Special graphite preparation secondary grinding powder grading device

Abstract

The utility model relates to the technical field of carbon product production technology provides a kind of secondary grinding powder grading device of special graphite preparation, including grinding machine, feed bin, classifier one, classifier two, bin group one, classifier three, bin group two, cloth bag dust collector, bin group three, batching scale, mixer, fan and exhaust cylinder, grinding machine is communicated with feed bin and classifier one respectively, classifier one is communicated with classifier two, classifier two is communicated with classifier three, classifier three is communicated with cloth bag dust collector, the utility model uses the design of grinding machine and classifier one, classifier two, classifier three are used simultaneously, while supporting the increase of classifier and bin group, and screen separator can be additionally provided between classifier and bin group. This design makes the device can produce different particle size powder, and can further expand the particle size range, the addition of screen separator further improves the classification accuracy, so as to meet the diversified production needs of different particle size powder.

Description

Technical Field

[0001] This utility model relates to the field of carbon product manufacturing technology, and in particular to a special graphite preparation secondary grinding and grading device. Background Technology

[0002] As a crucial step in isostatic pressing graphite production, the powder must be loaded into the mold sleeve. The loading effect directly impacts the product's shape and internal homogeneity. Poor internal homogeneity can lead to stress concentration during subsequent heat treatments such as calcination and graphitization, or during application, due to inconsistent shrinkage and expansion, resulting in product defects or application failure.

[0003] Regarding the secondary processing of the paste, after secondary grinding, the paste is stored in a silo, then sieved and mixed. After mixing, it is loaded into ton bags, mobile silos, fixed silos, etc., and finally directly fed into the mold sleeve. However, there are many problems in current production:

[0004] First, the secondary grinding and sieving mixing processes are operated separately, lacking coordination, which leads to low production efficiency.

[0005] Secondly, the processes of pressing powder and bagging are mostly done manually, which further reduces production efficiency;

[0006] Third, the fixed characteristics such as the particle size of the pressed powder cannot be adjusted according to demand, which is not conducive to process optimization and ensuring batch stability. Utility Model Content

[0007] The purpose of this invention is to provide a special graphite preparation secondary grinding and gradation device, which solves the above-mentioned problems by using this device.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a special graphite preparation secondary grinding and grading device, including a grinding mill, a feeding hopper, a classifier I, a classifier II, a silo group I, a classifier III, a silo group II, a bag filter, a silo group III, a batching scale, a mixer, a fan, and an exhaust stack. The grinding mill is connected to the feeding hopper and the classifier I, the classifier I is connected to the classifier II, the classifier II is connected to the classifier III, the classifier III is connected to the bag filter, the bag filter is connected to the fan, the fan is connected to the exhaust stack, the classifier II is connected to the silo group I, the classifier III is connected to the silo group II, the bag filter is connected to the silo group III, the silo group I, the silo group II, and the silo group III are connected to the batching scale, and the batching scale is connected to the mixer.

[0009] Preferably, control valve one and control valve two are installed between the fan and the exhaust stack.

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

[0011] 1. This utility model provides a special graphite preparation secondary grinding and grading device. The device adopts a design that combines a grinding mill with three classifiers (Classifier 1, Classifier 2, and Classifier 3), and also supports the addition of classifiers and silo groups. A screening machine can be added between the classifiers and the silo groups. This design enables the device to produce powders of different particle sizes and further expands the particle size range. The addition of the screening machine further improves the grading accuracy, thereby meeting the diversified production needs for powders of different particle sizes.

[0012] 2. This utility model provides a special graphite preparation secondary grinding and grading device, in which classifier one, classifier two, classifier three, and a bag filter are respectively connected to silo group one, silo group two, and silo group three to form a silo group storage structure. This design allows the powder produced by each sorting component to enter the corresponding silo group, enabling the device to flexibly respond to different production process arrangements and adapt to changing production requirements.

[0013] 3. This utility model provides a special graphite preparation secondary grinding and grading device. Different particle sizes of powder are batched according to the process ratio by a batching scale and then mixed in a mixer. Simultaneously, the particle size is controlled by setting the parameters of classifiers one, two, and three. This combination ensures controllable powder pressing parameters and uniform mixing, guaranteeing that the powder pressing meets process quality requirements and providing high-quality raw materials for subsequent loading and molding.

[0014] 4. This utility model provides a special graphite preparation secondary grinding and grading device. The grinding mill adopts a semi-open air path, and the air path condition is adjusted with control valve one and control valve two. At the same time, the classifier and silo group can be added as needed. This design can optimize the dust-laden air circulation and exhaust gas emission process, and facilitates the expansion of particle size classification capabilities according to production needs, allowing the device to better adapt to production changes and facilitating subsequent upgrades and modifications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the secondary grinding and grading device of this utility model.

[0016] The following are the labels in the attached diagram: 1. Grinding mill; 11. Feed hopper; 2. Classifier 1; 3. Classifier 2; 31. Silo group 1; 4. Classifier 3; 41. Silo group 2; 5. Bag filter; 51. Silo group 3; 6. Batching scale; 7. Mixer; 8. Fan; 81. Control valve 1; 82. Control valve 2; 9. Exhaust stack. Detailed Implementation

[0017] 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.

[0018] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0019] Combination Figure 1 As shown, this utility model discloses a special graphite preparation secondary grinding and grading device, including a grinding mill 1, a feeding hopper 11, a classifier 1 2, a classifier 2 3, a hopper group 1 31, a classifier 3 4, a hopper group 2 41, a bag filter 5, a hopper group 3 51, a batching scale 6, a mixer 7, a fan 8, and an exhaust stack 9. The grinding mill 1 is connected to the feeding hopper 11 and the classifier 1 2. The classifier 1 2 is connected to the classifier 2 3. The classifier 2 3 is connected to the classifier 3 4. The classifier 3 4 is connected to the bag filter 5. The bag filter 5 is connected to the fan 8. The fan 8 is connected to the exhaust stack 9. The classifier 2 3 is connected to the hopper group 1 31. The classifier 3 4 is connected to the hopper group 2 41. The bag filter 5 is connected to the hopper group 3 51. The hopper group 1 31, the hopper group 2 41, and the hopper group 3 51 are connected to the batching scale 6. The batching scale 6 is connected to the mixer 7.

[0020] Control valve 81 and control valve 82 are installed between the fan 8 and the exhaust pipe 9.

[0021] Specifically,

[0022] The grinding mill 1 is not limited to any type, and can be an impact mill, Raymond mill, vertical mill, etc. The main unit is 30~300kw, the classifier is 2~20kw, and the frequency is adjustable;

[0023] The power of fan 8 is 50~300kw, and the frequency is adjustable;

[0024] The classifier's rotation speed is adjustable from 100 to 3000 rpm. The higher the rotation speed, the finer the powder that can pass through.

[0025] A screening device can be added between the classifier and the silo group, with a screening capacity of 200~3000 kg / h;

[0026] The number of silo groups is 1 to 6, and the volume of each silo is 1 to 30 m³.

[0027] The batching scale 6 has a measuring range of 1~20t;

[0028] The effective volume of mixer 7 is 3~30m³.

[0029] Working principle:

[0030] First, the paste particles in the feed hopper 11 are fed into the grinding mill 1 for grinding. After being ground into powder, the powder is lifted to the classifier 2 built into the grinding mill 1 under the negative pressure generated by the blower 8. Under the centrifugal force generated by the classifier 2, the coarse powder particles fall into the grinding mill 1 for further grinding, while the fine powder particles pass smoothly through the classifier 2 and go to the classifier 3.

[0031] After the fine powder particles reach classifier 2 (3), under the action of centrifugal force, the coarser portion falls into hopper group 31, while the finer portion passes smoothly through classifier 2 (3) and goes to classifier 3 (4). Similarly, among the powder going to classifier 3 (4), the coarser portion falls into hopper group 2 (41), while the ultrafine powder that passes smoothly through classifier 3 (4) is collected by bag filter dust collector 5 and enters hopper group 3 (51).

[0032] Because the powder in silo group 1 (31), silo group 2 (41), and silo group 3 (51) is progressively finer according to the different parameter settings of classifiers 1 (2), 2 (3), and 3 (4), different particle sizes of powder are formed. These different particle sizes of powder are batched according to the process requirements using batching scale 6, and then fed into mixer 7. After mixing, the powder is pressed and ready for subsequent filling and molding.

[0033] In addition, the exhaust gas generated after the dust-laden air is filtered by the bag filter 5 will enter the control valve 81 and control valve 82 through the fan 8. The air volume passing through the exhaust stack 9 is controlled by these two control valves, and the remaining exhaust gas is returned to the grinding mill 1 to continue to participate in the circulation.

[0034] Control valve 2 82 is connected to the grinding mill 1 via a pipeline. Control valve 2 82 and control valve 1 81 are set with different opening degrees to realize the internal circulation air path, open air path, and semi-open air path of the air path system of grinding mill 1. When control valve 1 81 is closed or slightly open and control valve 2 82 is fully open, the air path is an internal circulation air path. The flowing gas generated by the fan 8 circulates within the grinding mill 1 system, which is beneficial to increasing the temperature of the grinding mill 1 system. When control valve 1 81 is fully open and control valve 2 82 is closed, it is an open air path. The gas discharged by the fan 8 mainly enters the atmosphere through the exhaust pipe 9, which is beneficial to reducing the temperature of the grinding mill 1 system and ensuring the stability of the air volume. When both control valve 1 81 and control valve 2 82 are in the open state, part of the gas generated by the fan 8 is discharged through the exhaust pipe 9 and part is returned to the grinding mill 1 through control valve 2 82, which is a semi-open air path that combines the characteristics of an open air path and an internal circulation air path.

[0035] Example

[0036] Case 1: The powder produced by classifier 2 (3) has a D50 of 40μm, the pressed powder produced by classifier 3 (4) has a D50 of 20μm, and the pressed powder produced by bag filter 5 has a D50 of 5μm. The three materials are mixed in a ratio of 8:2:0, and the resulting mixed pressed powder has a D50 of about 36μm, with more coarse powder and less fine powder.

[0037] Case 2: The powder produced by classifier 2 (3) has a D50 of 40μm, the pressed powder produced by classifier 3 (4) has a D50 of 20μm, and the pressed powder produced by bag filter 5 has a D50 of 5μm. The three materials are mixed in a ratio of 7:2:1, and the resulting mixed pressed powder has a D50 of about 32μm, with a high content of coarse powder and a small amount of fine powder.

[0038] Case 3: The powder produced by classifier 2 (3) has a D50 of 30μm, the pressed powder produced by classifier 3 (4) has a D50 of 20μm, and the pressed powder produced by bag filter 5 has a D50 of 3μm. The three materials are mixed in a ratio of 3:6:1, and the resulting mixed pressed powder has a D50 of approximately 21μm, with a low content of coarse and fine powder and a high content of medium-sized particles.

[0039] Case 4: The powder produced by classifier 2 (3) has a D50 of 30μm, the pressed powder produced by classifier 3 (4) has a D50 of 20μm, and the pressed powder produced by bag filter 5 has a D50 of 3μm. The three materials are mixed in a ratio of 1:9:0, and the resulting mixed pressed powder has a D50 of about 21μm. The coarse powder content is relatively low, the medium-sized particles account for the majority, and the fine powder content is extremely low.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A special graphite preparation secondary grinding and grading device, characterized in that, The system includes a grinding mill (1), a feeding hopper (11), a classifier 1 (2), a classifier 2 (3), a hopper group 1 (31), a classifier 3 (4), a hopper group 2 (41), a bag filter (5), a hopper group 3 (51), a batching scale (6), a mixer (7), a fan (8), and an exhaust stack (9). The grinding mill (1) is connected to the feeding hopper (11) and the classifier 1 (2) respectively. The classifier 1 (2) is connected to the classifier 2 (3), and the classifier 2 (3) is connected to the classifier 3 (4). The third classifier (4) is connected to the bag filter (5), the bag filter (5) is connected to the fan (8), the fan (8) is connected to the exhaust stack (9), the second classifier (3) is connected to the first silo group (31), the third classifier (4) is connected to the second silo group (41), the bag filter (5) is connected to the third silo group (51), the first silo group (31), the second silo group (41) and the third silo group (51) are connected to the batching scale (6), and the batching scale (6) is connected to the mixer (7).

2. The special graphite preparation secondary grinding and grading device according to claim 1, characterized in that: Control valve one (81) and control valve two (82) are provided between the fan (8) and the exhaust pipe (9).

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