A vacuum spray coater

Abstract

The present application relates to a kind of vacuum spray machine, specifically includes: shell, the shell is used to accommodate and carry out spraying to the material that is passed in;Discharge door flange, the discharge door flange is located in the lower end of the shell and includes discharge port, the inboard of the discharge port is provided with sealing element;Discharge door, the discharge door is configured to the lower end of the discharge door flange, and can be moved up and down to realize that it closes or opens the discharge port, the discharge door is tightly attached to the sealing element when the discharge port is closed by the discharge door moving up;Sealing device, the sealing device is arranged on the discharge door flange and includes the first sealing element that can be moved up and down with the discharge door moving up or moving down, the first sealing element is wrapped in the inboard of the sealing element when the discharge port is opened by the discharge door;The present application can effectively prevent sealing element to stick material and thereby cause the occurrence of leakage.

Description

Technical Field

[0001] This invention relates to the field of feed machinery, and more specifically to a vacuum spraying machine. Background Technology

[0002] Vacuum spraying machines, as a type of feed mixing machinery, are mainly used for mixing feed with various additives, such as feed and oil. After the material enters the vacuum spraying machine, it is stirred and sprayed with oil, which can form a layer of highly viscous oil on the surface of the material. At this time, the material is very easy to stick together.

[0003] After the coating machine has finished mixing and the discharge gate is opened, the material is discharged from the vacuum coating machine through the discharge gate. During this discharge process, highly viscous materials often stick to the discharge port, and even to the various sealing elements installed on the side of the discharge port. When the discharge is finished and the discharge gate closes to the discharge port again, the stuck material will be crushed and prevent the discharge gate from closing tightly with the sealing elements, resulting in leakage problems in the subsequent spraying and mixing process. Summary of the Invention

[0004] To address the aforementioned issues, this paper provides a technical solution that effectively ensures a tight fit between the sealing element and the discharge gate, as detailed below.

[0005] A vacuum spraying machine includes: a housing for receiving and spraying materials introduced into the housing; a discharge door flange located at the lower end of the housing and including a discharge port, wherein a sealing element is provided on the inner ring of the discharge port; a discharge door located at the lower end of the discharge door flange and movable up and down to close or open the discharge port, wherein when the discharge door moves up to close the discharge port, the outer side of the discharge door is in close contact with the sealing element; and a sealing device located on the discharge door flange and including a first sealing element movable up and down as the discharge door moves up or down, wherein the first sealing element covers the inner side of the sealing element when the discharge door opens the discharge port.

[0006] The above-mentioned sealing device ensures that when the discharge gate opens the discharge port, the first sealing element can cover the inner side of the sealing element, thereby preventing a lot of material from sticking to the sealing element. Furthermore, the first sealing element can be set to move with the movement of the discharge gate, that is, gradually opening the sealing element as the discharge gate rises and gradually covering the sealing element as the discharge gate falls.

[0007] In one embodiment, the discharge gate is configured as a conical discharge gate, and the lower end of the first sealing member is provided with a fitting slope. When the conical discharge gate is in an upward state and closes the discharge port, the outer conical surface of the discharge gate is in close contact with the fitting slope.

[0008] By setting the beveled surface, the sealing effect of the discharge gate when closing the discharge port can be further guaranteed. Specifically, when the discharge gate rises and closes the discharge port, in addition to the sealing of the sealing element itself, the beveled surface at the lower end of the first sealing element will be tightly attached to the discharge port to achieve further sealing.

[0009] In one embodiment, the inner side of the discharge gate flange near the housing is provided with an installation groove, and one end of the first sealing member is disposed in the installation groove and can move up and down in the installation groove.

[0010] The mounting groove ensures that the first seal has sufficient room to move, allowing it to move smoothly.

[0011] In one embodiment, the sealing device further includes a spring, one end of which is disposed in the discharge gate flange and the other end is connected to the first sealing element;

[0012] When the discharge gate moves upward and contacts the first seal, the first seal forces the spring to press upward;

[0013] As the discharge gate moves downward and gradually loosens the first seal, the spring pushes the first seal downward.

[0014] In one embodiment, the spring is disposed in an installation groove opened inside the discharge gate flange, and the sealing device further includes: a cover plate, the cover plate being fixedly disposed at the upper end of the installation groove; a fixing post, the fixing post being disposed in the installation groove, the upper end of the fixing post being connected to the cover plate, the lower end of the fixing post being connected to the discharge gate flange, one end of the spring and one end of the first sealing member being sleeved on the fixing post, one end of the spring abutting against the cover plate, and the other end abutting against the first sealing member.

[0015] In one embodiment, the first sealing element includes: a connecting end, which is sleeved on the fixed post and abuts against the spring; and a closing end, which is configured to be bent inward from the connecting end, such that the closing end is perpendicular to the connecting end, and the fitting inclined surface is provided on the lower end surface of the closing end.

[0016] The vertical setting ensures that the force on the closed end during the rising process is basically vertically upward, without generating too much oblique component force, which could lead to the breakage of the first seal.

[0017] In one embodiment, the lower end of the discharge port is provided with a first inclined surface adapted to the conical surface, and the sealing element is configured as a sealing ring and disposed inside the first inclined surface. The first inclined surface and the fitting inclined surface are on the same inclined surface when the discharge port is in a closed state.

[0018] In one embodiment, the sealing device further includes a second seal, which is connected to the inner side of the cover plate and located inside the first seal.

[0019] In one embodiment, the lower end of the second seal is provided with a second inclined surface adapted to the conical surface, and the lower end of the second inclined surface is disposed on the side of the first seal facing the discharge gate, such that when the discharge gate closes the discharge port, the first inclined surface, the second inclined surface, and the fitting inclined surface are all on the same inclined surface.

[0020] In one embodiment, the first sealing element is configured to cooperate with the discharge door flange slide rail, and the inner side of the discharge door flange is provided with a slide rail or slide groove, and the side of the first sealing element connected to the discharge door flange is adapted to be equipped with a slide groove or slide rail.

[0021] In one embodiment, the upper end of the second seal is provided with a third inclined surface on the side near the housing, and the third inclined surface gradually slopes inward and downward from the side near the housing.

[0022] In one embodiment, a guide plate is installed inside the housing, the guide plate is disposed above the discharge port, and the guide plate is configured to be inclined toward the discharge port.

[0023] In one embodiment, a plurality of blowing devices are installed on the outside of the discharge gate flange, which are evenly distributed axially around the discharge gate flange. The blowing device includes: a blowing pipe disposed around the outside of the discharge gate flange, the blowing pipe being used to introduce blowing gas; and a nozzle, the nozzle being connected to the blowing pipe and facing the discharge gate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the operation of a vacuum spraying machine;

[0025] Figure 2 This is a schematic diagram of the structure when the discharge gate is open;

[0026] Figure 3 This is a magnified view of a portion of the material discharge gate when it is open.

[0027] Figure 4 This is a magnified view of a portion of the material discharge gate when it is closed.

[0028] In the diagram: 1. Shell; 2. Screwdriver; 3. Discharge device; 4. Guide plate; 5. Spray nozzle; 6. Seal;

[0029] 31. Discharge gate flange; 32. Discharge gate; 33. Drive unit; 34. Sealing device; 35. Blowing device;

[0030] 311. Discharge port; 312. Mounting groove; 313. First inclined surface;

[0031] 321. Conical surface;

[0032] 341. Cover plate; 342. Fixing post; 343. Spring; 344. First seal; 345. Second seal;

[0033] 351. Blowing pipe; 352. Air inlet pipe; 353. Nozzle;

[0034] 3411. Mounting holes;

[0035] 3441. Fitting bevel; 3442. Closed end; 3443. Connecting end; 3444. Abutment hole;

[0036] 3451, Second inclined plane; 3452, Third inclined plane. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] Please refer to the following: Figure 1 As shown, the vacuum spraying machine includes a housing 1, inside which is a rotatable auger 2. When the auger 2 rotates in the forward direction, it can drive the material to rise and spray it through the spray nozzle 5 at the upper end of the housing 1. When the auger 2 rotates in the reverse direction, it is used to discharge the material. Specifically, after the material is sprayed, the auger 2 will rotate in the reverse direction to discharge the material. A discharge device 3 is installed at the lower end of the housing 1. After the material is sprayed, it is discharged from the discharge device 3.

[0044] Please refer to Figure 2 As shown, the discharge device 3 includes a discharge gate flange 31 installed at the lower end of the housing 1, and a discharge gate 32 located at the lower end of the discharge gate flange 31. The discharge gate flange 31 includes a discharge port 311, which is used to discharge the material in the housing 1.

[0045] After spraying, the material generally has a high viscosity. During the discharge process, it often sticks to the discharge port and the sealing element inside the discharge port. As a result, after the discharge is completed and the discharge gate closes the discharge port again, some of the material stuck to the discharge port will be squeezed out. At the same time, because the material is stuck to the sealing element, the discharge gate cannot achieve a complete fit with the sealing element, and gaps appear between the two. Thus, during the continued material spraying process, problems such as air leakage, oil leakage, and material leakage will occur.

[0046] To solve the above problems, a sealing element 6 is installed inside the discharge port 311 in this case, and the discharge door 32 is configured to move up and down. Specifically, a driving device 33 is installed on the lower side of the discharge door 32. The driving device 33 drives the discharge door 32 to move up and down to open or close the discharge port 311. That is, when the discharge door 32 rises, the discharge port 311 is in a closed state, and when the discharge door 32 falls, the discharge port 311 is in an open state. When the discharge door 32 is in a closed state, the discharge door 32 abuts against the sealing element 6 to achieve a seal. It should be understood that the driving device 33 can be a cylinder as shown in the figure. Since the driving device 33 can adopt the driving method in the prior art, it will not be described in detail here.

[0047] Please also refer to Figure 2 , Figure 3 As shown, a sealing device 34 is also installed on the discharge gate flange 31. The sealing device 34 includes a first sealing element 344. The first sealing element 344 is disposed on the discharge gate flange 31 and can move up and down with the discharge gate 32. Specifically, when the discharge gate 32 moves upward, it can drive the first sealing element 344 to move upward. When the discharge gate 32 moves downward to open the discharge port 311, the first sealing element 344 moves downward and covers the inner side of the sealing element 6. Here, the inner side refers to the side of the sealing element 6 that is closer to the center of the discharge port 311.

[0048] With the above structure, when the discharge gate 31 moves downward and the discharge port 311 opens, the material will not come into contact with the sealing element 6 during the falling process. As a result, no material will stick to the sealing element 6. When the discharge gate 31 closes again, there will be no problem of poor sealing between the discharge gate 31 and the sealing element 6 due to the sticking material. Furthermore, when the discharge gate 31 rises and drives the first sealing element 344 to rise, the discharge gate 31 can achieve a tight fit and compression with the sealing element 6. That is, the use of the first sealing element 344 can ensure that the sealing element 6 will not be stuck by the material, and thus can also cooperate with the sealing element 6 and the discharge gate 32 to seal when they are in the closed state.

[0049] There are many ways to realize the up-and-down movement of the first seal 344. For example, the first seal 344 can be connected to the discharge door flange 31 by a slide rail. Specifically, the discharge door flange 31 is provided with a slide rail (not shown) on the inner side, and the first seal 344 is provided with a slide groove (not shown) on the side connected to it. The first seal 344 slides on the discharge door flange 31. Of course, the above two structures can be interchanged and can achieve the same effect.

[0050] During the upward movement of the discharge gate 31, the first seal 344 is pushed upward. During the downward movement of the discharge gate 31, the first seal 344 naturally descends due to gravity. Alternatively, the first seal 344 and the discharge gate flange 31 may be driven by a connecting cylinder. Therefore, there are many structures that can achieve the upward and downward movement of the first seal 344, which will not be listed here. However, it should be understood that when the upward and downward movement of the first seal 344 is used to solve the problem of preventing material from sticking to the seal 6, this solution should fall within the scope of protection required by this application.

[0051] Please continue to refer to Figure 3. In one embodiment, the discharge gate 32 is configured as a conical structure discharge gate, which includes a conical surface 321. The lower end of the first sealing member 344 is provided with a fitting inclined surface 3441 adapted to the lower end of the conical surface 321. That is, when the discharge gate 32 is in a closed state, the conical surface 321 and the fitting inclined surface 3441 are tightly fitted to achieve further sealing.

[0052] Please refer to Figure 4 As shown in the closed state, when in the closed state, the discharge gate 32 is tightly fitted with the fitting inclined surface 3441 and the sealing element 6 respectively. For materials to pass through the discharge gate 32, they need to break through the first sealing element 344 and the sealing element 6 respectively. The above settings effectively increase the sealing area, and the sealing effect is better than that of conventional sealing rings.

[0053] Please continue to refer to this. Figure 4 As shown, in one embodiment, the lower end of the discharge gate flange 31 is provided with a first inclined surface 313, and the sealing element 6 is configured as a sealing ring and is provided on the first inclined surface 313. The first inclined surface 313 is configured such that when the discharge gate 32 is raised and in the closed state, the first inclined surface 313 and the fitting inclined surface 3441 are on the same inclined surface. Thus, when the discharge gate 32 is raised and in the closed state, the fitting inclined surface 3441 and the first inclined surface 313 can prevent the fact that there is basically no positional difference between multiple fitting surfaces, thereby better preventing material leakage.

[0054] refer to Figure 3 , Figure 4As shown, in one embodiment, the discharge gate flange 31 has an installation groove 312 at one end near the housing 1. The first sealing member 344 is movably disposed in the installation groove 312. Specifically, the first sealing member 344 can move up and down in the installation groove 312. The installation groove 312 ensures the movement space of the first sealing member 344.

[0055] In one embodiment, a cover plate 341 is installed on the upper end of the mounting groove 312. The cover plate 341 is configured as an annular structure with a central hole, the central hole corresponding to the size of the discharge port 311. The upper end of the mounting groove 312 can be configured as a stepped groove structure, and the cover plate 341 is engaged in the stepped groove. Of course, the above mounting structure is not unique, as long as the cover plate 341 can be installed on the upper end of the mounting groove 312.

[0056] A fixing post 342 is provided in the mounting groove 312. The upper end of the fixing post 342 is connected to the cover plate 341, and the lower end is connected to the discharge door flange 31. Specifically, the fixing post 342 can be configured as a stud or bolt, and the cover plate 341 and the discharge door flange 31 are connected by screwing. One end of the first sealing member 344 is sleeved on the fixing post 342, so that the first sealing member 344 can move up and down along the fixing post 342.

[0057] In another embodiment, a spring 343 is installed in the mounting groove 312. One end of the spring 343 abuts against the discharge gate flange 31, and the other end abuts against the first seal 344. With the above structure, it can be ensured that after the first seal 344 is gradually raised under pressure, the spring 343 will accumulate a certain spring force. When the discharge gate 32 descends and gradually opens the discharge port 311, the spring 343 will pop out the first seal 344 due to its own spring force. This setting can prevent the material from getting stuck at the moving end of the first seal 344 during the discharge process, causing the first seal 344 to move unsmoothly, and thus unable to move down by its own weight alone.

[0058] In one embodiment, the spring 344 is sleeved on the fixing post 342, with one end connected to the cover plate 341 and the other end connected to the first sealing member 344, so that the spring 344 itself is supported by the fixing post 342.

[0059] refer to Figure 4 As shown, the cover plate 341 has a mounting hole 3411. One end of the fixing post 342 connected to the cover plate 341 is inserted into the mounting hole 3411. The spring 343 is sleeved on the fixing post 342, and one end of it is inserted into the mounting hole 3411 and abuts against the discharge gate flange 31.

[0060] In one embodiment, the first sealing member 344 includes a connecting end 3443 sleeved on the fixing post 342, the connecting end 3443 having an abutment hole 3444, the fixing post 342 passing through the abutment hole 3444, and one end of the spring 343 abutting against the first sealing member 344 being disposed in the abutment hole 3444 and abutting against the connecting end 3443.

[0061] The first sealing element 344 also includes a closed end 3442 connected to the connecting end 3443. The closed end 3442 is perpendicular to the connecting end 3443, that is, the two are at a right angle at the connection transition, and the fitting slope 3441 is provided at the lower end of the closed end 3442.

[0062] The above structure ensures that the main force on the closed end 3442 during contact with the discharge gate 32 is an upward thrust, without excessive component force that could cause the first seal 344 to break.

[0063] The above-described solution provides many technical solutions to prevent the seal 6 from sticking to the material and causing poor sealing. However, in actual operation, many other problems may occur. For example, material may easily enter the sealing device 34 during the discharge process. If the material enters the mounting groove 312, the first seal 344 may not be able to move effectively. In order to solve the above problems, the present invention provides corresponding solutions, as follows.

[0064] Please refer to Figure 3 , Figure 4 As shown, a second seal 345 is installed on the inner side of the cover plate 341, that is, on the side facing the center of the discharge gate 32. The second seal 345 is also disposed on the inner side of the first seal 344, that is, on the side facing the center of the discharge gate 32. The configuration of the second seal 345 can effectively prevent material from entering the mounting groove 312.

[0065] In one embodiment, a second inclined surface 3451 is provided at the lower end of the second seal 345. The lower end of the second inclined surface 3451 is disposed inside the first seal 344, that is, on the side close to the center of the discharge gate 32. The arrangement of the second inclined surface 3451 allows the first seal 344 to move upward when the discharge gate 32 rises, even if the material adheres to the inside of the first seal 344 when the material is discharged. Since the second inclined surface 3451 is close to the inside of the first seal 344, the second inclined surface 3451 can remove the material adhering to the inside of the first seal 344, further ensuring the working environment of the first seal 344.

[0066] refer to Figure 4As shown, when the discharge gate 32 is in a closed state, the fitting slope 3441, the first slope 313 and the second slope 3451 are on the same slope. Therefore, material leakage needs to pass through three layers of sealing, namely the inner second slope 3451, the first slope 313 and the fitting slope 3441. The sealing area is large and leakage is difficult.

[0067] In one embodiment, the second seal 345 and the cover plate 341 can be connected by welding.

[0068] It should be understood that the first seal 344 and the second seal 345 are respectively located on one side of the discharge gate flange 31 and the inside of the cover plate 341. Both the discharge gate flange 31 and the cover plate 341 are circular structures. Therefore, the overall structure of the first seal 344 and the second seal 345 adapted to the discharge gate flange 31 and the cover plate 341 should also be a circular structure.

[0069] Please continue to refer to this. Figure 4 As shown, the upper end of the second seal 345 is also provided with a third inclined surface 3452. The lower end of the third inclined surface 3452 is inclined towards the center of the discharge gate 32. This arrangement can prevent material from accumulating on the second seal 345 during the discharge process.

[0070] The above scheme shows the specific structure of the second seal 345 and its purpose of use. However, it should be understood that during the discharge process, it is desirable to prevent the material from touching the seal 6, the first seal 344, and even the second seal 345, so as to ensure the sealing effect of the discharge gate 32 when it is closed. To this end, the present invention also provides the following matching scheme, as follows.

[0071] Please refer to Figure 1 , 2 As shown in Figure 3, a guide plate 4 is provided inside the housing 1. Specifically, the guide plate 4 is inclinedly disposed on the side of the lower end of the housing 1 near the discharge port 311. The inclined direction of the guide plate 4 is towards the discharge port 311, and the guide plate 4 can be configured such that the material flow discharged on it is directed towards the center of the discharge port 311. Thus, the configuration of the guide plate 4 can further prevent the material from sticking to the first seal 344 and the second seal 345.

[0072] A blowing device 35 is also provided on the outside of the discharge gate flange 31. The discharge device 35 includes a blowing pipe 351 arranged around the outside of the discharge gate flange 31. Blowing gas, which can be compressed air, is introduced into the blowing pipe 351. Several air receiving pipes 352 are evenly distributed around the lower end of the blowing pipe 351. Nozzles 353 are installed at the lower end of the air receiving pipes 352. The nozzles 353 are configured to bend toward the center of the discharge port 311.

[0073] The configuration of the blowing device 35 ensures that the material is kept in the center of the discharge port 311 during the discharge process, and does not splash, causing the material to stick to the sealing device 34.

[0074] The combination of the above-mentioned structures ensures that the material is difficult to stick to the sealing device 34 and the sealing element 6 during the discharge process, thus ensuring the sealing effect of the discharge gate 32 when it is closed.

[0075] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Furthermore, the contents not described in detail in this specification are all prior art known to those skilled in the art.

Claims

1. A vacuum spraying machine, characterized in that, include: A housing for containing and spraying the introduced material; A discharge gate flange is provided at the lower end of the housing and includes a discharge port, and a sealing element is provided on the inner side of the discharge port; The discharge gate is located at the lower end of the discharge gate flange and can move up and down to close or open the discharge port. When the discharge gate moves up to close the discharge port, the outer side of the discharge gate is in close contact with the sealing element. The mounting groove is located on the inner side of the discharge gate flange near one end of the housing; A sealing device is provided on the discharge gate flange and includes a first sealing element provided in the mounting groove that can move up and down in the mounting groove as the discharge gate moves up or down. The first sealing element covers the inner side of the sealing element when the discharge gate opens the discharge port. The sealing device also includes a cover plate fixedly disposed at the upper end of the mounting groove; The sealing device further includes a second sealing element, which is connected to the inner side of the cover plate and located inside the first sealing element.

2. The vacuum spraying machine according to claim 1, characterized in that, The discharge gate is configured as a conical discharge gate, and the lower end of the first sealing element is provided with a fitting slope. When the conical discharge gate moves upward and closes the discharge port, the outer conical surface of the discharge gate is in close contact with the fitting slope.

3. A vacuum spraying machine according to claim 2, characterized in that, The sealing device also includes a spring, one end of which is disposed in the discharge gate flange and the other end is connected to the first sealing element; When the discharge gate moves upward and contacts the first seal, the first seal forces the spring to press upward; As the discharge gate moves downward and gradually loosens the first seal, the spring pushes the first seal downward.

4. A vacuum spraying machine according to claim 3, characterized in that, The spring is disposed in a mounting groove opened inside the discharge gate flange, and the sealing device further includes: A fixing post is provided in the mounting groove, with its upper end connected to the cover plate and its lower end connected to the discharge gate flange. One end of the spring and one end of the first sealing element are both sleeved on the fixing post, with one end of the spring abutting against the cover plate and the other end abutting against the first sealing element.

5. A vacuum spraying machine according to claim 4, characterized in that, The first seal includes: The connecting end is sleeved on the fixed post and abuts against the spring. The closed end is configured to be bent inward from the connecting end, such that the closed end is perpendicular to the connecting end, and the fitting inclined surface is provided on the lower end surface of the closed end.

6. A vacuum spraying machine according to claim 2, characterized in that, The lower end of the discharge port is provided with a first inclined surface adapted to the conical surface, and the sealing element is configured as a sealing ring and disposed inside the first inclined surface. The first inclined surface and the fitting inclined surface are on the same inclined surface when the discharge port is in a closed state.

7. A vacuum spraying machine according to claim 6, characterized in that, The lower end of the second seal is provided with a second inclined surface that is adapted to the conical surface, and is configured such that when the discharge gate closes the discharge port, the first inclined surface, the second inclined surface, and the fitting inclined surface are all on the same inclined surface.

8. A vacuum spraying machine according to claim 1, characterized in that, The first sealing element cooperates with the discharge door flange slide rail. The inner side of the discharge door flange is provided with a slide rail or slide groove. The side of the first sealing element connected to the discharge door flange is adapted to be equipped with a slide groove or slide rail.

9. A vacuum spraying machine according to claim 7, characterized in that, The second seal has a third inclined surface on the side of its upper end near the housing, and the third inclined surface gradually slopes inward and downward from the side near the housing.

10. A vacuum spraying machine according to claim 1, characterized in that, A guide plate is installed inside the housing, the guide plate is located at the upper end of the discharge port, and the guide plate is configured to be inclined toward the center of the discharge port.

11. A vacuum spraying machine according to claim 1 or 9, characterized in that, A plurality of blowing devices are installed on the outside of the discharge gate flange, evenly distributed axially around the discharge gate flange. The blowing devices include: A blowing pipe is provided around the outer edge of the discharge gate flange, and the blowing pipe is used to introduce blowing gas. The nozzle is connected to the blowing pipe and faces the discharge gate.

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