Method for fetching broken bolts from bolt holes

A technology of bolt holes and bolts, which is applied in the technical field of taking out broken bolts in mechanical equipment, can solve the problems of difficult drilling operations and difficult drilling operations, and achieve the effect of reducing the damage probability of the body thread and restoring safe and stable operation

Inactive Publication Date: 2013-12-18
JILIN LONGYUAN WIND POWER GENERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The technical problem to be solved by the present invention is to provide a method for taking out a broken bolt from a threaded hole. Bolt drilling, when the space is narrow or the center position of the broken bolt cannot be determined, it is difficult to carry out the drilling operation or the defect that the drilling operation is extremely difficult

Method used

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  • Method for fetching broken bolts from bolt holes
  • Method for fetching broken bolts from bolt holes
  • Method for fetching broken bolts from bolt holes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present invention is a method for taking out a broken bolt from a bolt hole. When the section of the broken bolt is a slope with a slope, the inner diameter of the thread of the broken bolt is set to D 1 10 mm, removing the broken bolt involves the following steps:

[0050] Step (1), select the outer diameter smaller than the broken bolt thread inner diameter D 1 3 mm (the outer diameter of the steel pipe is 7 mm), the wall thickness is the inner diameter of the broken bolt thread D 1 15% of the steel pipe (that is, the outer diameter of the steel pipe is 1.5 mm), the length L of the steel pipe is taken to be 80 mm higher than the end face of the body with the bolt hole after one end of the steel pipe is in contact with the broken bolt section. length; the outer diameter of the steel pipe is set as D 2 ,D 2 ,D 2 / D 1 *100%≈70%.

[0051] Step (2), take a piece of plasticine with toughness and plasticity with a volume to fill the bolt hole and 40mm higher than ...

Embodiment 2

[0057] The present invention is a method for taking out a broken bolt from a bolt hole. When the section of the broken bolt is a slope with a slope, the inner diameter of the thread of the broken bolt is set to D 1 10 mm, removing the broken bolt involves the following steps:

[0058] Step (1), select the outer diameter smaller than the broken bolt thread inner diameter D 1 1 mm (the outer diameter of the steel pipe is), the wall thickness is the inner diameter of the broken bolt thread D 1 25% of the steel pipe (that is, the outer diameter of the steel pipe is 2.5 mm), the length L of the steel pipe is taken to be 80 mm higher than the end face of the body with the bolt hole after one end of the steel pipe is in contact with the broken bolt section. length; where the outer diameter of the steel pipe is set as D 2 , which satisfies D 2 / D 1 *100%≈90%;

[0059] Step (2), take a piece of plasticine with toughness and plasticity with a volume to fill the bolt hole and 60 mm...

Embodiment 3

[0064] The present invention is a method for taking out a broken bolt from a bolt hole. When the section of the broken bolt is a slope with a slope, the inner diameter of the thread of the broken bolt is set to D 1 For 10 mm include the following steps:

[0065] Step (1), select the outer diameter smaller than the broken bolt thread inner diameter D 1 2 mm (the outer diameter of the steel pipe is), the wall thickness is the inner diameter of the broken bolt thread D 1 20% of the steel pipe (that is, the outer diameter of the steel pipe is 2.0 mm), the length L of the steel pipe is taken to be 100 mm higher than the end face of the body with the bolt hole after one end of the steel pipe is in contact with the broken bolt section. length; where the outer diameter of the steel pipe is set as D 2 , which satisfies D 2 / D 1 *100%≈80%;

[0066] Step (2), take a piece of plasticine with toughness and plasticity with a volume to fill the bolt hole and 50mm higher than the end fa...

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Abstract

The invention relates to a method for fetching broken bolts from bolt holes. The method includes steps of selecting a steel tube; pressing plastic clay into a bolt hole with the corresponding broken bolt, compacting the plastic clay and then fetching the plastic clay; grinding the outer wall of one end of the steel tube to so that the shape of the ground outer wall of the end of the steel tube is identical or similar to that of the cross section of the broken bolt according to a shape which is printed on the plastic clay and corresponds to the cross section of the broken bolt, and grinding an oblique surface with an oblique angle ranging from 60 degrees to 80 degrees on a circle of the inner wall of the steel tube; placing the machined steel tube into the bolt hole, firmly welding the steel tube with an end surface of the bolt and finally fetching the broken bolt by the aid of a tool with high clamping force. The outer diameter of the steel tube is smaller than the inner diameter D1 of threads of the broken bolt, the wall thickness of the steel tube is 15-25% of the inner diameter D1 of the threads of the broken bolt, and the outer diameter D2 of the steel tube meets the condition that D2/D1X100% is within the range from 70% to 90%. The method has the advantages that the broken bolt can be fetched without perforation, and accordingly the damage probability of the threads of a body of the broken bolt due to perforation can be effectively reduced; the broken bolt fetching difficulty can be reduced, the broken bolt fetching time can be effectively shortened, and safe and stable running of corresponding equipment can be timely restored.

Description

technical field [0001] The invention relates to a method for taking out broken bolts from threaded holes, and belongs to the field of taking out broken bolts in mechanical equipment. Background technique [0002] Currently for larger diameters (internal thread diameter D 1 ≥10mm) of the broken bolt, according to whether the broken bolt is higher than the body, whether the exposed part of the broken bolt can be clamped with a tool with strong clamping force (such as large pliers, hand-held vise), loosen and take out the broken bolt will take out the broken bolt Processes fall into two categories: [0003] 1. The broken bolt is higher than the body, and it can be taken out with a tool with strong clamping force. [0004] If the broken bolt is higher than the body, first use metal derusting, lubricant (or kerosene) to soak the thread fit, after a certain period of time, use a hand hammer, copper rod, etc. Then use a tool with strong clamping force to clamp the exposed part o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B27/18
Inventor 尹佐明田雨时王琦腾依海张沛刚
Owner JILIN LONGYUAN WIND POWER GENERATION
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