CN113983022A - Hydraulic system and rotary drilling rig - Google Patents

Hydraulic system and rotary drilling rig Download PDF

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Publication number
CN113983022A
CN113983022A CN202111479163.9A CN202111479163A CN113983022A CN 113983022 A CN113983022 A CN 113983022A CN 202111479163 A CN202111479163 A CN 202111479163A CN 113983022 A CN113983022 A CN 113983022A
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CN
China
Prior art keywords
valve
pressure
oil
oil port
cut
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Pending
Application number
CN202111479163.9A
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Chinese (zh)
Inventor
张焰明
牛慧峰
张昊
李金龙
李远虎
陈莎莎
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Beijing CRRC Heavy Industry Mechanics Co Ltd
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Beijing CRRC Heavy Industry Mechanics Co Ltd
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Publication date
Application filed by Beijing CRRC Heavy Industry Mechanics Co Ltd filed Critical Beijing CRRC Heavy Industry Mechanics Co Ltd
Priority to CN202111479163.9A priority Critical patent/CN113983022A/en
Publication of CN113983022A publication Critical patent/CN113983022A/en
Pending legal-status Critical Current

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    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/086—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a fluid-actuated cylinder
    • 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
    • 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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • F15B2013/0448—Actuation by solenoid and permanent magnet
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The embodiment of the invention discloses a hydraulic system, which comprises a pull rope oil cylinder with a hydraulic lock, a hydraulic pump for supplying oil to the pull rope oil cylinder and a pressure cut-off valve, wherein the hydraulic pump is connected with the pull rope oil cylinder; a first oil port of the pressure cut-off valve is communicated with the hydraulic pump, and a second oil port of the pressure cut-off valve is communicated with a rod cavity of the pull rope oil cylinder through a first one-way valve of the hydraulic lock; when the tension force of the pull rope oil cylinder is smaller than a preset value, a first oil port and a second oil port of the pressure cut-off valve are communicated; and when the tension force of the pull rope oil cylinder reaches a preset value, the first oil port and the second oil port of the pressure cut-off valve are cut off. According to the hydraulic system provided by the invention, the pressure cut-off valve is arranged, so that the oil way is automatically cut off when the tensioning force of the rope pulling oil cylinder reaches a preset value, an observer does not need to judge the tensioning state of the steel wire rope and instruct the tensioning action to stop. The embodiment of the invention also discloses a rotary drilling rig.

Description

Hydraulic system and rotary drilling rig
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a hydraulic system and a rotary drilling rig.
Background
The rotary drilling rig is a construction machine suitable for hole forming operation in building foundation engineering, is widely applied to foundation construction engineering such as municipal construction, highway bridges, high-rise buildings and the like, is matched with different drilling tools, is suitable for hole forming operation of dry (short spiral), wet (rotary bucket) and rock strata (core drill), and has the characteristics of large installed power, large output torque, large axial pressure, flexibility, high construction efficiency, multiple functions and the like.
For the rotary drilling rig adopting the pressurization winch for pressurization, one end of a steel wire rope of the pressurization winch of the rotary drilling rig is fixed by a wedge sleeve and is not stretchable, the other end of the steel wire rope is connected to the end of a piston rod of the stay rope oil cylinder, and the steel wire rope can stretch out and retract along with the piston rod of the stay rope oil cylinder to realize rope loosening and tensioning of the steel wire rope. When the rotary drilling rig is pressurized and hoisted to work, the piston rod of the rope pulling oil cylinder retracts, and the steel wire rope is tensioned; when the rotary drilling rig does not work, the piston rod of the rope pulling oil cylinder extends out, and the steel wire rope of the pressurized winch loosens the rope.
In a hydraulic system used by a pull rope oil cylinder in the prior art, when a pressurized winch needs to work, an operator operates the pull rope oil cylinder in a cab to pull a steel wire rope, another person is needed to observe the pulling condition of the steel wire rope beside a drilling machine at the moment, when the pressurized winch steel wire rope is tightened and clings to a pulley groove, the operator is informed to stop operating, and the operator releases a pull button.
As shown in fig. 1, in a hydraulic system of an existing rotary drilling rig, when a rope pulling cylinder 3 needs to be tensioned, a load is established by an auxiliary valve piece, the load is fed back to a hydraulic pump 4 through a multi-way valve 11, the hydraulic pump 4 establishes pressure, an operator needs to operate a three-position four-way electromagnetic directional valve 10 to be powered on at the left side, at the moment, the electromagnetic directional valve 10 is switched from a normal middle position to a left position, pressure oil passes through the left position of the electromagnetic directional valve 10 and reaches a rod cavity of the rope pulling cylinder 3 through a first one-way valve of a pressure lock 2, and the rope pulling cylinder 3 performs a steel wire rope tensioning action. When an operator operates in a cab, another person is required to observe the tensioning condition of the steel wire rope beside the rotary drilling rig, when the steel wire rope is tensioned and clings to the pulley groove, the operator is informed to stop operating, the operator releases the tensioning button and disconnects the electromagnetic directional valve 10 to enable the electromagnetic directional valve 10 to be positioned at a middle position, at the moment, the pressure of a rod cavity and a rodless cavity of the rope pulling oil cylinder 3 is maintained by the hydraulic lock 2, and the rope pulling oil cylinder 3 maintains the tensioning force; in the rope releasing process, an operator operates the right side of the three-position four-way electromagnetic directional valve 10 to be electrified, at the moment, the electromagnetic directional valve 10 is switched from a normal middle position to a right position, pressure oil passes through the right position of the electromagnetic directional valve 10 and reaches a rodless cavity of the rope pulling oil cylinder 3 through a second one-way valve of the pressure lock 2, the rope pulling oil cylinder 3 performs the action of releasing the steel wire rope, meanwhile, the other person observes the releasing condition of the steel wire rope beside the rotary drilling rig and timely informs the operator to stop the operation, the operator releases a rope releasing button and disconnects the electromagnetic directional valve 10, and the electromagnetic directional valve 10 is enabled to return to the middle position.
It can be seen that, when the hydraulic system in the prior art realizes the tensioning action of the steel wire rope, another person is required to observe and command beside the steel wire rope, which is troublesome, and due to the experience difference of observers, the tensioning state of the steel wire rope at each time is difficult to accurately judge only by visual observation of the observers.
Therefore, how to ensure that the problem of low accuracy caused by artificially judging the tensioning state is avoided on the premise that one operator can also complete the tensioning operation is a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a hydraulic system to achieve the purpose that a single operator can accurately complete the tensioning operation of a pull-rope cylinder.
The invention further aims to provide a rotary drilling rig.
In order to achieve the purpose, the invention provides the following technical scheme:
a hydraulic system comprises a pull rope oil cylinder with a hydraulic lock, a hydraulic pump for supplying oil to the pull rope oil cylinder and a pressure cut-off valve;
a first oil port of the pressure cut-off valve is communicated with the hydraulic pump, and a second oil port of the pressure cut-off valve is communicated with a rod cavity of the pull rope oil cylinder through a first one-way valve of the hydraulic lock;
when the tension force of the pull rope oil cylinder is smaller than a preset value, a first oil port and a second oil port of the pressure cut-off valve are communicated;
and when the tension force of the pull rope oil cylinder reaches a preset value, the first oil port and the second oil port of the pressure cut-off valve are cut off.
Preferably, in the above hydraulic system, the pressure cut-off valve is a normally open hydraulic control valve, a hydraulic control port of the pressure cut-off valve is communicated with the first oil port of the pressure cut-off valve, and when the pressure of the hydraulic control port of the pressure cut-off valve reaches a preset pressure, the tensioning force of the rope pulling cylinder reaches a preset value.
Preferably, in the hydraulic system, the pressure cut-off valve is a normally open hydraulic control reversing valve, and a third oil port of the pressure cut-off valve is communicated with an oil tank;
when the pressure of a hydraulic control port of the pressure cut-off valve is smaller than the preset pressure, a first oil port and a second oil port of the pressure cut-off valve are communicated, and a third oil port of the pressure cut-off valve is cut off;
when the pressure of the hydraulic control port of the pressure stop valve reaches the preset pressure, the second oil port and the third oil port of the pressure stop valve are communicated, and the first oil port of the pressure stop valve is stopped.
Optionally, in the above hydraulic system, a pressure sensor is further included for detecting a supply pressure on a rod cavity supply line of the pull-cord cylinder;
when the oil supply pressure is smaller than a preset pressure value, the tension force of the rope pulling oil cylinder is smaller than a preset value;
and when the oil supply pressure reaches a preset pressure value, the tension force of the rope pulling oil cylinder reaches a preset value.
Preferably, in the hydraulic system, the pressure cut-off valve is an electromagnetic directional valve, and a third oil port of the pressure cut-off valve is communicated with the oil tank;
when the oil supply pressure is smaller than a preset pressure value, the pressure cut-off valve is powered off, a first oil port and a second oil port of the pressure cut-off valve are communicated, and a third oil port of the pressure cut-off valve is cut off;
when the oil supply pressure reaches a preset pressure value, the pressure stop valve is powered on, a second oil port and a third oil port of the pressure stop valve are communicated, and a first oil port of the pressure stop valve is cut off.
Preferably, in the above hydraulic system, a working condition switching valve for switching the rope pulling cylinder between a rope tightening working condition and a rope loosening working condition is arranged between the hydraulic pump and the pressure cut-off valve;
a first oil port of the working condition switching valve is communicated with the hydraulic pump, a second oil port of the working condition switching valve is communicated with a first oil port of the pressure stop valve, a third oil port of the working condition switching valve is communicated with a rodless cavity of the pull rope oil cylinder through a second one-way valve of the hydraulic lock, and a fourth oil port of the working condition switching valve is communicated with the oil tank;
when the valve core of the working condition switching valve is located at the first position, the first oil port of the working condition switching valve is communicated with the second oil port, and the third oil port is communicated with the fourth oil port;
when the valve core of the working condition switching valve is located at the second position, the first oil port and the third oil port of the working condition switching valve are communicated, and the second oil port and the fourth oil port are communicated.
Preferably, in the hydraulic system, the valve spool is in the first position in a normal state of the operating condition switching valve.
Preferably, in the hydraulic system, the operating condition switching valve is a two-position four-way manual reversing valve or a two-position four-way electromagnetic reversing valve.
Preferably, in the hydraulic system, the pressure oil pressure output by the hydraulic pump when the rope pulling cylinder is in a rope releasing working condition is 30-45 bar.
The invention also provides a rotary drilling rig which comprises a hydraulic system, wherein the hydraulic system has one or more technical effects.
According to the technical scheme, the hydraulic system is different from the prior art in that the pressure cut-off valve used for limiting the maximum tensioning force of the stay rope oil cylinder for tensioning the steel wire rope is arranged, the pressure cut-off valve performs the action of tensioning the steel wire rope on the stay rope oil cylinder, when the tensioning force is smaller than a preset value, the first oil port is communicated with the second oil port, and the hydraulic pump is communicated with an oil path between the stay rope oil cylinder; when the tension force reaches a preset value, the first oil port and the second oil port are cut off, the oil path between the hydraulic pump and the pull rope oil cylinder is cut off, at the moment, the pull rope oil cylinder stops the action of tensioning the steel wire rope, and the tension force of the preset value is kept in the pull rope oil cylinder to work. In the working process of tensioning the steel wire rope by the rope pulling oil cylinder, manual observation and command are not needed, the problem of low observation accuracy of personnel is avoided, meanwhile, one operator is reduced, and the operation cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a hydraulic schematic diagram of a pull-cord cylinder in the prior art;
FIG. 2 is a hydraulic schematic diagram of a pull cord state provided by an embodiment of the present invention;
FIG. 3 is a hydraulic schematic diagram illustrating the cutting of a pressure shut-off valve according to an embodiment of the present invention;
FIG. 4 is a hydraulic schematic diagram of a slack rope condition provided by an embodiment of the present invention;
wherein, 1 is the pressure trip valve, 2 is the hydraulic pressure lock, 3 is the stay cord hydro-cylinder, 4 is the hydraulic pump, 5 is the operating mode diverter valve, 6 is the oil tank, 10 is the solenoid directional valve, 11 is the multiple unit valve.
In fig. 1, the same reference numerals as those in other drawings denote the same components.
Detailed Description
The core of the invention is to provide a hydraulic system to achieve the aim that a single operator can also accurately complete the tensioning operation process of the rope pulling oil cylinder.
The other core of the invention is to provide the rotary drilling rig with the hydraulic system.
In order that those skilled in the art will better understand the solution of the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
As shown in fig. 2, the hydraulic system disclosed in the embodiment of the present invention includes a rope cylinder 3 having a hydraulic lock 2 and a hydraulic pump 4 for supplying oil to the rope cylinder 3, and the present embodiment is characterized in that a pressure cut-off valve 1 is further added.
Wherein:
the hydraulic lock 2 is the same as the prior art and is composed of two check valves, so that the structure of the hydraulic lock 2 is simply introduced for the convenience of understanding the application, and when the check valve of the hydraulic lock 2 is reversely conducted, so that the description is omitted, and the principle of the hydraulic lock 2 in the prior art can be referred to. The oil ports at two ends of one of the one-way valves of the hydraulic lock 2 are respectively an oil port A1Oil mixing port L1And at the oil port A1To the oil port L1In the direction of (A), the one-way valve is in a conducting state, and oil ports at two ends of the other one-way valve are respectively an oil port A2Oil mixing port L2And at the oil port A2To the oil port L2In the direction of (2), the one-way valve is in a conducting state. Oil port L1Is communicated with a rod cavity of the pull rope oil cylinder 3, and has an oil port L2Is communicated with the rodless cavity of the rope pulling oil cylinder 3.
First oil port P of pressure cut-off valve 11A second oil port B communicated with the hydraulic pump 4 and used for pressure cut-off valve 11Oil port A of hydraulic lock 21The hydraulic port A of the hydraulic lock 2 is communicated2Communicating with the tank 6.
In the working process when the rope pulling oil cylinder 3 tensions the steel wire rope, when the tensioning force of the rope pulling oil cylinder 3 is smaller than the preset value, the first oil port P of the pressure cut-off valve 11And a second oil port B1And at the moment, the pressure oil flows into the rod cavity of the rope pulling oil cylinder 3 through the hydraulic pump 4, and the rope pulling oil cylinder 3 performs the action of tensioning the steel wire rope.
When the tension of the rope pulling cylinder 3 reaches a preset value, as shown in fig. 3, the first oil port P of the pressure cut-off valve 11And a second oil port B1At the moment, the pressure oil can not flow into the rod cavity of the rope pulling oil cylinder 3 through the hydraulic pump 4, the rope pulling oil cylinder 3 stops the action of tensioning the steel wire rope, the force of the rope pulling oil cylinder 3 for tensioning the steel wire rope is a preset value, the pressure in the rod cavity and the pressure in the rodless cavity are kept under the action of the hydraulic lock 2, and the rope pulling oil cylinder 3 keeps the tensioning force on the steel wire rope.
It should be noted that, in the above embodiment, in the process of tensioning the steel wire rope by the rope pulling cylinder 3, the operator only needs to operate the handle for pressurization, so as to achieve the action of tensioning the steel wire rope by the rope pulling cylinder 3, and when the tensioning force reaches the preset value, the tensioning is stopped under the action of the pressure cut-off valve 1, and the rope pulling cylinder 3 operates with the tensioning force of the preset value maintained.
It should be further noted that, in the above embodiment, the preset value of the tensioning force of the rope pulling cylinder 3 generally needs to be calibrated according to experience and experimental data of an operator, so that when the tensioning force of the rope pulling cylinder 3 reaches the preset value, the requirement is met, that is, the steel wire rope is tightened and tightly attached to the pulley groove.
The hydraulic system provided by the invention is different from the prior art in that the pressure cut-off valve 1 for limiting the maximum tension of the stay rope oil cylinder for tensioning the steel wire rope is arranged, the pressure cut-off valve 1 performs the action of tensioning the steel wire rope on the stay rope oil cylinder 3, and when the tension is smaller than a preset value, the first oil port P of the pressure cut-off valve 11And a second oil port B1And the hydraulic pump 4 is communicated with an oil path between the pull rope oil cylinders 3. When the tensioning force reaches a preset value, the first oil port P of the pressure cut-off valve 11And a second oil port B1And when the oil way between the hydraulic pump 4 and the pull rope oil cylinder 3 is cut off, the pull rope oil cylinder 3 stops the action of tensioning the steel wire rope, and the preset tensioning force is kept in the pull rope oil cylinder 3 for subsequent work. The hydraulic system provided by the invention not only accurately controls the maximum tensioning force of the rope pulling oil cylinder 3, but also simplifies the operation process of an operator, and the operator can finish the process of tensioning the steel wire rope by the rope pulling oil cylinder 3 only by operating the handle of the pressurization action without continuously operating the tensioning button and loosening the tensioning button under the command of an observer as in the prior art, thereby simplifying the operation process.
Further, the pressure cut-off valve 1 in the above scheme is a normally open hydraulic control valve, and the pressure cut-off valve 1 keeps the first oil port P without external force1And a second oil port B1And the pressure oil provided by the hydraulic pump 4 can directly flow into the rod cavity of the pull rope oil cylinder 3. Hydraulic control port of pressure cut-off valve 1 and first oil port P of pressure cut-off valve 11And communicating, and when the pressure of the hydraulic control port reaches the preset pressure, the tension of the rope pulling oil cylinder 3 reaches the preset value.
It should be noted that, in the working process of tensioning the steel wire rope by the rope pulling cylinder 3, the pressure in the rod cavity of the rope pulling cylinder 3 will continuously rise, so that the first oil port P of the pressure cut-off valve 11And the pressure acting on the hydraulic control port of the pressure cut-off valve 1 continuously rises until reaching a preset pressure value, and the valve core of the normally open type hydraulic control valve is pushed to act so as to cut off the first oil port P1And a second oil port B1The communication relationship of (1). When the pressure at the hydraulic control port of the pressure cut-off valve 1 is smaller than the preset pressure value, the first oil port P is kept1And a second oil port B1The communication relationship of (1). The preset pressure value can be calibrated by the spring force of the pressure cut-off valve 1, namely the oil pressure at the hydraulic control port of the pressure cut-off valve 1 can overcome the spring force to push the valve core to act.
Further, the pressure cut-off valve 1 in the above scheme is a normally open type hydraulic control reversing valve, and a third oil port T of the pressure cut-off valve 11Communicating with the tank 6.
As shown in FIG. 2, the pressure cut-off valve 1 is in a normal stateThe core is at the first position due to the action of the internal spring force, and the first oil port P1And a second oil port B1A third oil port T1At the time of stopping, the pressure oil provided by the hydraulic pump 4 flows into the first oil port P of the pressure stop valve 11And passes through the second oil port B1The first oil port A flowing into the hydraulic lock 21And the first one-way valve of the hydraulic lock 2 is communicated with a rod cavity of the rope pulling oil cylinder 3, and the rope pulling oil cylinder 3 performs the action of tensioning the steel wire rope.
When the pressure of the hydraulic control port of the pressure cut-off valve 1 is less than the preset pressure, the pressure cut-off valve 1 maintains the first port P1And a second oil port B1A third oil port T of the pressure cut-off valve 11First oil port P of stop pressure cut-off valve 11The pressure of the hydraulic control port continuously rises, and as shown in fig. 3, when the pressure of the hydraulic control port of the pressure cutoff valve 1 reaches the preset pressure, the second port B of the pressure cutoff valve 11And a third oil port T1A first oil port P of the pressure cut-off valve 11And at the moment, the pressure oil cannot be continuously transmitted to the pull rope oil cylinder 3 by the hydraulic pump 4, and the pressure in the rod cavity and the rodless cavity in the pull rope oil cylinder 3 is preset pressure and is kept by the hydraulic lock 2.
The hydraulic port of the pressure cut-off valve 1 is connected to an internal pressure spring, and the first port P of the pressure cut-off valve 1, which is the hydraulic port, is provided1When pressure oil exists, the pressure spring is under the pressure action of the pressure oil; when the pressure of the hydraulic control port reaches the preset pressure, the pressure oil can overcome the elastic force of the spring and compress the spring, the spring drives the valve core of the pressure stop valve 1 to move, and the pressure stop valve 1 is opened from the normal state, namely the first oil port P1And a second oil port B1A third oil port T1The cut-off state is switched to the closed state, namely the second oil port B1And a third oil port T1Connected through a first oil port P1In the cut-off state, the hydraulic oil supplied by the hydraulic pump 4 cannot continue to reach the rod cavity of the pull-rope cylinder 3 through the pressure cut-off valve 1.
It is further noted that the pressure cut-off valve 1 leaks and accumulates hydraulic oil in the spring cavity during use, which causes the pair of spring cavitiesThe pressure of the valve core rises to influence the subsequent use, so that the spring cavity and the third oil port T in the pressure cut-off valve 11And the connection is realized, so that the hydraulic oil leaked from the spring cavity can flow into the oil tank 6 in time, and the smooth operation of a hydraulic system is ensured.
In another embodiment provided by the present invention, a pressure sensor is disposed on the oil supply pipeline with rod cavity of the pull-rope oil cylinder 3, and is used for detecting the oil supply pressure on the oil supply pipeline, and when the detected oil supply pressure is smaller than a preset pressure value, it indicates that the tension of the pull-rope oil cylinder 3 is smaller than the preset value; when the oil supply pressure is detected to reach the preset pressure value, the tensioning force of the rope pulling oil cylinder 3 is indicated to reach the preset value.
Further, the pressure cut-off valve 1 is an electromagnetic directional valve and can receive pressure value information detected by the pressure sensor, and a third oil port of the pressure cut-off valve 1 is communicated with the oil tank 6.
When the pressure sensor detects that the oil supply pressure is smaller than the preset pressure value, the pressure cut-off valve 1 is controlled to be powered off, and the first oil port P of the pressure cut-off valve 11And a second oil port B1A third oil port T1And when the pressure is cut off, the oil supply pressure value continuously rises. At this time, the pressure oil provided by the hydraulic pump 4 flows into the first port P of the pressure cut-off valve 11And passes through the second oil port B1The first oil port A flowing into the hydraulic lock 21And the first one-way valve of the hydraulic lock 2 is communicated with a rod cavity of the rope pulling oil cylinder 3, and the rope pulling oil cylinder 3 performs the action of tensioning the steel wire rope.
When the pressure sensor detects that the oil supply pressure reaches the preset pressure value, the pressure cut-off valve 1 is controlled to be powered on, and the second oil port B of the pressure cut-off valve 11And a third oil port T1Connected through a first oil port P1At the moment, the hydraulic oil provided by the hydraulic pump 4 cannot continuously pass through the pressure cut-off valve 1 to reach the rod cavity of the pull rope oil cylinder 3, and the pressure in the rod cavity and the rodless cavity in the pull rope oil cylinder 3 is preset pressure and is kept by the hydraulic lock 2.
As shown in fig. 2, in the embodiment of the present invention, a working condition switching valve 5 is disposed between the hydraulic pump 4 and the pressure cutoff valve 1, and is used for switching a rope tightening working condition and a rope loosening working condition of the rope pulling cylinder 3. It should be noted that the working condition switching valve 5 provided by the present invention may also be replaced by a three-position four-way electromagnetic directional valve 10 in the prior art to switch between the rope tightening working condition and the rope loosening working condition of the rope pulling cylinder 3, and the specific switching manner is not described herein again.
The working condition switching valve 5 provided in the above embodiment at least includes four oil ports, and the first oil port P of the working condition switching valve 52A second oil port Q communicated with the hydraulic pump 41The first oil port P of the pressure cut-off valve 11Connected, the third oil port Q2The second oil port A of the hydraulic lock 22A fourth oil port T2Communicating with the tank 6.
The operating condition switching valve 5 at least comprises two operating positions, as shown in fig. 2, when the valve core of the operating condition switching valve 5 is at the first position, the first oil port P of the operating condition switching valve 52And the second oil port Q1Connected, the third oil port Q2And a fourth oil port T2The pressure oil provided by the hydraulic pump 4 flows into the first port P of the working condition switching valve 5 at the moment2And passes through the second oil port Q1First port P of inflow pressure cut-off valve 11Oil return from the oil port A of the hydraulic lock 22Third oil port Q of inflow working condition switching valve 52And passes through the fourth oil port T2Flows into the oil tank 6.
As shown in fig. 4, when the spool of the operating condition switching valve 5 is at the second position, the first port P of the operating condition switching valve 52And the third oil port Q2Connected through, the second oil port Q1And a fourth oil port T2The pressure oil provided by the hydraulic pump 4 flows into the first port P of the working condition switching valve 5 at the moment2And passes through the third oil port Q2Oil port A of inflow hydraulic lock 22And enters a rodless cavity of the pull rope oil cylinder 3, and return oil is from an oil port A of the hydraulic lock 21Second port B of inflow pressure cut-off valve 11And passes through the fourth oil port P4Flows into the oil tank 6.
Further, when the operating mode switching valve 5 is in a normal state, the valve core is in the first position due to the action of the spring, and the first oil port P of the operating mode switching valve 52And the second oil port Q1Connected, the third oil port Q2And a fourth oil port T2And when the rope is tightened, the pressurizing action handle is required to be operated, and the three-position four-way reversing valve is required to be adjusted to a pressurizing working position from a middle position.
Further, the working condition switching valve 5 provided by the invention can be a two-position four-way manual reversing valve or a two-position four-way electromagnetic reversing valve.
When the working condition switching valve 5 is a two-position four-way manual reversing valve and the rope pulling oil cylinder 3 is in a rope tightening working condition, the valve core of the working condition switching valve 5 is in a normal state and is in a first position; when the rope pulling oil cylinder 3 is in the rope loosening working condition, the valve core of the working condition switching valve 5 is manually shifted to the second position, and the valve core is shifted to the first position after the rope loosening is finished.
When the working condition switching valve 5 is a two-position four-way electromagnetic directional valve, if the rope pulling oil cylinder 3 is in a rope tightening working condition, the valve core of the working condition switching valve 5 is in a normal state and is in a first position; if the rope pulling oil cylinder 3 is in a rope loosening working condition, the working condition switching valve 5 is powered on, the valve core moves to the second position, the working condition switching valve 5 is powered off after rope loosening is finished, and the working condition switching valve 5 automatically returns to the first position under the action of spring tension.
Further, when the rope pulling oil cylinder 3 is in a rope releasing working condition, the pressure oil output by the hydraulic pump 4 is 30-45 bar, and when the pressure of the pressure oil is 30-45 bar, the hydraulic lock 2 can be opened, so that the pressure oil flows to a rod cavity from a rodless cavity of the rope pulling oil cylinder 3, and a piston rod extends out, so that rope releasing of the steel wire rope is realized. Meanwhile, the pressure oil in the pressure range is not enough to continuously push the piston rod of the rope pulling oil cylinder to move after the rope pulling oil cylinder 3 loosens the rope, so that the phenomenon that the steel wire rope is too loosened to be separated from the pulley groove can be avoided.
The embodiment of the invention also discloses a rotary drilling rig with the hydraulic system. Due to the hydraulic system, all technical effects of the hydraulic system are achieved, and the details are not repeated herein.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of the invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A hydraulic system comprises a pull rope oil cylinder (3) with a hydraulic lock (2) and a hydraulic pump (4) for supplying oil to the pull rope oil cylinder (3), and is characterized by further comprising a pressure cut-off valve (1);
a first oil port of the pressure cut-off valve (1) is communicated with the hydraulic pump (4), and a second oil port of the pressure cut-off valve (1) is communicated with a rod cavity of the pull rope oil cylinder (3) through a first one-way valve of the hydraulic lock (2);
when the tension force of the pull rope oil cylinder (3) is smaller than a preset value, a first oil port and a second oil port of the pressure cut-off valve (1) are communicated;
and when the tension force of the rope pulling oil cylinder (3) reaches a preset value, the first oil port and the second oil port of the pressure stop valve (1) are cut off.
2. The hydraulic system according to claim 1, wherein the pressure cut-off valve (1) is a normally open hydraulic control valve, a hydraulic control port of the pressure cut-off valve (1) is communicated with a first oil port of the pressure cut-off valve (1), and when the pressure of the hydraulic control port of the pressure cut-off valve (1) reaches a preset pressure, the tension force of the pull rope cylinder (3) reaches a preset value.
3. The hydraulic system as claimed in claim 2, wherein the pressure cut-off valve (1) is a normally open hydraulic control reversing valve, and a third oil port of the pressure cut-off valve (1) is communicated with an oil tank (6);
when the pressure of a hydraulic control port of the pressure cut-off valve (1) is smaller than the preset pressure, a first oil port and a second oil port of the pressure cut-off valve (1) are communicated, and a third oil port of the pressure cut-off valve (1) is cut off;
when the pressure of the hydraulic control port of the pressure stop valve (1) reaches the preset pressure, the second oil port and the third oil port of the pressure stop valve (1) are communicated, and the first oil port of the pressure stop valve (1) is stopped.
4. The hydraulic system according to claim 1, further comprising a pressure sensor for detecting a supply pressure on a rod cavity supply line of the pull-cord cylinder (3);
when the oil supply pressure is smaller than a preset pressure value, the tension of the rope pulling oil cylinder (3) is smaller than a preset value;
and when the oil supply pressure reaches a preset pressure value, the tensioning force of the rope pulling oil cylinder (3) reaches a preset value.
5. The hydraulic system according to claim 4, characterized in that the pressure cut-off valve (1) is a solenoid directional valve, and a third oil port of the pressure cut-off valve (1) is communicated with the oil tank (6);
when the oil supply pressure is smaller than a preset pressure value, the pressure cut-off valve (1) is powered off, a first oil port and a second oil port of the pressure cut-off valve (1) are communicated, and a third oil port of the pressure cut-off valve (1) is cut off;
when the oil supply pressure reaches a preset pressure value, the pressure cut-off valve (1) is powered on, a second oil port and a third oil port of the pressure cut-off valve (1) are communicated, and a first oil port of the pressure cut-off valve (1) is cut off.
6. A hydraulic system as claimed in any one of claims 1 to 5, characterized in that a working condition switching valve (5) for switching the pull-cord cylinder (3) between a tight-cord working condition and a slack-cord working condition is arranged between the hydraulic pump (4) and the pressure cut-off valve (1);
a first oil port of the working condition switching valve (5) is communicated with the hydraulic pump (4), a second oil port of the working condition switching valve (5) is communicated with a first oil port of the pressure stop valve (1), a third oil port of the working condition switching valve (5) is communicated with a rodless cavity of the rope pulling oil cylinder (3) through a second one-way valve of the hydraulic lock (2), and a fourth oil port of the working condition switching valve (5) is communicated with the oil tank (6);
when the valve core of the working condition switching valve (5) is located at a first position, a first oil port and a second oil port of the working condition switching valve (5) are communicated, and a third oil port and a fourth oil port are communicated;
when the valve core of the working condition switching valve (5) is located at the second position, the first oil port and the third oil port of the working condition switching valve (5) are communicated, and the second oil port and the fourth oil port are communicated.
7. A hydraulic system as claimed in claim 6, characterised in that the operating mode switching valve (5) is normally such that the spool is in the first position.
8. The hydraulic system as claimed in claim 7, characterized in that the operating mode switching valve (5) is a two-position four-way manual switching valve or a two-position four-way electromagnetic switching valve.
9. The hydraulic system as claimed in claim 6, characterized in that the hydraulic pump (4) outputs a pressure oil pressure of 30-45 bar when the pull-rope cylinder (3) is in a rope-releasing condition.
10. A rotary drilling rig comprising a hydraulic system, wherein the hydraulic system is according to any one of claims 1-9.
CN202111479163.9A 2021-12-06 2021-12-06 Hydraulic system and rotary drilling rig Pending CN113983022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111479163.9A CN113983022A (en) 2021-12-06 2021-12-06 Hydraulic system and rotary drilling rig

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111479163.9A CN113983022A (en) 2021-12-06 2021-12-06 Hydraulic system and rotary drilling rig

Publications (1)

Publication Number Publication Date
CN113983022A true CN113983022A (en) 2022-01-28

Family

ID=79733335

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111479163.9A Pending CN113983022A (en) 2021-12-06 2021-12-06 Hydraulic system and rotary drilling rig

Country Status (1)

Country Link
CN (1) CN113983022A (en)

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