Experimental device for rock point load and tensile strength

Abstract

The utility model belongs to the technical field of experimental equipment, and particularly relates to an experimental device for rock point load and tensile strength, which comprises an upper universal base, a lower universal base, a test piece template, a bracket connecting rod and a universal locking block, the circumference of the upper universal base and the circumference of the lower universal base are connected together through a support connecting rod and a universal locking block, and a test piece template is installed on the upper universal base and the lower universal base in a replaceable mode. The device reduces the test cost, improves the corresponding test efficiency, and can complete the work of tensile strength test and point load strength test by cooperating with a universal testing machine.

Description

Technical Field

[0001] This utility model belongs to the field of experimental equipment technology, specifically relating to an experimental device for testing rock point load and tensile strength. Background Technology

[0002] Rock tensile strength tests and point load strength tests are important indicators reflecting the mechanical properties of rocks and are also necessary parameters for evaluating surrounding rock stability and design calculations. Currently, in indoor rock testing, tensile strength and point load strength tests require specialized tensile strength and point load strength testing equipment, respectively. However, the quality of these equipment on the market varies greatly, with some machines failing to meet specifications. Using proper testing equipment significantly increases testing costs, and different tests require different machines, reducing testing efficiency. Furthermore, during the installation of specimens for point load strength and tensile strength tests, the upper and lower contact points are easily misaligned, causing the specimen to slip, fall, or become unstable, making it impossible to pre-fix it in the middle of the upper and lower loading points, thus affecting testing efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an experimental device for testing rock point loads and tensile strength, in order to solve the problems existing in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an experimental device for rock point load and tensile strength testing, comprising an upper universal base, a lower universal base, a test specimen template, a support connecting rod, and a universal locking block. The upper universal base and the lower universal base are connected together around their circumferences by the support connecting rod and the universal locking block. The test specimen template can be replaced and installed on the upper universal base and the lower universal base.

[0005] Preferably, the upper universal base and the lower universal base are respectively provided with spherical grooves around their circumferences, and a magnetic ball head is provided in each spherical groove. The magnetic ball head is attracted and engaged with the spherical groove. One end of the bracket connecting rod is threadedly connected to the magnetic ball head, and the other end of the bracket connecting rod is connected to a universal ball head. The universal ball head is placed inside the universal locking block. The universal locking block is threadedly connected to a wrench. The wrench is inserted into the universal locking block and contacts the upper and lower universal ball heads. Tightening the wrench clockwise presses the two universal ball heads together. Loosening the wrench counterclockwise releases the two universal ball heads.

[0006] Preferably, the lower middle part of the upper universal base and the upper middle part of the lower universal base are respectively provided with square grooves, and the corresponding test piece template is provided with square protrusions, and the square protrusions and square grooves are interlocked.

[0007] Preferably, the test specimen template includes an upper point load cone and a lower point load cone, the upper point load cone being installed on the lower part of the upper universal base, and the lower point load cone being installed on the upper part of the lower universal base.

[0008] Preferably, the test specimen template includes an upper base for hard rock tensile strength, steel wire pads, and a lower base for hard rock tensile strength. The upper base for hard rock tensile strength is installed on the lower part of the upper universal base, and the lower base for hard rock tensile strength is installed on the upper part of the lower universal base. There are two steel wire pads, which are respectively installed on the upper base for hard rock tensile strength and the lower base for hard rock tensile strength.

[0009] Preferably, the test specimen template includes an upper base for soft rock tensile strength, a plywood pad, and a lower base for soft rock tensile strength. The upper base for soft rock tensile strength is installed on the lower part of the upper universal base, and the lower base for soft rock tensile strength is installed on the upper part of the lower universal base. There are two plywood pads, which are respectively installed on the upper base for soft rock tensile strength and the lower base for soft rock tensile strength.

[0010] The beneficial effects of this invention are: this device reduces testing costs and improves the efficiency of corresponding tests. When used in conjunction with a universal testing machine, it can complete tensile strength tests and point load strength tests. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the point load test in this embodiment;

[0012] Figure 2 This is a structural diagram of the tensile strength test of hard rock (harder rock) in this embodiment;

[0013] Figure 3 This is a structural diagram of the tensile strength test of soft rock (relatively soft rock) in this embodiment;

[0014] Figure 4 This is a structural diagram of the upper universal base and the lower universal base in this embodiment;

[0015] Figure 5 This is a schematic diagram of the upper cone and lower cone under point load in this embodiment;

[0016] Figure 6 This is a schematic diagram of the upper and lower bases for hard rock tensile strength in this embodiment;

[0017] Figure 7 This is a schematic diagram of the upper and lower bases for the tensile strength of soft rock in this embodiment. Detailed Implementation

[0018] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0022] like Figure 1As shown, an experimental apparatus for testing rock point load and tensile strength includes an upper universal base 1, a lower universal base 5, a test specimen template, a support connecting rod 6, and a universal locking block 7. The upper and lower universal bases are connected circumferentially by the support connecting rod and the universal locking block. The test specimen template can be interchangeably installed on the upper and lower universal bases. The upper and lower universal bases are respectively provided with spherical grooves on their circumferences, and each spherical groove contains a corresponding magnetic ball head 8. The universal base is made of stainless steel, and the magnetic ball heads can be adsorbed onto the spherical grooves of the universal base. The magnetic ball head is attracted to the spherical groove. One end of the bracket connecting rod is threaded to the magnetic ball head, and the other end of the bracket connecting rod is connected to a universal ball head. The universal ball head is placed inside the universal locking block. The universal locking block is threaded to a wrench. The wrench is inserted into the universal locking block and contacts the upper and lower universal ball heads. Tightening the wrench clockwise presses the two universal ball heads together. Loosening the wrench counterclockwise releases the two universal ball heads.

[0023] like Figure 4 As shown, the test specimen template in this device has three structures, which can be used for point load tests, tensile strength tests of hard rock (harder rock), and tensile strength tests of soft rock (softer rock). To facilitate the installation of the test specimen template, the lower middle part of the upper universal base and the upper middle part of the lower universal base are respectively provided with square grooves 17, and the corresponding test specimen template is provided with square protrusions 18. The square protrusions and square grooves are interlocked.

[0024] Specifically: such as Figure 1 and Figure 5 As shown, the test specimen template includes an upper point-load cone 2 and a lower point-load cone 4. The apex angles of the upper point-load cone 2 and the lower point-load cone 4 are 60°, and the radius of curvature of their ends is 5mm. The upper point-load cone is installed on the lower part of the upper universal base, and the lower point-load cone is installed on the upper part of the lower universal base. When conducting point load tests, install the upper point load cone 2 and the lower point load cone 4 on the upper universal base 1 and the lower universal base 5. Place the point load specimen 3 between the upper point load cone 2 and the lower point load cone 4. Then, connect the specimen with four universal locking blocks 7, the bracket connecting rod 6, and the magnetic ball head 8 using threads. Next, use the magnetic ball head 8 to be attracted to the spherical grooves of the upper universal base 1 and the lower universal base 5 by the magnetic attraction. Adjust the universal locking blocks 7 to fix the point load specimen 3 in the middle of the equipment. Then, place it on the test table of the universal testing machine. After fixing the system by preloading, open the universal locking blocks 7 to start the point load strength test.

[0025] like Figure 2 and Figure 6As shown, the test specimen template includes an upper base 9 for hard rock tensile strength testing, a steel wire pad 10, and a lower base 11 for hard rock tensile strength testing. The upper base is installed on the lower part of the upper universal base, and the lower base is installed on the upper part of the lower universal base. Two steel wire pads are installed on the upper and lower bases respectively. The upper base 9 and the steel wire pad 10 have corresponding grooves for installing the steel wire pad 10; these grooves are arc-shaped grooves with a radius of curvature of 0.5 mm. The installation method for the hard rock tensile strength test is similar to that for the point load strength test. When performing the hard rock-to-hard rock tensile strength test, the upper and lower hard rock tensile strength bases are installed on the upper universal base 1 and the lower universal base 5. At the same time, the steel wire pads 10 are placed on the spherical grooves of the upper hard rock tensile strength base 9 and the lower hard rock tensile strength base 12. The hard rock tensile specimen 11 is then placed between the steel wire pads 10. Four universal locking blocks 7, the bracket connecting rod 6, and the magnetic ball head 8 are then connected by threads. The magnetic ball head 8 is then attracted to the spherical grooves of the upper universal base 1 and the lower universal base 5 by the magnetic attraction. The universal locking blocks 7 are adjusted to fix the hard rock tensile specimen 11 in the middle of the equipment. Then, it is placed on the test table of the universal testing machine. After the system is fixed by preloading, the universal locking blocks 7 are opened, and the hard rock-to-hard rock tensile strength test can be started.

[0026] like Figure 3 and Figure 7 As shown, the test specimen template includes an upper base 13 for soft rock tensile strength testing, a plywood pad 14, and a lower base 16. The upper base is installed on the lower part of the upper universal base, and the lower base is installed on the upper part of the lower universal base. Two plywood pads are installed on the upper and lower bases, respectively. The upper base 13 and the plywood pad 14 have a U-shaped groove for mounting the plywood pad 14. When conducting a soft rock tensile strength test, the upper base 13 and lower base 16 of the soft rock tensile strength test are installed on the upper universal base 1 and lower universal base 5, respectively. Simultaneously, bakelite board pads 14 are placed in the grooves of the upper base 13 and lower base 16. The soft rock tensile specimen 15 is then placed between the bakelite board pads 14. Four universal locking blocks 7, a bracket connecting rod 6, and a magnetic ball head 8 are then connected via threads. The magnetic ball head 8 is then attracted to the spherical grooves of the upper and lower universal bases 1 and 5 by magnetic attraction. The universal locking blocks 7 are adjusted to fix the soft rock tensile specimen 15 in the middle of the equipment. The specimen is then placed on the test bench of the universal testing machine. After the system is fixed by pre-loading, the universal locking blocks 7 are opened, and the soft rock tensile strength test can begin.

[0027] This apparatus, in accordance with the "Code for Rock Testing in Water Conservancy and Hydropower Engineering" (SL / T 264-2020), integrates the loading point cone for point load strength testing and the steel wire pads and bakelite pads for tensile strength testing onto a single base. For tensile rock testing, a steel wire pad base is used for hard rock, while a bakelite pad base is used for soft rock. For point load strength testing, the point load cone is installed on the base, and the upper and lower plates are connected by four universal locking devices. Pre-tightening is performed before opening the locking devices, facilitating specimen and equipment installation and avoiding any interference with the test results. By using a universal testing machine and different loading devices, various related tests can be completed, saving the cost of repeatedly purchasing related equipment and avoiding redundant testing equipment.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An experimental apparatus for testing point loads and tensile strength in rocks, characterized in that, It includes an upper universal base, a lower universal base, a test specimen template, a bracket connecting rod, and a universal locking block. The upper universal base and the lower universal base are connected together around their circumference by the bracket connecting rod and the universal locking block. The test specimen template can be replaced and installed on the upper universal base and the lower universal base.

2. The experimental apparatus for testing rock point load and tensile strength according to claim 1, characterized in that, The upper and lower universal bases are respectively provided with spherical grooves around their circumferences. Each spherical groove contains a corresponding magnetic ball head, which is attracted to and engaged with the spherical groove. One end of the bracket connecting rod is threadedly connected to the magnetic ball head, and the other end of the bracket connecting rod is connected to a universal ball head. The universal ball head is placed inside the universal locking block, which is threadedly connected to a wrench. The wrench is inserted into the universal locking block and contacts the upper and lower universal ball heads. Tightening the wrench clockwise presses the two universal ball heads together, and loosening the wrench counterclockwise releases the two universal ball heads.

3. The experimental apparatus for testing rock point loads and tensile strength according to claim 1 or 2, characterized in that, The lower middle part of the upper universal base and the upper middle part of the lower universal base are respectively provided with square grooves, and the corresponding test piece template is provided with square protrusions. The square protrusions and square grooves are interlocked.

4. The experimental apparatus for testing rock point load and tensile strength according to claim 3, characterized in that, The test specimen template includes an upper point load cone and a lower point load cone. The upper point load cone is installed on the lower part of the upper universal base, and the lower point load cone is installed on the upper part of the lower universal base.

5. The experimental apparatus for testing rock point load and tensile strength according to claim 3, characterized in that, The test specimen template includes an upper base for hard rock tensile strength, steel wire pads, and a lower base for hard rock tensile strength. The upper base for hard rock tensile strength is installed on the lower part of the upper universal base, and the lower base for hard rock tensile strength is installed on the upper part of the lower universal base. There are two steel wire pads, which are respectively installed on the upper base for hard rock tensile strength and the lower base for hard rock tensile strength.

6. The experimental apparatus for testing rock point load and tensile strength according to claim 3, characterized in that, The test specimen template includes an upper base for soft rock tensile strength, a plywood pad, and a lower base for soft rock tensile strength. The upper base for soft rock tensile strength is installed on the lower part of the upper universal base, and the lower base for soft rock tensile strength is installed on the upper part of the lower universal base. There are two plywood pads, which are respectively installed on the upper base for soft rock tensile strength and the lower base for soft rock tensile strength.

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