Rock Brazilian disk splitting strength testing device

Abstract

According to the rock Brazilian disc splitting strength testing device, two opposite supports are arranged, mounting rods are arranged on the two supports, cross beams are arranged at the ends, away from the supports, of the mounting rods, internal thread sleeves are arranged on the cross beams, and the two internal thread sleeves are connected through positive and negative screw threads, so that the distance between the two supports can be adjusted; the test device can adapt to test rocks with different sizes, and test devices with different models do not need to be replaced, so that the experiment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of material mechanical performance testing, in particular to a rock Brazilian disc splitting strength testing device. Background Art

[0002] Rock is an important material for underground engineering. The failure strength of rock under complex stress determines the stability of the surrounding rock of underground engineering. Rock strength includes compressive strength, tensile strength and shear strength, among which tensile strength has a very important influence on the stability of underground engineering. In fact, the tensile strength of rock is much smaller than the compressive strength. In the drilling and blasting of underground engineering rock mass, tensile failure becomes an important failure mode. Therefore, the test of rock tensile strength is an important content in the field of rock mechanics.

[0003] Rock tensile strength test methods can be divided into two categories: direct method and indirect method. The direct method is to use a method similar to the metal material test, in which the rock is made into a cylindrical rod and clamped at both ends with metal components. This test can easily cause the clamp to damage the surface of the specimen, causing stress concentration and damage at the clamping site. There are many types of indirect methods, and the commonly used ones are disc and cylinder radial fracturing methods. Among them, the disc radial fracturing method is also the "Brazilian test". It uses a solid disc and makes it break under radial compression to obtain the tensile strength. However, due to the non-uniform size of the discs in the "Brazilian test", multiple types of load-bearing devices need to be equipped when conducting the experiment, which increases the cost of the experiment. Utility Model Content

[0004] In order to solve the problem of high cost in the prior art of manufacturing a variety of bearing devices corresponding to Brazilian discs of different sizes, the utility model provides a rock Brazilian disc splitting strength testing device. The device is provided with two relative supports, and mounting rods are provided on the two supports. A crossbeam is provided at one end of the mounting rod away from the support, and an internal threaded sleeve is provided on the crossbeam. The two internal threaded sleeves are connected by positive and negative threads, so that the distance between the two supports can be adjusted to adapt to test rocks of different sizes. There is no need to replace different types of test devices, thereby reducing the experimental cost.

[0005] The utility model adopts the following technical solution to solve the above technical problems: a rock Brazilian disc splitting strength testing device, comprising a supporting mechanism for supporting the test rock and a loading mechanism for applying pressure to the test rock, the loading mechanism and the supporting mechanism are arranged up and down, and a testing space for accommodating the test rock Brazilian disc is formed between the supporting mechanism and the loading mechanism, the supporting mechanism comprises two relatively arranged supports, both supports are provided with mounting rods and protrusions for supporting the test rock, a crossbeam is provided at one end of the mounting rod away from the support, both crossbeams are provided with internal threaded sleeves, the two internal threaded sleeves are connected by positive and negative threads, and the positive and negative threads can drive the two internal threaded sleeves and the two supports to approach or move away during rotation, the loading mechanism comprises a loading pressure head for downwardly pressing the test rock and a connecting block fixedly connected to the loading pressure head, and the connecting block is provided on the portion of the positive and negative threads extending out of the internal threaded sleeve.

[0006] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the connecting block is in a strip shape, and a through groove is opened at one end of the connecting block along its length direction, and the through groove runs through two oppositely arranged side walls of the connecting block, and two clamping parts are formed on both sides of the through groove, and a clamping space for clamping the positive and negative threads is formed between the two clamping parts, and the loading pressure head is connected to the other end of the connecting block.

[0007] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the two clamping parts are commonly connected with a fastener for pulling the two clamping parts to deform, and the two clamping parts can clamp the positive and negative threads after deformation.

[0008] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the fastener includes a fastening bolt, which passes through the two clamping parts in sequence and is locked by a fastening nut, and a screw hole matching the fastening bolt is opened on the clamping part.

[0009] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: a pad for lifting the support is arranged at the bottom of the support, and the pad is wedge-shaped with the tip arranged downward.

[0010] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the two supports are connected by a telescopic piece.

[0011] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the telescopic part is set as a double-headed basket screw, and screw holes are opened on the two opposite surfaces of the two supports, and the two ends of the double-headed basket screw are respectively inserted into one of the screw holes.

[0012] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the telescopic part is arranged as a telescopic rod, one end of the telescopic rod is connected to one of the supports, and the other end of the telescopic rod is connected to the other support.

[0013] As a further optimization of the rock Brazilian disc splitting strength testing device of the utility model: the mounting rod is set as a bolt, and the screw part of the bolt passes through the support and the beam in sequence from bottom to top and is fastened by a nut.

[0014] Beneficial effect: The utility model sets two relative supports, the supports are provided with mounting rods, a crossbeam is set at one end of the mounting rod away from the support, and internal threaded sleeves are set on the crossbeams. The two internal threaded sleeves are connected by positive and negative threads. During the rotation of the positive and negative threads, the two internal threaded sleeves and the two supports can be driven to move closer or farther away, so that the distance between the two supports can be adjusted to adapt to test rocks of different sizes. There is no need to replace different types of test devices, thereby reducing the experimental cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 is a schematic diagram of the loading mechanism;

[0017] Figure numerals: 1. support, 101. spacer, 102. screw hole, 103. protrusion, 104. double-headed turnbuckle, 2. mounting rod, 3. crossbeam, 301. internal threaded sleeve, 302. positive and negative threads, 4. loading mechanism, 401. loading pressure head, 402. through groove, 403. fastening bolt, 5. test space. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further elaborated in detail below in conjunction with specific embodiments. The parts not described and disclosed in detail in the following embodiments of the present invention should be understood as the prior art known or should be known to those skilled in the art, such as the specific principle of the Brazilian test, the structure and model of the positive and negative threads 302, the structure and model of the double-headed basket screw 104, and the structure and model of the hydraulic cylinder and the jack.

[0019] Example 1

[0020] A rock Brazilian disc splitting strength test device, such as Figure 1 and Figure 2As shown, it includes a supporting mechanism for supporting the test rock and a loading mechanism 4 for applying pressure to the test rock. The loading mechanism 4 and the supporting mechanism are arranged up and down, and a test space 5 for accommodating the Brazilian disc of the test rock is formed between the supporting mechanism and the loading mechanism 4. The supporting mechanism includes two relatively arranged supports 1, and the two supports 1 are each provided with a mounting rod 2 and a protrusion 103 for supporting the test rock. A crossbeam 3 is provided at one end of the mounting rod 2 away from the support 1, and an internal threaded sleeve 301 is provided on the crossbeam 3. The two internal threaded sleeves 301 are connected by positive and negative threads 302. During the rotation of the positive and negative threads 302, the two internal threaded sleeves 301 and the two supports 1 can be driven to approach or move away. The loading mechanism 4 includes a loading pressure head 401 for pressing the test rock downward and a connecting block fixedly connected to the loading pressure head 401, and the connecting block is provided on the part of the positive and negative threads 302 extending out of the internal threaded sleeve 301.

[0021] When testing the test rock, the test rock is placed in the test space 5, and the distance between the supports 1 is adjusted according to the size of the test rock. The positive and negative threads 302 are twisted. Since the threads at both ends of the positive and negative threads 302 are in opposite directions, when the positive and negative threads 302 are rotated, both ends of the positive and negative threads 302 will simultaneously extend into or extend out of the internal thread sleeve 301, thereby reducing or increasing the distance between the two internal thread sleeves 301, and the internal thread sleeve 301 is arranged on the crossbeam 3, and the crossbeam 3 is arranged at the end of the mounting rod 2 away from the support 1, and finally the distance between the two supports 1 is reduced or increased. When it moves to a suitable distance, the rotation of the positive and negative threads 302 is stopped. At this time, the distance between the two supports 1 matches the size of the test rock and can be loaded and tested with the loading mechanism 4. When the distance between the two supports 1 is properly adjusted, the loading mechanism 4 applies pressure for testing. The specific testing principle is the prior art in the art and will not be described in detail here. In order to ensure that the loading mechanism 4 works smoothly, the connection block of the loading mechanism 4 is set on the part where the positive and negative threads 302 extend out of the internal thread sleeve 301, and the loading pressure head 401 presses the test rock downward. The test of the Brazilian disc splitting strength of the rock in the utility model is the Brazilian test. The loading pressure head 401 can be a jack or a hydraulic cylinder.

[0022] The above is a basic implementation method of the utility model, which can be further improved, optimized and limited on the basis of the above to obtain the following embodiments:

[0023] Example 2

[0024] This embodiment is an improved solution based on the embodiment 1, and its main structure is the same as that of the embodiment 1, and the improvement is that: in order to ensure that the connection block of the loading mechanism 4 can be conveniently and stably fixed on the part of the positive and negative threads 302 extending out of the internal thread sleeve 301, the connection block is strip-shaped, and a through groove 402 is provided at one end of the connection block along its length direction, and the through groove 402 runs through two oppositely arranged side walls of the connection block, and two clamping parts are formed on both sides of the through groove 402, and a clamping space for clamping the positive and negative threads 302 is formed between the two clamping parts, and the loading pressure head 401 is connected to the other end of the connection block. The two clamping parts are commonly connected with a fastener for pulling the two clamping parts to deform, and the two clamping parts can clamp the positive and negative threads 302 after deformation.

[0025] Example 3

[0026] This embodiment is an improvement on the embodiment 2, and its main structure is the same as that of the embodiment 2, with the improvement being that the portion of the positive and negative threads 302 extending out of the internal threaded sleeve 301 is placed in the clamping space for tightening. To ensure the tightening effect and efficiency, the fastener includes a tightening bolt 403, which passes through the two clamping parts in sequence and is tightened by a tightening nut, and a screw hole 102 matching the tightening bolt 403 is provided on the clamping part.

[0027] Example 4

[0028] This embodiment is an improved solution made on the basis of embodiment 1, and its main structure is the same as embodiment 1, and the improvement is that the mounting rod 2 is set as a bolt, and the screw part of the bolt passes through the support 1 and the crossbeam 3 from bottom to top in sequence and is fastened by a nut. The head of the bolt will eventually be at the bottom of the support 1, so that the contact between the support 1 and the laboratory desktop will be affected, so that the support 1 cannot be placed stably on the desktop. Therefore, a certain space needs to be reserved at the bottom of the support 1 to accommodate the head of the bolt, so a pad 101 for lifting the support 1 is arranged at the bottom of the support 1, so that there is a height of the pad 101 between the support 1 and the desktop, which will not interfere with the stable placement of the support 1 on the desktop. In order to leave more space and not limit the bolt installation, the pad 101 is wedge-shaped and the tip is set downward, so that the volume of the pad 101 itself will not be too large, and the moving range of the mounting rod 2 in the vertical direction will also increase. In this way, not only the horizontal distance between the supports 1 increases, but the loading mechanism 4 can also be adjusted in the vertical direction with the movement of the mounting rod 2, so that the adjustment range of the test space 5 becomes larger. At the same time, the tip of the cushion block 101 is set downward, so that the contact area of ​​the cushion block 101 on the desktop is reduced. When the pressure is constant, the smaller the contact area, the greater the pressure, so the support 1 is not easy to deviate.

[0029] Example 5

[0030] This embodiment is an improvement on the embodiment 1, and its main structure is the same as that of the embodiment 1, with the improvement being that in order to ensure the stability of the connection between the supports 1, the two supports 1 are connected by a telescopic member.

[0031] Example 6

[0032] This embodiment is an improved solution based on the embodiment 5, and its main structure is the same as that of the embodiment 5, and the improvement is that: the telescopic member is set as a double-headed basket screw 104, and screw holes 102 are opened on the two opposite surfaces of the two supports 1, and the two ends of the double-headed basket screw 104 are respectively inserted into one of the screw holes 102. If it is set as a double-headed basket screw 104, in addition to playing a role in stabilizing the connection, it also has a function of preventing accidental contact, that is, when the positive and negative threads 302 are accidentally turned, since the double-headed basket screw 104 does not turn, the distance between the supports 1 will not change. If you want to adjust the distance between the supports 1, you need to adjust the double-headed basket screw 104 and the positive and negative threads 302 together. When the double-headed basket screw 104 is turned in different directions, the two ends of the double-headed basket screw 104 can extend into or out of the support 1 at the same time due to the different thread directions.

[0033] Example 7

[0034] This embodiment is an improvement on the embodiment 5, and its main structure is the same as that of the embodiment 5, with the improvement being that the telescopic member is arranged as a telescopic rod, one end of the telescopic rod is connected to one of the supports 1, and the other end of the telescopic rod is connected to the other support 1.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rock Brazilian disk splitting strength test device, comprising a support mechanism for supporting a test rock and a loading mechanism (4) for applying pressure to the test rock, the loading mechanism (4) and the support mechanism being arranged vertically, and a test space (5) for accommodating a test rock Brazilian disk is formed between the support mechanism and the loading mechanism (4), characterized in that: The support mechanism comprises two supports (1) arranged opposite to each other, the two supports (1) are each provided with a mounting rod (2) and a protrusion (103) for supporting a test rock, a crossbeam (3) is provided at one end of the mounting rod (2) away from the support (1), an internal thread sleeve (301) is provided on the crossbeam (3), the two internal thread sleeves (301) are connected via a positive and negative thread (302), and the positive and negative thread (302) can drive the two internal thread sleeves (301) and the two supports (1) to move closer or farther apart during rotation, and the loading mechanism (4) comprises a loading pressure head (401) for pressing the test rock downward and a connecting block fixedly connected to the loading pressure head (401), the connecting block being provided on a portion of the positive and negative thread (302) extending out of the internal thread sleeve (301).

2. The rock Brazilian disc splitting strength test device according to claim 1, characterized in that: The connecting block is strip-shaped, and a through slot (402) is provided at one end of the connecting block along its length direction, and the through slot (402) passes through two oppositely arranged side walls of the connecting block, two clamping parts are formed on both sides of the through slot (402), and a clamping space for clamping the positive and negative threads (302) is formed between the two clamping parts, and the loading pressure head (401) is connected to the other end of the connecting block.

3. The rock Brazilian disc splitting strength test device according to claim 2, characterized in that: The two clamping parts are commonly connected to a fastener used to pull the two clamping parts to deform, and the two clamping parts can clamp the positive and negative threads (302) after deformation.

4. The rock Brazilian disc splitting strength test device according to claim 3, characterized in that: The fastener comprises a fastening bolt (403), which passes through the two clamping parts in sequence and is then tightened by a fastening nut, and a screw hole matching the fastening bolt (403) is provided on the clamping part.

5. The rock Brazilian disc splitting strength test device according to claim 1, characterized in that: A cushion block (101) for lifting the support (1) is arranged at the bottom of the support (1); the cushion block (101) is wedge-shaped with the tip thereof arranged downward.

6. The rock Brazilian disc splitting strength testing device according to claim 1, characterized in that: The two supports (1) are connected via a telescopic member.

7. The rock Brazilian disc splitting strength test device according to claim 6, characterized in that: The telescopic member is configured as a double-headed basket screw (104), and screw holes (102) are provided on two opposite surfaces of the two supports (1), and two ends of the double-headed basket screw (104) are respectively inserted into one of the screw holes (102).

8. The rock Brazilian disc splitting strength test device according to claim 6, characterized in that: The telescopic member is configured as a telescopic rod, one end of the telescopic rod is connected to one of the supports (1), and the other end of the telescopic rod is connected to the other support (1).

9. The rock Brazilian disc splitting strength testing device according to claim 1, characterized in that: The mounting rod (2) is configured as a bolt, and the screw portion of the bolt passes through the support (1) and the crossbeam (3) in sequence from bottom to top and is then fastened by a nut.

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