Static blasting hole enlarging, explosive feeding and hole sealing device and working method thereof

Abstract

The application discloses a static blasting reaming medicine feeding and hole sealing device and a working method thereof, and comprises a hole sealing device, a reaming device and a medicine feeding device; the reaming device is used for reaming an upward drilling hole and forming an annular cutting groove; the medicine feeding device is used for feeding medicine and pre-sealing the drilling hole; the medicine feeding device enters the drilling hole along with the reaming device first, and is moved to a position where the reaming device is located when reaming after the reaming work of the reaming device is completed, and is expanded into the annular cutting groove through two supporting rods, so that the medicine feeding device is fixed in the drilling hole; then the static breaking medicine roll is pushed into the drilling hole through the medicine feeding device by a medicine feeding shovel, finally, the hole sealing device is connected with the medicine feeding device, the hole sealing device seals the drilling hole mouth, a double sealing effect is formed, the static breaking medicine roll in the drilling hole generates continuous expansion stress and thermal stress through its own chemical reaction, and finally the hard roof of the coal seam is efficiently weakened and cracked.

Description

TECHNICAL FIELD

[0001] The present application relates to a static blasting reaming, medicine feeding and hole sealing device and its working method, belonging to the technical field of coal mine underground drilling reaming, medicine feeding, hole sealing and hard roof strata efficient cracking, suitable for operation in the drilling in the area where the roof pressure power phenomenon is more serious and the drilling "jetting hole" phenomenon is more. BACKGROUND

[0002] Most of the coal seam roof in China is hard and dense rock, with high strength, strong self-bearing capacity and high integrity. After coal mining, a large area of suspended roof is easily formed above the goaf, which is difficult to collapse naturally in a short time. When the roof high pressure exceeds the support strength limit, the suspended roof shearing failure occurs, causing roof pressure accidents. The large area collapse of the hard roof in the goaf not only easily induces dynamic impact disasters such as rock burst and underground tornado, but also easily forms gas accidents. In order to avoid the occurrence of the above disasters, artificial cracking measures such as static blasting technology are needed to forcibly release the roof, damage the integrity, and reduce the length and weight of the roof cantilever. However, static blasting has the problems of easy "jetting hole" and long cracking time in application, which seriously affects the construction safety and efficiency.

[0003] After the ordinary upward drilling construction from the roadway to the hard roof, due to the small space in the hole, the small number of filled cartridges, the smooth inner wall of the drilling, and the lack of free surface, it is difficult to place more static breaking cartridges in the drilling. At the same time, the common hole sealing method used in coal mine has poor sealing effect. When the axial stress generated by the static breaking cartridge hydration reaction is greater than the friction between the static cartridge and the hole wall, the "jetting hole" phenomenon occurs. The ejected cartridge is easy to scald the workers, and after the "jetting hole" phenomenon occurs, the expansion pressure and heat generated by the static breaking cartridge cannot fully act on the hole wall around the drilling, so the efficient weakening and cracking of the hard roof cannot be realized. Therefore, how to provide a device that not only increases the internal space of the upward drilling and increases the free surface, but also effectively seals the upward drilling, so as to fully utilize the continuous expansion stress and thermal stress generated by the chemical reaction of the static breaking cartridge itself, and finally realize the efficient weakening and cracking of the hard roof of the coal seam, is one of the research directions in the industry. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a static blasting reaming, medicine feeding and hole sealing device and its working method, which not only increases the internal space of the upward drilling and increases the free surface, but also effectively seals the upward drilling, so as to fully utilize the continuous expansion stress and thermal stress generated by the chemical reaction of the static breaking cartridge itself, and finally realize the efficient weakening and cracking of the hard roof of the coal seam.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a static blasting reaming medicine feeding and hole sealing device, comprising a hole sealing device, a reaming device and a medicine feeding device;

[0006] The reaming device comprises a reset spring, a shell, a pushing rod, a positioning pin shaft, a rotating pin shaft and a slotting drill bit. The shell is a cylinder with one end open and the other end blocked. A through slot is formed in the side of the shell. The pushing rod is provided with a threaded groove at one end and extends into the shell from the open end of the shell at the other end. The pushing rod can slide in the shell along the axial direction. The slotting drill bit is hinged to the other end of the pushing rod through the rotating pin shaft, so that the slotting drill bit can rotate relative to the pushing rod with the rotating pin shaft as the center and extend out of the shell from the through slot. The rotating pin shaft is provided with a clamping spring for limiting the axial movement of the rotating pin shaft. The slotting drill bit is provided with a strip-shaped limiting hole. There are two positioning pin shafts, both of which are inside the shell and fixedly connected to the shell at both ends. One of the positioning pin shafts passes through the strip-shaped limiting hole, and the other positioning pin shaft is above the slotting drill bit. The pushing rod can position the angle of the slotting drill bit extending out of the through slot when the pushing rod slides in the shell along the axial direction. The reset spring is sleeved outside the pushing rod, with one end fixedly connected to the threaded groove end of the pushing rod and the other end fixedly connected to the open end of the shell.

[0007] The medicine feeding device comprises a first connecting piece, a cylindrical sleeve, a center rod, a second connecting piece, connecting rods, a tension spring and support rods, the center rod is between the first connecting piece and the second connecting piece, and the first connecting piece, the center rod and the second connecting piece are coaxial in sequence and are connected by threads; the first connecting piece, the center rod and the second connecting piece are internally provided with central through holes, and the three central through holes form a hollow cylindrical cavity; the cylindrical sleeve is sleeved on the outside of the center rod and can slide on the center rod in the axial direction; the two sides of the cylindrical sleeve are symmetrically fixed with rectangular lugs, the two sides of the second connecting piece are symmetrically fixed with fan-shaped lugs, one end of each of the two support rods is hingedly connected with a fan-shaped lug through a pin, one end of each of the two connecting rods is hingedly connected with a rectangular lug, and the other end of each of the two connecting rods is hingedly connected with the side of a support rod; the two sides of the second connecting piece are symmetrically fixed with compression springs, one end of each of the two compression springs is fixedly connected with the two sides of the second connecting piece, and the other end of each of the two compression springs is fixedly connected with the side of a connecting rod; the two compression springs respectively apply elastic force to the two connecting rods, so that the two connecting rods expand towards the two sides of the second connecting piece, thereby driving the two support rods to expand towards the two sides and simultaneously driving the cylindrical sleeve to slide on the center rod towards the second connecting piece; the inner wall of the cylindrical sleeve is embedded with an arc-shaped elastic steel sheet, the outside of the center rod is provided with a positioning buckle, and when the arc-shaped elastic steel sheet contacts the positioning buckle during the sliding of the cylindrical sleeve on the center rod, the arc-shaped elastic steel sheet and the positioning buckle are mutually clamped, so as to position the sliding position of the cylindrical sleeve on the center rod and limit the expansion angle of the two support rods; the tension spring is two, one end of each of the two tension springs is fixedly connected with a rectangular lug, and the other end of each of the two tension springs is in the shape of a hook; the other end of the support rod is in the shape of a chamfered structure.

[0008] The hole sealing device is a disc plug, the disc plug is provided with a threaded connecting column in the center, the disc plug is threadedly connected with the threaded groove of the pushing rod through the threaded connecting column, the disc plug is provided with two connecting rings, one end of each of the two tension springs is detachably connected with a connecting ring, so that the two tension springs are in a tension state.

[0009] Further, the device further comprises a medicine feeding shovel and a telescopic pushing rod, the medicine feeding shovel is in a hollow rod structure, and one end of the telescopic pushing rod extends into the inside of the medicine feeding shovel and can slide in the inside of the medicine feeding shovel; the outer diameter of the medicine feeding shovel is smaller than the inner diameter of the hollow cylindrical cavity, and the inner diameter of the medicine feeding shovel is larger than the outer diameter of the telescopic pushing rod. The device can conveniently put the static broken cartridge into the borehole.

[0010] Further, one end of the telescopic pushing rod is provided with an antiskid rubber pad. The structure can increase the contact friction force between the telescopic pushing rod and the medicine feeding shovel and the contact area between the telescopic pushing rod and the static broken cartridge, so as to ensure that the static broken cartridge can be pushed to the required position.

[0011] Further, the elastic potential energy of the tensile spring in the stretched state is greater than the elastic potential energy of the compression spring in the compressed state. In this way, it can be ensured that the two support rods will not be in an expanded state when the tensile spring is stretched, facilitating the placement of the device into the borehole.

[0012] The working method of the static blasting hole expanding, medicine feeding and hole sealing device is specifically as follows:

[0013] A. After the upward drilling work is completed, the hole sealing device, the hole expanding device and the medicine feeding device are assembled into the static blasting hole expanding, medicine feeding and hole sealing device in sequence, at this time, the tensile spring is in the stretched state, and the two support rods are in the closed state, then the medicine feeding device is placed into the borehole from one end of the medicine feeding device until the disc plug contacts the bottom of the borehole or the disc plug in the hole sealing device contacts the borehole orifice, at this time, the disc plug is separated from the tensile spring and removed from the borehole orifice, at this time, the tensile spring resets, the tensile force of the tensile spring on the cylindrical sleeve disappears, the two compression springs respectively exert elastic force on the two connecting rods, the two connecting rods expand towards the two sides of the second connecting piece, and then drive the two support rods to expand towards the two sides, and drive the cylindrical sleeve to slide on the center rod towards the second connecting piece; until the other ends of the two support rods respectively contact the inner wall of the borehole, the expansion of the two support rods is stopped;

[0014] B. The drill and the advancing rod of the hole expanding device are coaxially connected, the drill drives the advancing rod to rotate and press the advancing rod in the direction of the borehole, at this time, the advancing rod moves in the shell towards the bottom of the borehole, in the moving process, the slotting drill bit is limited by the two positioning pins to make one end of the slotting drill bit extend out of the shell to press and expand the inner wall of the borehole, and the reset spring continuously compresses to increase the elastic potential energy; until the slotting drill bit reaches the maximum limiting angle, then the drill keeps rotating and stops pressing and moves towards the borehole orifice, at this time, the reset spring exerts elastic force on the advancing rod, so that the advancing rod moves towards the borehole orifice with the drill, the reset spring gradually resets, and the slotting drill bit retracts into the shell until it returns to the initial position, thereby realizing the expansion of the borehole around the hole expanding device and forming an annular slot;

[0015] C. After the hole expanding work is completed, the entire static blasting hole expanding, medicine feeding and hole sealing device is moved towards the borehole orifice by the drill, since the other ends of the two support rods are chamfered structures, they can slide relative to the inner wall of the borehole when the medicine feeding device moves under force, until the medicine feeding device reaches the position where the hole expanding device expands the hole, the other ends of the two support rods enter the annular slot, and the cylindrical sleeve continues to slide towards the second connecting piece, until the arc-shaped elastic steel sheet contacts the positioning buckle, the arc-shaped elastic steel sheet and the positioning buckle can be clamped and fixed, thereby positioning the sliding position of the cylindrical sleeve on the center rod and limiting the expansion angle of the two support rods, so that the medicine feeding device is fixed in the borehole; the hole expanding device and the drill outside the borehole at present are separated from the medicine feeding device, and the medicine feeding device realizes the work of pre-sealing the borehole.

[0016] D, the static crushing charge into the medicine shovel, and then the medicine shovel and telescopic push rod connection, so that the medicine shovel through the hollow cylindrical cavity into the borehole inside, then through the telescopic push rod from the medicine shovel static crushing charge from the borehole, after the static crushing charge is loaded into the borehole, the medicine shovel and telescopic push rod from the borehole, complete the process of sending medicine;

[0017] E, the disc plug and medicine device threaded connection, so that the disc plug to the borehole mouth sealing, finally complete the whole static blasting hole expansion medicine and hole sealing process, finally the static crushing charge in the borehole through its own chemical reaction produces sustained expansion stress and thermal stress, because the borehole through the medicine device and disc plug double sealing, the sustained expansion stress and thermal stress generated by the borehole wall, finally realize the coal seam hard roof of high efficiency weakening and cracking.

[0018] Compared with the prior art, the application adopts the combination of the hole sealing device, the hole expanding device and the medicine feeding device, after the upward drilling is completed, the device is put into the upward drilling, because the tension spring is in the tension state during the putting process, and the elastic potential energy of the tension spring in the tension state is greater than the elastic potential energy of the compression spring in the compression state, so that the two supporting rods are in the closed state, the hole expanding device and the medicine feeding device are facilitated to enter the drilling, then the hole sealing device is taken off after being put in, at this time, the tension spring resets, the tension force of the tension spring on the cylindrical sleeve disappears, the two compression springs respectively exert the elastic force on the two connecting rods, and then the other end of the two supporting rods starts to expand until the other end of the two supporting rods respectively contacts the inner wall of the drilling to stop expanding, then the pushing rod and the reset spring are pushed by the drilling machine, so that the pushing rod completes a reciprocating linear motion in the shell, and then the cutting slot drill bit expands the drilling around the hole expanding device and forms the annular cutting slot; because the cutting slot drill bit can expand to different angles, the drilling is facilitated to be expanded, the drilling space is increased, and the use amount of the static blasting cartridge is improved; after the completion, the hole expanding device and the medicine feeding device are moved to the drilling orifice direction by the drilling machine, until the medicine feeding device reaches the position where the hole expanding device expands the hole, the other end of the two supporting rods enters the annular cutting slot, so that the medicine feeding device is fixed in the drilling, and the pre-sealing effect is realized; then the static breaking cartridge is pushed into the drilling through the medicine feeding shovel and the telescopic rod, after the static breaking cartridge is completely loaded into the drilling, the disc plug is threadedly connected with the medicine feeding device, so that the disc plug seals the drilling orifice, a double sealing effect is formed, the hole sealing effect is good, the sealing property is strong, and the effect of preventing the cartridge from being sprayed is achieved, so that the static breaking cartridge in the drilling is fully utilized to generate the continuous expansion stress and thermal stress by the chemical reaction of the static breaking cartridge itself, and finally the hard roof of the coal seam is efficiently weakened and cracked; in addition, as described above, the device can be used for the drilling expansion and hole sealing alone, and can be used in cooperation with the medicine feeding device, so that the expansion, medicine feeding and hole sealing are integrated, the work amount is reduced, and the device has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the initial state structure schematic diagram of the application;

[0020] Figure 2 It is the structure schematic diagram of the hole expanding device in the application;

[0021] Figure 3 It is Figure 2 It is the sectional view when the cutting slot drill bit extends out of the shell;

[0022] Figure 4 It is the structure schematic diagram of the medicine feeding device in the application;

[0023] Figure 5 It is the structure schematic diagram of the medicine feeding device after the hole sealing device is installed in the medicine feeding device in the application;

[0024] Figure 6 Figure 1 is a schematic diagram of the hole sealing device of the present application;

[0025] Figure 7 Figure 2 is a sectional view of the positioning buckle of the present application;

[0026] Figure 8 Figure 3 is a schematic diagram of the medicine delivery shovel and telescopic push rod of the present application.

[0027] In the figure: 100 - hole sealing device; 200 - hole expanding device; 300 - medicine delivery device; 101 - disc plug; 201 - return spring; 202 - housing; 203 - push rod; 204 - positioning pin shaft; 205 - rotating pin shaft; 206 - slotted drill bit; 207 - snap spring; 301 - first connecting piece; 302 - cylindrical sleeve; 303 - central rod; 304 - second connecting piece; 305 - connecting rod; 306 - support rod; 307 - fan-shaped lifting lug; 308 - rectangular lifting lug; 309 - pin; 310 - compression spring; 311 - tension spring; 312 - hollow cylindrical cavity; 313 - positioning buckle; 314 - medicine delivery shovel; 315 - telescopic push rod. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the accompanying drawings.

[0029] As shown in Figure 1 , the present application comprises a hole sealing device 100, a hole expanding device 200 and a medicine delivery device 300;

[0030] As shown in Figure 2 , the hole expanding device 200 comprises a return spring 201, a housing 202, a push rod 203, a positioning pin shaft 204, a rotating pin shaft 205 and a slotted drill bit 206, the housing 202 is a cylinder with one open end and the other end blocked, a through slot is formed on the side of the housing 202, the push rod 203 is provided with a threaded groove at one end and extends into the housing 202 from the open end of the housing at the other end, and the push rod 203 can slide axially in the housing 202; as Figure 3As shown, the slotting drill bit 206 is hinged with the other end of the advancing rod 203 through the rotating pin 205, so that the slotting drill bit 206 can rotate relative to the advancing rod 203 with the rotating pin 205 as the center and extend out of the shell 202 from the through slot; the rotating pin 205 is provided with a circlip 207 for limiting the axial movement of the rotating pin 205; the slotting drill bit 206 is provided with a strip-shaped limiting hole; there are two positioning pin shafts 204, both of which are inside the shell 202 and fixedly connected with the shell 202 at both ends; one of the positioning pin shafts 204 penetrates through the strip-shaped limiting hole, and the other positioning pin shaft 204 is above the slotting drill bit 206; the advancing rod 203 can position the angle of the slotting drill bit 206 extending out of the through slot when the advancing rod 203 slides axially in the shell 202; the reset spring 201 is sleeved outside the advancing rod 203, one end of the reset spring 201 is fixedly connected with the threaded groove end of the advancing rod 203, and the other end is fixedly connected with the open end of the shell 202;

[0031] As Figure 4As shown, the medicine delivery device 300 comprises a first connecting piece 301, a cylindrical sleeve 302, a center rod 303, a second connecting piece 304, connecting rods 305, a tension spring 311 and support rods 306, the center rod 303 is between the first connecting piece 301 and the second connecting piece 304, and the first connecting piece 301, the center rod 303 and the second connecting piece 304 are coaxial in turn and are connected by threads; the first connecting piece 301, the center rod 303 and the second connecting piece 304 are all provided with central through holes inside, and the three central through holes form a hollow cylindrical cavity 312, the cylindrical sleeve 302 is sleeved outside the center rod 303, and the cylindrical sleeve 302 can slide on the center rod 303 in the axial direction; the two sides of the cylindrical sleeve 302 are symmetrically fixed with rectangular lugs 308, the two sides of the second connecting piece 304 are symmetrically fixed with fan-shaped lugs 307, one end of the two support rods 306 is respectively hinged with the two fan-shaped lugs 307 through a pin 309, one end of the two connecting rods 305 is respectively hinged with the two rectangular lugs 308, and the other end of the two connecting rods 305 is respectively hinged with the side portions of the two support rods 306; the two sides of the second connecting piece 304 are symmetrically fixed with compression springs 310, one end of the two compression springs 310 is respectively fixedly connected with the two sides of the second connecting piece 304, and the other end of the two compression springs 310 is respectively fixedly connected with the side portions of the two connecting rods 305; the two compression springs 310 respectively apply elastic force to the two connecting rods 305, so that the two connecting rods 305 expand towards the two sides of the second connecting piece 304, thereby driving the two support rods 306 to expand towards the two sides and simultaneously driving the cylindrical sleeve 302 to slide on the center rod 303 towards the second connecting piece 304; the inner wall of the cylindrical sleeve 302 is embedded with arc-shaped elastic steel sheets, the outside of the center rod 303 is provided with a positioning buckle 313, and when the arc-shaped elastic steel sheets contact the positioning buckle 313 during the sliding process of the cylindrical sleeve 302 on the center rod 303, the arc-shaped elastic steel sheets and the positioning buckle 313 can be mutually clamped and fixed, so as to position the sliding position of the cylindrical sleeve 302 on the center rod 303 and limit the expansion angle of the two support rods 306; the tension spring 311 is two, one end of the two tension springs 311 is respectively fixedly connected with the two rectangular lugs 308, and the other end of the two tension springs 311 is in the shape of a hook; the other end of the support rod 306 is in a chamfered structure;

[0032] As shown in the figure, Figure 6 The hole sealing device 100 is a disc plug 101, the center of the disc plug 101 is provided with a threaded connecting column, the disc plug 101 is threadedly connected with the threaded groove of the advancing rod 203 through the threaded connecting column, the disc plug 101 is provided with two connecting rings, and the other end of the two tension springs 311 is respectively detachably connected with the two connecting rings, so that the two tension springs 311 are in a tension state.

[0033] Further, as shown in the figure, Figure 8As shown, it also includes a medicine delivery shovel 314 and a telescopic push rod 315, the medicine delivery shovel 314 is a hollow rod structure, the telescopic push rod 315 extends into the medicine delivery shovel 314 and can slide in the medicine delivery shovel 314; the outer diameter of the medicine delivery shovel 314 is smaller than the inner diameter of the hollow cylindrical cavity 312, and the inner diameter of the medicine delivery shovel 314 is larger than the outer diameter of the telescopic push rod 315. The use of this device can facilitate the static broken cartridge to be put into the drill hole.

[0034] Further, one end of the telescopic push rod 315 is provided with an antiskid rubber pad. The addition of this structure can increase the contact friction force between the telescopic push rod 315 and the medicine delivery shovel 314 and the contact area with the static broken cartridge, so as to ensure that the static broken cartridge can be pushed to the required position.

[0035] Further, the elastic potential energy of the tensile spring 311 in the tensile state is greater than the elastic potential energy of the compression spring 310 in the compressed state. In this way, it can be ensured that the two support rods 306 will not be in an expanded state when the tensile spring 311 is stretched, facilitating the device to be put into the drill hole.

[0036] The working method of the static blasting hole expanding, medicine delivering and hole sealing device is as follows:

[0037] A, after completing the upward drilling work, the hole sealing device 100, the hole expanding device 200 and the medicine delivering device 300 are assembled into the static blasting hole expanding, medicine delivering and hole sealing device, at this time the tensile spring 311 is in the tensile state, and the two support rods 306 are in the closed state, then the medicine delivering device 300 is put into the drill hole from one end, until the disc plug 101 in the hole sealing device 100 contacts the drill hole orifice when the medicine delivering device 300 contacts the bottom of the drill hole, the disc plug 101 is separated from the tensile spring 311 and taken out from the drill hole orifice, at this time the tensile spring 311 resets, the tensile force of the tensile spring 311 on the cylindrical sleeve 302 disappears, the two compression springs 310 respectively exert elastic force on the two connecting rods 305, so that the two connecting rods 305 expand towards the two sides of the second connecting piece 304, and then drive the two support rods 306 to expand towards the two sides, and drive the cylindrical sleeve 302 to slide on the center rod 303 towards the second connecting piece 304; until the other ends of the two support rods 306 respectively contact the inner wall of the drill hole, the expansion of the two support rods 306 is stopped;

[0038] B, the drill is coaxially connected with the propulsion rod 203 of the reaming device 200, the drill drives the propulsion rod 203 to rotate and press the propulsion rod 203 in the direction of the borehole, at this time the propulsion rod 203 moves to the bottom of the borehole in the shell 202, and in the moving process, the undercutting drill bit 206 is limited by the two positioning pin shafts 204, so that one end of the undercutting drill bit 206 extends out of the shell 202 from the through groove and presses and reams the inner wall of the borehole, and at the same time the return spring 201 is continuously compressed to increase the elastic potential energy; until the undercutting drill bit 206 reaches the maximum limiting angle, then the drill keeps rotating and stops pressing and moves to the direction of the borehole orifice, at this time the return spring 201 exerts an elastic force on the propulsion rod 203, so that the propulsion rod 203 moves to the direction of the borehole orifice with the drill, the return spring 201 is gradually reset, and the undercutting drill bit 206 is retracted into the shell 202, until it returns to the initial position, so that the borehole around the reaming device is reamed and the annular groove is formed;

[0039] C, after the reaming work is completed, the entire static blasting reaming, charging and hole sealing device is moved to the direction of the borehole orifice by the drill, since the other ends of the two supporting rods 306 are chamfered structures, they can slide relative to the inner wall of the borehole when the charging device 300 is forced to move, until the charging device 300 reaches the position where the reaming device 200 is reamed, the other ends of the two supporting rods 306 enter the annular groove, and the cylindrical sleeve 302 continues to slide to the second connecting piece 304, as shown in Figure 7 , until the arc-shaped elastic steel sheet contacts the positioning buckle 313, the arc-shaped elastic steel sheet and the positioning buckle 313 are mutually clamped, so as to position the sliding position of the cylindrical sleeve 302 on the center rod 303 and limit the expansion angle of the two supporting rods 306, so that the charging device 300 is fixed in the borehole; the reaming device 200 and the drill outside the borehole are separated from the charging device 300, so as to realize the pre-hole sealing work of the charging device 300 on the borehole;

[0040] D, the static crushing charge is put into the charging shovel 314, then the charging shovel 314 and the telescopic push rod 315 are connected, so that the charging shovel 314 passes through the hollow cylindrical cavity 312 and enters the inside of the borehole, then the static crushing charge is pushed from the charging shovel 314 into the borehole by the telescopic push rod 315, after the static crushing charge is completely loaded into the borehole, the charging shovel 314 and the telescopic push rod 315 are taken out from the borehole, and the charging process is completed;

[0041] E, as Figure 5As shown, the disc plug 101 is screwed with the medicine feeding device 300 to seal the drilling hole orifice by the disc plug 101, and finally the whole static blasting reaming medicine feeding and hole sealing process is completed, finally the static fragmentation charge in the drilling hole generates continuous expansion stress and thermal stress by its chemical reaction, since the drilling hole is double sealed by the medicine feeding device 300 and the disc plug 101, the continuous expansion stress and thermal stress fully act on the inner wall of the drilling hole, and finally the hard roof of the coal seam is efficiently weakened and cracked.

[0042] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A static blasting reaming, charging and sealing device, characterized in that, The sealing device, the hole expanding device and the medicine feeding device are included. The hole expanding device includes a reset spring, a shell, a pushing rod, a positioning pin shaft, a rotating pin shaft and a slotting drill bit. The shell is a cylinder with one open end and the other closed end. A through slot is formed in the side of the shell. The pushing rod has a threaded groove at one end and extends into the shell from the open end of the shell at the other end. The pushing rod can slide along the axis in the shell. The slotting drill bit is hinged to the other end of the pushing rod through the rotating pin shaft, so that the slotting drill bit can rotate relative to the pushing rod with the rotating pin shaft as the center and extend out of the shell from the through slot. A clamping spring is mounted on the rotating pin shaft to limit the movement of the rotating pin shaft along its axis. A strip-shaped limiting hole is formed in the slotting drill bit. There are two positioning pin shafts, both of which are inside the shell and fixedly connected to the shell at both ends. One of the positioning pin shafts passes through the strip-shaped limiting hole, and the other is above the slotting drill bit. The pushing rod can position the angle of the slotting drill bit extending out of the through slot when it slides along the axis in the shell. The reset spring is sleeved outside the pushing rod, with one end fixedly connected to the threaded groove end of the pushing rod and the other end fixedly connected to the open end of the shell. The medicine feeding device includes a first connecting piece, a cylindrical sleeve, a center rod, a second connecting piece, a connecting rod, a stretching spring and a support rod. The center rod is between the first connecting piece and the second connecting piece, and the first connecting piece, the center rod and the second connecting piece are coaxial and connected by threads in sequence. The first connecting piece, the center rod and the second connecting piece are all provided with a central through hole, and the three central through holes form a hollow cylindrical cavity. The cylindrical sleeve is sleeved outside the center rod and can slide along the axis of the center rod. Rectangular lugs are symmetrically fixed on both sides of the cylindrical sleeve, and fan-shaped lugs are symmetrically fixed on both sides of the second connecting piece. The ends of the two support rods are hinged to the two fan-shaped lugs through pins, respectively. The ends of the two connecting rods are hinged to the two rectangular lugs, respectively. The other ends of the two connecting rods are hinged to the sides of the two support rods, respectively. Compression springs are symmetrically fixed on both sides of the second connecting piece. The ends of the two compression springs are fixedly connected to both sides of the second connecting piece, respectively. The other ends of the two compression springs are fixedly connected to the sides of the two connecting rods, respectively. The two compression springs apply elastic force to the two connecting rods, so that the two connecting rods expand towards both sides of the second connecting piece, thereby driving the two support rods to expand towards both sides and driving the cylindrical sleeve to slide on the center rod towards the second connecting piece. Arc-shaped elastic steel sheets are embedded in the inner wall of the cylindrical sleeve. The center rod is provided with a positioning buckle. When the arc-shaped elastic steel sheets contact the positioning buckle during the sliding process of the cylindrical sleeve on the center rod, the arc-shaped elastic steel sheets and the positioning buckle are clamped and fixed, thereby positioning the sliding position of the cylindrical sleeve on the center rod and limiting the expansion angle of the two support rods. The stretching spring is in two, with one end of each fixedly connected to a rectangular lug and the other end in the shape of a hook. The other end of the support rod is in a chamfered structure. The hole sealing device is a disc plug, a threaded connecting column is arranged at the center of the disc plug, the disc plug is connected with the threaded groove of the pushing rod through the threaded connecting column, two connecting rings are arranged on the disc plug, and the other ends of the two extension springs are detachably connected with the two connecting rings, so that the two extension springs are in a stretched state.

2. A static blasting reaming, charge delivery and sealing device according to claim 1, wherein, The medicine feeding shovel is a hollow rod structure, and the telescopic pushing rod extends into the medicine feeding shovel and can slide in the medicine feeding shovel.

3. A static blasting reaming, charge delivery and sealing device according to claim 2, wherein, The telescopic pushing rod is provided with an antiskid rubber pad at one end.

4. The static blasting reaming, charge delivery and sealing device of claim 1, wherein, The elastic potential energy of the extension spring in the stretched state is greater than the elastic potential energy of the compression spring in the compressed state.

5. A method of operating a static perforating charge and seal device according to any one of claims 1 to 4, wherein, The specific steps are as follows: A. After the upward drilling work is completed, the hole sealing device, the hole expanding device and the medicine feeding device are assembled into a static blasting hole expanding and medicine feeding and hole sealing device in sequence, at this time, the extension spring is in a stretched state, the two supporting rods are in a closed state, then the medicine feeding device is put into the drill hole from one end, until the disc plug contacts the bottom of the drill hole or the disc plug in the hole sealing device contacts the drill hole, the disc plug is separated from the extension spring and taken off from the drill hole, at this time, the extension spring is reset, the extension force of the extension spring on the cylindrical sleeve disappears, the two compression springs respectively exert elastic force on the two connecting rods, the two connecting rods expand towards the two sides of the second connecting piece, and then drive the two supporting rods to expand towards the two sides, and drive the cylindrical sleeve to slide on the center rod towards the second connecting piece; until the other ends of the two supporting rods respectively contact the inner wall of the drill hole, the expansion of the two supporting rods is stopped; B. The drill is coaxially connected with the pushing rod of the hole expanding device, the drill drives the pushing rod to rotate and press the pushing rod in the direction of the drill hole, at this time, the pushing rod moves in the shell towards the bottom of the drill hole, in the moving process, the slotting drill bit is limited by the two positioning pins, the one end of the slotting drill bit extends out of the shell from the through groove, and the inner wall of the drill hole is pressed and expanded, and the reset spring is continuously compressed to increase the elastic potential energy; until the slotting drill bit reaches the maximum limiting angle, then the drill remains in the rotating state and stops pressing and moves towards the drill hole, at this time, the reset spring exerts elastic force on the pushing rod, so that the pushing rod moves towards the drill hole along with the drill, the reset spring is gradually reset, and the slotting drill bit is retracted into the shell, until it returns to the initial position, so that the drill hole around the hole expanding device is expanded, and the annular slot is formed. C, after the reaming work is completed, the entire static blasting reaming, charging and hole sealing device is moved to the direction of the drill hole orifice by the drilling machine. Since the other end of the two support rods is chamfered, it can slide relative to the inner wall of the drill hole when the charging device is forced to move, until the charging device reaches the position where the reaming device reamed the hole, the other end of the two support rods enters the annular cutting groove, and the cylindrical sleeve continues to slide towards the second connecting piece until the arc-shaped elastic steel sheet contacts the positioning buckle, which can make the arc-shaped elastic steel sheet and the positioning buckle mutually clamped, thereby positioning the sliding position of the cylindrical sleeve on the center rod and limiting the expansion angle of the two support rods, so as to fix the charging device in the drill hole; the reaming device and the drilling machine outside the drill hole are separated from the charging device, and the charging device is used to pre-seal the drill hole; D, the static breaking charge is put into the charging shovel, then the charging shovel and the telescopic push rod are connected, the charging shovel passes through the hollow cylindrical cavity and enters the inside of the drill hole, then the static breaking charge is pushed into the drill hole from the charging shovel through the telescopic push rod, after the static breaking charge is completely loaded into the drill hole, the charging shovel and the telescopic push rod are taken out of the drill hole, and the charging process is completed; E, the disc plug is threadedly connected with the charging device, so that the disc plug seals the drill hole orifice, and the entire static blasting reaming, charging and hole sealing process is finally completed. Finally, the static breaking charge in the drill hole generates continuous expansion stress and thermal stress through its own chemical reaction, and finally realizes the efficient weakening and cracking of the hard roof of the coal seam.

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