A powder secondary classification device

Abstract

This utility model discloses a secondary powder classification device, relating to the field of crushing equipment technology, including: a disc mill, a classifier, a first dust collector, and a second dust collector. The disc mill has a crushing feed pipe at the lower end of its side wall and an upper outlet pipe at the upper end of its side wall. The material passes through the disc mill from bottom to top and is gradually crushed. A middle discharge pipe is located in the middle of the side wall of the disc mill. The classifier is connected to a coarse powder outlet pipe, a medium powder outlet pipe, and a classification inlet pipe. The classification inlet pipe is connected to the middle discharge pipe, and the coarse powder outlet pipe is connected to a first receiving container. The first dust collector is connected to the medium powder outlet pipe, and a second receiving container is located at its lower end. The second dust collector is connected to the upper outlet pipe. Both the first and second dust collectors are used to separate the crushed material. A third receiving container is located at the lower end of the second dust collector. This utility model can simultaneously produce three different particle sizes: coarse powder, medium powder, and fine powder.

Description

Technical Field

[0001] This utility model relates to the field of crushing equipment technology, and in particular to a powder secondary classification device. Background Technology

[0002] A crusher is a machine that crushes large solid raw materials to the required size. The external forces applied to the solid during the crushing process include shearing, impact, crushing, and grinding. Shearing is mainly used in coarse crushing and pulverizing operations, suitable for crushing or pulverizing tough or fibrous materials and large pieces; impact is mainly used in pulverizing operations, suitable for crushing brittle materials; crushing is mainly used in high-fineness pulverizing operations, suitable for ultra-fine pulverizing of most materials; grinding is mainly used in ultra-fine pulverizing or ultra-large pulverizing equipment, suitable for further pulverization after crushing. Currently, traditional processes usually rely on multiple devices such as coarse crushers, fine mills, and classifying screens connected in series to achieve multi-stage particle size output. This results in high energy consumption, large footprint, and inflexible product switching; while single classifying equipment often struggles to simultaneously and efficiently separate coarse, medium, and fine powders. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a powder secondary classification device that can simultaneously produce three different particle sizes: coarse powder, medium powder, and fine powder.

[0004] A powder secondary classification device according to a first aspect of the present invention includes: a disc mill, a classifier, a first dust collector, and a second dust collector. The lower end of the sidewall of the disc mill is provided with a crushing feed pipe, and the upper end of the sidewall of the disc mill is provided with an upper outlet pipe. The material passes through the disc mill from bottom to top and is gradually crushed. A middle discharge pipe is provided in the middle of the sidewall of the disc mill. The classifier is connected to a coarse powder outlet pipe, a medium powder outlet pipe, and a classification inlet pipe. The classification inlet pipe is connected to the middle discharge pipe, and the coarse powder outlet pipe is connected to a first receiving container. The first dust collector is connected to the medium powder outlet pipe, and the outlet of the first dust collector is connected to a first negative pressure fan. The first negative pressure fan is used to generate a pressure difference to drive the powder in the disc mill to flow towards the first dust collector. A second receiving container is provided at the lower end of the first dust collector. The second dust collector is connected to the upper outlet pipe, and the outlet of the second dust collector is connected to a second negative pressure fan. The second negative pressure fan is used to generate a pressure difference to drive the powder in the disc mill to flow towards the second dust collector. Both the first dust collector and the second dust collector are used to separate the crushed material. A third receiving container is provided at the lower end of the second dust collector.

[0005] A secondary powder classification device according to an embodiment of this utility model has at least the following beneficial effects: the material passes through the disc mill from bottom to top and is gradually crushed. The material discharged from the middle outlet pipe is the material that has been crushed once in the disc mill but has not reached the fine powder particle size and has been screened out by the first classification. The fine powder screened to the top of the disc mill and passing through the upper outlet pipe directly enters the second dust collector and is collected in the third receiving container. The classifier is used to separate coarse powder and medium powder, which enter the first receiving container and the second receiving container respectively. It can simultaneously produce three products with different particle sizes: coarse powder, medium powder, and fine powder to meet process requirements.

[0006] According to some embodiments of this utility model, the intermediate discharge pipe is provided with a first iron remover, which is used to remove magnetic substances from the material passing through the intermediate discharge pipe; the coarse powder outlet pipe is provided with a second iron remover, which is used to remove magnetic substances from the material passing through the coarse powder outlet pipe for a second time; and a third iron remover is provided between the first dust collector and the second receiving container, which is used to remove magnetic substances from the material discharged by the first dust collector.

[0007] According to some embodiments of the present invention, the intermediate discharge pipe is connected to a compressed air source to assist the material in passing through the intermediate discharge pipe.

[0008] According to some embodiments of this utility model, the grading inlet pipe is connected to the intermediate outlet pipe through a first switching valve, the second dust collector is connected to a fine powder inlet pipe, the fine powder inlet pipe is connected to the upper outlet pipe through a second switching valve, the first switching valve and the second switching valve are connected through a bypass pipe, and the first switching valve and the second switching valve are two-position three-way valves.

[0009] According to some embodiments of the present invention, the lower end of the first dust collector is connected to a medium powder discharge valve, the coarse powder outlet pipe is connected to a coarse powder discharge valve, and the lower end of the second dust collector is connected to a fine powder discharge valve.

[0010] According to some embodiments of this utility model, the crushing feed pipe is connected to a feeding mechanism and a filter.

[0011] According to some embodiments of this utility model, the first receiving container, the second receiving container, and the third receiving container are all ton bags.

[0012] According to some embodiments of the present invention, the first dust collector and the second dust collector are bag filters.

[0013] According to some embodiments of the present invention, the disc mill includes a housing, a main shaft, a feed chamber, and a discharge chamber. The upper end of the housing is connected to the discharge chamber, and the lower end of the housing is connected to the feed chamber. A main shaft is rotatably arranged inside the housing along the axial direction of the housing. A plurality of disc assemblies are arranged along the axial direction of the main shaft in the portion of the main shaft located inside the housing. A power component is connected to the lower end of the main shaft. An intermediate discharge pipe is connected to the side wall of the housing. The height of the connection between the intermediate discharge pipe and the housing is greater than the height of the lowermost disc assembly and less than the height of the uppermost disc assembly.

[0014] According to some embodiments of the present invention, the power component includes a motor, which is connected to the main shaft via a pulley assembly disposed at the lower end of the main shaft.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the installation structure of one embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of a disc mill according to an embodiment of the present invention.

[0019] Icon labels:

[0020] Disc mill 100, housing 101, main shaft 102, feed bin 103, discharge bin 104, disc assembly 105, motor 106, pulley assembly 107, crushing feed pipe 110, feeding mechanism 111, filter 112, upper outlet pipe 120, intermediate discharge pipe 130, first iron remover 131, compressed air source 132;

[0021] Classifier 200, coarse powder outlet pipe 210, second iron remover 211, coarse powder discharge valve 212, medium powder outlet pipe 220, classification inlet pipe 230;

[0022] First receiving container 300;

[0023] First dust collector 400, third iron remover 410, fine powder inlet pipe 420, medium powder outlet valve 430;

[0024] First negative pressure fan 500;

[0025] Second receiving container 600;

[0026] Second dust collector 700, third receiving container 710, fine powder discharge valve 720;

[0027] Second negative pressure fan 800;

[0028] First switching valve 900, second switching valve 910, bypass pipe 920. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 2As shown, an embodiment of this utility model discloses a secondary powder classification device, comprising: a disc mill 100, a classifier 200, a first dust collector 400, and a second dust collector 700. The lower end of the side wall of the disc mill 100 is provided with a crushing feed pipe 110, and the upper end of the side wall of the disc mill 100 is provided with an upper outlet pipe 120. The material passes through the disc mill 100 from bottom to top and is gradually crushed. A middle discharge pipe 130 is provided in the middle of the side wall of the disc mill 100; the middle discharge pipe 130 draws in the material that has undergone preliminary crushing but has not yet reached the final particle size in the disc mill 100. When the material moves from bottom to top in the disc mill 100, it is subjected to airflow and mechanical force. Coarser particles are more likely to remain in the lower or middle part due to gravity or centrifugal force, while finer particles are more likely to be carried upwards by the airflow. This flow pattern itself has a preliminary classification effect. The classifier 200 is connected to a coarse powder outlet pipe 210, a medium powder outlet pipe 220, and a classification inlet pipe 230. The classification inlet pipe 230 is connected to an intermediate discharge pipe 130, and the coarse powder outlet pipe 210 is connected to a first receiving container 300. The classifier 200 is used to separate coarse powder with a particle size of 1.2-1.3 mm and medium powder with a particle size of 1.1-1.2 mm. The coarse powder and medium powder enter the first receiving container 300 and the second receiving container 600, respectively. The classifier 200 is a horizontal classifier 200, and its specific structure is existing technology, so it will not be described in detail. The first dust collector 400 is connected to the medium powder outlet pipe 220. The outlet of the first dust collector 400 is connected to a first negative pressure fan 500. The first negative pressure fan 500 is used to generate a pressure difference to drive the powder in the disc mill 100 to flow towards the first dust collector 400. A second receiving container 600 is provided at the lower end of the first dust collector 400. The second dust collector 700 is connected to the upper outlet pipe 120. The outlet of the second dust collector 700 is connected to a second negative pressure fan 800. The second negative pressure fan 800 is used to generate a pressure difference to drive the powder in the disc mill 100 to flow towards the second dust collector 700. Both the first dust collector 400 and the second dust collector 700 are used to separate the crushed material. A third receiving container 710 is provided at the lower end of the second dust collector 700. The material rising to the top of the disc mill 100 and passing through the upper outlet pipe 120 is fine powder with a particle size of 0.8-0.9mm. This fine powder directly enters the second dust collector 700 and is collected in the third receiving container 710. It can simultaneously produce three different particle sizes: coarse powder, medium powder, and fine powder to meet process requirements. It is foreseeable that by adjusting the airflow of the first negative pressure fan 500 and the second negative pressure fan 800, the proportion of material drawn from the middle discharge pipe 130 can be flexibly adjusted, thereby adjusting the output ratio of coarse powder, medium powder, and fine powder.

[0034] Reference Figures 1 to 2As shown, it can be understood that the intermediate discharge pipe 130 is equipped with a first iron separator 131, which is used to remove magnetic substances from the material passing through the intermediate discharge pipe 130. The first iron separator 131 directly removes iron from the material that has just left the disc mill 100 and is about to enter the classifier 200. Because magnetic substances have high hardness, they are very easy to wear the rotating parts in the classifier 200. The first iron separator 131 can effectively prevent magnetic substances from entering the classifier 200 and causing damage to the classifier 200. The coarse powder outlet pipe 210 is equipped with a second iron separator 211, which is used to remove magnetic substances from the material passing through the coarse powder outlet pipe 210. Iron removal is performed before the coarse powder enters the first receiving container 300, so that the coarse powder product meets the purity requirements. A third iron separator 410 is provided between the first dust collector 400 and the second receiving container 600. The third iron separator 410 is used to remove magnetic substances from the material discharged from the first dust collector 400. Iron removal is performed before the coarse powder enters the second receiving container 600, ensuring that the medium powder product meets the purity requirements. The first iron separator 131, the second iron separator 211, and the third iron separator 410 remove magnetic substances, thereby improving the purity of the final product.

[0035] Reference Figures 1 to 2 As shown, it can be understood that the intermediate discharge pipe 130 is connected to a compressed air source 132 to assist the material in passing through the intermediate discharge pipe 130. The intermediate discharge pipe 130 conveys medium powder from the middle of the disc mill 100. Due to its particle size characteristics, this type of material is prone to accumulation and blockage in the pipe, especially in the bends. Therefore, the compressed air source 132 is connected to the bends of the intermediate discharge pipe 130, injecting compressed air into the intermediate discharge pipe 130 intermittently or continuously. The compressed air acts as an active pushing force, working together with the negative pressure suction to push the stagnant material in the intermediate discharge pipe 130 toward the classifier 200, thereby improving the conveying efficiency.

[0036] Reference Figures 1 to 2As shown, it can be understood that the grading inlet pipe 230 is connected to the intermediate outlet pipe 130 via a first switching valve 900, and the second dust collector 700 is connected to a fine powder inlet pipe 420. The fine powder inlet pipe 420 is connected to the upper outlet pipe 120 via a second switching valve 910. The first switching valve 900 and the second switching valve 910 are connected via a bypass pipe 920. The first switching valve 900 and the second switching valve 910 are two-position three-way valves. It can be foreseen that the first switching valve 900 and the second switching valve 910 form a control valve group, which has a first state and a second state. When it is necessary to produce coarse, medium, and fine powder products simultaneously, the control valve group is in the first state, with the first switching valve 900 connecting the grading inlet pipe 230 to the intermediate outlet pipe 130, and the second switching valve 910 connecting the fine powder inlet pipe 420 to the upper outlet pipe 120. If uniform particle size is required and coarse and medium powders are not needed, the control valve assembly is in its second state. The first switching valve 900 connects the fine powder inlet pipe 420 to the bypass pipe 920, and the second switching valve 910 connects the upper outlet pipe 120 to the bypass pipe 920. The intermediate discharge pipe 130 no longer draws material from the middle of the disc mill 100. All material in the disc mill 100 is discharged through the upper outlet pipe 120 to the classifier 200 for screening, separating materials with the required particle size. Alternatively, the first switching valve 900 and the second switching valve 910 can be used to guide all material from the disc mill 100 into the classifier 200. The classifier 200 only separates the qualified fine powder; the coarse and medium powders are collected and re-introduced into the disc mill 100 for further grinding. The first switching valve 900 and the second switching valve 910 can switch production modes, improving production flexibility and adapting to different production requirements.

[0037] Reference Figures 1 to 2 As shown, it can be understood that the lower end of the first dust collector 400 is connected to a medium powder discharge valve 430, and the coarse powder outlet pipe 210 is connected to a coarse powder discharge valve 212. The lower end of the second dust collector 700 is connected to a fine powder discharge valve 720. The fine powder discharge valve 720, the medium powder discharge valve 430, and the coarse powder discharge valve 212 all use rotary valves, which achieve quantitative material discharge through impeller rotation, while preventing the negative pressure system from drawing in air and causing pressure imbalance. The specific structure of the rotary valve is existing technology and will not be described in detail.

[0038] Reference Figures 1 to 2As shown, it can be understood that a feeding mechanism 111 and a filter 112 are connected to the crushing feed pipe 110. The feeding mechanism 111 is a combination of a weighing scale and a screw feeder to uniformly feed the material to be ground into the disc mill 100. The filter 112 is located at the end of the crushing feed pipe 110 away from the disc mill 100. The filter 112 is open to the atmosphere. Outside air enters the crushing feed pipe 110 under negative pressure, pushing the material from the feeding mechanism 111 into the disc mill 100. The filter 112 is used to filter the air entering the crushing feed pipe 110, preventing impurities in the air from entering the disc mill 100 and improving the purity of the final powder product.

[0039] Reference Figures 1 to 2 As shown, it can be understood that the first receiving container 300, the second receiving container 600, and the third receiving container 710 are all ton bags. The ton bags automatically receive powder through gravity self-tensioning, and the ton bags containing powder can be directly conveyed and transferred by forklift without the need for other transfer equipment.

[0040] Reference Figures 1 to 2 As shown, it can be understood that the first dust collector 400 and the second dust collector 700 are bag filters. Bag filters have high dust removal efficiency, can thoroughly filter powder, and can discharge material continuously.

[0041] Reference Figures 1 to 2 As shown, it can be understood that the disc mill 100 includes a housing 101, a main shaft 102, a feed chamber 103, and a discharge chamber 104. The feed chamber 103 is connected to the crushing feed pipe 110, and the discharge chamber 104 is connected to the upper outlet pipe 120. The upper end of the housing 101 is connected to the discharge chamber 104, and the lower end of the housing 101 is connected to the feed chamber 103. The main shaft 102 is rotatably arranged inside the housing 101 along the axial direction of the housing 101. The portion of the main shaft 102 located inside the housing 101 is provided with multiple disc assemblies 105 along the axial direction of the main shaft 102. The lower end of the main shaft 102 is connected to a power component. The middle discharge pipe 130 is connected to the side wall of the housing 101. The height of the connection between the middle discharge pipe 130 and the housing 101 is greater than the height of the lowermost disc assembly 105 and less than the height of the uppermost disc assembly 105. The specific structures of the housing 101 and the disc assembly 105 are existing technologies and will not be described in detail. After the material enters the housing 101 from the feed hopper 103, it moves upward along the main shaft 102 and is progressively sheared, ground, and collided by the rotating multi-layer disc assembly 105, resulting in the material being crushed from coarse to fine particle size. The intermediate discharge pipe 130 is positioned at the middle stage of the crushing process and can extract medium-sized material that has undergone preliminary crushing by some of the disc assemblies 105 but has not yet reached its final fineness. Extracting some medium-sized material reduces the grinding load on the upper discs and can increase the material throughput per hour of the equipment.

[0042] Reference Figures 1 to 2 As shown, the power unit includes a motor 106, which is connected to the main shaft 102 via a pulley assembly 107 located at the lower end of the main shaft 102. The pulley assembly 107 is a flexible transmission method, which can buffer the instantaneous impact of the motor 106 on the main shaft 102 when it starts up and prevent the vibration of the main shaft 102 during the crushing process from affecting the motor 106. Furthermore, when the disc assembly 105 is jammed by a metal foreign object, the belt slippage can prevent the motor 106 from being overloaded and burned out.

[0043] Operating steps: When producing products in three specifications—coarse, medium, and fine powder—switch the control valve group to the first state. The first switching valve 900 connects the grading inlet pipe 230 to the intermediate outlet pipe 130, and the second switching valve 910 connects the fine powder inlet pipe 420 to the upper outlet pipe 120. Start the first negative pressure fan 500 and the second negative pressure fan 800, and then feed the material at a uniform speed through the feeding mechanism 111. Change the air volume of the first negative pressure fan 500 and the second negative pressure fan 800 to adjust the output ratio of coarse, medium, and fine powder. When only fine powder needs to be produced, stop feeding and let the disc mill 100 idle for 2 minutes. Then, turn off the second negative pressure fan 800, switch the control valve group to the second state, and connect the fine powder inlet pipe 420 to the bypass pipe 920 with the first switching valve 900. Connect the upper outlet pipe 120 to the bypass pipe 920 with the second switching valve 910. The middle discharge pipe 130 will no longer draw material from the middle of the disc mill 100. All the material in the disc mill 100 will be discharged through the upper outlet pipe 120 to the classifier 200 for screening, and the material with qualified particle size will be separated.

[0044] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A powder secondary classification device, characterized in that, include: A disc mill (100) is provided with a crushing feed pipe (110) at the lower end of the side wall of the disc mill (100) and an upper outlet pipe (120) at the upper end of the side wall of the disc mill (100). The material passes through the disc mill (100) from bottom to top and is gradually crushed. A middle discharge pipe (130) is provided in the middle of the side wall of the disc mill (100). A classifier (200) is connected to a coarse powder outlet pipe (210), a medium powder outlet pipe (220) and a classification inlet pipe (230). The classification inlet pipe (230) is connected to the intermediate discharge pipe (130), and the coarse powder outlet pipe (210) is connected to a first receiving container (300). The first dust collector (400) is connected to the medium powder outlet pipe (220). The outlet of the first dust collector (400) is connected to a first negative pressure fan (500). The first negative pressure fan (500) is used to generate a pressure difference to drive the powder in the disc mill (100) to flow to the first dust collector (400). The lower end of the first dust collector (400) is provided with a second receiving container (600). The second dust collector (700) is connected to the upper outlet pipe (120). The outlet of the second dust collector (700) is connected to a second negative pressure fan (800). The second negative pressure fan (800) is used to generate a pressure difference to drive the powder in the disc mill (100) to flow to the second dust collector (700). Both the first dust collector (400) and the second dust collector (700) are used to separate the crushed material. The lower end of the second dust collector (700) is provided with a third receiving container (710).

2. The powder secondary classification device according to claim 1, characterized in that: The intermediate discharge pipe (130) is equipped with a first iron remover (131), which is used to remove magnetic substances from the material passing through the intermediate discharge pipe (130). The coarse powder outlet pipe (210) is equipped with a second iron remover (211), which is used to remove magnetic substances from the material passing through the coarse powder outlet pipe (210). A third iron remover (410) is provided between the first dust collector (400) and the second receiving container (600), which is used to remove magnetic substances from the material discharged by the first dust collector (400).

3. The powder secondary classification device according to claim 1, characterized in that: The intermediate discharge pipe (130) is connected to a compressed air source (132) to assist the material in passing through the intermediate discharge pipe (130).

4. The powder secondary classification device according to claim 1, characterized in that: The graded inlet pipe (230) is connected to the intermediate outlet pipe (130) through a first switching valve (900). The second dust collector (700) is connected to a fine powder inlet pipe (420). The fine powder inlet pipe (420) is connected to the upper outlet pipe (120) through a second switching valve (910). The first switching valve (900) and the second switching valve (910) are connected through a bypass pipe (920). The first switching valve (900) and the second switching valve (910) are two-position three-way valves.

5. The powder secondary classification device according to claim 1, characterized in that: The lower end of the first dust collector (400) is connected to a medium powder discharge valve (430), the coarse powder outlet pipe (210) is connected to a coarse powder discharge valve (212), and the lower end of the second dust collector (700) is connected to a fine powder discharge valve (720).

6. The powder secondary classification device according to claim 1, characterized in that: The crushing feed pipe (110) is connected to a feeding mechanism (111) and a filter (112).

7. The powder secondary classification device according to claim 1, characterized in that: The first receiving container (300), the second receiving container (600) and the third receiving container (710) are all ton bags.

8. The powder secondary classification device according to claim 1, characterized in that: The first dust collector (400) and the second dust collector (700) are bag filters.

9. The powder secondary classification device according to claim 1, characterized in that: The disc mill (100) includes a housing (101), a main shaft (102), a feed chamber (103), and a discharge chamber (104). The upper end of the housing (101) is connected to the discharge chamber (104), and the lower end of the housing (101) is connected to the feed chamber (103). The main shaft (102) is rotatably arranged inside the housing (101) along the axial direction of the housing (101). The portion of the main shaft (102) located inside the housing (101) is provided with multiple disc assemblies (105) along the axial direction of the main shaft (102). The lower end of the main shaft (102) is connected to a power component. The intermediate discharge pipe (130) is connected to the side wall of the housing (101). The height of the connection between the intermediate discharge pipe (130) and the housing (101) is greater than the height of the lowermost disc assembly (105) and less than the height of the uppermost disc assembly (105).

10. The powder secondary classification device according to claim 9, characterized in that: The power component includes a motor (106), which is connected to the main shaft (102) via a pulley assembly (107) located at the lower end of the main shaft (102).

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