A heat sealing mechanism of a sealing machine

Abstract

This utility model relates to the technical field of bag sealing, and proposes a heat sealing mechanism for a sealing machine. It includes an upper pressure roller assembly located above a lower pressure roller assembly, forming a heat sealing station for sealing the bag between the upper and lower pressure roller assemblies. The upper pressure roller assembly includes a rotatable upper pressure roller and a heating element that transfers heat to the upper pressure roller. The lower pressure roller assembly includes a rotatable lower pressure roller. As the bag to be sealed passes through the heat sealing station, the upper pressure roller, heated by the heating element, rolls and presses against the lower pressure roller, achieving continuous heat sealing of the bag opening. When the bag moves along the heat sealing station, the upper pressure roller, heated by the heating element, rolls and presses against the lower pressure roller, achieving continuous heat sealing of the bag opening. The rolling pressing method of the upper and lower pressure rollers allows for more even force distribution on the bag during the heat sealing process, and the rotatable upper pressure roller allows the bag to move smoothly between the upper and lower pressure rollers.

Description

Technical Field

[0001] This utility model relates to the technical field of bag sealing, specifically to a heat sealing mechanism for a sealing machine. Background Technology

[0002] In the packaging industry, heat sealing technology is a common method that uses heat to partially melt packaging materials (such as plastic films, composite films, or aluminum foil) and then bonds them together under pressure to form a sealing structure. Given the long length of packaging bags, a dynamic heat sealing process can be used, allowing the packaging bag to complete the heat sealing operation synchronously during continuous movement, thus achieving efficient and reliable bag sealing. Therefore, a corresponding sealing machine needs to be designed. Utility Model Content

[0003] This utility model proposes a heat sealing mechanism for a sealing machine. When the bag to be sealed moves along the heat sealing station, the upper pressure roller, under the heating action of the heating element, rolls and presses the bag to be sealed with the lower pressure roller, realizing continuous heat sealing of the bag opening. The rolling pressing method of the upper and lower pressure rollers can make the bag body more evenly stressed during the heat sealing process. Moreover, the upper pressure roller can be rotated, allowing the bag body to move smoothly between the upper and lower pressure rollers.

[0004] A heat sealing mechanism for a sealing machine designed for this purpose includes an upper pressure roller assembly located above the lower pressure roller assembly, and a heat sealing station for sealing the bag is formed between the upper pressure roller assembly and the lower pressure roller assembly. The upper pressure roller assembly includes a rotatable upper pressure roller and a heating element that transfers heat to the upper pressure roller.

[0005] The lower pressure roller assembly includes a rotatable lower pressure roller. When the bag to be sealed passes through the heat sealing station, the upper pressure roller rolls and presses the bag to be sealed against the lower pressure roller under the heating action of the heating element, so as to achieve continuous heat sealing of the bag opening.

[0006] The upper pressure roller assembly includes a heat-conducting component, which is disposed adjacent to the heating element to transfer the heat generated by the heating element to the upper pressure roller. The heat-conducting component is fixedly disposed on the upper pressure roller assembly, and the upper pressure roller is sleeved on the heat-conducting component, with relative rotation between the upper pressure roller and the heat-conducting component.

[0007] The upper pressure roller assembly includes a temperature sensor that acts on the heat-conducting component to detect the temperature of the heat-conducting component.

[0008] The upper pressure roller assembly includes a front housing, and a heating element is installed between the inner sides of the front housing and the heat-conducting element;

[0009] The upper pressure roller assembly includes a rear housing, and a temperature sensor is installed between the heat-conducting component and the inner side of the rear housing.

[0010] A through hole for leading out the heating element wire is provided between the heat-conducting component and the rear housing.

[0011] The heat-conducting component is provided with a first limiting flange, the rear housing is provided with a second limiting flange, and the upper pressure roller is rotatably disposed on the outer ring of the heat-conducting component and limited between the first limiting flange and the second limiting flange;

[0012] Both the bottom of the front and rear shells are provided with clearance openings corresponding to the heat-sealing area of ​​the pressure roller, so as to avoid the pressure on the bag body during the heat-sealing process.

[0013] The rear housing is provided with an installation groove cavity, which extends through both ends of the rear housing. A limiting block is provided on the rear housing, and the temperature sensor is installed in the installation groove cavity and limited to the inner side of the limiting block.

[0014] The heat sealing mechanism of the sealing machine further includes a bracket assembly for supporting the upper pressure roller assembly and the lower pressure roller assembly, the lower pressure roller assembly being rotatably connected to the bracket assembly; a power component is provided on the bracket assembly, and the output end of the power component is drively connected to the lower pressure roller assembly;

[0015] The support assembly is equipped with an electric traction wheel assembly for moving the bag body;

[0016] The bracket assembly is equipped with a detection component for detecting the displacement of the bag body to trigger the start and stop of the power component and the electric traction wheel assembly;

[0017] The detection component includes a micro switch and a rotatable actuator. When the bag moves along the heat-sealing station, it pushes the actuator to rotate and triggers the micro switch, causing the power component to start running. When the bag moves away from the actuator during the heat-sealing process, the micro switch is disconnected, and the power component and the electric traction wheel assembly stop running.

[0018] The actuator is equipped with a first lever and a second lever. When the bag moves along the heat sealing station, the first lever pushes the actuator to rotate, and the actuator triggers a micro switch through the second lever.

[0019] The bracket assembly is provided with a support column that cooperates with the upper pressure roller assembly, and the bracket assembly is provided with an assembly cavity for accommodating the installation of the lower pressure roller assembly; the lower pressure roller of the lower pressure roller assembly is provided with a rotating shaft extending out of the assembly cavity.

[0020] The bracket assembly includes a support base, an assembly cavity is disposed on the support base, and a fixing block connected to the support column is provided inside the assembly cavity.

[0021] The power assembly includes a gear set disposed on the outside of the support base, and a connecting shaft that engages with the gear set is provided on the outside of the support base.

[0022] The bracket assembly includes a mounting plate connected to the support base, and a power component including a motor mounted on the mounting plate. The motor shaft is connected to the input end of the gear set, and the rotating shaft of the lower pressure wheel is connected to the output end of the gear set. The motor runs and drives the rotating shaft to rotate through the gear set, and the lower pressure wheel rotates with the rotating shaft.

[0023] The pressure roller assembly includes a flexible component sleeved on the outer ring of the pressure roller;

[0024] The support base is provided with two guide blocks arranged vertically at intervals. The guide block is used to guide the bag body to the heat sealing station through a guide groove. The guide groove is connected to the heat sealing station. Both guide blocks are provided with through slots. The first lever of the actuating element extends out of the through slot so that the bag body contacts the first lever when it enters the heat sealing station along the guide groove.

[0025] The beneficial technical effects of this utility model are as follows:

[0026] As the bag body moves along the heat-sealing station, the upper pressure roller, heated by the heating element, rolls and presses against the lower pressure roller, achieving continuous heat sealing of the bag body and opening. The rolling pressing method of the upper and lower pressure rollers allows the bag body to be subjected to more even force during the heat sealing process. Furthermore, the upper pressure roller can be rotated, allowing the bag body to move smoothly between the upper and lower pressure rollers. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a sealing machine according to an embodiment of the present invention.

[0028] Figure 2 This is a cross-sectional structural diagram of a sealing machine according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic cross-sectional view of the pressure roller assembly according to an embodiment of the present invention.

[0030] Figure 4 This is an exploded view of the assembly structure of the upper pressure roller assembly according to an embodiment of the present invention.

[0031] Figure 5 This is an exploded view of the upper pressure roller assembly from another angle in one embodiment of the present invention.

[0032] Figure 6 This is an exploded view of the assembly structure of the upper pressure roller assembly and the bracket assembly according to an embodiment of the present invention.

[0033] Figure 7 This is a schematic diagram of the assembly cross-section of the pressure roller assembly and the bracket assembly according to an embodiment of the present invention.

[0034] Figure 8This is a schematic diagram of the assembly cross-section of the upper pressure roller assembly and the bracket assembly from another position according to an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] See Figures 1-8 A heat sealing mechanism for a sealing machine includes an upper pressure roller assembly 1 located above a lower pressure roller assembly 2, and a heat sealing station for sealing a bag is formed between the upper pressure roller assembly 1 and the lower pressure roller assembly 2. The upper pressure roller assembly 1 includes a rotatable upper pressure roller 3 and a heating element 4 for transferring heat to the upper pressure roller 3.

[0037] The lower pressure roller assembly 2 includes a rotatable lower pressure roller 5. When the bag to be sealed passes through the heat sealing station, the upper pressure roller 3 rolls and presses the bag to be sealed with the lower pressure roller 5 under the heating action of the heating element 4, so as to achieve continuous heat sealing of the bag opening.

[0038] As the bag body moves along the heat-sealing station, the upper pressure roller 3, under the heating action of the heating element 4, rolls and presses the bag body to be sealed with the lower pressure roller 5, realizing continuous heat sealing of the bag body and the bag opening. The rolling pressing method of the upper pressure roller 3 and the lower pressure roller 5 can make the bag body more evenly stressed during the heat sealing process. Moreover, the upper pressure roller 3 can be rotated, so that the bag body can move smoothly between the upper pressure roller 3 and the lower pressure roller 5.

[0039] The upper pressure roller assembly 1 includes a heat-conducting element 6, which is disposed adjacent to the heating element 4 to transfer the heat generated by the heating element 4 to the upper pressure roller 3. The heat-conducting element 6 is fixedly disposed on the upper pressure roller assembly 1, and the upper pressure roller 3 is sleeved on the heat-conducting element 6, and the upper pressure roller 3 and the heat-conducting element 6 rotate relative to each other.

[0040] The fixed setting of the heat-conducting component 6 and the rotatable design of the upper pressure roller 3 ensure effective heat conduction without affecting the rolling pressing action of the upper pressure roller 3 and the lower pressure roller 5, making the heat sealing process smoother.

[0041] The heat-conducting component 6 is a mica sheet. The mica sheet can withstand temperatures above 600°C and has strong high-temperature resistance.

[0042] The upper pressure roller assembly 1 includes a temperature sensor 7 that acts on the heat-conducting element 6 to detect the temperature of the heat-conducting element 6.

[0043] The upper pressure roller assembly 1 includes a front housing 8, and a heating element 4 is installed between the inner sides of the front housing 8 and the heat-conducting element 6;

[0044] The upper pressure roller assembly 1 includes a rear housing 9, and a temperature sensor 7 is installed between the heat-conducting component 6 and the inner side of the rear housing 9.

[0045] Temperature sensor 7 provides feedback on the temperature of heat-conducting component 6. When the temperature of heat-conducting component 6 reaches the set value, heating element 4 stops heating. When the temperature of heat-conducting component 6 drops below the set value, heating element 4 restarts and resumes heating. When temperature sensor 7 detects that the temperature of heat-conducting component 6 is too high, heating element 4 stops heating to prevent overheating, deformation, or scorching of the packaging material. When temperature sensor 7 detects that the temperature of heat-conducting component 6 is too low, heating element 4 resumes heating to prevent insecure sealing due to insufficient temperature.

[0046] The front housing 8 has a protruding buckle 35, and the rear housing 9 has a fastening groove 36. The protruding buckle 35 and the fastening groove 36 fasten together, fixing the front housing 8 and the rear housing 9 together. This allows the heat-conducting component 6, the upper pressure roller 3, the heating element 4, and the temperature sensor 7 to be stably installed between the front housing 8 and the rear housing 9, making the entire upper pressure roller assembly 1 more compact. In addition, the front housing 8 and the rear housing 9 also provide some thermal insulation, preventing the heat from the heating element 4 from escaping. The heat from the heating element 4 can be effectively transferred to the heat-conducting component 6, and then further transferred to the upper pressure roller 3.

[0047] A wire hole 10 for leading out the heating element wire is provided between the heat-conducting component 6 and the rear housing 9.

[0048] The wiring hole 10 provides a reasonable channel for the lead wires of the heating element 4, making the arrangement of the wires more neat and orderly, and facilitating the electrical connection between the heating element 4 and the corresponding electrical components.

[0049] The heat-conducting component 6 is provided with a first limiting flange 11, the rear housing 9 is provided with a second limiting flange 12, and the upper pressure roller 3 is rotatably disposed on the outer ring of the heat-conducting component 6 and limited between the first limiting flange 11 and the second limiting flange 12.

[0050] Both the bottom of the front housing 8 and the rear housing 9 are provided with clearance openings 13 corresponding to the heat sealing area of ​​the pressure roller 3, so as to avoid the pressure on the bag body during the heat sealing process.

[0051] The upper pressure roller 3 is rotatably mounted on the outer ring of the heat-conducting component 6 and limited between the first limiting flange 11 and the second limiting flange 12. This limiting structure ensures the stability and accuracy of the upper pressure roller 3 during rotation and prevents axial movement of the upper pressure roller 3. Both the bottom of the front housing 8 and the rear housing 9 are provided with clearance openings 13 corresponding to the heat-sealing area of ​​the upper pressure roller 3. During the heat-sealing process, the clearance openings 13 provide sufficient space for the compressed bag to form effective contact with the upper pressure roller 3.

[0052] The rear housing 9 is provided with a mounting cavity 14, which extends through both ends of the rear housing 9. A limiting block 15 is provided on the rear housing 9. The temperature sensor 7 is installed in the mounting cavity 14 and is limited to the inside of the limiting block 15.

[0053] The limiting block 15 is integrally formed with the rear housing 9, and an opening gap is provided between the bottom of the limiting block 15 and the rear housing 9 to connect with the mounting cavity 14. The limiting block 15 has an L-shaped cross-section to fit the mounting cavity 14 and limit the installation of the temperature sensor 7.

[0054] A limiting block 15 is provided on the rear housing 9, and the temperature sensor 7 is installed in the mounting cavity 14 and limited by the inner side of the limiting block 15. This installation method makes the installation of the temperature sensor 7 more convenient and secure, avoiding displacement of the temperature sensor 7 due to vibration, shaking, or other factors, thereby ensuring the accuracy and reliability of temperature detection. The through-hole design at both ends of the mounting cavity 14 facilitates the installation and removal of the temperature sensor 7. When it is necessary to inspect, calibrate, or replace the temperature sensor 7, it can be operated from both ends of the mounting cavity 14, improving the convenience of maintenance. At the same time, the setting of the limiting block 15 can precisely limit the temperature sensor 7, preventing the temperature sensor 7 from detaching from the rear of the mounting cavity 14.

[0055] The heat-conducting component 6 is fixedly connected to the rear housing 9 by screws. The rear housing 9 is provided with a lateral extension 36 for inserting screws, and the heat-conducting component 6 is provided with a countersunk hole 37 for inserting screws.

[0056] The heat sealing mechanism of the sealing machine also includes a bracket assembly 16 for supporting the upper pressure roller assembly 1 and the lower pressure roller assembly 2, the lower pressure roller assembly 2 being rotatably connected to the bracket assembly 16; a power assembly 18 is provided on the bracket assembly 16, and the output end of the power assembly 18 is connected to the lower pressure roller assembly 2 in a transmission manner.

[0057] The bracket assembly 16 is equipped with an electric traction wheel assembly 39 for moving the bag; the electric traction wheel assembly 39 is located in front of the heat sealing station;

[0058] The bracket assembly 16 is provided with a detection component 23 for detecting the displacement of the bag body to trigger the start and stop of the power component 18 and the electric traction wheel assembly 39;

[0059] The detection component 23 includes a micro switch 20 and a rotatable actuator 19. When the bag moves along the heat sealing station, it pushes the actuator 19 to rotate and triggers the micro switch 20, causing the power component 18 to start running. When the bag moves away from the actuator 19 during the heat sealing process, the micro switch 20 is disconnected, and the power component 18 and the electric traction wheel assembly 39 stop running.

[0060] The bag slides into the microswitch 20, pushing the actuator 19 to rotate. The microswitch 20 is triggered by the actuator 19, causing the power unit 18 to rotate. The bag moves along the heat-sealing station to achieve heat fusion sealing. When the sealed bag enters between the upper and lower traction wheels of the electric traction wheel assembly 39, the electric traction wheel assembly 39 pulls the bag to continue moving. When the tail of the bag is pulled by the electric traction wheel assembly 39 close to the heat-sealing station, the bag slides out from the actuator 19 and detaches from it. The power unit 18 and the electric traction wheel assembly 39 stop operating, leaving a small section of the bag unsealed. The sealing process is temporarily stopped, and a vacuum is drawn from the unsealed section. After the vacuum is drawn, the sealing process continues.

[0061] The electric traction wheel assembly 39 includes an upper traction wheel and a lower traction wheel that are spaced apart vertically. Both the upper and lower traction wheels are provided with a rotating connecting shaft that rotates on the mounting plate 29. Gears are provided on the rotating connecting shafts on both sides. The two gears mesh with each other for transmission. One of the gears meshes with one of the gears in the gear set 27. When the motor runs, both the upper and lower traction wheels can rotate to pull the bag body to move.

[0062] The actuating element 19 is provided with a first lever 21 and a second lever 22. When the bag moves along the heat sealing station, the actuating element 19 is pushed to rotate by the first lever 21, and the actuating element 19 triggers the micro switch 20 by the second lever 22.

[0063] The bracket assembly 16 is provided with a support column 17 that cooperates with the upper pressure roller assembly 1, and the bracket assembly 16 is provided with an assembly cavity 24 for accommodating and installing the lower pressure roller assembly 2; the lower pressure roller 5 of the lower pressure roller assembly 2 is provided with a rotating shaft 25 extending out of the assembly cavity 24.

[0064] The support column 17 has a cavity for inserting a connecting pin, and the rear housing 9 of the upper pressure roller assembly 1 has a connecting sleeve 38. When the upper pressure roller assembly 1 is assembled with the bracket assembly 16, the support column 17 is inserted into the connecting sleeve 38 of the rear housing 9, and the connecting sleeve 38 has an assembly hole for inserting a connecting pin. This allows the upper pressure roller assembly 1 to be mounted on the bracket assembly 16.

[0065] The bracket assembly 16 includes a support base, an assembly cavity 24 is disposed on the support base, and a fixing block 26 connected to the support column 17 is provided inside the assembly cavity 24.

[0066] The power assembly 18 includes a gear set 27 disposed on the outside of the support base, and a connecting shaft 28 cooperating with the gear set 27 is provided on the outside of the support base.

[0067] The bracket assembly 16 includes a mounting plate 29 connected to the support base, and the power assembly 18 includes a motor 30 mounted on the mounting plate 29. The motor shaft of the motor 30 is connected to the input end of the gear set 27, and the rotating shaft 25 of the lower pressure wheel 5 is connected to the output end of the gear set 27. The motor 30 runs and drives the rotating shaft 25 to rotate through the gear set 27, and the lower pressure wheel 5 rotates with the rotating shaft 25.

[0068] The pressure roller assembly 2 includes a flexible component 31 sleeved on the outer ring of the pressure roller 5.

[0069] When the bag to be sealed passes the upper pressure roller 3 and the lower pressure roller 5, the upper pressure roller 3 presses down on the bag under the action of gravity, and the soft part 31 makes elastic contact with the bag under the action of elasticity, so that the bag to be sealed contacts the upper pressure roller 3 from top to bottom.

[0070] The support base is provided with two guide blocks 32 arranged vertically and spaced apart. The guide block 32 is used to guide the bag body to the heat sealing station via a guide groove 33. The guide groove 33 is connected to the heat sealing station. Both guide blocks 32 are provided with through slots 34. The first lever 21 of the actuating member 19 extends out of the through slot 34 so that the bag body contacts the first lever 21 when it enters the heat sealing station along the guide groove.

[0071] The shaft hole of the pressure roller 5 is flat, while the rotating shaft 25 is a flat shaft structure to prevent relative rotation between the rotating shaft 25 and the pressure roller 5. The rotation of the rotating shaft 25 can drive the pressure roller 5 to rotate synchronously.

[0072] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat-sealing mechanism for a sealing machine, comprising an upper pressure roller assembly (1) located above a lower pressure roller assembly (2), wherein a heat-sealing station for sealing a bag is formed between the upper pressure roller assembly (1) and the lower pressure roller assembly (2), characterized in that: The upper pressure roller assembly (1) includes a rotatable upper pressure roller (3) and a heating element (4) that transfers heat to the upper pressure roller (3). The lower pressure roller assembly (2) includes a rotatable lower pressure roller (5). When the bag to be sealed passes through the heat sealing station, the upper pressure roller (3) rolls and presses the bag to be sealed with the lower pressure roller (5) under the heating action of the heating element (4), so as to achieve continuous heat sealing of the bag opening.

2. The heat sealing mechanism of the sealing machine according to claim 1, characterized in that: The upper pressure roller assembly (1) includes a heat-conducting element (6), which is arranged adjacent to the heating element (4) to transfer the heat generated by the heating element (4) to the upper pressure roller (3). The heat-conducting element (6) is fixedly arranged on the upper pressure roller assembly (1), and the upper pressure roller (3) is sleeved on the heat-conducting element (6), and the upper pressure roller (3) and the heat-conducting element (6) rotate relative to each other.

3. The heat sealing mechanism of the sealing machine according to claim 2, characterized in that: The upper pressure roller assembly (1) includes a temperature sensor (7) that acts on the heat conductor (6) to detect the temperature of the heat conductor (6).

4. The heat sealing mechanism of the sealing machine according to claim 3, characterized in that: The upper pressure roller assembly (1) includes a front housing (8), and a heating element (4) is installed between the inner sides of the front housing (8) and the heat-conducting element (6); The upper pressure roller assembly (1) includes a rear housing (9), and a temperature sensor (7) is installed between the heat-conducting component (6) and the inner side of the rear housing (9).

5. The heat sealing mechanism of the sealing machine according to claim 4, characterized in that: A wire hole (10) for leading out the wires of the heating element (4) is provided between the heat-conducting element (6) and the rear housing (9).

6. The heat sealing mechanism of the sealing machine according to claim 4, characterized in that: The heat-conducting component (6) is provided with a first limiting flange (11), the rear housing (9) is provided with a second limiting flange (12), and the upper pressure roller (3) is rotatably disposed on the outer ring of the heat-conducting component (6) and limited between the first limiting flange (11) and the second limiting flange (12); The bottom of the front shell (8) and the rear shell (9) are provided with clearance openings (13) corresponding to the heat sealing area of ​​the pressure roller (3) to avoid the pressure on the bag body during the heat sealing process.

7. The heat sealing mechanism of the sealing machine according to claim 4, characterized in that: The rear housing (9) is provided with an installation groove (14), the two ends of which are connected to the rear housing (9). A limiting block (15) is provided on the rear housing (9). The temperature sensor (7) is installed in the installation groove (14) and limited to the inside of the limiting block (15).

8. The heat sealing mechanism of the sealing machine according to claim 1, characterized in that: It also includes a bracket assembly (16) for supporting the upper pressure roller assembly (1) and the lower pressure roller assembly (2), the lower pressure roller assembly (2) being rotatably connected to the bracket assembly (16); the bracket assembly (16) is provided with a power assembly (18), the output end of the power assembly (18) being connected to the lower pressure roller assembly (2) in a transmission. The bracket assembly (16) is provided with an electric traction wheel assembly (39) for moving the bag body. The bracket assembly (16) is provided with a detection component (23) for detecting the displacement of the bag body to trigger the start and stop of the power assembly (18) and the electric traction wheel assembly (39). The detection component (23) includes a micro switch (20) and a rotatable actuator (19). When the bag moves along the heat sealing station, it pushes the actuator (19) to rotate and triggers the micro switch (20), causing the power component (18) to start running. When the bag moves away from the actuator (19) during the heat sealing process, the micro switch (20) is disconnected, and the power component (18) and the electric traction wheel assembly (39) stop running.

9. The heat sealing mechanism of the sealing machine according to claim 8, characterized in that: The actuating element (19) is provided with a first lever (21) and a second lever (22). When the bag moves along the heat sealing station, the actuating element (19) is pushed to rotate by the first lever (21), and the actuating element (19) triggers the micro switch (20) by the second lever (22).

10. The heat sealing mechanism of the sealing machine according to claim 8, characterized in that: The bracket assembly (16) is provided with a support column (17) that cooperates with the upper pressure roller assembly (1), and the bracket assembly (16) is provided with an assembly cavity (24) for accommodating the installation of the lower pressure roller assembly (2); the lower pressure roller (5) of the lower pressure roller assembly (2) is provided with a rotating shaft (25) extending out of the assembly cavity (24). The bracket assembly (16) includes a support base, an assembly cavity (24) is provided on the support base, and a fixing block (26) connected to the support column (17) is provided inside the assembly cavity (24). The power assembly (18) includes a gear set (27) disposed on the outside of the support base, and a connecting shaft (28) cooperating with the gear set (27) is provided on the outside of the support base. The bracket assembly (16) includes a mounting plate (29) connected to the support base, and a power assembly (18) includes a motor (30) mounted on the mounting plate (29). The motor shaft of the motor (30) is connected to the input end of the gear set (27), and the rotating shaft (25) of the pressure roller (5) is connected to the output end of the gear set (27). The motor (30) runs and drives the rotating shaft (25) to rotate through the gear set (27), and the pressure roller (5) rotates with the rotating shaft (25). The pressure roller assembly (2) includes a flexible component (31) sleeved on the outer ring of the pressure roller (5). The support base is provided with two guide blocks (32) arranged vertically and vertically. The guide block (32) is used to guide the bag body to the heat sealing station via a guide groove (33). The guide groove (33) is connected to the heat sealing station. Both guide blocks (32) are provided with through grooves (34). The first lever (21) of the action member (19) extends out of the through groove (34) so ​​that the bag body contacts the first lever (21) when it enters the heat sealing station along the guide groove.

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