Positive circulation deslagging auxiliary device for large-diameter down-the-hole hammer

Abstract

The invention discloses a positive circulation deslagging auxiliary device for a large-diameter down-the-hole hammer. The positive circulation deslagging auxiliary device comprises a telescopic cylinder, a first connecting assembly and a second connecting assembly. The telescopic cylinder body comprises a plurality of layers of cylinder bodies which are mutually nested, and the adjacent cylinder bodies are telescopic; the barrel is hollow and vertically through, and a drill rod for driving the down-the-hole hammer can penetrate through the barrel; the first connecting assembly is arranged at the free end of the outermost layer of the telescopic cylinder and used for being connected with a drilling machine power head. The second connecting assembly is arranged at the free end of the innermost layer of the telescopic cylinder and used for being connected with a down-the-hole hammer. When the drilling machine drills, the down-the-hole hammer continuously descends, and the telescopic cylinder is driven by the down-the-hole hammer to extend downwards; after the drilling machine finishes drilling, the down-the-hole hammer is lifted up, and the telescopic cylinder body retracts along with the down-the-hole hammer. By means of the auxiliary device, during drilling operation, a small annular gap can be formed between the telescopic cylinder and the hole wall, favorable conditions are provided for direct circulation deslagging, meanwhile, a large-diameter drill rod can be prevented from being used, the weight of the drill rod is reduced, and the machining cost is lower.

Description

Technical Field

[0001] The invention relates to the field of engineering technology, and in particular to a positive circulation slag removal auxiliary device for a large-diameter down-the-hole hammer. Background Art

[0002] Conventional small-diameter down-the-hole hammers usually use a positive circulation method for deslagging, that is, air is supplied to the down-the-hole hammer through the drill pipe, and then the air is discharged upward from the annular space between the drill pipe and the borehole. The faster the air returns, the better the deslagging effect.

[0003] Generally speaking, when the air flow rate of positive cycle slag removal is fixed, the smaller the annular gap is, the faster the air return speed is, and the better the slag removal effect is. When the size of the annular gap is fixed, the larger the air flow rate is, the faster the air return speed is, and the better the slag removal effect is. Therefore, in order to ensure the effect of positive cycle slag removal, it can be achieved by increasing the outer diameter of the drill pipe to reduce the annular gap or increase the air flow rate.

[0004] The diameter of the large-diameter down-the-hole hammer currently used by rotary drilling rigs is usually above 500mm. Special large-diameter drill rods are usually used to minimize the gap between the drill rod and the borehole. The drill rods are connected in sections to achieve different drilling depth requirements. However, due to the large weight of the large-diameter drill rod, the lifting force of the drill rig is high and it is not suitable for deeper drilling. At the same time, the processing cost of large-diameter drill rods is high. Currently, it is usually only suitable for down-the-hole hammer construction with a diameter of less than 1000mm. The construction of larger-diameter down-the-hole hammers is more inclined to reverse circulation slag removal and drill lifting and slag removal. However, both have problems such as difficulty in equipment manufacturing and processing, high supporting costs, and inconvenient operation, which need to be further improved. Summary of the invention

[0005] The purpose of the present invention is to provide a positive circulation slag removal auxiliary device for a large-diameter down-the-hole hammer, a telescopic cylinder is arranged on the outside of the drill pipe, and a first connecting assembly and a second connecting assembly are provided at the upper and lower ends of the telescopic cylinder for connecting the drilling rig power head and the down-the-hole hammer respectively. When drilling, a small annular space gap is formed between the telescopic cylinder and the hole wall, which provides favorable conditions for positive circulation slag removal. At the same time, it can avoid the use of large-diameter drill pipes, reduce the weight of the drill pipes, and reduce processing costs.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a positive circulation slag removal auxiliary device for a large-diameter down-the-hole hammer, comprising: a telescopic cylinder, a first connecting assembly and a second connecting assembly; the telescopic cylinder comprises multiple layers of cylinders nested in each other, and adjacent cylinders are telescopic; the cylinder is hollow inside and penetrates vertically, and can penetrate a drill rod that drives the down-the-hole hammer; the first connecting assembly is disposed at the free end of the outermost cylinder of the telescopic cylinder, and is used to be connected to a power head of a drilling rig; the second connecting assembly is disposed at the free end of the innermost cylinder of the telescopic cylinder, and is used to be connected to the down-the-hole hammer; when the drilling rig is drilling, the down-the-hole hammer is continuously lowered, and the telescopic cylinder is driven by the down-the-hole hammer to extend downward; when the drilling rig finishes drilling, the down-the-hole hammer is lifted up, and the telescopic cylinder is retracted accordingly.

[0007] Optionally, the number of the cylinders is greater than 2.

[0008] Optionally, the cross-section of the cylinder is circular.

[0009] Optionally, the inner diameter of the telescopic cylinder is larger than the drill rod, and the outer diameter is smaller than the down-the-hole hammer.

[0010] Optionally, a circle of limiting steps is provided inside one end of the multiple layers of nested cylinders, and a protrusion matched with the limiting steps is provided outside the other end, which is used to limit the adjacent cylinders and ensure the telescopic continuity of the telescopic cylinder.

[0011] Optionally, the first connecting assembly includes: a connecting plate, a plurality of rib plates and a connecting piece; the connecting plate is installed on the free end face of the outermost cylinder of the telescopic cylinder, the connecting piece is hollow and connected to the connecting plate through the rib plate; the connecting piece is provided with a plurality of pin shaft holes for connecting with the rotating part of the drilling rig power head.

[0012] Optionally, the second connecting assembly includes: an internally hollow buffer sleeve and a second connecting member; one end of the buffer sleeve is movably connected to the free end of the innermost cylinder of the telescopic cylinder, and the other end is fixedly connected to the down-the-hole hammer through the second connecting member.

[0013] Optionally, the cross-section of the second connecting member is L-shaped.

[0014] Optionally, the drill rod used in conjunction with the positive circulation slag removal auxiliary device is a long drill rod or a telescopic drill rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a positive circulation deslagging auxiliary device for a large-diameter down-the-hole hammer. A telescopic cylinder is arranged on the outside of a drill rod, and a first connecting assembly and a second connecting assembly are arranged at the upper and lower ends of the telescopic cylinder for respectively connecting a drilling rig power head and a down-the-hole hammer. When drilling, a small annular space gap is formed between the telescopic cylinder and the hole wall, which provides favorable conditions for positive circulation deslagging. At the same time, the use of a large-diameter drill rod can be avoided, the weight of the drill rod can be reduced, and the processing cost is lower.

[0016] The present invention provides a positive circulation slag discharge auxiliary device for a large-diameter down-the-hole hammer. The device is separated from an internal drill rod and is separately fixed to a drilling rig power head and a down-the-hole hammer. Therefore, the device is applicable to rotary drilling rigs and various power head drilling rigs, and can be used in conjunction with various drill rods with an inner diameter smaller than the inner diameter thereof. Compared with conventional large-diameter drill rods connected in sections, the device has stronger versatility and a wider range of applications.

[0017] The present invention provides a positive circulation slag removal auxiliary device for a large-diameter down-the-hole hammer. Compared with a conventional segmented large-diameter drill rod, when achieving the same drilling depth, the device is lighter in weight and can reduce the number of times the drill rod is replaced. Even within a certain drilling depth range, continuous drilling can be achieved without replacing the drill rod in combination with a longer drill rod or a telescopic drill rod. The conventional segmented large-diameter drill rod consists of a core rod and a barrel, which are welded by a rib plate and are heavier in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a schematic structural diagram of a positive circulation slag removal auxiliary device for a large diameter down-the-hole hammer in one embodiment of the present invention; Figure 2 The figure shows a schematic diagram of the structure of the second connecting assembly of the auxiliary device in one embodiment of the present invention; Figure 3 The figure shows a schematic diagram of the structure of the first connecting component of the auxiliary device in one embodiment of the present invention; Figure 4 The figure shows a cross-sectional schematic diagram of a down-the-hole hammer when an auxiliary device is used in one embodiment of the present invention; Figure 5 The figure shows a cross-sectional schematic diagram of a down-the-hole hammer when no auxiliary device is used in one embodiment of the present invention; In the figure: 1-large diameter down-the-hole hammer slag removal auxiliary device; 2-drill rod; 3-first connecting assembly; 4-first section of the cylinder; 5-second section of the cylinder; 6-third section of the cylinder; 7-second connecting assembly; 8-down-the-hole hammer; 9-annular gap (after using this device); 10-air supply channel; 11-hole wall; 12-annular gap (without using this device); 31-rib plate; 32-pin shaft hole; 33-connecting plate; 34-connecting piece one; 71-connecting piece two; 72-bolt; 73-limiting step; 74-protrusion; 75-buffer sleeve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0021] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. Example

[0022] The embodiment of the present invention introduces a positive circulation slag removal auxiliary device 1 for a large diameter down-the-hole hammer, such as Figure 1-4 As shown, it includes: a telescopic cylinder, a first connecting component 3 and a second connecting component 4; the telescopic cylinder includes multiple layers of cylinders nested in each other, and the adjacent cylinders are telescopic; the cylinder is hollow inside and penetrates from top to bottom, and can penetrate the drill rod 2 that drives the down-the-hole hammer 8; the first connecting component 3 is placed at the free end of the outermost cylinder of the telescopic cylinder, and is used to connect with the drilling rig power head; the second connecting component 5 is placed at the free end of the innermost cylinder of the telescopic cylinder, and is used to connect with the down-the-hole hammer 8; when the drilling rig is drilling, the down-the-hole hammer 8 is continuously lowered, and the telescopic cylinder is driven by the down-the-hole hammer 8 to extend downward; when the drilling rig power head drives the down-the-hole hammer 8 to rotate, the device 1, the drilling rig power head and the down-the-hole hammer 8 rotate synchronously; when the drilling rig is finished drilling, the down-the-hole hammer 8 is lifted up, and the telescopic cylinder is retracted accordingly.

[0023] The multiple layers of nested cylinders can be relatively telescopic with extremely small gaps. During the construction process, the device 1 is used to always maintain a continuous air return channel with a small annular gap between the down-the-hole hammer 8 and the drilling rig power head, thereby ensuring the slag removal effect.

[0024] The present invention provides a positive circulation deslagging auxiliary device for a large-diameter down-the-hole hammer, comprising a telescopic cylinder arranged on the outside of a drill rod 2, and a first connecting component 3 and a second connecting component 7 connecting the upper and lower ends of the telescopic cylinder, wherein the first connecting component 3 and the second connecting component 7 are respectively used to connect a drilling rig power head (not shown in the figure) and a down-the-hole hammer 8. When drilling, a small annular space gap 9 is formed between the telescopic cylinder and the hole wall 11, which provides favorable conditions for positive circulation deslagging, and can also avoid the use of a large-diameter drill rod, reduce the weight of the drill rod, and reduce the processing cost.

[0025] Specifically, the telescopic cylinder is formed by multiple layers of cylinders nested with each other. The inside of the multiple layers of cylinders is hollow and connected from top to bottom. The outer diameter is smaller than the drilling diameter of the down-the-hole hammer 8, and the inner diameter is larger than the outer diameter of the drill rod 2, so that it does not interfere with the drill rod 2 driving the down-the-hole hammer 8. In this embodiment, the telescopic cylinder is composed of three layers of cylinders, such as Figure 1 As shown, it includes a first section cylinder 4, a second section cylinder 5 and a third section cylinder 6; the free end surface of the first section cylinder 4 is connected to the first connecting component 3 for connecting to the drilling rig power head; the free end surface of the third section cylinder 6 is connected to the second connecting component 7 for connecting to the down-the-hole hammer 8; the diameter of the second section cylinder 5 is smaller than the diameter of the first section cylinder 4 and larger than the diameter of the third section cylinder 6, and adjacent cylinders can move up and down relative to each other.

[0026] In this embodiment, a circle of limiting steps 73 is provided inside one end of the multi-layer nested cylinders, and a protrusion 74 matching the limiting steps 73 is provided outside the other end, which is used to limit the adjacent cylinders to ensure the telescopic continuity of the telescopic cylinder. Specifically, limiting steps 73 are provided on the inner circles of one end (the end away from the down-the-hole hammer 8) of the first section cylinder 4, the second section cylinder 5 and the third section cylinder 6; at the same time, protrusions 74 are provided on the outer circles of the other ends (the end close to the down-the-hole hammer 8) of the first section cylinder 4, the second section cylinder 5 and the third section cylinder 6; each limiting step 73 is matched with the protrusion 74 at the corresponding position; the setting of the limiting steps 73 effectively reduces the gap between adjacent cylinders, and can also limit the axial movement distance between different cylinders to prevent separation or falling off.

[0027] Specifically, the outer diameter of the cylinder plus the protrusion 74 should be smaller than the inner diameter of the previous cylinder section (outer cylinder), and the inner diameter of the cylinder plus the limiting step 73 should be larger than the outer diameter of the next cylinder section (inner cylinder), so that adjacent cylinders can slide up and down and limit, ensuring the telescopic continuity of the telescopic cylinder.

[0028] Specifically in this embodiment, the thickness of the cylinder is 3 mm. Since the cylinder itself does not bear force, the thickness is minimized to reduce the weight and cost of the device while achieving the function of reducing the annular space gap. The cross-section of the cylinder is preferably designed to be circular, but it can also be other polygonal structures.

[0029] In this embodiment, if Figure 1-Figure 3 As shown, the first connection assembly 3 includes: a connection plate 33, a rib plate 31 and a connection piece 34; the connection plate 33 is installed on the free end face of the outermost cylinder (i.e., the first cylinder section 4) of the telescopic cylinder, and the connection piece 34 is hollow and connected to the connection plate 33 through the rib plate 31; the connection piece 34 is provided with a plurality of pin holes 32 for connecting with the rotary component of the drilling rig power head. Specifically, in order to increase the reliability of the first connection assembly 3, the rib plate 31 and the connection plate 33 and the connection piece 34 are welded, and the number of rib plates 31 can be determined according to actual needs. In this embodiment, the number of rib plates 31 is eight, thereby improving the connection strength between the parts, making the connection of the first connection assembly 3 more firm and durable. Specifically, the number of pin holes 32 is 4.

[0030] In this embodiment, if Figure 1-Figure 3 As shown, the second connection assembly 7 includes: a buffer sleeve 75 with a hollow interior and a second connection member 71; one end of the buffer sleeve 75 is movably connected to the free end of the innermost cylinder (i.e., the third cylinder 6) of the telescopic cylinder, and the other end is fixedly connected to the down-the-hole hammer 8 through the second connection member 71. Specifically, since the down-the-hole hammer 8 needs to continuously impact downward and rotate circumferentially during operation, the buffer sleeve 75 is arranged between the down-the-hole hammer 8 and the third cylinder 6, and the second connection member 71 connects the buffer sleeve 75 to the down-the-hole hammer 8 through a bolt 72; the cross section of the second connection member 71 is L-shaped.

[0031] Specifically, the connection method between the buffer sleeve 75 and the telescopic cylinder is the same as that between adjacent cylinders in the telescopic cylinder. The buffer sleeve 75 is movably connected to the free end of the innermost cylinder (i.e., the third cylinder 6) of the telescopic cylinder through the cooperation between the limiting step 73 and the protrusion 74. Figure 4 As shown, a protrusion 74 is provided on the outer ring of one end of the buffer sleeve 75 away from the down-the-hole hammer 8, which cooperates with a limiting step 73 provided at the free end of the third section cylinder 6 to achieve a buffering effect.

[0032] In this embodiment, the drill rod 2 used in conjunction with the positive circulation slag removal auxiliary device 1 is a long drill rod or a telescopic drill rod. The lower end of the drill rod 2 is connected to the down-the-hole hammer 8. The drill rod 2 or a separate air pipe is responsible for conveying high-pressure air for the down-the-hole hammer 8 to work. There is no need to supply air through the telescopic cylinder of the device 1, so there is no need to consider the sealing between the cylinders, reducing the difficulty of using the telescopic cylinder. A lifter and a bracket are placed on the upper end of the drill rod 2 and connected to the drilling mast of the rotary drilling rig; the down-the-hole hammer 8 is driven by the long drill rod or the telescopic drill rod. The auxiliary slag removal device 1 does not bear additional tension and torque, and the structural strength requirement is relatively small, so the thickness of the single-layer cylinder can be reduced as much as possible to reduce the weight. Example

[0033] The embodiment of the present invention introduces a large-diameter down-the-hole hammer positive circulation slag removal auxiliary device 1, comprising: a telescopic cylinder, a first connecting assembly 3 and a second connecting assembly 4; the diameter of the down-the-hole hammer 8 is larger than the maximum outer diameter of the telescopic cylinder (the outer diameter of the first section of the cylinder 4), so that when the drill rod 2 lifts or lowers the down-the-hole hammer 8, the telescopic cylinder can move with the down-the-hole hammer 8 without being restricted by the borehole diameter. When the down-the-hole hammer 8 drills downward, the telescopic cylinder is synchronously extended downward under the drive of gravity and the down-the-hole hammer 8; when the main machine lifts the down-the-hole hammer 8 upward, the down-the-hole hammer 8 lifts the telescopic cylinder to retract.

[0034] like Figure 4 As shown, when the large-diameter down-the-hole hammer positive circulation slag removal auxiliary device 1 is used for slag removal, the air compressor sends high-flow rate compressed air through the air inlet channel 10 inside the drill pipe 2 to the down-the-hole hammer 8 to provide impact kinetic energy. The down-the-hole hammer 8 breaks the rock into debris, and the upward return air volume drives the rock debris upward from the annular space 9 between the down-the-hole hammer 8 and the hole wall 11 and between the telescopic cylinder and the hole wall 11, and finally reaches the hole mouth and is blown out.

[0035] like Figure 5 As shown, the large-diameter down-the-hole hammer positive circulation deslagging auxiliary device 1 is not used, and only ordinary small-diameter drill pipes are used for deslagging. The air compressor sends high-flow compressed air through the air inlet channel 10 inside the small-diameter drill pipe to the down-the-hole hammer 8 to provide impact kinetic energy. The down-the-hole hammer 8 breaks the rock into debris, and the upward return air volume drives the rock debris upward from the annular gap 12 between the down-the-hole hammer 8 and the hole wall 11 and between the small-diameter drill pipe and the hole wall 11, and finally reaches the hole mouth and is blown out. Since the annular gap 9 is much smaller than the annular gap 12, the improved device can improve the deslagging efficiency under the same upward return air volume, avoid rock debris from accumulating at the bottom of the hole, and cause the hammer head of the down-the-hole hammer 8 to repeatedly impact it, affecting work efficiency. On the premise of meeting the deslagging effect, the upward return air volume can also be reduced, thereby reducing the energy consumption of the air compressor.

[0036] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A positive circulation slag removal auxiliary device for a large diameter down-the-hole hammer, characterized in that: include: A telescopic cylinder, a first connecting component and a second connecting component; the telescopic cylinder includes multiple layers of cylinders nested in each other, and adjacent cylinders are telescopic; the cylinder is hollow inside and penetrates from top to bottom, and can pass through the drill rod that drives the down-the-hole hammer; the first connecting component is placed at the free end of the outermost cylinder of the telescopic cylinder, and is used to connect to the drilling rig power head; the second connecting component is placed at the free end of the innermost cylinder of the telescopic cylinder, and is used to connect to the down-the-hole hammer; when the drilling rig is drilling, the down-the-hole hammer is continuously lowered, and the telescopic cylinder is driven by the down-the-hole hammer to extend downward; when the drilling rig finishes drilling, the down-the-hole hammer is lifted up, and the telescopic cylinder is retracted accordingly.

2. The large-diameter down-the-hole hammer positive circulation slag removal auxiliary device according to claim 1 is characterized in that: The number of the cylinders is greater than 2.

3. The large-diameter down-the-hole hammer positive circulation slag removal auxiliary device according to claim 2 is characterized in that: The cross section of the cylinder is circular.

4. The large-diameter down-the-hole hammer positive circulation slag removal auxiliary device according to claim 3 is characterized in that: The inner diameter of the telescopic cylinder is larger than the drill rod, and the outer diameter is smaller than the down-the-hole hammer.

5. The positive circulation slag removal auxiliary device for a large diameter down-the-hole hammer according to claim 4 is characterized in that: A circle of limiting steps is provided inside one end of the multi-layer nested cylinders, and a protrusion matched with the limiting steps is provided outside the other end, which is used to limit the positions between adjacent cylinders and ensure the telescopic continuity of the telescopic cylinders.

6. The positive circulation slag removal auxiliary device for a large diameter down-the-hole hammer according to claim 1 is characterized in that: The first connecting component includes: a connecting plate, a plurality of rib plates and a connecting piece 1; the connecting plate is installed on the free end face of the outermost cylinder of the telescopic cylinder, the connecting piece 1 is hollow and connected to the connecting plate through the rib plate; the connecting piece 1 is provided with a plurality of pin shaft holes for connecting with the rotating part of the drilling rig power head.

7. The large-diameter down-the-hole hammer positive circulation slag removal auxiliary device according to claim 1 is characterized in that: The second connecting assembly includes: a buffer sleeve with a hollow interior and a second connecting member; one end of the buffer sleeve is movably connected to the free end of the innermost cylinder of the telescopic cylinder, and the other end is fixedly connected to the down-the-hole hammer through the second connecting member.

8. The large-diameter down-the-hole hammer positive circulation slag removal auxiliary device according to claim 7 is characterized in that: The cross section of the second connecting member is L-shaped.

9. The positive circulation slag removal auxiliary device for a large diameter down-the-hole hammer according to claim 1 is characterized in that: The drill rod used in conjunction with the positive circulation slag removal auxiliary device is a long drill rod or a telescopic drill rod.

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