机械类外文文翻译--抛丸清理机对板材轧辊进行抛丸处理(编辑修改稿)

机械类外文文翻译--抛丸清理机对板材轧辊进行抛丸处理(编辑修改稿)内容摘要：

The pressed air supplied to the collector of the shot blast equipment is dried by an oil moisture separator. However, this method of drying is inadequate. Water vapor condenses in the main line and in the shot blast equipment, and as a result shot sticks together in the lower partment and forms a solid mass. The solid mass clogs the vertical channels along which the abrasive is transported to the collector and disrupts the optimum ratio of shot to air in the blast. This has a detrimental effect on the blasting process and the quality of the roll surface. The presence of moisture in the air causes corrosion of the equipment and causes operation of the pneumatic equipment of the machine to be poorer. Therefore, in designing shot blast equipment,it is necessary to specify equipment for drying the air. Foreign firms, for example, use special drying equipment utilizing water absorbing substances such as silica gel and activated alumina for drying pressed air. 5 The mechanism for moving the nozzle has a number of shortings. Application of the jet of abrasive material on to the roll is through a nozzle mounted in an elbow shaped gun (Fig. 2). A shorting of the gun is the throttling of the mixture of pressed air and shot where the vertical and horizontal channels join. The junction is a right angle, which causes quick wearing away of the elbow. The cross sections of the channels and nozzle was increased. However, with an increase in the nozzle diameter from 10 to 12 mm (the allowable maximum) the consumption of air increased from 13 to 19 mS/h, which changed the ratio of shot to air in the blast. However, thisratio must be kept constant. Since during blasting it is difficult to make corrections, it was necessary ~o improve the design and increase the wear resistance of the parts. For this purpose a new design of blast guns, in which the diameter of the channels was increased (Fig. 2 b) and the shape of the transition from the channel to the channel and nozzle was changed, was proposed and tested, The new nozzle design is much more effective. After five months of operation,noticeable signs of wear in the elbowand nozzle have not been found, while the old design elbows wore out in a month. 6 The blast guns are moved along the roll by a conveyor belt. Under the action of the weight of the and oscillations caused by its movement along the guides on which shot falling from the surface of the rolls accumulates, the belt gets out of alignment. As a result, the impact of the stream of shot on the surface is not at a right angle, but glancing, which produces a poorer surface quality. Placing a strip under the gun eliminated this problem, and the roll surface quality became satisfactory. In the first period of operation the pressed air tn the SM2 machine was obtained from the shop main i39。 ,ine, which has a pressure of 6 atm. According to readings on a manometer placed before the collector of the shot btaat unit, the air pressure in it did not exceed aim. With this pressure, even with the use of the finest shot (), the roughness of the rolls is at the upper limit (R a = ). Therefore, it was necessary to reduce the working pressure of the air. An air valve was used to control the pressure, but it was very sensitive to changes in air pressure, an。