CN108131353B - Hydraulic leakage-proof control device - Google Patents
Hydraulic leakage-proof control device Download PDFInfo
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- CN108131353B CN108131353B CN201810045389.XA CN201810045389A CN108131353B CN 108131353 B CN108131353 B CN 108131353B CN 201810045389 A CN201810045389 A CN 201810045389A CN 108131353 B CN108131353 B CN 108131353B
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- 239000003921 oil Substances 0.000 claims abstract description 128
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 59
- 238000012544 monitoring process Methods 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000004880 explosion Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 206010033799 Paralysis Diseases 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
A hydraulic leakage-proof control device belongs to the technical field of hydraulic detection equipment and is used for monitoring and controlling oil leakage of a hydraulic cylinder. The technical proposal is as follows: the monitoring working part comprises a first three-position four-way reversing valve, a first leakage preventer and a second leakage preventer, wherein two external ports of the first three-position four-way reversing valve are respectively connected with a hydraulic oil pipeline, two output ports of the first three-position four-way reversing valve are respectively connected with oil inlets at two ends of a piston cylinder of a monitored hydraulic cylinder through a hydraulic oil pipeline, and the first leakage preventer and the second leakage preventer are respectively arranged in the hydraulic oil pipelines at two ends of the hydraulic cylinder. The displacement sensor, the electronic bin, the magnetic ring, the measuring rod and other parts of the leakage preventer can monitor the hydraulic oil quantity in the hydraulic cylinder, and when the hydraulic cylinder leaks oil, the leakage preventer can automatically cut off the connection with the whole hydraulic system. The invention creatively adopts the leak preventer device to monitor the oil quantity in different cavities of the monitored hydraulic cylinder, and can accurately judge whether the hydraulic cylinder leaks oil.
Description
Technical Field
The invention relates to a device for reducing and detecting leakage of a hydraulic system and preventing shutdown accidents caused by paralysis of the hydraulic system due to oil leakage, and belongs to the technical field of hydraulic detection equipment.
Background
In a hydraulic system, the hydraulic pipeline has more oil pipes, more elbows, more connecting hoses, longer pipelines, easy damage and deformation, and easy oil leakage when the hydraulic cylinder is used for a long time. In the withdrawal and straightening machine and the sector section of the multi-strand continuous casting machine, a plurality of hydraulic cylinders are arranged, pipelines are densely distributed at the lowest part of equipment, and oil leakage is easy to occur under the conditions of high temperature and high humidity. In the online production process, cooling water is arranged on the hydraulic cylinder and the hydraulic pipeline, and is adhered to the lower parts of the withdrawal and straightening sections and the fan-shaped sections, so that the hydraulic cylinder and the hydraulic pipeline are not easy to find when oil leakage occurs. When large oil leakage occurs, such as pipe explosion and cylinder explosion, production accidents are caused by shutdown, and normal production of the continuous casting machine is affected.
At present, the following hydraulic oil leakage and detection methods are mainly available:
1. the oil leakage monitoring mode of the hydraulic pump station is adopted, namely the liquid level of the oil tank is monitored, and the alarm is given when the liquid level fluctuation is monitored. The monitoring mode is adopted in the device and the method for detecting the oil leakage of hydraulic oil disclosed in Chinese patent number 201610096652.9. However, in practical use, it is found that this monitoring mode is suitable for a simple hydraulic system, a short hydraulic line, and a hydraulic cylinder installed in a place with good environmental conditions and easy inspection. However, with the improvement of the efficiency of the hydraulic station pump, one oil tank is connected with the oil return of more than ten or more than ten hydraulic cylinders, the hydraulic cylinders and pipelines are installed in severe environments such as high temperature, and even if the oil leakage is known, the oil leakage of the oil pipe and the oil cylinder is not easy to check, and the hydraulic station is stopped for paralysis after the searching time is long, so that large-area equipment accidents are caused.
2. The adopted image acquisition mode is used for scanning the fault part, and the method uses optical and electronic elements such as a camera and the like, has high investment in large-scale hydraulic equipment and is not suitable for severe environments.
3. And monitoring oil leakage by adopting a pressure sensor. Oil leakage alarm is carried out when pressure fluctuation occurs through pressure monitoring of a hydraulic pump station, and false alarm phenomenon can occur frequently due to the complexity of operation pressure fluctuation of a hydraulic system. The method for judging the oil leakage and the pressure fluctuation of the hydraulic station disclosed in the Chinese patent number 201610370718.9 is characterized in that the oil leakage and the pressure fluctuation of the hydraulic station are judged from two aspects of 'change rate' and 'accumulation amount' by utilizing the instantaneous monitoring of the liquid level and the pressure, and the instantaneous monitoring alarm and the historical monitoring alarm are respectively carried out. The method is influenced by the running state of equipment, pressure fluctuation, liquid level fluctuation and other factors, and false alarm can also occur.
The above hydraulic oil leakage and detection methods have the following same limitations: firstly, whether the liquid level alarm or the pressure alarm is carried out, the overall detection result of the hydraulic system is a detection result, oil leakage of a specific pipeline or oil cylinder is unknown, and the hydraulic system is incapable of detecting oil leakage on line under the conditions that a withdrawal and straightening machine like a continuous casting machine and sector-section hydraulic equipment are densely distributed in high-temperature, high-humidity and external-spraying cooling water environments and the oil leakage cannot be detected on line; secondly, the result of the hydraulic oil leakage detection can only stay on the alarm, the oil leakage point can not be automatically cut off, the phenomenon that the hydraulic oil in the oil tank in the hydraulic station is leaked easily occurs, the pump is stopped and the machine is stopped, all on-line equipment is paralyzed, and the accident is enlarged. If burst large amount of hydraulic oil leakage occurs such as pipe explosion and cylinder explosion, even if the oil leakage point is not found after the alarm, the oil in the hydraulic oil tank is leaked, and the production accident is stopped.
Disclosure of Invention
The invention aims to solve the technical problem of providing the hydraulic leakage-proof control device, which can monitor oil leakage, improve the detection precision of hydraulic oil leakage, reduce the range of oil leakage detection, automatically cut off oil sources when a large amount of hydraulic oil leakage occurs suddenly, prevent the hydraulic oil in a hydraulic oil tank from completely leaking, cause larger equipment accidents and is suitable for being used under various severe and complex working conditions.
The technical scheme for solving the technical problems is as follows:
the hydraulic leakage-proof control device comprises a monitoring working part, wherein the monitoring working part comprises a first three-position four-way reversing valve, a first leakage preventer and a second leakage preventer, two external ports of the first three-position four-way reversing valve are respectively connected with a hydraulic oil pipeline, two output ports of the first three-position four-way reversing valve are respectively connected with oil inlets at two ends of a piston cylinder of a monitored hydraulic cylinder through a hydraulic oil pipeline, and the first leakage preventer and the second leakage preventer are respectively arranged in the hydraulic oil pipelines at two ends of the hydraulic cylinder; the first leakage preventer and the second leakage preventer respectively comprise a front end cover, a cylinder body, a piston, a rear end cover, a displacement sensor, an electronic bin, a magnetic ring and a measuring rod, wherein the front end cover, the rear end cover and the cylinder body form a closed structure, the piston which moves axially is arranged in the cylinder body, an oil port is respectively arranged on the front end cover and the rear end cover, the electronic bin is arranged on the outer side of the front end cover, the displacement sensor is arranged in the front end cover, the displacement sensor is connected with the electronic bin, the signal output end of the electronic bin is connected with the signal input end of the industrial personal computer through a cable, the measuring rod is arranged on the central axis of the cylinder body, the piston is provided with a central hole which is in sliding fit with the measuring rod, the magnetic ring is arranged on the piston, the magnetic ring is opposite to the displacement sensor in the axial direction, and the oil ports of the front end cover and the rear end cover of the first leakage preventer and the second leakage preventer are respectively connected with a hydraulic pipeline leading to a monitored hydraulic cylinder.
According to the hydraulic leakage-proof control device, the first one-way valve is arranged between one external port of the first three-position four-way reversing valve and the hydraulic oil pipeline, and sealing structures are respectively arranged between the outer wall of the piston and the cylinder body and between the central hole of the piston and the measuring rod.
The hydraulic leakage-proof control device further comprises an auxiliary part, wherein the auxiliary part comprises a second three-position four-way reversing valve, a third three-position four-way reversing valve, a first hydraulic valve, a second one-way valve, a third one-way valve and a fourth one-way valve, and further comprises a first leakage preventer and a second leakage preventer of a monitoring working part, two external ports of the second three-position four-way reversing valve of the auxiliary part are respectively connected with a hydraulic oil pipeline, one output port of the second three-position four-way reversing valve is connected with a reversing end of the second hydraulic valve through a pipeline, meanwhile, the output port is connected with a rear end cover oil port of the second leakage preventer and a rod cavity oil port of a hydraulic cylinder through a fourth one-way valve, and the other output port of the second three-position four-way reversing valve is connected with a reversing end cover oil port of the first leakage preventer and a rodless cavity oil port of the hydraulic cylinder through a second one-way valve.
According to the hydraulic leakage-proof control device, one external port of the third three-position four-way reversing valve of the auxiliary part is connected with the hydraulic oil pipeline through the third one-way valve, one output port of the third three-position four-way reversing valve is connected with a pipeline behind the fourth one-way valve connected with one output port of the second three-position four-way reversing valve, and the other output port of the third three-position four-way reversing valve is connected on a connecting pipeline between the rodless cavity of the hydraulic cylinder and the first leakage preventer.
The beneficial effects of the invention are as follows:
the working part of the invention is provided with the leakage preventer on the oil inlet pipelines of the rod cavity and the rodless cavity of the monitored hydraulic cylinder, the displacement sensor, the electronic bin, the magnetic ring, the measuring rod and other parts of the leakage preventer can monitor the hydraulic oil quantity in the hydraulic cylinder, and when the hydraulic cylinder leaks oil, the leakage preventer can automatically cut off the connection with the whole hydraulic system, so that the range of oil leakage accidents can not be expanded any more, and the hydraulic system can not stop and break down even if the hydraulic cylinder is exploded or exploded. Meanwhile, the auxiliary part monitors quantitative hydraulic oil in each leakage preventer, each pipeline and one cavity of the hydraulic cylinder, when oil leakage occurs, the range for searching after alarming is small and accurate, and timely searching and processing are facilitated.
The invention is the initiative of hydraulic oil leakage monitoring and control, creatively adopts the leak preventer device to monitor the oil quantity in different cavities of the monitored hydraulic cylinder, can accurately judge whether the hydraulic cylinder leaks oil, particularly the hydraulic cylinder is positioned in the equipment densely distributed and is positioned in the environment with high temperature, high humidity and external spraying cooling water, under the condition that the online inspection of the leaked oil is difficult, the equipment which can accurately detect the leaked oil is more capable of detecting, opens up a new way for controlling the leakage of the hydraulic equipment and pipelines, provides powerful technological support for ensuring the normal operation of production, and has remarkable economic benefit.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural view of the leakage preventer.
The figures are labeled as follows: the hydraulic control system comprises a first one-way valve 1, a first three-position four-way reversing valve 2, a second three-position four-way reversing valve 3, a first hydraulic valve 4, a second one-way valve 5, a second hydraulic valve 6, a first leakage preventer 7, a second leakage preventer 8, a hydraulic cylinder 9, a third three-position four-way reversing valve 10, a third one-way valve 11, a fourth one-way valve 12, a front end cover oil port 13, a magnetic ring 14, a measuring rod seal 15, a piston seal 16, a piston 17, a cylinder 18, a measuring rod 19, a rear end cover oil port 20, a rear end cover 21, a rear cavity 22, a front cavity 23, a displacement sensor 24, an electronic bin 25 and a front end cover 26.
Detailed Description
The invention includes monitoring the working portion and the auxiliary portion. The leakage-proof device of the monitoring working part is used for monitoring the oil quantity of hydraulic oil in the hydraulic cylinder, and when the hydraulic cylinder leaks oil, the monitoring working part automatically cuts off the connection between the hydraulic cylinder and the whole hydraulic system, so that the range of oil leakage accidents can not be expanded any more, and the shutdown paralysis of the hydraulic system is avoided. The auxiliary part has the functions of: filling oil into the leak preventer and the oil cylinder after the leak preventer is initially installed; oil is replenished after oil leakage treatment of a pipeline or an oil cylinder; a backup control system is used in an emergency situation.
Fig. 1 shows that the monitoring working part consists of a first one-way valve 1, a first three-position four-way reversing valve 2, a first leakage preventer 7 and a second leakage preventer 8. One external port of the first three-position four-way reversing valve 2 is connected with an oil return pipeline of hydraulic oil through a first one-way valve 1, the other external port of the first three-position four-way reversing valve 2 is connected with a hydraulic oil pipeline, two control ports of the first three-position four-way reversing valve 2 are respectively connected with oil inlets at two ends of a piston cylinder of a monitored hydraulic cylinder 9 through hydraulic oil pipelines, and a first leakage preventer 7 and a second leakage preventer 8 are respectively installed in the hydraulic oil pipelines at two ends of the hydraulic cylinder 9.
Fig. 2 shows that the first leakage preventer 7 and the second leakage preventer 8 have the same structure. The device comprises a front end cover 26, a cylinder 18, a piston 17, a rear end cover 21, a displacement sensor 24, an electronic bin 25, a magnetic ring 14 and a measuring rod 19.
Fig. 2 shows that the front end cover 26, the rear end cover 21 and the cylinder 18 form a closed structure, the axially moving piston 17 is arranged in the cylinder 18, and a piston seal 16 is arranged between the outer wall of the piston 17 and the cylinder 18. The front end cover 26 and the rear end cover 21 are respectively provided with a front end cover oil port 13 and a rear end cover oil port 20, which are used for conveying oil into and discharging oil from the cylinder bodies at the two ends of the piston 17, so as to achieve the purpose of pushing the piston 17 to move. The front end cover oil ports 13 of the two leak-proof devices are connected with the output oil ports leading to the first three-position four-way reversing valve, and the rear end cover oil ports 20 are connected with hydraulic pipelines leading to two ends of the monitoring hydraulic cylinder 9.
Fig. 2 shows that the electronic bin 25 is mounted on the outer side of the front end cover 26, the displacement sensor 24 is mounted in the front end cover 26, and the signal output end of the electronic bin 25 is connected with the signal input end of the industrial personal computer through a cable. The measuring rod 19 is installed on the central axis of the cylinder 18, the piston 17 is provided with a central hole in sliding fit with the measuring rod 19, and the magnetic ring 14 is installed on the piston 17. When the piston 17 moves, the magnetic ring is driven to move, the displacement sensor 24 transmits the position information of the magnetic ring 14 to the electronic bin 25, and the electronic bin 25 transmits an output signal to the industrial personal computer. A measuring rod seal 15 is arranged between the central hole of the piston and the measuring rod 19, so that hydraulic oil in the cylinder bodies at two sides of the piston 17 is prevented from flowing along the measuring rod 19.
The volume of the inside of the cylinder body 18 of the first leakage preventer 7 or the second leakage preventer 8 is at least 2 times of the volume of the inner cavity of the hydraulic cylinder 9, when all hydraulic oil in the first leakage preventer 7 or the second leakage preventer 8 fills the rod cavity or the rodless cavity of the hydraulic cylinder 9, the hydraulic oil left in the first leakage preventer 7 or the second leakage preventer 8 is the oil for monitoring and measuring, and the quantity of the oil is measured by the displacement sensor 24 and is transmitted to the industrial personal computer.
Fig. 1 shows that the auxiliary part of the invention comprises a second three-position four-way reversing valve 3, a first hydraulic valve 4, a second one-way valve 5, a second hydraulic valve 6, a third three-position four-way reversing valve 10, a third one-way valve 11 and a fourth one-way valve 12, and also comprises a first leak preventer 7 and a second leak preventer 8 for monitoring the working part.
Fig. 1 shows that an external port P and a port T of the second three-position four-way reversing valve 3 are respectively connected with a hydraulic oil pipeline, a B output port of the second three-position four-way reversing valve 3 is connected with a reversing end of the second hydraulic valve 6 through a pipeline, and a B output port of the second three-position four-way reversing valve 3 is connected with a rear end cover oil port 20 of the second leak preventer 8 and a rod cavity oil port of the hydraulic cylinder 9 through a fourth one-way valve 12; the output port A of the second three-position four-way reversing valve 3 is connected with the reversing end of the first hydraulic valve 4 through a pipeline, and meanwhile, the output port A of the second three-position four-way reversing valve 3 is connected with the rear end cover oil port 20 of the first leak preventer 7 and the rodless cavity oil port of the hydraulic cylinder 9 through a second one-way valve 5.
Fig. 1 shows that an external port of the third three-position four-way reversing valve 10 is connected with a hydraulic oil return pipeline through a third one-way valve 11, an output port A of the third three-position four-way reversing valve 10 is connected with a pipeline behind a fourth one-way valve 12 connected with an output port B of the second three-position four-way reversing valve 3, the pipeline is respectively connected with a rear end cover oil port 20 of the second leak preventer 8, a rod cavity oil port of the hydraulic cylinder 9 and the first hydraulic valve 4, an output port B of the third three-position four-way reversing valve 10 is connected with a connecting pipeline between the first leak preventer 7 and a rodless cavity of the hydraulic cylinder 9, and the connecting point is also connected with an output port pipeline A of the second three-position four-way reversing valve 3 and the second hydraulic valve 6.
The working process of the invention is as follows:
1. preparation work
(1) The electromagnet 1DT and the electromagnet 2DT of the first three-position four-way reversing valve 2 are not electrified, the electromagnet 5DT and the electromagnet 6DT of the third three-position four-way reversing valve 10 are not electrified, the electromagnet 3DT of the second three-position four-way reversing valve 3 is electrified, the electromagnet 4DT is deenergized, and the second hydraulic valve 6 reverses under the action of pressure control oil.
The pressure oil is output from the port B of the second three-position four-way reversing valve 3, enters the rear cavity 22 of the second leakage preventer 8 and the rod cavity of the hydraulic cylinder 9 through the third one-way valve 12, the pressure oil entering the rear cavity 22 of the second leakage preventer 8 from the rear end cover oil port 20 pushes the piston 17 to move leftwards to cling to the front end cover 26, hydraulic oil in the front cavity 23 of the second leakage preventer 8 enters from the port B of the first three-position four-way valve 2 through the front end cover oil port 13 and the hydraulic pipeline, and the valve core of the first one-way valve 1 is jacked up to enter the oil return pipeline to flow back to the oil tank. The pressure oil entering the rod cavity of the hydraulic cylinder 9 enables the piston of the hydraulic cylinder to move to the bottom of the cylinder, the oil without the rod cavity of the hydraulic cylinder 9 enters from the port A of the first three-position four-way reversing valve 2 through the second hydraulic valve 6, and the valve core of the first one-way valve 1 is jacked up to enter an oil return pipeline to flow back to an oil tank.
(2) The electromagnet 1DT and the electromagnet 2DT of the first three-position four-way reversing valve 2 are not electrified, the electromagnet 5DT and the electromagnet 6DT of the third three-position four-way reversing valve 10 are not electrified, the electromagnet 4DT of the second three-position four-way reversing valve 3 is electrified, the electromagnet 3DT is deenergized, and the first hydraulic valve 4 reverses under the action of pressure control oil.
The pressure oil enters the rear cavity 22 of the first leak preventer 7 and the rodless cavity of the hydraulic cylinder 9 simultaneously through the second one-way valve 5, the pressure oil entering the rear cavity 22 of the first leak preventer 7 through the rear end cover oil port 20 of the first leak preventer 7 pushes the piston 17 to move leftwards to cling to the front end cover 26, hydraulic oil in the front cavity 23 of the first leak preventer 7 enters through the front end cover oil port 13 and a hydraulic pipeline through the port A of the first three-position four-way valve 2, and the valve core of the first one-way valve 1 is jacked up to enter an oil return pipeline to flow back to the oil tank. The pressure oil entering the rodless cavity of the hydraulic cylinder 9 enables the piston of the hydraulic cylinder to move to the bottom of the cylinder, the oil with the rod cavity of the hydraulic cylinder 9 enters from the port B of the first three-position four-way reversing valve 2 through the first hydraulic valve 4, and the valve core of the first one-way valve 1 is jacked up to enter an oil return pipeline to flow back to an oil tank.
(3) The electromagnets 1DT and 2DT of the first three-position four-way reversing valve 2 are not electrified, the electromagnets 5DT and 6DT of the third three-position four-way reversing valve 10 are not electrified, the electromagnets 4DT and 3DT of the second three-position four-way reversing valve 3 are repeatedly and alternately circularly electrified, and the electrification time of the electromagnets is enough to enable the piston 17 of the first leakage preventer 7 or the second leakage preventer 8 and the piston of the hydraulic cylinder 9 to reach the bottom of the cylinder barrel. The first leakage preventer 7 and the second leakage preventer 8 are filled with hydraulic oil, and bubbles in the oil are discharged out of the system along with alternate circulation.
(4) Preparation before normal operation
After the electromagnet 4DT and the electromagnet 3DT of the second three-position four-way reversing valve 3 are repeatedly and alternately circulated to stop the power supply, if the piston of the hydraulic cylinder 9 is at the bottom of the lower part of the cylinder barrel, the electromagnet 3DT and the electromagnet 4DT of the second three-position four-way reversing valve 3 are not powered on, the electromagnet 1DT of the first three-position four-way reversing valve 2 and the electromagnet 6DT of the third three-position four-way reversing valve 10 are powered on simultaneously, and the electromagnet 2DT of the first three-position four-way reversing valve 2 and the electromagnet 5DT of the third three-position four-way reversing valve 10 are powered off simultaneously until the hydraulic cylinder piston reaches the upper bottom of the cylinder barrel of the hydraulic cylinder 9; if the piston of the hydraulic cylinder 9 is at the upper bottom of the cylinder barrel, the electromagnet 3DT and the electromagnet 4DT of the second three-position four-way reversing valve 3 are not powered, the electromagnet 2DT of the first three-position four-way reversing valve 2 and the electromagnet 5DT of the third three-position four-way reversing valve 10 are powered simultaneously, and the electromagnet 1DT of the first three-position four-way reversing valve 2 and the electromagnet 6DT of the third three-position four-way reversing valve 10 are powered off simultaneously until the hydraulic cylinder piston reaches the lower bottom of the cylinder barrel of the hydraulic cylinder 9.
The hydraulic oil in the first leakage preventer 7 and the hydraulic pipeline to the hydraulic cylinder 9 is the object for monitoring oil leakage, and whether the oil leakage and the oil leakage amount from the hydraulic pipeline from the first leakage preventer 7 to the hydraulic pipeline without rod cavity of the hydraulic cylinder 9 and the hydraulic pipeline without rod cavity of the hydraulic cylinder 9 can be known through the monitoring of the hydraulic oil; meanwhile, the hydraulic oil in the second leakage preventer 8 and the hydraulic pipeline to the hydraulic cylinder 9 is also an object for monitoring oil leakage, and whether the oil leakage and the oil leakage amount from the second leakage preventer 8 to the hydraulic pipeline with the rod cavity of the hydraulic cylinder 9 and the rod cavity of the hydraulic cylinder 9 can be known through the monitoring of the hydraulic oil.
2. Normal operation
After the preparation work is finished, the electromagnet 3DT and the electromagnet 4DT of the second three-position four-way reversing valve 3 are not powered, the electromagnet 5DT and the electromagnet 6DT of the third three-position four-way reversing valve 10 are not powered, and the auxiliary system does not participate in normal work.
(1) Piston upward movement of hydraulic cylinder 9
The electromagnet 1DT of the first three-position four-way reversing valve 2 is powered on, the electromagnet 2DT is powered off, pressure oil is output from the port B of the first three-position four-way reversing valve 2 (P-B), the oil port 13 of the second leak preventer 8 enters the front cavity 23 of the second leak preventer 8 to push the piston 17 to move rightwards, meanwhile, the piston 17 of the second leak preventer 8 pushes hydraulic oil in the rear cavity 22 to enter from a rod cavity of the hydraulic cylinder 9, the piston of the hydraulic cylinder 9 moves upwards and finally reaches the bottom of the upper end, and the quantity of the hydraulic oil left in the rear cavity 22 of the second leak preventer 8 is measured by the displacement sensor 24 and displayed by the industrial personal computer. If the rod cavity of the hydraulic cylinder 9 and the connected pipeline leak oil, the change condition of the monitoring oil can be seen from the industrial personal computer, so that a monitoring program can be designed, and functions of micro leakage monitoring, oil leakage limit alarming, sudden oil leakage alarming and the like are realized; if a pipe explosion or cylinder explosion accident occurs, the piston 17 of the second leakage preventer 8 automatically closes the second leakage preventer 8 after the hydraulic oil in the rear cavity 22 of the second leakage preventer 8 leaks light, and the hydraulic oil is prevented from continuing to leak, so that the pump stopping and production stopping accident can be avoided. Simultaneously, hydraulic oil in a rodless cavity of the hydraulic cylinder 9 enters a rear cavity 22 of the first leak preventer 7 from an oil port 20 of a rear end cover of the first leak preventer 7, pushes the piston 17 to move leftwards, and hydraulic oil in a front cavity 23 of the first leak preventer 7 flows back to an oil tank (A-T) from an A port of the first three-position four-way reversing valve 2.
(2) Piston downward movement of hydraulic cylinder 9
The electromagnet 2DT of the first three-position four-way reversing valve 2 is powered on, the electromagnet 1DT is powered off, pressure oil is output from an opening A of the first three-position four-way reversing valve 2 (P-A), the front end cover oil port 13 of the first leak preventer 7 enters the front cavity 23 of the first leak preventer 7 to push the piston 17 to move rightwards, meanwhile, the piston 17 pushes hydraulic oil in the rear cavity 22 to enter the rodless cavity of the hydraulic cylinder 9, the piston of the hydraulic cylinder 9 moves to the bottom at the lower end and finally reaches the bottom, and the quantity of the hydraulic oil left in the rear cavity 22 of the first leak preventer 7 is measured by the displacement sensor 24 and displayed by the industrial personal computer. If the rodless cavity of the hydraulic cylinder 9 and the connected pipeline leak oil, the change condition of the monitoring oil can be seen from the industrial personal computer, so that a monitoring program can be designed, and the functions of micro leakage monitoring, oil leakage limit alarming, sudden oil leakage alarming and the like are realized; when a pipe explosion or cylinder explosion accident occurs, the piston 17 of the first leakage preventer 7 automatically closes the first leakage preventer 7 after the hydraulic oil in the rear cavity 22 of the first leakage preventer 7 leaks light, and the hydraulic oil is prevented from continuing to leak, so that the pump stopping and production stopping accident can be avoided. Meanwhile, hydraulic oil with a rod cavity of the hydraulic cylinder 9 enters a rear cavity 22 of the second leakage preventer 8 from an oil port 20 of a rear end cover of the second leakage preventer 8, the piston 17 is pushed to move leftwards, and the hydraulic oil in a front cavity 23 of the second leakage preventer 8 flows back to an oil tank (B-T) from a port B of the first three-position four-way reversing valve 2.
Claims (4)
1. A hydraulic leak-proof control device is characterized in that: the monitoring working part comprises a first three-position four-way reversing valve (2), a first leakage preventer (7) and a second leakage preventer (8), wherein two external ports of the first three-position four-way reversing valve (2) are respectively connected with hydraulic oil pipelines, two output ports of the first three-position four-way reversing valve (2) are respectively connected with oil inlets at two ends of a piston cylinder of a monitored hydraulic cylinder (9) through hydraulic oil pipelines, and the first leakage preventer (7) and the second leakage preventer (8) are respectively arranged in the hydraulic oil pipelines at two ends of the hydraulic cylinder (9); the first leakage preventer (7) and the second leakage preventer (8) respectively comprise a front end cover (26), a cylinder body (18), a piston (17), a rear end cover (21), a displacement sensor (24), an electronic bin (25), a magnetic ring (14) and a measuring rod (19), wherein the front end cover (26), the rear end cover (21) and the cylinder body (18) form a closed structure, the cylinder body (18) is internally provided with the piston (17) which moves axially, the front end cover (26) and the rear end cover (21) are respectively provided with an oil port, the electronic bin (25) is arranged on the outer side of the front end cover (26), the displacement sensor (24) is arranged in the front end cover (26), the displacement sensor (24) is connected with the electronic bin (25), the signal output end of the electronic bin (25) is connected with the signal input end of an industrial personal computer through a cable, the measuring rod (19) is arranged on the central axis of the cylinder body (18), the piston (17) is provided with a central hole which is in sliding fit with the measuring rod (19), the magnetic ring (14) is arranged on the piston (17), the magnetic ring (14) is opposite to the displacement sensor (24) in the axial direction, the oil ports of the front end cover (26) and the rear end cover (21) of the first leak preventer (7) and the second leak preventer (8) are respectively connected with a hydraulic pipeline leading to the monitored hydraulic cylinder (9).
2. The hydraulic leak-proof control apparatus according to claim 1, characterized in that: a first one-way valve (1) is arranged between an external connection port of the first three-position four-way reversing valve (2) and a hydraulic oil pipeline, and sealing structures are respectively arranged between the outer wall of the piston and the cylinder body (18) and between the central hole of the piston and the measuring rod (19).
3. The hydraulic leak-proof control apparatus according to claim 1, characterized in that: the hydraulic cylinder comprises an auxiliary part, wherein the auxiliary part comprises a second three-position four-way reversing valve (3), a third three-position four-way reversing valve (10), a first hydraulic valve (4), a second hydraulic valve (6), a second one-way valve (5), a third one-way valve (11) and a fourth one-way valve (12), and further comprises a first leak preventer (7) and a second leak preventer (8) of a monitoring working part, two external ports of the second three-position four-way reversing valve (3) of the auxiliary part are respectively connected with a hydraulic oil pipeline, one output port of the auxiliary part is connected with the reversing end of the second hydraulic valve (6) through a pipeline, meanwhile, the output port is connected with a rear end cover oil port (20) of the second leak preventer (8) and a rod cavity oil port of a hydraulic cylinder (9) through a fourth one-way valve (12), and the other output port of the second three-position four-way reversing valve (3) is connected with the reversing end of the first hydraulic valve (4) through a pipeline, and meanwhile, the output port is connected with a rear end cover (20) of the first leak preventer (7) and the rod-free oil port of the hydraulic cylinder through the second one-way valve (5).
4. The hydraulic leak-proof control apparatus according to claim 3, wherein: an external port of a third three-position four-way reversing valve (10) of the auxiliary part is connected with a hydraulic oil pipeline through a third one-way valve (11), an output port of the third three-position four-way reversing valve (10) is connected with a pipeline behind a fourth one-way valve (12) connected with an output port of the second three-position four-way reversing valve (3), and the other output port of the third three-position four-way reversing valve (10) is connected on a connecting pipeline between a rodless cavity of a hydraulic cylinder (9) and the first leakage preventer (7).
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| CN201810045389.XA CN108131353B (en) | 2018-01-17 | 2018-01-17 | Hydraulic leakage-proof control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109572034A (en) * | 2019-01-14 | 2019-04-05 | 苏州胜铭龙油压设备有限公司 | A kind of hydraulic press power device |
| CN110081044B (en) * | 2019-04-15 | 2024-02-02 | 宣化钢铁集团有限责任公司 | Hydraulic leak detection valve and online leak detection method |
| CN111473021A (en) * | 2020-04-10 | 2020-07-31 | 四川益巨交通工程有限责任公司 | Fluid leakage detection method and device |
| CN112727854B (en) * | 2020-12-25 | 2023-05-26 | 湖南中铁五新重工有限公司 | Oil injection device and hydraulic system are prevented to hydraulic pressure oil pipe explosion |
| CN114017421A (en) * | 2021-11-18 | 2022-02-08 | 中国长江电力股份有限公司 | System and method for monitoring oil leakage of speed regulator hydraulic system |
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