Coal rock mass uniaxial compression deformation experimental device

Abstract

The utility model relates to a coal and rock mass uniaxial compression deformation experimental device which comprises a bottom plate, a placing disc fixed in the middle of the bottom plate, a pressing disc arranged right above the placing disc, a lifting oil cylinder connected above the pressing disc, a supporting plate fixed on the lifting oil cylinder, supporting arm rods fixed at four corners of the bottom of the supporting plate, and the bottoms of the supporting arm rods fixed with the bottom plate. A coal and rock mass sample is placed between the pressure plate and the placement plate, a strain gauge is adhered to the coal and rock mass sample, and the strain gauge is connected with a resistance strain gauge. The uniaxial compression deformation experiment device can be specially used for a uniaxial compression deformation experiment of a coal rock mass, the change of resistance in the strain gauge after the strain gauge is loaded and deformed is converted into a load value by the resistance transformer, the strain load is accurately measured, and then the strain pressure intensity can be calculated.

Description

Technical Field

[0001] The utility model relates to a uniaxial compression deformation experimental device for coal and rock mass, belonging to the technical field of experimental devices. Background Technique

[0002] In order to master the on-site geological conditions of gob-side entry driving in the isolated island working face of the test well, it is first necessary to conduct experimental analysis on the physical and mechanical properties of the intact coal and rock samples in the mine. The test results can provide a necessary basis for the establishment of a numerical model and at the same time provide a reference for the design of the on-site industrial test plan. In these tests, there will be compression deformation experiments on coal and rock mass. However, at present, when conducting the tests, there is no special test equipment, and it is carried out on a common press. The test failure load is measured by the pressure sensor of the press, which affects the accuracy of test detection. Content of the Utility Model

[0003] The utility model provides a uniaxial compression deformation experimental device for coal and rock mass, which solves the problem that when conducting tests at present, there is no special test equipment, and it is carried out on a common press. The test failure load is measured by the pressure sensor of the press, which affects the accuracy of test detection.

[0004] The utility model relates to a uniaxial compression deformation experimental device for coal and rock mass, including a bottom plate. A placement plate is fixed in the middle of the bottom plate. A pressure plate is arranged directly above the placement plate. A lifting oil cylinder is connected above the pressure plate. The lifting oil cylinder is fixed with a support plate. Four corners of the bottom of the support plate are fixed with support arm rods. The bottom of the support arm rods is fixed to the bottom plate. A coal and rock mass sample is placed between the pressure plate and the placement plate. Horizontal and vertical strain gauges are pasted on the coal and rock mass sample, and the strain gauges are connected to a resistance strain gauge.

[0005] As a preference, a connecting plate is fixed on the top of the pressure plate. The middle of the top of the connecting plate is fixed to the piston rod end of the lifting oil cylinder. Sliders are fixed on the outer side wall of the connecting plate. The sliders are connected with vertical slide rails, and the slide rails are fixed on the support arm rods. The pressure plate is more stable when applying pressure.

[0006] As a preference, positioning pins are fixed at the middle positions of the front, back, left and right sides of the placement plate. The distances from the multiple positioning pins to the central axis of the placement plate are equal. A transparent protective cover is positioned outside the positioning pins. An opening for the pressure plate to enter and exit is arranged at the top of the protective cover. The protective cover can block the fragments ejected by the coal and rock mass sample during pressure application. And the positioning pins can quickly install and position the protective cover and prevent the protective cover from moving during the test. The protective cover is a transparent and dense structure, which can facilitate observing the compression condition of the coal and rock mass sample.

[0007] As a preference, a slag discharge opening is provided on the bottom plate at the front side of the placement tray. A material receiving hopper is fixed at the bottom of the slag discharge opening. A slag discharge pipe is provided at the bottom of the material receiving hopper, and a slag receiving bucket is provided at the bottom of the slag discharge pipe. It is convenient to collect the crushed slag of the coal and rock mass sample after the test, which is convenient for subsequent use.

[0008] As a preference, a corrugated expansion pipe is fixed at the bottom of the slag discharge pipe, and the bottom of the corrugated expansion pipe is buckled on the outer side wall of the top inlet of the slag receiving bucket. This can prevent the crushed slag from falling when it is discharged.

[0009] The present utility model has the following beneficial effects:

[0010] It can specifically conduct the uniaxial compression deformation experiment of coal and rock mass. Through the change of the resistance in the strain gauge after the strain gauge is deformed under load, it is converted into a load value by a strain resistance gauge to accurately measure the strain load, and then the strain pressure can be calculated. Description of the Drawings

[0011] Figure 1 is a structural schematic diagram of the present utility model;

[0012] Figure 2 is a top structural schematic diagram of the bottom plate;

[0013] In the figure: 1, lifting oil cylinder; 2, support plate; 3, connecting plate; 4, slide rail; 5, slider; 6, support arm rod; 7, protective cover; 8, strain gauge; 9, positioning pin; 10, wire passing hole; 11, material receiving hopper; 12, slag receiving bucket; 13, corrugated expansion pipe; 14, bottom plate; 15, placement tray; 16, coal and rock mass sample; 17, pressing plate; 18, slag discharge opening. Specific Embodiments

[0014] The following further describes the present utility model in conjunction with embodiments.

[0015] Embodiment 1, as Figures 1 to 2 shown, the present utility model is an uniaxial compression deformation experiment device for coal and rock mass, including a bottom plate 14. A placement tray 15 is fixed in the middle of the bottom plate 14. A pressing plate 17 is provided directly above the placement tray 15. A lifting oil cylinder 1 is connected above the pressing plate 17. The lifting oil cylinder 1 is fixed with a support plate 2. Four corners of the bottom of the support plate 2 are fixed with support arm rods 6. The bottom of the support arm rods 6 is fixed to the bottom plate 14. A coal and rock mass sample 16 is placed between the pressing plate 17 and the placement tray 15. Transverse and longitudinal strain gauges 8 are pasted on the coal and rock mass sample 16, and the strain gauges 8 are connected to a strain resistance gauge.

[0016] Before the experiment, the original data of each coal and rock mass specimen 16 is measured first, such as the diameter of the coal and rock mass specimen 16. During the measurement, the strain gauge 8 is pasted on the coal and rock mass specimen 16, then the bottom of the coal and rock mass specimen 16 is placed on the placement plate 15, and then the lifting oil cylinder 1 extends, and the pressure plate 17 applies pressure to the coal and rock mass specimen 16. After the coal and rock mass specimen 16 is deformed under load, the resistance in the strain gauge 8 changes accordingly. The resistance strain gauge converts the change in the resistance value into a voltage signal and amplifies it, and finally displays a curve that changes proportionally to the load and the magnitude of the load data value. Then, by dividing the load by the cross-sectional area of the specimen of the coal and rock mass specimen 16 perpendicular to the loading direction, the uniaxial compressive strength of the coal and rock mass specimen 16 can be obtained.

[0017] Example 2, on the basis of Example 1, a connecting plate 3 is fixed to the top of the pressure plate 17. The middle of the top of the connecting plate 3 is fixed to the piston rod end of the lifting oil cylinder 1. A slider 5 is fixed to the outer side wall of the connecting plate 3. The slider 5 is connected to a vertical slide rail 4, and the slide rail 4 is fixed to the support arm rod 6.

[0018] Positioning pins 9 are fixed at the middle positions of the front, rear, left, and right sides of the placement plate 15. The distances of the multiple positioning pins 9 from the central axis of the placement plate 15 are equal. A transparent protective cover 7 is positioned outside the positioning pins 9. An opening for the pressure plate 17 to enter and exit is provided at the top of the protective cover 7.

[0019] A slag discharge port 18 is provided on the bottom plate 14 on the front side of the placement plate 15. A receiving hopper 11 is fixed to the bottom of the slag discharge port 18. A slag discharge pipe is provided at the bottom of the receiving hopper 11, and a slag receiving bucket 12 is provided at the bottom of the slag discharge pipe.

[0020] A corrugated expansion pipe 13 is fixed to the bottom of the slag discharge pipe. The bottom of the corrugated expansion pipe 13 is buckled on the outer side wall of the top inlet of the slag receiving bucket 12. A wire passing hole 10 for the power line to pass through is provided at the bottom of the front side of the protective cover 7.

[0021] Before the experiment, first place the slag receiving bucket 12 at the bottom of the slag discharge pipe, then stretch the corrugated expansion pipe 13 downward so that the bottom of the corrugated expansion pipe 13 is sleeved on the outside of the top inlet of the slag receiving bucket 12. After placing the coal and rock mass specimen 16 on the placement plate 15, a transparent protective cover 7 can be placed outside the positioning pins 9, and then the experiment is carried out. After the experiment is completed, after the lifting oil cylinder 1 contracts, remove the protective cover 7, then remove the strain gauge 8 from the coal and rock mass specimen 16, and then use a brush to sweep the residual debris on the bottom plate 14 into the slag discharge port 18, and then the debris enters the slag receiving bucket 12 through the receiving hopper 11 for centralized collection.

[0022] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0023] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

Claims

1. A coal rock mass uniaxial compression deformation test device, characterized in that: The invention comprises a bottom plate (14), a placing plate (15) is fixed in the middle of the bottom plate (14), a pressure plate (17) is arranged directly above the placing plate (15), a lifting cylinder (1) is connected above the pressure plate (17), a support plate (2) is fixed to the lifting cylinder (1), support arms (6) are fixed at the four corners of the bottom of the support plate (2), the bottom of the support arms (6) is fixed to the bottom plate (14), a coal rock sample (16) is placed between the pressure plate (17) and the placing plate (15), transverse and longitudinal strain gauges (8) are pasted on the coal rock sample (16), and the strain gauges (8) are connected to resistance strain gauges.

2. The uniaxial compression deformation test device for coal and rock mass according to claim 1 is characterized in that: A connecting plate (3) is fixed on the top of the pressure plate (17), the middle of the top of the connecting plate (3) is fixed to the piston rod end of the lifting cylinder (1), a sliding block (5) is fixed on the outer wall of the connecting plate (3), the sliding block (5) is connected to a vertical sliding rail (4), and the sliding rail (4) is fixed on the support arm rod (6).

3. The uniaxial compression deformation test device for coal and rock mass according to claim 2 is characterized in that: Positioning pins (9) are fixed at the middle positions of the front, back, left, and right sides of the placement plate (15), and the plurality of positioning pins (9) are equidistant from the central axis of the placement plate (15). A transparent protective cover (7) is positioned outside the positioning pins (9), and an opening for the pressure plate (17) to enter and exit is provided at the top of the protective cover (7).

4. The uniaxial compression deformation test device for coal and rock mass according to claim 1 is characterized in that: A slag discharge port (18) is provided on the bottom plate (14) at the front side of the placement plate (15), a receiving hopper (11) is fixed at the bottom of the slag discharge port (18), a slag discharge pipe is provided at the bottom of the receiving hopper (11), and a slag receiving bucket (12) is provided at the bottom of the slag discharge pipe.

5. The uniaxial compression deformation test device for coal and rock mass according to claim 1 is characterized in that: A corrugated telescopic pipe (13) is fixed at the bottom of the slag discharge pipe, and the bottom of the corrugated telescopic pipe (13) is buckled on the outer side wall of the top inlet of the slag receiving bucket (12).

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