WO2022105343A1 - 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

A large-diameter combined impactor and down-the-hole drilling rig

This application claims the priority of the Chinese patent application filed on November 23, 2020 with the application number 202011320910.X and the invention name "A large diameter combined impactor and down-the-hole drilling rig", the entire contents of which are approved by Reference is incorporated in this application.

technical field

The application relates to the field of mining machinery and equipment, in particular to a large-diameter combined impactor, and also to a down-the-hole drilling rig.

Background technique

Underground pipelines are an important part of urban infrastructure, including water supply, drainage, gas, heat, electricity, industrial pipelines and other categories. Due to the requirements for the protection of ground buildings and construction efficiency, more and more urban underground pipelines are laid using horizontal directional drilling technology. The horizontal directional drilling technology is to use the drilling equipment on the surface to drill into the bottom layer at a small incident angle relative to the ground to form a pilot hole, and then gradually expand the pilot hole diameter to the required size, and lay the pipeline. of a technology. The geological layers constructed by horizontal directional drilling rigs mainly include two categories: soft soil layers and complex strata.

For the trenchless pipe laying construction of horizontal directional drilling rigs in soft soil layers, due to the low hardness of the stratum and a long development history, the development of steering and reaming construction equipment is relatively complete at present. For pilot holes, it is generally possible to use an oblique drill bit. For hole reaming construction, there are currently wing-shaped, spiral-shaped and groove-shaped drill bits. These drill bits have a complete range of models and high construction efficiency. By selecting drill bits with different diameters for step-by-step reaming, the expansion of large-diameter pipelines in soft soil layers can be realized. hole requirements.

For the trenchless pipe-laying construction of horizontal directional drilling rigs in complex formations such as rock and gravel, due to the technical difficulty and less research, there are many problems during construction.

With the continuous development of the economy, the rapid growth of the population and the continuous acceleration of the urbanization process, the diameter requirements of the underground pipelines are also increasing, and the demand for large-diameter reaming equipment is increasingly urgent. However, by increasing the diameter of the reaming pneumatic impactor to increase the diameter of the reaming line in complex formations such as rock and gravel, it will show the following shortcomings:

The rock drilling capacity of the impactor mainly depends on the impact force of the impactor on the rock formation. The impact force comes from compressed air. In order to reduce the loss of compressed air, the distance between the drill pipe and the impact unit is usually shortened. The diameter is large (500mm-3000mm), the axial length is relatively short, and the axial length is relatively short, especially in the process of drilling loose rock layers, it is more likely to have poor verticality of the holes.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the application provides a large-diameter combined impactor, which increases the overall axial length, and during the drilling process of the loose rock layer, the hole forming verticality is high, and the application also provides a down-the-hole drilling rig, which uses The aforementioned large-diameter combined impactor also has the aforementioned beneficial effects.

The technical solutions provided by this application are as follows:

A large-diameter combined impactor includes a base,

the first joint connected with the drill pipe;

a first fixing plate sleeved on the first joint;

a first cylinder detachably connected to the first fixing plate;

a second cylinder connected to the first cylinder, a second fixing plate is provided on the second cylinder;

and a reinforcing assembly respectively connecting the first fixing plate and the second fixing plate, the reinforcing assembly is connected with the first joint;

At least two impact units are arranged in the second cylinder, a fixing plate assembly is arranged between the base and the second fixing plate, and the impact unit passes through the fixing plate assembly.

Preferably, a first fixing assembly is included, and the impact unit is connected with the second fixing plate through the first fixing assembly.

Preferably, the first fixing assembly includes a first connector and a snap seat;

The impactor unit includes a second joint, the second joint is clamped with the clamping seat, one end of the first connecting piece is provided with a first pressing piece, and the first pressing piece is arranged on the Above the second fixing plate;

After passing through the second fixing plate and the clamping seat, the first connecting piece is screwed and connected with the second joint.

Preferably, a pull rod assembly is included, one end of the pull rod assembly is connected to the base, and the other end of the pull rod assembly is connected to the second fixing plate.

Preferably, the tie rod assembly comprises a tie rod passing through the second fixing plate, the fixing plate assembly and the base in sequence;

and a second pressing member threadedly connected to one end of the tie rod, the bottom of the second pressing member abuts the second fixing plate, and the other end of the tie rod is threadedly connected to the base.

Preferably, the reinforcing component is provided with an upper connecting portion connected to the first fixing plate along the vertical direction;

At least two first reinforcing ribs are arranged on the outer wall of the upper connecting portion, and the first reinforcing ribs are connected with the first fixing plate.

Preferably, the reinforcement assembly includes a lower connection part connected to the upper connection part at one end and connected to the second fixing plate at the other end;

At least two second reinforcing ribs are arranged on the outer wall of the lower connecting portion, and the second reinforcing ribs are connected with the second fixing plate.

Preferably, a first air passage is arranged in the first joint, a second air passage is arranged in the reinforcing component, a first through hole is formed on the second fixing plate, and the first air passage is connected with the The second air passage, the first through hole, and the impact unit communicate with each other.

Preferably, a third air passage is provided on the card holder, a fourth air passage is provided on the second joint, and the fourth air passage communicates with the first through hole through the third air passage.

A down-the-hole drilling rig includes the above-mentioned large-diameter combined impactor.

Compared with the prior art, a large-diameter combined impactor provided by the present invention is provided with a first cylindrical body on the basis of the second cylindrical body, so that the axial length of the entire large-diameter combined impactor is lengthened to avoid hole formation. Before forming, the rock slag falls into the hole to ensure that the verticality of the hole is high. On the other hand, a reinforcement assembly is arranged inside the first cylinder, so that the large-diameter combined impactor can not only be connected to the first cylinder through the second fixing plate, but also inside the first cylinder, through the reinforcement assembly, The first fixing plate and the second fixing plate can also be connected in the middle position, so that the connection between the first cylinder and the second cylinder is more stable. Avoid shaking at the connection position between the first fixing plate, the first cylinder, the second fixing plate and the second cylinder due to the unstable connection, and further ensure that the verticality of the hole is high. Third, during the drilling process of the impacting rock formation, the rock formation will exert a reverse impact force on the impacting unit, and the setting of the fixed plate assembly will make the middle position of the impacting unit fixed, preventing the impacting unit from jumping and making the hole vertical Poor degree problem. To sum up, the large-diameter combined impactor provided by the present application increases the overall axial length, and during the drilling process of the loose rock layer, the hole-forming verticality is high.

The present application also provides a down-the-hole drilling rig, which applies the above-mentioned large-diameter combined impactor, and also has the above-mentioned beneficial effects.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic diagram of the internal structure of a large-diameter combined impactor provided by an embodiment of the present invention;

2 is a schematic structural diagram of a large-diameter combined impactor provided with a second cylinder body provided in an embodiment of the present invention;

3 is a schematic structural diagram of a reinforcement assembly provided by an embodiment of the present invention;

4 is an exploded view of a reinforcement assembly provided by an embodiment of the present invention;

5 is an exploded view of the fixing plate assembly and the tie rod assembly provided by the embodiment of the present invention;

6 is a cross-sectional view of a large-diameter combined impactor provided by an embodiment of the present invention;

7 is a cross-sectional view of a large-diameter combined impactor provided by an embodiment of the present invention;

8 is a schematic diagram of an impact unit provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of the external structure of the gas distribution structure of the large-diameter combined impactor provided by the embodiment of the present invention.

Description of reference numerals: 1. The first joint; 2. The first fixing plate; 3. The first cylinder; 31. The third slag discharge tank; 4. The second cylinder; second fixing plate; 500, first through hole; 6, reinforcing assembly; 61, upper connecting part; 62, first reinforcing rib; 63, second reinforcing rib; 64, avoidance position; 65, second airway; 66 7, the lower part; 7, the impact unit; 71, the second joint; 711, the fourth air passage; 712, the first center hole; 72, the check valve; 73, the valve seat; 74, the piston; 75, the first Air chamber; 76, second air chamber; 8, base; 81, first slag discharge groove; 82, mounting seat; 9, drill bit; 91, air outlet; 92, first exhaust groove; 10, tie rod assembly; 100 101, the second pressing piece; 11, the first fixing component; 111, the first connecting piece; 112, the snap seat; 113, the first pressing piece; 114, the third cylinder; 1123 12, the fixed plate assembly; 121, the third fixed plate; 122, the fourth fixed plate; 123, the fifth fixed plate; 13, the air cavity.

Detailed ways

In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described implementation The examples are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that when an element is referred to as being "fixed" or "disposed on" another element, it can be directly or indirectly disposed on the other element; when an element is referred to as being "connected" "to" another element, it may be directly connected to another element or indirectly connected to another element.

It is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top" "," "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying the indicated A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of this application, "a plurality" and "several" mean two or more, unless otherwise expressly and specifically defined.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of those who are familiar with this technology, and are not used to limit the conditions that the application can implement. Therefore, it has no technical substantive significance. Any structural modification, proportional relationship change or size adjustment should still fall within the scope of the disclosure in this application, without affecting the effect that the application can produce and the purpose that can be achieved. The technical content must be covered.

As shown in FIGS. 1 to 9 , a large-diameter combined impactor provided by the present invention includes a base 8 , a first joint 1 connected with the drill pipe, and a first fixing plate 2 sleeved on the first joint 1 . , the first cylinder 3 detachably connected with the first fixing plate 2, the second cylinder 4 connected with the first cylinder 3, the second cylinder 4 is provided with a second fixing plate 5, and the first cylinder 4 is connected to the first cylinder 4 respectively. The reinforcing assembly 6 of the fixing plate 2 and the second fixing plate 5, the reinforcing assembly 6 is connected with the first joint 1, at least two impact units 7 are arranged in the second cylinder 4, and between the base 8 and the second fixing plate 5 There is a fixed plate assembly 12 through which the impact unit 7 passes.

Compared with the prior art, a large-diameter combined impactor provided by the present invention is provided with a first cylindrical body 3 on the basis of the second cylindrical body 4, so that the axial length of the entire large-diameter combined impactor is lengthened, avoiding When the hole is not formed, the rock slag falls into the hole to ensure that the verticality of the hole is high. On the other hand, a reinforcement assembly 6 is arranged inside the first cylinder 3 , so that the large-diameter combined impactor can not only be connected to the first cylinder 3 through the second fixing plate 5 , but also inside the first cylinder 3 , through the reinforcement assembly 6, the first fixing plate 2 and the second fixing plate 5 can also be connected in the middle position, so that the connection between the first cylinder 3 and the second cylinder 4 is more stable. Avoid shaking at the connection position between the first fixing plate 2 , the first cylinder 3 , the second fixing plate 5 and the second cylinder 4 due to unstable connection, and further ensure that the verticality of the hole is high. Third, during the drilling process of the impacting rock formation, the rock formation will apply a reverse impact force to the impacting unit 7, and the setting of the fixing plate assembly 12 will make the middle position of the impacting unit 7 fixed, so as to prevent the impacting unit 7 from jumping and causing damage to the impact unit 7. The problem of poor verticality of holes. To sum up, the large-diameter combined impactor provided by the present application increases the overall axial length, and during the drilling process of the loose rock layer, the hole-forming verticality is high.

Among them, as shown in FIG. 6 , the large-diameter combined impactor in this embodiment includes a first fixing component 11 , and through the first fixing component 11 , the impact unit 7 is connected with the second fixing plate 5 . This makes the connection between the impact unit 7 and the second fixing plate 5 more stable.

Further, the first fixing assembly 11 includes a first connector 111 and a snap seat 112 , the impactor unit includes a second joint 71 , the second connector 71 is snapped with the snap seat 112 , and one end of the first connector 111 is provided with a first connector 71 . A pressing member 113 is provided above the second fixing plate 5 ; the first connecting member 111 is screwed to 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 clamped with the second connector 71 , and the first connector 111 is screwed to the second connector 71 after passing through the second fixing plate 5 and the clamping seat 112 , so that the clamping seat is The 112 will not jump, so that the position where the second connector 71 is connected to the engaging seat 112 will not be offset. On the other hand, the first pressing member 113 is used to limit the position between the first connecting member 111 and the second fixing plate 5 . Preferably, the first pressing member 113 is a nut. Therefore, this embodiment makes the connection between the impact unit 7 and the second fixing plate 5 more reliable, and prevents the impact unit 7 from falling off from the second fixing plate 5 .

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 which are arranged parallel to each other. The fixing plates 5 are parallel, and both the third fixing plate 121 and the fourth fixing plate 122 are sleeved on the outer wall of the impactor unit. The arrangement of the third fixing plate 121 , the fourth fixing plate 122 and the relative positional relationship with the second fixing plate 5 prevent the impact unit 7 from shaking during operation.

In the embodiment provided by the present invention, a pull rod assembly 10 is included, one end of the pull rod assembly 10 is connected to the base 8 , and the other end of the pull rod assembly 10 is connected to the second fixing plate 5 . One end of the pull rod assembly 10 is connected to the base 8 , and the other end is connected to the second fixing plate 5 . Through the functions of the above three, one end of the impact unit 7 is connected to the second fixing plate 5, and the bottom of the impact unit 7 is movably connected to the base 8. Under the condition that the reciprocating motion of the drill bit 9 impacts the rock formation, the impact unit 7 can be avoided from the base. 8 falls off.

Wherein, the pull rod assembly 10 includes a pull rod passing through the second fixing plate 5, the fixing plate assembly 12, the base 8 in sequence, and a second pressing member 101 threadedly connected with one end of the pulling rod. The bottom of the second pressing member 101 abuts against the first Two fixing plates 5, the other end of the pull rod is screwed and connected with the base 8. Preferably, there are at least two pull rod assemblies 10, and multiple tensioning forces are applied, so that the relative position of the second fixing plate 5 and the base 8 does not change, so that the structure of the impact unit 7 is more stable and less likely to fall off.

Further, as shown in FIG. 3 , the fixing plate assembly 12 includes a fifth fixing plate 123 . The fifth fixing plate 123 is disposed below the fourth fixing plate 122 and sleeved on the outer wall of the impactor unit. The number of fixing plates set in the fixing plate assembly 12 can be adjusted according to the length of the impact unit 7. The fifth fixing plate 123, the fourth fixing plate 122 and the third fixing plate 121 work together so that the impact unit 7 does not work during operation. Shaking will occur.

In the embodiment provided by the present invention, as shown in FIG. 1 to FIG. 4 , the reinforcing component 6 is provided with an upper connecting portion 61 connected to the first fixing plate 2 along the vertical direction, and the outer wall of the upper connecting portion 61 is provided with at least The two first reinforcing ribs 62 are connected with the first fixing plate 2 . The arrangement of the first reinforcing rib 62 makes the connection between the upper connecting portion 61 and the first fixing plate 2 more stable.

The reinforcement assembly 6 includes a lower connection part 66 whose one end is connected to the upper connection part 61 and the other end is connected to the second fixing plate 5 . At least two second reinforcement ribs 63 are provided on the outer wall of the lower connection part 66 . 63 is connected to the second fixing plate 5 . The arrangement of the second reinforcing ribs 63 makes the connection between the lower connecting portion 66 and the second fixing plate 5 more stable.

Wherein, the first reinforcing rib 62 and the second reinforcing rib 63 are staggered, so that the first fixing plate 2 and the second fixing plate 5 have a plurality of reinforcing points, and the reinforcing component 6 has a plurality of reinforcing points in different directions, so that the reinforcement The structural rigidity of the assembly 6 is better.

In another embodiment, at least one first reinforcing rib 62 is aligned with the second reinforcing rib 63 . In this way, the reinforcing component 6 has at least one reinforcing point in the same direction of the reinforcing force, so that the connection between the first reinforcing rib 62 and the second reinforcing rib 63 is more stable.

Wherein, an escape position 64 is provided on the side wall of the lower connecting portion 66 . Usually, in order to make the bottom of the large-diameter combined impactor have a cutting edge near the middle position, at least one impact unit 7 will be installed near the center of the large-diameter combined impactor, and the impact unit 7 will be installed on the second fixed by using a connector On the board 5 , in order to avoid the connecting piece, an avoidance position 64 is provided on the side wall of the lower connecting part 66 .

In the embodiment provided by the present invention, as shown in FIGS. 6 to 9 , the first joint 1 is provided with a first air passage 100 , the reinforcing component 6 is provided with a second air passage 65 , and the second fixing plate 5 is provided with a first air passage 100 . There is a first through hole 500 , and the first air passage 100 communicates with the second air passage 65 , the first through hole 500 and the impact unit 7 in sequence. On the basis of the second cylinder 4, the first cylinder 3 is arranged to lengthen the axial length of the entire large-diameter combined impactor, so as to prevent the rock slag from falling into the hole when the hole is not formed, and to ensure that the hole is vertical. On the other hand, a reinforcement assembly 6 is arranged inside the first cylinder 3, so that the large-diameter combined impactor can not only be connected to the first cylinder 3 through the second fixing plate 5, but also can be connected to the first cylinder Inside the body 3 , the first fixing plate 2 and the second fixing plate 5 can also be connected in the middle position through the reinforcement assembly 6 , so that the connection between the first cylinder 3 and the second cylinder 4 is more stable. In addition, using the connection relationship of the reinforcement assembly 6, the compressed gas flows from the first channel to the second gas channel 65 and the first through hole 500, and directly enters the impact unit 7, thereby avoiding the loss of compressed gas in circulation. Therefore, the gas distribution structure of the large-diameter combined impactor provided by the present application can ensure that the joint between the drill pipe and the impactor has good structural rigidity and is not prone to failure and fracture, and at the same time, it can also reduce the loss of compressed air and improve the rock drilling capacity of the impactor. .

Wherein, the outer wall of the first joint 1 is slidably connected with the inner wall of the reinforcement assembly 6 , so that the bottom of the first joint 1 is placed in the second air passage 65 . In this way, the compressed air can flow out from the first joint 1 and directly enter the reinforcement assembly 6. Preferably, lubricating oil can be applied between the outer wall of the first joint 1 and the inner wall of the reinforcement assembly 6 to prevent the compressed air from flowing from the reinforcement assembly 6. It can escape from the inside, reduce the loss of compressed air, improve the energy conversion efficiency of the large-diameter combined impactor, and then improve its rock drilling capacity.

Wherein, a third air passage 1123 is provided on the card seat, a fourth air passage 711 is provided on the second joint 71 , and the fourth air passage 711 communicates with the first through hole 500 through the third air passage 1123 .

In this embodiment, the clamping seat 112 is clamped with the second joint 71. Preferably, bolts can be selected to pass through the second fixing plate 5 and the clamping seat 112, and then screwed and connected with the second joint 71, so that the clamping connection is made. The seat 112 does not jump, so that the position where the second connector 71 is connected to the engaging seat 112 does not shift. On the other hand, while using the snap seat 112 to improve the reliability of the connection between the impact unit 7 and the second fixing plate 5 , a third air channel 1123 is provided on the snap seat 112 and a fourth air channel is provided on the second joint 71 The fourth air channel 711 communicates with the first through hole 500 through the third air channel 1123 . The high-pressure gas can be made to enter the fourth air passage 711 from the clamping seat 112, the loss of the high-pressure gas can be reduced, and the rock drilling capacity can be improved.

Further, an air cavity 13 is enclosed between the third fixing plate 121 , the second fixing plate 5 and the second cylinder 4 , and the air cavity 13 communicates with the third air passage 1123 and the first through hole 500 respectively. Wherein, the connection between the first cylinder 3 , the first fixing plate 2 , the second cylinder 4 and the second fixing plate 5 can be welded to prevent the high-pressure gas from flowing out of the gap, so that the airtightness of the air cavity 13 is high. , to speed up the flow rate of the high-pressure gas from the first through hole 500 to the third air passage 1123, again reducing the loss of the high-pressure gas and improving the rock drilling capacity.

The impact unit includes a check valve 72 matched with the first central hole 712 in the second joint 71 , a gas distribution seat 73 abutting against the other end of the check valve 72 , and a piston 74 matched with the gas distribution seat 73 . , the first air chamber 75 is arranged between the piston 74 and the gas distribution seat 73, the second air chamber 76 is arranged between the piston 74 and the end of the drill shank, one end of the impact unit is detachably connected with a drill bit 9, and the drill bit 9 includes a drill bit. The shank is changed by the air pressure in the first air chamber 75 and the second air chamber 76 to realize the up and down reciprocating motion of the piston 74, and then impact the drill bit 9, so that the drill bit 9 impacts the rock formation.

How high-pressure gas enters the impact unit to impact the rock formation, specifically, at the beginning, the check valve 72 is matched with the first central hole 712 of the second joint 71, the high-pressure gas of the drilling rig, the first air passage 100, the second air passage 65, The first through hole 500 and the air cavity 13 are redistributed to each impact unit. The high-pressure gas enters the impact unit from the third air passage 1123 and the fourth air passage 711. The high-pressure gas acts on the check valve 72 and supplies the check valve. 72 exerts pressure, the check valve 72 moves downward, so that the check valve 72 is no longer matched with the first central hole 712, because one end of the check valve 72 abuts against the gas distribution seat 73, when the high-pressure gas reaches the second gas chamber 76 , the air pressure in the second air chamber 76 is greater than the air pressure in the first air chamber 75, then push the piston 74 to move upward, when the piston 74 moves to the air distribution seat 73 to match, the air pressure in the first air chamber 75 rises, At this 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 downward, and the end of the piston 74 exerts an impact force on the end of the drill bit 9, and the drill bit 9 Do the impact motion downwards.

The piston 74 and the drill bit 9 are provided with air outlet holes 91 , and the lower end of the drill bit 9 is provided with a first air outlet groove 92 , and the first air outlet groove 92 communicates with the air outlet hole 91 . In order to speed up the removal of the crushed rock slag and prevent the crushed rock slag from accumulating near the drill bit 9, the high-pressure gas enters from the first central hole 712, flushes the check valve 72, enters the air passage on the gas distribution seat 73, and flows into the first central hole 712. After the air chamber 75, it enters the piston 74 and the air outlet 91 in the drill bit 9, and finally enters the first exhaust groove 92. Since the first exhaust groove 92 is arranged at the lower end of the drill bit 9, the lower end of the drill bit 9 is connected to the bottom of the rock formation. The space between them is limited, the high-pressure gas has a certain pressure and speed, and then the high-pressure gas forms a cyclone between the lower end of the drill bit 9 and the bottom of the rock formation, and the cyclone makes the crushed rock slag discharge around the drill bit 9, which greatly speeds up the slag discharge speed, Avoid overheating of the drill 9.

Further, the base 8 is provided with a first slag discharge groove 81, which communicates with the first exhaust groove 92; the second cylinder 4 is provided with a second slag discharge groove 42, and the second slag discharge groove 42 communicates with the first slag discharge groove 81 ; the first cylinder 3 is provided with a third slag discharge groove 31 , and the third slag discharge groove 31 communicates with the second slag discharge groove 42 . Through the above arrangement, the broken rock slag flows from the first exhaust groove 92 to the first slag discharge groove 81, the second slag discharge groove 42 and the third slag discharge groove 31, so that the large-diameter combined impactor is drilled while drilling. The rock slag can also be discharged in time to avoid transition friction between the rock slag and the first cylinder body 3, the second cylinder body 4 and the base, thereby improving its service life.

Among them, because the drill bit 9 reciprocates up and down, the base 8 is sleeved on the outer wall of the drill bit 9. After a long time of use, the base 8 is seriously worn, so that the gap between the drill bit 9 and the base 8 increases, and the broken rock slag can pass from the gap. Blow into the second cylinder 4, so that the crushed rock slag enters the air cavity 13, and finally the crushed rock slag will enter the piston 74 in the impact unit. Once the first air chamber 75 and the second air chamber 76 enter the crushed rock slag, This will cause the piston 74 to be stuck and unable to work. Therefore, in the present application, a mounting seat 82 is provided, the mounting seat 82 is sleeved on the outer wall of the drill bit 9, and then the mounting seat 82 is tightly fitted with the base 8. When the mounting seat 82 is damaged, the mounting seat 82 can be replaced without requiring the entire base 8 Replacement, while ensuring the performance of the large-diameter combined impactor, the maintenance cost of the large-diameter combined impactor is reduced.

It should be noted that the improvements made in reducing the manufacturing cost include, regarding the formation of the third slag discharge groove 31 on the first cylinder 3 and the second slag discharge groove 42 on the second cylinder 4, the first cylinder 3. The sheet body of the third slag discharge slot 31 and the second slag discharge slot 42 is cut out on the second cylinder 4, and the sheet body is rotated 180°, so that the third slag discharge slot 31 and the second slag discharge slot 42 With the opening to the outside, the parts inside the large-diameter combined impactor are assembled and then welded. In this way, local materials can be obtained, the processing cost of the third slag discharge groove 31 and the second slag discharge groove 42 can be reduced, and the manufacturing cost of the large-diameter combined impactor can be reduced.

The present invention provides a down-the-hole drilling rig, including the above-mentioned large-diameter combined impactor, which also has the above-mentioned effects, and will not be repeated here.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A large-diameter combined impactor is characterized in that it comprises a base,

   the first joint connected with the drill pipe;

   a first fixing plate sleeved on the first joint;

   a first cylinder detachably connected to the first fixing plate;

   a second cylinder connected to the first cylinder, a second fixing plate is provided on the second cylinder;

   and a reinforcing assembly respectively connecting the first fixing plate and the second fixing plate, the reinforcing assembly is connected with the first joint;

   At least two impact units are arranged in the second cylinder, a fixing plate assembly is arranged between the base and the second fixing plate, and the impact unit passes through the fixing plate assembly.
2. The large-diameter combined impactor according to claim 1, characterized in that it comprises a first fixing component, and through the first fixing component, the impact unit is connected with the second fixing plate.
3. The large-diameter combined impactor according to claim 2, wherein the first fixing component comprises a first connecting piece and a snap seat;

   The impactor unit includes a second joint, the second joint is clamped with the clamping seat, one end of the first connecting piece is provided with a first pressing piece, and the first pressing piece is arranged on the Above the second fixing plate;

   After passing through the second fixing plate and the clamping seat, the first connecting piece is screwed and connected with the second joint.
4. The large-diameter combined impactor according to claim 3, characterized in that it comprises a pull rod assembly, one end of the pull rod assembly is connected to the base, and the other end of the pull rod assembly is connected to the second fixing plate.
5. The large-diameter combined impactor according to claim 4, wherein the pull rod assembly comprises a pull rod passing through the second fixing plate, the fixing plate assembly and the base in sequence;

   and a second pressing member threadedly connected to one end of the tie rod, the bottom of the second pressing member abuts the second fixing plate, and the other end of the tie rod is threadedly connected to the base.
6. The large-diameter combined impactor according to claim 1, wherein the reinforcing component is provided with an upper connecting portion connected to the first fixing plate along the vertical direction;

   At least two first reinforcing ribs are arranged on the outer wall of the upper connecting portion, and the first reinforcing ribs are connected with the first fixing plate.
7. The large-diameter combined impactor according to claim 6, wherein the reinforcing component comprises a lower connecting portion, one end of which is connected to the upper connecting portion, and the other end is connected to the second fixing plate;

   At least two second reinforcing ribs are arranged on the outer wall of the lower connecting portion, and the second reinforcing ribs are connected with the second fixing plate.
8. The large-diameter combined impactor according to claim 3, wherein a first air passage is arranged in the first joint, a second air passage is arranged in the reinforcing assembly, and a second air passage is arranged on the second fixing plate. There is a first through hole, and the first air passage communicates with the second air passage, the first through hole, and the impact unit in sequence.
9. The large-diameter combined impactor according to claim 8, wherein a third air passage is provided on the clamping seat, a fourth air passage is provided on the second joint, and the fourth air passage passes through the The third air passage communicates with the first through hole.
10. A down-the-hole drilling rig is characterized by comprising the large-diameter combined impactor according to any one of claims 1 to 9.

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