Food processor and rotational speed control device therefor

Abstract

The present application relates to a kind of food processor and its rotating speed control device, belong to the technical field of life electric appliance. Wherein, rotating speed control device includes motor and speed regulation circuit, the output end of motor is connected the stirring piece of food processor;Rotating speed control device top is equipped with button area, button area is equipped with the first button switch and second button switch connected in speed regulation circuit;When the first button switch is pressed, motor operates at the first rotating speed matching the first processing mode, and the first button switch is adjacent to the second button switch arrangement;When the first button switch and the second button switch are simultaneously pressed, motor operates at the second rotating speed matching the second processing mode;Wherein, the time required for the second processing mode is greater than the time required for the first processing mode.In the processing mode of long processing time, user can replace single finger pressing one button by pressing two button switches with palm simultaneously, so as to avoid the fatigue produced by long time pressing of finger.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more specifically, to a food processing machine and its speed control device. Background Technology

[0002] Food processors on the market require a speed control circuit to switch between different speeds. This speed control circuit usually uses a chopper circuit based on silicon controlled rectifiers. Two touch buttons on the top of the food processor head trigger the high and low speed settings, and a temperature controller connected in series with the motor in the main circuit protects the motor and prevents it from being damaged by overheating.

[0003] The drawback of existing food processors is that when using one speed for a long time, it is necessary to press the button continuously with your finger for several minutes, which leads to finger fatigue. Summary of the Invention

[0004] The purpose of this invention is to provide a food processing machine and its speed control device. In processing modes with long processing times, users can press two button switches simultaneously with their palms instead of pressing one button with a single finger, while the motor still runs at the speed matched to the processing mode with long processing times, thereby avoiding fatigue caused by prolonged finger pressing.

[0005] To achieve the above objectives, in a first aspect, the speed control device for a food processor provided by the present invention includes a motor and a speed regulating circuit. The output end of the motor is connected to the stirring component of the food processor. The top of the speed control device is provided with a button area, which is provided with a first button switch and a second button switch connected in the speed regulating circuit, and the first button switch and the second button switch are arranged adjacent to each other. When the first button switch is pressed, the motor operates at a first speed matching a first processing mode. When the first button switch and the second button switch are pressed simultaneously, the motor operates at a second speed matching a second processing mode. The duration required for the second processing mode is longer than the duration required for the first processing mode.

[0006] Optionally, in one embodiment, the first processing mode is a meat grinding mode, and the second processing mode is a dough kneading mode.

[0007] Optionally, in one embodiment, the speed control circuit includes a first speed circuit and a second speed circuit, wherein the second speed circuit is provided with a unidirectional diode to reduce the power of the motor;

[0008] Both the first push-button switch and the second push-button switch are single-pole double-throw switches, and the normally closed terminal and normally open terminal of the second push-button switch are respectively selected for the first speed circuit and the second speed circuit. The first push-button switch is set on the first speed circuit.

[0009] Optionally, in one embodiment, the common terminal of the second push-button switch is connected to the first output terminal of the power supply circuit, and the normally open terminal is connected to the positive terminal of the unidirectional diode;

[0010] The common terminal of the first push-button switch is connected to the normally closed terminal of the second push-button switch, and the normally open terminal is connected to the negative terminal of the unidirectional diode. The negative terminal of the unidirectional diode is also connected to the first connection terminal of the motor, and the second connection terminal of the motor is connected to the second output terminal of the power supply circuit.

[0011] Optionally, in one embodiment, the speed control circuit includes a first speed circuit and a second speed circuit connected in parallel, the first push-button switch is located on the first speed circuit, the second push-button switch is located on the second speed circuit, and the first speed circuit is provided with a unidirectional diode to reduce the power of the motor.

[0012] Optionally, in one embodiment, both the first push button switch and the second push button switch are single-pole double-throw switches, and the common terminal of both the first push button switch and the second push button switch is connected to the first output terminal of the power supply circuit, and the normally closed terminals are both in a floating state.

[0013] The normally open terminal of the first push-button switch is connected to the positive terminal of the unidirectional diode, the normally open terminal of the second push-button switch is connected to the first connection terminal of the motor, and the second connection terminal of the motor is connected to the second output terminal of the power supply circuit.

[0014] Optionally, in one embodiment, a bipolar temperature controller is provided on the circuit that controls the higher motor speed in the first speed circuit and the second speed circuit. The common terminal of the bipolar temperature controller is connected to the normally open terminal of the push-button switch on the corresponding circuit, the low-temperature conducting terminal is connected to the positive terminal of the unidirectional diode, and the high-temperature conducting terminal is connected to the negative terminal of the unidirectional diode.

[0015] Optionally, in one embodiment, a temperature controller is provided between the motor and the power supply circuit to protect the motor.

[0016] Optionally, in one embodiment, the button area is a curved surface suitable for palm pressing.

[0017] Secondly, the food processing machine provided by the present invention includes: a cup body, a stirring component, and a speed control device as described above. The stirring component is disposed at the bottom of the speed control device, and the speed control device is fixed to the top of the cup body by means of threaded screwing or snap-fitting.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] This invention controls the motor to operate at different speeds via a first and a second button switch, thereby driving the mixing component to mix different ingredients in different processing modes. Since different processing modes require different processing times, pressing a button with a single finger to activate a longer processing mode, coupled with machine vibration, can easily cause finger fatigue. However, by pressing both the first and second buttons simultaneously, the motor operates at a speed matching the longer processing mode. In this case, the entire button area can be pressed with the palm of the hand, eliminating concerns about accidental triggering due to the larger hand area.

[0020] This invention incorporates a bipolar temperature controller in the circuit controlling the high speed of the motor. The common terminal of the bipolar temperature controller is connected to the normally open terminal of a push-button switch in the corresponding circuit. The low-temperature conducting terminal is connected to the positive terminal of a unidirectional diode, and the high-temperature conducting terminal is connected to the negative terminal of the unidirectional diode. When the user uses the high-speed setting for an extended period, causing the motor temperature to rise rapidly and reach the switching temperature of the bipolar temperature controller, the low-temperature conducting terminal of the bipolar temperature controller conducts. Current flows through the unidirectional diode, reducing power by half, decreasing the speed, and reducing heat generation. This automatically switches to a low-speed setting to protect the motor from excessively rapid temperature rise during erroneous operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a food processing machine according to an embodiment of the present invention;

[0022] Figure 2 This is a circuit diagram of a control circuit according to one embodiment of the present invention;

[0023] Figure 3 This is a power supply voltage diagram of the power supply circuit in an embodiment of the present invention;

[0024] Figure 4 This is a voltage diagram of the motor according to an embodiment of the present invention;

[0025] Figure 5 This is a protection circuit diagram of the control circuit in one embodiment of the present invention;

[0026] Figure 6 A circuit diagram of a control circuit according to another embodiment of the present invention;

[0027] Figure 7 This is a protection circuit diagram of the control circuit in another embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below in conjunction with embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this invention.

[0029] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar terms used in this invention, mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] See Figure 1 and Figure 2 The food processor provided in this embodiment includes: a cup body 100, a stirring component (not shown in the figure), and a speed control device 200. The speed control device can be top-mounted or bottom-mounted; in this embodiment, it is top-mounted. The cup body 100 is cup-shaped or bowl-shaped and is used to hold the food to be stirred. A lid 101 can be provided on the top of the cup body 100, and the lid 101 is fixedly connected to the speed control device 200. Alternatively, the speed control device 200 can be directly fixed to the top of the cup body 100 by screwing or snapping. The stirring component is installed at the bottom of the speed control device 200 and extends into the cup body 100 to stir the food inside the cup body 100.

[0031] The speed control device 200 includes a motor 202 and a speed regulating circuit 203. The output end of the motor 202 is connected to the stirring component of the food processor. The top of the speed control device 200 is provided with a button area 205, which is provided with a first button switch S1 and a second button switch S2 connected to the speed regulating circuit 203. When the first button switch S1 is pressed, the motor 202 runs at a first speed matching the first processing mode, and the first button switch S1 and the second button switch S2 are arranged adjacent to each other. When the second button switch S2 is pressed, the motor 202 runs at a second speed matching the second processing mode. When the first button switch S1 and the second button switch S2 are pressed simultaneously, the motor 202 runs at a second speed matching the second processing mode. The time required for the second processing mode is longer than the time required for the first processing mode.

[0032] In this embodiment, both the first button switch S1 and the second button switch S2 are microswitches without self-locking. The first button switch S1 and the second button switch S2 are connected to the speed control circuit 203. The first button switch S1 and the second button switch S2 control the motor 202 to run at different speeds, thereby driving the mixing component to mix different ingredients in different processing modes. Since different processing modes require different processing times, pressing the button with a single finger to activate a longer processing mode, combined with machine vibration, can easily cause finger fatigue. However, by pressing the adjacent first button switch S1 and the second button switch S2 simultaneously, the motor 202 runs at a speed matching the processing mode with a longer processing time. In this case, the palm can be used to press the entire button area without worrying about accidental triggering due to the large palm area.

[0033] In this embodiment, the speed control device 200 also includes a housing 201, with the motor 202 and speed control circuit 203 disposed within the housing 201. The button area 205 is located at the top of the housing 201, making it easier to press with a finger or palm to trigger the button, and is more suitable for palm pressing to accommodate prolonged stirring operations, such as in the second processing mode. Furthermore, the button area 205 is designed as a curved surface suitable for palm pressing, thus requiring less effort.

[0034] In this embodiment, when the first button switch S1 and the second button switch S2 are pressed simultaneously, the motor 202 runs at a second speed. The second speed is the motor speed with a longer processing time. It can be that the first processing mode is a meat grinding mode and the second processing mode is a dough kneading mode, with the processing time of the dough kneading mode being longer than that of the meat grinding mode; or it can be that the first processing mode is a vegetable grinding mode and the second processing mode is a meat grinding mode, with the processing time of the meat grinding mode being longer than that of the vegetable grinding mode.

[0035] In one embodiment, the first processing mode is a meat grinding mode, and the second processing mode is a dough kneading mode. The mixing unit includes a mixing blade for grinding meat and a mixing rod for kneading dough. When the ingredient to be mixed is meat, the mixing unit is replaced with a mixing blade, and the first button switch S1 is pressed, causing the motor 202 to drive the mixing blade at a first speed to grind the meat. The first speed is a high speed, which is beneficial for the grinding effect, and the working time is usually within 5-60 seconds. When the ingredient to be mixed is dough, the mixing unit is replaced with a mixing rod, and the second button switch S2 is pressed, causing the motor 202 to drive the mixing rod at a second speed to mix the dough. The second speed is a low speed, which is beneficial for the dough to form a ball, and the working time is usually within 1-5 minutes. Since the dough kneading time is relatively long, if the fingers continuously press the second button for a long time, it is easy to cause finger fatigue. At this time, the entire palm can be pressed on the button area, and the first button switch S1 and the second button switch S2 can be pressed simultaneously, while the motor 202 still drives the mixing rod at the second speed to knead the dough.

[0036] Specifically, the speed control circuit 203 includes a power supply circuit, a first speed circuit, and a second speed circuit. The second speed circuit includes a component that reduces motor power, such as a unidirectional diode.

[0037] For details, see Figure 2 Both the first push-button switch S1 and the second push-button switch S2 are single-pole double-throw switches. The normally closed terminal 6 and normally open terminal 4 of the second push-button switch S2 respectively select the first speed circuit and the second speed circuit. The first push-button switch S1 is set on the first speed circuit. The power supply circuit is AC mains. The common terminal 5 of the second push-button switch S2 is connected to the first output terminal (live wire L) of the power supply circuit, and the normally open terminal 4 is connected to the positive terminal of the unidirectional diode D1. The common terminal 2 of the first push-button switch S1 is connected to the normally closed terminal 6 of the second push-button switch S2, and the normally open terminal 1 is connected to the negative terminal of the unidirectional diode D1. The negative terminal of the unidirectional diode D1 is also connected to the first connection terminal of the motor 202, and the second connection terminal of the motor 202 is connected to the second output terminal of the power supply circuit.

[0038] Specifically, the power supply circuit is AC mains power, and a temperature controller 204 is installed between the power supply circuit and the motor 202 to protect the motor 202. The common terminal 5 of the second push-button switch S2 is connected to the live wire L of the mains power, the normally open terminal 6 is connected to the positive terminal of the unidirectional diode D1, the normally closed terminal 4 is connected to the common terminal 2 of the first push-button switch S1, the normally closed terminal 3 of the first push-button switch S1 is floating, the normally open terminal 1 of the first push-button switch S1, one power input terminal of the motor 202 and the negative terminal of the unidirectional diode D1 are connected together, the other power input terminal of the motor 202 is connected to the temperature controller 204, and the other end of the temperature controller 204 is connected to the neutral wire N of the mains power.

[0039] When the food processor is powered on and no buttons are pressed, the normally closed terminal 4 of the second button switch S2 is closed, and the normally open terminal 3 of the first button switch S1 is closed, the circuit is open, and the motor does not work. When the first button switch S1 is pressed, the normally closed terminal 1 of the first button switch S1 is closed, and the first button switch S1, the second button switch S2, the power supply circuit, and the motor 202 form a closed circuit, that is, the first speed circuit is conducting, and the motor 202 runs at maximum power. When the second button switch S2 is pressed, the normally open terminal 6 of the second button switch S2 is closed, and a closed circuit is formed with the motor 202 and the power supply circuit through the unidirectional diode D1, that is, the second speed circuit is conducting. (See [link]). Figure 3 and Figure 4 Due to the unidirectional conductivity of the unidirectional diode D1, only the positive half-cycle current can pass through the motor 202. Therefore, the power of the motor 202 is only half of that when the first speed circuit is on, and the speed decreases. When the first button switch S1 and the second button switch S2 are pressed at the same time, the normally closed terminal 6 of the second button switch S2 is turned on, forming a closed circuit with the motor 202 and the power supply circuit through the unidirectional diode D1. The first speed circuit is turned off, and the second speed circuit is turned on. Due to the unidirectional conductivity of the unidirectional diode D1, only the positive half-cycle current can pass through the motor 202. Therefore, the power of the motor 202 is only half of that when the first speed circuit is on, and it still runs at low speed.

[0040] This embodiment achieves two-stage speed regulation of motor 202 using only a single unidirectional diode D1. The circuit is simple and reliable. In addition, this circuit allows users to press the first button switch S1 and the second button switch S2 simultaneously with their palm during long processing modes, such as dough kneading mode. At this time, the speed is still suitable for the low speed of dough kneading mode, avoiding the problem of fatigue caused by pressing a single button for a long time with your fingers.

[0041] Further, see Figure 5 A bipolar temperature controller KS3 is installed on the first speed control circuit for the higher speed of motor 202. The circuit connection of the bipolar temperature controller KS3 is similar to that of a single-pole double-throw switch, but the action is not external force pressing, but rather the bimetallic strip deforms when it exceeds a specific temperature, switching the circuit connection. The switching temperature of the bipolar temperature controller is 20-40 degrees Celsius lower than the tripping temperature of the temperature controller. The bipolar temperature controller and the temperature controller are fixed on the silicon steel stator of the AC motor. In this embodiment, the common terminal 8 of the bipolar temperature controller KS3 is connected to the normally open terminal 1 of the first push-button switch S1, the low-temperature conducting terminal 7 is connected to the positive terminal of the unidirectional diode D1, and is also connected to the normally open terminal 4 of the second push-button switch S2, and the high-temperature conducting terminal 9 is connected to the negative terminal of the unidirectional diode D1, and is also connected to one end of the motor 202.

[0042] When the user uses the high speed setting for a long time, causing the temperature of motor 202 to rise rapidly, once the temperature of motor 202 reaches the switching temperature of bipolar temperature controller KS3, the low-temperature conducting terminal 7 of bipolar temperature controller KS3 will be turned on. The current passes through unidirectional diode D1, the power is reduced by half, the speed is reduced, and the heat generation is reduced. Thus, the motor is protected from excessively rapid temperature rise due to misoperation by automatically switching to the low speed setting.

[0043] In another embodiment, the first processing mode is a vegetable grinding mode, and the second processing mode is a meat grinding mode. When the ingredient to be ground is vegetables, pressing the first button switch S1 causes the motor 202 to drive the mixing blades at a first rotational speed to grind the vegetables. Since vegetables are relatively easy to grind, the first rotational speed is a low speed setting. When the ingredient to be ground is meat, pressing the second button switch S2 causes the motor 202 to drive the mixing blades at a second rotational speed to grind the meat. The second rotational speed is a high speed setting. Since the meat grinding time is relatively long, pressing the second button continuously for a long time can easily cause finger fatigue. In this case, the entire palm can be pressed on the button area to press the first button switch S1 and the second button switch S2 simultaneously, while the motor 202 continues to drive the mixing blades at the second rotational speed to grind the meat.

[0044] See Figure 6 The first speed circuit and the second speed circuit are connected in parallel. The first push-button switch S1 is located on the first speed circuit, and the second push-button switch S2 is located on the second speed circuit. Both the first push-button switch S1 and the second push-button switch S2 are single-pole double-throw switches. The common terminal 2 of the first push-button switch S1 and the common terminal 5 of the second push-button switch S2 are both connected to the first output terminal of the power supply circuit, and the normally closed terminals are both in a floating state. The normally open terminal 1 of the first push-button switch S1 is connected to the positive terminal of the unidirectional diode D1, and the normally open terminal 4 of the second push-button switch S2 is connected to the first connection terminal of the motor 202. The second connection terminal of the motor 202 is connected to the second output terminal of the power supply circuit.

[0045] Specifically, the power supply circuit is AC mains power, and a temperature controller 204 is installed between the power supply circuit and the motor 202 to protect the motor 202. The common terminal 2 of the first push-button switch S1 and the common terminal 5 of the second push-button switch S2 are connected to the live wire L of the mains power, and the normally closed terminals are both floating. The normally open terminal 1 of the first push-button switch S1 is connected to the positive terminal of the unidirectional diode D1. The normally open terminal 4 of the second push-button switch S2, the negative terminal of the unidirectional diode D1, and one power input terminal of the motor 202 are connected together. The other power input terminal of the motor 202 is connected to the temperature controller 204, and the other end of the temperature controller 204 is connected to the neutral wire N of the mains power.

[0046] When the power is on but no button is pressed, the normally closed terminal 3 of the first button switch S1 is closed, and the normally closed terminal 6 of the second button switch S2 is closed, breaking the circuit and preventing the motor 202 from operating. When only the second button switch S2 is pressed, the normally open terminal 4 of the second button switch S2 is closed, forming a closed loop with the second button switch S2, the power supply circuit, and the motor 202, thus activating the second speed circuit. At this time, the motor 202 operates at maximum power. When only the first button switch S1 is pressed, the normally open terminal 1 of the first button switch S1 is closed, forming a closed loop with the motor 202 and the power supply circuit through the unidirectional diode D1, thus activating the first speed circuit. (See [link to relevant documentation]). Figure 3 and Figure 4 Due to the unidirectional conductivity of the unidirectional diode D1, only the positive half-cycle current can pass through the motor 202. Therefore, the power of the motor 202 is only half of that when the second speed circuit is on, and the speed decreases. When the first button switch S1 and the second button switch S2 are pressed at the same time, the normally open terminal 1 of the first button switch S1 is turned on, and the normally open terminal 4 of the second button switch S2 is turned on. The two are connected in parallel and then form a closed loop with the motor 202 and the power supply circuit. Since the unidirectional diode D1 is short-circuited by the second button switch S2, the first speed circuit has no effect. At this time, the motor 202 runs at maximum power.

[0047] Further, see Figure 7 The second speed control circuit for the higher speed of motor 202 is equipped with a bipolar temperature controller KS3. The common terminal 8 of the bipolar temperature controller KS3 is connected to the normally open terminal 4 of the second push button switch S2. The low temperature conducting terminal 7 is connected to the positive terminal of the unidirectional diode D1 and is also connected to the normally open terminal 1 of the first push button switch S1. The high temperature conducting terminal 9 is connected to the negative terminal of the unidirectional diode D1 and is also connected to one end of motor 202.

[0048] When the user uses the high speed setting for too long, causing the temperature of motor 202 to rise rapidly, once the temperature of motor 202 reaches the switching temperature of bipolar temperature controller KS3, the low-temperature conducting terminal 7 of bipolar temperature controller KS3 will be turned on. The current passes through unidirectional diode D1, the power is reduced by half, the speed is reduced, and the heat generation is reduced. Thus, the motor is protected from excessively rapid temperature rise due to misoperation by automatically switching to the low speed setting.

Claims

1. A speed control device for a food processing machine, characterized in that, The speed control device includes a motor and a speed regulation circuit. The output end of the motor is connected to the stirring component of the food processor. The top of the speed control device has a button area, which includes a first button switch and a second button switch connected to the speed regulation circuit. The first button switch and the second button switch are arranged adjacent to each other. When the first button switch is pressed, the motor operates at a first speed matching a first processing mode. When both the first and second button switches are pressed simultaneously, the motor operates at a second speed matching a second processing mode. The duration required for the second processing mode is longer than that required for the first processing mode. The speed regulation circuit includes a first speed circuit and a second speed circuit. The second speed circuit has a unidirectional diode that reduces the power of the motor. Both the first and second push-button switches are single-pole double-throw switches. The normally closed and normally open terminals of the second push-button switch are respectively selected for the first speed circuit and the second speed circuit. The first push-button switch is located on the first speed circuit. A bipolar temperature controller is provided on the circuit controlling the higher motor speed in both the first and second speed circuits. The common terminal of the bipolar temperature controller is connected to the normally open terminal of the push-button switch on the corresponding circuit. The low-temperature conducting terminal is connected to the positive terminal of the unidirectional diode, and the high-temperature conducting terminal is connected to the negative terminal of the unidirectional diode. The common terminal of the second push-button switch is connected to the first output terminal of the power supply circuit, and the normally open terminal is connected to the positive terminal of the unidirectional diode. The common terminal of the first push-button switch is connected to the normally closed terminal of the second push-button switch, and the normally open terminal is connected to the negative terminal of the unidirectional diode. The negative terminal of the unidirectional diode is also connected to the first connection terminal of the motor, and the second connection terminal of the motor is connected to the second output terminal of the power supply circuit.

2. The speed control device according to claim 1, characterized in that, The first processing mode is the meat grinding mode, and the second processing mode is the dough kneading mode.

3. The speed control device according to claim 1, characterized in that, A temperature controller is installed between the motor and the power supply circuit to protect the motor.

4. The speed control device according to claim 1, characterized in that, The button area is a curved surface suitable for palm pressing.

5. A speed control device for a food processing machine, characterized in that, The speed control device includes a motor and a speed regulation circuit. The output end of the motor is connected to the stirring component of the food processor. The top of the speed control device has a button area, which includes a first button switch and a second button switch connected to the speed regulation circuit. The first button switch and the second button switch are arranged adjacent to each other. When the first button switch is pressed, the motor operates at a first speed matching a first processing mode. When both the first and second button switches are pressed simultaneously, the motor operates at a second speed matching a second processing mode. The duration required for the second processing mode is longer than that required for the first processing mode. The speed regulation circuit includes a first speed circuit and a second speed circuit connected in parallel. The first button switch is located on the first speed circuit, and the second button switch is located on the second speed circuit. A unidirectional diode for reducing motor power is provided on the first speed circuit. Both the first and second button switches are single-pole double-throw switches. The common terminals of both switches are connected to the first output terminal of the power supply circuit, and their normally closed terminals are in a floating state. The normally open terminal of the first push-button switch is connected to the positive terminal of the unidirectional diode, the normally open terminal of the second push-button switch is connected to the first connection terminal of the motor, and the second connection terminal of the motor is connected to the second output terminal of the power supply circuit; a bipolar temperature controller is provided on the circuit that controls the higher motor speed in the first speed circuit and the second speed circuit, the common terminal of the bipolar temperature controller is connected to the normally open terminal of the push-button switch on the corresponding circuit, the low temperature conducting terminal is connected to the positive terminal of the unidirectional diode, and the high temperature conducting terminal is connected to the negative terminal of the unidirectional diode.

6. The speed control device according to claim 5, characterized in that, A temperature controller is installed between the motor and the power supply circuit to protect the motor.

7. The speed control device according to claim 5, characterized in that, The button area is a curved surface suitable for palm pressing.

8. A food processing machine, characterized in that, The device includes a cup body, a stirring component, and a speed control device as described in any one of claims 1-7, wherein the stirring component is disposed at the bottom of the speed control device, and the speed control device is fixed to the top of the cup body by means of threaded screwing or snap-fit.

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