JP3252315B2 - Cargo handling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for holding a material to be carried and moving it in a lifted state in order to carry, load or unload, for example, a cardboard box in which goods are packed. The present invention relates to a cargo handling device.

[0002]

2. Description of the Related Art In general, a heavy product packed in a cardboard box is transported in a factory by a belt conveyor. However, when loading or unloading at the end of the belt conveyor, manual labor becomes heavy labor,
A load is handled by a crane or an elevator, and a lifting device such as a crane for suspending and transporting the load, or a transport vehicle such as a forklift is used for transporting the load between a load accumulation location and a conveyor.

[0003] As a lifting device for carrying such a heavy load, a product packed in a cardboard box is tied and then hooked with a hanging metal fitting, a net is used for lifting, or an L-shaped section is used. There is a method that uses a mounting table, inserts it into the bottom of the box, lifts it on the table, or lifts the cardboard box by sucking the suction force of the suction cup by the suction force of the suction cup by remote control using the operator's hand switch. Have been.

[0004]

However, in the conventional lifting method as described above, if the cardboard is hooked by the hanging metal, there is a problem that the packing is damaged,
The hanging operation of the hanging tool and the slinging operation of the net are required, but this requires manual labor. In the method using a mounting table having an L-shaped cross section, the packing is not damaged, but unloading is performed by pulling out the table while pushing out the box, so that only manual labor is required. In addition, the space required for the box to be pushed out and the table to be pulled out is further required, so that the loading efficiency of the cardboard box is poor.

Further, it is difficult and time-consuming to suck the suction cup by remote control using a switch at hand, since the work is performed while the operator visually checks the suction cup. In addition, when lifting a load using a suction cup,
Lifting of heavy objects is difficult due to the limit of suction force.In addition, since the suction cup sucks and lifts the upper surface of the cardboard box, that is, the lid, the weight of the package is applied only to the lid and the lid is bent. In the worst case, the package may collapse from the lid, which is very dangerous.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cargo handling / transporting apparatus which can be easily operated without requiring special complicated operations for mounting and removing the cardboard boxes to be transported. Aim.

[0007]

According to a first aspect of the present invention, there is provided a cargo handling / transporting apparatus, comprising: a pair of plates sandwiching opposing side surfaces of a cardboard box from both sides; A link mechanism that supports the link mechanism so that it can be opened and closed and is constantly urged in the opening direction, a fluid pressure piston cylinder device that drives the link mechanism in the closing direction against the urging force, and the presence or absence of a load acting on the link mechanism An operating valve for supplying and discharging a fluid for opening and closing operation to the piston cylinder device in accordance with, a lifting device for lifting via the link mechanism in a state where a cardboard is sandwiched between the pair of plates,
It is provided with.

According to a second aspect of the present invention, there is provided a cargo handling / transporting apparatus according to the first aspect.
The link mechanism has a pantograph structure.

According to a third aspect of the present invention, in the cargo handling apparatus according to the first or second aspect, the means for urging the link mechanism in the opening direction includes the fluid pressure. It has a spring member provided between a piston rod of a piston cylinder device and an operating portion for opening and closing a link mechanism of the rod.

According to a fourth aspect of the present invention, in the cargo handling apparatus according to the first or second aspect, the means for urging the link mechanism in the opening direction includes the hydraulic pressure. A mechanism for introducing a reduced fluid pressure into a head side cylinder cavity of a piston cylinder device is provided.

According to the present invention, when a link mechanism for supporting a pair of plates is lifted in a state where a cardboard box is placed between the pair of plates so as to sandwich the side surface from both sides, the load is applied to the link mechanism. The fluid supply from the valve to the fluid pressure piston cylinder device is started, and the fluid pressure (pressing the piston from the piston rod side) drives the cylinder device to perform a closing direction operation on the link mechanism. It is. In conjunction with the operation of the link mechanism in the closing direction, the pair of plates approach each other in the closing direction and sandwich the cardboard box.

Further, the link mechanism of the present invention is configured to be constantly urged in the opening direction, the load action on the link mechanism is lost, the operation valve is switched, and the fluid to the hydraulic piston cylinder device is changed. When the supply stops and the driving of the link mechanism in the closing direction by the cylinder device stops, the urging force exceeds the fluid pressure, and the fluid pressing the piston of the cylinder device is discharged, while the link mechanism is conversely discharged. Is started in the opening direction. Along with this, the pair of plates also move away from each other in the opening direction to release the holding of the cardboard box.

As the link mechanism of the present invention, a link mechanism having, for example, a pantograph structure, the top of which can be lifted and lowered by a lifting mechanism (hoist) can be used. The pantograph structure is composed of a parallelogram four-link mechanism connected by a pair of surroundings, and a plate supported by each of two extended portions facing the top constitutes a pair of plates for sandwiching a cardboard box. Can be. Such a pair of plates approach each other in the closing direction as the pantograph structure elongates in the vertical direction, and move away from each other in the opening direction as the pantograph structure contracts in the vertical direction.

In the cargo handling and transporting apparatus using the pantograph structure for the link mechanism as described above, when a cardboard box is placed between a pair of plates and the link mechanism is lifted by a hoist, the pantograph begins to be displaced so as to extend vertically. At this time, the valve is operated by the load acting on the pantograph, the fluid such as air is supplied, the cylinder device is driven, and the closing operation is performed so as to extend the pantograph in the vertical direction. Along with this, the pair of plates approach each other in the closing direction, and the cardboard box between them is sandwiched by surface pressure and can be lifted as it is.

When the cardboard box is released from the sandwiched state, the cardboard box is lowered by the hoist to land. At this time, when the load disappears from the pantograph, thereby switching the valve operation and discharging air from the cylinder, the pantograph is contracted vertically by the urging force and folded, and the pair of plates are opened so as to move away from each other in opposite directions. The cardboard box is released from being pinched by the board.

The link mechanism of the present invention is not limited to the one using the pantograph structure as described above, and can support a pair of plates so as to be able to open and close, and can drive the pair of plates and open and close the pair of plates. What is necessary is just a thing which has a structure which can be linked.

As described above, according to the cargo handling / transporting apparatus of the present invention, the cardboard box is nipped and lifted by the simple operation of lifting the link mechanism while the cardboard box is placed between the pair of plates, and the cardboard box is lifted as it is. The pair of plates can be removed simply by lowering and landing the cardboard box at the target position and releasing the load.

The means for urging the link mechanism of the present invention in the opening direction includes a piston rod of a hydraulic piston-cylinder device and an operating portion for operating the rod mechanism to open and close the link mechanism. There is a method of providing a spring member. The link mechanism is constantly urged in the opening direction by this spring urging force, and when the fluid pressure obtained from the operation valve that has received a load action on the link mechanism overcomes this spring urging force and drives the cylinder device, The link mechanism operates in the closing direction, with which the pair of plates close to clamp the cardboard box.

When the load acting on the link mechanism is lost, the operation valve is switched, and the fluid supply to the hydraulic piston cylinder device is stopped, and the driving of the link mechanism in the closing direction by the cylinder device is stopped. The urging force exceeds the fluid pressure, and the fluid is discharged from the cylinder device, while driving the link mechanism in the opening direction starts.
Accordingly, the pair of plates are opened to release the cardboard box from being pinched.

As another means for urging the link mechanism of the present invention in the opening direction, there is a method including a mechanism for introducing a reduced fluid pressure into the head side cylinder cavity of the fluid pressure piston cylinder device. This is to supply the head-side cylinder cavity with the required reduced pressure when the load on the link mechanism is lost and the operation valve is switched to stop fluid supply to the hydraulic piston cylinder device. It is.

The fluid pressure introduced to the head side presses the piston from the head side, and discharges the fluid pressing the piston from the rod side. Thereby, the cylinder device drives the link mechanism to operate in the opening direction.

The operating valve of the present invention supplies the fluid for the opening operation to the piston cylinder device under the action of the load of the link mechanism. It is desirable that the pair of plates does not close due to the drive of the fluid pressure piston cylinder by its own weight alone.

However, when the above-mentioned means for urging the link mechanism in the opening direction is provided, for example, a spring member is provided between the piston rod of the cylinder device and the operating portion for opening and closing the link mechanism. Is provided,
By this spring biasing force, the fluid pressure corresponding to the weight action of the link mechanism can be countered to some extent. In the case where a mechanism for introducing a reduced fluid pressure into the head side cylinder cavity of the cylinder device is provided, the holding pressure reduced as much as necessary in advance to counteract the fluid pressure corresponding to the own weight action of the link mechanism is applied to the head. It may be introduced into the side cylinder cavity.

Further, in order to ensure that the link mechanism opposes its own weight, the action on the operation valve is controlled so that the fluid supply from the operation valve is started and the cylinder does not operate with a load about the same weight as the link mechanism. It is preferable to provide a means for performing this. For example, there is a method in which a transmission mechanism of a load action for actually driving an operation valve is provided with a spring mechanism having a spring force and a spring constant just against the own weight of the link mechanism.

Due to the compression resistance of the spring mechanism,
Even if it is lifted in an empty state, the load of the actual operation of the valve is not applied only by the weight of the link mechanism,
Since the supply of fluid from the valve is not started, the cylinder is not driven, and the closing of the pair of plates is avoided.

[0026]

Embodiments of the present invention will be described below. First, as a first embodiment of the present invention, a pantograph structure is used for a link mechanism, a spring member is used as a means for urging the link mechanism in a normally open direction, and a load transmission for driving an operation valve is further performed. A cargo handling / conveying device having a configuration in which a spring mechanism is provided in a portion will be described below. FIG. 1 shows a schematic configuration of the cargo handling and transporting apparatus.
(A) is a front view, (b) is a side view.

In the cargo handling / conveying apparatus shown in FIG. 1, a pair of pantographs having the same shape of a pantograph in which a four-link mechanism forms a rhombus, and two rhombic links in the horizontal direction of the rhombus are fixed between adjacent rhombic links. , Pantograph structure 2 configured such that each four-link mechanism operates in synchronization with each other
And a fluid-pressure piston-cylinder device 8 installed between the two rhombus-shaped horizontally opposed link portions of the pantograph structure 2.

The pantograph structure 2 is interlocked with the hydraulic piston cylinder device 8, and when the piston rod is pushed by the fluid pressure and moves deep inside the cylinder, the link portions at the horizontally opposed positions approach each other. (Preferably closed), the pantograph structure 2 extends vertically.
Also, when the piston rod comes out of the cylinder,
The link portions are operated in a direction away from each other (opening direction), and the pantograph structure 2 contracts vertically. Here, the spring member 9 is provided on the rod portion, and the pantograph structure 2 is constantly urged in the opening direction.

At the lower ends of the two sides of each of the pantograph structures 2 which face the respective diamond-shaped tops, plate members are respectively provided in series, which constitute a pair of plates 1 for sandwiching the cardboard box from the side surface. I have. The pair of plates 1 are linked to the opening and closing of the pantograph structure 2, approach each other in the closing direction as the pantograph structure 2 elongates vertically, and mutually approach as the pantograph structure 2 contracts in the vertical direction. Move away in the opening direction.

An operation valve 4 for supplying / discharging a fluid for opening / closing operation to / from the pantograph structure 2 to the fluid pressure piston cylinder device 8 is attached to a horizontal axis 10 between the tops of the pair of pantograph structures 2. The air supply / discharge is switched by pressing and releasing 5.

As shown in a partially enlarged view in the vicinity of the operation valve 4 in FIG. 2 ((a) is a front view and (b) is a rear view), pressing / release of a projection 5 for switching supply / discharge of the operation valve 4 is performed. Is
This is performed by moving the striker 7 up and down. The striker 7 is provided at a lower end of a vertical axis 11 that communicates with the lifting section 3 provided in a direction perpendicular to the horizontal axis 10. A portion of the vertical axis 11 below the horizontal axis 10 is inserted into the spring 6.

When the lifting section 3 is hooked and lifted upward by a hoist (not shown), the vertical axis 11 moves upward as shown in the front view (d) and the rear view in FIG. 2 (c). At the same time, a load is applied to the spring 6, and the spring 6 contracts relatively downward with respect to the longitudinal axis 11. At this time, the striker 7 at the lower end of the vertical axis 11 approaches the projection 5 of the operation valve 4 upward. When a load is applied to the pantograph structure 2, the spring 6 contracts greatly, and the striker 7 also moves (rises) greatly and presses the protrusion 5.

The pressing of the projection 5 of the striker 7 switches the supply / discharge of air to / from the cylinder device 8 of the operation valve 4. That is, the operation valves 4, the air flow path 13 from the piston rod-side cylinder cavity Y ₁ of the cylinder device to one, but also the other supply path for supplying air from the air pressure supply source (not shown) 12 When the protrusion 5 is pressed, the state is switched from the state shown in FIG. 3A to the state shown in FIG. 3C, and the air supply path 12 and the air flow path 13 are communicated. .

[0034] When the air introduced into the piston rod-side cylinder cavity Y ₁ through the operation valve 4 in the communicating state progresses, air pressure of the cylinder cavity Y ₁ presses the piston rod, as shown in FIG. 3 (d) Cylinder device 8
To shrink. Accordingly, the pantograph structure 2 extends vertically, the pair of plates 1 is closed, and the cardboard box between them can be sandwiched and lifted as it is.

In this case, since the cylinder device 8 is not driven by lifting in an unloaded state, the striker 7 moves the protrusion 5 of the operation valve 4 with the weight of the pantograph structure 2 by its own weight.
To prevent the spring 6 and the spring member 9
Are set in advance to appropriate spring forces and spring constants.

When the cardboard box is lowered and landed from the state of lifting by the hoist, and the load on the pantograph structure 2 is lost, the spring 6 is also extended, and the striker 7 is separated from the projection 5 and released from the pressed state. The valve 4 switches from the state of FIG. 3 (c) to the state of FIG. 3 (a) and cuts off the communication between the air flow path 13 and the air supply path 12.

[0037] At this time, the operation valve 4 side connection end of the air passage 13 is opened, air is discharged from the piston rod-side cylinder cavity Y _1. As the air is discharged, the air pressure pressing the piston rod becomes smaller, and the urging force of the spring member 9 becomes greater. Thereby, as shown in FIG. 3B, the cylinder device 8 is extended, the pantograph structure 2 is driven in the opening direction, that is, contracted in the vertical direction, the pair of plates 1 is opened, and the cardboard box is released from the sandwiched state. Is done.

According to the cargo handling / transporting apparatus having the above-described configuration, if a cardboard box is placed between the pair of plates 1 and lifted by the hoist from the lifting section 3 while being held by hand, the spring 6 is operated in response to the load. Contracts, and striker 7 becomes projection 5
, The operation valve 4 starts air supply to the rod-side cylinder cavity of the cylinder device 8, and the cylinder device 8 contracts, whereby the pantograph structure 2 is vertically extended and displaced, and the pair of plates 1 is closed to close the corrugated cardboard. The box can be clamped by surface pressure, and the cardboard box can be easily lifted without damaging the packing for mounting the cardboard box and without requiring a complicated operation.

Further, when the cardboard box is nipped and transported to a target position in a lifted state, the cardboard box is simply lowered by the hoist and landed, the spring 6 is extended by the disappearance of the load, and the striker 7 is moved from the protrusion 5. The air supply to the rod-side cylinder cavity of the cylinder device 8 of the operation valve 4 is switched to the discharge, and the urging force of the spring member 9 exceeds the air pressure with the discharge of the air, and the cylinder device 8 expands, so that the pantograph is expanded. Structure 2
Is contracted vertically, the pair of plates 1 is opened, and the cardboard box is released from the sandwiched state. As described above, the loading and unloading device shown as the first embodiment of the present invention can be easily operated without requiring a complicated operation for mounting and dismounting.

Next, as a second embodiment of the present invention,
As a means for urging the link mechanism in the opening direction by using a pantograph for the link mechanism, a mechanism for introducing reduced pressure fluid pressure into the head side cylinder cavity of the piston cylinder device instead of the spring member of the first embodiment. The loading and unloading device provided will be described below.

This second cargo handling and transporting device has the same configuration as the cargo handling and transporting device shown in FIG. 1 except for the means for urging the link mechanism in the opening direction, and includes a pantograph structure and an operation valve. A spring mechanism is also provided in the load transmitting unit for driving. FIGS. 4A and 4B show a schematic configuration of the cargo handling and transporting apparatus, wherein FIG. 4A is a front view, and FIG. 4B is a partial view of a piston cylinder device and an operation valve.

The cargo handling / transporting apparatus shown in FIG. 4 has a pantograph structure 22 composed of a pair of pantographs and a fluid pressure installed between a pair of rhombic horizontally-facing links of the pantograph structure 22 as in FIG. The pantograph structure 22 is linked with the cylinder device 28. When the piston rod is pushed by the fluid pressure and the cylinder device 28 contracts, the pantograph structure 22 is vertically extended and displaced. When the cylinder device 28 is extended, the pantograph structure 22 contracts vertically.

The plate members connected to the lower end of the pantograph structure 22 respectively constitute a pair of plates 21 for sandwiching the cardboard box from side to side.
Are linked to the opening and closing of the pantograph structure 22, approaching each other in the closing direction as the pantograph structure 22 extends vertically, and moving away from each other in the opening direction as the pantograph structure 22 contracts in the vertical direction.

In this cargo handling / transporting apparatus, as in the apparatus shown in FIG. 1, an operation valve 24 for supplying / discharging a fluid for opening / closing operation to / from the pantograph structure 22 to / from a hydraulic piston / cylinder apparatus 28 is also provided with a lifting / lowering part 23 When the striker 27 that moves up and down presses and releases the projection 25, the air supply / discharge operation is switched, and the up and down movement of the striker 27 is controlled to some extent by the spring force of the spring 26 that opposes the load. .

The operation valve 24 has, on one side, an air flow path 33 from the piston rod side cylinder cavity Y ₂ of the cylinder device 28 and an air flow path 34 from the head side cylinder cavity X ₂ , and the other side. Air supply paths 32 for supplying air from an air pressure supply source (not shown) are respectively connected.

When the protrusion 25 is pressed by the striker 27, the operation valve 24 is switched from the state shown in FIG. 4C to the state shown in FIG. The connection end of the head-side air flow path 34 is opened.

In this state, the rod side cylinder cavity Y
When the air supply to the ₂ progresses, air pressure of the cylinder cavity Y ₂ pushes the piston rod, to contract the cylinder device 28. Accordingly, the pantograph structure 22 extends vertically, the pair of plates 21 is closed, and the cardboard box between them can be sandwiched and lifted as it is.

Further, the cardboard box is lowered from the suspended state.
When the landing state is reached and the load on the pantograph structure 22 is lost, the spring 26 is also extended, and the striker 27 is separated from the projection 25 and released from the pressed state.
4 switches from the state shown in FIG. 4D to the state shown in FIG. 4C, disconnects the communication between the rod-side air flow path 33 and the air supply path 32, and changes the connection end of the rod-side air flow path 33. The head side air flow path 34 is opened and the air supply path 3
Communicate with 2.

At this time, the head side cylinder cavity X ₂
Air that has been appropriately depressurized by the pressure reducing valve 29 through the air flow path 34 is introduced to the piston rod, and the air pressure presses the piston rod from the head side, and from the piston rod side cylinder cavity Y ₂ through the air flow path 33. Air is exhausted. The cylinder device 28 is extended in accordance with the pressing of the piston rod from the head side, the pantograph structure 22 contracts in the vertical direction, the pair of plates 21 is opened, and the cardboard box is released from the sandwiched state.

Here, since the cylinder device 28 is not driven by lifting in an empty state, the spring 26
In addition to resistance to the self-weight action of pantograph structures 22 by the spring force of the advance, the head-side syringe cavity X ₂
Then, a holding pressure reduced as necessary to maintain the pantograph structure 22 open may be introduced.

According to the cargo handling / transporting apparatus having the above-described structure, if a cardboard box is placed between the pair of plates 21 and is lifted by the hoist from the lifting section 23 while being pressed by hand, the spring 26 can be operated in accordance with the load. Contracts and striker 27
Presses the projection 25 and the operation valve 24
Start the air supply 8 to the rod-side cylinder cavity Y ₂ of the pantograph structures 22 by the cylinder device 28 is contracted is extended displaced vertically, to sandwich the cardboard box at a surface pressure to close a pair of plate 21 Thus, the cardboard box can be easily picked up without damaging the packing for mounting the cardboard box and without requiring complicated operations.

Further, when the cardboard box is nipped and transported to a target position in a lifted state, the cardboard box is simply lowered by the hoist and landed. The spring 26 is extended due to the disappearance of the load, and the striker 27 is moved from the projection 25. air supply with switched to discharge into the rod-side cylinder cavity Y ₂ of the cylinder device 28 of the operating valve 24 away, suitably decompressed air supply starts to the head-side cylinder cavity X _2, fluid from the head side Cylinder device 2 with pressure of piston rod by pressure
8, the pantograph structure 22 contracts vertically, the pair of plates 21 open, and the cardboard box is released from the sandwiched state. As described above, the cargo handling / transporting apparatus shown as the second embodiment of the present invention can be easily operated without requiring complicated operations for mounting and dismounting.

FIG. 5 shows a cargo handling and transporting apparatus according to a third embodiment of the present invention. This device has a configuration in which a pantograph is used for the link mechanism and a spring member is used as a means for constantly urging the link mechanism in the opening direction, similarly to the device shown in FIG. 1. It has two pantograph structures so that two cardboards can be transported at a time.

That is, as schematically shown in the front view (a) and the side view (b) of FIG. 5, both ends of the horizontal shaft 50 orthogonal to the lifting portion 43 are provided with the first type of the same type as that of FIG. pantograph structures 42 _A and the second pantograph structure 42 _B are supported respectively, each pantograph structure (42 _A,
The lower end of the 42 _B), the first pair of plate 41 _A, a second pair of plate 41 _B are respectively provided continuously.

Further, each pantograph structure (42 _A , 4
2 _B), the first fluid each pressure piston Cylinders 4
8 _A, is provided with a second hydraulic piston cylinder device 48 _B, the rod portion of these Cylinders device, and the first spring member 49 _A and the second spring member 49 _B provided respectively, the The first and second pantograph structures (42
_A, 42 _B) is biased in a normally open direction.

In the present apparatus, one operating valve 44 is provided at the center of the horizontal axis 50 in the middle of both pantograph structures.
8 performs air supply and discharge of the _A and the second cylinder device 48 _B. The operation of the operation valve 44 is substantially the same as that of the device shown in the first embodiment, and the striker 47 that moves up and down with the lifting and lowering of the lifting portion 43
The air supply / discharge operation is switched by pressing / releasing 5, and the vertical movement of the striker 47 is controlled to some extent by the spring force of the spring 46 opposing the load.

[0057] The operation valve 44, while air passage 53 _A from the piston rod-side cylinder cavity of the first cylinder device 48 _A to the, air supplying air to the other from the air pressure supply source (not shown) The supply paths 52 are respectively connected. However, air passage 53 _A is branched at the cylinder apparatus, the branched air passage 53
_B is connected to the piston rod side cylinder cavity of the second cylinder device 48 _B.

When the protrusion 45 is pressed by the striker 47, the operation valve 44 is switched, and the air supply path 5 is switched.
2 and passed through the air passage 53 _A communicate with each other in the first cylinder device 48 _A. When air is supplied to the air passage 53 _A in this state, air is also supplied to the air passage 53 _B that are branched. Thereby, the first cylinder device 48
_A to the rod-side cylinder cavity and the second cylinder device 48 _B of the rod-side cylinder cavity air is introduced, the respective piston rod is pushed by the air pressure in the respective cylinder, the first cylinder device 48 _A and the 2 of the cylinder device 48 _B contracts, respectively.

Accordingly, the first pantograph structure 42 _A
And second pantograph structure 42 _B is extended vertically, the first pair of plate 41 _A and the second pair of plate 41 _B is closed cardboard boxes in between sandwiching respectively, in this state two cardboard boxes Can be lifted at the same time.

Further, both the cardboard boxes are lowered and landed from the suspended state, and the first and second pantograph structures (4
When 2 _A, 42 _B) load to the disappearance of the spring 46
There were extended, the striker 47 is released from the pressed state away from the projections 45, cut off the communication between the air passage 53 _A and the air supply passage 52 switched the operation valve 44.

[0061] At this time, the operation valves 4 of the air flow path 53 _A
4 side connection end is opened, air from the rod-side cylinder cavity of the first cylinder device 48 _A is discharged, also through the air flow path 53 _B from the rod-side cylinder cavity of the second cylinder 48 _B air is discharged from the air passage 53 _A. In each cylinder, the air pressure that has pressed the piston rod in accordance with the discharge of air decreases, and accordingly, the first spring member 49 _A and the second
Biasing force of the spring member 49 _B is superior.

Thus, the first cylinder device 48 _A
And the second cylinder device 48 _B is extended respectively,
First pantograph structures 42 _A and the second pantograph structure 42 _B will contract in the longitudinal direction, a first pair of plate 4
Both cardboard box open 1 _A and a second pair of plate 41 _B is released from the sandwiched state.

[0063] According to the cargo transfer apparatus of the above configuration, between the first and second pair of plate (41 _A, 41 _B) placed respectively cardboard boxes, hoist the lifting unit 43 while pressing by hand in Tsuriagere words, the spring 46 is contracted in response to the action of a load, operating the valve 44 the striker 47 presses the protrusion 45 is the first cylinder device 48 _a of the rod-side cylinder cavity and the second cylinder device 48 _B start the air supply to the rod-side cylinder cavity, first and second cylinder device (48 _a, 48 _B
) First and second pantograph structure (42 _A by the contract, 42 _B) is extended displaced vertically, the cardboard box is closed first and second pair of plate (41 _A, 41 _B), respectively Can be sandwiched by surface pressure, and the two cardboard boxes can be easily lifted simultaneously without damaging the packing for mounting the cardboard boxes and without requiring complicated operations.

Further, when the cardboard box is nipped and transported to a target position in a lifted state, the cardboard box is simply lowered by the hoist and landed. switches the air supply discharge operation valve 44 away, the first and second spring with the respective rod-side cylinder cavity of the first and second cylinder unit (48 _a, 48 _B) for the air is discharged member (49 _A, 49 _B)
Surpasses the urging force to the air pressure of the first and second pantograph structure by first and second cylinder device (48 _A, 48 _B) are extended respectively (42 _A, 42 _B)
Contracts vertically, and the first and second pair of plates (41 _A , 4
_1B ) is opened and both cardboard boxes are released from the pinched state.

As described above, in the cargo handling / transporting apparatus shown as the third embodiment of the present invention, a complicated operation is not required for mounting and dismounting, and a single transport of two cardboard boxes can be easily operated. be able to.

In this apparatus, the pantograph structure shown as the first embodiment is improved by combining two apparatuses using spring members for urging in the opening direction. The configuration shown in the second embodiment, that is, a configuration in which a mechanism for introducing a reduced air pressure necessary for urging the pantograph structure to open to the head side cylinder cavity may be combined. .

In the above-described configuration having two pantograph structures, the lower end of the pantograph structure is connected to each pair using a connecting member 55 as shown in FIG. It is desirable to secure them together on the same side on opposite sides of the board. This makes the lifting operation of the two cardboard boxes smoother. However, it is preferable that such a connecting portion is provided with a play so as to be somewhat free.

Further, in the cargo handling / transporting apparatus of the present invention, it is necessary that the cardboard box is immediately held after the lifting operation is started, so that the pair of plates is not too far from the side of the box when the cardboard box is installed. To some extent. For example, as shown in FIG. 5, there is a method in which a stopper means such as a spring 56 is provided between a pair of plates to suppress the initial opening of the pair of plates.

Also, as the weight of the cardboard box increases, it becomes more difficult to maintain the sandwiched state by the pair of plates. However, it is possible to more reliably hold the cardboard box and to sandwich and transport a heavier one. Therefore, means for improving the holding force may be provided on the pair of plates. For example, FIG.
As shown in (a), when the pair of plates are formed with the opening holes 60, the surface pressure increases and the holding force by the pair of plates increases accordingly.

When the contact surfaces of the pair of plates with the side surfaces of the cardboard box are smooth, it is needless to say that the cardboard boxes are relatively slippery. A method of forming irregularities may be used. In this case, the holding force by the pair of plates is improved by increasing the maximum static friction force. Of course, the unevenness of the contact surface
It does not damage the surface of the cardboard box.

[0071]

As described above, in the cargo handling / transporting device of the present invention, a pair of cardboard boxes are lifted by simply pressing the pair of plates against both sides of the cardboard box and lifting the link mechanism by hand. It can be transported in a lifted state by being sandwiched between plates, and after transport to the target position,
Simply release the link mechanism and land the cardboard box to release it from the pinched state.This eliminates the need to damage the packaging and eliminates the need for cumbersome mounting and dismounting operations. Carrying operation of cardboard boxes can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cargo handling and transporting device according to a first embodiment of the present invention, where (a) is a front view and (b) is a side view.

FIG. 2 is a partially enlarged view for explaining a switching operation for an operation valve 4 of the cargo handling device shown in FIG. 1;
The front view of (a) and the back view of (b) show the state before a load is applied to the link mechanism, and the front view of (c) and (d)
The back view of FIG. 3 shows a state after a load is applied to the link mechanism.

FIGS. 3A and 3B are explanatory diagrams for explaining an opening / closing operation of a fluid pressure piston cylinder device 8 by switching air supply / discharge of an operation valve 4, and FIG. 3A is a piping diagram and FIG. 4 shows the air supply state before the start of air supply or the air discharge state, and the piping diagram of FIG. 4C and the schematic diagram of the entire apparatus of FIG.

FIG. 4 is an explanatory view of a cargo handling / transporting device according to a second embodiment of the present invention, where (a) is a schematic front view of the upper portion of the device,
(B) is a side view of the fluid pressure cylinder device portion, (c) is a piping diagram showing a state before air supply to the cylinder device by the operation valve is started or air is discharged, and (d) is air supply to the cylinder device by the operation valve. It is a piping diagram showing a state.

FIG. 5 is a schematic configuration diagram of a cargo handling / transporting device according to a third embodiment of the present invention, where (a) is a front view and (b) is a side view.

[Explanation of symbols]

1, 21, 41 _A, 41 _B: a pair of plate 2,22,42 _A, 42 _B: pantograph structures 3,23,42: lifting unit 4,24,44: Operation Valve 5,25,45: projections 6, 26, 46: spring 7,27,47: striker 8, 28, 48 _A, 48 _B: hydraulic piston cylinder device 9,49 _A, 49 _B: spring member 10, 30, 50: horizontal axis 12, 32, 52 : air supply passage 13,33,53 _A, 53 _B: air flow path (piston rod side) 34: air flow passage (head side) X _1, X _2: the piston rod-side cylinder cavity Y _1, Y _2: the head side Cylinder cavity 55: Connecting member 56: (Between a pair of plates) Spring 60: Opening hole

Claims (4)

(57) [Claims] 1. A pair of plates sandwiching opposing side surfaces of a cardboard box from both sides, a link mechanism supporting the pair of plates so as to be able to open and close, and constantly urged in an opening direction, and the link mechanism is provided with A fluid-pressure piston-cylinder device driven in the closing direction against a force, an operation valve for supplying / discharging fluid for opening / closing operation to / from the piston-cylinder device according to the presence or absence of a load acting on the link mechanism; And a lifting device that lifts through the link mechanism in a state of being sandwiched between the pair of plates. 2. The cargo handling device according to claim 1, wherein the link mechanism has a pantograph structure. 3. A means for urging the link mechanism in the opening direction is provided between a piston rod of the hydraulic piston cylinder device and an operating portion for opening and closing the link mechanism of the rod. The cargo handling and transporting device according to claim 1 or 2, wherein the cargo handling and transporting device has a spring member provided. 4. A mechanism for urging the link mechanism in the opening direction, comprising a mechanism for introducing a reduced fluid pressure into a head side cylinder cavity of the fluid pressure piston cylinder device. The cargo handling / transporting device according to claim 2.