CN212627740U - Control circuit of fluidization fan - Google Patents
Control circuit of fluidization fan Download PDFInfo
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- CN212627740U CN212627740U CN202021410026.0U CN202021410026U CN212627740U CN 212627740 U CN212627740 U CN 212627740U CN 202021410026 U CN202021410026 U CN 202021410026U CN 212627740 U CN212627740 U CN 212627740U
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Abstract
The application relates to the field of fans, in particular to a control circuit of a fluidized fan. This application three-phase power cord and three-phase machine, be equipped with converter supply circuit on the three-phase power cord, converter supply circuit includes frequency conversion element, the main switch, first switch and second switch, the three-phase power cord is connected with frequency conversion element's input contact through the main switch, frequency conversion element's output contact is connected with the main contact of first switch, the main contact of first switch is connected with the winding of three-phase machine all the way, another way of main contact of first switch is connected with the main contact of second switch, the main contact of second switch is connected with the winding of three-phase machine, frequency conversion equipment is add in this application, become the soft start with the starting mode of fluidization fan, eliminate overload impulse current, it is smooth to make three-phase machine start overall process, reduce the influence to the operation of fluidization fan.
Description
Technical Field
The application relates to the field of fans, in particular to a control circuit of a fluidized fan.
Background
In a conventional thermal power plant, a steam system is required to compress and transport gas, which involves the use of a fluidizing fan.
The fluidizing fan is a constant volume Roots fan, and has the principle that two blade-shaped rotors move relatively in a cylinder to compress and convey gas, simple structure and convenient manufacture.
However, when the fluidized fan is started, the instantaneous current is large, an impact circuit is generated, and the operation of the fluidized fan is influenced.
SUMMERY OF THE UTILITY MODEL
The starting mode of the three-phase motor of the fluidized fan is changed into star-triangle starting, the starting current of the three-phase motor is reduced, meanwhile, the frequency conversion equipment is additionally arranged, the starting mode of the fluidized fan is changed into soft starting, overload impact current is eliminated, the whole starting process of the three-phase motor is smooth, and the influence on the operation of the fluidized fan is reduced.
The application provides a fluidization fan control circuit adopts following technical scheme:
the utility model provides a fluidization fan control circuit, includes three-phase power line and three-phase motor, be equipped with converter supply circuit on the three-phase power line, converter supply circuit includes frequency conversion component, main switch, first switch and second switch, the three-phase power line is connected with frequency conversion component's input contact through main switch, frequency conversion component's output contact and the main contact of first switch are connected, the main contact of first switch is connected with three-phase motor's winding all the way, another way of main contact of first switch is connected with the main contact of second switch, the main contact of second switch is connected with three-phase motor's winding.
Through adopting above-mentioned technical scheme, when carrying out the start-up of three phase machine, closed main switch, first switch and second switch, make frequency conversion component switch on under the power supply of three-phase power cord, realize frequency conversion component to three phase machine's control, make three phase machine's starting mode become soft start, eliminate overload impulse current, make three phase machine start-up overall process smooth, reduce the production of impact torque, reduce the influence to the operation of fluidization fan, when the staff need change three phase machine's rotational speed, when changing the output amount of wind of fluidization fan promptly, the output frequency of adjustment frequency conversion component can.
Preferably, a star-delta power supply circuit is further arranged on the three-phase power line and used for serving as a standby power supply loop for the three-phase motor.
By adopting the technical scheme, when the power supply circuit of the frequency converter breaks down, the star-delta power supply circuit is used, standby power supply of the three-phase motor is realized, meanwhile, the starting current of the three-phase motor is reduced, and the effect of protecting the three-phase motor is achieved.
Preferably, star triangle supply circuit includes auxiliary switch, main contactor, thermorelay, operation contactor and start contactor, the three-phase power cord is connected with the main contact of main contactor through auxiliary switch, the main contact of main contactor is connected with thermorelay all the way, thermorelay is connected with three-phase machine's winding, another way of main contact of main contactor is connected with the main contact of operation contactor, the main contact of operation contactor constitutes the triangle-shaped with three-phase machine's winding and is connected, three-phase machine's winding and the main contact of start contactor are connected, start contactor constitutes the star type with three-phase machine's winding and is connected.
By adopting the technical scheme, when the three-phase motor is started, the auxiliary switch, the main contactor and the starting contactor are closed, the three-phase motor is started in a star shape, after a period of time is delayed, the starting contactor is disconnected, the operating contactor is closed, and the three-phase motor operates in a triangular shape. The star-delta starting belongs to step-down starting, and because the starting current of the three-phase motor is in direct proportion to the power voltage, and the starting current provided by the power grid is only 1/3 of the full-voltage starting current, the starting torque of the three-phase motor is also only 1/3 of the full-voltage starting torque, and the starting torque is realized by reducing the starting current at the expense of power.
Preferably, the star-delta power supply circuit further comprises a star-delta control circuit for controlling the switching of the star-delta connection.
By adopting the technical scheme, the star-delta control circuit is used for controlling the operation of the star-delta power supply circuit, the function of switching the three-phase motor from star connection to delta connection is realized, the time is controlled, and the proper switching time is determined.
Preferably, the star-delta control circuit comprises a live wire, a zero line, a stop button, a start button, a standby button, a time relay normally closed contact, a time relay normally open contact, a main contactor first normally open contact, a main contactor second normally open contact, a main contactor coil, a start contactor normally closed contact, a start contactor coil, a running contactor normally closed contact and a running contactor coil, wherein the live wire is connected with the stop button, the stop button is connected with the start button in series, the start button is connected with the main contactor coil, the main contactor coil is connected with the zero line, the normally open contact of the main contactor is connected with the start button in parallel, the start button is connected with the standby button in parallel, the standby button is connected with the time relay normally closed contact, and the time relay normally closed contact is connected with the start contactor coil, the starting contactor coil is connected with the normally closed contact of the operating contactor, the normally closed contact of the operating contactor is connected with a zero line, the live wire is connected with the second normally open contact of the main contactor, the second normally open contact of the main contactor is connected with the time relay, the time relay is connected with the zero line, the live wire is connected with the normally open contact of the time relay, the normally open contact of the time relay is connected with the operating contactor coil, the operating contactor coil is connected with the normally closed contact of the starting contactor, and the normally closed contact of the starting contactor is connected with the zero line.
By adopting the technical scheme, when the three-phase motor is started through the star-delta control circuit, the start button is pressed to conduct the coil of the main contactor, so that the main contact of the main contactor is attracted, the first normally open contact of the main contactor is attracted, the main contactor is self-locked, and the continuous closing of the main contactor is realized;
at the moment, the normally closed contact of the time relay is in a closed state, the normally closed contact of the operating contactor is also in a closed state, and a coil of the starting contactor is conducted to be electrified, so that the three-phase motor is started in a star connection manner;
meanwhile, a second normally open contact of the main contactor is closed, and the time relay is conducted to start timing;
the normally closed contact of the starting contactor is opened, so that a loop where a coil of the operating contactor is located is disconnected and cannot be conducted, and the interlocking function that the operating contactor cannot be electrically conducted when the starting contactor works is realized;
when the time relay reaches the preset time, the normally closed contact of the time relay is opened, and the coil of the starting contactor loses power;
the normally open contact of the time relay is closed, the normally closed contact of the starting contactor is closed, and the coil of the operating contactor is electrified and conducted, so that the three-phase motor is in triangular connection and continuously operates;
and the normally closed contact of the operating contactor is opened, so that the coil of the starting contactor is powered off and cannot be conducted, and the interlocking function that the starting contactor cannot be powered on and conducted when the operating contactor works is realized.
Preferably, a fuse is connected between the live wire and the stop button.
Through adopting above-mentioned technical scheme, when the electric current exceeded the specified value, fuse self can produce the heat to make the fuse-element fusing, thereby disconnect whole control circuit, realize the protection to electric elements.
Preferably, a first frequency converter interlocking point is connected between the fuse and the stop button.
By adopting the technical scheme, the arrangement of the first frequency converter interlocking point ensures that the star-delta control circuit can not be accessed to form interference when the star-delta power supply circuit is controlled, the condition that two paths of power supply sources simultaneously appear in the three-phase motor is reduced, and the safety is improved.
Preferably, a DCS control system is connected in parallel to the stop button and the start button.
By adopting the technical scheme, the remote control of the star-delta control circuit is realized by the arrangement of the DCS control system, the danger coefficient of local manual operation is reduced, and the practicability in actual life and production is improved.
Preferably, a second frequency converter linkage point is connected between the fuse and the DCS control system.
By adopting the technical scheme, the arrangement of the second frequency converter linkage point ensures that the star-delta control circuit can not be accessed to form interference when the star-delta power supply circuit is controlled, the condition that two paths of power supply sources simultaneously appear in the three-phase motor is reduced, and the safety is improved.
Preferably, an indicator light is connected in parallel to the main contactor coil.
Through adopting above-mentioned technical scheme, the pilot lamp that connects in parallel and set up when main contactor coil is electrified, realizes indicating function, reduces the condition of live-line operation and takes place.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the three-phase motor is started, the main switch, the first switch and the second switch are closed, so that the frequency conversion element is conducted under the power supply of a three-phase power line, the control of the frequency conversion element on the three-phase motor is realized, the starting mode of the three-phase motor is changed into soft starting, the overload impact current is eliminated, the whole starting process of the three-phase motor is smooth, the generation of impact torque is reduced, the influence on the running of the fluidized fan is reduced, and when a worker needs to change the rotating speed of the three-phase motor, namely the output air volume of the fluidized fan, the output frequency of the frequency conversion element is adjusted;
2. when the power supply circuit of the frequency converter fails, the star-delta power supply circuit is used for realizing standby power supply of the three-phase motor, and simultaneously, the starting current of the three-phase motor is reduced, so that the three-phase motor is protected;
3. the star-delta control circuit is used for controlling the operation of the star-delta power supply circuit, realizing the function of switching the three-phase motor from star connection to delta connection, simultaneously realizing the control of time and determining proper switching time.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a power supply circuit of a frequency converter in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a star-delta power supply circuit in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a star-delta control circuit in the embodiment of the present application.
Description of reference numerals: 1. a three-phase power line; 2. a three-phase motor; 3. a frequency converter power supply circuit; 4. a star-delta power supply circuit; 5. a frequency conversion element; 6. a main switch; 7. a first switch; 8. a second switch; 9. an auxiliary switch; 10. a main contactor; 11. a thermal relay; 12. operating the contactor; 13. starting the contactor; 14. a star-delta control circuit; 15. a live line; 16. a zero line; 17. a stop button; 18. a start button; 19. a standby button; 20. a time relay; 21. a time relay normally closed contact; 22. a time relay normally open contact; 23. a first normally open contact of the main contactor; 24. a second normally open contact of the main contactor; 25. a main contactor coil; 26. starting a normally closed contact of the contactor; 27. starting a contactor coil; 28. operating a normally closed contact of the contactor; 29. operating the contactor coil; 30. a fuse; 31. a first frequency converter linkage point; 32. a DCS control system; 33. a second frequency converter linkage point; 34. and an indicator light.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a control circuit of a fluidized fan.
As shown in fig. 1, a control circuit of a fluidized fan includes a three-phase power line 1 and a three-phase motor 2. The three-phase motor 2 is used for driving blades of the fluidization fan. And a frequency converter power supply circuit 3 and a star-delta power supply circuit 4 are arranged on the three-phase power line 1. The frequency converter power supply circuit 3 is used for normal power supply of the three-phase motor 2, and the star-delta power supply circuit 4 is used for serving as a standby power supply loop for the three-phase motor 2.
As shown in fig. 1 and 2, the frequency converter supply circuit 3 comprises a frequency conversion element 5, a main switch 6, a first switch 7 and a second switch 8. The frequency conversion element 5 is an existing frequency converter device and comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detection unit micro-processing unit and the like.
The three-phase power line 1 is connected with an input contact of a frequency conversion element 5 through a main switch 6, an output contact of the frequency conversion element 5 is connected with a main contact of a first switch 7, one path of the main contact of the first switch 7 is connected with a winding of the three-phase motor 2, the other path of the main contact of the first switch 7 is connected with a main contact of a second switch 8, and the main contact of the second switch 8 is connected with the winding of the three-phase motor 2.
When the three-phase motor 2 is started, the main switch 6, the first switch 7 and the second switch 8 are closed, so that the frequency conversion element 5 is conducted under the power supply of the three-phase power line 1, and the control of the frequency conversion element 5 on the three-phase motor 2 is realized. The starting mode of the three-phase motor 2 is changed into soft starting, overload impact current is eliminated, the whole starting process of the three-phase motor 2 is smooth, impact torque is reduced, and the influence on the running of the fluidization fan is reduced. When the staff need change three-phase motor 2's rotational speed, when changing the output amount of wind of fluidization fan promptly, the output frequency of adjustment frequency conversion component 5 can accomplish accurate regulation.
When the converter power supply circuit 3 breaks down, the star-delta power supply circuit 4 is used to realize standby power supply for the three-phase motor 2, so that the starting current of the three-phase motor 2 can be reduced, and the effect of protecting the three-phase motor 2 is achieved.
As shown in fig. 1 and 3, the star-delta power supply circuit 4 includes an auxiliary switch 9, a main contactor 10, a thermal relay 11, a running contactor 12, and a starting contactor 13.
The three-phase power line 1 is connected with a main contact of a main contactor 10 through an auxiliary switch 9, one path of the main contact of the main contactor 10 is connected with a thermal relay 11, the thermal relay 11 is connected with a winding of the three-phase motor 2, the other path of the main contact of the main contactor 10 is connected with a main contact of an operation contactor 12, the main contact of the operation contactor 12 and the winding of the three-phase motor 2 form a triangular connection, the winding of the three-phase motor 2 is connected with a main contact of a starting contactor 13, and the starting contactor 13 and the winding of the three-phase motor 2 form a star connection.
When the three-phase motor 2 is started, the auxiliary switch 9, the main contactor 10 and the starting contactor 13 are closed, the three-phase motor 2 is started in a star shape, after a period of time, the starting contactor 13 is disconnected, the running contactor 12 is closed, and the three-phase motor 2 operates in a triangular shape.
The star-delta starting belongs to step-down starting, and because the starting current of the three-phase motor 2 is in direct proportion to the voltage of the three-phase power line 1, and the starting current provided by the three-phase power line 1 is only the full-voltage starting current/, the starting torque of the three-phase motor 2 is only the full-voltage starting torque/, and the starting torque is realized by replacing the reduced starting current at the expense of power.
As shown in fig. 1 and 4, the star-delta power supply circuit 4 further includes a star-delta control circuit 14, and the star-delta control circuit 14 is configured to control star-delta connection switching of the star-delta power supply circuit 4.
The star-delta control circuit 14 comprises a live wire 15, a zero wire 16, a stop button 17, a start button 18, a standby button 19, a time relay 20, a time relay normally-closed contact 21, a time relay normally-open contact 22, a main contactor first normally-open contact 23, a main contactor second normally-open contact 24, a main contactor coil 25, a starting contactor normally-closed contact 26, a starting contactor coil 27, a running contactor normally-closed contact 28 and a running contactor coil 29.
The live wire 15 is connected with the stop button 17, the stop button 17 is connected with the start button 18 in series, the start button 18 is connected with the main contactor coil 25, the main contactor coil 25 is connected with the zero line 16, the first normally open contact 23 of the main contactor is connected with the start button 18 in parallel, the start button 18 is connected with the standby button 19 in parallel, the standby button 19 is connected with the time relay normally closed contact 21, the time relay normally closed contact 21 is connected with the start contactor coil 27, the start contactor coil 27 is connected with the operation contactor normally closed contact 28, the operation contactor normally closed contact 28 is connected with the zero line 16, the live wire 15 is connected with the second normally open contact 24 of the main contactor, the second normally open contact 24 of the main contactor is connected with the time relay 20, the time relay 20 is connected with the zero line 16, the live wire 15 is connected with the time relay normally open contact 22, and the time relay normally open, the run contactor coil 29 is connected to the start contactor normally closed contact 26, and the start contactor normally closed contact 26 is connected to the neutral wire 16.
As shown in fig. 3 and 4, when the three-phase motor 2 is started through the star-delta control circuit 14, the start button 18 is pressed to turn on the main contactor coil 25, so that the main contact of the main contactor 10 is attracted, the first normally open contact 23 of the main contactor is attracted, the main contactor 10 is self-locked, and the main contactor 10 is continuously closed;
at this time, the time relay normally closed contact 21 is in a closed state, the operation contactor normally closed contact 28 is also in a closed state, and the starting contactor coil 27 is conducted to be electrified, so that the three-phase motor 2 is started through star connection;
meanwhile, the second normally open contact 24 of the main contactor is closed, and the time relay 20 is switched on to start timing;
the normally closed contact 26 of the starting contactor is opened, so that a loop where the coil 29 of the operating contactor is located is disconnected and cannot be conducted, and the interlocking function that the operating contactor 12 cannot be electrically conducted when the starting contactor 13 works is realized;
when the time relay 20 reaches the preset time, the normally closed contact 21 of the time relay is opened, and the starting contactor coil 27 loses power;
the time relay normally open contact 22 is closed, the starting contactor normally closed contact 26 is closed, and the operation contactor coil 29 is electrified and conducted, so that the three-phase motor 2 is in triangular connection and continuously operates;
and the normally closed contact 28 of the running contactor is opened, so that the coil 27 of the starting contactor is de-energized and cannot be conducted, and the interlocking function that the starting contactor 13 cannot be energized and conducted when the running contactor 12 works is realized.
As shown in fig. 4, a fuse 30 is connected in series between the live wire 15 and the stop button 17. When the current exceeds a prescribed value, the fuse 30 itself generates heat to fuse the melt, thereby disconnecting the entire control circuit and realizing protection of the electrical element.
A first frequency converter interlocking point 31 is connected between the fuse 30 and the stop button 17, so that when the star-delta control circuit 14 controls the star-delta power supply circuit 4, the frequency converter power supply circuit 3 cannot be connected to form interference, the occurrence of the situation that two paths of power supply sources simultaneously appear in the three-phase motor 2 is reduced, and the safety is improved.
A DCS control system 32 is connected in parallel to the stop button 17 and the start button 18. The DCS control system 32 is used for realizing the remote control of the star-delta control circuit 14, reducing the risk coefficient of local manual operation and improving the practicability in actual life and production.
As shown in fig. 4, a second inverter linkage point 33 is connected in series between the fuse 30 and the DCS control system 32. The second frequency converter linkage point 33 enables the star-delta control circuit 14 to control the star-delta power supply circuit 4, the frequency converter power supply circuit 3 cannot be connected to form interference, the occurrence of the situation that two paths of power supply sources exist at the same time in the three-phase motor 2 is reduced, and the safety is improved.
The indicating lamp 34 is connected to the main contactor coil 25 in parallel, when the main contactor coil 25 is electrified, an indicating function is achieved, and the situation of electrified operation is reduced.
The implementation principle is as follows:
when the three-phase motor 2 is started, the main switch 6, the first switch 7 and the second switch 8 are closed, so that the frequency conversion element 5 is conducted under the power supply of the three-phase power line 1, and the control of the frequency conversion element 5 on the three-phase motor 2 is realized. The starting mode of the three-phase motor 2 is changed into soft starting, overload impact current is eliminated, the whole starting process of the three-phase motor 2 is smooth, impact torque is reduced, and the influence on the running of the fluidization fan is reduced. When the staff need change three-phase motor 2's rotational speed, when changing the output amount of wind of fluidization fan promptly, the output frequency of adjustment frequency conversion component 5 can accomplish accurate regulation.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A fluidization fan control circuit is characterized in that: including three-phase power cord (1) and three-phase motor (2), be equipped with converter supply circuit (3) on three-phase power cord (1), converter supply circuit (3) include frequency conversion component (5), main switch (6), first switch (7) and second switch (8), three-phase power cord (1) is connected with the input contact of frequency conversion component (5) through main switch (6), the output contact of frequency conversion component (5) is connected with the main contact of first switch (7), the main contact of first switch (7) is connected with the winding of three-phase motor (2) all the way, the main contact way of first switch (7) is connected with the main contact of second switch (8), the main contact of second switch (8) is connected with the winding of another three-phase motor (2).
2. The fluidization fan control circuit of claim 1, wherein: and the three-phase power line (1) is also provided with a star-delta power supply circuit (4) which is used for serving as a standby power supply loop for the three-phase motor (2).
3. The fluidization fan control circuit of claim 2, wherein: the star-delta power supply circuit (4) comprises an auxiliary switch (9), a main contactor (10), a thermal relay (11), an operation contactor (12) and a starting contactor (13), the three-phase power line (1) is connected with a main contact of a main contactor (10) through an auxiliary switch (9), one path of a main contact of the main contactor (10) is connected with a thermal relay (11), the thermal relay (11) is connected with a winding of the three-phase motor (2), the other path of the main contact of the main contactor (10) is connected with the main contact of the operating contactor (12), the main contact of the running contactor (12) and the winding of the three-phase motor (2) form a triangular connection, the winding of the three-phase motor (2) is connected with the main contact of the starting contactor (13), the starting contactor (13) and a winding of the three-phase motor (2) form star connection.
4. The fluidization fan control circuit of claim 3, wherein: the star-delta power supply circuit (4) further comprises a star-delta control circuit (14) for controlling the star-delta connection switching.
5. The fluidization fan control circuit of claim 4, wherein: the star-delta control circuit (14) comprises a live wire (15), a zero line (16), a stop button (17), a start button (18), a standby button (19), a time relay (20), a time relay normally closed contact (21), a time relay normally open contact (22), a main contactor first normally open contact (23), a main contactor second normally open contact (24), a main contactor coil (25), a start contactor normally closed contact (26), a start contactor coil (27), an operation contactor normally closed contact (28) and an operation contactor coil (29), wherein the live wire (15) is connected with the stop button (17), the stop button (17) is connected with the start button (18) in series, the start button (18) is connected with the main contactor coil (25), the main contactor coil (25) is connected with the zero line (16), the main contactor first normally open contact (23) is connected with the start button (18) in parallel, start button (18) and standby button (19) parallel connection, standby button (19) are connected with time relay normally closed contact (21), time relay normally closed contact (21) link to each other with starting contactor coil (27), starting contactor coil (27) are connected with operation contactor normally closed contact (28), operation contactor normally closed contact (28) are connected with zero line (16), live wire (15) are connected with main contactor second normally open contact (24), main contactor second normally open contact (24) are connected with time relay (20), time relay (20) are connected with zero line (16), live wire (15) are connected with time relay normally open contact (22), time relay normally open contact (22) are connected with operation contactor coil (29), operation contactor coil (29) are connected with starting contactor normally closed contact (26), the normally closed contact (26) of the starting contactor is connected with a zero line (16).
6. The fluidization fan control circuit of claim 5, wherein: and a fuse (30) is connected between the live wire (15) and the stop button (17).
7. The fluidization fan control circuit of claim 6, wherein: and a first frequency converter interlocking point (31) is connected between the fuse (30) and the stop button (17).
8. The fluidization fan control circuit of claim 6, wherein: and the stop button (17) and the start button (18) are connected with a DCS control system (32) in parallel.
9. The fluidization fan control circuit of claim 8, wherein: and a second frequency converter linkage point (33) is connected between the fuse (30) and the DCS control system (32).
10. The fluidization fan control circuit of claim 5, wherein: and an indicator lamp (34) is connected in parallel to the main contactor coil (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021410026.0U CN212627740U (en) | 2020-07-16 | 2020-07-16 | Control circuit of fluidization fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021410026.0U CN212627740U (en) | 2020-07-16 | 2020-07-16 | Control circuit of fluidization fan |
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| Publication Number | Publication Date |
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| CN212627740U true CN212627740U (en) | 2021-02-26 |
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| CN202021410026.0U Active CN212627740U (en) | 2020-07-16 | 2020-07-16 | Control circuit of fluidization fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953310A (en) * | 2021-04-14 | 2021-06-11 | 河南金马信捷电气科技有限公司 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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2020
- 2020-07-16 CN CN202021410026.0U patent/CN212627740U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953310A (en) * | 2021-04-14 | 2021-06-11 | 河南金马信捷电气科技有限公司 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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