CN112474288A

CN112474288A - Method and device for screening samples in reverse order

Info

Publication number: CN112474288A
Application number: CN202011304470.9A
Authority: CN
Inventors: 吴财芳; 蒋秀明; 房孝杰
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-03-12

Abstract

The invention discloses a method and a device for screening samples in a reverse order, wherein a vibration screening device is used, the screening device comprises a motor and a screening frame body on a vibration spring, the screening frame body is divided into a plurality of layers, the mesh number of each layer is from thin to thick from top to bottom, each layer of screen mesh is sequentially and alternately inclined, the lower side of each layer of screen mesh is intersected with a sliding plate which is obliquely arranged in the opposite direction, a gap is reserved between the intersection and the screening frame body, sunning objects fall into the next layer from the gap, the undersize objects fall into the sliding plate, a material outlet gap is arranged at the end of each layer of sliding plate, a plurality of sample boxes are arranged outside the material outlet gap, the objects to be screened are put in from the upper layer, the objects to be screened are from thin to thick from. The design that the mesh number is from top to bottom is from large to small, so that the screening can not be like the existing positive sequence design screen sequence, and the small-particle-size sample agglomeration blocks the upper screen; the design of slope screen cloth makes the sample can not stay in the original place always, borrows the effect of gravity to make the more effective screening of sample ability, can not form the jam.

Description

Method and device for screening samples in reverse order

Technical Field

The invention belongs to the field of experimental instruments for sample preparation, and particularly relates to a method and a device for screening samples in a reverse order.

Background

When relevant research in the fields of coal, soil, rock and the like is carried out, relevant experiments of powder samples with different particle sizes are an indispensable means, and when relevant parameters of coal samples are obtained, samples with different particle sizes are required, such as: when the isothermal adsorption experiment of coal is carried out, a coal sample needs to be crushed and screened to be 0.18-0.25 mm. Therefore, how to obtain a coal sample with a specific particle size is an important experimental step in coal science research. The conventional powder sample preparation method is to place the pulverized sample on the layered stacked screens of different apertures and then to reciprocate the screens in a horizontal plane at a high frequency, and this sample screening method is liable to cause clogging of the screens with particle diameters and stacking of samples when the number of samples is excessive, resulting in low screening efficiency. Meanwhile, the traditional sample screening method is to sequentially superpose the large-aperture sample sieve, the medium-aperture sample sieve and the small-aperture sample sieve from top to bottom, and the method is easy to cause the large-aperture sample to block the screen at the upper screen, so that the small-aperture sample is difficult to smoothly fall into the lower screen, and the efficiency of sample screening is low.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a method and a device for screening samples in a reverse order. The sample is screened on the inclined screen by means of gravity, so that samples with different particle sizes from top to bottom and from thin to thick are obtained, the sample sorting efficiency is improved, and the probability of mixing small-particle-size samples into large-particle-size samples is reduced.

The technical scheme of the invention is as follows: a method for screening samples in a reverse order uses a vibration screening device, the screening device comprises a motor and a screening frame body on a vibration spring, the screening frame body is divided into a plurality of layers, the mesh number of each layer of screen mesh is from thin to thick from top to bottom, each layer of screen mesh is inclined in turn, the lower side of each layer of screen mesh is intersected with a sliding plate which is inclined in the opposite direction, a gap is reserved between the intersection and the screening frame body, a dried object falls into the next layer from the gap, the screened object falls into the sliding plate, a material outlet gap is arranged at the end of each layer of sliding plate, a plurality of sample boxes are arranged outside the material outlet gap, the object to be screened is put into the sample boxes from the upper layer, the object to be screened is from thin to thick from.

And further, the screen surface material of the last layer falls into the bottom plate overflow sample tray, is taken out and crushed again, and is subjected to secondary screening.

The invention also provides a device for screening samples in a reverse order, which comprises a motor and a screening frame body on a vibrating spring, wherein the screening device is divided into a plurality of layers, the mesh number of each layer of screen mesh is from thin to thick from top to bottom, each layer of screen mesh is sequentially and alternately inclined, the lower side of each layer of screen mesh is intersected with a sliding plate which is obliquely arranged in the reverse direction, a gap is reserved between the intersection and the screening frame body, the sunning objects fall into the next layer from the gap, the screened objects fall into the sliding plate, the end of each layer of sliding plate is provided with a material outlet slot, and a plurality of sample boxes are arranged outside the material outlet slot.

Furthermore, the injection port is a long and narrow slit.

Furthermore, the sample inlet is arranged at the lower part of the wedge-shaped sample feeding groove, and the sample feeding groove is positioned at the uppermost layer of the screening device.

Furthermore, a plurality of clamping grooves are arranged on the screening frame body, correspond to the grooves in the sample box, detachably fix the sample box on the screening frame body, and enable the sample box opening to be aligned to the discharging seam.

Further, the screening frame body is of a vertical rectangular structure.

Further, the screen mesh is inserted into the screening device.

Furthermore, an anti-skid layer is arranged on the frame of the screen.

Furthermore, the screen mesh and the horizontal plane form an included angle of 5 degrees.

Has the advantages that: 1. the design that the mesh number is from top to bottom is from large to small, so that the screening can not be like the existing positive sequence design screen sequence, and the small-particle-size sample agglomeration blocks the upper screen;

2. the design of slope screen cloth makes the sample can not stay in the original place always, borrows the effect of gravity to make the more effective screening of sample ability, can not form the jam.

Drawings

Fig. 1 is a front view of the apparatus of the present invention.

Fig. 2 is a side view of the device of the present invention.

Fig. 3 is a schematic perspective view of the device of the present invention 1.

Fig. 4 is a schematic perspective view of the device of the present invention shown in fig. 2.

Figure 5 is a screen construction of the present invention.

Fig. 6 is a structural view of a sample cartridge of the present invention.

Wherein, 1, introduction port, 2, introduction groove, 3, discharge seam, 4, draw-in groove, 5, sample box, 6, screening framework, 7, main part case base, 8, vibrating spring, 9, motor, 10, power cord, 11, screen cloth handle, 12, sample box introduction port, 13, sample box window, 14, sample box slot, 15, skid resistant course, 16, screen cloth, 17, excessive appearance dish, 18, slide.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

Example 1

A method for screening samples in a reverse order uses a vibration screening device which is divided into a plurality of layers, the mesh number of each layer of screen mesh is from thin to thick from top to bottom, each layer of screen mesh is inclined in turn, the lower side of each layer of screen mesh is intersected with a sliding plate which is inclined in the opposite direction, a gap is reserved between the intersection and a screening frame body, a dried material falls into the next layer from the gap, the dried material falls into the sliding plate, a material outlet gap is arranged at the end of each layer of sliding plate, a plurality of sample boxes are arranged outside the material outlet gap, the material to be screened is put into the sample boxes from top to bottom, and the material to be screened is from thin to thick under vibration, and the material inlet boxes are screened. And (4) the screen surface material of the last layer falls into the bottom plate overflow sample tray, is taken out and crushed again, and is subjected to secondary screening.

Example 2

The utility model provides a device of reverse order screening sample, screening framework 6 on motor 9 and vibrating spring 8, this screening plant divide into a plurality of layers, 16 mesh numbers top-down of every layer of screen cloth are from thin to thick, every layer of screen cloth 16 inclines in turn, the lower one side of every layer of screen cloth 16 is crossing with the slide 18 that sets up of opposite direction slope, the crossing department leaves the gap with screening framework 6, shine the face thing and fall into the next floor from the gap, the thing that undersize falls into slide 18, material seam 3 is established to every layer of slide 18 end, material seam 3 sets up a plurality of sample boxes 5 outward. The main box base 7 fixes the screening frame 6 of the upper half of the whole device. The power cord 10 is tapped from the bottom.

The sample inlet 1 is a long and narrow slit. In order to improve the efficiency, the invention is based on screening of relatively fine laboratory-grade samples, so that a crushing pretreatment is required for the samples, the crushing being substantially less than 1 mm. Therefore, the sample inlet is a long and narrow slit, the particle size and the number of samples entering the whole device can be controlled, and the situation that the samples enter too much at one time to form blockage and cause low screening efficiency is prevented.

The sample inlet 1 is arranged at the lower part of the wedge-shaped sample inlet groove 2, and the sample inlet groove 2 is positioned at the uppermost layer of the screening device. The sample introduction groove 2 is a wedge-shaped groove, samples after being crushed can be stacked, the samples to be screened are stacked to the sample introduction groove 2, the workload of continuous addition can be reduced, and the screening efficiency is improved.

The discharging seams 3 are positioned at two sides of the screening frame body 6, so that a screened sample with a fixed particle size can be effectively moved out of the screening frame body 6 and enters the sample box 5; the sample box inlet 12 is arranged on the side surface of the sample box 5 and is tightly embedded with the sample outlet 3. The sample box window 13 is located on the side of the sample box and made of transparent plastic, so that whether the processed sample is filled in the sample box 5 or not can be conveniently observed. The sample box slot 14 is positioned at the bottom of the sample box 5 and is a T-shaped groove which is matched with the clamping groove 4, so that the sample box is conveniently fixed on the side edge of the screening main body 6;

a plurality of clamping grooves 4 are arranged on the screening frame body 6, correspond to the grooves in the sample boxes 5, detachably fix the sample boxes 5 on the screening frame body 6, and enable the sample box openings to be aligned to the discharging seams 3. Draw-in groove 4 is located the both sides of screening framework 6, and the help blocks sample box 5 for sample box 5 can remove at will, and the sample after the convenient processing is taken.

The screening frame body 6 is of a vertical rectangular structure. The screen 16 is inserted into the screening frame 6. The screen 16 is provided with a screen handle 11 on one side and an anti-skid layer 15 on the other side.

The overflow plate 17 is arranged at the bottom of the screening frame body 6, and the sample exceeding the selected screen mesh particle size finally enters the overflow plate 17 at the bottom and is further crushed.

The screen mesh and the horizontal plane form an included angle of 5 degrees. The design of small angle has increased the time that the sample stayed the screening surface, helps improving screening area.

When the device is used, a sample with the grain diameter smaller than 1mm after being pretreated and crushed is placed in the sample feeding groove 2, the power cord 10 is connected, the motor 9 starts to vibrate, and the vibrating spring 8, the main box base 7 and the screening frame 6 are driven to carry out high-frequency circulating reciprocating vibration; the sample passes through the introduction port 1 under the effect of device vibration, gets into inside the screening framework 6, falls into screen cloth 16, and the sample that is less than the screen cloth aperture sees through the screen cloth, falls into sample spout 18, finally gets into appearance mouth 3 in proper order and gets into sample box 5, accomplishes the screening.

Example 3

The inside of the whole screening device is provided with 10 screen slots, and the screen slots are 200 meshes, 100 meshes, 80 meshes, 60 meshes, 40 meshes and 20 meshes from top to bottom according to the screening requirements of samples in a conventional laboratory. The sample sieves the sample of different particle sizes in proper order, accomplishes the screening, and small-size mesh number sets up multilayer sifting surface and can improve screening efficiency and precision.

The screening surface is arranged in the inside of screening framework 6 by the slope, and in order to raise the efficiency, the contained angle of screening surface and horizontal plane is 5, and the design of small angle has increased the time that the sample stayed the screening surface, helps improving the screening area. The design of the screen surface inclined to and fro effectively reduces the volume of the device, and is convenient to carry and place. The design of activity sifter helps designing the sifter of different mesh numbers, can place the slot of different mesh numbers in whole device through the slot: 300 meshes, 500 meshes and the like, so that the device has more expanded utilization space. The screening plant main part on upper portion passes through the screw and is connected with main part case base 7, and dispersion detachable design makes the device be convenient for transport and removes.

Claims

1. A method for screening samples in a reverse order is characterized in that a vibration screening device is used, the screening device comprises a motor and a screening frame body on a vibration spring, the screening frame body is divided into a plurality of layers, the mesh number of each layer of screen mesh is from thin to thick from top to bottom, each layer of screen mesh is inclined in turn, the lower side of each layer of screen mesh is intersected with a sliding plate which is inclined in the opposite direction, a gap is reserved between the intersection and the screening frame body, a dried object falls into the next layer from the gap, the dried object falls into the sliding plate, a material outlet gap is arranged at the end of each layer of sliding plate, a plurality of sample boxes are arranged outside the material outlet gap, the object to be screened is put in from the upper layer, the object to be screened is from thin to thick from top to.

2. The method of claim 1, wherein the final layer of the sifting material falls into a bottom plate overflow plate, is taken out and crushed again for secondary sifting.

3. The utility model provides a device of reverse order screening sample, screening framework on including motor and vibrating spring, its characterized in that, this screening plant divide into a plurality of layers, and the screen cloth mesh number top-down of every layer is by thin to thick, and every layer of screen cloth inclines in turn in proper order, and the lower one side of every layer of screen cloth is crossing with the slide that the opposite direction slope set up, and the crossing department leaves the gap with the screening framework, shines the face thing and falls into the next floor from the gap, and the thing that undersize falls into the slide, and the material gap is established at every layer of slide end, and the material gap sets up a plurality of sample boxes outward.

4. The apparatus according to claim 3, wherein the sample inlet is an elongated slit.

5. The apparatus of claim 4, wherein the sample inlet is installed at the lower part of the wedge-shaped sample inlet groove, and the sample inlet groove is located at the uppermost layer of the screening device.

6. The apparatus according to claim 3, wherein the screening frame has a plurality of slots corresponding to the slots of the sample cassette, the sample cassette is detachably fixed to the screening frame, and the opening of the sample cassette faces the discharge slot.

7. The apparatus for reverse screening samples according to claim 3 or 6, wherein the screening frame is a vertically rectangular structure.

8. The apparatus for reverse screening a sample according to claim 3 wherein said screen is inserted into said screening device.

9. The apparatus according to claim 3, wherein the frame of the screen is provided with an anti-slip layer.

10. The apparatus according to claim 3, wherein the screen is disposed at an angle of 5 ° to the horizontal.