Advantages and disadvantages of manual and electric friction fastness tester

When purchasing a color fastness tester, you should choose a manual rubbing color fastness tester or an electric rubbing color fastness tester according to the actual

Advantages and disadvantages of manual and electric friction fastness tester

When purchasing a color fastness tester, you should choose a manual rubbing color fastness tester or an electric rubbing color fastness tester according to the actual situation, instead of just looking at the low price to buy. This article introduces manual and electric rubbing color fastness testers. Pros and cons.

Comparison of advantages and disadvantages of manual and electric friction fastness tester

　　1. Price: The manual rubbing color fastness tester has a simple structure and is driven by manpower. If the test is frequent, the labor cost often exceeds the price of the electric rubbing color fastness tester.

　　2. Convenience: The electric friction color fastness tester realizes one-key automatic operation, fast speed, easy to understand, automatic operation and other advantages.

　　3. Accuracy: The electric rubbing fastness tester is controlled by a microcomputer, and each step is precisely controlled. The accuracy of the result is better than the manual rubbing color fastness tester.

　　4. Life: The manual rubbing color fastness tester is prone to misoperation and damage to the device.

　　5. Maintenance: The manual rubbing color fastness tester has a simple structure, so the maintenance is relatively simple.

　　6. ​​Standard: Manual and electric rubbing color fastness testers support the same standards.

　　7. After-sales service: Provide users with timely, thoughtful and complete after-sales service under the principle of non-profit. Respond to failure repairs within 24 hours, 1 year warranty and lifetime maintenance commitment.

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Rubbing" target="_blank" rel="nofollow">[url=https://www.qinsun-lab.com/News-and-events/1345.html]https://www.qinsun-lab.com/News-and-events/1345.html]Rubbing color fastness tester use matters

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Application of vacuum technology
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Metallurgical industry: The vacuum technology used in the metallurgical industry includes molten steel

Application of vacuum technology
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Metallurgical industry: The vacuum technology used in the metallurgical industry includes molten steel vacuum processing, vacuum melting, vacuum induction melting, induction shell melting, vacuum arc remelting, etc. Among them, the vacuum treatment of molten steel is a very important aspect of the metallurgical industry. This technology is mainly used in the atomic energy industry, aerospace technology, ocean drilling technology, gas engine technology, automobile industry, aircraft manufacturing, high-speed trains and other high-tech industries to control and process certain elements in steel, and to The life and reliability of materials put forward higher and higher requirements.
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Electronics and microelectronics industry: Microelectronics technology requires smaller and smaller electronic components and circuits, and higher integration requirements. This is inseparable from the application of vacuum technology, especially the microfabrication technology of VLSI. The formation of geometrical structure, ultra-thin layer growth technology, and particle beam injection technology all require a high-quality and clean vacuum environment, which shows its development Dependence on vacuum technology and equipment.
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vacuum carburizing furnace process characteristics

Vacuum carburizing furnace is an improved gas carburizing process. The carburizing pressure is much lower than atmospheric pressure. The typical pressure range is 300-2500pa. The process features are

vacuum carburizing furnace process characteristics

Vacuum carburizing furnace is an improved gas carburizing process. The carburizing pressure is much lower than atmospheric pressure. The typical pressure range is 300-2500pa. The process features are as follows

(1) The steel surface is kept very clean, because there is no gas interaction, carbon reaches the steel surface faster in vacuum.

(2) Carburizing can be carried out at high temperature, so properly increasing the carburizing temperature can greatly shorten the carburizing time.

(3) Because the control system of low-pressure vacuum carburizing can accurately control the carburizing process, the processed workpiece has good repeatability, small deformation and bright surface, so there is no need to carry out machining after carburizing.

(4) Vacuum carburizing technology has more flexibility, its equipment can be used as independent equipment, or connected with cold working into a production line. The equipment itself can be periodic, suitable for small batch, multi variety production. It can also be a continuous type, which is composed of several heating carburizing chambers, gas quenching chamber, oil quenching chamber, inlet and outlet chamber, vacuum system, workpiece automatic transportation system, etc. it is suitable for mass production. In addition, it is very simple to start and shut down the furnace. It only takes 0.5h for each furnace to start to work.

(5) Vacuum carburizing furnace adopts cold wall vacuum technology, no ignition device, no fire risk, no pollution, clean, safe, simple operation and easy maintenance.

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Development of vacuum furnace

The creation and development of vacuum furnace plays a very important role in human progress. In the Shang Dynasty, a relatively perfect copper smelting furnace appeared in China. The furnace temperature reached 1200 ℃,

Development of vacuum furnace

The creation and development of vacuum furnace plays a very important role in human progress. In the Shang Dynasty, a relatively perfect copper smelting furnace appeared in China. The furnace temperature reached 1200 ℃, and the inner diameter of the furnace reached 0.8m. In the spring and Autumn period and the Warring States period, people further mastered the technology of raising furnace temperature on the basis of copper melting furnace, and thus produced cast iron.

In order to heat large workpieces, the trolley type furnace suitable for heating ingots and billets and the well type furnace for heating long rods have also appeared. Since the 1920s, various mechanized and automatic furnace types have appeared, which can improve furnace productivity and working conditions. With the development of fuel resources and the progress of fuel conversion technology, the fuel of industrial furnace is gradually changed from solid fuels such as lump coal, coke and pulverized coal to gas and liquid fuels such as producer gas, city gas, natural gas, diesel oil and fuel oil, and various combustion devices suitable for the fuel used are developed.

The structure, heating process, temperature control and atmosphere of vacuum furnace will directly affect the quality of processed products. In the forging furnace, increasing the heating temperature of the metal can reduce the deformation resistance, but too high temperature will cause grain growth, oxidation or overburning, which will seriously affect the quality of the workpiece. In the process of heat treatment, if the steel is heated to a certain point above the critical temperature and then cooled suddenly, the hardness and strength of the steel can be improved; if the steel is heated to a certain point below the critical temperature and cooled slowly, the hardness of the steel can be reduced and the toughness can be improved.

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Principle of vacuum brazing furnace

There are two types of brazing furnace, vacuum and non vacuum. Here we mainly explain the vacuum brazing furnace. Understanding its principle will also help us to understand its use methods and precautions.

Vacuum

Principle of vacuum brazing furnace

There are two types of brazing furnace, vacuum and non vacuum. Here we mainly explain the vacuum brazing furnace. Understanding its principle will also help us to understand its use methods and precautions.

Vacuum furnace brazing is of high quality and expensive equipment. The conventional process is to apply flux to the parts to be cleaned and decontaminated, spread solder (powder, granular and flake) and put another part to be welded (the welding surface is also coated with flux). After positioning and fixing the two parts, put them into the furnace and heat them up to the temperature of solder melting to complete the welding. It uses the furnace temperature to raise the temperature of the workpiece, and melts the solder whose melting temperature is lower than the workpiece, so that the workpiece can be welded. Among them, the choice of solder is very important, this process has high yield, good quality and small deformation. Suitable for mass production.

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Application and applicable temperature of high temperature pump

The flow passage parts of high temperature pump are made of stainless steel (304, 316L), which are widely used in petroleum, chemical, pharmaceutical, electroplating, environmental

Application and applicable temperature of high temperature pump

The flow passage parts of high temperature pump are made of stainless steel (304, 316L), which are widely used in petroleum, chemical, pharmaceutical, electroplating, environmental protection, water treatment, national defense and other departments. It is an ideal equipment for conveying flammable, explosive, toxic and precious liquids, and the best choice for creating a leak-free and pollution-free culture workshop.

The normal applicable temperature of the high-temperature pump is less than 100 degrees. If high-temperature medium needs to be transported, it can be customized as high-temperature type, and the applicable temperature can be within 200 degrees. It can also be customized with insulation jacket to keep the high-temperature medium transported.

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Requirements of vacuum pump for lubricating oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing mode, clearance of accessories, material quality and so on. This paper mainly explains the requirements of

Requirements of vacuum pump for lubricating oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing mode, clearance of accessories, material quality and so on. This paper mainly explains the requirements of vacuum pump for lubricating oil.

(1) With appropriate viscosity: the viscosity of oil is too small, the lubricity can not meet the requirements, the sealing is not good, the viscosity is too high, the internal friction is large, the rotor rotation is difficult, the kinetic energy consumption is increased, and the oil temperature is also increased. The increase of oil temperature will accelerate the oxidation deterioration of oil, especially for rotary vane vacuum pump.

(2) Low saturated vapor pressure: the "vapor pressure" index of oil is low, so it is not easy to evaporate under the working conditions of low pressure and high temperature in the vacuum pump, so as to ensure the required vacuum degree.

(3) The oxidation stability is good, and the oil in use is not easy to oxidize and deteriorate.

Generally, vacuum pump oil is selected for vacuum pump. At present, there is only No. 1 vacuum pump oil made in China. It is made of natural crude oil and refined deeply. It plays the role of lubrication and sealing in vacuum pump.

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Installation and use of rotary oil pump

When installing the rotary pump, certain rules must be observed: the pump with small displacement (moving plate and fixed piece type) should be fixed on a considerable base, and when installing the pump, it

Installation and use of rotary oil pump

When installing the rotary pump, certain rules must be observed: the pump with small displacement (moving plate and fixed piece type) should be fixed on a considerable base, and when installing the pump, it should be considered that the use process is easy to access, so as to observe its working conditions and replace new oil.

Piston pump should be installed on the foundation and fixed with bolts, nuts, washers and lock nuts. After installation, the pump must be cleaned with clean cloth.

Before starting the pump, it must be washed with vacuum oil, and then injected with the required amount of pumping. When the pump motor and circuit connected, must be sure that the motor belt rotation direction is correct.

To do this, the drive belt must be removed from the pulley of the pump, and then the motor is switched on. If the rotation direction of the motor pulley is consistent with the direction indicated by the pointer on the pump cover, it is correct to turn on the motor (if it is standing against the motor, its pulley should rotate clockwise).

After the motor stops rotating, put on the drive belt, tighten it with the fastening bolt on the sliding plate, and finally fix the motor firmly (at this time, the intake pipe of the pump should be sealed).

After that, the pulley of the pump must be rotated by hand for several turns, and then the pump is turned on, and the limit empty caused by the pump is measured. In order to prevent the oil from splashing out of the pump, do not switch on the pump at once, but turn on the motor intermittently several times in a short time interval, and the rotation of the pump rotor is not greater than half revolution in each time interval.

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Micro air pump

The essence of vacuum adsorption of micro vacuum pump: after the micro vacuum pump is powered on, the pressure difference between the negative pressure generated at the suction port and the external atmospheric pressure is used to firmly

Micro air pump

The essence of vacuum adsorption of micro vacuum pump: after the micro vacuum pump is powered on, the pressure difference between the negative pressure generated at the suction port and the external atmospheric pressure is used to firmly absorb the object through the contact elements such as suction cup, so as to play the role of hanging, fixing and moving objects.

The next process of vacuum adsorption is the release of the object after being absorbed. When it is necessary to release the absorbed object, the pump must be shut down first, and do not continue to vacuum. After the pump is shut down, the object may not fall off immediately, because the pump has a certain pressure holding capacity, and the vacuum will continue to maintain for a certain period of time (the length of time depends on the air leakage of the system).

However, the actual situation is that the current dual-purpose micro air pump, micro vacuum pump and so on, including domestic micro air pump, micro vacuum pump and most of foreign micro air pump and micro vacuum pump, because of the internal process principle and other reasons, only allow gas to flow from the air inlet to the exhaust port in one direction, and vice versa. It is not simple to reverse the motor can change the direction of the air flow, to meet the requirements of the release object.

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Fault stop of coal slime pump
Failover refers to that during the normal startup and operation of the slime pump delivery system, the system will automatically enter the failover state in case of any abnormal state of the equipment. At the same time, the

Fault stop of coal slime pump
Failover refers to that during the normal startup and operation of the slime pump delivery system, the system will automatically enter the failover state in case of any abnormal state of the equipment. At the same time, the sound-light alarm of the system will be started and the LED will indicate "failure". The staff shall overhaul the abnormal equipment. After completion, start the self-test program of the faulty equipment to check whether the fault is eliminated. When the fault is eliminated, the operation button opens the lock and the LED displays "Everything is normal".
Fault shutdown of coal slime pump delivery system mainly includes:
1. The vacuum pressure gauge is over the limit
When the pressure of the vacuum pressure gauge is too high (> 0.04mpa) due to blockage of the oil absorbing filter element, the operating table shall display the word "oil absorbing blockage", and the filter element shall be cleaned or replaced.
2. Proximity switch fails and stops
When the proximity switch is damaged, the display is normally on, equivalent to two proximity switches contacting induction rings at the same time. The same phenomenon occurs when the proximity switch connection is broken. Just replace or rewire.
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