A packaging bag filling interface and its working method

Abstract

The present invention discloses a filling interface for a packaging bag and its working method. An upper cover plate and a sliding carriage plate are provided on an interface bracket. A material guiding interface is provided on the upper cover plate. The lower end of the material guiding interface passes through the upper cover plate and is sleeved and connected with a filling guide cylinder. Two turning doors that make relative sector-shaped rotations are provided at the lower end of the filling guide cylinder. When the two turning doors are closed, they form a cone with a narrow bottom and a wide top. Bag mouth clamping mechanisms are respectively provided on the sliding carriage plates above both sides of the two turning doors. A vertical pushing cylinder is provided on the upper cover plate. The vertical pushing cylinder is connected to the sliding carriage plate to push the filling guide cylinder together with the bag mouth clamping mechanisms to move vertically up and down. A horizontal pushing cylinder is provided on the sliding carriage plate. The horizontal pushing cylinder pushes the two bag mouth clamping mechanisms to make horizontal relative reciprocating movements. The present invention eliminates the occurrence of material leakage. The left and right movable claws tighten and seal the mouth of the packaging bag after loading, which not only prevents the materials in the moving packaging bag from vibrating and flowing out of the bag, but also facilitates the subsequent sealing process.

Description

Technical Field

[0001] The present invention relates to a filling interface for a packaging bag and a working method thereof. Background Art

[0002] A very important process in the automatic production line for filling granular materials is how to put the material bag onto the filling port and fill the material into the material bag. In the early filling interfaces, only the opening of the bag mouth was emphasized, and there was always a situation of material leakage through the gap between the periphery of the packaging bag mouth and the feeding port during the filling process. Therefore, how to improve the material leakage caused by the design defects of the existing filling interfaces is a problem to be solved by the present invention. Summary of the Invention

[0003] The purpose of the present invention is to provide a filling interface for a packaging bag and a working method thereof. By setting grippers that can move up and down and left and right, the packaging bag mouth is put onto the feeding port, sealing the gap between the packaging bag mouth and the feeding port, eliminating the generation of material leakage. And the grippers that can move left and right tighten and seal the packaging bag mouth after filling, which not only prevents the material in the moving packaging bag from vibrating and flowing out of the bag, but also facilitates the subsequent sealing process.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A filling interface for a packaging bag is located between a bag supply device and a bag mouth sealing machine, and includes an interface bracket. A feeding interface is provided on the interface bracket, and the feeding interface is connected to a material weighing and feeding device. Among them, the interface bracket is provided with an upper cover plate and a sliding plate. The upper cover plate and the sliding plate are parallel to each other, with the feeding interface fixed on the upper cover plate. The upper end of the feeding interface is connected to the material weighing and feeding device, and the lower end of the feeding interface passes through the upper cover plate and is sleeved and connected to a filling guide cylinder with a rectangular cross-section. The filling guide cylinder is fixedly sleeved with the sliding plate. Two turning doors that make relative sector-shaped rotations are provided at the lower end of the filling guide cylinder. The turning doors are arranged below the sliding plate. On the outside of the two turning doors, bag mouth side grippers that can be opened and closed are respectively provided. When the two turning doors are closed, they form a cone with a narrow bottom and a wide top. The sliding plate is provided with bag mouth clamping mechanisms on both sides where the two turning doors of the filling guide cylinder open and close relatively. A vertical push cylinder is provided on the upper cover plate and extends downward. The vertical push cylinder is connected to the sliding plate to push the filling guide cylinder together with the bag mouth clamping mechanism to move vertically up and down. Two horizontal push cylinders are provided on the sliding plate, and the two horizontal push cylinders are respectively connected to push the two bag mouth clamping mechanisms to make horizontal relative reciprocating movements.

[0006] The further solution of the scheme is that: the feeding interface is connected to the upper cover plate of the interface bracket through a flange. The filling guide cylinder is sleeved on the outside of the lower end of the feeding interface. The vertical push cylinders are respectively provided on both sides of the feeding interface on the upper cover plate. The vertical telescopic arms of the vertical push cylinders are connected to the sliding plate, and the filling guide cylinder is driven by the sliding plate to make a sleeved movement with the feeding interface.

[0007] A further solution is that the flip door is a dustpan-shaped flip door with two sides bent and flipped up but without a rear baffle. When the flip door rotates in a fan-shaped manner, the two sides are staggered with each other so that the two sides are always in a sealed state during the opening process of the flip door.

[0008] The solution is further as follows: the flip door is hingedly connected to the filling guide cylinder through a rotating shaft, a flip door pushing cylinder and a bag opening clamp pushing cylinder are arranged on the outer side of the filling guide cylinder above the flip door, the flip door pushing cylinder and the bag opening clamp pushing cylinder are respectively hingedly connected to the filling guide cylinder through the rotating shaft, the telescopic arm of the flip door pushing cylinder is hingedly connected to the flip door through the rotating shaft, the telescopic arm of the bag opening clamp pushing cylinder is hingedly connected to a clamp arm of the bag opening clamp through the rotating shaft, and the other clamp arm of the bag opening clamp is the side wall of the flip door.

[0009] The scheme is further as follows: a central through hole is provided in the middle of the slide plate, the central through hole is fixed with the filling guide cylinder, downward vertical support plates are respectively provided on both sides of the central through hole of the slide plate, a horizontal slide rail is provided on the lower end surface of the slide plate between the vertical support plate and the central through hole, a horizontal slider is hung on the horizontal slide rail, the bag mouth clamping mechanism is fixed on the horizontal slider, the horizontal pushing cylinder is fixed on the vertical support plate, the horizontal telescopic arm of the horizontal pushing cylinder is connected to the horizontal slider to drive the horizontal slider to move horizontally along the horizontal slide rail, vertical guide rails are provided downwardly at both ends of the upper cover plate, vertical sliders are provided on both side ends of the slide plate, the vertical slider is placed on the vertical guide rails, the vertical telescopic arm of the vertical pushing cylinder is connected to the slide plate to drive the slide plate to move vertically up and down along the vertical guide rails.

[0010] The solution is further as follows: eccentric holes are respectively arranged on both sides of the central hole of the slide plate, and the vertical telescopic arm of the vertical pushing cylinder passes through the eccentric holes and is connected to the vertical support plate through a horizontal connecting column, and the vertical telescopic arm drives the slide plate to move vertically up and down along the vertical guide rail through the vertical support plate.

[0011] The scheme is further as follows: the bag mouth clamping mechanism includes a mechanism bracket, on which a clamping cylinder and a clamping claw that performs relative opening and closing movements through a rotating shaft are fixedly arranged, and a telescopic arm of the clamping cylinder is connected to the opening and closing clamping claw.

[0012] A packaging bag filling interface working method is based on the above packaging bag filling interface working method, the slide plate is lifted to the initial state, the bag supply device opens the middle of the bag mouth and sends it to the lower side of the packaging bag filling interface, the packaging bag mouth opened in the middle is facing the lower end of the flip door, one side of the bag mouth outside the flip door is clamped open, the bag mouth clamping mechanism moves inward relatively to the initial state, the clamping claws of the bag mouth clamping mechanism are opened, and the material weighing and feeding device puts the weighed material into the filling guide cylinder, characterized in that the working method is:

[0013] Step 1: Lower the carriage plate so that the lower end of the filling guide cylinder is inserted into the opening of the bag mouth of the conical turning door. Close the bag mouth clamp on the outer side of the turning door to press the two sides of the bag mouth tightly against the turning door. The jaws of the bag mouth clamping mechanism close and clamp the two sides of the bag mouth on the outer side of the turning door to hold the bag.

[0014] Step 2: Open the turning door for a delayed period, introduce the material into the bag, and then close the turning door.

[0015] Step 3: Release the bag mouth clamp on the outer side of the turning door. The two bag mouth clamping mechanisms move horizontally in opposite directions to straighten and seal the bag mouth.

[0016] Step 4: A transmission mechanism supports the bag. After the jaws of the bag mouth clamping mechanism are released, the bag with the bag mouth straightened and sealed is sent to the bag mouth sealing machine. At the same time, after the jaws are released, the bag mouth clamping mechanism returns to its initial state, and the carriage plate is lifted to its initial state.

[0017] A further improvement of the solution is that the bag feeding device expands the middle of the bag mouth and sends it to the lower side of the bag filling interface, synchronously with the material weighing and feeding device putting the weighed material into the filling guide cylinder.

[0018] A further improvement of the solution is that the turning door is a dustpan-shaped turning door with its two side edges bent and turned up but without a rear baffle. When the fan-shaped turning occurs, the two side edges of the two turning doors intersect with each other, so that the two side surfaces are always in a sealed state during the opening process of the turning door.

[0019] The beneficial effects of the present invention are as follows: By setting the left and right movable jaws to put the bag mouth over the material discharging port, the gap between the bag mouth and the material discharging port is sealed, eliminating the occurrence of material leakage. Moreover, the left and right movable jaws tighten and seal the bag mouth after filling, which not only prevents the material in the bag from vibrating and flowing out during the movement after filling, but also facilitates the subsequent sealing process.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the position of the bag filling interface of the present invention;

[0022] Figure 2 is a schematic diagram of the overall front structure of the bag filling interface of the present invention;

[0023] Figure 3 is a schematic diagram of the overall internal front structure of the bag filling interface of the present invention;

[0024] Figure 4 is a schematic diagram of the structure of the upper cover plate of the interface bracket of the present invention;

[0025] Figure 5It is a structural schematic diagram of the filling guide cylinder installed on the upper cover plate of the interface bracket of the present invention;

[0026] Figure 6 It is a schematic diagram of the filling guide cylinder structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the bag opening clamping mechanism structure of the present invention. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] A packaging bag filling interface, such as Figure 1 As shown, the packaging bag filling interface 1 is located between the bag supply device 2 and the bag mouth sealing machine 3. The bag holding claw 201 of the bag supply device 2 can open the bag mouth and send it to the lower end of the packaging bag filling interface 1. There is a transmission mechanism 4 between the bag mouth sealing machine 3 and the packaging bag filling interface 1. The transmission mechanism 4 can be a conveyor belt. The transmission mechanism 4 sends the packaging bag filled with materials through the interface to the bag mouth sealing machine 3 for sealing.

[0030] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the packaging bag filling interface includes an interface bracket 101, and a material guide interface 5 is arranged on the interface bracket. Figure 1 As shown, the upper end of the material guide interface 5 is connected to the material weighing and placing device 6, and the material weighing and placing device is responsible for weighing the material. Figure 3 As shown, the interface bracket is provided with an upper cover plate 101 and a slide 15, and the slide 15 includes a slide plate 15-1, the upper cover plate 101 is on the upper slide plate 15-1 and the two are arranged parallel to each other, the material guide interface 5 is connected to the upper cover plate 101 of the interface bracket through a flange, the upper end of the material guide interface is connected with the material weighing and feeding device, and the lower end of the material guide interface 5 passes through the upper cover plate 101 and is connected with a filling guide cylinder 7 with a rectangular cross section, the filling guide cylinder 7 is fixedly sleeved with the slide plate 15-1, and the slide plate 15-1 drives the filling guide cylinder 7 to move up and down; and the filling guide cylinder 7 is slidably sleeved with the lower end of the material guide interface from the outside, as shown in FIG. Figure 6 As shown, two flip doors 8 that rotate in a fan shape relative to each other are arranged at the lower end of the filling guide cylinder 7. The flip door 8 is under the slide plate. The flip door is a dustpan-shaped flip door with two side edges 801 bent and flipped up but without a rear baffle. When the fan shape rotates, the two side edges of the two flip doors are staggered with each other so that the two side surfaces are always in a sealed state during the opening process of the flip door.

[0031] On the outer sides of the two turning doors, there are respectively provided with openable and closable bag mouth side clamps 9. Here, "side" refers to one of the two sides of the bag mouth. The bag mouth side clamp pushing cylinder 10 is hinged to the filling guide cylinder 7 through a rotating shaft. The telescopic arm 10-1 of the bag mouth side clamp pushing cylinder is hinged to one clamping arm 901 of the bag mouth side clamp through a rotating shaft. The other clamping arm of the bag mouth side clamp is the side wall 802 of the turning door. When the two turning doors 8 are closed, they form a conical shape with a pointed (flat) bottom and a wide top. As Figure 2 and Figure 3 shown, on the carriage plates 15-1 above the relatively opening and closing sides of the two turning doors of the filling guide cylinder, there are respectively provided with bag mouth clamping mechanisms 11. On the upper cover plate, there is a vertically downward pushing cylinder 13. The vertically pushing cylinder is connected to the carriage plate to drive the filling guide cylinder together with the bag mouth clamping mechanism to move vertically up and down. On the carriage plate, there are two horizontally pushing cylinders 12. The two horizontally pushing cylinders are respectively connected to push the two bag mouth clamping mechanisms to make horizontal relative reciprocating movements. The turning door 8 is hinged to the filling guide cylinder through a rotating shaft. On the outer side surface of the filling guide cylinder above the turning door, there are provided with a turning door pushing cylinder 14 and a bag mouth side clamp pushing cylinder 10. The turning door pushing cylinder 14 is hinged to the filling guide cylinder 7 through a rotating shaft. The telescopic arm 14-1 of the turning door pushing cylinder 14 is hinged to the side wall 802 of the turning door 8 through a rotating shaft.

[0032] In the embodiment: As Figure 2 and Figure 3 shown, on the upper cover plate 101, on both sides of the material guiding interface 5, there are respectively provided with the vertically pushing cylinders 13. The vertical telescopic arm 13-1 of the vertically pushing cylinder 13 is connected to the carriage plate 15-1. The vertically pushing cylinder drives the filling guide cylinder to be sleeved and movable with the material guiding interface through the carriage plate.

[0033] Among them: As Figure 3 , Figure 4 , Figure 5As shown, a central through hole 15-2 is provided in the middle of the slide plate 15-1, and reinforcement plates 15-3 are provided on both sides of the slide plate. The central through hole 15-2 is fixedly sleeved with the filling guide tube 7, and downward vertical support plates 15-4 are respectively provided on both sides of the central through hole of the slide plate. A horizontal slide rail 15-5 is provided on the lower end surface of the slide plate between the vertical support plate and the central through hole, and a horizontal slider 15-6 is hung on the horizontal slide rail. The bag mouth clamping mechanism 11 is fixed on the horizontal slider 15-6, and the horizontal push cylinder 12 is fixed on the vertical support plate. The horizontal telescopic arm 12-1 of the horizontal pushing cylinder is connected to the horizontal slider 15-6 to drive the horizontal slider 15-6 to move horizontally along the horizontal slide rail 15-5. Vertical guide rails 16 are supported downwardly at both ends of the upper cover plate 101 of the interface bracket. Vertical sliders 16-1 are connected to both side ends of the slide plate 15-1. The vertical slider 16-1 is placed on the vertical guide rail 16. The vertical telescopic arm 13-1 of the vertical pushing cylinder 13 fixed on the upper cover plate 101 is connected to the slide plate 15-1 to push the slide plate 15-1 to move vertically up and down along the vertical guide rail 16.

[0034] Among them: Figure 4 As shown, eccentric through holes 15-4 (through holes that are empty and deviate from the center) are respectively arranged on both sides of the central through hole 15-2 of the slide plate. The vertical telescopic arm 13-1 of the vertical pushing cylinder 13 passes through the eccentric through hole 15-4 and is connected to the vertical support plate 15-4 through the horizontal connecting column 17. The vertical telescopic arm 13-1 drives the slide plate 15-1 to move vertically up and down along the vertical guide rail through the vertical support plate 15-4, thereby driving the bag mouth clamping mechanism 11 to move vertically up and down.

[0035] like Figure 7 As shown: the bag mouth clamping mechanism 11 includes a mechanism bracket 11-1, on which a clamping cylinder 11-2 and a clamping claw 11-3 that performs relative opening and closing movements through a rotating shaft are fixedly arranged, and a telescopic arm of the clamping cylinder is connected to the opening and closing clamping claw 11-3.

[0036] Embodiment 2:

[0037] A packaging bag filling interface working method is based on the packaging bag filling interface working method described in Example 1, and therefore, the content in Example 1 should be regarded as the content of this embodiment.

[0038] First, the carriage plate is lifted to the initial state, the bag feeding device opens the middle of the bag opening and sends it to the lower side of the filling interface of the packaging bag, the packaging bag opening opened in the middle faces the lower end of the flip door, one side of the bag opening outside the flip door is clamped open, the bag opening clamping mechanism moves inward relatively to the initial state, the clamping claws of the bag opening clamping mechanism are opened, and the material weighing and feeding device puts the weighed material into the filling guide cylinder, wherein the working method is:

[0039] Step 1: Lower the carriage plate. The lower end of the filling guide cylinder is inserted into the opening of the bag mouth of the conical turning door. Close the bag edge clamp on the outer side of the turning door to tightly press the two bag edges of the bag mouth against the turning door. The jaws of the bag mouth clamping mechanism close and clamp the two sides of the bag mouth on the outer side of the turning door to hold the bag.

[0040] Step 2: Open the turning door for a delayed period of time. After introducing the material into the bag, close the turning door. The delayed time is 2 to 4 seconds.

[0041] Step 3: Loosen the bag edge clamp on the outer side of the turning door. The two bag mouth clamping mechanisms move horizontally in opposite directions outward to straighten and seal the bag mouth.

[0042] Step 4: A transmission mechanism supports the bag. After the jaws of the bag mouth clamping mechanism are loosened, the bag with the bag mouth straightened and sealed is sent to the bag mouth sealing machine. At the same time, after the jaws are loosened, the bag mouth clamping mechanism returns to its initial state, and the carriage plate is lifted to its initial state.

[0043] Among them: The bag supply device spreads the middle of the bag mouth and sends it to the lower side of the bag filling interface, which is synchronized with the material weighing and feeding device putting the weighed material into the filling guide cylinder.

[0044] As described in Embodiment 1: The turning door is a dustpan-shaped turning door with both sides bent and turned up but without a rear baffle. When the fan-shaped turning occurs, the two sides of the two turning doors intersect with each other, so that the two side surfaces are always in a sealed state during the opening process of the turning door.

[0045] In the above embodiment, when the two turning doors 8 are closed, they form a cone with a narrow bottom and a wide top, which is convenient for the bag to be sleeved. Since the turning door is a dustpan-shaped turning door with both sides 801 bent and turned up but without a rear baffle, when the fan-shaped turning occurs, the two sides of the two turning doors intersect with each other, so that the two side surfaces are always in a sealed state during the opening process of the turning door. The feeding port seals the gap between the bag mouth and the feeding port, eliminating the occurrence of material leakage. And the left and right movable bag mouth clamping mechanism 11 tightens and seals the bag mouth after loading, which not only prevents the material in the moving bag from vibrating out of the bag after loading, but also facilitates the subsequent sealing process.

Claims

1. A packaging bag filling interface is located between a bag supply device and a bag mouth sealing machine, and includes an interface bracket. A material guiding interface is arranged on the interface bracket, and the material guiding interface is connected with a material weighing and feeding device. It is characterized in that The interface support is provided with an upper cover plate and a carriage plate. The upper cover plate and the carriage plate are parallel to each other, with the upper cover plate on top and the carriage plate below. The material guiding interface is fixed on the upper cover plate. The upper end of the material guiding interface is connected to the material weighing and feeding device. The lower end of the material guiding interface passes through the upper cover plate and is sleeved and connected to a filling guide cylinder with a rectangular cross-section. The filling guide cylinder is fixedly sleeved with the carriage plate. The lower end of the filling guide cylinder is provided with two flip doors that rotate in opposite sectors. The flip doors are arranged below the carriage plate. On the outer sides of the two flip doors, there are respectively bag mouth side clamps that can be opened and closed. When the two flip doors are closed, they form a cone with a pointed bottom and a wide top. On both sides of the two flip doors of the filling guide cylinder where they open and close relatively, the carriage plate is provided with bag mouth clamping mechanisms. On the upper cover plate, there is a vertical push cylinder facing downwards. The vertical push cylinder is connected to the carriage plate to push the filling guide cylinder together with the bag mouth clamping mechanism to move vertically up and down. On the carriage plate, there are two horizontal push cylinders. The two horizontal push cylinders are respectively connected to push the two bag mouth clamping mechanisms to make horizontal relative reciprocating movements; A central through hole is arranged in the middle of the carriage plate. The central through hole is fixedly sleeved with the filling guide cylinder. On both sides of the central through hole of the carriage plate, there are respectively vertical support plates facing downwards. Between the vertical support plates and the central through hole on the lower end surface of the carriage plate, there is a horizontal slide rail. A horizontal slider is hung on the horizontal slide rail. The bag mouth clamping mechanism is fixed on the horizontal slider. The horizontal push cylinder is fixed on the vertical support plate. The horizontal telescopic arm of the horizontal push cylinder is connected to the horizontal slider to drive the horizontal slider to move horizontally along the horizontal slide rail. On both sides of the upper end of the upper cover plate, there are vertical guide rails facing downwards. On both sides of the carriage plate, there are vertical sliders. The vertical sliders are placed on the vertical guide rails. The vertical telescopic arm of the vertical push cylinder is connected to the carriage plate to push the carriage plate to move vertically up and down along the vertical guide rails; The flip door is a dustpan-shaped flip door with its two side edges bent and turned up but without a rear baffle. When rotating in a sector shape, the two side edges of the two flip doors intersect with each other, so that the two side surfaces are always in a sealed state during the opening process of the flip doors.

2. The packaging bag filling interface according to claim 1, characterized in that, The material guiding interface is connected to the upper cover plate of the interface support through a flange. The filling guide cylinder is sleeved from the outside with the lower end of the material guiding interface. On both sides of the material guiding interface, the upper cover plate is respectively provided with the vertical push cylinder. The vertical telescopic arm of the vertical push cylinder is connected to the carriage plate, and drives the filling guide cylinder to be sleeved and move relative to the material guiding interface through the carriage plate.

3. The packaging bag filling interface according to claim 1, characterized in that, The flip door is hinged to the filling guide cylinder through a rotating shaft. On the outer side surface of the filling guide cylinder above the flip door, there are a flip door push cylinder and a bag mouth side clamp push cylinder. The flip door push cylinder and the bag mouth side clamp push cylinder are respectively hinged to the filling guide cylinder through a rotating shaft. The telescopic arm of the flip door push cylinder is hinged to the flip door through a rotating shaft. The telescopic arm of the bag mouth side clamp push cylinder is hinged to one clamping arm of the bag mouth side clamp through a rotating shaft. The other clamping arm of the bag mouth side clamp is the side wall of the flip door.

4. The packaging bag filling interface according to claim 1, wherein, Eccentric through holes are respectively arranged on both sides of the central through hole of the carriage plate. The vertical telescopic arm of the vertical push cylinder passes through the eccentric through hole and is connected to the vertical support plate through a horizontal connecting column. The vertical telescopic arm drives the carriage plate to move vertically up and down along the vertical guide rails through the vertical support plate.

5. The packaging bag filling interface according to claim 1, wherein The bag opening clamping mechanism comprises a mechanism bracket, on which a clamping cylinder and a clamping claw that performs relative opening and closing movements through a rotating shaft are fixedly arranged, and a telescopic arm of the clamping cylinder is connected to the clamping claw that opens and closes.

6. A packaging bag filling interface working method is based on the packaging bag filling interface working method of claim 1, the slide plate is lifted to the initial state, the bag feeding device opens the middle of the bag mouth and sends it to the lower side of the packaging bag filling interface, the packaging bag mouth opened in the middle is facing the lower end of the flip door, the bag mouth outside the flip door is clamped open, the bag mouth clamping mechanism moves inward relatively to the initial state, the clamping claws of the bag mouth clamping mechanism are opened, and the material weighing and feeding device puts the weighed material into the filling guide cylinder, characterized in that The working method is: Step 1: Move the slide plate downward, insert the conical flip door at the lower end of the filling guide into the open bag mouth, close the bag mouth outside the flip door and clamp the two sides of the bag mouth tightly against the flip door, and the clamping claws of the bag mouth clamping mechanism close the two sides of the bag mouth outside the flip door to clamp the bag; Step 2: Open the flip door for a delay period, import the material into the packaging bag, and then close the flip door; Step 3: Release the bag opening clamp on the outside of the flip door, and move the two bag opening clamping mechanisms horizontally and outward in opposite directions to straighten and seal the bag opening; Step 4: A transmission mechanism holds the packaging bag, and after the bag mouth clamping mechanism releases the clamping claws, the packaging bag with the bag mouth stretched and closed is sent to the bag mouth sealing machine. At the same time, after the clamping claws are released, the bag mouth clamping mechanism returns to its initial state, and the slide plate is lifted to its initial state.

7. The method according to claim 6, wherein The bag supply device opens the middle of the bag opening and sends it to the lower side of the filling interface of the packaging bag, and the material weighing and feeding device puts the weighed material into the filling guide cylinder synchronously.

8. The method according to claim 6, wherein The flip door is a dustpan-shaped flip door with two sides bent and flipped up but without a rear baffle. When the flip door rotates in a fan-shaped manner, the two sides of the two flip doors are staggered with each other so that the two sides are always in a sealed state during the opening process of the flip door.

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