Fruit juice hardness control method of snow melting machine and snow melting machine

Abstract

The invention relates to the field of design and manufacture of snow melting machines, and particularly discloses a juice hardness control method of a snow melting machine, which comprises the following steps: S1, pouring a liquid beverage into a charging basket; s2, stirring equipment and refrigeration equipment are started, and the initial temperature of the beverage is obtained through a temperature sensor; acquiring an initial rotating speed of the stirring equipment through a rotating speed sensor; the stirring time is recorded through a timer; s3, calculating the volume of the added liquid beverage; s4, calculating the minimum stirring time; s5, acquiring a real-time temperature; acquiring a real-time rotating speed; and S6, whether the stirring time reaches the lowest stirring time, whether the real-time temperature reaches the preset stop temperature and whether the real-time rotating speed reaches the preset stop rotating speed are judged, and when two of the three conditions are met, it is judged that work is completed. The embodiment of the invention further discloses a snow melting machine. According to the invention, the error of a single sensor can be eliminated, and automatic detection and control of the hardness of fruit juice can be realized.

Description

Technical Field

[0001] The invention relates to the field of design and manufacture of snow melting machines, and in particular to a method for controlling the hardness of juice of a snow melting machine and a snow melting machine. Background Art

[0002] Snow melting machine is a device that forms ice smoothies by cooling and stirring liquids such as juice. In order to control the hardness of ice smoothies, the state of the juice must be judged in real time so that the machine can be shut down in time. Existing detection and judgment methods include temperature detection, that is, the temperature of the juice is detected by a sensor, and when the temperature of the juice drops to a predetermined value, a prompt is issued or the machine is automatically shut down. The above method is the most commonly used method, but the hardness of different juices at the same temperature varies greatly, and ice particles will be generated in the later stage of operation. Some ice particles will contact the sensor and affect the detection results of the sensor, causing misjudgment. Another detection method is the current control method, that is, detecting the current of the stirring motor. When the juice freezes, the resistance of the stirring motor increases, and the current increases accordingly. When the current reaches the preset value, it automatically shuts down. This method can solve the problem of different freezing points of different juice formulas, and the control of the hardness of the juice is more accurate. However, the working current of the stirring motor is greatly affected by the ambient temperature, and some formulas will add solids such as fruit particles, which are easy to affect the resistance of the stirring motor in a short time, causing misjudgment. Summary of the invention

[0003] In order to solve the defects of the prior art, the present invention provides a method for controlling the hardness of juice of a snow melter and a snow melter, which can eliminate the error of a single sensor and realize automatic detection and control of the hardness of juice.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a method for controlling the softness and hardness of juice of a snow melt machine, comprising the following steps:

[0005] S1. Pour the liquid beverage into the barrel;

[0006] S2, the stirring device and the refrigeration device are started, and the initial temperature of the beverage is obtained through the temperature sensor provided in the material barrel; the initial speed of the stirring device is obtained through the speed sensor provided on the stirring device; and the stirring time is recorded through the timer;

[0007] S3, calculating the volume of the added liquid beverage by a weighing sensor connected to the barrel or by a proportional relationship between the initial speed and the no-load speed;

[0008] S4, calculating the minimum stirring time according to the volume of the added liquid beverage;

[0009] S5. During the stirring process, the real-time temperature is obtained by the stability sensor; the real-time speed is obtained by the speed sensor;

[0010] S6. Determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

[0011] As an improvement of the above scheme, the method for calculating the volume of the added liquid beverage through the proportional relationship between the initial speed and the no-load speed in step S3 is: liquid beverage volume = (no-load speed - initial speed) * a, a value range: 80-120, liquid beverage volume unit: milliliter.

[0012] As an improvement of the above scheme, the method for calculating the minimum stirring time by the volume of the added liquid beverage in step S4 is: minimum stirring time = (initial temperature + b) * liquid beverage volume / 1000, b value range: 5-9, minimum stirring time unit: second.

[0013] As an improvement on the above scheme, step S4 obtains the minimum stirring time and calculates the maximum stirring time at the same time, the method is: maximum stirring time = (initial temperature + c) * liquid beverage capacity * 1.2 / 1000, b value range: 8-12, minimum stirring time unit: second; when the snow melt machine working time reaches the maximum stirring time, it automatically stops.

[0014] As an improvement to the above solution, after obtaining the initial speed, it is compared with the no-load speed. If the difference between the no-load speed and the initial speed is less than a preset value, the machine automatically stops and a prompt is issued.

[0015] As an improvement of the above scheme, the stirring device includes a stirring blade, on which a resistance rod is provided, and the length of adjacent resistance rods changes linearly; when the resistance rod enters the liquid beverage, the resistance encountered by the stirring blade gradually increases, which serves as the effective real-time rotation speed.

[0016] As an improvement of the above solution, the rotation speed sensor is a Hall sensor arranged on the motor of the stirring device.

[0017] As an improvement of the above solution, the preset stop temperature is -4 to -10°C, and the preset stop rotation speed is 120 to 180 rpm less than the initial rotation speed.

[0018] Accordingly, an embodiment of the present invention further provides a snow melting machine, including a material barrel, a stirring device, a refrigeration device, a temperature sensor, a speed sensor, a timer and a control unit;

[0019] The refrigeration device, the stirring device and the temperature sensor are all arranged in the material barrel, the temperature sensor is used to obtain the initial temperature of the beverage, the speed sensor is arranged on the stirring device to obtain the initial speed of the stirring device, and the timer is used to record the stirring time;

[0020] The control unit can calculate the volume of the added liquid beverage through a weighing sensor connected to the barrel or through the proportional relationship between the initial speed and the no-load speed; calculate the minimum stirring time through the volume of the added liquid beverage; obtain the real-time temperature through the stability sensor during the stirring process; and obtain the real-time speed through the speed sensor;

[0021] The control unit can determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

[0022] Implementing the embodiments of the present invention has the following beneficial effects:

[0023] Using two of the above three conditions, namely, the minimum stirring time, the preset stop temperature and the preset stop speed, as the automatic judgment indicators of the softness and hardness of the slush machine juice can eliminate the error of a single sensor and realize the automatic detection and control of the softness and hardness of the juice. There is no need to pay real-time attention to the operation of the slush machine, and the user can simultaneously carry out the preparation of other beverages, freeing up manpower. The above three groups of situations are organically combined by the two groups of main indicators, and the three detection conditions complement each other, which can meet the production of slush with a variety of juice formulas, has a wide range of use, high fault tolerance, and is suitable for complex real-life usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a principle diagram of a method for controlling the softness and hardness of juice of a snowmelt machine according to the first embodiment of the present invention;

[0025] Figure 2 It is a principle diagram of a method for controlling the softness and hardness of juice of a snowmelt machine according to a second embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of a method for controlling the softness and hardness of juice of a snowmelt machine according to a third embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the stirring blade of the present invention.

[0028] Figure 5 Schematic diagram of the structure of the stirring blade of the fourth embodiment of the present invention

[0029] Figure 6 It is a structural schematic diagram of a snow melting machine according to the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0031] Embodiment 1

[0032] like Figure 1 As shown, the first embodiment of the present invention provides a method for controlling the softness and hardness of juice of a snow melt machine, comprising the following steps:

[0033] S1. Pour the liquid beverage into the barrel;

[0034] S2, the stirring device and the refrigeration device are started, and the initial temperature of the beverage is obtained through the temperature sensor provided in the material barrel; the initial speed of the stirring device is obtained through the speed sensor provided on the stirring device; and the stirring time is recorded through the timer;

[0035] S3, calculating the volume of the added liquid beverage by a weighing sensor connected to the barrel or by a proportional relationship between the initial speed and the no-load speed;

[0036] S4, calculating the minimum stirring time according to the volume of the added liquid beverage;

[0037] S5. During the stirring process, the real-time temperature is obtained by the stability sensor; the real-time speed is obtained by the speed sensor;

[0038] S6. Determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed. The above judgment method includes three situations where the conditions are met: 1. The minimum stirring time and the preset stop temperature are met, but the preset stop speed is not up to standard. First, the minimum stirring time is used to control the approximate working time of the snow melter to avoid the preset stop temperature from reaching the standard too quickly due to local icing and other problems in the early stage of work; secondly, the preset stop temperature reflects the basic state of the juice, that is, the juice has cooled down normally, avoiding the failure of the refrigeration equipment or the change of the ambient temperature, etc., which affects the quality of the finished juice, and can ensure that the juice is within the expected taste range at this time. The main reason for not reaching the preset stop speed may be that the viscosity of the juice is low, forming a loose smoothie. In this case, continuing to stir and cool will not affect the taste in a short time, and there is no need to waste extra processing time. 2. The minimum stirring time and the preset stop speed are met, but the preset stop temperature is not up to standard. First, the minimum stirring time is used to control the approximate working time of the snow melter to prevent larger ice crystals or solid particles from affecting the stirring speed during operation and causing the preset stop speed to be reached too quickly. Secondly, the preset stop speed reflects the basic state of the juice, that is, the juice has produced the expected resistance to the stirring equipment, and its viscosity meets the best taste. The failure to reach the preset stop temperature may be mainly due to the fact that the liquid currently added is closer to water and has a higher freezing point. If it continues to cool, it may cause the hardness of the smoothie to be too high, affecting the taste. 3. The preset stop temperature and the preset stop speed are met. The above two conditions directly reflect the current state of the juice, and the two conditions are met at the same time, proving that the possibility of a single sensor being misled is low. In the above situation, it may be that the juice is partially released during the stirring process, resulting in a decrease in the weight of the juice, or it may be that the current ambient temperature is low, resulting in a faster cooling of the juice.

[0039] It can be seen that using two of the above three conditions as automatic judgment indicators for the softness and hardness of the snow melt machine juice can eliminate the error of a single sensor and realize automatic detection and control of the softness and hardness of the juice. There is no need to pay real-time attention to the operation of the snow melt machine, and the user can simultaneously carry out tasks such as the preparation of other beverages, freeing up manpower. The above three groups of situations are organically combined by two groups of main indicators, and the three detection conditions complement each other, which can meet the production of snow mud with a variety of juice formulas. It has a wide range of use and a high fault tolerance rate. It is suitable for complex real-life usage scenarios. The smoothie is in the best taste when it is stopped, avoiding human deviations caused by relying on human experience to make smoothies.

[0040] Preferably, the preset stop temperature is -4°C, and the preset stop speed is 120 rpm less than the initial speed. The speed sensor is a Hall sensor provided on the motor of the stirring device.

[0041] The method for calculating the volume of the added liquid beverage by the proportional relationship between the initial speed and the no-load speed in step S3 is: liquid beverage volume = (no-load speed - initial speed) * 80 ml.

[0042] In step S4, the method for calculating the minimum stirring time according to the volume of the added liquid beverage is: minimum stirring time = (initial temperature + 5) * liquid beverage volume / 1000 seconds.

[0043] In order to achieve further intelligent control of stirring time, step S4 obtains the minimum stirring time and calculates the maximum stirring time at the same time, the method is: maximum stirring time = (initial temperature + 8) * liquid beverage capacity * 1.2 / 1000 seconds; when the snow melting machine working time reaches the maximum stirring time, it automatically stops.

[0044] If there is no material or less material in the barrel, the refrigeration equipment may be damaged. Therefore, the minimum material detection can also be carried out in the early stage. The specific method is: after obtaining the initial speed, compare it with the no-load speed. If the difference between the no-load speed and the initial speed is less than the preset value, it will automatically stop and issue a prompt.

[0045] Embodiment 2

[0046] like Figure 2 As shown, the second embodiment of the present invention provides a method for controlling the softness and hardness of juice of a snow melt machine, comprising the following steps:

[0047] S1. Pour the liquid beverage into the barrel;

[0048] S2, the stirring device and the refrigeration device are started, and the initial temperature of the beverage is obtained through the temperature sensor provided in the material barrel; the initial speed of the stirring device is obtained through the speed sensor provided on the stirring device; and the stirring time is recorded through the timer;

[0049] S3, calculating the volume of the added liquid beverage by a weighing sensor connected to the barrel or by a proportional relationship between the initial speed and the no-load speed;

[0050] S4, calculating the minimum stirring time according to the volume of the added liquid beverage;

[0051] S5. During the stirring process, the real-time temperature is obtained by the stability sensor; the real-time speed is obtained by the speed sensor;

[0052] S6. Determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

[0053] The preset stop temperature is -10°C, and the preset stop speed is 180 rpm less than the initial speed. The speed sensor is a Hall sensor provided on the motor of the stirring device.

[0054] The method for calculating the volume of the added liquid beverage by the proportional relationship between the initial speed and the no-load speed in step S3 is: liquid beverage volume = (no-load speed - initial speed) * 120 ml.

[0055] In step S4, the method for calculating the minimum stirring time according to the volume of the added liquid beverage is: minimum stirring time = (initial temperature + 9) * liquid beverage volume / 1000 seconds.

[0056] In order to achieve further intelligent control of stirring time, step S4 obtains the minimum stirring time and calculates the maximum stirring time at the same time, the method is: maximum stirring time = (initial temperature + 12) * liquid beverage capacity * 1.2 / 1000 seconds; when the snow melting machine working time reaches the maximum stirring time, it automatically stops.

[0057] If there is no material or less material in the barrel, the refrigeration equipment may be damaged. Therefore, the minimum material detection can also be carried out in the early stage. The specific method is: after obtaining the initial speed, compare it with the no-load speed. If the difference between the no-load speed and the initial speed is less than the preset value, it will automatically stop and issue a prompt.

[0058] Embodiment 3

[0059] like Figure 3 As shown, the third embodiment of the present invention provides a method for controlling the softness and hardness of juice of a snow melt machine, comprising the following steps:

[0060] S1. Pour the liquid beverage into the barrel;

[0061] S2, the stirring device and the refrigeration device are started, and the initial temperature of the beverage is obtained through the temperature sensor provided in the material barrel; the initial speed of the stirring device is obtained through the speed sensor provided on the stirring device; and the stirring time is recorded through the timer;

[0062] S3, calculating the volume of the added liquid beverage by a weighing sensor connected to the barrel or by a proportional relationship between the initial speed and the no-load speed;

[0063] S4, calculating the minimum stirring time according to the volume of the added liquid beverage;

[0064] S5. During the stirring process, the real-time temperature is obtained by the stability sensor; the real-time speed is obtained by the speed sensor;

[0065] S6. Determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

[0066] The preset stop temperature is -7°C, and the preset stop speed is 150 rpm less than the initial speed. The speed sensor is a Hall sensor provided on the motor of the stirring device.

[0067] In step S3, the method for calculating the volume of the added liquid beverage by the proportional relationship between the initial speed and the no-load speed is: liquid beverage volume = (no-load speed - initial speed) * 100 ml.

[0068] In step S4, the method for calculating the minimum stirring time according to the volume of the added liquid beverage is: minimum stirring time = (initial temperature + 7) * liquid beverage volume / 1000 seconds.

[0069] In order to achieve further intelligent control of stirring time, step S4 obtains the minimum stirring time and calculates the maximum stirring time at the same time, the method is: maximum stirring time = (initial temperature + 10) * liquid beverage capacity * 1.2 / 1000 seconds; when the snow melting machine working time reaches the maximum stirring time, it automatically stops.

[0070] If there is no material or less material in the barrel, the refrigeration equipment may be damaged. Therefore, the minimum material detection can also be carried out in the early stage. The specific method is: after obtaining the initial speed, compare it with the no-load speed. If the difference between the no-load speed and the initial speed is less than the preset value, it will automatically stop and issue a prompt.

[0071] Embodiment 4

[0072] Combination Figure 4 and Figure 5 As shown, the difference from the above embodiment is that the stirring device includes a stirring blade 1, and the stirring blade 1 includes a ring 11, on which a resistance rod 2 is provided, and the length of adjacent resistance rods 2 changes linearly; when the resistance rod 2 enters the liquid beverage, the resistance encountered by the stirring blade 1 gradually increases, and this is used as the effective real-time rotation speed.

[0073] It should be noted that when the Hall sensor is used to detect the speed of the motor, the contact between the stirring blade 1 and the juice at different positions may cause fluctuations in the speed, and even reduce the speed of the stirring blade 1 within a certain period of time. However, this is actually caused by uneven freezing in the juice and does not reflect the overall state of the juice. In order to avoid the influence of the above factors, the present embodiment adds a resistance rod 2 to the stirring blade 1. Preferably, the resistance rod 2 is arranged within the half circumference of the stirring blade 1, so that in the stirring process, there are different states in which most of the resistance rod 2 is in the juice and most of the resistance rod 2 is above the juice. When the resistance rod 2 enters the juice as the stirring blade 1 rotates, the number of resistance rods 2 gradually increases, and the length of the resistance rod 2 entering the juice gradually increases, which will generate a stable and increasing resistance to the stirring blade 1. In this process, the speed obtained is used as the real-time speed. When the stirring blade 1 leaves the juice, the speed of the stirring blade 1 is no longer used as the real-time speed. By adopting the above method, the speed of the stirring blade 1 can be artificially slowed down, and the real-time speed is detected during this time, and the data obtained is more accurate. The resistance rod 2 can be arranged between the brackets on both sides of the stirring blade 1, which can eliminate the influence of the brackets and other parts of the stirring blade 1 on the stirring speed. As for how to judge whether the resistance rod 2 is in the juice in the current state, on the one hand, it can rely on the change amplitude of the rotation speed, because after the resistance rod enters the juice, the rotation speed will produce a stable deceleration rate. When the above deceleration rate is detected, it can be considered that the resistance rod is in the working position. On the other hand, according to the arrangement characteristics of the resistance rod 2, a mechanical trigger structure can be set on the stirring device, such as a push switch 21 provided on one side of the stirring blade, and a pressure block 22 is provided in the corresponding half circle of the resistance rod 2. The pressure block 22 will press the push switch 21. When the resistance rod 22 rotates to the top of the juice, the pressure block 22 also leaves the push switch 21 synchronously. The rotation position of the resistance rod 2 can be determined by the signal of the push switch 21.

[0074] Embodiment 5

[0075] Combination Figure 6 As shown, the fifth embodiment of the present invention further provides a snow melting machine, including a material barrel 3, a stirring device 4, a refrigeration device 5, a temperature sensor 6, a speed sensor 7, a timer (not shown in the figure) and a control unit (not shown in the figure);

[0076] The refrigeration device 5, the stirring device 4 and the temperature sensor 6 are all arranged in the material barrel 3. The temperature sensor 6 is used to obtain the initial temperature of the beverage. The speed sensor 7 is arranged on the motor 8 of the stirring device 4 to obtain the initial speed of the stirring device 4. The motor 8 drives the stirring blade 1 to rotate through the rotating shaft 9. The timer is used to record the stirring time.

[0077] The control unit can calculate the volume of the added liquid beverage through a weighing sensor connected to the barrel 3 or through the proportional relationship between the initial speed and the no-load speed; calculate the minimum stirring time through the volume of the added liquid beverage; obtain the real-time temperature through the stability sensor during the stirring process; obtain the real-time speed through the speed sensor 7;

[0078] The control unit can determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

[0079] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling the softness and hardness of juice in a snow melt machine, characterized in that: The following steps are involved: S1. Pour the liquid beverage into the barrel; S2, the stirring device and the refrigeration device are started, and the initial temperature of the beverage is obtained through the temperature sensor provided in the material barrel; the initial speed of the stirring device is obtained through the speed sensor provided on the stirring device; Record the stirring time by a timer; S3, calculating the volume of the added liquid beverage by a weighing sensor connected to the barrel or by a proportional relationship between the initial speed and the no-load speed; S4, calculating the minimum stirring time according to the volume of the added liquid beverage; S5. During the stirring process, the real-time temperature is obtained by the stability sensor; the real-time speed is obtained by the speed sensor; S6. Determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

2. The method for controlling the softness and hardness of juice of a snow melt machine according to claim 1, characterized in that: The method for calculating the volume of the added liquid beverage by the proportional relationship between the initial speed and the no-load speed in step S3 is: liquid beverage volume = (no-load speed - initial speed) * a, where a ranges from 80 to 120, and the unit of liquid beverage volume is milliliters.

3. The method for controlling the softness and hardness of juice of a snow melt machine as claimed in claim 2, characterized in that: In step S4, the method for calculating the minimum stirring time according to the volume of the added liquid beverage is: minimum stirring time = (initial temperature + b) * liquid beverage volume / 1000, b value range: 5-9, minimum stirring time unit: second.

4. The method for controlling the softness and hardness of juice of a snow melt machine according to claim 1, characterized in that: Step S4 obtains the minimum stirring time and calculates the maximum stirring time at the same time, the method is: maximum stirring time = (initial temperature + c) * liquid beverage capacity * 1.2 / 1000, b value range: 8-12, minimum stirring time unit: second; when the snow melter working time reaches the maximum stirring time, it automatically stops.

5. The method for controlling the softness and hardness of juice of a snow melt machine according to claim 1, characterized in that: After obtaining the initial speed, it is compared with the no-load speed. If the difference between the no-load speed and the initial speed is less than the preset value, the machine will automatically stop and issue a prompt.

6. The method for controlling the softness and hardness of juice of a snow melt machine according to claim 1, characterized in that: The stirring device comprises a stirring blade, on which a resistance rod is provided, and the lengths of adjacent resistance rods vary linearly; when the resistance rod enters the liquid beverage, the resistance experienced by the stirring blade gradually increases, which serves as the effective real-time rotation speed.

7. The method for controlling the softness and hardness of juice in a snow melt machine according to claim 1, characterized in that: The rotation speed sensor is a Hall sensor arranged on the motor of the stirring device.

8. The method for controlling the softness and hardness of juice in a snow melt machine according to claim 1, characterized in that: The preset stop temperature is -4 to -10°C, and the preset stop rotation speed is 120 to 180 rpm less than the initial rotation speed.

9. A snow melting machine, characterized in that: Including material barrel, mixing equipment, refrigeration equipment, temperature sensor, speed sensor, timer and control unit; The refrigeration device, the stirring device and the temperature sensor are all arranged in the material barrel, the temperature sensor is used to obtain the initial temperature of the beverage, the speed sensor is arranged on the stirring device to obtain the initial speed of the stirring device, and the timer is used to record the stirring time; The control unit can calculate the volume of the added liquid beverage through a weighing sensor connected to the barrel or through the proportional relationship between the initial speed and the no-load speed; and calculate the minimum stirring time through the volume of the added liquid beverage; During the stirring process, the real-time temperature is obtained through the stability sensor; the real-time speed is obtained through the speed sensor; The control unit can determine whether the stirring time reaches the minimum stirring time, whether the real-time temperature reaches the preset stop temperature, and whether the real-time speed reaches the preset stop speed. When two of the above three conditions are met, it is determined that the work is completed.

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