Mining mud purifying, pressurizing and circulating device and method

Abstract

The invention belongs to the field of mechanical design, and relates to a mine mud purification, pressurization and circulation device and method, the device adopts a crawler-type mobile platform to integrate a vibrating screen, a slurry pump, a mud pump, a filter and a hydraulic control system, and innovatively realizes in-situ solid-liquid separation and circulation pressurization of a mud flushing fluid orifice flowback mixture. The slag-containing slurry is guided into a high-frequency vibrating screen through a spiral auger conveying device, and large-particle drilling slag is separated while micron-sized effective components are reserved; and after the purified slurry is stored in the transfer water tank, filtering, pressurizing and stable-pressure conveying are completed by a multi-stage pump set, so that a closed-loop circulating system is formed. The hydraulic control module adopts the collaborative design of a load-sensitive pump and a multi-way valve, and safe switching of the walking anchoring function, the slurry treatment function and the high-pressure conveying function is achieved. The method is simple and easy to implement, is suitable for various mine operation environments, and can remarkably improve the mining efficiency and the resource utilization rate.

Description

Technical Field

[0001] The invention belongs to the field of mechanical design and relates to a mining mud purification pressurization circulation device and method. Background Art

[0002] In the directional drilling construction of coal mines, drilling mud (also known as mud flushing fluid in coal mines, or mud for short) plays a vital role. It can not only stabilize the well wall, carry and transport rock cuttings, but also effectively cool the drill and improve drilling efficiency. In recent years, with the continuous advancement of coal mining technology, the application of mud in long-distance directional drilling construction under special geological conditions has become more and more extensive. However, the treatment and recycling of mud flushing fluid has always been an important factor restricting the efficiency of underground coal mine drilling construction.

[0003] At present, there are obvious limitations in the treatment methods of the returned slag water mixture on the market. The first method is relatively simple, which only involves the sedimentation and separation of slag water and then discharge on site. However, this method has many disadvantages. First, the configuration cost of the mud flushing fluid is high, and if it is discharged after only one use, it will cause huge waste. Secondly, the harmful substances in the mud may pollute the environment, especially the special environment of coal mines. Once polluted, the difficulty of governance will be greatly increased. In addition, on-site discharge is also prone to water accumulation in the drilling site, affecting the construction environment and even causing safety accidents.

[0004] In order to solve the above problems, the second method came into being, that is, using independent solid-liquid separation equipment to treat the slag-water mixture. This method first separates the slag-water mixture into solid and liquid, and then pumps the separated mud into a water tank, and then pumps it into a mud pump truck for pressurization through a slag slurry pump, and finally flows to the water braid connected to the directional drilling rig, and is transported to the bottom of the hole through the drill pipe for recycling. Although this method improves the utilization rate of mud to a certain extent, its application is greatly limited under the conditions of narrow space in the underground drilling site of coal mines.

[0005] Specifically, the second method requires a lot of equipment, including directional drilling rigs, mud pump trucks, large-capacity water tanks, solid-liquid separation devices, etc. These equipment not only occupy a large area, but also have complex pipeline connections, and some equipment is difficult to transport. In the special environment of underground coal mines, the transportation and installation of equipment is itself a difficult task. In addition, due to the limited space of the drilling site underground in coal mines, the layout and installation of equipment are often greatly restricted, resulting in overall inefficiency.

[0006] What is more serious is that existing solid-liquid separation equipment often has accuracy problems when processing mud. Since the mud contains a large number of tiny particles, such as clay, weighting agents, etc., these components are crucial to the performance of the mud. However, when processing mud, existing solid-liquid separation equipment often tends to filter out these tiny particles, resulting in mud dilution, and eventually losing its original functions of stabilizing the well wall, controlling formation pressure, carrying chips and cooling, and lubricating motors and drilling tools. This not only affects the recycling effect of the mud, but may also lead to a series of problems in drilling construction.

[0007] In addition to equipment and technical limitations, factors such as limited space in underground mine drilling sites, uneven ground, and drilling orientation (high and low drilling) also have a great impact on the recycling of mud. Due to the high and low water level differences caused by these factors, multi-stage water tanks and water pumps need to be configured to work together. This not only increases the complexity and cost of the equipment, but also makes the on-site pipeline layout more complicated, further reducing the overall efficiency.

[0008] In summary, the existing processing technology and equipment for underground drilling flushing fluid have many problems and shortcomings. In order to solve these problems, a new type of mining mud purification pressurization circulation device and method is needed. Summary of the invention

[0009] In view of this, the purpose of the present invention is to provide a mining mud purification pressurization circulation device and method to solve the existing problems.

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mining mud purification boosting circulation device, comprising a crawler vehicle platform, on which a mud collection module, a solid-liquid separation module, a storage module, a boosting module and a hydraulic control module are integrated; the mud collection module comprises a hose conveying device, whose feed inlet is connected to the discharge port of the orifice blowout prevention device, and is used to receive and convey the returned mud, slag and water mixture; the solid-liquid separation module comprises a vibrating screen, whose feed inlet is connected to the discharge port of the hose conveying device, and is used to separate large-particle drilling slag, and the mud under the screen passes through the sieve holes at the bottom of the vibrating screen. discharge; the storage module includes a transfer water tank arranged below the vibrating screen and used to receive the mud under the screen, which is connected to the boosting module through a pipeline; the boosting module includes a slurry pump, a water inlet filter, a mud pump and an accumulator connected in sequence, the inlet of the slurry pump is connected to the transfer water tank through a pipeline, the mud in the transfer water tank is pumped into the water inlet filter, the mud pump is pressurized after filtration, and the accumulator is used to stabilize the pressure and output it to the drill pipe of the directional drilling rig; the hydraulic control module includes a main multi-way valve, an auxiliary multi-way valve, a control switching valve, an oil tank, a cooler and a motor assembly.

[0011] Optionally, an auxiliary positioning unit is also included, which includes four lower anchoring cylinders and controls the fixing and leveling of the crawler vehicle platform through an auxiliary multi-way valve.

[0012] Optionally, it also includes an electrical control module, which includes an operating console, an auxiliary operating console, an emergency stop button and an electromagnetic starter; the operating console is provided with a bypass throttle valve for adjusting the rotation speed of the slurry pump and the hose conveying device; the emergency stop button is electrically connected to the electromagnetic starter for emergency power cut-off.

[0013] Optionally, the main multi-way valve of the hydraulic control module is a three-piece hydraulically controlled pilot load-sensitive valve, whose input end is connected to a large pump driven by a motor assembly, and whose output ends respectively control the mud pump motor and the left and right travel motors of the crawler vehicle; the auxiliary multi-way valve includes a two-piece load-sensitive valve and a five-piece hydraulically controlled multi-way valve, whose input ends are connected to a small pump driven by the motor assembly; the two-piece load-sensitive valve controls the slurry pump motor and the spiral auger motor of the hose conveying device, and the five-piece hydraulically controlled multi-way valve controls the lower anchor cylinder and the transfer water tank propulsion cylinder; the control switching valve is arranged on the main multi-way valve control oil circuit.

[0014] Optionally, in the hydraulic control module, a cooler is arranged on the oil return line of the oil tank to reduce the temperature of the hydraulic oil; and the motor assembly is a dual-pump drive structure, which supplies oil to the main multi-way valve and the auxiliary multi-way valve respectively.

[0015] Optionally, a float valve is provided in the transfer water tank, which is connected to an underground water source through an external water pipe.

[0016] A method for purifying and pressurizing a mining mud circulation, using the above-mentioned device for purifying and pressurizing a mining mud circulation, comprises the following steps:

[0017] S1, mud collection and initial separation;

[0018] The mud, slag and water mixture returned from the orifice is received by a hose conveying device and conveyed to the vibrating screen through a spiral auger; the vibrating screen separates large particles of drilling slag through composite vibration, and the mud under the screen enters the transfer water tank;

[0019] S2, mud purification and pressurization;

[0020] The slurry pump pumps the mud in the transfer water tank to the water inlet filter for secondary filtration; the mud after secondary filtration is pressurized by the mud pump and then transported to the drill pipe of the directional drilling rig after being stabilized by the accumulator;

[0021] S3, recycling;

[0022] The high-pressure mud is transported to the bottom of the hole through the drill pipe. After completing the functions of carrying slag, cooling and stabilizing the hole wall, it is returned to the hole mouth again to form a circulation.

[0023] Optionally, in steps S1 and S2, the control of mud transportation and pressurization is achieved through a hydraulic system, specifically including: operating the control switching valve to switch to the "mud boost gear", starting the slurry pump and the hose conveying device; controlling the operation of the mud pump through the main multi-way valve, and adjusting the speed of the slurry pump through the auxiliary multi-way valve.

[0024] Optionally, the control of the hydraulic system also includes: when the mud pump is running, locking the crawler vehicle's travel function by controlling the switching valve to prevent the platform from moving due to misoperation; and adjusting the speed of the slurry pump and hose conveying device in real time through the bypass throttle valve to match the drilling flow demand.

[0025] Optionally, the liquid level is automatically monitored by a float valve in the transfer tank, and the downhole water source is replenished when the liquid level falls below a set threshold.

[0026] The beneficial effects of the present invention are:

[0027] 1) Solved the problem that the mud flushing liquid cannot be separated from the solid and liquid in situ and recycled: The coal mine underground mud purification booster circulation device designed by the present invention realizes the solid-liquid separation of the mud flushing liquid in situ in the coal mine through an integrated design. This innovation not only avoids the problem of discharge of the mud flushing liquid after one-time use, but also greatly improves the utilization rate of the mud, thereby saving a lot of drilling construction production costs.

[0028] 2) The overall device is miniaturized and universally designed: All the main functional components of the device are concentrated on the crawler platform. This design not only makes the device compact and occupies a small area, but also facilitates the migration and transportation of the device. At the same time, the miniaturization of the overall device also reduces the space requirements for the underground drilling site of the coal mine, allowing the device to be flexibly used in various complex underground environments.

[0029] 3) Simplified construction process and improved construction efficiency: By integrating the functions of collecting, purifying, pumping, and circulating mud flushing liquid into one device, the present invention greatly simplifies the construction process. In directional drilling construction, only one directional drilling rig and the mud purification and pressurization circulation device are needed to complete the mud purification circulation and directional drilling, without the need to configure other complex auxiliary equipment. This not only reduces the amount of operation for construction personnel, but also improves the overall construction efficiency.

[0030] 4) Improved construction environment and reduced environmental pollution: The mud purification and pressurization circulation device of the present invention can effectively reduce the number of auxiliary drilling equipment in the drilling site, thereby reducing the cumbersome process of complex pipeline connections and workers moving back and forth from different equipment. This not only makes the construction site more tidy and orderly, but also reduces noise and pollution emissions during the construction process, which is conducive to protecting the ecological environment of coal mines.

[0031] 5) Improved mud performance and stability: During the mud purification process, the device can retain the tiny particle components in the mud, such as clay, weighting agent, etc., which are crucial to the performance of the mud. By avoiding the mud dilution problem caused by excessive filtration, the present invention ensures the stability and functionality of the mud, thereby improving the quality and efficiency of drilling construction.

[0032] 6) Enhanced adaptability and flexibility of the device: The mud purification booster circulation device of the present invention adopts a combination of hydraulic and electrical control, making the operation easier and faster. At the same time, the device also has automatic adjustment and monitoring functions, and can be flexibly adjusted and optimized according to actual construction conditions. This design not only improves the adaptability and flexibility of the device, but also further improves the construction efficiency and quality.

[0033] In summary, the mining mud purification and pressurization circulation device of the present invention has shown significant beneficial effects in solving the problems of the prior art, improving construction efficiency, improving the construction environment, and reducing environmental pollution.

[0034] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 It is the overall structural front view of the present invention;

[0037] Figure 2 It is a top view of the overall structure of the present invention;

[0038] Figure 3 It is a schematic diagram of the hydraulic principle of the present invention.

[0039] Figure numerals: hose conveying device 1, main multi-way valve 2, motor assembly 3, oil tank 4, cooler 5, auxiliary multi-way valve 6, crawler vehicle platform 7, lower anchor cylinder 8, transfer water tank 9, slurry pump 10, vibrating screen 11, control switching valve 12, emergency stop button 13, operating table 14, auxiliary operating table 15, electromagnetic starter 16, water inlet filter 17, accumulator 18, mud pump 19, float valve 20. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0041] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0042] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] In order to more specifically describe the mining mud purification pressurization circulation device and method of the present invention, the following is combined with the attached Figures 1 to 3 A specific example is given.

[0044] 1. Device Structure (Please refer to Figure 1-2 )

[0045] The mining mud purification, pressurization and circulation device of the present invention mainly comprises a crawler vehicle platform 7, on which a plurality of functional modules are integrated to realize the functions of collecting, purifying, storing, pressurizing and circulating the mud.

[0046] 1. Mud collection module

[0047] Hose conveying device 1: Its feed port is connected to the discharge port of the orifice blowout prevention device, and is used to receive and convey the mud, slag and water mixture returned from the orifice. During the mud collection process, the hose conveying device 1 conveys the mud mixture from the orifice to the subsequent processing unit through the spiral auger inside it.

[0048] 2. Solid-liquid separation module

[0049] Vibrating screen 11: Its inlet is connected to the outlet of the hose conveying device 1, and is used to separate large particles of drill cuttings in the mud. The vibrating screen 11 uses a composite vibration method to retain large particles of drill cuttings in the mud mixture on the screen, and discharges them to the outlet with the vibration movement. The mud under the screen is discharged through the screen holes at the bottom of the vibrating screen and enters the storage module.

[0050] 3. Storage Module

[0051] Transfer water tank 9: It is located below the vibrating screen 11 and is used to receive the mud under the screen. The transfer water tank 9 is connected to the booster module through a pipeline to provide a mud source for subsequent mud boosting. In addition, a float valve 20 is also provided in the transfer water tank 9, which is connected to the underground water source through an external water pipe to automatically monitor and replenish mud loss.

[0052] 4. Booster module

[0053] Slurry pump 10: Its inlet is connected to the transfer water tank 9 through a pipeline, and the slurry in the transfer water tank is pumped into the water inlet filter 17.

[0054] Inlet filter 17: performs secondary filtration on the slurry from the slurry pump 10 to remove the tiny particle impurities remaining in the slurry.

[0055] Mud pump 19: pressurizes the mud after secondary filtration to reach a high pressure state.

[0056] Accumulator 18: It stabilizes the pressure of the high-pressure mud from the mud pump 19 to ensure the stable output of the mud.

[0057] 5. Hydraulic control module

[0058] Main multi-way valve 2: It is a three-piece hydraulically controlled pilot load-sensitive valve, the input end of which is connected to the large pump driven by the motor assembly 3, and the output end controls the mud pump motor and the left and right travel motors of the crawler vehicle respectively.

[0059] Auxiliary multi-way valve 6: includes a two-piece load-sensitive valve and a five-piece hydraulically controlled multi-way valve, and the input end is connected to the small pump driven by the motor assembly 3. Among them, the two-piece load-sensitive valve controls the slurry pump motor and the screw auger motor of the hose conveying device 1; the five-piece hydraulically controlled multi-way valve controls the lower anchor cylinder 8 and the transfer water tank propulsion cylinder.

[0060] Control switching valve 12: arranged on the control oil circuit of main multi-way valve 2, used for switching between crawler vehicle traveling function and mud boosting function.

[0061] Oil tank 4: provides hydraulic oil to the hydraulic system.

[0062] Cooler 5: It is arranged on the oil return line of the oil tank 4 and is used to reduce the temperature of the hydraulic oil.

[0063] Motor assembly 3: It is a dual pump drive structure, supplying oil to the main multi-way valve 2 and the auxiliary multi-way valve 6 respectively.

[0064] 6. Auxiliary positioning unit

[0065] Lower anchoring cylinder 8: controlled by auxiliary multi-way valve 6, used for fixing and leveling the crawler vehicle platform 7 to ensure the stability of the device during operation.

[0066] 7.Electrical control module

[0067] The operating console 14 is provided with a bypass throttle valve for adjusting the rotation speed of the slurry pump 10 and the hose conveying device 1 .

[0068] Auxiliary operation console 15: provides an additional operation interface to facilitate construction personnel to operate and monitor the device.

[0069] Emergency stop button 13: electrically connected to the electromagnetic starter 16, used to cut off the power supply in an emergency to ensure construction safety.

[0070] Electromagnetic starter 16: used to control the start and stop of the device.

[0071] 2. Workflow

[0072] During the whole working process, the construction personnel can monitor and adjust the device in real time through the operation table 14 and the auxiliary operation table 15. At the same time, the float valve 20 automatically monitors the liquid level of the transfer water tank 9 and automatically replenishes the underground water source when the liquid level is lower than the set threshold, ensuring the continuous and stable operation of the device.

[0073] In this embodiment, the working principle of the hydraulic control system of this device is as follows: Figure 3 As shown: the oil supply system uses two load-sensitive pumps of different sizes connected in series to supply oil. The main multi-way valve 2 takes oil from the large pump. The valve is a three-piece hydraulic pilot load-sensitive valve that controls the mud pump motor and the left and right travel motors of the crawler vehicle. In order to prevent the crawler vehicle from moving due to misoperation of the travel handle when the mud pump is working, a switching valve is introduced into the control oil circuit to switch the "mud pump-travel function" control.

[0074] The other two auxiliary function multi-way valves are a two-piece load-sensitive valve and a five-piece hydraulic multi-way valve, both of which supply oil to small pumps. The former controls the slurry pump motor and the hose conveying motor, and adjusts the speed through bypass throttling. The latter controls the front and rear four lower anchor cylinders of the crawler vehicle to adjust the platform and the propulsion cylinder to control the position of the transfer water tank. The two valve groups are controlled by switching valves for function switching.

[0075] When the directional drill starts to use drilling mud for drilling construction, the operation process of the mud downhole booster circulation device is as follows: operate the electromagnetic starter 16 switch to connect the power of the vibrating screen 11 and the motor assembly 3 respectively. Move the control switch valve 12 handle to the anchor auxiliary function position, start operating the auxiliary multi-way valve 6 handle, adjust the anchor under the crawler, and operate the propulsion cylinder handle to extend the transfer water tank 9. Adjust the "walking-mud switch valve" handle on the auxiliary operating table 15 to the mud boost gear, and operate the control switch valve 12 to the mud transport gear. Control the handle on the operating table 14 to start the slurry pump 10 and the hose conveying device 1, and adjust the throttle valve on the operating table according to the actual drilling flow during operation to control the speed of the slurry pump and the hose conveying motor. When an emergency occurs and it is necessary to stop, quickly press the emergency stop button 13 to turn off the power and stop all actions.

[0076] During the above operation, the mud purification and pressurization circulation process is as follows: the mud, slag and water mixture returned from the hole is separated into gas and liquid through the hole mouth blowout prevention device, and the separated slag-containing liquid enters the inlet of the hose conveying device 1 connected to the blowout prevention device. The spiral auger blades are driven to rotate under the rotation of the conveying device motor, and the mud mixture is sucked into the vibrating screen 11 above the crawler platform for filtration. After the screen is continuously vibrated horizontally and vertically, large particles of solid impurities are retained on the screen and follow the vibration, and finally move to the vibrating screen outlet for discharge, and the mud slurry enters the transfer water tank 9 at the lower end of the platform through the fine holes of the screen. Subsequently, the slurry pump 10 in the water tank pumps the purified mud liquid to the water inlet filter 17 for large particle coal slag filtration again, and then enters the mud pump for pressurization, and under the pressure stabilization of the accumulator 18, stable high-pressure mud is finally formed to enter the drill pipe of the directional drilling rig, drive the bottom hole motor to rotate, stabilize the wall pressure of the channel, cool the drilling tool, and finally realize the recycling of mud. During the movement of the mud, one end of the float valve 20 in the transfer water tank 9 is connected to the downhole water pipe, which can automatically monitor and replenish the mud loss caused by hole wall penetration, filtration and transportation.

[0077] The coal mine underground mud purification boosting circulation device designed by the present invention solves the problem that the existing mud flushing fluid cannot be separated into solid and liquid in situ and recycled in the coal mine, saving a lot of drilling construction production costs.

[0078] The underground coal mine mud purification boosting circulation device designed by the present invention innovatively integrates the functions of mud flushing liquid collection, purification, pumping, circulation, etc. in the underground coal mine directional drilling construction, and achieves the miniaturization and universal design of the overall device. It solves the problems that the existing underground drilling auxiliary equipment is isolated, resulting in too many devices involved in the whole system, large space area, complex pipeline connection, difficult transportation, and cumbersome personnel operation. In the directional drilling construction, only one directional drilling rig and the mud purification boosting circulation device are needed to complete the mud purification circulation and directional drilling, which greatly improves the construction efficiency.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A mining mud purification pressurization circulation device, characterized in that: It includes a crawler vehicle platform on which a mud collection module, a solid-liquid separation module, a storage module, a booster module and a hydraulic control module are integrated; The mud collection module includes a hose conveying device, the feed port of which is connected to the discharge port of the orifice blowout prevention device, and is used to receive and convey the return mud, slag and water mixture; The solid-liquid separation module includes a vibrating screen, whose feed port is connected to the discharge port of the hose conveying device, and is used to separate large-particle drilling cuttings, and the mud under the screen is discharged through the screen holes at the bottom of the vibrating screen; The storage module includes a transfer water tank disposed below the vibrating screen and used to receive the mud under the screen, and the transfer water tank is connected to the boosting module through a pipeline; The booster module includes a slurry pump, a water inlet filter, a mud pump and an accumulator connected in sequence. The inlet of the slurry pump is connected to the transfer water tank through a pipeline, and the mud in the transfer water tank is pumped into the water inlet filter. After filtering, the mud pump boosts the pressure, and the accumulator stabilizes the pressure and outputs it to the drill pipe of the directional drilling rig. The hydraulic control module includes a main multi-way valve, an auxiliary multi-way valve, a control switching valve, an oil tank, a cooler and a motor assembly.

2. The mining mud purification pressurization circulation device according to claim 1 is characterized in that: It also includes an auxiliary positioning unit, which includes four lower anchoring cylinders and controls the fixing and leveling of the crawler vehicle platform through an auxiliary multi-way valve.

3. The mining mud purification pressurization circulation device according to claim 1 is characterized in that: It also includes an electrical control module, which includes an operating console, an auxiliary operating console, an emergency stop button and an electromagnetic starter; The operating console is provided with a bypass throttle valve for adjusting the rotation speed of the slurry pump and the hose conveying device; the emergency stop button is electrically connected to the electromagnetic starter and is used to cut off the power supply in an emergency.

4. The mining mud purification pressurization circulation device according to claim 1 is characterized in that: The main multi-way valve of the hydraulic control module is a three-piece hydraulically controlled pilot load-sensitive valve, the input end of which is connected to the large pump driven by the motor assembly, and the output end controls the mud pump motor and the left and right travel motors of the crawler vehicle respectively; the auxiliary multi-way valve includes a two-piece load-sensitive valve and a five-piece hydraulically controlled multi-way valve, the input end of which is connected to the small pump driven by the motor assembly; the two-piece load-sensitive valve controls the slurry pump motor and the spiral auger motor of the hose conveying device, and the five-piece hydraulically controlled multi-way valve controls the lower anchor cylinder and the transfer water tank propulsion cylinder; the control switching valve is arranged on the main multi-way valve control oil circuit.

5. The mining mud purification pressurization circulation device according to claim 1 is characterized in that: In the hydraulic control module, a cooler is arranged on the oil return line of the oil tank to reduce the temperature of the hydraulic oil; the motor assembly is a dual-pump drive structure, which supplies oil to the main multi-way valve and the auxiliary multi-way valve respectively.

6. The mining mud purification pressurization circulation device according to claim 1 is characterized in that: A float valve is installed in the transfer water tank, which is connected to the underground water source through an external water pipe.

7. A method for purifying and pressurizing a mining mud, using a mining mud purifying and pressurizing a mining mud circulation device as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1, mud collection and initial separation; The mud, slag and water mixture returned from the orifice is received by a hose conveying device and conveyed to the vibrating screen through a spiral auger; the vibrating screen separates large particles of drilling slag through composite vibration, and the mud under the screen enters the transfer water tank; S2, mud purification and pressurization; The slurry pump pumps the mud in the transfer water tank to the water inlet filter for secondary filtration; the mud after secondary filtration is pressurized by the mud pump and then transported to the drill pipe of the directional drilling rig after being stabilized by the accumulator; S3, recycling; The high-pressure mud is transported to the bottom of the hole through the drill pipe. After completing the functions of carrying slag, cooling and stabilizing the hole wall, it is returned to the hole mouth again to form a circulation.

8. A mining mud purification pressurization circulation method according to claim 7, characterized in that: In the steps S1 and S2, the control of mud delivery and pressurization is achieved through a hydraulic system, which specifically includes: The operation control switching valve is switched to the "mud boost gear" to start the slurry pump and the hose conveying device; the operation of the mud pump is controlled by the main multi-way valve, and the speed of the slurry pump is adjusted by the auxiliary multi-way valve.

9. A mining mud purification pressurization circulation method according to claim 8, characterized in that: The control of the hydraulic system also includes: when the mud pump is running, the crawler vehicle's travel function is locked by controlling the switching valve to prevent the platform from moving due to misoperation; the speed of the slurry pump and hose conveying device is adjusted in real time through the bypass throttle valve to match the drilling flow demand.

10. A mining mud purification pressurization circulation method according to claim 7, characterized in that: The liquid level is automatically monitored by the float valve in the transfer water tank, and the underground water source is replenished when the liquid level falls below the set threshold.

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