Measuring principle of tensile machine:

1.The force value of the tensile testing machine is measured through a load cell, amplifier and data processing system. Under the premise of small deformation, the strain e at a certain point of an elastic element is proportional to the force on the elastic element, and also proportional to the elastic deformation. Taking the S-type testing machine sensor as an example, when the sensor is subjected to the effect of tensile force P, since a strain gauge is attached to the surface of the elastic element, and the strain of the elastic element is proportional to the magnitude of the external force P, the strain gauge is connected to the measurement circuit. , you can measure its output voltage and then measure the force.

2. The deformation of the tensile machine is measured through the deformation measuring device, which is used to measure the deformation of the sample during the experiment. The device has two chucks, which are connected to the photoelectric encoder installed on the top of the measuring device through a series of mechanical mechanisms. When the distance between the two chucks changes, the shaft of the photoelectric encoder is driven to rotate, and the photoelectric encoder There will be a pulse signal output. This signal is then processed by the processor, and the deformation of the sample can be obtained.

3. The principle of measuring the displacement of the tensile machine beam is roughly the same as that of the deformation measurement. The displacement of the beam is obtained by measuring the output pulse number of the photoelectric encoder.

How to operate:

(1) Regarding the loading and unloading of specimens: The round specimen is clamped in the center of the round jaw clamp, and the specimen is clamped. The flat specimen must be perpendicular to the fixture and cannot be skewed. The clamping part must be long enough, at least 3/4 of the length of the clamping block. When the upper and lower chucks are clamped, it is prohibited to raise or lower the beam.

(2) Regarding force value clearing: used to display sampled data, there is a sensor bar on the main interface of the software. The electronic tensile testing machine can display the values of 4 types of sensors, namely test force, displacement, extensometer, and peak force. Usually after clamping the test piece and installing the extensometer, each sensor must be cleared before the test can be started. However, the reset of the force sensor is more special. First, clamp the upper chuck of the stretching fixture, then adjust the lower beam to the appropriate position, clear the force value, and then clamp the lower chuck.

(3) Permanent deformation: After the load is removed, the material still remains deformed.

(4) Yield point: When the material is stretched on an electronic tensile testing machine, the deformation increases but the stress remains unchanged. This point is the yield point. The yield point is divided into upper and lower yield points, and the upper yield point is usually used as the yield point. Yield: The load exceeds the proportional limit and is no longer proportional to the extension. The load will drop suddenly, and then fluctuate up and down over a period of time, and the extension will change greatly. This phenomenon is called yielding.

(5) Yield strength: When stretching, the load at which the permanent elongation reaches a certain specified value is divided by the original cross-sectional area of the parallel part.

(6) Spring K value: the ratio of the weight of the force in the same phase as the deformation and the deformation.

(7) Effect elasticity and hysteresis loss.

Email: hello@utstesters.com

Direct: + 86 152 6060 5085

Tel: +86-596-7686689

Web: www.utstesters.com

The ICI pilling tester is suitable for detecting the pilling phenomenon caused by friction on the fabric surface without pressure, and is suitable for woven and knitted fabrics.

Meet the standards:

ASTM D3939, GB/T 11047, JIS L1058

Scope of application:

The ICI hammer-type snagging tester can quickly detect the ease of fabric snagging (that is, the yarn is hooked out of the fabric) under normal wearing conditions.

Product introduction:

This instrument is equipped with an observation box and comparison pattern cards of different fabric structures. Equipped with 4 test rollers (covered with the fabric to be tested), the hammer ball is a tungsten carbide head and is controlled by a predetermined electronic counter.

Instrument description:

This tester is suitable for testing knitted and woven outerwear fabrics and other fabrics that are prone to snagging. It is especially suitable for testing the snagging performance of chemical fiber filaments and their deformed yarn fabrics.

Precautions for using ICI Pilling Tester:

1. The voltage should be maintained stable during use to avoid burning out the power supply.

2. Clean the cork liner regularly with a suitable cleaning solvent, such as industrial methylated spirit or trichloroethane.

3. When replacing the experimental tube, the new experimental tube must be inspected before use.

4. Regularly check whether the control panel buttons and screws in various parts are normal.

5. Clean the instrument before and after each experiment to ensure that all lint and debris are removed from the box.

6. The reference fabric should be retested every six months and compared with the original test specimen.

Email: hello@utstesters.com

Direct: + 86 152 6060 5085

Tel: +86-596-7686689

Web: www.utstesters.com

This machine can be used to test the bursting strength and height of woven, knitted, non-woven fabrics, paper or sheets. The instrument uses hydraulic blasting to act on a specific area of rubber film, and then acts on the sample to force the fabric to burst.

Principle: A digital burst strength tester can detect the burst strength of knitted fabrics, apply oil pressure to a rubber membrane in a specific area, and then force the fabric to burst. This instrument is equipped with a pressure display, peak hold record and peak upper limit setting, replaceable rubber diaphragm, and manual clamping device.

Comply with standards: ISO 13938-1/3689/3303/2758, ERT 80-4-20, ASTM D3786 BS 3137/3424(PT6)/4768, GB/T 7742.1

Features:

①.Full test area support, suitable for different standard requirements, in line with the GB standard with a maximum test area of 100cm2; ②. Support PC-side online communication, statistical analysis of results, and test reports can be printed; ③. Pneumatic clamps, the clamping force is firm and even , can be applied to clamping various materials in an all-round way; ④. The test results are richly expressed and can display such as: bursting strength, bursting strength, diaphragm pressure, bursting height, bursting time; convenient for quality control personnel to fully understand bursting performance of the sample.

Test steps: Place all samples under the standard atmospheric conditions required by the standard to adjust humidity and balance, and prepare test samples of the required size.

①. Manual test:

1. Installation of test sample. Place the humidity-adjusted sample into the middle and lower part of the clamp, and tighten the sample along the plane to avoid wrinkles. Place the test cup above the test sample

2. Rotate the handwheel clockwise at a speed of 120 rpm until the sample breaks. Stop rotating the handwheel at the moment the sample breaks. After the sample breaks, quickly loosen the clamp ring on the sample. Rotate the hand lever counterclockwise to the starting point to relax the film. Record the pressure required to expand the film and record the total pressure required for the sample to break. . NOTE If the dial shows that the pressure has stopped rising but the sample has not ruptured, push the lever to remove the pressure. Record the elongation of the sample beyond the measuring limit of the testing machine.

② Automatic test:

Place the humidity-adjusted sample into the middle and lower part of the clamp, and tighten the sample along the plane to avoid wrinkles. Place the test cup above the test sample and move the operating handle to the left to expand the film. While the membrane expands, hold the latch on the lower or right side of the operating lever. When the sample breaks, try to rotate the latch so that the operating lever returns to the middle position. Record the total pressure required to rupture the sample. After the sample breaks, quickly loosen the clamp ring on the sample, swing the latch to its normal position, remove the pressure on the membrane, push the operating lever to the right, and record the pressure required to expand the membrane.

Email: hello@utstesters.com

Direct: + 86 152 6060 5085

Tel: +86-596-7686689

Web: www.utstesters.com

As consumer demands for food safety and quality continue to rise, the production of dried fruits such as raisins increasingly relies on efficient and precise automated equipment. GroTech’s AI Color sorting machine, It ensures efficient and accurate sorting, enhancing raisin quality by removing mold, spoilage, and foreign objects, thereby improving both food safety and market competitiveness.

Challenges in Raisin Sorting

During processing, raisins often develop color variations, mold, insect damage, and impurities due to environmental factors such as weather, storage conditions, and transportation. Traditional sorting methods rely heavily on manual labor, which, despite completing the task to some extent, are inefficient and prone to human error. This makes large-scale standardized production difficult.
Therefore, the industry faces a critical challenge: integrating intelligent equipment capable of efficient and precise sorting into raisin production.

GroTech's AI Color Sorting Machine Solution

GroTech’s AI color sorting machine combines artificial intelligence algorithms with high-precision image recognition technology to identify defects such as color differences, blemishes, mold, and foreign objects on raisins, thereby automatically rejecting substandard products. Key advantages include:

(1)High-Precision Color Recognition
The AI sorting machine uses multispectral image sensors to detect subtle color differences on raisins, including mold, spoilage, or moisture damage. IThese imperfections, often invisible to the naked eye, are accurately identified and removed, ensuring uniform color across batches.

(2)Intelligent Removal of Mold and Foreign Objects
Using deep learning algorithms, the AI sorting machine can recognize mold spots, insect damage, or foreign objects on the surface of raisins. These non-compliant raisins are efficiently removed, ensuring only high-quality products enter the market, safeguarding consumer health and safety.

(3)Automated High-Speed Processing
The AI sorting machine enables full automation of raisin production lines. It performs real-time detection and processing during high-speed operations, dramatically boosting efficiency while maintaining consistent quality.

(4)Enhancing Product Appearance and Market Competitiveness
Since raisin appearance significantly influences consumer purchasing decisions, the machine ensures uniformity in size, shape, and color. This elevates the product’s visual appeal, aligning with market demands for high-quality food and strengthening brand competitiveness.

Technical Advantages of the AI Color Sorting Machine

（1） Deep Learning Algorithms
GroTech’s AI sorting machine employs deep learning technology, enabling the system to autonomously learn and optimize sorting strategies. By continuously accumulating production data, the system adjusts to different materials and production environments, improving sorting efficiency.

（2）High-Speed and High-Precision
Equipped with high-speed cameras and processing units, the sorting machine captures and processes images of each raisin in real time. This combination of speed and accuracy ensures even minute defects are detected.

（3）Remote Monitoring and Data Analysis
With cloud computing and big data analysis, users can monitor the sorting machine’s performance in real time and adjust production parameters accordingly. Data analysis also provides insights into production quality trends, enabling further optimization of production management.

（4）Reduced Labor Costs and Increased Efficiency

Compared to manual sorting, the AI solution minimizes labor dependency, reducing costs while increasing throughput. Its high-volume processing capability ensures seamless large-scale production

Application Examples

GroTech’s AI color sorting machine has been widely adopted by raisin producers. For example, a leading manufacturer reported improved product consistency and appearance after implementation. The machine’s ability to detect contaminants also increased pass rates, bolstering brand trust.

When it comes to purchasing an industrial chiller, one of the most important decisions you'll face is whether to go with an air cooled chiller or a water cooled chiller. Both options offer effective cooling solutions, but each comes with its own set of advantages and limitations depending on your specific needs, operational environment, and budget. In this blog, we’ll break down the differences between these two types of chillers and help you determine which one is best suited for your business.

What Are Air Cooled and Water Cooled Chillers?

Before diving into the pros and cons, it’s important to understand the basic differences between air cooled and water cooled chillers.

Air Cooled Chillers: These chillers use the surrounding air to dissipate heat. The condenser is equipped with fans that blow air through the condenser coils to cool down the refrigerant.

Water Cooled Chillers: These units use water to absorb and carry away heat from the refrigerant. A cooling tower, often placed outside the building, circulates water to absorb heat and releases it into the atmosphere.

1. Installation and Space Considerations

Air Cooled Chillers are generally easier and quicker to install. Since they rely on air for cooling, there's no need for external cooling towers or additional water treatment systems. This makes them an ideal choice for businesses that may have limited space or those that need a more flexible, less complex installation process. They are perfect for smaller facilities or those located in areas where space is limited.

On the other hand, Water Cooled Chillers require additional infrastructure, including a cooling tower and water circulation systems. This means they take up more space and may require more time and cost to install. They are typically used in larger operations or facilities with more space available for the required systems.

2. Energy Efficiency

When it comes to energy consumption, Water Cooled Chillers generally perform better in larger applications or facilities that require consistent and reliable cooling. They are more energy-efficient in the long run because they tend to operate at a lower temperature, which can reduce overall energy usage. Water’s higher thermal conductivity allows it to absorb more heat, making these chillers better suited for high-capacity cooling needs.

However, Air Cooled Chillers can be a more cost-effective solution for smaller systems or applications with less demanding cooling requirements. While they might consume more energy than their water cooled counterparts under heavy loads, they are typically sufficient for moderate cooling needs and may result in lower initial installation costs.

3. Maintenance and Operation Costs

Air Cooled Chillers are generally easier to maintain because they do not have the additional components of a cooling tower or water circulation systems. Maintenance tends to be simpler, with fewer parts to inspect and clean. However, because they rely on outdoor air for cooling, they can accumulate dirt and debris, which might require more frequent cleaning of the condenser coils.

Water Cooled Chillers require more regular maintenance, especially for the cooling tower, water pumps, and pipes. Additionally, you need to keep an eye on water quality, as scaling, corrosion, and bacteria growth can develop in the system if not treated properly. While maintenance costs can be higher, the overall lifespan and efficiency of water cooled systems can make them more cost-effective in larger, industrial applications.

4. Environmental Impact and Noise

Air Cooled Chillers tend to be more environmentally friendly in terms of water consumption since they don’t rely on large amounts of water for cooling. However, they can generate more noise due to the fans used to circulate air through the condenser. This can be a concern in noise-sensitive areas or in places where sound regulations are strict.

Water Cooled Chillers, on the other hand, tend to operate more quietly, but they require a constant supply of water, which can be a concern in regions with water shortages or strict water usage regulations. Moreover, the energy consumption of water cooled chillers can indirectly contribute to environmental impact, especially in regions where electricity comes from non-renewable sources.

5. Best Use Cases

Air Cooled Chillers are a great choice for:

• Small to medium-sized operations.
• Facilities with limited space or where water use is a concern.
• Locations where installation speed and simplicity are critical.
• Situations where quieter operation is less important.

Water Cooled Chillers are ideal for:

• Large industrial applications or facilities with high cooling demands.
• Locations with ample water supply and space for cooling towers.
• Operations looking for long-term energy efficiency and higher cooling capacity.
• Businesses that require quieter operation and can handle the maintenance demands.

Choose an air cooled chiller if you’re operating in a smaller facility, have limited space, or need a simpler, lower-cost solution.

Opt for a water cooled chiller if you need more energy efficiency, have the space for additional infrastructure, and are running a large-scale operation with heavy, continuous cooling requirements.

At the end of the day, both types of chillers can provide reliable and efficient cooling solutions—it's all about choosing the one that best aligns with your business needs and operational goals.

Hope this helps guide you in your decision-making process! If you need more details or personalized advice, feel free to contact us at Hengde company for expert recommendations on the best chiller systems for your business.

Accelerated Test of Die Casting at High Temperature and High Humidity

Die casting is a precision casting method, the principle is to melt the better metal [zinc, tin, lead, copper, magnesium, aluminum]... Six kinds of alloy melting, with rapid high pressure mechanical properties into the metal mold, the use of steel mold low temperature rapid solidification molding casting method, die casting is a pressure casting parts, can be manufactured into auto parts, locomotive parts, LED lamps and LED street lights, consumer electronics parts, cameras, mobile phones, communications... In order to confirm whether the die-casting parts can be satisfied with the outdoor environment for a long time and whether there will be related defects, relevant tests need to be carried out through the HAST highly accelerated life testing machine.

Common defects in die casting: cold insulation, cracks, holes

List of common specifications for die casting:

ASTM B85: Standard for pressed Film Casting of aluminum alloys

ASTM B86: Zinc and zinc aluminum alloys

ASTM B176: Copper Alloy die castings

ASTM B894: Zinc-Copper-Aluminum Alloy die casting

ASTM E155: Standard Reference Radiographs for the inspection of Aluminum & Magnesium castings

ASTM B94: Magnesium Alloy mold standard

GB5680: high manganese steel casting

GB9438: Aluminum alloy casting

GB15114: Aluminum alloy die casting

QC273: Technical specifications for automotive zinc alloy aluminum alloy copper alloy die casting parts

YL-J021201: die casting of aluminum alloy cover plate for machine cooler

Die casting test items: metallographic test, mechanical ability, bending test, hardness test, impact test, tensile test, high temperature and high humidity, chemical composition, non-damage inspection (X-ray, fluorescence), residual element analysis, surface defects, dimensional tolerance, microstructure, weight tolerance, air tightness test

Die casting Performance test - high temperature and high humidity accelerated test:

PCT condition: 120℃/100%R.H.

HAST condition: 130℃/85%R.H.

Common missing after high temperature and high humidity accelerated test of die casting:

Die casting in the manufacturing process, if the cleaning is not true, resulting in residual release agent, cutting fluid, saponification fluid on the surface... Such corrosive substances, or other pollutants, under certain temperature and humidity conditions, it is easy to accelerate oxidation or mold, die-casting test product surface with a layer of white powder or yellow, black are oxidation phenomenon.

Autoclave or Pressure Cooker Test (PCT)

Autoclave Test, or Pressure Cooker Test (PCT), or Pressure Pot Test (PPOT), is a reliability test performed to assess the ability of a product to withstand severe temperature and humidity conditions. 

It is used primarily to accelerate corrosion in the metal parts of the product, www.hast.cn including the metallization areas on the surface of the die. It also subjects the samples to the high vapor pressure generated inside the autoclave chamber. Figure 1 shows examples of autoclave chambers.

Fig. 1. Examples of Autoclave Chambers from Trio Tech

Autoclave testing consists of soaking the samples for 168 hours at 121 deg C, 100% RH, and 2 atm.  Intermediate readpoints at 48H and 96H may also be employed.  

Surface-mount samples are preconditioned prior to autoclave testing.www.hast.cn. Preconditioning simulates the board mounting process of the customer. It normally consists of a bake to drive away the moisture inside the packages of the samples, a soak to drive a controlled amount of moisture into the package, and three cycles of IR or vapor reflow.  

The samples are tested after preconditioning, failures from which are considered as preconditioning failures and not autoclave failures. Preconditioning failures should be taken seriously, since these imply that the samples are not robust enough to even withstand the board mounting process.

Fig. 2. Another Example of an Autoclave Chamber

Because of the extreme moisture condition during autoclave testing, moisture-related electrical leakage failures may be encountered after the test. Unless predefined to be so, www.hast.cn such failures must not be considered as valid PCT failures. Only permanent failures, such as those arising from corrosion, are considered valid PCT failures.                  

Reliability Tests:  Autoclave Test or PCT; Temperature Cycling; Thermal Shock;

THB; HAST; HTOL; LTOL; HTS; Solder Heat Resistance Test (SHRT); 

Other Reliability Tests

See Also: Reliability Engineering;  Reliability Modeling;

Qualification Process; Failure Analysis; Package Failures; Die Failures

Comprehensive Test Chamber

Equipment features:

Can be connected to a vertical vibration table or to both vertical and horizontal vibration tables simultaneously;

You can choose functions such as device lifting and device translation;

High strength and high reliability structural design - ensuring the high reliability of the equipment;

The studio material is SUS304 stainless steel - with strong corrosion resistance, cold and hot fatigue function, and long service life;

High density polyurethane foam insulation material - ensuring minimal heat loss;

Surface spraying treatment - ensuring the long-lasting anti-corrosion function and appearance life of the equipment;

High strength heat-resistant silicone rubber sealing strip - ensures high sealing performance of equipment doors;

Multiple optional functions (such as test holes, recorders, water purification systems, etc.) ensure that users have multiple functions and testing needs;

Large area electric anti frost observation window and concealed lighting - can provide good observation effect;

Environmentally friendly refrigerants - ensure that equipment better meets your environmental protection requirements;

Customizable size/usage indicators/various optional functions according to user requirements

Temperature control

Can achieve temperature constant control and program control;

The full process data recorder (optional function) can achieve full process recording and traceability of the experimental process;

Each motor is equipped with overcurrent (overheating) protection/heater short-circuit protection to ensure high reliability of air flow and heating during equipment operation;

USB interface and Ethernet communication function enable the device's communication and software expansion functions to meet various customer needs;

Adopting the internationally popular cooling control mode, the compressor cooling power can be automatically adjusted from 0% to 100%, reducing energy consumption by 30% compared to the traditional heating balance temperature control mode;

The key components of refrigeration and electrical control are all made of internationally renowned brand products, which improves and ensures the overall quality of the equipment;

The equipment meets the following standards

GB/T 10592-2008 Technical Conditions for High and Low Temperature Test Chambers

GB/T 10586-2006 Technical Conditions for Damp Heat Test Chamber

GB/T 2423.1-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test A: Low Temperature

GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test B: High Temperature

GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test Cab: Constant Damp Heat Test

GB/T 2423.4-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test Db: Alternating Damp Heat (12h+12h Cycle)

GB/T 2423.22-2008 Environmental testing for electrical and electronic products - Part 2: Test methods - Test N: Temperature changes

GB/T 5170.1-2008 General Principles for Inspection Methods of Environmental Testing Equipment for Electrical and Electronic Products

GJB 150.3A-2009 Military Equipment Laboratory Environmental Test Methods Part 3: High Temperature Test

GJB 150.4A-2009 Military Equipment Laboratory Environmental Test Methods Part 4: Low Temperature Test

GJB 150.9A-2009 Military Equipment Laboratory Environmental Test Methods Part 9: Damp Heat Test

Choosing different vibration table bodies can meet different vibration standard test methods

(e.g. GB/T 2423.35-2005, GB/T 2423.36-2005, etc.).

Three comprehensive test chambers; Temperature, humidity, and vibration three comprehensive test chamber; Technical specifications for temperature/humidity/vibration/three comprehensive testing equipment.

Daily maintenance tips for high and low temperature test chambers and alternating high and low temperature test chambers

1. High and low temperature test chambers are generally relatively high, and we recommend placing them in a relatively benign temperature environment. Our experience temperature value is 8 ℃~23 ℃. For laboratories that do not have this condition, appropriate air conditioners or cooling towers must be equipped.

2. It is necessary to adhere to professional management by dedicated personnel. Units with conditions should periodically send dedicated personnel to the supplier's factory for training and learning, in order to gain more professional experience and ability in maintenance and repair Hongzhan Instrument.

3. Regularly clean the condenser every 3 months: For compressors that use air-cooled cooling, the condenser fan should be regularly inspected and the condenser should be cleaned and dusted to ensure good ventilation and heat transfer performance; For compressors that use water-cooled cooling, in addition to ensuring their inlet water pressure and temperature, it is also necessary to ensure the corresponding flow rate. Regular cleaning and descaling of the condenser interior is also necessary to obtain its continuous heat transfer performance.

4. Regularly clean the evaporator: Due to the different cleanliness levels of the test samples, a lot of small particles such as dust will accumulate on the evaporator under forced air circulation, and should be cleaned regularly.

5. Cleaning and balancing of circulating air blades and condenser fans: Similar to cleaning evaporators, due to the different working environments of the test chamber, many small particles such as dust may accumulate on the circulating air blades and condenser fans, and should be cleaned regularly.

6. Cleaning of waterway and humidifier: If the waterway is not smooth and the humidifier scales, it is easy for the humidifier to dry and burn, which may damage the humidifier. Therefore, it is necessary to regularly clean the waterway and humidifier.

7. After each experiment, set the temperature near the ambient temperature, work for about 30 minutes, then cut off the power and clean the inner wall of the workshop.

If the equipment needs to be relocated, it is best to do so under the guidance of technical personnel from Hongzhan Company to avoid unnecessary damage or damage to the equipment.

When the product is not in use for a long period of time, it should be powered on regularly every half month, and the power on time should not be less than 1 hour.

10. Maintenance principle:

Due to the fact that high and low temperature test chambers are mainly composed of electrical, refrigeration, and mechanical systems, once there is a problem with the equipment, a comprehensive inspection and analysis of the entire equipment system should be carried out.

Generally speaking, the process of analysis and judgment can start with "external" and then "internal", that is, after excluding external factors, the equipment can be systematically decomposed based on the fault phenomenon. Then, the system can be comprehensively analyzed and judged. Alternatively, the reverse reasoning method can be used to find the cause of the fault: first, check whether there is a problem with the electrical system according to the electrical wiring diagram, and finally check whether there is a problem with the refrigeration system. Before understanding the cause of the fault, it is not advisable to disassemble or replace components blindly to avoid unnecessary trouble.

EC-85EXT, Superior constant temperature bath (800L)Specifications