Automatic uncoiler for plastic film surface winding
Patent Information
- Application Number
- CN202521331910.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-06-27
AI Technical Summary
[0004]近年来，随着技术的进步，收卷速度越来越快，可以达到每分钟150～200米，而轴承的制作质量也越来越精良，所以，经常出现当收卷轴转移到卸卷摆臂上面时，膜卷仍在惯性的作用下保持高速旋转，高速旋转引起的中心偏移可能使收卷轴意外提前脱离卸卷摆臂的弧形凹口，进而使膜卷和收卷轴意外提前掉落到运卷小车上；另外，如果膜卷接触到运卷小车时仍在转动，则有可能擦伤膜卷表面，影响膜卷外观
一、本实用新型自动卸卷过程中，水平气缸通过轴承座推动收卷轴向前移动，内轴承由纵向滑轨移动到卸卷摆臂上端的圆弧形凹口，在此过程中，收卷轴端部光轴段经过胶质刹片下方并与胶质刹片表面接触，胶质刹片的摩擦力能将原来高速转动的塑料膜卷逐渐刹停，从而避免塑料膜卷跟随卸卷摆臂摆动转移过程中仍然高速旋转而意外提前掉落，也能避免塑料膜卷在接触运卷小车时仍然旋转而擦伤膜卷表面。
Smart Images
Figure CN224831455U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of plastic film processing and production equipment, and in particular relates to an automatic unwinding device for surface winding of plastic film. Background Technology
[0002] During the surface winding process of the plastic film, the film roll is wound onto a winding shaft, which extends laterally. Each end of the winding shaft is equipped with an outer bearing and an inner bearing, with the outer bearing located outside the inner bearing. Both ends of the winding shaft are supported by the inner bearings on the top edges of two vertical wall panels on the left and right sides, forming a longitudinal slide rail. The weight of the film roll is mainly borne by the vertical wall panels. The winding shaft is located in front of the surface friction roller, which presses against the back of the film roll. The surface friction roller rotates continuously, using its frictional force to rotate the film roll (hence the term "surface winding"). As the diameter of the film roll increases, the film roll and the winding shaft gradually move forward along the longitudinal slide rail, while the surface friction roller remains stationary.
[0003] After winding is completed, the film roll needs to be transferred from the longitudinal slide rail to the transport trolley. The component responsible for this transfer function is the hydraulically driven unwinding swing arm. The upper end of the unwinding swing arm has an arc-shaped notch. The unwinding swing arm is located directly in front of the longitudinal slide rail. When the unwinding swing arm is in an upright position, the rear end of the arc-shaped notch is smoothly connected to the front end of the longitudinal slide rail. Each end of the winding shaft is also equipped with a bearing seat. The bearing seat and the horizontal cylinder are located on the outside of the upright wall panel. Each bearing seat has two clamping arms, one in front and one in back. The rear clamping arm is fixed on the bearing seat, and the front clamping arm is movably mounted on the bearing seat. The two clamping arms form an upward-opening U-shaped fork. The outer bearing of each end of the winding shaft is placed in the U-shaped fork of the corresponding side bearing seat. However, the weight of the winding shaft and the film roll is mainly borne directly by the two upright wall panels on the left and right. The U-shaped fork of the bearing seat only controls the longitudinal position of the winding shaft. After winding is completed, the horizontal cylinder pushes the winding shaft and the film roll forward along the longitudinal slide rail through the bearing seat. When the winding shaft moves to the front end of the longitudinal slide rail, the front clamping arm of the U-shaped fork opens, and the inner bearings at both ends of the winding shaft fall into the arc-shaped recess of the unwinding swing arm and are detected by the photoelectric eye mechanism. Then, the hydraulic cylinder drives the unwinding swing arm to swing forward, and the film roll and the winding shaft are separated from the longitudinal slide rail. After that, the weight of the film roll is pressed on the unwinding swing arm through the inner bearing until the film roll is transferred to the winding trolley in front of the unwinding swing arm, completing the unwinding process.
[0004] In recent years, with the advancement of technology, winding speeds have become increasingly faster, reaching 150 to 200 meters per minute. The manufacturing quality of bearings has also become increasingly sophisticated. As a result, when the winding shaft is transferred to the unwinding swing arm, the film roll continues to rotate at high speed due to inertia. The center offset caused by high-speed rotation may cause the winding shaft to accidentally disengage from the arc-shaped notch of the unwinding swing arm prematurely, resulting in the film roll and winding shaft falling onto the transport trolley prematurely. In addition, if the film roll is still rotating when it comes into contact with the transport trolley, it may scratch the surface of the film roll, affecting its appearance. Utility Model Content
[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an automatic unwinding device for the surface winding of plastic film. It can prevent the plastic film roll from falling off prematurely due to high-speed rotation during the swing transfer process of the unwinding arm, and can also prevent the plastic film roll from being scratched on the surface of the film roll while it is still rotating when it comes into contact with the transport trolley.
[0006] The objective can be achieved as follows: An automatic unwinding device for surface-wound plastic film includes a surface friction roller, a winding shaft, and two upright wall panels. The two ends of the surface friction roller are respectively mounted on the two upright wall panels. The winding shaft and the surface friction roller extend laterally. The top edge of the front half of each upright wall panel forms a longitudinal slide rail. A hydraulically driven unwinding swing arm is installed directly in front of the front half of each upright wall panel. The swing shaft of the unwinding swing arm extends laterally, and an arc-shaped notch is formed at the upper end of the unwinding swing arm. When the unwinding swing arm is in an upright position, the rear end of the arc-shaped notch smoothly connects to the front end of the longitudinal slide rail. Each end of the winding shaft is provided with an outer bearing and an inner bearing. The outer bearing is located laterally outside the inner bearing, and a lateral gap is left between the outer bearing and the inner bearing. The section of the winding shaft end located between the outer bearing and the inner bearing is called the winding shaft end smooth shaft section. The lateral position of the inner bearing is relative to... The system includes a longitudinal slide rail; each end of the take-up shaft is equipped with a bearing seat and a horizontal cylinder, located on the lateral outer side of the vertical wall panel. The piston rod of the horizontal cylinder drives the bearing seat on the corresponding side. Each bearing seat has a front clamping arm and a rear clamping arm, with the rear clamping arm fixed on the bearing seat and the front clamping arm movably mounted on the bearing seat. A U-shaped fork with an upward opening is formed between the front and rear clamping arms. In the winding state, the outer bearing at each end of the take-up shaft is located in the U-shaped fork on the corresponding side, and the inner bearing at each end of the take-up shaft is supported on the longitudinal slide rail on the corresponding side. The system is characterized by: two left and right hangers, each with a long strip of rubber brake pad installed underneath. The rubber brake pad is longitudinal in length, with its surface facing downwards. The lateral position of the rubber brake pad is aligned with the optical shaft section at the end of the take-up shaft, and the vertical distance between the rubber brake pad and the longitudinal slide rail is less than the diameter of the optical shaft section at the end of the take-up shaft.
[0007] The rear end of the rubber brake pad has a slope that is lower at the front and higher at the rear.
[0008] Each bearing housing has a vertical guide hole for the front clamping arm to pass through. The front clamping arm can slide vertically through the vertical guide hole. The bottom end of the front clamping arm is equipped with a roller, and a roller guide rail is fitted below the roller. The roller guide rail is divided into three sections: front, middle, and rear. The vertical position of the front section of the roller guide rail is lower than that of the rear section. The middle section of the roller guide rail has an inclination that is lower at the front and higher at the rear. The roller is located on the roller guide rail. When the inner bearing of the take-up shaft moves to the front end of the longitudinal slide rail, the roller at the bottom end of the front clamping arm is located above the front section of the roller guide rail, and the upper end of the front clamping arm is temporarily hidden in the vertical guide hole of the bearing housing.
[0009] The height of the front half of the upright wall panel is lower than the height of the rear half of the upright wall panel, and the rear end of each hanger is fixedly connected to the rear half of the upright wall panel.
[0010] This utility model has the following advantages and effects: 1. During the automatic unloading process of this utility model, the horizontal cylinder pushes the winding shaft forward through the bearing seat. The inner bearing moves from the longitudinal slide rail to the arc-shaped notch at the upper end of the unloading swing arm. During this process, the optical shaft section at the end of the winding shaft passes under the rubber brake pad and contacts the surface of the rubber brake pad. The friction of the rubber brake pad can gradually stop the plastic film roll that was originally rotating at high speed, thereby preventing the plastic film roll from continuing to rotate at high speed and accidentally falling off prematurely during the swing transfer process of the unloading swing arm. It can also prevent the plastic film roll from continuing to rotate and scratching the surface of the film roll when it contacts the transport trolley.
[0011] 2. During the automatic unloading process, the front clamping arm remains in contact with the upper surface of the roller guide rail under its own weight. When the longitudinal position of the take-up shaft is in the middle and rear section of the longitudinal slide rail, the roller at the bottom of the front clamping arm is located above the front section of the roller guide rail, and the upper section of the front clamping arm is exposed above the bearing seat, forming an upward-opening U-shaped fork between the front clamping arm and the rear clamping arm; when the longitudinal position of the take-up shaft moves to the front end of the longitudinal slide rail, the roller at the bottom of the front clamping arm is located on the front section of the roller guide rail, and the top of the front clamping arm is temporarily hidden in the vertical guide hole of the bearing seat. That is, the front clamping arm of the U-shaped fork automatically and temporarily avoids the inner bearing of the take-up shaft. Therefore, the front clamping arm will not prevent the inner bearing at the end of the take-up shaft from transferring from the U-shaped fork of the bearing seat to the arc-shaped fork of the unloading swing arm. Attached Figure Description
[0012] Figure 1 This is a schematic side view of the overall structure of a specific embodiment of the present utility model.
[0013] Figure 2 yes Figure 1 A magnified schematic diagram of the central part of the structure.
[0014] Figure 3 This is a schematic diagram of the cross-sectional structure of the bearing housing when the roller at the bottom of the front clamping arm is located above the middle and rear section of the roller guide rail.
[0015] Figure 4 This is a schematic diagram of the cross-sectional structure of the bearing housing when the roller at the bottom of the front clamping arm is located above the front section of the roller guide rail.
[0016] Figure 5 This is a top view of the overall structure of a specific embodiment of the present invention.
[0017] Figure 6 yes Figure 5 A magnified schematic diagram of the structure of part G.
[0018] Figure 7 This is a diagram illustrating the winding status during the normal winding process.
[0019] Figure 8 This is a schematic diagram showing the state of the optical shaft section at the end of the winding shaft when it passes under the rubber brake pad during the unwinding process.
[0020] Figure 9 This is a schematic diagram showing the state of the take-up shaft when it moves to the frontmost edge of the longitudinal slide rail.
[0021] Figure 10 This is a schematic diagram showing how the unloading swing arm moves the film roll and rewind shaft to the transport trolley. Detailed Implementation
[0022] Figure 1 , Figure 2 , Figure 5 , Figure 6An automatic unwinding device for surface winding of plastic film is shown, comprising a surface friction roller 1, a winding shaft 2, and two vertical wall panels 3 on the left and right. Each vertical wall panel 3 includes a front half 31 and a rear half 32, with the height of the front half 31 being lower than the height of the rear half 32. The two ends of the surface friction roller 1 are respectively mounted on the left and right vertical wall panels 3, specifically with the central axis of the surface friction roller 1 close to the rear end of the front half 31 of the vertical wall panel. The winding shaft 2 and the surface friction roller 1 extend laterally, and the top edge of the front half 31 of each vertical wall panel forms a longitudinal slide rail 30. An unwinding swing arm 4 is installed directly in front of the front half of each vertical wall panel, with the swing shaft 42 of the unwinding swing arm 4 extending laterally, and an arc-shaped notch 4 formed at the upper end of the unwinding swing arm 4. 0. The unwinding swing arm 4 is driven by the hydraulic cylinder 41 to swing back and forth. When the unwinding swing arm 4 is in an upright position, the rear end of the arc-shaped notch 40 is smoothly connected to the front end of the longitudinal slide rail 30. Each end of the take-up shaft 2 is provided with an outer bearing 21 and an inner bearing 22. The outer bearing 21 is located on the lateral outside of the inner bearing 22. There is a lateral gap between the outer bearing 21 and the inner bearing 22. The section of the take-up shaft end located between the outer bearing 21 and the inner bearing 22 is called the take-up shaft end smooth shaft section 20. The lateral position of the inner bearing 22 is aligned with the longitudinal slide rail 30 and the unwinding swing arm 4. Each end of the take-up shaft 2 is also equipped with a bearing seat 5 and a horizontal cylinder 50. The piston rod 501 of the horizontal cylinder 50 drives and connects to the bearing seat 5 on the corresponding side. The bearing seat 5 and the horizontal cylinder 50 are located on the outer side of the corresponding upright wall panel 3.
[0023] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, each bearing housing 5 is provided with a front clamping arm 61 and a rear clamping arm 62, wherein the rear clamping arm 62 is fixed on the bearing housing 5, and the front clamping arm 61 is movably mounted on the bearing housing 5. Each bearing housing 5 has a vertical guide hole 51 for the front clamping arm 61 to pass through, and the front clamping arm 61 can slide vertically through the vertical guide hole 51. The bottom end of the front clamping arm 61 is provided with a roller 90, and a roller guide rail 9 is provided below the roller 90. The roller guide rail 9 is divided into three sections: front, middle and rear. Specifically, the front section of the roller guide rail ( Figure 2 , Figure 3 Middle section of FE), middle section of roller guide rail ( Figure 2 , Figure 3 Middle ED section), rear section of roller guide rail ( Figure 2 , Figure 3 The middle section (DC section) has a vertical position where the front section EF of the roller guide rail is lower than the rear section CD of the roller guide rail, and the middle section ED of the roller guide rail has an inclination that is lower at the front and higher at the rear. The roller 90 is located on the roller guide rail 9. When the longitudinal position of the take-up shaft 2 moves to the middle and rear section of the longitudinal slide rail 30, the roller 90 at the bottom of the front clamping arm is located on the rear section of the roller guide rail. Figure 2 , Figure 3 Above the middle DC section, the upper section of the front clamping arm 61 protrudes above the bearing housing 5, forming an upward-opening U-shaped fork 60 between the front clamping arm 61 and the rear clamping arm 62, as shown. Figure 3 , Figure 7 , Figure 8 As shown; in the winding state, the outer bearing 21 at each end of the winding shaft is located in the corresponding U-shaped fork 60, and the inner bearing 22 at each end of the winding shaft is supported on the corresponding longitudinal slide rail 30, as shown. Figure 7 As shown; when the inner bearing 22 of the take-up shaft 2 moves to the foremost end of the longitudinal slide rail 30, the roller 90 at the bottom end of the front clamping arm 61 is located at the front section of the roller guide rail ( Figure 2 , Figure 4 The upper end of the front clamping arm 61 (in the middle EF section) is temporarily hidden in the vertical guide hole 51 of the bearing housing, as... Figure 4 , Figure 9 As shown.
[0024] Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, two left and right hangers 7 are also provided. The rear end of each hanger 7 is fixedly connected to the rear half 32 of the upright wall panel, and the front end of each hanger 7 is cantilevered. A long strip of rubber brake pad 71 is installed under each hanger 7. The length of the rubber brake pad 71 is longitudinal, and the rear end section of the rubber brake pad 71 ( Figure 2 The middle BA section has a slope that is lower at the front and higher at the rear. The surface of the rubber brake pad 71 faces downward. The lateral position of the rubber brake pad 71 is aligned with the optical shaft section 20 at the end of the take-up shaft. The vertical distance between the rubber brake pad 71 and the longitudinal slide rail is less than the diameter of the optical shaft section 20 at the end of the take-up shaft.
[0025] The working principle of the above embodiments is as follows: During normal winding, the upper section of the front clamping arm 61 protrudes above the bearing seat 5, forming an upward-opening U-shaped fork 60 between the front clamping arm 61 and the rear clamping arm 62. The outer bearing 21 at each end of the winding shaft is located in the corresponding U-shaped fork 60, and the inner bearing 22 at each end of the winding shaft is supported on the corresponding longitudinal slide rail 30. The film roll 8 is wound on the winding shaft 2, and the weight of the film roll 8 and the winding shaft 2 is mainly supported by the two vertical wall plates 3 on the left and right sides. The film roll 8 is driven to rotate by the surface friction roller 1. Figure 7 As shown; After winding is completed, unwinding is performed. The horizontal cylinder 50 pushes the winding shaft 2 and the film roll 8 forward via the bearing seat 5. During this process, the optical shaft section 20 at the end of the winding shaft passes under the rubber brake pad 71 and contacts the surface of the rubber brake pad 71. Figure 8 As shown, when in contact, there is a certain pressure, and the friction of the rubber brake pad 71 can gradually stop the originally high-speed rotating winding shaft 2 and film roll 8. As the take-up shaft 2 moves forward, the front clamping arm 61 gradually lowers under its own weight as the roller guide rail 9 gradually descends. When the inner bearing 22 of the take-up shaft 2 moves to the foremost end of the longitudinal slide rail 30, the roller 90 at the bottom of the front clamping arm 61 is located on the front section of the roller guide rail, the front clamping arm 61 lowers, and the upper end of the front clamping arm 61 is temporarily hidden in the vertical guide hole 51 of the bearing seat. That is, the U-shaped fork of the front clamping arm 61 automatically and temporarily avoids the inner bearing 22 of the take-up shaft. Figure 4 As shown; thereafter, the inner bearing 22 is transferred from the longitudinal slide rail 30 to the arc-shaped notch 40 at the upper end of the unwinding swing arm, and the weight of the film roll 8 and the take-up shaft 2 is also transferred to the left and right unwinding swing arms 4, as shown. Figure 9 As shown; When the photoelectric sensor detects that the inner bearing 22 has moved from the longitudinal slide rail 30 to the arc-shaped notch 40 at the upper end of the unloading swing arm, the piston rod of the hydraulic cylinder 41 extends, and the left and right unloading swing arms 4 swing forward, driving the film roll 8 and the take-up shaft 2 to transfer to the transport trolley 81. Figure 10 As shown, the unwinding process is complete.
Claims
1. An automatic unwinding device for surface winding of plastic film, comprising a surface friction roller, a winding shaft, and two vertical wall plates, wherein the two ends of the surface friction roller are respectively mounted on the two vertical wall plates, the winding shaft and the surface friction roller extend in a transverse direction, and the top edge of the front half of each vertical wall plate forms a longitudinal slide rail; a hydraulically driven unwinding swing arm is installed directly in front of the front half of each vertical wall plate, the swing shaft of the unwinding swing arm extends in a transverse direction, and an arc-shaped notch is formed at the upper end of the unwinding swing arm, wherein when the unwinding swing arm is in an upright position, the rear end of the arc-shaped notch is smoothly connected to the front end of the longitudinal slide rail; each end of the winding shaft is provided with an outer bearing and an inner bearing, the outer bearing being located outside the inner bearing, and a gap is left between the outer bearing and the inner bearing. The transverse spacing, the section at the end of the take-up shaft located between the outer bearing and the inner bearing is called the take-up shaft end smooth shaft section; the transverse position of the inner bearing is aligned with the longitudinal slide rail; each end of the take-up shaft is also equipped with a bearing seat and a horizontal cylinder, the bearing seat and the horizontal cylinder are located on the transverse outer side of the corresponding vertical wall panel, the piston rod of the horizontal cylinder drives the bearing seat on the corresponding side; each bearing seat is equipped with a front clamping arm and a rear clamping arm, wherein the rear clamping arm is fixed on the bearing seat, and the front clamping arm is movably mounted on the bearing seat, forming an upward-opening U-shaped fork between the front clamping arm and the rear clamping arm; in the winding state, the outer bearing at each end of the take-up shaft is located in the corresponding U-shaped fork, and the inner bearing at each end of the take-up shaft is supported on the corresponding longitudinal slide rail; characterized in that: It is also equipped with two hangers on the left and right, and a long strip of rubber brake pad is installed under each hanger. The rubber brake pad is longitudinal, with its surface facing downwards. The lateral position of the rubber brake pad is aligned with the optical shaft section at the end of the take-up shaft. The vertical distance between the rubber brake pad and the longitudinal slide rail is less than the diameter of the optical shaft section at the end of the take-up shaft.
2. The automatic unwinding device for surface winding of plastic film according to claim 1, characterized in that: The rear end of the rubber brake pad has a slope that is lower at the front and higher at the rear.
3. An automatic unwinding device for surface winding of plastic film according to claim 1 or 2, characterized in that: Each bearing housing has a vertical guide hole for the front clamping arm to pass through. The front clamping arm can slide vertically through the vertical guide hole. The bottom end of the front clamping arm is equipped with a roller, and a roller guide rail is fitted below the roller. The roller guide rail is divided into three sections: front, middle, and rear. The vertical position of the front section of the roller guide rail is lower than that of the rear section. The middle section of the roller guide rail has an inclination that is lower at the front and higher at the rear. The roller is located on the roller guide rail. When the longitudinal position of the take-up shaft moves to the front end of the longitudinal slide rail, the roller at the bottom end of the front clamping arm is located above the front section of the roller guide rail, and the upper end of the front clamping arm is temporarily hidden in the vertical guide hole of the bearing housing.
4. An automatic unwinding device for surface winding of plastic film according to claim 1 or 2, characterized in that: The height of the front half of the upright wall panel is lower than the height of the rear half of the upright wall panel, and the rear end of each hanger is fixedly connected to the rear half of the upright wall panel.