CN202072972U - Controlling device of pressure screen - Google Patents
Controlling device of pressure screen Download PDFInfo
- Publication number
- CN202072972U CN202072972U CN2010206453708U CN201020645370U CN202072972U CN 202072972 U CN202072972 U CN 202072972U CN 2010206453708 U CN2010206453708 U CN 2010206453708U CN 201020645370 U CN201020645370 U CN 201020645370U CN 202072972 U CN202072972 U CN 202072972U
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- pressurized screen
- valve
- slurry
- pressure screen
- controlling unit
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Abstract
The utility model provides a controlling device of a pressure screen, the controlling device includes a pressure screen and a controller connected to the pressure screen, the pressure screen includes an slurry inlet-outlet flow control unit and a tail slurry flow control unit, the slurry inlet flow control unit of the pressure screen is composed of a first flowmeter arranged at the slurry inlet and a first valve arranged at the accept slurry outlet, the tail slurry flow control unit of the pressure screen is composed of a second flowmeter and a second valve that are arranged at the tail slurry outlet, in addition, the pressure screen is provided with a white water inlet, the white water inlet is provided with a third valve, and the first and second flowmeters, and the first, second and third valves are respectively connected to the controller. The controlling device of the pressure screen can timely and effectively find out and eliminate the blocking of the pressure screen.
Description
Technical field
The utility model relates to a kind of pressurized screen, particularly a kind of pressurized screen control device.
Background technology
The pressure type pulp screen is called for short pressurized screen, is comparatively advanced at present sealing apparatus for screening fibrous suspensions, and its principal character is that line seal, pressure advance slurry.Pressurized screen is one of requisite visual plant in the Waste Paper Handling process, and it controls more complicated, and the control difficulty is big, requires high.
Because intrinsic concentration phenomena in all many and pressurized screen of dopant species and quantity in the secondary stock sometimes, pressurized screen can stop up.During operate as normal, go out good slurry and go out tail slurry, all control, carry out ratio control according to a certain percentage by single loop PID controller separately.For obstruction, original adoption is artificially judged, handles during discovery again, often stops up quite serious.Obstruction can bring great harm, and the blocked meeting of sieve plate opening makes motor overload, and long-time overload operation can make electrical machinery life shorten.And the sign of obstruction is also apparent in view, and the pressure reduction of pressurized screen stock inlet and good slurry outlet can surpass higher limit, and slurry-outlet quantity obviously reduces.
The utility model content
Technical problem to be solved in the utility model provides a kind of pressurized screen control device, and it can find and get rid of the pressurized screen clogging effectively.
For achieving the above object, the utility model provides a kind of pressurized screen control device, comprise pressurized screen and the controller that is connected with pressurized screen, described pressurized screen comprises turnover slurry flow controlling unit and tail slurry flow controlling unit, described pressurized screen advances to starch flow controlling unit and is made up of first flow meter that is arranged on stock inlet and first valve that is arranged on good slurry outlet, described pressurized screen tail slurry flow controlling unit is made up of second flowmeter and second valve that are arranged on the tail slurry outlet, in addition, pressurized screen is breathed out and is provided with the plain boiled water import, this plain boiled water import is provided with the 3rd valve, described first and second flowmeters, first, second and third valve links to each other with controller respectively.
The utility model pressurized screen control device has the following advantages at least: the pressure reduction in detected pressurized screen is greater than the upper limit, but go up in limited time less than stopping up simultaneously, controller carries out fuzzy reasoning according to differential pressure, reduce the opening value of first valve, simultaneously, open the opening value of big second valve, and open the 3rd valve that is provided with in the plain boiled water import, to the pressurized screen water filling, reduce the concentration of slurry, get rid of the generation of clogging with this.
Description of drawings
Fig. 1 is the structural representation of the utility model pressurized screen control device.
The specific embodiment
With reference to Fig. 1, by the ash-retention efficiency formula: ash-retention efficiency=slurry-outlet quantity/grout absorption as can be known, as long as, just can guarantee stablizing of ash-retention efficiency to advancing to starch flow and the tail slurry flow control effectively.Therefore, the utility model control device is provided with controller and turnover slurry flow controlling unit and tail slurry flow controlling unit respectively.Described controller is built-in with fuzzy control model; Described pressurized screen advances to starch flow controlling unit to be made up of first flow meter that is arranged on stock inlet 1 and first valve that is arranged on good slurry outlet 4, and described pressurized screen tail slurry flow controlling unit is made up of second flowmeter and second valve that are arranged on tail slurry outlet 3.
Slurry inlet flow rate, tail slurry rate of discharge proportioning for pressurized screen are that benchmark carries out with the setting value, help strengthening the relative stability of system like this.In like manner, plain boiled water also constitutes ratio control with slurry-outlet quantity or grout absorption.
Pressure reduction in detected pressurized screen is greater than the upper limit, but go up in limited time less than stopping up simultaneously, controller will be made following action: on the basis of the original opening value of first valve, carry out fuzzy reasoning according to differential pressure, turn down this valve with corresponding decrement, wherein, differential pressure is big more, the amount of closing of valve is big more, to reduce very to starch output; Simultaneously, open big second valve according to the fuzzy reasoning result, wherein differential pressure is big more, and the opening of valve is big more, to improve ash-retention efficiency, increases the tail slurry flow; Meanwhile, open the 3rd valve that is provided with in the plain boiled water import 2,, reduce the concentration of slurry to the pressurized screen water filling.
Under the dense and bigger ash-retention efficiency condition of lower slurry, the blockage of mesh can improve, and very fast elimination obstruction, and the pressure differential of import and export decreases, and closes the 3rd valve then, makes system get back to ratio control automatically.For first and second valves, carry out fuzzy reasoning according to differential pressure and differential pressure rate of change, thereby obtain reasonably valve position changing value.
Sometimes the generation of intrinsic concentration phenomena in all many and pressurized screen of dopant species and quantity in the secondary stock, pressurized screen can stop up, prescribe a time limit above going up on the differential pressure when the pressure reduction of stock inlet and grout outlet, the expression pressurized screen stops up, and at this moment takes following emergency treatment method:
1. the valve position before record stops up constantly;
2. close first valve of good slurry outlet, second valve of standard-sized sheet tail slurry outlet, the 3rd valve of standard-sized sheet plain boiled water import;
3. hold mode a period of time (time length is decided by stopping state);
4. pressure reduction normal after, the valve position before recovering to stop up;
5. recover normal control behind the about 2S of hold mode.
The above only is a kind of embodiment of the present utility model, it or not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model specification is claim of the present utility model and contains.
Claims (2)
1. pressurized screen control device, it is characterized in that: comprise pressurized screen and the controller that is connected with pressurized screen, described pressurized screen comprises turnover slurry flow controlling unit and tail slurry flow controlling unit, described pressurized screen advances to starch flow controlling unit and is made up of first flow meter that is arranged on stock inlet (1) and first valve that is arranged on good slurry outlet (4), described pressurized screen tail slurry flow controlling unit is made up of second flowmeter and second valve that are arranged on tail slurry outlet (3), in addition, pressurized screen also is provided with plain boiled water import (2), this plain boiled water import is provided with the 3rd valve, described first and second flowmeters, first, second and third valve links to each other with controller respectively.
2. pressurized screen control device as claimed in claim 1 is characterized in that: described controller is built-in with fuzzy control model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206453708U CN202072972U (en) | 2010-12-08 | 2010-12-08 | Controlling device of pressure screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206453708U CN202072972U (en) | 2010-12-08 | 2010-12-08 | Controlling device of pressure screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202072972U true CN202072972U (en) | 2011-12-14 |
Family
ID=45111076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206453708U Expired - Fee Related CN202072972U (en) | 2010-12-08 | 2010-12-08 | Controlling device of pressure screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202072972U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2708110C1 (en) * | 2019-04-09 | 2019-12-04 | Николай Васильевич Байкин | Fibrous materials sorting device |
-
2010
- 2010-12-08 CN CN2010206453708U patent/CN202072972U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2708110C1 (en) * | 2019-04-09 | 2019-12-04 | Николай Васильевич Байкин | Fibrous materials sorting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20121208 |