CN113606211B - Digital valve bank integrated unit configuration and control method - Google Patents
Digital valve bank integrated unit configuration and control method Download PDFInfo
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- CN113606211B CN113606211B CN202110883272.0A CN202110883272A CN113606211B CN 113606211 B CN113606211 B CN 113606211B CN 202110883272 A CN202110883272 A CN 202110883272A CN 113606211 B CN113606211 B CN 113606211B
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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
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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
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
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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
- 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
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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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
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6656—Closed loop control, i.e. control using feedback
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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)
- Flow Control (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a digital valve group integrated unit configuration and a control method, which comprises a bottom plate valve block, a plurality of switch valves, a coil and a measurement and control assembly, wherein four digital flow control unit valve blocks are uniformly distributed above the bottom plate valve block, 4 groups of two layers of oil ducts respectively corresponding to the digital flow control unit valve blocks are arranged in the bottom plate valve block, the two layers of oil ducts are communicated through a plurality of branches, and the upper side of the digital flow control unit valve block is provided with a plurality of switch valves which are distributed at equal intervals and control the branches. According to the invention, the small-flow electromagnetic switch valves are connected in parallel, and different numbers of switch valves are combined to obtain a configuration mode of any coding, so that discrete output of stepped flow is realized. The invention can adopt a closed-loop control method of PCM, PWM and combination thereof, approximately realizes continuous control through digital switch combination, ensures high-precision control, and has the advantages of simple control, fast operation, high output precision and wide application range.
Description
Technical Field
The invention relates to the technical field of hydraulic switch control, in particular to a configuration and a control method of a digital valve set integrated unit.
Background
The small-flow electromagnetic switch valve is used as a key element of the electro-hydraulic digital control technology, has the advantages of simple structure, low cost, high response, low pressure loss, strong anti-pollution capability, high reliability and the like, is gradually and widely applied to the technical field of electro-hydraulic digital control, is independently controlled by a digital signal, is easy to be fused with a micro-sensing technology and a modern communication technology, and can realize the editable control and interactive connection of elements and systems and the real-time acquisition and processing of the working conditions of the systems. But its small flow characteristic cannot meet the requirement of driving a large load.
The flow output characteristic of the digital flow control unit depends on the combination and control mode of the small-flow electromagnetic switch valve, and the output characteristic of the digital flow control unit mainly refers to the error between the actual output and the ideal output. The conventional switch valve only has two states of 'on' and 'off', so the flow resolution is low, and the conventional switch valve is not suitable for occasions with high requirements on the flow resolution and the precision. The traditional control mode has the problems of discontinuous flow output, large calculated amount, overlarge flow step length, single control mode and the like for the output of a digital flow control unit, limits the output precision of the digital flow control unit, influences the application of a digital valve bank in a hydraulic system, and is a problem which needs to be solved by technical personnel in the field urgently.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a digital valve set integrated unit configuration and a control method which are simple to control, high in response speed, high in output precision and wide in application range.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a digital valve group integrated unit structure comprises a bottom plate valve block, a plurality of switch valves, coils and a measurement and control assembly, wherein four digital flow control unit valve blocks are uniformly distributed above the bottom plate valve block, 4 groups of two layers of oil ducts respectively corresponding to the digital flow control unit valve blocks are arranged in the bottom plate valve block, the two layers of oil ducts are communicated through a plurality of branches, a plurality of switch valves which are distributed at equal intervals and used for controlling the branches are arranged on the upper side of the digital flow control unit valve block, the oil inlet end of one oil duct of the two layers of oil ducts is communicated with the oil inlet of the bottom plate valve block, the other end of the oil duct of the two layers of oil ducts is sealed, one end of the other layer of oil duct is used for being connected with a cylinder connecting port or an oil tank port and connected with a flow sensor, and the other end of the other layer of oil duct is connected with the oil inlet end of the other group of oil duct, the coils are also arranged above the switch valves, and the measurement and control assembly is connected with the pressure sensors, the flow sensors and the coils;
the upper surface of the digital flow control unit valve block, the front surface and the rear surface of the digital flow control unit valve block corresponding to the outer side of the bottom plate valve block are in threaded connection with a plurality of pressure sensors which are distributed at equal intervals;
observe and control the subassembly and include controller, collection card, host computer, adjustable DC power supply, current sensor and relay, adjustable DC power supply with the normal start port of relay is connected, the output of controller with the triggering port of relay is connected, the other end of relay with the coil with current sensor connects, the input of collection card respectively with pressure sensor flow sensor with current sensor's output is connected, the output of collection card with the input of controller is connected, the controller pass through the cable with the host computer is connected.
The control method of the configuration of the digital valve group integrated unit comprises the following steps:
the first step,
Selecting a control configuration according with the requirements of a user, grouping a plurality of switching valves in the digital flow control unit valve block to obtain combinations of different numbers of switching valves, and forming a required coding configuration form;
step two,
According to the flow demand of a user, the on-off state of each on-off valve in the digital flow control unit valve block is calculated in real time through a flow equation, corresponding on-off signals are output through a controller, and the corresponding on-off valves are driven to make corresponding actions by combining the control modes of PCM, PWM and the combination of the PCM and PWM;
step three,
The controller controls the acquisition card to acquire a flow signal sent by the flow sensor, compares the flow signal with the flow demand of a user, and further adjusts the flow signal to realize closed-loop control until the flow demand of the user is met.
The technical scheme of the invention is further improved as follows: an upper oil duct and a lower oil duct are arranged in the bottom plate valve block; the upper oil duct and the lower oil duct on the rear side of the bottom plate valve block correspond to the digital flow control unit valve block arranged on the rear side above the bottom plate valve block, the upper oil duct and the lower oil duct on the front side of the bottom plate valve block correspond to the digital flow control unit valve block arranged on the front side above the bottom plate valve block, and a plurality of switching valves which are distributed at equal intervals are arranged on the upper side of the digital flow control unit valve block to control whether the upper oil duct and the lower oil duct corresponding to each digital flow control unit valve block are communicated or not;
the oil pipe comprises a front side and a rear side, and is characterized in that the left and right sides of an upper oil passage on the front side and a lower oil passage on the rear side are provided with normally closed oil outlets plugged by plugs, the left and right sides of the lower oil passage on the front side are respectively provided with a cylinder B port and a cylinder A port, the left and right sides of the upper oil passage on the rear side are provided with T oil tank ports, and the front side of a bottom plate valve block is provided with an oil inlet communicated with the upper oil passage.
The technical scheme of the invention is further improved as follows: the periphery of the switch valve is provided with an end cover embedded on the upper surface of the digital flow control unit valve block, and the switch valve and the end cover are fastened through a pressing plate on the upper side of the digital flow control unit valve block.
The technical scheme of the invention is further improved as follows: and the upper surface of the pressure plate is provided with a set screw positioned between two sides and two adjacent switch valves.
The technical scheme of the invention is further improved as follows: and the outer sides of the cylinder receiving port B, the cylinder receiving port A and the oil tank T are connected with a flow sensor through oil pipes.
The technical scheme of the invention is further improved as follows: the switch valve is a normally closed switch valve with a two-position two-way structure.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the invention can directly convert signals of the switches 0 and 1 into discrete flow, can realize digital control without A/D and D/A conversion control, and has simple control; by combining a closed-loop control method of PCM, PWM and combination thereof, continuous control is approximately realized through digital switch combination, and high-precision control is ensured;
2. according to the invention, through the combination of the plurality of switch valves, when the switch valve on one digital flow control unit valve block breaks down, the switch valve on the digital flow control unit valve block can be conveniently replaced, so that the maintenance is convenient, and the maintenance cost of the system is reduced;
3. according to the invention, through the combination of a plurality of switch valves, the control response of output can be improved, and the system performance is improved;
4. the invention obtains different coding configuration forms by grouping the switch valves, and can meet and adapt to the requirements of different working conditions;
5. the invention can improve the flow output range by increasing the number of the digital valves, can realize the control of a single flow control unit and a digital valve group integrated unit, not only increases the redundancy of the system and greatly improves the reliability of the system, but also can keep the original frequency characteristic, and can replace a proportional valve or a servo valve to realize the closed-loop high-precision control of the flow.
Drawings
Fig. 1 is a schematic view of the overall structure of the digital valve pack integrated unit configuration of the present invention;
fig. 2 is a cross-sectional view of a digital valve pack integrated unit configuration of the present invention;
FIG. 3 is a schematic diagram of the digital valve pack integrated unit configuration of the present invention;
FIG. 4 is a control block diagram of the digital valve pack integrated unit configuration of the present invention;
fig. 5 is a schematic diagram of different coding configuration forms of the digital valve group integrated unit configuration of the invention;
FIG. 6 is a closed-loop control flow following curve for a digital valve block integrated unit configuration using Peltier coding of the present invention;
the oil-gas separation device comprises a base plate valve block 1, a base plate valve block 2, a switch valve 3, a coil 4, an end cover 5, a pressure plate 6, a set screw 7, a pressure sensor 8, a digital flow control unit valve block 9, an upper oil duct 10, a lower oil duct 11, a normally closed oil outlet 12, a cylinder B connecting port 13, a T oil tank port 14 and an oil inlet.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
as shown in fig. 1 and fig. 2, a digital valve set integrated unit structure includes a bottom plate valve block 1, a plurality of switch valves 2, a coil 3, and a measurement and control assembly, four digital flow control unit valve blocks 8 are uniformly distributed above the bottom plate valve block 1, 4 sets of two layers of oil ducts corresponding to the digital flow control unit valve blocks 8 are arranged in the bottom plate valve block 1, the two layers of oil ducts are communicated with each other through a plurality of branches, a plurality of switch valves 2 which are distributed at equal intervals and control the branches are arranged on the upper side of the digital flow control unit valve blocks 8, preferably, the switch valves 2 are normally closed switch valves 2 with a two-position two-way structure, and the switch valves 2 adopt high-speed switch valves, and are characterized in that the digital valve set integrated unit structure can respond to control signals quickly and maintain original frequency characteristics;
the oil inlet end of one layer of oil duct in the two layers of oil ducts is communicated with the oil inlet 14 of the bottom plate valve block 1, the other end of the oil duct is sealed, one end of the other layer of oil duct is used for being connected with a cylinder port or an oil tank port and connected with a flow sensor, the other end of the oil duct is connected with the oil inlet end of the other layer of oil duct, a coil 3 is further arranged above the switch valve 2, the two layers of oil ducts are respectively provided with a pressure sensor 7, and a measurement and control assembly is connected with the pressure sensor 7, the flow sensor and the coil 3.
An upper oil passage 9 and a lower oil passage 10 are arranged in the bottom plate valve block 1; the upper oil duct 9 and the lower oil duct 10 on the rear side of the bottom plate valve block 1 correspond to the digital flow control unit valve block 8 arranged on the rear side above the bottom plate valve block 1, the upper oil duct 9 and the lower oil duct 10 on the front side of the bottom plate valve block 1 correspond to the digital flow control unit valve block 8 arranged on the front side above the bottom plate valve block 1, the upper side of the digital flow control unit valve block 8 is provided with a plurality of switching valves 2 distributed at equal intervals, so as to control the opening and closing of a plurality of branches between the upper oil duct 9 and the lower oil duct 10 corresponding to each digital flow control unit valve block 8, so that different coding configuration forms can be obtained by grouping the switching valves 2, and the requirements of different working conditions can be met and adapted.
The left and right sides of the upper oil duct 9 at the front side and the lower oil duct 10 at the rear side are provided with normally closed oil outlets 11 plugged by plugs, the left and right sides of the lower oil duct 10 at the front side are respectively provided with a cylinder connection B port 12 and a cylinder connection A port, the left and right sides of the upper oil duct 9 at the rear side are provided with T oil tank ports 13, and the front side of the bottom plate valve block 1 is provided with an oil inlet 14 communicated with the oil inlet end of the upper oil duct 9;
it should be noted that the present invention has a plurality of operation modes, and two operation modes are listed below to describe the oil flow in the oil passage:
the first working mode is as follows:
only the digital flow control unit valve block 8 on the front left side works, at the moment, a T oil tank port 13 and a cylinder receiving port A are blocked by using a plug, oil is fed from an oil inlet 14, flows into an upper oil duct 9, flows into a lower oil duct 10 through a switch valve 2 on the digital flow control unit valve block 8, and then flows into a hydraulic cylinder from a cylinder receiving port B12.
And a second working mode:
the four digital flow control unit valve blocks 8 all work, at this time, oil is fed from the oil inlet 14, flows into the upper oil ducts 9 on the two sides, respectively flows into the lower oil duct 10 on the front side through the switch valve 2 on the digital flow control unit valve block 8, then flows into the two cavities of the hydraulic cylinder through the cylinder connecting port B12 and the cylinder connecting port A, and when the oil is in the lower oil duct 10, the oil also flows into the lower oil duct 10 on the rear side, then flows into the upper oil duct 9 on the rear side through the switch valve 2, and then flows into the oil tank through the T oil tank port 13.
The periphery of the switch valve 2 is provided with an end cover 4 embedded on the upper surface of a digital flow control unit valve block 8, and the switch valve 2 and the end cover 4 are fastened through a pressure plate 5 on the upper side of the digital flow control unit valve block 8. At this time, the upper surface of the pressure plate 5 is provided with the set screws 6 positioned on both sides and between two adjacent switch valves 2, so that the fastening effect of the pressure plate 5 can be better.
The upper surface of the digital flow control unit valve block 8, the front surface and the rear surface of the digital flow control unit valve block 8 corresponding to the outer side of the bottom plate valve block 1 are in threaded connection with a plurality of pressure sensors 7 which are distributed at equal intervals, the pressure sensors 7 on the upper surface of the digital flow control unit valve block 8 are used for measuring the pressure of oil before passing through the switch valve 2, the pressure sensors 7 on the front surface and the rear surface of the digital flow control unit valve block 8 are used for measuring the pressure of the oil after passing through the switch valve 2, and the outer sides of the cylinder B port 12, the cylinder A port and the T oil tank port 13 are connected with flow sensors through oil pipes.
The measurement and control assembly comprises a controller, a collection card, an upper computer, an adjustable direct current power supply, a current sensor and a relay, wherein the adjustable direct current power supply is connected with a normally-open port of the relay, an output end of the controller is connected with a trigger port of the relay, the other end of the relay is connected with a coil 3 and the current sensor, an input end of the collection card is connected with output ends of a pressure sensor 7, a flow sensor and the current sensor respectively, an output end of the collection card is connected with an input end of the controller, and the controller is connected with the upper computer through a cable.
A control method for the configuration of a digital valve group integrated unit comprises the following steps:
the first step,
Selecting a control configuration according with the requirements of a user, grouping a plurality of switch valves 2 in a digital flow control unit valve block 8 to obtain combinations of different numbers of switch valves 2, and forming a required coding configuration form;
step two,
According to the flow demand of a user, the on-off state of each switch valve 2 in the digital flow control unit valve block 8 is calculated in real time through a flow equation, corresponding switch signals are output through a controller, and the corresponding switch valves 2 are driven to make corresponding actions by combining the control modes of PCM, PWM and the combination of the PCM and PWM;
step three,
The controller controls the acquisition card to acquire a flow signal sent by the flow sensor, compares the flow signal with the flow demand of a user, and further adjusts the flow signal to realize closed-loop control until the flow demand of the user is met.
The working principle and the using method are as follows:
as shown in fig. 4, the present invention provides a control block diagram matching with the configuration of the digital valve set integration unit, an ideal flow output value is given through an upper computer input signal, a suitable valve set configuration is determined, a controller based on a switching valve 2 model solves through an equation, a control signal is output, a flow sensor measures the flow output of the digital valve set integration unit and compares the error with the ideal value to form a closed-loop control, and accurate flow control is realized.
As shown in fig. 5, each rectangle in the figure represents one on-off valve 2, the rectangles with different gray scales represent a group of multiple on-off valves 2 controlled by the same signal, each column represents a control state, and the height of each column represents the flow output in the control state. The control algorithm is to calculate theoretical output of all combination modes of the valve group integration unit through the switch valve 2 model, compare the theoretical output with target output, select the combination mode with the minimum error and output a corresponding control signal.
The working process of the invention is divided into a preparation process and a test process, and the specific operation steps are as follows:
the preparation process comprises the following steps:
step one, connecting and fixing a bottom plate valve block 1 and a digital valve group flow control unit valve block through a set screw 6; the switch valve 2 is placed in a digital flow control unit valve block 8 for installation and is pressed tightly by a pressing plate 5; when the four digital flow control unit valve blocks 8 are used, an oil inlet 14 on the front surface of the bottom plate valve block 1 is communicated with high-pressure oil, T oil tank ports 13 on the left side and the right side are connected with a flow sensor through oil pipes and then are connected with an oil tank through the oil pipes, and a cylinder receiving port B12 and a cylinder receiving port A are connected with the flow sensor through the oil pipes and then are connected with a hydraulic cylinder through the oil pipes.
And (3) testing process:
and step two, selecting a control configuration conforming to the working condition, converting target flow input into a control signal to be output through a controller and an upper computer, outputting the control signal through a switch of a digital valve group (4 multiplied by 5), and comparing a signal acquired by a flow sensor with the target value to realize closed-loop control.
Fig. 6 is a flow following curve measured by taking 7 valve pellbooth codes as an example, the target flow output is set to be a sinusoidal periodic signal, the controller acquires the output flow through the flow sensor, discrete output of stepped flow is realized, the controllable range of the flow is enlarged, and accurate control of the hydraulic flow is realized.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (6)
1. The utility model provides an integrated unit configuration of digital valves, includes bottom plate valve block (1), a plurality of ooff valve (2), coil (3), observes and controls the subassembly, its characterized in that: four digital flow control unit valve blocks (8) are uniformly distributed above the bottom plate valve block (1), 4 groups of two layers of oil ducts corresponding to the digital flow control unit valve blocks (8) are arranged in the bottom plate valve block (1), the two layers of oil ducts are communicated with each other through a plurality of branches, a plurality of switch valves (2) which are distributed at equal intervals and control each branch are arranged on the upper side of the digital flow control unit valve block (8), the oil inlet end of one oil duct in one layer of the two layers of oil ducts is communicated with the oil inlet of the bottom plate valve block (1), the other end of the oil duct in the other layer is closed, one end of the other layer of oil duct is used for being connected with a cylinder connecting port or an oil tank port and connected with a flow sensor, the other end of the other layer of oil duct is connected with the oil inlet end of the other layer of oil duct, a coil (3) is further arranged above the switch valve (2), pressure sensors (7) are respectively arranged on the two layers of oil ducts, and a measurement and control assembly is connected with the pressure sensors (7), the flow sensors and the coil (3); the upper surface of the digital flow control unit valve block (8) and the front and rear surfaces of the digital flow control unit valve block (8) corresponding to the outer side of the bottom plate valve block (1) are in threaded connection with a plurality of pressure sensors (7) distributed at equal intervals;
the measurement and control assembly comprises a controller, a collection card, an upper computer, an adjustable direct current power supply, a current sensor and a relay, wherein the adjustable direct current power supply is connected with a normally-open port of the relay, an output end of the controller is connected with a trigger port of the relay, the other end of the relay is connected with the coil (3) and the current sensor, an input end of the collection card is respectively connected with output ends of the pressure sensor (7), the flow sensor and the current sensor, an output end of the collection card is connected with an input end of the controller, and the controller is connected with the upper computer through a cable;
the control method of the configuration of the digital valve group integrated unit comprises the following steps:
the first step,
Selecting a conforming control configuration according to the requirements of a user, grouping a plurality of on-off valves (2) in the digital flow control unit valve block (8), obtaining the combination of different numbers of on-off valves (2), and forming a required coding configuration form;
step two,
According to the flow demand of a user, the on-off states of all the switch valves (2) in the digital flow control unit valve block (8) are calculated in real time through a flow equation, corresponding switch signals are output through a controller, and the corresponding switch valves (2) are driven to make corresponding actions by combining a control mode of PCM, PWM and combination of the PCM and PWM;
step three,
The controller controls the acquisition card to acquire the flow signal sent by the flow sensor, compares the flow signal with the flow demand of a user, and further adjusts the flow signal to realize closed-loop control until the flow demand of the user is met.
2. The digital valve block integrated unit configuration according to claim 1, wherein: an upper oil duct (9) and a lower oil duct (10) are arranged in the bottom plate valve block (1); the upper oil duct (9) and the lower oil duct (10) on the rear side of the bottom plate valve block (1) correspond to the digital flow control unit valve block (8) on the rear side above the bottom plate valve block (1), the upper oil duct (9) and the lower oil duct (10) on the front side of the bottom plate valve block (1) correspond to the digital flow control unit valve block (8) on the front side above the bottom plate valve block (1), and a plurality of switching valves (2) distributed at equal intervals are arranged on the upper side of the digital flow control unit valve block (8) to control whether the upper oil duct (9) and the lower oil duct (10) corresponding to each digital flow control unit valve block (8) are communicated or not;
the utility model discloses a hydraulic control valve, including bottom plate valve piece (1), the left and right sides of the upper oil duct (9) of front side and the lower oil duct (10) of rear side is provided with normally closed oil-out (11) of plugging up with the plug, the left and right sides of the lower oil duct (10) of front side is provided with respectively and connects jar B mouth (12) and connect jar A mouth, the upper oil duct (9) left and right sides of rear side is provided with T oil tank mouth (13), bottom plate valve piece (1) front side be provided with oil inlet (14) of upper oil duct (9) intercommunication.
3. A digital valve pack integrated unit configuration according to claim 2, wherein: the periphery of the switch valve (2) is provided with an end cover (4) embedded on the upper surface of the digital flow control unit valve block (8), and the switch valve (2) and the end cover (4) are fastened through a pressing plate (5) on the upper side of the digital flow control unit valve block (8).
4. The digital valve block integrated unit configuration according to claim 3, wherein: and the upper surface of the pressure plate (5) is provided with a set screw (6) which is positioned between two sides and two adjacent switch valves (2).
5. A digital valve pack integrated unit configuration according to claim 2, wherein: the outer sides of the cylinder receiving port B (12), the cylinder receiving port A and the T oil tank port (13) are connected with a flow sensor through oil pipes.
6. The digital valve block integrated unit configuration according to claim 1, wherein: the switch valve (2) is a normally closed switch valve (2) with a two-position two-way structure.
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| US4207919A (en) * | 1975-09-19 | 1980-06-17 | Powell Industries, Inc. | Digital fluid flow control system |
| JPH02309070A (en) * | 1989-05-22 | 1990-12-25 | Hitachi Metals Ltd | Digital valve |
| CN103615443B (en) * | 2013-12-03 | 2016-04-06 | 三一汽车制造有限公司 | A kind of energy recovery hydraulic system and engineering machinery |
| CN105546162B (en) * | 2016-01-08 | 2017-12-26 | 浙江大学 | A kind of Combined digital valve and its method of load port independent control |
| CN105422921B (en) * | 2016-01-08 | 2018-07-24 | 浙江大学 | A kind of number valve cell and combinations thereof and control method |
| CN107477038B (en) * | 2016-06-07 | 2019-02-26 | 赵默林 | A kind of combined type pin hole Phalanx digital servo valve |
| CN109441904B (en) * | 2018-12-26 | 2020-07-14 | 燕山大学 | Digital valve bank PWM and PCM composite control device and control method thereof |
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