Feeding mechanism for aluminum foil bag production

Abstract

The utility model provides a feeding mechanism for aluminum foil bag production. The feeding mechanism comprises a base, a feeding unit and an unwinding unit, wherein the feeding unit and the unwinding unit are arranged on the base. The unwinding unit comprises two unwinding assemblies which are sequentially arranged front and back, and the unwinding assemblies can alternately unwind aluminum foil; the unwinding assembly comprises supporting plates, a first driving piece, a first unwinding half shaft arranged on one supporting plate and a second unwinding half shaft arranged on the other supporting plate. The feeding unit comprises a second driving piece arranged on the base, a third driving piece arranged on the second driving piece and a supporting base arranged on the third driving piece. According to the feeding mechanism for aluminum foil bag production, the unwinding unit comprises the two unwinding assemblies, the two unwinding assemblies alternately unwind aluminum foil, when aluminum foil roll materials need to be replaced, shutdown operation is not needed, production efficiency can be improved, automatic feeding of the aluminum foil roll materials can be conveniently achieved through the feeding unit, and production efficiency is improved. And the labor intensity of workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum foil bag production, in particular to a feeding mechanism for aluminum foil bag production. Background Art

[0002] Aluminum foil bags are also called pure aluminum bags. Aluminum foil bag packaging usually refers to aluminum-plastic composite vacuum packaging bags. This type of product is suitable for moisture-proof, light-proof, and vacuum packaging of large-scale precision machinery and equipment, chemical raw materials, and pharmaceutical intermediates. When producing and processing aluminum foil bags, a feeding mechanism is generally required to supply aluminum foil to the aluminum foil bag forming equipment. However, during the production process, when replacing the aluminum foil roll, the existing feeding mechanism needs to stop the machine to replace the roll, which affects the further improvement of production efficiency. In addition, the operation is relatively complicated during the process of replacing the aluminum foil roll, which also increases the labor intensity of employees. Utility Model Content

[0003] In view of this, the utility model aims to provide a feeding mechanism for aluminum foil bag production, so as to improve production efficiency.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A feeding mechanism for aluminum foil bag production, used for supplying aluminum foil to an aluminum foil bag production device, comprises a base, and a feeding unit and an unwinding unit arranged on the base;

[0006] The unwinding unit comprises two unwinding assemblies arranged in sequence front and back, and each of the unwinding assemblies can alternately unwind the aluminum foil;

[0007] The unwinding assembly includes two support plates arranged on the base and opposite to each other, a first driving member for driving the two support plates to move left and right respectively, a first unwinding half shaft arranged on one of the support plates, and a second unwinding half shaft arranged on the other support plate;

[0008] The loading unit includes a second driving member arranged on the base, a third driving member arranged on the second driving member, and a support seat arranged on the third driving member. The second driving member can drive the second driving member to move forward and backward, and the third driving member can drive the support seat to move up and down.

[0009] Furthermore, one of the first unwinding half-shaft and the second unwinding half-shaft is provided with a slot, and the other of the first unwinding half-shaft and the second unwinding half-shaft is provided with a plug inserted into the slot, and the first unwinding half-shaft and the second unwinding half-shaft are transmission-connected via the plug and the slot;

[0010] One of the support plates of the unwinding assembly is provided with a fourth driving member, and the fourth driving member can drive the first unwinding half shaft or the second unwinding half shaft to rotate.

[0011] Furthermore, it also includes a joining unit arranged behind the unwinding unit, and the joining unit is used to join the aluminum foils unwound by two unwinding units;

[0012] The joining unit comprises a fifth driving member and a sixth driving member disposed on the base, a tape connection platform disposed on the fifth driving member, and a hot melt pressure head disposed on the sixth driving member;

[0013] The fifth driving member is used to drive the tape connection platform to move up and down, and the sixth driving member is used to drive the hot melt pressure head to move up and down.

[0014] Furthermore, it also includes a supporting unit arranged in front of the joining unit, and a clamping unit arranged behind the joining unit;

[0015] The support unit comprises two first support rollers arranged at an interval in an upper and lower manner, wherein the first support roller located at the upper portion is used to support the aluminum foil unwound by the unwound assembly located at the front of the two unwound assemblies, and the first support roller located at the lower portion is used to support the aluminum foil unwound by the unwound assembly located at the rear of the two unwound assemblies;

[0016] The clamping unit comprises an upper clamping assembly and a lower clamping assembly, wherein the upper clamping assembly comprises an upper fixed plate and an upper movable plate slidably arranged on the base in the up-down direction, and as the upper movable plate is driven to move, the aluminum foil unwound by the unwound assembly closer to the front of the two unwound assemblies can be clamped or released by the upper clamping assembly;

[0017] The lower clamping assembly includes a lower fixed plate and a lower movable plate slidably arranged on the base along the up and down directions. As the lower movable plate is driven to move, the aluminum foil unwound by the rear unwound assembly of the two unwound assemblies can be clamped by the lower clamping assembly.

[0018] Furthermore, a first transmission assembly is connected between the hot melt pressure head and the upper movable plate, and the hot melt pressure head drives the upper movable plate to move up and down through the first transmission assembly;

[0019] A second transmission assembly is connected between the belt connecting platform and the lower movable plate, and the belt connecting platform drives the lower movable plate to move up and down through the second transmission assembly.

[0020] Furthermore, a mounting rod is provided on the base, and the first transmission assembly includes a first connecting rod rotatably provided on the mounting rod, and a second connecting rod hinged between the first connecting rod and the upper movable plate;

[0021] The first connecting rod is provided with a long hole extending along the length direction of the first connecting rod, and the hot melt pressure head is provided with a connecting column penetrating the long hole;

[0022] The second transmission assembly has the same structure as the first transmission assembly.

[0023] Furthermore, it also includes a tensioning unit arranged behind the clamping unit;

[0024] The tensioning unit includes a second supporting roller and a third supporting roller which are arranged in a front-to-back manner and a tensioning roller arranged between the second supporting roller and the third supporting roller, and the tensioning roller is slidably arranged on the base along the up-down direction.

[0025] Compared with the prior art, the utility model has the following advantages:

[0026] The utility model discloses a feeding mechanism for producing aluminum foil bags. The unwinding unit includes two unwinding components, and the two unwinding components unwind the aluminum foil alternately. When one unwinding component needs to replace the aluminum foil coil, the other unwinding component can continue to unwind the aluminum foil strip without stopping the machine, which is conducive to improving production efficiency. In addition, by providing a feeding unit and a first driving member, after the aluminum foil coil is placed on the support seat, it is convenient to realize automatic feeding of the aluminum foil coil, which is conducive to reducing the labor intensity of employees.

[0027] In addition, by providing a clamping unit, the end position of the aluminum foil roll that is not involved in the unwinding work can be clamped at the position of the clamping unit in advance. When the unwinding assembly needs to be replaced for unwinding work, the clamping unit can release the clamping of the aluminum foil strip, thereby facilitating the joining operation of the aluminum foil strip and helping to further improve production efficiency.

[0028] In addition, the upper movable plate is driven to move by the hot melt pressure head, and the lower movable plate is driven to move by the belt connection platform. There is no need to set up a driving member that separately drives the upper movable plate and the lower movable plate to move, which helps to reduce equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0030] Figure 1 This is a structural schematic diagram of a feeding mechanism for producing aluminum foil bags according to an embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of a feeding mechanism for producing aluminum foil bags according to an embodiment of the utility model in operation;

[0032] Figure 3 It is a partial structural schematic diagram of the unwinding assembly according to an embodiment of the utility model;

[0033] Figure 4 This is a schematic structural diagram of the support plate and the first unwinding half shaft according to an embodiment of the utility model;

[0034] Figure 5 This is a schematic structural diagram of the support plate and the second unwinding half shaft according to an embodiment of the utility model;

[0035] Figure 6 It is a structural schematic diagram of the joining unit and the pressing unit according to an embodiment of the utility model;

[0036] Figure 7 This is a schematic diagram of the installation structure of the tensioning roller described in an embodiment of the utility model.

[0037] Description of reference numerals:

[0038] 1. Base; 2. Unwinding assembly; 201. Support plate; 202. First driving member; 203. First unwinding semi-axis; 204. Second unwinding semi-axis; 3. Second driving member; 4. Third driving member; 5. Support seat; 6. Slot; 7. Insert column; 8. Fifth driving member; 9. Tape connection platform; 10. Hot melt pressure head; 11. First support roller; 12. Upper movable plate; 13. Upper fixed plate; 14. Lower movable plate; 15. Lower fixed plate; 16. Mounting rod; 17. First connecting rod; 1701. Long strip hole; 18. Second connecting rod; 19. Connecting column; 20. Second support roller; 21. Third support roller; 22. Tensioning roller; 23. Slide groove; 24. Sliding block; 25. Sixth driving member; 26. Aluminum foil roll. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0040] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] This embodiment relates to a feeding mechanism for aluminum foil bag production, which is used to supply aluminum foil to an aluminum foil bag production device. The overall structure is as follows: Figure 1 and Figure 2 As shown in , the feeding mechanism for aluminum foil bag production includes a base 1, and a feeding unit and an unwinding unit arranged on the base 1. The unwinding unit includes two unwinding assemblies 2 arranged in sequence front and back, and each unwinding assembly 2 can unwind aluminum foil alternately. The unwinding assembly 2 includes two support plates 201 arranged on the base 1 and arranged opposite to each other, a first driving member 202 that drives the two support plates 201 to move left and right respectively, a first unwinding semi-axis 203 arranged on one of the support plates 201, and a second unwinding semi-axis 204 arranged on the other support plate 201.

[0044] The loading unit includes a second driving member 3 arranged on the base 1, a third driving member 4 arranged on the second driving member 3, and a support seat 5 arranged on the third driving member 4. The second driving member 3 can drive the second driving member 3 to move forward and backward, and the third driving member 4 can drive the support seat 5 to move up and down. It can be understood that in this embodiment, by making the unwinding unit include two unwinding components 2, and making the two unwinding components 2 alternately unwind aluminum foil, when one of the unwinding components 2 needs to replace the aluminum foil coil, the other unwinding component 2 continues to unwind the aluminum foil strip, without the need to stop the machine, which is conducive to improving production efficiency. And by setting the loading unit and providing the first driving member 202, after the aluminum foil roll 26 is placed on the support seat 5, it is convenient to realize the automatic loading of the aluminum foil roll 26, which is conducive to reducing the labor intensity of employees.

[0045] It should be noted that the first driving member 202 and the second driving member 3 can both be linear modules commonly used in the prior art, and the third driving member 4 can be a servo electric cylinder commonly used in the prior art, which will not be described in detail here.

[0046] Based on the above overall introduction, as a preferred implementation method, Figure 3 , Figure 4 and Figure 5As shown in , in this embodiment, one of the first unwinding semi-shaft 203 and the second unwinding semi-shaft 204 is provided with a slot 6, and the other of the first unwinding semi-shaft 203 and the second unwinding semi-shaft 204 is provided with a plug 7 inserted into the slot 6, and the first unwinding semi-shaft 203 and the second unwinding semi-shaft 204 are connected by transmission through the plug 7 and the slot 6. One of the support plates 201 of the unwinding assembly 2 is provided with a fourth driving member, and the fourth driving member can drive the first unwinding semi-shaft 203 or the second unwinding semi-shaft 204 to rotate.

[0047] When replacing the aluminum foil roll 26, after the third driving member 4 raises the aluminum foil roll 26 to a suitable height, the second driving member 3 can drive the first unwinding half-shaft 203 and the second unwinding half-shaft 204 to approach each other and pass through the aluminum foil roll 26, thereby supporting the aluminum foil roll 26 through the first unwinding half-shaft 203 and the second unwinding half-shaft 204. During this process, in order to facilitate the insertion of the column 7 into the slot 6, marks can be set on the first unwinding half-shaft 203 and the second unwinding half-shaft 204. When the two marks are in the same position, it indicates that the column 7 can be inserted into the slot 6.

[0048] In addition, as a preferred embodiment, the feeding mechanism for producing aluminum foil bags further comprises a joining unit arranged behind the unwinding unit, and the joining unit is used to join the aluminum foil unwinded by the two unwinding units. The joining unit comprises an upper fifth driving member 8 and a sixth driving member 25 arranged on the base 1, a tape splicing platform 9 arranged on the fifth driving member 8, and a hot melt pressing head 10 arranged on the sixth driving member 25. The fifth driving member 8 is used to drive the tape splicing platform 9 to move up and down, and the sixth driving member 25 is used to drive the hot melt pressing head 10 to move up and down.

[0049] By providing the joining unit, when replacing the unwinding mechanism to unwind the aluminum foil, there is no need to re-thread the tape, which is conducive to further reducing the labor intensity of remote operation. The structures of the above-mentioned tape connection platform 9 and the hot melt pressure head 10 can be set with reference to the structure of the hot melt connection device commonly used in the prior art, and will not be described in detail here. In addition, the above-mentioned fifth driving member 8 and the sixth driving member 25 can be selected from servo electric cylinders or air cylinders commonly used in the prior art.

[0050] In addition, if Figure 1 As shown in , as a preferred embodiment, the feeding mechanism for aluminum foil bag production further includes a support unit arranged in front of the joining unit, and a clamping unit arranged behind the joining unit. The support unit includes two first support rollers 11 arranged in an upper and lower interval, the upper first support roller 11 is used to support the aluminum foil unwound by the unwound assembly 2 closer to the front of the two unwound assemblies 2, and the lower first support roller 11 is used to support the aluminum foil unwound by the unwound assembly 2 closer to the rear of the two unwound assemblies 2.

[0051] The clamping unit includes an upper clamping assembly and a lower clamping assembly. The upper clamping assembly includes an upper fixed plate 13 and an upper movable plate 12 slidably arranged on the base 1 in the up-down direction. As the upper movable plate 12 is driven to move, the aluminum foil unwound by the unwound assembly 2 closer to the front of the two unwound assemblies 2 can be clamped or loosened by the upper clamping assembly. The lower clamping assembly includes a lower fixed plate 15 and a lower movable plate 14 slidably arranged on the base 1 in the up-down direction. As the lower movable plate 14 is driven to move, the aluminum foil unwound by the unwound assembly 2 closer to the back of the two unwound assemblies 2 can be clamped by the lower clamping assembly.

[0052] By providing a support unit, it is convenient to make the aluminum foil strip move along a preset track. By providing a clamping unit, the end position of the aluminum foil roll 26 that is not involved in the unwinding work can be clamped at the position of the clamping unit in advance. When the unwinding assembly 2 needs to be replaced for unwinding work, the clamping unit can be made to loosen the clamping of the aluminum foil strip, thereby facilitating the joining operation of the aluminum foil strip, which is conducive to further improving production efficiency.

[0053] As a preferred implementation method, Figure 6 As shown in , a first transmission assembly is connected between the hot melt pressure head 10 and the upper movable plate 12, and the hot melt pressure head 10 drives the upper movable plate 12 to move up and down through the first transmission assembly. A second transmission assembly is connected between the tape connection platform 9 and the lower movable plate 14, and the tape connection platform 9 drives the lower movable plate 14 to move up and down through the second transmission assembly. It can be understood that by driving the upper movable plate 12 to move by the hot melt pressure head 10, and driving the lower movable plate 14 to move by the tape connection platform 9, there is no need to set a separate driving member for driving the upper movable plate 12 and the lower movable plate 14 to move, which is conducive to reducing equipment costs.

[0054] like Figure 6 As shown in , as a preferred embodiment, a mounting rod 16 is provided on the base 1, and the first transmission assembly includes a first connecting rod 17 rotatably provided on the mounting rod 16, and a second connecting rod 18 hinged between the first connecting rod 17 and the upper movable plate 12. The first connecting rod 17 is provided with an elongated hole 1701 extending along the length direction of the first connecting rod 17, and the hot melt pressure head 10 is provided with a connecting column 19 penetrating the elongated hole 1701. Such a configuration has a simple structure and is convenient for arrangement. The structure of the second transmission assembly is the same as that of the first transmission assembly, and will not be described in detail here.

[0055] As a preferred embodiment, the feeding mechanism for aluminum foil bag production further includes a tensioning unit arranged behind the clamping unit. The tensioning unit includes a second support roller 20 and a third support roller 21 arranged in a front-to-back spacing, and a tensioning roller 22 arranged between the second support roller 20 and the third support roller 21, and the tensioning roller 22 is slidably arranged on the base 1 in the up-down direction. In specific implementation, Figure 7As shown in , a slide groove 23 may be provided on the base 1, and a slider 24 may be slidably provided in the slide groove 23, and a tensioning roller 22 may be provided on the slide. When the tension of the aluminum foil strip is large, the tensioning roller 22 may rise under the action of the aluminum foil strip, thereby reducing the tension. When the tension of the aluminum foil strip is small, the tensioning roller 22 may fall under the action of its own gravity, thereby increasing the tension.

[0056] In this embodiment, the working principle of the feeding mechanism for producing aluminum foil bags is described by taking the working condition of the unwinding assembly 2 at the rear as an example. Figure 2 As shown in the figure, the aluminum foil strip unwound by the unwinding assembly 2 passes through the first support roller 11, the joining unit and the clamping unit, and then passes through the second support roller 20, the tensioning roller 22 and the second support roller 20 in sequence to be transferred backward. After the aluminum foil roll 26 on the unwinding assembly 2 is used up, it can be replaced with another unwinding assembly 2 to unwind the aluminum foil strip, and the strip platform is driven to move upward by the fifth driving member 8, and the hot melt pressure head 10 is driven to move downward by the sixth driving member 25 to complete the joining of the new and old strips.

[0057] In addition, when replacing a new roll of material, the two support plates 201 can be driven away from each other by the first driving member 202. Thereafter, the new roll of material placed on the support seat 5 is moved to the position of the unwinding assembly 2 by the second driving member 3, and after the roll of material is raised to a suitable height by the third driving member 4, the two support plates 201 can be brought closer to each other by the first driving member 202, and the first unwinding half shaft 203 and the second unwinding half shaft 204 can be inserted into the roll of material, and the plug 7 can be inserted into the slot 6.

[0058] The feeding mechanism for producing aluminum foil bags of this embodiment has two unwinding components 2 in the unwinding unit, and the two unwinding components 2 unwind the aluminum foil alternately. When one unwinding component 2 is replacing the aluminum foil coil, the other unwinding component 2 continues to unwind the aluminum foil strip without stopping the machine, which is conducive to improving production efficiency. In addition, by providing a feeding unit and a second driving member 3, after the aluminum foil roll 26 is placed on the support seat 5, it is convenient to realize automatic feeding of the aluminum foil roll 26, which is conducive to reducing the labor intensity of employees.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A feeding mechanism for aluminum foil bag production, used for supplying aluminum foil to an aluminum foil bag production device, characterized by: It comprises a base (1), and a loading unit and an unwinding unit arranged on the base (1); The unwinding unit comprises two unwinding assemblies (2) arranged in sequence front to back, and each of the unwinding assemblies (2) is capable of alternately unwinding aluminum foil; The unwinding assembly (2) comprises two support plates (201) disposed on the base (1) and arranged opposite to each other, a first driving member (202) for driving the two support plates (201) to move left and right respectively, a first unwinding half-shaft (203) disposed on one of the support plates (201), and a second unwinding half-shaft (204) disposed on the other support plate (201); The loading unit comprises a second driving member (3) arranged on the base (1), a third driving member (4) arranged on the second driving member (3), and a support base (5) arranged on the third driving member (4), wherein the second driving member (3) is capable of driving the second driving member (3) to move forward and backward, and the third driving member (4) is capable of driving the support base (5) to move up and down.

2. The feeding mechanism for aluminum foil bag production according to claim 1 is characterized in that: One of the first unwinding half-shaft (203) and the second unwinding half-shaft (204) is provided with a slot (6), and the other of the two is provided with an insertion column (7) inserted into the slot (6), and the first unwinding half-shaft (203) and the second unwinding half-shaft (204) are transmission-connected via the insertion column (7) and the slot (6); One of the support plates (201) of the unwinding assembly (2) is provided with a fourth driving member, and the fourth driving member is capable of driving the first unwinding half-shaft (203) or the second unwinding half-shaft (204) to rotate.

3. The feeding mechanism for aluminum foil bag production according to claim 1 is characterized in that: It also includes a joining unit arranged behind the unwinding unit, and the joining unit is used to join the aluminum foils unwound by two unwinding units; The joining unit comprises a fifth driving member (8) and a sixth driving member (25) arranged on the base (1), a tape connection platform (9) arranged on the fifth driving member (8), and a hot melt pressure head (10) arranged on the sixth driving member (25); The fifth driving member (8) is used to drive the tape connection platform (9) to move up and down, and the sixth driving member (25) is used to drive the hot melt pressure head (10) to move up and down.

4. The feeding mechanism for aluminum foil bag production according to claim 3 is characterized in that: It also includes a supporting unit disposed in front of the joining unit, and a clamping unit disposed behind the joining unit; The support unit comprises two first support rollers (11) arranged at an interval up and down, the first support roller (11) located at the top being used to support the aluminum foil unwound by the unwound assembly (2) located at the front of the two unwound assemblies (2), and the first support roller (11) located at the bottom being used to support the aluminum foil unwound by the unwound assembly (2) located at the rear of the two unwound assemblies (2); The clamping unit comprises an upper clamping assembly and a lower clamping assembly, the upper clamping assembly comprising an upper fixed plate (13) and an upper movable plate (12) slidably arranged on the base (1) in an up-down direction, and as the upper movable plate (12) is driven to move, the aluminum foil unwound by the unwound assembly (2) closer to the front of the two unwound assemblies (2) can be clamped or released by the upper clamping assembly; The lower clamping assembly comprises a lower fixed plate (15) and a lower movable plate (14) slidably arranged on the base (1) in an up-down direction. As the lower movable plate (14) is driven to move, the aluminum foil unwound by the rear unwound assembly (2) of the two unwound assemblies (2) can be clamped by the lower clamping assembly.

5. The feeding mechanism for aluminum foil bag production according to claim 4 is characterized in that: A first transmission component is connected between the hot melt pressure head (10) and the upper movable plate (12), and the hot melt pressure head (10) drives the upper movable plate (12) to move up and down through the first transmission component; A second transmission component is connected between the belt connection platform (9) and the lower movable plate (14), and the belt connection platform (9) drives the lower movable plate (14) to move up and down through the second transmission component.

6. The feeding mechanism for producing aluminum foil bags according to claim 5, characterized in that: The base (1) is provided with a mounting rod (16), and the first transmission assembly comprises a first connecting rod (17) rotatably arranged on the mounting rod (16), and a second connecting rod (18) hinged between the first connecting rod (17) and the upper movable plate (12); The first connecting rod (17) is provided with a long hole (1701) extending along the length direction of the first connecting rod (17), and the hot melt pressure head (10) is provided with a connecting column (19) penetrating the long hole (1701); The second transmission assembly has the same structure as the first transmission assembly.

7. The feeding mechanism for producing aluminum foil bags according to claim 5, characterized in that: Also includes a tensioning unit disposed behind the clamping unit; The tensioning unit comprises a second support roller (20) and a third support roller (21) which are arranged in a front-to-back manner with a spacing therebetween, and a tensioning roller (22) arranged between the second support roller (20) and the third support roller (21), and the tensioning roller (22) is slidably arranged on the base (1) along the up-down direction.

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