CN113665179A

CN113665179A - Plastic packaging bag production is with cutting mechanism

Info

Publication number: CN113665179A
Application number: CN202110983236.1A
Authority: CN
Inventors: 崔清磊; 王满意
Original assignee: Henan Zhongsu New Material Co ltd
Current assignee: Hebei Meiyi Food Packaging Technology Co.,Ltd.
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2021-11-19
Anticipated expiration: 2041-08-25
Also published as: CN113665179B

Abstract

The invention discloses a cutting mechanism for producing plastic packaging bags, which comprises a feeding mechanism, a cutting mechanism and a discharging mechanism which are sequentially arranged, wherein a feeding roller capable of pushing materials to feed is arranged in the feeding mechanism; the cutting mechanism is internally provided with a movable material guide channel which can reciprocate along the material feeding direction, the movable material guide channel is internally provided with a hot melting knife and a cutting knife which can extrude towards the middle surface, the hot melting knife and the cutting knife can synchronously or asynchronously begin to extrude, and the extrusion forces of the hot melting knife and the cutting knife can be the same or different; discharge mechanism includes two sets of contained angle adjustable swing boards, and this plastic packaging bag production is with cutting mechanism increases discharge mechanism, can force with breaking away from of preceding bag through pulling to preceding bag, and discharge mechanism increases the swing board that can open and shut, and the feed direction of bag after the guide guarantees the off-the-shelf overlap rate when piling up, realizes piling up orderly effect.

Description

Plastic packaging bag production is with cutting mechanism

Technical Field

The invention relates to the technical field of packaging bag production equipment, in particular to a cutting mechanism for plastic packaging bag production.

Background

The plastic packaging bag is in process of production, need cut the wrapping bag and pile up after, and guarantee to pile up neatly, in order to do benefit to subsequent packing operation, current plastic bag is when cutting, there is the incomplete phenomenon of cutting, there is adhesion between preceding bag and the back bag promptly, cause preceding bag when piling up, receive the back bag influence, can't be neat with original contrast, be unfavorable for off-the-shelf piling up, and because plastic bag self rigidity is relatively poor, very easy deformation when receiving external force, consequently cutting the position, present back bag breaks away from the back completely, the back bag is when continuing to feed, be difficult to continue to advance according to the route of preceding bag, consequently, cause the plastic bag to reproduce the in-process, need constantly adjust equipment, carry out continuous guide to the back bag, in order to guarantee to pile up the overlap ratio of in-process plastic bag, thereby reach the orderly effect of putting things in good order.

Disclosure of Invention

The invention aims to overcome the technical problems in the prior art, and provides a cutting mechanism for producing plastic packaging bags, wherein an unloading mechanism is added, the front bags can be pulled to be separated from the cutting mechanism, an openable swing plate is added to the unloading mechanism to guide the feeding direction of the rear bags, the overlapping rate of finished products during stacking is ensured, the effect of neatly stacking is realized, and the problems in the background art can be effectively solved.

In order to achieve the purpose, the invention provides the following technical scheme: a cutting mechanism for producing plastic packaging bags comprises a feeding mechanism, a cutting mechanism and a discharging mechanism which are sequentially arranged, wherein a feeding roller capable of pushing materials to feed is arranged in the feeding mechanism;

the cutting mechanism is internally provided with a movable material guide channel which can reciprocate along the material feeding direction, the movable material guide channel is internally provided with a hot melting knife and a cutting knife which can extrude towards the middle surface, the hot melting knife and the cutting knife can synchronously or asynchronously begin to extrude, and the extrusion forces of the hot melting knife and the cutting knife can be the same or different;

the discharging mechanism comprises two groups of oscillating plates with adjustable included angles, discharging rollers for driving materials to feed are arranged in the oscillating plates, and when the included angles of the two groups of oscillating plates are at the minimum value, the discharging rollers in the oscillating plates are in a rolling state;

when the hot-melt cutter and the cutting cutter operate synchronously, the hot-melt cutter at the downstream of the cutting cutter can be separated earlier than the cutting cutter.

As a preferred technical scheme of the invention, the circumferential linear speed of the unloading roller is greater than the circumferential linear speed of the feeding roller;

when the front bag contacts with the discharging mechanism, the front bag is driven by the discharging roller inside the front bag to be fed, the rear bag is driven by the feed roller to be fed, the front bag and the rear bag are both driving rollers, rolling friction is generated between the front bag and the plastic bag, the front bag and the rear bag are both rolling rollers, sliding friction does not exist, and when the linear speeds of the front bag and the rear bag are inconsistent, pulling force is generated between the front bag and the rear bag along the feeding direction, so that the front bag and the rear bag can be disconnected at a cutting line.

As a preferred technical scheme of the invention, the discharging mechanism can move obliquely upwards along the arc-shaped track, the bottom of the arc-shaped track is tangent to the feeding direction of the material, and when the discharging mechanism moves upwards along the arc-shaped track, the included angle between the two groups of the inner swinging plates is at the minimum value;

the discharging mechanism also comprises an arc-shaped guide rail fixedly installed, a sliding frame is installed in the arc-shaped guide rail in a sliding mode, one ends of two groups of oscillating plates are rotatably installed with the sliding frame, gear pairs with the transmission ratio of 1 are arranged at rotating shafts of the two groups of oscillating plates, a stepping motor for driving the oscillating plates to rotate is arranged at the rotating shafts of one group of oscillating plates, and meanwhile the discharging mechanism also comprises a telescopic rod for driving the sliding frame to slide along the arc-shaped guide rail;

in the whereabouts in-process of shedding mechanism, its swing board contained angle increases, and the lower extreme of arc guide rail is tangent with material direction of feed, the convenient material that comes from the activity guide passageway enters into the region between two sets of swing boards, subsequently, the swing board angle diminishes, the roller of unloading centre gripping the material, along with the shifting up of shedding mechanism, tear preceding bag and back bag from cutting the line department apart, and promote a take the altitude with preceding bag, and after the roller effect of unloading moves to the assigned position, throw down, guarantee to have the high overlap with the plastic bag that the previous was thrown down, thereby realize piling up neatly, and can set up intermittent motion's conveyer belt at the cooperation of throwing in the position, realize the transportation after the ration is piled up.

As a preferred technical scheme of the invention, the cutting knife comprises a long knife and a C-shaped bent knife, the long knife and the bent knife enclose a closed trapezoidal space, the length of the long side of the trapezoidal space is shorter than that of the long knife, a push plate capable of being pressed down along with the cutting knife is arranged in the trapezoidal space, and the push plate can be pressed down to penetrate through the middle surface of the movable material guide channel in the process of combining and extruding the cutting knife;

for the plastic bag with the hand-held part, the top of the plastic bag also needs a hot melting sewing part, and the area between the two hand-held parts needs to be cut off, but most of the waste materials in the prior art cannot be separated from the finished product or are adhered to the finished product; therefore, the push plate which can be pressed down to pass through the middle surface is additionally arranged, and the acting force which is vertical to the surface of the material is exerted to push the cutting area to be separated from the material.

As a preferred technical solution of the present invention, the hot-melting knife includes a first hot-melting knife and a second hot-melting knife, the first hot-melting knife is located at a downstream side of the elongated knife, the second hot-melting knife is located at an upstream side of the elongated knife, and the second hot-melting knife is in a two-stage shape and is separately located at two sides of the trapezoidal space;

depending on the orientation of the bag during production, the cutting area may be located on the upstream side or the downstream side of the slitting knife, where the second heat-melting knife is designed in two stages and located on both sides of the cutting area for heat-melting the top carrying portion of the bag.

As a preferred technical scheme of the invention, the upper side and the lower side of the movable material guide channel are respectively provided with a tool rest capable of vertically sliding, a vertically arranged rack is arranged in the tool rest, the racks of the upper tool rest and the lower tool rest are simultaneously meshed with a group of gears and are respectively arranged on two sides of the gears, and the hot melting tool, the cutting tool and the push plate are respectively connected with the tool rest on the corresponding side through vertically arranged elastic pieces;

set up drive gear pivoted step motor in cutting the mechanism, when gear revolve, simultaneously with the rack toothing of both sides, drive the knife rest synchronous motion of both sides, realize inside hot melt sword and cut the extrusion of sword and break away from, and extruded contact point is in the well face of activity guide passageway all the time, does not influence the whole direction of feed of material.

As a preferable technical solution of the present invention, the lengths of the elastic elements connected to the knife rest by the first hot-melting knife, the cutting knife, the second hot-melting knife and the push plate are respectively L1, L2, L3 and L4, L1 < L2 < L3 or L1= L3 < L2, and L4 < L2;

the elastic coefficients of the elastic pieces connected with the knife rest by the first hot melting knife, the cutting knife and the second hot melting knife are respectively K1, K2 and K3, and K1L 1= K3L 3 is not more than K2L 2;

through the length restriction to different elastic components, when realizing the knife rest motion, the extrusion and the separation order of different hot melt sword and cutting sword, to the restriction of elastic coefficient simultaneously, realize different hot melt sword and cutting sword when extrudeing completely, possess the ability of different extrusion forces.

As a preferred technical scheme of the invention, the surfaces of the upper wall and the lower wall of a material guide channel for materials to pass through in the feeding mechanism, the cutting mechanism and the discharging mechanism are provided with air guide grooves, the length direction of the air guide grooves is consistent with the feeding direction of the materials, and the air guide grooves are communicated with an external air source through air guide pipes;

through the inside air guide groove that sets up feeding length direction in guide passageway to link to external air supply, can form the air film between the inner wall of guide passageway and material, avoid rubbing between plastic bag and the guide passageway inner wall to produce static, avoid taking place to glue even.

Compared with the prior art, the invention has the beneficial effects that: the cutting mechanism for producing the plastic packaging bag limits the separation sequence after the hot melting cutter and the cutting cutter which operate synchronously are combined, and the linear speed of the downstream side of the cutting cutter is designed to be greater than the linear speed of the upstream side of the cutting cutter, so that the front bag and the rear bag can be pulled and separated at the cutting cutter, and the problem that the front bag and the rear bag are still adhered after being cut is solved; moreover, the cutting mechanism can reciprocate, and when cutting is carried out, the cutting mechanism can synchronously feed along with materials, so that the continuous combination of the hot melting knife and the cutting knife is realized, the combination time is ensured, and the combination effect is ensured; meanwhile, the angle of the swing plate in the discharging mechanism is adjustable, namely the opening size of the initial end of the channel for feeding materials is adjustable, and after the front bag and the rear bag are separated, the rear bag cannot be introduced into the material guide channel of the discharging mechanism due to lack of guidance when entering the discharging mechanism again.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic view of the combination of the hot melt cutter and the cutting cutter of the present invention;

FIG. 4 is a schematic view of a cutting blade according to the present invention;

FIG. 5 is a schematic view of the structure of the gas guide groove in the material guide channel according to the present invention;

FIG. 6 is a simplified diagram of the positional relationship of various components in one embodiment of the present invention;

FIG. 7 is a simplified diagram of the positional relationship of various components in another embodiment of the present invention;

in fig. 6 and 7 the solid arrows point in the material feed direction and the hollow arrows point in the movement direction of the discharge mechanism;

FIG. 8 is a schematic view of the fusing and cutting positions of the log.

In the figure: 1. raw materials; 101. the bottom of the front bag is sewed; 102. cutting lines; 103. sewing the back bag head; 104. cutting out the area; 2. a feeding mechanism; 201. fixing a material guide channel; 202. a feed roller; 3. a cutting mechanism; 301. a movable material guide channel; 302. a tool holder; 303. a first motor; 304. a second motor; 305. a rack; 306. a first hot-melt knife; 307. cutting knife; 308. a second hot-melting knife; 309. pushing the plate; 4. a discharge mechanism; 401. a swing plate; 402. an arc-shaped guide rail; 403. a carriage; 404. a telescopic rod; 405. and (7) a discharging roller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 8, when the raw material 1 is cut, the front bag bottom seam 101 and the rear bag head seam 103 need to be thermally fused, the position of the cutting line 102 needs to be cut, and the area enclosed in the cutting line 102 is a cutting area 104, and the internal remainder needs to be removed.

Referring to fig. 1-2, the present invention provides a technical solution: a cutting mechanism for producing plastic packaging bags comprises a feeding mechanism 2, a cutting mechanism 3 and a discharging mechanism 4 which are sequentially arranged, wherein a feeding roller 202 capable of pushing materials to feed is arranged in the feeding mechanism 2;

a movable material guide channel 301 capable of reciprocating along the material feeding direction is arranged in the cutting mechanism 3, a hot melting knife and a cutting knife 307 capable of extruding towards the middle surface are arranged in the movable material guide channel 301, the hot melting knife and the cutting knife 307 can start to extrude synchronously or asynchronously, and the extrusion forces of the hot melting knife and the cutting knife 307 can be the same or different;

the two sides of the cutting mechanism 3 are provided with absolutely fixed guide rails, the cutting mechanism 3 and the guide rails are slidably mounted, the trend of the guide rails is consistent with the feeding direction of the raw material 1, a straight rack is arranged in the cutting mechanism 3 along the moving direction, a first motor 303 is fixedly arranged on one side of the guide rails, the end part of the first motor 303 is provided with a gear meshed with the straight rack, and the first motor 303 drives the cutting mechanism 3 to feed forwards or backwards along the guide rails through forward rotation and overturning to realize reciprocating motion.

The discharging mechanism 4 comprises two groups of swinging plates 401 with adjustable included angles, discharging rollers 405 for driving materials to feed are arranged in the swinging plates 401, and when the included angles of the two groups of swinging plates 401 are at the minimum value, the discharging rollers 405 inside are in a rolling state;

when the hot-melt blade operates in synchronization with the cutting blade 307, the hot-melt blade downstream of the cutting blade 307 can be detached earlier than the cutting blade 307.

The feeding mechanism 2 further comprises a fixed material guide channel 201 for materials to pass through, the height of the fixed material guide channel 201 is consistent with that of the movable material guide channel 301, and the feeding rollers 202 are rolling rollers and are distributed on the upper side and the lower side of the fixed material guide channel 201.

The circumferential linear speed of the discharging roller 405 is greater than that of the feeding roller 202;

when the preceding bag contacts with discharge mechanism 4, the bag feeds before inside roller 405 of unloading drives, and feed roll 202 drives the back bag and feeds, both are the drive roll, and be rolling friction between the plastic bag, and be to rolling roll body, consequently there is not sliding friction, when both linear velocities are inconsistent, produces along direction of feed between preceding bag and the back bag and drags the power, consequently preceding bag can be in the disconnection of cutting line 102 department with the back bag.

The discharging mechanism 4 can move obliquely upwards along the arc-shaped track, the bottom of the arc-shaped track is tangent to the feeding direction of the material, and when the discharging mechanism 4 moves upwards along the arc-shaped track, the included angle between the two groups of the inner swinging plates 401 is at the minimum value;

the discharging mechanism 4 further comprises an arc-shaped guide rail 402 fixedly installed, a sliding frame 403 is installed in the arc-shaped guide rail 402 in a sliding mode, one ends of the two groups of oscillating plates 401 are rotatably installed with the sliding frame 403, gear pairs with the transmission ratio of 1 are arranged at rotating shafts of the two groups of oscillating plates 401, stepping motors for driving the rotating plates to rotate are arranged at the rotating shafts of one group of oscillating plates 401, and meanwhile the discharging mechanism 4 further comprises a telescopic rod 404 for driving the sliding frame 403 to slide along the arc-shaped guide rail 402;

in the falling process of the discharging mechanism 4, the included angle of the swinging plates 401 is increased, the lower ends of the arc-shaped guide rails 402 are tangent to the material feeding direction, materials from the movable material guide channels 301 can enter the area between the two groups of swinging plates 401 conveniently, the angle of the swinging plates 401 is reduced, the discharging rollers 405 clamp the materials, the front bag and the rear bag are torn off from the cutting line 102 along with the upward movement of the discharging mechanism 4, the front bag is lifted to a certain height and is thrown after being moved to a designated position under the action of the discharging rollers 405, and the front bag and the rear bag are guaranteed to be highly overlapped, so that the stacking is neat, the conveying belts which move intermittently can be matched at the throwing position, and the transfer after quantitative stacking is realized.

Referring to fig. 3-4, the cutting knife 307 comprises a long knife and a C-shaped curved knife, the long knife and the curved knife enclose a closed trapezoidal space, the length of the long side of the trapezoidal space is shorter than that of the long knife, a push plate 309 capable of pressing down along with the cutting knife 307 is arranged in the trapezoidal space, and the push plate 309 can press down to penetrate through the middle surface of the movable material guide channel 301 in the process of combining and extruding the cutting knife 307;

for the plastic bag with the hand-held part, the top of the plastic bag also needs a hot melting sewing part, and the area between the two hand-held parts needs to be cut off, but most of the waste materials in the prior art cannot be separated from the finished product or are adhered to the finished product; thus increasing the ability to press the pusher plate 309 down over the mid-plane, exerting a force normal to the surface of the material, pushing the trim region 104 away from the material.

The hot melting knife comprises a first hot melting knife 306 and a second hot melting knife 308, the first hot melting knife 306 is positioned at the downstream side of the strip knife, the second hot melting knife 308 is positioned at the upstream side of the strip knife, and the second hot melting knife 308 is in a two-section type and is respectively positioned at two sides of the trapezoidal space;

depending on the orientation of the bag during production, the cutting area 104 may be located on the upstream side or the downstream side of the slitting knife, and the second heat-sealing knife 308 is designed to be two-stage and located on both sides of the cutting area 104 to heat-seal the top carrying portion of the bag.

The upper side and the lower side of the movable material guide channel 301 are respectively provided with a tool rest 302 capable of vertically sliding, the tool rest 302 is internally provided with a vertically arranged rack 305, the racks 305 of the upper tool rest 302 and the lower tool rest 302 are simultaneously meshed with a group of gears and are respectively positioned on the two sides of the gears, and the hot melting knife, the cutting knife 307 and the push plate 309 are respectively connected with the tool rest 302 on the corresponding side through vertically arranged elastic pieces;

set up drive gear pivoted step motor in cutting mechanism 3, this step motor is second motor 304, with cut mechanism 3 relatively fixed, when first second motor 304 drives gear revolve, simultaneously with the rack 305 meshing of both sides, drive the knife rest 302 synchronous motion of both sides, realize inside hot melt sword and cut the extrusion of sword 307 and break away from, and the extruded contact point is in the well face of activity guide passageway 301 all the time, does not influence the whole direction of feed of material.

Referring to fig. 6-7, the lengths of the elastic pieces connected with the knife rest 302 by the first hot-melting knife 306, the cutting knife 307, the second hot-melting knife 308 and the push plate 309 are respectively L1, L2, L3 and L4, L1 is more than L2 and less than or equal to L3 or L1= L3 is more than L2, and L4 is more than or equal to L2;

the elastic elements connected with the knife rest 302 by the first hot-melting knife 306, the cutting knife 307 and the second hot-melting knife 308 have elastic coefficients of K1, K2 and K3 respectively, and K1L 1= K3L 3 is not more than K2L 2;

through the length restriction to different elastic parts, when the tool rest 302 moves, the extrusion and separation sequence of different hot melting knives and cutting knives 307 is realized, and meanwhile, the restriction to the elastic coefficient realizes that the different hot melting knives and cutting knives 307 have different extrusion force capabilities when being completely extruded.

In fig. 6 and 7, the light-colored dotted line part is a material guide channel for allowing the log 1 from upstream to enter the discharging mechanism 4 when the discharging mechanism 4 is at the lowest end and the included angle of the swinging plate 401 is at the maximum; the light-colored solid line part is the state when shedding mechanism 4 is in the highest position, and the finished product after cutting this moment is discharged fast under the effect of roller 405 of unloading, is accepted by follow-up accepting mechanism, guarantees that the finished product has higher overlap degree when being accepted at every turn to guarantee to pile up neatly.

Referring to fig. 6, L1 < L2 < L3, L4 < L2, K1L 1= K3L 3 is not more than K2L 2, when the bag is in operation, the second hot-melting knife 308, the cutting knife 307, and the first hot-melting knife 306 are sequentially combined and extruded, when the bag is separated, the first hot-melting knife 306 is firstly separated, at this time, the unloading mechanism 4 drives the front bag and the rear bag to be separated, at this time, the cutting knife 307 is not separated, the rear bag has a fixing effect, when the front bag is separated from the rear bag, a relatively regular separation line can be formed at the cutting line 102, after the front bag is completely separated from the rear bag, the cutting knife 307 and the second hot-melting knife 308 are sequentially separated, and before the cutting knife 307 is separated, the push plate 309 can be pressed down, excess materials in the cutting area 104 are removed, and similarly, the cutting line 102 is relatively regular due to the fixing effect of the cutting knife 307.

Referring to fig. 7, L1= L3 < L2, L4 < L2, K1L 1= K3L 3 not more than K2L 2, at this time, the first hot-melt blade 306 and the second hot-melt blade 308 are synchronously combined and separated, and both have the same hot-melt time, and the hot-melt effects are consistent.

Referring to fig. 5, the surfaces of the upper wall and the lower wall of a material guide channel for materials to pass through inside the feeding mechanism 2, the cutting mechanism 3 and the discharging mechanism 4 are all provided with air guide grooves, the length direction of the air guide grooves is consistent with the feeding direction of the materials, and the air guide grooves are communicated with an external air source through air guide pipes;

When in use: the continuous raw material 1 of upper reaches gets into feeding mechanism 2 through fixed guide passageway 201, under the effect of feed roll 202, pay-off, get into activity guide passageway 301 afterwards, cut and press down with cutting knife 307 in the mechanism 3 synchronously and combine, and in the bonding process, cut the mechanism 3 and feed along with raw material 1 synchronously, after first hot melt sword 306 breaks away from, before cutting knife 307 breaks away from, unloading mechanism 4 drives the front bag and unloads, separate with the back bag, cut knife 307, hot melt sword complete separation afterwards, cut mechanism 3 and reset fast, carry out next circulation flow, unloading mechanism 4 swing plate 401 drives the finished product and moves to the high position and unload, reset and accept new finished product afterwards, continue the process of the previous flow.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a plastics wrapping bag production is with cutting mechanism, includes feeding mechanism (2) that arrange in proper order, cuts mechanism (3) and shedding mechanism (4), its characterized in that: a feeding roller (202) capable of pushing materials to feed is arranged in the feeding mechanism (2);

a movable material guide channel (301) capable of reciprocating along the material feeding direction is arranged in the cutting mechanism (3), a hot melting knife and a cutting knife (307) capable of extruding towards the middle surface are arranged in the movable material guide channel (301), the hot melting knife and the cutting knife (307) can start to extrude synchronously or asynchronously, and the extrusion forces of the hot melting knife and the cutting knife (307) can be the same or different;

the discharging mechanism (4) comprises two groups of swinging plates (401) with adjustable included angles, discharging rollers (405) for driving materials to feed are arranged in the swinging plates (401), and when the included angles of the two groups of swinging plates (401) are at the minimum value, the discharging rollers (405) in the swinging plates are in a rolling state;

when the hot-melt blade and the cutting blade (307) operate in synchronization, the hot-melt blade downstream of the cutting blade (307) can be detached earlier than the cutting blade (307).

2. The cutting mechanism for producing plastic packaging bags according to claim 1, characterized in that: the circumferential linear speed of the discharging roller (405) is greater than that of the feeding roller (202).

3. The cutting mechanism for producing plastic packaging bags according to claim 1, characterized in that: the discharging mechanism (4) can move upwards along the arc-shaped track, the bottom of the arc-shaped track is tangent to the feeding direction of the materials, and when the discharging mechanism (4) moves upwards along the arc-shaped track, the included angle between the two groups of inner swinging plates (401) is at the minimum value.

4. The cutting mechanism for producing plastic packages according to any one of claims 1-3, characterized in that: cut sword (307) including the curved knife of rectangular sword and C shape, rectangular sword and curved knife enclose into confined trapezoidal space, the long limit length in trapezoidal space is shorter than the length of rectangular sword, be provided with push pedal (309) that can push down along with cutting sword (307) in the trapezoidal space, cutting sword (307) and combining extruded in-process, push pedal (309) can push down the well face of passing activity guide passageway (301).

5. The cutting mechanism for producing plastic packaging bags according to claim 4, characterized in that: the hot melting knife comprises a first hot melting knife (306) and a second hot melting knife (308), the first hot melting knife (306) is located on the downstream side of the long strip knife, the second hot melting knife (308) is located on the upstream side of the long strip knife, and the second hot melting knife (308) is in a two-section type and is located on two sides of the trapezoidal space.

6. The cutting mechanism for producing plastic packaging bags according to claim 5, characterized in that: the upper side and the lower side of the movable material guide channel (301) are respectively provided with a tool rest (302) capable of vertically sliding, a rack (305) vertically arranged is arranged in the tool rest (302), the racks (305) of the upper tool rest and the lower tool rest (302) are simultaneously meshed with a set of gears and are respectively positioned on two sides of the gears, and the hot melting knife, the cutting knife (307) and the push plate (309) are respectively connected with the tool rest (302) on the corresponding side through vertically arranged elastic pieces.

7. The cutting mechanism for producing plastic packaging bags according to claim 6, characterized in that: the lengths of the elastic pieces connected with the knife rest (302) by the first hot melting knife (306), the cutting knife (307), the second hot melting knife (308) and the push plate (309) are respectively L1, L2, L3 and L4, L1 is more than L2 and less than or equal to L3 or L1= L3 and less than L2, and L4 is more than or equal to L2;

the elastic elements connected with the knife rest (302) by the first hot melting knife (306), the cutting knife (307) and the second hot melting knife (308) respectively have elastic coefficients of K1, K2 and K3, and K1L 1= K3L 3 is not more than K2L 2.

8. The cutting mechanism for producing plastic packaging bags according to claim 6, characterized in that: the feeding mechanism (2), the cutting mechanism (3) and the discharging mechanism (4) are internally provided with air guide grooves on the upper wall and the lower wall of a guide channel for materials to pass through, the length direction of the air guide grooves is consistent with the feeding direction of the materials, and the air guide grooves are communicated with an external air source through air guide pipes.