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CN-121977895-A - Sample pressing and preparing instrument and sample pressing and preparing method for triaxial experiment

CN121977895ACN 121977895 ACN121977895 ACN 121977895ACN-121977895-A

Abstract

The invention discloses a sample pressing and preparing instrument and a sample pressing and preparing method for triaxial experiments, which are characterized in that lateral friction and unbalanced load are reduced through the coaxial arrangement of a positioning boss, an operation hole, a jack and a sample sleeve, centering difficulty is avoided, the jack is used as a power source, controllability of forming force can be realized through pressure control, when a sample is ejected, the sample is ejected out of the sample along an axis through the cooperation of the operation hole and the jack on the premise of coaxiality, low disturbance demolding is realized, secondary damage of a traditional demolding mode to the sample is avoided, the sample pressing unit or the sample preparing unit is replaced by a support piece based on a base and a slide bar only according to different requirements of sample pressing or sample preparation, the repeatability of repeated operation is ensured, and geometric deviation is avoided.

Inventors

  • DENG JIE
  • WANG HAIRONG
  • DUAN SHILIN
  • WANG LIHANG
  • WANG JIBO
  • ZHAO SHUTANG
  • LI ZELUN
  • DENG YANG
  • QIAO SHAONAN

Assignees

  • 河南省第五地质勘查院有限公司
  • 河南省第二地质大队有限公司
  • 河南省地质环境规划设计院有限公司

Dates

Publication Date
20260505
Application Date
20251212

Claims (10)

  1. 1. The sample pressing and preparing instrument for the triaxial experiment is characterized by comprising a base (8), wherein a sliding rod is arranged on the base (8), a sample pressing unit (1) or a sample preparing unit (2) is arranged on the sliding rod, and a jack (3) is arranged on the base (8); The sample pressing unit (1) comprises a middle workbench (7) and a sample pressing bearing plate (10) which are sequentially arranged from bottom to top, the middle workbench (7) can move up and down along a sliding rod, a positioning boss (9) coaxial with the jack (3) is arranged on the upper bearing plate (10), during sample pressing, a sample sleeve (4) for auxiliary sample pressing is placed on the workbench (7), the jack (3) drives the workbench (7) to move up along the sliding rod, and a sample in the sample sleeve (4) is pressed by matching with the positioning boss (9); The sample preparation unit (2) comprises a positioning seat (11) and a sample preparation bearing plate (12) which are sequentially arranged from bottom to top, operation holes axially corresponding to the jack (3) are formed in the positioning seat (11) and the sample preparation bearing plate (12), during sample preparation, the sample sleeve (4) is placed at the operation holes of the positioning seat (11), and the driving end of the jack (3) ejects samples in the sample sleeve (4) along the operation holes.
  2. 2. The sample pressing and preparing instrument for triaxial experiments according to claim 1, characterized in that a limiter (6) is arranged on the base (8), and the limiter (6) is used for limiting the vertical height of the middle workbench (7) or the positioning seat (11).
  3. 3. A sample preparation device for triaxial experiments according to claim 1, characterized in that the upper bearing plate (10) or sample preparation bearing plate (12) is located at the upper end of the slide bar.
  4. 4. A sample preparation device for triaxial experiments according to claim 1, characterized in that the positioning boss (9) is arranged at the lower end face of the upper bearing plate (10).
  5. 5. The sample preparation device for triaxial experiments according to claim 1, characterized in that the working hole on the positioning seat (11) is a U-shaped groove, and the opening of the U-shaped groove is located on the side wall of the positioning seat (11).
  6. 6. A sample preparation device for triaxial experiments according to claim 5, characterized in that the working holes in the sample preparation bearing plate (12) are circular through holes (13).
  7. 7. The sample pressing and preparing instrument for triaxial experiments according to claim 6, characterized in that the driving end of the jack (3) is provided with a screw rod (16), the inside of the sample sleeve (4) is provided with a push block, the push block is positioned at the lower end of the pressed sample, the jack (3) drives the screw rod (16) upwards, and the screw rod (16) pushes the push block, so that the pressed sample is ejected.
  8. 8. A sample preparation device for triaxial experiments according to claim 1, characterized in that the slide bar is located at the upper end of the base (8).
  9. 9. The sample pressing and preparing instrument for triaxial experiments according to claim 6, characterized in that the materials of the seat (8), the sliding rod, the middle working table (7), the sample pressing and supporting plate (10), the positioning seat (11) and the sample preparing and supporting plate (12) are all made of steel materials.
  10. 10. A method of preparing a sample by pressing based on the apparatus of claim 1, comprising the steps of: The sample pressing unit (1) is arranged on the sliding rod, a product to be pressed is placed in the sample sleeve (4), and the sample sleeve (4), the positioning boss (9) and the jack (3) are coaxially arranged; The jack (3) drives the workbench (7) to move upwards along the sliding rod, the sample sleeve (4) is gradually close to the positioning boss (9) until the lower end of the positioning boss (9) is embedded into the sample sleeve (4), and the positioning boss (9) is matched with the jack (3) to press a sample in the sample sleeve (4); The sample pressing unit (1) is detached from the slide bar, the sample preparation unit (2) is arranged on the slide bar, the sample sleeve (4) is placed at the working hole of the positioning seat (11), and the jack (3), the sample sleeve (4) and the working hole are coaxially arranged; Starting the jack (3), and enabling the driving end of the jack (3) to sequentially penetrate through the operation hole on the positioning seat (11), the sample sleeve (4) and the operation hole on the sample preparation bearing plate (12), so that the sample in the sample sleeve (4) is ejected out to the upper end of the sample preparation bearing plate (12).

Description

Sample pressing and preparing instrument and sample pressing and preparing method for triaxial experiment Technical Field The invention belongs to the technical field of geotechnical engineering tests, and relates to a sample pressing and preparing instrument and method for triaxial experiments. Background The triaxial compression test is a basic method for evaluating the strength and deformation properties of rock and soil, but the result is highly sensitive to the quality of a sample, and the accuracy of cylindricity, end surface parallelism and coaxiality, the stability of height-diameter ratio and the uniformity of density and water content along the height are required. The existing sample preparation modes such as layered tamping, static pressure or simple jack pressing and the like generally have the defects that the end friction density gradient and structural disturbance are difficult to ensure, the geometric precision and the centering are difficult to ensure, the forming pressure and the forming speed are uncontrollable, the repeatability is poor, the secondary disturbance is caused by difficult demolding and ejection, the specification replacement operation efficiency is low, and the frame rigidity is insufficient and the limit protection is lacked to cause eccentricity and potential safety hazard. Disclosure of Invention The invention aims to solve the problems that in the triaxial compression test in the prior art, geometric precision and centering are difficult to ensure, molding pressure and rate are uncontrollable, repeatability is poor, demolding and ejection are difficult, and secondary disturbance is easy to cause, and provides a sample pressing and preparing instrument for triaxial experiments, in particular to a triaxial sample pressing and molding device which can realize high-rigidity guiding, precise and controllable molding load and stroke and low-disturbance ejection in a limited space so as to ensure the consistency of the geometry and density of a sample and remarkably improve sample preparing efficiency and repeatability. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: A sample pressing and preparing instrument for triaxial experiments comprises a base, wherein a sliding rod is arranged on the base, a sample pressing unit or a sample preparing unit is arranged on the sliding rod, and a jack is arranged on the base; The sample pressing unit comprises a middle workbench and a sample pressing bearing plate which are sequentially arranged from bottom to top, the middle workbench can move up and down along the sliding rod, a positioning boss coaxial with a jack is arranged on the upper bearing plate, a sample sleeve for assisting in sample pressing is placed on the workbench when sample pressing is carried out, the jack drives the workbench to move upwards along the sliding rod, and the jack cooperates with the positioning boss to press a sample in the sample sleeve; the sample preparation unit comprises a positioning seat and a sample preparation bearing plate which are sequentially arranged from bottom to top, wherein operation holes axially corresponding to the jack are formed in the positioning seat and the sample preparation bearing plate, during sample preparation, a sample sleeve is placed at the operation holes of the positioning seat, and a sample in the sample sleeve is ejected out by the driving end of the jack along the operation holes. The invention further improves that: the base is provided with a limiter, and the limiter is used for limiting the vertical height of the middle workbench or the positioning seat. The upper bearing plate or the sample preparation bearing plate is positioned at the upper end of the slide bar. The positioning boss is arranged on the lower end face of the upper bearing plate. The operation hole on the positioning seat is a U-shaped groove, and an opening of the U-shaped groove is positioned on the side wall of the positioning seat. The operation hole on the sample preparation bearing plate is a circular through hole. The driving end of the jack is provided with a screw rod, the inside of the sample sleeve is provided with a pushing block, the pushing block is positioned at the lower end of the pressed sample, the jack drives the screw rod upwards, and the screw rod pushes the pushing block to push out the pressed sample. The slide bar is located at the upper end of the base. The base, the slide bar, the middle workbench, the sample pressing bearing plate, the positioning base and the sample preparation bearing plate are all made of steel materials. A method of preparing a sample by pressing based on the apparatus of claim 1, comprising the steps of: The sample pressing unit is arranged on the sliding rod, a product to be pressed is placed in the sample sleeve, and the sample sleeve, the positioning boss and the jack are coaxially arranged; The jack drives the workbench to move upwards al