CN103912528B - Calcium carbonate dry grinding hydraulic system and control method thereof - Google Patents
Calcium carbonate dry grinding hydraulic system and control method thereof Download PDFInfo
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- CN103912528B CN103912528B CN201410127535.5A CN201410127535A CN103912528B CN 103912528 B CN103912528 B CN 103912528B CN 201410127535 A CN201410127535 A CN 201410127535A CN 103912528 B CN103912528 B CN 103912528B
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Abstract
The present invention provides a kind of calcium carbonate dry grinding hydraulic system and control method thereof, and this calcium carbonate dry grinding hydraulic system includes fuel tank, oil pump, hydraulic cylinder, mill, the first reversal valve, the second reversal valve, the 3rd reversal valve and pressure transducer；First reversal valve and the second reversal valve are connected between oil pump and hydraulic cylinder, so that oil pump selectively the first cavity fuel feeding to hydraulic cylinder or the second cavity fuel feeding to hydraulic cylinder；When oil pump makes mill decline to the second cavity fuel feeding, the real-time pressure measurement of pressure transducer, when institute's measuring pressure is less than upper limit set value, the first coil of the first reversal valve obtain electric make mill continue decline, when institute's measuring pressure is more than upper limit set value, the first coil dead electricity of the first reversal valve, to play stopping pressurization, when institute's measuring pressure is less than lower limit set value, the first coil of the first reversal valve obtain electric make mill continue decline, to play ftercompction effect, when institute's measuring pressure is more than lower limit set value, mill is in packing state.
Description
Technical field
The present invention relates to pulp technology for making paper, particularly to a kind of calcium carbonate dry grinding hydraulic system and
Control method.
Background technology
Ground calcium carbonate is one of indispensable filler in paper technology.Ground calcium carbonate is Dali
Stone is size-reduced, dry grind, steep after the techniques such as slurry, wet grinding for papermaking technology, in dry grinding system, and mill
The rising of dish, decline are all by HYDRAULIC CONTROL SYSTEM, and in process of lapping, mill to keep certain
Down force pressure, it is ensured that mill completely attaches to raw material, mill rotates, thus by the stone of φ 45mm
Block grinds to form the powdered granule about 400 mesh.
In existing dry grinding hydraulic pressure holding pressure control technology, lower piezoelectric magnet valve is electricly, by pilot-operated type eternal
Overflow valve maintains pressure, and simultaneity factor has a hydraulic pressure to push down the mill (shape pressurizeed all the time always
State is run), the limitation of this hydraulic system is that mill pressure modulability is poor, when feeding uneven,
Cannot regulate mill pressure in time, abrasive disk abrasion is serious, and main frame current fluctuation simultaneously is big, works as main frame
When motor current exceedes protection setting value, main frame converter is understood overload protection and is caused equipment downtime,
Affect production efficiency.
Summary of the invention
The present invention provides a kind of calcium carbonate dry grinding hydraulic system and control method thereof, to solve existing skill
Because of mill pressure regulation poor-performing in art, it is easily caused main frame converter meeting overload protection and causes setting
Standby shutdown, the problem affecting production efficiency.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of carbon
Acid calcium dry grinding hydraulic system, including:
Fuel tank, oil pump, described hydraulic cylinder, mill, the first reversal valve, the second reversal valve, the 3rd
Reversal valve and pressure transducer；
Wherein, described hydraulic cylinder includes cylinder body, piston and piston rod, and described piston is by described cylinder
Body is divided into the first cavity and the second cavity, described piston rod and described piston and connects, described piston
Oil pressure based on described first cavity and described second cavity produces displacement and makes described piston rod band
Dynamic described mill rises or falls；
Wherein, described first reversal valve and described second reversal valve are connected to described oil pump and described liquid
Between cylinder pressure, so that described oil pump is selectively to described first cavity fuel feeding or to described second cavity
Fuel feeding；
Wherein, when described oil pump makes described mill decline to described second cavity fuel feeding, described
The real-time pressure measurement of pressure transducer,
First, when institute's measuring pressure is less than upper limit set value, the first coil of described first reversal valve
Described mill electric must be made to continue to decline,
Secondly, during until institute's measuring pressure is more than upper limit set value, the First Line of described first reversal valve
Circle dead electricity, described oil pump stops to described second cavity fuel feeding, to play stopping pressurization,
Then, during until institute's measuring pressure is less than lower limit set value, the First Line of described first reversal valve
Enclosing electric to make described mill continue to decline, described oil pump continues to described second cavity fuel feeding, with
Play ftercompction effect,
Finally, during until institute's measuring pressure is more than described lower limit set value, described mill is in pressurize shape
State.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes that pressure continues
Electrical equipment, when described mill declines, described pressure switch is higher than at the oil pressure of described second cavity
Control described 3rd reversal valve during the oil pressure that described pressure switch sets to commutate to carry out release.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes overflow
Valve, described overflow valve is connected in hydraulic circuit, for controlling the input pressure of described hydraulic cylinder.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes board-like list
To valve, described plate-type non-return valve is connected between described oil pump and described first reversal valve.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes hydraulic control list
To valve, described hydraulic control one-way valve is connected between described second reversal valve and described second cavity.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes accumulation of energy
Device, described accumulator is connected with described second cavity.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes cooling
Device, described cooler is connected between described hydraulic cylinder and fuel tank, for cooling work oil return.
According to one preferred embodiment of the present invention, described calcium carbonate dry grinding hydraulic system also includes that oil suction is filtered
Oil device and return oil filter, described oil-suction oil filter is connected between described oil pump and described fuel tank,
Described return oil filter is connected between described cooler and described fuel tank.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide one
The control method of calcium carbonate dry grinding hydraulic system, the control method of described calcium carbonate dry grinding hydraulic system
Carry out based on above-mentioned calcium carbonate dry grinding hydraulic system, comprise the following steps:
Start described calcium carbonate dry grinding hydraulic system；
Whether detect described mill high spacing；
If described mill high spacing, does not then control the second coil and the institute of described first reversal valve
State the second reversal valve to obtain and electric make described mill increase, described mill is promoted paramount height spacing；
If described mill is in high spacing, then the first coil controlling described first reversal valve obtains electric
Described mill is declined；
Starting main frame motor makes described mill rotate；
The real-time pressure measurement when described mill declines of described pressure transducer；
First, when institute's measuring pressure is less than described upper limit set value, then described first reversal valve is controlled
First coil obtain electric make described mill continue decline；
Secondly, during until institute's measuring pressure is more than described upper limit set value, then control described first commutation
The first coil dead electricity of valve, described oil pump stops to described second cavity fuel feeding, adds playing stopping
Pressure effect,
Then, during until institute's measuring pressure is less than described lower limit set value, then control described first commutation
The first coil of valve obtain electric make described mill continue decline, described oil pump continue to described second chamber
Body fuel feeding, to play ftercompction effect,
Finally, until when institute's measuring pressure is more than described lower limit set value, described mill is in pressurize
State.
According to one preferred embodiment of the present invention, the step at described startup main frame motor, mill being rotated
After Zhou, further comprise the steps of:
Described pressure switch sets higher than described pressure switch at the oil pressure of described second cavity
Oil pressure time control described 3rd reversal valve commutate to carry out release.
The invention has the beneficial effects as follows: be different from the situation of prior art, the carbonic acid that the present invention provides
Calcium dry grinding hydraulic system and control method thereof pass through pressure transducer real-time pressure measurement when mill declines,
Relativeness according to institute's measuring pressure with lower limit set value and upper limit set value carries out Intelligent adjustment, makes
Obtain emery wheel to work under voltage stabilizing state, there is automatic compensation and over-voltage protecting function so that dry grinding liquid
Pressure system is run more stable, alleviates abrasive disk abrasion simultaneously, overcomes the uneven main frame electricity caused of charging
Stream fluctuation, it is to avoid main frame converter is understood overload protection and caused equipment downtime, improves production efficiency.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, embodiment will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below
It is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is that the element of calcium carbonate dry grinding hydraulic system according to one preferred embodiment of the present invention connects
Schematic diagram；
Fig. 2 is calcium carbonate dry grinding hydraulic system control method according to one preferred embodiment of the present invention
Schematic flow sheet；
Fig. 3 is simplification control module schematic diagram according to one preferred embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention
It is clearly and completely described, it is clear that described embodiment is only that the part of the present invention is real
Execute example rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into this
The scope of invention protection.
Referring to Fig. 1, Fig. 1 is calcium carbonate dry grinding hydraulic pressure system according to one preferred embodiment of the present invention
The element connection diagram of system.
As it is shown in figure 1, the calcium carbonate dry grinding hydraulic system that one embodiment of the present invention provides is main
Commutate including fuel tank 20, oil pump 5, hydraulic cylinder 31, mill the 32, first reversal valve 12, second
Valve the 14, the 3rd reversal valve 16 and pressure transducer 11.
Hydraulic cylinder 31 includes cylinder body 311, piston 312 and piston rod 315, and piston 312 is by cylinder
Body 311 is divided into the first cavity 316 and the second cavity 317, one end of piston rod 315 and piston
312 connect, and the other end and the mill 32 of piston rod 315 connect, and piston 312 is based on the first cavity
316 and second cavity 317 oil pressure produce displacement make piston rod 315 band movable grinding disc 32 increase or
Decline.
Wherein, the first reversal valve 12 and the second reversal valve 14 are connected to oil pump 5 and hydraulic cylinder 31
Between, so that oil pump 5 is selectively to the first cavity 316 fuel feeding or to the second cavity 317 fuel feeding.
Specifically, the first reversal valve 12 includes first coil YV01 and the second coil YV02, the
When one coil YV01 obtains electric, the first reversal valve 12 is in intersecting bilateral state, i.e. PB mouth communicates,
AT mouth communicates, when the second coil YV02 obtains electric, the first reversal valve 12 in parallel bilateral state,
I.e. PA mouth communicates, and BT mouth communicates.In the present embodiment, the A mouth of the second reversal valve 14 is arranged to
Oil circuit end, the coil YV04 of the second reversal valve 14 must not electricity time BT mouth communicate, second commutation
When the coil YV04 of valve 14 obtains electric, PB mouth communicates.
When oil pump 5 makes mill 32 decline to the second cavity 317 fuel feeding, pressure transducer 11
Pressure measurement in real time, when institute's measuring pressure is less than upper limit set value, the first coil of the first reversal valve 12
Electric make mill 32 continue decline, when institute's measuring pressure more than upper limit set value time, first commutation
The first coil dead electricity of valve 12, oil pump 5 stops to the second cavity 317 fuel feeding, to play stopping
Pressurization, when institute's measuring pressure is less than lower limit set value, the first coil of the first reversal valve 12
Mill 32 electric must be made to continue to decline, and oil pump 5 continues to the second cavity 317 fuel feeding, to play
Ftercompction effect, when institute's measuring pressure is more than lower limit set value, mill 32 is in packing state.
Wherein, oil pump 5 is driven by motor 6.Pressure transducer 11 can be in system circuit
Multiple positions measure, PT 11.1 and PT 11.2 as shown in Figure 1.
Additionally, the calcium carbonate dry grinding hydraulic system that the preferred embodiment of the present invention provides also includes that pressure continues
Electrical equipment 13, overflow valve 8, plate-type non-return valve 7, hydraulic control one-way valve 15, accumulator 19, cooler
9, oil-suction oil filter 1, return oil filter 2, liquid temperature liquidometer 3, air filter 4, safety
Valve 17 and high-pressure ball valve 18.
When mill 32 declines, pressure switch 13 is higher than pressure at the oil pressure of the second cavity 317
The coil YV03 controlling the 3rd reversal valve 16 during the oil pressure that relay 13 sets obtains electric commutation to enter
Row release.Specifically, in the present embodiment, the A mouth of the 3rd reversal valve 16 is arranged to oil circuit cut-off,
The coil YV03 of the 3rd reversal valve 16 must not electricity time BT mouth communicate, the line of the 3rd reversal valve 16
When circle YV03 obtains electric, PB mouth communicates.
Overflow valve 8 is connected in hydraulic circuit, for controlling the input pressure of hydraulic cylinder 31.Its
In, overflow valve 8 can be arranged the multiple positions in system circuit, overflow valve as shown in Figure 1
8.1, overflow valve 8.2.
Plate-type non-return valve 7 is connected between oil pump 5 and the first reversal valve 12, to ensure way flow
Logical, and back pressure is provided.
Hydraulic control one-way valve 15 is connected between the second reversal valve 14 and the second cavity 317, to ensure
One-way flow, and back pressure is provided.
Accumulator 19 is connected with the second cavity 317, to store system capacity.
Cooler 9 is connected between hydraulic cylinder 31 and fuel tank 20, for cooling work oil return.
Oil-suction oil filter 1 is connected between oil pump 5 and fuel tank 20, and return oil filter 2 is connected to
Between cooler 9 and fuel tank 20, it is used for filtering working oil.Liquid temperature liquidometer 3 is used for measuring liquid
The temperature of force feed and liquid level.Air filter 4 plays air filtration effect, prevents the dust in air
Enter fuel tank, contaminated liquid force feed, affect each element manipulation of hydraulic system.Relief valve 17 plays peace
Full guard effect.High-pressure ball valve 18 is for using when maintenance is drained the oil.
It is briefly described and combines Fig. 1 to illustrate that the present invention is preferable to carry out below in conjunction with above element
The operation principle of the calcium carbonate dry grinding hydraulic system that example provides.
1, system pressure is set up
After motor 6 drives oil pump 5 operating, hydraulic oil enters oil pump 5 through inlet port filter 1
Inlet port, then by oil pump 5 oil drain out discharge, be supplied to system, system through plate-type non-return valve 7
Pressure is set by overflow valve 8.1.
2, mill 32 rises control
When the second coil YV02 of the first reversal valve 12 obtains electric, the second reversal valve 14 simultaneously
Coil YV04 obtains electric, and hydraulic control one-way valve 15 is opened, and the PA mouth of the first reversal valve 12 communicates,
BT mouth communicates, and hydraulic oil enters the first cavity 316 of hydraulic cylinder 31 through PA mouth so that mill
32 rise, and overflow valve 8.3 controls the input pressure of hydraulic cylinder 31, meanwhile, hydraulic cylinder 31
The hydraulic oil of the second cavity 317 flow back to fuel tank through BT mouth, cooler 9 and return oil filter 2
20。
3, mill 32 declines control
When first coil YV01 of the first reversal valve 12 obtains electric, the PB of the first reversal valve 12
Mouth communicates, and AT mouth communicates, and hydraulic oil enters the second cavity 317 of hydraulic cylinder 31 through PB mouth, makes
Mill 32 declines, meanwhile, hydraulic oil from the first cavity 316 of hydraulic cylinder 31 through AT mouth, cold
But device 9 and return oil filter 2 flow back to fuel tank 20.If the second cavity 317 oil pressure continues higher than pressure
The setting pressure of electrical equipment 13, pressure switch 13 sends signal, the coil of the 3rd reversal valve 16
YV03 obtains electric, carries out system release, and system is shielded by this design.
4, mill 32 declines pressure holding function
When mill is pressed for 32 times, pressure transducer PT 11.1 detects down force pressure, and by signal
4-20mA passes to DCS (Distributed Control System, dcs), 4-20mA
Corresponding engineering range is 0-250Bar.When pressure is more than 75Bar, the first reversal valve 12
First coil YV01 dead electricity, the first coil of the first reversal valve 12 when pressure is less than 65Bar
YV01 obtains electric, so that system plays pressure maintaining effect.Pressurize scope is adjustable according to actual condition,
It is set usually by operator at DCS: 60Bar-80Bar.
Seeing also Fig. 2, Fig. 2 is calcium carbonate dry grinding liquid according to one preferred embodiment of the present invention
The schematic flow sheet of pressure system control method.
The control method of the calcium carbonate dry grinding hydraulic system that the preferred embodiment of the present invention provides is based on upper
The calcium carbonate dry grinding hydraulic system stated is carried out, and comprises the following steps:
101, start calcium carbonate dry grinding hydraulic system；
102, whether detection mill 32 is high spacing；
103,104, if mill 32 is not high spacing, then control the second of the first reversal valve 12
The coil YV04 of coil YV02 and the second reversal valve 14 obtains and electric makes mill 32 increase, will mill
It is spacing that dish 32 promotes paramount height；
105, if mill 32 is in high spacing, then control the first coil of the first reversal valve 12
YV01 obtains and electric mill 32 is declined；
106, start main frame motor and mill 32 is rotated；
107, pressure transducer 11 is real-time pressure measurement when mill 32 declines；
When institute's measuring pressure is less than upper limit set value, then returns step 105, i.e. control the first commutation
First coil YV01 of valve 12 obtain electric make mill 32 continue decline；
108, when institute's measuring pressure is more than upper limit set value, then control the first of the first reversal valve 12
Coil YV01 dead electricity, oil pump 5 stops to the second cavity 317 fuel feeding, to play stopping pressurization work
With,
109, when institute's measuring pressure is less than lower limit set value, then returns step 105, i.e. control first
First coil YV01 of reversal valve 12 obtain electric make mill 32 continue decline, oil pump 5 continue to
Second cavity 317 fuel feeding, to play ftercompction effect,
110, when institute's measuring pressure is more than lower limit set value, mill 32 is in packing state.
Additionally, in step 106, after i.e. startup main frame motor makes the step that mill 32 rotates,
Further comprise the steps of:
111, pressure switch 13 sets higher than pressure switch 13 at the oil pressure of the second cavity 317
Oil pressure time control the 3rd reversal valve 16 commutate to carry out release.
Seeing also Fig. 3, Fig. 3 is simplification control module according to one preferred embodiment of the present invention
Schematic diagram.
As it is shown on figure 3, system is controlled by PLC (programmable logic controller (PLC) system), PLC receives
Lower limit set value that operator inputs at OS (active station) and upper limit set value, and receive pressure
The detection signal of sensor 11 and pressure switch 13, then output control signal control first is changed
To first coil YV01 of valve 12, carry out the step-down operation of correspondence.
In sum, it should be readily apparent to one skilled in the art that what the present invention that the present invention provides provided
Calcium carbonate dry grinding hydraulic system and control method thereof are real-time when mill declines by pressure transducer
Pressure measurement, carries out intelligence tune according to the relativeness of institute's measuring pressure with lower limit set value and upper limit set value
Joint so that emery wheel works under voltage stabilizing state, has automatic compensation and over-voltage protecting function so that
Dry grinding hydraulic system is run more stable, alleviates abrasive disk abrasion simultaneously, overcomes that charging is uneven to be caused
Main frame current fluctuation, it is to avoid main frame converter is understood overload protection and caused equipment downtime, improves and produces
Efficiency.
These are only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or equivalence flow process conversion that description of the invention and accompanying drawing content made, or directly
Or indirectly it is used in other relevant technical fields, the most in like manner it is included in the patent protection model of the present invention
In enclosing.
Claims (10)
1. a calcium carbonate dry grinding hydraulic system, it is characterised in that including:
Fuel tank (20), oil pump (5), hydraulic cylinder (31), mill (32), the first reversal valve (12),
Second reversal valve (14), the 3rd reversal valve (16) and pressure transducer (11)；
Wherein, described hydraulic cylinder (31) includes cylinder body (311), piston (312) and piston
Bar (315), described cylinder body (311) is divided into the first cavity (316) by described piston (312)
Connect with the second cavity (317), described piston rod (315) and described piston (312), described
Piston (312) is based on described first cavity (316) and the oil pressure of described second cavity (317)
Producing displacement makes described piston rod (315) drive described mill (32) to rise or fall；
Wherein, described first reversal valve (12) and described second reversal valve (14) are connected to described
Between oil pump (5) and described hydraulic cylinder (31), so that described oil pump (5) is selectively to described
First cavity (316) fuel feeding or to described second cavity (317) fuel feeding；
Wherein, described mill is made at described oil pump (5) to described second cavity (317) fuel feeding
(32) when declining, described pressure transducer (11) pressure measurement in real time,
First, when institute's measuring pressure is less than upper limit set value, the of described first reversal valve (12)
One coil obtain electric make described mill (32) continue decline,
Secondly, during until institute's measuring pressure is more than upper limit set value, described first reversal valve (12)
First coil dead electricity, described oil pump (5) stops to described second cavity (317) fuel feeding, to rise
To stopping pressurization,
Then, during until institute's measuring pressure is less than lower limit set value, described first reversal valve (12)
First coil obtain electric make described mill (32) continue decline, described oil pump (5) continue to institute
State the second cavity (317) fuel feeding, to play ftercompction effect,
Finally, during until institute's measuring pressure is more than described lower limit set value, described mill (32) is in
Packing state.
Calcium carbonate the most according to claim 1 dry grinding hydraulic system, it is characterised in that institute
State calcium carbonate dry grinding hydraulic system and also include pressure switch (13), under described mill (32)
During fall, described pressure switch (13) is higher than described at the oil pressure of described second cavity (317)
Control described 3rd reversal valve (16) during the oil pressure that pressure switch (13) sets to commutate to carry out
Release.
Calcium carbonate the most according to claim 1 and 2 dry grinding hydraulic system, it is characterised in that
Described calcium carbonate dry grinding hydraulic system also includes that overflow valve (8), described overflow valve (8) are connected to
In hydraulic circuit, it is used for controlling the input pressure of described hydraulic cylinder (31).
Calcium carbonate the most according to claim 1 and 2 dry grinding hydraulic system, it is characterised in that
Described calcium carbonate dry grinding hydraulic system also includes plate-type non-return valve (7), described plate-type non-return valve (7)
It is connected between described oil pump (5) and described first reversal valve (12).
Calcium carbonate the most according to claim 1 and 2 dry grinding hydraulic system, it is characterised in that
Described calcium carbonate dry grinding hydraulic system also includes hydraulic control one-way valve (15), described hydraulic control one-way valve (15)
It is connected between described second reversal valve (14) and described second cavity (317).
Calcium carbonate the most according to claim 1 and 2 dry grinding hydraulic system, it is characterised in that
Described calcium carbonate dry grinding hydraulic system also includes accumulator (19), described accumulator (19) and institute
State the second cavity (317) to connect.
Calcium carbonate the most according to claim 1 and 2 dry grinding hydraulic system, it is characterised in that
Described calcium carbonate dry grinding hydraulic system also includes that cooler (9), described cooler (9) are connected to
Between described hydraulic cylinder (31) and fuel tank (20), for cooling work oil return.
Calcium carbonate the most according to claim 7 dry grinding hydraulic system, it is characterised in that institute
State calcium carbonate dry grinding hydraulic system and also include oil-suction oil filter (1) and return oil filter (2), institute
State oil-suction oil filter (1) to be connected between described oil pump (5) and described fuel tank (20), described
Return oil filter (2) is connected between described cooler (9) and described fuel tank (20).
9. the control method of a calcium carbonate dry grinding hydraulic system, it is characterised in that described carbonic acid
The control method of calcium dry grinding hydraulic system is based on the calcium carbonate according to any one of claim 1 to 8
Dry grinding hydraulic system is carried out, and comprises the following steps:
Start described calcium carbonate dry grinding hydraulic system；
Whether detect described mill (32) high spacing；
If described mill (32) high spacing, does not then control described first reversal valve (12)
Second coil and described second reversal valve (14) electric must make described mill (32) rise, by institute
Stating mill (32), to promote paramount height spacing；
If described mill (32) is in high spacing, then control described first reversal valve (12)
First coil obtains and electric described mill (32) is declined；
Starting main frame motor makes described mill (32) rotate；
Described pressure transducer (11) real-time pressure measurement when described mill (32) declines；
First, when institute's measuring pressure is less than described upper limit set value, then described first reversal valve is controlled
(12) first coil obtain electric make described mill (32) continue decline；
Secondly, during until institute's measuring pressure is more than described upper limit set value, then control described first commutation
The first coil dead electricity of valve (12), described oil pump (5) stops to described second cavity (317)
Fuel feeding, to play stopping pressurization,
Then, during until institute's measuring pressure is less than described lower limit set value, then control described first commutation
The first coil of valve (12) obtain electric make described mill (32) continue decline, described oil pump (5)
Continue to described second cavity (317) fuel feeding, to play ftercompction effect,
Finally, during until institute's measuring pressure is more than described lower limit set value, described mill (32) is in
Packing state.
The control method of calcium carbonate the most according to claim 9 dry grinding hydraulic system, it is special
Levy and be,
After described startup main frame motor makes the step that mill (32) rotates, further comprise the steps of:
Pressure switch (13) continues higher than described pressure at the oil pressure of described second cavity (317)
Control described 3rd reversal valve (16) during the oil pressure that electrical equipment (13) sets to commutate to carry out release.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410127535.5A CN103912528B (en) | 2014-03-31 | 2014-03-31 | Calcium carbonate dry grinding hydraulic system and control method thereof |
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| CN201410127535.5A CN103912528B (en) | 2014-03-31 | 2014-03-31 | Calcium carbonate dry grinding hydraulic system and control method thereof |
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| CN103912528B true CN103912528B (en) | 2016-08-31 |
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| CN106423529A (en) * | 2016-08-31 | 2017-02-22 | 江苏羚羊水泥工程技术有限公司 | Hydraulic control system for vertical grinding machine and control method |
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|---|---|---|---|---|
| JPS594451A (en) * | 1982-06-14 | 1984-01-11 | スタン・アンデユストリイ | Vertical shaft type ball mill |
| CN2805926Y (en) * | 2005-07-07 | 2006-08-16 | 北京中冶迈克液压有限责任公司 | Hydraulic pressurization system of vertical mill |
| CN101424285A (en) * | 2008-11-11 | 2009-05-06 | 上海宝田新型建材有限公司 | Hydraulic control method for COREX slag powder mill system |
| CN101543797A (en) * | 2009-04-29 | 2009-09-30 | 上海宝钢工程技术有限公司 | Vertical roller mill hydraulic system |
| US8360349B1 (en) * | 2003-06-06 | 2013-01-29 | Republic Machines, Inc. | Rotary grinder control system and method |
-
2014
- 2014-03-31 CN CN201410127535.5A patent/CN103912528B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS594451A (en) * | 1982-06-14 | 1984-01-11 | スタン・アンデユストリイ | Vertical shaft type ball mill |
| US8360349B1 (en) * | 2003-06-06 | 2013-01-29 | Republic Machines, Inc. | Rotary grinder control system and method |
| CN2805926Y (en) * | 2005-07-07 | 2006-08-16 | 北京中冶迈克液压有限责任公司 | Hydraulic pressurization system of vertical mill |
| CN101424285A (en) * | 2008-11-11 | 2009-05-06 | 上海宝田新型建材有限公司 | Hydraulic control method for COREX slag powder mill system |
| CN101543797A (en) * | 2009-04-29 | 2009-09-30 | 上海宝钢工程技术有限公司 | Vertical roller mill hydraulic system |
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| CN103912528A (en) | 2014-07-09 |
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