Technical transformation of a gold mine mixed well lifting system

Mix well Xincheng gold mine hoisting system put into operation in 1995, the mine has been mined deep part, due to the decline in ore grades, ore production must be increased in order to meet the company's gold production requirements, but to enhance the ability to mix well has restricted the development of the mine. In order to improve the shaft lifting capacity as much as possible, the shaft lifting system is implemented without major modifications.
Capacity expansion and transformation, through multi-program technology comparison and demonstration, to ensure the successful completion of the transformation [1].
1 mixed well lifting system status
The mixing well lifting system originally used a 6.3m3 bottom-loading bucket with a tank lifting method. In order to meet the production requirements for capacity expansion, the first expansion expansion was carried out in 2009. Under the premise of ensuring the safety and reliability of the lifting system, the arrangement of the wellbore section was not changed, the tank hammer was replaced, and the over-winding height of the well and the well was adjusted. , the hardened wellbore equipment was reinforced. After the transformation, the 7.7m3 bottom dump bucket with tank hammer lifting method, JKMD-2.8Ã—4(I)E floor type multi-rope friction wheel hoist, GZ181-5 type motor, power 800kW; Self-weight 13.5t, effective load 12t, tank hammer weight 19.5t; lifting rope adopts 6VÃ—34+FC type, diameter 28mm, a total of 4, balance tail rope adopts 34Ã—7+FC type, diameter 40mm, total 2 Root, the safety factor of the first rope is 7.88 when lifting, 10.27 when lifting, the maximum static tension is 315.369kN, the maximum static tension is 59.069kN, and the lifting speed is 7.52m/s. The daily calculation is increased by 19.5h, and the lifting amount is about 3595t/d.
2 upgrade system transformation plan
Shaft lifting capacity is the comprehensive ability of the system, which is reflected in the coordination and matching of the capabilities of various equipment in the system. Considering the design of each equipment has a certain margin, through analysis and calculation, find out the key influencing factors [2], and propose two transformation schemes to achieve the purpose of capacity expansion.
2.1 Analysis of the transformation plan
2.1.1 Option 1
(1) The cross section of the bucket is unchanged, the bucket body is lengthened by 0.9m, the bucket receiving port is increased by 0.1m, and the bucket volume is increased from 7.7m3 to 9.3m3. The weight of the bucket is 13.9t, and the effective lifting amount is 14t. Maintain the original cage unchanged, increase the weight in the cage, and control the cage weight to 20.9t.
(2) The ground mine bin and the unloading straight rail are not modified, and the corresponding parking space wedge-shaped tank road is adjusted. The derrick anti-collision beam is moved up by 0.9m, and the wedge-shaped tank path is moved up by 0.9m to meet the requirements of the over-winding length in the safety regulations. Due to the excess length of the downhole roll, it is only necessary to adjust the installation height of the wedge can.
(3) In order to meet the requirements of the original hoist for maximum static tension, tension difference and steel rope safety factor, this transformation uses imported rope. After the transformation, it will only be upgraded as the main well, and no longer undertake tasks such as personnel and materials.
(4) The original bucket measuring device can not meet the needs after the expansion of the bucket. Please ask the equipment manufacturer to design the new equipment according to the original measuring chamber and the installation size of the measuring device.
(5) The actual maximum static tension and tension difference of the system are closer to the allowable value of the hoist. The working life of the hoist is longer. It is recommended to replace the hoist main shaft and the balance wheel. Due to the change in the height of the lift, local adjustment of the electronic control system is required.
(6) After calculation, the force of the derrick, the wellbore tank and the tank beam meet the transformation requirements, and no redesign is needed.
2.1.2 Scheme 2
(1) The cross section of the bucket is unchanged, the bucket body is lengthened by 0.9m, the bucket receiving port is increased by 0.1m, the bucket volume of 7.7m3 is increased to 9.3m3, and the effective lifting amount of the bucket is 14t. In order to meet the safe operation of the system, it is necessary to ensure that the force-receiving part has both the strength of use and sufficient rigidity in the design and reconstruction of the bucket [3]. The partial structure of the bucket is optimized. The adjustment part is not affected by the thickness of the stiffener plate and the specifications of the roller can, and the new NM360 material is used as the liner to reduce the thickness of the liner from the original 12mm to 8mm. The weight of the bucket is controlled below 12.5t. Maintain the original can
The cage is unchanged, the weight in the cage is increased, and the total weight of the cage is 19.5t.

(2) The ground mine bin and the unloading straight rail are not changed, and the corresponding parking space wedge-shaped tank path is adjusted. The derrick anti-collision beam is moved up by 900mm, while the wedge-shaped tank path is moved up by 900mm. Meet the requirements for over-winding length in safety procedures. Due to the excess length of the downhole roll, it is only necessary to adjust the installation height of the wedge can.
(3) In order to meet the requirements of the original hoist for maximum static tension, tension difference and steel rope safety factor, this transformation uses imported rope. At the same time, replace the heavy tail rope, from the original îžˆ40mm to îžˆ38mm.
(4) The original bucket and metering device can no longer meet the needs of the expansion of the bucket. The equipment manufacturer is required to design and manufacture the new equipment according to the original measuring chamber and the installation size of the metering device.
(5) The hoist and motor are unchanged. Due to the local variation of the lifting height and speed map, the electronic control system needs to be partially adjusted. After the lifting system is adjusted, the overload factor of the motor is increased from 1.37 to 1.41, which can meet the use after the transformation.
(6) In view of the fact that the lifting well is the main transportation transportation system for the mine production system, the actual calculated power of the motor after this transformation is 733 kW [4], which is close to the rated power of the motor 800 kW, and the main motor and the rectifier transformer are inspected and spared.
(7) In order to reduce the time and daily maintenance time of this transformation and improve the utilization rate of equipment, a vertical shaft friction wheel is added to the derrick to lift the first rope lifting device and the rope holder (depending on the installation space and force of the derrick).
(8) After calculation, the derrick, wellbore tank and tank beam are all subjected to the transformation requirements and do not need to be redesigned.
2.2 Scheme comparison
See Table 1 for comparison of technical parameters of the mixing well lifting system transformation plan.

It can be seen from Table 1 that the investment in the first scheme is large, and the replacement period of the hoisting machine spindle and the motor is long, and the effect is slow. The well is the main production upgrading well of the mine, and the suspension of production will inevitably affect the production of the whole mine. In the case of the same increase in production capacity, the length of the renovation period is an important basis for the comparison of the two options. Therefore, the recommended scheme is the transformation plan.
3 implementation of safeguards and issues that should be noted
1 According to requirements, the equipment (including hydraulic brake system, foundation force, etc.) is designed and manufactured according to the maximum static tension of steel wire rope 335kN, the maximum static tension difference of steel wire rope is 95kN; 2 equipment basis is according to the force parameters provided by the equipment manufacturer Designed to meet the needs of the transformation; 3 derrick does not need to be reinforced; 4 to meet the requirements of the anti-skid coefficient, the design requires replacement of the hoist drum and the friction pad of the sky wheel, the pad type is K25 (imported material domestic production) 5 When ordering the wire rope, the rope core is required to be injected with N113 grease; 6 requires the hoist to perform a comprehensive overhaul before the expansion, adjust the coaxiality and parallelism of the spindle device, detect the bearing clearance, and replace the standard in time, pay attention to monitoring The anchor bolts of the bearing housing are replaced if they are loose [5].
4 technical transformation implementation effect
After the transformation of the mine mixing well lifting system is completed, the lifting system is operating normally. The lifting capacity reached 4019t/d, and the improvement was greatly improved, which relieved the pressure of the mine and achieved good results.
5 Conclusion
(1) The transformation of mine hoisting system is a systematic project. It is necessary to combine the actual production of the mine itself, carry out multi-program comparison and technical demonstration to ensure the maximum benefit.
(2) Do a good job in the organization of the implementation of the technical transformation plan, unified command, clear division of labor, reasonable arrangements, and minimize the downtime.
(3) The selection of lifting system equipment should consider the long-term development plan of the mine. Under the conditions of economic capability, try to get one-stop in one step to avoid unnecessary losses caused by technological transformation.
references
[1] Jia Meng. Transformation Longgu coal mine shaft hoisting system [J]. Coal Mine Machinery, 2003 (9): 101-102.
[2] Zhao Xiaofeng, Chen Xiaofei, Wang Xiaodong. Production shaft lifting system transformation optimization program [J]. Gold, 2012, 33 (6): 36-40.
[3] Zhang Ronghui. Reconstruction of the main well light bucket [J]. Shandong Coal Science and Technology, 2001 (2): 12-13.
[4] Zhang Menglin. Mining Design Manual: Mining Machinery Volume [M]. Beijing: China Building Industry Press, 1989.
[5] Liu Jinpeng, Liu Wanqiang, Li Dingkun, et al. Rationalization of the shaft lifting system of Jintingling Gold Mine [J]. Gold Science and Technology, 2010, 18 (4): 80-81.
Author: Xincheng Gold Mine mixing shaft hoisting system was completed in 1995 and put into production, the mine has been mined deep part, due to the decline in ore grades, ore production must be increased in order to meet the company's gold production requirements, but to enhance the ability to mix well but restricted the mine development of. In order to improve the shaft lifting capacity as much as possible, the shaft lifting system is implemented without major modifications.

Capacity expansion and transformation, through multi-program technology comparison and demonstration, to ensure the successful completion of the transformation [1].
1 mixed well lifting system status
The mixing well lifting system originally used a 6.3m3 bottom-loading bucket with a tank lifting method. In order to meet the production requirements for capacity expansion, the first expansion expansion was carried out in 2009. Under the premise of ensuring the safety and reliability of the lifting system, the arrangement of the wellbore section was not changed, the tank hammer was replaced, and the over-winding height of the well and the well was adjusted. , the hardened wellbore equipment was reinforced. After the transformation, the 7.7m3 bottom dump bucket with tank hammer lifting method, JKMD-2.8Ã—4(I)E floor type multi-rope friction wheel hoist, GZ181-5 type motor, power 800kW; Self-weight 13.5t, effective load 12t, tank hammer weight 19.5t; lifting rope adopts 6VÃ—34+FC type, diameter 28mm, a total of 4, balance tail rope adopts 34Ã—7+FC type, diameter 40mm, total 2 Root, the safety factor of the first rope is 7.88 when lifting, 10.27 when lifting, the maximum static tension is 315.369kN, the maximum static tension is 59.069kN, and the lifting speed is 7.52m/s. The daily calculation is increased by 19.5h, and the lifting amount is about 3595t/d.
2 upgrade system transformation plan
Shaft lifting capacity is the comprehensive ability of the system, which is reflected in the coordination and matching of the capabilities of various equipment in the system. Considering the design of each equipment has a certain margin, through analysis and calculation, find out the key influencing factors [2], and propose two transformation schemes to achieve the purpose of capacity expansion.
2.1 Analysis of the transformation plan
2.1.1 Option 1
(1) The cross section of the bucket is unchanged, the bucket body is lengthened by 0.9m, the bucket receiving port is increased by 0.1m, and the bucket volume is increased from 7.7m3 to 9.3m3. The weight of the bucket is 13.9t, and the effective lifting amount is 14t. Maintain the original cage unchanged, increase the weight in the cage, and control the cage weight to 20.9t.
(2) The ground mine bin and the unloading straight rail are not modified, and the corresponding parking space wedge-shaped tank road is adjusted. The derrick anti-collision beam is moved up by 0.9m, and the wedge-shaped tank path is moved up by 0.9m to meet the requirements of the over-winding length in the safety regulations. Due to the excess length of the downhole roll, it is only necessary to adjust the installation height of the wedge can.
(3) In order to meet the requirements of the original hoist for maximum static tension, tension difference and steel rope safety factor, this transformation uses imported rope. After the transformation, it will only be upgraded as the main well, and no longer undertake tasks such as personnel and materials.
(4) The original bucket measuring device can not meet the needs after the expansion of the bucket. Please ask the equipment manufacturer to design the new equipment according to the original measuring chamber and the installation size of the measuring device.
(5) The actual maximum static tension and tension difference of the system are closer to the allowable value of the hoist. The working life of the hoist is longer. It is recommended to replace the hoist main shaft and the balance wheel. Due to the change in the height of the lift, local adjustment of the electronic control system is required.
(6) After calculation, the force of the derrick, the wellbore tank and the tank beam meet the transformation requirements, and no redesign is needed.
2.1.2 Scheme 2
(1) The cross section of the bucket is unchanged, the bucket body is lengthened by 0.9m, the bucket receiving port is increased by 0.1m, the bucket volume of 7.7m3 is increased to 9.3m3, and the effective lifting amount of the bucket is 14t. In order to meet the safe operation of the system, it is necessary to ensure that the force-receiving part has both the strength of use and sufficient rigidity in the design and reconstruction of the bucket [3]. The partial structure of the bucket is optimized. The adjustment part is not affected by the thickness of the stiffener plate and the specifications of the roller can, and the new NM360 material is used as the liner to reduce the thickness of the liner from the original 12mm to 8mm. The weight of the bucket is controlled below 12.5t. Maintain the original can
The cage is unchanged, the weight in the cage is increased, and the total weight of the cage is 19.5t.

It can be seen from Table 1 that the investment in the first scheme is large, and the replacement period of the hoisting machine spindle and the motor is long, and the effect is slow. The well is the main production upgrading well of the mine, and the suspension of production will inevitably affect the production of the whole mine. In the case of the same increase in production capacity, the length of the renovation period is an important basis for the comparison of the two options. Therefore, the recommended scheme is the transformation plan.
3 implementation of safeguards and issues that should be noted
1 According to requirements, the equipment (including hydraulic brake system, foundation force, etc.) is designed and manufactured according to the maximum static tension of steel wire rope 335kN, the maximum static tension difference of steel wire rope is 95kN; 2 equipment basis is according to the force parameters provided by the equipment manufacturer Designed to meet the needs of the transformation; 3 derrick does not need to be reinforced; 4 to meet the requirements of the anti-skid coefficient, the design requires replacement of the hoist drum and the friction pad of the sky wheel, the pad type is K25 (imported material domestic production) 5 When ordering the wire rope, the rope core is required to be injected with N113 grease; 6 requires the hoist to perform a comprehensive overhaul before the expansion, adjust the coaxiality and parallelism of the spindle device, detect the bearing clearance, and replace the standard in time, pay attention to monitoring The anchor bolts of the bearing housing are replaced if they are loose [5].
4 technical transformation implementation effect
After the mine mixing well lifting system is completed, the lifting system is operating normally. The lifting capacity reached 4019t/d, and the improvement was greatly improved, which relieved the pressure of the mine and achieved good results.
5 Conclusion
(1) The transformation of mine hoisting system is a systematic project. It is necessary to combine the actual production of the mine itself, carry out multi-program comparison and technical demonstration to ensure the maximum benefit.
(2) Do a good job in the organization of the implementation of the technical transformation plan, unified command, clear division of labor, reasonable arrangements, and minimize the downtime.
(3) The selection of lifting system equipment should consider the long-term development plan of the mine. Under the conditions of economic capability, try to get one-stop in one step to avoid unnecessary losses caused by technological transformation.
references
[1] Jia Meng. Technical transformation of main shaft lifting system in Longgu Coal Mine [J]. Coal Mine Machinery, 2003 (9): 101-102.
[2] Zhao Xiaofeng, Chen Xiaofei, Wang Xiaodong. Production shaft lifting system transformation optimization program [J]. Gold, 2012, 33 (6): 36-40.
[3] Zhang Ronghui. Reconstruction of the main well light bucket [J]. Shandong Coal Science and Technology, 2001 (2): 12-13.
[4] Zhang Menglin. Mining Design Manual: Mining Machinery Volume [M]. Beijing: China Building Industry Press, 1989.
[5] Liu Jinpeng, Liu Wanqiang, Li Dingkun, et al. Rationalization of the shaft lifting system of Jintingling Gold Mine [J]. Gold Science and Technology, 2010, 18 (4): 80-81.
Author: Weiguo Chang, Zhang Xiaobo, Jiang Shenglin; CERI (Qinhuangdao) Engineering Technology Co., Ltd;
Zhang Pan; College of Resources and Environment , Northeast Agricultural University;
Article source: "Modern Mining"; 2016.7;
Copyright: Â

Compact Press Feed Line is designed to process the medium plate of metal sheet stamping parts.

Compact Press Feed Line are suitable coil width from 400mm to 1000mm, coil thickness from 0.3-3.2mm, coil weight up to 7000kgs.

Classical Configuration of Compact Press Feed: Hydraulic Coil Car, including travel feature for Coil Reel for coil pick-up and centering. Coil Reel with variable speed drive for additional loop between Decoiler and Straightener. Used for smooth operation even with large coil weights with high line speeds and long feed progressions.Various hydraulic and motorized features and components to enhance capacities and level of automation.

Compact Press Feed line is suitable for motorcycle parts stamping, electric appliance and home appliance stamping, computer frame,refrigerator accessories and air-conditioner parts stamping and etc.
Compact Press Feed Line
Compact Press Line,Compact Press Feed Line,Compact Press Feed,Press Feed lines,Compact Line 3 In 1,Coil Feed line,Coil Handling System
Mayflay Machinery(huizhou) Co.,LTD , https://www.pressfeeders.com