CN210315521U - Stirring drill bit based on it hinders mode to fall realizes deep stirring - Google Patents
Stirring drill bit based on it hinders mode to fall realizes deep stirring Download PDFInfo
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- CN210315521U CN210315521U CN201921189494.7U CN201921189494U CN210315521U CN 210315521 U CN210315521 U CN 210315521U CN 201921189494 U CN201921189494 U CN 201921189494U CN 210315521 U CN210315521 U CN 210315521U
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Abstract
The utility model discloses a stirring drill bit for realizing deep stirring based on a resistance reduction mode, which belongs to the technical field of pile foundation construction and comprises a stirring module, a drill rod module and a supporting module; the drill rod module comprises an inner drill rod, an outer drill rod and an outer casing; the stirring module comprises a drill bit, a main stirring blade, a No. 1 re-stirring blade, a No. 2 re-stirring blade, a No. 3 re-stirring blade and a No. 4 re-stirring blade; the outer drill rod is provided with continuous helical blades from the upper part of the bearing to the top end on the outer drill rod body; the support module is a cylindrical shell structure with an open lower port, and comprises a fixing component and a limiting component, wherein the limiting component comprises a limiting switch, a rotating baffle and a limiting convex tooth. The utility model discloses a set up the double drill rod that double dynamical head drove, five layers of stirring vane and support module have not only reduced and have covered soil pressure, carry out the soil body level and fore-and-aft all-round stirring moreover, become the stake quality better.
Description
Technical Field
The utility model relates to a pile foundation construction technical field, concretely relates to stirring drill bit based on fall and hinder the mode and realize deep stirring.
Background
The deep stirring technology is formally applied to engineering practice since the seventies of the twentieth century, and is widely applied to the construction of industrial and civil buildings, subways, highways, municipal works, water conservancy projects, port and navigation channels, offshore facilities and the like at present. A deep-layer cement-soil stirring pile for reinforcing the soft foundation features that cement is used as solidifying agent, and a special stirring machine and slurry pump are used to forcibly stir and mix the soft soil and solidifying agent in deep foundation.
With the wide application of the deep stirring technology, the design depth of the stirring pile is deeper and deeper, so that the drilling machine has larger overburden load during drilling, and simultaneously, the lower blade has larger resistance, thereby reducing the engineering construction efficiency. The guniting port of the conventional stirring drill bit is arranged on the drill rod, and slurry is difficult to reach the edge of the stirring pile due to high pressure during deep stirring, so that the pile forming quality is poor. Although the bottom of the stirring blade is provided with the nozzle, when the stirring shaft is lifted and rotated, a certain gap is generated at the bottom of the upper stirring blade, and the compressed air for the improved material is sprayed into the gap from the root of the upper stirring blade through the stirring shaft. This arrangement of the nozzle solves the problem to some extent. But the effect is limited due to the small void area at the bottom of the blade and the fast filling speed of the soil into the void.
Therefore, the excessive resistance becomes a prominent problem restricting the development of the large-diameter deep mixing pile, and how to reduce the resistance received by the drill during deep mixing becomes a problem to be solved urgently. Based on this, the utility model provides a stirring drill bit based on fall and hinder the mode and realize deep stirring.
Disclosure of Invention
To the above-mentioned technical problem who exists among the prior art, the utility model provides a based on fall and hinder the stirring drill bit that the mode realized deep stirring, overcome prior art's not enough. Through setting up double-power-head driven double drill rod, five layers of stirring vane and support module, not only reduced and covered soil pressure, carry out the horizontal and fore-and-aft all-round stirring with the soil body moreover, it is better to become the stake quality.
Stirring drill bit based on fall and hinder mode realization deep stirring, its characterized in that: the device comprises a stirring module, a drill rod module and a supporting module; the drill rod module comprises an inner drill rod, an outer drill rod and an outer sleeve, the inner drill rod and the outer drill rod are driven by double power heads, and the rotating directions of the inner drill rod and the outer drill rod are opposite;
the stirring module comprises a drill bit, a main stirring blade, a No. 1 re-stirring blade, a No. 2 re-stirring blade, a No. 3 re-stirring blade and a No. 4 re-stirring blade; the arrangement sequence of the stirring modules from bottom to top is respectively as follows: the device comprises a drill bit, a main stirring blade, a No. 1 complex stirring blade, a No. 2 complex stirring blade, a No. 3 complex stirring blade and a No. 4 complex stirring blade; the main stirring blade is welded on the inner drill rod, the outer edges of the main stirring blade and the No. 2 complex stirring blade are simultaneously welded on the same vertical connecting rod body, the length of the main stirring blade is the same as that of the No. 2 complex stirring blade, and the No. 2 complex stirring blade is connected with the outer drill rod through a bearing, so that the main stirring blade drives the No. 2 complex stirring blade to rotate through the vertical connecting rod body; the No. 1 secondary stirring blade is welded on the external drill rod, and the radius of the secondary stirring blade is 0.5-0.9 time of the radius of the main stirring blade; the No. 3 re-stirring blade and the No. 4 re-stirring blade are both welded on an external drill rod, the No. 3 re-stirring blade is an arc-shaped blade in the horizontal direction, the outer edge of the No. 3 re-stirring blade forms arc-shaped bending along the rotating direction of the external drill rod, the upper surface and the lower surface of the outer edge of the No. 4 re-stirring blade are respectively provided with a drainage device, the drainage devices are in a regular triangular table shape, the drainage devices are connected with the No. 4 re-stirring blade in a welding manner, and the rotation of the stirring blades enables the drainage devices to drive peripheral soil bodies to move towards; the main stirring blade and the drill bit are provided with drill teeth;
the outer drill rod is provided with continuous helical blades from the upper part of the bearing to the top end, the outer drill rod is provided with a sleeve pipe from the upper part of the No. 4 re-stirring blade to the upper part of the support module by 10-200cm, the upper end and the lower end of the sleeve pipe are respectively provided with 2-4 horizontal connecting rod pieces which are connected with the outer drill rod, and the horizontal connecting rod pieces are connected with the sleeve pipe and the outer drill rod in a welding mode;
the supporting module is a cylindrical shell structure with an open lower port, and the supporting module is connected with the external sleeve through welding; the support module includes fixed component and stop member, and the stop member includes limit switch, whirl baffle and spacing dogtooth, and limit switch adopts hydraulic pressure mode drive, can make whirl baffle rotatory round outside drilling rod through limit switch to make support module open or closed, when whirl baffle rotated 90 degrees, made spacing dogtooth and fixed component touching, thereby restriction whirl baffle continues to rotate.
Preferably, the rotating baffle and the fixed component are made of high-strength alloy materials, the thickness of the rotating baffle is 5mm-50mm, and the yield strength of the rotating baffle and the fixed component is more than 235 MPa.
Preferably, the width of the main stirring blade is 5-50cm, and the width of the No. 1 re-stirring blade, the No. 2 re-stirring blade, the No. 3 re-stirring blade and the No. 4 re-stirring blade is 0.1-0.5 times of the width of the main stirring blade.
Preferably, the support module is positioned above the complex stirring blades and is 1-10m away from the complex stirring blades, the diameter of the support module is 0.85-0.95 times of that of the main stirring blades, and the diameter of the main stirring blades is 0.5-3.0 m.
Preferably, the rotary baffle of the support module is in an open state in the drilling process, when the stirring resistance is remarkably increased, the support module starts to be closed, the rotary baffle is opened after the drill rod moves downwards for 5-10m, the support module starts to be closed after the drill rod is horizontally rotated for 1-5min while keeping the height of the drill rod unchanged after the rotary baffle is opened, the rotary baffle is opened after the drill rod moves downwards for 5-10m, the circulation operation is carried out according to the mode, and the drill rod is lifted to the orifice to complete the stirring construction process after the drill rod is stirred to the set depth.
The utility model discloses the beneficial technological effect who brings:
(1) the inner drill rod and the outer drill rod are driven by double power heads, and the rotating directions of the inner drill rod and the outer drill rod are opposite to each other, so that the main stirring blade and the four layers of complex stirring blades are driven to rotate, the soil body is stirred to the maximum extent, and the soil body and the slurry are mixed more uniformly; (2) the drainage device is arranged at the edge of the No. 4 re-stirring blade, and the tail part of the No. 3 re-stirring blade is arranged in a hook shape, so that the soil body can be stirred transversely; (3) through setting up the support module, when the pressure is too big on the soil body, extract the lower part soil body, reduce and cover soil pressure.
Drawings
Fig. 1 is the utility model discloses a structure schematic diagram of stirring drill bit based on fall to hinder the mode and realize deep stirring.
Figure 2 is the utility model discloses structure plan view based on fall and hinder the stirring drill bit that the mode realized deep stirring.
Fig. 3 is the utility model discloses support module's top view in stirring drill bit based on fall to hinder the mode and realize deep stirring.
Wherein, 1-inner drill rod; 2-an outer drill rod; 3-an outer sleeve; 4-a drill bit; 5-main stirring blades; number 6-1 repeated stirring blades; no. 7-2 repeated stirring blades; 8-3 number of repeated stirring blades; number 9-4 re-stirring blades; 10-vertical connecting rod body; 11-a drainage device; 12-drilling teeth; 13-a support module; 14-a fixation member; 15-limit switch; 16-a rotating baffle; 17-limit convex teeth.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
example 1:
carrying out a model pile stirring test in a miscellaneous fill field, setting the pile forming depth to be 15m, adopting a cement soil stirring method for construction, setting A, B two groups of tests, wherein each group is provided with 3 test pieces, and the group A is an experimental group and selects the stirring drill bit introduced in the utility model; group B is a control group, a stirring drill bit universal in the market is adopted, and the specific technology is as follows:
as shown in fig. 1-3, the stirring drill bit for realizing deep stirring based on the resistance reduction mode is characterized in that: comprises a stirring module, a drill rod module and a supporting module 13; the drill rod module comprises an inner drill rod 1, an outer drill rod 2 and an outer casing 3, the inner drill rod 1 and the outer drill rod 2 are driven by double power heads, and the rotating directions of the inner drill rod 1 and the outer drill rod 2 are opposite;
the stirring module comprises a drill bit 4, a main stirring blade 5, a No. 1 complex stirring blade 6, a No. 2 complex stirring blade 7, a No. 3 complex stirring blade 8 and a No. 4 complex stirring blade 9; the arrangement sequence of the stirring modules from bottom to top is respectively as follows: a drill 4, a main stirring blade 5, a No. 1 re-stirring blade 6, a No. 2 re-stirring blade 7, a No. 3 re-stirring blade 8 and a No. 4 re-stirring blade 9; the main stirring blade 5 is welded on the inner drill rod 1, the outer edges of the main stirring blade 5 and the No. 2 re-stirring blade 7 are simultaneously welded on the same vertical connecting rod body 10, the lengths of the main stirring blade 5 and the No. 2 re-stirring blade 7 are the same, and the No. 2 re-stirring blade 7 is connected with the outer drill rod 2 through a bearing, so that the main stirring blade 5 drives the No. 2 re-stirring blade 7 to rotate through the vertical connecting rod body 10; the No. 1 complex mixing blade 6 is welded on the external drill rod 2, and the radius of the complex mixing blade is 0.5-0.9 time of the radius of the main mixing blade 5; the No. 3 re-stirring blades 8 and the No. 4 re-stirring blades 9 are welded on the external drill rod 2, the No. 3 re-stirring blades 8 are arc-shaped blades in the horizontal direction, the outer edges of the No. 3 re-stirring blades 8 form arc-shaped curves along the rotating direction of the external drill rod 2, the upper surface and the lower surface of the outer edges of the No. 4 re-stirring blades 9 are respectively provided with a drainage device 11, the drainage devices 11 are in a regular triangular frustum shape, the drainage devices 11 are connected with the No. 4 re-stirring blades 9 in a welding mode, and the rotation of the stirring blades enables the drainage devices 11 to drive peripheral soil bodies to move towards the axis; the main stirring blade 5 and the drill bit 4 are both provided with drill teeth 12;
the outer drill rod 2 is provided with continuous helical blades from the upper part of the bearing to the top end, the outer drill rod 2 is provided with a sleeve from the upper part of the No. 4 re-stirring blade 9 to the upper part of the support module by 100cm, the upper end and the lower end of the sleeve are respectively provided with 2 horizontal connecting rods which are connected with the outer drill rod, and the horizontal connecting rods are connected with the sleeve and the outer drill rod 2 in a welding mode;
the supporting module 13 is a cylindrical shell structure with an open lower port, and the supporting module 13 is connected with the outer sleeve 2 through welding; the supporting module 13 comprises a fixing component 14 and a limiting component, the limiting component comprises a limiting switch 15, a rotary baffle 16 and a limiting convex tooth 17, the limiting switch 15 is driven in a hydraulic mode, the rotary baffle 16 can rotate around the outer drill rod 2 through the limiting switch 15, the supporting module 13 is opened or closed, and when the rotary baffle 16 rotates 90 degrees, the limiting convex tooth 1 is made to touch the fixing component 14, and the rotary baffle 16 is limited from continuing to rotate.
Preferably, the rotating baffle 16 and the fixed component 14 are made of high-strength alloy materials, the thickness of the high-strength alloy materials is 20mm, and the yield strength of the high-strength alloy materials is 250 MPa.
Preferably, the width of the main stirring blade 1 is 30cm, and the widths of the No. 1 complex stirring blade 6, the No. 2 complex stirring blade 7, the No. 3 complex stirring blade 8 and the No. 4 complex stirring blade 9 are 0.3 times of the width of the main stirring blade 5.
Preferably, the supporting module 13 is located above the multiple stirring blades and is 2m away from the multiple stirring blades, the diameter of the supporting module 13 is 0.8 times that of the main stirring blade 5, and the diameter of the main stirring blade 5 is 1.5 m.
Preferably, the rotary baffle 16 of the support module 13 is in an open state in the drilling process, when the stirring resistance is significantly increased, the support module 13 starts to be closed, the rotary baffle 16 is opened after the drill rod moves downwards for 5m, after the rotary baffle 16 is opened, the drill rod is kept at a constant height and horizontally rotates for 3min, the support module 13 starts to be closed, the rotary baffle 16 is opened after the drill rod moves downwards for 5m, the circulation operation is performed according to the mode, and after the drill rod is stirred to a set depth, the drill rod is lifted to an orifice to complete the stirring construction process.
The average stirring resistance of A group's test piece is 30% of B group in the work progress, and the average mud returning amount of A group is 40% of B group, has fully embodied the utility model discloses a stirring drill bit fall hinders the effect.
Example 2:
it is experimental at certain construction place, add three experimental stakes during the test stake, the experimental stake of many addding adopts the utility model discloses a stirring drill bit, the design rule becomes the stake degree of depth and is 20m, adopts cement mixing method construction, and wherein, the soil layer in place is:
the specific process is as follows:
as shown in fig. 1-3, the stirring drill bit for realizing deep stirring based on the resistance reduction mode is characterized in that: comprises a stirring module, a drill rod module and a supporting module 13; the drill rod module comprises an inner drill rod 1, an outer drill rod 2 and an outer casing 3, the inner drill rod 1 and the outer drill rod 2 are driven by double power heads, and the rotating directions of the inner drill rod 1 and the outer drill rod 2 are opposite;
the stirring module comprises a drill bit 4, a main stirring blade 5, a No. 1 complex stirring blade 6, a No. 2 complex stirring blade 7, a No. 3 complex stirring blade 8 and a No. 4 complex stirring blade 9; the arrangement sequence of the stirring modules from bottom to top is respectively as follows: a drill 4, a main stirring blade 5, a No. 1 re-stirring blade 6, a No. 2 re-stirring blade 7, a No. 3 re-stirring blade 8 and a No. 4 re-stirring blade 9; the main stirring blade 5 is welded on the inner drill rod 1, the outer edges of the main stirring blade 5 and the No. 2 re-stirring blade 7 are simultaneously welded on the same vertical connecting rod body 10, the lengths of the main stirring blade 5 and the No. 2 re-stirring blade 7 are the same, and the No. 2 re-stirring blade 7 is connected with the outer drill rod 2 through a bearing, so that the main stirring blade 5 drives the No. 2 re-stirring blade 7 to rotate through the vertical connecting rod body 10; the No. 1 complex mixing blade 6 is welded on the external drill rod 2, and the radius of the complex mixing blade is 0.5-0.9 time of the radius of the main mixing blade 5; the No. 3 re-stirring blades 8 and the No. 4 re-stirring blades 9 are welded on the external drill rod 2, the No. 3 re-stirring blades 8 are arc-shaped blades in the horizontal direction, the outer edges of the No. 3 re-stirring blades 8 form arc-shaped curves along the rotating direction of the external drill rod 2, the upper surface and the lower surface of the outer edges of the No. 4 re-stirring blades 9 are respectively provided with a drainage device 11, the drainage devices 11 are in a regular triangular frustum shape, the drainage devices 11 are connected with the No. 4 re-stirring blades 9 in a welding mode, and the rotation of the stirring blades enables the drainage devices 11 to drive peripheral soil bodies to move towards the axis; the main stirring blade 5 and the drill bit 4 are both provided with drill teeth 12;
the outer drill rod 2 is provided with continuous helical blades from the upper part of the bearing to the top end, the outer drill rod 2 is provided with a sleeve from the upper part of the No. 4 re-stirring blade 9 to the upper part of the support module by 100cm, the upper end and the lower end of the sleeve are respectively provided with 2 horizontal connecting rods which are connected with the outer drill rod, and the horizontal connecting rods are connected with the sleeve and the outer drill rod 2 in a welding mode;
the supporting module 13 is a cylindrical shell structure with an open lower port, and the supporting module 13 is connected with the outer sleeve 2 through welding; the supporting module 13 comprises a fixing component 14 and a limiting component, the limiting component comprises a limiting switch 15, a rotary baffle 16 and a limiting convex tooth 17, the limiting switch 15 is driven in a hydraulic mode, the rotary baffle 16 can rotate around the outer drill rod 2 through the limiting switch 15, the supporting module 13 is opened or closed, and when the rotary baffle 16 rotates 90 degrees, the limiting convex tooth 1 is made to touch the fixing component 14, and the rotary baffle 16 is limited from continuing to rotate.
Preferably, the rotating baffle 16 and the fixed component 14 are made of high-strength alloy materials, the thickness of the high-strength alloy materials is 30mm, and the yield strength of the high-strength alloy materials is 270 MPa.
Preferably, the width of the main stirring blade 1 is 30cm, and the widths of the No. 1 complex stirring blade 6, the No. 2 complex stirring blade 7, the No. 3 complex stirring blade 8 and the No. 4 complex stirring blade 9 are 0.4 times of the width of the main stirring blade 5.
Preferably, the supporting module 13 is located above the multiple stirring blades and is 2m away from the multiple stirring blades, the diameter of the supporting module 13 is 0.9 times of the diameter of the main stirring blade 5, and the diameter of the main stirring blade 5 is 2.5 m.
Preferably, the rotary baffle 16 of the support module 13 is in an open state in the drilling process, when the stirring resistance is significantly increased, the support module 13 starts to be closed, the rotary baffle 16 is opened after the drill rod moves downwards for 5m, after the rotary baffle 16 is opened, the drill rod is kept at a constant height and horizontally rotates for 3min, the support module 13 starts to be closed, the rotary baffle 16 is opened after the drill rod moves downwards for 5m, the circulation operation is performed according to the mode, and after the drill rod is stirred to a set depth, the drill rod is lifted to an orifice to complete the stirring construction process.
The average stirring resistance of A group's test piece is 35% of B group in the work progress, and the average mud returning amount of A group is 43% of B group, has fully embodied the utility model discloses a stirring drill bit fall hinders the effect.
The utility model discloses based on fall and hinder the stirring drill bit that the mode realized deep stirring, through setting up the double-drill rod that double dynamical head drove, five layers of stirring vane and support module have not only reduced and have covered soil pressure, carry out the soil body level and fore-and-aft all-round stirring moreover, become the stake better quality.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention also belong to the protection scope of the present invention.
Claims (5)
1. Stirring drill bit based on fall and hinder mode realization deep stirring, its characterized in that: the device comprises a stirring module, a drill rod module and a supporting module; the drill rod module comprises an inner drill rod, an outer drill rod and an outer sleeve, the inner drill rod and the outer drill rod are driven by double power heads, and the rotating directions of the inner drill rod and the outer drill rod are opposite;
the stirring module comprises a drill bit, a main stirring blade, a No. 1 re-stirring blade, a No. 2 re-stirring blade, a No. 3 re-stirring blade and a No. 4 re-stirring blade; the arrangement sequence of the stirring modules from bottom to top is respectively as follows: the device comprises a drill bit, a main stirring blade, a No. 1 complex stirring blade, a No. 2 complex stirring blade, a No. 3 complex stirring blade and a No. 4 complex stirring blade; the main stirring blade is welded on the inner drill rod, the outer edges of the main stirring blade and the No. 2 complex stirring blade are simultaneously welded on the same vertical connecting rod body, the length of the main stirring blade is the same as that of the No. 2 complex stirring blade, and the No. 2 complex stirring blade is connected with the outer drill rod through a bearing, so that the main stirring blade drives the No. 2 complex stirring blade to rotate through the vertical connecting rod body; the No. 1 secondary stirring blade is welded on the external drill rod, and the radius of the secondary stirring blade is 0.5-0.9 time of the radius of the main stirring blade; the No. 3 re-stirring blade and the No. 4 re-stirring blade are both welded on an external drill rod, the No. 3 re-stirring blade is an arc-shaped blade in the horizontal direction, the outer edge of the No. 3 re-stirring blade forms arc-shaped bending along the rotating direction of the external drill rod, the upper surface and the lower surface of the outer edge of the No. 4 re-stirring blade are respectively provided with a drainage device, the drainage devices are in a regular triangular table shape, the drainage devices are connected with the No. 4 re-stirring blade in a welding manner, and the rotation of the stirring blades enables the drainage devices to drive peripheral soil bodies to move towards; the main stirring blade and the drill bit are provided with drill teeth;
the outer drill rod is provided with continuous helical blades from the upper part of the bearing to the top end, the outer drill rod is provided with a sleeve pipe from the upper part of the No. 4 re-stirring blade to the upper part of the support module by 10-200cm, the upper end and the lower end of the sleeve pipe are respectively provided with 2-4 horizontal connecting rod pieces which are connected with the outer drill rod, and the horizontal connecting rod pieces are connected with the sleeve pipe and the outer drill rod in a welding mode;
the supporting module is a cylindrical shell structure with an open lower port, and the supporting module is connected with the external sleeve through welding; the support module includes fixed component and stop member, and the stop member includes limit switch, whirl baffle and spacing dogtooth, and limit switch adopts hydraulic pressure mode drive, can make whirl baffle rotatory round outside drilling rod through limit switch to make support module open or closed, when whirl baffle rotated 90 degrees, made spacing dogtooth and fixed component touching, thereby restriction whirl baffle continues to rotate.
2. The stirring drill bit capable of realizing deep stirring based on the resistance reduction mode as claimed in claim 1, wherein the rotating baffle plate and the fixing member are made of high-strength alloy materials, the thickness of the rotating baffle plate is 5mm-50mm, and the yield strength of the rotating baffle plate is more than 235 MPa.
3. The stirring drill bit for realizing deep stirring based on the resistance reduction mode as claimed in claim 1, wherein the width of the main stirring blade is 5-50cm, and the width of the number 1 re-stirring blade, the number 2 re-stirring blade, the number 3 re-stirring blade and the number 4 re-stirring blade is 0.1-0.5 times of the width of the main stirring blade.
4. The stirring drill bit for realizing deep stirring based on the resistance reduction mode as claimed in claim 1, wherein the supporting module is located above the re-stirring blade and is 1-10m away from the re-stirring blade, the diameter of the supporting module is 0.85-0.95 times of the diameter of the main stirring blade, and the diameter of the main stirring blade is 0.5-3.0 m.
5. The stirring drill bit capable of realizing deep stirring based on the resistance reduction mode as claimed in claim 1, wherein the rotary baffle of the support module is in an open state during the drilling process, when the stirring resistance is significantly increased, the support module starts to close, the rotary baffle is opened after the drill rod moves downwards for 5-10m, the support module starts to close after the rotary baffle is opened and the drill rod keeps unchanged in height and rotates horizontally for 1-5min, the rotary baffle is opened after the drill rod moves downwards for 5-10m, the circulation operation is performed according to the method, and the drill rod is lifted to the orifice to complete the stirring construction process after the stirring is performed to the set depth.
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| CN201921189494.7U CN210315521U (en) | 2019-07-26 | 2019-07-26 | Stirring drill bit based on it hinders mode to fall realizes deep stirring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258544A (en) * | 2019-07-26 | 2019-09-20 | 北京中岩大地科技股份有限公司 | The stirring drill bit of deep-layer stirring is realized based on drop resistance mode |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258544A (en) * | 2019-07-26 | 2019-09-20 | 北京中岩大地科技股份有限公司 | The stirring drill bit of deep-layer stirring is realized based on drop resistance mode |
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