This morning, the working comrades of the safety standard national mine product safety sign center came to our company to guide the work and held a discussion with the relevant heads of various departments of our company.
       The safety standard group listened to the work report of our company, the development of the company in 2015, the difficulties and work conditions encountered in the work, the development and future planning of the coal industry under the severe situation, etc. The safety standard team conducted systematic investigation and investigation on the production situation, inspection equipment, procurement specifications, management system documents and technical documents of our company, affirmed our work, and put forward some deficiencies and areas to be improved. We should further enhance our service awareness, strengthen our own responsibility, improve the information level and strengthen personnel management, Comprehensively improve the technical support and service capacity of safety standards, and make greater contributions to mine safety production in China. The relevant personnel of the company's departments carefully listened to and recorded the opinions and suggestions of the safety standard center. Under the current severe situation, they should make more refined products and services, obtain greater competitiveness with quality and services, strictly follow the rules for process control, control the quality and make better and more refined products. For the company's concrete spraying machine, wet spraying machine, grouting machine, mortar pump and automatic feeding shotcrete truck, we will create a number of high-quality products, achieve better development and make greater contributions to China's mine engineering....

       The shotcrete machine is also called concrete shotcrete machine. It uses compressed air to transport the concrete mixture according to a certain proportion through the pipeline and spray it to the sprayed surface at high speed to set and harden, so as to form the concrete support layer. With its simple process, unique effect, economic cost and fast construction speed, shotcrete technology is widely used in construction, railway highway tunnel construction, mine roadway construction, slope reinforcement and other fields.
       Working principle of the shotcreting machine: the mixed dry materials are fed into the shotcreting machine through the discharge port of the batching mixer (or manual mixing and feeding) through the vibrating screen. The material is stirred by the ejector and injected into the material cavity of the rotor assembly. The material cavity rotates with the rotor body to the discharge port, where compressed air is introduced from the air circuit system, the materials are blown into the discharge elbow, and another stream of compressed air is introduced by the cyclone, Blow and accelerate the materials in the form of multi head swirling flow, rotate and float them, enter the material conveying hose, reach the nozzle, add an appropriate amount of supplementary water, and then spray them on the sprayed surface. ...

       On July 8, Bangladesh Railway Bureau and China Railway Corporation signed the construction contract of Bangladesh Padma bridge railway connecting line project, which agreed that the company would be the general contractor of the project. The main line of the new railway of the project is 168.6km long, single track, wide gauge, and the speed target value is 120km / h. The contract amount of the project is US $313875 million, equivalent to about RMB 20.80897 billion, accounting for about 3.33% of the company's latest audited operating revenue. The total construction period of the project is 54 months
　　        In this regard, some people in the industry pointed out that the railway has always been regarded as the main artery of the national economy and plays a leading and basic guarantee role in economic and social development. While driving China's rapid economic growth, China's railway will also change the world's understanding of China, so that China will influence the world with the power of "innovation". The completion of one belt, one road and one bridge between the 21 bridges in the southern part of Dhaka and the capital of the capital, will be completed by the completion of the Padma bridge and the Padma bridge. This line will become one of the important passages of the Pan Asian Railway and an important pivot project for the "one belt and one road" strategy.
       Accelerating Railway Construction at this stage is also the meaning of promoting supply side structural reform. Analysts pointed out that the railway network connects cities at all levels, the investment scale is trillions of yuan, and is related to the rise and fall of dozens of industries, which can be said to affect the whole body. For this reason, increasing railway investment at present can not only enrich people's travel choices and improve the transportation structure of poor areas in the central and western regions, but also hedge the current great downward pressure on the economy, but also help to promote the transformation and upgrading of high-end equipment manufacturing industry. It can be said that the four arrows of making up for weaknesses, benefiting people, stabilizing growth and adjusting structure can be launched at the same time, killing many birds with one stone
       Xinke shotcreting machine grouting machine wet shotcreting machine mortar pump mixer assistant world project!

       Wet shotcrete machine plays an important role in shotcrete support operation with its excellent performance. It adopts advanced wet spraying mode, which is environment-friendly and dust-free, improves the working environment, has low rebound rate and high material utilization rate. Due to the special process of wet spraying, the material mixing is more uniform, the spraying effect is good, and the shotcrete layer concrete is dense, uniform and high strength. These many excellent characteristics need to be guaranteed by a key technology, that is, the transportation system of accelerator. An excellent accelerator conveying system can ensure the above excellent spraying effect. This system should be composed of an accurate metering system and a strong conveying system. If the metering is not accurate, the accelerator addition may be inaccurate. Generally, the accelerator addition amount is about 5% of the cement. If the addition amount is too small, it will not achieve the effect of rapid solidification, The sprayed concrete layer will collapse or segregate due to too long setting time, resulting in poor spraying quality, affecting the strength and flatness of the spraying layer. In serious cases, it will cause a large area of falling off of the spraying layer and poor effect. If the addition amount is too large, expensive accelerator will be wasted, resulting in high cost. Too much accelerator will reduce the later strength of the spraying layer, increase the rebound rate, and fail to achieve the ideal spraying effect. Therefore, accurate measurement of accelerator addition is very important in wet spraying process. The delivery system of the accelerator needs enough pressure to accurately deliver the accelerator in place according to the quantity. The delivery system is generally composed of a pumping system. Generally, the plunger pump with large delivery pressure is selected. This pump is generally driven by the motor forcibly, and the delivery pressure reaches more than 1MPa, exceeding 0.4MPa of the injection system, which can ensure the accuracy of the delivery process, The accelerator will not be transported in place according to the set metering due to the problem of transportation capacity. The transportation is more stable, the transportation distance is long and the metering is more accurate. Some commonly used pneumatic diaphragm pumps have limited pressure due to the use of system wind pressure of 0.4MPa. After measurement, due to the same pressure as shotcrete, they can not smoothly and accurately transport sufficient accelerator in place. In the middle, there will be a part of measurement loss, resulting in the inconsistency between transmission and measurement, affecting the spraying effect. Generally, the farther the spraying distance is, the more obvious this effect is. In extreme cases, it may cause transportation failure. However, due to the low price of pneumatic metering pump, it has been applied by some manufacturers. For those with high requirements on injection quality, these effects should be fully considered. A wet spraying machine equipped with powerful motor-driven plunger pump metering and conveying system is the priority to ensure the injection quality, so as to achieve the real injection effect, have the practical significance of wet spraying, achieve the ideal injection effect, environmental protection, no dust, low rebound rate and high material utilization rate, The shotcrete layer is dense, uniform and high strength. ...

       Grouting machine, that is, grouting pump, plays an important role in grouting construction. Grouting technology has achieved great development in recent years. Grouting has become an engineering discipline. It has become a comprehensive discipline of cross disciplines such as civil engineering, rock, chemical industry, machinery and geology
       It is mainly to strengthen the formation and plug the leakage, improve the bearing capacity and stability of the formation, and improve the air tightness of the formation in the underground gas storage. It mainly includes fault fracture zone reinforcement, grouting and water plugging, etc. After more than 100 years of development, grouting has developed from the earliest single liquid grouting to multi-liquid grouting, from clay to chemical grouting, and the equipment has developed from a single grouting equipment to a complete set of special equipment such as survey, pulping, grouting, recording, inspection and analysis
       Under a certain pressure, grouting will press the curable liquid into the gap between the stratum and structure to fill and solidify, so as to improve the physical properties of the stratum and structure, and achieve the purpose of reinforcement, water stop and leakage prevention. In the process of slurry injection, the slurry generally penetrates first. When the channel is blocked, it is difficult for the slurry to penetrate, that is, the surrounding strata are compacted. When the pressure continues to rise, splitting occurs in the soil, and the slurry further diffuses along the crack. The penetration, compaction and splitting affect and complement each other, It can improve the integrity and strength of soil and reduce the permeability coefficient and water content of formation
       Infiltration grouting: fill the gap or crack, discharge the free water and gas in the hole, and do not change the soil structure. The end point grouting is spherical diffusion, and the flower tube segmented grouting is cylindrical diffusion
       Splitting grouting: overcome the initial stress of the stratum and the tensile strength of the rock mass through pressure, so that new fractures appear in the stratum, and the fractures are filled with slurry
       Compaction grouting: grout bubbles are formed around the grouting points to compact the soil

       The shotcreting machine is also called concrete shotcreting machine. Its common faults and treatment methods are as follows:
       1. Motor does not run
       Cause analysis: circuit fault
       Solution: ask electrician to check
       2. The motor rotates and the rotor body does not rotate
       Cause analysis: gearbox gear is damaged
       Solution: overhaul the gearbox
       3. Air leakage between rubber binding plate and rotor
       Cause analysis: the pressing device is too loose or the rotor lining plate and rubber binding plate are damaged
       Treatment method: check the pressing device, remove the materials between the rubber binding plate and the rotor lining plate before pressing, or replace the rotor lining plate and rubber binding plate
       The simple treatment method of shotcrete machine can solve big problems and avoid affecting the project progress. It is the necessary knowledge of shotcrete staff
       Grouting machine, also known as grouting pump, is a necessary equipment for grouting operation. Mastering its common faults and treatment methods is a necessary knowledge for each grouting operator. The common problems and analysis are as follows:
       1. There is no pressure in the oil pressure system or the pressure does not go up
       Cause analysis: the oil pump rotates in the wrong direction
       Solution: reversing
       2. No sizing or insufficient sizing
       Cause analysis: air leakage of slurry suction pipe
       Treatment method: check the air leakage and deal with it
       3. Motor overheating
       Cause analysis: the voltage is too low
       Solution: check the circuit, find out the cause and deal with it
       The simple treatment method of grouting machine can solve big problems and improve work efficiency