Hot melting gutta-percha filling machine and control circuit thereof

Abstract

The utility model belongs to the technical field of dental medical equipment, and relates to a control circuit of a hot melting gutta-percha filling machine, the control circuit comprises a power supply part, an MCU main control unit and a motor control unit, the power supply part is electrically connected with the MCU main control unit, and the MCU main control unit is in control connection with the motor control unit; the motor control unit comprises a motor, a turn number sensor and a motor control circuit, the motor is in control connection with the MCU main control unit through the motor control circuit, and the turn number sensor is in signal connection with the MCU main control unit; the turn number sensor is used for detecting the number of turns of rotation of the motor and transmitting a turn number signal to the MCU main control unit, and the MCU main control unit outputs a switching signal to the motor control circuit based on the received turn number signal so as to control start and stop of the motor. The utility model further relates to a hot melting gutta-percha filling machine. According to the technical scheme provided by the invention, quantitative output of molten gutta-percha can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of dental medical equipment, and more specifically, to a hot melt gutta-percha filling machine and a control circuit thereof. Background Art

[0002] The hot-melt gutta-percha filling machine (Gutta Percha Obturat ion Equipment) is a hot-melt gutta-percha filling system, which is an instrument that injects heated, softened, molten gutta-percha into the root canal to replace the traditional cold lateral pressure filling. The main structure of the hot-melt gutta-percha filling machine consists of a gutta-percha needle, a host, a battery, a heating needle, etc. The power supply of the equipment is provided by an internal rechargeable battery. Under the action of the power supply, the heating needle converts electrical energy into internal energy to generate heat, thereby melting the gutta-percha stick inside. After the gutta-percha stick is melted, the DC motor inside the equipment provides internal thrust under the action of the DC power supply to push the molten gutta-percha out of the gutta-percha needle.

[0003] Traditional hot-melt gutta-percha filling machines usually use manually controlled motor operation to push out the molten gutta-percha inside. However, since the motor operation time and motor thrust cannot be accurately controlled during the gutta-percha pushing process, dentists are required to make subjective judgments, resulting in an uncertain output of gutta-percha and an inability to accurately control the output. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present application is that the traditional hot melt gutta-percha filling machine cannot accurately control the output amount of gutta-percha.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a control circuit of a hot melt gutta-percha filling machine, which adopts the following technical solution:

[0006] A control circuit of a hot-melt gutta-percha filling machine comprises a power supply, an MCU main control unit and a motor control unit, wherein the power supply is electrically connected to the MCU main control unit, and the MCU main control unit is control-connected to the motor control unit;

[0007] The motor control unit comprises a motor, a revolution sensor and a motor control circuit, the motor is connected to the MCU main control unit through the motor control circuit, and the revolution sensor is connected to the MCU main control unit by signal;

[0008] The revolution sensor is used to detect the revolutions of the motor and transmit a revolution signal to the MCU main control unit. The MCU main control unit outputs a switch signal to the motor control circuit based on the received revolution signal to control the start and stop of the motor.

[0009] When the hot melt gutta-percha filling machine is started, when the revolution sensor detects that the number of revolutions of the motor has not reached a preset value N, the MCU main control unit controls the motor to start; when the revolution sensor detects that the number of revolutions of the motor has reached a preset value N, the MCU main control unit controls the motor to stop; wherein, N is greater than 0.

[0010] Further, the revolution sensor is one of a Hall sensor or a photoelectric sensor;

[0011] The revolution sensor comprises a motor detection chip, a first pin of the motor detection chip is electrically connected to an MCU main control unit, a second pin of the motor detection chip is signal-connected to the MCU main control unit, and a third pin of the motor detection chip is grounded.

[0012] Furthermore, the motor control circuit includes a first signal conversion chip and a motor drive chip;

[0013] The first pin and the second pin of the first signal conversion chip are grounded, the third pin of the first signal conversion chip is electrically connected to the MCU main control unit, the fourth pin of the first signal conversion chip is connected to the second pin of the motor drive chip, the fifth pin of the first signal conversion chip is connected to the fifth pin of the motor drive chip, and the sixth pin of the first signal conversion chip is connected to the MCU main control unit;

[0014] The first pin and the third pin of the motor driver chip are respectively connected to the forward rotation end and the reverse rotation end of the motor, the fourth pin of the motor driver chip is connected to the power supply, and the sixth pin, the ninth pin and the tenth pin of the motor driver chip are connected to the MCU main control unit signal.

[0015] Furthermore, the control circuit also includes a power management circuit, and the power management circuit is connected between the power supply and the MCU main control unit.

[0016] Furthermore, the power management circuit includes a first chip, a first field effect transistor, a first switch, a first resistor and a first transistor;

[0017] The first pin and the third pin of the first chip are connected to the drain of the first field effect transistor, the second pin of the first chip is grounded, and the fifth pin of the first chip is connected to the MCU main control unit;

[0018] The gate of the first field effect transistor is connected to the MCU main control unit, and the source of the first field effect transistor is connected to the power supply;

[0019] One end of the first switch is connected between the gate of the first field effect tube and the MCU main control unit, and the other end is grounded;

[0020] The first resistor is connected between the gate and the source of the first field effect transistor;

[0021] The collector of the first transistor is connected to the gate of the first field effect transistor, the base of the first transistor is connected to the MCU main control unit, and the emitter of the first transistor is grounded.

[0022] Furthermore, the power management circuit also includes a first diode, the anode of the first diode is connected to the drain of the first field effect transistor, and the cathode of the first transistor is connected to the source of the first field effect transistor.

[0023] Furthermore, the control circuit also includes a heating control unit, which includes a heating element and a heating control circuit, and the heating element is controlled and connected to the MCU main control unit through the heating control circuit.

[0024] Furthermore, the heating control circuit includes a second signal conversion chip, a second field effect transistor, a third field effect transistor, a second triode and a second resistor;

[0025] The first pin, the second pin and the fifth pin of the second signal conversion chip are grounded, the third pin of the second signal conversion chip is electrically connected to the MCU main control unit, the fourth pin of the second signal conversion chip is connected to the source of the third field effect tube and the heating element, and the sixth pin of the second signal conversion chip is connected to the MCU main control unit;

[0026] The source of the second field effect transistor is connected to the power supply, the gate of the second field effect transistor is connected to the collector of the second transistor, and the drain of the second field effect transistor is connected to the drain of the third field effect transistor;

[0027] The gate of the third field effect transistor is connected to the collector of the second transistor;

[0028] The base of the second transistor is electrically connected to the MCU main control unit, and the emitter of the second transistor is grounded;

[0029] One end of the second resistor is connected between the drain of the second field effect transistor and the drain of the third field effect transistor, and the other end is connected to the collector of the second transistor.

[0030] Furthermore, the heating control unit further comprises a temperature measuring circuit, and the temperature measuring circuit comprises a temperature measuring element and a third signal conversion chip;

[0031] The first pin of the third signal conversion chip is grounded, the third pin of the third signal conversion chip is electrically connected to the MCU main control unit, the fourth pin and the fifth pin of the third signal conversion chip are respectively connected to the positive pole and the negative pole of the temperature measuring element, and the sixth pin of the third signal conversion chip is signal-connected to the MCU main control unit.

[0032] Further, the control circuit also includes a display unit, the display unit includes a display screen, wherein the display screen includes a communication pin and a power supply pin, the display unit is signal-connected to the MCU main control unit via the communication pin, and the display unit is electrically connected to the MCU main control unit via the power supply pin;

[0033] The control circuit also includes a key unit, the key unit includes at least one key, the key includes a key control circuit, and the key control circuit is connected to the MCU main control unit signal.

[0034] In order to solve the above technical problems, the embodiment of the present application also provides a hot melt gutta-percha filling machine, which adopts the following technical solution:

[0035] A hot melt gutta-percha filling machine comprises the control circuit as described above.

[0036] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0037] The present application provides a control circuit for a hot-melt gutta-percha filling machine, wherein the motor control unit includes a revolution sensor, which detects the number of revolutions of the motor and feeds back to the MCU main control unit. When the number of revolutions of the motor reaches a preset value, the MCU main control unit transmits a signal to the motor control circuit to control the motor to stop, thereby ensuring that the output amount of the gutta-percha is the set value each time, and accurately controlling the output amount of the gutta-percha. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the scheme of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 is a circuit block diagram of a control circuit of a hot melt gutta-percha filling machine according to an embodiment of the present application;

[0040] Figure 2 It is a circuit schematic diagram of the MCU main control unit of the embodiment of the present application;

[0041] Figure 3is a circuit schematic diagram of a motor control circuit according to an embodiment of the present application;

[0042] Figure 4 is a circuit schematic diagram of a turns sensor according to an embodiment of the present application;

[0043] Figure 5 is a circuit schematic diagram of a power management circuit according to an embodiment of the present application;

[0044] Figure 6 is a circuit schematic diagram of a heating control circuit according to an embodiment of the present application;

[0045] Figure 7 is a circuit schematic diagram of a temperature measurement circuit according to an embodiment of the present application;

[0046] Figure 8 is a circuit schematic diagram of a display unit according to an embodiment of the present application;

[0047] Fig. 9 It is a circuit schematic diagram of the key unit of the embodiment of the present application.

[0048] Reference numerals:

[0049] 1. MCU main control unit; 21. Power supply; 22. Power management circuit; 3. Motor control unit; 31. Motor; 32. Motor control circuit; 33. Turn sensor; 4. Heating control unit; 41. Heating element; 42. Heating control circuit; 43. Temperature measurement circuit; 5. Display unit; 51. Display screen; 6. Key unit; 61. First key; 62. Second key; 63. Third key. DETAILED DESCRIPTION

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] See also Figure 1 As shown, the embodiment of the present application provides a control circuit of a hot-melt gutta-percha filling machine, including: an MCU main control unit 1, a power supply 21 and a motor control unit 3, wherein the power supply is electrically connected to the MCU main control unit, and the MCU main control unit is control-connected to the motor control unit 3. In the present embodiment, the power supply 21 may be a disposable battery, a rechargeable battery, etc., and the power supply 21 is used to power the MCU main control unit 1. A preset firmware code is stored in the MCU main control unit 1, and the MCU main control unit 1 controls the motor control unit 3 to operate according to the preset firmware code, so as to realize quantitative pushing out of the gutta-percha in a molten state.

[0053] The motor control unit 3 includes a motor 31 , a revolution sensor 33 and a motor control circuit 32 . The motor 31 is control-connected to the MCU main control unit 1 via the motor control circuit 32 , and the revolution sensor 33 is signal-connected to the MCU main control unit 1 .

[0054] When the hot melt gutta-percha filling machine is started, when the revolution sensor 33 detects that the number of revolutions of the motor 31 has not reached the preset value N, the MCU main control unit 1 controls the motor 31 to start; when the revolution sensor 33 detects that the number of revolutions of the motor 31 has reached the preset value N, the MCU main control unit 1 controls the motor 31 to stop; wherein, N is greater than 0.

[0055] In this embodiment, the revolution sensor 33 is used to detect the number of revolutions of the motor 31, and feed back the detected number of revolutions to the MCU main control unit 1. The MCU main control unit outputs a switch signal to the motor control circuit based on the received revolution signal to control the start and stop of the motor, thereby achieving quantitative output of molten gutta-percha.

[0056] In this embodiment, the connection between the functional elements includes electrical connection and signal connection. The current of the power supply 21 is output to each functional element by means of electrical connection, and the signal is transmitted from the MCU main control unit 1 to each functional element by means of signal connection to control the operation of each functional element. The connection can be a wired connection or a wireless connection.

[0057] An embodiment of the present application provides a control circuit for a hot-melt gutta-percha filling machine. The control circuit, through the setting of a motor control unit 3, utilizes a motor control circuit 32 to control the start and stop of a motor 31 and maintain the motor 31 running at a constant power, so as to accurately control the running time of the motor 31 and maintain a constant thrust of the motor 31; at the same time, the motor control unit 3 includes a revolution sensor 33, which detects the number of revolutions of the motor 31 and feeds back to the MCU main control unit 1, so that when the number of revolutions of the motor 31 reaches a preset value, the MCU main control unit 1 transmits a signal to the motor control circuit 32 to control the motor 31 to stop, thereby ensuring that the output amount of the gutta-percha is the set value each time, and accurately controlling the output amount of the gutta-percha.

[0058] See also Figure 2 As shown, in this embodiment, the MCU main control unit 1 is a control chip, and a preset firmware code is stored in the control chip, wherein the first pin of the MCU main control unit 1 is a HEAT_C pin, the second pin is a Motor_Cur pin, the fourth pin is a Couper_Sam pin, the fifth pin is a VSS pin, the sixth pin is an SCL pin, the seventh pin is an SDA pin, the eighth pin is a FAULT pin, the ninth pin is a Beep pin, the tenth pin is an OLED_SDA pin, the eleventh pin is an OLED_SCL pin, the twelfth pin is an OLED_RES pin, the sixteenth pin is a VSS pin, the seventeenth pin is a VDD pin, the eighteenth pin is a KEY_ON pin, the nineteenth pin is a KEY_M pin, the twentieth pin is a Motor_Ha ll pin, the twenty-first pin is a BAT_V_EN pin, the twenty-second pin is a KEY_POWER pin, the twenty-third pin is a KEEP_PWR pin, the twenty-eighth pin is a Bat_Sam pin, and the twenty-ninth pin is an EP pin.

[0059] The fifth pin, the sixteenth pin and the twenty-ninth pin are grounded.

[0060] The MCU main control unit 1 is electrically connected to the power supply 21 via the twenty-eighth pin, and the MCU main control unit 1 is connected to the power management circuit 22 via the seventeenth pin, the twenty-second pin, and the twenty-third pin.

[0061] The MCU main control unit 1 is connected to the motor control circuit 32 via the seventeenth pin, and the MCU main control unit 1 is connected to the revolution sensor 33 via the twentieth pin.

[0062] The MCU main control unit 1 is connected to the heating control circuit 42 via the first pin, the seventeenth pin and the twenty-first pin.

[0063] In the embodiment of the present application, the MCU main control unit 1 is connected to multiple functional units respectively, and the motor control unit 3 is controlled to operate by running the internally stored firmware code, so that the hot melt gutta-percha filling machine can quantitatively push out the molten gutta-percha.

[0064] See also Figure 3 As shown, in some embodiments, the motor control circuit 32 includes a first signal conversion chip U2 and a motor driving chip U3.

[0065] The first pin and the second pin of the first signal conversion chip U2 are grounded, the third pin of the first signal conversion chip U2 is electrically connected to the seventeenth pin of the MCU main control unit 1, the fourth pin of the first signal conversion chip U2 is connected to the second pin of the motor drive chip U3, the fifth pin of the first signal conversion chip U2 is connected to the fifth pin of the motor drive chip U3, and the sixth pin of the first signal conversion chip U2 is connected to the MCU main control unit.

[0066] The first pin and the third pin of the motor driver chip U3 are respectively connected to the forward rotation end and the reverse rotation end of the motor 31, the fourth pin of the motor driver chip U3 is connected to the power supply 21, the sixth pin, the ninth pin and the tenth pin of the motor driver chip U3 are communication pins, the sixth pin of the motor driver chip U3 is signal-connected to the sixth pin of the MCU main control unit 1, the ninth pin of the motor driver chip U3 is signal-connected to the seventh pin of the MCU main control unit 1, the tenth pin of the motor driver chip U3 is signal-connected to the eighth pin of the MCU main control unit 1, and the seventh pin and the eighth pin of the motor driver chip U3 are suspended.

[0067] In the embodiment of the present application, the output power of the MCU main control unit 1 is transmitted to the motor driving chip U3 through the first signal conversion chip U2. The motor driving chip U3 receives the signal of the MCU main control unit 1 through the communication pin to control the forward or reverse rotation of the motor 31, thereby realizing the pushing out or loading of the hot melt gutta-percha.

[0068] In some embodiments, the revolution sensor 33 is a Hall sensor or a photoelectric sensor. In this embodiment, the revolution sensor 33 is a Hall sensor.

[0069] See also Figure 4 As shown, in some embodiments, the turn sensor 33 includes a motor detection chip U4, a first pin of the motor detection chip U4 is electrically connected to the seventeenth pin of the MCU main control unit 1, a second pin of the motor detection chip U4 is signal-connected to the twentieth pin of the MCU main control unit 1, and a third pin of the motor detection chip U4 is grounded.

[0070] In the embodiment of the present application, a revolution sensor 33 is provided to detect the revolution number of the motor 31 during operation, and the revolution is fed back to the MCU main control unit 1 through the second pin. The MCU main control unit 1 feeds back a signal to the motor driver chip U3 according to the firmware code stored internally. When the revolution sensor 33 detects that the revolution number of the motor 31 reaches a preset value, the motor driver chip U3 controls the motor 31 to stop rotating, thereby realizing the quantitative output of gutta-percha by the hot melt gutta-percha filling machine.

[0071] See also Figure 1 As shown, in some embodiments, the control circuit further includes a power management circuit 22, and the power management circuit 22 is connected between the power supply 21 and the MCU main control unit.

[0072] The embodiment of the present application sets a power management circuit 22 at the output end of the power supply 21, which boosts the power supply 21 when the motor 31 starts, so as to offset the voltage drop caused by the start-up of the motor 31, thereby ensuring that the power supply 21 can provide stable power supply to the motor control unit 3, so that the motor 31 can run stably, thereby ensuring that the motor 31 outputs a constant thrust and realizing accurate control of the output of the gutta-percha.

[0073] See also Figure 5 As shown, in some embodiments, the power management circuit 22 includes a first chip U1, a first field effect transistor Q1, a first switch S1, a first resistor R1 and a first transistor Q2, wherein the first transistor Q2 is an NPN transistor.

[0074] The first pin and the third pin of the first chip U1 are connected to the drain of the first field effect transistor Q1 , the second pin of the first chip U1 is grounded, and the fifth pin of the first chip U1 is connected to the seventeenth pin of the MCU main control unit 1 .

[0075] The gate of the first field effect transistor Q1 is connected to the twenty-second pin of the MCU main control unit 1 , and the source of the first field effect transistor Q1 is connected to the power supply 21 .

[0076] One end of the first switch S1 is connected between the gate of the first field effect transistor Q1 and the MCU main control unit 1 , and the other end is grounded.

[0077] The first resistor R1 is connected between the gate and source of the first field effect transistor Q1. The first resistor R1 is set to increase the speed of raising the level of the gate of the first field effect transistor Q1. In this embodiment, the resistance value of the first resistor R1 can be set to 10kΩ~20kΩ.

[0078] The collector of the first transistor Q2 is connected to the gate of the first field effect transistor Q1, the base of the first transistor Q2 is connected to the twenty-third pin of the MCU main control unit 1, and the emitter of the first transistor Q2 is grounded.

[0079] In this embodiment, after the first switch S1 is closed, the power supply 21 and the MCU main control unit 1 output current to the power management circuit 22, and the MCU main control unit 1 outputs current to the base of the first transistor Q2 to maintain the base of the first transistor Q2 at a high level, thereby turning on the first transistor Q2, and then raising the driving voltage of the gate of the first field effect transistor Q1 to achieve the conduction of the first field effect transistor Q1. After the first transistor Q2 and the first field effect transistor Q1 remain turned on, the first switch S1 is isolated to maintain the long-term operation of the power supply 21 and provide a stable output power supply.

[0080] In the embodiment of the present application, the first transistor Q2 and the first field effect transistor Q1 are combined to form a power management circuit 22, so that the MCU main control unit 1 outputs a smaller voltage to maintain the long-term operation of the power supply component 21 and provide a stable output power supply for the control circuit.

[0081] Please continue reading Figure 5 As shown, in some embodiments, the power management circuit further includes a first diode D1, the anode of the first diode D1 is connected to the drain of the first field effect transistor Q1, and the cathode of the first transistor D1 is connected to the source of the first field effect transistor Q1.

[0082] In the embodiment of the present application, a first diode D1 is further provided, and the first diode D1 is arranged in parallel with the first field effect transistor Q1. Since the diode has the functions of rectification, voltage stabilization, measurement, and transient protection, the first diode D1 can protect the first field effect transistor Q1 and prevent the first field effect transistor Q1 from being damaged due to excessive reverse current. At the same time, the first diode D1 can also increase the drain-source resistance of the first field effect transistor Q1, thereby improving the operating stability of the circuit.

[0083] See also Figure 1 As shown, in some embodiments, the control circuit further includes a heating control unit 4, and the heating control unit 4 includes a heating element 41 and a heating control circuit 42, and the heating element 41 is controlled and connected to the MCU main control unit 1 through the heating control circuit 42.

[0084] The embodiment of the present application sets a heating control unit 4, and controls the heating element 41 through the heating control circuit 42 to provide a stable heating temperature, ensuring that the gutta-percha can be heated to a uniform molten state and maintain the same fluidity, so that a certain amount of gutta-percha can be pushed out when the motor 31 provides a stable thrust, thereby achieving accurate control of the gutta-percha output.

[0085] See also Figure 6 As shown, in some embodiments, the heating control circuit 42 includes a second signal conversion chip U5, a second field effect transistor Q3, a third field effect transistor Q4, a second transistor Q5 and a second resistor R2, wherein the second transistor Q5 is an NPN transistor.

[0086] The first pin, the second pin and the fifth pin of the second signal conversion chip U5 are grounded, the third pin of the second signal conversion chip U5 is electrically connected to the seventeenth pin of the MCU main control unit 1, the fourth pin of the second signal conversion chip U5 is connected to the source of the third field effect transistor Q3 and the heating element 41, and the sixth pin of the second signal conversion chip U5 is connected to the MCU main control unit 1. In this embodiment, the heating element 41 is a heating wire.

[0087] The source of the second field effect transistor Q3 is connected to the power supply 21 , the gate of the second field effect transistor Q3 is connected to the collector of the second transistor Q5 , and the drain of the second field effect transistor Q3 is connected to the drain of the third field effect transistor Q4 .

[0088] The gate of the third field effect transistor Q4 is connected to the collector of the second transistor Q5.

[0089] The base of the second transistor Q5 is electrically connected to the twenty-first pin of the MCU main control unit 1 , and the emitter of the second transistor Q5 is grounded.

[0090] One end of the second resistor R2 is connected between the drain of the second field effect transistor Q3 and the drain of the third field effect transistor Q4, and the other end is connected to the collector of the second transistor Q5. In this embodiment, the speed at which the level of the gate of the second field effect transistor Q3 and the gate of the third field effect transistor Q4 is increased is increased by setting the second resistor R2. In this embodiment, the resistance value of the second resistor R2 can be set to 10kΩ~20kΩ.

[0091] In the embodiment of the present application, the MCU main control unit 1 outputs current to the base of the second transistor Q5, maintaining the base of the second transistor Q5 at a high level, thereby turning on the second transistor Q5, and further lowering the driving voltage of the gate of the second field effect transistor Q3 and the driving voltage of the gate of the third field effect transistor Q4, thereby achieving conduction between the second field effect transistor Q3 and the third field effect transistor Q4, thereby connecting the heating element 41 to the DC power supply 21, heating the gutta-percha, and placing the gutta-percha in a molten state waiting for the motor 31 to push it out.

[0092] See also Figure 7 As shown, in some embodiments, the heating control unit 4 further includes a temperature measuring circuit 43, and the temperature measuring circuit 43 includes a temperature measuring element and a third signal conversion chip U6. In this embodiment, the temperature measuring element is a thermocouple.

[0093] The first pin of the third signal conversion chip U6 is grounded, the third pin of the third signal conversion chip U6 is electrically connected to the seventeenth pin of the MCU main control unit 1, the fourth pin of the third signal conversion chip U6 is connected to the positive pole of the thermocouple, the fifth pin of the third signal conversion chip U6 is connected to the negative pole of the thermocouple, the sixth pin of the third signal conversion chip U6 is connected to the fourth pin of the MCU main control unit 1 signal, and the second pin of the third signal conversion chip U6 is suspended.

[0094] The embodiment of the present application further sets a temperature measuring circuit 43 to monitor the heating temperature of the gutta-percha and feeds back to the MCU main control unit 1. The MCU main control unit 1 feeds back a signal to the heating control circuit 42 according to the internally stored firmware code. When the temperature measuring circuit 43 detects that the heating temperature reaches the preset value, the MCU main control unit 1 controls the second transistor Q5 to disconnect, and the second field effect transistor Q3 and the third field effect transistor Q4 are disconnected accordingly, and the heating element 41 stops heating the gutta-percha.

[0095] See also Figure 1 As shown, in some embodiments, the control circuit also includes a display unit 5, and the display unit 5 includes a display screen 51, wherein the display screen 51 includes a communication pin and a power supply pin, and the display unit 5 is signal-connected to the MCU main control unit 1 via the communication pin, and the display unit 5 is electrically connected to the MCU main control unit 1 via the power supply pin.

[0096] See also Figure 8As shown, the communication pins of the display unit 5 include a ninth pin, a tenth pin and an eleventh pin, wherein the ninth pin of the display unit 5 is connected to the twelfth pin of the MCU main control unit 1, the tenth pin of the display unit 5 is connected to the eleventh pin of the MCU main control unit 1, and the eleventh pin of the display unit 5 is connected to the tenth pin of the MCU main control unit 1.

[0097] The power supply pins of the display unit 5 are the fifth pin and the eighth pin. The fifth pin of the display unit 5 is electrically connected to the power supply 21 , and the eighth pin of the display unit 5 is electrically connected to the seventeenth pin of the MCU main control unit 1 .

[0098] In the embodiment of the present application, a display unit 5 is provided to receive signals from the MCU main control unit 1, and to display data such as the rotation speed of the motor 31, the number of revolutions set for each operation of the motor 31, the heating temperature, the remaining power, the current amount of gutta-percha remaining, etc., so that the user can accurately grasp the current operating status of the hot melt gutta-percha filling machine.

[0099] See also Figure 1 As shown, in some embodiments, the control circuit further includes a key unit 6, the key unit 6 includes at least one key, the key includes a key control circuit, and the key control circuit is signal-connected to the MCU main control unit 1.

[0100] In this embodiment, the button unit 6 includes a first button 61, a second button 62 and a third button 63, wherein the first button 61 is a power button, the second button 62 is a run button, and the third button 63 is a switch button.

[0101] See also Fig. 9 As shown, in this embodiment, the key control circuit includes a key switch, one end of the key switch is connected to the MCU main control unit 1, and the other end is grounded.

[0102] When the button is a power button, the button switch is connected to the twenty-second pin of the MCU main control unit 1;

[0103] When the button is a run button, the button switch is connected to the eighteenth pin of the MCU main control unit 1;

[0104] When the button is a switching button, the button switch is connected to the nineteenth pin of the MCU main control unit 1 .

[0105] In this embodiment, the closing time of the key switch is less than 2 seconds, which is defined as a short press, and the closing time of the key switch is greater than 2 seconds, which is defined as a long press.

[0106] When the first button 61 is short pressed, the hot melt gutta-percha filling machine is turned on or off.

[0107] When the second button 62 is short pressed, the heating control circuit controls the heating element to heat the gutta-percha to a set temperature, and the gutta-percha is in a molten state;

[0108] When the second button 62 is long pressed, the motor control circuit controls the motor to rotate forward to push out the molten gutta-percha. When the number of turns sensor monitors that the motor rotates to a set number of turns, the motor control circuit controls the motor to stop.

[0109] When the third button 63 is short pressed for the first time, the hot melt gutta-percha filling machine switches between the heating temperature adjustment option and the motor revolutions adjustment option; when the third button 63 is long pressed for the first time, the hot melt gutta-percha filling machine selects the current adjustment option as the heating temperature adjustment option or the motor revolutions adjustment option; when the third button 63 is short pressed for the second time, the heating temperature adjustment option or the motor revolutions adjustment option is adjusted in specific values; when the third button 63 is long pressed for the second time, the hot melt gutta-percha filling machine exits the current adjustment option.

[0110] The embodiment of the present application further provides a button unit 6, and the button unit 6 is provided with a plurality of buttons connected to the MCU main control unit 1, so that the user can perform operations such as turning the hot melt gutta-percha filling machine on and off, starting functions, and switching functions.

[0111] Based on the control circuit of the above-mentioned hot-melt gutta-percha filling machine, an embodiment of the present application further provides a hot-melt gutta-percha filling machine, which includes a housing and the above-mentioned control circuit installed in the housing.

[0112] The hot melt gutta-percha filling machine provided in the embodiment of the present application is internally provided with the control circuit as described above, and by providing a power management circuit 22 at the output end of the power supply 21, when the heating element 41 and the motor 31 are started, the power supply 21 is boosted to ensure that the power supply 21 can provide stable power to the motor 31 and the heating element 41, so that the motor 31 can operate stably and the heating element 41 can provide a stable heating temperature; by further providing a heating control unit 4, the heating control circuit 42 is used to control the heating element 41 to provide a stable heating temperature, so that the fluidity of the output gutta-percha is consistent, so that a stable thrust can be used to push out a certain amount of gutta-percha; by providing a motor control unit 3, the motor control circuit 32 is used to control the operation of the motor 31, so that the duration of each operating cycle of the motor 31 is the same, and at the same time, the number of revolutions of the motor 31 in each operating cycle is monitored by the setting of the number of revolutions sensor 33 to ensure the quantitative output of the molten gutta-percha. The present application optimizes multiple aspects such as the output stability of the power supply 21, the heating stability of the heating element 41, and the monitoring of the number of turns of the motor 31 by the number of turns sensor 33, thereby achieving a stable output of gutta-percha by the hot melt gutta-percha filling machine within each operating cycle of the motor 31.

[0113] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A control circuit for a hot melt gutta-percha filling machine, characterized in that: It includes a power supply, an MCU main control unit and a motor control unit, wherein the power supply is electrically connected to the MCU main control unit, and the MCU main control unit is control-connected to the motor control unit; The motor control unit comprises a motor, a revolution sensor and a motor control circuit, the motor is connected to the MCU main control unit through the motor control circuit, and the revolution sensor is connected to the MCU main control unit by signal; The revolution sensor is used to detect the revolutions of the motor and transmit a revolution signal to the MCU main control unit. The MCU main control unit outputs a switch signal to the motor control circuit based on the received revolution signal to control the start and stop of the motor. When the hot melt gutta-percha filling machine is started, when the revolution sensor detects that the number of revolutions of the motor has not reached a preset value N, the MCU main control unit controls the motor to start; when the revolution sensor detects that the number of revolutions of the motor has reached a preset value N, the MCU main control unit controls the motor to stop; wherein, N is greater than 0.

2. The control circuit of the hot melt gutta-percha filling machine according to claim 1, characterized in that: The revolution sensor is a Hall sensor or a photoelectric sensor; The revolution sensor comprises a motor detection chip, a first pin of the motor detection chip is electrically connected to an MCU main control unit, a second pin of the motor detection chip is signal-connected to the MCU main control unit, and a third pin of the motor detection chip is grounded.

3. The control circuit of the hot melt gutta-percha filling machine according to claim 1, characterized in that: The motor control circuit includes a first signal conversion chip and a motor drive chip; The first pin and the second pin of the first signal conversion chip are grounded, the third pin of the first signal conversion chip is electrically connected to the MCU main control unit, the fourth pin of the first signal conversion chip is connected to the second pin of the motor drive chip, the fifth pin of the first signal conversion chip is connected to the fifth pin of the motor drive chip, and the sixth pin of the first signal conversion chip is connected to the MCU main control unit; The first pin and the third pin of the motor driver chip are respectively connected to the forward rotation end and the reverse rotation end of the motor, the fourth pin of the motor driver chip is connected to the power supply, and the sixth pin, the ninth pin and the tenth pin of the motor driver chip are connected to the MCU main control unit signal.

4. The control circuit of the hot melt gutta-percha filling machine according to claim 1, characterized in that: The control circuit also includes a power management circuit, and the power management circuit is connected between the power supply and the MCU main control unit.

5. The control circuit of the hot melt gutta-percha filling machine according to claim 4, characterized in that: The power management circuit includes a first chip, a first field effect transistor, a first switch, a first resistor and a first transistor; The first pin and the third pin of the first chip are connected to the drain of the first field effect transistor, the second pin of the first chip is grounded, and the fifth pin of the first chip is connected to the MCU main control unit; The gate of the first field effect transistor is connected to the MCU main control unit, and the source of the first field effect transistor is connected to the power supply; One end of the first switch is connected between the gate of the first field effect tube and the MCU main control unit, and the other end is grounded; The first resistor is connected between the gate and the source of the first field effect transistor; The collector of the first transistor is connected to the gate of the first field effect transistor, the base of the first transistor is connected to the MCU main control unit, and the emitter of the first transistor is grounded.

6. The control circuit of the hot melt gutta-percha filling machine according to claim 5, characterized in that: The power management circuit further includes a first diode, wherein an anode of the first diode is connected to a drain of the first field effect transistor, and a cathode of the first transistor is connected to a source of the first field effect transistor.

7. The control circuit of the hot melt gutta-percha filling machine according to claim 1, characterized in that: The control circuit also includes a heating control unit, which includes a heating element and a heating control circuit. The heating element is controlled and connected to the MCU main control unit through the heating control circuit.

8. The control circuit of the hot melt gutta-percha filling machine according to claim 7, characterized in that: The heating control circuit includes a second signal conversion chip, a second field effect transistor, a third field effect transistor, a second triode and a second resistor; The first pin, the second pin and the fifth pin of the second signal conversion chip are grounded, the third pin of the second signal conversion chip is electrically connected to the MCU main control unit, the fourth pin of the second signal conversion chip is connected to the source of the third field effect tube and the heating element, and the sixth pin of the second signal conversion chip is connected to the MCU main control unit; The source of the second field effect transistor is connected to the power supply, the gate of the second field effect transistor is connected to the collector of the second transistor, and the drain of the second field effect transistor is connected to the drain of the third field effect transistor; The gate of the third field effect transistor is connected to the collector of the second transistor; The base of the second transistor is electrically connected to the MCU main control unit, and the emitter of the second transistor is grounded; One end of the second resistor is connected between the drain of the second field effect transistor and the drain of the third field effect transistor, and the other end is connected to the collector of the second transistor.

9. The control circuit of the hot melt gutta-percha filling machine according to claim 8, characterized in that: The heating control unit further comprises a temperature measuring circuit, wherein the temperature measuring circuit comprises a temperature measuring element and a third signal conversion chip; The first pin of the third signal conversion chip is grounded, the third pin of the third signal conversion chip is electrically connected to the MCU main control unit, the fourth pin and the fifth pin of the third signal conversion chip are respectively connected to the positive pole and the negative pole of the temperature measuring element, and the sixth pin of the third signal conversion chip is signal-connected to the MCU main control unit.

10. The control circuit of the hot melt gutta-percha filling machine according to claim 1, characterized in that: The control circuit also includes a display unit, and the display unit includes a display screen, wherein the display screen includes a communication pin and a power supply pin, the display unit is signal-connected to the MCU main control unit via the communication pin, and the display unit is electrically connected to the MCU main control unit via the power supply pin; The control circuit also includes a key unit, the key unit includes at least one key, the key includes a key control circuit, and the key control circuit is connected to the MCU main control unit signal.

11. A hot melt gutta-percha filling machine, characterized in that: The method comprises a control circuit as claimed in any one of claims 1 to 10.

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