A heat-sealing mechanism for a bag-making machine

Abstract

A heat-sealing mechanism for a bag-making machine disclosed by the present invention includes a frame. A first clamping plate and a second clamping plate are arranged on the frame. A first mounting plate and a second mounting plate are arranged on the frame. A driving plate is arranged at the outer end of the guiding rod. A vertical plate is arranged between the driving plate and the first mounting plate. A first connecting rod and a second connecting rod are hingedly arranged on the vertical plate. The first connecting rod is hingedly arranged on the driving plate. The second connecting rod is hingedly arranged on the first mounting plate. A first driving device for driving the vertical plate to move up and down is arranged on the frame. In the present invention, the up-and-down movement of the vertical plate drives the first mounting plate and the second mounting plate to move synchronously and towards each other, so that the first clamping plate and the second clamping plate keep moving synchronously and towards each other, ensuring the stability of the sealing position of the packaging bag. Moreover, the first connecting rod and the second connecting rod change the pressure of the vertical plate to drive the first mounting plate and the second mounting plate to clamp each other, improving the clamping force, reducing the burden on the driving device, and improving the sealing quality of the packaging bag.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag sealing, and particularly to a heat sealing mechanism of a bag making machine. Background Art

[0002] In daily life, packaging bags are commonly used containers for filling various materials. A common packaging bag is formed by folding a plastic film and then thermally bonding the folded part of the packaging bag through a heat sealing mechanism to form a bag bottom. During heat sealing, the plastic film needs to move along the original path, and two clamping plates of the heat sealing mechanism need to move to the position of the plastic film simultaneously. The heating blocks on the clamping plates perform heat sealing and bonding on the folded part of the plastic film. Currently, the heat sealing mechanism drives two clamping plates to reciprocate in opposite directions through two independent motors or oil cylinders. The heat sealing accuracy is not easy to control. If there is a deviation in the movement of the two clamping plates, it is easy to cause the plastic film to shift during heat sealing, and the heat sealing position of the plastic film will also change accordingly, affecting the stability of the packaging bag heat sealing. Moreover, two independent driving devices drive two clamping plates to clamp the plastic film, requiring a relatively large clamping force, which brings a great burden to the driving mechanism. Insufficient clamping force also affects the quality of the formed packaging bag. Therefore, a heat sealing mechanism that can further improve the quality of packaging bags is needed. Summary of the Invention

[0003] The purpose of the present invention is to avoid the deficiencies of the prior art and provide a heat sealing mechanism of a bag making machine, thereby effectively solving the deficiencies existing in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a heat sealing mechanism of a bag making machine, including a frame. A through - hole for the plastic film to pass through is provided on the frame. A first clamping plate and a second clamping plate are respectively arranged on both sides of the through - hole. A first mounting plate and a second mounting plate are respectively arranged on the frame in cooperation with the first clamping plate and the second clamping plate. The second mounting plate is movably arranged on the frame through a guide rod. The first mounting plate is movably arranged on the guide rod. A guide seat is arranged on the frame in cooperation with the guide rod. A driving plate is arranged at the outer end of the guide rod. A vertical plate is arranged between the driving plate and the first mounting plate. A first connecting rod and a second connecting rod are respectively hinged on the vertical plate in cooperation with the driving plate and the first mounting plate. The first connecting rod is hinged on the driving plate, and the second connecting rod is hinged on the first mounting plate. A first driving device for driving the vertical plate to move up and down is arranged on the frame.

[0005] Further, the included angle between the first connecting rod and the second connecting rod is greater than 90°.

[0006] Further, a reversing rod is hinged on the frame. A rotating shaft is arranged on the vertical plate. A long hole is provided on the right side of the reversing rod in cooperation with the rotating shaft. The first driving device drives the vertical plate to move up and down by driving the left side of the reversing rod to swing.

[0007] Furthermore, the first driving device is a servo motor. A runner is provided at the output end of the first driving device. A third connecting rod is eccentrically hinged to the runner, and the upper end of the third connecting rod is hinged to the left side of the reversing rod.

[0008] Furthermore, the third connecting rod includes a bottom rod and a cylinder rod that form a piston shape with each other. A compression spring is provided between the bottom of the cylinder rod and the bottom rod.

[0009] Furthermore, the first connecting rod and the second connecting rod are both provided in two places on the vertical plate, and a guide rod is provided on both the upper and lower sides of the first mounting plate.

[0010] Furthermore, the first clamping plate and the second clamping plate are respectively installed on the first mounting plate and the second mounting plate through a first mounting seat and a second mounting seat. First adjustment grooves and second adjustment grooves are respectively formed on the first mounting seat and the second mounting seat in cooperation with the first mounting plate and the second mounting plate.

[0011] Furthermore, an adjustment screw rod is provided at the rear side of the second mounting plate. The rear side of the second mounting seat is screwed onto the adjustment screw rod, and an adjustment groove is formed on the frame at the upper end of the adjustment screw rod.

[0012] Furthermore, a positioning plate is rotatably provided horizontally on the first clamping plate, and a magnet capable of attracting the positioning plate is provided at the rear side of the positioning plate.

[0013] Furthermore, a guide rail is provided at the bottom of the frame, and a second driving device for driving the frame to move along the guide rail is provided on the frame.

[0014] The above technical solution of the present invention has the following beneficial effects: When the vertical plate of the present invention moves up and down, the first connecting rod and the second connecting rod can drive the first mounting plate and the second mounting plate to move synchronously and towards each other, so that the first clamping plate and the second clamping plate keep moving synchronously and towards each other. The accuracy is higher than that of the independent movement of the two clamping plates. The position during bag clamping is accurate, ensuring the stability of the sealing position of the packaging bag. Moreover, the first connecting rod and the second connecting rod reverse the pressure of the vertical plate to drive the first mounting plate and the second mounting plate to clamp each other, improving the clamping force, reducing the burden on the driving device, and improving the sealing quality of the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of an embodiment of the present invention;

[0016] Figure 2 is a perspective view of the interior of an embodiment of the present invention;

[0017] Figure 3 is a schematic plan view of the interior of an embodiment of the present invention;

[0018] Figure 4 is Figure 3 an enlarged view of part A in

[0019] Figure 5 This is an exploded view of the cooperation between the second clamping plate and the second mounting seat in the embodiment of the present invention;

[0020] Figure 6 This is a schematic cross-sectional view of the cooperation between the bottom rod and the cylinder rod in the embodiment of the present invention. Detailed implementation manners

[0021] The following further describes the implementation manners of the present invention in detail with reference to the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus cannot be understood as a limitation to the present invention.

[0023] As Figures 1-6 shown, a heat-sealing mechanism of a bag-making machine described in this embodiment includes a frame 1. A through hole for a plastic film to pass through is provided on the frame 1. A first clamping plate 2 and a second clamping plate 3 are respectively provided on both sides of the through hole. Heating blocks are provided on both the first clamping plate 2 and the second clamping plate 3. A first mounting plate 21 and a second mounting plate 31 are respectively provided on the frame 1 to cooperate with the first clamping plate 2 and the second clamping plate 3. The second mounting plate 31 is movably provided on the frame 1 through a guide rod. The first mounting plate 21 is movably provided on the guide rod 4. A guide seat 11 is provided on the frame 1 to cooperate with the guide rod 4. A driving plate 41 is provided at the outer end of the guide rod 4. A vertical plate 5 is provided between the driving plate 41 and the first mounting plate 21. A first connecting rod 51 and a second connecting rod 52 are respectively hingedly provided on the vertical plate 5 to cooperate with the driving plate 41 and the first mounting plate 21. The first connecting rod 51 is hingedly provided on the driving plate 41, and the second connecting rod 52 is hingedly provided on the first mounting plate 21. A first driving device 53 for driving the vertical plate 5 to move up and down is provided on the frame 1; preferably, the included angle between the first connecting rod 51 and the second connecting rod 52 is greater than 90°;

[0024] The plastic film is intermittently conveyed at the through-port of the frame 1. The first clamping plate 2 and the second clamping plate 3 reciprocate towards each other, enabling the two heating blocks to perform intermittent sealing actions on the plastic film. The first driving device 53 drives the vertical plate 5 to move up and down. The vertical plate 5 can drive the inner ends of the first connecting rod 51 and the second connecting rod 52 to move up and down. Since the guide seat 11 restricts the first mounting plate 21, the second mounting plate 31, and the driving plate 41 to only move along the axial direction of the guide rod 4, the outer ends of the first connecting rod 51 and the second connecting rod 52 cannot move up and down. The first connecting rod 51 and the second connecting rod 52 swing. The first connecting rod 51 and the second connecting rod 52 respectively push the driving plate 41 and the first mounting plate 21 outwards. Among them, the driving plate 41, the guide rod 4, and the second mounting plate 31 move to the left, and the first mounting plate 21 synchronously moves to the right on the guide rod 4, that is, the first mounting plate 21 and the second mounting plate 31 move towards each other, and the first clamping plate 2 and the second clamping plate 3 can clamp and seal the plastic film; the first connecting rod 51 and the second connecting rod 52 change the downward movement of the vertical plate 5 into the reverse movement of the driving plate 41 and the first mounting plate 21, that is, the first mounting plate 21 and the second mounting plate 31 move towards each other. Among them, the included angle between the first connecting rod 51 and the second connecting rod 52 is greater than 90°, and the included angle between the first connecting rod 51 and the second connecting plate 52 is an obtuse angle, making it more labor-saving for the vertical plate 5 to drive the movement of the driving plate 41 and the first mounting plate 21 through the first connecting plate 51 and the second connecting plate 52;

[0025] Preferably, a reversing rod 6 is hinged on the frame 1. A rotating shaft 54 is arranged on the vertical plate 5. A long hole 61 is provided on the right side of the reversing rod 6 to cooperate with the rotating shaft 54. The first driving device 53 drives the left side of the reversing rod 6 to swing to drive the vertical plate 5 to move up and down; the first driving device 53 drives the reversing rod 6 to swing, and the right side of the reversing rod 6 drives the rotating shaft 54 to move up and down through the long hole 61, and then the vertical plate 5 can be driven to move up and down; in this embodiment, the rotating shaft 54 is arranged on the upper side of the vertical plate 5, the reversing rod 6 is arranged on the left side of the rotating shaft 54, and the first driving device 53 can be arranged on the lower side of the reversing rod 6, which can reduce the height of the whole mechanism in the vertical direction, making it convenient for installation and avoiding affecting the stability;

[0026] Preferably, the first driving device 53 is a servo motor. A runner 55 is arranged at the output end of the first driving device 53. A third connecting rod 7 is eccentrically hinged on the runner 55. The upper end of the third connecting rod 7 is hinged on the left side of the reversing rod 6; in this embodiment, the upper end of the third connecting rod 7 is ball-hinged on the left end of the reversing rod 6. The servo motor drives the runner 55 to swing, and the runner 55 drives the bottom of the third connecting rod 7 to swing up and down, thereby driving the reversing rod 6 to swing;

[0027] Preferably, the third link 7 includes a bottom rod 71 and a cylinder rod 72 that form a piston shape with each other. A compression spring 73 is provided between the bottom of the cylinder rod 72 and the bottom rod 71. In this embodiment, when the bottom rod 71 moves upward, it will drive the cylinder rod 72 to move upward through the compression spring 73, and then drive the vertical plate 5 to move downward through the reversing rod 6. The vertical plate 5 drives the driving plate 41 and the first mounting plate 21 to move away from each other through the first link 51 and the second link 52. The first mounting plate 21 and the second mounting plate 31 move toward each other, that is, the first clamping plate 2 and the second clamping plate 3 move toward each other to clamp the plastic film. When the first clamping plate 2 and the second clamping plate 3 are clamped, the bottom rod 71 and the cylinder rod 72 can be buffered by the compression spring 73 to avoid excessive upward movement of the bottom rod 71 and cause equipment damage. At the same time, the clamping effect of the first clamping plate 2 and the second clamping plate 3 can also be ensured;

[0028] Preferably, the first link 51 and the second link 52 are both provided in two places on the vertical plate 5, and a guide rod 4 is provided on both the upper and lower sides of the first mounting plate 21 to ensure the smooth movement of the first mounting plate 21, the driving plate 41 and the second mounting plate 31;

[0029] Preferably, the first clamping plate 2 and the second clamping plate 3 are respectively installed on the first mounting plate 21 and the second mounting plate 31 through the first mounting seat 22 and the second mounting seat 32. The first mounting seat 22 and the second mounting seat 32 are respectively provided with a first adjustment groove 23 and a second adjustment groove 33 in cooperation with the first mounting plate 21 and the second mounting plate 31. When the depths of the packaging bags to be processed are different, the heights of the plastic films are also different. Therefore, the heights of the first clamping plate 2 and the second clamping plate 3 can be adjusted to adapt to plastic films of different heights for sealing; among them, the first clamping plate 2 and the first mounting seat 22 are fastened by bolts, and the second clamping plate 3 and the second mounting seat 32 are also fastened by bolts; the first mounting seat 22 and the second mounting seat 32 can be adjusted up and down in the first adjustment groove 23 and the second adjustment groove 33, and fastening the first clamping plate 2 and the second clamping plate 3 at different positions realizes the height adjustment of the first clamping plate 2 and the second clamping plate 3;

[0030] Preferably, an adjustment screw 34 is provided on the rear side of the second mounting plate 31, and the rear side of the second mounting seat 32 is screwed on the adjustment screw 34. The second mounting seat 32, the second adjustment groove 33 and the adjustment screw 34 form a lead screw structure. An adjustment groove 14 is opened on the upper end of the adjustment screw 34 on the frame 1. A plum blossom hole can be provided at the upper end of the adjustment screw 34. Before the equipment runs, the worker can rotate the adjustment screw 34 through the plum blossom hole at the adjustment groove 14 with a wrench, so that the second mounting seat 32 can move up and down in the second adjustment groove 33. After determining the position of the second mounting seat 32, when the connection between the first clamping plate 2 and the first mounting seat 22 is loosened, it can be manually adjusted to be flush with the second clamping plate 3 to determine the position of the first clamping plate 2;

[0031] Preferably, a positioning plate 24 is rotatably arranged horizontally on the first clamping plate 2, and a magnet 25 for sucking the positioning plate 24 is arranged at the rear side of the positioning plate 24. When adjusting the height of the first clamping plate 2, the positioning plate 24 can be rotated out. When the positioning plate 24 is placed on the second clamping plate 3, that is, when the first clamping plate 2 is flush with the second clamping plate 3, after the first clamping plate 2 and the first mounting seat 22 are fastened, the positioning plate 24 can be rotated inwards and fixed by the magnet 25 to prevent the positioning plate 24 from rotating out when the first clamping plate 2 moves horizontally.

[0032] Preferably, a guide rail 12 is arranged at the bottom of the frame 1, and a second driving device 13 for driving the frame 1 to move along the guide rail 12 is arranged on the frame 1. The frame 1 can be arranged on the base of the packaging bag conveying device, and a rack (not shown in the figure) can be arranged on the base. The second driving device 13 is a servo motor, and a gear is arranged on the output shaft of the servo motor to cooperate with the rack. By driving the gear to rotate, the position of the frame 1 on the base can be adjusted to adapt to the sealing requirements of packaging bags with different widths and adjust the position of the frame 1.

[0033] The working process of this embodiment is as follows: The plastic film is intermittently conveyed at the through port. The servo motor drives the runner 55 to swing, driving the telescopic movement of the bottom rod 71 and the barrel rod 72. The reversing rod 6 swings accordingly, driving the vertical plate 5 to move downward. The first connecting rod 51 and the second connecting rod 52 on the vertical plate 5 drive the driving plate 41 and the first mounting plate 21 to move away from each other respectively. The driving plate 41 drives the second mounting plate 31 to move leftward through the guide rod 4, that is, the first mounting plate 21 and the second mounting plate 31 move towards each other, causing the first clamping plate 2 and the second clamping plate 3 to move towards each other, so that the two heating blocks perform a sealing action on the plastic film. After sealing, the servo motor drives the runner 55 to swing in the reverse direction, driving the bottom rod 71 and the barrel rod 72 to retract. The reversing rod 6 swings in the reverse direction, driving the vertical plate 5 to move upward. The first connecting rod 51 and the second connecting rod 52 on the vertical plate 5 drive the driving plate 41 and the first mounting plate 21 to move towards each other respectively. The driving plate 41 drives the second mounting plate 31 to move rightward through the guide rod 4, that is, the first mounting plate 21 and the second mounting plate 31 move away from each other, causing the first clamping plate 2 and the second clamping plate 3 to move away from each other and open, and the plastic film continues to be conveyed to prepare for the sealing action of the next part.

[0034] The embodiments of the present invention are given for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A heat-sealing mechanism for a bag-making machine, characterized in that: It includes a frame, on which there is a through-hole for a plastic film to pass through. On both sides of the through-hole, there are respectively a first clamping plate and a second clamping plate. On the frame, there are respectively a first mounting plate and a second mounting plate that cooperate with the first clamping plate and the second clamping plate. The second mounting plate is movably arranged on the frame through a guide rod, and the first mounting plate is movably arranged on the guide rod. On the frame, there is a guide seat that cooperates with the guide rod. The outer end of the guide rod is provided with a driving plate. Between the driving plate and the first mounting plate, there is a vertical plate. On the vertical plate, there are respectively a first connecting rod and a second connecting rod that are hinged with the driving plate and the first mounting plate. The first connecting rod is hinged on the driving plate, and the second connecting rod is hinged on the first mounting plate. On the frame, there is a first driving device for driving the vertical plate to move up and down. On the frame, there is a reversing rod that is hinged. On the vertical plate, there is a rotating shaft. On the right side of the reversing rod, there is a long hole that cooperates with the rotating shaft. The first driving device drives the vertical plate to move up and down by driving the left side of the reversing rod to swing. The first driving device is a servo motor. The output end of the first driving device is provided with a runner. On the runner, there is an eccentrically hinged third connecting rod. The upper end of the third connecting rod is hinged on the left side of the reversing rod. The third connecting rod includes a bottom rod and a barrel rod that form a piston shape with each other. Between the bottom of the barrel rod and the bottom rod, there is a compression spring. The first clamping plate and the second clamping plate are respectively installed on the first mounting plate and the second mounting plate through a first mounting seat and a second mounting seat. On the first mounting seat and the second mounting seat, there are respectively a first adjustment slot and a second adjustment slot that cooperate with the first mounting plate and the second mounting plate. At the rear side of the second mounting plate, there is an adjustment screw. The rear side of the second mounting seat is screwed on the adjustment screw. On the frame, there is an adjustment slot at the upper end of the adjustment screw. At the bottom of the frame, there is a guide rail. On the frame, there is a second driving device for driving the frame to move along the guide rail.

2. The heat-sealing mechanism of a bag-making machine according to claim 1, wherein: The included angle between the first connecting rod and the second connecting rod is greater than 90°.

3. The heat-sealing mechanism of a bag-making machine according to claim 1, characterized in that: There are two places where the first connecting rod and the second connecting rod are arranged on the vertical plate, and there is one guide rod on both the upper and lower sides of the first mounting plate.

4. The heat-sealing mechanism of a bag-making machine according to claim 1, characterized in that: On the first clamping plate, there is a positioning plate that can rotate horizontally. At the rear side of the positioning plate, there is a magnet that can suck the positioning plate.

Images