Chinese
Mold cleaning process
Clean the concrete slag or impurities on the end and sides of the demolded mold, and spray the diluted isolation agent in a mist from the nozzle evenly on the surface of the steel mold.
Qufu Juli Railway Track Engineering Co., Ltd
Qufu Juli Railway Track Engineering Co., Ltd. was founded in 2001.
Located at the southern end of Chuangye Avenue in Taiwan Industrial Park, eastern Qufu. Located to the east of the Beijing Shanghai high-speed railway, to the south of the Ridong expressway, to the west of the Jingfu expressway, and to the north of the intersection of National Highways 104 and 327, it enjoys a prime geographical location. The factory covers an area of over 200 acres, with a building area of over 30000 square meters and 350 sets of various mechanical and power equipment. The total value of fixed assets is over 80 million yuan, with 212 employees and 29 professional and technical personnel, including 4 with senior technical titles, 12 with intermediate technical titles, and 13 with junior technical titles. There are 48 intermediate professional and technical workers, and a five department one room management system has been established under the senior management of the chairman, general manager, deputy general manager, and chief engineer.
Our company has received unanimous praise from multiple units such as China Railway First, Third, Ninth, Eleventh, Fourteenth, Seventeenth, Nineteenth, Twentieth, Twenty Fourth Bureau, Bridge Bureau, Tunnel Bureau, Zhongshui, and Zhongtu for the railway sleeper molds with speeds of 120, 200, 250, 300, and 350 kilometers per hour and the new steel molds jointly developed with the Ministry of Railways for 15 consecutive years. We have participated in cooperation in national key projects such as the Qinghai Tibet Railway, Beijing Shenyang Railway, Harbin Dalian Railway, Beijing Shanghai Central South Corridor, and Jiaozhou Jinan Railway. In China's international support for railway construction in Asia and Africa, we have provided rail sleeper production lines, mold manufacturing, installation, and technical guidance for Myanmar, South Africa, Angola, Ethiopia, and Kenya. In 2013, our company collaborated with Beijing Jiaotong University to jointly develop the country's first RPC concrete ball joint, which was approved by expert review. Our company has become a well-known and excellent enterprise in the domestic railway industry, specializing in the manufacturing of molds and non-standard equipment with strong influence.
With the rapid development and production demand of China's railways, our company's rail sleeper production line keeps up with the pace of the times and industry demands, constantly optimizing. Our company's production line for rail sleepers using the assembly line method has been used by multiple rail sleeper production enterprises in China for many years. It is a set of mature rail sleeper production line equipment with high efficiency and low failure rate. Our company has established its own rail sleeper production plant using this production equipment, and our rail sleeper products have obtained a production license from the General Administration of Quality Supervision, Ltd. of China.
We are not only a manufacturer of production line equipment and molds, but also a manufacturer of rail sleeper products. We use our own manufactured equipment to produce rail sleepers, and provide molds for other rail sleeper manufacturers nationwide. Therefore, our company has become an enterprise that integrates mold making, rail sleeper production line making, and rail sleeper production. Our company has established a technology department with over a hundred patents. Our senior engineers in the company can real-time monitor the operation of the rail sleeper production equipment. After years of research and practice, we have developed an operating system for rail sleeper equipment production. Our company has successfully completed turnkey projects in Nigeria, Ethiopia, Shandong CRRC in China, China Railway 15th Bureau, and others, enabling the output of the entire production line.
Our company's rail sleeper production line using the assembly line method is convenient for achieving mechanization and specialization in production. When the product types change, the production line can be flexibly adjusted, making it suitable for producing various specifications of concrete rail sleeper products, such as; Domestic railway sleeper models (IIIA type) Type IIIC Type XII IIIQa type IIIQc type Fork pillow Subway sleeper Double pillow Wide pillow The production line can also produce cement prefabricated square piles, railway guardrails, railway cover plates, and so on Wait for diversified cement products.
At present, the people of Juli are building a beautiful new Juli with full enthusiasm, new pursuits, keeping pace with the times, exploring and innovating. In 2015, our company jointly invested 30 million yuan in Beijing to build a domestically advanced rail sleeper production line and established Qufu Rongbang Transportation Rail Technology Co., Ltd. The company mainly produces general sleepers such as New II type sleepers, IIIa type sleepers, and New III type bridge sleepers, as well as III type sleepers for passenger dedicated lines, IIIPC type bridge sleepers, general line switch sleepers, and various sleepers for urban subways and light rail tracks. At present, all products produced meet the standards and are qualified. Some products have been sold to Beijing, Tianjin, Shijiazhuang, Lianyungang, Mongolia and other places, and have received unanimous praise from customers.
Integrity / Professionalism / Innovation / Win-Win
Clean the concrete slag or impurities on the end and sides of the demolded mold, and spray the diluted isolation agent in a mist from the nozzle evenly on the surface of the steel mold.
By installing process accessories such as rubber bolts, high-performance resin bolts, and iron bolts, the mold can be erected laterally at 80 degrees, which facilitates the fixation of embedded parts. The pre embedded casing and other accessories should be firmly and vertically fixed to prevent defects such as sinking and tilting of the finished casing.
Thread the cut steel bars into the corresponding tension plates and grout plates according to the arrangement of the sleeper steel wires, and perform upsetting at both ends. Move the steel wire group with the already upset head, along with the tensioning plate and grout stopper, into the steel mold. Install the stirrups and spiral bars in the designated positions. Insert the tensioning plates at both ends into the tensioning box and the fixed end of the mold, and use rubber partitions to fix the grout stopper at both ends of each mold section, so that the grout stopper is tightly attached to the end face of the mold to avoid grout leakage.
The tension force is automatically controlled and stored by the computer. Firstly, use tensioning nuts to firmly connect the tensioning rod of the mold to the tensioning machine. Then, start the tensioning program for automatic tensioning. When the initial tensioning force reaches about 60kN, quickly tap the tensioning plates at both ends of the mold to make the prestressed steel bars reach the specified position. Restart the second tensioning and tighten the nut while tensioning. When the tensioning force reaches the specified value, hold it for one minute while locking the tensioning nut. After completing the tensioning operation, wait to enter the next process.
The technical department distributes the concrete mix proportion through computer automation control based on daily detection of sand and gravel moisture content, achieving accurate weighing of raw materials. During this process, the material is mixed twice before being discharged. The mixed concrete mixture is discharged into the storage hopper of the pouring truck under the platform through the discharge door.
Firstly, the surface of the mold and the temperature of the concrete should be measured regularly every day to meet the process requirements before pouring the concrete The infusion is carried out in two stages. In the first stage, slowly open the compartment door and dispense the material at a ratio of about 1/3. For the second time, control the size of the opening of the warehouse door and continuously discharge the material, trying to ensure that each part discharges the material appropriately and evenly.
The rail sleeper model that has been poured with concrete is smoothly transported to the vibration table through the mold roller conveyor, and the program is started for vibration compaction. Then, the rail sleeper model is smoothly transported to the next vibration table. Align the embossed cover plate with the mold position and cover it tightly, then perform a certain period of loading vibration.
Firstly, clean up the excess concrete on the edge of the rail sleeper groove and model, ensuring that both sides of the bottom surface of the rail sleeper are straight. After the edge cleaning is completed, the automatic hanger is lifted by a crane to securely fasten the rail sleeper mold into the kiln. During transportation, it must be carried along the guide rails in the pool? Gently drop and place to reduce vibration. The placement of the rail sleeper model after entering the kiln should be kept vertical, horizontal, and neat. After filling the kiln, the maintenance kiln cover should be tightly closed in a timely manner, and an appropriate amount of water should be kept in the water seal tank to prevent air leakage, and the maintenance personnel should be notified for maintenance.
The maintenance is carried out using automatic temperature controlled steam, and a reasonable steam curing process is selected according to different seasons and materials. The maintenance process is divided into four stages: static stop, heating up, constant temperature, and cooling down. Determine the curing time according to the process specifications.
The release of tension is carried out using either an automatic hydraulic release machine or a hydraulic wrench. The automatic release machine is used to slowly release stress, and the release tension should not exceed 90% of the tension force. Until the stress is relaxed, then cut the steel wire. It is absolutely forbidden to cut the steel wire directly under stress. After the tensioning is completed, send the sleepers to the demolding machine.
After the staff confirms that the rail sleeper model is firmly clamped onto the support arm of the demolding machine, the demolding machine is started. The model rotates 180 degrees and lightly lands on the finished product roller conveyor. Then, transport it to the cutting site to prepare for cutting. When cutting, use a toothless saw to slowly cut the steel wire. When approaching the saw, align it with the neutral position and do not damage the concrete sleeper. During this period, dedicated inspectors conduct inspections according to product qualification standards, separating qualified and unqualified products for storage.
After cutting, the finished rail sleepers need to be stacked. When palletizing, it is required to place them neatly. A hard wooden strip of about 5 centimeters should be placed on the outer side of each layer of rail sleeper groove from the shoulder, and the cushion should be in a straight line from top to bottom. At the same time as palletizing, the iron barriers between the sleepers should be promptly removed and cleaned, and returned to the steel wire assembly work area. The palletized finished rail sleepers are transported to the finished goods warehouse by the outbound trolley. When stored, wooden strips with a thickness of not less than 4 centimeters should be placed between each layer of sleepers to facilitate loading and unloading operations. Sleepers that pass inspection should be handed over to the warehouse with a certificate of conformity issued by the quality inspection department. After the sleepers are stored, they should be maintained according to the technical specifications.
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