CN106438553A - Novel hydraulic loading system for coal mill - Google Patents
Novel hydraulic loading system for coal mill Download PDFInfo
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- CN106438553A CN106438553A CN201610827558.6A CN201610827558A CN106438553A CN 106438553 A CN106438553 A CN 106438553A CN 201610827558 A CN201610827558 A CN 201610827558A CN 106438553 A CN106438553 A CN 106438553A
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- valve
- back pressure
- loading
- coal mill
- flow valve
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/021—Installations or systems with accumulators used for damping
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to a novel hydraulic loading system for a coal mill. The system comprises a main motor, a duplex gear pump, a loading circuit, a back pressure loop, a return oil filtering system and a self-filtering system; the main motor drives the duplex gear pump to provide hydraulic oil for the system; the main motor, the duplex gear pump, the loading circuit, the back pressure loop, the return oil filtering system and the self-filtering system are connected through pipelines. The system is optimized on the basis of an early hydraulic system, a control element is simplified, the back pressure function and the self-filtering system are added, the system comprises six flow control valves, two valves constitute a group corresponding to one loading oil cylinder, the valves are independent of one another, synchronous lifting of grinding rollers of the coal mill can be well adjusted, and the coal type adaptability of the coal mill and the environmental adaptability of the hydraulic system are improved.
Description
Technical field
The present invention relates to coal pulverizer technical field is and in particular to a kind of novel coal mill hydraulic loading system.
Background technology
Hydraulic loading system is widely used on the roller ring mills such as coal-fired plant, chemical industry, coal liquifaction, cement, iron and steel,
Coal pulverizer by coal crusher and wears into coal dust, and hydraulic loading system provides with load (feeder coal amount) change for the grinding roller of coal pulverizer
The pressure of milling changed, its size controls hydraulic oil by proportional pressure control valve according to the command signal that load (feeder coal amount) changes
The pressure of system is realizing.As Chinese invention patent 201410057370.9 discloses a kind of coal pulverizer, to conventional type ZGM middling speed
The hydraulic loading device of coal pulverizer improves, and makes loading force more stable and accurate, reduces vibrations, grinds coarse granule to meet it
Coal dust broken, grind, be dried, separating demand.Recent year to coal pulverizer hydraulic loading system constantly carried out improve and
Optimize, but there are problems：1st, in running, on mill, coal seam is excessively thin or coal type change is excessive, particularly in raw coal
When fineness is little, the phenomenon that coal-grinding machine vibration becomes big easily occurs；2nd, the cleannes of hydraulic oil do not reach use requirement, cause
System failure rate is high, increases maintenance cost.Design a kind of novel coal mill hydraulic loading system in order to solve the above problems.
Content of the invention
The present invention provides a kind of novel coal mill hydraulic loading system, to solve the coal pulverizer hydraulic loaded system of prior art
The technical problem that system exists.
In order to solve above-mentioned technical problem, embodiments provide one kind be applied to coal-fired plant, chemical industry, coal liquifaction,
The hydraulic loading system of the field such as cement, iron and steel roll-type coal pulverizer, this new coal pulverizer hydraulic loading system includes mair motor
And duplex gear pump, described mair motor drive duplex gear pump is to system offer hydraulic oil, described novel coal mill hydraulic loaded
System also includes loading loop, backpressure circuit, oil return filter system and inherent filtration system, described mair motor, duplex gear pump, plus
Carry loop, backpressure circuit, oil return filter system and inherent filtration system to connect by pipeline.
Preferably, described loading loop includes loading check valve, loads proportional pressure control valve, on-load pressure table, the first pressure
Power transmitter, second pressure transmitter, the first loading accumulator, the second loading accumulator, the 3rd loading accumulator, the first loading
Oil cylinder, the second load cylinder and the 3rd load cylinder.
In any of the above-described technical scheme preferably, described backpressure circuit includes back pressure check valve, the first check valve, the back of the body
Pressure proportional pressure control valve, back-pressure table, the first raising speed adjust flow valve, the second raising speed adjusts flow valve, the 3rd raising speed adjusts stream
Amount valve, first reduction of speed adjust flow valve, second reduction of speed adjust flow valve, the 3rd reduction of speed adjust flow valve, the first back pressure relief valve,
Second back pressure relief valve, the 3rd back pressure relief valve, the first back pressure accumulator, the second back pressure accumulator and the 3rd back pressure accumulator.
In any of the above-described technical scheme preferably, described oil return filter system include the second check valve, cooler and
Bitubular return filter.
In any of the above-described technical scheme preferably, described first raising speed adjusts flow valve, the first reduction of speed adjusts flow
Valve, the first load cylinder are connected by pipeline, the two ends of described first load cylinder be respectively configured the first loading accumulator and
First back pressure accumulator.
In any of the above-described technical scheme preferably, described first back pressure relief valve is arranged at the first reduction of speed and adjusts flow
On the connecting line of valve and the first load cylinder.
In any of the above-described technical scheme preferably, described second raising speed adjusts flow valve, the second reduction of speed adjusts flow
Valve, the second load cylinder are connected by pipeline, the two ends of described second load cylinder be respectively configured the second loading accumulator and
Second back pressure accumulator.
In any of the above-described technical scheme preferably, described second back pressure relief valve is arranged at the second reduction of speed and adjusts flow
On the connecting line of valve and the second load cylinder.
In any of the above-described technical scheme preferably, described 3rd raising speed adjusts flow valve, the 3rd reduction of speed adjusts flow
Valve, the 3rd load cylinder are connected by pipeline, the two ends of described 3rd load cylinder be respectively configured the 3rd loading accumulator and
3rd back pressure accumulator.
In any of the above-described technical scheme preferably, described 3rd back pressure relief valve is arranged at the 3rd reduction of speed and adjusts flow
On the connecting line of valve and the 3rd load cylinder.
In any of the above-described technical scheme preferably, described loading loop is connected with duplex gear pump, described loading
The hydraulic oil in loop is entered by the high-pressure pump in duplex gear pump and loads loop.
In any of the above-described technical scheme preferably, one end of described first check valve connects duplex gear pump, described
The other end of the first check valve connects the first load cylinder, the second load cylinder and the 3rd load cylinder and enters the liquid loading loop
Force feed, through the first check valve, enters having of the first load cylinder, the second load cylinder and the 3rd load cylinder by external pipe
Rod cavity.
In any of the above-described technical scheme preferably, described loading proportional pressure control valve is arranged on loading check valve, loading
On pressure gauge, the connecting line of second pressure transmitter, pressure oil is when exceeding set pressure through proportional pressure control valve overflow and lead to
Cross the second check valve, cooler, return filter connecting line pass back into fuel tank.
In any of the above-described technical scheme preferably, described backpressure circuit is connected with duplex gear pump, described back pressure
The hydraulic oil in loop enters backpressure circuit by the low-lift pump in duplex gear pump.
In any of the above-described technical scheme preferably, one end of described back pressure check valve connects duplex gear pump, described
The other end of back pressure check valve connects the first raising speed and adjusts flow valve, the second raising speed regulation flow valve, the 3rd raising speed regulation flow
Valve and the first reduction of speed adjust flow valve, the second reduction of speed adjusts flow valve, the 3rd reduction of speed adjusts flow valve, enter the by external pipe
One load cylinder, the second load cylinder, the rodless cavity of the 3rd load cylinder.
In any of the above-described technical scheme preferably, described back pressure proportional pressure control valve is arranged on back pressure check valve, back pressure
On pressure gauge, the connecting line of first pressure transmitter, pressure oil is when exceeding set pressure through proportional pressure control valve overflow and lead to
Cross the second check valve, cooler, return filter connecting line pass back into fuel tank.
In any of the above-described technical scheme preferably, described inherent filtration system includes inherent filtration motor, inherent filtration pump, list
To valve and filter.
In any of the above-described technical scheme preferably, described inherent filtration motor, inherent filtration pump, check valve, filter according to
Secondary be connected, the described hydraulic oil in loading loop and/or the hydraulic oil of backpressure circuit are after inherent filtration pump, check valve, filter
Back into fuel tank.
In any of the above-described technical scheme preferably, the filter core precision that described filter adopts is 5u.
Compared with prior art, the technique scheme of the present invention has the advantages that：
1st, this hydraulic loading system is optimized on the basis of the hydraulic system of early stage, simplifies control element, increase
Back pressure function and inherent filtration system, improve the coal adaptability of coal pulverizer and the adaptive capacity to environment of hydraulic system.
2nd, six flow control valves, one load cylinder of two one group correspondence, separate, can be very good to adjust coal-grinding
The lifting of machine grinding roller is synchronous.
3rd, each oil cylinder is equipped with independent loading, back pressure accumulator, can effectively absorb hydraulic shock, reduces shake
Dynamic, improve the stability of a system.
4th, in coal pulverizer, coal seam is excessively thin or ature of coal granularity spy's hour, part can be overcome to grind by improving back pressure
Roller is conducted oneself with dignity, and slows down grinding machine vibration.
5th, system has independent filtration system, improves the maintenance convenience at scene, and filtering accuracy is up to 5u, for a long time
Continual filtration, can effectively improve the hydraulic pressure accuracy in fuel tank, be the guarantee that system operation has improved.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is that the overall system architecture of a preferred embodiment of the novel coal mill hydraulic loading system according to the present invention shows
It is intended to；
Fig. 2 is the system of a preferred embodiment of the novel coal mill hydraulic loading system according to the present invention in normal work
Pipeline connection diagram under state；
Fig. 3 is the system of a preferred embodiment of the novel coal mill hydraulic loading system according to the present invention in a liter grinding roller work
Make the pipeline connection diagram under state；
Fig. 4 is the system of a preferred embodiment of the novel coal mill hydraulic loading system according to the present invention in fall grinding roller work
Make the pipeline connection diagram under state；
Fig. 5 is the inherent filtration system architecture of a preferred embodiment of the novel coal mill hydraulic loading system according to the present invention
Schematic diagram；
Reference：Mair motor 1, duplex gear pump 2, back pressure check valve 3, load check valve 4, the first check valve 5, load
Proportional pressure control valve 6, back pressure proportional pressure control valve 7, back-pressure table 8, on-load pressure table 9, first pressure transmitter 10.1, second is pressed
Power transmitter 10.2, the first raising speed adjusts flow valve 11.1, and the second raising speed adjusts flow valve 11.2, and the 3rd raising speed adjusts flow valve
11.3, the first reduction of speed adjusts flow valve 11.4, and the second reduction of speed adjusts flow valve 11.5, and the 3rd reduction of speed adjusts flow valve 11.6, the
One back pressure relief valve 12.1, the second back pressure relief valve 12.2, the 3rd back pressure relief valve 12.3, the first loading accumulator 13.1, the
Two loading accumulators 13.2, the 3rd loading accumulator 13.3, the first load cylinder 14.1, the second load cylinder 14.2, the 3rd adds
Carry oil cylinder 14.3, the first back pressure accumulator 15.1, the second back pressure accumulator 15.2, the 3rd back pressure accumulator 15.3, second is unidirectional
Valve 16, cooler 17, bitubular return filter 18, inherent filtration motor 19, inherent filtration pump 20, the 3rd check valve 21, filter 22.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
In order to overcome coal pulverizer hydraulic loading system the problems of in the prior art, the embodiment of the present invention proposes one
Plant novel coal mill hydraulic loading system, this novel coal mill hydraulic loading system includes mair motor 1, duplex gear pump 2, loads
Loop, backpressure circuit, oil return filter system and inherent filtration system, mair motor 1 drives duplex gear pump 2 to provide hydraulic pressure to system
Oil, mair motor 1, duplex gear pump 2, loading loop, backpressure circuit, oil return filter system and inherent filtration system are by pipeline even
Connect, below in conjunction with such as Fig. 1, this novel coal mill hydraulic loading system illustrated,
Novel coal mill hydraulic loading system described in the present embodiment, is loaded back into route loading check valve 4, loading ratio is overflow
Stream valve 6, on-load pressure table 9, first pressure transmitter 10.1, second pressure transmitter 10.2, first load accumulator 13.1, the
Two loading accumulators the 13.2, the 3rd loading accumulators 13.3, the first load cylinder 14.1, the second load cylinder 14.2 and the 3rd add
Carry oil cylinder 14.3 to connect and compose.
Novel coal mill hydraulic loading system described in the present embodiment, it is unidirectional that backpressure circuit includes back pressure check valve 3, first
Valve 5, back pressure proportional pressure control valve 7, back-pressure table 8, the first raising speed adjust flow valve 11.1, the second raising speed adjusts flow valve
11.2nd, the 3rd raising speed adjusts flow valve 11.3, the first reduction of speed adjusts flow valve 11.4, the second reduction of speed adjusts flow valve 11.5, the
Three reductions of speed adjust flow valve 11.6, the first back pressure relief valve 12.1, the second back pressure relief valve 12.2, the 3rd back pressure relief valve
12.3rd, the first back pressure accumulator 15.1, the second back pressure accumulator 15.2 and the 3rd back pressure accumulator 15.3 connect and compose.
Novel coal mill hydraulic loading system described in the present embodiment, oil return filter system includes the second check valve 16, cold
But device 17 and bitubular return filter 18.
Novel coal mill hydraulic loading system described in the present embodiment, is loaded loop and is connected with duplex gear pump 2, described
The hydraulic oil loading loop enters loading loop by the high-pressure pump in duplex gear pump 2；One end of first check valve 4 connects duplex
Gear pump 2, the other end of the first check valve 4 connects the first load cylinder 14.1, the second load cylinder 14.2 and the 3rd loads oil
Cylinder 14.3, enters the hydraulic oil loading loop through the first check valve 4, by external pipe enter the first load cylinder 14.1, the
Two load cylinders 14.2 and the rod chamber of the 3rd load cylinder 14.3；Load proportional pressure control valve 6 to be arranged on loading check valve 4, add
On load pressure gauge 9, the connecting line of second pressure transmitter 10.2, pressure oil is when exceeding set pressure through proportional pressure control valve 7
Overflow simultaneously passes back into fuel tank by the second check valve 16, cooler 17, return filter 18 connecting line；Backpressure circuit and duplex
Gear pump 2 is connected, and the hydraulic oil of backpressure circuit enters backpressure circuit by the low-lift pump in duplex gear pump 2；Back pressure check valve 3
One end connect duplex gear pump 2, the other end of described back pressure check valve 3 connects the first raising speed and adjusts flow valve 11.1, second
Raising speed adjusts flow valve 11.2, the 3rd raising speed adjusts flow valve 11.3 and the first reduction of speed adjusts flow valve 11.4, the second reduction of speed is adjusted
Amount of restriction valve 11.5, the 3rd reduction of speed adjust flow valve 11.6, enter the first load cylinder 14.1, second by external pipe and load oil
Cylinder 14.2, the rodless cavity of the 3rd load cylinder 14.3；Back pressure proportional pressure control valve 7 be arranged on back pressure check valve 3, back-pressure table 8,
On the connecting line of first pressure transmitter 10.1, pressure oil is when exceeding set pressure through proportional pressure control valve 7 overflow and pass through
Second check valve 16, cooler 17, return filter 18 connecting line pass back into fuel tank.
Novel coal mill hydraulic loading system described in the present embodiment, is equipped with independent inherent filtration system, inherent filtration system
System is connected and composed by inherent filtration motor 19, inherent filtration pump 20, check valve 21 and filter 22.Load loop hydraulic oil and/or
The hydraulic oil of backpressure circuit backs into fuel tank after inherent filtration pump 20, check valve 21, filter 22.
Novel coal mill hydraulic loading system described in the present embodiment, the filter core that the filter 22 of inherent filtration system adopts is smart
Degree is up to 5u.
Novel coal mill hydraulic loading system described in the present embodiment, system is provided with six flow control valves, two one
The corresponding load cylinder of group, separate and to control to adjust grinding roller lifting synchronous：First raising speed adjusts flow valve 11.1, first
Reduction of speed adjusts flow valve 11.4, the first load cylinder 14.1 is connected by pipeline, and the two ends of the first load cylinder 14.1 are respectively
Configuration first loads accumulator 13.1 and the first back pressure accumulator 15.1；First back pressure relief valve 12.1 is arranged at the first reduction of speed and adjusts
On the connecting line of amount of restriction valve 11.4 and the first load cylinder 14.1；Second raising speed adjust flow valve 11.2, second reduction of speed adjust
Amount of restriction valve 11.5, the second load cylinder 14.2 are connected by pipeline, and the two ends of the second load cylinder 14.2 are respectively configured
Two load accumulator 13.2 and the second back pressure accumulator 15.2；Second back pressure relief valve 12.2 is arranged at the second reduction of speed and adjusts flow
On the connecting line of valve 11.5 and the second load cylinder 14.2；3rd raising speed adjusts flow valve 11.3, the 3rd reduction of speed adjusts flow
Valve 11.6, the 3rd load cylinder 14.3 are connected by pipeline, and the two ends of the 3rd load cylinder 14.3 are respectively configured the 3rd loading
Accumulator 13.3 and the 3rd back pressure accumulator 15.3；3rd back pressure relief valve 12.3 is arranged at the 3rd reduction of speed and adjusts flow valve 11.6
On the connecting line of the 3rd load cylinder 14.3.
The novel coal mill hydraulic loading system of the present embodiment, can extensively apply coal electricity, chemical industry, cement, iron and steel, etc. row
Industry, system is made up of parts such as hydraulic oil pumping plant, load cylinder, loading accumulator, back pressure accumulator, oil pipe lines, by loading
The pull bar of cylinder piston rod and coal pulverizer connects, thus hydraulic coupling is passed to coal pulverizer, provides satisfactory grinding forces.With
Lower combination Fig. 1 to Fig. 5 to the novel coal mill hydraulic loading system of the present embodiment, say by the working condition under different operating modes
Bright.
As shown in Fig. 2 normal operating conditions：
Load loop hydraulic oil and loading loop is entered by the high-pressure pump in duplex gear pump 2, through loading check valve 4, by
External pipe enters load cylinder 14.1,14.2,14.3 rod chamber, sets up pressure in rod chamber, and by the work of load cylinder
Stopper rod passes to the grinding roller of coal pulverizer hydraulic coupling, is converted into grinding forces；On-load pressure is adjusted by loading proportional pressure control valve 6
Fixed, adjust pressure in 0-15MPa, real-time online regulation is carried out by control room DCS according to pulverizer capacity, exceedes proportional pressure control valve
During 6 set pressure, through proportional pressure control valve 6 overflow, by check valve 16, cooler 17, return filter 18 backs into oil to pressure oil
Case.The pressure fluctuation loading the generation in loop is slowed down by loading accumulator 13.1,13.2,13.3 absorption.
Backpressure circuit hydraulic oil enters backpressure circuit by the low-lift pump in duplex gear pump 2, and through check valve 3, flow controls
Valve 11.1,11.2,11.3,11.4,11.5,11.6, enters load cylinder rodless cavity by external pipe, sets up pressure in rodless cavity
Power, and by the piston rod of load cylinder, hydraulic coupling is passed to the grinding roller of coal pulverizer, offset a part of grinding forces；Back-pressure
Set up by back pressure proportional pressure control valve 7, adjust pressure in 0-3MPa, carried out by control room DCS according to pulverizer capacity situation
Real-time online adjust, when exceeding proportional pressure control valve 7 set pressure, pressure oil through proportional pressure control valve 7 overflow, by check valve 16,
Cooler 17, return filter 18 backs into fuel tank.The pressure fluctuation of the generation in backpressure circuit by load accumulator 15.1,
15.2nd, 15.3 absorptions slow down.
As shown in figure 3, rising grinding roller state：
Loading loop proportional pressure control valve 6 set pressure is 0, loads loop hydraulic oil by the high-pressure pump in duplex gear pump 2
Enter and load loop, through loading check valve 4, load proportional pressure control valve stream valve 6, check valve 16, cooler 17, return filter
18 back into fuel tank.
Backpressure circuit hydraulic oil enters backpressure circuit by the low-lift pump in duplex gear pump 2, and through check valve 3, flow controls
Valve 11.1,11.2,11.3,11.4,11.5,11.6, enters load cylinder rodless cavity by external pipe, sets up pressure in rodless cavity
Power, and by the piston rod of load cylinder, hydraulic coupling is passed to the grinding roller of coal pulverizer, hydraulic coupling overcomes the equipment self-weights such as grinding roller
Afterwards, grinding roller lifts；Back-pressure is set up by back pressure proportional pressure control valve 7, adjusts pressure in 5-8MPa, exceedes proportional pressure control valve
During 7 set pressure, through proportional pressure control valve 7 overflow, by check valve 16, cooler 17, return filter 18 backs into oil to pressure oil
Case.Rise roller speed to be controlled by flow control valve 11.1,11.2,11.3.
As shown in figure 4, fall grinding roller state：
Loading loop proportional pressure control valve 6 set pressure is 0, loads loop hydraulic oil by the high-pressure pump in duplex gear pump 2
Enter and load loop, through loading check valve 4, load proportional pressure control valve stream valve 6, check valve 16, cooler 17, return filter
18 back into fuel tank.
Backpressure circuit hydraulic oil enters backpressure circuit by the low-lift pump in duplex gear pump 2, and through check valve 3, flow controls
Valve 11.1,11.2,11.3,11.4,11.5,11.6, enters load cylinder rodless cavity by external pipe, sets up pressure in rodless cavity
Power, and by the piston rod of load cylinder, hydraulic coupling is passed to the grinding roller of coal pulverizer, hydraulic coupling is less than the equipment self-weights such as grinding roller
Afterwards, grinding roller declines；Back-pressure is set up by back pressure proportional pressure control valve 7, adjusts pressure in 3-4MPa, exceedes proportional pressure control valve
During 7 set pressure, through proportional pressure control valve 7 overflow, by check valve 16, cooler 17, return filter 18 backs into oil to pressure oil
Case.Fall roller speed is controlled by flow control valve 11.4,11.5,11.6.
As shown in figure 5, inherent filtration system：
Hydraulic oil backs into fuel tank after gear pump 20, check valve 21, filter 22.Filter element precision is up to 5u, with
One piece of operation of loading system, the impurity within high-efficient cleaning oil removal box, improve the cleannes of hydraulic oil.
The novel coal mill hydraulic loading system of the present embodiment, its system features：
The technical scheme of the present embodiment is optimized with respect to prior art, simplifies control element, increased back pressure
Function and inherent filtration system, improve the coal adaptability of coal pulverizer and the adaptive capacity to environment of hydraulic system；Six flows
Control valve, one load cylinder of two one group correspondence, separate, the lifting that can be very good to adjust Roller of Coal Grinder is synchronous；
Each oil cylinder is equipped with independent loading, back pressure accumulator, can effectively absorb hydraulic shock, reduces vibrations, improves system
Stability；In coal pulverizer, coal seam is excessively thin or ature of coal granularity spy's hour, can by improving back pressure, overcome part grinding roller from
Weight, slows down grinding machine vibration；System has independent filtration system, improves the maintenance convenience at scene, and filtering accuracy is up to 5u,
Continual filtration for a long time, can effectively improve the hydraulic pressure accuracy in fuel tank, be the guarantee that system operation has improved.
The above is only that the preferred embodiment of the present invention is described, and is not that the scope of the present invention is limited
Fixed, on the premise of without departing from design spirit of the present invention, this area ordinary skill technical staff makees to technical scheme
The various modifications going out and improvement, all should fall in the protection domain of claims of the present invention determination.
Claims (10)
1. a kind of novel coal mill hydraulic loading system, including mair motor（1）And duplex gear pump（2）, described mair motor（1）Band
Dynamic duplex gear pump（2）To system provide hydraulic oil it is characterised in that：Described novel coal mill hydraulic loading system also includes adding
Carry loop, backpressure circuit, oil return filter system and inherent filtration system, described mair motor（1）, duplex gear pump（2）, be loaded back into
Road, backpressure circuit, oil return filter system and inherent filtration system are connected by pipeline.
2. novel coal mill hydraulic loading system as claimed in claim 1 it is characterised in that：Described loading loop includes loading
Check valve（4）, load proportional pressure control valve（6）, on-load pressure table（9）, first pressure transmitter（10.1）, second pressure transmitter
（10.2）, first loading accumulator（13.1）, second loading accumulator（13.2）, the 3rd loading accumulator（13.3）, first plus
Carry oil cylinder（14.1）, the second load cylinder（14.2）With the 3rd load cylinder（14.3）.
3. novel coal mill hydraulic loading system as claimed in claim 1 it is characterised in that：Described backpressure circuit includes back pressure
Check valve（3）, the first check valve（5）, back pressure proportional pressure control valve（7）, back-pressure table（8）, first raising speed adjust flow valve
（11.1）, second raising speed adjust flow valve（11.2）, the 3rd raising speed adjust flow valve（11.3）, first reduction of speed adjust flow valve
（11.4）, second reduction of speed adjust flow valve（11.5）, the 3rd reduction of speed adjust flow valve（11.6）, the first back pressure relief valve
（12.1）, the second back pressure relief valve（12.2）, the 3rd back pressure relief valve（12.3）, the first back pressure accumulator（15.1）, second the back of the body
Pressure accumulator（15.2）With the 3rd back pressure accumulator（15.3）.
4. novel coal mill hydraulic loading system as claimed in claim 1 it is characterised in that：Described oil return filter system includes
Second check valve（16）, cooler（17）With bitubular return filter（18）.
5. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described first raising speed adjusts flow
Valve（11.1）, first reduction of speed adjust flow valve（11.4）, the first load cylinder（14.1）It is connected by pipeline, described first adds
Carry oil cylinder（14.1）Two ends be respectively configured the first loading accumulator（13.1）With the first back pressure accumulator（15.1）.
6. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described first back pressure relief valve
（12.1）It is arranged at the first reduction of speed and adjust flow valve（11.4）With the first load cylinder（14.1）Connecting line on.
7. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described second raising speed adjusts flow
Valve（11.2）, second reduction of speed adjust flow valve（11.5）, the second load cylinder（14.2）It is connected by pipeline, described second adds
Carry oil cylinder（14.2）Two ends be respectively configured the second loading accumulator（13.2）With the second back pressure accumulator（15.2）.
8. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described second back pressure relief valve
（12.2）It is arranged at the second reduction of speed and adjust flow valve（11.5）With the second load cylinder（14.2）Connecting line on.
9. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described 3rd raising speed adjusts flow
Valve（11.3）, the 3rd reduction of speed adjust flow valve（11.6）, the 3rd load cylinder（14.3）It is connected by pipeline, the described 3rd adds
Carry oil cylinder（14.3）Two ends be respectively configured the 3rd loading accumulator（13.3）With the 3rd back pressure accumulator（15.3）.
10. novel coal mill hydraulic loading system as claimed in claim 3 it is characterised in that：Described 3rd back pressure relief valve
（12.3）It is arranged at the 3rd reduction of speed and adjust flow valve（11.6）With the 3rd load cylinder（14.3）Connecting line on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827558.6A CN106438553A (en) | 2016-09-17 | 2016-09-17 | Novel hydraulic loading system for coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827558.6A CN106438553A (en) | 2016-09-17 | 2016-09-17 | Novel hydraulic loading system for coal mill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112044532A (en) * | 2019-06-05 | 2020-12-08 | 莱歇研磨机械制造(上海)有限公司 | Roller mill with hydraulic loading and adjusting system |
| CN113713957A (en) * | 2021-08-12 | 2021-11-30 | 杭州意能电力技术有限公司 | Self-starting control method for coal pulverizing system of medium-speed roller coal mill configured for thermal power generating unit |
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| CN112044532A (en) * | 2019-06-05 | 2020-12-08 | 莱歇研磨机械制造(上海)有限公司 | Roller mill with hydraulic loading and adjusting system |
| CN113713957A (en) * | 2021-08-12 | 2021-11-30 | 杭州意能电力技术有限公司 | Self-starting control method for coal pulverizing system of medium-speed roller coal mill configured for thermal power generating unit |
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Application publication date: 20170222 |