Extrusion molding mechanism control circuit of ice cream machine and ice cream machine

Abstract

The invention discloses an extrusion molding mechanism control circuit of an ice cream machine and the ice cream machine, and the control circuit comprises a rotating speed control module which is used for rectifying alternating current, supplying power to a direct current motor, and controlling the rotating speed of the direct current motor; the steering control module is used for controlling the steering of the direct current motor; the rotating speed detection module is used for detecting the rotating speed of the direct-current motor; the overcurrent protection module is used for disconnecting the starting power supply voltage of the steering control module when overcurrent of the direct current motor is detected; and the micro-control unit is used for outputting a rotating speed control signal to control the rotating speed of the direct-current motor, outputting a steering control signal to control the steering of the direct-current motor and adjusting the rotating speed of the direct-current motor according to the rotating speed signal. The working current of the direct current motor is detected, and when it is detected that the direct current motor is subjected to overcurrent due to overload and other factors, the overcurrent protection module can disconnect the starting power supply voltage of the steering control module, so that the direct current motor stops working, and the use safety of the ice cream machine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular to an extrusion molding mechanism control circuit of an ice cream machine and the ice cream machine. Background Art

[0002] Ice cream machines are specially designed equipment for producing ice cream. Ice cream machines include commercial ice cream machines and household ice cream machines. Household ice cream machines are generally smaller in size and include a cup barrel for placing materials, a cutter, a lifting mechanism, a rotating mechanism and an extrusion molding mechanism. The lifting mechanism and the rotating mechanism control the rotation of the cutter and the up and down movement of the cup barrel to complete the production of ice cream. The cup barrel containing the crushed ice cream is installed in the extrusion molding mechanism to obtain ice cream of the corresponding shape.

[0003] In the extrusion molding mechanism of the ice cream machine, a DC motor is usually used to drive the ice cream out of a structure designed with a corresponding pattern (such as a five-pointed star, etc.). However, due to the different hardness of different ice cream materials, if the DC motor has an overcurrent due to overload or other reasons, it will pose a safety hazard.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an extrusion molding mechanism control circuit of an ice cream machine and an ice cream machine, so as to solve the problem that the DC motor of the extrusion molding mechanism of the existing ice cream machine has a safety hazard due to overcurrent.

[0006] The technical solution of the present invention is as follows: In some embodiments, the present invention provides an extrusion molding mechanism control circuit of an ice cream machine, which includes: a microcontroller unit, a speed control module, a steering control module, a speed detection module and an overcurrent protection module; The speed control module is used to connect to the DC motor and the micro control unit, and the speed control module is used to access the AC power, rectify the AC power to power the DC motor, and control the speed of the DC motor according to the speed control signal output by the micro control unit; The steering control module is used to be connected to the DC motor and to the micro control unit, and the steering control module is used to control the steering of the DC motor according to the steering control signal output by the micro control unit; The speed detection module is connected to the micro control unit, and the speed detection module is used to detect the speed of the DC motor and feed back the speed signal to the micro control unit; The overcurrent protection module is used to access the first power supply voltage and is connected to the steering control module. The overcurrent protection module is used to perform overcurrent detection on the DC motor and disconnect the starting power supply voltage of the steering control module when an overcurrent state of the DC motor is detected; The microcontrol unit is respectively connected to the speed control module, the steering control module and the speed detection module, and is used to output a speed control signal to control the speed of the DC motor, and to output a steering control signal to control the steering of the DC motor, and to adjust the speed of the DC motor according to the speed signal.

[0007] According to a further configuration of the present invention, the overcurrent protection module comprises: a current sensor, a comparison unit, a self-locking unit and a switch unit; The current sensor is connected to the speed control module and the steering control module respectively, and the current sensor is used to detect the input current of the DC motor and output the output voltage to the comparison unit; The comparison unit is connected to the current sensor and the self-locking unit respectively, and the comparison unit is used to control the working state of the self-locking unit according to the output voltage; The self-locking unit is connected to the switch unit, and the self-locking unit is used to control the working state of the switch unit; The switch unit is used to access the first power supply voltage and is connected to the steering control module. The switch unit is used to control the opening and closing of the startup power supply voltage flowing to the steering control module.

[0008] According to a further configuration of the present invention, the comparison unit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor and a comparator; One end of the first resistor is connected to the output end of the current sensor, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the non-inverting input end of the comparator; One end of the third resistor is connected to the second power supply voltage, and the other end of the third resistor is connected to the inverting input end of the comparator; The output end of the comparator is connected to one end of the fourth resistor and one end of the fifth resistor, the power supply end of the comparator is connected to the second power supply voltage, the other end of the fourth resistor is connected to the self-locking unit, and the other end of the fifth resistor is connected to the second power supply voltage; One end of the first capacitor is connected to the second power supply voltage and connected to the power supply end of the comparator, and the other end of the first capacitor is grounded; One end of the sixth resistor is connected to the non-inverting input end of the comparator and one end of the second capacitor, the other end of the sixth resistor is grounded, and the other end of the second capacitor is grounded; One end of the seventh resistor is connected to the inverting input terminal of the comparator and one end of the third capacitor, the other end of the seventh resistor is grounded, and the other end of the third capacitor is grounded.

[0009] According to a further configuration of the present invention, the self-locking unit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first triode, a second triode and a third triode; One end of the eighth resistor is connected to the base of the first transistor and the other end of the fourth resistor, and the other end of the eighth resistor is grounded; One end of the fourth capacitor is connected to the other end of the fourth resistor and the base of the first transistor respectively, and the other end of the fourth capacitor is grounded; One end of the fifth capacitor is connected to the other end of the fourth resistor respectively, and the other end of the fifth capacitor is grounded; The collector of the first transistor is connected to one end of the ninth resistor, the other end of the ninth resistor is respectively connected to the base of the second transistor, one end of the sixth capacitor and one end of the tenth resistor, the emitter of the first transistor is grounded, and the other end of the sixth capacitor is grounded; The other end of the tenth resistor is connected to one end of the eleventh resistor and the switch unit, and the other end of the eleventh resistor is connected to the second power supply voltage; The drain of the second triode is respectively connected to one end of the twelfth resistor and one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to the second power supply voltage, the other end of the twelfth resistor is respectively connected to one end of the fourteenth resistor, one end of the seventh capacitor and the base of the third triode, the other end of the fourteenth resistor is grounded, the other end of the seventh capacitor is grounded, and the emitter of the second triode is grounded; The drain of the third transistor is connected to the switch unit, and the emitter of the third transistor is grounded.

[0010] According to a further configuration of the present invention, the switch unit includes: a fourth triode, a fifth triode, a fifteenth resistor and an eighth capacitor; The base of the fourth transistor is connected to the other end of the tenth resistor, one end of the eleventh resistor and the drain of the third transistor, the drain of the fourth transistor is connected to the base of the fifth transistor, and the emitter of the fourth transistor is grounded; The emitter of the fifth transistor is connected to the first power supply voltage, the drain of the fifth transistor is connected to one end of the fifteenth resistor, one end of the eighth capacitor and the steering control module, the other end of the fifteenth resistor is grounded, and the other end of the eighth capacitor is grounded; When the fifth transistor is turned on, a starting power supply voltage is output to the steering control module.

[0011] According to a further configuration of the present invention, the first transistor, the second transistor, the third transistor and the fourth transistor are NPN transistors, and the fifth transistor is a PNP transistor; and the resistance of the tenth resistor and the eleventh resistor connected in series is less than the resistance of the twelfth resistor and the thirteenth resistor connected in series.

[0012] According to a further configuration of the present invention, the speed control module includes: a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, an optical coupler, a thyristor and a rectifier bridge; One end of the sixteenth resistor is connected to the speed control signal, the other end of the sixteenth resistor is connected to the second pin of the optocoupler, the fourth pin of the optocoupler is respectively connected to the control end of the thyristor and one end of the seventeenth resistor, the sixth pin of the optocoupler is connected to one end of the eighteenth resistor, and the first pin of the optocoupler is connected to the second power supply voltage; The other end of the eighteenth resistor is connected to the anode of the thyristor, and the other end of the seventeenth resistor is connected to the cathode of the thyristor; The anode of the thyristor is connected to the second pin of the rectifier bridge; The third pin of the rectifier bridge is connected to the alternating current, and the first pin of the rectifier bridge is connected to the current sensor; The cathode of the thyristor is connected to the positive electrode of the DC motor.

[0013] In a further configuration of the present invention, the steering control module includes: a nineteenth resistor, a ninth capacitor, a first diode, a second diode, a tenth capacitor, a twentieth resistor, a twenty-first resistor, a sixth transistor, a third diode and a first relay; and also includes: a twenty-second resistor, an eleventh capacitor, a fourth diode, a fifth diode, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor, a seventh transistor, a sixth diode and a second relay; One end of the nineteenth resistor is connected to the first switch signal, the other end of the nineteenth resistor is connected to one end of the ninth capacitor, and the other end of the ninth capacitor is connected to the cathode of the first diode and the anode of the second diode; The anode of the first diode is connected to one end of the tenth capacitor, the cathode of the second diode is connected to the other end of the tenth capacitor and one end of the twentieth resistor respectively, and the other end of the tenth capacitor is connected to one end of the twentieth resistor; The other end of the 20th resistor is respectively connected to one end of the 21st resistor and the base of the sixth transistor, and the other end of the 21st resistor is grounded; The collector of the sixth transistor is connected to the anode of the third diode and the first pin of the first relay respectively, the emitter of the sixth transistor is grounded, the cathode of the third diode is connected to the second pin of the first relay, and the second pin of the first relay is connected to the starting power supply voltage; The third pin of the first relay is connected to the negative pole of the DC motor, and the fifth pin of the first relay is grounded; One end of the 22nd resistor is connected to the second switch signal, the other end of the 22nd resistor is connected to one end of the 11th capacitor, and the other end of the 11th capacitor is connected to the cathode of the fourth diode and the anode of the fifth diode; An anode of the fourth diode is connected to one end of the twelfth capacitor, a cathode of the fifth diode is connected to the other end of the twelfth capacitor and one end of the twenty-third resistor respectively, and the other end of the twelfth capacitor is connected to one end of the twenty-third resistor; The other end of the twenty-third resistor is respectively connected to one end of the twenty-fourth resistor and the base of the seventh transistor, and the other end of the twenty-fourth resistor is grounded; The collector of the seventh transistor is connected to the anode of the sixth diode and the first pin of the second relay respectively, the emitter of the seventh transistor is grounded, the cathode of the seventh transistor is connected to the second pin of the second relay, and the second pin of the second relay is connected to the starting power supply voltage; The third pin of the second relay is connected to the positive pole of the DC motor, the fourth pin of the second relay is connected to the fourth pin of the first relay, and the fifth pin of the second relay is grounded; A common terminal of the fourth pin of the first relay and the fourth pin of the second relay is connected to the current sensor.

[0014] According to a further configuration of the present invention, the rotation speed detection module includes: a Hall sensor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a thirteenth capacitor, a fourteenth capacitor and a fifteenth capacitor; The Hall sensor is connected to the micro control unit via a connector; One end of the twenty-fifth resistor is connected to the third power supply voltage, and the other end of the twenty-fifth resistor is connected to the first pin of the connector; One end of the twenty-sixth resistor is connected to one end of the twenty-fifth resistor, and the other end of the twenty-sixth resistor is connected to the third pin of the connector; One end of the twenty-seventh resistor is connected to the other end of the twenty-sixth resistor and the third pin of the connector respectively, and the other end of the twenty-seventh resistor is connected to the micro control unit; One end of the thirteenth capacitor is connected to the other end of the twenty-fifth resistor, and the other end of the thirteenth capacitor is grounded; One end of the fourteenth capacitor is connected to one end of the twenty-seventh resistor, and the other end of the fourteenth capacitor is grounded; One end of the fifteenth capacitor is connected to the other end of the twenty-seventh resistor, and the other end of the fifteenth capacitor is grounded.

[0015] In a second aspect, the present invention provides an ice cream machine, which comprises the extrusion molding mechanism control circuit of the ice cream machine as described above.

[0016] The present invention provides an extrusion molding mechanism control circuit of an ice cream machine and an ice cream machine, wherein the control circuit includes a microcontroller unit, a speed control module, a steering control module, a speed detection module and an overcurrent protection module; the speed control module is used to connect to alternating current, rectify the alternating current to power a direct current motor, and control the speed of the direct current motor according to a speed control signal output by the microcontroller unit; the steering control module is used to control the steering of the direct current motor according to a steering control signal output by the microcontroller unit; the speed detection module is used to detect the speed of the direct current motor and feed back the speed signal to the microcontroller unit; the overcurrent protection module is used to perform overcurrent detection on the direct current motor, and disconnect the starting power supply voltage of the steering control module when an overcurrent state of the direct current motor is detected; the microcontroller unit is used to output a speed control signal to control the speed of the direct current motor, and is used to output a steering control signal to control the steering of the direct current motor, and is used to adjust the speed of the direct current motor according to the speed signal. The present invention detects the working current of the direct current motor, and when it is detected that the direct current motor causes overcurrent due to factors such as overload, the overcurrent protection module will disconnect the starting power supply voltage of the steering control module, so that the direct current motor stops working, thereby improving the safety of the ice cream machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 It is a principle block diagram of the control circuit of the extrusion molding mechanism of the ice cream machine in the present invention.

[0019] Figure 2 The structure of an ice cream machine in one embodiment of the present invention is shown in FIG. Figure 1 .

[0020] Figure 3 The structure of an ice cream machine in one embodiment of the present invention is shown in FIG. Figure 2 .

[0021] Figure 4 It is a circuit schematic diagram of the overcurrent protection module in the present invention.

[0022] Figure 5 It is a circuit schematic diagram of the speed control module, the steering control module and the speed detection module in the present invention.

[0023] Figure 6 It is a circuit schematic diagram of the micro control unit in the present invention.

[0024] The marks in the accompanying drawings are: 100, micro control unit; 200, speed control module; 300, steering control module; 400, speed detection module; 500, overcurrent protection module; 510, comparison unit; 520, self-locking unit; 530, switch unit; 10, main body; 20, cup barrel; 30, tool; 40, extrusion molding mechanism. DETAILED DESCRIPTION

[0025] The present invention provides an extrusion molding mechanism control circuit of an ice cream machine and an ice cream machine. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] It should be further understood that the wording "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can also be an intermediate element. In addition, the "connection" or "coupling" used here can include wireless connection or wireless coupling. The wording "and / or" used here includes all or any unit and all combinations of one or more items listed in association.

[0028] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0029] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Please also see Figures 1 to 6 The present invention provides a preferred embodiment of a control circuit for an extrusion molding mechanism of an ice cream machine.

[0031] In some embodiments, Figure 1 and Figure 6As shown, the present invention provides an extrusion molding mechanism control circuit of an ice cream machine, which includes: a microcontroller unit 100, a speed control module 200, a steering control module 300, a speed detection module 400 and an overcurrent protection module 500. The speed control module 200 is used to be connected to a DC motor and connected to the microcontroller unit 100. The speed control module 200 is used to access AC power, rectify the AC power to power the DC motor, and control the speed of the DC motor according to the speed control signal output by the microcontroller unit 100; the steering control module 300 is used to be connected to the DC motor and connected to the microcontroller unit 100. The steering control module 300 is used to control the steering of the DC motor according to the steering control signal output by the microcontroller unit 100; the speed detection module 400 is connected to the microcontroller unit 100. The speed detection module 400 is used to detect the speed of the DC motor and turn the DC motor The speed signal is fed back to the microcontroller unit 100; the overcurrent protection module 500 is used to access the first power supply voltage and is connected to the steering control module 300. The overcurrent protection module 500 is used to detect overcurrent of the DC motor and disconnect the starting power supply voltage of the steering control module 300 when an overcurrent state of the DC motor is detected; the microcontroller unit 100 is respectively connected to the speed control module 200, the steering control module 300 and the speed detection module 400, and is used to output a speed control signal to control the speed of the DC motor, and to output a steering control signal to control the steering direction of the DC motor, and to adjust the speed of the DC motor according to the speed signal.

[0032] Specifically, please combine Figure 2 and Figure 3 The ice cream machine includes a main body 10, a cup barrel 20, a cutter 30, a cutter lifting mechanism, a cutter rotating mechanism, an extrusion molding mechanism 40, etc. The cutter 30 can rotate and lift under the drive of a rotating motor and a lifting motor, and the DC motor can drive the extrusion molding mechanism 40 to move, so that the ice cream in the extrusion molding mechanism 40 can be squeezed out from the extrusion molding mechanism 40 according to the set shape.

[0033] In a specific implementation, after selecting the corresponding ice cream working mode, the micro control unit 100 obtains the control parameters corresponding to the ice cream type, controls the rotation drive motor to work, and controls the lifting motor to work according to the control parameters. After the preparation of the ice cream is completed, the cup bucket 20 containing the ice cream is installed in the extrusion molding mechanism 40, and then the DC motor is driven to work so that the ice cream is extruded in the extrusion molding mechanism 40 to obtain the required shape.

[0034] Among them, the first power supply voltage (+12V) is obtained by rectifying and reducing the voltage of the alternating current AC by the switching power supply module of the ice cream machine. The speed control module 200 can rectify the connected alternating current to power the DC motor, and the speed control module 200 can adjust the speed of the DC motor under the speed control signal output by the micro control unit 100. The steering control module 300 can control the steering of the DC motor. When it is necessary to extrude ice cream, the DC motor can be controlled to rotate forward. After completing the extrusion molding process of an ice cream, the steering control module 300 controls the DC motor to reverse, so that the DC motor returns to the initial position. The DC motor can be repeatedly rotated forward and reversed to complete the molding of multiple ice creams.

[0035] In this process, the speed detection module 400 can detect the speed of the DC motor, and the microcontroller unit 100 can adjust the speed of the DC motor according to the speed signal fed back by the speed detection module 400, so that the DC motor can work at the speed in the preset mode. In addition, during the operation of the DC motor, the overcurrent protection module 500 can detect the input current of the DC motor in real time. When it is detected that the DC motor has an overcurrent due to overload or other reasons, the overcurrent protection module 500 can disconnect the starting power supply voltage of the steering control module 300, so that the steering control module 300 cannot work, thereby cutting off the power supply of the DC motor and stopping the DC motor, thereby avoiding safety hazards caused by overcurrent of the DC motor, such as motor burning, equipment damage, fire, etc., and improving the safety of the ice cream machine.

[0036] In some embodiments, Figure 4 As shown, the overcurrent protection module 500 includes: a current sensor U1, a comparison unit 510, a self-locking unit 520 and a switch unit 530. The current sensor U1 is connected to the speed control module 200 and the steering control module 300 respectively, and the current sensor U1 is used to detect the input current of the DC motor and output the output voltage to the comparison unit 510; the comparison unit 510 is connected to the current sensor U1 and the self-locking unit 520 respectively, and the comparison unit 510 is used to control the working state of the self-locking unit 520 according to the output voltage; the self-locking unit 520 is connected to the switch unit 530, and the self-locking unit 520 is used to control the working state of the switch unit 530; the switch unit 530 is used to access the first power supply voltage and is connected to the steering control module 300, and the switch unit 530 is used to control the opening and closing of the starting power supply voltage flowing to the steering control module 300.

[0037] Specifically, the primary current detection terminal (pin 1, pin 2, pin 3 and pin 4) of the current sensor U1 detects the input current of the connected DC motor M1 in real time, and outputs an output voltage Vout to the comparison unit 510 at the output terminal (pin 7), and the comparison unit 510 compares the output voltage Vout with the reference voltage. If the output voltage Vout is less than the reference voltage, the self-locking unit 520 controls the switch unit 530 to be in the on state, the switch unit 530 is connected to the first power supply voltage, and outputs the starting power supply voltage to the steering control module 300, and the DC motor can work normally; if the output voltage is greater than the reference voltage, it means that the DC motor is overcurrent, and the self-locking unit 520 controls the switch unit 530 to be in the off state, so that the first power supply voltage is disconnected, so that the starting power supply voltage cannot be input to the steering control module 300, then the steering control module 300 will not work, and the DC motor will not work, so that the DC motor can stop working when the DC motor is overcurrent.

[0038] In some embodiments, Figure 4 As shown, the comparison unit 510 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a comparator U2. One end of the first resistor R1 is connected to the output end of the current sensor U1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the non-inverting input end of the comparator U2; one end of the third resistor R3 is connected to the second power supply voltage, and the other end of the third resistor R3 is connected to the inverting input end of the comparator U2; the output end of the comparator U2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the power supply end of the comparator U2 is connected to the second power supply voltage, and the other end of the fourth resistor R4 is connected to the self-locking unit 520 The fifth resistor R5 is connected to the second power supply voltage; one end of the first capacitor C1 is connected to the second power supply voltage and is connected to the power supply end of the comparator U2, and the other end of the first capacitor C1 is grounded; one end of the sixth resistor R6 is connected to the non-inverting input end of the comparator U2 and one end of the second capacitor C2, the other end of the sixth resistor R6 is grounded, and the other end of the second capacitor C2 is grounded; one end of the seventh resistor R7 is connected to the inverting input end of the comparator and one end of the third capacitor C3, the other end of the seventh resistor R7 is grounded, and the other end of the third capacitor C3 is grounded.

[0039] For further information, see Figure 4The self-locking unit 520 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first transistor Q1, a second transistor Q2 and a third transistor Q3. One end of the eighth resistor R8 is connected to the base of the first transistor Q1 and the other end of the fourth resistor R4, and the other end of the eighth resistor R8 is grounded; one end of the fourth capacitor C4 is respectively connected to the other end of the fourth resistor R4 and the base of the first transistor Q1, and the other end of the fourth capacitor C4 is grounded; one end of the fifth capacitor C5 is respectively connected to the other end of the fourth resistor R4, and the other end of the fifth capacitor C5 is grounded; the collector of the first transistor Q1 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is respectively connected to the base of the second transistor Q2, one end of the sixth capacitor C6 and one end of the tenth resistor R10, the emitter of the first transistor Q1 is grounded, and the other end of the sixth capacitor C6 is grounded; The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the switch unit 530, and the other end of the eleventh resistor R11 is connected to the second power supply voltage; the drain of the second transistor Q2 is respectively connected to one end of the twelfth resistor R12 and one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the second power supply voltage, the other end of the twelfth resistor R12 is respectively connected to one end of the fourteenth resistor R14, one end of the seventh capacitor C7 and the base of the third transistor Q3, the other end of the fourteenth resistor R14 is grounded, the other end of the seventh capacitor C7 is grounded, and the emitter of the second transistor Q2 is grounded; the drain of the third transistor Q3 is connected to the switch unit 530, and the emitter of the third transistor Q3 is grounded.

[0040] For further information, see Figure 4The switch unit 530 includes: a fourth transistor Q4, a fifth transistor Q5, a fifteenth resistor R15 and an eighth capacitor C8. The base of the fourth transistor Q4 is connected to the other end of the tenth resistor R10, one end of the eleventh resistor R11 and the drain of the third transistor Q3, the drain of the fourth transistor Q4 is connected to the base of the fifth transistor Q5, and the emitter of the fourth transistor Q4 is grounded; the emitter of the fifth transistor Q5 is connected to the first power supply voltage, the drain of the fifth transistor Q5 is connected to one end of the fifteenth resistor R15, one end of the eighth capacitor C8 and the steering control module 300, the other end of the fifteenth resistor R15 is grounded, and the other end of the eighth capacitor C8 is grounded; when the fifth transistor Q5 is turned on, it outputs the startup power supply voltage to the steering control module 300.

[0041] Specifically, the output voltage Vout output by the current sensor U1 is input to the non-inverting input terminal of the comparator U2 via the first resistor R1 and the second resistor R2. The second power supply voltage (+5V EN) is provided by the microcontroller 100 and may be +5V. The second power supply voltage is input to the inverting input terminal of the comparator U2 via the third resistor R3 as a reference voltage of the comparator U2. If the output voltage Vout is greater than the reference voltage, the comparator U2 outputs a high level. If the output voltage Vout is less than the reference voltage, the comparator U2 outputs a low level.

[0042] Among them, the first transistor Q1, the second transistor Q2, the third transistor Q3 and the fourth transistor Q4 are NPN transistors, and the fifth transistor Q5 is a PNP transistor; the resistance of the tenth resistor R10 and the eleventh resistor R11 connected in series is less than the resistance of the twelfth resistor R12 and the thirteenth resistor R13 connected in series.

[0043] When the DC motor works normally, the output voltage Vout is less than the reference voltage, the comparator U2 outputs a low level, and the first transistor Q1 is in a disconnected state. Since the resistance value of the series connection of the tenth resistor R10 and the eleventh resistor R11 is less than the resistance value of the series connection of the twelfth resistor R12 and the thirteenth resistor R13, the second power supply voltage preferentially drives the second transistor Q2 to turn on through the tenth resistor R10 and the eleventh resistor R11, at which time the potential of the node TP1 is pulled down, the third transistor Q3 is in a disconnected state, the second power supply voltage drives the fourth transistor Q4 to turn on, the base voltage of the fifth transistor Q5 is pulled down, the fifth transistor Q5 is turned on, and the first power supply voltage outputs the start-up power supply voltage (+12V Switch) to the steering control module 300 after passing through the fifth transistor Q5.

[0044] When the DC motor has an overcurrent condition, the output voltage Vout is greater than the reference voltage, the comparator U2 outputs a high level, the first transistor Q1 is in a conducting state, and the node TP2 is in a low level state, the second transistor Q2 is disconnected, and the node TP1 is in a high level state, and the second power supply voltage drives the third transistor Q3 to conduct after passing through the twelfth resistor R12 and the thirteenth resistor R13, and the third transistor Q3 is turned on to pull down the base voltage of the fourth transistor Q4, that is, the potential of the node OCP is low, the fourth transistor Q4 is in a disconnected state, and the fifth transistor Q5 is disconnected, so that the starting power supply voltage (+12V Switch) cannot be input to the steering control module 300, thereby controlling the DC motor to stop working. It should be noted that when the third transistor Q3 is turned on, the node OCP is always in a low level state, so the DC motor can only work normally after the power supply of the ice cream machine is restarted.

[0045] In some embodiments, Figure 5As shown, the speed control module 200 includes: a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, an optical coupler U3, a thyristor TA1 and a rectifier bridge BR1. One end of the sixteenth resistor R16 is connected to the speed control signal TRIAC1, the other end of the sixteenth resistor R16 is connected to the second pin of the optocoupler U3, the fourth pin of the optocoupler U3 is respectively connected to the control end of the thyristor TA1 and one end of the seventeenth resistor R17, the sixth pin of the optocoupler U3 is connected to one end of the eighteenth resistor R18, and the first pin of the optocoupler U3 is connected to the second power supply voltage; the other end of the eighteenth resistor R18 is connected to the anode of the thyristor TA1, and the other end of the seventeenth resistor R17 is connected to the cathode of the thyristor TA1; the anode of the thyristor TA1 is connected to the second pin of the rectifier bridge BR1; the third pin of the rectifier bridge BR1 is connected to the alternating current AC, and the first pin of the rectifier bridge BR1 is connected to the current sensor U1; the cathode of the thyristor TA1 is connected to the positive pole of the DC motor M1.

[0046] Specifically, the third pin of the rectifier bridge BR1 is connected to the alternating current AC and outputs the rectified power after rectification. The first pin of the optical coupler U3 is connected to the second power supply voltage (+5V EN) provided by the micro control unit 100. The thyristor TA1 is connected between the rectifier bridge BR1 and the DC motor M1. The speed control signal TRIAC1 is an AC pulse signal. The speed control signal TRIAC1 controls the control end of the thyristor TA1 after passing through the optical coupler U3 to achieve speed control of the DC motor M1.

[0047] In some embodiments, Figure 5As shown, the steering control module 300 includes: a nineteenth resistor R19, a ninth capacitor C9, a first diode D1, a second diode D2, a tenth capacitor C10, a twentieth resistor R20, a twenty-first resistor R21, a sixth transistor Q6, a third diode D3 and a first relay RY1; and also includes: a twenty-second resistor R22, an eleventh capacitor C11, a fourth diode D4, a fifth diode D5, a twelfth capacitor C12, a twenty-third resistor R23, a twenty-fourth resistor R24, a seventh transistor Q7, a sixth diode D6 and a second relay RY2.One end of the nineteenth resistor R19 is connected to the first switch signal RELAY1, the other end of the nineteenth resistor R19 is connected to one end of the ninth capacitor C9, the other end of the ninth capacitor C9 is connected to the cathode of the first diode D1 and the anode of the second diode D2; the anode of the first diode D1 is connected to one end of the tenth capacitor C10, the cathode of the second diode D2 is respectively connected to the other end of the tenth capacitor C10 and one end of the twentieth resistor R20, the other end of the tenth capacitor C10 is connected to one end of the twentieth resistor R20; the other end of the twentieth resistor R20 is respectively connected to one end of the twenty-first resistor R21 and the sixth transistor The base of the sixth transistor Q6 is connected, and the other end of the twenty-first resistor R21 is grounded; the collector of the sixth transistor Q6 is respectively connected to the anode of the third diode D3 and the first pin of the first relay RY1, the emitter of the sixth transistor Q6 is grounded, the cathode of the third diode D3 is connected to the second pin of the first relay RY1, and the second pin of the first relay RY1 is connected to the starting power supply voltage; the third pin of the first relay RY1 is connected to the negative electrode of the DC motor M1, and the fifth pin of the first relay RY1 is grounded; one end of the twenty-second resistor R22 is connected to the second switch signal RELAY2, and the other end of the twenty-second resistor R22 is connected to the eleventh capacitor C11 The anode of the fourth diode D4 is connected to one end of the twelfth capacitor C12, the cathode of the fifth diode D5 is connected to the other end of the twelfth capacitor C12 and one end of the twenty-third resistor R23, and the other end of the twelfth capacitor C12 is connected to one end of the twenty-third resistor R23; the other end of the twenty-third resistor R23 is connected to one end of the twenty-fourth resistor R24 ​​and the base of the seventh transistor Q7, and the other end of the twenty-fourth resistor R24 ​​is grounded; the collector of the seventh transistor Q7 is connected to the base of the twenty-fourth resistor R24 ​​and the base of the seventh transistor Q7, respectively. The anode of the sixth diode D6 is connected to the first pin of the second relay RY2, the emitter of the seventh transistor Q7 is grounded, the cathode of the seventh transistor Q7 is connected to the second pin of the second relay RY2, and the second pin of the second relay RY2 is connected to the starting power supply voltage; the third pin of the second relay RY2 is connected to the positive electrode of the DC motor M1, the fourth pin of the second relay RY2 is connected to the fourth pin of the first relay RY1, and the fifth pin of the second relay RY2 is grounded; the common terminal of the fourth pin of the first relay RY1 and the fourth pin of the second relay RY2 is connected to the primary current detection input terminal (pin 3 and pin 4) of the current sensor U1.

[0048] Specifically, the steering control signal includes a first switch signal RELAY1 and a second switch signal RELAY2, and the first switch signal RELAY1 and the second switch signal RELAY2 are pulse width modulation (PWM) signals. The steering unit composed of the nineteenth resistor R19, the ninth capacitor C9, the first diode D1, the second diode D2, the tenth capacitor C10, the twentieth resistor R20, the twenty-first resistor R21, the sixth transistor Q6, the third diode D3 and the first relay RY1 is connected to the positive electrode of the DC motor M1, and the steering unit of this part is connected to the first switch signal RELAY1 to control the opening or closing of the first relay RY1. In the initial state, the fifth pin (ground terminal) of the first relay RY1 is connected to the third pin (common terminal), the fourth pin (power supply terminal) is disconnected, and the positive electrode of the DC motor M1 is grounded. When the first relay RY1 is energized and attracted, the fourth pin (power supply terminal) of the first relay RY1 is connected to the fifth pin (common terminal), and the positive electrode of the DC motor M1 is connected to the power supply voltage. The steering unit composed of the twenty-second resistor R22, the eleventh capacitor C11, the fourth diode D4, the fifth diode D5, the twelfth capacitor C12, the twenty-third resistor R23, the twenty-fourth resistor R24, the seventh transistor Q7, the sixth diode D6 and the second relay RY2 is connected to the negative electrode of the DC motor M1. This part of the steering unit is connected to the second switch signal RELAY2 to control the opening and closing of the second relay RY2. In the initial state, the fifth pin (ground terminal) of the second relay RY2 is connected to the third pin (common terminal), the fourth pin (power supply terminal) is disconnected, and the negative electrode of the DC motor is grounded. When the second relay RY2 is energized and attracted, the fourth pin (power supply terminal) of the second relay RY2 is connected to the fifth pin (common terminal), and the negative electrode of the DC motor M1 is connected to the power supply voltage.

[0049] The steering control of the DC motor M1 can be achieved by controlling the conduction or relationship between the normally open ends (power supply ends) of the first relay RY1 and the second relay RY2.

[0050] Furthermore, the common terminal of the fourth pin of the first relay RY1 and the fourth pin of the second relay RY2 is connected to the primary detection current input terminal (third pin and fourth pin) of the current sensor U1, and the primary detection current input terminal (first pin and second pin) of the current sensor is connected to the first pin of the rectifier bridge BR1, so that the current sensor U1 can detect the input current of the DC motor M1. Furthermore, the second pin of the first relay RY1 and the second pin of the second relay RY2 are connected to the starting power supply voltage (+12V Switch). When the current sensor U1 detects that the DC motor is overcurrent, it will control the switch unit 530 to disconnect the starting power supply voltage (+12VSwitch) through the self-locking unit 520, so that the DC motor stops working.

[0051] In some embodiments, Figure 5 As shown, the rotation speed detection module 400 includes: a Hall sensor IC1, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a thirteenth capacitor C13, a fourteenth capacitor C14 and a fifteenth capacitor C15. The Hall sensor IC1 is connected to the micro control unit 100 through the connector CN1; one end of the twenty-fifth resistor R25 is connected to the third power supply voltage (+5V), and the other end of the twenty-fifth resistor R25 is connected to the first pin of the connector CN1; one end of the twenty-sixth resistor R26 is connected to one end of the twenty-fifth resistor R25, and the other end of the twenty-sixth resistor R26 is connected to the third pin of the connector CN1; one end of the twenty-seventh resistor R27 is respectively connected to the other end of the twenty-sixth resistor R26 and the third pin of the connector CN1, and the other end of the twenty-seventh resistor R27 is connected to the micro control unit 100; one end of the thirteenth capacitor C13 is connected to the other end of the twenty-fifth resistor R25, and the other end of the thirteenth capacitor C13 is grounded; one end of the fourteenth capacitor C14 is connected to one end of the twenty-seventh resistor R27, and the other end of the fourteenth capacitor C14 is grounded; one end of the fifteenth capacitor C15 is connected to the other end of the twenty-seventh resistor R27, and the other end of the fifteenth capacitor C15 is grounded.

[0052] Specifically, the third power supply voltage (+5V) is provided by the switching power supply module of the ice cream machine. When the DC motor is working, the Hall sensor IC1 is used to sample the speed of the DC motor, and the speed signal HALL HVDC is fed back to the micro control unit 100. When the micro control unit 100 determines that the current speed of the DC motor exceeds the preset speed, the speed control signal TAIAC1 is adjusted to adjust the speed of the DC motor, so that ice cream of different hardness can be formed and the taste of the formed ice cream can be improved.

[0053] In some embodiments, the present invention provides an ice cream machine, which includes the extrusion molding mechanism control circuit of the ice cream machine as described above. Specific examples are described in an embodiment of the extrusion molding mechanism control circuit of the ice cream machine, which will not be repeated here.

[0054] In summary, the extrusion molding mechanism control circuit of an ice cream machine and the ice cream machine provided by the present invention have the following beneficial effects: By detecting the working current of the DC motor, when it is detected that the DC motor is overcurrent due to overload or other factors, the overcurrent protection module will disconnect the starting power supply voltage of the steering control module, so that the DC motor stops working, thereby improving the safety of the ice cream machine; In the steering control module and the speed control module, the steering control signal and the speed control signal use pulses to control the conduction and shutdown of the transistor. Compared with the conventional high-level and low-level control method, it can prevent the microcontroller from continuously outputting level signals when a fault occurs, causing the transistor to be always on or off. By real-time monitoring of the rotation speed of the DC motor and adjusting the rotation speed control signal, the rotation speed of the DC motor can be adjusted, so that ice cream with different degrees of softness and hardness can be formed, thereby improving the taste of the formed ice cream.

[0055] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An extrusion molding mechanism control circuit of an ice cream machine, characterized in that: include: Micro control unit, speed control module, steering control module, speed detection module and over-current protection module; The speed control module is used to connect to the DC motor and the micro control unit, and the speed control module is used to access the AC power, rectify the AC power to power the DC motor, and control the speed of the DC motor according to the speed control signal output by the micro control unit; The steering control module is used to be connected to the DC motor and to the micro control unit, and the steering control module is used to control the steering of the DC motor according to the steering control signal output by the micro control unit; The speed detection module is connected to the micro control unit, and the speed detection module is used to detect the speed of the DC motor and feed back the speed signal to the micro control unit; The overcurrent protection module is used to access the first power supply voltage and is connected to the steering control module. The overcurrent protection module is used to detect the input current of the DC motor and disconnect the starting power supply voltage of the steering control module when an overcurrent state of the DC motor is detected; The microcontrol unit is respectively connected to the speed control module, the steering control module and the speed detection module, and is used to output a speed control signal to control the speed of the DC motor, and to output a steering control signal to control the steering of the DC motor, and to adjust the speed of the DC motor according to the speed signal.

2. The extrusion molding mechanism control circuit of the ice cream machine according to claim 1, characterized in that: The overcurrent protection module includes: a current sensor, a comparison unit, a self-locking unit and a switch unit; The current sensor is connected to the speed control module and the steering control module respectively, and the current sensor is used to detect the input current of the DC motor and output the output voltage to the comparison unit; The comparison unit is connected to the current sensor and the self-locking unit respectively, and the comparison unit is used to control the working state of the self-locking unit according to the output voltage; The self-locking unit is connected to the switch unit, and the self-locking unit is used to control the working state of the switch unit; The switch unit is used to access the first power supply voltage and is connected to the steering control module. The switch unit is used to control the opening and closing of the startup power supply voltage flowing to the steering control module.

3. The extrusion molding mechanism control circuit of the ice cream machine according to claim 2, characterized in that: The comparison unit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor and a comparator; One end of the first resistor is connected to the output end of the current sensor, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the non-inverting input end of the comparator; One end of the third resistor is connected to the second power supply voltage, and the other end of the third resistor is connected to the inverting input end of the comparator; The output end of the comparator is connected to one end of the fourth resistor and one end of the fifth resistor, the power supply end of the comparator is connected to the second power supply voltage, the other end of the fourth resistor is connected to the self-locking unit, and the other end of the fifth resistor is connected to the second power supply voltage; One end of the first capacitor is connected to the second power supply voltage and connected to the power supply end of the comparator, and the other end of the first capacitor is grounded; One end of the sixth resistor is connected to the non-inverting input end of the comparator and one end of the second capacitor, the other end of the sixth resistor is grounded, and the other end of the second capacitor is grounded; One end of the seventh resistor is connected to the inverting input terminal of the comparator and one end of the third capacitor, the other end of the seventh resistor is grounded, and the other end of the third capacitor is grounded.

4. The extrusion molding mechanism control circuit of the ice cream machine according to claim 3, characterized in that: The self-locking unit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first transistor, a second transistor and a third transistor; One end of the eighth resistor is connected to the base of the first transistor and the other end of the fourth resistor, and the other end of the eighth resistor is grounded; One end of the fourth capacitor is connected to the other end of the fourth resistor and the base of the first transistor respectively, and the other end of the fourth capacitor is grounded; One end of the fifth capacitor is connected to the other end of the fourth resistor respectively, and the other end of the fifth capacitor is grounded; The collector of the first transistor is connected to one end of the ninth resistor, the other end of the ninth resistor is respectively connected to the base of the second transistor, one end of the sixth capacitor and one end of the tenth resistor, the emitter of the first transistor is grounded, and the other end of the sixth capacitor is grounded; The other end of the tenth resistor is connected to one end of the eleventh resistor and the switch unit, and the other end of the eleventh resistor is connected to the second power supply voltage; The drain of the second triode is respectively connected to one end of the twelfth resistor and one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to the second power supply voltage, the other end of the twelfth resistor is respectively connected to one end of the fourteenth resistor, one end of the seventh capacitor and the base of the third triode, the other end of the fourteenth resistor is grounded, the other end of the seventh capacitor is grounded, and the emitter of the second triode is grounded; The drain of the third transistor is connected to the switch unit, and the emitter of the third transistor is grounded.

5. The extrusion molding mechanism control circuit of the ice cream machine according to claim 4, characterized in that: The switch unit includes: a fourth transistor, a fifth transistor, a fifteenth resistor and an eighth capacitor; The base of the fourth transistor is connected to the other end of the tenth resistor, one end of the eleventh resistor and the drain of the third transistor, the drain of the fourth transistor is connected to the base of the fifth transistor, and the emitter of the fourth transistor is grounded; The emitter of the fifth transistor is connected to the first power supply voltage, the drain of the fifth transistor is connected to one end of the fifteenth resistor, one end of the eighth capacitor and the steering control module, the other end of the fifteenth resistor is grounded, and the other end of the eighth capacitor is grounded; When the fifth transistor is turned on, a starting power supply voltage is output to the steering control module.

6. The extrusion molding mechanism control circuit of the ice cream machine according to claim 5, characterized in that: The first transistor, the second transistor, the third transistor and the fourth transistor are NPN transistors, and the fifth transistor is a PNP transistor; the resistance value of the tenth resistor and the eleventh resistor connected in series is less than the resistance value of the twelfth resistor and the thirteenth resistor connected in series.

7. The extrusion molding mechanism control circuit of the ice cream machine according to claim 2, characterized in that: The speed control module includes: a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, an optical coupler, a thyristor and a rectifier bridge; One end of the sixteenth resistor is connected to the speed control signal, the other end of the sixteenth resistor is connected to the second pin of the optocoupler, the fourth pin of the optocoupler is respectively connected to the control end of the thyristor and one end of the seventeenth resistor, the sixth pin of the optocoupler is connected to one end of the eighteenth resistor, and the first pin of the optocoupler is connected to the second power supply voltage; The other end of the eighteenth resistor is connected to the anode of the thyristor, and the other end of the seventeenth resistor is connected to the cathode of the thyristor; The anode of the thyristor is connected to the second pin of the rectifier bridge; The third pin of the rectifier bridge is connected to the alternating current, and the first pin of the rectifier bridge is connected to the current sensor; The cathode of the thyristor is connected to the positive electrode of the DC motor.

8. The extrusion molding mechanism control circuit of the ice cream machine according to claim 2, characterized in that: The steering control module includes: a nineteenth resistor, a ninth capacitor, a first diode, a second diode, a tenth capacitor, a twentieth resistor, a twenty-first resistor, a sixth transistor, a third diode and a first relay; and also includes: a twenty-second resistor, an eleventh capacitor, a fourth diode, a fifth diode, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor, a seventh transistor, a sixth diode and a second relay; One end of the nineteenth resistor is connected to the first switch signal, the other end of the nineteenth resistor is connected to one end of the ninth capacitor, and the other end of the ninth capacitor is connected to the cathode of the first diode and the anode of the second diode; The anode of the first diode is connected to one end of the tenth capacitor, the cathode of the second diode is connected to the other end of the tenth capacitor and one end of the twentieth resistor respectively, and the other end of the tenth capacitor is connected to one end of the twentieth resistor; The other end of the 20th resistor is respectively connected to one end of the 21st resistor and the base of the sixth transistor, and the other end of the 21st resistor is grounded; The collector of the sixth transistor is connected to the anode of the third diode and the first pin of the first relay respectively, the emitter of the sixth transistor is grounded, the cathode of the third diode is connected to the second pin of the first relay, and the second pin of the first relay is connected to the starting power supply voltage; The third pin of the first relay is connected to the negative pole of the DC motor, and the fifth pin of the first relay is grounded; One end of the 22nd resistor is connected to the second switch signal, the other end of the 22nd resistor is connected to one end of the 11th capacitor, and the other end of the 11th capacitor is connected to the cathode of the fourth diode and the anode of the fifth diode; An anode of the fourth diode is connected to one end of the twelfth capacitor, a cathode of the fifth diode is connected to the other end of the twelfth capacitor and one end of the twenty-third resistor respectively, and the other end of the twelfth capacitor is connected to one end of the twenty-third resistor; The other end of the twenty-third resistor is respectively connected to one end of the twenty-fourth resistor and the base of the seventh transistor, and the other end of the twenty-fourth resistor is grounded; The collector of the seventh transistor is connected to the anode of the sixth diode and the first pin of the second relay respectively, the emitter of the seventh transistor is grounded, the cathode of the seventh transistor is connected to the second pin of the second relay, and the second pin of the second relay is connected to the starting power supply voltage; The third pin of the second relay is connected to the positive pole of the DC motor, the fourth pin of the second relay is connected to the fourth pin of the first relay, and the fifth pin of the second relay is grounded; A common terminal of the fourth pin of the first relay and the fourth pin of the second relay is connected to the current sensor.

9. The extrusion molding mechanism control circuit of the ice cream machine according to claim 1, characterized in that: The rotation speed detection module includes: a Hall sensor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a thirteenth capacitor, a fourteenth capacitor and a fifteenth capacitor; The Hall sensor is connected to the micro control unit via a connector; One end of the twenty-fifth resistor is connected to the third power supply voltage, and the other end of the twenty-fifth resistor is connected to the first pin of the connector; One end of the twenty-sixth resistor is connected to one end of the twenty-fifth resistor, and the other end of the twenty-sixth resistor is connected to the third pin of the connector; One end of the twenty-seventh resistor is connected to the other end of the twenty-sixth resistor and the third pin of the connector respectively, and the other end of the twenty-seventh resistor is connected to the micro control unit; One end of the thirteenth capacitor is connected to the other end of the twenty-fifth resistor, and the other end of the thirteenth capacitor is grounded; One end of the fourteenth capacitor is connected to one end of the twenty-seventh resistor, and the other end of the fourteenth capacitor is grounded; One end of the fifteenth capacitor is connected to the other end of the twenty-seventh resistor, and the other end of the fifteenth capacitor is grounded.

10. An ice cream machine, characterized in that: The invention comprises an extrusion molding mechanism control circuit of an ice cream machine as claimed in any one of claims 1 to 9.

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