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Scribing method for axial center holes of bottom landing leg beams of large-scale gantry crane

A technology of gantry cranes and center lines, which is applied to workshop equipment, manufacturing tools, etc., to achieve the effects of saving purchase costs and special personnel, improving efficiency and saving costs

Inactive Publication Date: 2015-05-20
JIANGSU DATONG HEAVY IND
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  • Application Information

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Problems solved by technology

[0007] Purpose of the invention: The purpose of the invention is to provide a marking method for the central hole of the shaft hole of the bottom beam of the outrigger of a large gantry crane, which can solve the problem of the accuracy of the marking of the shaft hole that is difficult to achieve in the prior art

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  • Scribing method for axial center holes of bottom landing leg beams of large-scale gantry crane
  • Scribing method for axial center holes of bottom landing leg beams of large-scale gantry crane
  • Scribing method for axial center holes of bottom landing leg beams of large-scale gantry crane

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the drawings.

[0031] Operation process: see figure 1 , figure 2

[0032] 1. Rigid legs close up: The rigid leg columns 1 and bottom beams 2 that are qualified as a single piece are closed on the supporting platform. It is required to use a level to level the lower straight plane and cushion it firmly.

[0033] 2. After the closing is qualified, draw the overall longitudinal centerline A on the plane of the rigid leg. On the center line A, determine the point O at the lower plane L1 from the bottom beam; at this point, use theodolite to draw a line B perpendicular to the overall center line A; on the straight line B, draw L2 based on point O Determine points a and b; then use points a and b as benchmarks to draw lines C and D perpendicular to line B with theodolite; draw lines E and B of L3 on lines C and D using points a and b as the benchmarks. Point F; these two points are the center points of th...

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Abstract

Disclosed is a scribing method for axial center holes of bottom landing leg beams of a large-scale gantry crane. The scribing method is implemented by steps of adopting a laser level and a theodolite, folding rigid legs, drawing center points on an upper plane of two axial holes on the plane of the rigid legs after folding is qualified, and drawing center points of a lower plane of the two axial holes by the theodolite. The scribing method for axial center holes of bottom landing leg beams of the large-scale gantry crane has the advantages that by the high-precision theodolite, the problem of scribing accuracy before boring of large structural members is solved, and proved practically, product quality is guaranteed by the above technical scheme.

Description

Technical field [0001] The invention relates to a scribing method, in particular to a scribing method for the central hole of the shaft hole of the bottom beam of a large gantry crane, and belongs to the technical field of crane manufacturing. Background technique [0002] Due to the limitation of the size, volume and weight of structural parts, the boring of structural parts cannot be directly processed on coordinate boring machines, CNC boring machines or CNC floor boring machines. Generally, boring after marking is required. Therefore, the accuracy of marking is directly related to the accuracy of boring. If the error is too large, it will affect the use of the product, increase the maintenance cost, and may seriously shut down and discard it. For example, when the parallelism, perpendicularity, and coaxiality of the center hole of the bottom beam of the outrigger of a large shipbuilding gantry crane are too large, dozens of wheels running on the same rail may chew the rail. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25H7/00
Inventor 王化臣郑镇明王大元
Owner JIANGSU DATONG HEAVY IND
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