CN213775230U - Low wind pressure down-the-hole hammer - Google Patents

Abstract

The utility model discloses a low wind pressure down-the-hole impacter, which comprises an outer sleeve, wherein a first joint fixedly connected with the upper end of the outer sleeve, an air inlet non-return reversing mechanism hermetically connected with the first joint, a cylinder matched and installed with the inner wall of the outer sleeve, a second joint fixedly connected with the lower end of the outer sleeve and a drill bit arranged in the second joint and slidably connected with the second joint are sequentially arranged in the outer sleeve from top to bottom; the upper end of the cylinder is matched with an air inlet non-return reversing mechanism and forms a stroke air chamber, the lower end of the cylinder is matched with a guide sleeve and forms a return air chamber, and an air passage for conveying air to the return air chamber is formed between the cylinder and the outer sleeve; the air inlet non-return reversing mechanism comprises a valve seat, a spring seat, a plug body, a sealant and a first spring, and the spring seat is used for replacing a traditional guide pipe and a valve cover, so that the structure is simple, and the cost is saved.

Description

Low wind pressure down-the-hole hammer

Technical Field

The utility model relates to a mine, tunnel engineering machinery technical field especially relate to a low wind pressure down-the-hole impacter.

Background

In recent years, with the increasing investment on infrastructure and various mines in China, the pneumatic down-the-hole hammer is greatly valued in the technical field of rock crushing machinery by virtue of the advantages of simple structure, convenience in operation and maintenance, capability of effectively removing rock debris at the bottom of a well, no limitation of drilling depth, capability of reducing abrasion of a drilling tool and the like. With the rapid development of the drilling technology of the pneumatic down-the-hole hammer, the application field of the pneumatic down-the-hole hammer is continuously widened, and the pneumatic down-the-hole hammer is gradually developed from initial blast hole construction to almost all drilling construction fields of hydrographic well drilling, geological core exploration, reservoir dam foundation curtain grouting, engineering geological exploration, trenchless pipeline laying, building foundation, geotechnical engineering and the like.

The pneumatic down-the-hole hammer uses high-pressure air as a power source to drive a piston in the hammer to reciprocate at high speed and high frequency, so that the piston obtains enough energy to impact a drill bit to drill. The impact force acts on the drill bit in the form of stress waves, huge impact energy is generated within a very short time, rocks can be effectively crushed, holes can be formed quickly, and the purpose of drilling the rocks and the holes is achieved.

The existing low wind pressure down-the-hole impacter structure realizes that compressed air alternately enters a front air chamber and a rear air chamber of the impacter to complete air distribution action by reversing a valve plate, and finally a piston forms reciprocating motion; the hydraulic drill bit consists of 18 parts, namely a rear joint, a check valve, a spring, a rubber ring, a valve cover, a valve plate, a guide pipe, a gas distribution rod, an inner cylinder, a piston, an outer sleeve, a guide sleeve, a plug, a spring, a rubber rod, a transverse pin, a front joint and a drill bit, wherein the rear joint with rectangular threads is a machine part for connecting an impactor and a drill rod. The check valve is a check valve for preventing the rock slurry water from flowing into the impacter and the drill rod, and the spring is arranged in the cover of the air inlet check reversing mechanism. A damping rubber ring is arranged between the valve cover and the rear joint, and the outer sleeve, the inner cylinder, the gas distribution rod, the guide sleeve and the piston realize the gas distribution action of the piston motion together. The piston is a key element because it is an elongated piston with a central bore which directly converts the energy of the compressed air into kinetic energy of mechanical movement and transmits this kinetic energy to the drill bit by means of collisions. The transverse pin is used for preventing the drill bit from falling off. The plug, the spring, the rubber rod and the transverse pin form a transverse pin stop device, the front connector drives the drill bit to rotate and slide upwards, and the guide sleeve is used for matching with the piston to distribute gas.

However, those skilled in the art will find that the installation structure of the air inlet check structure and the reversing structure of the impactor can be further simplified.

Disclosure of Invention

In order to solve the technical problem, the utility model aims to overcome the not enough of prior art, provide a down-the-hole impacter, adopt neotype contrary switching-over structure that ends that admits air among this down-the-hole impacter, simple structure practices thrift the cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a low wind pressure down-the-hole impactor comprises an outer sleeve, wherein a first joint fixedly connected with the upper end of the outer sleeve, an air inlet non-return reversing mechanism hermetically connected with the first joint, an air cylinder matched and installed with the inner wall of the outer sleeve, a second joint fixedly connected with the lower end of the outer sleeve and a drill bit arranged in the second joint and in sliding connection with the second joint are sequentially arranged in the outer sleeve from top to bottom, and a piston in sliding connection with the air cylinder is arranged in the air cylinder; the upper end of the cylinder is matched with an air inlet non-return reversing mechanism and forms a stroke air chamber, the lower end of the cylinder is matched with a guide sleeve and forms a return air chamber, and an air passage for conveying air to the return air chamber is formed between the cylinder and the outer sleeve; it is characterized in that the preparation method is characterized in that,

the air inlet non-return reversing mechanism comprises a valve seat, a spring seat, a plug body, a sealant and a first spring, wherein a second central hole is formed in the upper end face of the valve seat, the spring seat is inserted and fixed in the second central hole, the sealant is fixedly arranged on the upper portion of the first plug body, the first spring is located between the spring seat and the plug body, and the plug body moves up and down in the outer sleeve;

the upper end face of the valve seat is provided with a stroke air inlet communicated with the stroke air chamber and a return air inlet communicated with the return air chamber, the end face of the top of the valve seat covers a valve plate for controlling the on-off of the stroke air inlet and the return air inlet, and the valve plate is sleeved on the spring seat.

Preferably, the upper end face of the valve seat is symmetrically provided with a first inclined face and a second inclined face, the stroke air inlet is located on the first inclined face, the return air inlet is located on the second inclined face, and the lower end face of the valve plate is a flat face.

More preferably, the first inclined surface and the second inclined surface are smoothly transited. So set up, can ensure the switching that the valve block can be steady, and then the working life of extension valve block.

Preferably, the lower end face of the valve plate is symmetrically provided with a third inclined face and a fourth inclined face, and the upper end face of the valve seat is a plane.

Preferably, the second central hole is a through hole;

or the second central hole is a blind hole, and a first radial hole communicated with the second central hole is formed in the valve seat.

Preferably, the spring holder is a stepped shaft and sequentially comprises a first shaft body and a second shaft body from bottom to top, the diameter of the second shaft body is larger than that of the first shaft body, the first shaft body is inserted and fixed in the second central hole, the valve plate is sleeved on the first shaft body, and the diameter of the second shaft body is smaller than that of the valve plate.

Preferably, a plurality of positioning blocks are uniformly distributed on the side wall of the plug body in a circumferential manner, the positioning blocks and the plug body are integrally formed, and the positioning blocks are in clearance fit with the inner side wall of the outer sleeve or the first connector.

Preferably, the lower end face of the plug body is provided with a blind hole for accommodating part of the first spring, a plurality of second radial holes are uniformly distributed on the side wall of the blind hole in the circumferential direction, and each second radial hole is distributed between two adjacent positioning blocks.

Preferably, the sealant is conical or hemispherical.

Preferably, the spring seat is further provided with a plug, a third central through hole is formed in the spring seat and is a stepped hole, the third central through hole comprises a first hole and a second hole from top to bottom, the first hole is used for accommodating a part of the first spring, and the plug is located in the second hole.

Preferably, the valve seat is in interference fit with the inner side wall of the outer sleeve and the inner side wall of the cylinder, the lower end face of the first joint abuts against the valve seat, and the upper end face of the cylinder abuts against the valve seat.

The utility model has the advantages that: traditional valve gap is through accomplishing the assembly with outer tube inside wall interference fit and sealing washer to still need to be provided with the air vent on the valve gap and guarantee high-pressure gas's circulation, the stand pipe is the installation that is used for valve block and valve gap, and through setting up simple structure's spring holder alright replace valve gap and the stand pipe in the traditional down-the-hole impacter completely, reduced the inside spare part quantity of impacter promptly, and reduced the length of impacter, practiced thrift the cost.

Drawings

Fig. 1 is a first cross-sectional view of a low and medium wind pressure down-the-hole impactor in accordance with an embodiment of the present invention;

FIG. 2 is a second cross-sectional view of a low and medium wind pressure down-the-hole impactor in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a plug body and a sealant according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a valve seat according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a spring seat according to a first embodiment of the present invention.

Description of reference numerals: 1. an outer sleeve; 2. a first joint; 3. a cylinder; 4. a second joint; 5. a piston; 6. a valve seat; 7. a spring seat; 8. a plug body; 9. sealing glue; 10. a first spring; 61. a second central aperture; 62. a stroke intake port; 63. a return air inlet; 11. a valve plate; 64. a first inclined surface; 65. a second inclined surface; 71. a first shaft body; 72. a second shaft body; 81. positioning blocks; 82. a second radial bore; 12. a plug; 73. a third central through hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

as shown in fig. 1 and 2, a low wind pressure down-the-hole impactor comprises an outer sleeve 1, wherein a first joint 2 fixedly connected with the upper end of the outer sleeve 1, an air inlet non-return reversing mechanism hermetically connected with the first joint 2, an air cylinder 3 installed in cooperation with the inner wall of the outer sleeve 1, a second joint 4 fixedly connected with the lower end of the outer sleeve 1, and a drill bit arranged in the second joint 4 and slidably connected with the second joint 4 are sequentially arranged in the outer sleeve 1 from top to bottom, and a piston 5 slidably connected with the air cylinder 3 is arranged in the air cylinder 3; the upper end of the cylinder 3 is matched with an air inlet non-return reversing mechanism and forms a stroke air chamber, the lower end of the cylinder 3 is matched with a guide sleeve and forms a return air chamber, and an air passage for conveying air to the return air chamber is formed between the cylinder 3 and the outer sleeve 1;

in this embodiment, the air intake reverse stopping and reversing mechanism includes a valve seat 6, a spring seat 7, a plug body 8, a sealant 9 and a first spring 10, the upper end surface of the valve seat 6 is provided with a second central hole 61, the spring seat 7 is inserted and fixed in the second central hole 61, the sealant 9 is fixedly installed on the upper portion of the first plug body 8, the first spring 10 is located between the spring seat 7 and the plug body 8, and the plug body 8 moves up and down in the outer sleeve 1;

the upper end surface of the valve seat 6 is provided with a stroke air inlet 62 communicated with the stroke air chamber and a return air inlet 63 communicated with the return air chamber, the end surface of the top of the valve seat 6 is covered with a valve plate 11 for controlling the on-off of the stroke air inlet 62 and the return air inlet 63, and the valve plate 11 is sleeved on the spring seat 7.

Traditional valve gap is through accomplishing the assembly with outer tube 1 inside wall interference fit and sealing washer to still need to be provided with the air vent on the valve gap and guarantee high-pressure gas's circulation, the stand pipe is the installation that is used for valve block 11 and valve gap, and through setting up simple structure's spring holder 7 alright replace valve gap and the stand pipe in the traditional down-the-hole impacter completely, reduced the inside spare part quantity of impacter promptly, and reduced the length of impacter, practiced thrift the cost.

In this embodiment, as shown in fig. 4, a first inclined surface 64 and a second inclined surface 65 are symmetrically arranged on the upper end surface of the valve seat 6, the stroke air inlet hole 62 is located on the first inclined surface 64, the return air inlet hole 63 is located on the second inclined surface 65, and the lower end surface of the valve plate 11 is a flat surface. So set up, set up the inclined plane structure on disk seat 6, adopt flat valve block 11 to shift, saved the locating pin structure, and even the valve block 11 is rotatory, the contact surface of valve block 11 and disk seat 6 is effective all the time.

Further preferably, the first inclined surface 64 and the second inclined surface 65 are smoothly transitioned. So set up, can ensure the switching that valve block 11 can be steady, and then extension valve block 11's working life.

In other embodiments, a third inclined surface and a fourth inclined surface are symmetrically arranged on the lower end surface of the valve plate 11, and the upper end surface of the valve seat 6 is a plane; further preferably, the valve plate is further provided with a positioning pin, and the positioning pin is used for limiting circumferential rotation of the valve plate 11.

In the present embodiment, the second center hole 61 is a through hole;

or, the second central hole 61 is a blind hole, and the valve seat 6 is provided with a first radial hole communicated with the second central hole 61.

In this embodiment, as shown in fig. 5, the spring seat 7 is a stepped shaft, and sequentially includes a first shaft body 71 and a second shaft body 72 from bottom to top, a diameter of the second shaft body 72 is greater than a diameter of the first shaft body 71, the first shaft body 71 is inserted and fixed in the second center hole 61, the valve plate 11 is sleeved on the first shaft body 71, and a diameter of the second shaft body 72 is smaller than a diameter of the valve plate 11; so configured, spring seat 7 does not substantially obstruct the flow of high pressure gas.

In this embodiment, as shown in fig. 3, a plurality of positioning blocks 81 are uniformly distributed on the sidewall of the plug body 8 in a circumferential manner, the positioning blocks 81 and the plug body 8 are integrally formed, and the positioning blocks 81 are in clearance fit with the inner sidewall of the outer sleeve 1 or the first connector 2; the arrangement is to prevent the plug body 8 from shaking left and right in the up-and-down moving process, so that the sealing is not in place and the fluidity of high-pressure gas is influenced; in addition, the two adjacent positioning blocks 81 are used for the circulation of high-pressure gas.

In this embodiment, a blind hole for accommodating a part of the first spring 10 is disposed on the lower end surface of the plug body 8, a plurality of second radial holes 82 are uniformly distributed on the sidewall of the blind hole in a circumferential manner, each second radial hole 82 is uniformly distributed between two adjacent positioning blocks 81, the arrangement is such that the high-pressure gas circulation is enhanced, and in addition, the blind hole is also used for mounting the first spring 10.

In this embodiment, the sealant 9 is conical or hemispherical.

In this embodiment, a plug 12 is further provided, a third central through hole 73 is provided on the spring seat 7, the third central through hole 73 is a stepped hole and includes a first hole and a second hole from top to bottom, the first hole is used for accommodating a part of the first spring 10, and the plug 12 is located in the second hole; with the arrangement, when the down-the-hole hammer works normally, the plug 12 is positioned in the second hole to prevent high-pressure gas from flowing in the spring seat 7 and the central hole in the valve seat 6, and when the down-the-hole hammer needs to strengthen slag discharge, the plug 12 can be taken out.

In this embodiment, the valve seat 6 is in interference fit with the inner side wall of the outer sleeve 1 and the inner side wall of the cylinder 3, the lower end surface of the first joint 2 abuts against the valve seat 6, and the upper end surface of the cylinder 3 abuts against the valve seat 6.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A low wind pressure down-the-hole impacter comprises an outer sleeve (1), wherein a first joint (2) fixedly connected with the upper end of the outer sleeve (1), an air inlet check reversing mechanism hermetically connected with the first joint (2), an air cylinder (3) installed in cooperation with the inner wall of the outer sleeve (1), a second joint (4) fixedly connected with the lower end of the outer sleeve (1) and a drill bit arranged in the second joint and in sliding connection with the second joint are sequentially arranged in the outer sleeve (1) from top to bottom, and a piston (5) in sliding connection with the air cylinder (3) is arranged in the air cylinder (3); a piston which is connected with the cylinder (3) in a sliding way is arranged in the cylinder (3); the upper end of the cylinder (3) is matched with an air inlet non-return reversing mechanism to form a stroke air chamber, the lower end of the cylinder (3) is matched with a guide sleeve to form a return air chamber, and an air passage for conveying air to the return air chamber is formed between the cylinder (3) and the outer sleeve (1); it is characterized in that the preparation method is characterized in that,

the air inlet non-return reversing mechanism comprises a valve seat (6), a spring seat (7), a plug body (8), a sealant (9) and a first spring (10), wherein a second central hole (61) is formed in the upper end face of the valve seat (6), the spring seat (7) is inserted and fixed in the second central hole (61), the sealant (9) is fixedly installed on the upper portion of the first plug body (8), the first spring (10) is located between the spring seat (7) and the plug body (8), and the plug body (8) moves up and down in the outer sleeve (1);

the upper end face of the valve seat (6) is provided with a stroke air inlet hole (62) communicated with the stroke air chamber and a return air inlet hole (63) communicated with the return air chamber, the top end face of the valve seat (6) is covered with a valve plate (11) for controlling the stroke air inlet hole (62) and the return air inlet hole (63) to be opened and closed, and the valve plate (11) is sleeved on the spring seat (7).

2. The low wind pressure down-the-hole hammer of claim 1, characterized in that the upper end face of the valve seat (6) is symmetrically provided with a first inclined surface (64) and a second inclined surface (65), the stroke air inlet hole (62) is located on the first inclined surface (64), the return air inlet hole (63) is located on the second inclined surface (65), and the lower end face of the valve plate (11) is a flat surface.

3. A low wind pressure down-the-hole impactor according to claim 2, wherein the first inclined surface (64) and the second inclined surface (65) are rounded off.

4. The low wind pressure down-the-hole impactor as defined in claim 1, wherein the lower end surface of the valve plate (11) is symmetrically provided with a third inclined surface and a fourth inclined surface, and the upper end surface of the valve seat (6) is a plane.

5. A low wind pressure down-the-hole impactor according to claim 1, wherein said second central hole (61) is a through hole; or the second central hole (61) is a blind hole, and a first radial hole communicated with the second central hole (61) is formed in the valve seat (6).

6. The low wind pressure down-the-hole hammer of claim 1, wherein the spring seat (7) is a stepped shaft and comprises a first shaft body (71) and a second shaft body (72) from bottom to top, the diameter of the second shaft body (72) is larger than that of the first shaft body (71), the first shaft body (71) is inserted and fixed in the second center hole (61), the valve plate (11) is sleeved on the first shaft body (71), and the diameter of the second shaft body (72) is smaller than that of the valve plate (11).

7. The low wind pressure down-the-hole impactor as defined in claim 1, wherein a plurality of positioning blocks (81) are circumferentially and uniformly distributed on the sidewall of the plug body (8), the plurality of positioning blocks (81) are integrally formed with the plug body (8), and the plurality of positioning blocks (81) are in clearance fit with the inner sidewall of the outer sleeve (1) or the first joint (2).

8. A low wind pressure down-the-hole impactor as claimed in claim 7, characterised in that the lower end face of the plug body (8) is provided with a blind hole for accommodating part of the first spring (10), a plurality of second radial holes (82) are circumferentially and uniformly distributed on the side wall of the blind hole, and each second radial hole (82) is distributed between two adjacent positioning blocks (81).

9. A low wind pressure down-the-hole impactor according to claim 1, characterised in that said sealant (9) is conical or hemispherical.

10. A low wind pressure down-the-hole impactor according to claim 1, characterized in that a plug (12) is further provided, a third central through hole (73) is provided in the spring seat (7), the third central through hole (73) is a stepped hole and comprises a first hole and a second hole from top to bottom, the first hole is used for accommodating a part of the first spring (10), and the plug (12) is located in the second hole.

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