A device and method for rapidly preparing multi-stage mixed proportion coal and rock standard test pieces

Abstract

The present invention discloses a device and method for rapidly preparing a multi-stage mixed proportion coal-rock standard specimen. For a broken surrounding rock tunnel, grouting reinforcement is an effective way to control the tunnel surrounding rock. In order to test the specific mechanical properties of the coal-rock mass after reinforcement with slurries of different solid-liquid ratios, the coal-rock mass and grouting materials are made into proportioned coal-rock standard specimens at a laboratory scale. The original preparation method of the proportioned standard specimens is single, the time efficiency has a wide span, the molding time and molding quality cannot be controlled artificially, and the size of the specimens cannot meet the specific requirements of the experimental parameter test to a large extent. The solid in the liquid will settle at the bottom of the model under the influence of gravity, resulting in the inhomogeneity of the specimens. The three solid-liquid material mixing modes in the present invention make the molded specimens more homogeneous, and the sealed heating and rotary circulation make the specimen molding faster. The present invention can effectively solve the problems of long time for manual stirring of slurry and long time for waiting for specimen molding, and improve the molding quality of standard specimens and simplify the preparation process of grouting proportion standard specimens. The rapid preparation device for proportioned coal and rock standard specimens in the present invention is mainly composed of two major parts: sealed heating and rotary mixing. The specific components are an integral configuration box, a three-way spiral feeding and mixing device, a clockwise rotating device, an impact vibration table, a sealable mold, a heating component, and the like.

Description

Technical Field

[0001] The present invention relates to a device and method for rapidly preparing a multi-stage mixed ratio coal rock standard test piece Technical Background

[0002] After years of exploration and development, my country has formed a complete set of tunnel support technology based on coal rock geomechanics testing and anchoring and grouting reinforcement as the core in coal mines. For broken surrounding rock tunnels, due to the low bonding force between anchoring agents and broken surrounding rocks, the mechanical properties of anchor rods and anchor cables cannot be fully utilized. Under this condition, grouting reinforcement is an effective way to control the surrounding rock of the tunnel. The purpose of grouting reinforcement is to improve the strength and integrity of the broken surrounding rock, improve its mechanical properties, improve the stability of the broken coal rock mass during the mining process, control the deformation and damage of the surrounding rock, and avoid and reduce roof collapse and slab accidents caused by broken surrounding rock. In order to test the specific mechanical properties of coal rock after grouting reinforcement with different solid-liquid ratios, the coal rock mass and grouting materials are made into mixed proportion coal rock standard specimens at the laboratory scale, and various mechanical parameters are tested on the standard specimen testing machine to make necessary preparations for the specific mechanical performance analysis.

[0003] The preparation of ordinary standard specimens will have the following problems: the preparation method is single, the time efficiency spans a wide range, the molding time and molding quality cannot be controlled manually, the specimens need to be further polished by machine after molding, and the size of the specimens to a large extent cannot meet the specific requirements of the experimental parameter test. Because the standard specimens are supported by molds, the solids in the liquid will settle to the bottom of the model under the influence of gravity, resulting in inhomogeneity of the specimens. Based on the solution to the above problems, a device and method for rapid preparation of multi-stage mixed proportion coal and rock standard specimens are invented. Summary of the invention

[0004] The present invention discloses a device and method for rapidly preparing multi-stage mixed proportion coal and rock standard test pieces, which will reduce the time of manually stirring slurry and waiting time for test piece forming, improve the homogeneity and forming quality of standard test pieces, and simplify the preparation process of proportioned standard test pieces.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the solid-liquid material mixing mode can be divided into primary mixing, secondary mixing and tertiary mixing modes. The three solid-liquid material mixing modes make the molded specimens more homogeneous, and the sealed heating and rotary circulation make the specimen molding faster. The grouting ratio standard specimen rapid preparation device is mainly composed of two major parts: sealed heating and rotary mixing. The specific components are an integral configuration box, a three-way spiral feeding and mixing device, a clockwise rotating device, an impact vibration table, a sealable mold, a circular fixed end, a sealing cover, a sealing cover sinking protrusion, a second sealing ring, a sealing buckle, and a heating component.

[0006] The thickness of the fixed end of the sealable mold is consistent with the thickness of the sunken raised part of the sealing cover. The surface of the circular fixed end has a sealing groove whose radius is consistent with the radius of the second sealing ring of the sealing cover. A C-shaped gripper is arranged on the lower surface of the circular fixed end to connect with the sealing buckle of the sealing cover to fix the whole.

[0007] The three-way spiral feeding and mixing device comprises a water inlet, an ash inlet and a reinforcement inlet to form a three-way pipe opening, and a spiral stirring mixer is installed inside the straight pipe and driven by a power device.

[0008] The rotating device is composed of a bottom platform, a vertical fixed rod, and a rotating power component, wherein the rotating power component is installed one on the bottom platform and one on the vertical fixed rod respectively. The speeds of the front-to-back clockwise rotation and the left-to-right clockwise rotation are each set at three levels. After the speeds of the front-to-back, left-to-right rotation are orthogonal, the optimal speed is selected for rotation to make the interior of the standard specimen reach a fully uniform state.

[0009] The impact vibration table is composed of a pneumatic impact head and an elastic repeated jumping device. The rotating device works for one cycle, triggering the pneumatic impact head twice, and the elastic repeated jumping device starts to work, and performs vibration operations in sequence.

[0010] The present invention discloses a device and method for quickly preparing a multi-stage mixed ratio coal and rock standard specimen, which has the following beneficial effects: the original preparation method of the grouting ratio standard specimen is single, the time efficiency spans a wide range, the molding time and molding quality cannot be controlled manually, the specimen needs to be further polished by a machine after molding, and the size of the specimen cannot meet the specific requirements of the experimental parameter test to a large extent. The standard specimen has the support of a mold, and the solid in the liquid will settle to the bottom of the model under the influence of gravity, resulting in the inhomogeneity of the specimen. The present invention can effectively solve the problems of long time for manual stirring of slurry and long time for waiting for specimen molding, and improves the molding quality of standard specimens and simplifies the preparation process of grouting ratio standard specimens.

[0011] Description of the attached figure

[0012] Figure 1 Schematic diagram of the overall cross-section of the device of the present invention.

[0013] Figure 2 It is a schematic diagram of the bottom rotating impact structure.

[0014] Figure 3 It is a schematic diagram of the structure of a three-way spiral feeding and mixing device.

[0015] Figure 1 , 2, 3. 1. Bottom angle stabilizer of the integral configuration box, 2. Moving parts of the heating device, 3. Heating part of the heating device, 4. Integral configuration box, 5. Rotating rod, 6. Suction cup sampling robot arm, 7. Three-way spiral feeding and mixing device, 7 (a). Water inlet, 7 (b). Ash inlet, 7 (c). Reinforcement port, 7 (d). Spiral stirring mixer, 8. Bottom platform of the rotating device, 9. Left and right rotating power parts, 10. Impact vibration table, 11. Air pressure impact head, 12. Elastic repeated jumping device, 13. Sealing mold, 14. Forward and backward rotating power parts, 15. Vertical fixing rod. DETAILED DESCRIPTION

[0016] Please refer to Figures 1 to 3 The present invention discloses a device and method for rapidly preparing a multi-stage mixed proportion coal rock standard specimen. The proportioning materials are added into a three-way spiral feeding and mixing device (7) from a ash adding port (7(b)) and a reinforcement port (7(c)) respectively. The spiral stirring mixer (7(d)) ​​is started and water is injected into a water adding port (7(a)) to make the materials perform a solid-liquid primary mixing mode. After a slurry material with a certain solid-liquid ratio is formed, the sealed mold (13) is opened and the slurry material is injected into the sealed mold (13). After that, the mold is sealed again to perform a secondary mixing of the materials. The secondary mixing rotating device is composed of a rotating device bottom platform (8), a vertical fixed rod (15), a left-right rotating power component (9) and a front-back rotating power component (14). The speed of the rotating device is manually graded and set, which is mainly determined by the solid-liquid ratio of the configured standard specimen. While the solid-liquid secondary mixing mode is being performed, the solid-liquid tertiary mixing mode is started. The impact vibration table (1 0) is installed under the bottom platform of the rotating device. When the rotating device works for one cycle, the air pressure impact head (11) is triggered twice. The impact head hits the bottom platform of the rotating device and then quickly recovers. The elastic repeated jumping device (12) starts to work, and the rotating impact vibration cycle operation is carried out in sequence. The temperature of the heating part (3) of the heating device and the front and rear positions of the moving parts (2) of the heating device are adjusted according to the solid-liquid ratio. The working mode of the grouting ratio standard test piece rapid preparation device is a segmented cycle mode. The time interval between the segmented cycles is mainly determined by the pressure display gauge installed on the top of the sealing cover. When the pressure gauge reaches the set value, the preparation device stops working, and then the sealing mold (13) is quickly opened to release the water vapor generated by the temperature increase, and then it is quickly re-sealed. The preparation device starts to enter the next cycle. When the test piece is made, the suction cup sampling mechanical arm (6) on the rotating rod (5) takes the sample, and the mechanical parameters of the taken standard test piece can be measured.

Claims

1. A multi-stage mixed proportion coal rock standard specimen rapid preparation device, characterized by: It consists of two major parts: sealing and heating, and rotating mixing. The specific components are an integral configuration box, a three-way spiral feeding and mixing device, a suction cup sampling mechanical arm, a clockwise rotating device, an impact vibration table, a sealable mold, a circular fixed end, a sealing cover, a sealing cover sinking convex part, a second sealing ring, a sealing buckle, and a heating component. The solid-liquid material mixing mode is divided into a primary mixing mode, a secondary mixing mode, and a tertiary mixing mode; The size of the sealable mold is determined by the specific size of the standard test piece. The shape of the mold is a semi-hollow cylinder, and a circular fixed end is set at the opening. The semi-hollow cylinder and the circular fixed end are connected as a whole, but do not affect the internal structure of the mold. The thickness of the circular fixed end is consistent with the thickness of the pressing convex part of the sealing cover. There is a circle of sealing grooves on the surface of the circular fixed end, and the radius of the sealing groove is consistent with the radius of the second sealing ring on the lower surface of the sealing cover. A C-shaped gripper is set on the lower surface of the circular fixed end to connect with the sealing buckle of the sealing cover to fix the whole. The solid-liquid primary mixing mode is a three-way spiral feeding and mixing device, which consists of a water inlet, an ash inlet and a reinforcement inlet to form a three-way pipe port. A spiral stirring mixer is installed inside the straight pipe and driven by a power device. The two materials are added into the straight pipe from the ash inlet and the reinforcement inlet, and the spiral stirrer is started. After working for a period of time, water is added from the water inlet. After a certain solid-liquid ratio of the proportioned material is formed, the stirrer is stopped, and then the proportioned material is injected into the standard specimen model for secondary mixing of the material; The solid-liquid two-stage mixing mode is a rotation mode. The rotating device of the rotation mode rotates clockwise forward and backward and clockwise left and right. The rotating device is composed of a bottom platform, a vertical fixed rod, and a rotating power component, wherein one rotating power component is installed on the bottom platform and one on the vertical fixed rod. The speed of the rotating device is manually graded and set, which is mainly determined by the solid-liquid ratio of the configured standard specimen. The speed of the clockwise rotation forward and backward and the clockwise rotation left and right are each set at three levels. After the speeds of the front, back, left and right rotations are orthogonal, the optimal speed is selected to rotate so that the inside of the standard specimen reaches a fully uniform state. The solid-liquid three-stage mixing mode is an impact vibration mode. The impact vibration table is installed under the bottom platform of the rotating device. It is composed of a pneumatic impact head and an elastic repeated jumping device. In order to fully mix the various substances inside the mold, the impact vibration table cooperates with the rotating device. The rotating device works in one cycle, triggering the pneumatic impact head twice. The impact head hits the bottom platform of the rotating device and then quickly recovers. The elastic repeated jumping device starts to work and performs vibration operations in sequence.

2. The multi-stage mixed proportion coal rock standard specimen rapid preparation device according to claim 1 is characterized in that: The heating device consists of a heating part and a moving part. The four groups of heating devices inside the box are distributed on the four sides of the box. The distance between the heating device and the mold is adjusted front and back according to the solid-liquid ratio. The specific temperature of the heating device is adjusted according to the solid-liquid ratio.

3. The multi-stage mixed proportion coal rock standard specimen rapid preparation device according to claim 1 is characterized in that: The working mode of the preparation device is a segmented cycle mode. The time interval between segmented cycles is mainly determined by the pressure display gauge installed on the top of the sealing cover. When the pressure gauge reaches the set value, the preparation device stops working. After that, the sealable mold is quickly opened to release the water vapor generated by the increase in temperature, and then it is quickly resealed and the preparation device starts to enter the next cycle.

4. The multi-stage mixed proportion coal rock standard specimen rapid preparation device according to claim 1 is characterized in that: The three-way spiral feeding and mixing device and the suction cup sampling mechanical arm are installed on the symmetrical sides of the same rotating rod. The rotating rod has three working modes, namely feeding, sampling and stop mode. When feeding, the three-way spiral feeding and mixing device on the rotating rod is aligned with the mold, and when sampling, the suction cup sampling mechanical arm on the rotating rod is aligned with the mold.

5. The device for rapidly preparing a multi-stage mixed ratio coal rock standard specimen according to claim 1, characterized in that: Bottom corner stabilizers are set at the four corners of the overall configuration box to maintain the center of gravity of the overall preparation device.

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