Flexible pouch forming machine and pouch thereof

Abstract

The present application relates to the field of bag forming equipment, and discloses a flexible bag forming machine and a bag thereof. The flexible bag forming machine comprises a sheet material conveying path output by a material roll; front and rear scrap removal devices and left and right scrap removal devices are sequentially arranged on the sheet material conveying path; the front and rear scrap removal devices comprise a longitudinal cutter and a longitudinal cutter pad corresponding in position and capable of being lifted relative to each other, the longitudinal cutter is located on both sides perpendicular to the sheet material conveying direction, and is used for cutting off the scrap on both sides of the sheet material in the longitudinal direction; the flexible bag forming machine further comprises a sheet material cutting device, a scrap removal device, and a flanging and welding device, a sheet-shaped pressing die is arranged above the working platform of the flanging and welding device, and a welding head is arranged for welding the overlapping portions of the two sides of the sheet material folded into a trapezoidal shape. The present application utilizes a production line to produce bags, accurately removes scrap from four corner portions by cross scrap removal, and separates the scrap by a driving member, which is conducive to the neatness of the production environment and realizes full-process automatic operation from the original roll material to the finished bag.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bag forming equipment, in particular to a flexible bag forming machine and a bag thereof. BACKGROUND

[0002] In the packaging industry, bags made of flexible materials, especially woven bags, are widely used in the fields of grain, chemical industry, building materials, etc. due to their high strength, low cost, and reusability. Traditional bags are mostly rectangular flat bags or simply stitched bags, which have problems such as unstable filling, difficult stacking, poor compression resistance, etc. In recent years, with the development of logistics and warehousing automation, the market demand for bags with stable bottom surface, strong self-standing performance, and foldable storage, such as "boat-shaped" or "hexahedral" structure, has been increasing. Such bags can be connected to an upper cover with a zipper or other ways of opening and closing on top, thereby serving as a carrying function, especially in the fields of clothing, bedding packaging, and storage.

[0003] In the prior art, the forming process of the bag usually includes processes such as unwinding, slitting, and edge sealing. Each link is arranged separately, and the last edge stitching of the woven bag relies on manual operation to stitch the connecting part of the bag. It is difficult to ensure precision and consistency, and the work efficiency is low.

[0004] In addition, if the corner waste generated during the processing of the sheet material cannot be effectively removed in time, it may cause equipment jamming and cannot adapt to high-speed continuous production lines. Currently, there is a lack of a fully automatic forming system that integrates longitudinal and transverse waste removal, automatic waste removal, flanging, and welding in one, resulting in high production cost of high-end bags.

[0005] Therefore, there is an urgent need to provide a flexible bag forming machine that integrates efficient waste removal, precise cutting, intelligent waste removal, and automatic flanging and welding in one, to solve the above problems, and to support the generation of a boat-shaped bag with novel structure and stable forming. SUMMARY

[0006] The present application provides a flexible bag forming machine and a bag thereof to overcome the shortcomings of the prior art.

[0007] The present application solves the above technical problems by the following technical solutions:

[0008] The flexible bag forming machine comprises a sheet material conveying path output from a material roll; a front and rear waste removal device and a left and right waste removal device are sequentially arranged on the sheet material conveying path; the front and rear waste removal device comprises a longitudinal cutter and a longitudinal cutter pad corresponding in position and capable of lifting relative to each other, the longitudinal cutter is located on both sides perpendicular to the conveying direction of the sheet material, and is used for cutting off the waste on both sides of the sheet material in the longitudinal direction; the left and right waste removal device comprises a transverse cutter and a transverse cutter pad corresponding in position and capable of lifting relative to each other, the transverse cutter is located on both sides perpendicular to the conveying direction of the sheet material, and is used for cutting off the waste on both sides of the sheet material in the transverse direction, so that the sheet material is in a cross shape.

[0009] The flexible bag body forming machine further comprises a sheet material cutting device integrated with the left and right scrap removing devices or located downstream of the left and right scrap removing devices, the sheet material cutting device comprising a cutter for cutting the continuously conveyed sheet material into single sheet materials, a transverse cutter, a cutter shared tool or a cutter with another tool located downstream of the left and right scrap removing devices;

[0010] The flexible bag body forming machine further comprises a scrap removing device integrated with the left and right scrap removing devices or located downstream of the left and right scrap removing devices, the scrap removing device comprising a driving member for separating the scrap from the sheet material conveying path;

[0011] The flexible bag body forming machine further comprises a flanging and welding device, the flanging and welding device comprising a flanging assembly, the flanging assembly comprising a work platform for laying the single sheet material, a sheet-shaped die being arranged above the work platform, and a welding head for welding the overlapped portions of the two sides of the sheet material folded into a trapezoidal shape, one side of the die forming a trapezoidal fold line, the shape of the trapezoidal fold line matching the edge shape of the side of the bottom surface of the sheet material after forming; the work platform and the die are horizontally movable relative to each other to enable the die to be separated from the cavity on one side of the bag body after welding is completed, the welding head and the die being respectively connected to a power source for driving the lifting thereof, the side edges of the work platform being provided with a positive flanging member, the two sides of the positive flanging member being respectively provided with side flanging members, the side flanging members and the positive flanging member respectively moving along a straight line or an arc to fold the sheet material inward along the edges of the upper bottom and the two inclined sides of the bag body die to fold the sheet material on one side corresponding to the die into a trapezoidal shape, wherein the sheet material folded by the positive flanging member has an overlapped portion with the sheet material folded by the two side flanging members. The flanging and welding device realizes full-process automatic operation from the original roll material to the finished bag body, significantly improving the production efficiency. The front and rear scrap removing devices and the left and right scrap removing devices are arranged step by step, and the positions of the scrap removing devices can be changed according to the size of the bag body, thereby avoiding the increase in cost caused by die cutting and replacement of die.

[0012] Preferably, the die and the welding head above the work platform have at least two groups, one group corresponding to one side of the two longitudinal sides of the sheet material, and the other group corresponding to the other side of the longitudinal front and rear of the sheet material.

[0013] Preferably, the die above the work platform is one group, the die and the work platform are relatively rotatable, and the die and the work platform have a first state and a second state after relative rotation. In the first state, the die corresponds to one side of the two longitudinal sides or one side of the two transverse sides of the sheet material on the work platform. In the second state, the die corresponds to the other side of the two sides of the sheet material on the work platform.

[0014] Preferably, if the die is rotatable, the two sides of the work platform are provided with positive flanging members, side flanging members and welding heads. If the work platform is rotatable, the two sides of the work platform are provided with positive flanging members and side flanging members, and the positive flanging members and the side flanging members are connected to the work platform and rotate together.

[0015] As preferred, the sheet material transfer device is arranged between the sheet material cutting device and the hemming welding device, and the sheet material transfer device is arranged to move the sheet material to the hemming welding device by suction or / and clamping,

[0016] As preferred, a pressing plate is further arranged to be movable relative to the transverse knife pad for pressing the sheet material on the transverse knife pad when the sheet material is cut and removed from the left and right sides, and the pressing plate is provided with a knife slot for the transverse cutter to pass through. The pressing plate presses the sheet material during cutting to prevent shaking or deviation and ensure the cutting edge is neat, and the knife slot is designed to allow the cutter to pass through the pressing plate without being hindered.

[0017] As preferred, a conveying belt is arranged on the outside or above the transverse knife pad, and the conveying belt is provided with suction holes connected to a negative pressure source; the conveying belt and the transverse knife pad are connected to a horizontal moving force source, and the transverse knife pad is located below the sheet material when the transverse cutter cuts the sheet material and the transverse cutter does not contact the conveying belt, and the conveying belt is located below the sheet material when the sheet material is conveyed forward. The conveying belt sucks the bag body during the conveying stage, especially the part remaining after the waste is cut, to prevent it from being raised to affect the subsequent processing, and the conveying belt moves horizontally during the cutting of the transverse cutter to avoid the cutter contacting the conveying belt and damaging the belt.

[0018] As preferred, the waste removal device includes a waste collection cavity below the sheet material conveying path, and a driving member is arranged above the waste collection cavity to act on the waste and provide movement of the waste towards the waste collection cavity. The driving member actively removes the waste, which can be removed by blowing, pushing or suction, or a combination of the above methods. This active waste removal is more reliable than passive falling, which prevents the waste from being slightly connected or remaining in the original position after being cut by the cutter.

[0019] As preferred, the driving member includes a blowing head above the sheet material conveying path or / and a push head that can move up and down above the sheet material conveying path.

[0020] As preferred, the waste removal device is integrated on the left and right waste removal devices, and the transverse knife pads on the front and rear sides of the conveying direction have a passage for the waste to pass downward, and the waste collection cavity is located below the passage when the transverse cutter cuts the sheet material.

[0021] As preferred, the longitudinal cutter moves relative to the continuously conveyed sheet material along the conveying direction, and the transverse cutter moves relative to the continuously conveyed sheet material for transversely cutting the waste. The relative movement design allows the longitudinal cutter to complete the cutting of the conveyed sheet material without stopping, or the sheet material can be stationary and the cutter moves to cut the sheet material when the machine is stopped.

[0022] As preferred, the sheet material is conveyed longitudinally, and the transverse cutter can reciprocate perpendicular to the conveying direction for transversely cutting the waste.

[0023] Preferably, the left and right scrap removing device comprises a crossbeam, a transversely extending guide rail is arranged on the crossbeam, a sliding block is arranged on the guide rail in a sliding mode, and the transversely cutting knife is connected with the sliding block.

[0024] Preferably, the sliding block on the guide rail is respectively provided with a transversely cutting knife in front and behind, and the transversely cutting knives in front and behind cut the front and rear edges of the scrap in a transverse mode. The electric or pneumatic drive is easy to realize, the PLC control system is convenient to connect, the guiding precision is high, and the two-side scrap removing is symmetrical.

[0025] Preferably, the output conveying belt is arranged downstream of the flanging and welding device, and the flanging and welding device is provided with a horizontally reciprocating bag pulling mechanism.

[0026] The bag body is formed by a flexible bag body forming machine, and comprises a body. The body comprises a bottom surface. The bottom surface extends in front and back to form a front flange part. The bottom surface extends in left and right to form a side flange part. The side flange part is adjacent to the front flange part. The side flange part and the front flange part have a scrap part therebetween. The front and back of the side flange part are inwardly folded at an oblique angle. The front flange part is inwardly folded forwardly. The scrap part is located below the front flange part or covers the front flange part after being inwardly folded at the oblique angle. The scrap part and the front flange part have an overlapping part for connection. The body forms a hexagonal or octagonal boat shape. The body has an inner cavity with opposite openings on the front and back. The scrap part and the front flange part are welded to form a double-sealing structure. The double-sealing structure is beneficial to dense stacking and saves storage space. The structure design is convenient for subsequent sealing by equipment or manual operation.

[0027] The present application has the following technical effects:

[0028] The flange is guided by the trapezoidal fold line on the die, so that each piece of material is folded according to the preset track, the forming error is small, and the yield is high.

[0029] High integration and automation The whole process from unwinding to finished product output is free of human intervention, which greatly reduces labor cost. The precision of scrap forming, flanging and welding is high, which ensures accurate execution of each process and product yield.

[0030] The cross-shaped scrap removal accurately removes the scrap at four corner parts. The scrap is separated by the driving member, which is beneficial to the cleanliness of the production environment. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the present application;

[0032] Figure 2 is a structural schematic diagram of the present application from another angle;

[0033] Figure 3 is a structural schematic diagram of the bag body formed from a piece of material;

[0034] Figure 4 is a structure schematic diagram of the front and rear scrap removing device, the left and right scrap removing device, and the sheet material cutting device connected in line;

[0035] Figure 5 is Figure 4 a structure schematic diagram from another angle;

[0036] Figure 6 is a structure schematic diagram of the left and right scrap removing device;

[0037] Figure 7 is Figure 6 a structure schematic diagram from another angle;

[0038] Figure 8 is a structure schematic diagram of the turn-up welding device.

[0039] The part names referred to by the numbers in the above drawings are as follows:

[0040] 1, front and rear scrap removing device; 11, longitudinal cutter; 12, longitudinal cutter pad;

[0041] 2, left and right scrap removing device; 21, horizontal cutter; 22, horizontal cutter pad; 23, conveying belt; 24, negative pressure source; 25, channel; 26, crossbeam; 27, guide rail; 28, sliding block; 29, pressing plate; 291, cutter groove;

[0042] 3, sheet material cutting device; 31, cutter;

[0043] 41, driving member;

[0044] 5, turn-up welding device; 51, working platform; 52, pressing die; 521, trapezoidal fold line; 53, front turn-up member; 54, side turn-up member; 55, welding head;

[0045] 61, waste collecting cavity;

[0046] 7, sheet material transferring device;

[0047] 8, material roll; 81, output conveying belt;

[0048] 9, body; 91, bottom surface; 92, front turn-up part; 93, side turn-up part. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in combination with the drawings and examples.

[0050] Example 1

[0051] A flexible bag body forming machine, such as Figures 1-2As shown, the flexible bag body forming machine comprises a sheet material conveying path output by a roll 8; a front and rear scrap removal device 1 and a left and right scrap removal device 2 are sequentially arranged on the sheet material conveying path; the front and rear scrap removal device 1 comprises a longitudinal cutter 11 and a longitudinal cutter pad 12 corresponding in position and capable of lifting relative to each other, the longitudinal cutter 11 is located on both sides perpendicular to the conveying direction of the sheet material, and is used for cutting off the scrap on both sides of the sheet material in the longitudinal direction; the left and right scrap removal device 2 comprises a transverse cutter 21 and a transverse cutter pad 22 corresponding in position and capable of lifting relative to each other, the transverse cutter 21 is located on both sides perpendicular to the conveying direction of the sheet material, and is used for cutting off the scrap on both sides of the sheet material in the transverse direction, so that the sheet material is in a cross shape.

[0052] As shown in the drawings, Figure 4 The flexible bag body forming machine further comprises a sheet material cutting device 3, which is integrated on the left and right scrap removal device 2 or located downstream of the left and right scrap removal device 2, and the sheet material cutting device 3 comprises a cutter 31 for cutting the continuously conveyed sheet material into single sheet materials, the transverse cutter 21 and the cutter 31 share part of the cutter or the cutter 31 is provided with another cutter and located downstream of the left and right scrap removal device 2.

[0053] As shown in the drawings, Figure 5 The flexible bag body forming machine further comprises a scrap removal device, which is integrated on the left and right scrap removal device 2 or located downstream of the left and right scrap removal device 2, and the scrap removal device comprises a driving member 41 for separating the scrap from the sheet material conveying path.

[0054] As shown in the drawings, Figure 8 The flexible bag body forming machine further comprises a flanging and welding device 5, the flanging and welding device 5 comprises a flanging assembly, the flanging assembly comprises a work platform 51 for laying the single sheet material, a sheet-shaped die 52 is arranged above the work platform 51, and a welding head 55 is arranged for welding the overlapping parts of the two sides of the sheet material folded into a trapezoidal shape, one side of the die 52 forms a trapezoidal fold line 521, and the shape of the trapezoidal fold line 521 matches the edge shape of the bottom side of the sheet material after forming; the work platform 51 and the die 52 can move horizontally relative to each other to make the die 52 separate from the cavity on one side of the bag body welding completion, the welding head 55 and the die 52 are respectively connected with a power source for driving them to lift, the side edge of the work platform 51 is provided with a positive flanging member 53, the two sides of the positive flanging member 53 are respectively provided with side flanging members 54, and the side flanging members 54 and the positive flanging member 53 respectively fold the sheet material inward along the edges of the upper bottom and two inclined edges of the bag body die 52 to fold the sheet material on one side corresponding to the die into a trapezoidal shape, wherein the sheet material folded by the positive flanging member 53 has an overlapping part with the sheet material folded by the side flanging members 54 on both sides.

[0055] As shown in the drawings, Figures 6-7As shown in the figure, the longitudinally movable cutting knife 11 and the longitudinal knife pad 12, the transversely movable cutting knife 21 and the transverse knife pad 22 are generally the transversely movable cutting knife 21 and the longitudinally movable cutting knife 11 connected to the lifting power source, but can also be the longitudinal knife pad 12 and the transverse knife pad 22 connected to the lifting power source. The lifting power source can be a cylinder arranged on the cutting tool, or a cylinder or motor connected to the mounting seat where the longitudinally movable cutting knife 11 and the transversely movable cutting knife 21 are located, and can cooperate with a servo drive system to realize accurate setting of the lifting timing of the longitudinally movable cutting knife 11 and the transversely movable cutting knife. As one of the embodiments, the longitudinally movable cutting knife 11 and the transversely movable cutting knife 21 can be rotating circular knives, but the conveying direction must be in the same direction as the line to be cut. As another embodiment, the longitudinally movable cutting knife 11 moves relative to the continuously conveyed sheet material along the conveying direction, and the transversely movable cutting knife 21 moves relative to the continuously conveyed sheet material to cut off the waste material transversely.

[0056] One of the embodiments of the relative movement of the transversely movable cutting knife 21 and the continuously conveyed sheet material is as follows: the sheet material is conveyed longitudinally, and the transversely movable cutting knife 21 reciprocates perpendicular to the conveying direction to cut off the waste material transversely. The left and right waste removing device 2 includes a cross beam 26, the cross beam 26 is provided with a transversely extending guide rail 27, a sliding block 28 is slidably arranged on the guide rail 27, and the transversely movable cutting knife 21 is connected with the sliding block 28. The sliding block 28 on the guide rail 27 is respectively provided with a transversely movable cutting knife 21 in front and back, and the front and back transversely movable cutting knives 21 cut the front and back edges of the waste material transversely.

[0057] As one of the embodiments, the die 52 and the welding head 55 above the working platform 51 have at least two groups, one of which corresponds to one side of the longitudinal two sides of the sheet material, and the other corresponds to the other side of the longitudinal front and back of the sheet material.

[0058] The sheet material transfer device 7 is provided between the sheet material cutting device 3 and the flanging and welding device 5, and moves the sheet material to the flanging and welding device 5 by suction or / and clamping,

[0059] Further comprising a pressing plate 29, the pressing plate 29 is movable relative to the transverse knife pad 22 for pressing the sheet material on the transverse knife pad 22 when the sheet material is removed left and right, and the pressing plate 29 is provided with a knife groove 291 for the transversely movable cutting knife 21 to pass through.

[0060] The outer side or upper side of the transverse knife pad 22 is provided with a conveying belt 23, the conveying belt 23 is provided with an air suction hole connected with a negative pressure source 24; the conveying belt 23 and the transverse knife pad 22 are connected with a horizontal moving power source, the transverse knife pad 22 is located below the sheet material when the transversely movable cutting knife 21 cuts the sheet material, and the transversely movable cutting knife 21 does not contact the conveying belt 23, and the conveying belt 23 is located below the sheet material when the sheet material is conveyed forward.

[0061] The waste removal device includes a waste collection chamber 61 below the sheet material conveying path, and a drive member 41 is provided above the waste collection chamber 61 to act on the waste and provide the waste to move toward the waste collection chamber 61.

[0062] The drive unit 41 includes an air blowing head located above the sheet conveying path and / or a pusher head located above the sheet conveying path that can move up and down.

[0063] The waste removal device is integrated on the left and right waste removal devices 2. There is a channel 25 between the transverse blade pads 22 on the front and rear sides of the conveying direction for waste to pass downward. The waste collection chamber 61 is located below the channel 25 when the transverse cutter 21 cuts the sheet material.

[0064] It also includes an output conveyor belt 81, which is located downstream of the flanging welding device 5. There is a bag pulling mechanism that can reciprocate horizontally between the output conveyor belt 81 and the flanging welding device 5.

[0065] Working principle:

[0066] A. The sheet material is guided into the sheet material conveying path by the guide rollers from the material roll 8. A correction device can be set up to correct the conveying of the sheet material.

[0067] B. The sheet material is continuously conveyed longitudinally, entering the front and rear scrap removal device 1 at the beginning of the conveying path. The longitudinal cutters 11 on both sides of the front and rear scrap removal device 1, in conjunction with the lower longitudinal cutter pad 12, rise and fall relative to the longitudinal cutter pad 12, acting on the surface of the sheet material to cut the waste on both sides of the sheet material along the front-to-back direction. The longitudinal cutter pad 12 can be a single plate or a separate plate; if it is the longitudinal cutter 11, the longitudinal cutter pad 12 can also be a roller. Since the waste between the sheet material of the previous bag and the sheet material of the next bag is connected, the waste can be cut together, so each sheet material only needs to be cut once on average on both sides. The longitudinal cutter 11 can be a disc cutter that cuts the sheet material by rotation, or a cutter fixed in the front-to-back direction that cuts by the movement of the sheet material, or a cutter that can move back and forth, cutting the waste along the front-to-back direction through relative displacement with the sheet material. The waste material is left in place for subsequent processing.

[0068] C. The back piece material continues to be continuously conveyed in the longitudinal direction, and enters the left and right waste removing device 2 at the front end of the conveying path. The waste is removed before the horizontal cutter 21 is lowered for cutting, and the pressing plate 29 is pressed down to press the piece material on the upper surface of the horizontal cutter pad 22. Before the cutting is completed, the conveying belt 23 and the horizontal cutter pad 22 are transversely moved, so that the conveying belt 23 avoids the horizontal cutter 21, and the horizontal cutter pad 22 is located below the horizontal cutter 21. The horizontal cutter pad 22 cooperates with the horizontal cutter 21 to cut the waste material at the four corners of the piece material. The horizontal cutter 21 is a cutter installed on the guide rail 27, and the horizontal cutter 21 moves transversely relative to the piece material, so as to cut off the waste material.

[0069] D. The piece material enters the waste removing device, which can be located on the left and right waste removing device 2, or downstream of the left and right waste removing device 2. The cut waste material is moved downward by a driving member, which can be one or more of a gas blowing head above the piece material, a push head that can move up and down above the piece material conveying path, and a suction head below the piece material conveying path. After the waste is removed by the waste removing device, the conveying belt 23 sucks the piece material, especially the part of the side piece from which the waste has been removed. The conveying belt and the conveying roller jointly drive the continuous piece material to move forward, so that the piece material remains flat and flat.

[0070] E. The continuously conveyed piece material is cut into single piece materials by the piece cutting device 3. The piece cutting device 3 includes a cutter 31. If the piece cutting device 3 is integrated on the left and right waste removing device 2, the cutter 31 can be moved left and right by part of the horizontal cutter 21. If the piece cutting device 3 is located downstream of the left and right waste removing device 2, the left and right waste removing device 2 is provided with another cutter, which uses up-down pressing cutting or cutting provided on the guide rail or ultrasonic cutting to cut the piece material.

[0071] F. The piece material transfer device 7 moves the piece material from the piece cutting device 3 to the edge welding device 5 by suction or / and clamping.

[0072] Clamping can clamp the side edge or front edge of the piece material, and the suction method can act on the upper surface of the bag piece material. The piece material transfer device 7 at least has longitudinal movement, and can also have lifting movement.

[0073] G. The side of the working platform is provided with a front edge turning member 53, and the left and right sides of the front edge turning member 53 are provided with side edge turning members 54.

[0074] The two sets of press dies 52 and welding heads 55 are respectively arranged at the two ends of the work platform. The positions of the straight flanging members 53 and the side flanging members 54 on the work platform 51 are not limited, and the front and rear sets of straight flanging members 53 and side flanging members 54 can act on the opposite sides of the bag body, such as the front and rear sides or the left and right sides. The straight flanging members are longitudinally pushed, the press dies 52 are pressed down to one side of the sheet material where the flanging and welding are required, the first set of straight flanging members 53 and side flanging members 54 act first to fold the edge of the sheet material inward along the outer periphery of the press die 52. The straight flanging members 53 can act before or after the folding action of the side flanging members 54. When the bag is folded, the edge along the outer side of the press die 52 and the two waist lines are folded up as the folding lines 521. Then, the press die 52 is kept in the folded state, and the welding head 55 is pressed down to weld the positions corresponding to the two high lines of the trapezoid, so as to fix the side of the bag body. Then, the press die 52 is transversely moved out of the bag body towards the middle and is lifted up. The bag body is conveyed to the next work station, and the second set of press dies 52, straight flanging members 53, side flanging members 54 and welding heads 55 act on the other side of the bag body in the same way to weld and form a six- or eight-sided bag body. When the bag body is unfolded, it has a side wall around the circumference, a square bottom surface and an upward opening.

[0075] After the welding is completed, the bag pulling mechanism is horizontally extended to hook or adsorb the bag opening and pull it out to the output conveyor belt 81. The conveyor belt sends the finished product to the next process, such as stacking, detection and packaging.

[0076] Embodiment 2

[0077] The difference between the embodiment 1 and the embodiment 2 is that the press die 52 above the work platform 51 is a set, and the press die 52 and the work platform 51 can be relatively rotated. The press die 52 and the work platform 51 have a first state and a second state after being relatively rotated. In the first state, the press die 52 corresponds to one side of the longitudinal two sides or one side of the transverse two sides of the sheet material on the work platform 51. In the second state, the press die 52 corresponds to the other side of the two sides of the sheet material on the work platform 51.

[0078] If the press die 52 is rotatable, the straight flanging members 53, the side flanging members 54 and the welding heads 55 are arranged on both sides of the work platform 51. If the work platform is rotatable, the straight flanging members 53 and the side flanging members 54 are arranged on both sides of the work platform 51, and the straight flanging members 53 and the side flanging members 54 are connected with the work platform 51 and rotate together.

[0079] The difference between the step G and the embodiment 2 is that after the folding and welding of the first side are completed, the folding and welding of the other side of the bag body are performed on the same work station.

[0080] One implementation method is as follows: a set of front flanging parts 53, side flanging parts 54, and welding heads 55 are respectively set on both sides of the working platform. The working platform rises, rotates, and falls, causing the bag to rotate 180°.

[0081] The second implementation method is as follows: the front flange 53 and the side flange 54 are connected to the working platform. The working platform, together with the front flange 53 and the side flange 54, rises, rotates and falls together, so that the bag body rotates 180°.

[0082] The third implementation method is as follows: the front flange 53, the side flange 54 and the working platform remain stationary. After the pressing mold 52 is welded at the first station, it is pulled out laterally and rotated 180° to the other side to the position corresponding to the bag body.

[0083] Example 3

[0084] like Figure 3 Figure 4 As shown, the bag body is formed by a flexible bag forming machine and includes a body 9. The body 9 includes a bottom surface 91. The bottom surface 91 extends front and back to form a front folded edge 92 and extends left and right to form a side folded edge 93. The side folded edge 93 is adjacent to the front folded edge 92. There is a waste section between the side folded edge 93 and the front folded edge 92. The front and back sides of the side folded edge 93 are folded inward at an angle. The front folded edge 92 is folded inward at a straight angle. After the angled inward fold, it is located below or covers the front folded edge 92. There is an overlapping part between the two for connection, so that the body 9 is formed into a hexagonal or octagonal boat shape. The front and back sides of the body 9 have internal cavities with openings facing each other.

[0085] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0086] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A flexible bag forming machine, characterized in that, include The sheet material conveying path output from the roll (8); The sheet material conveying path is equipped with front and rear waste removal devices (1) and left and right waste removal devices (2) in sequence. The front and rear waste removal device (1) includes a longitudinal cutter (11) and a longitudinal cutter pad (12) that are positioned correspondingly and can be raised and lowered relative to each other. The longitudinal cutter (11) is located on both sides perpendicular to the sheet material conveying direction and is used to longitudinally cut off the waste material on both sides of the sheet material. The left and right waste removal device (2) includes a transverse cutter (21) and a transverse cutter pad (22) that are positioned and can be raised and lowered relative to each other. The transverse cutter (21) is located on both sides perpendicular to the sheet material conveying direction and is used to cut the waste material on both sides of the sheet material laterally so that the sheet material is in a cross shape. It also includes a sheet cutting device (3), which is integrated on the left and right scrap removal device (2) or the sheet cutting device is located downstream of the left and right scrap removal device (2). The sheet cutting device (3) includes a cutter (31) for cutting the continuously conveyed sheet into single sheets. The transverse cutter (21) and the cutter (31) share some of the cutting tools or the cutter (31) has a separate cutting tool and is located downstream of the left and right scrap removal device (2). It also includes a waste removal device, which is integrated into the left and right waste removal devices (2) or located downstream of the left and right waste removal devices (2). The waste removal device includes a drive (41) for removing waste from the sheet material conveying path. It also includes a flanging welding device (5), which includes a flanging assembly. The flanging assembly includes a working platform (51) for laying out a single sheet of material. A sheet-shaped pressing mold (52) and a welding head (55) are provided above the working platform (51) for welding the overlapping parts of the sheet material folded into a trapezoidal shape on both sides. The outer edge of one side of the pressing mold (52) forms a trapezoidal fold line (521). The shape of the trapezoidal fold line (521) matches the edge shape of the bottom surface of the sheet material after it is formed. The working platform (51) and the pressing mold (52) can move horizontally relative to each other so that the pressing mold (52) can be separated from the bag body welding. The cavity on the completed side is connected to a power source that drives its lifting and lowering, with the welding head (55) and the pressing mold (52) respectively connected. The side of the working platform (51) is provided with a front flange (53), and the two sides of the front flange (53) are respectively provided with side flanges (54). The side flanges (54) and the front flanges (53) respectively fold the sheet material inward along the bottom and the two oblique edges of the bag pressing mold (52) through straight or arc movement, folding the sheet material into a trapezoidal shape on the corresponding side of the pressing mold. The sheet material folded by the front flange (53) and the sheet material folded by the side flanges (54) on both sides have overlapping parts.

2. The flexible bag forming machine according to claim 1, characterized in that: The die (52) and welding head (55) above the work platform (51) have at least two sets, one set corresponding to one side of the longitudinal sides of the sheet material, and the other set corresponding to the other side of the longitudinal front and rear of the sheet material.

3. The flexible bag forming machine according to claim 1, characterized in that: The pressing molds (52) above the working platform (51) are a set. The pressing molds (52) and the working platform (51) can rotate relative to each other. After the pressing molds (52) and the working platform (51) rotate relative to each other, they have a first state and a second state. In the first state, the pressing molds (52) correspond to one side of the longitudinal side or one side of the transverse side of the sheet material on the working platform (51). In the second state, the pressing molds (52) correspond to the other side of the sheet material on the working platform (51). If the pressing molds (52) can rotate, the working platform (51) is provided with a front flange (53), a side flange (54), and a welding head (55) on both sides. If the worktable can rotate, the working platform (51) is provided with a front flange (53) and a side flange (54) on both sides. The front flange (53) and the side flange (54) are connected to the working platform (51) and rotate together.

4. The flexible bag forming machine according to claim 2 or 3, characterized in that: There is a sheet transfer device (7) between the flanging welding device (5) and the sheet cutting device (3), which moves the sheet to the flanging welding device (5) by means of suction and / or clamping.

5. The flexible bag forming machine according to claim 1, characterized in that: It also includes a pressure plate (29), which can move relative to the transverse blade pad (22) to press the sheet material onto the transverse blade pad (22) when scrapping from the left and right. The pressure plate (29) has a blade groove (291) through which the transverse cutter (21) passes.

6. The flexible bag forming machine according to claim 1 or 5, characterized in that: A conveyor belt (23) is provided on the outside or above the transverse blade pad (22). The conveyor belt (23) is provided with a suction hole connected to a negative pressure source (24). The conveyor belt (23) and the transverse blade pad (22) are connected to a transverse motion source. When the transverse cutter (21) cuts the sheet material, the transverse blade pad (22) is located below the sheet material and the transverse cutter (21) does not contact the conveyor belt (23). When the sheet material is conveyed forward, the conveyor belt (23) is located below the sheet material.

7. The flexible bag forming machine according to claim 1 or 5, characterized in that: The waste removal device includes a waste collection chamber (61) below the sheet material conveying path. Above the waste collection chamber (61) is a drive member (41) that acts on the waste and provides the waste to move toward the waste collection chamber (61). The drive member (41) includes an air blowing head located above the sheet material conveying path and / or a push head located above the sheet material conveying path that can move up and down. The waste removal device is integrated on the left and right waste removal devices (2). There is a channel (25) between the transverse blade pads (22) on the front and rear sides of the conveying direction for the waste to pass downward. The waste collection chamber (61) is located below the channel (25) when the transverse cutter (21) cuts the sheet material.

8. The flexible bag forming machine according to claim 1, characterized in that: The longitudinal cutter (11) moves relative to the continuously conveyed sheet material along the conveying direction, and the transverse cutter (21) moves relative to the continuously conveyed sheet material to cut the waste material laterally; the sheet material is conveyed longitudinally, and the transverse cutter (21) can reciprocate perpendicular to the conveying direction to cut the waste material laterally; the left and right waste removal device (2) includes a crossbeam (26), a transversely extending guide rail (27) is provided on the crossbeam (26), and a slider (28) is slidably provided on the guide rail (27), and the transverse cutter (21) is connected to the slider (28); the slider (28) on the guide rail (27) is equipped with transverse cutters (21) at the front and back respectively, and the transverse cutters (21) at the front and back cut the waste material laterally.

9. The flexible bag forming machine according to claim 1, characterized in that: It also includes an output conveyor belt (81), which is located downstream of the flanging welding device (5), and there is a bag pulling mechanism that can move horizontally between the output conveyor belt (81) and the flanging welding device (5).

10. The flexible bag forming machine according to any one of claims 1-3, characterized in that: The flexible bag forming machine is used to form a bag body, which includes a body (9) and a bottom surface (91). The bottom surface (91) extends in front and back to form a front folded edge (92) and extends in the left and right to form a side folded edge (93). The side folded edge (93) is adjacent to the front folded edge (92). There is a waste section between the side folded edge (93) and the front folded edge (92). The front and back sides of the side folded edge (93) are folded inward at an angle. The front folded edge (92) is folded inward at a straight angle. After the angled inward fold, it is located below the front folded edge (92) or covers the front folded edge (92). There is an overlapping part between the two for connection, so that the body (9) forms a hexagonal or octagonal boat shape. The front and back sides of the body (9) have internal cavities with openings facing each other.

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