Middle-sealed bag body upper opening folding staggered opening wrapping device and forming process thereof

Abstract

The invention relates to the field of paper bag making machines, and discloses a middle-sealed bag body upper opening folding staggered opening packaging device and a forming process thereof. The device comprises an opening folding device and an opening wrapping device, the opening folding device automatically folds an opening through cooperative work of a local opening folding part and a covering and infolding part to form an insertion opening, and the opening wrapping device achieves insertion of an inner insertion side piece into the insertion opening and demolding of a bag body through an inner insertion bag removing belt and a fixed bag removing belt. The forming process comprises the steps of sheet material fixing, opening folding, mold downward pressing, side sheet folding, inner inserting side sheet inserting, middle sealing pressure applying, demolding and the like. Manual operation is avoided, the production efficiency is improved, the folding quality consistency is guaranteed, the bag body damage rate is reduced, the equipment cost is saved, and different opening packaging processes are achieved.

Description

Technical Field

[0001] The invention relates to the field of paper bag making machines, in particular to a device for staggered opening of a middle-sealed bag body and a forming process thereof. Background Art

[0002] Center-sealed paper bags require gluing the sides of the bag into a U-shape. For bags with openings on both the fixed and movable sides, direct gluing is not possible. Instead, the inner side panels on each side must be inserted into the outer side panels and then gluing them together. In existing technologies, forming the openings of center-sealed bags typically requires manual labor, which is not only inefficient but also expensive. In addition, there is also a method of gluing the side edges before closing the mouth, such as invention patent CN119116452B, which discloses a paper bag closing machine and its bag opening closing process flow. The process is to first mark the bag opening with a triangular auxiliary inner fold line and a bag opening inner fold line, complete the center seal on both sides, and then put the paper bag into the closing machine; turn the front and back of the bag opening outward, spray a long strip of glue on the front and back of the bag opening after being turned outward, and then open the bag opening with a bag opening device at the bag opening inner folding device, and then turn the two sides of the bag opening outward, then turn the front and back of the bag opening inward with a pressing plate, then turn the two sides of the bag opening inward to the top of the front and back of the bag opening, and then turn the front and back and both sides of the bag opening downward with an insert plate, and finally close the bag opening device. However, this method is relatively complicated to operate and requires the additional installation of a folding machine with complex movements, which occupies a large space, has high equipment costs, and low work efficiency. Another method is to fold the upper edge first and then overlap and glue the side edges. The upper edge needs to be plugged in, which is more complicated to operate. According to the folding device in the prior art, the folding piece of the bag body will be completely closed with the fixed surface or the movable surface of the bag body, which is not conducive to the subsequent use of the machine to perform the plugging and overlapping work, and it is difficult to adapt to bags of different sizes and ensure the quality and consistency of the folding.

[0003] In addition, in the prior art, when the mold is pressed down, the fixed bag-removing belt does not work on the surface of the bag body, or is used to brake the bag body when the mold is pressed down. The bag body with a center seal needs to use other rigid pushing blocks to push the inner side piece on one side diagonally downward and then return it to its position to realize the insertion. The insertion structure of the inner side piece is complicated by this structure, and because the rigid pushing block is in direct contact with the top surface of the inner side, it is very easy to damage the bag. Moreover, after the bag body of the prior art is formed, the plane of the bag body is parallel to the mold, and the four side edges of the bag body are against the four side edges of the mold. The side of the mold must be provided with a corresponding device and a groove for the side of the bag body to poke inward. When removing the bag, it is necessary to use an inner poking tool to poke the side of the bag body inward to deform the bag body before it can be separated from the top to the bottom. In order to solve the problems of high cost and low efficiency caused by the complex structure and operation of the paper bag insertion in the existing technology, as well as the problem that the bag body is easily damaged during the insertion and demoulding process, a device for folding the upper opening of a middle-sealed bag body with staggered sealing is needed, which can automatically and efficiently complete the partial folding of the middle-sealed bag body and insert the bag in a way that reduces damage to the bag body and is more efficient. Summary of the Invention

[0004] Aiming at the shortcomings of the prior art, the present invention provides a device for staggering the folded upper opening of a middle-sealed bag body and a forming process thereof.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions: A device for wrapping a middle-sealed bag body with a staggered upper folding mouth comprises a folding device and a wrapping device. The wrapping device and the folding device are connected in conveyance, and the bag body first passes through the folding device and then enters the wrapping device for forming.

[0006] The folding device includes a folding work platform, a partial folding component, and a covering inner folding component. The folding work platform is used to support the bag body sheet; the partial folding component is arranged on one side of the folding work platform. The partial folding component can fold the folding piece of the bag body sheet inward along the bag body fold line through linear or arc motion. The edges of the partial folding component on both sides of the x-axis direction are respectively located inward of the two side edges of the bag body sheet. The total length of the partial folding component is narrower than the length of the folding piece, and both sides of the folding piece are exposed outside the partial folding component, so that the outer side piece of the bag body sheet pre-glued along the x-axis direction and the folding piece at the top folded inward form a non-contact insertion on both sides of the x-axis direction.

[0007] The local folding component and the covering inner folding component are respectively located on both sides of the bag sheet in the y-axis direction. The covering inner folding component is set on the other side of the folding working platform. It can fold the folding piece of the bag sheet inward along the bag fold line through linear or arc motion, and the covering inner folding component folds the folding piece of the bag sheet on the side of the inner inserting side piece inward. Through the coordinated work of the local folding component and the covering inner folding component, the folding operation of the bag sheet can be automatically completed, and the folding piece of the local folding component is respectively formed between the two sides of the folding piece and the outer side pieces on both sides. The folding piece on the side of the covering inner folding component is completely flattened to facilitate subsequent insertion into the socket. This structure avoids manual operation, improves production efficiency, and ensures the consistency of folding quality.

[0008] The bagging device includes a mold, an outer side insert, an inner side insert, a fixed bagging belt and an inner bagging belt. The mold can be lifted and lowered to press the bag sheet downward to form a U shape; the outer side insert drives the outer side sheet of the bag body to fold inward through movement in the y-axis direction or arc movement; the inner side insert drives the inner side sheet with overlapping sides to fold inward through movement in the y-axis direction or arc movement; the fixed bagging belt is in contact with the fixed surface, and the opposite side of the fixed surface of the bag body is the moving surface. The outer side sheet is connected to both sides of the fixed surface in the x-axis direction, and the inner side sheet is connected to both sides of the moving surface in the x-axis direction; the folding tongue insert folds the folding tongue sheet of the bag body upward by touching; The inner insertion and bag stripping belt is in contact with the moving surface. When the inner insertion and bag stripping belt rotates, the moving surface of the bag body is driven to move by friction, thereby causing the inner insertion side pieces connected on both sides of the moving surface to move up and down. The inner insertion and bag stripping belt has a first stroke of forward rotation, so that the height of the top edge of the inner insertion side piece is lower than the bottom edge of the folding piece at the top of the outer side piece; when the inner insertion and bag stripping belt is in the first stroke or the second stroke, the inner surface of the outer side inserting plate is in contact with the folding piece and maintains a state of having a socket between the outer side piece and the folding piece; sufficient space is provided for the inner insertion side piece to be inserted into the socket, ensuring a smooth insertion process.

[0009] After the first stroke, the inner insertion and stripping belt has a second upward stroke, driving the moving surface of the bag body to move, allowing the inner inserting side panel to be inserted from bottom to top into the slot formed between the outer side panel and the folding flap. The flexible belt drive replaces the rigid push block, significantly reducing the damage rate. Furthermore, the action can be completed using the necessary structure for demoulding. Only slight differences in the position of the outer and inner side inserts and an additional stroke of the belt are required to complete the action. This significantly reduces the cost of installing an additional slotting device, improves slotting efficiency, and reduces the risk of bag damage.

[0010] Preferably, the two side edges of the covering inner folding member in the x-axis direction are flush with the two side edges of the bag body sheet or exceed the edges of the bag body sheet, so as to better fold the inner side sheet and make the fold more flat and firm.

[0011] Preferably, the local folding part and the covering inner folding part are respectively arranged on the mounting seat, and the mounting seat is transmission-connected to the inner folding power source.

[0012] Preferably, the mounting seat of the partial folding part is an inward folding slide rail extending along the x-axis direction, and the partial folding part is slidably adjustable on the inward folding slide rail. The partial folding part extends out from the inner side of the inward folding slide rail, and the inward folding slide rail is transmission-connected with an inward folding power source, which is convenient for adjustment according to bag sheets of different sizes, thereby enhancing the versatility of the device.

[0013] Preferably, the inward folding power source includes an inward folding lifting drive device and an inward folding horizontal drive device. The inward folding lifting drive device is arranged on the inward folding power source mounting frame, and the inward folding horizontal drive device is transmission-connected to the inward folding power source mounting frame.

[0014] Preferably, the partial folding member is composed of at least two combined sliders, each of which can move independently on the inner folding slide rail. The sliders can move independently, which can more flexibly adapt to bag sheets of different shapes and sizes and improve the accuracy of the folding.

[0015] Preferably, the sliders have different widths along the x-axis. The wider slider corresponds to the front or back of the bag sheet, while the narrower slider corresponds to the position of the outer side sheet. The narrower slider is located inward of the x-axis edge of the outer side sheet. The narrower slider can adjust the required distance between the two sides and the bag edge according to the size of the bag and the size of the socket. The sliders can be adjusted by sliding along the x-axis at any time, and can be removed, added, or replaced. Various designs are all convenient for adjustment.

[0016] Preferably, a gluing device that can reciprocate along the y-axis is provided above the working platform, which can evenly glue the bag sheet to ensure subsequent bonding.

[0017] Preferably, a sheet material fixing device is further provided above the working platform, and the sheet material fixing device fixes the bag sheet material above the folding working platform by pressing down or by adsorption.

[0018] Preferably, a sheet material fixing device is provided above the working platform. The sheet material fixing device fixes the bag sheet material on the folding working platform by pressing downward. The sheet material fixing device is connected to the inner folding power source mounting frame and moves inward and outward along the y-axis synchronously with the inner folding power source mounting frame. This prevents the bag sheet material from moving during the folding process, thereby ensuring the accuracy and stability of the folding.

[0019] Preferably, before the inner side panel is inserted into the insertion opening, the outer side panel and the inner side panel are kept outside the outer side panel and the inner side panel. This arrangement prevents the outer side panel and the inner side panel from bouncing outward, avoids obstruction caused by the inner side panel during downward and upward insertion, and avoids collision between the inner side panel of the bag body and the inner side panel or the folding panel, thus ensuring smooth insertion.

[0020] Preferably, the contact area between the outer side insert and the outer side sheet is smaller than the area of the outer side sheet. The outer side insert and the outer side sheet are not completely covered, providing space for the folded piece outside the outer side sheet to bend outward, so that the insertion opening is large enough to insert the inner side sheet on the other side.

[0021] Preferably, the inner side insert plate is in contact with the inner side sheet while the overlapped edge is not in contact with the mold, so as to avoid excessive pressure of the inner side sheet against the mold, which may cause the inner side sheet to collide with the outer side sheet during downward or upward movement.

[0022] Preferably, the friction between the moving surface and the inner insertion and stripping belt is greater than the friction between the inner surface of the moving surface and the mold, ensuring that the inner insertion and stripping belt can effectively drive the moving surface and the inner insertion side piece to move downward or insert the inner insertion side piece into the socket.

[0023] Preferably, the friction between the fixed surface and the fixed bag stripping belt is greater than the friction between the inner surface of the fixed surface and the mold, ensuring that the fixed bag stripping belt can drive the fixed surface to move, thereby driving the inner side panel to move, while achieving pre-deformation of the bag body to facilitate subsequent demolding.

[0024] Preferably, a plywood is provided on the side of the mold, which can move closer to or away from the mold along the y-axis, thereby facilitating adhesion of the seal in the bag and improving the molding quality of the bag.

[0025] Preferably, the plywood, after applying pressure to the middle seal of the paper bag near the mold, retreats away from the mold. The internally inserted stripping belt then rotates in a forward third stroke, synchronously rotating with the fixed stripping belt to pull the bonded bag downward and out of the mold. This design utilizes the same set of components to pull the bonded bag downward and out of the mold. This design enables automatic demolding of the bag, eliminating the need for additional poke tools, simplifying the demolding process and improving production efficiency.

[0026] The forming process of the middle-sealed bag body with the staggered folded upper mouth is formed by a device for staggered folded upper mouth of the middle-sealed bag body. Bag body. It includes the following steps: A. The sheet fixing device places the bag sheet on the folding working platform by pressing down or adsorbing; B. The local folding component folds the folding piece of the bag body sheet inward along the bag body fold line through a linear or arc motion, so that the outer side sheet forms a non-contact insertion on both sides of the x-axis direction, and the covering inner folding component folds the folding piece of the bag body sheet on this side inward; C. The sheet fixing device is released, and the bag conveying device transfers the bag sheet 90 to the bottom of the mold of the bag opening device. The mold descends, pressing the bag sheet downward to initially form the bag into a U shape. D. Relative movement occurs between the folding tongue plate and the folding tongue piece, causing the folding tongue piece to fold upward; E. The inner side insert and the outer side insert respectively move in the y-axis direction, driving the outer side panel and the inner side panel to fold inward. Before the outer side insert and the inner side insert are completed folded, the folding tongue insert moves downward and retreats; F. The inner insertion and bag removal belt rotates forward in the first stroke, so that the height of the top edge of the inner side piece is lower than the bottom edge of the folding piece at the top of the outer side piece; then the inner insertion and bag removal belt moves upward in the second stroke, driving the moving surface of the bag body to move so that the inner side piece is inserted from bottom to top into the socket formed between the outer side piece and the folding piece; Preferably, the following steps are also included: G, the plywood moves along the y-axis direction to approach the mold, applying pressure to the middle seal of the paper bag to make the middle seal bonded; H, the plywood retreats away from the mold, the inserted bag stripping belt has a third stroke of forward rotation, and the fixed bag stripping belt rotates synchronously to drive the bonded bag body downward to separate from the mold.

[0027] Preferably, in step E, the fixed bag stripping belt rotates synchronously to drive the fixed surface to move, thereby achieving pre-deformation of the bag body.

[0028] Preferably, in step F, when the inner side panel is inserted into the socket from bottom to top, there is a gap of no more than 1 mm between the top of the inner side panel and the fold line at the top of the socket.

[0029] Preferably, in step H, the inner stripping belt is retracted from the bag opening position to the bag stripping position before the third stroke to avoid excessive friction during bag stripping to damage the bag body.

[0030] The linear or arc movement of the partial folding parts and the covering inner folding parts. The linear movement includes a folding line movement composed of a straight line or multiple straight lines. The arc movement refers to the way the partial folding parts and the covering inner folding parts flip the folding piece inward like a hinge. The purpose is to complete the folding action of the folding piece.

[0031] The present invention has significant technical effects due to the adoption of the above technical solutions: The present invention eliminates the need for punching the bag during demolding. After the bag is formed, the bag and the mold have almost identical shapes, so the bag needs to be punched inward to deform it. The fixed stripping belt is then used to pull the formed bag out of the mold from top to bottom. However, the present invention eliminates the need for punching the bag during demolding because the fixed stripping belt has already driven the fixed surface to move during the insertion of the inner side panel into the slot, pre-deforming the bag and pre-adjusting its posture. Therefore, the bag is not completely parallel to the mold. Therefore, demolding can be easily completed during the subsequent demolding process even without the need for additional punching.

[0032] Through the coordinated work of the local folding component and the covering inner folding component, the folding operation of the bag sheet can be automatically completed, and the folding pieces of the local folding component are respectively formed between the outer side pieces on both sides, and the folding piece on one side of the covering inner folding component is completely flattened to facilitate subsequent insertion into the insertion. This structure avoids manual operation, improves production efficiency, and ensures the consistency of folding quality. The overall width of the local folding component can be moved by sliding, and can also be adjusted by adding, replacing, and reducing sliders to adapt to bag folds of different specifications.

[0033] Since the fixed surface is in contact with the fixed bag-taking belt, the fixed bag-taking belt does not directly contact the inner side piece, so it can drive the inner side piece, and the vertical movement of the fixed bag-taking belt can be converted into a slightly tilted movement of the inner side piece. Moreover, since there is a flexible contact between the fixed bag-taking belt and the fixed surface of the bag body, the inner side piece is also driven to move due to the existence of friction when it moves, and generally there will be no collision with the outer side piece before it is inserted into the socket. Even if there is a collision, the belt friction transmission is used instead of the mechanical push block, and the flexible contact will not generate a force that damages or even destroys the bag body.

[0034] By cooperating with the folding device and the wrapping device, an insertion opening of the inner side piece of the bag body material is formed during the folding process, which is pre-glued but kept non-contact. After the wrapping device completes the wrapping, the inner and outer surfaces of the inner side piece are brought into contact and adhered to the folding tongue piece and fixed surface of the outer wrapping side piece through the plywood, thereby realizing different wrapping processes.

[0035] By utilizing the components that originally worked only in the bagging step, during the bagging process, the fixed bagging belt and the inner bagging belt are made to move relative to each other in asynchronous manner, resulting in relative movement between the inner side panel and the outer side panel, thereby realizing the bagging. This not only saves equipment costs but also achieves a better bagging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a side view of the present invention; Figure 2 is a top view of the present invention; Figure 3It is a structural schematic diagram of the local folding component of the present invention; Figure 4 yes Figure 3 A partial enlarged view of middle D; Figure 5 This is a structural diagram of the local folding component from another angle; Figure 6 A schematic structural diagram of the covered inward folding component of the present invention; Figure 7 This is a structural schematic diagram of the offset bag opening bonding device on one side of the present invention before the outer bag side insert plate and the inner bag side insert plate are folded; Figure 8 yes Figure 7 A partial enlarged view of middle A; Figure 9 yes Figure 7 Structural diagram from another angle; Figure 10 yes Figure 9 A partial enlarged view of B in the middle; Figure 11 It is a structural schematic diagram of the present invention after the inner insertion and bag stripping belt on one side completes the first stroke during the upper and lower misaligned bagging process; Figure 12 yes Figure 11 Structural diagram from another angle; Figure 13 yes Figure 12 A partial enlarged view of center C; Figure 14 This is a schematic structural diagram of one side of the present invention after the bag opening is completed but before the bag is removed; Figure 15 It is a structural schematic diagram of the local folding part, the covering inner folding part and the bag body sheet of the present invention.

[0037] The names of the parts indicated by the numerical labels in the above drawings are as follows: 5, folding device; 51, folding working platform; 52, local folding component; 521, inner folding slide rail; 53, covering inner folding component; 54, inner folding lifting drive device; 55, inner folding horizontal drive device; 56, slider; 57, inner folding power source mounting frame; 58, sheet material fixing device; 59, gluing device; 6, wrapping device; 61, mold; 62, outer side plug-in plate; 63, inner side plug-in plate; 64, fixed bagging belt; 65, inner bagging belt; 66, plywood; 67, folding tongue plug-in plate; 90, bag body sheet; 91, outer side sheet; 92, inner side sheet; 93, fixed surface; 94, moving surface; 95, socket; 96, folding sheet; 97, folding tongue sheet. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1 A device for sealing a middle-sealed bag body with a staggered upper opening, such as Figure 1-2 As shown, the system includes a folding device and a mouth-wrapping device that are sequentially conveyed and connected. The bag first passes through the folding device before entering the mouth-wrapping device for forming. The center-sealed bag partial folding device includes a folding work platform 51, a partial folding component 52, and a covering inner folding component 53. The main bag sheet is the sheet on the front and back of the bag. The outer surface of the bag sheet on one side is the fixed surface 93, and the outer surface of the bag sheet on the other side is 94.

[0040] like Figure 3-4 As shown, the folding working platform 51 is used to support the bag sheet 90; the local folding component 52 is arranged on one side of the folding working platform 51, and the local folding component 52 can fold the folding piece 96 of the bag sheet 90 inward along the bag fold line through a straight line or arc movement, and the edges on both sides of the local folding component 52 in the x-axis direction are respectively located on the inner side of the two side edges of the bag sheet 90, and the total length of the local folding component 52 is narrower than the length of the folding piece 96 and both sides of the folding piece 96 are exposed from the local folding component 52, so that the outer side piece 91 of the bag sheet 90 pre-glued along the x-axis direction and the folding piece 96 folded inward at its top form a non-contact socket 95 on both sides of the x-axis direction.

[0041] like Figure 2 As shown, the local folding part 52 and the covering inner folding part 53 are respectively located on both sides of the bag sheet 90 in the y-axis direction, and the covering inner folding part 53 is arranged on the other side of the folding working platform 51. The folding piece 96 of the bag sheet 90 can be folded inward along the bag fold line through a straight line or arc movement, and the covering inner folding part 53 folds the folding piece 96 of the bag sheet 90 on the side of the inner inserted side piece inward.

[0042] like Figure 4-5 As shown, both side edges of the covering inner folding part 53 in the x-axis direction are flush with both side edges of the bag body sheet 90 or exceed the edges of the bag body sheet 90 .

[0043] The local folding part 52 and the covering inner folding part 53 are respectively arranged on the mounting base, and the mounting base is transmission-connected to the inner folding power source.

[0044] like Figure 5 As shown, the mounting seat of the partial folding part 52 is an inward folding slide rail 521 extending along the x-axis direction, and the partial folding part 52 is slidably adjustable on the inward folding slide rail 521. The partial folding part 52 extends out from the inner side of the inward folding slide rail 521, and the inward folding slide rail 521 is transmission-connected to an inward folding power source.

[0045] The inner folding power source can be a rotating power source that drives the folding leaf to swing, such as a transmission structure commonly used in the art of motor and electric cylinder linkage, or it can be at least two driving devices that drive the inner folding action. As one of the practicable methods, the inner folding power source includes an inner folding lifting drive device 54 and an inner folding horizontal drive device 55. The inner folding lifting drive device 54 is arranged on the inner folding power source mounting frame 57, and the inner folding horizontal drive device 55 is transmission-connected to the inner folding power source mounting frame 57. After the inner folding lifting drive device 54 lifts the folding piece part, the inner folding horizontal drive device 55 drives the inner folding horizontal drive device 55 to fold inward, and then the inner folding lifting drive device 54 drives the folding piece downward. The inner folding lifting drive device 54 and the inner folding horizontal drive device 55 are common driving devices in the art such as motors and cylinders.

[0046] The partial folding part 52 is composed of at least two combined sliding blocks 56 . The lengths of the sliding blocks 56 in the y-axis direction are equal or unequal, and each sliding block 56 can move on the inner folding slide rail 521 respectively.

[0047] The width of the slider 56 in the x-axis direction is different. The wider slider 56 corresponds to the front or back of the pressed bag sheet 90, and the narrower slider 56 corresponds to the position of pressing the outer side sheet 91. The narrower slider 56 is located on the inner side of the edge of the outer side sheet 91 in the x-axis direction.

[0048] A glue applying device 59 is provided above the working platform 51 and can move back and forth along the y-axis direction.

[0049] A sheet material fixing device 58 is further provided above the working platform 51 , and the sheet material fixing device 58 fixes the bag sheet material 90 above the folding working platform 51 by pressing down or by adsorption.

[0050] A sheet material fixing device 58 is also provided above the working platform 51. The sheet material fixing device 58 fixes the bag sheet 90 on the folding working platform 51 by pressing down. The sheet material fixing device 58 is connected to the inner folding power source mounting frame 57 and moves inward and outward along the y-axis direction synchronously with the inner folding power source mounting frame 57.

[0051] The bag body sheet 90 is placed on the folding work platform 51 , and the sheet fixing device 58 fixes the bag body sheet 90 above the folding work platform 51 by pressing down or adsorbing.

[0052] Gluing operation: The gluing device 59 moves back and forth along the y-axis direction to glue the edge parts of the bag body sheet 90 that need to be bonded. The gluing in the x-axis direction is completed before the folding. Both sides of the sheet in the y-axis direction need to be pre-glued in the x-axis direction before the folding. The gluing in the y-axis direction can be selected. One way is to glue the edge in the y-axis direction on the side where the socket is formed before the folding. It can also be to glue both sides of the flattened side of the sheet in the y-axis direction before or after the folding, so that the overlapping edge can be fixed to the inner wall of the socket after insertion. Among them, the part corresponding to the socket is glued but not flattened in the subsequent folding process. If necessary, you can also choose to move along the y-axis direction and glue the overlapping edge.

[0053] The local folding member 52 is driven by a power source connected to the inward folding, and the covering inward folding member 53 is driven by a power source connected to the inward folding. The local folding member 52 folds the folding piece 96 of the bag body sheet 90 inward along the bag body fold line through linear or arc motion, so that the outer side sheet 91 and the top inward folding piece 96 form a non-contact insertion opening 95 on both sides of the x-axis direction. The covering inward folding member 53 folds the folding piece 96 of the bag body sheet 90 on this side inward.

[0054] like Figure 15 As shown, after each change of the bag body specifications, the position of the local folding part 52 can be adjusted through the inner folding slide rail 521 according to the size of the bag body sheet 90, and a more precise folding operation can be achieved by moving the combination slider 56 or adjusting the number and size of the combination slider 56.

[0055] After the above operations, the bag body sheet 90 is folded and the insertion opening 95 is formed, the sheet fixing device 58 is released, and the folded bag body is taken out.

[0056] like Figure 6-8As shown, it includes a mold 61, an outer side insert plate 62, an inner side insert plate 63, a fixed bag-removing belt 64 and an inner bag-removing belt 65. The mold 61 can move up and down to press the bag sheet 90 downward to form a U shape; the outer side insert plate 62 drives the outer side piece 91 of the bag to fold inward through movement in the y-axis direction or arc movement; the inner side insert plate 63 drives the inner side piece 92 with a lap edge 921 on the side to fold inward through movement in the y-axis direction or arc movement; the folding tongue insert plate 67 causes the folding tongue piece 97 of the bag to fold upward by touching; the touching can be that the mold 61 presses down to drive the folding tongue piece to hit the folding tongue insert plate 67 to cause the folding tongue piece 97 of the bag to fold upward, or the folding tongue insert plate 67 is inserted to cause the folding tongue piece 97 of the bag to fold upward. The fixed bag-removing belt 64 contacts the fixed surface 93, and the opposite side of the fixed surface 93 of the bag body is the movable surface 94. The fixed surface 93 has outer side panels 91 on both sides in the x-axis direction, and the movable surface 94 has inner side panels 92 on both sides in the x-axis direction; among them, the movement in the y-axis direction is that the inner side insert plate 63 or the outer side insert plate 62 moves horizontally in a direction parallel to its surface so that the side panels of the paper bag are folded inward, and the arc movement is that the inner side insert plate 63 or the outer side insert plate 62 makes the side panels of the paper bag close and fold inward in a hinge-like manner.

[0057] like Figure 9-10 As shown, the inner insertion and stripping belt 65 contacts the moving surface 94, and when the inner insertion and stripping belt 65 rotates, the moving surface 94 of the bag body is driven by friction to move, so that the inner side pieces 92 connected on both sides of the moving surface 94 move up and down, and the inner insertion and stripping belt 65 has a first stroke of forward rotation, so that the height of the top edge of the inner side piece 92 is lower than the bottom edge of the folding piece 96 at the top of the outer side piece 91; when the inner insertion and stripping belt is in the first stroke or the second stroke, the outer side inserter 62 remains outside the outer side piece 91, and the inner surface of the outer side inserter 62 contacts the folding piece 96 and maintains the state of having a socket 95 between the outer side piece 91 and the folding piece 96; the inner insertion and stripping belt 65 has a second stroke of upward movement after the end of the first stroke, driving the moving surface 94 of the bag body to move, so that the inner side piece 92 is inserted from bottom to top into the socket 95 formed between the outer side piece 91 and the folding piece 96.

[0058] like Figure 11-13 As shown, before the inner side sheet 92 is inserted into the insertion opening 95 , the outer side insert 62 and the inner side insert 63 are kept outside the outer side sheet 91 and the inner side sheet 92 .

[0059] The friction between the moving surface 94 and the inner stripping belt 65 is greater than the friction between the inner surface of the moving surface 94 and the mold 61. The friction between the fixed surface 93 and the fixed stripping belt 64 is greater than the friction between the inner surface of the fixed surface 93 and the mold 61.

[0060] like Figure 14As shown, a plywood 66 is provided on the side of the mold 61. The plywood 66 can move along the y-axis toward or away from the mold 61. After the plywood 66 approaches the mold 61 and applies pressure to the seal of the paper bag, it retreats away from the mold 61. The inserted bag stripping belt 65 then rotates in the third stroke in the forward direction. The fixed bag stripping belt 64 rotates synchronously, driving the bonded bag body downward and away from the mold 61.

[0061] As one embodiment, the contact surface area between the outer side insert 62 and the outer side sheet 91 is smaller than the area of the outer side sheet 91. When the inner side insert 63 contacts the inner side sheet 92, the overlap 921 is kept away from the mold 61.

[0062] The distance between the outer side insert 62 and the outer side piece 91, as well as the contact area between the outer side pieces 91, partially determine the size of the socket opening. Therefore, it is necessary to properly adjust the forward and backward and left and right travel of the outer side insert 62, in conjunction with the insertion position of the inner side insert 63 and the distance between the inner side insert 63 and the mold, so that the inner side piece 92 can smoothly move down and then rise, allowing it to be smoothly inserted into the socket.

[0063] Specific working steps: 1. Bag sheet placement: Place the bag sheet 90 below the mold 61 . The bag sheet 90 includes an outer side sheet 91 , an inner side sheet 92 , a fixed surface 93 and a movable surface 94 .

[0064] 2. Mold pressing down: The mold 61 descends, pressing the bag sheet 90 downward to preliminarily shape the bag into a U shape.

[0065] 3. Side panel folding: After the folding tongue insert 67 and the folding tongue piece 97 generate relative movement to fold the folding tongue piece 97 upward, the inner side insert 63 and the outer side insert 62 respectively drive the outer side piece 91 and the inner side piece 92 to fold inward through movement in the y-axis direction or arc movement. Before the outer side insert 62 and the inner side insert 63 complete folding, the folding tongue insert 67 moves downward and retreats.

[0066] 4. Inserting the inner side piece into the socket: The inner inserting and stripping belt 65 first rotates forward in the first stroke, so that the height of the top edge of the inner side piece 92 is lower than the bottom edge of the folding piece 96 at the top of the outer side piece 91; then the inner inserting and stripping belt 65 moves upward in the second stroke, driving the moving surface 94 of the bag body to move so that the inner side piece 92 is inserted from bottom to top into the socket 95 formed between the outer side piece 91 and the folding piece 96. During this process, the fixed stripping belt 64 rotates synchronously, driving the fixed surface 93 to move, thereby achieving pre-deformation of the bag body.

[0067] 5. Pressurizing the middle seal: The plywood 66 moves along the y-axis direction close to the mold 61, applying pressure to the middle seal of the paper bag to make the middle seal bonded.

[0068] 6. Demoulding: The plywood 66 moves away from the mould 61 , the inserted bag stripping belt 65 has a third stroke of forward rotation, and the fixed bag stripping belt 64 rotates synchronously, driving the bonded bag body downward to separate from the mould 61 .

[0069] The mold, outer side insert, inner side insert, folding tongue insert, and joint plate 66 of the present invention can all be cylinders, motors, or cylinders and motors that utilize the coordination of gear racks, screw nuts, and slider guides to achieve motion. The rotation of the inner stripping belt 65 and the fixed stripping belt 64 can be achieved by using a motor to drive a synchronous wheel to rotate, thereby driving the belt mounted on the synchronous wheel to rotate. The driving device is a conventional setting for those skilled in the art. The above is only one of the implementation methods, and other methods are not described here. The linear or arc motion of the local folding part 52 and the covering inner folding part 53, the linear motion includes a folding motion composed of a straight line or multiple straight lines, and the arc motion refers to the way the local folding part 52 and the covering inner folding part 53 flip the folding piece inward like a hinge, all for the purpose of completing the folding action of the folding piece.

[0070] Example 2 The process for forming a center-sealed bag body with a staggered upper folding opening is to form a bag body using the center-sealed bag body staggered upper folding opening forming device of Example 1, comprising the following steps: A. The sheet fixing device 58 places the bag sheet 90 on the folding working platform 51 by pressing down or by adsorption; B. The local folding member 52 folds the folding piece 96 of the bag body sheet 90 inward along the bag body fold line through a linear or arc motion, so that the outer side sheet 91 and the folding piece 96 folded inward at the top thereof form a non-contact insertion opening 95 on both sides in the x-axis direction, and the covering inward folding member 53 folds the folding piece 96 of the bag body sheet 90 on this side inward; C. The sheet fixing device 58 is released, and the bag conveying device transfers the bag sheet 90 to the bottom of the mold 61 of the bag opening device 6. The mold 61 descends, pressing the bag sheet 90 downward to initially form the bag into a U shape. D, the folding tongue plate 67 is first moved upward or pressed down by the mold 61 so that the folding tongue piece 97 collides with the folding tongue plate 67, and the folding tongue piece 97 is folded upward; E, the outer side insert 62 and the inner side insert 63 are respectively driven by the y-axis direction of movement, driving the outer side panel 91 and the inner side panel 92 to fold inward, before the outer side insert 62 and the inner side insert 63 are completed folding, the folding tongue insert 67 moves downward and back away; F. The inner inserting and removing bag belt 65 first rotates forward in the first stroke, so that the top edge of the inner inserting side piece 92 is lower than the bottom edge of the folding piece 96 at the top of the outer side piece 91; then the inner inserting and removing bag belt 65 moves upward in the second stroke, driving the moving surface 94 of the bag body to link the inner inserting side piece 92 from bottom to top and insert it into the insertion hole 95 formed between the outer side piece 91 and the folding piece 96. At this time, the bagging is completed.

[0071] After the bag mouth, if the seal bonding is required, it also has a step G, the plywood 66 moves along the y-axis direction close to the mold 61, the paper bag seal pressure, so that the seal bonding; After the middle seal is bonded, if the bag needs to be removed, there is also step H, the plywood 66 is retreated away from the mold 61, the inserted bag removal belt 65 has a third stroke of forward rotation, and the fixed bag removal belt 64 rotates synchronously, driving the bonded bag body downward to separate from the mold 61.

[0072] In step E, the fixed bag stripping belt 64 rotates synchronously, driving the fixed surface 93 to move, thereby achieving pre-deformation of the bag body.

[0073] In step F, when the inner inserting side piece 92 is inserted into the insertion opening 95 from bottom to top, there is a gap of no more than 1 mm between the top of the inner inserting side piece 92 and the fold line at the top of the insertion opening 95 .

[0074] In step H, before the third stroke, the inner inserting and bag removing belt 65 retreats from the bag opening position to the bag removing position.

[0075] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or location relationships based on the positions or location relationships shown in the accompanying drawings. The x-axis direction is the extension direction of the fold line of the flap of the bag body sheet, and the y-axis direction is the direction of the line connecting the bag openings on both sides of the bag body sheet. The y-axis direction is perpendicular to the x-axis direction, and both the x-axis and y-axis directions are located in the horizontal plane. It should be noted that Figure 3 , Figures 6-14 only show the processing parts on one side in order to show the state of the bag, and the parts on the other side are not drawn, but this does not mean that there are no processing parts on the other side. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0076] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A device for staggering the folded top of a middle-sealed bag, characterized in that: include Folding device (5); Folding device (5) includes - a folding working platform (51) for supporting the bag body sheet (90); - a local folding part (52), which is arranged on one side of the folding working platform (51), and the local folding part (52) can fold the folding piece (96) of the bag body sheet (90) inward along the bag body fold line through a linear or arc motion, the total length of the local folding part (52) is narrower than the length of the folding piece (96) and both sides of the folding piece (96) are exposed from the local folding part (52), so that the outer side piece (91) of the bag body sheet (90) pre-glued along the x-axis direction and the folding piece (96) folded inward at the top thereof form a non-contact insertion opening (95) on both sides of the x-axis direction; - a covering inner folding component (53) is arranged on the other side of the folding working platform (51), and can fold the folding piece (96) of the bag body sheet (90) inward along the bag body fold line through a linear or arc motion, and the covering inner folding component (53) folds the folding piece (96) of the bag body sheet (90) on the side of the inner inserting side piece (92) inward; the local folding component (52) and the covering inner folding component (53) are respectively located on both sides of the bag body sheet (90) in the y-axis direction; The mouth-wrapping device (6) is connected with the mouth-folding device (5) for conveying. The mouth-wrapping device (6) includes - a mold (61) capable of lifting and lowering to press the bag sheet (90) downward to form a U-shape; - a folding tongue insert (67) that folds the folding tongue piece (97) of the bag body upwards by touching it; - an inner side insert (63) that drives the inner side piece (92) with the overlapping edge (921) to fold inwards through movement in the y-axis direction or arc movement; - an outer side insert plate (62) that drives the outer side piece (91) of the bag body to fold inwards through movement in the y-axis direction or in an arc; - a fixed bag-removing belt (64) in contact with the fixed surface (93); - an inner insertion and stripping belt (65), the inner insertion and stripping belt (65) contacts the moving surface (94), and when the inner insertion and stripping belt (65) rotates, the moving surface (94) of the bag body is driven by friction to move, thereby moving the inner insertion side piece (92) up and down, and the inner insertion and stripping belt (65) has a first stroke of forward rotation, so that the height of the top edge of the inner insertion side piece (92) is lower than the bottom edge of the folding piece (96) at the top of the outer side piece (91); the inner insertion and stripping belt (65) is in the first row After the first stroke or the second stroke of the inner insertion and stripping belt (65), the inner surface of the outer side insert plate (62) contacts the folding piece (96) and maintains the state of having the insert (95) between the outer side piece (91) and the folding piece (96).

2. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: Before the inner side piece (92) is inserted into the socket (95), the outer side insert plate (62) and the inner side insert plate (63) are kept outside the outer side piece (91) and the inner side piece (92); the contact surface area between the outer side insert plate (62) and the outer side piece (91) is smaller than the area of the outer side piece (91).

3. The device for staggering the folded upper opening of a middle-sealed bag according to claim 1, characterized in that: When the inner side insert plate (63) contacts the inner side piece (92), the overlap edge (921) is kept out of contact with the mold (61).

4. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: The friction force between the moving surface (94) and the inner insertion bag stripping belt (65) is greater than the friction force between the inner surface of the moving surface (94) and the mold (61); the friction force between the fixed surface (93) and the fixed bag stripping belt (64) is greater than the friction force between the inner surface of the fixed surface (93) and the mold (61).

5. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: A plywood (66) is provided on the side of the mold (61), and the plywood (66) can move along the y-axis direction to approach or move away from the mold (61).

6. The device for staggering the folded top of a middle-sealed bag according to claim 5, characterized in that: The plywood (66) applies pressure to the seal of the paper bag near the mold (61) and then moves away from the mold (61). The inserted bag-removing belt (65) then rotates in the third stroke in the forward direction, and the fixed bag-removing belt (64) rotates synchronously, driving the bonded bag body downward to separate from the mold (61).

7. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: The two side edges of the covering inner folding component (53) in the x-axis direction are flush with the two side edges of the bag body sheet (90) or exceed the edges of the bag body sheet (90).

8. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: The local folding part (52) and the covering inner folding part (53) are respectively arranged on the mounting seat, and the mounting seat is transmission-connected to the inner folding power source.

9. The device for staggering the folded top of a middle-sealed bag according to claim 3, characterized in that: The mounting seat of the partial folding member (52) is an inward folding slide rail (521) extending along the x-axis direction. The partial folding member (52) is slidably adjustable on the inward folding slide rail (521). The partial folding member (52) extends out from the inner side of the inward folding slide rail (521). The inward folding slide rail (521) is transmission-connected to an inward folding power source.

10. The device for staggering the folded top of a middle-sealed bag according to claim 3, characterized in that: The inward folding power source comprises an inward folding lifting drive device (54) and an inward folding horizontal drive device (55). The inward folding lifting drive device (54) is arranged on an inward folding power source mounting frame (57), and the inward folding horizontal drive device (55) is transmission-connected to the inward folding power source mounting frame (57).

11. The device for staggering the folded top of a middle-sealed bag according to claim 4, characterized in that: The local folding part (52) is composed of at least two combined sliding blocks (56), and each sliding block (56) can move on the inner folding slide rail (521).

12. The device for staggering the folded top of a middle-sealed bag according to claim 6, characterized in that: The slider (56) has different widths in the x-axis direction. The wider slider (56) corresponds to the front or back of the pressed bag body sheet (90), and the narrower slider (56) corresponds to the position of pressing the outer side sheet (91). The narrower slider (56) is located on the inner side of the edge of the outer side sheet (91) in the x-axis direction.

13. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: A glue-spraying device (59) that can reciprocate along the y-axis direction is also provided above the working platform (51).

14. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: A sheet material fixing device (58) is also provided above the working platform (51), and the sheet material fixing device (58) fixes the bag sheet material (90) above the folding working platform (51) by pressing down or by adsorption.

15. The device for staggering the folded top of a middle-sealed bag according to claim 1, characterized in that: A sheet material fixing device (58) is also provided above the working platform (51). The sheet material fixing device (58) fixes the bag body sheet material (90) on the folding working platform (51) by pressing downward. The sheet material fixing device (58) is connected to the inner folding power source mounting frame (57) and moves inward and outward along the y-axis direction synchronously with the inner folding power source mounting frame (57).

16. A process for forming a center-sealed bag body with a staggered upper folding opening, characterized in that: The bag body is formed by using the device for folding the upper opening of a middle-sealed bag body and staggering the opening as described in any one of claims 1 to 15, comprising the following steps: A. The sheet material fixing device (58) places the bag body sheet material (90) on the folding working platform (51) by pressing down or by adsorption; B. The local folding member (52) folds the folding piece (96) of the bag body sheet (90) inward along the bag body fold line through a linear or arc motion, so that the outer side sheet (91) and the folding piece (96) folded inward at the top thereof form a non-contact insertion opening (95) on both sides in the x-axis direction, and the covering inward folding member (53) folds the folding piece (96) of the bag body sheet (90) on this side inward; C. The sheet material fixing device (58) is released, and the bag body conveying device transfers the bag body sheet material (90) to the bottom of the mold (61) of the bag opening device (6). The mold (61) descends and presses the bag body sheet material (90) downward to initially form the bag body into a U shape; D, the relative movement between the folding tongue plate (67) and the folding tongue piece (97) causes the folding tongue piece (97) to fold upward; E, the inner side insert (63) and the outer side insert (62) are respectively driven by the movement in the y-axis direction, driving the outer side piece (91) and the inner side piece (92) to fold inward, before the outer side insert (62) and the inner side insert (63) are completed folding, the folding tongue insert (67) moves downward and backs away; F. The inner insertion and stripping belt (65) first rotates in the forward direction for the first stroke, so that the height of the top edge of the inner insertion side piece (92) is lower than the bottom edge of the folding piece (96) at the top of the outer side piece (91); then the inner insertion and stripping belt (65) moves upward for the second stroke, driving the moving surface (94) of the bag body to move so that the inner insertion side piece (92) is inserted from bottom to top into the socket (95) formed between the outer side piece (91) and the folding piece (96).

17. The process for forming a center-sealed bag body with a staggered upper folded opening according to claim 16, characterized in that: The following steps are also included: G, the plywood (66) moves along the y-axis direction close to the mold (61), applying pressure to the paper bag seal, so that the seal at the bonding; H. The plywood (66) moves away from the mold (61), the inserted bag-removing belt (65) has a third stroke of forward rotation, and the fixed bag-removing belt (64) rotates synchronously, driving the bonded bag body downward to separate from the mold (61).

18. The process for forming a center-sealed bag body with a staggered upper folded opening according to claim 16, characterized in that: In step E, the fixed bag stripping belt (64) rotates synchronously, driving the fixed surface (93) to move, thereby achieving pre-deformation of the bag body.

19. The process for forming a center-sealed bag body with a staggered upper folded opening according to claim 16, wherein: In step F, when the inner side piece (92) is inserted into the socket (95) from bottom to top, there is a gap of no more than 1 mm between the top of the inner side piece (92) and the fold line at the top of the socket (95).

20. The process for forming a center-sealed bag body with a staggered upper folded opening according to claim 17, wherein: In step H, before the third stroke, the inner insertion and bag removal belt (65) retreats from the bag opening position to the bag removal position.

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