A bag sealing device for a bag-on-pockets packaging machine

Abstract

The utility model discloses a kind of sealing bag devices of bag feeding type packaging machine, including heat sealing seat, heat sealing driving part, first heat sealing plate, second heat sealing plate, first heat sealing plate is equipped with first heat sealing block, second heat sealing plate is equipped with second heat sealing block, first heat sealing plate is hinged with heat sealing seat by first hinged axle, second heat sealing plate is hinged with heat sealing seat by second hinged axle, it is characterized by: second heat sealing plate is linked with first heat sealing plate by transmission assembly, the body of heat sealing driving part is hinged with heat sealing seat, output end is fixedly connected with first heat sealing plate, when heat sealing driving part operates, first heat sealing plate and second heat sealing plate can be synchronously driven to rotate, so that the rotation angle of first heat sealing plate, second heat sealing plate keeps consistent, and when first heat sealing block, second heat sealing block press-fit heat seal, same press-fit force can be provided to the both sides of packaging bag, prevent one side press-fit not tight, improve the effectiveness and stability of packaging bag bag mouth heat seal.

Description

Technical Field

[0001] This utility model relates to the field of packaging machine technology, specifically to a bag sealing device for a pre-packaged bag packaging machine. Background Technology

[0002] To automate packaging, automatic packaging machines are generally used instead of manual packaging. Operators only need to place the finished bags on the bag picking section of the machine, and the machine can automatically pick up the bags, move the bags, open the bags, fill the bags, and heat seal them.

[0003] Chinese utility model patent publication number "CN219044452U" discloses a bag-feeding packaging machine, including a frame, a bag feeding frame, a bag picking mechanism, a bag feeding mechanism, a bag clamping mechanism, a heat sealing mechanism, a hopper, and a bag opening mechanism. The frame has a bag feeding station, a material feeding station, and a heat sealing station arranged sequentially from left to right. The bag picking mechanism includes a bag picking support plate and a bag picking suction cup, with the suction cup mounted on the support plate. The bag feeding frame is mounted on the frame and corresponds to the bag feeding station. The bag clamping mechanism corresponds to the material feeding station. The lower outlet of the hopper corresponds to the material feeding station. The heat sealing mechanism corresponds to the heat sealing station. The bag opening mechanism includes an opening support plate, a rear suction cup at the bag opening, and a second reciprocating translation mechanism. The second reciprocating translation mechanism is mounted on the frame. The rear suction cup at the bag opening is mounted on the opening support plate. The rear suction cup is located at the material feeding station, and the bag picking suction cup aligns with the rear suction cup at the material feeding station.

[0004] However, according to paragraphs

[0031] to

[0043] of the instruction manual, the heat sealing mechanism of the aforementioned bag packaging machine uses two sets of cylinders to drive two sets of heat sealing blocks to open and close. However, when one set of cylinders malfunctions, the two sets of heat sealing blocks will be unable to stably heat and seal both sides of the bag opening. During discharge, the material will splash out of the bag, resulting in material waste and bag contamination.

[0005] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0006] The purpose of this invention is to provide a bag sealing device for a pre-packaged bag machine that provides more stable heat sealing and compression, in order to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a bag sealing device for a bag packaging machine, comprising a heat sealing seat, a heat sealing drive, a first heat sealing plate, and a second heat sealing plate. The first heat sealing plate is provided with a first heat sealing block, and the second heat sealing plate is symmetrically provided with second heat sealing blocks. The first heat sealing plate is hinged to the heat sealing seat through a first hinge shaft, and the second heat sealing plate is hinged to the heat sealing seat through a second hinge shaft. The second heat sealing plate is linked to the first heat sealing plate through a transmission assembly. The body of the heat sealing drive is hinged to the heat sealing seat, and its output end is fixedly connected to the first heat sealing plate. The operation of the heat sealing drive drives the first heat sealing plate to rotate around the central axis of the first hinge shaft, and the second heat sealing plate rotates synchronously in the opposite direction around the central axis of the second hinge shaft, thereby causing the first heat sealing block and the second heat sealing block to open and close.

[0008] By adopting the above technical solution, when the heat sealing drive is running, it can synchronously drive the first heat sealing plate and the second heat sealing plate to rotate, so that the rotation angle of the first heat sealing plate and the second heat sealing plate is consistent. When the first heat sealing block and the second heat sealing block are pressed and heat sealed, the same pressing force can be provided to both sides of the packaging bag, preventing one side from being not pressed tightly, and improving the effectiveness and stability of heat sealing the opening of the packaging bag.

[0009] The bag sealing device of the above-mentioned bag packaging machine can be further configured as follows: the transmission component includes a first transmission block and a second transmission block. One end of the first transmission block is detachably connected to the first heat sealing plate and the other end is provided with a first transmission gear ring. One end of the second transmission block is detachably connected to the second heat sealing plate and the other end is provided with a second transmission gear ring. The first transmission gear ring and the second transmission gear ring mesh with each other. The first hinge shaft is rotatably engaged with the first transmission block and the second hinge shaft is rotatably engaged with the second transmission block.

[0010] By adopting the above technical solution: when the heat sealing drive pulls the first heat sealing plate to rotate around the central axis of the first hinge shaft, the first transmission block drives the second transmission block to rotate in the opposite direction through the first transmission gear ring and the second transmission gear ring, thereby driving the second heat sealing plate and the first heat sealing plate to rotate relative to or towards each other, so that the first heat sealing block and the second heat sealing block can open and close and rotate synchronously.

[0011] The bag sealing device of the above-mentioned bag packaging machine can be further configured as follows: the first heat sealing plate is provided with a plurality of first connecting bolts, one end of the first connecting bolt is detachably connected to the first heat sealing block and the other end is threadedly engaged with the first heat sealing plate; the second heat sealing plate is provided with a plurality of second connecting bolts, one end of the second connecting bolt is detachably connected to the second heat sealing block and the other end is threadedly engaged with the second heat sealing plate; the rotation of the first connecting bolt causes the first heat sealing block to move relative to the first heat sealing plate, and the rotation of the second connecting bolt causes the second heat sealing block to move relative to the second heat sealing plate.

[0012] By adopting the above technical solution: the first connecting bolt can adjust the distance between the first heat-sealing block and the first heat-sealing plate, and the second connecting bolt can adjust the distance between the second heat-sealing block and the second heat-sealing plate, thereby adjusting the maximum distance of relative movement of the first heat-sealing block and the second heat-sealing block, so that the sealing device can be used for packaging bags of different thicknesses.

[0013] The bag sealing device of the above-mentioned bag packaging machine can be further configured as follows: a first heat sealing block has a first heating hole, a first heating tube is inserted through the first heating hole, a first connecting tube is provided at the end of the first heating tube perpendicular to the central axis of the first heating tube, a first receiving groove for accommodating the first connecting tube is provided on the side of the first heat sealing block, a second heat sealing block has a second heating hole, a second heating tube is inserted through the second heating hole, a second connecting tube is provided at the end of the second heating tube perpendicular to the central axis of the second heating tube, and a second receiving groove for accommodating the second connecting tube is provided on the side of the second heat sealing block.

[0014] By adopting the above technical solution: the first heating tube starts heating from inside the first heating block, and the second heating tube starts heating from inside the second heating block, which can maintain stable heat conduction and keep the heat seal stable within the specified range, thereby improving the stability and effectiveness of heat sealing the bag opening. At the same time, the first heating groove on the side of the first heating block allows the first connecting tube body to be located inside the first heat sealing block, and the second heating groove on the side of the second heating block allows the second connecting tube body to be located inside the second heat sealing block, which can prevent burns caused by accidental contact and improve the safety of the bag sealing device.

[0015] The bag sealing device of the above-mentioned bag packaging machine can be further configured as follows: a first heat sealing protrusion is provided on the outer surface of the first heat sealing block near the second heat sealing block, and a second heat sealing protrusion is provided on the outer surface of the second heat sealing block near the first heat sealing block. The first heat sealing protrusion and the second heat sealing protrusion are symmetrically distributed, and the first heat sealing protrusion and the second heat sealing protrusion cooperate to heat seal the edge of the bag opening.

[0016] By adopting the above technical solution, the shapes of the first heat-sealing protrusion and the second heat-sealing protrusion are consistent with the opening of the packaging bag, which can position and heat-seal the edge of the opening of the packaging bag, thereby creating a sealing pattern parallel to the side of the opening of the packaging bag, improving the aesthetics of the packaging bag seal.

[0017] The sealing device of the aforementioned bag packaging machine can be further configured such that: the heat sealing seat is also provided with a pre-tightening component for adjusting the meshing degree of the first transmission gear ring and the second transmission gear ring. The pre-tightening component includes two sets of adjusting arms symmetrically distributed on both sides of the heat sealing seat. The adjusting arms are rotatably engaged with the heat sealing seat through a connecting shaft. A fan-shaped adjusting plate is provided at one end of the connecting shaft relative to the adjusting arm. The adjusting plate can abut against the outer surface of the second transmission block. The two sets of adjusting arms are linked by an adjusting rod. The adjusting rod can drive the adjusting arms to rotate around the central axis of the connecting shaft, causing the adjusting plate to rotate relative to the second transmission block.

[0018] By adopting the above technical solution: the adjusting plate is fan-shaped, its center is fixedly connected to the connecting shaft, and its arc end abuts against the outer surface of the second transmission block. When the adjusting arm drives the connecting shaft to rotate, the adjusting plate can push out the second transmission block and press the second transmission block against the first transmission block, thereby adjusting the tightness of the meshing of the first transmission gear ring and the second transmission gear ring. The heat sealing pressure of the first heat sealing block and the second heat sealing block can be adjusted according to the heat sealing pressure requirements of the packaging bag.

[0019] The bag sealing device of the above-mentioned bag packaging machine can be further configured such that: the second heat sealing plate is provided with an adjustment component, the adjustment component includes an adjustment rod and an adjustment drive component, one end of the adjustment rod is threadedly connected to the second heat sealing plate and the other end is linked with the adjustment drive component, the adjustment drive component can drive the adjustment rod to move, causing the second heat sealing plate to rotate around the central axis of the second hinge shaft.

[0020] By adopting the above technical solution, the adjusting drive component can pull the adjusting rod, thereby driving the second heat-sealing plate to rotate circumferentially around the central axis of the second hinge shaft, while the first heat-sealing plate rotates in the opposite direction around the central axis of the first hinge shaft, so that the first heat-sealing block and the second heat-sealing block can open and close, which facilitates the inspection and maintenance of the sealing device.

[0021] The beneficial effects of this utility model are as follows: By synchronously driving the first heat-sealing plate and the second heat-sealing plate to rotate relative to or towards each other through the transmission component, the first heat-sealing block and the second heat-sealing block are prompted to open and close. Compared with the method of driving a set of heat-sealing blocks by two sets of cylinders respectively, this application can achieve bidirectional synchronous rotation with only one set of heat-sealing drive components, which can maintain the heat-sealing pressure on both sides of the packaging bag, so that the heat-sealing marks on both sides are symmetrical and consistent. Furthermore, a first heat-sealing protrusion is provided on the first heat-sealing block and a second heat-sealing protrusion is provided on the second heat-sealing block. When heat-sealing the opening of the packaging bag, the first heat-sealing protrusion and the second heat-sealing protrusion can fit against the edge of the opening of the packaging bag and quickly heat-seal and press the edge of the packaging bag.

[0022] In addition, an adjustment component is provided on the heat sealing seat to adjust the maximum rotation angle of the first heat sealing plate and the second heat sealing plate, and a pre-tightening component to adjust the maximum pressing force of the first heat sealing plate and the second heat sealing plate, so that the sealing device can be used for packaging bags of various materials and thicknesses.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the bag sealing device of the bag-feeding packaging machine of this utility model; Figure 2 This is a disassembled schematic diagram of the bag sealing device of the bag-type packaging machine of this utility model; Figure 3 This is a schematic diagram of the combination of the first heat-sealing plate and the second heat-sealing plate of this utility model; Figure 4 This is a schematic diagram of the combination of the pre-tightening component, the second heat-sealing plate, and the second transmission block of this utility model; Labeling notes: 1. Heat sealing seat; 2. Heat sealing drive component; 3. First heat sealing plate; 3. First hinge shaft; 31. First heat sealing block; 32. First heating hole; 321. First receiving groove; 322. First heating protrusion; 323. First connecting bolt; 33. First heating tube; 34. First connecting tube; 341. Second heat sealing plate; 4. Second hinge shaft; 41. Second heat sealing block; 42. Second heating hole; 421. Second receiving groove; 422. Second heating protrusion; 423. Second connecting bolt; 43. Second heating tube; 44. Second connecting tube; 441. Transmission assembly; 5. First transmission block; 51. First transmission gear ring; 511. Second transmission block; 52. Second transmission gear ring; 521. Pre-tightening assembly; 6. Adjusting arm; 61. Connecting shaft; 62. Adjusting plate; 63. Adjusting rod; 64. Adjusting assembly; 7. Adjusting rod; 71. Adjusting drive component; 72. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] A bag sealing device for a bag packaging machine, such as Figures 1 to 4As shown, the device includes a heat-sealing seat 1, a heat-sealing drive 2, a first heat-sealing plate 3, and a second heat-sealing plate 4. The first heat-sealing plate 3 is provided with a first heat-sealing block 32, and the second heat-sealing plate 4 is provided with a second heat-sealing block 42 symmetrically. The first heat-sealing plate 3 is hinged to the heat-sealing seat 1 through a first hinge shaft 31, and the second heat-sealing plate 4 is hinged to the heat-sealing seat 1 through a second hinge shaft 41. The second heat-sealing plate 4 is linked to the first heat-sealing plate 3 through a transmission assembly 5. The heat-sealing seat 1 is also provided with a pre-tightening assembly 6 for adjusting the transmission pressure of the transmission assembly 5. The second heat-sealing plate 4 is provided with an adjustment assembly 7. The heat-sealing drive 2 is a heat-sealing cylinder. The body of the heat-sealing drive 2 is hinged to the heat-sealing seat 1, and the output end is fixedly connected to the first heat-sealing plate 3. When the heat-sealing drive 2 operates, it drives the first heat-sealing plate 3 to rotate around the central axis of the first hinge shaft 31, and the second heat-sealing plate 4 rotates synchronously in the opposite direction around the central axis of the second hinge shaft 41, causing the first heat-sealing block 32 and the second heat-sealing block 42 to open and close. When the heat sealing drive 2 is in operation, it can synchronously drive the first heat sealing plate 3 and the second heat sealing plate 4 to rotate, so that the rotation angle of the first heat sealing plate 3 and the second heat sealing plate 4 is consistent. When the first heat sealing block 32 and the second heat sealing block 42 are pressed and heat sealed, the same pressing force can be provided to both sides of the packaging bag to prevent one side from being not pressed tightly, thereby improving the effectiveness and stability of heat sealing the opening of the packaging bag.

[0027] like Figure 2 , Figure 3 As shown, the first heat-sealing plate 3 is provided with several first connecting bolts 33. One end of each first connecting bolt 33 is detachably connected to the first heat-sealing block 32, and the other end is threaded into the first heat-sealing plate 3. The second heat-sealing plate 4 is provided with several second connecting bolts 43. One end of each second connecting bolt 43 is detachably connected to the second heat-sealing block 42, and the other end is threaded into the second heat-sealing plate 4. Rotation of the first connecting bolts 33 causes the first heat-sealing block 32 to move relative to the first heat-sealing plate 3, and rotation of the second connecting bolts 43 causes the second heat-sealing block 42 to move relative to the second heat-sealing plate 4. The first connecting bolts 33 can adjust the distance between the first heat-sealing block 32 and the first heat-sealing plate 3, and the second connecting bolts 43 can adjust the distance between the second heat-sealing block 42 and the second heat-sealing plate 4, thereby adjusting the maximum distance of relative movement between the first heat-sealing block 32 and the second heat-sealing block 42, so that the sealing device can be used for packaging bags of different thicknesses.

[0028] The first heat-sealing block 32 has a first heating hole 321, a first heating tube 34 passes through the first heating hole 321, a first connecting tube 341 is provided at the end of the first heating tube 34 perpendicular to the central axis of the first heating tube 34, and a first receiving groove 322 for accommodating the first connecting tube 341 is provided on the side of the first heat-sealing block 32. The second heat-sealing block 42 has a second heating hole 421, a second heating tube 44 passes through the second heating hole 421, a second connecting tube 441 is provided at the end of the second heating tube 44 perpendicular to the central axis of the second heating tube 44, and a second receiving groove 422 for accommodating the second connecting tube 441 is provided on the side of the second heat-sealing block 42. The first heating tube 34 heats from inside the first heat-sealing block 32, and the second heating tube 44 heats from inside the second heat-sealing block 42. This ensures stable heat conduction and keeps the heat seal stable within a specified range, improving the stability and effectiveness of heat sealing the bag opening. At the same time, the first receiving groove 322 on the side of the first heat-sealing block 32 allows the body of the first connecting tube 341 to be located inside the first heat-sealing block 32, and the second receiving groove 422 on the side of the second heat-sealing block 42 allows the body of the second connecting tube 441 to be located inside the second heat-sealing block 42. This prevents burns caused by accidental contact and improves the safety of the bag sealing device.

[0029] The outer surface of the first heat-sealing block 32 near the second heat-sealing block 42 has a first heating protrusion 323, and the outer surface of the second heat-sealing block 42 near the first heat-sealing block 32 has a second heating protrusion 423. The first heating protrusion 323 and the second heating protrusion 423 are symmetrically distributed, and the first heating protrusion 323 and the second heating protrusion 423 cooperate to heat seal the edge of the packaging bag opening. The shape of the first heating protrusion 323 and the second heating protrusion 423 is consistent with the opening of the packaging bag, which can perform positioning heat sealing at the edge of the packaging bag opening, thereby creating a sealing pattern parallel to the side of the packaging bag opening, improving the aesthetics of the packaging bag seal.

[0030] The transmission assembly 5 includes a first transmission block 51 and a second transmission block 52. One end of the first transmission block 51 is detachably connected to the first heat-sealing plate 3, and the other end is provided with a first transmission gear ring 511. One end of the second transmission block 52 is detachably connected to the second heat-sealing plate 4, and the other end is provided with a second transmission gear ring 521. The first transmission gear ring 511 and the second transmission gear ring 521 mesh. The first hinge shaft 31 is rotatably engaged with the first transmission block 51, and the second hinge shaft 41 is rotatably engaged with the second transmission block 52. When the heat-sealing drive 2 pulls the first heat-sealing plate 3 to rotate around the central axis of the first hinge shaft 31, the first transmission block 51 drives the second transmission block 52 to rotate in the opposite direction synchronously through the first transmission gear ring 511 and the second transmission gear ring 521, thereby driving the second heat-sealing plate 4 and the first heat-sealing plate 3 to rotate relative to or towards each other, so that the first heat-sealing block 32 and the second heat-sealing block 42 can open and close synchronously.

[0031] like Figure 1 , Figure 2 , Figure 4 As shown, the pre-tightening assembly 6 includes two sets of adjusting arms 61 symmetrically distributed on both sides of the heat-sealing seat 1. The adjusting arms 61 are rotatably engaged with the heat-sealing seat 1 via a connecting shaft 62. A fan-shaped adjusting plate 63 is provided at one end of the connecting shaft 62 relative to the adjusting arms 61. The adjusting plate 63 can abut against the outer surface of the second transmission block 52. The two sets of adjusting arms 61 are linked by an adjusting rod 64. The adjusting rod 64 can drive the adjusting arms 61 to rotate around the central axis of the connecting shaft 62, causing the adjusting plate 63 to rotate relative to the second transmission block 52. The adjusting plate 63 is fan-shaped, with its center fixedly connected to the connecting shaft 62, and its arc end abutting against the outer surface of the second transmission block 52. When the adjusting arm 61 drives the connecting shaft 62 to rotate, the adjusting plate 63 can push out the second transmission block 52, pressing the second transmission block 52 against the first transmission block 51, thereby adjusting the tightness of the meshing of the first transmission gear ring 511 and the second transmission gear ring 521. The heat sealing pressure of the first heat-sealing block 32 and the second heat-sealing block 42 can be adjusted according to the heat sealing pressure requirements of the packaging bag.

[0032] like Figure 1 , Figure 2 As shown, the adjustment assembly 7 includes an adjustment rod 71 and an adjustment drive 72. The adjustment drive 72 is an adjustment handle. One end of the adjustment rod 71 is threadedly connected to the second heat-sealing plate 4, and the other end is linked to the adjustment drive 72. The adjustment drive 72 can drive the adjustment rod 71 to move, causing the second heat-sealing plate 4 to rotate around the central axis of the second hinge shaft 41. The adjustment drive 72 can pull the adjustment rod 71, thereby causing the second heat-sealing plate 4 to rotate circumferentially around the central axis of the second hinge shaft 41. The first heat-sealing plate 3 rotates in the opposite direction around the central axis of the first hinge shaft 31, causing the first heat-sealing block 32 and the second heat-sealing block 42 to open and close, which facilitates the inspection and maintenance of the sealing device.

[0033] The working principle of this embodiment is as follows: the heat sealing drive 2 drives the first heat sealing plate 3 to rotate around the first hinge shaft 31, the first transmission block 51 drives the second transmission block 52 to rotate through the first transmission gear ring 511 and the second transmission gear ring 521, the second heat sealing plate 4 and the second transmission block 52 rotate synchronously around the second hinge shaft 41, the first heat sealing block 32 and the second heat sealing block 42 open outward, and at the same time the heat source connected to the first connecting pipe 341 and the second connecting pipe 441 heats the first heating pipe 34 and the second heating pipe 44 to the specified temperature.

[0034] The filled packaging bag is then transferred to the heat sealing device. The bag opening is located between the first heat sealing block 32 and the second heat sealing block 42. Then, the heat sealing drive 2 pushes the first heat sealing plate 3 to rotate in the opposite direction, and the second heat sealing plate 4 rotates synchronously. The first heat sealing block 32 and the second heat sealing block 42 close, and the first heating protrusion 323 and the second heating protrusion 423 fit against both sides of the bag opening to heat seal the bag opening and complete the sealing of the packaging bag. Then, the heat sealing drive 2 drives the first heat sealing plate 3 to rotate around the first hinge axis 31 again to perform the next sealing operation.

[0035] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A bag sealing device for a bag packaging machine, comprising a heat sealing seat, a heat sealing drive, a first heat sealing plate, and a second heat sealing plate, wherein the first heat sealing plate is provided with a first heat sealing block, and the second heat sealing plate is symmetrically provided with second heat sealing blocks; the first heat sealing plate is hinged to the heat sealing seat via a first hinge shaft, and the second heat sealing plate is hinged to the heat sealing seat via a second hinge shaft, characterized in that: The second heat-sealing plate is linked to the first heat-sealing plate through a transmission assembly. The body of the heat-sealing drive is hinged to the heat-sealing seat, and the output end is fixedly connected to the first heat-sealing plate. The operation of the heat-sealing drive drives the first heat-sealing plate to rotate around the central axis of the first hinge axis, and the second heat-sealing plate rotates in the opposite direction around the central axis of the second hinge axis, causing the first heat-sealing block and the second heat-sealing block to open and close.

2. The sealing device for a bag-type packaging machine according to claim 1, characterized in that: The transmission assembly includes a first transmission block and a second transmission block. One end of the first transmission block is detachably connected to a first heat-sealing plate, and the other end is provided with a first transmission gear ring. One end of the second transmission block is detachably connected to a second heat-sealing plate, and the other end is provided with a second transmission gear ring. The first transmission gear ring and the second transmission gear ring mesh. The first hinge shaft is rotatably engaged with the first transmission block, and the second hinge shaft is rotatably engaged with the second transmission block.

3. The sealing device for a bag-type packaging machine according to claim 2, characterized in that: The first heat-sealing plate is provided with a plurality of first connecting bolts, one end of which is detachably connected to the first heat-sealing block and the other end of which is threadedly engaged with the first heat-sealing plate. The second heat-sealing plate is provided with a plurality of second connecting bolts, one end of which is detachably connected to the second heat-sealing block and the other end of which is threadedly engaged with the second heat-sealing plate. Rotation of the first connecting bolt causes the first heat-sealing block to move relative to the first heat-sealing plate, and rotation of the second connecting bolt causes the second heat-sealing block to move relative to the second heat-sealing plate.

4. The sealing device for a bag-type packaging machine according to claim 3, characterized in that: The first heat-sealing block has a first heating hole, a first heating tube passes through the first heating hole, a first connecting tube is provided at the end of the first heating tube perpendicular to the central axis of the first heating tube, and a first receiving groove is provided on the side of the first heat-sealing block for accommodating the first connecting tube. The second heat-sealing block has a second heating hole, a second heating tube passes through the second heating hole, a second connecting tube is provided at the end of the second heating tube perpendicular to the central axis of the second heating tube, and a second receiving groove is provided on the side of the second heat-sealing block for accommodating the second connecting tube.

5. A bag sealing device for a pre-packaged bag machine according to claim 4, characterized in that: The first heat-sealing block has a first heat-sealing protrusion on its outer surface near the second heat-sealing block, and the second heat-sealing block has a second heat-sealing protrusion on its outer surface near the first heat-sealing block. The first heat-sealing protrusion and the second heat-sealing protrusion are symmetrically distributed, and the first heat-sealing protrusion and the second heat-sealing protrusion cooperate to heat-seal the edge of the packaging bag opening.

6. The sealing device for a bag-type packaging machine according to claim 5, characterized in that: The heat-sealing seat is also provided with a pre-tightening assembly for adjusting the meshing degree of the first transmission gear ring and the second transmission gear ring. The pre-tightening assembly includes two sets of adjusting arms symmetrically distributed on both sides of the heat-sealing seat. The adjusting arms are rotatably engaged with the heat-sealing seat through a connecting shaft. A fan-shaped adjusting plate is provided at one end of the connecting shaft relative to the adjusting arm. The adjusting plate can abut against the outer surface of the second transmission block. The two sets of adjusting arms are linked by an adjusting rod. The adjusting rod can drive the adjusting arms to rotate around the central axis of the connecting shaft, causing the adjusting plate to rotate relative to the second transmission block.

7. A bag sealing device for a pre-packaged bag machine according to claim 6, characterized in that: The second heat-sealing plate is provided with an adjustment assembly, which includes an adjustment rod and an adjustment drive. One end of the adjustment rod is threadedly connected to the second heat-sealing plate, and the other end is linked to the adjustment drive. The adjustment drive can drive the adjustment rod to move, causing the second heat-sealing plate to rotate around the central axis of the second hinge shaft.

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