CN113124006A - Hydraulic system for continuously adjusting rock drilling power - Google Patents
Hydraulic system for continuously adjusting rock drilling power Download PDFInfo
- Publication number
- CN113124006A CN113124006A CN202110417947.2A CN202110417947A CN113124006A CN 113124006 A CN113124006 A CN 113124006A CN 202110417947 A CN202110417947 A CN 202110417947A CN 113124006 A CN113124006 A CN 113124006A
- Authority
- CN
- China
- Prior art keywords
- valve
- power
- rock drilling
- pressure
- oil
- 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.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
- F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a continuous rock drilling power regulation hydraulic system which comprises a high-flushing valve, a low-flushing valve, a power valve, a pressure reducing valve and a feedback element, wherein the high-flushing valve is connected with the low-flushing valve; the high-impact valve is connected with an oil inlet of the power valve, the low-impact valve is connected with an oil return port of the power valve, and a working oil port of the power valve is connected with the rock drill through a pressure reducing valve; the control oil circuit of the power valve is connected with the feedback element; the power valve is a three-position three-way valve and comprises a valve body and a valve core, the valve core is arranged in the valve body, and a gap exists between the valve core and the valve body. The invention adopts a pressure control mode to realize the adjustment of the rock drilling power, utilizes a pressure control unit consisting of a high-impact valve, a low-impact valve and a power valve, can realize the switching of high and low punching forces through feedback through the change of the pushing pressure in the rock drilling process, and realizes the automatic matching of the impact pressure and the pushing pressure difference, thereby realizing the high-efficiency rock drilling under a complex rock stratum.
Description
Technical Field
The invention relates to the technical field of rock drilling power adjustment, in particular to a hydraulic system for continuously adjusting rock drilling power.
Background
The power regulation of the rock drilling product is of great importance for the efficient and stable operation of the rock drilling system. The output power of the rock drilling needs to be adjusted in real time according to the rock stratum, so that the rock drilling speed is guaranteed, and the rock drilling efficiency is improved.
The rock drilling power control comprises pressure control and flow control, and the impact energy and the impact frequency of the rock drilling machine of the rock drilling execution piece are changed by changing output flow and pressure. In order to improve the drilling efficiency, it is necessary to adapt the drilling power to the formation variations. However, the existing drilling power control system has the problems of poor adaptability, complex system and the like.
In patent CN103821777A, a power regulating system consisting of a variable displacement pump, a control valve group and a pilot control handle can continuously change the input power during the rock drilling process, but the system is complex and has weak capability of adapting to complex rock formations. In patent CN1140228A, the power during the drilling process is controlled by changing the flow rate of the system, the operation is flexible, and the drilling power cannot be adjusted in real time when the rock formation changes.
In view of the above, there is a need for a continuous drilling power regulation hydraulic system to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a hydraulic system for continuously adjusting rock drilling power, which aims to solve the problems that the rock drilling power is continuously adjusted in real time and the rock drilling power can adapt to complex rock stratums and the like.
In order to achieve the aim, the invention provides a continuous rock drilling power regulation hydraulic system which comprises a high-flushing valve, a low-flushing valve, a power valve, a pressure reducing valve and a feedback element, wherein the high-flushing valve is connected with the low-flushing valve; the high-impact valve is connected with an oil inlet of the power valve, the low-impact valve is connected with an oil return port of the power valve, and a working oil port of the power valve is connected with the rock drill through a pressure reducing valve; the control oil circuit of the power valve is connected with the feedback element;
the power valve is a three-position three-way valve and comprises a valve body and a valve core, the valve core is arranged in the valve body, and a gap exists between the valve core and the valve body.
Furthermore, an oil inlet, an oil return port and a working oil port of the power valve are respectively communicated with the right-position oil cavity, the left-position oil cavity and the middle-position oil cavity.
Further, a spring is arranged in a left oil cavity of the power valve.
Furthermore, the feedback element is a rock drilling propulsion oil cylinder, a large cavity and a small cavity of the rock drilling propulsion oil cylinder are respectively communicated with oil cavities at the right end and the left end of the power valve through oil pipes, and the position of a valve core of the power valve is controlled through the feedback of the propulsion pressure difference in the rock drilling process.
Further, the high-flushing valve and the low-flushing valve adopt pressure regulating springs for pressure regulation.
As another preferred solution, the high and low flushing valves may also be pressure regulated in the form of an electrical proportional regulator.
The technical scheme of the invention has the following beneficial effects:
(1) the invention adopts a pressure control mode to realize the adjustment of the rock drilling power, utilizes a pressure control unit consisting of a high-impact valve, a low-impact valve and a power valve, can realize the switching of high and low punching forces through feedback through the change of the pushing pressure in the rock drilling process, and realizes the automatic matching of the impact pressure and the pushing pressure difference, thereby realizing the high-efficiency rock drilling under a complex rock stratum.
(2) According to the invention, the high punching force and the low punching force are respectively set by the high punching valve and the low punching valve, the position of the valve core of the power valve is determined after the spring force of the power valve is compared with the force generated by the pressure difference of the rock drilling propulsion oil cylinder, a gap exists between the valve body and the valve core of the power valve, and the annular gap is utilized for throttling, so that the continuous regulation of rock drilling power in the rock drilling process is realized, and the working efficiency is greatly improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
figure 1 is a schematic diagram of a continuous adjustment hydraulic system for rock drilling power;
the rock drilling device comprises a rock drilling propulsion oil cylinder, a rock drilling machine, a high-flushing valve, a low-flushing valve, a power valve, a rock drilling propulsion oil cylinder, a rock drilling machine, a pressure reducing valve and a rock drilling machine, wherein the high-flushing valve is 1, the low-flushing valve is 2, the power valve is 3, the rock drilling propulsion oil cylinder is.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1, a continuous rock drilling power regulation hydraulic system comprises a high-flushing valve 1, a low-flushing valve 2, a power valve 3, a pressure reducing valve 5 and a feedback element; the high-flushing valve 1 is connected with an oil inlet of the power valve 3, the low-flushing valve 2 is connected with an oil return port of the power valve 3, and a working oil port of the power valve 3 is connected with a rock drill 6 through a pressure reducing valve 5; the control oil circuit of the power valve 3 is connected with a feedback element;
the power valve 3 is a three-position three-way valve and comprises a valve body and a valve core, the valve body is cylindrical, the valve core is arranged in the valve body, an annular gap exists between the valve core and the valve body, h is the width of the gap, and x is the horizontal distance from the right end face of the valve core to an oil port, namely the gap throttling length, as shown in fig. 1. An oil inlet, an oil return port and a working oil port of the power valve 3 are respectively communicated with the right-position oil cavity, the left-position oil cavity and the middle-position oil cavity. A spring is arranged in a left oil cavity of the power valve 3.
The feedback element is a rock drilling propulsion oil cylinder 4, a large cavity and a small cavity of the rock drilling propulsion oil cylinder 4 are respectively communicated with oil cavities at the right end and the left end of the power valve 3 through oil pipes, and the position of a valve core of the power valve 3 is controlled through the feedback of the propulsion pressure difference in the rock drilling process.
The high-flushing valve 1 and the low-flushing valve 2 can adopt pressure regulating springs for pressure regulation and also can adopt an electric proportion regulation mode for pressure regulation. The present embodiment preferably uses a pressure regulating spring for flow regulation, assuming that the set pressure of the high flush valve 1 is PV1The set pressure of the low flushing valve 2 is PV2The pressure of the working oil port after the impact pilot oil passes through the power valve 3 is changed into PV3。
The working principle of the drilling power continuous adjustment hydraulic system is as follows:
the high-pressure valve 1 regulates the high-pressure of the system, and the outlet pressure of the impact pilot oil after passing through the high-pressure valve 1 is the set value P of the high-pressureV1. After the impact pilot oil passes through the power valve 3, the pressure is changed into PV3. By PV3The outlet pressure of the main oil line impact reducing valve 5 is controlled, so that the impact power of the rock drilling machine 6 is controlled. High flushing outlet hydraulic oil enters the power valve 3, and if the valve core of the power valve 3 is in the left position, the high flushing outlet pressure oil directly enters an intermediate oil cavity, P, of the power valve 3 without being throttled by a gapV1And PV3The pressure difference therebetween is small. At the moment, gap throttling exists between the middle oil cavity of the power valve 3 and the low flushing valve 2, and due to the effect of throttling hydraulic resistance, P is formed at the momentV3And PV2The pressure difference of (3) is large. The outlet pressure P of the power valve 3 when the spool is in the left positionV3Near the set pressure P of the high flush valve 1V1。
If the valve core of the power valve 3 is in the right position, the outlet pressure oil of the high flushing valve 1 enters the power valve 3 through the gap throttling, and due to the effect of throttling hydraulic resistance, P is enabled to be in the right positionV1And PV3The pressure difference therebetween is large. The hydraulic oil in the middle oil cavity of the power valve 3 directly enters the low flushing valve 2 without throttling, and at the moment PV3And PV2So that the outlet pressure P of the power valve 3 is smallV3Near the set pressure P of the low flush valve 2V2. When the valve core of the power valve 3 is in the middle position, P is changed along with the change of the slit throttling length xV1And PV3Pressure difference therebetween and PV3And PV2The pressure difference therebetween changes, so that PV3Continuously as the throttle length x changes.
The power valve 3 is further explained by combining a principle sketch (figure 1) of the power valve 3, and pressure oil of a large cavity and a small cavity of a rock drilling propulsion oil cylinder 4 in the rock drilling process is respectively fed back to oil cavities at two ends of the power valve 3. The position of the valve core of the power valve 3 is controlled by the feedback of the propelling pressure difference in the rock drilling process, and then the matching of the impact pressure and the propelling pressure is realized. The pressure of a large cavity of the propulsion oil cylinder is introduced into the right end of a valve core of the power valve 3, and the pressure is PA2The left end of the valve core of the power valve 3 is led in the pressure of the small cavity of the propulsion oil cylinder, and the pressure is PA1. And the left end of the valve core of the power valve 3 is also subjected to spring force FKIn which the spring force FKCan be set by pressure regulating screws. When the pressure difference delta P of the pushing oil is constant in the rock drilling process, the difference F of the acting force at the two ends of the valve coreA2-FA1And (4) determining.
When stabilizing the drilling, FA2-FA1And spring force FKEqual, the impact pressure at the control unit outlet is constant. If working conditions such as interlayer or rock stratum softening and the like are met in the process, the pressure difference delta P between the two ends of the propulsion oil cylinder is reduced, and the acting force difference F between the two ends of the valve coreA2-FA1And then the impact pressure is reduced to low impact pressure, so that the impact pressure automatically adapts to the change of the rock stratum. If the rock stratum becomes hard in the rock drilling process, the differential pressure delta P between the two ends of the propulsion oil cylinder is increased, and the acting force difference F between the two ends of the valve coreA2-FA1And the pressure is increased along with the pressure, so that the valve core of the power valve 3 moves leftwards, the valve core is in a left position, and the rock drilling work is completed under high punching pressure.
The continuous rock drilling power regulation hydraulic system can realize stepless regulation of rock drilling pressure, so that the automatic matching of impact pressure and propulsion pressure in the rock drilling process is realized, and the continuous rock drilling power regulation hydraulic system is suitable for different surrounding rock conditions. The optimal configuration of impact power under different working conditions is achieved, and efficient rock drilling is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A continuous rock drilling power regulation hydraulic system is characterized by comprising a high-impact valve (1), a low-impact valve (2), a power valve (3), a pressure reducing valve (5) and a feedback element; the high-impact valve (1) is connected with an oil inlet of the power valve (3), the low-impact valve (2) is connected with an oil return port of the power valve (3), and a working oil port of the power valve (3) is connected with a rock drill (6) through a pressure reducing valve (5); the control oil circuit of the power valve (3) is connected with a feedback element;
the power valve (3) is a three-position three-way valve and comprises a valve body and a valve core, the valve core is arranged in the valve body, and a gap exists between the valve core and the valve body.
2. A continuous rock drilling power adjustment hydraulic system as claimed in claim 1, characterized in that the oil inlet, the oil return and the working oil port of the power valve (3) communicate with the right-position oil chamber, the left-position oil chamber and the middle-position oil chamber, respectively.
3. A continuously regulated hydraulic system for rock drilling power as claimed in claim 2, characterized in that a spring is provided in the left-hand oil chamber of the power valve (3).
4. A rock drilling power continuous adjustment hydraulic system according to claim 3, characterized in that the feedback element is a rock drilling propulsion cylinder (4), the large cavity and the small cavity of the rock drilling propulsion cylinder (4) are respectively communicated with the oil cavities at the right end and the left end of the power valve (3) through oil pipes, and the control of the valve core position of the power valve (3) is realized through the feedback of the propulsion pressure difference in the rock drilling process.
5. A continuous rock drilling power regulation hydraulic system as claimed in any one of claims 1 to 4, characterized in that the high-stroke valve (1) and the low-stroke valve (2) are pressure regulated using pressure regulating springs.
6. A continuously regulated hydraulic system for rock drilling power according to any one of claims 1 to 4, characterized in that the high-stroke valve (1) and the low-stroke valve (2) are pressure regulated in the form of an electrical proportional regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110417947.2A CN113124006B (en) | 2021-04-19 | 2021-04-19 | Hydraulic system for continuously adjusting rock drilling power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110417947.2A CN113124006B (en) | 2021-04-19 | 2021-04-19 | Hydraulic system for continuously adjusting rock drilling power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113124006A true CN113124006A (en) | 2021-07-16 |
| CN113124006B CN113124006B (en) | 2023-04-07 |
Family
ID=76777531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110417947.2A Active CN113124006B (en) | 2021-04-19 | 2021-04-19 | Hydraulic system for continuously adjusting rock drilling power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113124006B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1253538A (en) * | 1968-07-02 | 1971-11-17 | Af Hydraulics | A transducer for converting liquid pressure oscillations into mechanical oscillations |
| US3995700A (en) * | 1975-10-14 | 1976-12-07 | Gardner-Denver Company | Hydraulic rock drill system |
| US4410049A (en) * | 1977-06-21 | 1983-10-18 | Atlas Copco Aktiebolag | Directional valve means for positioning machine units |
| JPH05337845A (en) * | 1992-06-08 | 1993-12-21 | Furukawa Co Ltd | Stroke mechanism for hydraulic rock drill |
| CN201056984Y (en) * | 2006-11-24 | 2008-05-07 | 鲍伟 | Gas-liquid linkage rock drill vehicle |
| JP2010521603A (en) * | 2007-03-16 | 2010-06-24 | アトラス コプコ ロツク ドリルス アクチボラグ | Rock drill control method and apparatus and rock drill |
| CN202882751U (en) * | 2012-11-16 | 2013-04-17 | 湖南江麓重工科技有限公司 | Improved rock drill hydraulic system based on excavator hydraulic system |
| CN203770271U (en) * | 2014-01-17 | 2014-08-13 | 中南大学 | Oil way system for conducting stepless adjusting control on rock drill |
| CN104653529A (en) * | 2015-02-11 | 2015-05-27 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | System of drill jumbo for preventing drill bit from being stuck in karst cave |
| CN204877258U (en) * | 2015-08-05 | 2015-12-16 | 江西蓝翔重工有限公司 | Press hydraulic rock drill control system of power control anti -sticking borer |
| CN205298111U (en) * | 2015-12-11 | 2016-06-08 | 重庆纳川山隅重工设备有限公司 | Hydraulic pressure rock drilling machine's rock drill spin control return circuit |
| CN106438532A (en) * | 2016-11-12 | 2017-02-22 | 湘潭大学 | Electric proportional control type rock drill rock drilling efficiency automatic control system |
| CN206346729U (en) * | 2016-12-27 | 2017-07-21 | 中铁工程装备集团有限公司 | Rock drill automatic rollback control system |
| CN207761575U (en) * | 2017-11-28 | 2018-08-24 | 恒天九五重工有限公司 | The auxiliary pump Confluent control system of rotary drilling rig main pump |
| CN109854553A (en) * | 2019-04-03 | 2019-06-07 | 四川钻神智能机械制造有限公司 | A kind of anti-sticking pricker system in chance cavity of drill jumbo |
-
2021
- 2021-04-19 CN CN202110417947.2A patent/CN113124006B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1253538A (en) * | 1968-07-02 | 1971-11-17 | Af Hydraulics | A transducer for converting liquid pressure oscillations into mechanical oscillations |
| US3995700A (en) * | 1975-10-14 | 1976-12-07 | Gardner-Denver Company | Hydraulic rock drill system |
| US4410049A (en) * | 1977-06-21 | 1983-10-18 | Atlas Copco Aktiebolag | Directional valve means for positioning machine units |
| JPH05337845A (en) * | 1992-06-08 | 1993-12-21 | Furukawa Co Ltd | Stroke mechanism for hydraulic rock drill |
| CN201056984Y (en) * | 2006-11-24 | 2008-05-07 | 鲍伟 | Gas-liquid linkage rock drill vehicle |
| JP2010521603A (en) * | 2007-03-16 | 2010-06-24 | アトラス コプコ ロツク ドリルス アクチボラグ | Rock drill control method and apparatus and rock drill |
| CN202882751U (en) * | 2012-11-16 | 2013-04-17 | 湖南江麓重工科技有限公司 | Improved rock drill hydraulic system based on excavator hydraulic system |
| CN203770271U (en) * | 2014-01-17 | 2014-08-13 | 中南大学 | Oil way system for conducting stepless adjusting control on rock drill |
| CN104653529A (en) * | 2015-02-11 | 2015-05-27 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | System of drill jumbo for preventing drill bit from being stuck in karst cave |
| CN204877258U (en) * | 2015-08-05 | 2015-12-16 | 江西蓝翔重工有限公司 | Press hydraulic rock drill control system of power control anti -sticking borer |
| CN205298111U (en) * | 2015-12-11 | 2016-06-08 | 重庆纳川山隅重工设备有限公司 | Hydraulic pressure rock drilling machine's rock drill spin control return circuit |
| CN106438532A (en) * | 2016-11-12 | 2017-02-22 | 湘潭大学 | Electric proportional control type rock drill rock drilling efficiency automatic control system |
| CN206346729U (en) * | 2016-12-27 | 2017-07-21 | 中铁工程装备集团有限公司 | Rock drill automatic rollback control system |
| CN207761575U (en) * | 2017-11-28 | 2018-08-24 | 恒天九五重工有限公司 | The auxiliary pump Confluent control system of rotary drilling rig main pump |
| CN109854553A (en) * | 2019-04-03 | 2019-06-07 | 四川钻神智能机械制造有限公司 | A kind of anti-sticking pricker system in chance cavity of drill jumbo |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113124006B (en) | 2023-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100491748C (en) | Independent control electrohydraulic system of oil inlet and outlet matching with pump valve composite flux | |
| CN100575717C (en) | A kind of energy-saving type shield hydraulic control system that adopts hydraulic transformer | |
| US10260532B2 (en) | Intelligent load-sensing electro-hydrostatic actuator | |
| CN105545852B (en) | High-speed switch pilot proportioning valve | |
| CN108412829B (en) | Load sensitive type multi-way valve with independently adjustable inlet and outlet throttling edges | |
| CN109695599B (en) | Variable hydraulic system, pump output flow control method and engineering machinery | |
| CN102261351A (en) | Simple proportional load sensitive hydraulic system | |
| CN204099146U (en) | Hydraulic variable displacement pump | |
| CN204284032U (en) | Single actuator automatic switchover rapid movement oil hydraulic circuit | |
| CN106194680B (en) | The axial plunger pump installation and control method of a kind of high-precision electric proportional control | |
| CN113124006B (en) | Hydraulic system for continuously adjusting rock drilling power | |
| CN208185091U (en) | Positive control load sensitive system | |
| CN202718623U (en) | Key drilling action single-pump hydraulic control loop of cutting drilling machine | |
| CN204851832U (en) | Adjustable propulsion valve unit of single bleeding pressure power | |
| CN203532367U (en) | Multi-gear power control variable displacement piston pump | |
| CN103726784B (en) | Hydraulic drill rig Solid rocket engine impacts hydraulic circuit and control method thereof | |
| CN110671376B (en) | Engineering machinery load sensitive-inlet-outlet independent hydraulic system and control method thereof | |
| CN205918570U (en) | Axial plunger pump device of high accuracy electric proportional control | |
| CN103423225A (en) | Low-energy-consumption hydraulic open-type walking system and control method | |
| CN103527542A (en) | Variable pump hydraulic circuit and engineering machine | |
| CN203716840U (en) | Hydraulic drill carriage pushing control impact hydraulic loop | |
| CN102691331B (en) | Damping valve for hydraulic excavator and control method thereof | |
| CN203836337U (en) | Oil inlet valve body of load-sensitive multi-way valve of mini-excavator | |
| CN103511369A (en) | Multi-gear power control variable piston pump | |
| CN106438523B (en) | Hydraulic system and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |