Hot-bonding bottom sealing equipment for square-bottom valve bag production

Abstract

The utility model relates to the technical field of square-bottom valve bag production, in particular to hot-bonding bottom sealing equipment for square-bottom valve bag production, which comprises a rack, a hollow turntable arranged at the top end of the rack, a plurality of supporting inner molds arranged at the top end of the hollow turntable, square-bottom valve bags sleeved on the outer sides of the supporting inner molds, an edge folding component arranged at the top of one supporting inner mold, and an edge folding component arranged at the bottom of the other supporting inner mold. The top of the edge folding assembly is provided with a hot pressing assembly, the hot pressing assembly comprises a hollow pressing plate and a heating plate fixedly arranged at the top of the hollow pressing plate, and the position, located on one side of the hollow rotating disc, of the top end of the rack is provided with a storage assembly storing bottom-attached flat bags; and the hollow pressing plate heated by the heating plate is used for carrying out hot bonding on the square bottom valve bag and the bottom-attached flat bag. According to the utility model, the emission deviation of the square-bottom valve bag and the bottom-attached flat bag is prevented, the hot-sticking bottom sealing quality of the square-bottom valve bag is improved, and the sealing performance of the bottom of the valve bag is prevented from being influenced.

Description

Technical Field

[0001] This utility model relates to the field of square bottom valve bag production technology, and in particular to a heat-sealing bottom sealing device for producing square bottom valve bags. Background Technology

[0002] Square-bottom valve bags are a common type of packaging bag, typically used for powdery or granular materials such as cement and fertilizer. The hot-sealing process for square-bottom valve bags is a manufacturing method that achieves a sealed bottom through hot-melt technology. High-temperature hot air or hot-pressing equipment is used to melt and bond the bottom material (such as thermoplastic materials like polypropylene and polyethylene), forming a seamless sealed structure. This method features high strength, environmental friendliness, and high-efficiency production.

[0003] For example, the patent disclosed in the prior art publication number CN111619162B discloses a heat-sealing bottom machine for valve bag production. First, the bottom edge of the valve bag is folded, then the bottom-attached flat bag is conveyed onto the valve bag, and finally the bottom-attached flat bag is heat-pressed to the bottom wall of the valve bag to achieve heat-sealing bottom of the square-bottom valve bag.

[0004] Currently, in practical use, existing technologies involve conveying the bottom-mounted flat bags via a conveyor and causing them to fall onto the valve bag. However, the bottom-mounted flat bags are prone to shifting position on the valve bag, and the shifted bottom-mounted flat bags, after being heat-pressed with the valve bag, can easily affect the sealing of the bottom of the valve bag. Utility Model Content

[0005] To address the problems mentioned in the background section, this utility model provides the following technical solution:

[0006] A heat-sealing device for producing square-bottom valve bags includes a frame, a hollow turntable at the top of the frame, and multiple supporting inner molds at the top of the hollow turntable. The square-bottom valve bag is fitted onto the outside of the supporting inner molds, and one of the supporting inner molds has a folding assembly at the top for folding the bottom of the square-bottom valve bag.

[0007] The top of the folding assembly is equipped with a hot pressing assembly, which includes a hollow pressure plate and a heating plate fixed on the top of the hollow pressure plate. The top of the frame is equipped with a storage assembly containing bottom-attached flat bags on one side of the hollow turntable. After the hollow pressure plate picks up the bottom-attached flat bags from the storage assembly and transfers them to the folded square bottom valve bag, the hollow pressure plate, heated by the heating plate, heat-bonds the square bottom valve bag and the bottom-attached flat bags together.

[0008] Furthermore, a support rod is fixed to the top of the heating plate, and multiple suction holes communicating with its inner cavity are opened at the bottom of the hollow pressure plate to facilitate the adsorption of the bottom-mounted flat bag; an air outlet pipe and an air inlet pipe are fixed to the rear end of the hollow pressure plate, and the ends of the air outlet pipe and the air inlet pipe away from the hollow pressure plate both pass through the heating plate and extend to the top of the heating plate. The air outlet pipe is used to connect to a negative pressure fan, and the air inlet pipe is used to connect to a hot air fan; when the negative pressure fan draws air into the hollow pressure plate through the air outlet pipe, the hollow pressure plate can adsorb the bottom-mounted flat bag; when the hot air fan sprays hot air into the hollow pressure plate through the air inlet pipe, it is used to assist in the heat adhesion of the square bottom valve bag to the bottom-mounted flat bag.

[0009] Furthermore, a drive structure for driving the hot pressing assembly to move is provided on the rear side of the top of the frame.

[0010] Furthermore, the storage component includes a base fixed to the top of the rack, an outer frame fixed to the top of the base, multiple flat bags stacked inside the outer frame, and the size of the heating plate being adapted to the inner cavity size of the outer frame to facilitate limiting the lifting and lowering movement of the heating plate.

[0011] Furthermore, the outer frame is provided with four limiting rods, and the stacked bottom flat bags are placed between the four limiting rods; the limiting rods are located at the top of the base, and the bottom end of the limiting rods extends into the interior of the base and is slidably connected to the base. The bottom end of the limiting rods is connected to the bottom end of the interior of the base by an elastic element. When the heating plate and the hollow pressure plate enter the outer frame, since the limiting rods can slide inside the base, they will not hinder the lifting and lowering movement of the heating plate and the hollow pressure plate.

[0012] Furthermore, the folding assembly includes a rectangular frame, and folding plates are provided on all four sides inside the rectangular frame. The four folding plates are driven to move horizontally by electric push rods fixed on the four sides of the outer wall of the rectangular frame. The four folding plates are all located on the outer side of the top of one of the supporting inner molds.

[0013] Furthermore, when the hot pressing assembly enters the rectangular frame, the outer wall of the heating plate contacts the inner side of the four folded edge plates, which facilitates limiting the lifting and lowering movement of the heating plate.

[0014] Furthermore, two electric push rods are fixed to the top of the frame, and the two electric push rods are respectively fixed to the rear end of the rectangular frame for adjusting the height of the folding assembly.

[0015] Furthermore, the inner support mold is connected to the interior of the hollow turntable, and the outer side of the inner support mold has multiple through holes communicating with its inner cavity, which facilitates the inner support mold to adsorb and fix the square bottom valve bag.

[0016] Furthermore, the bottom end of the hollow turntable is fixedly connected to an air pipe one, and an air pipe two is fixedly installed inside the frame, with the top end of the air pipe two extending out of the top end of the frame. The air pipe one and the air pipe two are rotatably connected, and the air pipe one is driven to rotate by a drive device inside the frame to drive the hollow turntable to rotate so as to change the position of the inner mold support.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. When the hot pressing assembly picks up the bottom flat bag from the storage assembly, the outer frame limits the movement of the hot pressing assembly, so that the hot pressing assembly accurately picks up the bottom flat bag. When the square bottom valve bag is hot-bonded to the bottom flat bag, the movement of the hot pressing assembly is limited by four folding plates to prevent the hollow pressure plate and the bottom flat bag on it from shifting, thereby improving the hot-bonding and sealing quality of the square bottom valve bag and avoiding affecting the sealing performance of the bottom of the valve bag.

[0019] 2. The square bottom valve bag is fitted onto the inner support mold. The inner support mold can hold and fix the square bottom valve bag in place. At the same time, when the square bottom valve bag is folded, the inner support mold can hold and fix the folded side of the square bottom valve opening, preventing the edge of the square bottom valve opening from lifting after folding, thus ensuring the quality of the heat-sealed bottom.

[0020] 3. When the air is drawn out from the hollow pressure plate of the hot pressing component, it is easy for the hollow pressure plate to adsorb the bottom flat bag, thus facilitating the transportation of the bottom flat bag. When hot air is sprayed into the hollow pressure plate, the heat can assist in the hot bonding of the square bottom valve bag and the bottom flat bag, improving the hot bonding efficiency. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the present invention;

[0022] Figure 2 This is a structural diagram of the present invention after removing the hollow turntable and the supporting inner mold;

[0023] Figure 3 This is a diagram of the bottom structure of the hollow turntable of this utility model;

[0024] Figure 4 This is a structural diagram of the back of the hot-pressing assembly of this utility model;

[0025] Figure 5 This is a cross-sectional view of the storage component of this utility model;

[0026] Figure 6 This is a schematic diagram of the hot-pressing component entering the storage component according to this utility model;

[0027] Figure 7 This is a structural diagram of the hollow turntable, supporting inner mold, hot pressing assembly, and folding assembly of this utility model;

[0028] Figure 8This is a structural diagram of the hollow turntable, supporting inner mold, and folding edge assembly of this utility model;

[0029] Figure 9 This is a schematic diagram of the hot-pressing component entering the folding component of this utility model;

[0030] Figure 10 for Figure 9 Side view.

[0031] The following is a list of component names represented by the various reference numerals in the attached figures:

[0032] 1 frame, 2 hollow turntables, 21 air pipes;

[0033] 3. Support inner mold;

[0034] 4. Hot pressing assembly, 41. Heating plate, 42. Hollow press plate, 43. Support rod, 44. Air outlet pipe, 45. Air inlet pipe;

[0035] 5. Storage component, 51. Base, 52. Outer frame, 53. Limiting rod;

[0036] 6. Folded edge assembly, 61. Rectangular frame, 62. Folded edge plate, 63. Electric push rod one, 64. Electric push rod two;

[0037] 7. Drive structure, 8. Airway II. Detailed Implementation

[0038] The preferred embodiments of this utility model are described in detail below, and a clear and complete explanation is given in conjunction with the accompanying drawings.

[0039] like Figures 1-3 As shown, this utility model provides a heat-sealing bottom device for producing square-bottom valve bags, including a frame 1, a hollow turntable 2 at the top of the frame 1, and multiple supporting inner molds 3 at the top of the hollow turntable 2. The interior of the supporting inner molds 3 is connected to the interior of the hollow turntable 2, and multiple through holes communicating with its interior cavity are opened on the outside of the supporting inner molds 3. The square-bottom valve bag is sleeved on the outside of the supporting inner molds 3; an air pipe 21 is fixedly connected to the bottom of the hollow turntable 2.

[0040] In actual use, an air pipe 28 can be fixed inside the frame 1, with the top end of the air pipe 28 extending out of the top end of the frame 1. A vacuum pump is installed inside the frame 1, and the air inlet of the vacuum pump is connected to the air pipe 28. Then, the air pipe 121 and the air pipe 28 are rotatably connected through a sealed bearing. A motor and other driving equipment are also installed inside the frame 1. The output shaft of the motor is connected to the air pipe 121 for transmission (for example, using a gear set for transmission). The motor drives the air pipe 121 to rotate the hollow turntable 2, which facilitates the rotation of the inner mold support 3. At the same time, the operation of the vacuum pump creates a negative pressure inside the inner mold support 3, which facilitates the inner mold support 3 to adsorb and fix the square bottom valve pocket sleeve on its outside.

[0041] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, a folding assembly 6 is provided on the top of one of the supporting inner molds 3 for folding the bottom of the square bottom valve pocket; the folding assembly 6 includes a rectangular frame 61, and folding plates 62 are provided on the four sides inside the rectangular frame 61. The four folding plates 62 are driven to move horizontally by electric push rods 63 fixed on the four sides of the outer wall of the rectangular frame 61. The four folding plates 62 are all located on the top outer side of one of the supporting inner molds 3. Two electric push rods 64 are fixed at the top of the frame 1. The two electric push rods 64 are fixed to the rear end of the rectangular frame 61 respectively for adjusting the height of the folding assembly 6.

[0042] First, adjust the height of the rectangular frame 61 and the folding plate 62 using the electric push rod 64, so that the bottom end of the folding plate 62 is flush with the top end of the supporting inner mold 3. Then, the two electric push rods 63 on the left and right sides drive the two folding plates 62 to move and fold the left and right sides of the square bottom valve bag inward and flatten it. At the same time, the supporting inner mold 3 can be attracted and fixed to the left and right sides of the square bottom valve bag to prevent the left and right sides from lifting up. Then, the two folding plates 62 are reset. The two electric push rods 63 on the front and rear sides drive the two folding plates 62 to move and fold the front and rear sides of the square bottom valve bag inward and flatten it. At the same time, the supporting inner mold 3 can be attracted and fixed to the front and rear sides of the square bottom valve bag to prevent the front and rear sides from lifting up, ensuring the quality of subsequent heat sealing.

[0043] Then, as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, a hot pressing assembly 4 is provided on the top of the folding assembly 6. The hot pressing assembly 4 includes a hollow pressure plate 42 and a heating plate 41 fixed on the top of the hollow pressure plate 42. A support rod 43 is fixed on the top of the heating plate 41. The bottom of the hollow pressure plate 42 has multiple suction holes communicating with its inner cavity. The heating plate 41 can be a ceramic heating plate. Ceramic heating plates are available in ring and plate shapes and other specifications. They are reliable, have a long service life, are sturdy and durable, save energy, and have the advantages of easy installation, high temperature resistance, fast heat transfer, good insulation, and no limitation on model and size. The hollow pressure plate 42 is made of materials with good conductivity such as copper and aluminum.

[0044] The hollow pressure plate 42 is fixed with an air outlet pipe 44 and an air inlet pipe 45 at its rear end. The ends of the air outlet pipe 44 and the air inlet pipe 45 away from the hollow pressure plate 42 both pass through the heating plate 41 and extend to the top of the heating plate 41. The air outlet pipe 44 is used to connect to a negative pressure fan, and the air inlet pipe 45 is used to connect to a hot air fan.

[0045] The top of the frame 1 is located on one side of the hollow turntable 2 and is equipped with a storage component 5 for storing flat bags with attached bottoms. The storage component 5 includes a base 51 fixed to the top of the frame 1, and an outer frame 52 fixed to the top of the base 51. The size of the heating plate 41 is adapted to the inner cavity size of the outer frame 52. Four limiting rods 53 are provided inside the outer frame 52. The stacked flat bags with attached bottoms are placed between the four limiting rods 53. The limiting rods 53 are located at the top of the base 51 and the bottom end of the limiting rods 53 extends into the interior of the base 51 and is slidably connected to the base 51. The bottom end of the limiting rods 53 is connected to the bottom end of the interior of the base 51 by an elastic element, which can be a spring. When the heating plate 41 and the hollow pressure plate 42 enter the outer frame 52, the limiting rods 53 can slide inside the base 51, so they will not hinder the lifting and lowering movement of the heating plate 41 and the hollow pressure plate 42.

[0046] A drive structure 7 for driving the hot pressing assembly 4 to move is also provided at the rear top of the frame 1. This invention provides an example of such a drive structure 7. Figures 1-2 As shown, a vertical linear module is fixed at the top of the frame 1, a horizontal linear module is fixed in front of the vertical linear module, and an electric cylinder is fixed on the horizontal linear module. The electric cylinder is fixed to the support rod 43. The horizontal linear module is used to drive the hot pressing assembly 4 to move horizontally, the vertical linear module is used to drive the hot pressing assembly 4 to move vertically over a large distance, and the electric cylinder is used to drive the hot pressing assembly 4 to move vertically over a small distance. This invention is not limited to the above-mentioned structure. Other structures that can drive the hot pressing assembly 4 to move horizontally and vertically are all within the protection scope of this invention.

[0047] Multiple flat bags with attached bottoms are stacked between four limiting rods 53 within the outer frame 52. The horizontal linear module first drives the hot-pressing assembly 4 to move above the storage assembly 5, then the vertical linear module drives the hot-pressing assembly 4 down to the port of the outer frame 52. Next, an electric cylinder drives the support rod 43, heating plate 41, and hollow pressure plate 42 into the outer frame 52. Under the constraint of the outer frame 52, the heating plate 41 slides down along the inner wall of the outer frame 52. Then, the folding plate 62 enters between the four limiting rods 53, which limit the support rod 43 until the hollow pressure plate 42 contacts the topmost flat bag with attached bottoms. Figure 6 As shown;

[0048] Simultaneously, when the negative pressure fan draws air from the hollow pressure plate 42 through the air outlet pipe 44, the hollow pressure plate 42 can adsorb the topmost bottom flat bag. Then, the hot pressing assembly 4 moves out of the storage assembly 5. The horizontal linear module drives the hot pressing assembly 4 to carry the bottom flat bag to the top of the folded valve bag. Then, the vertical linear module drives the hot pressing assembly 4 to move downward, so that the hot pressing assembly 4 enters the rectangular frame 61. At this time, the outer wall of the heating plate 41 contacts the inner side of the four folded plates 62. Figure 9 and Figure 10As shown, the lifting and lowering movements of the heating plate 41 and the hollow pressure plate 42 are limited to prevent the hollow pressure plate 42 and the bottom flat bag on it from shifting until the hollow pressure plate 42 conveys the bottom flat bag to the folded square bottom valve bag.

[0049] Then, the heating plate 41 heats the hollow pressure plate 42, and at the same time, the hot air blower sprays hot air into the hollow pressure plate 42 through the air inlet pipe 45, which together heat-bonds the square bottom valve bag and the bottom flat bag to achieve the heat-bonding and sealing of the square bottom valve bag.

[0050] Once the square-bottomed valve pocket on one of the supporting inner molds 3 is heat-bonded, the hollow turntable 2 rotates to sequentially transport the square-bottomed valve pocket on the next supporting inner mold 3 to the bottom of the folding assembly 6 for folding and heat-bonding sealing.

[0051] Based on the above description and accompanying drawings, those skilled in the art can understand and implement this utility model. Furthermore, any non-creative modifications made to this utility model by those skilled in the art without inventive effort are still within the protection scope of this utility model.

Claims

1. A heat-sealing device for producing square-bottom valve bags, comprising a frame (1), wherein a hollow turntable (2) is provided at the top of the frame (1), and a plurality of supporting inner molds (3) are provided at the top of the hollow turntable (2), and the square-bottom valve bag is fitted over the outer side of the supporting inner molds (3), characterized in that: One of the supporting inner molds (3) has a folding assembly (6) on top for folding the bottom of the square bottom valve pocket; The top of the folding assembly (6) is provided with a hot pressing assembly (4), which includes a hollow pressure plate (42) and a heating plate (41) fixedly disposed on the top of the hollow pressure plate (42); The top of the frame (1) is located on one side of the hollow turntable (2) and a storage component (5) for storing bottom flat bags is provided. After the hollow pressure plate (42) picks up the bottom flat bags in the storage component (5) and transfers them to the square bottom valve bag after folding, the hollow pressure plate (42) heated by the heating plate (41) heat-bonds the square bottom valve bag and the bottom flat bags.

2. The heat-sealing equipment for producing square-bottom valve bags according to claim 1, characterized in that: The heating plate (41) is fixed with a support rod (43) at the top, and the hollow pressure plate (42) has multiple suction holes communicating with its inner cavity at the bottom. The hollow pressure plate (42) is fixed with an air outlet pipe (44) and an air inlet pipe (45) at its rear end. The ends of the air outlet pipe (44) and the air inlet pipe (45) away from the hollow pressure plate (42) both pass through the heating plate (41) and extend to the top of the heating plate (41). The air outlet pipe (44) is used to connect to a negative pressure fan, and the air inlet pipe (45) is used to connect to a hot air fan. When the negative pressure fan draws air into the hollow pressure plate (42) through the air outlet pipe (44), the hollow pressure plate (42) can adsorb the bottom flat bag. When the hot air fan sprays hot air into the hollow pressure plate (42) through the air inlet pipe (45), it is used to assist in the heat adhesion of the square bottom valve bag and the bottom flat bag.

3. The heat-sealing equipment for producing square-bottom valve bags according to claim 1, characterized in that: The frame (1) has a drive structure (7) at the rear top for driving the hot pressing assembly (4) to move.

4. The heat-sealing equipment for producing square-bottom valve bags according to claim 1, characterized in that: The storage component (5) includes a base (51) fixed to the top of the rack (1), an outer frame (52) fixed to the top of the base (51), and multiple bottom flat bags stacked inside the outer frame (52). The size of the heating plate (41) is adapted to the size of the inner cavity of the outer frame (52).

5. The heat-sealing equipment for producing square-bottom valve bags according to claim 4, characterized in that: The outer frame (52) is provided with four limiting rods (53), and the stacked bottom flat bags are placed between the four limiting rods (53); The limiting rod (53) is located at the top of the base (51), and the bottom end of the limiting rod (53) extends into the interior of the base (51) and is slidably connected to the base (51). The bottom end of the limiting rod (53) is connected to the bottom end of the interior of the base (51) by an elastic element.

6. The heat-sealing equipment for producing square-bottom valve bags according to claim 1, characterized in that: The folding assembly (6) includes a rectangular frame (61), and folding plates (62) are provided on all four sides inside the rectangular frame (61). The four folding plates (62) are driven to move horizontally by electric push rods (63) fixed on the four sides of the outer wall of the rectangular frame (61). The four folding plates (62) are all located on the top outer side of one of the supporting inner molds (3).

7. The heat-sealing bottom equipment for producing square-bottom valve bags according to claim 6, characterized in that: When the hot pressing assembly (4) enters the rectangular frame (61), the outer wall of the heating plate (41) contacts the inner side of the four folded plates (62).

8. The heat-sealing equipment for producing square-bottom valve bags according to claim 6, characterized in that: Two electric push rods (64) are fixed at the top of the frame (1). The two electric push rods (64) are fixed to the rear end of the rectangular frame (61) respectively, and are used to adjust the height of the folding assembly (6).

9. The heat-sealing equipment for producing square-bottom valve bags according to claim 1, characterized in that: The inner support mold (3) is connected to the interior of the hollow turntable (2), and the outer side of the inner support mold (3) has multiple through holes that communicate with its inner cavity.

10. A heat-sealing bottom sealing device for producing square-bottom valve bags according to claim 1, characterized in that: The bottom end of the hollow turntable (2) is fixedly connected to an air pipe (21), and an air pipe (8) is fixedly installed inside the frame (1), with the top end of the air pipe (8) extending out of the top end of the frame (1). The air pipe (21) is rotatably connected to the air pipe (8), and the air pipe (21) is driven to rotate by a drive device inside the frame (1) to drive the hollow turntable (2) to rotate.

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