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With the large-scale use of rubber products, the problem of waste rubber pollution has become more and more serious. The waste rubber mainly comes from scrapped automobile tires. The rapid development of the automobile industry has continuously increased the generation rate of scrap tires. How to realize the recycling and utilization of waste rubber is of great significance to the sustainable development of rubber industry.
It is understood that the current disposal methods of waste tires mainly include the production of reclaimed rubber and retreading. In our country, the processing methods of waste tires are mainly based on the production of reclaimed rubber, which has developed rapidly in recent years.
The emergence of reclaimed rubber is a dawn to solve the problem of "black pollution". Reclaimed rubber not only solves the current pollution problems of waste tires and waste rubber, but also alleviates the current shortage of rubber resources. Making waste rubber to reclaimed rubber is the best solution to solve the problem of "black pollution" other than retreading, which accounts for as much as 60% of the total recycling of used tires.
Therefore, the problem of recycling and utilization of waste tires has attracted more and more attention from all walks of life, and the business opportunities contained in it have also been favored by related companies and investors. In recent years, many reclaimed rubber companies have basically achieved pollution-free production after technological transformation, and are moving in the direction of "green industry", bringing greater profits to the majority of rubber product manufacturers.
In addition to reclaimed rubber, more and more waste rubber and waste tires have also been crushed into rubber powder. The application range of rubber powder is wide. At present, rubber powder has been used to many new products such as waterproof coatings, rubber powder modified asphalt, etc., and has been well received by rubber product manufacturers after trial and use.
The "black pollution" that was hateful in the past has turned into "green wealth" in an instant. It can be seen that the reclaimed rubber and reclaimed rubber powder play a great role in the recycling of "black pollution".
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How to judge whether the cutting tool needs surfacing repair?
1. When the edge of the cutting tool is worn to form a fillet of about R3, it needs to be repaired.
2. If the discharging granularity becomes larger, and the shredder jams or frequently reverses when it is working, the cutting tool need to be repaired.
How to repair cutting tool of metal shredder machine?
1. Remove the cutting tool from the shredder machine after confirming that the cutting tool meets the repairable conditions.
2. Clean the cutting tool, remove surface oil stains and other matters that affect welding.
3. Preheat the cutting tool as needed.
4. For welding worn surfaces, the welding wire should select imported wear-resistant welding wire with good bonding performance and high hardness. The hardness of the welding wire is 55-60HRC and 50-55HRC. The service life after repair is determined by the material for renovation.
5. For machining according to the drawings, the thickness of the cutting tool is important, which affects the service life of the cutting tool.
6. Acceptance of cutting tools.
7. Installed.
Note: Generally, cutting tools can be repaired more than 3 times.
In order to ensure the welding quality of the blade, the blade after being welded should be carefully inspected to find out the cause of the defect and improve it. Before inspection, the blade should be sandblasted or lightly ground to remove the solder and impurities adhering to the surface of the blade, and cleaned with kerosene.
The inspection items and requirements are as follows:
1. Check the strength of welded joint: Grind the back of a blade with a green silicon carbide grinding wheel, and check the thickness of the solder layer, the thickness is required to be below 0.15 mm. There should be no pores and insufficient solder on the bottom surface of the cutting tool tip bearing, and the weld that is not filled with solder should be no more than 10% of the total length of the weld. If there are air holes, the blade will fall off during cutting.
2. Check the position of the blade in the slot: If the blade is misaligned or sag in a unnormal conditions, re-welding is necessary.
3. Check the welding strength: Hit the blade with a wooden hammer or a copper hammer with medium strength, it’s qualified f the blade does not fall off the knife body. To check the welding strength of the blades, you do not need to check all of them one by one, spot checks is OK.
4. Check the flatness of the blade: If there are obvious pits on the blade, it means that the blade is overheated and deformed, and the blade should be burned and re-welded.
5. Check the cracks: After the blade is cleaned with kerosene, if the blade has cracks, kerosene will penetrate into the cracks and appear black lines, which can be observed with the naked eye. It can also be observed with a magnifying glass of 10-40 times.
Color flaw detection can also be used to check the blade cracks: Make a solution of 65% kerosene, 30% transformer oil and 5% turpentine, and a little Sudan red. Put the blade in the solution for 10-15 minutes, then wash it with water, apply a layer of white clay (kaolin), and observe the surface after drying. If there are cracks on the blade, the color of the solution will be appeared on white clay, and can be seen with the naked eye. The cracked blade cannot be used and needs to be re-welded.
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Correctly Maintain the Blade of Shredder Machine to Extend Its Service Life
1. The blade should be selected reasonably according to the hardness and strength of the shredded items.
2. Prevent damaging to the blade during the installation.
3. Pay attention to the wear of the blade, whether there are other foreign objects on the blade and the rotating shaft, and frequently clean up the debris on the blade. Pay close attention to the cutting edge of the to-be-shredded materials, which can reflect the existing situation of the blade.
4. When the waste tire shredder is not working, coat the shredder blade and the middle shaft with lubricating oil frequently, which can not only reduce friction, but also prevent the shredder blade from rusting and extend its service life.
5. Make a statistics on the energy consumption of the shredder. When the current suddenly increases during a certain period of time, it indicates that the shredder works under bad condition. It is necessary to immediately stop and check the machine, generally, the shredder blade has foreign matter which prevents the blade from cutting objects.
6. The blade of the double-shaft shredder should be polished regularly. For example, the knives used in our lives will become unsharp after using a long time. The blades of the shredder need to be polished with professionally sharpening tool, so as to ensure its sharpness.
The Grinding Process Is Suitable for Lightly Worn Cutting Tools
1. Grinding with a surface grinder, because the grinding effect of a surface grinder is very good. Using a surface grinder to polish the edge of the metal shredder blade can effectively protect the blade, and the quality of the polishing is guaranteed.
2. The polishing machine uses a grinding wheel to polish the inside of the cutting edge. Note that the arc planing of the claws must be strictly controlled, and it must be straight with the plane of the shredder blade, so as to wear knife body in the minimum. The proficiency of operator also helps a lot in the polishing process.
3. Grinding with an automatic sharpener: If you want to save time, an automatic sharpener is undoubtedly the best choice, and the operation is simple and easy to master.
original page:
https://www.shreddingtech.com/blog/ways-to-maintain-the-blade-of-shredder-machine.html
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The first misunderstanding of copper scrap recycling:
Some people believe that copper is a long-term shortage of metal in our country, and there is no surplus pressure. Building copper smelting projects can also make full use of foreign mineral resources, therefore, copper smelting projects should not be restricted. The above point of view is actually one-sided. Our country is indeed short of copper. However, building a copper smelting enterprise does not produce copper itself, but processes copper concentrates into electrolytic copper. Therefore, the construction of a copper smelting project can only turn the demand for electrolytic copper into a demand for copper concentrate, which only changes the structure of imported copper series products, and has nothing to do with improving copper self-sufficiency level of our country.
The second misunderstanding of scrap copper recycling:
As the copper smelting industry is restricted by foreign mineral resources, some people advocate developing copper resources abroad at any cost. Making full use of foreign mineral resources is a good thing in itself, but good things must be done well. Although there is a shortage of copper resources in China, there is no shortage in the world. If we are rushing to develop copper mines abroad when the price of copper in the international market is soaring irrationally, scrap copper recycling will inevitably raise the basic price. If you do not examine the development of the copper smelting industry from the perspective of strategy and sustainable development, you may not be able to take the initiative even if you control some copper resources. For example, our country controls more tungsten, tin, antimony and ion-type rare earth minerals in the world, but we have not taken the initiative in the development of the industry.
The third misunderstanding of scrap copper recycling:
Copper price plummeting may happen at any time. Once copper prices fall and foreign copper mines reduce production, the contradiction of excess copper smelting capacity will be exposed, and the tragedy of the electrolytic aluminum industry will repeat itself in the copper smelting industry. From the analysis of the production cost of copper, the comprehensive cost of recycling foreign scrap copper is about US$1,800. Although the grade of copper in our country is low and the cost is relatively high, it is only about 20,000 yuan. The huge profits of the copper industry far exceed reasonable levels, indicating that the copper price contains huge risks.
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The main classification of scrap wire and cable
According to voltage level:
1. Low-voltage cables: suitable for power transmission on AC 50Hz and rated voltage 3KV and below.
2. Medium and low voltage cables (generally refers to 35KV and below): PVC insulated cables, polyethylene insulated cables, cross-linked polyethylene insulated cables, etc.
3. High-voltage cables (generally 110KV and above): polyethylene cables and cross-linked polyethylene insulated cables, etc.
4. Ultra-high voltage cable: (275～800 KV).
5. UHV cables: (1000 KV and above).
According to the electric current:
1. AC cables (alternating current cables)
2. DC cables (direct current cables)
Classified by insulation material:
1. Oil-impregnated paper-insulated power cable. Its application history is the longest, and it is safe and reliable, with a long service life and low price.
2. Plastic insulated power cable, means the insulation layer is extruded plastic. Commonly used plastics are polyvinyl chloride, polyethylene, and cross-linked polyethylene. The plastic cable has simple structure, convenient manufacturing and processing, light weight, convenient laying and installation, and is not restricted by the laying drop. Therefore, it is widely used as medium and low-voltage cables, and has a tendency to replace viscous-impregnated oil-paper cables.
3. Rubber insulated power cable. It is soft and flexible, and is suitable for occasions with frequent movement and small laying bending radius. The rubber materials commonly used for insulation include natural rubber-styrene butadiene rubber mixture, ethylene propylene rubber, butyl rubber and so on.
Recycling methods of waste cables
It is inevitable that some waste materials will be produced in life, but how to deal with the waste copper produced in various industries. According to the quality requirements of recycled products, the processing of waste copper can be divided into pyrometallurgical smelting and electrolytic smelting. The production of blister copper and copper alloys generally uses the fire method, while the production of electrolytic copper generally uses electrolysis.
Classification of scrap copper after recycling
A: Bare, uncoated and alloy-free pure copper wire, with no oxidation on the surface, no wool, and the diameter of the copper wire is not less than 1.6mm.
B: Clean, colorless, uncoated, tin-free, alloy-free pure copper wires and copper cables, and does not contain wool and burned fragile copper wires.
C: Unalloyed scrap copper wire contains miscellaneous materials, with a copper content of 96% (minimum content of 94%). It must not contain excessively leaded and tinned copper wires, soldered copper wires, brass and bronze wires, excessive oil, scrap iron and steel and non-metals, brittle burnt wires, insulated copper wires, and excessive fineness silk.
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Used tires have extremely high utilization value and can provide society with a large amount of renewable resources
Waste tires are full of treasures, 16%-18% of the steel wire contained is the raw material of high-quality spring steel; up to 80% of the rubber mixture can be made into useful reclaimed rubber and rubber powder with different particle sizes, which can be used in rubber and building materials and industrial fields such as plastics and coatings. Waste tires are also high-energy fuels, containing 27.59KJ of heat per kilogram, which can be used for power generation in industrial boilers and thermal power plants.
Tires are used to carry tens of tons of items to keep running, so the quality of the rubber used in tires is much higher than other rubber products. The tire rubber must be wear-resistant, prevent aging, waterproof, and be able to absorb shock, therefore, waste tires are a great waste of resources. If the waste tires are physically broken by waste tyre shredder and recycled by waste tire recycling line, rubber particles, rubber powder, and steel wires can be obtained. These rubbers can be used in many fields, such as roadbed paving, Rubber track, various rubber products, etc.
1. Laying of sports grounds: runway, school playground, around swimming pool and garden trails, bowling alleys, sidewalks, kindergarten playgrounds and entertainment fields, tennis and basketball courts, etc.
2. Automobile industry: train floor mats, brake disc ribbons, floors of cars and trucks, brake bushings, sealing strips, buffers, shock absorbers, bottom seals of automobile body and stainless steel materials, splash mud, tires and tire inner pads, etc.
3. Construction/building: Adhesives/sealants, hospitals, companies, bathroom floors, insulating rubber materials, carpet pads, livestock straw mats, extrusion products, waste brake surfaces, mold products, coatings, dams, warehouses, ponds, waste treatment station, brick roof liner and covering, raised patterned floor, house sign, waterproof material, shockproof, gasket, waterproof material for roof and wall, etc.
4. Civil engineering: drainage pipes, rubberized asphalt used for road and driveway paving, filters, soil conditioning/road coverage, porous flushing pipes, racetracks, railway crossings, traffic/sidewalk obstacles, Railroad crack joint sealant road construction and repair sea transportation, etc.
5. Production of recycled rubber: used to produce various rubber products.
Moreover, for those tires that are not very badly worn, they can be returned to the market and sold as spare tires after processing and retreading. This is why many people think that the spare tire is not easy to use. It is still different from the normal tire.
In addition to the above functions, there is a good way to use waste tires, which is to use in oil refining. The previous indigenous method of oil refining was carried out in an not environmentally friendly and unsealed environment, which caused great environmental pollution. Today, it is different. The new environmentally friendly pyrolysis oil refining equipment carries out pyrolysis and cracking reactions under sealed conditions to extract rubber oil. The rubber oil can be further purified to obtain refined oil. These oil products are very popular in the current market and the price is good.
Original page: https://www.shreddingtech.com/blog/used-tires-high-value.html
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During work, why the waste tire shredder machine meets an uneven discharge. The answer is as follows:
1. Unstable voltage will affect the stability of the motor, resulting in problems such as uneven speed, slow speed, slow speed, etc., and then worsen the uneven discharge. When the feed is uneven, the blockage is most likely to occur, causing the cavity to fill Handle unfinished materials. In severe cases, many blockages may cause downtime or high temperature of the motor.
2. The motor is not stable. When the voltage is stable, following the change of the force on the transmission, it will also cause the original fixed point of the motor to move and the base screw to loosen.
3. Shredder blades are not standard, the use of different standard blades in the same shredder will lead to uneven discharge.
Blade maintenance of tire shredder
The recycling of rubber tires has become a complete industrial chain. In the industrial chain, the tire shredder is an extremely important link. The blade plays a very important role in the tire shredder. Maintaining the ideal state of the blade will affect the tearing of the blade.
1. In the work of the tire shredder, the feeding should be made according to the manufacturer's designed production capacity of the equipment, and must not exceed the approved production.
2. The tire shredder should be overhauled regularly, check the status of the blades, and find worn blades in time to ensure that the performance of each blade is even.
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With the development of the times and the continuous progress of society, people pay more and more attention to the influence of living conditions and the environment, and at the same time, people pay more and more attention to the protection of the environment. A good living environment not only brings good mood, but also guarantees health. The improvement of living standards also makes auto industry develop rapidly.
Waste tires are growing rapidly every year, and the increasingly serious pollution has made our fragile ecological environment even worse. At the same time, tires have a limited lifespan. Discarded waste tires are insoluble or refractory materials, which have strong heat resistance and mechanical corrosion resistance, and will affect the ecological environment within a century and cause serious pollution. If this pollution is not dealt with as soon as possible, it will cause great harm to the environment, and the waste will always affect our living environment. In order to deal with this kind of garbage and reuse some of the available resources, tire shredders are produced, and the emergence of waste tire recycling line solves the problem.
The tire shredder has the characteristics of low noise, low energy consumption and high output. It fully reflects the advantages of low-speed high-torque shearing design. This series of waste tyre shredders are widely used in the recycling of large-volume wastes such as waste plastics, waste rubber, and wood. Cutting with the machine can increase the bulk density of the material and reduce shipping costs. The crushed material can be further processed by other equipment, such as material sorting, separation and cleaning. The tire shredder solves the problem of waste tires pollution.
The purpose of the double-shaft tire shredder is to reduce the size of the material by cutting, tearing and squeezing. This type of shredder is widely used in shredding waste plastic, waste rubber, wood, metal and other waste materials. However, there are many things to be aware of when using it.
1. After buying the double-shaft tyre shredder equipment, you must first read the relevant instruction manuals carefully. The operator should be familiar with the operation and maintenance methods of the double-shaft shredder, so as to avoid unnecessary accidents due to the unskilled operators.
2. Before the double shaft waste tyre shredder starting to work, check whether there is any residue in the shredding cavity. It cannot be started with a load, because starting with a load will cause electrical tripping or damage to parts, so check the inside of the shredding cavity before working. If there is any residue, remove them before starting the equipment.
3. Maintenance work is very important. Regular inspection of the wear and tear of the equipment can reduce unnecessary wear and tear caused by the long-term use of the equipment. At the same time, doing maintenance work can make the machine play a good role.
4. If there is a sudden power failure during working, turn off the power of the equipment first, so as to avoid unnecessary damage to the shredder caused by a sudden call.
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The development of tire shredder industry in China is very rapid, and it also drives the development of the scrap metal recycling industry. Among them, the development of waste tyre shredder machine is relatively rapid.
Machinery industry analysts pointed out: There are two changes in the domestic shredder machinery market in 2021:
1: From the perspective of the sales of subdivided products in the shredder machinery market, the demand in the machinery market is declining. The demand for machinery in the scrap metal industry is stable, but the demand for automated tyre recycling production lines has increased significantly.
2: From the perspective of sales time in the machinery market, buyers must first go through detailed market inspections before making product selections. Compared with the previous purchases, it seems more cautious, and it also shows that the competition in this market is becoming more and more fierce. The economic situation in the domestic market and the increasingly fierce competition is severe.
In the future, the automatic tire recycling line will become more and more common, and stand-alone tyre shredder machine may gradually be eliminated. This means the coexistence of opportunities and challenges for the entire domestic shredder machinery and equipment industry. Coupled with the fierce competition in the Chinese market, this kind of mechanical automation reform has increasingly demonstrated the trend of big waves. Therefore, The product structure of shredder machinery enterprises should be adjusted, product quality should be improved, and the technical level should be improved; the complete set of product design, production and supply of shredder machinery should also be emphasized to enhance the competitiveness of shredder machinery in the market.
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When purchasing a fruit tree branch shredder, you should choose a qualified product produced by a regular manufacturer, and choose a suitable tree branch sawdust making machine model according to actual production needs.
Attaching form to the chassis:
1.The fruit tree branch shredder with a traction site is easy to transfer, and is suitable for branch shredding operations in the field and at the work site.
2.The fruit tree branch shredder with a suspended chassis is used in conjunction with a tractor. It only has the rotary cutting function and has no smashing effect. The finished particle size is large, which is suitable for the field real-time crushing of fruit tree branches and returning to the field.
3.The fruit tree branches shredder with a fixed chassis is generally large in size, high in power, and heavy in weight, suitable for fixed locations and inconvenient to transfer.
Power type:
1.The fruit tree branches shredder with diesel engine as the power source has a relatively large size and weight, and adopts a fixed chassis, which is suitable for working at fixed location.
2.The fruit tree branch shredder that uses a motor (three-phase power) as the power source is suitable for a fixed location and a working environment with power facilities.
3.The fruit tree branches shredder that uses a gasoline engine as the power source has smaller dimensions and lighter weight. It mostly uses a traction chassis, which is less restricted by the operating site and facility conditions.
Grinding size and production efficiency:
1.The finished particle size is inversely proportional to the production efficiency. The finer the finished particle size, the lower the production efficiency.
2.Adjust the crushing particle size by selecting screens with different apertures.
3.The production efficiency is affected by the finished particle size, the amount of branches fed, and the consistency of feeding.
Maximum cutting diameter:
The maximum cutting diameter of the fruit tree branches sawdust making machine is limited by parameters such as engine power and cutter head diameter. At present, the fruit tree branch shredder with a driving power less than 15 horsepower has a maximum cutting diameter of ≤10cm, which meets the requirements for shredding fruit tree branches.
Other factors:
Technical parameters such as engine power and feeding inlet size should be considered comprehensively;
Choose the appropriate model according to the thickness of the branches and the amount of crushing capacity.
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