CN220923445U - Sealing and cutting mechanism for bag making machine - Google Patents

Abstract

The utility model relates to a sealing and cutting mechanism for a bag making machine, which comprises a frame, a heat sealing knife assembly and a traction assembly, wherein a cold knife assembly is arranged on one side of the frame corresponding to the heat sealing knife assembly, a driving mechanism for driving the heat sealing knife assembly and the cold knife assembly to seal and cut a film material is arranged on the frame, the heat sealing knife assembly comprises a hot knife rest and a lower base which are oppositely arranged, and a hot knife which is loaded on the hot knife rest and is close to or far from the lower base along with the driving mechanism, the cold knife assembly comprises a cold knife rest arranged on one side of the lower base, a cold knife rest arranged above the cold knife rest, and a cold knife which is loaded on the cold knife rest and is close to or far from the cold knife rest along with the driving mechanism, the distance between the cold knife and the cold knife rest is smaller than the distance between the hot knife and the lower base, the whole automatic edge sealing of a large open bag is realized, the whole process is realized by adjusting the opening size through a positioning and tracking mechanism, the sealing and the heat sealing knife assembly is matched with the cold knife assembly to ensure the sealing flatness, and the yield is improved through the rolling assembly.

Description

Sealing and cutting mechanism for bag making machine

Technical Field

The utility model relates to the field of bag making machines, in particular to a sealing and cutting mechanism for a bag making machine.

Background

The bag making machine is special equipment for making packaging bags and is widely used for producing packaging bags made of various plastic, paper and other materials. The process of forming the packaging bag by the high-speed bag making machine is as follows: the upper film and the lower film are respectively guided and conveyed, the upper film and the lower film are overlapped at a proper position, the overlapped films are sealed by three edges, and finally, a plurality of small bags are formed by cutting, or: and (3) folding a film material in half, sealing two sides of the film material, and finally cutting the film material to form a plurality of small bags.

The patent number of the cutter component of the bag making machine is CN207617200U, which is proposed by the inventor, and comprises a housing which is arranged relatively, wherein one end of the housing is provided with a feeding rubber roller group, and the other end of the housing is provided with a silica gel roller, and the cutter component is characterized in that: one end of the housing, provided with the silica gel roller, is provided with a hot cutter device at a corresponding position of the silica gel roller, a cooling pipe which is arranged oppositely is arranged between the hot cutter device and the silica gel roller, a cooling opening is arranged between the cooling pipes, and the cooling pipe is connected to the housing through an adjusting mechanism capable of adjusting the size of the cooling opening between the cooling pipes, and the utility model has the beneficial effects that: the firmness of the plastic bag after cutting is improved, the cooling opening during cutting can be adjusted to correct the cutting position of the bag more easily, and the stability of the hot cutter device is good.

However, in the above technical scheme, if some large-opening packaging bags (for example, products with long lengths such as automobile bumpers and front covers) need to be processed, the length between the sealing openings of the large-opening packaging bags is also prolonged, taking a common bubble film bag in transportation as an example, when the opening is too large, the sealing surfaces of the bubble film bag are difficult to be leveled according to the characteristics of the bubble film bag, and the pressure between the conveying rollers is difficult to control, when the pressure is too large, bubbles can be damaged, when the pressure is too small, sliding is caused, meanwhile, the hot knife is easy to stick to the bag after sealing, so that defective products are easy to appear in the product processing process.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a sealing and cutting mechanism for a bag making machine aiming at the defects of the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a system bag machine seals mechanism of cutting, includes the frame, sets up the hot-seal knife tackle spare in the frame and sends the membrane material to the traction assembly of hot-blast knife tackle spare department, its characterized in that: the frame corresponds one side of hot-seal knife subassembly and is equipped with cold knife subassembly, be equipped with the actuating mechanism that drive hot-seal knife subassembly and cold knife subassembly seal the membrane material in the frame, hot-seal knife subassembly is close to or keeps away from the hot knife of lower base along with actuating mechanism including hot knife rest and lower base that set up relatively and loading on hot knife rest, cold knife subassembly is including setting up cold knife rest, the cold knife rest of setting in cold knife rest top and loading along with actuating mechanism on cold knife rest and be close to or keep away from the cold knife of cold knife rest, interval between cold knife and the cold knife rest is less than the interval between hot knife and the lower base.

By adopting the technical scheme, the cold knife assembly is arranged on one side of the heat sealing knife assembly, the distance between the cold knife and the cold knife seat is smaller than the distance between the hot knife and the lower base, so that the vertical movement amplitude of the hot knife is larger than that of the cold knife, the film materials can be folded or two overlapped groups of film materials, when the hot knife cuts the film materials downwards, the cold knife firstly abuts the film materials on the cold knife seat, wrinkles on the film materials can be flattened, the phenomenon of air hole opening is not easy to occur when the bag is sealed, and the cut edge of the bag is tidy and attractive; the hot knife is used for heat-sealing and cutting off the bag immediately after the bag is cut off, and the hot knife is used for heating and sealing the edge during edge sealing, so that the film can be heat-sealed while being cut off, a hot-melting edge sealing line is formed on the film, and an edge sealing bag is formed after the film is cut off by hot melting.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the driving mechanism comprises a sealing and cutting speed reducer arranged at the machine frame, a sealing and cutting rotating shaft connected to the machine frame in a rotating manner, an eccentric wheel eccentrically arranged on the sealing and cutting rotating shaft and a double-cutter driving plate movably arranged on the machine frame, wherein a main driving pull rod is arranged between the eccentric wheel and the double-cutter driving plate, one end of the main driving pull rod is hinged to the eccentric wheel, the other end of the main driving pull rod is hinged to the double-cutter driving plate, the sealing and cutting speed reducer drives the sealing and cutting rotating shaft to rotate, the double-cutter driving plate is driven to axially lift along the machine frame, and one end of the double-cutter driving plate, far away from the main driving pull rod, is provided with a cold cutter pull rod and a hot cutter pull rod which are used for driving a cold cutter and a hot cutter to synchronously move.

By adopting the technical scheme, the sealing and cutting speed reducer drives the sealing and cutting rotating shaft to rotate during operation, the sealing and cutting rotating shaft is linked with the eccentric wheel to eccentrically rotate, so that the main driving pull rod hinged on the eccentric wheel can float up and down along with the rotation of the eccentric wheel, and further the double-cutter transmission plate is pulled to axially move, and further the cold cutter pull rod and the hot cutter pull rod on the double-cutter transmission plate are linked to synchronously lift, so that the cold cutter pull rod and the hot cutter pull rod can drive the cold cutter and the hot cutter to synchronously work, further the cold cutter can support the film material before the hot cutter, the film material is separated after the hot cutter, the sealing and cutting time is reduced, the working efficiency is improved, the cold cutter and the hot cutter are respectively reset and are respectively positioned on the upper side of the machine frame, thereby preventing the cold cutter and the hot cutter from obstructing the movement of the film material, and preventing the plastic film which is not heat-sealed and cut.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the machine frame is provided with a linear guide rail corresponding to the double-blade transmission plate, the double-blade transmission plate is provided with a linear sliding block which is arranged on the direct guide rail and slides, two ends of the cold-blade pull rod are respectively hinged with the cold-blade rest and the double-blade transmission plate, and two ends of the hot-blade pull rod are respectively hinged with the hot-blade rest and the double-blade transmission plate.

By adopting the technical scheme, the double-cutter transmission plate axially lifts along the linear guide rail through the linear slide block, so that the cold and hot cutter pull rods are guided in a transmission way, the transmission stability is improved, and the self-adaptive rotation of the cold and hot cutter pull rods with hinged two ends does not interfere the movement of the cold and hot cutters.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the output end of the sealing and cutting speed reducer is provided with a sealing and cutting belt wheel, the sealing and cutting rotating shaft is provided with a driving wheel which is correspondingly driven with the belt wheel, and one end of the sealing and cutting rotating shaft penetrates through the frame and is provided with the eccentric wheel.

By adopting the technical scheme, the seal cutting speed reducer drives the seal cutting belt wheel to rotate, the seal cutting belt wheel rotates through the synchronous belt or the chain belt driving wheel, the driving wheel rotates the linkage seal cutting rotating shaft, and further drives the eccentric wheel to eccentrically rotate, so that the double-shaft axial synchronous motion is driven.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the frame corresponds the front end of heat-seal knife tackle spare and is equipped with draws a roll subassembly, cold knife tackle spare sets up in the heat-seal knife tackle spare and keeps away from the one end of drawing a roll subassembly, draw a roll subassembly including two rubberizing rollers that set up relatively and lower rubber roll, drive rubberizing roller or lower rubber roll pivoted draw a roll motor, draw a roll motor to drive rubberizing roller or lower rubber roll rotation and send into the heat-seal knife tackle spare with the membrane material to reverse rotation back behind the membrane material heat-seal and draw the membrane material forward again and send out the frame with the membrane material.

By adopting the technical scheme, the film material can be stably conveyed onto the hot cutter assembly and the cold cutter assembly through the preposed upper and lower rubber rollers when the pull-roll motor rotates forwards by arranging the pull-roll assembly, after the film material is sealed and cut by the hot cutter, the adhesive knife is further avoided, the pull-roll motor can reversely rotate to pull the subsequent film material, the sealing is avoided from being adhered to the hot knife, and then the sealed and cut film material is pushed out of the frame by forward rotation, so that the stability of the sealing and cutting process is improved.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the output end of the coil pulling motor is provided with a coil pulling driving wheel, one end of the lower rubber roller passes through the frame and is provided with a coil pulling driven wheel which rotates synchronously with the coil pulling driving wheel, two sides of the frame corresponding to the rubber roller are provided with coil pulling adjusting grooves, two sides of the rubber roller are provided with rubber pulling adjusting blocks which can be axially adjusted in the coil pulling adjusting grooves, and then the distance between the rubber roller and the lower rubber roller is controlled.

By adopting the technical scheme, the coil pulling motor drives the coil pulling driving wheel to rotate, the coil pulling driving wheel drives the coil pulling driven wheel to rotate through the synchronous belt, the lower rubber roller is further driven to work, the upper rubber roller axially moves in the coil pulling adjusting groove through the upper rubber adjusting block, the self-adaptive adjusting distance between the upper rubber roller and the lower rubber roller is enabled, and the bag bodies with different thicknesses are adapted to be pulled.

The sealing and cutting mechanism for the bag making machine may further be provided as follows: the machine frame is provided with a positioning tracking mechanism corresponding to the front end of the heat sealing knife assembly, the positioning tracking mechanism comprises a positioning light eye arranged above the machine frame, and the positioning light eye is electrically connected with a driving mechanism.

By adopting the technical scheme, the position to be sealed and cut is positioned by the positioning optical eye, so that the film material moves to a preset distance and then the driving mechanism is controlled to work, and the end is sealed and cut.

The utility model is further described below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present utility model.

Fig. 2 is a schematic perspective view of fig. 2 according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a heat sealing knife assembly and a cold knife assembly according to an embodiment of the utility model.

Fig. 4 is a schematic structural view of a heat sealing knife assembly and a cold knife assembly according to an embodiment of the utility model.

Fig. 5 is a schematic structural diagram of a heat sealing knife assembly and a cold knife assembly in sealing and cutting according to an embodiment of the utility model.

Fig. 6 is a schematic diagram of a heat sealing knife assembly and a cold knife assembly according to an embodiment of the present utility model.

Fig. 7 is a schematic plan view of a heat seal knife assembly and a cold knife assembly according to an embodiment of the utility model.

Fig. 8 is a cross-sectional view AA of fig. 7.

Description of the embodiments

As shown in fig. 1-8, a sealing and cutting mechanism for a bag making machine comprises a frame 1, a heat sealing knife assembly 2 arranged on the frame 1 and a traction assembly 3 for feeding film materials to the heat sealing knife assembly 2, wherein one side of the frame 1 corresponding to the heat sealing knife assembly 2 is provided with a cold knife assembly 4, the frame 1 is provided with a driving mechanism 5 for driving the heat sealing knife assembly 2 and the cold knife assembly 4 to seal film materials, the heat sealing knife assembly 2 comprises a hot knife rest 21 and a lower base 22 which are oppositely arranged and a hot knife 23 which is loaded on the hot knife rest 21 along with the driving mechanism 5, the cold knife rest 4 comprises a cold knife rest 41 arranged on one side of the lower base 22, a cold knife rest 42 arranged above the cold knife rest 41 and a cold knife 43 which is loaded on the cold knife rest 42 along with the driving mechanism 5 and is close to or far away from the cold knife rest 41, the distance between the cold knife rest 43 and the cold knife rest 41 is smaller than that between the cold knife 23 and the lower base 21, namely, the level of the cold knife 43 is lower than that of the hot knife 23, when the hot knife 23 cuts a bag downwards, the hot knife 43 firstly cuts the bag, the cold knife rest 23 is close to the lower base 23 along with the driving mechanism 5, and the hot knife rest 23 is close to or far away from the lower base 22, the hot knife 23 can be contacted with the heat sealing cushion, and the heat sealing cushion material, and the heat sealing cushion is not simultaneously, and the heat sealing cushion is formed by the heat sealing cushion film, and the heat cushion is formed by the heat cushion, and the heat cushion film is not in the heat sealing of the heat sealing cushion, and the heat cushion material, and the heat sealing film is simultaneously when the bag is in contact with the heat sealing cushion and the heat cushion, and the heat cushion is in the heat sealing film, and the heat sealing cushion, and the heat sealing material, and the heat sealing film is in the heat sealing and the film. The hot knife 23 leaves the bag body firstly, and the cold knife 43 leaves the bag body, so that film materials are prevented from being stuck to the mouth of the hot knife 23, the film rises along with the rising of the hot knife 23, the bag is deformed, meanwhile, the film is prevented from being stuck to the hot knife 23 at high temperature for a long time, garbage is accumulated on the edge of the hot knife 23, and the stability of the whole equipment and the quality of the bag are improved.

As shown in fig. 3 and 4, the driving mechanism 5 comprises a sealing and cutting speed reducer 51 arranged at the machine frame 1, a sealing and cutting rotating shaft 52 rotatably connected to the machine frame 1, an eccentric wheel 53 eccentrically arranged on the sealing and cutting rotating shaft 52, and a double-blade driving plate 54 movably arranged on the machine frame 1, wherein a main driving pull rod 55 is arranged between the eccentric wheel 53 and the double-blade driving plate 54, one end of the main driving pull rod 55 is hinged with the eccentric wheel 53, the other end is hinged with the double-blade driving plate 54, the sealing and cutting speed reducer 51 drives the sealing and cutting rotating shaft 52 to rotate, the double-blade driving plate 54 is driven to axially lift along the machine frame 1, one end of the double-blade driving plate 54 away from the main driving pull rod 55 is provided with a cold blade pull rod 56 and a hot blade pull rod 57 which are respectively provided with functions of driving the cold blade 43 and the hot blade 23 to axially synchronously move, the frame 1 is provided with a linear guide rail 11 corresponding to the double-blade transmission plate 54, the double-blade transmission plate 54 is provided with a linear slide block 541 which is arranged on the direct guide rail 11 and slides, two ends of a cold blade pull rod 56 are respectively hinged with the cold blade rest 42 and the double-blade transmission plate 54, two ends of a hot blade pull rod 57 are respectively hinged with the hot blade rest 22 and the double-blade transmission plate 54, the output end of a seal cutting speed reducer 51 is provided with a seal cutting belt wheel 511, the seal cutting rotating shaft 52 is provided with a transmission wheel 521 which is correspondingly transmitted with the belt wheel 511, the driving mechanism 5 drives the eccentric wheel 53 to rotate after the torque is increased through the seal cutting speed reducer 51, the double-blade transmission plate 54 is further linked to axially upgrade, and the cold blade 43 and the hot blade 23 are driven to synchronously work through the cold blade pull rod 56 and the hot blade pull rod 57, so that the cold blade 43 is always better than the hot blade 23 and contacts a bag body before.

As shown in fig. 2-4, the front end of the frame 1 corresponding to the heat-seal knife assembly 2 is provided with a roll pulling assembly 6, the cold knife assembly 4 is arranged at one end of the heat-seal knife assembly 2 far away from the roll pulling assembly 6, the roll pulling assembly 6 comprises two oppositely arranged upper rubber rollers 61 and lower rubber rollers 62, and a roll pulling motor 63 for driving the lower rubber rollers 62 to rotate, the roll pulling motor 63 drives the lower rubber rollers 62 to rotate so as to send the film material into the heat-seal knife assembly 2, the film material is reversely rotated and returned after heat-sealed, then the film material is positively rotated and sent out of the frame 1, the output end of the roll pulling motor 63 is provided with a roll pulling driving wheel 631, one end of the lower rubber rollers 62 penetrates through the frame 1 and is provided with a roll pulling driven wheel 621 which synchronously rotates with the roll pulling driving wheel 631, two sides of the frame 1 corresponding to the upper rubber rollers 61 are provided with roll pulling adjusting grooves 60, two sides of the upper rubber rollers 61 are provided with upper rubber adjusting blocks 611 which can be axially adjusted in the roll pulling adjusting grooves 60, further the distance between the upper rubber rollers 61 and the lower rubber rollers 62 is controlled, and then the bag body after sealing is reversely rotated is prevented from being rolled for a distance to be sent out of the frame 1.

As shown in fig. 1 and 2, the front end of the frame 1 corresponding to the heat-seal knife assembly 2 is provided with a positioning tracking mechanism 7, the positioning tracking mechanism 7 comprises a positioning frame 71 arranged above the frame 1 and a positioning light eye 72 loaded on the positioning frame 71, a positioning movable rod 12 is arranged at the position of the frame 1 corresponding to the positioning frame 71, the positioning frame 71 drives the positioning light eye 72 to horizontally adjust the position on the frame 1, the opening length of a bag body is conveniently and rapidly adjusted, the accurate positioning of a large opening is realized, and the positioning light eye 72 is electrically connected with the seal cutting speed reducer 51 and the coil pulling motor 63.

As shown in fig. 1-8, the sealing and cutting mechanism for the bag making machine of the utility model pulls the film material into the frame 1 through the traction component 3, at this time, the film material can be folded into a film material, one side of the film material is provided with a seal, or can be double-layer film material enters the frame 1 after being sealed by front section ultrasonic waves or one side of a pressing roller, preferably a group of modes are provided, when the film material sealed by one end passes through the positioning and tracking mechanism 7, the position needing to be sealed is positioned through the positioning optical eye 72, then the traction component 3 leads the linkage rolling component 5 to enter the film material into the heat sealing knife component 2 and the cold knife component 4, the positioning optical eye 72 transmits information to the sealing and cutting speed reducer 51 and the rolling motor 63, the sealing and cutting speed reducer 51 drives the eccentric wheel 53 on the sealing and cutting shaft 52 to rotate after the torque is increased, and then the driving main driving pull rod 55 pulls the double-knife driving plate 54 to axially upgrade, the cold knife 43 and the hot knife 23 are driven to synchronously work by the cold knife pull rod 56 and the hot knife pull rod 57, the cold knife 43 is controlled to always be better than the hot knife 23 to contact the bag body before, the cold knife 43 is lower than the hot knife 23 in horizontal height, when the hot knife 23 cuts the bag downwards, the cold knife 43 resists the bag on the cold knife holder 41, the hot knife 23 cuts the bag immediately afterwards, as the hot knife 23 is provided with a seal when being heated, the film can be heat-sealed while being cut, a hot melt edge seal line is formed on the film, the film material is rolled and flattened by the cold knife 43, so that the phenomenon of air hole opening is not easy to occur when the bag is sealed, the cut edge of the bag is tidy and attractive, meanwhile, the heat insulation sponge pad 24 is arranged at the position of the lower base 22 corresponding to the hot knife 23, namely, the knife edge of the hot knife 23 is not in hard contact with the lower base 22, the service life is prolonged, and when the hot knife 23 and the cold knife 43 are enabled to run at the same distance, the thermal knife 23 can be buffered through the heat insulation foam cushion 24 in the back contact process, when the thermal knife 23 cuts the bag and rises, the thermal knife 23 leaves the bag body firstly, and the cold knife 43 leaves the bag body, so that the film material is prevented from being stuck on the mouth of the thermal knife 23, the thermal knife 23 rises along with the rising of the thermal knife 23, the bag is prevented from being deformed, meanwhile, the film is prevented from being stuck on the thermal knife 23 for a long time under high temperature, garbage is accumulated on the edge of the thermal knife 23, the lower rubber roll 62 of the pull-up motor 63 is reversed, the film material after sealing and cutting is pulled and rolled reversely, the follow-up bag body sealing and sticking knife is prevented, the forward rotation is continued, then the film material after sealing and cutting at the front end is pushed out of the frame 1, the whole automatic large open-pocket edge sealing is realized, the whole process is ensured to be smooth through the matching of the heat sealing knife component 2 and the cold knife component 4, the pull-up component 6 is prevented from sticking knife, the yield is improved, and meanwhile, the stable large open sealing and cutting is realized.

Claims (8)

1. The utility model provides a system bag machine seals mechanism of cutting, includes the frame, sets up the hot seal knife subassembly in the frame and sends the membrane material to the traction assembly of hot seal knife subassembly department, its characterized in that: the frame corresponds one side of hot-seal knife subassembly and is equipped with cold knife subassembly, be equipped with the actuating mechanism that drive hot-seal knife subassembly and cold knife subassembly seal the membrane material in the frame, hot-seal knife subassembly is close to or keeps away from the hot knife of lower base along with actuating mechanism including hot knife rest and lower base that set up relatively and loading on hot knife rest, cold knife subassembly is including setting up cold knife rest, the cold knife rest of setting in cold knife rest top and loading along with actuating mechanism on cold knife rest and be close to or keep away from the cold knife of cold knife rest, interval between cold knife and the cold knife rest is less than the interval between hot knife and the lower base.

2. The sealing and cutting mechanism for a bag machine according to claim 1, wherein: the driving mechanism comprises a sealing and cutting speed reducer arranged at the machine frame, a sealing and cutting rotating shaft connected to the machine frame in a rotating manner, an eccentric wheel eccentrically arranged on the sealing and cutting rotating shaft and a double-cutter driving plate movably arranged on the machine frame, wherein a main driving pull rod is arranged between the eccentric wheel and the double-cutter driving plate, one end of the main driving pull rod is hinged to the eccentric wheel, the other end of the main driving pull rod is hinged to the double-cutter driving plate, the sealing and cutting speed reducer drives the sealing and cutting rotating shaft to rotate, the double-cutter driving plate is driven to axially lift along the machine frame, and one end of the double-cutter driving plate, far away from the main driving pull rod, is provided with a cold cutter pull rod and a hot cutter pull rod which are used for driving a cold cutter and a hot cutter to synchronously move.

3. The sealing and cutting mechanism for a bag machine according to claim 2, wherein: the machine frame is provided with a linear guide rail corresponding to the double-blade transmission plate, the double-blade transmission plate is provided with a linear sliding block which is arranged on the direct guide rail and slides, two ends of the cold-blade pull rod are respectively hinged with the cold-blade rest and the double-blade transmission plate, and two ends of the hot-blade pull rod are respectively hinged with the hot-blade rest and the double-blade transmission plate.

4. The sealing and cutting mechanism for a bag machine according to claim 2, wherein: the output end of the sealing and cutting speed reducer is provided with a sealing and cutting belt wheel, the sealing and cutting rotating shaft is provided with a driving wheel which is correspondingly driven with the belt wheel, and one end of the sealing and cutting rotating shaft penetrates through the frame and is provided with the eccentric wheel.

5. The sealing and cutting mechanism for a bag machine according to any one of claims 1 to 4, wherein: the frame corresponds the front end of heat-seal knife tackle spare and is equipped with draws a roll subassembly, cold knife tackle spare sets up in the heat-seal knife tackle spare and keeps away from the one end of drawing a roll subassembly, draw a roll subassembly including two rubberizing rollers that set up relatively and lower rubber roll, drive rubberizing roller or lower rubber roll pivoted draw a roll motor, draw a roll motor to drive rubberizing roller or lower rubber roll rotation and send into the heat-seal knife tackle spare with the membrane material to reverse rotation back behind the membrane material heat-seal and draw the membrane material forward again and send out the frame with the membrane material.

6. The sealing and cutting mechanism for a bag machine according to claim 5, wherein: the output end of the coil pulling motor is provided with a coil pulling driving wheel, one end of the lower rubber roller passes through the frame and is provided with a coil pulling driven wheel which rotates synchronously with the coil pulling driving wheel, two sides of the frame corresponding to the rubber roller are provided with coil pulling adjusting grooves, two sides of the rubber roller are provided with rubber pulling adjusting blocks which can be axially adjusted in the coil pulling adjusting grooves, and then the distance between the rubber roller and the lower rubber roller is controlled.

7. The sealing and cutting mechanism for a bag machine according to any one of claims 1 to 4, wherein: the machine frame is provided with a positioning tracking mechanism corresponding to the front end of the heat sealing knife assembly, the positioning tracking mechanism comprises a positioning light eye arranged above the machine frame, and the positioning light eye is electrically connected with a driving mechanism.

8. The sealing and cutting mechanism for a bag machine according to claim 5, wherein: the machine frame is provided with a positioning tracking mechanism corresponding to the front end of the heat sealing knife assembly, the positioning tracking mechanism comprises a positioning light eye arranged above the machine frame, and the positioning light eye is electrically connected with a driving mechanism.