Construction Hoist Safety Device
Safety is one of the most important for Construction Hoist, thus the Construction Hoist Safety Device is required. SAJ safety device is a product of BQ. When a cage over-speeds the device should act cut off the power stop the cage on mast gradually. The safety device is adjusted and sealed. Do not disassemble it. The using time limit of safety device are signed on it`s nameplate. Safety device must be delivered to the factory and inspected after it reached to time limit.
Safety device board is the connected part between safety device and other structures, it can take the impact of stopping the cage. There are installed lower speed switch, upper travel limit switch and final limit switch, once the switchs touch the relevant cam the cage will act.
We also supply other spare parts for construction hoist, such as construction hoist Mast Section, Construction Hoist Anchorage Frame, Passenger Hoist Cage, Construction Hoist Overload Protector, Sliding Contact Line, Construction Hoist Motor, Construction Hoist Reducer and so on.
SAJ Safety Device,Passenger Hoist Safety Device,Construction Hoist Overload Protector,Overload Limiter,Anti-fall Device SHEN YANG BAOQUAN BUSINESS CO., LTD , https://www.sytoplesstowercrane.com
Mining process of upward stratified filling mining method
The main mining process of the filling mining method is: mining, mining, support and filling.
(1) Falling mine. The upward horizontal stratified filling method generally adopts a gas-leg rock drill , a single machine or a double-machine mining drill to drill rock, the diameter of the drill head is 32-44 mm, and the hole depth is 2-5 m.
Generally, in ore bodies with broken ore and joints, horizontal blastholes are used for ore mining. The filling body is close to the top plate, and the ore roof is easy to control. The stratification height is generally 2.0-3.5 m, and the amount of each ore is 200-500 tons. The type of mining method, the production capacity of the stope is limited, but the operation is safe. In order to meet the requirements of the trackless equipment, in the ore body with relatively stable ore, increase the stratification height as much as possible, and use the upward blasthole to reduce the amount of collapse and increase the production capacity of the stope. Upward to the blasthole, the stratification height is 2.4-5.4m, and the drilling is used to drill rock. Each time it falls 1000-2000t, more than 5000~10000t.
(2) mining. Ore electric rake, loaders and scrapers in several ways, power rake and shipping are commonly used within the vein ore chute, Taiwan class shipping efficiency 50 ~ 100t; the earliest use of handlers is Phoenix Mountain copper mine, from Applied in the 1960s. In the late 1970s, Fankou, Hongtoushan and other mines began to use TORO-100DH, LF-4.1 and LK-1 diesel trackless scrapers for in-pulse or extra-pulse well-loading, with an average working efficiency of 150-250t. Some new mines use large scrapers, allowing the upper stratified filling method to enter the ranks of efficient mining methods. The foreign Mount Isa mine uses a large bucket of scraper, the efficiency of the shift is 580t, and the labor productivity of the miners is 130t. Electric scrapers have attracted people's attention in solving downhole ventilation, pollution and noise. They have developed rapidly in recent years and have occupied a certain proportion in underground mines in various countries. Analysis shows that compared with diesel scrapers, productivity is increased by 20 to 15%, and cost is reduced by 30 to 35%. In contrast to the stratified filling method of the North Mine of Falconbridge, the efficiency of the electric scraper is 20-60% higher than that of the diesel scraper. WJ-1.5D and WJ-76 electric scraper are applied in the point-column upward stratified filling method of Tonglushan Copper Mine. The efficiency of the shift is 100-200t. Try our gold mines and the promotion of small bucket capacity of electric scrapers, all achieved good results.
(3) Stope support. Upward and horizontal stratification, personnel and equipment work under the roof. As the size of the ore increases, the height of the stratification increases, and the roof or surrounding rock must be reinforced and supported, even if the roof is better. Preventive support measures.
China generally adopts metal anchors such as pipe-seam, wedge-slit, and expansion-shell type. The length of the rod is 1.5-2.3m, the bolt mesh is 0.8×0.8-1.5×1.5m, and the anchoring force is more than 5~10t. The Fenghuangshan and Tonglushan mines with point-column upward stratified filling method, in addition to the retaining point column and the inter-column to strengthen the supporting capacity of the roof, and promote the long anchor cable plus short anchor and metal mesh joint support , effectively support the top plate. Long anchor cable netness 2.5×2.5～4×4m, aperture 60mm, anchor cable diameter 22～24.5mm, anchor cable length 13～16m, grouting with mortar pump or grouting machine, anchoring 4~5 layers at a time, The anchoring force is 14.5t. Fankou lead zinc ore using Pluton-17 type anchor trolley. The calibration shift can anchor 60 to 80 anchors and use the service trolley to treat the top stone.
(4) Filling. The dry filling is filled with quarry or excavated waste rock, and the paddock is transported by electric shovel or scraper. The concrete surface is poured with a concrete pavement of about 0.2m thick to facilitate the operation of the equipment and reduce the loss of the mining ore. The cement consumption is 200-300kg/m 3 . Tailings (water sand) is filled, the filling capacity h 40 ~ 80m 3 lime sand filling body surface ratio of 1: 4 to 1: 5 surfacing mortar, having a thickness of 0.3 ~ 0.5m. Persons and equipment can enter the stope operation 24 to 36 hours after filling. Individual mines do not make cemented pavements, and secondary loss and depletion of ore increases.
When the two steps are taken back, the mine is filled with cement to create conditions for the two-step mining column. The cement is filled with cement, such as tailings, fine stones and block stones. The filling body number ranges from a few megapascals to 2 to 5 MPa. The low-grade cement mortar has a ratio of lime to sand of 1:8 to 1:10 and a concentration of 65 to 70%. The Jinchuan No. 2 Mining Area has realized high-concentration self-flowing pipeline transportation and achieved good results. The ratio of foreign tailings cemented filling sand and sand can reach about 1:20~1:30.
Filling dehydration has two ways or a combination of osmotic dehydration and overflow dehydration. The overflow dewatering facility is divided into an overflow filtering water partition wall and an overflow filtering water well. Figure 1 shows the overflow drainage wall. An overflow port is left in the access partition wall, and as the filling slurry rises, the clean water flows out from the overflow port. In the partition wall, the board is nailed with a water filter material such as burlap to facilitate water filtration.
Figure 1 Overflow dewatering partition
1- overflow port (and personnel entrance and exit); 2-column 150×150mm square wood;
3-thick 3cm plank; 4-150×150mm square beam
Permeation dehydration generally buryes porous horizontal pipelines in the floor of the stope as a permanent water filtration facility connected to the drainage wells; there is a gap of 10 to 50 mm between the well frames of the pedestrian filtration wells, and the frame is surrounded by metal mesh, linen or polyethylene weaving. Water filtering material, and the steel tube filtering well is about 1m in diameter, the steel wall has a filtering hole, and the outer layer is wrapped with linen. The Fenghuangshan copper mine uses water-conducting concrete filtering wells, and the filtering water well wall is pre-buried into the wooden water filtering window (800×200mm), with 4 to 6 windows per layer, and the drainage effect is better.
In the large long stope, a water filter tower is arranged between or around the water filtering wells. The water filtering tower is a steel cylinder or a metal mesh braided into a cylinder having a diameter of 0.5 m, and is wrapped with a water filtering material. The drain pipe is connected to the filter well and is very effective for filling and dewatering.
The determination of the parameters of the stratified filling barrier wall, the Soviet Union JI.A. Kaposnik et al. compiled a nomogram for calculating the structural retaining wall parameters based on indoor and on-site research (Fig. 2). When the filling composition and filling height are given, the pressure and the distance between the columns required for a certain thickness of the board can be found.
Figure 2 Nomogram of the parameters of the wooden retaining wall
The distance between the L-retaining wall columns; the height of the H-filled filler; the pressure of the P-filled retaining wall;
P-filler density; Q-filler water content
The wind filling is filled with compressed air conveying or filling machine. The stope does not need to be dehydrated, and the filling body has high strength, but the power consumption is high.
(5) Ventilation. The ventilation of the stope is through the ventilation of the wind flow. The fresh air flow enters the working surface by the pedestrian or ramp, and the return air (or the filling) returns to the wind. The general stope consists of two inlet wells, one return air well, and two large return exits.
The minimum working speed of the underground working face is 0.25m/s, and the required air volume is generally 0.85m 3 /min per person. The use of diesel trackless equipment puts forward higher requirements for downhole ventilation and exhaust gas purification. Recommended claim foreign air volume of 3.7 to 4.7 m 3 / min * kW, waste of a predetermined allowable concentration CO30mg / m 3, NO x 8mg / m 3, the dust concentration of 2mg / m 3. The upward stratified filling method of No. 4 ore body of Fankou Lead-Zinc Mine, the determination of harmful gas content within the allowable range, the wind speed of the stope reaches 0.25-0.3m/s, which can fully meet the requirements of exhaust gas dilution. Large tea uranium NO x and CO contents were 4.79mg / m 3 and 3.55mg / m 3, to reach the allowable range, but the yield of dust and radon not fully meet the standard. This indicates that the mining of uranium mines can meet the specified standards for the dilution and purification of diesel waste as long as the ventilation requirements of helium are met.