Cylindrical sieve introduction

Cylindrical screen cylinder made of a metal wire cloth or perforated sheet made of, the cylinder axis or slightly inclined about a horizontal axis of rotation. The cylinder is rotated by an electric motor through a chain, a gear or a friction transmission. The advantage of the cylindrical sieve is that the structure is simple, easy to maintain and manage, the work balance is reliable, and the vibration is light; the disadvantage is that the body is bulky, the screen surface is easy to wear, the power consumption is large, the processing amount per unit area is small, the screening efficiency is low, the sieve hole is easy Blockage, the effect of material crushing is large.
Cylinder screens are often used in re-election plants for washing and de-sludge, or for the classification of medium and fine-grained materials. Two or more products are available. But because it is the presence of these shortcomings, the current beneficiation plant has been rarely used, but are generally used in the construction industry to screening and cleaning gravel, sand, but some of the old factories still use such screening equipment.
At present, there are fewer manufacturers of cylindrical sieves in China, mainly Ning Mine in Fujian Province, Yankuang Mine in Jiangxi Province and Changfa Mining Machinery in Hubei Province. The specifications and technical performance of the cylinder screens produced by them are listed in the table. 1~3. In addition, Ningde Factory produces a cylindrical sieve with a diameter of 1.5m and a length of 4.0m, and a wide mine produces YTS700×400 and YTS1200×6000 cylindrical sieves.
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In recent years, Wuhuan Mine has produced a more advanced GT type drum screen. Its working principle is: through the rotation along the axis, the material is sifted and moved forward in the screen cylinder by the angle, and the material is brought into the cylinder. After falling at a certain height, it is beneficial to improve the screening efficiency. The particles remaining on the screen surface of the upper half are dropped, which can effectively prevent clogging. The technical parameters are shown in Table 4.
Features: 1 low speed and smooth rotation, high reliability, low maintenance rate and long life. Not easy to block, suitable for screening of wet materials. 2 The screen area is large, and the materials are alternately contacted, and the overall life of the screen is long. 3 low noise, fully enclosed and no dust pollution. 4 In order to further improve the performance, a high-frequency, low-intensity excitation mechanism has been developed to prevent clogging and increase the screening speed of the half-area screen to increase the yield. 5 can be set to hit the anti-blocking mechanism to further prevent blockage. 6 The cleaning mechanism can be set up, and the residual blockage is forcibly discharged before stopping. Scope of application: It is most suitable for screening coal , coke , white ash and other wet and easy to block materials. The product under sieve can be <10mm, the finest can reach ≤3mm. Suitable for the production of a variety of granular products.
Multi-stage multi-copy plate cylinder screen: The new cylinder screen is produced by Beijing Tsinghua Tiantong Technology Co., Ltd. (hereinafter referred to as Tsinghua Tiantong). The effective working area of ​​traditional cylindrical screening equipment is only 12%~17%. The material movement track is affected by factors such as the rotation speed of the drum, the angle of lifting of the material, and the inclination angle of the drum, so that the effective sizing length of the sifting is small, and the material accumulation and the thickness of the material layer are superimposed. This is the key to the low efficiency of traditional cylindrical sieve screening. The multi-stage multi-plate cylinder screen is placed horizontally, and the material advancement is completed by the partition between the guide and the stage. Therefore, the material is evenly distributed in the cylinder for the effective screening chord length in the cylinder, which increases the effective sieving area of ​​the material per unit area, and increases the effective screening working area of ​​the screen surface to 50%~60%. Therefore, the screening efficiency is improved.
The characteristics of the multi-stage multi-copy plate cylinder sieve are: 1 new structure: uniquely designed multi-stage multi-copy plate structure, which makes the traditional equal-diameter cylinder screen 40t/ at the opening ratio of 30%. The h treatment amount was increased to 120 t/h. 2 High efficiency: Compared with the effective working area of ​​the traditional cylinder screen of 12%~17%, the effective working area of ​​the screen surface is increased by 3.6 times. 3 Small wear: Due to the multi-level and multi-copy plate design, the material movement form has small friction, long service life and low maintenance cost. 4 low energy consumption: reasonable structural design, mechanical transmission loss is small, so only a small power motor is needed. 5Easy to operate: In the recovery and production of Shougang's three blast furnaces, it proves that the equipment is compact, stable, easy to operate and maintain. The hole blocking rate is low due to the mesh follower removal device. 6 Wide application: It adopts high-strength wear-resistant sieve plate, which is suitable for screening of sharp, hard and heavy materials without worrying about deformation and damage of the mesh surface.
The main technical parameters of the multi-stage multi-plate cylinder sieve are listed in Table 5. The sieve has high screening precision and can be used for screening dry materials in various fields. If used in combination with a meshless vibrating screen, it can meet the need for precise separation of large throughput and continuous production.

CNC Cutting Machine

Product introduce:

In the machining process, the common methods of sheet cutting are manual cutting, semi-automatic cutting machine cutting and CNC cutting machine cutting. Manual cutting is flexible and convenient, but the quality of manual cutting is poor, the size error is large, the material waste is large, the subsequent processing workload is large, and the labor conditions are harsh and the production efficiency is low. Among the semi-automatic cutting machines, the profiling cutting machine has better quality of cutting workpieces. Because it uses a cutting die, it is not suitable for single piece, small batch and large workpiece cutting. Although other types of semi-automatic cutting machines reduce the labor intensity of workers, they have simple functions and are only suitable for cutting parts with relatively regular shapes. Compared with manual and semi-automatic cutting methods, CNC cutting can effectively improve the efficiency and quality of plate cutting, and reduce the labor intensity of operators. With the development of the modern machinery industry, the requirements for the work efficiency and product quality of plate cutting processing have also increased at the same time, so the market potential of CNC cutting machines is still very large, and the market prospects are relatively optimistic.

cnc cutting

Working principle:
Usually, the CNC cutting system automatically processes the processed parts according to the pre-programmed processing program (the commonly used drawing software AUTOCAD). We put the machining process route of the part, process parameters, tool motion trajectory, displacement, cutting parameters (spindle revolutions, feed, back-feeding amount, etc.) and auxiliary functions (tool change, spindle forward rotation, reverse rotation, The cutting fluid is turned on and off, etc.), according to the instruction code and program format specified by the CNC cutting system, write a processing program list, and then record the content of the program list on the control medium (such as perforated paper tape, magnetic tape, disk, magnetic bubble, etc.). memory), and then input into the numerical control device of the numerical control machine tool, thereby directing the machine tool to process the parts.
This whole process from the analysis of the part drawing to the production of the control medium is called the compilation of the numerical control program. The difference between CNC cutting equipment and ordinary manual and semi-automatic cutting equipment in processing parts is that CNC cutting equipment automatically processes parts according to the program, while ordinary manual and semi-automatic cutting equipment needs to be operated by humans, we only need to change the control machine action. The program can achieve the purpose of machining different parts. Therefore, CNC cutting equipment is especially suitable for processing parts with small batches and complex shapes that require high precision!
Since the CNC cutting equipment needs to process parts according to the program, after the programmer has compiled the program, it is input into the CNC system to direct the machine tool work. Program input comes through the control medium. In this way, the CNC system is used to control the finished processing parts, and the graphics can be modified in time by the drawing staff, which can be used more freely, and the accuracy of the workpiece parts is also greatly improved compared with that of semi-automatic cutting equipment!

CNC cutting machine, flame cutting machine, oxygen cutting machine, gas cutting machine, plasma cutting machine

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