Stretching film strength stretching test device

Abstract

The utility model is suitable for the field of tensile film detection, and provides a tensile film strength tensile testing device, which is used for carrying out tensile testing on a tensile film sample and comprises a testing platform, a stretching assembly; the heating assembly is used for adjusting the temperature and comprises a heat preservation cover which is installed on the testing platform through a clamping strip fixedly arranged on the testing platform, and a heat preservation layer is fixedly arranged on the inner side of the heat preservation cover; the heating unit is used for heating air in the heat preservation cover; the temperature sensor is used for detecting the temperature of air in the heat preservation cover, fixedly installed on the clamp and electrically connected with the control host through a cable. According to the utility model, by arranging the heating assembly, in the measurement process, the temperature of air in the thermal insulation cover is adjusted through the heating unit, and the temperature change in the thermal insulation cover is detected in real time through the temperature sensor, so that the stability of the temperature of air in the thermal insulation cover is ensured, and the strength change of a tensile film sample at different temperatures is measured; and the accuracy of test results is improved.

Description

Technical Field

[0001] This utility model belongs to the field of stretch film testing, and in particular relates to a stretch film strength tensile testing device. Background Technology

[0002] Stretch film is a commonly used packaging film material, typically made of plastics such as polyethylene (PE) or polyvinyl chloride (PVC). It has strong extensibility and adhesion, and can be stretched to several times its original length. It is commonly used in logistics, transportation, hygiene, and food industries.

[0003] After leaving the factory, stretch films typically undergo tensile strength testing to assess product quality. Existing stretch film strength testing equipment usually performs the test at room temperature. However, in practical applications, the temperature of the stretch film covering the product surface varies with the ambient temperature. Test results at room temperature may not accurately reflect the product's performance in actual use. Therefore, tensile testing needs to be conducted at different temperatures to ensure the accuracy of the test results. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a tensile testing device for stretch film strength, which aims to solve the problems mentioned in the background art.

[0005] This utility model embodiment is implemented as follows: a tensile strength testing device for a stretch film, used to perform tensile testing on a stretch film sample, includes:

[0006] Test platform;

[0007] The stretching assembly includes:

[0008] The drive motor is fixedly mounted on the test platform via a mounting bracket.

[0009] The lead screw is horizontally set on the test platform, with one end fixedly connected to the power output end of the drive motor, and a tension seat is installed on it by threaded engagement.

[0010] The measuring seat is fixedly installed on the test platform relative to the position of the tension seat. The tension seat and the measuring seat are clamped at both ends of the stretch film sample by the clamps installed at the upper end.

[0011] The control unit is fixedly installed on the test platform and electrically connected to the drive motor via cables;

[0012] Heating components for regulating temperature include:

[0013] The heat insulation cover is installed on the test platform by a clip that is fixedly set on the test platform, and a heat insulation layer is fixedly set on its inner side.

[0014] Heating unit for heating the air inside the insulation cover;

[0015] A temperature sensor, used to detect the air temperature inside the insulation cover, is fixedly mounted on a fixture and electrically connected to the control host via a cable.

[0016] As a further embodiment of this utility model: two limiting seats are also fixedly installed on the test platform at the positions on both sides of the lead screw. Limiting grooves are fixedly opened on both sides of the tension seat, and limiting strips are fixedly installed on the side of the limiting seat at the position corresponding to the limiting grooves. The limiting strips slide with the limiting grooves to limit the tension seat.

[0017] As a further embodiment of this utility model: the measuring seat includes a clamp and a fixed seat. The fixed seat is fixedly installed on the test platform. The clamp is installed on the fixed seat by a stress sensor fixedly installed on the side. The stress sensor is used to measure the stress during the tensile test of the stretch film.

[0018] As a further embodiment of this utility model: the clamp includes a clamping block, which is fixedly mounted on the tension seat and the clamping seat by a fixing bolt, and the fixing bolt movably passes through the clamping block and is threadedly engaged with the tension seat and the clamping seat.

[0019] As a further embodiment of this utility model: a compensating spring is also movably fitted on the fixing bolt, and the compensating spring is used to assist in squeezing the clamping block.

[0020] As a further embodiment of this utility model: the heating unit includes multiple heating wires and multiple fans. The multiple heating wires are all mounted on the test platform via heating seats that are fixedly mounted on the test platform. A mounting plate is also fixedly mounted on the side of the heating seat, and the fans are mounted on the heating seat via the mounting plate.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. The present invention provides a tensile strength testing device for a stretch film, which, through a heating component, adjusts the air temperature inside the insulation cover during the measurement process, and uses a temperature sensor to detect the temperature change inside the insulation cover in real time, ensuring the stability of the gas temperature inside the insulation cover, thereby measuring the strength change of the stretch film sample at different temperatures and improving the accuracy of the test results.

[0023] 2. The tensile strength testing device for a stretch film provided in this embodiment of the present invention limits the stretching seat by means of a limiting strip and a limiting groove slidingly engaging. When the lead screw drives the stretching seat to move axially, it prevents the stretching seat from rotating with the lead screw, ensuring that the stretching of the stretch film sample is always in a linear stretching state, avoiding the stretch film sample from twisting during stretching, and improving the accuracy of the test results.

[0024] 3. The tensile strength testing device for a stretch film provided in this embodiment of the utility model has a clamping block that presses both ends of the stretch film sample onto the stretching seat and the clamping seat. The stretch film sample is then clamped by the threaded engagement of the fixing bolts with the stretching seat and the clamping seat. The compensation spring further compresses and fixes the clamping block by tightening the fixing bolts, thereby improving the stability of the clamping and preventing the stretch film sample from becoming thinner due to stretching during the stretching process, which could lead to loosening and detachment of the clamping and affect the tensile test results.

[0025] 4. The present invention provides a tensile strength testing device for a stretch film, wherein the heating wire is turned on to heat the inside of the insulation cover, and the fan is turned on to blow the heating wire, thereby driving airflow and accelerating heat transfer. At the same time, the uniformity of air temperature inside the insulation cover is ensured, and the air temperature around the stretch film sample is measured by a temperature sensor. The power of the heating wire is dynamically adjusted by the control host to reduce temperature fluctuation. Attached Figure Description

[0026] Figure 1 A three-dimensional structure of a tensile testing device for tensile strength of a stretch film provided in this embodiment of the utility model. Figure 1 ;

[0027] Figure 2 A three-dimensional structure of a tensile testing device for tensile strength of a stretch film provided in this embodiment of the utility model. Figure 2 ;

[0028] Figure 3 A partial cross-sectional schematic diagram of a tensile testing device for the strength of a stretch film provided in an embodiment of this utility model;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 This is a partial exploded view of the structure of the stretch film sample in a stretch film strength tensile testing device provided in an embodiment of the present invention.

[0031] In the attached diagram: 1 Test platform, 2 Tensile assembly, 21 Control host, 22 Mounting base, 23 Drive motor, 24 Lead screw, 25 Tensile seat, 251 Limiting groove, 26 Measuring seat, 261 Clamp, 262 Stress sensor, 263 Fixing base, 27 Clamp, 271 Clamping block, 272 Fixing bolt, 273 Compensating spring, 28 Limiting seat, 281 Limiting strip, 3 Heating assembly, 31 Insulation cover, 311 Clamping strip, 312 Insulation layer, 32 Heating unit, 321 Heating seat, 322 Heating wire, 323 Mounting plate, 324 Fan, 33 Temperature sensor, 4 Tensile film sample. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0034] Please see Figures 1 to 4 This utility model provides a tensile testing device for stretch film strength, used to perform tensile testing on a stretch film sample 4, including:

[0035] Test platform 1;

[0036] Tensioning component 2 includes:

[0037] The drive motor 23 is fixedly mounted on the test platform 1 via the mounting bracket 22;

[0038] The lead screw 24 is horizontally set on the test platform 1. One end of it is fixedly connected to the power output end of the drive motor 23, and a tension seat 25 is installed on it by threaded engagement.

[0039] The measuring seat 26 is fixedly installed on the test platform 1 relative to the position of the tensile seat 25. The tensile seat 25 and the measuring seat 26 are clamped at both ends of the tensile film sample 4 by the clamp 27 installed at the upper end.

[0040] The control host 21 is fixedly installed on the test platform 1 and electrically connected to the drive motor 23 via a cable;

[0041] Heating component 3, used for temperature regulation, includes:

[0042] The heat insulation cover 31 is installed on the test platform 1 by a clip 311 fixedly set on the test platform 1, and a heat insulation layer 312 is fixedly set on its inner side.

[0043] Heating unit 32 is used to heat the air inside the heat preservation cover 31;

[0044] Temperature sensor 33 is used to detect the air temperature inside the insulation cover 31. It is fixedly installed on the clamp 27 and electrically connected to the control host 21 via a cable.

[0045] In practical application, the tensile film sample 4 is clamped onto the tensile seat 25 and the measuring seat 26 by setting the clamp 27. The mounting seat 22 is started to drive the lead screw 24 to rotate. Under the threaded engagement between the lead screw 24 and the tensile seat 25, the tensile seat 25 is driven to move axially along the lead screw 24, thereby achieving the stretching of the tensile film sample 4. The tensile strain value of the tensile film sample 4 is obtained by the number of rotations of the mounting seat 22 and the pitch of the lead screw 24. Then, the tensile stress is measured by the measuring seat 26. Combined with the stress-strain curve, the tensile strength of the tensile film sample 4 can be obtained.

[0046] In this embodiment, the heating component 3 is set up so that the air temperature inside the heat insulation cover 31 is adjusted by the heating unit 32 during the measurement process, and the temperature sensor 33 detects the temperature change inside the heat insulation cover 31 in real time to ensure the stability of the gas temperature inside the heat insulation cover 31. This allows for the measurement of the strength change of the stretch film sample 4 at different temperatures, thereby improving the accuracy of the test results.

[0047] Please see Figure 3 and Figure 4 In a preferred embodiment of this utility model, two limiting seats 28 are fixedly installed on the test platform 1 at the positions on both sides of the lead screw 24. Limiting grooves 251 are fixedly opened on both sides of the tension seat 25. Limiting strips 281 are fixedly installed on the side of the limiting seat 28 at the position corresponding to the limiting grooves 251. The limiting strips 281 and the limiting grooves 251 slide together to limit the tension seat 25.

[0048] In practical applications, this embodiment limits the tension seat 25 by sliding the limiting strip 281 and the limiting groove 251. When the lead screw 24 drives the tension seat 25 to move axially, it prevents the tension seat 25 from rotating with the lead screw 24, ensuring that the tension of the stretch film sample 4 is always in a linear tension state, avoiding the twisting of the stretch film sample 4 during tensioning, and improving the accuracy of the test results.

[0049] Please see Figures 3 to 5 In another preferred embodiment of the present invention, the measuring seat 26 includes a clamp 261 and a fixed seat 263. The fixed seat 263 is fixedly installed on the test platform 1. The clamp 261 is installed on the fixed seat 263 by a stress sensor 262 fixedly installed on the side. The stress sensor 262 is used to measure the stress during the tensile test of the stretch film.

[0050] In practical applications, this embodiment uses a stress sensor 262 to measure the stress change of the stretching membrane when the stretching seat 25 moves along the axial direction of the lead screw 24. The data is then transmitted to the control host 21 via a cable. Combined with the stretching membrane strain data, a stress-strain curve can be obtained, thereby obtaining the tensile strength data of the stretching membrane.

[0051] Please see Figures 3 to 5 In another preferred embodiment of the present invention, the clamp 27 includes a clamping block 271, which is fixedly mounted on the tension seat 25 and the clamping seat 261 by a fixing bolt 272. The fixing bolt 272 movably passes through the clamping block 271 and is threadedly engaged with the tension seat 25 and the clamping seat 261.

[0052] Furthermore, a compensating spring 273 is movably fitted onto the fixing bolt 272, and the compensating spring 273 is used to assist in compressing the clamping block 271.

[0053] In practical application, the clamping block 271 presses both ends of the stretch film sample 4 onto the stretching seat 25 and the clamping seat 261. The clamping of the stretch film sample 4 is achieved by the threaded engagement of the fixing bolt 272 with the stretching seat 25 and the clamping seat 261. The compensation spring 273 further compresses and fixes the clamping block 271 by the tightening of the fixing bolt 272, thereby improving the stability of the clamping and preventing the thickness of the stretch film sample 4 from becoming thinner due to the stretching process, which would lead to loosening and detachment of the clamping and affect the tensile test results.

[0054] Please see Figure 3 and Figure 4 In another preferred embodiment of the present invention, the heating unit 32 includes a plurality of heating wires 322 and a plurality of fans 324. The plurality of heating wires 322 are all mounted on the test platform 1 by heating seats 321 fixedly mounted on the test platform 1. A mounting plate 323 is also fixedly mounted on the side of the heating seat 321. The fans 324 are mounted on the heating seat 321 by the mounting plate 323.

[0055] In practical application, the heating wire 322 is turned on to heat the inside of the insulation cover 31. At the same time, the fan 324 is turned on to blow the heating wire 322, which drives the air flow and accelerates the heat transfer. Meanwhile, the uniformity of the air temperature inside the insulation cover 31 is ensured. The temperature sensor 33 measures the air temperature around the stretch film sample 4. The power of the heating wire 322 is dynamically adjusted in conjunction with the control host 21 to reduce temperature fluctuations.

[0056] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tensile strength testing device for a stretch film, used for performing tensile tests on a stretch film sample (4), characterized in that: include: Test platform (1); The stretching assembly (2) includes: The drive motor (23) is fixedly mounted on the test platform (1) via the mounting bracket (22); The lead screw (24) is horizontally set on the test platform (1), one end of which is fixedly connected to the power output end of the drive motor (23), and a tension seat (25) is installed on it by threaded engagement; The measuring seat (26) is fixedly installed on the test platform (1) relative to the position of the stretching seat (25). The stretching seat (25) and the measuring seat (26) clamp the two ends of the stretching film sample (4) through the clamp (27) installed at the upper end. The control host (21) is fixedly installed on the test platform (1) and electrically connected to the drive motor (23) via a cable; Heating component (3), used for temperature regulation, includes: The heat insulation cover (31) is installed on the test platform (1) by a clip (311) fixedly set on the test platform (1), and a heat insulation layer (312) is fixedly set on its inner side; Heating unit (32) is used to heat the air inside the heat preservation cover (31); Temperature sensor (33) is used to detect the air temperature inside the heat preservation cover (31). It is fixedly installed on the clamp (27) and electrically connected to the control host (21) via a cable.

2. The tensile strength testing device for a stretch film according to claim 1, characterized in that: Two limiting seats (28) are fixedly installed on the test platform (1) at the positions on both sides of the lead screw (24). Limiting grooves (251) are fixedly opened on both sides of the tension seat (25). Limiting strips (281) are fixedly installed on the side of the limiting seat (28) at the position corresponding to the limiting grooves (251). The limiting strips (281) and the limiting grooves (251) slide to limit the tension seat (25).

3. The tensile strength testing device for a stretch film according to claim 1, characterized in that: The measuring seat (26) includes a clamp (261) and a fixed seat (263). The fixed seat (263) is fixedly installed on the test platform (1). The clamp (261) is installed on the fixed seat (263) by a stress sensor (262) fixedly installed on the side. The stress sensor (262) is used to measure the stress during the tensile test of the stretch film.

4. The tensile strength testing device for a stretch film according to claim 3, characterized in that: The clamp (27) includes a clamping block (271), which is fixedly mounted on the tension seat (25) and the clamping seat (261) by a fixing bolt (272). The fixing bolt (272) movably passes through the clamping block (271) and is threadedly engaged with the tension seat (25) and the clamping seat (261).

5. The tensile strength testing device for a stretch film according to claim 4, characterized in that: A compensating spring (273) is also movably fitted on the fixing bolt (272), and the compensating spring (273) is used to assist in squeezing the clamping block (271).

6. The tensile strength testing device for a stretch film according to claim 1, characterized in that: The heating unit (32) includes multiple heating wires (322) and multiple fans (324). The multiple heating wires (322) are all mounted on the test platform (1) via heating seats (321) fixedly mounted on the test platform (1). A mounting plate (323) is also fixedly mounted on the side of the heating seat (321). The fans (324) are mounted on the heating seat (321) via the mounting plate (323).

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