Preparation process of multi-component composite conductive paste

Abstract

The invention discloses a preparation process of multi-component composite conductive paste, and belongs to the field of carbon nanotubes, a device comprises a conical shell, one side of the conical shell is provided with a solution box, the conical shell and the solution box are connected through two connecting bridges, the conical shell is internally provided with a grinding assembly, the solution box is internally provided with a solution preparation assembly, and the grinding assembly is connected with the solution box through two connecting bridges. The grinding assembly comprises a grinding inner container rotationally arranged in the conical shell, a grinding shaft is arranged in the middle of the grinding inner container, a cantilever beam plate is arranged at the top end of the conical shell, the grinding shaft penetrates through a shaft hole in the end of the cantilever beam plate, and the grinding shaft is connected to the grinding driving assembly. When the device is used, to-be-treated carbon nano tube powder is fed from the annular groove, the grinding inner container vibrates during rotation, then the powder in the annular groove slowly enters the discharging channel after vibration, and the powder can reach a gap between the conical surface of the bottom of the grinding inner container and a conical shell after being discharged from the leakage channel; and powder is crushed in the relative rotation process of the elastic sheet and the inner side wall of the conical shell.

Description

Technical Field

[0001] The invention relates to the field of carbon nanotubes, and in particular to a preparation process of a multi-component composite conductive slurry. Background Art

[0002] With the development of industrial technology, modern carbon nanotube technology is becoming more and more perfect. Conductive paste, as a material with electronic functions, is widely used in batteries and capacitors. The preparation of conductive paste requires carbon nanotube powder and solvent to be mixed together. The preparation of conductive paste for precision electronic components requires higher requirements.

[0003] In the past, when pre-processing carbon nanotube powder with conductive paste, it is easy for the powder to contain particulate impurities. These impurities can be used to manufacture precision electronic components, resulting in low product qualification rate. Secondly, when the conductive paste is stirred, it is easy to have bubbles. If these bubbles are not removed and used to manufacture electronic components, this will affect the conductivity of the components. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of a multi-component composite conductive slurry. When the device is in use, the carbon nanotube powder to be processed is put into the annular groove. At this time, the stepper motor drives the driven wheel to rotate through the driving wheel and the reduction belt, and the crushing inner liner rotates together with the driven wheel. The crushing inner liner generates vibration during rotation, and then the powder inside the annular groove enters the feeding channel under the condition of vibration. After the powder goes out of the leakage channel, it will reach the gap between the conical surface at the bottom of the crushing inner liner and the conical shell. The powder is crushed during the relative rotation of the elastic sheet and the inner wall of the cone shell. The pressure of the elastic sheet and the inner wall of the cone shell is applied by the torsion spring. The staff can replace the torsion spring of different sizes according to the processing conditions to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a preparation process of a multi-component composite conductive paste, comprising the following steps;

[0006] S1. The carbon nanotube conductive powder is introduced into a stirring tank and crushed;

[0007] S2 is equipped with a slurry, the slurry uses N-methylpyrrolidone as a solvent, and then puts a dispersant and a binder in the solvent, and the slurry is equipped with the completed conductive carbon nanotube powder and stirred together to form a conductive slurry;

[0008] S3. The conductive slurry is homogenized by a homogenizer at a pressure of 1200 bar. The conductive slurry after homogenization passes through a 170-mesh gauze screen. The filtered conductive slurry is then vacuum stirred and degassed to obtain the final product.

[0009] A device for a multi-component composite conductive slurry preparation process comprises a conical shell, a solution box is arranged on one side of the conical shell, the conical shell and the solution box are connected by two connecting bridges, a crushing assembly is arranged inside the conical shell, a liquid dispensing assembly is arranged inside the solution box, the crushing assembly comprises a crushing inner tank rotatably arranged inside the conical shell, a crushing shaft is arranged in the middle of the crushing inner tank, a cantilever plate is arranged at the top of the conical shell, the crushing shaft passes through the axial hole at the end of the cantilever plate, the crushing shaft is connected to the crushing drive assembly, a feeding mechanism is arranged at the top of the crushing inner tank, five annular array grooves are arranged on the conical surface of the bottom of the crushing inner tank, a torsion shaft is rotatably arranged inside the groove, an elastic sheet is arranged on the side wall of the torsion shaft, five elastic sheets are fitted on the inner wall of the conical shell along the direction of the array, a torsion spring is arranged on the top of the torsion shaft, a stirring drum is connected to the bottom of the conical shell, a slurry mixing assembly is arranged inside the stirring drum, a homogenizing assembly is arranged on one side of the stirring drum, and a vacuum stirring assembly is arranged on one side of the homogenizing assembly.

[0010] Furthermore, the liquid preparation assembly includes three metering chambers at the top of the mixing drum, a measuring ruler is provided on the inner wall of the metering chamber, three solenoid valves are provided on the side wall of the solution tank, the inner end of the solenoid valve extends to the interior of the metering chamber, the outer ends of the three solenoid valves are connected together through a cluster pipe, an infusion tube is provided at the bottom of the cluster pipe, and the bottom end of the infusion tube is connected to the interior of the mixing drum.

[0011] Furthermore, the feeding mechanism includes an annular groove on the top of the crushing inner container, and eight annular array of feeding channels are arranged inside the crushing inner container. The upper end of the feeding channel extends to the inside of the annular groove, and the lower end of the feeding channel extends to the outer wall of the crushing inner container.

[0012] Furthermore, the mixing impeller at the bottom end of the crushing shaft of the slurry mixing assembly is attached to the bottom of the mixing drum.

[0013] Furthermore, the crushing drive assembly includes a driven wheel disc at the top end of the crushing shaft, a driving wheel disc is arranged on one side of the driven wheel disc, the driving wheel disc and the driven wheel disc are connected by a reduction belt, the driving wheel disc is installed on the output end of the stepper motor, and the stepper motor is fixed on the side wall of the cantilever beam plate.

[0014] Furthermore, the homogenizing component includes a base plate at the bottom of the mixing drum, a high-pressure pump is arranged on the top of the base plate, an input pipe of the high-pressure pump is connected to the interior of the mixing drum, a steel pipe is arranged at the output end of the high-pressure pump, a cover plate is arranged at the end of the steel pipe, a plurality of needle eye channels in a circular array are arranged inside the cover plate, the rear end of the needle eye channel is covered by the cover plate, and a hose is arranged at the rear end of the cover plate.

[0015] Furthermore, the vacuum stirring assembly includes two shaft seats, a vacuum box is rotatably arranged in the middle of the shaft seats, the right end of the vacuum box is installed on the output shaft of the swing motor, the left end of the vacuum box is connected to a hose, a unloading plunger and an air valve are arranged on the side wall of the vacuum box, the air valve is connected to the air machine, and the air machine is fixed on the inner wall of the vacuum box.

[0016] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0017] Firstly, when the device is in use, the carbon nanotube powder to be processed is put into the annular groove. At this time, the stepper motor drives the driven wheel to rotate through the driving wheel and the reduction belt, and the crushing inner tank rotates together with the driven wheel. The crushing inner tank vibrates when it rotates, and then the powder inside the annular groove enters the feeding channel under the condition of vibration. After the powder goes out of the leakage channel, it will reach the gap between the conical surface at the bottom of the crushing inner tank and the conical shell. The powder is crushed in the process of relative rotation between the elastic sheet and the inner wall of the cone shell. The pressure of the elastic sheet and the inner wall of the cone shell is applied by the torsion spring. The staff can replace the torsion spring of different sizes according to the processing conditions to achieve the effect of efficient crushing.

[0018] Secondly, the three liquid materials of solvent, dispersant and binder are put into three metering chambers respectively. The staff discharge the materials according to the proportion of solvent, dispersant and binder. The three solenoid valves are opened at the same time to send the three solutions into the mixing drum through the infusion tube. The stirring impeller stirs the liquid and solid powder to form a conductive slurry. The high-pressure pump draws the conductive slurry through the needle eye inside the homogenizing box for homogenization, and the conductive slurry will become more delicate.

[0019] Thirdly, the conductive slurry after homogenization is then pushed into the vacuum box through a hose. During the process of inputting the conductive slurry into the hose, the air valve is opened to balance the pressure. After the vacuum box is filled with the conductive slurry, the air blower begins to extract the air from the vacuum box, making the inside of the vacuum box a low-pressure state. At the same time, the swing motor drives the vacuum box to twist sixty degrees back and forth. The conductive slurry inside the vacuum box will precipitate bubbles and become compact. The staff pulls out the unloading plunger to let the conductive slurry flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram showing a front view of a preparation process of a multi-component composite conductive paste.

[0021] Figure 2 It is a schematic diagram of a side view of the preparation process of a multi-component composite conductive paste.

[0022] Figure 3 It is a schematic diagram of a cross-sectional view of the preparation process of a multi-component composite conductive paste.

[0023] Figure 4 Schematic diagram of a cone shell preparation process for a multi-component composite conductive paste.

[0024] Figure 5 Schematic diagram of the preparation process of a multi-component composite conductive slurry and the crushing of the inner liner.

[0025] Figure 6 The schematic diagram of the preparation process of a multi-component composite conductive slurry is a crushed inner liner viewed from above.

[0026] Figure 7 Schematic diagram of a vacuum box for the preparation process of a multi-component composite conductive slurry.

[0027] Description of reference numerals:

[0028] Conical shell 1, cantilever plate 101, stepping motor 102, driving wheel 103, driven wheel 104, speed reduction belt 105, solution tank 2, metering chamber 201, cluster pipe 202, solenoid valve 203, infusion tube 204, connecting bridge 205, mixing drum 3, bottom plate 4, homogenizing box 5, cover plate 501, hose 502, vacuum box 6, shaft seat 601, swing motor 602, unloading plunger 603, air valve 604, crushing liner 7, annular groove 701, crushing shaft 702, blanking channel 703, stirring impeller 704, groove 705, elastic sheet 706, torsion spring 707, high-pressure pump 8. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The present invention provides Figure 1-Figure 7 The preparation process of a multi-component composite conductive paste shown includes the following steps:

[0031] S1. The carbon nanotube conductive powder is introduced into a stirring tank and crushed;

[0032] S2 is equipped with a slurry, the slurry uses N-methylpyrrolidone as a solvent, and then puts a dispersant and a binder in the solvent, and the slurry is equipped with the completed conductive carbon nanotube powder and stirred together to form a conductive slurry;

[0033] S3. The conductive slurry is homogenized by a homogenizer at a pressure of 1200 bar. The conductive slurry after homogenization passes through a 170-mesh gauze screen. The filtered conductive slurry is then vacuum stirred and degassed to obtain the final product.

[0034] A device for a multi-component composite conductive paste preparation process, comprising a cone shell 1, a solution tank 2 is arranged on one side of the cone shell 1, the cone shell 1 and the solution tank 2 are connected by two connecting bridges 205, a crushing assembly is arranged inside the cone shell 1, a liquid dispensing assembly is arranged inside the solution tank 2, the crushing assembly comprises a crushing liner 7 rotatably arranged inside the cone shell 1, a crushing shaft 702 is arranged in the middle of the crushing liner 7, a cantilever plate 101 is arranged at the top of the cone shell 1, the crushing shaft 702 passes through the axial hole at the end of the cantilever plate 101, the crushing shaft 702 is connected to the crushing drive assembly, a feeding mechanism is arranged at the top of the crushing liner 7, five annular array grooves 705 are arranged on the conical surface of the bottom of the crushing liner 7, and the inside of the groove 705 A torsion shaft is provided for rotation, and an elastic sheet 706 is provided on the side wall of the torsion shaft. Five elastic sheets 706 are attached to the inner wall of the cone shell 1 along this direction, and a torsion spring 707 is provided on the top of the torsion shaft. The bottom of the cone shell 1 is connected to a mixing drum 3, and a slurry mixing component is provided inside the mixing drum 3. A homogenizing component is provided on one side of the mixing drum 3, and a vacuum stirring component is provided on one side of the homogenizing component. The carbon nanotubes pass through the conical surface at the bottom of the powder liner and the gap between the cone shell. The elastic sheet 706 and the inner wall of the cone shell 1 rotate relative to each other to crush the powder. The pressure of the elastic sheet 706 and the inner wall of the cone shell 1 is applied by the torsion spring 707. The staff can replace the torsion spring 707 of different sizes according to the processing conditions, thereby achieving the effects of efficient crushing and portable debugging.

[0035] The liquid preparation assembly includes three metering chambers 201 at the top of the mixing drum 3, and a measuring ruler is provided on the inner wall of the metering chamber 201. Three solenoid valves 203 are provided on the side wall of the solution tank 2, and the inner end of the solenoid valve 203 extends to the interior of the metering chamber 201. The outer ends of the three solenoid valves 203 are connected together through a cluster tube 202. An infusion tube 204 is provided at the bottom of the cluster tube 202. The bottom end of the infusion tube 204 is connected to the interior of the mixing drum 3. The three liquid materials of solvent, dispersant and binder are respectively put into the three metering chambers 201. The staff discharges the materials according to the proportion of solvent, dispersant and binder. The three solenoid valves 203 are opened at the same time to send the three solutions into the interior of the mixing drum 3 through the infusion tube 204.

[0036] The feeding mechanism includes an annular groove 701 on the top of the crushing liner 7, and eight annular array feeding channels 703 are arranged inside the crushing liner 7. The upper end of the feeding channel 703 extends to the inside of the annular groove 701, and the lower end of the feeding channel 703 extends to the outer wall of the crushing liner 7. The carbon nanotube powder to be processed is fed into the annular groove 701. The crushing liner 7 vibrates when rotating, and then the powder inside the annular groove 701 enters the feeding channel 703 under the condition of vibration. After the powder goes out of the leakage channel 703, it will reach the gap between the conical surface and the cone shell at the bottom of the crushing liner 7.

[0037] The mixing slurry component has a stirring impeller 704 at the bottom end of the crushing shaft 702. The stirring impeller 704 is attached to the bottom of the mixing drum 3. The stirring impeller 704 stirs the liquid and the solid powder to form a conductive slurry.

[0038] The crushing drive assembly includes a driven wheel disc 104 at the top end of the crushing shaft 702, and a driving wheel disc 103 is arranged on one side of the driven wheel disc 104. The driving wheel disc 103 and the driven wheel disc 104 are connected by a reduction belt 105. The driving wheel disc 103 is installed on the output end of the stepper motor 102. The stepper motor 102 is fixed on the side wall of the cantilever plate 101. The stepper motor 102 drives the driven wheel disc 103 to rotate through the driving wheel disc 103 and the reduction belt 105, and the crushing inner liner 7 rotates together with the driven wheel disc 103. The stepper motor 102 applies rotational power to the crushing inner liner 7 and the stirring impeller 704.

[0039] The homogenizing component includes a bottom plate 4 at the bottom of the mixing drum 3, a high-pressure pump 8 is arranged on the top of the bottom plate 4, an input pipe of the high-pressure pump 8 is connected to the interior of the mixing drum 3, a steel pipe is arranged at the output end of the high-pressure pump 8, a cover plate 501 is arranged at the end of the steel pipe, a plurality of needle eye channels in a circular array are arranged inside the cover plate 501, the rear end of the needle eye channel is covered by the cover plate 501, a hose 502 is arranged at the rear end of the cover plate 501, and the high-pressure pump 8 draws the conductive slurry through the needle eye inside the homogenizing box 5 for homogenization, so that the conductive slurry becomes finer.

[0040] The vacuum stirring assembly includes two shaft seats 601, and a vacuum box 6 is rotatably arranged in the middle of the shaft seats 601. The right end of the vacuum box 6 is mounted on the output shaft of the swing motor 602, and the left end of the vacuum box 6 is connected to the hose 502. A discharge plunger 603 and an air valve 604 are arranged on the side wall of the vacuum box 6. The air valve 604 is connected to the air machine, and the air machine is fixed on the inner wall of the vacuum box 6. The conductive slurry after the homogenization operation is completed is then pushed into the vacuum box 6 through the hose 502. During the process of inputting the conductive slurry into the hose 502, the air valve 604 is opened to balance the pressure. After the vacuum box 6 is filled with the conductive slurry, the air machine starts to extract the air inside the vacuum box 6 to make the inside of the vacuum box 6 present a low-pressure state. At the same time, the swing motor 602 drives the vacuum box 6 to twist back and forth by sixty degrees. The conductive slurry inside the vacuum box 6 will precipitate bubbles and become compact. The staff pulls out the discharge plunger 603 to let the conductive slurry flow out.

[0041] Working principle: The carbon nanotubes pass through the gap between the conical surface at the bottom of the powder liner and the conical shell. The elastic sheet 706 and the inner wall of the conical shell 1 rotate relative to each other to crush the powder. The pressure between the elastic sheet 706 and the inner wall of the conical shell 1 is applied by the torsion spring 707. The staff can replace the torsion spring 707 of different sizes according to the processing conditions, thereby achieving the effects of efficient crushing and portable debugging. The three liquid materials of solvent, dispersant and binder are respectively put into the three metering chambers 201. The staff discharges the materials according to the proportion of solvent, dispersant and binder. The three solenoid valves 203 are opened at the same time to send the three solutions into the mixing drum 3 through the infusion tube 204. The carbon nanotube powder to be processed is put in from the annular groove 701. The crushing liner 7 vibrates when it rotates, and then the powder inside the annular groove 701 enters the dropping channel 703 under vibration. After the powder goes out of the leakage channel 703, it will reach the gap between the conical surface at the bottom of the crushing liner 7 and the conical shell. The stirring impeller 704 stirs the liquid and solid powder to form a conductive slurry. The stepper motor 102 drives the driven wheel 103 to rotate through the driving wheel 103 and the speed reduction belt 105, and the driven wheel 103 of the crushed liner 7 rotates together. The stepper motor 102 applies rotational power to the crushed liner 7 and the stirring impeller 704. The high-pressure pump 8 extracts the conductive slurry through the needle hole inside the homogenizing box 5 for homogenization, and then the conductive slurry will become more delicate. The conductive slurry after the homogenization operation is completed is then pushed into the vacuum box 6 through the hose 502. During the process of inputting the conductive slurry into the hose 502, the air valve 604 is opened to balance the pressure. After the vacuum box 6 is filled with the conductive slurry, the air machine begins to extract the air inside the vacuum box 6, so that the inside of the vacuum box 6 is in a low-pressure state. At the same time, the swing motor 602 drives the vacuum box 6 to twist back and forth by sixty degrees. The conductive slurry inside the vacuum box 6 will precipitate bubbles and become compact. The staff pulls out the unloading plunger 603 to let the conductive slurry flow out.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A process for preparing a multi-component composite conductive paste, characterized in that: The steps include: S1. The carbon nanotube conductive powder is introduced into a stirring tank and crushed; S2 is equipped with a slurry, the slurry uses N-methylpyrrolidone as a solvent, and then puts a dispersant and a binder in the solvent, and the slurry is equipped with the completed conductive carbon nanotube powder and stirred together to form a conductive slurry; S3. The conductive slurry is homogenized by a homogenizer at a pressure of 1200 bar. The conductive slurry after homogenization passes through a 170-mesh gauze screen. The filtered conductive slurry is then vacuum stirred and degassed to obtain the final product.

2. The process for preparing a multi-component composite conductive paste according to claim 1, characterized in that: The invention comprises a cone shell (1), a solution tank (2) is arranged on one side of the cone shell (1), the cone shell (1) and the solution tank (2) are connected via two connecting bridges (205), a crushing assembly is arranged inside the cone shell (1), a liquid dispensing assembly is arranged inside the solution tank (2), the crushing assembly comprises a crushing inner tank (7) rotatably arranged inside the cone shell (1), a crushing shaft (702) is arranged in the middle of the crushing inner tank (7), a cantilever plate (101) is arranged at the top end of the cone shell (1), the crushing shaft (702) passes through the shaft hole at the end of the cantilever plate (101), and the crushing shaft (702) is connected to the crushing drive assembly. A feeding mechanism is arranged at the top of the crushing inner container (7), and five grooves (705) in an annular array are arranged on the conical surface at the bottom of the crushing inner container (7). A torsion shaft is rotatably arranged inside the groove (705), and an elastic sheet (706) is arranged on the side wall of the torsion shaft. The five elastic sheets (706) are attached to the inner wall of the cone shell (1) along the direction of the array, and a torsion spring (707) is arranged at the top of the torsion shaft. The bottom of the cone shell (1) is connected to a stirring drum (3), and a slurry mixing component is arranged inside the stirring drum (3). A homogenizing component is arranged on one side of the stirring drum (3), and a vacuum stirring component is arranged on one side of the homogenizing component.

3. The preparation process of a multi-component composite conductive paste according to claim 2, characterized in that: The liquid dispensing assembly comprises three metering chambers (201) at the top of a mixing drum (3), a metering ruler is arranged on the inner wall of the metering chamber (201), three solenoid valves (203) are arranged on the side wall of the solution tank (2), the inner ends of the solenoid valves (203) extend into the interior of the metering chamber (201), the outer ends of the three solenoid valves (203) are connected together through a cluster tube (202), a liquid infusion tube (204) is arranged at the bottom of the cluster tube (202), and the bottom end of the liquid infusion tube (204) is connected to the interior of the mixing drum (3).

4. The process for preparing a multi-component composite conductive paste according to claim 2, characterized in that: The feeding mechanism comprises an annular groove (701) at the top of the crushing inner container (7), and eight annular array of feeding channels (703) are arranged inside the crushing inner container (7), the upper ends of the feeding channels (703) extend into the interior of the annular groove (701), and the lower ends of the feeding channels (703) extend to the outer wall of the crushing inner container (7).

5. The process for preparing a multi-component composite conductive paste according to claim 2, characterized in that: The mixing impeller (704) at the bottom end of the grinding shaft (702) of the mixing and slurry assembly is fitted on the bottom of the mixing drum (3).

6. The process for preparing a multi-component composite conductive paste according to claim 2, characterized in that: The crushing drive assembly comprises a driven wheel disc (104) at the top end of the crushing shaft (702), a driving wheel disc (103) is arranged on one side of the driven wheel disc (104), the driving wheel disc (103) and the driven wheel disc (104) are connected via a speed reduction belt (105), the driving wheel disc (103) is installed on the output end of the stepping motor (102), and the stepping motor (102) is fixed on the side wall of the cantilever plate (101).

7. The process for preparing a multi-component composite conductive paste according to claim 2, characterized in that: The homogenizing component comprises a bottom plate (4) at the bottom of a mixing drum (3); a high-pressure pump (8) is arranged at the top of the bottom plate (4); an input pipe of the high-pressure pump (8) is connected to the interior of the mixing drum (3); a steel pipe is arranged at the output end of the high-pressure pump (8); a cover plate (501) is arranged at the end of the steel pipe; a plurality of needle-eye channels in a circular array are arranged inside the cover plate (501); the rear end of the needle-eye channels is covered by the cover plate (501); and a hose (502) is arranged at the rear end of the cover plate (501).

8. The process for preparing a multi-component composite conductive paste according to claim 2, characterized in that: The vacuum stirring assembly comprises two shaft seats (601), a vacuum box (6) is rotatably arranged in the middle of the shaft seats (601), the right end of the vacuum box (6) is mounted on the output shaft of the swing motor (602), the left end of the vacuum box (6) is connected to the hose (502), a discharge plunger (603) and an air valve (604) are arranged on the side wall of the vacuum box (6), the air valve (604) is connected to an air machine, and the air machine is fixed on the inner wall of the vacuum box (6).

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