CN114798444A - Air-suction type mechanical membrane collecting mixed compound screening device and method - Google Patents

Abstract

A device and a method for screening membrane-collecting mixed compounds by an air-suction machine relate to the technical field of solid separation and are used for separating soil particles and straws in mechanically recovered farmland residual membranes. The screening device comprises a feeding machine, a screening cylinder and a membrane box which are sequentially arranged from front to back, one end of the screening cylinder is conical, the upper end of the feeding machine extends into a small end of one end of the screening cylinder, a throwing part is arranged between a large end of one end of the screening cylinder and the other end of the screening cylinder, the inner wall of the throwing part is provided with a plurality of throwing plates, one end and the other end of the screening cylinder are rotatably connected with a screening cylinder rack, and a screening driving mechanism for driving the screening cylinder to rotate around the axis of the screening cylinder rack is arranged on the screening cylinder rack; the lateral wall of screening section of thick bamboo one end has first screening hole, and the lateral wall of the screening section of thick bamboo other end has second screening hole, and the screening section of thick bamboo other end passes through the tuber pipe to be connected with the suction fan, and the impeller of suction fan includes the circular shape mounting panel, has a plurality of blades that induced draft on a terminal surface of mounting panel. The invention can realize effective separation of residual film and straw.

Description

A kind of air-suction machine film-removing impurity mixture screening device and method

technical field

The invention relates to the technical field of solid separation, in particular to an air-suction machine-collected membrane impurity mixture screening device and method.

Background technique

In response to the problem of residual film pollution in farmland, domestic and foreign scientific research institutes and enterprises have developed various types of residual film recycling machines, and the mechanized recycling technology of residual film has been initially realized. The residual membranes recovered by mechanization are mixed with soil particles, straws (such as cotton stalks) and other impurities. Since there is no efficient residual membrane separation equipment, the recovered membranes and impurities can only be stacked, buried or incinerated at will, causing secondary pollution to the environment. secondary pollution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an air-suction machine film-removing mixed mixture screening device and method, which are used to realize the separation of soil particles and straws in the mechanized recovery of farmland residual film.

The technical solution adopted by the present invention to solve the technical problem is as follows: an air-suction type machine-collected film-collecting mixed-mix screening device, comprising a feeding machine, a screening drum and a film box arranged in sequence from front to back, and the feeding machine is inclined One end of the screening drum is conical, the upper end of the feeding machine extends into the small head of one end of the screening drum, the middle part of the screening drum is a circular throwing part, and the throwing The inner wall of the feeding part is provided with a plurality of throwing plates, one end and the other end of the screening drum are rotatably connected with the screening drum frame, and the screening drum frame has a screening drum that drives the screening drum to rotate around its own axis. Drive mechanism; the side wall of one end of the screening drum has a circular first screening hole, the side wall of the other end of the screening drum has a long second screening hole, and the other end of the screening drum The air duct is connected to the suction fan, the impeller of the suction fan includes a circular mounting plate, one end surface of the mounting plate has several suction blades, and the air outlet of the suction fan is connected to the membrane box.

Further, the other end of the screening drum is conical, the large end of the other end of the screening drum is fixedly connected to the throwing part, and the small end of the other end of the screening drum is connected to the air duct.

Further, the other end of the screening drum is cylindrical.

Further, the length of the suction blade is smaller than the radius of the mounting plate, and the suction blade is perpendicular to the mounting plate.

Further, the feeding machine is a belt conveyor, and the feeding machine includes three drums, the three drums are enclosed in an obtuse-angled triangle, and the two drums located above extend into a small hole at one end of the screening drum. In the head, and between the two rollers above, there is a support plate, the support plate is in contact with the lower surface of the conveyor belt between the two rollers above; there is a rolling component above the support plate, the rolling The assembly includes a rolling roller and a rolling driving mechanism, the rolling roller is rotatably mounted on the end of the rolling roller mounting rod, and the rolling rolling mounting rod includes two movably arranged parts with a preload between the two parts, Under the action of the preload, the rolling roller contacts the upper surface of the conveyor belt between the two rollers above, and the rolling roller rotates synchronously with the conveyor belt under the action of the rolling drive mechanism.

Further, the rolling roller installation rod includes a fixed rod and a telescopic rod, one end of the telescopic rod extends into the inner side of the fixed rod, and the preload is a compression spring located between one end of the telescopic rod and the inner wall of the fixed rod, The other end of the telescopic rod is provided with a roller frame, and the rolling roller is rotatably mounted on the roller frame.

Further, the rolling drive mechanism includes a rolling motor, a driving pulley located at the output end of the rolling motor, an adjusting pulley, and a driven pulley coaxially arranged with the rolling roller. , There is a belt between the driving pulley and the driven pulley, the adjusting pulley and the driving pulley are relatively movable, there is a linkage unit between the driven pulley and the adjusting pulley, and the driven belt When the wheel moves with the rolling roller, the adjustment pulley is driven by the linkage unit to move to keep the belt in a tensioned state.

Further, the linkage unit includes a casing, a pulley support rod slidably disposed in the casing, a driving gear and a driven gear rotatably disposed in the casing, the casing and the fixing rod are relatively fixed, and the adjusting pulley It is rotatably mounted on the pulley support rod, the outer wall of the pulley support rod has teeth and meshes with the driven gear, the driven gear meshes with the drive gear, and the drive gear meshes with the external teeth on the movable rod.

Further, the housing has a guide rail, the guide rail is slidably connected with the pulley support rod, and the guide rail is rotatably connected with the driving gear, and the guide rail and the driven gear.

The present invention also provides an air-suction machine-removed film-removing impurity mixture screening method, comprising the following steps:

(1) Pour the mixture of membrane impurities on the lower end of the feeder, and transport the mixture of membrane impurities into the screening drum through the feeder;

(2) Roll the film mixture at the discharge end of the feeder, and grind the soil particles adhering to the residual film;

(3) Drive the sieving cylinder to rotate, so that the membrane impurity mixture rolls on the inside of the sieving cylinder. During the rolling process, the soil particles and straws in the membrane impurity mixture pass through the sieving hole on the side wall of the sieving cylinder and move out of the sieving cylinder; and At the same time, the residual film in the screening drum is adsorbed by the suction fan.

The beneficial effects of the present invention are:

(1) The residual film is adsorbed by the suction fan, and the weight difference between the straw and the residual film is utilized, so that the residual film is adsorbed by the suction fan, and the straw falls into the screening cylinder to achieve screening;

(2) The setting of the throwing part in the middle of the screening cylinder and the throwing plate on the inner wall of the throwing part can drive the straw and the residual film to a high place and then throw it. To achieve the separation of straw and residual film;

(3) The setting of the first sieving hole at one end of the sieving cylinder first realizes the separation of soil particles in the membrane-mixed mixture, so as to facilitate the subsequent separation of residual membrane and straw.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is the front view of the first embodiment of the screening drum of the present invention;

Fig. 3 is the left side view of the first embodiment of the screening drum of the present invention;

4 is a three-dimensional view of a throwing portion of the present invention;

Figure 5 is a three-dimensional view of a suction fan blade;

Fig. 6 is the front view of the second embodiment of the screening drum of the present invention;

Fig. 7 is the schematic diagram that the helical blade is arranged in the transfer part;

Figure 8 is a schematic diagram of setting a rolling assembly at the discharge end of the feeder;

Figure 9 is a front view of the rolling assembly;

Figure 10 is a partial cross-sectional view of the rolling assembly;

Figure 11 is a side view of the rolling roller and the roller frame;

Figure 12 is a schematic diagram of the movement of the adjustment pulley when the position of the rolling roller moves;

In the picture: 1 screening drum rack, 11 feeding rack, 2 feeding machine, 21 feeding motor, 22 drum, 23 conveyor belt, 24 pallet, 3 screening drum, 31 first screening hole, 32 Support ring, 33 limit ring, 34 ring gear, 35 second screening hole, 36 side shield, 37 middle shield, 38 throwing part, 381 throwing plate, 39 transfer part, 391 spiral blade, 4 air duct , 5 suction fan, 51 asynchronous motor, 52 suction fan frame, 53 transmission mechanism, 54 mounting plate, 55 suction blade, 6 film box, 7 screening motor, 8 rolling roller, 81 roller frame, 82 fixed rod, 821 spring groove, 822 telescopic rod, 83 rolling motor, 84 compression spring, 85 movable rod, 851 external teeth, 86 driven pulley, 87 driving pulley, 88 adjusting pulley, 89 belt, 9 shell, 91 driving gear, 92 driven gear, 93 guide rail, 94 pulley support rod.

Detailed ways

As shown in Figures 1 to 12, the screening device of the present invention includes a feeder 2, a screening drum 3, an air duct 4, a suction fan 5 and a membrane box 6. The present invention will be described in detail below with reference to the accompanying drawings.

As shown in Fig. 1 to Fig. 6, an air-suction type machine-collected film-removing mixed mixture screening device includes a feeding machine 2, a screening drum 3 and a film box 6 arranged in sequence from front to back. The feeder 2 is a belt conveyor or a scraper conveyor. The bottom of the feeder 2 has a feeder frame 11. The feeder 2 is fixed on the feeder frame 11. The feeding motor 21 is used to drive the feeding machine 2 to work. One end of the screening drum 3 is conical, the upper end of the feeder 2 extends into the small head of one end of the screening drum 3, and the middle part of the screening drum 3 is a circular throwing part 38, as shown in Figure 4, The inner wall of the throwing part 38 has a plurality of throwing plates 381 , the throwing plates 381 are flat plates, and an acute included angle is formed between the throwing plates 381 and the axis of the throwing part 38 . The throwing plate 381 may also be in the shape of a curved surface, and the arrangement direction of the throwing plate 381 and the axis of the throwing part 38 form an acute included angle. When the throwing part 38 rotates, the throwing plate 381 rotates with the throwing part 38 . During this process, the throwing plate 381 can hold up the straw and residual film in the throwing part 38 and then throw it out. One end and the other end of the screening drum 3 are rotatably connected to the screening drum frame 1, and the screening drum frame 1 has a screening drive mechanism that drives the screening drum 3 to rotate around its own axis; as shown in Figure 2, the screen The side wall of one end of the screening drum 3 has a circular first screening hole 31, the side wall of the other end of the screening drum 3 has a long second screening hole 35, and the other end of the screening drum 3 is connected with the air duct 4 through the air pipe 4. The suction fan 5 is connected, as shown in FIG. 5 , the impeller of the suction fan 5 includes a circular mounting plate 54, one end surface of the mounting plate 54 has several suction blades 55, and the air outlet of the suction fan 5 is connected with the membrane box 6, The upper part of the film box 6 is mesh-shaped.

When in use, start the feeder 2, and add the mixed membrane mixture (including residual membrane, soil particles and straw) to the lower end of the feeder 2. Under the action of the feeder 2, the membrane and miscellaneous mixture is transported from the low to the high place until it enters Inside the sieving drum 3. The sieving drive mechanism drives the sieving cylinder 3 to rotate around its own axis. At this time, the membrane and impurity mixture rolls in the sieving cylinder 3, and the soil particles fall through the first sieving hole 31, and the residual membrane, straw and large pieces of soil particles fall. Then it rolls along the inner wall of one end of the screening drum 3 to the throwing part 38 . When the throwing part 38 rotates, the throwing plate 381 rotates with the throwing part 38, lifts the residual film, straw and soil particles to a high place and then throws them down. The soil particles contact and collide with the inner wall of the screening cylinder 3 during the falling process and are crushed. , forming small soil particles. When the suction fan is working, the airflow flows from the side of the screening cylinder 3 to the side of the film box 6, and the residual film thrown by the throwing plate 381 passes through the other end of the screening cylinder 3 and the air duct under the action of the airflow generated by the suction fan. 4. After the fan 5 enters the film box 6, the air flows out through the upper part of the film box 6, and the residual film is adsorbed on the inner wall of the film box 6. Since the weight of the straw is greater than the residual film, under the action of the air flow generated by the suction fan, the straw falls to the side where the air duct 4 is located, but the falling point of the straw is located in the other end of the screening drum 3, and the straw falls on the other side of the screening drum 3. After one end is inside, with the rotation of the screening drum 3 , the straw passes through the second screening hole 35 and is separated from the screening drum 3 . After some soil particles move into the other end of the screening drum 3 , they pass through the second screening hole 35 to be separated from the screening drum 3 . Soil particles and straws are moved out of the screening drum 3 through the first and second screening holes at the lower or bottom of the screening drum 3, and the residual film leaves the screening drum from the middle and upper part of the screening drum 3 (that is, the space above the axis of the screening drum). After 3, it enters the air duct 4, which realizes the separation of residual film, straw and soil particles.

Specifically, as shown in FIG. 2 , the other end of the screening drum 3 is also tapered, the large end of the other end of the screening drum 3 is fixedly connected with the throwing part 38 , and the two ends of the screening drum 3 are formed with the throwing part 38 . As a whole, as shown in FIG. 1 , the small head at the other end of the screening drum 3 is connected with the air duct 4 . The two ends of the screening drum 3 are tapered and the middle is cylindrical, so that the two ends of the screening drum 3 are small and the middle is large. When the soil particles and straws in the membrane-mixed mixture roll in the screening drum Under the action of gravity, soil particles and straws will not move out of the screening drum 3 through the other end of the screening drum 3, but will gather at the throwing part 38; After the residual film is moved to a high place, it is dropped, and the dropped residual film is sucked into the film box 6 under the action of the suction fan 5, and the dropped soil particles and straws fall into the other end of the screening cylinder 3 again; With the rotation of the dividing drum 3 , part of the straw and soil particles are moved out of the screening drum 3 through the second screening hole 35 . The straw and soil particles that have not passed through the second sieving hole 35 and moved out of the sieving drum 3 are rolled to the position of the throwing part 38 again, lifted up by the throwing part 38 again, and then thrown down, and so on.

Specifically, the other end of the screening drum 3 can also be of other structures. As shown in FIG. 6 , the other end of the screening drum 3 is a cylindrical transfer part 39 , and the other end of the screening drum 3 is conical. One end of the pipe 4 extends into the transfer part 39 , and the lowest point (ie, the lower edge) of the air duct 4 is higher than the lowest point (ie, the lower edge) of the screening drum 3 . In this way, the straw and soil particles will not roll into the air duct 4 when rolling in the screening drum 3 . Due to the continuous rolling of straws and soil particles in the transfer part 39 , the straws and soil particles gradually pass through the second screening holes 35 and then move out of the screening drum 3 .

Specifically, in order to facilitate the assembly of the screening drum 3, as shown in FIG. 2, both ends of the screening drum 3 have annular support rings 32, and the outer wall of the support ring 32 has annular limit rings 33. Through the rotational connection between the limit ring 33 and the screening drum frame 1, the rotational connection and the axial limit of the screening drum 3 and the screening drum frame 1 are realized.

Specifically, as shown in FIGS. 2 and 3 , the outer wall of the throwing part 38 has a ring gear 34 , as shown in FIG. 1 , the top of the screening drum frame 1 has a screening motor 7 , and the output end of the screening motor 7 has a The gears mesh with the ring gear 34 . An intermediate shield 37 is provided outside the ring gear 34 to protect the ring gear 34 , and the gears pass through the side wall of the intermediate shield 37 to engage with the ring gear 34 . A side shield 36 is also provided on the outside of the other end of the screening drum 3. The side shield 36 has a conical structure. It is fixedly connected with the screening drum frame 1 , and the axis of the side shield 36 is collinear with the axis of the other end of the screening drum 3 . In this way, the straw and soil particles falling through the second screening hole 35 in the other end of the screening drum 3 fall into the side shield 36, and then slide down from a high place to a low place along the inner wall of the side shield 36 to avoid dust. .

Specifically, as shown in FIG. 5 , the impeller of the suction fan 5 includes a circular mounting plate 54 and suction blades 55 . When the impeller rotates, on the one hand, the airflow is driven to flow from the side of the screening cylinder 3 to the side of the membrane box 6; After entering the suction fan 5 by mistake, it collides with the mounting plate 54 and collapses obliquely downward, and falls on the bottom of the suction fan 5, thereby preventing the straw from entering the membrane box 6 with the airflow. The assembly method of the mounting plate 54 and the suction blade 55 can effectively prevent the entanglement of the flexible residual film and form a strong wind pressure adsorption force; wherein the length of the suction blade 55 is smaller than the radius of the circular mounting plate 54, which is conducive to the drainage of the suction wind effect.

Specifically, as shown in FIG. 1, the suction fan 5 is fixed on the upper part of the suction fan frame 52, an asynchronous motor 51 is arranged on the upper part of the suction fan frame 52, and a transmission mechanism 53 is arranged between the output end of the asynchronous motor 51 and the impeller, The power transmission between the output of the asynchronous motor and the input of the impeller is realized by the transmission mechanism 53, and the transmission mechanism 53 may be a belt transmission mechanism.

Specifically, as shown in FIG. 7 , in order to facilitate the movement of the straw in the transfer portion 39 along the axial direction of the screening cylinder 3, a spiral blade 391 is provided on the inner wall of the transfer portion 39. The arrangement of the spiral blade 391 is used to guide the straw along the transfer portion. While rolling, the 39 also moves axially along the transfer part 39 , so that the straw can be spread out in the transfer part 39 , and the straw can be moved out of the screening drum 3 through the second screening hole 35 .

Specifically, as shown in FIG. 8 , the feeding machine 2 is a belt conveyor, and the feeding machine includes three drums 22 , the three drums 22 are enclosed in an obtuse triangle, and the two drums 22 located above extend into the screening drum 3 In the small head of one end, and between the two rollers 22 above, there is a supporting plate 24, and the supporting plate 24 is in contact with the lower surface of the conveyor belt 23 between the two upper rollers 22; the top of the supporting plate 22 has a rolling component, and the rolling component It includes a rolling roller 8 and a rolling driving mechanism. The rolling roller 8 is rotatably installed at the end of the rolling roller mounting rod. The rolling roller mounting rod includes two parts that are movably set and there is a preload between the two parts. The preload Under the action, the rolling roller 8 contacts the upper surface of the conveyor belt 23 between the upper two rollers 22, and the rolling roller rotates synchronously with the conveyor belt 23 under the action of the rolling driving mechanism. The film mixture moves with the conveyor belt 23 and gradually enters the screening drum 3. When the film mixture moves between the upper two rollers 22, the film mixture enters between the rolling roller 8 and the conveyor belt 23, and the rolling roller 8 It rotates synchronously with the conveyor belt 23, and the instantaneous speed direction of the point on the rolling roller 8 in contact with the conveyor belt 23 is the same as the moving direction of the conveyor belt 23. The rolling roller 8 cooperates with the conveyor belt 23 and the supporting plate 24 to The soil particles entering the film-mixture between the rollers 8 and the conveyor belt 23 are crushed. Since part of the residual film will adhere to the soil particles, crushing the soil particles is conducive to the separation of the soil particles and the residual film, which in turn facilitates subsequent screening.

Specifically, as shown in FIG. 8 and FIG. 9 , the rolling roller installation rod includes a fixed rod 82 and a telescopic rod 822. One end of the telescopic rod 822 extends into the spring groove 821 inside the fixed rod 82, as shown in FIG. 11, pre- The tightening member is a compression spring 84 located between one end of the telescopic rod 822 and the spring groove 821 . The other end of the telescopic rod 822 has a roller frame 81 on which the rolling roller 8 is rotatably mounted. There are two rolling roller mounting rods, and the roller frame 81 is installed through the two rolling roller mounting rods. When the film mixture enters between the rolling roller 8 and the conveyor belt 23, the film mixture and the rolling roller 8 are pressed against each other, so that the rolling roller 8 is far away from the conveyor belt 23, and the preload force of the compression spring 84 is overcome at this time. , the portion of the telescopic rod 822 extending into the fixed rod 82 increases. Depending on the thickness and the degree of softness and hardness of the impurity mixture, the distances moved by the rollers 8 relative to the conveyor belt 23 are different.

Specifically, as shown in FIGS. 9 and 10 , the rolling drive mechanism includes a rolling motor 83 , a driving pulley 87 located at the output end of the rolling motor 83 , an adjusting pulley 88 and a driven roller coaxially arranged with the rolling roller 8 . The pulley 86, the adjusting pulley 88, the driving pulley 87 and the driven pulley 86 have a belt 89, the adjusting pulley 88 and the driving pulley 87 are relatively movable, the driven pulley 86 and the adjusting pulley 88 There is a linkage unit between them, and when the driven pulley 86 moves with the rolling roller 8, the adjusting pulley 88 is driven to move by the linkage unit to keep the belt 89 in a tensioned state. As shown in FIGS. 10 and 12 , the linkage unit includes a housing 9 , a pulley support rod 94 slidably arranged in the housing 9 , a driving gear 91 and a driven gear 92 rotatably arranged in the housing 9 , the housing 9 It is relatively fixed to the fixed rod 82, the adjusting pulley 88 is rotatably mounted on the pulley support rod 94, the outer wall of the pulley support rod 94 has teeth and meshes with the driven gear 92, the driven gear 92 meshes with the driving gear 91, and the telescopic rod 822 A movable rod 85 is fixed on it, the movable rod 85 is an L-shaped rod, one end of the movable rod 85 is fixedly connected with the telescopic rod 822, the other end of the movable rod 85 has an external tooth portion 851, the driving gear 91 and the external teeth on the movable rod 85 portion 851 engages. The housing 9 has a guide rail 93 , the guide rail 93 is slidably connected to the pulley support rod 94 , and the guide rail 93 is rotatably connected to the driving gear 91 and the guide rail 93 and the driven gear 92 . The provision of the guide rail 93 is used to realize the installation and guidance of the pulley support rod 94 on the one hand, and realize the installation of the driving gear 91 and the driven gear 92 on the other hand. As shown in FIG. 12 , when the film mixture enters between the roller 8 and the conveyor belt 23 , the roller 8 moves away from the conveyor belt 23 and moves to the side where the fixed rod 82 is located. At this time, the telescopic rod 822 drives the movable rod 85 Moving to the side where the fixed rod 82 is located, the external teeth 851 on the movable rod 85 drive the driving gear 91 to rotate clockwise, which in turn drives the driven gear 92 to rotate counterclockwise, thereby driving the pulley support rod 94 to move away from the driving pulley 87 On the other hand, when the rolling roller 8 approaches the conveyor belt 23, the distance between the driven pulley 86 and the driving pulley 87 increases, and the adjustment pulley 88 moves closer to the conveyor belt 23. One side of the driving pulley 87 moves.

An air-suction machine film-removing impurity mixture screening method, comprising the following steps:

(1) Pour the mixture of membrane impurities on the lower end of the feeder, and transport the mixture of membrane impurities into the screening drum through the feeder;

(2) Roll the film mixture at the discharge end of the feeder, and grind the soil particles adhering to the residual film;

(3) Drive the sieving cylinder to rotate, so that the membrane impurity mixture rolls on the inside of the sieving cylinder. During the rolling process, the soil particles and straws in the membrane impurity mixture pass through the sieving hole on the side wall of the sieving cylinder and move out of the sieving cylinder; and At the same time, the residual film in the screening drum is adsorbed by the suction fan.

In the invention, the residual film is adsorbed by the suction fan, and the weight difference between the straw and the residual film is utilized, so that the residual film is adsorbed by the suction fan, and the straw falls into the screening drum to realize screening; The setting of the throwing plate on the inner wall can drive the straw and the residual film to a high place and then throw it. The thrown residual film and straw have different moving trajectories under the action of the air flow, thereby realizing the separation of the straw and the residual film; The setting of a sieving hole first realizes the separation of soil particles in the membrane-mixed mixture, so as to facilitate the subsequent separation of residual membrane and straw; the setting of the rolling component can crush the soil particles. It is convenient for soil particles to pass through the first sieving hole and then move out of the sieving cylinder; on the other hand, the soil particles adhering to the residual film are crushed to avoid the soil particles adhering to the residual film being moved out of the sieving cylinder through the first sieving hole. The problem of incomplete collection of residual film caused by the cartridge.

Claims (10)

1. The air-suction type machine membrane-collecting miscellaneous mixture screening device comprises a feeding machine, a screening cylinder and a membrane box which are sequentially arranged from front to back, wherein the feeding machine is obliquely arranged; the utility model discloses a screening drum, including screening section of thick bamboo, fan, suction fan, the lateral wall of screening section of thick bamboo one end has the first screening hole of circular shape, the lateral wall of the screening section of thick bamboo other end has the second screening hole of rectangular shape, the screening section of thick bamboo other end passes through the tuber pipe and is connected with the suction fan, the impeller of suction fan includes the circular shape mounting panel, a plurality of blades have on the terminal surface of mounting panel, the air outlet and the membrane case of suction fan are connected.

2. The air-suction type mechanical membrane collecting miscellaneous mixture screening device of claim 1, wherein the other end of the screening cylinder is conical, the large end of the other end of the screening cylinder is fixedly connected with the throwing part, and the small end of the other end of the screening cylinder is connected with an air pipe.

3. The air-aspiration type mechanical-harvest film hybrid screening device as claimed in claim 1, wherein the other end of the screening cylinder is cylindrical.

4. The air-aspiration type mechanical shrinkage film hybrid screening device as claimed in claim 1, wherein the length of the blade is smaller than the radius of the mounting plate, and the blade is arranged perpendicular to the mounting plate.

5. The air-suction type membrane collecting miscellaneous mixture screening device according to claim 1, wherein the feeding machine is a belt conveyor, the feeding machine comprises three rollers, the three rollers form an obtuse triangle, the two rollers above extend into a small end at one end of the screening drum, a supporting plate is arranged between the two rollers above, and the supporting plate is in contact with the lower surface of a conveying belt between the two rollers above; the layer board top has the subassembly that rolls, roll the subassembly including rolling the roller and rolling actuating mechanism, roll the roller and rotate and install and roll roller installation pole tip, roll roller installation pole and have the pretension piece between two parts and the two parts that the activity set up, it is two with the top to roll roller and top under the pretension piece effect conveyor belt upper surface contact between the cylinder, roll the roller under the effect that rolls actuating mechanism and conveyer belt synchronous revolution.

6. The air-suction type machine harvesting membrane miscellaneous mixture screening device according to claim 5, wherein the rolling roller mounting rod comprises a fixed rod and a telescopic rod, one end of the telescopic rod extends into the inner side of the fixed rod, the pretensioning piece is a pretensioning spring positioned between one end of the telescopic rod and the inner wall of the fixed rod, the other end of the telescopic rod is provided with a roller frame, and the rolling roller is rotatably mounted on the roller frame.

7. The air-suction type mechanical film collecting miscellaneous compound screening device according to claim 5, wherein the rolling driving mechanism comprises a rolling motor, a driving pulley, an adjusting pulley and a driven pulley, the driving pulley is located at an output end of the rolling motor, the adjusting pulley and the driven pulley are coaxially arranged with the rolling roller, a belt is arranged among the adjusting pulley, the driving pulley and the driven pulley, the adjusting pulley and the driving pulley are movably arranged relatively, a linkage unit is arranged between the driven pulley and the adjusting pulley, and the driven pulley drives the adjusting pulley to move through the linkage unit when moving along with the rolling roller so as to keep the belt in a tensioned state.

8. The air-aspiration type membrane collecting miscellaneous mixture screening device according to claim 7, wherein the linkage unit comprises a housing, a pulley support rod slidably disposed in the housing, a driving gear and a driven gear rotatably disposed in the housing, the housing is fixed relative to the fixing rod, the adjusting pulley is rotatably mounted on the pulley support rod, the outer wall of the pulley support rod has teeth and is engaged with the driven gear, the driven gear is engaged with the driving gear, and the driving gear is engaged with the outer teeth of the movable rod.

9. The air-aspiration type mechanical-assisted collection membrane hybrid screening device according to claim 8, wherein a guide rail is arranged in the housing, the guide rail is slidably connected with the pulley support rod, and the guide rail is rotatably connected with the driving gear and the guide rail is rotatably connected with the driven gear.

10. The screening method of the air-suction type mechanical-absorption membrane hybrid screening device according to any one of claims 1 to 9, characterized by comprising the following steps:

(1) pouring the membrane impurity mixture into the lower end of a feeding machine, and conveying the membrane impurity mixture into a screening cylinder through the feeding machine;

(2) rolling the film hybrid mixture at the discharge end of the feeding machine, and crushing the soil particles adhered with the residual film;

(3) driving the sieving cylinder to rotate so that the membrane impurity mixture rolls on the inner side of the sieving cylinder, and soil particles and straws in the membrane impurity mixture pass through the sieving holes in the side wall of the sieving cylinder and are removed from the sieving cylinder in the rolling process; meanwhile, residual films in the screening barrel are adsorbed by the suction fan.

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