CN202090905U - Hydraulic control system for rotating system of horizontal directional drilling machine - Google Patents
Hydraulic control system for rotating system of horizontal directional drilling machine Download PDFInfo
- Publication number
- CN202090905U CN202090905U CN2011201709623U CN201120170962U CN202090905U CN 202090905 U CN202090905 U CN 202090905U CN 2011201709623 U CN2011201709623 U CN 2011201709623U CN 201120170962 U CN201120170962 U CN 201120170962U CN 202090905 U CN202090905 U CN 202090905U
- Authority
- CN
- China
- Prior art keywords
- valve
- oil circuit
- fluid port
- hydraulic fluid
- hydraulic
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model provides a hydraulic control system for a rotating system of a horizontal directional drilling machine and relates to the hydraulic control system of the horizontal directional drilling machine. The hydraulic control system for the rotating system of the horizontal directional drilling machine comprises a main pump, a main control valve, a two-speed valve device and a power head assembly, wherein the two-speed valve device comprises a two-way cartridge inserted valve I, a two-way cartridge inserted valve II, a control cover plate I, a control cover plate II, a solenoid directional valve and a shuttle valve. Through the shuttle valve, a pressure signal of the oil channel with higher pressure in an oil channel I and an oil channel II is led into the solenoid directional valve, through the different positions of the solenoid directional valve, the pressure signal is selectively led into a control cavity of the two-way cartridge inserted valve I or the two-way cartridge inserted valve II, the two-way cartridge inserted valve with the pressure signal is under the closed state, and the two-way cartridge inserted valve without the pressure signal is under the open state, so that the oil channel II is selectively connected with the oil channel I or an oil channel III to achieve different connection modes of the oil channels, the purpose that the flow rate of the main pump can only supply a hydraulic motor I or supply the hydraulic motor I and a hydraulic motor II at the same time is achieved finally, and the changing-over of high gear and low gear of the drilling machine is realized.
Description
Technical field
The utility model relates to a kind of hydraulic control system of horizontal directional drilling machine, particularly a kind of hydraulic control system of horizontal directional drilling machine rotary system.
Background technology
Adopt the horizontal directional drilling machine of hydraulic system with constant displacement pump, the revolution of its unit head is generally by several hydraulic motors drive speed reducer together, and by the reductor outputting power.By different hydraulic circuit mode of communicating, can realize at a high speed and two gears of low speed that top gear is realized high speed low torque, low or first gear is realized low-speed big.Generally be commutation, realize the afflux and the shunting mode of different hydraulic circuits, reach several hydraulic motor serial or parallel connection relations, realize the switching of high low or first gear by manual guiding valve.As shown in Figure 1, a unit head one has two hydraulic motor participation work, and when the flow of main pump only offers a hydraulic motor, the another one hydraulic motor is in the passive rotation state, so at this time have only a hydraulic motor that power is provided, the revolution of unit head is a top gear; By manual guiding valve 12, with the switching of oil circuit, the flow of main pump 1 offers two hydraulic motors that belong to relation in parallel respectively, so at this time there are two hydraulic motors that power is provided, a hydraulic motor just changes, another hydraulic motor counter-rotating, and the revolution of unit head is a bottom gear.
The hydraulic system of the unit head main pumps that adopt big discharge capacity more, if adopt commutation to realize different afflux and the shunting modes of hydraulic circuit by manual guiding valve, can produce the excessive pressure loss at the manual oil port of guiding valve, cause being short of power or hydraulic motor is inhaled phenomenons such as sky.
The utility model content
The technical problems to be solved in the utility model is: provide a kind of simple in structure, easy to operate, reliable operation, the pressure loss low, can realize the horizontal directional drilling machine rotary system hydraulic control system that the high low or first gear of horizontal directional drilling machine unit head switches, to solve above-mentioned prior art problem.
The technical scheme that the utility model adopts for achieving the above object is: a kind of horizontal directional drilling machine rotary system hydraulic control system, comprise main pump, main control valve, the double speed valve gear, the unit head assembly, the unit head assembly mainly comprises the hydraulic motor I, hydraulic motor II and reductor assembly, be connected by the oil circuit I between hydraulic fluid port of hydraulic motor I and main control valve, another hydraulic fluid port of hydraulic motor I connects the oil circuit II, be connected by the oil circuit III between hydraulic fluid port of hydraulic motor II and main control valve, another hydraulic fluid port of hydraulic motor II is connected in the oil circuit I by the oil circuit IV, the double speed valve gear is connected in the oil circuit I, between oil circuit II and oil circuit III, the double speed valve gear comprises the two-way plug-in valve I, the two-way plug-in valve II, the control cover plate I, the control cover plate II, solenoid operated directional valve and shuttle valve, the control cover plate I, the control cover plate II is separately positioned on the two-way plug-in valve I, on the two-way plug-in valve II, shuttle valve is connected to the oil circuit I, also can be between oil circuit III and solenoid operated directional valve with the oil circuit I, the pressure signal of the oil circuit that pressure is big in the oil circuit III is introduced the P hydraulic fluid port of described solenoid operated directional valve, the A of solenoid operated directional valve, the B hydraulic fluid port respectively with described two-way plug-in valve II, the C hydraulic fluid port of two-way plug-in valve I links to each other, the A hydraulic fluid port of two-way plug-in valve I links to each other with the oil circuit I, the A hydraulic fluid port of two-way plug-in valve II links to each other with the oil circuit III, the B hydraulic fluid port of two-way plug-in valve I links to each other with the B hydraulic fluid port of two-way plug-in valve II, and the B hydraulic fluid port of two-way plug-in valve I links to each other with the oil circuit II with the B hydraulic fluid port of two-way plug-in valve II simultaneously.
Further technical scheme of the present utility model is: described electromagnetic valve reversal valve is two four-way electromagnetic reversing valves.
Further again technical scheme of the present utility model is: described shuttle valve is installed in the control cover plate I.
Further technical scheme of the present utility model is: described main control valve is provided with the system oil return pipeline that links to each other with the fuel tank of hydraulic control system, is connected with counterbalance valve on the system oil return pipeline.
The horizontal directional drilling machine rotary system hydraulic control system of the utility model has following beneficial effect:
1. used element major part is standard component, and is simple in structure, cost is low, versatility good
The double speed valve gear of the utility model horizontal directional drilling machine rotary system hydraulic control system adopts two-way plug-in valve, solenoid operated directional valve and shuttle valve, these elements are standard component, overall structure is simple, cost is low, two-way plug-in valve has the advantages that nominal flow rate is big, the pressure loss was little when fluid was flowed through, spool is active in one's movements, anti-blockage capability is strong, versatility is good, can effectively solve to be short of power or the empty problem of hydraulic motor suction.
2. adopt solenoid operated directional valve to switch high low or first gear, easy to operate
The utility model horizontal directional drilling machine rotary system hydraulic control system adopts solenoid operated directional valve to switch high low or first gear, and the change-over switch of directly pressing solenoid operated directional valve when switching high low or first gear gets final product, and need not by pull manual guiding valve with hand, and it is very convenient to operate.
Below in conjunction with drawings and Examples the utility model horizontal directional drilling machine rotary system hydraulic control system is further described.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of prior art horizontal directional drilling machine rotary system hydraulic control system.
Fig. 2 is the hydraulic schematic diagram of the utility model horizontal directional drilling machine rotary system hydraulic control system.
The critical element label declaration:
1-main pump, 2-main control valve, 3-double speed valve gear, 31-two-way plug-in valve II, 32-control cover plate II, 33-solenoid operated directional valve, 34-control cover plate I, 35-shuttle valve, 36-two-way plug-in valve I, 4-oil circuit III, 5-unit head assembly, 51-hydraulic motor II, 52-reductor assembly, 521-output gear, 522-input gear, 53-hydraulic motor I, 6-oil circuit II, 7-oil circuit I, 8-system oil return pipeline, 9-fuel tank, 10-double speed valve oil return pipe, 11-counterbalance valve, 12-manually guiding valves, 13-oil circuit IV.
The specific embodiment
As shown in Figure 2, the utility model horizontal directional drilling machine rotary system hydraulic control system comprises main pump 1, main control valve 2, double speed valve gear, unit head assembly 5.(for the hydraulic fluid port or the oil circuit of each element of difference all adds numeral in the present embodiment in order to difference in the code name back of corresponding hydraulic fluid port or oil circuit.）
2 of hydraulic fluid port A4 of hydraulic motor I 53 and main control valves are connected by oil circuit I 7, another hydraulic fluid port B4 of hydraulic motor I 53 connects oil circuit II 6,2 of hydraulic fluid port A3 of hydraulic motor II 51 and main control valves are connected by oil circuit III 4, another hydraulic fluid port B3 of hydraulic motor II 51 is connected in oil circuit I 7 by oil circuit IV 13, and the double speed valve gear is connected in 4 of oil circuit I 7, oil circuit II 6 and oil circuit III.
Described double speed valve gear comprises two-way plug-in valve I 36, two-way plug-in valve II 31, control cover plate I 34, control cover plate II 32, solenoid operated directional valve 33 and shuttle valve 35.Control cover plate I 34, control cover plate II 32 are separately positioned on two-way plug-in valve I 36, the two-way plug-in valve II 31.Shuttle valve 35 is installed in the control cover plate I 34, shuttle valve 35 is connected to oil circuit I 7,33 of oil circuit III 4 and solenoid operated directional valves also can be with oil circuit I 7, the pressure signal of the oil circuit that pressure is big in the oil circuit III 4 is introduced the P hydraulic fluid port of described solenoid operated directional valve 33, electromagnetic valve reversal valve 33 is two four-way electromagnetic reversing valves, the A5 of solenoid operated directional valve 33, the B5 hydraulic fluid port respectively with described two-way plug-in valve II 31, the C1 of two-way plug-in valve I 36, C2 hydraulic fluid port link to each other (wherein solenoid operated directional valve with link to each other with the C hydraulic fluid port of two-way plug-in valve after oil pipe between two two-way plug-in valves passes control cover plate respectively), the A2 hydraulic fluid port of two-way plug-in valve I 36 links to each other with oil circuit I 7, the A1 hydraulic fluid port of two-way plug-in valve II 31 links to each other with oil circuit III 4, the B2 hydraulic fluid port of two-way plug-in valve I 36 links to each other with the B1 hydraulic fluid port of two-way plug-in valve II 31, and the B2 hydraulic fluid port of two-way plug-in valve I 36 links to each other with oil circuit II 6 with the B1 hydraulic fluid port of two-way plug-in valve II 31 simultaneously.
Described main control valve 2 is provided with the system oil return pipeline 8 that links to each other with the fuel tank 9 of hydraulic control system, is connected with counterbalance valve 11 on system oil return pipeline 8.
The effect of main control valve 2 is that the flow of control main pump 1 is selected to enter oil circuit I 7 or oil circuit III 4, and carries out flow-control.The effect of double speed valve gear 3 is to make oil circuit II 6 select to be communicated with oil circuit I 7 or oil circuit III 4.Solenoid operated directional valve 33 is used to switch high low or first gear.If hydraulic motor A hydraulic fluid port oil-feed B hydraulic fluid port is fuel-displaced for just changeing, B hydraulic fluid port oil-feed A hydraulic fluid port is fuel-displaced for reversing.
As shown in Figure 2, when main control valve 2 is in right position, when solenoid operated directional valve 33 is in the work of right position, oil circuit I 7 is an in-line, oil circuit III 4 is an oil return line, at this moment the pressure of oil circuit I 7 is greater than the pressure of oil circuit III 4, the pressure signal of oil circuit I 7 enters the P5 hydraulic fluid port of solenoid operated directional valve 33 by shuttle valve 35, enter control cover plate II 32 by the A5 hydraulic fluid port again, enter the control chamber of two-way plug-in valve II 31 at last by the C1 hydraulic fluid port of two-way plug-in valve II 31, the A1 of two-way plug-in valve II 31 is to the locking of B1 oil circuit, the hydraulic oil of the control chamber of two-way plug-in valve I 36 enters the B5 hydraulic fluid port of solenoid operated directional valve by control cover plate I 34, pass through the oil return inlet T 5 of solenoid operated directional valve 33 again, enter fuel tank 9 by double speed valve oil return pipe 10 at last, the A2 of two-way plug-in valve I 36 opens to the B2 oil circuit, oil circuit II 6 is communicated with oil circuit I 7, be the A4 of hydraulic motor I 53, the B4 hydraulic fluid port all links to each other with oil circuit I 7, does not have pressure reduction between two hydraulic fluid ports, does not provide power to reductor.The hydraulic fluid port A3 of hydraulic motor II 51 links to each other, is the low pressure hydraulic fluid port with oil circuit III 4, hydraulic fluid port B3 links to each other with oil circuit I 7, is the high pressure hydraulic fluid port by oil circuit IV 13, the flow of main pump 1 all enters hydraulic motor II 51, hydraulic motor II 51 drives 522 counter-rotatings of input gear, and input gear 522 drives hydraulic motor I 53 again and output gear 521 carries out high speed rotating, and hydraulic motor I 53 is just being changeed at this moment, the oil suction of A4 hydraulic fluid port, the oil extraction of B4 hydraulic fluid port, two hydraulic fluid ports are the high pressure hydraulic fluid port, do not exist to inhale empty danger; When main control valve 2 is in right position, when solenoid operated directional valve 33 is in the work of position, a left side, oil circuit I 7 is an in-line, oil circuit III 4 is an oil return line, at this moment the pressure of oil circuit I 7 is also greater than the pressure of oil circuit III 4, the pressure signal of oil circuit I 7 enters the P5 hydraulic fluid port of solenoid operated directional valve 33 by shuttle valve 35, enter control cover plate I 34 by the B5 hydraulic fluid port again, enter the control chamber of two-way plug-in valve I 36 at last by the C2 hydraulic fluid port of two-way plug-in valve I 36, the A2 of two-way plug-in valve I 36 is to the locking of B2 oil circuit, the hydraulic oil of two-way plug-in valve II 31 control chambers passes the A5 hydraulic fluid port that control cover plate II 32 enters solenoid operated directional valve by the C1 hydraulic fluid port, pass through the oil return inlet T 5 of solenoid operated directional valve again, and enter fuel tank 9 by double speed valve oil return pipe 10, the A1 of two-way plug-in valve II 31 opens to the B1 oil circuit, oil circuit II 6 is communicated with oil circuit III 4, the A4 hydraulic fluid port that is hydraulic motor I 53 links to each other with oil circuit I 7, be the high pressure hydraulic fluid port, the B4 hydraulic fluid port links to each other with oil circuit III 4 by oil circuit II 6, be the low pressure hydraulic fluid port, the A3 hydraulic fluid port of hydraulic motor II 51 links to each other with oil circuit III 4, be the low pressure hydraulic fluid port, the B3 hydraulic fluid port links to each other with oil circuit I 7, be the high pressure hydraulic fluid port, the flow of main pump 1 enters hydraulic motor II 51 simultaneously, hydraulic motor I 53,51 counter-rotatings of hydraulic motor II, hydraulic motor I 53 is just being changeed, hydraulic motor II 51, hydraulic motor I 53 drives input gear 522 simultaneously, and input gear 522 drives output gear 521 again and carries out low speed rotation.
When main control valve 2 is in position, a left side, when solenoid operated directional valve 33 is in the work of right position, oil circuit III 4 is an in-line, oil circuit I 7 is an oil return line, at this moment the pressure of oil circuit III 4 is greater than the pressure of oil circuit I 7, the pressure signal of oil circuit III 4 enters the P5 hydraulic fluid port of solenoid operated directional valve 33 by shuttle valve 35, enter control cover plate II 32 by the A5 hydraulic fluid port again, enter the control chamber of two-way plug-in valve II 31 at last by the C1 hydraulic fluid port of two-way plug-in valve II 31, the A1 of two-way plug-in valve II 31 is to the locking of B1 oil circuit, the hydraulic oil of the control chamber of two-way plug-in valve I 36 enters the B5 hydraulic fluid port of solenoid operated directional valve by control cover plate I 34, pass through the oil return inlet T 5 of solenoid operated directional valve again, enter fuel tank 9 by double speed valve oil return pipe 10 at last, the A2 of two-way plug-in valve I 36 opens to the B2 oil circuit, and oil circuit II 6 is communicated with oil circuit I 7, i.e. the A4 of hydraulic motor I 53, the B4 hydraulic fluid port all links to each other with oil circuit I 7, do not have pressure reduction between two hydraulic fluid ports, do not provide power reductor.The hydraulic fluid port A3 of hydraulic motor II 51 links to each other with oil circuit III 4, be the high pressure hydraulic fluid port, hydraulic fluid port B3 links to each other with oil circuit I 7 by oil circuit IV 13, be the low pressure hydraulic fluid port, the flow of main pump 1 all enters hydraulic motor II 51, hydraulic motor II 51 drives input gear 522 is just changeing, input gear 522 drives hydraulic motor I 53 and output gear 521 carries out high speed rotating, hydraulic motor I 53 counter-rotatings this moment, the oil extraction of A4 hydraulic fluid port, the oil suction of B4 hydraulic fluid port, two hydraulic fluid ports are the low pressure hydraulic fluid port, because the oil suction of B4 hydraulic fluid port, when A2 acquires a certain degree to the pressure drop of B2 oil circuit, there is the danger of locking in the spool of two-way plug-in valve I 36, the spool locking of two-way plug-in valve I 36, A2 will be cut off to the B2 oil circuit, and hydraulic motor I 53 will be inhaled sky, produce serious problems, for avoiding the generation of this situation, suitable return oil pressure need be set, promptly above-mentioned counterbalance valve 11 on system oil return pipeline 8, to guarantee that under this operating mode, the A2 of two-way plug-in valve I 36 opens constantly to the B2 oil circuit; When main control valve 2 is in position, a left side, when solenoid operated directional valve 33 is in the work of position, a left side, oil circuit III 4 is an in-line, oil circuit I 7 is an oil return line, at this moment the pressure of oil circuit III 4 is also greater than the pressure of oil circuit I 7, the pressure signal of oil circuit III 4 enters the P5 hydraulic fluid port of solenoid operated directional valve 33 by shuttle valve 35, enter control cover plate I 34 by the B5 hydraulic fluid port again, enter the control chamber of two-way plug-in valve I 36 at last by the C2 hydraulic fluid port of two-way plug-in valve I 36, the A2 of two-way plug-in valve I 36 is to the locking of B2 oil circuit, the hydraulic oil of two-way plug-in valve II 31 control chambers passes the A5 hydraulic fluid port that control cover plate II 32 enters solenoid operated directional valve by the C1 hydraulic fluid port, pass through the oil return inlet T 5 of solenoid operated directional valve again, and enter fuel tank 9 by double speed valve oil return pipe 10, the A1 of two-way plug-in valve II 31 opens to the B1 oil circuit, oil circuit II 6 is communicated with oil circuit III 4, the A4 hydraulic fluid port that is hydraulic motor I 53 links to each other with oil circuit I 7, be the low pressure hydraulic fluid port, the B4 hydraulic fluid port links to each other with oil circuit III 4 by oil circuit II 6, be the high pressure hydraulic fluid port, the A3 hydraulic fluid port of hydraulic motor II 51 links to each other with oil circuit III 4, be the high pressure hydraulic fluid port, the B3 hydraulic fluid port links to each other with oil circuit I 7, be the low pressure hydraulic fluid port, the flow of main pump 1 enters hydraulic motor II 51 simultaneously, hydraulic motor I 53, hydraulic motor II 51 is just being changeed, 53 counter-rotatings of hydraulic motor I, hydraulic motor II 51, hydraulic motor I 53 drives input gear 522 simultaneously, and input gear 522 drives output gear 521 and carries out low speed rotation.
Claims (4)
1. horizontal directional drilling machine rotary system hydraulic control system, comprise main pump (1), main control valve (2), double speed valve gear (3), unit head assembly (5), unit head assembly (5) mainly comprises hydraulic motor I (53), hydraulic motor II (51) and reductor assembly (52), be connected by oil circuit I (7) between hydraulic fluid port of hydraulic motor I (53) and main control valve (2), another hydraulic fluid port of hydraulic motor I (53) connects oil circuit II (6), be connected by oil circuit III (4) between hydraulic fluid port of hydraulic motor II (51) and main control valve (2), another hydraulic fluid port of hydraulic motor II (51) is connected in oil circuit I (7) by oil circuit IV (13), double speed valve gear (3) is connected in oil circuit I (7), between oil circuit II (6) and oil circuit III (4), it is characterized in that, double speed valve gear (3) comprises two-way plug-in valve I (36), two-way plug-in valve II (31), control cover plate I (34), control cover plate II (32), solenoid operated directional valve (33) and shuttle valve (35), control cover plate I (34), control cover plate II (32) is separately positioned on two-way plug-in valve I (36), on the two-way plug-in valve II (31), shuttle valve (35) is connected to oil circuit I (7), also can be between oil circuit III (4) and solenoid operated directional valve (33) with oil circuit I (7), the pressure signal of the oil circuit that pressure is big in the oil circuit III (4) is introduced the P hydraulic fluid port of described solenoid operated directional valve (33), the A of solenoid operated directional valve (33), the B hydraulic fluid port respectively with described two-way plug-in valve II (31), the C hydraulic fluid port of two-way plug-in valve I (36) links to each other, the A hydraulic fluid port of two-way plug-in valve I (36) links to each other with oil circuit I (7), the A hydraulic fluid port of two-way plug-in valve II (31) links to each other with oil circuit III (4), the B hydraulic fluid port of two-way plug-in valve I (36) links to each other with the B hydraulic fluid port of two-way plug-in valve II (31), and the B hydraulic fluid port of two-way plug-in valve I (36) links to each other with oil circuit II (6) with the B hydraulic fluid port of two-way plug-in valve II (31) simultaneously.
2. horizontal directional drilling machine rotary system hydraulic control system as claimed in claim 1 is characterized in that described shuttle valve (35) is installed in the control cover plate I (34).
3. horizontal directional drilling machine rotary system hydraulic control system as claimed in claim 1 is characterized in that, described electromagnetic valve reversal valve (33) is two four-way electromagnetic reversing valves.
4. horizontal directional drilling machine rotary system hydraulic control system as claimed in claim 1, it is characterized in that, described main control valve (2) is provided with the system oil return pipeline (8) that links to each other with the fuel tank (9) of hydraulic control system, is connected with counterbalance valve (11) on system oil return pipeline (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201709623U CN202090905U (en) | 2011-05-26 | 2011-05-26 | Hydraulic control system for rotating system of horizontal directional drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201709623U CN202090905U (en) | 2011-05-26 | 2011-05-26 | Hydraulic control system for rotating system of horizontal directional drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202090905U true CN202090905U (en) | 2011-12-28 |
Family
ID=45365978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201709623U Expired - Lifetime CN202090905U (en) | 2011-05-26 | 2011-05-26 | Hydraulic control system for rotating system of horizontal directional drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202090905U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220864A (en) * | 2011-05-17 | 2011-10-19 | 柳州固瑞机械有限公司 | Hydraulic control system for rotation system of horizontal directional drilling machine |
| CN116498614A (en) * | 2023-04-24 | 2023-07-28 | 通用技术集团大连机床有限责任公司 | Normally open type large-flux two-way cartridge valve |
-
2011
- 2011-05-26 CN CN2011201709623U patent/CN202090905U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220864A (en) * | 2011-05-17 | 2011-10-19 | 柳州固瑞机械有限公司 | Hydraulic control system for rotation system of horizontal directional drilling machine |
| CN102220864B (en) * | 2011-05-17 | 2013-04-24 | 柳州固瑞机械有限公司 | Hydraulic control system for rotation system of horizontal directional drilling machine |
| CN116498614A (en) * | 2023-04-24 | 2023-07-28 | 通用技术集团大连机床有限责任公司 | Normally open type large-flux two-way cartridge valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102220864B (en) | Hydraulic control system for rotation system of horizontal directional drilling machine | |
| CN102979133B (en) | Rotary brake energy recycling device of hydraulic excavator | |
| CN106015137B (en) | A kind of multi-purpose hydraulic system | |
| CN106958546B (en) | Numeric type hydraulic transformer | |
| CN105020458A (en) | Electro hydraulic actuator for butterfly valve | |
| CN201037377Y (en) | Horizontal positioning drilling machine valve control interflow speeding up hydraulic system | |
| CN103062140A (en) | Hydraulic device on basis of confluence control mode | |
| CN202090905U (en) | Hydraulic control system for rotating system of horizontal directional drilling machine | |
| CN201255151Y (en) | Two-position six-way hand-operated direction valve | |
| CN204692717U (en) | Valve electro-hydraulic actuator | |
| CN203384004U (en) | Pneumatic water pump | |
| CN200982329Y (en) | Two position two-way plug-in valve type high and low pressure switching valve | |
| CN105135033A (en) | Electro-hydraulic-servo-driven valve controlling device | |
| CN201433063Y (en) | Caterpillar crane rotatory closed system | |
| CN112081785A (en) | Fracturing unit truck engine starts valve block and starts hydraulic system | |
| CN201836004U (en) | Hydraulic system | |
| CN201916265U (en) | Novel integrated type series-connected multi-way valve assembly | |
| CN203702681U (en) | Hydraulic control system and concrete pumping equipment | |
| CN106812752B (en) | Multiple directional control valve | |
| CN1112521C (en) | Power-saving energy-accumulating hydraulic power system | |
| CN202266527U (en) | Height-adjustment hydraulic system for coal mining machine | |
| CN204493310U (en) | Portable hydraulic automatic reciprocating mechanism | |
| CN203641137U (en) | Motor energy-saving system for open hydraulic system | |
| CN207935420U (en) | A kind of shift valve block, the more shift control systems of power head and rotary drilling rig | |
| CN108150643B (en) | Gear shifting valve block, power head multi-gear control system and control method and rotary drilling rig |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111228 Effective date of abandoning: 20130424 |
|
| RGAV | Abandon patent right to avoid regrant |