Vacuum pickup tube control device

Abstract

The application provides a vacuum suction pipe control device, and relates to the technical field of material conveying equipment. The device comprises a tank body, a sealing cover for sealing the tank body, a suction pipe through opening provided in the sealing cover, a negative pressure source connected to one end of the suction pipe, and the other end of the suction pipe penetrating through the suction pipe through opening and entering the inside of the tank body. A suction pipe connecting ring is arranged at the lower end of the suction pipe. A rocker movable opening is provided in the sealing cover, a rigid rocker is arranged in the rocker movable opening, a rocker connecting ring is arranged at the lower end of the rigid rocker, the rocker connecting ring is connected to the suction pipe connecting ring, an upper telescopic sealing sleeve and a lower telescopic sealing sleeve are fixedly connected to the rigid rocker and cover the rocker movable opening from above and below respectively, and the suction pipe is a flexible pipe. The vacuum suction pipe control device is used for controlling the angle of the rigid rocker outside the tank body, and based on the connection between the rocker connecting ring and the suction pipe connecting ring, the position of the end of the suction pipe at the bottom of the tank body is adjusted, so that the suction pipe can suck the material outside the central position of the bottom of the tank body.

Description

Technical Field

[0001] This application relates to the field of material conveying equipment technology, and more specifically, to a vacuum suction pipe control device. Background Technology

[0002] Vacuum suction pipes create a negative pressure environment within the pipe using a vacuum pump or negative pressure fan, causing materials to flow with the airflow under pressure difference, thus completing the conveying from the feeding point to the unloading point. They are widely used in industries such as food, chemicals, plastics, and building materials, for example, conveying resin granules, cement powder, or plastic raw materials. However, with flexible materials, it is difficult to control the position of the suction pipe end within the container. Current production processes typically involve repeatedly pulling and inserting the suction pipe to change its position within the container. This method easily introduces external impurities into the container, affecting raw material safety, especially in the food, health product, and pharmaceutical industries, where it severely impacts aseptic production processes. To address this problem, existing technologies include: (1) Chinese utility model patent with publication number CN202238461U discloses a rotating structure for a spray gun suction pipe. It includes a material tank cover and a bent suction pipe. The middle part of the material tank cover extends upward to form a connecting part. The rotating structure also includes a rotating handle and a suction sleeve fixedly sleeved on the upper end of the suction pipe. The suction sleeve is embedded in the material tank cover. The inner end of the rotating handle extends into the material tank cover and is fixedly connected to the suction sleeve. The outer end is located outside the material tank cover and has a grip part.

[0003] This solution enables the suction of materials distributed around the periphery of the container, but the suction pipe used in this solution is unable to suck up materials located in the center of the container.

[0004] (2) European Patent Publication No. EP0951856A2 discloses a suction device for solids and / or liquids, comprising a suction unit and a container unit for the material to be suctioned, which are interconnected by a pipe connecting the outlet of the container unit to the inlet of the suction unit. Each unit includes a distinctly independent receiver, each receiver being equipped with its own suction device for separating the material sucked in by the suction hose connected to the inlet of the container unit from the material to be suctioned, and guiding it to the outside through the discharge hose connected to the outlet of the suction unit.

[0005] This solution can only adjust the relative height of the end of the suction hose inside the container, and there is no possibility that the suction hose will touch the bottom of the container. Summary of the Invention

[0006] To solve the above problems, the technical solution adopted in this application is a vacuum suction pipe control device, including a tank and a sealing cover of the tank. The sealing cover has a through-hole for the suction pipe. One end of the suction pipe is connected to a negative pressure source, and the other end passes through the suction pipe through-hole into the tank. A suction pipe connecting ring is provided at the lower end of the suction pipe. A rocker arm movable opening is provided through the sealing cover. A rigid rocker arm is provided in the rocker arm movable opening. A rocker arm connecting ring is provided at the lower end of the rocker arm. The rocker arm connecting ring is connected to the suction pipe connecting ring. An upper telescopic sealing sleeve is fixedly connected to the rocker arm to cover the rocker arm movable opening from above, and a lower telescopic sealing sleeve is fixedly connected to the rocker arm to cover the rocker arm movable opening from below. The suction pipe is a flexible tube, and the length of the suction pipe inside the tank is greater than the height of the tank.

[0007] Optionally, the lower end of the suction tube has a funnel-shaped opening.

[0008] Optionally, a lower fixing ring is evenly provided around the outer wall of the flared opening, and an upper fixing ring is provided on the outer wall of the suction pipe at a position corresponding to the lower fixing ring. The upper fixing ring and the lower fixing ring are flexibly connected by a wire, and the connection length is equal to the distance between the upper fixing ring and the lower fixing ring when the suction pipe is naturally vertical.

[0009] Optionally, the rocker arm connecting ring is a rocker arm extension connecting ring with an opening extending along the length of the rocker arm.

[0010] Optionally, an air vent is provided through the wall of the flared opening, and the air vent is located between the fixing ring below the flared opening and the suction pipe.

[0011] Optionally, the tank is provided with a transparent observation window, and a supplementary light is provided next to the observation window with an angle greater than 45° between the light emission angle and the observation window.

[0012] Optionally, when the extension allowances of the upper and lower telescopic sealing sleeves are equal, the length of the rocker arm inside the tank is less than or equal to the height inside the tank.

[0013] Optionally, the inner cavity of the tank has a flat bottom, with an inner wall length h1 of a flared opening, a length h2 of the suction pipe inside the tank, and a distance h3 from the center position of the suction pipe when it enters the tank to any side of the flat bottom, having the following length relationship: h1+h2≥h3; Furthermore, the length of the suction pipe inside the tank is equal to the height of the tank.

[0014] Optionally, the encapsulation cover has a suction tube sealing ring receiving groove at the center in the thickness direction, which surrounds the suction tube opening. The suction tube is fixedly connected to a suction tube sealing ring that surrounds the suction tube, and the suction tube sealing ring is coupled to the suction tube sealing ring receiving groove.

[0015] Optionally, the rocker arm is connected to a clamp, the inner ring of which forms a clearance fit with the outer wall of the suction pipe, and the connection between the rocker arm and the clamp is a ball joint hinge or welding.

[0016] The beneficial effects of the vacuum suction tube control device provided in this application are as follows: The vacuum suction pipe control device provided in this application controls the angle of a rigid rocker arm outside the tank, and then adjusts the position of the end of the suction pipe at the bottom of the tank based on the connection between the rocker arm connecting ring and the suction pipe connecting ring. This allows the suction pipe to attract materials outside the center position at the bottom of the tank, reducing the range of the "dead material zone" inside the tank and preventing materials from being stored for too long, which would affect its use. At the same time, due to the enhanced suction capacity, the cleaning cycle of the tank can be significantly reduced, improving production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a three-dimensional schematic diagram of the vacuum suction tube control device provided in the embodiments of this application; Figure 2 This is a front view schematic diagram of the vacuum suction tube control device provided in the embodiments of this application; Figure 3 yes Figure 2 CC section view; Figure 4 yes Figure 3 Enlarged view of point A; Figure 5 This is a side view schematic diagram of the vacuum suction tube control device provided in the embodiments of this application; Figure 6 yes Figure 5 BB section view; Figure 7 yes Figure 5 Enlarged view of point A; Figure 8 This is a three-dimensional schematic diagram of the first angle of the type A vacuum suction pipe provided in the embodiment of this application (with the tank hidden); Figure 9 yes Figure 8 Enlarged view of point A; Figure 10 This is a two-dimensional perspective view of the type A vacuum suction pipe provided in the embodiments of this application (hiding the tank body and sealing the tank lid); Figure 11 yes Figure 10 Enlarged view of point A; Figure 12 This is a three-dimensional schematic diagram of the type B vacuum suction tube provided in the embodiments of this application; Figure 13 yes Figure 12 Enlarged view of point A; Figure 14 This is a three-dimensional schematic diagram of the C-type vacuum suction tube provided in the embodiments of this application; Figure 15 yes Figure 14 Enlarged view of point A; Figure 16 This is a schematic diagram of the circular viewing window provided in an embodiment of this application; Figure 17 yes Figure 16 AA section view; Figure 18 This is a schematic diagram (partial view) of the hinged connection between the rocker arm and the ball joint of the clamp provided in the embodiment of this application. Figure 19 This is a partial view of the welding connection between the rocker arm and the clamp provided in the embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 1-Tank body; 2-Sealing cap; 3-Suction pipe; 4-Rock arm; 5-Support column; 6-Observation window; 7-Fixing bolt; 8-Upper telescopic sealing sleeve; 9-Lower telescopic sealing sleeve; 10-Suction pipe connecting ring; 11-Inner cavity of telescopic sealing sleeve; 12-Suction pipe inlet; 13-Suction pipe sealing ring receiving groove; 14-Suction pipe sealing ring; 15-Rock arm movable port; 16-Top surface of upper telescopic sealing sleeve; 17-Bottom surface of lower telescopic sealing sleeve; 18-Rock arm connecting ring; 19-Rock arm extension connecting ring; 20-Flare mouth; 21-Lower fixing ring of flare mouth; 22-Upper fixing ring of flare mouth; 23-Air vent; 24-Ball head female end; 25-Ball head female end; 26-Welding position; 27-Clamp; 28-Supplemental light. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] like Figures 1-5 as well as Figures 8-9As shown, this application provides a vacuum suction pipe control device, including a tank 11 and a sealing cover 2 for the sealed tank 11. The sealing cover 2 has a through-hole suction pipe port 12. One end of the suction pipe 3 is connected to a negative pressure source, and the other end passes through the suction pipe port 12 and enters the interior of the tank 11. A suction pipe connecting ring 10 is provided at the lower end of the suction pipe 3. A rocker arm movable port 15 is provided through the sealing cover 2. A rigid rocker arm 4 is provided in the rocker arm movable port 15. A rocker arm connecting ring 18 is provided at the lower end of the rigid rocker arm 4. The rocker arm connecting ring 18 is connected to the suction pipe connecting ring 10. An upper telescopic sealing sleeve 8 is fixedly connected to the rocker arm 4, covering the rocker arm movable port 15 from above. A lower telescopic sealing sleeve 9 is fixedly connected to the rocker arm, covering the rocker arm movable port 15 from below. The suction pipe 3 is a flexible hose, and the length of the suction pipe 3 inside the tank 11 is greater than the height inside the tank 11.

[0022] In this embodiment, the tank 1 is a spindle-shaped tank 1 with a flat cavity bottom. A support column 5 is provided at the bottom of the tank 1. The support column 5 supports the tank 1 so that the flat cavity bottom of the tank 1 is perpendicular to the direction of gravity. The tank 1 is filled with powder material. The lower end of the suction pipe 3 is inserted into the material at the bottom of the tank 1. The negative pressure source connected to the suction pipe 3 provides power for material transfer. The suction pipe 3 and the sealing cover 2 are sealed together, that is, there is no passage for material or gas to flow between the outer wall of the suction pipe 3 and the inner wall of the suction pipe opening 12, so as to prevent external impurities from entering the tank 1 and contaminating the material.

[0023] The sealing cap 2 is used to seal the opening at the top of the tank 1 by fixing bolts 7. A sealing ring is usually provided between the sealing cap 2 and the top of the tank 1. This application does not involve the improvement of the connection between the tank 1 and the sealing cap 2, nor does it involve the selection of the negative pressure source or the suction pipe 3. Those skilled in the art can select according to actual usage requirements.

[0024] like Figures 10-11 As shown, when the rocker arm 4 moves downward, the upper telescopic sealing sleeve 8 seals the rocker arm movable opening 15. When the rocker arm 4 moves upward, the lower telescopic sealing sleeve 9 seals the rocker arm movable opening 15. In the initial installation position of the rocker arm 4, both the upper telescopic sealing sleeve 8 and the lower telescopic sealing sleeve 9 are in a partially compressed state. Even if the rocker arm 4 is in any state, at least one of the upper telescopic sealing sleeve 8 and the lower telescopic sealing sleeve 9 is in a sealing state of the rocker arm movable opening 15.

[0025] The vacuum suction pipe control device provided in this application controls the angle of the rigid rocker arm 4 outside the tank body 1, and then adjusts the position of the end of the suction pipe 3 at the bottom of the tank body 1 based on the connection between the rocker arm connecting ring 18 and the suction pipe connecting ring 10. This allows the suction pipe 3 to attract materials outside the center position of the bottom of the tank body 1, reducing the range of the "dead material zone" inside the tank body 1 and preventing the material from being stored for too long and affecting its use. At the same time, due to the enhanced suction capacity, the cleaning cycle of the tank can be significantly reduced, and production efficiency can be improved.

[0026] As a feasible implementation, the connection relationship between the rocker arm connecting ring 18 and the suction pipe connecting ring 10 can be: 1. Direct connection, that is, the rocker arm connecting ring 18 and the suction pipe connecting ring 10 are directly sleeved together. In this scheme, since the rocker arm connecting ring 18 and the suction pipe connecting ring 10 are closest, this scheme can achieve the most sensitive effect of adjusting the position of the suction pipe 3 with the rocker arm 4; 2. Rigid connection, that is, there are connecting parts between the rocker arm connecting ring 18 and the suction pipe connecting ring 10 that are respectively connected to the rocker arm connecting ring 18 and the suction pipe connecting ring 10. Compared with scheme 1, this scheme has the following advantages: The sensitivity of the rocker arm 4 in adjusting the position of the suction tube 3 is slightly reduced. The closer the distance between the rocker arm connecting ring 18 and the suction tube connecting ring 10 after connection, the higher the sensitivity. Compared with Scheme 1, this scheme reduces the production and installation difficulty of the rocker arm 4 and the suction tube 3. 3. Flexible connection: The rocker arm connecting ring 18 and the suction tube connecting ring 10 are directly bolted together with wires. When the distance between the rocker arm connecting ring 18 and the suction tube connecting ring 10 after connection is close, this scheme can still achieve the effect of the rocker arm 4 sensitively adjusting the position of the suction tube 3, and also reduces the production and installation difficulty of the rocker arm 4 and the suction tube 3.

[0027] In another embodiment of this application, such as Figures 12-13 As shown, the lower end of the suction tube 3 has a flared opening. When the bottom of the suction tube 3 is tilted above the material surface, the negative pressure effect is weakened compared to the working mode where the bottom of the suction tube 3 is parallel to the material surface. Therefore, in this embodiment, a flared opening is added to the lower end of the suction tube 3. This allows the flared opening 20 on the side closer to the material to bend outward when the lower end of the suction tube 3 is tilted above the material surface, while the flared opening 20 on the side farther from the material covers the material to the maximum extent, thus ensuring the effectiveness of the negative pressure effect. The flared opening is made of a flexible material; as a feasible implementation, the flared opening is made of food-grade polypropylene.

[0028] In another embodiment of this application, such as Figures 12-13 As shown, a lower fixing ring 21 is evenly arranged around the outer wall of the flared opening. An upper fixing ring 22 is arranged on the outer wall of the suction pipe 3 at a position corresponding to the lower fixing ring 21. The upper fixing ring 22 and the lower fixing ring 21 are flexibly connected by a wire, and the connection length is equal to the distance between the upper fixing ring 22 and the lower fixing ring 21 when the suction pipe 3 is naturally perpendicular.

[0029] To prevent the flared opening 20 from folding inward and blocking the suction inlet of the suction pipe 3, the lower fixing ring 21 and the upper fixing ring 22 of the flared opening are flexibly connected by wire. The connection distance restricts the flared opening 20, so that it has no freedom to fold inward. The closer the upper fixing ring 22 and the lower fixing ring 21 of the flared opening are, the better the restriction effect.

[0030] In another embodiment of this application, such as Figures 12-13 As shown, the rocker arm connecting ring 18 is a rocker arm extension connecting ring 19 with an opening extending along the length of the rocker arm 4. When the tank 1 is sealed with material already inside, the rigid rocker arm 4, with its smaller diameter and rigidity, is easier to insert into the material than the suction pipe 3. However, the suction pipe 3, being made of a soft material, may encounter obstruction during material insertion. Compared to the rocker arm connecting ring 18 design mentioned above, this embodiment provides a rocker arm extension connecting ring 19 with greater vertical freedom of movement. When the suction pipe 3 is obstructed during material insertion, it coils and connects to the upper movable space of the rocker arm extension connecting ring 19 through the suction pipe connecting ring 10. As the material is gradually conveyed, the material level inside the tank 1 decreases, and the suction pipe 3 gradually straightens while maintaining its connection with the rocker arm extension connecting ring 19. During this process, the position of the rocker arm 4 can be completely adjusted.

[0031] In another embodiment of this application, such as Figures 14-15 As shown, an air vent 23 is provided through the wall of the flared opening, and the air vent 23 is located between the lower fixing ring 21 of the flared opening and the suction pipe 3. In this embodiment, four air vents 23 are provided, corresponding to the position of the lower fixing ring 21 of the flared opening and evenly distributed circumferentially. To prevent a single air inlet (feed inlet) from blocking the suction pipe 3, an air vent 23 is provided between the lower fixing ring 21 of the flared opening and the suction pipe 3. When one side of the air vent 23 is pressed and blocked due to the suction pipe 3 tilting and contacting the material, the air vent 23 opposite to it and the air vents 23 on both sides still serve to provide secondary air. Furthermore, when the tilt angle of the suction pipe 3 in contact with the material changes, the blocking material that may exist at the position of the air vent 23 can be removed from the position of the air vent 23 as the shape of the flared opening 20 changes.

[0032] In another embodiment of this application, such as Figure 16-17 As shown, the tank is equipped with a transparent observation window 6, and a supplementary light 28 is installed next to the observation window 6, with a light emission angle greater than 45° from the observation window. Controlling the emission angle of the supplementary light 28 can effectively prevent it from interfering with the observation of the tank's interior from the observation window 6. The power supply line of the supplementary light 28 passes through the tank 1 and is connected to an external power source, and the supplementary light 28 and its power supply line are kept sealed to the tank 1. When adjusting the position of the suction pipe 3 using the rocker arm 4, monitoring through the observation window 6 can more effectively complete the bottom material conveying.

[0033] As a viable alternative, such as Figures 1-2As shown, a transparent observation window 6 is provided on the side wall of the tank 1, but no supplementary lighting is provided. In this case, the lighting inside the tank 1 is provided by the outside light passing through the observation window 6. In this case, the observation window needs to be opened larger to ensure sufficient light.

[0034] In another embodiment of this application, when the extension allowances of the upper telescopic sealing sleeve 8 and the lower telescopic sealing sleeve 9 are equal, the length of the rocker arm 4 inside the tank 1 is less than or equal to the height inside the tank 1.

[0035] In another embodiment of this application, the inner cavity of the tank 1 has a flat bottom, an inner wall length h1 with a flared opening, a length h2 of the suction pipe 3 inside the tank 1, and a distance h3 from the center position of the suction pipe 3 when it enters the tank 1 to any edge of the flat bottom, having the following length relationship: h1+h2≥h3; Furthermore, the length of the suction pipe 3 inside the tank 1 is equal to the height inside the tank 1.

[0036] In order to ensure that the suction position of the suction pipe 3 can reach the entire bottom plane of the tank 1, the above condition needs to be met so that the suction pipe 3, in its fully extended state, can reach the position farthest from the center of the bottom plane of the tank 1 when combined with the flared mouth 20.

[0037] In this embodiment, the phrase "the length of the suction pipe 3 inside the tank 1 is equal to the height inside the tank 1" refers to a length that does not include the flared opening 20. That is, when the flared opening 20 is considered as part of the suction pipe 3, the length of the suction pipe 3 inside the tank 1 is greater than the height inside the tank 1; while excluding the flared opening 20 and only measuring the portion of the suction pipe 3 other than the flared opening 20, the length of the suction pipe 3 inside the tank 1 is equal to the height inside the tank 1.

[0038] In another embodiment of this application, such as Figures 6-7 As shown, the encapsulation cover 2 has a suction tube sealing ring receiving groove 13 that surrounds the suction tube opening 12 at the center in the thickness direction. The suction tube 3 is fixedly connected to a suction tube sealing ring 14 that surrounds the suction tube 3. The suction tube sealing ring 14 is coupled to the suction tube sealing ring receiving groove 13.

[0039] As a feasible sealing method, the suction tube sealing ring 14 coupled in the suction tube sealing ring receiving groove 13 restricts the vertical position of the suction tube 3 relative to the sealing cover 2, and the suction tube sealing ring 14 is naturally pressed against the bottom of the suction tube sealing ring receiving groove 13 by gravity under the action of the weight of the suction tube 3 to form a seal.

[0040] In another embodiment of this application, the rocker arm is connected to a clamp, the inner ring of the clamp and the outer wall of the suction pipe are in clearance fit, and the connection between the rocker arm and the clamp is a ball joint or welding.

[0041] like Figure 18 As shown, the rocker arm 4 is fixedly connected to a female ball end 25, and the clamp 27 is fixedly connected to a male ball end 24. The female ball end 25 and the male ball end 24 form a ball-head hinge. Therefore, in this embodiment, the rocker arm 4 can adjust its relative angle with the suction pipe 3 within the range of motion of the male ball end 24. Figure 19 The diagram shows the welding connection between the rocker arm and the clamp 27. It can be seen that since the rocker arm 4 and the clamp 27 have a fixed welding position 26, the relative angle between the rocker arm 4 and the end of the suction pipe 3 is fixed.

[0042] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A vacuum suction pipe control device, comprising a tank body and a sealing cap for the tank body, wherein the sealing cap has a through-hole for the suction pipe, characterized in that: One end of the suction pipe is connected to a negative pressure source, and the other end passes through the suction pipe inlet into the tank. A suction pipe connecting ring is provided at the lower end of the suction pipe. The sealing cover has a through-hole for a rocker arm movable opening. A rigid rocker arm is provided inside the rocker arm movable opening. A rocker arm connecting ring is provided at the lower end of the rocker arm. The rocker arm connecting ring is connected to the suction pipe connecting ring. An upper telescopic sealing sleeve is fixedly connected to the rocker arm, covering the rocker arm movable opening from above. A lower telescopic sealing sleeve is fixedly connected to the rocker arm, covering the rocker arm movable opening from below. The suction pipe is a flexible tube, and the length of the suction pipe inside the tank is greater than the height of the tank.

2. The vacuum suction tube control device as described in claim 1, characterized in that: The lower end of the suction tube has a funnel-shaped opening.

3. The vacuum suction tube control device as described in claim 2, characterized in that: The outer wall of the flared opening is uniformly provided with a lower fixing ring, and the suction tube is provided with an upper fixing ring on its outer wall at a position corresponding to the lower fixing ring. The upper fixing ring and the lower fixing ring are flexibly connected by a wire, and the connection length is equal to the distance between the upper fixing ring and the lower fixing ring when the suction tube is naturally vertical.

4. The vacuum suction tube control device as described in claim 1, characterized in that: The rocker arm connecting ring is a rocker arm extension connecting ring with an opening extending along the length direction of the rocker arm.

5. The vacuum suction tube control device as described in claim 2, characterized in that: An air vent is provided through the wall of the horn-shaped opening, and the air vent is located between the fixing ring below the horn opening and the suction pipe.

6. The vacuum suction tube control device as described in claim 1, characterized in that: The tank is equipped with a transparent observation window, and a supplementary light is installed next to the observation window, with the angle between the light emission angle and the observation window being greater than 45°.

7. The vacuum suction tube control device as described in claim 1, characterized in that: When the extension allowances of the upper and lower telescopic sealing sleeves are equal, the length of the rocker arm inside the tank is less than or equal to the height inside the tank.

8. The vacuum suction tube control device as described in claim 2, characterized in that: The inner cavity of the tank has a flat bottom. With the inner wall length h1 of the flared opening, the length h2 of the suction pipe inside the tank, and the distance h3 from the center position of the suction pipe when it enters the tank to any side of the flat bottom, the following length relationship exists: h1+h2≥h3; Furthermore, the length of the suction pipe inside the tank is equal to the height of the tank.

9. The vacuum suction tube control device as described in claim 1, characterized in that: The encapsulation cover has a suction tube sealing ring receiving groove at the center in the thickness direction, which surrounds the suction tube opening. The suction tube is fixedly connected to a suction tube sealing ring that surrounds the suction tube, and the suction tube sealing ring is coupled to the suction tube sealing ring receiving groove.

10. The vacuum suction tube control device as described in claim 1, characterized in that: The rocker arm is connected to a clamp, and the inner ring of the clamp forms a clearance fit with the outer wall of the suction pipe. The connection between the rocker arm and the clamp is either a ball joint or a weld.

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