product news/產品新聞
control department. Because of the weight of the castings, a spinner/hanger shot blast system was not feasible. “We looked primarily for a simple but effective shot blast
system that guaranteed a high functional reliability and was easy to maintain,” Sapetko said. “Of course, economic aspects like the purchasing price and operating costs played also a significant role in our decision.” Te continuous rail shot blast system RDS 80/70 is cer-
tainly the biggest ever built by Rösler. It had to be placed in the building to fit exactly between the support pillars. Te blast machine inlet and outlet areas are equipped with double wing steel doors lined with wear resistant rubber to prevent spillage of blast media. Te 100 ft. (30m) machine is divided into three sections: inlet and outlet chambers and a blast chamber with inner dimensions of 35 x 26 x 23 ft. (10.5 x 8 x 7m). Te large width of the blast chamber allows complete rotation of parts with a length up to 23 ft. (7m).
Te RDS 80/70 is equipped with eight Hurricane H42
turbines mounted to the ceiling, respectively one side wall, of the blast chamber with an installed drive power of 22 kW each, throwing over 4,400 lbs. (2,000kg) of blast media per minute. After their first pass through the blast machine parts longer than 23 ft. (7m) are picked up from the transfer system turn table by the existing bridge crane, rotated 180 degrees and placed back on the turn table for a second pass through the machine. Tis ensures all around blast cleaning of parts which, due to their length, cannot be rotated on the turn table. For optimum wear protection the blast chamber is fabri-
cated from manganese steel and lined with easy to exchange overlapping manganese wear plates. To allow manual spot cleaning of critical surface areas, the RDS 80/70 is equipped with a pressure blast system and lighting in the blast chamber. A special technical feature of the EMSS shot blast
machine is an extra-large media hopper allowing the storage of 30 metric tons of blast media. Tis ensures the shot blast process will not be interrupted because of lack of blast media in the system due to media carryout. Te blast media thrown by the turbines is collected in two large hoppers placed in the foundation pit from where the media is transferred to the transport system of the media cleaning and classification unit. Tis posed another technical challenge, because the rails of the part transfer system allowed an access opening of only 6.6 x 6.6 ft. (2 x 2m) for placing all these equipment components in the foundation pit. For this reason, the media collecting hoppers below the blast chamber had to be fabricated in 15 individual sections instead of normally four sections. A five story maintenance platform allows quick and easy
access to all equipment sections. “With the new shot blast system from Rösler we achieve
the required surface cleanliness with the blast media consumption cut in half compared to our old manual blast cleaning system,” Sapetko said. “In addition, we were able to significantly reduce the blast cleaning process times. Where previously several employees needed weeks of manual blast- ing, we are now completing the same blast cleaning process within a few hours.”
“我们希望要的是简单、高效、功能可靠且易于维 护的抛丸系统”Sapetko说，“当然，经济性方面如 采购价格和运营成本也在我们的决定中发挥了重要的 作用。”
轨道式连续通过抛丸系统RDS 80/70肯定是Rösler 公司有史以来生产的最大的抛丸设备。它必须被十分 精确的放置在厂房内各承重柱之间。该抛丸机的入口和 出口是双翼钢板门并配备耐磨橡胶衬里，防止磨料介质 的泄漏。100英尺（30米）长的设备被分为三个部分： 工件入口和出口腔以及内部尺寸为35 X 26 X23英尺 （10.5×8×7米）的抛丸室。抛丸室 最大宽度达23英尺 （7米），也是满足工件旋转的最大尺寸。 RDS 80/70抛丸机装备有8台Hurricane H42涡轮 机，安装在顶部和两侧墙壁上，抛丸室中每个抛头功 率为22 kW，每分钟可通过磨料4400磅（2,000 kg） 。长度超过23英尺（7米）的工件第一次通过抛丸机 后，用现场的龙门起重机从从回转台上吊起，旋转 180度，并放回转台第二次通过抛丸机。这可以确保 受长度限制，不能在回转台旋转的工件所有位置都能 抛丸清理。
为了获得最佳的抗磨保护，抛丸室由锰钢制成，内 衬是易于更换的拼接锰耐磨板。为了能够手工清理设 备清理不到的地方，RDS 80/70的抛丸室内配有压力 送风系统和照明。
EMSS公司抛丸机特殊的技术特点是超大的磨料料 斗，能够存储30吨的磨料。这将确保抛丸过程不会因 为系统缺乏磨料供应而中断。抛头抛出的磨料被收集 在位于基坑中的两个大料斗内，经磨料输送系统运到 磨料清洁和筛分单元。这也带来另一个技术挑战，因 为轨道运输系统只允许基坑内设备的通道开口最大为 6.6×6.6英尺（2 x 2米）。出于这个原因，在抛丸室 下方的磨料收集斗被做成15个独立的部分，而不是通 常的四个部分。
5层维护平台可以快速和方便地对设备任何部分检 修。
“随着Rösler公司新喷丸设备的安装，我们实现了 所要求的表面清洁度，并且相比旧的手工抛丸清理系 统，磨料的消耗减少一半，”Sapetko说，“此外， 我们能够显著减少抛砂清理所用的时间。以前使用手 工抛丸设备需要几名员工数周时间完成的清理工作， 现在可在几小时之内完成。”
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION June 2014
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