CN117485680A - Packaging heat sealing device of envelope type packaging machine - Google Patents

Abstract

The application relates to the field of packaging equipment, especially relates to a packaging heat sealing device of envelope type packaging machine, include: the machine case is provided with a material conveying path for conveying the packaging film after wrapping the material on one side; the heat-sealing upper pressing plate is vertically and movably arranged above the material conveying path; the second cross beam is vertically and movably arranged below the material conveying path; the heat-sealing lower pressing plate is vertically arranged on the second cross beam and can swing relative to the second cross beam; the heat-sealing lower pressing plate can synchronously rise along with the rising of the second cross beam and is matched with the vertically-falling heat-sealing upper pressing plate to finish the heat sealing of the folded edges of the packaging film after wrapping the materials; after the heat sealing upper pressing plate rises after heat sealing is finished, the heat sealing lower pressing plate swings to fold the folded edges of the heat sealed packaging film and heat-seal the folded edges of the heat sealed packaging film on the peripheral surface of the packaging film. The back sealing operation method has the advantages that the back sealing operation after the single-side wrapping of the materials can be achieved.

Description

Packaging heat sealing device of envelope type packaging machine

Technical Field

The application relates to the field of packaging equipment, in particular to a packaging heat sealing device of an envelope type packaging machine.

Background

The automatic packaging equipment is equipment for replacing manual work to automatically package materials. Packaging devices are widely used in a variety of industries, of which the use is most prominent, especially in the food industry.

The related art discloses an envelope type packaging mode, which is mainly used for packaging cylindrical materials, and referring to fig. 1, the steps are as follows: firstly, abutting the material on one side of the packaging film, then attaching the upper side and the lower side of the packaging film towards the material along the circumferential track of the material, folding the upper side and the lower side of the packaging film for back sealing after the single-side packaging of the material is realized, and then folding and heat-sealing the two ends of the packaging film, so that the final packaging of the material is achieved.

However, in this process, when the packaging film is back sealed after the packaging of the material is completed, no packaging device can be automatically implemented, and therefore, it is highly desirable to provide a device capable of implementing back sealing of the envelope type packaging.

Disclosure of Invention

In order to realize the back sealing operation after the single-side wrapping of the materials, the application provides a packaging heat sealing device of an envelope type packaging machine.

The application provides a package heat sealing device of envelope type packagine machine adopts following technical scheme:

A packaging heat-sealing device of an envelope type packaging machine, comprising:

the machine case is provided with a material conveying path for conveying the packaging film after wrapping the material on one side;

the heat-sealing upper pressing plate is vertically and movably arranged above the material conveying path;

the second cross beam is vertically and movably arranged below the material conveying path;

the heat-sealing lower pressing plate is vertically arranged on the second cross beam and can swing relative to the second cross beam;

the heat-sealing lower pressing plate can synchronously rise along with the rising of the second cross beam and is matched with the vertically-falling heat-sealing upper pressing plate to finish the heat sealing of the folded edges of the packaging film after wrapping the materials;

after the heat sealing upper pressing plate rises after heat sealing is finished, the heat sealing lower pressing plate swings to fold the folded edges of the heat sealed packaging film and heat-seal the folded edges of the heat sealed packaging film on the peripheral surface of the packaging film.

Through adopting above-mentioned technical scheme, when the packaging film that the parcel has the material is sent to the position of upper heat seal board and lower heat seal board, at first heat seal top board upward movement, heat seal holding down plate downward movement is located the packaging film back hem between heat seal top board and the heat seal holding down plate and is pressed the heat seal, after the heat seal is accomplished, the heat seal top board promotes and breaks away from the packaging film, and the packaging film back hem part after the heat seal holding down plate promotes the part promotion that the packaging film package material tends to, the back hem after the messenger packaging film heat seal laminates the position department of packaging film package material, and carry out hot pressing through the heat seal holding down plate, can accomplish the complete heat seal operation of packaging film back hem.

Optionally, the method further comprises:

the first sliding shaft is vertically and movably arranged at one side of the chassis corresponding to the conveying path, and the heat-sealing lower pressing plate is fixedly arranged at the upper end of the first sliding shaft;

the first pushing spring is arranged on one side of the case and used for pushing the first sliding shaft to move vertically downwards;

the first swing arm is arranged on one side of the chassis in a swinging way, and can swing to push the first sliding shaft to rise;

the first cam is rotationally arranged on one side of the case;

the first rocker is rotationally arranged on one side of the case, and one end of the first rocker is abutted against the first cam and swings back and forth along with the rotation of the first cam;

the first pull rod is movably connected between the first rocker and the first swing arm.

By adopting the technical scheme: the first spring promotes the vertical downward motion of first sliding shaft, drive the trend that the heat seal top board kept the downward motion through first crossbeam, simultaneously, the trend that the sliding shaft moved down drives first swing arm and keeps the trend of downward swing, also can pull through the second swing and hold the second pull rod, so that first rocker keeps contradicting with first cam, and rotate along with first cam, can promote the reciprocal swing of first rocker, thereby drive the swing of second swing arm through first connecting rod, thereby drive two reciprocal swings of first swing arm, and then drive two sliding shafts through two first connecting pieces vertical motion, in order to realize the vertical motion of heat seal top board, in order to realize the upside heat-seal of packaging film hem.

Optionally, the method further comprises:

the first sliding block is vertically and movably arranged at one side of the chassis corresponding to the conveying path, and the second cross beam is fixed on the first sliding block;

the third swing arm is rotationally arranged on the side wall of the case, one end of the third swing arm is connected with the first sliding block, and the first sliding block can be pushed to move along with the swing of the third swing arm;

the third cam is rotatably arranged on the case;

the third rocker is rotatably arranged on the chassis, and one end of the third rocker is abutted against the third cam and swings back and forth along with the rotation of the third cam;

and the third pull rod is movably connected between the third rocker and the third swing arm.

Through adopting above-mentioned technical scheme, the third cam rotates, drives the swing of third rocker, pulls third swing arm swing through the third pull rod, drives the vertical motion of first slider to can drive the second crossbeam and rise, realize the vertical motion of heat-seal holding down plate, so that realize the downside heat-seal of packaging film hem.

Optionally, the method further comprises:

the third tension spring is fixed between the case and the third swing arm and used for pulling and holding one end, connected with the third swing arm and the third pull rod, of the third swing arm to move downwards, so that the third pull rod can push the third rocker to always prop against the third cam.

Through adopting above-mentioned technical scheme, the third extension spring can pull and hold the one end that third swing arm and third pull rod are connected and move downwards earlier to make the vertical downward pressure that applys of first pull rod, promote the third rocker and deviate from third cam one end and keep decurrent trend, and then make the one end that the third rocker is close to the third cam conflict in the third cam all the time.

Optionally, the method further comprises:

the second cam is rotationally connected with the case;

the second rocker is rotationally connected with the chassis, and one end of the second rocker is abutted against the second cam and can swing back and forth along with the rotation of the second cam;

and one end of the second pull rod is movably connected with the second rocker, and the other end of the second pull rod is movably connected with the heat-sealing lower pressing plate.

Through adopting above-mentioned technical scheme, rotate along with the second cam, can promote the second rocker trend second crossbeam direction swing to promote the heat-seal holding down plate through the second pull rod, make the heat-seal holding down plate press and promote packaging film hem pressure to hold in packaging film global.

Optionally, the method further comprises:

the second tension spring is connected between the case and the second rocking bar and used for pulling the second rocking bar so as to enable the second rocking bar to prop against the second cam.

Through adopting above-mentioned technical scheme, the second extension spring that adopts can keep the second rocker to contradict in the second cam all the time to guarantee the normal operation of second cam.

Optionally, the method further comprises:

the two first brackets are symmetrically arranged at two sides of the material conveying path along the reciprocating motion of the material conveying direction and are positioned between the heat-seal upper pressing plate and the heat-seal lower pressing plate operation area;

the two inserting angles are respectively fixed on opposite sides of the two first brackets and move along with the two first brackets, and can be abutted against two ends of the packaging film wrapped with the materials, so that the packaging film forms a first folding angle.

Through adopting above-mentioned technical scheme, when the packaging film that the parcel has the material is sent to between heat-seal top board and the heat-seal holding down plate operation region, two supports trend the packaging film direction motion that the parcel has the material, can realize inserting the both ends of establishing the packaging film through two inserted angles to can make the both ends of packaging film form the dog-ear.

Optionally, the method further comprises:

the floating seat is arranged on the machine case in a reciprocating manner along the conveying direction of the materials, and the two brackets are fixed on the floating seat;

the fourth swing arm is hinged to the case and used for driving the floating seat, and can swing along with the fourth swing arm to drive the floating seat to reciprocate;

the fourth cam is continuously and rotatably arranged on the chassis;

the first rocker arm is rotatably arranged on the chassis, one end of the first rocker arm is matched with the fourth cam, and the first rocker arm can swing back and forth along with the rotation of the fourth cam;

The spring telescopic rod is movably connected between the first rocker arm and the fourth rocker arm and is used for driving the fourth rocker arm to synchronously swing along with the first rocker arm.

Through adopting above-mentioned technical scheme, when the packaging film that the parcel has the material is sent to between heat-seal top board and the heat-seal holding down plate operation region, the fourth cam rotates, drives first rocking arm swing, then can drive the swing of fourth swing arm through the spring telescopic link, and the swing of two fourth swing arms can the floating seat reciprocating motion to drive two supports and trend the packaging film direction motion that the parcel has the material, insert the both ends of establishing the packaging film through two inserted angle realization, thereby can make the both ends of packaging film form the dog-ear.

Optionally, the method further comprises:

the two corner forming dies are arranged at two sides of the material conveying path and are used for carrying out complete corner folding on the packaging film after the first corner folding;

the two heating plates are arranged on two sides of the material conveying path in a relatively moving manner, and the two heating plates are relatively moved, so that the two ends of the packaging film wrapped with the material after the complete folding angle can be abutted and heat-sealed.

Through adopting above-mentioned technical scheme, the packaging film that parcel has the material after the first dog-ear will get into two dog-ear forming die and realize the complete dog-ear at the packaging film both ends that parcel has the material, and when the packaging film both ends that parcel has the material send to between the two hot plates from two dog-ear forming die after the complete dog-ear, the hot plate relative motion contradicts the both ends of the packaging film that parcel has the material, can realize the heat-seal at packaging film both ends dog-ear, after the heat-seal, two push cylinders drive two hot plates reset, with the material send out can, up to this point, can accomplish the packaging film to the complete parcel of material.

Optionally, the method further comprises:

the swing crank is horizontally and rotatably arranged at one side of the feed end of the folding angle forming die;

the clamping finger is fixed on one side of the swing crank corresponding to the feed end of the folding angle forming die;

the pushing spring is positioned at one side of the feeding end of the folding angle forming die and is used for pushing the swing crank so that the clamping finger can keep the end of the packaging film which is arranged at the front side of the folding angle forming die and wraps the material to be supported;

the two opening and closing cranks reciprocate on the front side of the folding angle forming die along the material conveying path, and the opening and closing cranks can push the two swinging cranks to swing so that the clamping fingers swing in the direction away from the end part of the packaging film wrapped with the material.

Through adopting above-mentioned technical scheme, when opening and shutting the crank trend angle forming die direction motion, two crank that open and shut will conflict in the swing crank to promote swing crank swing, thereby drive the clamp and indicate the swing, so that the packaging film of parcel have the material is sent to the angle forming die front side, and when the crank that opens and shuts deviates from angle forming die direction motion, the crank that opens and shuts will break away from gradually swing crank, the promotion spring will promote swing crank swing this moment, thereby drive the clamp and indicate the tip of contradicting in the packaging film of parcel have the material, realize the support to the material.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the packaging film wrapped with materials is sent to the positions of the upper heat sealing plate and the lower heat sealing plate, firstly the heat sealing upper pressing plate moves upwards, the heat sealing lower pressing plate moves downwards, the back edge of the packaging film located between the heat sealing upper pressing plate and the heat sealing lower pressing plate is subjected to pressing heat sealing, after heat sealing is completed, the heat sealing upper pressing plate is lifted to be separated from the packaging film, the heat sealing lower pressing plate pushes the part of the back edge of the packaging film after heat sealing to push the part of the packaging film, which tends to the packaging material, of the packaging film, so that the back edge of the packaging film after heat sealing is attached to the position of the packaging material of the packaging film, and the heat sealing operation of the back edge of the packaging film can be completed through heat sealing of the lower pressing plate.

2. When the packaging film wrapped with materials is sent to a position between the heat-sealing upper pressing plate and the heat-sealing lower pressing plate operation area, the fourth cam rotates to drive the first rocker arm to swing, then the spring telescopic rod can drive the fourth rocker arm to swing, and the floating seat can reciprocate through the swing of the two fourth rocker arms, so that the two supports are driven to move towards the direction of the packaging film wrapped with the materials, the two ends of the packaging film are inserted through the two insertion angles, and the two ends of the packaging film can form a folding angle.

3. The packaging film wrapped with the materials after the first folding angle enters the two folding angle forming die to realize complete folding angles of the two ends of the packaging film wrapped with the materials, and when the two ends of the packaging film wrapped with the materials are completely folded and then sent between the two heating plates from the two folding angle forming die, the two ends of the packaging film wrapped with the materials are in conflict with each other by the relative movement of the heating plates, so that the heat sealing of the folding angles of the two ends of the packaging film can be realized, and after the heat sealing, the two pushing cylinders drive the two heating plates to reset, so that the materials are sent out, and the packaging film can completely wrap the materials.

Drawings

FIG. 1 is a schematic view of a packaging process of a related art packaging film;

fig. 2 is an overall schematic view of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

fig. 3 is a schematic structural view of an upper heat-sealing module of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

fig. 4 is a schematic structural view of a lower heat-seal module of a packaging heat-seal device of an envelope type packaging machine according to an embodiment of the present application;

fig. 5 is an exploded view showing the structure of a lower heat-seal module of a packaging heat-seal device of an envelope type packaging machine according to an embodiment of the present application;

fig. 6 is a schematic structural view of a first corner module of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

Fig. 7 is an exploded view showing the structure of a first corner module of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

fig. 8 is a schematic structural view of a second corner mold of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

fig. 9 is an exploded view showing the structure of a second corner mold of a packaging heat-sealing device of an envelope type packaging machine according to an embodiment of the present application;

fig. 10 is an exploded schematic view of a corner heat seal module of a package heat seal device of an envelope type packaging machine according to an embodiment of the present application.

Reference numerals illustrate:

1. a chassis; 11. a support shaft; 12. a drag hook; 15. a linear guide rail;

2. a heat sealing module; 21. a first slide shaft; 211. a retainer ring; 212. a first spring; 213. a first connection block; 214. a first notch; 22. a fixed block; 221. a guide rod; 23. a first cross beam; 231. heat-sealing an upper pressing plate; 24. a first cam; 241. a first rocker; 25. a first linkage shaft; 251. a first swing arm; 252. a first strut; 26. a second swing arm; 27. a first pull rod;

3. a lower heat sealing module; 31. a first slider; 311. a second notch; 32. a second cross beam; 321. a mounting base; 33. a swing beam; 331. heat-sealing the lower pressing plate; 332. a collision block; 34. a second rocker; 341. a second tension spring; 35. a second pull rod; 36. a third cam; 371. a third rocker; 38. a second linkage shaft; 381. a third swing arm; 382. a second strut; 39. a third pull rod; 391. a third tension spring;

4. A first corner module; 41. a fourth cam; 411. cam grooves; 42. a first rocker arm; 421. an adjustment tank; 43. a third coupling shaft; 431. a fourth swing arm; 44. a spring telescoping rod; 441. an adjusting column; 45. a slide; 451. a third notch; 46. a floating seat; 461. a support; 47. a bracket; 471. inserting an angle; 48. an opening and closing crank;

5. a second bevel module; 51. a vertical plate; 511. a base; 52. a shaping plate; 521. a first lower shaping plate; 522. a forming plate is arranged; 523. a second lower shaping plate; 53. a pressing plate; 531. a fixing frame; 54. an upper base plate; 55. a lower base plate; 56. clamping blocks; 57. a swing crank; 58. a clamping finger; 59. a pushing spring;

6. a bevel heat sealing module; 61. pushing a cylinder; 62. a housing; 63. a support plate; 64. a heating plate; 65. and the heat insulation plate.

Detailed Description

The present application is described in further detail below in conjunction with fig. 2-10.

The embodiment of the application discloses a packaging heat sealing device of an envelope type packaging machine.

Referring to fig. 2, a packaging heat-sealing device of an envelope type packaging machine includes a casing 1, a back sealing unit, and a side sealing unit.

Wherein, the whole chassis 1 is in a long rectangular box-shaped structure. Its length direction one end is the feed end, and its length direction's the other end is the discharge end, and the upper surface of quick-witted case 1 is the working face, and working face width direction middle part forms the material delivery path, and the conveying part of material can support the push-type, and quick-witted case 1 the place ahead sets up the pushing part promptly, promotes the feeding ejection of compact with the material in proper order, also can adopt continuous conveying formula, and quick-witted case 1 upper surface corresponds material conveying part and sets up parts such as delivery track, conveyer belt promptly, realizes the continuous conveying of material. Namely, the continuous pushing of the materials can be realized, and the description is not repeated here in the embodiment

Further, for convenience of the following description, the vertical side of the chassis 1 is designated as the a side, and a vertical side opposite to the a side is designated as the B side.

A main shaft (not shown in the figure) is arranged in the case 1 along the width direction of the main shaft, two ends of the main shaft are rotatably connected to the case 1, a driving motor is fixed at one end, close to the discharging end, of the case 1, of the main shaft, and the driving motor drives the main shaft to rotate through a synchronous transmission mechanism.

The back sealing unit comprises an upper heat sealing module 2 and a lower heat sealing module 3 which are respectively used for driving the upper heat sealing knife and the lower heat sealing knife to move.

Referring to fig. 3, the upper heat sealing module 2 includes two vertically disposed first sliding shafts 21, the two first sliding shafts 21 are respectively arranged at two sides of A, B of the chassis 1, two sides of A, B of the chassis 1 are also fixed with fixing blocks 22, the two first sliding shafts 21 are respectively vertically slid on the two fixing blocks 22, and lower ends of the two first sliding shafts 21 are respectively extended out of lower sides of the two fixing blocks 22. The lower end of the first sliding shaft 21 is also fixed with a retainer ring 211, and the first sliding shaft 21 is sleeved with a first spring 212, one end of the first spring 212 is abutted against the lower side of the fixed block 22, and the other end is abutted against the upper side of the retainer ring 211. Normally, the first spring 212 can drive the two sliding shafts to move downwards by pushing the retainer ring 211.

A first cross beam 23 is fixed between the upper ends of the two first slide shafts 21, the first cross beam 23 is horizontally arranged, and the length direction of the first cross beam 23 is perpendicular to the conveying direction of the packaging film. A heat-seal upper pressing plate 231 is vertically fixed on the first cross beam 23, and the length direction of the heat-seal upper pressing plate 231 is the same as the length direction of the first cross beam 23. The two slide shafts move vertically, and the heat-seal upper pressing plate 231 is driven to move downwards by the first cross beam 23.

The upper heat sealing module 2 further comprises a first cam 24, the first cam 24 is arranged on the side A of the case 1, the first cam 24 is fixed at one end of the main shaft, and the first cam 24 can be driven to synchronously rotate along with the rotation of the main shaft. The chassis 1 is provided with a first rocker 241 corresponding to the horizontal side of the cam, the first rocker 241 is vertically arranged, the middle of the first rocker 241 is hinged to the chassis 1, and the lower end of the first rocker 241 is abutted against the peripheral surface of the first cam 24. In order to reduce the friction between the first rocker 241 and the outer edge of the first cam 24, a rotation interference member such as a roller may be further disposed at an end of the first rocker 241 interfering with the first cam 24, so as to reduce the friction between the first rocker 241 and the first cam 24.

The first linkage shaft 25 is further rotatably connected in the case 1, the axial direction of the first linkage shaft 25 is perpendicular to the conveying direction of the packaging film, two ends of the first linkage shaft 25 protrude out of two sides A, B of the case 1 respectively, two sides A, B of the case 1 are provided with the first swing arms 251, the two first swing arms 251 are horizontally arranged, and one ends of the first swing arms 251 are fixedly connected with the first linkage shaft 25.

The first connecting blocks 213 are fixed on the upper sides of the two first sliding shafts 21 corresponding to the fixed blocks 22, and the first connecting blocks 213 can synchronously move along with the first sliding shafts 21. The first connecting block 213 is provided with a first notch 214 along the horizontal direction, one end of the first swing arm 251, which is away from the first linkage shaft 25, is provided with a first slide column 252, the first slide column 252 is inserted into the first notch 214 and can move along with the opening direction of the first notch 214, the first swing arm 251 swings, and the first swing arm 252 moves in the first notch 214 to push the first connecting block 213 to move vertically so as to drive the slide shaft to move vertically.

In order to ensure the running stability of the first connecting block 213, a guide bar 221 is vertically fixed to the fixed block 22 corresponding to the sliding shaft, and the first connecting block 213 slides on the guide bar 221.

The side A of the chassis 1 is further provided with a second swing arm 26, one end of the second swing arm 26 is fixed with the first linkage shaft 25, a first pull rod 27 is arranged between the other end of the second swing arm 26 and one end of the first rocker 241, which is away from the first cam 24, one end of the first pull rod 27 is hinged to the first swing arm 251, and the other end of the first pull rod 27 is hinged to the first rocker 241.

The whole operation process of the upper heat sealing module 2 is as follows: the first spring 212 pushes the first sliding shaft 21 to vertically move downwards, the first cross beam 23 drives the heat sealing upper pressing plate 231 to keep the downward movement trend, meanwhile, the sliding shaft downward movement trend drives the first swinging arm 251 to keep the downward swinging trend, the second pull rod 35 can be pulled and held through the second swinging, so that the first rocking rod 241 keeps abutting against the first cam 24 and rotates along with the first cam 24, the first rocking rod 241 can be pushed to swing reciprocally, the first connecting rod drives the second swinging arm 26 to swing reciprocally, the two first swinging arms 251 are driven to swing reciprocally, and the two first connecting blocks 213 drive the two sliding shafts to vertically move, so that the heat sealing upper pressing plate 231 is vertically moved.

Referring to fig. 4 and 5, the lower heat sealing module 3 includes two vertically disposed first sliders 31, the two first sliders 31 vertically slide on the first sliding shaft 21, a second cross beam 32 is fixed between the two first sliders 31, and a length direction of the second cross beam 32 is the same as a length direction of the first cross beam 23. Both ends of the second cross beam 32 are fixed with mounting seats 321, and the mounting seats 321 are positioned at one end of the second cross beam 32 close to the feeding end of the chassis 1. A swinging beam 33 is arranged between the two mounting seats 321, two ends of the swinging beam 33 are both rotationally connected with the mounting seats 321, a heat-sealing lower pressing plate 331 is fixed on the swinging beam 33, and the length direction of the heat-sealing lower pressing plate 331 is the same as the length direction of the second cross beam 32.

The side of the swinging beam 33, which is close to the second cross beam 32, is vertically fixed with a collision block 332, the collision block 332 swings to drive the heat seal lower pressure plate 331 to swing through the swinging beam 33, and the collision block 332 swings to enable the collision block 332 to deviate from the side of the swinging beam 33 to collide with the second cross beam 32.

The supporting shaft 11 is fixed to one side, facing away from the swinging beam 33, of the second cross beam 32 in the chassis 1, the length direction of the supporting shaft 11 is identical to that of the second cross beam 32, a second rocker 34 is arranged on one side, facing away from the abutting block 332, of the second cross beam 32, the upper end of the second rocker 34 is rotatably connected to the supporting shaft 11, a second pull rod 35 is arranged between the second rocker 34 and the abutting block 332, and two ends of the second pull rod 35 are respectively hinged to the second rocker 34 and the abutting block 332. One side of the chassis 1, which corresponds to the supporting shaft 11 and is away from the second cross beam 32, is also fixed with a draw hook 12, a second tension spring 341 is fixedly connected between the draw hook 12 and the second rocking bar 34, and the second tension spring 341 can pull and hold the second rocking bar 34 to swing away from the second cross beam 32, so that the second tension rod 35 pulls and holds the abutting block 332 to swing until abutting against the second cross beam 32.

The spindle is further fixed with a second cam (shown in the figure) at a position in the chassis 1, the lower end of the second rocker 34 abuts against the outer edge of the second cam 36, and rotates along with the second cam 36 to push the second rocker 34 to swing towards the second cross beam 32, so that the second pull rod 35 pushes the abutting block 332 to enable the upper side of the heat seal lower pressing plate 331 to swing towards the second cross beam 32.

The side a of the chassis 1 is further provided with a third cam 36, and the third cam 36 is fixed at one end of the main shaft, and can drive the third cam 36 to synchronously rotate along with the rotation of the main shaft. The chassis 1 is provided with a third rocker 37 corresponding to the lower side of the third cam 36, the length direction of the third rocker 37 is along the material conveying direction, the middle part of the length direction of the third rocker 37 is hinged to the chassis 1, and one end of the third rocker 37 is abutted to the lower side of the outer edge of the third cam 36. To reduce friction between the third rocker 37 and the outer edge of the third cam 36, a rotation interference member such as a roller may be disposed at an end of the third rocker 37 interfering with the third cam 36, for reducing friction with the third cam 36.

The upper side of the case 1 is also rotated with a second linkage shaft 38, the axial direction of the second linkage shaft 38 is the same as the axial direction of the first linkage shaft 25, and two ends of the second linkage shaft 38 protrude from two sides of A, B of the case 1 respectively. The second linkage shaft 38 is fixed with a third swing arm 381 at both ends, and the length direction of the third swing arm 381 is also set along the conveying direction of the material. The second slide column 382 is fixed at one end of the two third swing arms 381 facing the feeding direction of the chassis 1, the second gap 311 is horizontally formed at one side of the two first slide blocks 31 deviating from the third swing arms 381, the second slide column 382 is inserted into the second gap 311 and can move along with the direction of the second gap 311, the third swing arms 381 swing, and the first slide blocks 31 can be pushed to move vertically through the movement of the second slide columns 382 in the second gap 311 so as to drive the second cross beam 32 to move vertically.

A third pull rod 39 is vertically provided between an end of the third rocker 37 facing away from the third cam 36 and an end of the third swing arm 381 facing away from the third cam 36. The lower end of the third pull rod 39 is hinged to the third rocker 37, and the upper end of the third pull rod 39 is hinged to the third swing arm 381 on the chassis 1A side. One end of the third swing arm 381, which is away from the first slider 31 and hinged to the third pull rod 39, is also fixed with a third tension spring 391, and the other end of the third tension spring 391 is fixed to the bottom of the chassis 1.

Normally, the third tension spring 391 can pull and hold the hinged end of the third swing arm 381 and the third pull rod 39 to move downward, so that the first pull rod 27 applies pressure vertically downward to push the end of the third rocker 37 away from the third cam 36 to keep downward trend, and further, the end of the third rocker 37 close to the third cam 36 always abuts against the third cam 36. When the third cam 36 rotates, the third rocker 37 swings by abutting against one end of the third cam 36, and drives the third pull rod 39 to move up and down, so as to synchronously drive the third swing arm 381 to swing.

The whole operation process of the lower heat sealing module 3 is as follows: the third cam 36 rotates to drive the third rocker 37 to swing, the third rocker 381 is pulled to swing through the third pull rod 39 to drive the first slider 31 to vertically move, so that the second cross beam 32 can be driven to rise to realize the vertical movement of the heat sealing lower pressure plate 331, in the process, the second pull rod 341 pulls the second rocker 34 and can always pull the abutting block 332 through the second pull rod 35 to keep the swinging beam 33 stationary relative to the second cross beam 32, but when the second cam 36 rotates to drive the second swing rod to swing through the cooperation of the second pull rod 341, the second pull rod 35 can drive the abutting block 332 to swing along with the swinging of the second swing rod to realize the swinging of the heat sealing lower pressure plate 331.

When the packaging film wrapped with materials is sent to the heat sealing area of the case 1 during heat sealing operation, firstly the heat sealing upper pressing plate 231 moves upwards, the heat sealing lower pressing plate 331 moves downwards, the back edge of the packaging film located between the heat sealing upper pressing plate 231 and the heat sealing lower pressing plate 331 is subjected to pressing heat sealing, after heat sealing is completed, the heat sealing upper pressing plate 231 is lifted to be separated from the packaging film, the heat sealing lower pressing plate 331 pushes the back edge folding part of the packaging film after heat sealing to push the part of the packaging film, which tends to the packaging material, of the packaging film, so that the back edge folding part of the packaging film after heat sealing is attached to the position of the packaging material of the packaging film, and the complete heat sealing operation of the back edge folding of the packaging film can be completed through heat sealing lower pressing plate 331.

The side seal unit comprises a first corner module 4, a second corner module 5 and a corner heat seal module 6. The first corner module 4 and the second corner module 5 are used for realizing the corner folding of two ends of the packaging film with the materials packaged, and the corner heat sealing module 6 is used for realizing the corner heat sealing of two ends of the packaging film after corner folding.

Referring to fig. 6 and 7, specifically, the first corner module 4 includes a fourth cam 41 disposed on the chassis 1B side, and the fourth cam 41 is coaxially fixed to one end of the spindle, that is, the spindle rotates, so as to drive the fourth cam 41 to rotate synchronously. The side B of the case 1 is also provided with a first rocker arm 42, the whole first rocker arm 42 is V-shaped, and the V-shaped intersection point of the first rocker arm 42 is rotationally connected to the side B of the case 1; the side surface of the fourth cam 41 is formed with a cam groove 411, and one end of the first rocker arm 42 is fitted into the cam groove 411, and the first rocker arm 42 can rotate around its hinge point with the chassis 1 as the fourth cam 41 rotates.

In order to reduce the friction between the first rocker arm 42 and the cam groove 411, the end of the first rocker arm 42 that fits into the cam groove 411 may be further provided with a rotation interference member such as a roller for reducing the friction of the first rocker arm 42 with the cam groove 411.

The chassis 1 is further rotatably connected with a third coupling shaft 43, the third coupling shaft 43 is disposed along the width direction of the chassis 1, and two ends of the third coupling shaft 43 protrude from the a side and the B side of the chassis 1 respectively. The side a and the side B of the chassis 1 are symmetrically provided with a fourth swing arm 431, and one end of the fourth swing arm 431 is fixed on the third driving shaft 43, that is, the third driving shaft 43 rotates, so that the two fourth swing arms 431 can be driven to swing synchronously.

An adjusting groove 421 is formed at one end of the first rocker arm 42, which is away from the fourth cam 41, along the extending direction of the first rocker arm, and a spring telescopic rod 44 is arranged between the first rocker arm 42 and the fourth rocker arm 431; an adjusting column 441 is fixed to one end of the spring telescoping rod 44, and the adjusting shaft is inserted into the adjusting groove 421 and is locked in the adjusting groove 421 by a screw bolt. The other end of the spring telescopic rod 44 is hinged to the middle part of the fourth swing arm 431 in the length direction, namely, the fourth cam 41 rotates to drive the first swing arm 42 to swing, and the spring telescopic rod 44 can be driven to swing through the adaptation of the adjusting groove 421 and the adjusting column 441, so that the two fourth swing arms 431 are pushed to swing.

The side A and the side B of the case 1 are also both fixed with linear guide rails 13 along the length direction of the case 1, the linear guide rails 13 are positioned on one side of the back sealing unit close to the discharging of the case 1, sliding seats 45 are respectively slipped on the two linear guide rails 13, third gaps 451 are respectively formed on the upper sides of the two sliding seats 45, third sliding columns are respectively hinged to one ends of the two fourth swing arms 431, which deviate from the third movable shaft 43, and the third sliding columns are inserted into the third gaps 451 and are matched with the sliding seats 45. Along with the swinging of the two fourth swinging arms 431, the two sliding bases 45 can be driven to slide back and forth along the linear guide rail 13 through the matching of the third sliding column and the third notch 451.

A floating seat 46 is arranged between the two sliding seats 45, the floating seat 46 is arranged along the width direction of the chassis 1, two ends of the floating seat 46 extend to two sides of A, B of the chassis 1 respectively and are fixed on the two sliding seats 45, and two ends of the upper surface of the floating seat 46 in the length direction are also fixed with supporting seats 461. The upper surface of the case 1 is provided with a relief groove corresponding to the position of the support 461, and the upper ends of the two supports 461 penetrate through the relief groove and extend to the upper surface of the case 1. The two brackets 47 are symmetrically arranged on the two brackets 47, and the insertion angles 471 are fixed on the similar ends of the two brackets 47.

In summary, the operation process of the first bevel module 4 is as follows: when the packaging film wrapped with the materials is sent to the back sealing area, the fourth cam 41 rotates to drive the first rocker arm 42 to swing, then the spring telescopic rod 44 can drive the fourth rocker arm 431 to swing, the two sliding seats 45 can be driven to slide along the two linear guide rails 13 through the swing of the two fourth rocker arms 431, the floating seat 46 drives the two supporting seats 461 to move, the two supporting seats 47 can tend to move in the direction of the packaging film wrapped with the materials, the two ends of the packaging film are inserted through the two inserting angles 471, and accordingly the two ends of the packaging film can form folding angles.

Referring to fig. 8 and 9, the second corner module 5 is located at one side of the first corner module 4 near the discharging side of the chassis 1, and the second corner module 5 includes two corner forming dies symmetrically disposed at two sides of the chassis 1 along the length direction of the chassis 1.

The two corner forming dies comprise vertical plates 51, the two vertical plates 51 are vertically arranged on two sides of the upper surface of the chassis 1 along the length direction of the chassis 1, bases 511 are screwed on the deviating sides of the two vertical plates 51, and each base 511 is screwed on the chassis 1, so that the vertical plates 51 are fixed on the upper surface of the chassis 1.

The shaping plates 52 are disposed on the adjacent sides of the two vertical plates 51, and specifically, the shaping plates 52 include a first lower shaping plate 521, an upper shaping plate 522, and a second lower shaping plate 523 vertically disposed in this order along the feeding direction, and the first lower shaping plate 521, the upper shaping plate 522, and the second lower shaping plate 523 are respectively fixed to the vertical plates 51 by horizontally disposed pillars.

The lower side of the upper forming plate 522 is formed into two first inclined edges, the two first inclined edges are connected at the middle position of the upper forming plate 522 in the length direction, and the deviating ends of the two first inclined edges extend upwards in an inclined manner to the two ends of the upper forming plate 522. The height of the first lower shaping plate 521 is lower than that of the second lower shaping plate 523, the second inclined edges are shaped on the sides of the first lower shaping plate 521 and the second lower shaping plate 523, and the inclined directions of the second inclined edges of the first lower shaping plate 521 and the second lower shaping plate 523 are opposite and parallel to the two first inclined edges of the upper shaping plate 522 respectively. And a flanging gap is reserved between the first inclined edge and the second inclined edge.

In this way, during operation, the packaging film after being folded by the first folding angle module 4 enters between the two folding angle forming dies again, and when the packaging film is conveyed, the folding angle operation can be completed by guiding and shaping the two ends of the packaging film through the upper forming plate 522 of the first lower forming plate 521 and the lower forming plate 523 (the specific folding angle process is not described in detail in the prior art).

Further, in order to avoid the packaging film packed with materials to float when conveying between the bevel forming dies, the pressing plates 53 are arranged on the near sides of the two bevel forming dies, the pressing plates 53 are arranged along the conveying direction of the materials, the pressing plates 53 and the vertical plates 51 are fixed through the fixing frames 531, so that the space for conveying the packaging film packed with the materials is reserved between the pressing plates 53 and the upper surface of the case 1, the materials can be held by pressing, the packaging film packed with the materials is prevented from floating in the conveying process, and the bevel quality of the packaging film is ensured.

Further, in order to ensure that the packaging film wrapped with the material is righted when entering the second corner module 5 from the first corner module 4, the second corner module 5 is further provided with a righting component.

Specifically, the righting assemblies are respectively disposed between the two vertical plates 51 and near one end of the feed. The righting assembly includes an upper base plate 54 and a lower base plate 55 which are arranged in water and parallel to each other, and one sides of the upper base plate 54 and the lower base plate 55 are fixed to the vertical plate 51. A clamping block 56, a swinging crank 57 and a clamping finger 58 are horizontally arranged between the upper base plate 54 and the lower base plate 55, wherein the clamping block 56 is fixed between the upper base plate 54 and the lower base plate 55 and is positioned on one side of the upper base plate 54 and the lower base plate 55 away from the first corner module 4, the swinging crank 57 is rotatably connected between the upper base plate 54 and the lower base plate 55, the rotating axis of the swinging crank 57 is vertically arranged, and the swinging crank 57 is positioned on one side of the clamping block 56 close to the first corner module 4. The clamping fingers 58 comprise two clamping plates, the two clamping plates are symmetrically fixed on the upper side and the lower side of the swing crank 57, namely, the swing crank 57 can drive the two clamping fingers 58 to swing synchronously, and one ends of the two clamping plates, which deviate from the swing crank 57, also bend towards the middle direction of the case 1, so that the clamping plates are L-shaped overall to form the abutting ends of the clamping fingers 58.

A pushing spring 59 is further fixed between the swing crank 57 and the clamping block 56, and in a normal state, the pushing spring 59 can push the swing crank 57 to swing to the outer side of the first lower forming plate 521 abutting against the forming plate 52, at this time, the whole extending direction of the clamping finger 58 is set along the length direction of the case 1, and the abutting end of the clamping finger 58 is located in front of the feeding side of the forming plate 52 and used for supporting two ends of the packaging film wrapped with materials before entering the two forming plates 52.

The two brackets 461 in the first angle folding module 4 are also fixed with opening and closing cranks 48 on the near sides thereof, the two opening and closing cranks 48 are positioned on one sides of the two brackets 47 close to the second angle folding module 5, and the ends of the two opening and closing cranks 48 close to each other are bent vertically towards the direction of the second angle folding module 5 to form an abutting part. The outer side of the swing crank 57 of the second bevel module 5 is also provided with an abutting surface.

When the floating seat 46 drives the opening and closing crank 48 to move towards the second folding angle module 5 through the two supporting seats 461, the abutting parts of the two opening and closing crank 48 abut against the abutting surfaces of the two swinging crank 57, so that the two swinging crank 57 are pushed to swing away from each other, the abutting ends of the two clamping fingers 58 are driven to swing away from each other, so that the packaging film wrapped with the material is sent to the front side of the feeding end of the two shaping plates 52, and when the floating seat 46 drives the opening and closing crank 48 to move away from the second folding angle module 5 through the two supporting seats 461, the abutting parts of the two opening and closing crank 48 are gradually separated from the abutting surfaces of the two swinging crank 57, at the moment, the pushing spring 59 pushes the two swinging crank 57 to swing towards each other, so that the two clamping fingers 58 are driven to swing towards each other until the close sides of the two swinging crank 57 abut against the shaping plates 52, and the abutting ends of the two clamping fingers 58 abut against the two ends of the packaging film wrapped with the material.

In order to reduce the friction between the abutting part of the opening and closing crank 48 and the swinging crank 57, the abutting end of the opening and closing crank 48 can also be rotationally connected with a rolling element, and the rolling element can adopt a roller or a bearing so as to achieve the purpose of pushing the swinging crank 57 to operate through the abutting of the rolling element and reduce the friction.

The operation process of the righting component is as follows: along with the continuous feeding of the packaging film wrapped with the materials, after the packaging film wrapped with the materials completes the preliminary angle folding from the first angle folding module 4, when the packaging film wrapped with the materials enters the second angle folding module 5 to carry out the subsequent integral angle folding, firstly, the floating seat 46 keeps synchronous movement with the materials of the packaging film wrapped with the materials, the inserting angles 471 of the two brackets 47 realize angle folding, simultaneously, the packaging film wrapped with the materials is kept to support the two ends of the materials before being sent to the shaping plate 52, at the moment, the clamping fingers 58 on the two sides of the case 1 are in an open state, the packaging film wrapped with the materials is guaranteed to be in place, then, the floating seat 46 drives the two brackets 47 to reset, the two clamping fingers 58 tend to swing in the similar direction, the abutting ends of the two clamping fingers 58 are also abutted against the two ends of the packaging film wrapped with the materials, and the packaging film wrapped with the materials is kept to support the two ends of the materials before being sent to the shaping plate 52. Then, the subsequent material is fed, the former material also enters the two shaping plates 52 to complete the integral angle, and the clamping fingers 58 repeat the steps to open and close again to keep the material supported.

Referring to fig. 10, a corner heat-sealing module 6 is disposed at the end of the second corner module 5, for heat-sealing the two ends of the packaging film after complete corner folding.

Specifically, the corner heat-sealing module 6 includes pushing cylinders 61 fixed on two sides of the length direction of the case 1 respectively, the axial directions of the two pushing cylinders 61 are perpendicular to the length direction of the case 1, the telescopic rods of the two pushing cylinders 61 face to similar directions and are vertically fixed with a vertically arranged housing 62, the length direction of the housing 62 is arranged along the length direction of the case 1, the similar sides of the housing 62 on two sides are all open, and are connected with a heating plate 64 through a support plate 63, the heating plate 64 adopts an electric heating plate 64, the heating plate 64 is conveniently inserted into the electric heating pipe 64, and a yielding hole is reserved on the upper sides of the support plate 63 and the housing 62, and in addition, a heat insulation plate 65 is further fixed in the housing 62 and used for preventing the heating plate 64 from directly abutting against the housing 62.

The operation process of the bevel heat sealing module 6 is as follows: when the two ends of the packaging film wrapped with the materials are completely folded and then sent between the two heating plates 64 from the two shaping plates 52, the two pushing cylinders 61 drive the telescopic rods to extend, so that the heating plates 64 are abutted against the two ends of the packaging film wrapped with the materials, the heat sealing of the folded corners at the two ends of the packaging film can be realized, and after the heat sealing, the two pushing cylinders 61 drive the two heating plates 64 to reset, and the materials are sent out. So far, the packaging film can completely wrap the materials.

In summary, the overall operation process of the packaging heat sealing device of the envelope type packaging machine of the embodiment is as follows:

after the packaging film wrapped with the materials is sent to the heat-sealing area of the case 1, firstly the heat-sealing upper pressing plate 231 moves upwards, the heat-sealing lower pressing plate 331 moves downwards, the back folds of the packaging film between the heat-sealing upper pressing plate 231 and the heat-sealing lower pressing plate 331 are pressed and heat-sealed, after the heat sealing is completed, the heat-sealing upper pressing plate 231 is lifted to be separated from the packaging film, and the heat-sealing lower pressing plate 331 pushes the part of the back folds of the packaging film after the heat sealing to push the part of the packaging film towards the packaging material of the packaging film, so that the back folds of the packaging film after the heat sealing are attached to the position of the packaging material of the packaging film, and the complete heat-sealing operation of the back folds of the packaging film can be completed through the heat-sealing lower pressing plate 331.

When the packaging film wrapped with the materials is sent to the back sealing area, the fourth cam 41 rotates to drive the first rocker arm 42 to swing, then the spring telescopic rod 44 can drive the fourth rocker arm 431 to swing, the two sliding seats 45 can be driven to slide along the two linear guide rails 13 through the swing of the two fourth rocker arms 431, the floating seat 46 drives the two supporting seats 461 to move, the two supporting seats 47 can tend to move in the direction of the packaging film wrapped with the materials, the two ends of the packaging film are inserted through the two inserting angles 471, and accordingly the first folding angles can be formed at the two ends of the packaging film.

Along with the continuous feeding of the packaging film wrapped with the materials, after the primary folding angle of the packaging film wrapped with the materials is finished from the first folding angle module 4, the floating seat 46 keeps moving synchronously with the materials of the packaging film wrapped with the materials, the inserting angles 471 of the two supports 47 realize folding angles, meanwhile, the packaging film wrapped with the materials are kept to be supported at two ends of the materials before being sent to the shaping plate 52, at the moment, the clamping fingers 58 at two sides of the case 1 are in an open state, the packaging film wrapped with the materials are guaranteed to be in place, then, the floating seat 46 drives the two supports 47 to reset, the two clamping fingers 58 tend to swing in the similar direction, the abutting ends of the two clamping fingers 58 also abut against the two ends of the packaging film wrapped with the materials, and the packaging film wrapped with the materials is kept to be supported at two ends of the materials before being sent to the shaping plate 52.

Then, the packaging film with the materials is put between the two shaping plates 52, and the angle folding operation can be completed through the guiding shaping of the upper shaping plate 522 of the first lower shaping plate and the second lower shaping plate 523.

Finally, after the two ends of the packaging film wrapped with the materials are completely folded, when the packaging film is sent between the two heating plates 64 from the two shaping plates 52, the two pushing cylinders 61 drive the telescopic rods to extend, so that the heating plates 64 are abutted against the two ends of the packaging film wrapped with the materials, the heat sealing of the folded corners at the two ends of the packaging film can be realized, and after the heat sealing, the two pushing cylinders 61 drive the two heating plates 64 to reset, and the materials are sent out. So far, the packaging film can completely wrap the materials.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. A packaging heat-sealing device of an envelope type packaging machine, comprising:

the machine case (1) is provided with a material conveying path for conveying the packaging film after wrapping the material on one side;

a heat-sealing upper pressing plate (231) vertically movably arranged above the material conveying path;

the second cross beam (32) is vertically and movably arranged below the material conveying path;

a heat-seal lower pressure plate (331) vertically arranged on the second cross beam (32), and the heat-seal lower pressure plate (331) can swing relative to the second cross beam (32);

the heat-sealing lower pressing plate (331) can synchronously rise along with the rising of the second cross beam (32) and is matched with the vertically-falling heat-sealing upper pressing plate (231) to finish the heat sealing of the folded edges of the packaging film after wrapping the materials;

after the heat sealing of the heat sealing upper pressing plate (231) is finished, the heat sealing lower pressing plate (331) swings to fold the folded edges of the heat sealed packaging film and heat-seal the folded edges of the heat sealed packaging film on the peripheral surface of the packaging film.

2. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 1, further comprising:

The first sliding shaft (21) is vertically and movably arranged at one side of the chassis (1) corresponding to the conveying path, and the heat-sealing lower pressing plate (331) is fixedly arranged at the upper end of the first sliding shaft (21);

the first pushing spring is arranged on one side of the case (1) and is used for pushing the first sliding shaft (21) to vertically move downwards;

the first swing arm (251) is arranged on one side of the chassis (1) in a swinging manner, and the first swing arm (251) swings and can push the first sliding shaft (21) to ascend;

the first cam (24) is rotatably arranged at one side of the case (1);

the first rocker (241) is rotationally arranged on one side of the chassis (1), and one end of the first rocker (241) is abutted against the first cam (24) and swings back and forth along with the rotation of the first cam (24);

the first pull rod (27) is movably connected between the first rocker (241) and the first swing arm (251).

3. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 1, further comprising:

the first sliding block (31) is vertically and movably arranged at one side of the chassis (1) corresponding to the conveying path, and the second cross beam (32) is fixed on the first sliding block (31);

the third swing arm (381) is rotationally arranged on the side wall of the chassis (1), one end of the third swing arm (381) is connected with the first sliding block (31), and the first sliding block (31) can be pushed to move along with the swinging of the third swing arm (381);

A third cam (36) rotatably provided to the casing (1);

the third rocker (371) is rotatably arranged on the chassis (1), and one end of the third rocker (371) is abutted against the third cam (36) and swings back and forth along with the rotation of the third cam (36);

and the third pull rod (39) is movably connected between the third rocker (371) and the third swing arm (381).

4. A packaging heat-seal apparatus of an envelope type packaging machine as claimed in claim 3, further comprising:

the third tension spring (391) is fixed between the chassis (1) and the third swing arm (381) and is used for pulling and holding one end, connected with the third pull rod (39), of the third swing arm (381) to move downwards, so that the third pull rod (39) can push the third rocker (371) to always abut against the third cam (36).

5. A packaging heat-seal apparatus of an envelope type packaging machine as claimed in claim 3, further comprising:

the second cam is rotationally connected with the chassis (1);

the second rocker (34) is rotationally connected with the chassis (1), and one end of the second rocker (34) is abutted against the second cam and can swing back and forth along with the rotation of the second cam;

and one end of the second pull rod (35) is movably connected with the second rocker (34) and the other end of the second pull rod is movably connected with the heat-seal lower pressing plate (331).

6. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 5 further comprising:

the second tension spring (341) is connected between the chassis (1) and the second rocking bar (34) and is used for pulling the second rocking bar (34) so that the second rocking bar (34) is abutted against the second cam.

7. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 5 further comprising:

two first brackets (47) which are symmetrically arranged at two sides of the material conveying path along the reciprocating motion of the material conveying direction and are positioned between the operation areas of the heat-sealing upper pressing plate (231) and the heat-sealing lower pressing plate (331);

the two inserting angles (471) are respectively fixed on opposite sides of the two first brackets (47) and move along with the two first brackets (47), and the inserting angles (471) can be abutted against two ends of the packaging film wrapped with the materials and enable the packaging film to form a first folding angle.

8. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 7 further comprising:

the floating seat (46) is arranged on the machine case (1) in a reciprocating manner along the conveying direction of the materials, and the two brackets (47) are both fixed on the floating seat (46);

the fourth swing arm (431) is hinged to the case (1) and is used for driving the floating seat (46), and the floating seat (46) can be driven to reciprocate along with the swing of the fourth swing arm (431);

A fourth cam (41) which is provided in the chassis (1) so as to rotate continuously;

the first rocker arm (42) is rotatably arranged on the chassis (1), one end of the first rocker arm is matched with the fourth cam (41) and can swing back and forth along with the rotation of the fourth cam (41);

the spring telescopic rod (44) is movably connected between the first rocker arm (42) and the fourth rocker arm (431) and is used for driving the fourth rocker arm (431) to synchronously swing along with the first rocker arm (42).

9. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 1, further comprising:

the two corner forming dies are arranged at two sides of the material conveying path and are used for carrying out complete corner folding on the packaging film after the first corner folding;

the two heating plates (64) are arranged on two sides of the material conveying path in a relatively moving manner, and the two heating plates (64) are relatively moved, so that two ends of the packaging film wrapped with the material after the complete folding angle can be abutted and heat-sealed.

10. The packaging and heat-sealing apparatus of an envelope packaging machine of claim 9 further comprising:

the swing crank (57) is horizontally and rotatably arranged at one side of the feed end of the bevel forming die;

the clamping finger (58) is fixed on one side of the swing crank (57) corresponding to the feed end of the angle forming die;

A pushing spring (59) which is positioned at one side of the feeding end of the folding angle forming die and is used for pushing the swinging crank (57) so that the clamping finger (58) can keep the end of the packaging film which is wrapped with the material and is positioned at the front side of the folding angle forming die to be supported;

the two opening and closing cranks (48) reciprocate on the front side of the folding angle forming die along the material conveying path, and the opening and closing cranks (48) can push the two swinging cranks (57) to swing so that the clamping fingers (58) swing in the direction away from the end part of the packaging film wrapped with the material.