Tension balancing and smoothing device of plastic film production machine

Abstract

The utility model discloses a tension balancing and smoothing device of a plastic film production machine. The tension balancing and smoothing device comprises a base and a support. Frames are symmetrically and fixedly installed on the two sides of the top of the base, a connecting plate is transversely and fixedly welded to the top of the support, three movable rods are vertically and fixedly installed on the top of the connecting plate and are in sliding fit with guide holes in the tops of the frames respectively, and the support is installed on the inner sides of the frames in a liftable mode through the movable rods. The smoothing roller is rotatably installed in the middle of the lower portion of the inner side of the support through a bearing, and the rotating shafts are rotatably installed on the front side and the rear side of the support through bearings. According to the plastic film flattening device, precise balance and efficient flattening of plastic film tension can be achieved through an electric push rod and magnetic positioning precise lifting structure, cooperative transmission of the conveying roller and the flattening roller, dynamic pressure adjustment of the lower pressing roller and a tension closed-loop control system, and the problems that in a traditional device, tension adjustment is not precise, and the flattening effect is poor are solved; and the stability and the product quality of plastic film production are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic film production, especially to a tension balance smoothing device of plastic film production machine. BACKGROUND

[0002] In the plastic film production process, the tension balance and flatness of the plastic film play a crucial role in product quality. If the tension control is improper, the plastic film is prone to wrinkles, stretching deformation or breakage, which seriously affects subsequent processing and product performance.

[0003] Traditional plastic film production machines usually use fixed pressure rollers or simple mechanical adjusting devices to control tension, but these devices have obvious defects:

[0004] Traditional devices are mostly manually or semi-manually adjusted, making it difficult to dynamically adjust the pressure in real time according to the thickness, material or production speed of the plastic film, resulting in large tension fluctuations, especially during high-speed production or material changes, which cannot guarantee stable tension.

[0005] Secondly, some devices rely solely on a single roller for smoothing, which is not effective in dealing with wrinkles or unevenness on the surface of the plastic film, and is prone to leaving defects, affecting product appearance and quality.

[0006] Moreover, the traditional smoothing rollers are fixedly connected with the lifting mechanism, which is not convenient for quick disassembly and maintenance of the smoothing roller and the lifting mechanism.

[0007] Therefore, how to provide a tension balance smoothing device for a plastic film production machine is a problem that needs to be solved by those skilled in the art. INVENTION CONTENTS

[0008] One purpose of the utility model is to provide a tension balance smoothing device for a plastic film production machine. The utility model can achieve precise balance and efficient smoothing of the plastic film tension through the precise lifting structure of the electric push rod and magnetic positioning, the coordinated transmission of the conveying roller and the smoothing roller, the dynamic pressure adjustment of the lower pressing roller, and the tension closed-loop control system, solving the problem of inaccurate tension adjustment and poor smoothing effect in traditional devices, and improving the stability of plastic film production and product quality.

[0009] According to the tension balance smoothing device for a plastic film production machine, the bottom of the frame is fixedly connected with the lifting mechanism, the lifting mechanism is connected with the tension balance smoothing device, and the tension balance smoothing device is connected with the lifting mechanism through the lifting mechanism.

[0010] The frame top is fixedly connected with the connecting plate, and the connecting plate top is vertically fixedly connected with three groups of movable rods.

[0011] The inside of the bracket is centrally provided with a smoothing roller rotatably mounted through a bearing, and the front and rear sides of the bracket are respectively provided with a rotating shaft rotatably mounted through a bearing, the rotating shaft extends out of the bracket at both ends and is fixedly connected with a swing arm, and the bottom end of the swing arm is rotatably mounted with a pressing roller through a pin shaft;

[0012] The outer wall of the bracket is rotatably mounted with a rotating disc through a bearing on both sides, one end of the rotating shaft penetrates through the bracket and is placed in the rotating disc, a clock spring is fixedly installed on the inner wall of the rotating disc, and the other end of the clock spring is fixedly connected with the outer wall of the rotating shaft;

[0013] The top of the bracket is fixedly installed with a servo motor on both ends and close to the side of the rotating disc, the output shaft of the servo motor is drivingly connected with a gear through a shaft coupling, and the outer wall of the rotating disc is provided with a gear block meshing with the gear.

[0014] Further, a portal frame is fixedly installed on the top of the frame, three groups of electric push rods are vertically fixedly installed on the top of the portal frame, an electromagnet is fixedly installed on the bottom of the piston rod of the electric push rod, a metal disc is fixedly installed on the top of the movable rod corresponding to the position of the electromagnet, the electromagnet and the metal disc are magnetically attracted and matched by driving the electromagnet through the electric push rod, and the lifting positioning of the bracket is realized.

[0015] Further, a protective cover is detachably installed on the outside of the rotating disc through bolts, an annular groove matching the outer peripheral surface of the rotating disc is arranged on the inner wall of the protective cover, and the clock spring and the gear transmission mechanism inside the rotating disc are protected.

[0016] Further, the clock spring is a constant force spring, one end of the clock spring is fixed to the inner wall of the rotating disc through a screw, the other end of the clock spring is fixedly connected with the outer wall of the rotating shaft through a pin shaft, and the pre-tightening force of the clock spring can be adjusted by adjusting the initial installation angle between the rotating disc and the bracket.

[0017] Further, the servo motor and the gear are drivingly connected through an elastic shaft coupling, the modulus and the number of teeth of the gear and the gear block are matched, and the transmission accuracy and stability are ensured.

[0018] Further, the metal disc is of an annular structure, the outer diameter of the metal disc is greater than the outer diameter of the electromagnet, and a rubber buffer layer is arranged on the top of the metal disc for reducing the impact force when the electromagnet and the metal disc are magnetically attracted.

[0019] Further, a silica gel sleeve is sleeved on the roller surface of the pressing roller, a grid-shaped anti-skid pattern is arranged on the surface of the silica gel sleeve, the depth of the anti-skid pattern is 0.5-1mm, and the smoothing effect on the plastic film is enhanced.

[0020] Further, a tension sensor is arranged on the inside of the bracket, and the tension sensor is electrically connected with the servo motor, the tension value of the plastic film is monitored in real time, the rotating speed of the servo motor is feedback controlled, and the dynamic balance of the tension is realized.

[0021] The utility model discloses the beneficial effect is:

[0022] 1, the utility model discloses the linkage adjustable pressure size of lower pressure roller through swing arm, pivot and carousel, clock spring and servo motor, can therefore adjust pressure according to plastic film tension in real time, servo motor drive gear and tooth block transmission, the rotation angle of carousel is accurately controlled, and then the torque of clock spring is adjusted, and the pressure of lower pressure roller to plastic film is dynamically adapted, the problem that traditional fixed pressure device cannot adapt to plastic film of different thickness or material quality is solved, and the accuracy of tension balance is ensured.

[0023] 2, the utility model discloses the magnetic attraction cooperation of adopting electric push rod and electromagnet, metal disc, combines the sliding guide structure of three groups of movable bars and frame, can accurately control the lifting height of support, and after positioning, through magnetic attraction locking, ensure that the support keeps stable under different working conditions, after power off, the support and the flattening roller can be conveniently lifted upwards, convenient film operation, compared with traditional mechanical lifting structure, the design significantly improves the accuracy and reliability of height adjustment, avoids the problem of uneven plastic film tension caused by support shaking. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0025] Figure 1 It is the whole structure schematic diagram of tension balance flattening device of plastic film production machine that the utility model proposes;

[0026] Figure 2 It is the support side view structure schematic diagram of tension balance flattening device of plastic film production machine that the utility model proposes;

[0027] Figure 3 It is the protection dismantling structure schematic diagram of tension balance flattening device of plastic film production machine that the utility model proposes;

[0028] Figure 4 It is the A local enlarged structure schematic diagram of tension balance flattening device of plastic film production machine that the utility model proposes.

[0029] In the drawing: 1, base;2, frame;3, movable bar;4, metal disc;5, portal;6, electric push rod;7, electromagnet;8, connecting plate;9, support;10, conveying roller;11, flattening roller;12, pivot;13, swing arm;14, lower pressure roller;15, carousel;16, servo motor;17, gear;18, tooth block;19, clock spring;20, protective cover. DETAILED DESCRIPTION

[0030] The utility model will be further explained in detail in connection with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the components related to the utility model.

[0031] Example one

[0032] Referring to Figures 1-4 The utility model provides a tension balance smoothing device of plastic film production machine, including base 1 and support 9, base 1 top two sides symmetry fixed mounting frame 2, two frame 2 are parallelly arranged, provide the vertical direction guide for the overall device, and support 9 is liftablely installed in the inboard of frame 2 through connecting plate 8 and movable rod 3.

[0033] Specifically, support 9 top transverse fixed welding connecting plate 8, three groups movable rod 3 are vertically fixed on connecting plate 8, frame 2 top is provided with guide hole corresponding the position of movable rod 3, movable rod 3 penetrates guide hole and with frame 2 sliding fit, form stable lifting guide structure, for further promote the accuracy of lifting drive and positioning locking, frame 2 top fixed door frame 5, three groups electric push rod 6 are vertically installed on door frame 5 top, the piston rod bottom of electric push rod 6 is fixed with electromagnet 7, and the top of movable rod 3 is fixed with metal disc 4 opposite the position of electromagnet 7, when electric push rod 6 telescopes, electromagnet 7 can be magnetically attracted or separated with metal disc 4, to realize the lifting drive and positioning locking of support 9.

[0034] This embodiment ensures the accurate lifting and positioning of support 9 through the linear drive of electric push rod 6 and the magnetic attraction of electromagnet 7 and metal disc 4. The sliding guide structure of three groups of movable rods 3 and frame 2 ensures the stability of the lifting process.

[0035] Example two

[0036] On the basis of example one, as Figures 1-4 shown, smoothing roller 11 is arranged centrally below the inboard of support 9, serving as the main smoothing component of the plastic film. Smoothing roller 11 is rotatably mounted on the inboard of support 9 through a bearing, and its axis is consistent with the transmission direction of the plastic film.

[0037] A conveying roller 10 is arranged below smoothing roller 11 on the inboard of frame 2. Conveying roller 10 is rotatably mounted on frame 2 through a bearing, and its axis is also consistent with the transmission direction of the plastic film. The plastic film passes between conveying roller 10 and smoothing roller 11, and the two cooperate to achieve the conveying and preliminary smoothing of the plastic film.

[0038] The front and back sides of the support 9 are respectively rotatably installed with the rotating shaft 12 through bearings, the axis of the rotating shaft 12 is parallel to the smoothing roller 11, the two ends of the rotating shaft 12 extend out of the support 9 and are fixedly connected with the swing arm 13, the bottom end of the swing arm 13 is rotatably installed with the lower pressing roller 14 through a pin shaft, the lower pressing roller 14 is arranged in correspondence with the smoothing roller 11. Through the swing of the swing arm 13, the roller surface distance between the lower pressing roller 14 and the smoothing roller 11 can be adjusted, so as to exert pressure on the plastic film to ensure the tension balance of the film.

[0039] In this embodiment, the cooperation of the conveying roller 10 and the smoothing roller 11 realizes the transmission and preliminary smoothing of the plastic film, and the linkage design of the rotating shaft 12 and the swing arm 13 ensures the flexibility of the pressure adjustment of the lower pressing roller 14 to maintain the tension balance of the plastic film.

[0040] Embodiment Three

[0041] On the basis of Embodiment Two, as shown in Figures 1-4 The outer wall of the support 9 is provided with a pressure adjusting mechanism composed of a rotating disc 15 and a clockwork spring 19, the rotating disc 15 is rotatably installed on the outer wall of the support 9 through a bearing, the rotating axis of the rotating disc 15 coincides with the axis of the rotating shaft 12, one end of the rotating shaft 12 penetrates the rear of the support 9 and extends into the interior of the rotating disc 15 and is fixedly connected with the rotating disc 15, the clockwork spring 19 is fixedly installed on the inner wall of the rotating disc 15, the other end of the clockwork spring 19 is fixedly connected with the outer wall of the rotating shaft 12, when the rotating disc 15 rotates, the clockwork spring 19 is wound or released, thereby generating a torque acting on the rotating shaft 12.

[0042] In order to realize the accurate control of the torque, a servo motor 16 is fixedly installed on one side of the top of the support 9 close to the rotating disc 15, the output shaft of the servo motor 16 is drivingly connected with a gear 17 through a coupling, and the outer wall of the rotating disc 15 is provided with a tooth block 18 meshing with the gear 17, when the servo motor 16 drives the gear 17 to rotate, the rotating disc 15 is driven to rotate through the tooth block 18, thereby adjusting the tightness of the clockwork spring 19 and realizing the dynamic adjustment of the torque of the rotating shaft 12.

[0043] This embodiment realizes the accurate control of the pressure of the lower pressing roller 14 through the cooperation of the servo motor 16, the gear 17, the tooth block 18 and the clockwork spring 19, thereby improving the adaptability of the device to maintain the tension balance of the plastic film.

[0044] Embodiment Four

[0045] On the basis of Embodiment Three, as shown in Figures 1-4 The outer side of the rotating disc 15 is detachably installed with a protective cover 20 through bolts, the protective cover 20 is circular, the inner wall of the protective cover 20 is provided with an annular groove matching the outer peripheral surface of the rotating disc 15, which can protect the clockwork spring 19 and the gear 17 transmission mechanism in the interior and does not hinder the normal rotation of the rotating disc 15.

[0046] The elastic coupling is arranged between the servo motor 16 and the gear 17, so as to compensate installation error and absorb transmission vibration, and ensure the meshing precision of the gear 17 and the tooth block 18.

[0047] Further, the roller surface of the pressing roller 14 is sleeved with a silica gel sleeve, the surface of the silica gel sleeve is provided with a grid-shaped anti-skid line with a depth of 0.5-1mm, so as to enhance the friction force on the plastic film and prevent indentation, the inside of the support 9 is provided with a tension sensor, the tension value of the plastic film is monitored in real time, the tension sensor is electrically connected with the servo motor 16, a closed-loop control system is formed, the rotating speed of the servo motor 16 can be dynamically adjusted according to the tension feedback, so as to accurately control the pressure of the pressing roller 14, and the balance of the tension of the plastic film is realized.

[0048] The embodiment improves the reliability of the device through the protective cover 20 and the elastic coupling, the silica gel sleeve and the anti-skid line optimize the effect of the pressing roller 14 on the plastic film, and the closed-loop control of the tension sensor and the servo motor realizes the self-adaptive adjustment of the pressure, so as to ensure the tension stability of the plastic film under different working conditions.

[0049] Working principle: if the height of the support 9 needs to be adjusted after the device is started, the extension and retraction of the electric push rod 6 is controlled to realize the adjustment, when the piston rod of the electric push rod 6 extends, the electromagnet 7 at the bottom thereof is magnetically attracted to the metal disc 4 at the top of the movable rod 3, since the movable rod 3 is fixedly connected with the connecting plate 8 and the support 9, and the movable rod 3 is in sliding fit with the guide hole of the frame 2, the electric push rod 6 pushes the support 9 to rise; on the contrary, when the piston rod retracts, the electromagnet 7 is separated from the metal disc 4, and the support 9 descends under the action of gravity, the synchronous action of the three groups of electric push rods 6 cooperates with the magnetic attraction positioning of the electromagnet 7 and the metal disc 4, to ensure the accurate lifting and locking of the support 9, and the sliding guide of the three groups of movable rods 3 and the frame 2 guarantees the stability during the lifting process, after the plastic film enters the device, the transmission power is provided by the conveying roller 10 at the lower side of the inner side of the frame 2, the conveying roller 10 is rotatably installed in the frame 2 through a bearing, the axis line thereof is consistent with the plastic film transmission direction, to drive the plastic film to move forward, at the same time, the smoothing roller 11 at the lower side of the inner side of the support 9 is matched with the conveying roller 10, to preliminarily smooth the plastic film, the smoothing roller 11 is installed in the support 9 through a bearing, to form a clamping channel with the conveying roller 10, when the plastic film passes between the two, the roller surface of the smoothing roller 11 acts on the surface of the plastic film, to eliminate the wrinkles or unevenness on the surface thereof, in order to ensure the balance of the plastic film tension, the lower pressing roller 14 on both sides of the support 9 is linked with the rotating shaft 12 through the swing arm 13, when the pressure needs to be adjusted, the servo motor 16 drives the gear 17 to rotate, the gear 17 is engaged with the tooth block 18 on the outer wall of the rotating disc 15, to drive the rotating disc 15 to rotate, the clock spring 19 in the inner wall of the rotating disc 15 is fixed at one end to the rotating disc 15, and at the other end to the rotating shaft 12, the rotation of the rotating disc 15 makes the clock spring 19 wind or release, to generate a torque acting on the rotating shaft 12, and then drive the swing arm 13 to swing, to adjust the distance between the lower pressing roller 14 and the smoothing roller 11, by controlling the rotating speed and direction of the servo motor 16, the tightness of the clock spring 19 can be accurately adjusted, to realize the dynamic control of the pressure of the lower pressing roller 14, so as to balance the tension of the plastic film, the tension sensor at the inner side of the support 9 monitors the tension value of the plastic film in real time, and feeds back the signal to the control system, the control system automatically adjusts the rotating speed of the servo motor 16 according to the deviation between the preset tension value and the actual monitoring value, dynamically corrects the pressure of the lower pressing roller 14 through the pressure adjusting mechanism, so that the plastic film tension returns to the set value, to form a closed loop control, in addition, the surface of the silica gel sleeve of the lower pressing roller 14 is provided with a grid-shaped anti-skid pattern, to enhance the friction force on the plastic film and prevent indentation; the protective cover 20 at the outer side of the rotating disc 15 protects the internal transmission mechanism, and the elastic coupling compensates for the installation error, to ensure the transmission stability.

[0050] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A tension balancing and smoothing device for a plastic film production machine, characterized in that, Includes a base (1) and a bracket (9); The base (1) has a frame (2) symmetrically fixed on both sides of the top. The bracket (9) has a connecting plate (8) horizontally fixed on the top. The connecting plate (8) has three sets of movable rods (3) vertically fixed on the top. The three sets of movable rods (3) slide with the guide holes on the top of the frame (2) respectively, so that the bracket (9) can be installed in the inner side of the frame (2) through the movable rods (3). A smoothing roller (11) is rotatably mounted on the lower inner side of the bracket (9) via a bearing. A conveying roller (10) is arranged parallel to the inner side of the frame (2) and below the smoothing roller (11). A rotating shaft (12) is rotatably mounted on the front and rear sides of the bracket (9) via bearings. The two ends of the rotating shaft (12) extend out of the bracket (9) and are fixedly connected to the swing arm (13). A lower pressure roller (14) is rotatably mounted on the bottom end of the swing arm (13) via a pin. The bracket (9) has a turntable (15) rotatably mounted on both sides of its outer wall via bearings. One end of the rotating shaft (12) passes through the bracket (9) and is placed inside the turntable (15). A spring-loaded spring (19) is fixedly mounted on the inner wall of the turntable (15). The other end of the spring-loaded spring (19) is fixedly connected to the outer wall of the rotating shaft (12). Servo motors (16) are fixedly installed at both ends of the top of the bracket (9) and on the side near the turntable (15). The output shaft of the servo motor (16) is connected to the gear (17) via a coupling. The outer wall of the turntable (15) is surrounded by tooth blocks (18) that mesh with the gear (17).

2. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, A gantry (5) is fixedly installed on the top of the frame (2). Three sets of electric push rods (6) are vertically fixedly installed on the top of the gantry (5). An electromagnet (7) is fixedly installed at the bottom of the piston rod of the electric push rod (6). A metal disc (4) is fixedly installed on the top of the movable rod (3) at the position corresponding to the electromagnet (7). The electric push rod (6) drives the electromagnet (7) to magnetically engage with the metal disc (4) to achieve the lifting and positioning of the bracket (9).

3. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, The turntable (15) is detachably mounted with a protective cover (20) on its outer side by bolts. The inner wall of the protective cover (20) is provided with an annular groove that matches the outer circumferential surface of the turntable (15) to protect the clock spring (19) and gear (17) transmission mechanism inside the turntable (15).

4. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, The spring (19) is a constant force spring. One end of it is fixed to the inner wall of the turntable (15) by a screw, and the other end is fixedly connected to the outer wall of the rotating shaft (12) by a pin. The preload of the spring (19) can be adjusted by adjusting the initial installation angle between the turntable (15) and the bracket (9).

5. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, The servo motor (16) and the gear (17) are connected by a flexible coupling. The gear (17) and the gear block (18) are matched in terms of module and number of teeth to ensure transmission accuracy and smoothness.

6. The tension balancing and smoothing device for a plastic film production machine according to claim 2, characterized in that, The metal disk (4) has a ring structure and its outer diameter is larger than that of the electromagnet (7). A rubber buffer layer is provided on the top of the metal disk (4) to reduce the impact force when the electromagnet (7) and the metal disk (4) are magnetically attracted.

7. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, The roller surface of the lower pressure roller (14) is fitted with a silicone sleeve. The surface of the silicone sleeve is provided with a grid-like anti-slip texture, and the depth of the anti-slip texture is 0.5-1mm, which is used to enhance the smoothing effect on the plastic film.

8. The tension balancing and smoothing device for a plastic film production machine according to claim 1, characterized in that, A tension sensor is provided inside the bracket (9), and the tension sensor is electrically connected to the servo motor (16). By monitoring the tension value of the plastic film in real time, the rotation speed of the servo motor (16) is controlled to achieve dynamic tension balance.

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