Rock core holder convenient for pasting strain gauges

Abstract

The utility model discloses a core holder convenient for pasting a strain gauge. The core holder consists of a bracket, a communicating rod, a rubber pad, a common screw, a small T-shaped hand screw, a large T-shaped hand screw, a clamping opening and anti-skid rubber. According to the utility model, the clamping opening on the bracket is arc-shaped and is designed to fit a rock core sample; a small T-shaped hand screw and a large T-shaped hand screw on the bracket are respectively used for coarsely adjusting and finely adjusting the distance between the clamping ports to fix the rock core; anti-skid rubber is attached to the inner side of the clamping opening to protect the rock core sample and enhance the fixing effect. The instrument disclosed by the utility model is simple in structure, economical and practical; single-person operation can be realized, so that the independence of experiment operation of students is improved; the core sample is effectively fixed, so that the strain gauge is quickly adhered to the side surface of the core sample, and the early-stage preparation time of an axial tension-compression experiment is saved.

Description

Technical Field

[0001] This utility model relates to the field of rock mechanics teaching demonstration, specifically to a core holder that facilitates the attachment of strain gauges. Background Technology

[0002] Rock mechanics is an important discipline that focuses on exploring the deformation and failure of rocks under the influence of various force fields. Its numerous theories and the results obtained through extensive experiments have been widely applied in many engineering fields such as mining, geology, and civil engineering, playing an indispensable role. In experimental research in rock mechanics, conducting uniaxial and triaxial tensile and compressive tests on rock core samples and then accurately measuring the strain produced by the core samples has become a fundamental and crucial step in the entire research process. Strain gauge measurement, with its high precision, can accurately capture strain conditions, and its relatively flexible operation does not require overly special environmental conditions. Therefore, it has stood out among many measurement methods and has been widely adopted in the industry, becoming one of the commonly used methods in rock mechanics experimental research.

[0003] In the past development of rock mechanics experimental equipment, the focus has often been on obtaining accurate experimental results, while neglecting the preparatory work before conducting uniaxial and triaxial tensile and compressive tests. For example, attaching strain gauges typically requires two people working together. However, the relatively small area of ​​the strain gauge makes it easy for it to break due to insufficient coordination between the two people, or for air bubbles to form at the point where the strain gauge contacts the rock core, thus leading to inaccurate data. Utility Model Content

[0004] The purpose of this invention is to provide a core holder that facilitates the convenient and efficient fixation of core samples and helps students attach strain gauges to the accurate positions of the core samples.

[0005] The technical solution of this utility model is: a core holder for easy bonding of strain gauges, which consists of a bracket, a connecting rod, a rubber pad, ordinary screws, small T-shaped hand screws, large T-shaped hand screws, a clamping port, and anti-slip rubber.

[0006] Preferably, the clamping opening is arc-shaped and has anti-slip rubber attached to the inside.

[0007] As a preferred option, both the large T-shaped hand screw and the small T-shaped hand screw are T-shaped in shape.

[0008] Preferably, the clamping opening is available in various sizes.

[0009] The beneficial effects of this utility model are as follows:

[0010] (1) The experimental device of this utility model has low cost and is easy to promote; it is simple and safe to operate, and can more intuitively observe how the strain gauge is attached to the rock core sample, which is convenient for students to understand.

[0011] (2) The clamping opening of this utility model device is arc-shaped and the inner side is covered with anti-slip rubber, which not only enhances the anti-slip effect but also protects the core sample; the utility model device is equipped with large T-shaped hand-tightening screws and small T-shaped hand-tightening screws on the support, which can avoid the phenomenon of finger slippage caused by fingers being contaminated with oil; the utility model device is equipped with clamping openings of different sizes on the support to adapt to core samples of different shapes.

[0012] (3) When using this utility model device, first pass the large T-shaped hand screw through the screw hole at the top of the bracket and connect it to the clamping port with the screw hole on one side. Then use the small T-shaped hand screw to fix the bracket on either side to the connecting rod. Fix the bracket and the connecting rod with the small T-shaped hand screw. Then use the small T-shaped hand screw on the other bracket to roughly adjust the distance between the two brackets so that it is slightly larger than the core sample to be tested. Then take out the core sample and place it against the clamping port on the fixed side. Then use the large T-shaped hand screw on the other bracket to fine adjust so that the core sample is firmly clamped in the clamping port. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention.

[0014] Figure 2 This is a side view of the present invention.

[0015] Reference numerals: 1-Bracket; 2-Connecting rod; 3-Rubber pad; 4-Ordinary screw; 5-Small T-shaped hand screw; 6-Large T-shaped hand screw; 7-Clamping port; 8-Anti-slip rubber. Detailed Implementation

[0016] The embodiments of the present invention will be further described below with reference to the accompanying drawings, but this is not intended to limit the present invention.

[0017] Before describing the specific implementation of this utility model, in order to make the solution of this utility model clearer and more complete, some of the devices appearing in this utility model will be described first:

[0018] The bracket has a rubber pad at the bottom that is connected by a regular screw; the upper end of the bracket has a large T-shaped hand screw that is screwed in through a screw hole; the connecting rod passes through the hollow part in the middle of the bracket and is fixed to the table with a small T-shaped hand screw.

[0019] Clamping port: The clamping port is arc-shaped and has anti-slip rubber on the inside. There is a screw hole on the other side for connecting a large T-shaped hand screw.

[0020] Small T-shaped hand-tightening screw: The small T-shaped hand-tightening screw is T-shaped and can enhance the stability between the bracket and the connecting rod and coarsely adjust the bracket spacing.

[0021] Large T-shaped hand-tightening screw: The large T-shaped hand-tightening screw is T-shaped and can finely adjust the support spacing to clamp the core sample.

[0022] like Figure 1 As shown in the figure, this utility model patent describes a core holder for easy attachment of strain gauges. The core holder includes: a bracket, a connecting rod, a rubber pad, a common screw, a small T-shaped hand screw, a large T-shaped hand screw, a clamping opening, and anti-slip rubber.

[0023] The rubber pads are fixed to the brackets by ordinary screws; the brackets are all connected by connecting rods and fixed by small T-shaped hand screws; the large T-shaped hand screws are screwed into the brackets through the screw holes at the top of the brackets; the large T-shaped hand screws are connected to the clamping port with screw holes on one side; the clamping port is arc-shaped and has anti-slip rubber on the inside.

[0024] Operating steps:

[0025] (1) Pass the large T-shaped hand screw through the screw hole at the top of the bracket, and then connect it to the clamping port with a screw hole on one side;

[0026] (2) Place two identical brackets on the connecting rod;

[0027] (3) Select one of the brackets and fix it to the left side of the device using a small T-shaped hand screw, and this side will remain fixed thereafter;

[0028] (4) Adjust the small T-shaped hand screw on the other support to make a coarse adjustment so that the distance between the two clamping openings is slightly larger than the core sample to be tested;

[0029] (5) Place the core sample against the inside of the left support clamping opening;

[0030] (6) Using the large T-shaped hand-tightening screw provided on the support, apply appropriate clamping force gradually by turning the screw until the core sample is firmly fixed between the two clamping openings.

[0031] During the use of this invention: the formula for calculating frictional force is f = μF. N (where f represents the frictional force, μ is the coefficient of friction, and F...) N (This is the normal pressure); due to the relatively rough surface of the rubber, its coefficient of friction is relatively large; at the same time, the large T-shaped hand-tightening screws on the support play a key role, applying a set of relative forces to the clamping opening through the large T-shaped hand-tightening screws, causing the clamping opening to tighten the core sample from both sides, thus increasing the normal pressure F between the core sample and the anti-slip rubber. NThis device ensures that the core sample is securely and safely fixed to the device during strain gauge bonding. Therefore, it provides excellent conditions for experimental operations, allowing students to carry out related operations independently. This significantly improves the efficiency of strain gauge bonding and prevents strain gauge breakage and air bubbles at the bonding point with the core sample when students operate independently, thus making the measured data more accurate.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A core holder for easy attachment of strain gauges, characterized in that: It consists of a bracket, connecting rod, rubber pad, ordinary screw, small T-shaped hand screw, large T-shaped hand screw, clamping port, and anti-slip rubber; The rubber pad (3) is fixed to the bracket (1) by ordinary screws (4); the brackets (1) are all connected by connecting rods (2) and fixed by small T-shaped hand screws (5); the large T-shaped hand screws (6) are screwed into the bracket (1) through the screw hole at the upper end of the bracket (1); the large T-shaped hand screws (6) are connected to the clamping port (7) with a screw hole on one side; the clamping port (7) is arc-shaped and has anti-slip rubber (8) attached to the inside.

2. The core holder for easy bonding of strain gauges according to claim 1, characterized in that: The inner side of the clamping opening is arc-shaped and covered with anti-slip rubber (8).

3. A core holder for easy bonding of strain gauges according to claim 1, characterized in that: The large T-shaped hand screw (6) and the small T-shaped hand screw (5) are both T-shaped in shape.

4. A core holder for easy bonding of strain gauges according to claim 1, characterized in that: The clamping port (7) has various sizes.

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