CN202420961U - Pressure transmission solid pre-loading mechanism for high temperature triaxial test - Google Patents

Abstract

A high-temperature triaxial test pressure transmission solid pre-installation mechanism, the pre-installation mechanism is mainly composed of a high-temperature pressure chamber, a central cylinder pressure head, a side cylinder pressure head, a bottom cylinder pressure head, an axial pressure head, a surrounding pressure sleeve, an upper pressure head, a lower Indenter composition. The head of the bottom cylinder is located below the high-temperature pressure chamber, and its diameter is slightly smaller than the diameter of the high-temperature pressure chamber, so it can pass through the high-temperature pressure chamber; the head of the side cylinder and the head of the central cylinder are located above the high-temperature pressure chamber, and the head of the side cylinder has an annular outer diameter , which is slightly smaller than the diameter of the high-temperature pressure chamber and can pass through the high-temperature pressure chamber; the head of the central cylinder is located inside the head of the side cylinder and can pass through the head of the side cylinder. The pressure head of the bottom cylinder supports the experimental sample and the pressure-transmitting solid, the pressure head of the central cylinder presses and fixes the experimental sample, and the pressure-transmitting solid is compacted by repeated loading of the pressure head of the side cylinder, which improves the preloading speed of the pressure-transmitting solid. The pressure-transmitting solid is dense and solid, which reduces the compressibility and improves the accuracy of the experiment. It has compact and simple structure, easy operation, convenient pre-installation, and good insulation and heat insulation effects.

Description

A high-temperature triaxial test pressure transmission solid preloading mechanism

technical field

The utility model relates to a high-temperature triaxial test pressure transmission solid preloading mechanism, which is especially suitable for high-temperature and high-pressure triaxial tests. the

Background technique

The development of rock mechanics has always been accompanied by the development of testing machines and gradually independent of material mechanics, and has developed, grown and matured. In the early days, the tests of rock mechanics completely used ordinary material testing machines. Later, with the successful development of various large-scale rigid testing machines, a large number of related experimental researches were carried out, revealing many little-known characteristics of rocks and rock masses, which greatly promoted It has promoted the development of the subject of rock mechanics and has become an emerging subject that has an important impact on the national economy. As a kind of large-scale rigid testing machine, the confining pressure triaxial testing machine has played an irreplaceable role. Its specimen size is large and its functions are diversified, but the pre-installation process of its pressure-transmitting solid is very difficult, especially when insulation is required. with thermal insulation case. the

Contents of the invention

Technical problem: The purpose of this utility model is to overcome the deficiencies in the prior art and provide a solid pre-installation mechanism with simple structure, convenient pre-installation, and good insulation and heat insulation effects in high-temperature triaxial test pressure transmission. the

Technical solution: This utility model high-temperature triaxial test pressure transmission solid pre-installation mechanism, which includes a high-temperature pressure chamber, an axial pressure head, a surrounding pressure sleeve, a lower pressure head, and an upper pressure head. The cylindrical cavity of the pressure chamber, the bottom of the high-temperature pressure chamber is located at the lower orifice of the cylindrical cavity, and there is a bottom cylinder pressure head that is slidingly matched with the cylindrical cavity. The stroke of the bottom cylinder pressure head can run through the entire high-temperature pressure chamber; The top of the pressure chamber is located at the upper orifice of the cylindrical cavity of the high-temperature pressure chamber, and a hollow side cylinder pressure head slidingly fitted with the cylindrical cavity is provided, and a central cylinder pressure head is provided in the hollow diameter inner gap of the hollow side cylinder pressure head; The lower side of the high temperature pressure chamber is provided with a radial limit hole. the

The hollow side cylinder indenter is composed of an annular indenter and 4 ribs, and a plurality of guide grooves are arranged on the circumference of the annular indenter; the hollow diameter of the hollow side cylinder indenter is 220 mm; A fixing hole with the same diameter as the radial limit hole on the lower side of the high temperature pressure chamber is opened on the side wall of the pressure sleeve. the

Beneficial effects: due to the adoption of the above technical scheme, the utility model effectively reduces the labor load of personnel, improves the preloading speed of the pressure transmitting solid, and the preloaded pressure transmitting solid is dense and solid, reduces the compressible amount, and greatly Improved experimental precision. The utility model has the advantages of compact and simple structure, easy operation, convenient pre-installation, good insulation and heat insulation effect, and wide practicability. the

Description of drawings

Figure 1 is a schematic structural diagram of the side pressure pre-installation mechanism of the utility model;

Figure 2 is a schematic structural diagram of the side pressure cylinder of the present invention;

Fig. 3 is the A-A sectional structure diagram of Fig. 2;

Fig. 4 is a schematic diagram of the structure of the confining pressure sleeve of the present invention.

In the figure: 1-high temperature pressure chamber; 2-limiting hole; 3-axis pressure head; 4-containing pressure sleeve; 4--1 fixing hole; 5-lower pressure head; ;8-hollow side cylinder pressure head; 8-1-side pressure head; 8-2-fin; 8-3-guide, 9-pyrophyllite powder; 10-salt; 11-central cylinder pressure head; 12- Bottom cylinder pressure head; 13-copper cooling pipe. the

Detailed ways

An embodiment of the present utility model is further described below in conjunction with accompanying drawing:

As shown in Figure 1, the high-temperature triaxial test pressure transmission solid preloading mechanism of the present utility model is mainly composed of a high-temperature pressure chamber 1, an axial pressure head 3, a surrounding pressure sleeve 4, a lower pressure head 5, and an upper pressure head 7. The high-temperature pressure chamber 1 described above is provided with a cylindrical cavity that runs through the high-temperature pressure chamber 1, and the bottom of the high-temperature pressure chamber 1 is located at the lower orifice of the cylindrical cavity, and a bottom cylinder pressure head 12 that is slidingly fitted with the cylindrical cavity , the bottom cylinder head 12 strokes can run through the entire high-temperature pressure chamber 1; the top of the high-temperature pressure chamber 1 is located at the upper orifice of the cylindrical cavity of the high-temperature pressure chamber 1, and a hollow side cylinder head 8 that is slidingly matched with the cylindrical cavity is provided. , the hollow side cylinder pressure head 8 is made of ring pressure head 8-1, 4 ribs 8-2, and the circumference of ring pressure head 8-1 is provided with a plurality of guide grooves 8-3, and the hollow side cylinder pressure head 8 The hollow diameter is 220mm, as shown in Figure 2 and Figure 3. A central cylinder head 11 is provided in the hollow diameter inner gap of the hollow side cylinder head 8 ; a radial limit hole 2 is opened on the lower side of the high temperature pressure chamber 1 . The bottom cylinder pressure head 12 is located at the lower part of the inner cavity of the high-temperature pressure chamber 1, and above it are the confining pressure sleeve 4, the axial pressure head 3, the lower pressure head 5, the test sample 6, and the upper pressure head 7. The space enclosed by the axial indenter 3, the lower indenter 5, the test sample 6, the upper indenter 7 and the high-temperature pressure chamber 1 is filled with pyrophyllite powder 9, table salt 10, and pyrophyllite powder 9 from bottom to top. The side pressure cylinder 8 and the center cylinder pressure head 11 are located above the high temperature pressure chamber, which can be loaded from top to bottom, the center cylinder pressure head presses the upper pressure head, and the side pressure cylinder compacts the pressure transmitting solid. The side wall of the confining pressure sleeve 4 is provided with a fixing hole 4-1 having the same diameter as the radial limiting hole 2 on the lower side of the high temperature pressure chamber 1, as shown in FIG. 4 .

Working process: first lower the bottom cylinder pressure head 12 to the lower orifice of the cylindrical cavity of the high temperature pressure chamber 1, apply high temperature grease evenly on the cavity inner wall of the high temperature pressure chamber 1, and then lower the bottom cylinder pressure head 12 liters To the position 20cm below the upper hole of the cylindrical cavity of the high-temperature pressure chamber 1, firstly install the confining pressure sleeve 4 inwardly, and then install the axial pressure head 3 in the confining pressure sleeve 4, and control the lowering of the bottom cylinder pressure head 12, so that the axial pressure head 3 The surface is parallel to the upper surface of the high-temperature pressure chamber 1, and the lower pressure head 5 is placed on the axial pressure head 3, and the bottom cylinder pressure head 12 is lowered again, so that the upper surface of the lower pressure head 5 is parallel to the upper surface of the high-temperature pressure chamber 1, and the test The sample 6 is placed on the lower pressure head 5, and then the bottom cylinder pressure head 12 is lowered again so that the upper surface of the test sample 6 is parallel to the upper surface of the high temperature pressure chamber 1, after that, the upper pressure head 7 is placed on the test sample 6, and the bottom cylinder is raised. Cylinder head 12, so that the experimental sample 6 is completely exposed outside the cavity of high-temperature pressure chamber 1, lower the center cylinder head 11, and observe the movement position of the center cylinder head 11 through the gap between the ribs 8-2, when the center When the cylinder indenter 11 is close to the upper indenter 7, slowly lower the central cylinder indenter 11 until the test sample 6 is pressed and fixed so that it does not shake. Raise the central cylinder pressure head 11, and then raise the bottom cylinder pressure head 12 to 20cm below the upper hole of the cylindrical cavity of the high temperature pressure chamber 1; lower the central cylinder pressure head 11, and pass through the gap between the ribs 8-2 Observe the movement position of the central cylinder head 11. When the center cylinder head 11 is close to the upper head 7, slowly lower the center cylinder head 11 until the test sample 6 is pressed and fixed. Pyrophyllite powder 9 is filled in the space enclosed by the pressure sleeve 4, the axial pressure head 3, the lower pressure head 5, the test sample 6, and the upper pressure head 7 for many times, and each time the pyrophyllite powder 9 is filled through the side pressure cylinder 8 Apply a pressure of 10MPa and keep the pressure for 30 minutes until the enclosed space is filled with lateral pressure solids; make the side cylinder pressure head 8 press the side pressure solids, the bottom cylinder pressure head 12, the center cylinder pressure head 11, and the side pressure cylinder 8 Linkage downward, so that the confining pressure sleeve 4, the axial pressure head 3, the lower pressure head 5, the test sample 6, the upper pressure head 7 and the installed side pressure solids are lowered as a whole, and the pre-installed space is released. On the wall of the high-temperature pressure chamber Install heat-insulating insulating materials, and fill the space surrounded by the high-temperature pressure chamber 1 cavity and the confining pressure sleeve 4, the axial pressure head 3, the lower pressure head 5, the test sample 6, and the upper pressure head 7 for many times. Stone powder 9, every time pyrophyllite powder 9 is filled, apply a pressure of 10 MPa through the side pressure cylinder 8, and keep the pressure for 30 minutes; when the side pressure solid is filled to 2cm below the experimental sample 6, replace the pyrophyllite powder 9 with table salt 10 and continue Filling, during the pre-loading process, when the lateral pressure solid is filled to the lower edge, middle part and upper edge of the experimental sample 6, respectively set a armored thermocouple until the filling exceeds the upper edge of the experimental sample 6 by 2cm, then put 10 Change to pyrophyllite powder 9 and continue filling until it reaches the upper edge of the upper pressure head 7; lower the bottom cylinder pressure head 12 to the position where the fixed hole 4-1 on the confining pressure sleeve 4 and the high temperature pressure chamber 1 Align hole 2, use a pin to pass through the limiting hole from the outside 2 and fixing hole 14, make confining pressure sleeve 4 fix, avoid it to drop, and the installation of pressure transmitting solid is completed. the

Claims (1)

1. a high temperature triaxial test pressure transmission solid is pre-installed mechanism; It comprises high temperature pressure chamber (1), axial compression head (3), confined pressure cover (4), push-down head (5), seaming chuck (7); It is characterized in that: inside, described high temperature pressure chamber (1) is provided with the cylindrical cavity that runs through high temperature pressure chamber (1); The bottom of high temperature pressure chamber (1) is positioned under the cylindrical cavity place, aperture and is provided with the end cylinder pressure head (12) that is slidingly matched with cylindrical cavity, and end cylinder pressure head (12) stroke can run through whole high temperature pressure chamber (1); The top of high temperature pressure chamber (1) is positioned on the cylindrical cavity of high temperature pressure chamber (1) place, aperture and is provided with the hollow side cylinder pressure head (8) that is slidingly matched with cylindrical cavity, and the hollow diameters internal clearance of hollow side cylinder pressure head (8) is provided with central cylinder pressure head (11); Side, below, described high temperature pressure chamber (1) has radially spacing hole (2).

2. high temperature triaxial test pressure transmission solid according to claim 1 is pre-installed mechanism; It is characterized in that: described hollow side cylinder pressure head (8) is made up of annular pressure head (8-1), 4 fins (8-2), and the circumference of annular pressure head (8-1) is provided with a plurality of guide grooves (8-3).

3. high temperature triaxial test pressure transmission solid according to claim 1 and 2 is pre-installed mechanism, and it is characterized in that: the hollow diameters of described hollow side cylinder pressure head (8) is 220mm.

4. high temperature triaxial test pressure transmission solid according to claim 1 prepackage mechanism is characterized in that: have on described confined pressure cover (4) sidewall with high temperature pressure chamber (1) lower side face diameter to the identical fixed orifice (4-1) of spacing hole (2) diameter.

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