Explosion-proof handle device with 485 communication and display function for crane

Abstract

This invention provides an explosion-proof crane handle device with 485 communication and display function, including a control unit. The control unit is connected to a power supply unit, a 485 communication unit, a display unit, and a control switch unit. The 485 communication unit has an RS-485 bus transceiver and communication terminals. The RS-485 bus transceiver is connected to the UART interface of the control unit, and the differential port of the RS-485 bus transceiver is connected to the communication terminals. A protection circuit is connected to the communication terminals. The display unit has a display screen and display screen wiring terminals connected to the display screen. The display screen wiring terminals are connected to the control unit. This invention can establish communication with the crane controller, obtain crane status data through the handle, promptly detect abnormalities, and reduce safety hazards.

Description

Technical Field

[0001] This utility model belongs to the field of crane technology, specifically relating to an explosion-proof handle device for cranes with 485 communication and display function. Background Technology

[0002] In industrial lifting operations, traditional explosion-proof crane handles have significant shortcomings. Traditional explosion-proof crane handles have limited functionality, only controlling basic mechanical movements such as lifting and lowering. They lack real-time monitoring capabilities, preventing operators from obtaining crane status data such as inverter status, limit switch status, fault alarm information, and lifting capacity through the handle. Operators must rely on visual observation or stopping the machine for inspection, which can easily lead to safety accidents and fails to meet the high safety and intelligence requirements of modern industry.

[0003] Therefore, it is necessary to design an explosion-proof crane handle device with 485 communication and display function that can establish communication with the crane controller, obtain crane status data through the handle, and reduce safety hazards to solve the current technical problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides an explosion-proof handle device for cranes with 485 communication and display function, which can establish communication with the crane controller, obtain crane status data through the handle, and reduce safety hazards.

[0005] The technical solution of this utility model is: a crane explosion-proof handle device with 485 communication and display function, including a control unit, which is connected to a power supply unit, a 485 communication unit, a display unit, and a control switch unit; The 485 communication unit has an RS-485 bus transceiver and a communication terminal. The RS-485 bus transceiver is connected to the UART interface of the control unit. The differential port of the RS-485 bus transceiver is connected to the communication terminal. A protection circuit is connected to the communication terminal. The display unit has a display screen and a display screen terminal connected to the display screen, and the display screen terminal is connected to the control unit.

[0006] Furthermore, the protection circuit has a TVS4 transistor, a capacitor V1, and a discharge transistor G2 connected in parallel between the 12V power supply and the digital ground. One end of the discharge transistor G2 closest to the 12V power supply is connected to pin 4 of the communication terminal. The RS-485 bus transceiver differential port has a terminal A and a terminal B. A resistor R4 and a resistor R5 are connected in series between the terminal A and the 3V power supply. The resistor R4 and the resistor R5 are connected to pin 2 of the communication terminal. A TVS transistor TVS3 is connected in series between the resistor R4 and the resistor R5 and the digital ground. A capacitor CP2 is connected in parallel with the TVS transistor TVS3. A resistor R3 and a resistor R1 are connected in series between the B terminal and the digital ground. The resistor R3 and the resistor R1 are connected to pin 1 of the communication terminal. A TVS transistor TVS1 and a capacitor CP1 are connected in parallel with the resistor R1. A TVS transistor TVS2 and a discharge tube G1 are connected in parallel between pin 1 and pin 2 of the communication terminal. The discharge tube G1 is connected to the digital ground. Pin 4 of the communication terminal is connected to digital ground.

[0007] Furthermore, the control switch unit has a single-channel switch unit and a dual-channel switch unit; the single-channel switch unit has a single-channel switch connected to the control unit, and the dual-channel switch unit has a dual-channel switch connected to the control unit.

[0008] Furthermore, the connection terminals between the single-channel switch, the dual-channel switch, and the control unit are all connected to an RC filter branch.

[0009] Furthermore, the display unit has a backlight control circuit, which has a transistor Q1 connected between the display terminal and the digital ground. The transistor Q1 is connected to the control unit through a resistor R6.

[0010] Furthermore, the power supply unit has a power supply controller, the VREF+ terminal of the power supply controller is connected to a 2.5V power supply, the VREF- terminal and the VSS terminal of the power supply controller are connected to digital ground, and the VDD terminal of the power supply controller is used to provide a 3.3V power supply.

[0011] The beneficial effects of this utility model are: (1) The control unit communicates with the crane's PLC through the 485 communication unit, controls each control button in the switch unit, and transmits control commands to the PLC to control the crane's operation through the 485 communication between the control unit and the crane. (2) The control unit communicates with the crane PLC using the 485 communication unit and receives crane status data such as inverter status, limit switch status, fault alarm information, and lifting capacity collected by the PLC. The control unit displays the crane status data using the display unit, which makes it convenient to obtain the crane status data when operating the handle, detect abnormalities in time, and reduce safety hazards. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the explosion-proof handle device for cranes with 485 communication and display function in this utility model.

[0013] Figure 2 This is a circuit diagram of the control unit and control switch unit in this utility model.

[0014] Figure 3 This is a circuit diagram of the control unit in this utility model.

[0015] Figure 4 This is a circuit diagram of the power supply unit in this utility model.

[0016] Figure 5 This is a circuit diagram of the 485 communication unit in this utility model.

[0017] Figure 6 This is a circuit diagram of the display unit in this utility model.

[0018] Figure 7 This is a circuit diagram of the dual-channel switch unit in this utility model.

[0019] Figure 8 This is a circuit diagram of the single-channel switch unit in this utility model. Detailed Implementation

[0020] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0021] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] like Figures 1 to 8As shown, a crane explosion-proof handle device with 485 communication and display function is disclosed, including a control unit 1. The control unit 1 is connected to a power supply unit 2, a 485 communication unit 3, a display unit 6, and a control switch unit. The 485 communication unit 3 has an RS-485 bus transceiver U1 and a communication terminal JP2. The RS-485 bus transceiver U1 is connected to the UART interface of the control unit 1, and the differential port of the RS-485 bus transceiver is connected to the communication terminal JP2. A protection circuit is connected to the communication terminal JP2. The display unit 6 has a display screen and a display screen wiring terminal JP1 connected to the display screen. The display screen wiring terminal JP1 is connected to the control unit 1. Connection; In this embodiment, the control unit 1 communicates with the crane's PLC via the 485 communication unit 3, controls each control button in the switch unit, and transmits control commands to the PLC to control the crane's operation via the 485 communication between the control unit 1 and the crane; the PLC transmits the crane status data it collects, such as the inverter status, limit switch status, fault alarm information, and lifting capacity, to the control unit 1 via the 485 communication. The control unit 1 displays the crane status data using the display unit 6, making it convenient to obtain the crane status data when operating the handle, promptly detect abnormalities, and reduce safety hazards; a protection circuit is connected to the communication terminal JP2.

[0023] In some embodiments, the protection circuit includes a TVS4 transistor, a capacitor, and a discharge transistor G2 connected in parallel between the 12V power supply and digital ground. One end of the discharge transistor G2 closest to the 12V power supply is connected to pin 4 of the communication terminal. The RS-485 bus transceiver U1 has a differential port with terminals A and B. Resistors R4 and R5 are connected in series between terminal A and the 3V power supply. Resistors R4 and R5 are connected to pin 2 of the communication terminal. A TVS3 transistor is connected in series between resistors R4 and R5 and digital ground. A capacitor CP2 is connected in parallel with TVS3. A capacitor CP2 is connected in parallel with terminal B and digital ground. Resistors R3 and R1 are connected to pin 1 of the communication terminal. A TVS diode (TVS1) and capacitor CP1 are connected in parallel with resistor R1. A TVS diode (TVS2) and discharge diode G1 are connected in parallel between pin 1 and pin 2 of the communication terminal. Discharge diode G1 is connected to digital ground. Pin 4 of the communication terminal is connected to digital ground. The RS-485 bus transceiver U1 is used to convert the UART serial port signal of control unit 1 into an RS-485 differential signal. TVS diodes TVS1, TVS2, TVS3, and TVS4 respectively suppress electrostatic discharge and surge on the RS-485 bus and the 12V power supply circuit, forming multi-layer protection. Discharge diodes G1 and G2 realize surge and electrostatic discharge of the RS-485 bus, quickly suppress transient interference on the bus, and protect the RS-485 bus transceiver U1.

[0024] In some embodiments, the control switch unit includes a single-channel switch unit 5 and a dual-channel switch unit 4; the single-channel switch unit 5 has a single-channel switch connected to the control unit 1, and the dual-channel switch unit 4 has a dual-channel switch connected to the control unit 1; such as Figure 8 As shown, a circuit diagram of a single-channel switching unit 5 is disclosed, which supports only one switching signal output; as Figure 7 The diagram shows a circuit diagram of a dual-channel switch unit 4, which supports the output of two switch signals. The number of single-channel switch units 5 and dual-channel switch units 4 can be selected according to actual needs to meet different control requirements.

[0025] In some embodiments, the connection terminals between the single-channel switch, the double-channel switch, and the control unit 1 are all connected to an RC filter branch. When the switch is pressed or released, high-frequency noise is generated due to the instantaneous switching of the contacts. The capacitor in the RC filter branch can bypass the high-frequency noise to ground, and the resistor plays a damping role, together filtering out these interference signals and preventing them from causing false triggering or interference to the control unit 1. Furthermore, by utilizing the charging and discharging characteristics of the RC filter branch, the jittering pulse signal is "smoothed" so that the switch signal received by the control unit 1 is a stable level transition, thereby avoiding program misjudgment caused by jitter.

[0026] In some embodiments, such as Figure 6 As shown, the display unit has a backlight control circuit, which has a transistor Q1 connected between the display terminal JP1 and the digital ground. The transistor Q1 is connected to the control unit 1 through a resistor R6. The control unit 1 controls the output state of the pin connected to the resistor R6, which can control the conduction or cutoff of the transistor Q1, thereby realizing the backlight control of the display screen.

[0027] In some embodiments, the power supply unit has a power supply controller, the VREF+ terminal of the power supply controller is connected to a 2.5V power supply, the VREF- terminal and the VSS terminal of the power supply controller are connected to digital ground, and the VDD terminal of the power supply controller is used to provide a 3.3V power supply.

[0028] In the above embodiment, more specifically, the control unit 1 is an STM32F103VCT6 microcontroller minimum system; the discharge tube G1 is a 3R075TA-6 triode gas discharge tube; the discharge tube G2 is a 2RM075L-8 discharge tube; and the RS-485 bus transceiver U1 is an SP3485 chip.

[0029] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0030] The embodiments described above only illustrate some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A 485 communication band display function crane explosion-proof handle device, characterized in that: It includes a control unit, which is connected to a power supply unit, a 485 communication unit, a display unit, and a control switch unit; The 485 communication unit has an RS-485 bus transceiver and a communication terminal. The RS-485 bus transceiver is connected to the UART interface of the control unit. The differential port of the RS-485 bus transceiver is connected to the communication terminal. A protection circuit is connected to the communication terminal. The display unit has a display screen and a display screen terminal connected to the display screen, and the display screen terminal is connected to the control unit.

2. The explosion-proof handle device for a crane with a 485 communication band display function according to claim 1, characterized by: The protection circuit has a TVS4 transistor, a capacitor V1, and a discharge transistor G2 connected in parallel between the 12V power supply and digital ground. The end of the discharge transistor G2 closest to the 12V power supply is connected to pin 4 of the communication terminal. The RS-485 bus transceiver differential port has a terminal A and a terminal B. A resistor R4 and a resistor R5 are connected in series between the terminal A and the 3V power supply. The resistor R4 and the resistor R5 are connected to pin 2 of the communication terminal. A TVS transistor TVS3 is connected in series between the resistor R4 and the resistor R5 and the digital ground. A capacitor CP2 is connected in parallel with the TVS transistor TVS3. A resistor R3 and a resistor R1 are connected in series between the B terminal and the digital ground. The resistor R3 and the resistor R1 are connected to pin 1 of the communication terminal. A TVS transistor TVS1 and a capacitor CP1 are connected in parallel with the resistor R1. A TVS transistor TVS2 and a discharge tube G1 are connected in parallel between pin 1 and pin 2 of the communication terminal. The discharge tube G1 is connected to the digital ground. Pin 4 of the communication terminal is connected to digital ground.

3. The explosion-proof handle device for a crane with a 485 communication band display function according to claim 1, characterized by: The control switch unit has a single-channel switch unit and a dual-channel switch unit; the single-channel switch unit has a single-channel switch connected to the control unit, and the dual-channel switch unit has a dual-channel switch connected to the control unit.

4. The explosion-proof handle device for a crane with a 485 communication band display function according to claim 3, characterized by: The connection terminals between the single-channel switch, the dual-channel switch, and the control unit are all connected to RC filter branches.

5. The explosion-proof handle device for a crane with a 485 communication band display function according to claim 1, characterized by: The display unit has a backlight control circuit, which has a transistor Q1 connected between the display terminal and the digital ground. The transistor Q1 is connected to the control unit through a resistor R6.

6. The explosion-proof handle device for a crane with a 485 communication band display function according to claim 1, characterized by: The power supply unit has a power supply controller. The VREF+ terminal of the power supply controller is connected to a 2.5V power supply. The VREF- terminal and the VSS terminal of the power supply controller are connected to digital ground. The VDD terminal of the power supply controller is used to provide a 3.3V power supply.

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