CN202148865U - Lock bottom opening mechanism, drilling tool and rotary drilling rig - Google Patents
Lock bottom opening mechanism, drilling tool and rotary drilling rig Download PDFInfo
- Publication number
- CN202148865U CN202148865U CN201120227857U CN201120227857U CN202148865U CN 202148865 U CN202148865 U CN 202148865U CN 201120227857 U CN201120227857 U CN 201120227857U CN 201120227857 U CN201120227857 U CN 201120227857U CN 202148865 U CN202148865 U CN 202148865U
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- unblanking
- dwang
- brill
- drilling tool
- drive block
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Abstract
The utility model relates to the technical field of engineering machinery and discloses a rotary drilling rig, drilling tool and lock bottom opening mechanism thereof, specifically a lock bottom opening mechanism, drilling tool and rotary drilling rig. The lock bottom opening mechanism comprises a compression bar mechanism having a compression bar and a compression block fixed on the compression bar; a drive mechanism having a drive block with one end propped against the compression block; a rotary rod mechanism having at least one rotary rod with top connected with the other end of the drive block and bottom provided with a hook, wherein the hook can be hooked on or separated from a hanging board on the drilling tool bottom when the at least one rotary rod is being rotated. The lock bottom opening mechanism provided by the utility model makes the rotary rod open or close the drilling tool bottom via torque, avoiding the stability problems in the present technology such as rod deformation and unsmooth open and close, prolonging the service life of the lock bottom opening mechanism, making the action more reliable and lock bottom opening more easy; furthermore, occupation space of the rotary rod in the drilling tool is small to effectively reduce the boringmud accumulation.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of end mechanism of unblanking that is used for the rotary drilling rig drilling tool.The utility model also relates to a kind of drilling tool and a kind of rotary drilling rig with this drilling tool with the above-mentioned end mechanism of unblanking.
Background technology
Rotary drilling rig is a kind of soil taking hole forming filling pile construction machinery, leans on drilling rod to drive drilling tool rotation smear metal soil, is promoted to the periodic cycle operation of unloading soil outside the hole then.When unloading boring mud outside needs, drilling tool generally realizes boring opening of the end through the end mechanism of unblanking.
Fig. 1 is existing a kind of structural representation that is used for the end mechanism of unblanking of rotary drilling rig drilling tool, and is as shown in the figure, and the rotary drilling rig drilling tool comprises brill top 1, cylindrical shell 3 and bores at the end 4; The end mechanism 2 of unblanking is installed on and bores top 1 and bore at the end 4, mainly comprises top cap 5, spring 6, drive link 7 and link up with 8 that its annexation is as shown in the figure; Drilling tool in the course of the work the most of the time be in closed condition, when unloading boring mud outside the needs, downwards by the cap 5 that bears down on one; Drive link 7 moves downward; Drive hook 8 and rotate the hanging block that bores to break away from at the end 4, bore the end 4 and under the effect of gravity, open downwards, the boring mud in the drilling tool is outwelled.
In the such scheme, the phenomenon in drilling tool can occur in the course of the work that sluice gate is not closed completely, boring mud a drops hole is after work a period of time; The drive link Deformation Member also can appear, the end mechanism of unblanking opens and closes and not wait phenomenon freely; Influence cleannes and drilling efficiency at the bottom of the hole, in addition, this end mechanism taking up room in drilling tool of unblanking is bigger; In the drilling tool that is applicable to worker China Democratic National Construction Association small pile footpath, using this end mechanism of unblanking boring mud occurs through regular meeting and is piled up near the phenomenon the end mechanism of unblanking; When particularly creeping into viscous soil horizon, boring mud is piled up and is difficult to remove, and influences rig efficient.
Therefore, how developing a kind of reliable more, technical scheme that the end of unblanking is more prone to, is the technical barrier that those skilled in the art need to be resolved hurrily.
The utility model content
In order to overcome the above-mentioned defective and the deficiency of prior art, on the one hand, the utility model provides a kind of end mechanism of unblanking that is used for drilling tool, and said drilling tool comprises and bore the top and bore at the end, and the said end mechanism of unblanking comprises the link plate on being located at the bottom of the said brill, also comprises:
Pressure lever mechanism comprises depression bar and is fixed in the briquetting on the said depression bar;
Driving mechanism comprises drive block, and an end and the said briquetting of said drive block are inconsistent, and said drive block can drive at said depression bar and move forward when said briquetting moves down;
Dwang mechanism; Comprise at least one dwang; The top of said at least one dwang is connected with the other end of said drive block; Said at least one dwang can rotate when said drive block moves forward, and the bottom of said at least one dwang is provided with hook, and said hook can be hung on said link plate or come off from said link plate by button when said at least one dwang rotate.
Preferably, the top of said pressure lever mechanism, said driving mechanism and said at least one dwang is installed on the said brill top.
Preferably, said pressure lever mechanism also comprises first spring and the top cap that is fixed in said depression bar top, and said top cap is installed on the bearing on said brill top, and said first spring is inconsistent with said top cap and said brill top respectively around said depression bar and its two ends.
Preferably, the said end mechanism of unblanking also comprises the guide pipe that is fixed on the said brill top, and said depression bar can stretch into said guide pipe and be slidingly matched with said guide pipe.
Preferably, the said end mechanism of unblanking also comprises the lower limit pipe of being located on the said brill top, and the height on the said brill of the top distance top of said lower limit pipe is less than the height on the said brill of the top distance top of said top cap.
Preferably; Said drive block is provided with the base plate inconsistent with said briquetting; Said base plate is corresponding with the shape of the inconsistent part of said briquetting; Said driving mechanism also comprises the positive stop that is fixed in said brill top, and said base plate and said positive stop are slidingly matched, said drive block can be when said briquetting drives said base plate along the direction of said positive stop qualification to front slide.
Preferably, said driving mechanism also comprises resetting means, and the two ends of said resetting means link to each other with said brill top with said drive block respectively, and said drive block can move back to initial position under the effect of said resetting means.
Preferably; Said resetting means comprises second spring, nut, be fixed in pull bar on the said drive block, be fixed in the adjustment seat board on the said brill top and pass said adjustment seat board and the adjustment screw rod through said nut check, and the two ends of said second spring link to each other with said adjustment screw rod with said pull bar respectively.
Preferably; Said at least one dwang comprises first dwang and second dwang; The top of said first dwang is fixedly connected with first spill spin block; The top of said second dwang is fixedly connected with second spill spin block, and an end of said first spill spin block is hinged through the other end of elongated hole and said drive block, is hinged with connecting rod between the end of the other end of said first spill spin block and said second spill spin block.
Preferably, be fixedly connected with handle on said first spill spin block.
Preferably, the thickness of slab direction of said hook is provided with the guiding groove, and said link plate is provided with and the corresponding flute profile mouth of the shape of said hook, and said hook can contact with said flute profile mouth collision through said guiding groove and insert in the said flute profile mouth.
Preferably, the upper limit plate at the bottom of the said end mechanism of unblanking also comprises spacing ring and is located at said brill, said at least one dwang passes said upper limit plate, and said spacing ring is fixed on the dwang between said upper limit plate and the said hook.
Preferably, said briquetting is the L type.
Preferably, the said end mechanism of unblanking also comprises and is located at the position-limiting tube that bores at the end, said at least one dwang stretch into said position-limiting tube and with said position-limiting tube matched in clearance.
On the other hand, the utility model also provides a kind of drilling tool with the above-mentioned end mechanism of unblanking.
Another aspect, the utility model also provide a kind of rotary drilling rig with above-mentioned drilling tool.
The end mechanism of unblanking that the utility model provides, have the drilling tool of this end mechanism of unblanking and rotary drilling rig, through moving up and down of pressure lever mechanism being converted into the horizontal movement of driving mechanism, the horizontal movement of driving mechanism is converted into rotatablely moving of dwang mechanism with this drilling tool; Open and close the lock action to accomplish, the load type of rod member changes moment of torsion into by pressure, has avoided the Deformation Member that possibly occur in the prior art, has opened and closed not equistability problem freely; Improved the application life of the end mechanism of unblanking; The reliable more and end of unblanking of action, be more prone to, and in addition, pushes up because pressure lever mechanism can be installed in to bore with driving mechanism; Dwang mechanism is installed on to bore pushes up and bores at the end; Load type is that the dwang of moment of torsion can adopt less diameter, thereby can reduce taking up room in the drilling tool, effectively reduces the boring mud packing phenomenon.
Description of drawings
Fig. 1 is existing a kind of structural representation that is used for the end mechanism of unblanking of rotary drilling rig drilling tool;
The structural representation of a kind of end mechanism of unblanking that Fig. 2 is provided for the utility model embodiment;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the structural representation of pressure lever mechanism among Fig. 2 and Fig. 3;
Fig. 5 is the sectional drawing of Fig. 4;
Fig. 6 is the structural representation of driving mechanism among Fig. 2 and Fig. 3;
Fig. 7 is the left view of Fig. 6;
Fig. 8 is the vertical view of Fig. 6;
Fig. 9 is the structural representation that rotates linkage among Fig. 2 and Fig. 3;
Figure 10 is the lateral view of Fig. 9;
The end mechanism of unblanking that Figure 11 is provided for the utility model embodiment is installed on the structural representation at first visual angle of drilling tool;
The end mechanism of unblanking that Figure 12 is provided for the utility model embodiment is installed on the structural representation at second visual angle of drilling tool.
The specific embodiment
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.Should be pointed out that description and description order to concrete structure in this part only are the explanations to specific embodiment, should not be regarded as that the protection domain of the utility model is had any restriction.
Combine Fig. 1 to Figure 12 that a kind of end mechanism of unblanking that is used for the Spiral digging machine drilling tool that the utility model embodiment is provided is elaborated below simultaneously.
As shown in the figure, this end mechanism 30 of unblanking comprises: be installed on the pressure lever mechanism 1 and driving mechanism 2 of boring top 28, be installed on and bore top 28 and bore the dwang mechanism 3 at the end 34, and handle 4; Its each ingredient and annexation are following:
Pressure lever mechanism 1 comprise top cap 5, through nut 9 be fixedly connected with top cap 5 with bolt 10 (also can through other fixed connection mode) depression bar 8, be fixedly connected (for example welding) in the briquetting 7 of depression bar 8 and the compression spring 6 that is installed on (near the bottom of depression bar 8) on the depression bar 8; Wherein, Top cap 5 is installed on the bearing that bores top 28; Perpendicular to boring top 28 (perhaps being in substantially parallel relationship to cylindrical shell 33), briquetting 7 is the L type to depression bar 8 substantially; The end mechanism 30 of unblanking comprises also and is fixedly installed in the guide pipe 31 that bores top 28 that said depression bar 8 can stretch in the said guide pipe 31, and is slidingly matched with said guide pipe 31 when moving downward.
Driving mechanism 2 comprises drive block 18, is fixedly connected (for example welding) base plate 15, fixed connection (for example welding) positive stop 14 and resetting means on brill top 28 in said drive block 18 tail ends; Wherein, Said base plate 15 is inconsistent with said L type briquetting 7; Positive stop 14 is used to base plate 15 and connected drive block 18 provides guiding and position-limiting action; Resetting means comprises arm-tie 17, back-moving spring 16, adjustment screw rod 11, adjustment seat board 12 and the nut 13 of fixed connection (for example welding) on drive block 18; Arm-tie 17 is provided with aperture, and adjustment seat board 12 is fixedly installed in and bores on the top 28, and an end of back-moving spring 16 is connected with arm-tie 17 through said aperture; The other end of said back-moving spring 16 is connected with adjustment seat board 12 through adjustment screw rod 11 and nut 13, can be through adjusting said adjustment screw rod 11 and nut 13 to regulate the pretightning force size of back-moving spring 16;
The inconsistent part of said base plate 15 and said L type briquetting 7 is corresponding with the L type, and base plate 15 can drive drive block 18 and move forward along the direction that positive stop 14 limits when briquetting 7 moves down; The top of first dwang and second dwang is fixedly connected with first spill spin block 19 and second spill spin block 21 respectively; One end of first spill spin block 19 is hinged through an end (being provided with fraising) of bolt and nut and connecting rod 20; One end of second spill spin block 20 is hinged through the other end (being provided with fraising) of bolt 22 and nut and connecting rod 20; The other end of first spill spin block 19 is provided with elongated hole (for example mounting hole), and the front end of drive block 18 is provided with bolt hole, and it (is that bolt 23 passes said bolt hole and said elongated hole and fixing with nut 24 that the front end of drive block 18 is connected with the other end of first spill spin block 19 through bolt 23 and nut 24; Can be considered hinged); When drive block 18 moves forward, can drive first spill spin block 19 and 21 rotations of second spill spin block, and then drive first dwang and the rotation of second dwang; It is for bolt 23 can be avoided drive block 18 to drive and occur catching phenomenon when first spill spin block 19 rotates in the activity of elongated hole internal clearance that the other end of first spill spin block 19 adopts elongated hole; Like Fig. 3 and shown in Figure 6; The centre distance of one end of one end of first spill spin block 19, second spill spin block 21, connecting rod 20 and first spill spin block 19 and second spill spin block 21 forms " parallelogram ", so can guarantee the synchronized movement of first spill spin block 19 and second spill spin block 21; Also be installed with handle 4 on first spill spin block 19.
This end mechanism 30 of unblanking also comprises the link plate 36 and upper limit plate 35 that is fixedly installed in the brill end 34; Link plate 34 is provided with and links up with 27 the corresponding flute profile mouth of shape; The height that upper limit plate 35 distances are bored the end 34 bores the height at the end 34 greater than link plate 36 distances; Dwang 25 passes upper limit plate 35, and the hook 27 of dwang 25 bottoms can contact with link plate 36 and (when hook 27 is detained in the flute profile mouth that is hung on link plate 36, bore the end 34 and close; When hook 27 breaks away from the flute profile mouth of link plate 36, bore the end 34 and open), spacing ring 26 is between link plate 36 and upper limit plate 35.
Said unlocking mechanism 30 also comprises the lower limit pipe 29 that is fixed on the brill top 28, and the top of lower limit pipe 29 is pushed up 28 height less than the top of top cap 5 apart from boring apart from the height (stroke that presses down by pressure lever mechanism 1 is decided) that bores top 28.
In the course of the work, hook 27 buttons are hung on the link plate 36, bore the end 34 and close; After completion is once crept into, unload the boring mud in the drilling tool outside needing, at this moment; Push the top cap 5 (at this moment, lower limit pipe 29 can play and press down position-limiting action, prevents to press down too much to cause pressure lever mechanism 1 stuck can't resetting) of pressure lever mechanism 1 downwards through the rotary digging drill power head platen; Briquetting 7 on the depression bar 8 moves downward drive block 18 (the comprising base plate 15) moving linearly that drives driving mechanism 2; Drive block 18 drives first spill spin block 19 and rotates, and first dwang that is connected with first spill spin block 19 also and then rotates, simultaneously since first spill spin block 19, connecting rod 20, second spill spin block 21 connect after formation " parallelogram " mechanism; The rotation synchronous under the drive of first spill spin block 19 of second spill spin block 21 with it; Second dwang that is connected with second spill spin block 21 also and then rotates synchronously, and when the hook 27 of dwang 25 bottoms turned an angle, hook 27 broke away from the link plate 36 that bores at the end 34; 34 come off at the bottom of said brill under the deadweight, accomplish and open end action; Bore after the end 34 opens, boring mud is toppled over and is finished, before beginning is crept into next time; The link plate of realizing boring through host service function 36 upwards collides hook 27 (at this moment, spacing ring 26 plays the upper limit effect with 35 pairs of dwangs 25 of upper limit plate) at the end 34, drives hook 27 rotations; Driving dwang mechanism 3 rotates together; After turning an angle, hook 27 inserts in the flute profile mouth of link plate 36, under the effect of resetting means (back-moving spring 16), drives 3 rotations of dwang mechanism with rear drive mechanism 2 and returns to initial position (at initial position; Hook 27 forms certain angle with link plate 36), finally accomplished and bored closing of the end 34.
Need to prove; The guiding groove that is provided with on the hook 27 plays the effect that drives guiding in the time of can closing at the brill end 34; Promptly when boring bottom, 34 contact stake hole, the end; Bore the link plate 34 collision hook 27 upwards at the end 34, contact drive with the collision of guiding groove through the flute profile mouth and link up with 27 and turn an angle in being inserted into the flute profile mouth.
Need to prove, when pressure lever mechanism 1 breaks down, can open or close through the artificial driving handle 4 of installing sleeve kind tool and bore at the end 34.
Need to prove; After the unit head platen leaves top cap 5; Compression spring 6 (its two ends respectively with top cap 5 with to bore top 28/ guide pipe 31 inconsistent) can under the effect of self elastic force, make pressure lever mechanism 1 retract initial position, driving mechanism 2 can be retracted initial position under the effect of returning device (back-moving spring 16).
Need to prove that the foregoing description adopts L type briquetting, but in other embodiment of the utility model, can also adopt the briquetting of other types, be converted into the plane and straight line motion of driving mechanism as long as can realize vertical motion with pressure lever mechanism.
Need to prove that the foregoing description adopts two dwangs, but in other embodiment of the utility model, one or two above dwangs can also be set as required, its implementation process is similar to the above embodiments, does not give unnecessary details now.
Need to prove; Driving mechanism 2 adopts the resetting means that comprises back-moving spring 16; But in other embodiment of the utility model, also can use the resetting means of other types as required, as long as realize that drive block can move back to initial position after moving forward.
A kind of end mechanism of unblanking that the utility model embodiment is provided, will move up and down through pressure lever mechanism is converted into the horizontal movement of driving mechanism, and the horizontal movement of driving mechanism is converted into rotatablely moving of dwang mechanism; To accomplish the switching lock action of boring the end, the load type of rod member changes moment of torsion into by pressure, and force-bearing situation obviously improves; Avoided the Deformation Member that possibly occur in the prior art, opened and closed not equistability problem freely, improved the application life of the end mechanism of unblanking, the reliable more and end of unblanking of action, be more prone to; In addition; Bore on the top because pressure lever mechanism and driving mechanism are installed in, dwang mechanism is installed on to bore and pushes up and bore at the end, and load type is that the dwang of moment of torsion can adopt less diameter; Thereby can reduce taking up room in the drilling tool; Effectively reduce the boring mud packing phenomenon, moreover the setting of various springs, position-limiting tube and guide pipe makes also the action of the end mechanism of unblanking reliable more, accurate.
The utility model embodiment also provides a kind of drilling tool and a kind of rotary drilling rig; This drilling tool has the above-mentioned end mechanism of unblanking, and this rotary drilling rig has this drilling tool, because the above-mentioned end mechanism of unblanking has above-mentioned technique effect; Therefore; The rotary drilling rig that has the drilling tool of this end mechanism of unblanking and have this drilling tool also should possess the corresponding techniques effect, and its practical implementation process is similar to the above embodiments, does not give unnecessary details now.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (16)
1. end mechanism of unblanking that is used for drilling tool, said drilling tool comprises and bores the top and bore at the end, it is characterized in that, the said end mechanism of unblanking comprises the link plate on being located at the bottom of the said brill, also comprises:
Pressure lever mechanism comprises depression bar and is fixed in the briquetting on the said depression bar;
Driving mechanism comprises drive block, and an end and the said briquetting of said drive block are inconsistent, and said drive block can drive at said depression bar and move forward when said briquetting moves downward;
Dwang mechanism; Comprise at least one dwang; The top of said at least one dwang is connected with the other end of said drive block; Said at least one dwang can rotate when said drive block moves forward, and the bottom of said at least one dwang is provided with hook, and said hook can be hung on said link plate or come off from said link plate by button when said at least one dwang rotate.
2. the end mechanism of unblanking as claimed in claim 1 is characterized in that, the top of said pressure lever mechanism, said driving mechanism and said at least one dwang is installed on the said brill top.
3. the end mechanism of unblanking as claimed in claim 2; It is characterized in that; Said pressure lever mechanism also comprises first spring and the top cap that is fixed in said depression bar top; Said top cap is installed on the bearing on said brill top, and said first spring is inconsistent with said top cap and said brill top respectively around said depression bar and its two ends.
4. the end mechanism of unblanking as claimed in claim 3 is characterized in that, the said end mechanism of unblanking also comprises the guide pipe that is fixed on the said brill top, and said depression bar can stretch into said guide pipe and be slidingly matched with said guide pipe.
5. the end mechanism of unblanking as claimed in claim 4; It is characterized in that; The said end mechanism of unblanking also comprises the lower limit pipe of being located on the said brill top, and the height on the said brill of the top distance top of said lower limit pipe is less than the height on the said brill of the top distance top of said top cap.
6. the end mechanism of unblanking as claimed in claim 2; It is characterized in that; Said drive block is provided with the base plate inconsistent with said briquetting, and said base plate is corresponding with the shape of the inconsistent part of said briquetting, and said driving mechanism also comprises the positive stop that is fixed in said brill top; Said base plate and said positive stop are slidingly matched, and the direction that said drive block can be when said briquetting drives said base plate limits along said positive stop is to front slide.
7. the end mechanism of unblanking as claimed in claim 6; It is characterized in that; Said driving mechanism also comprises resetting means, and the two ends of said resetting means link to each other with said brill top with said drive block respectively, and said drive block can move back to initial position under the effect of said resetting means.
8. the end mechanism of unblanking as claimed in claim 7; It is characterized in that; Said resetting means comprises second spring, nut, be fixed in pull bar on the said drive block, be fixed in the adjustment seat board on the said brill top and pass said adjustment seat board and the adjustment screw rod through said nut check, and the two ends of said second spring link to each other with said adjustment screw rod with said pull bar respectively.
9. the end mechanism of unblanking as claimed in claim 2; It is characterized in that; Said at least one dwang comprises first dwang and second dwang, and the top of said first dwang is fixedly connected with first spill spin block, and the top of said second dwang is fixedly connected with second spill spin block; One end of said first spill spin block is hinged through the other end of elongated hole and said drive block, is hinged with connecting rod between the end of the other end of said first spill spin block and said second spill spin block.
10. the end mechanism of unblanking as claimed in claim 9 is characterized in that, is fixedly connected with handle on said first spill spin block.
11. like each described end mechanism of unblanking of claim 1 to 10; It is characterized in that; The thickness of slab direction of said hook is provided with the guiding groove; Said link plate is provided with and the corresponding flute profile mouth of the shape of said hook, and said hook can contact with said flute profile mouth collision through said guiding groove and insert in the said flute profile mouth.
12. the end mechanism of unblanking as claimed in claim 11; It is characterized in that; The said end mechanism of unblanking also comprises the upper limit plate of being located at the bottom of the said brill; Said at least one dwang passes said upper limit plate, and said dwang mechanism also comprises spacing ring, and said spacing ring is fixed on the dwang between said upper limit plate and the said hook.
13., it is characterized in that said briquetting is the L type like each described end mechanism of unblanking of claim 1 to 10.
14., it is characterized in that the said end mechanism of unblanking also comprises and be located at the position-limiting tube that bores at the end like each described end mechanism of unblanking of claim 1 to 10, said at least one dwang stretch into said position-limiting tube and with said position-limiting tube matched in clearance.
15. a drilling tool is characterized in that, said drilling tool has each described end mechanism of unblanking of claim 1 to 14.
16. a rotary drilling rig is characterized in that, said rotary drilling rig has the described drilling tool of claim 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227857U CN202148865U (en) | 2011-06-30 | 2011-06-30 | Lock bottom opening mechanism, drilling tool and rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227857U CN202148865U (en) | 2011-06-30 | 2011-06-30 | Lock bottom opening mechanism, drilling tool and rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202148865U true CN202148865U (en) | 2012-02-22 |
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ID=45589928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120227857U Expired - Lifetime CN202148865U (en) | 2011-06-30 | 2011-06-30 | Lock bottom opening mechanism, drilling tool and rotary drilling rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202148865U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704851A (en) * | 2012-06-07 | 2012-10-03 | 三一重工股份有限公司 | Bottom expanding drill bit and rotary drilling machine |
| CN102889054A (en) * | 2012-09-29 | 2013-01-23 | 上海中联重科桩工机械有限公司 | Power head and rotary drilling rig |
-
2011
- 2011-06-30 CN CN201120227857U patent/CN202148865U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704851A (en) * | 2012-06-07 | 2012-10-03 | 三一重工股份有限公司 | Bottom expanding drill bit and rotary drilling machine |
| CN102889054A (en) * | 2012-09-29 | 2013-01-23 | 上海中联重科桩工机械有限公司 | Power head and rotary drilling rig |
| CN102889054B (en) * | 2012-09-29 | 2014-08-13 | 上海中联重科桩工机械有限公司 | Power head and rotary drilling rig |
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Granted publication date: 20120222 |
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