Die-cutting and shaking integrated machine for power battery protection sheet

Abstract

A die-cutting and shaking integrated machine for a power battery protection sheet, comprising: a die-cutting part (6) for cutting a fed sheet into slices; a pulling part (2), capable of conveying the sheet to the die-cutting part (6); and a post-waste shaking part, comprising a conveying belt platform (9) and a shaking device, wherein the shaking device can enable a conveying belt element (12) on the conveying belt platform to move up and down, and the conveying belt platform (9) can implement speed change to enable the sheet to perform vibration stepping. The integrated machine improves the degree of automation and waste can be shaken off more efficiently.

Description

Power battery protective sheet die-cutting and shaking machine Technical Field

[0001] The present invention relates to the technical field of die-cutting and shaking materials for protective sheets, and in particular to an all-in-one die-cutting and shaking material machine for power battery protective sheets. Background Art

[0002] The protective sheet for power batteries has excellent heat resistance and protective functions and is widely used in the safety protection of new energy battery packs. The protective sheet generally includes PET sheets, foam, protective film or mica sheets. In order to adapt to different size requirements during the production process, the sheet needs to be die-cut into different sizes.

[0003] In the prior art, when die-cutting power battery protective sheets, excess parts or hole parts will generate waste, affecting subsequent packaging and other processes. Technical issues

[0004] The present invention provides an all-in-one machine for die-cutting and shaking out power battery protective sheets, which realizes die-cutting, conveying and shaking out of power battery protective sheets, improves the degree of automation, reduces working hours, improves efficiency, and can shake out waste more efficiently. Technical Solutions

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Power battery protective sheet die-cutting and shaking all-in-one machine, including:

[0007] The die-cutting section slices the fed sheet; the pulling section can convey the sheet to the die-cutting section; the post-waste shaking section includes a conveyor belt platform and a shaking device, the shaking device can make the conveyor belt elements on the conveyor platform rise and fall, and the conveyor belt platform can change speed to make the sheet vibrate and step.

[0008] Optionally, the pulling part includes a frame, which is equipped with two sets of feeding components, and the feeding components include two pressing cylinders installed on the top of the frame, and the output ends of the pressing cylinders are both equipped with bearing seats, and the bearing seats are slidably installed on the frame. A pulling roller is rotatably installed between the two bearing seats, and a servo motor for controlling the rotation of the pulling roller is installed on the outer wall of the frame, and a front laminating roller cooperating with the pulling roller is installed on the frame.

[0009] Optionally, the die-cutting section includes a machine table, a die-cutting table is fixedly installed on the top of the machine table, two guide rollers are installed in the internal space of the die-cutting table, the guide rollers are engaged with the pulling part, the two guide rollers guide the fed sheet, and a servo-controlled cutter is installed inside the die-cutting table.

[0010] Optionally, the conveyor belt platform includes two platform frames, two transmission rollers are installed between the two platform frames, a plurality of equidistantly distributed assembly grooves are opened on the two transmission rollers, and a plurality of assembly belts are connected between the two transmission rollers through the plurality of assembly grooves, including a driver for controlling the speed change of the transmission rollers.

[0011] Optionally, the material shaking device includes a main shaft rotatably mounted between two platform frames, and the main shaft is located in the middle of the area surrounded by the assembly belt, the vertical distance between the main shaft and the highest point is equal to the vertical distance between the highest point and the lowest point, and a dividing frame is fixedly mounted on the outer wall of the main shaft, and a plurality of first assembly rods are rotatably mounted on the end of the circular array of the dividing frame, and the distance between the first assembly rod and the main shaft is greater than the vertical distance between the main shaft and the highest point of the assembly belt, and a power motor for controlling the rotation of the main shaft is mounted on the outer wall of the platform frame.

[0012] Optionally, the driver includes a conveying motor installed on the outer wall of the platform frame, and the conveying motor can control one of the transmission rollers to change the rotation speed.

[0013] Optionally, the material shaking device includes a swing arm coaxially hinged with the transmission roller, a second assembly rod is rotatably installed on the outer wall of the swing arm, the second assembly rod is inserted into the surrounding area of ​​the assembly belt, a friction cam is rotatably installed on the outer wall of the platform frame through a bearing seat, a uniform speed motor for controlling the rotation of the friction cam is installed on the platform frame, a friction disk is rotatably installed on the outer wall of the swing arm, friction transmission is between the friction cam and the friction disk, the area where the friction cam and the friction disk rub against each other is elliptical, and the swing arm is in a horizontal state when the long axis of the friction cam remains horizontal.

[0014] Optionally, the driver includes a conveying gear installed on the outer wall of the platform frame, the conveying gear rotates coaxially with the transmission roller, the swing arm rotates along the conveying gear, the outer wall of the swing arm is rotated with a dynamic gear installed, the swing arm rotates coaxially with the friction disk, the dynamic gear is meshed and connected with the conveying gear, and when the swing arm rotates, the dynamic gear revolves along the outer wall of the conveying gear.

[0015] Optionally, a friction groove is provided on the friction cam, and a friction flange is provided on the outer wall of the friction disc, and the friction flange is in transmission engagement with the friction groove.

[0016] Optionally, a scraper is hinged between the two platform frames via a damping hinge, the scraper is located below the assembly belt, and the end of the scraper is in conflict with the outer wall of the assembly belt. Beneficial effects

[0017] The present invention provides a power battery protective sheet die-cutting and shaking machine. By arranging a rear waste shaking part, the conveyor belt element on the conveyor platform can rise and fall, so that the die-cutting waste attached to the top of the protective sheet or its outer wall can be shaken off. At the same time, the conveyor belt platform can perform variable speed transportation. In the process of the conveyor belt changing from slow to fast speed, the quality of the protective sheet is not enough to overcome the acceleration phenomenon, which will cause the protective sheet to slip in the process of changing from slow to fast speed. During the slipping process, the protective sheet cooperates with the up and down rise and fall of the conveyor belt, so that the waste brought by the die-cutting process can be better and more effectively cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of a three-dimensional structure of the present invention equipped with embodiment 1;

[0019] FIG2 is a front view schematic diagram of the structure of FIG1 of the present invention;

[0020] FIG3 is a schematic structural diagram of a material shaking device and a conveyor belt platform in Embodiment 1 of the present invention;

[0021] FIG4 is a schematic diagram of a three-dimensional structure of the present invention equipped with Example 2;

[0022] FIG5 is a schematic diagram of the internal structure of the die-cutting portion of the present invention and an isolated diagram of the overall structure;

[0023] FIG6 is a schematic structural diagram of a material shaking device and a conveyor belt platform in a second embodiment of the present invention;

[0024] FIG7 is a schematic diagram of the specific structure of the material shaking device in the second embodiment of the present invention.

[0025] In the figure: 1. Frame; 2. Pulling roller; 3. Pressing cylinder; 4. Bearing seat; 5. Machine table; 6. Die-cutting table; 7. Guide roller; 8. Cutter; 9. Platform frame; 11. Drive roller; 12. Assembly belt; 13. Assembly groove; 14. First assembly rod; 15. Spindle; 16. Indexing frame; 17. Swing arm; 18. Conveyor gear; 19. Dynamic gear; 20. Scraper; 21. Second assembly rod; 24. Friction disc; 25. Friction cam. Best Mode for Carrying Out the Invention

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Referring to Figures 1 to 7, the present invention provides a power battery protective sheet die-cutting and shaking integrated machine, comprising:

[0028] The die-cutting section slices the fed sheet; the pulling section can convey the sheet to the die-cutting section; the post-waste shaking section includes a conveyor belt platform and a shaking device, the shaking device can make the conveyor belt elements on the conveyor platform rise and fall, and the conveyor belt platform can change speed to make the sheet vibrate and step.

[0029] In the prior art, after die-cutting PET, mica sheets or thermal insulation sheets, waste will be generated in the continuous die-cutting process due to the shape and size limitations of the die-cutting mold. With the rapid development of new energy power batteries, the demand for power battery protective sheets has increased. The existing manual waste removal will seriously affect production efficiency. In the present invention, by providing a rear waste shaking part, the conveyor belt elements on the conveying platform can rise and fall, so that the die-cutting waste attached to the top or outer wall of the protective sheet can be shaken off. At the same time, the variable speed conveying of the conveyor belt platform can cause the protective sheet to slip in the running direction.

[0030] Specifically, when the conveyor belt speeds up from slow to fast, the quality of the protective sheet is not enough to overcome the acceleration phenomenon, which will cause the protective sheet to slip during the process. During the slipping process, the protective sheet cooperates with the ups and downs of the conveyor belt, thereby effectively cleaning up the waste brought about by the die-cutting process.

[0031] The conveyor belt element in the present invention can be understood as the existing technology, and a more efficient conveyor belt element will be provided in the following technical solution.

[0032] In one of the more preferred embodiments, the drawing part includes a frame 1, on which two sets of feeding components are assembled, and the feeding components include two pressing cylinders 3 installed on the top of the frame 1, and the output ends of the pressing cylinders 3 are installed with bearing seats 4, and the bearing seats 4 are slidably installed on the frame 1. A drawing roller 2 is rotatably installed between the two bearing seats 4, and a servo motor for controlling the rotation of the drawing roller 2 is installed on the outer wall of the frame 1, and a front laminating roller that cooperates with the drawing roller 2 is installed on the frame 1. Please refer to Figures 1, 2, 4 and 5. In the specific implementation, it is necessary to The thickness of the sheet adjusts the feed gap, and in this embodiment, through the cooperation of the frame 1, the pressing cylinder 3 and the pulling roller 2, the pulling roller 2 can be accurately lifted or lowered, thereby controlling the distance between the pulling roller 2 and the front laminating roller. In the field of power battery protective sheets, the maximum distance does not exceed fifty millimeters. Secondly, in this embodiment, by setting two sets of feeding components, the accuracy of pulling can be improved. At the same time, a digital pressure gauge associated with the pressing cylinder 3 is integrated on the outer wall of the frame 1, which is convenient for reading the pressure value and tight adjustment.

[0033] In one of the more preferred embodiments, the die-cutting section includes a machine table 5, a die-cutting table 6 is fixedly installed on the top of the machine table 5, two guide rollers 7 are installed in the internal space of the die-cutting table 6, the guide rollers 7 are connected with the pulling part, and the two guide rollers 7 guide the fed sheet. A servo-controlled cutter 8 is installed inside the die-cutting table 6, please refer to Figures 1, 2, 4 and 5. In the specific implementation, it is necessary to adjust and replace the appropriate cutter 8 according to the actual die-cutting situation. In this embodiment, the two guide rollers 7 can be connected with the pulling part to guide the sheet into the die-cutting area, and the servo-controlled cutter 8 is used to slice or die-cut the sheet. In the present invention, cutters 8 of other structures or forms are not shown.

[0034] In one of the more preferred embodiments, the conveyor belt platform includes two platform frames 9, two drive rollers 11 are installed between the two platform frames 9, and a plurality of equidistantly distributed assembly slots 13 are provided on the two drive rollers 11. A plurality of assembly belts 12 are connected between the two drive rollers 11 through a plurality of assembly slots 13, including a driver for controlling the speed change of the drive rollers 11, please refer to Figures 1 to 3. In a specific implementation, it is necessary to adjust the distance between two adjacent assembly slots 13 according to the thickness of the protective sheet to provide a material drop space for the shaking off of the protective sheet waste. Secondly, by providing the assembly slot 13, the contact area between the assembly belt 12 and the assembly slot 13 can be increased, thereby improving the conveying quality of the assembly slot 13. Secondly, since in the present invention, the assembly slot 13 will be controlled by the shaking device to rise and fall, the assembly slot 13 can also be provided to limit the assembly belt 12 to prevent it from deviating from the correct transmission path.

[0035] In this embodiment, the driving roller 11, the assembly belt 12 and the assembly groove 13 constitute a conveyor belt element.

[0036] The following provides two embodiments of material shaking devices, and provides different driver implementation schemes based on them. Example

[0037] The material shaking device includes a main shaft 15 rotatably installed between two platform frames 9, and the main shaft 15 is located in the middle of the area surrounded by the assembly belt 12. The vertical distance between the main shaft 15 and the highest point and the lowest point is equal. A dividing frame 16 is fixedly installed on the outer wall of the main shaft 15, and a plurality of first assembly rods 14 are rotatably installed at the end of the circular array of the dividing frame 16. The distance between the first assembly rod 14 and the main shaft 15 is greater than the vertical distance between the main shaft 15 and the highest point of the assembly belt 12. A power motor for controlling the rotation of the main shaft 15 is installed on the outer wall of the platform frame 9.

[0038] Please refer to Figures 1 to 3. In this embodiment, by configuring the position and size relationship between the main shaft 15 and the assembly belt 12, the main shaft 15 can be located in the center position inside the assembly belt 12. At the same time, due to the cooperation between the first assembly rod 14, the assembly belt 12 and the main shaft 15, the first assembly rod 14 can lift the assembly belt 12 to the highest point when it rotates to the highest point. Secondly, please refer to Figure 3. When the two adjacent ones at the top remain horizontal, the assembly belt 12 remains horizontal at this time. A plurality of first assembly rods 14 distributed in a circular array can sequentially lift the assembly belt 12 upward while the main shaft 15 rotates. In the process of the first assembly rods 14 alternately lifting the assembly belt 12, the assembly belt 12 relies on its own elasticity or the tension component configured on the conveyor belt element to achieve rapid rebound, so that the assembly belt 12 can rise and fall during operation, and shake off the waste generated by die-cutting.

[0039] Based on Example 1, a driver implementation scheme is provided. The driver includes a conveying motor installed on the outer wall of the platform frame 9. The conveying motor can control one of the transmission rollers 11 to change the speed. Please refer to Figures 1 to 3. In this embodiment, the conveying motor is a servo-adjustable motor. By installing the conveying motor, the installation structure can be reduced, and the transmission roller 11 can be directly servo-controlled. At the same time, the time spent on maintenance and inspection can be reduced, and real-time monitoring and management can be performed. Example

[0040] The material shaking device includes a swing arm 17 coaxially hinged with the transmission roller 11, and the outer wall of the swing arm 17 is rotatably installed with a second assembly rod 21, and the second assembly rod 21 penetrates into the surrounding area of ​​the assembly belt 12. The outer wall of the platform frame 9 is rotatably installed with a friction cam 25 through a bearing seat, and a uniform speed motor for controlling the rotation of the friction cam 25 is installed on the platform frame 9. The outer wall of the swing arm 17 is rotatably installed with a friction disk 24, and friction transmission is transmitted between the friction cam 25 and the friction disk 24. The area where the friction cam 25 and the friction disk 24 rub against each other is elliptical. When the long axis of the friction cam 25 remains horizontal, the swing arm 17 is in a horizontal state.

[0041] Please refer to Figures 3 to 7. In this embodiment, a limiting damping mechanism for the swing arm 17 is also included, which is not shown in the present invention. Its function is to reset the swing arm 17. Due to the structure and load of the swing arm 17 itself or under the restriction of the assembly belt 12, it can also be reset. The material shaking device in this embodiment cooperates with the contact friction transmission of the friction cam 25 and the friction disk 24. When the main shaft 15 rotates, the friction disk 24 can rotate synchronously. At the same time, when the friction cam 25 rotates, it can drive the friction disk 24 and its swing arm 17 to move upward, so that the second assembly rod 21 on the swing arm 17 can lift the assembly belt 12 upward, so that the assembly belt 12 can rise and fall, and complete the shaking off of the waste material.

[0042] Secondly, when the friction disc 24 is lifted up, the swing arm 17 will be under the elastic pressure of the assembly belt 12, and will rotate to the friction disc 24. At this time, the friction disc 24 will transfer the pressure to the friction cam 25, thereby increasing the transmission friction between the two, making the rotation of the friction disc 24 more stable. Driven by the uniform speed motor, the friction cam 25 can rotate at a uniform speed. However, due to the shape limitation of the friction cam 25, when the long axis of the friction cam 25 turns from a horizontal state to a vertical state, the friction surface stroke of the friction cam 25 will increase, so that the friction disc 24 will rotate the same stroke in this process, and the time is the same. At this time, the friction disc 24 will rotate at an accelerated speed. On the contrary, when the long axis of the friction cam 25 turns from a vertical state to a horizontal state, it will start to slowly turn to the initial speed, forming a closed-loop operation.

[0043] On the basis of Example 2, a drive implementation scheme is provided, which includes a conveying gear 18 installed on the outer wall of the platform frame 9. The conveying gear 18 rotates coaxially with the drive roller 11. The swing arm 17 rotates along the conveying gear 18. A dynamic gear 19 is installed on the outer wall of the swing arm 17. The swing arm 17 rotates coaxially with the friction disk 24. The dynamic gear 19 is meshed and connected with the conveying gear 18. When the swing arm 17 rotates, the dynamic gear 19 revolves along the outer wall of the conveying gear 18.

[0044] Please refer to Figures 6 and 7. In this embodiment, since the dynamic gear 19 and the friction disk 24 rotate coaxially, and the dynamic gear 19 and the swing arm 17 revolve together on the outer wall of the conveying gear 18, when the friction disk 24 is lifted up and accelerated, the dynamic gear 19 will revolve on the conveying gear 18. Due to the meshing transmission between the conveying gear 18 and the dynamic gear 19, the conveying gear 18 will be accelerated again, so that the conveying gear 18 can increase the rotation speed of the drive roller 11 in the process of the assembly belt 12 being lifted up, so that the assembly belt 12 can be accelerated, so that the protective sheet can be better shaken and conveyed forward, thereby improving the quality and efficiency of the waste shaking.

[0045] Furthermore, on the basis of the second embodiment, a friction groove is provided on the friction cam 25 , and a friction flange is designed on the outer wall of the friction disc 24 , and the friction flange is in transmission cooperation with the friction groove.

[0046] Furthermore, a scraper 20 is hingedly connected between the two platform frames 9 via a damping hinge. The scraper 20 is located below the assembly belt 12, and the end of the scraper 20 contacts the outer wall of the assembly belt 12. During the die-cutting process, some small waste materials or attachments will be generated. If these adhere to or attach to the outer wall of the assembly belt 12, they will affect the transmission quality between the assembly belt 12 and the transmission roller 11, and will also reduce the friction between the protective sheet and the assembly belt 12, affecting the conveying efficiency and material shaking efficiency of the protective sheet. In this embodiment, by designing the hinged scraper 20, it can scrape and clean the outer wall of the assembly belt 12 when it is running, effectively avoiding the attachments from interfering with the transmission of the assembly belt 12.

[0047] In summary, by utilizing the cooperation of the above-mentioned structures, the die-cutting, conveying and shaking of power battery protective sheets are realized, which improves the degree of automation, reduces working hours, improves efficiency, and enables more efficient shaking of waste materials.

[0048] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be directly processed according to existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description will be given here. Modes for Carrying Out the Invention

[0049] Type here a paragraph describing embodiments of the invention. Industrial Applicability

[0050] Type your industrial applicability description paragraph here. Sequence Listing Free Content

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Power battery protection sheet die-cutting and shaking integrated machine, characterized by: include: A die-cutting section, which slices the fed sheet; A material pulling section, which can convey the sheet material to the die-cutting section; The rear waste shaking section includes a conveyor belt platform and a material shaking device. The material shaking device can make the conveyor belt elements on the conveyor platform rise and fall, and the conveyor belt platform can change speed to make the sheet material vibrate and step.

2. The power battery protection sheet die-cutting and shaking integrated machine according to claim 1, characterized in that: The material pulling section comprises a frame (1), on which two groups of feeding assemblies are mounted, and the feeding assemblies comprise two pressing cylinders (3) mounted on the top of the frame (1), the output ends of the pressing cylinders (3) are both mounted with bearing seats (4), the bearing seats (4) are slidably mounted on the frame (1), a material pulling roller (2) is rotatably mounted between the two bearing seats (4), a servo motor for controlling the rotation of the material pulling roller (2) is mounted on the outer wall of the frame (1), and a front laminating roller cooperating with the material pulling roller (2) is mounted on the frame (1).

3. The power battery protection sheet die-cutting and shaking integrated machine according to claim 2, characterized in that: The die-cutting section comprises a machine table (5), a die-cutting table (6) is fixedly mounted on the top of the machine table (5), two guide rollers (7) are mounted in the internal space of the die-cutting table (6), the guide rollers (7) are engaged with the material pulling section, the two guide rollers (7) guide the feeding sheet, and a servo-controlled cutter (8) is mounted inside the die-cutting table (6).

4. The power battery protection sheet die-cutting and shaking integrated machine according to claim 1, characterized in that: The conveyor belt platform comprises two platform frames (9), two transmission rollers (11) are installed between the two platform frames (9), a plurality of equidistantly distributed assembly grooves (13) are provided on the two transmission rollers (11), a plurality of assembly belts (12) are transmission-connected between the two transmission rollers (11) via the plurality of assembly grooves (13), and a driver for controlling the speed change of the transmission rollers (11) is included.

5. The power battery protection sheet die-cutting and shaking integrated machine according to claim 4, characterized in that: The material shaking device comprises a main shaft (15) rotatably mounted between two platform frames (9), and the main shaft (15) is located in the middle of an area surrounded by an assembly belt (12), and the vertical distances between the main shaft (15) and the highest point and the lowest point are equal. A dividing frame (16) is fixedly mounted on the outer wall of the main shaft (15), and a plurality of first assembly rods (14) are rotatably mounted at the end of a circumferential array of the dividing frame (16), and the distance between the first assembly rods (14) and the main shaft (15) is greater than the vertical distance between the main shaft (15) and the highest point of the assembly belt (12), and a power motor for controlling the rotation of the main shaft (15) is mounted on the outer wall of the platform frame (9).

6. The power battery protection sheet die-cutting and shaking integrated machine according to claim 4, characterized in that: The driver comprises a conveying motor mounted on the outer wall of the platform frame (9), and the conveying motor is capable of controlling one of the transmission rollers (11) to change the rotation speed.

7. The power battery protection sheet die-cutting and shaking integrated machine according to claim 4, characterized in that: The material shaking device comprises a swing arm (17) coaxially hinged with the driving roller (11); a second assembly rod (21) is rotatably mounted on the outer wall of the swing arm (17); the second assembly rod (21) penetrates into the surrounding area of ​​the assembly belt (12); a friction cam (25) is rotatably mounted on the outer wall of the platform frame (9) through a bearing seat; a uniform speed motor for controlling the rotation of the friction cam (25) is mounted on the platform frame (9); a friction disk (24) is rotatably mounted on the outer wall of the swing arm (17); friction transmission is performed between the friction cam (25) and the friction disk (24); the area where the friction cam (25) and the friction disk (24) rub against each other is elliptical; and when the long axis of the friction cam (25) remains horizontal, the swing arm (17) is in a horizontal state.

8. The power battery protection sheet die-cutting and shaking integrated machine according to claim 7, characterized in that: The driver comprises a conveying gear (18) mounted on the outer wall of the platform frame (9); the conveying gear (18) rotates coaxially with the driving roller (11); the swing arm (17) rotates along the conveying gear (18); a dynamic gear (19) is rotatably mounted on the outer wall of the swing arm (17); the swing arm (17) rotates coaxially with the friction disk (24); the dynamic gear (19) is meshedly connected with the conveying gear (18); when the swing arm (17) rotates, the dynamic gear (19) orbits along the outer wall of the conveying gear (18).

9. The power battery protection sheet die-cutting and shaking integrated machine according to claim 7, characterized in that: The friction cam (25) is provided with a friction groove, and the outer wall of the friction disc (24) is provided with a friction flange, and the friction flange is in transmission cooperation with the friction groove.

10. The power battery protection sheet die-cutting and shaking integrated machine according to any one of claims 4 to 9, characterized in that: A scraper (20) is hingedly connected between the two platform frames (9) via a damping hinge. The scraper (20) is located below the assembly belt (12), and an end of the scraper (20) contacts the outer wall of the assembly belt (12).

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