Dust collection device for ring die pellet mill
By installing a dual-channel dust collection system on the ring die pellet mill, and utilizing components such as air inlets, suction hoods, dust collectors, and filters, the problem of dust dispersion is solved, achieving efficient dust collection and purification, and improving the cleanliness and safety of the operating environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI MEINONG FEED CO LTD
- Filing Date
- 2025-09-10
- Publication Date
- 2026-08-04
AI Technical Summary
Existing ring die pellet mills lack effective dust collection and treatment measures during cold pelleting, resulting in dust emission, pollution of the production environment, and threats to the health of operators.
The system employs a dual-channel dust collection system, including first and second air inlets, a suction hood, a dust collector, a flow regulating valve, and a dust sensor. Combined with a filter screen and a bag filter, it achieves efficient dust filtration and purification.
It effectively reduces dust pollution, improves the cleanliness of the operating environment, protects the health of operators, and achieves good dust treatment and purification.
Smart Images
Figure CN224585577U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of dust collection in ring die pellet mills, and more particularly to a high-efficiency dust collection device in the cold pelleting process of a ring die pellet mill. Background Technology
[0002] Ring die granulation technology is a technique that uses rotating rollers to compress powdery materials into granules. It is widely used in biomass solidification molding, feed processing, energy and chemical industries.
[0003] During the cold pelleting of materials such as cat litter and biomass using a ring die pellet mill, a large amount of dust is generated due to the extrusion, cutting, and movement of the particles. Currently, existing ring die pellet mills lack effective dust collection and treatment measures, allowing dust to easily escape into the production environment through gaps in the pellet mill door and the discharge port. This large-scale dust escape not only deteriorates the on-site environment, affecting the cleanliness and aesthetics of the production workshop, but also exposes operators to high concentrations of dust for extended periods. Inhaling excessive dust can lead to respiratory diseases and other occupational health problems, seriously threatening the occupational safety and health of personnel.
[0004] In view of the above, the current ring die pellet mill has disadvantages such as dust pollution during the cold pelleting process, which affects the cleanliness of the operating environment and the occupational health of personnel. Utility Model Content
[0005] To address the aforementioned problems, the purpose of this application is to provide a dust collection device for a ring die pellet mill, which can effectively collect and process dust during the cold pelleting process of the ring die pellet mill, thereby reducing dust pollution.
[0006] This application provides a dust collection device for a ring die pellet mill, including a first air inlet and a second air inlet, a suction hood, and a dust collector. The first air inlet is located on the upper side of the machine head, the suction hood is located at the discharge port, the second air inlet is located on the side wall of the suction hood, a flow regulating valve is located at the first air inlet, a dust sensor is installed on the side wall of the machine head, the dust sensor and the flow regulating valve are linked, and the first air inlet and the second air inlet are connected to the inlet of the dust collector through a duct.
[0007] Furthermore, filters are installed at the first and second air inlets to intercept large particles.
[0008] Furthermore, the outer surface of the filter, the inner surface of the suction hood, and the two air inlets are coated with an anti-stick coating.
[0009] Furthermore, the suction hood has a C-shaped structure, and the second air inlet on its side wall is sealed to the air duct by a clamp.
[0010] Furthermore, the dust collector is a bag filter, which can be installed at a single point or for centralized processing.
[0011] In summary, this application includes at least one of the following beneficial technical effects:
[0012] This dust collection device for a ring die granulator uses a dual-channel system, consisting of a first and second air inlet, a suction hood, a dust collector, a flow regulating valve, and a dust sensor. The dust is collected through a primary filter and a secondary filter, and is effectively treated by the linkage and dynamic adjustment of the dust sensor and the flow regulating valve. This system aims to reduce dust pollution, improve the cleanliness of the operating environment, and protect the health of operators. Attached Figure Description
[0013] Figure 1 This is an overall schematic diagram of this application;
[0014] Figure 2 This is the front view of this application;
[0015] Figure 3 This is a schematic diagram of the internal structure of the head unit in this application;
[0016] Figure 4 This is a schematic diagram of the filter structure of this application.
[0017] In the picture:
[0018] 1-First air inlet, 2-Second air inlet, 3-Suction hood, 4-Dust collector, 5-Head of machine, 6-Discharge port, 7-Flow regulating valve, 8-Dust sensor, 9-Filter screen, 10-Pelletizing chamber, 11-Ring die, 12-Cutter.
[0019] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.
[0020] like Figure 1 and Figure 2 As shown, a dust collection device for a ring die pellet mill includes a first air inlet 1 and a second air inlet 2, a suction hood 3, and a dust collector 4. The first air inlet 1 is located above the side of the machine head 5. The suction hood 3 is located at the discharge port 6. The second air inlet 2 is located on the side wall of the suction hood 3. A flow regulating valve 7 is located at the first air inlet 1. A dust sensor 8 is installed on the side wall of the machine head 5. The dust sensor 8 and the flow regulating valve 7 are linked. The first air inlet 1 and the second air inlet 2 are connected to the inlet of the dust collector 4 through a duct. Figure 3As shown, the die head 5 of the ring die granulator is the granulation chamber 10 of the equipment, containing the ring die 11 and the cutter 12. The ring die 11 rotates at high speed, and the material enters the ring die hole under the extrusion of the pressure rollers. The material extruded from the ring die hole is cut into short columnar particles by the action of the cutter 12 assembly. Dust-laden gas is mainly generated during the extrusion granulation and material cutting process by the cutter 12. Therefore, the first air inlet 1 is arranged on the upper side of the die head 5, connecting to the internal granulation chamber 10. Dust is also generated at the discharge port 6, so a suction hood 3 is provided. The suction hood 3 surrounds the discharge port 6 in the middle, and a second air inlet 2 is provided on the side wall of the suction hood 3. Sufficient space is left between the suction hood 3 and the discharge port 6 for dust collection. The dust is collected through the above dual channels and transported to the bag filter 4 through the air duct. An electric flow regulating valve 7 is installed on the outside of the first air inlet 1. A laser dust sensor 8 is installed by drilling holes in the side wall of the machine head 5 to monitor the dust changes in the granulation chamber 10 and is linked with the flow regulating valve 7 via a PLC. Finally, after the dust passes through the flow regulating valve 7, it enters the bag filter 4 through the air duct to achieve the dust removal effect.
[0021] The first air vent 1 can also have 2 to 3 air vents to further reduce dust. The vents should be positioned in a suitable location in the granulation chamber 10, such as opposite the installation position of the cutter 12.
[0022] In addition, stainless steel filter screens 9 are also provided at the first air inlet 1 and the second air inlet 2. Figure 4 The filter screen 9 has a perforated plate structure, 2mm thick, with a pore size of 3mm, used to intercept large particles. To prevent dust from adhering to the air inlet due to stickiness and electrostatic effects, the outer surface of the filter screen 9, the inner surface of the suction hood 3, and the two air inlets are coated with a Teflon anti-stick coating. The suction hood 3 has a C-shaped structure, but other structures such as semi-circular or trumpet-shaped are also possible. The second air inlet 2 is sealed to the ductwork by a clamp. In this application, the collected dust is connected to a single-point bag filter 4 for individual processing via ductwork, or it can be systematically designed to connect the granulation chamber 10 and the suction hood 3 ductwork to a centralized dust collection system for centralized processing.
[0023] During production, the mixed materials are evenly fed into the inlet by a screw feeder. The ring die 11 rotates at high speed, and the material enters the ring die hole under the pressure of the pressure rollers. The material extruded from the ring die hole is cut into short columnar particles by the cutter assembly 12. This process generates a large amount of dust. The dust in the granulation chamber 10 at the die head 5 is drawn out from the first air inlet 1, filtered by the filter screen 9, and then enters the flow regulating valve 7 and the bag filter 4 through the duct. The dust at the outlet 6 passes through the suction hood 3 and the second air inlet 2, and then enters the bag filter 4 (filtration accuracy 0.3μm) through the duct. The dust undergoes primary filtration by the filter screen 9 and secondary filtration by the bag filter 4, achieving excellent dust removal and purification effects. The opening of the electric flow regulating valve 7 is controlled by the laser dust sensor 8 (range 0-500mg / m³).3 The ranges (with a response time of <0.3s) correspond one-to-one. The initial electric flow regulating valve 7 is opened at 50%. The laser dust sensor 8 collects dust data from the granulation chamber 10 in real time and dynamically adjusts the opening of the flow regulating valve 7 through the PLC control unit to achieve the purpose of dynamically adjusting the air volume in the granulation chamber 10, so as to avoid affecting the dust removal and purification effect due to excessive or insufficient air volume.
[0024] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A dust collecting device for ring die pelletizers, comprising a first air intake (1) and a second air intake (2), a suction hood (3), a dust extractor (4), characterized in that: The first air inlet (1) is located above the side of the machine head (5), the suction hood (3) is located at the discharge port (6), the side wall of the suction hood (3) is provided with the second air inlet (2), the first air inlet (1) is provided with the flow regulating valve (7), the side wall of the machine head (5) is equipped with the dust sensor (8), the dust sensor (8) and the flow regulating valve (7) are linked, and the first air inlet (1) and the second air inlet (2) are connected to the inlet of the dust collector (4) after they are connected through the air duct.
2. A dust collection device for a ring die pellet mill as defined in claim 1, characterized in that: A filter screen (9) is provided at the first air inlet (1) and the second air inlet (2) to intercept large particles of material.
3. A dust collection device for a ring die pellet mill as defined in claim 2, wherein: The outer surface of the filter screen (9), the inner surface of the suction hood (3) and the two air inlets are covered with an anti-stick coating.
4. A dust collection device for a ring die pellet mill as defined in claim 3, wherein: The suction hood (3) has a C-shaped structure, and the second air inlet (2) on its side wall is sealed to the air duct by a clamp.
5. A dust collection device for a ring die pellet mill as defined in claim 4, wherein: The dust collector (4) is a bag filter, which can be arranged at a single point or centrally processed.