WO2025043882A1 - Sorting and screening device for harmless disposal of waste - Google Patents

Abstract

The present invention relates to the technical field of disposal of waste. Disclosed is a sorting and screening device for harmless disposal of waste, comprising a box body, a feed port being formed in the top of the box body; a transmission mechanism is provided on the right side of the box body; a separation mechanism is provided on the rear portion of the box body; a discharge port is formed in the left side of the box body; a first roller, a second roller, a flattening roller, a first crushing roller and a second crushing roller are all provided on an inner wall of the box body; the surface of the first roller is in driving connection with the surface of the second roller by means of a conveyor belt; two fans are provided on the inner right wall of the box body; a screen plate is provided on the inner wall of the box body. The present invention can automatically sort waste by means of the transmission mechanism, so as to reduce the labor intensity of workers and improve working efficiency, and simultaneously sorts multiple types of waste by means of the transmission mechanism and the separation mechanism without the need for sorting treatment in multiple procedures, reducing investment costs.

Description

A classification and screening device for harmless treatment of garbage Technical Field

The invention relates to the technical field of garbage disposal, in particular to a classification and screening device for harmless disposal of garbage.

Background Art

Garbage is solid waste generated in human daily life and production. Due to its large discharge volume, complex and diverse composition, and its pollution, resource and social nature, it needs to be harmlessly, resourcefully, reduced and socially treated. If it is not properly handled, it will pollute the environment, affect environmental hygiene, waste resources, damage production and living safety, and destroy social harmony. Garbage disposal is to quickly remove the garbage and treat it harmlessly.

At present, in garbage treatment plants, most of them still rely on workers to manually sort garbage, resulting in low work efficiency and high labor input. Some existing sorting equipment can only perform a single classification. When further classification is required, it needs to be moved to the next process for classification, which is very troublesome and has a high investment cost. Therefore, a classification and screening device for harmless treatment of garbage is proposed to solve the above-mentioned problems.

Technical issues

In view of the deficiencies in the prior art, the present invention provides a classification and screening device for harmless treatment of garbage, which solves the problems of low efficiency of manual classification, relatively simple machine classification, and the need for multiple classifications.

Technical Solutions

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a classification and screening device for harmless treatment of garbage, comprising a box body, a feeding port is arranged on the top of the box body, a transmission mechanism is arranged on the right side of the box body, a separation mechanism is arranged on the rear of the box body, a discharging port is arranged on the left side of the box body, a No. 1 roller, a No. 2 roller, a smoothing roller, a No. 1 crushing roller and a No. 2 crushing roller are arranged on the inner wall of the box body, respectively, and the No. 1 crushing roller and the No. 2 crushing roller are located above the No. 1 roller and the No. 2 roller, the smoothing roller is located between the No. 2 roller and the No. 1 crushing roller, the surface of the No. 1 roller is connected to the surface of the No. 2 roller through a conveyor belt, two fans are arranged on the right wall inside the box body, and a screen plate is arranged on the inner wall of the box body, and the screen plate is located above the No. 2 crushing roller;

The transmission mechanism includes a first pulley, the surface of the first pulley is connected to the surface of the double-layer pulley through a belt, the surface of the double-layer pulley is connected to the surface of the first small pulley through a belt, a second pulley is arranged at the axis of the first small pulley, the surface of the second pulley is connected to the surface of the third pulley through a belt, a second small pulley is arranged at the axis of the third pulley, the surface of the second small pulley is connected to the surface of the fourth pulley through a belt, a picking device is arranged on the left side of the box body, and a motor is arranged on the right side of the box body.

Preferably, the selecting device includes a No. 1 gear, a No. 2 gear is arranged on the surface of the No. 1 gear, a No. 1 sprocket is arranged at the axis of the No. 2 gear, the surface of the No. 1 sprocket is connected to the surface of the No. 2 sprocket through a chain, a turntable is arranged at the axis of the No. 2 sprocket, and a transmission rod is arranged on the left side of the turntable.

Preferably, the axes of the No. 1 gear and the No. 2 gear are respectively welded and fixed to the axes of the No. 1 crushing roller and the No. 2 crushing roller through connecting rods, the surface of the No. 2 gear is meshed with the surface of the No. 1 gear, the axis of the No. 1 sprocket is welded and fixed to the axis of the No. 2 gear, the axis of the turntable is welded and fixed to the axis of the No. 2 sprocket, the inner wall of the transmission rod is rotationally connected to the left side of the turntable through the connecting rod, the axis of the No. 2 sprocket is rotationally connected to the left side of the box through the connecting rod, and the inner wall of the transmission rod is rotationally connected to the left side of the screen plate through the connecting rod.

Preferably, the separation mechanism includes a mounting plate, an inner wall of the mounting plate is provided with a clamping strip, a moving block is provided at the rear of the clamping strip, an electromagnet is provided at the bottom of the moving block, and an electric push rod is provided at the rear of the mounting plate.

Preferably, the surface of the clamping strip is slidably connected to the inner wall of the mounting plate, the front of the moving block is welded and fixed to the rear of the clamping strip, the top of the electromagnet is fixedly mounted on the bottom of the moving block, the surface of the electric push rod is connected to the rear of the mounting plate by bolts, the front of the mounting plate is connected to the rear of the box by bolts, the front of the moving block is slidably connected to the rear of the mounting plate, and the output end of the electric push rod is fixedly connected to the right side of the moving block.

Preferably, the left end of the motor is connected to the right side of the box body by bolts, the axis of the No. 2 pulley is welded and fixed to the axis of the No. 1 small pulley, and the axis of the No. 2 small pulley is welded and fixed to the axis of the No. 3 pulley.

Preferably, the feed port is opened on the top of the box, the discharge port is opened on the left side of the box, both ends of the No. 1 roller, No. 2 roller, smoothing roller, No. 1 crushing roller and No. 2 crushing roller are rotatably connected to the inner wall of the box, the axis of the fan is rotatably connected to the right wall inside the box, and the surface of the screen plate is slidably connected to the inner wall of the box.

Preferably, the output end of the motor is welded and fixed to the axis of the No. 1 roller, the axis of the No. 1 pulley is welded and fixed to the axis of the No. 2 roller through a connecting rod, the axis of the double-layer pulley is welded and fixed to the axis of the smoothing roller through a connecting rod, the axes of the No. 2 pulley and the No. 3 pulley are both welded and fixed to the axes of the two fans through a connecting rod, and the axis of the No. 4 pulley is welded and fixed to the axis of the No. 2 crushing roller through a connecting rod.

Beneficial Effects

Compared with the prior art, the present invention provides a classification and screening device for harmless treatment of garbage, which has the following beneficial effects:

1. The classification and screening device for harmless treatment of garbage can automatically classify and treat garbage through a transmission mechanism, thereby reducing the labor intensity of workers and significantly improving work efficiency.

2. The classification and screening device for harmless treatment of garbage can classify multiple types of garbage at the same time through a transmission mechanism and a separation mechanism, thereby eliminating the need for multiple processes for classification and treatment, and reducing cost investment.

3. The classification and screening device for harmless treatment of garbage can crush the screened garbage through the No. 1 drum and the No. 2 drum, so that the fan can blow out the broken plastics and the electromagnet can absorb the broken metals, which can increase the efficiency of classification.

4. The classification and screening device for harmless treatment of garbage can flatten the garbage falling on the conveyor belt through the smoothing roller, thereby preventing the garbage from piling up, which will make it impossible to absorb the metal later, thus limiting the scope of application of the device.

5. The classification and screening device for harmless treatment of garbage can simultaneously drive the screening, crushing, blowing, leveling, transportation and absorption of metal in garbage by one motor, thereby reducing the number of motors placed, thereby reducing the cost investment, reducing the space occupied, realizing synchronous operation among various mechanisms, and improving work efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a classification and screening device for harmless treatment of garbage proposed by the present invention;

FIG2 is a cross-sectional view of the overall structure of a classification and screening device for harmless treatment of garbage proposed by the present invention;

FIG3 is a schematic diagram of a transmission mechanism of a classification and screening device for harmless treatment of garbage proposed by the present invention;

FIG4 is a schematic diagram of a transmission mechanism of a classification and screening device for harmless treatment of garbage proposed by the present invention;

FIG5 is a schematic diagram of a sorting and screening device for harmless treatment of garbage proposed by the present invention;

FIG6 is a rear view of a sorting and screening device for harmless treatment of garbage proposed by the present invention;

FIG. 7 is a schematic diagram of a separation mechanism of a classification and screening device for harmless treatment of garbage proposed by the present invention.

In the figure: 1. Box body; 2. Feed inlet; 3. Transmission mechanism; 31. Pulley No. 1; 32. Double-layer pulley; 33. Small pulley No. 1; 34. Pulley No. 2; 35. Pulley No. 3; 36. Small pulley No. 2; 37. Pulley No. 4; 38. Picking device; 381. Gear No. 1; 382. Gear No. 2; 383. Sprocket No. 1; 384. Sprocket No. 2; 385. Turntable; 386. Transmission rod; 39. Motor; 4. Separation mechanism; 41. Mounting plate; 42. Card bar; 43. Moving block; 44. Electric push rod; 45. Electromagnet; 5. Discharge port; 6. Roller No. 1; 7. Roller No. 2; 8. Smoothing roller; 9. Fan; 10. Crushing roller No. 1; 11. Crushing roller No. 2; 12. Screen plate.

Best Mode for Carrying Out the Invention

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example 1

A classification and screening device for harmless treatment of garbage, as shown in Figures 1 to 7, includes a box body 1, a feeding port 2 is arranged on the top of the box body 1, a transmission mechanism 3 is arranged on the right side of the box body 1, a separation mechanism 4 is arranged on the rear of the box body 1, a discharge port 5 is arranged on the left side of the box body 1, and a No. 1 roller 6, a No. 2 roller 7, a smoothing roller 8, a No. 1 crushing roller 10 and a No. 2 crushing roller 11 are respectively arranged on the inner wall of the box body 1, and the No. 1 crushing roller 10 and the No. 2 crushing roller 11 are located above the No. 1 roller 6 and the No. 2 roller 7, the smoothing roller 8 is located between the No. 2 roller 7 and the No. 1 crushing roller 10, the surface of the No. 1 roller 6 is connected to the surface of the No. 2 roller 7 through a conveyor belt, two fans 9 are arranged on the right wall inside the box body 1, and a screen plate 12 is arranged on the inner wall of the box body 1, and the screen plate 12 is located above the No. 2 crushing roller 11;

The transmission mechanism 3 includes a first pulley 31, the surface of the first pulley 31 is connected to the surface of a double-layer pulley 32 by a belt, the surface of the double-layer pulley 32 is connected to the surface of a first small pulley 33 by a belt, a second pulley 34 is arranged at the axis of the first small pulley 33, the surface of the second pulley 34 is connected to the surface of a third pulley 35 by a belt, a second small pulley 36 is arranged at the axis of the third pulley 35, the surface of the second small pulley 36 is connected to the surface of a fourth pulley 37 by a belt, a picking device 38 is arranged on the left side of the box body 1, and a motor 39 is arranged on the right side of the box body 1.

In this embodiment, the selecting device 38 includes a No. 1 gear 381, a No. 2 gear 382 is arranged on the surface of the No. 1 gear 381, a No. 1 sprocket 383 is arranged at the axis of the No. 2 gear 382, the surface of the No. 1 sprocket 383 is connected to the surface of the No. 2 sprocket 384 through a chain, a turntable 385 is arranged at the axis of the No. 2 sprocket 384, and a transmission rod 386 is arranged on the left side of the turntable 385. The selecting device 38 can drive the screen plate 12 to move back and forth, and then the garbage can be preliminarily classified and screened, and the size of the holes on the screen plate 12 can be freely adjusted according to actual needs, which is very convenient and practical.

Furthermore, the axes of the first gear 381 and the second gear 382 are respectively welded and fixed to the axes of the first crushing roller 10 and the second crushing roller 11 through connecting rods, the surface of the second gear 382 is meshed with the surface of the first gear 381, the axis of the first sprocket 383 is welded and fixed to the axis of the second gear 382, the axis of the rotating disk 385 is welded and fixed to the axis of the second sprocket 384, and the inner wall of the transmission rod 386 is connected to the left rotating disk 385 through the connecting rod. The second sprocket 384 is rotatably connected to the left side of the box body 1 through a connecting rod at its axis, and the inner wall of the transmission rod 386 is rotatably connected to the left side of the screen plate 12 through a connecting rod. Through the meshing of the first gear 381 and the second gear 382, the first crushing roller 10 and the second crushing roller 11 can be driven to rotate in opposite directions, so that the garbage can be crushed between the two, thereby turning large pieces of garbage into small pieces of garbage, making it convenient for the subsequent processes to operate, and increasing work efficiency in disguise.

Furthermore, the separation mechanism 4 includes a mounting plate 41, the inner wall of the mounting plate 41 is provided with a clamping strip 42, the rear of the clamping strip 42 is provided with a moving block 43, the bottom of the moving block 43 is provided with an electromagnet 45, and the rear of the mounting plate 41 is provided with an electric push rod 44. The clamping strip 42 can guide and support the movement of the moving block 43 to prevent the moving direction from being offset under the push of the electric push rod 44, and to prevent the electromagnet 45 from absorbing too much metal, resulting in its excessive weight, causing the moving block 43 to fall, thereby causing the device to be unable to continue working and increasing maintenance costs.

In addition, the surface of the clamping strip 42 is slidably connected to the inner wall of the mounting plate 41, the front of the moving block 43 is welded and fixed to the rear of the clamping strip 42, the top of the electromagnet 45 is fixedly installed on the bottom of the moving block 43, the surface of the electric push rod 44 is connected to the rear of the mounting plate 41 by bolts, the front of the mounting plate 41 is connected to the rear of the box body 1 by bolts, the front of the moving block 43 is slidably connected to the rear of the mounting plate 41, and the output end of the electric push rod 44 is fixedly connected to the right side of the moving block 43. After a batch of garbage is sorted, the moving block 43 can be pushed out through the electric push rod 44, and the metal absorbed by the electromagnet 45 under the moving block 43 can be recovered. Then the electric push rod 44 retracts to drive the electromagnet 45 to reset, so that it can continue to absorb metal.

In addition, the left end of the motor 39 is connected to the right side of the box body 1 by bolts, the axis of the No. 2 pulley 34 is welded and fixed to the axis of the No. 1 small pulley 33, and the axis of the No. 2 small pulley 36 is welded and fixed to the axis of the No. 3 pulley 35. One motor 39 can simultaneously drive the screening of garbage, the crushing of garbage, the blowing of garbage, the flattening of garbage, the transportation of garbage, and the absorption of metal in garbage, thereby reducing the number of motors 39 placed, thereby reducing the cost investment, reducing the space occupied, realizing the synchronous operation of various mechanisms, and improving work efficiency.

Example 2

As shown in Figures 1 to 6, the feed port 2 is opened at the top of the box body 1, the discharge port 5 is opened on the left side of the box body 1, and both ends of the No. 1 roller 6, the No. 2 roller 7, the smoothing roller 8, the No. 1 crushing roller 10 and the No. 2 crushing roller 11 are rotatably connected to the inner wall of the box body 1, the axis of the fan 9 is rotatably connected to the right wall inside the box body 1, the surface of the screen plate 12 is slidably connected to the inner wall of the box body 1, and connecting rods are welded on both sides of the screen plate 12, and the connecting rods are placed in the slide grooves opened on the inner wall of the box body 1, so that the screen plate 12 can reciprocate while maintaining an inclined state, thereby preventing the screen plate 12 from rotating itself during movement or failing to maintain an inclined state, resulting in the screened garbage being unable to move to the No. 1 crushing roller 10 and the No. 2 crushing roller 11, causing the device to be unable to continue working, and its practicality is greatly reduced.

It is worth noting that the output end of the motor 39 is welded and fixed to the axis of the No. 1 roller 6, the axis of the No. 1 pulley 31 is welded and fixed to the axis of the No. 2 roller 7 through a connecting rod, the axis of the double-layer pulley 32 is welded and fixed to the axis of the smoothing roller 8 through a connecting rod, the axes of the No. 2 pulley 34 and the No. 3 pulley 35 are welded and fixed to the axes of the two fans 9 through a connecting rod, and the axis of the No. 4 pulley 37 is welded and fixed to the axis of the No. 2 crushing roller 11 through a connecting rod. The reason why this device uses belt drive is that the belt has good elasticity, can alleviate impact and vibration during work, moves smoothly and without noise, and when the load is too large, the belt slips on the wheel, thereby preventing other parts from being damaged and playing a safety protection role. The belt is an intermediate part, and its length can be selected within a certain range according to needs to adapt to working conditions with larger center distance requirements. It has a simple structure and is easy to manufacture, easy to install and maintain, and has low cost, so belt drive is selected.

When the classification and screening device for harmless treatment of garbage of the present invention is used, the garbage is put into the feed port 2, and the garbage will fall on the screen plate 12. The motor 39 drives the No. 1 roller 6 to rotate, the No. 1 roller 6 drives the No. 2 roller 7 to rotate, the No. 2 roller 7 drives the No. 1 pulley 31 to rotate, the No. 1 pulley 31 drives the double-layer pulley 32 to rotate, the double-layer pulley 32 drives the No. 1 small pulley 33 to rotate, the No. 1 small pulley 33 drives the No. 2 pulley 34 to rotate, the No. 2 pulley 34 drives the No. 3 pulley 35 to rotate, the No. 3 pulley 35 drives the No. 2 small pulley 36 to rotate, the No. 2 small pulley 36 drives the No. 4 pulley 37 to rotate, and the No. 4 pulley 37 drives the No. 2 crushing Roller 11 rotates, No. 2 crushing roller 11 drives No. 2 gear 382, No. 2 gear 382 drives No. 1 sprocket 383 to rotate, No. 1 sprocket 383 drives No. 2 sprocket 384 to rotate, No. 2 sprocket 384 drives turntable 385 to rotate, turntable 385 drives screen plate 12 to move back and forth through transmission rod 386, so that screen plate 12 can vibrate, so that it can screen garbage, so that smaller garbage such as small plastics, paper scraps, etc. fall through screen plate 12, and large garbage will move between No. 2 crushing roller 11 and No. 1 crushing roller 10 through the inclined screen plate 12, at this time No. 2 gear 382 drives No. 1 gear 381 to rotate, No. 1 gear 381 drives No. 1 crushing roller 10 The first crushing roller 10 and the second crushing roller 11 rotate in opposite directions to squeeze and crush the garbage. The crushed garbage and the previously screened garbage will fall onto the conveyor belt. During the falling process, the second pulley 34 and the third pulley 35 will drive the two fans 9 to rotate, so that the screened garbage and the crushed garbage are blown out respectively, so that the lighter garbage, such as broken plastics and paper scraps, are blown out from the discharge port 5. The garbage falling on the conveyor belt will be driven by the rotation of the first roller 6 and the second roller 7 to move, and while moving, the double-layer pulley 32 will drive the smoothing roller 8 to rotate, so that it can flatten the accumulated garbage, thereby preventing the garbage from piling up together. , which makes it impossible to absorb the metal subsequently, limiting the application scope of the device. The flattened garbage continues to move, and the electromagnet 45 is energized. At this time, the metal in the garbage will be sucked to the electromagnet 45, and the remaining garbage will be moved out along the conveyor belt. When the garbage is processed, the electric push rod 44 will move through the moving block 43, and the moving block 43 will drive the electromagnet 45 to move, so that the electromagnet 45 moves out of the conveyor belt. At this time, the electromagnet 45 is powered off, so that the metal on the electromagnet 45 can fall and be collected. By automatically sorting and screening the garbage, the labor intensity of the workers can be reduced, and the work efficiency is significantly improved. There is no need for multiple processes for sorting and processing, which can reduce the cost investment.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims (8)

A classification and screening device for harmless treatment of garbage, comprising a box (1), characterized in that: a feed port (2) is arranged at the top of the box (1), a transmission mechanism (3) is arranged on the right side of the box (1), a separation mechanism (4) is arranged at the rear of the box (1), a discharge port (5) is arranged on the left side of the box (1), and a No. 1 roller (6), a No. 2 roller (7), a smoothing roller (8), a No. 1 crushing roller (10) and a No. 2 crushing roller (11) are respectively arranged on the inner wall of the box (1) , and the first crushing roller (10) and the second crushing roller (11) are located above the first roller (6) and the second roller (7), the smoothing roller (8) is located between the second roller (7) and the first crushing roller (10), the surface of the first roller (6) is connected to the surface of the second roller (7) by a conveyor belt, two fans (9) are arranged on the right wall inside the box (1), and the inner wall of the box (1) is provided with a screen plate (12), and the screen plate (12) is located above the second crushing roller (11); The transmission mechanism (3) comprises a first pulley (31), the surface of the first pulley (31) being connected to the surface of a double-layer pulley (32) through a belt, the surface of the double-layer pulley (32) being connected to the surface of a first small pulley (33) through a belt, a second pulley (34) being arranged at the axis of the first small pulley (33), the surface of the second pulley (34) being connected to the surface of a third pulley (35) through a belt, a second small pulley (36) being arranged at the axis of the third pulley (35), the surface of the second small pulley (36) being connected to the surface of a fourth pulley (37) through a belt, a picking device (38) being arranged on the left side of the box body (1), and a motor (39) being arranged on the right side of the box body (1). A classification and screening device for harmless treatment of garbage according to claim 1, characterized in that: the selection device (38) includes a first gear (381), a second gear (382) is arranged on the surface of the first gear (381), a first sprocket (383) is arranged at the axis of the second gear (382), the surface of the first sprocket (383) is connected to the surface of the second sprocket (384) through a chain, a turntable (385) is arranged at the axis of the second sprocket (384), and a transmission rod (386) is arranged on the left side of the turntable (385). According to claim 2, a classification and screening device for harmless treatment of garbage is characterized in that: the axes of the No. 1 gear (381) and the No. 2 gear (382) are respectively welded and fixed to the axes of the No. 1 crushing roller (10) and the No. 2 crushing roller (11) through connecting rods, the surface of the No. 2 gear (382) is meshed with the surface of the No. 1 gear (381), the axis of the No. 1 sprocket (383) is welded and fixed to the axis of the No. 2 gear (382), the axis of the turntable (385) is welded and fixed to the axis of the No. 2 sprocket (384), the inner wall of the transmission rod (386) is rotatably connected to the left side of the turntable (385) through a connecting rod, the axis of the No. 2 sprocket (384) is rotatably connected to the left side of the box body (1) through a connecting rod, and the inner wall of the transmission rod (386) is rotatably connected to the left side of the screen plate (12) through a connecting rod. A classification and screening device for harmless treatment of garbage according to claim 1, characterized in that: the separation mechanism (4) includes a mounting plate (41), the inner wall of the mounting plate (41) is provided with a clamping strip (42), the rear of the clamping strip (42) is provided with a moving block (43), the bottom of the moving block (43) is provided with an electromagnet (45), and the rear of the mounting plate (41) is provided with an electric push rod (44). According to claim 4, a classification and screening device for harmless treatment of garbage is characterized in that: the surface of the clamping strip (42) is slidably connected to the inner wall of the mounting plate (41), the front part of the moving block (43) is welded and fixed to the rear part of the clamping strip (42), the top of the electromagnet (45) is fixedly mounted on the bottom of the moving block (43), the surface of the electric push rod (44) is connected to the rear part of the mounting plate (41) by bolts, the front part of the mounting plate (41) is connected to the rear part of the box body (1) by bolts, the front part of the moving block (43) is slidably connected to the rear part of the mounting plate (41), and the output end of the electric push rod (44) is fixedly connected to the right side of the moving block (43). According to claim 1, a classification and screening device for harmless treatment of garbage is characterized in that: the left end of the motor (39) is connected to the right side of the box body (1) by bolts, the axis of the No. 2 pulley (34) is welded and fixed to the axis of the No. 1 small pulley (33), and the axis of the No. 2 small pulley (36) is welded and fixed to the axis of the No. 3 pulley (35). According to claim 1, a classification and screening device for harmless treatment of garbage is characterized in that: the feed port (2) is opened at the top of the box body (1), the discharge port (5) is opened on the left side of the box body (1), both ends of the No. 1 roller (6), the No. 2 roller (7), the smoothing roller (8), the No. 1 crushing roller (10) and the No. 2 crushing roller (11) are rotatably connected to the inner wall of the box body (1), the axis of the fan (9) is rotatably connected to the right wall inside the box body (1), and the surface of the screen plate (12) is slidably connected to the inner wall of the box body (1). According to claim 1, a classification and screening device for harmless treatment of garbage is characterized in that: the output end of the motor (39) is welded and fixed to the axis of the No. 1 roller (6), the axis of the No. 1 pulley (31) is welded and fixed to the axis of the No. 2 roller (7) through a connecting rod, the axis of the double-layer pulley (32) is welded and fixed to the axis of the smoothing roller (8) through a connecting rod, the axes of the No. 2 pulley (34) and the No. 3 pulley (35) are welded and fixed to the axes of the two fans (9) through a connecting rod, and the axis of the No. 4 pulley (37) is welded and fixed to the axis of the No. 2 crushing roller (11) through a connecting rod.