CN108868644B

CN108868644B - Power down-placed chain type drill bit of pile machine

Info

Publication number: CN108868644B
Application number: CN201810061142.7A
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-05-12
Filing date: 2018-01-22
Publication date: 2020-09-22
Anticipated expiration: 2038-01-22
Also published as: CN108868643A; CN109209243A; CN108868647A; CN108999575A; CN210217634U; CN108868646A; CN108868633A; CN109209244A; CN108999575B; CN108868646B; CN208024289U; CN108868635A; CN207905716U; CN208024291U; CN108999574A; CN108868634A; CN208024284U; CN207905717U; CN207905715U; CN208024290U

Abstract

The invention discloses a power-down chain type drill bit of a pile machine, which comprises a chain rack, wherein at least one chain type carrier is arranged on the chain rack, a plurality of cutting teeth are arranged on the chain type carrier, the outer ends of the cutting teeth protrude out of the chain type carrier and face the outer side of the chain type carrier, and a chain transmission mechanism is arranged between the chain type carrier and the chain rack so as to drive the chain type carrier to circumferentially rotate or reciprocate on the chain rack; the chain machine frame is positioned at the lower part of the drill rod, and a power device is arranged on the chain machine frame and connected with the chain transmission mechanism. The power is arranged under the pile driver, so that the safety hidden trouble caused by the fact that power is arranged at the top end of a pile driver frame is thoroughly solved, the power is arranged under the pile driver and matched with chain type cutting, soil bodies can be effectively cut, cement and the soil bodies can be more fully mixed into a whole, and the performance of the stirring pile is improved; the power lower part can be matched with the telescopic drill rod, so that the drill rod does not need to be connected, and the drilling efficiency is greatly improved.

Description

Power down-placed chain type drill bit of pile machine

The invention claims the priority of the application of the Chinese utility model patent with the application number of "2017205251560" and the name of "soil fully-stirred chain type drill bit" on the day of "05 and 12 in 2017, and simultaneously claims the priority of the application of the Chinese invention patent with the application number of" 2017113202359 "and the name of" pile machine chain type drill bit and pile machine "on the day of" 12 in 2017, 12 and 12, and the whole contents of the priority are combined in the application.

Technical Field

The invention belongs to the technical field of pile machine equipment, relates to cement stirring pile forming equipment, in particular to a pile machine, a chain type drill bit thereof and related parts or components, and particularly relates to a power downward-arranged pile machine chain type drill bit.

Background

The cement mixing pile foundation is an effective soft foundation treatment mode, and cement is generally used as a main agent of a curing agent, and is sprayed into a soil body by using a mixing pile machine and is fully mixed, so that the cement and the soil generate a series of physical and chemical reactions to harden soft soil and improve the foundation strength.

In the prior art, a rotary excavating pile machine is generally used for forming holes, a curing agent is sprayed through a guniting pipe on a drill bit, a hole-forming soil body is rotatably excavated and broken, and a cement soil reinforcing body is formed after the hole-forming soil body is stirred with the curing agent. The pile machine drill bit adopts the spiral blade to cut and crush soil, the size of the blade or the cutter head is larger, the size of cut rock soil is larger, and even a blocky phenomenon can occur, so that the following problems can be caused: firstly, in the manufacturing process of the concrete mixing pile, cement paste cannot enter 'lumpy rock soil', so that the lumpy rock soil exists in the concrete mixing pile, and the compression resistance and the bearing stress performance of the concrete mixing pile are obviously reduced; secondly, when the silt layer is drilled and dug and the concrete mixing pile is manufactured, a soil squeezing effect can occur, so that the bottom of the concrete mixing pile is hollow, and the phenomenon of 'floating pile' occurs, thereby causing the foundation of the cement mixing pile to be unstable. This will undoubtedly affect the quality of the pile.

The prior art also discloses chain cutter type stirring pile wall forming equipment which is provided with two chain cutter cutting box assemblies, wherein the chain cutter cutting box assemblies are provided with driving chain wheels, inertia wheels and chain rails, a plurality of groups of transverse cutters which are arranged at intervals are fixedly arranged on the chain rails through cutter racks, and the chain rails and the cutters on the chain rails are driven to rotate by the rotation of the driving chain wheels and the inertia wheels, so that the cutting and stirring of soil bodies are realized. The chain cutter type mixing pile wall forming equipment is mainly used for excavating groove type foundations, the chain cutter cutting box assembly is large in size, large in driving power and high in energy consumption, power of the chain cutter cutting box assembly is arranged at the top end of a pile machine frame, and therefore a transmission chain is long, power efficiency is low, and faults are prone to occurring. In addition, the transverse cutters with larger width are arranged on the caterpillar track, so that the technical problem of poor soil body smashing effect still exists.

In view of the above, there is a need for a new pile driver solution, and corresponding optimization and component or assembly structure.

Disclosure of Invention

The invention aims to solve the problems and provides a chain type drill bit of a pile machine placed under power.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pile machine chain type drill bit with power arranged downwards comprises a chain rack, wherein at least one chain type carrier is arranged on the chain rack, a plurality of cutting teeth are arranged on the chain type carrier, the outer ends of the cutting teeth protrude out of the chain type carrier and face the outer side of the chain type carrier, and a chain transmission mechanism is arranged between the chain type carrier and the chain rack so as to drive the chain type carrier to circumferentially rotate or reciprocate on the chain rack; the chain machine frame is positioned at the lower part of the drill rod, and a power device is arranged on the chain machine frame and connected with the chain transmission mechanism.

In the present invention, the "outer end of the cutting tooth" is referred to as "the end of the cutting tooth fixed to the chain carrier". For the chain carriers in a ring shape, "outside of the chain carriers" means a region other than the ring formed by the chain carriers; for strip-shaped chain carriers, "outside of the chain carriers" means outside the region in which the chain carriers themselves are located.

The existing pile machine generally arranges a power device at the top of a drill rod, the power device drives the drill rod to move downwards for excavation, and when the excavation depth is large, the drill rod needs to be spliced continuously. Not only is the cost high, but also the power required is very large, and the weight of the drill rod is also very large, and once the power stops, the drill rod is difficult to pull out of the pit. In order to overcome the defects, the chain machine frame is positioned at the lower part of the drill rod, and the chain machine frame is provided with a power device which is connected with the chain transmission mechanism.

In foretell stake machine chain drill bit, the chain carrier be the annular, chain drive including locate last sprocket and lower sprocket in the chain frame, the chain carrier around locate on last sprocket and the lower sprocket, last sprocket and/or lower sprocket link to each other with power device.

In the above-mentioned stake machine chain drill bit, the quantity of chain carrier be no less than two, wherein the traffic direction of at least two chain carriers is opposite, and the moment of torsion that each chain carrier gyration or reciprocal swing produced offsets each other or at least partially offsets.

In the chain type drill bit of the pile machine, the chain type carrier is annular, the chain type transmission mechanism comprises an upper chain wheel and a lower chain wheel which are arranged on a chain rack, the chain type carrier is wound on the upper chain wheel and the lower chain wheel, and the upper chain wheel and/or the lower chain wheel are connected with a power device; each lower chain wheel is arranged on the chain frame in equal height.

In the above-mentioned chain-type drill bit for the pile machine, a sealing structure is arranged between the upper chain wheel and/or the lower chain wheel and the power device, the upper chain wheel and/or the lower chain wheel connected with the power device is used as a driving chain wheel, and the driving chain wheel is fixedly arranged on an output main shaft of the power device.

In the above-mentioned stake machine chain drill bit, seal structure including setting up the sealed cowling between power device organism and drive sprocket, the first end fixed mounting of sealed cowling in power device organism, the second end suit of sealed cowling in power wheel axle sleeve, just be provided with static sealing element between the first end of sealed cowling and the power device organism, be provided with dynamic sealing element between the second end of sealed cowling and the power wheel axle sleeve.

In the above-mentioned stake machine chain drill bit, the dynamic seal component include the sealing washer, the sealing washer be located the sealed cowling inboard, and the sealing washer closely laminates with the inner peripheral surface of sealed cowling and power wheel axle sleeve outer peripheral surface simultaneously.

In the chain type drill bit of the pile machine, the sealing ring is sleeved on the power wheel shaft sleeve in a sliding mode, and a plurality of annular grooves are formed in the annular sealing surface of the inner periphery of the sealing ring, so that the sealing ring can deform along the axial direction of the power wheel shaft sleeve.

In the above-mentioned stake machine chain drill bit, the sealing washer periphery suit elastic ring, the elastic ring can the pressfitting the sealing washer with the sealed cowling.

In the chain type drill bit of the pile machine, at least two dynamic sealing elements are arranged, and an isolating ring sleeved on a shaft sleeve of the power wheel is arranged between the adjacent dynamic sealing elements.

Compared with the prior art, the chain type drill bit has the advantages that:

(1) the cutting teeth are changed from large size to small size, so that the stress is effectively reduced, the energy consumption is reduced, the effective area of the drill bit entering the soil body can be reduced by adopting chain stirring, the replacement rate of the original soil body can be reduced, and the pollution caused by slurry replacement is effectively reduced. And the position randomness of small-size and independent cutting tooth becomes strong, can arrange on stake machine drill bit chain cutter more rationally, can install more moreover on the same chain carrier the chain drill bit cutting tooth of stake machine, so not only the excavation efficiency of chain drill bit cutting tooth obtains improving, and ground crushing efficiency also further improves to can improve the structural strength of cement mixing pile, avoid appearing the floating pile, and show the extrusion that reduces peripheral ground.

(2) The drill bit is positioned at the lower part of the drill rod and is driven by the downward power (the power device is directly arranged on the drill bit), and the downward power thoroughly solves the safety hidden trouble caused by the power arranged at the top part of the frame of the pile machine, particularly the requirements of the torque force of the drill bit on the frame strength and the bending strength of the drill rod; reducing the diameter of the drill rod, so that a pile with a small hole diameter can be drilled; the torque can be more effectively transmitted by adopting the power lower-arranged drill bit, so that the power loss is reduced; the power requirement on the power device after the power is off becomes smaller, and the device can be easily driven even if only one-fiftieth of the existing power is available; the power lower part is matched with chain type cutting, so that soil bodies can be effectively cut, cement and the soil bodies can be more fully mixed into a whole, and the performance of the mixing pile is improved; the power lower part can be matched with the telescopic drill rod, so that the drill rod does not need to be connected, and the drilling efficiency is greatly improved.

Drawings

FIG. 1 is a schematic structural view of a chain drill bit of the pile machine of the present invention;

FIG. 2 is a schematic view of the chain drill bit of the pile machine of the present invention from another perspective;

FIG. 3 is a schematic view of the structure of FIG. 2 in another orientation;

FIG. 4 is an enlarged view of portion A of FIG. 1;

FIG. 5 is an enlarged view of portion B of FIG. 2;

FIG. 6 is a simplified illustration of a first arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 7 is a simplified illustration of a second arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 8 is a simplified illustration of a third arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 9 is a simplified illustration of a fourth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 10 is a schematic illustration of a fifth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 11 is a schematic view of a sixth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 12 is a simplified illustration of a seventh arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 13 is a simplified illustration of an eighth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 14 is a simplified illustration of a ninth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 15 is a simplified illustration of a tenth arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 16 is a simplified illustration of an eleventh arrangement of chain carriers on a chain frame for use in a chain drill bit of the pile machine of the present invention;

FIG. 17 is a schematic structural view of a soil mass agitation type chain drill of example 1;

FIG. 18 is a schematic view of the earth mass stirring type chain bit of FIG. 17 from another perspective;

FIG. 19 is a schematic view of the auxiliary cutting assembly of FIG. 17 from another perspective;

FIG. 20 is a schematic structural view of a soil mass agitation type chain drill of example 2;

FIG. 21 is a schematic view of the earth mass stirring chain bit of FIG. 20 from another perspective;

FIG. 22 is a schematic structural view of a soil mass stirring type chain bit according to example 3;

FIG. 23 is a schematic view of the earth mass stirring type chain bit of FIG. 22 from another perspective;

FIG. 24 is a schematic structural view of a soil mass agitation type chain drill of example 4;

FIG. 25 is a schematic view of the earth mass stirring type chain bit of FIG. 24 from another perspective;

FIG. 26 is a schematic structural view of a soil mass stirring type chain drill of example 5;

FIG. 27 is a schematic structural view of a soil mass stirring type chain bit according to example 6;

FIG. 28 is a schematic structural view of a soil mass stirring type chain bit according to example 7;

FIG. 29 is a schematic view showing the construction of a second soil stirring type chain drill bit according to example 7;

FIG. 30 is a schematic view of the earth mass stirring chain bit of FIG. 29 from another perspective;

FIG. 31 is a schematic view showing the construction of an endless chain used in the soil mass stirring type chain drill of example 8;

FIG. 32 is a schematic view of the construction of another form of endless chain used in the soil mass stirring type chain bit of example 8;

FIG. 33 is a schematic view showing a first distribution pattern of cutting carriers used in the soil stirring type chain bit of example 9;

FIG. 34 is a vertical projection of FIG. 33;

FIG. 35 is a schematic view showing a second distribution pattern of cutting carriers used in the soil stirring type chain bit of example 9;

FIG. 36 is a vertical projection of FIG. 35;

FIG. 37 is a schematic view showing a second distribution pattern of cutting carriers used in the soil stirring type chain bit of example 9;

FIG. 38 is a vertical projection of FIG. 37;

FIG. 39 is a schematic view showing a third distribution pattern of cutting carriers used in the soil mass stirring type chain bit of example 9;

FIG. 40 is a vertical projection of FIG. 39;

FIG. 41 is a schematic view showing a fourth distribution pattern of cutting carriers used in the soil stirring type chain bit of example 9;

FIG. 42 is a vertical projection of FIG. 41;

FIG. 43 is a schematic view showing a fifth mode of distribution of cutting carriers used in the soil stirring type chain bit of example 9;

FIG. 44 is a vertical projection of FIG. 43;

FIG. 45 is a vertical projection of FIG. 31;

FIG. 46 is an alternative perspective view of FIG. 31 taken in a vertical direction;

FIG. 47 is a schematic view of the construction of an endless chain used in a soil mass stirring type chain bit;

FIG. 48 is an enlarged view at C of FIG. 47;

FIG. 49 is another structural schematic view of an endless chain for use in the soil mass stirring type chain bit of FIGS. 17-32;

FIG. 50 is a schematic illustration of a first type of cutting tooth as applied to the drill bit of the pile machine of FIGS. 1-3;

FIG. 51 is a schematic illustration of a second type of cutting tooth as applied to the pile driver drill bit of FIGS. 1-3;

FIG. 52 is a schematic illustration of a third cutting tooth as applied to the pile driver drill bit of FIGS. 1-3;

FIG. 53 is a schematic illustration of a fourth cutting tooth as applied to the pile driver drill bit of FIGS. 1-3;

FIG. 54 is a schematic illustration of a fifth cutting tooth as applied to the drill bit of the pile machine of FIGS. 1-3;

FIG. 55 is a schematic view of the structure of FIG. 51 from another perspective;

FIG. 56 is a schematic structural view of a power plant sealing structure applied to a pile driver drill bit of the present invention;

FIG. 57 is a schematic view of the structure of FIG. 56 at the location of the seal ring;

FIG. 58 is an enlarged view of the seal ring of FIG. 57;

fig. 59 is an enlarged view of portion D of fig. 56;

fig. 60 is an enlarged view of a portion E in fig. 56.

In the figure: an annular chain 1, a chain frame 1a, a rod-shaped box body 1aa, a bending part 1ab, an inner inclined surface 1ac, an outer inclined surface 1ad, a driving chain wheel 1b, a shaft sleeve 1ba, an annular step 1bb, a first mounting hole 1bc, a guide surface 1bd, a driven chain wheel 1c, a chain plate 1d, an inner hexagonal socket head screw 1e, a spring washer 1f, a protruding structure 2, a cutting tooth 3, a cutting part 31, a notch 32, a mounting hole 33, a connecting part 34, a working part 35, a soil discharge surface 36, an auxiliary cutting assembly 4, a material conveying pipe assembly 5, a chain type cutting assembly 6, a slurry conveying pipe 7, a gas conveying pipe 8, an auxiliary chain 9, an auxiliary tooth 10, a driving mechanism 11, a transmission assembly 11a, a protective cover 11b, an output main shaft 11c, a driving mechanism body 11d, a flange 11e, a cover 11f, a body 11g, a fourth mounting hole 11h, a drill rod 100, a cutting carrier chain link 101, an inner, The chain transmission mechanism comprises a chain link outer plate 202, a chain link pin shaft 203, a chain transmission mechanism 204, a power device 205, a sealing cover 300, an annular inner stop ring 301, a first end 302, a second end 303, a first annular end face 304, a second annular end face 305, a connecting face 306, a third mounting hole 307, an annular outer stop ring 400, a cover body 401, an extension portion 402, a fastening bolt 403, a sealing ring 500, an annular notch 501, an annular groove 502, an annular sealing face 503, an elastic ring 600 and a spacer ring 700.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 3 and 17 to 23, the chain drill of the pile machine of the present embodiment is a soil fully-stirring type chain drill, and includes a chain frame 1a, the chain frame 1a is connected to a drill rod 100 and located at a lower portion of the drill rod 100, wherein the drill rod 100 may be a single-section or multi-section telescopic structure; the chain rack 1a is provided with at least one chain carrier, the chain carrier is provided with a plurality of protruding structures for cutting soil, the protruding structures can be cutting teeth 3, and the outer ends of the cutting teeth 3 protrude out of the chain carrier; the chain machine frame 1a is provided with a power device 205, wherein the power device 205 is connected with a chain transmission mechanism 204, and the chain transmission mechanism 204 is used for driving the chain carrier to rotate or swing back and forth on the chain machine frame 1a in the circumferential direction.

The drill bit of the embodiment is positioned at the lower part of the drill rod 100 and is driven by the downward power (the power device is directly arranged on the drill bit), and the downward power thoroughly solves the safety hidden trouble caused by the power arranged at the top part of the frame of the pile machine, particularly the requirements of the torque force of the drill bit on the frame strength and the bending strength of the drill rod; reducing the diameter of the drill rod, so that a pile with a small hole diameter can be drilled; the torque can be more effectively transmitted by adopting the power lower-arranged drill bit, so that the power loss is reduced; the power requirement for the power device 205 becomes smaller after the power is off, and even if only one-fiftieth of the existing power can be easily driven; the power lower part is matched with chain type cutting, so that soil bodies can be effectively cut, cement and the soil bodies can be more fully mixed into a whole, and the performance of the mixing pile is improved; the power lower part can be matched with the telescopic drill rod, so that the drill rod does not need to be connected, and the drilling efficiency is greatly improved.

In this embodiment, the chain-type carrier may be a chain, or may be replaced by other chain-type carriers with a structure such as a crawler belt and a chain; instead of being endless, the chain carriers may also be strip-shaped. Wherein, when the chain carrier is annular or bar chain, its structure and function are: when the chain is an annular chain 1, the chain is supported on the corresponding driving chain wheel 1b and the corresponding driven gear 1c in a surrounding manner, can rotate, and drives the cutting teeth 3 to move in the rotating process to realize excavation; when the chain is a strip chain, two ends of the chain are fixed and wound on the corresponding driving chain wheel 1b or driven chain wheel 1c respectively, or the chain is connected with a cam structure, so that the chain can reciprocate, and the cutting teeth 3 are driven to move in the reciprocating motion process to realize excavation.

The cutting teeth 3 in this embodiment may be saw-blade-shaped multi-tooth structures, or blade-shaped non-tooth or less-tooth structures (for convenience of description, the latter will sometimes be referred to as "cutter" in this application), and the cutting teeth 3 of both structures may be bent or twisted to one side of the chain carrier running direction, thereby increasing the equivalent cutting width of the cutting teeth 3.

Without loss of generality, in the following description, the present embodiment takes the endless chain 1 as an example, and describes a pile machine chain type drill.

The chain transmission mechanism 204 of the present embodiment includes a driving sprocket 1b and a driven sprocket 1c disposed on the chain frame 1a, and the endless chain 1 is wound around the driving sprocket 1b and the driven sprocket 1 c. Here, the mounting positions of the driving sprocket 1b and the driven sprocket 1c on the chain frame 1a are not limited, such as: the driving sprocket 1b may be located above the driven sprocket 1c or below the driven sprocket 1 c. In addition, two driving sprockets 1b can be provided at the same time, and when two driving sprockets 1b are provided, a differential is used, and the differential is provided between the two driving sprockets 1 b.

In this embodiment, the chain frame 1a functions as a bearing member of the endless chain 1, and thus, the form thereof may be various, specifically, a connecting seat, a flange, a connecting frame, and the like. For example, the chain machine frame 1a may be an integrally arranged, multi-segment bent rod-shaped box mechanism as shown in fig. 1 to 3 (for simplicity, when the following description refers to the chain machine frame 1a, the short term "drill bit seat" is also used), and the drill bit seat has the advantages of facilitating the layout of the plurality of endless chains 1 and avoiding interference; of course, other configurations are possible, subject to suitable arrangement of the endless chain 1.

When the chain frame 1a structure shown in fig. 1 to 3 is adopted, a plurality of (preferably a plurality of) endless chains 1 are installed on the chain frame 1a, and the power device 205 may be directly disposed in the box body of the chain frame 1 a. Namely, a driving scheme with a power down is adopted, and at this time, the sealing needs to be optimized, and specific contents can be further referred to the following description of the sealing structure of the power device.

As shown in fig. 1 to 3, the power device 205 includes a plurality of driving mechanisms 11 (which may be hydraulic motors or electric motors, etc.), the driving mechanisms 11 are correspondingly connected to the driving sprockets 1b of the respective endless chains 1, and each driving mechanism 11 is provided with a driving sprocket 1b for driving one endless chain 1; and the driving mechanism 11 is sequentially arranged on the chain rack 1a from top to bottom, so that the requirement of spatial layout on the chain rack 1a is met. The power unit 205 is provided with a plurality of driving mechanisms 11 for independently controlling the running direction and speed of each endless chain 1.

Here, it should be understood by those skilled in the art that a certain gap should be left between the different driving mechanisms 11. Specifically, the driving mechanisms 11 are sequentially arranged on the chain frame 1a from top to bottom, so that the driving mechanisms 11 can be longitudinally arranged, and the transverse size of the whole drill bit can be reduced.

When the chain frame 1a structure shown in fig. 1 to 3 is adopted, the chain frame 1a includes at least two rod-shaped boxes (for example, the chain frame 1a shown in fig. 2 includes four sections), each rod-shaped box 1aa can be located on different planes, and the two adjacent rod-shaped boxes 1aa are connected through a bending part 1 ab; the bending directions of the adjacent bending portions 1ab may be the same, or may be partially the same or partially opposite (for example, in fig. 1, the first, second, and third sections are bent toward the first side, and the fourth section is bent toward the other side), and each driving mechanism 11 is disposed in the rod-shaped box 1aa of different sections; each portion of bending 1ab can all become the obtuse angle setting with adjacent bar-shaped box 1aa to each portion of bending 1ab all has interior inclined plane 1ac towards the drilling rod direction and the outer inclined plane 1ad towards chain frame extending direction, and the top of each annular chain 1 is close to the outer inclined plane 1ad of corresponding kink 1ab respectively.

In fig. 2, the chain frame 1a is bent in four sections, wherein the first three sections are bent in the same direction and the fourth section is bent in the opposite direction, so that the driving mechanism 11, i.e., the driving sprocket 1b, can be provided on the rod-shaped boxes of one to four sections, respectively, and the common driven sprocket 1c can be provided on the fourth section, so that no interference is caused when the endless chain 1 is arranged. Of course, the number of stages of the chain frame 1a can be adjusted according to the number of chains so as not to cause interference of the endless chain 1.

In fig. 1 to 3, there are a plurality of driving mechanisms 11, and a plurality of driving sprockets 1b and driven sprockets 1c, which are provided corresponding to the respective endless chains 1. It can be understood that the driving mechanism 11, the driving sprocket 1b or the driven sprocket 1c of each endless chain 1 can also be shared, and at this time, the shared driving sprocket 1b or the shared driven sprocket 1c needs to be coaxially arranged, which can save the equipment cost, but can only realize the same-direction, same-speed and synchronous driving of each chain; in order to be able to achieve torque cancellation or partial cancellation, there should be at least two sets of common drive mechanism 11, drive sprocket 1b or driven sprocket 1 c.

In addition, the chain frames 1a may also be a connecting frame as shown in fig. 17 to 27, one chain frame 1a is used for installing one endless chain 1, and the chain frames 1a corresponding to different endless chains 1 may be connected with each other; when the chain frame 1a in this form is adopted, the driving mechanisms 11 can be arranged above the endless chains 1 and connected with the endless chains 1 one by one through the transmission assemblies; the drive mechanism 11 may also be disposed in the gap between adjacent endless chains 1.

Of course, the chain frame 1a and the endless chain 1 may be replaced by other conventional means besides the present embodiment. In addition, the connection of the endless chain 1 and the drive mechanism 11, the connection of the chain frame 1a and the drill rod, and the arrangement of the drive mechanism 11 may be in other conventional manners than the present embodiment.

Similarly, when the chain frame 1a adopts the connection frame structure of fig. 17 to 27, the driving mechanism 11, the driving sprocket 1b, or the driven sprocket 1c of each endless chain 1 can be shared or separately provided, and the description thereof is omitted.

In this embodiment, the endless chain 1 should have at least one cutting tooth 3 mounted thereon in an array, thereby forming a plurality of cutter units. Thus, when the annular chain 1 rotates, the cutting body units realize cutting, crushing and stirring on the soil body.

During the process that the chain-type carriers circumferentially rotate or reciprocally swing on the drill bit seat (namely, during the excavation process), the excavated object generates reaction torque to act on the chain-type carriers, and the reaction force is transmitted to the drill bit seat through the chain-type carriers. This reaction force, if not balanced by measures, will cause the drill bit holder to move against the direction of movement of the chain carriers. Therefore, in this embodiment, the endless chains 1 preferably have at least two endless chains 1, and the directions of the circumferential rotation of the at least two endless chains 1 on the chain frame 1a are opposite, and the torques generated by the circumferential rotation of the respective endless chains 1 cancel each other or at least partially cancel each other. The distance between two adjacent endless chains 1 can be reduced as much as possible to ensure the excavation efficiency, as long as attention is paid to the fact that the cutting teeth 3 on the two adjacent endless chains 1 do not touch.

When the aforementioned bit seat is used as the chain frame 1a, since the driving mechanisms 11 are located at different height positions of the chain frame 1a, it should be understood by those skilled in the art that the height here refers to the relative position where the center of the driving mechanism 11 is located in the use state of the drill bit, and therefore, the chain segment lengths of different endless chains 1 are different on the same side of the chain frame 1a, and in order to ensure the torque cancellation balance, the installation direction and the installation position of each driving mechanism 11 and the driving sprocket 1b on the chain frame 1a need to be carefully designed according to the length of the endless chain 1. As shown in fig. 1 to fig. 3, four endless chains 1 are disposed on the drill bit of the pile machine, in this embodiment, the longest endless chain 1 and the shortest endless chain 1 are mounted on the same side of the chain frame 1a and have the same circumferential rotation direction on the chain frame 1a, the other two middle and long endless chains 1 are mounted on the other side of the chain frame 1a and have the same circumferential rotation direction on the chain frame 1a, but the circumferential rotation directions of the endless chains 1 on the opposite sides of the chain frame 1a on the chain frame 1a are opposite, so that the torque balance received by the chain frame 1a can be ensured.

The arrangement form of the annular chain 1 on the chain machine frame 1a is various, and the distribution mode of the cutting teeth 3 is determined by the layout of the annular chain 1, so that the excavation mode of the drill bit to the soil body is determined. The arrangement of the endless chain 1 in the chain drill of the pile machine according to the present embodiment will be described in detail.

As shown in fig. 1, 18, 21 and 23, in the present embodiment, the planes of the endless chains 1 are parallel to each other, the projections of the partial chain segments of the endless chains 1 in a plane parallel to the plane of the endless chains 1 are overlapped, and the partial chain segments are vertically arranged, so that the cutting teeth 3 on the partial chain segments form a planar cutter array. Fig. 6 also shows an embodiment in which the partial segments are arranged obliquely.

As shown in fig. 7 to 8, the partial chain segments of the endless chain 1 arranged parallel to each other in the plane may be arranged parallel to or at an angle with respect to the projection of the partial chain segments in a plane parallel to the plane of the endless chain 1.

As shown in fig. 10 and 17, the planes on which the plurality of endless chains 1 are located may be arranged so as to overlap each other. At least two partial chain segments of the endless chain 1 are positioned in the same line or in parallel in the plane of the endless chain 1. It is also possible to arrange at least some chain segments of the two endless chains 1 in an included angle in the plane of the endless chains 1. Preferably, the angle setting can be such that part of the chain segments of each endless chain 1 are distributed in a fan-shaped manner in the plane of the chain bodies 2.

In addition, as shown in fig. 9 and 12 to 16, each endless chain 1 may be arranged such that planes in which at least two endless chains 1 are located intersect with each other. Wherein, part chain segment of at least one annular chain 1 is overlapped with or parallel to the intersection line of the planes of the two annular chains 1; or at least part of chain segments of each annular chain 1 form included angles with the intersection line of the planes of the two annular chains 1. It is also possible to arrange that the planes of the endless chains 1 have a common intersection line, and that at least part of the chain segments of the endless chains 1 are distributed at an angle to the common intersection line. Wherein at least part of the chain segments of each endless chain 1 are distributed in a fan-shaped divergent distribution in a projection in a plane passing through the common intersection line. As shown in fig. 24, 26 and 27, at least two endless chains 1 may be arranged in a plane perpendicular to each other to form a cross-shaped or T-shaped structure. Furthermore, it can be provided that at least a part of the strand sections of the respective endless chains 1 are conically distributed relative to the common intersection line. The cutting teeth 3 in the cutter array with the structure have lower density and upper density, and are convenient to dig and discharge soil. In addition, the intersecting line of the planes of every two endless chains 1 is parallel to a reference straight line, and at least part of chain segments of each endless chain 1 form an included angle with the reference straight line. Preferably, the reference straight line is vertically disposed. Wherein, at least part of the chain segments of the plurality of annular chains 1 are distributed in a fan-shaped divergence way by the projection in a plane passing through the reference straight line; alternatively, at least a portion of the segments of the plurality of endless chains 1 are conically distributed with respect to the reference straight line. The cutting teeth 3 in the cutter array with the structure have lower density and upper density, and are convenient to dig and discharge soil.

For those skilled in the art, as shown in fig. 11, the above arrangement of the endless chains 1 can be combined to form different cutting effects on the soil, so as to meet different requirements.

It is obvious to those skilled in the art that when the endless chain 1 is replaced by a bar chain, the spatial arrangement between the plurality of bar chains may also adopt the above-described structure. Of course, when the chain is replaced by a caterpillar chain and a chain, the caterpillar chain and the chain can adopt the same spatial layout mode. For the endless chain 1, the "plane of the endless chain 1" refers to the plane of the loop formed by the chain; this definition also applies to other endless chain carriers, namely: for the annular chain carriers, the plane where the chain carriers are located refers to the plane where the rings formed by the chain carriers are located; in the case of strip-shaped chain carriers, the "plane in which the chain carriers lie" refers to the plane formed by the chain link arrangement direction.

As shown in fig. 1 and 17, a plurality of cutting teeth 3 are disposed on the endless chain 1, wherein outer ends of the cutting teeth 3 protrude from the endless chain 1 and face the outer side of the endless chain 1, and the cutting teeth 3 are spaced along the endless chain 1 to form a cutter array. It will be appreciated by those skilled in the art that in other embodiments, the inner side of the endless chain 1 may also be provided with cutting teeth 3, but in a position that avoids the corresponding positions of the drive sprocket 1b and the driven sprocket 1c to avoid interference. The cutting teeth 3 are arranged on the inner side of the annular chain 1, so that soil bodies cut by the cutting teeth 3 on the outer side of the annular chain 1 can be further refined.

It should be noted that the cutting tooth 3 of the present embodiment may have different structural forms, and the cutting tooth 3 may be directly mounted on the chain link of the chain, may be directly mounted on the chain link of the endless chain 1 through the link plate, or may be integrally formed with the link plate. The cutting teeth can be made into a multi-tooth saw-shaped structure, and also can be in a cutter shape without teeth or with few teeth (three teeth or less); the pile driver drill bit provided with these two types of cutting teeth is explained in detail below.

Firstly, pile machine drill with cutting teeth of band saw-shaped structure (see figures 17 to 49)

Example 1

As shown in fig. 17, a soil body fully-stirring type chain drill includes a cutting carrier 101 located at the lower portion of a drill rod and capable of rotating end to end along the circumferential direction (obviously, the cutting carrier 101 is a specific form of a chain carrier, when the chain carrier is annular and the working mode is circumferential rotation, the chain carrier is the cutting carrier 101, which will not be described herein below), a protruding structure 2 is located on the surface of the cutting carrier 101, the cutting carrier 101 includes an annular chain 1 connected with a power mechanism, the power mechanism connected with the annular chain 1 is located at the lower portion of the drill rod so as to form a power bottom, and the protruding structure 2 is located on the surface of the annular chain 1. Preferably, when the endless chain 1 is connected to the drill rod 100, the endless chain 1 is arranged longitudinally, that is, the endless chain 1 rotates to the depth of the soil layer to loosen the soil when rotating. The convex structure 2 can be a blade or a cutter tooth, can be integrally formed with the endless chain 1, and can be detachably fixed on the endless chain 1.

It will be understood by those skilled in the art that the cutting carrier 101 is for carrying a protruding structure 2, the protruding structure 2 is for cutting earth, and the cutting carrier 101 may be an endless chain 1 such as a chain, a pulley or the like.

The endless chain 1 may be connected to a drill rod 100, the drill rod 100 being known in the art and may be a telescopic drill rod or an extended length of drill rod or a single rod, etc. After drilling rod 100 connects annular chain 1, because annular chain 1's rotation, protruding structure 2 forms cutting and stirring effect to peripheral earth, fully stirs garrulous earth, if at annular chain 1 to earth cutting and stirring in-process add cement paste or concrete thick liquid, then can be with grout and earth fully mixing even, can make the cement mixing pile of high strength.

The power is arranged downwards, so that the safety hidden danger caused by the fact that the power head is arranged at the top end of the frame is thoroughly solved, particularly the requirements of the torsion of the drill bit on the strength of the frame and the bending strength of the drill rod are met, for example, the pile is 50 meters long and 1 meter in diameter, the height of the pile frame is required to reach the height of a 20-storey building, and if the diameter of the drill rod is enlarged by 2 meters, the pile can only be used for.

The use of powered down can reduce the diameter of the drill rod, which can drill small bore piles. The diameter of a drill rod arranged below the power head is 0.2 m at minimum, and the drill rod can be used for a 2-floor building at minimum, namely the minimum requirement for building and piling is met.

The double-wheel groove milling machine in the prior art can only be used for enclosing row piles with the water content of more than 70 percent, and the depth of the double-wheel groove milling machine can not be more than 30 meters (in a building, if the water content of an engineering pile is high, the quality of the engineering pile is difficult to guarantee, and the double-wheel groove milling machine does not meet the standard requirements of energy conservation and environmental protection)

A large part of the middle of two wheels of the double-wheel mill cannot dig a soil body, 50% of pile ends cannot enter cement concrete, so that the bearing capacity of the pile ends is directly reduced by 50%, and the stability of the pile ends is terrible, so that the double-wheel mill cannot be used for bearing compression-resistant piles and can only be used for enclosure.

The torque can be more effectively transmitted by adopting the power lower-arranged drill bit, and the power loss is reduced.

The power lower part can be matched with the telescopic drill rod, so that the drill rod does not need to be connected, and the drilling efficiency is greatly improved.

The power is put down and is cooperated with chain type cutting, so that soil bodies can be effectively cut up, cement and the soil bodies can be more fully mixed into a whole, and the performance of the stirring pile is improved.

The chain type stirring can reduce the effective area of the drill bit entering the soil body, reduce the replacement rate of the original soil body and effectively reduce the pollution caused by slurry replacement.

The motor which can enter water and has good sealing performance is adopted in the improvement of repeated tests to achieve the purpose, and a hydraulic motor such as a motor for a double-wheel milling machine is preferably selected, but the motor directly drives a cutter to work, and after the cutter enters the soil body, the sealing part in the cutter is easy to wear, the maintenance cost is high, the time is long, and the use price is high. The invention relates to a method for stirring soil bodies uniformly, which aims to solve the problems that a motor works for a long time, the motor is not easy to abrade and the soil bodies are stirred uniformly.

The endless chain 1 is connected with a driving mechanism 11, and the driving mechanism 11 is located at the lower part of the drill rod 100, and the driving mechanism 11 can drive the endless chain 1 to rotate circumferentially. The drive mechanism 11 may be an electric motor or a hydraulic motor.

For the connection of the drill rod 100 to the endless chain 1, a connection socket, a flange, a connection frame, or the like may be used. In the present embodiment, as shown in fig. 17, the drill rod 100 is connected to the driving mechanism 11 through a flange, and the driving mechanism 11 is connected to the endless chain 1 through the transmission assembly 11a, so that the connection between the drill rod 100 and the endless chain 1 is realized. The drive mechanism 11 may be an electric or hydraulic motor and the transmission assembly 11a may be a gear transmission or a pulley transmission.

The endless chain 1 is provided with a chain rack 1a, the chain rack 1a is provided with a driving chain wheel 1b and a driven chain wheel 1c, and the driving chain wheel 1b is connected with a driving mechanism 11. The chain frame 1a, the driving sprocket 1b and the driven sprocket 1c are auxiliary structures required for the rotation of the chain, and are not described herein for the prior art.

It should be understood by those skilled in the art that the protruding structure 2 on the surface of the endless chain 1 may be recessed in the endless chain 1 or may protrude from the endless chain 1, and the protruding structure 2 may be fixedly connected with the endless chain 1 or detachably connected with the endless chain 1.

In the present embodiment, the protruding structure 2 preferably includes cutting teeth 3 fixed on the endless chain 1, and the cutting teeth 3 protrude from the surface of the endless chain 1. The cutting teeth 3 are arranged on the endless chain 1 at equal intervals, and the width of the cutting teeth 3 can be larger than that of the endless chain 1, smaller than that of the endless chain 1, or equal to that of the endless chain 1. Of course, it is preferable that both ends of the cutting teeth 3 extend 2 to 5cm beyond the side of the endless chain 1.

The convex structure 2 may also be designed to form an uneven concave-convex shape on the outer surface of the endless chain 1, that is, the heights of the chain links constituting the chain are different, so that the concave-convex shape is naturally formed on the outer surface of the endless chain 1.

An annular chain 1 can form cutting and stirring when rotating, but glues earth easily between the cutting tooth 3, leads to cutting capacity to descend, as preferred scheme, in this embodiment, annular chain 1 has two and two planes that annular chain 1 located are located the coplanar, two annular chain 1 form a chain cutting assembly 6, cutting tooth 3 on two annular chain 1 are crisscross each other, when two annular chain 1 rotate, cutting tooth 3 on one of them annular chain 1 inserts in the middle of two cutting teeth 3 of another annular chain 1, strikes off or shifts out the earth in the middle of cutting tooth 3, keeps not filled up by earth in the middle of two cutting teeth 3 all the time to guarantee the cutting effect of cutting tooth to earth.

Obviously, since the cutting teeth 3 of the two endless chains 1 in one chain cutting assembly 6 are staggered, the staggered cutting teeth 3 must travel in the same direction, which requires the circumferential directions of rotation of the two endless chains 1 to be opposite; the two endless chains 1 should therefore be driven by respective drive means 11 via separate transmission assemblies 11a, i.e. the drive means 11 is not common to both endless chains 1 belonging to the same chain cutting assembly 6.

The chain type cutting assembly 6 can form a plane cutting effect, and the cutting range is large. More preferred scheme, chain cutting assembly 6 has two sets ofly and two sets of chain cutting assembly 6 are parallel to each other, and two sets of chain cutting assembly 6 form the solid cutting effect, and cutting and stirring speed obviously improve. Although the present embodiment shows a solution with two sets of chain cutting assemblies 6, it does not mean that only two sets of chain cutting assemblies 6 can be used, and it is obvious that a person skilled in the art can design a solution with three, four or more sets of chain cutting assemblies 6 combined under the teaching of this solution.

A material conveying pipe component 5 capable of conveying slurry and/or compressed air is arranged in a gap between the two groups of chain type cutting components 6. The material conveying pipe assembly 5 comprises a pulp conveying pipe 7 and a gas conveying pipe 8, and pipe openings of the pulp conveying pipe 7 and the gas conveying pipe 8 extend to the middle part of the annular chain 1. In this embodiment, the pipe orifice of defeated thick liquid pipe 7 and gas-supply pipe 8 extends to the middle part of annular chain 1 and indicates, and defeated thick liquid pipe 7 and the pipe orifice of gas-supply pipe 8 do not extend annular chain 1 outside, and in the cutting process of annular chain 1, and defeated thick liquid pipe 7 inputs grout or concrete material, and gas-supply pipe 8 inputs compressed air, and the speed and the efficiency of preparation cement mixing pile can be improved by a wide margin to the realization is gone on when cutting, stirring.

As shown in fig. 18 and 19, the chain type cutting assemblies 6 are provided in two groups, and the auxiliary cutting assembly 4 capable of rotating along the circumferential direction is arranged between the two groups of chain type cutting assemblies 6 and close to the end parts of the chain type cutting assemblies 6. When chain cutting assembly 6 had two sets of times, there was the space in the middle of, space department gets into earth easily, especially after the tip of chain cutting assembly 6 was adhered by earth, the power that the rotation required can improve by a wide margin, and 6 clearance departments of two sets of assistance chain cutting assembly can't form the cutting to earth in addition, at this moment, supplementary cutting assembly 4 rotates, forms the cutting and eliminates the earth adhesion between chain cutting assembly 6 to the earth of clearance department.

The auxiliary cutting assembly 4 may be a sprocket located between two sets of chain cutting assemblies 6, the sprocket is connected to the driving sprocket 1b or the driven sprocket 1c on the chain cutting assemblies 6, and rotates synchronously with the driving sprocket 1b or the driven sprocket 1c, in this embodiment, referring to fig. 19, the auxiliary cutting assembly 4 includes an auxiliary chain 9 and auxiliary teeth 10 fixed on the auxiliary chain 9, and the auxiliary teeth 10 protrude out of the surface of the auxiliary chain 9.

The auxiliary chain 9 is also provided with a chain frame 1a, a driving sprocket 1b, and a driven sprocket 1 c. When the drill rod 100 is connected to the chain cage 1a, the connection to the endless chain 1 is achieved, but of course, the chain cages 1a of different endless chains 1 may be connected to each other.

Obviously, as shown in fig. 17, the two sprockets of the auxiliary cutting assembly 4 are respectively connected with the driven sprockets 1c of the two endless chains 1 through transmission shafts, but since the directions of rotation of the driven sprockets 1c on the two endless chains 1 are opposite, it is impossible for the two sprockets of the auxiliary cutting assembly 4 to both rotate synchronously with the respectively connected driven sprockets 1 c. One of the chain wheels rotates synchronously with a driven chain wheel 1c of the annular chain 1, and the chain wheel is fixedly connected with a corresponding transmission shaft, so that the chain wheel and the corresponding transmission shaft cannot rotate in the circumferential direction; and the other sprocket is in sliding fit with the corresponding transmission shaft, so that the driven sprocket 1c does not drive the sprocket to rotate, and the sprocket only rotates synchronously with the other sprocket on the auxiliary cutting assembly 4 (i.e., the sprocket driven by the driven sprocket 1c of the endless chain 1).

Example 2

The structure and the working principle of the present embodiment are substantially the same as those of embodiment 1, except that, as shown in fig. 20 and 21, there are two endless chains 1 which are parallel to each other, the two endless chains 1 are not on the same plane, that is, there is a gap between the two endless chains 1, and an auxiliary cutting assembly 4 which can rotate along the circumferential direction is disposed at the end of the two endless chains 1. Obviously, under the teaching of this solution, the skilled person can design a solution in which three, four or more sets of endless chains 1 are combined. The auxiliary cutting assembly 4 of this embodiment is substantially the same as that of embodiment 1, and the auxiliary chain 9 is transversely arranged and matched with the width of the endless chain 1.

In this embodiment, the endless chain 1 is rectangular, and one sprocket is provided at each corner, one or two of which are the driving sprockets 1b, and the other is the driven sprocket 1c, and when there are two driving sprockets 1b, a differential should be used.

It should be understood by those skilled in the art that when the driving mechanism 11 is connected to the driving sprocket 1b, a conveying pipe assembly 5 capable of conveying slurry and/or compressed air is disposed between the two endless chains 1 of the present embodiment through a conventional transmission structure such as a gear, a sprocket, or a pulley, as shown in fig. 21. In this embodiment, the material conveying pipe assembly 5 comprises a pulp conveying pipe 7 and a gas conveying pipe 8, the pulp conveying pipe 7 and the gas conveying pipe 8 are located in a gap between the two annular chains 1, wherein the pulp conveying pipe 7 is divided into a plurality of branched pipe openings which extend to the bottom and the side wall of the annular chains 1.

In this embodiment, a protective cover 11b is sleeved outside the driving mechanism 11 to protect the driving mechanism 11. In this embodiment, the width of the endless chain 1 can be widened.

Example 3

The structure and operation of this embodiment are substantially the same as those of embodiment 2, except that, as shown in fig. 22 and 23, the driving mechanism 11 in this embodiment is disposed in the gap between the two endless chains 1, and the output end of the driving mechanism 11 is directly connected to the driving sprocket 1b on the endless link. Drill pipe 100 is directly connected to drive mechanism 11.

Example 4

The structure and operation of this embodiment are substantially the same as those of embodiment 1, except that, as shown in fig. 24 and 25, at least two endless chains 1 are provided, and the axial lines of at least two endless chains 1 are perpendicular to each other.

Specifically, in this embodiment, two of the endless chains 1 are parallel to each other to form one chain type cutting assembly 6, the other two endless chains 1 are parallel to each other to form the other chain type cutting assembly 6, and the two chain type cutting assemblies 6 are perpendicular to each other to form a T-shaped structure.

The endless chain 1 of this embodiment has the same structure as that of embodiment 1, and a feed conveyor assembly 5 may be provided in the chain cutter assembly 6.

This embodiment is the structure of T type, can directly be used for making T type stirring stake, thereby and need not many drill bit interconnect and form T type structure, when making T shape stake with the drill bit of this embodiment, effectual, and stirring effect further improves.

Example 5

The present embodiment has substantially the same structure and operation as those of embodiment 4, except that, as shown in fig. 26, the present embodiment has two endless chains 1, wherein one endless chain 1 has the same structure as that of embodiment 1, the other endless chain 1 has the same structure as that of embodiment 2, and the two endless chains 1 are perpendicular to each other to form a cross-shaped structure.

Example 6

The structure and the working process of the present embodiment are basically the same as those of embodiment 4, except that, as shown in fig. 27, the present embodiment has two endless chains 1, the structure of the two endless chains 1 is the same as that of embodiment 1, and the two endless chains 1 are perpendicular to each other to form a cross-shaped structure.

Example 7

As shown in fig. 28 to 30, the cutting carriers 101 have a plurality of strips, and the ends of the projections of every two adjacent cutting carriers in the vertical direction coincide, and the center lines of the ends of the projections of every two adjacent cutting carriers in the vertical direction can be connected into a triangle.

Every two adjacent cutting carriers 101 form a triangular cutting and stirring effect, and the cutting effect, namely the stirring effect is obviously superior to the combination mode of other cutting carriers.

The dicing carrier 101 and the rest of the structure in this embodiment are the same as those in the above-described embodiment.

Example 8

This embodiment is substantially the same as the embodiment except for the structure of the endless chain 1 and the cutting teeth 3. Referring to fig. 31, the heights of the cutting teeth on the endless chain 1 are different, the cutting teeth 3 themselves form a saw-shaped structure, and the surfaces of the cutting teeth 3 are provided with cutting small teeth (not shown). In the present embodiment, the protruding structure 2 comprises cutting teeth 3 fixed on the endless chain 1 and the cutting teeth 3 protrude from the surface of the endless chain 1. The cutting teeth 3 are arranged on the endless chain 1 at equal intervals and are provided with small cutting teeth similar to saw blades.

Referring to fig. 45 and 46, the plane of the partial cutting teeth 3 on the endless chain 1 is at an angle to the plane of the endless chain 1.

At least two endless chains 1 are provided, and as shown in fig. 47 and 48, at least one of the cutting teeth of the endless chain 1 forms different angles with the endless chain 1 so that the cutting teeth of the endless chain 1 form a fan-shaped cutting surface when the endless chain 1 rotates in the circumferential direction.

As shown in fig. 45 and 46, the cutting teeth of the endless chain 1 are inclined in different directions so that the vertical projections of the cutting teeth of the endless chain 1 form a sector.

A material conveying pipe assembly 5 capable of conveying slurry and/or compressed air is arranged in a gap between two adjacent annular chains 1.

Example 9

The rest of this embodiment is the same as the above embodiment, except that, in combination with fig. 33-44, there are several cutting carriers 101, and the vertical projection of the cutting carriers has one or more rows, each row having one or more cutting carriers 101.

Example 10

As shown in fig. 32, in the present embodiment, the protruding structure 2 includes cutting teeth 3 fixed on the endless chain 1 and the cutting teeth 3 protrude from the surface of the endless chain 1. The cutting teeth 3 are arranged on the endless chains 1 at equal intervals, the cutting teeth 3 are sequentially inclined towards the other endless chain 1 on the surface of one endless chain 1, as shown in fig. 47-48, the cutting teeth 3 on two adjacent endless chains 1 are staggered with each other, preferably inclined at equal angles to 45 degrees, and the distribution of the cutting teeth 3 with equal-angle inclination can be repeatedly distributed on one endless chain 1. By means of the arrangement of the cutting teeth 3, the soil body fully-stirring type chain type drill bit in the embodiment can cut soil, rock and further expand application occasions of the drill bit. The cutting teeth 3 may also be formed directly on the surface of the endless chain 1.

Example 11

The present embodiment is substantially the same as the other embodiments except that, as shown in fig. 49, the protrusion structure 2 of the surface of the endless chain 1 includes a link plate 1d fixed to the endless chain 1, and a cutting tooth 3 fixed to the link plate 1 d.

Embodiment 1 ~ 11 the advantage of chain drill bit that shows lies in, the annular chain can directly form with the drilling rod and be connected, be convenient for change, the rotation direction of annular chain is the rotation of vertical direction, cooperation protruding structure or cutting tooth form the effect of a vertical cutting later on, also be the rotation direction of annular chain and the axial direction parallel of the pile body that needs the preparation, the system stake speed obtains obviously improving, in the cutting process of cutting tooth to earth, earth is stirred along the circumference of annular chain, also accomplish down to the top, from the top down circulation stirring again, the stirring is very even, be favorable to making the cement soil mixing pile of high strength misce bene.

In contrast, the prior art has significant disadvantages. The traditional cement-soil mixing pile is characterized in that a drilling machine special for a deep mixing pile is utilized, cement is injected into a foundation to be deeply used as a curing agent, soft soil and the curing agent are mixed forcibly on site, and the curing agent and the soft soil are subjected to a series of physical and chemical reactions to be condensed into a cement reinforcing body with integrity, good water stability and high strength, so that the cement reinforcing body and a natural foundation form a high-quality composite foundation with a certain bearing capacity. Its advantages are high pile-forming speed, high efficiency, low cost, no vibration, noise and pollution. The construction method is divided into two construction types of a slurry stirring method wet method and a powder stirring method dry method according to the state of using the reinforcing material, wherein the wet method mainly uses cement paste, is uniformly stirred relative to the dry method and is easy to repeat. In this kind of stake mode of making, the intensity of soil cement mixing pile mainly relies on the combination degree decision of thick liquids and earth around, if thick liquids and earth mix inhomogeneous, the intensity of soil cement mixing pile can receive very big influence, also intensity can reduce promptly. The pile body uniformity is a key index of the pile forming quality of the cement soil mixing pile, but the problem of uniform mixing and stirring still exists in wet construction. Therefore, how to achieve the effect of uniformly mixing the slurry and the soil in the drilling process becomes the key of the current research.

The movable drill rod [201510417309.5] of the cement soil mixing pile driver applied by the applicant comprises a driving box body with an inner cavity, wherein at least one through hole axially penetrating through the whole driving box body is formed in the driving box body, a cylindrical guide sleeve capable of rotating in the circumferential direction is arranged in the through hole, a drill rod penetrating through the whole driving box body is arranged in the guide sleeve in a penetrating mode, an axial guide structure is arranged between the drill rod and the guide sleeve, the guide sleeve is connected with a circumferential rotating mechanism capable of driving the guide sleeve to rotate in the circumferential direction, and the drill rod is connected with an axial driving mechanism 11 capable of driving the drill rod to slide in the axial reciprocating mode. The drill rod body of this scheme can axially stretch out and draw back and can carry out endwise slip in circumferential direction, is difficult for meetting the phenomenon that can't bore, has increased the girth of the cement mixing pile cross section after the construction, has improved the resistance to plucking ability of cement mixing pile. But the proposal does not make creative improvement on the structure of the drill bit, and the stirring uniformity of the drill bit on soil needs to be further improved. The chain type drill bit of the invention greatly improves the stirring uniformity and solves the problems in the prior art.

Pile machine drill with blade-shaped cutting teeth (see figures 1-5 and 50-55)

Example 12

As shown in fig. 4 and 5 and seen in fig. 1 to 3, at least one row of cutting teeth 3 is arranged on the endless chain 1 and distributed along the length direction of the endless chain 1, and a soil discharge gap is left between the adjacent rows of cutting teeth 3. The number of rows of cutting teeth 3 may be determined as desired. The cutting tooth 3 comprises a connecting portion 34 and a working portion 35 provided on the connecting portion 34. In this embodiment, the working portion 35 and the connecting portion 35 are integrally connected, and the connecting portion 35 has a mounting hole 33, and the cutting teeth 3 are fixedly mounted on the endless chain 1 through the mounting hole 33; the cutting teeth 3 may also be disposed on any one or more of the inner link plate 201, the outer link plate 202, the link pin 203, and other components of the endless chain 1. The cutting teeth 3 of adjacent rows should not be too close to avoid affecting the soil discharge. But should not be too sparse to affect excavation efficiency or affect lateral dimensions. When mounted on the endless chain 1, the working portion 35 protrudes from the endless chain 1 and faces the outside of the endless chain 1.

As shown in fig. 5 and seen in fig. 1 and 2, each cutting tooth 3 in adjacent rows of cutting teeth 3 is also arranged in an opposite manner, or may be arranged in a staggered manner; moreover, the bending and/or twisting of the outer ends of the cutting teeth 3 in adjacent rows of cutting teeth 3 can be in the same direction or in different directions, and the bending and/or twisting can be specifically arranged according to specific soil discharging requirements.

As shown in fig. 5, in combination with fig. 50-54, the cutting tooth 3 is made of sheet material in this embodiment, but the equivalent cutting width of the cutting tooth 3 is greater than the thickness of the cutting tooth 3. The equivalent cutting width is the sum of the actual excavation widths of the excavated portions of the cutting teeth 3 during cutting. If the excavated part formed by the cutting teeth 3 is continuous, the equivalent cutting width is the width of the excavated part; if the excavated part formed by the cutting teeth 3 is discontinuous, the equivalent cutting width is the sum of the widths of all parts of the excavated part.

The way to achieve that the equivalent cutting width of the cutting tooth 3 is larger than the thickness of the cutting tooth 3 is: (1) the cutting teeth 3 are arranged obliquely to the running direction of the cutting teeth 3; (2) the extending direction of the working part 35 is parallel to the running direction of the cutting teeth 3 or arranged in an acute angle, and the working part 35 is bent and/or extended in a twisting mode relative to the running direction of the cutting teeth 3.

The mode (2) is more preferable, because bending and/or twisting can not only effectively improve the excavation size of a single cutter, but also can form a soil discharging surface 36 on the working part 35, which is beneficial to soil discharging and facilitates soil body thinning, and the combination of the two can further improve the excavation efficiency; in addition, it is advantageous for the following mixing operation of the excavated soil mass, as can be seen from fig. 55, the angle of the bending and/or torsional extension of the working part 35 is acute with respect to the direction of travel of the cutting teeth 3, and this acute angle (α) may be 30 ° to 60 °. Under this angle of buckling and/or twisting, not only the structure of cutting tooth 3 is comparatively firm, and the atress is reasonable, and the soil discharging is efficient.

As shown in fig. 50 and 51, the outer end of the cutting tooth 3 can be flat-headed or pointed; as shown in fig. 52, 53 and 54, the working portion 35 may be further provided with at least one notch 32, so that the outer end of the cutting tooth 3 is divided into at least two cutting portions 31, and at least two cutting portions 31 are not in the same plane. The individual cutting portions 31 are bent laterally and/or extended in a twisted manner relative to the direction of travel of the cutting tooth 3. At least two cutting portions 31 have different directions of extension or different angles of extension. The number of slits 32 can be specifically designed according to specific needs. After setting up incision 32, the ground that is excavated can be followed incision 32 and dispersed, has not only expanded the cutting size of cutting tooth 3, is favorable to further refining the ground, and the efficiency of dumping is also further improved moreover.

In the application, the cutting teeth 3 can be split cutters fixedly arranged on the annular chain 1; or may be an integral cutter integrally formed with the members constituting the endless chain 1. As shown in fig. 50 to 54, in the case of a separate cutter, the cutting teeth 3 may be provided with mounting holes 33 for mounting the cutting teeth 3 to the endless chain 1.

As shown in fig. 2, in the present embodiment, a conveyor assembly is further provided on the chain frame 1 a. The material conveying pipe component is arranged between two adjacent annular chains 1. Therefore, in the process of cutting rock soil by the annular chain 1, the material conveying pipe assembly can spray slurry or jet air into the rock soil, so that excavation and stirring are realized.

The composition and arrangement of the feed conveyor assembly in this embodiment are the same as in embodiments 1-11.

The advantage of the pile driver drill bit shown in embodiment 12 is that: (1) the cutting teeth are reasonably distributed, so that the refinement of rock soil is facilitated, the structural strength of the cement mixing pile is improved, the floating pile is avoided, and the extrusion to the peripheral rock soil is obviously reduced; (2) the outer ends of the cutting teeth are bent or twisted, so that the equivalent cutting width of the cutting teeth is larger than the thickness of the cutting teeth, the excavation size of a single cutting tooth can be effectively improved, soil discharging is facilitated, and soil thinning is facilitated; in addition, the method is beneficial to carrying out subsequent stirring operation on the excavated soil body; (3) the working part of the cutting teeth is provided with at least one notch, so that the working part is at least two cutting parts, and the excavated rock soil can be scattered from the notch, thereby not only expanding the cutting size of the cutting teeth and being beneficial to further refining the rock soil, but also further improving the soil discharging efficiency; (4) the cutting teeth are provided with the soil discharging surface on the working part, so that the rock soil cut by the working part can be thrown to the lateral rear side of the working part along the soil discharging surface, the rock soil after being cut is prevented from influencing the cutting process due to accumulation at the cutting teeth body, causing power loss and hardening the soil into blocks again, soil body refinement is facilitated, the rock soil crushing efficiency is improved, and the excavated soil body is convenient for subsequent stirring operation; (5) the cutting teeth are flat and long and are made of sheet materials, so that the outer ends of the cutting teeth can be cut into soil layers more quickly and smoothly, and the rock soil crushing effect is good.

Example 13

A pile machine comprising a drill rod to which a power unit 205 for pushing down is connected, the lower end of the drill rod being provided with a plurality of chain drills of the pile machine as in embodiment 12. Preferably, there are a plurality of chain frames 1a, and each chain frame 1a is sequentially provided at intervals in the drill rod extending direction. The connection mode between each chain frame 1a may be welding, clamping, buckling, etc. which can realize firm connection.

Example 14

A pile machine comprises a drill rod 100 connected with a downward pressing power device 205, wherein the lower end of the drill rod 100 is provided with a soil body fully-stirring type chain type drill bit as in embodiments 1-11.

In the embodiments 13 and 14, the drill bit is arranged at the lower end of the drill rod 100 connected with the downward pressing power device 205, when excavation is carried out, the downward pressing power device 205 can obviously improve the excavation capacity of the cutter, and excavation similar to milling, coring and cutting is carried out.

In the above-described pile driver drill bit construction with two types of cutting teeth, there are additional differences in addition to the cutting teeth 3. It will be appreciated that these differences may be interchanged as desired. For example, the "bit-holder" type chain stand employed in FIGS. 1-3 may also be incorporated in FIGS. 17-24; for another example, the auxiliary cutting assembly used in FIGS. 17-24 can also be mounted to the bottom end of the chain carrier of FIGS. 1-3, if desired. Such alternatives, however, are not described in detail herein.

The power down mode is preferably used in the above embodiment, although this is not required. It should be noted that when the power down mode is adopted, the driving mechanism 11, such as a motor, is installed in the drill bit seat, and in order to prevent the entry of foreign matters such as water, mud and the like, the power down part should adopt a reliable sealing mechanism, which is exemplified as follows.

As shown in fig. 56, the power unit sealing structure of the present embodiment is disposed between the drive mechanism 11 (such as a hydraulic motor, an electric motor, etc.) and the drive sprocket 1 b.

As shown in fig. 56 and fig. 59, a driving sprocket 1b is fixedly mounted on the output main shaft 11c of the driving mechanism 11, wherein a shaft sleeve 1ba of the driving sprocket 1b is sleeved on the outer peripheral surface of the output main shaft 11 c; the output main shaft 11c is fixedly installed and hermetically matched with a flange plate 11e, an annular step 1bb is arranged on the inner periphery of the shaft sleeve 1ba at the end part facing one end of the driving mechanism body 11d, and the annular step 1bb abuts against the flange plate 11 e; a plurality of first mounting holes 1bc penetrating through the shaft sleeve 1ba are formed in the shaft sleeve 1ba, the first mounting holes 1bc are strip-shaped and extend along the axial direction of the shaft sleeve 1ba, second mounting holes corresponding to the positions and the apertures of the first mounting holes 1bc one by one are formed in the flange plate 11e, and inner hexagonal cylindrical head screws 1e are mounted in the matched first mounting holes 1bc and the second mounting holes; thereby fixedly mounting the driving sprocket 1b to the output spindle 11c of the driving mechanism 11.

In order to facilitate mounting and dismounting, in the present embodiment, the socket cap screw 1e is mounted on the shaft sleeve 1ba from an end portion of the shaft sleeve 1ba that is away from the end of the driving mechanism body 11d, and a spring washer 1f is disposed between the socket cap screw 1e and an end surface of the shaft sleeve 1 ba. In addition, a sealing gasket can be additionally arranged at the position; therefore, the sealing effect is better through the threaded connection sealing and the sealing gasket sealing.

Of course, other conventional screw forms can be selected besides the socket head cap head screw 1 e; instead of the spring washer 1f, other conventional elastic washers may be used.

The sealing gasket or oil seal can be adopted between the flange 11e and the output main shaft 11c to realize static sealing.

As shown in fig. 56, the sealing mechanism of the present embodiment includes a sealing cap 300, and the sealing cap 300 includes a first end 302 and a second end 303 that are integrally provided. The sealing cap 300 may be cylindrical as shown in fig. 56, with the second end of the cylinder open and the first end being a bottom with a central hole. Of course, the sealing cap 300 may also be a hemispherical cap or the like, as long as it is convenient to achieve sealing.

As shown in fig. 56 and 60, a first end 302 of the sealing cover 300 is fixedly mounted on the driving mechanism body 11d, the first end 302 has a first annular end face 304 closely attached to the outer peripheral surface of the cover 11f of the driving mechanism body 11d and a second annular end face 305 closely attached to the outer peripheral surface of the body 11g of the driving mechanism body 11d, a connecting face 306 of the first annular end face 304 and the second annular end face 305 is attached to the outer end face of the cover 11f, a plurality of third mounting holes 307 are formed in the first end 302 at positions where the connecting face 306 is located, a plurality of fourth mounting holes 11h corresponding to the positions of the third mounting holes 307 one by one are formed in the cover 11f, and a fastening bolt may be disposed between the third mounting holes 307 and the fourth mounting holes 11 h; sealing gaskets may also be provided between the first annular end face 304 and the outer peripheral surface of the cover 11f, between the second annular end face 305 and the outer peripheral surface of the body 11g, and between the connecting face 306 and the outer end face of the cover 11f to form static seals. In this embodiment, the diameter of the third mounting hole 307 is larger than the diameter of the fourth mounting hole 11h, so that the nut of the fastening bolt can abut against the outer edge of the opening of the fourth mounting hole 11 h.

As shown in fig. 57, the second end 303 of the sealing cover 300 is sleeved on the shaft sleeve 1 ba; a guide surface 1bd is provided on the outer periphery of the sleeve 1ba at an end portion of the sleeve 1ba facing one end of the drive mechanism body 11d, and the guide surface 1bd can guide the seal cover 300 when the seal cover 300 is attached to the sleeve 1 ba. Of course, the guide surface 1bd may be a flat surface or an arc surface.

As shown in fig. 57 and 58, a dynamic seal element is disposed between the second end 303 of the seal cover 300 and the shaft sleeve 1ba, an inner stop ring 301 for axially limiting the dynamic seal element is disposed in the seal cover 300, and a seal cover end cap 400 serving as an outer stop ring is fixedly mounted on an end portion of the seal cover 300. In this embodiment, the end cap 400 of the sealing cap includes a cap body 401 fastened to the end face of the sealing cap 300 by a fastening bolt 403, the cap body 401 has an extension 402 located between the sealing cap 300 and the shaft sleeve 1ba and respectively engaged with the sealing cap 300 and the shaft sleeve 1ba in a sealing manner, and the extension 402 is disposed opposite to the inner stop ring 301 to form an annular accommodating space for accommodating the dynamic sealing element. It will be appreciated that the seal housing end cap 400 and the seal housing 300 may be directly threaded (i.e., extension 402 may have external threads and the seal housing may have internal threads that mate with the external threads) such that the seal housing end cap 400 may be rotated to secure the two together.

In this embodiment, the dynamic sealing element includes a sealing ring 500, the sealing ring 500 is positioned inside the sealing cover 300, and the sealing ring 500 is simultaneously tightly attached to the inner circumferential surface of the sealing cover 300 and the outer circumferential surface of the shaft sleeve 1 ba. The sealing ring 500 is sleeved on the shaft sleeve 1ba in a sliding mode, a plurality of annular grooves 502 are formed in an annular sealing surface 503 on the inner periphery of the sealing ring 500, and the annular grooves 502 are distributed at intervals along the axial direction of the shaft sleeve 1 ba; the end of the outer periphery of the sealing ring 500 is provided with an annular gap 501, and an elastic ring 600 in a pressed state is embedded in the annular gap 501. When the sealing ring is not pressed, the size of the elastic ring 600 in the radial direction of the sealing ring 500 is larger than that of the annular notch 501 in the radial direction of the sealing ring 500, so that the elastic ring 600 can protrude out of the annular notch 501 towards the sealing cover 300, so that the sealing cover 300 presses the elastic ring 600; the elastic ring 600 in a compressed state can be closely attached to the seal ring 500 and the seal cap 300, respectively.

In this embodiment, the cross section of the annular groove 502 may be rectangular, arc-shaped or wedge-shaped, which is not limited in this application. However, the cross section of the annular groove 502 on the side close to the driving mechanism body 11d is preferably wedge-shaped, and the depth of the wedge shape gradually increases from the side close to the driving mechanism body 11 to the side away from the driving mechanism body 11 d. This is because the annular groove 502 having a wedge-shaped cross section can not only be deformed rapidly, but also the wedge-shaped surface can be brought into sealing contact with the outer peripheral surface of the shaft sleeve 1ba as quickly as possible and to the maximum extent; the wedge-shaped depth is smaller on one side close to the driving mechanism body 11d, so that sealing is easier to realize between the outer peripheral surface of the shaft sleeve 1ba and the sealing ring 500 on one side close to the driving mechanism body 11d, and the connection part between the driving chain wheel 1b and the output main shaft 11c of the driving mechanism 11 and the connection part between the output main shaft 11c and the driving mechanism body 11d are guaranteed to be protected in a sealing mode preferentially.

In this embodiment, there are at least two dynamic sealing elements, and an isolating ring 700 fitted around the shaft sleeve 1ba is provided between adjacent dynamic sealing elements. The seal ring 500 and the isolation ring 700 are made of hard nonmetal wear-resistant materials, wherein the polymer wear-resistant material can be ceramic composite material, silicon carbide (SiC), silicon nitride (Si)₃N₄) Toughened zirconia (Y)₂O₃+ZrO₂) Toughening aluminium oxide (Al)₂O₃/ZrO₂) And so on.

The working principle of the sealing structure of the power device of the embodiment is as follows:

after the assembly is completed, the inner stop ring 301 and the end cover 400 of the sealing cover have the function of positioning dynamic sealing elements such as the sealing ring 500, wherein the sealing ring 500 is tightly attached to the inner side wall of the sealing cover 300 and the outer peripheral surface of the shaft sleeve 1ba, the elastic ring 600 is extruded to generate elastic deformation, and the elastic deformation is tightly expanded between the annular notch of the sealing ring 500 and the sealing cover 300, so that the sealing ring 500 is further deformed, self-tightening is realized, and a better sealing effect is achieved. Wherein the annular groove 502 facilitates deformation of the seal ring 500 to enhance sealing. In case there is the foreign matter to get into the clearance of sealed cowling end cover 400 and sealed cowling 300, elastic ring 600 is further pressurized for sealing washer 500 follows deformation, makes sealing washer 500 and axle sleeve 1ba and sealed cowling 300 laminating more inseparabler, thereby improves sealed effect effectively.

Claims

1. A pile machine chain type drill bit arranged under power comprises a chain rack (1a) and is characterized in that at least two chain type carriers are arranged on the chain rack (1a), the running directions of the at least two chain type carriers are opposite, torque generated by rotation or reciprocating swing of each chain type carrier is mutually offset or at least partially offset, a plurality of cutting teeth (3) are arranged on the chain type carriers, the outer ends of the cutting teeth (3) protrude out of the chain type carriers and face the outer sides of the chain type carriers, and a chain transmission mechanism (204) is arranged between the chain type carriers and the chain rack (1a) to drive the chain type carriers to circumferentially rotate or reciprocate swing on the chain rack (1 a); the chain rack (1a) is positioned at the lower part of the drill rod (100), a power device (205) is arranged on the chain rack (1a), and the power device (205) is connected with the chain transmission mechanism (204); the chain transmission mechanism (204) comprises an upper chain wheel and a lower chain wheel which are arranged on the chain rack (1a), and the upper chain wheel and/or the lower chain wheel are/is connected with the power device (205); a sealing structure is arranged between the upper chain wheel and/or the lower chain wheel and the power device (205), and the upper chain wheel and/or the lower chain wheel connected with the power device (205) is used as a driving chain wheel (1 b); the sealing structure comprises a sealing cover (300) arranged between a power device body (11d) and a driving sprocket (1b), a first end of the sealing cover (300) is fixedly arranged on the power device body (11d), a second end of the sealing cover (300) is sleeved on a power wheel shaft sleeve (1ba), a static sealing element is arranged between the first end of the sealing cover (300) and the power device body (11d), and a dynamic sealing element is arranged between the second end of the sealing cover (300) and the power wheel shaft sleeve (1 ba);

the power device (205) is directly arranged in a box body of the chain rack (1a), the power device (205) comprises a plurality of driving mechanisms (11), the driving mechanisms (11) are correspondingly arranged and connected with the driving chain wheels (1b) of the annular chains (1) one by one, and the running direction and the running speed of each annular chain (1) can be controlled independently; a driving chain wheel (1b) is fixedly arranged on an output main shaft (11c) of the driving mechanism (11), wherein a power wheel shaft sleeve (1ba) of the driving chain wheel (1b) is sleeved on the peripheral surface of the output main shaft (11 c);

the dynamic sealing element comprises a sealing ring (500), the sealing ring (500) is positioned on the inner side of the sealing cover (300), and the sealing ring (500) is tightly attached to the inner circumferential surface of the sealing cover (300) and the outer circumferential surface of the power wheel shaft sleeve (1 ba).

2. The power-down pile driver chain drill bit as claimed in claim 1, wherein the chain carrier is ring-shaped, and the chain carrier is wound on the upper chain wheel and the lower chain wheel.

3. The power-down pile driver chain drill bit as claimed in claim 1, wherein the chain carrier is ring-shaped, and the chain carrier is wound on the upper chain wheel and the lower chain wheel; each lower chain wheel is arranged on the chain frame (1a) in equal height.

4. A power down-set piling chain drill according to claim 1, wherein said drive sprocket (1b) is fixedly mounted to an output spindle (11c) of said power unit (205).

5. The power-down pile driver chain drill bit as recited in claim 1, wherein said sealing ring (500) is slidably fitted on the power hub (1ba), and a plurality of annular grooves (502) are formed on an annular sealing surface (503) of an inner periphery of said sealing ring (500) so that said sealing ring (500) can be deformed in an axial direction of the power hub (1 ba).

6. The chain drill of the pile driver under power as claimed in claim 1, wherein the sealing ring (500) is sleeved with an elastic ring (600), and the elastic ring (600) can be pressed to fit the sealing ring (500) and the sealing cover (300).

7. The power-down pile driver chain drill bit as recited in claim 1, wherein there are at least two dynamic sealing elements, and a spacer ring (700) sleeved on the power wheel shaft sleeve (1ba) is disposed between adjacent dynamic sealing elements.