A cover body applied to open container feeding
By designing a multi-layered sleeve structure for the cover, the problem of VOCs volatilization in the automatic batching station for automotive paint additives was solved. This achieved applicability and airtightness to containers of different sizes, reduced VOCs escape, and improved the cleanliness of the production environment and operational safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NIPPON AUTOMOBILE COATINGS (TIANJIN) CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-06-19
AI Technical Summary
Existing automatic batching stations for automotive paint additives pose problems such as VOC emissions during material feeding, leading to environmental pollution and health risks to operators. Furthermore, existing ventilation equipment cannot meet the needs of containers of different sizes.
A multi-layer sleeve structure cover was designed, including a first sleeve, a second sleeve and an intermediate sleeve. It can be extended and lifted by a lifting rail assembly to adapt to the height requirements of containers of different sizes. The sealing ring and locking bolts ensure airtightness and prevent VOCs from escaping by combining a micro negative pressure environment.
It achieves applicability to containers of different sizes, forms a closed space, reduces VOCs volatilization, improves the cleanliness of the production environment, and creates healthy operating conditions.
Smart Images
Figure CN224376616U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of material feeding equipment in automotive paint shops. More specifically, it relates to a cover for feeding open containers. Background Technology
[0002] When the automatic batching station for automotive paint additives feeds materials into open containers such as cylinders or material drums, a large amount of VOCs are released into the atmosphere, causing environmental pollution, strong odors, and health risks to employees. Current solutions include: one is to house the entire automatic batching station in a sealed room, trapping the VOCs within, and then using strong ventilation to remove them, creating a slightly negative pressure space to prevent escape; the other is to install ventilation hoods or fixed ventilation cylinder covers around the feeding port, using powerful ventilation to remove the released VOCs. The first solution requires a sealed room, which is large, costly to construct, and still requires personnel to enter the room, failing to address the issue of operator contamination. The second solution uses fixed ventilation hoods or cylinder covers, which cannot simultaneously accommodate the open diameters and heights of containers of different sizes, and cannot achieve a sealed or slightly negative pressure space. Utility Model Content
[0003] In view of the above problems, one objective of this utility model is to provide a cover that can be used for feeding materials into containers of different sizes and meets environmental protection requirements.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A cover for use in dispensing materials from open containers, comprising:
[0006] Multiple sleeves nested together, and a hanging rail assembly;
[0007] The multi-layer sleeve is arranged sequentially from the innermost layer to the outermost layer, including at least a first sleeve located in the innermost layer and a second sleeve located in the outermost layer;
[0008] The first sleeve is a hollow cylindrical structure, and its end away from the second sleeve is fixed to the feeding port. The second sleeve is connected to the hanging rail assembly and can move relative to the first sleeve along the axial direction of the first sleeve under the action of the hanging rail assembly.
[0009] The second sleeve includes a telescopic part with a hollow cylindrical structure, and a cover part formed by extending outward in a circumferential direction from one end of the telescopic part away from the feeding port, the cover part being used to close the open container;
[0010] The inner diameter of the telescopic part is greater than the outer diameter of the first sleeve, and the diameter of the cover is greater than the outer diameter of the telescopic part.
[0011] Alternatively, the sleeve may further include at least one intermediate sleeve located between the first sleeve and the second sleeve.
[0012] The intermediate sleeve is a hollow cylindrical structure with an inner diameter larger than the outer diameter of the first sleeve. The outer diameter of the intermediate sleeve is smaller than the inner diameter of the telescopic part. The second sleeve can telescopically extend and retract relative to the intermediate sleeve and the first sleeve. The intermediate sleeve can telescopically extend and retract relative to the first sleeve.
[0013] Alternatively, a first limiting ring is provided at the end of the first sleeve away from the feeding port, and the first limiting ring is arranged around the outer peripheral surface of the first sleeve.
[0014] The end of the intermediate layer sleeve near the feeding port includes a first retaining ring formed by the inner wall of the intermediate layer sleeve protruding radially into the intermediate layer sleeve. When the intermediate layer sleeve moves to the first limit position, the first limiting ring abuts against the first retaining ring to prevent the intermediate layer sleeve from coming out from below the first sleeve.
[0015] Alternatively, a second limiting ring is provided at the end of the intermediate layer sleeve away from the feeding port, and the second limiting ring is arranged around the outer peripheral surface of the intermediate layer sleeve.
[0016] The end of the telescopic part away from the cover includes a second retaining ring formed by the inner wall of the telescopic part protruding radially into the telescopic part along the second sleeve. When the second sleeve moves to the second limit position, the second limiting ring abuts against the second retaining ring to prevent the second sleeve from coming out from below the middle layer sleeve.
[0017] Alternatively, a first locking bolt is fixed to the outer circumferential surface of the connection end between the first sleeve and the feeding port, and the projection of the first locking bolt in the plane perpendicular to the axis of the first sleeve exceeds the edge of the projection of the intermediate layer sleeve in that plane.
[0018] When the intermediate sleeve moves to the third limit position, the first locking bolt and the upper end face of the intermediate sleeve abut against each other to avoid collision between the intermediate sleeve and the feeding equipment.
[0019] Alternatively, a second locking bolt is fixed to the outer circumferential surface of the middle layer sleeve near the feeding port, and the projection of the second locking bolt in the plane perpendicular to the axis of the first sleeve exceeds the edge of the projection of the telescopic part in that plane.
[0020] When the second sleeve moves to the fourth limit position, the second locking bolt and the upper end face of the telescopic part abut against each other, so that the intermediate layer sleeve can move along the axial direction of the first sleeve under the drive of the second sleeve to perform telescopic movement.
[0021] Alternatively, a first sealing ring may be provided between the first sleeve and the intermediate sleeve. The first sealing ring is annular and is fixed to the first retaining ring. The inner circumferential surface of the first sealing ring is in close contact with the outer circumferential surface of the first sleeve, and the outer circumferential surface of the first sealing ring is in close contact with the inner circumferential surface of the intermediate sleeve.
[0022] Alternatively, a second sealing ring may be provided between the intermediate sleeve and the telescopic part. The second sealing ring is annular and is fixed to the second retaining ring. The inner circumferential surface of the second sealing ring is in close contact with the outer circumferential surface of the intermediate sleeve, and the outer circumferential surface of the second sealing ring is in close contact with the inner circumferential surface of the telescopic part.
[0023] Alternatively, the surface of the cover away from the feeding port can be a sealing surface that fits with the open container, and this sealing surface is covered with a silicone sheet.
[0024] Alternatively, the suspension rail assembly may include a hand crank, a wire rope, a pulley block, and lifting rings.
[0025] The number of lifting rings is three, which are evenly distributed on the side surface of the cover near the feeding port and are fixed to the cover.
[0026] One end of the wire rope is connected to the lifting ring, and the other end is connected to the hand crank via a pulley system. By rotating the hand crank, the lifting and lowering of the second sleeve along the axial direction of the first sleeve can be controlled.
[0027] The beneficial effects of this utility model are as follows:
[0028] To address the technical problems existing in the prior art, this utility model provides a cover for dispensing materials into open containers. Through a telescopic structure design, the cover can accommodate the height requirements of containers of different sizes during dispensing. The enlarged cover can cover open containers of various sizes from 30L to 1000L currently used in production, avoiding the inconvenience of requiring a separate cover for each container size. Simultaneously, it creates a sealed space and provides a slightly negative pressure environment to prevent VOCs escape. Furthermore, the entire cover is located within the operating space below the dispensing port, requiring no additional floor space. The cover provided by this application, through lower cost, results in lower or even zero VOCs volatilization when the automatic additive dispensing station dispenses materials into open containers, improving the cleanliness of the production environment and creating a healthier production process for employees. Attached Figure Description
[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0030] Figure 1 This is one of the structural schematic diagrams of the cover provided in an embodiment of the present invention.
[0031] Figure 2The second schematic diagram shows the structure of the cover provided in this embodiment of the present invention.
[0032] Figure 3 This diagram illustrates the movement of the second sleeve to the fourth limit position according to an embodiment of the present invention.
[0033] Figure 4 This diagram illustrates the movement of the intermediate sleeve to the third extreme position according to an embodiment of the present invention.
[0034] Figure 5 This is a top view of the cover provided in an embodiment of the present invention. Detailed Implementation
[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] In this invention, unless otherwise expressly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not being in direct contact but through another feature between them.
[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0039] To address the shortcomings of existing technologies, this utility model provides a cover for discharging materials from open containers, combined with... Figure 1-5 As shown, the cover includes multiple layers of sleeves nested together and a hanging rail assembly.
[0040] The multi-layer sleeves are arranged sequentially from the innermost layer to the outermost layer, including at least the first sleeve 1 located in the innermost layer and the second sleeve 2 located in the outermost layer.
[0041] The first sleeve 1 is a stainless steel tubular fitting with a hollow cylindrical structure. The end of the first sleeve 1 furthest from the second sleeve 2 is fixedly connected to the feeding port 100. The second sleeve 2 is connected to the hanging rail assembly and can move relative to the first sleeve 1 along its axial direction under the action of the hanging rail assembly. For ease of description, the axial direction of the first sleeve 1 is referred to as the first direction, i.e. Figure 1 The vertical direction in the middle.
[0042] The second sleeve 2 includes a telescopic part 21 with a hollow cylindrical structure, and a cover part 22 formed by extending outward in a circumferential direction from one end of the telescopic part 21 away from the feeding port 100. The cover part 22 is used to close the open container 200.
[0043] The inner diameter of the telescopic part 21 is larger than the outer diameter of the first sleeve 1, and the diameter of the cover part 22 is larger than the outer diameter of the telescopic part 21.
[0044] In one specific embodiment, the sleeve further includes at least one intermediate sleeve 3 located between the first sleeve 1 and the second sleeve 2. The intermediate sleeve 3 is a stainless steel tubular fitting with a hollow cylindrical structure. The inner diameter of the intermediate sleeve 3 is larger than the outer diameter of the first sleeve 1, and the outer diameter of the intermediate sleeve 3 is smaller than the inner diameter of the telescopic part 21. The second sleeve 2 is telescopic relative to the intermediate sleeve 3 and the first sleeve 1, and the intermediate sleeve 3 is telescopic relative to the first sleeve 1.
[0045] In one embodiment, such as Figure 1 As shown, there is one intermediate sleeve 3. The intermediate sleeve 3 is sleeved on the outside of the first sleeve 1, and the second sleeve 2 is sleeved on the outside of the intermediate sleeve 3.
[0046] In another embodiment, such as Figure 2 As shown, there are three intermediate sleeves 3. The inner diameter of the intermediate sleeves 3 increases sequentially from the side closest to the first sleeve 1 to the side closest to the second sleeve 2. The outer diameter of the previous intermediate sleeve 3 is smaller than the inner diameter of the next intermediate sleeve 3. The inner diameter of the intermediate sleeve 3 at the top is larger than the outer diameter of the first sleeve 1, and the outer diameter of the intermediate sleeve 3 at the bottom is smaller than the inner diameter of the telescopic part 21.
[0047] The number of intermediate layer sleeves 3 is not limited to 1 or 3. The above two embodiments are only illustrative examples. In actual production, the number of intermediate layer sleeves 3 should be specifically designed according to the height of the open container 200, the height range between the open container 200 and the feeding port 100, and site limitations.
[0048] In one specific embodiment, a clamp 4 is provided on the inner side of the top of the first sleeve 1. The clamp 4 is fixedly connected to the feeding port 100, so that the material discharged from the feeding port 100 can enter the first sleeve 1, and then enter the open container 200 through the intermediate sleeve 3 and the second sleeve 1.
[0049] In this embodiment, as Figure 1 As shown, the intermediate sleeve 3 is in the first extreme position, and the second sleeve 2 is in the second extreme position. In this state, the cover is at its maximum length under this structure, suitable for feeding materials into containers with lower heights. Figure 3 As shown, the second sleeve 2 is in the fourth extreme position. The second sleeve 2 moves between the second extreme position and the fourth extreme position. After reaching the fourth extreme position, the upward movement of the second sleeve 2 will push the intermediate layer sleeve 3 to move together. Figure 4 As shown, the intermediate sleeve 3 is in the third extreme position. The intermediate sleeve 3 moves between the first extreme position and the third extreme position. After reaching the third extreme position, the intermediate sleeve 3 will not be able to move upward. In this state, the cover is at the minimum length under this structure, which is suitable for feeding materials into containers with higher heights.
[0050] In one specific embodiment, a first limiting ring 51 is provided at the end of the first sleeve 1 away from the feeding port 100, and the first limiting ring 51 is arranged around the outer peripheral surface of the first sleeve 1.
[0051] The end of the intermediate sleeve 3 near the feed port 100 includes a first retaining ring 61 formed by a radial protrusion of the inner wall of the intermediate sleeve 3 into the interior of the intermediate sleeve 3. The intermediate sleeve 3 can move between a first limit position and a third limit position to adjust the overall height of the cover. Figure 1 As shown, when the intermediate sleeve 3 moves to the first limit position, the upper end face of the first limiting ring 51 abuts against the lower end face of the first retaining ring 61 to prevent the intermediate sleeve 3 from coming off from below the first sleeve 1, so as to ensure the effective connection between the first sleeve 1 and the intermediate sleeve 3 and prevent the entire cover from falling off.
[0052] In this embodiment, a first sealing ring 71 is disposed between the first sleeve 1 and the intermediate sleeve 3. The first sealing ring 71 is annular and made of bristle material. The first sealing ring 71 is fitted and fixed to the upper end face of the first retaining ring 61. The inner circumferential surface of the first sealing ring 71 is in close contact with the outer circumferential surface of the first sleeve 1, and the outer circumferential surface of the first sealing ring 71 is in close contact with the inner circumferential surface of the intermediate sleeve 3. This satisfies the requirement that the intermediate sleeve 3 can extend and retract relative to the first sleeve 1 while ensuring a tight seal between the first sleeve 1 and the intermediate sleeve 3.
[0053] In one specific embodiment, a second limiting ring 52 is provided at the end of the intermediate layer sleeve 3 away from the feeding port 100, and the second limiting ring 52 is arranged around the outer peripheral surface of the intermediate layer sleeve 3.
[0054] The end of the telescopic part 21 away from the cover part 22 includes a second retaining ring 62 formed by the inner wall of the telescopic part 21 protruding radially into the telescopic part 21 along the second sleeve 2. The second sleeve 2 is capable of moving between a second limit position and a fourth limit position under the action of the hanging rail assembly to adjust the overall height of the cover. Figure 1 As shown, when the second sleeve 2 moves to the second limit position, the upper end face of the second limiting ring 52 and the lower end face of the second retaining ring 62 abut against each other to prevent the second sleeve 2 from coming off from below the intermediate layer sleeve 3, so as to ensure the effective connection between the intermediate layer sleeve 3 and the second sleeve 2 and prevent the entire cover from falling off.
[0055] In this embodiment, a second sealing ring 72 is disposed between the intermediate sleeve 3 and the telescopic part 21. The second sealing ring 72 is annular and made of bristle material. The second sealing ring 72 is fitted and fixed to the upper end face of the second retaining ring 62. The inner circumferential surface of the second sealing ring 72 is in close contact with the outer circumferential surface of the intermediate sleeve 3, and the outer circumferential surface of the second sealing ring 72 is in close contact with the inner circumferential surface of the telescopic part 21. This satisfies the requirement that the second sleeve 2 can extend and retract relative to the intermediate sleeve 3 while ensuring a tight seal between the second sleeve 2 and the intermediate sleeve 3.
[0056] In one specific embodiment, a first locking bolt 81 is fixed to the outer peripheral surface of the connection end between the first sleeve 1 and the feeding port 100. The projection of the first locking bolt 81 in the plane perpendicular to the first direction extends beyond the edge of the projection of the intermediate sleeve 3 in that plane. Figure 4 As shown, when the intermediate sleeve 3 moves to the third limit position, the first locking bolt 81 and the upper end face of the intermediate sleeve 3 abut against each other to prevent the intermediate sleeve 3 from moving too high and colliding with the feeding equipment.
[0057] In this embodiment, the first sleeve 1 is provided with at least two first locking bolts 81, and the two first locking bolts 81 are symmetrically distributed with respect to the axis of the first sleeve 1.
[0058] In one specific embodiment, a second locking bolt 82 is fixed to the outer peripheral surface of the end of the intermediate sleeve 3 near the feeding port 100. The projection of the second locking bolt 82 in the plane perpendicular to the first direction exceeds the edge of the projection of the telescopic part 21 in that plane. Figure 3 As shown, when the second sleeve 2 moves to the fourth limit position, the upper end face of the second locking bolt 81 and the telescopic part 21 abuts, and the second sleeve 2 continues to move upward through the hanging rail assembly, so that the intermediate layer sleeve 3 can move upward synchronously under the push of the second sleeve 2, and telescopic relative to the first sleeve 1.
[0059] In this embodiment, the intermediate sleeve 3 is provided with at least two second locking bolts 82, and the two second locking bolts 82 are symmetrically distributed with respect to the axis of the intermediate sleeve 3.
[0060] In one specific embodiment, the surface of the cover 22 away from the feeding port 100 is a sealing surface that closes to the open container 200, and this sealing surface is covered with a silicone plate 221. The silicone plate 221 is annular and can avoid the portion corresponding to the telescopic part 21, allowing material to smoothly enter the open container 200. In this embodiment, the silicone plate 221 is made of soft silicone. The overall height of the cover is adjusted by the hanging rail assembly so that the cover 22 closes to the open container 200. Utilizing the weight of the cover itself and the flexibility of the soft silicone, the cover can be pressed tightly against the open edge of the open container to form a sealed space inside the open container.
[0061] Furthermore, a vent 222 can be provided in the cover 22, and the vent can be connected to an exhaust duct to create a slightly negative pressure environment in the enclosed space to prevent VOCs from escaping.
[0062] In one specific embodiment, the lifting rail assembly includes a hand crank 91, a steel wire rope 92, a pulley block 93, and lifting rings 94. Three lifting rings 94 are evenly distributed on the surface of the cover 22 near the feeding port 100 and are fixedly attached to the cover 22. One end of the steel wire rope 92 is connected to the lifting ring 94, and the other end is connected to the hand crank 91 via the pulley block 93. By rotating the hand crank 91, the tightening and loosening of the steel wire rope 92 can be controlled, allowing the cover to freely rise and fall to adjust its height to accommodate feeding from open containers 200 of different heights. Furthermore, since the lifting is performed using the lifting rail assembly, the weighing of the material is not affected.
[0063] In one specific embodiment, the first sleeve 1 has a size of φ260mm*280mm, the intermediate layer sleeve 3 has a size of φ380mm*280mm, the telescopic part 21 has a size of φ500mm*200mm, and the cover 22 has a diameter of 1250mm. It can cover the open mouths of containers of different specifications from 30L to 1000L currently used in production, avoiding the trouble of needing a cover for each specification of container. At the same time, it can form a sealed space and provide a micro-negative pressure environment to prevent VOCs from escaping.
[0064] Furthermore, the edge of the cover 22 includes a downward folded edge 223, the height of which along the first direction is 80 mm.
[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.
Claims
1. A cover for use in open container feeding, characterized in that, include: Multiple sleeves nested together, and a hanging rail assembly; The multi-layer sleeve is arranged sequentially from the innermost layer to the outermost layer, including at least a first sleeve located in the innermost layer and a second sleeve located in the outermost layer; The first sleeve is a hollow cylindrical structure, and its end away from the second sleeve is fixed to the feeding port. The second sleeve is connected to the hanging rail assembly and can move relative to the first sleeve along the axial direction of the first sleeve under the action of the hanging rail assembly. The second sleeve includes a telescopic part with a hollow cylindrical structure, and a cover part formed by extending outward in a circumferential direction from one end of the telescopic part away from the feeding port, the cover part being used to close the open container; The inner diameter of the telescopic part is greater than the outer diameter of the first sleeve, and the diameter of the cover is greater than the outer diameter of the telescopic part.
2. The lid for use in open container dosing according to claim 1, characterized in that The sleeve further includes at least one intermediate sleeve located between the first sleeve and the second sleeve; The intermediate sleeve is a hollow cylindrical structure with an inner diameter larger than the outer diameter of the first sleeve. The outer diameter of the intermediate sleeve is smaller than the inner diameter of the telescopic part. The second sleeve can telescopically extend and retract relative to the intermediate sleeve and the first sleeve. The intermediate sleeve can telescopically extend and retract relative to the first sleeve.
3. The lid for use in open container dosing according to claim 2, characterized in that A first limiting ring is provided at the end of the first sleeve away from the feeding port, and the first limiting ring is arranged around the outer peripheral surface of the first sleeve; The end of the intermediate layer sleeve near the feeding port includes a first retaining ring formed by the inner wall of the intermediate layer sleeve protruding radially into the intermediate layer sleeve. When the intermediate layer sleeve moves to the first limit position, the first limiting ring abuts against the first retaining ring to prevent the intermediate layer sleeve from coming out from below the first sleeve.
4. The lid for use in open container dosing according to claim 2, wherein A second limiting ring is provided at the end of the intermediate layer sleeve away from the feeding port, and the second limiting ring is arranged around the outer peripheral surface of the intermediate layer sleeve; The end of the telescopic part away from the cover includes a second retaining ring formed by the inner wall of the telescopic part protruding radially into the telescopic part along the second sleeve. When the second sleeve moves to the second limit position, the second limiting ring abuts against the second retaining ring to prevent the second sleeve from coming out from below the middle layer sleeve.
5. The cover for feeding open containers according to claim 2, characterized in that, A first locking bolt is fixed to the outer circumferential surface of the connection end between the first sleeve and the feeding port. The projection of the first locking bolt in the plane perpendicular to the axis of the first sleeve exceeds the edge of the projection of the intermediate layer sleeve in that plane. When the intermediate sleeve moves to the third limit position, the first locking bolt and the upper end face of the intermediate sleeve abut against each other to avoid collision between the intermediate sleeve and the feeding equipment.
6. The cover for feeding open containers according to claim 2, characterized in that, The outer circumferential surface of the intermediate layer sleeve near the feeding port is fixed with a second locking bolt. The projection of the second locking bolt in the plane perpendicular to the axis of the first sleeve exceeds the edge of the projection of the telescopic part in that plane. When the second sleeve moves to the fourth limit position, the second locking bolt and the upper end face of the telescopic part abut against each other, so that the intermediate layer sleeve can move along the axial direction of the first sleeve under the drive of the second sleeve to perform telescopic movement.
7. The cover for feeding open containers according to claim 3, characterized in that, A first sealing ring is disposed between the first sleeve and the intermediate layer sleeve. The first sealing ring is annular and is fixed to the first retaining ring. The inner circumferential surface of the first sealing ring is in close contact with the outer circumferential surface of the first sleeve, and the outer circumferential surface of the first sealing ring is in close contact with the inner circumferential surface of the intermediate layer sleeve.
8. The cover for feeding open containers according to claim 4, characterized in that, A second sealing ring is disposed between the intermediate sleeve and the telescopic part. The second sealing ring is annular and is fixed to the second retaining ring. The inner circumferential surface of the second sealing ring is in close contact with the outer circumferential surface of the intermediate sleeve, and the outer circumferential surface of the second sealing ring is in close contact with the inner circumferential surface of the telescopic part.
9. The cover for feeding open containers according to claim 1, characterized in that, The surface of the cover away from the feeding port is a sealing surface that fits with the open container, and this sealing surface is covered with a silicone plate.
10. The cover for feeding open containers according to claim 1, characterized in that, The suspension rail assembly includes a hand crank, wire rope, pulley block, and lifting rings; The number of lifting rings is three, which are evenly distributed on the side surface of the cover near the feeding port and are fixed to the cover. One end of the wire rope is connected to the lifting ring, and the other end is connected to the hand crank via a pulley system. By rotating the hand crank, the lifting and lowering of the second sleeve along the axial direction of the first sleeve can be controlled.