WO2019091333A1

WO2019091333A1 - Mesh belt screen with function of spiral sieving, usage method therefor and use thereof

Info

Publication number: WO2019091333A1
Application number: PCT/CN2018/113571
Authority: WO
Inventors: 刘全义
Original assignee: 刘全义
Priority date: 2017-11-08
Filing date: 2018-11-02
Publication date: 2019-05-16
Also published as: CN108372104A; CN108311390A; CN208824949U; CN208583594U; CN208373576U; WO2019091330A1; WO2019091331A1; WO2019091334A1; CN109290191A; CN107716262A; CN109225797A; WO2019091335A1; WO2019091332A1; CN109290190A; CN108212770A; CN108311389A; CN208427375U

Abstract

Disclosed is a mesh belt screen used in industry and mining, comprising a screen frame (1), wherein the screen frame is connected to a screen box via hanging rods (2), rocker rods or swing rods; the screen box is internally provided with a set of mesh belt screens (3); a plane gyratory mechanism (4) is mounted between the mesh belt screens (3); mesh belt screen surfaces comprise large-particle mesh belt screen surfaces (31), medium-particle mesh belt screen surfaces (32), or small-particle mesh belt screen surfaces (33), or a combination of two or three types of the above-mentioned mesh belt screen surfaces; the mesh belt screen surfaces are connected to a driving mechanism (41); and an oblique material discharge sliding plate (5) is provided between upper and lower screen surfaces of the small-particle mesh belt screen, which is located outside a bottom layer. The mesh belt screen solves the problems of traditional screens whereby the kinetic energy imparted to a sieved object sieving is small, or due to the linear motion, rolling performance during processing is poor, the screen is easily blocked, and the sieving capability and the sieving effect are difficult to improve.

Description

Spiral screened mesh belt screen and method and use thereof

Technical field

The present invention provides a physical screening machine, in particular a machine for imparting a spiral motion for sieving, a machine for sieving in an industrial granular material or mining industry, and a physical grading method for the granular material using the machine.

Background technique:

Screening machines commonly used in industrial and mining enterprises include inertial vibrating screens and resonant screens. The vibrating screen for mining works by the reciprocating rotary vibration generated by the vibration of the vibrator. The upper rotating weight of the vibrator causes a plane to oscillate the surface of the screen, while the lower rotating weight causes the screen surface to produce a cone-shaped rotating vibration. The combined effect of the vibrating effect causes a complex-rotating vibration of the screen surface. Its vibration trajectory is a complex space curve. The curve is projected as a circle on the horizontal plane and an ellipse on the vertical plane. Adjust the excitation force of the upper and lower rotary weights to change the amplitude. Adjusting the spatial phase angle of the upper and lower weights can change the curve shape of the screen movement trajectory and change the movement trajectory of the material on the screen surface. Most are a filter mechanical separation device for mud solid phase treatment, consisting of a screen and a vibrator. The thickness of the screen is shown by eyes. Generally, the mesh of 50 mesh or less is a coarse mesh, and the mesh of 80 mesh or more is a fine mesh. The vibrator is an eccentric wheel that rotates under the motor to vibrate the screen frame. Due to the vibration of the screen frame, the coarser solid particles remain on the screen surface when the mud flows to the screen surface, and are discharged from one end along the slope. The finer solid phase particles and the mud liquid flow through the sieve hole to the mud pool. .

The physical sieving process is a process of dividing a group of broken materials having different particle sizes into a plurality of layers of different layers through a single layer or a plurality of layers of uniform pores, which is called sieving. The particles larger than the sieve holes are left on the sieve surface, which is called the sieve residue of the sieve surface, and the particles smaller than the sieve pores pass through the sieve holes, which are called the sieve bottoms of the sieve surface. The actual screening process is: after a large number of different sizes and sizes of coarse and scattered materials enter the screen surface, only a part of the particles are in contact with the screen surface. Due to the vibration of the screen box, the material layer on the screen is loosened, so that the large particles exist. The gap is further enlarged, and the small particles take the opportunity to pass through the gap and transfer to the lower layer or the conveyor. Since the small particle gap is small, the large particles cannot pass through, so that the original disordered particle group is separated, that is, the layer is stratified according to the particle size, and the arrangement rule of the small particles under the coarse particles is formed. The fine particles reaching the sieve surface are sieved through the sieve, and finally the coarse and fine particles are separated to complete the screening process.

However, sufficient separation is not available, and during sieving, a portion of the undersize is typically left in the sieve residue. When the fine particles are sieved, although the particles are smaller than the mesh holes, the ease of screening is different. The particles with similar materials and mesh sizes are difficult to pass through the sieve, and the particle gap passing through the lower layer of the sieve is more difficult.

The resonant screen is a vibrating screen with a vibrating frequency of the screen surface that matches the natural vibration frequency of the screen surface (including the loaded material). In theory, only giving enough energy to overcome the internal resistance of the elastomer (spring or rubber) can sustain the vibration, so that this screening has a series of advantages of the general vibrating screen, and also has a prominent power consumption. advantage. Widely used to screen materials of various sizes. The difference from the vibrating screen is that the vibrating screen works in a super-resonant state away from the resonance region; and the resonating screen works in a condition close to the resonance region, that is, the working frequency of the screening machine is close to its own natural vibration frequency. With this feature, it is possible to drive a large-area screen box with a small vibration force, so the power consumption of the resonance screen is small and the production capacity is large.

The traditional sieve gives the kinetic energy of the sieved object small or linear motion, and the rolling performance during processing is poor, and it is easy to block, and the screening ability and the screening effect are difficult to be improved.

Purpose of the invention:

The object of the present invention is to provide a spiral screen mesh screen and a use method of the mesh screen and the use in the industrial and mining industries. The invention makes the sieved object spirally move, significantly improves the quality of the sieve, and sieves. The ability has improved significantly.

The object of the invention is achieved in this way:

A mesh belt screen for industrial and mining, comprising: a screen frame, wherein the screen frame is connected to the screen box by a boom or a rocker or a pendulum rod, wherein the screen box is provided with a set of mesh belt screens, and the flat return mechanism is installed. Between the mesh belt screens, the mesh belt screen surface comprises a large particle sieve surface of 100-625 holes per square meter or a medium particle sieve surface of 626-4300 holes per square meter or 4301 holes per square meter - a 250,000-hole small particle screen surface, or a combination of two or three of said screen surfaces, said mesh belt screen surface connecting drive mechanism, said small particle mesh belt screen outside the bottom layer Equipped with a sloping discharge slide.

The industrial and mining mesh belt screen, the large-grain mesh belt screen or the medium-grain mesh belt screen is located above the small particle mesh belt screen, the large medium-grain mesh belt screen and small particle net A guide plate is arranged between the screens, and the discharge slide plate is a set of inclined plates arranged opposite to each other at an inclination angle of 3-10 degrees, and the concave bottom surface formed by the inclined plate is provided with a small particle discharge mechanism. The discharge slide of the small particle mesh screen located on the bottom layer is a collection plate.

In the industrial and mining mesh belt screen, the mesh belt screen has parallelly arranged chain sides on both sides of the sieve surface, and the chain strips are provided with a sieve surface composed of sieve sheets; the small particle mesh belt The sieve surface has an inclination angle of 0 to 5 degrees, and the large particle mesh belt sieve or the medium particle mesh belt sieve has a sieve surface inclination angle of 0 to 4 degrees, and the small particle mesh belt screen chain has a chain covering the chain. An inverted L-shaped rib is connected with a baffle plate between the chain and the screen box, or the chain on both sides has a rib perpendicular to the screen surface.

In the industrial and mining mesh belt screen, the horizontal axis of the screen surface passes through the chain or replaces the pin of the chain, and the horizontal axis forms a screen surface by the hinged double loop wire. The end of the horizontal shaft is provided with a nut, and in particular, a tubular nut is provided at the end of the horizontal shaft having a diameter of less than 4 mm.

The industrial and mining mesh belt screen, wherein the screen surface is a steel stranded screen surface, a punched screen surface or a hinged screen surface or a woven screen surface, wherein the large and medium particle mesh screen is in the upper and lower screen surface The guide swash plate is installed, the double loop wire is a punched double ring piece, and the small miscellaneous discharge mechanism is a screw discharge mechanism.

The industrial and mining mesh belt screen, the large particle mesh belt sieve or the medium particle mesh belt sieve has a lead-out plate between the sieve surface and the lower mesh screen surface, or the large particle mesh belt sieve or the medium particle mesh The sieved screen surface is an articulated tab structure to prevent the sieve material from being repeatedly sieved.

The method for physical grading by using the industrial and mining mesh belt screen, starting the driving mechanism of the mesh belt screening work and the flat returning mechanism of the sieve box flat return movement, forming a compound movement mode of the flat return movement and the straight belt movement of the mesh belt, The mixture material is put into the small particle cleaning sieve, and the small particles are sieved into the collection bin through the rolling of the bumps and the flat back movement during the straight process of the mesh belt;

a sieve material comprising large particles, which enters the sieve surface of the large particle mesh belt sieve or the medium particle mesh belt sieve through the guide plate, and the sieve residue material is in the large particle mesh belt sieve or the medium particle mesh The sieved screen surface is collected by the rolling of the bumps and the flat back movement during the straight running of the mesh belt, and the obtained sieved objects are collected;

The large particles left by the sieve are introduced into the collector to complete the preliminary cleaning and grading work.

The method for physical grading by using the industrial and mining mesh belt screen is characterized in that: the driving mechanism for starting the mesh belt screening operation and the flat returning mechanism for the flat movement of the screen box are formed, and the flat back movement and the straight belt movement of the mesh belt are formed. In the compound movement mode, the mixture material is put into the large particle or medium particle mesh belt sieve, and the rolling of the bumps and the flat motion in the straight process of the mesh belt is carried out, and the large particles of the sieve are sieved into the collection bin, and the small particles under the sieve enter. The small particles are cleaned in the sieve, and the grading is completed by the rolling of the bumps and the flat back movement during the straight running of the mesh belt.

A mesh belt screen used in the grain industry is used for sieving and grading of granular materials in the industrial and mining industries, and the mesh belt screen is a mesh belt screen which is sieved under a spiral motion of a combination of a flat back movement and a linear motion.

Invention effect:

Physical grading and grading is the inevitable outcome of the development of industrial refinement. It is the composition of tiny cells that the society is moving forward. The quality of the grading process indirectly or directly affects the development of society. In many industries, such as coal, iron ore, salt mines, and industrial chemical, food and condiment, pharmaceutical, paper, fertilizer, and metallurgy, coal, rubber, petroleum, automotive, ceramics, glass and other industries. Classification of solid particles and powder.

Conventional vibrating screens work by reciprocating rotary vibration generated by vibrator excitation. The upper rotating weight of the vibrator causes a plane to oscillate the surface of the screen, while the lower rotating weight causes the screen surface to produce a cone-shaped rotating vibration. The combined effect of the vibrating effect causes a complex-rotating vibration of the screen surface. The vibration trajectory is projected as a circle on the horizontal plane, and the projection on the vertical plane is an ellipse. Adjust the excitation force of the upper and lower rotary weights to change the amplitude. Adjusting the spatial phase angle of the upper and lower weights can change the curve shape of the screen movement trajectory and change the movement trajectory of the material on the screen surface. For dry material screening, most of them can meet the general needs. For high moisture, there is adhesive material, and vibration during work makes the material adhere more tightly to the screen surface, causing material to be congested or forced to stop. Due to the limitation of working principle, the model consumes relatively high energy.

In the vibrating screen, the linear vibrating screen has higher production efficiency and better classification effect than the circular vibrating screen. During the work process, the dynamic performance of the vibrating screen directly affects the screening efficiency and service life. The vibrating screen uses vibration motor excitation as a vibration source to make the material shake on the screen and is thrown up, while making a jumping linear motion forward. The direction of motion is single, and the blockage cannot be self-clearing. Especially when it is applied to adhesive articles, all the advantages are almost wiped out by the huge energy consumption and the Achilles heel that is easy to block and cannot be continuously produced.

The invention adopts a flat-back motion mechanism, and takes the animal material to make a circular motion. At the same time, the mesh belt is displaced with the animal material in the linear motion, and the final material track is a spiral motion with a sawtooth in the horizontal projection, and the vertical projection surface is a reciprocating rolling. In the materials of different particle sizes, due to the difference in the size of the kinetic energy, the height is graded, and the material smaller than the mesh is screened. As the mesh belt advances, the material advances in the long-distance spiral motion, and finally Thorough cleanup grading.

In the practice of the present invention, when the large particle mesh belt sieve or the medium particle mesh belt sieve is located above the small particle mesh belt sieve, the large medium and small particle mesh belt sieve and the small particle mesh belt sieve are installed between The guide plate, the discharge slide plate is a set of inclined plates arranged opposite each other, so that a plurality of sets of sieve faces are arranged in parallel, and materials passing through a certain level of sieve face can be collected and separated in time, and a set of flat return mechanism can Simultaneous screening of multiple particle sizes is accomplished.

The mesh belt screen of the invention is arranged with two chains arranged in parallel on both sides of the screen surface, wherein the chain is provided with a sieve surface composed of sieve sheets; the chain transmission transmission movement is stable, the bearing capacity is strong, and the small particle net With a sieve screen inclination angle of 0-5 degrees, the large particle mesh belt sieve or the medium particle mesh belt sieve has a screen inclination angle of 0-4 degrees, which is the best material processing effect.

The small particle mesh screen chain of the present invention has an inverted L-shaped rib covering the chain, and a baffle plate is connected between the chain and the screen box, or the chain on both sides It has a rib perpendicular to the screen surface. It can effectively ensure that the spiral moving material will not affect the chain operation and prevent material spillage.

The transverse axis of the mesh belt screen surface of the present invention passes through the chain or replaces the pin shaft of the chain, and the connection is very stable. The horizontal axis forms a screen surface by the hinged double loop wire to form a new one. The sieve surface structure has a remarkable improvement in the rotation performance and the service life is increased several times. a nut is arranged at the end of the horizontal shaft, in particular, a tubular nut is arranged at the end of the horizontal shaft having a diameter of less than 4 mm, so as to adjust the distance between the double loop wires, thereby completing the mesh number. Fine tune. The screen surface of the present invention may also be a conventional steel stranded screen surface, a punched screen surface, a hinged screen surface or a woven screen surface.

The sieve surface of the large-grain mesh belt sieve or the medium-grain mesh belt sieve of the invention can be adopted as a hinged tab structure, and for the easy blockage material, the sieve material can be effectively prevented from being repeatedly sieved.

The physical grading method of the present invention provides a material spiral working environment. Although the motion curve is a non-standard spiral curve according to the particle size and shape of the material, it is effective in a rolling environment in which the circular motion and the linear motion are consistent. Screening, firstly start the driving mechanism of the mesh belt screen and the flat return mechanism of the screen box flat return movement, form a compound movement mode of the flat back movement and the straight belt movement, and put the mixture material into the small particle cleaning sieve, through the net Rolling with the bumps and flat back movements during the straight-through process, the small particulate matter under the sieve is introduced into the collection bin; the sieve residue material including the large particles enters the large-grain mesh belt sieve or the sieve of the medium-grain mesh sieve through the guide plate The sieve residue material is collected in the sieve surface of the large particle mesh belt sieve or the medium particle mesh belt sieve by the bumping and the back movement in the straight process of the mesh belt, and the obtained sieve is collected; The remaining large particles are introduced into the collector to complete the preliminary cleaning and grading work.

Another working mode of the invention is that the driving mechanism of the mesh belt screening operation and the flat returning mechanism of the screen box moving back are firstly started, and a compound movement mode of the flat back movement and the straight belt movement of the mesh belt is formed, and the mixture material is put into the large In the granule or medium granule mesh screen, the rolling of the bumps and the flat back movement during the straight process of the mesh belt, the large particles of the sieved debris are introduced into the collection bin, and the small particles under the sieve enter the small particle cleaning sieve, and pass through the net. Rolling with the bumps and peace back movements during the straight line, complete the grading.

BRIEF DESCRIPTION OF THE DRAWINGS:

Figure 1 is a schematic view of the structure of the product.

Figure 2 is a left side view of Figure 1.

Figure 3 is a schematic view showing the internal structure of the screen box with the sieve screen of the present invention (screening according to the particle size of the material from large to small).

Figure 4 is a schematic view showing the internal structure of the screen box of the present invention (screening large particles first, and then sieving small particles).

Figure 5 is a schematic view showing the internal structure of another screen box in which the large particles are sieved and then the small particles are sieved (the material does not pass through the lower sieve surface of the large particle sieve).

Figure 6 is a left side view of Figure 5.

Figure 7 is a schematic view of the A link of Figure 5;

Figure 8 is a schematic view showing the internal structure of another screen box (first screening small particles and then sieving large medium particles).

Figure 9 is a schematic view of the structure of a small miscellaneous slide with a screw discharge mechanism (which is a plan view of Figure 8).

Figure 10 is a schematic view showing the structure of the double-ring silk small particle mesh belt screen surface of the present invention.

Figure 11 is a left side view of Figure 10 (schematic diagram of the mesh belt).

Figure 12 is a schematic view showing the structure of a sieve mesh screen in a multi-turn double loop yarn of the present invention.

Figure 13 is an enlarged view of a portion B of Figure 12 .

Figure 14 is a schematic view showing the structure of the large particle sieve screen of the present invention.

Figure 15 is a schematic view of the chain structure with L-shaped ribs.

Figure 16 is a schematic illustration of a mesh belt with vertical ribs on the chain.

Figure 17 is a schematic view of the structure of the flat return mechanism (the flat return wheel has a biased hole).

Figure 18 is a schematic view of the anti-running material structure of the screen box with the baffle plate.

Figure 19 is a schematic view showing the structure of a punched double ring sheet.

Detailed ways:

Example 1:

A mesh belt screen for industrial and mining, comprising: a screen frame, wherein the screen frame 1 is connected to the screen box by a boom 2 or a rocker or a pendulum rod, wherein the screen box is provided with a set of mesh belt screens 3, which are flat. The return mechanism 4 is installed between the mesh belt screens, and the mesh belt screen surface comprises a large particle mesh belt screen surface 31 of 100-625 holes per square meter, or a medium particle sieve of 626-4300 holes per square meter. a face 32, or a small particle mesh screen face 33 of 4301 holes - 250,000 holes per square meter, or a combination of two or three of said mesh belt screen faces, said mesh belt screen connection driving mechanism 41, The linear motion is completed under the condition that the screen box is completely circularly moved. An inclined discharge slide 5 is disposed between the upper and lower screen faces of the small particle mesh belt screen located outside the bottom layer.

Example 2:

The industrial and mining mesh belt screen of Embodiment 1, wherein the large particle mesh belt screen or the medium particle mesh belt screen is located above the small particle mesh belt screen, and the small particle mesh belt screen is mounted above There is a guide plate 6, and similarly, for the next sieving length, a guide plate 6 is also installed between the large-grain mesh belt screen or the medium-grain mesh belt screen.

The discharge slide plate is a set of oppositely disposed inclined plates with an inclination angle of 3-10 degrees, and the concave bottom surface formed by the inclined plate is provided with a small particle discharge mechanism 7, and the small particle net located at the bottom layer The discharge slide with the screen is the collection plate 8.

Example 3:

The industrial and mining mesh belt screen of the embodiment 1 or 2, the mesh belt screen is arranged in parallel with a chain 9 on both sides of the screen surface, between the chain is equipped with a screen surface 10 composed of sieve sheets; The small particle mesh screen has a screen inclination angle of 0-5 degrees, and the large particle mesh belt sieve or the medium particle mesh belt sieve has a sieve surface inclination angle of 0-4 degrees, and the small particle mesh belt has a sieve angle on the chain. Having an inverted L-shaped rib 11 covering the chain, a baffle 12 is connected between the chain and the screen box, or the chain on both sides has a rib perpendicular to the screen surface 13.

Example 4:

The industrial and mining mesh belt screen of

embodiment

1 or 2 or 3, wherein the transverse axis 14 of the screen surface passes through the chain or replaces the pin of the chain, between the horizontal axes The screen surface is formed by a hinged double loop wire 15 which is provided with a nut 16 at its end, in particular a tubular nut 17 at the end of said transverse shaft having a diameter of less than 4 mm.

Example 5:

The industrial and mining mesh belt screen of

embodiment

1 or 2 or 3, wherein the screen surface is a steel stranded screen surface, a punched screen surface or a hinged screen surface or a woven screen surface, the large medium mesh network The upper and lower screen faces of the screen are provided with a guide swash plate 18, the double loop wire is a punched double ring piece 21, and the small miscellaneous discharge mechanism is a screw discharge mechanism 71.

Example 6

The industrial and mining mesh belt screen of

embodiment

1 or 2 or 3 or 4 or 5, wherein the large particle mesh belt screen or the medium particle mesh belt screen has a lead-out plate 19 between the upper surface of the screen surface, or The screen surface of the large particle mesh belt sieve or the medium particle mesh belt sieve is an hinged tab structure 20 to prevent the sieve material from being repeatedly sieved.

Example 7

Using the industrial and mining mesh belt screen described in one of Examples 1-6 for physical grading, the driving mechanism 41 for the mesh belt screening operation and the flat return mechanism 4 of the screen box moving back to form a flat return movement and The composite movement mode of the net belt straight movement, the solid particle mixture material is put into the small particle cleaning sieve, and the small particles are sieved into the collection bin through the rolling of the bumps and the flat back movement during the straight process of the mesh belt;

Example 8

Using the industrial and mining mesh belt screen described in one of Examples 1-6 for physical grading, the driving mechanism 41 for the mesh belt screening operation and the flat return mechanism 4 of the screen box moving back to form a flat return movement and The composite movement mode of the net belt straight movement, the mixture material is put into the large particle or the medium particle mesh belt sieve, the rolling of the bumps and the flat back movement in the straight process of the mesh belt, the large particles of the sieve are sieved, and the collection bin is introduced into the collection bin. The small particles enter the small particle cleaning sieve, and the grading is completed by the rolling of the bumps and the flat back movement during the straight process.

Example 9

A mesh belt screen according to any one of embodiments 1 to 6 is used for sieving and grading of granular materials in industrial and mining industries, and the mesh belt screen is sifted in a spiral motion environment in which a combination of flat back motion and linear motion is combined. Net mesh screen.

Claims

The utility model relates to a mesh belt screen for industrial and mining, which comprises: a sieve frame, wherein the sieve frame is connected to the sieve box by a boom or a rocker or a pendulum rod, wherein the sieve box is provided with a set of mesh belts. a sieve, a flat return mechanism is installed between the mesh belt screens, the mesh belt screen surface comprises a large particle sieve surface of 100-625 holes per square meter or a medium particle sieve surface of 626-4300 holes per square meter or a small particle screen of 4301 holes - 250,000 holes per square meter, or a combination of two or three of said screen faces, said mesh belt screen connection driving mechanism, said small particle network outside the bottom layer An inclined discharge slide is arranged between the upper and lower screen faces of the screen.
The mesh belt screen for industrial and mining according to claim 1, wherein said large mesh mesh belt screen or medium particle mesh belt screen is located above said small particle mesh belt screen, said mesh belt A guide plate is arranged between the sieves, and the discharge slide plate is a set of inclined plates arranged opposite to each other at an inclination angle of 3-10 degrees, and the concave bottom surface formed by the inclined plate is provided with a small particle discharge mechanism, which is located at The discharge sled of the small particle mesh screen of the bottom layer is a collecting plate.
The mesh belt screen for industrial and mining according to claim 1 or 2, wherein said mesh belt screen has parallelly arranged chain sides on both sides of said screen surface, said chain being composed of sieve sheets. The sieve surface; the small particle mesh screen has a screen inclination angle of 0-5 degrees, and the large particle mesh belt sieve or the medium particle mesh belt sieve has a sieve surface inclination angle of 0-4 degrees, and the small particle mesh belt The screen chain has an inverted L-shaped rib covering the chain, a baffle is connected between the chain and the screen box, or the chain on both sides has a block perpendicular to the screen surface. side.
A mesh belt for industrial and mining according to claim 1 or 2 or 3, wherein said transverse axis of said screen surface passes through said chain or replaces said pin of said chain, said Between the horizontal axes, the screen faces are formed by hinged double-loop wires, and the ends of the horizontal shafts are provided with nuts, in particular, tubular nuts are arranged at the ends of the horizontal shafts having a diameter of less than 4 mm.
The mesh belt screen for industrial and mining according to claim 1 or 2 or 3, wherein the screen surface is a steel stranded screen surface, a punched screen surface or a hinged screen surface or a woven screen surface, The upper and lower screen faces of the large medium particle mesh screen are provided with a deflecting swash plate, the double loop wire is a punched double ring piece, and the small miscellaneous discharging mechanism is a screw discharging mechanism.
The industrial and mining mesh belt screen according to claim 1 or 2 or 3 or 4 or 5, wherein the large-grain mesh belt screen or the medium-grain mesh belt screen has a sieve surface between the lower surface and the screen surface. The lead-out plate, or the sieve surface of the large-grain mesh belt screen or the medium-grain mesh belt screen is an hinged tab structure to prevent the sieve material from being repeatedly sieved.
A method for physical grading by using the industrial and mining mesh belt screen according to any one of claims 1-8, characterized in that: the driving mechanism for starting the mesh belt screening operation and the flat returning mechanism for the flat movement of the screen box are formed. The compound movement mode of the flat back movement and the straight belt movement of the net belt, the mixture material is put into the small particle cleaning sieve, and the small particles are sieved into the collection bin through the rolling of the bumps and the flat back movement during the straight process of the mesh belt;

a sieve material comprising large particles, which enters the sieve surface of the large particle mesh belt sieve or the medium particle mesh belt sieve through the guide plate, and the sieve residue material is in the large particle mesh belt sieve or the medium particle mesh The sieved screen surface is collected by the rolling of the bumps and the flat back movement during the straight running of the mesh belt, and the obtained sieved objects are collected;

The large particles left by the sieve are introduced into the collector to complete the preliminary cleaning and grading work.
A method for physically classifying industrial and mining mesh belt screens according to any one of claims 1 to 6, characterized in that: a driving mechanism for starting the mesh belt screening operation and a flat returning mechanism for the flat movement of the screen box are formed. The compound movement mode of the flat back movement and the straight belt movement of the net belt, the mixture material is put into the large particle or the medium particle mesh belt sieve, and the rolling of the bumps and the flat back movement in the straight line process, the large particles of the sieve are collected, and the collection is collected. The silo, the small particles under the sieve enter the small particle cleaning sieve, and the grading is completed by the rolling of the bumps and the flat back movement during the straight process of the mesh belt.
A mesh belt screen according to any one of claims 1 to 6 for use in sieving and grading of particulate materials in the industrial and mining industries, characterized in that the mesh belt screen is a spiral motion of a combination of a flat return motion and a linear motion. Screened mesh belt screen.