Hydraulic and spring combination device with position-limit spring for rock sample

Patent metadata

Field	Value
Publication number	US-9488559-B2
Application number	US-201615015086-A
Country	US
Kind code	B2
Filing date	Feb 3, 2016
Priority date	Feb 9, 2015
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A device for fixing a rock sample, the device including: a lower clamp and an upper clamp. The lower clamp includes: a lower connector connected to a bottom loading base, a lower end cap for fixing samples, a lower chain connecting the lower connector and the lower end cap, a first spiral spring, a first central position-limit mechanism, a second central position-limit mechanism, and a first hydraulic mechanism. The lower end cap includes: a first sample fixing groove and a first connecting segment. The upper clamp includes: an upper connector connected to a top loading base, an upper end cap for fixing the samples, an upper chain connecting with the upper connector and the upper end cap, a second spiral spring, a third central position-limit mechanism, fourth central position-limit mechanism, and a second hydraulic mechanism. The upper end cap includes: a second sample fixing groove and a second connecting segment.

First claim

The invention claimed is:

1. A device for fixing a rock sample, the device comprising:
a) a lower clamp, the lower clamp comprising: a lower connector connected to a bottom loading base of a testing machine, a lower end cap for fixing samples, a lower chain connecting the lower connector and the lower end cap, a first spiral spring, a first central position-limit mechanism, a second central position-limit mechanism, and a first hydraulic mechanism; the lower end cap comprising: a first sample fixing groove and a first connecting segment;
b) an upper clamp, the upper clamp comprising: an upper connector connected to a top loading base of the testing machine, an upper end cap for fixing the samples, an upper chain connecting with the upper connector and the upper end cap, a second spiral spring, a third central position-limit mechanism, a fourth central position-limit mechanism, and a second hydraulic mechanism; the upper end cap comprising: a second sample fixing groove and a second connecting segment;

wherein
the first central position-limit mechanism, the second central position-limit mechanism, the third central position-limit mechanism, and the fourth central position-limit mechanism have the same structure and each central position-limit mechanism comprises: a position-limit spring assembly, supports, and a connecting plate; each position-limit spring assembly comprises: a circular support base, three screws, three threaded inserts provided with male threads and female threads, three position-limit springs, and three position-limit bodies; three screw holes provided with female threads are disposed on a wall of the circular support base; center lines of the three screw holes all pass through a center of the circular support base; an angle between the center lines of neighboring screw holes is 120°; the female threads of the three screw holes match the male threads of the threaded inserts; the female threads of the threaded inserts match male threads of the screws; the position-limit bodies are provided with threaded holes, and female threads of the threaded holes match the male threads of the screws; one ends of the supports are connected to the connecting plate, and the other ends of the supports are connected to the circular support base of the position-limit spring assembly; the three threaded inserts are respectively disposed in the three screw holes of the circular support base; the three screws are assembled with the three threaded inserts respectively; the three position-limit bodies are disposed on the three screws respectively; the three position-limit springs are nested outside the three screws respectively; one ends of the springs contact the position-limit bodies disposed on the screws; and the other ends of the springs contact an internal wall of the circular support base;
the first hydraulic mechanism and the second hydraulic mechanism have the same structure, and each of the first hydraulic mechanism and the second hydraulic mechanism comprises: circular pistons and circular oil cylinders fitting with the circular pistons respectively;
the first central position-limit mechanism and the bottom loading base of the testing machine are assembled; the circular support base of the position-limit spring assembly in the first central position-limit mechanism contacts the bottom loading base of the testing machine; the lower connector is disposed in a center hole of the circular support base; one ends of the three screws of the position-limit spring assembly in the first central position-limit mechanism contact an external side of the lower connector respectively; the second central position-limit mechanism and the lower end cap are assembled; the circular support base of the position-limit spring assembly in the second central position-limit mechanism contacts an outer bottom wall of the first sample fixing groove of the lower end cap; the first connecting segment of the lower end cap is disposed in the center hole of the circular support base; one ends of the three screws of the position-limit spring assembly in the second central position-limit mechanism contact an external side of the first connecting segment of the lower end cap; the first hydraulic mechanism and the first central position-limit mechanism are assembled; the circular oil cylinders of the first hydraulic mechanism are connected to the connecting plate of the first central position-limit mechanism; one end of the first spiral spring is connected to the circular pistons of the first hydraulic mechanism, and the other end of the first spiral spring is connected to the connecting plate of the second central position-limit mechanism; the lower chain is disposed in a space enclosed by the first central position-limit mechanism, the first hydraulic mechanism, the first spiral spring, and the second central position-limit mechanism; and
the third central position-limit mechanism and the upper end cap are assembled; the circular support base of the position-limit spring assembly in the third central position-limit mechanism contacts an outer bottom wall of the second sample fixing groove of the upper end cap; the second connecting segment of the upper end cap is disposed in the center hole of the circular support base; one ends of the three screws of the position-limit spring assembly in the third central position-limit mechanism respectively contact an external side of the second connecting segment of the upper end cap; the fourth central position-limit mechanism and the top loading base of the testing machine are assembled; the circular support base of the position-limit spring assembly in the fourth central position-limit mechanism contacts the top loading base of the testing machine; the upper connector is disposed in the center hole of the circular support; one ends of the three screws of the position-limit spring assembly in the fourth central position-limit mechanism respectively contact an outer side of the upper connector; the second hydraulic mechanism and the third central position-limit mechanism are assembled; the circular oil cylinders of the second hydraulic mechanism are connected to the connecting plate of the third central position-limit mechanism; one end of the second spiral spring is connected to the circular pistons of the second hydraulic mechanism, and the other end of the second spiral spring is connected to the connecting plate of the fourth central position-limit mechanism; the upper chain is disposed in a space enclosed by the third central position-limit mechanism, the second hydraulic mechanism, the second spiral spring, and the fourth central position-limit mechanism.

2. The device of claim 1 , wherein in the first central position-limit mechanism, the second central position-limit mechanism, the third central position-limit mechanism, and the fourth central position-limit mechanism, the supports are four round rods; the connecting plate is a circular plate; the four round rods are uniformly mounted between the circular support base and a circular surface of the connecting plate.

3. The device of claim 1 , wherein in the first central position-limit mechanism, the second central position-limit mechanism, the third central position-limit mechanism, and the fourth central position-limit mechanism, the supports are two boards having a circular-arc cross section; the connecting plate is a circular plate; the two boards are symmetrically mounted between the circular support base and a circular surface of the connecting plate.

Assignees

• Univ Sichuan

Inventors

• Liu Jianfeng
• Pei Jianliang
• Xu Huining
• Wang Lu
• Zhou Zhiwei
• Zhuo Yue
• Dai Feng
• Fu Wenxi

Classifications

• G01N3/08 Primary

  by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title

• G01N2203/0447

  Holders for quick insertion/removal of test pieces · CPC title

• G01N3/04

  Chucks · CPC title

• G01N2203/0405

  Features allowing alignment between specimen and chucks · CPC title