CN112727824A - Digital control device for controlling proportional valve - Google Patents
Digital control device for controlling proportional valve Download PDFInfo
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- CN112727824A CN112727824A CN202011523807.5A CN202011523807A CN112727824A CN 112727824 A CN112727824 A CN 112727824A CN 202011523807 A CN202011523807 A CN 202011523807A CN 112727824 A CN112727824 A CN 112727824A
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- stepping motor
- push rod
- proportional valve
- control device
- telescopic mechanism
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- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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
- 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
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
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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
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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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
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
- F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element
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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
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/24—Structural association with auxiliary mechanical devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses a digital control device for controlling a proportional valve, which comprises a stepping motor, a transmission mechanism and a telescopic mechanism, wherein the stepping motor is connected with the transmission mechanism; the stepping motor is provided with a stepping motor controller; the power input end of the transmission mechanism is connected with the power output shaft of the stepping motor, the power output end of the transmission mechanism is connected with the driving part of the telescopic mechanism, and the driven part of the telescopic mechanism corresponds to the valve core of the proportional valve. The stepping motor is digitally controlled, so that the control is simpler and the precision is higher. The electromagnet is easily interfered by electromagnetism, and the stepping motor is not interfered by electromagnetism. Further advances enable digitization of hydraulic valves.
Description
Technical Field
The invention relates to the technical field of proportional valves, in particular to a digital control device for controlling a proportional valve.
Background
At present, most of common proportional valves adopt proportional electromagnets, and the proportional electromagnets are designed according to an electromagnetic principle, so that mechanical quantity (force or moment and displacement) generated by the proportional electromagnets is proportional to the magnitude of an input electric signal (current), and then the position of a valve core of a hydraulic valve is continuously controlled, and further the pressure, the direction and the flow of a hydraulic system are continuously controlled. When a signal is input into the coil, the magnetic field in the coil generates acting force on the armature, the armature moves in the magnetic field in proportion and continuously according to the magnitude and direction of the signal current, and then the push rod is driven to move through the pins which are fixedly connected together, so that the movement of the valve core of the slide valve is controlled. The most widely applied is high voltage direct current resistance.
The input electrical signal is amplified by a proportional amplifier (typically 24 vdc, 800mA or greater rated current) and converted to a force or displacement to produce a displacement or angle of rotation that drives the movement of the pilot stage valve.
Simple structure, low cost, large output thrust and displacement, low requirement on oil quality and convenient maintenance. The main technical requirements for the method are as follows: firstly, the characteristic of horizontal displacement force, namely in an effective working stroke, when the current of a coil is constant, the output force of the coil is kept constant and is irrelevant to displacement; the steady-state current force characteristic has good linearity, and a small dead zone and hysteresis; and the dynamic characteristic has fast step response and high frequency response.
In industrial control, a stepping motor is inevitably used, how the stepping motor is controlled, how the speed, direction, drive current, and the like of the stepping motor are set, and a stepping motor controller is required.
Stepper motor controllers are commercially available in product form classified as:
a PLC; the PLC is a stepping motor controller which is most widely applied at present, the PLC has complete functions and generally has a plurality of paths of high-speed pulse output ports, namely, a plurality of stepping motors can be controlled simultaneously, but the PLC has complete functions, the stepping motor control is only a small part of the control function, and the PLC is not generally used if only the stepping motor is controlled.
A single chip microcomputer; the mode that the singlechip is used as a stepping motor controller is more, and the singlechip chips represented by STM32 and 51 generally have high-speed pulse output ports, but the development of the singlechip chips is more complicated, and the development of the singlechip chips is not more reimbursed if the singlechip chips are developed only for controlling the stepping motor.
A drive-control integrated stepper motor controller; the functions are mainly controlled around the stepping motor, the driving function of the stepping motor is included, and a driver is not required to be connected; the stepping motor has abundant IO interfaces, and can be connected with a stepping motor encoder, a motor limit switch, an electromagnetic band-type brake and the like; the controller is usually provided with bus interfaces of 232, 485, CANopen and the like, and can directly control the stepping motor on a computer by matching with corresponding debugging tool software; or the program is written on a computer and stored in the controller, the stepping motor is triggered and controlled through IO, and the controller is most commonly used at present if the stepping motor is controlled.
A coil spring capable of continuously providing a large restoring force in a narrow space
The mechanical part can be returned to its original position after one stroke of the part is completed, in preparation for the next stroke. The cable winding device is widely applied to garden tool starters, dust collectors and other cable winding components at present.
The coil spring is generally used as the power of a miniature machine without electric energy, such as the travel power of a mechanical clock and the power of a time telling system; the power of the disc rotation of the mechanical gramophone; a mechanical music box; an automatic player piano; power of the top string type toy, etc. The common point of machines powered by these types of spring is that the drive train is a speed-increasing mechanism, rather than a speed reducer as is commonly used in machines, and in addition, the torque output by the spring is large when it is tightened, but decreases considerably when it approaches full relaxation, and in order to reduce this uneven output torque of the spring, these devices have a speed-stabilizing mechanism which is used to stabilize the speed of rotation of the mechanism. In order to reduce the moment difference in the mechanical watch, a spring is specially made into an S shape in a free state instead of a plane equidistant spiral shape, so that the output moment of a coil spring is relatively balanced.
Most coil springs can be used to achieve the automatic reset within a certain range. For example, when a bench drill is used for drilling holes, the feeding handle is pressed to move the drill bit downwards, and after the holes are drilled, the drill bit can be automatically lifted back to the original position by loosening the hand, namely a coil spring is arranged in a shaft of the handle. There are many examples of the use of coil springs for repositioning in mechanical devices, and a wide variety of robots, printing machines, and packaging machines have numerous applications. Also, coil springs are often used for balancing. For example, a component is installed on a vertical guide rail, and is required to move up and down along the guide rail and be stably stopped at any position, the up and down movement of the component is pulled by a chain, the chain is lengthened along with the downward movement of the component, and the weight of the chain is heavier than that of the component at the upper end of the guide rail, so that the total weight of the component and the chain is different at different positions of the component above and below, and the unbalance at different positions can be balanced by a coil spring.
According to the principle, a controller with digital control is developed and developed for controlling the proportional valve, so that the original electric proportional valve is digitally controlled and becomes the digital proportional valve.
Disclosure of Invention
The present invention aims to provide a digital control device for controlling a proportional valve, which aims to overcome the defects of the prior art, wherein a stepping motor is digitally controlled, so that the control is simpler and the precision is higher. The electromagnet is easily interfered by electromagnetism, and the stepping motor is not interfered by electromagnetism. Further advances enable digitization of hydraulic valves.
In order to achieve the purpose, the invention adopts the following technical scheme:
a digital control device for controlling a proportional valve comprises a stepping motor, a transmission mechanism and a telescopic mechanism;
the stepping motor is provided with a stepping motor controller;
the power input end of the transmission mechanism is connected with the power output shaft of the stepping motor, the power output end of the transmission mechanism is connected with the driving part of the telescopic mechanism, and the driven part of the telescopic mechanism corresponds to the valve core of the proportional valve.
Further, still include the casing, step motor, drive mechanism, telescopic machanism are all arranged in the casing, the guide hole that is used for exposing the telescopic machanism follower is seted up to the casing.
Further, the telescopic mechanism comprises a push rod and a lead screw;
the push rod is a driven part of the telescopic mechanism, the push rod is a hollow push rod, and the front end of the hollow push rod is provided with an expanding contact;
the inner wall of the hollow push rod is provided with internal threads, the lead screw is a driving part of the telescopic mechanism, and the lead screw is assembled in the hollow push rod to form a spiral telescopic mechanism.
Further, the transmission mechanism comprises a driving gear and a driven gear which are meshed with each other, the driving gear is connected with an output shaft of the motor, and the driven gear is connected with the lead screw.
Further, the automatic screw rod resetting device further comprises a resetting mechanism, and the resetting mechanism is connected with the rear end of the screw rod.
Further, the return mechanism is a coil spring.
Compared with the prior art, the invention has the following beneficial effects:
the stepping motor can control the forward rotation, the reverse rotation and the rotation speed according to given digital quantity under the control of the stepping controller. The driving gear drives the driven gear to rotate under the driving of the stepping motor, so that the lead screw rotates to drive the push rod to move. The movement of the push rod drives the position of the valve core of the hydraulic valve, and further the pressure, the direction and the flow of the hydraulic system are controlled. The coil spring is used as a mechanical reset mechanism, and drives the lead screw to rotate under the condition of unexpected power failure or power failure after work, so that the push rod returns to the original position, and the valve core of the hydraulic valve returns to the original position.
1. The stepping motor is digitally controlled, so that the control is simpler and the precision is higher.
2. The electromagnet is easily interfered by electromagnetism, and the stepping motor is not interfered by electromagnetism.
3. Further advances enable digitization of hydraulic valves.
Drawings
Fig. 1 is a schematic structural diagram of a digital control device for controlling a proportional valve according to the present invention.
Reference numbers of parts in the figures: 1- -step motor; 2- -driving gear; 3-coil spring; 4- -driven gear; 5- -the shell; 6- -leading screw; 7- -push rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
a digital control device for controlling a proportional valve comprises a stepping motor 1, a transmission mechanism and a telescopic mechanism;
the stepping motor is provided with a stepping motor controller;
the power input end of the transmission mechanism is connected with the power output shaft of the stepping motor, the power output end of the transmission mechanism is connected with the driving part of the telescopic mechanism, and the driven part of the telescopic mechanism corresponds to the valve core of the proportional valve.
Further, still include casing 5, step motor, drive mechanism, telescopic machanism are all arranged in the casing, the guide hole that is used for exposing the telescopic machanism follower is seted up to the casing.
Further, the telescopic mechanism comprises a push rod 7 and a lead screw 6;
the push rod is a driven part of the telescopic mechanism, the push rod is a hollow push rod, and the front end of the hollow push rod is provided with an expanding contact;
the inner wall of the hollow push rod is provided with internal threads, the lead screw is a driving part of the telescopic mechanism, and the lead screw is assembled in the hollow push rod to form a spiral telescopic mechanism.
Further, the transmission mechanism comprises a driving gear 2 and a driven gear 4 which are meshed with each other, the driving gear is connected with an output shaft of the motor, and the driven gear is connected with the lead screw.
Further, the automatic screw rod resetting device further comprises a resetting mechanism, and the resetting mechanism is connected with the rear end of the screw rod.
Further, the return mechanism is a coil spring 3.
The working principle is as follows:
the stepping motor 1 can perform normal rotation, reverse rotation, and speed control of rotation according to a given digital value under the control of a stepping controller. The driving gear 2 drives the driven gear 4 to rotate under the driving of the stepping motor, so that the screw rod 6 rotates to drive the push rod 7 to move. The movement of the push rod 7 drives the position of the valve core of the hydraulic valve, and further the pressure, the direction and the flow of the hydraulic system are controlled. The coil spring 3 is used as a mechanical reset mechanism, and drives the screw rod 6 to rotate under the condition of unexpected power failure or power failure after work, so that the push rod 7 returns to the original position, and the valve core of the hydraulic valve returns to the original position.
The invention has the advantages that:
1. the stepping motor is digitally controlled, so that the control is simpler and the precision is higher.
2. The electromagnet is easily interfered by electromagnetism, and the stepping motor is not interfered by electromagnetism.
3. Further advances enable digitization of hydraulic valves.
All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A digital control device for controlling a proportional valve is characterized by comprising a stepping motor, a transmission mechanism and a telescopic mechanism;
the stepping motor is provided with a stepping motor controller;
the power input end of the transmission mechanism is connected with the power output shaft of the stepping motor, the power output end of the transmission mechanism is connected with the driving part of the telescopic mechanism, and the driven part of the telescopic mechanism corresponds to the valve core of the proportional valve.
2. The digital control device for controlling the proportional valve according to claim 1, further comprising a housing, wherein the stepping motor, the transmission mechanism and the telescoping mechanism are all disposed in the housing, and the housing is provided with a guide hole for exposing the follower of the telescoping mechanism.
3. A digital control device for controlling a proportional valve according to claim 1 or 2, wherein the telescopic mechanism comprises a push rod, a lead screw;
the push rod is a driven part of the telescopic mechanism, the push rod is a hollow push rod, and the front end of the hollow push rod is provided with an expanding contact;
the inner wall of the hollow push rod is provided with internal threads, the lead screw is a driving part of the telescopic mechanism, and the lead screw is assembled in the hollow push rod to form a spiral telescopic mechanism.
4. The numerical control device of claim 3, wherein the transmission mechanism comprises a driving gear and a driven gear which are meshed with each other, the driving gear is connected with an output shaft of the motor, and the driven gear is connected with the lead screw.
5. The numerical control apparatus of claim 4, further comprising a reset mechanism, wherein the reset mechanism is connected to the rear end of the lead screw.
6. The digital control device for controlling a proportional valve of claim 5, wherein the return mechanism is a coil spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523807.5A CN112727824A (en) | 2020-12-21 | 2020-12-21 | Digital control device for controlling proportional valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523807.5A CN112727824A (en) | 2020-12-21 | 2020-12-21 | Digital control device for controlling proportional valve |
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| Publication Number | Publication Date |
|---|---|
| CN112727824A true CN112727824A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011523807.5A Pending CN112727824A (en) | 2020-12-21 | 2020-12-21 | Digital control device for controlling proportional valve |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003307307A (en) * | 2002-04-16 | 2003-10-31 | Noritz Corp | Gas flow control valve and combustion equipment with this gas flow control valve |
| US20070102660A1 (en) * | 2005-11-04 | 2007-05-10 | Denso Corporation | Torque-transmitting device for use in air control valve |
| CN201772128U (en) * | 2010-07-23 | 2011-03-23 | 苏州市职业大学 | Automatic adjusting stepping overflow valve |
| CN102359640A (en) * | 2011-09-14 | 2012-02-22 | 浙江福禄克燃气仪表有限公司 | Special motor valve for intelligent gas meter control |
| CN103090048A (en) * | 2011-10-27 | 2013-05-08 | 北京精密机电控制设备研究所 | High-flow direct-drive digital servo valve |
| CN104595497A (en) * | 2015-01-09 | 2015-05-06 | 四川大学 | Novel intelligent gas meter motor valve |
| CN110168267A (en) * | 2016-12-22 | 2019-08-23 | Cpt集团有限责任公司 | Valve gear for motor vehicles |
| CN112013149A (en) * | 2020-09-15 | 2020-12-01 | 战江东 | Linear actuating mechanism of opening-controllable control valve of fuel cell and internal combustion engine |
| CN214366960U (en) * | 2020-12-21 | 2021-10-08 | 山东常林机械集团股份有限公司 | Digital control device for controlling proportional valve |
-
2020
- 2020-12-21 CN CN202011523807.5A patent/CN112727824A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003307307A (en) * | 2002-04-16 | 2003-10-31 | Noritz Corp | Gas flow control valve and combustion equipment with this gas flow control valve |
| US20070102660A1 (en) * | 2005-11-04 | 2007-05-10 | Denso Corporation | Torque-transmitting device for use in air control valve |
| CN201772128U (en) * | 2010-07-23 | 2011-03-23 | 苏州市职业大学 | Automatic adjusting stepping overflow valve |
| CN102359640A (en) * | 2011-09-14 | 2012-02-22 | 浙江福禄克燃气仪表有限公司 | Special motor valve for intelligent gas meter control |
| CN103090048A (en) * | 2011-10-27 | 2013-05-08 | 北京精密机电控制设备研究所 | High-flow direct-drive digital servo valve |
| CN104595497A (en) * | 2015-01-09 | 2015-05-06 | 四川大学 | Novel intelligent gas meter motor valve |
| CN110168267A (en) * | 2016-12-22 | 2019-08-23 | Cpt集团有限责任公司 | Valve gear for motor vehicles |
| CN112013149A (en) * | 2020-09-15 | 2020-12-01 | 战江东 | Linear actuating mechanism of opening-controllable control valve of fuel cell and internal combustion engine |
| CN214366960U (en) * | 2020-12-21 | 2021-10-08 | 山东常林机械集团股份有限公司 | Digital control device for controlling proportional valve |
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