CN113097974A - Disintegrating machine - Google Patents
Disintegrating machine Download PDFInfo
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- CN113097974A CN113097974A CN202010016574.3A CN202010016574A CN113097974A CN 113097974 A CN113097974 A CN 113097974A CN 202010016574 A CN202010016574 A CN 202010016574A CN 113097974 A CN113097974 A CN 113097974A
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- driving motor
- current value
- frequency converter
- control processor
- frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0853—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load specially adapted for motors rotating in both directions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The present invention provides a crusher for crushing an object by a crushing blade, comprising: a drive motor for driving the crushing blade to rotate in the forward and reverse directions; a frequency converter for controlling the rotation speed and the rotation direction of the drive motor by converting the frequency; and a control processor for controlling the frequency converter; the control processor repeatedly performs the following overload relief processing: that is, the control processor detects that the driving current value of the frequency converter is greater than or equal to a preset overload current value in the process of enabling the driving motor to rotate forwards at the forward rotation frequency through the frequency converter, and stops the driving motor through the frequency converter after the driving motor continues for a preset time, enables the driving motor to rotate backwards for a certain time through the frequency converter at the reverse rotation frequency after the driving motor stops for the preset time, and enables the driving motor to rotate forwards at the forward rotation frequency through the frequency converter after the driving motor stops for the preset time. The invention provides a pulverizer which can prevent the pulverization efficiency from being influenced by the repeated occurrence of the locking phenomenon of a pulverization object and can prolong the service life of a driving motor.
Description
Technical Field
The invention relates to a crusher, in particular to a crusher for crushing plastics.
Background
A crusher for crushing leftover materials of injection molding products is commonly used in the injection molding industry, and the crushed leftover materials of the injection molding products are recycled as injection molding materials. A crusher of this type has a structure as disclosed in patent document 1, and includes two rollers, and blades are provided on the two rollers at intervals so as to rotate in opposite directions to crush and crush plastic.
However, since the injection molding product has irregular shape and size of the scraps and the scraps may be interlaced with each other, the scraps may be jammed between the blades when the injection molding product is crushed by the crusher, and the crusher may be stopped.
In order to reduce the occurrence of the above-described phenomenon, there is a conventional technique of adjusting the gap between two rollers to ensure that the object to be ground does not pass through the roller gap smoothly due to an excessively large volume of the object to be ground, as disclosed in patent document 2. In addition, there is also a solution as in patent document 3, which ensures separation and pulverization of some large objects to be pulverized in a targeted manner by changing the structures of the roller shaft and the blade.
Further, there is a conventional technique in which, while improving the roller shaft, the operating state of the roller shaft is detected by a current sensor, and when the roller shaft is determined to be in the locked state, the roller shaft is reversed for a predetermined time to loosen the object to be pulverized, and the direction of the object to be pulverized is changed so that the object falls under another cutting condition to be pulverized or cut, as in patent document 4.
Although the technical means as described in patent document 4 can automatically detect the locking phenomenon of the roller shaft (i.e., the blade) and separate the hard objects to be crushed, the following problems still remain
1. Although the roller shaft is rotated reversely to loosen the blocked object to be crushed and then rotated forward again to continuously crush the object to be crushed, the initial torque after the rotation forward again is still small, which is often insufficient to cut or crush hard or canine-teeth-staggered crushed objects, and finally the object to be crushed can be cleaned on site only by operators, so that the crushing efficiency is reduced
2. In the process of the above-mentioned blocking phenomenon continuously and repeatedly occurring, the load of the driving motor for driving the crushing blade is continuously overloaded, so that the service life of the driving motor is reduced and even the driving motor is burnt out
In addition, the conventional pulverizer has a problem of energy waste caused by continuous idling when the supply of the pulverizing object is occasionally cut off.
Prior art documents:
patent document 1: CN 106553287A;
patent document 2: CN 206980835U;
patent document 3: CN 208098298U;
patent document 4: CN 102196864A.
Disclosure of Invention
In view of the above-described problems of the prior art, it is an object of the present invention to provide a pulverizer capable of improving the life of a drive motor while preventing the pulverizing efficiency from being affected by the repetition of the phenomenon of the object to be pulverized being stuck, and to provide a pulverizer capable of saving energy consumption during idling.
The present invention provides a crusher for crushing an object by a crushing blade, comprising: a drive motor for driving the crushing blade to rotate in the forward and reverse directions; a frequency converter for controlling the rotation speed and the rotation direction of the drive motor by converting the frequency; and a control processor for controlling the frequency converter; the control processor repeatedly performs the following overload relief processing: that is, the control processor detects that the driving current value of the frequency converter is greater than or equal to a preset overload current value in the process of enabling the driving motor to rotate forwards at the forward rotation frequency through the frequency converter, and stops the driving motor through the frequency converter after the driving motor continues for a preset time, enables the driving motor to rotate backwards for the preset time through the frequency converter at the reverse rotation frequency after the driving motor stops for the preset time, and enables the driving motor to rotate forwards at the forward rotation frequency through the frequency converter after the driving motor stops for the preset time.
According to the pulverizer, the control processor detects that the driving current value of the frequency converter is above the preset overload current value in the process of enabling the driving motor to rotate forwards through the frequency converter at the forward rotation frequency, and stops the driving motor through the frequency converter after the driving current value lasts for the preset time, so that the situation that the driving current value exceeds the overload current value occasionally and instantly but is not really blocked but stops can be prevented, and the reliability of the pulverizer is improved. In addition, the inverter is adopted to control the driving motor, so that the initial torque when the driving motor rotates forwards again is maintained at a larger level, the blade can cut or crush the object with larger torque, and the phenomenon that the object is blocked is easier to eliminate compared with the prior art. In addition, the overload releasing process can be automatically repeated, and the possibility that the crusher is used for eliminating continuous locking of the object is increased.
Preferably, the control processor further includes a counter configured to count the number of times of the overload release processing, and when the number of times of the overload release processing accumulated in the counter reaches a preset number, the inverter stops the driving motor and terminates the overload release processing.
According to the above-described pulverizer, when the overload releasing process is repeated a plurality of times and the object to be locked cannot be released, the drive motor is stopped by the inverter, and the overload releasing process is terminated. Thus, it is possible to prevent the reduction of the crusher efficiency caused by the overload processing being continuously repeated even when the crusher is severely stuck.
It is further preferable that the control processor further includes a timer for counting time from a time when the number of times of accumulation of the counter is 1, and the number of times of accumulation in the timer is set to zero when a time of accumulation in the timer reaches a preset time.
According to the crusher, if the number of times of overload releasing treatment of the crusher does not exceed the preset number of times within the preset time, the clamping phenomenon is eliminated, the accumulated number of times of overload releasing treatment can be reset to zero, and the number of times of overload releasing treatment is accumulated again, so that the clamping phenomenon which occurs newly can be reasonably relieved.
Preferably, the frequency converter is a frequency converter using a sensorless vector control method.
According to the pulverizer, compared with the traditional motor control system adopting a speed (rotating speed) sensor, the pulverizer can save cost, simplify the structure, prevent control from being interfered easily, and improve the reliability of control. And meanwhile, the device is not limited by conditions such as temperature, humidity, vibration and the like.
On the basis of the above pulverizer, the present invention also provides a pulverizer having an energy saving processing mode, wherein the control processor further repeats the following energy saving processing: that is, the control processor detects that a driving current value of the inverter is below a preset energy-saving current value in a process of normally rotating the driving motor by the inverter at a normal mode rotation frequency, and after the driving current value lasts for a preset time, the driving motor is rotated in an energy-saving mode rotation frequency by the inverter; in the process of energy-saving rotation, when the driving current value of the frequency converter is detected to be more than the preset energy-saving mode rotation release current value, the frequency converter enables the driving motor to normally rotate again at the normal mode rotation frequency
The crusher with the structure can be operated at a lower frequency when detecting that the crusher does not crush the object, thereby avoiding the waste of electric power and saving energy consumption.
Drawings
FIG. 1 is a system schematic of a shredder according to the present invention;
FIG. 2 is a block diagram of the operational steps of the overload release function of the pulverizer to which the present invention relates;
FIG. 3 is a block diagram of the operational steps of the energy saving function of the pulverizer to which the present invention relates;
fig. 4 is a schematic diagram of the sensorless vector control feature of the present invention.
Detailed Description
Hereinafter, a pulverizer and an operation control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.
The crusher according to the present embodiment is a crusher for crushing scraps of injection molded products, and has a hopper, a crushing box located below the hopper, a base on which the crushing box is fixedly installed, and the like (not shown), in an overall structure similar to that of a crusher in the related art (for example, a crusher in patent document 1). The hopper is used for feeding materials, and the crushing box body is mainly used for forming a crushing working cavity and crushing the fed materials (namely objects). The main function of the base is supporting, which is used to support the whole crushing box body and the hopper. The crushing box body is provided with a crushing blade which is driven by a driving motor to rotate, and the object is sent into the crushing box body through a hopper and then cut and crushed by the rotating crushing blade. The feeding, crushing and other operations of the crusher are controlled by the control processor.
As shown in fig. 1, in the crusher of the present embodiment, an inverter 2 is additionally provided between a drive motor 1 and a control processor 3, and the inverter 2 adopts a sensorless vector control method.
The sensorless vector control system includes a current control unit having a power converter for outputting electric power to the ac motor, the current control unit controlling an output current of the power converter based on a deviation signal between a current command signal and an output current detection signal of the power converter, the current control unit controlling the output current of the power converter based on the deviation signal between the current command signal and the output current detection signal of the power converter, and the current control unit detecting a frequency component appearing in the output current detection signal of the power converter by supplying only an arbitrary dc current for a set time when the ac motor is in a free running state.
Since the inverter 2 adopts the sensorless vector control method, every time the driving motor 1 is operated again after being stopped, it is started with a large torque as shown in fig. 2.
Compared with the driving manner of the inverter 2 employing such sensorless vector control, the conventional three-phase alternating-current induction motor starts to increase in torque in a slow manner at the time of starting driving of the motor (when the rotation speed is low). In this state, the initial torque of the grinding blade cannot be maximized, and the torque required for the motor cannot be obtained when the motor rotates at a low speed.
On the other hand, in the case of the driving method of the inverter 2 by the sensorless vector control, the inverter 2 calculates the most appropriate current and voltage from the output frequency to control the driving motor 1, so that the driving motor 1 can obtain a value close to the maximum torque from the low-speed rotation, and the relationship between the torque and the frequency is shown in fig. 2, and the maximum torque (200%) can be obtained at the low frequency (e.g., 30 Hz).
In this way, in the present embodiment, when the crusher is stopped, the inverter 2 rotates the driving motor 1 in the reverse direction to release the stop and stop the same, and then rotates the driving motor 1 in the forward direction again, the crushing blade can cut and crush the objects involved in the stop with a large initial torque, thereby increasing the possibility of cutting and crushing the objects involved in the stop and realizing the continuous normal operation of the crusher. Meanwhile, in the present embodiment, a process in which the inverter 2 causes the driving motor 1 to rotate the grinding blade in the reverse direction and Stop the rotation in the forward direction again is referred to as an Overload release (OSR) process (abbreviated as OSR process), the OSR process is performed when the control processor 3 detects that a current value from the inverter 2 (also referred to as a driving current value (Ac) of the inverter 2) reflecting the occurrence of the seizing phenomenon exceeds a preset Overload current value (Ao), and the grinder is stopped to remove the seizing by human power only when the OSR process is not completely removed even if the OSR process is repeated a plurality of times (for example, 5 to 10 times) within a predetermined time. Therefore, the low efficiency of stopping the crusher can be avoided once the clamping phenomenon occurs, and the working efficiency of the crusher is improved.
For this purpose, the control processor 3 stores therein a preset overload current value (Ao), a preset number of times of overload release processing, and a preset time of overload release processing
The control processor 3 may further include a counter (not shown) configured to count the number of times of the overload release process, and when the number of times of the overload release process counted in the counter reaches a preset number within a preset time, the inverter 2 may stop the driving motor 1 to terminate the overload release process.
The control processor 3 further includes a timer (not shown) for counting the time of the overload release process, and the control processor 3 resets the number of times in the counter to zero when the time accumulated in the timer reaches a preset time.
In order to be suitable for achieving the purpose of the present invention, the pulverizer according to the present invention specifically performs the OSR process shown in fig. 3 by the control processor 3. The OSR process is described in detail below with reference to the drawings.
As shown in FIG. 3, the OSR processing of the present embodiment is performed as follows
When the control processor 3 is powered on, the OSR process is started (step S100), and at this time, the crusher is stopped (step S101).
Next, in step S102, the control processor 3 determines whether or not the crusher can start operation and activation, for example, whether or not the object to be crushed has started to be fed into the hopper (for example, by detecting the object in the hopper with a sensor), and when it is determined that the crusher does not need to be activated (that is, NO in step S102), the crusher continues to be in a stopped state (step S101); when it is determined that the crusher can be started (i.e., YES in step S102), the OSR process flag is set OFF (step S103), and then the cumulative number of OSR processes (R) in the counter is set to zero and the cumulative time of OSR processes in the timer is also set to zero (step S104). This step is to reset all the parameters of the OSR process before the shredder starts up so that a completely new OSR process can be performed. After all the parameters of the OSR process have been reset, in step S105, the control processor 3 controls the inverter 2 to rotate the drive motor 1 in the forward rotation frequency, that is, the crusher starts to be started, the object in the hopper is sent to the crushing box, and the object is crushed by the crushing blade driven to rotate by the drive motor 1 in the crushing box.
After the start of the pulverization, the control processor 3 executes step S106, and at step S106, the control processor 3 determines whether or not the drive current value (Ac) at the inverter 2 is equal to or higher than a preset overload current value (Ao), and also determines whether or not the state where the drive current value (Ac) at the inverter 2 is equal to or higher than the preset overload current value (Ao) continues for a preset time (t 1). That is, in this step, it is determined whether the above two conditions are satisfied at the same time, and when it is determined that the driving current value (Ac) of the inverter 2 is equal to or greater than the preset overload current value (Ao), it is then determined whether the driving current value (Ac) of the inverter 2 is equal to or greater than the preset overload current value (Ao) and whether the duration of the duration has elapsed for the preset time (t 1). The overload current value (Ao) and the preset time (t 1) are preset and stored in the control processor 3. (for example, the preset time may be set to 3 seconds to 10 seconds)
As a result of the determination in step S106, there are three cases, (1) the drive current value (Ac) at the inverter 2 is smaller than the preset overload current value (Ao); (2) the driving current value (Ac) on the frequency converter 2 is greater than or equal to the preset overload current value (Ao), but the duration of the state is not longer than the preset time (t 1), and the driving current value (Ac) on the frequency converter 2 is reduced to be less than the preset overload current value (Ao); (3) the driving current value (Ac) of the frequency converter 2 is greater than or equal to the preset overload current value (Ao), and the duration of the state reaches the preset time (t 1).
Since the drive current value (Ac) of the inverter 2 is not less than or equal to the predetermined overload current value (Ao) only when the crushing blade is stuck to the object and cannot rotate, in the case (1) described above, the control processor 3 determines that the crusher is in a normal crushing state, that is, the determination result of step S106 is NO, and the control processor 3 returns to step S105 to control the inverter 2 to rotate the drive motor 1 in the normal rotation frequency to continue the crushing operation.
In the case (2) described above, although the driving current value (Ac) at the inverter 2 is equal to or greater than the preset overload current value (Ao), the time during which this state continues has not yet elapsed (t 1), the driving current value (Ac) at the inverter 2 is reduced to be less than the preset overload current value (Ao), which indicates that the object is momentarily or temporarily stuck to the crushing blade, and the crusher returns to the normal crushing state, and therefore, in the case (2) described above, the control processor 3 determines that the crusher is in the normal crushing state, that is, the determination result of step S106 is NO, and the control processor 3 returns to step S105, and controls the inverter 2 to rotate the driving motor 1 in the forward rotation frequency to continue the crushing operation.
Since both the cases (1) and (2) are determined that the crusher is in the normal crushing state, the OSR process is not required until the case (3) occurs, that is, the crushing blade of the crusher is locked to the object, and the steps executed by the control processor 3 are always cycled between S105 and S106.
The above-described loop is broken only when the above-described case (3) occurs, that is, for the above-described case (3), the control processor 3 determines that the pulverizer is in the stuck state, that is, the determination result of step S106 is YES, and at this time, it is necessary to perform the OSR process to eliminate the stuck state, and therefore, the control processor 3 first performs step S107 to set the OSR process flag to ON, and then performs step S108 to display the OSR process flag ON the terminal to indicate that the OSR process is in progress.
Then the control processor 3 executes step S109 to cause the timer to start counting the OSR processing time, then the control processor 3 instructs the drive motor 1 to stop the normal rotation by the inverter 2 in step S110, that is, instructs the grinding blade driven by the drive motor 1 to stop the normal rotation, then after the drive motor 1 stops the normal rotation for a predetermined time (in the present embodiment, the predetermined time is set to 2 to 5 seconds) in step S111, the control processor 3 executes step S112 to instruct the inverter 2 to rotate the drive motor 1 in the reverse direction at the reverse frequency for a predetermined time (in the present embodiment, the predetermined time is set to 3 to 10 seconds), that is, instructs the drive motor 1 to start the reverse rotation by the grinding blade driven by the drive motor 1 in the reverse rotation frequency, after the reverse rotation for the predetermined time, the control processor 3 instructs the drive motor 1 to stop the reverse rotation by the inverter 2 in step S113, that is, after the grinding blade driven by the drive motor 1 is stopped from rotating in the reverse direction, the control processor 3 executes step S115 after the drive motor 1 stops rotating in the reverse direction for a predetermined time (in the present embodiment, the predetermined time is set to 2 to 5 seconds), and adds 1 to the cumulative number of OSR processing in the counter, which indicates that the OSR processing has been performed once again in addition to the number of OSR processing performed previously, and if only 1 OSR processing has been performed after the number of OSR processing has been set to zero in step S104, the cumulative number of OSR processing at this time becomes 1 (i.e., 0+ 1).
Next, the control processor 3 executes step S116 to determine whether or not the cumulative number of OSR processes reaches a preset number (i.e., a preset upper limit value in fig. 3) (in the present embodiment, the preset number is set to 5 to 10), and when the cumulative number of OSR processes does not reach the preset number, the determination result is NO, and the control processor 3 executes step S117 to control the inverter 2 to rotate the drive motor 1 forward again at the forward rotation frequency, that is, to continue to rotate the crushing blade driven by the drive motor 1 forward to perform normal crushing.
While the crushing blade continues to rotate forward for normal crushing, the control processor 3 executes step S118, the content of this step is exactly the same as that of the above step S106, and is also divided into three types of determination results, a detailed description of the determination contents thereof is omitted here, and when the determination result is the same as the case (1) or (2) in step S106, the control processor 3, as a result of the determination in step S118 being NO, executes step S119, whether the accumulated time in the timer reaches a preset time (in the present embodiment, the preset time is set to be 5 minutes to 10 minutes) is determined, and when the determination result is that the accumulated time in the timer does not reach the preset time, that is, when the determination result is NO, the control processor 3 returns to step S117, in which the inverter 2 is controlled to rotate the drive motor 1 in the normal rotation frequency again, that is, the grinding blade driven by the drive motor 1 continues to rotate in the normal rotation to perform the normal grinding.
When the determination result in step S118 is the same as in the case (3) in step S106 described above, i.e., YES, the control processor 3 returns to perform steps S110 to S117, as can be seen from fig. 3, if the crushing blade is locked in a short time, the control processor 3 will loop between step S110 and step S118, and each loop will increase the number of OSR treatment in the counter by 1 time in step S115, and when the number of OSR treatment in the counter reaches the preset number, that is, when the determination result in the step S116 is YES, the explanation is made as to the case where the fact that the grinding blade is locked cannot be completely solved even if the OSR processing is continuously performed a plurality of times, and in this case, the control processor 3 executes the step S120, an operation abnormality is displayed on the terminal, and then step S121 is executed to stop the operation, i.e., stop the pulverizer, thereby ending the entire control (step S122). At this time, the shredder can be restarted only after the situation that the shredding blade is locked is completely solved by manual work (step S100 is executed again).
In the OSR processing step, the overload current value, the preset time, the preset number and other relevant parameters can be adjusted and preset according to the actual use condition and the crushed object.
Meanwhile, the OSR processing step is an embodiment of the present invention, and the order of the steps is not particularly limited as long as the gist of the present invention is not affected.
For example, in the present invention, the relevant parameters are reset in step S103 and step S104, but the execution order is not particularly limited. And, steps S107 to S109 are status settings at the start of the OSR process, and the order of execution thereof is also not particularly limited.
In order to be suitable for achieving another object of the present invention, the shredder according to the present invention specifically executes the Power Saving (Power Saving) process, which is abbreviated as PS process, as shown in fig. 4 by the control processor 3.
The PS process according to the present invention is a process of determining the operation state of the crusher by detecting the drive current value (Ac) from the inverter 2, similarly to the OSR process described above. The control processor 3 stores a preset energy-saving current value (Ae), and when the crusher is in a normal mode operation, and the control processor 3 determines that the detected actual driving current value (Ac) from the frequency converter 2 is less than or equal to the preset energy-saving current value (Ae) and the situation lasts for a preset time, the control processor 3 switches the operation mode of the crusher to an energy-saving operation mode, specifically, the driving motor 1 is rotated in an energy-saving mode through the frequency converter 2 at an energy-saving mode rotation frequency, so that energy consumption is saved. In addition, the control processor 3 further stores a preset PS mode release current value (Aw), and when the control processor 3 determines that the detected actual driving current value (Ac) from the inverter 2 is equal to or greater than the preset PS mode release current value (Aw) while the pulverizer is in the PS mode operation, the control processor 3 switches the operation mode of the pulverizer to the normal operation mode, specifically, the driving motor 1 is rotated in the normal operation mode at the normal operation mode rotation frequency by the inverter 2 to resume the normal pulverizing and cutting operation.
The PS process of the present embodiment will be described in detail below with reference to fig. 4
As shown in fig. 4, when the control processor 3 starts the PS process (S200), the crusher is in the normal mode operation state (S201).
The control processor 3 monitors whether the actual driving current value (Ac) of the frequency converter 2 is less than or equal to the preset energy-saving current value (Ae) in real time, and continues for a preset time, that is, executes step S202. It can be seen that the control processor 3 determines YES only when the control processor 3 detects that the driving current value (Ac) of the inverter 2 is less than or equal to the preset energy saving current value (Ae) and the state continues for the preset time, and then proceeds to execute the next step S203. That is, even if the control processor 3 detects that the driving current value (Ac) of the inverter 2 is equal to or less than the preset energy-saving current value (Ae), but this state does not continue for the preset time (for example, the preset time may be set to 5 seconds to 10 seconds), the control processor 3 determines NO and returns to step S201 to continue the operation in the normal driving mode (for example, the operation frequency of the inverter 2 is 60 Hz).
If the determination result is that the driving current value (Ac) of the inverter 2 is less than or equal to the preset energy saving current value (Ae), that is, the determination result of step S202 is YES, it indicates that there is no object entering the crushing box of the crusher for a while. At this time, the control processor 3 switches the crusher operation mode to the energy saving operation mode, specifically, the inverter 2 rotates the drive motor 1 at the energy saving mode rotation frequency to save energy, that is, the inverter 2 starts to operate the drive motor 1 at the PS mode frequency (for example, 30 Hz), and the operation of step S203 is performed. And, a PS mode icon is displayed on the display and/or the remote terminal (step S204 is executed) to indicate that the PS mode operation is currently being performed.
In the PS mode frequency operation process, the control processor 3 monitors whether the driving current value (Ac) of the frequency converter 2 is greater than or equal to the preset PS mode release current value (Aw) in real time, i.e., executes step S205.
If the driving current value (Ac) is detected to be smaller than the preset energy saving mode rotation canceling current value (Aw), that is, if the determination result of step S205 is NO, it indicates that NO object is present in the crushing box of the crusher, and the control processor 3 automatically returns to execute step S203 to continue the operation at the PS mode frequency (30 Hz).
If the driving current value (Ac) is detected to be greater than or equal to the preset energy saving mode rotation canceling current value (Aw), that is, if the determination result of the step S205 is YES, it indicates that the object is entering the crushing box of the crusher. At this time, the control processor 3 adjusts the frequency of the driving motor 1 through the frequency converter 2 (e.g., from 30Hz to 60 Hz), and allows the frequency converter 2 to rotate the driving motor 1 in the normal mode (i.e., execute step S206). And, the PS icon is switched to normal operation (i.e., step S207 is executed) in the display and/or the remote terminal, thereby indicating that the operation is currently in the normal mode. And ends the PS process this time (i.e., performs step S208) to wait for the next judgment operation.
In the PS mode step, the energy saving current value (Ae), the preset time, the PS mode release current value (Aw), and other relevant parameters can be set as appropriate according to the actual use situation, as in the OSR processing step of the present embodiment.
Meanwhile, the above-mentioned PS processing steps are not particularly limited as far as the gist of the present invention is not concerned.
For example, the execution order of step S203 and step S204 and the execution order of step S206 and step S207 may be interchanged according to actual needs.
In the present embodiment, after the control processor 3 executes step S207, it executes step S208 to end the PS process. However, it is also possible that the control processor 3, after executing step S207, returns to execute step S201 to allow the PS process to be repeatedly continued during the operation of the crusher, i.e., to execute step S208 only when the operation of the crusher is stopped.
The invention can prevent the influence of the repeated occurrence of the clamping phenomenon of the object to be crushed on the crushing efficiency and prolong the service life of the driving motor. On the basis, the energy consumption of the pulverizer can be saved during idling.
The gist of the present invention has been described in detail in the above description, but the description is only illustrative of one preferred embodiment of the present invention, and the embodiment of the present invention is not limited to the above description, and the increase, decrease, and simple replacement of the related components and/or structures are within the scope of the present invention without departing from the design gist of the present invention.
Claims (6)
1. A crusher for crushing an object with a crushing blade, comprising:
a drive motor for driving the crushing blade to rotate in the forward and reverse directions;
a frequency converter for controlling the rotation speed and the rotation direction of the drive motor by converting the frequency; and
a control processor for controlling the frequency converter;
the control processor repeatedly performs the following overload relief processing: that is, the control processor detects that the driving current value of the frequency converter is greater than or equal to a preset overload current value in the process of enabling the driving motor to rotate forwards at the forward rotation frequency through the frequency converter, and stops the driving motor through the frequency converter after the driving motor continues for a preset time, enables the driving motor to rotate backwards for the preset time through the frequency converter at the reverse rotation frequency after the driving motor stops for the preset time, and enables the driving motor to rotate forwards at the forward rotation frequency through the frequency converter after the driving motor stops for the preset time.
2. The pulverizer of claim 1,
the control processor also comprises a counter for counting the number of times of the overload relieving treatment in an accumulated way, when the number of times of the overload relieving treatment in the counter reaches a preset number, the driving motor is stopped by the frequency converter, and the overload relieving treatment is stopped.
3. The pulverizer of claim 2,
the control processor also comprises a timer for timing the time of the overload relieving processing, and when the time accumulated in the timer reaches the preset time, the times in the counter return to zero.
4. The pulverizer of any one of claims 1 to 3,
the frequency converter adopts a sensorless vector control mode.
5. The pulverizer of any one of claims 1 to 3,
the control processor also repeats the following energy saving processing: that is, the control processor detects that a driving current value of the inverter is below a preset energy-saving current value in a process of normally rotating the driving motor by the inverter at a normal mode rotation frequency, and after the driving current value lasts for a preset time, the driving motor is rotated in an energy-saving mode rotation frequency by the inverter; and in the energy-saving rotation process, when the driving current value of the frequency converter is detected to be more than a preset energy-saving mode rotation release current value, the frequency converter enables the driving motor to normally rotate again at the normal mode rotation frequency.
6. The pulverizer of claim 4,
the control processor also repeats the following energy saving processing: that is, the control processor detects that a driving current value of the inverter is below a preset energy-saving current value in a process of normally rotating the driving motor by the inverter at a normal mode rotation frequency, and after the driving current value lasts for a preset time, the driving motor is rotated in an energy-saving mode rotation frequency by the inverter; and in the energy-saving rotation process, when the driving current value of the frequency converter is detected to be more than a preset energy-saving mode rotation release current value, the frequency converter enables the driving motor to normally rotate again at the normal mode rotation frequency.
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| CN202010016574.3A CN113097974A (en) | 2020-01-08 | 2020-01-08 | Disintegrating machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010016574.3A CN113097974A (en) | 2020-01-08 | 2020-01-08 | Disintegrating machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115178369A (en) * | 2022-06-30 | 2022-10-14 | 宁波爱乐吉电动工具股份有限公司 | Control method and system of pulverizer |
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