CN103032394B - Hydraulic system of pipe rolling device and rotary-excavating drilling machine - Google Patents
Hydraulic system of pipe rolling device and rotary-excavating drilling machine Download PDFInfo
- Publication number
- CN103032394B CN103032394B CN201210572019.4A CN201210572019A CN103032394B CN 103032394 B CN103032394 B CN 103032394B CN 201210572019 A CN201210572019 A CN 201210572019A CN 103032394 B CN103032394 B CN 103032394B
- Authority
- CN
- China
- Prior art keywords
- valve
- rolling device
- oil
- tube rolling
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a hydraulic system of a pipe rolling device and a rotary-excavating drilling machine. The hydraulic system is characterized in that an oil inlet of a main valve is connected with a hydraulic source; an oil return port is connected with an oil-return path; a first working oil port is connected with the free oil inlet end of a one-way balance valve; the free oil outlet end of the one-way balance valve is connected with a lifting oil port; a second working oil port is connected with a lowering oil port of a motor of the pipe rolling device; the hydraulic control end of the one-way balance valve is connected onto an oil path between the second working oil port and the lowering oil port; an oil inlet of a first overflowing valve is connected onto an oil path between the first working oil path and the free oil inlet end, and an overflowing port of the first overflowing valve is connected with an oil path between the second working oil port and the lowering oil port; an oil inlet of a second overflowing valve is connected onto an oil path between the free oil outlet end and the lifting oil port, and an overflowing port of the second overflowing valve is connected onto an oil path between the second working oil port and the lowering oil port. By implementation of the invention, the pipe rolling device can realize the functions of pipe rolling and pipe unrolling, and the rolled pipe can keep certain pre-tightening force.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of tube rolling device hydraulic system and rotary drilling rig.
Background technique
Reaming type rotary drilling rig installs hole expansion function additional on the basis of rotary drilling rig, and then have the stake construction equipment of reaming engineering method.Agent structure and the rotary drilling rig of reaming rig are similar, in addition also comprise main swivel coupling, rotation platform and hydraulic pressure borehole-enlarging drilling tool.Wherein, swivel coupling first rotating part and power head box are fixed together, and rotation platform is connected with the second portion of swivel coupling, and when carrying out ream operation, the second portion of rotation platform and swivel coupling rotates with drilling rod; Hydraulic pressure borehole-enlarging drilling tool is arranged at drilling rod bottom, and during ream operation, the reaming oil cylinder of hydraulic pressure reamer stretches out, thus completes ream operation.
The hydraulic oil of reaming oil cylinder from rotary digging drill power head, thus without the need to increasing extra hydraulic power unit as oil sources.From unit head hydraulic oil out after swivel coupling and rotation platform, be connected on borehole-enlarging drilling tool by hydralic hose, for reaming oil cylinder provides hydraulic oil.Rotation platform is provided with hydraulic pipe coiler, for realizing the folding and unfolding of hydralic hose.
When carrying out operation, borehole-enlarging drilling tool is transferred in the stake holes of accomplishing fluently in advance together with drilling rod, and reaming oil cylinder stretches out and carries out ream operation afterwards, is proposed to unload soil by drilling bucket, continue afterwards to transfer in hole and carry out ream operation, so move in circles after drilling bucket makes soil.Because borehole-enlarging drilling tool needs to carry out continually unloading native action, the hydralic hose be attached thereto also needs constantly to carry out folding and unfolding action, therefore, in borehole-enlarging drilling tool put-on and delegated process, hydralic hose needs to follow drilling tool to carry out action together (when drilling bucket is carried, tube rolling device need reclaim sebific duct; When drilling bucket is transferred, tube rolling device need release sebific duct), and in drilling tool put-on and delegated process, sebific duct needs to keep certain tension force, to prevent sebific duct pine disorderly, causes sebific duct to wear and tear break when ream operation.
Summary of the invention
In view of this, the present invention is intended to propose a kind of tube rolling device hydraulic system and rotary drilling rig, enables tube rolling device automatically realize closed tube along with the lifting of drilling rod and put pipe function, and makes the pre-tensioning that pipe crimping keeps certain.
On the one hand, tube rolling device hydraulic system of the present invention comprises tube rolling device motor, main valve, one-way balance valve, the first relief valve and the second relief valve; The filler opening of described main valve is connected to hydraulic power, the return opening of described main valve is connected to oil return circuit, first actuator port of described main valve is connected to the free oil inlet end of described one-way balance valve, the free oil outlet end of described one-way balance valve be connected to described tube rolling device motor on carry hydraulic fluid port, second actuator port of described main valve is connected to the lower fuel outlet of described tube rolling device motor, and the hydraulic control of described one-way balance valve is terminated on the oil circuit between described second actuator port and described lower fuel outlet; The filler opening of described first relief valve is connected on the oil circuit between described first actuator port and described free oil inlet end, and the flow-off of described first relief valve is connected on the oil circuit between described second actuator port and described lower fuel outlet; The filler opening of described second relief valve be connected to described free oil outlet end and described on carry between hydraulic fluid port oil circuit on, the flow-off of described second relief valve is connected on the oil circuit between described second actuator port and described lower fuel outlet.
Further, described tube rolling device motor comprises the first tube rolling device motor and the second tube rolling device motor.
Further, described tube rolling device hydraulic system also comprises the 3rd relief valve, the filler opening of described 3rd relief valve is connected on the oil circuit between described second actuator port and described lower fuel outlet, and the flow-off of described 3rd relief valve is connected on the oil circuit between described first actuator port and described free oil inlet end.
Further, described main valve at least has two kinds of working staties, under the first working state, the filler opening of described main valve communicates with the first actuator port, the return opening of described main valve communicates with the second actuator port, under the second working state, the filler opening of described main valve communicates with the second actuator port, and the return opening of described main valve communicates with the first actuator port.
Further, each valve is integrated on same valve block.
Further, described tube rolling device hydraulic system also comprises the first switch valve, described first switch valve is Normally closed type, first hydraulic fluid port of described first switch valve be connected to described free oil outlet end and described on carry between hydraulic fluid port oil circuit on, second hydraulic fluid port of described first switch valve is connected to the filler opening of described second relief valve, the hydraulic control of described first switch valve be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on.
Further, described tube rolling device hydraulic system also comprises second switch valve, described second switch valve is Normally closed type, first hydraulic fluid port of described second switch valve is connected on the oil circuit between described free oil inlet end and described first actuator port, second hydraulic fluid port of described second switch valve is connected on the oil circuit between described second actuator port and described lower fuel outlet, the hydraulic control of described second switch valve be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on.
On the other hand, rotary drilling rig provided by the invention is provided with the tube rolling device hydraulic system described in above-mentioned any one.
Tube rolling device hydraulic system provided by the invention can make tube rolling device carry out automatic deploying and retracting to sebific duct, realize borehole-enlarging drilling tool upper carry can to follow with hydralic hose in the process transferred to carry out together with drilling tool action (when namely drilling bucket being carried, tube rolling device the automatic recovery sebific duct; When drilling bucket is transferred, tube rolling device releases sebific duct automatically), and this pipe crimping hydraulic system can make sebific duct keep certain pre-tensioning in the lifting process of drilling tool.
Rotary drilling rig of the present invention is provided with above-mentioned tube rolling device hydraulic system, and because above-mentioned tube rolling device hydraulic system has above-mentioned technique effect, therefore, this tube rolling device hydraulic system also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The principle schematic of a kind of tube rolling device hydraulic system that Fig. 1 provides for the embodiment of the present invention;
Primary component symbol description:
1 first tube rolling device motor
2 second tube rolling device motors
3 first switch valves
4 one-way balance valves
5 second switch valves
6 first relief valves
7 main valves
8 the 3rd relief valves
9 second relief valves
Embodiment
To it should be pointed out that in this part to the description of concrete structure and description order it is only explanation to specific embodiment, should not be considered as there is any restriction to protection scope of the present invention.In addition, when not conflicting, the embodiment in this part and the feature in embodiment can combine mutually.
Please refer to Fig. 1, below in conjunction with embodiment, the present invention is elaborated.
As shown in Figure 1, the tube rolling device hydraulic system of this embodiment comprises tube rolling device motor, main valve 7, one-way balance valve 4, first relief valve 6, second relief valve 9, the 3rd relief valve 8, first switch valve 3 and second switch valve 5.
Wherein, tube rolling device motor comprises the first tube rolling device motor 1 and the second tube rolling device motor 2; The filler opening of main valve 7 is connected to hydraulic power, the return opening of main valve 7 is connected to oil return circuit, first actuator port of main valve 7 is connected to the free oil inlet end of one-way balance valve 4, the free oil outlet end of one-way balance valve 4 be connected to two tube rolling device motors on carry hydraulic fluid port, second actuator port of main valve 7 is connected to the lower fuel outlet of two tube rolling device motors, and the hydraulic control of one-way balance valve 4 is terminated on the oil circuit between described second actuator port and lower fuel outlet.
Main valve 7 has at least two kinds of working staties, under the first working state, the filler opening of main valve 7 communicates with the first actuator port, the return opening of main valve 7 communicates with the second actuator port, under the second working state, the filler opening of main valve 7 communicates with the second actuator port, and the return opening of main valve 7 communicates with the first actuator port.
The filler opening of the first relief valve 6 is connected on the oil circuit between described first actuator port and described free oil inlet end, and the flow-off of the first relief valve 6 is connected on the oil circuit between described second actuator port and described lower fuel outlet; The filler opening of the 3rd relief valve 8 is connected on the oil circuit between described second actuator port and described lower fuel outlet, and the flow-off of the 3rd relief valve 8 is connected on the oil circuit between described first actuator port and described free oil inlet end.
First switch valve 3 is Normally closed type, first hydraulic fluid port of the first switch valve 3 be connected to described free oil outlet end and described on carry between hydraulic fluid port oil circuit on, second hydraulic fluid port of the first switch valve 3 is connected to the filler opening of the second relief valve 9, the hydraulic control of the first switch valve 3 be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on; The flow-off of the second relief valve 9 is connected on the oil circuit between described second actuator port and described lower fuel outlet.
Second switch valve 5 is Normally closed type, first hydraulic fluid port of second switch valve 5 is connected on the oil circuit between described free oil inlet end and described first actuator port, second hydraulic fluid port of second switch valve 5 is connected on the oil circuit between described second actuator port and described lower fuel outlet, the hydraulic control of second switch valve 5 be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on.
In specific implementation process, the first tube rolling device and the second tube rolling device are fixedly installed on the rotation platform of reaming type rotary drilling rig, and the first tube rolling device motor 1 and the second tube rolling device motor 2 drive with the first tube rolling device and the second tube rolling device respectively and be connected; First sebific duct is wound on the first tube rolling device, its folding and unfolding end is connected to the rodless cavity of the reaming oil cylinder in borehole-enlarging drilling tool by drilling rod, second sebific duct is wound on the second tube rolling device, its folding and unfolding end is connected to the rod chamber of the reaming oil cylinder in borehole-enlarging drilling tool by drilling rod, when the hydraulic oil carrying out unit head is optionally for this rodless cavity or rod chamber fuel feeding, reaming oil cylinder can realize stretching out or retracting, to realize ream operation.
The working principle of above-described embodiment is described below in conjunction with specific works scene:
1, be in work progress at expansion subdrilling machine, when start attonity or master winch are carried, main valve 7 is operated in the first working state, the pressure oil of hydraulic power enters from the filler opening of main valve 7, after one-way balance valve 4, act on two tube rolling device motors on carry hydraulic fluid port, drive on two tube rolling device motors and carry sebific duct, now, first switch valve 3 and second switch valve 5 are for closed condition, first relief valve 6 is in overflow situation, therefore, tube rolling device drives sebific duct to keep tensioning, under this situation, the large I of pre-tensioning of sebific duct is set by the cracking pressure of the first relief valve 6.
2, when master winch is transferred, sebific duct on two tube rolling devices is driven descending, drive two tube rolling device runnings, the passive rotation of two tube rolling device motors, the oil circuit pressure two tube rolling device motors carried between hydraulic fluid port and the free oil outlet end of one-way balance valve 4 raises, and then opens the first switch valve 3 and second switch valve 5; The pressure oil of hydraulic power enters from the filler opening of main valve 7, and by second switch valve 5 off-load; And two tube rolling device motors are carried hydraulic fluid port export hydraulic oil by getting back to the lower fuel outlet of two tube rolling device motors or get back to oil return circuit after the first switch valve 3 and the second relief valve 9, second relief valve 9 can ensure that the sebific duct being wound in two tube rolling device motors keeps tensioning in passive rotary course, under this situation, the large I of pre-tensioning of sebific duct is set by the cracking pressure of the second relief valve 9.
3, unloading under pipe die formula fast, main valve 7 is operated in the second working state, after the pressure oil of hydraulic power enters from the filler opening of main valve 7, what act directly on two tube rolling device motors transfers mouth, two tube rolling device motors are driven to transfer sebific duct, this pressure oil also opens one-way balance valve 4 by the hydraulic control end of one-way balance valve 4, make two tube rolling device motors on carry hydraulic fluid port export hydraulic oil get back to oil return circuit through one-way balance valve 4; In this process, the maximum pressure of tubulose state is unloaded in the 3rd relief valve 8 restriction, and in this case, the large I of pretightening force of sebific duct is set by the 3rd relief valve 8.
In above-described embodiment, preferably, the cracking pressure of the second relief valve 9 is greater than the cracking pressure of the first switch valve 3; In addition, preferably, the first relief valve 6 is identical with the cracking pressure of the second relief valve 9, can ensure that sebific duct is to raise and decentralize the pretightening force size variation in process little like this.
In above-described embodiment, preferably, as shown in the figure, each valve is integrated in same valve block, this valve block forms the oil-collecting holes such as P, T, A1, A2, B1, B2, MA, MB and MP, and wherein, MA, MB and MP are as pressure measurement hydraulic fluid port, the mode of communicating of each hydraulic fluid port can be shown in Figure 1, can reduce the complexity of line arrangement like this.
In above-described embodiment, preferably, the first switch valve 3 and second switch valve 5 adopt 2/2-way valve, and main valve 7 adopts 2/2-way solenoid valve; But in other embodiments, be not limited thereto, as long as above-mentioned corresponding function can be realized.In addition, in other embodiments, if the cracking pressure of the first relief valve 6 and the second relief valve 9 can meet use needs, also can omit the first switch valve 3 and second switch valve 5 as required, and the filler opening of the second relief valve 9 is connected on the oil circuit carried between hydraulic fluid port and the free oil outlet end of one-way balance valve 4.
From the foregoing, the tube rolling device hydraulic system of the embodiment of the present invention can realize the automatic deploying and retracting to sebific duct, makes borehole-enlarging drilling tool carry with the process transferred upper, sebific duct can follow drilling tool carry out together action (when drilling bucket is carried, tube rolling device the automatic recovery sebific duct; When drilling bucket is transferred, tube rolling device releases sebific duct automatically); In addition, sebific duct can also be made in the lifting process of borehole-enlarging drilling tool to realize automatic tensioning function, and keep certain pre-tensioning; In addition, also having and unload pipe die formula fast, making tube rolling device have the function of quickly retracting sebific duct when removing and installing sebific duct.
The embodiment of the present invention additionally provides a kind of rotary drilling rig, reaming rig is dug as revolved, this rotary drilling rig is provided with the tube rolling device hydraulic system described in above-described embodiment, because above-mentioned tube rolling device hydraulic system has above-mentioned technique effect, therefore, this rotary drilling rig also should possess corresponding technique effect, and the specific implementation process of its appropriate section is similar to the above embodiments, the specific implementation process of other parts see the associated description of prior art, hereby can not repeat.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a tube rolling device hydraulic system, is characterized in that:
Described tube rolling device hydraulic system comprises tube rolling device motor, main valve (7), one-way balance valve (4), the first relief valve (6) and the second relief valve (9);
The filler opening of described main valve (7) is connected to hydraulic power, the return opening of described main valve (7) is connected to oil return circuit, first actuator port of described main valve (7) is connected to the free oil inlet end of described one-way balance valve (4), the free oil outlet end of described one-way balance valve (4) be connected to described tube rolling device motor on carry hydraulic fluid port, second actuator port of described main valve (7) is connected to the lower fuel outlet of described tube rolling device motor, and the hydraulic control of described one-way balance valve (4) is terminated on the oil circuit between described second actuator port and described lower fuel outlet;
The filler opening of described first relief valve (6) is connected on the oil circuit between described first actuator port and described free oil inlet end, and the flow-off of described first relief valve (6) is connected on the oil circuit between described second actuator port and described lower fuel outlet;
The filler opening of described second relief valve (9) be connected to described free oil outlet end and described on carry between hydraulic fluid port oil circuit on, the flow-off of described second relief valve (9) is connected on the oil circuit between described second actuator port and described lower fuel outlet;
Described tube rolling device hydraulic system also comprises second switch valve (5), described second switch valve (5) is Normally closed type, first hydraulic fluid port of described second switch valve (5) is connected on the oil circuit between described free oil inlet end and described first actuator port, second hydraulic fluid port of described second switch valve (5) is connected on the oil circuit between described second actuator port and described lower fuel outlet, the hydraulic control of described second switch valve (5) be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on.
2. tube rolling device hydraulic system as claimed in claim 1, is characterized in that: described tube rolling device motor comprises the first tube rolling device motor (1) and the second tube rolling device motor (2).
3. tube rolling device hydraulic system as claimed in claim 1, it is characterized in that: described tube rolling device hydraulic system also comprises the 3rd relief valve (8), the filler opening of described 3rd relief valve (8) is connected on the oil circuit between described second actuator port and described lower fuel outlet, and the flow-off of described 3rd relief valve (8) is connected on the oil circuit between described first actuator port and described free oil inlet end.
4. tube rolling device hydraulic system as claimed in claim 1, it is characterized in that: described main valve (7) at least has two kinds of working staties, under the first working state, the filler opening of described main valve (7) communicates with the first actuator port, the return opening of described main valve (7) communicates with the second actuator port, under the second working state, the filler opening of described main valve (7) communicates with the second actuator port, and the return opening of described main valve (7) communicates with the first actuator port.
5. tube rolling device hydraulic system as claimed in claim 1, is characterized in that: each valve is integrated on same valve block.
6. tube rolling device hydraulic system as described in any one of claim 1 to 5, it is characterized in that: described tube rolling device hydraulic system also comprises the first switch valve (3), described first switch valve (3) is Normally closed type, first hydraulic fluid port of described first switch valve (3) be connected to described free oil outlet end and described on carry between hydraulic fluid port oil circuit on, second hydraulic fluid port of described first switch valve (3) is connected to the filler opening of described second relief valve (9), the hydraulic control of described first switch valve (3) be terminated at described free oil outlet end and described on carry between hydraulic fluid port oil circuit on.
7. a rotary drilling rig, is characterized in that: described rotary drilling rig is provided with the tube rolling device hydraulic system described in any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210572019.4A CN103032394B (en) | 2012-12-26 | 2012-12-26 | Hydraulic system of pipe rolling device and rotary-excavating drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210572019.4A CN103032394B (en) | 2012-12-26 | 2012-12-26 | Hydraulic system of pipe rolling device and rotary-excavating drilling machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103032394A CN103032394A (en) | 2013-04-10 |
| CN103032394B true CN103032394B (en) | 2015-05-13 |
Family
ID=48019651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210572019.4A Active CN103032394B (en) | 2012-12-26 | 2012-12-26 | Hydraulic system of pipe rolling device and rotary-excavating drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103032394B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3589387A (en) * | 1969-08-22 | 1971-06-29 | Int Basic Economy Corp | Integrated manifold circuits and method of assembly |
| JPS55166507A (en) * | 1979-06-15 | 1980-12-25 | Hitachi Constr Mach Co Ltd | Circuit for hydraulically movable device |
| CN102153027A (en) * | 2011-04-12 | 2011-08-17 | 武汉船用机械有限责任公司 | Stepless regulation constant tension device for hydraulic winch |
| CN102269199A (en) * | 2011-07-13 | 2011-12-07 | 武汉船用机械有限责任公司 | Bidirectional three-speed motor controller |
| CN102425578A (en) * | 2011-11-24 | 2012-04-25 | 武汉船用机械有限责任公司 | Novel double-motor serial-parallel automatic switching device |
| CN102659049A (en) * | 2012-05-07 | 2012-09-12 | 三一汽车起重机械有限公司 | Dual-winch hydraulic control system and engineering machine |
| CN203067376U (en) * | 2012-12-26 | 2013-07-17 | 三一重工股份有限公司 | Hydraulic system of pipe rolling device and rotary drilling machine |
-
2012
- 2012-12-26 CN CN201210572019.4A patent/CN103032394B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3589387A (en) * | 1969-08-22 | 1971-06-29 | Int Basic Economy Corp | Integrated manifold circuits and method of assembly |
| JPS55166507A (en) * | 1979-06-15 | 1980-12-25 | Hitachi Constr Mach Co Ltd | Circuit for hydraulically movable device |
| CN102153027A (en) * | 2011-04-12 | 2011-08-17 | 武汉船用机械有限责任公司 | Stepless regulation constant tension device for hydraulic winch |
| CN102269199A (en) * | 2011-07-13 | 2011-12-07 | 武汉船用机械有限责任公司 | Bidirectional three-speed motor controller |
| CN102425578A (en) * | 2011-11-24 | 2012-04-25 | 武汉船用机械有限责任公司 | Novel double-motor serial-parallel automatic switching device |
| CN102659049A (en) * | 2012-05-07 | 2012-09-12 | 三一汽车起重机械有限公司 | Dual-winch hydraulic control system and engineering machine |
| CN203067376U (en) * | 2012-12-26 | 2013-07-17 | 三一重工股份有限公司 | Hydraulic system of pipe rolling device and rotary drilling machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103032394A (en) | 2013-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2009510358A (en) | Hydraulic device for recovering potential energy | |
| CN110242629A (en) | The method of hydraulic system and control hydraulic actuator | |
| US20110278068A1 (en) | Regenerative drive mechanism for hydraulic feed cylinders in hydrostatic or hydraulic circuits | |
| CN106257991A (en) | There is the implement system of hydraulic starting auxiliary | |
| JP4693730B2 (en) | Circulation type drilling rig | |
| CN203067376U (en) | Hydraulic system of pipe rolling device and rotary drilling machine | |
| US20190178041A1 (en) | Hydraulic Multi-Displacement Hoisting Cylinder System | |
| CN103032394B (en) | Hydraulic system of pipe rolling device and rotary-excavating drilling machine | |
| CA3037474C (en) | Downhole tractor comprising two or more hydraulic supply lines | |
| US8584453B2 (en) | Hydrostatic circuit lock valve components, circuits, systems, and method | |
| AU2017204054B2 (en) | Device for recovering hydraulic energy by connecting two differential cylinders | |
| JP6282127B2 (en) | hydraulic unit | |
| KR100724072B1 (en) | Device for hydraulic power supply of a rotary apparatus for percussive drilling | |
| CN106381873A (en) | Hydraulic drive mud pipe rotating disc device | |
| KR20010113729A (en) | Drill for making wide diameter and high depth holes and method for carrying out said holes | |
| CN106854880A (en) | Rig in excavator arm with quartering hammer | |
| JP5462664B2 (en) | Hydraulic motor drive device | |
| CN206521780U (en) | Rig in excavator arm with quartering hammer | |
| GB2457288A (en) | A drillstring connection valve | |
| CN218716640U (en) | Bypass valve, drilling tool and petroleum machinery | |
| JP6210825B2 (en) | Power transmission device | |
| CN103321571A (en) | Rotary drilling rig | |
| CN104822950A (en) | Hydraulic circuit for construction machine | |
| CN106854879A (en) | There is the rig on the excavator of quartering hammer | |
| KR20180110800A (en) | Energy-revival type hydraulic aparatus and construction equipment using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |