An air impact assistor for a rotary drilling rig

Abstract

The present invention discloses a pneumatic impact assistor for a rotary drilling rig, which comprises a machine body, a pneumatic impactor and a drill bit connecting sleeve. The upper end of the machine body is fixedly connected to the drill pipe of the rotary drilling rig. The pneumatic impactor is fixedly arranged inside the middle of the machine body. The pneumatic impactor includes an air inlet end flange, an impactor housing, an impact hammer and an air outlet end flange. The two ends of the impactor housing are respectively fixedly connected to the air inlet end flange and the air outlet end flange. The impact hammer is fixedly arranged inside the impactor housing. The impact hammer includes a cylinder body, an air inlet seat, a hammer head and a one-way valve assembly, an air inlet valve rod, a piston and a fixed sleeve which are coaxially arranged inside the cylinder body. The present invention is installed on a rotary drilling rig, enabling the rotary drilling rig to be applicable to the drilling construction of various strata such as sandy soil, cohesive soil, silty soil and rock stratum. When encountering a rock stratum, only need to turn on the air source to make the pneumatic impactor work, and apply high-frequency impact to the drill bit on the basis of the rotation of the drill bit for drilling, then the rock at the bottom of the hole can be easily broken, greatly improving the drilling efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary drilling rig manufacturing, and particularly to a pneumatic impact assistor for a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a construction machine used for hole-forming operations in building foundation engineering, mainly applicable to the construction of soil layers such as sandy soil, cohesive soil, and silty soil. It has the characteristics of fast hole-forming speed, less pollution, and strong mobility, so it is widely used. However, for hard rock formations, if a rotary drilling rig of the existing technology is forced to drill, not only is the drilling speed slow, the drill tool wears quickly, and the mechanical equipment is severely damaged, but also mechanical accidents such as drill pipe splitting are likely to occur. Therefore, it is necessary to replace it with a drilling device specifically for hard rock formations. During the actual pile foundation hole construction process, two or more different stratum structures are often encountered. Therefore, the construction party needs to replace the drilling equipment according to the stratum characteristics. This construction method of replacing the drilling equipment has the following disadvantages: due to the need for different drilling equipment, the construction cost is very high; frequent replacement of the drilling equipment results in low construction efficiency. Therefore, how to improve the existing rotary drilling rig so that it can be applicable to the drilling construction of various strata including hard rock formations is still a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a pneumatic impact assistor for a rotary drilling rig, which is installed on the rotary drilling rig to make it applicable to the drilling construction of various strata including hard rock formations, so as to solve the problems in the above background art that during the pile foundation hole construction process, when two or more different stratum structures are encountered, due to the need for different drilling equipment, the construction cost is very high; frequent replacement of the drilling equipment results in low construction efficiency.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A pneumatic impact assistor for a rotary drilling rig, comprising a machine body, a pneumatic impactor and a drill bit connecting sleeve. The upper end of the machine body is fixedly connected to the drill pipe of the rotary drilling rig. The pneumatic impactor is fixedly arranged inside the middle of the machine body. The pneumatic impactor includes an air inlet end flange, an impactor housing, an impact hammer and an air outlet end flange. The two ends of the impactor housing are respectively fixedly connected to the air inlet end flange and the air outlet end flange. The impact hammer is fixedly arranged inside the impactor housing. The impact hammer includes a cylinder body, an air inlet seat, a hammer head and a one-way valve assembly, an air inlet valve rod, a piston and a fixing sleeve coaxially arranged inside the cylinder body. One end of the cylinder body is fixedly connected to the fixing sleeve, and the other end is fixedly connected to the air inlet seat. One end of the one-way valve assembly abuts against the air inlet seat, and the other end is fixedly connected to the air inlet valve rod. The air inlet valve rod is a hollow valve rod with a closed bottom. The piston is hermetically and slidably arranged in the middle inside the cylinder body. One end of the piston is sleeved on the air inlet valve rod and is hermetically and slidably connected to the air inlet valve rod. The other end of the piston can be sleeved in the fixing sleeve and is hermetically and slidably connected to the fixing sleeve. One end of the hammer head is hermetically and slidably arranged in the fixing sleeve, and the other end extends out of the air outlet end flange. The impact hammer is provided with an air distribution channel system to make the piston move back and forth in the cylinder body under the action of compressed air. The drill bit connecting sleeve is sleeved on the lower end of the machine body and is slidably connected to the machine body at a short distance. The lower end of the drill bit connecting sleeve is fixedly connected to the drill bit of the rotary drilling rig.

[0006] Further, the one-way valve assembly includes a one-way valve seat, a spring and a one-way valve rod. One end of the one-way valve seat abuts against the lower end surface of the air inlet seat, and the other end is pin-connected to the air inlet valve rod. A one-way valve sleeve is fixedly arranged at one end of the one-way valve seat facing the air inlet seat. The spring and the one-way valve rod are sequentially installed in the one-way valve sleeve. The one-way valve rod closes the air inlet of the air inlet seat under the action of the spring.

[0007] Further, the air distribution channel system includes an air inlet joint, a first hole, a second hole, an air distribution hole, a first air distribution chamber, a second air distribution chamber, an upper air chamber, a lower air chamber, a first annular groove, a second annular groove, a third hole, a fourth hole and a fifth hole. The air inlet joint is fixedly arranged on the air inlet end flange. The first hole is opened inside the air inlet end flange and communicates the air inlet joint and the air inlet of the air inlet seat. The second hole is opened in the one-way valve seat and communicates the air inlet seat and the air inlet valve rod. The air distribution hole is opened on the side wall at the lower end of the air inlet valve rod. The upper air chamber is formed by the cylinder body, the air inlet valve rod and the piston. The lower air chamber is formed by the cylinder body, the fixing sleeve and the piston. The first annular groove is opened on the inner wall of the cylinder body. The second annular groove is opened on the outer periphery of the large end of the piston. The first air distribution chamber is opened inside the piston and communicates with the second annular groove. The second air distribution chamber and the fifth hole are opened inside the piston. The second air distribution chamber communicates with the upper air chamber through the fifth hole. The third hole is coaxially opened inside the piston and communicates with the first air distribution chamber and the second air distribution chamber and penetrates through the piston. The fourth hole is opened inside the hammer head and coaxially penetrates through the hammer head.

[0008] Further, the machine body successively includes a drill pipe connection area, an impactor placement area, and a bit connection sleeve connection area from top to bottom. The drill pipe connection area is pin-connected to the drill pipe of the rotary drilling rig through a first pin shaft. The pneumatic impactor is fixedly arranged inside the impactor placement area. Through holes are formed in the two side walls of the bit connection sleeve connection area. Waist-shaped grooves are formed in the two side walls of the bit connection sleeve. The bit connection sleeve is fittingly sleeved in the bit connection sleeve connection area and is connected through a second pin shaft passing through the through holes and the waist-shaped grooves, so that the bit connection sleeve can slide back and forth along the axial direction within the length range of the waist-shaped groove in the bit connection sleeve connection area. The bit connection sleeve is pin-connected to the bit of the rotary drilling rig through a third pin shaft.

[0009] Further, a hammering plate is fixedly arranged at one end of the bit connection sleeve close to the pneumatic impactor, and a through hole is formed in the center position of the hammering plate.

[0010] Further, a baffle plate, a mounting plate, and split pressure plates for preventing the pneumatic impactor from rotating are fixedly arranged in the impactor placement area. The pneumatic impactor is placed inside the split pressure plates. The intake end flange of the pneumatic impactor abuts against the baffle plate, and the outlet end flange of the pneumatic impactor is fixedly connected to the mounting plate.

[0011] Further, a first cover plate, a second cover plate, and a third cover plate are respectively fixedly arranged on the drill pipe connection area, the impactor placement area, and the bit connection sleeve connection area for enclosing the machine body. A through hole for exposing the intake joint is formed at one end of the second cover plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. The present invention is installed on a rotary drilling rig, enabling the rotary drilling rig to be applicable to the drilling construction of various strata such as sandy soil, cohesive soil, silty soil, and rock stratum. When encountering soft soil layers, the rotary drilling rig itself is used for rotary drilling construction. When encountering rock stratum, only the gas source needs to be turned on to make the pneumatic impactor work, and on the basis of the rotation of the bit for drilling, a high-frequency impact is applied to the bit, so that the rock at the bottom of the hole can be easily broken, greatly improving the drilling efficiency. Moreover, since there is no need to replace other drilling equipment, the time for replacing equipment is saved, the work efficiency is further improved, and at the same time, the usage fee of another drilling equipment is eliminated, greatly reducing the construction cost.

[0014] 2. The present invention is provided with a pneumatic impactor. When the rotary drilling rig drills in hard rock formations, by introducing high-pressure air, the piston in the pneumatic impactor can move back and forth rapidly and continuously impact the drill bit at high frequency, so that an impact force is applied to the drill bit on the basis of rotary drilling, breaking the hard rock formation at the bottom of the hole, greatly improving the drilling efficiency, and using the pressure-relief gas in the upper air chamber and the lower air chamber to blow crushed stones and other impurities into the drill bucket for effective hole cleaning, keeping the bottom of the hole free of excessive impurities, which is beneficial to the drilling work of the drill bit and further improving the drilling efficiency.

[0015] 3. Connection devices for the drill pipe and the drill bit are respectively arranged at the upper and lower ends of the present invention. Without any modification to the existing rotary drilling rig, it can be quickly installed on the rotary drilling rig, which is of great significance for the large-scale promotion of the modification and application of the present invention on the existing rotary drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the three-dimensional view of the present invention;

[0017] Figure 2 is the three-dimensional view of the present invention after the cover plate is opened;

[0018] Figure 3 is the three-dimensional explosion view of the present invention;

[0019] Figure 4 is the three-dimensional view of the pneumatic impactor of the present invention;

[0020] Figure 5 is the sectional view of the present invention;

[0021] Figure 6 is the sectional view of the pneumatic impactor of the present invention;

[0022] In the figure: 1 - body, 101 - drill pipe connection area, 102 - hammer placement area, 103 - bit connection sleeve connection area, 104 - first cover plate, 105 - second cover plate, 106 - third cover plate, 107 - pin hole, 108 - baffle plate, 109 - mounting plate, 2 - pneumatic hammer, 3 - intake end flange, 301 - intake joint, 302 - first passage, 4 - hammer housing, 5 - impact hammer, 501 - cylinder body, 502 - intake seat, 503 - check valve stem, 504 - check valve seat, 505 - intake valve stem, 506 - piston, 507 - fixed sleeve, 508 - hammer head, 509 - check valve sleeve, 510 - spring, 511 - second passage, 512 - air distribution hole, 513 - first air distribution chamber, 514 - second air distribution chamber, 515 - upper air chamber, 516 - lower air chamber, 517 - first annular groove, 518 - second annular groove, 519 - third passage, 520 - fourth passage, 521 - fifth passage, 6 - outlet end flange, 7 - split pressure plate, 8 - bit connection sleeve, 801 - hammering plate, 802 - kidney-shaped groove, 9 - first pin shaft, 10 - second pin shaft, 11 - third pin shaft. Detailed implementation mode

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1:

[0025] Please refer to Figures 1-6, A pneumatic impact assistor for a rotary drilling rig, comprising a body 1, a pneumatic impactor 2 and a drill bit connecting sleeve 8. The upper end of the body 1 is fixedly connected to the drill pipe of the rotary drilling rig by a connecting pin. The pneumatic impactor 2 is fixedly installed inside the middle of the body 1. The pneumatic impactor 2 includes an air inlet flange 3, an impactor housing 4, an impact hammer 5 and an air outlet flange 6. Both ends of the impactor housing 4 are welded to the air inlet flange 3 and the air outlet flange 6 respectively. The impact hammer 5 is fixedly installed inside the impactor housing 4. The impact hammer 5 includes a cylinder body 501, an air inlet seat 502, a hammer head 508, and a one-way valve assembly, an air inlet valve rod 505, a piston 506, and a fixing sleeve 507 coaxially arranged inside the cylinder body 501. One end of the cylinder body 501 is fixedly connected to the fixing sleeve 507 by a thread, and the other end is fixedly connected to the air inlet seat 502 by a thread. One end of the one-way valve assembly abuts against the air inlet seat 502, and the other end is fixedly connected to the air inlet valve rod 505 by a connecting pin. The air inlet valve rod 505 is a hollow valve rod with a closed bottom. The piston 506 is hermetically and slidably arranged in the middle inside the cylinder body 501. One end of the piston 506 is sleeved on the air inlet valve rod 505 and is hermetically and slidably connected to the air inlet valve rod 505. The other end of the piston 506 can be sleeved inside the fixing sleeve 507 and is hermetically and slidably connected to the fixing sleeve 507. One end of the hammer head 508 is hermetically and slidably arranged inside the fixing sleeve 507, and the other end extends out of the air outlet flange 6. The impact hammer 5 is provided with a gas distribution channel system, so that the piston 506 moves back and forth inside the cylinder body 501 under the action of compressed air. The drill bit connecting sleeve 8 is sleeved on the lower end of the body 1 and is slidably connected to the body 1 at a short distance. The lower end of the drill bit connecting sleeve 8 is fixedly connected to the drill bit of the rotary drilling rig by a connecting pin.

[0026] Wherein, the one-way valve assembly includes a one-way valve seat 504, a spring 510 and a one-way valve rod 503. One end of the one-way valve seat 504 abuts against the lower end surface of the air inlet seat 502, and the other end is fixedly connected to the air inlet valve rod 505 by a connecting pin. A one-way valve sleeve 509 is installed at one end of the one-way valve seat 504 facing the air inlet seat 502. The spring 510 and the one-way valve rod 503 are sequentially installed inside the one-way valve sleeve 509. The one-way valve rod 503 closes the air inlet of the air inlet seat 502 under the action of the spring 510. The one-way valve assembly ensures that the compressed air can only flow unidirectionally towards the pneumatic impactor 2, preventing the compressed air from flowing back.

[0027] Among them, the air distribution channel system includes an air inlet joint 301, a first channel 302, a second channel 511, an air distribution hole 512, a first air distribution chamber 513, a second air distribution chamber 514, an upper air chamber 515, a lower air chamber 516, a first annular groove 517, a second annular groove 518, a third channel 519, a fourth channel 520, and a fifth channel 521. The air inlet joint 301 is welded to the air inlet flange 3. The first channel 302 is opened inside the air inlet flange 3 and communicates with the air inlet of the air inlet joint 301 and the air inlet seat 502. The second channel 511 is opened in the one-way valve seat 504 and communicates with the air inlet seat 502 and the air inlet valve stem 505. The air distribution hole 512 is opened on the lower side wall of the air inlet valve stem 505. The upper air chamber 515 is formed by enclosing the cylinder body 501, the air inlet valve stem 505, and the piston 506. The lower air chamber 516 is formed by enclosing the cylinder body 501, the fixed sleeve 507, and the piston 506. The first annular groove 517 is opened on the inner wall of the cylinder body 501. The second annular groove 518 is opened on the outer periphery of the large end of the piston 506. The first air distribution chamber 513 is opened inside the piston 506 and communicates with the second annular groove 518. The second air distribution chamber 514 and the fifth channel 521 are opened inside the piston 506. The second air distribution chamber 514 communicates with the upper air chamber 515 through the fifth channel 521. The third channel 519 is coaxially opened inside the piston 506 and communicates with the first air distribution chamber 513 and the second air distribution chamber 514 and penetrates through the piston 506. The fourth channel 520 is opened inside the hammer head 508 and coaxially penetrates through the hammer head 508.

[0028] Among them, the machine body 1 successively includes a drill pipe connection area 101, a percussion drill placement area 102, and a drill bit connection sleeve connection area 103 from top to bottom. The drill pipe connection area 101 is pin-connected to the drill pipe of the rotary drilling rig through the first pin shaft 9. The pneumatic percussion drill 2 is fixedly installed inside the percussion drill placement area 102. Through holes 107 are opened on both side walls of the drill bit connection sleeve connection area 103. Waist-shaped grooves 802 are opened on both side walls of the drill bit connection sleeve 8. The drill bit connection sleeve 8 is fittedly sleeved inside the drill bit connection sleeve connection area 103 and is passed through the through holes 107 and the waist-shaped grooves 802 by the second pin shaft 10, so that the drill bit connection sleeve 8 can slide back and forth axially within the drill bit connection sleeve connection area 103 within the length range of the waist-shaped groove 802. The drill bit connection sleeve 8 is pin-connected to the drill bit of the rotary drilling rig through the third pin shaft 11.

[0029] Among them, a hammering plate 801 is welded to one end of the drill bit connection sleeve 8 close to the pneumatic percussion drill 2, and a through hole is opened at the center position of the hammering plate 801.

[0030] Among them, a baffle 108, a mounting plate 109, and split pressing plates 7 for preventing the pneumatic percussion drill 2 from rotating are welded inside the percussion drill placement area 102. The pneumatic percussion drill 2 is placed inside the split pressing plates 7. The air inlet flange 3 of the pneumatic percussion drill 2 abuts against the baffle 108, and the air outlet flange 6 of the pneumatic percussion drill 2 is fixedly connected to the mounting plate 109 by bolts.

[0031] Wherein, a first cover plate 104 and a third cover plate 106 are respectively welded on the upper parts of the drill pipe connection area 101 and the bit connection sleeve connection area 103, and a second cover plate 105 is fixed to the upper part of the impactor placement area 102 with bolts, which is used to seal the body 1 to prevent mud and dirt from entering the body 1 during the working process. A through hole for exposing the air inlet joint 301 is opened at one end of the second cover plate 105 to ensure the working space for connecting the air pipe.

[0032] Working principle of the present invention:

[0033] First, remove the bit of the rotary drilling rig from the drill pipe, fixedly connect the present invention to the drill pipe by using the first pin shaft 9, fixedly connect the bit of the rotary drilling rig to the bit connection sleeve 8 by using the third pin shaft 11, and then connect the gas source to the air inlet joint 301 through the air pipe.

[0034] When the rotary drilling rig is working, when encountering a soft formation, there is no need to turn on the gas source, and the present invention does not work, only playing a role of transitional connection. The rotary drilling rig rotates and drills according to the normal working process, that is, the motor drives the drill pipe to rotate, drives the invention, and further drives the bit to rotate and drill.

[0035] When the rotary drilling rig is working and encounters difficulties in drilling through hard rock formations, the air source is turned on. High-pressure gas enters the air intake seat 502 from the air intake joint 301 through the first channel 302, pushing open the check valve rod 503. Then it enters the air intake valve rod 505 through the second channel 511. The high-pressure gas passes through the air distribution holes 512 along the air intake valve rod 505 and enters the first air distribution chamber 513, the second annular groove 518, the first annular groove 517, and the lower air chamber 516. The air pressure in the lower air chamber 516 continuously rises. When it is greater than the air pressure in the upper air chamber 515, the piston 506 moves towards the upper air chamber 515. At the same time, the gas in the upper air chamber 515 enters the air passage of the drill bit through the fifth channel 521, the second air distribution chamber 514, the third channel 519, the fourth channel 520, and the through holes of the hammer plate 801. On the one hand, it relieves the pressure of the upper air chamber 515, and on the other hand, it blows away the crushed stones to facilitate the collection of the crushed stones by the drill bit bucket and prevent the crushed stones from remaining at the bottom of the hole, causing difficulties in the drilling work. When the piston 506 continues to move towards the upper air chamber 515 for a certain distance, the second air distribution chamber 514 is closed by the air intake valve rod 505, and the upper air chamber 515 no longer relieves pressure. The gas entering the lower air chamber 516 from the air distribution holes 512 continues to push the piston 506 to compress the gas in the upper air chamber 515. When the piston 506 closes the second annular groove 518, the lower air chamber 516 stops admitting air. Due to inertia, the piston 506 continues to move towards the upper air chamber 515. When the air distribution holes 512 communicate with the second air distribution chamber 514, the high-pressure air from the air source enters the upper air chamber 515 through the air distribution holes 512, the second air distribution chamber 514, and the fifth channel 521 to further pressurize the upper air chamber 515. When the small end of the piston 506 moves out of the fixed sleeve 507, the gas in the lower air chamber 516 enters the fixed sleeve 507 and quickly relieves pressure through the fourth channel 520 and the drill bit air passage and blows the crushed stones at the bottom of the hole. The high-pressure gas in the upper air chamber 515 pushes the piston 506 to quickly move towards the hammer head 508 and strike the hammer head 508, which in turn causes the hammer head 508 to strike the hammer plate 801, that is, it means striking the drill bit connection sleeve 8 and the rotary drilling rig drill bit. At this time, the air distribution holes 512 have communicated with the first air distribution chamber 513, and the piston no longer closes the second annular groove 518. The high-pressure air from the air source enters the lower air chamber 516 again and pushes the piston. In this way, the piston moves back and forth and continuously strikes the hammer head 508, the drill bit connection sleeve 8, and the rotary drilling rig drill bit at high speed, applying an impact force during the rotary drilling process of the drill bit, shattering the hard rock formation at the bottom of the hole, greatly improving the drilling efficiency, and using the pressure-relieving gas in the upper air chamber 515 and the lower air chamber 516 to blow the shattered stones into the drill bucket, keeping the bottom of the hole free of excessive impurities, which is beneficial to the drilling work of the drill bit and further improves the drilling efficiency.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic impact assistor for a rotary drilling rig, characterized in that: It includes a body (1), a pneumatic impactor (2) and a drill bit connecting sleeve (8). The upper end of the body (1) is fixedly connected to the drill pipe of a rotary drilling rig. The pneumatic impactor (2) is fixedly arranged inside the middle of the body (1). The pneumatic impactor (2) includes an air inlet end flange (3), an impactor housing (4), an impact hammer (5) and an air outlet end flange (6). The two ends of the impactor housing (4) are respectively fixedly connected to the air inlet end flange (3) and the air outlet end flange (6). The impact hammer (5) is fixedly arranged inside the impactor housing (4). The impact hammer (5) includes a cylinder body (501), an air inlet seat (502), a hammer head (508), and a one-way valve assembly, an air inlet valve rod (505), a piston (506), and a fixing sleeve (507) coaxially arranged inside the cylinder body (501). One end of the cylinder body (501) is fixedly connected to the fixing sleeve (507), and the other end is fixedly connected to the air inlet seat (502). One end of the one-way valve assembly abuts against the air inlet seat (502), and the other end is fixedly connected to the air inlet valve rod (505). The air inlet valve rod (505) is a hollow valve rod with a closed bottom. The piston (506) is hermetically and slidably arranged in the middle inside the cylinder body (501). One end of the piston (506) is sleeved on the air inlet valve rod (505) and is hermetically and slidably connected to the air inlet valve rod (505). The other end of the piston (506) can be sleeved inside the fixing sleeve (507) and is hermetically and slidably connected to the fixing sleeve (507). One end of the hammer head (508) is hermetically and slidably arranged inside the fixing sleeve (507), and the other end extends out of the air outlet end flange (6). The impact hammer (5) is provided with a gas distribution channel system to make the piston (506) move back and forth inside the cylinder body (501) under the action of compressed air. The drill bit connecting sleeve (8) is sleeved on the lower end of the body (1) and is slidably connected to the body (1) at a short distance. The lower end of the drill bit connecting sleeve (8) is fixedly connected to the drill bit of the rotary drilling rig; The one-way valve assembly includes a one-way valve seat (504), a spring (510) and a one-way valve rod (503); One end of the drill bit connecting sleeve (8) close to the pneumatic impactor (2) is fixedly provided with a hammering plate (801), and a through hole is opened at the center position of the hammering plate (801).

2. The pneumatic impact assistor of a rotary drilling rig according to claim 1, characterized in that: One end of the one-way valve seat (504) abuts against the lower end face of the air inlet seat (502), and the other end is pin-connected to the air inlet valve rod (505). A one-way valve sleeve (509) is fixedly arranged at one end of the one-way valve seat (504) facing the air inlet seat (502). The spring (510) and the one-way valve rod (503) are sequentially installed inside the one-way valve sleeve (509). The one-way valve rod (503) closes the air inlet of the air inlet seat (502) under the action of the spring (510).

3. The pneumatic impact assistor for a rotary drilling rig according to claim 1 or 2, characterized in that: The air distribution channel system includes an air inlet joint (301), a first channel (302), a second channel (511), an air distribution hole (512), a first air distribution chamber (513), a second air distribution chamber (514), an upper air chamber (515), a lower air chamber (516), a first annular groove (517), a second annular groove (518), a third channel (519), a fourth channel (520) and a fifth channel (521). The air inlet joint (301) is fixedly arranged on the air inlet end flange (3). The first channel (302) is opened inside the air inlet end flange (3) and communicates with the air inlet of the air inlet joint (301) and the air inlet seat (502). The second channel (511) is opened on the one-way valve seat (504) and communicates with the air inlet seat (502) and the air inlet valve rod (505). The air distribution hole (512) is opened on the side wall of the lower end of the air inlet valve rod (505). The upper air chamber (515) is formed by being enclosed by a cylinder body (501), an air inlet valve rod (505) and a piston (506). The lower air chamber (516) is formed by being enclosed by a cylinder body (501), a fixed sleeve (507) and a piston (506). The first annular groove (517) is opened on the inner wall of the cylinder body (501). The second annular groove (518) is opened on the outer periphery of the large end of the piston (506). The first air distribution chamber (513) is opened inside the piston (506) and communicates with the second annular groove (518). The second air distribution chamber (514) and the fifth channel (521) are opened inside the piston (506). The second air distribution chamber (514) communicates with the upper air chamber (515) through the fifth channel (521). The third channel (519) is coaxially opened inside the piston (506) and communicates with the first air distribution chamber (513) and the second air distribution chamber (514) and penetrates through the piston (506). The fourth channel (520) is opened inside the hammer head (508) and coaxially penetrates through the hammer head (508).

4. The pneumatic impact assistor of a rotary drilling rig according to claim 1, characterized in that: The machine body (1) sequentially includes a drill pipe connection area (101), a percussion drill placement area (102) and a drill bit connection sleeve connection area (103) from top to bottom. The drill pipe connection area (101) is pin-connected to the drill pipe of the rotary drilling rig through a first pin shaft (9). The pneumatic percussion drill (2) is fixedly arranged inside the percussion drill placement area (102). Straight pin holes (107) are opened on both side walls of the drill bit connection sleeve connection area (103). Straight waist-shaped grooves (802) are opened on both side walls of the drill bit connection sleeve (8). The drill bit connection sleeve (8) is fittingly sleeved inside the drill bit connection sleeve connection area (103) and the second pin shaft (10) passes through the pin hole (107) and the waist-shaped groove (802), so that the drill bit connection sleeve (8) can slide back and forth axially within the drill bit connection sleeve connection area (103) within the length range of the waist-shaped groove (802). The drill bit connection sleeve (8) is pin-connected to the drill bit of the rotary drilling rig through a third pin shaft (11).

5. The pneumatic impact assistor of a rotary drilling rig according to claim 4, characterized in that: A baffle plate (108), a mounting plate (109) and split pressing plates (7) for preventing the pneumatic impactor (2) from rotating are fixedly arranged in the impactor placement area (102). The pneumatic impactor (2) is placed within the split pressing plates (7). The intake end flange (3) of the pneumatic impactor (2) abuts against the baffle plate (108), and the exhaust end flange (6) of the pneumatic impactor (2) is fixedly connected to the mounting plate (109).

6. The pneumatic impact assistor of a rotary drilling rig according to claim 4, characterized in that: A first cover plate (104), a second cover plate (105) and a third cover plate (106) are respectively and fixedly arranged on the upper parts of the drill pipe connection area (101), the impactor placement area (102) and the drill bit connection sleeve connection area (103) for enclosing the machine body (1). A through hole for exposing the intake joint (301) is formed at one end of the second cover plate (105).

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