Machining method of drilling platform lifting tower
A lifting tower and machining technology, which is applied in the field of offshore drilling equipment, can solve the problems such as the large volume of the lifting tower and the inability of the height of the milling cutter to meet the one-time machining of the lifting tower, and achieve the effect of reducing the requirements.
Active Publication Date: 2011-05-25
CHINA MERCHANTS HEAVY IND JIANGSU +1
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Problems solved by technology
[0008] 3. The 3 sets of lifting units corresponding to each lifting tower are jointly stressed to make the hull lift on the leg rack. Since the tooth pitch of the rack is the same, the distance between the 3 sets of lifting units must be guaranteed
[0009] Due to the large volume of the lifting tower, the size is 4620mm (width) x 4754mm (height), which puts forward great requirements on the ability of the machining machine tool, which can be used for 9 concentric support round holes and transitions of 3 driving wheels / driven wheels at one time. There are very few manufacturers for machining the lifting tower, and the height of the milling cutters of the existing machine tools in many shipyards cannot meet the one-time machining of the entire lifting tower.
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[0031] The present invention will be further described in detail below through embodiments in conjunction with the accompanying drawings.
[0032] Please refer to Figure 1-2 , the lifting tower 5 of the drilling platform in one embodiment is arranged side by side along its height direction (ie the lifting direction) with 3 groups of driving wheel series supporting round holes 1, transition wheel series supporting round holes 2 and driven wheel series supporting round holes 3 , each group corresponds to 1 set of lifting unit, and each set of lifting unit is provided with 3 layers of support plates (a part of the gear box). There are 3 supporting round holes, which are respectively located on one of the supporting plates. The supporting round holes of the transition wheel series in each group have 2 supporting round holes, which are respectively located on the 2 outer supporting plates. One set of series supporting round holes corresponds to one set of lifting unit, among whic...
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Abstract
The invention discloses a machining method of a drilling platform lifting tower, which comprises the following steps: milling the end face of a supporting circular hole of a previous reference bedding surface of the lifting tower under the condition that the lifting tower is horizontal relative to a tool, rotating the lifting tower for 180 degrees to turn around the lifting tower after the milling, and processing the end face of an unprocessed supporting circular hole within the identical milling range of the tool, thereby obtaining a reference plane; drawing a marker for boring based on the reference plane; and boring serial supporting circular holes on part of the previous bedding surface of the lifting tower under the condition that the lifting tower is vertical relative to the tool, rotating the lifting tower for 180 degrees to turn around the lifting tower after the boring, and processing serial supporting circular holes of the unprocessed part within the identical boring range of the tool. Therefore, the invention realizes the purpose of processing the large-size lifting tower through a small-size tool for one-time processing, thereby reducing the requirements for the machining tool.
Description
technical field [0001] The invention relates to ocean drilling equipment, in particular to a machining method for a lifting tower of a drilling platform. Background technique [0002] Drilling ship is a drilling device used for offshore oil and gas exploration and exploitation engineering operations. For example, Haiyang Shiyou 936 is suitable for drilling operations in various sea environment conditions within a water depth of 15 to 91.4 meters worldwide. The drilling ship has a strong offshore operation capability. The maximum drilling variable load is 3,500 tons when the maximum operating water depth is 91.4 meters, and the maximum drilling operation depth can reach 9,144 meters. [0003] The jack-up drilling platform of the drilling ship is equipped with 54 sets of lifting devices, and each set of lifting devices includes pinions, gearboxes, motors and brakes. The lifting device will be responsible for lifting the weight of the whole ship at a certain height to overcom...
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IPC IPC(8): B23P15/00
Inventor 刘建成孙俭孚
Owner CHINA MERCHANTS HEAVY IND JIANGSU