Screening device and method used in raw material conveying process for organic fertilizer production

Abstract

The invention relates to the technical field of organic fertilizer production, in particular to a screening device and method used in the raw material conveying process for organic fertilizer production. The screening device comprises a filtering element, protrusions are arranged on the filtering element in the discharging direction of raw materials, and the filtering element is integrally in a pot cover shape and is divided into four fan-shaped parts; the screening device further comprises a supporting frame and a feeding spiral conveying barrel, when straw and filaments of the straw are hung at any position of the filtering element, due to the fact that the filtering element has the radian, and the multi-stage height difference exists in the middle position, the filaments of the straw and the filaments of the straw are hung at any position of the filtering element. The heights of the two ends of the straw and filaments hung on the filtering element are basically different, under the gravity pressing effect of materials, stress of the two ends of the straw and the filaments is uneven, under the adhesive tape force effect generated by screening and blanking, large traction force exists at the ends, with large stress, of the straw and the filaments, and therefore the straw and the filaments are separated from each other. Therefore, the straws and filaments thereof are pulled out.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizer production, in particular to a screening device and a method used in a raw material conveying process for organic fertilizer production. Background Art

[0002] Organic fertilizer mainly comes from carbon-containing materials such as sludge, bone meal, animal manure and plant straw, which are fermented and applied to the soil to provide plant nutrition. Organic fertilizer contains a variety of organic acids and peptides as well as rich nutrients including nitrogen, phosphorus and potassium. It can not only provide comprehensive nutrition for crops, but also has a long fertilizer effect. It can increase and renew soil organic matter, promote microbial reproduction, improve the physical and chemical properties and biological activity of the soil, and is the main nutrient for green food production.

[0003] The dry raw materials needed for organic fertilizer need to be screened before preparing organic fertilizer to remove large-particle materials such as stones inside. First, it is to prevent mechanical damage during subsequent mechanical production. Second, impurities in raw materials such as stones are inorganic substances, which will affect the quality of the produced organic fertilizer. When screening is performed in the prior art, Figure 1 As shown, screening is often performed through a filter element 1. The filter element 1 in the prior art has a horizontal filter plate and a drum-shaped filter cartridge. When the filter cartridge is used as the filter element 1, its structure is concave. During the screening process of the filter element 1, because the raw material contains straws of various plants, the flexible and bendable structure of the straw and the filaments inside the straw will hang on the filter element 1. The straw and the filaments 2 hanging on the filter element 1 are difficult to clean. Over time, the filtering effect of the filter element 1 will be directly reduced, thereby directly affecting the efficiency of organic fertilizer screening.

[0004] Therefore, in view of the above problems, a screening device and method for the raw material conveying process of organic fertilizer production are proposed. Summary of the invention

[0005] The object of the present invention is to provide a screening device and method for the raw material transportation process of organic fertilizer production, so as to solve the problem raised in the above-mentioned background technology that "the flexible and bendable structure of the straw and the filaments inside it will hang on the filter element, and the straw and the filaments hanging on the filter element are difficult to clean. In the long run, the filtering effect of the filter element 1 will be directly reduced, thereby directly affecting the efficiency of organic fertilizer screening."

[0006] To achieve the above object, the present invention provides the following technical solution: a screening device for a raw material conveying process in organic fertilizer production, comprising a filter element, wherein the filter element has a protrusion in the feeding direction of the raw material, the filter element is in the shape of a pot cover as a whole, the filter element is divided into four sector-shaped parts, there is a height difference between any two adjacent sector-shaped parts, and the surface and the eyelet of the filter element are chamfered and smoothed; The screening device also includes a support frame and a feeding spiral conveyor cylinder, the top of the support frame is fixedly connected with a transmission box, a transmission spiral conveyor cylinder, a support ring and a camshaft in sequence from left to right, the right side of the transmission box is rotatably connected with a turntable, the outer side of the turntable is evenly fixedly connected with three connecting frames, the inner side of the connecting frame is fixedly connected with a screen cylinder, the screen cylinder can be located at the lower side of the outlet end of the feeding spiral conveyor cylinder, the filter element is installed on the inner side of the screen cylinder, the inner side of the top of the screen cylinder is fixedly connected with evenly distributed wire rods, and the wire rods are perpendicular to the center of the screen cylinder. The inner side of the screen drum is rotatably connected to a swivel, and the inner side of the swivel is fixedly connected to the outer side of the bottom end of the filter element. The filter element can reciprocate on the inner side of the screen drum. When the screen drum is at the uppermost side, the left end feed port of the transmission spiral conveyor drum can be aligned with the bottom end outlet of the screen drum. The inner side of the support ring is rotatably connected to the filter drum. A raw material collection box is provided at the bottom end of the filter drum, and the raw materials after secondary screening by the filter drum can fall into the inner side of the raw material collection box. The right end discharge port of the transmission spiral conveyor drum is provided on the inner side of the left end of the filter drum, and the filter drum is provided in an inclined shape.

[0007] Under the above settings, the present invention can effectively reduce the problem that straw and filaments thereof are hung on the filter element and accumulated, resulting in a direct reduction in the filtering effect of the filter element and directly affecting the screening efficiency of organic fertilizer; Because in the prior art, when screening is performed through a horizontal or concave filter element, when the straw and its filaments are hung on the horizontal filter element or hung in the middle of the concave filter element, because the two ends of the straw and its filaments are hung at the same height, during the screening and discharging process, the material passes through the mesh and generates traction on the two ends of the straw and its filaments, and the forces on the two ends of the straw and its filaments are close to the same, which makes it difficult to discharge the straw and its filaments; In the present invention, a protrusion is set on the filter element toward the feeding direction of the raw materials, the filter element is in the shape of a pot cover as a whole, the filter element is divided into four fan-shaped parts, the surface of the filter element is smooth, there is a height difference between any two adjacent fan-shaped parts, the wire-straightening rod is perpendicular to the center of the screen drum, and the wire-straightening rod can also be a wire-straightening plate extending downward. In this case, the straw and its filaments tend to be distributed in a direction perpendicular to the center of the screen drum when they are dropped. When the straw and its filaments are hung on the filter element of the present invention, because the filter element has an arc and there are multiple levels of height differences in the middle position, the heights of the two ends of the straw and its filaments hung on the filter element of the present invention are basically inconsistent. Under the gravity pressure of the material, the lower the raw material flow rate is, the faster the force on the two ends of the straw and its filaments will be uneven. Under the sticky force generated by the screening and dropping, the end of the straw and its filaments that is subjected to greater force will have a greater traction force, thereby pulling the straw and its filaments out, thereby preventing the straw and its filaments from being entangled on the filter element. In the present invention, the raw material enters the inner side of the screen cylinder from the feeding spiral conveyor cylinder, and is screened once in the screen cylinder. The raw material after the primary filtration falls into the transmission spiral conveyor cylinder and then enters the inner side of the filter cylinder for secondary screening. The screened impurities and raw materials fall into the impurity collection box and the raw material collection box respectively. The filter element of the present invention can perform a small range of reciprocating rotation to increase the filtering efficiency of the filter element. The reciprocating rotation can bring a better shaking effect than the circular motion due to the high and low speed changes, and can prevent the entanglement of straw and its filaments on its surface. The filter element in the present invention is arranged in the screen cylinder, and there are multiple screen cylinders. When the uppermost screen cylinder needs to be cleaned, the turntable can be rotated to realize the replacement of the screen cylinder; As a preferred embodiment of the present invention, the outer side of the screen cylinder is fixedly connected to a connecting shell, the inner side of the connecting shell is rotatably connected to a first bevel gear and a second bevel gear, the first bevel gear and the second bevel gear are meshed with each other, the second bevel gear is coaxially rotatably connected to a third gear, the outer side of the rotating ring is arranged in a gear ring shape, the third gear is meshed with the outer side of the rotating ring, and the reciprocating rotation of the rotating ring and the filter element is realized by the reciprocating rotation of the first bevel gear.

[0008] As a preferred embodiment of the present invention, an electric push rod is fixedly connected to the inner side of the connecting shell, the bottom end of the electric push rod is rotatably connected to a connecting rod via a hinge, the bottom end of the connecting rod is rotatably connected to one side of the first bevel gear via a rotating shaft, the telescopic stroke of the electric push rod is smaller than the straight-line distance from the center of the first bevel gear to the rotating shaft, and the reciprocating rotation of the first bevel gear is achieved by the telescopic movement of the electric push rod.

[0009] In the present invention, the filter element reciprocates in the following manner: the movable end of the electric push rod reciprocates and retracts, the first bevel gear is driven to reciprocate through the connecting rod, and then the rotating ring and the filter element are driven to reciprocate through the second bevel gear and the third gear; As a preferred embodiment of the present invention, a worm and a worm wheel are rotatably connected in the transmission box, the central axis of the worm wheel is fixedly connected to the center position of the turntable, the worm is meshed with the worm wheel, one side of the worm extends out of the transmission box and is fixedly connected to a handle, and the three screen drums are switched at the uppermost position by rotating the handle, and an impurity collection box is provided at the bottom end of another screen drum in the downward direction of the rotation of the uppermost screen drum.

[0010] In the present invention, the rotating disk is rotated in the following manner: the handle drives the worm to rotate, and then the rotation of the worm wheel drives the rotating disk to realize the position switching of multiple screen drums; As a preferred embodiment of the present invention, the bottom end of the support ring on the left side is fixedly connected to a first motor, the end of the main shaft of the first motor is fixedly connected to a first gear, the outer side of the filter cartridge is fixedly connected to a second gear ring, the first gear and the second gear ring are meshed with each other, and the rotation of the filter cartridge is realized by the rotation of the first motor.

[0011] As a preferred embodiment of the present invention, the top end of the support frame is rotatably connected to a reel, and the reel is rotatably arranged on the inner side of the top end of the filter cartridge. The rotation direction of the reel is opposite to that of the filter cartridge, and the outer side of the reel is fixedly connected to rows of picking rods, through which the straw and filaments hung and entangled on the inner side of the filter cartridge are picked out.

[0012] As a preferred embodiment of the present invention, the side surfaces of the lifting rods are arranged in a sickle shape, and the lifting rods distributed in rows are arranged in a staggered manner.

[0013] As a preferred embodiment of the present invention, a second motor is fixedly connected to the right side of the support ring on the right side, a second gear is fixedly connected to the end of the main shaft of the second motor, a first gear ring is fixedly connected to the outer side of the right end of the reel, the first gear ring is meshed with the second gear, and the reel is rotated by the rotation of the second motor.

[0014] Under the above setting, in the secondary screening, the rotation directions of the reel and the filter cartridge are opposite, and the picking rods staggered on the reel can pick out the straw and its filaments hanging on the inner side of the filter cartridge; the opposite rotation direction can increase the speed and force when picking out the straw and its filaments, and the reel rotates in such a way that the second motor rotates through the second gear to rotate the first gear ring, thereby rotating the reel.

[0015] As a preferred embodiment of the present invention, the camshaft is fixedly arranged on the inner side of the reel, a sliding rod is slidably connected to the inner side of the reel, a cutter is fixedly connected to the side of the sliding rod away from the center of the reel, a spring is arranged on the outer side of the sliding rod, two ends of the spring are respectively fixedly connected to the inner side of one end of the sliding rod and the inner side of the reel, when the sliding rod passes through the fixed camshaft, it will move to the side away from the center of the reel to make the cutter perform a cutting movement, and the spring is used to play a resetting role.

[0016] During the picking process, if the straw and its filaments are wound around the reel, during the rotation of the reel, the sliding rod inside the reel will pass through the camshaft and move to the side away from the center of the reel under the action of the camshaft. At this time, the cutter will also move to the side away from the center of the reel to make the cutter perform a cutting motion, thereby cutting off the straw and its filaments wound around the reel, thereby preventing the straw and its filaments from clogging the screening holes during the secondary screening process. The aperture of the filter cartridge is smaller than the aperture of the filter element inside the screen cartridge, and is used to perform layered screening.

[0017] The screening method in the raw material conveying process for organic fertilizer production comprises the following steps: Step 1: The raw material enters the inner side of the screen cylinder from the feeding screw conveyor cylinder and is screened once in the screen cylinder; Step 2: After the primary filtration, the raw materials fall into the transmission screw conveyor and then enter the inner side of the filter cylinder for secondary screening.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The screening device used in the raw material conveying process of organic fertilizer production can effectively reduce the problem that straw and its filaments are hung on the filter element and accumulated, which directly reduces the filtering effect of the filter element and directly affects the screening efficiency of organic fertilizer. Because in the prior art, when screening is performed through a horizontal or concave filter element, when the straw and its filaments are hung on the horizontal filter element or hung in the middle position of the concave filter element, because the two ends of the straw and its filaments are suspended at the same height, during the screening and discharging process, the material passes through the mesh and generates traction on the two ends of the straw and its filaments. The forces on the two ends of the straw and its filaments are close to the same, which makes it difficult for the straw and its filaments to be discharged. In the present invention, the filter element is directed toward the raw material. A protrusion is set in the feeding direction, the filter element is in the shape of a pot cover as a whole, the filter element is divided into four fan-shaped parts, the surface of the filter element is smooth, and there is a height difference between any two adjacent fan-shaped parts. In this case, when the straw and the filaments are hung on the filter element of the present invention, because the filter element has an arc and there are multiple levels of height differences in the middle position, the heights of the two ends of the straw and the filaments hung on the filter element of the present invention will be basically inconsistent. Under the gravity pressure of the material, the force on the two ends of the straw and the filaments will be uneven. Under the action of the sticky force generated by the screening and dropping of the material, the end of the straw and the filaments that is subjected to greater force will have a greater traction force, thereby pulling the straw and the filaments out, thereby preventing the straw and the filaments from being entangled on the filter element.

[0019] 2. The screening device used in the raw material transportation process of organic fertilizer production, the raw materials enter the inner side of the screen cylinder from the feeding spiral conveyor cylinder, and are screened once in the screen cylinder. The raw materials after the first filtration fall into the transmission spiral conveyor cylinder and then enter the inner side of the filter cylinder for secondary screening. The screened impurities and raw materials fall into the impurity collection box and the raw material collection box respectively.

[0020] 3. The screening device used in the raw material conveying process of organic fertilizer production, the filter element in the present invention can perform a small range of reciprocating rotation to increase the filtering efficiency of the filter element, the reciprocating rotation can bring a better shaking effect compared with the circular motion because of the high and low speed changes, and can prevent the straw and its filaments from being entangled on its surface. The filter element in the present invention is arranged in the screen cylinder, and there are multiple screen cylinders. When the uppermost screen cylinder needs to be cleaned, the turntable can be rotated to achieve the replacement of the screen cylinder.

[0021] 4. The screening device used in the raw material conveying process of organic fertilizer production, in the secondary screening, the rotation directions of the reel and the filter cartridge are opposite, and the picking rods staggered on the reel can pick out the straw and the filaments thereof hanging on the inner side of the filter cartridge; the opposite rotation direction can increase the speed and strength of picking out the straw and the filaments thereof, and the rotation mode of the reel is that the second motor rotates through the second gear to rotate the first gear ring, thereby rotating the reel, and in the picking out process, if the straw and the filaments thereof are wound around the reel, during the rotation of the reel, the sliding rod inside the reel will pass through the camshaft and move to a side away from the center of the reel under the action of the camshaft, at this time, the cutter will also move to a side away from the center of the reel to make the cutter perform a cutting motion, and cut off the straw and the filaments thereof wound around the reel, thereby preventing the straw and the filaments thereof from clogging the screening holes during the secondary screening process, wherein the aperture of the filter cartridge is smaller than the aperture of the filter element inside the screen cartridge, and is used to play a role of layered screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of using a filter element to screen out the blockage caused by straw and its filaments in the prior art; Figure 2 It is a schematic diagram of the overall installation structure of the present invention; Figure 3 This is a schematic diagram of the appearance structure of the turntable of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the installation structure at A in FIG. Figure 5 This is a schematic diagram of the appearance structure of the filter element in the present invention; Figure 6 It is a schematic diagram of the installation structure of the connecting rod of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure inside the filter cartridge of the present invention; Figure 8 It is a schematic diagram of the installation structure of the camshaft of the present invention; Fig. 9 It is a schematic diagram of the appearance structure of the camshaft of the present invention; Fig.10 It is a schematic diagram of the internal cross-sectional installation structure of the worm in the transmission box of the present invention; Fig.11 The figure is a schematic diagram of the top view of the cable management pole of the present invention.

[0023] In the figure: 1, filter element; 101, fan-shaped part; 2, straw and filaments thereof; 3, support frame; 4, transmission box; 5, turntable; 6, turn handle; 7, connecting frame; 8, screen cylinder; 9, feeding screw conveyor cylinder; 10, transmission screw conveyor cylinder; 11, first motor; 12, first gear; 13, support ring; 14, filter cylinder; 15, second motor; 16, second gear; 17, reel; 18, camshaft; 19, first gear ring; 20, connecting shell; 21, rotating ring; 22, impurity collection box; 23, first bevel gear; 24, second bevel gear; 25, third gear; 26, connecting rod; 27, electric push rod; 28, lifting rod; 29, spring; 30, cutter; 31, worm gear; 32, worm; 33, second gear ring; 34, raw material collection box; 35, slide rod; 36, wire management rod. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1 See also Figure 1-Figure 6 , Fig.10 and Fig.11 , the present invention provides a technical solution: A screening device used in a raw material conveying process for organic fertilizer production comprises a filter element 1, the filter element 1 has a protrusion in the feeding direction of the raw material, the filter element 1 is in the shape of a pot cover as a whole, the filter element 1 is divided into four sector-shaped parts 101, there is a height difference between any two adjacent sector-shaped parts 101, and the surface and the holes of the filter element 1 are chamfered and smoothed to reduce friction; The screening device also includes a support frame 3 and a feeding spiral conveyor cylinder 9. The top of the support frame 3 is fixedly connected with a transmission box 4, a transmission spiral conveyor cylinder 10, a support ring 13 and a cam shaft 18 from left to right in sequence. The right side of the transmission box 4 is rotatably connected with a turntable 5. The outer side of the turntable 5 is evenly fixedly connected with three connecting frames 7. The inner side of the connecting frame 7 is fixedly connected with a screen drum 8. The screen drum 8 can be located at the lower side of the outlet end of the feeding spiral conveyor cylinder 9. The filter element 1 is installed on the inner side of the screen drum 8. The inner side of the top of the screen drum 8 is fixedly connected with evenly distributed wire rods 36. The wire rods 36 are perpendicular to the center of the screen drum 8. The screen drum The inner side of the filter element 8 is rotatably connected with a swivel ring 21, and the inner side of the swivel ring 21 is fixedly connected to the outer side of the bottom end of the filter element 1. The filter element 1 can reciprocate on the inner side of the screen drum 8. When the screen drum 8 is at the uppermost side, the left end feed port of the transmission spiral conveyor drum 10 can be aligned with the bottom end outlet of the screen drum 8. The inner side of the support ring 13 is rotatably connected with the filter drum 14. The bottom end of the filter drum 14 is provided with a raw material collection box 34. The raw materials after secondary screening by the filter drum 14 can fall into the inner side of the raw material collection box 34. The right end discharge port of the transmission spiral conveyor drum 10 is arranged on the inner side of the left end of the filter drum 14, and the filter drum 14 is arranged in an inclined shape.

[0026] Under the above settings, the present invention can effectively reduce the problem that the straw and its filaments 2 are hung on the filter element and accumulated, resulting in a direct reduction in the filtering effect of the filter element 1 and directly affecting the screening efficiency of the organic fertilizer; Because in the prior art, when screening is performed through a horizontal or concave filter element 1, when the straw and the filaments 2 are hung on the horizontal filter element 1 or hung in the middle of the concave filter element 1, because the two ends of the straw and the filaments 2 are hung at the same height, during the screening and discharging process, the material passes through the mesh and generates traction on the two ends of the straw and the filaments 2, and the forces on the two ends of the straw and the filaments 2 are close to the same, which makes it difficult for the straw and the filaments 2 to be discharged; In the present invention, a protrusion is set on the filter element 1 toward the feeding direction of the raw material, and the filter element 1 is in the shape of a pot cover as a whole. The filter element 1 is divided into four fan-shaped parts 101, and the surface of the filter element 1 is smooth. There is a height difference between any two adjacent fan-shaped parts 101. The wire-straightening rod 36 is perpendicular to the center of the screen cylinder 8, and the wire-straightening rod 36 can also be a wire-straightening plate extending downward. In this case, the straw and its filaments 2 will tend to be distributed in the direction perpendicular to the center of the screen cylinder when falling. When the straw and its filaments 2 are hung on the filter element 1 of the present invention, because the filter element 1 has an arc and there are multiple levels of height differences in the middle position, the heights of the two ends of the straw and its filaments 2 hung on the filter element 1 of the present invention are basically inconsistent. Under the gravitational pressure of the material, the force on the two ends of the straw and its filaments 2 will be uneven. Under the sticky force generated by the screening and dropping, the end of the straw and its filaments 2 that is subjected to greater force will have a greater traction force, thereby pulling out the straw and its filaments 2, thereby preventing the straw and its filaments 2 from being entangled on the filter element 1; In the present invention, the raw material enters the inner side of the screen cylinder 8 from the feeding screw conveyor cylinder 9, and is screened once in the screen cylinder 8. The raw material after the primary filtration falls into the transmission screw conveyor cylinder 10 and then enters the inner side of the filter cylinder 14 to be screened twice. The screened impurities and raw materials fall into the impurity collection box 22 and the raw material collection box 34 respectively. The filter element 1 of the present invention can perform a small range of reciprocating rotation to increase the filtering efficiency of the filter element 1. The reciprocating rotation can bring a better shaking effect than the circular motion because of the high and low speed changes, and can prevent the straw and the filaments 2 from being entangled on its surface; The filter element 1 in the present invention is arranged in the screen cylinder 8. There are multiple screen cylinders 8. When the uppermost screen cylinder 8 needs to be cleaned, the turntable 5 can be rotated to realize the replacement of the screen cylinder 8. Specifically, the outer side of the screen drum 8 is fixedly connected to the connecting shell 20, and the inner side of the connecting shell 20 is rotatably connected to the first bevel gear 23 and the second bevel gear 24, the first bevel gear 23 and the second bevel gear 24 are meshed, and the second bevel gear 24 is coaxially rotatably connected to the third gear 25, the outer side of the rotating ring 21 is arranged in a gear ring shape, and the third gear 25 is meshed with the outer side of the rotating ring 21, and the reciprocating rotation of the first bevel gear 23 is realized. Reciprocating rotation of the rotating ring 21 and the filter element 1 is realized.

[0027] Specifically, an electric push rod 27 is fixedly connected to the inner side of the connecting shell 20, and the bottom end of the electric push rod 27 is rotatably connected to a connecting rod 26 via a hinge. The bottom end of the connecting rod 26 is rotatably connected to one side of the first bevel gear 23 via a rotating shaft. The telescopic stroke of the electric push rod 27 is smaller than the straight-line distance from the center of the first bevel gear 23 to the rotating shaft, and the reciprocating rotation of the first bevel gear 23 is achieved by the telescopic movement of the electric push rod 27.

[0028] In the present invention, the filter element 1 reciprocates in the following manner: the movable end of the electric push rod 27 reciprocates and retracts, the first bevel gear 23 is driven to reciprocate through the connecting rod 26, and then the swivel 21 and the filter element 1 are driven to reciprocate through the second bevel gear 24 and the third gear 25; Specifically, a worm 31 and a worm wheel 32 are rotatably connected in the transmission box 4, the central axis of the worm wheel 32 is fixedly connected to the center position of the turntable 5, the worm 31 is meshed with the worm wheel 32, one side of the worm 31 extends out of the transmission box 4 and is fixedly connected to a handle 6, and the three sieve drums 8 are switched at the uppermost position by rotating the handle 6, and an impurity collection box 22 is provided at the bottom of another sieve drum 8 in the downward direction of the uppermost sieve drum 8.

[0029] In the present invention, the rotating disk 5 is rotated in the following manner: the turning handle 6 drives the worm 31 to rotate, and then the rotation of the worm wheel 32 drives the rotating disk 5 to realize the position switching of the multiple screen drums 8 .

[0030] Example 2 This embodiment is a further improvement of embodiment 1. Figure 1-Figure 11 , The bottom end of the left support ring 13 is fixedly connected to the first motor 11, the end of the main shaft of the first motor 11 is fixedly connected to the first gear 12, the outer side of the filter cartridge 14 is fixedly connected to the second gear ring 33, the first gear 12 and the second gear ring 33 are meshed, and the rotation of the filter cartridge 14 is achieved by the rotation of the first motor 11.

[0031] Specifically, the top of the support frame 3 is rotatably connected to a reel 17, which is rotatably arranged on the inner side of the top of the filter cartridge 14. The reel 17 rotates in the opposite direction to the filter cartridge 14. The outer side of the reel 17 is fixedly connected to rows of picking rods 28, which are used to pick out the straw and filaments 2 hung and entangled on the inner side of the filter cartridge 14.

[0032] Specifically, the side surfaces of the lifting rods 28 are arranged in a sickle shape, and the lifting rods 28 distributed in rows are arranged in a staggered manner.

[0033] Specifically, a second motor 15 is fixedly connected to the right side of the right support ring 13, a second gear 16 is fixedly connected to the end of the main shaft of the second motor 15, a first gear ring 19 is fixedly connected to the outer side of the right end of the reel 17, the first gear ring 19 is meshed with the second gear 16, and the reel 17 is rotated by the rotation of the second motor 15.

[0034] Under the above setting, in the secondary screening, the rotation direction of the reel 17 is opposite to that of the filter cartridge 14, and the staggered picking rods 28 on the reel 17 can pick out the straw and its filaments 2 hanging on the inner side of the filter cartridge 14; the opposite rotation direction can increase the speed and force when picking out the straw and its filaments 2, and the rotation method of the reel 17 is that the second motor 15 rotates through the second gear 16 to rotate the first gear ring 19, thereby rotating the reel 17.

[0035] Specifically, the camshaft 18 is fixedly arranged on the inner side of the reel 17, and a slide rod 35 is slidably connected to the inner side of the reel 17. A cutter 30 is fixedly connected to the side of the slide rod 35 away from the center of the reel 17. A spring 29 is arranged on the outer side of the slide rod 35. The two ends of the spring 29 are respectively fixedly connected to the inner side of one end of the slide rod 35 and the inner side of the reel 17. When the slide rod 35 passes through the fixed camshaft 18, it will move to the side away from the center of the reel 17 to make the cutter 30 perform a cutting movement. The spring 29 is used to play a resetting role.

[0036] During the picking process, if the straw and its filaments 2 are wound on the reel 17, during the rotation of the reel 17, the sliding rod 35 inside the reel 17 will pass through the camshaft 18 and move to the side away from the center of the reel 17 under the action of the camshaft 18. At this time, the cutter 30 will also move to the side away from the center of the reel 17 so that the cutter 30 performs a cutting movement, cutting off the straw and its filaments 2 wound on the reel 17, thereby preventing the straw and its filaments 2 from clogging the screening holes during the secondary screening process. The aperture of the filter cartridge 14 is smaller than the aperture of the filter element 1 inside the screen cartridge 8, so as to play a role in layered screening.

[0037] The present invention also discloses a screening method in a raw material conveying process for organic fertilizer production, the steps of which are: Step 1: The raw material enters the inner side of the screen cylinder 8 from the feeding screw conveyor cylinder 9, and is screened once in the screen cylinder 8; Step 2: The raw materials after the primary filtration fall into the transmission screw conveyor cylinder 10 and then enter the inner side of the filter cylinder 14 for secondary screening.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening device for use in a raw material conveying process for organic fertilizer production, comprising a filter element (1), characterized in that: The filter element (1) has a protrusion in the direction of feeding the raw material, the filter element (1) is in the shape of a pot cover as a whole, the filter element (1) is divided into four sector-shaped parts (101), there is a height difference between any two adjacent sector-shaped parts (101), and the surface and holes of the filter element (1) are chamfered and smoothed; The screening device further comprises a support frame (3) and a feeding screw conveyor cylinder (9), wherein the top end of the support frame (3) is fixedly connected to a transmission box (4), a transmission screw conveyor cylinder (10), a support ring (13) and a cam shaft (18) in sequence from left to right, the right side of the transmission box (4) is rotatably connected to a turntable (5), the outer side of the turntable (5) is evenly fixedly connected to three connecting frames (7), the inner side of the connecting frame (7) is fixedly connected to a screen cylinder (8), the screen cylinder (8) can be located at the lower side of the outlet end of the feeding screw conveyor cylinder (9), the filter element (1) is mounted on the inner side of the screen cylinder (8), and the inner side of the top end of the screen cylinder (8) is fixedly connected to evenly distributed wire management rods (36), which are perpendicular to the center of the screen cylinder (8). The inner side of the sieve drum (8) is rotatably connected to a rotating ring (21), the inner side of the rotating ring (21) is fixedly connected to the outer side of the bottom end of the filter element (1), the filter element (1) can reciprocate on the inner side of the sieve drum (8), when the sieve drum (8) is at the uppermost side, the left end feed port of the transmission screw conveyor drum (10) can be aligned with the bottom end outlet of the sieve drum (8), the inner side of the support ring (13) is rotatably connected to a filter drum (14), the bottom end of the filter drum (14) is provided with a raw material collection box (34), the raw materials after secondary screening of the filter drum (14) can fall into the inner side of the raw material collection box (34), the right end discharge port of the transmission screw conveyor drum (10) is arranged on the inner side of the left end of the filter drum (14), and the filter drum (14) is arranged in an inclined state.

2. The screening device for raw material transportation in organic fertilizer production according to claim 1, characterized in that: The outer side of the sieve drum (8) is fixedly connected to a connecting shell (20), the inner side of the connecting shell (20) is rotatably connected to a first bevel gear (23) and a second bevel gear (24), the first bevel gear (23) and the second bevel gear (24) are meshed with each other, the second bevel gear (24) is coaxially rotatably connected to a third gear (25), the outer side of the rotating ring (21) is arranged in a gear ring shape, the third gear (25) is meshed with the outer side of the rotating ring (21), and the reciprocating rotation of the first bevel gear (23) realizes the reciprocating rotation of the rotating ring (21) and the filter element (1).

3. The screening device in the raw material conveying process for organic fertilizer production according to claim 2, characterized in that: An electric push rod (27) is fixedly connected to the inner side of the connecting shell (20); the bottom end of the electric push rod (27) is rotatably connected to a connecting rod (26) via a hinge; the bottom end of the connecting rod (26) is rotatably connected to one side of the first bevel gear (23) via a rotating shaft; the telescopic stroke of the electric push rod (27) is less than the linear distance from the center of the first bevel gear (23) to the rotating shaft; and the reciprocating rotation of the first bevel gear (23) is achieved by the telescopic movement of the electric push rod (27).

4. The screening device for the raw material conveying process of organic fertilizer production according to claim 3, characterized in that: A worm (31) and a worm wheel (32) are rotatably connected in the transmission box (4); the central axis of the worm wheel (32) is fixedly connected to the central position of the turntable (5); the worm (31) and the worm wheel (32) are meshed; one side of the worm (31) extends out of the transmission box (4) and is fixedly connected to a turning handle (6); the three sieve drums (8) are switched to the uppermost position by rotating the turning handle (6); and an impurity collection box (22) is provided at the bottom end of another sieve drum (8) in the lower direction of the uppermost sieve drum (8).

5. The screening device for the raw material conveying process of organic fertilizer production according to any one of claims 1 to 4, characterized in that: The bottom end of the support ring (13) on the left side is fixedly connected to a first motor (11), the end of the main shaft of the first motor (11) is fixedly connected to a first gear (12), the outer side of the filter cartridge (14) is fixedly connected to a second gear ring (33), the first gear (12) and the second gear ring (33) are meshed, and the rotation of the filter cartridge (14) is achieved by the rotation of the first motor (11).

6. The screening device for raw material transportation in organic fertilizer production according to claim 5, characterized in that: The top end of the support frame (3) is rotatably connected to a reel (17), the reel (17) being rotatably arranged on the inner side of the top end of the filter cartridge (14), the reel (17) rotating in a direction opposite to that of the filter cartridge (14), and the outer side of the reel (17) being fixedly connected to lifting rods (28) distributed in a row, the lifting rods (28) being used to lift out the straw and the filaments (2) hung and wound on the inner side of the filter cartridge (14).

7. The screening device for the raw material conveying process of organic fertilizer production according to claim 6, characterized in that: The side surfaces of the lifting rods (28) are arranged in a sickle shape, and the lifting rods (28) arranged in rows are arranged in a staggered manner.

8. The screening device for raw material transportation in organic fertilizer production according to claim 7, characterized in that: A second motor (15) is fixedly connected to the right side of the support ring (13) on the right side, a second gear (16) is fixedly connected to the end of the main shaft of the second motor (15), a first gear ring (19) is fixedly connected to the outer side of the right end of the reel (17), the first gear ring (19) is meshed with the second gear (16), and the reel (17) is rotated by the rotation of the second motor (15).

9. The screening device for raw material transportation in organic fertilizer production according to claim 8, characterized in that: The cam shaft (18) is fixedly arranged on the inner side of the reel (17); a slide rod (35) is slidably connected to the inner side of the reel (17); a cutter (30) is fixedly connected to the side of the slide rod (35) away from the center of the reel (17); a spring (29) is arranged on the outer side of the slide rod (35); two ends of the spring (29) are respectively fixedly connected to the inner side of one end of the slide rod (35) and the inner side of the reel (17); when the slide rod (35) passes through the fixed cam shaft (18), it moves to the side away from the center of the reel (17) so that the cutter (30) performs a cutting movement.

10. A screening method for raw material transportation in organic fertilizer production, characterized in that: Using the screening device according to claim 9, the steps are: Step 1: The raw material enters the inner side of the screen drum (8) from the feeding screw conveyor drum (9), and is screened once in the screen drum (8); Step 2: The raw materials after the primary filtration fall into the transmission screw conveyor cylinder (10) and then enter the inner side of the filter cylinder (14) for secondary screening.

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