Grinding reset switch circuit and coffee bean grinder

Abstract

The utility model provides a grinding reset switch circuit and a coffee bean grinder, the circuit comprises a microcontroller, a limit switch circuit, an optocoupler detection circuit, a bean grinding drive circuit and a reset circuit, and the optocoupler detection circuit is used for reading a bean grinding inner cutter position sensing signal and comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor and an optocoupler switch tube. The bean grinding drive circuit comprises a forward bean grinding drive circuit and a reverse bean grinding drive circuit, after beans are ground for a period of time according to the current grinding fineness, the bean grinding drive circuit drives a bean grinding inner cutter of a bean grinding motor shaft to rotate spirally so that the bean grinding inner cutter can block the optocoupler switch, an optocoupler switch tube is switched off after the optocoupler detection circuit receives a detection signal, and the optocoupler switch tube is switched off; in this way, when a user adjusts the grinding fineness next time, the set grinding fineness is matched with the gap between the corresponding bean grinding inner cutter and the corresponding bean grinding outer cutter, and therefore the gap error existing between the bean grinding inner cutter and the bean grinding outer cutter is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of coffee machines, in particular to a grinding reset switch circuit and coffee bean grinder. BACKGROUND

[0002] In the grinding process of the coffee machine, the inner and outer knives are designed to control the fineness of the coffee bean powder by adjusting the gap distance between them. Among them, the outer knife is fixed on the inner wall of the coffee machine, and the inner knife is adjusted by the user to adjust the current height, and then adjust the gap distance between the inner and outer knives, so as to adjust the fineness of the coffee bean powder.

[0003] However, after the coffee machine performs the grinding operation for many times, since the inner knife is adjusted by the user to adjust its height, there is a certain deviation between the actual position of the inner knife and its initial position, so that the gap between the inner and outer knives is no longer constant, which causes the fineness of the ground coffee powder to be different from the set grinding fineness when the user places the coffee beans, and even part of the coffee beans directly passes through the gap during grinding without being effectively ground, which causes the coffee beans to be insufficiently ground, so that the ground coffee beans have obvious particles or broken particles, which will affect the taste and brewing effect of the coffee in the subsequent brewing step. CONTENT OF THE INVENTION

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art, and to provide a grinding reset switch circuit and coffee bean grinder which reduces the gap error between the inner and outer knives by resetting the inner knife.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] The application discloses a kind of grinding reset switch circuits, including microcontroller, limit switch circuit, optocoupler detection circuit, bean grinding drive circuit and reset circuit;The limit switch circuit is electrically connected with the reset control end of the microcontroller;The optocoupler detection circuit is used to read the inside knife position sensing signal of bean grinding, and the optocoupler detection circuit includes second resistance, third resistance, fourth resistance, fifth resistance and optocoupler switch tube, the second end of the optocoupler switch tube and the fourth end of the optocoupler switch tube are used to ground, the first end of the optocoupler switch tube is connected with the first end of the second resistance, the third end of the optocoupler switch tube is connected with the first end of the third resistance and the first end of the fourth resistance, the second end of the second resistance is respectively connected with the second end of the third resistance, the second end of the fourth resistance and the second end of the fifth resistance, the second end of the fourth resistance is connected with reference power supply, the first end of the fourth resistance is connected with the detection input end of the microcontroller, the second end of the fifth resistance is connected with the detection output end of the microcontroller, and the second end of the fifth resistance is also used to ground;The bean grinding drive circuit includes forward bean grinding drive circuit and reverse bean grinding drive circuit, the mode number drive end of the microcontroller is respectively connected with the input end of the forward bean grinding drive circuit and the input end of the reverse bean grinding drive circuit, the positive rotation signal enable end of the forward bean grinding drive circuit is connected with the drive one end of the microcontroller, and the reverse rotation signal enable end of the reverse bean grinding drive circuit is connected with the drive two end of the microcontroller;The output end of the forward bean grinding drive circuit is used to connect the positive end of bean grinding motor, and the output end of the reverse bean grinding drive circuit is used to connect the negative end of bean grinding motor.

[0007] In one embodiment, the bean grinding drive circuit further includes a sixth resistor, the first end of the sixth resistor is connected with the mode number drive end of the microcontroller, and the second end of the sixth resistor is respectively connected with the controlled end of the forward bean grinding drive circuit and the controlled end of the reverse bean grinding drive circuit.

[0008] In one embodiment, the bean grinding drive circuit further includes a seventh resistor, the first end of the seventh resistor is connected with the input end of the reverse bean grinding drive circuit, and the second end of the seventh resistor is connected with ground.

[0009] In one embodiment, the bean grinding drive circuit further includes a second capacitor, the upper half end of the second capacitor is connected with the first end of the sixth resistor, and the lower half end of the second capacitor is connected with ground.

[0010] In one of the embodiments, the forward bean grinding driving circuit comprises an eighth resistor, a first switch tube and a first relay switch, a first end of the eighth resistor is connected to a driving end of the microcontroller, a second end of the eighth resistor is connected to a control end of the first switch tube, a first end of the first relay switch and a third end of the first relay switch are connected to a high-voltage power supply, a second end of the first relay switch is connected to a second end of the sixth resistor, a fourth end of the first relay switch is connected to a first end of the first switch tube, a second end of the first switch tube is connected to ground, and a fifth end of the first relay switch is connected to a positive end of the bean grinding motor.

[0011] In one of the embodiments, the forward bean grinding driving circuit further comprises a first protection tube, a positive electrode of the first protection tube is connected to a first end of the first switch tube, and a negative electrode of the first protection tube is connected to a third end of the first relay switch.

[0012] In one of the embodiments, the reverse bean grinding driving circuit comprises a ninth resistor, a second switch tube and a second relay switch, a first end of the ninth resistor is connected to a driving two end of the microcontroller, a second end of the ninth resistor is connected to a control end of the second switch tube, a first end of the second relay switch and a third end of the second relay switch are connected to a high-voltage power supply, a second end of the second relay switch is connected to a second end of the sixth resistor, a fourth end of the second relay switch is connected to a first end of the second switch tube, a second end of the second switch tube is connected to ground, and a fifth end of the second relay switch is connected to a negative end of the bean grinding motor.

[0013] In one of the embodiments, the reverse bean grinding driving circuit further comprises a second protection tube, a positive electrode of the second protection tube is connected to a first end of the second switch tube, and a negative electrode of the second protection tube is connected to a third end of the second relay switch.

[0014] In one of the embodiments, a limit switch circuit is further included, and the limit switch circuit is electrically connected to a reset control end of the microcontroller. 。

[0015] A coffee bean grinder comprises the grinding reset switch circuit according to any one of the above embodiments.

[0016] Compared with the prior art, the present disclosure has at least the following advantages:

[0017] The user adjusts the coffee bean grinding fineness through the coffee bean grinder, specifically, adjusts the gap between the inner knife and the outer knife of the grinder, after grinding coffee beans with the fineness corresponding to the gap for a period of time, the inner knife of the grinder is offset by a distance, so that the current gap is inconsistent with the originally adjusted gap, the grinding reset switch circuit is used for detecting the position state of the inner knife of the grinder through the optocoupler detection circuit, and then performing a reset action on the inner knife of the grinder, specifically, after grinding coffee beans with the current grinding fineness for a period of time, the grinder driving circuit drives the inner knife of the grinder motor shaft to rotate, so that the inner knife of the grinder blocks the optocoupler switch, and the optocoupler switch tube is disconnected after the optocoupler detection circuit receives the detection signal, so that the reset function is achieved, in this way, when the user adjusts the grinding fineness next time, the set grinding fineness matches the gap between the inner knife and the outer knife, thereby reducing the gap error between the inner knife and the outer knife. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 It is a schematic diagram of the grinding reset switch circuit in an embodiment;

[0020] Figure 2 It is a partial circuit diagram of the grinding reset switch circuit in an embodiment;

[0021] Figure 3 It is a partial circuit diagram of the grinding reset switch circuit in an embodiment; Figure 1 It is another partial circuit diagram of the grinding reset switch circuit.

[0022] Mark: 10, grinding reset switch circuit; 100, microcontroller; 200, limit switch circuit; 300, optocoupler detection circuit; 400, grinder driving circuit; 410, forward grinder driving circuit; 420, reverse grinder driving circuit; 500, reset circuit; R7, first resistor; R16, second resistor; R17, third resistor; R8, fourth resistor; R9, fifth resistor; R10, sixth resistor; R15, seventh resistor;

[0023] R11, eighth resistor; R13, ninth resistor; C15, first capacitor; C18, second capacitor; U2, optocoupler switch tube; Q1, first switch tube; Q2, second switch tube; K1, first relay switch; K2, second relay switch; D1, first protection tube; D2, second protection tube. DETAILED DESCRIPTION

[0024] For the purpose of clarity, the present disclosure will be described with reference to the accompanying drawings. The preferred embodiments of the present disclosure are illustrated in the drawings. However, the present disclosure can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.

[0025] It is noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not meant to be limiting.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] In order to make the technical scheme and beneficial effects of the present disclosure more comprehensible, the present disclosure will be further described in detail below in combination with specific embodiments:

[0028] Please refer to Figures 2-3It is the grinding reset switch circuit 10 of an embodiment of the utility model, including microcontroller 100, photoelectric coupling detection circuit 300 and bean grinding drive circuit 400, photoelectric coupling detection circuit 300 is used to read the inside knife position sensing signal of bean grinding, including second resistance R16, third resistance R17, fourth resistance R8, fifth resistance R9 and photoelectric coupling switch tube U2, the second end of photoelectric coupling switch tube U2 and the fourth end of photoelectric coupling switch tube U2 are all used to ground, the first end of photoelectric coupling switch tube U2 connects the first end of second resistance R16, the third end of photoelectric coupling switch tube U2 connects the first end of third resistance R17 and the first end of fourth resistance R8, the second end of second resistance R16 connects the second end of third resistance R17, the second end of fourth resistance R8 and the second end of fifth resistance R9 respectively, the second end of fourth resistance R8 connects reference power supply, the first end of fourth resistance R8 connects the detection input end of microcontroller, the detection output end of microcontroller connects the second end of fifth resistance R9, and the second end of fifth resistance R9 is also used to ground;Bean grinding drive circuit 400 is used to control the shaft end of bean grinding motor spiral rotation up and down, specifically, bean grinding drive circuit 400 is used to control the shaft end of bean grinding motor spiral rotation up or spiral rotation down, bean grinding drive circuit 400 includes forward bean grinding drive circuit 410 and reverse bean grinding drive circuit 420, the mode conversion number drive end of microcontroller 100 connects the input end of forward bean grinding drive circuit 410 and the input end of reverse bean grinding drive circuit 420 respectively, the positive rotation signal enable end of forward bean grinding drive circuit 410 connects the drive one end of microcontroller 100, the reverse rotation signal enable end of reverse bean grinding drive circuit 420 connects the drive two ends of microcontroller 100;The output end of forward bean grinding drive circuit 410 is used to connect the positive end of bean grinding motor, the output end of reverse bean grinding drive circuit 420 is used to connect the negative end of bean grinding motor, the shaft end of bean grinding motor is fixedly connected with the inside knife of bean grinding, so that reverse bean grinding drive circuit 420 controls the inside knife of bean grinding spiral rotation reversely, and forward bean grinding drive circuit 410 controls the inside knife of bean grinding spiral rotation forwardly.

[0029] In the embodiment, the user adjusts the coffee bean grinding fineness through the coffee bean grinder, specifically adjusts the gap between the inside knife and the outside knife of the bean grinder, when the coffee beans are ground for a period of time with the fineness corresponding to the gap, the inside knife of the bean grinder is offset by a certain distance, so that the current gap is inconsistent with the original adjusted gap, the grinding reset switch circuit detects the position state of the inside knife of the bean grinder through the photoelectric coupling detection circuit, and then resets the inside knife of the bean grinder, specifically, after the coffee beans are ground for a period of time with the current grinding fineness, the bean grinding drive circuit drives the inside knife of the bean grinder shaft to spiral rotate, so that the inside knife of the bean grinder blocks the photoelectric coupling switch, the photoelectric coupling switch tube is disconnected after the photoelectric coupling detection circuit receives the detection signal, so that the reset function is achieved, in this way, when the user adjusts the grinding fineness next time, the set grinding fineness matches the gap between the inside knife and the outside knife of the bean grinder, so that the gap error between the inside knife and the outside knife of the bean grinder is reduced.

[0030] It can be understood that, in combination with Figures 1-3 As shown, the forward bean grinding drive circuit 410 is used to drive the bean grinding motor to rotate forward, and the reverse bean grinding drive circuit 420 is used to drive the bean grinding motor to rotate reversely. After the user sets the coffee bean grinding fineness and works for a period of time, the forward bean grinding drive circuit 410 can be started by the enable adjustment signal, thereby driving the bean grinding inner cutter arranged on the bean grinding motor shaft to rotate forward, or the reverse bean grinding drive circuit 420 can be started, thereby driving the bean grinding inner cutter arranged on the bean grinding motor shaft to rotate reversely. In the initial state, the optocoupler switch tube U2 is in the conducting state. When the bean grinding inner cutter rotates to a certain position, the optocoupler switch tube U2 is shielded, so that the optocoupler switch tube U2 is turned off, and the current signal of the reference power supply is transmitted to the microcontroller 100, so as to complete the reset of the bean grinding inner cutter, so that the bean grinding inner cutter returns to the initial position, and the grinding fineness set by the user in the next adjustment of the grinding fineness matches the gap between the corresponding bean grinding inner cutter and the outer cutter. Further, the gap error is the error between the gap between the bean grinding inner cutter and the outer cutter corresponding to the set grinding fineness and the actual gap between the bean grinding inner cutter and the outer cutter.

[0031] In another embodiment, when the bean grinding inner cutter arranged on the bean grinding motor shaft rotates forward, the bean grinding inner cutter moves towards the direction of the optocoupler switch tube until shielding the light-emitting end of the optocoupler switch tube, so as to trigger the reset function of the bean grinding inner cutter. At this time, the bean grinding inner cutter arranged on the bean grinding motor shaft is driven to rotate reversely, and the bean grinding inner cutter moves away from the direction of the optocoupler switch tube, so as to realize the reset of the bean grinding inner cutter.

[0032] In another embodiment, when the bean grinding inner cutter arranged on the bean grinding motor shaft rotates reversely, the bean grinding inner cutter moves towards the direction of the optocoupler switch tube. After the reset is triggered, the bean grinding inner cutter arranged on the bean grinding motor shaft rotates forward, and the bean grinding inner cutter moves away from the direction of the optocoupler switch tube.

[0033] Further, the first end and the second end of the optocoupler switch tube U2 constitute an input light-emitting diode, the first end is the input positive electrode, and the second end is the input negative electrode. The third end and the fourth end of the optocoupler switch tube U2 constitute a photosensitive triode, the third end is the collector, and the fourth end is the emitter.

[0034] In one of the embodiments, the bean grinding drive circuit 10 further comprises a sixth resistor R10, the first end of the sixth resistor R10 is connected to the analog-to-digital conversion number driving end of the microcontroller 100, and the second end of the sixth resistor R10 is respectively connected to the controlled end of the forward bean grinding drive circuit 410 and the controlled end of the reverse bean grinding drive circuit 420. The sixth resistor R10 is used to limit the current of the analog-to-digital conversion number driving signal, so as to prevent overcurrent from damaging the elements in the bean grinding drive circuit 400. Further, the sixth resistor R10 is a shunt resistor.

[0035] like Figure 3 As shown, in one embodiment, the grinder drive circuit 400 further includes a seventh resistor R15. The first end of the seventh resistor R15 is connected to the input terminal of the reverse grinder drive circuit 420, and the second end of the seventh resistor R15 is grounded. In this embodiment, when the inner blade of the grinder is reset, the reset digital signal will be grounded through the sixth resistor R10 and the seventh resistor R15, forming a loop. The seventh resistor R15 is used to divide the analog-to-digital drive voltage to prevent overvoltage damage to the components in the grinder drive circuit 400. Further, the seventh resistor R15 is a voltage divider resistor.

[0036] like Figure 3 As shown, in one embodiment, the grinding drive circuit 400 further includes a second capacitor C18. The upper half of the second capacitor C18 is connected to the first terminal of the sixth resistor R10, and the lower half of the second capacitor C18 is grounded. When a reset digital signal passes through the grinding drive circuit 400, the second capacitor C18 is used to filter the reset digital signal to prevent voltage fluctuations caused by interference from external signals and ensure normal operation of the grinding reset.

[0037] like Figure 3 As shown, in one embodiment, the forward grinding drive circuit 410 includes an eighth resistor R11, a first switching transistor Q1, and a first relay switch K1. The first end of the eighth resistor R11 is connected to the driving end of the microcontroller 100, the second end of the eighth resistor R11 is connected to the control end of the first switching transistor Q1, the first end and the third end of the first relay switch K1 are both used to connect to a high-voltage power supply of 24V, the second end of the first relay switch K1 is connected to the second end of the sixth resistor R10, the fourth end of the first relay switch K1 is connected to the first end of the first switching transistor Q1, the second end of the first switching transistor Q1 is grounded, and the fifth end of the first relay switch K1 is connected to the positive end of the grinding motor. It is understandable that when the coffee grinder is powered on, to adjust the grinding fineness by rotating the inner blades in the forward direction, this can be done via a button. The microcontroller 100 enables the forward adjustment signal, causing the control terminal of the first switching transistor Q1 to be in a high-level state. Consequently, the first switching transistor Q1 is in a conducting state, causing the first relay switch K1 to be in an open state. This enables the grinding motor to operate, and the inner blades move downwards through the shaft end of the grinding motor. At this time, the forward grinding drive circuit 410 is in a high-level state, and the reverse grinding drive circuit 420 is in a low-level state. Furthermore, the first switching transistor Q1 is an NPN transistor, with its first terminal being the collector, its second terminal being the emitter, and its control terminal being the base.

[0038] like Figure 3As shown in one of the embodiments, the forward bean grinding driving circuit 410 further comprises a first protection diode D1, a positive electrode of the first protection diode D1 is connected to a first end of the first switch tube Q1, and a negative electrode of the first protection diode D1 is connected to a third end of the first relay switch K1. When an overcurrent phenomenon occurs in the forward bean grinding driving circuit 410, the first protection diode D1 is used to prevent the overcurrent from breaking the first end of the first switch tube Q1, thereby protecting the first switch tube Q1 from failure of the level switch function. Further, the first protection diode D1 is a diode.

[0039] As shown in one of the embodiments, the forward bean grinding driving circuit 410 further comprises a first protection diode D1, a positive electrode of the first protection diode D1 is connected to a first end of the first switch tube Q1, and a negative electrode of the first protection diode D1 is connected to a third end of the first relay switch K1. When an overcurrent phenomenon occurs in the forward bean grinding driving circuit 410, the first protection diode D1 is used to prevent the overcurrent from breaking the first end of the first switch tube Q1, thereby protecting the first switch tube Q1 from failure of the level switch function. Further, the first protection diode D1 is a diode. Figure 3 As shown in one of the embodiments, the reverse bean grinding driving circuit 420 comprises a ninth resistor R13, a second switch tube Q2, and a second relay switch K2. A first end of the ninth resistor R13 is connected to a driving two-terminal of the microcontroller 100, a second end of the ninth resistor R13 is connected to a control end of the second switch tube Q2, a first end of the second relay switch K2 and a third end of the second relay switch K2 are both connected to a high-voltage power supply, a second end of the second relay switch K2 is connected to a second end of the sixth resistor R10, a fourth end of the second relay switch K2 is connected to a first end of the second switch tube Q2, a second end of the second switch tube Q2 is connected to the ground, and a fifth end of the second relay switch K2 is connected to a negative end of the bean grinding motor. It can be understood that when the coffee bean grinder is powered on, and the inner blade of the bean grinder is desired to be adjusted to rotate upward to adjust the grinding fineness, the adjustment can be made by pressing the button. The microcontroller 100 enables the control input signal to make the control end of the second switch tube Q2 in a high-level state, thereby making the second switch tube Q2 in a conduction state, making the second relay switch K2 in an open state, so that the bean grinding motor works, and the inner blade of the bean grinder moves upward through the shaft end of the bean grinding motor. At this time, the reverse bean grinding driving circuit 420 is in a high-level state, and the forward bean grinding driving circuit 410 is in a low-level state. Further, the second switch tube Q2 is an NPN type triode, a first end of which is a collector, a second end of which is an emitter, and a control end of which is a base.

[0040] It can be understood that the forward bean grinding driving circuit 410 is used to control the clockwise rotation of the bean grinding motor, and the reverse bean grinding driving circuit 420 is used to control the counterclockwise rotation of the bean grinding motor.

[0041] As shown in one of the embodiments, the reverse bean grinding driving circuit 420 further comprises a second protection diode D2, a positive electrode of the second protection diode D2 is connected to a first end of the second switch tube Q2, and a negative electrode of the second protection diode D2 is connected to a third end of the second relay switch K2. When an overcurrent phenomenon occurs in the reverse bean grinding driving circuit 420, the second protection diode D2 is used to prevent the overcurrent from breaking the first end of the second switch tube Q2, thereby protecting the second switch tube Q2 from failure of the level switch function. Further, the second protection diode D2 is a diode. Figure 3 It can be understood that the forward bean grinding driving circuit 410 is used to control the clockwise rotation of the bean grinding motor, and the reverse bean grinding driving circuit 420 is used to control the counterclockwise rotation of the bean grinding motor.

[0042] As Figure 2 shown, in one of the embodiments, a limit switch circuit 200 is further included, and the limit switch circuit 200 is electrically connected with the reset control end of the microcontroller 100. When the coffee bean grinder works for a period of time, the distance between the inner and outer knives of the grinder has an error with the distance between the inner and outer knives corresponding to the grinding fineness set by the user. At this time, the user only needs to click the limit switch S1 to perform the reset work of the inner grinder knife, that is, to drive the grinder motor to rotate to reset the inner grinder knife to the original position, that is, the distance between the inner and outer knives corresponding to the set grinding fineness, so that the operation is relatively simple.

[0043] In one of the embodiments, a reset circuit 500 is further included, and the reset circuit 500 includes a first resistor R7 and a first capacitor C15. The first end of the first resistor R7 is connected to the reference power supply, the second end of the first resistor R7 is respectively connected to the reset end of the microcontroller 100 and the upper half end of the first capacitor C15, and the lower half end of the first capacitor C15 is connected to the ground. When the microcontroller 100 appears abnormal, the operation system of the microcontroller is restarted through the action of system reset, so as to clear the abnormality occurred during the system operation, and prevent the working abnormality caused by long-time operation and long-time execution of instructions.

[0044] The present disclosure also provides a coffee bean grinder including the grinding reset switch circuit 10 in any of the above embodiments.

[0045] Compared with the prior art, the present disclosure has at least the following advantages:

[0046] The user adjusts the grinding fineness of the coffee beans through the coffee bean grinder, specifically adjusts the gap between the inner and outer knives of the grinder. When the coffee beans are ground with the fineness corresponding to the gap for a period of time, the inner grinder knife is offset by a certain distance, so that the current gap is inconsistent with the original adjusted gap. The grinding reset switch circuit described above is used for detecting the position state of the inner grinder knife through the optocoupler detection circuit, and then performs the reset action on the inner grinder knife. Specifically, after the coffee beans are ground for a period of time with the current grinding fineness, the grinder driving circuit drives the inner grinder knife of the grinder motor shaft to rotate, so that the inner grinder knife blocks the optocoupler switch. After the optocoupler detection circuit receives the detection signal, the optocoupler switch tube is disconnected, thereby achieving the reset function. In this way, when the user adjusts the grinding fineness next time, the set grinding fineness matches the gap between the inner and outer grinder knives, thereby reducing the error of the gap between the inner and outer grinder knives.

[0047] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the disclosed patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A grind back reset switch circuit, comprising: The application comprises: a microcontroller; a photocoupling detection circuit for reading the blade position sensing signal in the bean grinder, comprising a second resistor, a third resistor, a fourth resistor, a fifth resistor and a photocoupling switch tube, the second end of the photocoupling switch tube and the fourth end of the photocoupling switch tube are both connected to ground, the first end of the photocoupling switch tube is connected to the first end of the second resistor, the third end of the photocoupling switch tube is connected to the first end of the third resistor and the first end of the fourth resistor, the second end of the second resistor is respectively connected to the second end of the third resistor, the second end of the fourth resistor and the second end of the fifth resistor, the second end of the fourth resistor is connected to a reference power supply, the first end of the fourth resistor is connected to the detection input end of the microcontroller, the second end of the fifth resistor is connected to the detection output end of the microcontroller, and the second end of the fifth resistor is also connected to ground; a bean grinder driving circuit, comprising a forward bean grinder driving circuit and a reverse bean grinder driving circuit, the mode number driving end of the microcontroller is respectively connected to the input end of the forward bean grinder driving circuit and the input end of the reverse bean grinder driving circuit, the forward rotation signal enable end of the forward bean grinder driving circuit is connected to the driving one end of the microcontroller, and the reverse rotation signal enable end of the reverse bean grinder driving circuit is connected to the driving two end of the microcontroller; the output end of the forward bean grinder driving circuit is used for connecting the positive end of the bean grinder motor, and the output end of the reverse bean grinder driving circuit is used for connecting the negative end of the bean grinder motor.

2. The ground reset switch circuit of claim 1, wherein, The bean grinder driving circuit further comprises a sixth resistor, the first end of the sixth resistor is connected to the mode number driving end of the microcontroller, and the second end of the sixth resistor is respectively connected to the controlled end of the forward bean grinder driving circuit and the controlled end of the reverse bean grinder driving circuit.

3. The ground reset switch circuit of claim 1, wherein, The bean grinder driving circuit further comprises a seventh resistor, the first end of the seventh resistor is connected to the input end of the reverse bean grinder driving circuit, and the second end of the seventh resistor is connected to ground.

4. The grind reset switch circuit of claim 2, wherein, The bean grinder driving circuit further comprises a second capacitor, the upper half end of the second capacitor is connected to the first end of the sixth resistor, and the lower half end of the second capacitor is connected to ground.

5. The ground reset switch circuit of claim 2, wherein, The forward bean grinder driving circuit comprises an eighth resistor, a first switch tube and a first relay switch, the first end of the eighth resistor is connected to the driving one end of the microcontroller, the second end of the eighth resistor is connected to the control end of the first switch tube, the first end of the first relay switch and the third end of the first relay switch are both connected to a high-voltage power supply, the second end of the first relay switch is connected to the second end of the sixth resistor, the fourth end of the first relay switch is connected to the first end of the first switch tube, the second end of the first switch tube is connected to ground, and the fifth end of the first relay switch is connected to the positive end of the bean grinder motor.

6. The grind reset switch circuit of claim 5, wherein, The forward bean grinder driving circuit further comprises a first protection tube, the positive electrode of the first protection tube is connected to the first end of the first switch tube, and the negative electrode of the first protection tube is connected to the third end of the first relay switch.

7. The ground reset switch circuit of claim 2, wherein, The reverse bean grinding driving circuit comprises a ninth resistor, a second switch tube and a second relay switch, a first end of the ninth resistor is connected with a driving two-terminal of the microcontroller, a second end of the ninth resistor is connected with a control end of the second switch tube, a first end of the second relay switch and a third end of the second relay switch are both used for connecting with a high-voltage power supply, a second end of the second relay switch is connected with a second end of the sixth resistor, a fourth end of the second relay switch is connected with a first end of the second switch tube, a second end of the second switch tube is connected with the ground, a fifth end of the second relay switch is connected with a negative end of the bean grinding motor.

8. The grind reset switch circuit of claim 7, wherein, The reverse bean grinding driving circuit further comprises a second protection tube, a positive electrode of the second protection tube is connected with the first end of the second switch tube, and a negative electrode of the second protection tube is connected with the third end of the second relay switch.

9. The ground reset switch circuit of claim 1, wherein, Further comprising a limit switch circuit, the limit switch circuit is electrically connected with a reset control end of the microcontroller.

10. A coffee bean grinder characterized by, The grinding reset switch circuit comprises any one of claims 1-9.

Images