JP3057738U - Electrical system safety device for lorry with lifting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To eliminate the danger of wiring burnout and fire caused by short-circuiting of electrical wiring when power is always supplied to the power unit on the lifting device side. SOLUTION: This is an electric system safety device for a lorry equipped with a lifting device equipped with a lifting device for raising and lowering a cargo handling platform 3 using a power unit 10 for driving a hydraulic pump 12 with a motor 13 as a hydraulic pressure source, wherein the vehicle is mounted as a DC power supply. A safety device 20 having a built-in electromagnetic relay 21 is provided in the vicinity of the battery 30, and a lift device switch 40 for operating the electromagnetic relay 21 is attached to a driver's seat. Only when the contact of the electromagnetic relay 21 is closed, power can be supplied to the power unit through the contact of the relay.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an electric system safety device for a lorry equipped with a lifting device equipped with a lifting device for raising and lowering a cargo handling platform using a power unit that drives a hydraulic pump by an electric motor as a hydraulic source.

[0002]

[Prior art]

 In recent years, in order to save labor in loading and unloading work on lorry vehicles, lorry vehicles with lifting devices equipped with lifting devices that raise and lower loading platforms using a power unit that drives a hydraulic pump with an electric motor as a hydraulic source have been widely used. It has become to.

[0003] Since a lifting device for raising and lowering the cargo handling platform is usually mounted at the rear of the vehicle, a power unit serving as a hydraulic pressure source for the lifting device is also arranged at the rear of the vehicle. The reason is that the hydraulic piping for supplying hydraulic oil to the hydraulic cylinder that drives the lifting platform of the lifting device to reduce the hydraulic pressure loss is reduced. For this reason, the electric wiring for supplying DC voltage to the vehicle battery and the electric motor of the power unit, which are located near the vehicle engine, that is, slightly in front of the vehicle, are considerably long, and have a large current capacity to allow a large current to flow. Large and thick electric wires are used.

[0006] The turning on and off of the voltage supply of the electric motor in the power unit is usually performed by a switch on the power unit side. For this reason, electricity is supplied to the electrical wiring from the battery to the power unit regardless of whether the lifting device is used or not.

[0005]

[Problems to be solved by the invention]

 As described above, the electrical wiring from the vehicle-mounted battery to the power unit is energized regardless of whether the lifting device that raises and lowers the cargo handling platform is used. There is a risk of electric leakage due to a short circuit due to a vehicle accident, and not only burning of the electric wiring, but also fire of the electric wiring and a vehicle fire. In particular, when the vehicle is long, the danger cannot be ignored because the electric wiring from the on-board battery to the power unit arranged at the rear of the vehicle becomes extremely long.

[0006] In view of the above, the present invention provides a safety device near an on-vehicle battery and enables control of the safety device from a driver's seat. In this way, the electric safety system for a truck with a lifting device that eliminates the danger of wiring burnout and fire caused by short-circuiting of the electrical wiring when the power unit on the lifting device side has been always connected to the power unit has been removed. The purpose is to provide.

[0007] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the first electric safety device for a truck with a lifting device according to the present invention includes a lifting device for lifting and lowering a cargo handling platform using a power unit that drives a hydraulic pump by an electric motor as a hydraulic source. In the mounted configuration, a safety device having a built-in electromagnetic relay is provided near a vehicle-mounted battery serving as a DC power supply, and a switch for a lifting device for operating the electromagnetic relay is attached to a driver's seat, and the switch for the lifting device in the driver's seat is provided. Only when the contact point of the electromagnetic relay is closed by the switch operation, the power unit side can be energized through the contact point of the relay.

Further, the second electric safety device for a truck with a lifting device according to the present invention is equipped with a lifting device for lifting and lowering a cargo handling platform using a power unit that drives a hydraulic pump by a motor as a hydraulic source. In the configuration, a safety device having a built-in electromagnetic relay is provided near a vehicle-mounted battery serving as a DC power supply, a switch for an elevating device for operating the electromagnetic relay is mounted on a driver's seat, and wiring for connecting the battery and the motor is provided. In addition, a contact of the electromagnetic relay is inserted separately from the power switch on the power unit side, and only when the contact of the electromagnetic relay is closed by a switch operation of the lift device switch in the driver's seat, the direct current from the battery is A voltage is supplied to the power unit side.

[0010] Further, the third electric safety system for a lorry with a lifting device according to the present invention is provided with a lifting device for lifting and lowering a cargo handling platform using a power unit that drives a hydraulic pump with an electric motor as a hydraulic source. , A safety device having a built-in electromagnetic relay and a fuse is provided near a vehicle-mounted battery as a DC power supply, a switch for a lifting device for operating the electromagnetic relay is mounted on a driver's seat, and wiring for connecting the battery and the electric motor is provided. Then, separately from the power switch on the power unit side, the contact point of the electromagnetic relay and the fuse were inserted in series, and the contact point of the electromagnetic relay was closed by operating the switch for the lifting device in the driver's seat. DC voltage from the battery is supplied to the power unit only when It is characterized.

[0011] In the electric safety system for a freight vehicle with a lifting device according to claim 1, 2, or 3, it is preferable that a display means that is turned on by operating a switch of the lifting device switch is provided.

Other objects and novel features of the present invention will be clarified in embodiments described later.

[0013]

[Embodiment of the invention]

 Hereinafter, an embodiment of an electric system safety device for a truck with a lifting device according to the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of an electric system safety device for a lorry with a lifting device according to the present invention, FIG. 2 is a perspective view of a switch for a lifting device (car lift) attached to a driver's seat (cabin), FIG. 3 is a perspective view showing a state in which the switch for the lifting device is attached to the driver's seat.

[0015] In these figures, reference numeral 1 denotes a lifting device, which is mounted on the rear part of a truck (packing box) of a lorry, has a hydraulic circuit 2 including a hydraulic cylinder and the like, and lifts and lowers a loading platform 3. It is driven to load and unload cargo on the carrier.

Reference numeral 10 denotes a power unit, a pump 12 for pumping hydraulic oil in an oil tank 11 and sending it out to the hydraulic circuit 2 on the lifting device side, a DC motor 13 for rotating the pump 12, and a power supply in the power unit. -It has the electromagnetic relay 14 etc. which have the off contact 14a. The power unit 10 is installed near the elevating device 1 in order to make the hydraulic piping for the elevating device 1 as short as possible.

A safety device 20 includes an electromagnetic relay 21 having a power on / off contact 21 a, a main circuit fuse (for example, 100 A) 22, and an auxiliary circuit fuse (for example, 10 A) 23. . The safety device 20 is arranged near the vehicle-mounted battery 30, and has a power on / off contact 21 a of the electromagnetic relay 21 in the middle of an electric wire connecting one pole (for example, the positive side) of the battery 30 and the power unit 10. And a series circuit of the main circuit fuse 22 is inserted. That is, one end A of the power on / off contact 21a is connected to the power unit 10 via the main circuit fuse 22 and the electric wiring L1, and the other end B of the power on / off contact 21a is connected via the electric wiring L2. It is connected to one pole of the battery 30. Here, the electric wiring L2 is extremely short because the safety device 20 is near the battery 30.

As shown in FIG. 2 and FIG. 3, the power switch 41 as a display means is attached to the switch 40 for the lifting device attached to the driver's seat (cabin) 50. One end is connected to the fuse 23 for the accessory circuit in the safety device 20 via the connector part 42, and is connected to the other end B of the power on / off contact 21a through the fuse 23 for the accessory circuit. By grounding the ground wire 44 in FIG. 2, the power lamp 41 as a display means is connected between the other end of the switch 40 for the lifting device and the ground, and the other end of the switch 40 for the lifting device is connected to the other end. The terminal D of the electromagnetic relay 21 is connected to the terminal D of the electromagnetic relay 21 via the connector 43, and the terminal C of the electromagnetic relay 21 is grounded. The power lamp 41 indicates that the switch 40 for the elevating device is in the ON state, that is, the power supply state.

The power unit 10, the safety device 20, the battery 30, and the ground side of the power supply lamp 41 are generally electrically connected to each other by using a conductor of a truck.

In this embodiment, when the operator operates the elevator switch 40 of the driver's seat 50 shown in FIG. 3 to turn it on, the battery 30, the auxiliary circuit fuse 23, the elevator switch 40, and the electromagnetic switch As a result of the current flowing in the path of the relay 21 and the electromagnetic relay 21 being excited, the power on / off contact 21a is turned on, and the electric wiring L2, the power on / off contact 21a and the electric wiring L1 are connected to the power unit 10. Is supplied from the battery 30 (DC voltage is supplied to the power unit 10). At this time, the power supply lamp 41 is turned on in accordance with the operation of turning on the lifting / lowering device switch 40, thereby indicating that power is being supplied to the lifting / lowering device 1 side.

By controlling the electromagnetic relay 14 of the power unit 10 by the lifting device 1, the power on / off contact 14 a in the power unit is turned on and off, and the operation to the hydraulic circuit 2 including the hydraulic cylinder and the like is performed. It is possible to control the oil supply and drive the cargo handling platform 3 up and down to load and unload cargo on the cargo platform.

When the elevator 1 is not used or when the truck is running, the elevator switch 40 in the driver's seat is turned off. As a result, the electromagnetic relay 21 is not excited, the power on / off contact 21a is off, and the electric wiring L1 connecting the safety device 20 and the power unit 10 is not energized. Therefore, it is possible to prevent the inconvenience that the electric wiring L1 tends to be longer than the power unit 10 disposed at the rear of the vehicle, and the electric wiring L1 is insulated and deteriorated, and the electric wiring is burned out or fire is caused due to a short circuit caused by an accident. Become. If the switch 40 for the elevating device is turned on while the electric wiring L1 is short-circuited, the fuse 22 for the main circuit is blown, thereby cutting off the power supply to the electric wiring L1 and preventing the electric wiring L1 from burning and fire. it can.

The configurations of the lifting device 1, the control circuit unit 2, and the power unit 10 are arbitrary.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.

[0025]

[Effect of the invention]

 As described above, according to the electrical safety device for a truck with a lifting device according to the present invention, a safety device is provided near the vehicle-mounted battery and the safety device can be controlled from the driver's seat. By turning off the power supply to the electrical wiring from the elevator to the lifting device, the risk of burnout of the wiring and fire danger caused by short-circuiting of the electrical wiring when the power unit on the lifting device side is always energized in the past is eliminated. Is possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an electric system safety device for a lorry with a lifting device according to the present invention.

FIG. 2 is a perspective view of a lift device switch used in the embodiment.

FIG. 3 is a perspective view showing an arrangement of a switch for a lifting device in a driver's seat in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifting device 2 Hydraulic circuit 3 Loading platform 10 Power unit 11 Oil tank 12 Pump 13 DC motor 20 Safety device 21 Electromagnetic relay 21a Power ON / OFF contact 22 Main circuit fuse 23 Fuse for attached circuit 30 Battery 40 Switch for lifting device 41 Power lamp 50 Driver's seat

Claims (4)

[Utility model registration claims] 1. An electric system safety device for a lorry equipped with a lifting device equipped with a lifting device for raising and lowering a cargo handling platform using a power unit that drives a hydraulic pump by an electric motor as a hydraulic power source, wherein the vehicle is located near a vehicle-mounted battery as a DC power supply. A safety device with a built-in electromagnetic relay is provided at a position, and a switch for the lifting device for operating the electromagnetic relay is attached to a driver's seat, and when the switch of the switch for the lifting device on the driver's seat closes the contact of the electromagnetic relay. An electrical system safety device for a lorry with a lifting device, wherein only the power unit side can be energized through the contact point of the relay. 2. An electric system safety device for a lorry equipped with a lifting device equipped with a lifting device for raising and lowering a cargo handling platform using a power unit that drives a hydraulic pump by an electric motor as a hydraulic source. A safety device with a built-in electromagnetic relay is provided at the position, a switch for a lifting device that activates the electromagnetic relay is attached to the driver's seat, and the wiring connecting the battery and the electric motor is separated from the power switch on the power unit side. The contact of the electromagnetic relay is inserted, and the DC voltage from the battery is supplied to the power unit only when the contact of the electromagnetic relay is closed by the switch operation of the lift device switch in the driver's seat. Characteristic electrical safety equipment for lorries with lifting equipment. 3. An electric system safety device for a lorry equipped with a lifting device equipped with a lifting device for raising and lowering a cargo handling platform using a power unit that drives a hydraulic pump by an electric motor as a hydraulic source, in the vicinity of a vehicle-mounted battery as a DC power supply. A safety device with a built-in electromagnetic relay and fuse is provided at a position, a switch for a lifting device that activates the electromagnetic relay is attached to a driver's seat, and wiring connecting the battery and the electric motor is provided.
Separately from the power switch on the power unit side, the contact of the electromagnetic relay and the fuse are inserted in series, and only when the contact of the electromagnetic relay is closed by a switch operation of the switch for the lifting device in the driver's seat, the battery is disconnected from the battery. An electric system safety device for a lorry equipped with a lifting device, wherein a DC voltage is supplied to the power unit side. 4. A display means which is illuminated by a switch operation of the lifting device switch.
Or an electrical safety device for a truck with a lifting device according to item 3.