Flanging welding device of flexible bag body forming machine

Abstract

The utility model relates to the field of bag body forming equipment, and discloses a flanging and welding device of a flexible bag body forming machine, which comprises a flanging and welding device body, the flanging and welding device body comprises a flanging assembly, and the flanging assembly comprises a working platform used for tiling a single sheet stock. A sheet-shaped pressing die and a welding head for welding overlapped parts on the two sides of a sheet material which is folded into a trapezoid are arranged above the working platform, a trapezoid fold line is formed on the outer edge of one side of the pressing die, the welding head and the pressing die are respectively connected with a power source for driving the welding head and the pressing die to ascend and descend, and a front flanging piece is arranged on the side edge of the working platform. Side flanging pieces are arranged on the two sides of the front flanging piece respectively, and the side flanging pieces and the front flanging piece fold the sheet stock inwards along the upper bottom of the bag body pressing die and the edges of the two bevel edges through linear or arc movement so that the corresponding side of the pressing die of the sheet stock can be folded into a trapezoid. The sheet material is folded along the outer trapezoidal fold line track of the pressing film, the trapezoidal fold line is matched with the outline of the bag bottom, the forming precision is improved, and the bag body yield is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bag body forming equipment, especially to the flanging and welding device of flexible bag body forming machine. BACKGROUND

[0002] In the packaging industry, the bag body of flexible material, especially the woven bag, is widely used in the fields of grain, chemical industry, building material, etc. due to its high strength, low cost, reusability and other advantages. One of the key processes of the bag body with stable standing performance such as self-standing bag and eight-edge sealing bag is to fold and heat-seal weld the bottom part of the bag in trapezoidal shape to form a structure that can support standing.

[0003] In the prior art, the forming of the bottom of the bag body is mostly completed by manual or semi-automatic method, which has the problems of low efficiency, poor consistency, unstable welding strength, etc. The final edge sewing of the woven bag relies on manual operation to sew the connecting part of the bag body. Although some automatic equipment realizes preliminary flanging and welding, it still has the problems of low flanging precision and inaccurate welding area positioning. Therefore, there is an urgent need for a flexible bag body forming device with high-precision flanging and welding to improve product quality and production automation level. SUMMARY

[0004] The utility model provides the flanging and welding device of flexible bag body forming machine in view of the shortcoming in the prior art.

[0005] The utility model solves the above-mentioned technical problem through the following technical scheme:

[0006] The flanging and welding device of the flexible bag body forming machine comprises a flanging and welding device body, the flanging and welding device body comprises a flanging assembly, the flanging assembly comprises a workbench for laying a single sheet material, a sheet-shaped die is arranged above the workbench, and a welding head is arranged for welding the overlapped parts of the sheet material folded into trapezoidal shape on both sides; the outer edge of one side of the die forms a trapezoidal fold line, and the shape of the trapezoidal fold line matches the edge shape of the bottom surface of the sheet material after forming; the workbench and the die can move horizontally relative to each other to make the die separate from the cavity on one side of the bag body after welding is completed; the welding head and the die are respectively connected with a power source for driving them to ascend and descend; the side edge of the workbench is provided with a positive flanging piece, and the two sides of the positive flanging piece are respectively provided with side flanging pieces; the side flanging pieces and the positive flanging piece fold the sheet material inward along the edges of the upper bottom and the two inclined edges of the bag body die to fold the sheet material into trapezoidal shape on one side corresponding to the die, wherein the sheet material folded by the positive flanging piece has an overlapped part with the sheet material folded by the side flanging pieces on both sides. The sheet material is folded along the outer trapezoidal fold line track of the die, the trapezoidal fold line matches the profile of the bag bottom to improve the forming precision and ensure the yield of the bag body. After flanging is completed, the overlapped area is naturally formed, and the welding head can accurately act on the area to avoid virtual welding and partial welding.

[0007] As preferred, the die above the work platform has at least two groups, one of which corresponds to one of the longitudinal sides of the sheet material, and the other corresponds to the other of the longitudinal front and back of the sheet material. Two stations can be provided, and two bag bodies can be processed simultaneously or the flanging and welding of both sides of the same bag body can be completed step by step, thereby improving processing efficiency.

[0008] As preferred, the die above the work platform is a group, and the die and the work platform can rotate relative to each other. After the die and the work platform rotate relative to each other, the die has a first state and a second state. In the first state, the die corresponds to one of the longitudinal sides or one of the transverse sides of the sheet material on the work platform. In the second state, the die corresponds to the other of the two sides of the sheet material on the work platform. The number of dies and welding assemblies is reduced, the cost and maintenance difficulty are reduced, both sides are processed by rotation, and the space layout is saved.

[0009] As preferred, if the die is rotatable, the two sides of the work platform are provided with a positive flanging member, a side flanging member, and a welding head.

[0010] As preferred, if the worktable is rotatable, the two sides of the work platform are provided with a positive flanging member and a side flanging member, and the positive flanging member and the side flanging member are connected with the work platform and rotate together.

[0011] As preferred, it further includes a sheet material transfer device, which moves the sheet material to the flanging and welding device body by suction or / and clamping, thereby improving the degree of automation of the whole line and reducing manual intervention.

[0012] As preferred, it further includes an output conveyor belt located downstream of the flanging and welding device body, and a bag pulling mechanism horizontally reciprocating between the output conveyor belt and the flanging and welding device body. The output conveyor belt receives finished products, which are convenient for entering the next process or being collected.

[0013] The above technical scheme is adopted, and the utility model has remarkable technical effects:

[0014] The trapezoidal fold line on the die guides the flanging path, ensuring that each sheet material is folded according to a unified standard, and the forming error is small.

[0015] After the flanging is completed, the overlapping area is naturally formed, the welding head can act on the area accurately, and the virtual welding and partial welding phenomenon is eliminated. Through double-side synchronous processing or transfer processing or rotary switching processing, combined with automatic feeding and output, the production efficiency is greatly improved, and automatic production is realized. DRAWINGS

[0016] Figure 1 is a structural schematic view of the utility model;

[0017] Figure 2 is a schematic view of the internal structure of the flanging and welding device body.

[0018] Figure 3 This is a schematic diagram of the bag body formed from sheet material;

[0019] The parts referred to by the numbers in the above attached figures are as follows: 5. Flanging and welding device body; 51. Working platform; 52. Press mold; 521. Trapezoidal fold line; 53. Front flanging part; 54. Side flanging part; 55. Welding head; 7. Sheet material transfer device; 81. Output conveyor belt; 9. Body; 91. Bottom surface; 92. Front flanging part; 93. Side flanging part. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] The flanging and welding device of the flexible bag forming machine, such as Figures 1-2 As shown, the device includes a flange welding device body 5. The sheet material to be formed is pre-processed by removing waste from the four corners, making the sheet material cross-shaped. The flange welding device body 5 includes a flange assembly, which includes a working platform 51 for laying out a single sheet material. Above the working platform 51, there is a sheet-shaped pressing mold 52 and a welding head 55 for welding the overlapping parts of the two sides of the sheet material folded into a trapezoidal shape. One outer edge of the pressing mold 52 forms a trapezoidal fold line 521, the shape of which matches the edge shape of the bottom surface of the sheet material after forming. The working platform 51 and the pressing mold 52 can move horizontally relative to each other, allowing the pressing mold 52 to detach from the bag body on the side where welding is completed. The cavity, welding head 55, and pressing mold 52 are respectively connected to a power source that drives them to rise and fall. 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 two oblique edges of the pressing mold 52 of the bag body through straight or arc movement, folding the corresponding side of the pressing mold of the sheet material into a trapezoid. The sheet material folded by the front flange 53 and the sheet material folded by the side flanges 54 on both sides have an overlapping part.

[0023] In one embodiment, 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.

[0024] It also includes a sheet material transfer device 7, which moves the sheet material to the flange welding device body 5 by means of suction and / or clamping.

[0025] It also includes an output conveyor belt 81, which is located downstream of the flanging welding device body 5. There is a bag pulling mechanism that can move horizontally and reciprocally between the output conveyor belt 81 and the flanging welding device body 5.

[0026] Working principle:

[0027] The single sheet material is moved from the sheet cutting device 3 to the edge welding device body 5 by the sheet transfer device 7 through suction or / and clamping. The clamping can clamp the side edge or front edge of the sheet material, and the suction can act on the upper surface of the bag body sheet material. The sheet transfer device 7 at least has longitudinal movement, and can also have lifting movement. The side edges of the working platform are provided with positive edge turning members 53, and the left and right sides of the positive edge turning members 53 are provided with side edge turning members 54. The die 52 and the welding head 55 each have two groups, which are located at both ends of the platform. The positions of the positive edge turning members 53 and the side edge turning members 54 on the working platform 51 are not limited, as long as the front and rear groups of positive edge turning members 53 and side edge turning members 54 act on the opposite sides of the bag body, such as the front and rear sides or the left and right sides. The positive edge turning members are longitudinally advanced, the die 52 is pressed down to the side of the sheet material that needs to be edge welded, the first group of positive edge turning members 53 and side edge turning members 54 act first to fold the edge of the sheet material inward along the outer periphery of the die 52. The positive edge turning members 53 can act before or after the side edge turning members 54. The positive edge turning members 53 and the side edge turning members 54 can fold the bag in a hinged swinging manner or in a manner of first lifting, then inward, and then downward. When folding the bag, the edge along the outer side of the die 52 and the two waist lines are folded up as fold lines 521. Then, the bag is kept in the folded state, the welding head 55 is pressed down to weld the positions corresponding to the two high lines of the trapezoid, so that the side of the bag body is fixed, and then the die 52 is transversely moved out of the bag body and rises upward. The bag body is conveyed to the next station, and the second group of dies 52, positive edge turning members 53, side edge turning members 54, and welding heads 55 act similarly to weld the other side of the bag body, so that the bag body forms a hexagonal or octagonal shape. When the bag body is unfolded, it has a side wall around the circumference, a square bottom surface, and an upward opening.

[0028] After welding, the bag pulling mechanism horizontally extends 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.

[0029] Example 2

[0030] The same as example 1, the difference is that the die 52 above the working platform 51 is a group, and the die 52 and the working platform 51 can rotate relative to each other. The die 52 and the working platform 51 have a first state and a second state after relative rotation. In the first state, the 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 working platform 51. In the second state, the die 52 corresponds to the other side of the two sides of the sheet material on the working platform 51.

[0031] If the mold 52 is rotatable, 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 is rotatable, 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.

[0032] The difference in working principle is that after the folding and welding of the bag is completed on the first side, the folding and welding of the other side of the bag is done on the same workpiece.

[0033] 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°.

[0034] 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°.

[0035] 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.

[0036] Example 3

[0037] like Figure 3 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.

[0038] In the description of the utility model, need understanding is, the orientation or position relation that the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" indicate is based on the orientation or position relation shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicating or implying that the indicated device or element must have a particular orientation, is constructed and operated in a particular orientation, therefore can not be understood as a restriction on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise expressly specifically limited.

[0039] In summary, the above only for the preferred embodiment of the utility model, all changes and modifications made in the utility model patent application scope, should belong to the utility model patent's coverage range.

Claims

1. A device for flange welding of a flexible bag body forming machine, characterized in that The device comprises a flanging and welding device body (5), the flanging and welding device body (5) comprises a flanging assembly, the flanging assembly comprises a workbench (51) for laying a single sheet, a sheet-shaped die (52) is arranged above the workbench (51), and a welding head (55) is arranged for welding the overlapped parts of the two sides of the sheet folded into a trapezoidal shape; the outer edge of one side of the die (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 after forming; the workbench (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 welding finished, the welding head (55) and the die (52) are respectively connected with a power source for driving them to ascend and descend, the side of the workbench (51) is provided with a normal flanging member (53), the two sides of the normal flanging member (53) are respectively provided with side flanging members (54), the side flanging members (54) and the normal flanging member (53) respectively fold the sheet inward along the edges of the upper bottom and the two inclined sides of the bag die (52) through linear or arc movement to fold the sheet on one side corresponding to the die into a trapezoidal shape, wherein the sheet folded by the normal flanging member (53) has an overlapped part with the sheets folded by the two side flanging members (54).

2. The device according to claim 1, wherein: The die (52) and the welding head (55) above the workbench (51) have at least two groups, one group corresponding to one side of the two longitudinal sides of the sheet, and the other group corresponding to the other side of the longitudinal front and back of the sheet.

3. The device according to claim 1, wherein: The die (52) above the workbench (51) is a group, the die (52) and the workbench (51) can rotate relative to each other, the die (52) and the workbench (51) have a first state and a second state after relative rotation, in the first state, the die (52) corresponds to one side of the two longitudinal sides or one side of the two transverse sides of the sheet on the workbench (51), in the second state, the die (52) corresponds to the other side of the two sides of the sheet on the workbench (51).

4. The device according to claim 3, wherein: The die (52) is rotatable, and the two sides of the workbench (51) are provided with normal flanging members (53), side flanging members (54) and welding heads (55).

5. The device of claim 3, wherein: The workbench is rotatable, and the two sides of the workbench (51) are provided with normal flanging members (53) and side flanging members (54), the normal flanging members (53) and the side flanging members (54) are connected with the workbench (51) and rotate together.

6. The device of claim 1 wherein: The device further comprises a sheet transfer device (7), which moves the sheet to the flanging and welding device body (5) by suction or / and clamping.

7. The device of claim 1 wherein: The device further comprises an output conveyor belt (81), which is located downstream of the flanging and welding device body (5), and there is a horizontal reciprocating bag pulling mechanism between the output conveyor belt (81) and the flanging and welding device body (5).

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