Crushed rock sample circumferential pressure-bearing device of Hopkinson pressure bar system

Abstract

The utility model relates to the technical field of broken rock sample circumferential pressure bearing, and discloses a broken rock sample circumferential pressure bearing device of a Hopkinson pressure bar system, which is characterized in that a transmission shaft and a sliding rail are arranged on a base, and a sliding block matched and connected with the bottom of a pressure bearing body part is arranged on the sliding rail; a shaft block arranged on the transmission shaft is stably connected with the pressure-bearing body part, and an adjusting spinning roller used for enabling the shaft block to drag the pressure-bearing body part to stably and horizontally move is arranged at the end part of the transmission shaft; the upper end part of the pressure-bearing body part is provided with a shunting pipe communicated with the leading-in tee joint; a main leading-in pipe at the lower end of the pressure-bearing body part is communicated with a pressure relief pipe; and the two ends of the axial cavity of the pressure-bearing body part are respectively connected with the two pressure-bearing end covers in a pressing manner. Experiment errors can be effectively reduced, meanwhile, the sealing performance is reliable, the success rate of a test experiment is ensured, the structure and the sealing form are simple and reliable, and the requirements of confining pressure loading in a natural water medium environment and application in the field of broken rock sample circumferential testing can be simulated.

Description

Technical Field

[0001] The utility model relates to the technical field of annular pressure bearing of crushed rock samples, in particular to an annular pressure bearing device of a crushed rock sample of a Hopkinson pressure bar system. Background Art

[0002] The Hopkinson bar system is a test device for studying the dynamic mechanical properties of materials under strain loading. It conducts systematic experiments on the pressure and seepage characteristics of crushed rock specimens in the axial, circumferential, and impact load conditions in natural water environments. The test equipment required must meet the requirements of the Hopkinson bar system's experimental process, subjecting the crushed rock specimens to radial confining pressure loads while also simulating the impact of natural water medium penetration testing on the specimens' dynamic mechanical properties. To this end, a Hopkinson bar system circumferential pressure-bearing device for crushed rock specimens was designed. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the purpose of the utility model is to provide a Hopkinson bar system rock crushing sample annular pressure-bearing device and method, which is a technical device for testing loading and penetration in a water medium confining pressure environment. Its appearance and structure are reasonable, the manufacturing cost is low, and the test control is reliable.

[0004] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0005] A rock sample circumferential pressure-bearing device for a Hopkinson pressure bar system comprises: a base, a transmission shaft, a slide rail, and a pressure-bearing body component. The base is fixedly mounted on a system base surface, and the transmission shaft and slide rail are provided on the slide rail. A slider is provided on the slide rail and is engaged with the bottom of the pressure-bearing body component. A shaft block is provided on the transmission shaft and is firmly connected to the pressure-bearing body component. An adjustment wheel is provided at the end of the transmission shaft for causing the shaft block to drag the pressure-bearing body component for smooth horizontal movement.

[0006] A shunt pipe connected to the inlet tee is provided at the upper end of the pressure-bearing component, and a main inlet pipe is provided at the lower end of the pressure-bearing component, which is connected to the pressure relief pipe. The two ends of the axial cavity of the pressure-bearing component are respectively pressed and connected with two pressure-bearing end covers, and the coaxiality of the two pressure-bearing end covers coincides and is parallel to the base plane.

[0007] Ring sleeves and pads are placed on the inner wall of the symmetrical test hole cavity of the pressure-bearing body component. The two outer ends of the ring sleeves and pads are respectively clamped and contacted with rod A1 and rod A2 inserted into the positioning guide sleeve. There are broken rock samples located in the middle of the pressure-bearing body at the clamping positions of both ends of the ring sleeves and pads.

[0008] The invention discloses a rock-crushing annular pressure-bearing device of a Hopkinson pressure bar system. The upper end of the pressure-bearing body component is provided with a perspective mirror with high light transmittance and anti-fogging ability, and a tightly pressed lens cover is provided on the perspective mirror.

[0009] Due to the adoption of the above-mentioned technical solution, the utility model has the following advantages:

[0010] A circumferential pressure-bearing device for crushed rock samples of a Hopkinson pressure bar system has a reasonable structural design, a simple manufacturing process, and is easy to assemble and operate. Accurately clamping the sample can effectively reduce experimental errors, while its reliable sealing performance ensures the success rate of the test experiment. The structure and sealing form are simple and reliable, and the test operation is convenient to use. It can simulate the application requirements of confining pressure loading and circumferential testing of crushed rock samples in a natural water medium environment. The hardware equipment required for the test has few limitations and can expand the application of the structural devices of existing conventional system loading technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the rock sample annular pressure-bearing device of the Hopkinson pressure bar system.

[0012] Figure 2 for Figure 1 Side view of;

[0013] Figure 3 for Figure 1 Top view of .

[0014] In the figure: base 1, transmission shaft 2, slide rail 3, adjustment wheel 4, inlet tee 5, perspective mirror 6, lens pressure cover 7, diverter pipe 8, pressure-bearing body component 9, pressure-bearing end cover 10, positioning guide sleeve 11, crushed rock sample 12, ring sleeve and pad 13, main inlet pipe 14, pressure relief pipe 15. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] like Figure 1 、 2 3, a circumferential pressure-bearing device for a rock-crushing sample of a Hopkinson pressure bar system, comprising: a base 1, a transmission shaft 2, a slide rail 3, and a pressure-bearing body component 9. The base 1, which is firmly fixed on the system base surface, is provided with a transmission shaft 2 and a slide rail 3. The slide rail 3 is provided with a slider that cooperates with the bottom of the pressure-bearing body component 9; a shaft block provided on the transmission shaft 2 is firmly connected to the pressure-bearing body component 9, and an adjustment wheel 4 is provided at the end of the transmission shaft 2 for causing the shaft block to drag the pressure-bearing body component for smooth horizontal movement;

[0017] The upper end of the pressure-bearing body part 9 is provided with a shunt pipe 8 connected to the inlet tee 5, and the lower end of the pressure-bearing body part 9 is provided with a main inlet pipe 14, which is connected to the pressure relief pipe 15; the two ends of the axial cavity of the pressure-bearing body part (9) are respectively pressed and connected with two pressure-bearing end covers 10, and the coaxiality of the two pressure-bearing end covers coincides and is parallel to the base plane; the inner wall of the symmetrical test hole cavity of the pressure-bearing body part 9 is provided with a ring sleeve and a pad 13, and the two outer ends of the ring sleeve and the pad 13 are respectively clamped and contacted with the rod A1 and the rod A2 inserted into the positioning guide sleeve 11, and the clamping positions of the two ends of the ring sleeve and the pad 13 are provided with a crushed rock sample 12 located in the middle position of the pressure-bearing body. The upper end of the pressure-bearing body part 9 is provided with a perspective mirror 6 with high light transmittance and anti-fogging ability, and the perspective mirror 6 is provided with a lens pressure cover 7 that is pressed and pressed.

[0018] A method for applying an annular pressure-bearing device to crushed rock samples using a Hopkinson bar system is as follows: a conventional Hopkinson bar system is used to establish an annular confining pressure device, and the axial displacement of a slide rail under an impact load and the closed structure of a water medium loading pressure-bearing body are used to act on the tested rod and crushed rock sample to apply an annular pressure-bearing impact load to the rod system, thereby obtaining the compressive condition and stress-strain curve of the test sample. The steps are as follows:

[0019] 1) Installation of the annular pressure-bearing device for crushed rock samples:

[0020] a. Secure the circumferential confining pressure device to the system base through base 1.

[0021] b. The slide rail 3 of the circumferential confining pressure device is connected and fastened to the upper surface of the base, and the slide rail 3 is smoothly connected with the bottom slider of the pressure-bearing member 9;

[0022] c. Install the drive shaft 2, the shaft block provided on the drive shaft 2 and firmly connected to the pressure-bearing member 9;

[0023] d. Install an adjustment wheel 4 at the end of the transmission shaft to ensure flexible rotation and smooth horizontal movement of the pressure-bearing components dragged by the shaft block;

[0024] e. A sight glass (6) with high light transmittance and anti-fogging capability is installed on the upper portion of the pressure-bearing member 9, and the gland 7 is tightly pressed after sealing to facilitate observation during the experiment;

[0025] f. The introduction tee 5 and the diverter pipe 8 are connected to the corresponding positions at the upper end of the pressure-bearing member 9;

[0026] g. Install the main inlet pipe 14 and the pressure relief pipe 15 into the corresponding position of the joint at the lower end of the pressure-bearing member 9;

[0027] h. The two pressure-bearing end covers 10 are respectively pressed and installed at both ends of the axial cavity of the pressure-bearing body. During the installation process, the coaxiality of the two end covers must coincide and be parallel to the base plane;

[0028] 2) Working method of the rock sample annular pressure device:

[0029] a. First, the molded rock sample 12 is loaded into the ring sleeve and placed in the center of the pressure-bearing member 9;

[0030] b. The ring sleeve and the spacer 13 are respectively installed into the inner wall of the pressure-bearing member 9 symmetrical test cavity, respectively, the test cavity has been installed in the ring sleeve and the spacer 13 at both ends of the clamping;

[0031] c. Through the cooperation of the system and the equipment base, the rod A1 and the rod A2 are inserted into the positioning guide sleeve (11), and the rock sample 12 is adjusted so that it is located in the middle position of the pressure body;

[0032] d. Through the inlet pipe on the connected and sealed annular pressure-bearing body, load the corresponding water medium pressure into the annular cavity environment of the pressure-bearing body according to the test system requirements, and perform impact, loading, and penetration of the system rod system dynamic performance;

[0033] The test application completes the compression rod test and the circumferential confining pressure load of the crushed rock sample, and can also simulate the pressure process observation experiment on the influence of natural water medium conditions on the mechanical properties of the crushed rock sample.

[0034] The working principle of the utility model is as follows: a conventional Hopkinson pressure bar system is established as a circumferential confining pressure device by designing the structural form of the device, and the axial displacement of the slide rail under the impact load and the closed structure of the water medium loading pressure body are used to act on the tested rod and crushed rock specimens to perform circumferential pressure impact load loading on the rod system, and the compressive condition and stress-strain curve of the test specimen are obtained. That is, by coordinating the use of the circumferential confining pressure loading and the system loading rod system in the Hopkinson pressure rod system, the pressure is applied to the outer surface of the flexible ring sleeve to form a reliable test sealing effect on the inner wall and the outer circle of the rod diameter to carry out the circumferential pressure of the sample. The flexible ring sleeve is inserted into the inner wall of the test hole of the pressure-bearing body, and the molded rock sample and the pad are respectively installed in the ring sleeve and placed in the center of the pressure-bearing body. Then, through the coordinated adjustment of the system and the equipment base, the positioning guide sleeves are inserted into the rods 1 and 2, and the two ends of the installed pads are respectively clamped so that the rock sample is centered in the middle position of the pressure-bearing body, which facilitates the observation of the change process of the pressurized test sample through the perspective window on the upper part of the pressure-bearing body. The corresponding water medium pressure is loaded into the circumferential cavity environment of the pressure-bearing body according to the requirements of the test system through the inlet pipeline on the connected and sealed confining pressure-bearing body to start the impact loading penetration effect test application experiment of the dynamic mechanical properties of the system rod system.

Claims

1. A rock sample annular pressure-bearing device for a Hopkinson pressure bar system, characterized by comprising: A base (1), a transmission shaft (2), a slide rail (3), and a pressure-bearing body component (9); the base (1) is firmly fixed on the system base surface and is provided with a transmission shaft (2) and a slide rail (3); the slide rail (3) is provided with a slider that cooperates with the bottom of the pressure-bearing body component (9); the shaft block provided on the transmission shaft (2) is firmly connected to the pressure-bearing body component (9); the end of the transmission shaft (2) is provided with an adjustment wheel (4) for allowing the shaft block to drag the pressure-bearing body component to move smoothly horizontally; The upper end of the pressure-bearing body component (9) is provided with a shunt pipe (8) connected to the inlet tee (5), and the lower end of the pressure-bearing body component (9) is provided with a main inlet pipe (14), which is connected to the pressure relief pipe (15); the two ends of the axial cavity of the pressure-bearing body component (9) are respectively pressed and connected with two pressure-bearing end covers (10), and the coaxiality of the two pressure-bearing end covers coincides and is parallel to the base plane; A ring sleeve and a pad (13) are placed on the inner wall of the symmetrical test hole of the pressure-bearing body component (9). The two outer ends of the ring sleeve and the pad (13) are respectively clamped and contacted with the rod A1 and the rod A2 inserted into the positioning guide sleeve (11). The clamping positions at both ends of the ring sleeve and the pad (13) are provided with a crushed rock sample (12) located in the middle of the pressure-bearing body.

2. The circumferential pressure-bearing device for crushing rock samples of a Hopkinson pressure bar system according to claim 1, characterized in that: A perspective mirror (6) with high light transmittance and anti-fogging capability is arranged on the upper end of the pressure-bearing body component (9), and a lens pressure cover (7) is arranged on the perspective mirror (6) for tight compression.

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