Thin film tensile strength test fixture and test system

Abstract

The utility model belongs to the technical field of mechanical property test fixtures, and discloses a thin film tensile strength test fixture and a test system. The device comprises a mounting seat and a fixing frame arranged on the mounting seat. The fixing frame comprises a bearing table, a limiting hole is formed in the bearing table, a fixing assembly is movably connected to the fixing frame, and a driving piece is further connected to the fixing frame. The driving part is connected with the fixing assembly to drive the fixing assembly to be inserted into or leave the limiting hole, and the to-be-tested film can be pressed into the limiting hole when the fixing assembly is inserted into the limiting hole. The fixing assembly can be matched with the limiting hole to jointly clamp the to-be-tested film, so that the fixing effect on the to-be-tested film during film tensile strength testing is improved, and the to-be-tested film is prevented from sliding. By using the thin film tensile strength test fixture, the thin film to be tested can be ensured not to slide due to poor fixation to influence the test effect during the tensile strength test.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical property testing fixtures, in particular to a film tensile strength testing fixture and a testing system. Background Art

[0002] Plastic packaging film is subjected to mechanical forces during the printing production process and during use. The tensile deformation of the plastic packaging film during dynamic changes can easily cause unpredictable consequences such as film breakage. Therefore, it is particularly important to test the tensile strength of the plastic packaging film and fully understand the mechanical properties of the plastic packaging film to provide guidance for specific production.

[0003] In conventional testing of the tensile strength of plastic packaging films, flat clamps are typically used to clamp the ends of the flexible plastic packaging film, which is then stretched at these ends. Because the film is held in place during stretching solely by the friction between the two clamps and the film, testing plastic packaging films with low coefficients of friction can lead to insufficient maximum static friction between the film and the clamps. This can cause relative slippage between the film and the clamps, preventing full stretch and resulting in test failure. Utility Model Content

[0004] The purpose of the utility model is to provide a film tensile strength testing fixture and a testing system, wherein the film tensile strength testing fixture can improve the fixing effect of the film during the film tensile strength test.

[0005] To achieve this purpose, the present invention provides the following technical solutions:

[0006] A film tensile strength testing fixture, comprising:

[0007] The fixing frame includes a supporting platform, the supporting platform has a limiting hole, a fixing component is movably connected to the fixing frame, and a driving member is also connected to the fixing frame. The driving member is connected to the fixing component to drive it to insert into or leave the limiting hole. When the fixing component is inserted into the limiting hole, the film to be tested can be pressed into the limiting hole.

[0008] Preferably, the fixing assembly includes a crossbeam and at least two fixing columns, and the fixing columns are arranged parallel to each other and spaced apart along a straight line on the crossbeam.

[0009] Preferably, one end of the fixing column is connected to the crossbeam, and the other end can be inserted into the limiting hole, and the cross-sectional shape of the end of the fixing column inserted into the limiting hole and the cross-sectional shape of the limiting hole are both circular.

[0010] Preferably, one end of the fixing column inserted into the limiting hole is a cylindrical portion, and a protrusion is provided circumferentially of the fixing column and on the side of the cylindrical portion away from the limiting hole. The cross-sectional area of ​​the protrusion is larger than the cross-sectional area of ​​the limiting hole, and the side of the protrusion close to the supporting platform can clamp the film to be tested together with the supporting platform.

[0011] Preferably, a fixing portion is provided at one end of the fixing assembly inserted into the limiting hole.

[0012] Preferably, one end of the fixing component inserted into the limiting hole is provided with a first anti-slip pattern, and the inner wall of the limiting hole is provided with a second anti-slip pattern that can cooperate with the first anti-slip pattern.

[0013] On the other hand, the present invention provides the following technical solutions:

[0014] A film tensile strength testing system comprises a frame and the above-mentioned film tensile strength testing fixture, wherein the film tensile strength testing fixture is arranged on the frame.

[0015] Preferably, the film tensile strength testing system further comprises a mounting seat, the mounting seat is arranged on the frame, and the fixing frame is connected to the mounting seat via a tension sensor.

[0016] Preferably, the tension sensor is arranged on one side of the fixing frame, the bearing platform is located on the other side of the fixing frame, and the limiting hole is arranged on a side of the bearing platform close to the tension sensor.

[0017] Preferably, the mounting seats are slidably connected to the frame and two of them are arranged opposite to each other, and opposite sides of the two mounting seats are each connected to a fixing frame, so that the two mounting seats can drive the two fixing frames to move closer to or away from each other.

[0018] Beneficial effect: The film tensile strength test fixture provided by the utility model places the end of the film on the supporting platform when performing the film tensile strength test, and then uses the driving member to drive the fixing assembly to press the film into the limiting hole. The film fully fills the gap between the fixing assembly and the limiting hole, that is, the outer wall of the fixing assembly and the inner wall of the limiting hole jointly clamp the film. Compared with using two flat plates for clamping, using the fixing assembly to press the film into the limiting hole produces a certain mechanical locking effect. When the external tension acts on one end of the film, the wrinkled film at the other end of the edge of the limiting hole is difficult to slide into the gap, thereby hindering the sliding of the film as a whole, playing a certain clamping role. In addition, when the fixing assembly presses the film into the limiting hole, it is easy to cause the pressed part of the film to produce tensile deformation, causing microscopic cracks, protrusions or depressions on its surface, increasing the roughness of its surface and thereby increasing the maximum static friction it can generate. At the same time, the film is also subjected to multi-directional uniform pressure brought by the fixing assembly and the limiting hole in the limiting hole. These pressures can generate multi-directional friction forces to jointly hinder the sliding of the film, which helps to increase the tightness of the film in the fixture.

[0019] The film tensile strength testing system provided by the utility model uses the film tensile strength testing fixture, which can ensure that the film to be tested will not slide due to poor fixation during the tensile strength test, affecting the test effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the film tensile strength testing fixture provided by the present invention.

[0021] In the figure: 1-mounting seat; 2-tension sensor; 3-fixed frame; 31-carrying platform; 311-limiting hole;

[0022] 4-driving member; 5-crossbeam; 6-fixed column. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0024] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0027] like Figure 1 As shown, the film tensile strength test fixture provided in this embodiment includes a fixed frame 3, which includes a support platform 31, and a limit hole 311 is formed on the support platform 31. A fixed component is movably connected to the fixed frame 3, and a driving member is also connected to the fixed frame 3. The driving member is connected to the fixed component to drive it into or out of the limit hole 311. When the fixed component is inserted into the limit hole 311, it can press the film to be tested into the limit hole 311. Specifically, when performing a tensile strength test on a film, its ends need to be fixed, and then pressure is generated at both ends to stretch the film body to test the tensile strength, ductility and other mechanical information of the film to be tested.

[0028] Specifically, when using this film tensile strength test fixture, the end of the film needs to be placed on the support platform 31, and then the driver 4 is used to drive the fixing assembly to press the film into the limiting hole 311. The film fully fills the gap between the fixing assembly and the limiting hole 311. That is, the outer wall of the fixing assembly and the inner wall of the limiting hole 311 jointly clamp the film to fix the end of the film to be tested. Compared with using two flat plates for clamping, using the fixing assembly to press the film into the limiting hole 311 produces a certain mechanical locking effect. When an external tensile force is applied to one end of the film, the wrinkled film at the other end of the limiting hole 311 is difficult to slide into the gap, thereby preventing the entire film from sliding, and playing a certain clamping role.

[0029] In addition, when the fixing component presses the film into the limiting hole 311, it is easy for the pressed part of the film to be stretched and deformed, causing microscopic cracks, protrusions or depressions on its surface, increasing the roughness of its surface and thus increasing the maximum static friction it can generate. At the same time, the film is also subjected to multi-directional uniform pressure brought by the fixing component and the limiting hole 311 in the limiting hole 311. When the film is subjected to tension and has a tendency to move relative to each other, one side of the film has an upward relative movement tendency relative to the fixing column and the limiting hole when the film is pulled out, thereby generating a downward friction force, and the other side generates an upward friction force, and the friction force generated at other positions will be in the oblique direction, that is, these pressures can generate multi-directional friction forces to jointly hinder the sliding of the film, which helps to increase the tightness of the film in the clamp.

[0030] Furthermore, in this embodiment, the film to be tested is a plastic packaging film. Furthermore, the driving member 4 is a linear driving member 4 that can drive the fixing assembly to be inserted into the limiting hole 311 along a straight line. In other embodiments, the driving member 4 can also be a flipping mechanism disposed on a side of the support platform 31. When flipped, the flipping mechanism can drive the fixing assembly to flip and insert into the limiting hole 311.

[0031] Furthermore, the fixing assembly includes a crossbeam 5 and at least two fixing columns 6 , and all the fixing columns 6 are arranged parallel to each other and are distributed along a straight line on the crossbeam 5 at intervals.

[0032] Specifically, the length of the crossbeam 5 aligns with the arrangement of the retaining holes 311, and the width of the plastic packaging film, when placed on the support platform 31, aligns with the arrangement of the retaining holes 311. The portion of the fixing assembly that inserts into the retaining holes 311 is a fixing post 6. Using multiple parallel fixing posts 6, spaced along a straight line on the crossbeam 5, allows multiple fixing posts 6 to participate in the securing process when the plastic packaging film is secured, providing multiple fixing positions across the width of the plastic packaging film. Providing multiple fixing positions ensures that when the plastic packaging film is subjected to a tensile force along its length, its ends are fully secured and the force is evenly applied across its width. This prevents the situation where only one fixing post 6 is provided, resulting in the plastic packaging film on either side of the fixing post 6 being unable to be secured, causing it to slide in the direction of tension, resulting in wrinkling of the plastic packaging film and affecting the accuracy of the tensile test. It also prevents stress concentration near a single fixing post 6, which could cause the plastic packaging film to tear at the fixing post 6 and affect its mechanical properties. Furthermore, in this embodiment, there are three fixing posts 6 , which can respectively fix the two ends and the middle of the plastic packaging film along the width direction, thereby ensuring the best fixing effect while setting as few fixing posts 6 as possible.

[0033] Furthermore, one end of the fixing post 6 is connected to the crossbeam 5, and the other end can be inserted into the limiting hole 311. The cross-sectional shape of the end of the fixing post 6 inserted into the limiting hole 311 is circular, as is the cross-sectional shape of the limiting hole 311. Specifically, when the fixing post 6 is inserted into the limiting hole 311, the bottom surface of the fixing post 6 will abut the plastic packaging film and drive it into the limiting hole 311. If the cross-sectional shape of the fixing post 6 is polygonal, the sharp corners of the bottom edge will easily puncture the packaging film after it abuts the plastic packaging film. If the plastic packaging film is not adaptively treated, the damaged part of the plastic packaging film is more likely to break, which can easily affect the tensile strength test results of the plastic packaging film as a whole.

[0034] One end of the fixing column 6 inserted into the limiting hole 311 is a cylindrical portion, and a protrusion is provided on the circumference of the fixing column 6 and on the side of the cylindrical portion away from the limiting hole 311. The cross-sectional area of ​​the protrusion is larger than the cross-sectional area of ​​the limiting hole 311, and the side of the protrusion close to the supporting platform 31 can clamp the film to be tested together with the supporting platform 31.

[0035] Specifically, the fixing post 6 can be provided in sections, with the end of the fixing post 6 inserted into the limiting hole 311 being a cylindrical portion, and the end of the fixing post 6 connected to the crossbeam 5 being a prismatic protrusion. The cross-sectional area of ​​the prismatic portion is larger than that of the limiting hole 311, so that when the cylindrical portion is inserted into the limiting hole 311, the prismatic portion can jointly clamp the film to be tested with the support platform 31. The protrusion can also be a brim-like structure provided circumferentially of the cylindrical fixing post 6, with the portion of the brim-like structure radially extending beyond the fixing post 6 being able to jointly clamp the plastic packaging film with the support platform 31. In some other embodiments, the fixing post 6 can be entirely cylindrical and not provided with a protrusion.

[0036] Furthermore, in this configuration of the fixing post 6, the crossbeam 5 can replace the raised portion. After the fixing post 6 is inserted into the retaining hole 311, the side of the crossbeam 5 near the support platform 31 can work together with the support platform 31 to clamp the plastic packaging film. In this case, the height of the fixing post 6 is less than or equal to the depth of the retaining hole, allowing the fixing post 6 to be fully inserted into the retaining hole.

[0037] Furthermore, the supporting platform 31 may be a platform-shaped component additionally fixed to the fixing frame 3 , and the fixing method may be welding, bonding, or bolt connection. The supporting platform 31 may also be an integrated structure with the fixing frame 3 .

[0038] Specifically, in this embodiment, a fixing portion is provided at one end of the fixing assembly inserted into the limiting hole 311. The fixing portion is intended to further enhance the fixing effect of the fixing assembly on the plastic packaging film.

[0039] In one embodiment, the fixing portion may be a sharp protrusion, which can pierce the plastic packaging film and make the outer wall of the pointed tip abut against the edge of the hole in the plastic packaging film, that is, the end of the plastic packaging film is locked by the cooperation between the sharp protrusion and the hole. When the fixing portion is a sharp protrusion, the plastic packaging film needs to be pre-treated, and adhesive tape is affixed to the two sides of the fixed end of the plastic packaging film. This can strengthen the structural strength of the end of the plastic packaging film and prevent the plastic packaging film from breaking prematurely during the tensile test due to the low strength of the damaged part, thereby affecting the accuracy of the tensile strength test.

[0040] In another embodiment, the fixing portion may also be a rubber pad. The friction coefficient of the surface of the rubber pad is relatively high, and it can provide greater friction to the plastic packaging film when in contact with the plastic packaging film.

[0041] Specifically, one end of the fixing assembly inserted into the limiting hole 311 is provided with a first anti-slip pattern, and the inner wall of the limiting hole 311 is provided with a second anti-slip pattern that can cooperate with the first anti-slip pattern.

[0042] When the fixing component presses the plastic packaging film into the limiting hole 311, the first anti-slip groove and the second anti-slip groove can engage with each other, and the plastic packaging film is clamped in the gap between the first anti-slip groove and the second anti-slip groove. At this time, the wrinkled plastic packaging film is difficult to slide in the gap, that is, the setting of the anti-slip groove further enhances the clamping effect of the film tensile strength test fixture.

[0043] Specifically, this embodiment further provides a film tensile strength testing system, which includes a frame and the above-mentioned film tensile strength testing fixture, and the film tensile strength testing fixture is arranged on the frame.

[0044] That is, a separate film tensile strength test fixture itself cannot directly complete the tensile strength test of the plastic packaging film. It only plays a fixing role during stretching. During the specific tensile test, the film tensile strength test fixture needs to be set on a frame for use.

[0045] Furthermore, the film tensile strength testing system further includes a mounting base 1 , which is arranged on a frame, and a fixing frame 3 is connected to the mounting base 1 via a tension sensor 2 .

[0046] Specifically, after the plastic packaging film is fixed, it needs to be subjected to a tensile strength test. The plastic packaging film will transmit the tension to the fixing frame 3 through the supporting platform 31, and then the fixing frame 3 will generate tension on the tension sensor 2. At this time, the tension sensor 2 can measure the tension data of the plastic packaging film in real time.

[0047] Furthermore, the tension sensor 2 is disposed on one side of the fixing frame 3, the support platform 31 is located on the other side of the fixing frame 3, and the limiting hole 311 is disposed on the side of the support platform 31 that is closest to the tension sensor 2. Specifically, when the plastic packaging film is subjected to a tensile force on the support platform 31 in a direction away from the tension sensor 2, it exerts an equal and opposite external force on the fixing frame 3. Since the fixing frame 3 remains stationary and is connected to the mounting base 1 by the tension sensor 2, the tension sensor 2 applies an equal and opposite tensile force to the fixing frame 3. In other words, the magnitude of the force in the tension sensor 2 is the same as the tensile force applied to the plastic packaging film, and the value displayed by the tension sensor is the tensile force applied to the plastic packaging film.

[0048] Specifically, the mounting frame 3 is a rectangular frame, with the tension sensor 2 and support platform 31 mounted on the two short sides of the frame. The tension sensor 2 is mounted on the outer wall of one short side, while the support platform 31 is mounted on the other short side. The support platform 31 can either form the short side of the mounting frame 3 or be mounted on the inner wall of the short side. Placing the plastic packaging film within the rectangular frame provides a sufficient support surface for the film.

[0049] Furthermore, in this embodiment, the driving member 4 is a pneumatic cylinder. The cylinder body is fixed to the inner wall of one short side of the rectangular frame, near the tension sensor 2, and the cylinder piston rod is connected to the fixed assembly. The cylinder is integrally arranged within the rectangular frame so that when the cylinder provides pressure to the fixed assembly, one end of the cylinder applies pressure to one short side of the rectangular frame, while the other end applies pressure of equal magnitude and opposite direction to the other short side of the rectangular frame. In this case, the cylinder and the rectangular frame can be considered a single mechanical system. When the cylinder is operating, the rectangular frame does not generate additional tension on the tension sensor 2, thereby affecting the detection results.

[0050] Furthermore, the mounting base 1 is slidably connected to the frame and two mounting bases 1 are arranged opposite to each other. The opposite sides of the two mounting bases 1 are connected to a fixing frame 3. The two mounting bases 1 can drive the two fixing frames 3 to move closer to or away from each other.

[0051] Specifically, when the two mounting seats 1 drive the two fixing frames 3 away from each other, both ends of the plastic packaging film fixed in the film tensile strength testing system generate tension in the direction of moving away from each other, causing the entire plastic packaging film to be stretched and deformed.

[0052] Furthermore, the two mounting seats 1 are arranged one above the other, and the mounting seats 1 can drive the fixing frames 3 to move closer to or farther from each other in the vertical direction.

[0053] Specifically, the mounting base 1 can be fixed to the output ends of the cylinders arranged at both ends of the frame, and can also be driven by a screw rod arranged on the frame.

[0054] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A film tensile strength test fixture, characterized in that: include: A fixing frame (3), the fixing frame (3) includes a bearing platform (31), the bearing platform (31) has a limiting hole (311), a fixing component is movably connected to the fixing frame (3), and a driving member (4) is also connected to the fixing frame (3), the driving member (4) is connected to the fixing component to drive it to insert into or leave the limiting hole (311), and when the fixing component is inserted into the limiting hole (311), the film to be tested can be pressed into the limiting hole (311).

2. The film tensile strength testing fixture according to claim 1, characterized in that: The fixing assembly comprises a crossbeam (5) and at least two fixing columns (6), wherein the fixing columns (6) are arranged parallel to each other and are distributed at intervals along a straight line on the crossbeam (5).

3. The film tensile strength testing fixture according to claim 2, characterized in that: One end of the fixing column is connected to the crossbeam (5), and the other end can be inserted into the limiting hole (311), and the cross-sectional shape of the end of the fixing column (6) inserted into the limiting hole (311) and the cross-sectional shape of the limiting hole (311) are both circular.

4. The film tensile strength testing fixture according to claim 3, characterized in that: One end of the fixing column inserted into the limiting hole (311) is a cylindrical portion, and a protrusion is provided on the circumference of the fixing column (6) and on the side of the cylindrical portion away from the limiting hole (311). The cross-sectional area of ​​the protrusion is larger than the cross-sectional area of ​​the limiting hole (311), and the side of the protrusion close to the supporting platform (31) can clamp the film to be tested together with the supporting platform (31).

5. The film tensile strength testing fixture according to any one of claims 1 to 4, characterized in that: One end of the fixing assembly inserted into the limiting hole (311) is provided with a fixing portion.

6. The film tensile strength testing fixture according to any one of claims 1 to 4, characterized in that: One end of the fixing component inserted into the limiting hole (311) is provided with a first anti-slip pattern, and the inner wall of the limiting hole (311) is provided with a second anti-slip pattern that can cooperate with the first anti-slip pattern.

7. A film tensile strength testing system, characterized in that: It comprises a frame and a film tensile strength testing fixture as described in any one of claims 1 to 6, wherein the film tensile strength testing fixture is arranged on the frame.

8. The film tensile strength testing system according to claim 7, characterized in that: The film tensile strength testing system further comprises a mounting seat (1), wherein the mounting seat (1) is arranged on the frame, and the fixing frame (3) is connected to the mounting seat (1) via a tension sensor (2).

9. The film tensile strength testing system according to claim 8, characterized in that: The tension sensor (2) is arranged on one side of the fixing frame (3), the bearing platform (31) is located on the other side of the fixing frame (3), and the limiting hole (311) is arranged on a side of the bearing platform (31) close to the tension sensor (2).

10. The film tensile strength testing system according to claim 9, characterized in that: The mounting seats (1) are slidably connected to the frame and two of them are arranged opposite to each other. The opposite sides of the two mounting seats (1) are each connected to a fixing frame (3). The two mounting seats (1) can drive the two fixing frames (3) to move closer to or farther from each other.

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