A strip-packing machine filling and exhausting device

Abstract

The application discloses a strip bag packaging machine filling and exhaust device, and relates to the technical field of strip bag exhaust, which comprises a mounting assembly and an exhaust assembly. The mounting assembly is provided with an assembly groove. The exhaust assembly comprises a first extrusion unit and a second extrusion unit. The first extrusion unit and the second extrusion unit are arranged in the assembly groove and are rotationally connected with the mounting assembly. The first extrusion unit and the second extrusion unit are spaced apart along a first direction. A gap is formed between the first extrusion unit and the second extrusion unit to facilitate the passage of the strip bag. The first extrusion unit and the second extrusion unit can extrude the strip bag to exhaust the air in the strip bag. The strip bag packaging machine filling and exhaust device can avoid striking the strip bag during exhaust, thereby avoiding the problems of liquid clamping of the equipment and cracking of the sealing surface of the strip bag.

Description

Technical Field

[0001] This application relates to the field of strip bag venting technology, and in particular to a filling and venting device for a strip bag packaging machine. Background Technology

[0002] In the strip bag production line, the production of strip bags requires the longitudinal sealing mechanism to weld the long strip of packaging film into a long tube shape, and then the transverse sealing mechanism to perform a transverse sealing weld, welding a cross-section of the long tube packaging film, and then filling. After filling, the long tube is moved downward to the desired bag length position by the bag pulling mechanism, and then a transverse sealing weld is performed. Before this transverse sealing weld, the strip bag after filling is vented.

[0003] In existing technologies, most methods involve installing venting plates under the horizontal sealing welding surface. During horizontal sealing welding, the two welding surfaces move towards each other, and the two venting plates compress the strip-shaped bag, squeezing out excess air. The thickness of the strip-shaped bag can be changed by adjusting the distance between the two venting plates, thus meeting production requirements. However, in actual production, due to the high speed of the horizontal sealing mechanism's opposing movement, the venting plates exert significant impact force on the strip-shaped bag, causing strong compression of the welding surface. This can easily lead to cracking of the welded seal. Furthermore, the impact can cause liquid inside the strip-shaped bag to rise and splash onto the welding surface, creating a risk of liquid inclusion or even leakage during welding. Utility Model Content

[0004] The purpose of this application is to provide a filling and venting device for a strip bag packaging machine that can prevent the strip bag from being slapped during venting, thereby avoiding liquid trapping in the equipment and cracking of the sealing surface of the strip bag.

[0005] To achieve the above objectives, this application provides a filling and venting device for a strip bag packaging machine, located below the horizontal sealing mechanism of the packaging machine, and used to vent air from inside the strip bag. The filling and venting device for the strip bag packaging machine includes an installation component and a venting component. The installation component has an assembly groove, and the venting component includes a first extrusion unit and a second extrusion unit. Both the first extrusion unit and the second extrusion unit are located in the assembly groove and are rotatably connected to the installation component. The first extrusion unit and the second extrusion unit are spaced apart along a first direction, and there is a gap between the first extrusion unit and the second extrusion unit to facilitate the passage of the strip bag. The first extrusion unit and the second extrusion unit can extrude air from inside the strip bag by extruding the strip bag.

[0006] In some embodiments, the mounting component is provided with a dynamic balancing component, and the mounting component is connected to the horizontal sealing mechanism of the packaging machine through the dynamic balancing component. The dynamic balancing component is used to ensure that the mounting component remains stationary when the horizontal sealing mechanism of the packaging machine moves.

[0007] In some embodiments, the dynamic balancing assembly includes a fixed plate, a connecting shaft, and a connecting block. Both fixed plates are slidably engaged with the connecting shaft and are spaced apart along the axial direction of the connecting shaft. The two fixed plates are connected to the horizontal sealing mechanism of the packaging machine and can move towards or away from each other under the drive of the horizontal sealing mechanism. The connecting block is disposed on the mounting assembly and located between the two fixed plates. The connecting block is fixedly connected to the connecting shaft.

[0008] In some embodiments, the mounting assembly is provided with a limiting mechanism to ensure that the connecting block is located at the midpoint between the two fixing plates.

[0009] In some embodiments, the limiting mechanism includes two first limiting members and two second limiting members. The two first limiting members are respectively disposed at both ends of the connecting shaft and can respectively abut against the two fixed plates. The two second limiting members are respectively installed on the inner side of the two fixed plates and can abut against the connecting block.

[0010] In some embodiments, the mounting assembly is provided with an adjustment assembly, which includes a motion mechanism, a first mounting bracket, and a second mounting bracket. The first pressing unit is connected to the first mounting bracket, and the second pressing unit is connected to the second mounting bracket. The motion mechanism is provided on the mounting assembly and is used to drive the first mounting bracket and the second mounting bracket to move toward or away from each other, thereby changing the gap between the first pressing unit and the second pressing unit.

[0011] In some embodiments, the motion mechanism includes a lead screw, a knob, a first slide, and a second slide. The lead screw is rotatably fitted on the mounting assembly. The knob is located at the end of the lead screw. The lead screw has two threads with opposite directions of rotation. The first slide and the second slide are respectively threaded into the two threads. The first slide is connected to the first mounting bracket, and the second slide is connected to the second mounting bracket.

[0012] In some embodiments, the mounting assembly is provided with a braking mechanism that can limit the lead screw, thereby fixing the lead screw.

[0013] In some embodiments, the braking mechanism includes a fixing block and a set screw. The fixing block is disposed on the mounting assembly and has a through hole and a limiting hole. The through hole passes through both ends of the fixing block, and the limiting hole and the through hole are distributed in a T-shape. The lead screw passes through the fixing block through the through hole, and the set screw is disposed in the limiting hole. The set screw can abut against the lead screw, thereby fixing the lead screw.

[0014] In some embodiments, both the first extrusion unit and the second extrusion unit are composed of a plurality of extrusion members, and both the first mounting bracket and the second mounting bracket are provided with a plurality of mounting holes spaced apart along the second direction. The plurality of extrusion members are connected to the first mounting bracket or the second mounting bracket through corresponding mounting holes.

[0015] Compared to the aforementioned background technology, the strip bag packaging machine filling and venting device provided in this application embodiment is located below the horizontal sealing mechanism of the packaging machine and is used to vent air from inside the strip bag. The strip bag packaging machine filling and venting device includes an installation component and a venting component. The installation component has an assembly groove, and the venting component includes a first extrusion unit and a second extrusion unit. Both the first extrusion unit and the second extrusion unit are located in the assembly groove and are rotatably connected to the installation component. The first extrusion unit and the second extrusion unit are spaced apart along a first direction, and there is a gap between the first extrusion unit and the second extrusion unit to facilitate the passage of the strip bag. When the strip bag passes through, the first extrusion unit and the second extrusion unit can expel the air from inside the strip bag. Specifically, after completing one horizontal sealing weld and filling, the strip bag moves downwards under gravity and gradually approaches the exhaust assembly. The bottom of the strip bag moves to the gap between the first and second extrusion units and continues to move downwards. During this process, the first and second extrusion units can squeeze the strip bag located between them, thereby squeezing the air inside the strip bag upwards and expelling it from the opening at the top of the strip bag. As the strip bag moves downwards, the air inside the strip bag is gradually expelled. When the opening at the top of the strip bag moves to the horizontal sealing mechanism, the horizontal sealing mechanism performs a second horizontal sealing weld on the strip bag, completing the sealing of the strip bag. The filling and exhaust device of the strip bag packaging machine of this application expels the air inside the strip bag by squeezing, avoiding the strip bag being slapped during the exhaust process, thereby preventing liquid trapping in the equipment and cracking of the strip bag sealing surface. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the filling and venting device for the strip bag packaging machine provided in this application.

[0018] Figure 2 This is a top view of the filling and venting device for the strip bag packaging machine provided in this application.

[0019] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure 4 This is a front view of the filling and venting device for the strip bag packaging machine provided in this application.

[0021] Figure 5 for Figure 1 Enlarged view of point B in the middle.

[0022] in:

[0023] 1. Mounting assembly; 2. Exhaust assembly; 21. First extrusion unit; 22. Second extrusion unit; 3. Dynamic balancing assembly; 31. Fixing plate; 32. Connecting shaft; 33. Connecting block; 4. Limiting mechanism; 41. First limiting member; 42. Second limiting member; 5. Adjusting assembly; 51. Motion mechanism; 511. Lead screw; 512. Knob; 513. First slide; 514. Second slide; 52. First mounting bracket; 53. Second mounting bracket; 6. Braking mechanism; 61. Fixing block; 62. Top screw. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" used below are defined based on the accompanying drawings in the specification. The first direction of this application is the left-right direction, and the second direction is the up-down direction.

[0027] like Figure 1 and Figure 2As shown in the embodiment of this application, the filling and venting device of the strip bag packaging machine is located below the horizontal sealing mechanism of the packaging machine and is used to vent the air inside the strip bag. The filling and venting device of the strip bag packaging machine includes an installation component 1 and an venting component 2. The installation component 1 is composed of multiple steel plates, which form a rectangular frame structure, so that the installation component 1 has an assembly groove. The venting component 2 includes a first extrusion unit 21 and a second extrusion unit 22. The first extrusion unit 21 and the second extrusion unit 22 are both located in the assembly groove and are rotatably connected to the installation component 1. The first extrusion unit 21 and the second extrusion unit 22 are spaced apart in the left and right direction, and there is a gap between the first extrusion unit 21 and the second extrusion unit 22 to facilitate the passage of the strip bag. The first extrusion unit 21 and the second extrusion unit 22 can extrude the air inside the strip bag.

[0028] Understandably, after completing one horizontal sealing weld and filling, the strip moves downward under gravity and gradually approaches the exhaust assembly 2. The bottom of the strip bag moves to the gap between the first extrusion unit 21 and the second extrusion unit 22 and continues to move downward. During this process, the first extrusion unit 21 and the second extrusion unit 22 can squeeze the strip bag located between them, thereby squeezing the air inside the strip bag upward and expelling it from the opening at the top of the strip bag. As the strip bag moves downward, the air inside the strip is gradually expelled. When the opening at the top of the strip bag moves to the horizontal sealing mechanism, the horizontal sealing mechanism performs a second horizontal sealing weld on the strip bag, completing the sealing of the strip bag.

[0029] The filling and venting device for the strip bag packaging machine provided in this application embodiment can prevent the strip from being struck during venting, thereby avoiding liquid trapping and cracking of the strip bag sealing surface.

[0030] Based on the above embodiments, a dynamic balancing component 3 is provided on the mounting component 1, and the mounting component 1 is fixedly mounted on the horizontal sealing mechanism of the packaging machine through the dynamic balancing component 3.

[0031] Since the horizontal sealing mechanism needs to close and heat-seal the strip bag before separating and detaching from the strip bag during the horizontal sealing operation, in order to ensure that the strip bag can smoothly enter the gap between the second extrusion unit 22, it is necessary to ensure that the position of the strip bag and the filling and venting device of the packaging machine remains unchanged. Therefore, a dynamic balancing component 3 needs to be set in the mounting component 1 and the horizontal sealing mechanism of the packaging machine to prevent the opening and closing movement of the horizontal sealing mechanism of the packaging machine from causing the position of the strip bag and the filling and venting device of the packaging machine to change, so that the strip bag cannot be inserted into the gap between the first extrusion unit 21 and the second extrusion unit 22.

[0032] Based on the above embodiments, such as Figure 3As shown, the dynamic balancing component 3 includes a fixed plate 31, a connecting shaft 32, and a connecting block 33. There are two fixed plates 31, which are respectively fixedly installed on both sides of the horizontal sealing mechanism of the packaging machine. When the horizontal sealing mechanism of the packaging machine closes, the two fixed plates 31 move closer to each other. When the horizontal sealing mechanism of the packaging machine separates, the two fixed plates 31 move further away from each other. The two fixed plates 31 are slidably fitted on both sides of the connecting shaft 32, and the two are spaced apart along the axial direction of the connecting shaft 32. The connecting block 33 is fixedly installed on the connecting shaft 32, and the connecting block 33 is located between the two fixed plates 31. The connecting block 33 is fixedly connected to the mounting component 1.

[0033] When the horizontal sealing mechanism of the packaging machine closes or separates, the two fixed seats will move closer or further apart along the axial direction of the connecting shaft 32. Since the mounting component 1 and the exhaust component 2 have large masses, the connecting shaft 32 remains stationary when the fixed seats move along the axial direction of the connecting shaft 32, thus ensuring that the position of the filling and exhaust device of the packaging machine remains unchanged.

[0034] Based on the above embodiment, the mounting component 1 is provided with a limiting mechanism 4, which is used to ensure that the connecting block 33 is located at the midpoint of the two fixing plates 31.

[0035] Understandably, by setting the limiting mechanism 4, even if one of the fixed seats moves and drives the connecting shaft 32 to move synchronously due to an accident, the limiting mechanism 4 will block the connecting block 33, thereby ensuring that the connecting block 33 will eventually return to the midpoint between the two fixed seats.

[0036] Based on the above embodiments, such as Figure 3 and Figure 4 As shown, the limiting mechanism 4 includes two first limiting members 41 and two second limiting members 42. Both the two first limiting members 41 and the two second limiting members 42 can be limiting bolts. The two first limiting members 41 are fixedly installed at both ends of the connecting shaft 32, and both first limiting members 41 are located on the outside of the corresponding fixed seats. The two second limiting members 42 are respectively fixedly installed on the two fixed plates 31, and both second limiting members 42 are located on the inside of the two fixed plates 31. The two second limiting members 42 are symmetrically distributed.

[0037] Understandably, during the process of the two fixed plates 31 moving away from each other, if the left fixed plate 31 drives the connecting shaft 32 to move to the left under the action of friction, the first limiting member 41 on the right will gradually approach the right fixed plate 31 and abut against it. Since the right fixed plate 31 moves to the right during the process of moving away from each other, the right fixed plate 31 can drive the connecting shaft 32 to move to the right against the action of friction through the first limiting member 41 on the right. When the two fixed plates 31 move away from each other to their limit, the connecting block 33 returns to the midpoint between the two fixed plates 31. At this time, the two first limiting members 41 abut against the corresponding two fixed plates 31. During this process, the connecting shaft 32 and the connecting block 33 first move to the left and then to the right, and the distance moved to the left is the same as the distance moved to the right. Similarly, during the process of the two fixed plates 31 moving away from each other, if the right fixed plate 31 drives the connecting shaft 32 to move to the right, the limiting mechanism 4 can also return the connecting block 33 to the midpoint between the two fixed plates 31 after the two fixed plates 31 have moved to their limit. At the midpoint of the two fixed plates 31; during the process of the two fixed plates 31 approaching each other, if the left side drives the connecting shaft 32 to move to the right under the action of friction, the connecting block 33 will gradually approach the second limiting member 42 on the right side and stop with the second limiting member 42 on the right side. Since the right fixed plate 31 moves to the left during the process of approaching each other, the right fixed plate 31 will push the connecting block 33 and the connecting shaft 32 to move to the left through the second limiting member 42. When the two fixed plates 31 approach each other to the limit, the connecting block 33 returns to the midpoint of the two fixed plates 31. At this time, the two second limiting members 42 respectively abut against the two sides of the connecting block 33. During this process, the connecting block 33 and the connecting shaft 32 first move to the right and then move to the left, and the distance moved to the right is the same as the distance moved to the left. Similarly, during the process of the two fixed plates 31 approaching each other, if the right fixed plate 31 drives the connecting shaft 32 to move to the left, the limiting mechanism 4 can also make the connecting block 33 return to the midpoint of the two fixed plates 31 after the two fixed plates 31 move to the limit.

[0038] It is understood that in some other embodiments, soft limiting structures such as springs and buffer pads can be used to limit the movement of the connecting block 33.

[0039] In some embodiments, the mounting assembly 1 is provided with an adjustment assembly 5, which includes a motion mechanism 51, a first mounting bracket 52, and a second mounting bracket 53. A first pressing unit 21 is mounted on the first mounting bracket 52, and a second pressing unit 22 is mounted on the second mounting bracket 53. The motion mechanism 51 is disposed on the mounting assembly 1 and is used to drive the first mounting bracket 52 and the second mounting bracket 53 to move. Adjustment assemblies 5 are provided at both ends of the first pressing unit 21 and the second pressing unit 22. The two sets of adjustment assemblies 5 work together to move the first pressing unit 21 and the second pressing unit 22 closer together or further apart.

[0040] It is understandable that by driving the first mounting bracket 52 and the second mounting bracket 53 to move closer or further apart through the motion mechanism 51, the width of the gap between the first mounting bracket 52 and the second mounting bracket 53 can be changed. During the exhaust process, the thickness of the strip bag can be controlled by adjusting the width of the gap between the first mounting bracket 52 and the second mounting bracket 53, thereby providing reliable width dimensions for the design of the subsequent material handling line and the cartoning machine, which is convenient for subsequent processing.

[0041] Based on the above embodiments, such as Figure 2 and Figure 5 As shown, the motion mechanism 51 includes a lead screw 511, a knob 512, a first slide 513, and a second slide 514. The knob 512 is fixedly mounted on the lead screw 511. The lead screw 511 is rotatably fitted onto the mounting assembly 1. The lead screw 511 has two threads with opposite directions of rotation. The first slide 513 is threadedly fitted with the lead screw 511 through one of its threads, and the second slide 514 is threadedly fitted with the lead screw 511 through its other thread. The first mounting bracket 52 is fixedly mounted on the first slide 513, and the second mounting bracket 53 is fixedly mounted on the second slide 514.

[0042] By turning the lead screw with knob 512, the first slide 513 and the second slide 514 can be moved closer or further apart synchronously, making operation convenient.

[0043] It is understood that in some other embodiments, bolt limiting, elongated hole limiting plates, or other methods can be used to drive the movement of the first slide block 513 and the second slide block 514.

[0044] Based on the above embodiments, the mounting assembly 1 is provided with a braking mechanism 6, which is used to fix the lead screw 511 by applying a fiber to it.

[0045] After the first slide block 513 and the second slide block 514 are moved closer or further apart by rotating the lead screw 511, thereby adjusting the gap between the first extrusion unit 21 and the second extrusion unit 22, the brake mechanism 6 is used to fix the lead screw to prevent the lead screw from loosening and causing the gap between the first extrusion unit 21 and the second extrusion unit 22 to change.

[0046] Based on the above embodiments, such as Figure 5 As shown, the braking mechanism 6 includes a fixing block 61 and a set screw 62. The fixing block 61 is fixedly installed on the outer side wall of the mounting assembly 1. The fixing block 61 has a through hole that passes through the fixing block 61. The lead screw 511 passes through the fixing block 61 through the through hole. The fixing block 61 is also provided with a limiting hole. The limiting hole and the through hole are distributed in a T-shape. The set screw 62 is threaded in the limiting hole and can abut against the lead screw 511.

[0047] After the lead screw 511 is adjusted, rotate the set screw 62 so that the set screw 62 abuts against the lead screw 511. The friction between the set screw 62 and the lead screw 511 is used to fix the lead screw 511 and prevent the lead screw 511 from rotating.

[0048] Based on the above embodiments, the first extrusion unit 21 and the second extrusion unit 22 are both composed of multiple extrusion components. The first mounting bracket 52 and the second mounting bracket 53 are provided with multiple mounting holes that are evenly spaced along the vertical direction. The multiple extrusion components are connected to the first mounting bracket 52 or the second mounting bracket 53 through the corresponding mounting holes.

[0049] The extrusion component can be a roller, with a rolling bearing at its end. The extrusion component is rotatably connected to the mounting hole via the rolling bearing. During the extrusion process, the extrusion component rotates as the strip bag moves downwards, effectively reducing friction between the strip bag and the extrusion component, which helps to better ensure the appearance quality of the strip bag. In the embodiments of this application, the first extrusion unit 21 and the second extrusion unit 22 have three sets of extrusion components, thereby ensuring that the strip bag meets the minimum requirements in the rolling area of ​​the first extrusion unit 21 and the second extrusion unit 22, preventing the rolling area from being too narrow and thus reducing the exhaust effect.

[0050] It is understood that in some other embodiments, depending on the length of the strip bag, different numbers of extrusion members can be installed on the first mounting bracket 52 and the second mounting bracket 53, such as one set, two sets, four sets, five sets of extrusion members, etc.

[0051] In summary, the filling and venting device of the strip bag packaging machine of this application expels air from the strip bag by squeezing, avoiding impact on the strip bag during the venting process, thereby preventing liquid trapping and cracking of the strip bag sealing surface. It should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0052] The filling and exhaust device for the strip bag packaging machine provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A filling and venting device for a strip bag packaging machine, located below the horizontal sealing mechanism of the packaging machine, and used to vent air from inside the strip bag, characterized in that... The filling and exhaust device of the strip bag packaging machine includes: Mounting component (1), the mounting component (1) having a mounting slot; The exhaust assembly (2) includes a first extrusion unit (21) and a second extrusion unit (22). The first extrusion unit (21) and the second extrusion unit (22) are both disposed in the assembly groove and are rotatably connected to the mounting assembly (1). The first extrusion unit (21) and the second extrusion unit (22) are spaced apart along a first direction. There is a gap between the first extrusion unit (21) and the second extrusion unit (22) to facilitate the passage of the strip bag. When the strip bag passes through, the first extrusion unit (21) and the second extrusion unit (22) can squeeze the strip bag to expel the air inside the strip bag.

2. The filling and venting device for a strip bag packaging machine according to claim 1, characterized in that, The mounting component (1) is provided with a dynamic balancing component (3). The mounting component (1) is connected to the horizontal sealing mechanism of the packaging machine through the dynamic balancing component (3). The dynamic balancing component (3) is used to ensure that the mounting component (1) remains stationary when the horizontal sealing mechanism of the packaging machine moves.

3. The filling and venting device for a strip bag packaging machine according to claim 2, characterized in that, The dynamic balancing component (3) includes a fixed plate (31), a connecting shaft (32), and a connecting block (33). Both fixed plates (31) are slidably engaged with the connecting shaft (32), and the two are spaced apart along the axial direction of the connecting shaft (32). The two fixed plates (31) are connected to the horizontal sealing mechanism of the packaging machine. The two fixed plates (31) can move towards each other or away from each other under the drive of the horizontal sealing mechanism of the packaging machine. The connecting block (33) is provided on the mounting component (1) and is located between the two fixed plates (31). The connecting block (33) is fixedly connected to the connecting shaft (32).

4. The filling and venting device for a strip bag packaging machine according to claim 3, characterized in that, The mounting assembly (1) is provided with a limiting mechanism (4) to ensure that the connecting block (33) is located at the midpoint of the two fixing plates (31).

5. The filling and venting device for a strip bag packaging machine according to claim 4, characterized in that, The limiting mechanism (4) includes two first limiting members (41) and two second limiting members (42). The two first limiting members (41) are respectively disposed at both ends of the connecting shaft (32). The two first limiting members (41) can abut against the two fixed plates (31) respectively. The two second limiting members (42) are respectively installed on the inner side of the two fixed plates (31). The second limiting members (42) can abut against the connecting block (33).

6. The filling and venting device for a strip bag packaging machine according to claim 1, characterized in that, The mounting assembly (1) is provided with an adjustment assembly (5), which includes a motion mechanism (51), a first mounting bracket (52) and a second mounting bracket (53). The first pressing unit (21) is connected to the first mounting bracket (52), and the second pressing unit (22) is connected to the second mounting bracket (53). The motion mechanism (51) is provided on the mounting assembly (1) and is used to drive the first mounting bracket (52) and the second mounting bracket (53) to move towards each other or away from each other, thereby changing the gap between the first pressing unit (21) and the second pressing unit (22).

7. The filling and venting device for a strip bag packaging machine according to claim 6, characterized in that, The motion mechanism (51) includes a lead screw (511), a knob (512), a first slide (513), and a second slide (514). The lead screw (511) is rotatably fitted on the mounting assembly (1). The knob (512) is located at the end of the lead screw (511). The lead screw (511) has two threads with opposite directions. The first slide (513) and the second slide (514) are threadedly fitted with the two threads respectively. The first slide (513) is connected to the first mounting bracket (52), and the second slide (514) is connected to the second mounting bracket (53).

8. The filling and venting device for a strip bag packaging machine according to claim 7, characterized in that, The mounting assembly (1) is provided with a braking mechanism (6), which can limit the lead screw (511) and thus fix the lead screw (511).

9. The filling and venting device for a strip bag packaging machine according to claim 8, characterized in that, The braking mechanism (6) includes a fixing block (61) and a set screw (62). The fixing block (61) is disposed on the mounting assembly (1). The fixing block (61) is provided with a through hole and a limiting hole. The through hole passes through both ends of the fixing block (61). The limiting hole and the through hole are distributed in a T-shape. The lead screw (511) passes through the fixing block (61) through the through hole. The set screw (62) is disposed in the limiting hole. The set screw (62) can abut against the lead screw (511) to fix the lead screw (511).

10. The bag-on-tape packaging machine filling and venting device of claim 9, wherein, Both the first extrusion unit (21) and the second extrusion unit (22) are composed of multiple extrusion components. Both the first mounting bracket (52) and the second mounting bracket (53) are provided with multiple mounting holes spaced apart along the second direction. The multiple extrusion components are connected to the first mounting bracket (52) or the second mounting bracket (53) through the corresponding mounting holes.

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