Thermal extension test device

Abstract

The utility model provides a thermal extension test device which comprises a test box, an upper clamp, a lower clamp, a traction mechanism, a tension sensor, a temperature sensor and a PLC (programmable logic controller), a partition plate is arranged in the test box, and the partition plate divides the interior of the test box into a heating chamber positioned at the upper part and a traction chamber positioned at the lower part; the upper clamp is fixedly mounted on the top of the heating chamber inner wall; a to-be-tested sample is installed on the upper clamp and the lower clamp, the to-be-tested sample is softened at a high temperature in the heating chamber, then rated tension is applied to the to-be-tested sample through the traction mechanism, the to-be-tested sample is subjected to a thermal extension test, and the temperature in the heating chamber is monitored through the temperature sensor; and the PLC drives the traction mechanism to finely adjust the tension to compensate the tension, so that the effective stress is kept constant, the actual stress borne by the material is prevented from being reduced due to temperature rise (or the stress is increased due to temperature reduction), and the effective stress in the test is ensured to always meet the standard requirement.

Description

Technical Field

[0001] This utility model relates to the field of thermal stretching testing, and in particular to a thermal stretching testing device. Background Technology

[0002] Thermal stretching testing is a core testing method for evaluating the deformation resistance of polymer materials (such as cross-linked polyethylene and rubber) under high temperature and mechanical loads, and is widely used in fields such as wires and cables, automotive seals, and aerospace composite materials. Traditional thermal stretching testing equipment typically consists of a constant temperature chamber, a weight loading system, and a manual measuring mechanism. However, in practical applications, it suffers from the following significant drawbacks: Traditional devices rely on gravity loading, which, while providing a constant tensile force, cannot dynamically respond to the material modulus decay caused by temperature changes. For example, when the temperature inside the chamber unexpectedly rises, the material softens, causing its actual stress to far exceed the set value, leading to sample overload and breakage or data distortion. Furthermore, the weight loading requires frequent manual adjustments, which is inefficient and poses a risk of high-temperature operation. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the aforementioned problems in the prior art, this utility model provides a thermal stretching test device.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A thermal stretching test apparatus includes a test chamber, an upper clamp, a lower clamp, a traction mechanism, a tensile sensor, a temperature sensor, and a PLC controller;

[0008] The test chamber is equipped with a partition that divides the interior of the test chamber into a heating chamber at the top and a traction chamber at the bottom.

[0009] The upper clamp is fixedly installed on the top of the inner wall of the heating chamber;

[0010] The traction mechanism is installed in the traction chamber, and the traction end of the traction mechanism is connected to the lower clamp through the tension sensor;

[0011] The temperature sensor is installed inside the heating chamber;

[0012] The PLC controller is electrically connected to the traction mechanism, the tension sensor, and the temperature sensor.

[0013] Preferably, the traction mechanism includes a servo motor, a reducer, a lead screw, a traction rod, a connecting rod, and a lifting block;

[0014] The servo motor is connected to the lead screw via a speed reducer;

[0015] The lifting block is threaded onto the lead screw, and the lifting block is restricted by the inner wall of the heating chamber, so it cannot rotate synchronously with the lead screw;

[0016] One end of the traction rod is connected to the lifting block, and the other end of the traction rod is connected to the tension sensor. The end of the tension sensor away from the traction rod is connected to the lower clamp via the connecting rod.

[0017] Preferably, the connecting rod extends through the partition into the heating chamber, and the partition has a through hole corresponding to the connecting rod, with a high-temperature resistant silicone sleeve installed in the through hole.

[0018] Preferably, the partition is made of a heat-insulating board.

[0019] Preferably, the upper clamp includes a first clamping plate, a second clamping plate, a fixing screw, and a fixing bolt;

[0020] The clamping surface of the first clamping plate is provided with wavy protrusions, and the surface of the first clamping plate is provided with the fixing screw;

[0021] The second clamping plate has a wave-shaped groove corresponding to the wave-shaped protrusion, and the second clamping plate has a connecting hole corresponding to the fixing screw;

[0022] The fixing bolt is installed on the fixing screw;

[0023] The lower clamp has the same structure as the upper clamp.

[0024] (III) Beneficial Effects

[0025] The beneficial effects of this utility model are as follows: By adopting the above technical solution, the sample to be tested is installed in the upper and lower clamps. The high temperature in the heating chamber softens the sample to be tested. Then, the rated tensile force is applied to the sample to be tested through the traction mechanism to conduct a thermal extension test. The temperature in the heating chamber is monitored by the temperature sensor. When the temperature in the heating chamber fluctuates, the PLC controller drives the traction mechanism to fine-tune the tensile force for tensile compensation, keeping the effective stress constant and avoiding the reduction of the actual stress borne by the material due to the increase in temperature (or the increase in stress due to the decrease in temperature), ensuring that the "effective stress" always meets the standard requirements during the test. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a thermal stretching test apparatus;

[0027] Figure 2 This is a schematic front view of a thermal stretching test apparatus.

[0028] Figure 3 This is a schematic diagram of the upper clamp.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1. Test chamber;

[0031] 2. Partition;

[0032] 3. Install the clamp;

[0033] 4. Lower clamp;

[0034] 5. Temperature sensor;

[0035] 6. Traction mechanism;

[0036] 61. Servo motor; 62. Reducer; 63. Lead screw; 64. Lifting block; 65. Traction rod; 66. Connecting rod;

[0037] 7. Tension sensor;

[0038] 8. PLC controller. Detailed Implementation

[0039] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Please refer to Figures 1 to 3 This utility model provides a thermal stretching test device, including a test chamber 1, an upper clamp 3, a lower clamp 4, a traction mechanism 6, a tensile sensor 7, a temperature sensor 5, and a PLC controller 8;

[0041] The test chamber 1 is equipped with a partition 2, which divides the interior of the test chamber 1 into a heating chamber located at the top and a traction chamber located at the bottom.

[0042] The upper clamp 3 is fixedly installed on the top of the inner wall of the heating chamber;

[0043] The traction mechanism 6 is installed in the traction chamber, and the traction end of the traction mechanism 6 is connected to the lower clamp 4 through the tension sensor 7;

[0044] The temperature sensor 5 is installed in the heating chamber;

[0045] The PLC controller 8 is electrically connected to the traction mechanism 6, the tension sensor 7, and the temperature sensor 5.

[0046] In use, the sample to be tested is installed in the upper clamp 3 and the lower clamp 4. The high temperature in the heating chamber softens the sample. Then, the rated tension is applied to the sample through the traction mechanism 6 to conduct a thermal extension test. The temperature in the heating chamber is monitored by the temperature sensor 5. When the temperature in the heating chamber fluctuates, the PLC controller 8 drives the traction mechanism 6 to fine-tune the tension to compensate for the tension and keep the effective stress constant. This avoids the actual stress on the material decreasing due to temperature rise (or the stress increasing due to temperature drop), and ensures that the "effective stress" always meets the standard requirements during the test.

[0047] It should be noted that the heating chamber adopts an oven design and has a constant temperature heating function.

[0048] In this embodiment, the traction mechanism 6 includes a servo motor 61, a reducer 62, a lead screw 63, a traction rod 65, a connecting rod 66, and a lifting block 64;

[0049] The servo motor 61 is connected to the lead screw 63 via a reducer 62;

[0050] The lifting block 64 is threaded onto the lead screw 63, and the lifting block 64 is restricted by the inner wall of the heating chamber and cannot rotate synchronously with the lead screw 63;

[0051] One end of the traction rod 65 is connected to the lifting block 64, and the other end of the traction rod 65 is connected to the tension sensor 7. The end of the tension sensor 7 away from the traction rod 65 is connected to the lower clamp 4 through the connecting rod 66.

[0052] In use, the servo motor 61 drives the lead screw 63 to rotate through the reducer 62. The lifting block 64 is restricted by the inner wall of the heating chamber, so that the lifting block 64 can be lifted and lowered along the length of the lead screw 63, thereby fine-tuning the tension of the sample to be tested.

[0053] In this embodiment, the connecting rod 66 extends through the partition 2 into the heating chamber. The partition 2 has a through hole corresponding to the connecting rod 66. A high-temperature resistant silicone sleeve is installed in the through hole. The high-temperature resistant silicone sleeve covers the gap between the connecting rod 66 and the through hole, allowing the connecting rod 66 to move axially while blocking heat convection, thus preventing the heat in the heating chamber from affecting the traction chamber.

[0054] In this embodiment, the partition 2 is made of heat insulation board, which serves as heat insulation.

[0055] In this embodiment, the upper clamp 3 includes a first clamping plate, a second clamping plate, a fixing screw, and a fixing bolt;

[0056] The clamping surface of the first clamping plate is provided with wavy protrusions, and the surface of the first clamping plate is provided with the fixing screw;

[0057] The second clamping plate has a wave-shaped groove corresponding to the wave-shaped protrusion, and the second clamping plate has a connecting hole corresponding to the fixing screw;

[0058] The fixing bolt is installed on the fixing screw;

[0059] The lower clamp 4 has the same structure as the upper clamp 3;

[0060] In use, the wavy texture on the first and second clamps can reduce the stress at a single contact point of the sample to be tested, changing the stress distribution from "point contact" to "surface contact", reducing local pressure and avoiding the problem of the sample to be tested breaking due to stress concentration in the clamps.

[0061] The working principle of this utility model is as follows:

[0062] The sample to be tested is mounted on the upper clamp 3 and the lower clamp 4. The high temperature in the heating chamber softens the sample. Then, the rated tension is applied to the sample by the traction mechanism 6 to conduct a thermal extension test. The temperature in the heating chamber is monitored by the temperature sensor 5. When the temperature in the heating chamber fluctuates, the PLC controller 8 drives the traction mechanism 6 to fine-tune the tension to compensate for the tension and keep the effective stress constant. This avoids the actual stress on the material decreasing due to temperature rise (or the stress increasing due to temperature drop), and ensures that the "effective stress" always meets the standard requirements during the test.

[0063] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0064] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

[0065] 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 hot stretching test device characterized by comprising: The test box, the upper clamp, the lower clamp, the traction mechanism, the tension sensor, the temperature sensor and the PLC controller are included. A partition is arranged in the test box, which separates the test box into a heating chamber at the upper part and a traction chamber at the lower part. The upper clamp is fixedly installed on the inner wall top of the heating chamber. The traction mechanism is installed in the traction chamber, and the traction end of the traction mechanism is connected with the lower clamp through the tension sensor. The temperature sensor is installed in the heating chamber. The PLC controller is electrically connected with the traction mechanism, the tension sensor and the temperature sensor.

2. A heat stretching test apparatus according to claim 1, wherein The traction mechanism includes a servo motor, a speed reducer, a screw rod, a traction rod, a connecting rod and a lifting block. The servo motor is connected with the screw rod through the speed reducer. The lifting block is threadedly connected on the screw rod, and is limited by the inner wall of the heating chamber and cannot rotate synchronously with the screw rod. One end of the traction rod is connected with the lifting block, and the other end of the traction rod is connected with the tension sensor.

3. A hot stretching test apparatus according to claim 2, wherein The end of the tension sensor away from the traction rod is connected with the lower clamp through the connecting rod.

4. A heat stretching test apparatus according to claim 3, wherein The connecting rod extends to the heating chamber through the partition.

5. The hot ductility testing apparatus of claim 1, wherein The partition is made of heat insulation plate. The upper clamp includes a first clamping plate, a second clamping plate, a fixing screw rod and a fixing bolt. The clamping surface of the first clamping plate is provided with a wave-shaped protrusion, and the surface of the first clamping plate is provided with the fixing screw rod. The second clamping plate is provided with a wave-shaped groove corresponding to the wave-shaped protrusion, and is provided with a connecting hole corresponding to the fixing screw rod. The fixing bolt is installed on the fixing screw rod. The lower clamp has the same structure as the upper clamp.

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