Biaxial stretching air clamp for thin film

Abstract

The utility model discloses a film two-way stretching air clamp which comprises a shell, a piston assembly and a driving assembly. The piston assembly comprises a piston rod and a roller, a long-strip through hole is formed in the side wall of the piston rod, the longitudinal section of the roller is oval, a rotating shaft is arranged in the middle of the roller and penetrates through the long-strip through hole, an inclined face is arranged at the lower end of the piston rod, and the roller is located below the inclined face. The driving assembly drives the piston rod to slide up and down relative to the shell. The roller at least comprises a first position and a second position; when the rotating shaft is located at the lower end of the strip-shaped through hole, the roller is located at the first position; when the piston rod continues to move downwards, the rolling wheel moves upwards along the long-strip-shaped through hole relative to the piston rod and abuts against the inclined face, the inclined face guides the rolling wheel to rotate by a certain angle, and the rolling wheel is located at the second position. When the film two-way stretching air clamp is used, pressing force on a film is large, so that the film is not prone to being separated, and the film is prone to being separated from the film after being stretched.

Description

Technical Field

[0001] The utility model relates to the technical field of film processing, in particular to a film biaxially stretched air clamp. Background Art

[0002] During the stretching process of a thick film biaxial tensile testing machine, the air clamp secures the sheet. This clamp uses high-pressure gas to push down a pressure rod within the clamp, securing the sheet and preventing it from falling out, allowing for subsequent stretching. Currently, the contact surface between the air clamp and the sheet is smooth. This makes it easy for the sample to detach when the tension is high, making it difficult to stretch. Furthermore, after stretching, the air clamp deflates and retracts, causing the sheet to dent, causing the pressure rod to press downward, making it difficult for the stretched sheet to escape. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model provides a film biaxially stretched air clamp.

[0004] The present invention provides a biaxially oriented film air clamp for compressing a film. The biaxially oriented film air clamp comprises:

[0005] case;

[0006] The piston assembly includes a piston rod and a roller. The upper end of the piston rod is inserted into the housing and is slidably connected to the housing. The side wall of the piston rod is provided with an elongated through hole extending in the vertical direction. The longitudinal cross-section of the roller is elliptical. The middle part of the roller is provided with a rotating shaft, which passes through the elongated through hole. The lower end of the piston rod is provided with an inclined surface, and the roller is located below the inclined surface.

[0007] A driving assembly, used for driving the piston rod to slide in an up-down direction relative to the housing;

[0008] The roller includes at least a first position and a second position;

[0009] When the rotating shaft is located at the lower end of the long through hole, the roller is located at the first position;

[0010] The piston rod drives the roller to move downward so that the roller abuts against the film. When the piston rod continues to move downward, the roller moves upward along the long through hole relative to the piston rod and abuts against the inclined surface. The inclined surface guides the roller to rotate a certain angle, and the roller is located in the second position.

[0011] The film bidirectional stretching air clip has at least the following technical effects: when the driving assembly drives the piston rod to slide downwards, the piston rod drives the roller to move downwards, so that the piston rod presses the film downwards; at this time, the piston rod continues to move downwards, the roller moves upwards relative to the piston rod along the long hole, the upper side of the roller abuts against the inclined surface, the roller rotates by a certain angle under the guidance of the inclined surface, and the inclined surface applies a downward force to the roller, so that the roller presses the film tightly; after the film stretching is completed, the driving assembly drives the piston rod to slide upwards, the roller moves downwards relative to the piston rod along the long hole under the action of gravity, and after the shaft reaches the lowermost end of the long hole, the piston rod drives the roller to move upwards and thus separates from the film; in this process, since the roller and the inclined surface are separated from each other, the rotation of the roller back to the initial angle under the action of gravity can ensure that the roller and the film are separated from each other, and the film is prevented from adhering to the roller.

[0012] According to some embodiments of the utility model, the upper end of the piston rod is provided with a sealing ring, the sealing ring separates the shell inner cavity to form a first cavity and a second cavity, and the first cavity is located above the second cavity.

[0013] According to some embodiments of the utility model, the driving assembly comprises a first air pipe, the shell is provided with a first through hole communicated with the first cavity, the first air pipe is communicated with the first cavity through the first through hole, the first air pipe can supply air to the first cavity to push the piston rod to move downwards, and the first air pipe can discharge the gas in the first cavity to make the piston rod move upwards.

[0014] According to some embodiments of the utility model, a reset spring is arranged in the second cavity, the reset spring is sleeved on the piston rod, the upper end of the reset spring abuts against the sealing ring, and the lower end of the reset spring abuts against the shell.

[0015] According to some embodiments of the utility model, the driving assembly further comprises a second air pipe, the shell is provided with a second through hole communicated with the shell inner cavity, the second air pipe is communicated with the shell inner cavity through the second through hole, and the second through hole is located below the first through hole; when the sealing ring moves downwards to make the second through hole and the first cavity be communicated, the gas in the first cavity can be discharged through the second air pipe.

[0016] According to some embodiments of the utility model, the outer circumferential surface of the roller is provided with anti-skid stripes.

[0017] According to some embodiments of the utility model, a plurality of anti-skid stripes are distributed circumferentially along the roller.

[0018] According to some embodiments of the present invention, when the roller is located at the first position, the major axis of the elliptical cross-section of the roller is parallel to the horizontal plane.

[0019] According to some embodiments of the present invention, the inclined surface slopes upward from left to right.

[0020] According to some embodiments of the present invention, the lower end of the piston rod is provided with two symmetrically arranged connecting plates, both of the connecting plates are provided with the long through holes, the roller is located between the two connecting plates, and the two ends of the rotating shaft are respectively passed through the long through holes of the two connecting plates.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 Schematic diagram of the structure of the film biaxial stretching air clamp of some embodiments of the present invention;

[0024] Figure 2 is a cross-sectional view of a biaxially oriented film air clamp according to some embodiments of the present invention;

[0025] Figure 3 is a schematic diagram of some embodiments of the present invention in which the roller is located in a first position and is separated from the film;

[0026] Figure 4 is a schematic diagram of some embodiments of the present invention in which the roller is located in a first position and abuts against the film;

[0027] Figure 5 This is a schematic diagram of some embodiments of the present invention in which the roller is located in the second position and presses the film.

[0028] Figure Number:

[0029] Housing 100, film 101, first cavity 110, second cavity 120, return spring 130, connecting piece 140;

[0030] Piston assembly 200, piston rod 210, elongated through hole 211, inclined surface 212, sealing ring 213, roller 220, rotating shaft 221;

[0031] Driving assembly 300 , first air pipe 310 , first through hole 311 , second air pipe 320 , second through hole 321 . DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of this utility model, "above," "below," and "within" are understood to be exclusive of the number indicated, while "above," "below," and "within" are understood to be inclusive of the number indicated. The use of "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number or order of the technical features indicated.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings.

[0037] According to some embodiments of the present invention, referring to Figures 1 to 5 The film biaxial stretching air clamp is used to compress the film 101. The film biaxial stretching air clamp includes a housing 100, a piston assembly 200, and a drive assembly 300. The piston assembly 200 includes a piston rod 210 and a roller 220. The upper end of the piston rod 210 is inserted into the housing 100 and is slidably connected to the housing 100. The side wall of the lower end of the piston rod 210 is provided with an elongated through hole 211 extending in the up-down direction. The longitudinal section of the roller 220 is elliptical. A rotating shaft 221 is provided in the middle of the roller 220. The rotating shaft 221 is fixedly connected to the roller 220. The rotating shaft 221 passes through the elongated through hole 211. The axial direction of the rotating shaft 221 is the front-to-back direction. The rotating shaft 221 can rotate around its own axis to drive the roller 220 to rotate. The lower end of the piston rod 210 is provided with an inclined surface 212, and the roller 220 is located below the inclined surface 212. The driving assembly 300 can drive the piston rod 210 to slide in the up-down direction relative to the housing 100 , thereby driving the roller 220 to slide in the up-down direction.

[0038] The roller 220 includes at least a first position and a second position;

[0039] Reference Figure 3 When the rotating shaft 221 is located at the lower end of the long through hole 211, the roller 220 is located at the first position.

[0040] Reference Figure 3 and Figure 4 When the driving assembly 300 drives the piston rod 210 to move downward, the piston rod 210 drives the roller 220 to move downward so that the roller 220 abuts against the film 101. At this time, the roller 220 remains in the first position, that is, under the action of gravity, the rotating shaft 221 abuts against the lower hole wall of the long through hole 211, and the distance between the roller 220 and the inclined surface 212 in the up and down direction is the largest.

[0041] Reference Figure 4 and Figure 5 When the piston rod 210 continues to move downward, since the roller 220 has already abutted against the film 101, the inclined surface 212 gradually approaches the roller 220 downward, and the roller 220 moves upward along the long through hole 211 relative to the piston rod 210 and abuts against the inclined surface 212. The inclined surface 212 exerts a downward force on the roller 220, so that the roller 220 presses the film 101. At the same time, since the inclined surface 212 is not parallel to the long axis of the elliptical cross-section of the roller 220, the inclined surface 212 guides the roller 220 to rotate a certain angle counterclockwise, so that the roller 220 is located in the second position.

[0042] It is understandable that, referring to Figure 3 and Figure 4 When the driving assembly 300 drives the piston rod 210 to slide downward, the piston rod 210 drives the roller 220 to move downward, so that the piston rod 210 presses down the film 101. Figure 4 and Figure 5 The piston rod 210 continues to move downward, and the roller 220 moves upward along the long through hole 211 relative to the piston rod 210. The upper side of the roller 220 abuts against the inclined surface 212. Under the guidance of the inclined surface 212, the roller 220 rotates a certain angle in the counterclockwise direction, and the inclined surface 212 applies a downward force to the roller 220, so that the roller 220 presses the film 101.

[0043] After the film 101 is stretched, the drive assembly 300 drives the piston rod 210 to slide upward. Under the action of gravity, the roller 220 moves downward relative to the piston rod 210 along the elongated through hole 211. After the rotating shaft 221 reaches the lowest end of the elongated through hole 211, the roller 220 rotates again so that the major axis of the elliptical cross-section of the roller 220 is parallel to the horizontal plane. The piston rod 210 drives the roller 220 to move upward and thus separate from the film 101. During this process, since the roller 220 and the inclined surface 212 are separated from each other, the roller 220 rotates back to the initial angle under the action of gravity to ensure that the roller 220 and the film 101 are separated from each other, preventing the film 101 from adhering to the roller 220.

[0044] According to some embodiments of the present invention, referring to Figure 2 A sealing ring 213 is provided at the upper end of the piston rod 210. The sealing ring 213 is located in the inner cavity of the shell 100. The sealing ring 213 separates the inner cavity of the shell 100 into a first cavity 110 and a second cavity 120. The first cavity 110 is located above the second cavity 120.

[0045] Preferably, refer to Figure 2 The drive assembly 300 includes a first air pipe 310. The housing 100 is provided with a first through-hole 311 connected to the first cavity 110. The first air pipe 310 communicates with the first cavity 110 through the first through-hole 311. The first air pipe 310 can supply air to the first cavity 110, increasing the air pressure within the first cavity 110 and pushing the piston rod 210 downward. When the first air pipe 310 stops supplying air and discharges the air within the first cavity 110 through the first air pipe 310, the piston rod 210 moves upward and returns to its initial position because the air pressure in the second cavity 120 is greater than that in the first cavity 110.

[0046] Preferably, refer to Figure 2 A return spring 130 is provided in the second cavity 120. The return spring 130 is sleeved on the piston rod 210. The upper end of the return spring 130 abuts the sealing ring 213, and the lower end of the return spring 130 abuts the housing 100. It is understood that the first air pipe 310 supplies air to the first cavity 110, causing the air pressure in the first cavity 110 to increase, thereby overcoming the force of the return spring 130 and pushing the piston rod 210 downward. When the first air pipe 310 stops supplying air and exhausts air, the piston rod 210 moves upward and returns to its initial position under the action of the return spring 130. It is understood that the return spring 130 can ensure that the piston rod 210 returns to its initial position in the event of poor sealing of the second cavity 120.

[0047] Further, refer to Figure 2The drive assembly 300 further includes a second air pipe 320. The housing 100 is provided with a second through-hole 321 connected to the inner cavity of the housing 100. The second air pipe 320 communicates with the inner cavity of the housing 100 through the second through-hole 321. The second through-hole 321 is located below the first through-hole 311. It will be appreciated that when the sealing ring 213 moves downward, connecting the second through-hole 321 with the first cavity 110, the gas in the first cavity 110 is discharged through the second air pipe 320, thereby limiting the maximum downward movement distance of the piston rod 210 and preventing damage to the piston rod 210 or rupture due to excessive air pressure in the inner cavity of the housing 100.

[0048] According to some embodiments of the present invention, the outer circumference of roller 220 is provided with anti-slip stripes. The anti-slip stripes ensure that roller 220 compresses film 101 tightly, preventing film 101 from deviating during the stretching process. Preferably, multiple anti-slip stripes are arranged at intervals and distributed circumferentially along roller 220, i.e., the multiple anti-slip stripes are distributed circumferentially around the axis of rotation shaft 221.

[0049] According to some embodiments of the present invention, referring to Figure 2 When the roller 220 is in the first position, the major axis of the elliptical cross-section of the roller 220 is parallel to the horizontal plane. The inclined surface 212 is inclined upward from left to right. When the inclined surface 212 moves downward relative to the roller 220 and abuts against the roller 220, the inclined surface 212 guides the roller 220 to rotate in a counterclockwise direction.

[0050] According to some embodiments of the present invention, referring to Figure 1 The lower end of the piston rod 210 is provided with two connecting pieces 140 symmetrically arranged along the front-to-back direction. Both connecting pieces 140 have an elongated through-hole 211. The roller 220 is located between the two connecting pieces 140. The front and rear ends of the rotating shaft 221 are respectively passed through the elongated through-holes 211 of the two connecting pieces 140. The two connecting pieces 140 ensure a stable connection between the roller 220 and the piston rod 210.

[0051] Throughout this specification, references to the term "some embodiments" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A film biaxial stretching air clamp for compressing a film (101), characterized in that: include: Housing (100); The piston assembly (200) comprises a piston rod (210) and a roller (220), wherein the upper end of the piston rod (210) is inserted into the housing (100) and is slidably connected to the housing (100), the side wall of the piston rod (210) is provided with an elongated through hole (211) extending in the up-down direction, the longitudinal section of the roller (220) is elliptical, the middle portion of the roller (220) is provided with a rotating shaft (221), the rotating shaft (221) is passed through the elongated through hole (211), the lower end of the piston rod (210) is provided with an inclined surface (212), and the roller (220) is located below the inclined surface (212); A driving assembly (300) for driving the piston rod (210) to slide in an up-down direction relative to the housing (100); The roller (220) comprises at least a first position and a second position; When the rotating shaft (221) is located at the lower end of the long through hole (211), the roller (220) is located at the first position; The piston rod (210) drives the roller (220) to move downward so that the roller (220) abuts against the film (101). When the piston rod (210) continues to move downward, the roller (220) moves upward along the long through hole (211) relative to the piston rod (210) and abuts against the inclined surface (212). The inclined surface (212) guides the roller (220) to rotate a certain angle, and the roller (220) is located in the second position.

2. The film biaxially stretched air clamp according to claim 1, characterized in that: A sealing ring (213) is provided at the upper end of the piston rod (210), and the sealing ring (213) separates the inner cavity of the shell (100) into a first cavity (110) and a second cavity (120), wherein the first cavity (110) is located above the second cavity (120).

3. The film biaxially stretched air clamp according to claim 2, characterized in that: The driving assembly (300) includes a first air pipe (310), and the housing (100) is provided with a first through hole (311) connected to the first cavity (110). The first air pipe (310) is connected to the first cavity (110) through the first through hole (311). The first air pipe (310) can supply air to the first cavity (110) to push the piston rod (210) to move downward. The first air pipe (310) can expel the air in the first cavity (110) to enable the piston rod (210) to move upward.

4. The film biaxially stretched air clamp according to claim 3, characterized in that: A return spring (130) is provided in the second cavity (120), and the return spring (130) is sleeved on the piston rod (210). The upper end of the return spring (130) abuts against the sealing ring (213), and the lower end of the return spring (130) abuts against the housing (100).

5. The film biaxially stretched air clamp according to claim 3, characterized in that: The drive assembly (300) further includes a second air pipe (320), the housing (100) is provided with a second through hole (321) connected to the inner cavity of the housing (100), the second air pipe (320) is connected to the inner cavity of the housing (100) through the second through hole (321), and the second through hole (321) is located below the first through hole (311); when the sealing ring (213) moves downward so that the second through hole (321) and the first cavity (110) are connected, the gas in the first cavity (110) can be discharged through the second air pipe (320).

6. The film biaxially stretched air clamp according to claim 1, characterized in that: The outer peripheral surface of the roller (220) is provided with anti-slip stripes.

7. The film biaxially stretched air clamp according to claim 6, characterized in that: A plurality of anti-slip stripes are distributed along the circumference of the roller (220).

8. The film biaxially stretched air clamp according to claim 6, characterized in that: When the roller (220) is located at the first position, the major axis of the elliptical cross-section of the roller (220) is parallel to the horizontal plane.

9. The film biaxially stretched air clamp according to claim 6, characterized in that: The inclined surface (212) is inclined upward from left to right.

10. The film biaxially stretched air clamp according to claim 1, characterized in that: The lower end of the piston rod (210) is provided with two symmetrically arranged connecting plates (140), and the two connecting plates (140) are both provided with the long through hole (211). The roller (220) is located between the two connecting plates (140), and the two ends of the rotating shaft (221) are respectively passed through the long through holes (211) of the two connecting plates (140).

Images