Slurry compaction performance testing device

Abstract

The utility model discloses a slurry compaction performance testing device, and belongs to the field of gangue fluidization filling. The cylinder body is fixed with the base and the upper sealing cover through bolts, a filter screen, screen cloth and a screen plate are arranged at the bottom of the cylinder body, and a film sensor is arranged on the inner wall of the cylinder body and connected with a static strain gauge through a data line; the water chute is located on the base and connected to the water pipe and the drainage valve; an axial pressure inlet is positioned in the upper sealing cover and is connected with the constant-speed constant-pressure pump through a water pipe; a sealing rubber ring is arranged on the lower portion of the load transfer piston, and a cavity is formed in the load transfer piston and communicated with the pressure relief opening. During working, the constant-speed and constant-pressure pump is used for loading and stabilizing axial pressure, the film sensor, the displacement sensor and the pressure sensor can record the axial pressure, pressure measurement and strain in a slurry compaction state, and the compaction performance of fluidized slurry is tested. The device is simple in structure, has important practical significance on proportioning optimization of slurry, and plays an important role in promoting development of a gangue fluidization grouting filling technology.

Description

Technical Field

[0001] The utility model relates to a slurry compaction performance testing device, belonging to the field of gangue fluidization filling. Background Art

[0002] The coal mining process inevitably destroys the original stress environment of the mining site, causing the overburden to bend, sink and break, and further leads to environmental problems such as water resource loss, surface subsidence, and damage to buildings. In addition, coal mining also produces a large amount of gangue. If these gangues are piled up on the surface, they will not only occupy a large amount of land resources, but also cause environmental and safety problems such as water resource pollution, air pollution, and gangue spontaneous combustion. With the introduction of multiple laws and policies by the state and local governments to restrict the accumulation of gangue on the ground and encourage the disposal and utilization of gangue, how to efficiently dispose of large amounts of gangue solid waste while protecting the ecological environment is a problem that most mining areas in my country urgently need to solve.

[0003] The prior art with publication number CN103792159A discloses a method for testing the bleeding rate and shrinkage rate of filling slurry, which is to put the prepared filling slurry into a closed container, test its mass and volume, let it stand, wait for it to finally set to form a filling body entity, then measure the volume and mass of the formed filling body entity and the exuded water on the upper part, and obtain the parameters of the bleeding rate and shrinkage rate of the filling slurry by calculation. The bleeding rate and shrinkage rate of the filling slurry can be accurately tested; however, its structure is complex and it cannot test the changes of the slurry under a large load.

[0004] Gangue fluidized filling is to crush the gangue to a certain particle size, add water to make fluidized gangue slurry, and use filling pumps, pipelines and other equipment to transport it through grouting boreholes to the collapse zone, fracture zone, and separation zone formed after coal seam mining for filling, so as to achieve the dual goals of environmental protection and efficient underground disposal of gangue. Among them, slurry is one of the key factors affecting the effect of grouting filling. The compaction performance of slurry will significantly affect the control effect of the filling body on the overburden, and then affect the filling environmental protection effect. In order to ensure the filling effect, it is necessary to test the slurry performance and optimize the slurry ratio. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a slurry compaction performance testing device, which provides guidance for the optimization design of slurry ratio in fluidized grouting filling of coal mine gangue through laboratory testing.

[0006] In order to achieve the above technical purpose, the utility model discloses a slurry compaction performance test device, the cylinder body is a vertically arranged cylindrical structure, and flanges are respectively provided at the upper and lower ends, the top end of the cylinder body is connected to an upper sealing cover through the flange, the upper sealing cover is provided with an axial pressure inlet, the axial pressure inlet is connected to a loading system through a water guide pipe b, the bottom end of the cylinder body is connected to a base through a flange, a load transfer piston that can move up and down is provided in the cylinder body, and the piston rod of the load transfer piston extends from the upper sealing cover, thereby dividing the space in the cylinder body into a rod chamber above the load transfer piston and a rodless chamber below the load transfer piston;

[0007] The rod cavity is filled with water supplied by the loading system, and the rodless cavity is provided with the slurry to be measured, wherein a cavity is axially provided in the piston rod of the carrier piston, the cavity is provided with a pressure relief port, a displacement sensor is connected to the pressure relief port, a thin film sensor is provided between the slurry and the inner wall of the cylinder body of the rodless cavity, the thin film sensor is connected to the static strain gauge through a data line, and a protective thin layer is provided between the inner wall of the cylinder body of the rodless cavity of the thin film sensor, a water guide groove is provided in the base, and a filter plate is provided on the contact surface between the upper top surface of the base and the slurry;

[0008] A sealing rubber ring a is arranged on the side wall of the transfer piston to ensure sealing with the inner wall of the cylinder body, a sealing rubber ring b is arranged between the cylinder body and the upper sealing cover, a sealing rubber ring c is arranged between the cylinder body and the base, and a drain valve is arranged on the water guide pipe a.

[0009] Furthermore, the filter plate includes two layers of stainless steel filter screens, five layers of screen cloth are arranged between the upper and lower layers of stainless steel filter screens, and a stainless steel screen plate is arranged on the upper stainless steel filter screen, wherein the stainless steel filter screen, the stainless steel screen plate and the screen cloth are matched in size with the inner diameter of the cylinder body, thereby preventing aggregate particles in the tested slurry from flowing out through the water guide groove or clogging the water guide groove.

[0010] Furthermore, the loading system includes a constant speed and constant pressure pump and a water bucket, which are connected to the axial pressure inlet through a water pipe b, wherein a discharge valve and a suction valve for controlling the water flow direction are respectively provided on the water pipe b at the constant speed and constant pressure pump and the water bucket.

[0011] Furthermore, the inner diameter of the cylinder is mm, the height is mm, the wall thickness is mm, the thickness of the load-carrying piston is mm, and the height of the thin film sensor and the protective thin layer in the cylinder is mm.

[0012] Furthermore, the film sensor model is a flexible film pressure sensor of FSR, the displacement sensor signal is KFM-mm, and the pressure sensor is a diffused silicon piezoresistive pressure sensor of TYCO-X.

[0013] Furthermore, the pore size of the stainless steel filter is .mm~mm, the pore size of the middle screen cloth is μm~μm, the stainless steel sieve plate is mm thick, the pore diameter is mm, and the spacing is mm. Beneficial Effects

[0014] 1. The test equipment and method can better simulate the whole process of gangue slurry being compressed, seeping, consolidating and bearing in the post-mining space, and can test the lateral pressure under compression. The test equipment of the utility model has a simple and reliable structure, is easy to maintain, and has a simple and feasible operation process.

[0015] 2. The test equipment and test method of the utility model can change the loading stress size and loading mode according to the actual conditions of different coal mines. It is suitable for compaction performance testing of various fluidized slurries and is not limited to gangue slurry. It has a high promotion and application value in the field of fluidized slurry performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a slurry compaction performance testing device in an embodiment of the utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of a cylinder of a slurry compaction performance testing device in an embodiment of the utility model;

[0018] Figure 3 This is a curve diagram showing the variation of lateral stress of slurry with axial stress in the embodiment of the utility model;

[0019] Figure 4 This is a graph showing the slurry compaction stress-strain curve in an embodiment of the present utility model.

[0020] In the figure: 1—slurry; 2—cylinder body; 3—bolt; 4—base; 5—static strain gauge; 6—computer; 7—water pipe a; 8—drain valve; 9—water guide groove; 10—sealing rubber ring c, 11—filter plate; 12—protective thin layer; 13—film sensor; 14—sealing rubber ring a; 15—carrying piston; 16—water; 17—axial pressure inlet; 18—pressure relief port; 19—displacement sensor; 20—pressure sensor; 21—water pipe b; 22—liquid discharge valve; 23—liquid suction valve; 24—constant speed and constant pressure pump; 25—upper sealing cover; 26—sealing rubber ring c; 27—water bucket. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings.

[0022] like Figure 1As shown, a slurry compaction performance test device of the utility model, the cylinder body 2 is a vertically arranged cylindrical structure, and flanges are provided at the upper and lower ends respectively, the top of the cylinder body 2 is connected to an upper sealing cover 25 through a flange, the upper sealing cover 25 is provided with an axial pressure inlet 17, the axial pressure inlet 17 is connected to a loading system through a water pipe b21, the loading system includes a constant speed constant pressure pump 24 and a water bucket 27, the constant speed constant pressure pump 24 and the water bucket 27 are connected to the axial pressure inlet 17 through the water pipe b21, wherein the water pipe b21 is provided with a discharge valve 22 and a suction valve 23 for controlling the water flow direction at the constant speed constant pressure pump 24 and the water bucket 27. The bottom end of the cylinder body 2 is connected to a base 4 through a flange, a transfer piston 15 that can move up and down is provided in the cylinder body 2, and the piston rod of the transfer piston 15 extends from the upper sealing cover 25, thereby dividing the space in the cylinder body 2 into a rod chamber above the transfer piston 15 and a rodless chamber below the transfer piston 15;

[0023] The rod cavity is filled with water 16 supplied by the loading system, and the rodless cavity is provided with the slurry 1 to be tested, wherein a cavity is axially provided in the piston rod of the carrier piston 15, and the cavity is provided with a pressure relief port 18, and the pressure relief port 18 is connected to a displacement sensor 19, and a thin film sensor 13 is provided between the slurry 1 and the inner wall of the cylinder body of the rodless cavity, and the thin film sensor 13 is connected to the static strain gauge 5 through a data line, and a protective thin layer 12 is provided between the inner wall of the cylinder body of the rodless cavity of the thin film sensor 13, a water guide groove 9 is provided in the base 4, and a filter plate 11 is provided on the upper top surface of the base 4 and the contact surface of the slurry 1; the filter plate 11 includes two layers of stainless steel filter mesh, five layers of screen cloth are provided between the upper and lower layers of stainless steel filter mesh, and a stainless steel screen plate is provided on the upper stainless steel filter mesh, wherein the stainless steel filter mesh, the stainless steel screen plate and the screen cloth match the inner diameter of the cylinder body 2, so as to prevent aggregate particles in the tested slurry 1 from flowing out through the water guide groove 9 or blocking the water guide groove 9. The pore size of the stainless steel filter is 0.1mm~1mm, the pore size of the middle screen cloth is 18μm~25μm, the stainless steel screen plate is 2mm thick, the pore diameter is 2mm, and the spacing is 2mm. Figure 2 shown.

[0024] A sealing rubber ring a14 is provided on the side wall of the transfer piston 15 to ensure sealing with the inner wall of the cylinder body 2, a sealing rubber ring b26 is provided between the cylinder body 2 and the upper sealing cover 25, a sealing rubber ring c10 is provided between the cylinder body 2 and the base 4, and a drain valve 8 is provided on the water pipe a7.

[0025] The inner diameter of the cylinder 2 is 150 mm, the height is 300 mm, the wall thickness is 20 mm, the thickness of the carrier piston 15 is 50 mm, and the height of the film sensor 13 and the protective thin layer 12 in the cylinder 2 is 250 mm. The film sensor 13 is a flexible film pressure sensor of FSR402, the displacement sensor 19 signal is KFM-250mm, and the pressure sensor 20 is a diffused silicon piezoresistive pressure sensor of TYCO-3X.

[0026] Workflow, taking the fluidized grouting filling of gangue in a coal mine as an example, the filling slurry is pure gangue slurry with a concentration of 65%, and the gangue particle size is 0~5mm. The compaction performance of the gangue slurry is tested using the above device. The specific steps are as follows:

[0027] S1, install the cylinder body 2 and the base 4, fix the cylinder body 2 and the base 4 with bolts 3, and use a sealing rubber ring 12 to ensure the sealing;

[0028] S2. After installing the filter screen, screen cloth and screen plate 13, pour 4.5 kg of slurry into the cylinder 2, install the transfer rod 19, transfer piston 15 and upper sealing cover 25, and use the sealing rubber ring 26 to ensure its sealing;

[0029] S3, connecting the output end of the thin film sensor 13 to the input end of the static strain gauge 5 through a wire, and the static strain gauge 5 is connected to the computer 6;

[0030] S4. Connect the constant speed and constant pressure pump 24 to the water bucket 27 and the axial pressure inlet 17 through the water pipe b21, open the suction valve 23, suck water into the constant speed and constant pressure pump 24, set the stable pressure of the constant speed and constant pressure pump 24 to 12MPa, open the discharge valve 24, and discharge the water into the cylinder 2 through the axial pressure inlet 17. When the water is emptied, repeat the suction and discharge steps until the pressure reaches 12MPa. At the same time, record the axial force, the lateral pressure and the displacement. The curve of the lateral stress of the slurry changing with the axial stress is shown in the figure. Figure 3 As shown in the figure, the stress-strain relationship of the slurry is as follows: Figure 4 As shown;

[0031] S5. During the loading process, the water valve 8 needs to be opened, and a beaker is used to collect the water seeping out from the water pipe during the slurry compaction process. After completion, the mass of the seeping water is weighed with an electronic scale, and the final mass of the seeping water is measured to be 0.44 kg.

Claims

1. A slurry compaction performance testing device, characterized in that: The cylinder body (2) is a vertically arranged cylindrical structure and is provided with flanges at both ends. The top end of the cylinder body (2) is connected to an upper sealing cover (25) via a flange. The upper sealing cover (25) is provided with an axial pressure inlet (17). The axial pressure inlet (17) is connected to a loading system via a water pipe b (21). The bottom end of the cylinder body (2) is connected to a base (4) via a flange. A load transfer piston (15) capable of moving up and down is provided in the cylinder body (2). The piston rod of the load transfer piston (15) extends from the upper sealing cover (25), thereby dividing the space in the cylinder body (2) into a rod chamber above the load transfer piston (15) and a rodless chamber below the load transfer piston (15). The rod cavity is filled with water (16) supplied by the loading system, and the rodless cavity is provided with a slurry (1) to be measured, wherein a cavity is axially provided in the piston rod of the carrier piston (15), the cavity is provided with a pressure relief port (18), and the pressure relief port (18) is connected to a displacement sensor (19), a thin film sensor (13) is provided between the slurry (1) and the inner wall of the cylinder body of the rodless cavity, the thin film sensor (13) is connected to the static strain gauge (5) via a data line, and a protective thin layer (12) is provided between the thin film sensor (13) and the inner wall of the cylinder body of the rodless cavity, a water guide groove (9) is provided in the base (4), and a filter plate (11) is provided on the contact surface between the upper top surface of the base (4) and the slurry (1); A sealing rubber ring a (14) is provided on the side wall of the transfer piston (15) to ensure sealing with the inner wall of the cylinder body (2), a sealing rubber ring b (26) is provided between the cylinder body (2) and the upper sealing cover (25), a sealing rubber ring c (10) is provided between the cylinder body (2) and the base (4), and a drain valve (8) is provided on the water guide pipe a (7).

2. The slurry compaction performance testing device according to claim 1, characterized in that: The filter plate (11) comprises an upper and lower layer of stainless steel filter screens, five layers of screen cloth are arranged between the upper and lower layers of the stainless steel filter screens, and a stainless steel screen plate is arranged on the upper layer of the stainless steel filter screen, wherein the stainless steel filter screen, the stainless steel screen plate, and the screen cloth are matched in size with the inner diameter of the cylinder body (2), thereby preventing aggregate particles in the tested slurry (1) from flowing out through the water guide groove (9) or clogging the water guide groove (9).

3. The slurry compaction performance testing device according to claim 1, characterized in that: The loading system comprises a constant speed constant pressure pump (24) and a water bucket (27), wherein the constant speed constant pressure pump (24) and the water bucket (27) are connected to the axial pressure inlet (17) via a water pipe b (21), wherein a discharge valve (22) and a suction valve (23) for controlling the water flow direction are respectively provided on the water pipe b (21) at the constant speed constant pressure pump (24) and the water bucket (27).

4. The slurry compaction performance testing device according to claim 1, characterized in that: The cylinder body (2) has an inner diameter of 150 mm, a height of 300 mm, and a wall thickness of 20 mm. The thickness of the carrier piston (15) is 50 mm. The height of the thin film sensor (13) and the protective thin layer (12) in the cylinder body (2) is 250 mm.

5. The slurry compaction performance testing device according to claim 1, characterized in that: The film sensor (13) is a flexible film pressure sensor of model FSR402, the displacement sensor (19) signal is KFM-250mm, and the pressure sensor (20) is a diffused silicon piezoresistive pressure sensor of model TYCO-3X.

6. The slurry compaction performance testing device according to claim 1, characterized in that: The pore size of the stainless steel filter is 0.1mm~1mm, the pore size of the middle screen cloth is 18μm~25μm, the stainless steel screen plate is 2mm thick, the pore diameter is 2mm, and the spacing is 2mm.

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