JP2651738B2 - Safety equipment in cargo handling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention relates to a safety device in a cargo handling device provided in a cargo handling vehicle or the like.

(2) Conventional technology A conventional loading platform, a lifting platform provided on one side of the loading platform via a lifting mechanism so as to be movable up and down, the loading platform, and a slide deck movable between the lifting platform at the ascending position. There is a known cargo handling apparatus which is capable of loading and unloading a load placed on a slide table between the ground and a loading bed by raising and lowering the lift table and sliding movement of the slide table (see JP-A-63-219434).

(3) Problems to be Solved by the Invention By the way, in such a cargo handling device, the loading platform and the lifting platform are leveled so as to be flush with the loading platform, and then the slide platform is slid between the loading platform and the lifting platform. However, if the sliding platform is moved when the loading platform and the lifting platform are not flush, damage to the sliding platform, the lifting platform, etc.
There is a possibility that they may be damaged or their smooth operation may be hindered.

Further, the one disclosed in the above publication raises and lowers the lifting platform between the loading platform and the ground, and does not have a structure in which the lifting platform can be raised above the upper limit position which is flush with the loading platform. However, if such a structure is adopted, there are the following problems. In other words, the reciprocating drive device and the slide table on the elevating table remain in a connected state, or at least the connecting portion of the reciprocating drive device remains in the elevating area of the elevating table even when their connection is released. If the erroneous lifting platform is erroneously raised above the loading platform, there is a disadvantage that the connecting portion is damaged or damaged or causes a failure.

The present invention has been made in view of such circumstances, and automatically suppresses the slide movement of the slide table unless the loading platform and the lifting platform are flush with each other, and retreats the connecting member of the reciprocating drive device to the loading platform side. It is an object of the present invention to provide a new safety device for a cargo handling device, in which the above-mentioned problem can be solved by suppressing the lifting of the lifting platform unless it is performed.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a loading platform, a lifting platform provided on one side of the loading platform so as to be able to move up and down, and A lifting mechanism that can be driven up and down both upward and downward, a slide table that is provided on the loading platform and that can be transferred onto the lifting platform, and a connecting member that can be detachably connected to the slide table at its tip. A reciprocating drive device disposed on the loading platform so as to be able to advance and retreat with respect to the lifting platform. When the loading platform and the lifting platform are flush with each other, the slide platform is operated by the reciprocating drive device connected to the slide platform. The loading and unloading device can be transferred to a loading platform, and in the cargo handling device, a level position detecting means capable of detecting that the lifting platform is not flush with the loading platform is provided by a slide platform based on a detection signal of the level position detecting means. Sla that regulates the slide movement of Movement control means, standby position detecting means for detecting that the connecting member of the reciprocating drive device is on standby on the loading platform side, and a lift switch for inputting a lift operation to an arbitrary lift position of the lift table. And lifting control means for restricting the raising and lowering operation of the lifting platform unless receiving a detection signal from the standby position detecting means even when the switch is in the input state. .

As the level position detecting means and the slide position detecting means, other effective detectors such as a proximity switch as well as a limit switch are used.

(2) Operation According to the above configuration, when the level position detecting means detects that the elevating platform and the loading platform are not flush, the detection signal is applied to the sliding movement control means of the sliding platform, and the means is applied to the sliding platform. The slide movement of the slide table is automatically controlled, and as a result, the reciprocation of the slide table is performed smoothly, safely and efficiently.

Further, when the connecting member of the reciprocating drive device retreats into the loading platform and waits, a detection signal of the standby position detecting means that detects this state is input to the lifting control device, whereby the lifting platform is
Based on the instruction input of the elevating switch, the elevating control can be performed to an arbitrary elevating position.

(3) Example Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a rear side view of a cargo handling vehicle V provided with the cargo handling device of the present invention, and FIG. 2 is a plan view thereof. In these figures, a loading platform A is formed at the rear of the cargo handling vehicle generally indicated by the reference character V on the vehicle body B, and a pair of parallel loading platforms is provided on the loading surface of the loading platform A at intervals in the vehicle width direction. Guide rail 1,
1 is laid along the vehicle length direction, and a pair of parallel guide posts 2,
2 are installed vertically, and these guide posts 2, 2
Guides the lifting and lowering of a lifting table Fe to be described later. On the vehicle body B, a slide table cylinder 3 as a driving device is arranged in the front-rear direction, reciprocating at the center in the vehicle width direction. The slide table cylinder 3 is supported by the vehicle body B, Is provided integrally with a flat bifurcated hook-shaped connecting member 4. The connecting member 4 penetrates the stepped rising wall A1 at the front end of the loading platform A by the extension operation of the slide platform cylinder 3, and the loading platform A It can protrude upward (FIG. 8).

The integrated guide posts 2, 2 have a substantially vertical guideway.
5, 5 are formed, and a pair of elevating members 6, 6 are respectively engaged with the guide paths 5, 5 via guide rollers 7, 8 provided thereat so as to be vertically movable. Below the pair of elevating members 6, 6, the base ends on both sides of the elevating table Fe are supported by the support shafts 9, 9 at the extended position (solid line position in FIG. 1) and the storage position (dashed line position in FIG. 1).
The shaft is rotatably supported up and down.

The lifting table Fe has a concave part that is open rearward at the center of the trailing edge.
A pair of guide rails 11, 11 each having a U-shaped cross-section that matches the guide rails 1, 1 in the longitudinal direction are integrally laid on both left and right sides thereof. I have.

Further, a pair of stoppers 12, 12 project upward from the rear end of the elevating table Fe, and these stoppers 12, 12 are abutting pieces 72, 72 (fifth, (FIG. 6), the retreat position of the slide table Ds can be regulated. Further, a pair of locked portions is provided on the inner surface of the concave portion 10.
13 and 13 are provided integrally, and these locked portions 13 and 13 can be engaged with a securing hook 70 (FIGS. 5 and 6) of the slide base Ds described later. Engagement pieces 14, 14 are integrally protruded from base ends on both sides of the lifting table Fe. These engagement pieces 14, 14 are provided with position-adjustable locking members 15, provided on the lower end of the lifting member 6. The lifting table Fe is held at the substantially horizontal projecting position by engaging with the lifting table 15. Locking pins 19, 19 are protrudingly provided on both sides of the tip of the lifting table Fe, and these locking pins 19, 19 are rotatably provided on the guide posts 2, 2.
The lifting table Fe is held in the upright storage position by engaging with 23,23.

The lifting table Fe is controlled to move up and down along the pair of guide columns 2, 2 by a lifting mechanism E provided on the vehicle body B.
Next, the structure of the elevating mechanism E will be described mainly with reference to FIG. 9. A single-acting elevating cylinder 16 is provided on the vehicle body B, and a pair of moving pulleys 17
7 'is supported. On both sides of the lifting cylinder 16, the base ends of two wire ropes 18 and 18 ′ are attached to the vehicle body B, and one of the wire ropes 18 is connected to one of the moving pulleys 1.
7, fixed pulleys 20 and 21 supported on the vehicle body B, and fixed pulleys 22 supported on the upper part of the one guide post 2 and then connected to one elevating member 6 and the other wire The rope 18 ′ is the other moving pulley 17 ′, a fixed pulley supported by the vehicle body B.
24 and a fixed pulley 25 supported on the upper part of the other guide column 2
And is connected to the other lifting member 6. Therefore, if the single-acting lifting cylinder 16 is extended and retracted, the lifting table Fe can be raised and lowered along the pair of guide columns 2, 2 via the two wire ropes 18, 18 '. If the lifting cylinder 16 is made free, the lifting table Fe is lowered by its own weight.

On the receiving surface of the loading platform A, a slide platform Ds that can be transferred onto the lifting platform Fe is provided so as to be movable back and forth.

As shown in FIG. 8, the slide base Ds is constructed by integrally laying a load receiving plate 30 made of an iron plate or the like on a rectangular base frame 29. As shown in FIGS. 3 and 5, the underframe 29 is formed as a highly rigid rectangular frame by integrally connecting a plurality of cross members 28 to the left and right vertical beams 27, 27. The rear end of the load receiving plate 30 is formed on an inclined surface 31 that is inclined downward toward the rear.

As shown in FIG. 8, a pair of left and right holding frames 32, 32 are erected along the front-rear direction on the left and right sides of the load receiving plate 30, and these holding frames 32, 32 have a pair of aircraft serving as cargo. Tires T, T
(FIGS. 1 and 2) are held tight by the cords 33, 33.

Guide frames 35, 35 made of an angle material are fixed to the left and right of the frame 29 of the slide table Ds, respectively, and a plurality of lateral regulating rollers 36 are fixed to these guide frames 35, 35.
And the upper and lower direction regulating rollers 37 に are rotatably supported, respectively, and these rollers 36 ‥ and 37 係 合 rollably engage with the guide rails 1, 1 on the loading platform A to slide freely.
To guide you back and forth.

As clearly shown in FIGS. 3 and 5, at the center of the front end of the underframe 29 of the slide base Ds, a flat U-shaped receiving part 38 opening at the front edge is provided.
Is formed in the receiving portion 38.
The connecting member 4 in the form of a forked hook at the distal end can enter, and an abutment surface 381 that can abut the distal end surface 41 of the connecting member 4 is formed on the inner surface of the receiving portion 38.

A connecting link mechanism 39 that forms a connecting device J for connecting the slide base Ds and the slide base cylinder 3 in cooperation with the connecting member 4 at the tip of the slide base cylinder 3; A securing link mechanism 40 that constitutes a securing device L for securing the slide table Ds on the elevating table Fe is provided in cooperation with the stopper 12 and the locked section 13.

Next, the configurations of the connecting link mechanism 39 and the securing link mechanism 40 will be described with reference to FIGS.

First, the structure of the connecting link mechanism 39 will be described. As shown in FIGS. 3 to 6 and 10, an operation of extending laterally through a plurality of bearing bosses 41, 41 at the rear of the frame 29 of the slide base Ds. The lever 42 is rotatably supported, and this operation lever
One end of 42 is bent at a substantially right angle to form a manual lever 43. An arm 44 is welded to the center of the operation lever 42,
One end of a connection rod 45 whose length can be adjusted is connected to the tip of the arm body 44. The connecting rod 45 is connected to the swing lever 46 by extending the slide base Ds forward. The swing lever 46 has a middle portion pivotally supported by a bracket 47 projecting from the cross member 28 at the front of the slide base Ds with a pivot 48 so as to be swingable. The connecting rod 49 is connected. The front portion of the connecting rod 49 extends downward in the receiving portion 38, and at the front end thereof, an arm 51 integral with a connecting shaft 50 rotatably supported at the center of the receiving portion 38. Are linked. A connecting member 52 is fixed to the connecting shaft 50, and the connecting member 52 is connected to the connecting position (a) shown in FIG. 3 and the releasing position (b) shown in FIG. ) Can rotate about 90 °. As shown in FIGS. 3 and 4, when the manual lever 43 is
When the lever 42 is rotated clockwise in FIG. 4, the connecting rod 45 is pulled rearward (in the direction of the arrow (X) in FIG. 3), and the connector 52 is connected to the vehicle via the swing lever 46 and the connecting rod 49. It is held at a lock position (a) orthogonal to the traveling direction of V. When the manual lever 43 is erected as shown in FIGS. 5 and 6 and the operation lever 42 is erected and rotated as shown in FIG.
Is pushed forward (in the direction of the arrow (X ') in FIG. 5), and the connector 52 is rotated and held at the unlocked position (b) substantially parallel to the traveling direction of the vehicle V via the swing lever 46 and the connecting rod 49. Is done.

The connection link mechanism 39 is provided with a connection release holding mechanism 54 for holding it at the connection release position.

Next, the structure of the mechanism 54 will be described with reference to FIGS. 3 to 7 and FIG. 10. A lock pin 55 protrudes from the free end of the swing lever 46. On the other hand, a lock arm 56 is pivotally supported on the cross member 28 of the slide base Ds in the vicinity of the free end of the swing lever 46 so as to be swingable. A notch 58 is formed which can be disengaged from the notch 58. The lock arm 56 includes:
The other end of a tension spring 59 whose one end is locked to the slide base Ds is engaged, and the elastic force of this tension spring 59 causes the connector 52 to move to the connection release position (b) as shown in FIG. ), And when the connecting member 4 of the slide base cylinder 3 deviates from the receiving portion 38, the notch 58 is urged to a position engaged with the lock pin 55 to move the connecting device J to the uncoupling position. Can hold. A free end of the lock arm 56 is connected via a link 60 to one end of a bell crank 62 which is rotatably supported 61 on the receiving portion 38 of the slide base Ds. A roller 63 is supported rotatably. The rollers 63 are provided on the slide table cylinder 3 as shown in FIGS.
Is extended, and when the connecting member 4 at the tip thereof enters the receiving portion 38 of the slide base Ds, the connecting member 4 is at a position where it can engage with the side surface thereof, whereby the bell crank 62 is rotated counterclockwise, and The arm 56 is provided with a tension spring 59 as shown in FIGS.
Is held in the unlocked position against the spring force of.

Next, with reference to FIGS.
The structure of the lashing link mechanism 40 of the lashing device L for lashing upwards will be described. Arms 65, 65 forming a pair on the left and right of the connecting rod 45 are fixed to the operation lever 42,
These arms 65, 65 have lashing rods 66, 66 of adjustable length.
These securing rods 66, 66 extend forward, and the other ends thereof are rotatably supported by the cross members 28 of the slide base Ds via brackets 67, 67 so as to be rotatable. It is pivotally connected to arms 69, 69 integral with 68, 68. The lashing shafts 68, 68 have a pair of downward lashing hooks 7 respectively.
0,70 are fixed, and these lashing hooks 70,70
e can be detachably engaged with the locked portions 13, 13, respectively. Thus, when the manual lever 43 integral with the operation lever 42 is in the upright position as shown in FIGS. 1, 5, and 10,
The securing hooks 70, 70 are rotated clockwise and are at positions where they are engaged with the locked portions 13, 13 of the lifting table Fe. Therefore, it can be easily visually confirmed from the outside that the slide base Ds is fixed on the lift base Fe by the standing position of the manual lever 43.

An abutment piece 72 is fixed to the back surface of the inclined surface 31 of the slide base Ds, and the abutment piece 72 is connected to the slide base Ds as shown in FIGS.
When is moved onto the lifting table Fe, it can engage with the stopper 12 fixed to the rear of the lifting table Fe to regulate the rear position of the slide table Ds.

FIG. 11 shows a hydraulic circuit diagram C of the moving slide cylinder 3 of the slide table Ds and the elevating cylinder 16 of the elevating table Fe. In this circuit diagram C, oil passages 74 and 75 connected to oil chambers a and b of the slide base cylinder 3 are connected to a hydraulic pump 77 or an oil sump 78 driven by a motor M via an electromagnetic switching valve 76, and An oil passage 79 connected to the oil chamber c of the lifting cylinder 16 is connected to a hydraulic pump 77 or an oil reservoir 78 via an electromagnetic direction control valve 81 and an electromagnetic switching valve 80.

In FIG. 11, 82 to 85 are relief valves, and 86 is an orifice.

In FIG. 11, when the solenoid switching valve 76 is switched to the right position by excitation of the solenoid Sole, the slide base cylinder 3 is extended, and when it is switched to the left position by excitation of the solenoid Solf, the slide base cylinder 3 is moved. Is contracted. If the electromagnetic switching valve 80 is switched to the left position by exciting the solenoid Solb while the electromagnetic direction control valve 81 is in the left position, the elevating cylinder 16 is extended, and the electromagnetic direction control valve 81 is moved to the right by exciting the solenoid Solc. In position, solenoid So
If the electromagnetic switching valve 80 is switched to the right position by the excitation of la, the pressure oil in the oil chamber c is returned to the oil reservoir 78 through the orifice 86, and the lifting cylinder 16 is slowly released by the weight of the lifting table Fe and the lifting member 6. Contracted.

FIG. 12 shows an arrangement of limit switches LS1 to LS5 provided on the cargo handling vehicle V in controlling the lifting and lowering of the lifting table Fe and the movement control of the slide table Ds, and the limit switch LS1 is connected to one of the guide posts. 2 in the middle of the back,
The lift switch Fe is operated when standing up and retracted to constitute storage position detection means for the lift table Fe. The limit switch LS2 is located at the center of the rear edge of the vehicle body B, and when the lift table Fe extends horizontally, the limit switch LS2 faces the loading table A. When it is in one position, it is operated to constitute a level position detecting means of the lift table Fe. Limit switches LS3 and LS4 are arranged side by side on the loading platform A, and the limit switch LS3 is operated by the lower surface of the connecting member 4 at the tip of the slide base cylinder 3 to constitute a standby position detecting means for the connecting member 4;
The LS4 is operated by a dog cam 26 formed on the lower surface of the slide base Ds, and constitutes a slide position detecting means of the slide base Ds. Further, the limit switch LS5 is provided at the front of the loading platform A, and is operated by the front of the sliding platform Ds to constitute storage position detecting means of the sliding platform Ds.

FIG. 13 is an electric circuit diagram of this embodiment, in which the elevator table Fe is controlled to elevate and lower, and an automatic positioning controller C2 having an elevating controller C1 having an elevating switch SW2 and a storage switch SW3, and Slide base operation switch SW1
And a slide movement control means C3 for the slide base Ds having As will be described in detail later, the elevation control means C1 performs an up / down switching operation of the elevation switch SW2, that is, the elevation table Fe by an instruction input.
Is controlled to move up and down along the guide posts 2, 2 to an arbitrary elevating position, and the automatic alignment control means C2
As will be described in detail later, the lifting table Fe moving up or down by the up / down switching control of the retract switch SW3 is
The lift table Fe is configured to be automatically stopped when it is flush with the slide table. Further, the slide movement control means C3 moves the slide table Ds between the loading table A and the lift table Fe by the expansion / contraction switching control of the slide table operation switch SW1. Control slide reciprocation.

FIG. 14 is a flowchart showing the operation sequence of this embodiment, and FIGS. 15 to 17 are rear side views showing the operation of this embodiment.

Next, the operation of this embodiment will be described with reference to FIGS.

In FIG. 15 (1), the empty slide table Ds is
The elevator Fe is held at the storage position. In this state, the cargo handling vehicle V is in a normal traveling state.

Thus, in this state, the slide base Ds is stored on the loading base A, the manual lever 43 is turned down and the securing device L is in the released state, while the connecting device J is in the connected state and contracted. The connecting member 4 at the end of the slide base cylinder 3 in the state is connected to the connector 52 of the connecting link mechanism 39. The front surface of the slide table Ds abuts against the stepped rising wall A1 of the vehicle body B, and the inner surfaces of the pair of claw pieces 42 of the connecting member 4 abut against one side of the connector 52. The slide table Ds is firmly fixed to a predetermined position on the vehicle body B by the collision. In this connection state, since the roller 63 at the tip of the bell crank 62 is engaged with one side surface of the connection member 4, the connection release holding mechanism 54 is in an inoperative state.

On the other hand, the elevating table Fe is raised by the extension operation of the elevating cylinder 16, and is held at the upright storage position. Then, the limit switch LS1 is on the "standing" side and is turned off, and the limit switch LS2 is also on the "non-planar" side of the lifting platform Fe and the loading platform A and is turned off.

When the lifting table Fe is tilted and loaded as shown by the arrow in FIG. 15 (2) to perform the cargo handling operation, and is extended to the unloading position, the upper surface of the lifting table Fe is flush with the receiving surface of the loading table A. . And in this state, the limit switch LS1 is ON, that is,
And the limit switch LS2 is ON, that is,
Switch to the side. Here, when the main switch MS is turned on, the pilot lamp Lp (provided on the driver's cab or the like) is lit to indicate that the slide table Ds is operable.

Next, when the slide base operation switch SW1 is switched to the upper side, that is, the “extended” side, the relay RM is energized, the normally open relay switch Rm is closed, the motor M is driven, and the hydraulic pump is driven.
77 is started. Also, the solenoid Sole is excited, and the 15th
As shown in FIG. 3C, the slide base cylinder 3 is extended, and the slide base Ds is transferred from the loading base A to the lift base Fe. At this time, as shown in FIGS. 5 and 6, the slide table Ds is stopped by the abutment piece 72 at the rear end thereof abutting against the stopper 12 at the rear end of the elevating table Fe, and the retreat position of the slide table Ds is regulated. .
Here, if the manual lever 43 is raised in the direction of R in FIGS. 6 and 15 (3), the securing hooks 70 and 70 are turned downward (see FIGS. 3 and 4).
The slide table Ds is fixed to the lift table Fe by engaging with the locked parts 13 of the lift table Fe. Further, the connecting rod 45 is pressed in the direction of FIG. 5 (X ') by the upright operation of the manual lever 43, so that the connecting link mechanism 39 is released from the connection and the connecting
52 is rotated about 90 ° in the connecting member 4 and the connecting device J is automatically in the disconnected state (FIGS. 4 and 5), and the connecting state between the slide base Ds and the connecting member 4 of the slide base cylinder 3 is released. Is done.

When the slide table Ds is transferred onto the lifting table Fe, the connecting member 4 is separated from the limit switch LS3, so that the switch LS3 is turned off and the limit switch LS4 is turned on.
It is still in a state.

Here, if the slide base operation switch SW1 is switched to the lower side, that is, the "retraction" side, the solenoid Solf is energized, the electromagnetic switching valve 76 is switched to the left side, and the slide base cylinder 3 contracts. In this case, the connecting member 4 at the tip of the slide base cylinder 3 is disengaged from the connector 52 and retreats to the front of the vehicle V, so that the roller 63 at the tip of the bell crank 62 is disengaged from the side surface of the connecting member 4, whereby the connection release holding mechanism The lock arm 56 of the 54 is operated by engaging with the lock pin 55, and the connection device J is securely held at the connection release position (FIG. 7).

When the lift switch SW2 is turned on either "up" or "down", the connecting member 4 of the cylinder 3 is limited during the contraction of the slide table cylinder 3 as shown in FIG. 15 (4). Switch LS3 is turned ON, and relay R3
Is energized, the normally closed relay switch R3-1 is turned off, and the energization of the solenoid Solf is released. Therefore, the slide base cylinder 3 stops during its contraction, that is, at the standby position shown in FIG. 15 (4). O of the aforementioned limit switch LS3
By N, the lift control means C1 can be operated by switching control of the lift switch SW2, that is, the relay R3 is activated by the "up" side connection of the lift switch SW2, and the relay R2 is closed by closing the normally open relay switch R3-4. The normally open relay switches R2-1 and R3-1 are both closed, the solenoid Solb is excited, the electromagnetic solenoid valve 80 is switched to the left position, the elevating cylinder 16 is extended, and the elevating table Fe is raised. Can be done.

When the lifting switch SW2 is switched to the “down” side, the normally open relay switches R2-2 and R3-3 are closed, and the solenoids Sola and S3 are opened.
olc are both excited and the electromagnetic switching valve 80 and the direction control valve 81
Can be switched to the right position to lower the elevator Fe.

Therefore, as shown in FIG. 15 (4), when the slide table Ds is completely transferred on the lift table Fe and the connecting member 4 is retracted to the standby position and the limit switch LS3 is turned on, the lift control means The lifting table Fe can be freely raised and lowered along the guide posts 2, 2 by the up-down switching connection of the lifting switch SW2 of C1.

Next, with reference to FIGS. 16 (1) and (2), a description will be given of a process of loading a cargo on the platform Pl, that is, an aircraft tire T on the carrier A of the cargo handling vehicle V.

Raise the elevator Fe as described above, and
16 When the elevation switch SW2 is turned off at the same level as the upper surface of the platform Pl as shown in FIG. 1A, the solenoids Sola, Solb, and Solc are all de-energized, and the elevation of the elevation table Fe rises. Stopped. Here, as shown in FIG. 16 (1), the cargo T on the platform Pl is loaded on the slide Ds on the lift Fe as shown by the solid line from the chain line.

Next, when the storage switch SW3 is connected to the "lower" side in order to load the cargo T on the slide table Ds onto the loader A, the limit switch LS2 is switched to the upper side, that is, to the "not flush" side with the lift table. The normally closed relay switch R5-3 is kept ON (relay switch R2-2 is already ON) by the release of the bias of the relay R5, and the solenoid So
Both la and Solc are excited, and the electromagnetic switching valve 80 and the electromagnetic directional control valve 81 are both switched to the right, and the oil chamber a of the elevating cylinder 16 communicates with the oil sump 78 so that the tire T is loaded and slid. The table Ds descends by its own weight together with the lifting table Fe.

When the lifting platform Fe is lowered to a position flush with the loading platform A of the vehicle V, the limit switch LS2 is turned on to the lower side, that is, the "flush" side, so that the relay R5 is energized, and the normally closed relay switch R5-3. Turns off solenoids Sola and Solc
Are non-excited, and the electromagnetic switching valve 80 and the electromagnetic direction control valve
81 returns to the neutral position, and the lifting table Fe stops at a level with the loading table A.

As described above, the automatic positioning control means C2 is operated by the up / down switching control of the storage switch SW3, and the lifting table Fe can be automatically stopped at the same level as the loading table A.

Here, when the slide base operation switch SW1 of the slide movement control means C3 is turned on to the "extend" side, the solenoid Sole is urged and the slide base cylinder 3 is extended, and the connecting member 4 at the end thereof is connected to the lift base Fe. Into the receiving part 38 of. At this time, the limit switch LS3 is turned off. When the manual lever 43 is operated to fall down, the connecting link mechanism 29 of the connecting device J is operated as described above, and the connecting device J is connected, that is, the connecting member 4 and the connecting member 52 are connected, and the sliding is performed. The table cylinder 3 and the slide table Ds are connected to each other, and in conjunction with this, the connection release holding mechanism 54 is in an inoperative state. Further, the securing device L is in the released state, and the securing hooks 70, 70
Is disengaged from the locked portions 13, 13, and the slide table Ds and the lift table Fe are in a free state.

Here, when the slide base operation switch SW1 is turned on to the lower side, that is, the "retraction" side, the solenoid Solf is excited, the electromagnetic switching valve 76 is switched to the left side, and the slide base cylinder 3 is contracted. Thus, as shown in FIG. 16 (2), the slide table Ds is transferred and stored on the loading platform A, and the load thereon, that is, the tire T is loaded on the loading vehicle V. In this state, the limit switch LS4 is released from the pressing of the dog cam 26 on the lower surface of the slide base Ds and returns to the ON state.At the same time, the limit switch LS5 is also turned on by the slide base Ds, so that the relay R2 is energized and the normally open relay switch R2 -1 is closed.

When the loading of the tires T into the cargo handling vehicle V is completed as described above, the lifting platform Fe is raised and stored as shown by the arrow in FIG. 16 (2), and the cargo handling vehicle V can travel.

By the way, when the lift table Fe is shifted downward from a predetermined position due to oil leakage of the lift cylinder 16 during traveling of the cargo handling vehicle, and the lift table Fe is extended to the use position, FIG. 16 (2) As shown by the dashed line, a level difference occurs between the loading surface of the loading platform A and the upper surface of the lifting platform Fe. However, at the storage position of the slide platform Ds, both the limit switches LS4 and LS5 are ON as described above. Therefore, if the storage switch SW3 is connected `` up '', the solenoid Solb is excited, the electromagnetic switching valve 80 switches to the left position, extends the lifting cylinder 16, and makes the lifting table Fe flush with the loading table A. Can be raised.

By the way, by the operation of the slide movement control means C3,
Assuming that the slide table Ds, which should have been transferred onto the lift table Fe, is straddling between the lift table Fe and the loading platform A for some reason,
If the lifting table Fe is moved up and down in this state, the lifting table and other members may be damaged or damaged. In this case, the dog cam 26 on the lower surface of the slide table Ds extending between the lifting table Fe and the loading table A is connected to the limit switch LS4. And press this to the "when straddling the loading platform and elevator" side, that is, OFF
To the side. As a result, the relay R2 is de-energized,
Since the normally-open relay switches R2-1 and R2-2 are both switched to the open state, the solenoids Solb and Sola are both de-energized, making it impossible to lift the lifting table Fe. It can be performed safely.

Next, with reference to FIGS. 17 (1) and 17 (2), a description will be given of a case where the cargo T is loaded and unloaded on the lifting table Fe.

From the state of FIG. 17 (1), that is, the state in which the lifting table Fe is stopped flush with the loading table A, the slide table operation switch
When SW1 is connected to the "retraction" side, the slide base cylinder 3 contracts. During the contraction, the connecting member 4 at the tip thereof
Closes the limit switch LS3, the relay R3 is energized, and both the solenoids Sola and Solc are energized. Therefore, if the lifting switch SW2 is connected to the “down” side, both the electromagnetic switching valve 80 and the direction control valve 81 are switched to the right position, the high-pressure chamber of the lifting cylinder 16 communicates with the oil reservoir 78, The Fe lands together with the cargo T on the slide stand Ds by its own weight as shown in FIG. 17 (b), and the cargo T can be lowered from the solid line to the ground as shown by the chain line. In this case, the elevator Fe
Falls slowly.

Further, if the lift switch SW2 is turned off while the lift Fe is being lowered, the lift Fe can be stopped at an arbitrary position.

When the loading switch SW3 is switched to the "up" position after loading and unloading is completed, the relay R6 is energized and the normally open relay switch
The solenoid Solb is energized by turning on R6-1, and the lift Fe
Rises, and when this is flush with the load receiving surface of the loading platform A, the limit switch LS2 is turned on to the "level flush" side, and the lifting platform Fe stops at that position.

When the slide base operation switch SW1 is switched to the "extend" side, the solenoid Sole is excited as described above, and the slide base cylinder 3 can be extended.
The connecting member 4 at the tip of the slide base cylinder is connected to the slide base Ds by the tilting operation of 43, and the binding between the slide base Ds and the lift base Fe is released. If the slide base operation switch SW1 is switched to the “retraction” side, the slide base cylinder 3
Is contracted, and the slide table Ds can be stored on the loading table A. Thereafter, the lifting table Fe is raised and stored, and the cargo handling vehicle V can be brought into a running state.

In the above embodiment, the case of loading and unloading aircraft tires as cargo is described. However, it is needless to say that the present invention can be applied to the loading and unloading of other general cargo.

Further, in the above-described embodiment, the case where the cargo handling apparatus of the present invention is provided on the cargo handling vehicle has been described, but this may be provided on another thing.

In the above-mentioned lifting device, the lifting table is moved up and down along a substantially vertical guide column. Alternatively, another lifting device such as a link-type lifting device may be used.

Further, in the above-described embodiment, the case where the hydraulic cylinder is used as the reciprocating drive device of the slide table and the elevating table has been described, but it is needless to say that these drives may be performed by another drive device.

C. Effects of the Invention As described above, according to the present invention, in a cargo handling device capable of raising and lowering the lifting platform both above and below the loading platform,
When the loading platform and the lifting platform are not flush with each other, the sliding movement of the sliding platform is automatically regulated, so that the sliding movement of the sliding platform can be performed smoothly, safely and efficiently.

In addition, even if an instruction is input by the elevating switch to move the elevating platform to an arbitrary elevating position, the elevating operation of the elevating platform is regulated as long as the connecting member of the reciprocating drive device does not retreat to the standby position in the carrier. Even if the slide table on the lifting table rises and falls above and below the connecting member,
It is possible to efficiently and safely carry out the cargo handling work without damaging or damaging the connecting member, the connected portion on the slide table side, or the like, or disabling the lifting table.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a rear side view of a cargo handling vehicle equipped with a cargo handling device of the present invention, FIG. 2 is a plan view thereof, and FIG. FIG. 4 is a cross-sectional plan view taken along the line III-III of FIG. 4, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. 6 is a cross-sectional plan view taken along the line VV, FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is a partial plan view of a slide table showing an operation state of the connection release holding mechanism, FIG. 8 is an exploded perspective view of a slide platform and a loading platform of a cargo handling vehicle, FIG. 9 is an exploded perspective view of a lifting platform and a lifting mechanism, and FIG.
FIG. 11 is an exploded perspective view of a connecting device, a securing device, and a connection release holding mechanism. FIG. 11 is a hydraulic circuit diagram of a slide table cylinder and a lifting / lowering cylinder. FIG. FIG. 13, FIG. 13 is an electric circuit diagram of the present embodiment, FIG. 14 is a flowchart showing the operation of the present embodiment, and FIGS. 15 (1) to (4) are schematic diagrams of a cargo handling vehicle showing the operation of the present embodiment. 16 (1) and 16 (2) are schematic side views of the loading and unloading vehicle showing the loading process of the present embodiment, and FIGS. 17 (1) and (2) are the unloading processes of the present embodiment. It is a schematic side view of a cargo handling vehicle. A: loading platform, C1: lifting / lowering control means, C3: slide movement control means, Ds: sliding table, E: lifting / lowering mechanism, Fe ...
Lifting platform, LS2: Level position detecting means, LS4: Slide position detecting means 3: Reciprocating drive

Claims (1)

(57) [Claims] 1. A loading platform (A), a lifting platform (Fe) provided on one side of the loading platform (A) so as to be able to move up and down, and the lifting platform (Fe) is placed above and below the loading platform (A). An elevating mechanism (E) capable of driving up and down, and the elevating platform (F) provided on the loading platform (A).
e) A slide base (Ds) that can be transferred on the top and a connecting member (4) that can be detachably connected to the slide base (Ds) at its tip so that the slide base (Ds) can move forward and backward with respect to the lift base (Fe). Loading bed (A)
The reciprocating drive (3) connected to the slide table (Ds) when the loading platform (A) and the lifting platform (Fe) are flush with each other. Thus, in the cargo handling apparatus, the slide table (Ds) can be transferred to the loading table (A) and the lifting table (Fe), and the lifting table (Fe) is not flush with the loading table (A). A level position detecting means (LS2) which can be detected, a slide movement control means (C3) for restricting a sliding movement of the slide table (Ds) by a detection signal of the level position detecting means (LS2), and the reciprocating drive (3) ) Connecting member (4) is the carrier (A)
A standby position detecting means (LS3) for detecting that the vehicle is on standby, and an elevating switch (SW2) for inputting an instruction for elevating the elevating table (Ds) to an arbitrary elevating position. Elevation control means (C1) for restricting the elevating operation of the elevating table (Fe) unless the detection signal from the standby position detecting means (LS3) is received even in the instruction input state of the switch (SW2).
A safety device for a cargo handling device, comprising: