A take-off device for a film blowing machine

Abstract

The application relates to a leading-out device of a film blowing machine and relates to the technical field of plastic film production equipment, and comprises a rack, a plurality of guide rollers rotatably installed on the rack and a winding roller rotatably arranged at the end of the rack. A roller grabbing mechanism for grabbing and moving the winding roller is arranged on the rack. The application realizes automatic grabbing, moving and roll changing of the winding roller through the arrangement of the roller grabbing mechanism, manual operation of workers is not needed, labor intensity is reduced, and human cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of plastic film production equipment, and in particular to an outlet device for a blown film machine. Background Technology

[0002] A blown film machine is a device that heats and melts plastic granules to blow them into a thin film, and it is widely used in the plastic packaging industry. During the production process of a blown film machine, after the film is extruded from the die, it needs to be conveyed to the subsequent winding process via an output device. However, the output devices of existing blown film machines usually require manual roll changing by operators. This not only requires operators to be on standby at all times, but the work intensity during roll changing is also relatively high, usually requiring two operators working together, resulting in high labor costs. Utility Model Content

[0003] In order to realize automatic roll changing of the blown film machine's output device and reduce the labor intensity and labor costs of workers, this application provides an output device for a blown film machine.

[0004] The present application provides an outlet device for a blown film machine, which adopts the following technical solution: An output device for a blown film machine includes a frame and a plurality of guide rollers rotatably mounted on the frame. A take-up roller is rotatably disposed at the end of the frame. A roller gripping mechanism for gripping and moving the take-up roller is disposed on the frame. The roller gripping mechanism includes: A movable frame, which is horizontally slidably mounted on the machine frame; A drive assembly, which is mounted on a frame and is used to drive the moving frame to move horizontally. A telescopic hydraulic cylinder is mounted on a movable frame, and the piston rod of the telescopic hydraulic cylinder extends and retracts vertically. A mechanical gripper is located at the bottom end of the piston rod of a telescopic hydraulic cylinder and is used to grip the take-up roller.

[0005] By adopting the above technical solution, when a roll changing operation is required, the drive assembly can drive the moving frame to move horizontally on the frame, transporting the mechanical claw to the top of the take-up roll to be gripped. Then, the piston rod of the telescopic hydraulic cylinder extends and retracts downward, driving the mechanical claw to approach the take-up roll. After the mechanical claw grips the take-up roll, the piston rod of the telescopic hydraulic cylinder retracts upward, and the drive assembly drives the moving frame to move, transporting the take-up roll to the designated position. This realizes the automatic movement and roll changing of the take-up roll, eliminating the need for manual handling by staff, effectively reducing the labor intensity of staff and reducing labor costs.

[0006] Optionally, the driving component includes: A drive screw is rotatably mounted on the frame and is positioned horizontally. A drive motor is mounted on the frame and its output shaft is connected to a drive screw. A drive block is horizontally slidably mounted on the frame and threadedly connected to a drive screw, and a telescopic hydraulic cylinder is mounted on the drive block.

[0007] By adopting the above technical solution, when the drive motor starts, its output shaft drives the drive screw to rotate. Since the drive block is threadedly connected to the drive screw and slides horizontally on the frame, the rotation of the drive screw is converted into the horizontal movement of the drive block, which in turn drives the telescopic hydraulic cylinder and mechanical claw mounted on the drive block to move horizontally synchronously. The screw drive method has the advantages of high transmission accuracy and stable operation, and can precisely control the movement position of the mechanical claw, ensuring accurate gripping and placement of the take-up roller.

[0008] Optionally, the mechanical gripper includes: Mounting base, wherein the mounting base is disposed at the end of the piston rod of the telescopic hydraulic cylinder; Two claw hooks are rotatably mounted on the mounting base. The claw hooks are arranged in an "L" shape, and the rotation point of the claw hooks is located at the bend. A rotating assembly is mounted on a mounting base and is used to drive two claw hooks to rotate synchronously in opposite directions.

[0009] By adopting the above technical solution, the mounting base provides a stable mounting carrier for the claw hooks and the rotating assembly. When it is necessary to grip the take-up roller, the rotating assembly drives the two "L"-shaped claw hooks to rotate synchronously in opposite directions around their respective rotation points, bringing the gripping ends of the two claw hooks closer together, thereby clamping the take-up roller; when it is necessary to release the take-up roller, the rotating assembly drives the two claw hooks to rotate synchronously in opposite directions, moving the gripping ends away from each other, thus releasing the take-up roller. The "L"-shaped structure of the claw hooks can better conform to the shape of the take-up roller, improving the stability of gripping.

[0010] Optionally, the rotating assembly includes: A rotary electric cylinder, which is mounted on a mounting base; Mounting block, the mounting block being mounted on the piston rod of the rotating electric cylinder; A rotating shaft is rotatably mounted on a mounting block, and the ends of the two claw hooks near the rotating electric cylinder are rotatably connected to the rotating shaft.

[0011] By adopting the above technical solution, when the piston rod of the rotary electric cylinder extends or retracts, it drives the mounting block to move along the extension and retraction direction of the piston rod. The movement of the mounting block, in turn, drives the two claw hooks to move synchronously towards one end of the rotary electric cylinder via the rotating shaft. Since the claw hooks are rotatably mounted on the mounting base, and the rotation point is located at the bend, the movement of one end of the claw hook is converted into rotation around the rotation point, thereby achieving synchronous counter-rotation of the two claw hooks. This transmission method has a simple structure, rapid response, and can precisely control the rotation angle of the claw hooks, ensuring the reliability of the gripping and releasing actions.

[0012] Optionally, both ends of the take-up roller are equipped with gripping rings that rotate via bearings, and the outer wall of the gripping ring is provided with a slot for the claw hook to engage.

[0013] By adopting the above technical solution, the gripper ring is rotatably connected to the take-up roller via bearings. This allows the gripper ring to remain relatively stationary while the take-up roller rotates to take up the film, preventing the mechanical claw from rotating with the take-up roller during the gripping process and improving gripping stability. Simultaneously, the slots on the gripper ring provide accurate positioning for the claw hooks, allowing them to precisely engage with the slots, further enhancing gripping strength and preventing the take-up roller from detaching during movement.

[0014] Optionally, the frame is equipped with a thickness sensor for detecting the winding thickness of the take-up roller. The thickness sensor is a laser displacement sensor and is located on the side of the take-up roller. The thickness sensor is used to detect the thickness of the film winding in real time. The frame is also equipped with a controller, and the thickness sensor, drive motor, telescopic hydraulic cylinder and rotary electric cylinder are all electrically connected to the controller.

[0015] By adopting the above technical solution, the laser displacement sensor features high detection accuracy and fast response speed, enabling it to accurately detect the film thickness on the take-up roller in real time and transmit the detected thickness signal to the controller. When the film thickness reaches the preset value, the controller automatically issues a control command, sequentially controlling the drive motor, telescopic hydraulic cylinder, and rotary electric cylinder to achieve automatic roll changing. This eliminates the need for manual judgment of the roll changing timing, further improving the automation level of the device. Simultaneously, the centralized control of each actuator by the controller ensures coordinated operation between various actions, improving roll changing efficiency and reliability.

[0016] Optionally, the frame is provided with a positioning seat at the winding station for positioning the winding roller. The positioning seat is U-shaped, with an elastic pad on the inner wall and a pressure sensor at the bottom. The pressure sensor is electrically connected to the controller.

[0017] By adopting the above technical solution, the "U"-shaped positioning seat can effectively position and support the take-up roller, ensuring that the take-up roller maintains a stable position at the take-up station, preventing displacement during the take-up process, and ensuring the neatness of the film take-up. The elastic pad on the inner wall of the positioning seat can buffer the take-up roller when it is placed on the positioning seat, reducing collision damage between the take-up roller and the positioning seat. The pressure sensor can detect the pressure signal when the take-up roller is placed on the positioning seat and transmit the signal to the controller. The controller uses the pressure signal to determine whether the take-up roller is accurately placed. If it is not in place, it can issue a prompt signal or adjust the relevant actuators to ensure the correct installation of the take-up roller.

[0018] Optionally, the frame is provided with an electrostatic eliminator for eliminating static electricity from the film, the electrostatic eliminator being mounted above the guide roller.

[0019] By adopting the above technical solution, static electricity is easily generated during the production and transportation of the film due to friction with components such as guide rollers. Static electricity can cause the film to attract dust and stick together, affecting the quality of the film and subsequent processing. An electrostatic eliminator installed above the guide rollers can effectively eliminate static electricity on the film surface as it passes through the rollers, reducing the adverse effects of static electricity on film production and improving the product quality of the film.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a gripping roller mechanism, the automatic gripping, movement, and roll changing of the take-up roller are realized, eliminating the need for manual operation by staff, reducing labor intensity and labor costs; 2. By adopting a drive assembly consisting of a drive screw, a drive motor, and a drive block, the transmission accuracy is high and the operation is stable. It can accurately control the movement position of the mechanical gripper and ensure the accuracy of roll changing. 3. The use of positioning base and pressure sensor together ensures accurate installation and stable operation of the take-up roller at the take-up station, while the elastic pad layer plays a buffering and protective role; the setting of static eliminator effectively eliminates static electricity on the film surface and improves film quality. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of this application; Figure 2 This is a schematic diagram of the gripping roller mechanism in this application; Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0022] Reference numerals: 1. Frame; 11. Guide roller; 12. Rewinding station; 13. Rewinding roller; 14. Gripper ring; 15. Thickness sensor; 16. Controller; 17. Positioning seat; 18. Pressure sensor; 19. Static eliminator; 2. Gripper mechanism; 21. Moving frame; 22. Drive assembly; 23. Telescopic hydraulic cylinder; 24. Mechanical gripper; 25. Drive screw; 26. Drive motor; 27. Drive block; 31. Mounting base; 32. Claw hook; 33. Rotating assembly; 34. Rotating electric cylinder; 35. Mounting block; 36. Rotating shaft. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0024] This application discloses an export device for a blown film machine.

[0025] Reference Figure 1 The film blowing machine's output device includes a frame 1. Several guide rollers 11 for conveying film are rotatably mounted on the frame 1 via bearings, arranged sequentially along the film conveying direction. A winding station 12 is located at the end of the frame 1, where a winding roller 13 is rotatably mounted. The winding roller 13 is used to wind up the film conveyed by the guide rollers 11. A roller gripping mechanism 2 is also provided on the frame 1. The roller gripping mechanism 2 is used to grip the winding roller 13 and move it between the waiting position and the winding station 12, achieving automatic roll changing.

[0026] Reference Figure 1 and Figure 2 The gripping roller mechanism 2 includes a movable frame 21, a drive assembly 22, a telescopic hydraulic cylinder 23, and a mechanical gripper 24. The movable frame 21 is horizontally slidable on top of the frame 1 via a sliding rail that extends along the length of the frame 1. The drive assembly 22 is mounted on the frame 1 and drives the movable frame 21 to move horizontally along the sliding rail. The drive assembly 22 includes a drive screw 25, a drive motor 26, and a drive block 27. The drive screw 25 is rotatably mounted on the frame 1 via bearings and is parallel to the sliding rail. The drive motor 26 is bolted to one end of the frame 1, and its output shaft is fixedly connected to one end of the drive screw 25 via a coupling. The drive block 27 is threadedly connected to the drive screw 25 via a threaded hole, and its bottom is fixedly connected to the top of the movable frame 21. When the drive motor 26 drives the drive screw 25 to rotate, the drive block 27 can drive the movable frame 21 to move horizontally along the sliding rail.

[0027] Reference Figure 2The telescopic hydraulic cylinder 23 is vertically fixed to the outer wall of the movable frame 21 by bolts, and its piston rod is set vertically downward and can extend and retract vertically. The mechanical claw 24 is set at the bottom end of the piston rod of the telescopic hydraulic cylinder 23, and the mechanical claw 24 is used to grip the take-up roller 13.

[0028] Reference Figure 2 and Figure 3 The mechanical gripper 24 includes a mounting base 31, two claw hooks 32, and a rotating assembly 33. The mounting base 31 has a block-shaped structure, and its top is fixedly connected to the bottom end of the piston rod of the telescopic hydraulic cylinder 23. Both claw hooks 32 are rotatably mounted on the bottom of the mounting base 31 via pins. The claw hooks 32 are arranged in an "L" shape, with the rotation point of the claw hooks 32 located at their bends. The two claw hooks 32 are symmetrically arranged.

[0029] Reference Figure 3 A rotating assembly 33 is mounted on a mounting base 31. The rotating assembly 33 drives two claw hooks 32 to rotate synchronously in opposite directions. The rotating assembly 33 includes a rotating electric cylinder 34, a mounting block 35, and a rotating shaft 36. The rotating electric cylinder 34 is bolted to the bottom of the mounting base 31, with its piston rod pointing vertically downwards. The mounting block 35 has a block-like structure, with its top fixedly connected to the bottom end of the piston rod of the rotating electric cylinder 34. The rotating shaft 36 is rotatably mounted on the mounting block 35 via bearings, and the ends of the two claw hooks 32 closest to the rotating electric cylinder 34 are rotatably connected to the rotating shaft 36 via bearings.

[0030] Reference Figure 3 Both ends of the take-up roller 13 are fitted with gripping rings 14 through bearings. The outer side wall of the gripping ring 14 is provided with an annular groove. The size of the groove is adapted to the gripping end of the claw hook 32. When the mechanical claw 24 grips the take-up roller 13, the gripping end of the claw hook 32 can be inserted into the groove to achieve a firm grip on the take-up roller 13.

[0031] Reference Figure 2 A thickness sensor 15 is fixedly mounted on the side of the take-up roller 13 via a bracket on the frame 1. The thickness sensor 15 is a laser displacement sensor, with its emitting end facing the surface of the film being wound on the take-up roller 13, for real-time detection of the film winding thickness. A controller 16 is also fixedly mounted on the frame 1 via bolts. The controller 16 is a PLC controller. The thickness sensor 15, the drive motor 26, the control valve of the telescopic hydraulic cylinder 23, and the rotary electric cylinder 34 are all electrically connected to the controller 16 via wires. The thickness sensor 15 transmits the detected thickness signal to the controller 16, and the controller 16 controls the operation of each actuator according to a preset thickness threshold.

[0032] Reference Figure 2 and Figure 3A positioning seat 17 is bolted to the frame 1 at the winding station 12. The positioning seat 17 has a "U" shape with its opening facing upwards. The positioning seat 17 is used to position and support the winding roller 13, with both ends of the roller 13 placed within the "U"-shaped groove of the positioning seat 17. An elastic pad made of rubber is bonded to the inner wall of the positioning seat 17, providing good elasticity and cushioning performance. A pressure sensor 18 is bolted to the bottom of the positioning seat 17, with its detection end facing upwards and in contact with the end of the winding roller 13. The pressure sensor 18 is electrically connected to the controller 16 via a wire. The pressure sensor 18 detects the pressure signal from the winding roller 13 on the positioning seat 17 and transmits the signal to the controller 16.

[0033] Reference Figure 2 An electrostatic eliminator 19 is fixedly installed on the frame 1 above the guide roller 11 by a bracket. The electrostatic eliminator 19 adopts an ion air bar, and its air outlet faces the film surface on the guide roller 11. The electrostatic eliminator 19 is used to eliminate the static electricity generated by the film during the conveying process.

[0034] The working principle of this application embodiment is as follows: During normal operation of the blown film machine, the film is extruded from the die head and conveyed to the take-up roller 13 via several guide rollers 11. The take-up roller 13 rotates to wind up the film. During this process, the static eliminator 19 continuously eliminates static electricity from the film on the guide rollers 11; the thickness sensor 15 detects the winding thickness of the film on the take-up roller 13 in real time and transmits the thickness signal to the controller 16. When the film thickness reaches the preset threshold of the controller 16, the controller 16 determines that a roll change is required. First, it controls the take-up roller 13 to stop rotating, and then controls the drive motor 26 to start. The drive motor 26 drives the drive screw 25 to rotate, causing the drive block 27 to move the moving frame 21, the telescopic hydraulic cylinder 23, and the mechanical claw 24 to the empty take-up roller 13 at the waiting position.

[0035] Subsequently, the controller 16 controls the piston rod of the telescopic hydraulic cylinder 23 to extend and retract downwards, causing the mechanical claw 24 to approach the gripping ring 14 of the empty take-up roller 13. When the claw hook 32 moves to the slot, the controller 16 controls the piston rod of the rotary electric cylinder 34 to retract, causing the mounting block 35 to move upwards. The mounting block 35 drives the two claw hooks 32 to move upwards near the end of the rotary electric cylinder 34 through the rotating shaft 36, so that the two claw hooks 32 rotate synchronously in opposite directions around their respective rotation points, and the gripping ends approach each other and are clamped into the slot, clamping the empty take-up roller 13.

[0036] Next, the piston rod of the telescopic hydraulic cylinder 23 retracts upward, lifting the empty take-up roller 13. The drive motor 26 starts again, moving the moving frame 21 above the positioning seat 17 of the take-up station 12. The piston rod of the telescopic hydraulic cylinder 23 extends downward, placing the empty take-up roller 13 into the "U" groove of the positioning seat 17. The pressure sensor 18 detects the pressure signal and transmits it to the controller 16. After the controller 16 confirms that the take-up roller 13 is in place, it controls the piston rod of the rotating electric cylinder 34 to extend, driving the claw hook 32 to release the take-up roller 13. The piston rod of the telescopic hydraulic cylinder 23 retracts upward to reset. The drive motor 26 moves the moving frame 21 above the full take-up roller 13, repeating the above gripping action to transport the full take-up roller 13 to the designated storage position, completing one automatic roll change operation. The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A discharge device for a blown film machine, characterized in that: The device includes a frame (1) and a plurality of guide rollers (11) rotatably mounted on the frame (1). A take-up roller (13) is rotatably mounted at the end of the frame (1). A roller gripping mechanism (2) for gripping and moving the take-up roller (13) is provided on the frame (1). The roller gripping mechanism (2) includes: A movable frame (21) is horizontally slidably mounted on the frame (1); A drive assembly (22) is mounted on the frame (1) and is used to drive the moving frame (21) to move horizontally; Telescopic hydraulic cylinder (23), the telescopic hydraulic cylinder (23) is mounted on the movable frame (21), and the piston rod of the telescopic hydraulic cylinder (23) extends and retracts vertically; Mechanical claw (24), which is located at the bottom end of the piston rod of the telescopic hydraulic cylinder (23), is used to grip the take-up roller (13).

2. The ejector device for a blown film machine according to claim 1, characterized in that: The driving component (22) includes: A drive screw (25) is rotatably mounted on the frame (1) and is positioned horizontally. A drive motor (26) is mounted on the frame (1) and its output shaft is connected to the drive screw (25); The drive block (27) is horizontally slidably mounted on the frame (1) and threadedly connected to the drive screw (25). The telescopic hydraulic cylinder (23) is mounted on the drive block (27).

3. The outlet device of a blown film machine according to claim 1, characterized in that: The mechanical gripper (24) includes: Mounting base (31), which is located at the end of the piston rod of the telescopic hydraulic cylinder (23); Two claw hooks (32) are rotatably mounted on the mounting base (31). The claw hooks (32) are arranged in an "L" shape, and the rotation point of the claw hooks (32) is located at their bend. Rotating assembly (33) is mounted on mounting base (31) and is used to drive two claw hooks (32) to rotate synchronously in opposite directions.

4. The ejector device for a blown film machine according to claim 3, characterized in that: The rotating assembly (33) includes: A rotating electric cylinder (34) is mounted on a mounting base (31); Mounting block (35), said mounting block (35) is mounted on the piston rod of rotating electric cylinder (34); A rotating shaft (36) is rotatably mounted on a mounting block (35), and the two claw hooks (32) are rotatably connected to the rotating shaft (36) at one end near the rotating electric cylinder (34).

5. The ejector device for a blown film machine according to claim 3, characterized in that: Both ends of the take-up roller (13) are provided with gripping rings (14) that rotate through bearings. The outer side wall of the gripping ring (14) is provided with a slot for the claw hook (32) to be engaged.

6. The ejector device for a blown film machine according to claim 4, characterized in that: The frame (1) is provided with a thickness sensor (15) for detecting the winding thickness of the take-up roller (13). The thickness sensor (15) is a laser displacement sensor. The thickness sensor (15) is located on the side of the take-up roller (13). The thickness sensor (15) is used to detect the thickness of the film winding in real time. The frame (1) is also provided with a controller (16). The thickness sensor (15), drive motor (26), telescopic hydraulic cylinder (23) and rotary electric cylinder (34) are all electrically connected to the controller (16).

7. The ejector device for a blown film machine according to claim 6, characterized in that: The frame (1) is provided with a positioning seat (17) for positioning the take-up roller (13) at the take-up station (12). The positioning seat (17) is arranged in a "U" shape. An elastic pad is provided on the inner wall of the positioning seat (17). A pressure sensor (18) is provided at the bottom of the positioning seat (17). The pressure sensor (18) is electrically connected to the controller (16).

8. The outlet device of a blown film machine according to claim 1, characterized in that: The frame (1) is provided with an electrostatic eliminator (19) for eliminating static electricity from the film, and the electrostatic eliminator (19) is installed above the guide roller (11).

Images