CN115126751A - Hydraulic system with oil cylinder capable of quickly acting and adjustable buffering and hydraulic control method - Google Patents
Hydraulic system with oil cylinder capable of quickly acting and adjustable buffering and hydraulic control method Download PDFInfo
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- CN115126751A CN115126751A CN202210777598.XA CN202210777598A CN115126751A CN 115126751 A CN115126751 A CN 115126751A CN 202210777598 A CN202210777598 A CN 202210777598A CN 115126751 A CN115126751 A CN 115126751A
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/021—Installations or systems with accumulators used for damping
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/0275—Installations or systems with accumulators having accumulator charging devices with two or more pilot valves, e.g. for independent setting of the cut-in and cut-out pressures
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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
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention relates to a hydraulic system with quick action and adjustable buffering of an oil cylinder for workpiece forging and pressing in the field of forging and pressing equipment and a hydraulic control method, wherein the hydraulic system comprises a hydraulic station and an energy accumulator, and the energy accumulator is connected with the hydraulic station through a hydraulic supply pipeline to realize hydraulic energy storage; the energy accumulator is connected to the bidirectional action of the double-acting oil cylinder buffer driving oil cylinder through the logic valve and the bidirectional buffer liquid supply pipeline, the oil outlet of the logic valve is connected with the electromagnetic ball valve for controlling the on-off of the logic valve, and displacement sensors are respectively arranged in the rod cavity and the rodless cavity of the double-acting oil cylinder for detecting the buffer initial position of the piston of the double-acting oil cylinder. The hydraulic system realizes the buffering of the action of the oil cylinder by arranging the buffering system in the oil supply pipeline, and the buffering speed is adjustable.
Description
Technical Field
The invention relates to the field of forging equipment, in particular to a hydraulic system with an adjustable buffer and an oil cylinder for workpiece forging, which can act quickly, and a hydraulic control method.
Background
Automated forging lines require rapid movement of the various components to reduce thermal degradation of the forging. The action of ejecting the oil cylinder under the forging press is slow and does not meet the technological requirements, the oil cylinder can be impacted quickly, the service life of the oil cylinder is shortened, the forge piece is ejected out of the die cavity easily, and at the moment, the manipulator cannot grab the forge piece and cannot realize automatic production. In the prior art, during casting, a hydraulic oil supply system adopts a high-power motor and a large-displacement pump to directly drive an oil cylinder to realize quick action, and a buffer device is arranged in the oil cylinder to realize tail end buffering. And when the casting and pressing equipment works, the motor and the pump are required to work all the time, the power consumption is high, the service lives of the motor and the pump are short, and the buffer structure arranged in the oil cylinder is not adjustable, so that the buffer effect is not obvious frequently or the tail end of the oil cylinder is too slow to influence the beat of the whole line action. Therefore, a new technology is needed to realize the quick action of the oil cylinder and the buffer at the end of the stroke is adjustable.
Disclosure of Invention
The invention aims at solving the problem that the action speed of an oil cylinder and a buffer structure arranged in the oil cylinder are not adjustable when a hydraulic system of forging equipment supplies oil to the oil cylinder in the prior art, and firstly provides a hydraulic system with an adjustable buffer and a quick action of the oil cylinder.
The hydraulic system comprises a hydraulic station and an energy accumulator, wherein the energy accumulator is connected with the hydraulic station through a hydraulic supply pipeline to realize hydraulic energy storage; the energy accumulator is connected to the bidirectional action of the double-acting oil cylinder buffer driving oil cylinder through the logic valve and the bidirectional buffer liquid supply pipeline, the oil outlet of the logic valve is connected with the electromagnetic ball valve for controlling the on-off of the logic valve, and displacement sensors are respectively arranged in the rod cavity and the rodless cavity of the double-acting oil cylinder for detecting the buffer initial position of the piston of the double-acting oil cylinder.
Furthermore, in order to ensure that the hydraulic station supplies liquid and stores energy to the energy accumulator, the hydraulic supply pipeline comprises a filter, a plunger pump, a one-way valve, a first ball valve, a double-point pressure switch, a pressure gauge and a second ball valve which are connected through a hydraulic pipeline, and the plunger pump is driven by a motor; the other end of the second ball valve is connected to an inlet and an outlet of an energy accumulator through a hydraulic pipeline, and a first pilot overflow valve is connected to the hydraulic pipeline between the energy accumulator and the second ball valve in a branching manner and used for adjusting the highest energy storage pressure of the energy accumulator; and a low-pressure signal value and a high-pressure signal value are preset in the double-point pressure switch and are used for controlling the on-off of the energy storage pipeline.
In order to facilitate the maintenance and overhaul of the energy accumulator, the energy accumulator and the first pilot type overflow valve are also connected in parallel with a third ball valve for pressure relief and liquid drainage during the maintenance of the energy accumulator.
In order to facilitate the pressure stabilization in the energy storage and liquid supply period, an electromagnetic overflow valve and a pressure gauge are further connected to a hydraulic pipeline between the plunger pump and the one-way valve, the electromagnetic overflow valve is used for adjusting the pressure of the hydraulic supply pipeline, and during the non-energy storage and liquid supply period, the electromagnetic overflow valve is normally open when power is lost so that an overflow branch flows back to the hydraulic station; the first ball valve and the second ball valve are in normally open states except for the maintenance and overhaul period of the energy accumulator.
In order to facilitate the realization of the buffering action of the oil cylinder, the bidirectional buffering liquid supply pipeline comprises a large-drift-diameter three-position four-way electromagnetic valve and a small-drift-diameter three-position four-way electromagnetic valve which are connected in parallel, and oil inlet and outlet ports are simultaneously connected with a rod cavity and a rodless cavity of the double-acting oil cylinder through a hydraulic pipeline, so that the large-drift-diameter three-position four-way electromagnetic valve and the small-drift-diameter two-position three-way electromagnetic valve are simultaneously communicated with the double-acting oil cylinder, and a large-drift-diameter bidirectional throttle valve and a small-drift-diameter bidirectional throttle valve are respectively connected between the large-drift-diameter three-position four-way electromagnetic valve and the small-drift-diameter three-position four-way electromagnetic valve and the oil cylinder and used for adjusting the flow of the oil supplied to the oil cylinder so as to control the action speed of the oil cylinder. According to the buffer liquid supply pipeline, two paths of oil supply pipelines with different flow rates simultaneously supply oil to the oil cylinder to realize rapid displacement of the oil cylinder in the early stage of action, when the oil cylinder is rapidly displaced to a preset displacement sensor in the oil cylinder, an oil supply branch of the large-drift-diameter three-position four-way electromagnetic valve is closed, the oil supply of the small-drift-diameter three-position four-way electromagnetic valve is realized, the tail end is buffered to the tail end position of the stroke of the oil cylinder, and the flow rates of the supplied oil can be further adjusted through throttle valves on respective branches to adjust the operation speed of the oil cylinder.
In order to facilitate pressure monitoring, a rod cavity pressure gauge and a rod cavity pressure switch are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder, a rod cavity-free pressure gauge and a rod cavity-free pressure switch are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder and are respectively used for monitoring the pressure of a rod cavity hydraulic pipeline and the pressure of a rod cavity-free hydraulic pipeline, and a high-pressure signal and a low-pressure alarm signal are preset in the rod cavity pressure switch and the rod cavity-free pressure switch; and a second pilot overflow valve is also connected to a rodless cavity connecting pipeline of the double-acting oil cylinder and used for stabilizing the pressure in the rodless cavity of the double-acting oil cylinder.
In order to further realize the process of quick action and adjustable buffer of the oil cylinder, the invention also provides a hydraulic control method adopting the hydraulic system with quick action and adjustable buffer of the oil cylinder, and the following control process is carried out through a PLC (programmable logic controller):
an energy storage process: when the energy accumulator stops supplying oil to the double-acting oil cylinder, when the double-point pressure switch detects that the pressure of a pipeline connected with the energy accumulator reaches a preset low-pressure signal value, the electromagnetic overflow valve is electrified, the normal-pressure oil return branch is closed, the overflow function is started, after the pressure of a hydraulic supply pipeline reaches the opening pressure of the one-way valve, the energy is supplied to the energy accumulator for storing energy, until the double-point pressure switch detects that the pressure of the connecting pipeline reaches a preset high-pressure signal value, the electromagnetic overflow valve is electrified, the oil return branch returns to the normal-pressure oil return to the hydraulic station, the pressure of the liquid inlet end of the one-way valve is reduced and closed, and the primary energy storage process is completed;
the stroke buffering oil supply process comprises the following steps: the PLC receives a signal of stroke action of the oil cylinder, the electromagnetic ball valve is powered on, the logic valve is switched on, one side of the large-bore three-position four-way electromagnetic valve and the small-bore three-position four-way electromagnetic valve, which are communicated with the rodless cavity, is powered on, oil is supplied to the rodless cavity of the double-acting oil cylinder at the same time, oil is returned to the hydraulic station from the other side of the double-acting oil cylinder, the piston of the double-acting oil cylinder is pushed by hydraulic pressure to move to a buffering initial position indicated by a displacement transmitter in the rodless cavity, the large-bore three-position four-way electromagnetic valve is powered off firstly, the double-acting oil cylinder continues to supply oil through the small-bore three-position four-way electromagnetic valve to realize end buffering until the piston moves to a limit position, the oil pressure in the oil cylinder rises to a preset high pressure value, the rodless cavity pressure switch detects the high pressure value in the oil cylinder and sends a high pressure signal, the small-bore three-position four-way electromagnetic valve is powered off, the oil cylinder stops supplying oil, and the buffering oil supply process of a single stroke is completed;
a return buffering oil supply process: the PLC receives a signal of a return stroke action of the oil cylinder, one side of the large-bore three-position four-way electromagnetic valve and one side of the small-bore three-position four-way electromagnetic valve, which are communicated with the rod cavity, are electrified, oil is supplied to the rod cavity of the double-acting oil cylinder, the other side of the large-bore three-position four-way electromagnetic valve returns to a hydraulic station, a piston of the double-acting oil cylinder is hydraulically pushed to move to a buffering initial position indicated by a displacement transmitter in the rod cavity, the large-bore three-position four-way electromagnetic valve is firstly powered off, the double-acting oil cylinder continues to supply oil through the small-bore three-position four-way electromagnetic valve to realize tail end buffering until the piston moves to a limit position, oil pressure in the oil cylinder rises to a preset high pressure value, the rod cavity pressure switch detects a high pressure value in the oil cylinder, a high pressure signal is sent, the small-bore three-position four-way electromagnetic valve is powered off, the oil cylinder stops supplying, and a buffering oil supplying process of a single return stroke is completed.
According to the hydraulic control method for the oil cylinder to rapidly act and adjust the buffer, the stroke action and the return action of the oil cylinder realize high-pressure oil supply through the energy accumulator, the oil inlet of the oil cylinder simultaneously enters the oil through the large-diameter three-position four-way solenoid valve pipeline and the small-diameter three-position four-way solenoid valve pipeline to realize rapid oil inlet so as to push the oil cylinder to rapidly act, the large-flow oil inlet pipeline is closed when the oil cylinder moves to the tail end, the oil is supplied to the oil cylinder in place through the small-diameter three-position four-way solenoid valve, the tail end buffer of the oil cylinder is realized, namely, the tail end buffer is realized through the oil supply system, compared with the arrangement of a mechanical buffer structure in the oil cylinder, the buffer speed can be flexibly adjusted through the oil supply amount, and the problem that the maintenance of the buffer structure in the oil cylinder is inconvenient is avoided, therefore, the hydraulic control method disclosed by the invention realizes rapid oil supply to the oil cylinder, rapidly pushes the oil cylinder to act and has adjustable speed, and the buffer oil supply at the tail end of the oil cylinder is realized, the oil cylinder is protected, and the casting operation is realized.
In order to prevent the impact on forging and pressing actions caused by the sudden increase of the oil pressure of the energy accumulator in the initial oil supply stage of the rodless cavity in the stroke process of the oil cylinder, the second pilot overflow valve opens to overflow to adjust the pressure in the rodless cavity oil cylinder when the pressure in the rodless cavity exceeds the overflow pressure of the second pilot overflow valve in the stroke buffering oil supply process.
In order to adjust the action speed of the oil cylinder conveniently, the running speed of the oil cylinder is adjusted by the large-drift-diameter bidirectional throttle valve and the small-drift-diameter bidirectional throttle valve in the stroke buffering oil supply process and the return buffering oil supply process.
In order to facilitate timely monitoring of oil pressure abnormity, when the pressure of an oil supply pipeline is lower than the low-pressure alarm pressure value of a pressure switch with a rod cavity or a pressure switch without a rod cavity in a stroke buffer oil supply process or a return buffer oil supply process, the corresponding pressure switch sends out an alarm signal to stop the engine for maintenance.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system with an adjustable damping and a fast acting oil cylinder according to the present invention.
Wherein, 1 hydraulic station; 2, a filter; 3, hydraulic switch; 3 a plunger pump; 5, a motor; 6, a pressure gauge; 7, a one-way valve; 8 a first ball valve; 9 an electromagnetic overflow valve; 10 a first pilot operated relief valve; 11 an energy storage device; 12 a third ball valve; 13 a second ball valve; 14 pressure gauge; 15 double-point pressure switch; 16 an electromagnetic ball valve; 17 a logic valve; 18 large-diameter three-position four-way electromagnetic valve; 19 large-drift-diameter bidirectional throttle valve; 20 small-bore three-position four-way solenoid valves; 21 small-drift-diameter bidirectional throttle valve; 22 a second pilot overflow valve; 23 a rod cavity pressure gauge; 24 a rod cavity pressure switch; 25 double-acting oil cylinder; 26 a rodless chamber pressure switch; 27 rodless chamber pressure gauge.
Detailed Description
Example 1
As shown in fig. 1, the hydraulic system with fast cylinder action and adjustable buffer of the invention comprises a hydraulic station 1 and an energy accumulator 11, wherein the energy accumulator 11 is connected with the hydraulic station 1 through a hydraulic supply pipeline to realize hydraulic energy storage; a hydraulic switch 3 for controlling and detecting the oil level is arranged in the hydraulic station 1, so that the oil level in the hydraulic station 1 is between the set high and low oil levels; the energy accumulator 11 is connected to the double-acting oil cylinder 25 through the logic valve 17 and the two-way buffering liquid supply pipeline to buffer the two-way action of the driving oil cylinder, the oil outlet of the logic valve 17 is connected with the electromagnetic ball valve 16 for controlling the switch of the logic valve 17, the electromagnetic ball valve 16 closes the logic valve 17 when the oil cylinder does not act, and displacement sensors are respectively arranged in a rod cavity and a rodless cavity of the double-acting oil cylinder 25 and used for detecting the buffering initial position of a piston of the double-acting oil cylinder, so that the two-way buffering liquid supply pipeline can buffer and supply oil to the tail end of the double-acting oil cylinder 25.
In order to ensure that the hydraulic station 1 smoothly supplies liquid and stores energy to the energy accumulator 11, the hydraulic supply pipeline comprises a filter 2, a plunger pump 4, a check valve 7, a first ball valve 8, a two-point pressure switch 15, a pressure gauge 14 and a second ball valve 13 which are sequentially connected through a hydraulic pipeline, the other end of the second ball valve 13 is connected to an inlet and an outlet of the energy accumulator 11 through the hydraulic pipeline, and a first pilot type overflow valve 10 is further connected to the hydraulic pipeline between the energy accumulator 1 and the second ball valve 13 in a branching manner and used for adjusting the highest energy storage pressure of the energy accumulator 11; the two-point pressure switch 15 is preset with a low-pressure signal value and a high-pressure signal value for controlling the on-off of the energy storage pipeline.
In order to facilitate the maintenance and repair of the energy accumulator 11, the energy accumulator 1 and the first pilot overflow valve 10 are also connected in parallel with a third ball valve 13 for pressure relief, liquid drainage and oil return during the maintenance of the energy accumulator 11.
In order to facilitate pressure stabilization and monitoring during energy storage and liquid supply, an electromagnetic overflow valve 9 and pressure 6 are further connected to a hydraulic pipeline between the plunger pump 4 and the one-way valve 7, the electromagnetic overflow valve 9 is used for adjusting the pressure of the hydraulic supply pipeline, and during non-energy storage and liquid supply, the electromagnetic overflow valve 9 is powered off and normally opened to enable an overflow branch to return to the hydraulic station 1 at normal pressure; the first ball valve 8 and the second ball valve 13 are normally open during operation other than the maintenance and repair of the accumulator 11. During non-energy storage, although the plunger pump pumps oil from the hydraulic station to the pipeline ceaselessly, the electromagnetic overflow valve 9 is in a normally open state under the power-off state, hydraulic oil in the oil pipe directly flows back to the hydraulic station 1, and the inlet end of the check valve 7 is in a low-pressure closed state and is closed to be communicated with the energy accumulator 11.
In order to facilitate the realization of the buffering action of the oil cylinder, the bidirectional buffering liquid supply pipeline comprises a large-drift-diameter three-position four-way electromagnetic valve 18 and a small-drift-diameter three-position four-way electromagnetic valve 20 which are connected in parallel, oil inlet and outlet ports are simultaneously connected with a rod cavity and a rodless cavity of the double-acting oil cylinder 25 through hydraulic pipelines, the large-drift-diameter three-position four-way electromagnetic valve 18 and the small-drift-diameter two-position three-way electromagnetic valve 20 are simultaneously communicated with the double-acting oil cylinder 25, and a large-drift-diameter bidirectional throttle valve 19 and a small-drift-diameter bidirectional throttle valve 21 are respectively connected between the large-drift-diameter three-way electromagnetic valve 18 and the small-drift-diameter three-position four-way electromagnetic valve 20 and the double-acting oil cylinder 25 and used for adjusting the flow of oil supply into the double-acting oil cylinder 25 so as to control the action speed of the oil cylinder. The buffering liquid supply pipeline of this embodiment supplies oil to the hydro-cylinder simultaneously with the high-pressure oil of accumulator through two way oil supply pipe ways that big small flow is different and realizes the quick displacement of hydro-cylinder action early stage, when quick displacement to the predetermined displacement sensor in the hydro-cylinder, closes the oil supply branch of big latus rectum tribit four-way solenoid valve 18, realizes the terminal end through the terminal position of little latus rectum tribit four-way solenoid valve 20 oil supply buffering to the hydro-cylinder stroke to can also further adjust the feed liquid flow through the choke valve on branch separately in order to adjust the functioning speed of hydro-cylinder.
For convenience of pressure monitoring, a rod cavity pressure gauge 23 and a rod cavity pressure switch 24 are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder 25, a rod cavity-free pressure gauge 27 and a rod cavity-free pressure switch 26 are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder 25 and are respectively used for monitoring the pressure of a rod cavity hydraulic pipeline and the pressure of a rod cavity-free hydraulic pipeline, and a high-pressure signal and a low-pressure alarm signal are preset in the rod cavity pressure switch 24 and the rod cavity-free pressure switch 26; and a second pilot overflow valve 22 is also connected to a rodless cavity connecting pipeline of the double-acting oil cylinder 25 and is used for stabilizing the pressure in the rodless cavity of the double-acting oil cylinder 25.
The hydraulic system with the fast acting and adjustable buffering functions for the oil cylinder is characterized in that an energy accumulator is used for hydraulic energy storage in advance, high-pressure fast oil supply is conveniently achieved for a double-acting oil cylinder, the oil cylinder is driven fast to act, meanwhile, two oil supply pipelines with different flow rates are arranged at an oil inlet of the oil cylinder, large-flow fast oil inlet at the initial stage of the oil cylinder action can be achieved, when the oil cylinder acts to be close to the tail end of a stroke, large-flow oil supply is closed, tail end buffering of the oil cylinder action is achieved only through small-flow oil supply, the oil cylinder and casting equipment are protected, in the oil supply process, the oil inlet flow rate can be adjusted through respective throttling valves, fast and adjustable oil cylinder action is achieved, and the buffering function is achieved, and therefore the oil cylinder and the casting equipment are protected.
Example 2
The embodiment provides a hydraulic control method for a hydraulic system which adopts the oil cylinder to rapidly act and has adjustable buffering, and the following control processes are carried out through a PLC (programmable logic controller):
energy storage process: when the energy accumulator 11 stops supplying 25 oil to the double-acting oil cylinder, when the double-point pressure switch 15 detects that the pressure of a pipeline connected with the energy accumulator 11 reaches a preset low-pressure signal value, the electromagnetic overflow valve 9 is powered on, the normal-pressure oil return branch is closed, the overflow function is started, the hydraulic supply pipeline pressure is started after reaching the starting pressure of the check valve 7, the energy storage pipeline is communicated, the liquid is supplied for energy storage to the energy accumulator 11 until the double-point pressure switch 15 detects that the pressure of the connecting pipeline reaches a preset high-pressure signal value, the electromagnetic overflow valve 9 is powered off, the oil return branch returns to the hydraulic station 1 at normal pressure, the pressure of the liquid inlet end of the check valve 7 is reduced and closed, and the primary energy storage process is completed;
the stroke buffering oil supply process comprises the following steps: the PLC receives the stroke action signal of the oil cylinder, the electromagnetic ball valve 16 is electrified, the logic valve 17 is connected, the large-bore three-position four-way electromagnetic valve 18 and the small-bore three-position four-way electromagnetic valve 20 are electrified at the side communicated with the rodless cavity, simultaneously, oil is supplied to a rodless cavity of the double-acting oil cylinder 25, oil returns to the hydraulic station 1 from the other side, the piston of the double-acting oil cylinder 25 is pushed by hydraulic pressure to move to a buffering initial position indicated by a displacement transmitter in the rodless cavity, the large-drift-diameter three-position four-way electromagnetic valve 18 loses electricity first, the double-acting oil cylinder 25 continues supplying oil through the small-drift-diameter three-position four-way electromagnetic valve 20 to realize tail-end buffering oil supply until the piston moves to a limit position, the oil pressure in the oil cylinder rises to a preset high-pressure value, the rodless-cavity pressure switch 26 detects the high-pressure value in the oil cylinder and sends a high-pressure signal, the small-drift-diameter three-position four-way electromagnetic valve 20 loses electricity, the double-acting oil cylinder 25 stops supplying oil, and the buffering oil supply process of a single stroke is finished; in order to prevent the impact on forging and pressing actions caused by the sudden increase of the oil pressure in the initial oil supply period of the energy accumulator 11 to the rodless cavity in the stroke process of the oil cylinder, the second pilot overflow valve 22 is opened to overflow and regulate the pressure in the rodless cavity oil cylinder when the pressure in the rodless cavity exceeds the overflow pressure of the second pilot overflow valve 22 in the stroke buffering oil supply process.
The return buffering oil supply process: the PLC receives a signal of a return stroke action of the oil cylinder, one side of the large-bore three-position four-way electromagnetic valve 18 and the small-bore three-position four-way electromagnetic valve 20, which is communicated with the rod cavity, is electrified, oil is supplied to the rod cavity of the double-acting oil cylinder 25, oil returns to the hydraulic station 1 from the other side of the double-acting oil cylinder, a piston of the double-acting oil cylinder 25 is pushed by hydraulic pressure to move to a buffering initial position indicated by a displacement transmitter in the rod cavity, the large-bore three-position four-way electromagnetic valve 18 loses electricity first, the double-acting oil cylinder 25 continues to supply oil through the small-bore three-position four-way electromagnetic valve 20 to realize tail end buffering until the piston moves to a limit position, the oil pressure in the oil cylinder rises to a preset high pressure value, the rod cavity pressure switch 24 detects the high pressure value in the oil cylinder and sends a high pressure signal, the small-bore three-position four-way electromagnetic valve 20 loses electricity, the oil cylinder stops supplying, and the buffering oil supplying process of a single return stroke is finished.
In the stroke buffer oil supply process and the return stroke buffer oil supply process, in order to adjust the action speed of the oil cylinder, the running speed of the oil cylinder is adjusted by the large-drift-diameter bidirectional throttle valve 19 and the small-drift-diameter bidirectional throttle valve 21; in order to facilitate timely monitoring of oil pressure abnormity, when the pressure of an oil supply pipeline is lower than a low-pressure alarm pressure value of a pressure switch with a rod cavity or a pressure switch without the rod cavity in a stroke buffer oil supply process or a return buffer oil supply process, the corresponding pressure switch sends an alarm signal to perform shutdown maintenance.
In the hydraulic control method with the fast acting and adjustable buffer for the oil cylinder, the stroke action and the return action of the oil cylinder realize high-pressure oil supply through the energy accumulator, the oil inlet of the oil cylinder simultaneously enters the oil through the large-drift-diameter three-position four-way solenoid valve pipeline and the small-drift-diameter three-position four-way solenoid valve pipeline to realize fast oil inlet so as to push the oil cylinder to fast act, the large-flow oil inlet pipeline is closed when the oil cylinder moves to the tail end, the oil is supplied to the oil cylinder in place through the small-drift-diameter three-position four-way solenoid valve to realize tail end buffer of the oil cylinder, namely tail end buffer is realized through the oil supply system, compared with the arrangement of a mechanical buffer structure in the oil cylinder, the buffer speed can be flexibly adjusted through the oil supply amount, and the problem that the maintenance of the buffer structure in the oil cylinder is inconvenient is avoided, therefore, the hydraulic control method realizes fast oil supply to the oil cylinder, fast pushes the oil cylinder to act and has adjustable speed, and the buffer oil supply at the tail end of the oil cylinder is realized, the oil cylinder is protected, and the casting operation is realized.
Claims (10)
1. A hydraulic system with an oil cylinder capable of quickly acting and adjustable in buffering comprises a hydraulic station and an energy accumulator, wherein the energy accumulator is connected with the hydraulic station through a hydraulic supply pipeline to realize hydraulic energy storage; the energy accumulator is connected to the bidirectional action of the double-acting oil cylinder buffer driving oil cylinder through the logic valve and the bidirectional buffer liquid supply pipeline, the oil outlet of the logic valve is connected with the electromagnetic ball valve for controlling the on-off of the logic valve, and displacement sensors are respectively arranged in the rod cavity and the rodless cavity of the double-acting oil cylinder for detecting the buffer initial position of the piston of the double-acting oil cylinder.
2. The hydraulic system with the fast-acting and adjustable-buffering oil cylinder as claimed in claim 1, wherein the hydraulic supply pipeline comprises a filter, a plunger pump, a one-way valve, a first ball valve, a two-point pressure switch, a pressure gauge and a second ball valve which are connected through a hydraulic pipeline, and the plunger pump is driven by a motor; the other end of the second ball valve is connected to an inlet and an outlet of an energy accumulator through a hydraulic pipeline, and a first pilot overflow valve is connected to the hydraulic pipeline between the energy accumulator and the second ball valve in a branching manner and used for adjusting the highest energy storage pressure of the energy accumulator; and a low-pressure signal value and a high-pressure signal value are preset in the double-point pressure switch and are used for controlling the on-off of the energy storage pipeline.
3. The hydraulic system with the oil cylinder capable of realizing quick action and adjustable buffering as claimed in claim 2, wherein the energy accumulator and the first pilot overflow valve are further connected in parallel with a third ball valve for pressure relief and liquid drainage during maintenance of the energy accumulator.
4. The hydraulic system with the oil cylinder capable of achieving quick action and adjustable buffering as claimed in claim 2, wherein an electromagnetic overflow valve and a pressure gauge are further connected to a hydraulic pipeline between the plunger pump and the one-way valve, the electromagnetic overflow valve is used for adjusting the pressure of a hydraulic supply pipeline, and during non-energy-storage liquid supply, the electromagnetic overflow valve is powered off and normally opened to enable an overflow branch to flow back to the hydraulic station; and the first ball valve and the second ball valve are in normally open states except for the maintenance and overhaul periods of the energy accumulator during working.
5. The hydraulic system with the fast-acting and adjustable-buffering oil cylinder as claimed in claim 1, wherein the bidirectional buffering liquid supply pipeline comprises a large-drift-diameter three-position four-way solenoid valve and a small-drift-diameter three-position four-way solenoid valve which are connected in parallel, and oil inlet and outlet ports are connected with a rod cavity and a rodless cavity of the double-acting oil cylinder through hydraulic pipelines at the same time, so that the large-drift-diameter three-position four-way solenoid valve and the small-drift-diameter two-position three-way solenoid valve are communicated with the double-acting oil cylinder at the same time, and a large-drift-diameter bidirectional throttle valve and a small-drift-diameter bidirectional throttle valve are connected between the large-drift-diameter three-way solenoid valve and the small-drift-diameter three-position four-way solenoid valve and the oil cylinder respectively and used for adjusting the flow of oil supplied to the oil cylinder to control the speed of the action of the oil cylinder.
6. The hydraulic system with the fast-acting and adjustable-buffering oil cylinder as claimed in claim 4, wherein a rod cavity pressure gauge and a rod cavity pressure switch are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder, a rod cavity-free pressure gauge and a rod cavity-free pressure switch are respectively connected to a rod cavity connecting pipeline of the double-acting oil cylinder and are respectively used for monitoring the pressure of the rod cavity hydraulic pipeline and the pressure of the rod cavity-free hydraulic pipeline, and a high-pressure signal and a low-pressure alarm signal are preset in the rod cavity pressure switch and the rod cavity-free pressure switch; and a second pilot overflow valve is also connected to a rodless cavity connecting pipeline of the double-acting oil cylinder and is used for stabilizing the pressure in the rodless cavity of the double-acting oil cylinder.
7. A hydraulic control method using the hydraulic system according to any one of claims 1 to 6, characterized in that the following control process is performed by a PLC controller:
an energy storage process: when the energy accumulator stops supplying oil to the double-acting oil cylinder, when the double-point pressure switch detects that the pressure of a pipeline connected with the energy accumulator reaches a preset low-pressure signal value, the electromagnetic overflow valve is electrified, the normal-pressure oil return branch is closed, the overflow function is started, after the pressure of a hydraulic supply pipeline reaches the opening pressure of the one-way valve, the energy is supplied to the energy accumulator for storing energy, until the double-point pressure switch detects that the pressure of the connecting pipeline reaches a preset high-pressure signal value, the electromagnetic overflow valve is electrified, the oil return branch returns to the normal-pressure oil return to the hydraulic station, the pressure of the liquid inlet end of the one-way valve is reduced and closed, and the primary energy storage process is completed;
the stroke buffering oil supply process comprises the following steps: the PLC receives a signal of stroke action of the oil cylinder, the electromagnetic ball valve is powered on, the logic valve is switched on, one side of the large-bore three-position four-way electromagnetic valve and the small-bore three-position four-way electromagnetic valve, which are communicated with the rodless cavity, is powered on, oil is supplied to the rodless cavity of the double-acting oil cylinder at the same time, oil is returned to the hydraulic station from the other side of the double-acting oil cylinder, the piston of the double-acting oil cylinder is pushed by hydraulic pressure to move to a buffering initial position indicated by a displacement transmitter in the rodless cavity, the large-bore three-position four-way electromagnetic valve is powered off firstly, the double-acting oil cylinder continues to supply oil through the small-bore three-position four-way electromagnetic valve to realize end buffering until the piston moves to a limit position, the oil pressure in the oil cylinder rises to a preset high pressure value, the rodless cavity pressure switch detects the high pressure value in the oil cylinder and sends a high pressure signal, the small-bore three-position four-way electromagnetic valve is powered off, the oil cylinder stops supplying oil, and the buffering oil supply process of a single stroke is completed;
the return buffering oil supply process: the PLC receives a signal of a return stroke action of the oil cylinder, one side of the large-bore three-position four-way electromagnetic valve and one side of the small-bore three-position four-way electromagnetic valve, which are communicated with the rod cavity, are electrified, oil is supplied to the rod cavity of the double-acting oil cylinder, the other side of the large-bore three-position four-way electromagnetic valve returns to a hydraulic station, a piston of the double-acting oil cylinder is hydraulically pushed to move to a buffering initial position indicated by a displacement transmitter in the rod cavity, the large-bore three-position four-way electromagnetic valve is firstly powered off, the double-acting oil cylinder continues to supply oil through the small-bore three-position four-way electromagnetic valve to realize tail end buffering until the piston moves to a limit position, oil pressure in the oil cylinder rises to a preset high pressure value, the rod cavity pressure switch detects a high pressure value in the oil cylinder, a high pressure signal is sent, the small-bore three-position four-way electromagnetic valve is powered off, the oil cylinder stops supplying, and a buffering oil supplying process of a single return stroke is completed.
8. The hydraulic control method according to claim 7, wherein the second pilot spill valve opens to spill the pressure in the cylinder of the rodless chamber when the pressure in the rodless chamber exceeds the spill pressure of the second pilot spill valve during the stroke buffer fuel supply.
9. The hydraulic control method according to claim 7, wherein the cylinder operation speed is adjusted by the large-bore bidirectional throttle valve and the small-bore bidirectional throttle valve in both the stroke buffer oil supply process and the return buffer oil supply process.
10. The hydraulic control method according to claim 7, wherein when the pressure of the oil supply line pipe is lower than a low-pressure alarm pressure value of the rod chamber pressure switch or the rod-less chamber pressure switch during the stroke buffer oil supply process or the return buffer oil supply process, the corresponding pressure switch sends an alarm signal to perform shutdown maintenance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210777598.XA CN115126751A (en) | 2022-07-04 | 2022-07-04 | Hydraulic system with oil cylinder capable of quickly acting and adjustable buffering and hydraulic control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210777598.XA CN115126751A (en) | 2022-07-04 | 2022-07-04 | Hydraulic system with oil cylinder capable of quickly acting and adjustable buffering and hydraulic control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115126751A true CN115126751A (en) | 2022-09-30 |
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ID=83380953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210777598.XA Pending CN115126751A (en) | 2022-07-04 | 2022-07-04 | Hydraulic system with oil cylinder capable of quickly acting and adjustable buffering and hydraulic control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115126751A (en) |
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2022
- 2022-07-04 CN CN202210777598.XA patent/CN115126751A/en active Pending
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