A triaxial stress loading and unloading device for coal rock characteristic dynamic change experiment

Abstract

The application discloses a triaxial stress loading and unloading device for coal rock characteristic dynamic change experiment, which comprises a containing seat, an accommodating groove is formed in the containing seat, a detection body is placed in the accommodating groove, the accommodating groove is provided through along the Z direction upward and along the Y direction forward, a loading block is slidingly arranged in the accommodating groove and is driven by an external loading lead screw, so that Z direction loading and Y direction loading are formed respectively, a data collection assembly and an X direction loading assembly for detecting the X direction of the detection body are arranged, the X direction loading assembly can apply direct pressure and indirect pressure to the detection body, and liquid fluid and gaseous fluid are introduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal rock characteristic experiment equipment, and particularly relates to a triaxial stress loading and unloading device for coal rock characteristic dynamic change experiment. BACKGROUND

[0002] In order to simulate the stratum pressure condition to measure the properties of coal rock and master the rules of coal rock to improve the actual strain capacity, the corresponding experiment equipment is usually used to detect the coal rock. The existing experiment equipment has a single experiment mode, and can only perform dynamic experiment on a certain characteristic of the coal rock. When experiments on multiple characteristics of the coal rock are performed, the equipment needs to be replaced, which is relatively cumbersome, and the experiments cannot be combined, and the actual complex coal rock characteristics cannot be effectively supported by theory.

[0003] Therefore, it is necessary to provide a triaxial stress loading and unloading device for coal rock characteristic dynamic change experiment to solve the above problems. SUMMARY

[0004] To achieve the above object, the present application provides the following technical scheme: a triaxial stress loading and unloading device for coal rock characteristic dynamic change experiment, comprising:

[0005] A containing seat, which is internally provided with a containing groove for placing a detection body, and the containing groove is provided through along the Z direction upward and along the Y direction forward;

[0006] A loading block, which is slidingly arranged in the containing groove and is driven by an external loading lead screw, so as to form Z direction loading and Y direction loading respectively; and

[0007] A data collection assembly and an X direction loading assembly for detecting the X direction of the detection body, wherein the X direction loading assembly can apply direct pressure, indirect pressure, liquid fluid and gaseous fluid to the detection body.

[0008] Further, as a preferred, the data collection assembly comprises:

[0009] A first detection shaft, which is arranged in a first through hole provided through along the X direction leftward from the containing groove, and a first strain gauge is embedded in the first detection shaft;

[0010] A second detection shaft, which is arranged in a second through hole provided through along the X direction rightward from the containing groove, and a second strain gauge is embedded in the second detection shaft; and

[0011] A limiting shaft, which is fixedly embedded in the second through hole and used for limiting the position of the second detection shaft;

[0012] And the first strain gauge and the second strain gauge can transmit stress data to a detector.

[0013] Further, as preferred, the first detection shaft, the second detection shaft and the middle part of the limiting shaft are all provided with through holes, and one end of the limiting shaft is connected to the collecting cylinder through a connecting pipe.

[0014] Further, as preferred, the collecting cylinder is placed on a weighing device.

[0015] Further, as preferred, one side of the collecting cylinder is provided with a negative pressure device for continuously sucking the detection body.

[0016] Further, as preferred, the connecting pipe is provided with a valve body.

[0017] Further, as preferred, the inner surface of the accommodating groove is attached with a sealing gasket.

[0018] Further, as preferred, the X-direction loading assembly comprises:

[0019] a base cylinder;

[0020] a cylinder body fixedly embedded in the base cylinder, and a piston is sealingly and slidably arranged in the cylinder body, one end of the piston is coaxially fixed with a drive rod sliding back and forth along the X-direction, and the drive rod sequentially penetrates the cylinder body and the base cylinder; and

[0021] a supply rod fixed to the side of the piston away from the drive rod and sealingly and slidably penetrating the cylinder body, and the supply rod and the drive rod are both hollow structures and are connected in communication, and the supply rod is supplied with liquid or gaseous fluid by an external supply device.

[0022] Further, as preferred, the cylinder body is embedded with connecting heads distributed on both sides of the piston for connection with an external hydraulic control device;

[0023] The cylinder body is also embedded with an electromagnet clamped on the outside of the drive rod, and the electromagnet can provide damping for the drive rod, and the damping strength is adjustable.

[0024] Further, as preferred, the mounting cylinder is fixed with a mounting plate on the side away from the base cylinder, the mounting plate is slidably embedded with a plurality of impact heads and a centralizing cylinder for providing centralization for the drive rod;

[0025] One end of the impact head is connected to an impact plate, and the impact plate is driven by an impact cylinder.

[0026] Compared with the prior art, the present application provides a triaxial stress loading and unloading device for coal rock property dynamic change experiment, which has the following beneficial effects:

[0027] In the embodiment of the present application, the X-direction loading assembly can apply direct pressure and indirect pressure to the detection body, and liquid and gaseous fluids can be introduced, and the data collection assembly and the X-direction loading assembly can be used in cooperation to realize "one machine with multiple functions", and various dynamic change experiments on coal rock can be realized, including: 1. Realizing the transmission of different pressures on different detection bodies and the tolerance of different detection bodies to different pressures; 2. Realizing the determination of rock sample porosity; 3. Realizing gas diffusion experiments; and the effect of the experiments can be improved by the control variable method, and effective theoretical support can be provided for the actual characteristics of complex coal mine coal rock. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a schematic diagram of the overall structure of a triaxial stress loading and unloading device for dynamic change experiments on coal rock characteristics;

[0029] Fig. 2 It is a schematic diagram of the structure of an X-direction loading assembly in a triaxial stress loading and unloading device for dynamic change experiments on coal rock characteristics;

[0030] Fig. 3 It is a schematic diagram of the structure of an X-direction loading assembly in a triaxial stress loading and unloading device for dynamic change experiments on coal rock characteristics;

[0031] In the figure: 1, a containing seat; 2, a containing groove; 3, a detection body; 4, a loading block; 5, a loading screw; 7, an X-direction loading assembly; 61, a first detection shaft; 62, a second detection shaft; 63, a limiting shaft; 64, a detector; 65, a connecting pipe; 66, a collection cylinder; 67, a negative pressure device; 71, a base cylinder; 72, a mounting cylinder; 73, a driving rod; 74, a piston; 75, a cylinder body; 76, a feeding rod; 77, a centralizing cylinder; 78, a sealing head; 79, an electromagnet; 711, a mounting plate; 712, an impact head; 713, an impact plate; 714, an impact cylinder. DETAILED DESCRIPTION

[0032] Please refer to Figs. 1-3 The present application provides a triaxial stress loading and unloading device for dynamic change experiments on coal rock characteristics, comprising:

[0033] The containing seat 1 has a containing groove formed therein for placing the detection body 3, and the containing groove is provided through in the Z-direction upward and in the Y-direction forward;

[0034] The loading block 4 is slidingly arranged in the containing groove and is driven by the external loading screw 5, thereby forming Z-direction loading and Y-direction loading, respectively; and

[0035] A data collection assembly and an X-direction loading assembly 7 for detecting the X-direction of the detection body 3, wherein the X-direction loading assembly 7 can apply direct pressure, indirect pressure to the detection body; and pass liquid or gaseous fluid, so as to realize "one machine with multiple functions", and realize various dynamic change experiments on coal rock.

[0036] The data collection assembly comprises:

[0037] A first detection shaft 61 is arranged in a first through hole which is arranged through from the accommodating groove 2 along the X-direction to the left, and the first detection shaft 61 is embedded with a first strain gauge;

[0038] A second detection shaft 62 is arranged in a second through hole which is arranged through from the accommodating groove 2 along the X-direction to the right, and the second detection shaft 62 is embedded with a second strain gauge; and

[0039] A limiting shaft 63 is fixedly embedded in the second through hole, and is used for limiting the position of the second detection shaft 62.

[0040] The first strain gauge and the second strain gauge can both transmit stress data to a detector 64.

[0041] Therefore, in the implementation, the external loading lead screw 5 drives the loading block 4 to form Z-direction loading and Y-direction loading; the X-direction loading assembly 7 can be used to apply direct pressure or indirect pressure to the first detection shaft, and then the pressure is transmitted to the second detection shaft through the detection body, wherein the first strain gauge in the first detection shaft 61 and the second strain gauge in the second detection shaft can both transmit the pressure data to the detector 64 for recording and analysis, so as to obtain the transmission of different detection bodies under different pressures and the tolerance of different detection bodies under different pressures.

[0042] In addition, in order to facilitate the determination of the porosity of the rock sample or the gas diffusion experiment, through holes are arranged in the middle of the first detection shaft 61, the second detection shaft 62 and the limiting shaft 63, and one end of the limiting shaft 63 is connected with the collecting cylinder 66 through the connecting pipe 65.

[0043] In this way, in the rock sample porosity experiment, the external loading lead screw 5 drives the loading block 4 to form Z-direction loading and Y-direction loading, and the X-direction loading assembly 7 is used to apply X-direction loading to the first detection shaft and supply liquid, and the liquid enters the collecting cylinder through the first detection shaft, the detection body, the second detection shaft, the limiting shaft and the connecting pipe, so as to realize the seepage characteristic experiment of the rock sample, and in the experiment process, the influence of each variable on the seepage can be analyzed by the control variable method, such as changing the supply amount of the liquid, the supply pressure of the liquid, the loading pressure of the X, Y and Z directions and replacing different detection bodies.

[0044] As a preferred embodiment, the collecting cylinder 66 is placed on a scale, so that the weight of the fluid can be calculated directly by measuring the weight of the collecting cylinder itself and the weight of the collecting cylinder after collecting the fluid, improving the experimental efficiency.

[0045] In addition, the device can also be used for gas diffusion test. A negative pressure device 67 is arranged on one side of the collecting cylinder 66 for continuously sucking the test body 3.

[0046] Therefore, during the experiment, the driving rod is kept in a closed state and abuts against one side of the first detection shaft. The external loading screw 5 is used to drive the loading block 4 to form Z-direction loading and Y-direction loading. Then, the negative pressure device is used to vacuumize the accommodating groove. At this time, eight hours are kept. Then, the driving rod is used to inject a certain pressure of gas into the first detection shaft. The valve body is closed and kept for eight hours. Then, the valve body is opened. The collecting cylinder is used to collect the gas, so as to realize the gas diffusion experiment. In addition, the influence of each variable on the gas can be analyzed by the control variable method, such as changing the loading pressure in X, Y and Z directions and replacing different test bodies.

[0047] As a preferred embodiment, the connecting pipe 65 is provided with a valve body.

[0048] As a preferred embodiment, a sealing gasket is attached to the inner surface of the accommodating groove, so as to improve the sealing performance of the whole experiment and reduce the experimental error.

[0049] In the embodiment, the X-direction loading assembly 7 includes a base cylinder 71. Fig. 2 3 The X-direction loading assembly 7 includes a base cylinder 71.

[0050] A cylinder body 75 is fixedly embedded in the base cylinder 71. A piston 74 is sealingly and slidably arranged in the cylinder body. One end of the piston 74 is coaxially fixed with a driving rod 73 which slides back and forth in the X direction. The driving rod 73 sequentially penetrates the cylinder body 75 and the base cylinder 71.

[0051] A supply rod 76 is fixed to the side of the piston 74 away from the driving rod 73 and sealingly and slidably penetrates the cylinder body 75. The supply rod 76 and the driving rod 73 are both hollow structures and are connected in communication. The supply rod is supplied with liquid or gaseous fluid by an external supply device.

[0052] In addition, the end of the driving rod 73 close to the accommodating seat can also be sleeved with a sealing head 78, so as to improve the sealing performance of the fluid supply.

[0053] In addition, the cylinder body 75 is embedded with connecting heads distributed on both sides of the piston 74 for being connected with an external hydraulic control device.

[0054] ​The cylinder further embeds an electromagnet 79 which tightly embraces the outside of the driving rod 73, and the electromagnet 79 can provide damping for the driving rod 73, and the damping strength is adjustable.

[0055] In order to realize the application of indirect pressure, the mounting cylinder 72 is fixed with a mounting plate 711 on the side away from the base cylinder 71, a plurality of impact heads 712 are slidingly embedded in the mounting plate 711, and a centralizing cylinder 77 is provided to centralize the driving rod 73;

[0056] One end of the impact head 712 is connected to an impact plate 713, and the impact plate 713 is driven by an impact cylinder 714.

[0057] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A triaxial stress loading and unloading device for coal rock property dynamic change experiment, characterized in that: The utility model relates to a kind of detection device for detecting the X direction of detection body (3), including: The accommodation seat (1) is internally provided with accommodating groove, for placing detection body (3), and accommodating groove is provided along Z direction upwardly, along Y direction forwardly; Loading block (4) is slidably arranged in the accommodating groove, and is driven by external loading screw (5), to form Z direction loading and Y direction loading respectively; Data collection assembly and X direction loading assembly (7) for detecting the X direction of detection body (3), the X direction loading assembly (7) can apply direct pressure, indirect pressure to detection body, pass into liquid fluid, gaseous fluid; The data collection assembly includes: First detection shaft (61) is placed in first through hole, the first through hole is provided along X direction left from accommodating groove (2), and first detection shaft (61) is embedded with first strain gauge; Second detection shaft (62) is placed in second through hole, the second through hole is provided along X direction right from accommodating groove (2), and second detection shaft (62) is embedded with second strain gauge; Limiting shaft (63) is fixedly embedded in second through hole, for limiting the position of second detection shaft (62); And the first strain gauge and second strain gauge can transmit stress data to detector (64); The middle part of the first detection shaft (61), second detection shaft (62) and limiting shaft (63) is provided with through hole, and one end of the limiting shaft (63) is also connected with the collecting cylinder (66) by the connecting pipe (65). The X direction loading assembly (7) includes: Base cylinder (71); Cylinder body (75) is fixedly embedded in the base cylinder (71), and the cylinder body is sealingly slidably provided with a piston (74), one end of the piston (74) is coaxially fixed with a drive rod (73) that slides back and forth along the X direction, the drive rod (73) passes through the cylinder body (75) and the base cylinder (71) in sequence; Supply rod (76) is fixed to the side of the piston (74) away from the drive rod (73), and sealingly slides out of the cylinder body (75), and the supply rod (76) and the drive rod (73) are both hollow structures, and are connected in communication, and the supply rod is supplied with liquid fluid or gaseous fluid by an external supply device; The side of the base cylinder (71) close to the accommodation seat (1) is provided with a mounting cylinder (72), the side of the mounting cylinder (72) away from the base cylinder (71) is fixed with a mounting plate (711), the mounting plate (711) is slidably embedded with a plurality of impact heads (712) and a righting cylinder (77) for providing righting for the drive rod (73); One end of the impact head (712) is connected to an impact plate (713), and the impact plate (713) is driven by an impact cylinder (714); The cylinder body (75) further embedded with an electromagnet (79) that clings to the outside of the drive rod (73), the electromagnet (79) can provide damping for the drive rod (73), and the damping strength is adjustable.

2. The triaxial stress loading and unloading device for coal rock property dynamic change experiment according to claim 1, characterized in that: The collecting cylinder (66) is placed on a weighing device.

3. The triaxial stress loading and unloading device for coal rock property dynamic change experiment according to claim 1, characterized in that: One side of the collecting cylinder (66) is provided with a negative pressure device (67) for continuously suctioning the detection body (3).

4. The triaxial stress loading and unloading device for coal rock property dynamic change experiment according to claim 1, characterized in that: The connecting pipe (65) is provided with a valve body.

5. The triaxial stress loading and unloading device for coal rock property dynamic change experiment according to claim 1, characterized in that: The inner surface of the accommodating groove is attached with a sealing gasket.

6. The triaxial stress loading and unloading device for coal rock property dynamic change experiment according to claim 1, characterized in that: The cylinder (75) is embedded with connecting heads distributed on both sides of the piston (74) for connecting with external hydraulic control equipment.

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