Rotary vane vacuum pumps are widely used in cleaning systems. This type of vacuum pump is well suited for this type of application and is therefore the standard pump in the drying process of the cleaning system. The rotary vane vacuum pump has a long service life and a powerful vacuum generator with a high vacuum level. However, when it comes to a cleaning process with a high probability of steam generation, the rotary vane vacuum pump does not always prevent condensation from occurring during the suction removal of the vacuum pump. At the same time, the condensate is emulsified by vacuum pump oil. This may result in insufficient lubrication of the rolling bearings and rotating blades, resulting in wear of the vacuum pump components, and suction performance and expected vacuum may also be affected. These effects can be maintained by increasing the vacuum pump oil and filters more frequently and the overall operating cost increases.
Look at the manufacturer to explain for you: the cooling principle of quenching oil!
The quenching oil heats the metal material above the phase transition temperature, and after being kept for a period of time, it is quickly put into the medium to be cooled to obtain a martensite structure. This operation process is called quenching. The cooling of the steel in the medium is carried out in three different ways.
1. Vapor film stage. The cooling rate at this stage is very low. As the cooling time is extended, the temperature of the part is continuously decreased, and the stability of the vapor film is gradually lowered, and then the vapor film is broken and enters the boiling stage.
2. The boiling stage. When the vapor film breaks and disappears, the quenching medium is brought into direct contact with the surface of the part, and the quenching medium draws a large amount of heat from the part. The flow of the quenching medium is hindered, and the medium that absorbs heat continuously escapes a large number of bubbles, and the new medium continues to boil vigorously around the parts to form a boiling stage, at which time the cooling rate is large. As the temperature of the parts continues to drop, the boiling phenomenon gradually disappears. When the temperature of the part is lower than the boiling point of the quenching medium, the boiling phenomenon disappears immediately and then the convection heat transfer stage is transferred.
3. Convective heat transfer stage. When the part is in the boiling stage, the temperature of the surrounding quenching medium is close to the temperature of the part, and the temperature of the medium away from the part is lower. Since the quenching medium around the part is different from the temperature of the medium in other places, the quenching medium is convective.
The above is the quenching oil manufacturer’s cooling principle for quenching oil.
Can alloy products be vacuum plated
Summary of reasons why alloys are not suitable for vacuum plating in vacuum furnaces:
1. Because the alloy object is not resistant to high temperature (usually the temperature in the vacuum furnace is as high as 200 ° C), the alloy vacuum plating starts to foam after 110 ° C; affecting the appearance of the product;
2. When the alloy object is vacuum-coated, the bottom layer needs to be hit in the early stage, which invisibly increases the complexity of the process;
3. Compared with stainless steel, titanium steel or other pure metal plating parts, the cost of vacuum plating of alloy objects is relatively high;
Tips for hinge mounting methods
1, preparation tools
Prepare special installation tools before installation, such as tape measure/level ruler for measurement, woodworking pencil for drawing line, wood hole opener/pistol drill for opening, fixed screwdriver, etc.
2, draw line positioning
First, use the installation measuring board or woodworking pencil to draw the line (the drilling margin is usually 5 mm), and then use a pistol drill or a woodworking hole opener to make a 35 mm hinge cup mounting hole on the door panel. The drilling depth is generally 12 mm. ;
3, fixed hinge cup (hinge products)
Fix the hinge cup with the self-tapping screws in the hinge cup hole on the starter panel of the hinge sleeve;
4, fixed base
After the hinge is embedded in the cup hole of the door panel, the hinge is opened, then the side plate is inserted and aligned, and the base is fixed by a self-tapping screw;
5, debugging effect
The last step is to open the door to test the effect.
The general hinges can be adjusted in six directions, aligned up and down, and the two doors are moderately right and left. The best effect of the cabinet door debugging is better. The clearance after closing the door is generally 2 mm.
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Installation method of bathroom partition door
1, the bathroom partition door to buy a good quality shower room partition material. The plate is the basis of the shower partition. Try to use waterproof, moisture-proof, anti-collision and impact-resistant partition materials, so that the shower partition is safer. The key factor of the shower partition is the accessories. In the shower partition, the requirements for the accessories are wear-resistant and sturdy.
2. When measuring the relationship between the size of the shower partition and the size of the bathroom during construction, it must be controlled so as not to be unsuitable in size when installing. Then first install the sealing strip. The shower partition door is placed in a damp bathroom. To prevent mold and other conditions, the shower door should be installed with a sealing strip before the aluminum strip is placed on the side. The sealing strip has the functions of sealing, mildewproof and silent.
3. Connect the frame. Once the seal is installed, the glass is embedded in the aluminum strip. The role of the aluminum strip is to protect the glass. Second, the aluminum strip is required to be used as a frame, and then fixed to the wall by a frame connection. After the aluminum strip is buckled, the aluminum strip and the glass, the aluminum strip and the aluminum strip are fixed by screws to form a frame. Mounting screws is a critical step in the assembly process. First of all, this is a meticulous work, the screws are relatively small, and it is difficult to install. Second, the screws need to be tightened to ensure that the attached frame does not fall apart.
4. At the contact between the mullion and the wall, the bottom rail and the stone base, the stone base and the ground contact, and the glass seal is sealed. The horizontal gap between the stone base and the ground is too large, and the white cement is leakproof. At the contact between the mullion and the wall, the bottom rail is in contact with the stone base, and the stone base is in contact with the ground. If the gap between the stone base and the ground is too large, it should be treated with paste white cement for leak prevention.
Bathroom waterproofing tips, do you know
First, the brand must be recognized when purchasing: At present, there is a flood of goods in the market, and toxic materials that have been eliminated or banned by the state have also flooded into the homes. Ordinary consumers should choose brand products with high reputation, good reputation, high degree of anti-counterfeiting and international quality system certification.
Second, the waterproof parts should be comprehensive: the floor and wall of the bathroom (return height is not less than 1.8 meters or full), the floor and wall of the kitchen, balcony (return height is not less than 0.3 meters), all of the first floor residential Floor and wall (return height 0.3 m), the ground floor and all walls of the basement should be waterproof and moisture-proof.
Third, the thickness of the waterproof layer should be enough: the thickness of the waterproof layer directly affects its waterproof life. If the thickness of the waterproof layer is reduced, it is equivalent to reducing its waterproof life. cnc machining
Fourth, the construction process should be meticulous: the joint between the wall and the ground, the yin and yang angle, the water pipe, the floor drain and the surrounding of the sanitary ware and the trench in the laying of the cold and heat pipe are the key waterproof parts, and the construction must be meticulous.
5. Closed water test after completion: After the waterproof construction is completed, seal the door and the drain, and store the water for 24 hours indoors to check if there is any leak.
6. If leakage is found, even if remedial measures are implemented.
CNC machine maintenance methods
The main contents of daily maintenance of CNC CNC machine tools: the daily maintenance of CNC machine tools requires maintenance personnel not only to have mechanical, processing technology and hydraulic knowledge, but also to have computer, automatic control, drive and measurement technology knowledge, so as to fully understand and master the CNC lathe, do a good job in time. Maintenance work.
The main maintenance works are as follows:
(1) choose the right environment for use. The operating environment of NC lathe (such as temperature, humidity, vibration, power supply voltage, frequency and interference) will affect the normal operation of the machine tool, so the installation of the machine tool should strictly comply with the installation conditions and requirements specified in the machine tool instructions. If economic conditions permit, the NC lathe should be installed in isolation from ordinary machining equipment for easy maintenance and maintenance.
(2) CNC lathe should be equipped with specialized personnel in NC system programming, operation and maintenance. These personnel should be familiar with the machine tools used in the mechanical, numerical control system, electrical equipment, hydraulic, pneumatic and other parts of the characteristics of the working environment, processing conditions, and can be in accordance with the machine tools and system instructions for the correct use of CNC lathes.
(3) timely cleaning. Such as air filter, electrical cabinet cleaning, printed circuit board cleaning.
(4) Machine tool cable inspection, mainly to check the cable moving connector, bend out of contact, broken wire and short circuit and other faults.
(5) In some CNC systems, CMOS components are used to store the parameters, which are maintained by battery power when power is cut off. When a low voltage alarm occurs, the battery must be replaced in time, and must be carried out in the state of power on the control system, otherwise the storage parameters will be lost, resulting in the NC system can not work.
(6) maintenance of CNC lathe is not necessary for a long time. When the NC lathe is idle, it should be energized to the NC system frequently and run empty when the lathe is locked. In the Meiyu season when the air humidity is high, it should be energized every day, and the humidity in the numerical control cabinet should be driven away by the heating of the electrical components themselves to ensure the stability and reliability of the electronic components.
Attention should be paid to leakage protector when used
Speaking of leakage protector should be familiar to everyone, but asked about the principle of leakage protector is not very clear, in fact, the principle of leakage protector is not complicated, is the use of overload or short-circuit power at home when the protection device, remind everyone to check the current power consumption and stop unsafe behavior of the relay Continue. Now there will be leakage protectors in the home, because more and more household appliances are used, and the use of electricity is a certain danger, we need to leakage protectors to protect us to a certain extent, then what is the principle of leakage protectors, in the use of what should be noted.
1. What is leakage protector?
Leakage protector, referred to as leakage switch, also known as leakage circuit breaker, is mainly used in equipment leakage fault and fatal personal contact protection, overload and short circuit protection functions, can be used to protect the line or motor overload and short circuit, but also under normal circumstances as a line of infrequent switching. Switch to boot.
Two. Principle of leakage protector:
The leakage protector mainly consists of three parts: the detection element, the intermediate amplification link and the operation execution mechanism. Its working principle is:
The leakage protector is installed in the line, and the primary coil is connected with the line of the grid, and the secondary coil is connected with the tripper of the leakage protector.
When the electrical equipment is in normal operation, the current in the circuit is in balance state, and the sum of the current vectors in the transformer is zero (the current is a directional vector, such as “+” in the direction of outflow and “-“, and the current in the transformer is equal in magnitude, opposite in direction, and the positive and negative are offset each other). Since there is no residual current in the primary coil, the secondary coil will not be induced, and the switching device of the leakage protector is in a closed state.
When a leakage occurs in the shell of the equipment and someone touches it in time, a shunt will occur at the fault point. The leakage current will return to the neutral point of the transformer (not through the current transformer) through the human body-earth-work grounding, resulting in the imbalance of the current (the sum of the current vectors is not zero), and a coil will be left. Residual current. Therefore, the secondary coil will be induced, when this current value reaches the limit of the leakage protector action current value, automatic switch tripping, cut off the power supply.
Three. Points for attention in leakage protector:
1. Leakage protector is suitable for low-voltage distribution system where neutral point of power supply is directly grounded or grounded by resistance or reactance. For power source neutral grounding system, leakage protector is not suitable. Because the latter can not constitute a leakage electrical circuit, even if a grounding fault occurs, resulting in greater than or equal to the rated action current of the leakage protector, the protector can not act in time to cut off the power supply circuit; or rely on the human body to connect the fault point to constitute a leakage electrical circuit, to promote the leakage protector action, cut off the power supply back. The road. But this is not safe for the human body. Obviously, it is necessary to have the condition of grounding device. When the leakage current of electrical equipment occurs, and when the leakage current reaches the action current, it can immediately trip within 0.1 seconds, cutting off the main circuit of power supply.
2. The neutral line N of the leakage protector to protect the line must pass through the zero sequence current transformer. Otherwise, when it is connected, there will be an unbalanced current which makes the leakage protector malfunction.
3, zero protection line (PE) is not allowed to pass zero sequence current transformer. When the protection line (PE) passes through the zero-sequence current transformer, the leakage current passes through the PE protection line and then passes back through the zero-sequence current transformer, resulting in the current cancellation, and the leakage current value can not be detected on the transformer. When a fault occurs, the leakage protector will not act and will not protect.
4. The working neutral line of the control loop can not be repeatedly grounded. On the one hand, when grounded repeatedly, part of the working current will return to the neutral point of the power supply through repeated grounding under normal working conditions, and unbalanced current will appear in the current transformer. When the unbalanced current reaches a certain value, the leakage protector will produce misoperation; on the other hand, the leakage current on the protection line may pass through the individual line of the current transformer and return to the neutral point of the power supply, which cancels the leakage current of the transformer and makes the protector refuse to operate.
5. The neutral line N and the protective line (PE) behind the leakage protector can not be integrated into one. If the two are combined together, when leakage fault or electric shock occurs, the leakage current flows back through the current transformer, and the result is similar to case 3, causing the leakage protector to refuse to operate.
6, the lines between the protected electrical equipment and the leakage protector can not touch each other. If there is a line collision or zero-line intersection, it will immediately destroy the zero-sequence balanced current value, resulting in leakage protector maloperation; in addition, the protected electrical equipment can only be installed in parallel after the leakage protector, the connection is guaranteed to be correct, and the electrical equipment is not allowed to connect to the connection of the test button.
What is the principle of leakage protector, I believe that we all know now, leakage protector can be in the event of leakage fault automatically tripped off power, our safety has a great protective effect, so we must not be less in the home decoration leakage protector installation and use.
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