CN102836757A

CN102836757A - Screening piece for hammer grinder

Info

Publication number: CN102836757A
Application number: CN2012103461246A
Authority: CN
Inventors: 赵波; 唐军
Original assignee: Jiangsu Muyang Group Co Ltd
Current assignee: Jiangsu Muyang Group Co Ltd
Priority date: 2012-09-18
Filing date: 2012-09-18
Publication date: 2012-12-26

Abstract

The invention relates to a screening piece for a hammer grinder in the field of a material grinder, which is used for grinding grains and feeds. The screening piece for the hammer grinder comprises at least one sieve plate; a plurality of sieve pores are formed in the sieve plate; the sieve plate is bent or spliced into a shape capable of enveloping a rotor; the sieve pores are distributed in an inverted V shape in the peripheral direction of the outer wall of the sieve plate; and the inverted V shape has an angle of 10 degrees to 45 degrees. In the invention, a great amount of experiment researches find that after materials are ground, the motion track of the materials shows the characteristic of symmetrical inverted V-shaped dispersion motion in the motion direction of a hammer; the sieve pores in the screening piece are set into an inverted V shape consistent with the motion track of the ground materials, so that the ground materials are discharged in time from the sieve pores and the materials are prevented from not being discharged in time due to the formation of a circulation layer of the materials; the efficiency of the grinder is effectively improved; and a new research direction is provided for improving the efficiency of the grinder.

Description

Hammer crusher sieve sheet

Technical field

The present invention relates to a kind of materials crusher, particularly a kind of sieve sheet device that is used to pulverize the hammer crusher of grain, feed.

Background technology

Hammer crusher structure of the prior art comprises that envelope is at the peripheral sieve plate of rotor mill; Be evenly equipped with some rectangular distributions or equilateral triangle degree distribution sieve aperture on the sieve plate; Constitute pulverizing chamber jointly with body, hammer leaf hits comminuting matter pulverizing the indoor high-speed rotation.Small particles material by after pulverizing rotates with hammer leaf, under action of centrifugal force, rushes at sieve plate, under the effect of gravity and auxiliary air draft system, discharges from sieve aperture.If can not in time discharge after material is pulverized from sieve aperture; With the circulation layer that forms along sieve plate inwall circular motion, and under action of centrifugal force, big slightly granule materials is close to the sieve plate inwall; Block sieve aperture; Little particle moves in a circle in the bulky grain inboard, and can't discharge from sieve aperture, and this circulation layer effect obviously reduces the efficient of pulverizer.Therefore; Whether pulverized material can discharge from discharge opening smoothly timely is one of key factor that influences pulverizer efficient; For improving pulverizer efficient, the following means of main at present employing: 1) improve the percent opening of sieve plate, so that the material of pulverizing discharge in time smoothly; 2) shape of change pulverizing chamber as pulverizing chamber being made into water droplet shape, to destroy the circulation layer of material in pulverizing chamber, is in time discharged thereby be convenient to material; 3) shape of change sieve plate inner surface is to destroy the material circulation layer.But the effect of above-mentioned raising material efficient is also not obvious, and the negative effect that can bring other simultaneously improves sieve-plate aperture ratio, can reduce the strength and stiffness of sieve plate, and reduced the service life of sieve plate; The shape that changes the shape of pulverizing chamber or change the sieve plate inner surface is with the circulation layer of destruction material in pulverizing chamber, with accelerating the wearing and tearing of material to pulverizing chamber or sieve plate, the service life of reducing associated components.

Summary of the invention

The present invention is directed to and improve the problem that pulverizer efficient process exists in the prior art; Hit the characteristics of pulverizing the back movement locus by hammer leaf according to material; A kind of hammer crusher sieve sheet of sieve aperture different distributions mode is provided; The distribution track of sieve aperture and the track of material movement are reached unanimity, after making things convenient for material to pulverize, in time discharge, improve material grinding efficient from sieve aperture.

The purpose of invention is to realize like this; A kind of hammer crusher sieve sheet; Comprise at least one sieve plate, offer some sieve apertures on the sieve plate, but sieve plate is crooked or be spliced into the shape of envelope rotor; Said sieve aperture circumferentially is " people " font along the sieve plate outer wall and distributes, and said " people " font angle is 10 °-45 °.

In the prior art in the technological means of various raising pulverizer efficient, all from improving sieve-plate aperture ratio, increasing the probability that material is discharged from sieve aperture, or the circulation layer that destroys material changes the material movement track and in time discharges to make things convenient for material.But do not have from the angle consideration of the relation of crushing rear material movement locus and sieve aperture position, so that the improvement means effect of prior art is limited.Among the present invention; Find that through a large amount of experimental study big granule materials is ground into the small particles material of some dispersions in pulverizing chamber after the hammer leaf of high speed circular motion hits, the small particles material that is hit fragmentation is dispersed to both sides along the hammer leaf beating position and is moved; Its movement locus is " people " shape of symmetry along the direction of motion of hammer leaf; And the distribution mode of the sieve aperture of prior art rectangular or equilateral triangle on sieve plate, the track of most of material movement and the position distribution of sieve aperture are also inconsistent, and material can not in time be discharged from sieve aperture; Cause material to form circulation, and be difficult to timely discharge at sieve sheet inwall.Further discover, material by hit the back the herringbone angle be 10 °-45 ° the zone in the distribution more concentrated.Sieve sheet of the present invention; According to material by the characteristics of the movement locus after pulverizing; Sieve aperture circumferentially is " people " font along the sieve plate outer wall distributes, and " people " font angle is 10 °-45 ° the position distribution of sieve aperture and the movement locus of crushing rear material are reached unanimity, be convenient to material and in time discharge from sieve aperture; Under the identical situation of percent opening, the efficient of pulverizer is effectively improved, for the exploitation aspect that improves pulverizer efficient provides a new research direction.

In time discharge from sieve aperture for further being convenient to material, said sieve aperture is interspersed at adjacent " people " font obliquely.

Another improves as the present invention, said sieve aperture be shaped as circle, ellipse or long waist shaped.

Description of drawings

Rectangular sieve sheet and the material movement that is interspersed of sieve aperture concerns sketch map in Fig. 1 prior art.

Fig. 2 concerns sketch map for sieve sheet and the material movement that sieve aperture in the prior art is the equilateral triangle distribution.

Fig. 3 is the sieve sheet that " herringbone " distributes for sieve aperture of the present invention.

Fig. 4 is for adopting the pulverizing chamber structural front view of sieve sheet of the present invention.

Fig. 5 is the left view of this Fig. 4.

Fig. 6 be material by the hammer leaf crushing rear material along herringbone track sketch map.

Wherein, 1 sieve sheet; The 1a sieve plate; The 1b sieve aperture; 2 hammer frame plates; 3 rotors; 4 bearing pins; 5 hammer leaves; 6 large granular materials; 7 small particles materials.

The specific embodiment

Like Fig. 3 is hammer crusher sieve sheet of the present invention; This sieve sheet 1 comprises at least one sieve plate 1a; Offer some sieve aperture 1b on the sieve plate 1a; But sieve plate 1a is crooked or be spliced into the shape of envelope rotor 4, and sieve aperture 1b circumferentially is " people " font along sieve plate 1a outer wall and distributes, and " people " font angle beta value is 10 °-45 °; And for improving the discharge velocity of sieve aperture, sieve aperture 1b is interspersed at adjacent " people " font obliquely, and the shape of sieve aperture 1b can be selected circle, ellipse or long waist shaped for use.Like Fig. 4, Fig. 5 and the pulverizing chamber for the hammer crusher that adopts sieve sheet of the present invention shown in Figure 6; Sieve sheet 1 forms envelope in rotor 3 peripheries by some sieve plate 1a splicing bendings; Rotor 3 is provided with hammer frame plate 2, and hammer leaf 5 is fixing evenly distributed along rotor 3 peripheries through the bearing pin 4 that passes hammer frame plate 2, and sieve sheet 1 envelope is in hammer leaf 5 peripheries; And and 5 maintenances of hammer leaf certain clearance, so that material movement is discharged.

Sieve sheet of the present invention; Small particles material 7 backs of being hit the dispersion of back formation according to large granular materials 6 by hammer leaf are the characteristics of herringbone orbiting motion to both sides; Sieve aperture 1b is arranged to circumferentially to be " people " font along sieve plate 1a outer wall to distribute; And " people " font angle beta value is 10 °-45 °; The position distribution of sieve aperture 1b is reached unanimity with the movement locus of pulverizing back small particles material 7, be convenient to small particles material 7 and in time discharge, under the identical situation of percent opening, the efficient of pulverizer is obviously improved from sieve aperture 1b.

The contrast experiment who is the pulverizer efficient of the sieve chip architecture that equilateral triangle distributes below with the hammer crusher that adopts sieve chip architecture of the present invention and sieve aperture of the prior art.For ease of the contrast of experimental result, two kinds of pulverizers only sieve the position distribution difference of sieve aperture on the sheet, and the percent opening of sieve plate is identical, the shape of pulverizing chamber and measure-alike.The shape of the sieve aperture that adopts in the experiment is the circular hole that the aperture is φ 2.And be used in the raw meal particle size of two kinds of same kinds in the equipment in the experiment, parameters such as humidity are identical.Comparing result is as described in Table 1.

Experimental result from above-mentioned table is found out, adopts the present invention to sieve the hammer crusher of chip architecture, and efficient all is higher than the pulverizer of sieve chip architecture in the prior art.

The present invention is not limited to the foregoing description, and for example, sieve aperture can also be selected forms such as ellipse or long waist shaped hole for use, in addition, also can the sieve plate and the water droplet shape pulverizing chamber respective outer side edges of structure of the present invention be used, with further raising pulverizer efficient.Every on the basis of technical scheme disclosed by the invention; Those skilled in the art is according to disclosed technology contents; Do not need performing creative labour just can make some replacements and distortion to some technical characterictics wherein, these replacements and distortion are all in the scope of the present invention's protection.

Claims

1. a hammer crusher sieve sheet comprises at least one sieve plate, offers some sieve apertures on the sieve plate; But sieve plate is crooked or be spliced into the shape of envelope rotor; It is characterized in that said sieve aperture circumferentially is " people " font along the sieve plate outer wall and distributes, said " people " font angle is 10 °-45 °.

2. according to the described hammer crusher sieve of claim 1 sheet, it is characterized in that said sieve aperture is interspersed at adjacent " people " font obliquely.

3. hammer crusher according to claim 1 and 2 sieve sheet is characterized in that, said sieve aperture be shaped as circle, ellipse or long waist shaped.