Device of rock hardness tester for different rock stratums in coal mine tunnel roof drilling

Abstract

The utility model relates to a device of a hardness tester for different rock strata in a coal mine tunnel roof drill hole, which comprises a spiral hand-cranking plunger rod, a spiral hand-cranking high-pressure oil cylinder, a hydraulic oil cavity, a one-way valve, a high-pressure oil pipe, a hardness display pressure gauge, an exhaust unloading valve, an oil inlet joint, a fracturing head, an alloy fracturing probe, a probe front sealing ring, a compression spring, a probe rear sealing ring and a fastening screw, the device comprises a hydraulic oil cylinder, a vertical oil inlet hole, a transverse oil inlet hole plug wire, a transverse oil inlet hole, a vertical oil inlet hole plug wire, a fracturing probe pushing rod, a depth display oil cylinder, a high-pressure compensation spring, a depth display graduated scale, a reversing valve, an oil return pipe and a supplementary oil tank. The components jointly form the device of the rock hardness tester for different rock stratums in the coal mine tunnel roof drill hole.

Description

Technical Field

[0001] The utility model relates to a device for testing the hardness of rocks of different rock layers, in particular to a method for manufacturing an instrument capable of testing the hardness of rocks in a top plate drill hole of an underground coal mine tunnel. Background Art

[0002] At present, most of the tests on the rock hardness of different rock layers on the roof of the tunnel in coal mines are done by drilling a hole more than 20 meters high on the roof, then taking out the stone cores from the hole, storing them in sections, and then taking them to the ground for sectioned hardness testing. This requires not only extracting the stone cores in sections from the borehole, but also taking them to the ground to test the hardness again with instruments. This takes several days and poses a hidden danger to the safe production in the coal mines. However, a device that does not require extracting the stone cores from the borehole and taking them to the ground for testing, but can directly test the hardness of different rock layers in the borehole to solve this problem has not yet been found. Summary of the Invention

[0003] The utility model is to solve the problem that "at present, in order to test the rock hardness of different rock layers of the roadway roof in coal mines, most of them are to drill a hole more than 20 meters high on the roof, then take out the stone core in the hole, store it in sections, and then take it to the ground for section hardness testing. In this way, firstly, the stone core needs to be extracted in sections in the borehole, and secondly, the hardness needs to be tested again on the ground with instruments, which takes several days and brings hidden dangers to the safe production in the coal mines; however, there has not been found a device to solve this problem by directly testing the hardness of different rock layers in the borehole instead of extracting the stone core in the borehole and taking it to the ground for testing". A device of a rock hardness tester for different rock layers in the borehole of the roadway roof of coal mines is proposed.

[0004] The utility model is realized through the following technical solutions:

[0005] A device for testing the hardness of different rock formations in a coal mine tunnel roof borehole, comprising a spiral hand-cranked plunger rod 1, a spiral hand-cranked high-pressure oil cylinder 2, a hydraulic oil chamber 3, a one-way valve 4, a high-pressure oil pipe 5, a hardness display pressure gauge 6, an exhaust unloading valve 7, an oil inlet joint 8, a fracturing probe 9, an alloy fracturing probe 10, a probe front sealing ring 11, a compression spring 12, a probe rear sealing ring 13, a set wire 14, a hydraulic oil cylinder 15, a vertical oil inlet hole 16, a horizontal oil inlet hole blocking wire 17, a horizontal oil inlet hole 18, a vertical inlet Oil hole plugging wire 19, fracturing probe propulsion rod 20, depth display cylinder 21, high-pressure compensation spring 22, depth display scale 23, reversing valve 24, oil return pipe 25, replenishing oil tank 26; It is characterized in that the spiral hand-cranked plunger rod 1 is installed at the lower end of the spiral hand-cranked high-pressure oil cylinder 2, a hydraulic oil chamber 3 is made in the spiral hand-cranked high-pressure oil cylinder 2, and a one-way valve 4 is installed between the high-pressure oil pipe 5 and the spiral hand-cranked high-pressure oil cylinder 2; the hardness display pressure gauge 6 and the exhaust unloading valve 7 are installed on the upper side of the high-pressure oil pipe 5 , the high-pressure oil pipe 5 passes through the fracturing probe propulsion rod 20 and is connected to the oil inlet joint 8. The fracturing probe propulsion rod 20 is fixed on the oil inlet joint 8, and the oil inlet joint 8 is tightened on the fracturing probe 9; the front sealing ring 11 of the probe, the compression spring 12, and the rear sealing ring 13 of the probe are sequentially sleeved on the outside of the alloy fracturing probe 10. The alloy fracturing probe 10 is installed in the hydraulic cylinder 15 and fixed with a set wire 14; the fracturing probe 9 is respectively opened with a vertical oil inlet hole 16 and a horizontal oil inlet hole 18, and a vertical oil inlet hole blocking wire 19 is installed In the vertical oil inlet hole 16, the horizontal oil inlet hole plugging wire 17 is installed in the horizontal oil inlet hole 18; the high-pressure compensation spring 22 is installed on the depth display scale 23, the depth display scale 23 is installed in the depth display cylinder 21, and the depth display cylinder 21 is installed on the high-pressure oil pipe 5; the two ends of the return oil pipe 25 are respectively connected to the reversing valve 24 and the supplementary oil tank 26, and the reversing valve 24 is installed on the spiral hand-cranked high-pressure oil cylinder 2, forming a device for testing the hardness of different rock formations in the roof drilling of coal mine tunnels.

[0006] In order to further achieve the purpose of convenient control operation, the spiral hand-cranked high-pressure oil cylinder 2 is installed with a spiral hand-cranked plunger rod 1, making the hydraulic system pressure boost more convenient.

[0007] The utility model has the following advantages over the existing hardness tester:

[0008] 1. With high-pressure bearing performance: it can work normally when the pressure is 60MPa.

[0009] 2. It has the function of fracturing depth testing: the high-pressure oil pipe 5 is equipped with a depth display cylinder 21 , and the depth detection value of the alloy fracturing probe 10 can be read through the depth display scale 23 .

[0010] 3. It has the function of detecting the hardness of different rock layers in the borehole: the fracturing probe 9 is equipped with a fracturing probe push rod 20 to detect rocks of different heights and layers; the high-pressure oil pipe 5 is equipped with a hardness display pressure gauge 6 to directly observe the rock hardness value.

[0011] 4. The structure is simple, the whole rock hardness tester for different rock layers in the coal mine tunnel roof drilling is small in size, light in weight, complete in specifications and models, easy to install, and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a structural diagram of a rock hardness tester for different rock layers in a coal mine tunnel roof borehole;

[0014] In the picture:

[0015] Spiral hand-cranked plunger rod 1, spiral hand-cranked high-pressure cylinder 2, hydraulic oil chamber 3, one-way valve 4, high-pressure oil pipe 5, hardness display pressure gauge 6, exhaust unloading valve 7, oil inlet joint 8, fracturing probe 9, alloy fracturing probe 10, probe front sealing ring 11, compression spring 12, probe rear sealing ring 13, set wire 14, hydraulic cylinder 15, vertical oil inlet hole 16, horizontal oil inlet hole blocking wire 17, horizontal oil inlet hole 18, vertical oil inlet hole blocking wire 19, fracturing probe push rod 20, depth display cylinder 21, high-pressure compensation spring 22, depth display scale 23, reversing valve 24, oil return pipe 25, and refueling tank 26. DETAILED DESCRIPTION

[0016] A device for testing the hardness of different rock formations in a coal mine tunnel roof borehole, comprising a spiral hand-cranked plunger rod 1, a spiral hand-cranked high-pressure oil cylinder 2, a hydraulic oil chamber 3, a one-way valve 4, a high-pressure oil pipe 5, a hardness display pressure gauge 6, an exhaust unloading valve 7, an oil inlet joint 8, a fracturing probe 9, an alloy fracturing probe 10, a probe front sealing ring 11, a compression spring 12, a probe rear sealing ring 13, a set wire 14, a hydraulic oil cylinder 15, a vertical oil inlet hole 16, a horizontal oil inlet hole blocking wire 17, a horizontal oil inlet hole 18, a vertical Straight oil hole plug wire 19, fracturing probe propulsion rod 20, depth display cylinder 21, high-pressure compensation spring 22, depth display scale 23, reversing valve 24, return oil pipe 25, replenishing oil tank 26; It is characterized in that the spiral hand-cranked plunger rod 1 is installed at the lower end of the spiral hand-cranked high-pressure oil cylinder 2, a hydraulic oil chamber 3 is made in the spiral hand-cranked high-pressure oil cylinder 2, and a one-way valve 4 is installed between the high-pressure oil pipe 5 and the spiral hand-cranked high-pressure oil cylinder 2; the hardness display pressure gauge 6 and the exhaust unloading valve 7 are installed on the high-pressure oil pipe 5, the high-pressure oil pipe 5 passes through the fracturing probe propulsion rod 20 and is connected to the oil inlet joint 8, the fracturing probe propulsion rod 20 is fixed on the oil inlet joint 8, and the oil inlet joint 8 is tightened on the fracturing probe 9; the front sealing ring 11 of the probe, the compression spring 12, and the rear sealing ring 13 of the probe are sequentially sleeved on the outside of the alloy fracturing probe 10, the alloy fracturing probe 10 is installed in the hydraulic cylinder 15 and fixed with a set wire 14; the fracturing probe 9 is respectively opened with a vertical oil inlet hole 16, a horizontal oil inlet hole 18, and a vertical oil inlet hole The blocking wire 19 is installed in the vertical oil inlet hole 16, and the horizontal oil inlet hole blocking wire 17 is installed in the horizontal oil inlet hole 18; the high-pressure compensation spring 22 is installed on it, the depth display scale 23 is installed in the depth display cylinder 21, and the depth display cylinder 21 is installed on the high-pressure oil pipe 5; the two ends of the return oil pipe 25 are respectively connected to the reversing valve 24 and the supplementary oil tank 26, and the reversing valve 24 is installed on the spiral hand-cranked high-pressure oil cylinder 2, forming a device for testing the hardness of different rock formations in the roof drilling of coal mine tunnels.

[0017] During operation, hold the spiral hand-cranked high-pressure oil cylinder 2 with your left hand and shake the spiral hand-cranked plunger rod 1 with your right hand. The hydraulic oil flows from the hydraulic oil chamber 3 through the one-way valve 4, the high-pressure oil pipe 5, and the oil inlet joint 8 into the fracturing probe 9, and then enters the hydraulic cylinder 15 through the horizontal oil inlet hole 18 and the vertical oil inlet hole 16. The hydraulic oil applies pressure to the alloy fracturing probe 10. Keep shaking the spiral hand-cranked plunger rod 1. The pressure of the hydraulic oil in the hydraulic cylinder 15 increases, and the pressure on the alloy fracturing probe 10 increases, which increases the thrust on the rock in the borehole until the rock in the borehole is crushed. When the pressure of the hardness display pressure gauge 6 drops suddenly, stop shaking the spiral hand-cranked plunger rod 1 immediately, observe and count the instantaneous value of the hardness display pressure gauge 6 before the pressure drops suddenly, that is, the rock hardness value, and observe and count the expansion and contraction value of the depth display scale 23 after the hardness display pressure gauge 6 drops suddenly, that is, the fracturing depth value of the alloy fracturing probe 10; the exhaust unloading valve 7 evacuates the air in the high-pressure oil pipe 5 before pressurization, and the one-way valve 4 prevents the hydraulic oil from flowing back during the pressurization process; the front sealing ring 11 and the rear sealing ring 13 of the probe play a sealing role in the alloy fracturing probe 10, and the pressure The compression spring 12 plays a role in returning the alloy fracturing probe 10; the set wire 14, the horizontal oil inlet hole blocking wire 17, and the vertical oil inlet hole blocking wire 19 respectively block the hydraulic oil in the hydraulic cylinder 15, the vertical oil inlet hole 16, and the horizontal oil inlet hole 18; the depth display cylinder 21 has the same cylinder diameter as the hydraulic cylinder 15. When the rock suddenly breaks and the alloy fracturing probe 10 quickly extends into the rock, the pressure in the high-pressure oil pipe 5 drops, and the pressure in the depth display cylinder 21 also drops immediately. The depth display scale 23 moves under the action of the high-pressure compensation spring 22. The moving value is the fracturing depth value of the alloy fracturing probe 10; when the work stops, the reversing valve 24 is opened, and the hydraulic oil in the high-pressure oil pipe 5 flows back to the replenishing oil tank 26 through the return oil pipe 25. There is no pressure in the high-pressure oil pipe 5, and the alloy fracturing probe 10 is retracted into the fracturing probe 9 under the action of the compression spring 12; the probe pushing rod 20 is pushed upward or stretched downward in the borehole, and pressure is applied to the alloy fracturing probe 10 again, which can test the rock hardness of different rock formations, thereby achieving the purpose of realizing a device for a rock hardness tester for different rock formations in a coal mine roadway roof borehole.

[0018] When stopping work, stop shaking the hand-cranked plunger rod 1, open the reversing valve 24, retract the fracturing probe push rod 20, withdraw the fracturing probe 9, and place it in a dry place to air dry to prevent rust and ensure long-term normal use.

[0019] Practice has proved that the rock hardness tester for different rock layers in the coal mine roadway roof drilling made according to the above scheme can

[0020] The maximum bearing pressure range is 60MPa, 70MPa, 80MPa, and 90MPa; the rock hardness values ​​tested for different rock formations are between F6, F7, F8, and F9.

Claims

1. A device for testing the hardness of different rock formations in a coal mine tunnel roof borehole, comprising a spiral hand-cranked plunger rod (1), a spiral hand-cranked high-pressure oil cylinder (2), a hydraulic oil chamber (3), a one-way valve (4), a high-pressure oil pipe (5), a hardness display pressure gauge (6), an exhaust unloading valve (7), an oil inlet joint (8), a fracturing probe (9), an alloy fracturing probe (10), a probe front sealing ring (11), a compression spring (12), a probe rear sealing ring (13), a set wire (14), a hydraulic oil cylinder (15), a vertical oil inlet hole (16), a horizontal oil inlet hole blocking wire (17), a horizontal oil inlet hole (18), a vertical oil inlet hole blocking wire (19), a fracturing probe thrust rod (20), a depth display oil cylinder (21), a high-pressure compensation spring (22), a depth display scale (23), a reversing valve (24), an oil return pipe (25), and a supplementary oil tank (26); wherein the device is characterized in that The spiral hand-cranked plunger rod (1) is installed at the lower end of the spiral hand-cranked high-pressure oil cylinder (2), a hydraulic oil chamber (3) is made in the spiral hand-cranked high-pressure oil cylinder (2), and a one-way valve (4) is installed between the high-pressure oil pipe (5) and the spiral hand-cranked high-pressure oil cylinder (2); the hardness display pressure gauge (6) and the exhaust unloading valve (7) are installed on the upper side of the high-pressure oil pipe (5), and the high-pressure oil pipe (5) passes through the fracturing probe propulsion rod (20) and is connected to the oil inlet joint (8), the fracturing probe propulsion rod (20) is fixed on the oil inlet joint (8), and the oil inlet joint (8) is tightened on the fracturing probe (9); the probe front sealing ring (11), the compression spring (12), and the probe rear sealing ring (13) are sequentially sleeved on the outer side of the alloy fracturing probe (10), and the alloy fracturing probe (10) is installed in the hydraulic oil cylinder ( 15) and fixed with a set wire (14); the fracturing probe (9) is respectively provided with a vertical oil inlet hole (16) and a horizontal oil inlet hole (18); the vertical oil inlet hole blocking wire (19) is installed in the vertical oil inlet hole (16), and the horizontal oil inlet hole blocking wire (17) is installed in the horizontal oil inlet hole (18); the high-pressure compensation spring (22) is installed on the depth display scale (23), the depth display scale (23) is installed in the depth display cylinder (21), and the depth display cylinder (21) is installed on the high-pressure oil pipe (5); the two ends of the return oil pipe (25) are respectively connected to the reversing valve (24) and the supplementary oil tank (26), and the reversing valve (24) is installed on the spiral hand-cranked high-pressure oil cylinder (2), forming a device for testing the hardness of different rock layers in the top plate drilling of a coal mine roadway.

2. The device of the rock hardness tester for different rock layers in the coal mine roadway roof drilling according to claim 1 is characterized in that Hold the spiral hand-cranked high-pressure oil cylinder (2) with your left hand, and shake the spiral hand-cranked plunger rod (1) with your right hand. The hydraulic oil enters the fracturing probe (9) from the hydraulic oil chamber (3) through the one-way valve (4), the high-pressure oil pipe (5), and the oil inlet joint (8), and then enters the hydraulic oil cylinder (15) through the horizontal oil inlet hole (18) and the vertical oil inlet hole (16). The hydraulic oil applies pressure to the alloy fracturing probe (10); keep shaking the spiral hand-cranked plunger rod (1), the pressure of the hydraulic oil in the hydraulic oil cylinder (15) increases, and the pressure on the alloy fracturing probe (10) increases. As the pressure increases, the thrust on the rock in the borehole increases until the rock in the borehole is crushed and the pressure of the hardness display pressure gauge (6) drops suddenly. At this time, the shaking of the spiral hand-cranked plunger rod (1) is immediately stopped, and the value of the hardness display pressure gauge (6) before the pressure drops suddenly is observed and counted, that is, the rock hardness value. The expansion and contraction value of the depth display scale (23) after the hardness display pressure gauge (6) drops suddenly is observed and counted, that is, the fracturing depth value of the alloy fracturing probe (10), so as to achieve the purpose of realizing a device for testing the hardness of different rock layers in the top plate drilling of a coal mine roadway.

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