CN113833602B - Manual operation module of variable pitch control system and control method thereof - Google Patents
Manual operation module of variable pitch control system and control method thereof Download PDFInfo
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- CN113833602B CN113833602B CN202111130225.5A CN202111130225A CN113833602B CN 113833602 B CN113833602 B CN 113833602B CN 202111130225 A CN202111130225 A CN 202111130225A CN 113833602 B CN113833602 B CN 113833602B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000005286 illumination Methods 0.000 claims description 10
- 238000012937 correction Methods 0.000 claims description 8
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Feedback Control In General (AREA)
Abstract
The invention relates to the field of wind power generation pitch control systems, and discloses a manual operation module of a pitch control system, which comprises a driver, a signal conversion module, 4 regulating switches, a manual/automatic switch and an illuminating lamp switch, wherein the illuminating lamp switch is arranged on a serial link of illuminating lamps of three pitch control cabinets, the 4 regulating switches are respectively connected with the driver through the signal conversion module, one end of the manual/automatic switch is connected with the driver, and the other end of the manual/automatic switch is connected with the driver through a limit switch of another two pitch control cabinets in series. The invention can reduce the occupation of the I/O port of the driver through the signal conversion module, has simple structure and gathers the manual operation switches together, thereby being convenient for operators to operate.
Description
Technical Field
The invention relates to the field of wind power generation pitch control, in particular to a manual operation module of a pitch control system and a control method thereof.
Background
Wind energy is widely focused as pollution-free renewable energy, and rapidly develops, so that the wind energy has wide development prospect in wind power generation in China. The pitch control system is used as an important component of the wind generating set, plays an important role in wind power generation, is used as a manual feathering device for manually feathering during normal daily maintenance and fault conditions, and the manual operation box plays a small role, so that the pitch control system is a bridge for man-machine interaction.
The traditional manual operation switch for pitch control transmits a switch signal to the driver for processing through an I/O port of the driver, so that a large number of driver interfaces are occupied, and the use of the driver interfaces becomes tension. Or some pitch control systems adopt a mode of an independent operating handle to carry out manual control of the pitch control system, although the mode of using the operating handle can save cost, a heavy-load contact pin used by the operating handle can be more easily damaged through long-term insertion and extraction, and if the heavy-load contact pin is not provided with spare parts, the maintenance time is longer and the maintenance cost is higher
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the manual operation module of the pitch control system and the control method thereof, which not only centralize most of operation requirements of the pitch control system, but also can avoid occupation of a manual switch to an I/O port of a driver through the use of the device, and simultaneously facilitate operation of operators.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a become manual operation module of oar control system, includes driver, signal conversion module, 4 regulating switch, manual/automatic switch and light switch, the light switch sets up on the serial link of the light of three become oar switch board, and 4 regulating switch pass through respectively signal conversion module is connected with the driver, manual/automatic switch's one end with the driver is connected, manual/automatic switch's the other end is connected with the driver through the limit switch of two other change oar switch in series.
As an optimization, the 4 adjusting switches comprise:
zero-correction switch: adopting a button switch to clear the position of the motor encoder and the position of the blade encoder simultaneously;
reset/bypass switch: the three-position self-resetting switch is adopted, the resetting switch resets a fault signal which is reported by the variable pitch control system, and the bypass switch is used for continuing manual variable pitch when the variable pitch control system is in an automatic mode and the blades rotate to a safe angle of the limit switch;
fast/slow switch: setting the rotation speed of the blade by adopting a three-position self-resetting selection switch;
forward/reverse switch: the self-locking selector switch is adopted, the forward direction is the direction of 90 degrees for changing the pitch, and the backward direction is the direction of 0 degrees for changing the pitch.
As optimization, the input end of the signal conversion module is provided with a Ref port, a Res port, a Bypass port, a Fast port, a low port and a forward port, wherein the Ref port is connected with a zero correction switch, the Res port is connected with a reset end of a reset/Bypass switch, the Bypass port is connected with a Bypass end of the reset/Bypass switch, the Fast port is connected with a Fast end of a Fast/Slow switch, the Slow port is connected with a Slow end of the Fast/Slow switch, the forward port is connected with a forward/backward switch, when the forward/backward switch is turned off, the direction of a blade is forward, and when the forward/backward switch is turned off, the direction of the blade is backward; the output end of the signal conversion module is provided with a 5V power supply end, a serial port A, a serial port B and a grounding end GND, the 5V power supply end is connected with a 5Vout port of the driver, the serial port A is connected with an RS485+ port of the driver, the serial port B is connected with an RS 485-port of the driver, and one of contacts of the grounding end GND, the switches 1S1, 2S1, 4S1, 5S1 and 6S1 is connected with an EGND port of the driver.
As optimization, the manual/automatic switch adopts a two-position self-locking switch for selecting the operation mode of the pitch control system, one end of the manual/automatic switch is connected with a manual control interface of a driver, namely a manual interface, and the other end is connected with an EGN of an EGND/signal conversion module of an RS485 serial port of the driver, and the safety interlock of the pitch control system is introduced in a mode that relay contacts of a pitch control cabinet No. 2 and a pitch control cabinet No. 3 are connected in series through a heavy-load connector in the middle, namely, manual operation can be performed only when the other two cabinets are in a safety position, and manual operation cannot be performed even if the manual/automatic switch is placed in the manual position when any one of the other two cabins is not in the safety position.
As an optimization, two key switches are arranged at two ends of a serial circuit of limit switches 15K1 of the other two variable-pitch control cabinets in parallel, and the key switches are used for canceling the manual interlocking function of the two variable-pitch control cabinets. The key switch needs to be held by specific personnel and cannot be easily used by other people, the key switch is designed to facilitate debugging when the pitch control system is hoisted, and the key switch cannot be easily used for system safety after hoisting. The invention also discloses a control method of the manual operation module of the pitch control system, the pitch control system receives a trigger signal and enters a corresponding mode, the trigger signal comprises a manual signal, and the control method after receiving the manual signal is as follows:
s1, entering a manual operation mode;
s2, judging whether the blade position is 0-91 degrees, if so, entering S3, and if not, entering S8;
s3, selecting the running direction of the blade;
s4, selecting the running speed of the blade;
s5, judging whether a reset signal is received, if so, entering S6; if not, entering S8;
s6, judging whether the duration of the reset signal is less than 6S, if so, entering S7; if not, entering a forced manual mode;
s7, resetting the pitch failure;
s8, judging whether a limit switch is triggered by the pitch control system, if so, entering S9, and if not, entering S10;
s9, triggering a bypass button, and releasing after leaving the limit switch;
s10, judging whether a zero correction button is pressed, if so, entering S11; if not, entering S12;
s11, resetting a motor encoder and a blade encoder;
s12, judging whether a manual signal is received or not, if not, exiting the manual mode; if yes, jump to S1.
As optimization, the trigger signals further comprise an emergency stop trigger signal, an automatic mode entering trigger signal and an interface debugging trigger signal.
The beneficial effects of the invention are as follows:
1. the invention can reduce the occupation of the I/O port of the driver through the signal conversion module.
2. The method has simple structure and brings the manual operation switches together, thereby being convenient for operators to operate.
3. The selection of the operation switch of the invention meets the design requirement.
Drawings
FIG. 1 is a schematic diagram of the circuit connections of a manual operation module of a pitch control system according to the present invention;
FIG. 2 is an assembly view of a manual operation module of the pitch control system of the present invention;
FIG. 3 is a flow chart of a manual mode control method of the pitch control system of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
A variable pitch control system comprises 3 variable pitch control cabinets, and each variable pitch control cabinet is provided with a manual operation module. The variable pitch control cabinet in the embodiment is a No. 1 control cabinet. (No. 2 and No. 3 pitch control cabinets do not have a pitch control cabinet lighting lamp switch 3S1, but 3S1 can be designed in No. 2 or No. 3 according to the user' S needs)
As shown in FIG. 1, a manual operation module of a pitch control system comprises a driver, a signal conversion module, 4 regulating switches, a manual/automatic switch and an illumination lamp switch, wherein the illumination lamp switch is arranged on a serial link of illumination lamps of three pitch control cabinets, and the illumination lamp switch is connected in series on a No. 1 control cabinet of three cabinet illumination lamp power supply lines, and can control the switching of three illumination lamps only through the illumination lamp switch in the manual operation module.
Because of the safety of the pitch control system, a pair of contact switches of limit switch relays of two other cabinets are connected in series in a manual circuit by using a manual interlocking circuit, and the manual mode can be only entered when the automatic/manual switch is rotated to be manual and two other blades are in safe positions. Manual operation is only possible in manual mode with the pitch position between 0 ° and 91 °. The manual interlock circuit is referred to in patent number CN 202022365415.2.
The 4 regulating switches are respectively connected with the driver through the signal conversion module, one end of the manual/automatic switch is connected with the driver, and the other end of the manual/automatic switch is connected with the driver through a limit switch connected with the other two variable-pitch control cabinets in series.
In this embodiment, the 4 adjusting switches include:
zero-correction switch: adopting a button switch, and pressing down zero correction switch software to clear the position of the motor encoder and the position of the blade encoder simultaneously after the position of the blade and the position of the motor encoder reach mechanical zero points;
reset/bypass switch: the three-position self-resetting switch is adopted, the resetting switch resets a fault signal which is reported by the variable pitch control system, and the bypass switch is used for continuing the variable pitch when the variable pitch control system is in an automatic mode and the blade rotates to a safe angle of the limit switch; the safety angle of the limit switch is assumed to be 96 degrees, emergency feathering is generally carried out when faults are encountered, the emergency feathering can be turned to 96 degrees in the feathering process, and therefore the limit switch is encountered, at the moment, manual pitching can be continued only by manually rotating the bypass/reset switch to the bypass, and otherwise, the operation cannot be carried out;
fast/slow switch: setting the rotation speed of the blade by adopting a three-position self-resetting selection switch; the switch will perform the relevant operation only when it is rotated fast/slow, and will reset to the neutral position after no rotation.
Forward/reverse switch: the self-locking selector switch is adopted, the forward direction is the direction of 90 degrees for changing the pitch, and the backward direction is the direction of 0 degrees for changing the pitch.
In the system, the priority level of the forced manual mode is higher than that of the manual mode, in the manual operation connection diagram of fig. 1, a key switch can be connected in parallel beside a 15K1 serial circuit of a No. 2 cabinet and a 15K1 serial circuit of a No. 3 cabinet in parallel, and the forced manual interlocking function is canceled, but the key switch must be closed under special conditions for safety.
In this embodiment, an input end of the signal conversion module is provided with a Ref port, a Res port, a Bypass port, a Fast port, a low port and a forward port, the Ref port is connected with a zero calibration switch, the Res port is connected with a reset end of a reset/Bypass switch, the Bypass port is connected with a Bypass end of the reset/Bypass switch, the Fast port is connected with a Fast end of a Fast/Slow switch, the Slow port is connected with a Slow end of the Fast/Slow switch, the forward port is connected with a forward/backward switch, when the forward/backward switch is turned off, a direction of a blade is forward, and when the forward/backward switch is turned off, the direction of the blade is backward; the output of signal conversion module is equipped with 5V power supply end (signal conversion module ' S5V port), serial ports A (signal conversion module ' S A port), serial ports B (signal conversion module ' S B port) and earthing terminal (signal conversion module ' S GND), 5V power supply end is connected with the 5Vout port of driver, serial ports A is connected with the RS485+ port of driver, serial ports B is connected with the RS 485-port of driver, earthing terminal GND, switch 1S1, 2S1, 4S1, 5S1, 6S1 ' S one of them contact is connected with the EGND port of driver.
In this embodiment, one end of the manual/automatic switch is connected to a manual control interface of the driver, i.e. a manual interface, and the other end is connected to an EGN of an EGND/signal conversion module of an RS485 serial port of the driver, and the safety interlock of the pitch control system is introduced in the manner that the contacts of the limit switch relays of the pitch control cabinets No. 2 and No. 3 are connected in series through a heavy-load connector in the middle, i.e. only when the other two cabinets are in a safe position, the manual operation can be performed, and if any one of the other two cabinets is not in a safe position, the manual operation cannot be performed even if the manual/automatic switch is placed in the manual position.
Specifically, two key switches are arranged at two ends of a serial circuit of limit switches 15K1 of the other two variable-pitch control cabinets in parallel, and the key switches are used for canceling the manual interlocking function of the two variable-pitch control cabinets. The key switch needs to be held by specific personnel and cannot be easily used by other people, the key switch is designed to facilitate debugging when the pitch control system is hoisted, and the key switch cannot be easily used for system safety after hoisting. The two pairs of contacts of the variable-pitch control cabinet are also respectively connected in series in manual circuits of the other two variable-pitch control cabinets, and the structure in a variable-pitch system safety interlocking device is specifically referred to as CN 202022365415.2. As shown in fig. 1, the pair of contacts 21-22-24 of the relay 15K1 representing the cabinet No. 2 limit switch safety position feedback and the pair of contacts 11-12-14 of the relay 15K1 representing the cabinet No. 3 limit switch safety position feedback are connected in series in the manual operation system circuit, wherein the 24 contact of the cabinet No. 2 15K1 is connected in series with the 14 contact of the cabinet No. 3 15K1, and when the cabinet No. 2 limit switch and the cabinet No. 3 limit switch are triggered (when the cabinet No. 2 and the cabinet No. 3 are in the safety position), the 15K1 of the cabinet No. 2 and the 15K1 of the cabinet No. 3 are in the closed state (the 21 contact and the 24 contact are in contact, the 11 contact and the 14 contact are in contact), that is, the manual mode is only valid when the manual/automatic knob is placed in the manual position at this time, that is, the "one pitch system safety interlock device" is valid only when the other two paddles are in the safety position.
The manual operation module of the pitch control system can convert switching signals of various pitch systems into RS485 signals and transmit the RS485 signals to the driver, and the manual operation module can collect switching signals used by the pitch control system together and is installed on the control cabinet body in a mode of punching holes in the wall of the pitch control cabinet. The module can facilitate the operation of users, considers the operation safety through the control of internal software, and does not occupy the signal interface of the pitch drive.
The manual operation module of the pitch control system is structurally embedded in the cabinet wall in a manual operation box mode, the arrangement mode of the internal and external switches of the cabinet after the manual operation module is embedded in the cabinet wall of the cabinet body is shown in fig. 2, and the manual operation mode and the button operation flow of the pitch control system are shown in fig. 3.
The invention also discloses a control method of the manual operation module of the pitch control system, the pitch control system receives a trigger signal and enters a corresponding mode, the trigger signal comprises a manual signal, and the control method after receiving the manual signal is as follows:
s1, entering a manual operation mode;
s2, judging whether the blade position is 0-91 degrees, if so, entering S3, and if not, entering S8;
s3, selecting the running direction of the blade;
s4, selecting the running speed of the blade;
s5, judging whether a reset signal is received, if so, entering S6; if not, entering S8;
s6, judging whether the duration of the reset signal is less than 6S, if so, entering S7; if not, entering a forced manual mode;
s7, resetting the pitch failure;
s8, judging whether a limit switch is triggered by the pitch control system, if so, entering S9, and if not, entering S10;
s9, triggering a bypass button, and releasing after leaving the limit switch;
s10, whether a zero button is pressed or not, if yes, entering S11; if not, entering S12;
s11, resetting a motor encoder and a blade encoder;
s12, judging whether a manual signal is received or not, if not, exiting the manual mode; if yes, jump to S1.
In this embodiment, the trigger signal further includes an scram trigger signal, an enter automatic mode trigger signal, and an interface debug trigger signal.
When the limit switch is triggered in the operation process, the bypass button is triggered, and after the bypass button is separated from the limit switch, the bypass button is loosened and the limit switch is moved to the position of the limit switch. Through the paddle position of slow adjustment, when the paddle position is to mechanical zero point position back, press the reference button, motor encoder and paddle encoder clear simultaneously.
The optimal installation mode in the invention is to directly install the switch on the cabinet wall, and the switch positions are arranged according to the sequence of operation, and the first row is as follows: manual/automatic switch, forward/reverse switch, fast/slow switch, second row: zero-check switch, reset/bypass switch, light switch, since the light switch has only 1 cabinet, which is put at the end. The power line and the ground line of the illuminating lamp and the interlocking part of the automatic/manual selection switch are routed to walk the line through the heavy-load connecting cable between the cabinets. The driver interface is an interface matched with the manual box module so as to convert the multi-path switch signals into serial signals and transmit the serial signals to the driver.
Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (3)
1. The manual operation module of the pitch control system is characterized by comprising a driver, a signal conversion module, 4 regulating switches, a manual/automatic switch and an illumination lamp switch, wherein the illumination lamp switch is arranged on a serial link of illumination lamps of three pitch control cabinets, the three pitch control cabinets comprise a No. 1 pitch control cabinet, a No. 2 pitch control cabinet and a No. 3 pitch control cabinet, the 4 regulating switches are respectively connected with the driver through the signal conversion module, one end of the manual/automatic switch is connected with the driver, and the other end of the manual/automatic switch is connected with the driver through a limit switch of the No. 2 pitch control cabinet and the No. 3 pitch control cabinet which are connected in series;
the 4 regulating switches comprise:
zero-correction switch: adopting a button switch to clear the position of the motor encoder and the position of the blade encoder simultaneously;
reset/bypass switch: the three-position self-resetting switch is adopted, the resetting switch resets a fault signal which is reported by the variable pitch control system, the bypass switch is a safe angle of the limit switch when the variable pitch control system is in a manual mode, and the manual variable pitch operation can be continued by using the bypass switch;
fast/slow switch: setting the rotation speed of the blade by adopting a three-position self-resetting selection switch;
forward/reverse switch: a self-locking selection switch is adopted, the forward direction is the direction of 90 degrees for changing the pitch, and the backward direction is the direction of 0 degrees for changing the pitch;
the input end of the signal conversion module is provided with a Ref port, a Res port, a Bypass port, a Fast port, a low port and a forward port, the Ref port is connected with a zero correction switch, the Res port is connected with a reset end of a reset/Bypass switch, the Bypass port is connected with a Bypass end of the reset/Bypass switch, the Fast port is connected with a Fast end of a Fast/Slow switch, the low port is connected with a Slow end of the Fast/Slow switch, the forward port is connected with a forward/backward switch, when the forward/backward switch is turned off, the direction of a blade is forward, and when the forward/backward switch is turned off, the direction of the blade is backward; the output end of the signal conversion module is provided with a 5V power supply end, a serial port A, a serial port B and a grounding end GND, the 5V power supply end is connected with a 5Vout port of the driver, the serial port A is connected with an RS485+ port of the driver, the serial port B is connected with an RS 485-port of the driver, and one contact of the grounding end GND, a zero calibration switch, a reset/bypass switch, a fast/slow switch, a forward/backward switch and a manual/automatic switch is connected with an EGND port of the driver;
the manual/automatic switch adopts a two-position self-locking switch and is used for selecting the operation mode of the pitch control system, one end of the manual/automatic switch is connected with a manual control port of a driver, the other end of the manual/automatic switch is connected with an EGND port of the driver and an EGN port of the signal conversion module, and contacts of limit switches of a pitch control cabinet No. 2 and No. 3 are connected in series through a heavy-load connector in the middle;
two ends of a serial circuit of limit switches of the other two variable-pitch control cabinets are connected in parallel with a key switch, and the key switch is used for canceling the manual interlocking function of the two variable-pitch control cabinets.
2. A control method for a manual operation module of a pitch control system according to claim 1, wherein the pitch control system receives a trigger signal and enters a corresponding mode, and the control method after receiving the manual signal is as follows:
s1, entering a manual operation mode;
s2, judging whether the blade position is 0-91 degrees, if so, entering S3, and if not, entering S8;
s3, selecting the running direction of the blade;
s4, selecting the running speed of the blade;
s5, judging whether a reset signal is received, if so, entering S6; if not, entering S8;
s6, judging whether the duration of the reset signal is less than 6S, if so, entering S7; if not, entering a forced manual mode;
s7, resetting the pitch failure;
s8, judging whether to trigger a limit switch of the pitch control system, if so, entering S9, and if not, entering S10;
s9, triggering a bypass button, and releasing after leaving the limit switch;
s10, judging whether a zero correction button is pressed, if so, entering S11; if not, entering S12;
s11, resetting a motor encoder and a blade encoder;
s12, judging whether a manual signal is received or not, if not, exiting the manual mode; if yes, jump to S1.
3. The method according to claim 2, wherein the trigger signal further comprises an scram trigger signal, an enter automatic mode trigger signal, and an interface debug trigger signal.
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| CN202111130225.5A CN113833602B (en) | 2021-09-26 | 2021-09-26 | Manual operation module of variable pitch control system and control method thereof |
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| CN109058037A (en) * | 2018-08-02 | 2018-12-21 | 固安华电天仁控制设备有限公司 | A kind of variable blade control system of power generation with marine energy unit |
| CN213270131U (en) * | 2020-10-22 | 2021-05-25 | 重庆华昭电气设备有限公司 | Become oar system safety interlock |
| CN113007014A (en) * | 2021-03-16 | 2021-06-22 | 东方电气自动控制工程有限公司 | Control method of variable pitch control system |
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Effective date of registration: 20240615 Address after: 401133 No. 31 Changhe Road, Yuzui Town, Jiangbei District, Chongqing Patentee after: CHONGQING HUAYU HEAVY INDUSTRY ELECTROMECHANICAL Co.,Ltd. Country or region after: China Address before: 401133 No. 31 Changhe Road, Yuzui Town, Jiangbei District, Chongqing Patentee before: CHONGQING HUAZHAO ELECTRIC EQUIPMENT Co.,Ltd. Country or region before: China |