Low-dust valve port bag

Abstract

The utility model discloses a low dust valve mouth bag relates to the field of packaging, and its technical scheme main points are: including bag body and valve mouth, the bag body top is provided with pressure release, is provided with pressure release subassembly on the pressure release, and the pressure release subassembly includes dustproof box and filter sponge, the dustproof box includes upper baffle and lower baffle, and the upper baffle and lower baffle snap -on connection, and the filter sponge sets up in the dustproof box, is provided with the air hole on the lower baffle, is provided with the exhaust hole on the upper baffle, still is provided with the closure lid on the upper baffle, the closure lid is connected with the upper baffle swing, and the closure lid is used for plugging the exhaust hole. Reach the purpose of reducing dust when filling.

Description

Technical Field

[0001] This utility model relates to the field of packaging, and more specifically, it relates to a low-ash valve bag. Background Technology

[0002] Valve bags, as the mainstream packaging form for powdery materials, offer advantages such as neat stacking, high mechanization, and good transport stability through top or bottom valves, and are widely used in packaging cement, chemical powders, and minerals. Cement, due to its fine powder characteristics (particle size typically <50μm), high fluidity, and the turbulence of the filling airflow, is highly prone to dust formation during the filling stage, leading to dust pollution, material loss, and a deterioration of the working environment. There are two main reasons for this in cement filling: first, a gap exists between the valve and the filling inlet pipe, causing material leakage; current technologies typically address this by matching the valve design to the inlet pipe size or by using a rubber ring to seal the valve within the inlet pipe. Second, during filling, material mixes with air entering the bag, increasing the internal pressure and forcing dust-laden gas to escape through the seams and gaps between fibers of the valve bag. Traditional exhaust structures lack filtration, resulting in direct dust leakage, especially when the valve seal is good; the amount of dust leaking through the valve bag can reach 20-50 grams. Utility Model Content

[0003] To address the problem in the prior art where increased air pressure inside the valve bag during filling leads to leakage of floating ash from the bag, the purpose of this invention is to provide a low-ash valve bag, thereby reducing floating ash.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a low-dust valve bag, comprising a bag body and a valve opening; a pressure relief port is provided above the bag body; a pressure relief assembly is provided on the pressure relief port; the pressure relief assembly includes a dustproof box and a filter sponge; the dustproof box includes an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are interlocked; the filter sponge is disposed inside the dustproof box; a vent hole is provided on the lower cover plate; an exhaust hole is provided on the upper cover plate; a sealing cover is also provided on the upper cover plate; the sealing cover is movably connected to the upper cover plate; the sealing cover is used to block the exhaust hole.

[0005] Furthermore, the upper cover plate is provided with a rotating shaft; the sealing cover is provided with a connecting hole; the connecting hole is inserted into the rotating shaft; the sealing cover rotates around the rotating shaft to block or open the vent hole.

[0006] Furthermore, the lower cover plate includes a base plate and a retaining wall; the retaining wall is disposed on the base plate and protrudes upward; the retaining wall encloses and divides the base plate into an inner area and an outer edge; the inner area of ​​the base plate and the retaining wall form a filter cavity for accommodating the filter sponge; the vent is disposed in the inner area of ​​the base plate; a first retaining edge is provided on the retaining wall; the upper cover plate includes an outer frame; the vent is disposed on the inner side of the outer frame; a sealing plate is also disposed on the inner side of the outer frame; the sealing plate covers the inner side of the outer frame, and the unsealed part is the vent; a sliding groove is provided on the inner side of the outer frame; the two sides of the sealing cover are disposed in the sliding groove; the sealing cover slides along the sliding groove to seal or open the vent; a second retaining edge is provided below the outer frame; the first retaining edge and the second retaining edge cooperate with each other to engage and connect the upper cover plate and the lower cover plate.

[0007] Furthermore, a sealing wall is provided on the base plate; the sealing wall is connected to the card wall and is provided along the inner side of the card wall; the height of the sealing wall is lower than that of the card wall; and the filter sponge is provided with a protrusion adapted to the sealing wall.

[0008] Furthermore, a limiting edge is provided on the inner side of the outer frame; after the upper cover plate and the lower cover plate are engaged, the lower part of the limiting edge abuts against the top of the wall.

[0009] Furthermore, both the first and second locking edges include a locking surface and a sliding surface; the locking surface and the sliding surface are connected; the locking surface is horizontally arranged, and the sliding surface is inclined; the locking surface of the first locking edge and the locking surface of the second locking edge abut against each other.

[0010] Furthermore, a first sealing strip is provided at the top of the card wall.

[0011] Furthermore, a second sealing strip is provided near the vent hole of the sealing plate; the second sealing strip is disposed between the sealing plate and the closing cover.

[0012] In summary, this utility model has the following beneficial effects:

[0013] 1. The filter sponge of the pressure relief component can adsorb particles (such as cement powder) in the dust-laden gas, allowing the gas to enter through the vent holes of the lower cover plate, and then be discharged from the exhaust holes of the upper cover plate after filtration, which greatly reduces the amount of floating dust, reduces environmental pollution and material loss; compared with the traditional unfiltered design, it greatly reduces floating dust leakage.

[0014] 2. During filling, open the vent hole of the sealing cap to ensure stable air pressure inside the bag and prevent gas from escaping through the seams or fiber gaps; after filling, close the sealing cap to achieve a leak-proof seal.

[0015] 3. The dust box uses upper and lower cover plates that snap together for quick and easy installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the valve pocket in Example 1.

[0017] Figure 2 This is a schematic diagram of Example 2.

[0018] Figure 3 This is a schematic diagram of the rotating shaft in the embodiment.

[0019] Figure 4 This is an exploded schematic diagram of Example 3.

[0020] Figure 5 This is a cross-sectional view after the explosion of Example 3.

[0021] Figure 6 and Figure 7 They are Figure 5 Enlarged views of points A and B

[0022] Figure 8 These are cross-sectional views of the installation state in Examples 3-6.

[0023] Figure 9 yes Figure 8 Enlarged view of the part

[0024] In the diagram: 1. Bag body; 2. Valve port; 3. Pressure relief assembly; 4. Top cover plate; 40. Outer frame; 401. Slide groove; 402. Limiting edge; 403. Second locking edge; 41. Rotating shaft; 411. Rotating column; 412. Limiting part; 413. Shrinkage seam; 42. Sealing cover; 43. Sealing plate; 431. Second sealing strip; 5. Filter sponge; 6. Bottom cover plate; 60. Bottom plate; 601. Inner zone; 602. Outer edge; 603. Fourth sealing strip; 61. Locking wall; 611. First locking edge; 612. Sealing wall. Detailed Implementation

[0025] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component. This "connection" is not limited to a fixed connection or a movable connection; the specific connection method should be determined based on the specific technical problem to be solved.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Example 1

[0030] A low-ash valve-sealed bag includes a bag body 1 and a valve 2. The bag body 1 is formed by bonding or sewing together sealing sheets. It includes an upper front sealing sheet, a back sealing sheet, a left sealing sheet, a right sealing sheet, a top sealing sheet, and a bottom sealing sheet. When unfolded, the bag body 1 forms a cuboid shape. The valve 2 is located on top of the bag body 1. The sealing sheet includes a protective layer and an inner lining layer. The protective layer is located on the outer layer of the bag body 1, and the inner lining layer is located on the inner layer of the bag body 1. The protective layer is made of a high-strength material and is used to protect the bag body 1. Optionally, the protective layer is made of polypropylene woven fabric or kraft paper. The inner lining layer is used to prevent material leakage and isolate air, and is made of polyethylene film. The protective layer and the inner lining layer are formed into a sealing sheet by heat pressing or hinged connection.

[0031] The protective layer provides mechanical strength, while the inner lining forms a dense, leak-proof barrier, effectively isolating air and moisture. Cement is prone to caking when damp; this design significantly reduces the risk of moisture absorption during transportation and storage, maintaining the cement's activity. The hot-pressed or articulated sealing strip avoids traditional sewing pinholes, preventing fine cement powder from leaking through the seams.

[0032] Furthermore, to address the issue of internal pressure relief within bag 1 during filling of the valve port 2 bags, a pressure relief port is provided at the top of bag 1; a pressure relief assembly 3 is provided on the pressure relief port; the pressure relief assembly 3 includes a dustproof box and a filter sponge 5; the dustproof box includes an upper cover plate 4 and a lower cover plate 6; the upper cover plate 4 and the lower cover plate 6 are interlocked; the filter sponge 5 is placed inside the dustproof box; the lower cover plate 6 has ventilation holes; the upper cover plate 4 has exhaust holes; the upper cover plate 4 also has a sealing cover 42; the sealing cover 42 is movably connected to the upper cover plate 4; the sealing cover 42 is used to seal the exhaust holes.

[0033] During use, the movable sealing cap 42 opens the vent. The valve port 2 is inserted into the feed pipe, ensuring a tight seal to prevent material leakage. During feeding, the material carries air into the bag body 1, increasing the internal pressure. The airflow carrying the material exits the bag body 1 through the pressure relief component 3. Specifically, the gas exits through the vent, filter sponge 5, and vent. When the material passes through the filter sponge 5, it is trapped, preventing it from entering the airflow. After filling, the movable sealing cap 42 seals the vent, preventing material leakage through the filter sponge 5 during handling and preventing moisture from entering the bag. Even if moisture passes through the gaps in the sealing cap 42, the sponge and the cement ash adsorbed within it trap the moisture. The cement ash in the sponge reacts with the moisture in the air, hardening within the sponge and enhancing the sealing effect, preventing continuous moisture entry.

[0034] This embodiment achieves a pinhole-free seal by combining a double-layer sealing structure with hot pressing or adhesive bonding processes, preventing cement powder leakage from the seams. Simultaneously, the pressure relief component 3's filter sponge 5 and the openable / closed cap 42 trap floating dust during filling and provide moisture-proof sealing after filling, comprehensively reducing material loss and environmental pollution.

[0035] Example 2

[0036] To address the connection issue between the sealing cover 42 and the upper cover plate 4, this embodiment provides a connection method for the sealing cover 42 and the upper cover plate 4. The upper cover plate 4 is provided with a rotating shaft 41; the sealing cover 42 is provided with a connecting hole; the connecting hole is inserted into the rotating shaft 41; the sealing cover 42 rotates around the rotating shaft 41, sealing or opening the vent. The rotating shaft 41 includes a rotating column 411 and a limiting part 412; the rotating column 411 is connected to the upper cover plate 4; the limiting part 412 is located at the top of the rotating column 411; the limiting part 412 is conical; the bottom of the conical limiting part 412 is connected to the top of the rotating column 411. It also includes a shrinkage seam 413; the shrinkage seam 413 extends from the top of the limiting part 412 through the limiting part 412 and extends to the upper part of the rotating column 411. Preferably, it includes two shrinkage seams 413, which are arranged in a cross shape.

[0037] In use, the connecting hole on the sealing cap 42 is inserted into the limiting part 412. The limiting part 412 is compressed, the contraction joint 413 contracts, and the diameters of the limiting part 412 and the rotating column 411 become smaller, facilitating the insertion of the sealing cap 42. When the sealing cap 42 has completely passed the limiting part 412, it unfolds under the action of material elasticity, and the limiting part 412 prevents the sealing cap 42 from falling off the rotating column 411. The sealing cap 42 can rotate along the rotating column 411, and the vent is on the path of rotation of the sealing cap 42; therefore, the sealing cap 42 can close or open the vent during rotation.

[0038] This implementation uses a rotating shaft 41 limiting structure, and utilizes the elasticity of the material to achieve quick installation and prevent the sealing cover 42 from falling off.

[0039] Example 3

[0040] This embodiment provides a pressure relief assembly 3 with a snap-fit ​​connection based on embodiment 1. The pressure relief assembly 3 includes a dustproof box and a filter sponge 5; the dustproof box includes an upper cover plate 4 and a lower cover plate 6; the lower cover plate 6 includes a bottom plate 60 and a retaining wall 61; the retaining wall 61 is disposed on the bottom plate 60 and protrudes upward; the retaining wall 61 encloses and divides the bottom plate 60 into an inner area 601 and an outer edge 602; the inner area 601 of the bottom plate 60 and the retaining wall 61 form a filter cavity for accommodating the filter sponge 5; the vent is disposed in the inner area 601 of the bottom plate 60; the retaining wall 61 is provided with a first snap-fit ​​edge 611;

[0041] The upper cover plate 4 includes an outer frame 40; the vent is located on the inner side of the outer frame 40; a sealing plate 43 is also provided on the inner side of the outer frame 40; the sealing plate 43 covers the inner side of the outer frame 40, and the unsealed part is the vent; a sliding groove 401 is provided on the inner side of the outer frame 40; a sealing cap 42 is located on both sides within the sliding groove 401; the sealing cap 42 slides along the sliding groove 401 to seal or open the vent; when the valve port 2 bags are being filled, the sealing cap 42 is removed along the sliding groove 401, the sealing cap 42 overlaps with the sealing plate 43, and the vent is exposed. After filling is completed, the sealing cap 42 is slid out along the sliding groove 401, the sealing cap 42 covers the vent, and seals the vent. Preferably, a third sealing ring is provided on the edge of the sealing cap 42; the cooperation between the third sealing ring and the sliding groove 401 further reduces the possibility of material leakage.

[0042] A second locking edge 403 is provided below the outer frame 40. The first locking edge 611 and the second locking edge 403 cooperate to lock the upper cover plate 4 and the lower cover plate 6 together. Both the first locking edge 611 and the second locking edge 403 include a locking surface and a sliding surface; the locking surface and the sliding surface are connected; the locking surface is horizontally arranged, and the sliding surface is inclined; the locking surface of the first locking edge 611 and the locking surface of the second locking edge 403 abut against each other. The first locking edge 611 is located at the top of the outer wall of the locking wall 61, with its locking surface facing downwards and the sliding surface located above the locking surface. The second locking edge 403 is located at the lower end of the inner side of the outer frame 40, with its locking surface facing upwards and the sliding surface located below the locking surface.

[0043] In use, after placing the filter sponge 5 inside the dust box, first place the lower cover plate 6 from the inside out onto the pressure relief port; the outer edge 602 of the lower cover plate 6 abuts against the sealing plate of the bag body 1; the retaining wall 61 protrudes through the pressure relief port. Then align the upper cover plate 4 and the lower cover plate 6 and press them down. The sliding surfaces of the first retaining edge 611 and the second retaining edge 403 contact and slide; due to the elasticity of the material itself, the retaining wall 61 contracts inward, and the outer frame 40 expands outward; until the retaining surface of the second retaining edge 403 passes over the retaining surface of the first retaining edge 611, completing the engagement. Optionally, the upper and lower cover plates are made of plastic. At this time, the bottom of the outer frame 40 and the outer edge 602 of the lower cover plate 6 clamp the sealing plate of the bag body 1, completing the fixation of the pressure relief assembly 3. In order to make the upper cover plate 4 and the lower cover plate 6 fit together smoothly during use, one end can be engaged first, and then pressure can be gradually applied to the other end to complete the engagement in sequence. This can avoid the problem of the wall 61 moving inward during the engagement process, which would cause difficulties in engagement.

[0044] In this embodiment, the sliding surface guides the elastic deformation of the card wall 61 to achieve quick installation of the upper / lower cover plate 6; in conjunction with the sliding rail sealing cover 42, the exhaust port can be quickly closed.

[0045] Example 4

[0046] Based on Example 3, this embodiment provides a pressure relief component 3 to enhance the filtration effect. A sealing wall is provided on the base plate 60; the sealing wall is connected to the retaining wall 61 and is positioned along the inner side of the retaining wall 61; the height of the sealing wall is lower than that of the retaining wall 61; the filter sponge 5 has protrusions adapted to the sealing wall. After the filter sponge 5 is placed into the filter chamber, the lower end of the protrusion abuts against the upper end of the sealing wall; when gas inside the bag rises from the gap between the filter sponge 5 and the sealing wall to the protrusion, it is blocked by the protrusion, and the airflow still needs to pass through the filter sponge 5 to be discharged, thus enhancing the filtration effect. This embodiment adds an annular sealing wall + sponge protrusion to the filter chamber, forming a labyrinthine airflow path, forcing dust-laden gas to pass through the sponge body rather than the edge gaps.

[0047] Example 5

[0048] Based on Embodiment 3, this embodiment provides a pressure relief component 3 to solve the sealing problem. A limiting edge 402 is provided on the inner side of the outer frame 40; after the upper cover plate 4 and the lower cover plate 6 are engaged, the lower part of the limiting edge 402 abuts against the top of the retaining wall 61. A first sealing strip is provided on the top of the retaining wall 61.

[0049] A second sealing strip 431 is provided near the vent on the sealing plate 43; the second sealing strip 431 is disposed between the sealing plate 43 and the sealing cover 42. When the sealing cover 42 closes the vent, the second sealing strip 431 between the sealing plate 43 and the sealing cover 42 can prevent moisture in the air from entering the bag, and can also prevent cement from leaking from the bag during transportation.

[0050] A fourth sealing strip 603 is provided on the outer edge 602. The fourth sealing strip 603 is made of an elastic material, such as rubber. After the upper cover plate 4 and the lower cover plate 6 are engaged, the outer frame 40 of the upper cover plate 4 abuts against the sealing strip of the bag body 1. The sealing strip and the fourth sealing strip 603 are pressed together, which can prevent the material in the bag from leaking out through the gap between the lower cover plate 6 and the sealing strip.

[0051] This embodiment solves the leakage problem at the interface of the bag body 1-component through the synergistic effect of a triple sealing system. The fourth sealing strip 603 (rubber material) is deformed under pressure to fill the gaps, and combined with the moisture-proof sealing cover 42 design, it can significantly reduce the leakage of floating dust.

[0052] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A low-ash valve bag, characterized in that: It includes a bag body and a valve port; a pressure relief port is provided on the top of the bag body; a pressure relief assembly is provided on the pressure relief port; The pressure relief assembly includes a dust box and a filter sponge; the dust box includes an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are snap-fitted together; the filter sponge is placed inside the dust box; the lower cover plate is provided with vent holes; the upper cover plate is provided with exhaust holes; the upper cover plate is also provided with a sealing cover; the sealing cover is movably connected to the upper cover plate; the sealing cover is used to block the exhaust holes.

2. The low-ash valve bag according to claim 1, characterized in that: The upper cover plate is provided with a rotating shaft; the sealing cover is provided with a connecting hole; the connecting hole is inserted into the rotating shaft; the sealing cover rotates around the rotating shaft to block or open the vent.

3. The low-ash valve bag according to claim 1, characterized in that: The lower cover plate includes a bottom plate and a retaining wall; the retaining wall is disposed on the bottom plate and protrudes upward; the retaining wall encloses and divides the bottom plate into an inner area and an outer edge; the inner area of ​​the bottom plate and the retaining wall form a filter cavity for accommodating the filter sponge; the vent is disposed in the inner area of ​​the bottom plate; the retaining wall is provided with a first retaining edge; The upper cover plate includes an outer frame; the vent is located on the inner side of the outer frame; a sealing plate is also provided on the inner side of the outer frame; the sealing plate covers the inner side of the outer frame, and the unsealed part is the vent; a sliding groove is provided on the inner side of the outer frame; the two sides of the sealing cover are located in the sliding groove; the sealing cover slides along the sliding groove to seal or open the vent; a second locking edge is provided at the bottom of the outer frame; the first locking edge and the second locking edge cooperate with each other to lock the upper cover plate and the lower cover plate together.

4. A low-ash valve bag according to claim 3, characterized in that: A sealing wall is provided on the base plate; the sealing wall is connected to the card wall and is set along the inner side of the card wall; the height of the sealing wall is lower than that of the card wall; the filter sponge is provided with a protrusion adapted to the sealing wall.

5. A low-ash valve bag according to claim 3, characterized in that: The inner side of the outer frame is provided with a limiting edge; after the upper cover plate and the lower cover plate are engaged, the lower part of the limiting edge abuts against the top of the wall.

6. A low-ash valve bag according to claim 5, characterized in that: Both the first and second locking edges include a locking surface and a sliding surface; the locking surface and the sliding surface are connected; the locking surface is horizontally positioned, and the sliding surface is inclined; the locking surfaces of the first and second locking edges abut against each other.

7. A low-ash valve bag according to claim 6, characterized in that: The top of the card wall is provided with a first sealing strip.

8. A low-ash valve bag according to claim 7, characterized in that: A second sealing strip is provided near the vent of the sealing plate; the second sealing strip is located between the sealing plate and the closing cover.

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