A low-noise pulverizing method for a food processing machine and a pulping method thereof

Abstract

The present invention relates to a working method of kitchen appliances, in particular to a low-noise crushing method of a food processing machine and a pulping method thereof, wherein the method of a crushing blade crushing materials once comprises: a material pushing stage: controlling the crushing blade to increase from 0 to a first rotational speed at a first angular acceleration, the duration of the material pushing stage not exceeding 600ms, so as to instantly push the mixture of materials and water to move; a uniform acceleration stage: controlling the crushing blade to uniformly accelerate to a second rotational speed at a second angular acceleration to drive the accelerated movement of the material, the second angular acceleration being less than the first angular acceleration, and the second rotational speed being greater than the first rotational speed; a constant speed crushing stage: controlling the crushing blade to maintain the second rotational speed to crush the material. The crushing method of the present invention controls the single crushing process of the crushing blade through a brushless motor, so as to achieve lower noise in the pulping process, especially the noise of each start-up of the crushing. Moreover, the slurry beverage obtained using the above-mentioned crushing method is also delicate and fragrant.

Description

Technical Field

[0001] The invention relates to a working method of kitchen appliances, in particular to a low-noise pulverizing method of a food processor and a pulping method thereof. Background Art

[0002] Soymilk machines or wall-breaking machines will generate pulping noise during the process of making soymilk. The national standard (GB / T26179-2010) stipulates that the A-weighted sound power level of the noise generated by the normal operation of the soymilk machine should not exceed 80dB, that is, during the pulping process, when the crushing blade is in a steady-state crushing material, the peak noise should be required to be no more than 80dB. The reason for choosing the steady-state crushing of the crushing blade is that the crushing blade is in a steady-state crushing for a long time, and consumers perceive the noise more obviously. Second, the noise variation range during steady-state crushing is small, the detection is more accurate, and it is easier to obtain a stable noise value. However, in the actual use of the soymilk machine, consumers usually still feel that in the first few seconds before the soymilk machine enters the steady-state crushing, they will also feel a large pulping noise, which will also significantly affect the physical and mental feelings of consumers.

[0003] Most of the existing soybean milk machines use series-excited motors. The applicant has been engaged in the research and development of soybean milk machines for a long time. Through research, the applicant found that since the series-excited motor can only rotate in one direction, it cannot realize the evaluation and detection of the current, voltage, and position information of the motor, nor does it have the intelligent identification and start of different ingredients and loads. It can only adopt a single, uneven, slow-start crushing method. With such a crushing method, the crushing blade will be greatly hindered by the material during the initial operation, that is, the motor will be subjected to a large load. When the motor load increases, on the one hand, the motor body is more likely to form high-frequency vibrations, causing other parts of the soybean milk machine to resonate at the same frequency, which will be reflected in the soybean milk machine. In the first few seconds of beating, a large resonance noise will be generated. On the other hand, when the motor load continues to increase, for example, if the consumer adds too much material, the current value of the motor will also increase. When the current exceeds the limit value, the motor is prone to stalling, the crushing blade will get stuck, and even the motor will have the problem of burning the machine, affecting the service life of the soybean milk machine.

[0004] In order to solve the problem of blade jamming or motor stalling in food processing machines, the invention patent application with application number CN201410074752.2 discloses a method of controlling the brushless motor forward → reverse → forward by utilizing the characteristics of the brushless motor to loosen the heavy load and solve the problem of blade jamming or motor stalling. At the same time, patent application number CN201811009915.3 discloses that blade jamming or motor stalling can be avoided by controlling the current and reversing the motor. At the same time, the applicant has also applied for an invention patent (patent number CN201710659735.9, the invention name is a motor starting method for a soymilk machine), which discloses that the starting parameters such as the total number of motor starting steps n, the duration of each motor step t, and the current threshold I0 of each motor step that are preset and stored can be used to control the starting of the brushless motor, which can solve the problems of abnormal stalling and too small torque during the motor starting process, ensure the safe starting of the motor, and automatically adjust the current according to the noise of the motor starting, reduce the current when the noise is loud, and increase the current when the noise is small, so as not to cause the current overload and cause the motor to burn out. The above patent applications all utilize the controllable characteristics of brushless motors to solve the problems of motor stalling and safety, but they still cannot solve the problem of high pulping noise felt by consumers during the pulping process, especially during the initial crushing of materials. Summary of the invention

[0005] The purpose of the present invention is to provide a low-noise crushing method and pulping method for a food processing machine. The method controls the single crushing process of the crushing blade through a brushless motor, so that during the pulping process, the noise at each stage of each crushing of the material by the crushing blade is lower, especially the loud noise problem each time the crushing blade starts crushing, which greatly improves the consumer's experience. Moreover, in the pulping process, by cyclically using the crushing method, the produced soy milk is also delicate and fragrant.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a low-noise pulverizing method for a food processor, characterized in that: the food processor drives a pulverizing blade to pulverize materials through a brushless motor, and during the pulping process, the pulverizing blade pulverizes materials once, comprising:

[0007] Material pushing stage: Control the crushing blade to increase the speed from 0 to the first speed at the first angular acceleration, and the duration of the material pushing stage does not exceed 600ms, so as to instantly push the mixture of material and water to move;

[0008] Uniform acceleration stage: Control the crushing blade to uniformly accelerate to a second rotational speed at a second angular acceleration to drive the material to accelerate, wherein the second angular acceleration is less than the first angular acceleration, and the second rotational speed is greater than the first rotational speed;

[0009] Constant speed crushing stage: the crushing blade is controlled to maintain the second speed to crush the material.

[0010] Furthermore, after the crushing blade is activated and before the uniform acceleration stage, a first speed reduction stage is provided for reducing the rotation speed of the crushing blade from the first rotation speed to the third rotation speed.

[0011] Furthermore, in the first speed reduction stage, the crushing blade is not controlled, and the crushing blade is reduced in speed to the third speed.

[0012] Furthermore, in the first speed reduction stage, the brushless motor is in a power-off state.

[0013] Furthermore, the third rotation speed is not 0;

[0014] Alternatively, the third speed is reduced to at least 1 / 3 of the first speed;

[0015] Alternatively, the third rotation speed is 1000 rpm to 4000 rpm.

[0016] Furthermore, the duration of the first speed reduction stage is 20ms to 300ms.

[0017] Furthermore, the startup time of the crushing blade from the start of operation to the constant speed crushing stage accounts for no more than 1 / 3 of the total operation time of the crushing blade in a single operation.

[0018] Furthermore, the first angular acceleration is 1500-6000 rad / s 2 ;

[0019] Alternatively, the first rotation speed is selected within the range of 2000 rpm to 6000 rpm according to different pulping functions;

[0020] Alternatively, the duration of the material pushing stage is 50 ms to 500 ms.

[0021] Furthermore, the second angular acceleration is 65.4-628 rad / s 2 ;

[0022] Alternatively, the duration of the uniform acceleration stage is 2s to 8s.

[0023] Furthermore, the pulverizing time of the constant speed pulverizing stage is 10s to 30s;

[0024] Alternatively, the second rotation speed is an average rotation speed in the constant speed crushing stage, and the fluctuation of the highest rotation speed and / or the lowest rotation speed in the constant speed crushing stage relative to the average rotation speed does not exceed 1%.

[0025] In addition, the present application also provides a pulping method for a food processor, characterized in that: the pulping method comprises:

[0026] Crushing stage: In the crushing stage, the above-mentioned crushing method is cyclically used to crush the material to produce slurry;

[0027] Heating stage: heating the prepared slurry.

[0028] Whether it is a soymilk machine using a series-excited motor or a soymilk machine using a brushless motor, based on the requirements of national standards, each manufacturer focuses on adjusting the performance of the motor, the installation structure of each component, the pulping process, etc., to meet the pulping process. The noise value of the grinding blade entering the steady-state grinding is lower. However, it is ignored that during the startup process of each grinding, consumers will also feel the problem of high grinding noise. The grinding method provided in the present application utilizes the controllable characteristics of the brushless motor to control the single grinding process of the grinding blade during the pulping process, so that the grinding blade can make consumers feel lower pulping noise throughout the entire process of a single grinding of the material, and even during the startup process of the grinding blade. Moreover, during the pulping process, the grinding method of the present application is used for cyclic pulping, and a fragrant and delicate pulp beverage can also be obtained.

[0029] In the material pushing stage of the present application, the first angular acceleration is controlled by the crushing blade to increase from 0 to the first speed. The inventor found through research that the smaller the first angular acceleration, the smaller the instantaneous force of pushing the material. When the material hardness is large or the accumulation is large, the knife may be stuck. When the first angular acceleration is too large, the instantaneous force of the crushing blade to push the material is large, and the reaction force (i.e., load) of the material borne by the crushing blade is also large. At this time, the same frequency resonance noise of the food processor is easily generated. However, in the material pushing stage of the present application, it is required to stir the material to move within a time not exceeding 600ms. Although the instantaneous load borne by the crushing blade is very large at this time, in such a short time, even if the food processor generates a large resonance noise value due to the increase in load, the noise impact that consumers can feel will not be too significant.

[0030] The inventors have found through research that when the first angular acceleration is selected to be 1500-6000 rad / s 2When the material particles with an average diameter of less than 20 mm (such as soybeans, peanuts, black beans and other legumes) are stirred up, and the probability of the crushing blade getting stuck is very low. Moreover, the first angular acceleration of the crushing blade is too large to control the rotational inertia of the crushing blade, which causes the problem of liquid splashing caused by instantaneous start-up overspeed; moreover, the noise impact felt by consumers instantly at this time is not obvious. At the same time, the inventors also found that when the material is stirred up and moved, the pushing resistance of the crushing blade to continuously push the material is reduced (that is, the load is reduced), and the probability of the corresponding food processor generating resonance noise is significantly reduced. Therefore, in a single crushing process, the material pushing stage of the present application stirs the material up and moves, which can lay the foundation for the subsequent crushing blade to crush the material with lower crushing noise.

[0031] In the uniform acceleration stage, the present application controls the crushing blade to uniformly accelerate to a second speed with a second angular acceleration lower than the first angular acceleration, and the second speed is greater than the first speed. In this stage, the crushing blade is in a uniform acceleration process. Compared with the existing variable acceleration soybean milk machine or wall breaking machine, the acceleration process of the food processor of the present application is lighter, the motor acceleration sound quality is softer, and the sound during the acceleration process is more easily accepted by consumers, and will not produce sharp and harsh noise perception. Moreover, in this stage, under the action of the uniform acceleration of the crushing blade, the material is also continuously pushed and accelerated, and the relative movement between the material and the crushing blade is reduced. Therefore, compared with the existing variable acceleration crushing start-up method, the material in this stage of the present application has less chaotic collisions, and the collision noise generated will be relatively lower.

[0032] In addition, when the crushing blade is accelerated to the second speed, the material also has a relatively high initial speed of movement. The higher the initial speed of movement of the material, the lower the load of the crushing blade to crush the material, and the lower the load, the smaller the corresponding resonance noise value. Therefore, the uniform acceleration stage of the present application effectively ensures that after entering the constant speed crushing (i.e., the steady-state crushing of the crushing blade), the crushing blade is in a relatively low load to crush the material. At the same time, compared with the pulping process of the steady-state crushing of the existing food processing machine, the constant speed crushing stage of the present application is always in a relatively constant speed to crush the material. Therefore, there will be no high and low acceleration and deceleration crushing sounds during the crushing process, and the pulping stability is also better, and it is not easy to produce the problem of slurry splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] Figure 1 A structural schematic diagram of a food processing machine of the present invention;

[0035] Figure 2 A flow chart of a single crushing of a crushing blade during pulping;

[0036] Figure 3 This is the crushing curve diagram of the crushing blade during a single operation. DETAILED DESCRIPTION

[0037] like Figure 1 , which is a schematic structural diagram of an embodiment of a food processor of the present invention. The food processor comprises a machine base 1 and a crushing cup 2, wherein a brushless motor 3 is installed in the machine base 1, wherein a crushing blade 4 is arranged in the crushing cup 2, and the crushing blade 4 is driven to rotate by the brushless motor 3 to crush the material.

[0038] The food processor of this embodiment has multiple production functions. The following takes the production of soybean milk as an example to illustrate the low-noise crushing method of the food processor of the present invention. Figure 2 As shown, it is a flow chart of one of the crushing operations of the crushing blade during N crushing operations of the food processor of the present invention when making pulp. Figure 3 It is a crushing curve corresponding to a single operation of the crushing blade.

[0039] Among them, the crushing blade has the following stages in a crushing process, including:

[0040] Material pushing stage (AB): Control the crushing blade to the first angular acceleration α1 = 3140 rad / s 2 , from 0 to the first speed n1 = 3000 rpm, the duration of the material pushing stage is t1 = 100 ms (t1 does not exceed 600 ms), so as to instantly push the mixture of material and water to move;

[0041] The first deceleration stage (BC): the speed of the crushing blade is controlled to decrease from the first speed n1 = 3000 rpm to the third speed n3 = 2000 rpm, so that the crushing blade is not synchronized with the material;

[0042] Uniform acceleration stage (CD): Control the crushing blade to the second angular acceleration α2 = 340 rad / s 2 , uniformly accelerating to a second speed n2 = 13000 rpm to drive the material to accelerate, wherein the second angular acceleration α2 is less than the first angular acceleration α1, and the second speed n2 is greater than the first speed n1;

[0043] Constant speed crushing stage (DE): Control the crushing blade to continuously crush the material at a constant speed.

[0044] The second deceleration stage (EF): decelerate the crushing blade to 0 to complete a single crushing.

[0045] According to the research, the inventor found that in the crushing stage of pulping, when the above-mentioned crushing method is used cyclically, the pulping noise of the crushing blade each time the material is crushed is low, and the average noise is basically below 69dB. Moreover, whether it is the initial crushing when the crushing blade is started, or the constant speed crushing when the crushing blade is in a steady state, consumers can feel the low pulping noise. Moreover, the slurry produced by the crushing method of the present application, after heating and maturation, can also have the quality of fine, fragrant and good soy milk.

[0046] The reason why consumers have such an experience is that: in the material pushing stage of this embodiment, the crushing blade is controlled to increase from 0 to the first speed n1 with the first angular acceleration α1. The inventor found through research that the smaller the first angular acceleration α1, the smaller the force of instantaneous pushing of the material. When the material hardness is large or there is a lot of accumulation, there may be a situation of knife jamming. When the first angular acceleration α1 is too large, the instantaneous force of the crushing blade to push the material is large, and the reaction force (i.e., load) of the material borne by the crushing blade is also large. At this time, it is easy to generate the same frequency resonance noise of the food processor. However, in the material pushing stage of this embodiment, the duration of the speed of the crushing blade from 0 to the first speed n1 is short, and the mixture of material and water is stirred and moved within about 100ms. Although the load borne by the crushing blade instantaneously is very large at this time, in such a short time, even if the food processor generates a large resonance noise value due to the large load, the noise impact that consumers can feel will not be too significant. At the same time, the inventors also found that when the material is stirred and moved, the pushing resistance of the crushing blade to continuously push the material is reduced (i.e., the load is reduced), and the probability of the corresponding food processor generating resonance noise is also significantly reduced. Therefore, in a single crushing process, the material pushing stage of this embodiment stirs the mixture of material and water to move, which can lay the foundation for the subsequent crushing blade to crush the material with lower crushing noise.

[0047] In the uniform acceleration stage, the present embodiment uses a second angular acceleration α2 lower than the first angular acceleration α1 to control the crushing blade to uniformly accelerate to a second speed n2, and the second speed n2 is greater than the first speed n1. In this stage, the crushing blade is in a uniform acceleration process. Compared with the existing variable acceleration soybean milk machine or wall breaking machine, the acceleration process of the food processor in this embodiment is lighter, the motor acceleration sound quality is softer, and the sound during the acceleration process is more easily accepted by consumers, and will not produce sharp and harsh noise. Moreover, in this stage, under the action of the uniform acceleration of the crushing blade, the material is also continuously pushed and accelerated, and the relative movement between the material and the crushing blade is reduced. Therefore, compared with the existing variable acceleration crushing start-up method, the material chaos collision in this stage of this embodiment is relatively less, and the collision noise felt by consumers will also be relatively lower.

[0048] In this embodiment, before uniform acceleration and after the material pushing stage, a first deceleration stage is also provided. In the first deceleration stage, the rotation speed of the crushing blade is controlled to be reduced from the first rotation speed n1 to the third rotation speed n3. The main purpose is to reduce the load of the crushing blade when entering the uniform acceleration stage. As mentioned above, the main purpose of the material pushing stage is to stir the mixture of material and water to move in a very short time, because the force applied to the moving material will be smaller, and the reverse force (load) borne by the corresponding force-applying object (crushing blade) will also be smaller. If the material is continuously applied to the material as soon as it is stirred to accelerate the material, the crushing blade may bear a larger load as the material moves and accumulates. If the crushing load of the crushing blade is large, the crushing blade is relatively easy to get stuck or stalled, and there is even a risk of the motor burning due to increased current. Moreover, in the uniform acceleration stage, the second angular acceleration α2 of the crushing blade is significantly smaller than the first angular acceleration α1, and the target speed n2 after uniform acceleration is also significantly larger than the first speed n1. Therefore, the duration t2 of the uniform acceleration stage is significantly longer than the duration t1 of the material pushing stage. As mentioned above, the resonant noise generated by the crushing for a period of time (greater than 600ms) under a large load will cause sensory discomfort to consumers. Therefore, for the present embodiment, in order to be on the safe side and to further reduce the probability of such risk, a first deceleration stage for the crushing blade is set before the uniform acceleration stage, so that the movement of the material is not synchronized with the rotation of the crushing blade, which is conducive to reducing the pulping noise in the uniform acceleration stage and is also conducive to the safe use of the motor.

[0049] In addition, when the crushing blade is accelerated to the second rotation speed n2, the material also has a relatively high initial speed of movement. The higher the initial speed of movement of the material, the lower the load of the crushing blade on the material to be crushed, and the lower the load, the smaller the corresponding resonance noise value. Therefore, the uniform acceleration stage of this embodiment also ensures that after entering the constant speed crushing stage (i.e., steady-state crushing of the crushing blade), the crushing blade is in a relatively low load to crush the material. At the same time, compared with the pulping process of steady-state crushing of the existing food processing machine, the constant speed crushing stage of this embodiment is always in a relatively constant speed to crush the material. Therefore, there will be no high and low acceleration and deceleration crushing sounds during the crushing process, and the pulping stability is also better, and it is not easy to produce slurry splashing problems.

[0050] It should be noted that for this embodiment, during the material pushing stage, the duration t1 is required to be no more than 600ms. The inventor has found that the smaller t1 is, the less impact people feel from the initial crushing noise when the crushing blade is started, and if t1 increases, the impact of the noise will also increase. The inventor has found through repeated debugging and verification that when the food processor of the present invention is used for pulping, if the duration of the material pushing stage is controlled to be no more than 600ms, most people can accept the impact of this transient noise. However, when t1 exceeds 600ms, most people find it difficult to accept the stimulation of the eardrum by the sound at this stage.

[0051] Using the food processor of the present invention, the inventor conducted a group of studies as shown in Table 1. When making soy milk, in the material pushing stage, different first angular accelerations α1 were used to accelerate from 0 to n1=3000rmp, and the crushing blade was instantly started to crush wet soybeans. The phenomenon was reflected. Among them, 10 tests were carried out under each α1 value. Since the experimental process was very short, it was difficult for the instrument to accurately detect the corresponding noise value. In this experimental process, the inventor used 10 sample personnel to study the noise acceptance of the process.

[0052] Table 1 Comparison of the phenomenon of crushing blades accelerating to n1 with different α1

[0053]

[0054] Through research, it is found that when the first angular acceleration α1 is less than 1500rad / s 2 When the first angular acceleration α1 is greater than 6000rad / s, the crushing blade will not be able to exert enough force on the material, and there is a probability that the crushing blade will get stuck. The mixture of material and water may not be stirred to move, and the brushless motor may have the risk of burning. 2 When the pulverizing blade has a large rotational inertia, it is difficult to control the speed. Instantaneous start may cause overspeed, which may easily cause liquid splashing and pose a safety risk of scalding to consumers. At the same time, when the first angular acceleration α1 exceeds 6000rad / s 2 When the inertia of the crushing blade exceeds the predetermined n1, the reaction force of the corresponding material on the crushing blade will be greater, which is easy to cause the instantaneous load of the crushing blade to increase and cause resonance noise. In this process, some people will feel unacceptable noise. Based on the differences in noise perception among different people, the inventors have determined that more than 90% of people can accept the impact of noise as qualified. Therefore, the first angular acceleration α1 of the present invention is selected to be 1500-6000rad / s 2The inventor found that within this range, in multiple verification processes, material particles with an average diameter of less than 20 mm (such as soybeans, peanuts, black beans and other legumes) can be stirred and moved, and the probability of the crushing blade getting stuck is very low. Moreover, the first angular acceleration α1 of the crushing blade is too large to control the rotational inertia of the crushing blade, causing the instantaneous starting speed to exceed the predetermined value, and causing liquid splashing problems; moreover, when the crushing blade is started to crush the material with the above-mentioned first angular acceleration α1, more than 90% of the majority of people do not feel the impact of the instantaneous noise when the crushing blade is started. It should be noted that in the material pushing stage, the first angular acceleration α1 of the present invention is the average angular acceleration of this stage.

[0055] At the same time, for the food processor of this embodiment, in the material pushing stage, it is better to control the first speed n1 at 2000rmp~6000rmp, because the higher the first speed n1 is set, the more difficult it is to control the speed of the crushing blade due to the inertia force after starting, and there is a risk of overspeed. In addition, the food processor of this embodiment has a variety of different production functions, and the first speed n1 can be selected and set within the above-mentioned preferred range according to different pulping functions. Of course, the food processor of this embodiment can also crush solid materials, such as making ice smoothies and dry grinding powder, and the corresponding first speed n1 can be selected to be higher, such as 6000rmp~8000rmp. Compared with the pulping function, the requirements for noise of ice smoothies and dry grinding materials will be appropriately reduced, but they can still be applied to the crushing method of the present invention to further reduce noise. At the same time, the higher speed setting will not cause liquid splashing. In addition, for the crushing method of this embodiment, the duration t1 of the material pushing stage is controlled at 50ms~500ms. In order to fully reduce the noise felt by consumers when the crushing blade is started, the shorter the time t1 is, the better it is during the material pushing stage. However, if t1 is short enough, the first angular acceleration α1 will inevitably be high enough to cause splashing of liquid when the crushing blade is started. Moreover, if t1 is too short, the mixture of material and water may not be stirred. Therefore, t1 is preferably 80ms to 200ms.

[0056] At the same time, in this embodiment, in the uniform acceleration stage, the crushing blade accelerates the material movement with the second angular acceleration α2 until the rotation speed of the crushing blade reaches the second rotation speed n2. The inventors found that the second angular acceleration α2 in the uniform acceleration stage has a certain relationship with the rotation speed increase of the crushing blade in this stage (the difference between the rotation speed at the end of this stage and the rotation speed at the beginning of this stage), that is, when the rotation speed increase is different, the requirements for the second angular acceleration α2 are different.

[0057] As shown in Table 2, the food processing machine was studied as follows using the idea of ​​the present invention: during the uniform acceleration stage, the soy milk function was produced, and the physical phenomena were reflected when the crushing blade was accelerated from n3 = 4000 rpm to n2 = 9000 rpm with different second angular accelerations α2.

[0058] Table 2 Comparison of experimental phenomena when the crushing blade is accelerated to n2 using different α2

[0059]

[0060] In the above research, the inventors found that when the second angular acceleration α2 is controlled to accelerate at a smaller value, there is a probability of tool jamming, and when α2 ≥ 65.4 rad / s 2 The knife jam did not occur again.

[0061] In addition, the inventors also conducted another group of studies, as shown in Table 3, when making soy milk in the uniform acceleration stage, the crushing blades were accelerated from n3 = 2000 rpm to n2 = 14000 rpm with different second angular accelerations α2, and the physical phenomena reflected.

[0062] Table 3 Comparison of experimental phenomena of crushing blades accelerated to n2 using different α2

[0063]

[0064] In the above study, α2 was controlled to be greater than 83.7 rad / s 2 The acceleration was performed and there was no phenomenon of the crushing blade getting stuck. However, when α2>628rad / s 2 After that, there is gradually a problem of liquid splashing. Moreover, as the value of α2 increases, not only the amount of liquid splashing increases, but also the noise impact felt by the experimenters becomes more obvious.

[0065] It can be seen that when the material is in different states and in the process of uniform acceleration of the material, different pulping problems will be caused when different second angular accelerations α2 are used to accelerate the material.

[0066] Among them, the duration of the uniform acceleration stage of this embodiment is t2, and α2t2 = (n2-n3)π / 30. For the food processor of this embodiment, during a pulping process, the crushing blade needs to rotate about 10 to 20 times, and the total time for the crushing blade to crush the material in a single time generally does not exceed 35s, because the longer the single crushing time is, the longer the single working time of the brushless motor is, which is not conducive to the heat dissipation of the motor. The motor will have a higher temperature rise due to the long continuous working time, and on the one hand, there is a risk of burning the machine; on the other hand, the slurry may also overflow due to absorbing more friction heat (or motor heat). For the crushing method of the food processor of this embodiment, if the duration t2 of the uniform acceleration stage is too long, it is not conducive to the control of the subsequent constant speed crushing time, that is, if t2 increases, the constant speed crushing time is shortened accordingly, and the crushing fineness of the material may not be ideal when the pulping cycle remains unchanged. If t2 increases and the corresponding constant-speed crushing time does not shorten, the pulping cycle needs to be extended accordingly while ensuring the quality of the slurry. However, this may be accompanied by safety risks such as motor burning or slurry overflow.

[0067] Therefore, for the pulverizing method of the food processor of this embodiment, in the uniform acceleration stage, regardless of the speed increase, it is required that the duration t2 of this stage is preferably controlled within 2s to 8s, and the second angular acceleration α2 is preferably limited to 65.4 rad / s 2 ~628rad / s 2 The inventors have found that the uniform acceleration stage is preferably controlled within 3s to 5s after comprehensive consideration of pulping effect and noise, and the second angular acceleration α2 is preferably selected as 104.7 rad / s 2 ~418.7rad / s 2 .

[0068] It should be noted that, in the pulverizing method of the food processor of this embodiment, in the first deceleration stage, a variety of different ways can be used to control the pulverizing blade from the first speed n1 to the third speed n3, for example, the control system allows the brushless motor to be powered off, and does not actively apply force to the pulverizing blade, so that the pulverizing blade can be automatically decelerated to n3, or the pulverizing blade can be controlled to slowly decelerate to n3. Of course, for this embodiment, the first deceleration stage cannot control the pulverizing blade to decelerate to 0, otherwise the effect of the previous material pushing stage will be wasted, and the material needs to be stirred up again to ensure the low noise of subsequent pulverization. The inventor found through research that the third speed n3 is generally controlled to be no less than 1 / 3 of the first speed n1, or, according to the different functions of the food processor, the third speed n3 is controlled within 1000rmp~4000rmp, and, according to different control methods, different first deceleration duration t3 can be selected. The duration t3 of the first deceleration stage in this embodiment is preferably limited to 20ms~300ms. In order to combine pulping efficiency and noise impact, in this embodiment, t3 is preferably between 20ms and 100ms. For this embodiment, setting the first deceleration stage before entering the uniform acceleration stage is conducive to the controllability of the crushing blade, so that the crushing blade will not be overspeeded due to inertia. It is also to make the crushing blade asynchronous with the material, and to provide control preparation for the rotation of the crushing blade for the subsequent uniform acceleration stage, laying the foundation for the subsequent crushing to maintain a low pulping noise. Of course, in the controllable state where the first angular acceleration α1 is relatively small, it is also possible to directly control the crushing blade to enter the uniform acceleration stage after the material pushing stage, and accelerate to the second speed n2 with the second angular acceleration α2.

[0069] As mentioned above, the time it takes for the crushing blade to crush materials at one time is generally about 35 seconds. For this embodiment, the crushing time in the constant speed crushing stage is preferably controlled at 10 seconds to 30 seconds. If the time consumed before the constant speed crushing stage is too long, the time used in the constant speed crushing stage for actually crushing the material will be reduced. Based on a comprehensive study from the perspectives of pulping effect, beverage quality, and pulping safety, the inventor found that when the startup time of the crushing blade from the start of operation to the constant speed crushing stage does not exceed 1 / 3 of the total time of a single crushing blade operation, compared to existing food processing machines, consumers can obtain lower pulping noise while maintaining the pulping effect, beverage quality, and pulping safety. Even the noise when the crushing blade is started will be felt to be lower.

[0070] Moreover, for the pulping method of the food processor of the present invention, in the process of cyclic crushing using the above-mentioned crushing method in the crushing stage, within the above-mentioned optional range, the crushing blade can also be controlled during two adjacent crushings. The relevant control parameters of each of the above-mentioned stages can be the same or different, and designers can combine and set them according to needs.

[0071] It should also be noted that the food processor of this embodiment uses a brushless motor to drive the crushing blade to rotate to crush the material. The brushless motor in the constant speed crushing stage has good rotation stability and can well control the rotation speed of the crushing blade. It is precisely based on the controllable characteristics of the brushless motor that the low noise crushing of the present invention is realized. However, in the actual pulping process, the rotation speed of the crushing blade is not a fixed value, and it will still vary within a certain range. For the constant speed crushing stage of this embodiment, the second rotation speed n2 is the average rotation speed of the constant speed crushing stage, and, in the constant speed crushing stage, the maximum rotation speed and / or the minimum rotation speed of the crushing blade relative to the average rotation speed, its fluctuation range does not exceed 1%. Similarly, the other rotation speeds mentioned in this embodiment also refer to the rotation speeds that fluctuate within the range of 1%. Of course, it should also be noted that the crushing method of the present invention is not limited to use in the crushing stage. The above-mentioned crushing method can also be used in the coarse crushing process of stirring the material.

[0072] The food processor of the present invention can be applied to food processors with upper motors, such as soymilk machines, or food processors with lower motors, such as wall-breaking machines, or food processors with motors and grinding cups installed in one. Of course, the food processor of the present invention can also be a food processor with automatic water inlet, automatic pulp discharge, and automatic cleaning that does not require hand washing.

[0073] Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A low-noise pulverizing method for a food processing machine, characterized in that: The food processor drives a crushing blade to crush materials by a brushless motor. During the pulping process, the crushing blade crushes materials once, which includes: Material pushing stage: controlling the crushing blade to increase the speed from 0 to the first speed at the first angular acceleration, the duration of the material pushing stage does not exceed 600ms, so as to instantly push the mixture of material and water to move; uniform acceleration stage: controlling the crushing blade to uniformly accelerate to the second speed at the second angular acceleration, so as to drive the material to accelerate, wherein the second angular acceleration is less than the first angular acceleration, and the second speed is greater than the first speed; Constant speed crushing stage: Control the crushing blade to maintain the second speed to crush the material.

2. The low-noise pulverizing method for a food processor according to claim 1, characterized in that: After the crushing blade is activated and before the uniform acceleration stage, a first speed reduction stage is provided in which the rotation speed of the crushing blade is reduced from the first rotation speed to the third rotation speed.

3. The low-noise pulverizing method for a food processor according to claim 2, characterized in that: In the first speed reduction stage, the crushing blade is not controlled, and the crushing blade is reduced in speed to the third speed.

4. The low-noise pulverizing method for a food processor according to claim 2, characterized in that: In the first speed reduction stage, the brushless motor is in a power-off state.

5. The low-noise pulverizing method for a food processor according to claim 2, characterized in that: The third rotation speed is not 0; Alternatively, the third speed is reduced to at least 1 / 3 of the first speed; Alternatively, the third rotation speed is 1000 rpm to 4000 rpm.

6. The low-noise pulverizing method for a food processor according to claim 2, characterized in that: The duration of the first speed reduction stage is 20 ms to 300 ms.

7. The low-noise pulverizing method for a food processor according to claim 1, characterized in that: The startup time of the crushing blade from the start of operation to the constant speed crushing stage accounts for no more than 1 / 3 of the total operation time of the crushing blade in a single operation.

8. The low-noise pulverizing method for a food processor according to claim 1, characterized in that: The first angular acceleration is 1500-6000 rad / s 2 ; Alternatively, the first rotation speed is selected within the range of 2000 rpm to 6000 rpm according to different pulping functions; Alternatively, the duration of the material pushing stage is 50 ms to 500 ms.

9. The low-noise pulverizing method for a food processor according to claim 1, characterized in that: The second angular acceleration is 65.4-628 rad / s 2 ; Alternatively, the duration of the uniform acceleration phase is 2s to 8s; Alternatively, the pulverizing time of the constant speed pulverizing stage is 10s to 30s; Alternatively, the second rotation speed is an average rotation speed in the constant speed crushing stage, and the fluctuation of the highest rotation speed and / or the lowest rotation speed in the constant speed crushing stage relative to the average rotation speed does not exceed 1%.

10. A pulping method for a food processing machine, characterized in that: The pulping method comprises: Crushing stage: In the crushing stage, the crushing method according to any one of claims 1 to 9 is cyclically used to crush the material to produce slurry; Heating stage: heating the prepared slurry.

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