CN111365326B - Hydraulic oil ultrasonic defoaming control system and control method - Google Patents
Hydraulic oil ultrasonic defoaming control system and control method Download PDFInfo
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- CN111365326B CN111365326B CN202010183347.XA CN202010183347A CN111365326B CN 111365326 B CN111365326 B CN 111365326B CN 202010183347 A CN202010183347 A CN 202010183347A CN 111365326 B CN111365326 B CN 111365326B
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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
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
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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
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/12—Fluid oscillators or pulse generators
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Abstract
The invention discloses a hydraulic oil ultrasonic defoaming control system and a control method, wherein the control system comprises an oil tank, a peripheral oil way, a vacuum pump and a PLC (programmable logic controller); the oil tank comprises a tank body, an upper cover, a lower cover and an ultrasonic transducer; the upper cover is arranged at the upper end of the tank body; the lower cover is arranged at the lower end of the tank body; the ultrasonic transducer is arranged on the lower cover, and the vibration starting surface of the ultrasonic transducer extends into the tank body; the peripheral oil circuit comprises a bidirectional pump, an oil inlet pipeline, an oil outlet pipeline and an electromagnetic valve; after the oil inlet pipeline and the oil outlet pipeline are connected in parallel, one end of the oil inlet pipeline is communicated with the bidirectional pump, and the other end of the oil inlet pipeline is communicated with an oil port of the oil tank through the electromagnetic valve; the vacuum pump is communicated with the gas port through a pipeline; the PLC is respectively connected with the vacuum pump, the ultrasonic transducer and the bidirectional pump and controls the vacuum pump, the ultrasonic transducer and the bidirectional pump to be switched on and off; this application adopts the PLC controller to control the closing of vacuum pump, ultrasonic transducer and two-way pump, has realized the automated control to hydraulic oil gas separation process.
Description
Technical Field
The invention relates to the technical field of hydraulic oil treatment, in particular to an ultrasonic defoaming control system and a control method.
Background
At present, the gas in the hydraulic oil in the market is mainly precipitated by using a vacuum technology, but the gas is generally required to be kept stand for a long time in order to achieve the purpose of completely precipitating the gas, so that the method for precipitating the gas by keeping stand in vacuum has the problem of low efficiency, and the use of a user is limited to a certain extent.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a hydraulic oil ultrasonic defoaming control system, which can improve the gas precipitation efficiency of hydraulic oil.
Further, the invention provides a hydraulic oil ultrasonic defoaming method based on the control system.
The technical scheme adopted by the invention is as follows:
a hydraulic oil ultrasonic defoaming control system comprises an oil tank, a peripheral oil way, a vacuum pump and a PLC (programmable logic controller);
the oil tank comprises a tank body, an upper cover, a lower cover and an ultrasonic transducer; the upper cover is arranged at the upper end of the tank body, and an air port is formed in the upper cover; the lower cover is arranged at the lower end of the tank body, and an oil port is formed in the lower cover; the ultrasonic transducer is arranged on the lower cover, and the vibration starting surface of the ultrasonic transducer extends into the tank body;
the peripheral oil circuit comprises a bidirectional pump, an oil inlet pipeline, an oil outlet pipeline and an electromagnetic valve; after the oil inlet pipeline and the oil outlet pipeline are connected in parallel, one end of the oil inlet pipeline is communicated with the bidirectional pump, and the other end of the oil inlet pipeline is communicated with an oil port of the oil tank through the electromagnetic valve;
the vacuum pump is communicated with the air port through a pipeline;
and the PLC is respectively connected with the vacuum pump, the ultrasonic transducer and the bidirectional pump and used for controlling the opening and closing of the vacuum pump, the ultrasonic transducer and the bidirectional pump.
Further, still include pressure transmitter, this pressure transmitter is used for monitoring oil tank pressure data to send this pressure data to PLC controller.
Further, ultrasonic transducer includes main part, the face of shaking and locking shell, and the fixed one end that sets up at the main part of the face of shaking, locking shell cover establish at the other end of main part, and with main part screw-thread fit, the transverse dimension of the face of shaking is greater than the transverse dimension of main part.
Furthermore, the lower cover is provided with a mounting hole for mounting an ultrasonic transducer, the main body of the ultrasonic transducer penetrates through the mounting hole from the inner side of the lower cover, the other end of the main body is positioned at the outer side of the lower cover, and the main body is locked and fixed by adopting a locking shell.
Furthermore, an oil inlet check valve is arranged on the oil inlet pipeline, an oil outlet check valve is arranged on the oil outlet pipeline, and the direction of the oil inlet check valve is opposite to that of the oil outlet check valve.
Further, a first-stage filter a, a second-stage filter and a third-stage filter are sequentially arranged on the oil inlet pipeline and between the two-way pump and the oil inlet one-way valve; and a primary filter b is arranged on the oil outlet pipeline and between the electromagnetic valve and the oil outlet one-way valve.
Further, the electromagnetic valve is a normally closed electromagnetic valve.
Further, the application also provides a hydraulic oil ultrasonic defoaming control method based on the control system, which comprises the following steps:
oil pumping: the PLC receives an oil pumping signal, controls the opening of the electromagnetic valve and the forward starting of the bidirectional pump, and pumps hydraulic oil into the oil tank through the oil inlet pipeline;
and oil pumping stopping step: the PLC receives an oil pumping stop signal, controls the electromagnetic valve and the bidirectional pump to be closed, and finishes the work of leading in hydraulic oil;
defoaming step: the PLC receives the defoaming signal, controls the ultrasonic transducer and the vacuum pump to start, and carries out defoaming treatment on the hydraulic oil; after the treatment, the PLC controller controls the ultrasonic transducer and the vacuum pump to stop;
oil discharging step: and the PLC receives the oil discharge signal, controls the electromagnetic valve to be opened, controls the bidirectional pump to be reversely started, and discharges the hydraulic oil from the oil outlet pipeline.
An oil discharge stopping step: and the PLC receives an oil discharge stop signal, controls the electromagnetic valve and the bidirectional pump to be closed, and finishes the oil discharge work of hydraulic oil.
Further, in the defoaming step, the method further includes:
timing: the PLC controller receives timing data, wherein the timing data comprises first timing data and second timing data; when the first timing data reaches a preset value, controlling the ultrasonic transducer to stop;
a pressure detection step: the PLC receives real-time pressure data in the oil tank and starts or stops the vacuum pump according to the pressure data;
standing: and when the pressure data and the second timing data reach preset values, standing for 4 hours, and finishing the defoaming treatment of the hydraulic oil.
Further, the pressure detecting step: the PLC receives real-time pressure data in the oil tank and starts or stops the vacuum pump according to the pressure data; comprises that
When the pressure data reaches a preset low pressure value A, the PLC controller controls the vacuum pump to stop;
when the pressure rises to a preset high pressure value B, the PLC controls the vacuum pump to start.
By adopting the technical scheme, the invention has the following beneficial effects:
this application sets up ultrasonic transducer through the lower cover at the oil tank, and this ultrasonic transducer's the face of shaking stretches into the jar internal, when the oil tank defoaming, vibrates through ultrasonic transducer's high frequency, can accelerate gaseous the appearing in the hydraulic oil, has improved the gaseous efficiency that appears of hydraulic oil greatly, has improved hydraulic oil treatment quality simultaneously. The PLC is adopted to control the closing of the vacuum pump, the ultrasonic transducer and the bidirectional pump, and the automatic control of the hydraulic oil gas precipitation process is realized.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of an oil path of a hydraulic oil ultrasonic defoaming control system according to an embodiment of the present application;
FIG. 2 is a control schematic diagram of an embodiment of the present application;
FIG. 3 is a schematic diagram of an oil tank structure according to an embodiment of the present application;
FIG. 4 is a schematic view illustrating the connection between the upper cover and the lower cover of the oil tank according to the embodiment of the present application;
FIG. 5 is a schematic view of a lower cover structure according to an embodiment of the present application;
fig. 6 is a block diagram of a control method according to an embodiment of the present application.
The oil tank comprises a tank body 1, a lower cover 2, an ultrasonic transducer 3, an upper cover 4, a supporting seat 5, an oil port 6, a first sealing ring 7, a locking shell 8, an aviation socket 9, a screw rod 10, a nut 11, a spare oil port 12, a second sealing ring 13, a vibration starting surface 14, an oil tank 15, a vacuum pump 16, a bidirectional pump 17, an electromagnetic valve 18, an oil inlet check valve 19, an oil outlet check valve 20, a primary filter a21, a secondary filter 22, a tertiary filter 23, a primary filter b24, a pressure transmitter 25, an LED lamp strip 26, a display 27, a PLC (programmable logic controller) 28, a direct-current power supply 29, a leakage circuit breaker 30 and a power switch 31.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Referring to fig. 1 to 5, the ultrasonic defoaming control system for hydraulic oil of the present application includes an oil tank, a peripheral oil path, a vacuum pump 16 and a PLC controller 28; the oil tank comprises a tank body 1, an upper cover 4, a lower cover 2 and an ultrasonic transducer 3; the upper cover 4 is arranged at the upper end of the tank body 1, and an air port is formed in the upper cover 4; the lower cover 2 is arranged at the lower end of the tank body 1, and an oil port 6 is formed in the lower cover 2; the ultrasonic transducer 3 is arranged on the lower cover 2, and the vibration starting surface of the ultrasonic transducer extends into the tank body 1; the peripheral oil circuit comprises a bidirectional pump 17, an oil inlet pipeline, an oil outlet pipeline and an electromagnetic valve 18; after the oil inlet pipeline and the oil outlet pipeline are connected in parallel, one end of the oil inlet pipeline is communicated with the bidirectional pump 17, and the other end of the oil inlet pipeline is communicated with the oil port 6 of the oil tank through the electromagnetic valve 18; the solenoid valve 18 is a normally closed solenoid valve 18; the vacuum pump 16 is communicated with the gas port through a pipeline; the PLC 28 is respectively connected with the vacuum pump 16, the ultrasonic transducer 3 and the bidirectional pump 17, and controls the vacuum pump 16, the ultrasonic transducer 3 and the bidirectional pump 17 to be switched on and off.
When the device is used, the bidirectional pump 17 is communicated with hydraulic oil to be treated, the PLC 28 controls the bidirectional pump 17 to be started in the forward direction, the electromagnetic valve 18 is controlled to be electrified and conducted, so that the hydraulic oil is sucked into a peripheral oil way, and the hydraulic oil enters the oil tank through the bidirectional pump 17, the oil inlet pipeline and the electromagnetic valve 18 to complete the guiding work of the hydraulic oil; the PLC 28 controls the electromagnetic valve 18 to be closed, controls the vacuum pump 16 and the ultrasonic transducer 3 to be started, quickly separates out gas from the hydraulic oil under the double actions of ultrasonic oscillation and a vacuum environment, and stops the vacuum pump 16 and the ultrasonic transducer 3 after the oil tank is pumped to a target negative pressure state, so that the hydraulic oil treatment work is completed. When the hydraulic oil is led out, the PLC 28 controls the bidirectional pump 17 to be started reversely, the electromagnetic valve 18 is controlled to be electrified and conducted, and the hydraulic oil treated in the oil tank is driven by the bidirectional pump 17 to be discharged through the electromagnetic valve 18, the oil outlet pipeline and the bidirectional pump 17 in sequence, so that the hydraulic oil guiding work is completed.
This application sets up ultrasonic transducer 3 through the lower cover 2 at the oil tank, and this ultrasonic transducer 3's the face of shaking stretches into jar 1 insidely, when the defoaming to the oil tank, vibrates through ultrasonic transducer 3's high frequency, can accelerate the gaseous appearance in the hydraulic oil, has improved the gaseous efficiency that appears of hydraulic oil greatly, has improved the hydraulic oil treatment quality simultaneously. The PLC 28 is adopted to control the vacuum pump 16, the ultrasonic transducer 3 and the bidirectional pump 17 to be closed, and automatic control of the process of separating out the hydraulic oil gas is realized.
The ultrasonic transducer 3 is a commercially available product and is integrated on the lower cover 2, the ultrasonic transducer 3 is powered by 220V alternating current, the power is 50W, the resonant frequency is 40 +/-1.0 kHz, the resonant impedance is less than or equal to 25 omega, the static capacitance is 5200pF +/-10%, and the mechanical quality factor is greater than or equal to 2.0 kHz.
Preferably, the ultrasonic transducer 3 comprises a main body, an oscillation starting surface and a locking shell 8, the oscillation starting surface is fixedly arranged at one end of the main body, the locking shell 8 is sleeved at the other end of the main body and is in threaded fit with the main body, and the transverse size of the oscillation starting surface is larger than that of the main body.
The lower cover 2 is provided with a mounting hole for mounting the ultrasonic transducer 3, the main body of the ultrasonic transducer 3 penetrates through the mounting hole from the inner side of the lower cover 2, and because the transverse size of the vibration starting surface arranged at one end of the main body is larger than that of the main body, after the main body penetrates through the mounting hole from the inner side of the lower cover 2, the vibration starting surface cannot pass through the mounting hole and is positioned at the inner side of the lower cover 2; the other end of the body is located outside the lower cover 2 and is locked and fixed using a lock housing 8, thereby mounting the ultrasonic transducer 3 on the lower cover 2.
The other end of the main body of the ultrasonic transducer 3 is also provided with an aviation socket 9, and the ultrasonic transducer 3 is connected with the PLC 28 through the aviation socket 9.
Preferably, the upper cover 4 and the lower cover 2 are fixed on the tank body 11 by a screw 10. Specifically, a plurality of connecting holes are respectively formed in the upper cover 4 and the lower cover 2, the screw rod 10 penetrates through the connecting holes, and two ends of the screw rod are locked and fixed by nuts 11. The upper cover 4 and the lower cover 2 are respectively fixed at the two ends of the tank body 1 by the pulling force of the screw 10. The screw 10 can adopt an M5 screw 10, and the two ends of the screw 10 are fastened by adopting matched M5 nuts 11.
Preferably, first sealing rings 7 are arranged between the upper cover 4 and the tank body 1 and between the lower cover 2 and the tank body 1, and the first sealing rings 7 are O-shaped rubber rings; a second sealing ring 13 is arranged between the ultrasonic transducer 3 and the lower cover 2, and the second sealing ring 13 is an O-shaped rubber ring. Specifically, the second seal ring 13 is provided between the main body of the ultrasonic transducer 3 and the lower cover 2.
Preferably, a support seat 5 for supporting the oil tank is arranged at the lower side of the oil tank; the lower cover 2 can be further provided with a spare oil port 12, and the spare oil port 12 is normally plugged by a plug.
Preferably, an oil inlet check valve 19 is arranged on the oil inlet pipeline, an oil outlet check valve 20 is arranged on the oil outlet pipeline, and the direction of the oil inlet check valve 19 is opposite to that of the oil outlet check valve 20. When oil is guided, hydraulic oil can only be guided in through the oil inlet pipeline, and when oil is discharged, hydraulic oil can only be discharged through the oil outlet pipeline.
Preferably, a first-stage filter a21, a second-stage filter 22 and a third-stage filter 23 are sequentially arranged on the oil inlet pipeline and between the two-way pump 17 and the oil inlet one-way valve 19 and used for filtering hydraulic oil to be treated. A first-stage filter b24 is arranged on the oil outlet pipeline and between the electromagnetic valve 18 and the oil outlet one-way valve 20 and is used for filtering the led-out hydraulic oil.
Preferably, the present application further comprises a pressure transmitter 25, the pressure transmitter 25 being configured to monitor tank pressure data and transmit the pressure data to the PLC controller 28.
Specifically, in the defoaming and standing process of the hydraulic oil, the pressure transmitter 25 monitors pressure data in the oil tank in real time and sends the pressure data to the PLC controller 28, and the PLC controller 28 outputs a corresponding control instruction according to the pressure data.
Specifically, in the defoaming process, the pressure transmitter 25 monitors the pressure value in the oil tank in real time, and when the pressure value reaches a preset low pressure value a, the PLC controller 28 controls the vacuum pump 16 to stop. When the pressure transmitter 25 monitors that the pressure value rises to the high pressure value B, the pressure value B is greater than the pressure value a, the PLC controller 28 controls the vacuum pump 16 to start again, and when the pressure value falls to a, the PLC controller controls the vacuum pump 16 to stop again.
During the standing process, the pressure transmitter 25 monitors the pressure value in the oil tank in real time, and if the pressure value rises to a certain value, there is a possibility that the oil tank has a gas leakage failure.
Preferably, the present application further comprises a display 27, wherein the display 27 displays the hydraulic oil processing state, such as the oil pumping state, the defoaming state, the standing state or the oil discharging state, in real time.
Preferably, the present application further includes an LED strip 26, and the LED strip 26 is used for emitting lights with different colors to play a role in prompting.
Preferably, in the present application, the vacuum pump 16 and the ultrasonic transducer 3 are connected to the 220V commercial power through the electrical leakage breaker 30, and the commercial power is used for supplying power. The earth leakage breaker 30 provides earth leakage protection for the entire circuit.
A power switch 31 for controlling the on/off of the entire circuit is also provided between the earth leakage breaker 30 and the vacuum pump 16.
Preferably, the present application further comprises a dc power supply 29, and the dc power supply 29 is respectively connected to the PLC controller 28, the display 27, the motor control box of the bidirectional pump 17, the electromagnetic valve 18, the LED strip 26, and the pressure transmitter 25, and converts 220V ac power into 24V dc power to supply power to the PLC controller 28, the display 27, the motor control box of the bidirectional pump 17, the electromagnetic valve 18, the LED strip 26, and the pressure transmitter 25.
Further, this application still provides a hydraulic oil supersound defoaming control method, includes following step:
s1, oil pumping step: the PLC 28 receives the oil pumping signal, controls the electromagnetic valve 18 to be opened, and the bidirectional pump 17 to be started in the forward direction, and pumps the hydraulic oil into the oil tank through the oil inlet pipeline.
S2, oil pumping stopping step: and the PLC 28 receives the oil pumping stop signal, controls the electromagnetic valve 18 and the bidirectional pump 17 to be closed, and finishes the work of introducing hydraulic oil.
S3, defoaming step: the PLC 28 receives the defoaming signal, controls the ultrasonic transducer 3 and the vacuum pump 16 to start, and performs defoaming treatment on the hydraulic oil; after the treatment, the PLC controller 28 controls the ultrasonic transducer 3 and the vacuum pump 16 to stop.
S4, oil discharging step: the PLC 28 receives the oil discharge signal, controls the electromagnetic valve 18 to be opened, and controls the bidirectional pump 17 to be started reversely, so that the hydraulic oil is discharged from the oil outlet pipeline.
S5, oil drainage stopping step: and the PLC 28 receives an oil discharge stop signal, controls the electromagnetic valve 18 and the bidirectional pump 17 to be closed, and finishes the oil discharge work of the hydraulic oil.
In step S1, in the oil pumping step, the PLC controller 28 determines whether oil drainage and defoaming are being performed after receiving the oil pumping signal; if yes, the display 27 displays that the oil discharge and defoaming are in progress and the operation is needed to be stopped; if not, the oil extraction and defoaming work is not carried out, and oil pumping can be carried out, the PLC 28 controls the electromagnetic valve 18 to be opened, controls the front side of the bidirectional pump 17 to be started, and pumps the hydraulic oil into the oil tank through the oil inlet pipeline; during the pumping process, the display 27 shows that pumping is in progress.
In the step S2, the oil pumping stopping step, when the oil pumping reaches the required oil pumping amount, sending an oil pumping stopping signal to the PLC controller 28, and after receiving the signal by the PLC controller 28, controlling the electromagnetic valve 18 and the bidirectional pump 17 to close, and ending the oil pumping; at this time, the display 27 shows that the defoaming is not completed.
In step S3 and the defoaming step, the PLC controller 28 determines whether oil pumping and oil discharging are in progress after the defoaming signal is received; if yes, the display 27 displays that oil pumping and oil discharging are in progress and the operation is carried out after business needs to be good; if not, it indicates that oil pumping and oil discharging are not performed and defoaming can be performed, the PLC controller 28 controls the ultrasonic transducer 3 and the vacuum pump 16 to start, and starts the first counter and the second counter to count at the same time. At this time, the display 27 shows that defoaming is in progress.
S31, timing step: the PLC controller 28 receives timing data, which includes first timing data and second timing data, the first timing data being timing data of a first counter, the second timing data being timing data of a second counter; when the first timing data reaches a preset value, the ultrasonic transducer 3 is controlled to stop, and then the ultrasonic transducer 3 stops vibrating.
S32, a pressure detection step: the PLC controller 28 receives real time pressure data from the tank and activates or deactivates the vacuum pump 16 based on the pressure data.
Specifically, the pressure transmitter 25 monitors the pressure value in the oil tank in real time, and when the pressure value reaches a preset low pressure value a, the PLC controller 28 controls the vacuum pump 16 to stop, and at this time, the second counter is still timing; when the pressure transmitter 25 monitors that the pressure value rises to the high pressure value B, the pressure value B is greater than the pressure value a, the PLC controller 28 controls the vacuum pump 16 to start again, and when the pressure value falls to a, the PLC controller controls the vacuum pump 16 to stop again. And the process is circulated.
S33, standing: and when the pressure data and the second timing data reach preset values, standing for 4 hours, and finishing the defoaming treatment of the hydraulic oil.
When the pressure value reaches a preset low pressure value A and the second timing data reaches a preset value, standing is started, a third counter is started to start timing, timing is finished after 4 hours, and defoaming treatment of the hydraulic oil is completed. At this time, the display 27 shows that the defoaming process is completed.
Through this application ultrasonic transducer vibrations are handled, and gas in the hydraulic oil can appear fast, and after the evacuation was accomplished, only need stew 4 hours can, for prior art, shortened the stationary time greatly, improved gaseous efficiency of appearing.
Generally, the first timing data preset value is smaller than the second timing data preset value, that is, the ultrasonic transducer 3 and the vacuum pump 16 start to start simultaneously, and after the first timing data preset value is reached, the ultrasonic transducer 3 stops, and at this time, the vacuum pump 16 is still in a start state, that is, the vacuum pumping operation is still being performed. When the pressure value reaches the low pressure value A, the vacuum pump 16 is stopped, and at this time, the hydraulic oil in the oil tank may still separate out gas; the pressure in the oil tank gradually rises along with the separation of the gas, and when the pressure value reaches a high pressure value B, the vacuum pump 16 is started again; until the pressure value is reduced to A, judging whether the second timing data reaches a preset value, if so, entering a standing step, and starting a third timer to start standing timing; if not, continuing to monitor the pressure value and the second timing data.
In step S4, an oil discharge step, in which an oil discharge signal is input after defoaming is completed, and the PLC controller 28 determines whether oil pumping is being performed or not after receiving the oil discharge signal; if yes, the display 27 displays that the pumping is in progress and needs to be stopped and then operated; if not, the PLC 28 judges whether defoaming is carried out or not; if yes, the display 27 shows that the defoaming operation is not completed, if oil is to be drained, the defoaming is forcibly stopped or the defoaming is waited to be completed; if not, the PLC 28 controls the electromagnetic valve 18 to be opened, the bidirectional pump 17 is started reversely, and the hydraulic oil is discharged from the oil outlet pipeline. At this time, the display 27 displays that oil drainage is in progress.
In step S5, a drain stop step of sending a drain stop signal to the PLC controller 28 when the drain reaches the required drain amount, and after receiving the drain stop signal, the PLC controller 28 controls the solenoid valve 18 and the bidirectional pump 17 to close, thereby ending the drain of the hydraulic oil.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral combinations thereof; may be an electrical connection; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems, and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, system, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, systems, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. The ultrasonic defoaming control method for the hydraulic oil is characterized by being based on a system, wherein the system comprises an oil tank, a peripheral oil way, a vacuum pump (16) and a PLC (programmable logic controller) (28);
the oil tank comprises a tank body (1), an upper cover (4), a lower cover (2) and an ultrasonic transducer (3); the upper cover (4) is arranged at the upper end of the tank body (1), and an air port is formed in the upper cover (4); the lower cover (2) is arranged at the lower end of the tank body (1), and an oil port (6) is formed in the lower cover (2); the ultrasonic transducer (3) is arranged on the lower cover (2), and the vibration starting surface of the ultrasonic transducer extends into the tank body (1);
the peripheral oil circuit comprises a bidirectional pump (17), an oil inlet pipeline, an oil outlet pipeline and an electromagnetic valve (18); after the oil inlet pipeline and the oil outlet pipeline are connected in parallel, one end of the oil inlet pipeline is communicated with a bidirectional pump (17), and the other end of the oil inlet pipeline is communicated with an oil port (6) of the oil tank through an electromagnetic valve (18);
the vacuum pump (16) is communicated with the air port through a pipeline;
the PLC (28) is respectively connected with the vacuum pump (16), the ultrasonic transducer (3) and the bidirectional pump (17) and controls the vacuum pump (16), the ultrasonic transducer (3) and the bidirectional pump (17) to be turned on and turned off;
the system also comprises a pressure transmitter (25), wherein the pressure transmitter (25) is used for monitoring the pressure data of the oil tank and transmitting the pressure data to the PLC (28);
in the defoaming and standing process of hydraulic oil, a pressure transmitter (25) monitors pressure data in the oil tank in real time and transmits the pressure data to a PLC (programmable logic controller) (28), and the PLC (28) outputs a corresponding control instruction according to the pressure data;
the control method comprises the following steps:
oil pumping: the PLC (28) receives an oil pumping signal, controls the electromagnetic valve (18) to be opened and the bidirectional pump (17) to be started in the forward direction, and pumps hydraulic oil into the oil tank through the oil inlet pipeline;
and oil pumping stopping step: the PLC (28) receives an oil pumping stop signal, controls the electromagnetic valve (18) and the bidirectional pump (17) to be closed, and finishes the work of leading in hydraulic oil;
defoaming step: the PLC (28) receives defoaming signals, controls the ultrasonic transducer (3) and the vacuum pump (16) to be started, and performs defoaming treatment on hydraulic oil; after treatment, the PLC controller (28) controls the ultrasonic transducer (3) and the vacuum pump (16) to stop;
oil discharging: the PLC (28) receives an oil discharge signal, controls the electromagnetic valve (18) to be opened, controls the bidirectional pump (17) to be started reversely, and discharges hydraulic oil from the oil outlet pipeline;
an oil discharge stopping step: the PLC (28) receives an oil discharge stop signal, and controls the electromagnetic valve (18) and the bidirectional pump (17) to be closed to finish the oil discharge work of hydraulic oil;
in the defoaming step, the method further comprises:
timing: the PLC controller (28) receiving timing data, the timing data including first timing data and second timing data; when the first timing data reaches a preset value, controlling the ultrasonic transducer (3) to stop;
a pressure detection step: the PLC (28) receives real-time pressure data in the oil tank and starts or stops the vacuum pump (16) according to the pressure data;
standing: when the pressure data and the second timing data reach preset values, standing for 4 hours, and finishing defoaming treatment of the hydraulic oil;
the pressure detection step: the PLC (28) receives real-time pressure data in the oil tank and starts or stops the vacuum pump (16) according to the pressure data; comprises that
When the pressure data reaches a preset low pressure value A, the PLC (28) controls the vacuum pump (16) to stop;
when the pressure rises to a preset high pressure value B, the PLC controller (28) controls the vacuum pump (16) to start.
2. The ultrasonic defoaming control method for hydraulic oil according to claim 1, wherein the ultrasonic transducer (3) comprises a main body, a vibration starting surface and a locking shell (8), the vibration starting surface is fixedly arranged at one end of the main body, the locking shell (8) is sleeved at the other end of the main body and is in threaded fit with the main body, and the transverse dimension of the vibration starting surface is greater than that of the main body.
3. The hydraulic oil ultrasonic defoaming control method according to claim 2, wherein the lower cover (2) is provided with a mounting hole for mounting the ultrasonic transducer (3), the main body of the ultrasonic transducer (3) passes through the mounting hole from the inner side of the lower cover (2), and the other end of the main body is located on the outer side of the lower cover (2) and is locked and fixed by a locking shell (8).
4. The ultrasonic defoaming control method for hydraulic oil according to claim 1, wherein an oil inlet check valve (19) is arranged on the oil inlet pipeline, an oil outlet check valve (20) is arranged on the oil outlet pipeline, and the direction of the oil inlet check valve (19) is opposite to that of the oil outlet check valve (20).
5. The hydraulic oil ultrasonic defoaming control method according to claim 4, wherein a first-stage filter a (21), a second-stage filter (22) and a third-stage filter (23) are sequentially arranged on the oil inlet pipeline and between the two-way pump (17) and the oil inlet check valve (19); and a primary filter b (24) is arranged on the oil outlet pipeline and between the electromagnetic valve (18) and the oil outlet one-way valve (20).
6. The hydraulic oil ultrasonic defoaming control method according to claim 1, wherein the solenoid valve (18) is a normally closed solenoid valve (18).
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