CN114483675B - Closed electrohydraulic control system for feeding cylinder of drilling machine - Google Patents
Closed electrohydraulic control system for feeding cylinder of drilling machine Download PDFInfo
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- CN114483675B CN114483675B CN202111496832.3A CN202111496832A CN114483675B CN 114483675 B CN114483675 B CN 114483675B CN 202111496832 A CN202111496832 A CN 202111496832A CN 114483675 B CN114483675 B CN 114483675B
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- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 239000003921 oil Substances 0.000 description 119
- 238000000034 method Methods 0.000 description 12
- 230000001502 supplementing effect Effects 0.000 description 12
- 239000010720 hydraulic oil Substances 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
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- 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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
-
- 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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
- E21B44/02—Automatic control of the tool feed
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application provides a closed electrohydraulic control system of a drilling machine feeding cylinder, which comprises a power machine, a closed hydraulic pump, a first pilot proportional valve, a second pilot proportional valve and a feeding cylinder, wherein the power machine is connected with the closed hydraulic pump through a pipeline; the opening of the swash plate control oil cylinder A is respectively connected with the opening of the closed hydraulic pump A and the opening of the first shuttle valve C, and the opening of the swash plate control oil cylinder B is respectively connected with the opening of the closed hydraulic pump A and the opening of the second shuttle valve C; the first shuttle valve A is connected with the second sequence valve B, the first shuttle valve B is connected with the first pilot proportional valve A, and the second shuttle valve B is connected with the first sequence valve B.
Description
Technical Field
The application belongs to the field of electrohydraulic control of drilling equipment, and particularly relates to a closed electrohydraulic control system of a drilling machine feeding cylinder.
Background
At present, a drilling machine feeding device is controlled by an oil cylinder, a conventional drilling machine feeding control system is generally an open control system, the specification of the oil cylinder is increased along with the lifting of the drilling machine capacity, the power requirement of a hydraulic system is increased along with the lifting of the drilling machine power, and the problems of low efficiency, complex pipelines and the like of the open system are more remarkable; the closed loop volume speed regulation system is widely focused on due to higher transmission efficiency, and is applied to a drilling machine feeding system, firstly, the drilling process requires that the pressure of the drilling machine feeding system can be regulated in a larger range so as to meet the requirements of different bottom layers on the drilling pressure, the closed loop volume speed regulation system generally adopts an overflow mode, the feeding system has small flow requirement during normal drilling and works under the working condition for a long time, and most high-pressure oil overflows through an overflow valve at the moment, so that the system efficiency is low, and the purposes of energy conservation and emission reduction cannot be achieved; secondly, because the feeding system is controlled by an asymmetric oil cylinder conventionally under the capability requirement of a drilling machine, the closed loop is suitable for systems with the same flow in the forward and reverse directions, such as a bidirectional hydraulic motor or a double-rod symmetric cylinder, and the like; in the drilling process of the drilling machine, a negative load working condition can occur or pipeline pressure loss occurs, at the moment, in the closed system, an oil return port of the oil cylinder is directly connected with an oil inlet cavity of the closed pump, at the moment, the feeding device of the drilling machine can rapidly fall under the action of gravity, and personnel or equipment damage accidents are caused.
The common solution is to adopt an asymmetric design in the closed pump to realize bidirectional different flow output, and the scheme solves the problem of flow asymmetry, but in the flow regulation process, the flow matching of two oil ports of the pump is difficult. Because of adopting nonstandard design, the system has higher construction cost, and the later spare parts and maintenance are inconvenient, so the system is difficult to popularize and apply. The other method is to add a large-flow oil supplementing pump and a plurality of hydraulic elements to asymmetrically supplement oil to two cavities of the oil cylinder, and the scheme is mainly characterized in that the output flow of the oil supplementing pump is large, when the oil is supplemented at the small flow end, the oil supplementing flow is small, the redundant flow overflows completely, and the power loss of the oil supplementing pump is large. The technical scheme is that a special oil supplementing valve block is designed, when the redundant flow of the system flow is directly returned to an oil tank and oil is supplemented, the oil is directly absorbed from the oil tank through the special valve, and the scheme is only suitable for controlling a conventional asymmetric oil cylinder.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide a closed electrohydraulic control system for a feeding cylinder of a drilling machine, which solves the problems of the prior art.
In order to solve the technical problems, the application adopts the following technical scheme:
the closed electrohydraulic control system of the feeding cylinder of the drilling machine comprises a power machine, a closed hydraulic pump, a first pilot proportional valve, a second pilot proportional valve and a feeding cylinder, wherein the power machine is connected with the closed hydraulic pump through a pipeline, an A port of the closed hydraulic pump is connected with an A port of the feeding cylinder, a B port of the closed hydraulic pump is connected with a B port of the feeding cylinder, and the closed electrohydraulic control system of the feeding cylinder of the drilling machine further comprises an auxiliary pump, a second overflow valve, a swash plate control cylinder, a first shuttle valve, a second shuttle valve, a first sequence valve and a second sequence valve;
the opening of the swash plate control oil cylinder A is respectively connected with the opening of the closed hydraulic pump A and the opening of the first shuttle valve C, and the opening of the swash plate control oil cylinder B is respectively connected with the opening of the closed hydraulic pump A and the opening of the second shuttle valve C;
the first shuttle valve A is connected with the second sequence valve B, the first shuttle valve B is connected with the first pilot proportional valve A, and the second shuttle valve B is connected with the first sequence valve B;
the first pilot proportional valve P port and the second pilot proportional valve P port are connected with the auxiliary pump P port and the second overflow valve P port, and the auxiliary pump T port is connected with the second overflow valve T port; the auxiliary pump is connected with the closed hydraulic pump through a pipeline, and the port of the auxiliary pump T is connected with the port of the second overflow valve T and is connected with the pressure oil tank;
the first sequence valve A port is connected with the feeding oil cylinder A port, and the second sequence valve A port is connected with the feeding oil cylinder B port.
The drilling machine feeding cylinder closed electrohydraulic control system further comprises: the hydraulic pump comprises a first check valve, a second check valve, a first balance valve and a second balance valve, wherein a first check valve A port is connected with a closed hydraulic pump A port, a second check valve A port is connected with a closed hydraulic pump B port, and a first check valve B port and a second check valve B port are both connected with a pressure oil tank;
the first balance valve A and the second balance valve A are connected with the feed oil cylinder B, the first balance valve C and the second balance valve C are connected with the feed oil cylinder A, and the second balance valve B is connected with the pressure oil tank.
The drilling machine feeding cylinder closed electrohydraulic control system further comprises a first safety valve and a second safety valve, wherein the P port of the second safety valve is connected with the A port of the closed hydraulic pump, the P port of the first safety valve is connected with the B port of the closed hydraulic pump, and the T port of the first safety valve and the T port of the second safety valve are both connected with a pressure oil tank.
The drilling machine feeding oil cylinder closed electrohydraulic control system further comprises a flushing valve and a first overflow valve, wherein the flushing valve A port is connected with the feeding oil cylinder A port, the flushing valve B port is connected with the feeding oil cylinder B port, the flushing valve C port is connected with the first overflow valve P port, and the first overflow valve T port is connected with a pressure oil tank.
The closed hydraulic pump adopts a hydraulic proportional variable pump.
The auxiliary pump adopts a small-displacement constant displacement pump.
The first proportional pilot valve and the second proportional pilot valve adopt proportional pressure reducing overflow valves.
Compared with the prior art, the application has the following technical effects:
the closed electrohydraulic control system for the feeding cylinder of the drilling machine simplifies the system composition and has higher transmission efficiency; the application can realize the self-adaptive drilling speed requirement of the feeding and pulling speed, has simple system composition, does not need complex control, has better process adaptability, improves the drilling efficiency, has no throttling and overflow loss, is efficient and energy-saving, and simultaneously reduces the system construction cost.
The closed electrohydraulic control system for the drilling machine feeding cylinder adopts the first balance valve, the second balance valve, the first one-way valve, the second one-way valve and the pressure oil tank to form an oil leakage and oil supplementing loop, so that the problem that the asymmetric feeding cylinder is used in a closed system, a large-displacement oil supplementing pump is not required to be configured, the problem of poor oil feeding and oil returning flow of the feeding cylinder is solved, the problem that the pressure oil tank is pressurized to supplement oil, the problem that the conventional open oil tank is used for supplementing oil and is insufficient to suck air is avoided, the stability and reliability of the control system are improved, the pressure loss and falling in the oil leakage process of the feeding cylinder can be solved by the loop oil leakage and the balance loop, and the use safety of the system is improved.
And (III) the closed electrohydraulic control system for the feeding cylinder of the drilling machine can be realized by adopting conventional parts in the market, and has the advantages of simple system composition, strong universality and low development cost.
Drawings
FIG. 1 is a schematic diagram of the overall construction of a closed electro-hydraulic control system for a drilling rig feed cylinder of the present application;
FIG. 2 is a schematic diagram of the feed cylinder pressure and speed control of the present application;
FIG. 3 is a logic diagram of the adaptive control of feed cylinder speed of the present application;
FIG. 4 is a schematic diagram of an asymmetric cylinder control of the present application;
fig. 5 is a schematic diagram of the pressure tank of the present application.
The meaning of each reference numeral in the figures is:
the hydraulic system comprises a 1-power machine, a 2-closed hydraulic pump, a 3-swash plate control cylinder, a 4-first shuttle valve, a 5-first proportional pilot valve, a 6-second proportional pilot valve, a 7-second shuttle valve, an 8-first sequence valve, a 9-second sequence valve, a 10-flushing valve, an 11-feeding cylinder, a 12-first overflow valve, a 13-first balance valve, a 14-second balance valve, a 15-first check valve, a 16-second check valve, a 17-first safety valve, a 18-second safety valve, a 19-second overflow valve, a 20-auxiliary pump and a 21-pressure oil tank.
The following examples illustrate the application in further detail.
Detailed Description
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
The directional terms mentioned herein, it should be noted that the terms "upper", "lower", "left", "right", etc. indicate the operational positional relationship of the respective hydraulic valves in the hydraulic system, are based on the orientation or positional relationship shown in the drawings, only for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, 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.
Examples:
the closed electrohydraulic control system of the drilling machine feed oil cylinder comprises a power machine 1, a closed hydraulic pump 2, a first pilot proportional valve 5, a second pilot proportional valve 6 and a feed oil cylinder 11, wherein the power machine 1 is connected with the closed hydraulic pump 2 through a pipeline, a closed hydraulic pump 2A port is connected with the feed oil cylinder 11A port, a closed hydraulic pump 2B port is connected with the feed oil cylinder 11B port, the closed electrohydraulic control system of the drilling machine feed oil cylinder also comprises an auxiliary pump 20, a second overflow valve 19, a swash plate control cylinder 3, a first shuttle valve 4, a second shuttle valve 7, a first sequence valve 8 and a second sequence valve 9, the swash plate control cylinder 3A port is respectively connected with the closed hydraulic pump 2A port and the first shuttle valve 4C port, and the swash plate control cylinder 3B port is respectively connected with the closed hydraulic pump 2A port and the second shuttle valve 7C port; the first shuttle valve 4A is connected with the first sequence valve 8B, the first shuttle valve 4B is connected with the first pilot proportional valve 5A, and the second shuttle valve 7B is connected with the second sequence valve 9B; the first pilot proportional valve 5P port and the second pilot proportional valve 6P port are connected with the auxiliary pump 20P port and the second overflow valve 19P port, and the auxiliary pump 20T port is connected with the second overflow valve 19T port; the port of the auxiliary pump 20T is connected with the port of the second overflow valve 19T and is connected with the pressure oil tank 21; the first sequence valve 8A is connected with the feed oil cylinder 11A, and the second sequence valve 9A is connected with the feed oil cylinder 11B.
As shown in FIG. 1, the closed electrohydraulic control system of the feeding cylinder of the drilling machine simplifies the system composition and has higher transmission efficiency; the application can realize the self-adaptive drilling speed requirement of the feeding and pulling speed, has simple system composition, does not need complex control, has better process adaptability, improves the drilling efficiency, has no throttling and overflow loss, is efficient and energy-saving, and simultaneously reduces the system construction cost.
The power machine drives the closed hydraulic pump to control the extension and retraction of the feeding oil cylinder, the first safety valve and the second safety valve control the highest working pressure of the A, B port of the feeding oil cylinder, the flushing valve and the first overflow valve overflow partial liquid flow at the A, B port of the feeding oil cylinder so as to be partially cooled, the auxiliary pump provides a high-pressure oil source for the first proportional pilot valve and the second proportional pilot valve, the first proportional pilot valve controls the working pressure of the A port of the sloping cam plate control oil cylinder in a proportional manner so as to control the displacement of the A port of the closed hydraulic pump, control the retraction speed of the feeding oil cylinder, and the second proportional pilot valve controls the working pressure of the B port of the sloping cam plate control oil cylinder so as to control the displacement of the B port of the closed hydraulic pump and control the extension speed of the feeding oil cylinder.
And when the pressure of the A port of the feeding oil cylinder exceeds the set pressure of the first sequence valve, high-pressure oil flows through the second shuttle valve 7 to enter the B port of the swash plate control oil cylinder, so as to push the swash plate control oil cylinder to reduce the A port displacement of the closed hydraulic pump, and realize the A port pressure control of the feeding oil cylinder.
The working procedure of this embodiment is:
as shown in fig. 2-3, the controller is respectively and electrically connected with the first pilot proportional valve 5 and the second pilot proportional valve 6, the controller controls the first pilot proportional valve 5 to act, the first proportional pilot valve 5 outputs hydraulic oil with specified pressure according to the given current instructed by the controller, the hydraulic oil proportionally pushes the swash plate control cylinder 3 through the first shuttle valve 4 to control the swash plate swing angle of the closed hydraulic pump 2, thereby controlling the displacement of the closed hydraulic pump 2, realizing the control of the flow flowing into the port of the feeding cylinder 11A, and controlling the lifting and retracting speed of the feeding cylinder 11;
when the controller controls the second proportional pilot valve 6 to act, the second proportional pilot valve 6 outputs hydraulic oil with specified pressure according to the instruction of the controller, the hydraulic oil flows through the second shuttle valve 7 to proportionally push the swash plate control cylinder 3 to control the swash plate swing angle of the closed hydraulic pump 2, so that the displacement of the closed hydraulic pump is controlled, the flow control of the inlet of the feeding oil cylinder 11B is realized, and the feeding and extending speed of the feeding oil cylinder 11 is controlled.
The second overflow valve 19 and the auxiliary pump 20 form hydraulic oil sources of the first proportional pilot valve 5 and the second proportional pilot valve 6.
The controller is electrically connected with the first sequence valve 8 and the second sequence valve 9, the first sequence valve 8 sets the opening pressure according to the instruction of the controller, when the pressure of the opening of the feeding cylinder 11A is smaller than the set pressure, the first sequence valve 8 is closed, at the moment, the lifting and retracting pressure of the feeding cylinder 11 is influenced by the weight of a drilling tool, the weight of the feeding device and the like and indirectly applied to the feeding cylinder, the lifting and retracting speed is controlled by the first proportional pilot valve 5), when the load pressure of the opening of the feeding cylinder 11A is larger than the set pressure of the first sequence valve 8, the controller controls the first sequence valve 8 to be opened, the load pressure controls the swashplate to swing in the opposite direction through the second shuttle valve 7, and the lifting and retracting speed of the feeding cylinder 11 is reduced until the load pressure of the opening A is smaller than the set pressure value; the self-adaptive control of the lifting and retracting speed of the feeding oil cylinder 11 is realized;
according to the controller instruction, the second sequence valve 9 sets the opening pressure, when the pressure of the opening of the feeding cylinder 11B is smaller than the set pressure, the second sequence valve 9 is closed, at the moment, the feeding extension pressure of the feeding cylinder 11 is influenced by the load, the feeding extension speed is controlled by the second pilot proportional valve 6, when the load pressure of the opening of the feeding cylinder 11B is larger than the set pressure of the second sequence valve 9, the controller controls the second sequence valve 9 to be opened, the load pressure controls the swashplate to swing in the opposite direction through the first shuttle valve 4, the feeding extension speed of the feeding cylinder 11 is reduced until the load pressure of the opening of the feeding cylinder 11B is smaller than the set pressure value, and the self-adaptive control of the feeding extension speed of the feeding cylinder 11 is realized.
According to the embodiment, the pressure override control unit is used for realizing self-adaptive drilling speed of feeding or pulling speed, the variable of the swash plate of the closed hydraulic pump 2 is directly controlled, the output of the closed hydraulic pump 2 is the flow required by the feeding cylinder, manual control is not needed, and the method has good process adaptability, no throttling loss and high efficiency and energy conservation.
In this embodiment, five special remarks of the connecting line in each drawing represent the oil path, and the model of the controller is: STWESX-3CM.
As a preferred scheme of this embodiment, the closed electrohydraulic control system of the feeding cylinder of the drilling machine further comprises: the first check valve 15, the second check valve 16, the first balance valve 13 and the second balance valve 14, wherein the first check valve 16A is connected with the closed hydraulic pump 2A, the second check valve 16A is connected with the closed hydraulic pump 2B, and the first check valve 15B and the second check valve 16B are connected with the pressure oil tank 21; the first balance valve 13A and the second balance valve 14A are connected with the feed cylinder B, the first balance valve 13C and the second balance valve 14C are connected with the feed cylinder A, and the second balance valve 14B is connected with the pressure oil tank 21.
The first balance valve 13, the second balance valve 14, the first one-way valve 15, the second one-way valve 16 and the pressure oil tank 21 form an asymmetric flow control system of the feeding cylinder 11, namely an oil draining and supplementing loop, as shown in fig. 3, the closed hydraulic pump A is used for supplying oil, controlling the feeding cylinder to retract, the feeding cylinder A is used for controlling the pressure of the feeding cylinder A to control the first balance valve and the second balance valve C, controlling the first balance valve and the second balance valve to open, the oil returning part of the feeding cylinder B is used for feeding oil to the closed hydraulic pump B, and the residual oil source at the B flows back to the pressure oil tank through the second balance valve; and the closed hydraulic pump B port supplies oil, controls the feeding cylinder to extend out, the closed hydraulic pump A port absorbs oil, and the pressure oil tank supplements oil to the closed hydraulic pump A port through a second one-way valve to prevent empty suction. The starting back pressure of the first balance valve is set to be larger than the starting back pressure of the second balance valve, so that the surplus oil flows back to the pressure oil tank through the second balance valve under the condition that the requirement of the opening B of the closed hydraulic pump is completely ensured; the pressure of the opening A of the oil cylinder is smaller than the set value, and the first balance valve and the second balance valve are closed.
A first balance valve 13 and a second balance valve 14 are provided in the B of the feed cylinder 11, and pilot control ports of the first balance valve 13 and the second balance valve 14 are connected to the port of the feed cylinder 11A. When the closed hydraulic pump 2A is a high-pressure port and the feeding oil cylinder 11 is controlled to be pulled up and retracted, the pilot oil ports of the first balance valve 13 and the second balance valve 14 control the two first balance valves 13 and the second balance valve 14 to be opened, one part of hydraulic oil flows back to the pressure oil tank 21 through the first balance valve 13, and the other part of hydraulic oil flows back to the closed hydraulic pump 2B through the second balance valve 14;
when the first balance valve 13 is optimally arranged to be opened, the back pressure is slightly larger than that of the second balance valve 14, so that the oil requirement of the port 2B of the closed hydraulic pump can be preferentially ensured. Meanwhile, a first check valve 15 and a second check valve 16 are respectively arranged at A, B ports of the closed hydraulic pump 2, when the pressure of A, B ports of the feeding oil cylinder 11 is higher than that of the pressure oil tank 21, the first check valve 15 and the second check valve 16 are closed, when the pressure of A, B ports of the feeding oil cylinder 11 is lower than that of the pressure oil tank 21, oil can only flow into A, B ports of the closed hydraulic pump 2 from the pressure oil tank 21, oil is supplemented to 2B ports of the closed hydraulic pump through the first check valve 15, and oil is supplemented to 2A ports of the closed hydraulic pump 16, so that the problem of asymmetric oil cylinder pipeline flow is solved.
In practical application, the pilot control pressure of the first balance valve and the second balance valve is taken from the other end of the oil cylinder, and when the pipeline of the hole drilled to the karst cave or the 11B port of the feeding oil cylinder is suddenly out of pressure in the normal drilling feeding and extending process, the first balance valve and the second balance valve are closed, so that the weight of the self-weight drilling tool of the feeding device is balanced, the feeding dropping is prevented, and the safety of the system is improved.
Fig. 5 is a schematic diagram of a pressure oil tank 21 in this embodiment, in which the pressure oil tank is sealed, and compressed air is filled into the pressure oil tank, and the inflation pressure is generally greater than atmospheric pressure, so as to achieve the purposes of oil supplementing and air suction prevention.
As a preferred scheme of this embodiment, the closed electrohydraulic control system of the feeding cylinder of the drilling machine further comprises: the first safety valve 17 and the second safety valve 18, the second safety valve 18P is connected with the closed hydraulic pump 2A, the first safety valve 17P is connected with the closed hydraulic pump 2B, and the first safety valve 17T and the second safety valve 18T are both connected with the pressure oil tank 21.
As a preferred scheme of the embodiment, the closed electrohydraulic control system of the feeding cylinder of the drilling machine further comprises a flushing valve 10 and a first overflow valve 12, wherein a port of the flushing valve 10A is connected with a port of the feeding cylinder 11A, a port of the flushing valve 10B is connected with a port of the feeding cylinder 11B, a port of the flushing valve 10C is connected with a port of the first overflow valve 11P, and a port of the first overflow valve 11T is connected with a pressure oil tank 21.
The power machine 1 is connected with the closed hydraulic pump 2 and the auxiliary pump 20, the power machine 1 rotates to drive the closed hydraulic pump 2 and the auxiliary pump 20 to rotate to output high-pressure oil, a closed hydraulic pump 2 opening A, B is connected with a feeding cylinder 11 opening A, B to control the extension and retraction of the feeding cylinder 11, a first safety valve 17 and a second safety valve 18 are arranged at a A, B opening of the closed hydraulic pump 2, the highest working pressure of the closed hydraulic pump 2 is respectively set, so that the maximum feeding force extension and the maximum pulling retraction force are set, meanwhile, a flushing valve 10 is arranged between A, B openings of the feeding cylinder 11, when the cylinder extends or retracts, part of oil in a low-pressure cavity of the feeding cylinder 11 flows out of a closed loop through the flushing valve 10 to partially cool the oil, a first overflow valve 12 is arranged at an outlet of the flushing valve 10, and when the oil pressure of a low-pressure side oil in an opening A, B of the feeding cylinder 11 is lower than a set value of the first overflow valve 12, the oil cannot flow out, so that the stability of a system is improved.
As a preferable solution of this embodiment, the closed hydraulic pump 2 adopts a hydraulic proportional variable pump.
The hydraulic proportional variable pump can realize the stepless condition of feeding speed of the oil cylinder 11, no throttling and overflow losses are generated in the speed regulation process, the efficiency is high, and the regulation is convenient.
As a preferred embodiment of the present embodiment, the auxiliary pump 20 is a small displacement fixed displacement pump.
The small displacement pump is adopted as the oil supplementing pump, so that on one hand, the production cost can be saved, the equipment weight can be reduced, and on the other hand, the flow of the oil supplementing pump only needs to meet the control requirement, so that the overflow loss is small, the energy is saved, and the efficiency is high.
As a preferable aspect of the present embodiment, the first proportional pilot valve 5 and the second proportional pilot valve 6 use proportional pressure reducing relief valves.
The proportional pressure reducing overflow valve is adopted, so that the proportional control of the pilot pressure can be realized, the control precision is high, the accurate control of the pump displacement is realized, meanwhile, the proportional pressure reducing overflow valve belongs to a conventional element, and the proportional pressure reducing overflow valve can be conveniently purchased, and is beneficial to reducing the later stock period and the use cost.
Claims (7)
1. The utility model provides a rig is given feed cylinder closed electrohydraulic control system, includes power machine (1), closed hydraulic pump (2), first guide proportional valve (5), second guide proportional valve (6) and is given feed cylinder (11), power machine (1) and closed hydraulic pump (2) pass through the pipeline connection, closed hydraulic pump (2) A mouth is connected with feed cylinder (11) A mouth, and closed hydraulic pump (2) B mouth is connected with feed cylinder (11) B mouth, its characterized in that:
the drilling machine feeding oil cylinder closed electrohydraulic control system further comprises an auxiliary pump (20), a second overflow valve (19), a swash plate control oil cylinder (3), a first shuttle valve (4), a second shuttle valve (7), a first sequence valve (8) and a second sequence valve (9);
the A port of the swash plate control oil cylinder (3) is respectively connected with the A port of the closed hydraulic pump (2) and the outlet C of the first shuttle valve (4), and the B port of the swash plate control oil cylinder (3) is respectively connected with the A port of the closed hydraulic pump (2) and the outlet C of the second shuttle valve (7);
an inlet A of the first shuttle valve (4) is connected with an outlet B of the second sequence valve (9), an inlet B of the first shuttle valve (4) is connected with an outlet A of the first pilot proportional valve (5), and an inlet B of the second shuttle valve (7) is connected with an outlet B of the first sequence valve (8);
the P port of the first pilot proportional valve (5) and the P port of the second pilot proportional valve (6) are connected with the P port of the auxiliary pump (20) and the P port of the second overflow valve (19), and the T port of the auxiliary pump (20) is connected with the T port of the second overflow valve (19); the auxiliary pump (20) is connected with the closed hydraulic pump (2) through a pipeline, and the T port of the auxiliary pump (20) is connected with the T port of the second overflow valve (19) and is connected with the pressure oil tank (21);
the inlet A of the first sequence valve (8) is connected with the inlet A of the feeding oil cylinder (11), and the inlet A of the second sequence valve (9) is connected with the inlet B of the feeding oil cylinder (11); the oil enters a rod cavity through an A port of the feeding oil cylinder (11), and the oil enters a rodless cavity through a B port of the feeding oil cylinder (11);
the controller is electrically connected with the first sequence valve (8) and the second sequence valve (9), the first sequence valve (8) sets the opening pressure according to the controller instruction, when the load pressure at the A port of the feeding cylinder (11) is smaller than the set opening pressure, the first sequence valve (8) is closed, the lifting and retracting speed of the feeding cylinder (11) is controlled by the first pilot proportional valve (5), when the load pressure at the A port of the feeding cylinder (11) is larger than the opening pressure set by the first sequence valve (8), the controller controls the first sequence valve (8) to be opened, the load pressure oil at the A port of the feeding cylinder (11) swings in the opposite direction through the second shuttle valve (7), and the lifting and retracting speed of the feeding cylinder (11) is reduced until the load pressure at the A port of the feeding cylinder (11) is smaller than the set pressure value;
according to the controller instruction, the second sequence valve (9) sets an opening pressure, when the load pressure of the opening B of the feeding cylinder (11) is smaller than the set pressure of the second sequence valve (9), the second sequence valve (9) is closed, the feeding extending speed of the feeding cylinder (11) is controlled by the second pilot proportional valve (6), when the load pressure of the opening B of the feeding cylinder (11) is larger than the set opening pressure of the second sequence valve (9), the controller controls the opening of the second sequence valve (9), and the load pressure oil of the opening B of the feeding cylinder (11) swings in the opposite direction through the swash plate controlled by the first shuttle valve (4), and the feeding extending speed of the feeding cylinder (11) is reduced until the load pressure of the opening B of the feeding cylinder (11) is smaller than the set pressure value.
2. The drilling rig feed cylinder closed electro-hydraulic control system of claim 1,
the drilling machine feeding cylinder closed electrohydraulic control system further comprises:
the hydraulic control system comprises a first one-way valve (15), a second one-way valve (16), a first balance valve (13) and a second balance valve (14), wherein an outlet A of the second one-way valve (16) is connected with an A port of a closed hydraulic pump (2), an outlet A of the first one-way valve (15) is connected with a B port of the closed hydraulic pump (2), and an inlet B of the first one-way valve (15) and an inlet B of the second one-way valve (16) are both connected with a pressure oil tank (21);
the inlet A of the first balance valve (13) and the inlet A of the second balance valve (14) are connected with the port B of the feeding oil cylinder, the pilot oil port C of the first balance valve (13) and the pilot oil port C of the second balance valve (14) are connected with the port A of the feeding oil cylinder (11), and the outlet B of the second balance valve (14) is connected with the pressure oil tank (21); the outlet B of the first balance valve (13) is connected with the B port of the closed hydraulic pump (2), and the opening back pressure of the first balance valve (13) is larger than that of the second balance valve (14).
3. The drill feed cylinder closed electro-hydraulic control system of claim 2, further comprising:
the first safety valve (17) and the second safety valve (18), the P port of the second safety valve (18) is connected with the A port of the closed hydraulic pump (2), the P port of the first safety valve (17) is connected with the B port of the closed hydraulic pump (2), and the T port of the first safety valve (17) and the T port of the second safety valve (18) are both connected with the pressure oil tank (21).
4. The drill feed cylinder closed electro-hydraulic control system of claim 3, further comprising:
the flushing valve (10) is connected with the first overflow valve (12), the A port of the flushing valve (10) is connected with the A port of the feeding oil cylinder (11), the B port of the flushing valve (10) is connected with the B port of the feeding oil cylinder (11), the C port of the flushing valve (10) is connected with the P port of the first overflow valve (12), and the T port of the first overflow valve (12) is connected with the pressure oil tank (21).
5. The closed electrohydraulic control system of a drilling machine feed cylinder according to claim 1, characterized in that said closed hydraulic pump (2) is a hydraulic proportional variable pump.
6. The drilling machine feed cylinder closed electro-hydraulic control system according to claim 1, characterized in that the auxiliary pump (20) is a small displacement fixed displacement pump.
7. The closed electro-hydraulic control system of a drilling machine feed cylinder according to claim 1, characterized in that the first pilot proportional valve (5) and the second pilot proportional valve (6) are proportional relief valves.
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| CN202111496832.3A CN114483675B (en) | 2021-12-09 | 2021-12-09 | Closed electrohydraulic control system for feeding cylinder of drilling machine |
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| CN114483675B true CN114483675B (en) | 2023-10-31 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63259182A (en) * | 1987-04-16 | 1988-10-26 | Daikin Ind Ltd | Fluid control device |
| WO2012166589A1 (en) * | 2011-05-31 | 2012-12-06 | Caterpillar Inc. | Hydraulic fan circuit |
| CN202730562U (en) * | 2011-12-20 | 2013-02-13 | 株洲新通铁路装备有限公司 | A hydraulic system device for track layer traveling power matching |
| CN108953256A (en) * | 2018-08-01 | 2018-12-07 | 广西柳工机械股份有限公司 | loading machine hydrostatic drive system |
| CN112283190A (en) * | 2020-11-13 | 2021-01-29 | 中国铁建重工集团股份有限公司 | Hydraulic system, hydraulic slewing mechanism and walking device |
-
2021
- 2021-12-09 CN CN202111496832.3A patent/CN114483675B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63259182A (en) * | 1987-04-16 | 1988-10-26 | Daikin Ind Ltd | Fluid control device |
| WO2012166589A1 (en) * | 2011-05-31 | 2012-12-06 | Caterpillar Inc. | Hydraulic fan circuit |
| CN202730562U (en) * | 2011-12-20 | 2013-02-13 | 株洲新通铁路装备有限公司 | A hydraulic system device for track layer traveling power matching |
| CN108953256A (en) * | 2018-08-01 | 2018-12-07 | 广西柳工机械股份有限公司 | loading machine hydrostatic drive system |
| CN112283190A (en) * | 2020-11-13 | 2021-01-29 | 中国铁建重工集团股份有限公司 | Hydraulic system, hydraulic slewing mechanism and walking device |
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| CN114483675A (en) | 2022-05-13 |
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