JP2017088129A - Cargo receiving table lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo receiving table lifting device contributable to restraint of the occurrence of its secular change, by leading to grasping of the timing and an operation state of causing the secular change.SOLUTION: A cargo receiving table lifting device comprises a cargo receiving table liftably provided to a vehicle, a lifting operation part for lifting the cargo receiving table, a hydraulic driving part capable of supplying-discharging a hydraulic fluid to the lifting operation part and a control part 6 capable of controlling supply-discharge of the hydraulic fluid in the hydraulic driving part, and the control part 6 comprises an input part 61 for inputting an operation signal of lifting operation, a detection part 65 for detecting at least one among an operation state of the lifting operation part and a driving state of the hydraulic driving part, a storage part 66 connected to the detection part 65 and an output part 67 connected to the storage part 66 and capable of outputting to an external part. Among the operation state or the driving state, at least one can be outputted to external equipment by the output part 67.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a load receiving table lifting device mounted on a vehicle, and more particularly to a control unit that controls the lifting operation of the load receiving table.

The loading platform lifting device is mainly mounted on the rear part of the vehicle, and can lift the loading platform between the floor surface of the loading platform and the ground. In many cases, the lifting operation of the load receiving platform is performed via a wired or wireless operation unit that is held by an operator. For example, an operation signal output from the operation unit is received by a control unit provided on the vehicle side, and the control unit controls the lifting operation of the load receiving table based on the received signal.
Such a control unit is not only improved in performance but also made compact (for example, Patent Document 1), and is useful for controlling the operation of a good load receiving platform.

  As the control unit becomes higher performance and its convenience is improved, users who are accustomed to high convenience feel more inconvenienced by a slight decrease in performance. The importance of management increases as well.

  Therefore, in order to perform maintenance management, not only chronological management, but a notification device is installed to inform the operator that the cargo receiving platform lifting / lowering device has actually been operated, specifically, the number of times the cargo receiving platform has been lifted / lowered has reached a predetermined number. (For example, Patent Document 2).

JP 2006-272989 A Japanese Patent No. 5527876

However, it is difficult to grasp at what timing the secular change has occurred or what kind of operation has occurred when the notification device is activated in accordance with actual operation. .
Therefore, even if maintenance can be performed as appropriate, the operation to be avoided in the future cannot be specified, and the same secular change cannot be prevented.

  In particular, since the load receiving platform elevating device is mounted on a vehicle, the work is often performed outside the room, and the usage situation such as a change in the stop position of the vehicle and the external environment is not unified at all. That is, the secular change does not progress at the same rate in time series, and may occur suddenly.

  The present invention has been made in view of these points, and it is an object of the present invention to provide a load receiving platform lifting / lowering device that can contribute to the suppression of the occurrence of secular change, which leads to grasping the timing and operation status of the secular change.

  In the present invention, a load receiving base provided so as to be able to move up and down with respect to the vehicle, an elevating operation unit that elevates and lowers the load receiving base, a hydraulic drive unit capable of supplying and discharging hydraulic oil to and from the elevating operation unit, and the hydraulic drive The following means are used for a load receiving table lifting device including a control unit capable of supplying and discharging hydraulic oil in the unit.

  The control unit includes an input unit to which an operation signal for the lifting operation is input, a detection unit that detects at least one of an operation state of the lifting operation unit and a driving state of the hydraulic drive unit, and a detection unit A storage unit connected to the storage unit; and an output unit connected to the storage unit and capable of outputting to the outside. The output unit causes at least one of the operating state or the driving state to be an external device. Output is possible.

At this time, the raising / lowering operation unit includes a hydraulic cylinder that expands and contracts by supplying and discharging the hydraulic oil, and the hydraulic drive unit includes a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder and a motor that drives the hydraulic pump. The detection unit includes at least one of a temperature detection unit that detects a temperature of the motor or a temperature of hydraulic oil, and a voltage detection unit that detects a battery voltage that supplies power to the motor. Have.
The detection unit may include a number measurement unit that measures the number of times the hydraulic drive unit is driven.

Furthermore, an operation unit capable of outputting an operation signal to the control unit is provided, the control unit includes a reception unit that receives the operation signal, and the frequency measurement unit is connected to the reception unit. It is good also as what is comprised by the reception detection part which detects the presence or absence of reception of the said operation signal.
As another means, the number-of-times counting unit may be configured by a motor drive detection unit that measures the number of times the motor is driven.

  In addition, since the storage unit described above has a configuration in which a timer is connected, the operation time of the hydraulic drive unit and the like can be grasped more accurately. This will help you understand when the problem occurs.

  According to the load receiving platform lifting apparatus of the present invention, the control unit includes the detection unit that detects the operating state of the lifting operation unit, and the storage unit that is connected to the detection unit. Input to the storage unit is possible. And since it also has an output unit that is connected to the storage unit and outputs to the outside, the data stored in the storage unit can be obtained by connecting an external device that can read the data stored in the storage unit to the output unit. In other words, it is possible to confirm the data detected by the detection unit. By performing this data confirmation, it is also possible to specify what kind of operation is performed on the cargo receiving platform lifting device when the detection data changes. As a result, it is possible to avoid an operation that causes a significant secular change in the load receiving table lifting device.

It is a side view which shows the load receiving stand pull-out operation | movement of the load receiving stand raising / lowering apparatus which concerns on embodiment of this invention. It is a hydraulic circuit diagram of the load receiving table lifting device according to the embodiment of the present invention. It is a functional block diagram which shows the control part and operation part of the cargo receiving stand raising / lowering apparatus which concern on embodiment of this invention. FIG. 6 is a timing chart regarding operation control of the load receiving drawer and operation control of pulling in the load receiving platform in the load receiving platform lifting apparatus according to the embodiment of the present invention.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a load box B mounted on a vehicle and a load receiving platform lifting device 100 mounted below the load box B at the rear of the vehicle. The load receiving platform lifting / lowering device 100 is used by pulling the load receiving stand 1 from the lower side of the load box B toward the vehicle rear side in order to place the load for loading and unloading the load.

  In FIG. 1, the load receiving platform lifting / lowering device 100 changes from the housed state to a state in which luggage can be loaded and unloaded in the order of FIGS. 1 (a) to 1 (e), and operates the changed state. The operation unit R1 used by the operator is also displayed. In this figure, the left side is the front side of the vehicle, the right side is the rear side of the vehicle, and the buttons of the operation unit R1 pressed in each operation are displayed in a color-changed manner.

  FIG. 1A shows the load receiving table lifting device 100 in the storage position. This storage position indicates a state in which the load receiving platform lifting device 100 is stored in a state where the vehicle can travel, and is drawn slightly toward the front side of the vehicle from the rear end of the cargo box B as illustrated. In addition, the load receiving table elevating device 100 in the storage position also functions as a vehicle bumper.

  The load receiving platform lifting device 100 is provided at the rear of the vehicle frame C with the longitudinal direction of the vehicle in the longitudinal direction, below the load box B mounted on the vehicle frame C, and can be folded and unfolded. And an elevating operation unit S that elevates and lowers the load receiving platform 1. The elevating operation unit S includes a slide drive unit 2 that moves the load receiving table 1 in the vehicle front-rear direction and an elevating drive unit 3 that moves the load receiving table 1 up and down. The load receiving table lifting device 100 is also provided with a control unit (not shown) that controls the driving of the driving units 2 and 3. The load receiving platform 1, the slide drive unit 2, and the elevating drive unit 3 have a known configuration (for example, JP 2013-208942 A), and can move the load receiving platform 1 in the vehicle front-rear direction or the vertical direction.

  The slide drive unit 2 includes a pair of left and right guide rails 21, left and right sliders 22, a connecting member 23, and left and right slide cylinders 24. The guide rail 21 is attached to the lower side of the vehicle frame C with the front-rear direction as the longitudinal direction. The slider 22 is engaged and supported by the guide rail 21 and slides along the guide rail 21. The connecting member 23 is mounted on the left and right sliders 22. Each end of the slide cylinder 24 is fixed to the guide rail 21 and the slider 22, and the slider 22 slides back and forth as the slide cylinder 24 expands and contracts. 23 also moves back and forth.

  The elevating drive unit 3 includes a left and right pair of a tilt arm 31, a lift arm 32, a compression arm 33, and a lift cylinder 34, respectively. The tilt arm 31 is rotatably connected to a bracket (not shown) whose upper end is fixed to the connecting member 23. The lift arm 31 is rotatably connected to the tilt arm 31 at the front end and to the load receiving platform 1 at the rear end. The compression arm 33 has a front end portion connected to the bracket and a rear end portion rotatably connected to the load receiving platform 1. The lift cylinder 34 is connected to the lower end portion of the tilt arm 31 on the rod side and to the lift arm 32 on the bottom side so as to be rotatable. The lift arm 32 and the compression arm 33 form a parallel link that connects the load receiving platform 1 to the slider 22 so as to be movable up and down, and the parallel link is driven to rotate up and down as the lift cylinder 34 extends and retracts to receive the load. The table 1 moves up and down while maintaining a horizontal posture.

  As shown in FIG. 1B, when pulling the load receiving platform 1 from the storage position to the vehicle rear side, the slider 22 is slid to the vehicle rear side along the arrow A1 by pressing the “down” button of the operation unit R1. . At this time, the load receiving platform 1 moves from the rear end portion of the packing box B to the first pull-out position protruding by a distance L1 (about 100 mm) toward the vehicle rear side.

  When the load receiving platform 1 reaches the first pull-out position and the “down” button is pressed as it is, the load receiving platform 1 is lowered along the arrow A2 as shown in FIG. And it moves to the 1st descent position which descended slightly so that it may leave the packing box B.

  When the cradle 1 reaches the first lowered position, if the “down” button is pressed as it is, the cradle 1 slides along the arrow A3 toward the rear side of the vehicle as shown in FIG. Then, it moves from the rear end portion of the cargo box B to the rear side of the vehicle by a distance L2 and moves to a second pull-out position where the load receiving platform 1 can be moved up and down.

  Further, when the “down” button is continuously pressed as it is, the load receiving platform 1 descends along the arrow A4 as shown in FIG. And it arrives at the 2nd descent | fall position where the load receiving stand 1 grounded. When the load receiving platform 1 reaches the second lowered position, the operator stops pressing the “down” button, and the “<”-shaped load receiving platform 1 is manually deployed horizontally (not shown). To.

This pull-out operation moves the load receiving platform 1 from the storage position to the ground position only by pressing the “down” button, and is a simple operation method for the operator. Then, when the “up” button of the first operation unit R1 is pressed, the load receiving platform 1 can be raised while being unfolded and kept in a horizontal posture. Further, when returning the load receiving platform 1 to the storage position after using the load receiving platform lifting / lowering device 100, the operator manually folds the bag into the above-mentioned "<" shape and then presses the "Up" button on the operation unit R1. Thus, the pulling-in operation that is the opposite of the above-described pulling is continuously performed.
The load receiving table lifting device 100 capable of such an operation includes a hydraulic drive unit (power unit) 4 shown in FIG.

  The hydraulic drive unit 4 includes an electric motor 41, a hydraulic pump 42 driven by the electric motor 41, an oil tank 43 provided on the suction side of the hydraulic pump 42, and pressure oil in the discharge pipe 4 a of the hydraulic pump 43 to the lift cylinder 34. The first pressure oil supply passage 4b to be supplied, the control valve for raising operation 44 for communicating or blocking the flow of the first pressure oil supply passage 4b, and the branch from the downstream side of the control valve for raising operation 44 in the first pressure oil supply passage 4b. The pressure oil return passage 4c connected to the oil tank 43, the lowering control valve 45 for communicating or blocking the flow of the pressure oil return passage 4c, the flow rate control valve Fv provided downstream of the lowering control valve 45, A main relief valve Rm for defining the maximum discharge pressure of the hydraulic pump 42 and a contactor relay (not shown) interposed between the electric motor 41 and a battery (not shown) are provided. In the present embodiment, the ascending operation control valve 44 and the descending operation control valve 45 constitute a lift cylinder control valve that controls the flow of pressure oil from the hydraulic pump 42 to the lift cylinder 34.

  In accordance with an operation signal from the operation unit R1, power supply control from the battery to the electric motor 41 is performed via the contactor relay, and the hydraulic pump 29 is driven. At the same time, a drive command signal is appropriately input to the solenoid portions 44 s and 45 s of the control valves 44 and 45, pressure oil supply / discharge control from the hydraulic pump 29 is performed, and the lift cylinder 34 expands and contracts. As the lift cylinder 34 expands and contracts, the load receiving platform 1 is moved up and down.

  Further, the hydraulic drive unit 4 is branched from the discharge pipe 4a of the hydraulic pump 41 and connected to the rod side of the slide cylinder 24. The throttle valve V provided in the second pressure oil supply passage 4d and the second pressure oil supply passage 4d. And a check valve Rv, a third pressure oil supply passage 4e branched from the second pressure oil supply passage 4d and connected to the bottom side of the slide cylinder 24, and a control for a drawing operation for communicating or blocking the flow of the pressure oil supply passage 4e. The valve 46 and the pulling-in operation for communicating or blocking the flow of the pressure oil return passage 4f branched from the third pressure oil supply passage 4e and in contact with the oil tank 43 on the downstream side of the control valve 46 for drawing operation and the pressure oil return passage 4f An operation control valve 47 is provided.

  In response to the operation signal from the operation unit R1, the electric motor 41 and the hydraulic pump 42 are driven via the contactor relay, whereby a drive command signal is input to the solenoid unit 46s of the pull-out operation control valve 46. At this time, since the pull-in operation control valve 47 is in the shut-off position, the pressure oil from the hydraulic pump 42 is supplied to the bottom side of the slide cylinder 24 via the third pressure oil supply passage 4e, and the load receiving platform 1 is located on the vehicle rear side. Slide to. On the other hand, the sliding operation toward the front side of the vehicle is also driven by the solenoid unit 47s of the pull-in operation control valve 47 by driving the electric motor 41 and the hydraulic pump 42 via the contactor relay in response to the operation signal from the operation unit R1. Command signal is input. At this time, since the pull-out operation control valve 46 is in the shut-off position, the pressure oil from the hydraulic pump 42 is supplied to the rod side of the slide cylinder 24 via the pressure oil supply passage 4c, and the pressure from the bottom side of the slide cylinder 24 is Oil flows out to the oil tank 43 through the pressure oil return passage 4f. As a result, the slide cylinder 24 contracts and the load receiving platform 1 slides forward of the vehicle.

  In the present embodiment, the pressure oil return passage 4f is branched from the discharge pipe 4a to a position upstream of the pull-out operation control valve 46 and the pull-in operation control valve 47 on the downstream side of the main relief valve Rm. A bypass passage 4g connected to the. A sub-relief valve Rs and a switching valve 48 are provided in the bypass passage 4g. The switching valve 48 is controlled to communicate or shut off the pressure oil to the sub relief valve 73 by a drive signal to the solenoid drive unit 48s. The sub-relief valve Rs has a relief pressure (for example, about 6 MPa) set lower than a relief pressure (for example, about 20 MPa) of the main relief valve Rm, and the switching valve 48 is switched to the communication position to enter the discharge pipe 4a. When connected, the maximum value of the pressure oil in the discharge pipe 4a is regulated to a value lower than the relief pressure of the main relief valve Rm.

  The discharge pipe 4 a is provided with a pressure sensor 54 that detects that the load receiving table 1 is pressed against the guide rail 21. When the lift cylinder 34 extends and the load receiving platform 1 comes into contact with the guide rail 21, the pressure in the discharge pipe 4a increases. If the pressure sensor 54 detects that this pressure has exceeded a predetermined value, it can be determined that the load receiving platform 1 is in contact with the guide rail 8.

  Further, although not shown in the present embodiment, other sensors are also used. The guide rail 21 is also provided with a rear end sensor, a storage sensor, and a position sensor. The guide rail 21 is provided with front and rear stoppers (not shown) that restrict the movement range of the slider 22 in the front-rear direction.

  The rear end sensor is detection means for detecting whether or not the rear end sensor is in a position in contact with the stopper on the rear side of the slider 22 (hereinafter referred to as “rear end position”). The storage sensor has the slider 22 on the rear end position side from a predetermined position (hereinafter referred to as “intermediate position”) between a position where the slider 22 contacts the stopper on the front side (hereinafter “front end position”) and a rear end position. Detecting means for detecting whether or not. And a position sensor drives based on the operation signal from 2nd operation part R2, when an operator mounts a leg and uses the load receiving stand 1 as a step member, and it is a rear end position rather than the said intermediate position. It is a detection means which detects whether the slider 22 exists in the side. For these sensors, proximity sensors, limit switches, and the like can be used.

In addition, the above-described foldable load receiving platform 1 is provided with a folding sensor for detecting the posture (folded state) of the load receiving platform 1 at the folding hinge, and the load receiving platform 1 is detected by the detection of the folding sensor. Is determined to be in the first lowered position.
FIG. 3 is a functional block diagram illustrating a configuration example of the control unit 6 provided in the cargo receiving platform lifting apparatus 100 together with peripheral devices.

  The control unit 6 is connected to the folding sensor 51, the storage sensor 52, the rear end sensor 53, the pressure sensor 54, and the position sensor 71 described above. And the control part 6 is the input part 61 into which the output signal of these sensors 51-54,71 is input, the receiving part 62 which receives the operation signal from operation part R1 with respect to the load receiving table raising / lowering apparatus 100, and the input part 61 and a receiving unit 62, a calculation unit (CPU) 63 that can execute calculation processing according to a control program and instruct the operation of each cylinder 24, 34 (see FIG. 2), and a command signal generated by the calculation unit 63 Are provided with solenoid parts 44s to 48s of the control valves 44 to 48 and a command part 64 that appropriately outputs to the contactor relay CT. Furthermore, the control part 6 is connected to the detection part 65 which detects the motor M and each sensor 51-54, 71 etc. which are required for control of the raising / lowering operation | movement of a receiving stand or a slide operation | movement, and the detection part 65, and the detection part 65 is connected. A storage unit 66 that stores the detection data output from the storage unit 66 and a data output unit 67 that is connected to the storage unit 66 and can output storage data stored in the storage unit outside.

  The detection unit 65 includes a temperature detection unit 65a that detects the temperature of the motor M, a voltage detection unit 65b that detects the voltage of the battery B, a magnetic field detection unit 65c that detects the magnetic field state of each solenoid 44s to 48s, and a reception unit. 62 includes a reception detection unit 65d that detects whether or not an operation signal from the operation unit R1 has been received. By having these detection units 65a to 65d, when the temperature of the motor M becomes equal to or higher than a predetermined value, the detection data is output to the storage unit 66 and stored (accommodated). The temperature detection unit 65a may detect the temperature of the hydraulic oil instead of the motor M.

  In the load receiving table lifting apparatus 100 according to the present embodiment, as described above, the “down” button is continuously pressed when the load receiving table 1 is pulled out, so that the motor driving time is also relatively long. Further, there are many changes in operation (see FIG. 1), and switching of the excitation states of the solenoids 44s to 48s is performed in a relatively short time. Furthermore, the lifting and lowering operation of the load receiving platform 1 is often repeated with a dock shelter or the like, and the time for the battery B to be in the conductive state is prolonged even when the vehicle is stopped for a long time. In addition, when a notification device is provided as in Patent Document 2, if the lifting operation of the load receiving platform 1 is continued despite the operation of the notification device, the lifting operation unit S or hydraulic pressure is continued. An excessive burden is also applied to the drive unit 4. In these cases, each of the detection units 65a to 65d can detect and store the information in the storage unit 66 if the operation needs to be stopped or maintenance is required. Since the data output unit 67 is connected to the storage unit 66, if an external device having a data reading function such as a personal computer is connected to the data output unit 67, the operator can stop the operation even after the fact. It is possible to check whether or not a necessary condition has occurred. In other words, the overload state of each detection target member can be monitored by each of the detection units 65a to 65d, and it is useful for grasping under what conditions or circumstances the overload state is established. In the present embodiment, the signal output from the detection unit 65 to the storage unit 66 is a numerical value in which the detection index of each detection target member (for example, the temperature of the motor M, the rate of temperature increase at a predetermined time, etc.) is set in advance. The data is based on whether the data is large or not.

  The detection unit 65 also includes a frequency measurement unit 650 that measures the number of times the hydraulic drive unit is driven. In the frequency measurement unit 650, the reception unit 62 detects the presence or absence of an operation signal from the operation unit R1. A reception detection unit 65d for measuring the number of times and a motor drive detection unit 65e for detecting the driving of the motor M and measuring the number of times of driving.

  The reception data of the reception detection unit 65d is output to and stored in the storage unit 66, so that the operator presses the raising button 5b and the lowering button 5c for the hydraulic control unit 4 to raise and lower the load receiving platform 2. The pressed information and the detection information of the temperature detection unit 65a such as the temperature of the motor M, the voltage detection unit 65b, or the magnetic field detection unit 65c can be checked in correlation.

  In addition, the reception data of the motor drive detection unit 65e is also output and stored in the storage unit 66, so that the operator can similarly detect the number of times the motor M is driven and the voltage detection unit 65b or the magnetic field detection unit 65c. Information can also be checked in a correlated manner.

  Further, since a timer is connected to the detection unit 65 and the storage unit 66, the drive time (signal input time) or time based on the input of signals from the respective detection target members and the reception unit 62 is also stored in the storage unit 66. Can be stored.

  Various data stored in the storage unit 66 can be used for verification and analysis of detected data by connecting a personal computer or the like, for example. In particular, since the detection unit 65 includes the reception detection unit 65d, it is also possible to calculate the number of times the cargo receiving platform 1 is moved up and down based on the number of input operation signals from the operation unit R1. Therefore, not only the detection information from the temperature detection unit 65a and the voltage detection unit 65b is stored in the recording unit 66, but also how many times the detection information has been detected is detected. Can be confirmed. As a result, it is possible to specifically grasp how much the aging change occurs when the number of times of ascending and descending is used. That is, a predetermined number of times of raising and lowering is set, and it is not only grasping whether or not the actual number of times of raising and lowering the cargo receiving platform 1 has reached the predetermined number of times of raising and lowering, but before the predetermined number of times is reached, there is actually a secular change. Since it can also be grasped whether or not it has occurred, it leads to an improvement in the setting accuracy of the “predetermined number of times of raising / lowering” itself. In addition, by collating with the actual number of times of raising and lowering, the worker can also remember where he / she worked and can also grasp the quality of the work environment. Furthermore, since the timer T is also provided in the present embodiment, not only the number of times of raising / lowering but also the driving time can be accurately grasped, so the place where the vehicle stopped (where it was worked) and how much It is preferable because it is easy to grasp whether continuous driving has been performed.

  In the present embodiment, as described above, the reception detection unit 65d and the motor drive detection unit 65e are provided, so that the number of times of raising and lowering the load receiving platform 1 is input to the operation unit R1 (operation in which the operator presses a button). Although it is calculated based on this, even if it is a configuration in which only at least one of the reception detection unit 65d and the motor drive detection unit 65e is provided, the same effect can be obtained.

  As described above, when the cargo receiving platform 1 is raised, the motor M is driven by pressing the upper button, and when the cargo receiving platform 1 is lowered, the driving of the motor M is stopped by pressing the lower button. State. At this time, when the motor M is continuously driven for 3 seconds or more, it is measured as “one drive”, and when the upper button is continuously pressed for 3 seconds or more, “one rise”, Further, when the button is continuously pressed for three or more lines, it is specifically measured as “one descent”.

In the load receiving platform lifting / lowering apparatus 100 of the present embodiment, the operation control of the pulling out and the pulling in of the load receiving platform 1 through the control unit 6 is also performed, and the operation control will be described with reference to the timing chart of FIG.
First, the pulling-out operation of the cargo receiving platform 1 is as shown in FIG.

  After the main switch provided in the cab is turned on, when the operator presses the “down” button of the first operation unit R1, the conductor relay is energized to drive the electric motor 41 and the solenoid unit 46s. Is excited and the slide cylinder 24 is extended. At this time, the solenoid 47s is excited at the same time, and the pull-in operation control valve 47 is brought into communication only for an instantaneous period, so that noise generated when the slide cylinder 24 is extended can be suppressed. In the storage position, since the load receiving platform 1 is pressed against the guide rail 21, a slight pressure release is also performed to excite the solenoid portion 45s so that the operation on the rear side of the vehicle (first pulling operation) is not hindered by friction or the like. Is done by. A determination is made based on the signal from the storage sensor 52 while the cargo receiving platform 1 is being pulled out. Until the signal of the storage sensor 52 is OFF and the slider 22 reaches the intermediate position, the slider 22 is pulled out only while the “down” button is pressed, and when the “down” button operation is released, the slider 22 is stopped. .

  In the first lowering operation control, when the slider 22 reaches the intermediate position, the retracting sensor 52 is switched to OFF, so that the pulling operation control valve 46 is closed and the pulling operation of the slider 22 is stopped. Then, the electric motor 41 and the hydraulic pump 42 are stopped and the lowering control valve 45 is opened to lower the load receiving platform 1. During the first lowering operation, it is determined based on the signal from the folding sensor 51 whether the cargo receiving platform 1 has been lowered to a predetermined height. When the signal of the folding sensor 51 is switched to OFF, the operation is stopped.

  If the “down” button is pressed when the first lowering operation is stopped, the process proceeds to the second pulling-out operation. The electric motor 41 is driven again, and the pull-out operation control valve 46 is opened to pull out the slider 22. While the slider 22 is being pulled out, it is determined based on the signal from the rear end sensor 53 whether the slider 22 has reached the rear end position. When the signal of the rear end sensor 53 is switched ON, the operation is stopped.

Then, when the second pull-out operation is stopped, if the “down” button is pressed, the operation proceeds to the second lowering operation. At this time, the electric motor 41 and the hydraulic pump 29 are stopped and the lowering control valve 45 is opened to lower the load receiving platform 1 again. This lowering operation is continued while the operation signal is input from the “down” button. When the cargo receiving platform 1 is grounded and the operator stops the lowering operation, the lowering operation is stopped.
Next, the pull-in operation of the cargo receiving platform 1 is as shown in FIG.

  When performing this pulling-in operation, an operator manually folds the load receiving platform 1 into a “<” shape in advance at the ground contact position. Thereafter, the “up” button of the first operation unit R1 is pressed. When the “up” button is pressed, a first ascending operation signal is input, the conductor relay is energized to drive the electric motor 41, and the ascent operation control valve 44 is opened to raise the load receiving platform 1 ( First rise). At this time, the pull-out operation control valve 46 is opened together with the lift-up operation control valve 44, and the load receiving platform 1 is raised from the grounding position while the slider 22 is in the rear end position. While the load receiving platform 1 is in the first ascending operation, whether or not the load receiving platform 1 has reached a predetermined height, specifically, whether or not the angle of the load receiving platform 1 (the hinge portion thereof) has reached the set angle. The determination is based on the signal from the folding sensor 51. Until the load receiving stand 1 reaches the predetermined height, the load receiving stand 1 is raised only while the “up” button is pressed, and when the operation is released, the load receiving stand 1 is stopped.

  In the first ascending operation control, when the load receiving platform 1 reaches a predetermined height, the folding sensor 51 is switched ON, the ascending operation control valve 44 is closed, and the lifting operation of the load receiving platform 1 is stopped. The When the “up” button is pressed, the pull-in operation control valve 47 is opened, and the slider 22 is pulled in while the load receiving platform 1 is held at the predetermined height. At this time, it is preferable to release the pressure of the slide cylinder 24 and the lift cylinder 34 by opening the pull-in operation control valve 47 and simultaneously opening the pull-out operation control valve 46 for a short time. During the first pull-in operation, it is determined based on the signal from the storage sensor 52 whether the slider 22 has reached the intermediate position. When the signal of the storage sensor 52 is switched ON, the operation is stopped.

  When the first pull-in operation is stopped, if the “up” button is pressed, the operation proceeds to the second ascending operation. When the slider 22 reaches the intermediate position, the pull-in operation control valve 47 is closed so that the pull-in operation (first pull-in operation) of the slider 22 is stopped, and the switching valve 48 is switched to the communication position to reduce the relief pressure. Switch to low relief pressure by relief valve Rs. Thereafter, the lifting operation control valve 44 is opened, and the load receiving platform 1 is raised again while the slider 22 is in the intermediate position. When the re-raising of the load receiving platform 1 is started, the relief pressure is not strictly reduced to the relief pressure by the sub-relief valve Rs at the time when the ascent is resumed, and the sub-relief valve Rs can be operated in a circuit. It ’s fine. During the second ascending operation, it is determined based on the signal from the pressure sensor 54 whether the load receiving platform 1 has reached an appropriate height. When the signal of the pressure sensor 54 is switched to ON, the operation is stopped. In the second raising operation, the pressing force acting between the load receiving platform 1 and the guide rail 21 is excessively increased by lowering the relief pressure of the hydraulic circuit to the low relief pressure by the sub relief valve Rs during the operation. Absent.

  And when the 2nd raising operation is made into a stop state, it shifts to the operation of the 2nd pull-in. When the detection signal from the pressure sensor 54 is input by the second ascending operation, and the detection signal recognizes that the contact pressure is equal to or higher than a predetermined pressure (for example, 40 MPa), the load receiving platform 1 reaches the height of the storage position. Recognize that. At this time, the ascent control valve 44 is closed to stop the ascending operation of the load receiving platform 1, and the slider 22 is held while holding the load receiving platform 1 at the retracted height, triggered by the contact of the load receiving platform 1 with the guide rail 21. Let them pull in.

  The second pull-in operation is an operation that is automatically instructed by the control unit 6 when the second ascending operation is completed (recognizing that the load receiving table 1 is in contact with the guide rail 21). Regardless of whether or not the first operation portion R1 is operated, the pull-in operation control valve 47 is opened and the slider 22 is pulled in. At this time, the switching valve V is closed with a slight delay (for example, 500 ms) from the time when the pull-in operation control valve 47 is opened, and the relief pressure of the hydraulic circuit is restored to the relief pressure by the main relief valve Rm. This is because the contact pressure of the load receiving platform 1 with respect to the guide rail 21 is weakened at the start of the second pull-in operation. After the load receiving platform 1 is pulled into the storage position in this way, the control unit 6 stops the electric motor 41 and the hydraulic pump 42, determines whether the power is turned off, confirms that the power is turned off, and ends the pull-in operation.

In such a drawing operation and a pulling-in operation, the motor driving state is measured twice by continuing to press the upper button once, and the motor driving state is measured once by continuing to press the lower button once. Therefore, if it is the detection part 65 and the frequency | count count part 650 which have both the reception detection part 65d and the motor drive detection part 65e, various data can be stored in the memory | storage part 66, and it was stored by the temperature detection part 65a etc. Data can be verified in a multifaceted and complex manner, which contributes to an improvement in the maintenance effect of the load receiving table lifting device 100. Of course, even if only one of the reception detection unit 65d and the motor drive detection unit 65e is provided, it contributes to measuring the number of times the hydraulic drive unit is driven, thus contributing to the improvement of the maintenance effect. .

  As described above, in the present embodiment, not only the operation command for the load receiving platform 1 but also the presence / absence of secular change of the lifting / lowering operation unit S that operates the load receiving platform 1 and the hydraulic drive unit 4 can be grasped. Compared to the case where the history of aging is simply listed, it is possible to determine whether or not the portion where aging has occurred has been handled, whether to use excessively burdened, or even priority. Since it is possible to determine a portion to be maintained, it is possible to feed back such determination information to an operator and the like, leading to improvement in the accuracy of maintenance for the worker and prevention of unnecessary cost increase.

  In the present embodiment, the load receiving platform elevating device 100 in which the load receiving platform 1 is accommodated under the load box B is described, and the drawing operation and the pulling operation are illustrated in FIG. It is good also as a load receiving table raising / lowering apparatus which performs each pulling-out operation | movement, or each pulling-in operation | movement and raising operation | movement. In addition, the load receiving platform 1 is not stored below the packing box B, and a state in which the receiving stand 1 stands up behind the packing box B may be set to the storing posture. Furthermore, the load receiving platform 1 is not lifted or lowered by the tilt arm 31 or the lift arm 32, but may be lifted in the vertical direction along a pair of left and right posts erected at the rear of the vehicle.

  The present invention is useful for all loading platform lifting devices that control the lifting operation of the loading platform via the control unit.

DESCRIPTION OF SYMBOLS 100 Cargo stand raising / lowering device 1 Cargo stand 2 Slide drive part 3 Lift drive part 4 Hydraulic drive part 6 Control part B Cargo box C Frame R1 Operation part 61 Input part 62 Reception part 63 Calculation part 64 Command part 65 Detection part 66 Storage part 67 Data output unit 650 Count measurement unit 65a Temperature detection unit 65b Voltage detection unit 65c Magnetic field detection unit 65d Reception detection unit 65e Motor drive detection unit M Motor B Battery

Claims (6)

A load receiving base provided so as to be able to move up and down with respect to the vehicle, an elevating operation unit that elevates and lowers the load receiving base, a hydraulic drive unit capable of supplying and discharging hydraulic oil to and from the elevating operation unit, and hydraulic oil in the hydraulic drive unit A load receiving and lifting device including a control unit capable of controlling the supply and discharge of
The control unit includes an input unit to which an operation signal for the lifting operation is input, a detection unit that detects at least one of an operation state of the lifting operation unit and a driving state of the hydraulic drive unit, and a detection unit A connected storage unit, and an output unit connected to the storage unit and capable of outputting to the outside,
The output stage can output at least one of the operating state and the driving state to an external device. The lifting and lowering operation unit has a hydraulic cylinder that expands and contracts by supplying and discharging the hydraulic oil,
The hydraulic drive unit includes a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder, and a motor that drives the hydraulic pump.
The detection unit includes at least one of a temperature detection unit that detects the temperature of the motor or the temperature of hydraulic oil, and a voltage detection unit that detects a battery voltage that supplies power to the motor. The load receiving table elevating device according to claim 1. The said receiving part has a frequency | count measurement part which measures the frequency | count of a drive of the said hydraulic drive part. The load receiving table raising / lowering apparatus of Claim 2 characterized by the above-mentioned. An operation unit capable of outputting an operation signal to the control unit is provided,
The control unit includes a receiving unit that receives the operation signal,
The said frequency | count measurement part is comprised by the receiving detection part connected to the said receiving part, and detecting the presence or absence of reception of the said operation signal. The load receiving table raising / lowering apparatus of Claim 3 characterized by the above-mentioned. The load receiving table elevating device according to claim 3, wherein the number measuring unit is configured by a motor drive detecting unit that measures the number of times the motor is driven. The cargo receiving platform elevating device according to any one of claims 2 to 5, wherein a timer is connected to the storage unit.

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