Screw exhaust device

Abstract

The invention relates to a screw exhaust device which comprises an exhaust barrel fixed on a kneading machine barrel, the exhaust barrel is connected with a vacuum pump through an exhaust connecting pipe group, an exhaust cavity is formed in the exhaust barrel, an exhaust screw unit is arranged in the exhaust cavity, one end of the exhaust screw unit extends out of the exhaust cavity to be connected with the output end of a motor, and meanwhile, the exhaust screw unit is connected with the output end of the motor. The other end of the exhaust screw unit extends into the kneading machine barrel from the exhaust cavity; the vacuum pump drives the interior of the exhaust cavity to generate negative pressure, so that redundant gas in the kneading machine barrel is exhausted; and when redundant gas is exhausted, the motor drives the exhaust screw unit to rotate, so that slurry in the kneading machine barrel is prevented from entering the exhaust cavity. By arranging the exhaust cylinder, redundant gas in the kneading machine cylinder is exhausted, so that bubbles are prevented from being generated in slurry, and the pulping quality is improved; by arranging the exhaust screw unit, gas-liquid separation can be achieved, the pulping process is prevented from being broken, an exhaust pipeline is prevented from being blocked, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery slurry preparation, in particular to a screw exhaust device. Background Art

[0002] Screw kneading machine is widely used in the field of lithium battery slurry preparation. Its structure includes a barrel, a driving device, and a screw. The driving device drives the screw to rotate, thereby stirring and mixing the powder raw materials and liquid raw materials in the barrel to prepare lithium battery slurry. When the screw kneading machine is working, the powder raw materials will introduce excess air into the barrel when feeding. Therefore, it is necessary to exhaust the excess gas in the barrel through the exhaust device during the slurry making process to ensure the stability of the internal pressure of the barrel.

[0003] In the prior art, the exhaust device for the screw kneading machine usually directly extracts gas from the barrel. This exhaust device is not suitable for the lithium battery industry. It will extract the slurry inside the barrel together with the gas, thereby interrupting the pulping process and reducing production efficiency. At the same time, the extracted slurry will block the exhaust pipeline, affecting the subsequent exhaust process. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a screw exhaust device with a rational structure. By providing an exhaust pipe, excess gas in the kneading machine barrel can be discharged, thereby avoiding the generation of bubbles in the slurry and improving the pulping quality; by providing an exhaust screw unit, gas-liquid separation can be achieved, avoiding interruption of the pulping process and blockage of the exhaust pipeline, thereby improving production efficiency.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A screw exhaust device, comprising an exhaust cylinder fixed on a kneader barrel, the exhaust cylinder being connected to a vacuum pump through an exhaust connecting pipe group, an exhaust cavity being arranged inside the exhaust cylinder, an exhaust screw unit being arranged inside the exhaust cavity, one end of the exhaust screw unit extending to the outside of the exhaust cavity and connected to an output end of a motor, and at the same time, the other end of the exhaust screw unit extending from the exhaust cavity into the inside of the kneader barrel;

[0007] The vacuum pump drives the exhaust chamber to generate negative pressure, so that the excess gas inside the kneading machine barrel is discharged through the exhaust chamber and the exhaust connecting pipe group in sequence;

[0008] When the excess gas is discharged, the motor drives the exhaust screw unit to rotate, thereby preventing the slurry in the kneading machine barrel from entering the exhaust chamber.

[0009] As a further improvement of the above technical solution:

[0010] The output end of the motor is connected to the exhaust screw unit through a transmission unit, and the transmission unit is installed in cooperation with the exhaust pipe through a connecting pipe.

[0011] The connecting cylinder is fixed to the top of the exhaust cylinder, and an installation cavity is provided inside the connecting cylinder. The installation cavity is isolated from the exhaust cavity by a seal, and the end of the exhaust screw unit passes through the installation cavity and is connected to the output end of the transmission unit.

[0012] The transmission unit includes a reducer and a gearbox, the input end of the reducer is connected to the output end of the motor, the output end of the reducer is connected to the input end of the gearbox, and the output end of the gearbox is connected to the exhaust screw unit.

[0013] The exhaust screw unit comprises at least one exhaust screw, and a screw element is arranged on the outer wall surface of the single exhaust screw. When the exhaust screw rotates, the slurry is prevented from climbing by the screw element.

[0014] A first through hole is provided on the side wall surface of the exhaust pipe, and a first joint is installed in the first through hole.

[0015] The first joint is connected to a waste liquid tank, and a jacket is provided on the waste liquid tank. The jacket is used to adjust the temperature inside the waste liquid tank, thereby preventing the slurry inside the waste liquid tank from sticking.

[0016] A second through hole is opened on the side wall surface of the exhaust pipe, and a second joint is installed in the second through hole. The internal environment of the second joint is connected with the exhaust chamber. An end cover is installed at the end of the second joint through a clamp. The end cover isolates the internal environment of the second joint from the external natural environment. A pressure gauge is installed on the second joint, and the pressure gauge displays the internal pressure of the exhaust chamber.

[0017] The exhaust pipe is installed in cooperation with the kneading machine cylinder through a plug.

[0018] At least one kneading screw for stirring the slurry is arranged inside the kneading machine barrel. The kneading screw and the exhaust screw unit are arranged perpendicularly to each other, and the bottom end surface of the exhaust screw unit is not lower than the top end surface of the kneading screw.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention has a compact and reasonable structure and is easy to operate. By arranging an upright exhaust screw unit, the slurry can be pressed down during rotation, thereby pushing the slurry brought out during air extraction back into the kneading machine barrel, achieving gas-liquid separation, avoiding interruption of the pulping process, preventing the slurry from clogging the exhaust pipeline, and improving the pulping efficiency and production efficiency.

[0021] In the present invention, by arranging the exhaust pipe, the excess gas in the kneading machine cylinder can be discharged, thereby avoiding the generation of bubbles in the slurry and improving the pulping quality.

[0022] In the present invention, by setting a plug, the installation height of the screw exhaust device can be adjusted, thereby adjusting the installation height of the exhaust screw unit, ensuring that the bottom end surface of the exhaust screw unit is not lower than the top end surface of the kneading screw, thereby avoiding interference with the movement of the kneading screw.

[0023] In the present invention, a small gap is provided between the inner wall surface of the exhaust chamber and the outer contour of the exhaust screw, thereby avoiding friction between the exhaust screw and the exhaust cylinder and avoiding the generation of metal particles, thereby ensuring the pulping quality.

[0024] In the present invention, a sealing member is provided, which adopts a packing sealing method, so as to prevent the slurry in the exhaust cavity from leaking into the connecting cavity, thereby extending the service life of the transmission unit.

[0025] The present invention can serve as a buffer between the vacuum pump and the exhaust pipe by arranging a waste liquid tank, thereby preventing the vacuum pressure in the exhaust chamber from rising too quickly; at the same time, it can collect the slurry brought out by the negative pressure to form a secondary gas-liquid separation, thereby preventing the slurry from being sucked into the vacuum pump, thereby protecting the vacuum pump.

[0026] In the present invention, a jacket is provided on the waste liquid tank, and the heat-conducting silicone grease can be circulated in the jacket for heating or cooling, thereby adjusting the temperature inside the waste liquid tank and preventing the slurry from sticking in the waste liquid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention.

[0028] Figure 2 for Figure 1 Front view (waste tank omitted).

[0029] Figure 3 for Figure 2 Cross-sectional view of section AA.

[0030] Figure 4 for Figure 3 Cross-sectional view of section BB.

[0031] Figure 5 It is a schematic diagram of the present invention in working state.

[0032] Among them: 1. Motor; 2. Exhaust pipe; 201. Exhaust chamber; 3. Connecting pipe; 301. Installation chamber; 302. Seal; 4. Reducer; 5. Gearbox; 6. Exhaust screw; 7. Pressure gauge; 8. First joint; 9. Second joint; 10. Clamp; 11. End cover; 12. Plug; 13. Kneading machine barrel; 14. Kneading screw; 15. Waste liquid tank. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0034] like Figure 1-Figure 5 As shown, a screw exhaust device includes an exhaust pipe 2 fixed on a kneading machine barrel 13, the exhaust pipe 2 is connected to a vacuum pump through an exhaust connecting pipe group, an exhaust chamber 201 is provided inside the exhaust pipe 2, an exhaust screw unit is arranged inside the exhaust chamber 201, one end of the exhaust screw unit extends to the outside of the exhaust chamber 201 and is connected to the output end of the motor 1, and at the same time, the other end of the exhaust screw unit extends from the exhaust chamber 201 to the inside of the kneading machine barrel 13; the vacuum pump drives the exhaust chamber 201 to generate negative pressure, so that the excess gas inside the kneading machine barrel 13 is discharged through the exhaust chamber 201 and the exhaust connecting pipe group in sequence; when the excess gas is discharged, the motor 1 drives the exhaust screw unit to rotate, thereby preventing the slurry inside the kneading machine barrel 13 from entering the exhaust chamber 201. A screw exhaust device of the present invention is suitable for a screw kneading machine for lithium battery pulping. By setting an exhaust screw unit, it can block and press down the rising pulp when rotating, and push the pulp back into the kneading machine barrel 13, thereby realizing gas-liquid separation in the exhaust process, avoiding interruption of the pulping process, and preventing the vacuum passage from being blocked, thereby improving the pulping efficiency.

[0035] The structure and function of the present invention are as follows:

[0036] like Figure 1-Figure 4 As shown, a screw exhaust device of the present invention comprises a motor 1, an exhaust cylinder 2, a connecting cylinder 3, a reducer 4, a gearbox 5, and an exhaust screw unit; wherein,

[0037] The motor 1 is used to drive the exhaust screw unit to rotate. The output end of the motor 1 is connected to the exhaust screw unit through the transmission unit. The transmission unit is installed in conjunction with the exhaust pipe 2 through the connecting pipe 3.

[0038] The transmission unit includes a reducer 4 and a gearbox 5, the input end of the reducer 4 is connected to the output end of the motor 1, the output end of the reducer 4 is connected to the input end of the gearbox 5, and the output end of the gearbox 5 is connected to the exhaust screw unit. The gearbox 5 can be provided with multiple output ends, and its output ends are connected one by one with the exhaust screws 6 in the exhaust screw unit.

[0039] The connecting tube 3 is fixed to the top of the exhaust pipe 2, and an installation cavity 301 is provided inside the connecting tube 3. The end of the exhaust screw unit passes through the installation cavity 301 and is connected to the output end of the transmission unit; the connecting tube 3 is used to connect the exhaust pipe 2 and the gearbox 5, and can carry the gearbox 5 to improve the structural stability.

[0040] An exhaust cavity 201 is provided inside the exhaust tube 2, and a connecting cavity 301 is provided inside the connecting tube 3. The exhaust cavity 201 and the connecting cavity 301 are arranged concentrically, and the installation cavity 301 and the exhaust cavity 201 are isolated by a seal 302. The seal 301 adopts a packing sealing method to prevent the slurry in the exhaust cavity 201 from leaking into the connecting cavity 301.

[0041] The exhaust screw unit includes at least one exhaust screw 6, and a screw element is arranged on the outer wall of the single exhaust screw 6. The single exhaust screw 6 is arranged upright in the vertical direction (correspondingly, the exhaust tube 2 adopts a vertical arrangement). When the exhaust screw 6 rotates, the screw element prevents the slurry from climbing.

[0042] The exhaust screw 6 is concentrically arranged in the exhaust chamber 201 , and there is a small gap between the inner wall of the exhaust chamber 201 and the outer contour of the exhaust screw 6 , thereby avoiding friction between the exhaust screw 6 and the exhaust cylinder 2 and avoiding the generation of metal particles.

[0043] The single exhaust screw 6 is connected to the corresponding output end of the gearbox 5 through a coupling, and the coupling is used to transmit torque to ensure stable rotation of the exhaust screw 6.

[0044] A first through hole is provided on the side wall of the exhaust pipe 2, and a first joint 8 is installed in the first through hole; the first joint 8 is connected to the waste liquid tank 15, and a jacket is provided on the waste liquid tank 15, and the jacket is used to adjust the temperature inside the waste liquid tank 15, so as to prevent the slurry inside the waste liquid tank 15 from sticking.

[0045] The first joint 8 is used to connect the exhaust connecting pipe group, which includes a first connecting pipe group and a second connecting pipe group.

[0046] The first joint 8 is connected to the waste liquid tank 15 through a first connecting pipe group. The waste liquid tank 15 is provided with a vacuum port, and the vacuum port is connected to a vacuum pump through a second connecting pipe group.

[0047] The vacuum pump extracts air from the waste liquid tank 15 and the exhaust chamber 201, thereby forming a negative pressure in the exhaust chamber 201, so that the gas in the kneading machine barrel 3 flows into the exhaust chamber 201;

[0048] The waste liquid tank 15 can serve as a buffer between the vacuum pump and the exhaust pipe 2, thereby preventing the vacuum pressure in the exhaust chamber 201 from rising too quickly; and can form a secondary gas-liquid separation, collect the slurry brought out by the negative pressure, and prevent the slurry from being sucked into the vacuum pump, thereby protecting the vacuum pump;

[0049] The waste liquid tank 15 is provided with a jacket, which can be heated or cooled by circulating heat-conducting silicone grease in the jacket, thereby adjusting the temperature inside the waste liquid tank 15 and preventing the slurry from sticking in the waste liquid tank 15 .

[0050] A second through hole is opened on the side wall surface of the exhaust pipe 2, and a second joint 9 is installed in the second through hole. The internal environment of the second joint 9 is connected with the exhaust chamber 201. The end of the second joint 9 is installed with an end cover 11 through a clamp 10. The end cover 11 isolates the internal environment of the second joint 9 from the external natural environment. A pressure gauge 7 is installed on the second joint 9, and the pressure gauge 7 displays the internal pressure of the exhaust chamber 201.

[0051] At least one kneading screw 14 for stirring the slurry is arranged inside the kneading machine barrel 13, and the kneading screw 14 and the exhaust screw unit are arranged perpendicularly to each other, and the bottom end surface of the exhaust screw unit is not lower than the top end surface of the kneading screw 14. In the present invention, two kneading screws 14 are arranged, and the phase difference between the two is 90°, and they rotate in the same direction when working, so as to stir the slurry in the kneading machine barrel 3.

[0052] The exhaust cylinder 2 is installed in cooperation with the kneader barrel 13 through the plug 12. Specifically, a third through hole is provided on the top wall of the kneader barrel 13, and the exhaust cavity 201 of the exhaust cylinder 2 is connected with the internal space of the kneader barrel 13 through the third through hole. The plug 12 is installed in cooperation with the third through hole. The plug 12 is a convex structure, and a through hole is provided in the middle. The exhaust screw 6 in the exhaust screw unit passes through the through hole of the plug 12 and enters the kneader barrel 13.

[0053] By providing the plug 12 , the installation height of the screw exhaust device can be adjusted, thereby adjusting the installation height of the exhaust screw unit to ensure that the bottom end surface of the exhaust screw unit is not lower than the top end surface of the kneading screw 14 , thereby avoiding interference with the movement of the kneading screw 14 .

[0054] The working process of the present invention is as follows:

[0055] When the screw kneading machine needs to be vented, start the motor 1 and start the vacuum pump;

[0056] First, the vacuum pump forms a negative pressure in the exhaust chamber 201 through the exhaust connecting pipe assembly, so that the gas in the kneading machine barrel 13 enters the exhaust chamber 201 through the through hole of the plug 12, and then is discharged to the external environment through the exhaust connecting pipe assembly;

[0057] At the same time, the motor 1 drives the multiple exhaust screws 6 to rotate simultaneously through the reducer 4 and the gearbox 5, thereby pressing down the slurry that rises during the exhaust process to achieve gas-liquid separation.

[0058] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A screw exhaust device, characterized in that: The invention comprises an exhaust cylinder (2) fixed on a kneading machine barrel (13), the exhaust cylinder (2) being connected to a vacuum pump via an exhaust connecting pipe group, an exhaust cavity (201) being arranged inside the exhaust cylinder (2), an exhaust screw unit being arranged inside the exhaust cavity (201), one end of the exhaust screw unit extending to the outside of the exhaust cavity (201) and connected to the output end of the motor (1), and at the same time, the other end of the exhaust screw unit extending from the exhaust cavity (201) into the inside of the kneading machine barrel (13); The vacuum pump drives the exhaust chamber (201) to generate negative pressure, so that the excess gas inside the kneading machine barrel (13) is discharged through the exhaust chamber (201) and the exhaust connecting pipe group in sequence; When the excess gas is discharged, the motor (1) drives the exhaust screw unit to rotate, thereby preventing the slurry inside the kneading machine barrel (13) from entering the exhaust chamber (201).

2. A screw exhaust device according to claim 1, characterized in that: The output end of the motor (1) is connected to the exhaust screw unit via a transmission unit, and the transmission unit is mounted in cooperation with the exhaust cylinder (2) via a connecting cylinder (3).

3. A screw exhaust device as claimed in claim 2, characterized in that: The connecting tube (3) is fixed to the top of the exhaust tube (2); an installation cavity (301) is provided inside the connecting tube (3); the installation cavity (301) is isolated from the exhaust cavity (201) by a seal (302); and the end of the exhaust screw unit passes through the installation cavity (301) and is connected to the output end of the transmission unit.

4. A screw exhaust device as claimed in claim 2, characterized in that: The transmission unit comprises a reducer (4) and a gearbox (5), the input end of the reducer (4) being connected to the output end of the motor (1), the output end of the reducer (4) being connected to the input end of the gearbox (5), and the output end of the gearbox (5) being connected to the exhaust screw unit.

5. A screw exhaust device according to claim 1, characterized in that: The exhaust screw unit comprises at least one exhaust screw (6), and a screw element is arranged on the outer wall surface of the single exhaust screw (6). When the exhaust screw (6) rotates, the slurry is prevented from climbing up by the screw element.

6. A screw exhaust device according to claim 1, characterized in that: A first through hole is provided on the side wall surface of the exhaust pipe (2), and a first joint (8) is installed in the first through hole.

7. A screw exhaust device according to claim 6, characterized in that: The first joint (8) is connected to a waste liquid tank (15), and a jacket is provided on the waste liquid tank (15). The jacket is used to adjust the temperature inside the waste liquid tank (15), thereby preventing the slurry inside the waste liquid tank (15) from sticking.

8. A screw exhaust device according to claim 1, characterized in that: A second through hole is provided on the side wall of the exhaust pipe (2), and a second joint (9) is installed in the second through hole. The internal environment of the second joint (9) is connected to the exhaust chamber (201). An end cover (11) is installed at the end of the second joint (9) through a clamp (10). The end cover (11) isolates the internal environment of the second joint (9) from the external natural environment. A pressure gauge (7) is installed on the second joint (9), and the pressure gauge (7) displays the internal pressure of the exhaust chamber (201).

9. A screw exhaust device according to claim 1, characterized in that: The exhaust pipe (2) is installed in cooperation with the kneading machine barrel (13) via a plug (12).

10. A screw exhaust device according to claim 1, characterized in that: At least one kneading screw (14) for stirring the slurry is arranged inside the kneading machine barrel (13); the kneading screw (14) and the exhaust screw unit are arranged in a direction perpendicular to each other; and the bottom end surface of the exhaust screw unit is not lower than the top end surface of the kneading screw (14).

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