【Major Equipment in the Chemical Equipment Industry】036 – Large-scale EO Reactor 7.3-meter Support Plate
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This post was last edited by Desert Fish on 2022-3-23 09:09. The past decade has been a period of rapid development for China’s chemical industry, with the emergence of many new processes, products, and equipment. China’s chemical processing equipment has also seen significant progress, which in turn has contributed to the swift development of the petrochemical industry. Here, we have compiled some of the achievements and breakthroughs made by Chinese equipment manufacturers in terms of larger-scale production and localization of equipment. Everyone is welcome to share, discuss, and exchange ideas; let’s cheer for Made in China and support the development of chemical processing equipment! *********************************** At the end of July 2018, Daming Heavy Industry completed the installation of the imported Ocean DMGD4-80120-CNC four-axis gantry CNC milling and drilling machine. At the beginning of August, this equipment was used to manufacture a 7.3-meter support plate for an EO reactor for an internationally renowned pressure vessel manufacturer. The base frame of this CNC milling and drilling machine features high rigidity and stability; by optimizing the reinforcement structure, its overall rigidity is enhanced and its dynamic performance improved. This equipment enables three-axis coordination; once the workpiece is clamped, it can undergo various machining operations such as milling, boring, drilling, reaming, and tapping in a programmed manner. This not only reduces the production cycle but also **improves labor productivity**. This machine tool can be widely used in the processing of large tube sheets, flanges, discs, and structural connectors for steel beams.
The drilling accuracy of the support plate directly determines the assembly precision of the heat exchange tubes. If the clearance between the heat exchange tubes and the support plate exceeds the specified limits, resonance can occur during operation, thereby reducing the service life of the equipment. To ensure smooth assembly later on and to avoid scratching the heat exchange tubes, high requirements are placed on the concentricity of the tube holes in the support plates as well as on the roughness of their surfaces. This processing involves large-diameter support plates; it is difficult to drill holes in five pieces stacked together after drilling one piece, and it is also necessary to take into account any misalignment between the stacked plates. During the hole-drilling process, it is essential to maintain proper hole diameter, quality of the hole edges, and surface roughness. If a large-scale machining center is used to process each piece individually, this will inevitably **prolong the delivery time of the product**. The Processing Plan Review was conducted by Production Department 3 of Daming Heavy Industry; ultimately, a heavy-duty gantry mobile drilling and milling machine equipped with 4 drilling and milling heads was used. By integrating drilling, rigid tapping, and reaming into a single process, **processing efficiency was improved.
For the 7.3-meter-diameter support plates processed this time, the drilling accuracy plays a crucial role in determining the assembly precision of the heat exchange tubes. Excessive clearance between the heat exchange tubes and the support plates can lead to resonance during operation, thereby reducing the equipment’s service life. To ensure smooth assembly of the heat exchange tubes without damaging them, it is necessary that the holes in the support plates be highly concentric, and the surface roughness of these holes also needs to be very high. Ultimately, Daming Heavy Industry improved processing efficiency and ensured processing accuracy by using an oceanic four-axis gantry CNC milling and drilling machine, which integrates drilling, rigid tapping, and reaming in one operation.
The 【Haichuan Equipment Guessing】 series is being updated continuously in 2022; all Haichuan community members are welcome to participate actively! https://bbs.hcbbs.com/thread-2079686-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum) Summary post on the series 【Major Equipment in the Chemical Equipment Industry】 https://bbs.hcbbs.com/thread-3312079-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum) Summary post discussing the components of cracking furnace equipment for 【Ethylene Cracking】 https://bbs.hcbbs.com/thread-3308724-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum)