Square bottom bag making machine

Abstract

The present invention discloses a square bottom bag making machine, which is used to process a flat bag into a square bottom bag, and comprises a frame, a bag-stretching device and a sealing and cutting device; the bag-stretching device is slidably connected to the frame, and has a bag-stretching station and a sealing and cutting station during the sliding process, the bag-stretching device is used to stretch the flat bag to form a bag bottom and two bottom corners, and when the bag-stretching device moves to the sealing and cutting station, the bag-stretching device drives the bottom corners on the stretched flat bag to move to the sealing gap corresponding to the bottom corners in the sealing and cutting device; the sealing and cutting device is provided with a sealing gap corresponding to the bottom corners one by one, and the sealing and cutting device is used to clamp the connecting edge of the bottom corner in the sealing gap, and cut off and heat-seal the connecting edge. The present invention has a simple structure, low cost, and is easy to operate, and can simplify the production process of square bottom bags, reduce the production cost of square bottom bags, and increase the output of square bottom bags.

Description

Technical Field

[0001] The invention relates to a square bottom bag making machine. Background Art

[0002] At present, square bottom bags are widely used because they have a bottom surface that allows them to pack more materials and are very convenient for packing three-dimensional goods or square products. However, the square bottom bag making machines currently used to produce square bottom bags are large in size, occupy a large space, have a complex structure, and are expensive. In addition, the existing square bottom bag making machines have a complex process for producing square bottom bags, which increases the production cost of square bottom bags and severely limits the output. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a square bottom bag making machine which has a simple structure, low cost and is easy to operate, and can simplify the production process of square bottom bags, reduce the production cost of square bottom bags and increase the output of square bottom bags.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a square bottom bag making machine, which is used to process a flat bag into a square bottom bag, and comprises a frame, a bag support device and a sealing and cutting device; wherein,

[0005] The bag-holding device is slidably connected to the frame, and has a bag-holding station and a sealing and cutting station during the sliding process. When the bag-holding device is located at the bag-holding station, the bag-holding device is used to sleeve the plane bag, and is used to open the plane bag sleeved on the bag-holding device to form a bag bottom and two bottom corners, and the edges of the bottom corners connected to the bag bottom are connecting edges; when the bag-holding device moves to the sealing and cutting station, the bag-holding device drives the bottom corners on the opened plane bag to move to the sealing gaps in the sealing and cutting device corresponding to the bottom corners;

[0006] The sealing and cutting device is arranged on the frame and is provided with sealing gaps corresponding to the bottom corners one by one. The sealing and cutting device is used to clamp at least the connecting edge of the bottom corner in the sealing gap, cut off the connecting edge and heat-seal it.

[0007] A specific solution of the bag-holding device is further provided, wherein the planar bag comprises a front bag surface and a rear bag surface, and the bag-holding device comprises a sliding seat, a first bag-holding component, a second bag-holding component and a bag-holding driving mechanism; wherein,

[0008] The sliding seat is slidably connected to the frame;

[0009] The lower end of the first bag-supporting component and the lower end of the second bag-supporting component are both rotatably connected to the sliding seat;

[0010] The flat bag is used to be sleeved on the upper end of the first bag-supporting component and the upper end of the second bag-supporting component, so that the front bag surface abuts against the first bag-supporting component, and the rear bag surface abuts against the second bag-supporting component;

[0011] The bag-holding driving mechanism is arranged on the sliding seat and is connected to both the first bag-holding component and the second bag-holding component, so that the bag-holding driving mechanism drives the first bag-holding component and the second bag-holding component to rotate, thereby causing the upper end portion of the first bag-holding component and the upper end portion of the second bag-holding component to move backwards to hold open the front bag surface and the rear bag surface.

[0012] A specific solution of the bag-holding driving mechanism is further provided, and the bag-holding driving mechanism comprises:

[0013] A bag-supporting cylinder, the cylinder body of which is connected to the sliding seat;

[0014] A driving seat, the driving seat being connected to the piston rod of the bag-supporting cylinder;

[0015] At least one first driving rod, one end of which is hinged to the driving seat, and the other end of which is hinged to the upper end of the first bag-supporting member;

[0016] At least one second driving rod, one end of the second driving rod is hinged on the driving seat, and the other end of the second driving rod is hinged on the upper end of the second bag-supporting component, so that the bag-supporting cylinder drives the driving seat to rise and fall, and further drives the upper ends of the first bag-supporting component and the second bag-supporting component to move away from each other or towards each other.

[0017] Furthermore, the first driving rod and the second driving rod are each provided with two, the first bag-supporting component includes a first supporting rod portion corresponding to the first driving rod in a one-to-one manner, and the second bag-supporting component includes a second supporting rod portion corresponding to the second driving rod in a one-to-one manner; wherein,

[0018] The lower end of the first support rod portion and the lower end of the second support rod portion are both rotatably connected to the sliding seat;

[0019] One end of the first driving rod is hinged on the driving seat, and the other end of the first driving rod is hinged on the upper end of the corresponding first support rod portion;

[0020] One end of the second driving rod is hinged on the driving seat, and the other end of the second driving rod is hinged on the upper end of the corresponding second support rod part.

[0021] In order to further drive the sliding seat to slide on the frame, a handle is provided on the sliding seat.

[0022] Furthermore, the frame is provided with at least two guide rails;

[0023] The sliding seat is provided with a pulley group corresponding to the guide rail one by one;

[0024] The pulley block includes at least two pulleys slidably connected to corresponding guide rails.

[0025] In order to further improve the production efficiency of the square bottom bag, two bag-holding devices are provided, and the two bag-holding devices share one sealing and cutting station.

[0026] A specific solution of the sealing and cutting device is further provided, wherein the sealing and cutting device comprises a sealing and cutting mechanism corresponding to the bottom angles one by one, and the sealing and cutting mechanism comprises a fixed seat, a movable seat, a driving cylinder, a fusible cutting wire and a heat sealing wire; wherein,

[0027] The fixing seat is connected to the frame;

[0028] The movable seat is slidably connected to the frame, and the sealing gap is formed between the fixed seat and the sliding seat;

[0029] The fusible wire is connected to any one of the fixed seat and the movable seat and is located in the sealing gap;

[0030] The heat sealing wire is connected to any one of the fixed seat and the movable seat and is located in the sealing gap;

[0031] In the direction of the line connecting the two bottom corners, the heat sealing wire is closer to the bag bottom than the melting wire;

[0032] The cylinder body of the driving cylinder is connected to the frame, and the piston rod of the driving cylinder is connected to the movable seat, so that the driving cylinder drives the movable seat to move toward the fixed seat and press the connecting edge of the bottom angle onto the fusible wire and the heat-sealing wire, so that the fusible wire melts the connecting edge, and the heat-sealing wire heat-seals the connecting edge.

[0033] Furthermore, the square bottom bag making machine also includes a travel switch and a control circuit board; wherein,

[0034] The travel switch is arranged on the frame and is used to abut against the bag-supporting device moved to the sealing and cutting station to be triggered;

[0035] The input end of the control circuit board is connected to the travel switch, and the control circuit board is controlled and connected to the driving cylinder, the fusible wire and the heat-sealing wire, so that when the travel switch is triggered, the control circuit board controls the fusible wire and the heat-sealing wire to be energized and controls the driving cylinder to move.

[0036] Furthermore, the fusible wire is a heating wire with a circular cross-section, and the heat-sealing wire is a heating wire with a flat structure.

[0037] After adopting the above technical solution, the flat bag is sleeved on the upper end of the first bag-supporting component and the upper end of the second bag-supporting component, so that the front bag surface is against the first bag-supporting component, and the rear bag surface is against the second bag-supporting component; then the bag-supporting driving mechanism drives the upper end of the first bag-supporting component and the upper end of the second bag-supporting component to move in opposite directions to open the front bag surface and the rear bag surface, thereby forming the bag bottom and two bottom corners; then the bag-supporting device is pushed to slide to the sealing and cutting station, so that the bottom corner moves to the corresponding sealing gap; then the driving cylinder drives the movable seat to press the connecting edge of the bottom corner on the fusible wire and the heat-sealing wire, so that the fusible wire melts the connecting edge, and the heat-sealing wire heat-seals the connecting edge. The whole operation is extremely simple, which simplifies the production process of square bottom bags, thereby reducing the production cost of square bottom bags and increasing the output of square bottom bags. In addition, the square bottom bag making machine of the present invention is small in size, occupies little space, has a simple structure and is low in cost. In addition, there are two bag-stretching devices. When one of the bag-stretching devices is located at the sealing and cutting station, the flat bag can be put on the other bag-stretching device. The cooperation of the two bag-stretching devices further improves the production efficiency of the square bottom bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the square bottom bag making machine of the present invention;

[0039] Figure 2 It is a schematic structural diagram of the bag-supporting device of the present invention;

[0040] Figure 3 It is a schematic structural diagram of the sealing and cutting device of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the flat bag of the present invention. DETAILED DESCRIPTION

[0042] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0043] like Figures 1 to 4 As shown, a square bottom bag making machine is used to process a flat bag 1 into a square bottom bag, which includes a frame 2, a bag support device 100 and a sealing and cutting device 200; wherein,

[0044] The bag-holding device 100 is slidably connected to the frame 2, and has a bag-holding station and a sealing and cutting station during the sliding process. When the bag-holding device 100 is located at the bag-holding station, the bag-holding device 100 is used to sleeve the plane bag 1, and is used to open the plane bag 1 sleeved on the bag-holding device 100 to form a bag bottom 3 and two bottom corners 4, and the edges of the bottom corners 4 connected to the bag bottom 3 are connecting edges 5; when the bag-holding device 100 moves to the sealing and cutting station, the bag-holding device 100 drives the bottom corners 4 on the opened plane bag 1 to move to the sealing gap 6 in the sealing and cutting device 200 corresponding to the bottom corners 4;

[0045] The sealing and cutting device 200 is arranged on the frame 2 and is provided with a sealing gap 6 corresponding to the bottom corner 4 one by one. The sealing and cutting device 200 is used to clamp at least the connecting edge 5 of the bottom corner 4 in the sealing gap 6, and cut off and heat-seal the connecting edge 5. After the connecting edge 5 is cut off, the bottom corner 4 is cut off.

[0046] like Figure 1 , 2 As shown in , 4, the flat bag 1 includes a front bag surface 7 and a rear bag surface 8, and the bag-holding device 100 is, for example but not limited to, the following structure, which includes a sliding seat 9, a first bag-holding component 10, a second bag-holding component 11 and a bag-holding driving mechanism; wherein,

[0047] The sliding seat 9 is slidably connected to the frame 2;

[0048] The lower end of the first bag-supporting member 10 and the lower end of the second bag-supporting member 11 are both rotatably connected to the sliding seat 9;

[0049] The flat bag 1 is used to be sleeved on the upper end of the first bag-supporting member 10 and the upper end of the second bag-supporting member 11, so that the front bag surface 7 abuts against the first bag-supporting member 10, and the rear bag surface 8 abuts against the second bag-supporting member 11;

[0050] The bag-supporting driving mechanism is disposed on the sliding seat 9 and is connected to both the first bag-supporting component 10 and the second bag-supporting component 11, so that the bag-supporting driving mechanism drives the first bag-supporting component 10 and the second bag-supporting component 11 to rotate, thereby causing the upper end of the first bag-supporting component 10 and the upper end of the second bag-supporting component 11 to move in opposite directions to support the front bag surface 7 and the rear bag surface 8, thereby forming the bag bottom 3 and the two bottom corners 4.

[0051] like Figure 1 , 2 As shown in 4, the bag-supporting driving mechanism may be, for example but not limited to, the following structure, which includes:

[0052] A bag-supporting cylinder 12, the cylinder body of which is connected to the sliding seat 9;

[0053] A driving seat 13, wherein the driving seat 13 is connected to the piston rod of the bag-supporting cylinder 12;

[0054] At least one first driving rod 14, one end of the first driving rod 14 is hinged to the driving seat 13, and the other end of the first driving rod 14 is hinged to the upper end of the first bag-supporting member 10;

[0055] At least one second driving rod 15, one end of which is hinged on the driving seat 13, and the other end of which is hinged on the upper end of the second bag-supporting component 11, so that the bag-supporting cylinder 12 drives the driving seat 13 to rise and fall, thereby driving the upper end of the first bag-supporting component 10 and the upper end of the second bag-supporting component 11 to move away from or towards each other. Specifically, when the upper end of the first bag-supporting component 10 and the upper end of the second bag-supporting component 11 move away from each other to the expanded state, the front bag surface 7 and the rear bag surface 8 of the planar bag 1 are expanded to form the bag bottom 3 and the two bottom corners 4, and when the upper end of the first bag-supporting component 10 and the upper end of the second bag-supporting component 11 move towards each other to the closed state, it is convenient to put the planar bag 1 on the first bag-supporting component 10 and the second bag-supporting component 11, thereby allowing the first bag-supporting component 10 and the second bag-supporting component 11 to be inserted into the planar bag 1. In this embodiment, the sliding seat 9 may include an upper seat body 27 and a lower seat body, the upper seat body 27 is connected to the lower seat body through two connecting rods 28, the first bag-supporting component 10 and the second bag-supporting component 11 are both rotatably connected to the lower seat body, and the cylinder body of the bag-supporting cylinder 12 is connected to the upper seat body 27.

[0056] like Figure 1 , 2 As shown in FIG. 4 , the first driving rod 14 and the second driving rod 15 may each be provided with two, the first bag-supporting component 10 includes a first supporting rod portion 16 corresponding to the first driving rod 14 one by one, and the second bag-supporting component 11 includes a second supporting rod portion 17 corresponding to the second driving rod 15 one by one; wherein,

[0057] The lower end of the first support rod portion 16 and the lower end of the second support rod portion 17 are both rotatably connected to the sliding seat 9;

[0058] One end of the first driving rod 14 is hinged to the driving seat 13, and the other end of the first driving rod 14 is hinged to the upper end of the corresponding first support rod portion 16;

[0059] One end of the second driving rod 15 is hinged on the driving seat 13, and the other end of the second driving rod 15 is hinged to the upper end of the corresponding second support rod portion 17; specifically, the two first support rod portions 16 can also be connected by a first cross bar portion 29, and the two second support rod portions 17 can also be connected by a second cross bar portion 30, and the flat bag 1 is used to be sleeved on the upper ends of the two first support rod portions 16 and the upper ends of the two second support rod portions 17.

[0060] like Figure 1 , 2 As shown, a handle 18 may be provided on the sliding seat 9 so as to drive the sliding seat 9 to slide on the frame 2 through the handle 18 .

[0061] like Figure 1 , 2 As shown, the frame 2 may be provided with at least two guide rails 19;

[0062] The sliding seat 9 is provided with a pulley group corresponding to the guide rail 19 one by one;

[0063] The pulley block includes at least two pulleys 20 slidably connected to the corresponding guide rails 19 , so that the sliding seat 9 is slidably connected to the frame 2 ; specifically, two guide rails 19 are provided, and each pulley block includes two pulleys 20 .

[0064] like Figure 1 As shown, in this embodiment, two bag-stretching devices 100 may be provided, and the two bag-stretching devices 100 share one sealing and cutting station. When one of the bag-stretching devices 100 is located at the sealing and cutting station, the flat bag 1 may be placed on the other bag-stretching device 100. The two bag-stretching devices 100 work together to further improve the production efficiency of the square bottom bag.

[0065] like Figure 1 , 3 As shown, the sealing and cutting device 200 may include a sealing and cutting mechanism corresponding to the bottom corners 4 one by one, and the sealing and cutting mechanism may be, for example but not limited to, the following structure, which includes a fixed seat 21, a movable seat 22, a driving cylinder 23, a fusible wire 24 and a heat sealing wire 25; wherein,

[0066] The fixing seat 21 is connected to the frame 2;

[0067] The movable seat 22 is slidably connected to the frame 2, and the sealing gap 6 is formed between the fixed seat 21 and the sliding seat 9;

[0068] The fusible wire 24 is connected to any one of the fixed seat 21 and the movable seat 22 and is located in the sealing gap 6;

[0069] The heat sealing wire 25 is connected to any one of the fixed seat 21 and the movable seat 22 and is located in the sealing gap 6;

[0070] In the direction of the line connecting the two bottom corners 4, the heat sealing wire 25 is closer to the bag bottom 3 than the melting wire 24;

[0071] The cylinder body of the driving cylinder 23 is connected to the frame 2, and the piston rod of the driving cylinder 23 is connected to the movable seat 22, so that the driving cylinder 23 drives the movable seat 22 to move toward the fixed seat 21 and press the connecting edge 5 of the bottom corner 4 onto the fusible wire 24 and the heat-sealing wire 25, so that the fusible wire 24 melts the connecting edge 5, and the heat-sealing wire 25 heat-seals the connecting edge 5, thereby cutting off the bottom corner 4; in this embodiment, the fusible wire 24 and the heat-sealing wire 25 are both connected to the fixed seat 21, and the lower end of the movable seat 22 is provided with heat-resistant rubber.

[0072] like Figures 1 to 3 As shown, the square bottom bag making machine may further include a travel switch 26 and a control circuit board; wherein,

[0073] The travel switch 26 is arranged on the frame 2 and is used to abut against the bag-supporting device 100 moved to the sealing and cutting station to be triggered;

[0074] The input end of the control circuit board is connected to the travel switch 26, and the control circuit board is controlled and connected to the driving cylinder 23, the fusible wire 24 and the heat-sealing wire 25, so that when the travel switch 26 is triggered, the control circuit board controls the fusible wire 24 and the heat-sealing wire 25 to be energized and controls the driving cylinder 23 to move; specifically, the sliding seat 9 is provided with an abutment block 31 for abutting against the travel switch 26 to trigger the travel switch 26, and the two bag-holding devices 100 share one travel switch 26.

[0075] In this embodiment, the fusible wire 24 may be a heating wire with a circular cross-section, and the heat-sealing wire 25 may be a heating wire with a flat structure.

[0076] The working principle of the present invention is as follows:

[0077] The flat bag 1 is sleeved on the upper end of the first bag-stretching component 10 and the upper end of the second bag-stretching component 11, so that the front bag surface 7 is abutted against the first bag-stretching component 10, and the rear bag surface 8 is abutted against the second bag-stretching component 11; then the bag-stretching driving mechanism drives the upper end of the first bag-stretching component 10 and the upper end of the second bag-stretching component 11 to move in opposite directions to open the front bag surface 7 and the rear bag surface 8, thereby forming the bag bottom 3 and the two bottom corners 4; then the bag-stretching device 100 is pushed to slide to the sealing and cutting station, so that the bottom corner 4 moves to the corresponding sealing gap 6; then the driving cylinder 23 drives the movable seat 22 to press the connecting edge 5 of the bottom corner 4 onto the fusible wire 24 and the heat-sealing wire 25, so that the fusible wire 24 melts the connecting edge 5, and the heat-sealing wire 25 heat-seals the connecting edge 5. The whole operation is extremely simple, which simplifies the production process of the square bottom bag, thereby reducing the production cost of the square bottom bag and increasing the output of the square bottom bag. Moreover, the square bottom bag making machine of the present invention is small in size, occupies a small space, has a simple structure and is low in cost. In addition, the bag-supporting device 100 is provided with two. When one of the bag-supporting devices 100 is located at the sealing and cutting station, the flat bag 1 can be placed on the other bag-supporting device 100. The cooperation of the two bag-supporting devices 100 further improves the production efficiency of the square bottom bag.

[0078] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0079] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0082] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A square bottom bag making machine, which is used to process a flat bag (1) into a square bottom bag, characterized in that: It comprises a frame (2), a bag-supporting device (100) and a sealing and cutting device (200); wherein: The bag-holding device (100) is slidably connected to the frame (2), and has a bag-holding station and a sealing and cutting station during the sliding process. When the bag-holding device (100) is located at the bag-holding station, the bag-holding device (100) is used to sleeve the flat bag (1) and to move to open the flat bag (1) sleeved on the bag-holding device (100) to form a bag bottom (3) and two bottom corners (4), wherein the edges of the bottom corners (4) connected to the bag bottom (3) are connecting edges (5); when the bag-holding device (100) moves to the sealing and cutting station, the bag-holding device (100) drives the bottom corners (4) on the opened flat bag (1) to move to the sealing gaps (6) in the sealing and cutting device (200) corresponding to the bottom corners (4); The sealing and cutting device (200) is arranged on the frame (2) and is provided with sealing gaps (6) corresponding to the bottom corners (4) one by one. The sealing and cutting device (200) is used to move to at least clamp the connecting edge (5) of the bottom corner (4) in the sealing gap (6), and cut off and heat-seal the connecting edge (5); The flat bag (1) comprises a front bag surface (7) and a rear bag surface (8); the bag-holding device (100) comprises a sliding seat (9), a first bag-holding component (10), a second bag-holding component (11) and a bag-holding driving mechanism; wherein: The sliding seat (9) is slidably connected to the frame (2); The lower end of the first bag-supporting component (10) and the lower end of the second bag-supporting component (11) are both rotatably connected to the sliding seat (9); The flat bag (1) is used to be sleeved on the upper end of the first bag-supporting component (10) and the upper end of the second bag-supporting component (11), so that the front bag surface (7) abuts against the first bag-supporting component (10), and the rear bag surface (8) abuts against the second bag-supporting component (11); The bag-holding driving mechanism is arranged on the sliding seat (9) and is connected to the first bag-holding component (10) and the second bag-holding component (11), so that the bag-holding driving mechanism drives the first bag-holding component (10) and the second bag-holding component (11) to rotate, thereby causing the upper end of the first bag-holding component (10) and the upper end of the second bag-holding component (11) to move in opposite directions to open the front bag surface (7) and the rear bag surface (8); The bag-supporting driving mechanism comprises: a bag-supporting cylinder (12), wherein a cylinder body of the bag-supporting cylinder (12) is connected to the sliding seat (9); A driving seat (13), the driving seat (13) being connected to the piston rod of the bag-supporting cylinder (12); at least one first driving rod (14), one end of the first driving rod (14) being hinged to the driving seat (13), and the other end of the first driving rod (14) being hinged to the upper end of the first bag-supporting component (10); at least one second driving rod (15), one end of the second driving rod (15) being hinged on the driving seat (13), and the other end of the second driving rod (15) being hinged on the upper end of the second bag-supporting component (11), so that the bag-supporting cylinder (12) drives the driving seat (13) to rise and fall, thereby driving the upper end of the first bag-supporting component (10) and the upper end of the second bag-supporting component (11) to move away from or towards each other; The first driving rod (14) and the second driving rod (15) are each provided with two, the first bag-supporting component (10) comprises a first supporting rod portion (16) corresponding one-to-one to the first driving rod (14), and the second bag-supporting component (11) comprises a second supporting rod portion (17) corresponding one-to-one to the second driving rod (15); wherein: The lower end of the first support rod portion (16) and the lower end of the second support rod portion (17) are both rotatably connected to the sliding seat (9); One end of the first driving rod (14) is hinged on the driving seat (13), and the other end of the first driving rod (14) is hinged on the upper end of the corresponding first support rod portion (16); One end of the second driving rod (15) is hinged on the driving seat (13), and the other end of the second driving rod (15) is hinged on the upper end of the corresponding second support rod portion (17); The sealing and cutting device (200) comprises a sealing and cutting mechanism corresponding to the bottom corners (4) one by one, the sealing and cutting mechanism comprising a fixed seat (21), a movable seat (22), a driving cylinder (23), a fusible cutting wire (24) and a heat sealing wire (25); wherein: The fixing seat (21) is connected to the frame (2); The movable seat (22) is slidably connected to the frame (2), and the sealing gap (6) is formed between the fixed seat (21) and the sliding seat (9); The fusible wire (24) is connected to any one of the fixed seat (21) and the movable seat (22) and is located in the sealing gap (6); The heat sealing wire (25) is connected to any one of the fixed seat (21) and the movable seat (22) and is located in the sealing gap (6); In the direction of the line connecting the two bottom corners (4), the heat sealing wire (25) is closer to the bag bottom (3) than the melting wire (24); The cylinder body of the driving cylinder (23) is connected to the frame (2), and the piston rod of the driving cylinder (23) is connected to the movable seat (22), so that the driving cylinder (23) drives the movable seat (22) to move toward the fixed seat (21) and press the connecting edge (5) of the bottom corner (4) onto the fusible wire (24) and the heat-sealing wire (25), so that the fusible wire (24) melts the connecting edge (5), and the heat-sealing wire (25) heat-seals the connecting edge (5).

2. The square bottom bag making machine according to claim 1, characterized in that: The sliding seat (9) is provided with a handle (18).

3. The square bottom bag making machine according to claim 1, characterized in that: The frame (2) is provided with at least two guide rails (19); The sliding seat (9) is provided with a pulley block corresponding one-to-one to the guide rail (19); The pulley block comprises at least two pulleys (20) slidably connected to corresponding guide rails (19).

4. The square bottom bag making machine according to claim 1, characterized in that: Two bag-holding devices (100) are provided, and the two bag-holding devices (100) share one sealing and cutting station.

5. The square bottom bag making machine according to claim 1, characterized in that: It also includes a travel switch (26) and a control circuit board; wherein, The travel switch (26) is arranged on the frame (2) and is used to abut against the bag-supporting device (100) moved to the sealing and cutting station to be triggered; The input end of the control circuit board is connected to the travel switch (26), and the control circuit board is control-connected to the driving cylinder (23), the fusible wire (24) and the heat-sealing wire (25), so that when the travel switch (26) is triggered, the control circuit board controls the fusible wire (24) and the heat-sealing wire (25) to be energized and controls the driving cylinder (23) to actuate.

6. The square bottom bag making machine according to claim 1, characterized in that: The fusible wire (24) is an electric heating wire with a circular cross-section, and the heat sealing wire (25) is an electric heating wire with a flat structure.

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