CN203701977U - Diameter-variable underreaming drill and drilling machine - Google Patents
Diameter-variable underreaming drill and drilling machine Download PDFInfo
- Publication number
- CN203701977U CN203701977U CN201320876813.8U CN201320876813U CN203701977U CN 203701977 U CN203701977 U CN 203701977U CN 201320876813 U CN201320876813 U CN 201320876813U CN 203701977 U CN203701977 U CN 203701977U
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- bit body
- piston
- expanding drill
- drill
- bottom expanding
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Abstract
The utility model discloses a diameter-variable underreaming drill and a drilling machine. The diameter-variable underreaming drill comprises a cylindrical drill body and drill bits at the lower end of the drill body, the drill body is provided with at least one swinging expanding wing, the inside of the drill body is provided with a piston which can move vertically along the inner wall of the drill body, and the piston divides the inside of the drill body into an upper cavity and a lower cavity; the piston is connected with the expanding wing and drives the expanding wing to open and close; oil inlets are formed at the upper end of the drill body and the oil inlet is communicated with the upper cavity; the lower cavity is provided with a reset unit for driving the piston to move upwards for resetting, and the reset unit is connected with the lower end of the piston and the lower end of the drill body. According to the diameter-variable underreaming drill, the drill body serves as the cylinder barrel of an oil cylinder and is internally provided with the piston to drive the expanding wing to expand and further to achieve expanded drilling, so that an independent expanding wing driving oil cylinder can be structurally omitted; meanwhile, the drill body is only provided with one oil port to improve the layout of pipelines, thereby being simpler in structure, facilitating manufacturing and machining and reducing the cost.
Description
Technical field
The utility model relates to engineering machinery field, particularly a kind of reducing bottom expanding drill and be provided with the drilling machine of this reducing bottom expanding drill.
Background technology
At present, in most of capital workss, the construction of pile foundation is a very important link.Castinplace pile and preformed pile are the pile foundation construction methods of generally applying in engineering.Under some geological conditions, according to designing requirement, need stake to there is high bearing capacity, in order to promote the bearing capacity of whole pile, conventionally make an enlarged footing at pile crown or middle part, this requires, in the time of boring, to expand boring aperture in precalculated position.
Existingly can realize the drill bit that reaming creeps into and all in existing drilling pipe, set up expansion wing structure, and in cylinder bores, arrange to drive and expand the driving oil cylinder opened of chord, in the time of normal boring, expanding the wing is contracted on cylinder brill outer wall, need to expand aperture boring time, by to driving oil cylinder fuel feeding, drive expansion chord to open, utilize the expansion wing to carry out reaming and creep into.
Although this existing structure can realize reaming, structurally there are some problems in it.Existing drill bit is directly driving oil cylinder to be arranged on to drill bit internal, and this requires drill bit internal space to want sufficient, and therefore, this structure is only applicable to large diameter drill bit; For the slightly little drill bit of diameter, driving oil cylinder is directly set therein, and can realize the effect that expands the wing that drives, this makes to drive the installation of oil cylinder more difficult, meanwhile, in limited inner space, drive the pipeline of oil cylinder to be also difficult to arrange, and make the structure of drill bit internal and production technology more complicated, improved cost of production.
Therefore, need badly a kind of new drill bit is provided, when it can be realized reaming and creeps into, can also address the above problem.
Utility model content
In view of this, the utility model proposes a kind of reducing bottom expanding drill and the drilling machine that is provided with this reducing bottom expanding drill, this reducing bottom expanding drill can be realized reaming and creep into, and simple and reliable for structure, not fragile, is convenient to produce.
On the one hand, the utility model provides a kind of reducing bottom expanding drill, comprise tubular bit body, be arranged on the brill tooth of described bit body lower end, on described bit body, be provided with at least one swingable expansion wing, in described bit body, being provided with the piston that can move up and down along its inwall, is epicoele and cavity of resorption by the interior separation of described bit body; Described piston is connected with the described expansion wing, drives described expansion chord to open and regain;
Described bit body upper end offers oil-in, and described oil-in is communicated with described epicoele;
In described cavity of resorption, be provided with make described piston move up reset resetting means, described resetting means is connected with the lower end of described piston and the lower end of described bit body.
Further, on described piston, be provided with along its axially extended tooth bar;
The position of the corresponding described tooth bar of described bit body offers opening, and described open outer side is provided with the gear coordinating with described tooth bar, and described gear is fixedly attached to gear shaft, and described gear shaft is erected on described bit body rotationally;
One end of the described expansion wing is fixedly attached to described gear shaft.
Further, on described bit body, be provided with at the described gear of correspondence place the gear cover that covers described gear, described gear shaft is arranged on described bit body by described gear cover, and a part for described gear shaft and the described expansion wing are positioned at the outside of described gear cover.
Further, in the epicoele of described bit body, be provided with piston upper limit position block; And/or,
Described bit body cavity of resorption bottom is provided with piston lower position block.
Further, described piston upper limit position block is the annular slab being arranged on described bit body inwall.
Further, described piston lower position block is and the cylinder of the coaxial setting of described bit body that the bottom of described cylinder is connected with the inwall of described bit body bottom;
Described resetting means is spring, and described spring housing is located on described cylinder, and the lower end of described spring is connected to the bottom of described cylinder.
Further, the top of described epicoele is provided with upper sealing panel, and described oil-in is opened on described upper sealing panel, in described oil-in, is equipped with oil inlet pipe.
Further, described reducing bottom expanding drill also comprises the termination that is arranged on described bit body lower end, and described brill tooth is arranged on the below of described termination;
And, to run through described bit body and be arranged on the Grouting Pipe in described bit body, the lower end of described Grouting Pipe is positioned at described termination.
Further, be provided with two described expansion wings on described bit body, the periphery of the relatively described bit body of the described expansion wing is evenly arranged.
On the other hand, the utility model also provides a kind of drilling machine, and it is provided with the reducing bottom expanding drill described in as above any one.
The reducing that the utility model provides expands subdrilling bit body is redesigned, and its inwall is processed, and sets it as cylinder tube, and movably piston is set therein, has piston driving to expand the wing and swings folding, realizes reaming and creeps into; And a hydraulic fluid port is set only to this bit body, hydraulic fluid port is communicated with epicoele, to epicoele fuel feeding, piston is moved down by hydraulic fluid port, drives to expand the wing and opens, and then by the resetting means of cavity of resorption, makes to move on piston reset.Compared with existing diameter-enlarging drill bit, reducing expanding drill head tool of the present utility model has the following advantages:
1, directly using bit body as cylinder barrel, and the driven plunger that expands the wing is set therein, without providing independent driving oil cylinder for expanding the wing, simplified structure, reduces costs; And this structure is more suitable for the drill bit of minor diameter;
2, a hydraulic fluid port being set in the upper end of bit body, is only epicoele fuel feeding, for piston provides power, drives the expansion wing to open; At bit body cavity of resorption, resetting means is set, utilizes the active force of resetting means to drive the expansion wing to regain; Thus, simplify fluid pipeline, make the layout of pipeline easier;
3, utilize rack and pinion to coordinate and drive and expand the wing, can realize and expand the wing by the pressure-driven of hydraulic oil and regain, make to expand the wing and can overcome the resistance of native stone or concrete grout, more easily regain; Between gear and the expansion wing, adopt gear shaft to connect, the piston that gear cover protection gear can be set thus and expose, avoids contacting with concrete grout, extends its application life.
Brief description of the drawings
The accompanying drawing that forms a part of the present utility model is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
The structural representation of a kind of reducing bottom expanding drill that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the sectional drawing of reducing bottom expanding drill shown in Fig. 1;
Fig. 3 is the structural representation of reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is packed up;
Fig. 4 is the structural representation of reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is opened;
Fig. 5 is the structural representation of reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is upwards packed up.
Description of reference numerals
10-bit body; 11-upper sealing panel; 12-sealing ring; 13-oil inlet pipe; 14-termination; 20-bores tooth; 30-expands the wing; 31-gear; 32-gear shaft; 33-key; 35-gear cover; 40-piston; 41-tooth bar; 42-resetting means; 43-piston upper limit position block; 44-piston lower position block; 50-Grouting Pipe; 60-helical blade; 70-connects square toes.
Detailed description of the invention
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail:
The structural representation of a kind of reducing bottom expanding drill that Fig. 1 provides for the utility model embodiment; Fig. 2 is the sectional drawing of reducing bottom expanding drill shown in Fig. 1; Fig. 3 is the structural representation of reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is packed up; Fig. 4 is the structural representation of the reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is opened, and Fig. 5 is the structural representation of reducing bottom expanding drill shown in Fig. 1 in the time that the expansion wing is upwards packed up.
Shown in Fig. 1 and Fig. 2, the reducing bottom expanding drill that the utility model embodiment provides comprises tubular bit body 10, be arranged on the brill tooth 20 of these bit body 10 lower ends, on bit body 10, being also provided with two swingable 30, two expansion wings 30 of the expansion wings is arranged in the periphery of bit body 10 equably.
In bit body 10, being provided with the piston 40 that can move up and down along its inwall, is epicoele and cavity of resorption by the interior separation of bit body 10.Piston 40 is connected with the expansion wing 30, drives the expansion wing 30 to swing up and down, and realizes and opens and regain.
The upper end of bit body 10 offers oil-in, and oil-in is communicated with epicoele; In the cavity of resorption of bit body 10, be provided with make piston 40 move up reset resetting means 42, resetting means 42 is connected with the lower end of piston 40 and the lower end of bit body 10.
Reducing in this embodiment expands subdrilling bit body 10 is redesigned, and its inwall is processed, and sets it as cylinder tube, and movably piston 40 is set therein, has piston 40 to drive the expansion wing 30 to swing folding; And a hydraulic fluid port is set only to this bit body 10, hydraulic fluid port is communicated with epicoele, to epicoele fuel feeding, piston 40 is moved down by hydraulic fluid port, drives the expansion wing 30 to open, and then, by the resetting means 42 of cavity of resorption, makes to move reset on piston 40.Therefore, this reducing of the present utility model expand subdrilling using bit body as cylinder tube, and piston is set therein, and drive expansion chord to open, realize reaming and creep into, this structure is without arranging that independently expands a wing driving oil cylinder, and bit body only adopts a hydraulic fluid port, improve the layout of pipeline, the structure that this reducing expands subdrilling is simpler, be convenient to production and processing, reduced cost.
Particularly, as shown in Figure 2, be provided with along its axially extended tooth bar 41 on piston 40, on bit body 10, the position of corresponding tooth bar 41 offers opening, and open outer side is provided with the gear 31 coordinating with tooth bar 41, and this gear 31 is fixedly attached on gear shaft 32.Gear 31 is preferably fixedly connected with gear shaft 32 by key 33, and gear shaft 32 is erected on bit body 10 rotationally, and the one end that expands the wing 30 is also fixedly attached to this gear shaft 32, and the other end is protruding, extends to the direction away from bit body 10 upper sheds.Piston 40 and tooth bar 41 synchronizing movings like this, tooth bar 41 driven gears 31 and gear shaft 32 synchronously rotate, and then drive the expansion wing 30 to swing.
On bit body 10, the position of corresponding described gear 31 is provided with the gear cover 35 that covers this gear 31, gear shaft 32 is erected on bit body 10 by the wallboard of gear cover 35, and a part for gear shaft 32 and the expansion wing 30 are all positioned at gear cover 35 outsides, only there are gear 31 and operative gear axle 32 to be positioned at gear cover 35, at reducing bottom expanding drill in drilling process, gear cover 35 can prevent native stone or concrete grout and Gear Contact, and can prevent that native stone or concrete grout contact are because bit body 10 upper sheds are exposed to outer piston 40, avoid native stone or concrete grout to affect the normal work and use life-span of gear 31 and piston 40.
The top of bit body 10 is provided with upper sealing panel 11, between the top of piston 40 and the inwall of bit body 10, is also provided with sealing ring 12, and the epicoele of bit body 10 is sealed to a confined space, prevents oil liquid leakage.Aforesaid oil-in is opened on upper sealing panel 11, for the ease of to epicoele fuel feeding, is equipped with oil inlet pipe 13 in oil-in, and oil inlet pipe 13 is communicated with epicoele and bit body 10 outsides, is connected with hydraulic circuit.But, in this embodiment, with the name of oil-in and oil inlet pipe, it will be appreciated by those skilled in the art that at piston the fluid in epicoele can pass through this oil inlet pipe (or oil-in) draining upwards when reset movement.
In the epicoele of bit body 10, be provided with piston upper limit position block 43, the extreme position moving up for limited piston 30, as preferably, as shown in Figure 2, this piston upper limit position block 43 can be configured to be arranged on the annular slab on bit body 10 inwalls, fluid can, by the hole in the middle of annular slab, act on piston 40.
In the cavity of resorption of bit body 10, be provided with piston lower position block 44, the extreme position moving down for limited piston; As shown in Figure 2, piston lower position block 44 is preferably the cylinder with the coaxial setting of bit body 10, and the base diameter of cylinder is larger than the diameter of stack shell, is connected with the inwall of bit body 10 bottoms.Resetting means 42 in cavity of resorption is preferably spring, and this spring housing is located on the stack shell of piston limit piece 44, and lower end is connected to the bottom of piston lower position block 44, and upper end connects the lower end of piston 40.
While utilizing bit bore, according to construction requirement, need in hole, inject concrete grout or mud etc., therefore, this reducing bottom expanding drill also comprises that running through bit body 10 is arranged on the Grouting Pipe 50 in bit body 10, Grouting Pipe 50 is from top to bottom successively through upper sealing panel 11, piston upper limit position block 43, piston 40, back-moving spring, piston lower position block 44, until the lower end of Grouting Pipe 50 is positioned at the termination 14 that is arranged on bit body 10 lower ends.The brill tooth 20 of reducing bottom expanding drill is arranged on the below of termination 14.
According to boring needs, the periphery of bit body 10 can also be provided with helical blade 60, is convenient to the boring work of drill bit.Bit body 10 upper ends are provided with and connect square toes 70, for the structures such as this drill bit and drilling rod are connected.In addition, although the expansion wing 30 in the present embodiment has two, in other embodiments, expand the wing 30 and can be configured to one, three or more, be configured to when multiple, expand the wing 30 and can evenly be arranged in the periphery of bit body.In this embodiment, the resetting means 42 arranging in cavity of resorption is configured to spring, also can adopt other forms of resetting means in other embodiment, as long as this resetting means is after piston moves down, reset can move up piston.
With reference to Fig. 3, Fig. 4 and Fig. 5, the expansion span open procedure of this reducing bottom expanding drill is as follows:
As shown in Figure 3, when piston 40 is located thereon extreme position, expand the wing 30 straight down, near bit body 10, in retrieving position.Need to expand the wing and open time, as shown in Figure 4, by oil inlet pipe 13 to fuel feeding in epicoele, piston 40 is subject to the pressure of hydraulic oil, moves down, and tooth bar 41 moves down with piston 40, and driven gear 31 rotates, gear 31 is driven and is expanded the wings 30 and upwards swing upset by gear shaft 32; The distance moving down by control piston 40, can adjust the open angle that expands the wing 30, makes reducing bottom expanding drill have different external diameters, drill through the enlarged footing of different diameters, the wing 30 to be expanded turn to the open position of expection, fuel cut-off, piston 40 and 30 stop motions of the expansion wing.Wait hole complete or upwards carry bore time, need to regain expanding the wing 30, now, continue by oil inlet pipe 13, to fuel feeding in epicoele, to make piston 40 continue to move down, tooth bar 41 continues driven gear 31 and rotates, and then expand the wing 30 and continue upwards to swing, contact with piston lower position block 44 to piston 40, reach limit inferior position, expand the wing 30 and be upwards rocked to vertical position, regain with bit body 10 laminatings.Then, mention behind ground until drill bit entirety, by oil inlet pipe 13 drainings, the active force that utilizes resetting means 42 is piston 40 resets that move up, and then drives the expansion wing to turn to initial retrieving position downwards.The expansion wing of reducing bottom expanding drill of the present utility model can be realized and be expanded wing withdrawal by hydraulic oil fuel feeding, makes the active force of withdrawal larger, easily overcomes the resistance of earth or concrete grout.
Compared with existing diameter-enlarging drill bit, reducing bottom expanding drill tool of the present utility model has the following advantages:
1, directly using bit body as cylinder barrel, and the driven plunger that expands the wing is set therein, without providing independent driving oil cylinder for expanding the wing, simplified structure, reduces costs; And this structure is more suitable for the drill bit of minor diameter;
2, a hydraulic fluid port being set in the upper end of bit body, is only epicoele fuel feeding, for piston provides power, drives the expansion wing to open; At bit body cavity of resorption, resetting means is set, utilizes the active force of resetting means to drive the expansion wing to regain; Thus, simplify fluid pipeline, make the layout of pipeline easier;
3, utilize rack and pinion to coordinate and drive and expand the wing, can realize and expand the wing by the pressure-driven of hydraulic oil and regain, make to expand the wing and can overcome the resistance of native stone or concrete grout, more easily regain; Between gear and the expansion wing, adopt gear shaft to connect, the piston that gear cover protection gear can be set thus and expose, avoids contacting with concrete grout, extends its application life.
Embodiment of the present utility model also provides a kind of drilling machine, and it is provided with above-mentioned reducing bottom expanding drill.This drilling machine uses the boring of this reducing bottom expanding drill, therefore has a little as abovely, repeats no more.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a reducing bottom expanding drill, comprises tubular bit body (10), is arranged on the brill tooth (20) of described bit body (10) lower end, is provided with at least one swingable expansion wing (30) on described bit body (10), it is characterized in that,
In described bit body (10), being provided with the piston (40) that can move up and down along its inwall, is epicoele and cavity of resorption by the interior separation of described bit body (10); Described piston (40) is connected with the described expansion wing (30), drives the described expansion wing (30) open and regain;
Described bit body (10) upper end offers oil-in, and described oil-in is communicated with described epicoele;
In described cavity of resorption, be provided with make described piston (40) move up reset resetting means (42), described resetting means (42) is connected with the lower end of described piston (40) and the lower end of described bit body (10).
2. reducing bottom expanding drill according to claim 1, is characterized in that, is provided with along its axially extended tooth bar on described piston (40);
The position of the corresponding described tooth bar of described bit body (10) offers opening, described open outer side is provided with the gear (31) coordinating with described tooth bar, described gear (31) is fixedly attached to gear shaft (32), and described gear shaft (32) is erected on described bit body (10) rotationally;
One end of the described expansion wing (30) is fixedly attached to described gear shaft (32).
3. reducing bottom expanding drill according to claim 2, it is characterized in that, described bit body (10) is upper locates to be provided with at the described gear of correspondence (31) gear cover (35) that covers described gear (31), it is upper that described gear shaft (32) is arranged on described bit body (10) by described gear cover (35), and a part for described gear shaft (32) and the described expansion wing (30) are positioned at the outside of described gear cover (35).
4. reducing bottom expanding drill according to claim 3, is characterized in that, is provided with piston upper limit position block (43) in the epicoele of described bit body (10); And/or,
Described bit body (10) cavity of resorption bottom is provided with piston lower position block (44).
5. reducing bottom expanding drill according to claim 4, is characterized in that, described piston upper limit position block (43) is for being arranged on the annular slab on described bit body (10) inwall.
6. reducing bottom expanding drill according to claim 5, is characterized in that, described piston lower position block (44) is and the cylinder of the coaxial setting of described bit body (10) that the bottom of described cylinder is connected with the inwall of described bit body (10) bottom;
Described resetting means (42) is spring, and described spring housing is located on described cylinder, and the lower end of described spring is connected to the bottom of described cylinder.
7. reducing bottom expanding drill according to claim 6, is characterized in that, the top of described epicoele is provided with upper sealing panel (11), and it is upper that described oil-in is opened in described upper sealing panel (11), is equipped with oil inlet pipe (13) in described oil-in.
8. reducing bottom expanding drill according to claim 7, is characterized in that, described reducing bottom expanding drill also comprises the termination (14) that is arranged on described bit body (10) lower end, and described brill tooth (20) is arranged on the below of described termination (14);
And, to run through described bit body (10) and be arranged on the Grouting Pipe (50) in described bit body (10), the lower end of described Grouting Pipe (50) is positioned at described termination (14).
9. according to the reducing bottom expanding drill described in any one in claim 1-8, it is characterized in that, on described bit body (10), be provided with two described expansion wings (30), the periphery of the relatively described bit body of the described expansion wing (30) (10) is evenly arranged.
10. a drilling machine, is characterized in that, is provided with the reducing bottom expanding drill as described in any one in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320876813.8U CN203701977U (en) | 2013-12-26 | 2013-12-26 | Diameter-variable underreaming drill and drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320876813.8U CN203701977U (en) | 2013-12-26 | 2013-12-26 | Diameter-variable underreaming drill and drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203701977U true CN203701977U (en) | 2014-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320876813.8U Expired - Fee Related CN203701977U (en) | 2013-12-26 | 2013-12-26 | Diameter-variable underreaming drill and drilling machine |
Country Status (1)
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| CN (1) | CN203701977U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337657A (en) * | 2016-11-24 | 2017-01-18 | 合肥工业大学 | Deformable rotary drill bit |
| CN106985219A (en) * | 2017-04-12 | 2017-07-28 | 重庆市永川区植成家俱厂 | A kind of plate drilling device of drill bit reducing |
| CN108590742A (en) * | 2018-05-10 | 2018-09-28 | 西安科技大学 | Reducing reaming improves the mine gas extraction system and method for gas extraction concentration |
| CN109667547A (en) * | 2018-12-07 | 2019-04-23 | 北京三智造科技有限公司 | Diameter changeable drill bit |
| CN110107344A (en) * | 2019-06-12 | 2019-08-09 | 河南城建学院 | The electrodeless expanding type gas drainage hole drilling of one kind makes cave device and method |
| CN110700242A (en) * | 2019-10-24 | 2020-01-17 | 江苏科星电气有限公司 | Construction device for pile end bottom expanding of electric power engineering concrete cast-in-place pile |
| CN114352207A (en) * | 2021-11-30 | 2022-04-15 | 中国矿业大学 | Hydraulic transmission type variable-diameter PDC drill bit |
-
2013
- 2013-12-26 CN CN201320876813.8U patent/CN203701977U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337657A (en) * | 2016-11-24 | 2017-01-18 | 合肥工业大学 | Deformable rotary drill bit |
| CN106985219A (en) * | 2017-04-12 | 2017-07-28 | 重庆市永川区植成家俱厂 | A kind of plate drilling device of drill bit reducing |
| CN106985219B (en) * | 2017-04-12 | 2019-02-19 | 重庆市永川区植成家俱厂 | A kind of plate drilling device of drill bit reducing |
| CN108590742A (en) * | 2018-05-10 | 2018-09-28 | 西安科技大学 | Reducing reaming improves the mine gas extraction system and method for gas extraction concentration |
| CN108590742B (en) * | 2018-05-10 | 2019-02-26 | 西安科技大学 | The mine gas extraction system and method for variable diameter reaming raising gas extraction concentration |
| CN109667547A (en) * | 2018-12-07 | 2019-04-23 | 北京三智造科技有限公司 | Diameter changeable drill bit |
| CN109667547B (en) * | 2018-12-07 | 2023-10-24 | 北京三一智造科技有限公司 | Variable diameter drill bit |
| CN110107344A (en) * | 2019-06-12 | 2019-08-09 | 河南城建学院 | The electrodeless expanding type gas drainage hole drilling of one kind makes cave device and method |
| CN110107344B (en) * | 2019-06-12 | 2024-04-05 | 河南城建学院 | Electrodeless expanding type gas extraction hole drilling and hole making device and method |
| CN110700242A (en) * | 2019-10-24 | 2020-01-17 | 江苏科星电气有限公司 | Construction device for pile end bottom expanding of electric power engineering concrete cast-in-place pile |
| CN114352207A (en) * | 2021-11-30 | 2022-04-15 | 中国矿业大学 | Hydraulic transmission type variable-diameter PDC drill bit |
| CN114352207B (en) * | 2021-11-30 | 2024-03-22 | 中国矿业大学 | Hydraulic transmission type diameter-variable PDC drill bit |
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Granted publication date: 20140709 Termination date: 20151226 |
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