CN114289168B - Method for starting depolymerizer system - Google Patents
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- CN114289168B CN114289168B CN202111631646.6A CN202111631646A CN114289168B CN 114289168 B CN114289168 B CN 114289168B CN 202111631646 A CN202111631646 A CN 202111631646A CN 114289168 B CN114289168 B CN 114289168B
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Abstract
The invention discloses a starting method of a depolymerization machine system, which is connected with a depolymerization machine through a frequency converter to realize the acceleration of the depolymerization machine; the rotational speed of the depolymerizing machine is increased to be not less than 90% of the working rotational speed, and the preset time is continued; the depolymerization machine is connected with the grounding protection device through a motor remanence release protector so as to quickly release remanence and induced electricity of the depolymerization machine; the depolymerizing machine is disconnected with the motor remanence release protector, and meanwhile, the motor remanence release protector 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 depolymerization machine, so that the power frequency operation of all depolymerization machines is realized gradually; according to the scheme, the depolymerizer system is started through the frequency converter, so that the cost is greatly reduced, the later-period maintenance is easy, the residual magnetism release of the depolymerizer is rapidly finished through the motor residual magnetism release protector, the starting time of the whole depolymerizer system is saved, and the stability of frequency conversion switching power frequency is ensured.
Description
Technical Field
The invention relates to the technical field of depolymerizer control, in particular to a method for starting a depolymerizer system.
Background
The depolymerizer is a large-inertia device, a large belt pulley is driven to rotate by a motor, the large belt pulley transmits power to a small belt pulley, the small belt pulley accelerates, and then the depolymerizer main body is driven to work, two groups of cutterheads are arranged on the depolymerizer main body, the main shaft drives the two groups of cutterheads to rotate, agglomerated powder is reduced and crushed along the tangential direction, and then scattered powder particles are discharged through the wind wheel and a volute cover at the top by negative pressure wind power generated by a fan blade wheel on the rotating main shaft. Since the running speed of the depolymerizer main machine needs to reach 3600r/min, for example, when the depolymerizer main machine is directly started, the instantaneous load is very high, so that the motor is burnt out by the overload easily, the frequency converter is required to be used for frequency conversion starting, the low-speed starting is firstly carried out through the frequency converter, the frequency converter can stop working after the working load is reached, and in actual production, a plurality of depolymerizers are required to be configured to work simultaneously to form a depolymerizer system, so that the requirement of the production process can be met.
However, in the production of the existing depolymerizer system, each depolymerizer needs to be provided with a frequency converter to finish the start of the depolymerizer system, but this greatly increases the cost input, and meanwhile increases the difficulty and cost for the later maintenance, and the following problems still exist in the process of starting the depolymerizer through the frequency conversion of the frequency converter: 1. when the three-phase asynchronous motor is powered off, the instantaneous electromotive force in the stator is very close to the power electromotive force, and at the moment of switching from frequency conversion to power frequency, the output voltage initial phase of the frequency converter has randomness, so that the output three-phase power phase and the power frequency power phase of the power grid are completely possibly inconsistent, if the power frequency is switched immediately after stopping frequency conversion, the current impact is generated due to the difference between the induced electromotive force and the power frequency voltage phase, the time for switching the power frequency after stopping frequency conversion should be prolonged as much as possible, so that the remanence is attenuated, and the heavy current impact is avoided; 2. after the depolymerizer is in frequency conversion and shutdown, the depolymerizer needs to be switched to power frequency as soon as possible, so as to avoid overlarge starting current caused by overlarge rotating speed loss of the motor. Based on the above problems, the switching time for switching the frequency conversion to the power frequency is difficult to control.
Disclosure of Invention
The invention provides a starting method of a depolymerization machine system, which aims to solve the technical problems that when the existing depolymerization machine system is started, each depolymerization machine needs to be provided with a frequency converter, the cost is high, the later period is difficult to maintain, and the switching time is difficult to control in the process of switching the frequency conversion to power frequency.
According to an aspect of the present invention, there is provided a method of starting a depolymerizer system for starting the depolymerizer system, the depolymerizer system including a plurality of depolymerizers, the method comprising the steps of: s0, starting a frequency converter and connecting the frequency converter with a depolymerization machine; s1, accelerating a 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 preset time is continued; s2, the frequency converter is closed and disconnected with the depolymerization machine, and meanwhile no input voltage of the depolymerization machine is ensured; s3, connecting the depolymerizer with a motor remanence release protector, and then connecting the motor remanence release protector with a grounding protection device to quickly release remanence and induced electricity of the depolymerizer; s4, disconnecting the depolymerizer from the motor remanence release protector, disconnecting the motor remanence release protector from the grounding protection device, and connecting the depolymerizer with a power frequency power supply to realize power frequency operation; s5, starting a frequency converter and connecting the frequency converter with the next depolymerizing machine; s6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all depolymerization machines is completed.
Further, a plurality of depolymerization machines of the depolymerization machine system are started one by one in the starting waiting area, when a fault occurs in the starting process of one depolymerization machine, the next depolymerization machine is directly started, and the depolymerization machine with the fault enters the starting waiting area to wait in a queuing manner after being maintained.
Further, in step S2, after the frequency converter is disconnected from the depolymerizer, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the starting process.
Further, in step S3, after the depolymerizer is connected to the motor remanence release protector, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the starting process.
Further, in step S4, when the depolymerizer is connected to the power frequency power supply, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the starting process.
Further, the start command of the frequency converter comes from an in-situ control panel; and/or the start command of the frequency converter is from a remote control system.
Further, the value range of the preset time is 2-5s.
Further, in step S0 or step S5, the frequency converter is connected to the RS trigger, and the RS trigger controls whether the frequency converter is allowed to be started and whether the frequency converter is closed after the frequency converter is started.
Further, the motor remanence release protector is provided with an alarm device which is connected with the RS trigger and used for transmitting an alarm signal to the RS trigger to close the frequency converter.
The invention has the following beneficial effects:
according to the starting method of the depolymerization machine system, the frequency converter is connected with the depolymerization machine to achieve speed increasing of the depolymerization machine, and the phenomenon that an overcurrent load burns out a motor when the depolymerization machine is directly started is avoided; the rotational speed of the depolymerization machine is increased to be not less than 90% of the working rotational speed, so that excessive starting current caused by switching power frequency is avoided, and then the preset time is continued, so that the rotational speed of the depolymerization machine is ensured to be stable, and excessive rotational speed loss is avoided; the depolymerization machine is connected with the grounding protection device through the motor remanence release protector so as to quickly release remanence and induced electricity of the depolymerization machine, avoid current impact caused by different induced electromotive force and power frequency voltage phases, and simultaneously avoid overlarge starting current caused by overlarge rotating speed loss of the motor, and the switching time for switching control frequency conversion to power frequency is not needed; the depolymerizing machine is disconnected with the motor remanence release protector, and meanwhile, the motor remanence release protector 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 depolymerization machine, so that the power frequency operation of all depolymerization machines is realized gradually; compared with the prior art, the scheme has the advantages that the depolymerization machine system is started through one frequency converter, the cost is greatly reduced, the later maintenance is easy, the residual magnetism release of the depolymerization machine is rapidly completed through the motor residual magnetism release protector, the starting time of the whole depolymerization machine system is saved, the stability of frequency conversion switching power frequency is guaranteed, the practicability is high, and the depolymerization machine is suitable for wide popularization and application.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a block diagram of the steps of a method of starting a depolymerizer system in accordance with a preferred embodiment of the present invention;
FIG. 2 is a connection loop diagram of a depolymerizer system of a preferred embodiment of the present invention.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
FIG. 1 is a block diagram of the steps of a method of starting a depolymerizer system in accordance with a preferred embodiment of the present invention; FIG. 2 is a connection loop diagram of a depolymerizer system of a preferred embodiment of the present invention.
As shown in fig. 1 and 2, the method for starting the depolymerizer system according to the present embodiment is used for starting the depolymerizer system, the depolymerizer system includes a plurality of depolymerizers, and the method for starting the depolymerizer system includes the following steps: s0, starting a frequency converter and connecting the frequency converter with a depolymerization machine; s1, accelerating a 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 preset time is continued; s2, the frequency converter is closed and disconnected with the depolymerization machine, and meanwhile no input voltage of the depolymerization machine is ensured; s3, connecting the depolymerizer with a motor remanence release protector, and then connecting the motor remanence release protector with a grounding protection device to quickly release remanence and induced electricity of the depolymerizer; s4, disconnecting the depolymerizer from the motor remanence release protector, disconnecting the motor remanence release protector from the grounding protection device, and connecting the depolymerizer with a power frequency power supply to realize power frequency operation; s5, starting a frequency converter and connecting the frequency converter with the next depolymerizing machine; s6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all depolymerization machines is completed. Specifically, the starting method of the depolymerization machine system is connected with the depolymerization machine through the frequency converter so as to realize the speed increase of the depolymerization machine and avoid the motor from being burnt out by the overload caused by direct starting; the rotational speed of the depolymerization machine is increased to be not less than 90% of the working rotational speed, so that excessive starting current caused by switching power frequency is avoided, and then the preset time is continued, so that the rotational speed of the depolymerization machine is ensured to be stable, and excessive rotational speed loss is avoided; the depolymerization machine is connected with the grounding protection device through the motor remanence release protector so as to quickly release remanence and induced electricity of the depolymerization machine, avoid current impact caused by different induced electromotive force and power frequency voltage phases, and simultaneously avoid overlarge starting current caused by overlarge rotating speed loss of the motor, and the switching time for switching control frequency conversion to power frequency is not needed; the depolymerizing machine is disconnected with the motor remanence release protector, and meanwhile, the motor remanence release protector 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 depolymerization machine, so that the power frequency operation of all depolymerization machines is realized gradually; compared with the prior art, the scheme has the advantages that the depolymerization machine system is started through one frequency converter, the cost is greatly reduced, the later maintenance is easy, the residual magnetism release of the depolymerization machine is rapidly completed through the motor residual magnetism release protector, the starting time of the whole depolymerization machine system is saved, the stability of frequency conversion switching power frequency is guaranteed, the practicability is high, and the depolymerization machine is suitable for wide popularization and application. Optionally, in step S1, the frequency of the frequency converter is slowly increased from 0HZ to the power frequency, so as to achieve slow speed increase of the depolymerization machine, and avoid overload impact caused by instantaneous start. Alternatively, the power frequency is 50HZ. It should be appreciated that when the motor remanence release protector is in operation, the motor remanence release protector is connected to the ground protection device; when the motor remanence release protector stops working, the motor remanence release protector is disconnected with the grounding protection device. Alternatively, the operating speed is 3600 r/min. Optionally, the motor residual magnetic release protector is SGRE-6B-01.
As shown in fig. 1, in this embodiment, a plurality of depolymerizers of the depolymerizer system are started one by one in a start-up waiting area, when a failure occurs in the start-up process of one depolymerizer, the next depolymerizer is directly started, and after the failed depolymerizer is maintained, the depolymerizer enters the start-up waiting area to wait in a queue. It should be understood that the multiple depolymerizers of the depolymerizer system are started one by the frequency converter in the start waiting area, and if the rotational speed of the depolymerizer is not up to standard or the circuit connection is wrong in the process of starting the depolymerizers, the depolymerizers are regarded as faults, the depolymerizers can not be forcedly started and are moved out of the start waiting area, meanwhile, because each depolymerizer works independently, at the moment, the frequency converter can directly start the next depolymerizer, so that the time loss caused by waiting is avoided, and as for the depolymerizer with the fault, the depolymerizer with the fault before is brought into the start waiting area to wait in a queue after maintenance and manual confirmation of the fault elimination,
in the embodiment, as shown in fig. 1, in step S2, after the frequency converter is disconnected from the depolymerizer, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the process of starting. It should be understood that if the rotational speed of the depolymerizer is less than 90% of the working rotational speed before the power frequency is switched, an excessive starting current is caused when the power frequency is switched, so that the rotational speed of the depolymerizer should not be less than 90% of the working rotational speed, and the stability of the variable frequency switching power frequency is ensured. Optionally, the depolymerizer is provided with a voltmeter connected to the frequency converter for detecting whether there is an input voltage, specifically, in step S2, the depolymerizer should simultaneously satisfy the following conditions to perform step S3: 1. the voltmeter is disconnected with the frequency converter; 2. the voltmeter detects no input voltage; 3. the rotational speed of the depolymerizer is not less than 90% of the working rotational speed.
In the embodiment, as shown in fig. 1, in step S3, after the depolymerizer is connected to the motor remanence release protector, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the starting process. It should be understood that if the rotational speed of the depolymerizer is less than 90% of the working rotational speed before the power frequency is switched, an excessive starting current is caused when the power frequency is switched, so that the rotational speed of the depolymerizer should not be less than 90% of the working rotational speed, and the stability of the variable frequency switching power frequency is ensured. Specifically, in step S3, the depolymerizer should simultaneously satisfy the following conditions to perform step S4: 1. the depolymerizing machine is connected with a motor remanence release protector; 2. the rotational speed of the depolymerizer is not less than 90% of the working rotational speed; 3. the motor residual magnetism release protector works.
In the embodiment, as shown in fig. 1, in step S4, when the depolymerizer is connected to the power frequency power source, the rotational speed of the depolymerizer should be not less than 90% of the working rotational speed, otherwise, the depolymerizer is considered to be failed in the starting process. It should be understood that if the rotational speed of the depolymerizer is less than 90% of the working rotational speed before the power frequency is switched, an excessive starting current is caused when the power frequency is switched, so that the rotational speed of the depolymerizer should not be less than 90% of the working rotational speed, and the stability of the variable frequency switching power frequency is ensured. Specifically, in step S4, the depolymerizer should simultaneously satisfy the following conditions to perform step S5: 1. the depolymerizing machine is disconnected with a motor remanence release protector; 2. The rotational speed of the depolymerizer is not less than 90% of the working rotational speed; 3. and stopping the motor residual magnetism release protector.
As shown in fig. 1, in the present embodiment, the start command of the frequency converter is from the in-situ control panel; and/or the start command of the frequency converter is from a remote control system. Specifically, when the depolymerizer system needs to change frequency to switch power frequency, a start command can be directly sent to the frequency converter on the on-site control panel, and the start command can also be sent to the frequency converter through the remote control system.
In this embodiment, as shown in fig. 1, the value range of the preset time is 2-5s. Specifically, when the preset time is between 2 and 5 seconds, the rotational speed of the depolymerizer can be ensured to be stable, and excessive rotational speed loss is avoided; when the preset time is less than 2s, the time is too short, and the rotational speed of the depolymerizer cannot be ensured to be kept stable; when the preset time is longer than 5s, the rotation speed of the depolymerizer is possibly lost too much.
In the embodiment, as shown in fig. 1, in step S0 or step S5, the frequency converter is connected to the RS trigger, and the RS trigger controls whether the frequency converter is allowed to be started or not and whether the frequency converter is closed after the starting. 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 depolymerization machine; 2. the depolymerizing machine is disconnected with a power frequency power supply; 3. the depolymerizer disconnects from the motor residual magnetic release protector.
As shown in fig. 1, in this embodiment, the motor remanence release protector is provided with an alarm device connected with the RS trigger for transmitting an alarm signal to the RS trigger to turn off the frequency converter. Specifically, when the RS flip-flop receives the alarm signal, the frequency converter is turned off. It should be appreciated that after the frequency converter is started, the RS flip-flop turns off the frequency converter when either of the following conditions is triggered: 1. the frequency converter is disconnected with the depolymerization machine; 2. depolymerizing machine and power frequency power supply; 3. the depolymerizing machine is connected with a motor remanence release protector; 4. the motor residual magnetism release protector transmits an alarm signal to the RS trigger.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method of starting a depolymerizer system for starting the depolymerizer system, the depolymerizer system comprising a plurality of depolymerizers, the method comprising the steps of:
s0, starting a frequency converter and connecting the frequency converter with a depolymerization machine;
s1, accelerating a 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, wherein the value range of the preset time is 2-5S;
s2, the frequency converter is closed and disconnected with the depolymerization machine, and meanwhile no input voltage of the depolymerization machine is ensured;
s3, connecting the depolymerizer with a motor remanence release protector, and then connecting the motor remanence release protector with a grounding protection device to quickly release remanence and induced electricity of the depolymerizer;
s4, disconnecting the depolymerizer from the motor remanence release protector, disconnecting the motor remanence release protector from the grounding protection device, and connecting the depolymerizer with a power frequency power supply to realize power frequency operation;
s5, starting a frequency converter and connecting the frequency converter with the next depolymerizing machine;
s6, repeating the steps S1, S2, S3, S4 and S5 until the power frequency operation of all depolymerization machines is completed;
starting a plurality of depolymerization machines of the depolymerization machine system one by one in a starting waiting area, when a fault occurs in the starting process of one depolymerization machine, directly starting the next depolymerization machine, and after the maintenance of the depolymerization machine with the fault, entering the starting waiting area for queuing;
in the step S2, after the frequency converter is disconnected with the depolymerization machine, the rotational speed of the depolymerization machine is not less than 90% of the working rotational speed, otherwise, the depolymerization machine is regarded as a fault in the starting process of the depolymerization machine;
in the step S3, after the depolymerizer is connected with the motor remanence release protector, the rotational speed of the depolymerizer is not less than 90% of the working rotational speed, otherwise, the depolymerizer is regarded as a fault in the starting process of the depolymerizer;
in step S4, when the depolymerization machine is connected with the power frequency power supply, the rotational speed of the depolymerization machine is not less than 90% of the working rotational speed, otherwise, the depolymerization machine is regarded as a fault in the starting process of the depolymerization machine.
2. The method of starting up a depolymerizer system of claim 1, wherein the start-up command for the inverter is from an in-situ control panel; and/or
The start command of the frequency converter comes from a remote control system.
3. The method of starting up a depolymerizer system according to any one of claims 1-2, wherein in step S0 or step S5, the inverter is connected to an RS trigger, and whether the inverter is allowed to start up and whether it is turned off after start up is controlled by the RS trigger.
4. A method of starting a depolymerizer system as claimed in claim 3, wherein the motor remanence release protector is provided with an alarm device connected to the RS trigger for transmitting an alarm signal to the RS trigger to turn off the frequency converter.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR920015324A (en) * | 1991-01-25 | 1992-08-26 | 강진구 | Spindle motor abnormal rotation prevention circuit |
| CN206928371U (en) * | 2017-01-13 | 2018-01-26 | 奥利机械(集团)有限公司 | New waterproof hammers functional device into shape |
| CN107742964A (en) * | 2017-11-20 | 2018-02-27 | 黄舒淳 | A kind of electric variable frequency brushless synchronous generating group |
| CN208786656U (en) * | 2018-08-02 | 2019-04-26 | 贵州成智重工科技有限公司 | Start the frequency-converting control device of double broken hosts using single frequency converter |
| CN211183845U (en) * | 2019-12-13 | 2020-08-04 | 上海福思特流体机械有限公司 | Frequency conversion switching power frequency device for motor dragging load |
| CN112072985A (en) * | 2019-06-10 | 2020-12-11 | 中国石油化工股份有限公司 | Double-frequency conversion switching system and switching method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201332383Y (en) * | 2009-01-06 | 2009-10-21 | 西王集团有限公司 | Water passing motor control circuit |
| CN101839450B (en) * | 2010-01-13 | 2013-10-09 | 海洋王照明科技股份有限公司 | Focusing device of lamp fitting and variable-focus illumination lamp fitting thereof |
| CN205123647U (en) * | 2015-10-26 | 2016-03-30 | 中国工程物理研究院材料研究所 | Frequency conversion switching control ware frequently of changing a job and device thereof |
| CN205304650U (en) * | 2015-12-07 | 2016-06-08 | 大禹电气科技股份有限公司 | Motor high -voltage frequency converters soft start no. 1 drags two devices |
| CN206313698U (en) * | 2016-09-05 | 2017-07-07 | 上海京藤化工有限公司 | A kind of frequency conversion and power frequency switching circuit air-cooler |
| CN108855575B (en) * | 2018-08-02 | 2023-06-27 | 贵州成智重工科技有限公司 | Variable frequency control device and method for starting double crushing hosts by adopting single frequency converter |
| CN211880319U (en) * | 2020-04-03 | 2020-11-06 | 合肥热电集团有限公司 | Control device for switching motor from frequency conversion to power frequency state |
| CN211791350U (en) * | 2020-05-25 | 2020-10-27 | 浙江欣灵自动化有限公司 | A electrical control system for breeding trade fan frequency conversion |
-
2021
- 2021-12-29 CN CN202111631646.6A patent/CN114289168B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR920015324A (en) * | 1991-01-25 | 1992-08-26 | 강진구 | Spindle motor abnormal rotation prevention circuit |
| CN206928371U (en) * | 2017-01-13 | 2018-01-26 | 奥利机械(集团)有限公司 | New waterproof hammers functional device into shape |
| CN107742964A (en) * | 2017-11-20 | 2018-02-27 | 黄舒淳 | A kind of electric variable frequency brushless synchronous generating group |
| CN208786656U (en) * | 2018-08-02 | 2019-04-26 | 贵州成智重工科技有限公司 | Start the frequency-converting control device of double broken hosts using single frequency converter |
| CN112072985A (en) * | 2019-06-10 | 2020-12-11 | 中国石油化工股份有限公司 | Double-frequency conversion switching system and switching method thereof |
| CN211183845U (en) * | 2019-12-13 | 2020-08-04 | 上海福思特流体机械有限公司 | Frequency conversion switching power frequency device for motor dragging load |
Non-Patent Citations (1)
| Title |
|---|
| 煤矿乳化液泵变频/工频切换控制;付翔;王然风;袁继成;董志勇;;工矿自动化(第01期);全文 * |
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