An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag

Abstract

The present invention relates to an automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, which includes a sealing cylinder with openings at both ends. An inner port cylinder is connected to one port of the sealing cylinder, and the inner port cylinder is a flexible air-permeable and dust-filtering structure. The automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag according to the present invention has the advantages of reducing the leakage of materials from the discharging opening when the filling of materials in the valve bag is completed, and ensuring the normal exhaust of the valve bag from the discharging opening.

Description

Technical Field

[0001] The present invention relates to the technical field of valve bags, and particularly relates to an automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag. Background Art

[0002] A valve bag, commonly known as a bottom-sealed bag, is an internationally popular packaging bag. It is fed from the top or bottom valve opening (i.e., the discharging opening), and a special filling device is used. After filling the material, it is formed into a cube, and the stacked bags are neat and beautiful. It belongs to an environmentally friendly bag. Valve bags are mainly used for packaging powdery or granular solid materials such as edible powder, chemical powder, chemical fertilizer, synthetic materials, explosives, grain, salt, minerals, etc., and flexible items.

[0003] When packaging powdery materials, taking putty powder as an example, after each bag is filled, when the feeding pipe is withdrawn from the discharging opening, due to the air pressure change inside and outside the discharging opening of the valve bag driven by the feeding pipe, a large amount of powder will be ejected, which not only wastes the powder, but also the ejected powder will affect the physical health of the workshop staff. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, so as to solve the problem that the valve bag in the prior art cannot automatically tighten when the feeding pipe is withdrawn, and a lot of materials will be ejected.

[0005] The present invention is realized through the following technical solutions: An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, including a sealing cylinder with both ends open, and an inner opening cylinder is connected to one port of the sealing cylinder, and the inner opening cylinder is a flexible air-permeable and dust-filtering structure.

[0006] Further, a counterweight piece is provided at one end of the inner opening cylinder away from the sealing cylinder.

[0007] Further, the counterweight piece is located on the outer side surface of the inner opening cylinder.

[0008] Further, the counterweight piece is a strip structure, and the counterweight piece is fixed on the inner opening cylinder in the left-right direction.

[0009] Further, there are two counterweight pieces, and the two counterweight pieces are respectively located on the upper end surface and the lower end surface of the inner opening cylinder.

[0010] Further, counterweight blocks are provided on the counterweight piece.

[0011] Further, the counterweight blocks are located at positions close to both ends on the counterweight piece.

[0012] Further, an adhesive layer is provided at one end of the inner opening cylinder away from the sealing cylinder, and the adhesive layer is a ring structure.

[0013] Furthermore, a film lining is provided on the inner side of the sealing cylinder.

[0014] Furthermore, the inner tube is made of Tencel cloth.

[0015] The beneficial effects of the present invention are: an automatic closing sealing mechanism for the discharge port of a valve bag is breathable and leak-proof, the sealing tube is installed in the discharge port of the valve bag, the outer surface of the sealing tube is glued or hot-pressed to the inner surface of the discharge port (or it can also be integrally formed with the discharge port of the valve bag in actual production), and one end of the inner tube faces the inside of the valve bag; when discharging, the discharge pipe is inserted into the discharge port, that is, the discharge pipe is inserted into the sealing tube, and when the discharge pipe encounters the inner tube, the inner tube is stretched open and inserted into the inside of the valve bag for discharging, and when the discharge pipe is completed, the discharge pipe is pulled out of the sealing tube, and when the discharge pipe leaves the inner tube, the port of the inner tube away from the sealing tube automatically closes and droops naturally, achieving the effect of closing and bending, thereby preventing the powder from leaking from the discharge port when the discharge pipe is pulled out, the structure is simple, and the anti-leakage effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the schematic diagrams of the overall structure of Example 1 when it is opened;

[0017] Figure 2 This is the second schematic diagram of the overall structure of Example 1 when it is opened;

[0018] Figure 3 This is a schematic diagram of the closing effect of the inner mouth tube of Example 1;

[0019] Figure 4 This is a schematic diagram of the paving effect of the mechanism of Example 1;

[0020] Figure 5 Schematic diagram of the drooping effect of the inner tube in Example 1.

[0021] Among them: 1. Sealing tube; 2. Inner tube; 3. Counterweight plate; 4. Counterweight block. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] As Figures 1-4 shown, an automatic closing sealing mechanism for the air-permeable and leakage-proof material discharging port of a valve bag includes a sealing cylinder 1 with openings at both ends. The sealing cylinder 1 and the inner cylinder 2 are both cylindrical structures with openings at both ends. The sealing cylinder 1 can be made of kraft paper or multiple layers of kraft paper.

[0026] An inner cylinder 2 is connected to one port of the sealing cylinder 1. The adhesive process can be used to glue the inner cylinder 2 to the outer side of the sealing cylinder 1, that is, the inner side of the inner cylinder 2 is adhesively and fixedly connected to the outer side of the sealing cylinder 1. The inner cylinder 2 is a flexible air-permeable and dust-filtering structure. After the discharging pipe is drawn out, the inner cylinder 2 can automatically close and hang down naturally. At the same time, after hanging down, it still has an exhaust effect, which is convenient for discharging the air in the valve bag, facilitating the stacking of the valve bag. While being air-permeable, it can prevent the leakage of powder materials.

[0027] The inner cylinder 2 is made of tencel cloth. The tencel cloth is a tencel fabric, which has good stability, smoothness, softness, and is air-permeable, dust-filtering, and heat-resistant. In hot weather, when stacking materials for a long time, it is not easily affected by high temperature and does not age. Of course, other materials with the same characteristics can also be selected, such as silk materials, or chemical fiber materials, such as polytetrafluoroethylene fiber materials, or glass fiber products. Of course, an air-permeable membrane can also be selected. In this embodiment, tencel is taken as an example.

[0028] A counterweight piece 3 is bonded to the end of the inner cylinder 2 far from the sealing cylinder 1. The counterweight piece 3 is used to assist the inner cylinder 2 to hang down naturally. Taking tencel as an example, in addition to the above characteristics, tencel is particularly light. Therefore, when the discharging pipe is drawn out, there is a certain probability that it will float up under the influence of the air flow flowing from the inner side to the outer side of the valve bag and cannot quickly hang down to achieve the closing effect, affecting the dust-filtering effect. There is also a certain probability that it will be affected by the air flow flowing from the inner side to the outer side of the valve bag and the driving effect of the discharging pipe, causing the inner cylinder 2 to be rolled into the sealing cylinder 1. When the inner cylinder 2 is rolled in, there will also be wrinkles, so it cannot be automatically closed, affecting the dust-filtering effect.

[0029] After installing the counterweight piece 3, the counterweight piece 3 can first increase the weight of the inner barrel 2 at the end far from the sealing barrel 1, thereby reducing the influence of the airflow. At the same time, the rigidity of the counterweight piece 3 is stronger than that of the inner barrel 2, thereby reducing the occurrence of curling and wrinkling of the inner barrel 2 and reducing the probability of the inner barrel 2 being involved in the inner side of the sealing barrel 1. Here, according to the actual experimental results, the counterweight piece 3 can be made of kraft paper. Of course, other material structures such as plastic sheets and metal sheets can also be selected. Considering the procurement cost, processing cost, and processing difficulty, kraft paper is taken as an example in this embodiment.

[0030] The counterweight piece 3 is located on the outer side of the inner barrel 2. When the counterweight piece 3 is located on the inner side of the inner barrel 2, since the feeding pipe enters the sealing barrel 1 and the inner barrel 2 at a relatively fast speed, when the feeding pipe penetrates from the inner side of the inner barrel 2 and the end contacts the counterweight piece 3, due to its own structure and inertia problems, when the counterweight piece 3 changes from the natural hanging state to the horizontal state, there will be a collision with the feeding pipe. Seriously, it may drive the inner barrel 2 to tear; while when the counterweight piece 3 is located on the outer side of the inner barrel 2, this problem can be effectively avoided;

[0031] In order to further improve the smoothness when the feeding pipe contacts and passes through the counterweight piece 3, the edge of the feeding pipe opening can also be chamfered.

[0032] The counterweight piece 3 is of a strip structure, and the counterweight piece 3 is adhesively fixed to the inner barrel 2 in the left-right direction. As Figures 1-4 shown, taking the strip kraft paper as an example, the structural strength of the strip kraft paper is significantly enhanced compared to the inner barrel 2 made of tencel material, and the weight is significantly increased. While increasing the weight of the inner barrel 2 and improving the hanging effect, it can also effectively prevent the inner barrel 2 from curling.

[0033] There are two counterweight pieces 3, and the two counterweight pieces 3 are adhesively fixed to the upper end face and the lower end face of the inner barrel 2 respectively. Theoretically, the sealing barrel 1 and the inner barrel 2 are of a cylindrical structure, and there is no obvious upper and lower end face boundary when placed horizontally. In fact, when this structure is located in the feeding port of the valve bag, since the valve bags are laid flat and stacked before loading, and when loading is required, the equipment grabs the valve bag to make the valve bag in an upright state, and at the same time the feeding port is located at the top of the valve bag, and then the feeding pipe penetrates into the feeding port for filling; in this case, when the sealing barrel 1 and the inner barrel 2 are flattened and stacked together with the valve bag, this mechanism is actually also in a flattened state, specifically as Figure 4 shown. In this actual situation, the sealing barrel 1 and the inner barrel 2 can be divided into upper and lower end faces. Therefore, it is said that the two counterweight pieces 3 are fixed to the upper end face and the lower end face of the inner barrel 2;

[0034] At this time, the two counterweight pieces 3, in addition to achieving the effects of counterweight and preventing curling, when the material discharge pipe spreads the two counterweight pieces 3 apart from the middle, the two counterweight pieces 3 have a micro-deformation effect of arching in the middle. And when the material discharge pipe is withdrawn, taking the kraft paper as an example for the counterweight piece 3, it also has an elastic deformation effect of restoring to its original state. When restoring to its original state, the counterweight piece 3 drives the port edge of the inner barrel 2 to restore to its original state, that is, a flat closed state. Compared with the closed state with wrinkles, this flat closed state has a better effect of preventing dust from leaking through the gaps.

[0035] Counterweight blocks 4 are provided on the counterweight pieces 3. The use of the counterweight blocks 4 depends on the selection of the counterweight pieces 3. For example, when the counterweight piece 3 is made of kraft paper, in order to further enhance the drooping effect, the counterweight blocks 4 can be added. And when the counterweight blocks 4 can be iron sheets, rubber sheets, and other material counterweight structures here, it is also possible to choose not to add the counterweight blocks 4. In this embodiment, taking the addition of the counterweight blocks 4 and the counterweight blocks 4 being iron sheets as an example, the counterweight blocks 4 are convenient for ensuring the smooth and rapid drooping of the inner barrel 2.

[0036] The counterweight blocks 4 are located at positions on the counterweight pieces 3 close to both ends, such as Figure 3 the positions shown. Since the outer diameter of the material discharge pipe is generally smaller than (even much smaller than) the inner diameter of the material discharge port, when the material discharge pipe spreads the counterweight pieces 3, it is spread from the middle position of the counterweight piece to the upper and lower sides. The closer to the left and right ends of the counterweight piece 3, the less contact with the material discharge pipe, which can effectively avoid collisions between the counterweight blocks 4 and the material discharge pipe 3.

[0037] An adhesive layer is provided at one end of the inner barrel 2 far from the sealing barrel 1. The adhesive layer is in a ring structure. The ring-structured adhesive layer is similar to the structure of the two counterweight pieces 3. However, compared with the counterweight piece 3, the glue can directly penetrate into the inner barrel 2 made of materials such as tencel, with a more firm combination. And the solid structure after the glue solidifies also has advantages in structural strength and weight compared with the inner barrel 2 made of tencel materials, playing the role of preventing wrinkles and assisting in drooping;

[0038] A film lining is adhesively attached to the inner side of the sealing barrel 1. The film can be selected from common film materials for valve bags such as PE. The surface is smooth, which is convenient for the material discharge pipe to pass through, reducing the risk of the sealing barrel 1 being torn by the material discharge pipe due to the large inner surface friction coefficient. Of course, it is also possible to directly select a film-coated kraft paper. The film and the kraft paper are integrally formed, with high structural strength and better friction reduction effect.

[0039] Working principle: Install this mechanism in the material discharge port of the valve bag. When the valve bag is clamped on the loading equipment, the state of this mechanism is as shown in Figure 4 shown. When the material discharge pipe penetrates into the material discharge port, it first spreads the sealing barrel 1, and then spreads the inner barrel 2, as shown in Figure 1As shown, it enters the valve bag and fills in the powder material. After the filling is completed, the feeding pipe is withdrawn. When the feeding pipe leaves the counterweight piece 3, the counterweight piece 3 starts to drive the edge of the inner barrel 2 to restore to its original state, close naturally, and start to droop. When the feeding pipe leaves the inner barrel 2, the inner barrel 2 has already closed and drooped, as Figure 5 shown. Because when filling the valve bag with materials, the space inside the bag cannot be completely filled, there is still space for the inner barrel 2 at the top of the bag body to droop, thus preventing the powder material from being discharged through the inner barrel 2 and the discharging port;

[0040] Moreover, during transportation and stacking, due to the extrusion of the material on the inner barrel 2, there is basically no situation of automatic opening and no leakage will occur. The valve bag needs to have a good exhaust effect during transportation and stacking. In the case where the inner barrel 2 prevents powder leakage, it does not affect the gas discharge, thus ensuring the normal use of the valve bag.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, comprising a sealing cylinder (1) with openings at both ends, characterized in that, One end of the sealing cylinder (1) is connected with an inner port cylinder (2), and the inner port cylinder (2) is a flexible breathable dust filtering structure. A counterweight piece (3) is arranged at one end of the inner port cylinder (2) far away from the sealing cylinder (1). The counterweight piece (3) is located on the outer side surface of the inner port cylinder (2). The counterweight piece (3) is a strip-shaped structure, and the counterweight piece (3) is fixed on the inner port cylinder (2) in the left-right direction.

2. The automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag according to claim 1, wherein There are two counterweight pieces (3), and the two counterweight pieces (3) are respectively located on the upper end surface and the lower end surface of the inner port cylinder (2).

3. The automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag according to claim 1, wherein A counterweight block (4) is arranged on the counterweight piece (3).

4. An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, according to claim 3, characterized in that, The counterweight block (4) is located at a position close to both ends on the counterweight piece (3).

5. The automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag according to claim 1, characterized in that, One end of the inner port cylinder (2) far away from the sealing cylinder (1) is provided with an adhesive layer, and the adhesive layer is a ring-shaped structure.

6. An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, according to claim 1, characterized in that, A film lining is arranged on the inner side of the sealing cylinder (1).

7. An automatic closing sealing mechanism for air permeability and leakage prevention at the discharging opening of a valve bag, according to claim 1, characterized in that, The inner port cylinder (2) is made of tencel fabric.

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