Multi-shaft bidirectional mixing pile drilling machine

Abstract

The present application relates to a kind of multi-shaft bidirectional mixing pile drill, including power head, rotary joint, drill rod assembly and drill head assembly, power head includes power source, box, transmission gear set and output shaft assembly, power source is equipped with at least two, each power source corresponds a set of transmission gear set and is connected, and each set of transmission gear set corresponds a set of output shaft assembly and is connected;Output shaft assembly includes inner shaft and outer shaft, inner shaft is connected with the upper gear unit in transmission gear set, outer shaft is connected with the lower gear unit in transmission gear set, and bidirectional rotation is realized;Drill rod assembly includes inner rod and outer rod, inner rod is fixedly connected with inner shaft, outer rod is fixedly connected with outer shaft, and bidirectional rotation is realized;Drill head assembly includes inner drill head and outer drill head, inner drill head is fixedly connected with inner rod, outer drill head is fixedly connected with outer rod, and bidirectional rotation is realized;The present application realizes multi-shaft bidirectional mixing pile, and pile-forming efficiency is high, and method is flexible, and it is suitable for the bulk construction of spliced pile and interval pile.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a multi-shaft bidirectional mixing pile drilling machine. BACKGROUND

[0002] There are two pile forming methods for cement mixing piles according to the types of drill bits: one is unidirectional mixing pile forming, and the other is bidirectional composite mixing pile forming. It has been verified by the domestic and foreign construction markets that the bidirectional mixing pile technology can significantly improve the strength and uniformity of the mixing pile compared with the unidirectional mixing pile, and the pile quality is significantly improved. Since the end of the last century, many institutions at home and abroad have successively disclosed related patents of bidirectional mixing technology. However, there is no multi-shaft bidirectional mixing pile drilling machine at present, and the multi-shaft unidirectional mixing pile drilling machine has developed to a five-shaft or even more shaft drilling machine. The present application aims to fill the technical gap in this regard; especially in the construction process of spliced piles and interval piles, the current multi-shaft unidirectional mixing pile drilling machine adopts unidirectional mixing technology, therefore, the multi-shaft unidirectional mixing pile has the problems of low pile strength and poor uniformity, and the quality of the pile is difficult to be guaranteed, and the pile forming construction efficiency is low. SUMMARY

[0003] The purpose of the present application is to overcome the problems existing in the prior art, and to provide a multi-shaft bidirectional mixing pile drilling machine, which realizes multi-shaft bidirectional mixing technology pile forming, has high pile forming efficiency and flexible construction method, and is suitable for large-volume construction of spliced piles and interval piles.

[0004] The purpose of the present application is achieved by the following technical scheme: the multi-shaft bidirectional mixing pile drilling machine comprises a power head, a rotary joint, a drill rod assembly and a drill bit assembly, the power head comprises a power source, a box body, a transmission gear set and an output shaft assembly, the power source is provided with at least two or more, each power source corresponds to a set of transmission gear sets and is connected, and each set of transmission gear sets corresponds to a set of output shaft assemblies and is connected, and the transmission gear set is located in the box body; the output shaft assembly comprises an inner shaft and an outer shaft, the inner shaft is connected with an upper gear unit in the transmission gear set, the outer shaft is connected with a lower gear unit in the transmission gear set, and the inner shaft and the outer shaft are driven to rotate bidirectionally through the transmission gear set; the drill rod assembly comprises an inner rod and an outer rod, the inner rod is fixedly connected with the inner shaft, the outer rod is fixedly connected with the outer shaft, and the drill rod assembly is driven to rotate bidirectionally through the output shaft assembly; the drill bit assembly comprises an inner drill bit and an outer drill bit, the inner drill bit is fixedly connected with the inner rod, the outer drill bit is fixedly connected with the outer rod, and the drill bit assembly is driven to rotate bidirectionally through the drill rod assembly.

[0005] The power head comprises a box body and multiple groups of power sources, transmission gear sets and output shaft assemblies, the box body extends multiple groups of output shaft assemblies at the lower end, each group of output shaft assemblies is driven by a power source through a group of transmission gear sets, the inner shaft and the outer shaft of each group of output shaft assemblies drive the inner rod and the outer rod of the drill rod assembly to rotate in two directions respectively, and the inner rod and the outer rod drive the inner drill bit and the outer drill bit of the drill bit assembly to rotate in two directions respectively, so that the pile is formed by multi-shaft two-way stirring, the pile forming efficiency is high, the construction method is flexible, and the power head is suitable for large-volume construction of spliced piles and interval piles.

[0006] As preferred, the transmission gear set comprises an upper gear unit and a lower gear unit, the upper gear unit comprises a first driving gear, an inner shaft gear and a transition gear, the lower gear unit comprises a second driving gear and an outer shaft gear; the first driving gear and the second driving gear are coaxially arranged in an upper and lower mode and are connected and fixed with the power end of the power source to realize synchronous rotation; the first driving gear is meshed with the transition gear, the transition gear is meshed with the inner shaft gear, and the inner shaft gear is connected with the inner shaft; the second driving gear is meshed with the outer shaft gear, and the outer shaft gear is connected with the outer shaft; the transition gear, the coaxial upper and lower arrangement of the first driving gear and the second driving gear are arranged in the upper gear unit, so that the inner shaft and the outer shaft connected with the transmission gear set realize bidirectional rotation.

[0007] As preferred, the outer shaft is coaxially installed with the inner shaft, a sealing element is installed between the upper end of the outer shaft and the inner shaft, and oil-free bushings and thrust roller bearings distributed in an upper and lower mode are installed between the lower end of the outer shaft and the inner shaft; at least one upper slurry pipeline is installed in the through hole of the inner shaft, the upper slurry pipeline is fixed between the upper end of the inner shaft and the upper fixed seat, and the upper slurry pipeline is fixed between the lower end of the inner shaft and the lower fixed seat; through the arrangement of the above structure, the inner shaft and the outer shaft can realize bidirectional rotation.

[0008] As preferred, the outer rod is coaxially installed with the inner rod, a tapered roller bearing is installed between the upper end of the outer rod and the inner rod, and oil-free bushings and thrust roller bearings distributed in an upper and lower mode are installed between the lower end of the outer rod and the inner rod; at least one lower slurry pipeline is installed in the through hole of the inner rod, the lower slurry pipeline is fixed between the upper end of the inner rod and the upper fixed seat, and the lower slurry pipeline is fixed between the lower end of the inner rod and the lower fixed seat; through the arrangement of the above structure, the inner rod and the outer rod can realize bidirectional rotation.

[0009] As preferred, the inner rod comprises upper, middle and lower inner rods which are sequentially connected by welding, the outer rod comprises upper, middle and lower outer rods which are sequentially connected by welding, wherein the upper outer rod is installed with the upper inner rod through a tapered roller bearing, and the lower outer rod is installed with the lower inner rod through an oil-free bushing and a thrust roller bearing in up-down distribution; through the segmented arrangement of the inner and outer rods, the length of the inner and outer rods can be adjusted according to actual needs.

[0010] As preferred, the outer rod is coaxially installed with the inner rod, and the upper end of the outer drill bit is installed with the inner drill bit through a tapered roller bearing, and the lower end of the outer drill bit is installed with the inner drill bit through a tapered roller bearing and a thrust roller bearing in up-down distribution; through the above structure, the outer drill bit and the inner drill bit can be bidirectionally rotated.

[0011] As preferred, the inner drill bit comprises a top shaft, an inner blade shaft, a transition shaft and a drill bit body, which are sequentially connected through hexagonal insertion and pin shaft cooperation fixation from top to bottom, and a sealing sleeve is installed at the connection between the top shaft, the inner blade shaft, the transition shaft and the drill bit body; at least one lower through slurry passage is arranged in the inner drill bit, and the outlet of the lower through slurry passage is arranged on the drill bit body and / or the inner blade shaft; the outer drill bit comprises a lower rotating seat, an upper rotating seat and an outer frame blade welded body, the upper end of the outer frame blade welded body is sleeved on the upper rotating seat and fastened through bolts, the lower end of the outer frame blade welded body is sleeved on the lower rotating seat and fastened through bolts, the upper rotating seat is installed on the outer peripheral wall of the top shaft and is installed with a tapered roller bearing therebetween, and the lower rotating seat is installed on the outer peripheral wall of the transition shaft and is installed with a tapered roller bearing and a thrust roller bearing in up-down distribution therebetween; through the segmented arrangement of the inner and outer drill bits, the assembly and disassembly of the inner and outer drill bits are more convenient, and thus the transportation is also more convenient.

[0012] As preferred, the inner shaft extends out of the box body at the upper end, and the inner shaft is connected with the rotating inner shell of the rotating joint through hexagonal insertion and pin shaft cooperation fixation; the inner shaft and the outer shaft both extend out of the box body at the lower end, the inner shaft is connected with the inner rod through hexagonal insertion, and the outer shaft is connected with the outer rod through hexagonal insertion and pin shaft cooperation fixation; the inner rod is connected with the inner drill bit through hexagonal insertion, and the outer rod is connected with the outer drill bit through hexagonal insertion and pin shaft cooperation fixation; through the above structure, the output shaft assembly, the drill rod assembly and the drill bit assembly adopt modular design and are independent modules, which are convenient for disassembly, assembly and transportation; only the outer rod needs to be fixed through a pin shaft, and the inner rod is limited through a bearing and a connecting rod.

[0013] As preferred, the rotary joint comprises a rotary inner shell, an outer shell and an end cover, radial bearings are respectively installed at upper and lower ends between the rotary inner shell and the outer shell and are fixed by snap springs, the end cover is installed at the upper end of the rotary inner shell and the outer shell, the outer shell is provided with at least one external slurry pipe interface, the inner side of the outer shell communicating with the external slurry pipe interface is provided with a ring-shaped groove, both sides of the ring-shaped groove are respectively provided with a plurality of sealing grooves, sealing pieces are installed in the sealing grooves, the rotary inner shell is provided with at least one upper-through slurry passage, the upper-through slurry passage communicates with the ring-shaped groove, and the outlet of the upper-through slurry passage is located at the lower end of the rotary inner shell; through the above structure, relative rotation between the rotary inner shell and the outer shell can be realized, that is, the outer shell is fixed, the rotary inner shell rotates, and the external slurry pipe interface is arranged on the outer shell, so that slurry can enter the upper-through slurry passage through the interface via the ring-shaped groove.

[0014] As preferred, the outer shell is further provided with a plurality of lubricating passages, the plurality of lubricating passages are respectively located between adjacent sealing grooves, each lubricating passage is in communication with each other, and a plug is installed at the inlet of each lubricating passage; in this way, when lubricating between the inner shell and the outer shell, lubricating oil can be injected through the inlet of any one lubricating passage, which is more convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0016] Figure 2 is a rotary joint cross-sectional structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0017] Figure 3 is a power head cross-sectional structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0018] Figure 4 is a transmission gear set structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0019] Figure 5 is an output shaft assembly cross-sectional structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0020] Figure 6 is a drill rod assembly cross-sectional structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0021] Figure 7 is a drill head assembly overall structural schematic view of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0022] Figure 8is a drill bit assembly cross-sectional structure diagram of a multi-shaft bidirectional mixing pile drilling machine of the present application.

[0023] Figure 9 is an embodiment one structure diagram suitable for drilling multi-shaft continuous spliced bidirectional mixing piles of the present application.

[0024] Figure 10 is an embodiment two structure diagram suitable for drilling multi-shaft interval bidirectional mixing piles of the present application.

[0025] The reference signs in the drawings are as follows: 1, power head; 2, rotary joint; 3, drill rod assembly; 4, drill bit assembly; 2.1, rotary inner shell; 2.2, outer shell; 2.3, end cover; 2.4, clamping spring; 2.5, radial bearing; 2.6, sealing element; 2.7, plug; 2.8, external slurry pipe interface; 2.9, ring-shaped groove; 2.10, upper through slurry passage; 2.11, lubrication passage; 2.12, rotation-stopping rod; 1.1, power source; 1.2, box body; 1.2.1, upper cover; 1.2.2, intermediate body; 1.2.3, lower cover; 1.2.4, rotation-stopping frame; 1.3, transmission gear set; 1.4, output shaft assembly; 1.3.1, first drive gear; 1.3.2, second drive gear; 1.3.3, inner shaft gear; 1.3.4, outer shaft gear; 1.3.5, transition gear; 1.4.1, inner shaft; 1.4.2, outer shaft; 1.4.3, upper through slurry pipe; 1.4.4, upper fixed seat; 1.4.5, lower fixed seat; 1.4.6, oil-free bushing; 1.4.7, thrust roller bearing; 1.4.8, pin shaft; 3.1, inner rod; 3.2, outer rod; 3.3, lower through slurry pipe; 3.4, tapered roller bearing; 3.1.1, upper inner rod; 3.1.2, middle inner rod; 3.1.3, lower inner rod; 3.2.1, upper outer rod; 3.2.2, middle outer rod; 3.2.3, lower outer rod; 4.1, inner drill bit; 4.2, outer drill bit; 4.1.1, drill bit body; 4.1.2, transition shaft; 4.1.3, inner vane shaft; 4.1.4, top shaft; 4.1.5, sealing sleeve; 4.1.6, lower through slurry passage; 4.1.7, inner vane; 4.1.8, excavating vane; 4.2.1, lower rotary seat; 4.2.2, outer frame vane welded body; 4.2.3, upper rotary seat; 4.2.4, support plate; 4.2.5, outer vane. DETAILED DESCRIPTION

[0026] The present application will be described in detail below with reference to the accompanying drawings: as shown in the accompanying drawings Figures 1 to 8As shown, the present application comprises a power head 1, a rotary joint 2, a drill rod assembly 3 and a drill bit assembly 4, characterized in that the power head 1 comprises a power source 1.1, a box body 1.2, a transmission gear set 1.3 and an output shaft assembly 1.4, the power source 1.1 is provided with at least two, each power source 1.1 corresponds to a set of transmission gear set 1.3 and is connected, and each set of transmission gear set 1.3 corresponds to a set of output shaft assembly 1.4 and is connected, and the transmission gear set 1.3 is located in the box body 1.2; the output shaft assembly 1.4 comprises an inner shaft 1.4.1 and an outer shaft 1.4.2, the inner shaft 1.4.1 is connected with the upper gear unit in the transmission gear set 1.3, the outer shaft 1.4.2 is connected with the lower gear unit in the transmission gear set 1.3, and the inner shaft 1.4.1 and the outer shaft 1.4.2 are driven by the transmission gear set 1.3 to realize bidirectional rotation; the drill rod assembly 3 comprises an inner rod 3.1 and an outer rod 3.2, the inner rod 3.1 is fixedly connected with the inner shaft 1.4.1, the outer rod 3.2 is fixedly connected with the outer shaft 1.4.2, and the drill rod assembly 3 is driven by the output shaft assembly 1.4 to realize bidirectional rotation; the drill bit assembly 4 comprises an inner drill bit 4.1 and an outer drill bit 4.2, the inner drill bit 4.1 is fixedly connected with the inner rod 3.1, the outer drill bit 4.2 is fixedly connected with the outer rod 3.2, and the drill bit assembly 4 is driven by the drill rod assembly 3 to realize bidirectional rotation.

[0027] The rotary joint 2 comprises a rotary inner shell 2.1, an outer shell 2.2 and an end cover 2.3, radial bearings 2.5 are respectively installed at the upper and lower ends between the rotary inner shell 2.1 and the outer shell 2.2 and are limited and fixed by a clasp spring 2.4, and the end cover is installed at the upper end of the rotary inner shell 2.1 and the outer shell 2.2; the outer shell 2.2 is provided with at least one external slurry pipe interface 2.8, the inner side of the outer shell 2.2 communicating with the external slurry pipe interface 2.8 is provided with a ring-shaped groove 2.9, the two sides of the ring-shaped groove 2.9 are respectively provided with a plurality of sealing grooves, and sealing members 2.6 are installed in the sealing grooves; the rotary inner shell 2.1 is provided with at least one upper slurry passage 2.10, the upper slurry passage 2.10 communicates with the ring-shaped groove 2.9, the lower end of the rotary inner shell 2.1 is provided with a passage outlet, and a counterbore is arranged at the outlet; the outlet of the upper slurry passage 2.10 is located at the lower end of the rotary inner shell 2.1; the outer shell 2.2 is further provided with a plurality of lubricating passages 2.11, the plurality of lubricating passages 2.11 are respectively located between adjacent sealing grooves, each lubricating passage 2.11 is in communication with each other, and a plug 2.7 is installed at the inlet of each lubricating passage 2.11; lubricating oil can be injected through the inlet of any one lubricating passage 2.11 during lubrication.

[0028] The outer shell 2.2 is further provided with sealing grooves at both ends, the sealing members 2.6 are installed in the sealing grooves and form radial seals with the end cover 2.3 and the rotary inner shell 2.1 respectively.

[0029] The outer shell 2.2 is further provided with a sealing groove at both ends, the sealing members 2.6 are installed in the sealing grooves and form radial seals with the end cover 2.3 and the rotary inner shell 2.1 respectively.

[0030] End cover 2.3 is bolted to the rotating inner shell 2.1, two radial bearings 2.5 are installed between the rotating inner shell 2.1 and the outer shell 2.2, the lower radial bearing 2.5 is limited by the step of the rotating inner shell 2.1 and the outer shell 2.2, the upper radial bearing 2.5 is limited by the step of the outer shell 2.2 and the snap spring 2.4 installed in the snap spring groove on the upper end of the rotating inner shell 2.1, the sealing elements 2.6 at both ends of the outer shell 2.2 are used to protect the two radial bearings 2.5.

[0031] The rotating inner shell 2.1 is provided with a hexagonal male joint, two opposite faces of the hexagonal male joint are provided with semicircular pin shaft holes, the rotating inner shell 2.1 is connected, limited and fixed with the upper end of the inner shaft 1.4.1 through the semicircular pin shaft holes and by using the pin shaft 1.4.8.

[0032] The box body includes an upper cover 1.2.1, a lower cover 1.2.3 and an intermediate body 1.2.2, the upper cover 1.2.1 and the lower cover 1.2.3 are bolted to the intermediate body 1.2.2 respectively, the intermediate body 1.2.3 is provided with a partition plate in the middle, the partition plate divides the box body 1.2 into an upper cavity and a lower cavity. The upper end of the upper cover 1.2.1 of the box body is provided with a base, the power source 1.1 is installed on the base, and the power source 1.1 can be a hydraulic motor or a motor.

[0033] The transmission gear set 1.3 includes a first drive gear 1.3.1, a second drive gear 1.3.2, a transition gear 1.3.5, an inner shaft gear 1.3.3 and an outer shaft gear 1.3.4, the first drive gear 1.3.1, the transition gear 1.3.5 and the inner shaft gear 1.3.3 are arranged in the upper cavity of the box body 1.2, and the second drive gear 1.3.2 and the outer shaft gear 1.3.4 are arranged in the lower cavity of the box body 1.2. The first drive gear 1.3.1 and the second drive gear 1.3.2 are coaxially arranged above and below, the upper end of the shaft is connected with the power source 1.1, the power source 1.1 drives the two to rotate synchronously, and the lower end of the shaft passes through the partition plate of the intermediate body 1.2.2 and is connected with the lower cover 1.2.3. The second drive gear 1.3.2 is engaged with the outer shaft gear 1.3.4, the outer shaft gear 1.3.4 is connected with the outer shaft 1.4.2 of the output shaft assembly 1.4, the first drive gear 1.3.1 is engaged with the transition gear 1.3.5, the transition gear 1.3.5 is engaged with the inner shaft gear 1.3.3, and the inner shaft gear 1.3.3 is connected with the inner shaft 1.4.1 of the output shaft assembly 1.4, wherein the transition gear 1.3.5 plays a reverse role.

[0034] The output shaft assembly 1.4 includes an inner shaft 1.4.1, an outer shaft 1.4.2, an upper through-pulp pipeline 1.4.3, an upper fixed seat 1.4.4, a lower fixed seat 1.4.5, a sealing element 2.6, a thrust roller bearing 1.4.7 and an oil-free bushing 1.4.6.

[0035] The output shaft assembly 1.4 includes an inner shaft 1.4.1, an outer shaft 1.4.2, an upper through-pipe 1.4.3, an upper fixed seat 1.4.4, a lower fixed seat 1.4.5, a sealing element 2.6, a thrust roller bearing 1.4.7 and an oil-free bushing 1.4.6. The lower ends of the inner shaft 1.4.1 and the outer shaft 1.4.2 are provided with the oil-free bushing 1.4.6 and the thrust roller bearing 1.4.7 to ensure coaxial rotation of the inner shaft 1.4.1 and the outer shaft 1.4.2. The upper end of the outer shaft 1.4.2 is provided with a sealing groove, and the sealing groove is provided with the sealing element 2.6. The sealing element 2.6 forms a radial rotary seal with the outer circle of the inner shaft 1.4.1.

[0036] The upper end and the lower end of the inner shaft 1.4.1 extend out of the box body 1.2, and only the lower end of the outer shaft 1.4.2 extends out of the box body 1.2. The upper end of the inner shaft 1.4.1 is provided with a hexagonal female joint, which is connected to a male joint at the lower end of the rotary inner shell 2.1 of the rotary joint 2, and is fixed by a pin shaft 1.4.8.

[0037] The lower ends of the outer shaft 1.4.2 and the inner shaft 1.4.1 are provided with hexagonal male joints. Opposite two faces of the hexagonal male joint at the lower end of the outer shaft 1.4.2 are provided with semicircular pin shaft holes. The outer shaft 1.4.2 is connected to the upper outer rod 3.2.1 on the outer rod 3.2 by the semicircular pin shaft holes and the pin shaft 1.4.8.

[0038] The lower end of the outer shaft 1.4.2 is provided with a sealing groove, and the sealing groove is provided with the sealing element 2.6. When the drill rod assembly 3 is connected, the sealing element 2.6 forms a radial seal with the outer rod 3.2.

[0039] The upper through-pipe 1.4.3 is installed in the through-hole of the inner shaft 1.4.1, and the number of the upper through-pipes 1.4.3 is at least one. The upper end of the upper through-pipe 1.4.3 is limited by the upper fixed seat 1.4.4, and the lower end is limited by the lower fixed seat 1.4.5. The upper fixed seat 1.4.4 and the lower fixed seat 1.4.5 are respectively fastened to the upper end and the lower end of the inner shaft 1.4.1 by bolts. The upper end and the lower end of the radial wall of the upper through-pipe 1.4.3 are provided with sealing grooves, and the sealing grooves are provided with the sealing element 2.6. The sealing element 2.6 at the lower end forms a radial seal with the lower fixed seat 1.4.5, and the sealing element 2.6 at the upper end forms a radial seal with the counterbore of the outlet of the upper through-pipe 2.10 at the lower end of the rotary inner shell 2.1 of the rotary joint 2. The upper through-pipe 2.10 of the rotary inner shell 2.1 communicates with the upper through-pipe 1.4.3.

[0040] The drill rod assembly 3 includes an inner rod 3.1, a lower through-pipe 3.3, an upper fixed seat 1.4.4, a lower fixed seat 1.4.5, an outer rod 3.2, a tapered roller bearing 3.4, a thrust roller bearing 1.4.7, an oil-free bushing 1.4.6, a clasp spring 2.4 and a sealing element 2.6.

[0041] The inner rod 3.1 comprises an upper inner rod 3.1.1, a middle inner rod 3.1.2 and a lower inner rod 3.1.3, which are connected by welding, the upper inner rod 3.1.1 is provided with a hexagonal female joint at the upper end, and the lower inner rod 3.1.3 is provided with a hexagonal male joint at the lower end.

[0042] The outer rod 3.2 comprises an upper outer rod 3.2.1, a lower outer rod 3.2.3 and a middle outer rod 3.2.2, which are also connected by welding, the upper outer rod 3.2.1 is provided with a hexagonal female joint at the upper end, and the lower outer rod 3.2.3 is provided with a hexagonal male joint at the lower end, and the opposite two faces of the female joint of the upper outer rod 3.2.1 and the male joint of the lower outer rod 3.2.3 are provided with semicircular pin hole; the female joint of the upper outer rod 3.2.1 is connected to the outer shaft 1.4.2 through the semicircular pin hole and the pin 1.4.8 to facilitate the connection and limiting fixation of the upper outer rod 3.2.1, and the male joint of the lower outer rod 3.2.3 is connected to the upper rotating seat 4.2.3 through the semicircular pin hole and the pin 1.4.8 to facilitate the connection and limiting fixation of the lower outer rod 3.2.3.

[0043] The lower outer rod 3.2.3 is also provided with a sealing groove at the lower end, and the sealing groove is provided with a sealing element 2.6 to ensure the sealing of the connecting rod or the drill bit assembly 4.

[0044] The upper ends of the inner rod 3.1 and the outer rod 3.2 are respectively hexagonally inserted and matched with the lower ends of the inner shaft 1.4.1 and the outer shaft 1.4.2, wherein the outer shaft 1.4.2 and the upper outer rod 3.2.1 are fixed by the pin 1.4.8.

[0045] The lower through-pipe 3.3 is installed in the through hole of the inner rod 3.1, and the upper end and the lower end are respectively limited by the upper fixing seat 1.4.4 and the lower fixing seat 1.4.5, and the upper fixing seat 1.4.4 and the lower fixing seat 1.4.5 are respectively fastened with the upper end and the lower end of the inner rod 3.1 by bolts.

[0046] The upper end and the lower end of the lower through-pipe 3.3 are both provided with a sealing groove, and the sealing groove is provided with a sealing element 2.6, the lower end sealing element 2.6 forms a radial seal with the counterbore of the lower fixing seat 1.4.5, and the upper end sealing element 2.6 forms a radial seal with the counterbore of the lower fixing seat 1.4.5 at the lower end of the inner shaft 1.4.1, and the lower through-pipe 3.3 is communicated with the upper through-pipe 1.4.3 of the output shaft assembly 1.4.

[0047] The lower end of the inner rod 3.1 and the outer rod 3.2 is provided with a thrust roller bearing 1.4.7 and an oil-free bushing 1.4.6, and the upper end of the inner rod 3.1 and the outer rod 3.2 is provided with a tapered roller bearing 3.4. When assembling, the inner rod 3.1, the lower through-pipe channel 3.3, the upper fixed seat 1.4.4 and the lower fixed seat 1.4.5 are assembled first, then the thrust roller bearing 1.4.7 and the oil-free bushing 1.4.6 are assembled at the lower end of the inner rod 3.1, and then they are inserted into the outer rod 3.2 from the upper end, and then the tapered roller bearing 3.4 is assembled at the upper end of the inner rod 3.1 and the outer rod 3.2, and then the snap spring 2.4 is assembled in the outer rod snap spring groove for limiting, so that the drill rod assembly 3 forms an independent module, which is convenient for transportation, disassembly and assembly, and rod connection.

[0048] The drill bit assembly 4 includes an inner drill bit 4.1, an outer drill bit 4.2, a tapered roller bearing 3.4, a thrust roller bearing 1.4.7 and a sealing element 2.6. The inner drill bit 4.1 includes a top shaft 4.1.4, an inner blade shaft 4.1.3, a transition shaft 4.1.2, a drill bit body 4.1.1, a sealing sleeve 4.1.5, a sealing element 2.6 and a snap spring 2.4.

[0049] The drill bit body 4.1.1 is uniformly welded with at least two digging blades 4.1.8 on the circumference, and the digging blades 4.1.8 are processed with teeth or welded with cutting teeth, and the digging blades 4.1.8 are at a certain angle with the axis of the drill bit body 4.1.1, which is convenient for digging and overturning soil and increasing drilling efficiency.

[0050] The upper end of the drill bit body 4.1.1 and the lower end of the transition shaft 4.1.2 are respectively provided with matched hexagonal female joint and hexagonal male joint, and are fastened by a pin shaft 1.4.8. Similarly, the upper end of the transition shaft 4.1.2 and the lower end of the inner blade shaft 4.1.3 and the upper end of the inner blade shaft 4.1.3 and the lower end of the top shaft 4.1.4 are connected by using hexagonal male and female joint insertion and pin shaft 1.4.8 fastening.

[0051] The inner blade shaft 4.1.3 is axially welded with at least three groups of inner blades 4.1.7, and each group of inner blades 4.1.7 is uniformly distributed with at least two inner blades 4.1.7 in the circumferential direction, and the inner blades 4.1.7 are at a certain angle with the axis of the inner blade shaft 4.1.3, and the inclination direction and angle are consistent with the digging blades 4.1.8 on the drill bit body 4.1.1.

[0052] The inner drill bit 4.1 is internally provided with at least one lower through-pipe channel 4.1.6, and the outlet of the lower through-pipe channel 4.1.6 is arranged on the drill bit body 4.1.1 and / or the inner blade shaft 4.1.3.

[0053] The sealing sleeve 4.1.5 is provided at the position where the top shaft 4.1.4, the inner blade shaft 4.1.3, the transition shaft 4.1.2 and the drill bit body 4.1.1 communicate, and the sealing sleeve 4.1.5 is provided with sealing grooves at both ends, and the sealing grooves are provided with sealing elements 2.6, so as to ensure the sealing of the communication channel.

[0054] The outer drill bit 4.2 comprises an upper rotary seat 4.2.3, a lower rotary seat 4.2.1 and an outer frame blade welded body 4.2.2.

[0055] The upper rotary seat 4.2.3 is sleeved on the top shaft 4.1.4, and a tapered roller bearing 3.4 is arranged between the upper rotary seat 4.2.3 and the top shaft 4.1.4; the lower rotary seat 4.2.1 is sleeved on the transition shaft 4.1.2 and the drill bit body 4.1.1, and a tapered roller bearing 3.4 is arranged between the lower rotary seat 4.2.1 and the transition shaft 4.1.2, and a thrust roller bearing 1.4.7 is arranged between the lower rotary seat 4.2.1 and the drill bit body 4.1.1; the two tapered roller bearings 3.4 are arranged back to back, and can bear bidirectional axial load; the thrust roller bearing 1.4.7 can increase the rigidity when the drill bit is pulled out.

[0056] The drill bit body 4.1.1, the transition shaft 4.1.2 and the top shaft 4.1.4 are provided with sealing grooves on the outer circles, and the sealing grooves are provided with sealing elements 2.6; the sealing elements 2.6 and the upper rotary seat 4.2.3 and the lower rotary seat 4.2.1 form radial sealing, and lubrication channels are arranged at the sealing positions, so as to facilitate regular lubrication.

[0057] The outer frame blade welded body 4.2.2 is welded with at least two arc-shaped support plates 4.2.4 in the circumferential direction, and at least two outer blades 4.2.5 are welded in the axial direction of the support plates 4.2.4; the outer blades 4.2.5 are at an angle with the support plates 4.2.4, and the inclination direction of the outer blades 4.2.5 is opposite to the directions of the digging blades 4.1.8 of the drill bit body 4.1.1 and the inner blades 4.1.7 on the inner blade shaft; the upper end and the lower end of the outer frame blade welded body 4.2.2 are respectively sleeved on the upper rotary seat 4.2.3 and the lower rotary seat 4.2.1, and are fixed with the upper rotary seat 4.2.3 and the lower rotary seat 4.2.1 through bolts, so that the three can rotate synchronously relative to the inner drill bit 4.1.

[0058] The installation steps of the drill bit assembly 4 are as follows:

[0059] S1, the sealing sleeve 4.1.5 with the sealing element 2.6 is installed on the upper end and the lower end of the inner blade shaft 4.1.3, and then the inner blade shaft 4.1.3 and the outer frame blade welded body 4.2.2 are coaxially arranged with the blades interlaced with each other;

[0060] S2, the sealing element 2.6 is installed in the sealing groove of the top shaft 4.1.4, and then the top shaft 4.1.4 is sleeved with the upper rotary seat 4.2.3, the tapered roller bearing 3.4 is installed, and the snap spring 2.4 is installed in the snap spring groove at the upper end of the top shaft 4.1.4;

[0061] S3, install the sealing piece 2.6 in the sealing groove of the transition shaft 4.1.2, install the tapered roller bearing 3.4 at the bearing matching surface of the transition shaft 4.1.2, and then together with the lower rotary seat 4.2.1;

[0062] S4, respectively plug the assembly of step 1 and the assembly of step 2 and step 3, and fix with the pin shaft 1.4.8, and fix the outer frame blade welding body 4.2.2 with the upper rotary seat 4.2.3 and the lower rotary seat 4.2.1 with bolts;

[0063] S5, install the sealing sleeve 4.1.5 with the sealing piece 2.6 at the passage entrance of the drill bit body 4.1.1, and install the sealing piece 2.6 and the thrust roller bearing 1.4.7 in the sealing groove and the upper end bearing matching surface of the drill bit body 4.1.1, and then together with the combination of the previous four steps, plug and fix with the pin shaft 1.4.8.

[0064] The upper end of the top shaft 4.1.4 and the upper end of the upper rotary seat 4.2.3 are provided with hexagonal female joints, which are respectively plugged with the male joints at the lower ends of the inner rod 3.1 and the outer rod 3.2, and the outer rod 3.2 and the upper rotary seat 4.2.3 are fixed with the pin shaft 1.4.8.

[0065] The Figure 1 The Figure 8 The two-axis bidirectional stirring drill given is only one of the multi-axis bidirectional stirring, if three-axis or more axes are needed, only the corresponding number of power sources 1.1, transmission gear sets 1.3 and output shaft assemblies 1.4 need to be added in the power head, and with each added set of power sources 1.1, transmission gear sets 1.3 and output shaft assemblies 1.4, one more axis of bidirectional stirring drill can be converted.

[0066] The Figure 2 The Figure 5 The Figure 6 The Figure 8 The two slurry passage cases are shown, the number of slurry passages can be increased or decreased according to needs, and the connection mode of the slurry passages described in the application has universality.

[0067] The Figure 9 It is embodiment 1 of the application, mainly suitable for punching multi-axis continuous spliced bidirectional stirring piles, at this time the middle to middle distance of the pile is less than the diameter of the pile body, that is, the distance between the output shaft assemblies is less than the diameter of the drill bit assembly, this embodiment is also suitable for punching water curtain piles or cement soil continuous walls, has good piling efficiency, uniform pile body and high construction quality, and for the multi-axis bidirectional stirring pile drill of the application, adjacent drill bit assemblies need to have a certain height difference to avoid mutual interference.

[0068] Figure 10is embodiment 2 of the present application, mainly suitable for multi-axle interval bidirectional mixing pile, at this time, the interval of the pile is greater than the diameter of the pile body, that is, the distance between the output shaft assemblies is greater than the diameter of the drill head assembly, and in this case, mutual interference does not occur regardless of whether the drill head assemblies are at the same height.

[0069] The present application is not limited to the above-described embodiments, and any changes in shape or material composition are allowed, as long as the structure design provided by the present application is adopted, which is a deformation of the present application and should be considered within the protection scope of the present application.

Claims

1. A multi-axis bidirectional mixing pile drilling rig, comprising a power head (1), a rotary joint (2), a drill rod assembly (3), and a drill bit assembly (4), characterized in that, The power head (1) includes a power source (1.1), a housing (1.2), a transmission gear set (1.3), and an output shaft assembly (1.4). At least two power sources (1.1) are provided, each power source (1.1) corresponding to and connected to a set of transmission gear sets (1.3), and each set of transmission gear sets (1.3) corresponding to and connected to a set of output shaft assemblies (1.4). The transmission gear sets (1.3) are located within the housing (1.2). The output shaft assembly (1.4) includes an inner shaft (1.4.1) and an outer shaft (1.4.2). The inner shaft (1.4.1) is connected to the transmission gear set (1.3). The upper gear unit in .3) is connected, and the outer shaft (1.4.2) is connected to the lower gear unit in the transmission gear set (1.3), and the transmission gear set (1.3) drives the inner shaft (1.4.1) and the outer shaft (1.4.2) to achieve bidirectional rotation; the drill rod assembly (3) includes an inner rod (3.1) and an outer rod (3.2), the inner rod (3.1) is fixedly connected to the inner shaft (1.4.1), and the outer rod (3.2) is fixedly connected to the outer shaft (1.4.2), and the output shaft assembly (1.4) drives the drill rod assembly (3) to achieve bidirectional rotation; the drill bit assembly (4) The assembly includes an inner drill bit (4.1) and an outer drill bit (4.2). The inner drill bit (4.1) is fixedly connected to the inner rod (3.1), and the outer drill bit (4.2) is fixedly connected to the outer rod (3.2). The drill bit assembly (4) is driven by the drill rod assembly (3) to achieve bidirectional rotation. The rotary joint (2) includes a rotating inner shell (2.1), an outer shell (2.2), and an end cap (2.3). Radial bearings (2.5) are respectively installed at the upper and lower ends of the rotating inner shell (2.1) and the outer shell (2.2) and are limited and fixed by snap rings (2.4). The end cap is installed on the rotating inner shell (2.1) and the outer shell (3.2). The upper end of the outer shell (2.2); the outer shell (2.2) is provided with at least one external slurry pipe interface (2.8), and the inner side of the outer shell (2.2) communicating with the external slurry pipe interface (2.8) is provided with an annular groove (2.9), and several sealing grooves are provided on both sides of the annular groove (2.9), and a sealing element (2.6) is installed in the sealing groove; the rotating inner shell (2.1) is provided with at least one upper slurry passage (2.10), the upper slurry passage (2.10) communicating with the annular groove (2.9), and the outlet of the upper slurry passage (2.10) is located at the lower end of the rotating inner shell (2.1).

2. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The transmission gear set (1.3) includes an upper gear unit and a lower gear unit. The upper gear unit includes a first drive gear (1.3.1), an inner shaft gear (1.3.3), and a transition gear (1.3.5). The lower gear unit includes a second drive gear (1.3.2) and an outer shaft gear (1.3.4). The first drive gear (1.3.1) and the second drive gear (1.3.2) are arranged coaxially and vertically and are connected and fixed to the power end of the power source (1.1). To achieve synchronous rotation; the first drive gear (1.3.1) meshes with the transition gear (1.3.5), the transition gear (1.3.5) meshes with the inner shaft gear (1.3.3), and the inner shaft gear (1.3.3) is connected to the inner shaft (1.4.1); the second drive gear (1.3.2) meshes with the outer shaft gear (1.3.4), and the outer shaft gear (1.3.4) is connected to the outer shaft (1.4.2).

3. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The outer shaft (1.4.2) is coaxially mounted with the inner shaft (1.4.1), and a seal (2.6) is installed between the upper end of the outer shaft (1.4.2) and the inner shaft (1.4.1). An oil-free bushing (1.4.6) and a thrust roller bearing (1.4.7) distributed vertically are installed between the lower end of the outer shaft (1.4.2) and the inner shaft (1.4.1). At least one upper slurry pipe (1.4.3) is installed in the through hole of the inner shaft (1.4.1). The upper slurry pipe (1.4.3) is fixed to the upper end of the inner shaft (1.4.1) by an upper fixing seat (1.4.4), and the upper slurry pipe (1.4.3) is fixed to the lower end of the inner shaft (1.4.1) by a lower fixing seat (1.4.5).

4. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The outer rod (3.2) is coaxially mounted with the inner rod (3.1), and a tapered roller bearing (3.4) is installed between the upper end of the outer rod (3.2) and the inner rod (3.1). An oil-free bushing (1.4.6) and a thrust roller bearing (1.4.7) distributed vertically are installed between the lower end of the outer rod (3.2) and the inner rod (3.1). At least one lower slurry pipe (3.3) is installed in the through hole of the inner rod (3.1). The lower slurry pipe (3.3) is fixed to the upper end of the inner rod (3.1) by an upper fixing seat (1.4.4), and the lower slurry pipe (3.3) is fixed to the lower end of the inner rod (3.1) by a lower fixing seat (1.4.5).

5. The multi-axis bidirectional mixing pile drilling rig according to claim 4, characterized in that: The inner rod (3.1) includes an upper inner rod (3.1.1), a middle inner rod (3.1.2), and a lower inner rod (3.1.3), which are connected together by welding. The outer rod (3.2) includes an upper outer rod (3.2.1), a middle outer rod (3.2.2), and a lower outer rod (3.2.3), which are connected together by welding. A tapered roller bearing (3.4) is installed between the upper outer rod (3.2.1) and the upper inner rod (3.1.1), and an oil-free bushing (1.4.6) and a thrust roller bearing (1.4.7) distributed vertically are installed between the lower outer rod (3.2.3) and the lower inner rod (3.1.3).

6. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The outer drill bit (4.2) is coaxially mounted with the inner drill bit (4.1), and a tapered roller bearing (3.4) is installed between the upper end of the outer drill bit (4.2) and the inner drill bit (4.1). Tapered roller bearings (3.4) and thrust roller bearings (1.4.7) distributed vertically are installed between the lower end of the outer drill bit (4.2) and the inner drill bit (4.1).

7. The multi-axis bidirectional mixing pile drilling rig according to claim 6, characterized in that: The internal drill bit (4.1) includes a top shaft (4.1.4), an inner blade shaft (4.1.3), a transition shaft (4.1.2), and a drill bit body (4.1.1). The top shaft (4.1.4), the inner blade shaft (4.1.3), the transition shaft (4.1.2), and the drill bit body (4.1.1) are connected from top to bottom by a hexagonal insertion joint and a pin (1.4.8). A sealing sleeve (4.1.5) is installed at the connection between the top shaft (4.1.4), the inner blade shaft (4.1.3), the transition shaft (4.1.2), and the drill bit body (4.1.1). The internal drill bit (4.1) has at least one lower grouting channel (4.1.6), and the outlet of the lower grouting channel (4.1.6) is located in the drill bit body (4.1.1). The outer drill bit (4.2) includes a lower rotating seat (4.2.1), an upper rotating seat (4.2.3), and an outer frame blade welded body (4.2.2). The upper end of the outer frame blade welded body (4.2.2) is fitted onto the upper rotating seat (4.2.3) and fastened with bolts. The lower end of the outer frame blade welded body (4.2.2) is fitted onto the lower rotating seat (4.2.1) and fastened with bolts. The upper rotating seat (4.2.3) is mounted on the outer peripheral wall of the top shaft (4.1.4), and a tapered roller bearing (3.4) is installed between them. The lower rotating seat (4.2.1) is mounted on the outer peripheral wall of the transition shaft (4.1.2), and tapered roller bearings (3.4) and thrust roller bearings (1.4.7) distributed vertically are installed between them.

8. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The upper end of the inner shaft (1.4.1) extends outside the housing (1.2). The inner shaft (1.4.1) is connected to the rotating inner shell (2.1) on the rotary joint (2) by a hexagonal plug and a pin (1.4.8). The lower ends of the inner shaft (1.4.1) and the outer shaft (1.4.2) both extend outside the housing (1.2). The inner shaft (1.4.1) is connected to the inner rod (3.1) by a hexagonal plug, and the outer shaft (1.4.2) is connected to the outer rod (3.2) by a hexagonal plug and a pin (1.4.8). The inner rod (3.1) is connected to the inner drill bit (4.1) by a hexagonal plug, and the outer rod (3.2) is connected to the outer drill bit (4.2) by a hexagonal plug and a pin (1.4.8).

9. The multi-axis bidirectional mixing pile drilling rig according to claim 1, characterized in that: The outer casing (2.2) is also provided with a plurality of lubrication channels (2.11), which are located between adjacent sealing grooves. Each lubrication channel (2.11) is interconnected, and a plug (2.7) is installed at the entrance of each lubrication channel (2.11).

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