Pressure chamber shell of coarse-grained soil triaxial apparatus experimental device and experimental device

Abstract

The utility model discloses a coarse-grained soil triaxial apparatus experimental device pressure chamber housing and experimental device, the pressure chamber housing comprises a housing and a top cover, the bottom of the top cover is provided with a cavity for accommodating a load measuring device, and the outer side of the cavity is provided with a cover plate connected with the top cover. According to the utility model, the load measuring device is integrated in the top cover of the pressure chamber, so that loading data can be accurately obtained in real time, the accuracy and the stability of load measurement in a test process are ensured, and the reliability of a test result is improved. The sealing ring is arranged between the cover body and the cover plate of the top cover of the pressure chamber, the sealing performance of the pressure chamber is ensured, the drainage flow channel is designed at the installation position of the sensor, when water enters the sealing cover plate due to sealing failure caused by aging of the sealing ring, leaked water leaks out through the flow channel and does not flood the sensor, the damage risk of the sensor is reduced, and the service life of the sensor is prolonged. The durability and the service life of the equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of triaxial test equipment, in particular to a pressure chamber shell of a coarse-grained soil triaxial instrument experimental device and an experimental device. Background Art

[0002] Triaxial testing of coarse-grained soils is an important method for studying their mechanical properties. The pressure chamber housing is a crucial component of triaxial testing equipment. In existing technologies, the pressure chamber housing serves only as a conventional container, essentially a simple inverted beaker-shaped shell.

[0003] There are two ways to set up the load measuring device in this field: one is to set the sensor outside the pressure chamber. At this time, the load detected by the sensor will inevitably be interfered by the friction between the sensor or the force transmission part and other parts, resulting in errors in the acquired data. The second is to improve this situation and set the sensor at the bottom and directly connect it to the load-adding part. The problem with this setting is that if the sealing effect is not good or fails, the confining pressure medium will directly invade the sensor and cause damage. Since the pressure chamber is a high-pressure environment when working, the possibility of confining pressure medium intrusion is aggravated, resulting in frequent damage to the sensor and increased test costs. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model aims to provide a new coarse-grained soil triaxial test device pressure chamber housing that combines a load measurement device with the pressure chamber housing. The specific technical solution includes:

[0005] The pressure chamber shell of the coarse-grained soil triaxial instrument experimental device comprises a shell and a top cover. The bottom of the top cover is provided with a cavity for accommodating a load measuring device, and the outer side of the cavity is provided with a cover plate connected to the top cover.

[0006] In some preferred embodiments, the present invention further comprises: a force transmission member which passes through the cover plate and has one end for abutting against the load measuring device and the other end for abutting against the sample cap.

[0007] In some preferred embodiments, the top cover is provided with a drainage channel on a side wall close to the cover plate for connecting the cavity with the external space.

[0008] In some preferred embodiments, at least one sealing ring is provided between the cover plate and the housing.

[0009] In some preferred embodiments, a first connecting flange is provided at one end of the shell close to the top cover, and the cover plate is provided between the top cover and the first connecting flange.

[0010] In some preferred embodiments, a second connecting flange is provided at one end of the shell away from the top cover.

[0011] The utility model also provides a coarse-grained soil triaxial test apparatus, comprising a bracket, a pressure chamber body arranged on the bracket and composed of a pressure chamber shell and a pressure chamber base as described above for the coarse-grained soil triaxial test apparatus;

[0012] The pressure chamber base is fixedly connected to the bracket; an axial loading device for applying axial stress to the sample is provided at the lower end of the pressure chamber base; a locking device for connecting the pressure chamber base and the pressure chamber shell of the coarse-grained soil triaxial apparatus experimental device is also provided on the outside of the pressure chamber base.

[0013] Beneficial effects

[0014] 1. Improve data accuracy: The load measurement device is integrated into the top cover of the pressure chamber, which can obtain loading data in real time and accurately, ensuring the accuracy and stability of load measurement during the test, thereby improving the reliability of the test results.

[0015] 2. Enhance equipment durability: A sealing ring is set between the cover body and the cover plate of the pressure chamber top cover to ensure the sealing performance of the pressure chamber. A water leakage channel is designed at the sensor installation position. When the sealing cover fails to seal due to aging of the sealing ring and water enters, the leaked water leaks out through the channel and will not flood the sensor, reducing the risk of sensor damage and improving the durability and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front view of the pressure chamber shell of the coarse-grained soil triaxial test device in a preferred embodiment of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the pressure chamber housing at position AA of a coarse-grained soil triaxial apparatus experimental device in a preferred embodiment of the present invention;

[0018] Figure 3 This is an enlarged structural diagram of the pressure chamber housing A of the coarse-grained soil triaxial test apparatus in a preferred embodiment of the present invention;

[0019] Figure 4 This is a front view structural diagram of a coarse-grained soil triaxial apparatus experimental device in another preferred embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the top view of the coarse-grained soil triaxial apparatus experimental device in another preferred embodiment of the present invention;

[0021] Figure 6 This is a schematic cross-sectional view of the coarse-grained soil triaxial test apparatus at position BB in another preferred embodiment of the present invention;

[0022] Figure 7 This is a structural diagram of a coarse-grained soil triaxial test apparatus in another preferred embodiment of the present invention after the pressure chamber housing is hoisted and displaced;

[0023] In the figure: 1. Housing; 2. Top cover; 3. Cavity; 4. Cover plate; 5. Force transmission member; 6. Drain channel; 7. First connecting flange; 8. Second connecting flange; 9. Bracket; 10. Axial loading device; 11. Locking device; 12. Pressure chamber base. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a pressure chamber housing of a coarse-grained soil triaxial test apparatus, comprising a shell 1 and a top cover 2. A cavity 3 for accommodating a load measuring device is provided at the bottom of the top cover 2, and a cover plate 4 connected to the top cover 2 is provided on the outside of the cavity 3. It should be understood that the size of the cavity 3 should be determined according to the external dimensions of the load measuring device it needs to accommodate. Preferably, the load measuring device is a spoke-type load measuring device. The cover plate 4 is provided between the shell 1 and the top cover 2, and has a good sealing effect with both. Obviously, the sealing of the cover plate 4 can be achieved by adding a sealing ring at the contact point. Preferably, at least one sealing ring is provided between the cover plate 4 and the shell 1.

[0027] There are two ways to set up the load measuring device in this field: one is to set the load measuring device outside the pressure chamber, and the sensor is connected to the specimen through a force transmission member. This setting method will cause the load data detected by the sensor to be interfered with by the friction between the force transmission member and other parts, resulting in errors in the data. This error reduces the accuracy of the test results and affects the accurate evaluation of the mechanical properties of the specimen; the second is to improve this situation. In order to reduce the interference of friction, the sensor is set at the bottom of the pressure chamber so that it is directly connected to the load-adding member. Although this setting reduces friction interference and improves data accuracy, it also brings new problems. If the sealing effect is not good or fails, the confining pressure medium will directly invade the sensor, causing damage to the sensor. Since the pressure chamber is in a high-pressure environment when working, the risk of confining pressure medium intrusion is greater, and the sensor is therefore frequently damaged, increasing the maintenance cost of the test and the cost of equipment replacement.

[0028] The load measuring device provided in the top cover 2 has a lower risk of intrusion of the confining pressure medium than the traditional method. At this time, the load measuring device is effectively separated from the confining pressure medium. Since the load measuring device of the utility model is provided inside the pressure chamber top cover 2, it is not convenient for it to directly contact the sample cap. Therefore, in some preferred embodiments, it is considered to provide a force transmission member 5 that passes through the cover plate 4 and is used to abut against the load measuring device at one end and the sample cap at the other end. At this time, on the one hand, the sensor is directly placed in the pressure chamber top cover, avoiding friction interference between the force transmission member and other parts, ensuring the accuracy and reliability of the load data. On the other hand, the pressure chamber top cover is designed with a special sealing device to ensure that the confining pressure medium does not invade the interior of the sensor, protecting the sensor from the influence of the high-pressure confining pressure medium. The integrated design of the sensor and the pressure chamber top cover enables it to better adapt to high-pressure environments, reduces the risk of sensor damage, extends the service life of the sensor, and reduces the maintenance cost of the test.

[0029] The housing 1 and top cover 2 can be integrally formed or formed from two connected parts. Considering the manufacturing cost and difficulty of the pressure chamber housing, the housing 1 and top cover 2 are preferably connected in two parts to form the pressure chamber housing. In this case, to facilitate the connection between the two, a first connecting flange 7 is provided at one end of the housing 1 near the top cover 2, and the cover plate 4 is disposed between the top cover 2 and the first connecting flange 7. The connection between the two is achieved by screwing bolts that penetrate the top cover 2 into the reserved screw holes in the first connecting flange 7.

[0030] Example 2

[0031] like Figure 3As shown, considering that the sealing fails due to aging of the sealing component (such as aging of the sealing ring), the confining pressure medium invades the cavity 3 during the test and floods the load measuring device, causing damage. Therefore, a drainage channel 6 for connecting the cavity 3 with the external space is provided on the side wall of the top cover 2 close to the cover plate 4. At this time, even if the confining pressure medium invades the cavity 3 during the test, it can leak out through the drainage channel 6, thereby avoiding the risk of damage to the load measuring device.

[0032] Example 3

[0033] The connection method between the pressure chamber shell and the pressure chamber base in this field can adopt a commonly used screw locking structure, or it can be a clamp locking structure disclosed by the Chinese invention patent with publication number CN117740554A. This embodiment provides a universal connection structure that can adapt to the above two connection methods, that is, a second connecting flange 8 is provided at the end of the shell 1 away from the top cover 2. At this time, if the screw locking structure is adopted, the screw passes through the screw hole reserved in the second connecting flange 8 and is connected to the pressure chamber base; if the clamp locking structure is adopted, the second connecting flange 8 and the connecting flange on the pressure chamber base are clamped together with a clamp.

[0034] Example 4

[0035] like Figure 4-Figure 6 As shown, this embodiment provides a coarse-grained soil triaxial test apparatus based on the above embodiment, including a bracket 9, a pressure chamber body arranged on the bracket 9, and composed of a pressure chamber shell and a pressure chamber base 12 of the coarse-grained soil triaxial test apparatus described in the above embodiment;

[0036] The pressure chamber base 12 is fixedly connected to the bracket 9; an axial loading device 10 for applying axial stress to the sample is provided at the lower end of the pressure chamber base 12; a locking device 11 for connecting the pressure chamber base 12 and the pressure chamber shell of the coarse-grained soil triaxial apparatus experimental device is also provided on the outside of the pressure chamber base 12.

[0037] The axial reaction force structure adopts a self-reaction force method to strengthen the pressure chamber shell 3, the axial loading device 104, and the locking device 115 to form a self-reaction force structure, abandoning the large reaction force frame of the traditional coarse-grained soil triaxial testing machine. While ensuring the rigidity, it reduces the equipment height, reduces the equipment weight, and reduces the equipment installation site restrictions.

[0038] The coarse-grained soil triaxial test apparatus provided in this embodiment has the advantage that the pressure chamber housing and the entire apparatus are detachable and can be moved to another location by lifting or hoisting. Figure 7As shown, the entire sample area is fully exposed, providing ample operating space. This not only makes sample preparation and installation easier and more efficient, but also effectively avoids the operational difficulties and unevenness caused by the narrow space in traditional equipment.

[0039] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A pressure chamber housing of a coarse-grained soil triaxial apparatus experimental device, comprising a housing (1) and a top cover (2), characterized in that: The bottom of the top cover (2) is provided with a cavity (3) for accommodating a load measuring device, and the outside of the cavity (3) is provided with a cover plate (4) connected to the top cover (2); a force transmission member (5) passes through the cover plate (4) and is used to abut against the load measuring device at one end and abut against the sample cap at the other end; at least one sealing ring is provided between the cover plate (4) and the housing (1).

2. The pressure chamber housing of the coarse-grained soil triaxial apparatus test device according to claim 1, characterized in that: The top cover (2) is provided with a drainage channel (6) on a side wall close to the cover plate (4) for connecting the cavity (3) with the external space.

3. The pressure chamber housing of the coarse-grained soil triaxial apparatus test device according to claim 1, characterized in that: A first connecting flange (7) is provided at one end of the shell (1) close to the top cover (2), and the cover plate (4) is provided between the top cover (2) and the first connecting flange (7).

4. The pressure chamber housing of the coarse-grained soil triaxial apparatus test device according to claim 1 or 3, characterized in that: A second connecting flange (8) is provided at one end of the shell (1) away from the top cover (2).

5. Coarse-grained soil triaxial test apparatus, characterized in that: It comprises a bracket (9), a pressure chamber body arranged on the bracket (9) and composed of a pressure chamber shell of the coarse-grained soil triaxial apparatus experimental device and a pressure chamber base (12) as described in any one of claims 1 to 4; The pressure chamber base (12) is fixedly connected to the bracket (9); an axial loading device (10) for applying axial stress to a sample is provided at the lower end of the pressure chamber base (12); and a locking device (11) for connecting the pressure chamber base (12) and a pressure chamber housing of a coarse-grained soil triaxial apparatus experimental device is also provided on the outside of the pressure chamber base (12).

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