A self-cleaning mechanism for a color sorter conveyor belt

Abstract

This invention discloses a self-cleaning mechanism for a color sorter conveyor belt, belonging to the field of color sorter auxiliary devices. The invention includes a first cleaning mechanism and a second cleaning mechanism respectively disposed on the upper and lower sides of the conveyor belt. The first cleaning mechanism includes a negative pressure hood (first type) installed below the conveyor belt, with a scraper structure inside. The second cleaning mechanism includes a negative pressure hood (second type) installed above the conveyor belt, with a brush structure inside. Both negative pressure hoods are connected to a negative pressure device. By providing brushes and scrapers equipped with negative pressure hoods on the upper and lower sides of the conveyor belt, when the brush rollers rotate to clean the bottom of the conveyor belt, the generated dust and debris are completely enclosed within the negative pressure hood (second type) and rapidly sucked away by the negative pressure airflow, effectively preventing them from escaping upwards or outwards. Simultaneously, large particles scraped off by the scraper are directly captured by the suction of the negative pressure hood (first type).

Description

Technical Field

[0001] This invention relates to the field of color sorter accessories, and particularly to a self-cleaning mechanism for a color sorter conveyor belt. Background Technology

[0002] A color sorter is an automated sorting device that uses photoelectric detection technology to identify the color of granular materials such as rice, grains, tea, and nuts, and uses high-speed airflow to remove discolored particles or impurities. In the color sorter's workflow, materials are typically carried and transported to the sorting area by a high-speed conveyor belt. During this process, dust and debris generated by the materials themselves, or impurities from the external environment, continuously adhere to and accumulate on the surface of the conveyor belt.

[0003] In existing technologies, conveyor belt cleaning typically involves installing brushes on the downward-facing side of the conveyor belt to remove dust, debris, and other impurities adhering to it. During cleaning, the brushes rotate at high speed, causing the dust and debris to fly off. Current solutions usually use traditional negative pressure hoods to collect these scattered impurities. Since the dust usually rises after being dispersed, in actual operation, lightweight dust such as rice bran and tea dust that are brushed up is swept out of the hood by the airflow before it can be sucked away, resulting in secondary pollution caused by the dust flying off while being brushed. Summary of the Invention

[0004] This invention provides a self-cleaning mechanism for the conveyor belt of a color sorter, which can solve the problem of secondary pollution caused by brushing and flying during operation in the prior art.

[0005] A self-cleaning mechanism for a color sorter conveyor belt includes a first cleaning mechanism and a second cleaning mechanism respectively disposed on the upper and lower sides of the conveyor belt; the first cleaning mechanism includes a negative pressure hood 1 installed below the conveyor belt, and a scraper structure is disposed inside the negative pressure hood 1; the second cleaning mechanism includes a negative pressure hood 2 installed above the conveyor belt, and a brush structure is disposed inside the negative pressure hood 2; both the negative pressure hood 1 and the negative pressure hood 2 are connected to a negative pressure device.

[0006] Furthermore, it also includes a filter box one and a filter box two; the top of the filter box two is connected to the bottom of the filter box one, and the top of the filter box one is connected to the negative pressure cover one and the negative pressure cover two respectively through two sets of pipes, and the negative pressure device is connected to the bottom of the filter box two; the filter box one and the filter box two are respectively provided with filter screen assembly one and filter screen assembly two, and the filter pore size of the filter screen assembly one is larger than the filter pore size of the filter screen assembly two.

[0007] Furthermore, the filter box one and filter box two have the same structure, both including a square box body. An opening is provided on one side of the box body, and an inspection door is sealed and installed at the opening by a bolt. An air inlet and an exhaust outlet are respectively opened at the top and bottom of the box body. The filter screen assembly one and filter screen assembly two are both sealed and installed at the air inlet on the top side of the box body.

[0008] Furthermore, the filter assembly one and filter assembly two have the same structure, both including a cylindrical body with a flanged top; the peripheral wall of the cylindrical body has several through holes, and a filter is fixed on the inner or outer peripheral side of the cylindrical body.

[0009] Furthermore, a connection structure is provided on the top side of the housing located at the air inlet, which is sealed to the flange. The connection structure includes a tube, a limiting protrusion ring is provided on the outer peripheral side wall of the bottom end of the tube, an annular sealing groove is provided on the upper surface of the limiting protrusion ring, and an annular sealing ring is provided in the annular sealing groove. A movable ring is sleeved on the outer side of the tube, and a stepped groove that cooperates with the limiting protrusion ring is provided on the inner ring of one side of the movable ring. The movable ring and the flange are connected by a bolt. An annular sealing groove is provided on the upper surface of the flange, and an annular sealing ring is provided in the annular sealing groove.

[0010] Furthermore, a positioning structure is provided on the bottom side of the box body. The positioning structure includes a pair of symmetrically arranged positioning plates. A guide portion is provided at one end of the positioning plate. One end of the two positioning plates forms a positioning channel. A positioning plate is provided at the end of the positioning channel. The exhaust port is provided on the bottom side of the box body on one side of the positioning structure.

[0011] Furthermore, the scraper structure includes an inclined scraper assembly, with both ends of the scraper assembly fixed to the inner wall of the negative pressure cover; the scraper assembly includes a sleeve fixed to the inner wall of the negative pressure cover and a scraper body inserted into the sleeve, with a spring connecting the sleeve and the scraper body.

[0012] Furthermore, the brush structure includes a brush roller, the two ends of which are mounted on opposite inner walls of the negative pressure shroud 2 via bearing seats; one end of the brush roller extends through to the outside of the negative pressure shroud 2 and is equipped with a gear, which is connected to the drive roller of the conveyor belt via a chain.

[0013] Furthermore, inside the negative pressure shroud, adjustable chip baffles are respectively provided on the front and rear sides of the brush roller along the running direction of the conveyor belt, and the chip baffles maintain a set gap with the tips of the brush bristles of the brush roller.

[0014] Furthermore, the self-cleaning mechanism is applied in color sorters for color sorting rice, grains, tea, or nuts.

[0015] 1. This invention provides brushes and scrapers equipped with negative pressure covers on the upper and lower sides of the conveyor belt. When the brush rollers rotate to clean the area above the conveyor belt, the dust and debris generated are completely enclosed in the second negative pressure cover and quickly sucked away by the negative pressure airflow, effectively preventing them from escaping upwards and outwards. At the same time, large particles scraped off by the scraper are also directly captured by the suction of the first negative pressure cover. 2. The present invention employs a series of filter boxes one and two, each equipped with filter screen components with different pore sizes; this design allows the dust-laden airflow to first pass through the first stage of filtration with larger pores, intercepting most of the larger particles and debris, and then pass through the second stage of filtration with finer pores to capture fine dust. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the self-cleaning mechanism in its installation state provided by the present invention; Figure 2 Provided by the present invention Figure 1 The main view; Figure 3 Provided by the present invention Figure 2 Sectional view at point AA; Figure 4 Provided by the present invention Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the positioning structure provided by the present invention. Explanation of reference numerals in the attached figures: 1-Conveyor belt, 2-First cleaning mechanism, 3-Second cleaning mechanism, 4-Filter box one, 5-Filter box two, 20-Negative pressure hood one, 21-Scraper assembly, 30-Negative pressure hood two, 31-Brush roller, 40-Box body, 41-Filter screen assembly one, 51-Filter screen assembly two, 211-Sleeve, 212-Scraper body, 311-Gear, 402-Bolt one, 403-Inspection door, 404-Air inlet, 405-Exhaust port, 510-Cylinder body, 511-Flanged edge, 512-Through hole, annular sealing groove two, 513-Filter screen, annular sealing ring two, 52-Pipe body, 53-Moving ring, 54-Positioning plate one, 55-Positioning plate two, 521-Limiting protrusion ring, 522-Annular sealing groove one, 523-Annular sealing ring one, 531-Step groove, 532-Bolt two. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0018] like Figures 1 to 5As shown in the embodiment of the present invention, a self-cleaning mechanism for a color sorter conveyor belt is provided. This self-cleaning mechanism is installed at the conveyor belt conveying station of a rice color sorter. To solve the problems of dust dispersion and collection difficulties in the prior art, it specifically includes a first cleaning mechanism 2 and a second cleaning mechanism 3 respectively disposed on the upper and lower sides of the conveyor belt 1. The first cleaning mechanism 2 includes a negative pressure cover 20 installed below the conveyor belt 1. A scraper structure is provided inside the negative pressure cover 20. The scraper structure includes an inclined scraper assembly 21, the two ends of which are respectively fixed to the inner wall surface of the negative pressure cover 20. The scraper assembly 21 consists of a sleeve 211 fixed to the inner wall surface of the negative pressure cover 20, a scraper body 212 inserted into the sleeve 211, and a spring connecting the two. Under the action of the spring, the scraper body 212 can adaptively press against the surface of the conveyor belt, effectively scraping off larger particles or clumps. Meanwhile, the downward suction force generated by the negative pressure hood 20 can immediately suck the dust and debris scraped or raised by the scraper body 212 into the hood; the distance between the negative pressure hood 20 and the surface of the conveyor belt 1 is controlled at 5mm; the scraper body 212 is a PE scraper, and its tilt angle is set to 30° to ensure the scraping effect.

[0019] like Figure 1-2 The second cleaning mechanism 3 includes a negative pressure hood 30 installed above the conveyor belt 1, and a brush structure is provided inside the negative pressure hood 30. Both the negative pressure hood 20 and the negative pressure hood 30 are connected to a negative pressure device. The brush structure includes a brush roller 31, the two ends of which are mounted on the inner wall of the negative pressure hood 30 via bearing seats. One end of the brush roller 31 extends to the outside of the negative pressure hood 30 and is equipped with a gear 311, which is connected to the drive roller of the conveyor belt 1 via a chain. In addition, adjustable chip baffles are provided on the front and rear sides of the brush roller 31 along the running direction of the conveyor belt inside the negative pressure hood 30. The chip baffles maintain a set gap with the tips of the brush bristles of the brush roller 31. When the brush roller rotates at high speed to remove stubborn deposits on the lower surface of the conveyor belt, the generated debris and dust are completely confined within the enclosed space of the negative pressure hood 30. The suction generated by the negative pressure device can quickly remove these impurities, greatly improving collection efficiency and basically eliminating secondary pollution during the cleaning process; the gear 311 is connected to the output shaft of the drive roller of the conveyor belt 1 through a precision transmission chain. By adjusting the chain tension, the rotation speed of the brush roller 31 is synchronized with the running speed of the conveyor belt 1, realizing self-driven cleaning without an additional motor; the adjustable chip baffle further limits the splashing range of debris in the hood, guiding it to be carried away more smoothly by the negative pressure airflow, optimizing the collection path; the conveyor belt 1 is a food-grade belt with anti-slip texture, and the bristles of the brush roller 31 can penetrate deep into the texture of the conveyor belt 1 to brush up rice bran, dust and tiny particles attached to the belt surface.

[0020] To efficiently separate and collect impurities in the airflow and protect the negative pressure device, filter box 4 and filter box 5 are also provided. The top of filter box 25 is connected to the bottom of filter box 4. The top of filter box 4 is connected to negative pressure cover 20 and negative pressure cover 30 respectively through two sets of pipes. The negative pressure device, such as a fan, is connected to the bottom of filter box 25. Filter screen assembly 41 and filter screen assembly 51 are respectively provided in filter box 4 and filter box 25, and the filter hole size of filter screen assembly 41 is larger than that of filter screen assembly 51. Filter box 40 is provided with an inspection door 403 for easy maintenance. The filter screen assembly adopts a cylindrical body 510 structure with a flange 511, and quick sealing installation and disassembly are achieved through a connection structure composed of tube body 52, movable ring 53, sealing ring, etc.

[0021] This invention employs a series-connected two-stage filter box. The dust-laden airflow first enters filter box 4, where filter assembly 41 has larger pores, primarily used to intercept larger particles and debris removed by scrapers and brushes. The pre-filtered airflow then enters the lower filter box 5, where filter assembly 51 has finer pores, used to capture fine dust. This staged filtration method reduces the load on individual filter screens, improving overall filtration efficiency and filter lifespan. Filter assembly 41 uses a stainless steel filter screen with a pore diameter of 2mm, while filter assembly 51 uses a stainless steel filter screen with a pore diameter of 0.5mm. During use, larger particles and debris accumulate inside filter assembly 41 in filter box 4, while fine dust accumulates inside filter assembly 45 in filter box 5.

[0022] Specifically, such as Figure 3-4 To ensure that filter box 4 and filter box 5 have the same structure, both include a square box 40. An opening is provided on one side of the box 40, and an inspection door 403 is installed at the opening by bolt 402. An air inlet 404 and an exhaust outlet 405 are respectively opened at the top and bottom of the box 40. Filter assembly 41 and filter assembly 51 are both sealed and installed at the air inlet 404 on the inner top side of the box 40.

[0023] like Figure 3-4Filter assembly 41 and filter assembly 51 have the same structure, both including a cylindrical body 510 with a flange 511 at the top; the peripheral sidewall of the cylindrical body 510 has several through holes 512, and a filter 513 is fixed on the inner or outer peripheral side of the cylindrical body 510; the inner top side of the housing 40 located at the air inlet 404 is provided with a connection structure that is sealed to the flange 511, the connection structure including a tube 52, and a limiting protrusion ring 521 is provided on the outer peripheral sidewall of the bottom end of the tube 52. The upper surface of the limiting protrusion ring 521 is provided with an annular sealing groove 522, and an annular sealing ring 523 is provided inside the annular sealing groove 522; a movable ring 53 is sleeved on the outside of the pipe body 52, and a stepped groove 531 that mates with the limiting protrusion ring 521 is provided on one side of the inner ring of the movable ring 53; the movable ring 53 and the flange 511 are connected by bolt 532; an annular sealing groove 512 is provided on the upper surface of the flange 511, and an annular sealing ring 513 is provided inside the annular sealing groove 512.

[0024] The disassembly and installation processes for filter assembly 1 (41) and filter assembly 2 (51) are the same, including: During installation, first insert the cylinder 510 into the housing 40 through the opening; align the flange 511 on the top of the cylinder 510 with the bottom of the air inlet 404. The movable ring 53 is controlled to move downward, so that the stepped groove 531 of its inner ring engages with the side of the limiting protrusion 521 of the pipe body 52. ​​The movable ring 53 and the flange 511 are connected and fastened by bolt 2 532. During disassembly, first loosen bolt 2 532, then control the movable ring 53 to move upward so that its bottom side is higher than the upper surface of the flange 511, and then remove the cylinder 510 from the box 40 through the opening.

[0025] To facilitate alignment of the cylinder 510 with the connecting structure after it is placed inside the housing 40, a positioning structure is provided on the bottom side of the housing 40, such as... Figure 5 The positioning structure includes a pair of symmetrically arranged positioning plates 54, with guide portions at the ends of the positioning plates 54. The two positioning plates 54 form a positioning channel, and a second positioning plate 55 is located at the end of the positioning channel. An exhaust port 405 is located on the bottom side of the housing 40 on one side of the positioning structure. The guide portions at the ends of the positioning channel formed by the two positioning plates 54 can guide the outer cylinder 510 to slide into the correct position. The second positioning plate 55 acts as a stop, limiting the sliding stroke of the cylinder 510 in the channel, so that it finally stops at the position precisely aligned with the exhaust port 405 on the bottom side of the housing 40.

[0026] In the above, the positioning structure and the connection structure are designed to facilitate the disassembly and installation of filter assembly 41 and filter assembly 51 according to the needs during use. The disassembly and installation process is for the purpose of centrally emptying and cleaning the impurities accumulated in the corresponding cylinder 510.

[0027] When the self-cleaning mechanism is adapted to the tea color sorter, the scraper body 212 of the scraper assembly 21 is replaced with soft silicone material to avoid scratching the surface of the conveyor belt of the tea color sorter; the filter mesh assembly 1 41 has its filter holes adjusted to 1.5mm to fit the size of tea dust and tea stems; the filter mesh assembly 2 51 has its filter holes adjusted to 0.3mm to accurately capture tea dust; the brush roller 31 has soft nylon bristles to prevent damage to the conveyor belt during brushing, while efficiently cleaning tea dust.

[0028] It is known that the airflow intensity of each negative pressure hood can be flexibly adjusted according to the actual power of the negative pressure device or the type of material on the conveyor belt 1. Adjustable dampers are provided at the air inlets of both negative pressure hood 20 and negative pressure hood 3. When the dust generated by the material is light, reducing the damper opening can reduce energy consumption and the load on the filtration system. When the dust generated by the material is heavy, opening the damper can ensure sufficient suction, thereby achieving optimized control of cleaning effect and operating economy.

[0029] It is known that, in order to effectively remove large particles of impurities while greatly reducing wear on the surface of the conveyor belt 1 and significantly extending the service life of the conveyor belt, a flexible wear-resistant material is added to the contact edge of the scraper body 212. The flexible material can better adapt to the minor unevenness of the conveyor belt surface, ensuring the uniformity and sealing of the scraping.

[0030] To allow for a clear view of the buildup of impurities on filter assembly 41 and filter assembly 51 inside the housing, a transparent observation window is provided on the inspection door 403. Through the observation window, operators can view the contents directly without opening the inspection door 403.

[0031] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A self-cleaning mechanism for a color sorter conveyor belt, characterized in that, It includes a first cleaning mechanism 2 and a second cleaning mechanism 3 respectively disposed on the upper and lower sides of the conveyor belt 1; The first cleaning mechanism 2 includes a negative pressure hood 20 installed below the conveyor belt 1, and a scraper structure is provided inside the negative pressure hood 20; The second cleaning mechanism 3 includes a negative pressure hood 30 installed above the conveyor belt 1, and a brush structure is provided inside the negative pressure hood 30; Both the negative pressure cover 20 and the negative pressure cover 30 are connected to a negative pressure device.

2. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 1, characterized in that, It also includes a filter box 1, 4 and a filter box 2, 5; The top of the second filter box 5 is connected to the bottom of the first filter box 4. The top of the first filter box 4 is connected to the first negative pressure cover 20 and the second negative pressure cover 30 respectively through two sets of pipes. The negative pressure device is connected to the bottom of the second filter box 5. The filter box 4 and the filter box 5 are respectively equipped with filter screen assembly 41 and filter screen assembly 51, and the filter pore size of filter screen assembly 41 is larger than that of filter screen assembly 51.

3. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 2, characterized in that, The filter box 4 and the filter box 5 have the same structure, both including a square box body 40. An opening is provided on one side of the box body 40, and an inspection door 403 is installed at the opening by bolt 402. The top and bottom of the housing 40 are respectively provided with an air inlet 404 and an exhaust outlet 405. The filter assembly 41 and the filter assembly 51 are both sealed and installed at the air inlet 404 on the inner top side of the housing 40.

4. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 3, characterized in that, The filter assembly 41 and the filter assembly 51 have the same structure, both including a cylindrical body 510 with a flange 511 on the top. The cylindrical body 510 has several through holes 512 on its peripheral sidewall, and a filter screen 513 is fixed on the inner or outer peripheral side of the cylindrical body 510.

5. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 4, characterized in that, The inner top side of the housing 40 located at the air inlet 404 is provided with a connection structure that is sealed to the flange 511. The connection structure includes a tube 52. A limiting protrusion ring 521 is provided on the outer peripheral side wall of the bottom end of the tube 52. An annular sealing groove 522 is provided on the upper surface of the limiting protrusion ring 521. An annular sealing ring 523 is provided in the annular sealing groove 522. The outer side of the tube body 52 is fitted with a movable ring 53. The inner ring of one side of the movable ring 53 is provided with a stepped groove 531 that cooperates with the limiting protrusion ring 521. The movable ring 53 and the flange 511 are connected by bolt 2 532. An annular sealing groove 512 is provided on the upper surface of the flange 511, and an annular sealing ring 513 is provided in the annular sealing groove 512.

6. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 5, characterized in that, The bottom side of the housing 40 is provided with a positioning structure, which includes a pair of symmetrically arranged positioning plates 54. The ends of the positioning plates 54 are provided with guides, and the ends of the two positioning plates 54 form a positioning channel. A positioning plate 55 is provided at the end of the positioning channel. The exhaust port 405 is located on the bottom side of the housing 40 on one side of the positioning structure.

7. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 1, characterized in that, The scraper structure includes an inclined scraper assembly 21, with both ends of the scraper assembly 21 fixed to the inner wall surface of the negative pressure cover 20. The scraper assembly 21 includes a sleeve 211 fixed to the inner wall of the negative pressure cover 20, and a scraper body 212 inserted into the sleeve 211. A spring is connected between the sleeve 211 and the scraper body 212.

8. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 1, characterized in that, The brush structure includes a brush roller 31, and the two ends of the brush roller 31 are mounted on the two opposite inner wall surfaces of the negative pressure cover 30 through bearing seats. One end of the brush roller 31 extends through to the outside of the negative pressure cover 30 and is equipped with a gear 311, which is connected to the drive roller of the conveyor belt 1 via a chain.

9. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 8, characterized in that, Inside the negative pressure cover 30, adjustable chip baffles are respectively provided on the front and rear sides of the brush roller 31 along the running direction of the conveyor belt 1. The chip baffles maintain a set gap with the tips of the brush bristles of the brush roller 31.

10. The self-cleaning mechanism for a color sorter conveyor belt as described in claim 8, characterized in that, The self-cleaning mechanism is used in color sorters for color sorting rice, grains, tea, or nuts.

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