A hot die device for producing a packaging bag

Abstract

The utility model relates to packing bag production equipment technical field, the utility model provides a kind of ironing mould device for packing bag production, to solve the problem of existing square bottom bag ironing mould switching specification needs to disassemble or debugging, long downtime and low efficiency. The device includes heating plate;Two ironing mould assemblies are symmetrically slidably connected on heating plate, and ironing mould assembly all includes sliding plate, and sliding plate is slidably connected on heating plate;Ironing knife is located at the side of sliding plate away from heating plate, and ironing knife is used to melt and adhere to the bottom of packing bag with heat. The device can quickly adjust the width and angle of ironing edge, without overall disassembly, reduce downtime, improve ironing edge precision and production efficiency, adapt to multi-variety square bottom bag production.

Description

Technical Field

[0001] This utility model relates to the technical field of packaging bag production equipment, specifically to a hot stamping device for packaging bag production. Background Technology

[0002] Square bottom bags are widely used in packaging for food, daily necessities, and chemical products due to their advantages such as stable capacity and good uprightness. In the production of square bottom bags, bottom edge pressing is a key process. This involves heating and pressurizing multiple layers of substrate at the bottom of the bag using a heat-sealing device, causing the substrates to melt and bond together to form a sealed bottom structure with sufficient strength. The width of the heat-sealed edge directly affects the sealing performance, load-bearing capacity, and appearance quality of the bag bottom. Existing hot stamping devices for square bottom bags typically employ a fixed structure design, meaning the working area of ​​the hot stamping die is matched to the required edge width of a specific square bottom bag. When switching between production of different models and sizes of square bottom bags, the required bottom edge width varies (e.g., from 5mm to 15mm), and the existing fixed-structure hot stamping die cannot quickly adjust the edge width. Operators must disassemble and replace the entire die, or repeatedly adjust parameters of the heating and pressurizing components. In the above operations, on the one hand, mold assembly and disassembly require a significant amount of manual time, and the equipment must be stopped during the process, resulting in a substantial increase in downtime. On the other hand, parameter adjustment relies on the operator's experience, making it difficult to guarantee adjustment accuracy, and the adjustment process is prone to producing defective products, further reducing production efficiency. Especially under the current demand for multi-variety, small-batch square bottom bags, the inconvenience of adjusting the existing hot stamping device is even more prominent, severely restricting the continuity and efficiency of square bottom bag production, and failing to meet the enterprise's needs for improved production efficiency and cost control. Utility Model Content

[0003] To overcome the above-mentioned defects, the present invention provides a hot stamping device for packaging bag production, which solves the technical problem that in the prior art, when performing bottom hot stamping processing on square bottom bags of different models and sizes, the existing hot stamping mold cannot be quickly adjusted, making it difficult to quickly match the hot stamping width requirements of the bottom of the corresponding square bottom bag. This requires a long time for mold disassembly and assembly or parameter adjustment, resulting in increased equipment downtime and a significant decrease in square bottom bag production efficiency.

[0004] According to one aspect, at least one embodiment of the present invention provides a hot stamping device for producing packaging bags, comprising: Heating plate; Two heat press mold assemblies are symmetrically and slidably connected to the heating plate. Each heat press mold assembly includes: A sliding plate is slidably connected to a heating plate. The hot knife is located on the side of the sliding plate away from the heating plate. The hot knife is used to heat-melt the bottom of the packaging bag.

[0005] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, a groove is provided on the side of the sliding plate facing the heating plate, the cross-section of the groove is trapezoidal, and the short base of the trapezoid faces the heating plate; a guide rail is provided on the side of the heating plate facing the sliding plate, the cross-sectional shape of the guide rail matches the cross-sectional shape of the groove, and the groove and the guide rail slide together.

[0006] For example, in a hot stamping device for producing packaging bags provided in at least one embodiment of this utility model, the guide rail is detachably connected to the heating plate.

[0007] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, a plurality of fastening rods are spaced apart along the length of the guide rail on the side of the heating plate away from the hot stamping knife; one end of the fastening rod is provided with an insertion section, and an annular first shoulder is formed between the insertion section and the rod body of the fastening rod; the outer periphery of the insertion section is provided with an external thread; a through hole is opened on the heating plate for the insertion section to pass through, and an internal thread hole adapted to the external thread of the insertion section is opened on the guide rail; When the fastening rod rotates, the first shoulder can push against the bottom surface of the heating plate, so that the guide rail is tightly attached to the top surface of the heating plate, and the outer wall of the guide rail can press against the inner wall of the slide groove to limit the position of the sliding plate relative to the heating plate.

[0008] For example, in at least one embodiment of the present invention, the guide rail is made of copper or a copper alloy.

[0009] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, a handle is provided at the end of the fastening rod away from the heating plate.

[0010] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, the hot stamping blade is rotatably connected to the sliding plate, and the rotation axis is perpendicular to the top surface of the sliding plate.

[0011] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, the sliding plate is provided with a plurality of positioning holes circumferentially distributed around the rotation axis of the hot stamping knife, the side wall of the hot stamping knife is provided with an extension, a positioning rod is oscillatingly connected to the extension, the free end of the positioning rod has a downwardly protruding insertion part, the insertion part is used to penetrate the extension and insert into the positioning hole to limit the position of the hot stamping knife relative to the sliding plate.

[0012] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, the side of the insertion part near the swing end of the positioning rod has a clearance slope.

[0013] For example, in a hot stamping device for packaging bag production provided in at least one embodiment of the present invention, the swing end of the positioning rod is provided with a torsion spring, which is used to provide torque for the positioning rod to swing close to the positioning hole.

[0014] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the heating plate provides an installation reference for the two heat-sealing mold components, ensuring that the two heat-sealing mold components remain symmetrically distributed during the sliding process. This avoids the heat-sealing mold components from sliding off due to unstable installation reference, thereby ensuring the positional accuracy of the heat-sealing blades in heat-sealing the bottom of the packaging bag. The two heat-sealing mold components are symmetrically slidably connected to the heating plate, allowing the distance between the two heat-sealing mold components to be flexibly adjusted according to the heat-sealing edge width requirements of different specifications of square bottom bags. When switching to produce different models of square bottom bags, the working area distance between the heat-sealing blades can be changed simply by sliding the two heat-sealing mold components, without the need for complete disassembly and assembly of the heat-sealing device. This solves the problem of disassembly and replacement required for existing fixed-structure heat-sealing molds, significantly reducing equipment downtime. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a heat-sealing device for producing packaging bags in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the first cross-sectional structure of the heat-pressing device in the embodiment; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 1 Enlarged view at point C; Figure 5 for Figure 1 A schematic diagram of the second cross-sectional structure of the heat-pressing device in the embodiment; Figure 6 for Figure 5 Enlarged view of section B in the middle.

[0017] In the diagram: 1. Heating plate, 2. Hot stamping mold assembly, 21. Sliding plate, 22. Hot stamping knife, 211. Slide groove, 3. Guide rail, 4. Fastening rod, 41. Insertion section, 42. First shoulder, 43. Grip handle, 212. Positioning hole, 221. Extension, 5. Positioning rod, 51. Insertion section, 511. Relief slope. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] This embodiment relates to the technical field of packaging bag production equipment, specifically to the bottom edge hot-pressing process of square bottom bags. Square bottom bags, due to their stable capacity and good uprightness, are widely used in the packaging of food, daily necessities, and chemical products. The bottom edge hot-pressing process is a key step in ensuring the bag bottom's sealing performance, load-bearing capacity, and appearance quality. This process requires heating and pressurizing multiple layers of substrate at the bottom of the bag using a hot-pressing device, achieving heat fusion bonding between the substrates. Heat fusion bonding refers to heating the substrates to a molten state, then applying pressure to cause the molten substrates to adhere together. After cooling, a stable bonded structure is formed, resulting in a bag bottom structure that meets strength requirements.

[0024] like Figure 1 As shown, this device includes a heating plate 1 and two hot stamping mold assemblies 2. The heating plate 1 is a rectangular plate structure and serves as the basic load-bearing component of the entire device, used to provide the heat required for hot melting. The two hot stamping mold assemblies 2 are symmetrically distributed on the top surface of the heating plate 1 and form a sliding connection with the heating plate 1. The sliding directions are opposite, that is, when one hot stamping mold assembly 2 moves closer to the other hot stamping mold assembly 2, the other hot stamping mold assembly 2 can move away from it, or the two hot stamping mold assemblies 2 move closer and farther away simultaneously.

[0025] Each heat-pressing assembly 2 includes a sliding plate 21 and a heat-pressing blade 22. The sliding plate 21 is a plate-shaped structure adapted to the top surface of the heating plate 1, and its bottom surface contacts the top surface of the heating plate 1 to form a sliding fit. The heat-pressing blade 22 is a long strip-shaped structure fixed to the top surface of the sliding plate 21 (i.e., the side of the sliding plate 21 facing away from the heating plate 1). The length of the heat-pressing blade 22 is adapted to the length of the area to be heat-pressed at the bottom of the square bottom bag, and is used to directly contact the multi-layer substrate at the bottom of the packaging bag to achieve heat-melt bonding after heating and pressurization.

[0026] The overall workflow of the device is as follows: First, adjust the distance between the two heat-pressing mold components 2 according to the required heat-pressing edge width of the square bottom bag to be produced; after the distance is determined, fix the position of the heat-pressing mold components 2; then start the heating plate 1, the heat generated by the heating plate 1 is transferred to the sliding plate 21, and then from the sliding plate 21 to the heat-pressing blade 22, so that the heat-pressing blade 22 reaches the preset heat-melting temperature; finally, transport the multi-layer substrate of the bottom of the square bottom bag to the space between the two heat-pressing blades 22, the heat-pressing blade 22 applies pressure to the substrate and holds it for a preset time, the substrate is heated and melted and then bonded, completing the bottom heat-pressing edge processing of the bag.

[0027] To ensure the stable sliding of the heat-pressing mold assembly 2 and prevent it from detaching from the heating plate 1, this device further designs the sliding connection structure between the sliding plate 21 and the heating plate 1, such as... Figure 2 As shown.

[0028] A groove 211 is provided on the bottom surface of the sliding plate 21 (the side facing the heating plate 1). The groove 211 extends along the sliding direction of the sliding plate 21 and has a trapezoidal cross-section, with the shorter base of the trapezoid facing the heating plate 1. Correspondingly, a guide rail 3 is provided on the top surface of the heating plate 1 (the side facing the sliding plate 21). The length direction of the guide rail 3 is consistent with the extension direction of the groove 211, and the cross-sectional shape is perfectly matched with the cross-sectional shape of the groove 211. The groove 211 is fitted onto the outside of the guide rail 3, forming a sliding fit between the groove 211 and the guide rail 3. This fit structure can limit the displacement of the sliding plate 21 in the direction perpendicular to the top surface of the heating plate 1, preventing the sliding plate 21 from detaching from the heating plate 1 during sliding or operation. At the same time, it ensures that the sliding plate 21 can only move along the length direction of the guide rail 3, ensuring the accuracy of the spacing adjustment.

[0029] Optionally, the guide rail 3 and the heating plate 1 are detachably connected, specifically by bolts or clips. In this embodiment, the fastening rod 4 is used to achieve both detachability and position fixation. Figure 3 As shown. The bottom surface of the heating plate 1 (the side opposite to the hot knife 22) is provided with multiple fastening rods 4 at intervals along the length of the guide rail 3. One end of the fastening rod 4 is integrally formed with an insertion section 41. The outer periphery of the insertion section 41 is provided with external threads. An annular first shoulder 42 is formed between the insertion section 41 and the rod body of the fastening rod 4. The heating plate 1 is provided with a through hole that penetrates the upper and lower surfaces. The diameter of the through hole is larger than the diameter of the insertion section 41, allowing the insertion section 41 to pass through. The bottom surface of the guide rail 3 is provided with an internal threaded hole, the specification of which is adapted to the external thread of the insertion section 41.

[0030] When it is necessary to fix the position of the sliding plate 21, rotate the fastening rod 4, and the insertion section 41 is screwed into the internal thread hole. The first shoulder 42 gradually approaches and pushes against the bottom surface of the heating plate 1. As the fastening rod 4 continues to rotate, the pushing force of the first shoulder 42 against the heating plate 1 increases, so that the top surface of the heating plate 1 is tightly attached to the bottom surface of the guide rail 3. At the same time, the outer wall of the guide rail 3 exerts a squeezing force on the inner wall of the slide groove 211, and the displacement of the sliding plate 21 relative to the heating plate 1 is limited by friction. When it is necessary to adjust the spacing, rotate the fastening rod 4 in the opposite direction, and the insertion section 41 is screwed out of the internal thread hole. The first shoulder 42 is disengaged from the bottom surface of the heating plate 1, the squeezing force between the guide rail 3 and the slide groove 211 is released, and the sliding plate 21 can slide along the guide rail 3.

[0031] To improve heat transfer efficiency, the guide rail 3 is made of copper or copper alloy. Since the heat from the heating plate 1 needs to be transferred to the sliding plate 21 via the guide rail 3, and then to the hot iron 22, copper or copper alloy has excellent thermal conductivity, which can accelerate the heat transfer speed and shorten the preheating time of the hot iron 22. At the same time, copper or copper alloy has good thermal uniformity, which can avoid the local temperature of the hot iron 22 being too high or too low, and reduce the problems of excessive heat melting or poor adhesion of the substrate caused by uneven temperature.

[0032] Furthermore, to simplify the operation of the fastening rod 4, a handle 43 is provided at the end of the fastening rod 4 away from the heating plate 1 (i.e., the end away from the insertion section 41). The handle 43 is cylindrical or hexagonal in shape, with a diameter larger than that of the fastening rod 4, increasing the contact area between the operator's hand and the fastening rod 4 and reducing slippage during rotation. The operator can easily rotate the fastening rod 4 by simply holding it with their hand without the need for tools such as wrenches, shortening the operation time for fixing and unlocking the position and improving adjustment efficiency.

[0033] To address the issue of varying bottom folding angles in square-bottom bags of different specifications, this device incorporates a rotatable design for the heating blade 22. Figure 4 As shown. The hot knife 22 is rotatably connected to the top surface of the sliding plate 21. Specifically, a rotating shaft can be set at the center of the top surface of the sliding plate 21, with the axis of the rotating shaft perpendicular to the top surface of the sliding plate 21. The bottom surface of the hot knife 22 is connected to the rotating shaft, and the rotating shaft is inserted into the shaft hole to form a rotational fit. Optionally, a bearing can be installed between the rotating shaft and the shaft hole to reduce rotational friction, making the angle adjustment of the hot knife 22 smoother, and reducing wear after long-term use.

[0034] To fix the adjusted angle of the hot iron 22, this device is equipped with an angle positioning structure, such as... Figures 4-6 As shown. The top surface of the sliding plate 21 is provided with a plurality of positioning holes 212. The positioning holes 212 are evenly distributed circumferentially around the rotation axis of the hot knife 22. The number of positioning holes 212 can be set according to the angle adjustment accuracy requirements. The side wall of the hot knife 22 is integrally formed with an extension 221. The extension 221 is a plate-shaped structure extending from the side wall of the hot knife 22 away from the rotation axis. A positioning rod 5 is oscillatingly connected to the extension 221 by a pin. The positioning rod 5 can rotate around the pin.

[0035] The free end (the end furthest from the pin) of the positioning rod 5 is provided with an insertion part 51. The insertion part 51 is a downwardly extending protruding structure with a cross-sectional size that matches the diameter of the positioning hole 212. It can pass through the through hole opened on the extension part 221 and be inserted into the positioning hole 212. When the hot knife 22 is adjusted to the target angle, the positioning rod 5 is swung to insert the insertion part 51 into the corresponding positioning hole 212, which can restrict the rotation of the hot knife 22 and fix the angle. When it is necessary to adjust the angle again, the positioning rod 5 is swung away from the positioning hole 212 to disengage the insertion part 51 from the positioning hole 212.

[0036] Optionally, the insertion part 51 is provided with a clearance slope 511 on the side near the swing end of the positioning rod 5. The clearance slope 511 extends from the top surface to the bottom surface of the insertion part 51 to avoid rigid interference between the insertion part 51 and the edge of the positioning hole 212, reduce insertion resistance, and improve ease of operation.

[0037] Furthermore, a torsion spring 6 is provided at the swing end (the end near the pin) of the positioning rod 5. One end of the torsion spring 6 is connected to the positioning rod 5, and the other end is connected to the extension 221. When the operator swings the positioning rod 5 away from the positioning hole 212, the torsion spring 6 is twisted and stores elastic potential energy. After the positioning rod 5 is released, the torsion spring 6 releases the elastic potential energy, generating a torque that drives the positioning rod 5 to swing towards the positioning hole 212, so that the insertion part 51 automatically inserts into the positioning hole 212, realizing automatic angle locking. This structure can prevent the operator from forgetting the locking step. At the same time, during the operation of the equipment, the continuous torque of the torsion spring 6 can prevent the insertion part 51 from dislodging from the positioning hole 212 due to vibration, ensuring the stability of the angle of the hot knife 22.

[0038] In this embodiment, the heating plate 1 serves as the basic support component, providing a stable installation reference for the two heat-pressing mold components 2, ensuring that the heat-pressing mold components 2 are always symmetrically distributed, thus laying the foundation for the accuracy of spacing adjustment. The two symmetrically sliding heat-pressing mold components 2 can quickly adjust their spacing to adapt to the heat-pressing edge width requirements of different specifications of square bottom bags through the cooperation of the sliding plate 21 and the guide rail 3, without the need to disassemble the entire heat-pressing mold, significantly reducing equipment downtime and improving production continuity.

[0039] The trapezoidal cross-section groove 211 cooperates with the guide rail 3, which not only restricts the displacement of the sliding plate 21 in the direction perpendicular to the top surface of the heating plate 1, preventing the sliding plate 21 from detaching from the heating plate 1, but also ensures that the sliding plate 21 moves only in the preset direction, preventing the deviation of the hot edge width caused by sliding offset and improving the hot edge accuracy; the guide rail 3 is made of copper or copper alloy, which accelerates the transfer of heat from the heating plate 1 to the hot knife 22, shortens the preheating time, and the heat is evenly distributed, reducing the problem of poor hot melting of the substrate.

[0040] The detachable connection design of the guide rail 3 allows the guide rail 3 to be replaced individually after wear, without having to replace the entire heating plate 1, thus reducing maintenance costs. The fastening rod 4, through the first shoulder 42 and thread engagement, can stably fix the position of the sliding plate 21, preventing the sliding plate 21 from shifting during operation. Combined with the design of the grip handle 43, the operation of the fastening rod 4 is simplified, further improving adjustment efficiency.

[0041] The rotating connection structure of the hot knife 22 can adjust the working angle according to the folding angle requirements of different square bottom bags, expanding the applicability of the device; the cooperation between the positioning hole 212 and the positioning rod 5 accurately fixes the angle of the hot knife 22 and avoids angle deviation; the yielding slope 511 guides the insertion part 51 to accurately align with the positioning hole 212, reducing operating resistance; the continuous torque provided by the torsion spring 6 realizes automatic angle locking, prevents disengagement caused by vibration, and improves the reliability of the device.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat-sealing device for producing packaging bags, characterized in that, include: Heating plate (1); Two heat-pressing mold assemblies (2) are symmetrically and slidably connected to the heating plate (1). Each heat-pressing mold assembly (2) includes: A sliding plate (21) is slidably connected to the heating plate (1); A hot knife (22) is located on the side of the sliding plate (21) away from the heating plate (1). The hot knife (22) is used to heat-melt the bottom of the packaging bag.

2. The hot stamping device for packaging bag production according to claim 1, characterized in that, The sliding plate (21) has a groove (211) on the side facing the heating plate (1). The groove (211) has a trapezoidal cross-section, and the short base of the trapezoid faces the heating plate (1). The heating plate (1) has a guide rail (3) on the side facing the sliding plate (21). The cross-sectional shape of the guide rail (3) matches the cross-sectional shape of the groove (211), and the groove (211) and the guide rail (3) slide together.

3. The hot stamping device for packaging bag production according to claim 2, characterized in that, The guide rail (3) is detachably connected to the heating plate (1).

4. The hot stamping device for packaging bag production according to claim 3, characterized in that, The heating plate (1) is provided with a plurality of fastening rods (4) spaced apart along the length of the guide rail (3) on the side away from the hot knife (22); one end of the fastening rod (4) is provided with an insertion section (41), and an annular first shoulder (42) is formed between the insertion section (41) and the rod body of the fastening rod (4); the outer periphery of the insertion section (41) is provided with an external thread; the heating plate (1) is provided with a through hole for the insertion section (41) to pass through, and the guide rail (3) is provided with an internal thread hole that matches the external thread of the insertion section (41); When the fastening rod (4) rotates, the first shoulder (42) can push against the bottom surface of the heating plate (1), so that the guide rail (3) fits tightly against the top surface of the heating plate (1), and the outer wall of the guide rail (3) can press against the inner wall of the slide groove (211) to limit the position of the sliding plate (21) relative to the heating plate (1).

5. A hot stamping device for packaging bag production according to claim 2, characterized in that, The guide rail (3) is made of copper or copper alloy.

6. A hot stamping device for producing packaging bags according to claim 4, characterized in that, The fastening rod (4) has a handle (43) at the end opposite to the heating plate (1).

7. The hot stamping device for packaging bag production according to claim 1, characterized in that, The hot knife (22) is rotatably connected to the sliding plate (21), and the rotation axis is perpendicular to the top surface of the sliding plate (21).

8. A hot stamping device for producing packaging bags according to claim 7, characterized in that, The sliding plate (21) is provided with a plurality of positioning holes (212) circumferentially distributed around the rotation axis of the hot knife (22). The side wall of the hot knife (22) is provided with an extension (221). A positioning rod (5) is oscillatingly connected to the extension (221). The free end of the positioning rod (5) has a downwardly protruding insertion part (51). The insertion part (51) is used to penetrate the extension (221) and insert into the positioning hole (212) to limit the position of the hot knife (22) relative to the sliding plate (21).

9. A hot stamping device for producing packaging bags according to claim 8, characterized in that, The insertion part (51) has a clearance slope (511) on the side near the swing end of the positioning rod (5).

10. A hot stamping device for producing packaging bags according to claim 8, characterized in that, The swing end of the positioning rod (5) is provided with a torsion spring (6), which is used to provide the torque for the positioning rod (5) to swing close to the positioning hole (212).

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