1、翻译部分JOURNAL OF COAL SCIENCE &ENGINEERING(CHINA) ISSN 1006-9097pp 7882 Vol.10 No.1 June 2004Research and development on cutting scale machine in the coalmine shaftREN Bao-cai (任保才)(The Mechanical Engineering Department, Jiaozuo Institute of Technology, Jiaozuo 454000, China)Abstract The deposit scale
2、 in the coal mine shaft usually causes serious accidents, such as making rope broken, cage seized or dropped. To solve this kind of problems, the research of the cutting scale mechanism was made, and a new type of removal scale equipment was made with using imported hard alloy material. The cutting
3、experiment and actual cutting show that it can adapt to abominable condition in the shaft, such as narrow space, wet and excessive shaft crevice water and so on, and can work safely and reliably, and has high cutting scale efficiency. It can also cut out the deposit scale in the circular section of
4、shaft.Key words deposit scale in shaft wall, cutting scale, cutting mechanism, cutting scale machineIn the service shaft of Tongye Coal Mine of Anyang Mining Bureau, the shaft crevice water is excessive, and in water there is a large of lime stone deposit, which leads to large scale on the shaft wal
5、l through long time, which is 300 mm in thickness. The initial design diameter of the shaft is D=3.2 m,the clearance between the cage and the shaft wall is 200mm, but now the projecting part of cage has been embedded in the scale about 100 mm, which is shown in Fig.1. Once in a winter, the shaft cre
6、vice water frozen and seized the elevating cage, this made the winding rope broken suddenly, and led the cage to drop into the bottom of shaft, which caused large economic losses. The scale in the shaft wall is always one of the hard problems puzzling this coal mine. The study about the scale is mor
7、e than 100 years, and great progress have been made 14,which is presented mainly in two different aspects.The first is to control and slow the scale to form,and study the principle how the scale is formed and the dynamic model that the scale is separated out and sunk58 and so on. Using chemical meth
8、od,clear out the scale by pretreatment and intenerate to water, such as adding antifouling composition and so on. The second is to clear out the scale existing on the shaft wall, mostly using chemical, physical9,10, abrasive jets methods and so on. But these methods have not been found to be used in
9、 the aspect of cutting scale on the wall of the shaft11. The author puts forward a new scale removal method based on the cutting experiment of the scale sample,and has developed a cutting scale machine type SGQ-1. The parting tools are made of an imported hard alloy material, and the door frame oper
10、ating mechanism is designed to adjust the tilt angle of the table, all of them can improve the adaptation of cutting the scale on the circular section of shaft wall.Fig.1 The scale in the shaft wall1 Analysis of the condition of cutting the scaleThe water resource of the formed scale on the shaft wa
11、ll is ground water, which flows into the shaft through the cracks on the shaft wall, by the long-term more than 30 years accumulation, the thickness of scale on the shaft wall is above 300 mm. This shaft is more than 180 m deep, which has bunton beams every 3 m. Only on the shaft wall which is about
12、 40 m in depth from the ground surface, here are no shaft crevice water and scale, but on the lower part of the shaft wall, button beams, cables, water pipes, wind pipes and so on, there are serious scale. The outer diameter of the cable laying down the shaft 30 years ago is 70 mm, but now has incre
13、ased to about 120 mm, which is shown in Fig.2.The results of the assay and analysis of the scale on the shaft wall 12 are shown in Table 1.Fig.2 The scale on cable(a) Comparison of the scale on cable; (b) Annual ring type scaleTable 1 Chemical composition of scaleTable 1 shows that the shaft scale i
14、s mostly made of limestone, silica sand and cementations adhesion and so on. The reason is that the limestone dissolved in the shaft crevice water has gradually formed milky lap descent sediment by long-term accumulation. And the sand with coal and dirt blown into the shaft from ground have attached
15、 on the shaft wall together. As a result, these materials have interacted each other to form the scale.The section of the scale that shows annual ring type texture can prove this point. Hardness value of the scale is equivalent to the rocks hardness value f 5, and it has high wear-resistant and its
16、one-way tensile strength is more than 24.8 Map. When we cut the scale, we cannot affect the normal lift and production of the coal mine. Above all, the scale in this shaft is very serious, the difficulty of cutting the scale and the large amount of work, are really infrequent in our country.2 The development about cutting scale Machine 2.1 Machine structure of cutting scale machineTo d
