Sealing machine and vacuumizing control circuit thereof

Abstract

The utility model provides a sealing machine and a vacuumizing control circuit thereof, when a controller receives an external vacuumizing starting signal, a high level signal is output to a driving circuit, so that the driving circuit is in a conducting state, a vacuumizing motor starts to operate, and the driving circuit is switched on along with the proceeding of vacuumizing. The current value for driving the vacuumizing motor also changes and is fed back to the controller through the sampling circuit and the filter circuit, and when the controller judges that the current value flowing through the vacuumizing motor is lower than a preset value, the driving circuit is controlled to be in a disconnected state, the vacuumizing motor stops running, and the vacuumizing motor stops running. The problem that an existing sealing machine cannot correctly detect and feed back the air pressure state is solved.

Description

Technical Field

[0001] The utility model relates to the field of automatic control, and in particular to a sealing machine and a vacuum pumping control circuit thereof. Background Art

[0002] The common air pressure detection scheme of the sealing machine usually uses an air pressure switch for detection. The air pressure switch monitors the pressure through its internal pressure detection device by short-circuiting or disconnecting the physical structure. Specifically, when the sealing machine is running, if the internal air pressure reaches or exceeds the set value, the detection device of the air pressure switch will be triggered, and the signal will be fed back to the control system, thereby adjusting or stopping the operation of the machine to ensure the quality and safety of the sealing.

[0003] There are certain defects in the use of air pressure switches. Especially in the process of wet extraction and sealing, since the machine needs to extract air and seal at the same time, the humidity in the sealing area is high, and some moisture often enters the inside of the air pressure switch. After long-term use, the accumulation of moisture causes the air pressure switch to completely fail, unable to correctly detect and feedback the air pressure status, which in turn leads to incomplete sealing or loose sealing, affecting product quality.

[0004] In view of this, this application is filed. Utility Model Content

[0005] The utility model discloses a sealing machine and a vacuum pumping control circuit thereof, aiming to solve the problem that the existing sealing machine cannot correctly detect and feed back the air pressure state.

[0006] The first embodiment of the utility model provides a vacuum control circuit for a sealing machine, comprising: a controller, a driving circuit, a sampling circuit, a filtering circuit, and an anti-reversal circuit;

[0007] The output end of the controller is electrically connected to the control end of the drive circuit, the power supply is electrically connected to the input end of the drive circuit through the anti-reversal circuit, the output end of the drive circuit is electrically connected to the sampling circuit, the sampling circuit is electrically connected to the input end of the controller through the filter circuit, and the vacuum motor is connected in parallel to the anti-reversal circuit;

[0008] Wherein, the driving circuit is configured to switch between an on state and an off state. In the on state, the vacuum motor works, and in the off state, the vacuum motor stops.

[0009] Preferably, the driving circuit comprises: a first resistor, a second resistor, and a MOS tube;

[0010] Among them, the output end of the controller is electrically connected to the G pole of the MOS tube through the first resistor, the G pole of the MOS tube is grounded through the second resistor, the D pole of the MOS tube is connected to the power supply through the anti-reversal circuit, and the S pole of the MOS tube is grounded through the sampling circuit.

[0011] Preferably, the anti-reversal circuit comprises: a diode;

[0012] The D pole of the MOS tube is electrically connected to the positive pole of the diode, the negative pole of the diode is connected to a power supply, and the vacuum pumping motor is connected in parallel to both ends of the diode.

[0013] Preferably, the sampling circuit comprises: a third resistor and a fourth resistor;

[0014] The S pole of the MOS tube is grounded through the third resistor, and the fourth resistor is connected in parallel to both ends of the third resistor.

[0015] Preferably, the filtering circuit comprises: a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor;

[0016] Among them, the S pole of the MOS tube is electrically connected to the first end of the fifth resistor, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the sixth resistor is electrically connected to the input end of the controller, the second end of the fifth resistor is grounded through the first capacitor, and the second end of the sixth resistor is grounded through the second capacitor.

[0017] The second embodiment of the utility model provides a sealing machine, comprising: a power supply, a vacuum motor, a button, and a vacuum control circuit of a sealing machine as described in any one of the above;

[0018] The button is electrically connected to the input end of the controller, the power supply is configured to supply power to the peripheral vacuum motor and the controller, and the vacuum motor is configured on the anti-reversal circuit.

[0019] Based on a sealing machine and a vacuum control circuit thereof provided by the utility model, when the controller receives an external vacuum start signal, it outputs a high-level signal to the drive circuit, so that the drive circuit is in a conducting state, and the vacuum motor starts to run. As the vacuum is carried out, the current value driving the vacuum motor also changes accordingly, and is fed back to the controller through a sampling circuit and a filtering circuit. When the controller determines that the current value flowing through the vacuum motor is lower than a preset value, the drive circuit is controlled to be in a disconnected state, and the vacuum motor stops running, thereby solving the problem that the existing sealing machine cannot correctly detect and feedback the air pressure state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a vacuum control circuit of a sealing machine according to the utility model; DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

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

[0023] The utility model discloses a sealing machine and a vacuum pumping control circuit thereof, aiming to solve the problem that the existing sealing machine cannot correctly detect and feed back the air pressure state.

[0024] See also Figure 1 The first embodiment of the utility model provides a vacuum control circuit for a sealing machine, comprising: a controller, a driving circuit 2, a sampling circuit 3, a filtering circuit 4, and an anti-reversal circuit 1;

[0025] The output end of the controller is electrically connected to the control end of the drive circuit 2, the power supply is electrically connected to the input end of the drive circuit 2 through the anti-reversal circuit 1, the output end of the drive circuit 2 is electrically connected to the sampling circuit 3, the sampling circuit 3 is electrically connected to the input end of the controller through the filter circuit 4, and the vacuum motor is connected in parallel to the anti-reversal circuit 1;

[0026] The driving circuit 2 is configured to switch between an on state and an off state. In the on state, the vacuum motor works, and in the off state, the vacuum motor stops.

[0027] It should be noted that the inventors have found that the presence of moisture in a sealing machine based on an air pressure switch will interfere with the normal detection function of the air pressure switch, resulting in misjudgment of the air pressure state. For example, the air pressure switch may be triggered when the actual air pressure does not reach the set value, or may fail to be triggered in time when the air pressure exceeds the safe range. This will cause the sealing machine to stop or start frequently, affecting production efficiency.

[0028] In this embodiment, the controller can be a single-chip microcomputer controller, which can be but not limited to a single-chip microcomputer of the STM32 series. It has an ADC module that can convert analog quantities into digital quantities. The input end of the controller can be externally connected to a key module for human-computer interaction with the controller. Of course, it can also be a device such as a touch screen. When receiving a start signal, the controller can output a high-level signal to the control end of the drive circuit 2 through the IO port to turn on the drive circuit 2, so that the vacuum motor and the power supply form a loop to start vacuuming. During the vacuuming process, as the air pressure changes, the current flowing through the vacuum motor also changes. It is converted into a voltage signal through the sampling circuit 3, and then fed back to the controller after being processed by the filter circuit 4. When the controller determines that the voltage signal is less than a preset value, it outputs a low-level signal to the control end of the drive circuit 2 through the IO port to automatically control the vacuum motor to shut down.

[0029] In a possible embodiment of the present utility model, the driving circuit 2 includes: a first resistor R1, a second resistor R2, and a MOS tube Q1;

[0030] Among them, the output end of the controller is electrically connected to the G pole of the MOS tube Q1 through the first resistor R1, the G pole of the MOS tube Q1 is grounded through the second resistor R2, the D pole of the MOS tube Q1 is connected to the power supply through the anti-reversal circuit 1, and the S pole of the MOS tube Q1 is grounded through the sampling circuit 3.

[0031] It should be noted that the first resistor R1 and the second resistor R2 are used to control the G pole (gate) voltage of the MOS tube Q1, which can prevent excessive current from impacting the MOS tube Q1, thereby extending the service life of the MOS tube Q1 and increasing the stability and reliability of the circuit. By appropriately selecting the resistance value of the first resistor R1 to be 1k, the resistance value of the second resistor R2 to be 10k, the switching speed of the MOS tube Q1 is optimized, so that it can quickly switch between the on and off states.

[0032] In a possible embodiment of the present utility model, the anti-reversal circuit 1 includes: a diode D1;

[0033] The D pole of the MOS tube Q1 is electrically connected to the positive pole of the diode D1 , the negative pole of the diode D1 is connected to a power source, and the vacuum pumping motor is connected in parallel to both ends of the diode D1 .

[0034] It should be noted that the main function of the diode D1 is to allow current to flow in one direction only. When the MOS tube Q1 is turned on, the current flows from the power supply to the vacuum motor, and the presence of the diode D1 ensures that any possible reverse current will not pass through the MOS tube Q1, thereby protecting other components in the circuit from damage by the reverse current. Based on the anti-reversal circuit 1, the sealing machine can better adapt to different power supply conditions and can work normally even when the power supply quality is not high. The protective effect of the diode D1 ensures that power supply fluctuations or short-term power reverse connection will not have a serious impact on the entire system.

[0035] In a possible embodiment of the present utility model, the sampling circuit 3 includes: a third resistor R3 and a fourth resistor R4;

[0036] The S pole of the MOS tube Q1 is grounded through the third resistor R3 , and the fourth resistor R4 is connected in parallel to both ends of the third resistor R3 .

[0037] It should be noted that by connecting the third resistor R3 in series between the source and ground of the MOS tube Q1, the current passing through the MOS tube Q1 can be accurately sampled. The voltage drop across the third resistor R3 is proportional to the current passing through the MOS tube Q1, allowing accurate measurement of the current, thereby achieving accurate control of the vacuum motor. The fourth resistor R4 is connected in parallel to both ends of the third resistor R3, which can provide a stable voltage reference, help filter out noise and interference in the circuit, and ensure the stability and accuracy of the sampling signal. Furthermore, the third resistor R3 plays a current limiting role in the current path, avoiding instantaneous current shocks, and protecting the MOS tube Q1 and other circuit components from the influence of excessive current.

[0038] In a possible embodiment of the present utility model, the filter circuit 4 includes: a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second capacitor C2;

[0039] Among them, the S pole of the MOS tube Q1 is electrically connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is electrically connected to the input end of the controller, the second end of the fifth resistor R5 is grounded through the first capacitor C1, and the second end of the sixth resistor R6 is grounded through the second capacitor C2.

[0040] It should be noted that the combination of the fifth resistor R5 and the sixth resistor R6 and the first capacitor C1 and the second capacitor C2 forms a low-pass filter, which can effectively filter out high-frequency noise and electromagnetic interference in the circuit, ensure that the signal received by the controller is purer and more stable, and improve the system's anti-interference ability and reliability.

[0041] The second embodiment of the utility model provides a sealing machine, comprising: a power supply, a vacuum motor, a button, and a vacuum control circuit of a sealing machine as described in any one of the above;

[0042] The button is electrically connected to the input end of the controller, the power supply is configured to supply power to the peripheral vacuum motor and the controller, and the vacuum motor is configured on the anti-reversal circuit.

[0043] Based on a sealing machine and a vacuum control circuit thereof provided by the utility model, when the controller receives an external vacuum start signal, it outputs a high-level signal to the drive circuit, so that the drive circuit is in a conducting state, and the vacuum motor starts to run. As the vacuum is carried out, the current value driving the vacuum motor also changes accordingly, and is fed back to the controller through a sampling circuit and a filtering circuit. When the controller determines that the current value flowing through the vacuum motor is lower than a preset value, the drive circuit is controlled to be in a disconnected state, and the vacuum motor stops running, thereby solving the problem that the existing sealing machine cannot correctly detect and feedback the air pressure state.

[0044] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

Claims

1. A vacuum control circuit for a sealing machine, characterized in that: include: Controller, drive circuit, sampling circuit, filter circuit, and anti-reversal circuit; The output end of the controller is electrically connected to the control end of the drive circuit, the power supply is electrically connected to the input end of the drive circuit through the anti-reversal circuit, the output end of the drive circuit is electrically connected to the sampling circuit, the sampling circuit is electrically connected to the input end of the controller through the filter circuit, and the vacuum motor is connected in parallel to the anti-reversal circuit; Wherein, the driving circuit is configured to switch between an on state and an off state. In the on state, the vacuum motor works, and in the off state, the vacuum motor stops.

2. A vacuum control circuit for a sealing machine according to claim 1, characterized in that: The driving circuit comprises: a first resistor, a second resistor, and a MOS tube; Among them, the output end of the controller is electrically connected to the G pole of the MOS tube through the first resistor, the G pole of the MOS tube is grounded through the second resistor, the D pole of the MOS tube is connected to the power supply through the anti-reversal circuit, and the S pole of the MOS tube is grounded through the sampling circuit.

3. A vacuum control circuit for a sealing machine according to claim 2, characterized in that: The anti-reversal circuit comprises: a diode; The D pole of the MOS tube is electrically connected to the positive pole of the diode, the negative pole of the diode is connected to a power supply, and the vacuum pumping motor is connected in parallel to both ends of the diode.

4. A vacuum control circuit for a sealing machine according to claim 3, characterized in that: The sampling circuit comprises: a third resistor and a fourth resistor; The S pole of the MOS tube is grounded through the third resistor, and the fourth resistor is connected in parallel to both ends of the third resistor.

5. A vacuum control circuit for a sealing machine according to claim 4, characterized in that: The filter circuit comprises: a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor; Among them, the S pole of the MOS tube is electrically connected to the first end of the fifth resistor, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the sixth resistor is electrically connected to the input end of the controller, the second end of the fifth resistor is grounded through the first capacitor, and the second end of the sixth resistor is grounded through the second capacitor.

6. A sealing machine, characterized in that: include: A power supply, a vacuum motor, a button, and a vacuum control circuit of a sealing machine as claimed in any one of claims 1 to 5; The button is electrically connected to the input end of the controller, the power supply is configured to supply power to the vacuum motor and the controller, and the vacuum motor is configured on the anti-reversal circuit.

Images