CN115596726A - Hydraulic system for driving brake lever of drilling winch and drilling speed control method - Google Patents

Hydraulic system for driving brake lever of drilling winch and drilling speed control method Download PDF

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Publication number
CN115596726A
CN115596726A CN202211289305.XA CN202211289305A CN115596726A CN 115596726 A CN115596726 A CN 115596726A CN 202211289305 A CN202211289305 A CN 202211289305A CN 115596726 A CN115596726 A CN 115596726A
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CN
China
Prior art keywords
valve
oil
oil cylinder
brake
emergency
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Pending
Application number
CN202211289305.XA
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Chinese (zh)
Inventor
刘忱
杨自升
李海旭
严峰
王连洋
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Beijing Jiejiexi Petroleum Equipment Co ltd
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Beijing Jiejiexi Petroleum Equipment Co ltd
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Priority to CN202211289305.XA priority Critical patent/CN115596726A/en
Publication of CN115596726A publication Critical patent/CN115596726A/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a hydraulic system for driving a brake crank of a drilling winch and a drilling speed control method, which comprise an emergency oil cylinder, a brake oil cylinder, a hydraulic station, a safety valve bank, a load sensitive valve bank, a speed sensor and a pressure sensor, wherein the emergency oil cylinder is connected with the brake oil cylinder; an oil inlet of the load sensitive valve group is communicated with an oil discharge port of the hydraulic station, a first working oil port and a second working oil port of the load sensitive valve group are respectively communicated with a rod cavity and a rodless cavity of the brake oil cylinder, and the oil discharge port of the load sensitive valve group is communicated with an oil return port of the hydraulic station; the pressure sensor is used for detecting the pressure of a rodless cavity of the brake oil cylinder. The emergency brake device drives the piston rods of the emergency oil cylinder and the brake oil cylinder through the hydraulic system to control the deflection angle of the brake crank, so that the emergency brake of the well drilling winch or the rotation speed of a roller of the well drilling winch can be realized; and in the drilling process of the drilling winch, closed-loop control can be formed among the speed sensor, the pressure sensor and the load sensitive pressure reducing valve, so that the drilling speed of the drilling winch can be accurately controlled.

Description

Hydraulic system for driving brake lever of drilling winch and drilling speed control method
Technical Field
The invention relates to the technical field of petroleum drilling equipment, in particular to a hydraulic system for driving a brake crank of a drilling winch and a drilling speed control method.
Background
The oil rig winch is a device used for oil and gas well drilling operation, and the speed of a drill bit and a drilling tool fed into the oil rig winch needs to be adjusted according to actual conditions in the process of conveying the drill bit and the drilling tool.
At present, the newer drilling winch equipment often uses hydraulic disc brakes or electric brakes to adjust the speed of the drum of the drilling winch and thus the speed at which the drilling winch delivers the drill bit and the drilling tool. With some old drilling winch arrangements, the speed of the drum of the drilling winch is still adjusted by means of the brake lever and the brake band. During the process of conveying the drill bit by the drilling winch, an operator needs to brake the drilling winch completely or adjust the speed of conveying the drill bit by the drilling winch. In the process of lifting the drill bit, the drill bit does not work, so the lifting speed can be faster, and the precision requirement of the lifting speed is not high. And the in-process is transferred to the drill bit, because need adjust the speed of drill bit according to operating condition to prevent that the drill bit from being damaged, because operating personnel makes according to experience operation brake lever in order to adjust the speed of carrying the drill bit, therefore speed control accuracy is low.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a hydraulic system for driving a brake lever of a drilling winch and a drilling speed control method, which solve the technical problems of low accuracy of bit speed control caused by manually operating the brake lever to adjust the speed of a drill bit conveyed by the drilling winch.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the hydraulic system for driving the brake crank of the drilling winch comprises an emergency oil cylinder, a brake oil cylinder, a hydraulic station, a safety valve bank, a load sensitive valve bank, a speed sensor and a pressure sensor;
a piston rod of the emergency oil cylinder is connected with the fixed end of the brake oil cylinder, and a rodless cavity of the emergency oil cylinder is communicated with an oil return port of the hydraulic station;
an oil inlet of the safety valve group is communicated with an oil discharge port of the hydraulic station, and a working oil port of the safety valve group is communicated with a rod cavity of the emergency oil cylinder;
an oil inlet of the load-sensitive valve group is communicated with an oil discharge port of the hydraulic station, a first working oil port and a second working oil port of the load-sensitive valve group are respectively communicated with a rod cavity and a rodless cavity of the brake oil cylinder, and the oil discharge port of the load-sensitive valve group is communicated with an oil return port of the hydraulic station;
the pressure sensor is used for detecting the pressure of a rodless cavity of the brake oil cylinder;
the speed sensor is used for detecting the speed of the drill bit conveyed by the drilling winch.
A drilling speed control method is characterized in that a hydraulic system used in the drilling speed control method is the hydraulic system in the scheme, the safety valve bank comprises a first state and a second state, and the load-sensitive valve bank comprises a first working position, a second working position and a third working position;
the method comprises the following steps:
s1, judging the working mode of a hydraulic system: an emergency braking mode, a drilling winch bit lowering mode and a drilling winch bit lifting mode;
s2, if the drilling winch is in a drill bit lifting mode, the safety valve bank is in a first state, the load sensitive valve bank is in a first working position, a piston rod of the emergency oil cylinder is completely shortened, and a piston rod of the brake oil cylinder is completely shortened or shortened to a preset length;
if the emergency braking mode is adopted, the safety valve bank is in a second state, the load sensitive valve bank is in a second working position, a piston rod of the emergency oil cylinder is fully extended, and a piston rod of the braking oil cylinder is fully shortened;
if the drilling winch is in a drill bit lowering mode, the safety valve bank is in a first state, the load sensitive valve bank is in a third working position, a piston rod of the emergency oil cylinder is completely shortened, and a piston rod of the brake oil cylinder extends to a preset length;
s21, judging whether the detected speed of the drilling winch for conveying the drill bit is consistent with a preset speed or not when the drilling winch is in a drill bit lowering mode;
s211, if yes, continuously conveying the drill bit at the current speed;
if not, judging whether the detected speed of the drill bit conveyed by the drilling winch is greater than the preset speed again;
s212, if not, increasing the pressure of an oil outlet of the load sensitive valve group, and extending a piston rod of the brake oil cylinder;
if yes, reducing the pressure of an oil outlet of the load sensitive valve group, and shortening a piston rod of the brake oil cylinder;
and S213, executing the steps S21 to S212 until the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is consistent with the preset speed.
Preferably, the first and second electrodes are formed of a metal,
the hydraulic system comprises a controller, the load sensitive valve group comprises an electromagnetic proportional pressure reducing valve, and the electromagnetic proportional pressure reducing valve is electrically connected with the controller;
in step S211, when the speed of the drill bit conveyed by the drilling winch, which is detected by the speed sensor, is greater than a preset speed, the controller adjusts the opening of the valve port of the electromagnetic proportional pressure reducing valve to increase the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve;
in step S211, when the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is lower than a preset speed, the controller adjusts the opening of the valve port of the electromagnetic proportional pressure reducing valve to reduce the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve.
Preferably, the load-sensitive valve group further comprises a first reversing valve and a second reversing valve;
a first oil inlet of the first reversing valve is communicated with an oil discharge port of the hydraulic station, a second oil inlet of the first reversing valve is communicated with an oil discharge port of the electromagnetic proportional pressure reducing valve, a working oil port of the first reversing valve is communicated with an oil inlet of the second reversing valve, and the first reversing valve is a two-position four-way reversing valve;
an oil discharge port of the second reversing valve is communicated with an oil return port of the hydraulic station, two working oil ports of the second reversing valve are respectively communicated with a rod cavity of the brake oil pump and a rodless cavity of the brake oil pump, the second reversing valve is a two-position three-way reversing valve, and the second reversing valve comprises a second reversing valve left position and a second reversing valve right position;
in the step S2, when a valve port of the electromagnetic proportional pressure reducing valve is opened, the first reversing valve is positioned at the right position of the first reversing valve, and the second reversing valve is positioned at the left position of the second reversing valve, the load sensitive valve bank is positioned at a third working position;
in the step S2, a valve port of the electromagnetic proportional pressure reducing valve is opened, the first reversing valve is positioned at the right position of the first reversing valve, and the load sensitive valve bank is positioned at a first working position when the second reversing valve is positioned at the right position of the second reversing valve;
in the step S2, when the valve port of the electromagnetic proportional pressure reducing valve is closed, the first directional valve is in the left position of the first directional valve, and the second directional valve is in the left position of the second directional valve, the load sensitive valve group is in the second working position.
Preferably, the first and second electrodes are formed of a metal,
a disc spring is sleeved on a piston rod of the emergency oil cylinder, one end of the disc spring is connected with a cylinder body of the emergency oil cylinder, and the other end of the disc spring is connected with the piston rod of the emergency oil cylinder;
in the step S2, when the safety valve group is in a first state, the disc spring is in a compressed and energy-storing state;
when the safety valve is in the second state, the disc spring is in a release state.
Preferably, the first and second electrodes are formed of a metal,
the hydraulic system for driving the brake crank of the drilling winch further comprises a parking valve group, a working oil port of the parking valve group is communicated with a rod cavity of the emergency oil cylinder, an oil inlet of the parking valve group is communicated with an oil discharge port of the safety valve group, and an oil discharge port of the parking valve group is communicated with an oil return port of the hydraulic station;
the parking valve group comprises a parking valve group left position and a parking valve group right position;
in the step S2, when the safety valve group is in a first state and the parking valve group is in the left position of the parking valve group, hydraulic oil enters a rod cavity of the emergency oil cylinder, a piston rod of the emergency oil cylinder is shortened, and the disc spring is compressed and stores energy;
in the step S2, when the safety valve group is in the second state and the parking valve group is in the right position of the parking valve group, hydraulic oil in a rod cavity of the emergency oil cylinder flows to an oil return port of the hydraulic station, elastic potential energy of the disc spring is released, and a piston rod of the emergency oil cylinder is driven to extend to perform emergency braking on the drilling winch.
Preferably, the first and second liquid crystal display panels are,
the hydraulic system for driving the brake lever of the drilling winch further comprises a pneumatic control system for switching the safety valve group between a first state and a second state;
in step S2, the pneumatic control system drives the safety valve set to switch between a first state and a second state.
Preferably, the first and second liquid crystal display panels are,
the hydraulic system for driving the brake crank of the drilling winch further comprises a manual oil pump, an oil inlet of the manual oil pump is communicated with an oil discharge port of the hydraulic station, and the oil discharge port of the manual oil pump can be communicated with a rod cavity of the emergency oil cylinder;
and S22, after emergency braking, rotating the manual oil pump to enable hydraulic oil to enter a rod cavity of the emergency oil cylinder, so that a piston rod of the emergency oil cylinder is shortened, the disc spring is compressed and stores energy, and the emergency braking is released.
(III) advantageous effects
The invention has the beneficial effects that:
1. the emergency brake device drives the piston rods of the emergency oil cylinder and the brake oil cylinder through the hydraulic system to control the deflection angle of the brake crank, so that the emergency brake of the well drilling winch or the rotation speed of a roller of the well drilling winch can be realized; and in the drilling process of the drilling winch, closed-loop control can be formed among the speed sensor, the pressure sensor and the load sensitive pressure reducing valve, so that the drilling speed of the drilling winch can be accurately controlled.
2. According to the emergency braking device, the emergency oil cylinder can be used for rapidly rotating the brake crank to emergently brake the drum of the drilling brake in an emergency situation, so that the safety of drilling operation is ensured.
3. According to the invention, the piston rod of the emergency oil cylinder after emergency braking can be shortened through the manual oil pump, and the speed of the drum of the drilling brake can be adjusted through manually operating the brake lever before the hydraulic system is recovered to be normal, so that the normal operation of drilling is ensured.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system of a brake band for driving a winch of a drilling machine in embodiment 1 of the present invention;
fig. 2 is a schematic combination diagram of an emergency cylinder, a brake cylinder and a brake lever in embodiment 1 of the present invention;
fig. 3 is a sectional view of an emergency cylinder, a brake cylinder and a brake lever in embodiment 1 of the present invention;
FIG. 4 is a flow chart of example 2 of the present invention.
[ description of reference ]
2: a safety valve bank; 3: a load sensitive valve bank; 8: a first direction change valve; 9: an air source triple piece; 10: a second directional control valve; 20: a third directional control valve; 22: a first check valve; 23: an electromagnetic proportional pressure reducing valve; 24: a first direction change valve; 25: a second directional control valve; 26: a pressure sensor; 27: a parking valve set; 29: a manual oil pump; 31: an emergency oil cylinder; 32: a disc spring; 33: a brake cylinder; 34: a brake lever.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 3, the hydraulic system for driving the brake crank of the drilling winch comprises an emergency cylinder 31, a brake cylinder 33, a hydraulic station, a safety valve bank 2, a load-sensitive valve bank 3, a speed sensor and a pressure sensor 26.
In this embodiment, the hydraulic station includes a hydraulic pump and a hydraulic pump.
A piston rod of the emergency oil cylinder 31 is connected with the fixed end of the brake oil cylinder 33, and a rodless cavity of the emergency oil cylinder 31 is communicated with an oil return port of the hydraulic station.
An oil inlet of the safety valve group is communicated with an oil discharge port of the hydraulic station, and a working oil port of the safety valve group is communicated with a rod cavity of the emergency oil cylinder 31.
An oil inlet of the load-sensitive valve group 3 is communicated with an oil discharge port of the hydraulic station, a first working oil port of the load-sensitive valve group is communicated with a rod cavity of the brake oil cylinder 33, a second working oil port of the load-sensitive valve group 3 is communicated with a rodless cavity of the brake oil cylinder 33, and an oil discharge port of the load-sensitive valve group 3 is communicated with an oil return port of the hydraulic station;
the pressure sensor is used to detect the pressure of the rodless chamber of the brake cylinder 33.
The speed sensor is used for detecting the speed of the drill bit conveyed by the drilling winch.
The safety valve group comprises a first state and a second state, and the load-sensitive valve group 3 comprises a first working position, a second working position and a third working position.
When the drill bit is lifted up by the drilling winch, the drill bit is in a non-working state, namely no load is applied to the drill bit, the requirement on the speed of the drill bit is not high, at the moment, the safety valve bank is in a first state, the load sensitive valve bank 3 is in a first working position, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 is completely shortened or shortened to a preset length, the piston rod of the brake oil cylinder 33 drives the brake lever to face, and the brake lever 34 rotates in the direction of reducing the braking force applied to the roller of the drilling winch, so that the speed of lifting up the drill bit by the drilling winch is increased to a preset value.
When the hydraulic system fails or the drill bit fails during working, the drill bit needs to be stopped to move, at the moment, the safety valve bank 2 is in a second state, the load sensitive valve bank 3 is in a second working position, the piston rod of the emergency oil cylinder 31 is fully extended, the piston rod of the brake oil cylinder 33 is fully shortened, and the piston rod of the brake oil cylinder 33 drives the brake lever to face, so that the brake lever 34 rotates in the direction of increasing the brake force applied to the roller of the drilling winch, and the drilling winch is emergently braked.
When the drill bit is lowered by the drilling winch, namely the drill bit is in a working state, the drill bit has a load effect, the underground structure is complex, for example, hard rock or loose soil exists, different structures need to be drilled at different drilling speeds, otherwise, the drill bit can be damaged, and therefore the speed of the drill bit needs to be accurately controlled. When a drill bit is lowered down by the drilling winch, the safety valve group 2 is in a first state, the load sensitive valve group 3 is in a third working position, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 extends to a preset length, the piston rod of the brake oil cylinder 33 drives the brake lever to face, the brake lever 34 rotates in the direction of increasing the brake force applied to the roller of the drilling winch, and therefore the speed of lowering the drill bit by the drilling winch is reduced to a preset value.
In this embodiment, the emergency braking is required in some cases: the hydraulic system cannot build pressure (damage of the hydraulic station or oil leakage of a pipeline and the like), the pressure of the hydraulic system is lower than 2.5MPa (the pressure of an overflow valve is lower than a preset value or damage), the hydraulic system is powered off, and a lifted heavy object moves to the highest point or the lowest point, and the like.
Example 2
As shown in fig. 1 to 4, in a drilling rate control method, a hydraulic system used in the drilling rate control method is the hydraulic system in embodiment 1, a relief valve group 2 includes a first state and a second state, and a load-sensitive valve group 3 includes a first operating position, a second operating position, and a third operating position.
The method comprises the following steps:
s1, judging the working mode of a hydraulic system: an emergency braking mode, a drilling winch down bit mode, and a drilling winch up bit mode.
S2, if the drilling winch lifting mode is adopted, the safety valve group 2 is in the first state, the load sensitive valve group 3 is in the first working position, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 is completely shortened or shortened to a preset length, the piston rod of the brake oil cylinder 33 drives the brake handle to face, the brake force exerted on the roller of the drilling winch by the brake handle 34 is reduced, and the brake handle rotates in the direction, so that the speed of lifting the drill bit by the drilling winch is increased to a preset value.
If the emergency braking mode is adopted, the safety valve group 2 is in the second state, the load sensitive valve group 3 is in the second working position, the piston rod of the emergency oil cylinder 31 is fully extended, the piston rod of the brake oil cylinder 33 is fully shortened, the piston rod of the brake oil cylinder 33 drives the brake crank 34 to face, and the brake crank 34 rotates in the direction of increasing the braking force applied to the roller of the drilling winch, so that the drilling winch is emergently braked.
If the drilling winch is in a drill bit lowering mode, the safety valve group 2 is in the first state, the load sensitive valve group 3 is in the third working position, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 extends to a preset length, the piston rod of the brake oil cylinder 33 drives the brake lever to face, the brake lever 34 rotates in the direction of increasing the brake force applied to the roller of the drilling winch, and the speed of lowering the drill bit of the drilling winch is reduced to a preset value.
S21, judging whether the detected speed of the drilling winch for conveying the drill bit is consistent with the preset speed or not when the drilling winch is in the drill bit lowering mode.
And S211, if so, continuously conveying the drill bit at the current speed.
If not, judging whether the detected speed of the drill bit conveyed by the drilling winch is greater than the preset speed again.
S212, if not, increasing the pressure of an oil outlet of the load sensitive valve group 3, extending a piston rod of the brake oil cylinder 33, and reducing the speed of conveying a drill bit by the drilling winch.
If yes, reducing the pressure of an oil outlet of the load sensitive valve group 3, and shortening a piston rod of the brake oil cylinder 33;
and S213, executing the steps S21 to S212 until the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is consistent with the preset speed.
Further, the hydraulic system comprises a controller, the load sensitive valve group 3 comprises an electromagnetic proportional pressure reducing valve, the electromagnetic proportional pressure reducing valve 23 is electrically connected with the controller, and an oil outlet of the load sensitive valve group 3 can be communicated with a rodless cavity of the brake oil cylinder 33.
In step S211, when the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is greater than the preset speed, the controller adjusts the opening of the valve port of the electromagnetic proportional pressure reducing valve 23 to increase the pressure at the oil outlet of the electromagnetic proportional pressure reducing valve 23 。
In step S211, when the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is lower than the preset speed, the controller adjusts the opening of the valve port of the electromagnetic proportional pressure reducing valve 23 to reduce the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve 23.
In this embodiment, since the load sensitive valve group 3 can be communicated with the rodless cavity of the brake cylinder 33, the pressure of the oil outlet of the load sensitive valve group 3 is the pressure of the rodless cavity of the brake cylinder 33, and thus the pressure of the rodless cavity of the brake cylinder 33 can be adjusted by adjusting the pressure of the oil outlet of the load sensitive valve group 3.
The thrust F = π R of the piston rod of the brake cylinder 33 2 P；
Where R is the radius of the piston of the brake cylinder 33.
P-the pressure exerted on the piston of the brake cylinder 33, i.e. the pressure of the rodless chamber of the brake cylinder 33.
From the above formula, the thrust of the rodless cavity of the brake cylinder 33 is in direct proportion to the pressure of the piston rod of the brake cylinder 33, and the pressure of the rodless cavity of the brake cylinder 33 is changed, i.e. the force of the piston rod of the brake cylinder 33 pushing the brake lever, i.e. the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve 23, i.e. the force of the piston of the brake cylinder 33 pushing the brake lever, so as to change the braking force of the brake lever 34 applied to the drum of the drilling winch, thereby adjusting the speed of lowering the drill bit of the drilling winch.
In this embodiment, the load-sensitive valve group 3 further comprises a first direction valve 24 and a second direction valve 25. A first oil inlet of the first reversing valve 24 is communicated with an oil discharge port of the hydraulic station, a second oil inlet of the first reversing valve 24 is communicated with an oil discharge port of the electromagnetic proportional pressure reducing valve 23, a working oil port of the first reversing valve 24 is communicated with an oil inlet of the second reversing valve 25, and the first reversing valve 24 is a two-position four-way reversing valve;
an oil discharge port of the second reversing valve 25 is communicated with an oil return port of the hydraulic station, two working oil ports of the second reversing valve 25 are respectively communicated with a rod cavity of the brake oil cylinder 33 and a rodless cavity of the brake oil cylinder 33, the second reversing valve 25 is a two-position three-way reversing valve, and the second reversing valve 25 comprises a second reversing valve left position and a second reversing valve right position.
In this embodiment, a second pilot oil path for controlling the reversing of the second reversing valve 25 is communicated with an oil discharge port of the safety valve group 2, and a spring cavity of the second reversing valve 25 is communicated with an oil return port of the hydraulic station.
In step S2, when the valve port of the electromagnetic proportional pressure reducing valve 23 is opened, the first directional valve 24 is at the right position of the first directional valve, and the second directional valve is at the left position of the second directional valve 25, the load sensitive valve group 3 is at the third working position. Hydraulic oil sequentially enters a rodless cavity of the brake cylinder 33 through an oil port of the electromagnetic proportional pressure reducing valve 23, the right position of the first reversing valve 24 and the left position of the second reversing valve 25, so that the brake crank 34 rotates towards the direction in which the braking force exerted on the roller of the drilling winch by the brake crank 34 is increased, and the speed of conveying the drill bit by the drilling winch is reduced to a preset value or the conveying of the drill bit is stopped.
In step S2, when the valve port of the electromagnetic proportional pressure reducing valve 23 is opened, the first directional valve 24 is in the right position of the first directional valve, and the second directional valve 25 is in the right position of the second directional valve, the load sensitive valve group 3 is in the first working position. The hydraulic oil enters the rod cavity of the brake cylinder 33 through the oil outlet of the electromagnetic proportional pressure reducing valve 23, the right position of the first reversing valve and the right position of the second reversing valve in sequence, so that the brake lever 34 rotates towards the direction of reducing the braking force applied to the roller of the drilling winch by the brake lever, and the speed of conveying the drill bit by the drilling winch is increased by a preset value.
In step S2, when the valve port of the electromagnetic proportional pressure reducing valve 23 is closed, the first direction valve 24 is at the left position of the first direction valve, and the second direction valve 25 is at the left position of the second direction valve, the load sensitive valve group 3 is at the second working position.
In this embodiment, a disc spring 32 is sleeved on a piston rod of the emergency oil cylinder 31, one end of the disc spring 32 is connected with the cylinder body of the emergency oil cylinder 31, and the other end of the disc spring is connected with the piston rod of the emergency oil cylinder 31.
In step S2, when the safety valve set 2 is in the first state, the disc spring 32 is in a compressed and energy-storing state; the hydraulic oil enters the rod cavity of the emergency oil cylinder 31 through the safety valve group 2, and under the action of the hydraulic oil, the piston rod of the emergency oil cylinder 31 drives the disc spring 32 to move and compress for energy storage.
When the safety valve group 2 is in the second state, the disc spring 32 is in a release state, hydraulic oil in a rod cavity of the emergency oil cylinder 31 flows back to an oil return port of the hydraulic station through the safety valve group 2, the elastic potential energy of the disc spring 32 is released and drives a piston of the emergency oil cylinder 31 to extend to perform emergency braking on the drilling winch, at the moment, the hydraulic oil in the brake oil cylinder 31 sequentially flows back to the oil return port of the hydraulic station through the left position of the first reversing valve and the left position of the second reversing valve, and a piston rod of the brake oil cylinder 31 is completely retracted into a cylinder body of the brake oil cylinder.
In this embodiment, the hydraulic system for driving the brake lever 34 of the drilling winch further includes a parking valve group 27, a working oil port of the parking valve group 27 is communicated with a rod cavity of the emergency oil cylinder 31, an oil inlet of the parking valve group 27 is communicated with an oil discharge port of the safety valve group, and an oil discharge port of the parking valve group 27 is communicated with an oil return port of the hydraulic station.
The parking valve block 27 includes a parking valve block left position and a parking valve block right position.
In step S2, when the safety valve group is in the first state and the parking valve group 27 is in the left position of the parking valve group, the hydraulic oil enters the rod cavity of the emergency oil cylinder 31, the piston rod of the emergency oil cylinder 31 is shortened, and the disc spring 32 is compressed and stores energy.
In step S2, when the safety valve group 2 is in the second state and the parking valve group 27 is in the right position of the parking valve group, the hydraulic oil in the rod cavity of the emergency oil cylinder 31 flows to the oil return port of the hydraulic station, the elastic potential energy of the disc spring 32 is released, and the piston rod of the emergency oil cylinder 31 is driven to extend to perform emergency braking on the drilling winch.
The hydraulic system for driving the brake lever of the drilling winch used in the present embodiment also comprises a pneumatic control system for switching the safety valve group 2 between the first state and the second state;
in step S2, the pneumatic control system drives the relief valve set to switch between the first state and the second state.
In this embodiment, the pneumatic control system includes that the pneumatic control system includes air pump, third switching valve 8, air supply trigeminy piece 9 and fourth switching valve 10.
An air inlet of the third reversing valve 8 is communicated with an air outlet of the air pump, and an air outlet of the third reversing valve 8 is communicated with an air inlet of the air source triple piece 9.
In this embodiment, the third directional valve 8 is a manual directional valve, the third directional valve 8 is a two-position three-way valve, the third directional valve 8 includes a first directional valve left position and a first directional valve right position, the third directional valve 8 is always in the third directional valve left position, that is, the air pump is always communicated with the air source triple 9.
An air inlet of the fourth reversing valve 10 is communicated with an air outlet of the air source triple piece 9, and an air outlet end of the fourth reversing valve 10 is used for driving the safety valve group 2 to be switched between the first state and the second state. The working state of the safety valve group 2 is changed by starting the control system, even if the working state is in the first state or the second state, in this embodiment, when the exhaust port pressure of the fourth reversing valve 10 is less than 0.6MPa, the safety valve group 2 is in the second state, and when the exhaust port pressure of the second reversing valve is greater than 0.6MPa, the safety valve group is in the first state.
In this embodiment, the fourth direction valve 10 is a two-position three-way electromagnetic direction valve, and the fourth direction valve 10 includes a second direction valve left position and a second direction valve right position, and its initial position is in the second direction valve right position.
The hydraulic system for driving the brake crank of the drilling winch used in the embodiment further comprises a manual oil pump 29, an oil inlet of the manual oil pump 29 is communicated with an oil outlet of the hydraulic station, and an oil outlet of the manual oil pump 29 can be communicated with a rod cavity of the emergency oil cylinder 31.
In this embodiment, the method further includes step S22, after emergency braking, the manual oil pump 29 is rotated to enable hydraulic oil to enter the rod cavity of the emergency oil cylinder 31, so that the piston rod of the emergency oil cylinder 31 is shortened, the disc spring 32 is compressed and stores energy, and the emergency braking is released.
In this embodiment, a first check valve 22 is further disposed between the spring cavity of the electromagnetic proportional pressure reducing valve 23 and the oil return port of the hydraulic station, a liquid inlet of the first check valve 22 is communicated with the oil return port of the hydraulic station, and a liquid outlet of the first check valve 22 is communicated with the spring cavity of the proportional pressure reducing valve 23. A first pilot oil path for opening the valve port of the first check valve 22 is provided in the first check valve 22, and the first pilot oil path communicates with the drain port of the third directional valve 20. When the proportional pressure reducing valve is used, the valve port of the first check valve 22 is opened through the first pilot, and hydraulic oil in the spring cavity of the proportional pressure reducing valve 23 flows back to the oil return port of the hydraulic station.
In this embodiment, the safety valve group 2 includes a fifth directional valve 20, an oil inlet of the fifth directional valve 20 is communicated with an oil outlet of the hydraulic station, a working oil port of the fifth directional valve 20 is communicated with a rod cavity of the emergency oil cylinder 31, and an oil outlet of the fifth directional valve 20 is communicated with an oil return port of the hydraulic station.
In summary, in this embodiment, during operation, S1, determining the operating mode of the hydraulic system: an emergency braking mode, a drilling winch down bit mode, and a drilling winch up bit mode.
S2, if the drilling winch lifting mode is adopted, the safety valve group 2 is in the first state, the load sensitive valve group 3 is in the first working position, namely the first reversing valve 24 is in the right position of the first reversing valve, and the second reversing valve 25 is in the right position of the second reversing valve, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 is completely shortened or shortened to the preset length, the piston rod of the brake oil cylinder 33 drives the brake handle 34 to face, and the brake handle 34 rotates in the direction of reducing the braking force applied to the roller of the drilling winch, so that the speed of lifting the drill bit of the drilling winch is increased to the preset value.
If the emergency braking mode is adopted, the safety valve group 2 is in the second state, the load sensitive valve group 3 is in the second working position, that is, when the valve port of the electromagnetic proportional pressure reducing valve 23 is closed, the first reversing valve 24 is in the left position of the first reversing valve, and the second reversing valve 25 is in the left position of the second reversing valve, the piston rod of the emergency oil cylinder 31 is fully extended, the piston rod of the brake oil cylinder 33 is fully shortened, the piston rod of the brake oil cylinder 33 drives the brake handle 34 to face, so that the brake force exerted by the brake handle 34 on the drum of the drilling winch is increased in the direction to rotate, and the drilling winch is emergently braked.
If the drilling winch is in a drill bit lowering mode, the safety valve group 2 is in the first state, the load sensitive valve group 3 is in the third working position, namely, when the valve port of the electromagnetic proportional pressure reducing valve is opened, the first reversing valve 24 is in the right position of the first reversing valve, and the second reversing valve 25 is in the left position of the second reversing valve, the piston rod of the emergency oil cylinder 31 is completely shortened, the piston rod of the brake oil cylinder 33 extends to the preset length, the piston rod of the brake oil cylinder 33 drives the brake handle to face, and the brake force exerted on the roller of the drilling winch by the brake handle 34 is rotated in the direction of increasing, so that the speed of lowering the drill bit of the drilling winch is reduced.
S21, judging whether the detected speed of the drilling winch for conveying the drill bit is consistent with the preset speed or not when the drilling winch is in the drill bit lowering mode.
And S211, if so, continuing to convey the drill bit at the current speed.
If not, judging whether the detected speed of the drill bit conveyed by the drilling winch is greater than the preset speed again.
S212, if not, increasing the pressure of an oil outlet of the load sensitive valve group 3, namely increasing the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve 23, and extending a piston rod of the brake oil cylinder.
If yes, the pressure of the oil outlet of the load sensitive valve group 3 is reduced, namely the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve 23 is reduced, and the piston rod of the brake oil cylinder is shortened.
And S213, executing the steps S21 to S212 until the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is consistent with the preset speed.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description of the present specification, the description of "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention and that those skilled in the art may make modifications, alterations, substitutions and alterations to the above embodiments within the scope of the present invention.

Claims (8)

1. A hydraulic system for driving a brake crank of a drilling winch is characterized by comprising an emergency oil cylinder (31), a brake oil cylinder (33), a hydraulic station, a safety valve bank (2), a load-sensitive valve bank (3), a speed sensor and a pressure sensor;
a piston rod of the emergency oil cylinder (31) is connected with the fixed end of the brake oil cylinder (33), and a rodless cavity of the emergency oil cylinder (31) is communicated with an oil return port of the hydraulic station;
an oil inlet of the safety valve group (2) is communicated with an oil discharge port of the hydraulic station, and a working oil port of the safety valve group (2) is communicated with a rod cavity of the emergency oil cylinder (31);
an oil inlet of the load-sensitive valve group (3) is communicated with an oil discharge port of the hydraulic station, a first working oil port and a second working oil port of the load-sensitive valve group (3) are respectively communicated with a rod cavity and a rodless cavity of the brake oil cylinder (33), and the oil discharge port of the load-sensitive valve group (3) is communicated with an oil return port of the hydraulic station;
the pressure sensor is used for detecting the pressure of a rodless cavity of the brake oil cylinder (33);
the speed sensor is used for detecting the speed of the drill bit conveyed by the drilling winch.
2. A method for controlling the rate of penetration of a lever of a drilling winch, characterized in that the hydraulic system used in the method is the one of claim 1, the safety valve group (2) comprises a first state and a second state, and the load-sensitive valve group (3) comprises a first operating position, a second operating position and a third operating position;
the method comprises the following steps:
s1, judging the working mode of a hydraulic system: an emergency braking mode, a drilling winch bit lowering mode and a drilling winch bit lifting mode;
s2, if the drilling winch is in a drill bit lifting mode, the safety valve group (2) is in a first state, the load sensitive valve group (3) is in a first working position, a piston rod of the emergency oil cylinder (31) is completely shortened, and a piston rod of the brake oil cylinder (33) is completely shortened or shortened to a preset length;
if the emergency braking mode is adopted, the safety valve bank (2) is in a second state, the load sensitive valve bank (3) is in a second working position, a piston rod of the emergency oil cylinder (31) is fully extended, and a piston rod of the braking oil cylinder (33) is fully shortened;
if the drilling winch is in a drill bit lowering mode, the safety valve group (2) is in a first state, the load sensitive valve group (3) is in a third working position, a piston rod of the emergency oil cylinder (31) is completely shortened, and a piston rod of the brake oil cylinder (33) is extended to a preset length;
s21, judging whether the detected speed of the drilling winch for conveying the drill bit is consistent with a preset speed or not when the drilling winch is in a drill bit lowering mode;
s211, if yes, continuously conveying the drill bit at the current speed;
if not, judging whether the detected speed of the drill bit conveyed by the drilling winch is greater than the preset speed again;
s212, if not, increasing the pressure of an oil outlet of the load sensitive valve group (3), and extending a piston rod of the brake oil cylinder (33);
if yes, reducing the pressure of an oil outlet of the load sensitive valve group (3), and shortening a piston rod of a brake oil cylinder (33);
and S213, executing the steps S21 to S212 until the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is consistent with the preset speed.
3. The rate of penetration control method of claim 2,
the hydraulic system comprises a controller, the load sensitive valve bank (3) comprises an electromagnetic proportional pressure reducing valve (23), and the electromagnetic proportional pressure reducing valve (23) is electrically connected with the controller;
in step S211, when the speed of the drill bit conveyed by the drilling winch, which is detected by the speed sensor, is greater than a preset speed, the controller adjusts the opening degree of the valve port of the electromagnetic proportional pressure reducing valve (23) to increase the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve (23);
in step S211, when the speed of the drill bit conveyed by the drilling winch detected by the speed sensor is lower than a preset speed, the controller adjusts the opening degree of the valve port of the electromagnetic proportional pressure reducing valve (23) to reduce the pressure of the oil outlet of the electromagnetic proportional pressure reducing valve (23).
4. A rate control method as claimed in claim 3, wherein the load sensitive valve pack (3) further comprises a first directional valve (24) and a second directional valve (25);
a first oil inlet of the first reversing valve (24) is communicated with an oil discharge port of the hydraulic station, a second oil inlet of the first reversing valve (24) is communicated with an oil discharge port of the electromagnetic proportional pressure reducing valve (23), a working oil port of the first reversing valve (24) is communicated with an oil inlet of the second reversing valve (25), and the first reversing valve (24) is a two-position four-way reversing valve;
an oil discharge port of the second reversing valve (25) is communicated with an oil return port of the hydraulic station, two working oil ports of the second reversing valve (25) are respectively communicated with a rod cavity of the brake oil pump and a rodless cavity of the brake oil pump, the second reversing valve (25) is a two-position three-way reversing valve, and the second reversing valve (25) comprises a second reversing valve left position and a second reversing valve right position;
in the step S2, when a valve port of the electromagnetic proportional pressure reducing valve (23) is opened, the first reversing valve (24) is positioned at the right position of the first reversing valve, and the second reversing valve (25) is positioned at the left position of the second reversing valve, the load sensitive valve group (3) is positioned at a third working position;
in the step S2, when a valve port of the electromagnetic proportional pressure reducing valve (23) is opened, the first reversing valve (24) is positioned at the right position of the first reversing valve, and the second reversing valve (25) is positioned at the right position of the second reversing valve, the load sensitive valve group (3) is positioned at a first working position;
in the step S2, when a valve port of the electromagnetic proportional pressure reducing valve is closed, the first reversing valve (24) is positioned at the left position of the first reversing valve, and the second reversing valve (25) is positioned at the left position of the second reversing valve, the load sensitive valve group (3) is positioned at the second working position.
5. The rate of penetration control method of claim 2,
a disc spring (32) is sleeved on a piston rod of the emergency oil cylinder (31), one end of the disc spring (32) is connected with a cylinder body of the emergency oil cylinder (31), and the other end of the disc spring is connected with the piston rod of the emergency oil cylinder (31);
in the step S2, when the safety valve group (2) is in a first state, the disc spring (32) is in a compressed and energy-storing state;
when the safety valve (2) is in the second state, the disc spring (32) is in a release state.
6. The rate of penetration control method of claim 5,
the hydraulic system for driving the brake crank of the drilling winch further comprises a parking valve group (27), a working oil port of the parking valve group (27) is communicated with a rod cavity of the emergency oil cylinder (31), an oil inlet of the parking valve group (27) is communicated with an oil discharge port of the safety valve group, and an oil discharge port of the parking valve group (27) is communicated with an oil return port of the hydraulic station;
the parking valve group (27) comprises a parking valve group left position and a parking valve group right position;
in the step S2, when the safety valve group (2) is in a first state and the parking valve group (27) is in the left position of the parking valve group, hydraulic oil enters a rod cavity of the emergency oil cylinder, a piston rod of the emergency oil cylinder (31) is shortened, and the disc spring (32) is compressed and stores energy;
in the step S2, the safety valve group (2) is in a second state, when the parking valve group (27) is in the right position of the parking valve group, hydraulic oil in a rod cavity of the emergency oil cylinder (31) flows to an oil return port of the hydraulic station, elastic potential energy of the disc spring (32) is released, and a piston rod of the emergency oil cylinder (31) is driven to extend to perform emergency braking on the drilling winch.
7. The rate of penetration control method of claim 2,
the hydraulic system for driving the brake lever (34) of the drilling winch further comprises a pneumatic control system for switching the set of safety valves between a first state and a second state;
in step S2, the pneumatic control system drives the safety valve set to switch between a first state and a second state.
8. The rate of penetration control method according to any one of claims 5 to 7,
the hydraulic system for driving the brake crank of the drilling winch further comprises a manual oil pump (29), an oil inlet of the manual oil pump (29) is communicated with an oil outlet of the hydraulic station, and an oil outlet of the manual oil pump (29) can be communicated with a rod cavity of the emergency oil cylinder (31);
the emergency braking system is characterized by further comprising a step S22, after emergency braking, the manual oil pump (29) is rotated, hydraulic oil enters a rod cavity of the emergency oil cylinder (31), a piston rod of the emergency oil cylinder (31) is shortened, the disc spring (32) is compressed and stores energy, and emergency braking is released.
CN202211289305.XA 2022-10-20 2022-10-20 Hydraulic system for driving brake lever of drilling winch and drilling speed control method Pending CN115596726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211289305.XA CN115596726A (en) 2022-10-20 2022-10-20 Hydraulic system for driving brake lever of drilling winch and drilling speed control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211289305.XA CN115596726A (en) 2022-10-20 2022-10-20 Hydraulic system for driving brake lever of drilling winch and drilling speed control method

Publications (1)

Publication Number Publication Date
CN115596726A true CN115596726A (en) 2023-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211289305.XA Pending CN115596726A (en) 2022-10-20 2022-10-20 Hydraulic system for driving brake lever of drilling winch and drilling speed control method

Country Status (1)

Country Link
CN (1) CN115596726A (en)

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