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

A gantry crane, center hole technology, applied in workshop equipment, manufacturing tools, etc., to achieve the effect of less auxiliary work, saving purchase cost and dedicated personnel, and improving efficiency

Inactive Publication Date: 2013-08-14
JIANGSU DATONG HEAVY IND
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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 accompanying drawing.

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

[0032] 1. Close up of rigid legs: Close up the qualified rigid leg columns 1 and bottom beams 2 on the supporting platform. It is required to use a level to level the lower straight plane and pad it firmly.

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

[0034] 3. Use theodolite to mark the center...

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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 a center hole of a shaft hole of a bottom beam of a leg 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 the structural parts, when the boring work of the structural parts cannot be directly processed on the coordinate boring machine, CNC boring machine or CNC floor boring machine, it generally needs to be bored after marking. Therefore, the accuracy of scribing 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 even seriously, it may be shut down and scrapped. For example, when the parallelism, perpendicularity, and coaxiality deviation between the center holes of the bottom beam shaft holes of the outrigger legs of a large shipbuilding gantry crane is too...

Claims

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Application Information

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IPC IPC(8): B25H7/00
Inventor 王化臣郑镇明王大元
Owner JIANGSU DATONG HEAVY IND
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