According to the structure and working principle of the screening machine, there are roughly the following categories:

(1) The working part of the fixed screen is fixed and the material is screened by sliding the material along the working surface. Fixed grid screen is more apply a beneficiation plant, generally used for pre-screening before the rough broken or crushed. It is simple in structure and easy to manufacture. It does not consume power and can directly discharge the ore to the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.

(2) The roller screen working surface is composed of a horizontally arranged rolling shaft with a plate on the shaft, and the fine material passes through the gap between the rollers or the plates. The bulk material is moved by the roller to one end and discharged from the end. Such sieves are rarely used in concentrators.

(3) The working part of the cylindrical sieve is cylindrical, and the whole sieve rotates around the axis of the cylinder, and the axis is generally installed with a small inclination angle. The material is fed from one end of the cylinder, the fine grade material is passed through the screen opening of the cylindrical working surface, and the coarse material is discharged from the other end of the cylinder.

The rotary screen has a low rotation speed, stable operation and good dynamic balance. However, the mesh hole is easy to block, the screening efficiency is low, the working area is small, and the productivity is low. The concentrator rarely uses it for screening equipment .

(4) The plane motion sieve body is a plane that oscillates or vibrates. According to its plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Shaking screens and vibrating screens fall into this category.

The rocking screen is a crank connecting rod mechanism as a transmission component. The motor drives the eccentric shaft to rotate through the belt and the pulley, and the connecting rod reciprocates the body in a certain direction. The moving direction of the body is perpendicular to the center line of the pole or the suspension rod. Due to the swinging motion of the body, the material on the screen surface moves to the discharge end at a certain speed, and the material is simultaneously sieved.

The shaking screen has higher productivity and screening efficiency than the above sieves. The disadvantage is that the power balance is poor. It is now rarely used by concentrators and replaced by vibrating screens with more reasonable structures.

It is most widely used in concentrating plants. According to its different transmission mechanisms, it can be divided into the following types: eccentric vibrating screen, inertial vibrating screen, self-centering vibrating screen, and resonant screen.

Stainless Steel Coil Tube

Stainless Steel Coiled Tubing

Used for a variety of circulation systems for different gases and fluids, coil tubes provide the ability for long length tube installations without the need for joining fittings. PAC Stainless stocks both welded and seamless coil tubes and can provide them in long mill lengths or cut-to-length in sections as short as fifty feet. These products have industry applicability for petrochemical, oil production heat tracing, geothermal and flow measurement applications.

Size Range
Outside Diameter: 1/16" through 3/4"
Wall Thickness: 0.010" through 0.083"

Seamless Tubing
Production Specifications – ASTM A213 (average wall) and ASTM A269

Chemical Composition (%)









18.0 – 20.0

8.0 – 12.0

0.03 (max)


1.0 (max)

0.045 (max)

.030 (max


16.0 – 18.0

10.0 – 14.0

0.03 (max)

2.0 – 3.0

1.0 (max)

0.045 (max)

.030 (max)

Stainless Steel Coil Tube,Stainless Steel Cooling Coil Tube,Stainless Steel Heating Coil Tube,Stainless Steel Long Coil Tube

Zhejiang Max Stainless Steel Co.,Ltd ,