CN111306130A - Control system and control method for valve stand switching - Google Patents
Control system and control method for valve stand switching Download PDFInfo
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- CN111306130A CN111306130A CN202010249592.6A CN202010249592A CN111306130A CN 111306130 A CN111306130 A CN 111306130A CN 202010249592 A CN202010249592 A CN 202010249592A CN 111306130 A CN111306130 A CN 111306130A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of blast furnace stokehold control assistance, in particular to a control system for switching a valve table, which comprises: the pressure oil pipeline selects an oil way through the valve table selection block and conveys the pressure oil to the first valve table or the second valve table; the valve table selection block comprises a first electromagnetic directional valve and a second electromagnetic directional valve, the first electromagnetic directional valve is communicated with the second valve table, and the second electromagnetic directional valve is communicated with the first valve table; the first valve table is directly connected with the pressure oil pipeline through the second ball valve, and the second valve table is directly connected with the pressure oil pipeline through the fifth ball valve. By adopting the control system and the control method for switching the valve stands, the problems that when one valve stand in the double valve stands breaks down, the other valve stand is not switched timely and potential safety hazards are easily generated in the prior art are effectively solved.
Description
Technical Field
The invention relates to the technical field of blast furnace stokehole control assistance, in particular to a control system and a control method for valve table switching.
Background
The valve table is an important component of a hydraulic system in front of the blast furnace, and is used for realizing the actions of equipment such as a tapping machine, a mud gun and the like through the control of a series of hydraulic valve groups, thereby realizing the tapping and the blocking of molten iron.
Generally, in a hydraulic system, a valve stand consists of control elements, two valve stands can be in a standby state in actual production, and one of the two valve stands is prevented from being damaged, so that the safety and stability of production are avoided; when one of them valve stage broke down, still need its oil feed ball valve of manual shut, reaction time is long, is unfavorable for production safety and overhaul of the equipments.
In view of the above, there is a need to improve a valve table selection device in the prior art to solve the problem that when the valve table fails, the switching is not timely, and potential safety hazards are easily generated.
Disclosure of Invention
The invention aims to solve the problem that potential safety hazards are easily caused by untimely switching to the other valve station when one valve station in a double-valve station fails in the prior art, and provides a control system and a control method for switching the valve stations.
The technical scheme for realizing the purpose of the invention is as follows:
a control system for valve station switching, comprising:
the pressure oil pipeline selects an oil way through the valve table selection block and conveys the pressure oil to the first valve table or the second valve table;
the valve table selection block comprises a first electromagnetic directional valve and a second electromagnetic directional valve, the first electromagnetic directional valve is communicated with the second valve table, and the second electromagnetic directional valve is communicated with the first valve table;
the first valve table is directly connected with the pressure oil pipeline through the second ball valve, and the second valve table is directly connected with the pressure oil pipeline through the fifth ball valve.
Compare with prior art, the valve platform selecting arrangement of this scheme safe and reliable, select the work valve platform through the solenoid directional valve, avoid causing the maloperation, when one of them valve platform trouble, can realize the fast switch-over, guarantee that production is stable going on, when out of work, the valve platform does not have pressure oil, the staff can realize on-line maintenance, and, the valve platform selecting arrangement of this scheme still has manual bypass and selects, when two valve platforms all break down, the manual bypass of accessible carries out work, make things convenient for the staff to inspect the device.
Furthermore, the valve table selection block further comprises a first cartridge valve and a second cartridge valve, the first cartridge valve is connected with the first electromagnetic directional valve, and the second cartridge valve is connected with the second electromagnetic directional valve.
The first cartridge valve and the second cartridge valve are correspondingly installed at the positions where the first electromagnetic directional valve and the second electromagnetic directional valve are connected with the pressure oil pipeline, so that the automatic selection of the valve table selection block on the oil pipeline is realized, the electromagnetic directional valves are powered on, when one of the electromagnetic directional valves breaks down, only the electromagnetic directional valve needs to be directly switched to the other electromagnetic directional valve, the normal operation cannot be influenced, the rapid switching can be realized, and the stable production is ensured.
Further, still include first ball valve and fourth ball valve, first ball valve intercommunication first valve platform and second cartridge valve, fourth ball valve intercommunication second valve platform and first cartridge valve.
Specifically, this fourth ball valve and first ball valve all set up in the outside of valve platform selection piece, and all are in normally open state, and when first electromagnetic reversing valve or second electromagnetic reversing valve broke down, owing to cut off the power supply of the valve platform of one side of breaking down, can close fourth ball valve or first ball valve, overhauls the valve platform of one side of this trouble on line.
Further, the first ball valve and the second ball valve are communicated with the first valve table through a first main valve, and the fourth ball valve and the fifth ball valve are communicated with the second valve table through a second main valve.
Carry out the total accuse to first valve platform and second valve platform respectively through first main valve and second main valve, and first main valve and second main valve all are in normally open state, if when two sets of valve platforms of valve platform selection piece all break down, only need manually open second ball valve and fifth ball valve, close first ball valve and fourth ball valve, select the bypass to carry pressure oil, overhaul valve platform selection piece on line.
Furthermore, the pressure oil pipeline and the valve table selection block are controlled through a third ball valve.
When two groups of valve tables in the valve table selection block break down, pressure oil can be cut off to enter an oil way of the valve table selection block only by directly turning off the third ball valve, then the second ball valve and the fifth ball valve are opened, normal work of the system is guaranteed, and online maintenance can be carried out on the valve table selection block.
Furthermore, an electromagnet YA1 is arranged in the first electromagnetic directional valve, when the electromagnet YA1 is electrified, the first cartridge valve is opened, and the second cartridge valve is closed; an electromagnet YA2 is arranged in the second electromagnetic directional valve, and when the electromagnet YA2 is electrified, the second cartridge valve is opened, and the first cartridge valve is closed.
Under normal operating conditions, pressure oil enters into valve platform selection block through the third ball valve, and when the electro-magnet YA1 of first electromagnetic directional valve got to the electricity, the solenoid valve was in the left position, and first cartridge valve was opened, and pressure oil gets into the second valve platform through fourth ball valve and second main valve, and the second electromagnetic directional valve did not get to the electricity this moment, and first valve platform does not have the power supply, can realize on-line maintenance first valve platform, otherwise the same reason.
A control method for valve stand switching, comprising the steps of:
opening a third ball valve, a first ball valve, a fourth ball valve, a first main valve and a second main valve, and allowing pressure oil to enter a valve table selection block through the third ball valve;
step two, electrifying the valve table selection block, opening the first cartridge valve and closing the second cartridge valve when the electromagnet YA1 is electrified, and allowing pressure oil to enter the second valve table through the fourth ball valve and the second main valve, wherein the second valve table works; when the electromagnet YA2 is electrified, the second cartridge valve is opened, the first cartridge valve is closed, pressure oil enters the first valve table through the first ball valve and the first main valve, and the first valve table works;
and step three, when the valve table selection block breaks down, closing the third ball valve, the fourth ball valve and the first ball valve, and opening the fifth ball valve and the second ball valve to realize bypass work and overhaul the valve table selection block on line.
Further, the second ball valve and the fifth ball valve are in a normally closed state, and the first main valve, the first ball valve, the third ball valve, the fourth ball valve and the second main valve are in a normally open state.
As a further improvement of the present invention,
compared with the prior art, the beneficial effects of the invention are as follows:
(1) according to the control system and the control method for valve stand switching, the working valve stands are selected through the electromagnetic directional valves, misoperation is avoided, when one valve stand fails, quick switching can be achieved, stable production is guaranteed, when the valve stand does not work, the valve stands do not have pressure oil, and workers can achieve online maintenance.
(2) According to the control system and the control method for switching the valve tables, the first cartridge valve and the second cartridge valve are correspondingly arranged at the positions where the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected with the pressure oil pipeline, so that the automatic selection of the oil pipeline by the valve table selection block is realized, the electromagnetic reversing valves are electrified, when one electromagnetic reversing valve breaks down, only the other electromagnetic reversing valve needs to be directly switched, the normal operation cannot be influenced, the quick switching can be realized, and the stable production is ensured.
(3) According to the control system and the control method for switching the valve tables, the first main valve and the second main valve are used for carrying out main control on the first valve table and the second valve table respectively, the first main valve and the second main valve are in a normally open state, if two groups of valve tables of the valve table selection block break down, the second ball valve and the fifth ball valve are opened manually, the first ball valve and the fourth ball valve are closed, a bypass is selected to convey pressure oil, and the valve table selection block is overhauled on line.
(4) According to the control system and the control method for switching the valve tables, when two groups of valve tables in the valve table selection block have faults, the oil way of pressure oil entering the valve table selection block can be cut off only by directly turning off the third ball valve, then the second ball valve and the fifth ball valve are opened, the normal work of the system is ensured, and the valve table selection block can be overhauled on line.
Drawings
FIG. 1 is a schematic diagram of a valve stand switching control system according to the present invention;
wherein, 1, a valve table selecting block; 101. a first cartridge valve; 102. a second cartridge valve; 103. a first electromagnetic directional valve; 104. a second electromagnetic directional valve; 2. a first main valve; 3. a first ball valve; 4. a second ball valve; 5. a third ball valve; 6. a fourth ball valve; 7. a fifth ball valve; 8. a second main valve; 9. a first valve table; 10. a second valve station.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1, a control system for switching a valve table of the present embodiment includes: the pressure oil pipeline selects an oil way through the valve table selection block 1, and conveys the pressure oil to the first valve table 9 or the second valve table 10; the valve table selection block 1 comprises a first electromagnetic directional valve 103 and a second electromagnetic directional valve 104, the first electromagnetic directional valve 103 is communicated with a second valve table 10, and the second electromagnetic directional valve 104 is communicated with a first valve table 9; a second ball valve 4 and a fifth ball valve 7, wherein the first valve platform 9 is directly connected with the pressure oil pipeline through the second ball valve 4, and the second valve platform 10 is directly connected with the pressure oil pipeline through the fifth ball valve 7.
A control method for valve stand switching, comprising the steps of:
step one, opening a third ball valve 5, a first ball valve 3, a fourth ball valve 6, a first main valve 2 and a second main valve 8, and allowing pressure oil to enter a valve table selection block 1 through the third ball valve 5;
step two, electrifying the valve table selection block 1, opening the first cartridge valve 101 and closing the second cartridge valve 102 when the electromagnet YA1 is electrified, allowing pressure oil to enter the second valve table 10 through the fourth ball valve 6 and the second main valve 8, and allowing the second valve table 10 to work; when the electromagnet YA2 is electrified, the second cartridge valve 102 is opened, the first cartridge valve 101 is closed, pressure oil enters the first valve table 9 through the first ball valve 3 and the first main valve 2, and the first valve table 9 works;
and step three, when the valve table selection block 1 breaks down, closing the third ball valve 5, the fourth ball valve 6 and the first ball valve 3, and opening the fifth ball valve 7 and the second ball valve 4 to realize bypass work and overhaul the valve table selection block 1 on line.
Compare with prior art, the valve platform selecting arrangement of this scheme safe and reliable, select the work valve platform through the solenoid directional valve, avoid causing the maloperation, when one of them valve platform trouble, can realize the fast switch-over, guarantee that production is stable going on, when out of work, the valve platform does not have pressure oil, the staff can realize on-line maintenance, and, the valve platform selecting arrangement of this scheme still has manual bypass and selects, when two valve platforms all break down, the manual bypass of accessible carries out work, make things convenient for the staff to inspect the device.
Further, the valve table selection block 1 further includes a first cartridge valve 101 and a second cartridge valve 102, the first cartridge valve 101 is connected to the first electromagnetic directional valve 103, and the second cartridge valve 102 is connected to the second electromagnetic directional valve 104.
The first cartridge valve 101 and the second cartridge valve 102 are correspondingly installed at the connecting parts of the first electromagnetic directional valve 103 and the second electromagnetic directional valve 104 and the pressure oil pipeline, so that the automatic selection of the valve table selection block 1 on the oil pipeline is realized, the electromagnetic directional valves are only needed to be electrified, when one of the electromagnetic directional valves breaks down, only the electromagnetic directional valves are needed to be directly switched to the other electromagnetic directional valve, the normal operation cannot be influenced, the quick switching can be realized, and the stable production is ensured.
Example 2
Compared with the embodiment 1, the control system for switching the valve stages of the embodiment further includes, as shown in fig. 1, a first ball valve 3 and a fourth ball valve 6, wherein the first ball valve 3 communicates the first valve stage 9 and the second cartridge valve 102, and the fourth ball valve 6 communicates the second valve stage 10 and the first cartridge valve 101.
Specifically, the fourth ball valve and the first ball valve are both arranged outside the valve table selection block and are in a normally open state, when the valve table selection block normally works, the first electromagnetic directional valve 103 is electrified, the first cartridge valve 101 is opened, pressure oil flows to the second valve table 10 through the fourth ball valve 6, at this time, the second electromagnetic directional valve 104 is not electrified, the first ball valve 3 does not need to be closed, similarly, the second electromagnetic directional valve 104 is electrified, the second cartridge valve 102 is opened, the pressure oil flows to the first valve table 9 through the first ball valve 3, at this time, the first electromagnetic directional valve 103 is not electrified, and the fourth ball valve 6 does not need to be closed; when the first electromagnetic directional valve 103 or the second electromagnetic directional valve 104 fails, the power source of the valve stand on the side where the failure occurs is cut off, and the fourth ball valve 6 or the first ball valve 3 can be closed, so that the valve stand on the side where the failure occurs can be repaired on line.
The first ball valve 3 and the second ball valve 4 are communicated with the first valve platform 9 through a first main valve 2, and the fourth ball valve 6 and the fifth ball valve 7 are communicated with the second valve platform 10 through a second main valve 8.
Carry out total accuse to first valve platform 9 and second valve platform 10 respectively through first main valve 2 and second main valve 8, and first main valve 2 and second main valve 8 all are in normally open state, if when two sets of valve platforms of valve platform selection block 1 all break down, only need manually open second ball valve 4 and fifth ball valve 7, close first ball valve 3 and fourth ball valve 6, select the bypass to carry pressure oil, overhaul valve platform selection block 1 on line.
The pressure oil pipeline and the valve table selection block 1 are controlled through a third ball valve 5; when two groups of valve tables in the valve table selection block 1 break down, pressure oil can be cut off to enter an oil way of the valve table selection block 1 only by directly turning off the third ball valve 5, then the second ball valve 4 and the fifth ball valve 7 are opened to ensure the normal work of the system, and the valve table selection block 1 can be overhauled on line.
Example 3
Compared with the embodiment 2, in the control system for switching the valve stands of the embodiment, the second ball valve 4 and the fifth ball valve 7 are in the normally closed state, the first main valve 2, the first ball valve 3, the third ball valve 5, the fourth ball valve 6 and the second main valve 8 are in the normally open state, an electromagnet YA1 is arranged in the first electromagnetic directional valve 103, when the electromagnet YA1 is powered, the first cartridge valve 101 is opened, and the second cartridge valve 102 is closed; an electromagnet YA2 is arranged in the second electromagnetic directional valve 104, and when the electromagnet YA2 is electrified, the second cartridge valve 102 is opened, and the first cartridge valve 101 is closed.
Under the normal operating condition, pressure oil enters into valve platform selection block through third ball valve 5, when electro-magnet YA1 of first electromagnetic directional valve 103 received the electricity, the solenoid valve was in the left position, first cartridge valve 101 was opened, pressure oil got into second valve platform 10 through fourth ball valve 6 and second main valve 8, second electromagnetic directional valve 104 did not receive the electricity this moment, first valve platform 9 does not have the power supply, can realize online maintenance first valve platform 9, the same reason, when electro-magnet YA2 of second electromagnetic directional valve 104 received the electricity, the solenoid valve was in the right position, second cartridge valve 102 was opened, pressure oil got into first valve platform 9 through first ball valve 3 and first main valve 2, at this moment, first electromagnetic directional valve 103 did not receive the electricity, second valve platform 10 did not have the power supply, can realize online maintenance second valve platform 10.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A control system for valve station switching, comprising:
the pressure oil pipeline selects an oil way through the valve table selection block (1) through the pressure oil pipeline and conveys the pressure oil to the first valve table (9) or the second valve table (10);
the valve table selection block (1), the valve table selection block (1) comprises a first electromagnetic directional valve (103) and a second electromagnetic directional valve (104), the first electromagnetic directional valve (103) is communicated with a second valve table (10), and the second electromagnetic directional valve (104) is communicated with a first valve table (9);
the first valve stand (9) is directly connected with the pressure oil pipeline through the second ball valve (4), and the second valve stand (10) is directly connected with the pressure oil pipeline through the fifth ball valve (7).
2. A control system for valve stand switching according to claim 1, characterized in that the valve stand selection block (1) further comprises a first cartridge valve (101) and a second cartridge valve (102), the first cartridge valve (101) being connected with the first electromagnetic directional valve (103), the second cartridge valve (102) being connected with the second electromagnetic directional valve (104).
3. A control system for valve stand switching according to claim 2, further comprising a first ball valve (3) and a fourth ball valve (6), the first ball valve (3) communicating the first valve stand (9) and the second cartridge valve (102), the fourth ball valve (6) communicating the second valve stand (10) and the first cartridge valve (101).
4. A control system for valve stand switching according to claim 3, characterized in that the first ball valve (3) and the second ball valve (4) communicate with the first valve stand (9) through a first main valve (2), and the fourth ball valve (6) and the fifth ball valve (7) communicate with the second valve stand (10) through a second main valve (8).
5. A control system for valve station switching according to claim 1, characterized in that the control between the pressure oil conduit and the valve station selection block (1) is performed by means of a third ball valve (5).
6. The control system for valve stand switching according to claim 2, wherein an electromagnet YA1 is arranged in the first electromagnetic directional valve (103), when the electromagnet YA1 is electrified, the first cartridge valve (101) is opened, and the second cartridge valve (102) is closed; an electromagnet YA2 is arranged in the second electromagnetic directional valve (104), and when the electromagnet YA2 is electrified, the second cartridge valve (102) is opened, and the first cartridge valve (101) is closed.
7. A control method for valve stand switching, comprising the steps of:
step one, opening a third ball valve (5), a first ball valve (3), a fourth ball valve (6), a first main valve (2) and a second main valve (8), and allowing pressure oil to enter a valve table selection block (1) through the third ball valve (5);
step two, electrifying the valve table selection block (1), opening the first cartridge valve (101) and closing the second cartridge valve (102) when the electromagnet YA1 is electrified, allowing pressure oil to enter the second valve table (10) through the fourth ball valve (6) and the second main valve (8), and allowing the second valve table (10) to work; when the electromagnet YA2 is electrified, the second cartridge valve (102) is opened, the first cartridge valve (101) is closed, pressure oil enters the first valve table (9) through the first ball valve (3) and the first main valve (2), and the first valve table (9) works;
and step three, when the valve table selection block (1) breaks down, closing the third ball valve (5), the fourth ball valve (6) and the first ball valve (3), opening the fifth ball valve (7) and the second ball valve (4), realizing bypass work, and overhauling the valve table selection block (1) on line.
8. A control method for valve stand switching according to claim 7, characterized in that the second ball valve (4) and the fifth ball valve (7) are in a normally closed state, and the first main valve (2), the first ball valve (3), the third ball valve (5), the fourth ball valve (6) and the second main valve (8) are in a normally open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249592.6A CN111306130B (en) | 2020-04-01 | 2020-04-01 | Control system and control method for valve stand switching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249592.6A CN111306130B (en) | 2020-04-01 | 2020-04-01 | Control system and control method for valve stand switching |
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| CN111306130A true CN111306130A (en) | 2020-06-19 |
| CN111306130B CN111306130B (en) | 2022-06-03 |
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| GB9315778D0 (en) * | 1993-07-30 | 1993-09-15 | Pridham Peter W | Proportional control hydraulic valves |
| CN103244501A (en) * | 2013-05-14 | 2013-08-14 | 三一汽车起重机械有限公司 | Hydraulic control valve group, hydraulic system and engineering machine |
| CN104196540A (en) * | 2014-05-04 | 2014-12-10 | 中铁工程装备集团有限公司 | Automatic and random grouping push control system of shield tunneling machine |
| US20180037447A1 (en) * | 2015-03-04 | 2018-02-08 | Xuzhou Heavy Machinery Co., Ltd. | Switching valve, switching hydraulic system and crane |
| CN109812461A (en) * | 2019-03-29 | 2019-05-28 | 中铁工程装备集团有限公司 | Convenient for the split type shield machine hydraulic drive control valve group and its control method of assembling |
| CN110594214A (en) * | 2019-09-24 | 2019-12-20 | 湖北力帝机床股份有限公司 | Hydraulic control system of metal packing hydraulic press |
| CN212130930U (en) * | 2020-04-01 | 2020-12-11 | 中钢集团西安重机有限公司 | Valve table selecting device |
-
2020
- 2020-04-01 CN CN202010249592.6A patent/CN111306130B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9315778D0 (en) * | 1993-07-30 | 1993-09-15 | Pridham Peter W | Proportional control hydraulic valves |
| CN103244501A (en) * | 2013-05-14 | 2013-08-14 | 三一汽车起重机械有限公司 | Hydraulic control valve group, hydraulic system and engineering machine |
| CN104196540A (en) * | 2014-05-04 | 2014-12-10 | 中铁工程装备集团有限公司 | Automatic and random grouping push control system of shield tunneling machine |
| US20180037447A1 (en) * | 2015-03-04 | 2018-02-08 | Xuzhou Heavy Machinery Co., Ltd. | Switching valve, switching hydraulic system and crane |
| CN109812461A (en) * | 2019-03-29 | 2019-05-28 | 中铁工程装备集团有限公司 | Convenient for the split type shield machine hydraulic drive control valve group and its control method of assembling |
| CN110594214A (en) * | 2019-09-24 | 2019-12-20 | 湖北力帝机床股份有限公司 | Hydraulic control system of metal packing hydraulic press |
| CN212130930U (en) * | 2020-04-01 | 2020-12-11 | 中钢集团西安重机有限公司 | Valve table selecting device |
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| CN111306130B (en) | 2022-06-03 |
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