CN216621955U

CN216621955U - Device for assisting in sleeving rubber band or O-shaped ring in triaxial test

Info

Publication number: CN216621955U
Application number: CN202123374128.9U
Authority: CN
Inventors: 禹艳阳; 刘恩龙; 陈燕斌; 叶霞
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-05-27
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a device for assisting in sleeving a rubber band or an O-shaped ring in a triaxial test. The device comprises a sleeve, a hand support and a spring; the sleeve is defined by two symmetrical semi-cylinders, the size of the sleeve is matched with a test piece of a triaxial test, so that the sleeve can be sleeved outside the test piece; the hand supports are two symmetrical L-shaped arms, and the two hand supports are superposed at the inflection point of the L shape and can be mutually and rotatably connected together through a rotating shaft; the rotating shaft is used as a boundary, one side of each of the two hand supports is a handheld part, the other side of each of the two hand supports is a force application part, and the end parts of the two force application parts are respectively fixed on the two semi-cylinders; the arms of the two hand supports are provided with springs for connecting the two arms, and the opening and closing of the two semi-cylinders are controlled by the tension of the hand supports and the springs. The utility model overcomes the problems of labor waste and easy disturbance to the sample when the rubber band or the O-shaped ring is sleeved manually, thereby completing the operation of sleeving the rubber band and the O-shaped ring conveniently, labor-saving and efficiently.

Description

Device for assisting in sleeving rubber band or O-shaped ring in triaxial test

Technical Field

The utility model belongs to the technical field of geotechnical test instruments and equipment, and particularly relates to a device for assisting in sleeving a rubber band and an O-shaped ring in a geotechnical triaxial test.

Background

In the process of civil engineering practice and theoretical research, the triaxial compression test is an important geotechnical test for measuring the strength parameters of soil and researching the mechanical properties of soil. The triaxial apparatus mainly includes a stress control type triaxial apparatus, a strain control type triaxial apparatus, a dynamic triaxial apparatus and the like according to different loading modes. According to different drainage conditions, an unconsolidated and non-drainage shear triaxial test, a consolidated and non-drainage shear triaxial test and a consolidated drainage shear triaxial test can be carried out.

No matter the stress control type triaxial apparatus and the strain control type triaxial apparatus or the triaxial apparatus and the dynamic triaxial apparatus, the installation flow of the sample is basically consistent. Two essential steps in the mounting process are the sealing of the test piece with a rubber membrane to prevent water (gas or oil) in the pressure chamber from entering the test piece. In the sealing process, the lower end of the rubber film needs to be fastened on the base of the pressure chamber, and the upper end of the rubber film needs to be fastened on the sample cap. The fastening is usually done by manually putting rubber bands or O-rings. When the rubber band and the O-shaped ring are manually sleeved, because the rubber band and the O-shaped ring have larger elasticity, the installation is difficult and difficult to control, and the sample is easy to generate larger disturbance, so that the test result is influenced. Therefore, it is necessary to research a device for assisting in sleeving the rubber band or the O-ring so as to efficiently, conveniently and laborsavingly complete the operation of sleeving the rubber band and the O-ring and reduce the disturbance to the sample.

Disclosure of Invention

The utility model aims to provide a device for assisting in sleeving a rubber band or an O-shaped ring in a triaxial test, aiming at overcoming the problems that manual sleeving of the rubber band or the O-shaped ring is labor-consuming and easy to disturb a sample, so that the operation of sleeving the rubber band and the O-shaped ring can be conveniently, labor-saving and efficiently completed.

The device for assisting in sleeving the rubber band or the O-shaped ring in the triaxial test comprises a sleeve, a hand support and a spring; the sleeve is defined by two symmetrical semi-cylinders, the size of the sleeve is matched with a test piece of a triaxial test, so that the sleeve can be sleeved outside the test piece; the hand supports are two symmetrical L-shaped arms, and the two hand supports are superposed at the inflection point of the L shape and can be mutually and rotatably connected together through a rotating shaft; the rotating shaft is used as a boundary, one side of each of the two hand supports is a handheld part, the other side of each of the two hand supports is a force application part, and the end parts of the two force application parts are respectively fixed on the two semi-cylinders; the arms of the two hand supports are provided with springs for connecting the two arms, and the opening and closing of the two semi-cylinders are controlled by the tension of the hand supports and the springs.

Further, the outer wall surfaces of the two tube openings of the sleeve are set to be shrinkage arc surfaces inclined towards the inner wall surface of the sleeve to form shrinkage openings (equivalent to the side surfaces of the circular truncated cones). The purpose of this arrangement is to make it more convenient and smooth to slide the rubber band or O-ring from the sleeve to the position to be tightened when the rubber band or O-ring is sleeved.

Further, the transition end surfaces from the outer walls to the inner walls of the two openings of the sleeve are provided with smooth transition arc surfaces, preferably arc surfaces, which is also convenient for sliding when a rubber band or an O-shaped ring is sleeved.

Further, the rotating shaft is a riveting steel buckle. The material can be alloy steel material.

Furthermore, the two ends of the spring are provided with drag hooks, hanging rings are arranged on the two L-shaped walls, and the drag hooks are hung on the hanging rings to realize the linkage of the two L-shaped arms.

Further, the elasticity and the length of spring satisfy under the condition (under the natural state) of not handing the application of force, and the spring is in tensile state, holds two L types that prop to the trend of drawing close through the pulling force with the hand to use two semicylinders of sleeve closely closed, thereby can overlap on the test piece firmly.

Furthermore, the end parts of the two force application parts of the hand support are symmetrically fixed at the axial middle position of the sleeve body (namely, at the half height of the sleeve), and the plane of the hand support is parallel to the plane of the opening part of the sleeve.

Furthermore, a handle convenient to hold is arranged on the hand-holding part of the hand support. Preferably, the handle is formed by bending the end of the hand-held portion into a ring shape.

Further, the inner diameter of the sleeve is equal to the outer diameter of the sample plus 3mm, and the height is 3-6 cm.

In the utility model, the wall thickness of the sleeve and the thickness of the hand support are determined according to the strength and the rigidity of the selected material, and the material needs to be selected from materials with high rigidity, high strength and low density on the basis that the sleeve is not obviously deformed in the use process. The riveting steel button is made of alloy steel materials, and the spring is made of an extension spring. The diameter and height of the sleeve are adjusted according to the size of the sample, the rubber band and the O-shaped ring, the inner diameter of the sleeve is equal to the diameter of the size of the sample plus 3mm, and the height is 3-6cm according to the size of the sample.

The novel using method comprises the following steps: sleeving the rubber band or the O-shaped ring on a sleeve barrel body, sleeving the sleeve on a sample installed on the base, and slightly moving the rubber band or the O-shaped ring to a band-pricking position along a slope of a sleeve opening part, namely, the base and the sample cap part, so that the band-pricking operation is completed. After the sleeve is tied, the hand support is held by hands, and the sleeve is taken down after the hand support is pinched with force. When the rubber band or the O-shaped ring at the base position is bound, the top sample cap is not installed, so that the requirement of sequence is absent. For the consolidation drainage and consolidation non-drainage tests, due to the existence of the upper drainage pipe, a sleeve which is pre-sleeved with a rubber band or an O-shaped ring is required to be sleeved on a sample, a top sample cap is installed, and then the subsequent operation is carried out.

The working principle of the utility model is as follows: the rubber band or the O-shaped ring is pre-stretched by the cylinder, and the end of the cylinder is designed into an inclined plane and a circular arc, so that the rubber band or the O-shaped ring is conveniently smeared, and the disturbance to a sample is reduced. The sleeve is designed by cutting into two halves along the diameter so as to be convenient for taking out the sleeve after a rubber band on the top sample cap is installed. The lever principle is utilized, and two L-shaped hand supports and an extension spring which are riveted together by rivet steel buckles are adopted to control the opening and closing of the connecting sleeves.

Compared with the prior art, the novel beneficial effect that has of this use:

the device not only can conveniently and quickly sleeve the rubber band or the O-shaped ring, but also has the advantages of simple structure, low cost, convenient operation and strong practicability, saves time and labor, can reduce the disturbance to the sample to a great extent, and improves the reliability of the test result.

Drawings

FIG. 1 is a front view of an apparatus for assisting in the sleeving of a rubber band and an O-ring in a triaxial test according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view of the sleeve taken along a diameter thereof;

FIG. 4 is a schematic view of a state of a split of several components of the device for assisting in sleeving the rubber band and the O-shaped ring in the triaxial test of the utility model;

in the figure, 1 is a sleeve, 2 is a hand support, 3 is a handle, 4 is a rotating shaft, 5 is a spring, and 6 is a hanging ring.

Detailed Description

The utility model is further illustrated by the following examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can implement the present invention with a few insubstantial modifications and variations thereof based on the above disclosure and other embodiments, still falling within the scope of the present invention.

Example 1

The device for assisting in sleeving the rubber band and the O-shaped ring in the triaxial test is shown in fig. 1-4 and comprises a sleeve 1, a hand support 2 and a spring 5. The sleeve is enclosed by two symmetrical semi-cylinders, and the size of the sleeve is matched with a test piece of a triaxial test, so that the sleeve can be sleeved outside the test piece. The hand supports are two symmetrical L-shaped arms, and the two hand supports are superposed at the inflection point of the L shape and can be mutually and rotatably connected together through the rotating shaft 4. The rotating shaft 4 is a riveting steel buckle. The riveting steel buckle is used as a boundary, one side of each of the two hand supports is a handheld part, the other side of each of the two hand supports is a force application part, the end parts of the two force application parts are symmetrically welded and fixed on the two semi-cylinders respectively, the fixing point is located at the axial middle position of the sleeve cylinder body (namely, the half height position of the sleeve cylinder height), and the plane where the hand supports are located is parallel to the plane of the opening part of the sleeve cylinder. The arms of the two hand supports are provided with springs for connecting the two arms, and the opening and closing of the two semi-cylinders are controlled by the tension of the hand supports and the springs. The two ends of the spring are provided with drag hooks, hanging rings 6 are arranged on the two L-shaped walls, and the drag hooks are hung on the hanging rings to realize the linkage of the two L-shaped arms.

The outer wall surfaces of the two tube openings of the sleeve are set to be inclined contraction arc surfaces towards the inner wall surface of the sleeve to form contraction openings (equivalent to the side surfaces of the round tables), and the transition end surfaces from the outer walls of the two tube openings to the inner wall are set to be smooth transition arc surfaces. The purpose of this arrangement is to make it more convenient and smooth to slide the rubber band or O-ring from the sleeve to the position to be tightened when the rubber band or O-ring is sleeved.

Elasticity and length of spring satisfy under the condition (under the natural state) of not handing the application of force, the spring is in tensile state, hold two L types that the hand propped through the pulling force to the trend of drawing close to use two semicircles of sleeve closely closed, thereby can overlap firmly on the test piece

The hand-held part of hand brace sets up the handle that makes things convenient for to hold, the handle is the tip bending ring form of hand-held part and forms.

The wall thickness of the sleeve and the thickness of the hand support are determined according to the strength and the rigidity of the selected material, and the material is a material with high rigidity, high strength and low density on the basis that the sleeve is not obviously deformed in the using process. The riveting steel button is made of alloy steel materials, and the spring is made of an extension spring. The diameter and height of the sleeve are adjusted according to the size of the sample, the rubber band and the O-shaped ring, the inner diameter of the sleeve is equal to the diameter of the size of the sample plus 3mm, and the height is 3-6cm according to the size of the sample.

Claims

1. A device for assisting in sleeving a rubber band or an O-shaped ring in a triaxial test is characterized by comprising a sleeve (1), a hand support (2) and a spring (5); the sleeve is defined by two symmetrical semi-cylinders, the size of the sleeve is matched with a test piece of a triaxial test, so that the sleeve can be sleeved outside the test piece; the hand supports are two symmetrical L-shaped arms, and the two hand supports are superposed at the inflection point of the L shape and can be mutually and rotatably connected together through a rotating shaft (4); the rotating shaft is used as a boundary, one side of each of the two hand supports is a handheld part, the other side of each of the two hand supports is a force application part, and the end parts of the two force application parts are respectively fixed on the two semi-cylinders; the arms of the two hand supports are provided with springs for connecting the two arms, and the opening and closing of the two semi-cylinders are controlled by the tension of the hand supports and the springs.

2. The device as claimed in claim 1, wherein the outer wall surfaces of the two mouths of the sleeve are provided with contraction arc surfaces inclined towards the inner wall surface of the sleeve to form the contraction mouths.

3. The device according to claim 2, wherein the transition end surface from the outer wall to the inner wall of the two mouths of the sleeve is provided with a smooth transition cambered surface.

4. The apparatus of claim 1, wherein the shaft is a riveted steel button.

5. The device according to claim 1, characterized in that the two ends of the spring are provided with draw hooks, the two L-shaped walls are provided with hanging rings (6), and the draw hooks are hung on the hanging rings to realize the connection of the two L-shaped walls.

6. The device of claim 1, wherein the spring has a length and a spring force such that the spring is in a stretched state without applying a force by hand, and the two L-shaped parts of the hand support are pulled toward the direction of closing by the pulling force, so that the two half cylinders of the sleeve are tightly closed.

7. The device of claim 1, wherein the end parts of the two force application parts of the hand support are symmetrically fixed at the axial middle position on the sleeve barrel body, and the plane of the hand support is parallel to the plane of the mouth part of the sleeve.

8. The device according to claim 1, characterized in that the hand-held part of the hand support is provided with a handle (3) for facilitating hand holding.

9. The device of claim 8, wherein the handle is formed by bending an end of the handle into a ring shape.

10. The apparatus of claim 1, wherein the sleeve has an inner diameter dimension equal to the outer diameter dimension of the sample plus 3mm and a height of 3-6 cm.