿综采工作面实现智能监控的需要。At present, the domestic emulsion pump station is not equipped with an intelligent monitoring system, and the key pressure control element on the emulsion pump—the unloading valve all adopts the hydraulic control working mode, and there is no electric hydraulic control working mode, but to realize the hydraulic system of the emulsion pump station It is necessary to have an unloading valve with two working modes of hydraulic control and electro-hydraulic control—electro-hydraulic unloading valve. Therefore, it is urgent to design an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control. The problem to be solved is also the need for intelligent monitoring of fully mechanized coal mining face.
三、发明内容3. Contents of the invention
技术问题：本发明的目的是提供一种结构紧凑、性能可靠、具有液控、电液控两种工作方式的电液卸载阀。Technical problem: The purpose of this invention is to provide an electro-hydraulic unloading valve with compact structure, reliable performance, and two working modes of hydraulic control and electro-hydraulic control.
技术方案：本发明具有液控、电液控两种工作方式的电液卸载阀，它主要由主阀体，与主阀体相连接的先导阀和过滤器构成，主阀体内设有顺序组合在一起的单向阀组、主阀组和推力活塞，并设有与各阀组液路相通的进液口，高压出液腔和卸载回液腔，主阀体一侧面上设有与单向阀组高压出液腔相通的蓄能器接头，另一侧面上方设有与高压出液腔相通的高压出液接头，下方设有与卸载回液腔相通的卸载回液接头；主阀体和先导阀体上分别设有相互连通的多个控制液路，先导阀体的外侧设有分别与过滤器相通的进液液路A和出液液路G，另一侧设有电磁阀，先导阀体底部设有与其液路相通的电液切换阀，过滤器设在先导阀体的侧下方。Technical solution: The present invention has an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control. It is mainly composed of a main valve body, a pilot valve connected with the main valve body and a filter. The main valve body is equipped with a sequential combination The one-way valve group, the main valve group and the thrust piston are connected together, and are provided with a liquid inlet connected to the liquid circuit of each valve group, a high-pressure liquid outlet chamber and an unloading liquid return chamber. One side of the main valve body is provided with a single The accumulator joint communicates with the high-pressure liquid outlet chamber of the valve group, the upper side of the other side is provided with a high-pressure liquid outlet joint communicated with the high-pressure liquid outlet chamber, and the lower part is provided with an unloading liquid return joint communicated with the unloading liquid return chamber; the main valve body There are multiple control fluid circuits communicating with each other on the pilot valve body. The outer side of the pilot valve body is provided with the inlet liquid circuit A and the liquid outlet liquid circuit G respectively connected with the filter, and the other side is provided with a solenoid valve. The bottom of the pilot valve body is provided with an electro-hydraulic switching valve connected with its liquid path, and the filter is arranged under the side of the pilot valve body.
本发明具有液控、电液控两种工作方式的电液卸载阀，所述电液切换阀为两位四通切换阀，它由顶杆I、钢球I、阀座I、顶杆II、阀座II、钢球II和弹簧顺序组合而成，其端头设有切换螺钉和由螺钉固定的端盖；所述电液切换阀上依次设有与先导阀体底部四个液路对应的S1、B1、A1、P1四个液路。所述主阀体和先导阀体相互连通的多个控制液路分别为S、B、P、K、L液路，S液路上部与高压出液腔相通，下部与S1相通；B液路与B1液路相通；P液路与K、A液路相通；G液路与P1液路相通；A1液路与电磁阀进液液路相通；电磁阀的回液液路与L液路相通；L液路的上部与卸载回液腔相通。The present invention has electro-hydraulic unloading valves with two working modes of hydraulic control and electro-hydraulic control. , valve seat II, steel ball II and spring are sequentially combined, and its end is provided with a switching screw and an end cover fixed by the screw; S 1 , B 1 , A 1 , P 1 four fluid circuits. The multiple control fluid paths connected to each other between the main valve body and the pilot valve body are respectively S, B, P, K, and L fluid paths. The liquid path of P is connected with the liquid path of K and A; the liquid path of G is connected with the liquid path of P 1 ; the liquid path of A 1 is connected with the liquid inlet liquid path of the solenoid valve; the return liquid path of the solenoid valve is connected with the The L liquid path communicates; the upper part of the L liquid path communicates with the unloading liquid return cavity.
技术效果：本发明具有液控、电液控两种工作方式的电液卸载阀，最适用于煤矿综采工作面乳化液泵的智能监控自动卸载，采用在主阀体上设置单向阀组、主阀组、推力活塞、先导阀体、电磁阀、两位四通切换阀、过滤器和先导阀组，无论是在液控还是在电液控工作方式下，都能实现：①当工作面支架用液时，乳化液泵能够通过该阀向支架输送高压乳化液；②当工作面支架停止工作时，实现乳化液泵卸载运行两种功能。两种控制方式的独立运行，可使乳化液泵既能在配有智能化无人监控系统的综采工作面使用，也可在普通综采工作面使用，扩大了设备的使用范围；同时在电液控方式出现故障时，还可以切换到液控方式下工作，提高了设备的可靠性。两种工作方式通过一个两位四通切换阀，即可方便地进行切换。各元部件位置安装合理，各控制液路的沟通，均在主阀体、先导阀体内部，其结构紧凑、简洁，操作简单，使用方便，大大提高了设备的运行可靠性及选用范围，具有广泛的实用性。Technical effect: The present invention has an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control, which is most suitable for intelligent monitoring and automatic unloading of emulsion pumps in fully mechanized mining working faces in coal mines. A one-way valve group is installed on the main valve body , main valve group, thrust piston, pilot valve body, solenoid valve, two-position four-way switching valve, filter and pilot valve group, whether in hydraulic control or electro-hydraulic control mode, can achieve: ①When working The emulsion pump can deliver high-pressure emulsion to the support through the valve when the support of the working face is used for liquid; ② When the support of the working face stops working, the two functions of unloading and running of the emulsion pump can be realized. The independent operation of the two control methods enables the emulsion pump to be used not only in the fully mechanized mining face equipped with an intelligent unmanned monitoring system, but also in the ordinary fully mechanized mining face, which expands the scope of use of the equipment; When the electro-hydraulic control mode fails, it can also switch to the hydraulic control mode to work, which improves the reliability of the equipment. The two working modes can be conveniently switched through a two-position four-way switching valve. The location of each component is reasonably installed, and the communication of each control fluid circuit is inside the main valve body and the pilot valve body. Its structure is compact and simple, and it is easy to operate and easy to use, which greatly improves the operation reliability and selection range of the equipment. Broad usability.
四、附图说明4. Description of drawings
图1是本发明结构主视图。Fig. 1 is a front view of the structure of the present invention.
图2是本发明结构侧视图。Fig. 2 is a side view of the structure of the present invention.
图3是图1的A-A剖视图。Fig. 3 is a sectional view along line A-A of Fig. 1 .
图中：1单向阀组，2主阀体，3蓄能器接头，4高压出液接头，5卸载回液接头，6电磁阀，7主阀组，8推力活塞，9切换阀，10过滤器，11先导阀体，12先导阀芯，13调压弹簧，14调压螺堵，15切换螺钉，16顶杆I，17钢球1，18阀座I，19顶杆II，20阀座II，21钢球II，22弹簧，23活塞铜套，24端盖，25高压出液腔，26进液口，27卸载回液腔。In the figure: 1 one-way valve group, 2 main valve body, 3 accumulator connector, 4 high pressure outlet connector, 5 unloading liquid return connector, 6 solenoid valve, 7 main valve group, 8 thrust piston, 9 switching valve, 10 Filter, 11 pilot valve body, 12 pilot spool, 13 pressure regulating spring, 14 pressure regulating screw plug, 15 switching screw, 16 ejector rod I, 17 steel ball 1, 18 valve seat I, 19 ejector rod II, 20 valve Seat II, 21 steel ball II, 22 springs, 23 piston copper sleeves, 24 end caps, 25 high-pressure liquid outlet chambers, 26 liquid inlets, and 27 unloading liquid return chambers.
五、具体实施方式5. Specific implementation
下面结合附图对本发明的一个实施例作进一步的描述：An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
本发明具有液控、电液控两种工作方式的电液卸载阀，它主要由主阀体2、先导阀11和过滤器10构成，主阀体2中并列安装了两组单向阀组1、主阀组7、推力活塞8，并设有与各阀组液路相通的进液口26，蓄能器接头3安装于主阀体2端部，与高压出液腔25相通，两个高压出液接头4安装于主阀体2的上方，卸载回液接头5安装于主阀体2下方；与卸载阀回液腔27相通，先导阀体11安装于主阀体2的另一个端面上，先导阀芯12、活塞铜套23安装于先导阀体1内部，调压弹簧13、调压螺堵14安装于先导阀芯12的上部。过滤器10安装在先导阀体11一侧下方，先导阀体11上设有分别与过滤器10相通的进液液路为A，出液液路为G；先导阀体11的另一侧装有电磁阀6，底部装有两位四通切换阀9。在两位四通切换阀9的内部装有切换螺钉15、顶杆I16、钢球I17、阀座I18、顶杆II19、阀座II20、钢球II21、弹簧22，端部装有端盖24，两位四通电液切换阀9上部依次设有S1、B1、A1、P1四个液路，与先导阀体11底部四个液路对应。在主阀体2、先导阀体11上还开有S、B、P、K、L控制液路，S液路上部与高压出液腔相通，下部与S1相通；B液路与B1液路相通；P液路与K、A液路相通；G液路与P1液路相通；A1液路与电磁阀6进液液路相通；电磁阀6的回液液路与L液路相通；L液路的上部与卸载回液腔相通。通过电液切换阀9可完成相互独立的两种工作方式，只需打开端盖24，调整切换螺钉15的位置即可实现，方便快捷，两种工作过程如下：The invention has an electro-hydraulic unloading valve with two working modes of hydraulic control and electro-hydraulic control. It is mainly composed of a main valve body 2, a pilot valve 11 and a filter 10. Two sets of one-way valve groups are installed side by side in the main valve body 2. 1. The main valve group 7 and the thrust piston 8 are provided with a liquid inlet 26 connected with the liquid path of each valve group. The accumulator joint 3 is installed at the end of the main valve body 2 and communicated with the high-pressure liquid outlet chamber 25. A high-pressure liquid outlet joint 4 is installed above the main valve body 2, and an unloading liquid return joint 5 is installed below the main valve body 2; On the end face, the pilot spool 12 and the copper piston sleeve 23 are installed inside the pilot valve body 1 , and the pressure regulating spring 13 and the pressure regulating screw plug 14 are installed on the upper part of the pilot spool 12 . The filter 10 is installed under one side of the pilot valve body 11, and the pilot valve body 11 is provided with the inlet liquid path A and the liquid outlet path G respectively connected with the filter 10; the other side of the pilot valve body 11 is installed Electromagnetic valve 6 is arranged, and two-position four-way switching valve 9 is equipped with at the bottom. Switching screw 15, ejector rod I16, steel ball I17, valve seat I18, ejector rod II19, valve seat II20, steel ball II21, spring 22 are installed inside the two-position four-way switching valve 9, and end cap 24 is installed at the end , the upper part of the two-position four-way electro-hydraulic switching valve 9 is provided with four liquid circuits S 1 , B 1 , A 1 , and P 1 in sequence, corresponding to the four liquid circuits at the bottom of the pilot valve body 11 . On the main valve body 2 and pilot valve body 11, there are S, B, P, K, and L control fluid circuits. The upper part of the S liquid circuit communicates with the high-pressure outlet chamber, and the lower part communicates with S1 ; the B liquid circuit communicates with B1 The liquid path is connected; the liquid path of P is connected with the liquid path of K and A; the liquid path of G is connected with the liquid path of P1 ; the liquid path of A1 is connected with the inlet liquid path of solenoid valve 6; The upper part of the L liquid path communicates with the unloading liquid return chamber. Through the electro-hydraulic switching valve 9, two independent working modes can be completed, which can be realized by simply opening the end cover 24 and adjusting the position of the switching screw 15, which is convenient and quick. The two working processes are as follows:
1)液控工作方式：打开端盖24，拧紧切换螺钉15，顶杆I16、钢球I17、顶杆II19、钢球II21向左移动，钢球I17与阀座I 18阀面关闭，A1与P1液路断开；钢球II21与阀座II20阀面打开，S1与B1液路相通，电液卸载阀上液控液路中液体流向由S→S1→B1→B，S与B相通，先导阀芯12起作用，而电液控液路液体流向由P→A→G→P1，之后断开，电磁阀6失去作用，从而电液控工作方式失效，液控工作方式起作用。当支架用液时，高压液体冲开单向阀组1，通过高压出液接头4向支架供液；当支架停止用液时，高压出液控液体压力即活塞铜套23所受的压力迅速上升至卸载阀调定压力，在向上的液压力作用下，克服单簧13的向下作用力，将先导阀芯11打开，推力活塞8下腔和K液路与L液路导通，导致推力活塞8下腔迅速失去压力，主阀组7迅速打开，实现乳化液泵的卸载运行；当支架再次用液或管路泄漏使得高压出液腔的压力降低到活塞铜套23向上的液压力克服不了弹簧13的向下作用力时，先导阀芯12关闭，P液路的液体经K液路到达推力活塞8下腔，使主阀组7关闭，单向阀组1打开，立即恢复向支架供液。调整调压螺堵14即调整弹簧13的预压力，可以调整卸载阀的调定压力。1) Hydraulic control working mode: open the end cover 24, tighten the switch screw 15, the ejector rod I16, steel ball I17, ejector rod II19, steel ball II21 move to the left, the steel ball I17 and the valve seat I 18 valve surface are closed, A 1 Disconnect the liquid path from P 1 ; the steel ball II21 and the valve seat II20 open the valve surface, S 1 is connected to the B 1 liquid path, and the liquid flow in the hydraulic control liquid path on the electro-hydraulic unloading valve is from S→S 1 →B 1 →B , S and B are connected, the pilot spool 12 works, and the liquid flow in the electro-hydraulic control circuit is from P→A→G→P 1 , and then disconnected, the solenoid valve 6 loses its function, so the electro-hydraulic control working mode fails, and the hydraulic The way the control works works. When the support uses liquid, the high-pressure liquid flushes open the one-way valve group 1, and supplies liquid to the support through the high-pressure liquid outlet joint 4; Rise to the set pressure of the unloading valve, under the action of upward hydraulic pressure, overcome the downward force of the single spring 13, open the pilot valve core 11, the lower chamber of the thrust piston 8 and the K liquid circuit and the L liquid circuit conduct, resulting in The lower cavity of the thrust piston 8 loses pressure quickly, and the main valve group 7 opens quickly to realize the unloading operation of the emulsion pump; when the bracket is used again or the pipeline leaks, the pressure of the high-pressure liquid outlet cavity is reduced to the upward hydraulic pressure of the piston copper sleeve 23 When the downward force of the spring 13 cannot be overcome, the pilot valve core 12 is closed, and the liquid in the P liquid circuit reaches the lower cavity of the thrust piston 8 through the K liquid circuit, so that the main valve group 7 is closed, and the one-way valve group 1 is opened, and the direction is restored immediately. The stand supplies fluid. Adjusting the pressure regulating screw plug 14 is to adjust the pre-pressure of the spring 13 to adjust the set pressure of the unloading valve.
2)电液控工作方式：打开端盖24，拧松切换螺钉15，在液压力和弹簧22弹力作用下，顶杆I16、钢球I17、顶杆II19、钢球II21向右移动，钢球I17和阀座I18阀面打开，液路A1、P1导通，钢球II21与阀座II20阀面关闭，S1与B1液路断开，液控液路S处的液压力不能到达B液路，也即活塞铜套23失去向上的液压力，使得先导阀芯12始终处于关闭状态，即液控方式失效，而电液控液路由P→A→G→P1→A1→电磁阀6，电磁阀6起作用，实现电液控工作方式。当支架用液时，电磁阀6关闭，电液控制液路在电磁阀6之后断开，推力活塞8下腔通过P、K液路来压，在液压力作用下，使主阀组7关闭；当支架停止用液时，高压出液腔压力迅速上升至系统设定工作压力(智能监控系统中设定)，智能监控系统检测到这一压力信号后，迅速发出指令，使电磁阀6动作，电磁阀6打开，电液控制液路液体由P→A→G→P1→A1→电磁阀6→L→卸载回液腔，电液控制液路失压，使得推力活塞8下腔和液路K迅速失去液压力，主阀组7迅速打开，实现乳化液泵卸载运行；当支架再次用液或系统泄漏造成高压出液腔压力降到一定值时(智能监控系统中设定)，智能监控系统检测到这一压力后，立即发出信号，使电磁阀6动作，电磁阀6再次关闭，电液控液路在电磁阀6处再次被断开，P液路液体经K液路到达推力活塞8下腔，使主阀组7关闭，单向阀组1打开，立即恢复向支架供液。2) Electro-hydraulic control working mode: open the end cover 24, loosen the switching screw 15, under the action of the hydraulic pressure and the elastic force of the spring 22, the ejector rod I16, the steel ball I17, the ejector rod II19, and the steel ball II21 move to the right, and the steel ball The valve surface of I17 and valve seat I18 is opened, the fluid path A 1 and P 1 are connected, the steel ball II21 and the valve surface of valve seat II20 are closed, the fluid path of S 1 and B 1 is disconnected, and the hydraulic pressure at S of the hydraulic control fluid path cannot Arriving at the B hydraulic circuit, that is, the copper sleeve 23 of the piston loses the upward hydraulic pressure, so that the pilot spool 12 is always closed, that is, the hydraulic control mode fails, and the electro-hydraulic control hydraulic route P→A→G→P 1 →A 1 →Solenoid valve 6, the solenoid valve 6 works to realize the electro-hydraulic control working mode. When the bracket uses liquid, the solenoid valve 6 is closed, the electro-hydraulic control liquid circuit is disconnected behind the solenoid valve 6, and the lower cavity of the thrust piston 8 is pressed through the P and K liquid circuits, and the main valve group 7 is closed under the hydraulic pressure ; When the bracket stops using liquid, the pressure of the high-pressure liquid chamber rises rapidly to the system set working pressure (set in the intelligent monitoring system), and the intelligent monitoring system detects this pressure signal, and quickly sends out instructions to make the solenoid valve 6 act , the solenoid valve 6 is opened, the liquid in the electro-hydraulic control hydraulic circuit is from P→A→G→P 1 →A 1 →solenoid valve 6→L→unloaded back to the liquid chamber, and the electro-hydraulic control hydraulic circuit loses pressure, so that the thrust piston 8 lower chamber And the liquid circuit K loses the hydraulic pressure quickly, and the main valve group 7 opens quickly to realize the unloading operation of the emulsion pump; when the support is used again or the system leaks, the pressure of the high-pressure liquid chamber drops to a certain value (set in the intelligent monitoring system) , after the intelligent monitoring system detects this pressure, it immediately sends out a signal to make the solenoid valve 6 act, and the solenoid valve 6 is closed again. When it reaches the lower cavity of the thrust piston 8, the main valve group 7 is closed, the one-way valve group 1 is opened, and the liquid supply to the bracket is resumed immediately.
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| CNB2006100382567A CN100485196C (en) | 2006-02-11 | 2006-02-11 | Electrohydraulic unloading valve with both hydraulic control mode and electrohydraulic control mode |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234270B (en) * | 2006-11-14 | 2010-07-14 | 玛珂系统分析和开发有限公司 | filter station |
| CN101936315A (en) * | 2010-09-20 | 2011-01-05 | 竺浩君 | Zero-leakage unloading valve bank |
| CN103291680A (en) * | 2013-06-24 | 2013-09-11 | 山西平阳广日机电有限公司 | Ultra-thin type electro-hydraulic reversing valve |
| CN113417900A (en) * | 2021-06-16 | 2021-09-21 | 中国矿业大学 | Integrated high-pressure large-flow proportional overflow type unloading valve |
| CN114087249A (en) * | 2021-11-18 | 2022-02-25 | 国能神东煤炭集团有限责任公司 | Electro-hydraulic pressure control system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN85105425B (en) * | 1985-07-11 | 1987-04-22 | 浙江大学 | Three-way plug-in type electro-hydraulic proportional combination valve |
| CN1039288A (en) * | 1989-07-24 | 1990-01-31 | 权宇 | Composite control valve of pressure and flow proportional to electric current |
| DE4111537A1 (en) * | 1991-04-09 | 1992-10-15 | Rexroth Mannesmann Gmbh | Electrohydraulic pilot controlled four way directional hydraulic valve - ensures closed centre operation by spring action combined with spool ends that locate with stop shoulders contacting bushes |
| DE19724870A1 (en) * | 1997-06-12 | 1998-12-17 | Bosch Gmbh Robert | Adjustable hydraulic work machine |
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2006
- 2006-02-11 CN CNB2006100382567A patent/CN100485196C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234270B (en) * | 2006-11-14 | 2010-07-14 | 玛珂系统分析和开发有限公司 | filter station |
| CN101936315A (en) * | 2010-09-20 | 2011-01-05 | 竺浩君 | Zero-leakage unloading valve bank |
| CN101936315B (en) * | 2010-09-20 | 2013-03-13 | 竺浩君 | Zero-leakage unloading valve bank |
| CN103291680A (en) * | 2013-06-24 | 2013-09-11 | 山西平阳广日机电有限公司 | Ultra-thin type electro-hydraulic reversing valve |
| CN113417900A (en) * | 2021-06-16 | 2021-09-21 | 中国矿业大学 | Integrated high-pressure large-flow proportional overflow type unloading valve |
| CN113417900B (en) * | 2021-06-16 | 2022-04-01 | 中国矿业大学 | An integrated high-pressure large-flow proportional relief unloading valve |
| CN114087249A (en) * | 2021-11-18 | 2022-02-25 | 国能神东煤炭集团有限责任公司 | Electro-hydraulic pressure control system and control method |
| CN114087249B (en) * | 2021-11-18 | 2023-05-26 | 国能神东煤炭集团有限责任公司 | Electrohydraulic pressure control system and control method |
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| CN100485196C (en) | 2009-05-06 |
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