A graphite powder screening device

Abstract

The application discloses a graphite powder screening device, and relates to the technical field of screening devices, which comprises an outer cylinder, a plurality of first screen holes are formed in the outer cylinder to complete the screening of graphite powder, and an inner cylinder is arranged in the outer cylinder and can rotate along a second direction, wherein the first direction and the second direction are opposite. The graphite powder is lifted higher and the sliding path is longer through the extension of the surface of the fixed block containing the graphite powder when the sliding plate slides out of the inner part of the slide. The fixed block and the sliding plate occupy the screening surface space of the inner cylinder, the effective area of the free flow and screening of the graphite powder on the screening surface of the inner cylinder is reduced, the screening speed of the graphite powder by the inner cylinder is reduced, too much graphite powder is prevented from being accumulated between the inner cylinder and the outer cylinder, and the overall screening rate of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screening devices, in particular to a graphite powder screening device. BACKGROUND

[0002] The background technology of the graphite powder screening device mainly relates to the classification and screening of graphite powder to improve the application effect of graphite. In many industrial applications, the particle size distribution of graphite powder directly affects its performance and application field. For example, graphite powder is often used in the fields of batteries, lubricants, electronic materials, etc. The powder with smaller particle size has higher surface area and is more suitable for use as a material for high-performance batteries, while larger particles are suitable for conductive or lubricating purposes. Therefore, the improvement of the graphite powder screening technology is the focus of current research, especially how to improve the screening efficiency, reduce energy consumption, and maintain the screening accuracy.

[0003] In the prior art, two cylinder bodies with different sieve hole sizes are used as containers, the inner cylinder with a larger sieve hole is sleeved inside the outer cylinder with a smaller sieve hole, a plurality of fixed blocks are fixedly installed on the inner wall of the inner cylinder at equal intervals, then a certain amount of graphite powder is added, and the amount of powder added at one time is just enough to be completely received by the fixed blocks at the lowest point of the inner cylinder, and the two cylinder bodies are driven to slowly rotate in opposite directions to complete the screening of the graphite powder. Finally, the two cylinder bodies are tilted and the screened graphite powder is discharged by using a cylinder.

[0004] However, when using the device, the batch of graphite powder to be screened will be different, so the particle size will also be different. When there are more small particles of graphite powder inside the inner cylinder, the small particles of graphite powder will quickly fall into the inner cylinder through the screening of the inner cylinder. Since the screened graphite powder will accumulate near the bottom of the outer cylinder due to gravity, if the screening speed of the inner cylinder is greater than that of the outer cylinder, the graphite powder will accumulate in the narrow space between the inner cylinder and the outer cylinder. Since the accumulated graphite powder has poor flowability, the screening effect of the outer cylinder will be further reduced and the graphite powder will be further accumulated. When the accumulated graphite powder adheres to the outer wall of the inner cylinder, it will also block the screening of the inner cylinder, forming a vicious cycle and reducing the overall screening rate of the device. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a graphite powder screening device to solve the problems raised in the background art: a graphite powder screening device, comprising:

[0006] The outer cylinder can rotate around the first direction, and a plurality of first sieve holes are formed on the outer cylinder to complete the screening of the graphite powder;

[0007] An inner cylinder is disposed inside the outer cylinder. The inner cylinder is capable of rotating along a second direction, which is opposite to the first direction. The inner cylinder has a plurality of second sieve holes to complete the sieving of graphite powder. The diameter of the second sieve holes is larger than that of the first sieve holes. A plurality of fixing blocks are equidistantly arranged on the inner wall of the inner cylinder. The plurality of fixing blocks can hold the graphite powder inside the inner cylinder and can release the held graphite powder into the first sieving area K1 as the inner cylinder rotates. The fixing blocks have slides inside.

[0008] Two mounting plates are symmetrically installed on the outer wall of the inner cylinder;

[0009] Several pushing components are installed between two mounting plates. The pushing components can rotate with the inner cylinder and push the graphite powder inside the outer cylinder when the graphite powder reaches a set height, so that the accumulated graphite powder flows.

[0010] Several slide plates are disposed inside the slide rail. The slide plates are coupled to a push assembly. The slide plates are configured to move toward the central axis of the inner cylinder when the push assembly is subjected to the extrusion force of graphite powder, so that the graphite powder is released in the second screening area K2.

[0011] Preferably, the pushing component and the slide are connected by a connecting pipe to achieve coupling between the pushing component and the slide plate, and the connecting pipe passes through the inner cylinder.

[0012] Preferably, the actuating component includes:

[0013] An air tube passes through two mounting plates and is fixed to the two mounting plates. One end of the air tube has an opening. One end of the connecting tube is connected to the air tube through the opening. An air hole is provided on the air tube.

[0014] An airbag is fixedly installed on the trachea, and the airbag is connected to an air hole.

[0015] Preferably, the inner wall of the inner cylinder is provided with a plurality of friction strips.

[0016] Preferably, one end of the fixing block is provided with an air passage, the air passage is connected to the slide, the connecting pipe is fixed to the fixing block, and the other end of the connecting pipe is connected to the slide through the air passage.

[0017] Preferably, the outer surface of the slide plate near the inner wall of the inner cylinder has two mounting grooves. Each mounting groove contains a limiting component to restrict the position of the slide plate, which supports and maintains the position of the slide plate before the angle between the slide plate and the horizontal plane reaches 80°. The limiting component includes:

[0018] A housing is fixedly installed in a mounting slot, and a cavity is provided inside the housing;

[0019] An elastic element, which is installed inside the cavity;

[0020] A gravity block, which is connected to an elastic element, is capable of sliding along the cavity;

[0021] A rotating plate is rotatably installed in a mounting groove, with the gravity block abutting against the surface of one side of the rotating plate, and one end of the rotating plate abutting against the friction belt.

[0022] Preferably, the elastic element is a spring, and the two ends of the spring are fixed to the shell and the gravity block, respectively.

[0023] Preferably, the trachea has two turntables symmetrically and rotatably connected, the airbag is fixedly installed between the two turntables, and the trachea is placed inside the airbag.

[0024] Preferably, a plurality of support rods are fixedly connected between the two turntables, and the support rods can support the airbag.

[0025] Preferably, multiple limiting rods are fixedly installed on the outer surface of the slide plate near the inner wall of the inner cylinder, and the limiting rods can restrict the position of the slide plate inside the slide track.

[0026] This invention extends the surface of the fixed block holding graphite powder by having a sliding plate slide out from inside the slideway. This allows the graphite powder to be lifted higher and its sliding path to be longer. By setting the fixed block and sliding plate to occupy the screening surface space of the inner cylinder, the effective area for free flow and screening of graphite powder on the inner cylinder screen surface is reduced. This reduces the screening speed of graphite powder in the inner cylinder, avoids excessive accumulation of graphite powder between the inner and outer cylinders, and ensures the overall screening rate of the device. Attached Figure Description

[0027] Figure 1 This is an axial view of the present invention;

[0028] Figure 2 This is a perspective view of the present invention;

[0029] Figure 3 This is a rear view of the present invention;

[0030] Figure 4 This is a cross-sectional view of the outer cylinder of the present invention;

[0031] Figure 5 This is a cross-sectional view of the inner cylinder of the present invention;

[0032] Figure 6 This is a partial cross-sectional view of the present invention;

[0033] Figure 7 This is a partial exploded view of the present invention;

[0034] Figure 8This is a partial bottom view of the present invention;

[0035] Figure 9 This is a structural diagram of the component driving the present invention;

[0036] Figure 10 This is a cross-sectional view of the fixing block of the present invention;

[0037] Figure 11 This is a partial cross-sectional view of the limiting component of the present invention;

[0038] Figure 12 This is a schematic diagram of the material feeding process for the sliding plate of the present invention;

[0039] Figure 13 This is a schematic diagram of the gravity block of the present invention.

[0040] Figure label:

[0041] 100. Outer cylinder;

[0042] 200. Inner cylinder; 210. Friction belt;

[0043] 300. Mounting plate;

[0044] 400. Pushing component; 410. Air tube; 411. Air port; 420. Turntable; 430. Support rod; 440. Airbag;

[0045] 500. Fixing block; 510. Slide rail; 520. Air passage;

[0046] 600. Connecting pipe;

[0047] 700, Slide plate; 710, Limiting rod; 720, Mounting slot;

[0048] 800, Limiting component; 810, Housing; 820, Rotating plate; 830, Gravity block; 840, Elastic element;

[0049] K1, the first screening area; K2, the second screening area. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] like Figure 5As shown, to address the problem of graphite powder accumulating between the outer cylinder 100 and the inner cylinder 200 and affecting the sieving rate, this application provides a graphite powder sieving device, including: an outer cylinder 100, an inner cylinder 200, two mounting plates 300, several pushing components 400, and several sliding plates 700. Figure 1 and Figure 6 As shown, the outer cylinder 100 is driven by an external driving structure to rotate along a first direction, and the inner cylinder 200 is driven by an external driving structure to rotate along a second direction. The first and second directions are opposite. The outer cylinder 100 has several first sieve holes to sieve the graphite powder, and the inner cylinder 200 has several second sieve holes to sieve the graphite powder. The diameter of the second sieve holes is larger than that of the first sieve holes; the diameter of the first sieve holes is approximately 1.5 mm, and the diameter of the second sieve holes is approximately 3 mm. Figure 2 As shown, the operator uses a conveyor to add a fixed amount of graphite powder into the inner cylinder 200 through the feeding port at one end. The rotation of the inner cylinder 200 sieves the graphite powder, and the graphite particles inside pass through the second sieve holes on the inner cylinder 200 into the outer cylinder 100. Then, the rotation of the outer cylinder 100 causes the first sieve holes on its surface to sieve the graphite powder again. A collection box is installed on the outside of the outer cylinder 100 to collect the sieved graphite powder. After sieving, as... Figure 3 As shown, the outer cylinder 100 and the inner cylinder 200 are lifted by a hydraulic telescopic rod, so that the large-particle graphite powder raw material screened out inside is discharged from the port at the other end of the inner cylinder 200 and the outer cylinder 100. This device can perform multi-stage screening of graphite powder.

[0052] Because the inner cylinder 200 contains a large amount of large graphite powder particles, which are heavy and have large inter-particle gaps, they mainly rely on gravity to roll or slide along the screen surface within the inner cylinder 200. This movement is relatively simple and slow, causing the graphite powder inside to easily accumulate, resulting in slow screening efficiency. Figure 6 As shown, to ensure high screening speed in the inner cylinder 200, multiple fixed blocks 500 are equidistantly installed on the inner wall of the inner cylinder 200. These fixed blocks 500 can hold the graphite powder inside the inner cylinder 200. As the inner cylinder 200 rotates, the graphite powder is lifted by the fixed blocks 500 to a height exceeding its natural angle of repose, at which point it is thrown or slid off the fixed blocks 500, releasing the held graphite powder into the first screening area K1. This forced lifting-throwing action significantly increases the contact opportunity between graphite powder particles and the second sieve holes on the inner cylinder 200, greatly accelerating the speed at which small particles pass through the second sieve holes, thereby improving the screening efficiency of the inner cylinder 200. It should be noted that the amount of graphite powder added quantitatively in this scheme can be completely contained by two fixed blocks 500 at once, avoiding excessive accumulation that could affect the screening efficiency of the inner cylinder 200.

[0053] If the screening efficiency of the inner cylinder 200 is high, but the screening efficiency of the outer cylinder 100 cannot keep up, the graphite powder particles screened from the inner cylinder 200 will accumulate inside the gap between the outer cylinder 100 and the inner cylinder 200. When the graphite powder particles accumulate too high inside the gap, they are squeezed together, and the flowability of the graphite powder particles in the outer cylinder 100 becomes poor, making it more difficult for them to be screened out by the outer cylinder 100. Figure 6 As shown, to maintain a gap between the outer cylinder 100 and the inner cylinder 200, two mounting plates 300 are symmetrically fixedly installed on the outer wall of the inner cylinder 200. Several pushing components 400 are installed between the two mounting plates 300. The pushing components 400 can rotate with the inner cylinder 200 and push the graphite powder inside the outer cylinder 100 when it reaches a set height (the set height is the distance between the pushing component 400 and the inner wall of the outer cylinder 100, which can be adjusted during device design according to actual conditions), causing the accumulated graphite powder to flow. Figure 7 As shown, the specific pushing component 400 includes: an air pipe 410 and an air bag 440. The air pipe 410 passes through two mounting plates 300 and is fixedly connected to the two mounting plates 300. The air bag 440 is fixedly installed on the air pipe 410. When the inner cylinder 200 rotates, the two mounting plates 300 drive the air pipe 410 to rotate around the central axis of the inner cylinder 200. The air pipe 410 drives the air bag 440 to move. When the two move to the bottom of the outer cylinder 100, they can push away the graphite powder accumulated at the bottom of the outer cylinder 100, so that there is a fixed gap between the graphite powder accumulated at the bottom of the outer cylinder 100 and the outer wall of the inner cylinder 200, so that the graphite powder inside the outer cylinder 100 has space to flow, ensuring that it can sieve the graphite powder.

[0054] To adjust the screening efficiency of the inner cylinder 200 to match that of the outer cylinder 100, ensuring the graphite powder thickness between the inner cylinder 200 and the outer cylinder 100 is within a reasonable range, such as... Figure 7 and Figure 10 As shown, a slide 510 is provided inside the fixed block 500. A sliding plate 700 is disposed inside the slide 510 and slidably mounted against the inner wall of the slide 510. The sliding plate 700 is coupled to the pushing component 400. The sliding plate 700 is configured to move towards the central axis of the inner cylinder 200 when the pushing component 400 is subjected to the extrusion force of graphite powder. The sliding plate 700 slides out from inside the slide 510, extending the surface of the fixed block 500 that holds the graphite powder, thereby lifting the graphite powder higher and extending its falling path. Figure 12As shown, the graphite powder is released into the second screening area K2, which has a smaller area than the first screening area K1. By setting the fixed block 500 and the slide plate 700 to occupy the screening surface space of the inner cylinder 200, the effective area for free flow and screening of graphite powder on the screen surface of the inner cylinder 200 is reduced, thereby reducing the screening speed of graphite powder in the inner cylinder 200 and avoiding excessive accumulation of graphite powder between the inner cylinder 200 and the outer cylinder 100, thus ensuring the overall screening rate of the device.

[0055] In order to push component 400 under further compression, the sliding plate 700 will move towards the central axis of the inner cylinder 200, such as... Figure 8 and Figure 10 As shown, the push assembly 400 and the slide 510 are connected by a connecting pipe 600 to achieve coupling between the push assembly 400 and the slide plate 700. The connecting pipe 600 passes through the inner cylinder 200. One end of the air pipe 410 has an opening, and the other end of the connecting pipe 600 is connected to the air pipe 410 through the opening. The air pipe 410 has an air hole 411, and the airbag 440 is connected to the air hole 411. One end of the fixing block 500 has an air passage 520, which is connected to the slide 510. The connecting pipe 600 is fixed to the fixing block 500, and the other end of the connecting pipe 600 is connected to the slide 510 through the air passage 520. When the height of the graphite powder between the inner cylinder 200 and the outer cylinder 100 exceeds the height of the airbag 440, the excessively tall graphite powder particles will slowly compress the airbag 440 as the airbag 440 moves with the rotation of the inner cylinder 200. The air filled inside the airbag 440 will enter the air pipe 410 through the air hole 411, and then enter the slide 510 through the connecting pipe 600 and the air passage 520. Due to the entry of air, the volume of the slide 510 will increase, thereby pushing the slide plate 700 out of the slide 510, thus extending the area of ​​the fixed block 500 that holds the graphite powder.

[0056] When the slide plate 700 extends from the inside of the slide rail 510, in order to ensure that the graphite powder on its surface can slide off completely before retracting into the slide rail 510, as follows: Figure 11As shown, two mounting grooves 720 are formed on the outer surface of the slide plate 700 near the inner wall of the inner cylinder 200. A limiting component 800 is provided within the mounting groove 720 to restrict the position of the slide plate 700. This component supports and maintains the position of the slide plate 700 before the angle between the slide plate 700 and the horizontal plane reaches 80°. The limiting component 800 includes: a housing 810, an elastic element 840, a gravity block 830, and a rotating plate 820. The housing 810 is fixedly installed within the mounting groove 720. The housing 810 has an internal cavity with its opening facing the rotating plate 820. The elastic element 840 is a spring installed within the cavity. The gravity block 830 is connected to the elastic element 840 and can slide along the cavity. The two ends of the spring are fixed to the housing 810 and the gravity block 830, respectively. The rotating plate 820 is rotatably installed within the mounting groove 720. The inner wall of the inner cylinder 200 is provided with several friction strips 210, such as... Figure 13 As shown in Figure I, when the gravity block 830 is subjected to the elastic force of the spring, one end of the gravity block 830 abuts against the surface of one side of the rotating plate 820, causing one end of the rotating plate 820 to abut against the outer surface of the friction belt 210. A frictional resistance is generated between the rotating plate 820 and the friction belt 210. This resistance prevents the slide plate 700 from falling back along the slide rail 510, thus maintaining its extended state. Furthermore, when the slide plate 700 is in the area below the inner cylinder 200, it also experiences gravity and tends to fall downwards. At this time, the gravity block 830 is also subjected to its own downward gravity, which, together with the elastic force of the spring, acts on the rotating plate 820, increasing the force it experiences and thus generating greater frictional resistance. It should be noted that to ensure sufficient frictional resistance between the rotating plate 820 and the friction belt 210, the surface roughness of the contact surface between the friction belt 210 and the rotating plate 820 is Ra 3.2.

[0057] During actual use, operators noticed that the outer surface of airbag 440 frequently cracked. After long-term observation and verification, operators discovered that the surface of part of airbag 440 was worn away by graphite powder particles, causing the surface of airbag 440 to gradually wear thin and become compressed, eventually leading to cracking. Therefore, in further solutions, such as... Figure 9As shown, two turntables 420 are symmetrically and rotatably connected to the air tube 410. The airbag 440 is fixedly installed between the two turntables 420, and the air tube 410 is located inside the airbag 440. This arrangement changes the connection between the airbag 440 and the air tube 410 from a fixed connection to a rotatable connection. When the airbag 440 comes into contact with graphite powder particles and is squeezed, the airbag 440 will rotate around the central axis of the air tube 410 due to the resistance of the graphite powder particles. At this time, the entire outer surface of the airbag 440 will be in contact with the graphite powder particles, thereby greatly improving the service life of the airbag 440. It should be noted that the outer surfaces of the airbag 440 and the inner cylinder 200 are flat, so that when the graphite powder is pushed, a large amount of graphite powder will not leak out from the gap between the two. Since the airbag 440 can rotate, a small amount of graphite powder particles trapped between it and the outer surface of the inner cylinder 200 can be rotated out, which makes it easier to clean the graphite powder between the airbag 440 and the inner cylinder 200.

[0058] Because the graphite powder particles are unevenly distributed inside the outer cylinder 100, the resistance experienced at both ends of the airbag 440 may differ, causing different rotational speeds and resulting in torsion. This leads to excessive air being forced into the slide 510 from inside the airbag 440. Simultaneously, the torsional deformation of the airbag 440 can easily block the air vents 411, preventing air circulation inside the airbag 440. To solve these two problems, such as... Figure 9 As shown, several support rods 430 are fixedly connected between the two turntables 420. The support rods 430 can support the airbag 440. When the airbag 440 is subjected to uneven resistance, it can still maintain its normal shape and can only be squeezed and deformed, but cannot be twisted and deformed. At the same time, by supporting the airbag 440 with several support rods 430, the airbag 440 can be prevented from being excessively squeezed and deformed and bursting. Furthermore, when the graphite powder particles between the inner cylinder 200 and the outer cylinder 100 cannot be adjusted, the airbag 440 will contact the support rods 430, thereby causing the support rods 430 to forcibly push away the excess graphite powder particles, leaving a minimum gap between the inner cylinder 200 and the outer cylinder 100. At this time, even if the screening efficiency of the outer cylinder 100 decreases, it will not block the second sieve hole of the inner cylinder 200, so that the device still has a screening effect.

[0059] Because the skateboard 700 can slide inside the slide rail 510, to prevent the skateboard 700 from blocking the air passage 520, such as Figure 7 and Figure 10 As shown, multiple limiting rods 710 are fixedly installed on the outer surface of the slide plate 700 near the inner wall of the inner cylinder 200. The limiting rods 710 can limit the position of the slide plate 700 inside the slide rail 510, and when the slide plate 700 moves to an angle with the horizontal plane exceeding 80°, such as... Figure 13As shown in Figure II, the gravity of the weight block 830 is downward, thus compressing the spring and greatly reducing the force exerted by the weight block 830 on the rotating plate 820. At this time, the frictional resistance between the rotating plate 820 and the friction belt 210 is also greatly reduced. When this frictional resistance is reduced to the point where it can no longer support the extension of the slide plate 700, under the recovery of the airbag 440, air will return from the inside of the slide rail 510 to the inside of the airbag 440. At this time, the slide plate 700 will retract into the inside of the slide rail 510, thereby causing the limiting rod 710 to strike the inner wall of the inner cylinder 200. Because the slide plate 700 is at a position where the angle between the slide plate and the horizontal plane exceeds 80°, such as... Figure 6 As shown, the slide plate 700 is located in the space above the inner cylinder 200. Therefore, when the slide plate 700 drives the limiting rod 710 to hit the inner wall of the inner cylinder 200, it can vibrate out the graphite powder particles inside the second sieve hole above the inner cylinder 200, preventing them from clogging the second sieve hole and ensuring the screening effect of the inner cylinder 200.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A graphite powder sieving device, characterized in that, include: The outer cylinder (100) is capable of rotating along a first direction, and the outer cylinder (100) is provided with a plurality of first sieve holes to complete the sieving of graphite powder; An inner cylinder (200) is disposed inside an outer cylinder (100). The inner cylinder (200) is capable of rotating along a second direction, which is opposite to the first direction. The inner cylinder (200) has several second sieve holes to complete the sieving of graphite powder. The diameter of the second sieve hole is larger than that of the first sieve hole. Multiple fixing blocks (500) are equidistantly arranged on the inner wall of the inner cylinder (200). The multiple fixing blocks (500) can hold the graphite powder inside the inner cylinder (200) and release the held graphite powder into the first sieving area (K1) as the inner cylinder (200) rotates. A slide (510) is provided inside the fixing block (500). Two mounting plates (300) are symmetrically mounted on the outer wall of the inner cylinder (200); A plurality of pushing components (400) are installed between two mounting plates (300). The pushing components (400) can rotate with the inner cylinder (200) and push the graphite powder inside the outer cylinder (100) when the graphite powder reaches a set height, so that the accumulated graphite powder flows. Several slide plates (700) are disposed inside the slide rail (510). The slide plates (700) are coupled to the push assembly (400). The slide plates (700) are configured to move toward the central axis of the inner cylinder (200) when the push assembly (400) is subjected to the extrusion force of graphite powder, so that the graphite powder is released in the second screening area K2. The pushing component (400) and the slide rail (510) are connected by a connecting pipe (600) to achieve coupling between the pushing component (400) and the slide plate (700). The connecting pipe (600) passes through the inner cylinder (200). The pushing component (400) includes: An air tube (410) passes through two mounting plates (300) and is fixed to the two mounting plates (300). One end of the air tube (410) is provided with an opening. One end of the connecting pipe (600) is connected to the air tube (410) through the opening. An air hole (411) is provided on the air tube (410). An airbag (440) is fixedly installed on an air tube (410), and the airbag (440) is connected to an air hole (411); The inner wall of the inner cylinder (200) is provided with several friction strips (210). One end of the fixing block (500) is provided with an air passage (520), which is connected to the slide rail (510). The connecting pipe (600) is fixed to the fixing block (500), and the other end of the connecting pipe (600) is connected to the slide rail (510) through the air passage (520). The outer surface of the sliding plate (700) near the inner wall of the inner cylinder (200) is provided with two mounting grooves (720). The mounting grooves (720) are provided with limiting components (800) that limit the position of the sliding plate (700). The limiting components (800) can support the sliding plate (700) and maintain its position before the angle between the sliding plate (700) and the horizontal plane reaches 80°. The limiting components (800) include: A housing (810) is fixedly installed in a mounting groove (720), and a cavity is provided inside the housing (810); The elastic element (840) is installed inside the cavity; A gravity block (830) is connected to an elastic element (840), and the gravity block (830) is capable of sliding along the cavity; A rotating plate (820) is rotatably installed in a mounting groove (720), and a gravity block (830) abuts against the surface of one side of the rotating plate (820). One end of the rotating plate (820) abuts against a friction strip (210).

2. The graphite powder sieving device according to claim 1, characterized in that, The elastic element (840) is a spring, and the two ends of the spring are fixed to the housing (810) and the gravity block (830) respectively.

3. The graphite powder sieving device according to claim 1, characterized in that, The trachea (410) is symmetrically and rotatably connected to two turntables (420), the airbag (440) is fixedly installed between the two turntables (420), and the trachea (410) is located inside the airbag (440).

4. The graphite powder sieving device according to claim 3, characterized in that, A number of support rods (430) are fixedly connected between the two turntables (420), and the support rods (430) can support the airbag (440).

5. The graphite powder sieving device according to claim 1, characterized in that, Multiple limiting rods (710) are fixedly installed on the outer surface of the slide plate (700) near the inner wall of the inner cylinder (200). The limiting rods (710) can restrict the position of the slide plate (700) inside the slide rail (510).

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