CN113369147A

CN113369147A - Quick bagging apparatus that overlaps of fragrant pear shipment

Info

Publication number: CN113369147A
Application number: CN202110744968.5A
Authority: CN
Inventors: 刘扬; 蒋鑫; 唐玉荣; 张瑞; 兰海鹏; 张宏; 张权威; 于世辉; 张猛强
Original assignee: Tarim University
Current assignee: Tarim University
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-09-10
Anticipated expiration: 2041-07-01
Also published as: CN113369147B

Abstract

The invention discloses a quick bagging device for bergamot pear delivery, which relates to the technical field of bergamot pear bagging and comprises a conveying belt, a supporting seat, a grading component, a paper supply component, a paper wrapping component, a net sleeving component and a discharge hole, wherein the conveying belt is arranged on one side of the supporting seat, the grading component is arranged on the upper end surface of the supporting seat, a plurality of paper supply components are circumferentially distributed below the grading component, the paper wrapping components are correspondingly arranged below the paper supply components, the net sleeving component is correspondingly fixed on the lower end surface of the paper wrapping component and is positioned in the supporting seat, and the discharge hole is obliquely arranged on one side, close to the side wall of the supporting seat, of the net sleeving component and is used for collecting bergamot pears subjected to bagging. The invention can rapidly grade and bag the bergamot pears, and improves the receiving efficiency of the bergamot pears.

Description

Quick bagging apparatus that overlaps of fragrant pear shipment

Technical Field

The invention relates to the technical field of bergamot pear bagging, in particular to a quick bagging device for bergamot pear delivery.

Background

The bergamot pear packaging bag can play a certain protection role on the bergamot pear, reduce the damage in the transportation process, can also reduce the loss of moisture, improve the storage time, and the bergamot pear packaging bag generally uses wrapping paper to wrap the bergamot pear and then wraps with the foam net.

The prior bergamot pear bagging device is mainly used for directly wrapping bergamot pears with a foam net, the wrapping paper wrapping is directly skipped, the storage time of the bergamot pears is shortened, the bergamot pears are often wrapped manually when being wrapped, the labor force is increased, and the prior bergamot pear bagging device cannot distinguish the size of the bergamot pears, so that the bergamot pears cannot be completely wrapped when being bagged.

Aiming at the problems, the invention provides a quick bagging device for bergamot pear delivery, which aims to solve the problems.

Disclosure of Invention

Technical scheme (I)

The invention is realized by the following technical scheme: the invention provides a quick bagging device for bergamot pear delivery, which comprises a conveying belt, a supporting seat, a grading component, a paper supply component, a paper wrapping component, a net sleeving component and a discharge hole, wherein the conveying belt is arranged on one side of the supporting seat;

the up end of supporting seat is provided with hierarchical subassembly, hierarchical subassembly's below circumference is laid and is equipped with a plurality of paper supply subassemblies, and is a plurality of the below correspondence of paper supply subassembly is provided with a package paper subassembly, the lower terminal surface of package paper subassembly corresponds and is fixed with the cover net subassembly, just the cover net subassembly is located inside the supporting seat, the one side slope that the cover net subassembly is close to the supporting seat lateral wall is provided with the discharge gate for collect the fragrant pear that the cover bag was accomplished.

Further, preferably, the grading component comprises a fixed disc, a grading disc, an arc-shaped baffle and a grading opening, wherein the fixed disc is fixed on the upper end face of the supporting seat through an upright column, the grading disc is coaxially and rotatably arranged in the fixed disc, the center of the grading disc is fixed at the output end of the grading motor, and the grading disc is of a conical table structure;

the fixed disk is close to one side circumference and equidistant the laying of classification dish and is equipped with a plurality of cowl, and is a plurality of be provided with a plurality of hierarchical mouthful between the cowl.

Preferably, the upper end surface of the fixed disc is provided with an inclined surface inclined towards one side far away from the grading disc, the grading ports are fixed on the inclined surface to facilitate the entry of the bergamot pears, and the paper supply assemblies are correspondingly arranged below the grading ports;

air bags are symmetrically fixed at the inlets of the grading ports, and the distances among the air bags are sequentially increased according to the rotating direction of the grading disc;

the air inlets are formed in the upper end faces of the grading ports and communicated with the air bags, and the air input of the air inlets is in direct proportion to the distance between the air bags.

Further, preferably, the paper supply assembly comprises a rotating motor, a placing plate and a placing groove, wherein the placing plate is fixed at the output end of the rotating motor, the placing groove is symmetrically formed in the placing plate, a plurality of adsorption holes are formed in the placing groove and used for adsorbing the packing paper, and the placing groove corresponds to the grading opening.

Further, preferably, the wrapping paper assembly comprises a bottom plate, connecting plates, a rotating shaft and pressing pieces, wherein at least three connecting plates are distributed on the circumference of the upper end face of the bottom plate, the rotating shaft is rotatably arranged in the connecting plates, the pressing pieces are fixed on the rotating shaft, and the pressing pieces can press the bergamot pear wrapping paper to enable the wrapping paper to be attached to the bergamot pears.

Further, preferably, a bergamot pear outlet is formed in the center of the bottom plate and used for sending out bergamot pears, and the rotating shaft is sleeved with a torsion spring and can provide reset power for the pressing piece.

Furthermore, preferably, an auxiliary pressing block is fixed on one side of the top ends of the pressing pieces, which are close to each other, and an arc-shaped surface is arranged on one side of the auxiliary pressing block, so that the packaging paper can be better attached to the bergamot pears;

one side that the bottom of pressing piece is close to each other is provided with the press surface, be equipped with the circular arc chamfer on the press surface for prevent that the bergamot pear from damaging, just, interval between the press surface is less than interval between the press piece.

Further, preferably, the netting assembly comprises a fixed plate, side plates, telescopic rods, sliding plates, a lifting ring, a buffer cutting seat and a conveying column, wherein the side plates are symmetrically fixed on the upper end face of the fixed plate, sliding grooves are formed in the side plates, the sliding plates are slidably arranged in the sliding grooves, and the sliding plates are driven by the telescopic rods fixed in the side plates;

one end of the sliding plate obliquely extends out of the side plate and is fixed by a lifting ring, a conveying column is coaxially arranged in the lifting ring, a buffering cutting seat is coaxially and slidably arranged in the conveying column, and a buffering spring is arranged between the buffering cutting seat and the conveying column.

Further, preferably, a plurality of lifting bins are arranged in the lifting ring close to the inner part of the conveying column along the radial direction of the conveying column, lifting wheels are rotatably arranged in the lifting bins, a plurality of lifting hooks are arranged on the lifting wheels, the lifting hooks are of arc structures, and the concave positions of the arc structures of the lifting hooks face the lifting direction;

and a plurality of limiting parts are rotatably arranged in the lifting bin, one side of each limiting part, which is far away from the lifting wheel, is hinged with one end of a sliding column, and the other end of each sliding column is slidably arranged in the lifting ring.

Further, preferably, a plurality of cutting knives are rotatably arranged in the buffering cutting seat, a cutting spring is arranged between each cutting knife and the buffering cutting seat, a cutting opening is formed in the position, corresponding to the cutting knife, of the conveying column, and a cutting edge of each cutting knife extends out of the buffering cutting seat and is located inside the cutting opening.

(II) advantageous effects

Compared with the prior art, the invention provides a quick bagging device for bergamot pear delivery, which has the following beneficial effects:

according to the invention, the bergamot pears can be divided into four grades according to the size through the arranged grading component, so that grading bagging is convenient, when the bergamot pears are graded, the bergamot pears move along the arc-shaped baffle plate through the rotation of the grading disc, when the bergamot pears move to the grading port, the bergamot pears fall into the corresponding grading ports according to the size of the grading port and the amount of gas in the air bags, the grading accuracy of the bergamot pears is improved, the packing paper on the paper supply component is brought into the paper wrapping component through the weight of the bergamot pears, the paper wrapping component presses the packing paper through the pressing piece, so that the packing paper is attached to the surface of the bergamot pears, the integrity of the packing paper on the bergamot pears is improved, then the bergamot pears with the packing paper fall into the net component, the packing paper is fixed through the foam net, and the bergamot pears which are bagged are sent out through the discharge port, and the automation degree of the bergamot pear bagging is improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

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

FIG. 2 is a schematic view of a grading component of the present invention;

FIG. 3 is a schematic view of a paper wrapping assembly of the present invention;

FIG. 4 is a schematic view of a screen assembly of the present invention;

FIG. 5 is an enlarged schematic view of the invention at point A;

in the figure: 1. a conveyor belt; 2. a supporting seat; 3. a grading component; 31. fixing the disc; 32. a column; 33. grading discs; 34. an arc-shaped baffle plate; 35. a grading port; 36. an air bag; 4. a paper supply assembly; 41. a rotating electric machine; 42. placing the plate; 43. a placement groove; 5. a paper wrapping assembly; 51. a base plate; 52. a connecting plate; 53. a rotating shaft; 54. a pressing member; 55. an auxiliary pressing block; 56. pressing the face; 6. a screen assembly; 61. a fixing plate; 62. a side plate; 63. a sliding groove; 64. a telescopic rod; 65. a sliding plate; 66. lifting the ring; 661. a lifting wheel; 662. a limiting member; 663. a sliding post; 67. buffering the cutting seat; 671. a cutting knife; 672. cutting the spring; 68. a transport column; 681. cutting the opening; 7. and (4) a discharge port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 5, the present invention provides a quick bagging device for delivering bergamot pears: the paper feeding device comprises a conveying belt 1, a supporting seat 2, a grading component 3, a paper feeding component 4, a paper wrapping component 5, a net sleeving component 6 and a discharge hole 7, wherein the conveying belt 1 is arranged on one side of the supporting seat 2;

the up end of supporting seat 2 is provided with grading subassembly 3, grading subassembly 3's below circumference is equipped with a plurality of paper supply subassemblies 4, and is a plurality of paper supply subassembly 4's below correspondence is provided with package paper subassembly 5, the lower terminal surface of package paper subassembly 5 corresponds and is fixed with cover net subassembly 6, just cover net subassembly 6 is located inside supporting seat 2, the lopsidedness that cover net subassembly 6 is close to the 2 lateral walls of supporting seat is provided with discharge gate 7 for collect the fragrant pear that the cover bag was accomplished.

In this embodiment, the classifying component 3 includes a fixed disk 31, a classifying disk 33, an arc-shaped baffle 34 and a classifying port 35, wherein the fixed disk 31 is fixed on the upper end surface of the supporting seat 2 by using an upright column 32, the classifying disk 33 is coaxially and rotatably arranged inside the fixed disk 31, the center position of the classifying disk 33 is fixed at the output end of a classifying motor, the classifying disk 33 is of a conical table structure, and the classifying motor is fixed on the upper end surface of the supporting seat 2;

a plurality of arc-shaped baffles 34 are arranged on the circumference of one side of the fixed disc 31 close to the grading disc 33 at equal intervals, and a plurality of grading openings 35 are formed between the arc-shaped baffles 34.

As a preferred embodiment, an inclined plane inclined to a side away from the classifying tray 33 is formed on the upper end surface of the fixed tray 31, the classifying ports 35 are fixed on the inclined plane to facilitate the entry of the bergamot pears, and the paper supply assemblies 4 are correspondingly arranged below the classifying ports 35, it should be noted that the wrapping paper on the paper supply assemblies 4 is supplied by an external mechanical arm and a suction cup, so that the degree of automation is improved;

air bags 36 are symmetrically fixed at the inlets of the grading ports 35, the distances between the air bags 36 are sequentially increased according to the rotating direction of the grading disc 33, and it is noted that the maximum distance between the air bags 36 is slightly smaller than the volume of the minimum bergamot pear, so that the minimum bergamot pear is prevented from entering, and the grading accuracy is improved;

the upper end faces of the grading ports 35 are provided with air inlets which are communicated with the air bags 36, and the air inflow of the air inlets is in direct proportion to the distance between the air bags 36, namely, the larger the distance between the air bags 36 is, the more air is in the air bags, and the small bergamot pears are prevented from entering the air bags.

In a preferred embodiment, the paper feeding assembly 4 includes a rotating motor 41, a placing plate 42 and a placing groove 43, wherein the placing plate 42 is fixed to an output end of the rotating motor 41, the placing groove 43 is symmetrically formed on the placing plate 42, a plurality of adsorption holes are formed in the placing groove 43 for adsorbing the packing paper, and the placing grooves 43 correspond to the classifying openings 35.

In this embodiment, the paper wrapping assembly 5 includes a bottom plate 51, connecting plates 52, a rotating shaft 53 and pressing pieces 54, wherein at least three connecting plates 52 are arranged on the circumference of the upper end surface of the bottom plate 51, the rotating shaft 53 is rotatably arranged in the connecting plates 52, the pressing pieces 54 are fixed on the rotating shaft 53, and the pressing pieces 54 can press the bergamot pear wrapping paper to make the wrapping paper adhere to the bergamot pear.

As a preferred embodiment, a bergamot pear outlet is formed in the center of the bottom plate 51 and used for sending out bergamot pears, and a torsion spring is sleeved on the rotating shaft 53 and can provide reset power for the pressing piece 54, that is, when the bergamot pears fall into the paper wrapping component 5, the pressing piece 54 deflects through the weight of the bergamot pears and resets through the torsion spring, so that the bergamot pears are always in contact with the bergamot pears, and the integrity of wrapping is improved.

In a preferred embodiment, an auxiliary pressing block 55 is fixed at one side of the top ends of the pressing pieces 54 close to each other, and an arc-shaped surface is arranged at one side of the auxiliary pressing block 55, so that the packing paper can be better attached to the bergamot pear;

one side of the bottom of the pressing piece 54, which is close to each other, is provided with a pressing surface 56, the pressing surface 56 is provided with an arc chamfer for preventing damage of the bergamot pear, and the distance between the pressing surfaces 56 is smaller than the distance between the pressing blocks 55.

In this embodiment, the netting assembly 6 includes a fixed plate 61, a side plate 62, an expansion link 64, a sliding plate 65, a lifting ring 66, a buffer cutting seat 67 and a conveying column 68, wherein the side plate 62 is symmetrically fixed on the upper end surface of the fixed plate 61, a sliding groove 63 is formed in the side plate 62, the sliding plate 65 is slidably arranged in the sliding groove 63, the sliding plate 65 is driven by the expansion link 64 fixed in the side plate 62, specifically, a foam net is sleeved on the outer wall of the conveying column 68, the foam net is made of an elastic material and can be automatically contracted after being cut, so as to wrap the bergamot pear;

one end of the sliding plate 65 obliquely extends out of the side plate 62 and is fixed by a lifting ring 66, a conveying column 68 is coaxially arranged inside the lifting ring 66, a buffering cutting seat 67 is coaxially and slidably arranged inside the conveying column 68, and a buffering spring is arranged between the buffering cutting seat 67 and the conveying column 68.

As a preferred embodiment, a plurality of lifting bins are arranged in the lifting ring 66 close to the inside of the conveying column 68 along the radial direction of the conveying column 68, lifting wheels 661 are rotatably arranged in the plurality of lifting bins, a plurality of lifting hooks are arranged on the lifting wheels 661, the lifting hooks are arc-shaped structures, and the concave positions of the arc-shaped structures of the lifting hooks face the lifting direction;

a limiting member 662 is rotatably arranged in the plurality of lifting bins, one side, away from the lifting wheels 661, of the limiting member 662 is hinged to one end of a sliding column 663, the other end of the sliding column 663 is slidably arranged in the lifting ring 66, it should be noted that the limiting member 662 can limit the lifting wheels 661 to rotate when lifted, and when the lifting wheels 661 moves downwards, friction with the foam net can be reduced through rotation, so that damage to the foam net is prevented.

In a preferred embodiment, a plurality of cutting knives 671 are rotatably disposed in the buffer cutting seat 67, a cutting spring 672 is disposed between the cutting knives 671 and the buffer cutting seat 67, a cutting opening 681 is disposed at a position of the conveying column 68 corresponding to the cutting knives 671, and a cutting edge of the cutting knife 671 extends out of the buffer cutting seat 67 and is located inside the cutting opening 68.

The working principle is as follows: the bergamot pears are conveyed into the grading component 3 through the conveying belt 1, when the bergamot pears are graded, the bergamot pears move along the arc-shaped baffle 34 through the rotation of the grading disc 33, when the bergamot pears move to the grading port 35, the bergamot pears fall into the corresponding grading port 35 according to the size of the grading port 35 and the amount of gas in the air bag 36, the grading accuracy of the bergamot pears is improved, the packing paper on the paper supply component 4 is brought into the paper wrapping component 5 through the weight of the bergamot pears, at the moment, the rotary motor 41 drives the placing plate 42 to rotate 180 degrees, the other placing groove with the packing paper is positioned below the grading port 35, the paper wrapping component 5 presses the packing paper through the pressing piece 54, so that the packing paper is attached to the surface of the bergamot pears, the integrity of the packing paper to the bergamot pears is improved, then the bergamot pears with the packing paper fall into the netting component 6, the packing paper is fixed through a foam net, when the netting component 6, buffering cutting seat 67 cushions the whereabouts of bergamot pear, and buffering cutting seat 67 is slided downwards in the buffering, and cutting spring 672 pops out cutting knife 671, cuts the foam net, and after the cutting was accomplished, the bergamot pear passes through discharge gate 7 and sees off, and telescopic link 64 downwardly movement, and hook the foam net through the lifting wheel 661 in the lift ring 66, upwards promote and strut the foam net through telescopic link 64 upward movement, the cover bag of the next bergamot pear of being convenient for.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a quick bagging apparatus of bergamot pear receipts goods, includes conveyer belt (1), supporting seat (2), grading subassembly (3), paper supply subassembly (4), package paper subassembly (5), cover net subassembly (6) and discharge gate (7), wherein, one side of supporting seat (2) is provided with conveyer belt (1), its characterized in that:

the up end of supporting seat (2) is provided with grading subassembly (3), the below circumference cloth of grading subassembly (3) is equipped with a plurality of paper supply subassemblies (4), and is a plurality of the below correspondence of paper supply subassembly (4) is provided with package paper subassembly (5), the lower extreme of package paper subassembly (5) is to being fixed with cover net subassembly (6), just cover net subassembly (6) are located inside supporting seat (2), the lopsidedness that cover net subassembly (6) are close to supporting seat (2) lateral wall is provided with discharge gate (7) for collect the fragrant pear that the cover bag was accomplished.

2. The quick bagging device for receiving bergamot pears, as claimed in claim 1, wherein: the grading component (3) comprises a fixed disc (31), a grading disc (33), an arc-shaped baffle (34) and a grading opening (35), wherein the fixed disc (31) is fixed on the upper end face of the supporting seat (2) through an upright post (32), the grading disc (33) is coaxially and rotatably arranged in the fixed disc (31), the center of the grading disc (33) is fixed at the output end of a grading motor, the grading disc (33) is of a conical table structure, and the grading motor is fixed on the upper end face of the supporting seat (2);

the fixed disc (31) is close to one side circumference of the grading disc (33) and is provided with a plurality of arc-shaped baffles (34) at equal intervals, and a plurality of grading openings (35) are formed between the arc-shaped baffles (34).

3. The quick bagging device for receiving bergamot pears, as claimed in claim 2, wherein: an inclined plane inclined towards one side far away from the grading disc (33) is formed in the upper end face of the fixed disc (31), the grading openings (35) are fixed on the inclined plane, so that fragrant pears can conveniently enter, and paper supply assemblies (4) are correspondingly arranged below the grading openings (35);

air bags (36) are symmetrically fixed at inlets of the grading ports (35), and the distances among the air bags (36) are sequentially increased according to the rotating direction of the grading disc (33);

air inlets are formed in the upper end faces of the grading ports (35), the air inlets are communicated with the air bags (36), and the air inflow of the air inlets is in direct proportion to the distance between the air bags (36).

4. The quick bagging device for receiving bergamot pears, as claimed in claim 3, wherein: the paper supply assembly (4) comprises a rotating motor (41), a placing plate (42) and a placing groove (43), wherein the placing plate (42) is fixed at the output end of the rotating motor (41), the placing groove (43) is symmetrically formed in the placing plate (42), a plurality of adsorption holes are formed in the placing groove (43) and used for adsorbing packing paper, and the placing groove (43) corresponds to the grading opening (35).

5. The quick bagging device for receiving bergamot pears, as claimed in claim 1, wherein: the paper wrapping assembly (5) comprises a bottom plate (51), connecting plates (52), a rotating shaft (53) and pressing pieces (54), wherein at least three connecting plates (52) are distributed on the circumference of the upper end face of the bottom plate (51), the rotating shaft (53) is rotatably arranged in the connecting plates (52), the pressing pieces (54) are fixed on the rotating shaft (53), and the pressing pieces (54) can press the bergamot pear packing paper to enable the packing paper to be attached to the bergamot pear.

6. The quick bagging device for receiving bergamot pears, as claimed in claim 5, wherein: the central position of bottom plate (51) has seted up the bergamot pear export for the seeing-out of bergamot pear, cup joint torsion spring on pivot (53), can provide reset power for pressing piece (54).

7. The quick bagging device for receiving bergamot pears, as claimed in claim 6, wherein: an auxiliary pressing block (55) is fixed at one side of the top end of the pressing piece (54) close to each other, and an arc-shaped surface is arranged at one side of the auxiliary pressing block (55) so that the packaging paper can be better attached to the bergamot pears;

one side of the bottom of each pressing piece (54) close to each other is provided with a pressing surface (56), each pressing surface (56) is provided with an arc chamfer for preventing damage of the bergamot pears, and the distance between every two pressing surfaces (56) is smaller than that between every two pressing blocks (55).

8. The quick bagging device for receiving bergamot pears, as claimed in claim 1, wherein: the netting assembly (6) comprises a fixed plate (61), a side plate (62), a telescopic rod (64), a sliding plate (65), a lifting ring (66), a buffering cutting seat (67) and a conveying column (68), wherein the side plate (62) is symmetrically fixed on the upper end face of the fixed plate (61), a sliding groove (63) is formed in the side plate (62), the sliding plate (65) is arranged in the sliding groove (63) in a sliding mode, and the sliding plate (65) is driven by the telescopic rod (64) fixed in the side plate (62);

one end of the sliding plate (65) obliquely extends out of the side plate (62) and is fixed by a lifting ring (66), a conveying column (68) is coaxially arranged inside the lifting ring (66), a buffering cutting seat (67) is coaxially and slidably arranged inside the conveying column (68), and a buffering spring is arranged between the buffering cutting seat (67) and the conveying column (68).

9. The quick bagging device for receiving bergamot pears, as claimed in claim 8, wherein: a plurality of lifting bins are arranged in the lifting ring (66) close to the conveying column (68) along the radial direction of the conveying column (68), lifting wheels (661) are rotatably arranged in the lifting bins, a plurality of lifting hooks are arranged on the lifting wheels (661), the lifting hooks are arc-shaped, and the concave positions of the arc-shaped structures of the lifting hooks face the lifting direction;

a limiting piece (662) is rotatably arranged in the lifting bins, one side, far away from the lifting wheel (661), of the limiting piece (662) is hinged with one end of a sliding column (663), and the other end of the sliding column (663) is slidably arranged in the lifting ring (66).

10. The quick bagging device for receiving bergamot pears, as claimed in claim 8, wherein: the interior rotatable a plurality of cutting knife (671) that are provided with of buffering cutting seat (67), be provided with cutting spring (672) between cutting knife (671) and buffering cutting seat (67), cut-off (681) have been seted up to transport post (68) and cutting knife (671) corresponding position, the cutting edge of cutting knife (671) extends buffering cutting seat (67) and is located cut-off (68) inside.