Cylindrical primary screening machine for coarse cereals

Abstract

The utility model discloses a coarse cereal cylinder primary screening machine which comprises a box body, a screen drum is arranged in the box body, two positioning drum bodies are arranged at the two ends of the screen drum, the screen drum comprises a plurality of screen drum units which are coaxially arranged, every two adjacent screen drum units are connected end to end, and each screen drum unit is formed by splicing two semi-arc-shaped screen plates. Two carrier rollers are symmetrically arranged on the two sides of the bottom of each positioning barrel, a motor is arranged at the front end of the box body, a driving gear is fixed to an output shaft of the motor, an outer gear ring capable of being meshed with the driving gear is arranged on the outer wall of the positioning barrel above the driving gear in the circumferential direction, a feeding pipe is arranged at the front end of the box body, and a discharging opening is formed in the bottom of the box body; the front end face of each screen drum unit is provided with a first annular boss, the rear end face of each screen drum unit is provided with a first annular groove matched with the corresponding first annular boss, and the head ends and the tail ends of every two adjacent screen drum units are connected in a socket fit mode through the first annular grooves and the first annular bosses. The vibrating screen is convenient to disassemble and assemble, low in maintenance and repair cost and large in screening range.

Description

Technical Field

[0001] The utility model relates to the technical field of miscellaneous grain production equipment, in particular to a cylindrical primary screening machine for miscellaneous grains. Background Art

[0002] Coarse grains usually refer to grain and bean crops other than the five major crops of rice, wheat, corn, soybean and grass. They mainly include: sorghum, millet, buckwheat (sweet buckwheat, bitter buckwheat), oats (naked oats), barley, millet, sorghum, coix seed, amaranth, kidney beans (kidney beans), mung beans, adzuki beans (red beans, red beans), broad beans, peas, cowpeas, lentils (soldier beans), black beans, etc. They are characterized by short growth period, small planting area, special planting areas, low yields, and generally contain rich nutrients. The production of coarse grains generally uses a cylindrical primary screening machine to remove rice ears, stems, straw, mud and stones, hemp ropes and other large impurities to improve the efficiency of the subsequent cleaning equipment.

[0003] At present, the cleaning effect of the drum primary screening machine used in the production of grains deteriorates after long-term use, which is generally caused by the damage of the screen cylinder. The screen cylinder needs to be replaced. Since the existing screen cylinder is an integrated structure, the replacement and maintenance cost is high. In addition, since the sizes of different grains vary greatly, improper selection of screen holes will also lead to poor primary screening effects of different grains. It is necessary to frequently replace the appropriate screen plate, and it is time-consuming and labor-intensive to replace the screen cylinder. In addition, the current primary screening machine can only separate large grains from grains, and the screening range is small and the screening efficiency is poor. Utility Model Content

[0004] The utility model provides a drum primary screening machine for grains, which solves the problems of time-consuming and labor-intensive replacement of sieve plates in traditional drum screens, high sieve plate maintenance and repair costs, low screening efficiency and small screening range.

[0005] The utility model provides a cylindrical primary screening machine for grains, comprising a box body, a screen drum is arranged in the box body, two positioning cylinders are arranged at both ends of the screen drum, the screen drum comprises a plurality of coaxially arranged screen drum units, two adjacent screen drum units are connected end to end, each screen drum unit is formed by splicing two semi-arc sieve plates, two rollers are symmetrically arranged on both sides of the bottom of each positioning cylinder, a motor is arranged at the front end of the box body, a driving gear is coaxially fixed on the output shaft of the motor, an outer gear ring that can mesh with the driving gear is arranged on the outer wall of the positioning cylinder above the driving gear in the circumferential direction, a feeding pipe for feeding material into the screen drum is arranged at the front end of the box body, and a discharge port is arranged at the bottom of the box body.

[0006] Furthermore, a first annular boss is arranged on the front end face of each screen drum unit, and a first annular groove matching the first annular boss is arranged on the rear end face, and the head and tail ends of two adjacent screen drum units are connected to the first annular boss through the first annular groove and the first annular boss by socket fitting.

[0007] Furthermore, a first connecting block is provided on the upper side wall of each screen plate, and a second connecting block is provided on the lower side wall, a plurality of first guide holes are provided on the docking surface of the first connecting block, a plurality of guide columns are provided on the docking surface of the second connecting block, positioning holes are radially provided on the side walls of the guide columns, a mounting hole is radially provided in the middle of the first guide hole, a second guide hole penetrating the outer side wall of the first connecting block is provided on the bottom of the mounting hole, a guide shaft which can cooperate with the second guide hole is passed through the second guide hole and the mounting hole, a limiting boss is provided on the outer end of the guide shaft, a compression spring is coaxially sleeved on the side wall of the guide shaft located in the mounting hole, one end of the compression spring is elastically fixedly connected to the bottom of the mounting hole, and the other end is elastically fixedly connected to the positioning boss provided on the outer wall of the guide shaft.

[0008] Furthermore, an annular track is sleeved on the outer wall of each positioning cylinder, and an annular guide groove is provided on the outer wall of the annular track. The roller part of the roller extends into the annular guide groove for guidance and cooperation.

[0009] Furthermore, a second annular boss is provided on the end face of the positioning cylinder at the front end of the box body, and is socket-fitted with a first annular groove provided on the end face of the corresponding screen drum unit. A second annular groove is provided on the end face of the positioning cylinder at the rear end of the box body, and is socket-fitted with a first annular boss provided on the end face of the corresponding screen drum unit.

[0010] Furthermore, a plurality of spirally distributed guide bosses are arranged on the inner walls of the screen cylinder and the two positioning cylinders.

[0011] It can be seen from the above technical solutions that the utility model provides a cylindrical primary screening machine for grains.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model decomposes the screen drum into a plurality of screen drum units, and installs the screen drum units by splicing two half-arc sieve plates, so it is convenient to disassemble and replace the locally damaged parts of the screen drum, and the maintenance cost is low. At the same time, each screen drum unit is connected by a socket structure, and the screen drum unit is spliced ​​by two half-arc sieve plates, so it is convenient to remove the screen drum to clean up the debris, and the disassembly and installation are convenient. The outer gear ring is driven to rotate by the motor-driven active gear, so the screen drum can be quickly started and screened. At the same time, different rotation speeds can be quickly matched according to the feed amount of the screen drum to prevent the sieve drum from being blocked by accumulated materials. By sequentially installing the screen drum units with different sieve holes, rapid grading and screening of large and small grains and grains of various specifications can be achieved, and the screening range is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 This is a schematic diagram of the overall structure of a cylindrical primary screening machine for grains proposed by the utility model;

[0016] Figure 2 This is a partial structural schematic diagram of a cylindrical primary screening machine for grains proposed by the utility model;

[0017] Figure 3 The utility model is a schematic diagram of the partially enlarged structure of a cylindrical primary screening machine for grains.

[0018] In the figure:

[0019] 1- box body; 11- feeding pipe; 12- discharge port;

[0020] 2-sieve drum; 21-sieve drum unit; 22-sieve plate; 23-first connecting block; 24-second connecting block; 211-first annular boss; 212-first annular groove; 231-first guide hole; 232-mounting hole; 233-second guide hole; 234-guide shaft; 235-limiting boss; 236-positioning boss; 241-guide column; 242-positioning hole; 243-compression spring;

[0021] 3-positioning cylinder; 30-guide boss; 31-annular track; 311-annular guide groove; 32-second annular boss; 33-second annular groove;

[0022] 4- roller;

[0023] 5-motor; 51-driving gear; 52-external gear ring;

[0024] 6-Bolts. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] Embodiment 1:

[0027] See also Figure 1-3A cylindrical primary screening machine for grains comprises a box body 1, the bottom of the box body 1 is supported by a base, a horizontal screen drum 2 is arranged in the box body 1, two positioning cylinders 3 are coaxially arranged at both ends of the screen drum 2, the screen drum 2 comprises a plurality of coaxially arranged screen drum units 21, two adjacent screen drum units 21 are connected end to end, each screen drum unit 21 is formed by splicing two semi-arc sieve plates 22, two rollers 4 are symmetrically arranged on both sides of the bottom of each positioning cylinder 3, a motor 5 is arranged at the front end of the box body 1, and a main motor 20 is coaxially fixed on the output shaft of the motor 5. A movable gear 51 is provided, and an outer gear ring 52 which can mesh with the driving gear 51 is arranged on the outer wall of the positioning cylinder 3 above the driving gear 51 in the circumferential direction. A feeding pipe 11 for feeding materials into the screen cylinder 2 is arranged at the front end of the box body 1. The upper end of the feeding pipe 11 is welded and fixed to the front end of the box body 1, and the lower end is bent and inserted into the screen cylinder 2 for feeding. A discharge port 12 is arranged at the bottom of the box body 1, and a dust suction port can also be arranged on the top of the box body 1. By connecting with a dust collector, the dust generated during the screening process of the drum screen is collected and removed by the dust collector. By decomposing the sieve drum into a plurality of sieve drum units 21, and decomposing the sieve drum unit 21 into two half-arc sieve plates 22, the sieve drum only needs to be replaced at the partially damaged part of the sieve drum, and the maintenance cost is low. At the same time, each sieve drum unit 21 is connected by a socket structure, and the sieve drum unit 21 is spliced ​​by two half-arc sieve plates 22, which is convenient for disassembly and installation. The outer gear ring 52 is driven by the motor 5 to rotate the active gear 51, so that the sieve drum 2 can be quickly started and screened. At the same time, different rotation speeds can be quickly matched according to the feed amount of the sieve drum 2 to prevent the sieve drum 2 from being blocked by accumulated materials, and it is convenient to clean the debris on the sieve drum 2. At the same time, by sequentially installing sieve drum units with different sieve holes, rapid grading and screening of large and small grains and grains of various specifications can be achieved, and the screening range is large.

[0028] In this embodiment, see Figure 2 A first annular boss 211 is provided on the front end face of each sieve drum unit 21, and a first annular groove 212 matching the first annular boss 211 is provided on the rear end face. The head and tail ends of two adjacent sieve drum units 21 are connected to each other through the first annular groove 212 and the first annular boss 211 through socket fitting. At the same time, the first annular boss 211 and the first annular groove 212 are radially connected. The first annular boss 211 on each sieve drum unit 21 is connected and fixed to the connected sieve drum unit 21 by bolts 6, so that the two adjacent sieve drum units 21 cannot rotate relative to each other.

[0029] In this embodiment, see Figure 2 , 3, each of the sieve plates 22 is provided with a first connecting block 23 on the upper side wall and a second connecting block 24 on the lower side wall, a plurality of first guide holes 231 are provided on the docking surface of the first connecting block 23, a plurality of guide posts 241 are provided on the docking surface of the second connecting block 24, a positioning hole 242 is radially provided on the side wall of the guide post 241, a mounting hole 232 is radially provided in the middle of the first guide hole 231, a second guide hole 233 penetrating the outer side wall of the first connecting block 23 is provided at the bottom of the mounting hole 232, a guide shaft 234 which can cooperate with the second guide hole 233 is penetrated in the second guide hole 233 and the mounting hole 232, a limiting boss 235 is provided at the outer end of the guide shaft 234, and the guide shaft 234 is located at the mounting hole A compression spring 243 is coaxially sleeved on the side wall inside 232, one end of the compression spring 243 is elastically fixedly connected to the bottom of the mounting hole 232, and the other end is elastically fixedly connected to the positioning boss 236 arranged on the outer wall of the guide shaft 234. When it is necessary to separate the two sieve plates 22 spliced ​​together, just pull up the guide shaft 234, the guide shaft 234 leaves the positioning hole 242, the guide column 241 can be moved out of the first guide hole 231, so that the two connected sieve plates 22 are separated. When it is necessary to connect the two sieve plates 22 to be spliced, insert the guide column 241 into the first guide hole 231, and then drive the guide column 241 and the compression spring 243 to enter the positioning hole 242, so that the guide column 241 can be fixedly connected to the first guide hole 231.

[0030] In this embodiment, see Figure 1 , 2 An annular track 31 is sleeved on the outer wall of each positioning cylinder 3, and an annular guide groove 311 is provided on the outer wall of the annular track 31. The roller part of the roller 4 extends into the annular guide groove 311 for guiding and cooperation. During the rotation of the positioning cylinder 3, the roller of the roller 4 rolls and rotates in the annular guide groove 311 to support the rotation of the positioning cylinder 3, thereby preventing the screen drum 2 from moving along the axial direction.

[0031] In this embodiment, see Figure 2 A second annular boss 32 is provided on the end face of the positioning cylinder 3 at the front end of the box body 1, and is socket-fitted with a first annular groove 212 provided on the end face of the corresponding sieve drum unit 21. A second annular groove 33 is provided on the end face of the positioning cylinder 3 at the rear end of the box body 1, and is socket-fitted with a first annular boss 211 provided on the end face of the corresponding sieve drum unit 21. The first annular boss 211 on the sieve drum unit 21 is connected and fixed to the positioning cylinder 3 at the rear end of the box body 1 by bolts 6. The second annular boss 32 of the positioning cylinder 3 at the front end of the box body 1 is connected to the connected sieve drum unit 21 by bolts 6 to prevent relative displacement between the positioning cylinder 3 and the sieve drum 2.

[0032] In this embodiment, see Figure 2A plurality of spirally distributed guide bosses 30 are arranged on the inner walls of the screen drum 2 and the two positioning cylinders 3. The materials can be moved backwards for screening through the guide bosses 30 when the screen drum 2 rotates, driven by the spiral bosses.

[0033] In this embodiment, the diameter of the sieve holes of the sieve drum 2 from the front end to the rear end in the box body 1 is set to gradually increase so as to achieve rapid screening of large impurities, small impurities, and grains of different specifications. Correspondingly, a receiving trough is placed at the sieve drum unit 21 with different sieve holes corresponding to the discharge port 12 to separate the screened impurities from the material.

[0034] It can be seen from the above technical scheme that when in use, first add the material to be screened from the feeding pipe into the screen drum 2, control the motor 5 through the controller to drive the driving gear 51 to rotate, the driving gear 51 and the outer gear ring 52 are meshed with each other for transmission, and the screen drum 2 is driven to rotate. The material in the screen drum 2 is screened from front to back along the inner wall of the screen drum 2 under the drive of the spirally distributed guide boss 30. When disassembling, support the bottom of the screen drum 2 so that the annular guide groove 311 on the positioning cylinder 3 is higher than the roller 4, and then loosen the first annular boss 211 on the screen drum unit 21 and the bolt 6 on the positioning cylinder 3 at the rear end of the box body 1 connected thereto, and remove the rear end of the box body 1. Position the cylinder 3, loosen the bolt 6 of the second annular boss 32 of the positioning cylinder 3 at the front end of the box body 1 and the connected sieve drum unit 21, remove the positioning cylinder 3 at the rear end of the box body 1, loosen the bolt 6 of the first annular boss 211 on each sieve drum unit 21 and the connected sieve drum unit 21, then fix one sieve drum unit 21 along the axial direction, move the other sieve drum unit 21, disassemble each sieve drum unit 21, and then lift the guide shaft 234. The guide column 234 shortens the compression spring, and the guide shaft 234 leaves the positioning hole 242. The guide column 241 can be moved out of the first guide hole 231 to separate the two connected sieve plates 22.

[0035] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. The present invention is intended to cover any variation, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope of the present invention is indicated by the claims.

[0036] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A cylindrical primary screening machine for grains, characterized in that: The invention comprises a box body (1), a screen drum (2) is arranged in the box body (1), two positioning cylinder bodies (3) are arranged at both ends of the screen drum (2), the screen drum (2) comprises a plurality of coaxially arranged screen drum units (21), two adjacent screen drum units (21) are connected end to end, each screen drum unit (21) is formed by splicing two semi-arc screen plates (22), two rollers (4) are symmetrically arranged on both sides of the bottom of each positioning cylinder body (3), a motor (5) is arranged at the front end of the box body (1), a driving gear (51) is coaxially fixed on the output shaft of the motor (5), an outer gear ring (52) which can mesh with the driving gear (51) is arranged on the outer wall of the positioning cylinder body (3) above the driving gear (51) along the circumferential direction, a feeding pipe (11) for feeding materials into the screen drum (2) is arranged at the front end of the box body (1), and a discharge port (12) is arranged at the bottom of the box body (1).

2. A cylindrical primary screening machine for grains according to claim 1, characterized in that: A first annular boss (211) is arranged on the front end face of each sieve drum unit (21), and a first annular groove (212) matching the first annular boss (211) is arranged on the rear end face; the head and tail ends of two adjacent sieve drum units (21) are connected to the first annular boss (211) by means of a socket-fitting connection via the first annular groove (212) and the first annular boss (211).

3. The cylindrical primary screening machine for grains according to claim 1, characterized in that: A first connecting block (23) is arranged on the upper side wall of each sieve plate (22), and a second connecting block (24) is arranged on the lower side wall; a plurality of first guide holes (231) are arranged on the docking surface of the first connecting block (23); a plurality of guide columns (241) are arranged on the docking surface of the second connecting block (24); positioning holes (242) are arranged radially on the side walls of the guide columns (241); a mounting hole (232) is arranged radially in the middle of the first guide hole (231); a second guide hole (242) penetrating through the outer side wall of the first connecting block (23) is arranged on the inner bottom of the mounting hole (232); A guide shaft (234) is provided in the second guide hole (233) and the mounting hole (232) and can be guided and matched with the second guide hole (233). A limiting boss (235) is provided at the outer end of the guide shaft (234). A compression spring (243) is coaxially sleeved on the side wall of the guide shaft (234) located in the mounting hole (232). One end of the compression spring (243) is elastically fixedly connected to the bottom of the mounting hole (232), and the other end is elastically fixedly connected to the positioning boss (236) provided on the outer wall of the guide shaft (234).

4. The cylindrical primary screening machine for grains according to claim 1, characterized in that: An annular track (31) is sleeved on the outer wall of each positioning cylinder (3), and an annular guide groove (311) is provided on the outer wall of the annular track (31), and the roller part of the roller (4) extends into the annular guide groove (311) for guiding and matching.

5. The cylindrical primary screening machine for grains according to claim 1, characterized in that: A second annular boss (32) is provided on the end face of the positioning cylinder (3) at the front end of the box body (1) and is connected to a first annular groove (212) provided on the end face of the corresponding screen drum unit (21) in a socket-fitting manner; a second annular groove (33) is provided on the end face of the positioning cylinder (3) at the rear end of the box body (1) and is connected to a first annular boss (211) provided on the end face of the corresponding screen drum unit (21) in a socket-fitting manner.

6. The cylindrical primary screening machine for grains according to claim 1, characterized in that: The inner walls of the screen cylinder (2) and the two positioning cylinders (3) are provided with a plurality of spirally distributed guide bosses (30).

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