A slurry pump truck for coal mine directional drilling

Abstract

This application relates to the field of coal mine mud pump technology, specifically disclosing a mud pump truck for directional drilling in coal mines. It includes a track assembly, a frame assembly mounted on the track assembly, and, from left to right, an energy storage assembly, a mud pump assembly, a high-pressure filter assembly, a multi-way reversing valve assembly, an oil tank assembly, a mine explosion-proof LED locomotive light, a mine explosion-proof three-phase asynchronous motor, a mine explosion-proof and intrinsically safe vacuum electromagnetic starter, and a table-like mounting platform. A pilot control assembly, a portable methane detector alarm, a mine explosion-proof emergency stop button, and mine explosion-proof control buttons are bolted to the mounting platform. This invention solves the technical problem in existing technologies where, to achieve high-flow, high-pressure mud transportation in coal mines, a dual-pump design with greater flow and pressure or increased pump power is used, leading to accelerated contamination and deterioration of the pump truck's hydraulic oil.

Description

Technical Field

[0001] This invention relates to the field of coal mine mud pump technology, specifically a mud pump truck for directional drilling in coal mines. Background Technology

[0002] During underground drilling in coal mines, the drill bit of a directional drilling rig experiences intense friction with the rock, generating a large amount of heat and causing the temperature to rise continuously. If the temperature becomes too high, the drill bit can easily lose its cutting performance, its wear rate will accelerate dramatically, and its service life will be significantly shortened. Drilling fluid is needed to lubricate and cool the drill bit, as well as to remove rock cuttings generated during drilling. Therefore, directional drilling rigs in coal mine drilling are usually equipped with a mud pump truck to transport drilling fluid. In underground drilling operations in coal mines, the mud pump truck must be able to withstand the high pressure and high flow rate requirements, stably delivering drilling fluid to the required location.

[0003] Currently, the deployment of underground directional drilling technology in coal mines is increasing, which is driving a continuous improvement in the performance requirements of corresponding mud pumps. Facing the expansion of large-diameter, high-level boreholes and the higher demands for construction efficiency, there is a need for mud with stronger flow output and pressure for flushing and cleaning inside the borehole and for effectively driving the drill bit motor. To achieve high-flow mud transportation in underground coal mine conditions, existing technologies typically employ larger power pumps (e.g., pumps with power exceeding 350kW) or a dual-pump design to increase flow. For example, patent document CN109737039B discloses a hydraulically driven dual-mud pump parallel control device, which utilizes the parallel output of two mud pumps to meet various flow requirements under different working conditions during directional drilling.

[0004] While adopting a dual-pump design or increasing the pump's power can indeed achieve high-flow, high-pressure mud transportation in coal mines, it also exacerbates the wear of hydraulic components due to the piston / plunger movement of the pump body, generates metal debris, and makes the hydraulic oil more prone to oxidation under high-pressure conditions, generating acidic substances that corrode the seals. This leads to accelerated contamination and deterioration of the pump truck's power hydraulic oil. Summary of the Invention

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

[0006] 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, comprising a track assembly and a frame assembly mounted on the track assembly, characterized in that: from left to right, 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, an oil tank assembly, a mine explosion-proof LED locomotive light, a mine explosion-proof three-phase asynchronous motor, and a mine explosion-proof and intrinsically safe vacuum electromagnetic starter; the output end of the mine explosion-proof three-phase asynchronous motor is connected to a power assembly, and the high-pressure filter assembly is located between the power assembly and the multi-way reversing valve assembly.

[0007] The beneficial effects of this implementation plan are as follows:

[0008] 1. In order to provide high-flow, high-pressure mud transportation in coal mines, existing hydraulic mud pump trucks adopt a dual-pump design with larger 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 more metal debris in the hydraulic oil. Moreover, the hydraulic oil loses kinetic energy due to internal friction (when the hydraulic oil flows at high speed, the intermolecular viscosity force generates shear friction and loses kinetic energy), turbulent energy dissipation (the Reynolds number increases under high flow, laminar flow becomes turbulent, and the fluid micro-particles collide violently and dissipate kinetic energy) and mechanical friction. The lost kinetic energy is converted into heat energy, which leads to an increase in hydraulic oil temperature. Furthermore, under high-pressure conditions, hydraulic oil is more prone to oxidation, generating acidic substances, which ultimately leads to accelerated contamination and deterioration of the hydraulic oil. This application incorporates a high-pressure filter assembly between the multi-way directional valve assembly and the power assembly. During the piston / plunger movement in the pump body, the hydraulic oil generates metal debris, which is then circulated into the oil tank assembly. Some larger metal debris particles, due to their high density, settle to the bottom of the oil tank assembly, while some fine particles suspended in the hydraulic oil are filtered out by the high-pressure filter assembly between the multi-way directional valve assembly and the power assembly. Therefore, during the circulation process, the hydraulic oil is less likely to experience increased wear on the piston / plunger hydraulic components due to metal debris.

[0009] 2. During circulation, metal debris, carried by the hydraulic oil, impacts hydraulic components, accelerating wear. Furthermore, the acidic substances from the oxidized hydraulic oil corrode the components, causing uneven surfaces, increasing friction and impact, further exacerbating wear, and ultimately shortening the service life of hydraulic components such as plungers and pistons. This application, however, can filter out metal debris from the hydraulic oil, reducing the likelihood of dents in hydraulic components such as plungers and pistons, thus extending their service life.

[0010] 3. The track assembly of this application provides low ground pressure and strong traction, enabling it to easily traverse muddy or sloping areas (up to 30°). The chassis assembly, acting as a stable platform, supports all components, preventing loosening during transport and enhancing equipment reliability. In directional drilling in coal mines, equipment often requires frequent relocation. The track and chassis structure of this application reduces deployment time by 40%, supports 24-hour continuous operation, and adapts to varying underground conditions.

[0011] 4. The structure of the multi-way directional valve assembly includes a valve body, valve core, spring, sealing ring, and safety valve (relief valve). Its structure is relatively precise, and the fit 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 can become embedded in the sliding surface, causing the valve core to jam or increasing the movement resistance, thus affecting the switching response speed. In this application, the high-pressure filter assembly is set between the power assembly and the multi-way directional valve assembly. Therefore, after the hydraulic oil is drawn from the hydraulic oil tank by the power assembly, it will be filtered by the high-pressure filter assembly first, filtering out all metal particles and debris impurities in the hydraulic oil, protecting the multi-way directional valve assembly, and ensuring that the multi-way directional valve assembly of this application remains sensitive even after long-term use.

[0012] Furthermore, the chassis assembly is also equipped with a table-like mounting platform, on which a pilot control assembly, a mine explosion-proof emergency stop button, and a mine explosion-proof control button are bolted and fixed. This application's mud pump truck integrates the pilot control assembly, the mine explosion-proof emergency stop button, and the mine explosion-proof control button onto the mounting platform, resulting in a smaller overall size and easier operation.

[0013] Furthermore, the installation platform is also equipped with a portable methane detector and alarm. Since this application is used in conjunction with a directional drilling rig in a coal mine, and some methane is released during the drilling process, and mud pumps often generate high temperatures, there is a certain risk of leakage when methane levels suddenly increase. The portable methane detector and alarm installed on the mud pump truck of this application can monitor the methane concentration in the coal mine in real time. When the methane concentration exceeds the safety threshold, an alarm is issued promptly, providing a safety warning to operators and preventing safety accidents such as gas explosions.

[0014] Furthermore, the energy storage assembly includes a bladder-type accumulator. The energy storage assembly can store and release energy during the operation of the mud pump, balancing system pressure fluctuations and making mud delivery more stable.

[0015] Furthermore, the multi-way directional valve assembly includes two independent multi-way valves: a main multi-way valve and a secondary multi-way valve. These are used to distribute the power oil source to different actuators, enabling each actuator to operate independently.

[0016] Furthermore, the high-pressure filter assembly is provided with an inlet pipe, and the inner cavity of the high-pressure filter assembly is divided into two chambers: a straight pipe and a filter pipe. A three-way solenoid valve is provided between the inlet pipe and the inner cavity of the high-pressure filter assembly to control the flow ratio of the straight pipe and the filter pipe. The filter pipe is provided with a high-pressure filter element for filtering hydraulic oil.

[0017] Furthermore, the high-pressure filter element built into the filter tube of the high-pressure filter assembly is a BW series filter with shock-absorbing rubber pads. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a front view of the present invention.

[0020] Figure 3 This is a top view of the structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the high-pressure filter assembly of the present invention. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings include: 1. Track assembly; 2. Frame assembly; 3. Energy storage assembly; 4. Mud pump assembly; 5. Multi-way directional valve assembly; 6. Fuel tank assembly; 7. Explosion-proof LED locomotive light for mining; 8. Power assembly; 9. Explosion-proof three-phase asynchronous motor for underground coal mines; 10. Explosion-proof and intrinsically safe vacuum electromagnetic starter for mining; 11. Pilot operation assembly; 12. Portable methane detector alarm; 13. Explosion-proof emergency stop button for mining; 14. Explosion-proof control button for mining; 15. Explosion-proof electric bell for mining; 16. High-pressure filter assembly.

[0024] Implementation, for example, attached Figure 1-4 As shown: A mud pump truck for directional drilling in coal mines includes a track assembly 1 and a frame assembly 2 mounted on the track assembly 1. Figure 1The direction describes the orientation. From left to right, the following components are arranged on the upper surface platform of the frame assembly 2: energy storage assembly 3, mud pump assembly 4, high-pressure filter assembly 16, multi-way reversing valve assembly 5, fuel tank assembly 6, mining explosion-proof LED locomotive light 7, coal mine underground explosion-proof three-phase asynchronous motor 9, mining explosion-proof and intrinsically safe vacuum electromagnetic starter 10, and a table-like mounting platform. All components on the upper surface of the frame assembly 2 are fixed to the frame assembly 2 by bolts for easy disassembly and replacement. The mounting platform is bolted to a pilot operation assembly 11, a portable methane detector alarm 12, a mining explosion-proof emergency stop button 13, and a mining explosion-proof control button 14. A mining explosion-proof electric bell 15 is bolted to the front side wall of the fuel tank assembly 6.

[0025] In the coal mine, an explosion-proof three-phase asynchronous motor 9 is connected to a power assembly 8. The power assembly 8 includes a hydraulic pump and a coupling. The coupling is connected to the output end of the explosion-proof three-phase asynchronous motor 9 in the coal mine, driving the hydraulic pump through the coupling. The power assembly 8 can pressurize and discharge the hydraulic oil from the oil tank assembly 6. The multi-way directional valve assembly 5 controls the power supply for all the actions of the mud pump truck of this application. The multi-way directional valve assembly 5 includes two independent multi-way valves: a main multi-way valve and a secondary multi-way valve, used to distribute the power supply to different hydraulic actuators (such as hydraulic motors), enabling each actuator to operate independently.

[0026] The mud pump assembly 4 consists of a hydraulic motor and a mud pump, which are connected by a coupling. It is hydraulically driven by a power oil source. The power oil source drives the hydraulic motor to rotate, which in turn drives the mud pump to rotate through the coupling, thus delivering 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 into the hydraulic motor are controlled, thereby controlling the output speed of the hydraulic motor and realizing stepless adjustment of the mud pump output flow rate.

[0027] The track assembly 1 includes a frame, track wheels and a hydraulic drive motor. The hydraulic drive motor is driven to rotate by a power oil source, thereby controlling the movement of the track wheels.

[0028] The explosion-proof and intrinsically safe vacuum electromagnetic starter 10 is used to directly control the start, stop, and reversing of the explosion-proof three-phase asynchronous motor 9 used in underground coal mines.

[0029] The energy storage assembly 3 includes a bladder-type accumulator. It is used to absorb flow and pressure fluctuations of the mud pump output medium and maintain pressure stability.

[0030] The high-pressure filter assembly 16 has a branch pipe structure inside, and its structure is as follows: Figure 4As shown, it includes an inlet pipe 161. One end of the inlet pipe 161, connected to the power assembly 8, is inclined upwards at a 15° angle. Hydraulic oil exiting the power assembly 8 enters the inner cavity of the high-pressure filter assembly 16 through the inlet pipe 161. The inner cavity of the high-pressure filter assembly 16 is divided into two chambers, connected to a three-way solenoid valve 168. The three-way solenoid valve 168 is positioned between the inlet pipe 161 and the two chambers, controlling the flow rate of hydraulic oil into each chamber. The upper chamber is a straight pipe 163, and the lower chamber 164 is a filter pipe 164. The straight pipe 163 is a straight pipe without any internal structure, allowing the hydraulic oil, the power source, to pass through directly. The lower filter pipe 164 contains a built-in BW series filter for filtering the hydraulic oil from the power source, and includes a built-in shock-absorbing rubber pad to reduce impact damage to the filter structure during mine car operations. Behind the filter pipe 164 is a semi-enclosed oil chamber 166, with an electromagnet plate at the bottom. Behind the straight pipe 163 is a venturi-structured throat 165. The oil chamber 166 is connected to the throat 165 via a mixing pipe 167, which connects to the oil chamber at one-third of its total height. Therefore, hydraulic oil passing through the filter pipe 164 is drawn into the straight pipe 163 by the throat 165, mixes with the hydraulic oil in the straight pipe 163, exits from the outlet pipe 162, and enters the multi-way directional valve assembly 5 via a braided steel wire hose. From there, the hydraulic oil is distributed by the multi-way directional valve assembly 5 to different hydraulic actuators, driving them to operate independently.

[0031] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described 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 track assembly and a frame assembly mounted on the track assembly, characterized in that: From left to right, the following components are arranged on the upper surface platform of the chassis assembly: energy storage assembly, mud pump assembly, high pressure filter assembly, multi-way reversing valve assembly, oil tank assembly, mine explosion-proof LED locomotive light, coal mine explosion-proof three-phase asynchronous motor, and mine explosion-proof and intrinsically safe vacuum electromagnetic starter. The output end of the explosion-proof three-phase asynchronous motor used in the coal mine is connected to a power assembly, and the high-pressure filter assembly is located between the power assembly and the multi-way reversing valve assembly.

2. The mud pump truck for directional drilling in coal mines according to claim 1, characterized in that: The chassis assembly is also equipped with a table-like mounting platform, on which a pilot control assembly, a mine explosion-proof emergency stop button, and a mine explosion-proof control button are fixedly mounted by bolts.

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

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

5. The mud pump truck for directional drilling in coal mines according to claim 1, characterized in that: The multi-way directional valve assembly includes two independent multi-way valves: a main multi-way valve and a secondary multi-way valve.

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

7. The mud 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 shock-absorbing rubber pads.

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