JP6525799B2 - Receiving platform lifting device - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a loading and unloading apparatus mounted on a lorry or the like.

For example, a so-called underfloor storage type receiving and lifting apparatus stored in the lower rear of a cargo box is known as a receiving and lifting apparatus mounted on a lorry and used for loading and unloading of cargo.
The underfloor retractable loading and unloading apparatus is stored below the rear of the cargo box by moving the loading rack forward and moving it forward. When using the receiving and lifting device from this storage state, after operating the operation button, the folded receiving pad is moved backward from the storage state to the extended position where it is projected to the rear of the packing box, and then the automatic operation is performed automatically. Lower the ground to lower the base of the pod. By expanding the receiving block from this state, the receiving block can be raised and lowered between the ground and the floor surface of the load box (see, for example, Patent Document 1).

JP, 2006-123621, A

  In a lorry equipped with the above-mentioned loading platform lifting device, for example, when loading and unloading a lightweight load, an operator does not use the loading platform lifting device and from the back of the loading box to the ground and the floor surface of the loading box. In some cases, loading and unloading work may be performed manually. In this case, the pod received under the rear of the loading box is used as a step for the operator to ascend and descend between the ground and the floor of the loading box.

However, since the above-mentioned receiving platform lifting device is stored so as not to project rearward of the loading box below the rear of the loading box, the operator inserts the toe into the gap between the loading box and the receiving platform There is a problem that it is necessary to ascend and descend in the state, and it is difficult for the packing box to ascend and descend.
Then, in order to make it easy for the worker to ascend and descend, it is conceivable to operate the above-mentioned operation button to move the receiving stand backward from the storage state and to project it to the rear of the packing box. However, in this case, when the receiving pad is moved backward to the overhanging position, the receiving pad is automatically lowered and there is a possibility that it can not be used as a step.

  The present invention has been made in view of the above-mentioned problems, and a receiving platform disposed below a loading box is used as a step of easily moving up and down between the ground and the floor of the loading box. An object of the present invention is to provide a receiving platform lifting device that can be put into a state.

  According to another aspect of the present invention, there is provided a loading and unloading apparatus according to the present invention, comprising: a loading pad on which a load is placed to load a load onto a load box mounted on a vehicle body; A lift drive for raising and lowering between a raised position corresponding to a surface and a grounded position for grounding on the ground; a rear position located at the rear of the cargo box for loading and unloading the load receiving platform A front-back drive unit for moving the load-bearing platform forward of the rear position to the ground position, and an operation command for outputting the operation command to the ground position; An operation means, a backward movement position detection means for detecting that the receiving stand is at the rear position, and an operation command for moving the receiving stand backward when an operation command is received from the first operation means. Control the drive Lowering control for controlling the drive of the elevating drive device so as to lower the load receiving table when the rear shift position detecting means detects that the load receiving table has moved backward to the rear position by performing one-way movement control. And a control device for performing the control, the control device including: a second operation means for outputting, in addition to the first operation means, an operation command for using the reception stand as a step, the control When the apparatus receives an operation command from the second operation means, the apparatus performs the backward movement control, and the backward movement position detection means detects that the cargo support has moved backward to the backward position by the backward movement control. Also, the invention is characterized in that the lowering control is not performed.

  According to this configuration, by operating the second operation means, it is possible to cause the receiving stand disposed below the loading box to protrude to the rear of the loading box. By using the receiving platform as a step, it is possible to smoothly move up and down between the ground and the floor of the packing box. Further, when the second operation means is operated, the receiving board does not automatically lower even when the receiving board moves backward to the rear position, so the receiving board can be easily used as a step. it can.

  When the loading platform is used as a step, the height position of the loading platform may be too high (or lower) than the height position when moving back and forth by the operator moving up and down to the loading platform. In this case, when moving the loading platform used as a step forward, there are cases where the loading platform can not return to the forward position by interfering with the loading box or the member on the vehicle body side.

For this reason, the loading and unloading table lifting apparatus further includes third operating means for outputting an operation command for moving the loading receiving table forward from a state where it is used as a step, and the control device is the third operating means. Performs height position adjustment control to control the drive of the elevation drive device so as to perform at least one of lowering and raising of the receiving table by a predetermined amount when receiving an operation command from the load receiving table, and then moving the receiving table forward It is preferable to control the drive of the front and rear drive device so as to make it possible.
In this case, when the third operation means for moving the loading rack used as a step forward is operated, control is performed to lower the loading rack by a predetermined amount (or raise it) and then move the loading rack forward. Interference with a loading box or a member on the vehicle body side can be suppressed.

In the loading and unloading apparatus, it is preferable that the control device controls the driving of the lifting and lowering drive device so as to lower the loading and unloading table by a predetermined amount as the height position adjustment control.
In this case, even if the height position of the loading platform becomes too high by using the loading platform as a step, the control device lowers the loading platform by a predetermined amount and then moves it forward, so the loading platform is a cargo box And interference with members on the vehicle body side can be suppressed.

When the height position of the loading platform becomes too low by using the loading platform as a step, the loading platform may be in a grounded state when the loading platform is lowered by a predetermined amount by the operation of the third operation means. There is a risk that the loading platform may be damaged if the loading platform is moved forward in this state.
For this reason, in the loading and unloading apparatus, the control device lowers the loading receiving table by a first predetermined amount as the height position adjustment control, and then reduces the loading receiving table by less than the first predetermined amount. It is preferable to control the drive of the elevating and lowering drive device so as to ascend by a predetermined amount.
In this case, the control device lowers the loading tray by a first predetermined amount, and then raises the loading tray by a second predetermined amount smaller than the first predetermined amount, and then moves the loading tray forward, so that the loading holder interferes with the ground Damage can be suppressed.

  According to the loading and unloading apparatus of the present invention, the loading and unloading table disposed below the loading box can be easily used as a step of moving up and down between the ground and the floor surface of the loading box. it can.

FIG. 1 is a side view of a loading and unloading apparatus according to a first embodiment of the present invention. FIG. 7 is a side view showing a usage state in which the loading cradle is slid backward from the sliding front end position (forward position) of FIG. 1 and is allowed to unfold and lift the loading cradle after reaching a predetermined slide rear end position (back position). It is a top view which shows the state which the slide cylinder contracted most. It is a side view of Drawing 3, and (a) is a schematic side view showing the state where a slide cylinder contracted the most, b) is a schematic side view showing the state where a slide cylinder extended most. It is a block diagram of a receiving platform lifting device. It is a flowchart which shows the process performed when a control apparatus receives the operation command of a step switch. It is a side view which shows the state which makes a receiving platform stop in arbitrary slide positions, and uses it as a step. It is a flowchart which shows the process performed when a control apparatus receives the operation command of a storage switch. It is a side view which shows the state which lowered only the 1st predetermined amount from the state which is using the receiving platform as a step. It is a side view which shows the state which raised the receiving platform from the state of FIG. 9 by 2nd predetermined amount. It is a block diagram of a loading-and-lowering machine elevator concerning a 2nd embodiment of the present invention. It is a side view which shows the use condition which expand | deploys and raises / lowers the loading box of 2nd Embodiment. It is a side view which shows the halfway position of the loading dock of 2nd Embodiment. It is a side view which shows the state which slid the load receiving stand to the front position from the state of FIG. It is a side view which shows the storage position of the receiving platform of 2nd Embodiment. It is a side view which shows the state which slid the loading dock of 2nd Embodiment from a storage position to a back position. It is a flowchart which shows the process performed when the control apparatus of 2nd Embodiment receives the operation command of a storage switch.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment
[overall structure]
FIG. 1 is a side view of a loading and unloading apparatus according to a first embodiment of the present invention. This state represents a state in which the loading and unloading device 1 is stored below the rear of the cargo box B in the vehicle V, that is, a state in which the vehicle V can travel. On the other hand, in FIG. 2, after the whole of the receiving and lifting apparatus 1 is slid from the slide front end position (front position) of FIG. 1 to the rear of the cargo box B to reach a predetermined slide rear end position (rear position) It is a side view which shows the use condition which carries out the loading-and-unloading operation | work of a luggage | load by unfolding and raising / lowering the loading dock 19.

  A loading box B is mounted on the vehicle body 2 of the vehicle V. The vehicle body 2 of the present embodiment has a chassis frame 2a and a sub-frame 2b disposed so as to overlap on the chassis frame 2a. The sub frame 2 b is disposed on the lower surface of the cargo box B and has a function of reinforcing the cargo box B. Below the rear end of the chassis frame 2a, a so-called underfloor storage type receiving and lifting apparatus 1 is stored.

In FIG. 2, the fixed side support members 3 provided on the left and right in the vehicle width direction of the loading and unloading apparatus 1 respectively mount the slide rails 4 horizontally extending in the vehicle longitudinal direction and the vehicle body 2. A plurality of (three in this example) mounting brackets 5 and a connecting member 6 consisting of a square pipe connecting the front end portions of the pair of left and right slide rails 4 are provided.
The slide rail 4 and each mounting bracket 5 are fastened by two bolts 7 and a nut (not shown) (see FIG. 1). A support plate 8 is slidably mounted on the slide rail 4 in the longitudinal direction of the vehicle.

  A pair of left and right support plates 8 penetrates a cross member 9 consisting of a square pipe extending horizontally in the vehicle width direction (note that although both side end portions have three square pipes stacked for reinforcement, in the vehicle width direction Only one is erected), they are welded together integrally. Support brackets 10 and 11 are welded integrally with the cross member 9 on the outer side in the vehicle width direction than the support plate 8. A pair of left and right support brackets 10 and 11 is also provided.

  Lower portions of the pair of left and right support plates 8 are connected by a connecting member 12 made of a channel material (see FIG. 3). The support plate 8, the cross member 9, the support brackets 10 and 11, and the connection member 12 constitute a movable support member 13 which can slide in the longitudinal direction of the vehicle with respect to the fixed support member 3.

  An auxiliary link 14 is rotatably attached to the support bracket 10 within a predetermined range, and an upper arm 15 and a lift cylinder (lifting and lowering drive device) 16 are rotatably attached to the auxiliary link 14. The tip of the lift cylinder 16 is connected to a predetermined position of the upper arm 15 and applies a torque to the upper arm 15 by telescopic operation. A lower arm 17 is rotatably attached to the support bracket 11. The lift cylinder 16 is, for example, a single-acting hydraulic cylinder.

  The upper arm 15 and the lower arm 17 constitute a parallel link in which a quadrangle connecting the fulcrum and the point of action thereof is a parallelogram, and the distal end side thereof is moved up and down by the extension operation of the lift cylinder 16. The auxiliary link 14, the upper arm 15, the lift cylinder 16, and the lower arm 17 are provided as a pair on the left and right, and constitute an arm-type lifting device 18 that raises and lowers the load receiving table 19.

The cargo support 19 includes a main plate (base support) 191 horizontally attached to the tip of the upper arm 15 and the lower arm 17 and a sub-plate (foremost support) connected foldably and deployable thereto. A connecting portion 193 connecting the main plate 191 and the sub plate 192 is provided.
The connecting portion 193 has a hinge 193a having one end rotatably connected to the tip of the main plate 191 and the other end rotatably connected to the proximal end of the sub plate 192 (see also FIG. 1). ).

  With the above configuration, the sub plate 192 is folded on the main plate 191 during storage. Further, in use, the sub-plate 192 is developed, so that the receiving surface 19 a which is continuous from the upper surface of the main plate 191 to the upper surface of the sub-plate 192 is configured on the receiving table 19. On the receiving surface 19a, a load to be unloaded and unloaded from the shipping box B is placed.

  As described above, when the lift cylinder 16 is driven to extend and retract in the state where the receiving surface 19a is configured, the receiving position 19 is moved up to the elevation position where the floor surface b1 of the shipping box B and the receiving surface 19a become substantially the same height position It can be raised and lowered between the upper position in FIG. 2) and the grounded position (lower position in FIG. 2) grounded to the ground. As a result, by raising and lowering the cargo support 19 at the rear (right side in FIG. 2) of the loading box B, the load can be unloaded from the loading box B of the vehicle V.

  A roller mounting plate 20 is attached to each of the pair of left and right support plates 8 so as to project rearward, and a guide roller 21 is rotatably attached to the rear end thereof. The leading end of the sub plate 192 can be placed on the guide roller 21.

  Next, a slide cylinder (longitudinal drive device) 22 for sliding the loading and unloading device 1 between the front position and the rear position will be described. FIG. 3 is a plan view showing the slide cylinder 22 in its fully contracted state. FIG. 4A is a schematic side view showing the slide cylinder 22 in a fully contracted state, and FIG. 4B is a schematic side view showing the slide cylinder 22 in a most extended state.

  In FIG. 3, the slide cylinder 22 is configured by a pair of left and right cylinders 23 disposed between the left and right slide rails 4 in the vehicle width direction. The cylinder 23 is, for example, a double acting hydraulic cylinder. The cylinder bodies 24 of the left and right cylinders 23 are superimposed on each other in the state in which the front and rear end portions thereof are disposed reverse to each other, and are integrally connected by a pair of front and rear joint portions 25.

  In FIGS. 3 and 4, the cylinder 23 on the right side (the upper side in FIG. 3) has a boss 26a integrally formed on the tip of a piston rod 26 attached to a mounting plate 27 by a pin 28. The mounting plate 27 is fixed to a substantially middle portion of the connecting member 6 in the vehicle width direction. The cylinder 23 on the left side (the lower side in FIG. 3) is attached by a pin 31 to a mounting plate 30 in which a boss 26a of a piston rod 26 is fixed to a mount 29 extending in the vehicle longitudinal direction.

  The mounting base 29 is formed with an upper mounting base 29a on the upper surface of which the mounting plate 30 is fixed, a shorter length in the vehicle longitudinal direction than the upper mounting base 29a, and a bolt 32 at the lower part of the upper mounting base 29a. The lower mount 29b is fixed by a nut (not shown). A lower end of the lower mount 29 b is fixed to a substantially middle portion in the vehicle width direction of the connecting member 12. Further, the front end portion of the lower mount 29 b is fixed to a substantially middle portion in the vehicle width direction of the cross member 9.

  According to the above configuration, when using the pod 19 stored in the state shown in FIG. 1, the slide cylinder 22 is slid rearward by the extension operation to be retracted to the rearward position. Next, when the lift cylinder 16 is contracted, the upper arm 15 and the lower arm 17 rotate downward as shown by the solid line in FIG. 2, and the main plate 191 lands. At this time, since the main plate 191 is horizontal, and the tip of the sub plate 192 is on the guide roller 21, the sub plate 192 pivots in the clockwise direction in FIG.

  Next, the sub plate 192 is raised by hand and laid horizontally behind the main plate 191. Thus, the receiving board 19 is horizontally expanded. In this state, when the lift cylinder 16 is operated to extend, it is possible to lift the pod 19 to the raised position of FIG. 2 while keeping the pod 19 horizontal. In addition, if the lift cylinder 16 is contracted from the raised position, the load receiving table 19 can be lowered to the original position.

  If the lift cylinder 16 is further contracted after the lower arm 17 lands, the load receiver 19 tilts to lower its front end (rear end) by the action of the auxiliary link 14 and follows the ground. Thus, for example, the cart can be easily loaded and unloaded onto the receiving surface 19 a by moving a cart (load) having a caster (not shown) forward from the rear of the receiving table 19.

  In order to store the cargo support 19, the lower plate 17 lands, and the sub-plate 192 is erected from the state where the cargo support 19 is horizontal, and is further raised against the guide roller 21. Next, the upper arm 15 and the lower arm 17 are raised, and the sub plate 192 is folded on the main plate 191 by its own weight. Then, the slide cylinder 22 is contracted to draw the movable support member 13, the lifting device 18 and the cargo support 19 to the front position, and the storage state of FIG. 1 is obtained.

  In FIG. 3, a power unit 40 having a control device 41 (see FIG. 5) for controlling the drive of the lift cylinder 16 and the slide cylinder 22 is attached to one end (upper side in FIG. 3) of the cross member 9 in the longitudinal direction. ing. Further, at the other end (lower side in FIG. 3) of the cross member 9 in the longitudinal direction, an operation switch 43 for outputting an operation command for moving the load receiving table 19 up and down or sliding to the control device 41 is accommodated. The switch box 42 is attached.

  In FIG. 1, a step switch 46 and a storage switch 47 which will be described later are attached to the rear end portion of the sub frame 2 b of the vehicle body 2. In addition, these switches 46 and 47 may be attached to other places, such as switch box 42 grade | etc.,.

[Control device]
FIG. 5 is a block diagram of the receiving and lifting device 1. In FIG. 5, the operation switch 43 is connected to the control device 41 of the receiving and lifting apparatus 1. The operation switch 43 is composed of a raising switch 44 and a lowering switch 45. Each of the switches 44 and 45 is a non-holding switch of a type in which the operation command is output only while operating and the operation command is not output when the hand is released. The control device 41 incorporates a timer 41a.

  The control device 41 is connected to first to fourth sensors 51 to 54. These sensors 51 to 54 are, for example, proximity sensors, and detection signals thereof are output to the control device 41. The first sensor 51 (rear movement position detection means) detects that the load receiving table 19 is in the rear position which is the slide rear end position. The second sensor 52 detects that the sub plate 192 is folded on the main plate 191.

  The third sensor 53 detects that the main plate 191 is at a height position where it can slide. In the present embodiment, the slidable height position coincides with the height position of the main plate 191 when the second sensor 52 detects a state in which the sub plate 192 is folded. The fourth sensor 54 detects that the loading tray 19 is in the front position, which is the slide front end position.

  When the load receiver 19 is in the forward position (see FIG. 1), the control device 41 drives the slide cylinder 22 to extend when receiving the operation command of the lowering switch 45, and causes the load receiver 19 to slide backward. I do. Then, when the first sensor 51 detects that the load receiving table has slid to the rear position, the control device 41 stops the extension drive of the slide cylinder 22 and causes the lift cylinder 16 to contract to move the upper arm 15 and the lower arm. A downward control of lowering the main plate 191 of the loading table 19 to the ground contact position (see FIG. 1) is performed by the downward rotation of 17. Therefore, the lowering switch 45 functions as a first operation means for outputting an operation command to move the load receiving stand 19 located in front of the rear position to the ground position.

When the load receiving table 19 is expanded (see FIG. 1), the control device 41 drives the lift cylinder 16 to extend when the operation command of the lift switch 44 is received, and the upper arm 15 and the lower arm 17 rotate upward. The loading table 19 is raised to the raised position.
Further, when the load receiving table 19 is in the raised position (see FIG. 1), the control device 41 causes the lift cylinder 16 to contract when it receives an operation command of the lowering switch 45 to lower the upper arm 15 and the lower arm 17. The load receiving table 19 is lowered to the ground position by the rotation.

  The control device 41 receives the operation command of the lift switch 44 in a state where the sub plate 192 of the pod 19 in the ground position is erected and held against the guide roller 21 first, the lift cylinder 16 Is driven to extend, and the upper and lower arms 15 and 17 are pivoted upward to raise the load receiving table 19. Then, when the second sensor 52 detects that the sub plate 192 is folded on the main plate 191 by its own weight, the control device 41 stops the extension drive of the lift cylinder 16 and the slide cylinder 22. Is driven to slide the folded pod 19 forward.

  In FIG. 5, a step switch 46 and a storage switch 47 are further connected to the control device 41. Each of the switches 46 and 47 is a non-holding switch of a type in which the operation command is output only while the switch is operated, and the operation command is not output when the hand is released, similar to the lift switch 44 and the like.

  The step switch 46 functions as a second operation means for outputting an operation command for using the folded sheet receiving platform 19 as a step. In addition, the storage switch 47 functions as a third operation means for outputting an operation command for moving the receiving board 19 forward as a step.

  When receiving the operation command of the step switch 46 in a state where the receiving table 19 is in the front position (see FIG. 1), the control device 41 performs backward movement control to slide the receiving table 19 backward as described above. However, even if the first sensor 51 detects that the receiving board 19 has moved backward to the backward position by this backward movement control, the control device 41 does not perform the lowering control to lower the main plate 191.

  The control device 41 receives at least one of the lowering and raising of the receiving table 19 by a predetermined amount when receiving the operation command of the storage switch 47 in a state where the receiving table 19 is used as a step (see FIG. 1). The height position adjustment control is performed to control the drive of the lift cylinder 16 as performed. Thereafter, the control device 41 causes the slide cylinder 22 to be driven to contract and performs forward movement control to slide the loading receptacle 19 forward.

  As the height position adjustment control, the control device 41 of the present embodiment lowers the load receiving table 19 by a first predetermined amount, and then raises the load receiving table 19 by a second predetermined amount smaller than the first predetermined amount. Control the drive of the lift cylinder 16 in the same manner. The height position adjustment control may be only control for lowering the receiving board 19 by a predetermined amount, or may be control only for raising the receiving board 19 by a predetermined amount. Further, the height position adjustment control is performed, for example, when raising the load receiving base 19 by a second predetermined amount from the state where the load receiving base 19 is located below the height position at which the load receiving base 19 can slide. After lowering the receiving board 19 downward from the third sensor 53 by lowering the first predetermined amount smaller than the fixed amount, the receiving stand 19 may be raised by the second predetermined amount.

[Control when using a pod as a step]
FIG. 6 is a flow chart showing processing executed when the control device 41 receives an operation command of the step switch 46. First, when the step switch 46 is turned on and the operation command is received (in the case of “Yes” in step ST1), the control device 41 starts counting of the timer 41a (step ST2). Then, the control device 41 causes the lift cylinder 16 to contract and move simultaneously with the start of counting by the timer 41a (step ST3).

Thereafter, when a predetermined time ta (for example, a few tenths of a second) has elapsed (in the case of "Yes" in step ST4), the control device 41 stops counting of the timer 41a and stops the contraction drive of the lift cylinder 16 (Step ST5).
Depressurization of the lift cylinder 16 is performed by control of said step ST2-step ST5, and the load receiving stand 19 descends | falls a little from the stored state shown in FIG. As a result, the load receiving table 19 is released from the upward pressing force on the slide rail 4 and becomes slidable.

  Next, the control device 41 drives the slide cylinder 22 to extend (step ST6), and slides the receiving block 19 from the front position to the rear. Then, when the step switch 46 is turned OFF (in the case of “Yes” in step ST7), the control device 41 stops the extension drive of the slide cylinder 22 (step ST8), and returns to step ST1. As a result, as shown in FIG. 7, since the receiving table 19 can be stopped at any slide position, when using the receiving table 19 as a step, the protrusion amount of the receiving table 19 to the rear of the cargo box B It can be adjusted.

On the other hand, if the step switch 46 is not turned OFF when the receiving board 19 is sliding backward in step ST6 (in the case of "No" in step ST7), the fact that the receiving board 19 has slid to the rear position is It is monitored whether or not the first sensor 51 has detected (step ST9).
Then, when the first sensor 51 does not detect (in the case of “No” in step ST9), the control device 41 returns to step ST6 and continues the extension drive of the slide cylinder 22.

  On the other hand, when the first sensor 51 detects in step ST9 (in the case of "Yes" in step ST9), the control device 41 stops the extension drive of the slide cylinder 22 and ends the processing (step ST10). . Therefore, by the ON operation of the step switch 46 being continued, the lowering control for lowering the receiving stand 19 is not performed even if the receiving stand 19 slides to the rear position.

[Control in the case of moving forward from the state where the loading platform is used as a step]
FIG. 8 is a flowchart showing processing executed when the control device 41 receives an operation command of the storage switch 47. First, when the storage switch 47 is turned on and the operation command is received (in the case of “Yes” in step ST11), the control device 41 starts counting of the timer 41a (step ST12). Then, the control device 41 causes the lift cylinder 16 to contract and move simultaneously with the start of counting by the timer 41a (step ST13). Thereby, the receiving stand 19 descend | falls from the state currently used as a step of FIG.

  Thereafter, when a predetermined time t0 (for example, several seconds) elapses in the timer 41a (in the case of “Yes” in step ST14), the control device 41 stops the count of the timer 41a and stops the contraction drive of the lift cylinder 16 (step ST15). The predetermined time t0 is set to a time required for the receiving board 19 to be positioned lower than the height position at which it can slide by being lowered by a first predetermined amount from the state where it is used as a step. ing.

  Thereby, as shown in FIG. 9, the receiving board 19 stops in the state which descend | falled only the 1st predetermined amount from the state currently used as a step. In the present embodiment, the descent position of the receiving table 19 is controlled by the timer 41a, but it may be detected by a sensor or the like that the receiving table has been lowered by the first predetermined amount.

Next, the control device 41 drives the lift cylinder 16 to extend (step ST16), and raises the load receiving table 19 from the lowered state. Then, when the third sensor 53 detects that the main plate 191 of the cargo support 19 has risen to a slidable height position (in the case of “Yes” in step ST17), the control device 41 drives the lift cylinder 16 for extension. Are stopped (step ST18).
By performing the height position adjustment control in the above steps ST12 to ST18, the receiving board 19 becomes a slidable height position as shown in FIG. 10 from the state where it is used as a step.

  Next, the control device 41 causes the slide cylinder 22 to contract and drive (step ST19), and slides the receiving board 19 forward. Then, when the fourth sensor 54 detects that the receiving board 19 has slid to the front position, which is the slide front end position (in the case of “Yes” in step ST20), the control device 41 stops the contraction drive of the slide cylinder 22. (Step ST21), the process ends.

[Function effect]
According to the receiving and raising apparatus 1 of the present embodiment configured as described above, the receiving stand 19 disposed below the cargo box B is protruded to the rear of the packing box B by operating the step switch 46. Since it can be made to be in the state where it is made to be, a worker can rise and fall smoothly between the ground and the floor surface b1 of the cargo box B by using the receiving stand 19 of this state as a step. Further, when the step switch 46 is operated, the receiving board 19 does not automatically descend even when the receiving board 19 moves backward to the rear position, so that the receiving board 19 is used as a step easily. be able to.

  In addition, when the worker moves up and down to the load receiving table 19 while using the load receiving table 19 as a step, the load receiving table 19 vibrates up and down due to the reaction and the inside of the lift cylinder 16 becomes negative pressure, which is not illustrated. The lift cylinder 16 may be extended by suction of hydraulic oil in the tank into the lift cylinder 16. In this case, when the loading stand 19 used as a step is moved forward by the height position of the loading stand 19 being higher than the height position when moving back and forth, the receiving stand 19 is the cargo box B. And interfere with the member on the side of the vehicle body 2 and can not return to the front position.

  However, in the present embodiment, the control device 41 moves back and forth from the state in which the receiving board 19 is used as a step, even if the height position of the receiving board 19 becomes too high as described above. Since it is slid forward after being lowered to below the height position at the time, interference of the cargo support 19 with the cargo box B and the member on the vehicle body 2 side can be suppressed.

  In addition, when the height position of the receiving board 19 becomes too low by using the receiving board 19 as a step, the receiving board 19 is grounded when the receiving board 19 is lowered by a predetermined amount by the operation of the storage switch 47 If the loading stand 19 is moved forward in this state, the loading stand 19 may be damaged. However, the control device 41 according to the present embodiment moves the receiving board 19 forward after raising the receiving board 19 by a first predetermined amount and then raising the receiving board 19 by a second predetermined amount smaller than the first predetermined amount. It is possible to prevent the receiving stand 19 from interfering with the ground and damaging it.

Second Embodiment
FIG. 11 is a block diagram of a loading and unloading apparatus according to a second embodiment of the present invention. Moreover, FIGS. 12-16 is a side view which shows each operation state of the loading-and-lowering board raising / lowering apparatus.
The receiving and lifting apparatus 1 of the present embodiment is different from the first embodiment in that the operation for storing the receiving table 19 below the loading box B is different.

  In FIG. 11, fifth and sixth sensors 55 and 56 are connected to the control device 41 of the present embodiment instead of the second and third sensors 52 and 53 (see FIG. 5). The fifth and sixth sensors 55 and 56 are, for example, proximity sensors, and their detection signals are output to the control device 41. As shown in FIG. 13, the fifth sensor 55 detects that the main plate 191 of the pod 19 is at an intermediate position between the elevated position and the ground position. The sixth sensor 56 detects that the receiving stand 19 is at the storage position which is the height position to be stored.

  The control device 41 receives the operation command of the lift switch 44 in a state where the sub plate 192 of the pod 19 in the ground position is erected and held against the guide roller 21 first, the lift cylinder 16 Is extended and the main plate 191 is raised by turning the upper arm 15 and the lower arm 17 upward. Then, when the fifth sensor 55 detects that the main plate 191 has risen to an intermediate position (see FIG. 13), the control device 41 stops the extension drive of the lift cylinder 16 and causes the slide cylinder 22 to contract and drive. The receiving board 19 is slid forward from the midway position.

Then, as shown in FIG. 14, when the first sensor 51 detects that the load receiving table 19 has slid to the front position, the control device 41 stops the contraction drive of the slide cylinder 22 and extends the lift cylinder 16 again. The loading table 19 is raised by driving.
Then, as shown in FIG. 15, when the sixth sensor 56 detects that the cargo support 19 has risen to the stored position where it is folded, the control device 41 stops the extension drive of the lift cylinder 16.

  The control device 41 causes the slide cylinder 22 to extend and drive the slide table 19 backward when it receives an operation command of the step switch 46 in a state where the load table 19 is in the storage position (see FIG. 15) I do. However, even if the first sensor 51 detects that the receiving board 19 has moved backward to the backward position shown in FIG. 16 by this backward movement control, the control device 41 does not perform the lowering control to lower the main plate 191.

  In a state in which the receiving table 19 is used as a step, when receiving the operation command of the storage switch 47, the control device 41 first performs a lift cylinder so that at least one of lowering and raising of the receiving table 19 is performed by a predetermined amount. Perform height position adjustment control to control 16 drives. Thereafter, the control device 41 causes the slide cylinder 22 to contract and drive to move the load receiving table 19 to the front position (see FIG. 14) and then to move it forward to the storage position (see FIG. 15).

[Control in the case of moving forward from the state where the loading platform is used as a step]
FIG. 17 is a flow chart showing processing executed when the control device 41 receives an operation command of the storage switch 47. First, when the storage switch 47 is turned on and the operation command is received (in the case of “Yes” in step ST31), the control device 41 starts counting of the timer 41a (step ST32). Then, the control device 41 causes the lift cylinder 16 to contract and move simultaneously with the start of counting of the timer 41a (step ST33). Thereby, the receiving stand 19 descend | falls from the state currently used as a step.

  Thereafter, when the timer 41a has passed a predetermined time t0 (for example, several seconds) (in the case of "Yes" in step ST34), the control device 41 stops the count of the timer 41a and stops the contraction drive of the lift cylinder 16 (step ST 35). The predetermined time t0 is set to a time necessary for the receiving board 19 to be positioned lower than the midway position by lowering by a first predetermined amount from the state where it is used as a step.

  Thereby, the receiving board 19 stops in the state which descent | falled only the 1st predetermined amount from the state currently used as a step. In the present embodiment, the descent position of the receiving table 19 is controlled by the timer 41a, but it may be detected by a sensor or the like that the receiving table has been lowered by the first predetermined amount.

Next, the control device 41 drives the lift cylinder 16 to extend (step ST36), and raises the load receiving table 19 from the lowered state. Then, when the fifth sensor 55 detects that the main plate 191 of the receiving board 19 has risen to an intermediate position (in the case of “Yes” in step ST37), the control device 41 stops the extension drive of the lift cylinder 16 ( Step ST38).
By performing the height position adjustment control in the above steps ST32 to ST38, the receiving board 19 changes from the state used as a step to the height position of the halfway position.

  Next, the control device 41 causes the slide cylinder 22 to contract and drive (step ST39), and slides the receiving board 19 forward. Then, when the fourth sensor 54 detects that the receiving board 19 has slid to the front position, which is the slide front end position (in the case of “Yes” in step ST40), the control device 41 stops the contraction drive of the slide cylinder 22. (Step ST41). As a result, the cargo support 19 slides and stops at the front position, which is the sliding front end position, while holding the height position at the midway position.

Next, the control device 41 drives the lift cylinder 16 to extend (step ST42), and raises the load receiving table 19 from the front position. Then, when the sixth sensor 56 detects that the receiving board 19 has risen to the storage position (in the case of “Yes” in step ST43), the control device 41 stops the extension drive of the lift cylinder 16 (step ST44), End the process.
In addition, the point which abbreviate | omitted description in 2nd Embodiment is the same as that of 1st Embodiment.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the meaning described above but by the claims, and is intended to include the meanings equivalent to the claims and all modifications within the scope.

1 Lifting unit 16 Lifting cylinder (lifting drive)
19 Loading stand 22 slide cylinder (front and rear drive)
41 Control device 45 Lowering switch (first operating means)
46 Step switch (second operating means)
47 Storage switch (third operating means)
51 1st sensor (rear movement position detection means)
B Packing box b1 Floor V Body

Claims (4)

A loading platform for loading the load in order to load the load on the loading box mounted on the vehicle body;
An elevation driving device for raising and lowering the cargo support between an elevated position corresponding to the floor surface of the cargo box and a grounded position grounded on the ground;
A longitudinal drive device for moving the loading and unloading table back and forth between a rear position disposed behind the cargo box and a front position disposed below the cargo box for loading and unloading operations;
A first operation means for outputting an operation command to move the loading stand located forward of the rear position to the ground position;
Back movement position detection means for detecting that the loading platform is at the back position;
When the operation command is received from the first operation means, the rear movement control is performed to control the drive of the front and rear driving device so as to move the receiving table backward, whereby the receiving table moves backward to the rear position. And a control device for performing a lowering control to control the driving of the lifting and lowering drive device so as to lower the loading and unloading table when the backward movement position detecting means detects the rear moving position detecting means.
In addition to the first operation means, the second operation means for outputting an operation command for using the receiving board as a step is provided.
When the control device receives an operation command from the second operation means, the control device performs the backward movement control, and the backward movement position detection means detects that the cargo support has moved backward to the backward position by the backward movement control. However, the lowering control is not performed, and the receiving platform lifting device. The system further comprises third operation means for outputting an operation command for moving the receiving platform forward as it is being used as a step.
When the control device receives an operation command from the third operation means, height position adjustment control is performed to control driving of the elevation drive device to perform at least one of lowering and raising of the receiving table by a predetermined amount. The loading and unloading system according to claim 1, wherein driving of the front and rear driving device is controlled so as to move the loading and unloading stand forward after having been carried out.   The loading and unloading apparatus according to claim 2, wherein the control device controls driving of the lifting and lowering drive device so as to lower the loading and unloading table by a predetermined amount as the height position adjustment control.   As the height position adjustment control, the control device raises and lowers the load receiving table by a second predetermined amount smaller than the first predetermined amount after lowering the load receiving table by a first predetermined amount. The loading and unloading apparatus according to claim 3, which controls the driving of the driving apparatus.

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