Drilling and sampling integrated pneumatic drilling rig and control method based on static pressure air source

Abstract

The present invention discloses a pneumatic drilling rig and a control method for drilling and sampling based on a static pressure wind source, wherein the pneumatic drilling rig comprises: a drilling tool component and a pneumatic system; the drill bit in the drilling tool component is provided with an axially penetrating through hole, the double-wall spiral drill rod has inner and outer drill rods arranged coaxially, the double-channel tail braid is provided with lateral ventilation holes connected to the outer channel, the axial ventilation holes connected to the inner channel, and a jet hole connected to the outer channel is provided near the drill bit; the pneumatic system comprises an air inlet connected to the static pressure wind source of the coal mine, a first air outlet and a second air outlet that can be opened and closed, and a power component near the exhaust port; the present invention takes the static pressure wind source as the input source, and is more environmentally friendly while providing basic power, and realizes the adjustment and switching of drilling slag discharge, normal pressure wind sampling, and pressurized air sampling, and sampling is performed without withdrawing the drill rod, thereby effectively improving the drilling sampling efficiency and avoiding the problems of long process time and poor timeliness.

Description

Technical Field

[0001] The invention relates to engineering mechanical drilling technology, belongs to the field of coal mining, and specifically relates to a drilling and sampling integrated pneumatic drilling rig and a control method based on a static pressure wind source. Background Art

[0002] In the process of coal mining, drilling sampling is an important task, which is of great significance in helping workers understand the geological conditions of coal seams, evaluate the properties of coal seams, formulate mining plans, and ensure safe production.

[0003] For example, sampling gas in coal seams can monitor the gas concentration in mines, timely discover and deal with potential gas accumulation problems, effectively prevent accidents such as gas explosions, combustion, and suffocation, and improve the safety and stability of mines; for example, sampling coal can analyze coal samples to understand the quality status and physical properties of coal seams, so as to carry out targeted mining;

[0004] At present, the commonly used method is to drill and sample the coal seam through a coal mine drilling rig, that is, to select a suitable drilling position, set reasonable drilling parameters, and make the drill rod, drill bit 12, sampler and other equipment perform corresponding actions; but there are the following problems: 1. The action source of the drilling rig is mainly a diesel engine. Although it has the advantages of high efficiency, flexible use and strong reliability, it requires more auxiliary parts and is easy to cause pollution to the construction environment, especially the relatively closed environment underground; 2. In the sampling process, the drill tool needs to drill into the sampling point, and then the sampler and other equipment are sent to the sampling point to complete the sampling. This method not only leads to a long process time, but also has large losses and poor timeliness. For example, the accuracy of gas content and pressure cannot be guaranteed; 3. In the drilling process, in order to avoid a large amount of debris generated by drilling and increase the resistance of the drill bit 12 to drill, or even cause a stuck drill, the drill bit 12 needs to have a special structure or special equipment is set to remove slag from the drill tool. This method will increase the drilling cost. Summary of the invention

[0005] The object of the present invention is to provide an integrated drilling and sampling pneumatic drill based on a static pressure air source. The static pressure air source is used as the input source. While providing basic power, it is more environmentally friendly and can realize adjustment and switching of drilling slag removal, normal pressure air sampling, and pressurized air sampling. Sampling can be performed without withdrawing the drill rod, thereby effectively improving the drilling and sampling efficiency and avoiding the problems of long process time and poor timeliness.

[0006] To achieve the above-mentioned purpose, the present drilling and sampling integrated pneumatic drilling rig based on static pressure wind source comprises: drilling tool components and pneumatic system;

[0007] Drilling tool components, including a drill bit, a double-walled auger rod, and a dual-channel pigtail connected in sequence;

[0008] A drill bit having an axially penetrating through hole;

[0009] A double-walled spiral drill rod having inner and outer drill rods arranged coaxially, an outer channel formed between the inner and outer drill rods, and an inner drill rod having an inner channel communicating with the through hole;

[0010] The double-channel tail braid is provided with lateral ventilation holes communicating with the outer channel, and axial ventilation holes communicating with the inner channel;

[0011] The outer diameter of the drill bit is larger than the outer diameter of the double-wall spiral drill rod, and the double-wall spiral drill rod is provided with a jet hole connected to the outer channel near the drill bit;

[0012] The pneumatic system has an air inlet connected to the static pressure wind source of the coal mine, a first air outlet and a second air outlet that can be opened and closed, and a power component near the exhaust port, the power component can convert gas into hydraulic power and enable the drilling tool components to perform basic actions through the drilling rig hydraulic system;

[0013] Wherein, the first air outlet is communicated with the axial ventilation hole, and the second air outlet is communicated with the lateral ventilation hole.

[0014] In some examples of the present invention, the power component has an air motor and a hydraulic pump;

[0015] The output end of the air motor is connected to the hydraulic pump and the power is input into the hydraulic system of the drilling rig through the hydraulic pump.

[0016] In some examples of the present invention, the pneumatic system has a main branch, and a first branch, a second branch, and a fourth branch respectively connected to the main branch;

[0017] The main branch is connected to the coal mine static pressure wind source, the first air outlet is located at the end side of the first branch, the second air outlet is located at the end side of the second branch, and the power component is located on the fourth branch;

[0018] Among them, the main branch, the first branch, the second branch and the fourth branch are all controlled to open and close.

[0019] In some examples of the present invention, the pneumatic system further comprises a third branch whose opening and closing is controlled;

[0020] One end of the third branch is connected to the main branch, and the other end is connected to the second branch. The third branch is provided with a boost valve and a third one-way valve for gas to flow to the second gas outlet.

[0021] A second one-way valve is provided on the second branch line near the main branch line so that the gas flows toward the second gas outlet.

[0022] In some examples of the present invention, a pneumatic throttle valve is also provided on the fourth branch.

[0023] In some examples of the present invention, a first electromagnetic switch valve is provided on the first branch, a second electromagnetic switch valve is provided on the second branch, a third electromagnetic switch valve is provided on the third branch, and a fourth electromagnetic switch valve is provided on the fourth branch;

[0024] The first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve, and the fourth electromagnetic switch valve are all connected to the controller and controlled by it.

[0025] In some examples of the present invention, the main branch is provided with a main switch valve and a first one-way valve for airflow to flow to each branch.

[0026] In some examples of the present invention, the drill bit, the double-walled spiral drill rod, and the dual-channel pigtail in the drilling tool components are threadedly connected to each other;

[0027] The jet holes are arranged obliquely, and the outer ports face the drill bit.

[0028] The purpose of the present invention is to provide a control method for a drilling and sampling integrated pneumatic drill based on a static pressure air source. The pneumatic system is connected to the static pressure air source of the coal mine. While providing basic power, the overall weight is light and the environment is more environmentally friendly. The main branch is connected to the corresponding branch and the opening and closing are controlled so that the first air outlet is connected to the axial air vent, the second air outlet is connected to the lateral air vent, and the gas enters the second air outlet unidirectionally after being pressurized by the booster valve, thereby realizing the adjustment and switching of drilling slag discharge, normal pressure air sampling, and pressurized air sampling, effectively improving the drilling sampling efficiency, and avoiding the problems of long process time and poor timeliness.

[0029] The control method of the drilling and sampling integrated pneumatic drilling rig based on a static pressure air source specifically comprises the following steps:

[0030] S1, the static pressure air source of the coal mine is drawn out from the static pressure air duct of the coal mine and enters the pneumatic system;

[0031] When the drilling rig is positioned, the main branch is opened, the fourth branch is opened, and the gas motor is connected to the hydraulic pump to convert the gas into hydraulic power, and the drilling tool components perform basic actions through the drilling rig hydraulic system;

[0032] S2, when drilling, the first branch is opened, the second branch and the third branch are closed, and the gas from the static pressure air source enters the axial ventilation hole of the double-channel tail pigtail, the inner channel of the double-wall spiral drill rod, and finally is discharged from the through hole of the drill bit from back to front, completing the positive cycle drilling and slag removal;

[0033] S3, when sampling is performed, the second branch is opened, the first branch and the third branch are closed, and the gas from the static pressure wind source enters the lateral ventilation hole of the double-channel tail pigtail, the outer channel of the double-wall spiral drill rod, and the jet hole from the second outlet of the second branch into the borehole, and finally is discharged from the through hole of the drill bit from front to back, completing the reverse circulation sampling;

[0034] S4, when the wind pressure is low or the space on the inner wall of the borehole is small for pressurized wind sampling, the third branch is opened, and the first branch and the second branch are closed. The gas from the static pressure wind source is pressurized by the booster valve on the third branch and enters the second branch in one direction, and enters the lateral ventilation holes of the dual-channel tail pigtail, the outer channel of the double-wall spiral drill rod, and the jet hole from the second air outlet to enter the borehole, and finally is discharged from the through hole of the drill bit from front to back to complete the pressurized wind reverse circulation sampling.

[0035] Compared with the prior art, the present integrated drilling and sampling pneumatic drill based on static pressure wind source is connected to the static pressure wind source of the coal mine through the pneumatic system, which can make the overall weight light and has the advantages of green environmental protection while providing basic power for the pneumatic drill. On the other hand, the first air outlet is connected with the axial air vent, the inner channel and the drilling through hole, and the second air outlet is connected with the lateral air vent, the outer channel and the jet hole and the drilling through hole, so as to realize the sequential actions of drilling slag discharge and normal pressure wind sampling, and effectively improve the efficiency of the drilling rig.

[0036] Due to the provision of the third branch, when the third branch is opened and the second branch is closed, the gas is pressurized by the booster valve and then enters the second branch in a unidirectional manner, and enters the lateral ventilation holes, the external channel, the jet holes into the borehole from the second air outlet, and is finally discharged from the drill bit through hole from front to back, thereby realizing pressurized air reverse circulation sampling. The present invention connects the main branch with the corresponding branches and controls the opening and closing, thereby realizing the adjustment and switching of drilling slag discharge, normal pressure air sampling and pressurized air sampling, thereby effectively improving the drilling sampling efficiency and avoiding the problems of long process time and poor timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the pneumatic system in the present invention;

[0038] Figure 2 It is a structural schematic diagram of the drilling tool component in the present invention;

[0039] Figure 3 It is a schematic diagram of gas flow during drilling and deslagging operation of the drilling tool component of the present invention;

[0040] Figure 4 It is a schematic diagram of gas flow through the drilling tool component during sampling operation in the present invention;

[0041] In the figure: 1. Static pressure air source, 2. Main switch valve;

[0042] 3. a first one-way valve, 4. a first electromagnetic switch valve, 5. a first air outlet;

[0043] 6. second electromagnetic switch valve, 7. second one-way valve, 8. second air outlet;

[0044] 9. a third electromagnetic switch valve, 10. a booster valve, 11. a third one-way valve;

[0045] 12, drill bit, 121, through hole, 122, jet hole;

[0046] 13. Double-walled spiral drill rod, 131. outer channel, 132. inner channel;

[0047] 14. Dual-channel pigtail, 141. Lateral ventilation holes, 142. Axial ventilation holes;

[0048] 15. fourth electromagnetic switch valve, 16. pneumatic throttle valve, 17. air motor, 18. exhaust port, 19. connecting shaft;

[0049] 20. Oil tank, 21. Hydraulic pump. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] like Figure 1 , Figure 2 As shown, the drilling and sampling integrated pneumatic drilling rig based on static pressure wind source includes: drilling tool components and pneumatic system;

[0053] The drilling tool components include a drill bit 12, a double-walled spiral drill rod 13, and a dual-channel pigtail 14 connected in sequence;

[0054] The drill bit 12 is provided with a through hole 121 extending axially therethrough;

[0055] The double-walled spiral drill rod 13 has inner and outer drill rods arranged coaxially, an outer channel 131 is formed between the inner and outer drill rods, and the inner drill rod has an inner channel 132 connected to the through hole 121;

[0056] The dual-channel pigtail 14 is provided with a lateral ventilation hole 141 communicating with the outer channel 131 , and an axial ventilation hole 142 communicating with the inner channel 132 ;

[0057] The outer diameter of the drill bit 12 is larger than the outer diameter of the double-walled spiral drill rod 13, and the double-walled spiral drill rod 13 is provided with a jet hole 122 connected to the outer channel 131 near the drill bit 12;

[0058] The pneumatic system has an air inlet connected to the coal mine static pressure wind source 1, a first air outlet 5 and a second air outlet 8 that can be opened and closed, and a power component near the exhaust port 18. The power component can convert gas into hydraulic power and enable the drilling tool components to perform basic actions through the drilling rig hydraulic system;

[0059] The first air outlet 5 is in communication with the axial ventilation hole 142, and the second air outlet 8 is in communication with the lateral ventilation hole 141;

[0060] Specifically, the drill bit 12, the double-walled spiral drill rod 13, and the double-channel tail pigtail 14 in the drilling tool are threadedly connected to each other; the drill bit 12 is used for direct contact with the coal seam, and is coaxially provided with a through hole 121 passing therethrough, and the through hole 121 can facilitate drilling sampling and slag removal; the double-walled spiral drill rod 13 is an inner and outer drill rod arranged coaxially, and when the double-walled spiral drill rod 13 is coaxially installed with the drill bit 12, the inner channel 132 is relatively connected with the through hole 121, and the outer channel 131 is provided with a jet hole 122, preferably, the jet hole 122 is arranged obliquely, and the outer port faces the drill bit 12;

[0061] The outer diameter of the drill bit 12 is larger than the outer diameter of the double-walled spiral drill rod 13. On the one hand, it can avoid the double-walled spiral drill rod 13 from contacting the hole wall during drilling, thereby causing damage to the double-walled spiral drill rod 13. On the other hand, a certain annular channel exists between the double-walled spiral drill rod 13 and the hole wall, which facilitates the passage of airflow to achieve slag removal and sampling.

[0062] The dual-channel pigtail 14 is configured to facilitate sampling in the fields of geological exploration, coal seam sampling, etc. The dual-channel pigtail 14 may include a double-walled tube body, that is, the double-walled tube body is composed of an outer tube body and an inner tube body, and the channel between the two is closed at the rear side of the double-walled tube body, and a lateral ventilation hole 141 is provided on the outer tube body, and an axial ventilation hole 142 is provided on the rear side of the inner tube body; the outer tube body is connected to the outer drill rod, and the inner tube body is connected to the inner drill rod, so that the lateral ventilation hole 141 can enter the outer channel 131, and the axial ventilation hole 142 can enter the axial ventilation hole 142 and the inner channel 132;

[0063] The input end of the pneumatic system is connected to the static pressure air source 1 of the coal mine, that is, the static pressure air source 1 can enter the axial ventilation hole 142 through the first air outlet 5, enter the lateral ventilation hole 141 through the second air outlet 8, and convert the gas into hydraulic power through the power component to drive the drilling tool component to perform basic actions. It is explained that this basic action includes the rotation and drilling of the drilling tool component, and even the basic functions of the pneumatic drilling rig such as walking, positioning, and support, which has the advantages of green environmental protection and high efficiency;

[0064] When the pneumatic drilling rig based on static pressure air source for drilling and sampling is used, the static pressure air source 1 of the coal mine is drawn out from the static pressure air duct of the coal mine and enters the pneumatic system. After the pneumatic drilling rig is positioned, the pneumatic system first transmits the gas to the power component after receiving the control command. The gas of the power component is converted into hydraulic power and the pneumatic drilling rig is used to perform basic operations such as walking, rotating, feeding, and supporting through the drilling rig hydraulic system.

[0065] like Figure 3 As shown, when drilling is performed, the first air outlet 5 of the pneumatic system is opened and communicated with the axial ventilation hole 142 and the inner channel 132, and the second air outlet 8 is in a closed state, and the gas enters from the axial ventilation hole 142 and the inner channel 132, and is discharged from the through hole 121 from the back to the front, realizing positive cycle drilling and slag removal; it is explained that at this time, the slag removal gas can continue to be discharged from the inner wall of the borehole;

[0066] like Figure 4 As shown, when sampling is performed, the second air outlet 8 of the pneumatic system is opened and communicated with the lateral ventilation hole 141 and the external channel 131, and the first air outlet 5 is in a closed state, and the gas enters the borehole from the lateral ventilation hole 141, the external channel 131, and the jet hole 122, and is finally discharged from the through hole 121 of the drill bit 12 from front to back, realizing reverse circulation sampling;

[0067] On the one hand, this integrated drilling and sampling pneumatic drill based on static pressure air source is connected to the coal mine static pressure air source 1 through the pneumatic system. While providing basic power for the pneumatic drill, it can make the overall weight light and has the advantages of being green and environmentally friendly. On the other hand, through the mutual connection between the first air outlet 5 and the second air outlet 8, the drilling and slag discharge and normal pressure air sampling actions are realized in sequence, effectively improving the efficiency of the drilling rig.

[0068] In some examples of the present invention, Figure 1 As shown, the power component has an air motor 17 and a hydraulic pump 21;

[0069] The output end of the air motor 17 is connected to the hydraulic pump 21 and the power is input into the drilling rig hydraulic system through the hydraulic pump 21;

[0070] Specifically, the output end of the air motor 17 can be connected to the hydraulic pump 21 through the connecting shaft 19, and the hydraulic pump 21, the oil tank 20, and the drilling rig hydraulic system are connected to each other through an oil pipe;

[0071] When this example is in use, the air motor 17 can convert air pressure into rotational torque, and this torque power drives the hydraulic pump 21 to rotate, so that the oil tank 20 provides hydraulic power for the drilling rig hydraulic system.

[0072] In some examples of the present invention, Figure 1 As shown, the pneumatic system has a main branch, and a first branch, a second branch, and a fourth branch respectively connected to the main branch;

[0073] The main branch is connected to the coal mine static pressure wind source 1, the first air outlet 5 is located at the end side of the first branch, the second air outlet 8 is located at the end side of the second branch, and the power component is located on the fourth branch;

[0074] Among them, the main branch, the first branch, the second branch, and the fourth branch are all controlled to open and close;

[0075] Specifically, the first branch, the second branch, and the fourth branch are connected to the main branch respectively, and the main branch is equivalent to an integral opening and closing pipeline. The connection of the corresponding air outlet and the action of the power component are realized by controlling the connection of the corresponding branch, so as to facilitate the opening and closing control of the corresponding branch. In addition, the other end of the fourth branch is the exhaust port 18, and the first branch and the second branch can be opened and closed at the same time, but not opened at the same time.

[0076] Furthermore, a pneumatic throttle valve 16 is provided on the fourth branch;

[0077] Specifically, the pneumatic throttle valve 16 can adjust the fluid flow rate and pressure by controlling the gas flow and pressure. Its installation position is close to the main branch, and the gas flow and pressure are adjusted to ensure the efficient operation of the air motor 17.

[0078] In some examples of the present invention, Figure 1 As shown, the pneumatic system further includes a third branch whose opening and closing is controlled;

[0079] One end of the third branch is connected to the main branch, and the other end is connected to the second branch. The third branch is provided with a boost valve 10 and a third one-way valve 11 for gas to flow to the second gas outlet 8;

[0080] A second one-way valve 7 is provided on the second branch line near the main branch line so that the gas flows toward the second gas outlet 8;

[0081] Specifically, the third branch is configured for pressurized sampling;

[0082] When sampling normally, the third branch can be closed first, and the second branch can be opened. The gas enters the lateral ventilation holes 141, the external channel 131, and the jet holes 122 from the main branch and the second air outlet 8 at the end of the second branch to enter the interior of the borehole, and is finally discharged from the through hole 121 of the drill bit 12 from front to back. If the wind pressure is low or the space on the inner wall of the borehole is reduced and sampling from the through hole 121 of the drill bit 12 cannot be achieved, the third branch can be opened, the second branch can be closed, and the pneumatic booster valve 10 can be used at the same time. After being pressurized by the booster valve 10, the gas enters the second branch in one direction, and enters the lateral ventilation holes 141, the external channel 131, and the jet holes 122 from the second air outlet 8 to enter the interior of the borehole, and is finally discharged from the through hole 121 of the drill bit 12 from front to back, realizing pressurized wind reverse circulation sampling.

[0083] In some examples of the present invention, Figure 1 As shown, the first branch is provided with a first electromagnetic switch valve 4, the second branch is provided with a second electromagnetic switch valve 6, the third branch is provided with a third electromagnetic switch valve 9, and the fourth branch is provided with a fourth electromagnetic switch valve 15;

[0084] The first electromagnetic switch valve 4, the second electromagnetic switch valve 6, the third electromagnetic switch valve 9, and the fourth electromagnetic switch valve 15 are all connected to the controller and controlled by it;

[0085] Specifically, the controller can be the central control unit of the pneumatic drilling rig, which can be presented through a control panel and a display screen, and control the first solenoid switch valve 4, the second solenoid switch valve 6, the third solenoid switch valve 9, and the fourth solenoid switch valve 15 through automatic and manual buttons to correspondingly complete the opening and closing of the first branch, the second branch, the third branch, and the fourth branch, which is more convenient to operate and can complete the rapid switching of drilling slag discharge, normal pressure air sampling, and pressurized air sampling.

[0086] In some examples of the present invention, Figure 1 As shown, the main branch is provided with a main switch valve 2 and a first one-way valve 3 for airflow to each branch;

[0087] Specifically, the main switch valve 2 can be a handle switch valve, which can manually open and close the main branch.

[0088] The control method of the drilling and sampling integrated pneumatic drilling rig based on a static pressure wind source specifically comprises the following steps:

[0089] S1, the coal mine static pressure air source 1 is drawn out from the coal mine static pressure air duct and enters the pneumatic system;

[0090] When the drilling rig is positioned, the main branch is opened, the fourth branch is opened, and the gas motor 17 is connected to the hydraulic pump 21 to convert the gas into hydraulic power, and the drilling tool components perform basic actions through the drilling rig hydraulic system;

[0091] S2, when drilling, the first branch is opened, the second branch and the third branch are closed, and the gas of the static pressure air source 1 enters the axial ventilation hole 142 of the double-channel tail pigtail 14, the inner channel 132 of the double-wall spiral drill rod 13 from the first outlet 5 of the first branch, and finally is discharged from the through hole 121 of the drill bit 12 from the back to the front, completing the positive cycle drilling and deslagging;

[0092] S3, when sampling is performed, the second branch is opened, the first branch and the third branch are closed, and the gas of the static pressure wind source 1 enters the lateral ventilation hole 141 of the double-channel tail pigtail 14, the outer channel 131 of the double-wall spiral drill rod 13, and the jet hole 122 from the second outlet 8 of the second branch into the borehole, and finally is discharged from the through hole 121 of the drill bit 12 from front to back, completing the reverse circulation sampling;

[0093] S4, when the wind pressure is low or the space on the inner wall of the borehole is small for pressurized wind sampling, the third branch is opened, and the first branch and the second branch are closed. The gas from the static pressure wind source 1 is pressurized by the booster valve 10 on the third branch and enters the second branch in one direction, and enters the lateral ventilation hole 141 of the dual-channel tail pigtail 14, the outer channel 131 of the double-wall spiral drill rod 13, and the jet hole 122 from the second air outlet 8 to enter the inside of the borehole, and finally is discharged from the through hole 121 of the drill bit 12 from front to back, completing the pressurized wind reverse circulation sampling.

[0094] The exemplary implementation scheme of the integrated drilling and sampling pneumatic drill based on a static pressure wind source proposed in the present invention is described in detail above with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the protection scope of the present invention, which is determined by the attached claims.

Claims

1. A pneumatic drilling rig for drilling and sampling based on a static pressure wind source, characterized in that: include: Drilling tool components and pneumatic systems; The drilling tool components include a drill bit (12), a double-walled spiral drill rod (13), and a dual-channel tail pigtail (14) connected in sequence; A drill bit (12) provided with an axially penetrating through hole (121); A double-walled spiral drill rod (13) having inner and outer drill rods arranged coaxially, an outer channel (131) being formed between the inner and outer drill rods, and the inner drill rod having an inner channel (132) communicating with the through hole (121); The double-channel tail braid (14) is provided with a lateral ventilation hole (141) communicating with the outer channel (131), and an axial ventilation hole (142) communicating with the inner channel (132); The outer diameter of the drill bit (12) is larger than the outer diameter of the double-walled spiral drill rod (13), and the double-walled spiral drill rod (13) is provided with a jet hole (122) connected to the outer channel (131) near the drill bit (12); The pneumatic system comprises an air inlet connected to a coal mine static pressure air source (1), a first air outlet (5) and a second air outlet (8) capable of being opened and closed, and a power component near the exhaust port (18), wherein the power component is capable of converting gas into hydraulic power and enabling the drilling tool components to perform basic movements through the drilling rig hydraulic system; The first air outlet (5) is in communication with the axial ventilation hole (142), and the second air outlet (8) is in communication with the lateral ventilation hole (141); The power component comprises an air motor (17) and a hydraulic pump (21); The output end of the air motor (17) is connected to the hydraulic pump (21) and the power is input into the hydraulic system of the drilling rig through the hydraulic pump (21); The pneumatic system comprises a main branch, and a first branch, a second branch, and a fourth branch respectively connected to the main branch; The main branch is connected to the coal mine static pressure wind source (1), the first air outlet (5) is located at the end side of the first branch, the second air outlet (8) is located at the end side of the second branch, and the power component is located on the fourth branch; Among them, the main branch, the first branch, the second branch, and the fourth branch are all controlled to open and close; The pneumatic system also includes a third branch whose opening and closing is controlled; One end of the third branch is connected to the main branch, and the other end is connected to the second branch, and the third branch is provided with a boost valve (10) and a third one-way valve (11) for gas to flow to the second gas outlet (8); A second one-way valve (7) is provided on the second branch line near the main branch line, allowing gas to flow toward the second gas outlet (8).

2. The integrated drilling and sampling pneumatic drill based on static pressure wind source according to claim 1 is characterized in that: The fourth branch is also provided with a pneumatic throttle valve (16).

3. The integrated drilling and sampling pneumatic drill based on static pressure wind source according to claim 2 is characterized in that: The first branch is provided with a first electromagnetic switch valve (4), the second branch is provided with a second electromagnetic switch valve (6), the third branch is provided with a third electromagnetic switch valve (9), and the fourth branch is provided with a fourth electromagnetic switch valve (15); The first electromagnetic switch valve (4), the second electromagnetic switch valve (6), the third electromagnetic switch valve (9), and the fourth electromagnetic switch valve (15) are all connected to the controller and controlled by it.

4. The integrated drilling and sampling pneumatic drill based on static pressure wind source according to claim 3 is characterized in that: The main branch is provided with a main switch valve (2) and a first one-way valve (3) for the airflow to flow to each branch.

5. The integrated drilling and sampling pneumatic drill based on a static pressure wind source according to any one of claims 1 to 4, characterized in that: The drill bit (12), the double-walled spiral drill rod (13), and the double-channel pigtail (14) in the drilling tool components are threadedly connected to each other; The jet holes (122) are arranged obliquely, and the outer ports face the drill bit (12).

6. A control method for a drilling and sampling integrated pneumatic drill based on a static pressure wind source as claimed in claim 4, characterized in that: The specific steps include: S1, the coal mine static pressure air source (1) is drawn out from the coal mine static pressure air duct and enters the pneumatic system; When the drilling rig is positioned, the main branch is opened, the fourth branch is opened, and the gas motor (17) is connected to the hydraulic pump (21), so that the gas is converted into hydraulic power, and the drilling tool components are made to perform basic actions through the drilling rig hydraulic system; S2, when drilling is in progress, the first branch is opened, the second branch and the third branch are closed, and the gas from the static pressure air source (1) enters the axial ventilation hole (142) of the double-channel tail pigtail (14), the inner channel (132) of the double-wall spiral drill rod (13) from the first outlet (5) of the first branch, and finally is discharged from the through hole (121) of the drill bit (12) from the back to the front, completing the positive cycle drilling and slag removal; S3, when sampling is performed, the second branch is opened, the first branch and the third branch are closed, and the gas from the static pressure air source (1) enters the lateral ventilation hole (141) of the double-channel tail pigtail (14), the outer channel (131) of the double-wall spiral drill rod (13), the jet hole (122) into the borehole, and finally is discharged from the through hole (121) of the drill bit (12) from front to back, completing the reverse circulation sampling; S4, when the wind pressure is low or the space on the inner wall of the borehole is small, pressurized air sampling is performed. When performing pressurized air sampling, the third branch is opened, and the first branch and the second branch are closed. The gas from the static pressure air source (1) is pressurized by the booster valve (10) on the third branch and enters the second branch in one direction, and enters the lateral ventilation hole (141) of the double-channel tail braid (14), the outer channel (131) of the double-wall spiral drill rod (13), and the jet hole (122) from the second air outlet (8) to enter the borehole, and finally is discharged from the through hole (121) of the drill bit (12) from front to back, completing the pressurized air reverse circulation sampling.

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