CA3199658A1 - Large-diameter combination impactor and down-the-hole drilling rig - Google Patents

Abstract

Provided are a large-diameter combination impactor and a down-the-hole drilling rig comprising same; the impactor comprises a base (8), a first joint (1) connected to a drill pipe, a first fixing plate (2) arranged sleeved on said first joint, a first cylinder (3) removably connected to said first fixing plate, a second cylinder (4) connected to said first cylinder, the second cylinder being provided with a second fixing plate (5), and a reinforcement assembly (6) connected to the first fixing plate and the second fixing plate, respectively; said reinforcement assembly is connected to the first joint, the second cylinder is provided with at least two impact units (7), the base is provided with a fixing plate assembly (12) between the base and the second fixing plate, and the impact units pass through the fixing plate assembly. The large-diameter combination impactor and down-the-hole drilling rig have an increased overall axial length, and during the process of drilling holes in loose rock layers, have a high verticality of hole formation.

Description

LARGE-DIAMETER COMBINATION IMPACTOR AND DOWN-THE-HOLE
DRILLING RIG
[0001] This application claims the benefit of priority to the Chinese Patent Application No.
202011320910.X, titled "LARGE-DIAMETER COMBINATORIAL HAMMER AND
DOWN-THE-HOLE DRILL RIG", filed on November 23, 2020 with the China National Intellectual Property Administration, which is incorporated herein by reference in its entirety.
FIELD

[0002] The present application relates to the field of mining equipment, in particular to a large-diameter combinatorial hammer, and the present application further relates to a down-the-hole drill rig.
BACKGROUND

[0003] Underground pipelines are an important part of urban infrastructure and include several major categories such as water supply, water drainage, fuel gas, heat, electricity and industrial pipelines. In consideration of protection of surface buildings and requirements of construction efficiency, horizontally directional drilling technology is increasingly used in laying of urban underground pipelines. The horizontally directional drilling technology is a technique in which drilling equipment at the surface is used to drill into ground with a small angle of incidence relative to the ground, to form a pilot hole, then the diameter of the pilot hole is reamed step by step to the required size and then pipelines are laid. There are two main categories of geological layers of construction for a horizontally directional drill rig, namely soft soil strata and complex strata.

[0004] For non-excavation pipeline laying construction of the horizontally directional drill rig in the soft ground condition, due to the lower hardness of the ground and the long-time development, the current construction equipment for guide and reaming is developed more thoroughly. A guide hole may generally be formed by using a deflecting drill bit. For reaming construction, there are currently wing-shaped, spiral-shaped and recessed-shaped bits, which are complete in type and highly efficient in construction. By using bits with different diameters 301097307.2 to ream the hole step by step, the reaming requirements for large-diameter pipelines in the soft soil ground can be satisfied.

[0005] For non-excavation pipeline laying construction of the horizontally directional drill rig for complex stratum such as rock ground and gravel ground, due to the great technical difficulties, less research is carried on, and lots of problems occur in the construction.

[0006] With continuously developing economy, rapidly growing population and the on-going acceleration of urbanization process, the diameters of the underground pipelines are required to be larger and larger, and the demand for a large-diameter reaming device is becoming more and more urgent. However, increasing the diameter of reaming lines in the complex ground such as rock ground and gravel ground by increasing the diameter of pneumatic reaming hammer has the following deficiencies.

[0007] The rock drilling capacity of the hammer mainly depends on the impact force of the hammer on a rock surface. The impact force comes from the compressed air. In order to reduce the loss of the compressed air, generally, the distance between the drill pipe and the hammer unit is short. However, due to the large outer diameter (500 mm to 3000 mm) of the hammer, the axial length is relatively short, the axial length is relatively short, poor perpendicularity in hole formation may easily occur especially during drilling in ravelly ground.
SUMMARY

[0008] In order to solve the above technical problems, a large-diameter combinatorial hammer is provided according to the present application, in which the overall axial length is increased, resulting in good perpendicularity in hole formation during drilling in ravelly ground. A down-the-hole drill rig to which the above large-diameter combinatorial hammer is applied is further provided according to the present application, which also has the above advantageous effects.

[0009] The technical solutions according to the present application are as follows.

[0010] A large-diameter combinatorial hammer, including:
a base, a first joint configured to be connected to a drill pipe;
a first fixing plate sleeved onto the first joint;

301097307.2 a first barrel body detachably connected to the first fixing plate;
a second barrel body connected to the first barrel body, where a second fixing plate is provided on the second barrel body; and a reinforcing assembly connected to the first fixing plate and the second fixing plate respectively, where the reinforcing assembly is connected to the first joint;
where at least two hammer units are provided in the second barrel body, a fixing plate assembly is provided between the base and the second fixing plate, and the hammer units are each configured to pass through the fixing plate assembly.

[0011] Preferably, the large-diameter combinatorial hammer further includes a first fixing assembly, where the hammer units are connected to the second fixing plate through the first fixing assembly.

[0012] Preferably, the first fixing assembly includes a first connection member and a clamping seat; where each of the hammer units includes a second joint, the second joint is connected to the clamping seat in a clamping manner, a first pressing member is provided at one end of the first connection member, and the first pressing member is arranged above the second fixing plate;
and the first connection member passes through the second fixing plate and the clamping seat to be in threaded connection with the second joint.

[0013] Preferably, the large-diameter combinatorial hammer further includes a draw rod assembly, where one end of the draw rod assembly is connected to the base, and the other end of the draw rod assembly is connected to the second fixing plate.

[0014] Preferably, the draw rod assembly includes a draw rod passing through the second fixing plate, the fixing plate assembly and the base in sequence; and a second pressing member in threaded connection with one end of the draw rod, where a bottom of the second pressing member abuts against the second fixing plate, and the other end of the draw rod is in threaded connection with the base.

[0015] Preferably, the reinforcing assembly has an upper joint portion provided in a plumb 301097307.2 direction and connected to the first fixing plate; and where at least two first reinforcing ribs are provided on an outer wall of the upper joint portion, and the at least two first reinforcing ribs are connected to the first fixing plate.

[0016] Preferably, the reinforcing assembly further includes a lower joint portion having one end connected to the upper joint portion and the other end connected to the second fixing plate;
and at least two second reinforcing ribs are provided on an outer wall of the lower joint portion, and the at least two second reinforcing ribs are connected to the second fixing plate.

[0017] Preferably, a first air passage is provided in the first joint, a second air passage is provided in the reinforcing assembly, a first through-hole is provided in the second fixing plate, where the first air passage is in communication with the second air passage, the first through-hole and the hammer units in sequence.

[0018] Preferably, a third air passage is provided in the clamping seat, a fourth air passage is provided in the second joint, and the fourth air passage is in communication with the first through-hole through the third air passage.

[0019] A down-the-hole drill rig is provided, including the above large-diameter combinatorial hammer.

[0020] Compared with the conventional technology, with the large-diameter combinatorial hammer according to the present application, the first barrel body is provided in addition to the second barrel body, so that the axial length of the whole large-diameter combinatorial hammer is extended, to avoid rock slag falling into the hole before the hole is formed, thereby ensuring high perpendicularity in hole formation. On the other hand, the reinforcing assembly is provided inside the first barrel body, so that in the large-diameter combinatorial hammer, not only the second fixing plate is connected to the first barrel body, but also the first fixing plate and the second fixing plate are connected through the reinforcing assembly at a middle portion inside the first barrel body, so that the first barrel body and the second barrel body can be connected more securely. This arrangement avoids the shaking of the first fixing plate, the first barrel body, the second fixing plate and the second barrel body at the connection positions due to the unstable connection, thereby further ensuring high perpendicularity of hole formation. Thirdly, 301097307.2 during the drilling process of impacting the rock stratum, the rock stratum exerts a reverse impact force on the hammer units, with the arrangement of the fixing plate assembly, middle portions of the hammer units are fixed, thereby avoiding the problem of poor perpendicularity of hole formation due to playing of the hammer units. In summary, with the large-diameter combinatorial hammer according to the present application, the overall axial length is increased, and the high perpendicularity of hole formation is achieved in the process of drilling in loose rock stratum.

[0021] A down-the-hole drill rig, to which the above large-diameter combinatorial hammer is applied, is further provided according to the present application, which also has the above advantageous effects.
BRIEF DESCRIPTION OF THE DRAWINGS

[0022] For more clearly illustrating technical solutions in embodiments of the present application or in the conventional technology, drawings used in the description of the embodiments or the conventional technology will be briefly described hereinafter. Apparently, the drawings in the following description illustrate only some embodiments of the present application, for those skilled in the art, other drawings may be obtained based on the provided drawings without any creative efforts.

[0023] FIG. 1 is a schematic view showing the internal structure of a large-diameter combinatorial hammer according to an embodiment of the present application;

[0024] FIG. 2 is a schematic view showing the structure of the large-diameter combinatorial hammer with a second barrel body being mounted according to the embodiment of the present application;

[0025] FIG. 3 is a schematic view showing the structure of a reinforcing assembly according to an embodiment of the present application;

[0026] FIG. 4 is an exploded view of the reinforcing assembly according to the embodiment of the present application;

[0027] FIG. 5 is an exploded view of a fixing plate assembly and a draw rod assembly according to an embodiment of the present application;

301097307.2

[0028] FIG. 6 is a sectional view of the large-diameter combinatorial hammer according to the embodiment of the present application;

[0029] FIG. 7 is a sectional view of the large-diameter combinatorial hammer according to the embodiment of the present application;

[0030] FIG. 8 is a schematic view of a hammer unit according to an embodiment of the present application; and

[0031] FIG. 9 is a schematic view showing an external structure of an air distribution structure of the large-diameter combinatorial hammer according to an embodiment of the present application.

[0032] Reference numerals are as follows:
1 first joint, 2 first fixing plate, 3 first barrel body, 31 third slag discharge groove, 4 second barrel body, 42 second slag discharge groove, 5 second fixing plate, 500 first through-hole, 6 reinforcing assembly, 61 upper joint portion, 62 first reinforcing rib, 63 second reinforcing rib, 64 avoidance position, 65 second air passage, 66 lower joint portion, 7 hammer unit, 71 second joint, 711 fourth air passage, 712 first central hole, 72 check valve, 73 air distribution seat, 74 piston, 75 first air chamber, 76 second air chamber, 8 base, 81 first slag discharge groove, 82 mounting seat, 9 drill bit, 91 air outlet hole, 92 first air discharge groove, 10 draw rod assembly, 100 first air passage, 301097307.2 101 second pressing member, 11 first fixing assembly, 111 first connection member, 112 clamping seat, 113 first pressing member, 114 third barrel body, 1123 third air passage, 12 fixing plate assembly, 121 third fixing plate, 122 fourth fixing plate, 123 fifth fixing plate, 13 air chamber.
DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] For those skilled in the art to better understand the technical solutions in the present application, the technical solutions of the embodiments of the present application will be described clearly and completely hereinafter, in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All the other embodiments obtained by those skilled in the art based on the embodiments in the present application without any creative efforts fall into the scope of protection of the present application.

[0034] It should be noted that when an element is referred to be "fixed to" or "provided on"
another element, the element may be directly on the another element or indirectly on the another element; when an element is referred to be "connected to" another element, the element may be directly connected to the other element or indirectly connected to the another element.

[0035] It should be noted that the orientation or positional relationship indicated by the terms, such as "length", "width", "upper", "lower", "front", "rear", "first", "second", "perpendicular", "horizontal", "top", "bottom", "inner", and "outer", are based on the orientation or positional relationship shown in the drawings, which are only used to facilitate the description of the present application and to simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or can only be configured and operated in a particular orientation. Therefore the above terms should not be construed as a limitation to the present application.

[0036] Furthermore, the terms "first", "second" and the like are for purpose of description, 301097307.2 and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined by "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" or "plurality of" is two or more, unless specifically defined otherwise.

[0037] The structure, proportion, and size shown in the drawings of the specification are only used for cooperation with the contents disclosed in the specification to facilitate understanding and reading for those skilled in the art, and are not intend to limit the conditions under which the present application can be implemented, therefor they have no technically substantive meaning. Any modification of structure, change of proportional relationship, or adjustment of size without affecting the effects and purpose of the present application should still fall within the scope of the technical content disclosed in the present application.

[0038] As shown in FIG. 1 to FIG. 9, a large-diameter combinatorial hammer according to the present application includes a base 8, a first joint 1 connected to a drill pipe, a first fixing plate 2 sleeved onto the first joint 1, a first barrel body 3 detachably connected to the first fixing plate 2, a second barrel body 4 connected to the first barrel body 3, a second fixing plate 5 being provided on the second barrel body 4, and a reinforcing assembly 6 connected to the first fixing plate 2 and the second fixing plate 5 respectively. The reinforcing assembly 6 is connected to the first joint 1, at least two hammer units 7 are provided in the second barrel body 4, a fixing plate assembly 12 is provided between the base 8 and the second fixing plate 5, and the hammer units 7 each passes through the fixing plate assembly 12.

[0039] Compared with the conventional technology, with the large-diameter combinatorial hammer according to the present application, the first barrel body 3 is provided in addition to the second barrel body 4, so that the axial length of the whole large-diameter combinatorial hammer is extended, to avoid rock slag falling into the hole before the hole is formed, thereby ensuring a high perpendicularity in hole formation. On the other hand, the reinforcing assembly 6 is provided inside the first barrel body 3, so that in the large-diameter combinatorial hammer, not only the second fixing plate 5 is connected to the first barrel body 3, but also the first fixing plate 2 and the second fixing plate 5 are connected through the reinforcing assembly 6 at a middle portion inside the first barrel body 3, so that the first barrel body 3 and the second barrel body 4 can be connected more securely. This arrangement avoids the shaking of the first fixing 301097307.2 plate 2, the first barrel body 3, the second fixing plate 5 and the second barrel body 4 at the connection positions due to the unstable connection, thereby further ensuring high perpendicularity of hole formation. Thirdly, during the drilling process of impacting the rock stratum, the rock stratum exerts a reverse impact force on the hammer units 7, with the arrangement of the fixing plate assembly 12, middle portions of the hammer units 7 are fixed, thereby avoiding the problem of poor perpendicularity of hole formation due to playing of the hammer units 7. In summary, with the large-diameter combinatorial hammer according to the present application, the overall axial length is increased, and the high perpendicularity of hole formation is achieved in the process of drilling in loose rock stratum.

[0040] As shown in FIG. 6, the large-diameter combinatorial hammer in the embodiment of the present application includes a first fixing assembly 11, through which the hammer units 7 are connected to the second fixing plate 5. This arrangement enables the hammer units 7 to be more securely connected to the second fixing plate 5.

[0041] Further, the first fixing assembly 11 includes a first connection member 111 and a clamping seat 112, each of the hammer units includes a second joint 71, the second joint 71 is connected to the clamping seat 112 in a clamping manner, a first pressing member 113 is provided at one end of the first connection member 111, and the first pressing member 113 is arranged above the second fixing plate 5. The first connection member 111 is in threaded connection with the second joint 71 after passing through the second fixing plate 5 and the clamping seat 112. In this embodiment, the clamping seat 112 is connected to the second joint 71 in a clamping manner, and the first connection member 111 is in threaded connection with the second joint 71 after passing through the second fixing plate 5 and the clamping seat 112, so that the clamping seat 112 does not play, thereby avoiding shifting at a position where the second joint 71 and the clamping seat 112 are connected. On the other hand, the first pressing member 113 is used to limit the position between the first connection member 111 and the second fixing plate 5. Preferably, the first pressing member 113 is a nut.
Thus, according to this embodiment, the connection between the hammer units 7 to the second fixing plate 5 more reliable, which prevents the hammer units 7 from falling off the second fixing plate 5.

[0042] Preferably, as shown in FIG. 1 to FIG. 3, the fixing plate assembly 12 includes a third fixing plate 121 and a fourth fixing plate 122 arranged in parallel with each other, and both of which are parallel to the second fixing plate 5. Each of the third fixing plate 121 and the fourth 301097307.2 fixing plate 122 is sleeved on outer walls of the hammer units. With the arrangement of the third fixing plate 121 and the fourth fixing plate 122 and their relative positional relationship with the second fixing plate 5, the hammer units 7 will not shake during operation.

[0043] In an embodiment according to the present application, a draw rod assembly 10 is provided. One end of the draw rod assembly 10 is connected to the base 8, and the other end of the draw rod assembly 10 is connected to the second fixing plate 5. The one end of the draw rod assembly 10 being connected to the base 8 and the other end of the draw rod assembly 10 being connected to the second fixing plate 5. With the effects of the draw rod assembly 10, the base 8 and the second fixing plate 5, one end of each of the hammer units 7 is connected to the second fixing plate 5 and a bottom of each of the hammer units 7 is movably connected to the base 8, which prevents the hammer units 7 from falling off the base 8 in a condition that a drill bit 9 performs reciprocating motion to impact the rock stratum.

[0044] The draw rod assembly 10 includes a draw rod passing through the second fixing plate 5, the fixing plate assembly 12 and the base 8 in sequence, and a second pressing member 101 in threaded connection with one end of the draw rod. A bottom of the second pressing member 101 abuts against the second fixing plate 5, and the other end of the draw rod is in threaded connection with the base 8. Preferably, the number of the draw rod assembly 10 is at least two, thus multiple tensioning forces are applied, so that the relative position between the second fixing plate 5 and the base 8 does not change, thereby the hammer units 7 have more stable structures and less likely to fall off.

[0045] Further, as shown in FIG. 3, the fixing plate assembly 12 includes a fifth fixing plate 123, the fifth fixing plate 123 is provided below the fourth fixing plate 122 and is sleeved on an outer wall of each of the hammer units. The number of fixing plates in the fixing plate assembly 12 may be adjusted according to the length of the hammer units 7, and the fifth fixing plate 123, the fourth fixing plate 122 and the third fixing plate 121 work together so that the hammer units 7 do not shake during operation.

[0046] In an embodiment according to the present application, as shown in FIG.
1 to FIG. 4, the reinforcing assembly 6 has an upper joint portion 61 provided in a plumb direction and connected to the first fixing plate 2, and at least two first reinforcing ribs 62 are provided on an outer wall of the upper joint portion 61, and the first reinforcing ribs 62 are connected to the 301097307.2 first fixing plate 2. With the arrangement of the first reinforcing ribs 62, the connection between the upper joint portion 61 and the first fixing plate 2 is more secure.

[0047] The reinforcing assembly 6 includes a lower joint portion 66 having one end connected to the upper joint portion 61 and the other end connected to the second fixing plate 5. At least two second reinforcing ribs 63 are provided on an outer wall of the lower joint portion 66, and the second reinforcing ribs 63 are connected to the second fixing plate 5.
With the arrangement of the second reinforcing ribs 63, the connection between the lower joint portion 66 and the second fixing plate 5 is more secure.

[0048] The first reinforcing ribs 62 and the second reinforcing ribs 63 are arranged in a staggered manner so that there are multiple reinforcing points on the first fixing plate 2 and the second fixing plate 5, and the reinforcing assembly 6 has multiple reinforcing points in different directions, making the reinforcing assembly 6 has better structure rigidity.

[0049] In another embodiment, at least one of the first reinforcing ribs 62 is aligned with a corresponding one of the second reinforcing ribs 63. In this way, the reinforcing assembly 6 has at least one reinforcing point where the reinforcing forces are in the same direction, so that the first reinforcing ribs 62 and the second reinforcing ribs 63 are connected more securely.

[0050] An avoidance position 64 is provided on a side wall of the lower joint portion 66.
Generally, in order to have a cutting edge at a position near a center of a bottom of the large-diameter combinatorial hammer, at least one hammer unit 7 is mounted near the center of the large-diameter combinatorial hammer, and the hammer unit 7 is mounted on the second fixing plate 5 through a connection member. To avoid interference with the connection member, the avoidance position 64 is provided on the side wall of the lower joint portion 66.

[0051] In an embodiment according to the present application, as shown in FIG.
6 to FIG. 9, a first air passage 100 is provided in the first joint 1, a second air passage 65 is provided in the reinforcing assembly 6, a first through-hole 500 is provided in the second fixing plate 5, and the first air passage 100 is in communication with the second air passage 65, the first through-hole 500 and the hammer units 7 in sequence. The first barrel body 3 is provided in addition to the second barrel body 4, so that the axial length of the whole large-diameter combinatorial hammer is extended, to avoid rock slag falling into the hole before the hole is formed, thereby ensuring high perpendicularity in hole formation. On the other hand, the reinforcing assembly 301097307.2 6 is provided inside the first barrel body 3, so that in the large-diameter combinatorial hammer, not only the second fixing plate 5 is connected to the first barrel body 3, but also the first fixing plate 2 and the second fixing plate 5 are connected through the reinforcing assembly 6 at a middle portion inside the first barrel body 3, so that the first barrel body 3 and the second barrel body 4 can be connected more securely. In addition, the connection of the reinforcing assembly 6 allows the compressed air to flow from the first air passage to the second air passage 65, the first through-hole 500, and directly into the hammer units 7, thus avoiding the loss of the compressed air in circulation. Therefore, with the air distribution structure of the large-diameter combinatorial hammer according to the present application, at the same time of preventing failure or fracture by ensuring good structural rigidity at the connection between the drill pipe and the hammer and the drill pipe and the hammer, the loss of compressed air can be reduced and the rock drilling capacity of the hammer can be improved.

[0052] An outer wall of the first joint 1 is slidingly connected to an inner wall of the reinforcing assembly 6 so that a bottom of the first joint 1 is placed within the second air passage 65. In this way, the compressed air is allowed to flow directly into the reinforcing assembly 6 from the first joint 1. Preferably, lubricating oil may be applied between the outer wall of the first joint 1 and the inner wall of the reinforcing assembly 6, to avoid the compressed air escaping from the reinforcing assembly 6, which reduces the loss of compressed air, thereby increasing the energy conversion efficiency of the large-diameter combinatorial hammer and increasing the rock drilling capacity.

[0053] A third air passage 1123 is provided in the clamping seat, and a fourth air passage 711 is provided in the second joint 71. The fourth air passage 711 is in communication with the first through-hole 500 through the third air passage 1123.

[0054] In this embodiment, the clamping seat 112 is connected to the second joint 71 in a clamping manner, preferably, a bolt is employed to pass through the second fixing plate 5 and the clamping seat 112 to be in threaded connection with the second joint 71, so that the clamping seat 112 does not play, thereby avoiding shifting at a position where the second joint 71 and the clamping seat 112 are connected. On the other hand, while improving the reliability of the connection between the hammer units 7 and the second fixing plate 5 by using the clamping seat 112, the clamping seat 112 is provided with the third air passage 1123 and the second joint 71 is provided with the fourth air passage 711, and the fourth air passage 711 is in 301097307.2 communication with the first through-hole 500 through the third air passage 1123. This arrangement allows the high pressure air to enter the fourth air passage 711 from the clamping seat 112, which reduces the loss of high pressure air, thereby increasing the rock drilling capacity.

[0055] Further, an air chamber 13 is defined by the third fixing plate 121, the second fixing plate 5 and the second barrel body 4, and the air chamber 13 is in communication with the third air passage 1123 and the first through-hole 500 respectively. Connection between the first barrel body 3, the first fixing plate 2, the second barrel body 4 and the second fixing plate 5 may be performed by welding, which avoid the high pressure air flowing out from the gap, and thus the air chamber 13 is highly airtight, which speeds up the flow of high pressure air from the first through-hole 500 to the third air passage 1123, thereby further reducing the loss of high pressure air and increasing the rock drilling capacity.

[0056] Each of the hammer units includes a check valve 72 fitted to a first central hole 712 in the second joint 71, an air distribution seat 73 abutting against the other end of the check valve 72, a piston 74 fitted to the air distribution seat 73, a first air chamber 75 provided between the piston 74 and the air distribution seat 73, and a second air chamber 76 provided between the piston 74 and an end of a drill shank. A drill bit 9 is detachably connected to one end of the hammer unit, the drill bit 9 includes the drill shank. A reciprocating motion of the piston 74 is realized by changing air pressure in the first air chamber 75 and the second air chamber 76, which in turn impacts the drill bit 9, causing the drill bit 9 to impact the rock stratum.

[0057] The high pressure air entering the hammer units to impact the rock stratum is implemented as follows. At the beginning, the check valve 72 is fitted to the first central hole 712 of the second joint 71, the high pressure air enters the drill rig, passes through the first air passage 100, the second air passage 65, the first through-hole 500, the air chamber 13 and then is distributed to each of the hammer units, the high pressure air enters into the hammer unit from the third air passage 1123 and the fourth air passage 711, acts on the check valve 72 and applies a pressure on the check valve 72. The check valve 72 moves downwards, so that the check valve 72 is no longer fitted to the first central hole 712. Since one end of the check valve 72 abuts against the air distribution seat 73, when the high pressure air reaches the second air chamber 76, the air pressure in the second air chamber 76 is greater than the air pressure in the first air chamber 75, thus the piston 74 is pushed to move upwards. When the piston 74 moves 301097307.2 to a position where the piston 74 is fitted to the air distribution seat 73, the air pressure in the first air chamber 75 rises, at which time the air pressure in the first air chamber 75 is greater than the air pressure in the second air chamber 76, and the air pressure in the first air chamber 75 pushes the piston 74 to impact downwards, the end of the piston 74 applies an impact force to an end of the drill bit 9, to drive the drill bit 9 to impact downwards.

[0058] The piston 74 and the drill bit 9 each is provided with an air outlet hole 91, and a lower end of the drill bit 9 is provided with a first air discharge groove 92, which is connected to the air outlet hole 91. In order to speed up the removal of crushed rock slag to avoid the accumulation of crushed rock slag near the drill bit 9, the high pressure air enters through the first central hole 712, bursts the check valve 72 open, and enters the air passage in the air distribution seat 73, flows into the first air chamber 75, then enters the air outlet hole in the piston 74 and the air outlet hole 91 in the drill bit 9, and finally enters the first air discharge groove 92. Since the first air discharge groove 92 is arranged at the lower end of the drill bit 9, the space between the lower end of the drill bit 9 and the bottom of the rock stratum is limited, and the high pressure air has a certain pressure and speed, thus the high pressure air forms a cyclone between the lower end of the drill bit 9 and the bottom of the rock stratum. The cyclone makes the crushed rock slag to be discharged around the drill bit 9, which greatly accelerates the speed of slag discharge and thereby avoiding overheating of the drill bit 9.

[0059] Further, the base 8 is provided with a first slag discharge groove 81, and the first slag discharge groove 81 is in communication with the first air discharge groove 92; the second barrel body 4 is provided with a second slag discharge groove 42, and the second slag discharge groove 42 is in communication with the first slag discharge groove 81; and the first barrel body 3 is provided with a third slag discharge groove 31, the third slag discharge groove 31 is in communication with the second slag discharge groove 42. In this way, the crushed rock slag flows from the first air discharge groove 92 to the first slag discharge groove 81, the second slag discharge groove 42, and the third slag discharge groove 31, which enables the large-diameter combinatorial hammer to discharge the rock slag in time while drilling, avoiding excessive friction between the rock slag and the first barrel body 3, the second barrel body 4 and the base, thereby improving the service life.

[0060] Since the drill bit 9 performs up and down reciprocating motion, and the base 8 is sleeved on the outer wall of the drill bit 9, the base 8 is severely worn after a long period of use, 301097307.2 which increases the gap between the drill bit 9 and the base 8 through which the crushed rock slag may be blown into the second barrel body 4, causing the crushed rock slag to enter the air chamber 13, and finally the crushed rock slag enters the piston 74 inside the hammer unit. Once the crushed rock enters the first air chamber 75 and the second air chamber 76, the piston 74 will get stuck and cannot work. Therefore, a mounting seat 82 is provided in the present application, the mounting seat 82 is sleeved onto the outer wall of the drill bit 9, and then the mounting seat 82 is tightly fitted to the base 8. When the mounting seat 82 is damaged, it can be replaced without replacing the entire base 8, which reduces the maintenance cost of the large-diameter combinatorial hammer while ensuring the service performance of the large-diameter combinatorial hammer.

[0061] It should be noted that the following improvements are made to reduce manufacturing costs. With regard to the formation of the third slag discharge groove 31 on the first barrel body 3 and the second slag discharge groove 42 on the second barrel body 4, a slice of the third slag discharge groove 31 and a slice of the second slag discharge groove 42 are cut out of the first barrel body 3 and the second barrel body 4, respectively, and the slices are turned 1800 so that both the opening of the third slag discharge groove 31 and the opening of the second slag discharge groove 42 face outward, and after the parts inside the large-diameter combinatorial hammer are assembled, welding is performed. In this way, the material of the barrel body itself can be used, which reduces the processing costs of the third slag discharge groove 31 and the second slag discharge groove 42, thereby reducing the manufacturing costs of the large-diameter combinatorial hammer.

[0062] A down-the-hole drill rig is provided according to the present application. The down-the-hole drill rig includes the above large-diameter combinatorial hammer, and also has the above effects, which will not be repeated here.

[0063] According to the above description of the disclosed embodiments, those skilled in the art can implement or practice the present application. Various modifications to the embodiments are apparent for those skilled in the art. The general principle defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but should be in accordance with the broadest scope consistent with the principle and novel features disclosed herein.

301097307.2

Claims (10)

1. A large-diarneter cornbinatorial harnrner, cornprising:
a base, a first joint configured to be connected to a drill pipe;
a first fixing plate sleeved onto the first joint;
a first barrel body detachably connected to the first fixing plate;
a second barrel body connected to the first barrel body, wherein a second fixing plate is provided on the second barrel body; and a reinforcing assembly connected to the first fixing plate and the second fixing plate respectively, wherein the reinforcing assernbly is connected to the first joint; and wherein at least two hammer units are provided in the second barrel body, a fixing plate assernbly is provided between the base and the second fixing plate, and the hammer units are each configured to pass through the fixing plate assembly.

2. The large-diarneter cornbinatorial hammer according to clairn 1, further cornprising a first fixing assembly, wherein the harnrner units are connected to the second fixing plate through the first fixing assembly.

3. The large-diarneter combinatorial hammer according to clairn 2, wherein the first fixing assembly cornprises a first connection member and a clarnping seat; wherein each of the hammer units comprises a second joint, the second joint is connected to the clamping seat in a clarnping manner, a first pressing rnember is provided at one end of the first connection member, and the first pressing member is arranged above the second fixing plate;
and the first connection mernber passes through the second fixing plate and the clarnping seat to be in threaded connection with the second joint.

4. The large-diameter combinatorial hammer according to claim 3, further comprising a draw rod assembly, wherein one end of the draw rod assembly is connected to the base, and the other end of the draw rod assembly is connected to the second fixing plate.

5. The large-diameter combinatorial hammer according to claim 4, wherein the draw rod assembly comprises:
a draw rod passing through the second fixing plate, the fixing plate assembly and the base in sequence; and a second pressing member in threaded connection with one end of the draw rod, wherein a bottom of the second pressing member abuts against the second fixing plate, and the other end of the draw rod is in threaded connection with the base.

6. The large-diameter combinatorial hammer according to claim 1, wherein the reinforcing assembly has an upper joint portion provided in a plumb direction and connected to the first fixing plate; and wherein at least two first reinforcing ribs are provided on an outer wall of the upper joint portion, and the at least two first reinforcing ribs are connected to the first fixing plate.

7. The large-diameter combinatorial hammer according to claim 6, wherein the reinforcing assembly further cornprises a lower joint portion having one end connected to the upper joint portion and the other end connected to the second fixing plate; and at least two second reinforcing ribs are provided on an outer wall of the lower joint portion, and the at least two second reinforcing ribs are connected to the second fixing plate.

8. The large-diameter combinatorial hammer according to claim 3, wherein a first air passage is provided in the first joint, a second air passage is provided in the reinforcing assembly, a first through-hole is provided in the second fixing plate, wherein the first air passage is in communication with the second air passage, the first through-hole and the hammer units in sequence.

9. The large-diameter combinatorial hammer according to claim 8, wherein a third air passage is provided in the clamping seat, a fourth air passage is provided in the second joint, and the fourth air passage is in communication with the first through-hole through the third air passage.

10. A down-the-hole drill rig, comprising the large-diameter combinatorial hammer according to any one of claims 1 to 9.