CN1364664A

CN1364664A - Sizing screen

Info

Publication number: CN1364664A
Application number: CN 01105209
Authority: CN
Inventors: 俞信国
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-11
Filing date: 2001-01-11
Publication date: 2002-08-21

Abstract

The grading screen may be used in grains, feed food, chemical and other fields. The present invention has the technological measures of rotating screen and high pressure air pulse to ensure the fast penetration of qualified component through the sieve, the fast leaving of the greater component from the sieve surface and clean sieve surface; and negative pressure sucking to make fine grains penetrate through the sieve fast. The present invention can reach the effect of smaller sieve are and high grading effect.

Description

Classifying screen

The present invention relates to a kind of classifying screen, use in fields such as grain, feed, food, chemical industry usually.

The classifying screen shape side of having sieve commonly used, rotary strainer, the drum sieve, working method has slide sieve, vibratory sieve, rotary screen etc.There are some defectives in these sieves: be suitable for coarse grained classification, poor for the microparticle grading effect, 60,80,100 purpose materials often need very large tracts of land, and often stifled sieve, need the labor cleaning sometimes, and are impracticable.Another kind of no sieve classifier is utilized different-grain diameter material suspended velocity difference, regulates rotating propeller blade, changes the resistance of wind, obtains different wind speed, separates the different-grain diameter material.This clasfficiator does not have stifled sieve fault, be widely used, but there is deficiency in the basic principle of this clasfficiator, material suspended velocity is not only relevant with material particular diameter, and also with material proportion, surface configuration is relevant, therefore, in the use of grain, feed, food service industry, the finished product granularity is irregular.

The reason that sieve classification sieve microparticle grading effect difference is arranged: 1, when material contacted with sieve, qualified powder passed sieve aperture, the underproof sieve surface of still staying, the overall process until sieve hinders all the other qualified powders to pass sieve aperture.Simultaneously, in the screening process, defective powder ratio rises in the material, and classification efficiency further descends.2, microparticle, light weight is passed sieve aperture by deadweight, and speed is slow, if it is long-pending to strengthen compass screen surface, cost is big, and is impracticable; If want compass screen surface long-pending little, then the bed of material is thick, and grading effect is poorer.Should compass screen surface long-pending little, effective again, this contradiction can't solve in existing classifying screen.

The purpose of classifying screen of the present invention makes that compass screen surface is long-pending little, the microparticle grading effect is good.

The method that classifying screen of the present invention adopts: 1, adopt and revolve sieve and high pressure air pulse measure, make that qualified powder passed sieve aperture when material contacted with sieve, underproof big grain leaves the sieve surface at once, keeps the compass screen surface cleaning.2, adopt the negative pressure air draught, make fine silt not pass sieve aperture by deadweight, additional air draught power makes it pass sieve aperture rapidly.

In conjunction with the accompanying drawings 1, new has the sieve classification sieve structure as follows:

Revolve sieve (2) and become drum shape, go out mouth down, the center has one to revolve sieve main shaft (2-4), links to each other with (3) motor by (4) shaft coupling, can do rotation at a high speed.Revolve in the sieve, deviate from casing top air inlet (1-1) and locate, one (7) high-pressure air tube is arranged, by (7-1) solenoid control, can produce intermittently adjustable high pressure draught, self-timing cleans (2-1) sieve sheet.Revolve the sieve outsourcing and a casing (1) with two outlets of an import, there is a casing raw material air inlet (1-1) casing top, and air inlet is rectangle, and length is (2) length of revolving sieve quite, with the distance of revolving sieve at the 1-20 millimeter.There is casing coarse fodder discharging opening (1-2) below, the casing below also has a casing finished product discharging opening (1-5), revolve to export under the sieve to adorn between (2-2) and the body below casing finished product discharging opening (1-5) and each have rubber packing bar (2-3), (1-4), the diameter of two rubber packing bars is identical, regulate two rubber packing bars horizontal range at the 0-3 micron, both can be rotated relatively, again coarse grain is played sealing effectiveness.

During work, raw material sucks from (1-1) casing raw material air inlet, and qualified material passes (2-1) and revolves sieve sieve sheet under the negative pressure air effect, from the sucking-off of (1-5) casing finished product discharging opening, and by follow-up blower fan, cyclone, dust arrester reclaims finished product.Underproof coarse dust is revolved sieve sieve sheet by (2-1) to be stopped, turns over suitable angle, is revolved sieve centrifugal force and dishes out, and sinks along casing, to (1-2) casing discharge port, is discharged by airlock.Pressure-air jet pipe (7) intermittently sprays pressure-air, oppositely sprays to and revolves sieve, strengthens revolving the dish out effect of coarse dust of sieve centrifugal force.

On the technical measures, raw material air inlet wind speed 10-30M/S revolves the sieve linear velocity and is greater than raw material air inlet wind speed, makes compass screen surface material bed thinner, the compass screen surface good separating effect.Revolve sieve finished product discharging opening direction down, preventing materials accumulation.Casing and revolve screening sealed ubber strip is not respectively arranged is convenient to make and debugging.The pressure-air jet pipe is directed upwardly, and pressure-air is blowed to away from the sieve of import first, is convenient to the coarse dust that blows off.

Accompanying drawing:

Fig. 1 is the total figure that revolves sieve.(1) casing, (1-1) casing raw material air inlet, (1-2) casing discharge port, (1-3) casing changes sieve door, (1-4) casing sealing rubber bar, (1-5) casing finished product discharging opening.(2) revolve sieve, (2-1) revolve sieve sieve sheet, (2-2) revolve sieve finished product discharging opening, (2-3) revolve the sieve sealed ubber strip, (2-4) revolve the sieve main shaft.(3) motor.(4) shaft coupling.(7) pressure-air jet pipe, (7-1) pressure-air magnetic valve.

Fig. 2 is a kind of commercial Application process chart that revolves sieve.(5) blower fan.(6) airlock.(8) pulverizer, (9) cyclone, (10) dust arrester, (11) airlock,

Embodiment:

With reference to Fig. 1, this machine is by (1) casing, (1-1) casing raw material air inlet, (1-2) casing discharge port, (1-3) casing changes sieve assembling door, (1-4) casing sealing rubber bar, (1-5) casing finished product discharging opening, (2) revolve sieve, (2-1) revolve sieve sieve sheet, aperture 40,60,80,100, order are selected arbitrarily.(2-2) revolve sieve finished product discharging opening, (2-3) revolve the sieve sealed ubber strip, (2-4) revolve the sieve main shaft, (3) motor, (4) shaft coupling, (5) blower fan, (6) airlock, (7) pressure-air jet pipe, (7-1) composition such as pressure-air magnetic valve.

Embodiment (5) blower fan on technology adopts high pressure positive blower, and raw material air inlet wind speed 10-30M/S revolves sieve linear velocity 40-60M/S, is greater than raw material air inlet wind speed, makes compass screen surface material bed thinner, and the compass screen surface coarse grain is easily dished out.Revolve sieve finished product discharging opening direction down, preventing materials accumulation.Casing and revolve screening sealed ubber strip is not respectively arranged is convenient to make and debugging.The pressure-air jet pipe is directed upwardly, and pressure-air is blowed to away from the sieve of import first, is convenient to the powder that blows off.

With reference to Fig. 2, this machine is linked (8) pulverizer, (9) cyclone, (10) dust arrester, (11) airlock, this classification sieve classification function plays a role.The powder that pulverizer is discharged, through revolving sieve classification, underproof coarse fodder returns pulverizer, pulverizes again, and is qualified in cyclone, dust arrester, airlock is collected, and regulates the pressure-air jet time, and sieve is from better effects if.

The present invention has remarkable result: 1, and when material contacted with sieve, qualified powder passed sieve aperture, underproof coarse grain, After turning over the air inlet angle, revolved sieve centrifugal force and dished out, leave at once the sieve surface, the compass screen surface of clearing up rotates through again Contact with raw material, so that the work compass screen surface cleans all the time. The pressure-air jet pipe intermittently sprays pressure-air, strengthens revolving Screening is from the effect of powder. 2, thin material moves with the wind, passes sieve aperture, and than sieving by its deadweight, speed increases tens of Doubly, be equivalent to the long-pending decades of times that increases of compass screen surface. New clasfficiator can under littler sieve nest condition, be isolated thin efficiently Powder, the powder uniformity also is better than not having sieve classifier, has reached the purpose that compass screen surface is long-pending little, the fine silt grading effect is good.

Claims

1, a kind of classifying screen comprises the sieve sheet, casing, motor etc., be characterized in that described sieve sheet is into the sieve that revolves that drum shape can be done rotation at a high speed, revolve in the sieve, contain a high-pressure air tube, by solenoid control, can produce intermittently adjustable high pressure draught, revolve the sieve outsourcing and a casing, revolve to sieve between outlet down and the casing finished product discharging opening rubber packing bar is housed separately with two outlets of an import.

2, the sieve that revolves according to claim 1 goes out mouth down, and there is a rotating shaft at the axle center, links to each other with motor by the shaft coupling system, can rotate.

3, a high-pressure air tube according to claim 1 is by solenoid control, can produce intermittently adjustable high pressure draught, high-pressure gas pressure is greater than 4kg/cm2, and the tracheae spout is facing to the one side away from the casing charging aperture, when pressure-air is opened, can self-timing cleaning screen sheet.

4, casing according to claim 1, there is a raw material air inlet casing top, air inlet is rectangle, length is quite revolved the length of sieve, with the distance of revolving sieve at the 2-20 millimeter, discharge port and casing finished product discharging opening of a coarse fodder arranged under the casing.

5, according to claim 1ly revolve the rubber packing bar that sieve is equipped with between outlet and the casing finished product discharging opening down separately, the diameter of two rubber packing bars is identical, regulate two rubber packing bars horizontal range at the 0-3 micron, both can be rotated relatively, again coarse grain is played sealing effectiveness.