Multi-bolt loosening test machine for flange with tension and bending compound loading

Patent metadata

Field	Value
Publication number	US-10620069-B2
Application number	US-201816613404-A
Country	US
Kind code	B2
Filing date	Mar 15, 2018
Priority date	Mar 15, 2018
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

The present invention belongs to the technical field of mechanical test devices, and provides a multi-bolt loosening test machine for flange with tension and bending compound loading, which is a test machine researching the anti-looseness properties of bolts by applying tension, bending and torsion compound loading to multi-bolt connection flanges. The multi-bolt loosening test machine for flange with tension and bending compound loading uses a transverse load generated by a three-phase asynchronous motor as a bending load applied to a flange, uses a tension force generated by a hydraulic puller as an axial tension load, is different from the current device that can apply two compound loads to a single bolt, and can apply two compound loads to the multi-bolt connection flanges. The present invention can isolate two compound loads from each other without interference, and display the applied loads in real time.

First claim

The invention claimed is:

1. A multi-bolt loosening test machine for flange with tension and bending compound loading, the multi-bolt loosening test machine for flange with tension and bending compound loading consisting of two parts: an axial load transmission part and a transverse load transmission part,
wherein the axial load transmission part comprises a bottom clamping plate ( 18 ), a thin specimen ( 19 ), a thick specimen ( 20 ), a specimen bolt ( 21 ), a bearing cap ( 23 ), a thrust ball bearing ( 24 ), a top clamping plate ( 25 ), an axial load bracket ( 26 ) and a hydraulic puller ( 27 ); the bottom clamping plate ( 18 ) and the axial load bracket ( 26 ) are fixed to a base ( 22 ); seam allowances of the thin specimen ( 19 ) and the thick specimen ( 20 ) are correspondingly assembled together, and assembled and fixed in corresponding bolt holes through the specimen bolt ( 21 ); the thin specimen ( 19 ) and the thick specimen ( 20 ) are integrally installed between the bottom clamping plate ( 18 ) and the top clamping plate ( 25 ); an outer hexagonal head of the thin specimen ( 19 ) is installed in an inner hexagonal head of the bottom clamping plate ( 18 ) and is fixed with an inner hexagonal head bolt; the end of the thick specimen ( 20 ) is installed in an inner ring of the top clamping plate ( 25 ) and is fixed with an inner hexagonal head bolt; the bearing cap ( 23 ) penetrates through the top clamping plate ( 25 ), and clamps the thrust ball bearing ( 24 ) between the bearing cap ( 23 ) and the top clamping plate ( 25 ); and one end of a hydraulic pushing pole of the hydraulic puller ( 27 ) is placed in a cylinder on the axial load bracket ( 26 ), and a hook on the hydraulic pushing pole grapples the edge of the bearing cap ( 23 );
the transverse load transmission part comprises an eccentric coupling ( 1 ), a camshaft ( 2 ), an end cap ( 3 ), a cam connecting rod ( 4 ), a hinge pin ( 5 ), a U-type connecting rod ( 6 ), a first linear bearing ( 7 - 1 ), a second linear bearing ( 7 - 2 ), a first support plate ( 8 - 1 ), a second support plate ( 8 - 2 ), a first Φ8.5 pin ( 9 - 1 ), a second Φ8.5 pin ( 9 - 2 ), a third Φ8.5 pin ( 9 - 3 ), an elastic rod ( 10 ), a short threaded part ( 11 ), an adjusting ring ( 12 ), an S-type column tension sensor ( 13 ), a long threaded part ( 14 ), a rotatable head ( 15 ), a tension plate ( 16 ), a limit plate ( 17 ) and a three-phase asynchronous motor ( 28 ); the first support plate ( 8 - 1 ), the second support plate ( 8 - 2 ) and the three-phase asynchronous motor ( 28 ) are fixed to the base ( 22 ); one end of the eccentric coupling ( 1 ) is fixed to a motor shaft of the three-phase asynchronous motor ( 28 ), and the other end is fixed together with the camshaft ( 2 ); the camshaft ( 2 ) is connected together with the cam connecting rod ( 4 ) through a ball bearing, and is sealed with the end cap ( 3 ) for dust prevention; the cam connecting rod ( 4 ) is connected with the U-type connecting rod ( 6 ) through the hinge pin ( 5 ); the first linear bearing ( 7 - 1 ) is fixed into the first support plate ( 8 - 1 ), and the U-type connecting rod ( 6 ) penetrates through the first linear bearing ( 7 - 1 ); one end of the elastic rod ( 10 ) is in hinge joint with the U-type connecting rod ( 6 ) through the first Φ8.5 pin ( 9 - 1 ), and the other end is in hinge joint with one end of the short threaded part ( 11 ) through the second Φ8.5 pin ( 9 - 2 ); the other end of the short threaded part ( 11 ) is in threaded connection with one end of the S-type column tension sensor ( 13 ), and the adjusting ring ( 12 ) is installed therebetween; the other end of the S-type column tension sensor ( 13 ) is in threaded connection with one end of the long threaded part ( 14 ); the second linear bearing ( 7 - 2 ) is fixed into the second support plate ( 8 - 2 ); the other end of the long threaded part ( 14 ) penetrates through the second linear bearing ( 7 - 2 ) and is in hinge joint with the rotatable head ( 15 ) through the third Φ8.5 pin ( 9 - 3 ); the rotatable head ( 15 ) is placed in a U-type groove of the tension plate ( 16 ); the motion of the rotatable head ( 15 ) in the U-type groove of the tension plate ( 16 ) is limited through the limit plate ( 17 ); the tension plate ( 16 ) is sleeved on a middle shaft of the thickness specimen ( 20 ).

2. The multi-bolt loosening test machine for flange with tension and bending compound loading according to claim 1 , wherein the thickness of the adjusting ring ( 12 ) is adjusted according to needs.

Assignees

• Univ Dalian Tech

Inventors

• Sun Qingchao
• Zhang Bao
• Lin Qingyuan
• Sun Wei
• Yang Bin

Classifications

• G01L5/0033

  applying a pulling force · CPC title

• G01M13/04

  Bearings · CPC title

• G01L5/0038

  applying a pushing force · CPC title

• G01L5/24 Primary

  for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed · CPC title

• G01M13/00

  Testing of machine parts · CPC title