The main links of the mining process: perforation, blasting, mining and working surface transportation. The direction of advancement of the working face is parallel propulsion, vertical strike (also known as lateral mining) or oblique propulsion according to the conditions and quality requirements of the deposit. The height of the step is usually 15m or higher. The depression is usually 12m, the length of the shovel working line is 50-100m, and the perforation of limestone mine currently uses more than 90% of YQ-150 and KQ-150 down-the-hole drilling rigs . However, due to its slow drilling speed, it has become the object of reform. The new mine began to use the domestic KQX-120A full hydraulic cutting down-hole drilling rig . When the ore firmness coefficient is less than 10 and the content of free SiO2 in the ore is low, the efficiency of this drilling rig is 80-100m, and KQ is used. The -150 type down-the-hole impact drill is generally only 30m. Roller drills KY-150 and KY-250 are also being promoted. DTH drilling itself is also developing towards medium and high wind pressure. Domestically produced KQG-100 and KQG-150 high-pressure submerged hole drills, some large mines use imported perforating equipment, such as Jidong, Ningguo, Liuzhou and other plants with German HBM. -120 rig, Anhui Tongling hydraulic drilling rig Sweden. In blasting, the differential blasting of double-row or multi-row medium-deep holes of ammonium nitrate explosives is commonly used. Due to the KQX-120A drilling rig, the diameter of the blasthole is reduced to 120mm, and some corresponding changes should be made in the blasting. The multi-row hole blasting with wide hole spacing and small resistance line is used, and the mining work is mainly carried out by single bucket. Therefore, in recent years, hydraulic excavators with low energy consumption and high efficiency have been used. As the tonnage of automobiles increases, the bucket volume also increases. The 1m3 excavator has been eliminated in large and medium-sized cement mines. Generally, excavators with a capacity of 2m3 and 4m3 are used, and 4m3 is used more. The trend should be to use a hydraulic excavator. Working face transport large and medium-sized mines all use dump trucks. Packed with medicinal domestic drug carts or mixed drug carts. The site is cleaned, leveled and transported with high-powered bulldozers. The original 73.6kW bulldozer has been replaced by a 154.6kW bulldozer. The front-loading machine uses a ZL-50 bulldozer with a bucket volume of 3m3 and a power of 154.6kW.
May be the cabinet of aluminium alloy used for manufacturing later, people developed the push-pull cabinet.Push-pull cabinet did not stop the problem, because of push-pull cabinet casement opening and closing of stationary state basic same.
One disadvantage of push-pull cabinet is a must have at least one fixed fan, greatly reduce the cabinet area: the other is a fatal weakness could not meet the requirements of air tightness and water tightness.
Of push-pull cabinet casement fixed point is up and down two guide rail, so the wind pressure strength is limited.Modern building more and more high to the requirement of energy conservation and other functions, the sealing of the cabinet, sound insulation and heat insulation, air tightness and water tightness and wind resistance strength and security level, there are strict requirements.To meet the requirements of a variety of integrated and produced within the batter casement cabinets, or the Europe type cabinet.
The cabinet of modern glass curtain wall building model related to the cabinet frame on the wall of the fixed way.Because the glass curtain wall of air tightness, water tightness and wind resistance strength of the demand is higher, on the curtain wall cabinet accessories, according to the need to develop relatively independent.
Modern architecture of the cabinet is not confined to the level of manpower and starting from the requirements of ventilation heat removal, the height of the cabinet is an important factor decided to take a breath row of thermal efficiency, so people invented all kinds of cabinet.
Cabinet Hardware,Zinc Die Casting Cabinet Handle,Zinc Die Casting Cabinet Switch,Coated Cabinet Hardware
NINGBO ZHENHAI BOLANG METAL PRODUCT FACTORY , https://www.diecastingdie.com