Structural characteristics of temperature and humidity control box

The full name of the temperature and humidity control chamber is "Constant Temperature and Humidity Test Chamber", which is an essential testing equipment in aviation, automotive, home appliances, scientific research and other fields. It is used to test and determine the parameters and performance of electrical, electronic and other products and materials after high temperature, low temperature, humidity and heat or constant temperature environment changes. It can be mainly divided into "desktop" and "vertical" according to testing requirements and standards, with the difference being the temperature and humidity that can be achieved. The vertical type can be used for low temperature and drying below room temperature, while the desktop type can only be used for temperature and high humidity above room temperature.

Suitable for various small electrical appliances, instruments, materials, and components for wet heat testing, it is also suitable for conducting aging tests. This test chamber adopts the most reasonable structure and stable and reliable control method currently available, making it aesthetically pleasing, easy to operate, safe, and with high precision in temperature and humidity control. It is an ideal equipment for conducting constant temperature and humidity tests.

1) The test box body is in the form of an integral structure, with the refrigeration system located at the lower rear of the box and the control system located at the upper part of the test box.

(2) Inside the air duct interlayer at one end of the studio, there are devices such as heaters, refrigeration evaporators, and fan blades distributed; On the left side of the test box, there is a Ø 50 cable hole, and the test box is a single door (stainless steel embedded door handle)

(3) The double-layer high temperature and anti-aging silicone rubber seal can effectively ensure the temperature loss of the test chamber

(4) There are observation windows, frost prevention devices, and switchable lighting fixtures on the box door. The observation window adopts multi-layer hollow tempered glass, and the inner adhesive sheet conductive film is heated and defrosted. The lighting fixtures use imported brand Philips lamps, which can effectively observe the experimental changes in the studio from all angles.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

Temperature control of solar simulation irradiation test chamber

The test chamber uses an artificial light source combined with a G7 OUTDOOR filter to adjust the system light source to meet the requirements of IEC61646 for solar simulators by simulating the radiation in natural sunlight. The above system light source is used to conduct the IEC61646 photoaging test on the solar cell module, and the temperature on the back of the module needs to be constantly controlled between 50 ± 10℃during the test. Can automatically monitor temperature; Configure a radiometer to control the irradiance of light, ensuring it remains stable at a specified level, while also controlling the testing time.

During the ultraviolet light cycle period in the solar simulation irradiation test chamber, photochemical reactions are usually not sensitive to temperature. But the rate of any subsequent reaction depends on the temperature. The rate of these reactions accelerates with increasing temperature. Therefore, controlling the temperature during UV exposure is crucial. In addition, it is necessary to ensure that the temperature of the accelerated aging test is consistent with the highest temperature at which the material is directly exposed to sunlight. In the solar simulation irradiation test chamber, the UV exposure temperature can be set at any temperature between 50 ℃ and 80 ℃ based on the illuminance and ambient temperature. The UV exposure temperature is adjusted by a sensitive temperature controller and blower system to achieve excellent uniformity in the temperature of this test chamber.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

UV aging tester testing equipment

The structure of the test chamber is made of corrosion-resistant metal materials, including 8 fluorescent ultraviolet lamps, a water tray, a test sample holder, and temperature and time control systems and indicators.

2. The lamp power is 40W and the lamp length is 1200mm. The range of the uniform working area of the test box is 900 × 210mm.

3. The lights are installed in four rows, divided into two rows. The tubes of each row of lights are installed in parallel, and the center distance of the lights is 70mm.

4. The test sample is fixedly installed at a position 50mm away from the surface of the lamp surface. The test sample and its bracket form the inner wall of the box, and their backs are exposed to cooling air at room temperature due to the temperature difference between the test sample and the air inside the box. To create stable condensation conditions on the surface of the test sample during the condensation stage, the test chamber should generate natural air convection through the outer wall of the chamber and the channel of the test sample at the bottom.

5. Water vapor is generated by a water tray located at the bottom of the heating box, with a water depth not exceeding 25mm, and equipped with an automatic water supply controller. The water tray should be regularly cleaned to prevent the formation of scale.

6. The temperature of the test chamber is measured by a sensor fixed on a black aluminum plate (blackboard) with a width of 75mm, height of 100mm, and thickness of 2.5mm. The blackboard should be placed in the central area of the exposure test, and the measurement range of the thermometer is 30-80 ℃ with a tolerance of ± 1 ℃. The control of lighting and condensation stages should be carried out separately, and the condensation stage is controlled by the heating water temperature.

7. The test chamber should be placed in a test room with a temperature of 15-35 ℃, 300mm away from the wall, and should prevent the influence of other heat sources. The air in the test room should not circulate strongly to avoid affecting the lighting and condensation conditions.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

Drone spraying is a new type of operation method in technological development. High work efficiency, suitable for large-scale agricultural pest control. This is tens or hundreds of times more than physical labor. It can complete tasks that are easy to manually complete, such as forest and mountain forest operations. So how effective are unmanned aerial vehicles used for medicinal purposes on rural land?

Things often have two sides, namely advantages and disadvantages. Drone spraying is no exception, each with its own advantages and disadvantages. The advantage is that the spraying speed is fast. The crop protection drones used for agricultural spraying are generally multi rotor aircraft, much larger than typical small aerial photography drones, with longer endurance and much faster speed. Not to mention, compared to manual spraying, the spraying efficiency of aircraft is hundreds of times higher.

In addition, crop protection drones can adopt two control methods: manual remote control and satellite guided control. Usually, large plots use satellite navigation to control spraying. For land parcels, seamless spraying can be achieved without losing crops. No matter how slow and careful manual spraying is, there will always be omissions at the beginning, which machines cannot match

The spraying quality is also very high. The principle of drone spraying is to install the medicine box on the body of the drone, open the valve after the drone takes off to discharge the medicine, and then use the strong wind generated by the high-speed rotation of the drone blades to atomize and blow down the medicine. Due to the strong atomization and falling of drugs by the wind, the adhesion and diffusion rate of drugs is higher than traditional manual spraying, so the effect of spraying drugs in this way is higher than manual spraying.

In fact, there are many potential safety hazards hidden in drones, and some issues have also been documented in previous reports. For example, during the process of spraying pesticides, if no pesticides are sprayed into the river, all organisms in the river will be poisoned. A clear river on the horizon is easily destroyed. If there are artificially cultivated aquatic products in the Tianbian River, it is easy to become an economic dispute if such a problem is encountered.

In addition, the promotion of drone pesticide spraying in modern rural areas is insufficient, and there are many regulatory loopholes. Relevant departments need to introduce policies to guide and manage it correctly, avoid irreparable losses caused by technical errors, and ensure the safety of drone pesticide spraying.

Therefore, if rural areas want to implement drone pesticide spraying, corresponding technical support must be provided first, and drone training must be provided to farmers to ensure that they use drones in the correct situations, thereby avoiding many problems. As long as they have sufficient technology, they must maintain consistency in the spraying process.

In addition, due to its fast speed, the effect of uniform application is poor. The drone spray passes through instantly, making it difficult to mix evenly and thoroughly. The only way to overcome the problem of uneven and thorough beating is to increase the concentration of the liquid medicine, thereby increasing the investment cost. For example, when spraying drugs in cotton fields, UAV spray can not kill cotton bollworm in cotton buds, aphids on the back and bottom of leaves.

Only by absorbing crops can endogenous pests be dealt with, and some pests may not be killed by endogenous agents but can only be dealt with through contact. The main disadvantage of manual spraying is slow speed, making it difficult to spray at high altitudes. It has the advantage of uniform application, which can evenly and thoroughly hit crops up and down. Save technical solutions.

Although there are many advantages to using drones to spray pesticides, such as high efficiency and good quality, there are also certain limitations. For example, it depends on weather conditions. It cannot take off in bad weather and cannot work all day. It is only suitable for the vast northern regions, while the southern mountainous and hilly areas are not particularly suitable for large-scale operations.

Generally speaking, using drones to spray pesticides on farmland is very cost-effective. Short time, uniform spraying, and affordable price. Therefore, more and more farmers are gradually choosing to use drones to spray pesticides on crops. There are also many smart young people who see the vast prospects of this industry, specializing in drone spraying, and the profits are still considerable.

Drones are a manifestation of high-tech technology applied in agriculture, and are a progressive product of the combination of modern technology and traditional agriculture. From an efficiency perspective, it is indeed higher than manual spraying. From a practical perspective, it cannot be compared to manual operation. Drones can only spray on the front of crops, but cannot spray on the back of crops.

When spraying pesticides, unmanned aerial vehicles also pay attention to the weather. Due to strong winds and heavy fog, it is impossible to operate, and manual operation can completely ignore this situation. Therefore, unmanned operation has its own advantages, and manual operation also has its advantages, which should be complementary. We cannot veto drones with one vote. We should view new things from a developmental perspective. Although there are drawbacks to drone operation, it is an assistant for the future development of agriculture.

The development process of agricultural drones can be divided into several important stages, each with its unique characteristics and milestones. ‌

Initial stage: Concept machine and demonstration machine

Conceptual stage (2010-2012): This stage mainly involves the dissemination of concepts, and the operational capabilities of crop protection drones are very limited, mainly used for small-scale demonstrations and testing within the industry.

Demonstration stage (2013-2015): With the advancement of technology, crop protection drones began to be demonstrated in farmland. Although their operational capabilities have improved, they have not yet reached the standard for large-scale application.

Development stage: trial application and batch application

Trial application stage (2016-2017): Plant protection drones began to be practically applied in farmland, and more and more practitioners entered this industry, further verifying the industry model and operational capabilities.

Batch application stage (2018-2020): Plant protection drones have the ability to make money, their business models and service capabilities are gradually maturing, and more social resources are entering this industry.

Mature stage: Wide application and future trends.

Widely used stage (2021 present): Plant protection drones have been fully accepted by the industry and cannot be replaced. All social resources know their purpose and have become a mature industry.

Future trend: Plant protection drones will further become intelligent and precise, improving operational efficiency and effectiveness while reducing costs and meeting the diverse needs of farmers.

Technological progress and market application

The development of crop protection drone technology is also accompanied by the continuous expansion of the market. Abroad, Japan developed the world's first crop protection drone in 1987 and currently has over 5000 in stock. Since 2004, China has been researching and promoting unmanned aerial vehicles (UAVs) for crop protection. By 2019, the number of UAVs in operation had reached 55000, covering an area of 33 million hectares. The advancement of policies and technology has also driven the rapid development of crop protection drones in China.

Key technologies and market acceptance

The key technologies of crop protection drones include power systems, flight control, and spraying systems. In the early days, it was mainly oil powered aircraft, but with the rise of electric drones, electric drones gradually became the mainstream in the market due to their cost-effectiveness and environmental friendliness. In terms of market acceptance, farmers have gradually shifted from a wait-and-see attitude to acceptance and recognition, and crop protection drones have become an indispensable tool in agricultural production.

Electromagnetic acoustic transducer testing technology‌ has broad prospects for development in the future, with significant advantages and potential application value. As an emerging non-destructive testing technology, this technology has the characteristics of high precision, no need for coupling agent, non-contact, suitable for high-temperature testing, and easy to excite various ultrasonic waveforms. Therefore, it has received widespread attention and attention in the field of industrial testing. With the advancement of science and technology and the increasing demand for precise monitoring, electromagnetic acoustic transducer testing technology is expected to play a more important role in various fields and further promote the development and progress of human society.

The future development of electromagnetic acoustic transducer testing technology is mainly reflected in the following aspects:

‌High temperature detection capability‌: By configuring high-temperature probes, electromagnetic acoustic transducer testing technology can adapt to high-temperature on-site testing up to 800°C, and automatically compensate for changes in sound velocity to make the thickness measurement more accurate. This feature makes it have great potential in high-temperature industrial applications.

‌Rich application scenarios‌: By adopting electromagnetic acoustic transducers of different configurations, the excitation and reception of various ultrasonic waveforms can be realized, which greatly enriches the application scenarios of electromagnetic acoustic transducer testing technology. This not only improves the detection efficiency, but also enables the technology to adapt to more industrial detection needs.

‌Possibility of online monitoring‌: electromagnetic acoustic transducer testing technology does not require the use of coupling agents, which makes it possible to achieve online monitoring. Online monitoring can monitor the status of industrial equipment in real time, detect potential problems in a timely manner, and thus improve production efficiency and safety‌.

Although electromagnetic acoustic transducer testing technology still has problems such as low transducer conversion efficiency and poor detection effect on coarse-grained materials that need further research and development, these problems will be gradually solved with the continuous advancement and improvement of technology. Overall, the future development prospects of electromagnetic acoustic transducer testing technology are very optimistic, and it will bring more innovations and breakthroughs to the field of industrial testing‌.

‌Electromagnetic acoustic transducer testing technology‌ has broad development prospects in the future and has significant advantages and potential application value. As an emerging non-destructive testing technology, this technology has the characteristics of high precision, no need for coupling agents, non-contact, suitable for high-temperature testing, and easy to excite various ultrasonic waveforms. Therefore, it has received widespread attention and attention in the field of industrial testing. With the advancement of science and technology and the increasing demand for precise monitoring, electromagnetic acoustic transducer testing technology is expected to play a more important role in various fields and further promote the development and progress of human society‌.

The future development of electromagnetic acoustic transducer testing technology is mainly reflected in the following aspects:

‌High temperature detection capability‌: By configuring high temperature probes, electromagnetic acoustic transducer testing technology can adapt to high temperature on-site detection up to 800℃, and by automatically compensating for changes in sound velocity, the thickness measurement value is more accurate. This feature makes it have great potential in high temperature industrial applications‌.

‌Rich application scenarios‌: By adopting electromagnetic acoustic transducer of different configurations, various ultrasonic wave types can be excited and received, which greatly enriches the application scenarios of electromagnetic acoustic transducer testing technology. This not only improves the detection efficiency, but also enables the technology to adapt to more industrial detection needs‌.

‌Possibility of online monitoring‌: electromagnetic acoustic transducer testing technology does not require the use of coupling agents, which makes it possible to achieve online monitoring. Online monitoring can monitor the status of industrial equipment in real time, detect potential problems in time, and thus improve production efficiency and safety‌3.

Although electromagnetic acoustic transducer testing technology still has problems such as low transducer conversion efficiency and poor detection effect on coarse-grained materials that need further research and development, these problems will be gradually solved with the continuous advancement and improvement of technology. Overall, the future development prospects of electromagnetic acoustic transducer testing technology are very optimistic, and it will bring more innovations and breakthroughs to the field of industrial testing.

High voltage transformer is a type of electrical equipment mainly used to convert voltage from the high voltage end to the low voltage end. It is mainly composed of iron core and winding. The iron core is made of highly magnetic conductive material to provide a strong magnetic circuit, while the winding is used to carry current and generate a magnetic field. The following is a brief introduction to the working principle, operation, and maintenance of high-voltage transformers.

1. Working principle:

High voltage transformers work using the principle of electromagnetic induction. When a high-voltage power supply is connected to one side of the winding, current flows through the winding, generating a magnetic field. The magnetic field passes through the iron core and then senses along the winding on the other side. According to Faraday's law, when the magnetic flux changes on the other winding, an induced electromotive force is generated. According to the winding ratio, the induced electromotive force will change the voltage at the output terminal.

2. Running process:

During operation, high-voltage transformers rely on external power sources to provide electrical energy. The voltage of the high-voltage power supply is connected to a high-voltage winding, while the low-voltage winding is connected to the equipment that uses electrical energy. When an external power source is powered on, high voltage current passes through the high voltage winding, forming a magnetic field. The magnetic field passes through the iron core and induces the voltage on the low-voltage winding. In this way, the voltage of the high-voltage power supply will be converted into low-voltage voltage and supplied to the equipment in use.

3. Maintenance:

In order to maintain the normal operation of high-voltage transformers and extend their lifespan, the following points need to be noted:

-Regularly inspect the windings and iron cores for damage, corrosion, or looseness. If there are any problems, they need to be repaired or replaced in a timely manner.

-Check the insulation status of the winding to ensure that the insulation is intact. If insulation damage is found, it must be repaired in a timely manner.

-Clean and maintain the cleanliness of the surrounding environment of the transformer to prevent dust or impurities from entering the transformer and causing malfunctions.

-Regularly inspect and replace the insulation oil inside the transformer to ensure good quality of insulation oil and maintain stable insulation performance.

-Monitor the temperature and humidity of the transformer to ensure they are within the normal range. If the temperature is abnormally high or the humidity is too high, timely measures should be taken to adjust or repair it.

The above brief introduction to the working principle, operation, and maintenance of high-voltage transformers can help understand the basic principles and operating points of high-voltage transformers.

With the rapid development of technology, drones, as a new type of intelligent aircraft, have been widely used in various fields such as aerial photography, agriculture, logistics, and rescue. So, how do drones achieve precise control? This article will provide a detailed answer to this question regarding the control principles, control systems, control methods, and future development trends of unmanned aerial vehicles.

1. Control principle of unmanned aerial vehicles

The control principle of unmanned aerial vehicles is mainly based on aviation mechanics, electronic technology, and control theory. Its core lies in real-time monitoring and adjustment of the attitude, speed, altitude and other parameters of the drone through its internal flight control system, in order to achieve stable flight and precise control.

The drone flight control system usually consists of three parts: sensors, controllers, and actuators. Sensors are responsible for collecting information such as the attitude, speed, and altitude of drones. The controller calculates control instructions based on this information and then drives the drone to perform corresponding actions through actuators such as motors and servos.

2. Control system of unmanned aerial vehicle

The control system of unmanned aerial vehicles is the key to achieving precise control. Generally speaking, the control system of a drone includes two parts: ground control system and onboard control system.

The ground control system mainly consists of remote controllers, ground stations, and other equipment. The remote control communicates with the drone through wireless signals, and the operator can issue control commands through the remote control to control the drone's takeoff, landing, flight trajectory, etc. The ground station is responsible for higher-level task planning, data processing, and real-time monitoring functions.

The onboard control system mainly includes flight control board, sensors, actuators, etc. The flight control board is the "brain" of the drone, responsible for processing information from sensors and calculating control commands. Sensors are responsible for collecting various status information of drones, such as attitude, speed, altitude, etc. The executing mechanism drives the various components of the drone to perform corresponding actions according to the instructions of the flight control board.

3. Control method of unmanned aerial vehicle

There are various control methods for drones, including manual control, automatic control, and hybrid control.

Manual control is the most direct control method, where operators issue commands through a remote control to control the flight of the drone. This method requires operators to have certain flying skills and experience, but can achieve high flexibility and real-time performance.

Automatic control is the use of pre-set programs or algorithms to enable drones to autonomously complete flight tasks. This method does not require manual intervention and can greatly improve the stability and efficiency of flight. For example, in the field of aerial photography, drones can automatically capture images through pre-set routes, greatly reducing the burden on operators.

Hybrid control is a combination of manual control and automatic control, which retains the flexibility of manual control while leveraging the stability advantage of automatic control. In practical applications, operators can flexibly choose control methods based on task requirements and environmental changes.

4. The development trend of drone control technology

With the continuous development of technologies such as artificial intelligence and big data, drone control technology is also constantly advancing. In the future, drone control technology will present the following development trends:

• Intelligence: By introducing artificial intelligence algorithms, unmanned aerial vehicles can achieve autonomous decision-making and intelligent obstacle avoidance functions, improving flight safety and efficiency.
• Clustering: Through drone clustering technology, multiple drones can collaborate to improve task execution efficiency and reduce costs.
• Cloudization: With the help of cloud computing and big data technology, real-time transmission and processing of drone data can be achieved, providing strong support for decision-making.
• Standardization: With the continuous expansion of the drone market, the standardization and normalization of drone control technology will become an inevitable trend, which will help promote the healthy development of the drone industry.

In summary, the control of Agricultural drones involves multiple fields such as aviation mechanics, electronic technology, and control theory, achieving precise control through flight control systems, control systems, and various control methods. With the advancement of technology, drone control technology will continue to develop towards intelligence, clustering, cloud computing, and standardization, providing more efficient, secure, and convenient support for applications in various fields. In the future, drones will play an important role in more fields, bringing more convenience and possibilities to human production and life.

The charging methods of electric vehicles are mainly divided into fast charging and slow charging, which correspond to DC and AC interfaces respectively to meet the needs of different speeds and costs.

Generally speaking, there are usually 5 fast charging interfaces, while slow charging has 2 more, reaching 7 interfaces. Visually, the thickness of the fast charging cable has also become a clear distinguishing feature. For some car models, due to cost control or battery capacity considerations, only one charging mode may be provided, with only one charging port.

In practical operation, fast charging utilizes high current DC or AC technology to charge batteries at lightning speed, but this fast charging method requires more complex station construction facilities and higher cost investment.

In contrast, slow charging uses the vehicle's built-in charging system to charge the battery in a smoother way, which is beneficial for battery life and has lower construction costs. However, it takes a longer time to fully charge, usually 8 to 10 hours.

Understanding these differences can help you make informed decisions when choosing a charging method, whether for daily commuting or long-distance travel, and find the most suitable charging strategy.

A power transformer is an electrical component used to transform voltage, current, or impedance, and is the main equipment for transmitting and distributing electricity in the power system. Its main functions include voltage conversion, impedance conversion, phase conversion, and safety isolation. ‌

Voltage conversion

The most basic purpose of a power transformer is to perform voltage conversion, whether it is boosting or lowering. For example, when transmitting electricity over long distances, transformers can increase the voltage sent out by power plants to reduce losses during the power transmission process; In places where electricity is used, transformers lower the high voltage to supply electrical equipment and users. The ability to convert this voltage makes transformers play a crucial role in the power system. ‌

Impedance transformation

Power transformers also have the function of impedance transformation. Impedance transformation is the process of maximizing signal power transmission by changing the impedance matching at both ends of a circuit. For example, in the output of a television antenna, a balanced 300 Ω television signal is transformed into an unbalanced 75 Ω signal through a transformer to match the input impedance of the high-frequency head. This impedance transformation capability makes signal transmission in circuits more efficient. ‌

Phase transformation

Power transformers can also perform phase transformation by changing the phase of the signal voltage by exchanging the connections of the transformer coils. In certain specific circuit designs, such as push-pull power amplifiers, phase transformation can alternately amplify positive and negative half cycle signals, thereby achieving signal processing and amplification.

Safe isolation

Power transformers also play a role in safety isolation in the power system. When there is an abnormality in the primary or secondary side of the transformer, due to the isolation effect of the transformer, it will not affect the normal power consumption of the other side, thus ensuring electrical safety. ‌

In summary, power transformers play a crucial role in the power system through their functions of voltage transformation, impedance transformation, phase transformation, and safety isolation, ensuring the efficiency, safety, and normal operation of equipment in power transmission. ‌