WO2014044229A1

WO2014044229A1 - Heat-sealing device for packaging bags

Info

Publication number: WO2014044229A1
Application number: PCT/CN2013/085581
Authority: WO
Inventors: 熊怒怀; 康峰; 苏九洲; 郑春龙; 贺建军
Original assignee: 楚天科技股份有限公司
Priority date: 2012-09-21
Filing date: 2013-10-21
Publication date: 2014-03-27

Abstract

Disclosed is a heat-sealing device for packing bags, comprises a heat-sealing assembly (6), a support frame (1), and an opening-and-closing assembly installed on the support frame (1) for controlling the opening and closing of the opening of a packaging bag (9). The opening-and-closing assembly comprises two clamping-and-holding mechanisms (2) disposed at either end of the packaging bag (9), and a first connection element (3) and a second connection element (4) that can move relatively and are disposed at either side of the packaging bag (9). Each clamping-and-holding mechanism (2) is connected with a connecting rod assembly. Each connecting rod assembly comprises a first connecting rod (81) and a second connecting rod (82). The two ends of the first connecting rod (81) are hingedly connected to respectively the clamping-and-holding mechanism (2) and the first connecting element (3). The two ends of the second connecting rod (82) are hingedly connected to respectively the clamping-and-holding mechanism (2) and the second connecting element (4). The present device has a simple structure, operates stably, and can enhance heat sealing quality.

Description

Packaging bag heat sealing device

[Technical Field]

The invention mainly relates to the field of packaging machinery, and particularly relates to a heat sealing device for a packaging bag.

【Background technique】

In the field of packaging machinery, the package heat sealing device is used to heat seal the package after charging. The existing packaging bag uses a heat sealing device, the transmission structure is complicated, the support is unstable, and the heat sealing operation is easily adversely affected. The clamping mechanism is in the shape of a scissors, which is opened to the both sides with the bracket as the center, and is closed during the heat sealing process. This structure causes the heating time of each section of the heat sealing line of the packaging bag to be different. The side close to the rotating center has a long heating time, and the distal end has a short heating time. If the control is improper, the proximal end is blown or the distal end is not heat-sealed. This structure also results in uneven distribution of heat build-up, which can also result in partial blown and partially unsealed bags. In addition, the heat sealing seal of the existing packaging bag is prone to partial unheating and partial melting when the package is heat sealed, resulting in failure of the heat sealing package, affecting packaging efficiency and yield. The reason for the partial unheating phenomenon is: The bag itself is more flexible, and it is easy to produce wrinkles when subjected to tension, and these wrinkles are liable to cause insufficient heat sealing, thereby causing partial unheating; the reason for partial fusing is : During the heat-melting process of the packaging bag, the tensile strength of the packaging bag is greatly reduced. At this time, the packaging bag is affected by the gravity pulling of the material, which may easily cause the packaging bag to be partially melted.

[Summary of the Invention]

The technical problem to be solved by the present invention is that, in view of the deficiencies of the prior art, a heat sealing device for a packaging bag which has a simple structure, a stable operation, and can effectively improve the heat sealing quality is provided.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A package heat sealing device comprises a heat sealing component, a support frame and an opening and closing assembly mounted on the support frame for controlling the opening and closing of the bag opening, the opening and closing assembly comprising the two ends of the packaging bag Two clamping mechanisms, and first and second connecting members respectively disposed on opposite sides of the packaging bag, each of the clamping mechanisms is connected with a connecting rod set, the connecting rod set a first link and a second link are included, and two ends of the first link are respectively hinged with the clamping mechanism and the first connecting member, and two ends of the second connecting rod are respectively connected with the clamping mechanism and the second connecting Articulated.

As a further improvement of the above technical solution:

The second connecting member is disposed on a push driving member.

The first connecting member is fixed on the support frame, the support frame comprises two support arms, each of the support arms is provided with a set of flat push drive members, and the flat push drive member comprises a rodless cylinder and a slider , the rodless cylinder of each set of flat push drive members The driving ends are respectively connected to both ends of the second connecting member through the slider.

The connecting rod set further includes a limiting rod, the two ends of the limiting rod are respectively hinged with the clamping mechanism and the first connecting member, and the hinge center of the limiting rod on the clamping mechanism is clamped with the first connecting rod The hinge center of the holding mechanism is different. In the same link group, the connecting lines of the two hinge centers of the limiting rod are parallel and equal in length to the connecting lines of the two hinge centers of the first link.

The hinge center of the limiting rod and the first link on the same clamping mechanism is disposed along a relative moving direction of the first connecting member and the second connecting member.

The first link and the second link each include a fixed section and a telescopic section, and the telescopic section is coupled to the fixed section and is axially movable along the fixed section.

One end of the fixing section is provided with an internally threaded hole in the axial direction, and the telescopic section is provided with an external thread that is coupled with the internally threaded hole.

The front end of the internally threaded hole is provided with a section of a circular hole, and the telescopic section is provided with a shoulder portion that cooperates with the circular hole.

A fastening screw hole communicating with the circular hole is defined in the outer wall of the fixing portion, and a fastening screw is screwed into the fastening screw hole, and the fastening screw is press-fitted with the shoulder portion.

The heat sealing component is a heat sealing head, and the heat sealing head is mounted on the first connecting member and/or the second connecting member.

The first connecting member and the second connecting member are each provided with a vacuum chuck.

There are two or more vacuum chucks on the first connector and the second connector.

The vacuum chuck is a spring-loaded vacuum chuck.

The support frame, the clamping mechanism, the first connecting member and the second connecting member are respectively provided with a built-in air passage, and the built-in air passage on the supporting frame is respectively connected to the clamping mechanism, the first connecting member and the plurality of air pipes The built-in air passage on the second connector is in communication.

Each clamping mechanism is provided with upper and lower clamping positions for clamping the packaging bag, and the heat sealing assembly heat-closes the packaging bag portion between the upper and lower clamping positions in the vertical direction during heat sealing. .

All of the clamping positions of a pair of the clamping mechanisms are in the same plane.

The clamping mechanism is provided with clamping cylinders at each clamping position, and the driving end of the clamping cylinder is provided with a clamping head. Compared with the prior art, the invention has the advantages that: the package heat sealing device of the invention can realize the opening and closing of the bag opening by the switching between the open state and the closed state of the opening and closing assembly, and the heat sealing component is assembled. When the opening and closing assembly is disposed, the heat sealing operation can be realized, which can greatly simplify the overall structure of the heat sealing sealing device; the first connecting member is separated from the second connecting member when the opening and closing assembly is opened, and the first connecting member and the second connecting member are separated It is roughly hexagonal in shape with the four-piece connecting rod. This structure moves smoothly and can be quickly stabilized after stopping the movement. It does not cause vibration of the clamping mechanism, the heat sealing assembly and the packaging bag, and can effectively improve the heat sealing quality. .

[Description of the Drawings]

Figure 1 is a schematic front view of the structure of the present invention. 2 is a schematic top plan view of the present invention when the opening and closing assembly is closed.

FIG. 3 is a schematic top plan view of the present invention when the opening and closing assembly is opened.

Figure 4 is a schematic enlarged view of a portion A in Figure 3.

FIG. 5 is a schematic top plan view showing another structural form of the present invention when the opening and closing assembly is opened. Legend: 1, support frame; 11, support arm; 12, air pipe; 2, clamping mechanism; 21, clamping cylinder; 22, clamping head; 23, clamping position; 3, first connecting piece; , second connecting member; 6, heat sealing assembly; 7, flat push drive member; 71, rodless cylinder; 72, slider; 81, first link; 82, second link; 83, limit rod; 842, telescopic section; 843, female threaded hole; 844, external thread; 845, round hole; 846, shoulder; 847, fastening screw hole; 848, fastening screw; 9, packaging bag; , vacuum suction cups.

【detailed description】

The invention will be further described in detail below with reference to the drawings and specific embodiments.

1 to 3 show an embodiment of a package heat sealing device according to the present invention, which comprises a heat sealing assembly 6, a support frame 1 and a mounting on the support frame 1 for controlling the opening and closing of the bag opening and closing of the bag 9 Component. Referring to Figures 2 and 3, the opening and closing assembly includes two clamping mechanisms 2, which are respectively disposed at two ends of the packaging bag 9, and a first connecting member 3 and a second connecting member 4 which are respectively disposed on opposite sides of the packaging bag 9. Each of the clamping mechanisms 2 is connected to a link set, and the link set includes a first link 81 and a second link 82. The two ends of the first link 81 are respectively connected to the clamping mechanism 2 and the first connecting member 3 Hinged, the two ends of the second link 82 are hinged to the clamping mechanism 2 and the second connecting member 4, respectively. The opening and closing of the bag opening can be realized by the switching between the open state and the closed state of the opening and closing assembly, and the heat sealing operation can be realized when the heat sealing component 6 is mounted on the opening and closing component, which can greatly simplify the heat sealing device. The first connecting member 3 is separated from the second connecting member 4 in the open state of the opening and closing assembly, and the first connecting member 3, the second connecting member 4 and the four connecting members are substantially formed into a hexagonal shape. The structure movement is stable, and it can be quickly stabilized after stopping the movement, and does not cause the vibration of the clamping mechanism 2, the heat sealing assembly 6 and the packaging bag 9, and the heat sealing quality can be effectively improved.

In this embodiment, the second connecting member 4 is disposed on a push driving member 7, and the first connecting member 3 is fixed on the support frame 1. The support frame 1 includes two supporting arms 11 respectively disposed at two ends of the packaging bag 9, each of which Each of the support arms 11 is provided with a set of flat push drive members 7, and the push drive member 7 includes a rodless cylinder 71 and a slider 72. The drive ends of the rodless cylinders 71 of each set of push drive members 7 respectively pass through the slider 72 and The second connecting member 4 is connected at both ends, and the flat pushing driving member 7 at the two ends of the second connecting member 4 drives the sliding block 72 to drive the second connecting member 4 to move relative to the first connecting member 3, so that the movement of the second connecting member 4 can be performed. Keeping it steady, the vibration and shaking of the packaging bag 9 are reduced as much as possible. After the opening and closing assembly stops moving, since the two supporting arms 11 disposed at the two ends of the packaging bag 9 form a support for the opening and closing assembly, the entire opening and closing assembly does not It will vibrate and shake, so the package 9 can also be quickly stationary, thereby providing favorable conditions for subsequent charging operation or heat sealing operation; meanwhile, since the second connecting member 4 is opposed to the first by the flat pushing driving member 7 The connecting member 3 performs a translational movement, which can make the heat sealing It is more uniform, and the heat sealing time of each segment is equal, so that partial melting and partial unheating due to uneven heat sealing force can be effectively avoided. The push-pull driving member 7 includes a rodless cylinder 71 and a slider 72. The rodless cylinder 71 is mounted on the support frame 1 and arranged in the same direction as the second connecting member 4, and the slider 72 is mounted on the rodless cylinder 71. The driving end is connected to the second connecting member 4, and the translational movement of the second connecting member 4 can be realized by the rodless cylinder 71 and the slider 72.

In this embodiment, the first connecting member 3 and the second connecting member 4 are respectively provided with a vacuum suction cup 10, and the packaging bag is opened.

When the bag mouth of 9 is first, the two vacuum suction cups 10 respectively suck the two sides of the packaging bag 9, and then the bag mouth of the packaging bag 9 is pulled apart by the translational movement of the second connecting member 4. Referring to FIG. 5, in other embodiments, the vacuum chucks 10 on the first connecting member 3 and the second connecting member 4 may also be more than two (three shown in FIG. 5), and the first connecting member 3 is The vacuum chuck 10 is symmetrically arranged with the vacuum chuck 10 on the second connecting member 4. At this time, the vacuum chuck 10 is preferably provided with a spring type vacuum chuck to accommodate the opening and closing of the package 9. The heat sealing assembly 6 is a heat sealing head, and the heat sealing head is mounted on the first connecting member 3 and/or the second connecting member 4. The heat sealing head of the embodiment is provided with a plurality of heat sealing heads, and is divided into the first connecting member 3 and the second connecting member. On the 4th.

In this embodiment, the link set further includes a limiting rod 83. The two ends of the limiting rod 83 are respectively hinged with the clamping mechanism 2 and the first connecting member 3. In the same connecting rod set, the limiting rod 83 is in the clamping mechanism. The hinge center a on the 2 is different from the hinge center c of the first link 81 on the clamping mechanism 2, and a, c are arranged along the relative movement direction of the first link 3 and the second link 4 to make the structure more compact. In the same link set, the connecting lines of the two hinge centers a and b of the limiting rod 83 are parallel and equal in length to the connecting lines of the two hinge centers c and d of the first link 81, that is, a, b, c, d four. The hinge centers can be connected into a parallelogram, so that the connection of the hinge rod 83 and the first link 81 on the hinge center a, c of the clamping mechanism 2 is always the first with the limit lever 83 and the first link 81. The connecting lines of the hinge centers b and d on the connecting member 3 are kept parallel. Since the first connecting member 3 does not rotate, the connecting lines of the hinge centers b and d are not deflected, so that the connection of the 3 and the c can be ensured. The deflection does not occur, thereby restricting the rotation of the gripping mechanism 2, and ensuring that the package 9 is accurately charged.

In this embodiment, the first link 81 and the second link 82 each include a fixed section 841 and a telescopic section 842. The second link 82 is exemplified, and the fixed section 841 is hinged to the second connecting member 4, and the telescopic section The 842 is hinged to the clamping mechanism 2, and the telescoping section 842 is coupled to the fixed section 841 and is axially movable along the fixed section 841. The overall length of the first link 81 or the second link 82 can be adjusted by the axial movement of the telescopic section 842 to accommodate the package 9 of different opening sizes, and by adjusting the first link 81 or the second link The overall length of 82 can compensate for errors caused by manufacturing and assembly, and the clamp mechanism 2 after installation is placed at a predetermined position to accurately hold the package bag 9.

As shown in FIG. 4, in this embodiment, one end of the fixing portion 841 is provided with an internally threaded hole 843 in the axial direction, and the telescopic section 842 is provided with an external thread 844 which is coupled with the internally threaded hole 843, by making the telescopic section 842 The overall length of the first link 81 or the second link 82 can be adjusted by rotating in the internally threaded hole 843 of the fixed section 841. The front end of the internally threaded hole 843 is provided with a circular hole 845 having a smooth inner wall. The telescopic section 842 is provided with a shoulder portion 846 which cooperates with the circular hole 845. When installed, the externally threaded end of the telescopic section 842 first passes through the fixed section 841. a circular hole 845, which is screwed into the internally threaded hole 843, and the shoulder portion The cooperation of the 846 with the circular hole 845 can isolate the external thread 844 of the telescopic section 842 and the internally threaded hole 843 of the fixed section 841 from the outside. Since the external thread 844 and the internally threaded hole 843 are both located inside the connecting rod and are not in direct contact with the outside, it is not easy to breed bacteria, which is very important for the pharmaceutical industry where hygienic conditions are high.

In this embodiment, the outer wall of the fixing portion 841 is provided with a fastening screw hole 847 communicating with the circular hole 845. A fastening screw 848 is screwed into the fastening screw hole 847, and the fastening screw 848 is pressed against the shoulder portion 846. Cooperate, press and position the telescopic section 842 to prevent it from loosening.

In this embodiment, each of the clamping mechanisms 2 is provided with two upper and lower clamping positions 23 for clamping the packaging bag 9. When the clamping mechanism 2 clamps the packaging bag 9, the four clamping positions 23 are simultaneously clamped. The packaging bag 9 has a heat sealing area surrounded by the connection lines of the four clamping positions 23, which is flat and has no wrinkles. The heat sealing head is located between the upper and lower clamping positions 23 of the clamping mechanism 2, and the heat sealing head is heat sealed. At the same time, the portion of the packaging bag 9 between the upper and lower clamping positions 23 in the vertical direction is heat-sealed. The thermal cooperation is completed in the above flat, non-pleated heat sealing region, thereby effectively avoiding partial unheating caused by wrinkles; meanwhile, since the four clamping positions 23 are distributed in two rows, two in the lower row The clamping position 23 bears most of the weight, minimizes the pulling force of the gravity of the material contained in the packaging bag 9 on the heat sealing region, and can effectively prevent the heat sealing region from being excessively pulled due to the tensile force during the heat sealing process. Partially blown phenomenon. The heat sealing and sealing device of the packaging bag of the invention has the advantages of simple structure, high degree of automation, large overall operation space, convenient operation and reduced labor intensity of the operator. The four clamping positions 23 of the two holding mechanisms 2 are located in the same plane, which further ensures the flatness of the heat sealing region and reduces the probability of wrinkles. The clamping mechanism 2 is provided with clamping cylinders 21 at each clamping position 23, and the driving end of the clamping cylinder 21 is provided with a clamping pressing head 22, which can drive the clamping pressing head 22 to press or release the packaging. The bag 9 is provided, and it is convenient to control the four clamping positions 23 while sandwiching the packaging bag 9, so that wrinkles in the heat sealing region can be avoided.

Referring to FIG. 1, in the embodiment, a built-in air passage is provided on the support frame 1, the clamping mechanism 2, the first connecting member 3 and the second connecting member 4, and the built-in air passage on the support frame 1 passes through a plurality of air pipes. 12 is respectively connected with the built-in air passages on the clamping mechanism 2, the first connecting member 3 and the second connecting member 4. By providing the built-in air passage, the pipeline structure is greatly simplified, the exposed pipeline is reduced, and the overall appearance is improved. Simplicity.

Working principle: the rodless cylinder 71 drives the second connecting member 4 to translate to the open state of the opening and closing assembly (as shown in FIG. 3, in this process, the rodless cylinder 71 drives the sliding block 72 to drive the second connecting member 4 away from the first The direction of movement of the connecting member 3, the second connecting member 4 simultaneously drives the first connecting rod 81, the second connecting rod 82 and the limiting rod 83 to perform an outwardly extending deformation motion centering on the clamping mechanism 2), and then the packaging bag 9 is respectively inserted into the two clamping mechanisms 2, and the upper left, lower left, upper right, and lower right four clamping positions 23 formed by the two clamping mechanisms 2 form a clamping on the packaging bag 9, and when the packaging bag 9 is clamped, The clamping cylinder 21 of each clamping position 23 drives the clamping ram 22 while clamping the four points on the packaging bag 9; after the clamping of the packaging bag 9 is completed, the rodless cylinder 71 drives the second connecting member 4 to translate to The closed state of the opening and closing assembly (as shown in FIG. 2, in this process, the rodless cylinder 71 drives the slider 72 to drive the second connecting member 4 to move in the direction of the first connecting member 3, until two The two sides of the bag 9 are sucked by the vacuum chuck 10, and then the second connecting member 4 is driven by the rodless cylinder 71 to translate to the open state of the opening and closing assembly, so that the two vacuum cups 10 are mutually connected. Keep away from the bag opening of the bag 9 to fall into the material; after the blanking is stopped, the rodless cylinder 71 drives the second connecting member 4 to translate to the closed state of the opening and closing assembly, and the heat sealing assembly 6 is energized and heated, thereby completing The heat sealing of the package 9 is followed by the clamping cylinder 21 of each clamping position 23 driving the clamping head 22 to release the packaging bag 9, and the operator can take out a bag of sealed packaged material. The above-mentioned automated processes all have signal feedback, and the overall action is controlled by PLC. The structure is simple, the degree of automation is high, the overall operation space is large, the operation is easy, and the labor intensity of the operator is reduced.

The above is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, and all the technical solutions falling under the inventive concept belong to the protection scope of the present invention. It should be noted that a number of modifications and adaptations of the present invention are considered to be within the scope of the present invention without departing from the principles of the invention.

Claims

Rights request

1. A heat sealing device for packaging bags, including a heat sealing component (6), a support frame (1) and an opening and closing component installed on the support frame (1) for controlling the opening and closing of the packaging bag (9). It is characterized in that: the opening and closing assembly includes two clamping mechanisms (2) located at both ends of the packaging bag (9), and first connections that are respectively arranged on both sides of the packaging bag (9) and are relatively movable. (3) and the second connecting piece (4), each clamping mechanism (2) is connected to a connecting rod group, and the connecting rod group includes a first connecting rod (81) and a second connecting rod (81). 82), the two ends of the first connecting rod (81) are respectively hinged with the clamping mechanism (2) and the first connecting piece (3), and the two ends of the second connecting rod (82) are respectively connected with the clamping mechanism (2) and the second connecting piece (4) are hinged.

2. The packaging bag heat sealing device according to claim 1, characterized in that: the second connecting member (4) is provided on a flat push driving member (7).

3. The heat sealing device for packaging bags according to claim 2, characterized in that: the first connecting piece (3) is fixed on the support frame (1), and the support frame (1) includes two support arms. (11), each support arm (11) is provided with a set of horizontal push driving parts (7). The horizontal push driving parts (7) include a rodless cylinder (71) and a slide block (72). Each set of horizontal push driving parts (7) The driving end of the rodless cylinder (71) that pushes the driving member (7) is connected to both ends of the second connecting member (4) through the slider (72).

4. The packaging bag heat sealing device according to claim 1 or 2 or 3, characterized in that: the connecting rod group further includes a limiting rod (83), and the two ends of the limiting rod (83) are respectively connected to The clamping mechanism (2) and the first connecting piece (3) are hinged, and the hinge center of the limit rod (83) on the clamping mechanism (2) and the first connecting rod (81) are on the clamping mechanism (2) have different hinge centers. In the same connecting rod group, the line connecting the two hinge centers of the limiting rod (83) is parallel and equal in length to the line connecting the two hinge centers of the first connecting rod (81).

5. The packaging bag heat sealing device according to claim 4, characterized in that: the hinge center of the limiting rod (83) and the first connecting rod (81) on the same clamping mechanism (2) is along the first The relative movement direction of the connecting piece (3) and the second connecting piece (4) is arranged.

6. The packaging bag heat sealing device according to claim 1, 2 or 3, characterized in that: the first connecting rod (81) and the second connecting rod (82) both include a fixed section (841) and a telescopic section. (842), the telescopic section (842) is connected to the fixed section (841) and can move axially along the fixed section (841).

7. The heat sealing device for packaging bags according to claim 6, characterized in that: one end of the fixed section (841) is provided with an internal thread hole (843) along the axial direction, and the telescopic section (842) is provided with a External thread (844) that matches the internal thread hole (843).

8. The heat sealing device for packaging bags according to claim 7, characterized in that: the internal thread hole (843) The front end is provided with a round hole (845), and the telescopic section (842) is provided with a shoulder (846) that matches the round hole (845).

9. The heat sealing device for packaging bags according to claim 8, characterized in that: a fastening screw hole (847) connected to the round hole (845) is provided on the outer wall of the fixed section (841), and the fastening screw hole (847) is provided on the outer wall of the fixed section (841). A fastening screw (848) is screwed into the fastening hole (847), and the fastening screw (848) is in a tight fit with the shaft shoulder (846).

10. The packaging bag heat sealing device according to claim 4, characterized in that: the first connecting rod (81) and the second connecting rod (82) both include a fixed section (841) and a telescopic section (842), The telescopic section (842) is connected to the fixed section (841) and can move axially along the fixed section (841).

11. The heat sealing device for packaging bags according to claim 10, characterized in that: one end of the fixed section (841) is provided with an internal thread hole (843) along the axial direction, and the telescopic section (842) is provided with a External thread (844) that matches the internal thread hole (843).

12. The heat sealing device for packaging bags according to claim 11, characterized in that: the front end of the internal thread hole (843) is provided with a round hole (845), and the telescopic section (842) is provided with a round hole. The hole (845) matches the shoulder portion (846).

13. The heat sealing device for packaging bags according to claim 12, characterized in that: a fastening screw hole (847) connected to the round hole (845) is provided on the outer wall of the fixed section (841), and the fastening screw hole (847) is provided on the outer wall of the fixed section (841). A fastening screw (848) is screwed into the fastening hole (847), and the fastening screw (848) is in a tight fit with the shaft shoulder (846).

14. The heat sealing device for packaging bags according to claim 1, 2 or 3, characterized in that: the heat sealing component (6) is a heat sealing head, and the heat sealing head is installed on the first connector (3) and/or On the second connector (4).

15. The heat sealing device for packaging bags according to claim 1 or 2 or 3, characterized in that: the first connector (3) and the second connector (4) are both equipped with vacuum suction cups (10) .

16. The heat sealing device for packaging bags according to claim 15, characterized in that: there are more than two vacuum suction cups (10) on the first connector (3) and the second connector (4).

17. The heat sealing device for packaging bags according to claim 16, characterized in that: the vacuum suction cup (10) is a spring-attached vacuum suction cup.

18. The heat sealing device for packaging bags according to claim 1 or 2 or 3, characterized in that: the support frame (1), the clamping mechanism (2), the first connecting piece (3) and the second connecting piece (4) are equipped with built-in air channels, and the built-in air channels on the support frame (1) are respectively connected to the clamping mechanism (2), the first connecting piece (3) and the second connection through a plurality of air pipes (12). Built-in airway connection on piece (4).

19. The heat sealing device for packaging bags according to claim 1, 2 or 3, characterized in that: each clamping mechanism (2) is provided with upper and lower two for clamping the packaging bag (9). Clamping position (23), the heat sealing component (6) performs a heat sealing operation on the portion of the packaging bag (9) between the upper and lower clamping positions (23) in the vertical direction during heat sealing.

20. The heat sealing device for packaging bags according to claim 19, characterized in that: all clamping positions (23) of a pair of clamping mechanisms (2) are located in the same plane.

21. The heat sealing device for packaging bags according to claim 19, characterized in that: the clamping mechanism (2) is equipped with a clamping cylinder (21) at each clamping position (23), and the clamping mechanism (2) is equipped with a clamping cylinder (21) at each clamping position (23). The driving end of the cylinder (21) is equipped with a clamping head

(twenty two).