CN114289168A - Depolymerizing machine system and starting method thereof - Google Patents
Depolymerizing machine system and starting method thereof Download PDFInfo
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- CN114289168A CN114289168A CN202111631646.6A CN202111631646A CN114289168A CN 114289168 A CN114289168 A CN 114289168A CN 202111631646 A CN202111631646 A CN 202111631646A CN 114289168 A CN114289168 A CN 114289168A
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Abstract
The invention discloses a starting method of a depolymerizer system, which is characterized in that a frequency converter is connected with a depolymerizer to realize the speed increase of the depolymerizer; the rotating speed of the depolymerizing machine is increased to be not less than 90% of the working rotating speed and is continued for a preset time; the depolymerization machine is connected with the grounding protection device through the residual magnetism release protector of the motor so as to quickly release the residual magnetism and the induced electricity of the depolymerization machine; the depolymerizing machine is disconnected with the residual magnetism release protector of the motor, meanwhile, the residual magnetism release protector of the motor is disconnected with the grounding protection device, and then the depolymerizing machine is connected with a power frequency power supply to realize power frequency operation; the frequency converter is started and connected with the next depolymerizer, and the power frequency operation of all depolymerizers is gradually realized; this scheme accomplishes the depolymerization quick-witted system start-up through a converter, greatly reduced the cost, and the later stage is maintained easily, and the rethread motor remanence release protector accomplishes the remanence release of depolymerization machine fast, has practiced thrift the start-up time of whole depolymerization machine system, has guaranteed the stability that the frequency conversion switches the power frequency.
Description
Technical Field
The invention relates to the technical field of depolymerizer control, in particular to a starting method of a depolymerizer system. In addition, the invention also relates to a depolymerizer system adopting the starting method of the depolymerizer system.
Background
The deagglomerator is a large-inertia device, a large belt pulley is driven by a motor to rotate, the large belt pulley transmits power to a small belt pulley, the small belt pulley accelerates to further drive the deagglomerator main body to work, the deagglomerator main body is provided with two groups of cutter discs for crushing and grading, the cutter discs are driven by a main shaft to rotate to reduce and crush agglomerated powder along the tangential direction, and then negative-pressure wind power generated by a wind impeller on the rotating main shaft discharges the scattered powder particles through a wind wheel and a volute cover at the top. Because the running speed of the main machine of the depolymerizing machine needs to reach 3600r/min, if the depolymerizing machine is directly started, the motor is easily burnt by an overcurrent load due to very high instantaneous load, a frequency converter needs to be adopted for frequency conversion starting, the depolymerizing machine is started at a low speed by the frequency converter, the frequency converter can stop working after the working load is reached, and a plurality of depolymerizing machines are required to be configured to work simultaneously in actual production to form a depolymerizing machine system so as to meet the requirements of the production process.
However, in the production of the existing depolymerizing machine system, each depolymerizing machine needs to be configured with a frequency converter to complete the start-up of the depolymerizing machine system, but this greatly increases the cost input, and also increases the difficulty and cost for the later maintenance, and the depolymerizing machine has the following problems in the process of frequency conversion start-up through the frequency converter: 1. the instantaneous electromotive force in the stator is very close to the power electromotive force when the three-phase asynchronous motor is powered off, and at the moment of switching from variable frequency to power frequency, because the initial phase of the output voltage of the frequency converter has randomness, the phase of the output three-phase power supply is possibly inconsistent with the phase of the power frequency power supply of a power grid, if the power frequency is switched immediately after the variable frequency is stopped, and because the phases of the induced electromotive force and the power frequency voltage are different, current impact is generated, the time for switching the power frequency after the variable frequency is stopped is prolonged as much as possible, so that residual magnetism is attenuated, and heavy current impact is avoided; 2. after the frequency conversion of the depolymerizing machine is stopped, the depolymerizing machine needs to be switched to power frequency as soon as possible so as to avoid overlarge starting current caused by the excessive loss of the rotating speed of the motor. Based on the problems, the switching time for switching the frequency conversion to the power frequency is difficult to control.
Disclosure of Invention
The invention provides a method for starting a depolymerizer system, which aims to solve the technical problems that when the traditional depolymerizer system is started, each depolymerizer needs to be provided with a frequency converter, the cost is high, the maintenance is difficult in the later period, and the switching time is difficult to control in the process of switching frequency to power frequency.
According to one aspect of the invention, a startup method of a depolymerizing machine system is provided, the startup method is used for starting up the depolymerizing machine system, the depolymerizing machine system comprises a plurality of depolymerizing machines, and the startup method comprises the following steps: s0, starting a frequency converter and connecting the frequency converter with a depolymerizer; s1, accelerating the speed of the depolymerization machine through a frequency converter until the rotating speed of the depolymerization machine is not less than 90% of the working rotating speed and the depolymerization machine lasts for a preset time; s2, closing and disconnecting the frequency converter from the depolymerizer, and simultaneously ensuring no input voltage of the depolymerizer; s3, the depolymerization machine is connected with the motor residual magnetism release protector, and then the motor residual magnetism release protector is connected with the grounding protection device to quickly release the residual magnetism and the induced electricity of the depolymerization machine; s4, disconnecting the depolymerizer from the motor residual magnetism release protector, simultaneously disconnecting the motor residual magnetism release protector from the grounding protection device, and then connecting the depolymerizer to a power frequency power supply to realize power frequency operation; s5, starting a frequency converter and connecting the frequency converter with the next depolymerizer; and S6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all the depolymerizers is finished.
Furthermore, a plurality of depolymerizers of the depolymerizer system are started one by one in the starting waiting area, when a fault occurs in the starting process of one depolymerizer, the next depolymerizer is directly started, and the depolymerizer with the fault enters the starting waiting area to wait in line after being maintained.
Further, in step S2, after the frequency converter is disconnected from the depolymerization machine, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is determined that a fault occurs during the startup process of the depolymerization machine.
Further, in step S3, after the depolymerization machine is connected to the residual magnetism release protector of the motor, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is determined that a fault occurs during the starting process of the depolymerization machine.
Further, in step S4, when the depolymerization machine is connected to the power frequency power supply, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is determined that a failure occurs during the startup process of the depolymerization machine.
Further, the starting command of the frequency converter comes from a local control panel; and/or the start command of the frequency converter comes from a remote control system.
Further, the value range of the preset time is 2-5 s.
Further, in step S0 or step S5, the inverter is connected to an RS flip-flop, and whether the inverter is allowed to be started or not and whether the inverter is turned off after the start is controlled by the RS flip-flop.
Further, the residual magnetism release protector of the motor is provided with an alarm device which is connected with the RS trigger and is used for transmitting an alarm signal to the RS trigger so as to close the frequency converter.
According to another aspect of the invention, the depolymerizer system comprises the startup method of the depolymerizer system.
The invention has the following beneficial effects:
according to the starting method of the depolymerizing machine system, the frequency converter is connected with the depolymerizing machine, so that the speed of the depolymerizing machine is increased, and the phenomenon that the motor is burnt out by overcurrent load when the depolymerizing machine is directly started is avoided; the rotating speed of the depolymerizing machine is increased to be not less than 90% of the working rotating speed, so that excessive starting current caused by switching power frequency is avoided, and then the preset time is continued, so that the rotating speed of the depolymerizing machine is ensured to be stable, and excessive rotating speed loss is avoided; the depolymerization machine is connected with the grounding protection device through the residual magnetism release protector of the motor so as to quickly release the residual magnetism and the induced electricity of the depolymerization machine, avoid current impact caused by different phases of induced electromotive force and power frequency voltage, simultaneously avoid overlarge starting current caused by excessive loss of the rotating speed of the motor, and avoid the switching time of switching the control frequency conversion to the power frequency; the depolymerizing machine is disconnected with the residual magnetism release protector of the motor, meanwhile, the residual magnetism release protector of the motor is disconnected with the grounding protection device, and then the depolymerizing machine is connected with a power frequency power supply to realize power frequency operation; the frequency converter is started and connected with the next depolymerizer, and the power frequency operation of all depolymerizers is gradually realized; this scheme is accomplished through a converter and is depolymerized quick-witted system start-up, for prior art, greatly reduced the cost, and the later stage is maintained easily, and the remanence release of depolymerizing quick-witted is accomplished to rethread motor remanence release protector, has practiced thrift the start-up time of whole depolymerizing quick-witted system, guarantees the stability that the frequency conversion switches the power frequency again, and the practicality is strong, is suitable for extensive popularization and application.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of the steps of a startup method for a depolymerizer system of a preferred embodiment of the invention;
FIG. 2 is a schematic diagram of the connection loop of the depolymerizer system of the preferred embodiment of the invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a block diagram of the steps of a startup method for a depolymerizer system of a preferred embodiment of the invention; FIG. 2 is a schematic diagram of the connection loop of the depolymerizer system of the preferred embodiment of the invention.
As shown in fig. 1 and 2, the startup method of the depolymerizing machine system of the embodiment is used for starting up the depolymerizing machine system, the depolymerizing machine system comprises a plurality of depolymerizing machines, and the startup method comprises the following steps: s0, starting a frequency converter and connecting the frequency converter with a depolymerizer; s1, accelerating the speed of the depolymerization machine through a frequency converter until the rotating speed of the depolymerization machine is not less than 90% of the working rotating speed and the depolymerization machine lasts for a preset time; s2, closing and disconnecting the frequency converter from the depolymerizer, and simultaneously ensuring no input voltage of the depolymerizer; s3, the depolymerization machine is connected with the motor residual magnetism release protector, and then the motor residual magnetism release protector is connected with the grounding protection device to quickly release the residual magnetism and the induced electricity of the depolymerization machine; s4, disconnecting the depolymerizer from the motor residual magnetism release protector, simultaneously disconnecting the motor residual magnetism release protector from the grounding protection device, and then connecting the depolymerizer to a power frequency power supply to realize power frequency operation; s5, starting a frequency converter and connecting the frequency converter with the next depolymerizer; and S6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all the depolymerizers is finished. In the starting method of the depolymerizing machine system, the frequency converter is connected with the depolymerizing machine to realize the speed increase of the depolymerizing machine, so that the burning out of a motor due to overcurrent load when the depolymerizing machine is directly started is avoided; the rotating speed of the depolymerizing machine is increased to be not less than 90% of the working rotating speed, so that excessive starting current caused by switching power frequency is avoided, and then the preset time is continued, so that the rotating speed of the depolymerizing machine is ensured to be stable, and excessive rotating speed loss is avoided; the depolymerization machine is connected with the grounding protection device through the residual magnetism release protector of the motor so as to quickly release the residual magnetism and the induced electricity of the depolymerization machine, avoid current impact caused by different phases of induced electromotive force and power frequency voltage, simultaneously avoid overlarge starting current caused by excessive loss of the rotating speed of the motor, and avoid the switching time of switching the control frequency conversion to the power frequency; the depolymerizing machine is disconnected with the residual magnetism release protector of the motor, meanwhile, the residual magnetism release protector of the motor is disconnected with the grounding protection device, and then the depolymerizing machine is connected with a power frequency power supply to realize power frequency operation; the frequency converter is started and connected with the next depolymerizer, and the power frequency operation of all depolymerizers is gradually realized; this scheme is accomplished through a converter and is depolymerized quick-witted system start-up, for prior art, greatly reduced the cost, and the later stage is maintained easily, and the remanence release of depolymerizing quick-witted is accomplished to rethread motor remanence release protector, has practiced thrift the start-up time of whole depolymerizing quick-witted system, guarantees the stability that the frequency conversion switches the power frequency again, and the practicality is strong, is suitable for extensive popularization and application. Optionally, in step S1, the frequency of the frequency converter is slowly increased from 0HZ to the power frequency to realize slow speed increase of the depolymerization machine, so as to avoid overload shock caused by instant start. Optionally, the power frequency is 50 HZ. It should be understood that when the residual magnetism releasing protector of the motor works, the residual magnetism releasing protector of the motor is connected with the grounding protection device; when the residual magnetism release protector of the motor stops working, the residual magnetism release protector of the motor is disconnected with the grounding protection device. Optionally, the working speed is 3600 r/min. Optionally, the motor residual magnetism release protector is SGRE-6B-01.
As shown in fig. 1, in this embodiment, a plurality of depolymerization machines of a depolymerization machine system are started up one by one in a start-up waiting area, and when a failure occurs during the start-up of a certain depolymerization machine, the next depolymerization machine is started up directly, and the failed depolymerization machine enters the start-up waiting area to wait in line after being repaired. It should be understood that, a plurality of depolymerizers of the depolymerizer system are started one by the frequency converter in the starting waiting area, and in the starting process of the depolymerizers, if the rotating speed of the depolymerizers does not reach the standard or the circuit connection is wrong, the depolymerizers are considered to be failed and can not be started forcibly, and are moved out of the starting waiting area, and simultaneously, because each depolymerizer works independently, the frequency converter can directly start the next depolymerizer, so that the time loss caused by waiting is avoided, the depolymerizers which have failed before are taken into the starting waiting area to queue for waiting after maintenance and manual confirmation that the failure is eliminated,
as shown in fig. 1, in this embodiment, in step S2, after the frequency converter is disconnected from the depolymerization machine, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is regarded that a fault occurs during the startup process of the depolymerization machine. It should be understood that if the rotating speed of the depolymerization machine is less than 90% of the working rotating speed before switching the power frequency, an overlarge starting current is caused when switching the power frequency, therefore, the rotating speed of the depolymerization machine should not be less than 90% of the working rotating speed, and the stability of the variable-frequency switching power frequency is ensured. Alternatively, the depolymerizing machine is provided with a voltmeter connected with the frequency converter for detecting whether the input voltage exists, and specifically, in step S2, the depolymerizing machine can perform step S3 only if the following conditions are simultaneously satisfied: 1. the voltmeter is disconnected with the frequency converter; 2. the voltmeter detects that no input voltage exists; 3. the rotating speed of the depolymerizing machine is not less than 90 percent of the working rotating speed.
In the embodiment, as shown in fig. 1, in step S3, after the depolymerization machine is connected to the residual magnetism release protector of the motor, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is regarded that a fault occurs during the startup process of the depolymerization machine. It should be understood that if the rotating speed of the depolymerization machine is less than 90% of the working rotating speed before switching the power frequency, an overlarge starting current is caused when switching the power frequency, therefore, the rotating speed of the depolymerization machine should not be less than 90% of the working rotating speed, and the stability of the variable-frequency switching power frequency is ensured. Specifically, in step S3, the depolymerizer may perform step S4 while satisfying the following conditions: 1. the depolymerizing machine is connected with a residual magnetism release protector of the motor; 2. the rotating speed of the depolymerizer is not less than 90% of the working rotating speed; 3. the residual magnetism release protector of the motor works.
As shown in fig. 1, in this embodiment, in step S4, when the depolymerization machine is connected to the power frequency power supply, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is determined that a failure occurs during the startup process of the depolymerization machine. It should be understood that if the rotating speed of the depolymerization machine is less than 90% of the working rotating speed before switching the power frequency, an overlarge starting current is caused when switching the power frequency, therefore, the rotating speed of the depolymerization machine should not be less than 90% of the working rotating speed, and the stability of the variable-frequency switching power frequency is ensured. Specifically, in step S4, the depolymerizer may perform step S5 while satisfying the following conditions: 1. the depolymerizing machine is disconnected with the residual magnetism release protector of the motor; 2. the rotating speed of the depolymerizer is not less than 90% of the working rotating speed; 3. the residual magnetism release protector of the motor stops working.
As shown in fig. 1, in the present embodiment, the start command of the frequency converter is from the local control panel; and/or the start command of the frequency converter comes from a remote control system. Specifically, when the depolymerization machine system needs frequency conversion and power frequency switching, a starting command can be directly sent to the frequency converter on the local control panel, and the starting command can also be sent to the frequency converter through the remote control system.
As shown in fig. 1, in this embodiment, the value of the preset time is in a range of 2 to 5 seconds. Particularly, when the preset time is between 2 and 5 seconds, the rotating speed of the depolymerizing machine can be ensured to be stable, and excessive rotating speed loss is avoided; when the preset time is less than 2s, the time is too short, and the rotating speed of the depolymerizer cannot be kept stable; when the preset time is more than 5s, the time is too long, and the rotating speed loss of the depolymerizing machine is possibly too much.
As shown in fig. 1, in this embodiment, in step S0 or step S5, the frequency converter is connected to the RS flip-flop, and whether the frequency converter is allowed to start and is turned off after being started is controlled by the RS flip-flop. It should be appreciated that the RS flip-flop allows the frequency converter to start when the following conditions are simultaneously met: 1. the frequency converter is connected with the depolymerizer; 2. the depolymerizing machine is disconnected with the power frequency power supply; 3. the depolymerizing machine is disconnected with the residual magnetism release protector of the motor.
As shown in fig. 1, in this embodiment, the residual magnetism release protector of the motor is provided with an alarm device connected with the RS trigger and used for transmitting an alarm signal to the RS trigger to turn off the frequency converter. Specifically, when the RS trigger receives an alarm signal, the frequency converter is closed. It should be understood that after the frequency converter is started, the RS flip-flop turns off the frequency converter when any one of the following conditions is triggered: 1. the frequency converter is disconnected with the depolymerizer; 2. a depolymerizer and a power frequency power supply; 3. the depolymerizing machine is connected with a residual magnetism release protector of the motor; 4. the residual magnetism release protector of the motor transmits an alarm signal to the RS trigger.
As shown in fig. 2, the depolymerization machine system of the present embodiment adopts the above-described startup method of the depolymerization machine system. Specifically, the depolymerization machine system comprises a plurality of depolymerization machines, a frequency converter and a motor residual magnetism release protector, the frequency converter is used for realizing the speed increase of the depolymerization machines, and the motor residual magnetism release protector is used for ensuring the stable frequency conversion switching power frequency of the depolymerization machines.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A startup method of a depolymerizer system is used for starting up the depolymerizer system, the depolymerizer system comprises a plurality of depolymerizers, and the startup method comprises the following steps:
s0, starting a frequency converter and connecting the frequency converter with a depolymerizer;
s1, accelerating the speed of the depolymerization machine through a frequency converter until the rotating speed of the depolymerization machine is not less than 90% of the working rotating speed and the depolymerization machine lasts for a preset time;
s2, closing and disconnecting the frequency converter from the depolymerizer, and simultaneously ensuring no input voltage of the depolymerizer;
s3, the depolymerization machine is connected with the motor residual magnetism release protector, and then the motor residual magnetism release protector is connected with the grounding protection device to quickly release the residual magnetism and the induced electricity of the depolymerization machine;
s4, disconnecting the depolymerizer from the motor residual magnetism release protector, simultaneously disconnecting the motor residual magnetism release protector from the grounding protection device, and then connecting the depolymerizer to a power frequency power supply to realize power frequency operation;
s5, starting a frequency converter and connecting the frequency converter with the next depolymerizer;
and S6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all the depolymerizers is finished.
2. The startup method of a depolymerizer system according to claim 1, characterized in that a plurality of depolymerizers of the depolymerizer system are started one by one in a startup waiting area, when a failure occurs in the startup process of one depolymerizer, the next depolymerizer is started directly, and the depolymerizer with the failure enters the startup waiting area to wait in line after being maintained.
3. The method of claim 2, wherein in step S2, after the frequency converter is disconnected from the depolymerizer, the rotational speed of the depolymerizer should be no less than 90% of the operating rotational speed, otherwise, it is determined that the depolymerizer is in failure during the startup process.
4. The method for starting the depolymerizing machine system according to claim 2, wherein in step S3, after the depolymerizing machine is connected with the residual magnetism release protector of the motor, the rotating speed of the depolymerizing machine is not less than 90% of the operating rotating speed, otherwise, the depolymerizing machine is regarded as failed in the starting process.
5. The method of claim 2, wherein in step S4, when the depolymerization machine is connected to the power frequency power supply, the rotation speed of the depolymerization machine should be not less than 90% of the operating rotation speed, otherwise, it is determined that a failure occurs during the startup of the depolymerization machine.
6. The startup method of a depolymerizer system according to claim 1, characterized in that the startup command of the frequency converter comes from a local control panel; and/or
The starting command of the frequency converter comes from a remote control system.
7. The startup method of the depolymerizer system according to any one of claims 1 to 6, wherein the preset time is set to a value in a range of 2 to 5 seconds.
8. The startup method of the depolymerizing machine system according to any one of claims 1 to 6, wherein in step S0 or step S5, the frequency converter is connected to an RS trigger, and whether the frequency converter is allowed to start up and whether the frequency converter is turned off after starting up is controlled by the RS trigger.
9. The startup method of the depolymerizing machine system according to claim 8, characterized in that the motor residual magnetism release protector is provided with an alarm device connected with the RS trigger and used for transmitting an alarm signal to the RS trigger to close the frequency converter.
10. A depolymerizer system characterized by a method of starting up the depolymerizer system according to any one of claims 1 to 9.
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