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What should you pay attention to when choosing a vacuum drying oven?

September 21, 2018 by lanphan  

What should you pay attention to when choosing a vacuum drying oven?

1. Can the thermometer reading in the vacuum oven represent the actual temperature of the vacuum chamber space?

2. The meter reading of the electric vacuum drying oven is very different from the reading of the glass rod thermometer in the vacuum chamber. Why is this?

3. Why is there no temperature uniformity parameter for the electric vacuum drying oven?

4. How to control the heating temperature under vacuum in the electric vacuum drying oven?

5. Why should the electric vacuum drying oven be vacuumed and then heated?

Precautions for purchasing a drying oven

September 21, 2018 by lanphan  

Precautions for purchasing a drying oven

1. Physical change characteristics of materials - morphology, water content, water content, water of crystallization, particle size, bulk density, viscosity, heat sensitivity, softening point, phase transition point, thixotropy, toxicity, corrosiveness, odor, flammability, explosive Sex, electrostatic, gas permeability, agglomeration, susceptibility to crystals or particles

2. Drying properties of the material - drying curve, critical and equilibrium moisture content under the selected drying conditions.

3. Dry production requirements and long-term planning.

4. The impact of material commodity value and drying effect on it. Such as product moisture, pollution, temperature, wear, crushing, rehydration, etc. on the value of the commodity.

5. Requirements for material recovery rate.

6. The upper and lower sequence process of the material drying process.

7. Drying method of material in the past or drying method of similar products.

Working principle and structure of electric blast drying oven

September 21, 2018 by lanphan  

Working principle and structure of electric blast drying oven Part of the electric heating constant temperature blast drying box is composed of a box body, an electric heater, a temperature controller, a fan, a wind convection circulating air duct, an air inlet duct, an air outlet duct and an air outlet size adjusting device. The electric heating constant temperature air drying oven is heated by an electric heater. Generally, the heating wire exposed in the air is easily oxidized due to high temperature and long-term heating, which affects the life. The Lihui brand dry box heater usually adopts a coil type electric heating tube, that is, a heating wire. Located inside the heating tube, it can reduce the oxidation rate and increase the life, while the heat is transferred to the steel tube to increase the heat transfer area. The drying oven temperature controller is used to control and display the temperature. When the temperature inside the box is lower than the set temperature, the temperature controller controls the heater to continuously heat or the gap heats, so that the temperature inside the box reaches a controllable purpose. The function of the blower fan is to convect the air level in the dry box (desktop electric blast drying oven) or vertical (vertical blast drying oven), so that the air in the box is blown onto the electric heater and heated to the studio. Then, the fan is sucked into the fan by the working chamber and then blown to the electric heating tube for heating, and the temperature in the box is more uniform while continuously circulating and heating.

Electric heating constant temperature air drying oven use and precautions

September 21, 2018 by lanphan  

Electric heating constant temperature air drying oven use and precautions

1. After connecting the power supply, you can turn on the 2 sets of heating switches, and then set the temperature of the control instrument to the temperature you need. The indicator light is on and the blower switch can be turned on to make the blower work.

2. When the temperature rises to the desired temperature, the indicator light is off. At the beginning of the constant temperature, the temperature may continue to rise. This is the effect of residual heat, which will tend to stabilize in about half an hour. In the constant temperature process, the temperature control is automatically controlled by the thermostat in the box without manual management.

3. When the temperature is constant, a set of heating switches can be turned off, leaving only one set of electric heaters to work, so as to avoid excessive power and affect the sensitivity of the constant temperature.

4. The box should be placed indoors.

5. A blade switch of the iron casing shall be installed in the power supply line for the purpose of this box and the casing shall be grounded.

6. Please check the electrical performance of the box before power-on, and pay attention to whether there is an open circuit or leakage.

7. When everything is ready, put the test sample, close the door and unscrew the top exhaust valve. At this point, you can connect the power supply and start working.

8. Do not arbitrarily remove the side door, disturb or change the line. Only when the box fails, the side door can be removed and checked one by one. If there is a major fault, you can contact the factory.

9. This box is a non-explosion-proof drying box, so it has flammable volatiles. Do not put it in a dry box to avoid explosion.

10. Two drying shelves are attached to each drying box. The average load per shelf is 15 kg. Do not over-tighten and overload the test specimens to avoid affecting hot air convection. At the same time, the test piece should not be placed on the heat sink at the bottom of the studio to prevent overheating.

Self-introduction of laboratory drying oven

September 21, 2018 by lanphan  

Self-introduction of laboratory drying oven

Industrial ovens range in temperature from room temperature to 300 degrees and can be arbitrarily selected for permanent temperature control.

The constant temperature oven is equipped with a circulating fan to make the hot air mechanically convect and the temperature is more uniform.

Precision ovens are precision-engineered, well-made and easy to operate.

The box body is machined by CNC machine tool, which is beautiful in appearance and durable.

Double glazed windows with high temperature resistant silicone for easy viewing and reduced heat loss

What are the precautions for using the drying oven and the precautions for use?

September 21, 2018 by lanphan  

The vacuum drying oven is specially designed for drying heat sensitive, easily decomposable and easily oxidizable substances. It can keep the working chamber with a certain degree of vacuum during operation, and can be filled with inert gas inside, especially for some complex materials. Quick drying. It is widely used in research and application fields of biochemistry, chemical pharmacy, medical and health, agricultural research, environmental protection, etc., for powder drying, baking and disinfection and sterilization of various glass containers. It is especially suitable for fast and efficient drying of heat sensitive, easily decomposable, oxidizable substances and complex ingredients. What are the precautions for using the drying oven and the precautions for use?

How to change the temperature uniformity of the blast drying oven

September 21, 2018 by lanphan  

Electric blast drying oven is a commonly used equipment, mainly used to dry samples, and can also provide the temperature environment required for experiments. Electric blast drying oven application and chemical, electronics, casting, automotive, food, machinery and other industries Generally divided into galvanized steel and stainless steel liner, pointer and digital display, natural convection and blast circulation, conventional oven and vacuum, most of the temperature is below 300 degrees, and its technical indicators are better. More and more drying ovens are available at 400 degrees. How to change the temperature uniformity of the blast drying oven

Drying oven maintenance details

September 21, 2018 by lanphan  

Vacuum drying ovens are often used in the test process, such as the stopper can not be opened, the dirt on the instrument is difficult to remove, and emulsification occurs during liquid separation. To sum up a few tips for solving such problems for your reference:

Drying oven maintenance details

One: crystallization on the beaker wall

When the solution is refluxed or concentrated, crystals are often deposited on the inner wall of the flask above the liquid surface, and the adhesion is firm, and not only cannot participate in the reaction, but also gradually discolors due to poor heat. In this case, the flask can be gently shaken, and the internal solution is impregnated with crystals to dissolve. If the flow of the apparatus is limited and the flask cannot be shaken, a cold wet cloth may be applied to the upper portion of the flask to dissolve the precipitated crystals when the solvent condenses down the wall.

Vacuum drying oven In addition, it is necessary to quickly dry the instrument and remove special dirt on the instrument regularly or in time.

When a special stain is adhered to a glass instrument and it is difficult to remove it by a general washing method, the nature of the soil should be distinguished first and then treated in a targeted manner. It is urgent to use a dry instrument, and when it is too late to dry by conventional methods, it can be washed with a small amount of absolute ethanol.

Two: the glass instrument interface can not be opened because it is stuck

When the screw cap is not open, you can use a hair dryer or a small flame to bake the vicinity of the cap to expand it, and then use it to wrap the cap and unscrew it.

Tap on the side of the grounding part with a small piece of wood to make it loose and loose. For the fixed reagent bottle, the grinding plug of the separatory funnel, etc., the plug and the bottle mouth of the instrument can be stuck at the corner of the test bench or the wooden table, and then the wood is lightly inclined at an angle of about 70° to the axis of the instrument. Small buckles, while rotating the instrument intermittently, such as repeated manipulations for a few times, generally can open the crack is not severe.

Three: the thermometer is glued by a rubber stopper

The vacuum drying box can be inserted into the thermometer or the glass tube and the rubber plug or the hose with the tip of the small screwdriver or the knife to make it vacant, and then drop a few drops of water, such as manipulation and expansion along the thermometer or glass tube. Gradually deepen, it will soon be released. You can also use a drill that just fits into the thermometer or glass tube, put a little glycerin or water on it, put it in from one end of the thermometer, gently push it while pushing it. When it is difficult to roll, pull out the lubricant. Inherited rotation, after repeated several times, you can pry out the thermometer or glass tube.

Precautions for Using a Rotary Evaporator

August 10, 2018 by lanphan  

The science equipment manufacturer publishes an article on precautions for using a rotary evaporator to efficiently distill solvents. According to the spokesperson of the company, the information will allow laboratories to use the apparatus with efficiency to achieve great results. The article will also detail out the correct way to halt the apparatus. The spokesperson reveals that one should, at first, must learn about the equipment itself. It consists of four parts, which are water or oil bath, rotary rotor, a glass condenser and flasks. The article reveals simple steps of using and halting the apparatus, which are easy to learn and practice in laboratories. 

stainless steel exhaust bellows

August 3, 2018 by lanphan  

stainless steel exhaust bellows often be used for the exhaust systems of trucks, forestry, marine, power generation, buses, tractors, construction and military. The stainless steel exhaust bellows is an vital connecting piece in exhaust piping system, it uses hydraulic pressure forming technology to maintain a good gas tightness. The flexible exhaust bellows is applicable for the discharge of all kinds of gases, reduce the engine pollution to the lowest point.


The flexible exhaust bellows is always made from stainless steel, which is a high temperature and corrosion resistant metal material welcomed by most pipe expansion joints. Our stainless steel exhaust bellows could be braided with steel wire outside the bellows to prompt strength and pressure.

Lanphan flexible exhaust bellows are various in types and dimension, we can produce the bellows from DN25mm to DN200mm, flange and braiding could be custom-made according to customer requirements. Lanphan flexible exhaust bellows are in good flexibility and gas tightness, product length is unconstrained. It is mainly used for the piping exhaust system to absorb vibration and reduce noise, also convenient for installation and lengthen piping service life.