Active collision avoidance circuit for a fork lift truck

Abstract

This utility model discloses an active anti-collision circuit for forklifts, comprising: a first camera, a second camera, an anti-collision controller, an anti-collision drive circuit, and a power supply circuit. The second output terminal of the power supply circuit supplies power to the first camera, the second camera, and the anti-collision controller. The first camera is installed on the front side of the forklift, and the second camera is installed on the rear side. The anti-collision controller and the anti-collision drive circuit are both installed on the forklift. The first camera and the second camera are communicatively connected to the anti-collision controller. The anti-collision drive circuit includes: a control switch SW1, a switch pusher, and a pusher power supply control circuit. The control switch SW1 is connected in parallel with the brake switch SW2 in the forklift. The first output terminal of the power supply circuit supplies power to the switch pusher through the pusher power supply control circuit. This active anti-collision circuit for forklifts solves the problem in existing technologies that cannot automatically alert to people in front or behind.

Description

Technical Field

[0001] This utility model relates to the field of forklift control, specifically to an active anti-collision circuit for forklifts. Background Technology

[0002] In the prior art, a forklift includes: a vehicle body, a travel drive unit, a braking device, a main control box, and a brake switch. The travel drive unit is installed at the bottom of the vehicle body and is used to drive the vehicle body to move. The main control box is connected to the braking device through the brake switch.

[0003] Although the forklift described above can brake under the operation of the driver, it still has the following drawbacks: since forklifts are generally used in industrial production, the operators are often busy and may not be able to see people behind or in front of them, which may lead to the risk of hitting people. Therefore, how to automatically remind people in front or behind is the problem that this application needs to solve. Utility Model Content

[0004] This utility model aims to provide an active anti-collision circuit for forklifts, solving the problem that existing technologies cannot automatically alert drivers to people in front or behind them.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses an active anti-collision circuit for a forklift, including: a first camera, a second camera, an anti-collision controller, an anti-collision drive circuit, and a power supply circuit. The second output terminal of the power supply circuit supplies power to the first camera, the second camera, and the anti-collision controller. The first camera is installed on the front side of the forklift, the second camera is installed on the rear side of the forklift, and the anti-collision controller and the anti-collision drive circuit are both installed on the forklift. The first camera and the anti-collision controller are communicatively connected. The anti-collision drive circuit includes: a control switch SW1, a switch pusher, and a push power supply control circuit. The control switch SW1 is connected in parallel with the brake switch SW2 in the forklift. The first output terminal of the power supply circuit supplies power to the switch pusher through the push power supply control circuit. The switch pusher is used to push the control switch SW1 to perform a closing action. The control terminal of the switch pusher is connected to the first output terminal of the anti-collision controller.

[0007] Preferably, the anti-collision drive circuit is a relay, the coil in the relay is the switch actuation part, and the normally open switch in the relay is a control switch SW1.

[0008] Preferably, the power supply circuit includes: a first buck regulator module and a second buck regulator module. The input terminal of the first buck regulator module is connected to the DC power output terminal of the forklift, and the output terminal of the first buck regulator module is connected to the input terminal of the second buck regulator module. The input terminal of the second buck regulator module is the first output terminal of the power supply circuit, and the output terminal of the second buck regulator module is the second output terminal of the power supply circuit.

[0009] Preferably, the power supply circuit further includes: an input switching module and a voltage detection module. The input terminal of the voltage detection module is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the voltage detection module is connected to the first output terminal of the anti-collision controller. The output terminal of the voltage detection module is connected to the input terminal of the anti-collision controller. The input switching module is provided with a normally closed switch and a normally open switch. The first terminal of the normally closed switch and the first terminal of the normally open switch are connected to form the input terminal of the input switching module. The second terminal of the normally closed switch is the first output terminal of the input switching module. The second terminal of the normally closed switch is the second output terminal of the input switching module. The input terminal of the input switching module is connected to the DC power output terminal of the forklift. The first output terminal of the input switching module is connected to the input terminal of the first step-down voltage regulator module. The second output terminal of the input switching module is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the input switching module is connected to the second output terminal of the anti-collision controller.

[0010] Preferably, the voltage detection module includes: diode D1, transistor Q1 and resistor R1. The anode of diode D1 is the input terminal of the voltage detection module, the cathode of diode D1 is connected to the collector of transistor Q1, the emitter of transistor Q1 is connected to the first terminal of resistor R1, the second terminal of resistor R1 is grounded, the base of transistor Q1 is the control terminal of the voltage detection module, and the first terminal of resistor R1 is the output terminal of the voltage detection module.

[0011] Preferably, the first buck regulator module includes: a first buck regulator chip U1, a sliding resistor RV1, and a capacitor C1. The input terminal of the first buck regulator chip U1 is the input terminal of the first buck regulator module, and the output terminal of the first buck regulator chip U1 is the output terminal of the first buck regulator module. The output terminal of the first buck regulator chip U1 is connected to the positive terminal of the capacitor C1, the negative terminal of the capacitor C1 is grounded, the ADJ pin of the first buck regulator chip U1 is connected to the first fixed terminal of the sliding resistor RV1, the second fixed terminal of the sliding resistor RV1 is grounded, and the second fixed terminal of the sliding resistor RV1 is connected to the sliding terminal of the sliding resistor RV1.

[0012] Preferably, the drive power supply control circuit includes: a transistor Q2, the base of transistor Q2 is the control terminal of the drive power supply control circuit, the positive terminal of the switch drive unit is connected to the input terminal of the second buck regulator module, the negative terminal of the switch drive unit is connected to the collector of transistor Q2, and the emitter of transistor Q2 is grounded.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this application, a first camera is used to obtain an image of the front of the vehicle to determine if there is a person in front of the vehicle; a second camera is used to obtain an image of the rear of the vehicle to determine if there is a person behind the vehicle. The procedure for determining whether there is a person is known. This application only protects the layout of the first camera, the second camera, the anti-collision controller, the anti-collision drive circuit, and the power supply circuit, and does not protect the program. When the first camera detects a person in front or the second camera detects a person behind, the anti-collision controller controls the power supply control circuit to connect the switch push part to the first output terminal of the power supply circuit. After the switch push part is energized, it actuates, and the control switch SW1 changes from open to closed, thereby short-circuiting the brake switch SW2 in the forklift. Since the brake switch SW2 is short-circuited, it will send a voltage signal to the main control box in the forklift. The main control box can recognize this voltage signal and activate the braking device, thereby preventing a collision caused by the driver not seeing a person next to them.

[0015] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0016] Figure 1 This is a wiring diagram of the collision avoidance controller, collision avoidance drive circuit, and brake switch SW2 in the active collision avoidance circuit of a forklift.

[0017] Figure 2 This is a circuit diagram of the first buck regulator module, the second buck regulator module, the input switching module RL1, and the voltage detection module. Detailed Implementation

[0018] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] This utility model discloses an active anti-collision circuit for a forklift, including: a first camera, a second camera, an anti-collision controller U1, an anti-collision drive circuit U2, and a power supply circuit. The second output terminal of the power supply circuit supplies power to the first camera, the second camera, and the anti-collision controller U1. The first camera is installed on the front side of the forklift, and the second camera is installed on the rear side of the forklift. The anti-collision controller U1 and the anti-collision drive circuit U2 are both installed on the forklift. The first camera and the second camera are communicatively connected to the anti-collision controller U1. The anti-collision drive circuit U2 includes: a control switch SW1, a switch push part, and a push power supply control circuit. The control switch SW1 is connected in parallel with the brake switch SW2 in the forklift (e.g., ...). Figure 1 As shown), the first output terminal V1 of the power supply circuit supplies power to the switch push unit through the power supply control circuit. The switch push unit is used to push the control switch SW1 to perform a closing action. The control terminal of the switch push unit is connected to the first output terminal of the anti-collision controller U1.

[0020] In this application, the anti-collision controller U1 can be an STM32 series control chip, or other types of control chips.

[0021] Preferably, the anti-collision drive circuit U2 is a relay, with the coil in the relay serving as the switch actuation unit, and the normally open switch in the relay being a control switch SW1. Of course, the anti-collision drive circuit can be any other type of switch chip with control functions.

[0022] like Figure 2 As shown in this application, the power supply circuit includes a first buck regulator module and a second buck regulator module. The input terminal of the first buck regulator module is connected to the DC power output terminal of the forklift, and the output terminal of the first buck regulator module is connected to the input terminal of the second buck regulator module. The input terminal of the second buck regulator module is the first output terminal V1 of the power supply circuit, and the output terminal of the second buck regulator module is the second output terminal V2 of the power supply circuit. Since the input terminal of the first buck regulator module is generally connected to a 24V voltage, while the coil in the anti-collision drive circuit U2 requires a 12V power supply voltage, and the anti-collision controller U1 requires a 5V power supply voltage, the first buck regulator module is used to achieve the first voltage reduction, achieving an output voltage of 12V, and the second buck regulator module achieves the second voltage reduction, achieving an output voltage of 5V, thereby meeting the power supply requirements of different electrical components.

[0023] In this application, the power supply circuit further includes: an input switching module RL1 and a voltage detection module. The input terminal of the voltage detection module is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the voltage detection module is connected to the first output terminal of the anti-collision controller U1. The output terminal of the voltage detection module is connected to the input terminal of the anti-collision controller U1. The input switching module RL1 is provided with a normally closed switch and a normally open switch. The first terminal of the normally closed switch and the first terminal of the normally open switch are connected to form the input terminal of the input switching module RL1. The second terminal of the normally closed switch is the first output terminal of the input switching module RL1. The second terminal of the normally closed switch is the second output terminal of the input switching module RL1. The input terminal of the input switching module RL1 is connected to the DC power output terminal of the forklift. The first output terminal of the input switching module RL1 is connected to the input terminal of the first step-down voltage regulator module. The second output terminal of the input switching module RL1 is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the input switching module RL1 is connected to the second output terminal of the anti-collision controller U1.

[0024] Since the DC power supply in a forklift outputs either 12V or 24V, it's unclear whether the voltage is 12V or 24V upon initial connection. Therefore, this application provides a voltage detection module to detect the voltage and automatically switch modes after detection. This ensures that when the DC power supply output is 24V, the first step-down regulator module functions, while when it's 12V, it doesn't. This allows the entire power supply circuit to be used with either 12V or 24V DC power supplies, improving its practicality.

[0025] In this application, the input switching module RL1 is a relay with normally open and normally closed switches. Of course, other controllable switching elements with normally open and normally closed switches can also be used.

[0026] In this application, the voltage detection module includes a diode D1, a transistor Q1, and a resistor R1. The anode of diode D1 is the input terminal of the voltage detection module, the cathode of diode D1 is connected to the collector of transistor Q1, the emitter of transistor Q1 is connected to the first terminal of resistor R1, the second terminal of resistor R1 is grounded, the base of transistor Q1 is the control terminal of the voltage detection module, and the first terminal of resistor R1 is the output terminal of the voltage detection module. Diode D1 has a current-limiting function, preventing current from moving arbitrarily and affecting the current flow from the first buck regulator module to the second buck regulator module under normal use. When it is necessary to detect the voltage at the input terminal of the second buck regulator module, the second output terminal of the anti-collision controller U1 outputs a high level. After the base of transistor Q1 reaches a high level, transistor Q1 closes, and there is a voltage output at the first terminal of resistor R1. Since the resistance values ​​of diode D1, transistor Q1, and resistor R1 are constant, the difference between 12V and 24V voltages can be measured.

[0027] The first buck regulator module includes: a first buck regulator chip U1, a sliding resistor RV1, and a capacitor C1. The input terminal of the first buck regulator chip U1 is the input terminal of the first buck regulator module, and the output terminal of the first buck regulator chip U1 is the output terminal of the first buck regulator module. The output terminal of the first buck regulator chip U1 is connected to the positive terminal of the capacitor C1, and the negative terminal of the capacitor C1 is grounded. The ADJ pin of the first buck regulator chip U1 is connected to the first fixed terminal of the sliding resistor RV1, the second fixed terminal of the sliding resistor RV1 is grounded, and the second fixed terminal of the sliding resistor RV1 is connected to the sliding terminal of the sliding resistor RV1.

[0028] In this application, the first buck regulator chip U1 uses the LM317 model chip, but other buck regulator chips that can step down 24V to 12V can also be used. Capacitor C1 plays a voltage stabilizing role, and the output voltage of the first buck regulator chip U1 can be adjusted by adjusting the sliding resistor RV1.

[0029] In this application, the drive power supply control circuit includes a transistor Q2. The base of transistor Q2 is the control terminal of the drive power supply control circuit. The positive terminal of the switch drive unit is connected to the input terminal of the second buck regulator module, the negative terminal of the switch drive unit is connected to the collector of transistor Q2, and the emitter of transistor Q2 is grounded. The input switching module RL1 uses a relay, and the coil of the input switching module RL1 can also be driven by transistor Q2.

[0030] The second step-down voltage regulator module in this application is mainly implemented using the LM2595 step-down chip U2.

[0031] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A forklift active collision avoidance circuit, characterized by, include: The system includes a first camera, a second camera, an anti-collision controller, an anti-collision drive circuit, and a power supply circuit. The second output terminal of the power supply circuit supplies power to the first camera, the second camera, and the anti-collision controller. The first camera is installed on the front of the forklift, the second camera is installed on the rear of the forklift, and the anti-collision controller and anti-collision drive circuit are both installed on the forklift. The first camera is connected to the anti-collision controller, and the second camera is also connected to the anti-collision controller. The anti-collision drive circuit includes: a control switch, a switch pusher, and a pusher power supply control circuit. The control switch is connected in parallel with the brake switch in the forklift. The first output terminal of the power supply circuit supplies power to the switch pusher through the pusher power supply control circuit. The switch pusher is used to push the control switch to perform a closing action. The control terminal of the switch pusher is connected to the first output terminal of the anti-collision controller.

2. The forklift active collision avoidance circuit according to claim 1, characterized in that, The anti-collision drive circuit is a relay, in which the coil is the switch actuation part and the normally open switch is a control switch.

3. The forklift active collision avoidance circuit of claim 1 or 2, wherein, The power supply circuit includes a first buck regulator module and a second buck regulator module. The input terminal of the first buck regulator module is connected to the DC power output terminal of the forklift. The output terminal of the first buck regulator module is connected to the input terminal of the second buck regulator module. The input terminal of the second buck regulator module is the first output terminal of the power supply circuit, and the output terminal of the second buck regulator module is the second output terminal of the power supply circuit.

4. The forklift active collision avoidance circuit of claim 3, wherein, The power supply circuit also includes an input switching module and a voltage detection module. The input terminal of the voltage detection module is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the voltage detection module is connected to the first output terminal of the anti-collision controller. The output terminal of the voltage detection module is connected to the input terminal of the anti-collision controller. The input switching module is equipped with a normally closed switch and a normally open switch. The first terminal of the normally closed switch and the first terminal of the normally open switch are connected to form the input terminal of the input switching module. The second terminal of the normally closed switch is the first output terminal of the input switching module. The second terminal of the normally closed switch is the second output terminal of the input switching module. The input terminal of the input switching module is connected to the DC power output terminal of the forklift. The first output terminal of the input switching module is connected to the input terminal of the first step-down voltage regulator module. The second output terminal of the input switching module is connected to the input terminal of the second step-down voltage regulator module. The control terminal of the input switching module is connected to the second output terminal of the anti-collision controller.

5. The forklift active collision avoidance circuit of claim 4, wherein, The voltage detection module includes a diode D1, a transistor Q1, and a resistor R1. The anode of diode D1 is the input terminal of the voltage detection module, the cathode of diode D1 is connected to the collector of transistor Q1, the emitter of transistor Q1 is connected to the first terminal of resistor R1, the second terminal of resistor R1 is grounded, the base of transistor Q1 is the control terminal of the voltage detection module, and the first terminal of resistor R1 is the output terminal of the voltage detection module.

6. The forklift active collision avoidance circuit of claim 5, wherein, The first buck regulator module includes: a first buck regulator chip U1, a sliding resistor RV1, and a capacitor C1. The input terminal of the first buck regulator chip U1 is the input terminal of the first buck regulator module, and the output terminal of the first buck regulator chip U1 is the output terminal of the first buck regulator module. The output terminal of the first buck regulator chip U1 is connected to the positive terminal of the capacitor C1, and the negative terminal of the capacitor C1 is grounded. The ADJ pin of the first buck regulator chip U1 is connected to the first fixed terminal of the sliding resistor RV1, the second fixed terminal of the sliding resistor RV1 is grounded, and the second fixed terminal of the sliding resistor RV1 is connected to the sliding terminal of the sliding resistor RV1.

7. The forklift active collision avoidance circuit of claim 6, wherein, The power supply control circuit includes: transistor Q2, the base of transistor Q2 is the control terminal of the power supply control circuit, the positive terminal of the switch push unit is connected to the input terminal of the second step-down voltage regulator module, the negative terminal of the switch push unit is connected to the collector of transistor Q2, and the emitter of transistor Q2 is grounded.

Images