CN213775231U

CN213775231U - Cross joint and down-the-hole drilling device

Info

Publication number: CN213775231U
Application number: CN202022876801.8U
Authority: CN
Inventors: 殷国乐; 王艳丽; 王林清; 陈浩文; 冯起赠; 宋志彬
Original assignee: Institute of Exploration Technology Chinese Academy of Geological Sciences
Current assignee: Institute of Exploration Technology Chinese Academy of Geological Sciences
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-07-23
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a cross joint, wear-resisting subassembly cover is in the middle part of the connecting pipe, the connecting pipe both ends are used for communicating outside air inlet subassembly and positive circulation down-the-hole hammer respectively, the main shaft cover is in the core pipe periphery, form annular gap between the two, the annular gap both ends communicate outside air inlet subassembly and positive circulation down-the-hole hammer respectively, outside air inlet subassembly is used for sending into high-pressure air to annular gap and drive positive circulation down-the-hole hammer and bore and blow up the rock sediment, be equipped with the slag inlet that is located between wear-resisting subassembly and the positive circulation down-the-hole hammer on the connecting pipe, high-pressure gas blows in the core pipe and derives the well through the slag inlet with the rock sediment; the power head distributes a high-pressure gas distribution device between the inner pipe and the outer pipe and guides the high-pressure gas distribution device into the annular gap, one end of the outer pipe is in threaded connection with the main shaft, one end of the inner pipe extends into the core pipe, a sealing ring is arranged between the inner pipe and the core pipe, and the positive circulation down-the-hole hammer is connected with the main shaft. The cross joint and the down-the-hole drilling device can reduce production cost and improve drilling efficiency.

Description

Cross joint and down-the-hole drilling device

Technical Field

The utility model relates to a drilling tool technical field specifically relates to a cross connection and down-the-hole drilling device.

Background

In the drilling process of the large-caliber positive circulation down-the-hole hammer, as the diameter of a drill hole is large, the outer diameter of a drill tool is small, the annular gap between the drill tool and the hole wall is large, along with the increase of the depth of the drill hole, the traditional positive circulation down-the-hole hammer drilling process needs to blow out rock powder from the annular gap between a drill rod and the hole wall by air, the pressure and the air quantity of an air compressor are large, so that a plurality of air compressors are frequently used in parallel, a supercharger needs to be added, and the economic cost is high.

The reverse circulation down-the-hole hammer drilling process is characterized in that rock slag is discharged from a central channel of a drill rod, the slag discharging area is small, and the pressure and air quantity required by an air compressor are small, so that the reverse circulation down-the-hole hammer drilling process is more suitable for large-aperture down-the-hole hammer drilling from the aspect of economic cost, but at present, a reverse circulation down-the-hole hammer with a large aperture (450mm) or more in China has no mature product in the market, and the reverse circulation down-the-hole hammer drilling process is not applied to a large number of practical applications. And the common reverse circulation down-the-hole hammer needs to leave a certain space at the center for deslagging, and the structure is different from that of the positive circulation down-the-hole hammer, so that the required impact power is larger than that of the positive circulation down-the-hole hammer, and the drilling efficiency is lower than that of the positive circulation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cross joint and down-the-hole drilling device to solve the problem that above-mentioned prior art exists, reduction in production cost, and improve and creep into efficiency.

In order to achieve the above object, the utility model provides a following scheme:

the utility model provides a cross joint, including connecting pipe and wear-resisting subassembly, wear-resisting subassembly cover is located on the outer wall at connecting pipe middle part, the periphery of wear-resisting subassembly is used for contacting the wall of a well, the connecting pipe includes main shaft and core pipe, the main shaft can be in the wear-resisting subassembly internal rotation, the main shaft cover is located the core pipe periphery, just form annular gap between main shaft inner wall and the core pipe outer wall, the one end of annular gap is used for the air outlet of intercommunication outside air inlet subassembly, and outside air inlet subassembly is used for sending into high-pressure air in the annular gap, the other end of annular gap is used for communicating with positive circulation down-the-hole hammer, and high-pressure air in the annular gap is used for driving positive circulation down-the hammer to strike and creep into and blow up the rock sediment in the well, still be equipped with the sediment passageway on the connecting pipe, the sediment passageway is used for communicating with the core pipe inner chamber in the well, and the slag inlet channel is positioned between the wear-resistant component and the positive circulation down-the-hole hammer, and high-pressure gas can blow in rock slag in the well into the core tube through the slag inlet channel and guide the rock slag out of the well through the core tube.

Preferably, an outer slag inlet is formed in part of the side wall of the main shaft, and the outer slag inlet can be communicated with the inner cavity of the main shaft and the well; one end of the core pipe, which is close to the external air inlet assembly, is opened, one end of the core pipe, which is close to the positive circulation down-the-hole hammer, is closed, and an internal slag inlet is formed in the position, which corresponds to the external slag inlet, of the core pipe; a communicating pipe is arranged between the inner slag inlet and the outer slag inlet, one end of the communicating pipe is fixed on the side wall of the inner slag inlet, the other end of the communicating pipe is fixed on the side wall of the outer slag inlet, the inner slag inlet, the outer slag inlet and the communicating pipe form a slag inlet channel, and the slag inlet channel is not communicated with the annular gap.

Preferably, the core tube is a cylindrical tube.

Preferably, the upper end of main shaft is used for dismantling with outside air inlet subassembly and is connected, the lower extreme of main shaft is used for dismantling with positive circulation down-the-hole hammer and is connected.

Preferably, the wear-resistant assembly comprises a bearing set, a bearing frame, a seal set, two wear-resistant sleeves and two glands, the bearing set is sleeved on the periphery of the main shaft, the main shaft can rotate in the bearing set, the bearing set is installed on the bearing frame, the wear-resistant sleeves are sleeved on the periphery of the main shaft and are respectively located at two ends of the bearing set, the main shaft can drive the wear-resistant sleeves to rotate, rotary seals are arranged between the bearing frame and each wear-resistant sleeve, the inner walls of the rotary seals are in contact with the outer walls of the wear-resistant sleeves, the outer walls of the rotary seals are in contact with the inner walls of the bearing frame, one ends of the rotary seals, which are far away from the bearing set, are respectively flush with two ends of the bearing frame, each gland is detachably connected to two ends of the bearing frame respectively, and the two glands are sleeved on the periphery of the bearing frame, the sealing group is located two between the gland, just the sealing group cover is located the bearing frame periphery, the inner wall of sealing group with the bearing frame outer wall contact, the outer wall of sealing group stretches out the gland is used for contacting the wall of a well.

Preferably, the bearing assembly includes deep groove ball bearing and thrust bearing, the main shaft middle part is equipped with spacing step, deep groove ball bearing with thrust bearing is located respectively spacing step's both sides, just deep groove ball bearing cover is located one side that is close to outside air inlet subassembly on the main shaft, thrust bearing cover is located one side that is close to positive circulation down-the-hole hammer on the main shaft.

Preferably, the both sides of sealed group contact two respectively the gland, sealed group includes first closing plate, second closing plate and a plurality of spacing post, first closing plate is used for being close to outside air inlet subassembly setting, the second closing plate is used for being close to positive circulation down-the-hole hammer setting, just the hardness of second closing plate is greater than the hardness of first closing plate, spacing post passes in proper order first closing plate with the second closing plate, just the both ends of spacing post stretch out respectively first closing plate with the second closing plate, the gland is gone up to correspond the position of spacing post is equipped with the slot, the both ends of spacing post stretch into respectively in the slot, and be used for the restriction the rotation of sealed group.

Preferably, one side of the wear-resistant sleeve far away from the bearing group is provided with a first notch, a position on the side wall of the main shaft corresponding to the first notch is provided with a second notch, a flat key is embedded in the first notch and the second notch, and the flat key is fixedly connected to the main shaft through a bolt.

Preferably, the outer wall of each gland is provided with a plurality of grooves, the grooves penetrate through the glands in the thickness direction of the glands, the positions of the grooves on the two glands correspond to one another, and the grooves are used for penetrating through a small-caliber drilling tool.

The utility model also provides a down-the-hole drilling device, including air inlet subassembly, positive circulation down-the-hole hammer and any one of the above-mentioned technical scheme cross connection, the air inlet subassembly includes unit head, high-pressure distributing device and the double-walled drilling rod that connects gradually and communicate, the unit head is used for letting in high-pressure gas to the high-pressure distributing device, the double-walled drilling rod includes inner tube and the outer tube of coaxial setting, the outer tube cover is located in the inner tube periphery, just one end of outer tube stretches into in the main shaft, and with main shaft threaded connection, the one end that is close to the core pipe on the inner tube stretches into in the core pipe, high-pressure distributing device is used for leading-in high-pressure gas in the annular gap through the clearance between inner tube and the outer tube, just be equipped with the sealing washer between inner tube outer wall and the core pipe inner wall, the sealing washer is used for preventing high-pressure gas from getting into in the core pipe, the positive circulation down-the-hole hammer is arranged at one end, far away from the double-wall drill rod, of the main shaft and is in threaded connection with the inner wall of the main shaft.

The utility model discloses for prior art gain following technological effect:

the utility model provides a cross joint, wear-resisting subassembly cover is located on the outer wall at connecting pipe middle part, and the connecting pipe can rotate in wear-resisting subassembly, wear-resisting subassembly's periphery is used for contacting the wall of a well, seal between connecting pipe and the wall of a well through wear-resisting subassembly, prevent that the rock sediment from turning back out between the outer wall of connecting pipe and the wall of a well, outside air inlet subassembly is used for sending into high-pressure air to the annular gap, and high-pressure air is used for driving positive circulation down-the-hole hammer impact drilling and blow up the rock sediment in the well in the annular gap, still be equipped with into the sediment passageway on the connecting pipe, it is used for communicating with the inner chamber of the well and core pipe to advance the sediment passageway, and advance the sediment passageway and be located between wear-resisting subassembly and the positive circulation down-the-hole hammer, make high-pressure air blow up the rock sediment, be blockked by wear-resisting subassembly and the wall of a well, get into the core pipe through advancing the sediment passageway, and derive the rock sediment to the outside of the well, improve the rock sediment derivation efficiency, and then improve and creep into efficiency, and derive the rock sediment to the well outside through the core pipe, the area of slagging tap is little, and the pressure and the amount of wind that need are less to reduce cost.

The utility model provides a down-the-hole creeps into device, the one end of outer tube stretches into in the main shaft, and with main shaft threaded connection, with the stability of being connected, the one end that is close to the core pipe on the inner tube stretches into to the core intraductal, so that clearance between outer tube and the inner tube can communicate the annular gap, realize high-pressure gas's transport, and be equipped with the sealing washer between inner tube outer wall and the core intraductal wall, in order to guarantee that high-pressure gas all enters into the annular gap, prevent the reflection-out of influence rock sediment in the core pipe of high-pressure gas entering, improve the efficiency of creeping into, the down-the-hole hammer of positive circulation is installed in the main shaft the one end of keeping away from the double-walled drilling rod, and with main shaft inner wall threaded connection, with the stability of improving the connection, prevent the down-the-down-the-hole hammer of creeping into and drop, and then influence creeps into efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a cross-connect provided in accordance with one embodiment;

FIG. 2 is a schematic structural diagram of a main shaft in the cross joint provided in the first embodiment;

FIG. 3 is a schematic view of a core barrel in a cross-over joint according to an embodiment;

FIG. 4 is a cross-sectional view A-A of the crossover joint of FIG. 1;

FIG. 5 is a schematic structural diagram of a wear sleeve in a crossover joint provided in accordance with an embodiment;

FIG. 6 is a schematic view of a bearing bracket of a cross joint according to an embodiment;

FIG. 7 is a schematic view showing a structure of a gland in the cross joint according to the first embodiment;

FIG. 8 is a schematic view of the flat key structure of the cross-over joint according to one embodiment;

FIG. 9 is a schematic view of the down-the-hole drilling apparatus provided in the second embodiment;

in the figure: 1-connecting pipe, 11-main shaft, 111-outer slag inlet, 112-outer connecting shaft, 113-intermediate shaft, 114-inner connecting shaft, 115-limiting step, 116-first notch, 12-core pipe, 121-inner slag inlet, 13-annular gap, 2-wear-resistant component, 21-wear-resistant sleeve, 221-deep groove ball bearing, 222-thrust bearing, 23-rotary seal, 24-bearing bracket, 25-gland, 251-groove, 26-second sealing plate, 27-first sealing plate, 28-limiting column, 29-flat key, 3-double-wall drill rod, 31-outer pipe and 32-inner pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model aims at providing a cross joint and down-the-hole drilling device to the down-the-hole device is with high costs in solving current well, creeps into technical problem of inefficiency.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Example one

As shown in fig. 1-8, this embodiment provides a cross joint, which includes a connecting pipe 1 and a wear-resistant component 2, the wear-resistant component 2 is sleeved on an outer wall of a middle portion of the connecting pipe 1, an outer periphery of the wear-resistant component 2 is used for contacting a well wall, the connecting pipe 1 and the well wall are sealed by the wear-resistant component 2, rock slag is prevented from being reflected out between the outer wall of the connecting pipe 1 and the well wall, the connecting pipe 1 includes a main shaft 11 and a core pipe 12, and the main shaft 11 can rotate in the wear-resistant component 2 to ensure normal drilling, one end of the main shaft 11 is used for being connected and communicated with an external air intake component, high-pressure gas is introduced through the external air intake component and rock slag is reflected out, the other end of the main shaft 11 is used for being connected with a forward circulation down-the-hole hammer to drive the forward circulation down-the-hole hammer to drill, the main shaft 11 is sleeved on an outer periphery of the core pipe 12, an annular gap 13 is formed between an inner wall of the main shaft 11 and an outer wall of the core pipe 12, one end of the annular gap 13 is used for being communicated with an air outlet of the external air intake component, and the external air intake component is used for sending high-pressure air into the annular gap 13, the other end of the annular gap 13 is used for being communicated with the positive circulation down-the-hole hammer, so that part of gas in the annular gap 13 can enter the positive circulation down-the-hole hammer, and the high-pressure air in the annular gap 13 is used for driving the positive circulation down-the-hole hammer to impact, drill and blow up rock slag in the well, the connecting pipe 1 is also provided with a slag inlet channel which is used for communicating the inner cavity of the well with the inner cavity of the core pipe 12, and the slag inlet channel is positioned between the wear-resistant component 2 and the positive circulation down-the-hole hammer, so that after the rock slag is blown up by the high-pressure air, the rock slag is blocked by the wear-resistant component 2 and the well wall, enters the core pipe 12 through the slag inlet channel, and is led out of the well through the core pipe 12, the rock slag leading-out efficiency is improved, the rock slag discharging area is small, and the required pressure and air quantity are small, thereby reducing the cost.

Specifically, as shown in fig. 2, an outer slag inlet 111 is formed in a part of a side wall of the main shaft 11, the outer slag inlet 111 can communicate an inner cavity of the main shaft 11 with a well, preferably, the main shaft 11 includes an outer connecting shaft 112, an intermediate shaft 113 and an inner connecting shaft 114 which are coaxially arranged, the outer connecting shaft 112, the intermediate shaft 113 and the inner connecting shaft 114 are sequentially connected and communicated, the outer connecting shaft 112 is used for connecting an external air inlet assembly, and the inner connecting shaft 114 is used for connecting a positive circulation down-the-hole hammer, so that the integrity of the device is improved, the circulation of high-pressure gas is ensured, and rock slag is reversed out.

As shown in fig. 3-4, the core tube 12 is a cylindrical tube, and one end of the core tube 12 close to the external air intake assembly is opened, so that the core tube 12 is directly communicated with the slag suction port of the external air intake assembly, and the rock slag is prevented from entering the positive circulation down-the-hole hammer, and an inner slag inlet 121 is arranged on the core tube 12 corresponding to the outer slag inlet 111, and the inner slag inlet 121 can communicate the inner cavity of the core tube 12 with the outer slag inlet 111, so that the communication between the inner cavity of the well and the inner cavity of the core tube 12 is realized, and the rock slag is prevented from being discharged; a communicating pipe is arranged between the inner slag inlet 121 and the outer slag inlet 111, one end of the communicating pipe is fixed on the side wall of the inner slag inlet 121, the other end of the communicating pipe is fixed on the side wall of the outer slag inlet 111, and the inner slag inlet 121, the outer slag inlet 111 and the communicating pipe form a slag inlet channel, preferably, two ends of the communicating pipe are respectively welded and fixed with the edges of the outer slag inlet 111 and the inner slag inlet 121, and the inner slag inlet 121 and the outer slag inlet 111 are not communicated with the annular gap 13, more preferably, the communicating pipe is formed by a rib plate, so that the gas in the annular gap 13 can not enter the inner cavity of the core pipe 12 or the outside of the main shaft 11 through the outer slag inlet 111 and the inner slag inlet 121, can only enter the inner connecting shaft 114 by winding the outer slag inlet 111 and the inner slag inlet 121, and finally reaches the positive circulation down-hole hammer, one end of the annular gap 13 is communicated with the inner connecting shaft 112, and the other end is communicated with the connecting shaft 114, so as to realize the communication of high-pressure gas, and more preferably, the number of the outer slag inlets 111 and the number of the inner slag inlets 121 are two, and the two outer slag inlets 111 are symmetrically arranged along the central axis of the main shaft 11.

The end of the core tube 12 close to the external connecting shaft 112 extends into the external connecting shaft 112 and is located in the middle of the external connecting shaft 112, namely, the core tube 12 does not extend out of the external connecting shaft 112 and is not flush with the end of the external connecting shaft 112, the upper end of the main shaft (namely, the external connecting shaft 112) is used for being detachably connected with an external air inlet assembly, the end of the core tube 12 far away from the external connecting shaft 112 is located in the middle shaft 113 and is close to the internal connecting shaft 114 so as to guide high-pressure gas into the positive circulation down-the-hole hammer, the connection between the internal connecting shaft 114 and the positive circulation down-the-hole hammer is not affected, and the lower end of the main shaft (namely, the internal connecting shaft 114) is used for being detachably connected with the positive circulation down-the-hole hammer.

The wear-resistant assembly 2 comprises a bearing set, a bearing frame 24, a sealing set, two wear-resistant sleeves 21 and two pressing covers 25, the bearing set is sleeved on the periphery of the spindle 11, the spindle 11 can rotate in the bearing set, the bearing set is installed on the bearing frame 24 to ensure the rotating stability of the spindle 11, the wear-resistant sleeves 21 are sleeved on the periphery of the spindle 11 and are respectively positioned at two ends of the bearing set, the spindle 11 can drive the wear-resistant sleeves 21 to rotate, the outer wall of the spindle 11 is protected by the wear-resistant sleeves 21 to prevent the spindle 11 from being worn and influence the service life, when the wear-resistant sleeves 21 are worn after being used for a long time, only the wear-resistant sleeves 21 are worn, the wear-resistant sleeves 21 can be directly replaced, the cost is reduced, and the replacement is convenient, rotary seals 23 are arranged between the bearing frame 24 and the wear-resistant sleeves 21, the inner walls of the rotary seals 23 contact the outer walls of the wear-resistant sleeves 21, when the spindle 11 drives the wear-resistant sleeves 21 to rotate, the wear-resistant sleeves 21 to rub and relatively rotate, thereby avoiding the contact between the main shaft 11 and the rotary seal 23 and the abrasion of the main shaft 11, the outer wall of the rotary seal 23 contacts the inner wall of the bearing frame 24, thereby forming a closed space through the bearing frame 24, the two rotary seals 23, the main shaft 11 and the wear-resistant sleeve 21, the bearing group is positioned in the closed space, avoiding rock slag from entering the bearing group in the drilling process and influencing the service life of the bearing group, better, the conventional oil seal has lower pressure resistance and is not suitable for the working condition, the rotary seal 23 is designed to be silica gel seal and is compressed by steel plates, four groups of silica gel-steel plate combinations are arranged to form the rotary seal 23, each group of silica gel-steel plate consists of one silica gel and one steel plate, the sealing effect is improved, the service life of the bearing group is prolonged, the production cost is reduced, one end of each rotary seal 23 far away from the bearing group is respectively flush with the two ends of the bearing frame 24 so as to install the gland 25, each gland 25 is detachably connected with two ends of the bearing frame 24 respectively, and the two glands 25 are sleeved on the periphery of the bearing frame 24, the two glands 25 are symmetrically arranged, namely, each gland 25 comprises a connecting end surface and a connecting side wall, the connecting side wall is fixed around the circumference of the connecting end surface, one end of the connecting side wall is fixed with the outer edge of the connecting end surface, the other end of the connecting side wall extends towards one end far away from the connecting end surface, the connecting end surface is vertical to the central shaft of the main shaft 11, the connecting side wall is parallel to the central shaft of the main shaft 11, the connecting side wall sequentially penetrates through the connecting end surface and the bearing frame 24 through bolts to realize connection, the inner wall of the connecting side wall contacts with the outer wall of the bearing frame 24, the sealing group is positioned between the two glands 25, namely, the sealing group is sleeved on the periphery of the bearing frame 24, the inner wall of the sealing group contacts with the outer wall of the bearing frame 24, the outer wall of the sealing group extends out of the gland 25 and is used for contacting with the well wall of the well through the sealing group, avoid parts such as gland 25 and the wall of a well contact, both realized the fixed of parts such as seal group, gland 25, can block rock sediment in the well again, prevent that the rock sediment from reflecting out through the gap between main shaft 11 and the wall of a well, influencing rock sediment treatment effeciency.

The bearing set comprises a deep groove ball bearing 221 and a thrust bearing 222, the middle part of the main shaft 11 is provided with a limit step 115, the limit step 115 is an annular bulge, the deep groove ball bearing 221 and the thrust bearing 222 are respectively positioned at two sides of the limit step 115, one end of the deep groove ball bearing 221 and one end of the thrust bearing 222 are limited by the limit step 115, the other end of the deep groove ball bearing 221 and the other end of the thrust bearing 222 are limited by the wear-resistant sleeve 21, the deep groove ball bearing 221 and the thrust bearing 222 are prevented from moving in the axial direction of the main shaft 11 and influencing the rotating stability of the main shaft 11, the deep groove ball bearing 221 is sleeved at one side of the main shaft 11 close to the external air inlet assembly, the thrust bearing 222 is sleeved at one side of the main shaft 11 close to the positive circulation down-the-hole hammer, the main shaft 11 is ensured to rotate in the drilling process through two bearing structures, the bearing frame 24, the gland 25, the sealing set and the like can not rotate, and the main shaft wall and the sealing set are kept relatively static due to the friction force between the well wall and the sealing set, avoid causing wearing and tearing, improve the life of part.

The two sides of the sealing group are respectively contacted with the two pressing covers 25, the sealing group comprises a first sealing plate 27, a second sealing plate 26 and a plurality of limiting columns 28, preferably, the number of the limiting columns 28 is three, the three limiting columns 28 are uniformly and circumferentially arranged around the periphery of the main shaft 11, the first sealing plate 27 is arranged close to an external air inlet assembly, the second sealing plate 26 is arranged close to a positive circulation down-the-hole hammer, the hardness of the second sealing plate 26 is greater than that of the first sealing plate 27, rock slag can contact the second sealing plate 26 in the up-and-down process due to the fact that the second sealing plate 26 is close to the positive circulation down-the-hole hammer, the second sealing plate 26 is easily worn, the wear resistance of the second sealing plate 26 needs to be increased, in order to ensure the sealing property, the first sealing plate 27 is lower in hardness and can have larger deformation, and can be adapted to different well wall shapes, the sealing property is improved, preferably, the first sealing plate 27 and the second sealing plate 26 are both made of natural rubber, only through the regulation ratio, the hardness is different, second closing plate 26 is in order to increase the wearability, it presss from both sides cloth to have increased in the rubber the inside, the hardness is higher, spacing post 28 passes first closing plate 27 and second closing plate 26 in proper order, and first closing plate 27 and second closing plate 26 are stretched out respectively to the both ends of spacing post 28, the position that corresponds spacing post 28 on the gland 25 is equipped with the slot, the both ends of spacing post 28 stretch into respectively in the slot, and be used for the rotation of restriction sealing group, in order to guarantee the relative stillness of sealing group and the wall of a well.

As shown in fig. 5, one side of the wear-resistant sleeve 21, which is far away from the bearing set, is provided with a first notch 116, a position, corresponding to the first notch 116, on the side wall of the main shaft 11 is provided with a second notch, a flat key 29 is embedded in the first notch 116 and the second notch, the flat key 29 is fixedly connected to the main shaft 11 through a bolt, that is, the bolt and the flat key 29 are used for positioning the wear-resistant sleeve 21, so that a torque transmission effect is achieved, and the wear-resistant sleeve 21 can be ensured to rotate along with the main shaft 11.

As shown in fig. 7, a plurality of grooves 251 are formed in the outer wall of each gland 25, the grooves 251 penetrate through the glands 25 in the thickness direction of the glands 25, the positions of the grooves 251 on the two glands 25 correspond to one another, the grooves 251 are used for penetrating through a small-caliber drilling tool, preferably, the number of the grooves 251 is three, when drilling accidents such as drill sticking and drill burying occur on an unstable bottom layer, rubber corresponding to the positions of the grooves 251 on a sealing group can be damaged, the small-caliber drilling tool below the position of the groove 251 is used for performing accident handling, the accident handling capacity is improved, and further the working efficiency is improved.

Example two

As shown in fig. 9, the present embodiment provides a down-the-hole drilling apparatus, which comprises an air intake assembly, a forward circulation down-the-hole hammer and a cross joint in the first embodiment, wherein the air intake assembly comprises a power head, a high pressure gas distribution device and a double-wall drill rod 3 which are sequentially connected and communicated, gas moves downwards in an annular gap, rock slag moves upwards in a core pipe to form a reverse circulation down-the-hole principle, so that the forward circulation down-the-hole hammer and the reverse circulation down-the-hole principle are utilized, the advantages of the forward circulation down-the-hole hammer and the reverse circulation down-the-hole are combined, the production cost is reduced, the down-the-hole efficiency is improved, the power head is used for introducing high pressure gas into the high pressure gas distribution device, the double-wall drill rod 3 comprises an inner pipe 32 and an outer pipe 31 which are coaxially arranged, the outer pipe 31 is sleeved on the periphery of the inner pipe 32, one end of the outer pipe 31 extends into the main shaft 11 and is in threaded connection with the main shaft 11 to improve the connection stability, one end of the inner pipe 32 close to the core pipe 12, the high-pressure gas distributing device is used for guiding high-pressure gas into the annular gap 13 through the gap between the inner pipe 32 and the outer pipe 31, a sealing ring is arranged between the outer wall of the inner pipe 32 and the inner wall of the core pipe 12 to ensure that the high-pressure gas enters the annular gap 13, the high-pressure gas is prevented from entering the core pipe 12 to affect the back-out of rock slag, the drilling efficiency is improved, the sealing ring is used for preventing the high-pressure gas from entering the core pipe 12, the positive circulation down-the-hole hammer is arranged at one end, far away from the double-wall drill pipe 3, of the main shaft 11 and is in threaded connection with the inner wall of the main shaft 11, the connection stability is improved, and the positive circulation down-the-hole hammer is prevented from falling off in the drilling process to further influence the drilling efficiency.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. A crossover joint, comprising: including connecting pipe and wear-resisting subassembly, wear-resisting subassembly cover is located on the outer wall at connecting pipe middle part, the periphery of wear-resisting subassembly is used for contacting the wall of a well, the connecting pipe includes main shaft and core pipe, the main shaft can the wear-resisting subassembly internal rotation, the main shaft cover is located the core pipe periphery, just main shaft inner wall with form annular gap between the core pipe outer wall, annular gap's one end is used for the air outlet of intercommunication outside air inlet subassembly, and outside air inlet subassembly is used for sending into high-pressure air to in the annular gap, annular gap's the other end is used for with positive circulation down-the-hole hammer intercommunication, just high-pressure air is used for driving positive circulation down-the-hole hammer impact to creep into and blow up the interior rock sediment of well, still be equipped with into the sediment passageway on the connecting pipe, advance the sediment passageway be used for intercommunication in with the core pipe inner chamber, just advance the sediment passageway and be located between wear-resisting subassembly and the positive circulation down-the-hole hammer, the high-pressure gas can blow in rock slag in the well into the core pipe through the slag inlet channel, and the rock slag is guided out of the well through the core pipe.

2. The crossover joint of claim 1, wherein: an outer slag inlet is formed in part of the side wall of the main shaft and can be communicated with the inner cavity of the main shaft and the well; one end of the core pipe, which is close to the external air inlet assembly, is opened, one end of the core pipe, which is close to the positive circulation down-the-hole hammer, is closed, and an internal slag inlet is formed in the position, which corresponds to the external slag inlet, of the core pipe; a communicating pipe is arranged between the inner slag inlet and the outer slag inlet, one end of the communicating pipe is fixed on the side wall of the inner slag inlet, the other end of the communicating pipe is fixed on the side wall of the outer slag inlet, the inner slag inlet, the outer slag inlet and the communicating pipe form a slag inlet channel, and the slag inlet channel is not communicated with the annular gap.

3. The crossover joint of claim 2, wherein: the core pipe is a columnar pipe.

4. The crossover joint of claim 2, wherein: the upper end of main shaft is used for dismantling with outside air inlet subassembly and is connected, the lower extreme of main shaft is used for dismantling with positive circulation down-the-hole hammer and is connected.

5. The crossover joint of claim 1, wherein: the wear-resistant assembly comprises a bearing group, a bearing frame, a sealing group, two wear-resistant sleeves and two pressing covers, the bearing group is sleeved on the periphery of the main shaft, the main shaft can rotate in the bearing group, the bearing group is installed on the bearing frame, the wear-resistant sleeves are sleeved on the periphery of the main shaft and are respectively positioned at the two ends of the bearing group, the main shaft can drive the wear-resistant sleeves to rotate, rotary seals are arranged between the bearing frame and each wear-resistant sleeve, the inner walls of the rotary seals are contacted with the outer walls of the wear-resistant sleeves, the outer walls of the rotary seals are contacted with the inner walls of the bearing frame, one end of each rotary seal, which is far away from the bearing group, is respectively flush with the two ends of the bearing frame, each pressing cover is detachably connected with the two ends of the bearing frame respectively, and the two pressing covers are sleeved on the periphery of the bearing frame, the sealing group is located two between the gland, just the sealing group cover is located the bearing frame periphery, the inner wall of sealing group with the bearing frame outer wall contact, the outer wall of sealing group stretches out the gland is used for contacting the wall of a well.

6. The crossover joint of claim 5, wherein: the bearing assembly includes deep groove ball bearing and thrust bearing, the main shaft middle part is equipped with spacing step, deep groove ball bearing with thrust bearing is located respectively spacing step's both sides, just deep groove ball bearing cover is located one side that is close to outside air inlet subassembly on the main shaft, thrust bearing cover is located one side that is close to positive circulation down-the-hole hammer on the main shaft.

7. The crossover joint of claim 5, wherein: the two sides of the sealing group are respectively contacted with the two pressing covers, the sealing group comprises a first sealing plate, a second sealing plate and a plurality of limiting columns, the first sealing plate is used for being close to an external air inlet assembly, the second sealing plate is used for being close to a positive circulation down-the-hole hammer, the hardness of the second sealing plate is larger than that of the first sealing plate, the limiting columns sequentially penetrate the first sealing plate and the second sealing plate, the two ends of the limiting columns respectively extend out of the first sealing plate and the second sealing plate, the positions of the limiting columns corresponding to the pressing covers are provided with inserting grooves, and the two ends of the limiting columns respectively extend into the inserting grooves and are used for limiting the rotation of the sealing group.

8. The crossover joint of claim 5, wherein: one side of the wear-resistant sleeve, which is far away from the bearing group, is provided with a first notch, a position, corresponding to the first notch, on the side wall of the main shaft is provided with a second notch, a flat key is embedded in the first notch and the second notch, and the flat key is fixedly connected to the main shaft through a bolt.

9. The crossover joint of claim 5, wherein: the outer wall of each gland is provided with a plurality of grooves, the grooves penetrate through the glands in the thickness direction of the glands, the positions of the grooves on the two glands correspond to one another, and the grooves are used for penetrating through a small-caliber drilling tool.

10. A down-the-hole drilling apparatus characterized by: the air inlet assembly comprises a power head, a high-pressure gas distribution device and a double-wall drill rod which are sequentially connected and communicated, the power head is used for introducing high-pressure gas into the high-pressure gas distribution device, the double-wall drill rod comprises an inner pipe and an outer pipe which are coaxially arranged, the outer pipe is sleeved on the periphery of the inner pipe, one end of the outer pipe extends into the main shaft and is in threaded connection with the main shaft, one end, close to the core pipe, of the inner pipe extends into the core pipe, the high-pressure gas distribution device is used for guiding the high-pressure gas into the annular gap through the gap between the inner pipe and the outer pipe, a sealing ring is arranged between the outer wall of the inner pipe and the inner wall of the core pipe and is used for preventing the high-pressure gas from entering the core pipe, and the positive circulation down-hole hammer is arranged at one end, far away from the double-wall drill rod, of the main shaft, and is in threaded connection with the inner wall of the main shaft.