CN104745754A - Hydraulic control loop of blast furnace top distributing gear - Google Patents
Hydraulic control loop of blast furnace top distributing gear Download PDFInfo
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- CN104745754A CN104745754A CN201510187918.6A CN201510187918A CN104745754A CN 104745754 A CN104745754 A CN 104745754A CN 201510187918 A CN201510187918 A CN 201510187918A CN 104745754 A CN104745754 A CN 104745754A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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Abstract
The invention discloses a hydraulic control loop of a blast furnace top distributing gear, which comprises at least three tilting hydraulic cylinders, wherein each tilting hydraulic cylinder is provided with an independent closed control loop which is used for realizing the independent closed position control of the tilting hydraulic cylinder and the dynamic and static compensation control of a hydraulic cylinder position in the moving process of the blast furnace top distributing gear. The hydraulic control loop further comprises a switching loop which is used for realizing automatic switching between an independent closed control mode and a free synchronous control mode. The hydraulic control loop has the characteristics of high control precision, small synchro error, high reliability and high safety, meets the requirement of high-precision distribution at the top of a blast furnace, and meanwhile can switch to the free synchronous mode on the basis of eliminating a centralized control loop.
Description
Technical field
The invention belongs to field of metallurgical machine, be specifically related to a kind of hydraulic control circuit of blast-furnace top distributing device.
Background technology
The control of blast-furnace top distributing device is a key link of blast furnace burden distribution system, and its control accuracy directly has influence on the cloth precision of blast furnace burden distribution system.Existing distributor or the simple concentrated hydraulic control method of employing, namely the action of multiple hydro-cylinder is controlled by a valve, hydraulic efficiency oil in multiple hydro-cylinder can vibration mutually, or adopt compound hydraulic control method, namely by three independent close loop control circuits for hydraulic control cylinder, for realizing three Position of Hydraulic Cylinder dynamic compesated control in the independent position-force control of each hydro-cylinder and distributor moving process, comprise a concentrated hydraulic control circuit simultaneously, realized the automatic switchover of two kinds of hydraulic control circuits by a switching circuit.Under front one concentrates hydraulic control mode, the control accuracy of distributor depends primarily on the gap length between the guide wheel be installed on backing ring and the guide rail be installed on housing, therefore in order to improve the cloth precision of distributor, realize mainly through the gap between the less guide rail of adjustment and guide wheel at present, in fact this method is difficult to the precision ensureing cloth, because the gap between guide rail and guide wheel reduces, mechanical workout and assembly difficulty can be increased, improve manufacturing cost, also easily cause distributor stuck under the high temperature conditions simultaneously.In addition, because distributor underlying load exists unbalance loading, cause the distributor backing ring under Driven by Hydraulic Cylinder to be in alternation strained condition all the time, exacerbate the impact between guide wheel and guide rail and wearing and tearing.Rear a kind of composite hydraulic control system can solve the problem of concentrated hydraulic control system, starts and apply widely in engineering.But its loop is too complicated, and cost is higher, controls and safeguard not easily.
Summary of the invention
In view of this, the object of this invention is to provide a kind of hydraulic control circuit of blast-furnace top distributing device, the above-mentioned defect of prior art can be overcome.
The object of the invention is to be achieved through the following technical solutions:
A kind of blast-furnace top distributing device hydraulic control circuit, described hydraulic control circuit comprises at least three hydro-cylinders that fascinate, the described hydro-cylinder that fascinates is provided with independent close loop control circuit, the close loop control circuit of the described hydro-cylinder that fascinates is for realizing the dynamic Static Compensation Control of Position of Hydraulic Cylinder in the independent position-force control of each hydro-cylinder and distributor moving process, described hydraulic control circuit also comprises a switching circuit, and described switching circuit is for realizing the automatic switchover between independent close-loop control mode and free synchronization control mode.
Further, described single close loop control circuit comprises: proportional valve, the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve and reversing valve; Wherein, the P mouth of proportional valve is connected to outside inflow pipeline by the first hydraulic control one-way valve, and the T mouth of proportional valve is connected to outside oil returning tube; The A mouth of proportional valve is by being connected to the rodless cavity of hydro-cylinder after the second hydraulic control one-way valve; The B mouth of proportional valve is by being connected to the rod chamber of hydro-cylinder after the 3rd hydraulic control one-way valve; Proportional valve A mouth or B mouth is communicated to after the pressure oil passing ratio valve commutation of the P mouth of proportional valve, the P mouth of described reversing valve, T mouth are connected to outside inflow pipeline and outside oil returning tube respectively, B mouth is connected to the control port of the first to the 3rd hydraulic control one-way valve, and the drain tap of all first to the 3rd hydraulic control one-way valve is connected to outside draining pipeline L.
Further, described switching circuit comprises: switching electromagnetic cartridge valve; Cover plate cartridge valve, described switching circuit is by the break-make of each hydro-cylinder inlet and outlet of fuel channel of electromagnetic cartridge valve top dress directional valve commutation control.
Further, described single close loop control circuit comprises: proportional valve and electromagnetic shut-off valve; Wherein, the P mouth of proportional valve is connected to outside inflow pipeline by electromagnetic poppet valves, and the T mouth of proportional valve is connected to outside oil returning tube; The A mouth of proportional valve, B mouth are connected to rodless cavity and the rod chamber of hydro-cylinder by electromagnetic shut-off valve.
Further, described switching circuit is separately positioned on independently on oil path block, comprising: switching electromagnetic cartridge valve, cover plate cartridge valve, can by the break-make of the top dress directional valve of electromagnetic cartridge valve commutation control hydro-cylinder inlet and outlet of fuel channel simultaneously.
Further, the hydro-cylinder that fascinates described in is also provided with pressure transmitter and displacement sensor.
Further, described each close loop control circuit includes at least one security protection module: described security protection module, for when hydraulic circuit breaks down, carries out the work of corresponding draining and repairing.
The invention has the beneficial effects as follows: the invention provides a kind of simple and reliable blast-furnace top distributing device hydraulic control circuit, this system can control separately with three (or multiple) hydro-cylinders, have the advantages that control accuracy is high, synchronous error is few, reliance security is good, be applicable to the requirement of blast furnace roof high precision cloth, also can be switched to free synchronization pattern on the basis of cancelling centralized Control loop simultaneously.
Present invention preserves all advantages of distributor composite hydraulic control system:
(1) after using this system, the cloth precision of distributor depends primarily on the control accuracy of hydraulic efficiency system, the off-position precision of oil cylinder is ensured by the position-force control that three cylinders are independent, under closed-loop control condition, adopt Strategy For Synchronization Control that three cylinders are in course of adjustment simultaneously also keep synchronous, drastically increase the cloth precision of distributor, avoid mechanical guide error effect cloth precision problem.
(2) position of three oil cylinders can be adjusted by independent closed-loop control in good time, ensure in working process that backing ring is in horizontality substantially, reduce the impact between guide wheel and guide rail and wearing and tearing.
(3) the present invention devises switching circuit in this hydraulic control circuit, automatically can also be changed under independent closed-loop synchronization controls the two kinds of master modes controlled with free synchronization by this loop of signal detected, thus improve the reliability and security of whole Controlling System.
In addition, the present invention is different schemes from prior art " a kind of composite hydraulic control system of blast-furnace top distributing device ", it only has a switching circuit, does not have centralized Control loop, and can realize the automatic switchover between independent close loop control circuit and free synchronization control loop.The present invention is by cancelling the centralized Control loop in distributor composite hydraulic control system, have employed newly-designed switching control loop, not only can realize identical function, and realize switching with less element and loop, reliability and security better, more economical and practical.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by specification sheets below and obtain.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the structural representation of the embodiment of the present invention 1;
Fig. 3 is the structural representation of the embodiment of the present invention 2.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
Embodiment 1, as shown in Figure 2:
Independent close loop control circuit is that three groups: first group of independent close loop control circuit comprises: the P mouth of proportional valve 3.1 is connected to outside inflow pipeline by the first hydraulic control one-way valve 5.1, and the T mouth of proportional valve 3.1 is connected to outside oil returning tube; The A mouth of proportional valve is by being connected to the rodless cavity of hydro-cylinder 1.1 after the second hydraulic control one-way valve 5.2; The B mouth of proportional valve 3.1 is by being connected to the rod chamber of hydro-cylinder 1.1 after the 3rd hydraulic control one-way valve 5.3; Proportional valve A mouth or B mouth is communicated to after the pressure oil passing ratio valve commutation of the P mouth of proportional valve 3.1; Controller sends proportioning valve control signal by closed-loop control computed in software after receiving command object signal, thus realizes commutation and the valve opening control of proportional valve; The control realization of passing ratio valve to the dynamic benefit of hydro-cylinder 1.1 rodless cavity and rod chamber, oil extraction, thus makes hydro-cylinder 1.1 reach and remain on target location.
Second group of independent close loop control circuit comprises: the P mouth of proportional valve 3.2 is connected to outside inflow pipeline by hydraulic control first check valve 5.4, and the T mouth of proportional valve 3.2 is connected to outside oil returning tube; The A mouth of proportional valve 3.2 is by being connected to the rodless cavity of hydro-cylinder 1.2 after the second hydraulic control one-way valve 5.5; The B mouth of proportional valve 3.2 is by being connected to the rod chamber of hydro-cylinder 1.2 after the 3rd hydraulic control one-way valve 5.6;
3rd group of independent close loop control circuit comprises: the P mouth of proportional valve 3.3 is connected to outside inflow pipeline by the first hydraulic control one-way valve 3.7, and the T mouth of proportional valve 3.3 is connected to outside oil returning tube; The A mouth of proportional valve 3.3 is by being connected to the rodless cavity of hydro-cylinder 1.3 after the second hydraulic control one-way valve 5.8; The B mouth of proportional valve 3.3 is by being connected to the rod chamber of hydro-cylinder 1.3 after the 3rd hydraulic control one-way valve 5.9;
Second independent close loop control circuit is identical with the control principle of the 3rd independent close loop control circuit, no longer repeats at this.
Reversing valve 4.1; 4.2; P mouth, the T mouth of 4.3 are connected to outside inflow pipeline and outside oil returning tube respectively, and B mouth is connected to hydraulic control one-way valve 5.1-5.3 respectively; 5.4-5.6; The control port of 5.7-5.9; The drain tap of all hydraulic control one-way valve 5.1-5.9 is connected to outside draining pipeline L; When the independent closed-loop control of needs, reversing valve 4.1-4.3 works, reversing valve 4.1; 4.2; The hydraulic fluid port B of 4.3 has control pressure, thus opens 5.1-5.3 respectively; 5.4-5.6; 5.7-5.9 hydraulic control one-way valve.All controlled the break-make of hydraulic control one-way valve owing to often organizing independent control loop by a reversing valve, when therefore often organizing independent control loop fault, oil circuit can be cut off separately and on-bne repair.
Switching circuit includes: switching electromagnetic cartridge valve 11.1; Cover plate cartridge valve 12.1-12.3, can by 11.1 top dress directional valve commutations, the break-make of control A1, A2, A3 and B1, B2, B3 oil circuit, thus realize the switching of free synchronization control loop and independent close loop control circuit.
When the top dress directional valve of electromagnetic cartridge valve 11.1 obtains electric, cartridge valve 11.1,12.1-12.3 is opened, A1, A2, A3 and B1, the conducting respectively of B2, B3 oil circuit, any two loop works of proportional valve 3.1-3.3, drive oil cylinder 1.1-1.3 action, just achieve free synchronization and control.
Security protection module comprises three groups: first group of security protection module and comprises: the entrance of safety overflow valve 10.1 is connected with hydraulic fluid port A1, and outlet connects outside oil returning tube; The entrance of safety overflow valve 10.2 is connected with hydraulic fluid port B1, and outlet connects outside oil returning tube.When hydro-cylinder 1.1 be subject to foreign impacts or other fault causes make it have to stretch out or the trend of retracting and pressure are greater than safe pressure time, overflow pressure relief can be carried out by the safety valve of this module in cylinder chamber.
The principle of second group, the 3rd group security protection module is identical with first group with effect, at this not in repetition.
During normal work, A1, A2, A3 and B1, B2, B3 oil circuit cut off and No leakage by switching circuit completely.Such three hydro-cylinders carry out independent position-force control by three groups of independent close loop control circuits, meanwhile, ensure synchronous in moving process of oil cylinder by the closed-loop synchronization control method of three cylinders, thus ensure the position control accuracy that distributor fascinates in cloth process.
In cloth process, if any one pressure transmitter 6.1 ~ 6.6 on three oil cylinders occurs abnormal with displacement sensor 7.1-7.3, namely exceed certain error, a synchronous error fault or other trouble signals of oil circuit will have been produced; When Controlling System detects this signal, system makes the top of electromagnetic cartridge valve 11.1 dress directional valve obtain electric automatically, A1, A2, A3 and B1, the conducting respectively of B2, B3 oil circuit, close arbitrary group of independent close loop control circuit simultaneously, any two loop works of proportional valve 3.1-3.3, drive oil cylinder 1.1-1.3 action.Now only there is the closed-loop control of an oil cylinder participant position, the synchronous of three oil cylinders is realized by mechanical guide. like this, if there is the exception of position and pressure in any one oil cylinder of whole cloth system, for safety assurance, hydraulic efficiency system automatically switches to free synchronization control loop, the oil circuit of three oil cylinders is interconnected, allows oil liquid pressure can adaptive equalization, thus avoid the mutual interference due to oil cylinder or mechanical mechanism etc. to cause the destruction of system weakness.Ensure that the reliability and security of whole system, for the safety in production of cloth control system and maintenance provide guarantee.
In addition, if in-oil cylinder oil pressure is because of a variety of causes generation superpressure or when inhaling empty phenomenon in any link of cloth, security protection module can carry out draining and repairing action to oil cylinder, plays the effect of safeguard protection, makes whole system more reliable and secure.
The proportional valve that the present invention uses also can substitute with servo-valve, and trip valve can adopt cartridge valve, hydraulic control one-way valve or Solenoid seated valve etc., and similar this conversion all drops within protection scope of the present invention.
Embodiment 2, as shown in Figure 3:
Independent close loop control circuit is that three groups: first group of independent close loop control circuit comprises: the P mouth of proportional valve 2.1 is connected to outside inflow pipeline by electromagnetic poppet valves 9.1, and the T mouth of proportional valve 2.1 is connected to outside oil returning tube; The A mouth of proportional valve, B mouth are connected to rodless cavity and the rod chamber of hydro-cylinder 1.1 by electromagnetic shut-off valve 3.1; Controller receives command object signal later by closed-loop control computed in software proportioning valve control signal, thus realizes commutation and the valve opening control of proportional valve; The control realization of passing ratio valve to the dynamic benefit of hydro-cylinder 1.1 rodless cavity and rod chamber, oil extraction, thus makes hydro-cylinder 1.1 reach and remain on target location.
Second group of independent close loop control circuit comprises: the P mouth of proportional valve 2.2 is connected to outside inflow pipeline by electromagnetic poppet valves 9.2, and the T mouth of proportional valve 2.2 is connected to outside oil returning tube; The A mouth of proportional valve, B mouth are connected to rodless cavity and the rod chamber of hydro-cylinder 1.2 by electromagnetic shut-off valve 3.2;
3rd group of independent close loop control circuit comprises: the P mouth of proportional valve 2.3 is connected to outside inflow pipeline by electromagnetic poppet valves 9.3, and the T mouth of proportional valve 2.3 is connected to outside oil returning tube; The A mouth of proportional valve, B mouth are connected to rodless cavity and the rod chamber of hydro-cylinder 1.3 by electromagnetic shut-off valve 3.3;
Second independent close loop control circuit is identical with the control principle of the 3rd independent close loop control circuit, no longer repeats at this.
Electromagnetic poppet valves 9.1,9.2,9.3 and electromagnetic shut-off valve 3.1,3.2,3.3 electric time, respectively conducting three proportional valves 2.1,2.2,2.3 each chamber oil circuits: the oil-feed of proportional valve and the conducting of principal pressure oil circuit, the oil return of proportional valve and host system oil return conducting, the A of three proportional valves, B hydraulic fluid port respectively with the rodless cavity A1 of corresponding oil cylinder, A2, A3 and rod chamber B1, B2, B3 conducting.
Switching circuit is separately positioned on three independently on oil path block, includes: switching electromagnetic cartridge valve 7.1,7.2,7.3; Cover plate cartridge valve 5.1,5.2,5.3, can be commutated by the top dress directional valve of electromagnetic cartridge valve 7.1-7.3 simultaneously, the break-make of control A1, A2, A3 and B1, B2, B3 oil circuit, thus realizes the switching of free synchronization control loop and independent close loop control circuit.
When the top dress directional valve of electromagnetic cartridge valve 7.1-7.3 obtains electric, cartridge valve 7.1-7.3,5.1-5.3 opens, A1, A2, A3 and B1, the conducting respectively of B2, B3 oil circuit, any two loop works of proportional valve 2.1-2.3, drive oil cylinder 1.1-1.3 action, just achieve free synchronization and control.
Security protection module comprises three groups: first group of security protection module and comprises: the surplus valve entrance of superposition format functional block 10.1 left and right sides and hydraulic fluid port A1; B1 is connected; outlet connects outside oil returning tube by the oil return opening on Sandwich plate valve; when hydro-cylinder 1.1 be subject to foreign impacts or other fault causes make it have to stretch out or the trend of retracting and pressure are greater than safe pressure time, overflow pressure relief can be carried out by the safety valve of this module in cylinder chamber.
The principle of second group, the 3rd group security protection module is identical with first group with effect, at this not in repetition.
During normal work, A1, A2, A3 and B1, B2, B3 oil circuit cut off and No leakage by switching circuit completely.Such three hydro-cylinders carry out independent position-force control by three groups of independent close loop control circuits, meanwhile, ensure synchronous in moving process of oil cylinder by the closed-loop synchronization control method of three cylinders, thus ensure the positional precision that distributor fascinates in cloth process.
In cloth process, if any one pressure transmitter 6.1 ~ 6.6 on three oil cylinders occurs abnormal with displacement sensor 8.1,8.2 or 8.3, namely exceed certain error, a synchronous error fault or other trouble signals of oil circuit will have been produced; When Controlling System detects this signal, system makes the top of electromagnetic cartridge valve 7.1-7.3 dress directional valve obtain electric automatically, A1, A2, A3 and B1, the conducting respectively of B2, B3 oil circuit, close arbitrary group of independent close loop control circuit simultaneously, any two loop works of proportional valve 2.1-2.3, drive oil cylinder 1.1-1.3 action.Now only there is the closed-loop control of an oil cylinder participant position, the synchronous of three oil cylinders is realized by mechanical guide. like this, if there is the exception of position and pressure in any one oil cylinder of whole cloth system, for safety assurance, hydraulic efficiency system automatically switches to free synchronization control loop, the oil circuit of three oil cylinders is interconnected, allows oil liquid pressure can adaptive equalization, thus avoid the mutual interference due to oil cylinder or mechanical mechanism etc. to cause the destruction of system weakness.Ensure that the reliability and security of whole system, for the safety in production of cloth control system and maintenance provide guarantee.
In addition, if in-oil cylinder oil pressure is because of a variety of causes generation superpressure or when inhaling empty phenomenon in any link of cloth, security protection module can carry out draining and repairing action to oil cylinder, plays the effect of safeguard protection, makes whole system more reliable and secure.
In addition, the present embodiment adopts the particular design of Sandwich plate valve and three groups of independence cartridge valves to make three oil path blocks independent of one another in a large number, and three oil path block small volumes.Three oil path blocks can be arranged on distributor three oil cylinder sides respectively, connect by means of only pipeline, which reduce the duct length between valve platform and oil cylinder, be conducive to improving synchronous control accuracy.
The proportional valve that the present invention uses also can substitute with servo-valve, and trip valve can adopt cartridge valve, hydraulic control one-way valve or Solenoid seated valve etc., and similar this conversion all drops within protection scope of the present invention.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a blast-furnace top distributing device hydraulic control circuit, it is characterized in that: described hydraulic control circuit comprises at least three hydro-cylinders that fascinate, the described hydro-cylinder that fascinates is provided with independent close loop control circuit, the close loop control circuit of the described hydro-cylinder that fascinates is for realizing the dynamic Static Compensation Control of Position of Hydraulic Cylinder in the independent position-force control of each hydro-cylinder and distributor moving process, described hydraulic control circuit also comprises a switching circuit, and described switching circuit is for realizing the automatic switchover between independent close-loop control mode and free synchronization control mode.
2. blast-furnace top distributing device hydraulic control circuit according to claim 1, is characterized in that: described single close loop control circuit comprises: proportional valve (3.1), the first hydraulic control one-way valve (5.1), the second hydraulic control one-way valve (5.2), the 3rd hydraulic control one-way valve (5.3) and reversing valve (4.1); Wherein, the P mouth of proportional valve (3.1) is connected to outside inflow pipeline by the first hydraulic control one-way valve (5.1), and the T mouth of proportional valve (3.1) is connected to outside oil returning tube; The A mouth of proportional valve (3.1) is by being connected to the rodless cavity of hydro-cylinder (1.1) after the second hydraulic control one-way valve (5.2); The B mouth of proportional valve (3.1) is by being connected to the rod chamber of hydro-cylinder (1.1) after the 3rd hydraulic control one-way valve (5.3); Proportional valve A mouth or B mouth is communicated to after the pressure oil passing ratio valve commutation of the P mouth of proportional valve (3.1), the P mouth of described reversing valve (4.1), T mouth are connected to outside inflow pipeline and outside oil returning tube respectively, B mouth is connected to the control port of the first to the 3rd hydraulic control one-way valve (5.1-5.3), and the drain tap of all first to the 3rd hydraulic control one-way valve (5.1-5.3) is connected to outside draining pipeline L.
3. blast-furnace top distributing device hydraulic control circuit according to claim 2, is characterized in that: described switching circuit comprises: switching electromagnetic cartridge valve (11.1); Cover plate cartridge valve (12.1-12.3), described switching circuit is by the break-make of each hydro-cylinder inlet and outlet of fuel channel of electromagnetic cartridge valve (11.1) top dress directional valve commutation control.
4. blast-furnace top distributing device hydraulic control circuit according to claim 1, is characterized in that: described single close loop control circuit comprises: proportional valve (2.1) and electromagnetic shut-off valve (3.1); Wherein, the P mouth of proportional valve (2.1) is connected to outside inflow pipeline by electromagnetic poppet valves (9.1), and the T mouth of proportional valve (2.1) is connected to outside oil returning tube; The A mouth of proportional valve (2.1), B mouth are connected to rodless cavity and the rod chamber of hydro-cylinder (1.1) by electromagnetic shut-off valve (3.1).
5. blast-furnace top distributing device hydraulic control circuit according to claim 4, it is characterized in that: described switching circuit is separately positioned on independently on oil path block, comprise: switching electromagnetic cartridge valve (7.1 ~ 7.3), cover plate cartridge valve (5.1 ~ 5.3), the break-make of the top dress directional valve that can pass through electromagnetic cartridge valve (7.1 ~ 7.3) simultaneously commutation control hydro-cylinder inlet and outlet of fuel channel.
6. blast-furnace top distributing device hydraulic control circuit according to claim 1, is characterized in that: described in the hydro-cylinder that fascinates also be provided with pressure transmitter (6.1 ~ 6.6) and displacement sensor (7.1-7.3 and 8.1 ~ 8.3).
7. blast-furnace top distributing device hydraulic control circuit according to claim 1; it is characterized in that: described each close loop control circuit includes at least one security protection module: described security protection module; for when hydraulic circuit breaks down, carry out the work of corresponding draining and repairing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510187918.6A CN104745754B (en) | 2015-04-17 | 2015-04-17 | Blast-furnace top distributing device hydraulic control circuit |
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| CN201510187918.6A CN104745754B (en) | 2015-04-17 | 2015-04-17 | Blast-furnace top distributing device hydraulic control circuit |
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| CN108796158A (en) * | 2018-09-13 | 2018-11-13 | 中冶东方工程技术有限公司 | Distributing device with interlocking hydraulic control system |
| CN114410868A (en) * | 2022-01-23 | 2022-04-29 | 中钢集团西安重机有限公司 | Blast furnace top material flow adjusting control system and method |
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| CN104745754B (en) | 2017-03-29 |
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