A crusher control method and system

Abstract

The invention relates to the technical field of pulverizers, and in particular to a pulverizer control method and system; wherein step S1 is to start a pulverizer motor; step S2 is to determine the load state of the pulverizer motor; step S3 is to determine whether a normal load is overloaded; step S4 is to start reverse protection; the pulverizer control system comprises a PC terminal, a communication module, a control module and an operation module, the control module is electrically connected to the communication module and the operation module respectively; the PC terminal is electrically connected to the communication module, and is used to transmit set parameters to the control module through the communication module, and the control module detects, determines and controls the operation module; the processing method when the motor is blocked is made simpler, the processing steps are reduced, and the pulverizing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pulverizers, and in particular to a pulverizer control method and system. Background Art

[0002] The fruit industry occupies an important position in my country's agricultural production. The fruit industry not only drives economic development, but also improves people's living standards. The development and utilization of pruned branches has extremely broad prospects. Therefore, using relevant equipment to cut, crush and further process the pruned branches to turn them into usable energy will greatly promote the sustainable development of my country's ecological agriculture. Organic fertilizer made from crushed fruit tree branches can be directly covered on the ground of the orchard to increase the organic matter in the soil and reduce soil erosion.

[0003] The crusher in the prior art is equipped with a forward and reverse switch and an overcurrent protector. When working, it crushes branches by starting forward rotation. When crushing branches with higher hardness, overload and stalling will occur. The large current generated during the stalling will trigger the overcurrent protector. At the same time, the overcurrent protector will exit the protection state and cut off the power of the equipment to protect the crusher motor. To restore the power supply of the equipment, the overcurrent protector must be restored first. At this time, it is necessary to wait for a certain period of time before the overcurrent protector can be manually restored through manual operation. After the equipment is powered on, if the stalled branches are to be removed, the reverse switch must be activated multiple times to remove the stalled branches. This stall processing method is cumbersome and complicated. There is an urgent need for a crusher control method and system that has a simple processing process when the motor is overloaded and stalled and improves the working efficiency of the crusher. Summary of the invention

[0004] In order to solve the defects of the above-mentioned technology, the present invention provides a pulverizer control method which has a simple processing process when the motor is overloaded and stalled and improves the working efficiency of the pulverizer.

[0005] A pulverizer control method comprises the following steps:

[0006] S1, start the grinder switch, the grinder motor starts to rotate forward, and the load duration V is reset;

[0007] S2, the data acquisition module collects the actual working current Y of the grinder motor, and judges whether the grinder motor is overloaded by comparing it with the current interval Z of the grinder motor under load. If the actual working current Y is within the current interval Z of the grinder motor under load, it is judged that the grinder motor is under normal load and the process goes to step S3; if the actual working current Y exceeds the current interval Z of the grinder motor under load, it is judged that the grinder motor is overloaded and the process goes to step S4, and the current interval Z of the grinder motor under load is the current interval of the grinder motor under normal load;

[0008] S3, the grinder motor works under normal load, the data acquisition module collects the grinder motor load duration V, the grinder motor load duration V≥ grinder motor limit load time W, the motor is overloaded and enters step S4, the grinder motor limit load time W is the limit time that the grinder motor can withstand when working under normal load;

[0009] S4. Start the grinder reverse protection. After the grinder motor reverses for 0.5S, the grinder switch is reset and the grinder stops working.

[0010] Advantages and beneficial effects of the method of the present invention: The present invention provides a pulverizer control method with a simple processing process when the motor is overloaded and stalled and improves the working efficiency of the pulverizer. Step S1, start the pulverizer switch, the pulverizer motor starts to rotate forward, and the load duration V is reset at the same time. Each time the pulverizer is started, the load duration V is reset and the load duration is recalculated. When the load duration reaches the overload limit time, the device will enter the reverse protection program to ensure the overall operating time of the pulverizer. If the overload of the pulverizer motor is not considered, continuous overload operation may damage the motor, and repairing the pulverizer motor will increase the working time and reduce the working efficiency; Step S2, the data acquisition module collects the pulverizer motor The actual working current Y is compared with the current interval Z of the grinder motor under load to determine whether the grinder motor is overloaded. If the actual working current Y is within the current interval Z of the grinder motor under load, it is determined that the grinder motor is under normal load and the process goes to step S3; if the actual working current Y exceeds the current interval Z of the grinder motor under load, it is determined that the grinder motor is overloaded and the process goes to step S4. The current interval Z of the grinder motor under load is the current interval when the grinder motor is under normal load. The actual working current Y of the grinder motor is collected through the data acquisition module. The change of the current value determines whether the grinder motor is in an overload state. The actual working current Y of the grinder motor is If the actual working current Y exceeds the current interval Z of the grinder motor load operation, it is determined that the grinder motor is overloaded and the process goes to step S4 to start the reverse protection of the grinder motor. The current interval Z of the grinder motor load operation can be set by combining the rated parameters of the motor with actual working experience, thereby reducing the number of manual judgments in actual work and increasing the working efficiency of the grinder. Step S3, the grinder motor is working under normal load, and the data acquisition module collects the grinder motor load duration V. The grinder motor load duration V ≥ the grinder motor limit load time W. The motor is overloaded and the process goes to step S4 to grind. The maximum load time W of the crusher motor is the maximum time that the crusher motor can withstand when working under normal load. The setting of the maximum load time W of the crusher motor can effectively protect the motor and prevent the reduction of the motor life or damage to the motor caused by overload of the crusher motor; step S4, start the crusher reverse protection, the crusher motor automatically reverses for 0.5S and then the crusher switch is reset, the crusher stops working, the crusher automatically starts the reverse protection, the crusher motor reverses for 0.5S and then the crusher switch is reset, and the work can be restarted by restarting the switch. The operation is simple and no waiting is required, which reduces the time waste caused by repeatedly turning on the reverse switch and waiting for the overcurrent protector to be restored, reduces manual operation and improves the working efficiency of the crusher.

[0011] Preferably, the step S2 determines that the pulverizer motor is overloaded and before entering the step S4, the number of reverse rotations of the pulverizer motor needs to be determined, including:

[0012] S21, compare the initial reversal number N of the pulverizer motor with the limit reversal number J of the pulverizer motor to determine whether the stall of the pulverizer motor can be restored. If the initial reversal number N of the pulverizer motor is greater than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor cannot be restored, and the pulverizer switch is reset; if the initial reversal number N of the pulverizer motor is less than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor can be restored, and the process goes to step S22; the initial reversal number N of the pulverizer motor is the number of times the pulverizer motor enters the reversal protection, and the initial reversal protection number is set to zero. Each subsequent reversal protection of step S4 is entered, the initial reversal number N+1; the limit reversal number J of the pulverizer motor is the number of reversals allowed for the pulverizer motor;

[0013] S22, the data acquisition module collects the actual overload time O of the grinder motor. When the actual overload time O of the grinder motor is greater than or equal to the grinder motor overload limit time Q, the process proceeds to step S4; if the actual overload time O of the grinder motor is less than the grinder motor overload limit time Q, the grinder motor continues to work in overload mode; the grinder motor overload limit time Q is the duration allowed when the grinder is overloaded. In this way, step S2 determines whether the grinder motor is overloaded and needs to determine the number of reversals of the grinder motor before entering step S4; step S21 determines whether the grinder motor is in an irrecoverable state of stalling by setting the maximum number of reversals J of the grinder motor and comparing the maximum number of reversals J of the grinder motor with the initial number of reversals N of the grinder motor; partial overload stalling can be directly crushed by restarting the grinder motor after reversing, which is a recoverable stalling, reducing the time waste caused by the traditional grinder stopping to take out the wood when it is stalled, and improving the crushing efficiency of the grinder; step S22 protects the grinder by collecting the practical overload time O of the grinder motor and comparing the overload limit time Q of the grinder motor. Generally, overloaded grinders can be directly crushed by increasing the current and increasing the power. Short-term overload will not cause excessive damage to the grinder motor, but long-term overload may damage the motor. Therefore, the overload limit time of the grinder motor is set to protect the grinder motor and increase the service life of the grinder motor.

[0014] Preferably, the current interval Z of the grinder motor load operation includes the grinder motor normal load current interval Z1, the grinder motor low overload current interval Z2, the grinder motor medium overload current interval Z3 and the grinder motor high overload current interval Z4, and the grinder motor overload limit time Q includes the low overload limit time Q1, the medium overload limit time Q2 and the high overload limit time Q3. In this way, the current interval Z of the grinder motor load operation is divided into three states. The first is the normal load current interval Z1 of the grinder motor. If the actual working current Y of the grinder motor exceeds the normal load current interval Z1 of the grinder motor, it is judged to be overloaded. If the actual working current Y of the grinder motor is within the normal load current interval Z1 of the grinder motor, it is judged to be normal load operation; wherein the situations exceeding the normal load current interval Z1 of the grinder motor are divided into three types: 1. The grinder motor low overload current interval Z2. In this interval, the overload of the grinder motor is slight, generally 20% of the rated power, corresponding to the low overload limit time Q1. The data acquisition module collects the actual overload time O of the grinder motor. When the actual overload time O of the grinder motor is greater than or equal to the low overload limit time Q1, step S4 is entered; 2. The overload current interval Z2 of the grinder motor. The third is the medium overload current interval Z3 of the pulverizer motor. In this interval, the overload condition of the pulverizer motor is serious, generally 20%-100% of the rated power, corresponding to the medium overload limit time Q2. When the data acquisition module collects the actual overload time O of the pulverizer motor, when the actual overload time O of the pulverizer motor is greater than or equal to the medium overload limit time Q2, enter step S4; the third is the medium overload current interval Z3 of the pulverizer motor. In this interval, the overload condition of the pulverizer motor is serious, generally more than 100% of the rated power, corresponding to the high overload limit time Q3. When the data acquisition module collects the actual overload time O of the pulverizer motor, when the actual overload time O of the pulverizer motor is greater than or equal to the high overload limit time Q3, enter step S4; in this way, the respective overload limit times can be limited according to different overload conditions, and the motor of the pulverizer can be protected from overheating by limiting the duration of the overload state of the pulverizer motor.

[0015] Preferably, step S4 includes: when the motor load duration V≧1min, the initial reversal times N of the grinder motor are reset. In this way, when the motor load duration is greater than or equal to 1min, the initial reversal times N of the grinder motor are reset, and when the motor is overloaded again and enters the reversal protection, the initial reversal times N of the grinder motor will be accumulated again, and it is determined that the overload phenomenon has been eliminated, and the motor enters the normal load working state.

[0016] Preferably, the method of clearing the initial number of reverse rotations N of the pulverizer motor also includes directly cutting off the power supply. This arrangement gives the user a certain degree of subjective judgment. When the user feels that the preset limit number of reverse rotations J of the pulverizer motor is not suitable for the current object, the pulverization can be performed again by cutting off the power supply.

[0017] Preferably, the starting mode of the pulverizer motor forward rotation and the starting mode of the pulverizer reverse rotation are both soft starting. In this way, the soft starting has the advantages of small starting current, stable and reliable starting speed, small impact on the power grid, etc., which reduces the impact force on the equipment during starting and reduces the damage to the equipment.

[0018] In order to solve the defects of the above-mentioned technology, the present invention provides a grinder control system which has a simple processing process when the motor is overloaded and stalled and improves the working efficiency of the grinder; a grinder control system, including a PC end, a communication module, a control module and an operation module, the control module is electrically connected to the communication module and the operation module respectively; the PC end is electrically connected to the communication module, the PC end is used to set parameters, the parameters include the current range Z of the grinder motor load operation, the duration Q of the grinder motor overload, the limit load time W of the grinder motor, the limit reversal number J of the grinder motor and the initial reversal number N of the grinder motor, and the parameters are transmitted to the control module through the communication module; the control module is used to control the operation of the operation module.

[0019] The advantages and beneficial effects of the system of the present invention are as follows: a grinder control system is provided which has a simple processing process when a motor is overloaded and stalled and improves the working efficiency of the grinder. Parameters are set on the PC side, and the parameters are set according to the rated power of the motor and the use environment. The parameters include the current range Z of the grinder motor under load, the duration Q of the grinder motor overload, the limit load time W of the grinder motor, the limit reversal number J of the grinder motor and the initial reversal number N of the grinder motor. The parameters are transmitted to the control module through the communication module. The control module judges the state of the grinder motor by comparing the preset values ​​according to the collected data, determines the working state of the operation module, specializes the use of the grinder, sets parameters for a type of wood, and then detects, judges and controls the operation of the operation module through the control module. Too much human judgment is not required in the process, the operation engineering is simple and the working efficiency of the grinder is improved.

[0020] Preferably, the control module includes a data acquisition module and a judgment module electrically connected to the data acquisition module, the data acquisition module is used to collect the actual current Y of the crusher motor when it is working and the load duration V of the crusher motor and feed them back to the judgment module, the judgment module is used to compare whether the actual current Y of the crusher motor is within the preset current interval Z of the crusher motor load operation, and judge whether the crusher motor is overloaded; compare the load duration V of the crusher motor and the limit load time W of the crusher motor, and judge whether the normal load is overloaded; the control module also includes a motor controller, which is electrically connected to the crusher motor and is used to drive and control the crusher motor to rotate forward or reverse; the operation module includes a motor module, a deceleration module and a working module; the motor controller drives and controls the motor module, and is used for the crusher motor to output a high speed; the deceleration module is electrically connected to the motor module and the working module, respectively, and is used to reduce the high speed output by the motor module to the low speed required for work; the working module is used to crush wood. With this arrangement, real-time data of the motor current is collected and fed back to the judgment module. The judgment module compares the corresponding real-time data with the corresponding preset data to determine the next direction of the equipment. The judgment module can be directly connected to the motor controller. After the judgment module gives an instruction, the motor controller is directly controlled to realize the forward rotation and reverse rotation of the grinder motor. At the same time, the high speed output by the motor module can be reduced to a low speed to increase the torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A control flow chart of a pulverizer control method;

[0022] Figure 2 is a detailed control flow chart of a pulverizer control method;

[0023] Figure 3 The schematic diagram of a pulverizer control system is shown in FIG.

[0024] Figure 4 It is a detailed schematic diagram of a pulverizer control system;

[0025] Figure 5 The present invention is a specific implementation flow chart of a pulverizer control method.

[0026] 101, PC terminal; 102, communication module; 103, control module; 104, operation module; 1031, data acquisition module; 1032, judgment module; 1033, motor controller; 1041, motor module; 1042, deceleration module; 1043, working module. DETAILED DESCRIPTION

[0027] like Figure 1As shown, a pulverizer control method provided by an embodiment of the present invention comprises the following steps:

[0028] S1, start the grinder switch, the grinder motor starts to rotate forward, and the load duration V is reset;

[0029] S2, the data acquisition module collects the actual working current Y of the grinder motor, and judges whether the grinder motor is overloaded by comparing it with the current interval Z of the grinder motor under load. If the actual working current Y is within the current interval Z of the grinder motor under load, it is judged that the grinder motor is under normal load and the process goes to step S3; if the actual working current Y exceeds the current interval Z of the grinder motor under load, it is judged that the grinder motor is overloaded and the process goes to step S4, and the current interval Z of the grinder motor under load is the current interval of the grinder motor under normal load;

[0030] S3, the grinder motor works under normal load, the data acquisition module collects the grinder motor load duration V, the grinder motor load duration V≥ grinder motor limit load time W, the motor is overloaded and enters step S4, the grinder motor limit load time W is the limit time that the grinder motor can withstand when working under normal load;

[0031] S4. Start the grinder reverse protection. The grinder motor automatically reverses for 0.5 seconds, then the grinder switch resets and the grinder stops working.

[0032] Step S1, start the grinder switch, the grinder motor starts to rotate forward, and the load duration V is reset. Each time the grinder is started, the load duration V is reset and the load duration is recalculated. When the load duration reaches the overload limit time, the equipment will enter the reverse protection program to ensure the overall operation time of the grinder. If the grinder motor overload is not considered, continuous overload operation may damage the motor, and repairing the grinder motor will increase the working time and reduce work efficiency.

[0033] Step S2, the data acquisition module collects the actual working current Y of the grinder motor, and compares it with the current interval Z of the grinder motor under load to determine whether the grinder motor is overloaded. If the actual working current Y is within the current interval Z of the grinder motor under load, it is determined that the grinder motor is under normal load and the process goes to step S3; if the actual working current Y exceeds the current interval Z of the grinder motor under load, it is determined that the grinder motor is overloaded and the process goes to step S4. The current interval Z of the grinder motor under load is the current interval of the grinder motor under normal load. The actual working current Y of the grinder motor is collected through the data acquisition module. , judge whether the grinder motor is in an overload state by the change of the current value. If the actual working current Y of the grinder motor is within the current interval Z of the grinder motor load operation, it is judged that the grinder motor is working under normal load and enters step S3 to perform normal load operation; if the actual working current Y exceeds the current interval Z of the grinder motor load operation, it is judged that the grinder motor is overloaded and enters step S4 to start the reverse protection of the grinder motor. The current interval Z of the grinder motor load operation can be set by the rated parameters of the motor and combined with actual working experience, thereby reducing the number of manual judgments in actual work and increasing the working efficiency of the grinder.

[0034] Step S3, the grinder motor works under normal load, and the data acquisition module collects the grinder motor load duration V. The grinder motor load duration V≥the grinder motor limit load time W. The motor is overloaded and enters step S4. The grinder motor limit load time W is the limit time that the grinder motor can withstand when working under normal load. The setting of the grinder motor limit load time W can effectively protect the motor and prevent the grinder motor from being overloaded and causing the motor life to be reduced or the motor to be damaged.

[0035] Step S4, start the reverse protection of the grinder, the grinder motor automatically reverses for 0.5S and then the grinder switch is reset, the grinder stops working, the grinder automatically starts the reverse protection, the grinder motor reverses for 0.5S and then the grinder switch is reset, and the work can be restarted by simply restarting the switch. The operation is simple and does not require waiting, thus reducing the time waste caused by repeatedly inching the reverse switch and waiting for the overcurrent protector to be restored, reducing manual operation and improving the working efficiency of the grinder.

[0036] like Figure 2 As shown, step S2 determines that the grinder motor is overloaded and before entering step S4, the number of reverse rotations of the grinder motor needs to be determined, including:

[0037] S21, compare the initial reversal number N of the pulverizer motor with the limit reversal number J of the pulverizer motor to determine whether the stall of the pulverizer motor can be restored. If the initial reversal number N of the pulverizer motor is greater than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor cannot be restored, and the pulverizer switch is reset; if the initial reversal number N of the pulverizer motor is less than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor can be restored, and the process goes to step S22; the initial reversal number N of the pulverizer motor is the number of times the pulverizer motor enters the reversal protection, and the initial reversal protection number is set to zero. Each subsequent reversal protection of step S4 is entered, the initial reversal number N+1; the limit reversal number J of the pulverizer motor is the number of reversals allowed for the pulverizer motor;

[0038] S22, the data acquisition module collects the actual overload time O of the grinder motor. When the actual overload time O of the grinder motor is greater than or equal to the grinder motor overload limit time Q, the process proceeds to step S4; if the actual overload time O of the grinder motor is less than the grinder motor overload limit time Q, the grinder motor continues to work in overload mode; the grinder motor overload limit time Q is the duration allowed when the grinder is overloaded. In this way, step S2 determines whether the grinder motor is overloaded and needs to determine the number of reversals of the grinder motor before entering step S4; step S21 determines whether the grinder motor is in an irrecoverable state of stalling by setting the maximum number of reversals J of the grinder motor and comparing the maximum number of reversals J of the grinder motor with the initial number of reversals N of the grinder motor; partial overload stalling can be directly crushed by restarting the grinder motor after reversing, which is a recoverable stalling, reducing the time waste caused by the traditional grinder stopping to take out the wood when it is stalled, and improving the crushing efficiency of the grinder; step S22 protects the grinder by collecting the practical overload time O of the grinder motor and comparing the overload limit time Q of the grinder motor. Generally, overloaded grinders can be directly crushed by increasing the current and increasing the power. Short-term overload will not cause excessive damage to the grinder motor, but long-term overload may damage the motor. Therefore, the overload limit time of the grinder motor is set to protect the grinder motor and increase the service life of the grinder motor.

[0039] Normal load often crushes some wet pine trees with a diameter of 30-45mm or wet miscellaneous wood with a diameter of 20-40MM. The normal load current range Z1 of the crusher motor for crushing such objects is generally 12.5-15.5A. Low overload is a relatively light load, which only exceeds the normal load by about 20%. After overloading for a period of time, it can continue to work by starting reverse rotation; medium overload is higher than low overload, mainly exceeding the normal load by 20%-100%. After overloading for a period of time, it can be eliminated by reverse protection to prevent the crusher motor from overloading; and high overload is when encountering objects with hardness beyond the crushing range. The stall caused by the body needs to be removed and cannot be restarted. The main reason is that the equipment must be stopped immediately after exceeding 100% of the normal load, otherwise it is easy to damage the equipment. Specifically, the current interval Z of the grinder motor load is divided into four types; the first is the normal load current interval Z1 of the grinder motor. If the actual working current Y of the grinder motor exceeds the normal load current interval Z1 of the grinder motor, it is judged to be overloaded. If the actual working current Y of the grinder motor is within the normal load current interval Z1 of the grinder motor, it is judged to be normal load operation; among which, the situation exceeding the normal load current interval Z1 of the grinder motor is divided into three types:

[0040] 1. The grinder motor has a low overload current interval Z2. In this interval, the grinder motor has a slight overload condition, which is generally 20% of the rated power. This corresponds to the low overload limit time Q1. The data acquisition module collects the actual overload time O of the grinder motor. When the actual overload time O of the grinder motor is greater than or equal to the low overload limit time Q1, the process proceeds to step S4.

[0041] Second, the grinder motor has a medium overload current interval Z3. In this interval, the grinder motor has a relatively heavy overload condition, generally 20% to 100% of the rated power, corresponding to the medium overload limit time Q2. When the data acquisition module collects the actual overload time O of the grinder motor, when the actual overload time O of the grinder motor is greater than or equal to the medium overload limit time Q2, step S4 is entered;

[0042] 3. The overload current interval Z3 of the grinder motor. In this interval, the overload of the grinder motor is serious, generally more than 100% of the rated power, corresponding to the high overload limit time Q3. When the data acquisition module collects the actual overload time O of the grinder motor, when the actual overload time O of the grinder motor is greater than or equal to the high overload limit time Q3, it enters step S4; in this way, the respective overload limit times can be limited according to different overload conditions, and the grinder motor can be protected from overheating by limiting the duration of the overload state of the grinder motor.

[0043] This method does not require separate jogging or starting of the reverse switch. When the crusher is overloaded and blocked, the equipment will automatically stop and start reverse protection. After reversing for 0.5S, that is, after a total of 1S of operation, the power will be cut off automatically. At this time, just restart the start switch to resume forward operation. General overload and blockage can be directly eliminated and continue to work. If the object to be crushed is too hard, the initial reversal number N of the crusher is compared with the preset limit reversal number J of the crusher motor. When the reversal number N exceeds the limit reversal number J of the crusher motor, the equipment will stop running to remind the worker or user to remove the object to continue the crushing work. This method can eliminate most of the blockages and improve the crushing efficiency. When encountering a blockage that cannot be eliminated, there will also be a protection mechanism to prevent damage to the equipment.

[0044] To further optimize the above scheme, the switch used in this method is a two-pole on-off main switch. After the power outage, the two-pole on-off main switch can be turned off and on to resume operation. Only two modes, on and off, are set. When the device reverses due to a stall, the switch can be immediately disconnected. After waiting for a period of time, it only needs to be turned on again. There is no need for excessive manual control operations, and there is no reverse switch like a traditional crusher. When the crusher motor is overloaded and stalled, it will automatically reverse. If the user can take out the wood through manual judgment, the wood can also be taken out directly. The operation is simple.

[0045] To further optimize the above scheme, directly cutting off the power supply can reset the initial reversal times N of the grinder motor to zero, so that the user can make a certain subjective judgment. When the user feels that the preset maximum reversal times J of the grinder motor is not suitable for the current object, the grinder can be crushed again by cutting off the power supply. Because the initial reversal times are reset to zero after cutting off the power supply, it takes 5 seconds to restart, giving the overloaded motor a certain cooling time to prevent long-term overload and damage to the motor, and to prevent the motor from overheating.

[0046] To further optimize the above scheme, the forward and reverse starting modes of the motor are soft starting; soft starting is to reduce the voltage applied to the stator during the starting process of the grinder motor. The grinder motor used in this embodiment is a series-excited motor. The soft starting method is to use a potentiometer to divide the voltage to achieve the effect of voltage reduction. The soft starting has the advantages of small starting current, stable and reliable starting speed, and small impact on the power grid, which reduces the impact force on the equipment during starting and reduces damage to the equipment.

[0047] like Figure 2The above-mentioned, a pulverizer control system comprises a PC terminal 101, a communication module 102, a control module 103 and an operation module 104, wherein the control module 103 is electrically connected to the communication module 102 and the operation module 104 respectively; the PC terminal 101 is electrically connected to the communication module 102, and is used to transmit the set parameters, i.e., the current interval Z of the pulverizer motor load operation, the overload duration Q, the load duration W, the limit reversal number J of the pulverizer motor and the initial reversal number N of the pulverizer motor to the control module 103 through the communication module 102 connected to the control module 103; the communication module 102 here comprises a communication line and a communication interface, which can be carried out through 485 communication or 232 communication protocol, and the process is simple.

[0048] like Figure 3 To further optimize the above scheme, the control module 103 includes a data acquisition module 1031 and a judgment module 1032 electrically connected to the data acquisition module 1031. The data acquisition module 1031 is used to collect the actual current Y and load duration V when the motor is working and feed them back to the judgment module 1032. The judgment module 1032 is used to compare whether the actual current Y is within the preset current interval Z of the grinder motor load to judge whether the motor is overloaded; compare the load duration V and the maximum load time W of the grinder motor to judge whether the normal load is overloaded; collect real-time data of the motor current and feed it back to the judgment module 1032. The judgment module 1032 compares the corresponding real-time data with the corresponding preset data to judge the next step of the device.

[0049] To further optimize the above scheme, the control module 103 also includes a motor controller 1033, which is used to drive and control the pulverizer motor to rotate forward or reverse. In this way, the judgment module 1032 can be directly connected to the motor controller 1033, and the judgment module 1032 can directly control the motor controller 1033 to realize the forward rotation of the pulverizer motor and the reverse rotation of the pulverizer motor after the instruction is issued.

[0050] To further optimize the above scheme, the operation module 104 includes a motor module 1041, a deceleration module 1042 and a working module 1043; the control module 103 drives and controls the motor module 1041, so as to output a high speed (20,000 rpm); the deceleration module 1042 is electrically connected to the motor module 1041 and the working module 1043, respectively, and is used to reduce the high speed (20,000 rpm) output by the motor module 1041 to the low speed (40 rpm) required for work; the working module 1043 is used to crush rod-like objects; reducing the high speed output by the motor module 1041 to a low speed can increase the torque.

[0051] like Figure 5 As shown, one embodiment of the present invention is: setting the normal load current interval Z1 of the grinder motor to 12.5A-15.5A, the low overload current interval Z2 of the grinder motor to 15.5A-18A, the medium overload current interval Z3 of the grinder motor to 18A-30A, the high overload current interval Z4 of the grinder motor to >30A, the corresponding low overload limit time Q1 to 30S, the medium overload limit time Q2 to 5S and the high overload limit time Q3 to 0S, the load duration W of the grinder motor to 10min, the limit reversal number J of the grinder motor to 3 times and the initial reversal number N of the grinder motor to 0 times, and transmitting the data to the control module 103 via RS485 communication. The power supply is turned on. The power supply voltage is AC220V, 50HZ. The rated power is 2500W of the series-excited motor. The two-pole on-off switch (hereinafter referred to as the switch) is turned on. After the motor is soft-started, it passes through the deceleration module 1042, that is, through the planetary gear reducer, and then reduces the speed from high speed (20000 rpm) to low speed (40 rpm). Put the wood into the working module 1043. The specific working conditions are shown in the following table:

[0052]

[0053]

[0054] The actual working current Y of the crusher motor collected by the data acquisition module 1031 is compared with the normal load current range Z1 of the crusher motor to determine whether the motor is overloaded. When crushing wet miscellaneous wood with a diameter of 20-40mm or wet pine wood with a diameter of 30-45mm, the actual working current Y is between 12.5-15.5A. Within the set current range Z of the crusher motor load, these two types of objects can be successfully crushed; when the normal load time of the crusher motor exceeds the set load duration of 10min, it will enter the reverse protection, start the reverse protection, reverse soft start and reverse for 0.5S, and cut off the power after a total operation of 1S. After the number of reversals N+1, the switch needs to be restarted; after cooling for 5S, turn the switch again to continue working. After 1min of normal load, the initial number of reversals N of the crusher motor is reset, and so on. The crusher motor needs to start the reverse protection every 10min of normal load to cool the machine to increase the service life of the crusher motor. If dry pine wood with a diameter of 30-45mm or dry miscellaneous wood with a diameter of 30-45mm is crushed, the actual working current Y of the crusher motor collected by the data acquisition module 1031 is between 15.5-18A and between 18-30A respectively, which exceeds the normal load current interval Z1 of the crusher motor of 12.5-15.5A, and the motor is determined to be overloaded; at this time, the number of reversals is first determined. If the initial reversal number N of the crusher motor is greater than the limit reversal number J of the crusher motor, that is, N>3, the power is cut off after the reversal protection is started, and the blocked wood needs to be taken out and wait for it to cool down before it can be powered on again; the staff can also observe and judge by experience that when it can be crushed after two more tries, they can also directly disconnect the power supply to clear N, without waiting for too long before powering on; if the actual working current Y of the crusher motor collected by the data acquisition module 1031 is greater than 30A, the reversal protection is immediately turned on, and the power can be turned on again after it cools down. When overloaded, the actual overload time O reaches the overload duration Q (the low overload limit time Q1 is 30S, the medium overload limit time Q2 is 5S), the reverse protection will be activated, the reverse soft start will be started and reverse for 0.5S, and the power will be cut off after a total operation of 1S. The switch needs to be restarted after the initial reversal number N+1 of the crusher motor.

[0055] The various embodiments of this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pulverizer control method, characterized in that: The steps include: S1. Start the grinder switch, the grinder motor starts to rotate forward, and the load duration V is reset to zero; S2, the data acquisition module (1031) collects the actual working current Y of the grinder motor, and compares it with the current interval Z of the grinder motor under load operation to determine whether the grinder motor is overloaded. If the actual working current Y is within the current interval Z of the grinder motor under load operation, it is determined that the grinder motor is under normal load operation and the process proceeds to step S3; if the actual working current Y exceeds the current interval Z of the grinder motor under load operation, it is determined that the grinder motor is overloaded and the process proceeds to step S4, wherein the current interval Z of the grinder motor under load operation is the current interval of the grinder motor under normal load operation; S3, the grinder motor works under normal load, and the data acquisition module (1031) collects the grinder motor load duration V. If the grinder motor load duration V is greater than or equal to the grinder motor limit load time W, the motor is overloaded and the process proceeds to step S4. The grinder motor limit load time W is the limit time that the grinder motor can withstand when working under normal load. S4, start the grinder reverse protection, the grinder motor reverses for 0.5 seconds, the grinder switch resets, and the grinder stops working; The switch is a two-pole on-off main switch. After the power outage, it can be restarted by turning off and on the two-pole on-off main switch. The step S2 determines that the grinder motor is overloaded and before entering step S4, the number of reverse rotations of the grinder motor needs to be determined, including: S21, the initial reversal number N of the pulverizer motor is compared with the limit reversal number J of the pulverizer motor to determine whether the stall of the pulverizer motor can be restored. If the initial reversal number N of the pulverizer motor is greater than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor cannot be restored, and the pulverizer switch is reset; if the initial reversal number N of the pulverizer motor is less than the limit reversal number J of the pulverizer motor, it is determined that the stall of the pulverizer motor can be restored, and the process proceeds to step S22; the initial reversal number N of the pulverizer motor is the number of times the pulverizer motor enters the reversal protection, and the initial reversal protection number is set to zero. Each subsequent reversal protection in step S4 is reset to the initial reversal number N+1; the limit reversal number J of the pulverizer motor is the number of reversals allowed for the pulverizer motor; S22, the data acquisition module (1031) collects the actual overload time O of the grinder motor. When the actual overload time O of the grinder motor is greater than or equal to the grinder motor overload limit time Q, the process proceeds to step S4; if the actual overload time O of the grinder motor is less than the grinder motor overload limit time Q, the grinder motor continues to work under overload; the grinder motor overload limit time Q is the duration allowed when the grinder is overloaded; The forward starting mode and the reverse starting mode of the grinder motor are both soft starting, and the soft starting is to reduce the voltage applied to the stator during the starting process of the grinder motor.

2. A pulverizer control method according to claim 1, characterized in that: The current interval Z of the grinder motor load operation includes the normal load current interval Z1 of the grinder motor, the low overload current interval Z2 of the grinder motor, the medium overload current interval Z3 of the grinder motor and the high overload current interval Z4 of the grinder motor, and the overload limit time Q of the grinder motor includes the low overload limit time Q1, the medium overload limit time Q2 and the high overload limit time Q3.

3. A pulverizer control method according to claim 1, characterized in that: Step S4 includes: if the motor load duration V is greater than or equal to 1 min, the initial reverse rotation times N of the grinder motor are reset to zero.

4. A pulverizer control method according to claim 3, characterized in that: The method of clearing the initial reverse number N of the grinder motor also includes directly cutting off the power supply.

5. A pulverizer control system comprising the pulverizer control method according to any one of claims 1 to 4, characterized in that: The invention comprises a PC terminal (101), a communication module (102), a control module (103) and an operation module (104), wherein the control module (103) is electrically connected to the communication module (102) and the operation module (104) respectively; the PC terminal (101) is electrically connected to the communication module (102); the PC terminal (101) is used to set parameters, wherein the parameters include the current interval Z of the grinder motor load operation, the grinder motor overload limit time Q, the grinder motor limit load time W, the grinder motor limit reversal number J and the grinder motor initial reversal number N, and the parameters are transmitted to the control module (103) through the communication module (102); and the control module (103) is used to control the operation of the operation module (104).

6. A pulverizer control system according to claim 5, characterized in that: The control module (103) includes a data acquisition module (1031) and a judgment module (1032) electrically connected to the data acquisition module (1031). The data acquisition module (1031) is used to collect the actual current Y of the pulverizer motor when it is working and the load duration V of the pulverizer motor and feed them back to the judgment module (1032). The judgment module (1032) is used to compare whether the actual current Y of the pulverizer motor is within a preset current interval Z of the pulverizer motor load operation to judge whether the pulverizer motor is overloaded; and compare the load duration V of the pulverizer motor with the limit load time W of the pulverizer motor to judge whether the normal load is overloaded. The control module (103) also includes a motor control module (1031). The motor controller (1033) is electrically connected to the grinder motor and is used to drive and control the grinder motor to rotate forward or reverse; the operation module (104) includes a motor module (1041), a speed reduction module (1042) and a working module (1043); the motor controller (1033) drives and controls the motor module (1041) so that the grinder motor outputs a high speed; the speed reduction module (1042) is electrically connected to the motor module (1041) and the working module (1043) respectively, and is used to reduce the high speed output by the motor module (1041) to a low speed required for operation; the working module (1043) is used to grind wood.

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