A pressure relief device for drilling coal pillars along fault-shaped sections

Abstract

The present invention relates to the technical field of equipment for coal pillar drilling, and discloses a pressure relief device for coal pillar drilling along a fault-shaped section, comprising: a drilling rod, and also comprising: a support block, which is arranged below the drilling rod; a first connecting rod, which is fixedly connected to the upper surface of the support block; a second connecting rod, which is fixedly connected to the surface of the support block, and is annularly arranged in at least three groups; a rotating cylinder, which is rotatably connected to the surface of the second connecting rod; a first bevel gear, which is rotatably connected to the surface of the first connecting rod; and a second bevel gear, which is fixedly connected to the surface of the rotating cylinder; when the rotating cylinder rotates, it drives the sliding frame to rotate synchronously, so that when the sliding frame rotates, the cutting block on the surface contacts and cuts the coal rock mass, thereby drilling the coal rock mass; by setting multiple groups of connecting plates and multiple groups of cutting blocks, the coal rock mass can be cut and drilled from multiple aspects during cutting, which is convenient for drilling from weak points and improves the drilling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of equipment for coal pillar drilling, in particular to a pressure relief device for coal pillar drilling along a fault-shaped section. Background Art

[0002] Compared with shallow mining, the stress environment of coal and rock mass in deep mining is more complex. Due to high stress, strong mining disturbance and complex geological structure, the frequency and intensity of rock burst are significantly increased. At present, the research on rock burst has achieved rich results, but due to the "opacity" of underground coal and rock mass itself and the uncertainty of its stress environment, rock burst is still a difficult problem faced by coal and rock mass scientific and technological workers. In response to the above problems, many scholars have made great progress in the current research on comprehensive prevention and control of rock burst, providing guarantee for safe coal mining. Drilling pressure relief technology is an effective local active emergency measure for the prevention and control of rock burst in coal and rock mass. It can avoid high stress concentration and improve the medium properties of coal and rock mass to weaken the ability to accumulate elastic energy. The drilling pressure relief method in coal or coal rock mass is favored by coal and rock mass enterprises because of its high efficiency, low cost and good pressure relief effect.

[0003] However, the existing pressure relief devices still have certain shortcomings in field use, mainly manifested in the insufficient rigidity and low stability of the drill bit in the pressure relief device. When drilling deep coal and rock masses, the drill bit is only driven by the driving assembly to drill holes, and the drilling is performed by rotating and squeezing. When encountering some coal and rock masses with higher hardness, it takes a long time to continuously drill them, which is time-consuming and laborious to use. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pressure relief device for drilling coal pillars along fault-shaped sections, which is equipped with multiple groups of connecting plates and multiple groups of cutting blocks. During cutting, the coal rock mass can be cut and drilled from multiple aspects, which is convenient for drilling from weak points and improves the drilling efficiency. When the arranged cutting blocks come into contact with the coal rock mass, the support plate will drive the entire mass to move upward, so that the support plate drives the connecting plate to move upward, thereby squeezing the buffer spring. The buffer spring contracts due to elastic potential energy, thereby exerting an opposite thrust to push the connecting plate to reset, thereby playing the role of pressure relief and buffering for the connecting plate during cutting. The device solves the problem of insufficient rigidity and low stability of the drill bit in the pressure relief device. When drilling deep coal rock mass, since the drill bit only drives the drill bit to drill through a driving assembly and rotates and squeezes to drill, when encountering some coal rock masses with greater hardness, it takes a long time to continuously drill the holes, which is time-consuming and labor-intensive to use.

[0005] In order to achieve the above-mentioned multiple groups of connecting plates and multiple groups of cutting blocks, the coal rock mass can be cut and drilled from multiple aspects during cutting, which is convenient for drilling from weak points and improves the drilling efficiency. When the arranged cutting blocks contact the coal rock mass, the support plate will drive the whole to move upward, so that the support plate drives the connecting plate to move upward, thereby squeezing the buffer spring. The buffer spring shrinks due to elastic potential energy, thereby exerting an opposite thrust to push the connecting plate to reset, thereby achieving the purpose of pressure relief and buffering for the connecting plate during cutting. The present invention provides the following technical solutions: A pressure relief device for drilling coal pillars along fault-shaped sections, comprising: a drilling rod, and also comprising:

[0006] A support block, disposed below the drilling rod;

[0007] A first connecting rod, fixedly connected to the upper surface of the support block;

[0008] Second connecting rods, fixedly connected to the surface of the support block, and arranged in an annular manner in at least three groups;

[0009] The rotating cylinders are all rotatably connected to the surface of the second connecting rod;

[0010] A first bevel gear, rotatably connected to the surface of the first connecting rod;

[0011] The second bevel gears are fixedly connected to the surface of the rotating cylinder;

[0012] The first bevel gear and the second bevel gear are both meshed and connected;

[0013] The rotating discs are fixedly connected to the surface of the rotating cylinder and are located on one side of the second bevel gear;

[0014] The support plates are all arranged on one side of the rotating disk;

[0015] A connecting plate, arranged above the supporting block;

[0016] One side surface of the support plate is fixedly connected to the surface of the connection plate;

[0017] A rotating sleeve is fixedly connected to the upper surface of the first bevel gear, passes through the connecting plate and extends to the inside of the drilling rod;

[0018] A sliding frame, fixedly connected to the upper surface of the connecting plate and arranged in an annular manner around the center of the connecting plate;

[0019] The sliding frame is sleeved on the surface of the drilling rod, the second connecting rod is set in an inclined shape, and a plurality of cutting blocks are arranged in an annular manner on the surface of the rotating disk. The rotating sleeve is connected to the output end of the driving assembly, so as to drive the rotating sleeve to rotate. A driving shaft is fixedly connected to the lower surface of the first bevel gear, and the driving shaft is sleeved on the surface of the first connecting rod, and penetrates and extends to the bottom of the supporting block. A drill bit is fixedly connected to the lower end of the driving shaft. Since the single-stage transmission ratio of the first bevel gear and the second bevel gear can reach 6 and the maximum transmission ratio can reach 8, the transmission power can reach 3700 kilowatts and the circumferential speed can reach 40 meters per second. Most of the engines used in coal rock drilling rigs are 264 kilowatts. Therefore, the first bevel gear and the second bevel gear can be suitable for the transmission power of coal rock drilling rigs. Coal rock is divided into extremely hard coal seams 50>f>4.0, hard coal seams 4,0>f>3,0, and medium hard coal seams 3,0 according to hardness. >f>1,5, soft coal seam 1,5>f>0,8, extremely soft coal seam 0,8>f>0.5. This device is suitable for medium hard coal seam, soft coal seam and extremely soft coal seam.

[0020] Furthermore, the drilling rod is rotatably connected to the upper surface of the connecting disk, and a buffer spring is fixedly connected to the upper surface of the connecting disk, one end of the buffer spring is fixedly connected to the outer surface of the drilling rod, and a connecting turntable is sleeved on the surface of the rotating sleeve, and the connecting turntable is rotatably connected to the surface of the rotating sleeve, and a push rod is fixedly connected to the upper surface of the connecting turntable, and the push rod is symmetrically arranged in two left and right groups. When the rotating cylinder rotates, the sliding frame drives the sliding frame to rotate synchronously, so that when the sliding frame rotates, the cutting block on the surface contacts and cuts the coal rock mass, thereby drilling holes in it. By setting up multiple groups of connecting disks and multiple groups of cutting blocks, the coal rock mass can be cut and drilled from multiple aspects during cutting, which is convenient for drilling from weak points and improves the drilling efficiency.

[0021] Furthermore, a matching block is fixedly connected to the inner wall surface of the drilling rod, and the matching block is located on one side of the pushing rod. The pushing rod passes through and extends to the top of the matching block to play a guiding role.

[0022] Furthermore, a pressure relief layer is provided inside the drilling rod, and a sliding rod is fixedly connected between the inner walls of the drilling rod through the pressure relief layer. The sliding rod is symmetrically arranged in two left and right groups, and a pressure relief spring is sleeved on the surface of the sliding rod. A piston plate is slidably connected to the surface of the rotating sleeve, and the sliding rod penetrates the piston plate and is slidably connected to the inner wall of the drilling rod.

[0023] Furthermore, a water outlet is provided on the surface of the rotating sleeve and above the piston plate, and a mounting block is fixedly connected to the upper end of the rotating sleeve. A mounting groove is provided on the upper surface of the mounting block, and a plurality of water inlet holes are provided inside the mounting block and on the surface of the mounting groove. The water flow is driven by the water pump to be transported from the rotating sleeve to the inside of the drilled hole for flushing. At the same time, when the water flows, it will flow out from the water inlet holes on the surface of the rotating sleeve and accumulate on the surface of the piston plate. Due to the continuous impact of the water flow, the piston plate is pushed downward to squeeze the pressure relief spring. The pressure relief spring contracts due to elastic potential energy, thereby generating a reverse thrust force. When the water pump stops delivering water, the pressure relief spring pushes the piston plate back due to the elastic potential energy, thereby resetting the piston plate, thereby completing a flushing and relieving pressure at the same time. The elastic pressure of the pressure relief spring is set to 5N, and the water flow pressure can easily cause it to elastically deform.

[0024] Furthermore, a driving motor is arranged above the rotating sleeve, and the output end of the driving motor is fixedly connected to a docking rod, and the lower end of the docking rod is fixedly connected to a docking block that matches the mounting block. The docking rod fixedly connected to the output end of the driving motor is inserted into the mounting groove inside the mounting block through the docking block. Then the staff connects the driving motor to a power source, moves the device to the location where drilling is required, starts the driving motor, and the output end of the driving motor drives the docking rod to rotate. The docking rod drives the mounting block to rotate through the docking block, which can realize the extension of the rotating sleeve and facilitate the extension of the drilling depth.

[0025] Furthermore, a pressure relief rod is fixedly connected between the inner walls of the drilling rod via a pressure relief layer, a reset spring is fixedly connected to the upper surface of the inner wall of the drilling rod, the reset spring is sleeved on the surface of the pressure relief rod, and a push plate is sleeved on the surface of the rotating sleeve.

[0026] Furthermore, the pressure relief rod passes through the surface of the push plate, the push rod is located below the reset spring, the reset spring is fixedly connected to the upper surface of the push plate, a water outlet is provided on the surface of the rotating sleeve and below the push plate, the elastic pressure of the reset spring is set to 5N, and the water flow pressure can easily cause it to undergo elastic deformation.

[0027] Compared with the prior art, the present invention provides a pressure relief device for drilling coal pillars along fault-shaped sections, which has the following beneficial effects:

[0028] 1. The pressure relief device for drilling coal pillars along fault-shaped sections drives the first bevel gear to rotate when the rotating sleeve is rotated. The first bevel gear rotates at one end of the first connecting rod. When the first bevel gear rotates, it meshes with the second bevel gear, so that it drives the second bevel gear to rotate synchronously when it rotates. The second bevel gear rotates on the surface of the second connecting rod through the rotating cylinder. When the rotating cylinder rotates, it drives the sliding frame to rotate synchronously, so that when the sliding frame rotates, the cutting block on the surface contacts and cuts the coal and rock mass, thereby drilling the coal and rock mass. By setting multiple groups of connecting plates and multiple groups of cutting blocks, the coal and rock mass can be cut and drilled from multiple aspects during cutting, which is convenient for drilling from weak points and improves the drilling efficiency.

[0029] 2. The pressure relief device for drilling coal pillars along fault-shaped sections is configured such that a docking rod fixedly connected to the output end of a driving motor is inserted into the mounting groove inside the mounting block through a docking block. Subsequently, the staff connects the driving motor to a power source, moves the device to the location where a hole needs to be drilled, starts the driving motor, and the output end of the driving motor drives the docking rod to rotate. The docking rod drives the mounting block to rotate through the docking block, which can extend the rotating sleeve and facilitate the extension of the drilling depth. When the provided cutting block contacts the coal rock mass, the support plate drives the entirety to move upward, so that the support plate drives the connecting plate to move upward, thereby squeezing the buffer spring, and the buffer The spring contracts due to elastic potential energy, thereby applying an opposite thrust to push the connecting disk to reset, thereby playing a role in pressure relief and buffering the connecting disk during cutting. The water pump drives the water flow from the rotating sleeve to the inside of the borehole for flushing. At the same time, when the water flows, it will flow out from the water inlet hole on the surface of the rotating sleeve and accumulate on the surface of the piston plate. Due to the continuous impact of the water flow, the piston plate is pushed downward to squeeze the pressure relief spring. The pressure relief spring contracts due to elastic potential energy, thereby generating a reverse thrust force. When the water pump stops delivering water, the pressure relief spring pushes the piston plate back due to elastic potential energy, thereby resetting the piston plate, thereby completing a flushing and relieving pressure at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a pressure relief device for drilling coal pillars along fault-shaped sections according to the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of a drilling rod of a pressure relief device for drilling a coal pillar in a fault-shaped section according to the present invention;

[0032] Figure 3 This invention is a kind of coal pillar drilling pressure relief device along the fault special section Figure 2 A schematic diagram of the structure enlargement in the middle;

[0033] Figure 4 It is a schematic diagram of the structure of a rotating disk of a pressure relief device for drilling coal pillars along a fault-shaped section according to the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of a support block of a pressure relief device for drilling a coal pillar in a fault-shaped section according to the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of a pressure relief layer of a pressure relief device for drilling a coal pillar in a fault-shaped section according to the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of an installation block for a pressure relief device for drilling a coal pillar along a fault-shaped section according to the present invention;

[0037] Figure 8 The present invention is a schematic structural diagram of a replaceable embodiment of a coal pillar drilling pressure relief device along a fault-shaped section.

[0038] In the figure: 1, drilling rod; 2, supporting block; 3, driving shaft; 4, second connecting rod; 5, rotating cylinder; 6, first bevel gear; 7, second bevel gear; 8, rotating disk; 9, supporting plate; 10, pushing plate; 11, connecting disk; 12, rotating sleeve; 13, sliding frame; 14, cutting block; 15, buffer spring; 16, connecting turntable; 17, pushing rod; 18, matching block; 19, pressure relief layer; 20, sliding rod; 21, pressure relief spring; 22, piston plate; 23, mounting block; 24, mounting groove; 25, driving motor; 26, docking rod; 27, pressure relief rod; 28, reset spring; 29, drill bit. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0040] For specific embodiment 1, please refer to Figure 1-7 , a pressure relief device for drilling coal pillars along fault-shaped sections, comprising: a drilling rod 1, and also comprising:

[0041] A support block 2 is arranged below the drilling rod 1;

[0042] A first connecting rod, fixedly connected to the upper surface of the supporting block 2;

[0043] The second connecting rods 4 are fixedly connected to the surface of the supporting block 2, and are arranged in at least three groups in an annular shape;

[0044] The rotating cylinder 5 is rotatably connected to the surface of the second connecting rod 4;

[0045] A first bevel gear 6, rotatably connected to the surface of the first connecting rod;

[0046] The second bevel gears 7 are fixedly connected to the surface of the rotating cylinder 5;

[0047] The first bevel gear 6 and the second bevel gear 7 are meshed and connected;

[0048] The rotating disc 8 is fixedly connected to the surface of the rotating cylinder 5 and is located on one side of the second bevel gear 7;

[0049] The support plates 9 are all arranged on one side of the rotating disk 8;

[0050] A connecting plate 11 is arranged above the supporting block 2;

[0051] One side surface of the support plate 9 is fixedly connected to the surface of the connection plate 11;

[0052] The rotating sleeve 12 is fixedly connected to the upper surface of the first bevel gear 6, passes through the connecting plate 11 and extends to the inside of the drilling rod 1;

[0053] The sliding frame 13 is fixedly connected to the upper surface of the connecting plate 11 and is arranged in a ring shape around the center of the connecting plate 11;

[0054] The sliding frame 13 is sleeved on the surface of the drilling rod 1, the second connecting rod 4 is set in an inclined shape, and a plurality of cutting blocks 14 are arranged in an annular manner on the surface of the rotating disk 8. The rotating sleeve 12 is connected to the output end of the driving assembly, thereby driving the rotating sleeve 12 to rotate. The lower surface of the first bevel gear 6 is fixedly connected to the driving shaft 3, which is sleeved on the surface of the first connecting rod and penetrates and extends to the bottom of the supporting block 2. The lower end of the driving shaft 3 is fixedly connected to the drill bit 29;

[0055] The drilling rod 1 is rotatably connected to the upper surface of the connecting disk 11, and a buffer spring 15 is fixedly connected to the upper surface of the connecting disk 11. One end of the buffer spring 15 is fixedly connected to the outer surface of the drilling rod 1. A connecting turntable 16 is sleeved on the surface of the rotating sleeve 12. The connecting turntable 16 is rotatably connected to the surface of the rotating sleeve 12. A push rod 17 is fixedly connected to the upper surface of the connecting turntable 16. The push rod 17 is symmetrically arranged in two groups on the left and right. A matching block 18 is fixedly connected to the inner wall surface of the drilling rod 1. The matching block 18 is located on one side of the push rod 17. The push rod 17 penetrates and extends to the top of the matching block 18. A pressure relief layer 19 is opened inside the drilling rod 1. A sliding rod 20 is fixedly connected between the inner walls of the drilling rod 1 through the pressure relief layer 19. The movable rod 20 is symmetrically arranged in two groups on the left and right, and a pressure relief spring 21 is sleeved on the surface of the sliding rod 20. A piston plate 22 is slidably connected to the surface of the rotating sleeve 12. The sliding rod 20 penetrates the piston plate 22 and is slidably connected to the inner wall of the drilling rod 1. A water outlet is provided on the surface of the rotating sleeve 12 and above the piston plate 22. A mounting block 23 is fixedly connected to the upper end of the rotating sleeve 12, and a mounting groove 24 is provided on the upper surface of the mounting block 23. A plurality of water inlet holes are provided inside the mounting block 23 and on the surface located at the mounting groove 24. A driving motor 25 is arranged above the rotating sleeve 12, and a docking rod 26 is fixedly connected to the output end of the driving motor 25, and a docking block matching the mounting block 23 is fixedly connected to the lower end of the docking rod 26.

[0056] For alternative specific embodiment 2, please refer to Figure 1-8 A pressure relief rod 27 is fixedly connected between the inner walls of the drilling rod 1 through a pressure relief layer 19, and a reset spring 28 is fixedly connected to the upper surface of the inner wall of the drilling rod 1. The reset spring 28 is sleeved on the surface of the pressure relief rod 27, and a push plate 10 is sleeved on the surface of the rotating sleeve 12. The pressure relief rod 27 passes through the surface of the push plate 10, and the push rod 17 is located below the reset spring 28. The reset spring 28 is fixedly connected to the upper surface of the push plate 10, and a water outlet is opened on the surface of the rotating sleeve 12 and below the push plate 10. When the water pump conveys water to the rotating sleeve 12, the water flows into the inside of the drilling rod 1 through the water outlet, and the push plate 10 is pushed upward by the impact of the water flow, so that the push plate 10 moves upward and squeezes the reset spring 28. The reset spring 28 contracts due to elastic potential energy. When the water flow stops, the reset spring 28 drives the push plate 10 to reset, thereby pushing the pressure and discharging it from the bottom of the device, thereby releasing the pressure.

[0057] Working principle: The staff aligns the docking rod 26 fixedly connected to the output end of the driving motor 25 with the mounting groove 24 through the square shape of the docking block, and then moves the driving motor 25 downward, so that the docking rod 26 is inserted into the mounting groove 24 inside the mounting block 23 due to the downward stress. Then the staff connects the driving motor 25 to the power supply, moves the device to the location where the hole needs to be drilled, starts the driving motor 25, and the output end of the driving motor 25 drives the docking rod 26 to rotate. The docking rod 26 drives the mounting block 23 to rotate through the docking block. When the mounting block 23 rotates, the mounting block 23 drives the rotating sleeve 12 to rotate. When the rotating sleeve 12 rotates When the first bevel gear 6 is rotated, the first bevel gear 6 rotates at one end of the first connecting rod. When the first bevel gear 6 rotates, it meshes with the second bevel gear 7, so that it drives the second bevel gear 7 to rotate synchronously when it rotates. The second bevel gear 7 rotates on the surface of the second connecting rod 4 through the rotating cylinder 5. When the rotating cylinder 5 rotates, it drives the rotating disk 8 to rotate synchronously, so that when the rotating disk 8 rotates, the cutting block 14 on the surface contacts and cuts the coal rock mass. The coal rock mass is cut and crushed by three groups of rotating disks 8, and large pieces of coal rock mass are cut and destroyed into small pieces of coal rock mass, thereby having a drilling effect on it. At the same time, when the first bevel gear 6 rotates, it drives the second bevel gear 7 to rotate synchronously with the second connecting rod 4 through the driving shaft 3. The drill bit 29 rotates synchronously to break the coal and rock mass. At the same time, when the cutting block 14 contacts the coal and rock mass, the support plate 9 will drive the entire body to move upward, so that the support plate 9 drives the connecting plate 11 to move upward, thereby squeezing the buffer spring 15. The buffer spring 15 contracts due to elastic potential energy, thereby exerting an opposite thrust to push the connecting plate 11 to reset, thereby playing a role in pressure relief and buffering the connecting plate 11 during cutting. When it is necessary to extend the installation of the rotating sleeve 12, it is only necessary to take the rotating sleeve 12 of the same model and dock its mounting block 23, and then re-install and dock it with the docking block at the lower end of the docking rod 26 of the drive motor 25. At the same time, when it is necessary to drill the hole When cleaning and removing sand, the staff only needs to connect the connecting water pipe to the rotating sleeve 12, and then start the water pump. The water pump drives the water flow from the rotating sleeve 12 to the inside of the borehole for flushing. At the same time, when the water flows, it will flow out from the water inlet hole on the surface of the rotating sleeve 12 to the inside of the drilling rod 1, and accumulate on the surface of the piston plate 22. Due to the continuous input of water flow, the piston plate 22 is pushed downward to squeeze the pressure relief spring 21. The pressure relief spring 21 contracts due to elastic potential energy, thereby generating a reverse thrust force. When the water pump stops delivering water, the pressure relief spring 21 pushes the piston plate 22 back due to elastic potential energy, so that the piston plate 22 is reset, thereby completing a flushing and relieving pressure at the same time.

[0058] In summary, the pressure relief device for drilling coal pillars along fault-shaped sections drives the first bevel gear 6 to rotate when the rotating sleeve 12 is rotated, and the first bevel gear 6 rotates at one end of the first connecting rod. When the first bevel gear 6 rotates, it meshes with the second bevel gear 7, so that it drives the second bevel gear 7 to rotate synchronously when it rotates. The second bevel gear 7 rotates on the surface of the second connecting rod 4 through the rotating cylinder 5. When the rotating cylinder 5 rotates, it drives the rotating disk 8 to rotate synchronously, so that when the rotating disk 8 rotates, it contacts the coal and rock through the cutting block 14 on the surface. The body is contacted and cut, so as to drill a hole in it. By setting up multiple groups of connecting disks 11 and multiple groups of cutting blocks 14, the coal rock body can be cut and drilled from multiple aspects during cutting, which is convenient for drilling from weak points and improves the drilling efficiency. The docking rod 26 fixedly connected to the output end of the driving motor 25 is inserted into the mounting groove 24 inside the mounting block 23 through the docking block. Then, after the staff connects the driving motor 25 to the power supply, the device is moved to the location where the hole needs to be drilled, and the driving motor 25 is started. The output end of the driving motor 25 drives the docking rod 26 to rotate, and the docking rod 26 drives the mounting block 23 to rotate through the docking block, which can realize the extension of the rotating sleeve 12, and is convenient for extending the drilling depth. When the cutting block 14 is in contact with the coal rock body, the support plate 9 will drive the whole to move upward, so that the support plate 9 drives the connecting disk 11 to move upward, thereby squeezing the buffer spring 15. The buffer spring 15 contracts due to the elastic potential energy, thereby exerting an opposite thrust to push the connecting disk 11 to reset, thereby playing a role in pressure relief and buffering of the connecting disk 11 during cutting. The water pump drives the water flow from the rotating sleeve 12 to the inside of the borehole for flushing. At the same time, when the water flows, it will flow out from the water inlet hole on the surface of the rotating sleeve 12 and accumulate on the surface of the piston plate 22. Due to the continuous impact of the water flow, the piston plate 22 is pushed downward to squeeze the pressure relief spring 21. The pressure relief spring 21 contracts due to elastic potential energy, thereby generating a reverse thrust force. When the water pump stops delivering water, the pressure relief spring 21 pushes the piston plate 22 back due to elastic potential energy, thereby resetting the piston plate 22, thereby completing a flushing and relieving pressure at the same time.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure relief device for drilling coal pillars along fault-shaped sections, comprising: The drilling rod (1) is characterized in that: A support block (2) is arranged below the drilling rod (1); A first connecting rod, fixedly connected to the upper surface of the support block (2); Second connecting rods (4) are fixedly connected to the surface of the support block (2), and are arranged in an annular shape in at least three groups; The rotating cylinder (5) is rotatably connected to the surface of the second connecting rod (4); A first bevel gear (6) rotatably connected to the surface of the first connecting rod; The second bevel gears (7) are fixedly connected to the surface of the rotating cylinder (5); The first bevel gear (6) and the second bevel gear (7) are both meshingly connected; The rotating discs (8) are fixedly connected to the surface of the rotating cylinder (5) and are located on one side of the second bevel gear (7); The support plates (9) are all arranged on one side of the rotating disk (8); A connecting plate (11) is arranged above the supporting block (2); One side surface of the support plate (9) is fixedly connected to the surface of the connection plate (11); A rotating sleeve (12) is fixedly connected to the upper surface of the first bevel gear (6), passes through the connecting plate (11) and extends into the interior of the drilling rod (1); A sliding frame (13) fixedly connected to the upper surface of the connecting plate (11) and arranged in a ring shape around the center of the connecting plate (11); The sliding frame (13) is sleeved on the surface of the drilling rod (1), the second connecting rod (4) is arranged in an inclined shape, a plurality of cutting blocks (14) are arranged in an annular shape on the surface of the rotating disk (8), the rotating sleeve (12) is connected to the output end of the driving component, so as to drive the rotating sleeve (12) to rotate, the lower surface of the first bevel gear (6) is fixedly connected to a driving shaft (3), the driving shaft (3) is sleeved on the surface of the first connecting rod, and penetrates and extends to the bottom of the supporting block (2), and the lower end of the driving shaft (3) is fixedly connected to a drill bit (29); A pressure relief rod (27) is fixedly connected between the inner walls of the drilling rod (1) via a pressure relief layer (19); a return spring (28) is fixedly connected to the upper surface of the inner wall of the drilling rod (1); the return spring (28) is sleeved on the surface of the pressure relief rod (27); and a push plate (10) is sleeved on the surface of the rotating sleeve (12); The pressure relief rod (27) penetrates the surface of the push plate (10), the push rod (17) is located below the reset spring (28), the reset spring (28) is fixedly connected to the upper surface of the push plate (10), and a water outlet is provided on the surface of the rotating sleeve (12) and below the push plate (10); The drilling rod (1) is rotatably connected to the upper surface of the connecting disk (11); a buffer spring (15) is fixedly connected to the upper surface of the connecting disk (11); one end of the buffer spring (15) is fixedly connected to the outer surface of the drilling rod (1); a connecting turntable (16) is sleeved on the surface of the rotating sleeve (12); the connecting turntable (16) is rotatably connected to the surface of the rotating sleeve (12); a push rod (17) is fixedly connected to the upper surface of the connecting turntable (16); and the push rod (17) is symmetrically arranged in two groups on the left and right.

2. A pressure relief device for drilling coal pillars along fault-shaped sections according to claim 1, characterized in that: A matching block (18) is fixedly connected to the inner wall surface of the drilling rod (1); the matching block (18) is located on one side of the pushing rod (17); the pushing rod (17) penetrates and extends to the top of the matching block (18).

3. The device for decompressing coal pillars along fault-shaped sections according to claim 1 is characterized in that: A pressure relief layer (19) is provided inside the drilling rod (1), and a sliding rod (20) is fixedly connected between the inner walls of the drilling rod (1) via the pressure relief layer (19). The sliding rod (20) is symmetrically arranged in two groups on the left and right. A pressure relief spring (21) is sleeved on the surface of the sliding rod (20). A piston plate (22) is slidably connected to the surface of the rotating sleeve (12). The sliding rod (20) passes through the piston plate (22) and is slidably connected to the inner wall of the drilling rod (1).

4. A pressure relief device for drilling coal pillars along fault-shaped sections according to claim 3, characterized in that: A water outlet hole is provided on the surface of the rotating sleeve (12) and located above the piston plate (22); a mounting block (23) is fixedly connected to the upper end of the rotating sleeve (12); a mounting groove (24) is provided on the upper surface of the mounting block (23); and a plurality of water inlet holes are provided inside the mounting block (23) and on the surface located at the mounting groove (24).

5. The device for decompressing coal pillars along fault-shaped sections according to claim 1, characterized in that: A driving motor (25) is arranged above the rotating sleeve (12); an output end of the driving motor (25) is fixedly connected to a docking rod (26); and a lower end of the docking rod (26) is fixedly connected to a docking block that matches the mounting block (23).

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