Industrial Application of YZS Raw Mine Vibration Bar Screen

The YZS raw ore vibrating screen adopts dual vibration motors for self synchronous directional micro vibration. In order to simplify the structure and reduce the vibration weight of the equipment, the main working mechanism is divided into two parts: the vibrating screen strip and the fixed deflection strip. During operation, only the vibrating screen strip part participates in vibration; The fixed sieve strip is welded to the foundation beam and does not participate in vibration.

The length and width of the equipment are compatible with the production capacity requirements and the size of the chute. In order to increase the screening rate and the conveying effect of bulk raw ore, the width between the screening strips varies, with a receiving end width of 470mm and a unloading end width of 550mm. The inclination angle of the screening surface is 12 °, and the installation angle of the fixed screening strips is 17 °. The technical features of YZS vibrating screen are as follows:

Processing capacity (tons/hour):>1400;
Vibration frequency (Hz): 24.7;
Amplitude (mm): 0.5-2;
Excitation force (kN): 10 x 2
Invitation angle (degrees): 25;
Power (kW): 1.5 x 2;
Bar screen length (mm): 4600;
Screen width (mm): 2200;
Screen bar width (mm): 470-550;
Weight (kg): 1160

Installation position of YZS raw ore vibrating screen.

In order to change the current backward state of low mining efficiency and poor operating conditions in the mining area, we conducted research on the continuous operation system of mining transportation. In March 1990, we built a mining area transportation continuous operation line at Tongling Shizishan Copper Mine, which consists of newly developed JZC light combined vibration mining machine, YZY mobile segmented vibration transportation train, and YZS raw ore vibration screen, And successfully conducted industrial experiments on continuous mining and transportation operations.

The process flow of the continuous operation line for ore extraction and transportation in this mining site is as follows: the ore in the mining site is placed into a mobile segmented vibration transportation train (2) through a light combined vibration conveyor (1) with a large opening. The vibration transportation train continuously transports the ore to the original ore vibration strip (3) of the 3 # -1 pass (4) in the mining site. Unqualified large blocks are screened through the vibration strip screen and directly transported to a dedicated secondary crushing chamber (6), while the screened ore directly enters the pass (4), Reach the main transportation level in the lower and middle sections. The characteristic of this continuous operation line is that the collapsed ore is directly discharged from the mining site by a vibrating ore extractor with a large opening, and is screened through a vibrating bar screen during the continuous transportation process. The mining process is uninterrupted, achieving continuous operation of mining and transportation in the mining site, and greatly improving the production capacity of the mining site.

3、 Industrial experiments and result analysis

The YZS raw ore vibrating screen was installed according to the overall plan in March 1990, followed by industrial trial mining. During the continuous mining transportation test, a comprehensive inspection and main parameter testing were conducted on the vibrating screen. The industrial application test results show that the YZS raw ore vibrating bar screen has achieved the expected process effect and requirements of the design.

Although this industrial application experiment has achieved the expected results, there are several points that need to be explained regarding the experimental situation and results:

1. Due to the minimum production capacity of the mining area 3 # -1 (only nearly 300 tons at full capacity), the production capacity of this continuous mining system is very large (determined by the Mechanical Product Quality Supervision and Testing Center of China Nonferrous Metals Corporation to be 1039.19 tons/hour). The transportation equipment at the lower transportation level is not compatible with the large production capacity of the continuous mining system, which limits the continuous start-up time. Therefore, during the experimental mining period, there were no consecutive shifts for mining, and even if there was one shift per day for mining, the pure start-up mining time of the shift was very small. Therefore, the production capacity of the shift during the industrial test did not reach the maximum production capacity. Furthermore, during the continuous ore extraction process, the actual start-up and operation time of the vibrating screen is very short (see Table 1), indicating that there is still a large surplus in the screening and processing capacity of the screen, which can fully meet the requirements of larger production capacity for continuous transportation.

2. The yield of large blocks refers to the actual statistical number of large blocks on the screen surface after being screened by a vibrating bar screen. Some unqualified block sized ores are fed by the vibrating transport train to the vibrating bar screen. Due to a large drop (about 1.2 meters) when the ore is continuously transported, it collides with each other, and the vibration of the vibrating bar screen causes some large ore blocks to be broken. Therefore, the output rate of the large ore blocks listed in the table is slightly lower than the output rate of the large ore blocks in the mining area.

3. Due to the uneven lower edge of the original concrete partition wall and the failure to meet the design requirements for the effective height of the screen surface, it hinders the smooth transportation of individual large blocks on the screen surface (such as the third dimension of one of the large blocks being released, which is 1.55 x 1.05 0.65 meters and weighs approximately 30 tons) to the secondary crushing.

4. The installation angle of the screen surface (12 °) is slightly smaller. If the angle is increased by a few degrees, it will be more conducive to the transportation of large blocks on the screen surface. However, the installation angle should not be too large, and both the screen penetration rate and the bulk conveying effect should be taken into account.

The YZS vibrating screen adopts dual YZS vibration motors for self synchronous excitation,, which not only simplifies the structure of the screen, but also makes the screen vibrate in a directional manner, improving the comprehensive effect of screening and conveying large blocks. The equipment is easy to process and manufacture, easy to operate and use, and has low cost and operating expenses. It can be used in conjunction with all the transportation equipment for mining in the mining area, with wide adaptability, significant social and economic benefits, and great promotion and use value. The vibration motor used on the YZS raw ore vibrating screen was later referred to as the YZS vibration motor.