CN104089078A - Proportional control device used for linear-stroke valve - Google Patents
Proportional control device used for linear-stroke valve Download PDFInfo
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- CN104089078A CN104089078A CN201410339767.7A CN201410339767A CN104089078A CN 104089078 A CN104089078 A CN 104089078A CN 201410339767 A CN201410339767 A CN 201410339767A CN 104089078 A CN104089078 A CN 104089078A
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- 239000003921 oil Substances 0.000 claims abstract description 264
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 62
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 238000012423 maintenance Methods 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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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
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2846—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0008—Mechanical means
- F16K37/0016—Mechanical means having a graduated scale
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Check Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to proportional control devices used for linear-stroke valves, and provides a proportional control device used for a linear-stroke valve in order to solve the problems that when a servo valve is used for regulating the opening degree of a linear-stroke valve opening and closing piece, the cost is high and maintenance is uneasy or when a proportional reversing valve is used for regulating, the precision is not high enough and the cost is high. The proportional control device used for the linear-stroke valve comprises an oil supply system and a working oil path. The oil supply system comprises an oil tank and an oil pump, and the oil pump pumps hydraulic oil from the oil tank so as to provide working power for the device. A working system comprises two two-position three-way digital valve, one group of stacked double unidirectional valve hydraulic valves and a single-rod piston-type hydraulic cylinder, and the end, arranged outside a cylinder body, of a piston rod of the hydraulic cylinder is connected with an opening and closing piece of a valve with the opening degree of the opening and closing piece needing to be regulated. By means of the proportional control device used for the linear-stroke valve, the opening degree of the opening and closing piece can be regulated precisely, and the proportional control device is simple in operation, low in cost, good in stain resistance and easy to maintain.
Description
Technical Field
The invention relates to a proportional regulating device for valve flow, in particular to a proportional regulating device with a linear stroke of a valve opening and closing piece.
Background
The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. The valve opening and closing piece is used for controlling the circulation of a working medium in the valve, wherein the stroke of the opening and closing piece of the valve such as a gate valve, an angle valve and the like is a straight line in the opening and closing process.
Taking a gate valve as an example, the gate valve is a valve in which an opening and closing member moves in a direction perpendicular to a center line of a passage. The opening and closing part of the gate valve is a gate plate, the movement direction of the gate plate is vertical to the fluid direction, the fluid flow resistance is small, the torque required by opening and closing is small, the medium flow direction is not limited, no water hammer phenomenon exists during opening and closing, the body structure is simple, and the manufacturing process is good. The aperture size can be adjusted to the flashboard of gate valve to play the flow size of circulation in the restriction gate valve, but the gate valve of big latus rectum is usually bulky, only relies on the unable regulation of accomplishing the flashboard aperture of manpower, and because installation space limits, the aperture of the unable manpower of use or stage property gate valve flashboard of most installed in the use is adjusted.
When the flow is controlled by proportionally regulating the gate valve, a three-position four-way proportional reversing valve or a servo valve is usually used for carrying out fixed-value regulation on the opening and closing degree of the gate valve flashboard, and the result is accurate. However, the proportional reversing valve has a zero dead zone phenomenon, so that the condition of low response speed can occur when the proportional reversing valve is used, and the valve port opening of the proportional reversing valve is large, so that the precision is not high when the proportional reversing valve is used for adjustment.
The zero position of the servo valve is basically uncovered, so when the servo valve is used for adjusting the opening degree of the gate valve gate plate, the response speed is high, but the rated opening amount of the servo valve is generally smaller than 0.5mm (millimeter), so that when the opening degree of the gate plate of the large gate valve is adjusted, the servo valve with larger flow needs to be adopted, the realization cost is increased, and the servo valve has high precision and complex production process, so that the maintenance difficulty is higher.
Meanwhile, the proportional reversing valve or the servo valve is a high-precision valve, has high requirements on the cleanness degree of a working medium, has poor pollution resistance and has high requirements on the environment of a use occasion.
Disclosure of Invention
The invention provides a proportional adjusting device for a linear stroke valve, which aims to solve the problems of high cost and difficult maintenance caused by using a servo valve to adjust the opening degree of a valve opening and closing piece with a linear stroke, or insufficient precision and high cost caused by using a proportional reversing valve to adjust the opening degree of the valve opening and closing piece with the linear stroke; the working oil circuit comprises two-position three-way digital valves, a group of superposed double one-way valve hydraulic control valves and a single-rod piston type hydraulic cylinder, wherein a piston rod of the hydraulic cylinder is arranged at one end outside the cylinder body and is connected with a starting and closing part of a valve of which the opening degree of the starting and closing part needs to be adjusted; wherein,
the first digital valve is used for introducing hydraulic oil into a rodless cavity of the hydraulic cylinder, an oil inlet cavity of the first digital valve is communicated with the oil tank through the oil pump, a working oil cavity is communicated with an oil inlet of a first one-way valve in the stacked double one-way valve hydraulic control valve through a connecting pipeline, a branch pipeline is arranged on the connecting pipeline and is connected with a control oil port of a second one-way valve in the stacked double one-way valve hydraulic control valve, the control oil port is used for enabling a part of hydraulic oil flowing out of a working oil cavity of the first digital valve to flow into the second one-way valve, and an oil outlet of the first one-way valve is connected with the rodless cavity of the hydraulic cylinder;
the second digital valve is used for introducing hydraulic oil into a rod cavity of the hydraulic cylinder, an oil inlet cavity of the second digital valve is communicated with the oil tank through the oil pump, a working oil cavity is communicated with an oil inlet of the second one-way valve in the stacked double one-way valve hydraulic control valve through a connecting pipeline, a branch pipeline is arranged on the connecting pipeline and is connected with a control oil port of the first one-way valve, the control oil port is used for enabling a part of hydraulic oil flowing out of the working oil cavity of the second digital valve to flow into the first one-way valve, and an oil outlet of the second one-way valve is connected with the rod cavity of the hydraulic cylinder.
When the proportional control device for the linear stroke valve is not started, a piston rod of the hydraulic cylinder keeps the original position.
When the first digital valve communicated with the rodless cavity of the hydraulic cylinder is electrified, the first digital valve is reversed, the oil pump pumps hydraulic oil out of the oil tank, and the hydraulic oil is introduced into the rodless cavity of the hydraulic cylinder through the first digital valve and the first one-way valve in the overlapped double one-way valve hydraulic control valve, so that the piston rod of the hydraulic cylinder extends out of the hydraulic cylinder, and a switching piece of a valve, the opening of which needs to be adjusted, is pushed towards the direction of a liquid flow channel; meanwhile, a part of the hydraulic oil flowing out of the communicated first digital valve flows into a control oil port of a second one-way valve through a branch pipe of a connecting pipeline between the first digital valve and the first one-way valve, enters the second one-way valve and jacks a valve core of the second one-way valve, and the second one-way valve is opened, so that the hydraulic oil in a rodless cavity of the hydraulic cylinder pushes a piston to discharge the hydraulic oil in a rod cavity after the hydraulic oil is introduced into the rodless cavity of the hydraulic cylinder, flows out of the second one-way valve and flows back to the oil tank through the second digital valve of the device, the aim of reducing the opening degree of the valve opening and closing piece with the linear stroke is fulfilled, and the flow of a working medium flowing out of the valve is reduced.
When the second digital valve communicated with the rod cavity of the hydraulic cylinder is electrified, the second digital valve is reversed, the oil pump pumps hydraulic oil out of the oil tank, and the hydraulic oil is introduced into the rod cavity of the hydraulic cylinder through the second digital valve and a second one-way valve in the superposed double one-way valve hydraulic control valve, so that a piston rod of the hydraulic cylinder retracts into the hydraulic cylinder, and a starting and closing piece of a valve, the opening of which needs to be adjusted, is dragged to the moving direction of the piston rod; meanwhile, a part of the hydraulic oil flowing out of the communicated second digital valve flows into a control oil port of a first check valve through a branch pipe of a connecting pipeline between the second digital valve and the second check valve, enters the first digital valve and jacks a valve core of the first check valve, and the first digital valve is opened, so that hydraulic oil in a rodless cavity, which is discharged by pushing a piston after the hydraulic oil is introduced into a rod cavity of the hydraulic cylinder, flows out of the first check valve and flows back to the oil tank through the first digital valve in the device, the purpose of increasing the opening degree of the valve opening and closing piece with a linear stroke is achieved, and the flow of the working medium flowing out of the valve is increased.
The proportional regulating device for the linear stroke valve can regulate the extending length of the piston rod of the hydraulic cylinder by controlling the amount of hydraulic oil introduced into the hydraulic cylinder according to actual needs, so that the opening degree of the valve opening and closing piece with the linear stroke can be regulated, and the flow of a working medium passing through the valve can be regulated.
Preferably, the proportional control device for the linear stroke valve further comprises a protection oil path, wherein the protection oil path comprises a two-position three-way reversing valve and an oil inlet hydraulic control one-way valve, an oil inlet cavity of the two-position three-way reversing valve is communicated with the oil tank through the oil pump, a working oil cavity is communicated with a control oil path of the oil inlet hydraulic control one-way valve, and the other working oil cavity is communicated with the oil tank; an oil inlet of the oil inlet hydraulic control one-way valve is communicated with the rodless cavity of the hydraulic cylinder, and an oil outlet of the oil inlet hydraulic control one-way valve is communicated with the oil tank. When the working oil path of the proportional adjusting device for the linear stroke valve breaks down, the two-position three-way reversing valve is opened, hydraulic oil enters the two-position three-way reversing valve through the oil pump and enters from the control oil port of the oil inlet hydraulic control one-way valve, the valve core of the oil inlet hydraulic control one-way valve is jacked open, so that the hydraulic oil in the oil tank can directly enter the rodless cavity of the hydraulic cylinder through the oil pump, a pipeline connected to the rod cavity of the hydraulic cylinder is connected with the oil tank by a worker, a piston rod of the hydraulic cylinder extends out, the opening and closing piece of the valve is pushed to the bottom of the liquid flow channel, the valve is closed, and then the working oil path of the proportional adjusting device for the linear stroke valve is detected and maintained. Under the condition that the working oil circuit has problems, the protective oil circuit can rapidly close the valve, thereby avoiding the influence on subsequent working elements caused by overlarge flow of the working medium in the liquid flow channel of the valve and ensuring the normal operation of the whole system.
Furthermore, the protection oil circuit is also provided with an oil discharge hydraulic control one-way valve, a control oil port of the oil discharge hydraulic control one-way valve is communicated with a working oil cavity of a control oil port of the oil inlet hydraulic control one-way valve connected with the two-position three-way reversing valve, an oil outlet of the oil discharge hydraulic control one-way valve is communicated with a rod cavity of the hydraulic cylinder, and an oil inlet is communicated with the oil tank. When the working oil way of the proportional control device for the linear stroke valve breaks down, the hydraulic oil flowing out of the working oil cavity of the two-position three-way reversing valve not only opens the valve core of the oil inlet one-way valve, but also opens the valve core of the oil discharge hydraulic control one-way valve, so that the hydraulic oil in the rod cavity of the hydraulic cylinder can enter the oil tank through the oil discharge hydraulic control one-way valve, and the pipeline on the rod cavity of the hydraulic cylinder is not required to be manually connected to the oil tank. When the opening and closing piece of the linear travel valve needs to be adjusted from a larger opening to a smaller opening, the working oil way can be closed first, the protection oil way is opened, then the protection oil way is used for filling hydraulic oil into the rodless cavity of the hydraulic cylinder, the opening and closing piece of the linear travel valve is closed rapidly, then the protection oil way is closed, the working oil way is opened, the second digital valve is electrified, the hydraulic oil is filled into the rod cavity of the hydraulic cylinder through the second digital valve and the second one-way valve, the piston rod of the hydraulic cylinder returns into the hydraulic cylinder, the opening and closing piece of the linear travel valve is opened gradually, the time consumed when the opening and closing piece of the valve is adjusted from the larger opening to the smaller opening is shortened, the adjusting efficiency is increased, and the condition that a larger flow of working medium flowing out of the linear travel valve generates impact on subsequent working elements when the working oil way is adjusted slowly can not occur, the normal use of the subsequent elements is guaranteed.
Preferably, a piston rod of the hydraulic cylinder is provided with a scale value with a division value of 0.5 mm. The length of the piston rod which extends out or retracts can be accurately obtained by recording the scale value of the initial position of the piston rod during movement and the scale value after the piston rod finally stops, then the whole length of the valve opening and closing piece with the straight stroke is compared, namely the opening degree of the valve opening and closing piece with the straight stroke can be calculated, and therefore the adjusting degree of the valve opening and closing piece with the straight stroke can be visually reflected.
Preferably, an oil suction filter is arranged on the oil tank, and hydraulic oil enters the oil pump through the oil suction filter. The oil suction filter is used for filtering hydraulic oil sucked out of the oil tank, so that stable operation of the proportional adjusting device for the linear stroke valve is guaranteed, and maintenance frequency of the proportional adjusting device for the linear stroke valve is reduced.
Preferably, the oil tank is provided with a return oil filter through which the hydraulic oil returned to the oil tank flows into the oil tank. The return oil filter is used for filtering the hydraulic oil which flows back to the oil tank, so that the cleanness degree of the hydraulic oil in the oil tank is ensured, the stable operation of the proportional adjusting device for the linear stroke valve is ensured, and the maintenance frequency of the proportional adjusting device for the linear stroke valve is reduced.
The proportional regulating device for the linear stroke valve solves the problems of high cost, inconvenient maintenance and the like caused by regulating the opening of the opening and closing part of the valve by using a proportional reversing valve or a servo valve, and increases a protection oil way under the condition of ensuring the regulating precision, so that the safety of the whole working system is greatly improved.
Drawings
Fig. 1 is a schematic view of a proportional control device for a linear travel valve according to the present invention.
Detailed Description
As shown in fig. 1, the proportional control device for a linear stroke valve of the present invention includes an oil supply system 1, a working oil path 2, and a protection oil path 3, where the oil supply system 1 includes an oil tank 11, an oil pump 12, an oil suction filter 13, and an oil return filter 14, and the oil pump 12 draws hydraulic oil from the oil tank 11, and after filtering the hydraulic oil through the oil suction filter 13, provides working power to the proportional control device for a linear stroke valve.
The working oil circuit 2 comprises two-position three-way digital valves, namely a first digital valve 21, a second digital valve 22, a group of superposed double one-way valve hydraulic control valves 23 and a single-rod piston type hydraulic cylinder 24, one end of a piston rod 243 of the hydraulic cylinder 24, which is arranged outside the cylinder body, is connected with a switching piece of a valve, the opening degree of which needs to be adjusted, and the piston rod 243 is provided with a scale value with the precision of 0.5 mm. The superposition type double one-way valve hydraulic control valve 23 consists of two hydraulic control one-way valves, namely a first one-way valve 231 and a second one-way valve 232, when in connection, a branch pipe is arranged on a connecting pipeline at an oil inlet of the first one-way valve 231, and the branch pipe is connected with a control oil port of the second one-way valve 232 and used for opening a valve core of the second one-way valve 232 so that hydraulic oil can flow in from an oil outlet of the second one-way valve 232 and flow out from an oil inlet; meanwhile, a branch pipe is provided on the connection pipe at the oil inlet of the second check valve 232, and the branch pipe is connected to the control oil port of the first check valve 231 to open the valve element of the first check valve 231, so that the hydraulic oil can flow in from the oil outlet of the first check valve 231 and flow out from the oil inlet.
The first digital valve 21 is used for introducing hydraulic oil into a rodless cavity 241 of the hydraulic cylinder, an oil inlet cavity of the first digital valve 21 is communicated with the oil tank 11 through the oil pump 12 and the oil suction filter 13, a working oil cavity is communicated with a connecting pipeline at an oil inlet of the first one-way valve 231, an oil outlet of the first one-way valve 231 is connected with the rodless cavity 241 of the hydraulic cylinder 24, meanwhile, a part of the hydraulic oil flowing from the first digital valve 21 to the first one-way valve 231 flows to a control oil port of a second one-way valve 232 in the superposed type double one-way valve hydraulic control valve 23 through a branch pipe arranged on the connecting pipeline at the oil inlet of the first one-way valve 231, and enters the second one-way valve 232 and pushes a valve core of the second one-way valve 232 open, so that the second one-way valve 232 is opened;
the second digital valve 22 is used for introducing hydraulic oil into the rod cavity 242 of the hydraulic cylinder 24, the oil inlet cavity of the second digital valve 22 is communicated with the oil tank 11 through the oil pump 12 and the oil suction oil filter 13, a working oil cavity is communicated with a connecting pipeline at the oil inlet of the second one-way valve 232, the oil outlet of the second one-way valve 232 is connected with the rod cavity 242 of the hydraulic cylinder 24, meanwhile, a part of the hydraulic oil flowing from the second digital valve 22 to the second one-way valve 232 flows to the control oil port of the first one-way valve 231 in the overlapped double one-way valve 23 through a branch pipe arranged on the connecting pipeline at the oil inlet of the second one-way valve 232, enters the second one-way valve 232 and pushes the valve core of the first one-way valve 231 open, so that the first one-way valve 231 is opened;
the protection oil path 3 comprises a two-position three-way reversing valve 31, an oil inlet hydraulic control one-way valve 32 and an oil outlet hydraulic control one-way valve 33, wherein an oil inlet cavity of the two-position three-way reversing valve 31 is communicated with the oil tank 11 through the oil pump 12 and the oil suction oil filter 13, a working oil cavity is communicated with a control oil port of the oil inlet hydraulic control one-way valve 32 and a control oil port of the oil outlet hydraulic control one-way valve 33 through a connecting pipeline, and the other working oil cavity is communicated with the oil tank 11 through the oil return oil filter; an oil inlet of the oil inlet hydraulic control one-way valve 32 is communicated with a rodless cavity 241 of the hydraulic cylinder 24, and an oil outlet is communicated with the oil tank 11 through the oil pump 12 and the oil suction filter 13; the outlet of the drain pilot operated check valve 33 communicates with the rod chamber 242 of the hydraulic cylinder 24, and the inlet communicates with the oil tank 11 through the return oil filter 14.
When the proportional control device for the linear stroke valve is not activated, the piston rod 243 of the hydraulic cylinder 24 keeps the home position.
When the first digital valve 21 communicated with the rodless cavity 241 of the hydraulic cylinder 24 is electrified, the first digital valve 21 is reversed, the oil pump 12 pumps hydraulic oil out of the oil tank 11 through the filtering of the oil suction filter 13, the hydraulic oil is introduced into the rodless cavity 241 of the hydraulic cylinder 24 through the first digital valve 21 and the first check valve 231, so that the piston rod 243 of the hydraulic cylinder 24 extends out of the hydraulic cylinder, and the opening and closing element of the valve needing to adjust the opening degree of the opening and closing element is pushed towards the direction of a liquid flow channel; meanwhile, a part of the hydraulic oil flowing out of the digital valve 21 flows into the second check valve 232 through a branch pipe arranged on a connecting pipeline at the oil inlet of the first check valve 231 from a control oil port of the second check valve 232, the valve core of the second check valve 232 is jacked open, so that the hydraulic oil in the rod cavity 242 of the hydraulic cylinder 24 flows out of the rod cavity 242 under the action of thrust generated by the hydraulic oil introduced into the rodless cavity 241, the oil outlet of the second check valve 232 jacked open by the valve core flows to the oil inlet, and flows into the oil tank 11 through the second digital valve 22 and the oil return filter 14, thereby achieving the purpose of reducing the opening degree of the valve opening and closing member with a linear stroke, and reducing the flow rate of the working medium flowing out of the valve.
When the second digital valve 22 communicated with the rod cavity 242 of the hydraulic cylinder 24 is electrified, the second digital valve 22 is reversed, the oil pump 12 pumps hydraulic oil out of the oil tank 11 through the filtering of the oil suction filter 13, the hydraulic oil is introduced into the rod cavity 242 of the hydraulic cylinder 24 through the second digital valve 22 and the second one-way valve 232, so that the piston rod 243 of the hydraulic cylinder 24 retracts into the rod cavity 242 of the hydraulic cylinder 24, and the opening and closing member of the valve needing to adjust the opening degree of the opening and closing member is dragged towards the moving direction of the piston rod 243; meanwhile, a part of the hydraulic oil flowing out of the second digital valve 22 flows into the second check valve 232 from the control oil port of the first check valve 231 through a branch pipe arranged on a connecting pipeline at the oil inlet of the second check valve 232, the valve core of the first check valve 231 is jacked open, so that the hydraulic oil in the rodless cavity 241 of the hydraulic cylinder 24 flows out of the rodless cavity 241 under the action of thrust generated by the hydraulic oil introduced into the rod cavity 242, and the oil outlet of the first check valve 231, which is jacked open by the valve core, flows to the oil inlet and flows into the oil tank 11 through the first digital valve 21 and the return oil filter 14, so that the purpose of increasing the opening degree of the valve opening and closing member with a linear stroke is achieved, and the flow rate of the working medium flowing out of the valve is increased.
When the working oil path 2 of the proportional control device for the linear stroke valve has a fault, the two-position three-way reversing valve 31 is opened, hydraulic oil is filtered by the oil suction oil filter 13 and enters the two-position three-way reversing valve 31 through the oil pump 12, and the hydraulic oil enters the oil inlet hydraulic control one-way valve 32 and the oil discharge hydraulic control one-way valve 33 through a working oil cavity of the two-position three-way reversing valve 31 through the control oil ports of the oil inlet hydraulic control one-way valve 32 and the oil discharge hydraulic control one-way valve 33 respectively, so that the valve core of the oil inlet hydraulic control one-way valve 32 and the valve core of the. Because the valve core of the oil inlet hydraulic control one-way valve 32 is pushed open, hydraulic oil in the oil tank 11 can flow into the rodless cavity 241 of the hydraulic cylinder 24 through the oil pump 12 after being filtered by the oil suction oil filter 13 and the oil inlet hydraulic control one-way valve 32 with the valve core pushed open, thrust is generated on the piston of the hydraulic cylinder 24 due to the hydraulic oil filled in the rodless cavity 241, so that the hydraulic oil in the rod cavity 242 of the hydraulic cylinder 24 can pass through the oil outlet hydraulic control one-way valve 33 with the valve core pushed open, and finally enters the oil tank 11 after being filtered by the oil return filter 14, the piston rod 243 of the hydraulic cylinder 24 extends out, the opening and closing piece of the valve is pushed to the bottom of the liquid flow channel, so that the valve is closed, and then the working oil path of the proportional adjusting device for the linear.
Since the flow rate of the digital valve is small, when the opening of the valve opening/closing member is adjusted by using the digital valve, the adjustment process takes a long time, and when the opening/closing member of the linear stroke valve needs to be adjusted from a large opening to a small opening, if the linear stroke valve opening/closing member is adjusted by filling hydraulic oil into the rodless cavity 241 of the hydraulic cylinder 24 only by the first digital valve 21, a long-time consuming situation occurs, the process is slow, and even impact may be generated on subsequent working elements. Therefore, when the opening and closing member of the linear stroke valve needs to be adjusted from a larger opening to a smaller opening, the working oil path 2 is closed, the hydraulic oil is filled into the rodless cavity 241 of the hydraulic cylinder 24 by using the protection oil path 3, the piston rod 243 is extended, the opening and closing member of the linear stroke valve is quickly closed, the protection oil path 3 is closed, the working oil path 2 is opened, the second digital valve 22 is electrified, the hydraulic oil enters the rod cavity 242 of the hydraulic cylinder 24 through the second digital valve 22 and the second one-way valve 232, the opening of the linear stroke valve opening and closing member is adjusted from 0, the time consumed when the valve opening and closing member is adjusted from the larger opening to the smaller opening is saved, the adjustment efficiency is increased, and because the opening of the valve opening and closing member is slowly increased from 0, the flow rate of the working medium passing through the linear stroke valve is gradually increased to a set value, the use safety of the subsequent elements is protected.
The proportional regulating device for the linear stroke valve can regulate the extending length of the piston rod 243 of the hydraulic cylinder 24 by controlling the amount of hydraulic oil introduced into the hydraulic cylinder 24 according to actual needs, the extending length of the piston rod 243 can be intuitively read from the scale value on the piston rod 243, and then the whole length of a valve opening and closing piece with a linear stroke is compared, so that the opening degree of the valve opening and closing piece with the linear stroke can be known, the aim of regulating the opening degree of the valve opening and closing piece with the linear stroke is fulfilled, the aim of regulating the flow of a working medium passing through the valve can be fulfilled, the device is simple to operate and low in cost, and the digital valve and the superposed double-one-way valve hydraulic control valve are simple in structure and good in pollution resistance, so that the proportional regulating device is easy to maintain. And the proportion adjusting device for the linear stroke valve is provided with the protection oil way, so that the valve can be quickly closed by the protection oil way under the condition that the working oil way has problems, the influence on subsequent working elements caused by overlarge flow of a working medium in a valve liquid flow channel is avoided, and the normal operation of the whole system is ensured.
Claims (6)
1. A proportion regulating device for a linear stroke valve comprises an oil supply system and a working oil way, wherein the oil supply system comprises an oil tank and an oil pump, and the oil pump draws hydraulic oil from the oil tank so as to provide working power for the device; the working oil circuit comprises two-position three-way digital valves, a group of superposed double one-way valve hydraulic control valves and a single-rod piston type hydraulic cylinder, wherein a piston rod of the hydraulic cylinder is arranged at one end outside the cylinder body and is connected with a starting and closing part of a valve of which the opening degree of the starting and closing part needs to be adjusted; wherein,
the first digital valve is used for introducing hydraulic oil into a rodless cavity of the hydraulic cylinder, an oil inlet cavity of the first digital valve is communicated with the oil tank through the oil pump, a working oil cavity is communicated with an oil inlet of a first one-way valve in the stacked double one-way valve hydraulic control valve through a connecting pipeline, a branch pipeline is arranged on the connecting pipeline and is connected with a control oil port of a second one-way valve in the stacked double one-way valve hydraulic control valve, the control oil port is used for enabling a part of hydraulic oil flowing out of a working oil cavity of the first digital valve to flow into the second one-way valve, and an oil outlet of the first one-way valve is connected with the rodless cavity of the hydraulic cylinder;
the second digital valve is used for introducing hydraulic oil into a rod cavity of the hydraulic cylinder, an oil inlet cavity of the second digital valve is communicated with the oil tank through the oil pump, a working oil cavity is communicated with an oil inlet of the second one-way valve in the stacked double one-way valve hydraulic control valve through a connecting pipeline, a branch pipeline is arranged on the connecting pipeline and is connected with a control oil port of the first one-way valve, the control oil port is used for enabling a part of hydraulic oil flowing out of the working oil cavity of the second digital valve to flow into the first one-way valve, and an oil outlet of the second one-way valve is connected with the rod cavity of the hydraulic cylinder.
2. The proportional control device for a linear stroke valve as claimed in claim 1, further comprising a protection oil path, wherein the protection oil path comprises a two-position three-way directional valve and a hydraulic-controlled inlet check valve, an oil inlet chamber of the two-position three-way directional valve is communicated with the oil tank through an oil pump, a working oil chamber is communicated with a control oil port of the hydraulic-controlled inlet check valve through a connecting pipeline, and another working oil chamber is communicated with the oil tank; an oil inlet of the hydraulic control one-way valve is communicated with a rodless cavity of the hydraulic cylinder through a connecting pipeline, and an oil outlet of the hydraulic control one-way valve is communicated with the oil tank through an oil pump.
3. The proportional control device for a linear stroke valve as claimed in claim 2, wherein the protection oil path is further provided with an oil discharge pilot-controlled check valve, a control oil port of the oil discharge pilot-controlled check valve is communicated with the working oil chamber of the control oil path of the oil inlet pilot-controlled check valve through a connecting pipeline, an oil outlet of the oil discharge pilot-controlled check valve is communicated with the rod chamber of the hydraulic cylinder, and an oil inlet is communicated with the oil tank.
4. Proportional regulating device for a linear stroke valve according to claim 1, characterized in that the piston rod of the hydraulic cylinder is provided with a scale value with a division value of 0.5 mm.
5. The proportioning device for a linear travel valve of claim 1 wherein an oil suction filter is provided on the oil tank through which hydraulic oil enters the oil pump.
6. Proportional regulating device for a linear stroke valve according to claim 1, characterized in that a return oil filter is arranged on the tank, through which return oil filter the hydraulic oil returning to the tank flows into the tank.
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| CN201410339767.7A CN104089078B (en) | 2014-07-16 | 2014-07-16 | For the proportion adjustment device of linear rows stroke valve |
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| CN201410339767.7A CN104089078B (en) | 2014-07-16 | 2014-07-16 | For the proportion adjustment device of linear rows stroke valve |
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| CN105156393A (en) * | 2015-09-30 | 2015-12-16 | 中国船舶重工集团公司第七一九研究所 | Low-noise integrated pneumatic valve |
| CN106402059A (en) * | 2016-12-26 | 2017-02-15 | 徐工集团工程机械有限公司 | Load port individual valve, hydraulic bus control system and engineering machinery |
| CN107605843A (en) * | 2017-10-12 | 2018-01-19 | 徐州徐工随车起重机有限公司 | A kind of electro-hydraulic leveling valve group of multifunctional working bucket |
| CN107795535A (en) * | 2017-11-28 | 2018-03-13 | 湖南星邦重工有限公司 | A kind of scissor aerial work platform and its floating hydraulic control system |
| CN107795532A (en) * | 2017-11-28 | 2018-03-13 | 湖南星邦重工有限公司 | A kind of scissor aerial work platform and its floating hydraulic control system |
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| CN109404352A (en) * | 2018-12-17 | 2019-03-01 | 沈阳理工大学 | A kind of passive type automatic resisting applying mechanism and method |
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| CN110864019A (en) * | 2019-11-28 | 2020-03-06 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
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| CN114294556A (en) * | 2021-12-27 | 2022-04-08 | 上海华建开关有限公司 | Gas circulation protection low-voltage switch cabinet |
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| CN106402059A (en) * | 2016-12-26 | 2017-02-15 | 徐工集团工程机械有限公司 | Load port individual valve, hydraulic bus control system and engineering machinery |
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| CN107830001A (en) * | 2017-11-28 | 2018-03-23 | 湖南星邦重工有限公司 | A kind of scissor aerial work platform and its hydraulic system |
| CN109404352A (en) * | 2018-12-17 | 2019-03-01 | 沈阳理工大学 | A kind of passive type automatic resisting applying mechanism and method |
| CN109404352B (en) * | 2018-12-17 | 2024-01-30 | 沈阳理工大学 | Passive automatic resistance applying mechanism and method |
| CN109538780A (en) * | 2019-01-11 | 2019-03-29 | 西安建筑科技大学 | A kind of the adjusting shrinkage cavity device and its application method of hydraulic-driven |
| CN110864019A (en) * | 2019-11-28 | 2020-03-06 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| CN112283961A (en) * | 2020-11-11 | 2021-01-29 | 上海电气液压气动有限公司 | Double-pump joint control solar photo-thermal tracking device |
| CN112283961B (en) * | 2020-11-11 | 2022-06-21 | 上海电气液压气动有限公司 | Double-pump joint control solar photo-thermal tracking device |
| CN114294556A (en) * | 2021-12-27 | 2022-04-08 | 上海华建开关有限公司 | Gas circulation protection low-voltage switch cabinet |
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