Vacuum coater and method of cleaning the same

Abstract

The present application belongs to the technical field of spray coater. The vacuum spray coater comprises a barrel, a discharge port arranged at the bottom of the barrel, a discharge door device arranged on the discharge port, a cleaning device and a fan assembly. The discharge door device comprises a discharge door for closing and opening the discharge port and forming a gap between the discharge door and the discharge port. The cleaning device comprises a fan assembly arranged on the barrel, which is used for injecting air into the barrel. When the fan assembly works, air is injected into the barrel, and the residual material in the barrel is brought into the discharge port under the action of the fan assembly and discharged from the gap between the discharge door and the discharge port, thereby realizing the cleaning of the residual material in the spray coater. The present application also discloses a cleaning method for the vacuum spray coater. The present application is used to solve the technical problem of high residual rate of the existing vacuum spray coater.

Description

Technical Field

[0001] This invention belongs to the field of spraying machine technology, specifically relating to a vacuum spraying machine and the above-mentioned vacuum spraying machine cleaning method. Background Technology

[0002] In existing technologies, after feed has been shaped and dried, it is then sprayed with a certain amount of oil (a type of liquid) to improve its nutritional value, energy structure, and feed conversion ratio. Vacuum spraying machines are characterized by their ability to handle high oil addition levels, and are therefore widely used in feed spraying processes.

[0003] In existing vertical spray coating machines, material enters through the feed inlet. A vacuum pump then operates, drawing a vacuum to a specified level. The rotor then rotates forward, lifting the material from the bottom to the top for scattering. A liquid pump sprays grease into the machine. During scattering, the material comes into contact with the grease, completing one coat. The scattered material falls back to the bottom, and the rotor lifts it again, repeating this process several times until a certain amount of grease is evenly applied to the feed surface. Then, the vacuum release valve opens, allowing air to enter the machine. The pressure difference between the inside and outside of the machine forces the grease from the surface of the pellets into their interior. Finally, the discharge door at the bottom of the machine opens, and the central rotor reverses to discharge the material. Once all material has been discharged, the entire spraying process is complete.

[0004] like Figure 1 As shown, the spraying machine mainly consists of three parts: the upper cover 1 is located at the top of the spraying machine, with a feed inlet and vacuum pipe, etc.; the cone body 2 is located at the bottom of the spraying machine and is connected to the discharge door 3 through a flange 302.

[0005] like Figure 2 As shown, the discharge gate 301 is controlled by a solenoid valve 303 to move up and down. When the discharge gate is discharging material, the solenoid valve 303 is energized, which moves the discharge gate 301 downwards via the cylinder 306. When the contact on the gate body contacts the first limit switch 304, the gate is fully open, the solenoid valve 303 is de-energized, and the cylinder 306 stops operating. After discharging is complete, the solenoid valve 303 is energized, which moves the gate body 301 upwards via the cylinder 306. When the contact on the gate body contacts the third limit switch 305, the gate is fully closed. Then, the solenoid valve 303 is de-energized, and the cylinder 306 stops operating.

[0006] With the development of feed formulation technology, an increasing proportion of high-oil content (for example, in some rainbow trout feeds, the oil content exceeds 20%, and can reach up to 35%) is being applied to the feed using spraying equipment. Because of the high oil content and the short duration of the spraying process (normally a spraying cycle is about 6 minutes), the feed cannot absorb such a large amount of oil in a short time. As a result, a large amount of oil residue is found on the surface of the pellets at the sprayer outlet (this residue is gradually absorbed by the pellets during cooling and storage; for some materials, this absorption process takes about 30 minutes or even longer). Oil also drips from the inner wall of the sprayer. Because oil has a certain viscosity, opening the inspection door above the sprayer reveals a significant amount of residual material inside. The residue of these materials increases the residue rate inside the spraying machine, which does not meet the hygiene requirements of feed processing technology. On the other hand, the residual materials may fall off at any time. If material falls off when the discharge door of the spraying machine is closed, the material will fall onto the discharge door 301. When the cylinder 306 moves upward, it will not be able to close properly. The control system will issue an alarm for incomplete closing of the discharge door, thereby disrupting the continuity of the process and hindering the normal production. Summary of the Invention

[0007] The first objective of this invention is to provide a vacuum spraying machine to solve the technical problem of excessively high residue rates in existing vacuum spraying machines.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vacuum spraying machine, characterized in that it includes:

[0009] A cylindrical body, wherein a discharge port is provided at the bottom of the cylindrical body;

[0010] A discharge gate device is provided on the discharge port, including a discharge gate for closing and opening the discharge port, and for creating a gap between the discharge gate and the discharge port;

[0011] A cleaning device, including a fan assembly disposed on the cylinder, the fan assembly being used to inject air into the cylinder;

[0012] When the fan assembly operates, it injects air into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the fan assembly and discharged from the gap between the discharge gate and the discharge port, thereby cleaning the residue inside the spraying machine.

[0013] To address the problem of difficult-to-clean material residue inside spray painting machines, this invention, based on existing spray painting machines, adds a fan assembly. This fan assembly provides a certain airflow while simultaneously controlling the discharge gate, creating a narrow gap between the discharge gate and the discharge outlet. The material residue inside the spray painting machine is carried by the fan into the lower discharge outlet and then enters the lower buffer chamber through the gap, thus achieving the purpose of cleaning the residue inside the spray painting machine.

[0014] This invention cleans the residual material inside the sprayer after spraying, reducing residue and improving hygiene. Simultaneously, it prevents material spillage from causing the discharge door to not close properly, ensuring continuous production.

[0015] To further improve the technical solution of the present invention, the fan assembly is installed on the upper cover above the cylinder, so that the airflow passes through the spraying chamber from top to bottom, thoroughly cleaning the residual material.

[0016] To address the technical problem of how the fan assembly is implemented, the present invention adopts the following technical solution: the fan assembly includes a fan and a jetting pipe connected together; a valve and a pressure gauge are installed on the jetting pipe; the valve is used to control the flow of air in the jetting pipe; and the pressure gauge is used to observe the air pressure value in the jetting pipe.

[0017] This invention adds a spray pipe to the top cover of a vacuum spraying machine. A valve, preferably a pneumatic butterfly valve, is installed on the spray pipe to control the airflow. A pressure gauge is also installed on the spray pipe to monitor the air pressure readings.

[0018] To solve the technical problem of the power source for the discharge gate, the present invention adopts the following technical solution: the discharge gate device further includes a discharge gate drive device, which drives the discharge gate to move up and down, thereby realizing the opening and closing of the discharge port and the formation of a gap between the discharge gate and the discharge port.

[0019] To solve the technical problem of how to control the discharge gate device, the present invention adopts the following technical solution: the discharge gate device further includes a first limit switch, a second limit switch, a third limit switch, and a solenoid valve; the discharge gate device controls the up and down movement of the discharge gate through the solenoid valve; the discharge gate is provided with a first contact, a second contact, and a third contact.

[0020] The discharge gate drive device drives the discharge gate to move downward, the first contact triggers the first limit switch, the discharge gate opens to the position, and the discharge port is in a fully open state;

[0021] The discharge gate drive device drives the discharge gate to move upward, the second contact triggers the second limit switch, and a gap is formed between the discharge gate and the discharge port;

[0022] The discharge gate drive device drives the discharge gate to move upward, the third contact triggers the third limit switch, the discharge gate closes to the end, and the discharge port is in a fully closed state.

[0023] A second limit switch is added to the discharge gate. After the spraying machine finishes discharging material, the discharge gate prepares to close. Then, the solenoid valve is energized, and the discharge gate drive device moves upward. As the discharge gate drive device moves, when the second limit switch is triggered, the solenoid valve is de-energized and then moves to the neutral position. Because the solenoid valve is closed in the neutral position, once the solenoid valve moves to the neutral position, the discharge gate drive device will stop running and remain unchanged. At this time, an annular gap will be formed between the discharge gate and the discharge port.

[0024] When the discharge gate of the sprayer reaches the second limit switch position, the valve on the spray pipe opens, and then the blower starts working, injecting air into the sprayer. The air will enter the sprayer along the spray pipe and then be discharged from the bottom of the sprayer, passing through the annular gap between the discharge gate and the discharge port.

[0025] The timing begins when the blower starts working. When the blower's running time reaches the set value (which can be set according to actual working conditions), the blower stops working, and then the valve on the spray pipe closes. Then the discharge gate solenoid valve is energized, and the discharge gate drive device continues to move upward. When the third limit switch is triggered, the solenoid valve is de-energized, the discharge gate drive device stops moving, and the discharge gate closes completely.

[0026] To address the technical problem of inconvenient on-site adjustment of the second limit switch, this invention adopts the following technical solution: a pressure sensor is installed on the injection pipe to test the air pressure in the injection pipe. This invention allows for the pre-setting of an air pressure P0 (the specific value of which can be obtained through on-site testing), using this air pressure to replace the signal of the second limit switch. The closing position of the discharge gate can be determined based on the air pressure, facilitating on-site adjustment.

[0027] To further improve the technical solution of the present invention, the discharge gate is a discharge gate; a discharge flange is provided on the discharge port, and the discharge gate cooperates with the discharge flange to realize the closing and opening of the discharge port, and to form an annular gap between the discharge gate and the discharge port.

[0028] To address the technical problem of the non-continuous cleaning process, the present invention adopts the following technical solution: a cooler is installed below the cylinder of the vacuum spraying machine, and a fan is installed on the cooler.

[0029] During normal operation, the vacuum spraying machine is connected to a cooler below, and the cooler has a fan that draws air out to the outside. Therefore, the air volume generated by the fan on the spraying machine can be carried away by the fan in the cooler, thus ensuring the continuous feasibility of the entire cleaning process.

[0030] The second objective of this invention is to provide a cleaning method for a vacuum spraying machine, thereby solving the technical problem that residual materials inside existing vacuum spraying machines are difficult to clean.

[0031] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vacuum spraying machine cleaning method, characterized in that the cleaning method is implemented using any of the above-mentioned vacuum spraying machines.

[0032] To solve the above-mentioned technical problems, the present invention adopts the following technical solution, wherein the cleaning method includes the following steps:

[0033] (1) The discharge gate device controls the up and down movement of the discharge gate by means of a solenoid valve;

[0034] When the solenoid valve is energized, it drives the discharge gate to move downward through the discharge gate drive device. When the first contact on the discharge gate contacts the first limit switch, the gate is fully opened, the solenoid valve is de-energized, the discharge gate drive device stops running, and the spraying machine discharges material.

[0035] (2) After the spraying machine finishes discharging the material, the solenoid valve is energized and the discharge gate drive device drives the discharge gate to move upward. When the second contact on the discharge gate triggers the second limit switch, the solenoid valve is de-energized. At this time, the solenoid valve runs to the middle position and is closed in the middle position. The discharge gate drive device stops running and remains unchanged. A gap is formed between the discharge gate and the discharge port.

[0036] (3) When the fan assembly is working, air is injected into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the fan assembly and discharged from the gap between the discharge door and the discharge port to clean the residue inside the spraying machine.

[0037] (4) After cleaning is completed, the solenoid valve is energized and drives the discharge door upward through the discharge door drive device. When the third contact on the discharge door contacts the third limit switch, the door is closed in place; the solenoid valve is de-energized and the discharge door drive device stops running.

[0038] To address the problem of difficult-to-clean material residue inside spray painting machines, this invention, based on existing spray painting machines, adds a fan assembly. This fan assembly provides a certain airflow while simultaneously controlling the discharge gate, creating a narrow gap between the discharge gate and the discharge outlet. The material residue inside the spray painting machine is carried by the fan into the lower discharge outlet and then through the gap into the lower buffer chamber, thus achieving the purpose of cleaning the residue inside the spray painting machine.

[0039] This invention cleans the residual material inside the sprayer after spraying, reducing residue and improving hygiene. Simultaneously, it prevents material spillage from causing the discharge door to not close properly, ensuring continuous production. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of an existing vacuum spraying machine;

[0041] Figure 2 This is a schematic diagram of the discharge gate of an existing vacuum spraying machine;

[0042] Figure 3 This is a schematic diagram of the structure of the vacuum spraying machine of the present invention;

[0043] Figure 4 This is a schematic diagram of the material gate device of the vacuum spraying machine of the present invention;

[0044] Figure 5 This is a diagram showing the movement position of the discharge gate of the vacuum spraying machine of the present invention;

[0045] Figure 6 This is a diagram showing the adjustment of the blower operating conditions of the vacuum spraying machine of the present invention. In the diagram, a) is the system characteristic curve when the discharge gate is at position 1; b) is the system characteristic curve when the discharge gate is at position 2; and c) is the blower characteristic curve. Detailed Implementation

[0046] Example 1

[0047] like Figure 3-5 As shown, the spraying machine mainly consists of four parts: top cover 1, cylinder 2, discharge door device 3, and cleaning device.

[0048] The top cover 1 is located at the top of the spraying machine, and has a feed inlet and vacuum pipe on it. The cylinder 2 is preferably conical.

[0049] The cone body 2 is located at the bottom of the spraying machine, and the discharge port is set at the bottom of the cone body 2.

[0050] The cone body 2 is connected to the discharge gate device 3.

[0051] A discharge gate device is installed on the discharge port, including a discharge gate 301, used to close and open the discharge port and to create a gap between the discharge gate and the discharge port. The discharge gate is preferably a conical gate. A discharge flange 302 is provided on the discharge port, and the conical gate cooperates with the discharge flange 302 to close and open the discharge port and to create an annular gap between the discharge gate and the discharge port.

[0052] The discharge gate device further includes a discharge gate drive device 306, which drives the discharge gate 301 to move up and down, thereby opening and closing the discharge port and creating a gap between the discharge gate 301 and the discharge port. The discharge gate drive device 306 is preferably a cylinder.

[0053] The discharge gate device also includes control components, including a first limit switch 304, a second limit switch 307, a third limit switch 305, and a solenoid valve 303. The discharge gate device controls the up and down movement of the discharge gate 301 through the solenoid valve 303; the discharge gate is provided with a first contact, a second contact, and a third contact.

[0054] The discharge gate drive device 306 drives the discharge gate 301 to move downward, the first contact triggers the first limit switch 304, the discharge gate 301 is fully opened, and the discharge port is in the fully open state; the discharge gate drive device 306 drives the discharge gate 301 to move upward, the second contact triggers the second limit switch 307, and an annular gap is formed between the discharge gate 301 and the discharge port; the discharge gate drive device 306 drives the discharge gate 301 to move upward, the third contact triggers the third limit switch 305, the discharge gate 301 is fully closed, and the discharge port is in the fully closed state.

[0055] The discharge gate device controls the up-and-down movement of the discharge gate 301 via a solenoid valve 303. When the discharge gate 301 discharges material, the solenoid valve 303 is energized, which moves the discharge gate 301 downwards via the discharge gate drive device 306. When the first contact on the gate body contacts the first limit switch 304, the gate is fully open, the solenoid valve 303 is de-energized, and the discharge gate drive device 306 stops operating. After discharge is complete, the solenoid valve 303 is energized, which moves the gate body 301 upwards via the discharge gate drive device 306. When the contact on the gate body contacts the third limit switch 305, the gate is fully closed. Then, the solenoid valve 303 is de-energized, and the discharge gate drive device 306 stops operating.

[0056] A second limit switch 307 is added to the discharge gate 3. After the spraying machine finishes discharging material, the discharge gate 3 prepares to close. Then, the solenoid valve 303 is energized, and the discharge gate drive device 306 moves upward. As the discharge gate drive device moves, when the second limit switch 307 is triggered, the solenoid valve 303 is de-energized and then moves to the neutral position. Because the solenoid valve 303 is closed in the neutral position, once the solenoid valve moves to the neutral position, the discharge gate drive device will stop running and remain unchanged. At this time, an annular gap will be formed between the discharge gate 301 on the discharge gate 3 and the discharge gate flange 302. The overall position of the discharge gate device of the spraying machine also changes from... Figure 5 The object moves from position 1 to position 2.

[0057] The cleaning device, including a blower assembly, is mounted on the upper cover 1. The blower assembly is used to inject air into the cylinder 2. The blower assembly includes a connected blower 5 and a spray pipe 4. The spray pipe 4 is equipped with a valve 401 and a pressure gauge 402. The valve is used to control the airflow in the spray pipe, and the pressure gauge is used to observe the air pressure value in the spray pipe. A spray pipe 4 is added to the upper cover of the spraying machine. The spray pipe 4 has a valve 401, preferably a pneumatic butterfly valve, to control the airflow in the pipe. At the same time, there is also a pressure gauge 402 on the spray pipe 4 to observe the air pressure value in the spray pipe 4. When the blower assembly operates, it injects air into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the action of the blower assembly and discharged from the gap between the discharge gate and the discharge port, thus cleaning the residue inside the spraying machine.

[0058] When the discharge gate of the sprayer reaches position 2, valve 401 on the spray pipe 4 above the sprayer cover opens, and then the blower 5 starts working, injecting air into the sprayer. The air enters the sprayer along pipe 4 and then exits from the bottom of the sprayer. During exit, it passes through the annular gap between the discharge gate 301 and the discharge gate flange 302.

[0059] Timing begins when blower 5 starts operating. When the blower's operating time reaches the set value (which can be set according to actual working conditions), blower 5 stops operating, and then valve 401 on the blower pipe 4 closes. Then, the discharge gate solenoid valve 303 is energized, and the discharge gate drive device 306 continues to move upward. When the third limit switch 305 is triggered, the solenoid valve 303 is de-energized, the discharge gate drive device 306 stops operating, and the discharge gate closes completely.

[0060] A cooler is installed below the cylinder 2 of the vacuum spraying machine, and a fan is installed on the cooler. During normal operation, the cooler is connected to the bottom of the spraying machine, and the fan on the cooler draws air out to the outside. Therefore, the air volume generated by the fan on the spraying machine can be carried away by the fan on the cooler, thus ensuring the continuous feasibility of the entire cleaning process.

[0061] Example 2

[0062] The second limit switch 307 on the discharge gate 301, once set, cannot be changed arbitrarily. If the gap is found to be unsuitable, the position of the second limit switch 307 needs to be readjusted, and the effect retested. However, based on... Figure 6 As can be seen from the fan operating condition adjustment diagram, the air pressure at working point 1 when the discharge gate is in position 1 is different from that at working point 2 when it is in position 2. The reason is that the area of ​​the discharge gate of the spraying machine is different under different gap conditions, and the air resistance of the entire system is also different. Therefore, the pressure of the fan during operation is also different. Thus, the size of the gap can be determined by the change in fan pressure.

[0063] As a further improvement of the present invention, a pressure sensor 402 is added to the spray pipe 4 above the spraying machine to test the air pressure in the system. An air pressure P0 can be preset (the specific value of the air pressure P0 can be obtained through on-site testing) and used to replace the signal of the second limit switch 307. In this way, the position of the discharge door can be determined by using the air pressure, which is convenient for on-site adjustment.

[0064] Example 3

[0065] The vacuum spraying machine cleaning method, implemented using the vacuum spraying machine of Example 1 or 2, specifically includes the following steps:

[0066] (1) The discharge gate device controls the up and down movement of the discharge gate through a solenoid valve;

[0067] When the solenoid valve is energized, it drives the discharge gate to move downward through the discharge gate drive device. When the first contact on the discharge gate contacts the first limit switch, the gate is fully opened, the solenoid valve is de-energized, the discharge gate drive device stops running, and the spraying machine discharges material.

[0068] (2) After the spraying machine finishes discharging the material, the solenoid valve is energized and the discharge gate drive device drives the discharge gate to move upward. When the second contact on the discharge gate triggers the second limit switch, the solenoid valve is de-energized. At this time, the solenoid valve runs to the middle position and is closed in the middle position. The discharge gate drive device stops running and remains unchanged, forming a gap between the discharge gate and the discharge port.

[0069] (3) When the blower assembly is working, air is injected into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the blower assembly and discharged from the gap between the discharge door and the discharge port, thus cleaning the residue inside the spraying machine.

[0070] (4) When cleaning is completed, the solenoid valve is energized and drives the discharge door upward through the discharge door drive device. When the third contact on the discharge door contacts the third limit switch, the door is closed in place; the solenoid valve is de-energized and the discharge door drive device stops running.

[0071] The advantages of the vacuum spraying machine cleaning method of the present invention will be demonstrated from the aspects of wind speed and wind pressure. The cleaning method of the present invention can ensure that the wind speed and wind pressure passing through the annular gap are greater, thereby ensuring that there is enough force to remove the residue remaining inside the spraying machine.

[0072] Because the exhaust area of ​​the entire spraying machine's discharge gate is reduced, according to the gas continuity equation:

[0073]

[0074] Because the area A2 of discharge gate position 2 is smaller than the area A1 of discharge gate position 1, and the gas flow is continuous, the gas velocity V2 at position 2 is greater than the other velocities V1 at position 1. This is more conducive to carrying the residue inside the sprayer into the buffer chamber below. During normal operation, the sprayer is connected to a cooler, which has a fan that draws air outwards. Therefore, the airflow generated by the fan on the sprayer can be carried away by the fan in the cooler, thus ensuring the continuous feasibility of the entire cleaning process.

[0075] At the same time, with the help of Figure 6 The fan operating condition adjustment diagram shows that when the sprayer's discharge gate is in position 2, the overall air resistance of the sprayer increases (because the discharge gate moves upward, reducing the discharge area, thus increasing the air resistance). The system characteristic curve of the sprayer shifts from curve a to curve b. However, once the fan is selected and operating at its rated speed, the fan performance curve remains unchanged, as shown by curve c in the diagram. The sprayer system characteristic curve a intersects with the fan characteristic curve c at point 1, and curve b intersects with the fan curve c at point 2. Point 1 represents the parameter point for fan operation when the discharge gate is in position 1. Point 2 represents the parameter point for fan operation when the discharge gate is in position 2.

[0076] Based on the fan performance curve c, it can be seen that the fan pressure P2 in state 2 is higher than the pressure P1 in state 1, which is more conducive to the fan carrying the material away from the sprayer. Although the air volume Q2 in state 2 is reduced compared to Q1 in state 1, this can be compensated for by reserving a certain amount of air volume in advance when selecting the fan.

[0077] This invention increases air pressure and speed by adding a fan to blow air into the spraying machine and adjusting the position of the discharge gate, ensuring that the air passes through the discharge gate with a smaller area. This can remove residual material from the spraying machine, reducing the residue rate, and also prevent material from falling onto the discharge gate when it is closed, thus avoiding the problem of incomplete closure.

[0078] The invention involves minimal structural changes and, in conjunction with the action of the conical discharge gate, enables the removal of residual materials from the spraying machine using a smaller fan. The overall investment is low, and the effect is significant.

Claims

1. A vacuum spraying machine, characterized in that, include: A cylindrical body, wherein a discharge port is provided at the bottom of the cylindrical body; A discharge gate device is provided on the discharge port, including a discharge gate for closing and opening the discharge port, and for creating a gap between the discharge gate and the discharge port; A cleaning device, including a fan assembly disposed on the cylinder, the fan assembly being used to inject air into the cylinder; When the fan assembly operates, air is injected into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the fan assembly and discharged from the gap between the discharge door and the discharge port, thereby cleaning the residue inside the spraying machine. The discharge gate device also includes a discharge gate drive device, which drives the discharge gate to move up and down, thereby opening and closing the discharge port and forming a gap between the discharge gate and the discharge port. The discharge gate device further includes a first limit switch, a second limit switch, a third limit switch, and a solenoid valve; the discharge gate device controls the up and down movement of the discharge gate through the solenoid valve; the discharge gate is provided with a first contact, a second contact, and a third contact; The discharge gate drive device drives the discharge gate to move downward, the first contact triggers the first limit switch, the discharge gate opens to the position, and the discharge port is in a fully open state; The discharge gate drive device drives the discharge gate to move upward, the second contact triggers the second limit switch, and a gap is formed between the discharge gate and the discharge port; The discharge gate drive device drives the discharge gate to move upward, the third contact triggers the third limit switch, the discharge gate closes to the end, and the discharge port is in a fully closed state.

2. The vacuum spraying machine according to claim 1, characterized in that, The fan assembly is mounted on the top cover above the cylinder.

3. The vacuum spraying machine according to claim 2, characterized in that, The blower assembly includes a blower and a jet pipe connected together. The jet pipe is equipped with a valve and a pressure gauge. The valve is used to control the flow of air in the jet pipe, and the pressure gauge is used to observe the air pressure value in the jet pipe.

4. The vacuum spraying machine according to claim 3, characterized in that, A pressure sensor is installed on the jet pipe to test the air pressure in the jet pipe.

5. The vacuum spraying machine according to claim 4, characterized in that, The discharge gate is a conical gate; a discharge flange is provided on the discharge port, and the conical gate cooperates with the discharge flange to realize the closing and opening of the discharge port, and to form an annular gap between the discharge gate and the discharge port.

6. The vacuum spraying machine according to claim 1, characterized in that, A cooler is installed below the cylinder of the vacuum spraying machine, and a fan is installed on the cooler.

7. A vacuum spraying machine cleaning method, characterized in that, The cleaning method is implemented using the vacuum spraying machine according to any one of claims 1-6.

8. The vacuum spraying machine cleaning method according to claim 7, characterized in that, The cleaning method includes the following steps: (1) The discharge gate device controls the up and down movement of the discharge gate by means of a solenoid valve; When the solenoid valve is energized, it drives the discharge gate to move downward through the discharge gate drive device. When the first contact on the discharge gate contacts the first limit switch, the gate is fully opened, the solenoid valve is de-energized, the discharge gate drive device stops running, and the spraying machine discharges material. (2) After the spraying machine finishes discharging the material, the solenoid valve is energized and the discharge gate drive device drives the discharge gate to move upward. When the second contact on the discharge gate triggers the second limit switch, the solenoid valve is de-energized. At this time, the solenoid valve runs to the middle position and is closed in the middle position. The discharge gate drive device stops running and remains unchanged. A gap is formed between the discharge gate and the discharge port. (3) When the fan assembly is working, air is injected into the cylinder. The material remaining inside the cylinder is carried into the discharge port by the fan assembly and discharged from the gap between the discharge door and the discharge port to clean the residue inside the spraying machine. (4) After cleaning is completed, the solenoid valve is energized and drives the discharge door upward through the discharge door drive device. When the third contact on the discharge door contacts the third limit switch, the door is closed in place; the solenoid valve is de-energized and the discharge door drive device stops running.

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