1) welding facilities must be equipped with fire protection equipment, such as sand box, fire extinguisher, fire hydrant and bucket. The flammable goods should not be less than 5m in the welding place. If the distance can not be met, the asbestos board and asbestos cloth can be properly covered to prevent Mars from falling into flammable goods. The explosive material must not be less than 10m. Argon arc welding workplaces should have good natural ventilation and fixed mechanical ventilation devices to reduce the harm of argon arc welding harmful gas and metal dust.
2) manual tungsten inert gas welder should be placed in dry and ventilated place and strictly operated according to the instruction manual. The welding machine should be inspected thoroughly before use. Make sure there are no hidden dangers, and then connect the power. The welding can be applied after the normal operation is normal. To ensure that the welding machine is properly connected, it must be well and firmly grounded to ensure safety. The power supply of the welding machine is controlled by the switch on the power board, and the load switch is strictly prohibited to avoid burning the shape contacts.
3) check the working condition of the cooling water system of the argon arc welding gun regularly, and find that the blockage or leakage should be solved immediately, so as to prevent the burning gun from burning and affect the welding quality.
4) when the welding personnel leave the workplace or the welder is not used, the power must be cut off. If the welder is out of order, it should be repaired by professional personnel. Safety measures such as electric shock should be well protected during maintenance. The welding machine should be cleaned and cleaned at least once a year.
5) the high frequency electromagnetic field produced by the high frequency oscillator of TIG welder can cause dizziness and fatigue. Therefore, the time of high frequency electromagnetic field should be minimized during welding, and the high frequency power will be cut off immediately after igniting the arc. A soft metal braided wire shield is applied outside the welding torch and welding cable (one end of the hose is connected to the welding torch, the other end is grounded, and the outside is not insulated). If conditions permit, the crystal pulse arc should be used as far as possible to replace the high frequency starting arc.
6) when the argon arc welding is applied, the intensity of ultraviolet ray is very strong. It is easy to cause electro ophthalmia and arc burn, and produce ozone and nitrogen oxides to stimulate the respiratory tract. Therefore, welders should wear white canvas work clothes, wear masks, face masks and protective gloves, foot covers and so on. In order to prevent electric shock, the insulating rubber should be covered on the ground near the work table, and the staff should wear insulating rubber shoes.
safety protection
(1) ventilation measures should be well ventilated at the working site of argon arc welding, so as to discharge harmful gases and soot. In addition to ventilation in factory buildings, several axial fans are installed in the place where the welder is concentrated and the welding workload is large.
In addition, local ventilation measures can be used to remove harmful gases around the arc, such as open arc smoke hood, smoke exhaust welding torch and portable small fan.
(2) as far as protective radiation is concerned, the cerium tungsten electrode with extremely low radiation dose is used as far as possible. When the thorium and cerium tungsten pole are processed, they should be grinded with sealed or pumped grinding wheels. The operator should wear personal protective products such as masks and gloves. After processing, the hands should be cleaned. The thorium and cerium tungsten poles should be stored in the aluminum box.
(3) measures to protect high frequency
In order to prevent and weaken the effects of high-frequency electromagnetic fields, the measures adopted are:
1) the workpiece is well grounded, and the welding cables and ground wires should be shielded with metal braided wires.
2) to reduce the frequency properly;
3) try not to use high frequency oscillator as an arc stabilizer to reduce the time of high frequency electrical action.
(4) other personal protection measures
During argon arc welding, due to strong ozone and ultraviolet radiation, it is advisable to wear non cotton work clothes (such as acid resistant, tussah silk, etc.). Personal ventilation measures such as air supply helmet, air mask or respirator can be used when welding inside the container and not using partial ventilation.
Safety regulations and safety protection of longitudinal welder for argon arc welding
Precautions for the installation and operation of the shot blasting machine
Matters needing attention in the installation process of shot blasting cleaning machine:
1. The main position of the shot blasting machine is: when the main engine is in position, its level and weight must meet the requirements of the drawing.
2. The installation of parts should be carried out from the bottom to the highest.
3, track type or catenary type, roller type should be caused by peripherals.
4. Part of the preliminary test should be done first, and then run normally after normal commissioning.
Attentions of operators in the operation of equipment:
1, we must pay attention to whether the display of its cabinet is normal.
2, all personnel entering the shot blasting room must wear eye glasses and helmets.
3, the operator must check the equipment every day.
These include lubrication and mechanical parts. Lubrication parts such as reducer, hydraulic pressure, mist sprayer and bearing chain. Mechanical parts such as wear of rotating parts and wear of worn parts.
Example: if the shot blasting machine has vibration, it must stop the machine immediately to replace the blade; register the wear condition every day, and change the wearing parts in time.
4, the lubrication part should ensure timely refueling.
5, the directional sleeve must be adjusted and replaced in time.
6. Check the quantity of steel balls every day.
Classification of air floatation machine
Cavitation air floatation machine
The cavitation air flotation machine mainly rotates the aeration impeller at high speed through the OLTE cavitation aeration head, so that the gas can disperse quickly in the liquid, and the air flotation effect has been achieved. The rotating impeller at high speed rotates at a speed of 2900 revolving per minute. And the gas from the impeller into the liquid can not quickly spread, the second blades cut it into two bubbles, repeated high speed rotating cutting, finally to achieve small bubbles, resulting in air floatation. For example, the products of Dalian three phase mechanical equipment development Co., Ltd. can reach 20-50 micron diameter bubbles.
OLTE gas floatation machine
OLTE dissolved air floatation machine is mainly through dissolved gas and supersaturated dissolution, and finally released in the flotation tank to achieve air flotation effect.
Dispersing air floater
The dispersing air flotation machine is mainly through dispersing the air bubble to achieve the air flotation effect.
Super efficiency shallow air floatation machine
Super efficiency shallow air floatation device is an advanced air floating system. It has successfully applied the principle of “shallow pool theory” and “zero speed”. It integrates coagulation, air floatation, slag skimming, precipitation and scraping. It is a kind of high efficiency and energy-saving water purification equipment.CQJ super efficiency shallow layer ion flotation is flocculation, air floatation, skimming and scraping mud. The air floatation device of the body is designed with the “shallow pool theory” and “zero speed principle”. The residence time is only 3-5 minutes, and the water is static. The adhesion of the micro bubbles and the floc occurs in the whole process of air flotation, including the contact area, the dross is discharged instantaneously, and the water suspended in the water is low. The removal rate of suspended solids can reach more than 90% – 99.5%. The removal rate of COD can reach 65% – 90%, and the removal rate of chromaticity can reach 70% – 95%.
Do big things, you have to be with a great man
There are 4 big chicken shops in the downstairs snack street of the company. The best thing to eat is Wang Ji. I am a vegetarian to it, the chicken soft road, the soft potato, the tender corn, and the tender corn, but it is the first to close the door in the latest year’s rent.
Is his business not good enough? The fact is that every time we have to leave early, we can have seats. The crux of the problem is that other families have takeaway. Only Wang Kei insists on his taste and refuses to cooperate with all takeaway businesses. But he didn’t know that the Chinese office owners were not too concerned about the perfect taste when they were busy. He also did not know how much he missed in the pursuit of taste and how much lunch he did not want to go out.
You sigh: the seller of conscience is so few, but I still don’t cherish it. Have you ever thought about the reason? High quality products cannot be opened up, because you do not know “sell” quality service!
Dry cut king gives you different cutting experiences
Dry cut small sawblade of our dry cut king gives you different cutting experience, extraordinary temperament, dry cutting strength, the value added formula, in the cutting process, sharpness stronger, more handy.
Undefined
Dry cutting requirements for small diamond saw blades:
The structure of the 1. saw blade should be fast. In the dry cutting process, in order to ensure the quality of the workpiece and the life of the tool, the cutting tool can be quickly discharged, so that the heat of the incoming workpiece and the tool is greatly reduced.
The friction coefficient between the 2. chips and the cutting tools should be as small as possible. In dry cutting, the high temperature produced in the cutting area produces chemical instability, the friction between the cutting tool and the chip increases and the chip cutting speed slows down, and it is very easy to produce the chip tumor and aggravate the tool wear. Therefore, the friction coefficient between chip and cutter should be reduced.
3. to have excellent high temperature resistance performance: although in dry cutting, the heat produced in the cutting area can not be completely discharged with the chip, but as long as the cutting tool geometry and cutting parameters are selected reasonably, most of the cutting heat can be discharged with the chip, and good processing effect can be obtained.
Dry cut small saw blade without cutting fluid, save cost, protect the environment, give you different cutting experience, is the current more hot saw blade, but also a big progress in the saw blade technology.
A saw blade engraved on a concrete pavement
Road with a series of road concrete saw blade, the industry well-known alloy powder as a matrix formula, upgrading tool life, section type knife head, the road marks no longer need to worry, with the continuous promotion of road construction, carving tools will also continue to upgrade.
Undefined
Points for attention of road concrete saw blade for pavement cutting
1. in the first operation, the slowest speed should be used first.
2. to ensure the supply of cooling water, special water trucks and on-site water storage facilities are required.
The depth of the 3. section is controlled by the limiting wheel installed on the working floor of both sides of the cutter row, and it adjusts the relative distance between the cutter shaft and the road surface. When the diameter of the saw blade is reduced due to the wear of the cutter head, the wheel must be adjusted in time to reduce the shaft height of the saw blade so as to keep the depth of the cutting groove unchanged.
The cutting, cutting, filling and filling of concrete pavement with concrete saw blades.
1. marks: after the initial coagulation of the concrete pavement and reaching 1.2 to 2 Mpa, the print work can be carried out. The surface of the road is deep 0.5cm, the spacing of the lines is 2.7cm, and the width of each row is 40cm, with a special engraving machine.
2. cutting seam: the shrinkage joint of the concrete surface layer, the width of the contraction joint should be adapted to the cutting seam of the slit machine. The cutting method should be used as far as possible. The cutting speed should be slow and fast first.
3. filling and packing: the treatment of expansion joints of road concrete surface often adopts the method of filling filling and prefabricating flexible embedded seams.
Machining process of NC machine tool
Machining CNC lathe processing refers to the process of machining parts on CNC machine tools. CNC machine tool is a machine used to control the machine tool, used to control the machine tool computer, whether the special computer, or general computer are all known as numerical control system. The movement and auxiliary actions of CNC machine tools are controlled by the instructions issued by NC system.
The instructions of the CNC system are compiled by the programmer based on the material, processing requirements, the characteristics of the machine tool and the instruction format specified by the system (NC language or symbol). The CNC system controls the motion of the machine tool according to the program instructions to send servo or other functional parts to run or terminate information. When the parts processing program is finished, the machine tool will stop automatically. A CNC machine tool can not work without input instructions in its CNC system.
Machine parts of processing center 3-2
The controlled action of machine tool consists of the starting and stopping of the machine tool; the starting and stopping of the spindle, the rotation direction and the transformation of the speed; the direction, the speed and the way of the feed movement; the compensation for the choice of the tool, the length and the radius of the tool; the replacement of the tool, the opening and closing of the coolant, etc.
The CNC machine tool selected the aircraft parts with complex surface as the processing objects at the very beginning, and solved the key problem that the ordinary machining methods were difficult to solve. The most important feature of NC machining is to use perforated tape (or tape) to control machine tools for automatic processing.
The aircraft, rocket and engine parts have different characteristics: the aircraft and the rocket are zero, the component size is large, the surface is complex, the engine zero, the small size, high precision.
Therefore, the machined aircraft, the rocket manufacturing department and the engine manufacturing department choose the numerical control machine tool to be different. Large numerical control milling machines with continuous control are used in aircraft and rocket manufacturing, while continuous control CNC machine tools are used in engine manufacturing, and numerical control machines (such as NC drilling machine, NC boring machine, machining center, etc.) are used as well as point position control.
How are the elite salesmen in the fastener industry trained
What capabilities do the elite salesmen of the fastener industry need?
1. details are more important than eloquence
For customers to introduce products, do not need gorgeous rhetoric, description of the flamboyant, the product as the first love to understand, see through, for customers to introduce more details, manufacturing technology, factory conditions and so on.
Two
2. sincerity is more important than courtesy
With sincerity to move the customer, the product existing problems should be open and open, the objective analysis of the competitors and their own advantages and disadvantages, so it is easier to move customers, even if not this time, there will be more opportunities for cooperation in the future.
Two
The 3. eye is very important
Use idle time to learn more, learn more about the industry’s new trends, new products, new technologies, enrich their elite, broaden their horizons.
Every top salesman begins with a rookie. As long as it has good business attitude, business communication, business development ability, and continuous enterprising spirit, it is believed that Du en can achieve its own goal.
The working principle of remote control toys
Everyone’s childhood is not only accompanied by their parents, but also accompanied by their brothers and sisters. I was a 70, when the economic conditions were limited. In my memory, my mother bought me a “frog” toy. At that time, there were no such advanced intelligent toys as electric remote control, and the frogs bought by mom must be screwed up by hand to jump up. It should be a rare thing. This frog has been with me for a long time, and it has left me a good memory forever.
Now with the progress of science and technology, children are playing remote control electroplating intelligent series toys. Hundreds of thousands and tens of thousands, and everyone has a lot of toys. What kind of remote control car, remote control aircraft, remote control robot and so on.
The remote control toy car’s wireless remote control is realized: first, there are a lot of triode on the remote control, it can make the power supply to the pulse signal, and the principle of the operation principle of the remote TV remote control. Secondly, there is a chip in the remote control car to receive the pulse, the chip is also composed of the triode, and the receiver is generally controlled by the receiver. It is integrated with the emitter.
The remote controller has a battery patch directly connected to the battery, which is responsible for power transmission. The general battery has tinplate, stainless steel, manganese steel and brass. Tinplate is much more used in remote control toys, because tinplate has good electrical conductivity.
Development of 200 series stainless steel
The 200 series stainless steel was first developed in the United States as a substitute for the 300 series of stainless steel during World War II. At that time, as a result of the war, nickel as strategic material was strictly controlled by the countries concerned, and the supply of nickel in the United States was seriously insufficient. In order to solve the problem of the shortage of nickel supply and the production and supply of stainless steel, the United States has developed a series of new austenitic stainless steel with manganese instead of nickel.
After the end of World War II, the supply of nickel in the United States has gradually improved. Therefore, the production of 300 series of stainless steel is no longer restricted by raw material, so the 200 series has not been greatly developed. Several Indians, who had been involved in the development of 200 series of stainless steel, returned to India and brought back to India the 200 series of stainless steel varieties developed in the United States, starting from the fact that India was a relatively rich manganese resource and a lack of nickel resources.
The application of the 200 series stainless steel in India has been successful because of the possibility of replacing 304 stainless steel in some specific uses.
Most of the 200 series of stainless steel sold in the Chinese market did not control sulfur and carbon content according to the national standard, replacing some or all nickel with manganese (and nitrogen) to produce austenitic stainless steel with lower nickel content.
The defects of this series of materials are that the chromium content below 18% is not balanced with the low nickel content to form ferrite. Therefore, the chromium content in the 200 series stainless steel drops to 13.5% ~ 15%, and some cases fall to 13% to 14%, and the corrosion resistance is not compared with 304 and other similar steels. In addition, under the common acidic conditions in the depositional areas and the corrosion sites of the crevice, manganese and copper in some cases reduced the effect of re passivation. The damage rate of the 200 series steel under these conditions is about 10-100 times that of 304 stainless steel. It is often impossible to control the residual sulphur content and carbon content in these steels in production. Materials can not be traced and tracked, even in material recycling. If Cr-Mn steel is not stated, they will become a dangerous scrap mixed material, resulting in unexpected high manganese content in the casting.
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