Mud pump truck for coal mine directional drilling

Abstract

The invention relates to the technical field of coal mine slurry pumps, and particularly discloses a slurry pump truck for coal mine directional drilling. An energy accumulator assembly, a slurry pump assembly, a high-pressure filtering assembly, a multi-way reversing valve assembly, an oil tank assembly, a mining flame-proof LED locomotive lamp, a coal mine underground flame-proof three-phase asynchronous motor, a mining flame-proof and intrinsically safe vacuum electromagnetic starter and an installation platform similar to a table structure are sequentially arranged on a platform on the upper surface of the frame assembly from left to right. A pilot operation assembly, a portable methane detection alarm instrument, a mining flame-proof type scram button and a mining flame-proof type control button are fixedly installed on the installation platform through bolts. The technical problems that in the prior art, in order to achieve high-flow and high-pressure slurry conveying under the coal mine underground condition, the double-pump design with larger flow and pressure is adopted or the power of a pump body is improved, and consequently pollution and degradation acceleration of pump truck power hydraulic oil are caused are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine mud pumps, in particular to a mud pump truck for directional drilling in coal mines. Background Art

[0002] When drilling underground in coal mines, the drill bit of a directional drill rig rubs violently against rock and other materials, generating significant heat and causing the temperature to rise continuously. If the temperature is too high, the drill bit can easily lose its cutting performance, wear out rapidly, and significantly shorten its service life. Drilling fluid is required to lubricate and cool the drill bit, as well as to remove rock cuttings generated during the drilling process. Therefore, directional drill rigs in coal mines are often equipped with a mud pump truck to deliver the drilling fluid. During underground coal mine drilling operations, the mud pump truck must be able to withstand the high pressure and high flow rates required to stably deliver the drilling fluid to the required location.

[0003] At present, the deployment of underground directional drilling technology in coal mines is increasing, which has prompted the continuous improvement of the corresponding mud pump performance requirements. Faced with the expansion of large-diameter high-position drilling and higher requirements for construction efficiency, mud with stronger flow output and pressure is needed for flushing and cleaning inside the borehole and effective driving of the drill motor. In order to achieve high-flow mud transportation under underground conditions in coal mines, the existing technology usually adopts a higher-power pump body (such as: a pump with a power of more than 350kW) or a dual-pump design to increase the flow rate. For example, the patent document in publication number: CN109737039B discloses a hydraulically driven dual-mud pump parallel control device, which utilizes the parallel output of the dual mud pumps to meet the various flow requirements under different working conditions during directional drilling.

[0004] Adopting a dual-pump design or increasing the power of the pump body can indeed achieve high-flow, high-pressure mud transportation under underground coal mine conditions, but it also intensifies the plunger / piston movement of the pump body, aggravates the wear of hydraulic components, generates metal debris, and the hydraulic oil is more easily oxidized under high-pressure conditions, generating acidic substances that corrode seals, which leads to the contamination and accelerated deterioration of the pump truck power hydraulic oil. Summary of the Invention

[0005] The purpose of the present invention is to provide a mud pump truck for directional drilling in coal mines, so as to solve the technical problem mentioned above in the prior art that in order to achieve high-flow and high-pressure mud transportation under underground coal mine conditions, a dual pump design with larger flow and pressure or an increase in the power of the pump body is adopted, which leads to contamination and accelerated deterioration of the power hydraulic oil of the pump truck.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a mud pump truck for directional drilling in coal mines, including a track assembly, a frame assembly arranged on the track assembly, and characterized in that: the frame assembly is provided with an energy storage assembly, a mud pump assembly, a high-pressure filter assembly, a multi-way reversing valve assembly, a fuel tank assembly, a mine explosion-proof LED locomotive light, a flameproof three-phase asynchronous motor for underground coal mines, and a mine explosion-proof and intrinsically safe vacuum electromagnetic starter; the output end of the flameproof three-phase asynchronous motor for underground coal mines is connected to a power assembly, and the high-pressure filter assembly is arranged between the power assembly and the multi-way reversing valve assembly.

[0007] The beneficial effects of this embodiment are: 1. In order to provide high-flow and high-pressure mud transportation under underground conditions in coal mines, hydraulic mud pump trucks in the existing technology adopt a dual-pump design with greater flow and pressure or increase the power of the pump body. The increase in power aggravates the wear of the plunger / piston hydraulic components. The dual-pump design increases the wear of hydraulic components, resulting in an increase in metal debris in the hydraulic oil. In addition, the circulation of hydraulic oil at a large flow and high pressure will lose kinetic energy due to the internal friction effect (when the hydraulic oil flows at high speed, the intermolecular viscosity produces shear friction and loses kinetic energy), turbulent energy dissipation (the Reynolds number increases at a large flow, laminar flow becomes turbulent, and the fluid micro-clusters violently collide and dissipate kinetic energy) and mechanical friction. The lost kinetic energy will be converted into heat energy, causing the hydraulic oil temperature to rise. In addition, under high-pressure conditions, hydraulic oil is more easily oxidized and generates acidic substances, which eventually leads to accelerated contamination and deterioration of the hydraulic oil. The present application provides a high-pressure filter assembly between the multi-way reversing valve assembly and the power assembly. The hydraulic oil generates metal debris during the movement of the plunger / piston of the pump body. The debris will be circulated into the oil tank assembly. Some larger metal debris will settle to the bottom of the oil tank assembly due to their high density, while some fine particles suspended in the hydraulic oil will be filtered out after passing through the high-pressure filter assembly provided between the multi-way reversing valve assembly and the power assembly. Therefore, during the circulation process, the hydraulic oil is not easily affected by metal debris and increases the wear of the plunger / piston hydraulic components.

[0008] 2. Metal debris accompanies the hydraulic oil during circulation, impacting hydraulic components and causing increased wear. Furthermore, the acidic substances produced by oxidized hydraulic oil corrode the components, making their surfaces uneven and increasing friction and impact. This further exacerbates wear and ultimately shortens the service life of hydraulic components such as plungers and pistons. This application, however, can filter out metal debris from the hydraulic oil, minimizing the likelihood of dents on hydraulic components such as plungers and pistons, thereby extending their service life.

[0009] 3. The crawler assembly of this application provides low ground pressure and strong traction, making it easy to navigate muddy or sloped areas (up to 30°). The frame assembly serves as a stable platform, carrying all components and preventing loose parts during transportation, making the equipment more reliable. In coal mine directional drilling, equipment often needs to be frequently moved. The crawler and frame structure of this application can shorten deployment time by 40%, support 24-hour continuous operation, and adapt to changing underground conditions.

[0010] 4. The structure of the multi-way reversing valve assembly includes a valve body, a valve core, a spring, a sealing ring, and a safety valve (overflow valve). Its structure is relatively precise, and the fitting clearance between the valve core and the valve body is extremely small (usually 0.002-0.005mm). Metal particles and debris generated by the friction of mechanical parts in the hydraulic oil will enter the sliding surface, causing the valve core to get stuck or the movement resistance to increase, affecting the switching response speed. The present application arranges the high-pressure filter assembly between the powertrain and the multi-way reversing valve assembly. Therefore, after the hydraulic oil is drawn out of the hydraulic oil tank by the powertrain, it will first be filtered by the high-pressure filter assembly, filtering out all impurities such as metal particles and debris in the hydraulic oil, thereby protecting the multi-way reversing valve assembly and ensuring that the multi-way reversing valve assembly of this application remains sensitive after long-term use.

[0011] Furthermore, the frame assembly is provided with a mounting platform similar to a table structure, on which the pilot operating assembly, a mine flameproof emergency stop button, and a mine flameproof control button are fixedly mounted using bolts. By integrating the pilot operating assembly, the mine flameproof emergency stop button, and the mine flameproof control button on the mounting platform, the mud pump truck of the present application has a smaller overall size and is more convenient to operate.

[0012] Furthermore, the mounting platform is also equipped with a portable methane detection alarm. Since this application is used in conjunction with a directional drill in a coal mine, where some gas is released during drilling and mud pumps often generate high temperatures, there is a certain degree of leakage risk when gas levels suddenly increase. The portable methane detection alarm installed in the mud pump truck of this application can monitor the methane concentration underground in the coal mine in real time. When the methane concentration exceeds the safety threshold, it will promptly issue an alarm, providing a safety warning to the operator and avoiding safety accidents such as gas explosions.

[0013] Furthermore, the energy accumulator assembly includes a bladder accumulator. The arrangement of the energy accumulator assembly can store and release energy during the operation of the mud pump, balance the system pressure fluctuations, and make the mud delivery more stable.

[0014] Furthermore, the multi-way reversing valve assembly includes two groups of independent multi-way valves, namely a main multi-way valve and an auxiliary multi-way valve, which are used to distribute the power oil source to different actuators so that each actuator can act independently.

[0015] Furthermore, the high-pressure filter assembly is provided with a liquid inlet pipe, the inner cavity of the high-pressure filter assembly is divided into two tube cavities, a straight-through pipe and a filter tube, a three-way solenoid valve is provided between the liquid inlet pipe and the inner cavity of the high-pressure filter assembly to control the flow ratio of the straight-through pipe and the filter tube, and a high-pressure filter element for filtering hydraulic oil is provided in the filter tube.

[0016] Furthermore, the high-pressure filter element built into the filter tube of the high-pressure filter assembly is a BW series filter with a shock-absorbing rubber pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention, Figure 2 This is a schematic diagram of the front structure of the present invention. Figure 3 This is a schematic diagram of the top view of the structure of the present invention, Figure 4 It is a structural schematic diagram of the high-pressure filter assembly of the present invention. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: track assembly 1, frame assembly 2, energy storage assembly 3, mud pump assembly 4, multi-way reversing valve assembly 5, fuel tank assembly 6, mining flameproof LED locomotive light 7, power assembly 8, underground coal mine flameproof three-phase asynchronous motor 9, mining flameproof and intrinsically safe vacuum electromagnetic starter 10, pilot operation assembly 11, portable methane detection alarm 12, mining flameproof emergency stop button 13, mining flameproof control button 14, mining flameproof electric bell 15, high-pressure filter assembly 16.

[0019] Implementation example Figure 1-4 As shown: A mud pump truck for directional drilling in coal mines, comprising a crawler assembly 1, and a frame assembly 2 arranged on the crawler assembly 1. Figure 1 The direction is described. On the upper surface platform of the vehicle frame assembly 2, arranged from left to right are the energy accumulator assembly 3, the mud pump assembly 4, the high-pressure filter assembly 16, the multi-way reversing valve assembly 5, the fuel tank assembly 6, the mining flameproof LED locomotive light 7, the underground coal mine flameproof three-phase asynchronous motor 9, the mining flameproof and intrinsically safe vacuum electromagnetic starter 10, and a table-like mounting platform. All components mounted on the upper surface of the vehicle frame assembly 2 are bolted to the vehicle frame assembly 2, facilitating removal and replacement. Bolted to the mounting platform are the pilot operating assembly 11, the portable methane detector alarm 12, the mining flameproof emergency stop button 13, and the mining flameproof control button 14. A mining flameproof electric bell 15 is bolted to the front sidewall of the fuel tank assembly 6.

[0020] A flameproof three-phase asynchronous motor 9 is connected to a power assembly 8 in an underground coal mine. Power assembly 8 includes a hydraulic pump and a coupling. The coupling is connected to the output terminal of the flameproof three-phase asynchronous motor 9, driving the hydraulic pump through the coupling. Power assembly 8 pressurizes and drains hydraulic oil from a tank assembly 6, which is controlled by a multi-way reversing valve assembly 5 to provide the power source for all the actuators of the slurry pump truck. The multi-way reversing valve assembly 5 comprises two independent multi-way valves, a main multi-way valve and a secondary multi-way valve, which distribute the power source to different hydraulic actuators (such as hydraulic motors), enabling independent operation of each actuator.

[0021] The mud pump assembly 4 comprises a hydraulic motor and a mud pump, which are connected by a coupling and hydraulically driven by a power oil source. The power oil source drives the hydraulic motor to rotate, and then drives the mud pump to rotate through the coupling to deliver mud (drilling fluid) to the directional drilling rig. By changing the valve core opening of the multi-way reversing valve assembly 5, the flow rate and hydraulic pressure of the power oil source flowing into the hydraulic motor are controlled, and then the output speed of the hydraulic motor is controlled, thereby realizing stepless adjustment of the output flow of the mud pump.

[0022] The crawler track assembly 1 includes a frame, crawler wheels and a hydraulic drive motor. The hydraulic drive motor is driven by a power oil source to rotate, thereby controlling the crawler wheels to move.

[0023] The mine flameproof and intrinsically safe vacuum electromagnetic starter 10 is used to directly control the start, stop and reversing of a flameproof three-phase asynchronous motor 9 used in underground coal mines.

[0024] The accumulator assembly 3 includes a bladder accumulator, which is used to absorb the flow and pressure fluctuations of the output medium of the mud pump and maintain the pressure stable.

[0025] The high pressure filter assembly 16 has a branch pipe structure, and its structure is as follows: Figure 4As shown, it includes a liquid inlet pipe 161. The end of the liquid inlet pipe 161 connected to the power assembly 8 is tilted upward at an angle of 15°. After the hydraulic oil comes out of the power assembly 8, it enters the inner cavity of the high-pressure filter assembly 16 through the liquid inlet pipe 161. The inner cavity of the high-pressure filter assembly 16 is divided into two cavities. The two cavities are connected to a three-way solenoid valve 168. The three-way solenoid valve 168 is set between the liquid inlet pipe 161 and the two cavities. The flow of hydraulic oil flowing into different cavities is controlled by the three-way solenoid valve 168. The upper cavity is a straight-through pipe 163, and the lower cavity 164 is a filter pipe 164. The straight-through pipe 163 is a straight pipe without any structure inside. Therefore, the night pressure oil as the power oil source can pass directly. The lower filter pipe 164 has a built-in BW series filter for filtering the hydraulic oil of the power oil source. It has a built-in shock-absorbing rubber pad to reduce the impact of the mine car operation on the filter structure. Behind filter tube 164 is a semi-enclosed oil chamber 166, the bottom plate of which is an electromagnet plate. Behind straight-through tube 163 is a venturi-structured throat 165, connected to oil chamber 166 via a mixing pipe 167. The height of mixing pipe 167 connecting to the oil chamber is one-third of the total height of oil chamber 166. Therefore, hydraulic oil passing through filter tube 164 is drawn into straight-through tube 163 through throat 165, where it mixes with the hydraulic oil in straight-through tube 163 before exiting through outlet pipe 162 and entering multi-way directional valve assembly 5 through a braided steel wire hydraulic hose. The oil is then distributed by the power oil source of multi-way directional valve assembly 5 to different hydraulic actuators, driving them to operate independently.

[0026] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A mud pump truck for directional drilling in coal mines, comprising a crawler assembly, a frame assembly disposed on the crawler assembly, and characterized in that: On the upper surface platform of the frame assembly, from left to right, there are arranged the energy accumulator assembly, mud pump assembly, high-pressure filter assembly, multi-way reversing valve assembly, fuel tank assembly, mining flameproof LED locomotive lights, coal mine flameproof three-phase asynchronous motor, mining flameproof and intrinsically safe vacuum electromagnetic starter; The output end of the flameproof three-phase asynchronous motor for underground coal mines is connected to a power assembly, and the high-pressure filter assembly is arranged between the power assembly and the multi-way reversing valve assembly.

2. The slurry pump truck for directional drilling in coal mines according to claim 1, characterized in that: The frame assembly is also provided with a mounting platform with a table-like structure, on which a pilot operation assembly, a mine flameproof emergency stop button, and a mine flameproof control button are fixedly mounted by bolts.

3. The slurry pump truck for directional drilling in coal mines according to claim 2, characterized in that: The installation platform is also provided with a portable methane detection alarm.

4. The slurry pump truck for directional drilling in coal mines according to claim 1, characterized in that: The energy storage device assembly includes a bladder type energy storage device.

5. The slurry pump truck for directional drilling in coal mines according to claim 1, characterized in that: The multi-way reversing valve assembly includes two groups of independent multi-way valves, a main multi-way valve and an auxiliary multi-way valve.

6. The slurry pump truck for directional drilling in coal mines according to claim 1, characterized in that: The high-pressure filter assembly is provided with a liquid inlet pipe, the inner cavity of the high-pressure filter assembly is divided into two cavities, a straight-through pipe and a filter pipe, a three-way solenoid valve is provided between the liquid inlet pipe and the inner cavity of the high-pressure filter assembly to control the flow ratio of the straight-through pipe and the filter pipe, and a high-pressure filter element for filtering hydraulic oil is provided in the filter pipe.

7. The slurry pump truck for directional drilling in coal mines according to claim 1, characterized in that: The high-pressure filter element built into the filter tube of the high-pressure filter assembly is a BW series filter with a shock-absorbing rubber pad.

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