Leakage-proof discharging mechanism and valve port packaging machine

Abstract

The utility model discloses a leakproof discharge mechanism and valve port packing machine, leakproof discharge mechanism includes: discharge pipe body, sealing part and pressing bag part, sealing part includes sealing piece and connecting piece, the sealing piece is movably arranged in the discharge port of discharge pipe body, has the closing position of sealing discharge port and has the opening position of opening discharge port, and the connecting piece is connected with the sealing piece. The connecting piece is arranged on one side of the discharging pipe body and is fixedly connected with the sealing piece; a retractable or expandable clamping area is formed between the bag pressing component and the connecting piece, when the driving end drives the clamping area to retract, the sealing piece is driven to be switched from the closed position to the open position, and when the driving end drives the clamping area to expand, the sealing piece is driven to be switched from the open position to the closed position; according to the device, the flowing path of residual materials in the discharging pipe can be effectively blocked when a packaging bag is drawn out, and the problem of leakage during pipe drawing of a traditional discharging mechanism is solved, so that waste of the materials and pollution to the environment are avoided, and the discharging efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of valve-mouth packaging machine technology, specifically to a leak-proof dispensing mechanism and a valve-mouth packaging machine. Background Technology

[0002] The valve-type dry mortar packaging machine uses microcomputer metering to achieve automatic packaging, automatic metering, automatic closing, and automatic zeroing. When the set value is reached, the equipment will automatically drop the bag to complete the packaging process. It is suitable for packaging various dry mortars, including cement, putty powder, gypsum powder, talc powder, etc.

[0003] For example, CN103496454A discloses a fully automatic valve bag packaging machine, including a frame, a feeding device, a conveying device, and a filling device arranged sequentially on the frame and connected internally along the packaging process direction, and a pressing device and a bag pushing device fixed on the frame, respectively located directly above and below the filling device. During discharging, the pressing device presses down to press the bag against the top of the discharging pipe, thus fixing the position of the bag.

[0004] However, when the discharge pipe is pulled out of the packaging bag after filling, the material remaining on the pipe wall will spill out uncontrollably, causing pollution to the working environment and wasting valuable materials. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a leak-proof material discharge mechanism and valve-type packaging machine to solve the technical problem of material leakage when the discharge pipe is pulled out of the packaging bag after filling in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a leak-proof discharge mechanism, comprising: a discharge pipe body, a sealing component, and a bag-pressing component. The sealing component includes a sealing element and a connecting element. The sealing element is movably disposed at the discharge port of the discharge pipe body, having a closed position for sealing the discharge port and an open position for opening the discharge port. The connecting element is disposed on one side of the discharge pipe body and is fixedly connected to the sealing element. The driving end of the bag-pressing component is connected to the connecting element, and a retractable or expandable clamping area is formed between the driving end and the connecting element. When the driving end drives the clamping area to retract, it drives the sealing element to switch from the closed position to the open position. When the driving end drives the clamping area to expand, it drives the sealing element to switch from the open position to the closed position.

[0008] In some embodiments, one side of the seal is rotatably connected to one side of the discharge tube, one end of the connector is fixedly connected to the seal, and the other end is connected to the first part of the driving end of the bag pressing component, and the clamping area is formed between the side of the connector facing away from the discharge tube and the driving end.

[0009] In some embodiments, the clamping surface of the connector corresponding to the clamping area is a non-flat surface, and when the clamping area contracts, the driving end of the bag pressing component matches the clamping surface of the connector.

[0010] In some embodiments, the bag-pressing component includes a bag-pressing member and a bag-pressing drive member. One end of the bag-pressing member has a connecting portion and a bag-pressing portion. The connecting portion is connected to the connecting member, and the bag-pressing portion is located on the side of the connecting portion near the sealing member, forming the clamping area between it and the connecting member. The bag-pressing drive member is fixedly installed on the outside of the discharge pipe body, and its output end is connected to the other end of the bag-pressing member for driving the bag-pressing member to move relative to the connecting member, so as to drive the clamping area to contract or expand.

[0011] In some embodiments, a groove is provided at the connecting part of the bag-pressing component, and sliding members are provided on both sides of one end of the connecting component. The sliding members can slide back and forth along the groove and can rotate around their own axis within the groove.

[0012] In some embodiments, the bag-pressing component and the bag-pressing drive component are detachably connected by a connecting structure.

[0013] In some embodiments, the connection structure includes a threaded sleeve and a threaded rod connected to the bag-pressing drive member. The threaded rod passes through the threaded sleeve and is threadedly engaged with the threaded sleeve. The bag-pressing member is disposed at the end of the threaded sleeve away from the bag-pressing drive member.

[0014] In some embodiments, the bag-pressing drive includes a cylinder, a hydraulic cylinder, or an electric push rod.

[0015] In some embodiments, when the seal is in the closed position, the angle between the connector and the central axis of the discharge pipe is 30°-60°, and the opening angle of the seal relative to the discharge pipe is 30° to 60°.

[0016] Secondly, this utility model also provides a valve-type packaging machine, including a leak-proof discharging mechanism as described in any of the above claims.

[0017] Compared with existing technologies, the leak-proof discharge mechanism and valve-type packaging machine provided by this utility model, through the setting of a discharge pipe, a sealing component, and a bag-pressing component, ensures that when the packaging bag is in place, the bag-pressing component clamps the bag while simultaneously switching the sealing component to the open position, ensuring unobstructed discharge channel. After discharge is completed, the mechanism automatically drives the sealing component to the closed position the instant the packaging bag is released, effectively blocking the flow path of residual material in the discharge pipe. This device only uses a mechanical linkage method and can achieve coordinated control of sealing and bag clamping. It can ensure precise coordination of actions without the need for a complex sensing system. This linkage design achieves full-process sealed control of the discharge process, solving the dripping problem of traditional discharge mechanisms during pipe pulling, thereby avoiding material waste and environmental pollution, and improving discharge efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the leak-proof discharge mechanism provided in this embodiment when the sealing element is in the closed position;

[0019] Figure 2 This is a schematic diagram of the overall structure of the leak-proof discharge mechanism provided in this embodiment of the present invention when the sealing element is in the open position;

[0020] Figure 3 This is a three-dimensional structural diagram of the connection between the sealing component and the discharge pipe body of the leak-proof discharge mechanism provided in this embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the connection between the sealing component and the discharge pipe body of the leak-proof discharge mechanism provided in this embodiment of the utility model;

[0022] Figure 5 yes Figure 2 Enlarged view of point A in the middle;

[0023] Figure 6 This is a schematic diagram of the overall structure of the leak-proof discharge mechanism and valve-type packaging machine provided in this embodiment of the utility model;

[0024] Figure 7 yes Figure 6 Enlarged view of section B in the middle.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Discharge pipe body; 11. Rotating support; 2. Sealing component; 21. Sealing element; 211. Connecting frame; 212. Sealing cover; 22. Connecting element; 221. Connecting plate; 222. Clamping surface; 223. Sliding element; 3. Bag pressing component; 31. Bag pressing component; 311. Bag pressing block; 312. Slide groove; 32. Bag pressing drive component; 33. Connecting structure; 331. Threaded sleeve; 332. Threaded rod; 4. Packaging machine body. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] To address the technical problem of material leakage when the packaging bag is pulled out of the discharge pipe after filling, this utility model provides a leak-proof discharge mechanism and valve-type packaging machine. When the packaging bag is pulled out, the sealing component can effectively block the flow path of residual material in the discharge pipe, solving the dripping problem of traditional discharge mechanisms when pulling out the pipe, thereby avoiding material waste and environmental pollution, and improving discharge efficiency.

[0029] It should be noted that the anti-leakage discharge mechanism described in this utility model is used in, but not limited to, valve-mouth packaging machines. For ease of explanation, this utility model only uses the application of the anti-leakage discharge mechanism in a valve-mouth packaging machine as an example. The principle of the anti-leakage discharge mechanism in other types of equipment is essentially the same as that in the valve-mouth packaging machine, and will not be described in detail here.

[0030] Please see Figure 1 and Figure 2 In a first aspect, embodiments of this application provide a leak-proof discharge mechanism, including: a discharge pipe body 1, a sealing component 2, and a bag-pressing component 3. The sealing component 2 includes a sealing element 21 and a connecting element 22. The sealing element 21 is movably disposed at the discharge port of the discharge pipe body, having a closed position for sealing the discharge port and an open position for opening the discharge port. The connecting element 22 is disposed on one side of the discharge pipe body 1 and is fixedly connected to the sealing element 21. The driving end of the bag-pressing component 3 is connected to the connecting element 22, and a retractable or expandable clamping area is formed between the driving end and the connecting element 22. When the driving end drives the clamping area to retract, it drives the sealing element 21 to switch from the closed position to the open position. When the driving end drives the clamping area to expand, it drives the sealing element 21 to switch from the open position to the closed position.

[0031] In this device, the sealing element 21 is movably disposed at the discharge port of the discharge pipe, which is used to open or seal the discharge port. The connecting element 22 is located on one side of the discharge pipe and is used to cooperate with the bag press to clamp and fix the bag opening. At the same time, the connecting element 22 connects with the sealing element 21 to form a mechanical linkage. While clamping or releasing the bag opening, the bag press component 3 can drive the sealing element 21 to switch between the open and closed positions of the discharge port through the drive end. When the bag is being fed, the clamping end of the bag press component 3 moves away from the connecting element 22, causing the clamping area to expand to facilitate bag installation. At the same time, the sealing element 21 switches from the open position to the closed position, completely blocking the discharge channel. After the bag is in place, the bag press component 3 moves to cause the clamping area to contract, closing the clamping area to clamp the bag, and simultaneously driving the sealing element 21 to switch from the closed position to the open position, ensuring that the material can be discharged smoothly. After the material is discharged, the bag pressing component 3 continues to operate, causing the clamping area to contract and the seal 21 to switch from the closed position to the open position. This allows the clamping area to open and release the bag while the seal 21 closes the discharge port, effectively preventing leakage of residual material in the tube and effectively solving the dripping problem of the existing mechanism during the transition phase.

[0032] Please see Figures 1 to 5 To achieve a proper connection between the sealing element 21 and the connecting element 22, in some possible embodiments, the sealing element 21 and the discharge pipe body 1 are rotated together to switch between open and closed positions. Specifically, one side of the sealing element 21 is rotatably connected to one side of the discharge pipe body 1. By rotating the sealing element 21, the position of the fixed part relative to the connecting element 22 can change, thereby switching the sealing element 21 between open and closed positions. One end of the connecting element 22 is fixedly connected to the rotating position of the sealing element 21, and the other end is connected to the first part of the driving end of the bag pressing component 3, forming a clamping area between its side facing away from the discharge pipe body 1 and the driving end. The size of the clamping area can be adjusted by the movement of the driving end. When the driving end of the bag pressing component 3 approaches the connector 22, the clamping area contracts, achieving a tight clamping of the bag opening. At the same time, the driving end drives the sealing component 21 to rotate to the open position through the connector 22. When the driving end moves away from the connector 22, the clamping area expands, facilitating the installation and removal of the bag. At the same time, the driving end drives the sealing component 21 to rotate to the closed position through the connector 22.

[0033] In one possible embodiment, the sealing element 21 includes a connecting frame 211 and a sealing cover 212. The connecting element 22 includes a connecting plate 221. A rotating support 11 is provided on the top of the side wall of the discharge pipe. One end of the connecting frame 211 is rotatably connected to the rotating support 11, and the other end is fixedly connected to one side of the sealing cover 212. The other side of the sealing cover 212 corresponds to the discharge port of the discharge pipe body 1, and its diameter is larger than the discharge port diameter, used to block or open the discharge port. One end of the connecting plate 221 is fixedly connected to the connecting frame 211 and the rotating support 11, and the other end is connected to the driving end of the bag pressing component 3. The driving end can move relative to the connecting plate 221 to drive the clamping area to contract or expand, and simultaneously drive the connecting frame 211 and the sealing cover 212 to rotate, realizing the switching of the sealing cover 212 between the open position and the closed position.

[0034] Furthermore, to further enhance the sealing effect, in some possible embodiments, a sealing gasket may be provided between the seal 21 and the outlet. When the seal 21 is in the closed position, the sealing gasket is tightly compressed between the seal 21 and the outlet, forming an effective sealing barrier and effectively preventing material leakage in the tiny gap between the seal 21 and the outlet. The sealing gasket is preferably made of wear-resistant and corrosion-resistant materials to ensure long-term stability and reliability.

[0035] When the sealing cover 212 is closed for material discharge, the central axis of the connecting plate 221 is parallel to the central axis of the discharge pipe 1. When the sealing member 21 is in the closed position, the angle between the connecting member 22 and the central axis of the discharge pipe 1 is 30°-60°. Therefore, the maximum opening angle of the sealing member 21 relative to the discharge pipe 1 is limited to between 30° and 60°, which ensures that the material can be discharged smoothly and avoids structural instability caused by the sealing member 21 opening too large.

[0036] Furthermore, the outer side of the connecting frame 211 is provided with a rounded chamfer, which allows the bag to slide more smoothly on the outer side of the connecting frame 211 when installing or removing the bag, avoiding scratches or jamming of the bag and improving the convenience and smoothness of operation.

[0037] It should be noted that in other possible embodiments, the connection between the seal 21 and the discharge pipe 1 is not limited to a rotary connection; other methods such as sliding connection and magnetic connection can also be used, as long as the seal 21 can reliably switch between the open and closed positions. The structural forms of the seal 21 and the connector 22 are not limited to these. For example, in an alternative, the seal 21 can be designed as a sliding block that slides radially along the discharge pipe 1 to block or open the discharge port. One side of the sliding block can be provided with a sealing surface that matches the discharge port. When the sliding block slides radially inward along the discharge pipe 1, the sealing surface tightly fits the discharge port to achieve a seal; when the sliding block slides radially outward along the discharge pipe 1, the sealing surface separates from the discharge port, opening the discharge port. The sliding block is connected to the connecting plate 221 through a mechanical linkage structure, and the connecting plate 221 is then connected to the driving end of the bag pressing component 3. The movement of the driving end drives the sliding block to switch between the blocking and open positions.

[0038] Please see Figure 1 , Figure 2 as well as Figure 5 Regarding 7, in some possible embodiments, the bag-pressing component 3 includes a bag-pressing part 31 and a bag-pressing drive part 32. One end of the bag-pressing part 31 has a connecting part and a bag-pressing part, which are fixed together. The bag-pressing part is located on the side of the connecting part closer to the seal 21. The connecting part is connected to the connecting part 22, and a clamping area is formed between the bag-pressing part and the connecting part 22. The bag-pressing drive part 32 is fixedly installed on the outside of the discharge pipe body 1, and its output end is connected to the other end of the bag-pressing part 31. It is used to synchronously drive the connecting part and the bag-pressing part of the bag-pressing part 31 to move relative to the connecting part 22, so as to drive the clamping area to contract or expand. At the same time, it drives the seal 21 to switch between the open position and the closed position through the connecting part. The bag-pressing drive part 32 can be a driving element such as a cylinder, an electric push rod, or a hydraulic cylinder, as long as it can provide sufficient driving force to realize the bag-pressing action and the linkage control of the seal 21.

[0039] In one possible embodiment, the bag-pressing component 31 includes a bag-pressing block 311. The top end of the bag-pressing block 311 is detachably connected to the output rod of the bag-pressing drive component 32 via a connecting structure 33. A connecting portion and a bag-pressing portion are formed on both sides of the bottom end of the bag-pressing block 311, respectively. The connecting portion is located on the side away from the sealing component 2 and has a sliding groove 312. Cylindrical sliding members 223 are provided on both sides of the end of the connecting plate 221 near the connecting end. The sliding members 223 can slide back and forth along the sliding groove 312 and can rotate around their own axis within the sliding groove 312. The bag-pressing block 311 and the connecting plate 221 can be rotatably connected through the sliding members 223. When the bag-pressing drive component 32 drives the bag-pressing block 311 to move, the bag-pressing block 311 drives the connecting portion and the bag-pressing portion to move relative to the connecting plate 221. At this time, the sliding members 223 slide and rotate within the sliding groove 312 to accommodate the rotation of the connecting plate 221 on the connecting frame 211. As shown in the figure, the pressing block 311 presses down and causes the right end of the connecting plate 221 to rotate downward, so that the upper surface of the connecting plate 221 can contact the left side of the bottom end of the pressing block 311 to hold the bag. At the same time, the rotation of the connecting plate 221 drives the sealing cover 212 to rotate synchronously through the connecting frame 211, realizing the switch from the closed position to the open position.

[0040] Furthermore, to improve the clamping effect on the bag, in some embodiments, the upper surface of the connecting plate 221 is a clamping surface 222. The clamping surface 222 is a non-flat surface, such as a surface with grooves, waves, serrations, or anti-slip textures, to increase the friction between it and the bag. When the clamping area contracts, the driving end of the bag pressing component 3 engages with the clamping surface 222 of the connecting member 22, working together at the bag opening to ensure that the bag is firmly clamped and to prevent slippage or leakage during the discharge process.

[0041] In some possible embodiments, the connecting structure 33 includes a threaded sleeve 331 and a threaded rod 332 connected to the bag-pressing drive member 32. The threaded rod 332 passes through the threaded sleeve 331 and is threadedly engaged with the threaded sleeve 331. The bag-pressing block 311 is fixedly disposed at the end of the threaded sleeve 331 away from the bag-pressing drive member 32. Meanwhile, the sliding member 223 is a bolt threadedly connected to the connecting plate 221. After the bolt is threadedly connected to the connecting plate 221, its smooth portion is disposed within the sliding groove 312, with its head protruding outside the sliding groove 312. The diameter of the head is larger than the width of the sliding groove 312 to prevent the bolt from falling out of the sliding groove 312. The threaded structure facilitates the disassembly and installation of the bag-pressing block 311. Furthermore, the adjustability of the threaded connection allows for fine-tuning of the relative position between the bag-pressing block 311 and the connecting plate 221 to ensure accurate alignment and stable clamping of the clamping area.

[0042] Please see Figures 1 to 7Secondly, this application also provides a valve-type packaging machine, including a leak-proof discharge mechanism as described in any of the above embodiments. The valve-type packaging machine further includes a packaging machine body 4, a bag-pressing drive component 32 fixedly mounted on the packaging machine body 4, and an output rod corresponding to the discharge pipe 1. When filling the bag, the operator first places the bag below the discharge pipe 1 and adjusts the position of the bag so that the opening of the valve bag fits over the discharge pipe 1. Subsequently, the bag-pressing drive component 32 is activated, driving the bag-pressing block 311 to move downwards. The connecting part of the bag-pressing block 311 slides and rotates within the groove 312 of the connecting plate 221 via a sliding member 223. The bag-pressing part gradually approaches and presses the bag opening against the connecting plate 221. Simultaneously, the connecting part and the connecting plate 221 drive the sealing cap 212 to switch from a closed position to an open position, opening the discharge port. Material begins to fill the bag under the action of the valve-type packaging machine. During the filling process, the bag-pressing component 3 maintains stable clamping of the bag, ensuring that the material does not leak. After the material is filled, the bag pressing drive 32 moves in the opposite direction, driving the bag pressing block 311 to move upward. The connecting part and the connecting plate 221 drive the sealing part 21 to switch from the open position to the closed position. At the same time, the clamping area gradually expands, releasing the bag body. At this time, the bag body can be removed. When the bag body is removed, the outlet remains sealed, effectively preventing material residue and leakage.

[0043] This invention features a discharge pipe 1, a sealing component 2, and a bag-pressing component 3. When the packaging bag is in place, the bag-pressing component 3 clamps the bag while simultaneously switching the sealing component 21 to the open position, ensuring unobstructed discharge. After discharge, the mechanism automatically drives the sealing component 21 to the closed position the instant the packaging bag is released, effectively blocking the flow path of residual material in the discharge pipe. This device uses only mechanical linkage and can achieve coordinated control of sealing and bag clamping. It eliminates the need for complex sensing systems to ensure precise action coordination. This linkage design achieves full-process sealed control of the discharge process, solving the dripping problem of traditional discharge mechanisms during pipe pulling, thus avoiding material waste and environmental pollution, and improving discharge efficiency.

[0044] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0045] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A leak-proof material discharge mechanism, characterized in that, include: Discharge pipe body; A sealing component includes a seal and a connector. The seal is movably disposed at the outlet of the discharge pipe body and has a closed position for sealing the outlet and an open position for opening the outlet. The connector is disposed on one side of the discharge pipe body and is fixedly connected to the seal. The bag-pressing component has a drive end connected to the connector, forming a retractable or expandable clamping area between the drive end and the connector. When the drive end causes the clamping area to retract, it causes the seal to switch from a closed position to an open position. When the drive end causes the clamping area to expand, it causes the seal to switch from an open position to a closed position.

2. The leak-proof discharge mechanism according to claim 1, characterized in that, One side of the seal is rotatably connected to one side of the discharge pipe body. One end of the connector is fixedly connected to the seal, and the other end is connected to the first part of the driving end of the bag pressing component. The clamping area is formed between the side of the connector away from the discharge pipe body and the driving end.

3. The leak-proof discharge mechanism according to claim 2, characterized in that, The clamping surface of the connector corresponding to the clamping area is a non-flat surface. When the clamping area contracts, the driving end of the bag pressing component matches the clamping surface of the connector.

4. The leak-proof discharge mechanism according to claim 1, characterized in that, The bag-pressing component includes a bag-pressing member and a bag-pressing drive member. One end of the bag-pressing member has a connecting part and a bag-pressing part. The connecting part is connected to the connecting member. The bag-pressing part is located on the side of the connecting part close to the sealing member, and a clamping area is formed between it and the connecting member. The bag-pressing drive is fixedly installed on the outside of the discharge pipe body, and its output end is connected to the other end of the bag-pressing component. It is used to drive the bag-pressing component to move relative to the connector so as to drive the clamping area to contract or expand.

5. The leak-proof discharge mechanism according to claim 4, characterized in that, The connecting part of the bag-pressing component is provided with a sliding groove, and both sides of one end of the connecting component are provided with sliding parts. The sliding parts can slide back and forth along the sliding groove and can rotate around their own axis within the sliding groove.

6. The leak-proof discharge mechanism according to claim 4, characterized in that, The bag-pressing component and the bag-pressing drive component are detachably connected by a connecting structure.

7. The leak-proof discharge mechanism according to claim 6, characterized in that, The connection structure includes a threaded sleeve and a threaded rod connected to the bag-pressing drive component. The threaded rod passes through the threaded sleeve and is threadedly engaged with the threaded sleeve. The bag-pressing component is located at the end of the threaded sleeve away from the bag-pressing drive component.

8. The leak-proof discharge mechanism according to claim 4, characterized in that, The bag-pressing drive component includes a cylinder, a hydraulic cylinder, or an electric push rod.

9. The leak-proof discharge mechanism according to claim 1, characterized in that, When the seal is in the closed position, the angle between the connector and the central axis of the discharge pipe is 30°-60°, and the opening angle of the seal relative to the discharge pipe is 30° to 60°.

10. A valve-type packaging machine, characterized in that, Includes the leak-proof discharge mechanism as described in any one of claims 1-9.

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