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When do roll crushers need to change roll skins?
2025-05-12When do roll crushers need to change roll skins? Roller skin, as the main accessory of roller crusher, the time of replacing the roller skin, according to the degree of wear and tear, equipment operating status and production effect of comprehensive judgement, the following are the main judgement criteria and influencing factors: Wear depth of roll skin When the wear depth of roll skin surface exceeds 3-5mm or serious cracks or damages occur, it should be replaced immediately. Thickness ratio Wear amount reaches 20%-30% of the original thickness should be replaced, and the remaining thickness of the roll skin should be scrapped when it is less than 30mm. Deterioration of material quality of Roll Crusher Uneven granularity of finished products, fineness percentage is lower than 70% (normal is more than 92%). The appearance of a large number of dust or super-grain phenomenon, indicating that the roller skin has been unable to effectively crush the material. Reduced production capacity The crushing efficiency of the equipment decreases significantly, and the output per unit time is reduced. Abnormal operation Uneven wear of roller skins will lead to increased vibration of the equipment, accompanied by abnormal noise. The friction resistance of the crushing process…
Is the roll crusher resistant to wear and tear？
2025-05-11Is the roll crusher resistant to wear and tear？Wear and tear of roll crusher mainly comes from three aspects: nature of material, equipment factors and operation mode. The hardness, humidity and particle size of the material are the main factors affecting wear. For example, materials with higher hardness have a more significant effect on the wear of the equipment. Equipment factors include roll material, structure and design. If the roll material is not properly selected or the structure is not reasonably designed, the wear process will be accelerated. Operation methods such as feeding speed and load size will also affect the wear situation. Wear prevention measures for roll crushers: The rollers are made of high chromium alloy, high manganese steel or special alloy materials to improve the anti-wear performance. For high hardness materials such as river pebbles, increase the thickness of the roll surface or use wear-resistant coating technology (such as spraying tungsten carbide). Improvement of structural design. Reduce the friction by optimising the shape of the roll surface (such as spiral teeth, grooved teeth). Adjusting the roller gap to a reasonable range (usually 0.1-5mm), and adopting the differential speed design to make the two rolls rotate at different speeds. …
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Roller Sand Making Machine Finished Product Rate Advantage
2025-05-09Roller sand making machine has the following advantages compared with vertical shaft impactor in terms of finished product rate: 1. Higher and stable yield of roll sand making machine The product yield of Roller Sand Making Machine is usually close to 100%, especially after plastic crushing, there is almost no material waste. Its double-roll extrusion design reduces ineffective crushing and over-crushing by precisely controlling the material crushing process. The yield of vertical shaft impact crusher is greatly affected by the hardness of raw materials and the performance of the equipment, which is generally 60%-85%, and may even be as low as 30%-40% when dealing with hard rocks (e.g. basalt). 2. Lower energy consumption and operating costs Roller sand making machine has a simple structure, less energy loss in the crushing process, and the power consumption and operation cost per unit of product are significantly lower than that of vertical shaft impact crusher (estimated operation cost is 1-2 USD/tonne, while that of vertical shaft impact crusher is 2-3 USD/tonne). Vertical shaft impact crusher needs supporting vibrating screen, elevator and other equipment, the system is complex and high energy consumption. 3. Strong adaptability and low maintenance cost Roller sand making machine can…
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Roll Crusher Replacement Roll Skin Process
2025-05-08Roller crusher roll skin replacement needs to pay attention to the following key matters to ensure operational safety and normal operation of the equipment: 1. Safety Preparation and Power Disconnection Measures Cut off the power supply Before replacement, the power supply of the crusher must be cut off, and if necessary, the main power supply must be disconnected, and the warning sign of ‘Maintenance’ must be hung in a conspicuous position. Unloading and cleaning Before operation, it is necessary to depressurise the equipment, clean the pumice at the head of the belt, and dismantle the protective cover and cover plate, so as to avoid interference with the operation by residual materials. 2.Disassembly and Installation Specifications Old roller skin treatment If it is difficult to remove the old roll skins from the roll crusher, cut them with gas welding and clean the surface of the unit thoroughly to ensure that no residue interferes with the installation of the new roll skins. 3. Operation and commissioning process Lifting and commanding When lifting the roller skin, it needs to be commanded by a person, strictly follow the lifting procedure and avoid collision or tilting. No-load test After the replacement is completed, the machine…
The Method Of Adjusting The Discharge Size Of Roller Crusher:
2025-05-07The adjustment of the discharge size of roller crusher is mainly realised by adjusting the roller gap, equipment parameters and maintenance management as follows: Wedge device adjustment The position of the wedge is controlled by adjusting bolts: When the wedge is pulled upwards, the gap between the movable roller and the fixed roller increases, and the grain size of the discharged material becomes coarse. When the wedge is pressed downwards, the spring pressure reduces the gap, and the grain size of the discharged material becomes finer. Gasket device adjustment Increase the number or thickness of shims, the gap between the two rollers increases, and the granularity of the discharged material becomes coarse. Decrease the number or thickness of shims, the gap decreases, and the granularity of the discharged material becomes fine. Adjustment of hydraulic system of fully hydraulic roll crusher The roller gap is controlled by hydraulic pressure: Increasing the pressure reduces the gap and results in finer grain size. Decreasing the pressure increases the gap, resulting in a coarser grain size. Optimisation of machine parameters to adjust the discharge size Adjustment of roller speed The higher the rotational speed, the shorter the material residence time, the coarser the discharging…
When Installing A Double Roller Crusher, Why Must It Be Allowed To Run The Machine Empty？
2023-07-25There are countless double roller crusher manufacturers on the market currently. Therefore, we should choose the excellent equipment manufacturers. The machines produce by professional manufacturers features long service life, which can prove the satisfaction of customers and earn a higher income for them. There are a lot of friends who buy crushers do not know why the double roller crusher must run empty when it is first installed? Here is a brief chat for you, I hope to help friends who buy sand making machine. The double roller crusher needs to run for a while to make the machine lubricant sufficiently before it begins to work, which minimizes wear and tear on the machine. In addition, machine-testing in advance can also detect the equipment. If the machine is faulty, shut down the machine in time to repair the abnormality. Furthermore, when the machine is running empty, we can effectively find out if there is any abnormality in the equipment, and check out if the machine is installed correctly. If there is a problem with the installation of the machine, we need to find out the problem and re-install it. If the empty machine runs normally, we can add a small amount of material to test the machine again.
How Is The Performance Of Double Roller Crusher? How Much Is Exw Price Of Double Roller Crusher?
2023-07-25Double roller crusher, also called double roller sand making machine, is mainly used for fine sand-making. There are many sand plants to pick it as a crushing machine for its outstanding advantages in recent years. It is capable of handling both dry and wet materials, and performs well in handling more than two hundred kinds of materials including pebbles, river pebbles, quartzite, steel slag, glass, and so on. Double roller crusher also operates well in sand-making with adjustable discharge size. When the size of feeding material is less than 8cm and the discharge size is less than 5mm, the finished product rate can reach about 90%. The wear parts of the double roller crusher are also very durable with the long service time for more than 1 year. And if the feeding materials is soft, its service time even reaches to three years without replacement. Furthermore, the double roller crusher has also been improved in recent years. Compared with the previous manual spring double roller crusher, the new large-size double roller crusher are equipped with direct-connected drive structure, semi-automatic and fully automatic hydraulic equipment, which greatly optimizes the productivity of the double roller crusher. Different manufacturers produce double roller crushers of different quality with different accessories. When it comes to the price, such as small double roller crusher 2PG400*250, with production capacity of 2-10 tons per hour, its price is generally more…
What Materials Are Suitable For Crushing By Double Roller Crusher?
2023-07-25Double roller crusher makes up for the lack of natural sand. Double roller crusher, as a great tool of sand-making, is highly favored by our customers. Many directors set up sand plants would like to purchase the double roller crusher for its convenient operation, less wearing parts and the adjustable discharge size. Double roller crusher is widely used in all walks of life due to its strengths. However, there exists many people who wonder what materials are suitable for crushing by double roller crusher? Then, let’s talk about this question now! Double roller crusher is suitable for crushing solid and medium or fine materials with compressive strength less than 250Mpa and water less than 35%, such as river pebbles, pebbles, iron ore, quartzite, potassium feldspar, sodium feldspar, limestone, silicon, barite, basalt, granite, steel slag, cement clinker, construction waste concrete), shale, quicklime, coal, coke, clay, bentonite, chemical raw materials and so on. With the adjustable gap between the two rolls of the double roller crusher, the discharge size can be adjusted to meet the customers’ various production needs, which earns more popularity than other crusher equipments. The gap between the two rolls of the double roller crusher can be adjusted flexibly. When the size of feeding material is less than 8cm and the discharge size less than 5mm, 3mm, 1mm, the finished…
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[Warranty]How Long Is The Warranty Of The Roller Sand Making Machine? Are You Responsible For Installation?
2023-07-05The roller sand making machine is guaranteed for one year. We are responsible for guiding the installation. When your equipment meets the startup conditions, we will arrange technical personnel to guide debugging and installation, and train your operators how to use the equipment correctly.
[Welcome To Visit]What Is The Effect Of The Double Roller Sand Making Machine?
2023-07-05The output of roller sand making machine has full grain size and conforming to China Construction Construction Sand Standards.
[How To Choose]What Problems Should Pay Attention To When Choose The Roller Sand Making Machine?
2023-07-05A: Choose the roll sand machine first of all to choose a large factory, professional factory, see their market share is not high, because who the higher the market share of the corresponding higher technical content, because the more customers respond to the proposal and improve the quality of the higher the chances, and then see whether the manufacturers supporting accessories are big manufacturers of brand-name products, as long as the supporting manufacturers are big manufacturers, equipment prices are high also worth buying, usually said a price A point of goods! is the law of the millennium! Like our Huashengming used reducer for Jiangsu Guomao, Tyrone’s hardened gear reducer, large shaft 40 chromium calcined parts, roller skin using manganese 18 chromium 2 material centrifugal casting method of casting spare parts, high density of material, wear-resistant and durable! Lifetime warranty for the hydraulic system! Buy with confidence!
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[Advantage]What Are The Advantages Of Your Roller Sand Making Machine?
2023-07-051,easy to operation 2,adjustable discharge 3,more durable and patented material of roller skin 4,high capacity,low cost 5,good performance,low over-crushing rate
