This construction method is used in the DN250 of Nanyang Power Plant, which is 2km across the urban area, to transform second-hand equipment with a domestic CNC system. Zhouhaonong CNC technology is an important development direction of the machinery industry and the core of manufacturing technology. At present, most of the newly equipped CNC systems are imported. Once "others" take sanctions, most of our CNC equipment will not work properly due to problems with accessories. Therefore, we urgently need to develop our own CNC system to improve the domestic CNC system. Application capabilities.
1. Using the Huazhong I type to transform second-hand machining centers. At the end of 1995, the company imported 12 second-hand machining centers from Germany, including 8 CW630 and 4 DECKELS400, which were used to process 4105 multi-cylinder diesel engine blocks. If the same new equipment is imported, the cost will be more than RMB 3 million per unit. (When the fashion does not have this type of domestic equipment) After installation, it is debugged by German technicians. After debugging, 6 CW630s will be free of maintenance. Due to the outdated system, lack of accessories, and frequent failures, it is difficult to meet the production needs. For this reason, we decided to use the domestic Huazhong I-type CNC system to transform the second-hand machining center for four reasons: the imported CNC system has reliable performance and complete functions. There will be no failures within the system, but no matter how good the system is, there will be failures. Once there is a problem, production cannot be resumed in a short period of time. The ordering of accessories also takes three months and the price is staggering.
The imported numerical control system uses a special computer, which has poor openness and is not easy to upgrade.
The service fee of a foreign company is charged per person per hour, generally about 300 yuan, and a certain amount of base price must be paid first. The length of repairs can only be decided by them. This is obviously unfair and difficult for many companies to accept.
The Huazhong I-type CNC system, which uses industrial PCs as hardware steam heating pipe network projects, has been applied and has received very good results.
In the construction, the rare earth composite insulation materials produced by Nanyang Energy Saving and Thermal Insulation Material Factory were used. The materials were mainly based on natural minerals such as sepiolite, sillimanite and other inorganic fibers as base materials, with rare earth as additives, and more than ten kinds of ingredients. Chemical raw materials are made into an electrostatic composite thermal insulation material through physical and chemical processes. The electrostatic effect is mainly to produce the adsorption effect on the metal surface.
Its main technical parameters: liquid density 0.78t / m3, dry density 025 ± 0.02t / m3, dry shrinkage rate about 35%, thermal conductivity 0.06WmK), heat resistance 800 ~ 1000 (no deformation, no cracking, no weathering) ), The bonding strength is 1.06x105Pa, the pH value is about 7.5, and the closed porosity is 84%. Since the product contains antiseptic, the surface of the steel pipe does not need to be treated for anticorrosion.
The so-called synchronous thermal elongation movement method refers to the thermal insulation material can be simultaneously extended with the steel pipe. The coefficient of linear expansion of the steel pipe is 1.2xlO5K. The medium temperature is assumed to be 350T. The average temperature of the coldest month is -5. When the steel pipe is thermally extended, the middle position of its length is regarded as a relatively static point with the insulation material, so that (12-0.3) + 2 = 0.025m at each end of each steel pipe. In this case, the flexibility of the insulation material and The adsorption force can perform thermal motion together with the steel pipe. And the heat insulation material of the welded part of each two steel pipes adopts prefabricated tile blocks for heat insulation, so that each heat insulation tube is in a relatively independent state.
The surface of the insulation layer is protected by a waterproof glass fiber reinforced plastic, usually two cloths three fats or three cloths four fats, see.
3. Thermal compensation for some other technical problems of directly buried steam pipes. â‘ The casing compensator must be used as a compensator well, and at the same time, a guide sliding bracket should be prepared. â‘¡The bellows compensator can be used for the general type, which must be used as a compensator well; the new directly buried corrugated compensator can also be used instead of an inspection well. â‘¢ Pay attention to the insulation treatment of the elbow with the square compensator.
In order to make the pipeline neither arch left nor right, nor arch up and down in the middle of the two fixed piers, the guide bracket must be added properly. The pipeline drain should be close to the fixed bracket, and the drain valve should be separated from the main pipeline, see.
〔Editing Ao Liwen〕
Bed Series,Sofa Bed Series,Fold Up Bed,Folding Bed Series
AU-PINY FURNITURE CO., LTD , https://www.jmaupiny.com