Hot riveting machine power supply protection circuit and hot riveting machine

Abstract

The utility model discloses a hot riveting machine power supply protection circuit and a hot riveting machine so as to improve the reliability of power supply protection. The protection circuit comprises a current conversion unit which is used for converting the current of a power supply loop of the hot riveting machine and outputting the converted current; the voltage conversion unit is used for converting the voltage of the power supply loop of the hot riveting machine and outputting converted voltage; the electric energy metering unit is used for receiving the conversion current from the current conversion unit and the conversion voltage from the voltage conversion unit and acquiring power of a power supply; the control unit is at least used for receiving the power supply power from the electric energy metering unit and outputting a control signal for cutting off power supply when the power supply power exceeds a power threshold value; and the switch unit is also used for receiving a control signal from the control unit, and when the control signal is the control signal for cutting off the power supply, the switch unit cuts off the connection between the hot riveting machine power supply and the external power supply.

Description

Technical Field

[0001] This utility model belongs to the field of electronic technology, specifically, it relates to the power protection circuit of a hot riveting machine and the hot riveting machine itself. Background Technology

[0002] A hot riveting machine is a device that rivets rivets or other riveting materials by heating them. It is widely used in the automotive, metal processing, aerospace, and other technical fields. The power supply for a hot riveting machine controls the temperature of the rivet gun's pressure head to melt the rivets and other riveting materials. Working in conjunction with the machine's mechanical transmission structure, it enables an automated hot riveting process. The main controller in the power supply controls the power to the heating element inside the rivet gun based on the temperature of the pressure head, thus controlling the temperature of the pressure head. Because hot riveting machines operate at high temperatures, a power supply malfunction during operation can not only damage the riveting materials but also easily cause fires or explosions. Therefore, the protection of the hot riveting machine's power supply is crucial.

[0003] In related technologies, the power supply of a hot riveting machine employs a software-based protection method. The main controller in the power supply collects the real-time temperature of the riveting gun's pressure head and determines whether the temperature is abnormal through software. If an abnormality is detected, the main controller sends a control signal to cut off its power supply, thus protecting the hot riveting machine power supply. However, this software-based power protection method suffers from low reliability because the software program needs to run on the main controller, and the main controller's power supply also needs to be controlled by the main controller. If the main controller malfunctions or malfunctions, causing software failure and / or power supply control failure, the hot riveting machine power supply cannot be protected. Summary of the Invention

[0004] One of the objectives of this utility model is to provide a power protection circuit for a hot riveting machine, thereby improving the reliability of power protection.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A power supply protection circuit for a hot riveting machine, wherein the power supply for the hot riveting machine includes a main controller, and the protection circuit includes:

[0007] The current conversion unit is used to convert the current in the power supply circuit of the hot riveting machine and output the converted current.

[0008] The voltage conversion unit is used to convert the voltage of the power supply circuit of the hot riveting machine and output the converted voltage;

[0009] An energy metering unit is used to receive the converted current from the current conversion unit and the converted voltage from the voltage conversion unit, and to obtain the power supply based on the converted current and the converted voltage.

[0010] The control unit is configured to receive the power supply from the power metering unit and output a control signal to cut off the power supply when the power supply exceeds a power threshold.

[0011] A switching unit is configured to be located between the power supply of the hot riveting machine and the external power supply, and is also configured to receive a control signal from the control unit. When the control signal is the control signal for cutting off the power supply, the switching unit disconnects the power supply of the hot riveting machine from the external power supply.

[0012] In some embodiments of this application, the switching unit is a relay;

[0013] The protection circuit also includes:

[0014] The drive circuit unit is used to drive the control signal received from the control unit and transmit the driven control signal to the control terminal of the relay.

[0015] In some embodiments of this application, the protection circuit further includes:

[0016] A heartbeat signal receiving unit is used to receive the heartbeat signal from the main controller;

[0017] The control unit is also configured to connect to the heartbeat signal receiving unit and output the power cut-off control signal when the heartbeat signal receiving unit does not receive the heartbeat signal.

[0018] In some embodiments of this application, the protection circuit further includes:

[0019] A temperature signal receiving unit is used to receive temperature signals from the main controller;

[0020] The control unit is also configured to connect to the temperature signal receiving unit, receive the temperature signal from the temperature signal receiving unit, and output the power cut-off control signal when the temperature corresponding to the temperature signal exceeds the temperature threshold.

[0021] Another objective of this utility model is to provide a hot riveting machine with high power supply protection reliability. The hot riveting machine includes a hot riveting machine power supply, the hot riveting machine power supply includes a main controller, and the hot riveting machine also includes the aforementioned hot riveting machine power supply protection circuit.

[0022] Compared with the prior art, the advantages and positive effects of this utility model are:

[0023] The power protection circuit and hot riveting machine provided by this utility model constitute a hardware power protection circuit by setting up a current conversion unit, a voltage conversion unit, an energy metering unit, a control unit, and a switching unit. The control unit can obtain the instantaneous power of the power supply through the current conversion unit, voltage conversion unit, and energy metering unit. When the power supply exceeds the power threshold, it determines that the power system is abnormal and sends a control signal to the switching unit to cut off the power supply. The switching unit will disconnect the power supply from the external power supply to achieve the purpose of protecting the power supply. The power protection circuit of the hot riveting machine provided by this utility model can be set independently of the power supply main controller, which is convenient for configuring hot riveting machines that have already left the factory and improves the application scenarios of the protection circuit. Moreover, the protection circuit protects the power supply in the form of a hardware structure, which improves the reliability of the power protection of the hot riveting machine.

[0024] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural block diagram of the first embodiment of the power protection circuit for the hot riveting machine of this utility model;

[0027] Figure 2 This is a structural block diagram of the second embodiment of the power protection circuit for the hot riveting machine of this utility model;

[0028] Figure 3 This is a circuit diagram of the third embodiment of the power protection circuit for the hot riveting machine of this utility model;

[0029] Figure 4 This is a circuit diagram of the fourth embodiment of the power protection circuit for the hot riveting machine of this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0032] Figure 1 The diagram shown is a structural block diagram of the first embodiment of the power supply protection circuit for the hot riveting machine of this utility model. The protection circuit of this embodiment is used to protect the power supply 3 of the hot riveting machine.

[0033] like Figure 1 As shown, the protection circuit of this embodiment includes a current conversion unit 11, a voltage conversion unit 12, an energy metering unit 13, a control unit 14, and a switching unit 15.

[0034] The current conversion unit 11 and voltage conversion unit 12 are used to convert the current and voltage of the circuit of the hot riveting machine power supply 3 used by the protection circuit, respectively. This embodiment does not limit the specific structural form of the current conversion unit 11 and voltage conversion unit 12; any structure capable of converting the current and voltage of the power supply circuit into small current and small voltage suitable for the chip structure is acceptable. For example, in some embodiments, the current conversion unit 11 is implemented using a current transformer structure, and the voltage conversion unit 12 is implemented using a voltage transformer structure.

[0035] The power metering unit 13 is used to receive the converted current from the current conversion unit 11 and the converted voltage from the voltage conversion unit 12, and to obtain the power supply of the hot riveting machine power supply 3 based on the converted current and the converted voltage. The method of obtaining power based on the converted current and the converted voltage can be implemented using existing technology, and this embodiment is not limited to this.

[0036] The control unit 14, as the control core of the protection circuit in this embodiment, is used to receive the power obtained from the power metering unit 13 and output a control signal to cut off the power supply when the power exceeds a power threshold. The specific implementation of the control unit 14 comparing the received power with the set power threshold and outputting the set control signal when the power exceeds the power threshold can employ existing technology, and this embodiment does not limit this aspect.

[0037] A switching unit 15 is disposed between the power supply 3 of the riveting machine to be protected and the external power supply. It is used to receive control signals from the control unit 14, and when the control signal is a power cut-off control signal, the switching unit 15 operates to disconnect the connection between the power supply 3 of the riveting machine and the external power supply. This embodiment does not limit the specific structural form of the switching unit 15, as long as it can perform switching operations according to the control signals received from the control unit 14 to disconnect or maintain the connection between the power supply of the riveting machine and the external power supply.

[0038] It should be understood that in some other embodiments, if the power from the power metering unit 13 does not exceed the power threshold, the control unit 14 does not output a control signal to cut off the power supply, and the switching unit 15 will not cut off the connection between the hot riveting machine power supply 3 and the external power supply, but will maintain the connection between the hot riveting machine power supply 3 and the external power supply.

[0039] The protection circuit in the above embodiment utilizes a current conversion unit 11, a voltage conversion unit 12, an energy metering unit 13, a control unit 14, and a switching unit 15 to form a hardware power protection circuit. The control unit 14 can obtain the instantaneous power of the power supply through the current conversion unit 11, the voltage conversion unit 12, and the energy metering unit 13. When the power supply exceeds the power threshold, it determines that the power system is abnormal and sends a control signal to the switching unit 15 to cut off the power supply. The switching unit 15 will disconnect the power supply from the external power supply, preventing the power supply from continuously outputting electrical energy and causing damage, thus achieving the purpose of protecting the power supply. Moreover, the protection circuit protects the power supply in the form of a hardware structure, improving the reliability of the power supply protection for the hot riveting machine. In addition, the protection circuit of this embodiment can be set independently of the main controller of the hot riveting machine power supply 3, making it convenient to configure the protection circuit separately for hot riveting machines that have already left the factory, thus expanding the application scenarios of the protection circuit.

[0040] In some other embodiments, the switching unit in the power protection circuit is implemented using a relay. In this embodiment, to enhance the driving capability of the control signal, the protection circuit also includes a driving circuit unit for driving the control signal received from the self-control unit and transmitting the driven control signal to the control terminal of the relay to control the relay to perform switching actions according to the control signal.

[0041] Figure 2 A structural block diagram of a second embodiment of the power supply protection circuit for the hot riveting machine of this utility model is shown. This embodiment's protection circuit is used to protect the power supply 4 of the hot riveting machine.

[0042] like Figure 2 As shown, the protection circuit of this embodiment includes a current conversion unit 21, a voltage conversion unit 22, an energy metering unit 23, a heartbeat signal receiving unit 24, a temperature signal receiving unit 25, a control unit 26, and a switching unit 27.

[0043] The current conversion unit 21 and voltage conversion unit 22 are used to convert the current and voltage of the circuit of the hot riveting machine power supply 4 used by the protection circuit, respectively. This embodiment does not limit the specific structural form of the current conversion unit 21 and voltage conversion unit 22, as long as they can convert the current and voltage of the power supply circuit into small current and small voltage suitable for the chip structure. For example, in some embodiments, the current conversion unit 21 is implemented using a current transformer structure, and the voltage conversion unit 22 is implemented using a voltage transformer structure. The power metering unit 23 is used to receive the converted current from the current conversion unit 21 and the converted voltage from the voltage conversion unit 22, and obtain the power supply power of the hot riveting machine power supply 4 based on the converted current and converted voltage. The method of obtaining power based on the converted current and converted voltage can be implemented using existing technology, and this embodiment does not limit this.

[0044] Control unit 26, as the control core of the protection circuit in this embodiment, is at least used to receive the power obtained from the power metering unit 23 and output a control signal to cut off the power supply when the power exceeds a power threshold. The specific implementation of control unit 24 comparing the received power with the set power threshold and outputting a set control signal when the power exceeds the power threshold can employ existing technology, and this embodiment does not limit this aspect.

[0045] The heartbeat signal receiving unit 24 is connected to the control unit 26. The heartbeat signal receiving unit 24 receives the heartbeat signal from the main controller 41 of the hot riveting machine power supply 4 and transmits the heartbeat signal to the control unit 26. When the heartbeat signal receiving unit 24 does not receive the heartbeat signal from the main controller 41, the control unit 26 determines that the main controller 41 is malfunctioning and outputs a control signal to cut off the power supply. By setting up the heartbeat signal receiving unit 24, the control unit 26 can monitor the status of the main controller 41 of the hot riveting machine power supply 4, and then control the power supply based on the status monitoring results to achieve the purpose of protecting the power supply. This embodiment does not limit the form of the heartbeat signal of the main controller 41 or the specific structure of the heartbeat signal receiving unit 24, as long as it can achieve the purpose of the control unit 26 monitoring the normal status of the main controller 41.

[0046] For example, in some embodiments, the heartbeat signal of the main controller 41 is a periodically changing high and low level pulse signal output through its IO pin, and the heartbeat signal receiving unit 24 is an IO module capable of receiving high and low level pulse signals.

[0047] The temperature signal receiving unit 25 receives a temperature signal from the main controller 41, which is the temperature of the riveting gun head of the hot riveting machine acquired by the main controller 41. The control unit 26 is connected to the temperature signal receiving unit 25, receives the temperature signal from the temperature signal receiving unit 25, and determines that the power supply system of the hot riveting machine is abnormal when the temperature corresponding to the temperature signal exceeds the temperature threshold, such as a short circuit or software abnormality, and outputs a control signal to cut off the power supply. In this embodiment, the power protection circuit, being a separate circuit independent of the hot riveting machine power supply, cannot directly obtain the temperature at the riveting gun head. This embodiment uses the temperature signal receiving unit 25 to enable the control unit 26 to receive the temperature signal from the main controller 41, determine whether the power supply system of the hot riveting machine is abnormal based on the temperature signal, and control the power supply when an abnormality occurs, thereby protecting the power supply. This embodiment does not limit the form of the temperature signal from the main controller 41 or the specific structure of the temperature signal receiving unit 25, as long as the control unit 26 can obtain the temperature at the riveting gun head of the hot riveting machine.

[0048] For example, in some embodiments, the main controller 41 outputs a temperature signal corresponding to the temperature value through a binary number formed by the high and low level signals of its multiple IO pins; correspondingly, the temperature signal receiving unit 25 is an IO module capable of receiving high and low level pulse signals.

[0049] The switching unit 27 is disposed between the power supply 4 of the riveting machine to be protected and the external power supply. It is used to receive control signals from the control unit 26, and when the control signal is a power cut-off control signal, the switching unit 27 operates to disconnect the connection between the power supply 4 of the riveting machine and the external power supply. This embodiment does not limit the specific structural form of the switching unit 27, as long as it can perform switching operations according to the control signals received from the control unit 26 to disconnect or maintain the connection between the power supply of the riveting machine and the external power supply.

[0050] In this embodiment, the entire protection circuit not only protects the power supply in a relatively independent and individually configurable manner through a hardware structure, but also protects the power supply from different dimensions based on multiple parameters. Specifically, the control unit 26 not only sends a control signal to the switching unit 27 to cut off the power supply when it determines that the power system is abnormal based on the power signal from the power metering unit 23; the control unit 26 also sends a control signal to the switching unit 27 to cut off the power supply when it determines that the main controller 41 is abnormal based on the heartbeat signal from the heartbeat signal receiving unit 24; and the control unit 26 also sends a control signal to the switching unit 27 to cut off the power supply when it determines that the main controller 41 is abnormal based on the temperature signal from the temperature signal receiving unit 25. This further improves the reliability of the power supply protection.

[0051] Figure 3 The circuit diagram of the third embodiment of the power protection circuit for the hot riveting machine of this utility model is shown.

[0052] like Figure 3 As shown, in this embodiment, the power protection circuit includes a current transformer L2, a voltage transformer L10, an energy metering integrated chip U1, a microcontroller U11, and a switching unit (not shown in the figure). The output terminal of the current transformer L2 is connected to the pins IIN+ and IIN- of the energy metering integrated chip U1, converting the large current signal of the hot riveting machine power circuit into a small current signal before transmitting it to the energy metering integrated chip U1. This achieves the conversion of the current in the hot riveting machine power circuit while preventing the strong electrical signal in the power circuit from impacting and interfering with the protection circuit. The voltage transformer L10 is a current-type voltage transformer with multiple current-limiting resistors connected in series on its primary coil, converting the voltage signal of the hot riveting machine power circuit into a milliampere-level current. The converted secondary output current signal is then converted back into a voltage signal through parallel resistors or an external current-to-voltage conversion circuit, and transmitted to the energy metering integrated chip U1 through the pin VIN+. Therefore, by using voltage transformer L10 to convert the voltage of the power supply circuit of the hot riveting machine, the high voltage signal in the power supply circuit can be prevented from impacting and interfering with the protection circuit.

[0053] The power metering integrated chip U1 automatically calculates the power supply instantaneous power based on the conversion current from the current transformer L2 and the conversion voltage from the voltage transformer L10.

[0054] In this embodiment, the microcontroller U11 serves as the core chip of the control unit in the protection circuit, forming the control unit in conjunction with relevant peripheral circuits. The pins SLK, SDO, and SDI of the energy metering integrated chip U1 are connected to the pins OC1A, OC0, and OC2OC1C of the microcontroller U1, respectively. The energy metering integrated chip U1 transmits the instantaneous power value it receives to the microcontroller U11 via SPI communication through these three pins. The microcontroller U11 internally compares the received power with a set power threshold. When the received power exceeds the threshold, it outputs a control signal to cut off the power supply to the switching unit. The switching unit disconnects the power supply of the hot riveting machine from the external power supply, thus protecting both the power supply and the hot riveting machine.

[0055] Figure 4 The circuit diagram of the fourth embodiment of the power protection circuit for the hot riveting machine of this utility model is shown. Specifically, it shows the circuit diagram between the control unit and the switching unit in the protection circuit.

[0056] like Figure 4As shown, in this embodiment, the power protection circuit includes a microcontroller U11, a driver chip U3, pin headers P1 and P2, and a relay K1; other structures of the power protection circuit are not shown, such as a current conversion unit, a voltage conversion unit, an energy metering unit, a heartbeat signal receiving unit, and a temperature signal receiving unit.

[0057] In this embodiment, the microcontroller U11 serves as the core chip of the control unit in the protection circuit. It forms the control unit in conjunction with relevant peripheral circuits. Based on the power signal from the power metering unit, and / or the heartbeat signal from the heartbeat signal receiving unit, and / or the temperature signal from the temperature signal receiving unit, it obtains a control signal. This control signal is then transmitted to the driver chip U3 via its pin A9, which connects to pin 3B of the driver chip. The driver chip U3 processes the control signal received from the microcontroller U11, enhancing its driving capability. The enhanced control signal is output through its pin 3C, and then connected to pin 1 of the relay K1 (which serves as the control terminal) via pins 3 of pin header P2 and pins 3 of pin header P1. This enables the microcontroller U11 to control the switching action of the relay K1 according to the control signal. Specifically, when the control signal is a power cut-off control signal, the coil between pin 1 and pin 4 of relay K1 is de-energized, and the switch between pin 2 and pin 3 is opened, cutting off the connection between the external power supply that supplies power through the switch between pin 2 and pin 3 and the power supply, thereby protecting the power supply and the hot riveting machine.

[0058] The power protection circuits of the above embodiments are applied in the hot riveting machine, which makes the hot riveting machine have high power protection reliability.

[0059] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A power supply protection circuit for a hot riveting machine, wherein the power supply for the hot riveting machine includes a main controller, characterized in that, The protection circuit includes: The current conversion unit is used to convert the current in the power supply circuit of the hot riveting machine and output the converted current. The voltage conversion unit is used to convert the voltage of the power supply circuit of the hot riveting machine and output the converted voltage; An energy metering unit is used to receive the converted current from the current conversion unit and the converted voltage from the voltage conversion unit, and to obtain the power supply based on the converted current and the converted voltage. The control unit is configured to receive the power supply from the power metering unit and output a control signal to cut off the power supply when the power supply exceeds a power threshold. A switching unit is configured to be located between the power supply of the hot riveting machine and the external power supply, and is also configured to receive a control signal from the control unit. When the control signal is the control signal for cutting off the power supply, the switching unit disconnects the power supply of the hot riveting machine from the external power supply.

2. The power protection circuit for the hot riveting machine according to claim 1, characterized in that, The switching unit is a relay; The protection circuit also includes: The drive circuit unit is used to drive the control signal received from the control unit and transmit the driven control signal to the control terminal of the relay.

3. The power protection circuit for the hot riveting machine according to claim 1 or 2, characterized in that, The protection circuit also includes: A heartbeat signal receiving unit is used to receive the heartbeat signal from the main controller; The control unit is also configured to connect to the heartbeat signal receiving unit and output the power cut-off control signal when the heartbeat signal receiving unit does not receive the heartbeat signal.

4. The power protection circuit for the hot riveting machine according to claim 1 or 2, characterized in that, The protection circuit also includes: A temperature signal receiving unit is used to receive temperature signals from the main controller; The control unit is also configured to connect to the temperature signal receiving unit, receive the temperature signal from the temperature signal receiving unit, and output the power cut-off control signal when the temperature corresponding to the temperature signal exceeds the temperature threshold.

5. A hot riveting machine, comprising a hot riveting machine power supply, wherein the hot riveting machine power supply includes a main controller, characterized in that, The hot riveting machine also includes a hot riveting machine power protection circuit; The protection circuit includes: The current conversion unit is used to convert the current in the circuit of the hot riveting machine power supply and output the converted current. A voltage conversion unit is used to convert the voltage of the circuit of the hot riveting machine power supply and output the converted voltage; An energy metering unit is used to receive the converted current from the current conversion unit and the converted voltage from the voltage conversion unit, and to obtain the power supply based on the converted current and the converted voltage. The control unit is configured to receive the power supply from the power metering unit and output a control signal to cut off the power supply when the power supply exceeds a power threshold. A switching unit is configured to be located between the power supply of the hot riveting machine and the external power supply, and is also configured to receive a control signal from the control unit. When the control signal is the control signal for cutting off the power supply, the switching unit disconnects the power supply of the hot riveting machine from the external power supply.

6. The hot riveting machine according to claim 5, characterized in that, The switching unit is a relay; The protection circuit also includes: The drive circuit unit is used to drive the control signal received from the control unit and transmit the driven control signal to the control terminal of the relay.

7. The hot riveting machine according to claim 5 or 6, characterized in that, The protection circuit also includes: A heartbeat signal receiving unit is used to receive the heartbeat signal from the main controller; The control unit is also configured to connect to the heartbeat signal receiving unit and output the power cut-off control signal when the heartbeat signal receiving unit does not receive the heartbeat signal.

8. The hot riveting machine according to claim 5 or 6, characterized in that, The protection circuit also includes: A temperature signal receiving unit is used to receive temperature signals from the main controller; The control unit is also configured to connect to the temperature signal receiving unit, receive the temperature signal from the temperature signal receiving unit, and output the power cut-off control signal when the temperature corresponding to the temperature signal exceeds the temperature threshold.

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