CN104879505A - Servo electric valve for interlocking control of fan and wind pressure - Google Patents

Servo electric valve for interlocking control of fan and wind pressure Download PDF

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Publication number
CN104879505A
CN104879505A CN201510291577.7A CN201510291577A CN104879505A CN 104879505 A CN104879505 A CN 104879505A CN 201510291577 A CN201510291577 A CN 201510291577A CN 104879505 A CN104879505 A CN 104879505A
Authority
CN
China
Prior art keywords
valve body
circuit
valve
blade
blower fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510291577.7A
Other languages
Chinese (zh)
Inventor
张荣全
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Rong Quan Development In Science And Technology Co Ltd
Original Assignee
Jiangsu Rong Quan Development In Science And Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Rong Quan Development In Science And Technology Co Ltd filed Critical Jiangsu Rong Quan Development In Science And Technology Co Ltd
Priority to CN201510291577.7A priority Critical patent/CN104879505A/en
Publication of CN104879505A publication Critical patent/CN104879505A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32Details
    • F16K1/34Cutting-off parts, e.g. valve members, seats
    • F16K1/36Valve members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00Construction of housing; Use of materials therefor
    • F16K27/02Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209Check valves or pivoted valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/02Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/042Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/02Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/043Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters

Abstract

The invention relates to a servo electric valve for interlocking control of a fan and wind pressure. The servo electric valve comprises a valve body and an electric actuator, wherein rotating shafts are arranged in the valve body in parallel at equal distances, transmission gears are arranged at the ends of the rotating shafts, and two adjacent transmission gears are meshed with each other. Blades and position detection devices are arranged on the rotating shafts; a micro wind pressure sensor and a wind volume sensor are arranged in the valve body, and the micro wind pressure sensor is fixedly arranged on the side wall of the valve body. A transmission connection rod is coaxially arranged on the axis center portion of the transmission gear located at the center of the valve body and is connected with the electric actuator. The electric actuator comprises a power supply, a servo controller and a servo motor, wherein the servo controller and the servo motor are electrified by the power supply, an output shaft of the servo motor is connected with an input of a speed reducer through a coupler, and an output of the speed reducer is connected with the transmission connection rod. The position detection devices, the micro wind pressure sensor, the wind volume sensor and the servo motor are electrically connected with the servo controller through a data transmission lead.

Description

A kind of blower fan and blast chain control servo-electric valve
Technical field
The present invention relates to a kind of electric valve, specifically a kind of servo-electric valve for blower fan and the chain control of blast, belongs to industrial process measurement and control instrument field.
Background technique
Along with the lifting of textile industry quality of product and continuing to increase of the market demand, the processing quality of textile product and the adjustment to air require more and more higher, thus there has also been higher requirement to the air-supply rate of ventilation in workshop and temperature and humidity.Weaving axial-flow blower (hereinafter referred to as " blower fan ") is the nucleus equipment of synthetic fiber spinning air-conditioning system blower coil pipe, is the wind regime guarantee in manufacturing shop air feed and air conditioning, the important component part of Ye Shi air conditioning chamber energy saving of system simultaneously.At present, blower fan is driven by unidirectional how fast low noise induction machine, by regulating input voltage to change rotation speed of fan, making fan delivery be divided into high, medium and low three gears, being controlled by electric switch, cooling (heat) amount of corresponding adjustment fan coil unit.The installation of fan coil unit adopts centralized installation more, and namely a supervisor adds root branch road and is in charge of, each branch road linking number Fans coil pipe, and on branch road, each fan coil unit adopts series system.
Volume damper (hereinafter referred to as " air-valve ") is the requisite accessory of air-conditioning system end, is generally used in air system plumbing, is used for regulating the air quantity of arm, also can be used for new wind and regulates with mixing of return air.The driving mode of existing air-valve has manual, pneumatic and electronic, because the degree of regulation of hand_pneumatic valve is low, is replaced gradually by pneumatic blast gate and Electric air valve.
Mostly existing blower fan and Electric air valve are separately control opening and closing separately and do not have coordinated signals, be difficult to the coordinate synchronization of accomplishing both opening and closings like this, thus often occur Electric air valve to close and blower fan also to run or blower fan stopped and phenomenon that Electric air valve is still opened, and then cause and there is potential safety hazard in energy waste, reduction of service life, cold draining and air channel.In view of the technical problem existed in prior art, therefore, a kind of new Electric air valve of exigence solves the problems of the technologies described above.
Summary of the invention
The present invention is just for the technical problem existed in prior art, and provide a kind of blower fan and blast chain control servo-electric valve, overall construction design is ingenious, easy for installation, can effectively solve air-valve complicated operation, easy fault, and energy consumption is large, the problem that the life-span is short.
To achieve these goals, the technical solution used in the present invention is, a kind of blower fan and blast chain control servo-electric valve, comprise valve body and the electric actuator being arranged at valve body outside, be provided with multiple rotatingshaft the interior parallel of described valve body is equidistant, the two ends of described rotatingshaft are arranged on the both sides of valve body, and the rotating shaft one end be positioned at outside valve body is installed with driving gear, and adjacent two driving gears engage each other; Be provided with blade and position detecting device on the rotating shaft, the intermediate portion of described valve body is provided with miniature wind pressure sensor and air flow sensor, the rounded top being distributed in blade of described air flow sensor, and being fixedly mounted on mounting groove, described miniature wind pressure sensor is fixedly mounted on body wall; Kinematic link is coaxially arranged with at the axis central part being positioned at the driving gear in the middle part of valve body, described kinematic link connects electric actuator, described electric actuator comprises power supply, servocontroller and actuating motor, described servocontroller and actuating motor adopt Power supply, the output shaft of described actuating motor is connected with retarder input by coupling, the output of retarder is connected with kinematic link, and described position detecting device, miniature wind pressure sensor, air flow sensor and actuating motor are electrically connected with servocontroller by data transmission wires.
As a modification of the present invention, described valve body is provided with blade limiting stopper, described blade limiting stopper is positioned at the top of rotatingshaft, and the maximum rotation angle of limit blade is 90 degree, prevents blade from arbitrarily swinging.
As a modification of the present invention, described valve body is square, employing galvanized sheet processes, and antirust treatment is carried out to galvanized sheet otch, described blade and rotatingshaft adopt aluminium alloy material package integral processing and fabricating to form, make can not produce slip between blade and rotatingshaft, be convenient to the aperture accurately controlling blade.
As a modification of the present invention, described servocontroller comprises power circuit, data processing system and circuit for controlling motor, described power circuit comprises current rectifying and wave filtering circuit, transformation buffer circuit and mu balanced circuit, and described data processing system comprises microprocessor, data storage, photoelectric isolating circuit, axle parallactic angle degree measuring circuit and sensor signal processing circuit.
As a modification of the present invention, described actuating motor adopts brushless DC servomotor, and brushless DC servomotor is connected with circuit for controlling motor, and the model of the control chip that described circuit for controlling motor adopts is MC33035.
As a modification of the present invention, a side end face of described valve body being provided with multiple mounting hole, adopting fastening piece to be connected with blower fan main frame by mounting hole, opposite side end face is established and only has multiple connection buckle, being connected with ventilation duct by connecting buckle.
As a modification of the present invention, the two edges of described blade are provided with flexible sealing strip, after blade is closed, Stamping Steel Ribbon contacts with each other and plays the effect of sealing, the two end part of described blade are provided with sealing cotton, described sealing is cotton between vane end faces and valve interior wall, and then to the sealing gap process between blade and valve body.
Relative to prior art, advantage of the present invention is as follows, 1) overall construction design is ingenious, can realize the Intelligent adjustment of valve opening angle, reduces pipeline crushing, and improve fan efficiency, noise is low, and cost is lower; 2) carry out transmission joint by driving gear and kinematic link between rotatingshaft and actuating motor, structure is simple, reliable, adopts position detecting device to replace traditional encoder, forms closed loop control, further increase control accuracy with servocontroller; 3) position detecting device adopted adopts contactless installation, and shock resistance is good, even if also can normally work under rugged environment, and good reliability; 4) miniature air quantity and wind pressure sensor is provided with in valve body, Real-Time Monitoring is carried out to the air quantity in valve and blast and detection data are delivered to servocontroller, and brushless DC servomotor smooth operation under the control of MC33035, thus the aperture that can control arbitrarily blade; 5) be provided with microcontroller in the servocontroller of electric actuator, communication can be carried out with controller of fan easily, receive and sending controling instruction, realize the coordinated signals of blower fan and Electric air valve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A-A sectional view in Fig. 1.
Fig. 3 is the theory diagram that in the present invention, electric actuator is connected with position detecting device and sensor.
In figure: 1-valve body, 2-electric actuator, 3-rotatingshaft, 4-blade, 5-flexible sealing strip, 6-seals cotton, 7-blade limiting stopper, 8-mounting hole, and 9-connects buckle, 10-air flow sensor, the miniature wind pressure sensor of 11-, 12-pressure acquisition point.
Embodiment
In order to deepen the understanding of the present invention and understanding, below in conjunction with accompanying drawing, the invention will be further described and introduce.
As Fig. 1-Fig. 3, a kind of blower fan and blast chain control servo-electric valve, comprise square valve body 1 and the electric actuator 2 being arranged at valve body outside, described valve body 1 adopts galvanized sheet to process, and antirust treatment is carried out to galvanized sheet otch, be provided with multiple rotatingshaft 3 the interior parallel of described valve body is equidistant, the two ends of all rotatingshafts are arranged on the axle sleeve of valve body both sides, the rotating shaft one end be arranged in outside valve body is installed with driving gear (figure does not mark), and adjacent two driving gears engage each other.All rotatingshafts are provided with blade 4, described blade 4 adopts aluminium alloy material package integral processing and fabricating to form with rotatingshaft 3, flexible sealing strip 5 is provided with in the two edges of blade, after blade is closed, Stamping Steel Ribbon contacts with each other and plays the effect of sealing, and sealing cotton 6 is provided with at the two end part of blade, described sealing cotton 6 between vane end faces and valve interior wall, and then to the sealing gap process between blade and valve body.In addition, also on described valve body 1, be provided with the blade limiting stopper 7 consistent with rotatingshaft quantity, described blade limiting stopper 7 is positioned at the top of rotatingshaft, and the maximum rotation angle for limit blade is 90 degree, prevents blade from arbitrarily swinging.Be provided with position detecting device (figure does not mark) being arranged on the rotatingshaft in the middle part of valve body, for the aperture of the rotation angle and then monitoring blade that detect rotatingshaft in real time.The intermediate portion of described valve body 1 is provided with miniature wind pressure sensor 11 and air flow sensor 10, the rounded top being distributed in blade of described air flow sensor 10, and be fixedly mounted on mounting groove, for detecting the air quantity flowing through valve body in real time, described miniature wind pressure sensor 11 is fixedly mounted on body wall, pressure acquisition point 12 faces toward to come flow path direction, for detecting the blast parameter in valve body in real time.Kinematic link (figure does not mark) is coaxially arranged with at the axis central part being arranged in the driving gear in the middle part of valve body, described kinematic link connects electric actuator, controlled the running of kinematic link by electric actuator, and then realize the Intelligent adjustment of valve body intra vane opening angle.And multiple mounting hole 8 is provided with on a side end face of described valve body, opposite side end face being established and only has multiple connection buckle 9, during use, adopt fastening piece to be connected with blower fan main frame by mounting hole, being connected with ventilation duct by connecting buckle.
As shown in Figure 3, described electric actuator comprises power supply, servocontroller and actuating motor, described servocontroller and actuating motor adopt Power supply, the output shaft of described actuating motor is connected with retarder input by coupling, the output of retarder is connected with kinematic link, and described position detecting device, miniature wind pressure sensor, air flow sensor and actuating motor are electrically connected with servocontroller by data transmission wires.Described position detecting device adopts magnetic ring and magnetic induction part to make, and the magnetic signal sensed is converted to voltage signal by described magnetic induction part, and is sent to servocontroller.Described actuating motor adopts brushless DC servomotor.Described servocontroller comprises power circuit, data processing system and circuit for controlling motor, and the control chip model that described circuit for controlling motor adopts is MC33035, and brushless DC servomotor is connected with circuit for controlling motor.Described power circuit comprises transformation buffer circuit, current rectifying and wave filtering circuit and mu balanced circuit, and described data processing system comprises microprocessor, data storage, photoelectric isolating circuit, axle parallactic angle degree measuring circuit and sensor signal processing circuit.Described microprocessor adopts single-chip microcomputer or digital signal processing chip to control, and described data storage connects microprocessor, and described circuit for controlling motor, axle parallactic angle degree measuring circuit are connected with microprocessor by photoelectric isolating circuit with sensor signal processing circuit.Servocontroller controls driven by servomotor retarder and drives all rotatingshafts to rotate by kinematic link and then control the aperture of blade, the output of servocontroller becomes the resistance of certain function relation or the change of voltage with the mechanical displacement of kinematic link, realizes the aperture controlling blade continuously, exactly.
It should be noted that above-described embodiment, be not used for limiting protection scope of the present invention, equivalents done on the basis of technique scheme or the alternative scope all falling into the claims in the present invention and protect.In the claims, word " comprises " and does not get rid of existence and do not arrange element in the claims.

Claims (7)

1. a blower fan and blast chain control servo-electric valve, it is characterized in that: comprise valve body and the electric actuator being arranged at valve body outside, be provided with multiple rotatingshaft the interior parallel of described valve body is equidistant, the two ends of described rotatingshaft are arranged on the both sides of valve body, the rotatingshaft one end be positioned at outside valve body is installed with driving gear, and adjacent two driving gears engage each other; Be provided with blade and position detecting device on the rotating shaft, the intermediate portion of described valve body is provided with miniature wind pressure sensor and air flow sensor, the rounded top being distributed in blade of described air flow sensor, and being fixedly mounted on mounting groove, described miniature wind pressure sensor is fixedly mounted on body wall; Kinematic link is coaxially arranged with at the axis central part being positioned at the driving gear in the middle part of valve body, described kinematic link connects electric actuator, described electric actuator comprises power supply, servocontroller and actuating motor, described servocontroller and actuating motor adopt Power supply, the output shaft of described actuating motor is connected with retarder input by coupling, the output of retarder is connected with kinematic link, and described position detecting device, miniature wind pressure sensor, air flow sensor and actuating motor are electrically connected with servocontroller by data transmission wires.
2. a kind of blower fan as claimed in claim 1 and blast chain control servo-electric valve, it is characterized in that, described valve body is square, adopts galvanized sheet to process, and antirust treatment is carried out to galvanized sheet otch, described blade and rotatingshaft adopt aluminium alloy material package integral processing and fabricating to form.
3. a kind of blower fan as claimed in claim 1 and blast chain control servo-electric valve, it is characterized in that, described valve body is provided with blade limiting stopper, and described blade limiting stopper is positioned at the top of rotatingshaft.
4. a kind of blower fan as claimed in claim 1 or 2 and blast chain control servo-electric valve, it is characterized in that, the two edges of described blade are provided with flexible sealing strip, and the two end part of described blade are provided with sealing cotton, and described sealing is cotton between vane end faces and valve interior wall.
5. a kind of blower fan as claimed in claim 1 and blast chain control servo-electric valve, it is characterized in that, described servocontroller comprises power circuit, data processing system and circuit for controlling motor, described power circuit comprises current rectifying and wave filtering circuit, transformation buffer circuit and mu balanced circuit, and described data processing system comprises microprocessor, data storage, photoelectric isolating circuit, axle parallactic angle degree measuring circuit and sensor signal processing circuit.
6. a kind of blower fan as claimed in claim 5 and blast chain control servo-electric valve, it is characterized in that, described actuating motor adopts brushless DC servomotor, brushless DC servomotor is connected with circuit for controlling motor, and the model of the control chip that described circuit for controlling motor adopts is MC33035.
7. a kind of blower fan as claimed in claim 1 or 2 and blast chain control servo-electric valve, it is characterized in that, one side end face of described valve body is provided with multiple mounting hole, adopts fastening piece to be connected with blower fan main frame by mounting hole, opposite side end face is established and only has multiple connection buckle.
CN201510291577.7A 2015-06-01 2015-06-01 Servo electric valve for interlocking control of fan and wind pressure Pending CN104879505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510291577.7A CN104879505A (en) 2015-06-01 2015-06-01 Servo electric valve for interlocking control of fan and wind pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510291577.7A CN104879505A (en) 2015-06-01 2015-06-01 Servo electric valve for interlocking control of fan and wind pressure

Publications (1)

Publication Number Publication Date
CN104879505A true CN104879505A (en) 2015-09-02

Family

ID=53947115

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510291577.7A Pending CN104879505A (en) 2015-06-01 2015-06-01 Servo electric valve for interlocking control of fan and wind pressure

Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108119677A (en) * 2018-01-08 2018-06-05 致和环境科技(江苏)有限公司 A kind of check-valves
CN112576766A (en) * 2020-12-10 2021-03-30 艾尔科建设工程(江苏)有限公司 Constant air volume valve with duty mode
CN113685372A (en) * 2021-08-30 2021-11-23 华能山东石岛湾核电有限公司 Non-return device of fan export and have its fan
CN115104551A (en) * 2022-07-20 2022-09-27 四川晟兴智能科技有限公司 Speed reducer limiting device for cultivation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108119677A (en) * 2018-01-08 2018-06-05 致和环境科技(江苏)有限公司 A kind of check-valves
CN112576766A (en) * 2020-12-10 2021-03-30 艾尔科建设工程(江苏)有限公司 Constant air volume valve with duty mode
CN112576766B (en) * 2020-12-10 2022-09-27 艾尔科建设工程(江苏)有限公司 Constant air volume valve with duty mode
CN113685372A (en) * 2021-08-30 2021-11-23 华能山东石岛湾核电有限公司 Non-return device of fan export and have its fan
CN115104551A (en) * 2022-07-20 2022-09-27 四川晟兴智能科技有限公司 Speed reducer limiting device for cultivation

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Application publication date: 20150902