Intelligent honeycomb paperboard press-fit forming equipment based on self-adaptive pressure adjustment

Abstract

The invention relates to the technical field of honeycomb paperboard processing, in particular to intelligent honeycomb paperboard press-fit forming equipment based on self-adaptive pressure adjustment, which comprises a belt conveyor, a gluing assembly is arranged at the top of the belt conveyor, and lifting assemblies for adjusting the height of the gluing assembly are arranged on the two sides of the belt conveyor. The gluing assembly is composed of an equidistant telescopic part, an adjusting part for adjusting the equidistant telescopic part and a movable gluing part, the equidistant telescopic part is composed of a telescopic unit and a supporting unit, and the supporting unit comprises a lifting table. According to the intelligent honeycomb paperboard press-fit forming equipment based on self-adaptive pressure adjustment, the positions of a plurality of movable gluing wheels are adjusted through the adjusting part, so that honeycomb paper with different widths can be glued, a gluing production line does not need to be replaced, and the adjusting mode is stepless adjustment, so that production and processing can be performed according to different customer requirements; and the production flexibility is improved.

Description

Technical Field

[0001] This invention relates to the field of honeycomb paperboard processing technology, specifically to an intelligent compression molding device for honeycomb paperboard based on adaptive pressure regulation. Background Technology

[0002] Honeycomb paperboard is an environmentally friendly packaging material made of corrugated base paper forming a honeycomb core, with two layers of laminated paper on each side. It is lightweight, compression-resistant, cushioning, and heat-insulating. Its honeycomb structure provides excellent cushioning performance, making it a viable alternative to EPS foam and widely used in home appliances, logistics, construction, and other fields.

[0003] Existing honeycomb paperboard production equipment has relatively limited dimensional options during production. When producing narrower honeycomb paperboard, during the gluing process, glue on the gluing rollers of the double-roller gluing machine can accumulate due to uneven roller surfaces or improper roller spacing. This glue can drip from areas not reached by the honeycomb paperboard onto the conveyor belt or from both ends of the gluing rollers, increasing maintenance costs and reducing production efficiency. Furthermore, the flexible size selection of honeycomb paperboard, with varying specifications for different applications, necessitates changing gluing lines for different batches to meet production demands. Therefore, we propose an intelligent compression molding device for honeycomb paperboard based on adaptive pressure adjustment. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent compression molding device for honeycomb paperboard based on adaptive pressure adjustment, so as to solve the problem mentioned in the background art where glue drips due to uneven surface of the coating roller or improper roller spacing, and subsequent maintenance of the conveyor belt is required. To achieve the above objectives, the present invention provides the following technical solution: a smart compression molding device for honeycomb paperboard based on adaptive pressure regulation, comprising a belt conveyor, a gluing assembly at the top of the belt conveyor, and lifting assemblies for adjusting the height of the gluing assembly on both sides of the belt conveyor. The gluing assembly consists of an equidistant telescopic part, an adjusting part for adjusting the equidistant telescopic part, and a movable gluing part. The equidistant telescopic part consists of a telescopic unit and a support unit. The support unit includes a lifting platform. The lifting platform has two first sliding grooves and two second sliding grooves that completely penetrate the lifting platform. A connecting plate is fixedly connected to the bottom of the lifting platform near the second sliding groove. A fixed gluing wheel is rotatably connected to one side of the connecting plate via a bearing. A first hollow tube is fixedly connected to the inside of the lifting platform and penetrates the lifting platform. A first dripping tube is fixedly connected to the bottom of the first hollow tube and is located directly above the fixed gluing wheel.

[0005] More preferably, the telescopic unit includes a fixed shaft fixedly connected to the bottom of the lifting platform, a first movable rod rotatably connected to the outer wall of the fixed shaft, a second movable rod hinged to both ends of the first movable rod, and a third movable rod hinged to the ends of the two second movable rods away from the first movable rod.

[0006] Further preferably, the movable adhesive application unit includes a movable adhesive brushing unit, a movable adhesive dispensing unit, and a limiting unit. The movable adhesive dispensing unit includes sliders that are slidably connected inside two second slide grooves and two first slide grooves, respectively. A second hollow tube is fixedly sleeved inside the slider. One end of the second hollow tube located in the second slide groove completely penetrates the slider and the second movable rod in sequence. The second hollow tube is rotatably connected to the second movable rod and extends through the middle of the second movable rod. A second drip tube is fixedly connected to the bottom of the second hollow tube. A slide table is slidably connected to the top of the lifting platform. A pin is fixedly connected inside the slide table. The bottom of the pin is rotatably connected to a third movable rod. One side of the slide table is fixedly connected to a slider on an adjacent first slide groove.

[0007] More preferably, the movable glue-applying unit includes a clamp fixedly sleeved on the outer wall of the second hollow tube, a connecting rod fixedly connected to the outer wall of the clamp, a bushing fixedly connected to the other end of the connecting rod, and a movable glue-applying wheel rotatably connected to the outer wall of the bushing via a bearing.

[0008] More preferably, the adjusting part includes a fixed seat fixedly connected to the top of the lifting platform, an adjusting screw is rotatably connected inside the fixed seat via a bearing, a protrusion is threadedly connected to the threaded section of the adjusting screw, and the bottom of the protrusion is fixedly connected to the top of the slide table, and an adjusting knob is fixedly connected to the end of the adjusting screw away from the protrusion.

[0009] More preferably, the limiting unit includes four extension plates fixedly connected to the bottom of the lifting platform, with each pair of extension plates forming a group. Each group of extension plates has a sliding rod fixedly connected to the opposite side of each group, and each sliding rod passes through two bushings in sequence. The bushings are slidably connected to the sliding rod.

[0010] More preferably, the lifting assembly includes fixed blocks that are respectively fixedly connected to the side plates on both sides of the belt conveyor. The fixed blocks have threaded rods rotatably connected to them through bearings, and both threaded rods are threaded through the lifting platform. A hand crank is fixedly connected to the bottom of one of the threaded rods. A transmission wheel is fixedly sleeved on the outer wall of the unthreaded section of both threaded rods. A transmission belt is connected to the outer wall of both transmission wheels.

[0011] More preferably, a fixed frame is fixedly connected to each of the two side plates of the belt conveyor, an electric push rod is fixedly connected to the top of the fixed frame, a lifting frame is fixedly connected to the output end of the electric push rod, a pressing roller is rotatably connected between the inner walls of opposite sides of the lifting frame through bearings, an extension arm is fixedly connected to each of the opposite sides of the fixed frame, a placement groove is opened on the top of the opposite side of the extension arm, and a detachable unwinding rod is rotatably connected to each of the two placement grooves through bearings.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the position of multiple movable coating wheels is adjusted by the adjustment unit, so that honeycomb paper of different widths can be coated without changing the coating production line. Moreover, the adjustment method is stepless, so production and processing can be carried out according to different customer needs, thereby improving production flexibility.

[0013] In this invention, the gluing assembly is adapted to the production of honeycomb paperboard of different sizes. Compared with the traditional gluing method, it avoids the situation where the gluing roller is too wide and glue drips onto the conveyor belt during the gluing process of narrow honeycomb paperboard. This reduces the difficulty of cleaning the conveyor belt and lowers maintenance costs and labor consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the diagram; Figure 3 For the present invention Figure 1 Schematic diagram of the structure at point B in the diagram; Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the adhesive coating assembly structure of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point C; Figure 7 This is a schematic cross-sectional view of the adhesive coating assembly of the present invention; Figure 8 This is a side view schematic diagram of the structure of the present invention.

[0015] In the diagram: 1. Belt conveyor; 2. Fixed block; 3. Lifting platform; 4. Fixed frame; 5. Fixed shaft; 6. Slider; 7. Slide table; 8. Extension plate; 21. Threaded rod; 22. Transmission wheel; 23. Transmission belt; 24. Hand crank; 31. Connecting plate; 32. Fixed glue-applying wheel; 33. First chute; 34. First hollow tube; 35. First drip tube; 36. Second chute; 41. Extension arm; 42. Unwinding rod; 43. Lifting frame; 44. Pressing roller; 51. First movable rod; 52. Second movable rod; 53. Third movable rod; 61. Second hollow tube; 62. Second drip tube; 63. Clamp; 64. Connecting rod; 65. Bushing; 66. Movable glue-applying wheel; 71. Pin; 72. Fixed seat; 73. Adjusting screw; 74. Adjusting knob; 75. Protrusion; 81. Slide rod. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-8 The present invention provides a technical solution: the intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure adjustment includes a belt conveyor 1. A gluing component is provided on the top of the belt conveyor 1, and lifting components for adjusting the height of the gluing component are provided on both sides of the belt conveyor 1. The gluing component consists of an equidistant telescopic part, an adjusting part for adjusting the equidistant telescopic part, and a movable gluing part. The equidistant telescopic part consists of a telescopic unit and a support unit. The support unit includes a lifting platform 3. The interior of the lifting platform 3 has two first slide grooves 33 and two second slide grooves 36 that completely penetrate the lifting platform 3. A connecting plate 31 is fixedly connected to the bottom of the lifting platform 3 near the second slide grooves 36. A fixed gluing wheel 32 is rotatably connected to one side of the connecting plate 31 through a bearing. A first hollow tube 34 is fixedly connected inside the lifting platform 3 and penetrates the lifting platform 3. A first dripping tube 35 is fixedly connected to the bottom of the first hollow tube 34 and is located directly above the fixed gluing wheel 32. The top of the lifting platform 3 is connected to a glue storage tank for storing glue via a bracket. The bottom of the glue storage tank is fixedly connected to multiple hoses. The other end of one of the hoses is fixedly connected to the top of the first hollow tube 34. The bottom of the first dripping tube 35 is provided with multiple drip holes for glue to drip. The surface of the fixed glue-applying wheel 32 is covered with a sponge for absorbing glue.

[0018] In this embodiment, as Figure 5 and Figure 7 As shown, the telescopic unit includes a fixed shaft 5 fixedly connected to the bottom of the lifting platform 3. A first movable rod 51 is rotatably connected to the outer wall of the fixed shaft 5. A second movable rod 52 is hinged to both ends of the first movable rod 51. A third movable rod 53 is hinged to the ends of the two second movable rods 52 away from the first movable rod 51. The first movable rod 51, the second movable rod 52 and the third movable rod 53 together form a scissor telescopic frame. The middle part of the second movable rod 52 is rotatably connected to the fixed shaft 5, so that the second movable rod 52 and the third movable rod 53 retract or extend to both sides with the fixed shaft 5 as the center. The second movable rod 52 and the first movable rod 51 have the same length, and the length of the third movable rod 53 is half that of the second movable rod 52.

[0019] In this embodiment, as Figure 2 , Figure 5 and Figure 7 As shown, the movable glue application unit includes a movable glue brushing unit, a movable glue dispensing unit, and a limiting unit. The movable glue dispensing unit includes a slider 6 that is slidably connected inside two second slide grooves 36 and two first slide grooves 33 respectively. A second hollow tube 61 is fixedly sleeved inside the slider 6. One end of the second hollow tube 61 located in the second slide groove 36 completely penetrates the slider 6 and the second movable rod 52 in sequence. The second hollow tube 61 is rotatably connected to the second movable rod 52, and the second hollow tube 61 passes through the middle of the second movable rod 52. The bottom of the second hollow tube 61 is fixedly connected to a second dripping tube 62. A slide table 7 is slidably connected to the top of the lifting platform 3. A pin 71 is fixedly connected inside the slide table 7. The bottom of the pin 71 is rotatably connected to the third movable rod 53. One side of the slide table 7 is fixedly connected to the slider 6 on the adjacent first slide groove 33. Each of the first slide groove 33 and the second slide groove 36 is slidably connected to a slider 6. The second hollow tube 61 in the second slide groove 36 is rotatably connected to the second movable rod 52 at 1 / 2. The slide table 7 and the third movable rod 53 are hinged by a pin 71. The slide table 7 is then fixedly connected to the slider 6 in the first slide groove 33. During the extension and retraction of the scissor telescopic frame, the slider 6 synchronously drives multiple second hollow tubes 61 to move from both sides toward the middle or from the middle to both sides at equal distances.

[0020] In this embodiment, as Figure 5 and Figure 6 As shown, the movable glue application unit includes a clamp 63 fixedly sleeved on the outer wall of the second hollow tube 61, a connecting rod 64 fixedly connected to the outer wall of the clamp 63, a bushing 65 fixedly connected to the other end of the connecting rod 64, and a movable glue application wheel 66 rotatably connected to the outer wall of the bushing 65 via a bearing. The movable glue-applying wheel 66 has the same structure as the fixed glue-applying wheel 32, and each second hollow tube 61 is fixedly connected to the bottom of the glue storage tank through a hose of sufficient length; The clamp 63 is fixed by two semi-circular retaining rings by bolts and is attached to the second hollow tube 61. One of the semi-circular retaining rings is fixedly connected to the connecting rod 64.

[0021] In this embodiment, as Figure 1 and Figure 2 As shown, the adjustment unit includes a fixed seat 72 fixedly connected to the top of the lifting platform 3. An adjustment screw 73 is rotatably connected inside the fixed seat 72 via a bearing. A protrusion 75 is threadedly connected to the threaded section of the adjustment screw 73. The bottom of the protrusion 75 is fixedly connected to the top of the slide table 7. An adjustment knob 74 is fixedly connected to the end of the adjustment screw 73 away from the protrusion 75. The unthreaded section of the adjusting screw 73 is rotatably connected to the fixed seat 72 via a bearing. By rotating the adjusting screw 73, the slide table 7 slides laterally, thereby allowing the scissor telescopic frame to extend or retract.

[0022] In this embodiment, as Figure 4 and Figure 5 As shown, the limiting unit includes four extension plates 8 fixedly connected to the bottom of the lifting platform 3, and each pair of extension plates 8 forms a group. Each group of extension plates 8 has a slide rod 81 fixedly connected to the opposite side. Each slide rod 81 passes through two bushings 65 in sequence, and the bushings 65 are slidably connected to the slide rod 81. The slide bar 81 has multiple slots on its surface, and the bushing 65 has protrusions on its inner wall that match the slots, so that the bushing 65 can slide stably on the slide bar 81. While providing support for the movable glue-applying wheel 66, the slide bar 81 also limits the movement of the movable glue-applying wheel 66 so that it can only slide laterally along the longitudinal direction of the slide bar 81.

[0023] In this embodiment, as Figure 1 and Figure 3 As shown, the lifting assembly includes a fixing block 2 that is fixedly connected to the side plates of the belt conveyor 1 on both sides. The inside of the fixing block 2 is rotatably connected to a threaded rod 21 through a bearing. Both threaded rods 21 are threaded through the lifting platform 3. A hand crank 24 is fixedly connected to the bottom of one of the threaded rods 21. A transmission wheel 22 is fixedly sleeved on the outer wall of the unthreaded section of both threaded rods 21. A transmission belt 23 is connected to the outer wall of both transmission wheels 22. Vertical rods that guide the lifting platform 3 are fixedly connected to both sides of the belt conveyor 1. The two vertical rods move through the lifting platform 3 to ensure the stability of the lifting platform 3 during the lifting process. By rotating the threaded rod 21 through the hand crank 24, the lifting platform 3 can be raised or lowered through the threaded connection of the threaded rod 21, thereby adjusting the height of the lifting platform 3 according to production needs, so that the fixed glue-applying wheel 32 and the movable glue-applying wheel 66 can apply glue to the top of the honeycomb paper.

[0024] In this embodiment, as Figure 1 , Figure 4 and Figure 8 As shown, a fixed frame 4 is fixedly connected to each of the two side plates of the belt conveyor 1. An electric push rod is fixedly connected to the top of the fixed frame 4. A lifting frame 43 is fixedly connected to the output end of the electric push rod. A pressing roller 44 is rotatably connected between the inner walls of the opposite side of the lifting frame 43 through a bearing. An extension arm 41 is fixedly connected to the opposite side of the fixed frame 4. A placement groove is opened on the top of the opposite side of the extension arm 41. A detachable unwinding rod 42 is rotatably connected to each of the two placement grooves through a bearing. The unwinding bar 42 is quickly assembled and disassembled through the open placement slot at the top of the extension arm 41. The unwinding bar 42 is fixed with clamps to hold the rolled-up face paper. When the honeycomb paper is conveyed by the belt conveyor 1, it passes the bottom of the fixed coating wheel 32 and the movable coating wheel 66 and is coated with glue on the top of the honeycomb paper. Then, when the face paper and the honeycomb paper pass the bottom of the pressing roller 44, the honeycomb paper and the face paper are bonded together by pressure.

[0025] The method of use and advantages of this invention: The intelligent compression molding device for honeycomb paperboard based on adaptive pressure regulation operates as follows: First, adjust the adjusting screw 73 according to the processing needs so that multiple movable gluing rollers 66 move laterally at equal intervals, so that the width covered by the multiple movable gluing rollers 66 can match the width of the produced honeycomb paperboard. When the slide table 7 moves toward the fixed seat 72, the scissor telescopic frame is stretched. At this time, multiple movable glue-applying wheels 66 extend equidistantly to both sides simultaneously, making the path covered by the movable glue-applying wheels 66 wider. It should be noted that the distance between two movable glue-applying wheels 66 on the same side should not be greater than the width of one movable glue-applying wheel 66. Otherwise, the honeycomb paper will be missed when applying glue, which will affect the quality of the product after lamination. When the slide table 7 moves away from the fixed seat 72, multiple movable glue-applying rollers 66 move synchronously and equidistantly from both sides toward the center, thereby narrowing the path covered by the multiple movable glue-applying rollers 66, thus applying glue to the narrow honeycomb paper. Furthermore, by adjusting the lead screw 73, the coverage width of the multiple movable glue-applying rollers 66 can be steplessly adjusted, thereby customizing products to meet different customer needs, increasing production flexibility, and expanding the customer base. Then, the unwound face paper is installed on the unwinding rod 42, and the face paper and honeycomb paper are passed through the bottom of the pressing roller 44. Then, the electric push rod is activated to press the pressing roller 44 onto the top of the face paper, so that the honeycomb paper and the face paper are bonded together. Then, the belt conveyor 1 is started. After the belt conveyor 1 starts, the honeycomb paper moves with the belt. When the honeycomb paper passes the bottom of the movable coating roller 66 and the fixed coating roller 32, the sponge on the surface of the movable coating roller 66 and the fixed coating roller 32 deforms and contacts the top of the honeycomb paper, so that the glue in the sponge is applied to the top of the honeycomb paper. As the honeycomb paper continues to move, it will pass the bottom of the pressure roller 44, and the face paper will be glued to the honeycomb paper under the pressure of the pressure roller 44. The electric actuator is of model ElectrakXD, which can adaptively adjust the pressure parameters as needed to adapt to the production of honeycomb paperboard of different thicknesses.

Claims

1. A smart compression molding device for honeycomb paperboard based on adaptive pressure regulation, characterized in that, The system includes a belt conveyor (1), with an adhesive application assembly on top and lifting assemblies for adjusting the height of the adhesive application assembly on both sides. The adhesive application assembly consists of an equidistant telescopic section, an adjusting section for adjusting the equidistant telescopic section, and a movable adhesive application section. The equidistant telescopic section consists of a telescopic unit and a support unit. The support unit includes a lifting platform (3), and the interior of the lifting platform (3) has two first sliding grooves (33) and two second sliding grooves that completely penetrate the lifting platform (3). The bottom of the lifting platform (3) near the second sliding groove (36) is fixedly connected to a connecting plate (31). A fixed glue-applying wheel (32) is rotatably connected to one side of the connecting plate (31) via a bearing. A first hollow tube (34) is fixedly connected inside the lifting platform (3) and the first hollow tube (34) penetrates the lifting platform (3). A first dripping tube (35) is fixedly connected to the bottom of the first hollow tube (34) and is located directly above the fixed glue-applying wheel (32).

2. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 1, characterized in that: The telescopic unit includes a fixed shaft (5) fixedly connected to the bottom of the lifting platform (3). A first movable rod (51) is rotatably connected to the outer wall of the fixed shaft (5). A second movable rod (52) is hinged to both ends of the first movable rod (51). A third movable rod (53) is hinged to one end of each of the two second movable rods (52) away from the first movable rod (51).

3. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 2, characterized in that: The movable glue application unit includes a movable glue brushing unit, a movable glue dispensing unit, and a limiting unit. The movable glue dispensing unit includes a slider (6) that is slidably connected inside two second slide grooves (36) and two first slide grooves (33). A second hollow tube (61) is fixedly sleeved inside the slider (6). One end of the second hollow tube (61) located in the second slide groove (36) completely penetrates the slider (6) and the second movable rod (52) in sequence. The second hollow tube (61) is rotatably connected to the second movable rod (52), and the second hollow tube (61) penetrates through the middle of the second movable rod (52). The bottom of the second hollow tube (61) is fixedly connected to a second drip tube (62). A slide table (7) is slidably connected to the top of the lifting platform (3). A pin (71) is fixedly connected inside the slide table (7). The bottom of the pin (71) is rotatably connected to the third movable rod (53). One side of the slide table (7) is fixedly connected to the slider (6) on the adjacent first slide groove (33).

4. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 3, characterized in that: The movable glue-applying unit includes a clamp (63) fixedly sleeved on the outer wall of the second hollow tube (61), a connecting rod (64) fixedly connected to the outer wall of the clamp (63), a bushing (65) fixedly connected to the other end of the connecting rod (64), and a movable glue-applying wheel (66) rotatably connected to the outer wall of the bushing (65) via a bearing.

5. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 4, characterized in that: The adjustment unit includes a fixed seat (72) fixedly connected to the top of the lifting platform (3). An adjusting screw (73) is rotatably connected inside the fixed seat (72) via a bearing. A protrusion (75) is threadedly connected to a threaded section of the adjusting screw (73), and the bottom of the protrusion (75) is fixedly connected to the top of the slide (7). An adjusting knob (74) is fixedly connected to the end of the adjusting screw (73) away from the protrusion (75).

6. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 5, characterized in that: The limiting unit includes four extension plates (8) fixedly connected to the bottom of the lifting platform (3), and each pair of extension plates (8) forms a group. Each group of extension plates (8) has a sliding rod (81) fixedly connected to the opposite side. Each sliding rod (81) passes through two bushings (65) in sequence. The bushings (65) are slidably connected to the sliding rod (81).

7. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 6, characterized in that: The lifting assembly includes fixed blocks (2) that are fixedly connected to the side plates of the belt conveyor (1) respectively. The fixed blocks (2) are rotatably connected to threaded rods (21) through bearings. Both threaded rods (21) are threaded through the lifting platform (3). A hand crank (24) is fixedly connected to the bottom of one of the threaded rods (21). A transmission wheel (22) is fixedly sleeved on the outer wall of the unthreaded section of both threaded rods (21). A transmission belt (23) is connected to the outer wall of both transmission wheels (22).

8. The intelligent compression molding equipment for honeycomb paperboard based on adaptive pressure regulation according to claim 7, characterized in that: The belt conveyor (1) has fixed frames (4) fixedly connected to its two side plates respectively. The top of the fixed frame (4) is fixedly connected to an electric push rod. The output end of the electric push rod is fixedly connected to a lifting frame (43). The inner walls of the opposite side of the lifting frame (43) are rotatably connected to a pressing roller (44) through a bearing. The opposite side of the fixed frame (4) is fixedly connected to an extension arm (41). The top of the opposite side of the extension arm (41) is provided with a placement groove. Both placement grooves are rotatably connected to a detachable unwinding rod (42) through a bearing.

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