CN108505932B

CN108505932B - Power head

Info

Publication number: CN108505932B
Application number: CN201810424806.1A
Authority: CN
Inventors: 吴国明; 李星; 谢兆良
Original assignee: Shanghai Guangda Foundation Engineering Co ltd
Current assignee: Shanghai Guangda Foundation Engineering Co ltd
Priority date: 2018-05-07
Filing date: 2018-05-07
Publication date: 2023-07-18
Anticipated expiration: 2038-05-07
Also published as: CN108505932A

Abstract

A power head comprises two groups of power sources, a gear box, a frame, a proximity switch, a hydraulic rotary joint, a grouting rotary joint, a butt flange, a rotary disc and a built-in oil pipe combination, wherein a motor is fixedly arranged at the upper end of a planetary reducer; the two groups of power sources are symmetrically arranged on the gear box left and right; the drill rod shaft vertically passes through the gear box, and a large gear on the drill rod shaft is meshed with a small gear on an output shaft of the planetary reducer; the grouting rotary joint is fixedly arranged on the upper through cover of the gear box, and the hydraulic rotary joint is connected with the grouting rotary joint through a rotary disc; the built-in oil pipe assembly is arranged in an inner cavity of the output shaft, the upper end of the built-in oil pipe assembly penetrates through the grouting rotary joint and then is in butt joint with a rotating shaft of the hydraulic rotary joint, and the lower end of the built-in oil pipe assembly is fixedly arranged in a stepped counter bore of a female joint socket at the lower end of the butt joint flange through the inner joint seat; the output disc is screwed at the lower end of the hollow output shaft through a round nut. The invention has the characteristics of large drilling capability, real-time monitoring of drill rod speed, reasonable structure of grouting joints and hydraulic joints, reliable grouting and hydraulic pipeline sealing and the like.

Description

Power head

Technical Field

The invention relates to a power head, in particular to a power head of a hydraulic reaming drill for pile planting construction.

Background

Along with the continuous high-speed development of domestic economy, the construction of large projects such as high-speed railways, highways, large bridges, urban buildings, inter-urban subways, large comprehensive buildings and the like is further promoted, the surrounding environment of foundation construction is more and more complex, new requirements are put forward on pile foundation construction technology, two pile foundation types of the current general filling pile and precast pile are limited by construction technology, and certain application defects exist, such as incomplete pile circumferential side resistance in a soft soil foundation exists in the precast pile, the pile body strength cannot be fully exerted under vertical compressive load, the horizontal loading capacity is insufficient, the deformability is not high enough, the brittle failure is easy to occur, the soil compaction is serious in construction and the like, the filling pile is easy to neck, the pile bottom is free from sediment, the pile head of mud discharge and rejection in construction can pollute the environment and the like. The method needs to be advanced in technology, economical, reasonable, reliable in quality, low in carbon and environment-friendly. In the prior art, the static drilling root pile-planting construction technology is a novel pile foundation construction method of an embedded precast pile technology, integrates drilling, deep stirring, head expanding and prefabricating various pile foundation technologies, can combine PHDC, PHC, PRHC and other pile types differently, performs drilling, reaming, grouting and implantation, has the technical characteristics of no vibration, low noise, good pile-forming quality, high pile bearing capacity, small mud discharge, high construction mechanization degree, reliable quality, high construction efficiency and the like, effectively makes up the defects of the current soft soil foundation, meets the national low-carbon environment-friendly requirement, and can replace most of the current drilling and grouting piles. In construction, static drilling root planting pile is completed through drilling, reaming, stirring, grouting and other procedures, so that the pile planting method drilling machine is required to have reaming, stirring and grouting functions in a prefabricated hole, a corresponding conveying hydraulic pipeline and a grouting pipeline are required to be configured on a power head for driving a drill rod to rotate, and a hydraulic power source is provided for an expansion oil cylinder through a necessary hydraulic pipeline or a hydraulic pipeline, thereby realizing expansion drilling, shrinkage drilling and grouting of a reaming bit, and grouting and spraying of the drilling tool in the stirring process. In general, the grouting pipeline and the hydraulic pipeline are arranged on the drill rod, and the power head is provided with a grouting swivel connected with the grouting channel, so that the hydraulic swivel connected with the built-in hydraulic pipeline for opening and closing the reaming oil cylinder is arranged and arranged, and the effective connection between the grouting swivel and the hydraulic swivel and between the grouting swivel and the built-in hydraulic pipeline is a necessary guarantee for normal operation of the reaming drilling machine, and no effective mode or means exist in the prior art, so that the further expansion application of the pile planting drilling machine is affected.

Disclosure of Invention

The invention mainly aims to overcome the defects of the power head of the existing pile planting method drilling machine, and provides the power head which has the advantages of large output torque of a drill rod, strong drilling, real-time monitoring of the rotation speed of the drill rod, reasonable structure of a rotary grouting joint and a rotary hydraulic joint, high sealing performance of a built-in hydraulic pipeline and a grouting pipeline, convenience in assembling and disassembling the built-in oil pipe, convenience in maintenance, cleaning and storage of the rotary grouting joint and the rotary hydraulic joint, effective improvement of the working efficiency of a drilling machine and further improvement of the applicability of a reaming drilling machine.

In order to achieve the above object, the solution adopted by the present invention is:

a power head, comprising: two sets of symmetry sets up, has the power supply of frequency conversion double-speed motor and planetary reducer, and the gear box has the frame of hoist mechanism and back deflector, is located the proximity switch of frequency conversion double-speed motor and planetary reducer mounted position, hydraulic swivel joint, slip casting swivel joint, locating plate, gyration dish, butt flange and built-in oil pipe combination, wherein:

the planetary speed reducer of each group of power sources comprises a connecting flange and an output shaft with a pinion;

the gearbox comprises a drill rod shaft assembly, a box body, a box cover and a ventilation plug, wherein the drill rod shaft assembly comprises a hollow output shaft with an end face counter bore at the upper end, a large gear, a radial bearing, a second framework oil seal, a lower through cover, an upper through cover, an output disc and a round nut;

The butt flange is provided with a female joint socket at the lower end, a second horizontal semicircular groove which comprises a second step-shaped step, a third step-shaped step, a second horizontal semicircular groove and a locking screw hole, wherein the second step-shaped step and the third step-shaped step are positioned in the socket;

the grouting rotary joint comprises a joint upper sleeve, a joint outer sleeve, an outer sleeve bearing, an upper sleeve cover with a sleeve cover inner groove, an outer sleeve end cover, an oil storage ring, a deep groove ball bearing and a spacer ring, wherein the joint upper sleeve comprises an upper shaft neck, a middle shaft neck, a grouting screw hole positioned on the outer peripheral surface of the joint upper sleeve, a lower shaft neck, an upper sleeve first counter bore, an upper sleeve second counter bore, an upper sleeve third counter bore and a fixed screw hole positioned on the outer wall of the joint upper sleeve; the joint jacket comprises a jacket counter bore at the upper end of the joint jacket, a plurality of jacket ring grooves and jacket grooves at the inner wall of the joint jacket, and a jacket flange at the lower end of the joint jacket; the oil storage ring comprises a plurality of oil drain holes, an oil groove communicated with the oil drain holes, an inner ring groove positioned on the inner surface of the lower ring of the oil storage ring and an outer ring groove positioned on the outer surface of the middle ring of the oil storage ring;

the built-in oil pipe combination comprises a hydraulic core pipe, two transition connecting pipes with end ring grooves and a transition joint body two groups of internal joint assemblies and internal joint seats which are arranged in parallel; wherein, the liquid crystal display device comprises a liquid crystal display device,

The hydraulic core pipe is arranged in the grouting rotary joint and sequentially penetrates through an upper sleeve third counter bore, an upper sleeve second counter bore and an upper sleeve first counter bore of a joint upper sleeve of the grouting rotary joint, and comprises an upper end connector, a middle core pipe, a lower end core pipe joint, a plurality of brackets, a bracket through hole, two symmetrical fifth grouting holes and a bracket with bracket ring grooves, wherein the upper end connector is arranged at the upper part and provided with two upper joint oil channels and end external threads which are axially arranged in parallel; the lower joint flange is provided with two symmetrical fourth grouting holes and a lower flange ring groove;

the inner joint seat comprises a base with two symmetrical second jacks and second grouting holes, a flange which is connected below the base and provided with a second opposite notch, an inner seat flange groove positioned on the outer circle of the flange, an inner seat flange pin hole and an inner seat flange screw hole on the end face of the flange;

The inner joint assembly comprises a first inner joint, a guide sleeve, a guide rod, a second inner joint, a butterfly spring, a quick female joint, an elastic retainer ring, a first O-shaped ring, a framework seal, a second O-shaped ring and a third O-shaped ring; wherein, the liquid crystal display device comprises a liquid crystal display device,

the second inner joint is provided with a convex ring at the upper part of the outer wall, when the second inner joint is installed in the inner joint seat, the convex ring is placed on the top end of a base socket of the inner joint seat, and the outer wall of the second inner joint is divided into an upper fourth shaft neck and a lower inner external thread by taking the convex ring as a boundary; the second inner joint also comprises an inner two upper end counter bore serving as a two ring groove in an inner hole at the corresponding position of the fourth journal, and an inner two groove and an inner two ring groove are arranged on the outer wall opposite to the base of the inner joint seat;

the guide sleeve is sequentially provided with a sleeve internal thread, a sleeve middle through hole and a sleeve lower end counter bore from bottom to top, and also comprises a sleeve internal groove and a sleeve internal ring groove which are positioned on the inner wall of the sleeve lower end counter bore;

the guide rod bag is a stepped rod with a head and is provided with a shaft neck, a rod thread and a rod through hole;

an upper end counter bore, an inner thread, an inner middle step hole and an inner lower end counter bore are arranged in the inner hole of the first inner joint bag, and the first inner joint bag further comprises an inner ring groove positioned on the inner wall of the inner upper end counter bore;

The hydraulic swivel joint comprises a joint shell, a rotating shaft, a swivel joint cover plate and a positioning plate, wherein the joint shell comprises an oil inlet screw hole and an oil return screw hole which are positioned on the outer wall of the joint shell, an oil inlet ring groove and an oil return ring groove which are communicated with the oil inlet screw hole and the oil return screw hole and positioned on the inner wall of the joint shell, and a shell groove positioned on the outer wall of the joint shell; the rotating shaft comprises two rotating shaft straight oil channels, a rotating shaft transverse oil channel and a rotating shaft flange with a center step, wherein the rotating shaft straight oil channels and the rotating shaft transverse oil channels are axially arranged in the rotating shaft straight oil channels in parallel;

the positioning plate is provided with an upper end straight hook and a fixing hole positioned at the lower part;

the rotary disc is provided with a central screw hole and small screw holes uniformly distributed on the outer side;

the method is characterized in that:

the frame is a frame structure, and the lower part of the frame is fixedly arranged on the upper end surface of a box cover of the gear box; the lifting mechanism is fixedly arranged at the middle installation position of the upper platform of the frame; the guide plate is fixedly arranged on the back of the frame and is used for placing the frame on the configured pile frame guide rail by virtue of the notch of the guide plate so as to drive the frame to move downwards and upwards during construction of the pile planting drilling machine; the proximity switch is arranged on the side surface of the planetary reducer and is connected to a control panel of the driller control room through a signal wire;

the two groups of power sources are symmetrically arranged on the gear box left and right and are positioned on one side of the drill rod shaft assembly; each planetary reducer is fixedly arranged at each mounting position on the outer end face of the box cover of the gear box through a connecting flange; the output shaft of each planetary reducer enters the inner cavity of the box body of the gear box, a pinion on the output shaft is respectively meshed with a large gear on the drill rod shaft assembly, a bearing and a first framework oil seal are arranged at the other end of each output shaft and then are arranged in each mounting hole of the box body, and then, a small cover is also utilized to be packaged in each mounting hole; a variable-frequency double-speed motor is fixedly arranged above each planetary reducer;

The drill rod shaft assembly of the gear box is arranged on one side of the gear box in a mode of vertically penetrating through a box cover and a box body of the gear box, a large gear is fixedly arranged at a middle spline of a hollow output shaft of the drill rod shaft assembly, the radial bearing and the second framework oil seal are respectively sleeved at corresponding positions of the hollow output shaft and then are arranged in each mounting hole of the box body of the gear box, and the lower through cover and the upper through cover are respectively sleeved at the lower end and the upper end of the hollow output shaft and then are respectively arranged in each mounting hole of the box body of the fixedly-arranged gear box; the output disc is fixedly arranged at the lower spline of the lowest end of the hollow output shaft and is fastened by the round nut;

the butt flange is sleeved on the lower end step of the hollow output shaft and fixedly arranged with the output disc through bolts;

the grouting rotary joint is fixedly arranged on the upper through cover end face of a drill stem assembly of the gear box through an outer sleeve flange of a joint outer sleeve, the joint upper sleeve is sleeved in an inner hole of the joint outer sleeve through a sleeve lower journal and is partially positioned above the joint outer sleeve, lubricating grease is injected into a plurality of outer sleeve ring grooves opposite to the sleeve lower journal through a glib talker respectively, O-shaped rings are respectively arranged in outer sleeve grooves, and a bearing groove and a spacer ring are arranged on the hole wall, opposite to a middle journal, of the upper part of an outer sleeve counter bore of the joint outer sleeve; the outer sleeve end cover is fixedly arranged on the upper end face of the joint outer sleeve;

The upper sleeve second counter bore of the upper sleeve of the joint is provided with a ring groove opposite to the outer wall of the upper end connector of the hydraulic core tube, and an oil storage ring is arranged in the ring groove so as to be communicated with a plurality of oil drain holes and oil grooves, a lubricating oil film is formed between the upper sleeve of the joint and the upper end connector, an oil seal is arranged in the ring groove, and a deep groove ball bearing is arranged in the ring groove;

the grouting screw holes on the outer wall of the joint upper sleeve of the grouting rotary joint are connected with a grouting pipeline joint of an external grouting system, after cement slurry with a certain proportion is injected into the upper sleeve third counter bore sleeved on the joint, the cement slurry can sequentially pass through a fifth grouting hole on a bracket on a hydraulic core pipe in a counter bore on the end face of a hollow output shaft, a third grouting hole on a plurality of brackets, a fourth grouting hole on a lower joint flange, a hollow output shaft inner hole of a gear box and an outer hollow drilling tool inner hole to enter a tunneling and stirring soil layer, so that the construction program requirement of a pile planting drilling machine in the drilling and tunneling process is met;

in the arrangement of the built-in oil pipe combination, the rotary disc is screwed on the external thread at the end part of the upper end connector of the hydraulic core tube through the central screw hole of the rotary disc, the upper end connector passes through the upper end surface of the rotary disc and then is arranged in the central step of the rotating shaft flange of the rotating shaft of the hydraulic rotary connector, and O-shaped rings are arranged in the two end sinking pits of the upper end connector;

The first hydraulic pipe and the second hydraulic pipe of the middle core pipe inner cavity of the hydraulic core pipe are respectively connected and communicated with two upper joint oil passages of the upper joint, the middle core pipe is respectively arranged in the hole of the hollow output shaft after an O-shaped ring is arranged in a bracket ring groove through a bracket on the outer wall of the middle core pipe and is arranged or supported in the hole of the hollow output shaft after the O-shaped ring is arranged in the bracket ring groove through a plurality of brackets arranged on the outer wall below the bracket; the lower end core tube joint of the hydraulic core tube penetrates out of the holes of the hollow output shaft and the output disc, and is arranged in the mounting hole of the butt flange after an O-shaped ring is arranged in the lower flange ring groove through the lower joint flange;

after O-shaped rings are respectively arranged in ring grooves at the end parts of the two transition connecting pipes, the upper ends of the two transition connecting pipes are respectively arranged in two connecting counter bores of a core pipe joint at the lower end of a hydraulic core pipe, and the lower ends of the two transition connecting pipes are respectively arranged in two guide sleeves of an inner joint assembly;

the rotating shaft flange of the hydraulic rotating joint is connected with the rotating disc through a screw, and the hydraulic core tube is in contact connection with the rotating shaft; the two upper joint oil channels of the upper end connector of the hydraulic core tube are aligned and communicated with the two rotating shaft straight oil channels of the rotating shaft respectively; the joint shell is sleeved on the rotating shaft, and the rotary head cover plate is fixedly arranged on the upper end face of the joint shell; the oil inlet screw hole and the oil return screw hole are respectively connected with an oil inlet pipe and an oil return pipe from a hydraulic system, wherein an oil inlet pipeline is formed by an oil inlet ring groove of the joint shell, a transverse rotating shaft oil passage of the rotating shaft and a straight rotating shaft oil passage, and an oil return pipeline is formed by the oil return ring groove of the joint shell, the transverse rotating shaft oil passage of the rotating shaft and an inner rotating shaft oil passage;

The positioning plate is arranged in a shell groove of the outer wall of the joint shell of the hydraulic rotary joint through a straight hook at the upper end of the positioning plate, and is screwed with a bolt in a fixing hole at the lower part of the positioning plate to be sleeved on a fixing screw hole of the joint of the grouting rotary joint so as to be relatively fixed on the outer wall of the joint upper sleeve, thereby connecting the hydraulic rotary joint and the grouting rotary joint into a whole;

when a male joint body of a hollow drill rod from the outside is inserted into a female joint socket of a butt joint flange, a shaft neck of the male joint body is matched with a third step of the female joint socket, a first transverse semicircular groove positioned on the outer wall of the male joint body and a second transverse semicircular groove positioned on the inner wall of the female joint socket form a locking pin hole which is opposite to a locking bolt, the male joint body is locked after the locking bolt is inserted into the locking pin hole, and finally the male joint body is completely locked in the female joint socket after the locking bolt is screwed into the locking pin hole, so that the hollow drill rod at the upper part is firmly connected in the butt joint flange;

the lower end of the built-in oil pipe assembly is fixed at the bottom of a second step of a female joint socket of the butt flange in a mode of installing a lower end retainer ring on the outer side surface of an inner joint seat, a lower end sealing ring is installed in an inner seat flange groove, and an inner seat flange pin hole and an inner seat flange screw hole on the flange end surface of the inner seat flange groove are respectively positioned by a positioning pin and fastened by a screw;

The inner joint assemblies of the built-in oil pipe assembly are respectively inserted into two symmetrical second sockets in the inner joint seat through fourth shaft necks of the second inner joint and are fixed in a mode that elastic check rings are arranged in the inner two grooves, and a first O-shaped ring is arranged in the inner two ring grooves;

the guide rod passes through a sleeve lower end counter bore of the guide sleeve and an internal thread in the inner hole of the first inner joint through rod threads at the lower end of the guide rod, the rod shaft neck of the guide rod is arranged in the sleeve lower end counter bore of the guide sleeve, and a sleeve inner groove and a sleeve inner ring groove of the sleeve lower end counter bore are respectively provided with a framework seal and a third O-shaped ring;

the belleville springs are formed by overlapping one group of 2 plates and a plurality of groups of plates, and are arranged in the middle through hole of the sleeve of the guide sleeve and positioned between the upper end face of the guide rod and the lower end face of the second inner joint;

the guide sleeve is screwed on the internal and external threads at the lower end of the second inner joint through the sleeve internal threads at the upper end of the guide sleeve;

a second O-shaped ring is arranged in an annular groove of a counter bore at the inner upper end of the first inner joint; a quick female connector is arranged in a middle stepped hole in the first inner connector.

The invention can be that the parallelism tolerance requirement of the axial center lines of the two rotating shaft straight oil channels in the rotating shaft of the hydraulic rotating joint and the axial center lines of the two upper joint oil channels of the upper end connector of the hydraulic core tube is 0.08-0.10mm.

The invention can also be that the parallelism tolerance requirement of the axial center line of the two groups of inner joint assemblies of the built-in oil pipe combination relative to the outer circle of the flange of the inner joint seat is 0.08-0.10mm.

The invention can also be that after the belleville springs in the two groups of internal joint assemblies of the built-in oil pipe combination are assembled to the sleeve middle through hole of the guide sleeve, the initial pressing force is more than or equal to 2.0kN, and the pressing force after being compressed for 2.10mm is more than or equal to 4.0kN.

Drawings

FIG. 1 is a schematic diagram of a power head according to the present invention;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 1 with the frame removed;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a top view of FIG. 3;

FIG. 6 is a schematic diagram of the internal gear drive of the gearbox in the powerhead of the present invention;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 8 is a schematic structural view detail of the mounting connection between the built-in oil pipe assembly of FIG. 7 and the gearbox, docking flange, and output disc;

FIG. 9 is a schematic view of a portion of a nipple assembly and nipple mount of a built-in tubing assembly in a power head of the present invention;

FIG. 10 is a bottom view of FIG. 9;

FIG. 11 is a sectional view taken in the P-P direction of FIG. 9;

FIG. 12 is a schematic view of a part of a hydraulic swivel joint, a grouting swivel joint and a built-in oil pipe combined connection in a power head of the invention;

FIG. 13 is a sectional view taken along the direction D-D in FIG. 12;

FIG. 14 is a cross-sectional view taken along the direction F-F in FIG. 12;

FIG. 15 is a sectional view S-S of FIG. 14;

FIG. 16 is a J-J cross-sectional view of FIG. 7;

FIG. 17 is a cross-sectional view taken along line C-C of FIG. 8;

fig. 18 is an enlarged view of a portion a in fig. 14;

fig. 19 is an enlarged view of a portion B in fig. 14;

fig. 20 is an enlarged view of a portion C in fig. 14;

FIG. 21 is a cross-sectional view taken in the direction G-G of FIG. 13;

FIG. 22 is a cross-sectional view taken along B-B in FIG. 14;

fig. 23 is a schematic view of the structure of the oil reservoir of the rotary grouting joint in the present invention.

Detailed Description

The power head of the present invention will be further described with reference to the following examples of the drawings.

A power head, comprising: two groups of symmetrically arranged power sources 1 with a variable-frequency double-speed motor 11 and a planetary reducer 12, a gear box 8, a rack 3 with a lifting mechanism 31 and a back guide plate 32, a proximity switch 4 positioned at the installation positions of the variable-frequency double-speed motor and the planetary reducer, a hydraulic swivel joint 5, a grouting swivel joint 6, a positioning plate 53, a swivel plate 58, a butt flange 7 and a built-in oil pipe combination 2; wherein:

the planetary reducer 12 of each group of power sources 1 comprises a connecting flange 121 and an output shaft 122 with a pinion 1221; the gear box 8 comprises a drill rod shaft assembly 81, a box 83, a box cover 82 and a ventilation plug 84, wherein the drill rod shaft assembly 81 comprises a hollow output shaft 811 with an end face counter bore at the upper end, a large gear 812, a radial bearing 814, a second skeleton oil seal 815, a lower through cover 816, an upper through cover 817, an output disc 818 and a round nut 819.

The docking flange 7 has a lower female connector socket 72, a second stepped step 722 located within the socket or receptacle, a third stepped step 723, a second transverse semicircular slot 724 located in the inner wall thereof, and a locking screw 725 extending through the second transverse semicircular slot.

The grouting rotary joint 6 comprises a joint upper sleeve 61, a joint outer sleeve 62, an outer sleeve bearing 64, an upper sleeve cover 63 with a sleeve cover inner groove 631, an oil storage ring 66, a deep groove ball bearing 65 and a spacer ring 68, wherein the joint upper sleeve 61 comprises a sleeve upper journal 611, a middle journal 613, a grouting screw hole 610 positioned on the outer peripheral surface of the sleeve upper journal, a sleeve lower journal 612, an upper sleeve first counter bore 614, an upper sleeve second counter bore 616, an upper sleeve third counter bore 615 and a fixing screw hole 618 positioned on the outer wall of the sleeve upper journal; the joint jacket 62 includes a jacket counterbore 621 at its upper end, a plurality of jacket ring grooves 622 and jacket grooves 623 at its inner wall, and a jacket flange 624 at its lower end; the oil reservoir ring 66 includes a plurality of oil drain holes 661, an oil groove 662 communicating with the oil drain holes, an in-ring groove 663 located at an inner surface of a lower ring thereof, and an out-ring groove 664 located at an outer surface of a middle ring thereof.

The built-in oil pipe combination 2 comprises a hydraulic core pipe 21, two transition connecting pipes 26 with transition joint bodies 261 with end ring grooves, two groups of internal joint assemblies and an internal joint seat 250 which are arranged in parallel; wherein the hydraulic core tube 21 is installed in the grouting rotary joint 6 and sequentially passes through the upper sleeve third counterbore 615, the upper sleeve second counterbore 616 and the upper sleeve first counterbore 614 of the joint upper sleeve 61 of the grouting rotary joint 6, and comprises an upper joint straight oil passage 2131,2131' with two axially parallel arrangement, two upper end connecting heads 213 of an end countersink 2130,2130' and an end side external thread 2132 at the ports of the upper joint oil passages 2131,2131', a middle core tube 214 with a first hydraulic tube 2141 and a second hydraulic tube 2142 axially parallel arrangement at the middle part, and a lower core tube joint 212 with two connecting counterbores 2121, 2121' and a lower joint flange 2122 at the lower part, and further comprises a plurality of brackets 215 with a middle through hole 2151, two symmetrical third grouting holes 2153, 2153' and a bracket annular groove 2150, and a plurality of bracket annular grooves 2163, 3' and a bracket 2160 provided in the end face of the hollow output shaft 811 of the gear box 8 and having a bracket through hole 2161, two symmetrical fifth grouting holes 3, 3' and a bracket 2160; wherein, the lower joint flange 2122 is provided with two symmetrical fourth grouting holes 21223, 21223' and a lower flange ring groove 2120; the inner joint part 250 includes a base having two symmetrical second sockets 2501, 2501' and second grouting holes 2503, 2503' and a flange connected below the base and having opposite second notches 2502, 2502' thereon, the flange further having an inner seat flange recess 2506 on the outer circumference of the flange and inner seat flange pin holes 2504 and inner seat flange screw holes 2505 on the flange end faces.

The nipple assemblies each include a first nipple 251, a guide sleeve 253, a guide rod 252, a second nipple 255, a belleville spring 254, a quick box 256, a circlip 44, a first O-ring 55, a backbone seal 99, a second O-ring 77, and a third O-ring 88; wherein, the second inner joint 255 is provided with a convex ring at the upper part of the outer wall thereof, when being installed in the inner joint seat 250, the second inner joint 255 is placed on the top end of the base socket of the inner joint seat through the convex ring, and the outer wall thereof is divided into an upper fourth journal 2552 and a lower inner and outer thread 2553 by taking the convex ring as a boundary; the second inner joint 255 further comprises an inner two upper end counter bore 2555 serving as an inner hole in a corresponding position of the fourth journal 2552, and an inner two groove 25522 and an inner two ring groove 25521 which are arranged on the outer wall opposite to the base of the inner joint seat 250; the guide sleeve 253 is provided with a sleeve internal thread 2533, a sleeve middle through hole 2532 and a sleeve lower end counter bore 2531 in sequence from bottom to top, and the guide sleeve 253 also comprises a sleeve internal groove 25311 and a sleeve internal ring groove 25312 which are positioned on the inner wall of the sleeve lower end counter bore 2531; the guide rod 252 is a stepped rod with a head, having a rod neck 2522, rod threads 2521, and a rod through bore 2523; first inner joint 251 includes an inner upper counterbore 2514, an inner internal thread 2513, an inner middle step bore 2512, and an inner lower counterbore 2511, as well as an inner annular groove 25141 located on the inner wall of inner upper counterbore 2514.

The hydraulic swivel joint 5 is installed in the grouting swivel joint 6 and comprises a joint housing 51, a rotating shaft 52, a swivel head cover plate 54 and a positioning plate 53, wherein the joint housing 51 comprises an oil inlet screw hole 511 and an oil return screw hole 512 which are positioned on the outer wall of the joint housing, an oil inlet ring groove 5111 and an oil return ring groove 5121 which are positioned on the inner wall of the joint housing and are communicated with the oil inlet screw hole and the oil return screw hole 512, and a housing groove 515 positioned on the outer wall of the joint housing; the rotary shaft 52 includes two rotary shaft straight oil passages 521, 521 'axially disposed in parallel therein, a rotary shaft lateral oil passage 523,523', and a rotary shaft flange 522 having a center step 5220 at a lower portion thereof.

The positioning plate 53 has an upper end straight hook 531 and a fixing hole 532 at a lower portion.

The rotary plate 58 has a central screw hole 581 and small screw holes 582 uniformly distributed on the outer side.

The frame 3 is a frame framework, and the lower part of the frame is fixedly arranged on the upper end surface of a box cover 82 of the gear box 8; the lifting mechanism 31 is fixedly arranged at the middle installation position of the upper platform 33 of the frame 3; the guide plate 32 is fixedly arranged on the back surface of the frame 3 and is used for placing the frame 3 on the configured pile frame guide rail by virtue of a notch of the guide plate so as to drive the frame 3 to move downwards and upwards when the pile planting drilling machine is used for construction; the proximity switch 4 is arranged on the side surface of the planetary reducer 12 and is connected to a control panel of the driller control room through a signal wire; when the reaming and drilling machine drills, stirs and reams the in-process, proximity switch 4 can measure and control motor 11, cavity output shaft 811's rotation speed to in time transmit control panel through the pencil and show on the instant, make things convenient for operating personnel to monitor the operating condition of drilling machine, effectively control and drill, stir and reaming operation procedure, improve the construction quality of planting the stake operation.

The two groups of power sources 1 are symmetrically arranged on the gear box 8 left and right and are positioned on one side of the drill rod shaft assembly 21; each planetary reducer 12 is fixedly arranged at each installation position on the outer end surface of the box cover 82 of the gear box 8 through a connecting flange 121; the output shaft 122 of each planetary reducer 12 enters the box cavity of the gear box 8, the pinion 1221 on the output shaft is respectively meshed with the large gear 812 on the drill rod shaft assembly 81, the other end of each output shaft 122 is provided with a bearing 123 and a first framework oil seal 124 and then is arranged in each mounting hole of the box 83, and then, a small cover 125 is also utilized to be packaged in each mounting hole; a variable-frequency double-speed motor 11 is fixedly arranged above each planetary reducer 12; the impact of a load power grid can be reduced in the stage of starting the power head of the drilling machine, and the stable starting and working stability of the drilling machine are facilitated. In addition, the large gear 812 on the hollow output shaft is meshed by the small gears 1221 on the output shafts 122 of the two star reducers 12, so that the drilling machine has the characteristics of large output torque of the drill rod, strong and powerful drilling, and the like, the drilling, reaming and stirring efficiency of the drilling machine is greatly improved, and the applicability of the drilling machine is improved.

The drill rod shaft assembly 81 of the gear box 8 is arranged at one side of the drill rod shaft assembly 81 in a manner of vertically penetrating through a box cover 82 and a box body 83 of the gear box, a large gear 812 is fixedly arranged at a middle spline of a hollow output shaft 811 of the drill rod shaft assembly 81, the radial bearing 814 and the second framework oil seal 815 are respectively sleeved at corresponding positions of the hollow output shaft 811 and then are arranged in each mounting hole of the box body 83 of the gear box, and the lower through cover 816 and the upper through cover 817 are respectively sleeved at the lower end and the upper end of the hollow output shaft 811 and then are respectively arranged in each mounting hole of the box body 83 of the fixed gear box; the output disc 818 is secured to the lower spline of the lowermost end of the hollow output shaft 811 and is secured with the round nut 819.

The butt flange 7 is fixed to the output disk 818 by bolts after being fitted around the lower end step of the hollow output shaft 811.

The grouting rotary joint 6 is fixedly arranged on the end face of an upper through cover 817 of a drill rod shaft assembly 81 of the gear box 8 through a sleeve flange 624 of a joint sleeve 62, the joint upper sleeve 61 is sleeved in an inner hole of the joint sleeve 62 through a sleeve lower journal 612 and is partially positioned above the joint sleeve 62, lubricating grease is injected into a plurality of sleeve ring grooves 622 opposite to the sleeve lower journal 612 through a nozzle, O-shaped rings are respectively arranged in the sleeve grooves 623, and a bearing groove is formed in the hole wall of the upper part of a sleeve counter bore 621 of the joint sleeve 62 opposite to a middle journal 613 of the joint upper sleeve 61 and is internally provided with a sleeve bearing 64 and a spacer 68; the sleeve cap 67 is fixedly attached to the upper end surface of the joint sleeve 62.

The wall of the second counter bore 616 of the upper sleeve 61 opposite to the outer wall of the upper connector 213 of the hydraulic core tube 21 is provided with a ring groove and is provided with an oil storage ring 66 therein so as to be communicated with a plurality of oil drain holes 661 and oil grooves 662 to form a lubricating oil film between the upper sleeve 61 and the upper connector 213, an oil seal is arranged in the ring inner groove 663, and a deep groove ball bearing 65 is arranged in the ring outer groove 664;

The grouting screw hole 610 on the outer wall of the joint upper sleeve 61 of the grouting swivel joint 6 is connected with a grouting pipeline joint of an external grouting system, after a certain proportion of cement slurry is injected into the upper sleeve third counter bore 615 of the joint upper sleeve 61, the cement slurry can sequentially pass through the fifth grouting holes 2163, 2163 'on the bracket 216 on the hydraulic core pipe 21 in the counter bore of the end face of the hollow output shaft 811, the third grouting holes 2153, 2153' on the brackets 215 on the lower joint flange 2122, the inner holes of the hollow output shaft 811 of the gearbox 8 and the inner holes of the external hollow drilling tool flow into a tunneling stirring soil layer, so as to meet the construction program requirements in the drilling process of the pile planting drilling machine.

In the arrangement of the hydraulic core tube 21 of the built-in oil tube combination 2 penetrating through the counter bores, the rotary disc 58 is screwed on the external end thread 2132 of the upper end connector 213 of the hydraulic core tube 21 through the central screw hole 581, the upper end connector 213 penetrates through the upper end face of the rotary disc 58 and is then placed in the central step 5220 of the rotating shaft flange 522 of the rotating shaft 52 of the hydraulic rotary joint 5, and the O-rings are arranged in the two end sinking pits 2130,2130' of the upper end connector 213.

The first hydraulic pipe 2141 and the second hydraulic pipe 2142 in the inner cavity of the middle core pipe 214 of the hydraulic core pipe 21 are respectively connected and communicated with two upper joint straight oil passages 2131,2131' of the upper end joint 213, and the middle core pipe 214 passes through the bracket 216 on the outer wall of the middle core pipe and is placed in the end face counter bore of the hollow output shaft 811 after O-shaped rings are arranged in the bracket ring groove 2160; in addition, the central core tube 214 is disposed or supported in the bore of the hollow output shaft 811 by a plurality of brackets 215 on the outer wall below the bracket 216 and by O-rings mounted in bracket ring grooves 2150; the lower core tube joint 212 of the hydraulic core tube 21 passes through the holes of the hollow output shaft 811 and the output disc 818 and is placed in the mounting hole of the butt flange 7 after the O-ring is mounted in the lower flange ring groove 2120 by the lower joint flange 2122.

After the O-rings are respectively installed in the end ring grooves of the two transition connecting pipes 26, the upper ends of the two transition connecting pipes are respectively placed in the two connecting counter bores 2121, 2121' of the lower end core pipe joint 212 of the hydraulic core pipe 21, and the lower ends of the two transition connecting pipes are respectively placed in the two guide sleeves 253 of the inner joint assembly.

The rotating shaft flange 522 of the hydraulic rotating joint 5 is connected with the rotating disc 58 through screws and enables the hydraulic core tube 21 and the rotating shaft 52 to be in contact connection relatively; the two upper joint straight oil passages 2131,2131 'of the upper end connector 213 of the hydraulic core tube 21 are aligned with and communicated with the two rotating shaft straight oil passages 521, 521' of the rotating shaft 52 respectively; the joint housing 51 is sleeved on the rotating shaft 52, and the rotary head cover plate 54 is fixedly arranged on the upper end surface of the joint housing 51; the oil inlet screw hole 511 and the oil return screw hole 512 are respectively connected with an oil inlet pipe and an oil return pipe from the hydraulic system, wherein an oil inlet pipeline is formed by the oil inlet ring groove 5111 of the joint housing 51, the transverse rotary shaft oil passage 523 of the rotary shaft 52 and the straight rotary shaft oil passage 521, and an oil return pipeline is formed by the oil return ring groove 5121 of the joint housing 51, the transverse rotary shaft oil passage 523 'of the rotary shaft 52 and the inner rotary shaft oil passage 521'.

The positioning plate 53 is placed in the housing groove 515 of the outer wall of the joint housing 51 of the hydraulic swivel joint 5 through the straight hook 531 at the upper end thereof, and is fixed relatively to the outer wall of the joint upper sleeve 61 by screwing a bolt in the fixing hole 532 at the lower portion thereof to fix the fixing screw hole 618 of the joint upper sleeve 61 of the grouting swivel joint 6, thereby connecting the hydraulic swivel joint 5 and the grouting swivel joint 6 into a whole.

When the male connector body of the hollow drill rod from the outside is inserted into the female connector socket 72 of the butt flange 7, the male connector shaft neck is matched with the third step 723 of the female connector socket 72, the first transverse semicircular groove positioned on the outer wall of the male connector body is oppositely matched with the second transverse semicircular groove 724 positioned on the inner wall of the female connector socket 72 to form a locking pin hole, the locking pin hole is locked after the connector pin is inserted, and finally the male connector body is completely locked in the female connector socket 72 after the locking bolt is screwed into the locking pin hole, so that the hollow drill rod at the upper part is firmly connected in the butt flange 7.

The lower end of the built-in oil pipe assembly 2 is fixed at the bottom of the second step 722 of the female joint socket 72 of the butt flange 7 by installing a lower end retainer ring 2501 on the outer side surface of the inner joint seat 250, the inner seat flange groove 2506 is provided with a lower end sealing ring 259, and the inner seat flange pin hole 2504 and the inner seat flange screw hole 2505 on the flange end surface are respectively positioned and fastened by positioning pins and screws.

The inner joint assemblies of the built-in oil pipe combination 2 are respectively inserted into the second symmetrical sockets 2501, 2501' in the inner joint seat 250 through the fourth shaft neck 2552 of the second inner joint 255 and are fixed in a mode that the circlips 44 are arranged in the inner two grooves 25522, and the first O-shaped rings 55 are arranged in the inner two annular grooves 25521; the guide rod 252 is screwed with an internal thread 2513 in the inner hole of the first inner joint 251 through a rod thread 2521 at the lower end of the guide rod 252 penetrating through a sleeve lower end counter bore 2531 of the guide sleeve 253, a rod shaft neck 2522 of the guide rod 252 is placed in the sleeve lower end counter bore 2531 of the guide sleeve 253, and a sleeve inner groove 25311 and a sleeve inner ring groove 25312 of the sleeve lower end counter bore 2531 are respectively provided with a framework seal 99 and a third O-shaped ring 88; the belleville springs 254 are formed by overlapping one group of 2 pieces and overlapping a plurality of groups of belleville springs, are arranged in the sleeve middle through holes 2532 of the guide sleeve 253 and are positioned between the upper end face of the guide rod 252 and the lower end face of the second inner joint 255; the guide sleeve 253 is screwed on the internal and external threads 2553 at the lower end of the second inner joint 255 through the sleeve internal threads 2533 at the upper end of the guide sleeve; an inner annular groove 25141 of an inner upper end counterbore 2514 of first nipple 251 mounts second O-ring 77; a quick-connect coupling 256 is disposed in an inner intermediate stepped bore 2512 of the first nipple 251.

The parallelism tolerance of the axial center lines of the two shaft straight oil passages 521, 521 'in the shaft 52 of the hydraulic swivel joint 5 and the axial center lines of the two upper joint oil passages 2131, 2131' of the upper end joint 213 of the hydraulic core tube 21 is required to be 0.08-0.10mm. In this way, the sealing performance of the two rotary shaft straight oil channels 521, 521 'in the rotary shaft 52 and the two upper joint oil channels 2131, 2131' of the upper end connector 213 of the hydraulic core tube 21 can be effectively ensured when the hydraulic oil pressure of the hydraulic system reaches the required range when being conveyed in the hollow output shaft and the hollow drilling tool of the pile planting drilling machine, thereby ensuring the expansion and contraction operation of the reaming oil cylinder and carrying out reaming procedures on the pre-drilled holes according to the design requirements.

The parallelism tolerance requirement of the axial center line of the two groups of inner joint assemblies of the built-in oil pipe combination 2 relative to the flange excircle of the inner joint seat 250 is 0.08-0.10mm. After the belleville springs 254 in the two groups of inner joint assemblies of the built-in oil pipe combination 2 are assembled to the sleeve middle through holes 2532 of the guide sleeve 253, the initial pressing force is more than or equal to 2.0kN, and the pressing force after being compressed for 2.10mm is more than or equal to 4.0kN. Therefore, when the hollow drill rod from the outside is connected to the output end of the power head, the quick male connector of the two hydraulic pipelines in the external hollow drill rod is inserted into the quick female connector 256 of the built-in oil pipe assembly 2 in the hole of the butt flange 7, the quick male connector is inserted into place quickly and accurately, and the full and reliable butt joint is realized, and the quick male connector can be separated from the quick female connector 256 in time, so that the drill rod is convenient to detach, and the sealing performance of the hydraulic pipelines is effectively improved.

When the lower end of the butt flange 7 is connected with a hollow drill rod from the outside, the male connector body of the external drill rod is inserted into the female connector socket 72 of the butt flange 7, the quick male connectors of the two groups of external connector assemblies positioned in the inner holes of the external drill rod are inserted into the quick female connector 256 of the built-in oil pipe assembly 2 in the upper butt flange 7, and the external connector pushes the first internal connector 251 in the two groups of internal connector assemblies upwards and the guide rod 252 in threaded connection with the first internal connector 251, so that a acting force is applied and kept on the belleville spring 254 as a compensation stroke, thereby being beneficial to the communication of the built-in oil pipe; the construction of the grouting process can be started after the reaming operation is completed by forming a communicated cement slurry conveying pipeline through the third counter bore 615 at the upper end of the joint upper sleeve 61 of the grouting swivel joint 6, the fifth grouting holes 2163, 2163' on the bracket 216 on the hydraulic core pipe 21 which is positioned in the counter bore of the end face of the hollow output shaft 811, the inner hole of the hollow output shaft 811 and the third grouting holes 2153, 2153' on the plurality of brackets 215 which are arranged in the holes and the fourth grouting holes 21223, 21223' on the lower joint flange 2122, injecting cement slurry with a certain proportion into the holes which are finished by pre-drilling, pulling out all drill rods, pressing precast piles into the pre-drilled holes, and completing the pile planting operation after the cement slurry is completely combined with the precast piles.

The invention mainly aims to overcome the defects of the existing pile planting method drilling machine power head, and provides the power head which has the advantages of large output torque, powerful drilling, stable operation of a drill rod, real-time monitoring and control of the rotation speed of the drill rod, reasonable structure of a rotary grouting joint and a rotary hydraulic joint, built-in hydraulic pipelines and grouting pipelines and high sealing performance, is convenient for assembling and disassembling built-in oil pipes, is convenient for maintenance, cleaning and storage of the rotary grouting joint and the rotary hydraulic joint, effectively improves the operation efficiency of the drilling machine, and further improves the applicability of the reaming drilling machine.

Various changes and modifications may be made to the invention without departing from the general inventive concept, and, if the same or equivalent thereto is made, the invention is also within the scope of the invention.

Claims

1. A power head, comprising: two sets of symmetry set up, have power supply (1) of frequency conversion double-speed motor (11) and planetary reducer (12), gear box (8), frame (3) that have hoist mechanism (31) and back deflector (32), be located the proximity switch (4) of frequency conversion double-speed motor and planetary reducer mounted position, hydraulic swivel (5), slip casting swivel (6), locating plate (53), gyratory disc (58), flange (7) and built-in oil pipe combination (2), wherein:

The planetary speed reducer (12) of each group of power sources (1) comprises a connecting flange (121) and an output shaft (122) with a pinion (1221);

the gearbox (8) comprises a drill rod shaft assembly (81), a box body (83), a box cover (82) and an air permeable plug (84), wherein the drill rod shaft assembly (81) comprises a hollow output shaft (811) with an end face counter bore at the upper end, a large gear (812), a radial bearing (814), a second framework oil seal (815), a lower through cover (816), an upper through cover (817), an output disc (818) and a round nut (819);

the butt flange (7) is provided with a lower female joint socket (72), a second step (722) positioned in the socket, a third step (723), a second transverse semicircular groove (724) positioned on the inner wall of the middle part of the butt flange and a locking screw hole (725) communicated with the second transverse semicircular groove;

the grouting rotary joint (6) comprises a joint upper sleeve (61), a joint outer sleeve (62), an outer sleeve bearing (64), an upper sleeve cover (63) with a sleeve cover inner groove (631), an outer sleeve end cover (67), an oil storage ring (66), a deep groove ball bearing (65) and a spacer ring (68), wherein the joint upper sleeve (61) comprises an upper sleeve shaft neck (611), a middle shaft neck (613), a grouting screw hole (610) arranged on the outer peripheral surface of the joint upper sleeve shaft neck, a lower sleeve shaft neck (612), an upper sleeve first counter bore (614), an upper sleeve second counter bore (616), an upper sleeve third counter bore (615) and a fixing screw hole (618) arranged on the outer wall of the upper sleeve third counter bore; the joint jacket (62) comprises a jacket counter bore (621) at the upper end thereof, a plurality of jacket ring grooves (622) and jacket grooves (623) at the inner wall thereof, and a jacket flange (624) at the lower end thereof; the oil storage ring (66) comprises a plurality of oil drain holes (661), an oil groove (662) communicated with the oil drain holes, an inner ring groove (663) positioned on the inner surface of the lower ring of the oil storage ring, and an outer ring groove (664) positioned on the outer surface of the middle ring of the oil storage ring;

The built-in oil pipe assembly (2) comprises a hydraulic core pipe (21), two transition connecting pipes (26) of a transition joint body (261) with end ring grooves, two groups of internal joint assemblies and an internal joint seat (250) which are arranged in parallel; wherein, the liquid crystal display device comprises a liquid crystal display device,

the hydraulic core pipe (21) is arranged in the grouting rotary joint (6) and sequentially penetrates through an upper sleeve third counter bore (615), an upper sleeve second counter bore (616) and an upper sleeve first counter bore (614) of a joint upper sleeve (61) of the grouting rotary joint (6), and comprises an upper end countersink (2130,2130 ') with two axially parallel arranged upper joint oil channels (2131, 2131'), two upper end connectors (213) with end external threads (2132) at the ports of the upper joint oil channels (2131, 2131 '), a core pipe (214) with a first hydraulic pipe (2141) and a second hydraulic pipe (2142) which are axially parallel arranged in the middle part, a lower end core pipe joint (212) with two connecting counter bores (2121, 2121') and a lower joint flange (2122), a plurality of brackets (215) with middle through holes (2151), two symmetrical third grouting holes (2153 ') and a hollow bracket (216) with a ring groove (0), and a hollow bracket (216) with a fifth through hole (2163') which is arranged in the end face of the gear box (8) and provided with a symmetric ring groove (2163); wherein, the lower joint flange (2122) is provided with two symmetrical fourth grouting holes (21223, 21223') and a lower flange ring groove (2120);

The inner joint seat (250) comprises a base with two symmetrical second sockets (2501, 2501 ') and second grouting holes (2503, 2503 ') and a flange which is connected below the base and is provided with opposite second notches (2502, 2502 '), an inner seat flange groove (2506) positioned on the outer circle of the flange and an inner seat flange pin hole (2504) and an inner seat flange screw hole (2505) on the end face of the flange;

the inner joint assemblies comprise a first inner joint (251), a guide sleeve (253), a guide rod (252), a second inner joint (255), a belleville spring (254), a quick female joint (256), a circlip (44), a first O-shaped ring (55), a framework seal (99), a second O-shaped ring (77) and a third O-shaped ring (88); wherein, the liquid crystal display device comprises a liquid crystal display device,

the second inner joint (255) is provided with a convex ring at the upper part of the outer wall thereof, when being arranged in the inner joint seat (250), the second inner joint is placed on the top end of the base socket of the inner joint seat through the convex ring, and the outer wall thereof is divided into an upper fourth journal (2552) and a lower inner and outer thread (2553) by taking the convex ring as a boundary; the second inner joint (255) further comprises an inner two-groove (25522) and an inner two-ring groove (25521) which are arranged on the outer wall opposite to the base of the inner joint seat (250) and serve as inner two upper end counter bores (2555) in the inner holes at the corresponding positions of the fourth shaft neck (2552);

The guide sleeve (253) is provided with a sleeve internal thread (2533), a sleeve middle through hole (2532) and a sleeve lower end counter bore (2531) from bottom to top in sequence, and the guide sleeve (253) further comprises a sleeve internal groove (25311) and a sleeve internal annular groove (25312) which are positioned on the inner wall of the sleeve lower end counter bore (2531);

the guide rod (252) is a stepped rod with a head, and is provided with a rod journal (2522), rod threads (2521) and a rod through hole (2523);

an inner upper counter bore (2514), an inner thread (2513), an inner middle step hole (2512) and an inner lower counter bore (2511) are arranged in an inner hole of the first inner joint (251), and the inner joint further comprises an inner annular groove (25141) positioned on the inner wall of the inner upper counter bore (2514);

the hydraulic swivel joint (5) comprises a joint shell (51), a rotating shaft (52) and a swivel head cover plate (54), wherein the joint shell (51) comprises an oil inlet screw hole (511) and an oil return screw hole (512) which are arranged on the outer wall of the joint shell, an oil inlet ring groove (5111) and an oil return ring groove (5121) which are communicated with the oil inlet screw hole and the oil return screw hole and are arranged on the inner wall of the joint shell, and a shell groove (515) arranged on the outer wall of the joint shell; the rotating shaft (52) comprises two rotating shaft straight oil channels (521, 521 ') which are axially arranged in parallel, a rotating shaft transverse oil channel (523,523') and a rotating shaft flange (522) which is positioned at the lower part and provided with a center step (5220);

The positioning plate (53) is provided with an upper end straight hook (531) and a fixing hole (532) positioned at the lower part;

the rotary disc (58) is provided with a central screw hole (581) and small screw holes (582) uniformly distributed on the outer side;

the method is characterized in that:

the frame (3) is a frame framework, and the lower part of the frame is fixedly arranged on the upper end surface of a box cover (82) of the gear box (8); the lifting mechanism (31) is fixedly arranged at the middle installation position of the upper platform (33) of the frame (3); the guide plate (32) is fixedly arranged on the back of the stand (3) and is used for placing the stand (3) on the configured pile frame guide rail by virtue of the notch of the guide plate so as to drive the stand (3) to move downwards and upwards during construction of the pile planting drilling machine; the proximity switch (4) is arranged on the side surface of the planetary reducer (12) and is connected to a control panel of the drilling machine control room through a signal wire;

the two groups of power sources (1) are symmetrically arranged on the gear box (8) left and right and are positioned on one side of the drill rod shaft assembly (81); each planetary reducer (12) is fixedly arranged at each installation position on the outer end surface of a box cover (82) of the gear box (8) through a connecting flange (121) of the planetary reducer; the output shaft (122) of each planetary reducer (12) enters the box cavity of the gear box (8), a pinion (1221) on the output shaft is respectively meshed with a large gear (812) on the drill rod shaft assembly (81), a bearing (123) and a first framework oil seal (124) are arranged at the other end of each output shaft (122) and then are arranged in each mounting hole of the box (83), and then, a small cover (125) is also utilized to be packaged in each mounting hole; a variable-frequency double-speed motor (11) is fixedly arranged above each planetary reducer (12);

The drill rod shaft assembly (81) of the gear box (8) is arranged on one side of the gear box in a mode of vertically penetrating through a box cover (82) and a box body (83) of the gear box, a large gear (812) is fixedly arranged at a middle spline of a hollow output shaft (811) of the drill rod shaft assembly (81), a radial bearing (814) and a second framework oil seal (815) are respectively sleeved at corresponding positions of the hollow output shaft (811) and then are arranged in mounting holes of the box body (83) of the gear box, and a lower through cover (816) and an upper through cover (817) are respectively sleeved at the lower end and the upper end of the hollow output shaft (811) and then are arranged in mounting holes of the box body (83) of the fixed gear box; the output disc (818) is fixedly arranged at the lower spline of the lowest end of the hollow output shaft (811) and is fastened by the round nut (819);

the butt flange (7) is sleeved on the lower end step of the hollow output shaft (811) and fixedly arranged with the output disc (818) through bolts;

the grouting rotary joint (6) is fixedly arranged on the end face of an upper through cover (817) of a drill rod shaft assembly (81) of the gear box (8) through a sleeve flange (624) of a joint sleeve (62); the joint upper sleeve (61) is sleeved in an inner hole of the joint outer sleeve (62) through a sleeve lower journal (612) and is partially positioned above the joint outer sleeve (62), lubricating grease is injected into the multi-channel outer sleeve ring grooves (622) opposite to the sleeve lower journal (612) through oil nozzles, O-shaped rings are respectively arranged in the outer sleeve grooves (623), and a bearing groove and a spacer ring (68) are arranged on the hole wall, opposite to the middle journal (613) of the joint upper sleeve (61), of the upper part of an outer sleeve counter bore (621) of the joint outer sleeve (62); the outer sleeve end cover (67) is fixedly arranged on the upper end face of the joint outer sleeve (62);

The wall of the second counter bore (616) of the upper sleeve (61) of the joint, which is opposite to the outer wall of the upper end connector (213) of the hydraulic core tube (21), is provided with a ring groove and is provided with an oil storage ring (66) therein so as to be communicated with a plurality of oil drain holes (661) and oil grooves (662) to form a lubricating oil film between the upper sleeve (61) of the joint and the upper end connector (213), an oil seal is arranged in the ring groove (663), and a deep groove ball bearing (65) is arranged in the ring outer groove (664);

the grouting screw hole (610) on the outer wall of the joint upper sleeve (61) of the grouting rotary joint (6) is connected with a grouting pipeline joint of an external grouting system, after cement slurry with a certain proportion is injected into the upper sleeve third counter bore (615) of the joint upper sleeve (61), the cement slurry can sequentially pass through fifth grouting holes (2163, 2163 ') on a bracket (216) on a hydraulic core tube (21) in an end face counter bore of a hollow output shaft (811), third grouting holes (2153, 2153 ') on a plurality of brackets (215), fourth grouting holes (21223, 21223 ') on a lower joint flange (2122) and an inner hole of the hollow output shaft (811) of a gear box (8) to flow into an external hollow drilling tool inner hole to enter a tunneling stirring soil layer so as to meet the construction program requirements in the drilling process of a pile-planting drilling machine;

In the arrangement of penetrating through each counter bore, the hydraulic core tube (21) of the built-in oil tube combination (2) is screwed on an end external thread (2132) of an upper end connector (213) of the hydraulic core tube (21) through a central screw hole (581), the upper end connector (213) penetrates through the upper end face of the rotary disc (58) and then is placed in a central step (5220) of a rotating shaft flange (522) of a rotating shaft (52) of the hydraulic rotary connector (5), and O-shaped rings are arranged in two end sinking pits (2130,2130') of the upper end connector (213);

the first hydraulic pipe (2141) and the second hydraulic pipe (2142) of the inner cavity of the middle core pipe (214) of the hydraulic core pipe (21) are respectively connected and communicated with two upper joint oil channels (2131, 2131') of the upper end joint (213), the middle core pipe (214) is respectively arranged in an end face counter bore of the hollow output shaft (811) through a bracket (216) on the outer wall of the middle core pipe and after an O-shaped ring is arranged in a bracket ring groove (2160), in addition, the middle core pipe (214) is also arranged in or supported in a hole of the hollow output shaft (811) through a plurality of brackets (215) positioned on the outer wall below the bracket (216) and after the O-shaped ring is arranged in the bracket ring groove (2150); the lower end core pipe joint (212) of the hydraulic core pipe (21) penetrates out of the holes of the hollow output shaft (811) and the output disc (818), and an O-shaped ring is arranged in the lower flange ring groove (2120) through the lower joint flange (2122) and then is arranged in the mounting hole of the butt joint flange (7);

After O-shaped rings are respectively arranged in ring grooves at the end parts of the two transition connecting pipes (26), the upper ends of the two transition connecting pipes are respectively arranged in two connecting counter bores (2121, 2121') of a core pipe joint (212) at the lower end of a hydraulic core pipe (21), and the lower ends of the two transition connecting pipes are respectively arranged in two guide sleeves (253) of an inner joint assembly;

the rotating shaft flange (522) of the hydraulic rotating joint (5) is connected with the rotating disc (58) through screws and enables the hydraulic core tube (21) and the rotating shaft (52) to be in contact connection relatively; two upper joint oil passages (2131,2131 ') of the upper end connector (213) of the hydraulic core tube (21) are aligned and communicated with two rotating shaft straight oil passages (521, 521') of the rotating shaft (52) respectively; the joint shell (51) is sleeved on the rotating shaft (52), and the rotary head cover plate (54) is fixedly arranged on the upper end face of the joint shell (51); the oil inlet screw hole (511) and the oil return screw hole (512) are respectively connected with an oil inlet pipe and an oil return pipe from a hydraulic system, wherein an oil inlet pipeline is formed by an oil inlet ring groove (5111) of the joint shell (51), a transverse rotating shaft oil passage (523) of the rotating shaft (52) and a straight rotating shaft oil passage (521), and an oil return pipeline is formed by an oil return ring groove (5121) of the joint shell (51), a transverse rotating shaft oil passage (523 ') of the rotating shaft (52) and an inner rotating shaft oil passage (521');

The locating plate (53) is arranged in a shell groove (515) of the outer wall of the joint shell (51) of the hydraulic swivel joint (5) through a straight hook (531) at the upper end of the locating plate, and is relatively fixed with the outer wall of the joint upper sleeve (61) through screwing a bolt in a fixing hole (532) at the lower part of the locating plate and screwing a bolt in a fixing screw hole (618) of the joint upper sleeve (61) of the grouting swivel joint (6), so that the hydraulic swivel joint (5) and the grouting swivel joint (6) are connected into a whole;

when a male connector body of an external hollow drill rod is inserted into a female connector socket (72) of a butt flange (7), a male connector journal of the male connector body is arranged on a third step (723) of the female connector socket (72) in a matched manner, a first transverse semicircular groove positioned on the outer wall of the male connector body is opposite to a second transverse semicircular groove (724) positioned on the inner wall of the female connector socket (72) to form a locking pin hole, the male connector body is locked after the male connector pin is inserted, and finally the male connector body is completely locked in the female connector socket (72) after the locking bolt is screwed into the locking screw hole, so that the upper hollow drill rod is firmly connected in the butt flange (7);

the lower end of the built-in oil pipe assembly (2) is fixed at the bottom of a second step (722) of a female joint socket (72) of the butt flange (7) in a mode of installing a lower end retainer ring on the outer side surface of an inner joint seat (250), a lower end sealing ring (259) is installed on an inner seat flange groove (2506), and an inner seat flange pin hole (2504) and an inner seat flange screw hole (2505) on the flange end surface of the inner seat flange groove are respectively positioned by positioning pins and fastened by screws;

The inner joint assemblies of the built-in oil pipe combination (2) are respectively inserted into two symmetrical second sockets (2501, 2501') in the inner joint seat (250) through fourth journals (2552) of the second inner joint (255) and are fixed in a mode that elastic check rings (44) are installed in inner two grooves (25522), and first O-shaped rings (55) are installed in the inner two grooves (25521);

the guide rod (252) is screwed with an internal thread (2513) in an inner hole of the first inner joint (251) through a rod thread (2521) at the lower end of the guide rod and a sleeve lower end counter bore (2531) of the guide sleeve (253), a rod shaft neck (2522) of the guide rod is arranged in a sleeve lower end counter bore (2531) of the guide sleeve (253), and a sleeve inner groove (25311) and a sleeve inner ring groove (25312) of the sleeve lower end counter bore (2531) are respectively provided with a framework seal (99) and a third O-shaped ring (88);

the belleville springs (254) are formed by overlapping one group of 2 sheets and after overlapping, and are arranged in a sleeve middle through hole (2532) of the guide sleeve (253) and are positioned between the upper end face of the guide rod (252) and the lower end face of the second inner joint (255);

the guide sleeve (253) is screwed on the inner and outer threads (2553) at the lower end of the second inner joint (255) through the sleeve inner threads (2533) at the upper end of the guide sleeve;

A second O-ring (77) is arranged in an inner annular groove (25141) of an inner upper end counter bore (2514) of the first inner joint (251); a quick female connector (256) is arranged in an inner middle step hole (2512) of the first inner connector (251).

2. The power head according to claim 1, characterized in that the parallelism tolerance requirement of the axial center lines of the two rotary shaft straight oil channels (521, 521 ') in the rotary shaft (52) of the hydraulic rotary joint (5) and the axial center lines of the two upper joint oil channels (2131, 2131') of the upper end joint (213) of the hydraulic core tube (21) is 0.08-0.10mm.

3. The power head according to claim 1, characterized in that the parallelism tolerance requirement of the axial center line of the two sets of nipple assemblies of the built-in oil pipe combination (2) relative to the flange outer circle of the inner nipple mount (250) is 0.08-0.10mm.

4. The power head according to claim 1, characterized in that after the belleville springs (254) in the two groups of inner joint assemblies of the built-in oil pipe combination (2) are assembled to the sleeve middle through hole (2532) of the guide sleeve (253), the initial pressing force is more than or equal to 2.0kN, and the pressing force after being compressed by 2.10mm is more than or equal to 4.0kN.