CN215931553U - Confining pressure self-balancing mechanism - Google Patents
Confining pressure self-balancing mechanism Download PDFInfo
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- CN215931553U CN215931553U CN202220063985.2U CN202220063985U CN215931553U CN 215931553 U CN215931553 U CN 215931553U CN 202220063985 U CN202220063985 U CN 202220063985U CN 215931553 U CN215931553 U CN 215931553U
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Abstract
The utility model discloses a confining pressure self-balancing mechanism, belonging to the technical field of pressure test instruments and solving the problem that the accuracy of a test result is influenced because a pressure balancing system of a pressure chamber of a triaxial test machine in the prior art is insufficient in adjustment precision, the upper end of the pressure chamber shell is connected with an axial loading piston, the lower end of the axial loading piston extends into the pressure chamber shell, the bottom end of the axial loading piston is connected with a force transmission column, the bottom of the axial loading piston is connected with a sample cap, a limit measuring flange is arranged on the axial loading piston, the limiting measurement flange is connected with a balance support, the balance support is horizontally arranged, the end of the balance support is connected with a balance piston, the inner wall of the pressure chamber shell is connected with a balance cylinder sleeve in sliding connection with the balance piston, and the inside of the balance cylinder sleeve is communicated with the outside of the pressure chamber shell. The utility model is used for the automatic pressure balance adjustment of the pressure chamber of the coarse-grained soil triaxial testing machine.
Description
Technical Field
The utility model belongs to the technical field of pressure test instruments, and particularly relates to a confining pressure self-balancing mechanism.
Background
A three-axis tester for coarse-grained soil is a relatively perfect device for measuring the shear strength of soil. The working principle is that an axial system applies axial sample force to a sample, and a pressure chamber applies confining pressure to the sample, so that the axial deformation, the radial deformation, the pore water pressure at the upper end and the lower end of the sample and the like of a soil body can be detected.
The triaxial testing machine mainly comprises a main frame, a pressure chamber, a hydraulic servo system, a confining pressure system, a hole pressure and back pressure system, an air pump, a computer control system and the like. Traditional pressure chamber is in experimental, and during loading piston got into the pressure chamber, can arouse confined pressure cavity volume to reduce to make confined pressure increase, the experimental result accuracy reduces, and to balanced cylinder formula triaxial pressure chamber, the pressure in the pressure chamber needs to reach balanced, makes axial test power and confined pressure mutually noninterfere, mutual independence. Therefore, the triaxial testing machine generally uses an air pressure system, and the air pump and other devices are used for adjusting the pressure in the pressure chamber to balance the pressure, however, when the method is used, the pressure adjustment of the air pressure system has errors, the complete pressure balance cannot be accurately realized during adjustment every time, and meanwhile, the establishment of the air pressure system also needs to invest more cost and occupy more device space, so that the testing difficulty is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to:
in order to solve the problem that the accuracy of a test result is influenced due to the fact that a pressure balance system of a pressure chamber of a triaxial testing machine in the prior art is insufficient in adjustment precision, a confining pressure self-balancing mechanism is provided.
The technical scheme adopted by the utility model is as follows:
the utility model provides an confining pressure self-balancing mechanism, includes the pressure chamber shell, pressure chamber shell upper end is connected with the axial loading piston, inside the lower extreme of axial loading piston stretched into the pressure chamber shell, the axial loading piston bottom was connected with the power transmission post, axial loading piston bottom was connected with the sample cap, installs spacing measurement flange on the axial loading piston, spacing measurement flange joint has the balanced support, the balanced support level sets up, and the end connection of balanced support has balanced piston, is connected with the balanced cylinder liner with balanced piston sliding connection on the inner wall of pressure chamber shell, the inside and outside intercommunication of pressure chamber shell of balanced cylinder liner.
Furthermore, the inner wall of the pressure chamber shell is connected with a guide rod, the guide rod is arranged along the vertical direction, a guide hole matched with the guide rod is formed in the balance support, and a ball joint bearing is connected between the balance piston and the balance support.
Furthermore, an O-shaped sealing ring and a dustproof ring are respectively installed on the inner wall of the balance cylinder sleeve, a balance connecting piece is connected between the bottom of the balance cylinder sleeve and the outer shell of the pressure chamber, a cap-shaped nut is connected onto the balance connecting piece, and a combined sealing ring is connected between the cap-shaped nut and the outer shell of the pressure chamber.
Furthermore, four balance pistons are arranged on a balance support, the four balance pistons are respectively connected with four balance cylinder sleeves, and four guide rods are arranged on the balance support.
Furthermore, a combined sealing gasket is connected between the balance piston and the inner wall of the pressure chamber shell.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
the structure of the utility model is that four balance pistons and corresponding balance cylinder sleeves are added in the pressure chamber, one end of each balance piston is connected with the loading piston through a ball joint bearing, the other end of each balance piston extends into the copper cylinder sleeve, and the inner cavity of the copper cylinder sleeve is connected with the atmosphere through a pipeline. In the test, the loading piston enters the pressure chamber to a certain depth to drive the balance piston to enter the copper cylinder sleeve to the same depth, and as the sum of the sectional areas of the balance piston is equal to the sectional area of the loading piston, the volume of the loading piston extending into the pressure chamber is equal to the volume of the balance piston extending into the copper cylinder sleeve, the cavity volume of the confining pressure medium is kept unchanged, so that the confining pressure is kept stable; compared with the prior art in which the pressure chamber is adjusted by an air pressure system, the mechanism of the utility model has the advantages of lower cost, stronger balance stability, higher pressure adjustment precision and more convenient automatic adjustment.
Drawings
Fig. 1 is a structural view of the mechanism of the present invention.
The labels in the figure are: 1-a pressure chamber shell, 2-a combined sealing ring, 3-a balance connecting piece, 4-a cap nut, 5-a balance cylinder sleeve, 6-an O-shaped ring, 7-a dustproof ring, 8-a balance piston, 9-a guide rod, 10-a combined sealing gasket, 14-a load sensor, 15-an axial loading piston, 16-a limit measuring flange, 17-a balance support, 18-a ball joint bearing, 19-a force transmission column and 20-a sample cap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The confining pressure self-balancing mechanism shown in fig. 1 comprises a pressure chamber shell 1, wherein an axial loading piston 15 is connected to the upper end of the pressure chamber shell 1, the lower end of the axial loading piston 15 extends into the pressure chamber shell 1, a force transmission column 19 is connected to the bottom end of the axial loading piston 15, a sample cap 20 is connected to the bottom of the axial loading piston 15, a limiting measurement flange 16 is mounted on the axial loading piston 15, the limiting measurement flange 16 is connected with a balance support 17, the balance support 17 is horizontally arranged, a balance piston 8 is connected to the end of the balance support 17, a balance cylinder sleeve 5 slidably connected with the balance piston 8 is connected to the inner wall of the pressure chamber shell 1, and the inside of the balance cylinder sleeve 5 is communicated with the outside of the pressure chamber shell 1.
Preferably, the balance cylinder sleeve 5 is made of copper materials, and an inner cavity of the copper cylinder sleeve is connected with the atmosphere through a pipeline. In the test, the balance piston 8 is driven to enter the copper cylinder sleeve at the same depth along with the loading piston entering the pressure chamber at a certain depth. Because the sum of the sectional areas of the balance piston 8 is equal to the sectional area of the loading piston, the volume of the loading piston extending into the pressure chamber is equal to the volume of the balance piston 8 extending into the copper cylinder sleeve, the cavity volume of the confining pressure medium is kept unchanged, and the confining pressure is kept stable.
Preferably, the inner wall of the pressure chamber housing 1 is connected with a guide rod 9, the guide rod 9 is arranged along the vertical direction, the balance bracket 17 is provided with a guide hole matched with the guide rod 9, and a ball joint bearing 18 is connected between the balance piston 8 and the balance bracket 17.
The guide rod 9 can guide the axial loading piston 15 when moving up and down, so that the moving path of the axial loading piston is more accurate, and the balance bracket 17 can be prevented from rotating on the horizontal plane, so that stress and abrasion between the balance piston 8 and the balance cylinder sleeve 5 due to the rotation of the balance bracket 17 are avoided, and the balance piston is prevented from being damaged.
Preferably, four balancing pistons 8 are arranged on the balancing bracket 17, the balancing pistons 8 are respectively connected with the four balancing cylinder sleeves 5, and the balancing bracket 17 is provided with four guide rods 9.
Four sets of piston balance mechanisms are arranged in a matched manner, so that the stability and the pressure balance effect of the balance mechanisms can be improved to the maximum extent on the premise of the simplest structure, and the optimal number of the piston balance mechanisms is set.
Preferably, an O-ring and a dust ring 7 are respectively installed on the inner wall of the balance cylinder sleeve 5, a balance connecting member 3 is connected between the bottom of the balance cylinder sleeve 5 and the pressure chamber housing 1, a cap nut 4 is connected on the balance connecting member 3, and a combined sealing ring 2 is connected between the cap nut 4 and the pressure chamber housing 1.
Preferably, a composite sealing gasket 10 is also connected between the balance piston 8 and the inner wall of the pressure chamber housing 1.
Various sealing rings, sealing gaskets and dustproof rings 7 are combined among the components, so that solid or liquid impurities can be prevented from leaking or entering the moving components, the connection reliability is ensured, and the service life of the mechanism is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A confining pressure self-balancing mechanism is characterized by comprising a pressure chamber shell (1), the upper end of the pressure chamber shell (1) is connected with an axial loading piston (15), the lower end of the axial loading piston (15) extends into the pressure chamber shell (1), the bottom end of the axial loading piston (15) is connected with a force transmission column (19), the bottom of the axial loading piston (15) is connected with a sample cap (20), a limit measuring flange (16) is arranged on the axial loading piston (15), the limiting measurement flange (16) is connected with a balance support (17), the balance support (17) is horizontally arranged, the end part of the balance support (17) is connected with a balance piston (8), the inner wall of the pressure chamber shell (1) is connected with a balance cylinder sleeve (5) which is in sliding connection with the balance piston (8), the balance cylinder sleeve (5) is internally communicated with the outside of the pressure chamber shell (1).
2. Confining pressure self-balancing mechanism according to claim 1, characterized in that the inner wall of the pressure chamber housing (1) is connected with a guide rod (9), the guide rod (9) is arranged along the vertical direction, the balance bracket (17) is provided with a guide hole matching with the guide rod (9), and a ball joint bearing (18) is connected between the balance piston (8) and the balance bracket (17).
3. Confining pressure self-balancing mechanism according to claim 2, characterized in that there are four balancing pistons (8) on the balancing bracket (17), the balancing pistons (8) are connected to four balancing cylinder sleeves (5), respectively, and four guide rods (9) are provided on the balancing bracket (17).
4. The confining pressure self-balancing mechanism according to claim 1, characterized in that the inner wall of the balancing cylinder sleeve (5) is provided with an O-ring and a dust ring (7), a balancing connector (3) is connected between the bottom of the balancing cylinder sleeve (5) and the pressure chamber housing (1), the balancing connector (3) is connected with a cap nut (4), and a combined sealing ring (2) is connected between the cap nut (4) and the pressure chamber housing (1).
5. Confining pressure self-balancing mechanism according to claim 1, characterized in that a combination gasket (10) is further connected between the balancing piston (8) and the inner wall of the pressure chamber housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220063985.2U CN215931553U (en) | 2022-01-12 | 2022-01-12 | Confining pressure self-balancing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220063985.2U CN215931553U (en) | 2022-01-12 | 2022-01-12 | Confining pressure self-balancing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215931553U true CN215931553U (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220063985.2U Active CN215931553U (en) | 2022-01-12 | 2022-01-12 | Confining pressure self-balancing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215931553U (en) |
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2022
- 2022-01-12 CN CN202220063985.2U patent/CN215931553U/en active Active
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