A device for sealing and cutting off the edge of a delivery bag

Abstract

The utility model relates to express bag production instrument technical field provides an express bag edge sealing cutting device with high finished product strength and edge not easy to crack, including the crossbeam for fixing whole cutting device and setting on the crossbeam for providing the down pressure and absorbing the reaction force down pressure air cylinder, down pressure air cylinder lower extreme is equipped with the cutting knife structure for cutting off and hot melt express bag, its characterized in that: cutting knife structure includes the electric heating block of setting down pressure air cylinder lower extreme and the cutting knife of setting in electric heating block bottom, the position of electric heating block bottom at cutting knife side edge has the hot head structure of hot pressing in one piece, the gap between hot head structure and cutting knife is 0.1mm 5mm, express bag is sent into below cutting knife, through down pressure air cylinder down pressure electric heating block and synchronous down pressure cutting knife and hot head structure, will express bag hot melt after cutting off separation.

Description

Technical Field

[0001] This utility model relates to the field of express bag production equipment technology, specifically to an express bag sealing and cutting device. Background Technology

[0002] Express delivery bags are widely used in the express delivery industry to wrap documents, invoices, goods, and other packages. They are usually made of polyethylene, which is low in manufacturing cost, strong in toughness, waterproof, moisture-proof, lightweight, and convenient. During the production of express delivery bags, two layers of film are first laminated together, and then pressed down with a sealing knife to fuse the two layers of film together. The sealing knife is very hot, and while pressing down, it also cuts the fused film from the middle to form individual express delivery bags. The process is highly automated and produces smooth cut edges, greatly improving the efficiency of express delivery bag processing.

[0003] Chinese Patent No. CN100530769C discloses a sealing device for a diaphragm bag, characterized by comprising a cylinder and a base. Between the cylinder and the base are a guide rod fixing plate, an electric heating knife, an electric heating knife fixing plate, a pressure plate guide rod, an electric heating knife guide rod, two pressure plates, and a pad. The lower end of the cylinder push rod is connected to the guide rod fixing plate. A pair of electric heating knife guide rods and a pair of pressure plate guide rods are connected to the guide rod fixing plate. Two pressure plates are fixed to the lower ends of the two pressure plate guide rods, with a 1-3mm gap between the two pressure plates. An electric heating knife fixing plate is located at the lower end of the two electric heating knife guide rods, and an electric heating knife with a cutting edge is located below the electric heating knife fixing plate. The cutting edge of the electric heating knife is aligned with the gap between the two pressure plates. The pad is placed on the base. The stroke of the pressure plate guide rod is greater than the stroke of the electric heating knife guide rod. This device has a simple structure, enabling the two layers of diaphragm paper to be bonded together after melting and simultaneously cut. The sealing width of the diaphragm bag is small, almost invisible, resulting in a relatively small diaphragm bag size. When the equipment operates, the blade leaves the diaphragm for a certain time interval before the pressure plate leaves. This allows the bag opening to cool quickly after melting, and the two diaphragm layers fuse together rapidly. Therefore, the diaphragm bag is less prone to cracking, especially when the electrode thickness is greater than 0.2mm, ensuring the quality of the diaphragm bag.

[0004] Although the aforementioned patents can solve the corresponding technical problems, they still have certain drawbacks: the existing sealing devices use an electric heating knife to press down on the bag, thereby breaking the edge of the bag and then burning it at high temperature to melt it and fuse it together to achieve the purpose of sealing the edge. However, the produced express bags only have one closed edge formed by burning. When the express bags are used, they are often stretched, and it is easy for cracks to occur at the burned edge, resulting in poor sealing strength of the express bags and difficulty in effectively protecting the contents inside. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings and deficiencies of the existing technology by providing a sealing and cutting device for express bags that produces high-strength finished products with edges that are less prone to cracking.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sealing and cutting device for express bags, comprising a crossbeam for fixing the entire cutting device and a pressing cylinder disposed on the crossbeam for providing downward pressure and absorbing reaction force. The lower end of the pressing cylinder is provided with a cutting structure for cutting and heat-sealing the express bag. The cutting structure is characterized in that: the cutting structure includes an electric heating block disposed at the lower end of the pressing cylinder and a cutting blade disposed at the bottom of the electric heating block. A hot pressing head structure is integrally formed at the bottom of the electric heating block located on the side of the cutting blade. The gap between the hot pressing head structure and the cutting blade is 0.1mm-5mm. The express bag is fed under the cutting blade, and the pressing cylinder presses down the electric heating block and simultaneously presses down the cutting blade and the hot pressing head structure to heat-seal and cut the express bag.

[0007] A further improvement is that the hot press head structure includes a first hot press head integrally formed at the bottom of the heating block and located on one side of the cutter.

[0008] A further improvement is that the hot press head structure also includes a second hot press head integrally formed on the bottom of the heating block and located on the other side of the cutter.

[0009] A further improvement is that the gap between the first hot press head and the cutter is 0.1mm-3mm.

[0010] A further improvement is that the gap between the second hot press head and the cutter is 0.1mm-3mm.

[0011] A further improvement is that a fixing cylinder is also provided on the side wall of the crossbeam, and a flattening frame for express bags is provided at the bottom of the fixing cylinder.

[0012] A further improvement is that the end of the crossbeam is also provided with a lifting frame that allows the crossbeam to rise and fall.

[0013] A further improvement is that a limiting frame for restricting the upward height of the cutter is also provided through the crossbeam, and the lower end of the limiting frame is in contact with the upper surface of the cutter.

[0014] A further improvement is that the gap between the first hot press head and the cutter is 0.1mm-1.5mm.

[0015] A further improvement is that the gap between the second hot press head and the cutter is 0.1mm-1.5mm.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are as follows: This invention uses a cutter and a hot press head to seal and cut the edges of the express bag. It uses hot pressing instead of burning to bond the two layers of express bag film together, making the connection stronger and more stable. This prevents the edges from cracking due to pulling during use and increases the strength.

[0017] The gap between the cutter and the hot press head structure of this utility model is 0.1mm-5mm, which makes the edge of the finished express bag shorter and reduces the size of the express bag, making the produced express bag more flexible and convenient to use. At the same time, the internal volume remains unchanged, and the loading capacity of the produced express bag can also be guaranteed.

[0018] This invention uses a cutter to cut the express bag and a hot press head structure to seal the edges. This allows the heating temperature of the hot press head structure to be much lower than that of the existing burn-out cutter head, reducing energy consumption in the production process and thus reducing production costs. At the same time, the lower temperature can also better reduce the risk of injury caused by accidental contact and improve the safety of use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the edge-sealing and cutting device of this utility model; Figure 2 This is a front view structural schematic diagram of the edge sealing and cutting device of this utility model; Figure 3 This is a schematic diagram of the left side of the edge sealing and cutting device of this utility model; Figure 4 This is a schematic diagram of the left cross-section of the cutting structure of this utility model. Detailed Implementation

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] See Figure 1-4As shown, the technical solution adopted in this specific embodiment is: a sealing and cutting device for express bags, including a crossbeam 2 for fixing the entire cutting device and a pressing cylinder 4 disposed on the crossbeam 2 for providing downward pressure and absorbing reaction force. The lower end of the pressing cylinder 4 is provided with a cutting structure 5 for cutting and heat-sealing the express bag. The cutting structure 5 includes an electric heating block 51 disposed at the lower end of the pressing cylinder 4 and a cutting blade 54 disposed at the bottom of the electric heating block 51. The bottom of the electric heating block 51 is integrally located on the side of the cutting blade 54. The device is equipped with a hot press head structure, which includes a first hot press head 52 integrally formed at the bottom of the heating block 51 and located on one side of the cutter 54. The gap between the hot press head structure and the cutter 54 is 0.1mm-5mm. When the express bag is fed under the cutter 54, the heating block 51 is pressed down by the pressing cylinder 4, and the cutter 54 and the hot press head structure are pressed down simultaneously to heat-melt and cut the express bag. In use, the crossbeam 2 is fixed to the material conveying device of the express bag, and then the two layers of express bag film are conveyed by the material conveying device. When the cutting structure 5 is lowered, the heating block 51 is simultaneously energized to heat up, which in turn heats the hot pressing head structure. At this point, the pressing cylinder 4 can press the cutting structure 5 downwards, thereby causing the heating block 51 and the cutting blade 54 at its bottom to descend simultaneously. The first hot pressing head 52 of the hot pressing head structure also descends simultaneously, applying heat and pressure to the contact points between the two layers of the express bag film. The heat bonds the two layers of the express bag film together, sealing the edges to form the express bag. This process is coordinated with the pressing cylinder 4... Absorbing excessive pressure, the cutter 54 extends from the first hot press head 52, at which point the hot-pressed express bag can be cut and separated by the cutter 54. The gap between the first hot press head 52 and the cutter 54 is 0.1mm-5mm, thus making the gap between the cut edge and the hot press edge extremely small. At this point, the finished express bag can be obtained. The finished product is bonded to the two layers of express bag film by hot pressing rather than burning, thus making the connection between them stronger and more stable, avoiding the edge cracking due to pulling during use, and having higher strength. The hot press head structure also includes a second hot press head 53 integrally formed on the bottom of the heating block 51 and located on the other side of the cutter 54, which is conducive to hot pressing from both sides at the same time, so that two express bags can be processed at the same time with a single press, making the processing efficiency faster. The gap between the first hot press head 52 and the cutter 54 is 0.1mm-3mm, which helps to further reduce the edge thickness, making the express bag smaller, more aesthetically pleasing, and more flexible in use; The gap between the second hot press head 53 and the cutter 54 is 0.1mm-3mm, which helps to further reduce the edge thickness, making the express bag smaller, more aesthetically pleasing, and more flexible in use; The side wall of the crossbeam 2 is also provided with a fixing cylinder 6, and the bottom end of the fixing cylinder 6 is provided with a courier bag flattening frame 7, which is beneficial to press down during the sealing process to firmly press the courier bag onto the processing table, thereby avoiding the courier bag from moving and affecting the accuracy of cutting and sealing. Multiple fixing cylinders 6 and courier bag flattening frames 7 can be provided and simultaneously set on both sides of the crossbeam 2. When set on both sides of the crossbeam 2, a better pressing and fixing effect on the courier bag material can be obtained. The end of the crossbeam 2 is also provided with a lifting frame 1 that can raise and lower the crossbeam 2. This is beneficial for the crossbeam 2 to move up and down in conjunction with the material conveying device after it is installed on the express bag material conveying device, thereby speeding up the pressing speed, making the cutting more thorough and complete, and preventing adhesion. The crossbeam 2 is also provided with a limiting frame 3 for limiting the rising height of the cutter 54. The lower end of the limiting frame 3 is in contact with the upper surface of the cutter 54, which helps to prevent the cutter 54 from moving too high and being unable to extend out of the hot press head structure, thus ensuring the cutting effect on the express bag. The gap between the first hot press head 52 and the cutter 54 is 0.1mm-1.5mm, which helps to further reduce the edge thickness of the finished express bag; The gap between the second hot press head 53 and the cutter 54 is 0.1mm-1.5mm, which helps to further reduce the edge thickness of the finished express bag.

[0023] Meanwhile, the cutter 54 can also be heated, and after cutting, the cut edge of the express bag can be burned off in a conventional way. This allows the burned-off cut edge to work with the heat-fused edge, further enhancing the edge strength of the express bag after production and further preventing cracking.

[0024] The working principle of this utility model is as follows: When in use, the crossbeam 2 is fixed to the raw material conveying device of the express bag. Then, the two layers of express bag film are conveyed to the cutter structure 5 via the raw material conveying device. Simultaneously, the heating block 51 is energized, causing it to heat up and synchronously heat the hot pressing head structure. At this time, the cutting structure 5 can be pressed downwards by the pressing cylinder 4, thereby causing the heating block 51 and the cutter 54 at the bottom of the heating block 51 to descend simultaneously. The first hot pressing head 52 of the hot pressing head structure also descends simultaneously. The first hot pressing head 52 heats and presses the two layers of express bag film at the contact point, using heat to press the two layers together. The courier bag film is bonded together to seal its edges and form a courier bag. At the same time, the pressure cylinder 4 absorbs excessive pressure and causes the cutter 54 to extend from the first hot pressing head 52. At this time, the cutter 54 can cut and separate the hot-pressed courier bag. The gap between the first hot pressing head 52 and the cutter 54 is 0.1mm-5mm, which makes the gap between the cut edge and the hot pressing edge extremely small. At this time, the finished courier bag is obtained. The finished product is bonded together by hot pressing rather than burning, so that the connection between the two layers of courier bag film is stronger and more stable, avoiding the edge cracking due to pulling during use, and has higher strength.

[0025] This utility model aims to protect the structure of the product. The model numbers of the components are not the focus of this utility model's protection, as they are common technology. Any component on the market that can achieve the functions described above can be used as an option. Therefore, the model numbers and other parameters of the components are not described in detail in this utility model. The contribution of this utility model lies in the scientific combination of the various components.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions provided are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model, defined by the appended claims and their equivalents. Any aspects of this utility model not detailed herein are well-known to those skilled in the art.

Claims

1. A sealing and cutting device for express delivery bags, comprising a crossbeam (2) for fixing the entire cutting device and a pressing cylinder (4) disposed on the crossbeam (2) for providing downward pressure and absorbing reaction force, wherein the lower end of the pressing cylinder (4) is provided with a cutting structure (5) for cutting and heat-sealing express delivery bags, characterized in that: The cutting structure (5) includes an electric heating block (51) located at the lower end of the pressing cylinder (4) and a cutting blade (54) located at the bottom of the electric heating block (51). The bottom of the electric heating block (51) is integrally formed with a hot pressing head structure located on the side of the cutting blade (54). The gap between the hot pressing head structure and the cutting blade (54) is 0.1mm-5mm. The express bag is fed into the cutting blade (54). The electric heating block (51) is pressed down by the pressing cylinder (4) and the cutting blade (54) and the hot pressing head structure are pressed down simultaneously to heat melt and cut the express bag.

2. The sealing and cutting device for express delivery bags according to claim 1, characterized in that: The hot press head structure includes a first hot press head (52) integrally formed on the bottom of the heating block (51) and located on one side of the cutter (54).

3. The sealing and cutting device for express delivery bags according to claim 2, characterized in that: The hot press head structure also includes a second hot press head (53) integrally formed on the bottom of the heating block (51) on the other side of the cutter (54).

4. The sealing and cutting device for express delivery bags according to claim 2, characterized in that: The gap between the first hot press head (52) and the cutter (54) is 0.1mm-3mm.

5. The sealing and cutting device for express delivery bags according to claim 3, characterized in that: The gap between the second hot press head (53) and the cutter (54) is 0.1mm-3mm.

6. The sealing and cutting device for express delivery bags according to claim 1, characterized in that: The side wall of the crossbeam (2) is also provided with a fixed cylinder (6), and the bottom end of the fixed cylinder (6) is provided with a flattening frame (7) for express bags.

7. A sealing and cutting device for express delivery bags according to claim 1 or 6, characterized in that: The end of the crossbeam (2) is also provided with a lifting frame (1) that allows the crossbeam (2) to rise and fall.

8. The sealing and cutting device for express delivery bags according to claim 1, characterized in that: The crossbeam (2) is also provided with a limiting frame (3) for limiting the rising height of the cutter (54), and the lower end of the limiting frame (3) is in contact with the upper surface of the cutter (54).

9. The sealing and cutting device for express delivery bags according to claim 4, characterized in that: The gap between the first hot press head (52) and the cutter (54) is 0.1mm-1.5mm.

10. The sealing and cutting device for express delivery bags according to claim 5, characterized in that: The gap between the second hot press head (53) and the cutter (54) is 0.1mm-1.5mm.

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