Tire balancing machine based on inductive control module and control method thereof

Abstract

The invention relates to the field of tire balancing machines, in particular to a tire balancing machine based on an inductive control module and a control method of the tire balancing machine. The tire balancing machine comprises a mechanical gate, a mechanical gate switch, a tire driving device, a display screen and a control circuit, the control circuit comprises a plurality of capacitive touch sensors, a touch detection circuit and a signal conversion circuit, each input end of the control circuit is connected to each output end of the touch detection circuit, each output end of the control circuit is connected to different IO pins of the main control circuit, and the control circuit is used for converting the level signals into matrix key signals; wherein the plurality of capacitive touch sensors and the touch detection circuit are integrated on the induction plate; the signal conversion circuit is integrated on the signal conversion board, and the induction board and the signal conversion board are arranged at intervals. By adopting the tire balancing machine disclosed by the invention, the working reliability and safety of the tire balancing machine can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire balancing machines. More particularly, the present application relates to a tire balancing machine based on an inductive control module and a control method thereof. BACKGROUND

[0002] Tire balancing machines are often used in scenarios such as automobile maintenance, tire stores, and 4S stores. A tire balancing machine is a professional equipment for detecting and correcting the imbalance of automobile tires and hub assemblies. The main function of a tire balancing machine is to detect the dynamic balance state of the tire during rotation, find the imbalance position, and guide the addition of counterweights to eliminate the imbalance.

[0003] The tire balancing machine in the prior art usually includes a mechanical gate, a mechanical gate switch for detecting the state of the mechanical gate, a tire driving device, a display screen for human-computer interaction, and a control circuit. The control circuit is connected to the mechanical gate switch and controls the tire driving device. The control circuit for controlling the tire balancing machine usually includes a mechanical button and a main control circuit. The main control circuit is connected to the mechanical button and controls the tire driving device of the tire balancing machine. By pressing the mechanical button, a signal instruction is sent to the main control circuit. The main control circuit controls the action of the tire driving device of the tire balancing machine according to the received signal instruction.

[0004] When the action of the tire balancing machine is controlled by the mechanical button, the fingers of the worker need to directly or indirectly contact the mechanical button, which can easily damage the operation panel on the surface of the tire balancing machine, causing the control device of the tire balancing machine to be damaged, and further reducing the reliability and safety of the tire balancing machine. For example, the operator is often in the process of repairing a vehicle, wearing gloves, or having dirty hands, or even holding tools with both hands. At this time, it is possible to directly operate the button with the tools, or to remove the gloves, or to dirty or scratch the surface due to finger contact. In the real environment, the contact button is often prone to damage due to uncontrollable external forces. In addition, mechanical contact can easily cause oxidation and short circuit of the contact, resulting in poor reliability and safety of the tire balancing machine.

[0005] In summary, the tire balancing machine in the prior art has the technical problem of poor reliability and safety. SUMMARY

[0006] To solve the technical problem of poor reliability and safety of the tire balancing machine in the prior art, the present application provides a solution in the following aspects.

[0007] In a first aspect, the present application provides a tire balancing machine based on an inductive control module, characterized in that it comprises: A mechanical gate is used to protect the safety of the site workers; A mechanical gate switch is used to detect the state of the mechanical gate; A tire driving device is used to drive the tire to rotate; A display screen is used for human-computer interaction; A control circuit is connected to the mechanical gate switch and controls the tire driving device to control its working state; the control circuit includes a plurality of capacitive touch sensors for generating a finger proximity signal, wherein different capacitive touch sensors correspond to different action instructions; a touch detection circuit, each input end of which is connected to the front end of each capacitive touch sensor, is used to convert the finger proximity signal generated by the capacitive touch sensor into a stable level signal; A signal conversion circuit, each input end of which is connected to each output end of the touch detection circuit, and each output end of which is connected to a different IO pin of the main control circuit, is used to convert the level signal into a matrix key signal; the signal conversion circuit includes a tri-state buffer, the output enable pin of the tri-state buffer is connected to the output end of the touch detection circuit through an isolation circuit, the output pin of the tri-state buffer is connected to the IO pin of the main control circuit through a zener diode, the anode of the zener diode is connected to the IO pin of the main control circuit, and the cathode is connected to the output pin of the tri-state buffer; the main control circuit is the main control circuit of the tire balancing machine; A main control circuit is used to control the action of the mechanical gate switch and the tire driving device according to the received matrix key signal; A power supply circuit is used to supply power to the touch detection circuit and the isolation circuit; The plurality of capacitive touch sensors and the touch detection circuit are integrated on a sensing board; the signal conversion circuit is integrated on a signal conversion board, and the sensing board and the signal conversion board are arranged in a spaced manner.

[0008] The beneficial effects are that the tire balancing machine of the embodiment replaces the mechanical button in the control circuit with a touch button, thereby avoiding the risk of oxidation and short circuit of the touch point of the button, and improving the safety and reliability of the tire balancing machine; since the level signal generated by the touch detection circuit is easy to be disturbed, the tire balancing machine of the embodiment is provided with the induction plate and the signal conversion plate, thereby playing the role of electrostatic isolation, increasing the anti-interference performance of the entire control circuit, and further improving the safety and reliability of the tire balancing machine; since the IO of the main control circuit directly receives the high-level signal, which may cause the main control circuit to malfunction, by arranging the voltage stabilizing diode, even if the output end of the tri-state buffer is high, the signal received by the IO of the main control circuit is stabilized in the acceptable range through the clamping effect of the voltage stabilizing diode, thereby avoiding the device of the main control circuit from being burned out, and further improving the safety and reliability of the tire balancing machine. In addition, the weak induction signal collected by the capacitive touch sensor is converted into a stable level signal by the touch detection circuit arranged in the control circuit, thereby ensuring that the main control circuit effectively collects the touch signal.

[0009] Preferably, the surface of the induction plate is covered with an insulating elastic plate.

[0010] Preferably, the input pin of the tri-state buffer is connected to the first power supply voltage through a pull-up resistor.

[0011] Preferably, the power supply circuit comprises a DC-DC converter and a linear voltage stabilizer, wherein the input voltage pin of the DC-DC converter is connected to the first power supply voltage through a first inductor, the two ends of the first inductor are respectively connected to the ground through a first filter capacitor and a second filter capacitor, the output voltage pin of the DC-DC converter is connected to the input voltage pin of the linear voltage stabilizer, and the output voltage pin of the linear voltage stabilizer is the output end of the power supply circuit.

[0012] Preferably, the output voltage pin of the DC-DC converter is grounded through a third filter capacitor, and the output voltage pin of the linear voltage stabilizer is grounded through a fourth filter capacitor.

[0013] Preferably, the touch detection circuit is a capacitive touch controller, the touch key input pin of the capacitive touch controller is connected to the front end of the capacitive touch sensor, the touch detection output signal pin thereof is connected to the output enable end of the tri-state buffer through an isolation circuit, the positive power supply pin thereof is connected to the output voltage pin of the linear voltage stabilizer, the negative power supply pin thereof is grounded, and the positive power supply pin thereof is connected to the negative power supply pin thereof through a filter capacitor.

[0014] Preferably, the input end of the signal conversion circuit is connected to the output end of the touch detection circuit through an isolation circuit; the isolation circuit adopts a two-channel digital isolator, the logic input pin of the primary side of the two-channel digital isolator is connected to the touch detection output signal pin of the capacitive touch controller, the logic output pin of the secondary side of the two-channel digital isolator is connected to the output enable end of the tri-state buffer, and the power supply pin of the two-channel digital isolator is connected to the output voltage pin of the linear voltage stabilizer.

[0015] Preferably, the power supply pin of the two-channel digital isolator is grounded through a filtering capacitor.

[0016] In a second aspect, the present application provides a control method of a tire balancing machine, which is used to control the tire balancing machine based on the inductive control module of the present application, comprising: Under the condition that the tire driving device is in a stop state, if a start instruction is received and the mechanical gate is in a closed state, the tire driving device is started; Under the condition that the tire driving device drives the tire to rotate, the interface of the display screen is switched to a rotating speed display interface; during the tire rotation, if a level signal corresponding to another action instruction except the start-stop instruction is generated by the touch detection circuit, the corresponding action is not performed.

[0017] The control method of the tire balancing machine of the present embodiment has the beneficial effect that the rotating speed of the tire balancing machine cannot be changed at will by the operator when the tire balancing machine drives the tire to rotate, thereby ensuring the safety of the tire balancing machine.

[0018] Preferably, the action instructions include a start-stop instruction, a rotating speed increasing instruction, and a rotating speed decreasing instruction; if multiple capacitive touch sensors are triggered at the same time and the capacitive touch sensor corresponding to the start-stop instruction is triggered, the action corresponding to the start-stop instruction is performed; if multiple capacitive touch sensors are triggered at the same time and the capacitive touch sensor corresponding to the start-stop instruction is not triggered, the tire balancing machine is kept in the current working state.

[0019] The beneficial effect is that, in the case that multiple capacitive touch sensors are triggered at the same time, if the capacitive touch sensor corresponding to the start-stop instruction is not triggered, the action instructions corresponding to each triggered capacitive touch sensor are not performed, thereby preventing signal conflicts and ensuring the safety of the tire balancing machine; if the capacitive touch sensor corresponding to the start-stop instruction is triggered, only the start-stop instruction is performed, thereby enabling the on-site operator to control the start and stop of the tire balancing machine in a timely manner and ensuring the safety of the tire balancing machine.

[0020] In summary, the beneficial effect of the present application is that the tire balancing machine based on the inductive control module and the control method thereof can effectively improve the safety and reliability of the tire balancing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 Schematically illustrates the structure of a tire balancing machine based on an inductive control module according to an embodiment of the present invention; Figure 2 is a schematic diagram schematically showing the structure of a control circuit according to an embodiment of the present invention; Figure 3 is a schematic diagram schematically illustrating a signal conversion circuit according to an embodiment of the present invention; Figure 4 is a schematic diagram illustrating a power supply circuit according to an embodiment of the present invention; Figure 5 is a schematic diagram schematically illustrating a capacitive touch controller according to an embodiment of the present invention; Figure 6 Schematic diagram of an isolation circuit according to an embodiment of the present invention DETAILED DESCRIPTION The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0022] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example of a tire balancing machine based on an inductive control module: like Figure 1 As shown, the tire balancing machine based on the inductive control module of the present invention includes: Mechanical gates (not shown) are used to protect the personal safety of on-site workers; Mechanical gate switch 1, used to detect the status of the mechanical gate; Tire driving device 2, used to drive the tire to rotate; Display screen 3, used for human-computer interaction; The control circuit provided on the console 4 is connected to the mechanical gate switch and the tire drive device to control their working state; Figure 2 As shown, the control circuit includes: a plurality of capacitive touch sensors for generating finger proximity signals, wherein different capacitive touch sensors correspond to different action instructions; a touch detection circuit, each input terminal of which is connected to a front end of each capacitive touch sensor, for converting the finger proximity signals generated by the capacitive touch sensors into stable level signals; a signal conversion circuit, each input terminal of which is connected to each output terminal of the touch detection circuit, and each output terminal of which is connected to a different IO pin of the master control circuit, for converting the level signals into matrix key signals; the signal conversion circuit comprises a tri-state buffer, an output enable pin of the tri-state buffer being connected to the output terminal of the touch detection circuit through an isolation circuit, an output pin of the tri-state buffer being connected to the IO pin of the master control circuit through a zener diode, an anode of the zener diode being connected to the IO pin of the master control circuit, and a cathode of the zener diode being connected to the output pin of the tri-state buffer; the master control circuit is a master control circuit of a tire balancing machine; a master control circuit for controlling the actions of the mechanical gate switch and the tire driving device according to the received matrix key signals; a power supply circuit for supplying power to the touch detection circuit and the isolation circuit; wherein the plurality of capacitive touch sensors and the touch detection circuit are integrated on a sensing board; the signal conversion circuit is integrated on a signal conversion board, and the sensing board and the signal conversion board are arranged in a spaced manner.

[0024] In the embodiment, seven capacitive touch sensors are provided, which are respectively a first capacitive touch sensor TK1, a second capacitive touch sensor TK2, a third capacitive touch sensor TK3, a fourth capacitive touch sensor TK4, a fifth capacitive touch sensor TK5, a sixth capacitive touch sensor TK6, and a seventh capacitive touch sensor TK7; wherein different capacitive touch sensors correspond to different action instructions. In other embodiments, the capacitive touch sensors can also be other suitable numbers.

[0025] As Figure 3As shown, the signal conversion circuit in the embodiment is provided with two tri-state buffers, namely a first tri-state buffer U1 and a second tri-state buffer U2. The first output enable pin 10E# and the power supply pin VCC of the first tri-state buffer U1 are both connected to the first power supply voltage VCC. The second output enable pin 20E#, the third output enable pin 30E# and the fourth output enable pin 40E# are all connected to the output end of the touch detection circuit through an isolation circuit. The second output pin 2Y, the third output pin 3Y and the fourth output pin 4Y are respectively connected to the IO pin of the master control circuit through a voltage stabilizing diode (not shown in the figure). The first output enable pin 10E#, the second output enable pin 20E#, the third output enable pin 30E# and the fourth output enable pin 40E# of the second tri-state buffer U2 are all connected to the output end of the touch detection circuit through an isolation circuit. The first output pin 1Y, the second output pin 2Y, the third output pin 3Y and the fourth output pin 4Y are respectively connected to the IO pin of the master control circuit through a voltage stabilizing diode (not shown in the figure).

[0026] In the embodiment, the tri-state buffer is a high-performance CMOS four-way tri-state buffer with a model number of 74HC123.

[0027] The working principle of the tire balancing machine of the embodiment is as follows: First, the tire is installed at the corresponding position of the tire driving device, and then the mechanical gate is closed. After the mechanical gate is closed, the on-site worker touches the corresponding capacitive touch sensor with a finger to generate an action instruction to the master control circuit. The master control circuit controls the action of the tire driving device after receiving the action instruction. Specifically, different capacitive touch sensors correspond to different action instructions. When the operator touches the front end of a capacitive touch sensor with a finger, the capacitive touch sensor generates a weak finger proximity signal. The touch detection circuit converts the weak finger proximity signal into a stable level signal and transmits it to the enable end of the tri-state buffer through an isolation circuit. When the enable end of the tri-state buffer receives the level signal, the output end of the tri-state buffer outputs a low-level signal and transmits it to the corresponding IO pin of the master control circuit. After detecting that the level of a certain IO pin of the master control circuit becomes low, the master control circuit controls the tire balancing machine to perform the corresponding action. The action includes starting and stopping the tire driving device and adjusting the rotation speed.

[0028] The tire balancing machine of the embodiment avoids the risk of oxidation and short circuit of the contact of the mechanical button in the control circuit by replacing the mechanical button with a touch button, thereby improving the safety and reliability of the tire balancing machine; since the level signal generated by the touch detection circuit is susceptible to interference, the tire balancing machine of the embodiment has the induction plate and the signal conversion plate arranged in a spaced manner, thereby playing a role of electrostatic isolation and increasing the anti-interference performance of the entire control circuit, thereby further improving the safety and reliability of the tire balancing machine; since the direct reception of the high-level signal by the IO of the main control circuit may cause the main control circuit to malfunction, by arranging the voltage stabilizing diode, even if the output end of the tri-state buffer is at a high level, the signal received by the IO of the main control circuit can be stabilized within an acceptable range through the clamping action of the voltage stabilizing diode, thereby avoiding the burning of the device of the main control circuit and further improving the safety and reliability of the tire balancing machine. In addition, by arranging the touch detection circuit in the control circuit, the weak induction signal collected by the capacitive touch sensor can be converted into a stable level signal, thereby ensuring that the main control circuit effectively collects the touch signal.

[0029] In one embodiment, the surface of the induction plate is covered with an insulating elastic plate.

[0030] By covering the surface of the induction plate with an insulating elastic plate, the induction plate can have corrosion resistance, static resistance and water resistance, thereby further improving the safety of the tire balancing machine.

[0031] In order to prevent the input pin of the tri-state buffer from being suspended and causing the output of the buffer to be unstable, in one embodiment, the input pin of the tri-state buffer is connected to the first power supply voltage through a pull-up resistor.

[0032] Without pull-up, if the input pin is not connected or the IO is not configured, it may be suspended, causing the buffer output to be unstable. After pull-up, the input end is ensured to be at a high level by default in the absence of input drive.

[0033] As shown in FIG. Figure 4 In one embodiment, the power supply circuit includes a DC-DC converter U4 and a linear voltage stabilizer U8, wherein the input voltage pin +Vin of the DC-DC converter is connected to the first power supply voltage VCC through the first inductor L3, the two ends of the first inductor are respectively connected to the ground through the first filter capacitor C14 and the second filter capacitor C15, the output voltage pin +Vout of the DC-DC converter is connected to the input voltage pin VSS of the linear voltage stabilizer, the output voltage pin VOUT of the linear voltage stabilizer is the output end of the power supply circuit, and the voltage output by the linear voltage stabilizer is the second power supply voltage VCC1.

[0034] The DC-DC converter U4 can be a DC-DC converter of model B0505S-1WR3.

[0035] In order to make the voltage output by the DC-DC converter and the voltage output by the linear voltage stabilizer more stable, in an embodiment, the output voltage pin of the DC-DC converter is grounded through a third filter capacitor C16, and the output voltage pin of the linear voltage stabilizer is grounded through a fourth filter capacitor C18.

[0036] In an embodiment, the touch detection circuit is a capacitive touch controller, the touch key input pin of the capacitive touch controller is connected to the front end of the capacitive touch sensor, the touch detection output signal pin of the capacitive touch controller is connected to the output enable end of the tri-state buffer through an isolation circuit, the positive power supply pin of the capacitive touch controller is connected to the output voltage pin of the linear voltage stabilizer, and the negative power supply pin of the capacitive touch controller is grounded, and the positive power supply pin of the capacitive touch controller is connected to the negative power supply pin of the capacitive touch controller through a filter capacitor.

[0037] In the embodiment, as shown in Figure 5 In the embodiment, as shown in

[0038] The first touch key input pin KEY1 of the second capacitive touch controller U10 is connected to the front end of the first capacitive touch sensor TK1, the second touch key input pin KEY2 is connected to the front end of the third capacitive touch sensor TK3, the fourth touch key input pin KEY4 is connected to the front end of the second capacitive touch sensor TK2, the positive power supply pin VDD is connected to the output voltage pin VOUT of the linear voltage stabilizer, the negative power supply pin VSS is grounded, and the positive power supply pin VDD is connected to the negative power supply pin VSS through a filter capacitor C11.

[0039] The capacitive touch sensor is of model BS814C-1-10MSOP.

[0040] The input end of the signal conversion circuit is connected to the output end of the touch detection circuit through an isolation circuit; the isolation circuit adopts a dual-channel digital isolator, a logic input pin of a primary side of the dual-channel digital isolator is connected to a touch detection output signal pin of the capacitive touch controller, a logic output pin of a secondary side of the dual-channel digital isolator is connected to an output enable end of the tri-state buffer, and a power supply pin of the dual-channel digital isolator is connected to an output voltage pin of the linear voltage stabilizer.

[0041] As shown in the drawings, Figure 6 In the embodiment, four dual-channel digital isolators are provided, which are a first dual-channel digital isolator U3, a second dual-channel digital isolator U5, a third dual-channel digital isolator U6 and a fourth dual-channel digital isolator U7; a second logic input pin VIB of the primary side of the first dual-channel digital isolator U3 is connected to a first touch detection output pin Kout1 of the second capacitive touch controller U10, and a second logic output pin VOB of the secondary side of the first dual-channel digital isolator U3 is connected to a fourth output enable pin 40E# of the first tri-state buffer U1.

[0042] A first logic input pin VIA of the primary side of the second dual-channel digital isolator U5 is connected to a second touch detection output pin Kout2 of the second capacitive touch controller U10, and a second logic input pin VIB of the primary side of the second dual-channel digital isolator U5 is connected to a fourth touch detection output pin Kout4 of the second capacitive touch controller U10; a first logic output pin VOA of the secondary side of the second dual-channel digital isolator U5 is connected to a second output enable pin 20E# of the first tri-state buffer U1, and a second logic output pin VOB of the secondary side of the second dual-channel digital isolator U5 is connected to a third output enable pin 30E# of the first tri-state buffer U1.

[0043] A first logic input pin VIA of the primary side of the third dual-channel digital isolator U6 is connected to a first touch detection output pin Kout1 of the first capacitive touch controller U11, and a second logic input pin VIB of the primary side of the third dual-channel digital isolator U6 is connected to a second touch detection output pin Kout2 of the first capacitive touch controller U11; a first logic output pin VOA of the secondary side of the third dual-channel digital isolator U6 is connected to a fourth output enable pin 40E# of the second tri-state buffer U2, and a second logic output pin VOB of the secondary side of the third dual-channel digital isolator U6 is connected to a third output enable pin 30E# of the second tri-state buffer U2.

[0044] The first logic input pin VIA of the fourth dual-channel digital isolator U7 is connected to the third touch detection output pin Kout3 of the first capacitive touch controller U11, and the second logic input pin VIB of the primary side is connected to the fourth touch detection output pin Kout4 of the first capacitive touch controller U11; the first logic output pin VOA of the secondary side is connected to the first output enable pin 10E# of the second tri-state buffer U2, and the second logic output pin VOB of the secondary side is connected to the second output enable pin 20E# of the second tri-state buffer U2.

[0045] The power supply end of the primary side of the first dual-channel digital isolator U3, the second dual-channel digital isolator U5, the third dual-channel digital isolator U6 and the fourth dual-channel digital isolator U7 is connected to the output voltage pin VOUT of the linear voltage stabilizer, and the power supply end of the secondary side is connected to the first power supply voltage VCC.

[0046] The dual-channel digital isolator can adopt a dual-channel digital isolator with a model number of π120U31.

[0047] In order to make the operation of the dual-channel digital isolator more stable, in an embodiment, the power supply pin of the dual-channel digital isolator is grounded through a filtering capacitor. The application also provides a control method of a tire balancing machine, which is used for controlling the tire balancing machine based on the inductive control module in the above embodiment, and the control method comprises the following steps of: Under the condition that the tire driving device is in a stop state, if a start instruction is received and the mechanical gate is in a closed state, the tire driving device is started; Under the condition that the tire driving device drives the tire to rotate, the interface of the display screen is switched to a rotating speed display interface; during the tire rotation, if a level signal corresponding to other action instructions of the touch detection circuit is generated, the corresponding action is not performed.

[0048] As shown in the following table, in the embodiment, the tire rotation signal can be collected by the Hall sensor, and the I / O state of the tire rotation signal is set to be enabled; if the tire rotation signal is collected and the action instruction corresponding to the first capacitive touch sensor is the start-stop instruction, only the I / O state of the first capacitive touch sensor is set to be readable, and the I / O state of the other capacitive touch sensors is set to be prohibited to input.

[0049] Table 1

[0050] The control method of the tire balancing machine in the embodiment can ensure that the operator cannot arbitrarily change the rotating speed when the tire balancing machine drives the tire to rotate, thereby ensuring the safety of the operation of the tire balancing machine.

[0051] In one embodiment, the action instructions include start-stop instructions, rotation speed increase instructions, and rotation speed decrease instructions; if multiple capacitive touch sensors are triggered at the same time and the capacitive touch sensor corresponding to the start-stop instructions is triggered, the action corresponding to the start-stop instructions is executed; if multiple capacitive touch sensors are triggered at the same time and the capacitive touch sensor corresponding to the start-stop instructions is not triggered, the tire balancing machine keeps the current working state.

[0052] In the case that multiple capacitive touch sensors are triggered at the same time, if the capacitive touch sensor corresponding to the start-stop instructions is not triggered, the action instructions corresponding to each triggered capacitive touch sensor are not executed, thereby preventing signal conflicts and ensuring the safety of the tire balancing machine; if the capacitive touch sensor corresponding to the start-stop instructions is triggered, only the start-stop instructions are executed, thereby ensuring that the on-site operator can control the start and stop of the tire balancing machine in a timely manner and ensuring the safety of the tire balancing machine.

[0053] Although the present specification has shown and described several embodiments of the present application, it is to be understood that for the accomplishment of the present invention, numerous modifications, changes and substitutions can be resorted to by those skilled in the art without departing from the spirit and scope of the present application. It is understood that various alternatives to the embodiments of the application described herein can be employed in practicing the present application.

Claims

1. A tire balancing machine based on an inductive control module, characterized in that: include: Mechanical gates are used to protect the personal safety of on-site workers; Mechanical gate switch, used to detect the status of the mechanical gate; A tire driving device, used to drive the tire to rotate; Display screen for human-computer interaction; A control circuit, which is connected to the mechanical gate switch and is controlled by the tire drive device to control its working state; the control circuit includes multiple capacitive touch sensors for generating finger proximity signals, where different capacitive touch sensors correspond to different action instructions; a touch detection circuit, each input end of which is connected to the front end of each capacitive touch sensor, is used to convert the finger proximity signal generated by the capacitive touch sensor into a stable level signal; A signal conversion circuit, each input end of which is respectively connected to each output end of the touch detection circuit, and each output end of which is respectively connected to a different IO pin of the main control circuit, for converting the level signal into a matrix key signal; the signal conversion circuit includes a three-state buffer, the output enable pin of the three-state buffer is connected to the output end of the touch detection circuit via an isolation circuit, the output pin of the three-state buffer is connected to the IO pin of the main control circuit via a Zener diode, the anode of the Zener diode is connected to the IO pin of the main control circuit, and the cathode is connected to the output pin of the three-state buffer; the main control circuit is the main control circuit of the tire balancer; The main control circuit is used to control the operation of the mechanical gate switch and the tire drive device according to the received matrix key signal; a power supply circuit, configured to supply power to the touch detection circuit and the isolation circuit; Wherein, a plurality of capacitive touch sensors and a touch detection circuit are integrated on the sensing board; a signal conversion circuit is integrated on the signal conversion board, and the sensing board and the signal conversion board are spaced apart.

2. The tire balancing machine based on the inductive control module according to claim 1, characterized in that: The surface of the induction plate is covered with an insulating elastic plate.

3. The tire balancing machine based on the inductive control module according to claim 1, characterized in that: An input pin of the tri-state buffer is connected to a first power supply voltage through a pull-up resistor.

4. The tire balancing machine based on the inductive control module according to any one of claims 1 to 3, characterized in that: The power supply circuit includes a DC-DC converter and a linear regulator, wherein the input voltage pin of the DC-DC converter is connected to the first supply voltage through a first inductor, the two ends of the first inductor are grounded through a first filter capacitor and a second filter capacitor respectively, the output voltage pin of the DC-DC converter is connected to the input voltage pin of the linear regulator, and the output voltage pin of the linear regulator is the output end of the power supply circuit.

5. The tire balancing machine based on the inductive control module according to claim 4, characterized in that: The output voltage pin of the DC-DC converter is grounded through a third filter capacitor, and the output voltage pin of the linear regulator is grounded through a fourth filter capacitor.

6. The tire balancing machine based on the inductive control module according to claim 4, characterized in that: The touch detection circuit is a capacitive touch controller, the touch key input pin of the capacitive touch controller is connected to the front end of the capacitive touch sensor, its touch detection output signal pin is connected to the output enable terminal of the three-state buffer through an isolation circuit, its positive power supply pin is connected to the output voltage pin of the linear regulator, its negative power supply pin is grounded, and its positive power supply pin is connected to its negative power supply pin through a filter capacitor.

7. The tire balancing machine based on the inductive control module according to claim 6, characterized in that: The input end of the signal conversion circuit is connected to the output end of the touch detection circuit through an isolation circuit; the isolation circuit uses a dual-channel digital isolator, the logic input pin of the primary side of the dual-channel digital isolator is connected to the touch detection output signal pin of the capacitive touch controller, the logic output pin of the secondary side of the dual-channel digital isolator is connected to the output enable end of the three-state buffer, and the power supply pin of the dual-channel digital isolator is connected to the output voltage pin of the linear regulator.

8. The tire balancing machine based on the inductive control module according to claim 7, characterized in that: The power supply pin of the dual-channel digital isolator is grounded through a filter capacitor.

9. A control method for a tire balancing machine, characterized in that: The control method is used to control the tire balancing machine based on the inductive control module according to any one of claims 1 to 8, comprising: When the tire drive device is in a stopped state, if a start command is received and the mechanical gate is in a closed state, the tire drive device is started; When the tire drive device drives the tire to rotate, the display screen interface is switched to the speed display interface; during the tire rotation process, if the touch detection circuit generates a level signal corresponding to an action instruction other than the start-stop instruction, the corresponding action is not performed.

10. The control method of the tire balancing machine according to claim 9, wherein: The action instructions include a start-stop instruction, a speed increase instruction, and a speed decrease instruction; if multiple capacitive touch sensors are triggered at the same time and the capacitive touch sensor corresponding to the start-stop instruction is triggered, the action corresponding to the start-stop instruction is executed; If the plurality of capacitive touch sensors are triggered simultaneously and the capacitive touch sensor corresponding to the start / stop command is not triggered, the wheel balancing machine is kept in the current working state.

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