JP3976487B2 - Pallet transport vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transport vehicle that transports a pallet.
[0002]
[Prior art]
Conventionally, as this kind of pallet carrying vehicle, for example, there is one shown in Japanese Patent Laid-Open No. 2000-85445. That is, a lift frame (support member) that can be raised and lowered to support a pallet to be conveyed on the rear vehicle body, a lift cylinder that raises and lowers the lift frame from the vehicle body between an upper limit position and a lower limit position, and the lift frame at the upper limit position. And a hoisting cylinder for raising and lowering the projecting support body. Further, a link for moving the lift frame in the vertical direction is provided between the rear vehicle body and the lift frame.
[0003]
The operation of pallet loading / unloading work in the pallet carrying vehicle will be described.
Loading work
The pallet carrying vehicle is moved backward, the rear vehicle body is inserted under the eaves of the pallet, the piston rod of the lift cylinder protrudes, the lift frame is raised from the lower limit position, and the lift frame is moved from below to the supported surface of the pallet. The pallet is supported by the lift frame and lifted to the upper limit position.
[0004]
Subsequently, during the pallet transport to the lift cylinder, the load of the lift frame and the pallet is applied, and in order to prevent damage to the cylinder, the piston rod of the hoisting cylinder is protruded to raise the support body, and the lift frame is lifted by the support body. Is held at the upper limit position, and then the piston rod of the lift cylinder is retracted to prevent the lift cylinder and pallet from being loaded on the lift cylinder during pallet transport. The lift frame and the pallet are supported by a support body.
[0005]
Thereafter, the vehicle is driven to transport the pallet to the destination.
Unloading work
When the vehicle travels and reaches the destination of the pallet, the piston rod of the lift cylinder is first protruded, and the lift frame and the pallet are supported again by the lift cylinder.
[0006]
Subsequently, the piston rod of the hoisting cylinder is retracted, and the thrust support body is laid sideways. At this time, the lift frame and the pallet are held by the lift cylinder at the upper limit position.
[0007]
Next, the piston rod of the lift cylinder is retracted, the lift frame is lowered while maintaining the support of the lift frame and the pallet by the lift cylinder, and the pallet is unloaded from the lift frame to the ground. The lift frame is further lowered to the lower limit position.
[0008]
Thereafter, the vehicle is driven and the rear vehicle body is allowed to escape from under the eaves of the pallet.
In this way, the pallet loading / unloading operation is executed. At this time, driving of the lift frame by the lift cylinder and driving of the support member by the hoisting cylinder are performed by an operator operating levers as respective manual operation means.
[0009]
[Problems to be solved by the invention]
However, in the above conventional type, the worker must perform a series of operations in the loading / unloading operations by operating the levers of the lift cylinder and the undulation cylinder, which makes the operation complicated and complicated. There was a problem that the burden was large.
[0010]
Therefore, an object of the present invention is to provide a pallet carrying vehicle that can simplify the operation of the worker during loading / unloading work and reduce the burden on the worker.
[0011]
[Means for Solving the Problems]
  In order to achieve the aforementioned objectives,The present inventionAt the rear of the vehicle body, a support member that lifts and supports the pallet, an elevating device that raises and lowers the support member between the upper limit position and the lower limit position, and a stand device that holds the front support member at the upper limit position are provided.
  A vehicle for pallet transport that moves the vehicle body backward, inserts the support member into an insertion portion formed on the pallet, and supports and supports a supported surface formed on the pallet with the support member;
  A selection operation means for selecting a loading operation for supporting the pallet by the support member and an unloading operation for unloading the pallet from the support member is provided in the cab of the vehicle, and the loading operation is selected by the selection operation means. The support member is raised to the upper limit position by the lifting device, the support member is then held at the upper limit position by the stand device, and then the lifting device is lowered, and the loading operation is selected by the selection operation means. And a control means for raising the lifting device to an upper limit position to support the support member, then lowering the stand device, and subsequently lowering the support member to the lower limit position by the lifting device,In the cab of the vehicle, there is provided an automatic / manual selection means for selecting a manual mode in which the lifting device and the stand device are driven by manual operation means, and an automatic mode in which the lifting device and the stand device are driven by the control means, When the manual mode is selected by the automatic / manual selection means, the lifting device and the stand device are manually driven to perform loading and unloading operations, and when the automatic mode is selected by the automatic / manual selection means In response to the selection operation of the loading / unloading operation by the selection operation means, the control device automatically drives the lifting device and the stand device.It is characterized by this.
[0012]
According to the above configuration, the control means automatically performs the loading / unloading work according to the selection operation of the loading / unloading work by the selection operation means. That is, during the loading operation, the support member is raised to the upper limit position by the lifting device, and then the support member is held at the upper limit position by the stand device, then the lifting device is lowered, and during the unloading operation, the lifting device is moved to the upper limit position. The support member is supported by raising the stand device, and then the stand device is lowered, and then the support member is lowered to the lower limit position by the lifting device.
[0013]
  Further, the present invention provides an automatic / manual mode for selecting a manual mode in which the lifting device and the stand device are driven by manual operation means and an automatic mode in which the lifting device and the stand device are driven by the control means in the cab of the vehicle. Provided a selection meansIt is characterized by this.
[0014]
According to the above configuration, when the automatic mode is selected by the automatic / manual selection means, the lifting / lowering device and the stand device are automatically driven by the control means according to the selection operation of the loading / unloading work by the selection operation means. Done.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a pallet carrying vehicle according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a pallet carrying vehicle that carries a pallet 2, and the pallet 2 includes a pallet main body 3 on which a material to be conveyed 52 is placed and It is composed of a plurality of front and rear legs 4 hanging from both sides and a pair of left and right ground frames 5 connected between the front and rear of the lower ends of these legs 4. Thus, the pallet 2 is formed in a gate shape when viewed from the front, and an insertion portion 6 is formed below the pallet body 3 and between the left and right legs 4. The lower surface of the pallet body 3 is formed as a supported surface 7.
[0018]
The pallet carrying vehicle 1 is configured as follows.
That is, as shown in FIG. 1 and FIG. 2, the vehicle body 10 of the pallet transport vehicle 1 includes a front vehicle body 12 provided with a pair of left and right front wheels 11 and a pair of left and right intermediate wheels 13 at two locations (front and rear). The intermediate body 14 is provided at one or a plurality of locations, and the rear vehicle body 16 is provided with a pair of left and right rear wheels 15 at three locations (a plurality of locations).
[0019]
A middle vehicle body 14 is connected to the front vehicle body 12 through a vertical coupling device 18 using a vertical pin 17 so as to be relatively pivotable around a longitudinal axis 19, and a portion of the vertical coupling device 18. Is provided with a steering cylinder device 20 (an example of a turning means). A cab 21 is provided at the top of the front vehicle body 12. The front wheel 11 is a drive wheel that is rotationally driven by an engine.
[0020]
A rear vehicle body 16 is connected to the intermediate vehicle body 14 via a lateral coupling device 23 so as to be relatively swingable around an axis 24 in the vehicle width direction (left-right direction). That is, the bracket 25 connected to the rear from the rear end of the intermediate body 14 and the bracket 26 connected to the front from the front end of the rear vehicle 16 are connected by the lateral pins 27, so that the intermediate body 14 and the rear vehicle body 16 are coupled around a vehicle width direction axis 24 so as to be relatively swingable.
[0021]
The rear vehicle body 16 includes a lift frame 30 (an example of a support member) that lifts and supports the pallet 2 and a plurality of lift frames 30 that move up and down between an upper limit position A and a lower limit position B (see FIG. 5). In the figure, three lift cylinders 31 (an example of a lifting device; see FIG. 9) are provided. Further, the rear vehicle body 16 and the lift frame 30 are connected via a four-link mechanism 32 that can swing up and down. Further, a plurality of (three in the figure) mechanical stands (protruding support bodies) 33 for holding the lift frame 30 at the upper limit position A, and the stands 33 are erected on the rear vehicle body 16 and laid sideways. A stand cylinder (undulation cylinder) 34 (see FIG. 9) is provided. A stand device is formed by the stand 33 and the stand cylinder 34.
[0022]
The front end portion of the lift frame 30 has a front stopper device 35 that can be brought into contact with and separated from the front end portion of the pallet main body 3 from the front, and the front stopper device 35 when the front stopper device 35 contacts the front end portion of the pallet main body 3. A pair of shock absorbers 36 that alleviate the impact are provided on each of the left and right sides.
[0023]
As shown in FIGS. 3 and 4, the front stopper device 35 includes a swing arm 37 and a stopper main body 38 provided at the upper end of the swing arm 37. The swing arm 37 is connected to the front end portion of the lift frame 30 via a horizontal shaft 39 inserted through the upper and lower intermediate portions, and is configured to be swingable about a left-right axis 40. The stopper body 38 is attached to the upper end of the swing arm 37 via an upper connecting pin 41 in the left-right direction (vehicle width direction), and is configured to be rotatable about the upper connecting pin 41.
[0024]
A front sliding surface 42 made of a material such as nylon is formed at the rear end of the stopper main body 38. Further, between the stopper main body 38 and the swing arm 37, there is provided a posture holding spring 43 that always holds the front sliding surface 42 in a vertical posture regardless of the swing of the swing arm 37.
[0025]
The horizontal shaft 39 is inserted between a pair of left and right brackets 44 provided at the front end of the lift frame 30. Further, a restricting member 45 that restricts swinging of the swing arm 37 in one direction C (that is, a direction in which the stopper main body 38 is displaced rearward) is provided at the front end portion of the lift frame 30. For example, a bolt is used as the regulating member 45.
[0026]
The shock absorber 36 includes a shock absorber 48 provided below the front end of the lift frame 30 via a bracket 47 and a pressing body 49 provided at the lower end of the swing arm 37. The buffer member 48 is made of an elastic member such as rubber. The pressing body 49 is positioned in front of the buffer member 48 and is attached to the swing arm 37 via a lower connecting pin 50 in the left-right direction (vehicle width direction), and rotates around the lower connecting pin 50. It is configured freely.
[0027]
The height h (see FIG. 5) from the lift frame 30 at the lower limit position B to the supported surface 7 of the pallet 2 is the height H of the pallet 2 supported by the lift frame 30 at the upper limit position A (ie, The distance is set to be smaller than the lifting distance from the ground shown in FIG.
[0028]
As shown in FIGS. 7 and 8, a pair of left and right front side stoppers 55 are provided at the front portion of the lift frame 30 so as to prevent lateral deflection. Similarly, at the rear portion of the lift frame 30, A pair of left and right rear side stoppers 56 are vertically suspended. 7 and 8, the front side stopper 55 is shown on the left side from the center line X, and the rear side stopper 56 is shown on the right side.
[0029]
As shown in FIGS. 7 and 8, a pair of left and right front brackets 59 are provided on both sides of the front portion of the rear vehicle body 16, and a mounting plate 60 is provided on the outer end portions of both front brackets 59. In addition, receiving members 62 are attached to the outer surface sides of the mounting plates 60, and the receiving surfaces 63 formed on the left and right receiving members 62 are opposed to the left and right inner sides of both front side stoppers 55. The front side stoppers 55 are configured to be slidable in the vertical direction with respect to the receiving surfaces 63 between the upper limit position A and the lower limit position B.
[0030]
Similarly, a pair of left and right rear brackets 65 are provided on both sides of the rear portion of the rear vehicle body 16, mounting plates 60 are provided on the outer ends of both rear brackets 65, and on the outer surface sides of these mounting plates 60, A receiving member 62 is attached, and receiving surfaces 63 formed on the left and right receiving members 62 are opposed to the left and right inner sides of both rear side stoppers 56. The both rear side stoppers 56 are configured to be slidable in the vertical direction with respect to the receiving surfaces 63 between the upper limit position A and the lower limit position B.
[0031]
Further, as shown in FIG. 3, the rear vehicle body 16 is provided with ten proximity switches KS1 to KS10.
The proximity switches KS1 and KS2 are both switches (an example of detection means) that detect the completion of pallet loading, and the front and rear stands 33 are erected and attached to the support surface facing the lift frame 30. The proximity switches KS3 and KS4 both detect that the lift frame 30 is at the upper limit position, and the proximity switches KS5 and KS6 both detect that the lift frame 30 is at the lower limit position. The proximity switches KS7 and KS8 both detect that the stand 33 is standing (up), and the proximity switches KS9 and KS10 both detect that the stand 33 is lying down (down).
[0032]
FIG. 9 shows a hydraulic circuit of the lift cylinder 31 and the stand cylinder 34.
A lift cylinder main valve 71 that supplies pressure oil to the lift cylinder 31 is provided, and a stand cylinder main valve 72 that supplies pressure oil to the stand cylinder 34 is provided. Each of these main valves 71 and 72 is composed of a 6-port 3-position switching valve (2 ports are not used), and is automatically controlled as a pilot valve that supplies control oil for switching the valve position of these main valves 71 and 72. A valve and a manual control valve are provided.
[0033]
As this automatic control valve, a lift cylinder pilot valve 73 and a stand cylinder pilot valve 74 are provided. Further, as a manual control valve, an (operation) lever of the lift frame 30 operated by an operator (an example of manual operation means of the lifting device) Manual operation lowering valve 75 and manual operation raising valve 76 which are driven (open / close) according to the position (lowering position-upward position), and (operation) lever of the stand 33 operated by the operator (manual operation means of the stand device) The manual operation lowering valve 77 and the manual operation raising valve 78 that are driven (opened / closed) in accordance with the position (lowering position−upward position) of FIG.
[0034]
The main valves 71 and 72 are supplied with pressure oil from a steer pump (not shown), and the pilot valves 73, 74, 75, 76, 77 and 78 are supplied with control oil from a brake pump (not shown). ing.
[0035]
This hydraulic circuit realizes the following operations.
[Retraction of rod of lift cylinder]
When the solenoid 73A (see FIGS. 11 and 14) on the lower side of the lift cylinder pilot valve 73 is energized or when the manual operation lower valve 75 is opened according to the operation of the operation lever of the lift frame 30, the lift cylinder pilot is opened. The control oil is supplied from the valve 73 or the manually operated lowering valve 75 to the control hydraulic port on the lowering side of the lift cylinder main valve 71, so that the pressure oil is supplied to the cylinder chamber for retracting the rod 31 a into the three cylinders 31. The rod 31a of the lift cylinder 31 is retracted.
[Protrusion of lift cylinder rod]
When the solenoid 73B (see FIGS. 11 and 14) on the lift side of the lift cylinder pilot valve 73 is energized or when the manual operation lift valve 76 is opened in response to the operation of the operation lever of the lift frame 30, the lift cylinder pilot is opened. The control oil is supplied from the valve 73 or the manually operated lift valve 76 to the control hydraulic port on the lift side of the lift cylinder main valve 71, so that the pressure oil is supplied to the cylinder chambers for projecting the rods 31 a to the three cylinders 31. The rod 31a of the cylinder 31 is protruded.
[Retraction of stand cylinder rod]
When the descending solenoid 74A (see FIGS. 11 and 14) of the stand cylinder pilot valve 74 is energized, or when the manual operation lowering valve 77 is opened according to the operation of the operation lever of the stand 33, the stand cylinder pilot valve. 74 or a manually operated lowering valve 77 supplies control oil to the lower control hydraulic port of the stand cylinder main valve 72, so that pressure oil is supplied to the cylinder chamber for retracting the rod 34 a into the two cylinders 34. The rod 34a of the cylinder 34 is retracted.
[Stand cylinder rod protrusion]
When the solenoid 74B (see FIGS. 11 and 14) on the rising side of the stand cylinder pilot valve 74 is energized, or when the manual operation raising valve 78 is opened in response to the operation of the operation lever of the stand 33, the stand cylinder pilot valve. The control oil is supplied from 74 or the manual operation raising valve 78 to the control hydraulic port on the raising side of the stand cylinder main valve 72, so that the pressure oil is supplied to the cylinder chamber for projecting the rod 34 a to the two cylinders 34. 34 rods 34a are projected.
[0036]
Further, as shown in FIG. 10, an operation panel 81 for loading / unloading work is provided in the cab 21.
On the operation panel 81, an automatic / manual selection switch 82 (an example of automatic / manual selection means) for selecting whether the loading / unloading operation is performed in the manual mode or the automatic mode, and the loading operation / unloading operation are performed. A loading / unloading selection switch 83 (an example of a selection operation means for loading / unloading work) to be selected is provided. The loading / unloading selection switch 83 is provided with a loading lamp (an example of display means) 84 that is turned on when the loading operation is completed and an unloading lamp 85 that is turned on when the loading operation is completed. The automatic / manual selection switch 82 and the loading / unloading selection switch 83 are constituted by handle type operation switches.
[0037]
Further, on the operation panel 81, a stand lowering lamp 86 that is turned on when the stand 33 is lowered (sideways), a stand raising lamp 87 that is turned on when the stand 33 is raised (standing), and the lift frame 30 is raised. A lift raising lamp 88 that is turned on at the position (upper limit position) is provided.
[0038]
The switches 82 and 83 and the lamps 84, 85, 86, 87, and 88 of the operation panel 81 are connected to a sequencer 91 (an example of control means) that is a computer provided in the operation room 21 as shown in FIG. Yes. The proximity switch KS1 to KS10 is connected to the sequencer 91, and the solenoids 73B and 73A of the lift cylinder pilot valve 73 and the solenoids 74B and 74A of the stand cylinder pilot valve 74 are connected.
[0039]
The operation of the sequencer 91 will be described based on the sequences of FIGS.
12 and 13 are auxiliary relay (CR) sequences that amplify the operation (ON) of the proximity switches KS1 to KS10. For example, when the proximity switch KS1 operates, the auxiliary relays (CR11, 12, 13, and 14) are activated. Energized, the a contact of these auxiliary relays (CR11, 12, 13, 14) is turned on, and the b contact is turned off.
[0040]
As shown in FIG. 14, when automatic is selected by the automatic / manual selection switch 82, the operation by the loading / unloading selection switch 83 is executed.
[Lights on]
Loading lamp 84: Lights when the proximity switches KS1 and KS2 are operating.
[0041]
Lift raising lamp 88 .. Lights up when the proximity switches KS3 and KS4 are operating.
Unloading lamp 85: Lights when the proximity switches KS5 and KS6 are both operating.
[0042]
Stand raising lamp 87: Turns on when the proximity switches KS7 and KS8 are operating.
Stand lowering lamp 86: Turns on when the proximity switches KS9 and KS10 are operating.
[Loading work]
1. When the loading / unloading selection switch 83 is selected to the “loading” side, the contact of the switch 83 shown in FIG. 14 (on when loading) is connected, and not “loading complete” (both KS1 and 2 are off) ”(Both KS3 and 4 are off), and in a state where the lift is not being lowered (the auxiliary relay CR0 is on), the lift side solenoid 73B of the lift cylinder pilot valve 73 is excited, and the rod 31a of the lift cylinder 31 is Protruding.
[0043]
When the lift frame 30 reaches the upper limit position A, both the proximity switches KS3 and KS4 operate and their b contacts (CR32 and CR43) are turned off, the lift side solenoid 73B of the lift cylinder pilot valve 73 is de-energized, and the lift cylinder The protrusion of the 31 rod 31a is stopped.
[0044]
2. As described above, when the proximity switches KS3 and KS4 operate together and their contact a (CR33 and CR42) is turned on, the stand cylinder pilot valve 74 is lifted in a state that is not "stand up" (both KS7 and 8 are off). The solenoid 74B is excited, the rod 34a of the stand cylinder 34 protrudes, and the two stands 33 stand up.
[0045]
When the stand 33 is raised, the proximity switches KS7 and KS8 are operated, and their b contacts (CR72 and CR83) are turned off, the rise side solenoid 73B of the stand cylinder pilot valve 74 is de-energized, and the rod of the stand cylinder 34 The protrusion of 34a is stopped.
[0046]
3. As described above, when the proximity switches KS7 and KS8 are operated together and their contact a (CR73 and CR82) is turned on, it is not “loading completion” (both KS1 and 2 are turned off) and not “lift lowering” (KS5, 6). In the off state), the descending solenoid 73A of the lift cylinder pilot valve 73 is excited, and the rod 31a of the lift cylinder 31 is retracted.
[0047]
When the rod 31a of the lift cylinder 31 is retracted, the proximity switches KS5 and KS6 are operated, and the contact b (CR53 and CR62) is turned off, the descending solenoid 73A of the lift cylinder pilot valve 73 is de-energized, and the lift Retraction of the rod 31a of the cylinder 31 is stopped.
[Unloading work]
1. When the loading / unloading selection switch 83 is selected to the “unloading” side, the contact of the switch 83 shown in FIG. 14 (on at unloading) is connected, not “lift down” (both KS5 and 6 are off), “ The lift side solenoid 73B of the lift cylinder pilot valve 73 is excited and the rod 31a of the lift cylinder 31 is protruded in a state where the lift cylinder pilot valve 73 is not "lifting up" but not "lifting down".
[0048]
When the lift frame 30 reaches the upper limit position A, both the proximity switches KS3 and KS4 operate and their b contacts (CR32 and CR43) are turned off, the lift side solenoid 73B of the lift cylinder pilot valve 73 is de-energized, and the lift cylinder The protrusion of the 31 rod 31a is stopped.
[0049]
2. As described above, when the proximity switches KS3 and KS4 are operated together and the contact a (CR33 and CR42) is turned on, the stand cylinder pilot valve 74 is lowered when it is not "stand down" (both KS9 and 10 are off). The solenoid 74A is excited, the rod 34a of the stand cylinder 34 is retracted, and the two stands 33 lie down.
[0050]
When the stand 33 is in the sideways state, the proximity switches KS9 and KS10 are operated and the contact b (CR72 and CR83) is turned off, the descending solenoid 74A of the stand cylinder pilot valve 74 is de-energized, and the stand cylinder 34 Retraction of the rod 34a is stopped.
[0051]
3. When the proximity switches KS9 and KS10 operate together as described above and their contact a (CR92 and CR103) is turned on, the lower side of the lift cylinder pilot valve 73 is not "loading complete" but "lifting down". The solenoid 73A is excited and the rod 31a of the lift cylinder 31 is retracted.
[0052]
When the rod 31a of the lift cylinder 31 is retracted, the proximity switches KS5 and KS6 are operated, and the contact b (CR53 and CR62) is turned off, the descending solenoid 73A of the lift cylinder pilot valve 73 is de-energized, and the lift Retraction of the rod 31a of the cylinder 31 is stopped.
[0053]
The operation of the above configuration will be described. It is assumed that automatic is selected by the automatic / manual selection switch 82, the stand 33 is laid down, and the lift frame 30 is lowered to the lower limit position B. At this time, the “stand down” lamp 86 is lit.
[0054]
{Circle around (1)} First, as shown in FIG. 5, the worker moves the transport vehicle 1 backward, and inserts the lift frame 30 together with the rear vehicle body 16 into the insertion portion 6 of the pallet 2. At this time, the stopper main body 38 of the left and right front stopper devices 35 abuts the front end of the pallet main body 3 from the front, the stopper main body 38 is pushed forward, and the swing arm 37 swings slightly in the other direction D. Then, the pressing body 49 comes into pressure contact with the front end of the buffer member 48. Thereby, the shock when the stopper main body 38 comes into contact with the front end portion of the pallet main body 3 is reduced by the buffer member 48. At this time, a space having a constant height h is formed between the lift frame 30 at the lower limit position B and the supported surface 7 of the pallet 2.
[0055]
(2) Thereafter, the worker selects the loading / unloading selection switch 83 to the “loading” side. Then, the piston rod 31a of the lift cylinder 31 is protruded by the above operation of the sequencer 91, and the lift frame 30 is raised from the lower limit position B via the four-link mechanism 32. The lift frame 30 comes into contact with the supported surface 7 of the pallet 2 from below when the lift frame 30 rises from the lower limit position B by the constant height h. At this time, the front stopper device 35 rises together with the lift frame 30, but the pallet 2 is placed on the ground, so that the front sliding surface 42 of the stopper main body 38 faces the front end of the pallet main body 3. The lift frame 30 comes into contact with the supported surface 7 of the pallet 2 while being lifted by a certain height h. Subsequently, the lift frame 30 is further raised to reach the upper limit position A in a state of being in contact with the supported surface 7 of the pallet 2, whereby the pallet 2 is supported by the lift frame 30 and lifted from the ground. At this time, the front stopper device 35 is also lifted together with the lift frame 30, but the pallet 2 is also lifted and lifted by the lift frame 30, so that the front sliding surface 42 of the stopper body 38 is against the front end of the pallet body 3. There is no sliding.
[0056]
When the lift frame 30 is raised to the upper limit position A, the “lift lift” lamp 88 is turned on, and then the stand 33 is erected as shown in FIG. 1, and the lift frame 30 is held by the stand 33 at the upper limit position A. Is done. When the stand 33 stands up, the “stand up” lamp 87 is turned on and the “stand down” lamp 86 is turned off. Subsequently, the rod 31a of the lift cylinder 31 is retracted, the lift frame 30 and the pallet 2 are held by the stand 33 at the upper limit position A, the “lift lift” lamp 88 is turned off, and the “loading completion” lamp 84 is turned on. The
[0057]
(3) When the operator lifts the pallet 2 by the lift frame 30 and confirms that the “loading completion” lamp 84 is turned on, the worker moves the pallet 2 to the transport destination (destination) by traveling the transport vehicle 1. Carry. At this time, the transportation vehicle 1 is turned in the left-right direction by expanding and contracting the piston rod of the cylinder device 20 and turning the front vehicle body 12 around the longitudinal axis 19 with respect to the intermediate vehicle body 14. The
[0058]
When the transport vehicle 1 turns in the left-right direction as described above, a lateral load in the left-right direction acts on the lift frame 30 that supports the pallet 2 by centrifugal force. For example, as shown in FIG. 7, when the transport vehicle 1 turns left, a lateral load F in the right direction acts on the lift frame 30, and this lateral load F passes through the left and right front and rear side stoppers 55 and 56. And is received by the receiving surface 63. Similarly, when the transport vehicle 1 turns to the right, a lateral load in the left direction acts on the lift frame 30, and this lateral load is received by the receiving surface 63 via the right and left front and rear side stoppers 55 and 56. . Thereby, the left and right lateral loads can be sufficiently received. Further, not only the upper limit position A but also when the lift frame 30 is lowered to the lower limit position B, the lateral load is received by the receiving surfaces 63 via the front and rear side stoppers 55 and 56.
[0059]
(4) When the vehicle arrives at the transport destination (destination) of the pallet 2, the worker selects the loading / unloading selection switch 83 to the “unloading” side. Then, the piston rod 31a of the lift cylinder 31 is protruded by the above-described operation of the sequencer 91. The lift cylinder 31 again comes into contact with the lift frame 30 at the upper limit position A from below, and the lift frame 30 and the pallet 2 are held. “Up” lamp 88 is turned on and “loading completion” lamp 84 is turned off.
[0060]
When the lift frame 30 and the pallet 2 at the upper limit position A are again held by the lift cylinder 31, the rod 34 a of the stand cylinder 34 is retracted, the two stands 33 are laid sideways, and the lift frame 31 is moved only by the lift cylinder 31. 30 and the pallet 2 are held.
[0061]
When the stand 33 is in the sideways state, the “stand up” lamp 87 is turned off, the “stand down” lamp 86 is turned on, the rod 31a of the lift cylinder 31 is subsequently retracted, the lift frame 30 is lowered, and the lift The pallet 2 is unloaded from the frame 30 to the ground. The lift frame 30 is further lowered to the lower limit position B, the “lift lift” lamp 88 is turned off, and the “loading completion” lamp 85 is turned on.
[0062]
(5) The worker confirms that the pallet 2 has been wholesaled to the ground, confirms that the “unloading completion” lamp 85 is lit, drives the vehicle 1, and moves the rear vehicle body 16 below the eaves of the pallet 2. Escape.
[0063]
As described above, the loading operation and the unloading operation of the pallet 2 are automatically executed only by the selection operation of the loading / unloading selection switch 83, thereby simplifying the operation of the worker, and thus the loading operation of the pallet 2 / The burden on workers during unloading work can be reduced.
[0064]
Further, when the loading operation is completed, the “loading completion” lamp 84 is turned on, so that the worker can confirm that the pallet 2 is securely held by the lift frame 30 and the stand 33, and the vehicle 1 can be relieved. The pallet 2 can be transported.
[0065]
In the above embodiment, the automatic / manual selection means and the selection operation means are configured by a handle type operation switch, but may be configured by a push button type switch. Moreover, although the control means is constituted by a sequencer, it may be constituted by an electric circuit actually connected by an electric wire using an auxiliary relay.
[0066]
In the above-described embodiment, the front stopper device 35 and the shock absorber 36 are provided as a pair of left and right (that is, two), respectively, but may be provided one or three or more.
[0067]
In the above embodiment, as shown in FIG. 4, the buffer member 48 made of an elastic member such as rubber is used. However, a hydraulic shock absorber may be used as the buffer member 48.
[0068]
In the above embodiment, two pairs of left and right side stoppers 55 and 56 are provided in the front-rear direction.
In the above embodiment, as shown in FIG. 7, the receiving surface 63 is opposed to the left and right inner sides of the side stoppers 55 and 56, but may be opposed to the left and right outer sides.
[0069]
In the above embodiment, as shown in FIG. 1, the vehicle body 10 is divided into the front vehicle body 12, the intermediate vehicle body 14, and the rear vehicle body 16 in three front and rear parts. It may be a type that does not divide.
[0070]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the burden on the worker when loading / unloading pallets.
[Brief description of the drawings]
FIG. 1 is a side view of a pallet carrying vehicle according to an embodiment of the present invention.
FIG. 2 is a plan view of the pallet carrying vehicle.
FIG. 3 is a layout diagram of proximity switches of the pallet carrying vehicle.
FIG. 4 is a side view of a front stopper device and a shock absorber of the pallet carrying vehicle.
FIG. 5 is a front side view of a lift frame of the pallet carrying vehicle, showing a state in which the lift frame is lowered to a lower limit position.
FIG. 6 is a front side view of a lift frame of the pallet carrying vehicle, showing a state in which the lift frame is lifted from a lower limit position and is in contact with a supported surface of the pallet.
FIG. 7 is a rear view of the pallet transport vehicle with the lift frame raised to an upper limit position, showing a front side stopper on the left side from the center line X, and a rear side stopper on the right side.
FIG. 8 is a rear view of the pallet transport vehicle with the lift frame lowered to a lower limit position, showing a front side stopper on the left side from the center line X and a rear side stopper on the right side.
FIG. 9 is a hydraulic circuit diagram of a lift cylinder and a stand cylinder of the pallet carrying vehicle.
FIG. 10 is a plan view of an operation panel of the pallet carrying vehicle.
FIG. 11 is a main part control configuration diagram of the pallet carrying vehicle.
FIG. 12 is a sequence of a sequencer of the pallet carrying vehicle.
FIG. 13 is a sequence of a sequencer of the pallet carrying vehicle.
FIG. 14 is a sequence of a sequencer of the pallet carrying vehicle.
[Explanation of symbols]
1 Pallet transport vehicle
2 Palette
6 Insertion section
7 Supported surface
10 body
30 Lift frame (support member)
31 Lift cylinder (lifting device)
33 Stand (Stand Device)
34 Stand cylinder (stand device)
35 Front stopper device
36 shock absorber
55, 56 Side stopper
63 Reception surface
71 Lift cylinder main valve
72 Stand cylinder main valve
73 Lift cylinder pilot valve
74 Stand cylinder pilot valve
81 Operation panel
82 Automatic / manual selection switch (automatic / manual selection means)
83 Loading / unloading selection switch (selection operation means)
84 Loading indicator lamp (display means)
91 Sequencer (control means)
KS1 to KS10 Proximity switch (detection means)
A Upper limit position
B Lower limit position
h Height from the lower limit lift frame to the supported surface of the pallet
H Raised height of pallet supported by lift frame at upper limit position

Claims (1)

At the rear of the vehicle body, a support member that lifts and supports the pallet, an elevating device that raises and lowers the support member between the upper limit position and the lower limit position, and a stand device that holds the front support member at the upper limit position are provided.
A vehicle for pallet transport that moves the vehicle body backward, inserts the support member into an insertion portion formed on the pallet, and supports and supports a supported surface formed on the pallet with the support member;
In the cab of the vehicle, there is provided a selection operation means for selecting a loading operation for supporting the pallet by the support member and an unloading operation for unloading the pallet from the support member,
When the loading operation is selected by the selection operation means, the support member is raised to the upper limit position by the lifting device, and then the support member is held at the upper limit position by the stand device, and then the lifting device is lowered, When the loading operation is selected by the selection operation means, the lifting device is raised to the upper limit position to support the support member, the stand device is then lowered, and then the lifting device is lowered to the lower limit position. Providing a control means,
In the cab of the vehicle, there is provided an automatic / manual selection means for selecting a manual mode in which the lifting device and the stand device are driven by manual operation means, and an automatic mode in which the lifting device and the stand device are driven by the control means,
When the manual mode is selected by the automatic / manual selection means, the lifting device and the stand device are manually driven to perform loading and unloading operations, and when the automatic mode is selected by the automatic / manual selection means The pallet carrying vehicle is characterized in that the lifting device and the stand device are automatically driven by the control means in response to a loading operation / unloading operation selection operation by the selection operation means .

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