Crusher overheating protection method realized through algorithm and crusher

Abstract

The invention discloses a pulverizer overheating protection method achieved through an algorithm and a pulverizer, and aims at solving the problems that in the prior art, due to the fact that overheating protection discreteness is large, the pulverizer can run in an overhigh-temperature environment for a long time, and overheating is caused by sudden short-time large current or fault reasons, but the situation cannot be rapidly detected in the prior art; by receiving input voltage / current data of a pulverizer motor and data of temperature around the motor, whether the pulverizer works near a locked-rotor current for a time exceeding a preset time when the voltage is normal is judged, and copper loss of the motor is calculated according to the current. Judging whether the motor winding temperature exceeds an allowable threshold according to the heat conduction coefficient of the motor; and when the temperature of the motor winding exceeds the allowable threshold value, starting a motor protection program. On-off of the motor is flexibly controlled, the motor is protected in time in the crushing process, a good working environment is provided for the crusher, and the service life of the crusher is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of pulverizers, and in particular to a pulverizer overheating protection method. Background Art

[0002] Currently, shredders typically use an internal temperature switch in the motor for overheat protection. When the motor temperature reaches a certain threshold, the switch trips, shutting down the motor and preventing burnout or fire. However, this approach presents several challenges: First, the temperature of the temperature switch varies widely, leading to a high degree of dispersion in the overheat protection, making the overheat protection point imprecise. Second, under abnormal conditions, the internal motor temperature can rise rapidly, and by the time the temperature reaches the temperature switch, the motor windings have already exceeded their permitted temperature. This long-term trend can lead to premature motor failure. When shredding materials with low melting points (such as CDs), the high temperature can cause some of the medium to melt and adhere to the blades, reducing blade sharpness, increasing friction, and ultimately increasing static power consumption. Furthermore, the grease on the gears thins out at high temperatures and is easily thrown out, rendering it ineffective as a protective measure. Summary of the Invention

[0003] The present application provides a crusher overheating protection method and crusher implemented by an algorithm, aiming to solve the problem that the crusher may operate in an excessively high temperature environment for a long time due to the large discreteness of the overheating protection in the existing technology, affecting the normal operation of the crusher. It can serve as an effective supplement to traditional overheating protection.

[0004] In a first aspect, a method for overheating protection of a pulverizer is implemented by an algorithm, the method comprising:

[0005] Receive the input voltage / current and ambient temperature data of the grinder motor, determine whether it has been operating near the locked-rotor current for more than a preset time when the voltage is normal based on the current waveform, calculate the copper loss of the motor based on the current, and determine whether the motor winding temperature exceeds the allowable threshold based on the motor's thermal conductivity;

[0006] When the motor winding temperature exceeds the allowable threshold, the motor protection program is started.

[0007] In the above solution, further optionally, the method further includes: calculating the actual workload of the grinder cutter according to the active power and input current of the motor, and calculating the gear set temperature according to the heat dissipation coefficient of the grinder gear;

[0008] Determine whether the motor winding temperature and the gear set temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the gear set temperature exceeds its corresponding allowable threshold, start the motor protection program. When neither the motor winding temperature nor the gear set temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the gear set temperature respectively.

[0009] In the above solution, optionally, the method further includes: calculating the temperature of the blade group according to the heat dissipation coefficient of the blade group;

[0010] Determine whether the motor winding temperature and the blade group temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when neither the motor winding temperature nor the blade group temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the blade group temperature respectively.

[0011] In the above solution, optionally, the method further comprises: calculating the temperature of the blade group according to the heat dissipation coefficient of the blade group or calculating the temperature of the gear group according to the heat dissipation coefficient of the grinder gear;

[0012] Determine respectively whether the motor winding temperature, gear group temperature and blade group temperature exceed their corresponding allowable thresholds. When any one of the motor winding temperature, gear group temperature and blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when the motor winding temperature, gear group temperature and blade group temperature do not exceed their corresponding allowable thresholds, continue to calculate and determine the motor winding temperature, gear group temperature and blade group temperature respectively.

[0013] In the above solution, optionally, judging whether the motor winding temperature exceeds an allowable threshold value according to the thermal conductivity coefficient of the motor includes:

[0014] The motor winding temperature formula is as follows:

[0015] T=T0+(P CU +P FE ) / R TH ;

[0016] Among them, T represents the motor winding temperature, T0 represents the motor ambient temperature, P CU Indicates copper loss, P CU =mI 2 R, m represents the number of winding phases, I represents the effective current of the winding, and R represents the resistance value of each winding; P FE Represents the motor core loss, and its relationship with the motor input current and frequency is obtained through experiments; R TH Indicates the thermal resistance of the motor winding in °C / W, obtained through experiments;

[0017] When the motor winding temperature T reaches the set temperature, the overheat protection is activated.

[0018] In the above solution, optionally, calculating the temperature rise of the gear set according to the heat dissipation coefficient of the grinder gear includes: calculating the temperature rise of the gear set according to the heat dissipation coefficient of the grinder gear includes:

[0019] The formula for the temperature rise of a gear set is as follows:

[0020]

[0021] Where, ΔT gear Indicates the temperature rise of the gear set in °C; P loss，gear It represents the total power loss of the gear set in W; t represents the running time of the gear set in s; m gear Indicates the mass of the gear set in kg; c p，gear Indicates the specific heat capacity of the gear material, in J / kg·℃;

[0022] Total power loss P of the gear set loss，gear Through experiments, it is simplified to P loss，gear =G×P 有功 , G is the coefficient obtained through experiments, P 有功 Indicates the active power of the motor; gear temperature T gear =T0+ΔT gear , T0 represents the ambient temperature of the motor;

[0023] When the gear set temperature exceeds the set temperature, overheat protection is activated.

[0024] In the above solution, optionally, calculating the temperature of the blade group according to the heat dissipation coefficient of the blade group includes:

[0025] The temperature rise formula of the blade group is as follows:

[0026]

[0027] Where, ΔT blade Indicates the temperature rise of the blade group, in °C; P loos，blade Indicates the total power loss of the blade group in W; t indicates the operation time of the blade group in seconds; m blade Indicates the mass of the blade set in kg; c p，blade Indicates the specific heat capacity of the blade material, in J / kg·℃;

[0028] The total power loss of the blade group P loss，blade Simplified to P through experiment loss，blade =B*P 有功 , B is the coefficient obtained through experiments, P 有功Indicates the active power of the motor;

[0029] Blade temperature T blade =T0+ΔT blade , T0 represents the ambient temperature of the motor;

[0030] When the blade temperature exceeds the set temperature, overheat protection is activated.

[0031] The above solution may optionally include: setting a safety margin for an allowable threshold value corresponding to the gear set according to the upper limit of the operating temperature of the gear grease.

[0032] The above solution may optionally include: setting a safety margin for the allowable threshold corresponding to the blade assembly according to the melting point of the medium to be crushed.

[0033] In a second aspect, a pulverizer includes a pulverizer controller, wherein the pulverizer executes the steps of the above method through the pulverizer controller.

[0034] Compared with the prior art, this application has at least the following beneficial effects:

[0035] This application is based on further analysis and research of existing technical problems and recognizes that the existing overheat protection is highly discrete, which may cause the crusher to operate in an excessively high temperature environment for a long time, and overheat due to sudden short-term high current or fault reasons. However, the existing technology cannot quickly detect it, which affects the normal operation of the crusher and thus shortens the service life of the motor. This application calculates the motor winding temperature through software based on the crusher input voltage, the change of current over time, and the data of the motor ambient temperature, and uses this data to more flexibly control the motor on and off, so that the existing overheat protection of the motor only serves as the final protection barrier, thereby better protecting the motor during the crushing process. In addition, the method of this application is a control logic added to the original controller program of the crusher, without the need to replace the equipment separately. It can serve as an effective supplement to traditional overheat protection, extending the life of the crusher while reducing the replacement cost of the crusher. At the same time, the method of this application also has certain flexibility and scalability, and can be further optimized and improved according to actual needs.

[0036] This application also takes into account the working characteristics of the gear group and the blade group, and calculates the gear group temperature according to the heat dissipation coefficient of the crusher gear; calculates the blade group temperature according to the heat dissipation coefficient of the blade group, and makes a comprehensive judgment based on the motor winding temperature. Through more flexible control logic, it avoids the crusher from running in an excessively high temperature environment for a long time, which in turn causes the problem of shortened motor service life and excessive operating temperature of blades and gears. Using these data, the motor can be controlled more flexibly to be on and off, which not only protects the motor during the crushing process, but also provides a suitable temperature environment for the blade group and gear group.

[0037] This application introduces the motor winding temperature, gear group temperature and cutter group temperature into the control logic of the crusher. Under light load conditions, the continuous working time of the crusher remains almost unchanged. Since the gear group temperature and cutter group temperature are limited under light load conditions, the control logic is mainly based on the motor winding temperature; under full load conditions, the continuous working time of the crusher will be reduced by 10%-20%, but since the blades and gears are well protected, the service life of the crusher is greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic flow chart of a grinder overheat protection method implemented by an algorithm according to the first embodiment of the present application.

[0039] Figure 2 This is a schematic flow chart of a grinder overheat protection method implemented by an algorithm according to the second embodiment of the present application.

[0040] Figure 3 This is a schematic flow chart of a grinder overheat protection method implemented by an algorithm according to the third embodiment of the present application.

[0041] Figure 4 This is a schematic flow chart of a grinder overheat protection method implemented by an algorithm according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0043] In the description of the present application, unless otherwise specified, expressions such as “include”, “comprising”, “having”, etc. also mean “not limited to” (certain units, components, materials, steps, etc.).

[0044] In one embodiment, Figure 1 As shown, a crusher overheating protection method implemented by an algorithm is provided, the method comprising:

[0045] Receive the input voltage / current and ambient temperature data of the grinder motor, determine whether it has been operating near the locked-rotor current for more than a preset time when the voltage is normal based on the current waveform, calculate the copper loss of the motor based on the current, and determine whether the motor winding temperature exceeds the allowable threshold based on the motor's thermal conductivity;

[0046] When the motor winding temperature exceeds the allowable threshold, the motor protection program is started.

[0047] In this embodiment, the motor protection program utilizes existing technology. For example, when the motor winding temperature exceeds a corresponding threshold, the protection program activates to shut down the motor. After a preset time, the motor is restarted, and the grinder operates normally. The motor can be started either by program control or manually, and this application does not specify this.

[0048] The motor protection program can also be that when the motor protection program is started, the crusher adopts a periodic working state, such as crushing for one minute, stopping and cooling for two minutes, and continuing to crush for one minute in a periodic cycle mode; the motor protection program can also be an existing method such as reducing the motor operating frequency to make the crusher work in a low-frequency state, which will not be repeated here.

[0049] This embodiment, based on further analysis and research of existing technical problems, recognizes that the existing overheat protection is highly discrete, which may cause the crusher to operate in an excessively high temperature environment for a long time, or overheat due to sudden, short-term high current or fault reasons. However, the existing technology cannot quickly detect this, affecting the normal operation of the crusher and thus shortening the service life of the motor. This application calculates the motor winding temperature through software based on the crusher input voltage, the change of current over time, and the data of the motor's ambient temperature, and uses the motor winding temperature to flexibly control the motor on and off. The control logic added to the original controller program of the crusher does not require additional equipment replacement and can serve as an effective supplement to traditional overheat protection, making the motor's existing overheat protection only a final protective barrier, thereby protecting the motor during the crushing process. While extending the life of the crusher, it also reduces the replacement cost of the crusher.

[0050] In one embodiment, reference Figure 2 , the crusher overheat protection method implemented by the algorithm also includes:

[0051] The actual workload of the crusher cutter is calculated based on the active power and input current of the motor, and the gear set temperature is calculated based on the heat dissipation coefficient of the crusher gear;

[0052] Determine whether the motor winding temperature and the gear set temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the gear set temperature exceeds its corresponding allowable threshold, start the motor protection program. When neither the motor winding temperature nor the gear set temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the gear set temperature respectively.

[0053] In one embodiment, reference Figure 3 , the crusher overheat protection method implemented by the algorithm also includes:

[0054] Calculate the blade group temperature based on the heat dissipation coefficient of the blade group;

[0055] Determine whether the motor winding temperature and the blade group temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when neither the motor winding temperature nor the blade group temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the blade group temperature respectively.

[0056] This embodiment also takes into account the working characteristics of the gear group and the blade group, and calculates the gear group temperature according to the heat dissipation coefficient of the crusher gear respectively; calculates the blade group temperature according to the heat dissipation coefficient of the blade group, and makes a comprehensive judgment based on the motor winding temperature. Through more flexible control logic, it avoids the crusher from running in an excessively high temperature environment for a long time, which in turn causes the problem of shortened motor service life and excessive operating temperature of blades and gears. Using these data, the motor can be controlled more flexibly to be on and off, which not only protects the motor during the crushing process, but also provides a suitable temperature environment for the blade group and the gear group.

[0057] In one embodiment, reference Figure 4 , the crusher overheat protection method implemented by the algorithm also includes:

[0058] Calculate the temperature of the blade group according to the heat dissipation coefficient of the blade group or calculate the temperature of the gear group according to the heat dissipation coefficient of the grinder gear;

[0059] Determine respectively whether the motor winding temperature, gear group temperature and blade group temperature exceed their corresponding allowable thresholds. When any one of the motor winding temperature, gear group temperature and blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when the motor winding temperature, gear group temperature and blade group temperature do not exceed their corresponding allowable thresholds, continue to calculate and determine the motor winding temperature, gear group temperature and blade group temperature respectively.

[0060] In this embodiment, the motor's input voltage and current are obtained, the motor winding temperature is calculated based on the current waveform and the motor's thermal conductivity, the actual workload of the cutter is calculated based on the active power and input current, and the gear set and blade temperatures are calculated based on their heat dissipation coefficients. These temperatures are then incorporated into the pulverizer's control logic. This allows the pulverizer to maintain a nearly constant continuous operating time under light load conditions, with the control logic primarily focused on the motor winding temperature. Under full load, the continuous operating time is reduced by 10-20%, but the blades and gears are well protected, significantly extending the pulverizer's service life. Furthermore, this method adds control logic to the pulverizer's existing controller program, eliminating the need for additional equipment replacement. This extends the pulverizer's lifespan while reducing replacement costs. Furthermore, the method offers flexibility and scalability, allowing for further optimization and improvement based on actual needs.

[0061] In one embodiment, determining whether the motor winding temperature exceeds an allowable threshold value based on the thermal conductivity of the motor includes:

[0062] The motor winding temperature formula is as follows:

[0063] T=T0+(P CU +P FE ) / R TH ;

[0064] Among them, T represents the motor winding temperature, T0 represents the motor ambient temperature, P CU Indicates copper loss, P CU =mI 2 R, m represents the number of winding phases, I represents the effective current of the winding, and R represents the resistance value of each winding; P FE Represents the motor core loss, and its relationship with the motor input current and frequency is obtained through experiments; R TH Indicates the thermal resistance of the motor winding in °C / W, obtained through experiments;

[0065] When the motor winding temperature T reaches the set temperature, the overheat protection is activated.

[0066] In one embodiment, calculating the gear set temperature based on the heat dissipation coefficient of the grinder gear includes:

[0067] The formula for the temperature rise of a gear set is as follows:

[0068]

[0069] Where, ΔT gear Indicates the temperature rise of the gear set in °C; P loss，gear It represents the total power loss of the gear set in W; t represents the running time of the gear set in s; m gear Indicates the mass of the gear set in kg; c p，gear Indicates the specific heat capacity of the gear material, in J / kg·℃;

[0070] Total power loss P of the gear set loss，gear Through experiments, it is simplified to P loss，gear =G×P 有功 , G is the coefficient obtained through experiments, P 有功 Indicates the active power of the motor; gear temperature T gear =T0+ΔT gear , T0 represents the ambient temperature of the motor;

[0071] When the gear set temperature exceeds the set temperature, overheat protection is activated.

[0072] In one embodiment, calculating the blade group temperature according to the heat dissipation coefficient of the blade group includes:

[0073] The temperature rise formula of the blade group is as follows:

[0074]

[0075] Where, ΔT blade Indicates the temperature rise of the blade group, in °C; P loos，blade Indicates the total power loss of the blade group in W; t indicates the operation time of the blade group in seconds; m blade Indicates the mass of the blade set in kg; c p，blade Indicates the specific heat capacity of the blade material, in J / kg·℃;

[0076] The total power loss of the blade group P loss，blade Simplified to P through experiment loss，blade =B*P 有功 , B is the coefficient obtained through experiments, P 有功 Indicates the active power of the motor;

[0077] Blade temperature T blade =T0+ΔT blade , T0 represents the ambient temperature of the motor;

[0078] When the blade temperature exceeds the set temperature, overheat protection is activated.

[0079] In one embodiment, the method includes setting a safety margin for an allowable threshold corresponding to the gear set according to an upper limit of an operating temperature of the gear grease.

[0080] In one embodiment, the method includes setting a safety margin for an allowable threshold value corresponding to the blade assembly according to the melting point of the pulverized medium.

[0081] In this embodiment, the safety margin refers to an additional temperature range reserved between the normal operating temperature range of the device and the critical temperature at which the device may be damaged.

[0082] By setting a safety margin, you can ensure that the device will not be damaged by overheating during operation. Even if the actual temperature approaches the protection threshold, the device still has sufficient buffer to prevent damage caused by brief temperature fluctuations or measurement errors. Furthermore, maintaining device operation within the safe temperature range can reduce fatigue and aging caused by high-temperature operation, thereby extending the device's service life.

[0083] Gear set: If the upper operating temperature limit of the gear grease is 120°C, the gear set protection threshold can be set to 100°C, leaving a safety margin of 20°C. This way, even if the gear set temperature approaches 100°C, the grease can still operate within the safe range.

[0084] Blade group: If the melting point of the medium to be shredded (such as a CD) is 150°C, the protection threshold of the blade group can be set to 100°C, leaving a safety margin of 50°C to prevent the blade temperature from being too high, causing the medium to melt or the blade to be damaged.

[0085] In this embodiment, the blade temperature is kept sufficiently safe from the melting point of the pulverized media (particularly low-melting-point media such as optical discs and cards). The gear set temperature also maintains a reasonable margin from the upper operating temperature limit of the gear grease. By establishing a safe operating temperature range for key components like gears and blades, and allowing for this margin, damage from overheating can be effectively prevented. This helps extend the life of the equipment and reduces repair and replacement costs.

[0086] In one embodiment, a pulverizer is further provided, including a pulverizer controller, wherein the pulverizer implements the steps of the method of the above embodiment when the pulverizer control program is executed.

[0087] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A method for overheat protection of a pulverizer implemented by an algorithm, characterized in that: include: Receive the input voltage / current and ambient temperature data of the grinder motor, determine whether it has been operating near the locked-rotor current for more than a preset time when the voltage is normal based on the current waveform, calculate the copper loss of the motor based on the current, and determine whether the motor winding temperature exceeds the allowable threshold based on the motor's thermal conductivity; When the motor winding temperature exceeds the allowable threshold, the motor protection program is started.

2. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 1, characterized in that: Also includes: The actual workload of the crusher cutter is calculated based on the active power and input current of the motor, and the gear set temperature is calculated based on the heat dissipation coefficient of the crusher gear; Determine whether the motor winding temperature and the gear set temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the gear set temperature exceeds its corresponding allowable threshold, start the motor protection program. When neither the motor winding temperature nor the gear set temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the gear set temperature respectively.

3. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 1, characterized in that: Also includes: Calculate the blade group temperature based on the heat dissipation coefficient of the blade group; Determine whether the motor winding temperature and the blade group temperature exceed their corresponding allowable thresholds respectively. When either the motor winding temperature or the blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when neither the motor winding temperature nor the blade group temperature exceeds its corresponding allowable threshold, continue to calculate and determine the motor winding temperature and the blade group temperature respectively.

4. The method for overheat protection of a pulverizer implemented by an algorithm according to any one of claims 2 or 3, characterized in that: Also includes: Calculate the temperature of the blade group according to the heat dissipation coefficient of the blade group or calculate the temperature of the gear group according to the heat dissipation coefficient of the grinder gear; Determine respectively whether the motor winding temperature, gear group temperature and blade group temperature exceed their corresponding allowable thresholds. When any one of the motor winding temperature, gear group temperature and blade group temperature exceeds its corresponding allowable threshold, start the motor protection program; when the motor winding temperature, gear group temperature and blade group temperature do not exceed their corresponding allowable thresholds, continue to calculate and determine the motor winding temperature, gear group temperature and blade group temperature respectively.

5. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 1, characterized in that: The step of judging whether the motor winding temperature exceeds an allowable threshold value according to the thermal conductivity coefficient of the motor includes: The motor winding temperature formula is as follows: T=T0+(P CU +P FE ) / R TH ; Among them, T represents the motor winding temperature, T0 represents the motor ambient temperature, P CU Indicates copper loss, P CU =mI 2 R, m represents the number of winding phases, I represents the effective current of the winding, and R represents the resistance value of each winding; P FE Represents the motor core loss, and its relationship with the motor input current and frequency is obtained through experiments; R TH Indicates the thermal resistance of the motor winding in °C / W, obtained through experiments; When the motor winding temperature T reaches the set temperature, the overheat protection is activated.

6. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 2, characterized in that: Calculating the gear set temperature based on the heat dissipation coefficient of the grinder gear includes: The formula for the temperature rise of a gear set is as follows: Where, ΔT gear Indicates the temperature rise of the gear set in °C; P loss，gear It represents the total power loss of the gear set in W; t represents the running time of the gear set in s; m gear Indicates the mass of the gear set in kg; c p，gear Indicates the specific heat capacity of the gear material, in J / kg·℃; Total power loss P of the gear set loss，gear Through experiments, it is simplified to P loss，gear =G×P 有功 , G is the coefficient obtained through experiments, P 有功 Indicates the active power of the motor; gear temperature T gear =T0+ΔT gear , T0 represents the ambient temperature of the motor; When the gear set temperature exceeds the set temperature, overheat protection is activated.

7. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 3, characterized in that: Calculating the temperature of the blade group according to the heat dissipation coefficient of the blade group includes: The temperature rise formula of the blade group is as follows: Where, ΔT blade Indicates the temperature rise of the blade group, in °C; P loss，blade Indicates the total power loss of the blade group in W; t indicates the operation time of the blade group in seconds; m blade Indicates the mass of the blade set in kg; c p，blade Indicates the specific heat capacity of the blade material, in J / kg·℃; The total power loss of the blade group P loss，blade Simplified to P through experiment loss，blade =B*P 有功 , B is the coefficient obtained through experiments, P 有功 Indicates the active power of the motor; Blade temperature T blade =T0+ΔT blade , T0 represents the ambient temperature of the motor; When the blade temperature exceeds the set temperature, overheat protection is activated.

8. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 2, characterized in that: include: A safety margin is set for the allowable threshold corresponding to the gear set based on the upper limit of the operating temperature of the gear grease.

9. The method for overheat protection of a pulverizer implemented by an algorithm according to claim 3, characterized in that: include: A safety margin is set for the allowable threshold corresponding to the blade group according to the melting point of the medium to be crushed.

10. A pulverizer, comprising a pulverizer controller, characterized in that: The pulverizer executes the steps of the method according to claim 1 through the pulverizer controller.

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