Powder making equipment for crushing and grinding biomass

Abstract

The invention provides pulverizing equipment for crushing and grinding biomass, which comprises a driving device, a shell, a driving disc, a crushing device and a screening device, and is characterized in that the driving device is connected with the driving disc; the driving disc is arranged in the shell, the crushing device comprises a crushing wheel, the crushing wheel is arranged in the shell, and the outer surface of the crushing wheel is in contact with the upper surface of the driving disc; the screening device is arranged above the shell, a blanking pipe is arranged in the screening device, and the driving disc and the crushing wheel are matched to crush and grind materials; an air inlet is formed in the bottom of the shell, and the screening device is provided with a powder outlet. According to the pulverizing equipment, the shearing effect on materials is improved while the grinding mechanism is guaranteed, the grinding and crushing capacity for biomass-related fibrous materials is improved, control over the fineness of material powder is achieved, and the requirement for the fineness of biomass powder under different working conditions is met.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive application of biomass energy, and in particular to a pulverizing device for crushing and grinding biomass. Background Art

[0002] The carbon emissions of biomass are negligible compared to fossil energy, and the global reserves of biomass are abundant, second only to coal, oil and natural gas. In addition, its renewable characteristics make it one of the most promising renewable energy sources in the 21st century. In addition, biomass energy can also be used in green methanol, green aviation fuel and other fields.

[0003] In the field of biomass co-combustion or gasification, the feasibility of biomass milling is a prerequisite for many process routes. Factors such as energy consumption, output, fineness, reliability and cost of biomass milling equipment directly affect the development of biomass energy comprehensive utilization technology. On an industrial scale, there is currently no milling equipment for biomass materials. In existing experiments, the effect of crushers for biomass milling is good, but their production capacity is limited and it is difficult to meet the output requirements of co-combustion and gasification. Although the feasibility of using medium-speed mills, which are widely used for co-combustion and gasification, directly for biomass milling has been verified, the output loss is large and the fineness range is limited.

[0004] Therefore, there is an urgent need for an industrial-grade milling equipment that can be used for biomass crushing. Summary of the invention

[0005] The purpose of the present invention is to provide a biomass crushing and grinding milling device, which realizes dynamic and accurate control of the powder fineness in the biomass powder making process and solves the problem of industrial-scale biomass fine powder production.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A milling device for biomass crushing and grinding, comprising a driving device, a housing, an active disk, a crushing device and a screening device, wherein the driving device is connected to the active disk, and the driving device can drive the active disk to rotate; the active disk is arranged in the housing, the crushing device comprises a crushing wheel, the crushing wheel is arranged in the housing, the outer surface of the crushing wheel contacts the upper surface of the active disk, and the rotation of the active disk can drive the crushing wheel to rotate; the screening device is arranged above the housing, a material drop pipe is arranged in the screening device, biomass materials can be filled onto the active disk through the material drop pipe, and the active disk and the crushing wheel can crush and grind the materials in cooperation; an air inlet is arranged at the bottom of the housing, and the screening device is provided with a powder outlet, and gas can form an ascending airflow in the housing after entering the housing through the air inlet, and powder formed after material crushing and grinding enters the screening device driven by the ascending airflow, and powder with qualified particle size is discharged from the powder outlet after the powder is screened by the screening device.

[0008] Furthermore, in the above-mentioned milling equipment for biomass crushing and grinding, the milling equipment also includes a support seat and a transmission support part, the support seat includes a support plate and support legs, the support plate is connected to the lower end of the outer shell; the support legs are arranged below the support plate, and there are multiple support legs, and the transmission support part is arranged in the space surrounded by the multiple support legs; the active disk includes a disk body and a disk seat, the disk body and the disk seat are both cylindrical structures, the diameter of the disk body is larger than the diameter of the disk seat, the upper end of the disk seat is connected to the lower end of the disk body, the lower end of the disk seat passes through the support plate and is connected to the transmission support part, and the output end of the drive device is connected to the transmission support part.

[0009] Furthermore, in the above-mentioned milling equipment for biomass crushing and grinding, a plurality of circles of grooves are provided on the upper surface of the disc body, the center of the grooves is located on the axis of the disc body, and the plurality of circles of grooves are evenly distributed from the center of the disc body to the edge of the disc body; a plurality of convex teeth are evenly distributed on the outer surface of the crushing wheel in contact with the disc body.

[0010] Furthermore, in the above-mentioned milling equipment for biomass crushing and grinding, a plurality of material retaining rings are arranged on the disc body, the inner diameter of the material retaining rings is consistent with the inner diameter of the disc body, and the plurality of material retaining rings are arranged in sequence from bottom to top on the outer edge of the disc body, and the material retaining rings can form a material bed on the active disc, and the thickness of the material bed formed by the material on the active disc can be adjusted by adjusting the number of the material retaining rings; the diameter of the disc body is smaller than the inner diameter of the outer shell, and an air regulating ring is provided on the outer side of the disc body, and the air regulating ring is connected to the inner wall of the outer shell, and the air regulating ring can be used to adjust the flow rate and flow direction of the gas entering the outer shell from the air inlet.

[0011] Furthermore, in the above-mentioned pulverizing equipment for biomass crushing and grinding, a scraper plate is arranged on the outer wall of the disc seat, the bottom of the scraper plate extends in the direction away from the active disc, the scraper plate is perpendicular to the outer wall of the disc seat, the support plate is provided with a slag discharge hole, a slag discharge pipe is arranged below the support plate, and the slag discharge pipe is connected to the slag discharge hole; the active disc drives the scraper plate to rotate, and the scraper plate can discharge large pieces of material on the support plate through the slag discharge hole by rotating.

[0012] Furthermore, in the above-mentioned powder making equipment for biomass crushing and grinding, the crushing device also includes a cylinder, a transmission arm and a fixed arm seat, the cylinder is arranged on the outer wall of the upper part of the outer shell, the transmission arm includes a main arm and a secondary arm, one end of the main arm is connected to one end of the secondary arm, and the other end of the secondary arm is hinged to the output end of the cylinder, the fixed arm seat is arranged on the outer wall of the outer shell, and one end of the main arm is hinged to the fixed arm seat; the crushing wheel is arranged above the active disk, and the crushing wheel is provided with a wheel axle, one end of the wheel axle is connected to the crushing wheel, and the other end of the wheel axle passes through the outer shell and is connected to the other end of the main arm; the crushing device is evenly arranged in multiple pieces along the circumference of the outer shell.

[0013] Furthermore, in the above-mentioned milling equipment for biomass crushing and grinding, the screening device includes a motor, a driving shaft, an upper shell and a lower shell, the lower end of the upper shell is connected to the upper end of the lower shell by a connecting plate, the upper shell is a cylindrical structure, and the connecting plate is provided with a through hole; the lower shell includes an upper section and a lower section, the lower end of the upper section is connected to the upper end of the lower section, the upper section is a cylindrical structure, and the lower section is a truncated cone structure, the inner diameter of the upper end of the lower section is larger than the inner diameter of the lower end of the lower section, the inner diameter of the upper shell is smaller than the inner diameter of the upper section, the powder outlet is provided on the upper shell, the outer diameter of the connecting plate is larger than the outer diameter of the upper section, and the diameter of the through hole is consistent with the inner diameter of the upper shell; the motor is provided in the A rotor is arranged in the upper section of the lower shell above the upper shell, and the height of the rotor is consistent with the height of the upper section. The output end of the motor is connected to the rotor through the drive shaft, and the motor drives the rotor to rotate through the drive shaft; a guide stator is arranged on the outer side of the rotor, and the upper end of the guide stator is connected to the connecting plate. The guide stator is vertically provided with a plurality of blades, and the blades are evenly distributed along the circumference of the lower shell. The blades are detachable and the inclination angle can be adjusted. By adjusting the number and inclination angle of the blades, the fineness of the powder entering the guide stator can be controlled; the inner diameter of the upper shell is less than or equal to the inner diameter of the guide stator; the motor is a variable frequency motor; and the drive shaft is a hollow shaft.

[0014] Furthermore, in the above-mentioned powder-making equipment for biomass crushing and grinding, the screening device also includes a powder return hopper, which is arranged directly below the guide stator, and the powder return hopper is a truncated cone structure. The diameter of the upper end of the powder return hopper is larger than the diameter of the lower end of the powder return hopper, and the upper end of the powder return hopper is connected to the lower shell body through a plurality of supporting ribs, and the lower end of the powder return hopper is connected to the upper end of the powder return pipe, and the lower end of the powder return pipe extends into the outer shell; the upper end of the drop pipe is located above the screening device, and the lower end of the drop pipe extends into the powder return hopper after passing through the drive shaft; after the powder is screened by the screening device, the powder with unqualified particle size falls back from the powder return hopper to the active disk for re-crushing and grinding.

[0015] Furthermore, in the above-mentioned powder making equipment for biomass crushing and grinding, the screening device also includes a wind shield, which includes a cover shell and a cover pipe, the upper end of the cover shell is connected to the lower end of the powder return pipe, the lower end of the cover shell is connected to the upper end of the cover pipe, the lower end of the cover pipe extends to the space enclosed by the crushing wheel and the active disk, and the outer diameter of the cover pipe is smaller than the outer diameter of the cover shell.

[0016] Furthermore, in the above-mentioned milling equipment for biomass crushing and grinding, the cover pipe includes a plurality of cover tiles, the cover tiles are vertically arranged, the upper ends of the cover tiles are connected to the cover shell, there is a gap between two adjacent cover tiles, and the plurality of cover tiles form the cover pipe; the cover tiles are made of composite wear-resistant steel plates.

[0017] It can be seen from the analysis that the present invention discloses a milling equipment for biomass crushing and grinding. By processing the tooth shape of the crushing wheel and the active disk surface area, the shearing effect on the material is improved while ensuring the grinding mechanism, thereby enhancing the grinding and crushing ability for biomass-related fibrous materials. The wind shield can reduce the gap between multiple crushing wheels, thereby effectively preventing the biomass raw materials from being affected by the gas flow field during the feeding process through the drop pipe. By adjusting the loading force of the oil cylinder in the crushing device, the rotation speed of the rotor of the screening device, and the inclination angle of the blades of the guide stator, the powder fineness can be controlled to meet the biomass powder fineness requirements under different working conditions. The dynamic and precise control of the powder fineness in the biomass milling process solves the problem of industrial-scale biomass fine powder production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the cooperation between the crushing wheel and the active disc according to an embodiment of the present invention.

[0021] Figure 3 The figure is a schematic structural diagram of a crushing device according to an embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a screening device according to an embodiment of the present invention.

[0023] Figure 5 The figure is a schematic structural diagram of a wind shield according to an embodiment of the present invention.

[0024] Description of reference numerals: 1 driving device; 2 transmission support part; 3 support seat; 301 slag discharge pipe; 302 support plate; 303 support leg; 4 housing; 5 air regulating ring; 6 active disk; 601 disk body; 602 material retaining ring; 603 scraper plate; 604 disk seat; 605 groove; 7 crushing device; 701 crushing wheel; 702 wheel shaft; 703 convex tooth; 704 oil cylinder; 705 transmission arm; 7051 main arm; 705 2 auxiliary arm; 706 fixed arm seat; 8 screening device; 800 connecting plate; 801 upper shell; 802 lower shell; 8021 upper section; 8022 lower section; 8023 supporting ribs; 803 motor; 804 rotor; 805 powder outlet; 806 guide stator; 807 powder return hopper; 808 powder return pipe; 809 driving shaft; 9 drop pipe; 10 wind shield; 1001 cover shell; 1002 cover pipe; 11 air inlet. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0026] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numbers and letter labels to refer to features in the drawings. Like or similar labels in the drawings and description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first", "second", "third", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0028] like Figures 1 to 5 As shown, according to an embodiment of the present invention, a milling device for biomass crushing and grinding is provided. As shown in 1, the milling device includes a driving device 1, a housing 4, an active disk 6, a crushing device 7 and a screening device 8, wherein the driving device 1 is connected to the active disk 6, and the driving device 1 can drive the active disk 6 to rotate; the active disk 6 is arranged in the housing 4; the crushing device 7 includes a crushing wheel 701, the crushing wheel 701 is arranged in the housing 4, the outer surface of the crushing wheel 701 is in contact with the upper surface of the active disk 6, and the rotation of the active disk 6 can drive the crushing wheel 701 to rotate; the screening device 8 is arranged above the shell 4, and a feeding pipe 9 is arranged in the screening device 8. The biomass material can be filled onto the active disk 6 through the feeding pipe 9. The active disk 6 and the crushing wheel 701 can cooperate to crush and grind the material; an air inlet 11 is arranged at the bottom of the shell 4, and the screening device 8 is provided with a powder outlet 805. After the gas enters the shell 4 through the air inlet 11, an ascending airflow can be formed in the shell 4. The powder formed after the material is crushed and ground enters the screening device 8 driven by the ascending airflow. After the powder is screened by the screening device 8, the powder with a qualified particle size is discharged from the powder outlet 805.

[0029] Furthermore, the milling equipment further comprises a support seat 3 and a transmission support part 2, the support seat 3 comprises a support plate 302 and a support leg 303, the housing 4 is mounted on the support seat 3, the support plate 302 is connected to the lower end of the housing 4; the support leg 303 is arranged below the support plate 302, a plurality of support legs 303 are arranged, and the transmission support part 2 is arranged in a space surrounded by the plurality of support legs 303; Figure 2 As shown, the active disk 6 includes a disk body 601 and a disk seat 604. Both the disk body 601 and the disk seat 604 are cylindrical structures. The diameter of the disk body 601 is larger than the diameter of the disk seat 604. The upper end of the disk seat 604 is connected to the lower end of the disk body 601. The lower end of the disk seat 604 passes through the support plate 302 and is connected to the transmission support part 2. The output end of the driving device 1 is connected to the transmission support part 2. The transmission support part 2 is used to support and drive the active disk 6 to rotate.

[0030] Furthermore, the upper surface of the disk body 601 is provided with a plurality of grooves 605, the center of which is located on the axis of the disk body 601, and the plurality of grooves 605 are evenly distributed from the center of the disk body 601 to the edge of the disk body 601, and the depths of the plurality of grooves 605 are consistent; and a plurality of convex teeth 703 are evenly distributed on the outer surface of the crushing wheel 701 in contact with the disk body 601. By performing tooth processing on the surface of the crushing wheel 701 and the surface contact area of ​​the active disk 6 (the grooves 605 provided on the upper surface of the disk body 601 and the convex teeth 703 provided on the outer surface of the crushing wheel 701), while ensuring the grinding mechanism, the shearing effect on the material and the effective residence time of the material on the active disk 6 are improved, the fibrous structure of the biomass is effectively crushed, and the economic efficiency of the milling equipment is improved on the basis of meeting the needs of the biomass industrial milling.

[0031] Furthermore, a plurality of material retaining rings 602 are arranged on the disc body 601, and the inner diameter of the material retaining rings 602 is consistent with the inner diameter of the disc body 601. The plurality of material retaining rings 602 are arranged sequentially from bottom to top on the outer edge of the disc body 601. The material retaining rings 602 can form a material bed on the active disc 6. By adjusting the number of material retaining rings 602, the thickness of the material bed formed by the material on the active disc 6 can be adjusted. The diameter of the disc body 601 is smaller than the inner diameter of the outer shell 4. An air regulating ring 5 is sleeved on the outer side of the disc body 601. The air regulating ring 5 is connected to the inner wall of the outer shell 4. The air regulating ring 5 can be used to adjust the flow rate and flow direction of the gas entering the outer shell 4 from the air inlet 11. By controlling the height of the material retaining ring 602 on the outer side of the active disc 6 to control the thickness of the biomass material bed, the crushing ability of biomass-related fibrous materials can be improved.

[0032] Furthermore, a scraper plate 603 is arranged on the outer wall of the disk base 604, and the bottom of the scraper plate 603 extends in the direction away from the active disk 6, and the scraper plate 603 is perpendicular to the outer wall of the disk base 604, and the support plate 302 is provided with a slag discharge hole, and a slag discharge pipe 301 is arranged below the support plate 302, and the slag discharge pipe 301 is connected to the slag discharge hole; the active disk 6 drives the scraper plate 603 to rotate, and the scraper plate 603 can discharge large pieces of material on the support plate 302 from the slag discharge hole through the slag discharge pipe 301 by rotating.

[0033] Furthermore, if Figure 3As shown, the crushing device 7 also includes a cylinder 704, a transmission arm 705 and a fixed arm seat 706. The cylinder 704 is arranged on the outer wall of the upper part of the shell 4. The transmission arm 705 includes a main arm 7051 and a secondary arm 7052. One end of the main arm 7051 is connected to one end of the secondary arm 7052, and the other end of the secondary arm 7052 is hinged to the output end of the cylinder 704. The fixed arm seat 706 is arranged on the outer wall of the shell 4, and one end of the main arm 7051 is hinged to the fixed arm seat 706; the crushing wheel 701 is arranged above the active disk 6, and the crushing wheel 701 is provided with a wheel shaft 702, one end of the wheel shaft 702 is connected to the crushing wheel 701, and the other end of the wheel shaft 702 passes through the shell 4 and is connected to the other end of the main arm 7051. The upper end of the crushing wheel 701 is inclined toward the center of the shell 4, and the axis of the wheel shaft 702 of the crushing wheel 701 has an angle with the upper surface of the active disk 6; the crushing device 7 is evenly arranged with multiple wheels along the circumference of the shell 4. The crushing pressure of the crushing wheel 701 can be adjusted by adjusting the output pressure of the oil cylinder 704. Driven by the transmission arm 705 controlled by the oil cylinder 704, the crushing wheel 701 can press on the active disk 6 to grind the material. The friction force generated by the biomass material and the crushing wheel 701 drives the rotation of the crushing wheel 701, so that the action point of crushing the biomass material changes in real time, thereby achieving continuous and efficient grinding of the biomass material between the active disk 6 and the crushing wheel 701.

[0034] Furthermore, if Figure 4As shown, the screening device 8 includes a motor 803, a drive shaft 809, an upper shell 801 and a lower shell 802. The lower end of the upper shell 801 is connected to the upper end of the lower shell 802 through a connecting plate 800. The upper shell 801 is a cylindrical structure. The connecting plate 800 is provided with a through hole. The lower shell 802 includes an upper section 8021 and a lower section 8022. The lower end of the upper section 8021 is connected to the upper end of the lower section 8022. The upper section 8021 is a cylindrical structure. The lower section 8022 is a truncated cone structure, the inner diameter of the upper end of the lower section 8022 is larger than the inner diameter of the lower end of the lower section 8022, the inner diameter of the upper shell 801 is smaller than the inner diameter of the upper section 8021, the outer diameter of the connecting plate 800 is larger than the outer diameter of the upper section 8021, and the diameter of the through hole is consistent with the inner diameter of the upper shell 801; the powder outlet 805 is arranged on the upper shell 801; the motor 803 is arranged above the upper shell 801, and the upper section 802 of the lower shell 802 is A rotor 804 is arranged in 021, and the height of the rotor 804 is consistent with the height of the upper section 8021 of the lower shell 802. The output end of the motor 803 is connected to the rotor 804 through the driving shaft 809, and the motor 803 drives the rotor 804 to rotate through the driving shaft 809; a guide stator 806 is arranged on the outside of the rotor 804, and the upper end of the guide stator 806 is connected to the connecting plate 800. There is a distance between the outer wall of the guide stator 806 and the inner wall of the upper shell 801. The guide stator 806 is vertically arranged with a plurality of blades, and the plurality of blades are evenly distributed along the circumference of the lower shell 802. The blades are detachable and the inclination angle can be adjusted. By adjusting the number of blades and the inclination angle, the fineness of the powder entering the guide stator 806 can be controlled; the inner diameter of the upper shell 801 is less than or equal to the inner diameter of the guide stator 806; the motor 803 is a variable frequency motor 803, and the driving shaft 809 is a hollow shaft. By using the motor 803 to adjust the rotation speed of the rotor 804 and adjusting the inclination angle and number of the blades of the guide stator 806, the material transported from the bottom of the screening device 8 can be screened, and then the fineness of the biomass powder can be controlled, thereby achieving dynamic and precise control of the powder selection fineness in the biomass powder making process, solving the problem of industrial-scale biomass fine powder production.

[0035] Furthermore, the screening device 8 also includes a powder return hopper 807, which is arranged directly below the guide stator 806. The powder return hopper 807 is a truncated cone structure. The diameter of the upper end of the powder return hopper 807 is larger than the diameter of the lower end of the powder return hopper 807. The upper end of the powder return hopper 807 is connected to the lower shell 802 through a plurality of support ribs 8023, and the plurality of support ribs 8023 are evenly distributed along the circumference of the lower shell 802. The lower end of the powder return hopper 807 is connected to the upper end of the powder return pipe 808, and the lower end of the powder return pipe 808 extends into the outer shell 4; the upper end of the drop pipe 9 is located above the screening device 8, and the lower end of the drop pipe 9 extends into the powder return hopper 807 after passing through the drive shaft 809, and the axis of the drop pipe 9 is colinear with the axis of the active disk 6; after the powder is screened by the screening device 8, the powder with unqualified particle size falls back from the powder return hopper 807 to the active disk 6 for re-crushing and grinding.

[0036] Furthermore, the screening device 8 also includes a wind shield 10, such as Figure 5 As shown, the wind shield 10 includes a cover shell 1001 and a cover pipe 1002, the upper end of the cover shell 1001 is connected to the lower end of the powder return pipe 808, the lower end of the cover shell 1001 is connected to the upper end of the cover pipe 1002, the cover shell 1001 is located above the crushing wheel 701, the lower end of the cover pipe 1002 extends to the space surrounded by the crushing wheel 701 and the active disk 6, and the outer diameter of the cover pipe 1002 is smaller than the outer diameter of the cover shell 1001. The wind shield 10 is connected to the powder return pipe 808 by welding, and the wind shield 10 can reduce the gap between multiple crushing wheels 701, thereby effectively preventing the biomass raw materials from being affected by the gas flow field above the active disk 6 during the feeding process through the drop pipe 9.

[0037] Furthermore, the cover pipe 1002 includes a plurality of cover tiles, which are arranged vertically. The upper ends of the cover tiles are connected to the cover shell 1001. There is a gap between two adjacent cover tiles. The plurality of cover tiles surround the cover pipe 1002. The cover tiles are made of composite wear-resistant steel plates.

[0038] The working process of the powder making equipment is as follows:

[0039] The horizontally placed active disk 6 is driven to rotate by the driving device 1 through the transmission support 2, and the biomass material falls vertically from the drop pipe 9 that penetrates the screening device 8. Under the protection of the wind shield 10 below the screening device 8, the influence of the internal flow field on the falling of the biomass material can be reduced, ensuring that the biomass can fall to the center of the active disk 6. The biomass spreads around under the centrifugal force generated by the rotation of the active disk 6, and forms a material layer of a certain thickness under the protection of the material retaining ring 602. The thickness of the biomass material bed formed on the active disk 6 is controlled by adjusting the number of material retaining rings 602. The transmission arm 705 is loaded by the oil cylinder 704, so that the transmission arm 705 transmits the loading force to the crushing wheel 701, and the crushing wheel 701 crushes the biomass material under the dual pressure of its own gravity and the oil cylinder 704 driving the transmission arm 705. At the same time, the friction force generated by the biomass material and the crushing wheel 701 drives the crushing wheel 701 to rotate, so that the point of action of crushing the biomass material changes in real time, thereby achieving continuous and efficient grinding of the biomass material between the active disk 6 and the crushing wheel 701.

[0040] Under the continuous action of the centrifugal force of the active disk 6, the powder formed after the material is crushed passes over the material retaining ring 602 and is mixed into the high-speed airflow rising from the air inlet 11 through the air regulating ring 5. The material with smaller particle size enters the screening device 8 under the high-speed airflow, and the impurities such as metals and stones with larger density cannot be carried by the airflow and fall onto the support plate 302, and are discharged through the slag discharge pipe 301 by the scraper plate 603 rotating with the active disk 6. The screening device 8 is driven by the motor 803, which drives the rotor 804 to rotate. The material transported from the bottom is screened by adjusting the speed of the rotor 804 and the inclination angle of the blades of the guide stator 806. The powder return hopper 807 is fixedly connected to the bottom of the guide stator 806. The powder return hopper 807 is used to recover the powder with unqualified particle size screened by the screening device 8 and return it to the active disk 6 for re-grinding, and the qualified powder is discharged from the powder outlet 805. During operation, the rotation speed of the rotor 804 is changed by adjusting the rotation speed of the motor 803 of the screening device 8, thereby flexibly controlling the powder selection fineness of the material.

[0041] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0042] A pulverizing device for biomass crushing and grinding, by processing the tooth shape of the crushing wheel 701 and the surface area of ​​the active disk 6, while ensuring the grinding mechanism, the shearing effect on the material is improved, and the grinding and crushing ability for biomass-related fibrous materials is improved. The wind shield 10 can reduce the gap between the multiple crushing wheels 701, thereby effectively preventing the biomass raw materials from being affected by the gas flow field during the feeding process through the drop pipe 9. By adjusting the loading force of the oil cylinder 704 of the crushing device 7, the rotation speed of the rotor 804 of the screening device 8, and the inclination angle of the blades of the guide stator 806, the fineness of the material powder can be controlled to meet the biomass powder fineness requirements under different working conditions. The dynamic and precise control of the material powder fineness in the biomass pulverizing process is achieved, solving the problem of industrial-scale biomass fine powder production.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A milling equipment for biomass crushing and grinding, characterized in that: It includes a driving device, a housing, an active disc, a crushing device and a screening device, wherein: The driving device is connected to the active disk, and the driving device can drive the active disk to rotate; the active disk is arranged in the housing, The crushing device comprises a crushing wheel, the crushing wheel is arranged in the housing, the outer surface of the crushing wheel contacts the upper surface of the active disk, and the rotation of the active disk can drive the crushing wheel to rotate; The screening device is arranged above the housing, and a material drop pipe is arranged inside the screening device. The biomass material can be filled onto the active disk through the material drop pipe, and the active disk and the crushing wheel cooperate to crush and grind the material; An air inlet is provided at the bottom of the shell, and the screening device is provided with a powder outlet. After the gas enters the shell through the air inlet, an upward airflow can be formed in the shell. The powder formed after the material is crushed and ground enters the screening device driven by the upward airflow. After the powder is screened by the screening device, the powder with a qualified particle size is discharged from the powder outlet.

2. The milling equipment for biomass crushing and grinding according to claim 1, characterized in that: The flour making equipment further comprises a support seat and a transmission support part, wherein the support seat comprises a support plate and a support leg, wherein the support plate is connected to the lower end of the housing; the support leg is arranged below the support plate, and a plurality of the support legs are arranged, and the transmission support part is arranged in a space surrounded by the plurality of the support legs; The active disk includes a disk body and a disk seat, both of which are cylindrical structures. The diameter of the disk body is larger than the diameter of the disk seat. The upper end of the disk seat is connected to the lower end of the disk body, and the lower end of the disk seat is connected to the transmission support part after passing through the support plate. The output end of the drive device is connected to the transmission support part.

3. The milling equipment for biomass crushing and grinding according to claim 2, characterized in that: The upper surface of the disk body is provided with a plurality of circles of grooves, the center of the circle of the grooves is located on the axis of the disk body, and the plurality of circles of the grooves are evenly distributed from the center of the disk body to the edge of the disk body; A plurality of convex teeth are evenly distributed on the outer surface of the crushing wheel in contact with the disc body.

4. The milling equipment for biomass crushing and grinding according to claim 2, characterized in that: The disc body is provided with a plurality of material retaining rings, the inner diameter of the material retaining rings is consistent with the inner diameter of the disc body, and the plurality of material retaining rings are sequentially arranged from bottom to top on the outer edge of the disc body, and the material retaining rings can form a material bed on the active disc, and the thickness of the material bed formed by the material on the active disc can be adjusted by adjusting the number of the material retaining rings; The diameter of the disk body is smaller than the inner diameter of the shell. An air regulating ring is sleeved on the outer side of the disk body. The air regulating ring is connected to the inner wall of the shell. The air regulating ring can be used to adjust the flow rate and direction of the gas entering the shell from the air inlet.

5. The milling equipment for biomass crushing and grinding according to claim 2, characterized in that: A scraper plate is provided on the outer wall of the disc seat, the bottom of the scraper plate extends in a direction away from the active disc, the scraper plate is perpendicular to the outer wall of the disc seat, the support plate is provided with a slag discharge hole, a slag discharge pipe is provided below the support plate, and the slag discharge pipe is connected to the slag discharge hole; The active disk drives the scraper plate to rotate, and the scraper plate can discharge the bulk materials on the support plate through the slag discharge hole through the rotation.

6. The milling equipment for biomass crushing and grinding according to claim 1, characterized in that: The crushing device also includes an oil cylinder, a transmission arm and a fixed arm seat, wherein the oil cylinder is arranged on the outer wall of the upper part of the shell, the transmission arm includes a main arm and a secondary arm, one end of the main arm is connected to one end of the secondary arm, and the other end of the secondary arm is hinged to the output end of the oil cylinder, and the fixed arm seat is arranged on the outer wall of the shell, and one end of the main arm is hinged to the fixed arm seat; The crushing wheel is arranged above the active disk, and the crushing wheel is provided with a wheel shaft, one end of the wheel shaft is connected to the crushing wheel, and the other end of the wheel shaft passes through the housing and is connected to the other end of the main arm; A plurality of crushing devices are evenly arranged along the circumference of the shell.

7. The milling equipment for biomass crushing and grinding according to claim 1, characterized in that: The screening device comprises a motor, a driving shaft, an upper shell and a lower shell, the lower end of the upper shell is connected to the upper end of the lower shell by a connecting plate, the upper shell is a cylindrical structure, and the connecting plate is provided with a through hole; The lower shell comprises an upper section and a lower section, the lower end of the upper section is connected to the upper end of the lower section, the upper section is a cylindrical structure, the lower section is a truncated cone structure, the inner diameter of the upper end of the lower section is larger than the inner diameter of the lower end of the lower section, the inner diameter of the upper shell is smaller than the inner diameter of the upper section, the powder outlet is arranged on the upper shell, the outer diameter of the connecting plate is larger than the outer diameter of the upper section, and the diameter of the through hole is consistent with the inner diameter of the upper shell; The motor is arranged above the upper housing, a rotor is arranged in the upper section of the lower housing, the height of the rotor is consistent with the height of the upper section, the output end of the motor is connected to the rotor through the driving shaft, and the motor drives the rotor to rotate through the driving shaft; A guide stator is arranged on the outer side of the rotor, the upper end of the guide stator is connected to the connecting plate, a plurality of blades are arranged vertically on the guide stator, the plurality of blades are evenly distributed along the circumference of the lower shell, the blades are detachable and the inclination angle can be adjusted, and the fineness of the powder entering the guide stator can be controlled by adjusting the number and inclination angle of the blades; The inner diameter of the upper shell is less than or equal to the inner diameter of the guide stator; The motor is a variable frequency motor; The driving shaft is a hollow shaft.

8. The milling equipment for biomass crushing and grinding according to claim 7, characterized in that: The screening device further includes a powder return hopper, which is arranged directly below the guide stator, and is a truncated cone-shaped structure, wherein the diameter of the upper end of the powder return hopper is greater than the diameter of the lower end of the powder return hopper, and the upper end of the powder return hopper is connected to the lower shell body through a plurality of supporting ribs, and the lower end of the powder return hopper is connected to the upper end of the powder return pipe, and the lower end of the powder return pipe extends into the shell body; The upper end of the drop pipe is located above the screening device, and the lower end of the drop pipe passes through the driving shaft and extends into the powder return hopper; After the powder is screened by the screening device, the powder with unqualified particle size falls back from the powder return hopper to the active disk for re-crushing and grinding.

9. The milling equipment for biomass crushing and grinding according to claim 8, characterized in that: The screening device also includes a wind shield, which includes a cover shell and a cover pipe. The upper end of the cover shell is connected to the lower end of the powder return pipe, the lower end of the cover shell is connected to the upper end of the cover pipe, and the lower end of the cover pipe extends into the space surrounded by the crushing wheel and the active disk. The outer diameter of the cover pipe is smaller than the outer diameter of the cover shell.

10. The milling equipment for biomass crushing and grinding according to claim 9, characterized in that: The cover pipe comprises a plurality of cover tiles, which are arranged vertically, the upper ends of which are connected to the cover shell, there is a gap between two adjacent cover tiles, and the plurality of cover tiles surround the cover pipe; The cover tile is made of composite wear-resistant steel plate.

Images