JP5459846B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a hydraulic control device that performs lifting control of a cargo cradle.

  In the load receiving table lifting device provided at the rear of the vehicle, the lifting and lowering of the load receiving table is controlled by the expansion and contraction operation of the hydraulic cylinder, and the control is performed by the hydraulic control device arranged in the vicinity of the load receiving table. The hydraulic control device is formed by unitizing a motor, a hydraulic pump, an electromagnetic valve that adjusts the supply / discharge amount of hydraulic oil, a control device that controls these, and the like.

  As shown in FIG. 10, the hydraulic control device 90 is attached to the rear of the vehicle and receives power supply from a vehicle battery 93 connected via an electric wiring 94. This power supply is performed in response to switching of the main switch 92 provided in the operator cab (cab) 91 to ON or OFF connection. The raising / lowering control of the stand 96 becomes possible. The raising / lowering control is performed, for example, when an operator operates the operation device 95 wired to the hydraulic control device 90 and outputs a signal to the hydraulic control device. Regarding the raising / lowering operation of the load receiving table 96 by the hydraulic control device 90, a load receiving operation device using a radio wave has been proposed in consideration of various work environments (Patent Document 1).

Japanese Patent No. 3998478

  In order to operate the load receiving stand 96 with the operating device 95, it is necessary that electric power is supplied to the hydraulic control device 90 and that it is in a driving state. On the other hand, it is necessary to switch off the main switch 92 to stop the power supply to the hydraulic control device 90 in order to put the hydraulic control device 90 in a non-driven state after the lifting operation of the load receiving platform 96 is completed. .

  The main switch 92 is provided in the cab 91 in order to prevent the third party from operating the cargo receiving stand 96 by setting power to be supplied to the hydraulic control device 90 without permission. Therefore, the main switch 92 must always be operated in the cab 91 in order to place the hydraulic control device 90 in a driving state or a non-driving state.

  The vehicle travels in various places. For example, when the vehicle enters a narrow road, the vehicle may be stopped and an operator may carry a necessary amount of cargo by a carriage or the like. In such a case, the operator enters the operator's cab 91 to switch off the main switch 92 before moving up and down the load receiving platform 96 and transporting it with a cart, etc., and returns to unload and transport another load. At that time, it is necessary to enter the cab 91 again and switch the main switch 92 to the ON connection. Such loading and unloading of luggage is very complicated for an operator because speediness is required even when the vehicle is stopped in place.

  The present invention has been made in view of the above problems, and it is possible to prevent a third party from raising and lowering the load receiving platform without permission, and to easily switch the driving state or the non-driving state with respect to the hydraulic control device. An object of the present invention is to provide a possible cargo receiving platform lifting device.

  In the present invention, a load receiving table lifting device having the following configuration is used.

  First, a load receiving platform lifting device including a load receiving platform that is provided at the rear of the vehicle and moves up and down between the loading platform and the ground, and a hydraulic control device that has a control unit that controls the lifting operation of the load receiving platform. The hydraulic control device includes an input unit that receives a switching command for switching the hydraulic control device to a driving state or a non-driving state, and an output signal from the input unit to switch between a driving state and a non-driving state. And a turning-on / off part that receives an output signal from the judging part and turns on / off the power supply to the control part. And an off signal input means for inputting a switching signal to the non-driving state from the control unit.

  Specifically, the switching signal is input to the off signal input means when a state in which the lifting operation of the load receiving table is not performed is continued for a predetermined time via the control unit.

As another example, a power supply device for setting the driving state is connected to the hydraulic control device, and the voltage value of the power supply device is smaller than a predetermined value to the off signal input means. The switching signal can also be input.

  In such a configuration, the determination unit may be provided with an input signal output unit that outputs information on the switching command to the control unit. The switching command input to the input unit may be unique data. The unique data can be input by placing a portable device having a unique authentication code close to the input unit. This portable device may be an operation unit that operates the lifting operation of the cargo receiving platform. The control unit may be connected to display means for displaying a driving state.

According to the configuration of the present invention, the hydraulic control device can be easily switched to the driven state or the non-driven state via the input unit provided in the hydraulic control device. Therefore, a great effect is obtained when the operator is required to be quick in carrying the load. In addition, by the setting switching signal for switching to a non-driving state is inputted to the determining unit from the control unit via an off-signal input means, to switch the hydraulic pressure control device in a non-driven state forgot worker Even in this case, the hydraulic control device can be automatically brought into a non-driven state. Further, by adopting a configuration in which a specific person can operate the input unit, it is possible to prevent a third party from moving the hydraulic control device in a driving state and moving the load receiving table up and down without permission.

It is the perspective view and schematic diagram which show arrangement | positioning of a hydraulic control apparatus. It is a schematic diagram regarding the structure of the hydraulic control apparatus which concerns on 1st Embodiment. It is a flowchart which shows the raising / lowering operation | movement of the cargo receiving stand which concerns on 1st Embodiment. It is a block diagram of the hydraulic control apparatus which shows the modification of 1st Embodiment. It is a block diagram of the hydraulic control apparatus which shows another modification of 1st Embodiment. It is a block diagram of the hydraulic control apparatus which concerns on 2nd Embodiment. It is a flowchart which shows the raising / lowering operation | movement of the cargo receiving stand which concerns on 2nd Embodiment. It is a schematic diagram which shows the electrical wiring of the hydraulic control apparatus which concerns on 3rd Embodiment. It is a block diagram of the hydraulic control apparatus which concerns on 4th Embodiment. It is a schematic diagram which shows arrangement | positioning of the conventional hydraulic control apparatus.

Embodiments according to the present invention will be described with reference to the drawings.
(First embodiment)

  FIG. 1A is a perspective view of a main part of the cargo receiving table lifting device 100. The load receiving table lifting device 100 is provided at the rear of the vehicle, and includes a load receiving stand 5 and a hydraulic control device 1 that controls the operation of the load receiving stand 5.

  The hydraulic control device 1 is arranged on a side portion at the rear of the vehicle, and has a configuration in which an electric motor, a hydraulic pump, an oil tank, a solenoid valve, and the like (not shown) are arranged in a resin casing 1a. . A hydraulic cylinder (not shown) is arranged between the load receiving platform 5 and the hydraulic control device 1, and hydraulic oil is supplied to the hydraulic cylinder by these devices (such as an electric motor) to raise and lower the load receiving platform 5. Is controlled.

The hydraulic control device 1 is connected to the vehicle battery 4 through the electric wiring 3 as shown in the schematic diagram of FIG. A part of the hydraulic control device 1 is provided with a configuration in which the input unit 11 is exposed to the outside. When the card 10 having a unique authentication code is brought close to the input unit 11, the hydraulic control device 1 supplies power. The power supply from the vehicle battery 4 as a device is in a driving state, and the lifting operation of the cargo receiving platform 5 is possible.
This power supply mechanism will be specifically described with reference to FIG. FIG. 2 is a schematic diagram showing the configuration of the hydraulic control device 1.

  The hydraulic control device 1 receives an output signal from the input unit 11 to which an external command is input, an output signal from the input unit 11, and receives and outputs an electric power signal from the vehicle battery 4. An on / off unit 13 and a control unit 14 for receiving an output signal from the on / off unit 13 and controlling expansion / contraction of the hydraulic cylinder are provided.

  When the card 10 having a unique authentication code is placed close to the input unit 11, the input unit 11 reads the authentication code and outputs a signal to the determination unit 12 (F1). The input unit 11 can read the authentication code at the reading part. The card 10 is non-contact type authentication means (so-called RFID) that is identified with the input unit 11 via a radio signal, and has a microchip on which a unique authentication code is stored. This authentication code is used for product identification of the hydraulic control device 1 and used for switching between the driving state and the non-driving state of the hydraulic control device 1, and is set and registered in the determination unit 12 described later, and is not registered. Similarly, even if cards having other authentication codes are arranged close to each other, they cannot be used for switching between a driving state and a non-driving state. For example, when the card 10 is brought close to the input unit 11, a weak electromagnetic wave emitted from the input unit 11 is received, electric power is generated via the antenna in the card 10, and the electromagnetic wave is directed from the card 10 toward the input unit 11. Responds with output.

  The determination unit 12 outputs a signal to the on / off unit 13 based on the output signal from the input unit 11 (F2). When information on the authentication code of the card 10 is input to the determination unit 12 via the input unit 11 to the hydraulic control device 1 in the non-driven state, a signal is output from the determination unit 12 to the on / off unit 13. The signal in this case is a switching signal for supplying the electric power from the vehicle battery 4 to the control unit 14 so as to change the hydraulic control device 1 from the non-driving state to the driving state. On the other hand, when the information of the authentication code of the card 10 is input to the driven hydraulic control device 1 via the input unit 11, the power supply to the control unit 14 is set to the “OFF” state (cut-off state). Is output to the on / off section 13.

  The on / off unit 13 is provided with a changeover switch (not shown) for supplying electric power from the vehicle battery 4 to the hydraulic control device 1. Specifically, when the changeover switch is on, the power of the vehicle battery is supplied to the control unit 14 via the on / off unit 13 (F4), and when the changeover switch is off, the power of the vehicle battery is supplied. Is blocked by the on / off section 13 and is not supplied to the control section 14. In addition, the signal output (F3) to the determination part 12 is also performed from the on / off part 13, and the information regarding the connection state (ON or OFF connection state) of the changeover switch in the on / off part 13 is also output. By outputting the information, the determination unit 12 can grasp the connection state of the change-over switch of the on / off unit 13, and when the signal from the input unit 11 is input, the change-over switch is turned on / off. An off connection command is output from the determination unit 12 to the cutting unit 13, and an on connection command is output from the determination unit 12 to the on / off unit 13 in the off state.

  An operation unit 20 is connected to the control unit 14 by wired wiring outside the hydraulic control device 1. When the electric power from the vehicle battery 4 is supplied, the lifting and lowering operation of the load receiving platform 5 can be performed by the switches SW1 and SW2 of the operation unit 20. Further, the control unit 14 is supplied with electric power to the control unit 14 such as a contactor relay CT that drives an electric motor or the like to control the lifting operation of the load receiving platform 5, a solenoid valve SOL that controls the flow of hydraulic oil, or the like. A display device LED that emits, for example, an LED in a connected state (on state) is also connected. The display device LED may be configured to be connected to a connection circuit between the on / off unit 13 and the control unit 14. By providing the display device LED, the operator determines whether or not the load receiving platform 5 can be moved up and down.

  Between the control unit 14 and the determination unit 12, an off signal input unit (F5) that is output from the control unit 14 and input to the determination unit 12 is provided. The means (F5) is in a state where the operation command (switching operation of SW1 and SW2) from the operation unit 20 is not input for a predetermined time despite the supply of electric power from the vehicle battery 4. The determination unit 12 has a function of outputting a signal for turning off the changeover switch of the on / off unit 13. With this function, even if the operator forgets to switch the hydraulic control device 1 from the driving state to the non-driving state, it can be automatically set to the non-driving state.

As in the present embodiment, the vehicle battery 4 and the hydraulic control device are installed in the cab 6 if the card 10 is arranged close to the input unit 11 to switch the power supply to the hydraulic control device 1. It is not necessary to provide a switch for turning on / off connection to or from 1. When this on / off switch is not provided in the cab 6, there is no need to provide electrical wiring for connecting the vehicle battery 4 and the cab 6. Since large parts such as the engine are arranged in the area where the vehicle battery 4 is arranged, the number of steps for installing the electric wiring while avoiding the parts is reduced, and a wiring hole is provided in the cab 6. Reduction of the process of providing can be realized, and the vehicle manufacturing cost can be greatly suppressed.
Next, the driving procedure of the hydraulic control apparatus 1 will be described using the flowchart of FIG.

  In order to set the hydraulic control device 1 in the non-driven state to the driving state, the operator places the card 10 in the vicinity of the input unit 11 so that the authentication code data of the card 10 is input (S1). Thereafter, the determination unit 12 determines whether the authentication code is unique data of the hydraulic control device 1 (S2). When it is determined that the data is “unique data”, the changeover switch of the on / off unit 13 is switched to the on connection (off connection to on connection), and the electric power of the vehicle battery 4 is supplied to the control device 14. On the other hand, if it is determined that the data is not unique data, the changeover switch of the on / off unit 13 is kept off (S21), and the power of the vehicle battery 4 is not supplied to the control device 14.

  When an operation input (operation of SW1 or SW2) is performed on the operation unit 20 in a state where electric power is supplied to the control device 14 (S4), the lifting operation of the cargo receiving platform 5 is started (S5). After the loading / unloading of the load receiving table 5 is completed (S6) after the loading / unloading of the load receiving table 5 has been continuously performed (S6), the card 10 is again placed near the input unit 11 by the operator. The authentication code data of the card 10 is input (S8), and the determination unit 12 determines whether the authentication code is unique data of the hydraulic control apparatus 1 (S9). If the determination unit 12 determines that the data is “unique data”, the selector switch of the on / off unit 13 is switched from off connection (on connection to off connection) (S10). As a result, the hydraulic control device 1 enters a non-driven state. On the other hand, if it is determined that the data is not unique data, the changeover switch of the on / off unit 13 is kept on (S91).

  In such a driving procedure, when the changeover switch of the on / off unit 13 is turned on (S3), that is, when the operation of the operation unit 20 is not performed for a predetermined time while the hydraulic control device 1 is in the driving state, the determination is made. A command to turn off the changeover switch of the on / off unit 13 is input to the unit 12 from the control unit 14 through the off signal input means F5. As a result, the hydraulic control device 1 is automatically brought into a non-driven state even if data input to the input unit 11 by the card 10 is not performed.

Before the operation of the cargo cradle 5 is performed, when the hydraulic control device 1 is in the driving state (S3), the operation operation for raising and lowering the cargo cradle 5 by the operation unit 20 is not input (S4), and the lifting operation is performed. When a predetermined time elapses without being started (S41), the selector switch of the on / off unit 13 is switched to off connection (S10). Further, after the operation of the receiving platform 5 is started (S5), when a state where no operation input of the operation unit 20 is performed elapses for a predetermined time (S61), the changeover switch of the on / off unit 13 is switched off. (S10).

Regarding the above calculation of the predetermined time, the time required to load the load on the receiving platform 5 from the inside of the cargo box or the time required to load the load on the receiving platform 5 from the cart or the like is set to be longer than the time required for the vehicle. It can be set as appropriate depending on the type. For example, at the departure point where goods are sorted and loaded into a vehicle, when all the maximum load capacity to be loaded is unloaded and transported in one place, the time required for one worker to take down the maximum load capacity is reduced. The predetermined time may be set. In addition, the “predetermined time” (S41) set before the start of the operation of the above-described load receiving platform 5 and the “predetermined time” (S61) set after the start of the operation of the load receiving platform 5 are set to the same time, but are different. The length may be set.

In addition, regarding the function of automatically switching the changeover switch of the on / off unit 13 to the off connection when a predetermined time elapses while the operation unit 20 is not input in this manner, for example, the operation end of the cargo receiving platform 5 (S7) data input may be provided to such between steps of (S 8). Further, in the present embodiment, as shown in the figure, the function of setting the hydraulic control device 1 to the non-driven state after a predetermined time has elapsed is provided in the two steps S41 and S61.

  According to the present embodiment, the driving operation of the hydraulic control device 1 can be performed according to the above-described procedure, and when the operator is required to speed up when unloading and transporting the cargo from the cargo box, Switching the drive state or non-drive state of the hydraulic control device 1 can be performed simply by placing the card 10 owned in the vicinity of the input unit 11 of the hydraulic control device 1 disposed in the vicinity of the cargo receiver 5. It is very effective because it can. Further, since the above-described switching can be performed only by the card 10 owned by the operator, the lifting operation of the load receiving table is not performed by a third party without permission. Further, when a predetermined time elapses when the operation signal from the operation unit 20 is not input (leaved) while the hydraulic control device 1 is in the driving state, the hydraulic control device 1 automatically switches to the non-driving state. Even if the person forgets to switch to the non-driving state, the load receiving platform cannot be automatically operated, so that safety can be ensured.

In the present embodiment, the hydraulic control device 1 may be switched to the driving state or the non-driving state other than the unique data of the card 10. Specifically, as shown in FIG. 4, unique data input means (input) that outputs unique data input to the input unit 11 from the determination unit 12 to the control unit 14 between the determination unit 12 and the control unit 14. (Signal output means) F6 may be provided. By providing the unique data input means F6, even when there are a plurality of unique data set and registered in the determination unit 12, the drive state or non-drive state time of the hydraulic control device 1 and switching timing are controlled for each unique data. The part 14 can be stored. As a result, it is possible to manage the work state for each worker having different unique data (card).

In addition, a configuration (see FIG. 5A) for outputting data input to the control unit 14, for example, data such as operation time of the operation unit 20 and the number of times of driving of the hydraulic control device 1 to an external device (such as a personal computer), It is also possible to adopt a configuration (see FIG. 5B) in which the hydraulic control device 1 is provided with a monitor unit 15 for display. By adopting these configurations, it is possible to recognize the aging deterioration status and maintenance execution timing of each component of the hydraulic control device.
(Second Embodiment)
Next, the second embodiment will be described with a focus on differences from the first embodiment. The same apparatus will be described using the same reference numerals for convenience of description.

  As shown in FIG. 6, the present embodiment is different in that a voltage detection unit 16 is arranged in the hydraulic control device 1. The voltage detector 16 is configured to detect the power supply voltage of the vehicle battery 4 (F81) and output the voltage value to the controller 14 (F82).

Further, the off signal input means F51 not only “inputs a signal from the control unit 14 that turns off the changeover switch of the on / off unit 13 when the input signal is not input for a predetermined time”, but also “vehicle It also has the function of “inputting a signal from the control unit 14 that turns off the changeover switch of the on / off unit 13 even when the voltage of the battery 4 becomes smaller than a predetermined value”.

As a result, when the electric energy of the vehicle battery 4 is greatly consumed, it is possible to prevent the electric energy from being further consumed by operating the operation unit 20, and damage to the vehicle battery 4 can be prevented. It can be avoided.

Will be described with reference to FIG switching sequence of the drive state or non-driven state of the hydraulic control device 1 using the voltage detection section 16. Note that FIG. 7 shows the time when the hydraulic control device 1 is in a driving state (a dashed line portion in FIG. 3).

  When the hydraulic control device 1 is switched to the driving state, the voltage detection unit 16 detects the voltage of the vehicle battery 4 (S101, S102). In order to prevent operation of the operation unit 20 as a state in which the amount of electric power of the vehicle battery 4 is largely consumed when the voltage is smaller than a predetermined value, even though the hydraulic control device 1 is not driven, an alarm (see FIG. 6). LED 2) is driven to display to the operator by LED emission (S105), and the switch of the on / off section 13 is turned off to switch the hydraulic control device 1 to the non-driven state. The alarm device may be another light emitting device, a device that emits a sound, or a monitor display (see FIG. 5B).

  When the voltage is equal to or higher than the predetermined value, the vehicle battery 4 allows the operation of the operation unit 20 as having a good electric energy (S4). If the operation input is not continuously performed for a predetermined time in this state (S41), the hydraulic control device 1 is switched to the non-driving state (S10). If the operation input is performed, the cargo receiving platform 5 is activated. (S5). Even if the operation input is performed (S6), when a state occurs in which the operation input is not continuously performed for a predetermined time (S61), the hydraulic control device 1 is switched to the non-driven state (S10). Further, while the operation input is being performed, voltage detection by the voltage detection unit 16 is being performed (S103), and when the voltage is lower than a predetermined value due to excessive operation of the cargo receiving platform 5 or the like. In the same manner, the alarm device is driven (S105), and the hydraulic control device 1 is brought into a non-driven state (S10). On the other hand, if the voltage is maintained at a predetermined value or higher, the hydraulic control device 1 is switched to the non-driven state by the operator performing a stop operation (S7 to S10).

In the present embodiment, when the voltage of the vehicle battery 4 becomes smaller than a predetermined value, the hydraulic control device 1 is switched to the non-driving state. Instead, the setting may be made to switch to the non-driving state when an operation input is made to the control unit 14 a predetermined number of times while the state is smaller than the predetermined value. Further, two steps for performing voltage detection are provided (S102, S104), but only one of them may be provided.
(Third embodiment)
An embodiment different from the first and second embodiments will be described with reference to FIG.

  In the present embodiment, the vehicle battery 4 is directly connected to the hydraulic control device 1 via the first electrical wiring 3 connected to the hydraulic control device 1 and the main switch 30 that is switched on or off via the cab 6. The second electrical wiring 31 is provided.

  The operator has lost the card 10 while having the function of easily switching the driving state or the non-driving state of the hydraulic control device 1 by placing the card 10 close to the input unit 11. In an emergency such as, the driving state or non-driving state of the hydraulic control device 1 can be switched by the switching operation of the main switch 30.

In this embodiment, the hydraulic control device 1 is switched independently when the card 10 is used and when the main switch 30 is used. However, the present invention is not limited to this, and the main switch 1 is turned on. If not connected, the hydraulic control device 1 using the card 10 cannot be switched. With this configuration, the switching operation for bringing the hydraulic control device 1 into the driving state is required twice before the operator operates the load receiving platform 5, such as preventing unauthorized operation by a third party and preventing erroneous operation. Safety can be improved in terms of safety.
(Fourth embodiment)
An embodiment different from the first to third embodiments will be described with reference to FIG.

  In the present embodiment, the lifting operation of the load receiving platform 5 is performed in response to a command from the wireless operation unit 20a operated by the operator. The wireless operation unit 20a includes a unique data storage unit (IC chip or the like) 201 having unique data for driving the hydraulic pressure control device 1, and an operation for outputting a command for raising and lowering the load receiving platform 5 by a wireless signal R1. A data output unit 202 is provided. The drive of the hydraulic control device 1 is controlled by the unique data storage unit 201 being arranged close to the input unit of the hydraulic control device 1, and the output from the operation data output unit 202 is an operation performed by the operator (SW1, SW2). The operation is performed based on

The wireless operation unit 20a is configured to serve as both a device for putting the hydraulic control device 1 in a driving state and a device for operating the cargo receiver 5 and is preferable in terms of management. In addition, although the operation of raising and lowering the cargo receiving platform 5 is performed only by the wireless operation unit 20a, a configuration having an operation unit connected to the hydraulic control device 1 by wire as in the first to third embodiments. Or it is good also as a structure provided in hydraulic control device 1 itself. In the case where the operation unit is connected to the hydraulic control device 1 by wire, a configuration in which the unique data storage unit 201 is provided in the connected operation unit is also possible.
(Other matters)
Although different embodiments have been described in the first to fourth embodiments, a configuration in which these are combined may be used.

  Further, the wireless communication range between the card 10 and the input unit 11 is arranged close to each other. However, the range is not limited to the close range as long as the signal from the card 10 is input to the input unit 11. . Moreover, it is not limited to the form in which the output signal from the card 10 is sensed by being arranged close to each other, but a contact-type form may be used. In addition, regarding portable devices that are close to the input unit, such as the card 10 or the wireless operation unit 20a, as long as the size is portable for the worker, such as a card or a device operated by the worker, other forms are possible. Also good. What is carried by the operator is not limited to the one that outputs a signal to the input unit 11 in response to the electromagnetic wave output from the input unit 11, but the one that directly outputs the signal from the portable device to the input unit 11 is also applicable. .

  Further, regarding the configuration of the input unit, in addition to the configuration in which the cards 10 are arranged close to each other, a configuration in which unique data is directly input, a configuration such as fingerprint authentication, voice determination, and image authentication can be employed.

  According to the present invention, it is useful for all kinds of load receiving platform lifting devices provided with a hydraulic control device.

DESCRIPTION OF SYMBOLS 1 Hydraulic control apparatus 2 Cargo box 3 Electric wiring 4 Vehicle battery 5 Cargo stand 6 Vehicle cab (cab)
10 Card 11 Input Unit 12 Determination Unit 13 On / Off Unit 14 Control Unit 15 Monitor Unit 16 Voltage Detection Unit

Claims (6)

Lifting and lowering of the load receiving platform, which is provided at the rear of the vehicle and moves up and down between the loading platform and the ground, and a hydraulic control device having a control unit that is driven by electric power from the vehicle battery and controls the lifting and lowering operation of the load receiving platform. A device,
In the hydraulic control device,
An input unit for receiving a switching command for switching the hydraulic control device to a driving state in which electric power is supplied from the vehicle battery or a non-driving state in which the electric power supply is interrupted, and an output signal from the input unit A determination unit that determines switching between the driving state and the non-driving state, and an on / off unit that performs on / off of power supply from the vehicle battery to the control unit,
Further, the determination unit is provided with an off signal input means for inputting a switching signal from the driving state to the non-driving state from the control unit,
The on / off unit is controlled on / off based on an output signal from the input unit or the switching signal. 2. The switching signal is input to the off signal input unit when a state in which the lifting operation of the load receiving table is not performed via the control unit is continued for a predetermined time. Loading platform lifting device. The vehicle battery for making the driving state is connected to the hydraulic control device,
The cargo receiving platform elevating device according to claim 1, wherein the switching signal is input to the off signal input means when a voltage value of the vehicle battery becomes smaller than a predetermined value. The cargo receiving platform elevating device according to any one of claims 1 to 3, wherein the determination unit is provided with input signal output means for outputting information of the switching command to the control unit. The input to the input unit is performed by placing a portable device having a unique authentication code close to the input unit. The load receiving table lifting device according to any one of claims 1 to 4. The said portable machine has an operation part which operates the raising / lowering operation | movement of the said load receiving stand. The load receiving stand raising / lowering apparatus of Claim 5 characterized by the above-mentioned.

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