CN115350924A - Vibration screening machine - Google Patents

Abstract

The invention discloses a vibrating screening machine in the technical field of screening machines, which includes a height limiting mechanism, a screening mechanism, a body, a feeding mechanism and a controller. The body is a stably supported frame, and a horizontal the workbench; the controller is arranged inside the machine body; the feeding mechanism includes a feeding tray and a feeding vibrator, and the feeding tray is stably erected on the top of the workbench, and the feeding vibrator is attached to the bottom of the feeding tray, Capable of automatic screening of capacitor or inductor products, through the sorting board to screen out capacitors and scraps that are smaller than qualified products, and limit the height of the screened products through the height limit device, and the height can be adjusted, which is convenient for limiting grains of different thicknesses. In this way, it is avoided that the products that are connected with each other but have the same cross-section are misselected due to vibration jumping, and are screened out from the screening conditions to improve the yield rate of automatic screening.

Description

A vibrating screening machine

technical field

The invention relates to the technical field of screening machines, in particular to a vibrating screening machine.

Background technique

In the production process of chip capacitors and poles, they need to be produced into larger sheet-like products, and then cut into small grains one by one. The size of this cutting needs to meet the requirements of use, and the requirements are relatively strict. It can’t be too big or small, and the error can only be used if the difference is less than 0.02mm. The size of the capacitor grain is determined according to the product model. These models are determined by the size of the capacitor grain, and it is generally a cuboid. Powder and scraps will be generated, which will cause the capacitors after cutting to be stained with powder, mixed with useless scraps, some leftovers, and capacitor grains that are not cut off. The unqualified capacitors are: upper and lower Superimposed on the rights and interests, there are long strips that are not cut in the front and rear directions, and there are also those that are cut to the wrong size. Therefore, the cut capacitors need to be screened to remove powder and material.

There are a large number of these, and it is difficult to screen, and often unqualified capacitors will be recycled, because this kind of granular capacitor needs to be installed in other equipment, and the error correction ability is poor. It is difficult to find whether the capacitor meets the requirements by naked eye observation or camera screening. If it is found that the particles are too large to be installed, it will cause more trouble when they need to be replaced. Therefore, there is a high requirement for the pass rate of this small particle capacitor screening. The current screening device often eliminates defective products through multiple screenings, and cannot Solve the problem from the root cause, such as two capacitor products connected front and back, the cross section of this defective product is the same as that of the qualified product, and the vertical one can still pass the conventional screening method, and the front and rear dimensions If it is too large, it cannot be screened out, and if the thickness of the upper and lower layers is too large, it can also pass through, resulting in a high defect rate and fewer screening methods.

Based on this, the present invention has designed a kind of vibration screening machine, to solve the above-mentioned problems.

Contents of the invention

The purpose of the present invention is to provide a vibrating screening machine that can automatically screen capacitor products, screen out capacitors that are smaller than qualified products through a sorting plate, and limit the height of the screened products through a height limiting device, and the height can be adjusted, which is convenient for different thicknesses. The crystal grains are limited, thereby avoiding the products that are connected to each other but have the same cross section, which may cause misselection due to vibration jumping, and improve the yield rate of automatic screening.

The present invention is achieved in that a kind of vibration screening machine comprises:

Height limit mechanism, screening mechanism, machine body, feeding mechanism and controller;

The body is a stably supported frame, and a horizontal workbench is stably erected on the top of the body; the controller is arranged inside the body;

The feeding mechanism includes a feeding tray and a feeding vibrator, and the feeding tray is stably erected on the top of the workbench, and the feeding vibrator is attached to the bottom of the feeding tray;

The screening mechanism stabilizing frame is installed on the workbench, and the screening mechanism includes a sorting plate and a screening plate, both of which are screen plates, and the sorting plate is connected to the rear side of the feeding tray, The screening plate is connected to the rear of the screening plate, vibrators are arranged at the bottom of the screening plate and the screening plate, and the screening plate and the screening plate are on the same continuous plane;

The height limiting mechanism includes a fixed frame, a balance piece, a horizontal frame and a height limiting plate. The fixed frame is stably erected on the screening mechanism. The balance part can be adjusted up and down, locked and hung on the horizontal frame, and the height limit plate can be individually adjusted in each direction and suspended on the balance part. The height limit plate is not in contact with the screening plate above;

The vibrators in the feeding vibrator and the screening mechanism are all connected with the controller.

Further, a recovery box and a finished product box are arranged on the top of the workbench, and both the recovery box and the finished product box are collection boxes with an opening at the top;

The inside of the body is also provided with a dust collection bucket, the air outlet of the dust collection bucket is connected with a vacuum cleaner, the suction port of the dust collection bucket protrudes above the workbench, and a bag-shaped air bag is arranged inside the dust collection bucket. filter;

The bottom of the body is also provided with a plurality of rollers and a plurality of supporting feet, and the plurality of supporting feet are distributed on the bottom of the body in a rectangular shape. wheel.

Further, the feeding mechanism also includes a feeding hopper, the feeding hopper is a funnel-shaped structure with a large top and a small top opening, the feeding tray is received directly below the outlet at the bottom of the feeding hopper, and the bottom of the feeding tray A feeding vibrator is provided, the rear end of the feeding pan is connected with a bulk material trough plate, a dust suction plate is arranged under the rear end of the bulk material chute plate, and the rear side of the dust suction plate is connected with a splitter trough plate, so An air knife and a wind hood are set up above the dust collection board, the blowing direction of the air knife is facing the dust collection board, the air knife is connected with the blower inside the body, and the dust collection board is connected with the suction of the dust collection bucket. The air port is sealed with the windshield;

Both the bulk material chute and the splitter chute are corrugated plates with a circular arc-shaped groove cross-section, and the front and rear directions of the corrugated grooves of the bulk material chute and the splitter chute are unobstructed;

There are two dust-absorbing boards, one of which is arranged with the rear side of the dust-absorbing board inclined downwards, and the other dust-absorbing board is vertically connected to the rear edge of the bulk material chute, and the bulk material chute is connected to the two A dust-absorbing board is connected into a step shape, and the dust-absorbing board is a mesh board.

Further, the screening mechanism also includes a receiving plate, a deriving plate, a partition bar and a material guide trough, the receiving plate and the deriving plate are smooth flat plates, and the receiving plate is seamlessly connected between the splitter trough plate and the sorting plate , there are two sorting plates, the two sorting plates are connected to each other in the front and rear directions, and the vibration frequencies of the two sorting plates are different;

There are at least two dividers, and the two dividers are fixed and arranged on the top of the sorting plate parallel to each other, and the sorting plate is divided into three traveling channels by the two dividers;

The export plate is seamlessly connected to the rear end of the screening plate, the recovery box is connected to the edge of the rear end of the export plate, and a material guide groove is also set under the screening plate, and the material guide groove is a concave hole with openings on the rear side and the top. The front side and the left and right sides of the guide trough are closed at the bottom of the screening plate, the rear side of the guide trough is inclined downward, the screening plate is within the receiving range of the guide trough, and the top of the finished box The opening is directly below the opening at the rear end of the material guide groove;

The bottom of the sorting plate and the screening plate are also connected with the suction port of the dust bucket;

The meshes on the sorting plate and screening plate are evenly distributed in multiple rows, and the front and rear directions of each row of meshes are not on the same straight line.

Further, the height limiting mechanism also includes a micrometer screw, a guide groove, a balance piece, an adjustment rod, a slider, a pre-tightening guide rod, a cross frame and a locking hole;

There are two fixing frames, and a plurality of locking holes are horizontally opened at the bottom of the two fixing frames. A horizontal frame is erected between the fixed frames, and the horizontal frame spans the left and right sides of the screening plate, and each of the fixed frames is provided with a guide groove on the vertical inner wall facing the screening plate;

There are two balance pieces, the balance piece is a block, the top of the balance piece is connected with a micrometer screw and a pre-tightening guide rod, and the two balance pieces are respectively hoisted on the left and right sides of the horizontal frame through the micrometer screw. On the side, the pre-tightening guide rod is vertically slid on the cross frame, and the pre-tightening guide rod and the cross frame are pre-tensioned by springs, the vertical side wall of the balance piece is provided with a slider, and the The slide block is vertically slid in the guide groove, at least two adjustment rods are vertically arranged at the bottom of each balance piece, the height limiting plate is a square flat plate, and the screening plate is within the coverage of the height limiting plate. The four corners of the height limiting plate are hoisted on four adjusting rods through threads, the four adjusting rods are distributed in a rectangle, and the four adjusting rods are symmetrical with respect to the horizontal and vertical centerlines of the height limiting plate.

The beneficial effects of the present invention are: 1. The present invention can limit the passing thickness through the height limiting mechanism, so that thicker products cannot be vertical on the screening plate, but can continue to move forward, thereby ensuring that the thickness and length exceed the standard. Good products will not pass through the mesh of the screening plate vertically due to vibration;

2. The height limit plate of this device can not only adjust the height, but also adjust the height in each direction, so as to achieve the purpose of adjusting the balance angle of the height limit plate, so as to ensure that every part of the height limit plate is kept parallel to the screening plate, and can Effectively prevent capacitor grains from lifting vertically in the internal cracks, effectively improving the pass rate;

3. This device only uses the combination of the screening plate and the sorting plate of the single-layer sieve. The simpler and more compact structure achieves the purpose of automatic screening. The vibration does not need to pass through the multi-layer sieve plate, and can vibrate directly, so that the vibration can be accurate Adjustment, without trial and error, and the effect rate is higher, and the pass rate is also higher.

Description of drawings

The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is the structural representation of another side of the present invention;

Fig. 3 is a schematic structural view of the feeding mechanism of the present invention;

Fig. 4 is a structural schematic diagram of the height limiting mechanism of the present invention;

Fig. 5 is a schematic diagram of the assembly structure of the fixing frame and the balancer of the present invention;

Fig. 6 is a schematic diagram of the screening mechanism of the present invention;

Fig. 7 is a schematic diagram of mesh distribution on the sorting board of the present invention;

Fig. 8 is a schematic diagram of the mechanism distribution above the workbench of the present invention;

Fig. 9 is a schematic diagram of the positions of the feeding tray and the feeding vibrator of the present invention;

Fig. 10 is a schematic diagram of the position of the dust collecting bucket and the vacuum cleaner in the body of the present invention;

Fig. 11 is a schematic diagram of cooperation between the material guide groove and the finished box of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

1-height limit mechanism, 11-thousand-point screw, 12-fixed frame, 121-guide groove, 13-balance piece, 131-adjusting rod, 132-slider, 14-preload guide rod, 15-horizontal frame, 16 -Locking hole, 17-height limit plate, 2-screening mechanism, 21-sorting plate, 22-screening plate, 23-receiving plate, 24-exit plate, 25-dividing strip, 26-material guide trough, 3- Body, 31-working table, 32-dust bucket, 33-recycling box, 34-finished product box, 35-rollers, 36-supporting feet, 37-vacuum cleaner, 4-feeding mechanism, 41-feeding tray, 411-feeding Hopper, 42-bulk trough plate, 43-dust suction plate, 44-splitter trough plate, 45-feeding vibrator, 46-air knife, 47-beam wind cover.

Detailed ways

Please refer to Figures 1 to 11, the present invention provides a technical solution: a vibration screening machine, comprising:

Height limit mechanism 1, screening mechanism 2, machine body 3, feeding mechanism 4 and controller 5;

The body 3 is a stably supported frame, and a horizontal workbench 31 is stably erected on the top of the body 3; the controller 5 is arranged inside the body 3;

The feeding mechanism 4 includes a feeding tray 41 and a feeding vibrator 45, the feeding tray 41 is stably erected on the top of the workbench 31, and the feeding vibrator 45 is attached to the bottom of the feeding tray 41;

Described screening mechanism 2 stabilizing frames are contained on the workbench 31, and described screening mechanism 2 comprises sorting plate 21 and screening plate 22, and described sorting plate 21 and screening plate 22 all are screen boards, and described sorting plate 21 is connected to the rear side of the feeding tray 41, and the screening plate 22 is connected to the rear of the sorting plate 21, and vibrators are arranged at the bottom of the sorting plate 21 and the screening plate 22, and the sorting plate 21 and the screening plate 22 are in the continuous on the same plane;

The height limiting mechanism 1 includes a fixed frame 12, a balance piece 13, a horizontal frame 15 and a height limiting plate 17. The fixed frame 12 is stably erected on the screening mechanism 2, and the horizontal frame 15 is stabilized left and right by the fixed frame 12. Straddling directly above the screening plate 22, the balance piece 13 can be adjusted up and down, locked and suspended on the cross frame 15, and the height-limiting plate 17 can be individually adjusted in height and suspended on the balance piece 13 Above, the height limiting plate 17 is directly above the screening plate 22 without contact;

The feeding vibrator 45 and the vibrator in the screening mechanism 2 are all connected to the controller 5, which can automatically screen the capacitor products, and the capacitors smaller than the qualified products are screened out through the sorting plate, and the height of the screened products is limited by the height limiting device 1 , and the height can be adjusted, which is convenient for restricting particles of different thicknesses, thus avoiding the misselection of products that are connected to each other but have the same cross-section due to vibration jumping, and can be screened out from the screening conditions to improve Yield rate for automatic screening.

Wherein, the top of the workbench 31 is provided with a recovery box 33 and a finished product box 34, and the recovery box 33 and the finished product box 34 are collection boxes with top openings;

The inside of the body 3 is also provided with a dust collection bucket 32, the air outlet of the dust collection bucket 32 is connected with a vacuum cleaner 37, and the suction port of the dust collection bucket 32 stretches out above the workbench 31, and the dust collection bucket 32. Bag-shaped air filter is set inside;

The bottom of the body 3 is also provided with a plurality of rollers 45 and a plurality of supporting feet 36, and the plurality of supporting feet 36 are distributed in the bottom of the body 3 in a rectangular shape, and the supporting feet 36 are stably installed on the bottom of the body 3 through a screw rod. , the roller 35 is a universal wheel, which can be stably supported by the setting of the workbench 31, and the top of the whole workbench 13 achieves a basic sealing structure, the side is closed by sheet metal, and the top opening is used as the opening for installing the screening mechanism 2, and through The integrated barrel 32 provides negative pressure suction to the screening mechanism 2;

The feeding mechanism 4 also includes a feeding hopper 411, the feeding hopper 411 is a funnel-shaped structure with a large top and a small top opening, and the feeding tray 41 is received directly below the outlet at the bottom of the feeding hopper 411. The bottom is provided with a feeding vibrator 41, and the rear end of the feeding tray 41 is connected with a bulk material chute 42, and a dust suction plate 43 is arranged below the rear end of the bulk material chute 42, and the rear side of the dust suction plate 43 The splitter trough plate 44 is connected, and an air knife 46 and a wind hood 47 are set up above the dust suction plate 43. The air blower is connected, and the dust suction plate 43 is sealed and connected with the suction port of the dust collecting barrel 32 and the air beam hood 47;

The bulk material channel plate 42 and the distribution channel plate 44 are all corrugated plates with a circular arc-shaped groove cross section, and the front and rear directions of the corrugated channels of the bulk material channel plate 42 and the distribution channel plate 44 are unobstructed;

There are two dust-absorbing plates 43, one of which is inclined downward at the rear side of the dust-absorbing plate 43, and the other is vertically connected to the edge of the rear side of the bulk material trough plate 42, and the bulk material is The trough plate 42 is connected to two dust-absorbing plates 43 to form steps. The dust-absorbing plate 43 is a mesh plate, which is convenient to disperse the material evenly and spread the material evenly, so that the dust on the material is easy to be cleaned and spread. Finally, the materials are fully screened;

The screening mechanism 2 also includes a receiving plate 23, a deriving plate 24, a divider bar 25 and a material guide trough 26. The receiving plate 23 and the deriving plate 24 are smooth flat plates, and the receiving plate 23 is seamlessly connected between the distribution channel plate 44 and the distribution channel. Between the selection boards 21, there are two selection boards 21, the two selection boards 21 are connected to each other in the front and back directions, and the vibration frequencies of the two selection boards 21 are different;

There are at least two divider strips 25, and the two divider strips 25 are fixedly arranged on the top of the sorting plate 21 parallel to each other, and the sorting plate 21 is divided into three traveling passages by the two divider strips 25;

The outlet plate 24 is seamlessly connected to the rear end of the screening plate 22, and the recycling box 33 is connected to the edge of the rear end of the outlet plate 24. A material guide groove 26 is also provided below the screen plate 22, and the material guide groove 26 is A groove with openings on the rear side and top, the front side and left and right sides of the material guide groove 26 are closed at the bottom of the screening plate 22, the rear side of the material guide groove 26 is inclined downward, and the screening plate 22 is in the material guide groove 26, the top opening of the finished product box 34 is received directly below the opening of the rear end of the material guide trough 26;

The bottoms of the sorting plate 21 and the screening plate 22 are also connected with the suction port of the dust bucket 32;

The meshes on the sorting plate 21 and the screening plate 22 are evenly distributed in multiple rows, and the front and rear directions of each row of meshes are no longer on the same straight line, and the mesh size of the sorting plate 21 is smaller than the cross-sectional size of qualified products , and the size difference is not more than 0.02mm; the mesh size of the screening plate 22 mesh size is the same as the size of the qualified product, and the error is not more than 0.05mm, the mesh size belongs to conventional technology, as long as the mesh size is selected It can be done, but if the meshes are arranged in a rectangular array, many grains will not be screened by the meshes, and it is easy to pass through directly. Each row of meshes is in a straight line along the left and right directions. The meshes in each row are parallel to each other, and the materials are screened out through the screening plate 22 and the sorting plate 21, and the inside of the screening mechanism 2 is also sealed to a certain extent, so that the inside is always under the negative pressure of the dust collection bucket 32 Suction, transfer the negative pressure to the sorting plate 21 and the screening plate 22, so that there is a certain negative pressure in the entire space of the screening mechanism 2;

The height limiting mechanism 1 also includes a micrometer screw 11, a guide groove 121, a balance member 13, an adjustment rod 131, a slider 132, a pre-tightening guide rod 14, a cross frame 15 and a locking hole 16;

There are two fixed frames 12, and a plurality of locking holes 16 are horizontally opened at the bottom of the two fixed frames 12, and the two fixed frames 12 are fixed on the left and right sides of the screening plate 22 through bolts and locking holes 16. On the side, a horizontal frame 15 is erected between the two fixed frames 12, and the horizontal frame 15 spans the left and right sides of the screen plate 22, and each of the fixed frames 12 is arranged on the vertical inner wall of the screen plate 22. A guide groove 121 is formed;

There are two balance pieces 13, the balance piece 13 is a block, the top of the balance piece 13 is connected with the micrometer screw 11 and the pre-tightening guide rod 14, and the two balance pieces 13 are symmetrical through the micrometer screw 11 are respectively hoisted on the left and right sides of the cross frame 15, the pre-tightening guide rod 14 is vertically slid on the cross frame 15, and the pre-tightening guide rod 14 and the cross frame 15 are pre-tensioned by a spring, the The vertical side wall of the balance piece 13 is provided with a slide block 132, and the slide block 132 is vertically slid in the guide groove 121, and at least two adjustment rods 131 are vertically arranged at the bottom of each of the balance piece 13. The height limit plate 17 is a square flat plate, and the screening plate 22 is within the coverage of the height limit plate 17. The four corners of the height limit plate 17 are hoisted on four adjustment rods 131 by threads, and the four adjustment rods 131 form Rectangular distribution, and four described adjusting rods 131 are all symmetrical with respect to the horizontal and vertical center line of height limiting plate 17, and height limiting mechanism 1 can limit the jumping height that the material is subjected to vibration, and can control the fixed position of height limiting plate 17 Micro-distance adjustment, the adjustment is more precise, the height limit of the material is more accurate, and the screening conditions are more accurate.

In a specific embodiment of the present invention:

The embodiment of the present invention provides a vibrating screening machine. The technical problems encountered in the present invention are: 1. Many industries now need to use capacitors with smaller particles, the size of which is only the size of a grain of rice, and is generally rectangular. The width is 0.34, the length is 0.66, and the thickness is 0.38. Such capacitor grains require high precision, and the general error must not exceed 0.3mm. It is impossible to use cameras and manual screening during screening. Currently, screening It can only rely on the mesh plate, which is a conventional method, as long as the mesh is made to meet the size of the standard product, but manual screening is slow and when there is a vertical grain, it will directly pass through the screening plate 22 Causes defective products to be mixed into qualified products, resulting in a low rate of good products; 2. The current screening device is through multiple screenings to reduce the rate of defective products. It can only eliminate more defective products through repeated actions, but More qualified products will also be eliminated, resulting in waste of resources; 3. This kind of product pays more attention to the yield rate of screening. Although the yield rate has been improved through multiple screenings, the current screening method will still mix unqualified products into qualified products. In the product, for example, if the cross-section of a larger product is 1mm square, and the length exceeds 2mm, this product will still pass through the 22-mesh screening plate with a length of 2mm and a width of 1mm after standing upright, so repeated screening will only increase the number of defective products. The probability of passing, but it cannot be prevented from passing.

The technical problem solved by the present invention is: through the height-limiting plate of the height-limiting mechanism, all capacitors are prevented from standing upright, so that all capacitor crystal grains can be subjected to vibration and continue to advance on the screening plate 22, avoiding blockage, but being limited by the height. It will not pop up and stand upright, effectively improving the yield rate of the products collected by the finished box 34 in essence, rather than by reducing the efficiency and passing through repeated screening.

The technical effects achieved are: 1. The present invention can limit the thickness of the capacitor crystal grains passing through the height limiting mechanism 1, so that thicker products cannot be vertical on the screening plate 22, but can continue to move forward, thereby ensuring Defective products whose thickness and length exceed the standard will not pass through the mesh of the screening plate 22 vertically due to vibration, and can continue to move forward on the screening plate 22 and fall into the recovery unit 33 for collection;

2. The height limit plate 17 of this device can not only adjust the height, but also adjust the height of each direction, so as to achieve the purpose of adjusting the balance angle of the height limit plate 17, so as to ensure that every part of the height limit plate 17 is in line with the screening plate 22 Keeping parallel can effectively prevent the capacitor grains from lifting vertically in the internal gap between the height-limiting plate 17 and the screening plate 22, effectively improving the pass rate;

3. This device only uses the combination of the screening plate 22 and the sorting plate 21 of the single-layer sieve. The simpler and more compact structure achieves the purpose of automatic screening. The vibration does not need to pass through the multi-layer mesh plate, and it can directly vibrate, making the vibration It can be adjusted precisely without repeated trials, and the effect rate is higher, and the pass rate is also higher. It is no longer repeated screening. At present, some screening nets are lengthened or increased. This method improves the quality of finished products. The efficiency is low, the effect is not good, and the problem is not solved from the essence;

4. The meshes on the sorting plate 21 and the screening plate 22 of the device are all misplaced to ensure that the meshes are interlaced with each other, so as to avoid the smooth passage of capacitor grains without passing through the screening of the meshes, ensuring that each grain Can pass through the screening of the meshes, avoiding the distribution of the meshes into a rectangular array, resulting in a flat channel in the middle, the left and right directions of the meshes on the sorting plate 21 and the screening plate 22 of the device are misaligned, so that when each crystal grain advances Can be blocked and screened by the mesh.

The technical solution in the embodiment of the present invention is to solve the above-mentioned problems, and the general idea is as follows:

In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

When the present invention is being made, conventional frame is made earlier as body 3, base plate is installed at the bottom of body 3, roller 35 and supporting foot 36 are installed at the bottom of body 3, and supporting foot 36 is installed on the bottom of body 3 that can rotate and lift by screw rod, and roller 35 is fixedly installed on the bottom of the body 3, so that when the supporting legs 36 are rotated and extended, the body 3 can be stably supported, and when the supporting legs 36 are retracted, the rollers 35 support and facilitate movement;

Also will install controller in the body 3, just conventional switch or PLC controller, all equipment on the body 3 is controlled, in the frame of body 3 need to install dust collection bucket 32 and vacuum cleaner 37, dust collection bucket 32 The air outlet of the vacuum cleaner 37 is connected with the suction port of the vacuum cleaner 37, and the vacuum cleaner 37 forms a suction force on the dust collection bucket 32. When the demand for dust suction is not large, the vacuum cleaner 37 can be replaced by a conventional negative pressure fan, and the top of the body 3 To set up the workbench 31, it is necessary to ensure that the workbench 31 is erected horizontally, and to install sheet metal on the outside of the body 3 for protection and enclosure, and the workbench 31 needs to be open. Box 33 and finished product box 34, recovery box 33 and finished product box 34 are all the collection boxes that the top is open and closed around;

The front and back direction of the device refers to the forward direction of material screening, the feeding side is the money, and the left and right sides refer to the left and right sides of the forward direction of material screening after the material product screening is completed.

Make a conventional feeding mechanism 4, the feeding mechanism 4 has a funnel-shaped feeding hopper 411, the feeding hopper 411 is erected vertically, the top opening is also open at the bottom, the top opening is large, and the bottom opening is small, which is a conventional hopper with a suitable size Feeding can be done, and a feeding tray 41 is placed below the outlet at the bottom of the feeding hopper 411. The feeding tray 41 is provided with a shovel-shaped structure with vertical edges on the front side and left and right sides. The bottom is a flat plate and the rear side is open, forming like this structure, the feed vibrator 46 should be installed at the bottom of the feed tray 41, and a direct vibrator can be selected. The conveying method of the direct vibration is a conventional technical means driven by vibration, and the rear side edge of the feed tray 41 has no vertical enclosure, so The rear side edge of the feeding tray 41 is exactly the flat plate of the opening. On the rear side edge of the feeding tray 41, a bulk material chute 42 is continued. The bulk material chute 42 is a corrugated plate-shaped structure. Undulating grooves, and each groove is parallel to each other, and each groove is smooth in the front and rear directions, and the left and right directions are arched and isolated in a wavy shape. It has the same structure as the corrugated board, except that the grooves are all concave semicircles;

The rear end of the bulk chute 42 is a dust collection plate 43 and a flow distribution trough 44 arranged obliquely. The dust collection plate 43 and the flow distribution trough 44 are closely connected successively from front to back, and the dust collection plate 43 and the flow distribution chute 44 They are all inclined flat plates with a high front and a low rear, and vertical baffles are set on the left and right sides of the dust suction plate 43 and the splitter trough plate 44, so as to prevent the capacitor grain materials that need to be screened from being scattered to the left and right sides during the forward process. Diverter trough 44 has the same shape as bulk material trough 42, and is an arc-shaped corrugated board structure. The arc channel is also arranged front and back. Bulk material trough 42 and diverter trough 44 are the same in material and shape, only in size and installation angle. Not different, the direction, number and depth of the grooves are the same;

Dust suction plate 43 has two pieces, and a piece of dust suction plate 43 is inclined to be connected below bulk material chute 42 rear sides, and another piece of dust suction plate 43 is forward, and is vertically connected to bulk material chute 42 rear sides and the suction suction of inclination. Between the dust boards 43, it plays the role of filling the gap, and the dust suction board 43 on the inclined rear side needs to form a step shape with the bulk material chute 42, with a height difference, so that the material is vibrated and dropped from the bulk material chute 42 During cutting, the surface of the material can be cut to scatter the attached anti-skid and static electricity removal powder, and the bottom of the dust collection plate 43 is connected with the air inlet of the dust collection bucket 32, so that the negative pressure of the dust collection bucket 32 can directly act on the dust collection plate 43 Above, the dust-absorbing plate 43 is a mesh plate, and the mesh is smaller than the capacitive material grain of standard size, which is convenient to suck away the smaller capacitive grain, but the main purpose is to mix the previous process with the capacitive grain The powder is absorbed, the powder particles are very small and can be easily absorbed, and an air knife 46 and a beam cover 47 need to be installed above the dust suction plate 43 and the splitter trough plate 44, and the air knife 46 is facing the dust suction plate 43 and The splitter trough plate 44 is used to blow up the dust and the powder attached to the grains of the material, and the air bundle hood 47 is a cover for restricting the flow of the wind, and the wind bundle hood 47 is located at the air knife 46 The front side is directly facing the position where the dust suction plate 43 and the splitter trough plate 44 are blocked and rebounds upwards, so that the air bundle cover 47 can completely cover the wind blown by the entire air knife 46, and the air knife 46 is facing forward and downward Air is blown at an angle, so that the wind direction is exactly opposite to the forward direction of the material, thereby producing a more dust-removing effect, and a roller shutter is added to the outside of the wind beam cover 47 to block and isolate the dust, so that all the dust is blocked on the front side of the distribution channel plate 44, And the crystal grains that pass through the splitter trough plate 44 have all been blown away, and the dust that is blown away and separated is sucked away by two dust suction plates 43 and the wind beam cover 47, and the wind beam cover 47 is also communicated with the dust collection bucket 32 Yes, it is possible to bring negative pressure to the wind hood 47 through the dust bucket 32 to suck the dust.

The rear side of the diverter trough plate 44 is connected to a flat receiving plate 23, which is used to protect the vibration equipment at the bottom and play a role in transmitting vibration. The receiving plate 23 is erected at the front end of the screening mechanism 2, and the screening mechanism 2 is stabilized by the frame. The frame of the screening mechanism 2 is erected directly above the workbench 31, and a receiving plate 23, two sorting plates 21, a screening plate 22 and an outlet plate 24 are successively erected on the frame of the screening mechanism 2. The boards are spliced in sequence to form a continuous and seamless complete flat surface, which can be set to be horizontal, or a slope that slopes downward on the rear side, but the slope should not exceed an angle of 5° at most, and try to keep the top surface of the screening mechanism 2 flat and rear. Slightly lower inclined surface, while the sorting plate 21 and the sheet screening plate 22 are all stencils, and the aperture of the stencil is consistent with the purpose of the conventional screen. Eliminate, so the hole size of the sorting plate 21 is slightly smaller than the standard size, and the standard has requirements for use, such as the limited length of the material size is 2mm, and it cannot be used when it is 0.05m smaller than 2mm, then 1.95mm is determined as an unqualified size. The mesh size is specifically set according to the size of the actual delivered product, which belongs to the category of product requirements. The meshes of the sorting plate 21 and screening plate 22 of this device can be set according to the actual product requirements. The size of the sorting plate 21 The function is to remove unqualified products of smaller size, and increase the measuring block sorting plate 21 to ensure thorough removal, and the screening plate 22 is to collect the materials that are qualified in size but not exceeding the standard, and the hole standard must meet the requirements of use Material; what needs to be improved is the arrangement of the meshes on the sorting plate 21 and the screening plate 22, the meshes need to be dislocated in the front and rear directions, so as to avoid the meshes from being arranged in a straight line along the front and rear directions, as shown in Figure 7, the meshes in the front and rear directions are staggered Block each other to prevent material grains from traveling directly along the gap, and each grain will encounter a mesh immediately after passing through a gap to ensure that each grain will be screened by the mesh; the sorting plate 21 and screening Each row of mesh holes on the plate 22 is distributed in a straight line along the left and right directions, and each row of mesh holes is parallel to each other, and the mesh holes in the front and rear directions are not arranged in a straight line;

Also two separation strips 25 will be installed at two sorting plates 21, the top, two separation strips 25 are arranged parallel to each other, and are arranged along the front and back directions, and two separation strips 25 are long strips, and the thickness is no more than 1cm. The length needs to cover the front and rear sides of the two sorting plates 21, and the two separating bars 25 form three isolated passages for the material to advance on the top of the sorting plate 21, so as to avoid the materials from gathering together due to vibration. The materials are always vibrated, moved and screened within the fixed limit range, and the recovery box 33 is placed under the back side of the outlet plate 24, and the crystal grains exceeding the mesh size of the screening plate 22 are grains whose size exceeds the range, and they need to be removed Reject, and carry out post-collection processing by recovery box 33;

Below the screening plate 22, feed channel 26 is set, and as shown in Figure 11, feed channel 26 is the groove of inclination, and feed channel 26 bottoms flat inclined plate, and the front end and left and right sides of feed channel 26 are all closed in The bottom of the screening plate 22 prevents the material from being scattered, and the rear end of the material guide trough 26 is arranged directly above the finished product box 34 to facilitate the collection of materials. At the top of the cavity, the connection is tighter;

The bottom of the sorting plate 21 and the screening plate 22 of this device are equipped with vibrators to provide the drive for the material to move forward, and they are all controlled by the controller in the organism 3, and the vibration frequency and amplitude can be adjusted. The receiving plate 23, two sorting plates 21, one screening plate 22 and one outlet plate 24 close the top of the screening mechanism 2, the sides of the screening mechanism 2 are also closed by sheet metal, and the cavity at the bottom is open and communicated with the dust collection bucket 32. Make the negative pressure of the dust collecting barrel 32 act on the bottom of the sorting plate 21 and the screening plate 22, so that the sorting plate 21 and the screening plate 22 have a small negative pressure suction, and the negative pressure suction should not be too large, so as to avoid the material being The meshes of the sorting plate 21 and the screening plate 22 absorb the situation that they cannot jump up, so the suction at the bottom of the sorting plate 21 and the screening plate 22 needs to be open, and only a slight negative pressure is required. Inhale air in 3 to form a negative pressure in the whole body 3, and the screening mechanism 2 is also a relatively closed space, and extend the negative pressure pipe of the dust collection bucket 32 into the space in the screening mechanism 2 to form a stable slight negative pressure .

Finally, the height-limiting mechanism 1 will be made. The height-limiting mechanism 1 of this device is suspended above the screening plate 22 by self-tightening; Each corner of the plate 17 can be adjusted independently, so that the height distance between each corner of the entire height limiting plate 17 and the screening plate 22 can be adjusted, thereby adjusting the placement angle and height of the height limiting plate 17 .

The specific structure of the height limiting mechanism 1 includes: two micrometer screws 11, two fixed frames 12, two balance pieces 13, two pre-tightening guide rods 14, a cross frame 15, a plurality of locking holes 16 and a limiter. high plate 17;

Wherein, each fixed frame 12 bottoms have all offered a plurality of locking holes 16, and fixed frame 12 is locked on the left and right sides of the frame of screening mechanism 2 by the bolt of locking hole 16, and ensure that fixed frame 12 and screening plate as far as possible 22. The top plane is vertical, and a horizontal frame 15 is arranged horizontally between the tops of the two fixed frames 12. The horizontal frame 15 needs to be parallel to the screening plate 22 as far as possible, because the error always exists, so the structure of the device needs to be fine-tuned;

The vertical inner side walls of the two fixed mounts 12 are all fixedly provided with guide grooves 121, and there are two balance pieces 13, and a slide block 132 is set on the outside vertical side walls of each balance piece 13, and the slide block 132 can slide vertically. It is located in the guide groove 121, and the slider 132 and the guide groove 121 are in a transitional fit to ensure stable sliding, and the guide groove 121 and the slider 132 are a dovetail groove matching structure, which ensures tight and stable connection, and can also slide up and down, while balancing A micrometer screw 11 is also arranged on the top of the piece 13, and the adjustment handle of the micrometer screw 11 is arranged on the top of the cross frame 15 for easy adjustment;

The top of the balance piece 13 is suspended on the horizontal frame 15 by the micrometer screw 11, and the fine adjustment in the up and down direction can be carried out by the micrometer screw 11, and the balance piece 13 is also slid and limited by the slide block 132; the top of the balance piece 13 Preload guide rod 14 will also be set, and preload guide rod 14 is vertically fixed on the top of balancer 13, and the upper end of preload guide rod 14 passes through cross frame 15 to hang, and preload guide rod 14 top and cross frame Springs are also provided between 15, and the springs are used to elastically pre-tighten the pre-tightening guide rod 14 to avoid loosening due to other reasons, and the pre-tightening guide rod 14 can ensure that the lifting and hanging of the balancer 13 are more stable, It can also make the balance piece 13 vertically lift, so that the structure can make the whole balance piece 13 vertically lift under the double restriction of the fixed frame 12 and the cross frame 15, and two adjustment rods 131 are also arranged at the bottom of each balance piece 13 , each adjusting rod 131 is a screw rod, so the two balance pieces 13 have four adjusting rods 131, and the four adjusting rods 131 are symmetrically distributed on the four corners of the height limiting plate 17, the purpose is to adjust the height of the height limiting plate 17 When it can be balanced, the balance piece 13 is connected with the height limit plate 17 through four adjustment rods 131; To lower the height of the height limiting plate 17, you only need to lock the adjustment rod 131 each time, and the precision gap can limit the height of the adjustment rod 131, so that you can install precision gaps of different thicknesses to adjust during the test machine The distance between each corner of the height-limiting plate 17 and the screening plate 22 is adjusted accurately, thereby limiting the jumping height of the capacitor grain material subjected to vibration;

The entire height limiting mechanism 1 is hung on the frame of the screening mechanism 2, and does not receive vibration directly, while the vibration amplitude of the entire screening plate 22 is inherently small, and the fixed frame 12 is stably erected on the body through the screening mechanism 2 3 on the workbench 31, then through the guidance of the pre-tightening guide rod 14 and the upper spring and the cross frame 15 are always locked to avoid loosening of the bolts, and can always maintain the balance lifting and position fixing of the balance member 13; and The entire balance member 13 can be adjusted up and down through the micrometer screw 11, so that the balance bar 13 can be lifted and lowered along the guide groove 121 and the pre-tightened guide bar 14. The dual-guided lift can ensure that the entire balance bar 13 is hoisted stably, and avoids the balance bar 13. There is only one point of hoisting, which effectively prevents the height-limiting plate 17 from shaking in the front, rear, left, and right directions, and ensures that the height-limiting plate 17 is hoisted stably.

When the present invention is in use, the height of the height-limiting plate 17 is first adjusted, and the hoisting height of the entire balance piece 13 is adjusted through the micrometer screw 11. The slider 132 of the balance piece 13 slides up and down in the guide groove 121, and the gap is small. There are also restrictions on the left-right and front-to-back directions of the pre-tightening guide rod 14, so that the balance member 13 cannot shake, and the pre-tightening guide rod 14 and the cross frame 15 are transitionally fitted, which can guide more accurately, and a spring is added to keep it always Pre-warning of force to ensure that the micrometer screw 11 and the cross frame 15 are always thread pre-tightened, thereby improving the adjustment and locking accuracy;

Adjust the specific height of the whole balance piece 13, ensure that the height interval between the height-limiting plate 17 and the screening plate 22 is greater than the thickness of the capacitor grain material, and the height interval between the height-limiting plate 17 and the screening plate 22 is less than the vertical height of the material, ensuring No matter how the capacitor grain material vibrates, there is no upright space. After roughly adjusting the appropriate height, measure by a compact micrometer. It is necessary to measure each side and corner of the height-limiting board 17. If the height-limiting board 17 and If the spacing between the screening plates 22 is too small, then the height of the entire balance piece 13 needs to be adjusted through the micrometer screw 11. If the spacing between the height limiting plate 17 and the screening plate 22 is slightly larger, it can be adjusted within the adjustment range of the precision gap. Adjust the micrometer screw 11 again, if a certain side or angle height position is not suitable, just increase or decrease the precision gap piece, the precision gap piece is locked between the adjustment rod 131 and the height limit plate 17, to ensure that the screening plate 22 Keep the same distance from each side and corner of the height-limiting plate 17, and the precision can reach 0.001mm. The precision gap sheet is a product required by the mold industry, and the thickness range is 0.001-3.00mm. There are more than 50 kinds, also known as Die gaskets or precision gaskets can be achieved by this device as long as the accuracy range of the precision gap sheet can be achieved.

After the adjustment is completed, it is necessary to install and debug. Adjust the vibration frequency and amplitude of the vibrator at the bottom of the sorting plate 21 and screening plate 22, as well as the feeding vibrator 45, so that the single speed and the jumping height of the material are appropriate. The size and weight of the crystal grains require different vibration amplitudes and frequencies, which need to be set on site according to the size of the product grains, all of which are adjusted through the controller in the body 3, which is a routine installation for those skilled in the art debug operations;

After the commissioning is completed, the screening can be started, and the capacitor grain material to be screened is put into the feed hopper 411, and the material continuously falls down into the feed tray 41 along the feed hopper 411, and the feed vibrator 45 vibrates the material on the feed tray 41 Propel, the capacitor grain material advances backwards, and first falls on the bulk material trough 42, the corrugated bulk material trough 42 disperses the material, as long as the accumulation is close to the position of the top notch of the arc groove of the bulk material trough 42 All will be vibrated into the adjacent grooves, so that the material is evenly distributed in the bulk material chute 42, and the material will continue to advance and fall on the inclined dust suction plate 43 at the rear side. The bottom of the dust suction plate 43 is directly The suction port of the dust collection bucket 32 is docked, and the negative pressure sucks the material to clean the dust. At this time, the air knife 46 blows the falling process and the grain material that has fallen on the dust suction plate 43, and the The dust is blown and separated from the material. The air blowing direction of the air knife 46 is from the upper side to the lower side, so that the material and the air knife 46 form a hedge. The material is enough, and then the dust blown by the air knife 46 is sucked away by the vertical dust-absorbing plate 43 and the wind hood 47, so as to achieve the effect of cleaning the material;

After the material is blown clean, it continues to advance, and travels along the inclined dust collection plate 43 to the inclined distribution channel plate 44. It has the same structure as the bulk material channel plate 42. It is a corrugated plate structure with arc grooves in the front and rear directions. , continue to disperse the materials so that the materials do not accumulate in the same place;

The material continues to move forward under the vibration of the feeding vibrator 45, and the vibration amplitude of the feeding mechanism 4 is slightly larger, which is convenient for blowing dust;

The material on the splitter trough plate 44 will advance to the receiving plate 23 of the screening mechanism 2 when it is vibrated. The receiving plate 23 is vibrated, and the material continues to advance to the sorting plate 21. The material vibrates and jumps on the sorting plate 21, and there is no limit to the jumping height of the material, so that all materials smaller than the standard size are screened out as much as possible, and the bottom of the sorting plate 21 also has negative pressure suction, as long as the crystal grains enter the net The material that cannot enter the mesh will be continuously bounced by the vibration, and the material will be isolated by the partition bar 25, so as to avoid the accumulation and concentration of the pre-dispersed material due to vibration;

As long as the material not smaller than the standard size enters the screening plate 22, the height limit plate 17 on the screening plate 22 will limit the jumping height of the material to ensure that the material can only lie flat and jump, and will not stand upright;

For example, when the grain size is 1mm thick, 2mm long, and 1mm wide, the size of the grain is a rectangle with a length of 2mm and a width of 1mm when lying flat. Therefore, only the size of the rectangle is the same as the mesh size and can enter the mesh and be screened and dropped. No size can fall, and the gap between the height-limiting plate 17 and the screening plate 22 will not exceed 2mm, so the grains superimposed up and down cannot enter the screening plate 22 and can be blocked outside. There are fewer such grains. And the crystal grain that length and width exceed the limit also can't pass through the mesh of screening plate 22, can only continue to advance on screening plate 22, pass screening plate 22 and fall in recovery box 33, and by the mesh of screening plate 22 The intercepted and fallen grain material will fall into the material guide groove 26 through the suction of negative pressure, and finally fall into the finished product box 34 along the bottom slope of the material guide groove 26;

The entire screening process of this device has only one layer, and the structure is simple, and instead of increasing the yield rate through multiple screenings, it is screened by eliminating specifications that do not meet the requirements. However, the current manual screen screening has no way to limit the height, nor can it The restrictions are so precise that many materials with the same vertical cross-section will enter the finished product box 34. Even if there are many screening times, unqualified products will still be mixed in due to the difference in essential screening conditions. Multiple screenings can only ensure that they meet the requirements. Conditional materials are screened, and the screening conditions include the conditions of unqualified products, which will lead to the fact that the materials cannot be effectively removed no matter how they are screened, and the current height restriction mechanism for such materials can hardly do such accurate screening. Therefore, the qualified rate can only be improved through multiple screenings, and this device adjusts the gap between the height-limiting plate 17 and the screening plate 22 through micro-distance, and rejects unqualified products from the condition, and this height-limiting plate 17 is under vibration conditions. It is difficult to remove materials with small thickness differences.

In addition, in the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "Outside", "front", "rear", "top", "bottom", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description , rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

Linear vibrating screen, linear vibrating screen uses vibrating motor excitation as the source of vibration power, so that the material is thrown up on the screen and moves forward in a straight line at the same time. The sieve produces several specifications of oversize and undersize, which are discharged from their respective outlets. It has low energy consumption, high output, simple structure, easy maintenance, fully enclosed structure, no dust spillage, automatic discharge, and is more suitable for assembly line operations. At present, adaptive adjustments have been made in many industries, such as the chip industry, which requires stable transportation. Small particle chips that can bounce up slightly need to be adjusted, such as reducing the vibration height of the material, reducing the vibration amplitude of the material, and increasing the vibration frequency of the material. These can be adjusted by improving the structure of the vibrator. Now it has been obtained fully

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (5)

1. A vibratory screening machine, comprising: the height limiting mechanism (1), the screening mechanism (2), the machine body (3), the feeding mechanism (4) and the controller (5);

the machine body (3) is a stably supported frame, and a horizontal workbench (31) is stably erected at the top of the machine body (3); the controller (5) is arranged inside the machine body (3);

the feeding mechanism (4) comprises feeding trays (41) and feeding vibrators (45), the feeding trays (41) are stably erected at the top of the workbench (31), and the feeding vibrators (45) are attached to the bottoms of the feeding trays (41);

the screening mechanism (2) is stably mounted on the workbench (31), the screening mechanism (2) comprises a sorting plate (21) and a screening plate (22), the sorting plate (21) and the screening plate (22) are screen plates, the sorting plate (21) is connected to the rear side of the feeding disc (41), the screening plate (22) is connected to the rear of the sorting plate (21), vibrators are arranged at the bottoms of the sorting plate (21) and the screening plate (22), and the sorting plate (21) and the screening plate (22) are on the same continuous plane;

the height limiting mechanism (1) comprises a fixed frame (12), a balance piece (13), a cross frame (15) and a height limiting plate (17), the fixed frame (12) is stably erected on the screening mechanism (2), the cross frame (15) stably stretches across right above the screening plate (22) left and right through the fixed frame (12), the balance piece (13) can be locked in a hanging mode and hung on the cross frame (15) in an up-and-down adjusting mode, the height of the height limiting plate (17) can be independently adjusted in all directions and hung on the balance piece (13), and the height limiting plate (17) is not in contact with the right above the screening plate (22);

the feeding vibrator (45) and the vibrators in the screening mechanism (2) are connected with the controller (5).

2. A vibratory screening machine as set forth in claim 1 wherein: a recovery box (33) and a finished product box (34) are arranged at the top of the workbench (31), and the recovery box (33) and the finished product box (34) are collecting boxes with top openings;

a dust collection barrel (32) is further arranged in the machine body (3), an air outlet of the dust collection barrel (32) is connected with a dust collector (37), an air suction port of the dust collection barrel (32) extends out of the upper part of the workbench (31), and a bag-shaped air filter is arranged in the dust collection barrel (32);

the bottom of the machine body (3) is further provided with a plurality of rollers (45) and a plurality of supporting legs (36), the supporting legs (36) are distributed at the bottom of the machine body (3) in a rectangular mode, the supporting legs (36) can be installed at the bottom of the machine body (3) in a telescopic mode through screws, and the rollers (35) are universal wheels.

3. A vibratory screening machine as set forth in claim 2 wherein: the feeding mechanism (4) further comprises a feeding hopper (411), the feeding hopper (411) is of a funnel-shaped structure with a large upper part and a small lower part, the top of the feeding hopper is provided with an opening, the feeding tray (41) is connected to the position right below an outlet at the bottom of the feeding hopper (411), the bottom of the feeding tray (41) is provided with a feeding vibrator (41), the rear end of the feeding tray (41) is connected with a bulk material groove plate (42), the rear end of the bulk material groove plate (42) is provided with a dust suction plate (43), the rear side of the dust suction plate (43) is connected with a flow distribution groove plate (44), an air knife (46) and a beam hood (47) are erected above the dust suction plate (43), the blowing direction of the air knife (46) is right opposite to the dust suction plate (43), the air knife (46) is connected with an air blower in the machine body (3), and the dust suction plate (43) is hermetically connected with an air suction port and the beam hood (47) of the dust collection barrel (32);

the bulk material groove plate (42) and the flow dividing groove plate (44) are corrugated plates with arc-shaped groove cross sections, and the corrugated grooves of the bulk material groove plate (42) and the flow dividing groove plate (44) are smooth in the front-back direction;

the dust collecting plate is characterized in that the number of the dust collecting plates (43) is two, one dust collecting plate (43) is arranged in a downward inclined mode in the rear side direction, the other dust collecting plate (43) is vertically connected to the rear side edge of the bulk material groove plate (42), the bulk material groove plate (42) is connected with the two dust collecting plates (43) in a step shape, and the dust collecting plates (43) are screen plates.

4. A vibratory screening machine as set forth in claim 3 wherein: the screening mechanism (2) further comprises a bearing plate (23), a guide-out plate (24), separating strips (25) and a guide chute (26), wherein the bearing plate (23) and the guide-out plate (24) are smooth flat plates, the bearing plate (23) is seamlessly connected between a flow dividing chute plate (44) and the sorting plate (21), the sorting plate (21) is provided with two pieces, the two sorting plates (21) are mutually connected in the front-back direction, and the two sorting plates (21) have different vibration frequencies;

the number of the separating strips (25) is at least two, the two separating strips (25) are mutually parallel and fixedly arranged at the top of the sorting plate (21), and the sorting plate (21) is divided into three advancing channels through the two separating strips (25);

the screening plate (22) is seamlessly received by the guide-out plate (24), the recovery box (33) is received by the rear end edge of the guide-out plate (24), a material guide groove (26) is further arranged below the screening plate (22), the material guide groove (26) is a groove with openings at the rear side and the top, the front side and the left side of the material guide groove (26) are sealed at the bottom of the screening plate (22), the rear side of the material guide groove (26) inclines downwards, the screening plate (22) is located in the receiving range of the material guide groove (26), and the opening at the top of the finished product box (34) is received by the opening at the rear end of the material guide groove (26);

the bottom parts of the sorting plate (21) and the screening plate (22) are also connected with an air suction port of the dust collection barrel (32);

the meshes on the sorting plate (21) and the screening plate (22) are uniformly distributed into a plurality of rows, and the front and back directions of the meshes in each row are not on the same straight line any more.

5. A vibratory screening machine as set forth in claim 1 wherein: the height limiting mechanism (1) further comprises a micrometer screw (11), a guide groove (121), a balance piece (13), an adjusting rod (131), a sliding block (132), a pre-tightening guide rod (14), a cross frame (15) and a locking hole (16);

the screening device is characterized in that the number of the fixing frames (12) is two, a plurality of locking holes (16) are horizontally formed in the bottoms of the two fixing frames (12), the two fixing frames (12) are locked and installed on the left side and the right side of the screening plate (22) through bolts and the locking holes (16), a cross frame (15) is erected between the two fixing frames (12), the cross frame (15) stretches across the left side and the right side of the screening plate (22), and a guide groove (121) is formed in the vertical inner side wall, facing the screening plate (22), of each fixing frame (12);

the two balance pieces (13) are square blocks, the top of each balance piece (13) is connected with a micrometer screw (11) and a pre-tightening guide rod (14), the two balance pieces (13) are respectively hung on the left side and the right side of a cross frame (15) through the micrometer screws (11), the pre-tightening guide rods (14) are vertically and slidably arranged on the cross frame (15), the pre-tightening guide rods (14) and the cross frame (15) are pre-tightened through springs, a sliding block (132) is arranged on a vertical side wall of each balance piece (13), the sliding block (132) is vertically and slidably arranged in a guide groove (121), at least two adjusting rods (131) are vertically arranged at the bottom of each balance piece (13), each height limiting plate (17) is a square flat plate, a screening plate (22) is located in the coverage range of each height limiting plate (17), four corners of each height limiting plate (17) are hung on four adjusting rods (131) through threads, the four adjusting rods (131) are distributed in a rectangular shape, and the four adjusting rods (131) are symmetrical relative to the center line of each vertical height limiting plate (17).

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