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Common sense for the selection and purchase of hardware accessories

Look at materials: Lock materials in the market are basically divided into stainless steel, copper, zinc alloy, iron steel and aluminum materials. Stainless steel has good strength, strong corrosion resistance and constant color. It is the best material for lock making. Copper is more common, mechanical property is superior, price is more expensive, high quality zinc alloy is strong and wear-resistant, corrosion resistance is very strong, easy to form, generally used to make middle lock.
Weigh the weight more than the hand: weigh the weight, listen to the hand, listen to the sound, steal the material, make the material with the hollow material and the inferior material. This material weighs light, the use is very poor, the sound is very dull, and the good lock is the opposite.

We must pay attention to the classification of towing chains in different forms

Drag chains can be classified according to different ways, and are summarized. Please pay attention when purchasing.
According to the material, it can be divided into: Steel drag chain, steel aluminum drag chain, plastic drag chain, nylon drag chain and so on.
According to the form, it can be divided into: Bridge drag chain, multi bridge towing chain, closed towing chain, silencing drag chain, open drag chain, Wan Xiang drag chain, tank chain, threading drag chain and so on.
According to the requirements of the environment: oil, waterproof, anti waste pollution, high temperature resistance, friction resistance, need to lengthen, need weight bearing, no noise, cable covert, etc.
Three types of assembly: Bridge drag chain, fully enclosed drag chain and semi closed drag chain.

Wide application range of inclined mixer

With the continuous development of the mixer industry, in order to meet the demand of the market, the inclined mixer can be adjusted according to the different properties of the material to meet the needs of the product and adjust the speed according to the needs of the product. This makes the application of tilting mixer wider and more applicable.
The inclined mixer is a mechanical equipment which integrates mixing and granulation. The mixing tool runs at high speed according to the principle of countercurrent. The counterforce of phase reverse makes the material scatter and mix again and again to achieve the purpose of mixing and uniform at a faster speed.

Advantages of inclined mixer
(1) tight assembly of machine assembly. The mixing gap between the mixing arm and the mixing tank is small, and the mixing and granulation without dead angle can be realized.
(2) the machine can be adjusted according to the performance of materials to meet the needs of materials. Granulator has a wide range of operation, and can be adapted to granulating various particles.
(3) using the countercurrent relative principle, the material can be extruded strongly, so that the material can be dispersed and mixed repeatedly, and the granulation is uniform.
(4) the material has a stable high quality, and the equipment can guide the flow rotor of the material in the barrel to make the full mixing of the material.
(5) the wear of the equipment is small, and it can save a lot of maintenance cost.
The inclined mixer is widely used in the field of refractory industry, building material, metallurgy, compound fertilizer, ceramics, fly ash, glass, casting, chemistry. With the continuous development of the mixer industry, the agitator technology is constantly updated. In order to adapt to the development of the market, the enterprise should not be able to do it. Continuous innovation, to automation, professional direction.

New technology of template strengthening: replacing steel with steel to achieve total duration compression

For a long time, our country’s Construction Engineering turnover material is most of the round pipe, wood and other materials consumption is very large, the impact of the environment is not said, the quality of construction is always the existence of such or such problems. With the rapid development of the construction industry, the construction materials have also undergone tremendous changes. Standardization and industrialization are changing the details of the construction production.
The traditional template reinforcement system is highly dependent on the technical level of the workers. Because of the technical differences, it often leads to the imprecision of the joint, the phenomenon of explosion and the rise of the mold. These uncontrollable factors can easily lead to construction quality, efficiency and safety problems, and standardized construction can hardly be effectively controlled.
The steel bracing system with high strength and high strength made of recycled high strength all steel material has been more and more popular in construction enterprises because of its high durability and long life, and “zero pollution” from processing production to storage and storage.
The traditional formwork system uses a large number of fittings such as round pipe, wood side, fastener and so on, and the formwork process is complex. The construction of steel bracing reinforcement system is simple in structure.
It can be clearly seen from the construction site that the built – up steel bracing and strengthening system is neat and beautiful. After dismantling, the waste materials such as sawdust and residual ash are accumulated, and the construction environment is clean and tidy. The traditional formwork reinforcement construction site is rather messy. After the demolition of the mold, the dismantling of the materials and the discarded refuse need to be cleaned two times. The two are in sharp contrast.
From the effect of wall shaping after the removal of the mould, the steel supporting and reinforcing system built in the days is smooth and smooth, and the molding effect can be maintained for many times. Relatively speaking, after several times of the traditional reinforcement system, the surface of concrete casting is slightly rough, which is quite different from that of the former. Nowadays, the built steel bracing reinforcement system has been widely used in all parts of the country, and has received wide acclaim.

The historical evolution process of the unintentional grinder

A centerless grinder is generally considered to be the only machine that can grind planes. The development trend of flat grinding is steering molding, step, cut in, rapid jitter, and 3D surface grinding. It can be said that centerless grinder is the most potential type of machine tool in grinding machine. China’s flat grinding manufacturers should jump out of the traditional thinking of plane grinding and go to the train of thought of non plane grinding, such as curve or contour, to form our own characteristics of technology and products. Most small centerless grinding machines are grinding with high speed rotating grinding wheels. The few are processed with other grinding tools and free abrasives such as oil stone, sand belt, etc., such as honing machine, superfinishing machine tool, abrasive belt grinding machine, grinding machine and polishing machine. Small centerless grinder can process high hardness materials, such as hardened steel, hard alloy, etc., and also can process brittle materials, such as glass and granite. Grinder can be used for grinding with high accuracy and small surface roughness, and also for efficient grinding, such as strong grinding.

In 30s eighteenth Century, in order to adapt to the hardened processing of parts, such as clocks, bicycles, sewing machines, and firearms, the United Kingdom, Germany and the United States developed a grinder with natural abrasive grinding wheels. These small and careless grinders are made of machine tools such as lathe and planer, such as lathe, planer and so on. They are simple in structure, low in stiffness, and easy to produce vibration during grinding. The development trend of centerless grinder is steering molding, step, cut in, rapid jitter, and 3D surface grinding. It can be said that grinder is one of the most potential evolution machines in grinding machines. Our grinders should jump out of the traditional thinking of plane grinding and go to the train of thought of non plane grinding, such as curve or contour, to form our own characteristic technology and products. Basically represents the current international machine tool technology development trend and level of foreign manufacturing technology exhibition not long ago.

In the development of centerless grinder, its working schema has undergone a tortuous process. The initial centerless grinder is a single wheel type. The grinding wheel faces or circumferentially grind. The support and continuous contact of the workpiece depend on the stopper, guide plate and spring. It was not until 1915 that the pallets and the guide wheels began. With the appearance of guide wheel and supporting plate, the machine design and grinding process of centerless grinder have entered a new historical period. Because of historical reasons, the industrial layout of more than 1000 enterprises in the grindless tool industry in our country has converged in the domestic industrial layout, resulting in the production amount is not small and the low level of duplication of construction is serious; the large, small and complete phenomenon exists widely, and the enterprises have strong self-supporting consciousness, long production cycle, high cost, and the whole machine performance and performance. Reliability is not guaranteed and market demand is slow.

With the growing diversification and diversification of our country’s economy, the careless grinders have also written a lot of brilliant mechanical triumphs in the history of China’s machinery industry. In fact, according to the statistics of our country, the unintentional grinder has shown a trend of great change in the last three years, but it has increased but will also decrease. As a whole, the trend of growth shows that the market in China has become more and more short of demand now, so it is said that in the future, there will be a big fluctuation in the market of unintentional mould in China, but in a certain practice, his production and sales will not fall.

The difference between the line rail and the hard rail of a machining center

The hard rail of the machining center refers to the casting parts which are integrated with the guide rail and the lathe bed, and then the guide rail is machined on the basis of the casting. That is, the shape of the slideway is cast on the bed, and then the guideway formed after quenching and grinding, the bed and the guideway are not necessarily integrated, such as the steel guide, which is connected to the bed after processing.

The line rail of the machining center usually refers to the rolling guide, which is used in the linear module often used in the machine tool industry. We usually call this kind of element “linear guide”.

The linear guide itself is divided into two parts: slide rail and slider. There are internal rollers or rollers in the slide block, and the length of the slide rail can be customized. It is a modular component, a standarized series of separate products produced by a specialized manufacturer, which can be installed on a machine tool and can be disassembled and replaced after wear.

Many machine tools in the field of fine processing, most of which use high precision line rail as machine tool guide, which also greatly guarantee the machining accuracy of machine tools, imported German Rexroth, Japan THK, domestic do better Nanjing technology, Hanjiang line rail, Taiwan silver and so on.

Is the machining center a good hard rail? Is it a good line?

In fact, there is nothing to say about hard rail and wire rail, but it can only be said that they are not suitable because their emphasis is different.  Let’s take a look at their respective advantages and disadvantages.

The advantages and disadvantages of 1. hard rail and its application

The hard rail has large sliding contact surface, good rigidity, strong earthquake resistance and strong bearing capacity, and is suitable for heavy load cutting.

Hard rail belongs to dry friction. Due to the large contact surface, the friction resistance is greater and the speed of movement is not too fast.  At the same time, it is easy to creeping. The gap exists on the moving surface, which leads to machining error. The maintenance of the machine tool track is the weight of the heavy, once the track lubrication is not enough, it will cause the track burn or wear transition, which are fatal to the precision of the machine tool.

The application of hard rail is suitable for heavy cutting, large mould, high hardness workpiece and general workpiece with accuracy requirement.

The advantages and disadvantages of 2. line rail and its application

Now many machine tools run fast, especially the air range speed, which is largely dependent on the line rail. The line rail can achieve zero gap between track and high precision through pre tightening. As far as the service life is concerned, the line rail is much higher than the hard rail.

The cutting force of the line rail is smaller than the hard rail, but for the hard rail, the line rails of many machine tools have greatly improved their carrying capacity.

The application of wire rail is suitable for high speed machine, high speed cutting, suitable for processing products and small precision moulds. Today, more precision machining centers use wire rails.

What problems should be paid attention to in CNC lathe fixture

CNC lathe is a clamping and continuous automatic processing to complete all the turning processes. Therefore, we should pay attention to the following aspects:

1. reasonably choose the cutting amount of numerical control lathe
Whether the selection of cutting amount (AP, F, V) is reasonable is very important for the full use of the potential of the machine tool and the cutting performance of the tool, and the realization of high quality, high yield, low cost and safe operation.
When the car is rough, first consider the choice of a large amount of back knife AP, and then select a larger feed F, and finally determine a suitable cutting speed v. Increasing the amount of AP can reduce the number of cutting tools and increase the feed f to break the chip. Therefore, it is beneficial to select the cutting amount of the rough vehicle according to the above principles to improve the production efficiency, reduce the cutting tool consumption and reduce the processing cost.
When finishing the car, the machining precision and the surface roughness are higher and the machining allowance is small and even. Therefore, when choosing the cutting amount of the fine car, we should pay more attention to how to ensure the processing quality and improve the productivity on this basis. Therefore, the smaller (but not too small) back knife and feed F should be selected, and the cutting tool material with high cutting performance and reasonable geometric parameters should be selected to improve the cutting speed V as much as possible. NC lathe circuit diagram
2. reasonable choice of CNC lathe tool
1) when the rough car is used, the tool with high strength and good durability should be selected so as to meet the requirements of large back cutting and large feed in rough lathe; NC programming for wide number 980 NC lathe
2) when finishing the car, the tool with high accuracy and good durability should be selected to ensure the machining accuracy. ;
3) in order to reduce the tool changing time and facilitate the tool setting, the clamp and blade should be used as far as possible.
3. reasonable choice of CNC lathe fixture
1) try to use universal fixture to clamp workpiece and avoid using special fixture.
2) part positioning datum coincides to reduce positioning error. Full automatic numerical control lathe price
4. determine the machining route of numerical control vehicle
Machining path refers to the movement path and direction of the tool relative to the parts in the numerical control machine tool processing.
1) the processing precision and the surface roughness should be guaranteed.
2) we should shorten the processing route and reduce the idle travel time of cutting tools.
5. connection between processing line and processing allowance
At present, under the condition that numerical control lathes have not reached universal use, the excess amount of blanks, especially the allowance for forging and casting hard layer, should be arranged on the ordinary lathe. If CNC lathe is necessary, attention should be paid to the flexible arrangement of the program.
6. gist of fixture installation
At present, the connection between the hydraulic chuck and the hydraulic clamping oil cylinder is realized by a pull rod. The main points of clamping the hydraulic chuck are as follows: first unload the screw cap on the hydraulic cylinder with the hand, unload the drawing pipe, draw out from the rear end of the main shaft, and then unload the fixed screw of the chuck with the hand, then unload the chuck.

The shortcut is to walk every step of the way

I have a friend who has been promoted to department manager through his parents’ relationship in less than two years. In other people’s opinion, it is really lucky to have such a shortcut. But in the next few years, friends are becoming more and more powerless in their work.
Although he has a certain prestige as a manager, his employees only have superficial respect for him, and they do not obey him in private. After all, the friends are still young, the professional experience is shallow, their ability to be improved, the reaction is not too mature, and even often give his team the wrong direction of the wrong direction.
For example, he insisted that “wine fragrance is not afraid of the alley”; when it is to do the product, he put his energy on the extension business; when it is to do fine management, he insists on the extensive management model.
Having realized the seriousness of the problem, friends decided to put aside their airs and work with the grass-roots employees of the company from the most basic work. From design, production, packaging products to how to find channels, do sales and expand business, he takes every step to make up all the homework before.
Friends say that when they have the ability to become managers again, their hearts are steadfast, steady and calm.
Many of us tend to be anxious to get a promotion and pay raise when our ability is not enough. At this point, what we should do is not to concentrate our efforts on climbing up branches, but to settle down and work hard. If the foundation is unstable, it is necessary to omit the process of adding bricks and tiles to oneself. Then, even if it occupies a high position, it will be crumbling and may even fall very badly.
I remember when I first started learning a car, I especially liked to add it before the speed was raised. Sometimes, when the speed is 20 yards, I add to the 4 gear. The result is that the car is shaking violently, and it will be easily extinguished.
Later, the coach taught me that we must first mention the corresponding speed, so that the power of the car is enough, and then step on the clutch, shift gears, gas door. In this way, the car will smoothly connect, and then move on.
In fact, human growth is the same as driving. At the beginning, when you use 1 gears, it is almost impossible to drive the car in 5 gears. A little progress, and then 2 gear, 3 gear forward at a uniform speed.  When you are young, you read books, you have knowledge, and you finish your job, then you can go to work. But it is impossible to succeed at the very beginning.
When you are mature enough, you can change gears 4 and 5. Just like people in middle age, they can often carry on the task, bear the blame, and have some skills to climb the peak of life.
In every stage of life, there is no shortcut. If you want to grow up, you need to go all the way to experience and experience, and gradually gain experience and experience in the process.
I have seen a story.
A mother, who had traveled far and wide, after many twists and turns, took her 8 year old son to find a famous writer’s residence. The mother pleaded with the writer and asked him to teach his son to write a good article which was astonishing and then let his son become famous in a short time.
The writer was very helpless, so he wrote the secret on a piece of paper and put it in the envelope, so that she could take her child home to see it.
As a result, when the mother came home, she looked at it hastily and found only three words on it.
It’s not surprising. All people have to lay the foundation for success. If you want to write a good article, you will have fluent writing, clear thinking and ingenious layout as well. In this process, the books you should read, the exercises you should do, the trial and error you should have and the attempt you have to do are equally indispensable.
Four
When I was a child, I often asked adults when they could be like them, without reading or writing homework, and playing for as long as they wanted to play.
At that time, the adults always told me that you still have a long way to go. So, I wait and wait, wait for, look forward, read the primary school, into high school, to high school, into the University, and then really grow into an adult only to discover, the original growth way, really did not drop a somersault, test less one time, less one year book.
Everything in the world has its laws, such as spring seed, summer long, autumn harvest and winter storage. When you keep your mind, don’t be in a hurry. When you work hard, don’t try to make a surprise. When you sharpen your mind, you can’t ask for a sudden enlightenment.
The more reliable your foundation is, the more complete your process is, the longer your efforts persist, and your growth will be more prone to qualitative leaps. In the end, you will understand that in this life, many things are not urgent. If you want to harvest, the pain of eating, the sweat of the stream, and the tired of it should not be less.
Some setbacks can not be avoided, some processes are not allowed to be saved, and some shortcuts are not feasible. So don’t worry, don’t panic, and don’t play smart. Believe that the quickest way to success is not to overtake corners. Every day and every year, we can finally lead a good life.

Which parts are made up of the basic structure of the power cable

What are the functions of power cables and the requirements for their materials?

(1) the basic structure of power cable. The power cable is mainly composed of four parts: core (also called conductor), insulation layer, shielding layer and protective layer.

(2) the role of each part and the requirements for the use of materials:

The core is the conductive part of the cable, which is used to transmit electric energy, and is the main part of the cable.

The requirements for wire core materials are good electrical conductivity, good mechanical properties and abundant resources.

The insulation layer separates the core from the earth and the core with different phases on the electrical side to ensure the transmission of electric energy. The requirements for insulating material are high pressure resistance, low dielectric loss, good corona resistance, stable chemical properties, low temperature resistance, good heat resistance, good mechanical processing performance, long service life and cheap price.

6kV and above cables usually have conductor shielding and insulation shielding.
The function of the shielding layer is to eliminate the unsmoothness of the surface of the conductor (the tip produced by the multi wire twisted pair), which causes the increase of the electric field intensity on the surface of the conductor, so that the insulating layer and the cable conductor are in contact with the conductor effectively.
In order to better contact the insulation layer and the metal coat, the outer shielding layer is usually covered on the outer surface of the insulation layer.
Requirements for shielding material:
The conductor shielding material of oil paper cable is usually metallized tape or semi conductive tape. The insulating shield generally uses a semi conductive paper tape.
Plastic or rubber insulated conductors or insulated shielding materials are semi conductive plastic and semi conductive rubber respectively.
Plastic and rubber cables without metal sheathed are shielded copper or copper wires outside the insulation shield.

The protective layer is to protect the cables from external impurities and water intrusion and prevent external forces from damaging the cables directly. The requirement for the protective layer material is that the sealing material and corrosion resistance of the protective layer material must be good and have certain mechanical strength.

Application of steel strip packing machine in rare metal industry

The steel strip packing machine is widely used in steel, zinc ingot, lead ingot, aluminum ingot, steel plate section, copper copper pipe, horse iron, wire rope and so on. The selection of steel strip packing machine can be selected according to the width of steel strip, the way of biting and manual packing and pneumatic packing.
First, the manual steel strip packing is not restricted by the packing site. It is usually made up of manual steel belt tension machine and manual steel belt locking machine. The locking machine is divided into two teeth bite buckles and single tooth bite buckles. The manual steel belt packer and the form of non buckle packing are not needed for the steel buckle to achieve the effect of the bundle.
Two, the pneumatic steel belt is packed with compressed air as the driving force to achieve the effect of tightening and biting.
1: the separation type pneumatic steel strip packer is composed of pneumatic steel belt tension machine and pneumatic steel belt locking machine. First, tension machine is used to reach the purpose of tightening, and the lock press is used to lock the steel belt and the steel belt is cut and cut.
2: the linkage pneumatic steel belt baler, which integrates tension, biting and cutting, can improve work efficiency.