Plastic film tensioning device for winding machine

Abstract

The utility model belongs to the field of plastic film production equipment, and relates to a plastic film tensioning device for a winding machine, which comprises an inverted L-shaped support frame, a winding roller and two groups of tensioning assemblies fixed at the bottom of the inverted L-shaped support frame, the tensioning assembly comprises a first pressing wheel arranged in an inclined mode, a second pressing wheel arranged above the first pressing wheel, a mounting groove used for fixing the first pressing wheel, and an adjusting wheel hinged to the second pressing wheel through a hinge and located on one side of the mounting groove. In the moving process of the plastic film, friction is generated between the first pressing wheel and the second pressing wheel and the plastic film, the friction enables the plastic film to drive the first pressing wheel and the second pressing wheel to rotate, in the rotating process of the first pressing wheel and the second pressing wheel, oblique outward driving force can be generated on the plastic film, and in the forward moving process of the plastic film, the plastic film is prevented from falling off. And the plastic film has the outward expansion tendency of moving leftwards and rightwards, so that the plastic film always has certain tensile force, the plastic film is flattened and unfolded, and wrinkles are avoided.

Description

Technical Field

[0001] The present application belongs to the field of plastic film production equipment, and in particular, relates to a plastic film tensioning device for a winding machine. Background Art

[0002] Plastic film is a kind of plastic product widely used in packaging, agriculture, construction and other fields. It is light, flexible, transparent, water-resistant, acid-resistant and alkali-resistant, and has good moisture-proof, dust-proof, fresh-keeping and heat-insulating functions. At present, the mainstream plastic films on the market are mainly polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), etc. The production of plastic film requires equipment such as mixers, extruders, winders, air compressors, etc.

[0003] Since the width of the winder is generally more than five meters, the plastic film is difficult to flatten after entering the winder, so the plastic film has wrinkles during the winding process. Utility Model Content

[0004] In order to overcome the problems existing in the background technology, the present application provides a plastic film tensioning device for a winding machine, which aims to solve the problem of wrinkles in the plastic film during the winding process.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] A plastic film tensioning device for a winding machine comprises a ⊔-shaped support frame and a winding roller, wherein the plastic film tensioning device for the winding machine further comprises a tensioning assembly fixed at the bottom of the ⊔-shaped support frame, wherein two groups of tensioning assemblies are symmetrically arranged;

[0007] The tensioning assembly includes a first pressing wheel arranged obliquely, a second pressing wheel arranged above the first pressing wheel, a mounting groove for fixing the first pressing wheel, and an adjusting wheel hingedly connected to the second pressing wheel by a hinge and located on one side of the mounting groove;

[0008] The bottom of the mounting groove is fixedly connected to the bottom of the ⊔-shaped support frame, the adjusting wheel is fixed to the support frame through a connecting rod, the top of the second pressing wheel is away from the middle of the ⊔-shaped support frame, and the bottom of the first pressing wheel is close to the middle of the ⊔-shaped support frame;

[0009] Initially, the first pressing wheel and the second pressing wheel press against each other, and a gap is formed at the pressing position to allow the plastic film to pass through.

[0010] Optionally, two ends of the pressing wheel shaft of the first pressing wheel are rotatably connected to two sides of the mounting groove respectively.

[0011] Optionally, an inclined rod extends outwardly from the pressing wheel shaft of the second pressing wheel, the inclined rod is fixedly connected to the hinge of the adjusting wheel, and the hinge is rotatably connected to the center part of the adjusting wheel.

[0012] Optionally, the adjusting wheel can drive the second pressing wheel to shift its position so that the second pressing wheel moves away from or closer to the first pressing wheel.

[0013] Optionally, the first pressing wheel and the second pressing wheel are axially positioned by a locking nut, and the first pressing wheel and the second pressing wheel are radially positioned by a flat key.

[0014] Optionally, the winding roller spans the middle of the ⊔-shaped support frame and is located behind the tensioning assembly, and the two ends of the winding roller are rotatably connected to the two sides of the ⊔-shaped support frame respectively. The winding roller is used to receive and wind up the plastic film from the tensioning assembly.

[0015] Optionally, the roller shaft of the winding roller is connected to the output end of the motor.

[0016] Beneficial effects of the present application: The present application generates friction between the first pressure wheel, the second pressure wheel and the plastic film during the movement of the plastic film, and the friction causes the plastic film to drive the first pressure wheel and the second pressure wheel to rotate. Since the hub end faces of the first pressure wheel and the second pressure wheel are inclined relative to the vertical plane, the first pressure wheel and the second pressure wheel have an oblique outward linear velocity during the rotation process, and the linear velocity will generate an oblique outward driving force on the plastic film, so that the plastic film has an outward expansion tendency to move leftward and rightward during the forward movement, so that the plastic film always has a certain tensioning force, thereby flattening the plastic film and avoiding the formation of wrinkles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the main view of this application;

[0018] Figure 2 It is a structural schematic diagram of the tensioning assembly of the present application in a working state;

[0019] Figure 3 It is the force diagram of the plastic film of the present application;

[0020] Figure 4 It is a structural schematic diagram of the tensioning assembly of the present application in a resting state.

[0021] In the figure, 1 is a ⊔-shaped support frame 1, 2 is a winding roller, 3 is a tensioning assembly, 4 is a plastic film, 30 is a first pressing wheel, 31 is a second pressing wheel, 32 is a mounting groove, 33 is an adjusting wheel, 311 is an inclined rod, and 331 is a connecting rod. DETAILED DESCRIPTION

[0022] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific situation.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0027] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0028] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0029] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technical personnel.

[0030] Embodiment 1:

[0031] See also Figures 1 to 3 , a plastic film tensioning device for a winding machine, comprising a ⊔-shaped support frame 1 and a winding roller 2, the plastic film tensioning device for the winding machine also includes a tensioning assembly 3 fixed at the bottom of the ⊔-shaped support frame 1, and the tensioning assembly 3 is symmetrically arranged in two groups;

[0032] The tensioning assembly 3 includes a first pressing wheel 30 disposed obliquely, a second pressing wheel 31 disposed above the first pressing wheel 30, a mounting groove 32 for fixing the first pressing wheel 30, and an adjusting wheel 33 hingedly connected to the second pressing wheel 31 through a hinge and located on one side of the mounting groove 32;

[0033] The bottom of the mounting groove 32 is fixedly connected to the bottom of the ⊔-shaped support frame 1, the adjusting wheel 33 is fixed to the support frame 1 through the connecting rod 331, the top of the second pressing wheel 31 is away from the middle of the ⊔-shaped support frame 1, and the bottom of the first pressing wheel 30 is close to the middle of the ⊔-shaped support frame 1;

[0034] Initially, the first pressing wheel 30 and the second pressing wheel 31 press against each other, and a gap is formed at the pressing position to allow the plastic film 4 to pass through.

[0035] The top of the second pressure wheel 31 is far away from the middle of the ⊔-shaped support frame 1, and the bottom of the first pressure wheel 30 is close to the middle of the ⊔-shaped support frame 1, so that the hub end faces of the first pressure wheel 30 and the second pressure wheel 31 have a certain angle with the vertical plane, that is, the wheel axle axes of the first pressure wheel 30 and the second pressure wheel 31 are parallel to each other, and the wheel axle axes of the first pressure wheel 30 and the second pressure wheel 31 intersect with the roller axis of the winding roller 2.

[0036] The material of the plastic film 4 has a certain toughness, and the pressing of the first pressing wheel 30 and the second pressing wheel 31 on the plastic film 4 will not affect the quality of the plastic film 4 .

[0037] Working process: The middle and rear part of the plastic film 4 is pressed in the gap formed by the first pressing wheel 30 and the second pressing wheel 31, and the front part of the plastic film 4 is sleeved on the winding roller 2. The winding roller 2 rotates, and the plastic film 4 is driven by the front driving force brought by the rotation of the winding roller 2 at a speed v (such as Figure 3 As shown in the figure, the first pressing wheel 30, the second pressing wheel 31 and the plastic film 4 move forward, and friction is generated between the first pressing wheel 30, the second pressing wheel 31 and the plastic film 4. The friction causes the plastic film 4 to drive the first pressing wheel 30 and the second pressing wheel 31 to rotate. Since the hub end faces of the first pressing wheel 30 and the second pressing wheel 31 are inclined relative to the vertical plane, the first pressing wheel 30 and the second pressing wheel 31 have an oblique outward linear velocity v1 during the rotation process. The linear velocity v1 will generate an oblique outward driving force F (as shown in the figure) on the plastic film 4. Figure 3 As shown in the figure, the plastic film 4 has a tendency to expand to the left and right during the forward movement, so that the plastic film 4 always has a certain tension, thereby making the plastic film 4 flat and unfolded to avoid the generation of wrinkles.

[0038] Embodiment 2:

[0039] See also Figure 2 and Figure 4 The two ends of the pressing wheel shaft of the first pressing wheel 30 are rotatably connected to the two sides of the mounting groove 32 respectively.

[0040] Through holes are provided on both sides of the mounting groove 32 to allow the pressure wheel shaft of the first pressure wheel 30 to pass through. The first pressure wheel 30 is installed in the mounting groove 32 through the through holes, and the pressure wheel shaft of the first pressure wheel 30 can rotate freely at the through holes, so that the first pressure wheel 30 can rotate freely in the mounting groove 32.

[0041] An inclined rod 311 extends outwardly from the pressing wheel axis of the second pressing wheel 31 . The inclined rod 311 is fixedly connected to a hinge of the adjusting wheel 33 . The hinge is rotatably connected to the center of the adjusting wheel 33 .

[0042] A bearing (not shown in the figure) is provided on the pressure wheel shaft of the second pressure wheel 31, and the inner ring of the bearing is fixed to the pressure wheel shaft. The inclined rod 311 is a hollow structure, and the outer ring of the bearing and the inclined rod 311 are fixed. When the second pressure wheel 31 rotates, the inner ring of the bearing rotates with the second pressure wheel 31. Since the outer ring of the bearing is fixed, the inclined rod 311 will not rotate with the rotation of the pressure wheel shaft of the second pressure wheel 31.

[0043] The adjusting wheel 33 can drive the second pressing wheel 31 to shift its position, so that the second pressing wheel 31 moves away from or close to the first pressing wheel 30 .

[0044] Apply a force to the inclined rod 311, so that the inclined rod 311 rotates along the center of the adjusting wheel 33 through the hinge, thereby driving the second pressing wheel 31 to rotate around the adjusting wheel 33, and then the second pressing wheel 31 moves away from or close to the first pressing wheel 30;

[0045] The inclined rod 311 rotates counterclockwise, driving the second pressure wheel 31 to approach the first pressure wheel 30 until the first pressure wheel 30 and the second pressure wheel 31 are pressed against each other, and the plastic film 4 is tightly pressed in the gap formed by the first pressure wheel 30 and the second pressure wheel 31. As the winding roller 2 rotates, the plastic film 4 is flattened and unfolded, and the wrinkles disappear. After the winding operation is completed, the inclined rod 311 is rotated clockwise to drive the second pressure wheel 31 away from the first pressure wheel 30, and the tensioning assembly 3 stops running.

[0046] The first pressing wheel 30 and the second pressing wheel 31 are axially positioned by a locking nut, and the first pressing wheel 30 and the second pressing wheel 31 are radially positioned by a flat key.

[0047] Since the pressure wheel shafts of the first pressure wheel 30 and the second pressure wheel 31 are arranged at an angle, the pressure wheel bodies of the first pressure wheel 30 and the second pressure wheel 31 are easily moved. The first pressure wheel 30 and the second pressure wheel 31 are axially positioned by a locking nut to avoid axial movement of the pressure wheel bodies. Radially positioned by a flat key, the pressure wheel body can drive the pressure wheel shaft to rotate synchronously.

[0048] The winding roller 2 spans across the middle of the ⊔-shaped support frame 1 and is located behind the tensioning assembly 3. The two ends of the winding roller 2 are rotatably connected to the two side edges of the ⊔-shaped support frame 1 respectively. The winding roller 2 is used to receive and wind up the plastic film 4 from the tensioning assembly 3.

[0049] Through holes are provided on the two side edges of the ⊔-shaped support frame 1 to allow the roller shaft of the winding roller 2 to pass through. The winding roller 2 is installed on the ⊔-shaped support frame 1 through the through holes. The roller shaft of the winding roller 2 can rotate freely at the through holes, so that the winding roller 2 can rotate freely in the ⊔-shaped support frame 1.

[0050] After being flattened, unfolded and tensioned by the tensioning assembly 3 , the plastic film 4 is rolled into a cylindrical shape by the rotation of the winding roller 2 .

[0051] Before the winding operation begins, the inclined rod 311 is rotated so that the gap between the first pressure wheel 30 and the second pressure wheel 31 can easily accommodate the plastic film 4. The front part of the plastic film 4 passes through the gap to reach the winding roller 2 and is sleeved on the winding roller 2. The winding roller 2 is then started to perform the winding operation.

[0052] The roller shaft of the winding roller 2 is connected to the output end of the motor.

[0053] The motor is used to drive the winding roller 2 to rotate.

[0054] The working process of the present application is as follows: rotate the inclined rod 311 so that the gap between the first pressure wheel 30 and the second pressure wheel 31 can easily accommodate the plastic film 4, and the front part of the plastic film 4 passes through the gap to reach the winding roller 2 and is sleeved on the winding roller 2, and rotate the inclined rod 311 again to make the first pressure wheel 30 and the second pressure wheel 31 press the plastic film 4, start the motor, the winding roller 2 rotates, the plastic film 4 moves forward, and the plastic film 4 drives the first pressure wheel 30 and the second pressure wheel 31 to rotate. After all the plastic films 4 that need to be rolled up are rolled into a cylindrical shape, turn off the motor and rotate the inclined rod 311 clockwise at the same time to drive the second pressure wheel 31 away from the first pressure wheel 30, the tensioning assembly 3 stops running, and the winding operation is completed.

[0055] In summary, the present application generates friction between the first pressing wheel 30, the second pressing wheel 31 and the plastic film 4 during the movement of the plastic film 4. The friction causes the plastic film 4 to drive the first pressing wheel 30, the second pressing wheel 31 to rotate. Since the hub end faces of the first pressing wheel 30, the second pressing wheel 31 are inclined relative to the vertical plane, the first pressing wheel 30, the second pressing wheel 31 have an oblique outward linear velocity v1 during the rotation process. The linear velocity v1 will generate an oblique outward driving force F on the plastic film 4, so that the plastic film 4 has an outward expansion tendency to move leftward and rightward during the forward movement, so that the plastic film 4 always has a certain tensioning force, thereby flattening the plastic film 4 and avoiding the formation of wrinkles.

[0056] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A plastic film tensioning device for a winding machine, comprising a ⊔-shaped support frame (1) and a winding roller (2), characterized in that: The plastic film tensioning device for the winding machine further comprises a tensioning assembly (3) fixed to the bottom of the ⊔-shaped support frame (1), and the tensioning assembly (3) is symmetrically arranged in two groups; The tensioning assembly (3) comprises a first pressing wheel (30) arranged obliquely, a second pressing wheel (31) arranged above the first pressing wheel (30), a mounting groove (32) for fixing the first pressing wheel (30), and an adjusting wheel (33) hingedly connected to the second pressing wheel (31) and located on one side of the mounting groove (32); The bottom of the mounting groove (32) is fixedly connected to the bottom of the ⊔-shaped support frame (1); the adjusting wheel (33) is fixed to the support frame (1) via a connecting rod (331); the top of the second pressing wheel (31) is away from the middle of the ⊔-shaped support frame (1); and the bottom of the first pressing wheel (30) is close to the middle of the ⊔-shaped support frame (1); Initially, the first pressing wheel (30) and the second pressing wheel (31) press against each other, and a gap is formed at the pressing position to allow the plastic film (4) to pass through.

2. The plastic film tensioning device for a winding machine according to claim 1, characterized in that: Two ends of the pressing wheel shaft of the first pressing wheel (30) are rotatably connected to two sides of the installation groove (32) respectively.

3. The plastic film tensioning device for a winding machine according to claim 1, characterized in that: An inclined rod (311) extends outwardly from the pressing wheel axis of the second pressing wheel (31), the inclined rod (311) is fixedly connected to the hinge of the adjusting wheel (33), and the hinge is rotatably connected to the center of the circle of the adjusting wheel (33).

4. The plastic film tensioning device for a winder according to claim 1 or 3, characterized in that: The adjusting wheel (33) can drive the second pressing wheel (31) to shift its position, so that the second pressing wheel (31) moves away from or closer to the first pressing wheel (30).

5. The plastic film tensioning device for a winding machine according to claim 1, characterized in that: The first pressing wheel (30) and the second pressing wheel (31) are axially positioned by means of a locking nut, and the first pressing wheel (30) and the second pressing wheel (31) are radially positioned by means of a flat key.

6. The plastic film tensioning device for a winding machine according to claim 1, characterized in that: The winding roller (2) spans across the middle of the ⊔-shaped support frame (1) and is located behind the tensioning assembly (3). The two ends of the winding roller (2) are respectively rotatably connected to the two side edges of the ⊔-shaped support frame (1). The winding roller (2) is used to receive and wind up the plastic film (4) from the tensioning assembly (3).

7. The plastic film tensioning device for a winder according to claim 1 or 6, characterized in that: The roller shaft of the winding roller (2) is connected to the output end of the motor.

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