WO2019091332A1

WO2019091332A1 - Mesh belt plane gyratory screen and grain impurity removal method thereof

Info

Publication number: WO2019091332A1
Application number: PCT/CN2018/113570
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: WO2019091330A1; CN108311389A; CN107716262A; CN108311390A; CN208583594U; WO2019091331A1; CN208373576U; CN109225797A; CN109290190A; WO2019091335A1; CN108372104A; WO2019091334A1; CN208824949U; WO2019091333A1; CN208427375U; CN109290191A; CN108212770A

Abstract

Disclosed is a mesh belt plane gyratory screen, 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 screen surfaces (3); a plane gyratory mechanism (4) is mounted between the mesh belt screen surfaces; the mesh belt screen surfaces comprise a large- and medium-impurity mesh belt screen (31) and a small-impurity mesh belt screen (32); the large- and medium-impurity mesh belt screen and the small-impurity mesh belt screen are respectively connected to a driving mechanism (41); and an oblique impurity discharge sliding plate (5) is provided between upper and lower screen surfaces of the small-impurity mesh belt screen, which is located outside a bottom layer. The mesh belt plane gyratory screen is not easily blocked, has improved sieving capability and sieving effect, and is widely used for classification processing of solid particles in industry and mining and in the manufacturing industry. Further disclosed is a method for removing impurities from grain by using a mesh belt plane gyratory screen.

Description

Net belt flat return sieve and method for carrying out grain removal

Technical field

The invention relates to a large-scale grain cleaning and cleaning device, in particular to an ultra-large grain cleaning and impurity removing device for removing large, medium and small impurities with an processing capacity of 100-500 tons per hour.

Background technique:

At present, there is no large-scale grain cleaning equipment capable of simultaneously removing large, medium and small impurities. The traditional equipment for handling large miscellaneous materials is mainly mesh belt screen and drum screen. The output of mesh belt screen is generally 100-500t/h, and the drum screen is 50. -150t/h, the equipment for processing small and medium miscellaneous is mainly vibrating screen and rotary screen. The output is generally 10-50t/h, and the medium and small miscellaneous screen with the processing capacity above 50t/h is regarded as an advanced large-scale equipment. If you clean 200 tons of raw grain per hour, you need to configure two sets of 100t/h drums for primary cleaning and four advanced 50t/h rotary screens for small and medium-sized, costing up to 800,000, and require four layers of work. Tower, the height is equivalent to 4 stories, the cost is more than 1 million, the sifting equipment plus the working tower plus the installation cost, etc., the comprehensive cost is more than 2 million, and the above costs have not been included in the levee related costs. . Moreover, the energy consumption required for the operation of the equipment is relatively high. The energy consumption of a 100t/h drum primary cleaning screen is 5.5kW, and the energy consumption of a 50t/h vibrating screen is 3.0kW. Therefore, the energy consumption for processing 200 tons of raw grain needs 23kW or more. If you add a hoist, the energy consumption is higher. If you process more than 200 tons of raw grain per hour, you will need more complicated configuration and higher energy consumption. The equipment also needs to be connected with accessories such as splitter and the cost is higher. After the grain harvest comes back, because it can't be put into the warehouse in time, the insects eat, rat, bird, and mold, and lose more than 10% of the harvested grain, solving the initial processing speed of grain is an urgent problem to be solved in the development of the country and the grain industry.

The traditional cleaning of large mesh belts is composed of a feeding hopper, a mesh belt conveying mechanism, a cleaning mechanism and a transmission system. It mainly removes large debris such as straw heads, long straws, bricks, and clods. After the harvest containing the grain naturally falls to the sieve surface, since the grain size of the grain is much smaller than the sieve hole, it falls through the sieve hole and flows to the grain discharge port; and if the particle size or length of the large impurity is larger than the sieve hole, it cannot or cannot pass through the sieve hole. On the screen surface, large impurities are transported to the impurity discharge port along with the advancement of the conveyor belt, thereby separating small particle size harvests such as grain and large impurities.

Since the screening process of the mesh belt screen is free fall, the lower layer is also very susceptible to clogging in the secondary screening. Traditionally, the mesh belt screens are intermittent work, which is used for cleaning up large impurities. It is not suitable for cleaning and mixing. Because the mesh is smaller and more likely to be blocked, it is not used in the industry for cleaning and cleaning.

In addition, cleaning up small miscellaneous, in order to clean up small rice as an example, the traditional cleaning sieve output is generally 30-50 tons / hour, the output of 100 tons / hour of flat cleaning screen only a few manufacturers can produce. The traditional cleaning screen surface is relatively fixed with the screen box, and only the flat back movement is carried out. Some small or broken raw grain is easily stuck in the sieve hole after work, causing the screen surface to be blocked and unable to be cleaned by itself. The screen cleaning mechanism is not Ideally, the worker must clean the sieve surface once a day to clear the sieve hole, which is time consuming and laborious, otherwise it will affect the screening effect.

Summary of the invention:

The object of the present invention is to provide a decontamination device with high processing capacity, high processing capacity, low construction height, low construction cost, and efficient separation of impurities, and a method for removing impurities.

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 decontamination device with high processing capacity, high processing capacity, low construction height, low construction cost, and efficient separation of impurities, and a method for removing impurities. The invention makes the sieved object spirally move, significantly improves the quality of the sieve, and the screening ability is improved significantly.

The object of the invention is achieved in this way:

The mesh belt flat return screen comprises: a screen frame, wherein the screen frame is connected to the screen box by a boom or a rocker or a swing rod, wherein the screen box is provided with a set of mesh belt screen surface, and the flat return mechanism is installed at Between the mesh belt screen surfaces, the mesh belt screen surface comprises a large medium mesh belt flat return screen and a small miscellaneous net belt flat back screen, and the large medium and small mesh belt screen and the small miscellaneous mesh belt screen The driving mechanism is respectively connected, and the inclined meshing slide plate is arranged between the upper and lower screen surfaces of the small mesh belt screen outside the bottom layer.

The mesh belt is flatly sifted, and the large and medium mesh belt screen is placed above the small miscellaneous mesh belt screen, and the grain guiding plate is arranged between the large and medium mesh belt screen and the small miscellaneous mesh belt screen. The slanting slide plate is a set of slanting 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 miscellaneous discharging mechanism, and the small miscellaneous mesh belt located at the bottom layer The sifting slide of the sieve is a collecting plate.

The mesh belt is flatly sifted, and the mesh belt screen is arranged with two parallel rows on both sides of the screen surface, and the chain strip is provided with a sieve surface composed of sieve sheets; the small mesh belt sieve The rake angle is 0-5 degrees, the sieve angle of the large medium mesh screen is 0-4 degrees, and the small mesh belt 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 rib perpendicular to the screen surface.

The mesh belt is flatly sifted, and 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 mesh belt is flat-backed, the screen surface is a punching screen surface or a hinged screen surface or a woven screen surface, the double-ring wire is a punched double-ring piece, and the small-mixing material is spirally out. Material agency.

The mesh belt is flatly sifted, and the sloping plate is arranged in the upper and lower screen surfaces of the large and medium mesh belt flat return screen.

The mesh belt has a flat return screen, and the large medium and small mesh belt has a grain exporting plate between the upper and lower screen faces, or the large and medium mesh belt screen surface is a hinged fin structure to prevent the food from being duplicated under the sieve. Screening.

The mesh belt is flatly sifted, the small miscellaneous discharging mechanism is a spiral discharging mechanism, and the number of the small mesh belt screening holes is 60-80% of the number of screening passages, the large The number of sieve holes of the mesh screen is 2-15 times of the number of sieve passages; the guide swash plate is a small miscellaneous sieve plate, and the guide swash plate has a small miscellaneous discharge mechanism below.

The method for removing grain by using the mesh belt flat back sieve, 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 motion mode of the flat return movement and the straight belt movement of the mesh belt, The material of the mixture including grain after threshing is put into the small miscellaneous cleaning sieve, and the small impurities such as dust, dust and straw fines are introduced into the collection bin through the rolling of the bumps and the flat back movement during the straight process of the mesh belt;

The large amount of sieve material including grain is passed through the guide plate into the large and medium mesh screen, and the sieve material is passed through the mesh belt in the large and medium mesh belt screen. Rolling, sifting the grain and collecting it;

The large amount of debris left in the sieve is introduced into the collector to complete the preliminary cleaning and removing work of the grain and the like.

The method for removing grain by the net belt flat back sieve is carried out, the method for removing the grain is carried out, the driving mechanism for starting the mesh belt screening operation and the flat returning mechanism for the flat movement of the sieve box are formed, and the flat back movement and the mesh belt are straightened. The composite motion mode of the movement, the material of the mixture including the grain after threshing is put into the sieve of the large and medium mesh belt, and the rolling of the bumps and the smooth back movement during the straight process of the mesh belt, the large particles of the sieve are introduced, and the materials are introduced. Collecting bins, the grain and small miscellaneous grains entering the sieve enter the small miscellaneous cleaning sieve, rolling through the bumps and peaceful movements in the process of straightening through the mesh belt, and introducing small impurities such as dust, dust, straw and fines into the collection bin, and the grain is used as The sieve residue enters the granary.

Beneficial effects:

1. The large-scale mesh belt screen of the invention has a high output in the upper mesh belt flat screen, and the same floor space, the single-layer high-processing rice single-stage output can reach 100-300 tons per hour, the same floor space, treatment The ability is increased several times. And we can customize 2000 tons of extra large screens for customers' special needs. In addition, the screen surface of the present invention performs linear motion, and the screen box performs a flat motion to form a compound motion mode. The composite motion enables the screen surface to have a self-cleaning function, and when the screen surface moves to the bending position, the screen hole The blockage will be pulled out or loosened under the flat back movement. When the screen surface moves down, the material on the screen surface will fall due to gravity and peaceful return, thus achieving the effect of cleaning the screen surface, which can greatly save labor. labor force.

The invention adopts a double-ring silk screen surface, which can be easily bent. Since the front line of the sieve contains the flat back movement, the plane screen surface itself is not blocked, and the sieve residue is easy to roll off. In order to prevent the occurrence of the falling of the sieve residue on both sides of the screen surface and the mixing of the undersize, an L-shaped baffle is provided.

The food guiding mechanism of the present invention is a slanted grain guiding plate or a belt conveyor, and the large medium and small mesh belt screen surface and/or the small miscellaneous mesh screen screen surface is equipped with a roller, the traditional The cleaning screen needs to be configured with two types of screens to deal with large and medium and small impurities. It requires several floors of work towers, and there are many suction points. It is necessary to configure multiple pulse dust collectors. The configuration is cumbersome and the lifting height is high. Generally, it is 30. Above the meter, the fall of the grain layer is inevitable, and the crushing and downgrading are inevitable, and the energy consumption required for the operation of the equipment is high, so the comprehensive cost is high. The cleaning sieve of the invention has strong screening ability, and can remove large impurities and remove small and medium impurities, and one cleaning sieve can replace the traditional multiple cleaning sieve combination, and does not require a high working tower, thereby reducing food lifting. The height simplifies the configuration, which saves energy consumption and reduces costs, and significantly improves food grade and quality.

The large miscellaneous sieve of the present invention is an annular mesh belt sieve, and the sieve angle of the large medium mesh screen is 0-4 degrees, and the sieve size of the large medium mesh sieve is larger than that of the sieve. 1.5 times or more of the grain size, the small mesh belt sieve is an annular sieve surface having a composite layer, and the sieve mesh angle of the small mesh belt sieve is 0-5 degrees, and the small miscellaneous mesh belt The mesh size of the sieve is less than 0.8 times the size of the sieved grain to achieve optimal screening parameters.

The lower part of the large and medium mesh belt screen of the invention is provided with a guide grain plate or a belt conveyor, and the sieved objects can be collected and guided to one end, so that the undersize material and the grain are entered from the end of the small mixed sieve, and the whole process is sieved, so that the small impurities can be obtained. More adequate, longer distance screening to improve the screening effect.

The large and medium mesh belt screen of the present invention is provided with a conveying plate, wherein the conveying plate is a set of parallel guiding swash plates, and the grain of the first layer of sieve mesh is concentrated to the starting end of the lower sieve surface. The length of the sieving can be effectively lengthened, and the quality of the sieving can be improved. When the swash plate is used, a large impurity output mechanism is arranged in the outlet direction of the large and medium mesh screen in the lower layer to prevent the sifting. According to the situation of sieving different plant straws, it is sometimes possible to use a discharge slanting plate which discharges to both sides, which can effectively prevent the screening of the secondary screening process.

According to the invention, a plurality of working sieves can be formed into a group of small mesh belt screens, which are arranged in the same screen box on the upper and lower sides, in order to avoid the mixed materials with the lower layer in order to clean the undersize materials, wherein the bottom is from the bottom to the second small The small mesh belt screen of the miscellaneous mesh belt is provided with a slanted out-draft slide plate, and the splayed slide plate may be: a. a set of parallel plates inclined along the mesh belt; or b. 2 oppositely inclined The v-shaped structure, the slanting slide plate inclined along the mesh belt is a v-shaped structure, and the bottom has a spiral discharge mechanism; c. can also be inclined to one side or both sides of the mesh belt (inverted v-shaped structure) In order to facilitate the removal of the undersize material; in order to sift the material with relatively high viscosity of the impurities, in order to update the working performance of the screen, the small mesh screen and/or the large and medium mesh screen are equipped with a cleaning roller or Clean the brush.

Due to the difference in grain size of the original grain, the traditional grain removal machine can only use a kind of equipment for different kinds of mesh, such as cleaning up the impurities of the corn harvest and cleaning up the impurities of the rice harvest. In order to share the equipment of the invention for different food types and reduce the processing or storage unit expenditure, the small miscellaneous mesh belt screen of the invention is respectively provided with a large grain grain mesh screen, a small grain grain mesh screen, and is installed at the bottom of the deflecting swash plate. There is a hinged reversing plate, which can be selectively deflected by manually shifting the direction of the reversing plate, and enters a small miscellaneous mesh belt screen of different size sieve holes, and one device completes the process of removing various miscellaneous grains.

The screen surface of the mesh belt screen of the invention has various forms, and the double-ring wire with the ring on both sides and the horizontal axis can be assembled from the metal wire, or can be formed by sequentially arranging the metal sieve pieces, or braiding the wire. Forming, or stamping, if a sieve piece hinged at one end is used, when running to the lower layer, the sieve surface can be opened, so that the sieve material can be smoothly discharged, avoiding internal plugging, and adopting different types of sieve surface, which can be applied to different kinds of sieves. Raw grain screening requirements.

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.

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 of the internal structure of the screen box of the present invention (first except for small impurities, and then the grain is passed through the large and medium-sized lower layer screen surface).

Figure 4 is a schematic view showing the internal structure of the screen box with the sieve surface of the present invention (first except for the large and medium impurities, and then the small amount of impurities, the grain does not pass through the lower sieve surface).

Figure 5 is a schematic view showing the internal structure of another screen box in which the present invention is first removed and then mixed with small impurities (the grain does not pass through the lower screen).

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 of the structure of a small miscellaneous slide with a screw discharge mechanism (which is a plan view of Figure 3).

Figure 9 is a schematic view showing the structure of the double loop wire mesh belt of the present invention.

Figure 10 is a left side view of Figure 9 (schematic diagram of the mesh belt).

Figure 11 is a schematic view showing the structure of the multi-circle double-ring filament large and medium-sized mesh belt screen of the present invention.

Figure 12 is an enlarged view of a portion B of Figure 11 .

Figure 13 is a schematic view of a chain structure with an L-shaped rib.

Figure 14 is a schematic illustration of a mesh belt with vertical ribs on the chain.

Figure 15 is a schematic view of the structure of the flat return mechanism (the flat return wheel has a depending hole).

Figure 16 is a schematic view of the anti-running material structure of the screen box with the retaining plate.

Figure 17 is a schematic view showing the structure of the swash plate as a small sieve.

Detailed ways:

Example 1:

The mesh belt flat return screen comprises: a screen frame 1 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 flat return screen 3, flat The return mechanism 4 is installed between the mesh belt flat return screens, and the mesh belt flat return screen comprises a large medium mesh belt flat return screen 31 and a small miscellaneous net belt flat return screen 32, the large and medium miscellaneous The mesh belt screen and the small miscellaneous net screen are connected to the driving mechanism 41, and the inclined meshing slides 5 are arranged between the upper and lower screen surfaces of the small mesh belts outside the bottom layer.

Example 2:

The mesh belt flat back sieve described in Embodiment 1 is provided with a guide between the large and medium mesh belt screen and the small miscellaneous mesh belt screen when the large medium and medium mesh belt screen is located above the small miscellaneous mesh belt screen. The grain board 6 is a set of inclined plates arranged to face each other at an inclination angle of 3-10 degrees, and the concave bottom formed by the inclined plate is provided with a small miscellaneous discharging mechanism 7 at the bottom layer. The small miscellaneous net with the screen of the sifting skateboard is the collecting plate 8.

Example 3:

The mesh belt flat back screen according to the embodiment 1 or 2, wherein the mesh belt screen has parallelly arranged chain sides 9 on both sides of the screen surface, and the screen strips are provided with a screen surface 10 composed of sieve sheets; The small mesh screen and the large and medium mesh screen respectively have a driving mechanism for mesh belt movement, and the small mesh screen has a screen inclination angle of 0-5 degrees, and the sieve surface of the large medium mesh screen The angle of the inclined mesh is 0-4 degrees, and the small mesh belt screen chain has an inverted L-shaped rib 11 covering the chain, and a baffle plate 12 is connected between the chain and the screen box. Or the chain on both sides has a rib 13 perpendicular to the screen surface.

Example 4:

The mesh belt flat return 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, and the horizontal axis is hinged The double loop wire 15 constitutes a screen surface, and the end of the horizontal shaft is provided with a nut 16, and in particular, a tubular nut 17 is attached to the end of the horizontal shaft having a diameter of less than 4 mm.

Example 5:

The mesh belt flat screen according to

embodiment

1 or 2 or 3, wherein the screen surface is a punched screen surface or a hinged screen surface or a woven screen surface.

Example 6

The mesh belt flat back screen according to the

embodiment

1 or 2 or 3 or 4 or 5, wherein the large and medium mesh belt flat return screen is provided with a deflecting swash plate 18 in the upper and lower screen surfaces, and the deflecting swash plate The high end is located on the side of the grain entrance.

Example 7

The mesh belt flat back sieve according to

Embodiment

1 or 2 or 3 or 4 or 5, wherein the large medium mesh screen has a grain exporting plate 19 between the upper and lower screen faces, or the large medium mesh screen The surface is an articulated tab structure 20 to prevent repeated screening of the undersize grain.

Example 8

The mesh belt flat back screen of

Embodiment

1 or 2 or 3 or 4 or 5 or 6 or 7, the small miscellaneous discharge mechanism is a spiral discharge mechanism 71, and the number of sieve holes of the small miscellaneous mesh belt For the number of sieve passages of 60-80%, the number of sieve holes of the large mesh belt sieve is 2-15 times the number of sieve passages; the guide swash plate is a small sieve sieve 21, A small miscellaneous discharge mechanism 22 is disposed under the deflector.

Example 9

The method for removing grain by using the mesh belt flat back sieve described in one of Embodiments 1-8, starting the driving mechanism 41 of the mesh belt screening work and the flat returning mechanism 4 of the screen box moving back to form the flat return movement and the net The compound movement mode with straight motion, the material of the mixture including the grain after threshing is put into the small miscellaneous cleaning sieve, and the rolling of the dust and the straw is fined by the rolling of the bumps and the smooth back movement during the straight process of the mesh belt. Introducing small impurities into the collection bin;

The sieve material of the large particles including the grain enters the large and medium mesh screen through the guide plate 23, and the sieve material is bumped and moved back through the mesh belt in the large and medium mesh screen. Rolling, sifting the grain and collecting it;

Example 10:

A method for removing grain by using a mesh belt flat back sieve according to any one of Embodiments 1-8, a driving mechanism 41 for starting the mesh belt screening operation and a flat returning mechanism 4 for moving the screen box to form a flat return movement. And the combined movement mode of the net with straight movement, the material of the mixture including the grain after threshing is put into the sieve of the large and medium mesh belt, and the rolling of the bumps and the flat back movement during the straight process of the mesh belt, the large particles of the sieve The sundries are introduced into the collection bin, and the grain and small miscellaneous grains under the sieve enter into the small miscellaneous cleaning sieve, and the rolling of the bumps and the flat back movement during the straight process through the mesh belt, and the small impurities such as dust, dust, straw and fines are introduced and collected. Warehouse, grain as a sieve residue into the granary.

Claims

The utility model relates to a mesh belt flat return screen, which comprises: a sieve frame, wherein the sieve frame is connected to the sieve box by a boom or a rocker or a swing rod, wherein the sieve box is provided with a set of mesh belt screen faces. a flat return mechanism is installed between the mesh belt screens, and the mesh belt screen surface comprises a large medium mesh belt flat return screen and a small miscellaneous net belt flat back screen, and the large medium mesh screen And the small mesh belt screen is respectively connected to the driving mechanism, and the small miscellaneous mesh belt outside the bottom layer is provided with a tilting and outgoing sliding board between the upper and lower screen surfaces.
The mesh belt flat return screen according to claim 1, wherein: the large medium mesh screen is located above the small mesh screen, the large medium mesh screen and the small mesh screen A guide grain plate is arranged between the plurality of sliding plates, wherein the inclined plates are inclined at an angle of 3-10 degrees, and the concave bottom formed by the inclined plates is provided with a small miscellaneous discharging mechanism, and is located at the bottom layer. The small miscellaneous mesh screen of the excavation skateboard is a collecting plate.
The mesh belt flat return screen according to claim 1 or 2, wherein: said mesh belt screen has parallelly arranged chain sides on both sides of the screen surface, and said screen strips are provided with sieve faces composed of sieve sheets. The small mesh belt screen has an inclination angle of 0-5 degrees, and the large medium mesh screen has a screen inclination angle of 0-4 degrees, and the small mesh belt screen chain has the cover The inverted L-shaped rib of the chain 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.
A mesh belt flat return screen according to claim 1 or 2 or 3, wherein said horizontal axis of said screen surface passes through said chain or replaces a pin of said chain, said horizontal axis The screen faces are formed by articulated double-ring wires, the ends of which are provided with nuts, in particular with tubular nuts at the ends of said transverse shafts having a diameter of less than 4 mm.
The mesh belt flat return screen according to claim 1 or 2 or 3 or 4, wherein the screen surface is a punched screen surface or a hinged screen surface or a woven screen surface, and the double loop wire is punched. The double ring piece, the small miscellaneous discharging mechanism is a screw discharging mechanism.
The mesh belt flat return screen according to claim 1 or 2 or 3 or 4 or 5, wherein the large and medium mesh belt flat back screen is provided with a deflecting swash plate in the upper and lower screen surfaces.
The mesh belt flat return screen according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein: said large medium mesh belt screen has a grain exporting plate between the upper and lower screen faces, or said The large and medium mesh screen has a hinged surface structure to prevent repeated screening of the grain under the sieve.
The mesh belt flat return screen according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, wherein the small miscellaneous discharge mechanism is a screw discharge mechanism, and the small miscellaneous mesh belt The number of sieve holes is 60-80% of the number of sieve passages, and the number of sieve holes of the large mesh belt sieve is 2-15 times the number of sieve passages; the guide swash plate is small miscellaneous The sieve plate has a small miscellaneous discharging mechanism under the guiding swash plate.
A method for removing grain by using a mesh belt flat return 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 into a flat The composite movement mode of the back movement and the net belt straight movement, the material of the mixture including the grain after threshing is put into the small miscellaneous cleaning sieve, and the dust and the dust are sieved under the rolling of the bumps and the flat movement in the straight process of the mesh belt. Small impurities such as straw fines are introduced into the collection bin;

The large amount of sieve material including grain is passed through the guide plate into the large and medium mesh screen, and the sieve material is passed through the mesh belt in the large and medium mesh belt screen. Rolling, sifting the grain and collecting it;

The large amount of debris left in the sieve is introduced into the collector to complete the preliminary cleaning and removing work of the grain and the like.
The invention relates to a method for removing impurities by using a mesh belt flat back sieve according to any one of claims 1-8, and a method for removing impurities in a grain, which is characterized in that: a driving mechanism for starting the mesh belt screen and a flat movement of the screen box The flat-back mechanism forms a compound movement mode of the flat-back movement and the straight-line movement of the net belt. The material of the mixture including the grain after threshing is put into the sieve of the large and medium-sized mesh belt, and the bumps and peace back through the net belt straightening process. Rolling of the movement, screening the large particles of debris, into the collection bin, the grain and small miscellaneous under the sieve into the small miscellaneous cleaning sieve, rolling through the net belt straight through the bumps and smooth back movement, sifting dust and dust straw Small impurities such as fines are introduced into the collection bin, and the grain is used as a sieve residue to enter the granary.