A graphite powder ultrasonic screening device and screening method thereof

Abstract

The present invention relates to the field of graphite powder screening, and in particular to a graphite powder ultrasonic screening device and a screening method thereof, comprising an outer cylinder, wherein a first screening tube is eccentrically arranged in the outer cylinder, and first eccentric tubes are connected to both ends of the first screening tube, the first eccentric tube rotates coaxially with the outer cylinder, one end of the outer cylinder is provided with a feeder connected to the first screening tube, the other end of the outer cylinder is provided with a first discharge tube connected to the first screening tube, and the surface of the outer cylinder is provided with a second discharge tube connected to the gap between the first screening tube and the outer cylinder, the first screening tube comprises a rubber tube, and the rubber tube is tensioned. The present invention adopts an elastically tensioned rubber tube, and intermittently introduces gas in an eccentric rotating state to make it vibrate at high frequency for screening graphite powder. The entire screening process maintains linear conduction of the graphite powder in the tube, the continuity of the screening process is better, and the graphite powder can be conveniently isolated from contact with the external environment, so as to avoid the graphite powder being mixed with dust and also avoid the graphite powder from entering the external environment.

Description

Technical Field

[0001] The invention relates to the field of graphite powder screening, in particular to a graphite powder ultrasonic screening device and a screening method thereof. Background Art

[0002] Graphite powder is used in refractory materials, conductive materials, lubricating materials, etc. The different particle sizes of graphite powder have a more obvious impact on its application. In order to maximize the role of graphite powder, it is necessary to screen the graphite powder and select it for use according to different particle sizes. Ultrasonic vibration screens are now mostly used to screen graphite powder. By controlling the vibration of the sieve plate, the graphite powder is suspended through the sieve plate to achieve the purpose of screening the graphite powder.

[0003] When using an ultrasonic vibrating screen to screen graphite powder, the material needs to be put into the vibrating screen, and then a receiving container is set at each outlet position of the vibrating screen. The screened graphite powder is then classified, stored, and used. This process has multiple steps. During the specific implementation process, the conduction of the graphite powder is not consistent, and the screening efficiency cannot be guaranteed. In addition, the graphite powder is exposed to the air for a long time, and dust prevention is more difficult. Summary of the Invention

[0004] The purpose of the present invention is to solve the following problems existing in the prior art: when using an ultrasonic vibrating screen to screen graphite powder, it is necessary to take the material and put it into the vibrating screen, and then set a material receiving container at each outlet position of the vibrating screen, and then the screened graphite powder is classified, stored and used. This process has multiple steps. During the specific implementation process, the conduction of the graphite powder is not consistent, the screening efficiency cannot be guaranteed, and the graphite powder is exposed to the air for a long time, making dust prevention difficult.

[0005] In order to solve the problems existing in the prior art, the present invention provides an ultrasonic screening device for graphite powder, comprising an outer cylinder, wherein a first screen tube is eccentrically arranged inside the outer cylinder, and first eccentric tubes are connected to both ends of the first screen tube, and the first eccentric tube rotates coaxially with the outer cylinder, one end of the outer cylinder has a feeder connected to the first screen tube, and the other end of the outer cylinder has a first discharge pipe connected to the first screen tube, and the surface of the outer cylinder has a second discharge pipe connected to the gap between the first screen tube and the outer cylinder, the first screen tube includes a rubber tube, the rubber tube is tensioned, and the surface of the rubber tube has a filter screen, and the surface of the outer cylinder has a motor, and the output shaft of the motor is connected to the two first eccentric tubes through a gear set.

[0006] Preferably, a second screen tube is eccentrically arranged between the first screen tube and the outer cylinder. The second screen tube has the same structure as the first screen tube. Both ends of the second screen tube are connected to second eccentric tubes. The second eccentric tube rotates coaxially between the first eccentric tube and the outer cylinder. The output shaft of the motor is connected to the two second eccentric tubes through a gear set. A sleeve is rotatably sleeved on the surface of the second eccentric tube. The sleeve passes through the gap between the second eccentric tube and the first eccentric tube. The second eccentric tube is connected to a third discharge pipe.

[0007] Preferably, the eccentric distance between the first screen tube and the second screen tube relative to the outer cylinder is less than 1 / 2 of the radius of the first screen tube and the second screen tube.

[0008] Preferably, the first screen tube has an elastic rope inside, the elastic rope is coaxially arranged with the outer tube, the two ends of the elastic rope are connected to the first eccentric tube to tension the elastic rope, the middle part of the first screen tube is tensioned to the elastic rope through the elastic belt, and the middle part of the second screen tube is tensioned to the first screen tube through the elastic belt.

[0009] Preferably, the gear sets connected to the first screen tube and the second screen tube by the motor have the same transmission ratio, so that the first screen tube and the second screen tube rotate in the same direction and at the same angular speed.

[0010] Preferably, there are multiple second screen tubes, and the multiple second screen tubes are nested in sequence.

[0011] Preferably, the feeder includes a through shell with an air cavity inside. One end of the air cavity is rotatably connected to the first eccentric tube, and the other end of the air cavity is connected to the feed tube. Valve plates are rotatably provided at both ends of the air cavity, and the valve plates both rotate in the direction of the first eccentric tube. A valve block is adapted to slide on one side of the air cavity, and the valve block is elastically connected to the through shell through a spring. A cam is transmitted at the output end of the motor, and the cam squeezes and contacts the valve block.

[0012] The graphite powder screening method based on the ultrasonic screening equipment has the following specific steps:

[0013] A. Start the feeder to pneumatically introduce graphite powder into the first screening tube, and at the same time start the motor to drive the two first eccentric tubes to drive the first screening tube to rotate;

[0014] B. The first screening tube rotates eccentrically relative to the outer cylinder, causing the rubber tube to vibrate ultrasonically. Under the centrifugal action and ultrasonic vibration, the graphite powder inside the rubber tube passes through the filter and enters the gap between the first screening tube and the outer cylinder;

[0015] C. Large-sized graphite powder is discharged from the first discharge pipe, and small-sized graphite powder is discharged from the second discharge pipe.

[0016] Compared with related technologies, the graphite powder ultrasonic screening equipment and screening method provided by the present invention have the following beneficial effects:

[0017] 1. The present invention adopts an elastically tensioned rubber tube, which is combined with intermittently introduced gas in an eccentric rotating state to cause high-frequency vibration for screening graphite powder. The entire screening process maintains linear conduction of graphite powder in the tube, which improves the continuity of the screening process and can conveniently isolate the graphite powder from contact with the external environment, thereby preventing the graphite powder from being mixed with dust and preventing the graphite powder from entering the external environment.

[0018] 2. The present invention concentrically arranges one or more groups of second screen tubes outside the first screen tube to form a multi-level separation gap that is gradually finer from the inside to the outside, which is used for multi-level screening of graphite powder and more fine sorting of graphite powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the overall structural diagrams of the present invention;

[0020] Figure 2 This is the second schematic diagram of the overall structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the first screen tube structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of one end of the outer cylinder, the first eccentric tube, and the second eccentric tube coaxially rotating in the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the outer cylinder, the first eccentric tube, and the second eccentric tube coaxially rotating at the other end of the present invention;

[0025] Figure 7 This is a schematic diagram of the eccentric structure of the first screen tube, the second screen tube and the outer cylinder of the present invention;

[0026] Figure 8 This is a schematic diagram of the connection structure of the motor and feeder of the present invention;

[0027] Figure 9 It is a schematic structural diagram of the feeder of the present invention.

[0028] Numbers in the figure: 1. Outer cylinder; 11. Feed pipe; 12. First discharge pipe; 13. Second discharge pipe; 14. Third discharge pipe; 2. Feeder; 21. Through shell; 22. Air cavity; 23. Valve plate; 24. Valve block; 25. Cam; 3. Motor; 31. Gear set; 4. First screening tube; 41. Rubber tube; 42. Filter screen; 5. Second screening tube; 6. Elastic rope; 7. First eccentric tube; 71. Second eccentric tube; 8. Sleeve; 9. Elastic band. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0031] Example 1

[0032] like Figure 1-6 As shown, a graphite powder ultrasonic screening device includes an outer cylinder 1, which is cylindrical. A first screening tube 4 is disposed inside the outer cylinder 1. The first screening tube 4 includes a rubber tube 41, and a plurality of filter screens 42 are evenly disposed on the surface of the rubber tube 41. First eccentric tubes 7 are fixedly connected to both ends of the rubber tube 41. The two first eccentric tubes 7 are distributed and rotated concentrically to connect to the outer cylinder 1, so that the rubber tube 41 is tensioned. The eccentric distance of the rubber tube 41 relative to the outer cylinder 1 is less than 1 / 2 of the radius of the first screening tube 4.

[0033] A first discharge pipe 12 is coaxially mounted on the end of the left first eccentric tube 7. A second discharge pipe 13 is provided on the surface of the outer cylinder 1 to connect the gap between the first screen tube 4 and the outer cylinder 1.

[0034] like Figure 8 As shown, the motor 3 is fixed to the outer wall of the outer cylinder 1, and the output shaft of the motor 3 is connected to the gear set 31. The gear set 31 includes gears fixed to the outer walls of the two first eccentric tubes 7 and meshing gears. The motor 3 can simultaneously drive the two first eccentric tubes 7 to rotate synchronously and in the same direction.

[0035] like Figure 9 As shown, the feeder 2 includes a through shell 21, which is fixedly connected to the outer cylinder 1 through a bracket, and an air cavity 22 is provided inside the through shell 21. One end of the air cavity 22 extends and is rotatably connected to the first eccentric tube 7, and the other end of the air cavity 22 is connected to the feed pipe 11. Valve plates 23 are rotatably installed at both ends of the air cavity 22, and the valve plates 23 can only rotate in the direction of the first eccentric tube 7. A valve block 24 is slidably installed on one side of the air cavity 22. The valve block 24 is elastically connected to the through shell 21 through four sets of springs and a slide rod. A cam 25 is transmission-connected to the output end of the motor 3, and the cam 25 presses and contacts the valve block 24.

[0036] When screening graphite powder, the outer cylinder 1 is installed and fixed, the right end of the outer cylinder 1 is the feeding end, and the left end of the outer cylinder 1 is the screening end. The motor 3 is turned on to drive the cam 25 to rotate, and the valve block 24 is intermittently squeezed by the cam 25. The elastic force of the spring causes the valve block 24 to expand and contract to compress the gas in the air chamber 22. The user inserts the feeding pipe 11 into the graphite powder storage device. When the valve block 24 expands, a negative pressure is formed in the air chamber 22. At this time, the valve plate 23 on the left side blocks the left side opening of the air chamber 22, and the valve plate 23 on the right side rotates to open the right side opening of the air chamber 22, so that the feeding pipe 11 absorbs the graphite powder into the air chamber 22. When the valve block 24 is compressed, the air pressure in the air chamber 22 increases. At this time, the valve plate 23 on the right side closes the right side opening of the air chamber 22, and the valve plate 23 on the left side rotates to open the left side opening of the air chamber 22, so that the air flow drives the graphite powder from the first eccentric tube 7 on the right side into the rubber tube 41;

[0037] The two first eccentric tubes 7 drive the rubber tube 41 to rotate through the gear set 31. The rubber tube 41 rotates eccentrically relative to the outer cylinder 1. The tensioned rubber tube 41 generates high-frequency vibration under the high-speed eccentric rotation. Under the action of centrifugal force, the graphite powder is conducted to the left along the airflow around the inner wall of the rubber tube 41. The ultrasonically vibrating rubber tube 41 screens the graphite powder at the filter 42. Small-sized graphite powder enters the gap between the outer cylinder 1 and the rubber tube 41. At the same time, the airflow also passes through the filter 42. The airflow causes the small-sized graphite powder to be discharged from the second discharge pipe 13, while the large-sized graphite powder is retained in the rubber tube 41 and is discharged from the first discharge pipe 12 along with the airflow. The first discharge pipe 12 and the second discharge pipe 13 are connected to independent storage containers. The entire screening process can control the graphite powder from contacting with the outside air, preventing dust from entering the graphite powder and preventing dust from being generated during the conduction of the graphite powder.

[0038] An elastic cord 6 is inserted into the first screening tube 4 and is coaxially arranged with the outer cylinder 1. Both ends of the elastic cord 6 are connected to the inner wall of the first eccentric tube 7 to tighten the elastic cord 6. The middle part of the rubber tube 41 is tightened and connected to the elastic cord 6 through an elastic belt 9.

[0039] like Figure 3 、 Figure 7 As shown, during the rotation of the rubber tube 41, the elastic deformation of the middle part of the rubber tube 41 is the largest. The elastic rope 6 is at the axial position during the rotation. The elastic belt 9 allows the elastic rope 6 to share the centrifugal force of the middle part of the rubber tube 41, reducing the deformation of the middle part of the rubber tube 41, increasing the vibration frequency, and promoting the screening of graphite powder.

[0040] Example 2

[0041] like Figure 3-7 As shown, the second screen tube 5 has the same structure as the first screen tube 4. The second screen tube 5 is eccentrically arranged between the first screen tube 4 and the outer cylinder 1. The eccentric distance is less than 1 / 2 of the radius of the second screen tube 5. Two second eccentric tubes 71 are connected to both ends of the second screen tube 5. The second eccentric tubes 71 coaxially rotate between the first eccentric tube 7 and the outer cylinder 1. The two second eccentric tubes 71 are connected to the motor 3 through the gear set 31. A sleeve 8 is rotatably sleeved on the surface of the second eccentric tube 71. The sleeve 8 passes through the gap between the second eccentric tube 71 and the first eccentric tube 7. The second eccentric tube 71 is connected to the third discharge pipe 14. The gear set 31 connected to the first screen tube 4 and the second screen tube 5 by the motor 3 has the same transmission ratio, so that the first screen tube 4 and the second screen tube 5 rotate in the same direction and at the same angular velocity.

[0042] The screening size of the second screening tube 5 is smaller than that of the first screening tube 4. The first screening gap is between the second screening tube 5 and the first screening tube 4, and the second screening gap is between the outer cylinder 1 and the second screening tube 5. The first screening tube 4 and the second screening tube 5 rotate and vibrate synchronously. The graphite powder is first screened by the first screening tube 4 and enters the first gap. Then, it is screened by the second screening tube 5 and enters the second gap, thus forming three screening levels, so that the graphite powder can be processed more finely.

[0043] The middle portion of the second screen tube 5 is tensionedly connected to the first screen tube 4 via an elastic band 9, so as to reduce the vibration amplitude of the middle portion of the second screen tube 5 and increase the vibration frequency.

[0044] Example 3

[0045] A plurality of second screening tubes 5 are provided, and the plurality of second screening tubes 5 differ only in diameter, forming a nested distribution in sequence, and the screening size decreases from the inside to the outside. Screening gaps are formed between adjacent second screening tubes 5, forming a plurality of gradually finer screening gaps for finer screening of graphite powder.

[0046] Example 4

[0047] The graphite powder screening method based on the ultrasonic screening equipment has the following specific steps:

[0048] A. Start the feeder 2 to pneumatically introduce graphite powder into the first screening tube 4. At the same time, start the motor 3 to drive the two first eccentric tubes 7 to drive the first screening tube 4 to rotate.

[0049] B. The first sieve tube 4 rotates eccentrically relative to the outer cylinder 1, causing the rubber tube 41 to vibrate ultrasonically. Under the centrifugal action and ultrasonic vibration, the graphite powder inside the rubber tube 41 passes through the filter 42 and enters the gap between the first sieve tube 4 and the outer cylinder 1;

[0050] C. Graphite powder with large particle size is discharged from the first discharge pipe 12, and graphite powder with small particle size is discharged from the second discharge pipe 13.

Claims

1. A graphite powder ultrasonic screening device, comprising an outer cylinder (1), characterized in that: A first screening tube (4) is eccentrically arranged inside the outer cylinder (1), and first eccentric tubes (7) are connected to both ends of the first screening tube (4). The first eccentric tube (7) rotates coaxially with the outer cylinder (1). One end of the outer cylinder (1) has a feeder (2) connected to the first screening tube (4), and the other end of the outer cylinder (1) has a first discharge tube (12) connected to the first screening tube (4). The surface of the outer cylinder (1) has a second discharge tube (13) connected to the gap between the first screening tube (4) and the outer cylinder (1). The first screening tube (4) includes a rubber tube (41), the rubber tube (41) is tensioned, and a filter screen (42) is provided on the surface of the rubber tube (41). The surface of the outer cylinder (1) has a motor (3), and the output shaft of the motor (3) is connected to the two first eccentric tubes (7) through a gear set (31). A second screen tube (5) is eccentrically arranged between the first screen tube (4) and the outer cylinder (1); the second screen tube (5) has the same structure as the first screen tube (4); both ends of the second screen tube (5) are connected to second eccentric tubes (71); the second eccentric tube (71) coaxially rotates between the first eccentric tube (7) and the outer cylinder (1); the output shaft of the motor (3) is connected to the two second eccentric tubes (71) through a gear set (31); a sleeve (8) is rotatably sleeved on the surface of the second eccentric tube (71); the sleeve (8) passes through a gap between the second eccentric tube (71) and the first eccentric tube (7); and the second eccentric tube (71) is connected to a third discharge pipe (14); The first screening tube (4) has an elastic rope (6) inside, the elastic rope (6) is coaxially arranged with the outer tube (1), the two ends of the elastic rope (6) are connected to the first eccentric tube (7), so that the elastic rope (6) is tensioned, the middle part of the first screening tube (4) is tensionedly connected to the elastic rope (6) through an elastic belt (9), and the middle part of the second screening tube (5) is tensionedly connected to the first screening tube (4) through the elastic belt (9); The motor (3) drives the gear set (31) connected to the first sieve tube (4) and the second sieve tube (5) with the same transmission ratio, so that the first sieve tube (4) and the second sieve tube (5) rotate in the same direction and at the same angular speed; The feeder (2) comprises a through shell (21), the through shell (21) has an air cavity (22) inside, one end of the air cavity (22) is rotatably connected to the first eccentric tube (7), the other end of the air cavity (22) is connected to the feed tube (11), valve plates (23) are rotatably provided at both ends of the air cavity (22), the valve plates (23) both rotate in the direction of the first eccentric tube (7), a valve block (24) is adapted to slide on one side of the air cavity (22), the valve block (24) is elastically connected to the through shell (21) via a spring, and a cam (25) is driven at the output end of the motor (3), the cam (25) presses and contacts the valve block (24).

2. The graphite powder ultrasonic screening equipment according to claim 1, characterized in that: The eccentric distance between the first sieve tube (4) and the second sieve tube (5) relative to the outer cylinder (1) is less than 1 / 2 of the radius of the first sieve tube (4) and the second sieve tube (5).

3. The graphite powder ultrasonic screening equipment according to claim 1, characterized in that: There are a plurality of the second sieve tubes (5), and the plurality of second sieve tubes (5) are arranged in sequence.

4. A method for screening graphite powder based on the ultrasonic screening device according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: A. Turn on the feeder (2) to pneumatically introduce graphite powder into the first screening tube (4), and at the same time turn on the motor (3) to drive the two first eccentric tubes (7) to drive the first screening tube (4) to rotate; B. The first screening tube (4) rotates eccentrically relative to the outer cylinder (1), causing the rubber tube (41) to vibrate ultrasonically. Under the centrifugal action and ultrasonic vibration, the graphite powder inside the rubber tube (41) causes the small-sized graphite powder to pass through the filter screen (42) and enter the gap between the first screening tube (4) and the outer cylinder (1); C. Graphite powder with large particle size is discharged from the first discharge pipe (12), and graphite powder with small particle size is discharged from the second discharge pipe (13).

Images