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fifteen billion six hundred and twenty-one million eight hundred and seventy-eight thousand nine hundred and thirty-five

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Current location: homepage > Product Center > Impact test cryogenic tank > Rubber low temperature brittleness tester >Cdwj-70 rubber plastic low temperature brittleness testing machine (single sample method)
 Cdwj-70 rubber plastic low temperature brittleness testing machine (single sample method)

Cdwj-70 rubber plastic low temperature brittleness testing machine (single sample method)

Product brand: Rubber plastic low temperature brittleness testing machine

Classification: Rubber low temperature brittleness tester

Characteristics and application of rubber plastic low temperature brittleness tester: all technical indexes of the instrument meet the requirements of GB / T 1682-1994 vulcanized rubber low temperature brittleness (single sample method) and other national standards. Determine the maximum temperature of vulcanized rubber when the sample is damaged by impact under specified conditions, i.e

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1 Features and uses:
All technical indexes of the instrument meet the requirements of GB / T 1682-2014 vulcanized rubber low temperature brittleness (single sample method) and other national standards. The brittleness temperature is the highest temperature when vulcanized rubber is damaged by impact under specified conditions, which can be used to compare the performance of plastics and other elastic materials at low temperature. The brittleness temperature and low temperature properties of vulcanized rubber with different rubber materials or formulations can be measured. Therefore, it is indispensable for scientific research on the quality inspection of materials and their products and the control of production process. In the original design of the instrument, a cold well agitator is added, which makes the temperature around the container more uniform, the temperature drops faster, saves time and reduces energy consumption.  

2、 Technical parameters
1. Test temperature: - 70 ℃ - 0 ℃
2. Impact velocity: 2m / s ± 0.2m/s
3. After constant temperature, the temperature fluctuation within 3 min of the test is less than ± 0.5 ℃
4. Distance from impactor center to lower end of gripper: 11 ± 0.5mm
5. Dimension: 720 × 700 × 138mm
6. Power: 1100W
7. Cold well volume: 3L

3、 Structural principle
The equipment is composed of main body of refrigeration compressor, heating device, electronic control box, cooling tank, cooling medium circulation system, automatic alarm device, etc. After starting the refrigeration switch, the compressor starts to work, and the refrigeration system enters the formal working state. The refrigeration compressor works continuously. When the temperature is close to the set temperature, the heating device in the cooling tank starts to provide heat in proportion to balance the excess cooling produced by the refrigeration system, so as to achieve the purpose of constant temperature. Stirring can make the cooling medium in the cooling tank circulate continuously and make the temperature uniform.
3.1 lifting gripper
The lifting clamp is composed of a cylinder with a holder and a cylinder seat.
The distance from the impacted part of the specimen to the lower end of the holder is 11.0 ± 0.5mm
3.2 impact device
The impact device consists of an impactor and an impact cylinder.
3.3 impactor
Shape and size of impactor head. The weight of the impactor is 200 ± 20g and its working stroke is 40 ± 1mm. When the impact cylinder is in reset state, the distance between the end of impactor and the sample is 25 ± 1 mm.
 
4、 How to use it
4.1 turn on the power, the temperature controller and timer display lights.
4.2 inject the frozen medium (generally industrial ethanol) into the cold well, and the injection amount should ensure that the distance between the lower end of the gripper and the liquid level is 75 ± 10 mm.
4.3 clamp the specimen vertically on the holder. The clamp should not be too tight or too loose to prevent the specimen from deformation or falling off.
4.4 press the holder to freeze the sample, and start the timing control switch (or press the stopwatch) to time. The freezing time of the sample is 3.0 ± 0.5min. During the freezing period, the temperature fluctuation of freezing medium shall not exceed ± 1 ℃.
4.5 lift the lifting gripper so that the impactor impacts the specimen within half a second.
4.6 take down the sample, bend the specimen to 180 ° according to the impact direction, and carefully observe whether there is any damage.
4.7 after the sample is impacted (each sample is only allowed to be impacted once), in case of damage, the temperature of the frozen medium shall be increased, otherwise, the temperature of the frozen medium shall be reduced and the test shall be continued.
Through repeated tests, the minimum temperature for at least two specimens not to be damaged and the maximum temperature for at least one specimen to be damaged are determined. If the difference between the two results is no more than 1 ℃, the test is over.
 
5、 Test standard
5.1 specifications
The sample is 25.0 ± 0.5mm long, 6.0 ± 0.5mm wide and 2.0 ± 0.3mm thick.
Type a sample can be prepared by another method. Only the double-sided parallel sharp knife edge is used for punching, and then the strip sample is cut into the specified length.
 
5.2 requirements
The surface of the sample should be smooth without foreign impurities and damage. The finished product should be cut to the corresponding size after grinding.
6、 Precautions
6.1 do not cut off the cooling cycle during the test, otherwise it will produce the effect of refrigeration.
6.2 the cylinder pressure has been adjusted before delivery and can not be changed arbitrarily.
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