Construction method of static and dynamic tensile ozone aging test chamber

The ozone aging test chamber is one of the main products of Wuhe. The equipment is delivered to the door, installed and debugged, and comes with one-year free after-sales and lifelong maintenance.

Refer to and implement standards
GB/T 13642-92 Vulcanized rubber - Ozone aging resistance test - Dynamic tensile test method;
GB/T 7762-2003 Rubber, vulcanized or thermoplastic - Static tensile test method for resistance to ozone cracking;
GB/T 2951.1-2951.0-1997 General Test Methods for Insulation and Sheath Materials of Cables;
And the test methods specified in other relevant standards.

1、 Control system
The temperature, humidity and concentration control part of the equipment adopts Taiwan, China PLC programmable controller, which is simple in programming, stable in temperature, humidity and concentration control, and large screen touch screen display and operation. The main electrical components of the equipment, such as circuit breakers, AC contactors, and small relays, are all made of Schneider brand, while other electrical accessories are made in China.

The time controller of the equipment controls the time required for the experiment and is easy to operate. When the device reaches the set time of operation, it automatically stops the test and enters a state of equilibrium to cool down.

2、 Main technical parameters
1. 型号 工作室尺寸 （D×W×H） 外形尺寸 （D×W×H） 功率
QL—100 400×500×500 1000×900×1400 2.5KW
QL—150 500×500×600 1100×900×1500 2.5KW
QL—225 500×600×750 1100×950×1600 3.5KW
QL—500 700×800×900 1300×1200×1700 6.0KW
QL—800 800×1000×1000 1400×1400×1850 7.5KW
QL—010 1000×1000×1000 1600×1400×1850 9.5KW
2. Temperature range: RT+10 ℃~50 ℃
3. Temperature uniformity: ≤ 2 ℃
4. Temperature fluctuation: ± 0.5 ℃/H
5. Temperature deviation: ≤± 2 ℃
6. Time setting range: 0-999 hours
7. Ozone concentration: 0-500PPHM, 0-1000PPHM
8. UV detection probe, long lifespan, high accuracy
9. Sample rack speed: (20-25) mmS (adjustable)
10. The time for the same specimen to rotate once is 8-12 minutes
11. Odorous oxidation air flow rate: 8-16mmS
12. Fixture elongation: 5% to 35%
13. Power supply voltage: AC 380V

3、 Heating and cooling system
1. Using far-infrared nickel alloy high-speed heating wire;
2. An independent system that does not affect low-temperature testing and ozone aging testing;
3. The temperature control output power is calculated by a microcomputer to achieve high-precision and high-efficiency electricity efficiency;
4. Compressor: 1 set of fully enclosed French Taikang;
5. Cooling method: air cooling;
6. Refrigerant: R22;
7. The entire system pipeline undergoes a 48 hour leak detection test with ventilation and pressurization;
8. The heating and cooling system is independent;
9. Internal spiral refrigerant copper tube;
10. Slope evaporator;
11. The dry filter, refrigerant flow window, repair valve, oil separator, solenoid valve, and storage tank are all original parts.

4、 Working principle
With the rapid development of modern industrial technology, the application fields of rubber and plastic products are becoming increasingly broad, and the environmental conditions they experience are becoming more complex and diverse. Only by reasonably defining the environmental conditions of the product and selecting the correct environmental protection measures can we ensure that the product is not damaged during storage and transportation, and is safe and reliable during use.

The low content of ozone in the atmosphere is the main factor causing rubber cracking. The ozone aging chamber simulates and strengthens the ozone conditions in the atmosphere, studies the effect of ozone on rubber, and quickly identifies and evaluates the anti ozone aging performance of rubber and the protective effectiveness of anti ozone agents. Effective anti-aging measures are then taken to improve the service life of rubber products. The ozone generator used in the equipment adopts a medium frequency and high voltage power supply method. The quartz glass tube electrode of the welding process produces stable ozone concentration, which is mixed with a certain amount of processed air in the exchanger and sent to the test chamber. The continuous online detection of ozone concentration is fed back to the ozone generator control system using a UV ozone concentration detector, so that the control system effectively controls the generation of ozone according to the set value, thereby maintaining the appropriate ozone concentration in the test chamber. The control system adopts PLC programmable controller. Also operated by a heating and humidification system to meet all temperature and humidity test conditions.

The ozone aging test equipment can be used for rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheaths, etc. Under static or continuous dynamic tensile deformation, or under intermittent dynamic tensile and static tensile alternating deformation, exposed to sealed and unlit air containing a constant ozone concentration and a constant temperature test box, the test samples are tested for a predetermined time to evaluate the ozone aging resistance of the rubber from the degree of cracking or other performance changes that occur on the surface of the sample.

Static tensile test
The standard stipulates that the two ends of the sample should be clamped on a fixture, and a tensile elongation of 20% should be selected. The fixture should be installed on a rotating sample holder with a rotation speed between (20-25) mm/S. The test should be conducted at a temperature of (40 ± 2) ℃, a relative humidity of no more than 65%, and a specified ozone concentration. Check the cracking condition of the sample after the specified time. The general selection of ozone concentration is (50 ± 5) × 10-8.

Dynamic tensile test
The standard stipulates that the sample fixture can automatically stretch and reset the sample, with a stretching frequency of 0.5 ± 0.025Hz. The two ends of the sample are clamped on the fixture, and the sample is cyclically stretched from 0 to the maximum elongation. The fixture is installed on a rotating sample holder, with a rotation speed of (20-25) mm/S. At a temperature of (40 ± 2) ℃, a relative humidity of not more than 65%, and a specified ozone concentration, the fixture is cyclically stretched and reset and rotated with the sample holder for testing. Check the cracking condition of the sample after the specified time. The general selection of ozone concentration is (50 ± 5) × 10-8.
Dynamic tensile testing is divided into continuous dynamic tensile testing and intermittent dynamic tensile testing.

5、 Structure of ozone aging test chamber
The ozone aging test equipment is made of high-quality materials, and the surface of the shell is treated with spray coating, which is beautiful and smooth. The color matching is coordinated and the lines are smooth. The inner liner is designed to be a sealed space without direct sunlight during operation, where samples can be placed for aging tests. It can maintain a constant temperature difference of ± 2 ℃ during testing and is made of high-quality stainless steel plates. The indoor sample racks, fixtures, conduits, and other accessories are made of materials such as stainless steel and aluminum that are not easily decomposed by ozone and affect ozone concentration. The lifting height, frequency, and amplitude of the dynamic sample holder can be adjusted. The sample holder can rotate 360 degrees with adjustable speed.

Construction method of static and dynamic tensile ozone aging test chamberSet a transparent window at a reasonable position on the box door to observe changes in the indoor sample. The observation window adopts multi-layer hollow tempered glass, which has the advantages of transparency, heat insulation, and is not prone to steam frosting.

The interlayer between the inner and outer shells of the ozone aging test equipment is filled with high-density glass fiber cotton to ensure that the box will not experience excessive temperature fluctuations due to temperature conduction, and the temperature of the sample will remain constant throughout the test process.

The ozone aging test equipment uses a long axis fan motor for stirring and a stainless steel multi blade impeller that is resistant to high and low temperatures to achieve strong convection and vertical diffusion circulation, ensuring uniform and stable temperature in the laboratory.

Construction method of static and dynamic tensile ozone aging test chamberA double-layer high-temperature resistant high tensile sealing strip is used between the door and the box to ensure the sealing of the testing area. Using non reactive door handles makes operation easier. Set one or more testing holes in a reasonable position on the left side of the box, which can be connected to external testing power or signal lines. The arrangement of hole diameter or number of holes should be indicated by the user.

High quality fixed PU movable wheels are installed at the bottom of the machine, which can easily move the machine to its position and fix the casters afterwards.

7、 Ozone generator
The electrode adopts a quartz glass tube electrode with welding technology, which is free of impurities and adhesive sealing, and is not prone to electrode breakdown and aging. The electrode has a long service life. However, the high-frequency surface discharge ceramic corona generator is limited by the ceramic substrate manufacturing process, and the electrode is prone to breakdown when used under different environmental humidity conditions.

Due to the use of medium frequency and high voltage power supply, the electrodes do not generate corona overheating, resulting in stable ozone concentration and no decrease in ozone concentration with working time or gas flow rate. The high-frequency surface discharge ceramic corona generator, due to the use of high-frequency voltage discharge, causes ozone to decompose due to overheating when the temperature in the discharge area cannot be effectively dissipated. It is suitable for use under high airflow conditions.

No vulnerable components, maintenance free operation, it is a long-life type. However, high-frequency surface discharge ceramic corona generators are prone to the formation of oxide deposits on the surface of ceramic electrodes. When the surface oxide is too thick, corona blockage is likely to occur. If not cleaned in time, ozone will not be generated.
1. Input voltage: 220V
2. Current: 300mA
3. Manual and automatic adjustment of concentration
4. Concentration range: 0-100%
5. Analog input voltage: 0-10VDC
6. Analog output voltage: 0-1VDC
7. Maximum concentration of ozone: 120gO3/m3
8. Ozone production (oxygen intake, flow rate of 100L/h) 3.5gO3/h
9. Electrode cooling method: forced air cooling
10. Operating pressure: less than 0.2Mpa
11. Multiple groups can be used in parallel to meet design requirements.

8、 Protection system
1. Overall equipment overheating;
2. The overall equipment is out of phase/reverse phase;
3. Overall equipment overload;
4. Refrigeration unit overpressure;
5. Overall equipment timing;
6. Other protections include leakage, operation indication, automatic shutdown after fault alarm, etc.

9、 Random data
Equipment qualification certificate, warranty card, packing list, equipment user manual, instrument and personal appliance user manual, equipment electrical schematic diagram, random spare parts, vulnerable parts, etc

10、 Delivery Instructions
The supplier is responsible for delivering the goods to the customer's doorstep, introducing installation and debugging operations, until the customer's employees operate independently. The quality warranty period is one year, starting from the date of installation and acceptance. The supplier promises to provide spare parts for life. If after-sales service must be provided on-site, the supplier will arrive at the site within the customer's time.

11、 Equipment usage conditions
1. Environmental temperature: 5 ℃ to+28 ℃ (average temperature within 24 hours ≤ 28 ℃)
2. Environmental humidity: ≤ 85%
3. Power requirements: AC 220V 380V