Spiral cylinder water sieve

Abstract

The screw barrel water sieve is a fine granule material sieving machine equipment, mainly is formed from internal screw sieve barrel, sand-returning barrel, mineral discharge screw, water tank, supporting mechanism, lifting mechanism, driving system, vibration device, mineral-feeding pipe and sand-returning channel. It is characterized by that the internal screw sieve barrel is obliquely mounted in water tank, said internal screw sieve barrel can be driven by driving system and rotated, and is vibrated by means of vibration device. The material to be sieve is passed through mineral-feeding pipe and hollow main shaft and fed into the internal screw sieve barrel from lower portion, said material is sieved and can be lifted. The material fallen into the water can be discharged from bottom portion of the water tank, and the material on the sieve can be discharged from upper sand-returning channel.

Description

1. Technical field: [0001] The spiral cylinder water screen is a fine-grained ore screening equipment that forms an automatic closed-circuit grinding process with a grinding machine, and belongs to the technical field of mineral screening and classification. 2. Background technology: [0002] The process of dividing fine-grained materials into several particle sizes according to the shape and geometric size is sieving. Screening is an important material preparation and production link in mineral processing, chemical industry, cement building materials and other industries. The level of efficiency directly affects the economic benefits of these industries. At present, the equipment that is widely used in the industry to form an automatic closed-circuit grinding process with the grinding machine is the spiral classifier and the hydrocyclone. This configuration has a history of more than 100 years. Fine work plays an important role, but the spiral classifier is classified acco...

AI Technical Summary

Problems solved by technology

This is because the spiral screen tube wound on the central shaft is a spiral stirring blade in appearance. When it rotates with the central shaft, it produces a strong stirring effect on the ore slurry in the tank, and the fine particles screened out from the screen tube The ore particles cannot effectively settle to the lower part of the tank, and some fine particles return to the screen from the upper sieve hole, thus reducing the screening efficiency

[0006] 2. Large power consumption

When the equipment rotates at a high speed, the spiral shape of the stirring blade produces strong agitation on the one hand, and strong resistance on the other hand, resulting in high energy consumption of the equipment

[0007] 3. The product under the sieve is seriously blocked, and the equipment is difficult to operate normally

Due to the long tank body, the coarse particles in the product under the screen are deposited, and it is difficult to discharge from the ore discharge port. In severe cases, the coarse particles accumulate until the screen tube is buried, causing serious wear and damage.

[0008] 4. The structure of the spiral screen is complex and difficult to process

If the helical tube frame is first made on the central axis, and then the screen or sieve plate is fixed on the frame, the number of sieve plates in one piece of equipment reaches 700-1,000 pieces, and 3,000-4,000 bolts are needed. Due to the existence of vibration, the equipment uses Bolts loosen during the process, ore leakage and sieve plate fall-off accidents often occur

[0009] 5. It is difficult to replace the sieve plate, and the equipment operation rate is low

Due to the following shortcomings, this equipment is difficult to apply in medium and large mineral processing plants

[0011] 1. The screening efficiency of medium and large equipment is low and can only reach 50%

This is caused by the short time for the ore to be screened. In addition, the newly fed ore is mixed into the screened ore, which reduces the screening efficiency.

[0012] 2. The vibration of the screen is weak, and the ore in the screen cylinder is difficult to loosely suspend, which affects the screening efficiency on the one hand, and on the other hand, the deposited ore wears the screen seriously

Due to structural constraints, the vibration can only be transmitted to the screen through the gantry frame-frame-supporting wheel-hollow journal-screen cylinder end cover-sand return lifting plate. Although the vibration intensity of the vibrating device is very large, the vibration already very weak

In order to make the vibration of the screen stronger, the vibration intensity of the vibration device must be very large, which in turn causes strong vibration and damage to the equipment.

[0013] 3. The lifting height of returning sand is insufficient, and it is difficult to form an automatic closed-circuit grinding process with the grinding machine

Due to the structural limitation, the ore-in and sand-returned ore-out of the equipment pass through the hollow journal of the screen cylinder. Although the returned sand is lifted away from the water surface, there is almost no height difference between the sand-returned discharge point and the ore feeding point, which is different from the grinding mill. The automatic closed circuit of the machine cannot be realized

[0014] 4. The product under the screen is seriously blocked, and the equipment is difficult to operate normally.

This kind of screening machine also adopts wet screening, the sieve hole is seriously blocked, the pressure of the ore on the screen is large, the screen is worn seriously, and the screening efficiency is not high, generally only 50% to 60%, especially under the required sieve When the particle size of the product is less than 0.5mm, it is difficult to sieve

[0016] Other screening machines such as cyclone screen, vertical cylinder screen, high-frequency fine screen, linear screen, curved screen, beating fine screen, etc., cannot form automatic closed-circuit grinding with the mill, and the wear of the screen is also very large.

[0017] Due to the deficiencies of the current known equipment, the screening and classification equipment that forms a closed-circuit grinding with the mill is still a low-efficiency spiral classifier and a hydrocyclone. Particle screening equipment has always been a hot topic in the field of material screening and classification at home and abroad.

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