Dry grinding machine with dust collection function

Abstract

The utility model relates to the technical field of material grinding, in particular to a dry grinder with a dust collection function. Comprising a grinding machine body, a wind power sorting machine is fixedly installed on the upper side wall of the grinding machine body, and a cloth bag dust remover is arranged on one side of the wind power sorting machine through a discharging pipe. According to the utility model, in the process that the rotary feeder discharges powder raw materials in the hopper at a constant speed, the main shaft drives the scraper assembly to rotate, so that a brush plate in the scraper assembly does reciprocating motion along the conical inclined plane direction of the hopper while rotating around the axis of the main shaft; the rotating brush plate brushes off the powder raw materials adhered to the conical inner wall of the hopper, and the reciprocating brush plate vibrates off the powder raw materials transferred to the brush plate, so that the powder raw materials in the hopper can fall into the rotary feeder under the action of gravity; the rotary feeder can completely convey out the powder raw materials in the hopper, and blockage caused by accumulation of the powder raw materials in the hopper is avoided.

Description

Technical Field

[0001] This utility model relates to the field of material grinding technology, and more specifically, to a dry grinding machine with dust collection function. Background Technology

[0002] Vertical roller mills are typically used in the industrial production of ultrafine powders. These mills are used for grinding and screening ultrafine powders. After grinding granular raw materials into powder, the powder contains small, inhalable particles. During subsequent processing, these inhalable particles can easily escape into the air and be inhaled by workers, thus endangering their health. To avoid this problem, existing technologies typically install dust collectors on the mill's discharge pipe to collect these inhalable particles.

[0003] One type of dust collector in the prior art has a structure similar to that of a baghouse dust collector. After filtering out the inhalable powder from the powder material through the filter bag, the powder material accumulates inside the dust collector's hopper. Because the powder particles are small and the inner wall of the hopper cannot be completely smooth, some powder material tends to adhere to the inner wall of the hopper. If the powder material adhering to the inner wall of the hopper is not cleaned in time, it will increase the roughness of the inner wall of the hopper, resulting in more powder material adhering to the inner wall of the hopper, increasing the risk of hopper blockage, and causing the dust collector to malfunction. Since the inside of the hopper is usually a closed space, workers can only clean the inner wall of the hopper by disassembling the hopper. The process of disassembling and cleaning the hopper consumes a lot of time and energy. At the same time, the dust collector cannot be used after the hopper is disassembled, which affects the grinding efficiency of the grinder on the powder material. Utility Model Content

[0004] The purpose of this invention is to provide a dry grinding machine with a dust collection function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model aims to provide a dry grinder with a dust collection function, comprising a grinder body, an air separator fixedly installed on the upper side wall of the grinder body, a bag filter dust collector installed on one side of the air separator through a discharge pipe, the bag filter dust collector including a housing fixed and connected to the discharge pipe, a hopper in the shape of an inverted cone fixedly installed at the bottom of the housing, a cleaning mechanism installed inside the hopper, the cleaning mechanism including a main shaft coaxially rotatably installed inside the hopper, two scraper assemblies symmetrically arranged on the circumferential side wall of the main shaft, the scraper assembly including a brush plate that slides in contact with the inner wall of the cone of the hopper, when the main shaft drives the scraper assembly to rotate, the brush plate brushes off the powder adhering to the inner wall of the hopper, the brush plate moves up and down along the inclined plane of the cone of the hopper while rotating.

[0006] As a further improvement to this technical solution, the cleaning mechanism also includes a positioning ring coaxially fixed to the top of the inner wall of the hopper. A three-pronged rod is fixed to the inner circumference of the positioning ring. The main shaft rotates through the middle position of the three-pronged rod. A motor for driving the main shaft to rotate is installed on the top of the housing.

[0007] As a further improvement to this technical solution, the scraper assembly also includes a mounting bracket, which includes an inclined rod fixedly disposed at the lower end of the main shaft and extending obliquely upward. A horizontal bar is fixedly disposed between the upper end of the inclined rod and the circumferential side wall of the main shaft. A guide groove is provided on the side of the inclined rod away from the main shaft, and the brush plate is slidably disposed inside the guide groove on the side of the brush plate close to the main shaft.

[0008] As a further improvement to this technical solution, the scraper assembly also includes a sealing cover fixedly disposed on the side of the inclined rod near the main shaft. The inclined rod has a movable groove communicating with the inside of the sealing cover. A T-shaped slider fixed to the brush plate is slidably disposed inside the movable groove. One end of the T-shaped slider extends into the inside of the sealing cover. Springs are fixedly disposed between both sides of one end of the T-shaped slider and the inner wall of the sealing cover. The springs are used to limit the position of the T-shaped slider inside the sealing cover and make it tend to return to the initial position.

[0009] As a further improvement to this technical solution, the lower sidewall of the positioning ring is provided with a number of arc-shaped grooves in an annular array. The arc-shaped grooves are connected end to end to form a wave shape. The upper sidewall of the brush plate is fixed with a stop rod. When the brush plate rotates around the main shaft axis, the upper end of the stop rod slides in contact with the inner wall of the arc-shaped grooves respectively.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This dry grinding mill with dust collection function, during the process of the rotary feeder uniformly discharging the powder material inside the hopper, causes the main shaft to drive the scraper assembly to rotate. This causes the brush plates in the scraper assembly to rotate around the main shaft axis and reciprocate along the inclined surface of the hopper cone. The rotating brush plates brush off the powder material adhering to the inner wall of the hopper cone, and the reciprocating brush plates shake off the powder material transferred to themselves. This ensures that the powder material inside the hopper can fall into the rotary feeder under the action of gravity. The rotary feeder can completely transport the powder material inside the hopper and avoid blockage caused by the accumulation of powder material inside the hopper. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the main body of the grinding machine of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the bag filter dust collector of this utility model;

[0015] Figure 4 This is a cross-sectional view of the bag filter dust collector of this utility model;

[0016] Figure 5 This is a schematic diagram of the cleaning mechanism of this utility model;

[0017] Figure 6 This is a schematic diagram of the scraper assembly of this utility model;

[0018] Figure 7 This is one of the exploded views of the scraper assembly of this utility model;

[0019] Figure 8 This is the second exploded view of the scraper assembly of this utility model.

[0020] The meanings of the labels in the diagram are as follows:

[0021] 1. Grinding mill body; 11. Air separator; 12. Discharge pipe;

[0022] 2. Baghouse dust collector; 21. Shell; 211. Partition; 22. Hopper; 23. Rotary feeder; 24. Fine feed pipe;

[0023] 25. Cleaning mechanism; 251. Main shaft; 252. Motor; 253. Positioning ring; 254. Arc groove;

[0024] 255. Scraper assembly; 2551. Mounting bracket; 2552. Guide groove; 2553. Brush plate; 2554. Push rod; 2555. Sealing cover; 2556. T-slider; 2557. Spring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] Please see Figure 1 and Figure 2As shown, one of the objectives of this embodiment is to provide a dry grinder with a dust collection function, including a grinder body 1. The grinder body 1 is a commercially available vertical drum grinder. The grinder body 1 has a rotatable grinding disc and a roller assembly that cooperates with the grinding disc. A screw conveyor is installed on one side of the grinder body 1. When the screw conveyor transports granular raw materials into the grinder body 1, the grinding disc and roller assembly cooperate to grind the raw materials into powder. A wind separator 11 is fixedly installed on the upper side wall of the grinder body 1. The wind separator 11 is also a commercially available wind separator. After the powdered raw materials ground by the grinder body 1 enter its own interior, the wind separator 11 sorts the powdered raw materials according to particle size. The larger powdered raw materials are fed back into the grinding disc of the grinder body 1 by the wind separator 11 for grinding, thereby ensuring that the raw materials entering the grinder body 1 can be ground into standard particle sizes.

[0028] Meanwhile, a bag filter 2 is installed on one side of the wind separator 11 via a discharge pipe 12. The wind separator 11 will transport the smaller powder raw materials it separates to the bag filter 2 through the discharge pipe 12. Then, the bag filter 2 will filter out and collect the inhalable dust in the powder raw materials to prevent the dust from escaping into the air during subsequent processes and being inhaled by workers, thus endangering their health. The structure of the bag filter 2 is described in detail below, referring to... Figure 3 and Figure 4The baghouse dust collector 2 includes a housing 21 fixed and connected to the discharge pipe 12. A cone-shaped hopper 22 is fixedly installed at the bottom of the housing 21. A commercially available rotary feeder 23 is fixedly installed at the lower end of the hopper 22. A partition 211 is horizontally fixed inside the housing 21 near the top. Several upward-facing perforated cylinders are fixed on the partition 211, connecting the space below and above the partition 211 inside the housing 21. A filter bag is fitted and fixed to the outside of the perforated cylinders below the partition 211. The discharge pipe 12 connects to the housing 21 below the partition 211. A fine material pipe 24 is fixedly connected to one side of the housing 21 above the partition 211. The other end of the fine material pipe 24 is connected to a dust treatment device. When the wind separator 11 transports the powder raw material into the discharge pipe 12 by wind power, the discharge pipe 12 transports the airflow mixed with the powder raw material. After entering the housing 21, the airflow is blocked from exiting through the lower end of the hopper 22 by the rotary feeder 23. Therefore, the airflow can only be discharged outward by passing through the gaps in the cloth bag, the hollow cylinder, and the fine material tube 24 in sequence. During this process, the cloth bag filters the powder raw material. The inhalable dust in the powder raw material enters the interior of the hollow cylinder through the gaps in the cloth bag, and then enters the space above the partition 211 inside the housing 21. It is then discharged into the dust treatment equipment for treatment through the fine material tube 24. The inhalable dust is particulate matter with an aerodynamic diameter of less than or equal to 15 micrometers. After being inhaled by the human body, it will enter the alveoli and harm the health. The end products in the powder raw material that meet the predetermined particle size cannot pass through the gaps in the cloth bag. A small portion of the end products adhere to the outer wall of the cloth bag, while most of the end products will fall into the interior of the hopper 22 under the action of gravity due to the attenuation of the airflow velocity. They are then transported to the outside of the hopper 22 by the rotary feeder 23 for collection.

[0029] When the powdered raw materials destined for the final product accumulate inside the hopper 22, if the roughness of the conical inner wall of the hopper 22 is high, some of the powdered raw materials will adhere to the conical inner wall of the hopper 22, easily causing blockage of the narrow outlet at the lower end of the hopper 22. To solve this problem, a cleaning mechanism 25 is provided inside the hopper 22. The cleaning mechanism 25 is used to scrape off the powdered raw materials adhering to the conical inner wall of the hopper 22. The structure of the cleaning mechanism 25 is detailed below, refer to... Figure 5The cleaning mechanism 25 includes a main shaft 251 coaxially rotatably disposed inside the hopper 22. Two scraper assemblies 255 are symmetrically arranged on the circumferential sidewall of the main shaft 251. Each scraper assembly 255 includes a brush plate 2553 that slides in contact with the conical inner wall of the hopper 22. The brush plate 2553 is a long strip with flocked side, and the other sides of the brush plate 2553 are smooth surfaces. The flocked side of the brush plate 2553 contacts the conical inner wall of the hopper 22. When the main shaft 251 drives the scraper assembly 255 to rotate, the brush plate 2553 cleans the powder adhering to the inner wall of the hopper 22. The material is brushed off. When the brush plate 2553 rotates around the axis of the main shaft 251, the cleaning mechanism 25 drives the brush plate 2553 to move up and down along the conical inclined surface of the hopper 22. That is, the brush plate 2553 moves up and down along the conical inclined surface of the hopper 22 while rotating. When the powder adhering to the inner wall of the hopper 22 is transferred to the brush plate 2553, the reciprocating movement of the brush plate 2553 can shake off the powder material, preventing the powder material from adhering to the brush plate 2553, thereby ensuring the cleaning quality of the inner wall of the hopper 22 by the brush plate 2553.

[0030] To enable the main shaft 251 to drive the brush plate 2553 to rotate, the cleaning mechanism 25 also includes a positioning ring 253 coaxially fixed to the top of the inner wall of the hopper 22. A three-pronged rod is fixed to the inner circumference of the positioning ring 253. The main shaft 251 rotates through the middle position of the three-pronged rod, which limits the main shaft 251 and improves the stability of the main shaft 251 during rotation. At the same time, a motor 252 that drives the main shaft 251 to rotate is installed on the top of the housing 21. The output shaft of the motor 252 rotates through the upper side wall of the housing 21 and is coaxially fixed to the upper end of the main shaft 251 through a coupling. When the output shaft of the motor 252 drives the main shaft 251 to rotate, the main shaft 251 drives the scraper assembly 255 to rotate around the axis of the main shaft 251, thereby driving the brush plate 2553 in the scraper assembly 255 to rotate synchronously.

[0031] In order for the brush plate 2553 to reciprocate along the conical inclined plane of the hopper 22 while rotating, refer to Figures 6-8The scraper assembly 255 also includes a mounting bracket 2551. The mounting bracket 2551 includes an inclined rod fixedly disposed at the lower end of the main shaft 251 and extending obliquely upward. A horizontal bar is horizontally fixed between the upper end of the inclined rod and the circumferential side wall of the main shaft 251. The inclined rod, the horizontal bar, and the main shaft 251 form a right triangle. A guide groove 2552 is provided on the side of the inclined rod away from the main shaft 251. The brush plate 2553 is slidably disposed inside the guide groove 2552 on the side of the brush plate 2553 near the main shaft 251. The opening direction of the guide groove 2552 of the brush plate 2553 is parallel to the direction of the conical inclined surface of the hopper 22. The guide groove 2552 restricts the brush plate 2553 to move only along the direction of the conical inclined surface of the hopper 22. The scraper assembly 255 also includes a mounting bracket fixedly disposed on the inclined rod near the main shaft 251. One side of the sealing cover 2555 has a movable groove on the inclined rod that communicates with the interior of the sealing cover 2555. A T-shaped slider 2556, fixed to the brush plate 2553, is slidably mounted inside the movable groove. One end of the T-shaped slider 2556 extends into the interior of the sealing cover 2555. The T-shaped slider 2556 and the movable groove cooperate to restrict the brush plate 2553 from moving out of the guide groove 2552, improving the stability of the brush plate 2553 sliding on one side of the inclined rod. Springs 2557 are fixedly mounted on both sides of one end of the T-shaped slider 2556 and between the T-shaped slider 2556 and the inner wall of the sealing cover 2555. The two springs 2557 push the T-shaped slider 2556 to the middle position of the sealing cover 2555. The springs 2557 are used to restrict the T-shaped slider 2556 within the sealed cover 2555. The sealing cover 2555 is positioned inside the cover and tends to return to its initial position. That is, if the two springs 2557 restrict the T-shaped slider 2556 to the middle position inside the sealing cover 2555, then after the T-shaped slider 2556 moves under external force, once the external force is removed, the springs 2557 will push the T-shaped slider 2556 back to the middle position inside the sealing cover 2555. The sealing cover 2555 prevents powder material from adhering to the springs 2557 to ensure that the springs 2557 can undergo normal elastic deformation. Simultaneously, several arc-shaped grooves 254 are arranged in a circular array on the lower side wall of the positioning ring 253. These arc-shaped grooves 254 are connected end-to-end to form a wave shape. The upper side wall of the brush plate 2553 is fixed with... The abutment rod 2554 has a ball head at its upper end, which contacts the side wall of the arc-shaped groove 254. When the brush plate 2553 rotates around the axis of the main shaft 251, the upper end of the abutment rod 2554 slides in contact with the inner walls of several arc-shaped grooves 254. When the upper end of the abutment rod 2554 slides from the high point to the low point of the arc-shaped groove 254, the arc-shaped groove 254 pushes the abutment rod 2554 and the brush plate 2553 downward. The brush plate 2553 drives the T-shaped slider 2556 to move synchronously, causing the spring 2557 between the lower side wall of the T-shaped slider 2556 and the sealing cover 2555 to elastically contract, and another spring 2557 to elastically stretch. When the upper end of the abutment rod 2554 slides from the low point to the high point of the arc-shaped groove 254...After elastic contraction, the spring 2557 rebounds, lifting the T-shaped slider 2556 and the brush plate 2553 upwards. After elastic stretching, the spring 2557 rebounds, simultaneously pulling the T-shaped slider 2556 and the brush plate 2553 upwards until the T-shaped slider 2556 returns to its initial position. This causes the brush plate 2553 to rotate around the axis of the main shaft 251 while reciprocating along the conical inclined surface of the hopper 22, shaking off the powder material transferred to the brush plate 2553. This ensures that all the powder material inside the hopper 22 falls into the rotary feeder 23 under gravity, allowing the rotary feeder 23 to completely convey the powder material from the hopper 22.

[0032] In this grinding mill, when the scraper assembly 255 cleans the conical inner wall of the hopper 22, the output shaft of the motor 252 drives the main shaft 251 to rotate. The main shaft 251 drives the two scraper assemblies 255 to rotate synchronously around the axis of the main shaft 251. The mounting bracket 2551 in the scraper assembly 255 drives the brush plate 2553 to rotate around the axis of the main shaft 251. The rotating brush plate 2553 brushes off the powder adhering to the inner wall of the hopper 22. Some of the powder brushed off by the brush plate 2553 falls into the interior of the rotary feeder 23 under the action of gravity, and some is transferred to the surface of the brush plate 2553. When the brush plate 2553 rotates around the axis of the main shaft 251, the upper end of the push rod 2554 slides into contact with the inner wall of several arc-shaped grooves 254. The spring 2557 repeatedly drives the brush plate 2553 back to the initial state, so that the brush plate 2553 moves back and forth along the direction of the conical inclined surface of the hopper 22 while rotating around the axis of the main shaft 251. The powder material transferred to the brush plate 2553 is shaken off into the interior of the rotary feeder 23, so as to prevent the dust on the brush plate 2553 from contacting and transferring to the conical inner wall of the hopper 22 again, thereby completing the cleaning of the conical inner wall of the hopper 22.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dry grinding mill with dust collection function, comprising a grinding mill body (1), wherein a wind separator (11) is fixedly installed on the upper side wall of the grinding mill body (1), and a bag filter (2) is provided on one side of the wind separator (11) through a discharge pipe (12), wherein the bag filter (2) includes a housing (21) fixed and communicating with the discharge pipe (12), and a hopper (22) in the shape of an inverted cone is fixedly provided at the bottom of the housing (21), characterized in that: The hopper (22) is equipped with a cleaning mechanism (25). The cleaning mechanism (25) includes a main shaft (251) that is coaxially rotatably disposed inside the hopper (22). Two scraper assemblies (255) are symmetrically disposed on the circumferential sidewall of the main shaft (251). The scraper assembly (255) includes a brush plate (2553) that slides in contact with the conical inner wall of the hopper (22). When the main shaft (251) drives the scraper assembly (255) to rotate, the brush plate (2553) brushes away the powder adhering to the inner wall of the hopper (22). The brush plate (2553) moves up and down along the conical inclined surface of the hopper (22) while rotating.

2. The dry grinding mill with dust collection function according to claim 1, characterized in that: The cleaning mechanism (25) also includes a positioning ring (253) coaxially fixed to the top of the inner wall of the hopper (22). A three-pronged rod is fixed to the inner circumference of the positioning ring (253). The main shaft (251) rotates through the middle position of the three-pronged rod. A motor (252) that drives the main shaft (251) to rotate is installed on the top of the housing (21).

3. The dry grinding mill with dust collection function according to claim 1, characterized in that: The scraper assembly (255) also includes a mounting bracket (2551), which includes a diagonal bar fixedly disposed at the lower end of the main shaft (251) and extending obliquely upward. A horizontal bar is fixedly disposed between the upper end of the diagonal bar and the circumferential side wall of the main shaft (251). A guide groove (2552) is provided on the side of the diagonal bar away from the main shaft (251). The brush plate (2553) is slidably disposed inside the guide groove (2552) on the side of the brush plate (2553) close to the main shaft (251).

4. The dry grinding mill with dust collection function according to claim 3, characterized in that: The scraper assembly (255) also includes a sealing cover (2555) fixedly disposed on the side of the inclined rod near the main shaft (251). The inclined rod has a movable groove communicating with the inside of the sealing cover (2555). A T-shaped slider (2556) fixed on the brush plate (2553) is slidably disposed inside the movable groove. One end of the T-shaped slider (2556) extends into the inside of the sealing cover (2555). Springs (2557) are fixedly disposed on both sides of one end of the T-shaped slider (2556) and between the T-shaped slider (2556) and the inner wall of the sealing cover (2555). The springs (2557) are used to limit the position of the T-shaped slider (2556) inside the sealing cover (2555) and make it tend to return to the initial position.

5. The dry grinding mill with dust collection function according to claim 2, characterized in that: The lower sidewall of the positioning ring (253) is provided with a number of arc-shaped grooves (254) arranged in an annular array. The arc-shaped grooves (254) are connected end to end to form a wave shape. The upper sidewall of the brush plate (2553) is fixed with a push rod (2554). When the brush plate (2553) rotates around the axis of the main shaft (251), the upper end of the push rod (2554) slides in contact with the inner wall of the arc-shaped grooves (254).

Images