Textile machinery is the processing of natural fibers or chemical fibers into various mechanical equipment needed for textiles. Although the production of chemical fiber machinery, including a variety of chemical machinery, is now considered to be an extension of textile machinery, a broad textile machinery. The process of processing different fibers, such as cotton, hemp, silk and wool, is different and some are completely different, so the machines needed are all kinds and various. Textile machinery is usually classified according to the production process, including spinning equipment, weaving equipment, printing and dyeing equipment, finishing equipment, chemical fiber drawing equipment, silk reeling equipment and non textile equipment. Spinning equipment is divided into two types: short fiber processing and long processing fiber. Cotton and cotton type synthetic fibers belong to staple fibers, such as wool, linen and silk.
Mixed fiber is a kind of long fiber. Two types of fibers have different processing procedures, and the equipment can not be used, but some machines have similar design principles. Even if the structure of the same type of equipment is similar to that of the machine, it is generally not universal because of the nature of the material and the final requirements for the fabric.
Textile machinery is the means of production and material basis of the textile industry. Its technical level, quality and manufacturing cost are directly related to the development of the textile industry.
Basic introduction of textile machinery
Large caliber spiral tube diffuser
At present, in China, the ductile iron pipe, plastic pipe (such as large caliber PVC tube), glass tube, prestressed concrete pipe, prestressed steel tube concrete pipe (PCCP), almost all of the buried pipes are connected with flexible interface, only the steel pipe line is also butted welding; in developed countries, such as the United States, buried water transfer steel. The preferred connection of the pipeline has also entered the flexible interface period. The butt welding has been a high cost interface, only under the harsh working conditions (more than 19 millimeters of steel pipe wall or more than 2.8Mpa of the pipeline working pressure). There is always part of the interface, which is difficult to guarantee the quality, which is the main cause of the pipeline burst accident. In order to solve the accident hidden trouble caused by the field butt welding, the Chinese counterparts have begun to pay attention to the flexible steel pipe interface. Therefore, it is entirely reasonable to say that the flexible interface is the best choice for the buried water pipeline, and it must be buried in water. The optimal selection of steel pipe line.
What is the difference between CNC machine tools and traditional machine tools
CNC machine tool is the abbreviation of Computer numerical control machine tools. It is an automatic machine equipped with program control system. The control system can logically handle the program with control code or other symbol instructions, and decode it, use the code number and input the numerical control device through the information carrier. After processing, all kinds of control signals are sent out by the numerical control device to control the movement of the machine tool and automatically process the parts according to the shape and size required by the drawings. Today, let’s look at the difference between numerical control machine and traditional machine tool.
1. High processing precision
The machining precision of the NC machine can reach 0.05 to 0.1MM, and the numerical control machine is controlled by the digital signal. Each output of a pulse signal, then the moving part of the machine tool moves a pulse equivalent (generally 0.001MM), and the average error of the reverse clearance and the screw distance of the machine tool feed drive chain can be controlled by the numerical control device. Therefore, the positioning accuracy of CNC machine tools is relatively high.
2. High productivity
CNC machine tools can effectively reduce the processing time and auxiliary time of the parts. The spindle speed and feed range of the CNC machine tool are large, allowing the machine tool to carry out the powerful cutting of the large cutting quantity. CNC machine tools are entering the era of high speed machining. The rapid movement and location of moving parts of CNC machine tools and high-speed machining have greatly improved productivity. In addition, with the tool library of the processing center, it can be used in a machine tool for continuous processing of multiple processes, reducing the turnover time between the semi-finished products and increasing the productivity.
3. Make use of the modernization of production management
The machining of CNC machine tools can estimate the processing time in advance, standardize the tool and fixture used, modernize the management, and easily standardize the processing information. It has been combined with the computer aided design and manufacturing (CAD/CAM) organically, and it is the basis of modern integrated manufacturing technology.
4. Improve labor conditions
Before the NC machine is processed, the machine can be automatically and continuously processed until the processing is finished. The operator has to do only the input, editing, parts handling, tool preparation, the observation of the machining state, the inspection of the parts and so on. The labor intensity is greatly reduced, and the labor of the machine operator tends to be intelligent. In addition, machine tools are generally combined, clean and safe.
5. The quality of processing is stable and reliable
Processing the same batch of parts, in the same machine tool, under the same machining conditions, using the same tool and processing program, the tool path of the cutter is exactly the same, the parts have good consistency, and the quality is stable.
6, with high flexibility
Machining parts on CNC machine tools, mainly depends on the processing program, it is different from the ordinary machine tool, do not have to make, replace many moulds and jig, do not need to adjust the machine tool regularly. Therefore, the CNC machine tool is suitable for the frequently replaced parts of the processed parts, that is, it is suitable for single piece, small batch production and the development of new products, thus shortening the production preparation period and saving the cost of a large number of technological equipment.
Use of sand jars
The 1. sandblasting tank is to use 5-7 kilograms / square centimeter of compressed air to drive the sand through the special nozzle, and spray on the metal surface at high speed to achieve the purpose of rust removal. This method of rust removal is based on the impact and friction of the angle of ordinary sand. It makes the rust and other pollution completely removed, and a surface with a certain roughness and showing the intrinsic color of silver gray metal is obtained. Thus, the anticorrosion layer has good bonding force.
2. the sand jar equipment is generally said to have two forms. When the sand particles are in the sand tank, the pressure is pressed into the compressed air and then pressed into the three pipe part of the bottom of the tank, where it is then mixed with the compressed air and transported along the rafters to the nozzle to be ejected.
3. the suction sand is compressed into the nozzle and is ejected together. This effect is due to the vacuum caused by high velocity compressed air. Because the ore particles themselves do not need pressure, so it is not necessary to have a special sanding tank, which can be directly sanding in a human sand pile with a hose, so the equipment is simple, convenient to carry and convenient for construction (as long as the conditions of compressed air) are convenient, and the wear of the hose is small, but the production efficiency is low, and the inhalation is high. It has a certain range, the operation control is not convenient, the sand flow is easy to cause the intermittent phenomenon. It is not suitable for the needs of production and development, so it has been less used in the actual production. We mainly introduce the extruded sand jar.
4. structure and operation process of sandblasting tank: there are two kinds of sand jar structure in general, and the sand jar is welded by ordinary carbon steel. After the equipment is made, it should be inspected according to the requirements of the general pressure equipment. The outer cone of the valve should be lined with rubber outside, so that it is easy to compress the bell mouth part of the lower part of the charging port and play a sealing role.
What are the safety precautions when sand blasting is removed
1, in the sand blasting construction, do a good job of personal safety protection, wear the necessary protective equipment, can not be naked arm work, to avoid harm to the body;
2, at least two people should be kept in construction, not less than two persons, so that the situation can not be handled in time.
3. The air compressor needs to be checked before the air compressor is used to ensure the seal. When the jet is ejected, it needs to be tested. If the ventilation and dust removal equipment fails, the sand blasting will be stopped.
4, the air compressor pressure is best not to exceed 0.8MPa, and when using the air compressor, the valve needs to be opened slowly, not too urgent.
5, when the jet is working, no staff should be approached to avoid injury to the personnel, and the injury intensity will be considerable.
6, prohibit the alignment of personnel.
7, after the use of the dust removal equipment will stop running for 5 minutes, then shut down, to avoid damage to the machine.
How to solve the problem of stainless steel production by continuous laser welding machine
Stainless steel
Stainless steel is the most widely used steel surface treatment method in the world. The word “stainless steel” is not just about a single kind of stainless steel, but more than one hundred kinds of industrial stainless steel. Each kind of stainless steel developed has good performance in its specific application field. The key to success is first to clarify the purpose and then to determine the right type of steel.
304 steel
Now, the 304 largest steel company we deal with is steel. 304 for many people, they may just listen much, but actually they don’t know what it means. 304 is in fact a general model, that is, 18/8 stainless steel. Products such as corrosion resistant containers, tableware, furniture, railings, medical equipment. The standard component is 18% chromium and 8% nickel. The stainless steel is non-magnetic and can not be changed by heat treatment to change its metallographic structure.
Some stainless steel manufacturers are now commonly used in argon arc welding and other ordinary welding machines. Although these can meet the needs of production, they will leave welding defects in the process of welding, such as bite, non penetration, dense pores and cracks, not only to reduce the firmness of the joint, but also to corrosion corrosion. Source. In the welding process, not only the welder’s technology has a certain level, but also the welding skills and the cost of flux are too large, which will improve the cost of production. Moreover, the working procedure after welding will bring unnecessary trouble. Technology is progressing. It is because of these defects that the new type of stainless steel continuous laser welding machine is born.
The continuous laser welding machine of stainless steel – small power pulse laser seam welding has the advantages of high power density, energy concentration, small heat input, narrow weld and small deformation, and the laser beam can get very small spot and precision positioning. These features make the laser seam welding more suitable for small size workpiece than his welding method. Welding. For ultra thin stainless steel laser welding, because of the thin material, it is easy to vaporize the perforation, so as to get a continuous, non burn weld. The key is the precise control of the parameters.
Safety regulations and safety protection of longitudinal welder for argon arc welding
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.
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%.
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