Clamp, clamp for preventing sample from being released, and film heat shrinkage performance measuring device

Abstract

This invention relates to the field of film shrinkage measurement technology, encompassing clamping plates, a fixture for preventing sample strip detachment, and a device for measuring the heat shrinkage properties of films. The fixture includes fastening bolts and two symmetrically arranged clamping plate bodies. The fastening bolts pass through and connect the two clamping plate bodies, clamping the sample strip between them. A first arc-shaped groove is formed on one side of each clamping plate body, and a second groove extending perpendicular to the length of the sample strip is formed on the opposite side. A rubber pad is placed within the second groove, and the rubber pad has several protrusions arranged in an array to compress the end of the sample strip. This clamping plate structure increases the friction between the clamping plate and the sample strip, making it less likely for the sample strip to detach. Simultaneously, the clamping force is evenly distributed, avoiding localized damage to the sample strip and reducing the risk of detachment. The control system of the film heat shrinkage performance measuring device combines the detected pressure data to control the device's operating status in real time, reducing wasted time and improving testing reliability.

Description

Technical Field

[0001] This utility model relates to the field of film shrinkage measurement technology, specifically to a clamping plate, a clamp to prevent the sample strip from falling off, and a device for measuring the thermal shrinkage performance of films. Background Technology

[0002] Film packaging technology is widely used in industries such as food, pharmaceuticals, and electronics. Films shrink in size when heated, and their heat shrinkage performance is closely related to the quality of product packaging.

[0003] For example, Chinese utility model patent application CN218726818U, published on March 24, 2023, discloses a device for measuring the heat shrinkage performance of a film. Specifically, the device includes a base, a main frame, a sample mounting assembly, and a heat insulation cover. The main frame is fixed to the base and has a downward-extending fixing rod. The lower end of the fixing rod is spaced apart from the base to form an installation space. The heat insulation cover is movably mounted on the fixing rod, and a heating element is installed inside the heat insulation cover. When the heat insulation cover is lowered, it closes the installation space. The sample mounting assembly includes a horizontal hanging rod, a sample guide rod, an upper clamp, and a lower clamp. The horizontal hanging rod is detachably mounted to the lower end of the fixing rod. The sample guide rod extends downward perpendicularly to the horizontal hanging rod and has a fixing part for sample adhesion. A displacement sensor is installed on the base corresponding to the sample guide rod to detect the displacement of the lower end of the sample. The upper clamp is mounted on the horizontal hanging rod and spaced apart from the sample guide rod. A tension sensor is installed on the base, and the lower clamp is connected to the tension sensor. Please refer to [link to relevant documentation]. Figure 1 The upper clamp and the lower clamp have the same structure, including fastening bolts and two symmetrically arranged clamping plates 2. The fastening bolts pass through and connect the two clamping plates 2, and the spline 3 is clamped between the two clamping plates 2. A first groove 201 is opened on one side of the clamping plate 2. The two first grooves 201 are combined to form a slot. The horizontal hanging rod is engaged with the slot, thereby clamping the upper clamp onto the cylindrical horizontal hanging rod.

[0004] However, the aforementioned technologies have many shortcomings in their clamping structure and the way they fix the specimen (i.e., the sample). The clamping plate relies solely on simple mechanical clamping. During the test of the sample by the descent of the insulation cover, as the sample shrinks and deforms, the friction between the clamping plate and the sample gradually decreases. When the shrinkage force reaches a certain level, the sample is prone to coming out of the clamping plate, forcing the test to be interrupted. This not only wastes time and samples but also leads to invalid test data. In addition, the clamping force of the clamping plate on the sample is unevenly distributed, which can easily cause local damage to the sample, further reducing the stability of the clamping and increasing the risk of slippage. Summary of the Invention

[0005] To address the aforementioned technical problems, the purpose of this utility model is to propose a clamping plate, a clamp to prevent the sample strip from detaching, and a device for measuring the thermal shrinkage properties of thin films.

[0006] The purpose of this utility model is achieved by the following technical solution. According to this utility model, the clamping plate, the clamp for preventing sample strip from detaching, and the film heat shrinkage performance measuring device include a clamping plate. A first arc-shaped groove is formed on one side of the clamping plate body. The clamping plate body also includes a second groove extending perpendicular to the length of the sample strip on the other side opposite to the first groove. A rubber pad is provided in the second groove, and the rubber pad has several protrusions arranged in an array for pressing the end of the sample strip.

[0007] Furthermore, the second groove is a rectangular groove with one side open.

[0008] Furthermore, the second groove is a rectangular groove that penetrates the main body of the clamping plate along a direction perpendicular to the length of the spline, and the second groove is open on three sides.

[0009] Furthermore, the second groove includes multiple arrayed second sub-grooves, each of which contains a rubber pad.

[0010] Furthermore, a pressure sensor is installed between the raised rubber pad surface and the second groove to monitor the clamping pressure of the clamping plate body on the spline in real time.

[0011] Furthermore, the protrusion is a cube or a hemisphere.

[0012] Furthermore, this utility model also provides a clamp to prevent spline detachment, including a fastening bolt and two symmetrically arranged clamping plates. The fastening bolt passes through and connects the two clamping plates, and the clamping plates adopt the aforementioned structure.

[0013] Furthermore, this utility model also provides a film heat shrinkage performance testing device, specifically including: a base, a main frame, a sample mounting assembly and a heat insulation cover. The sample mounting assembly adopts the aforementioned clamp to prevent the sample strip from coming off the clamp. The two clamps clamp the two ends of the sample strip respectively, and the protrusion on the rubber pad squeezes the end of the sample strip.

[0014] Based on the foregoing technical solution, this utility model has the following beneficial effects:

[0015] A second rectangular groove with a rubber pad is provided on the other side of the clamping plate. The rubber pad has an array of protrusions on the end face of the sample. This serves two purposes: first, it increases the friction between the clamping plates and the sample when the two clamping plates clamp the sample, preventing it from easily detaching from the clamp during testing as the sample tightens; second, it ensures uniform clamping force distribution, avoiding localized damage to the sample, improving clamping stability, and reducing the risk of detachment. Simultaneously, a pressure sensor installed between the surface of the rubber pad facing away from the protrusions and the second groove monitors the clamping pressure in real time. The control system of the film heat shrinkage performance testing device uses this pressure data to control the device's operation in real time. When the pressure sensor detects that the clamping pressure is below a preset threshold, the control system issues an alarm and stops the test, reducing wasted testing time and improving test reliability.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the upper and lower clamps holding the spline in the prior art.

[0018] Figure 2 This is a schematic diagram of the main body of the clamping plate in the clamping plate, the clamp for preventing strip from slipping off the clamp, and the device for measuring the heat shrinkage properties of film of this utility model.

[0019] Figure 3 yes Figure 2 Top view.

[0020] Figure 4 yes Figure 3 Sectional view along the AA direction.

[0021] Figure 5 This is a schematic diagram of the structure of the clamping plate, the clamp to prevent the strip from falling off, and the film heat shrinkage performance measuring device of this utility model, when a hemispherical protrusion is set in the second groove.

[0022] Figure 6 yes Figure 5 Top view.

[0023] [Attached image labels]

[0024] 1. Fixture, 2. Clamping plate body, 201. First groove, 3. Spline, 4. Second groove, 5. Rubber pad, 6. Protrusion, 7. Pressure sensor. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0026] Please see Figure 1 The sample mounting assembly includes two symmetrically distributed clamps 1 (i.e., upper clamp and lower clamp), each clamp 1 including two symmetrically arranged clamping plates and a fastening bolt, the fastening bolt passing through and connecting the two clamping plates, the sample (i.e., the sample strip 4) is clamped between the two clamping plates; one side of the clamping plate is provided with an arc-shaped first groove 201, and the two first grooves 201 are spliced ​​together to form a slot.

[0027] Please see Figure 2 and Figure 3 Based on the aforementioned existing clamping plates, this utility model designs a clamping plate with a second groove 4 extending perpendicularly to the length direction of the sample 3 on the other side of the clamping plate body 2 opposite to the first groove 201. In this embodiment, the second groove 4 is preferably a rectangular groove with an opening facing the sample 3, and it can completely cover the sample 3. The through hole on the clamping plate body 2 for the fastening bolt to pass through is located between the first groove 201 and the second groove 4. A rubber pad 5 is provided in the second groove 4, and the rubber pad 5 has several protrusions 6 arranged in an array for pressing the end of the sample 3. In this embodiment, cubic protrusions are used. After the sample 4 is placed between the two clamping plate bodies 2 and clamped, the heat preservation cover is lowered to heat the sample assembly. During this process, the protrusions 6 on the rubber pad increase the friction between the clamping plate and the sample, so that when the sample shrinks and deforms, and the shrinkage force reaches a certain level, the sample is not easy to fall out of the clamping plate. At the same time, the array distribution of the protrusions 6 makes the clamping force of the clamping plate on the sample 4 evenly distributed, avoiding local damage to the sample and reducing the risk of slippage. Please refer to Figure 4 A pressure sensor 7 is also installed between the surface of the rubber pad with the raised end face and the second groove to measure the clamping pressure of the clamping plate on the sample in real time.

[0028] Furthermore, this utility model also proposes a clamp to prevent the spline from coming off the clamp, including two aforementioned clamping plates arranged symmetrically and a fastening bolt. The fastening bolt passes through and connects the two clamping plates. Two first grooves 201 on one side of the clamping plates are spliced ​​to form a slot, and the protrusions on the two rubber pads on the other side are used to squeeze the two ends of the spline.

[0029] Furthermore, this utility model also proposes a film heat shrinkage performance testing device, including: a base, a main frame, a sample mounting assembly, and a heat insulation cover. The sample mounting assembly adopts the aforementioned clamps to prevent the sample strip from coming off the clamp. The two clamps clamp the two ends of the sample strip respectively, and the protrusions on the rubber pad squeeze the ends of the sample strip. The control system of the film heat shrinkage performance testing device combines the pressure data detected by the pressure sensor 7 to control the operating status of the device in real time. When the pressure sensor 7 detects that the clamping pressure of the clamping plate is lower than the preset threshold, the control system of the film heat shrinkage performance testing device will issue an alarm and stop the test at the same time, reducing the waste of test time and improving the reliability of the test.

[0030] Please see Figure 5 and Figure 6 In other embodiments of this utility model, the rubber pad may also have protrusions of other shapes, such as hemispherical shapes.

[0031] In other embodiments of this utility model, the second groove on the other side of the two clamping plate bodies includes a plurality of square or circular second sub-grooves arranged in an array (both shapes of second sub-grooves satisfy the requirement of covering the spline), and a rubber pad with the above structure is further provided in each third sub-grooves to ensure the clamping of the spline and the uniform distribution of clamping force.

[0032] In other embodiments of this utility model, the rectangular groove with one opening facing the direction of the template can be replaced with a rectangular groove that penetrates the main body of the clamping plate along the direction perpendicular to the length of the template. In this case, the second groove is open on three sides, and the rubber pads of the above structure are still provided in the groove.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the design and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A splint, one side of a splint body (2) is provided with a first arc-shaped recess (201), characterized in that: A second groove (4) extending perpendicular to the length of the template (3) is provided on the other side of the clamp body (2) relative to the first groove (201). A rubber pad (5) is provided in the second groove. The rubber pad (5) is provided with several protrusions (6) arranged in an array for squeezing the end of the template (3).

2. The splint of claim 1, wherein: The second groove (4) is a rectangular groove with one side open.

3. The splint of claim 1, wherein: The second groove (4) is a rectangular groove that runs through the main body of the clamping plate along the direction perpendicular to the length of the spline. At this time, the second groove (4) is open on three sides.

4. The splint of claim 1, wherein: The second groove (4) includes multiple arrayed second sub-grooves, each of which is provided with a rubber pad (5).

5. The clamping plate according to claim 1, characterized in that: A pressure sensor (7) for real-time monitoring of the clamping pressure of the clamping plate body on the spline is installed between the surface of the raised rubber pad (5) and the second groove (4).

6. The clamping plate according to any one of claims 1-5, characterized in that: The protrusion is a cube or a hemisphere.

7. A clamp for preventing spline detachment, comprising fastening bolts and two symmetrically arranged clamping plates, wherein the fastening bolts pass through and connect the two clamping plates, characterized in that: The clamp is the clamp as described in any one of claims 1-6.

8. A device for measuring the heat shrinkage properties of thin films, comprising: The base, main frame, sample mounting assembly, and heat insulation cover are characterized in that: the sample mounting assembly adopts the clamp for preventing the sample strip from coming off the clamp as described in claim 7, the two clamps clamp the two ends of the sample strip respectively, and the protrusion on the rubber pad squeezes the end of the sample strip.

Images