A speed regulation and forward and reverse control circuit for an electric grinder and a control method thereof

Abstract

The present invention discloses a speed regulation, forward and reverse control circuit of an electric grinder and a control method thereof, comprising a power supply circuit, a drive circuit and a control circuit, wherein the control circuit is connected to the power supply circuit and the drive circuit respectively, the power supply circuit comprises a charging circuit, a power supply circuit and a power supply protection circuit, the power supply protection circuit is used to protect the power supply circuit, the charging circuit and the power supply protection circuit are respectively connected to the control circuit, the control circuit comprises a main control circuit and an inverted sensor, the main control circuit is respectively connected to the inverted sensor, the charging circuit, the power supply protection circuit and the drive circuit, and the drive circuit is connected to a motor. The present invention can realize stepless speed regulation, can run more accurately and smoothly, and can automatically reverse without increasing any component cost, which is conducive to withdrawing foreign matter stuck in the grinding groove and can better meet the use requirements.

Description

Technical Field

[0001] The invention relates to the technical field of electric grinders, and in particular to a speed regulation and forward and reverse control circuit of an electric grinder and a control method thereof. Background Art

[0002] It is known that people often use powdered food ingredients or seasonings, such as coffee powder, pepper powder, black pepper powder, etc. In order to maintain the best flavor of the food ingredients, the raw materials are often ground before use, and grinders came into being. Currently, grinders on the market are divided into manual grinders and electric grinders, among which electric grinders are particularly popular among users.

[0003] At present, most electric grinders on the market use a single speed of high speed or low speed for grinding, and there is no corresponding speed regulation function selection. Because the grinder is mainly used to grind some condiments such as salt and pepper, the grinding head and grinding speed determine the coarseness of the finished product. Therefore, there is also an electric grinder, an electric grinder speed regulation circuit and a control method thereof disclosed in the Chinese invention patent with the authorization announcement number CN116599391B. By setting an induction switch S2 in the control circuit, the electric grinder can only be used when the body is inverted, which is convenient for user operation. At the same time, a gear switching switch S1 is set in the control circuit, so that the electric grinder has two gears of high speed / low speed. Although different speeds can be achieved for grinding, most of the existing ones use stepless speed regulation, which cannot meet the precise and stable use requirements, and the existing ones cannot realize the control of forward and reverse rotation. When there is a foreign object stuck in the grinding mechanism during the grinding process, the event will often occur. The common method is to pry open the equipment and manually remove the foreign object, which not only needs to destroy the grinder structure and affect the appearance, but also is very time-consuming and laborious. In view of the above defects, it is necessary to make improvements to the existing technology. Summary of the invention

[0004] 1. Technical issues that need to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a speed regulation, forward and reverse control circuit and control method of an electric grinder, which can achieve stepless speed regulation, and can operate more accurately and smoothly. Moreover, without increasing any component costs, it can automatically reverse, which is conducive to removing foreign objects stuck in the grinding groove, prolonging the service life, and better meeting the user's usage needs.

[0006] (II) Technical solutions that need to be adopted

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A speed regulation and forward and reverse control circuit for an electric grinder comprises a power supply circuit, a drive circuit and a control circuit, wherein the control circuit is respectively connected to the power supply circuit and the drive circuit, the power supply circuit comprises a charging circuit, a power supply circuit and a power supply protection circuit, the power supply protection circuit is used to protect the power supply circuit, the charging circuit and the power supply protection circuit are respectively connected to the control circuit, the control circuit comprises a main control circuit and an inversion sensor, the main control circuit is respectively connected to the inversion sensor, the charging circuit, the power supply protection circuit and the drive circuit, and the drive circuit is connected to a motor.

[0009] Preferably, the power circuit is connected to a power source, and the power source is a lithium battery.

[0010] Preferably, the charging circuit includes a first integrated chip U1 and a charging interface J1, one end of the charging interface J1 is connected to a first resistor R1 and a first capacitor C1, the first resistor R1 and the first capacitor C1 are both grounded, the other end of the charging interface J1 is connected to the fourth pin of the first integrated chip U1, the eighth pin of the first integrated chip U1 is connected to a sixteenth resistor R16, the second pin of the first integrated chip U1 is connected to a second resistor R2, the second resistor R2 is grounded, the fifth pin of the first integrated chip U1 is connected to a second capacitor C2, the second capacitor C2 is connected to the power supply circuit, and the power supply circuit is connected to a power supply.

[0011] Preferably, the power protection circuit includes a third integrated chip U3 and a fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to the first pin of the fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to a thirteenth resistor R13, one end of the thirteenth resistor R13 is connected to the power supply, the other end of the thirteenth resistor R13 is connected to a sixth capacitor C6, the power supply and the sixth capacitor C6, and the sixth capacitor C6 is connected to the power supply.

[0012] Preferably, the main control circuit includes a second integrated chip U2 and a battery socket J2, the first pin of the second integrated chip U2 is connected to a power supply and a fifth capacitor C5, the fifth capacitor C5 is grounded, the second pin of the second integrated chip U2 is connected to a third resistor R3, the third resistor R3 is connected to the first pin of the battery socket J2, the battery socket J2 is connected to a lamp holder, a lighting lamp is installed on the lighting lamp holder, the second pin of the battery socket J2 is connected to a power supply, the power supply supplies power to the lighting lamp, and the third pin of the second integrated chip U2 is connected to the power supply of the power supply. The first pin of the second integrated chip U2 is connected to the forward and reverse position switch, the fifth pin of the second integrated chip U2 is connected to the transistor Q1 and the transistor Q3, the third pin of the transistor Q1 is connected to the third pin of the transistor Q3 and then connected to the motor base J3, the second pin of the transistor Q1 is connected to the power supply, the sixth pin of the second integrated chip U2 is connected to the transistor Q2 and the transistor Q4, the second pin of the transistor Q2 is connected to the power supply, the second pin of the transistor Q3 is connected to the second pin of the transistor Q2, and the second pin of the transistor Q3 is connected to the second pin of the transistor Q2 The second pin is connected to the twelfth resistor R12, the sixth pin of the second integrated chip U2 is respectively connected to the first pin of the transistor 2 Q2 and the first pin of the transistor 4 Q4, the first pin and the second pin of the motor seat J3 are connected to the ninth capacitor C9 for protecting the motor, the ninth pin of the second integrated chip U2 is connected to the charging circuit through the seventh resistor R7, the tenth pin of the second integrated chip U2 is connected to the twelfth resistor R12 through the tenth resistor R17, the eleventh pin of the second integrated chip U2 is connected to the third lamp LED3 through the sixth resistor R6, and the third lamp LED3 is connected to a power supply, the twelfth pin of the second integrated chip U2 is connected to the first lamp LED1 and the second lamp LED2, the twelfth pin of the second integrated chip U2 is connected to the charging circuit through the eighth resistor R8, the thirteenth pin of the second integrated chip U2 is connected to the fourth resistor R4 and the fifth resistor R5, the fourth resistor R4 is connected to the first lamp LED1, the fifth resistor R5 is connected to the second lamp LED2, and the fourteenth pin of the second integrated chip U2 is used for grounding.

[0013] In addition, the present invention also provides a speed regulation and forward and reverse control circuit for an electric grinder, comprising the following steps:

[0014] S1, installing the speed regulation and forward and reverse control circuit of the electric grinder in the electric grinder, and installing a button for connecting the speed regulation and forward and reverse control circuit of the electric grinder on the electric grinder;

[0015] S2. By clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward, and the motor will make the electric grinder start working. At this time, the second light LED2 in the main control circuit is always blue. Press the button again, and the main control circuit drives the motor to reverse through the circuit drive. Or, after clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward. After the motor starts, long press the button again to switch the working gear between fast and slow gears. In the slow gear indicator, the first light LED1 is always green.

[0016] (III) Technical effects to be achieved

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the power supply circuit of the present invention includes a charging circuit, a power supply circuit and a power supply protection circuit. The power supply protection circuit is used to protect the power supply circuit. The charging circuit and the power supply protection circuit are respectively connected to the control circuit. The control circuit includes a main control circuit and an inversion sensor. The main control circuit is respectively connected to the inversion sensor, the charging circuit, the power supply protection circuit and the drive circuit. The drive circuit is connected to a motor, which can achieve stepless speed regulation, and can operate more accurately and smoothly. It can automatically reverse when used without increasing any component costs, which is conducive to removing foreign objects stuck in the grinding groove, improving the service life, and is more conducive to meeting the user's usage needs.

[0019] Secondly, the operation of the present invention is extremely simple and convenient, which is conducive to achieving speed regulation and controlling forward and reverse rotation, and is more conducive to meeting the usage needs of modern users. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of a speed regulation and forward and reverse control circuit block for an electric grinder.

[0021] Figure 2 The present invention is a schematic diagram of the block structure of a speed regulation and forward and reverse control circuit of an electric grinder.

[0022] Figure 3 The present invention is a schematic diagram of a charging circuit in a speed regulation and forward and reverse control circuit of an electric grinder.

[0023] Figure 4 The present invention is a schematic diagram of a main control circuit in a speed regulation and forward and reverse control circuit of an electric grinder.

[0024] Figure 5 The present invention is a schematic diagram of a power supply protection circuit in a speed regulation and forward and reverse control circuit of an electric grinder.

[0025] Figure 6The present invention is a schematic diagram of a triode circuit of a main control circuit in a speed regulation and forward and reverse control circuit of an electric grinder. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0027] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0030] Example 1: See Figure 1A speed regulation and forward and reverse control circuit for an electric grinder includes a power supply circuit, a drive circuit and a control circuit. The control circuit is connected to the power supply circuit and the drive circuit respectively. Figure 2 As shown, the power supply circuit includes a charging circuit, a power supply circuit and a power supply protection circuit. The power supply protection circuit is used to protect the power supply circuit. The charging circuit and the power supply protection circuit are respectively connected to the control circuit. The control circuit includes a main control circuit and an inversion sensor. The main control circuit is respectively connected to the inversion sensor, the charging circuit, the power supply protection circuit and the drive circuit. The drive circuit is connected to the motor. This arrangement is reasonable. The main control circuit is conducive to realizing speed control of the drive circuit, which is conducive to realizing speed control of the motor by the drive circuit. The combination of the main control circuit and the inversion sensor is conducive to realizing forward and reverse control of the motor through the drive circuit, which is more conducive to meeting usage requirements.

[0031] Embodiment 2: It can be explained on the basis of embodiment 1 that the power circuit is connected to a power source, and the power source adopts a lithium battery, which is conducive to charging and convenient to use.

[0032] Embodiment 3: It can be described on the basis of Embodiment 1 or Embodiment 2, such as Figure 3 As shown, the charging circuit includes a first integrated chip U1 and a charging interface J1, one end of the charging interface J1 is connected to a first resistor R1 and a first capacitor C1, both of which are grounded, and the other end of the charging interface J1 is connected to the fourth pin of the first integrated chip U1, the eighth pin of the first integrated chip U1 is connected to a sixteenth resistor R16, the second pin of the first integrated chip U1 is connected to a second resistor R2, the second resistor R2 is grounded, the fifth pin of the first integrated chip U1 is connected to a second capacitor C2, the second capacitor C2 is connected to a power circuit, the power circuit is connected to a power source, the power source is a battery, and the battery is preferably a lithium battery, and filtering is facilitated by the second capacitor C2, which is conducive to better charging. Further explanation, as Figure 5 As shown, the power protection circuit includes a third integrated chip U3 and a fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to the first pin of the fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to the thirteenth resistor R13, one end of the thirteenth resistor R13 is connected to the power supply (power supply +, positive pole of power supply, which is conducive to power supply), the other end of the thirteenth resistor R13 is connected to the sixth capacitor C6, the power supply and the sixth capacitor C6, the sixth capacitor C6 is connected to the power supply (power supply -, negative pole of power supply), which is conducive to filtering, and the power supply is connected to the fourth relay J4.

[0033] Embodiment 4: It can be described on the basis of Embodiment 1, Embodiment 2 or Embodiment 3, such as Figure 4 and Figure 6As shown, the main control circuit includes a second integrated chip U2 and a battery socket J2. The first pin of the second integrated chip U2 is connected to a power supply (power supply +, the positive pole of the power supply) and a fifth capacitor C5. The fifth capacitor C5 is grounded, which is conducive to filtering. The second pin of the second integrated chip U2 is connected to a third resistor R3. The third resistor R3 is connected to the first pin of the battery socket J2. The battery socket J2 is connected to a lamp holder. A lighting lamp is installed on the lamp holder. The second pin of the battery socket J2 is connected to a power supply (power supply +, the positive pole of the power supply). The power supply supplies power to the lighting lamp. The third pin of the second integrated chip U2 is connected to a forward and reverse position switch (also called a forward and reverse switch or a forward and reverse switch). The fifth pin of the second integrated chip U2 is connected to a three-pole The first transistor Q1 (the first pin of the transistor Q1) and the third transistor Q3 (the first pin of the transistor Q3), the third pin of the transistor Q1 and the third pin of the transistor Q3 are connected and then connected to the motor base J3 (the second pin of the motor base), the second pin of the transistor Q1 is connected to the power supply (power supply +, positive power supply), the six pins of the second integrated chip U2 are connected to the transistor Q2 (the first pin of the transistor Q2) and the transistor Q4 (the first pin of the transistor Q4), the second pin of the transistor Q2 is connected to the power supply (power supply +, positive power supply), the second pin of the transistor Q3 is connected to the second pin of the transistor Q2, and the second pin of the transistor Q3 and the second pin of the transistor Q2 are connected to the twelfth resistor R1 2 (used for detection), the sixth pin of the second integrated chip U2 is connected to the first pin of the transistor Q2 and the first pin of the transistor Q4 respectively, the first pin and the second pin of the motor seat J3 are connected to the ninth capacitor C9 for protecting the motor, the ninth pin of the second integrated chip U2 is connected to the charging circuit (the sixth pin of the first integrated chip U1 in the charging circuit) through the seventh resistor R7, the tenth pin of the second integrated chip U2 is connected to the twelfth resistor R12 (used for sampling) through the tenth resistor R17, the eleventh pin of the second integrated chip U2 is connected to the third lamp LED3 (the negative electrode of the third lamp LED3) through the sixth resistor R6, and the third lamp LED3 (the positive electrode of the third lamp LED3) is connected to the capacitor C9. Source (power supply +, positive power supply), the twelfth pin of the second integrated chip U2 is connected to the first lamp LED1 (the positive pole of the first lamp LED1) and the second lamp LED2 (the negative pole of the second lamp LED2), the twelfth pin of the second integrated chip U2 is connected to the charging circuit (the fourth pin of the first integrated chip U1 in the charging circuit) through the eighth resistor R8, the thirteenth pin of the second integrated chip U2 is connected to the fourth resistor R4 and the fifth resistor R5, the fourth resistor R4 is connected to the first lamp LED1 (the negative pole of the first lamp LED1), the fifth resistor R5 is connected to the second lamp LED2 (the positive pole of the second lamp LED2), and the fourteenth pin of the second integrated chip U2 is used for grounding.

[0034] To further explain, when the third light LED3 is red and on, it indicates charging status, and when the second light LED2 is blue and always on, when the power circuit is connected to a power source and the power source is a lithium battery, the power source is fully charged, and when the third light LED3 is off, the power charging process is completed.

[0035] Embodiment 4: Based on the description of Embodiment 1, Embodiment 2 or Embodiment 3, a method for controlling the speed regulation and forward and reverse circuit of an electric grinder is provided, which is characterized in that it comprises the following steps:

[0036] S1, installing the speed regulation and forward and reverse control circuit of the electric grinder in the electric grinder, and installing a button for connecting the speed regulation and forward and reverse control circuit of the electric grinder on the electric grinder;

[0037] S2. By clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward, and the motor will make the electric grinder start working. At this time, the second light LED2 (fast gear) in the main control circuit is always blue. Press the button again, and the main control circuit drives the motor to reverse through the circuit. Or, after clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward. After the motor starts, long press the button again to switch the working gear between fast and slow gears. When the slow gear indicator is the first light LED1 (slow gear) is always green.

[0038] The electric grinder of the present invention has the following two ways to reverse the motor:

[0039] The first one is that after the power switch (button) in the electric grinder is turned on, the time for the motor to reverse can be preset in the main control circuit. In this embodiment, the motor reverses for 1.5 seconds, which is conducive to removing the unground materials in the grinding groove of the electric grinder and preparing for normal grinding next time. It is also possible that after the power switch (button) in the electric grinder is turned on, when the electric grinder is placed upside down (it is easy to flip the electric grinder to a certain angle), after the inversion sensor is started, the main control circuit in the control circuit (the third pin of the second integrated chip U2 becomes a high level) will make the motor standby after reversing, indicating that the electric grinder is in and out of the standby state. When it is used next time, it only needs to reverse the electric grinder to enter the working state. Among them, after clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward. After the motor starts, the button is pressed for 2 seconds again to switch the working gear between the fast and slow gears.

[0040] Second, the present invention can realize the motor reversal by detecting the current or voltage in the electric grinder. Specifically, when the power protection circuit in the power supply circuit or the main control circuit in the control circuit detects a current or voltage value greater than the preset value (when the main control circuit in the control circuit (10PIN in the second integrated chip U2) detects a voltage greater than the set threshold value), the control circuit will drive the motor to reverse through the drive circuit, which is conducive to the removal of foreign matter from the electric grinder, and then the motor rotates forward. After repeated operation for 3 times, the voltage detected by the main control circuit (10PIN in the second integrated chip U2) still cannot drop to the normal value, and it is judged that the current grinding object is a foreign object and stops. At this time, the user is prompted to open the storage container in the electric grinder to take out the foreign object. Preferably, when the motor suddenly stops after the power protection circuit (lithium battery) is protected due to a fast and large current, the material to be ground is stuck in the grinding groove because the power is cut off and there is no time to reverse, and the motor is stuck. After the main control circuit (second integrated chip U2) detects this situation, it will reverse the motor first when the user turns on the machine and then enter the normal grinding program, which effectively solves the problem of similar equipment on the current market being necrotic.

[0041] The present invention can adopt a variety of ways to reverse the electric grinder, which is conducive to timely cleaning out the grinding tank and can better meet the use requirements.

[0042] The present invention can charge the charging circuit through the electric grinder using a data cable. During the charging process, the third light LED3 is red and lights up to indicate a charging state, the second light LED2 is blue and always on, and when the power circuit is connected to a power source, the power source uses a lithium battery, and the power source is fully charged, and when the third light LED3 is off, the power charging process is completed.

[0043] The first light emitting lamp LED1 of the present invention can be operated more accurately and stably through stepless speed regulation, and without increasing any component cost, the motor current is monitored in real time during the operation of the motor, which can effectively protect the motor and the equipment from damage due to overcurrent. In particular, during the grinding process of the electric grinder, foreign objects often get stuck in the grinding mechanism. The common method is to pry open the equipment and manually remove the foreign objects, which not only needs to destroy the grinder structure and affect the appearance, but is also time-consuming and laborious. The present invention does not need to increase any component cost. When the motor is detected to be stuck, it will automatically reverse when it is turned on next time to remove the foreign objects stuck in the grinding groove of the electric grinder, solving the problems often encountered in the use of the electric grinder, and effectively ensuring the integrity and practicality of the equipment.

[0044] The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature bolts and rivets in the existing technology. The internal components of the inverted sensor and the motor all adopt conventional models in the existing technology, and their internal structures belong to the existing technology structure. Workers can complete normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the existing technology, and no specific description is given here.

[0045] It should be noted that although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments of this article, or equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A speed regulation and forward and reverse control circuit for an electric grinder, comprising a power supply circuit, a drive circuit and a control circuit, wherein the control circuit is connected to the power supply circuit and the drive circuit respectively, and is characterized in that: The power supply circuit includes a charging circuit, a power supply circuit and a power supply protection circuit. The power supply protection circuit is used to protect the power supply circuit. The charging circuit and the power supply protection circuit are respectively connected to the control circuit. The control circuit includes a main control circuit and an inversion sensor. The main control circuit is respectively connected to the inversion sensor, the charging circuit, the power supply protection circuit and the drive circuit. The drive circuit is connected to a motor.

2. The speed regulation and forward and reverse control circuit of the electric grinder according to claim 1, characterized in that: The power circuit is connected to a power source, and the power source is a lithium battery.

3. The speed regulation and forward and reverse control circuit of the electric grinder according to claim 1 or 2, characterized in that: The charging circuit includes a first integrated chip U1 and a charging interface J1, one end of the charging interface J1 is connected to a first resistor R1 and a first capacitor C1, the first resistor R1 and the first capacitor C1 are both grounded, the other end of the charging interface J1 is connected to the fourth pin of the first integrated chip U1, the eighth pin of the first integrated chip U1 is connected to a sixteenth resistor R16, the second pin of the first integrated chip U1 is connected to a second resistor R2, the second resistor R2 is grounded, the fifth pin of the first integrated chip U1 is connected to a second capacitor C2, the second capacitor C2 is connected to the power supply circuit, and the power supply circuit is connected to a power supply.

4. The speed regulation and forward and reverse control circuit of the electric grinder as claimed in claim 3, characterized in that: The power protection circuit includes a third integrated chip U3 and a fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to the first pin of the fourth integrated chip U4, the first pin of the third integrated chip U3 is connected to a thirteenth resistor R13, one end of the thirteenth resistor R13 is connected to the power supply, the other end of the thirteenth resistor R13 is connected to a sixth capacitor C6, the power supply and the sixth capacitor C6, and the sixth capacitor C6 is connected to the power supply.

5. The speed regulation and forward and reverse control circuit of the electric grinder as claimed in claim 1, 2 or 4, characterized in that: The main control circuit includes a second integrated chip U2 and a battery socket J2, wherein a first pin of the second integrated chip U2 is connected to a power supply and a fifth capacitor C5, wherein the fifth capacitor C5 is grounded, a second pin of the second integrated chip U2 is connected to a third resistor R3, wherein the third resistor R3 is connected to a first pin of the battery socket J2, wherein the battery socket J2 is connected to a lamp holder, wherein a lighting lamp is mounted on the lamp holder, a second pin of the battery socket J2 is connected to a power supply, wherein the power supply supplies power to the lighting lamp, and a third pin of the second integrated chip U2 is connected to The forward and reverse position switch, the fifth pin of the second integrated chip U2 is connected to the transistor Q1 and the transistor Q3, the third pin of the transistor Q1 is connected to the third pin of the transistor Q3 and then connected to the motor base J3, the second pin of the transistor Q1 is connected to the power supply, the sixth pin of the second integrated chip U2 is connected to the transistor Q2 and the transistor Q4, the second pin of the transistor Q2 is connected to the power supply, the second pin of the transistor Q3 is connected to the second pin of the transistor Q2, and the second pin of the transistor Q3 is connected to the second pin of the transistor Q2 The first and second pins of the motor base J3 are connected to the ninth capacitor C9 for protecting the motor. The ninth pin of the second integrated chip U2 is connected to the charging circuit through the seventh resistor R7. The tenth pin of the second integrated chip U2 is connected to the twelfth resistor R12 through the tenth resistor R17. The eleventh pin of the second integrated chip U2 is connected to the third lamp LED3 through the sixth resistor R6. The third lamp LED3 is connected to a power supply. The twelfth pin of the second integrated chip U2 is connected to the first lamp LED1 and the second lamp LED2. The twelfth pin of the second integrated chip U2 is connected to the charging circuit through the eighth resistor R8. The thirteenth pin of the second integrated chip U2 is connected to the fourth resistor R4 and the fifth resistor R5. The fourth resistor R4 is connected to the first lamp LED1, and the fifth resistor R5 is connected to the second lamp LED2. The fourteenth pin of the second integrated chip U2 is used for grounding.

6. A method for controlling the speed regulation and forward and reverse circuit of an electric grinder, characterized in that: The steps include: S1. The speed regulating and forward and reverse control circuit of the electric grinder according to any one of claims 1 to 5 is installed in the electric grinder, and a button for connecting the speed regulating and forward and reverse control circuit of the electric grinder is installed on the electric grinder; S2. By clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward, and the motor will make the electric grinder start working. At this time, the second light LED2 in the main control circuit is always blue. Press the button again, and the main control circuit drives the motor to reverse through the circuit drive. Or, after clicking the button, the main control circuit is started, so that the drive circuit drives the motor to rotate forward. After the motor starts, long press the button again to switch the working gear between fast and slow gears. In the slow gear indicator, the first light LED1 is always green.

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