CN112875026B

CN112875026B - PE plastic packaging bag

Info

Publication number: CN112875026B
Application number: CN202110048017.4A
Authority: CN
Inventors: 孙安涛; 王浩然
Original assignee: Xuncheng Packaging Shenzhen Co ltd
Current assignee: Xuncheng Packaging Shenzhen Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-12-16
Anticipated expiration: 2041-01-14
Also published as: CN112875026A

Abstract

The invention relates to the technical field of packaging bags, in particular to a PE plastic packaging bag which comprises a packaging bag body, wherein the packaging bag body comprises a front bag face, a bottom face, a rear bag face, a front pull edge, a rear pull edge, a left embedded plate and a right embedded plate, the bottom end of the front bag face is connected with the front end of the bottom face in a foldable mode, the bottom end of the front pull edge is connected with the upper end of the front bag face in a hinged mode, the bottom end of the rear bag face is connected with the rear end of the bottom face in a foldable mode, the bottom end of the rear pull edge is connected with the upper end of the rear bag face in a hinged mode, the front end and the rear end of the left embedded plate are respectively buckled with the left portions of the front bag face and the rear bag face, and the front end and the rear end of the right embedded plate are respectively buckled with the right portions of the front bag face and the rear bag face. This PE plastic packaging bag, the structure sets up rationally, and convenient upset is folding or the use of expandeing to pave, and the bag face keeps straight, and is more neat pleasing to the eye, and the daily trip of being convenient for is carried and is accomodate, and is more simple and convenient practical firm, and the packing is difficult for crooked, uses more relieved.

Description

PE plastic packaging bag

Technical Field

The invention relates to the technical field of packaging bags, in particular to a PE plastic packaging bag.

Background

Polyethylene is a thermoplastic resin prepared by polymerizing ethylene, polyethylene is odorless and nontoxic, feels like wax, has excellent low-temperature resistance, has good chemical stability, can resist corrosion of most of acid and alkali, cannot resist acid with oxidation property, is insoluble in common solvents at normal temperature, has small water absorption and excellent electrical insulation, most of the existing plastic bags are made of polyethylene materials, the commodity of the packaging bag is more and more remarkable, the existing plastic bags become special products which are not attached to commodity production, particularly plastic bags which become indispensable articles in our lives, plastic packaging bags are bags made of nitrocellulose serving as a main raw material, are indispensable articles in people's daily life, are often used for packaging other articles, and are widely used for packaging bags for producing various articles in daily life and industrial production due to the advantages of low price, extremely light weight, large capacity and convenience in storage.

The plastic packaging bag that uses now sets up single relatively thin, is difficult to keep leveling straight, leads to the milk teacup of well cup and the mug that packs, coffee cup to incline askew easily, places and not steady safety, directly abandons after the use simultaneously and can the polluted environment, but is dirty in disorder when retrieving, is difficult to put in order and accomodates, uses inconvenient.

Disclosure of Invention

The invention provides a PE plastic packaging bag, which overcomes the defects that a beverage plastic packaging bag in the prior art is thinner and difficult to keep flat and straight, so that packaged milk tea cups and coffee cups of middle cups and large cups are easy to incline and fall, are not stable and safe to place, and are directly discarded after being used to pollute the environment, but are dirty and messy in recycling and difficult to put in order and store. A PE plastic packaging bag has that the structure sets up rationally, and preceding bag face and back bag face are beta structure, and the convenient upset is folded or is expanded and pave the use, and the bag face keeps straight, and the structure is more firm stable, convenient equipment and split, and convenient repetitious usage helps reducing extravagant and pollution, uses characteristics of being more simple and convenient relieved.

In order to achieve the purpose, the invention provides the following technical scheme: a PE plastic packaging bag comprises a packaging bag body, wherein the packaging bag body comprises a front bag face, a bottom face, a rear bag face, a front pulling edge, a rear pulling edge, a left embedded plate and a right embedded plate, the bottom end of the front bag face is connected with the front end of the bottom face in a foldable mode, the bottom end of the front pulling edge is connected with the upper end of the front bag face in a hinged mode, the bottom end of the rear bag face is connected with the rear end of the bottom face in a foldable mode, the bottom end of the rear pulling edge is connected with the upper end of the rear bag face in a hinged mode, the front end and the rear end of the left embedded plate are respectively buckled with the left portions of the front bag face and the rear bag face, and the front end and the rear end of the right embedded plate are respectively buckled with the right portions of the front bag face and the rear bag face;

the equal vertically fixed in both ends has a set of underframe face about the up end of bottom surface, and is provided with left storage grid on the medial surface of one end underframe face to be provided with right storage grid on the medial surface of other end underframe face, and the up end mid-mounting of bottom surface has moulding underframe, and the notch card of moulding underframe left end is in the bottom of right storage grid, and the notch card of moulding underframe right-hand member is in the bottom of left storage grid.

Further, a right groove is formed in one side of the upper portion of the front bag face, a right fixing pin is arranged in the right groove, a left groove is formed in the other side of the upper portion of the front bag face, a left fixing pin is arranged in the left groove, a right clamping groove is formed in the left portion of the front bag face, and a left clamping groove is formed in the right portion of the front bag face.

Further, the upper portion that the prerequisite was drawn the limit is provided with the handle, and the opening has been seted up at the middle part of handle to the bottom left part that the prerequisite was drawn the limit is provided with the right side and connects the limit, and the bottom right part that the prerequisite was drawn the limit is provided with the left side and connects the limit.

Further, the right side of prerequisite draw limit bottom is connected with articulated between the right fixed pin on the preceding bag face, and the left side of prerequisite draw limit bottom is connected with articulated between the left fixed pin on the preceding bag face to the prerequisite is drawn the limit and is reversible structure.

Further, back bag face and preceding bag face, back carry the limit and the prerequisite draws the limit all to become symmetrical structure around the central line of bottom surface, and back carry and draw limit both sides to be provided with right side connection limit and left side connection limit about the bottom end to the back is carried and is drawn the right side connection limit of limit bottom and is connected with the right fixed pin on the back bag face between articulated, and the left side connection limit of back carry limit bottom is connected with the left fixed pin on the back bag face between articulated, and back is carried and is drawn the limit and be reversible structure.

Furthermore, the upper end of the right panel is provided with an upper baffle, the upper portion of the right panel is provided with an arc-shaped through hole, the left end of the right panel is provided with a left clamping edge, the right end of the right panel is provided with a right clamping edge, the inner side and the outer side of the left clamping edge and the right clamping edge are respectively convexly provided with a limiting edge, the left panel and the right panel form a left-right symmetrical structure relative to the center line of the bottom surface, and the left panel and the right panel are identical in structure.

Furthermore, the limit edge on the left clamp edge of the left panel is connected with the right clamp groove on the front bag face in a buckling mode, the limit edge on the right clamp edge of the left panel is connected with the right clamp groove on the rear bag face in a buckling mode, and the left panel is detachably connected with the left portions of the front bag face and the rear bag face respectively.

Furthermore, the limiting edge on the left clamping edge of the right panel is connected with the left clamping groove on the front bag face in a buckling mode, the limiting edge on the right clamping edge of the right panel is connected with the left clamping groove on the rear bag face in a buckling mode, and the right panel is detachably connected with the right portions of the front bag face and the rear bag face respectively.

Further, the angle that can turn over between the bottom of preceding bag face and the front end of bottom surface sets up to 0-90, and but folding angle between the bottom of back bag face and the rear end of bottom surface is 0-90 to the bottom surface of moulding underframe just in time is located the up end of bottom surface, and moulding underframe is installed and is taken in between check and the left side storage check right side, but and but split connection between moulding underframe and the bottom surface.

Compared with the prior art, the invention has the beneficial effects that:

1. the front bag face and the rear bag face are respectively connected with the bottom face in a foldable mode, can be erected by being turned over upwards by 90 degrees, are convenient to fold and assemble into a complete packaging bag structure, and are simple and quick to assemble;

2. the front pull edge and the front bag surface as well as the rear pull edge and the rear bag surface are hinged, so that the hinged prescription of the front pull edge and the rear pull edge can be flexibly turned over and moved, and the lifting and the laying are convenient and automatic in daily life;

3. a group of bottom frame surfaces are vertically arranged at the left end and the right end of the upper end surface of the bottom surface, the bottom frame surfaces at the two sides are utilized to enclose the space at the left side surface and the right side surface of the bottom surface, and a bag bottom frame of a flat and firm packaging bag is molded;

4. the left containing grids and the right containing grids are respectively arranged on the two groups of bottom frame surfaces on the bottom surface, so that the design of the invention is more humanized, a user can conveniently place some smaller objects, and the invention is more convenient for daily containing and use;

5. moulding underframe must set up the moulding of mainly used bottom surface, and the straightness of guarantee bottom surface is stable, makes its non-deformable, and is more durable firm, and the milky tea cup or the coffee cup of placing well cup mug all divide all to be more stable, use more reliable at ease.

Drawings

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

FIG. 2 is a schematic right-view of the structure of the present invention;

FIG. 3 is a schematic view of the deployment of the inventive structure;

FIG. 4 is a schematic view of the front and back pocket sides of the inventive structure shown expanded to both sides;

FIG. 5 is a schematic view of the front and rear pouch faces of the present inventive structure folded upwardly;

FIG. 6 is a schematic bottom perspective view of the structure of the present invention;

FIG. 7 is a bottom elevation view of the structure of the present invention;

FIG. 8 is a schematic front pocket configuration of the present invention;

FIG. 9 is a schematic view of the right panel structure of the present invention;

fig. 10 is a schematic perspective view of a molding bottom frame according to the present invention.

The reference numbers in the figures: 1. a packaging bag body; 2. front bag surface; 3. a bottom surface; 4. a back bag surface; 5. drawing an edge on the premise; 6. carrying out back edge lifting; 7. a left storage grid; 8. a bottom frame surface; 9. a right storage grid; 10. a right card slot; 11. a left card slot; 12. a right fixing pin; 13. a right groove; 14. a right connecting edge; 15. a left fixing pin; 16. a left groove; 17. a left connecting edge; 18. a handle; 19. a port; 20. a left panel; 21. a right panel; 22. a limiting edge; 23. an arc-shaped through hole; 24. an upper baffle plate; 25. a left clamping edge; 26. a right clamping edge; 27. and shaping the bottom frame.

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. 1-10, the present invention provides a technical solution: a PE plastic packaging bag comprises a packaging bag body 1, wherein the packaging bag body 1 comprises a front bag face 2, a bottom face 3, a rear bag face 4, a front pull edge 5, a rear pull edge 6, a left panel 20 and a right panel 21, the bottom end of the front bag face 2 is connected with the front end of the bottom face 3 in a foldable mode, the bottom end of the front pull edge 5 is connected with the upper end of the front bag face 2 in a hinged mode, the bottom end of the rear bag face 4 is connected with the rear end of the bottom face 3 in a foldable mode, the bottom end of the rear pull edge 6 is connected with the upper end of the rear bag face 4 in a hinged mode, the front end and the rear end of the left panel 20 are respectively buckled with the left portions of the front bag face 2 and the rear bag face 4, and the front end and the rear end of the right panel 21 are respectively buckled with the right portions of the front bag face 2 and the rear bag face 4;

the folding angle between the bottom end of the front bag face 2 and the front end of the bottom face 3 is set to be 0-90 degrees, the folding angle between the bottom end of the rear bag face 4 and the rear end of the bottom face 3 is 0-90 degrees, the bottom face of the shaping bottom frame 27 is just positioned on the upper end face of the bottom face 3, the shaping bottom frame 27 is installed between the right storage grid 9 and the left storage grid 7, and the shaping bottom frame 27 is detachably connected with the bottom face 3;

a group of bottom frame surfaces 8 are vertically fixed at the left end and the right end of the upper end surface of the bottom surface 3, a left containing grid 7 is arranged on the inner side surface of the bottom frame surface 8 at one end, a right containing grid 9 is arranged on the inner side surface of the bottom frame surface 8 at the other end, elastic telescopic openings are arranged at the upper ports of the left containing grid 7 and the right containing grid 9, and bag surfaces of the left containing grid 7 and the right containing grid 9 are transparent and visible;

a shaping bottom frame 27 is arranged in the middle of the upper end face of the bottom face 3, a notch at the left end of the shaping bottom frame 27 is clamped at the bottom of the right containing grid 9, and a notch at the right end of the shaping bottom frame 27 is clamped at the bottom of the left containing grid 7;

the upper part of the premise edge-drawing 5 is provided with a handle 18, the middle part of the handle 18 is provided with an opening 19, the handle 18 is made of PVC plastic, the handle 18 adopts an elliptical ring sleeve structure, the left part of the bottom end of the premise edge-drawing 5 is provided with a right connecting edge 14, the right part of the bottom end of the premise edge-drawing 5 is provided with a left connecting edge 17, the right connecting edge 14 at the bottom end of the premise edge-drawing 5 is hinged with the right fixing pin 12 on the front bag surface 2, the left connecting edge 17 at the bottom of the premise edge-drawing 5 is hinged with the left fixing pin 15 on the front bag surface 2, the premise edge-drawing 5 is of a reversible structure, so that the premise edge-drawing 5 can be turned over through the left connecting edge 17 and the right connecting edge 14 at the bottom to lift up the use or turn over the direction at any time, the bag is more flexible and convenient, the rear bag face 4, the front bag face 2, the rear lifting edge 6 and the front pulling edge 5 are in a front-back symmetrical structure about the central line of the bottom face 3, the right and left sides of the bottom end of the rear lifting edge 6 are provided with a right connecting edge 14 and a left connecting edge 17, the right connecting edge 14 of the bottom end of the rear lifting edge 6 is hinged with a right fixing pin 12 on the rear bag face 4, the left connecting edge 17 of the bottom end of the rear lifting edge 6 is hinged with a left fixing pin 15 on the rear bag face 4, the rear lifting edge 6 is of a reversible structure, the rear lifting edge 6 can be turned over through the left connecting edge 17 and the right connecting edge 14 at the bottom, and the bag is convenient to pick up at any time or put down after being turned over when not used, and is more light and practical;

a right groove 13 is formed in one side of the upper portion of the front bag face 2, a right fixing pin 12 is installed inside the right groove 13, a left groove 16 is formed in the other side of the upper portion of the front bag face 2, a left fixing pin 15 is installed inside the left groove 16, a right clamping groove 10 is formed in the left portion of the front bag face 2, a left clamping groove 11 is formed in the right portion of the front bag face 2, and the width and the depth of the left clamping groove 11 are the same as those of the right clamping groove 10;

an upper baffle plate 24 is arranged at the upper end of the right panel 21, an arc-shaped through hole 23 is formed in the upper portion of the right panel 21, a left clamping edge 25 is arranged at the left end of the right panel 21, a right clamping edge 26 is arranged at the right end of the right panel 21, limiting edges 22 are convexly arranged on the inner side and the outer side of each of the left clamping edge 25 and the right clamping edge 26, the left panel 20 and the right panel 21 are in a left-right symmetrical structure relative to the center line of the bottom surface 3, the left panel 20 and the right panel 21 are in the same structure, the left panel 20 and the right panel 21 are made of PE (polyethylene) transparent plastic thin plates with the thickness of 3-4mm, the limiting edges 22 on the left clamping edge 25 of the left panel 20 are connected with the right clamping grooves 10 on the front bag surface 2 in a buckling mode, the limiting edges 22 on the right clamping edge 26 of the left panel 20 are connected with the right clamping grooves 10 on the rear bag surface 4 in a buckling mode, the left panel 20 is detachably connected with the left clamping grooves on the front bag surface 2 and the right clamping edges 22 on the front bag surface 21 and the right clamping edges 22 and the front bag surface 11 are connected with the right clamping grooves 22 on the front bag surface 21.

The packaging bag body 1 is mainly composed of a front bag face 2, a bottom face 3, a rear bag face 4, a front pull edge 5 and a rear pull edge 6, wherein the front bag face 2 and the rear bag face 4 at the front end and the rear end of the bottom face 3 are of foldable structures, and can be turned upwards by 90 degrees to stand up when being used conveniently, and turned downwards by 90 degrees to the outer side when not being used, and can be unfolded so as to be directly spread and unfolded towards the front side and the rear side of the bottom face 3, so that goods can be taken conveniently, and the bag faces are kept straight and neat and beautiful;

a group of bottom frame surfaces 8 are arranged at the left end and the right end of the upper end surface of the bottom surface 3, the bottom frame surfaces 8 are always kept in a state of being vertical to the bottom surface 3, so that the space of the left side surface and the space of the right side surface of the bottom surface 3 are enclosed, and meanwhile, a left containing grid 7 and a right containing grid 9 are respectively arranged on the inner side surfaces of the bottom frame surfaces 8 at the left end and the right end, so that a user can conveniently place small objects, the small objects are prevented from being crushed, and the small objects are contained more integrally and orderly;

the front bag face 2 and the rear bag face 4, the front pull edge 5 and the rear pull edge 6 are of front symmetrical structures relative to the center line of the bottom face 3, the front pull edge 5 is hinged to the left fixing pin 15 and the right fixing pin 12 on the front bag face 2 through the left connecting edge 17 and the right connecting edge 14 of the bottom, the rear pull edge 6 is hinged to the left fixing pin 15 and the right fixing pin 12 on the rear bag face 4 through the left connecting edge 17 and the right connecting edge 14 of the bottom, so that the front pull edge 5 and the rear pull edge 6 can be turned over at any time, the front pull edge 5 and the rear pull edge 6 can be conveniently leaned together when being lifted, the front pull edge and the rear pull edge can be respectively turned over towards the front side and the rear side when not being used, and the use is simple and flexible;

the thickness of each bag surface of the packaging bag body 1 is set to be thick, the packaging bag body is made of PE plastic, the PE plastic is polyethylene plastic, and has corrosion resistance and electrical insulation, and a plastic packaging bag made of the PE plastic is firmer and more durable;

meanwhile, the front bag face 2, the bottom face 3 and the rear bag face 4 in the packaging bag body 1 are convenient to fold for use, the front pull edge 5 and the rear pull edge 6 are convenient to turn over for use, so that the packaging bag can be folded at any time, the folding is simple and quick, and the handles 18 on the front pull edge 5 and the rear pull edge 6 are thicker and larger, are suitable for different users, and are thick, solid and durable;

the left panel 20 is embedded between the left clamping groove 11 on the front bag face 2 and the rear bag face 4, the right nipper 21 is embedded between the right clamping groove 10 on the front bag face 2 and the rear bag face 4, and the left panel 20 and the right nipper 21 are identical in structure arrangement, so that the assembly and disassembly are convenient, and the use is flexible and convenient;

simultaneously both ends are provided with left card limit 25 and right card limit 26 respectively about left panel 20 and right nipper 21, left side card limit 25 and right card limit 26 the front and back both sides face all is provided with spacing limit 22, spacing limit 22 can help left card limit 25 and right card limit 26 card outside left draw-in groove 11 and right draw-in groove 10, it is stable firm to make left panel 20 and right nipper 21 gomphosis between the two portions of controlling of bag face 2 and back bag face 4 in the front, difficult the unclamping, it is straight to make it keep level and smooth, it is more stable firm to place, avoid the drink slope to incline askew and fall, pack safe and reliable more.

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 PE plastic packaging bag, includes wrapping bag body (1), its characterized in that: the packaging bag comprises a packaging bag body (1) and is characterized in that the packaging bag body (1) comprises a front bag face (2), a bottom face (3), a rear bag face (4), a front pull edge (5), a rear pull edge (6), a left embedded plate (20) and a right embedded plate (21), the bottom end of the front bag face (2) is connected with the front end of the bottom face (3) in a foldable mode, the bottom end of the front pull edge (5) is connected with the upper end of the front bag face (2) in a hinged mode, the bottom end of the rear bag face (4) is connected with the rear end of the bottom face (3) in a foldable mode, the bottom end of the rear pull edge (6) is connected with the upper end of the rear bag face (4) in a hinged mode, the front end and the rear end of the left embedded plate (20) are respectively buckled with the left portions of the front bag face (2) and the rear bag face (4), and the front end and the rear end of the right embedded plate (21) are respectively buckled with the right portions of the front bag face (2) and the rear bag face (4);

a group of bottom frame surfaces (8) are vertically fixed at the left end and the right end of the upper end surface of the bottom surface (3), a left containing grid (7) is arranged on the inner side surface of the bottom frame surface (8) at one end, a right containing grid (9) is arranged on the inner side surface of the bottom frame surface (8) at the other end, a shaping bottom frame (27) is arranged in the middle of the upper end surface of the bottom surface (3), a notch at the left end of the shaping bottom frame (27) is clamped at the bottom of the right containing grid (9), and a notch at the right end of the shaping bottom frame (27) is clamped at the bottom of the left containing grid (7);

an upper baffle plate (24) is arranged at the upper end of the right panel (21), an arc-shaped through hole (23) is formed in the upper portion of the right panel (21), a left clamping edge (25) is arranged at the left end of the right panel (21), a right clamping edge (26) is arranged at the right end of the right panel (21), limiting edges (22) are convexly arranged on the inner side and the outer side of the left clamping edge (25) and the right clamping edge (26), the left panel (20) and the right panel (21) are in a left-right symmetrical structure relative to the center line of the bottom surface (3), and the left panel (20) and the right panel (21) are identical in structure arrangement;

the limiting edge (22) on the left clamping edge (25) of the left panel (20) is connected with the right clamping groove (10) on the front bag surface (2) in a buckling mode, the limiting edge (22) on the right clamping edge (26) of the left panel (20) is connected with the right clamping groove (10) on the rear bag surface (4) in a buckling mode, and the left panel (20) is detachably connected with the left portions of the front bag surface (2) and the rear bag surface (4) respectively;

the limiting edge (22) on the left clamping edge (25) of the right panel (21) is connected with the left clamping groove (11) on the front bag surface (2) in a buckling mode, the limiting edge (22) on the right clamping edge (26) of the right panel (21) is connected with the left clamping groove (11) on the rear bag surface (4) in a buckling mode, and the right panel (21) is detachably connected with the right parts of the front bag surface (2) and the rear bag surface (4) respectively;

the angle that can turn over between the bottom of preceding bag face (2) and the front end of bottom surface (3) sets up to 0-90, and but folding angle between the bottom of back bag face (4) and the rear end of bottom surface (3) be 0-90 to the bottom surface of moulding underframe (27) just in time is located the up end of bottom surface (3), and moulding underframe (27) are installed and are accomodate between check (7) in right side (9) and left side, and but split connection between moulding underframe (27) and bottom surface (3).

2. The PE plastic packing bag of claim 1, wherein: preceding bag face (2) upper portion one side seted up right recess (13), and the internally mounted of right recess (13) has right fixed pin (12) to preceding bag face (2) upper portion opposite side has seted up left recess (16), and the internally mounted of left recess (16) has left fixed pin (15), and right draw-in groove (10) have been seted up to the left part of preceding bag face (2), and left draw-in groove (11) have been seted up to the right part of preceding bag face (2).

3. The PE plastic packing bag of claim 1, wherein: the upper portion of prerequisite draw limit (5) is provided with handle (18), and opening (19) have been seted up at the middle part of handle (18) to the bottom left part of prerequisite draw limit (5) is provided with right connection limit (14), and the bottom right part of prerequisite draw limit (5) is provided with left connection limit (17).

4. The PE plastic packing bag of claim 1, wherein: the bag is characterized in that the right connecting edge (14) at the bottom end of the premise drawing edge (5) is hinged to the right fixing pin (12) on the front bag face (2), the left connecting edge (17) at the bottom of the premise drawing edge (5) is hinged to the left fixing pin (15) on the front bag face (2), and the premise drawing edge (5) is of a turnover structure.

5. The PE plastic bag of claim 1, wherein: the rear bag face (4) and the front bag face (2), the rear lifting edge (6) and the front pulling edge (5) are of a front-back symmetrical structure relative to the central line of the bottom face (3), a right connecting edge (14) and a left connecting edge (17) are arranged on the left side and the right side of the bottom end of the rear lifting edge (6), the right connecting edge (14) of the bottom end of the rear lifting edge (6) is hinged to a right fixing pin (12) on the rear bag face (4), the left connecting edge (17) of the bottom end of the rear lifting edge (6) is hinged to a left fixing pin (15) on the rear bag face (4), and the rear lifting edge (6) is of a reversible structure.