JP2643497B2 - Pallet fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a direction changing device for fixing a pallet on which a load is loaded in a state where the pallet is loaded with respect to a roller conveyor when a load is conveyed by a roller conveyor. Pallet fixing device.

[Conventional technology]

For example, in an ironworks, there is a work of subjecting a thin steel sheet sent from a rolling process to a surface treatment according to various uses, winding the coil into a coil shape, and packing and shipping the product. The product is placed on a pallet that is a skid made of wood or the like, bound with a steel band or a resin band, wrapped with wrapping paper, and packed with an iron protector to prevent deformation.

When loading a load such as a coil on a pallet, the pallet is placed at a predetermined position on a roller conveyor by input or by a pallet handling device such as a robot, and the load suspended by a lifting machine or the like is placed on the pallet. It is customary.

[Problems to be solved by the invention]

In the above-mentioned conventional work, there is a problem that a large number of hands are required for the packing work, safety is low, and work efficiency is low.

In recent years, plans for automation and unmanned operations in steelworks have been promoted, and a system in which a packing operation is divided into individual operations is being studied.

In order to pack and ship the coil, in the work part of placing the coil on the pallet, in the work to change the direction of the coil and align the coil and place it on the pallet,
In order to perform these operations with one device, the coil is mounted on a pallet on a roller conveyor by combining with a direction changing device of the coil and utilizing the rotational movement accompanying the coil direction change by the direction changing device of the coil. Although pallets are available in a variety of sizes and shapes, there are many types of pallets that are perforated with a frame only, covered with iron plate, and many types. When mounted on the pallet, there is a problem that it is difficult to match the contact portion between the coil and the pallet, particularly due to the ununiform height of the pallet, and there is a risk that the end of the coil may be deformed irregularly. In other words, by mounting the load on the pallet in a tilted position, if the load is partially deformed, or if the supporting force for the load is removed, the load may be tilted to a stable position due to its own weight. There are problems such as the occurrence of an impact or the displacement of the pallet on the roller conveyor, making it impossible to load the package at the center of the pallet.

It is also possible to know coil information and pallet information, control the amount of coil movement according to this information, and control the coil end to match the pallet surface. A drive system for controlling the position is required in the system, and precision is required, so that the mechanism must be precise, the detector, the control device of the actuator, etc. must be complicated and expensive. However, even if the apparatus itself is manufactured with high accuracy, there is a problem that the reliability of the obtained operation result is low because the manufacturing dimensional accuracy of the pallet is not sufficient.

In view of the above, the present invention has been made in order to solve the above-described problems in the related art, and it is a technical problem that the pallet is pinched and fixed at a fixed position on the roller conveyor surface of the direction changing device. It is an object of the present invention to achieve safe, accurate and automatic loading of a load on a pallet on a roller conveyor.

[Means for solving the problem]

Means of the present invention for achieving the above object is to fix a pallet on a roller conveyor of a direction change device for reversing the posture of a load such as a received coil by 90 ° by a rotating operation. A pallet fixing device, from the back side of the roller conveyor, protruding from the back side of the roller conveyor in the width direction, passing between the rollers of the roller conveyor, and sandwiching the pallet on the roller conveyor surface from the width direction, at least A pair of gripping claws; and a drive mechanism disposed on the back side of the roller conveyor and synchronously moving the two gripping claws in the opposite direction by the same distance in the width direction.

Also, in order to achieve more stable loading of luggage on the pallet, when one of the gripping claws is nipped with an empty pallet on the roller conveyor surface, the opposing one end of the pallet is A movable gripping claw that is lifted and supported from the conveyor surface, and the pallet lifted and supported by the movable gripping claw is pressed against the load by the load side to oppose the lifting force from the movable gripping claw, and the roller conveyor is moved. It is desirable to provide a detection body for detecting that the object has landed on the surface.

[Action]

When the empty pallet stops between the two gripping claws on the roller conveyor surface of the direction changing device, the drive mechanism of the pallet fixing device is operated, and the distance between the two gripping claws is reduced along the width direction. The pallets are moved by equal distances in the direction indicated by the arrow, and the pallets are centered and fixed on the roller conveyor surface by the movement of the two gripping claws.

Since the mounting position of the both gripping claws on the roller conveyor is located in advance with respect to the direction changing device along the conveying direction of the roller conveyor, when the pallet is centered by the two gripping claws, the pallet changes direction. Positioning with respect to the device has been accurately achieved.

From this state, the roller conveyor on which the pallets are fixed by the pallet fixing device is inverted at a desired angle, and is opposed to the main portion of the direction reversing device supporting the load. At this time, since the pallet has been positioned with respect to the direction change device, the load supported by the main portion of the direction change device and the pallet are aligned.

When the reversal of the roller conveyor is completed, the load supported by the main part of the turning device is advanced toward the pallet, and the load is brought into contact with the upper surface of the pallet, and the contact of the load with the upper surface of the pallet is achieved. Then, the main part of the direction change device and the roller conveyor are integrally returned and inverted, and the loading of the load on the pallet is achieved.

In this way, the pallet is positioned and fixed on the roller conveyor surface by the pallet fixing device, so that even if the roller conveyor is inverted, the pallet is displaced with respect to the load supported by the main portion of the direction change device. , And will be opposed to the luggage in a state where it is accurately positioned.

Also, since the actual placement of the load on the pallet is achieved by integrally returning the pallet and the load while keeping the load in contact with the pallet,
When placing the load on the pallet, there is no inconvenience that the load falls and rests on the pallet, or that an unreasonable load exerts an excessive force on the load.

The movable gripping pawl lifts and supports one end of the unloaded pallet from the roller conveyor surface, and the pallet floating on the roller conveyor surface bottoms on the roller conveyor surface due to the pressing force from the load side. In the case where is detected by the detection body, by obtaining a detection signal from this detection body, the load supported by the main part of the direction change device is pressed against the pallet with a sufficient pressing force, that is, Since it is possible to confirm that the contact state of the load on the pallet upper surface is proper, the placement of the load on the pallet is achieved more safely and satisfactorily.

〔Example〕

Hereinafter, an embodiment of the pallet fixing device according to the present invention,
This will be described with reference to the drawings.

In the illustrated embodiment, in the step of packing a coil C formed by winding a thin steel plate as a load, the direction changing device 30 that places the overlapping coil C on the pallet P with the posture of the overlapping coil C up-ended is provided. 1 shows an example in which a pallet fixing device 1 according to the invention is mounted.

FIG. 1 shows the front of the entire turning device 30 before turning, and the turning device 30 is supported horizontally by a rotating shaft 35 via a bracket 32 on a base block 31 that is immovably fixed. The reversing arm 34 extends obliquely downward from the base edge of the base body 33 whose base end is fixed to the rotation shaft 35.
Is extended, and a support arm 37 is fixed to the rotating shaft 35. The extension end of the reversing arm 34 is connected to a reversing drive source 36 supported at an immovable point. By the operation of the reversing drive source 36, the base body 33 is rotated and displaced about the rotation shaft 35 as an axis. A rotation drive source 38 attached to the lower surface of the base body 33 is connected to an end of the support arm 37 extending toward the shaft stop end to the rotation shaft 35. , The support arm 37 is rotated and displaced about the rotation shaft 35. The distal end portion of the base body 33 has a structure in which a mount 42 provided with a rod 43 for holding the coil C is detachably fixed and held, and the mount 42 which is fed by running on a rail 44 is Accept from 44 and firmly assemble and hold. Roller conveyor 40 on a pair of support arms 37
When the support arm 37 is turned upside down (the state shown in FIG. 1), the support arm 37 faces the coil C held on the base body 33 side via the gantry 42. 39 is the support arm 37
Is a support piece that is erected and fixed to a fixed portion so as to support the support arm 37 from below when it returns to the horizontal posture.

The pallet fixing device 1 includes a roller conveyor 40 supported on the support arm 37 of the direction changing device 30 by four support bases 2 fixed to the lower surface of the conveyor frame 41, which is a portion for attaching the roller conveyor 40 to the support arm 37. Attached to the back of the

A pair of guide bars 3 are fixed in parallel to the rollers of the roller conveyor 40 between the two sets of support bases 2 fixed to different conveyor frames 41 and facing each other. , A frame 4 is mounted in a bridging manner and slidably movable along the guide bar 3, one frame 4 has two gripping claws 5, and the other frame 4 has two movable grippers 5. The claws 12 are mounted in an upright manner in mutually facing postures.

Both frames 4 are approached synchronously along the guide bar 3,
The drive mechanism 19 for separating and moving includes a lever 23 which is rotatably mounted at a central portion by a shaft pin 25 via a seat 26 to a conveyor frame 41 of a roller conveyor 40, and one end of the lever 23 to one frame 4 And a combination of a connecting pin 20, an arm 21, and a connecting pin 22 for connecting the other end to the other frame 4, and an arm piece integrally provided in a central portion of a lever 23 so as to protrude laterally. 24, and a driving body 27 such as a cylinder attached to a fixed portion and having its output end connected to the extension end of the arm piece 24. , The two frames 4 connected to the lever 23 via the arm 21 are synchronously moved along the guide bar 3.

A gripping claw 5 attached to one frame 4 includes a mounting column 6 rising from the frame 4 and having an upper end protruding above the surface of the roller conveyor 40, and a mounting plate piece 7 fixed to the upper end of the mounting column 6. , Movable gripping claw of this mounting plate piece 7
And a claw piece 8 which is displaceably mounted on the 12 side via a guide shaft 9.
Mounting is achieved by slidably displacing the claw pieces 8 at the tips of four guide shafts 9 which are fixed to the mounting plate pieces 7 by the stoppers 10 so as not to come out.
The spring 11 is fitted in the. Therefore, normally, the claw 8 is in a posture parallel to the mounting plate 7, that is, in a posture in which the front surface is vertical due to the elasticity of each spring 11. The spring 11 is elastically deformed by the pressing, and tilts according to the surface shape of the pressed pallet P.

The movable gripping claw 12 attached to the other frame 4 is attached to the support column 13 erected and fixed to the frame 4 and to the support column 13 via a stop shaft 17 so as to be swingably displaceable in a vertical plane.
Swing arm 15 with its upper end protruding above roller conveyor 40
And a claw piece fixed to the gripping claw 5 at the upper end of the swing arm 15
14 and the lower end of the swinging piece 15 are integrally extended toward the gripping claw 5 side. When the swinging piece 15 swings the claw piece 14 away from the gripping claw 5, the roller conveyor 40 faces A pallet P on the roller conveyor 40 between the holding arm 16 protruding upward and a spring 18 for applying elastic force to position the mounting arm 16 below the surface of the roller conveyor 40;
When the pallet P is held, the swinging piece 15 is opposed to the elasticity of the spring 18 by the pressing force acting on the claw piece 14 from the pallet P,
The pallet on the roller conveyor 40 is displaced by swinging the claw piece 14 away from the gripping claw 5 and projecting the mounting arm 16 displaced integrally with the swinging piece 15 onto the surface of the roller conveyor 40. The other end of P is pushed up and floated from the roller conveyor 40 surface.

The detection body 28 for detecting the lifting of the pallet P from the surface of the roller conveyor 40 is attached to the support column 13 of the movable gripper 12.
The swinging piece 15 is mounted in a state where the swinging posture of the swinging piece 15 is detected. That is, the detector 28 using the limit switch
Is fixedly attached to 13 support columns immediately below the mounting arm 16 on the side of the stop shaft 17 so as to detect a certain amount or more of the displacement of the mounting arm 16 with respect to the detector 28. I have to.

When the pallet P is located at a fixed position on the roller conveyor 40 in the horizontal posture of the direction changing device 30 in which the gantry 42 in which the plurality of coils C are mounted on the rod 43 is attached and fixed to the tip of the base body 33, The driving body 27 of the pallet fixing device 1 in the standby posture shown in the drawing is operated to rotate the lever 23 clockwise about the shaft pin 25 in FIG. Due to the clockwise rotation of the lever 23, the two frames 4 connected to the end of the lever 23 via the arm 21 move closer and in synchronization with each other along the guide bar 3.

Due to the approaching movement of the two frames 4, the gripping claws 5 and the movable gripping claws 12 facing each other in the width direction move close to each other, and the claw pieces 8 and 14 are pressed against the side surface of the pallet P on the roller conveyor 40. The pallet P is held. The pallet P is positioned at the center in the width direction on the surface of the roller conveyor 40 by the gripping between the gripping claws 5 and the movable gripping claws 12. In addition, since the gripping claws 5 and the movable gripping claws 12 sandwich the pallet P, a reactive force acts on the claw pieces 14 of the movable gripping claws 12, so that the claw pieces 14 are fixed to the upper ends as shown in FIG. The swinging piece 15 swings counterclockwise about the stop shaft 17, and the swinging of the swinging piece 15 causes the device arm integrated with the swinging piece 15 to move.
16 lifts one end portion of the empty pallet P from the surface of the roller conveyor 40.

As described above, if the pallet P in an unloaded state is pinched and fixed on the surface of the roller conveyor 40 by the pallet fixing device 1 with one end portion of the pallet lifted, the rotation drive of the direction changing device 30 is performed. Activate the source 38 and roll the roller conveyor 40
As shown in FIG. 1, the pallet P, which is pinched and fixed, is rotated counterclockwise until the pallet P stands up against the coil C held by the gantry. In this state, the pallet P in the unloaded state is fixed in a state where it is positioned at a fixed position on the surface of the roller conveyor 40 by the pallet fixing device 1. It will face in the state where it was correctly located.

If the pallet P faces the coil C by the operation of the rotation drive source 38, the coil C held on the
43 together with the pallet P
Press the entire area of the lower surface of the roller onto the surface of the roller conveyor 40. That is, the mounting surface of the coil C is brought into contact with the pallet P surface.

Due to the displacement of the pallet P due to the pressing of the coil C, the rocking piece 15 is rocked and displaced in a clockwise direction integrally with the mounting arm 16, and the rocking displacement of the rocking piece 15 is detected by the detector 28. ,
Notifies that the pressing of the coil C to the pallet P has been achieved.

When the detection signal is output from the detection body 28, the reversing drive source 36 of the direction changing device 30 is operated, and as shown in FIG. 2, the base body 33 is clockwise and the roller conveyor 40 is horizontal. Up to the end of the roller conveyor 40.
39 Rotate until it touches the upper end. This turning device 30
As a result, the coil C held by the rod 43 of the gantry 42 is mounted on the pallet P by its own weight.

In the illustrated embodiment, at the same time as the transfer of the coil C from the gantry 42 to the pallet P, the attitude reversal of the superimposed coil C to the up-end can be achieved.

〔The invention's effect〕

The present invention has the above-described configuration, and has the following effects.

Since the empty pallets are fixed immovably while positioned on the roller conveyor surface, the positioning of the pallets with respect to the load carrying equipment is always accurately and stably achieved. It can be achieved accurately, smoothly and safely.

Since the fixing of the pallet on the roller conveyor surface is achieved by synchronous movement of both gripping claws along the width direction,
The pallet on the roller conveyor can be accurately positioned along the width direction at the same time as the fixing of the pallet, and no troublesome operation for positioning is required at all.

The pallet fixing device is arranged and fixed below the roller conveyor, and only the both gripping claws protrude from between the rolls onto the roller conveyor surface. The installation on the roller conveyor can be easily achieved without obstacles.

Since the mounting state of the coil on the pallet can be set before the direction change of the direction changing device, the mounting posture of the coil on the pallet can be stabilized.

Before the coil is inverted and mounted on the pallet, the mounting surface of the coil is brought into contact with the upper surface of the pallet, so that there is no shock due to transfer when the coil is mounted on the pallet.

Since the pallet and the coil are abutted against each other in a state where they are horizontally opposed, the coil can be mounted on the pallet in a stable standing posture regardless of the shape of the pallet.

Since the contact of the coil with the pallet is detected by the displacement of the pallet with respect to the roller conveyor,
The contact between the coil and the pallet can be reliably detected, whereby the operation control of the direction change device can be easily and accurately achieved.

Since the configurations of the drive system and the control system can be simplified, the direction change device can be manufactured at low cost and with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an overall front view of a direction changing device to which the device of the present invention is assembled when a roller conveyor is erected. FIG. 2 is an overall front view of the direction changing device shown in FIG. 1 when turning. FIG. 3 is a simplified plan view showing an example of an assembling configuration of the apparatus of the present invention on a roller conveyor. FIG. 4 is an overall plan view showing one embodiment of the device of the present invention. FIG. 5 is an overall front view showing a standby state of the embodiment of the apparatus of the present invention shown in FIG. FIG. 6 is an overall front view showing a state where the empty pallet of the embodiment of the apparatus of the present invention shown in FIG. 4 is fixed. FIG. 7 is an overall front view showing a completed state of the reverse mounting of the coil on the pallet in the embodiment of the apparatus of the present invention shown in FIG. DESCRIPTION OF SYMBOLS 1; pallet fixing device, 2; support base, 3; guide bar, 4; frame, 5; gripping claw, 6; mounting column, 7; mounting plate piece, 8; claw piece,
9; guide shaft, 10; stopper, 11; spring, 12; movable gripping claw, 13; support column, 14; claw piece, 15; rocking piece, 16; mounting arm,
17; stop shaft, 18; spring, 19; drive mechanism, 20; coupling pin,
21; arm, 22; connecting pin, 23; lever, 24; arm piece, 25; shaft pin, 26; seat, 27; driving body, 28; sensing body, 30; turning device, 31; base block, 32; Bracket, 33; base body, 34; reversing arm, 35; rotating shaft, 36; reversing drive source, 37; support arm, 38; rotating drive source, 39; support piece, 40; roller conveyor, 41; conveyor frame , 42; pedestal, 43; rod, C;
Coil, P; Pallet.

Claims (2)

(57) [Claims] 1. A direction change device (30) for reversing the posture of a load such as a coil (C) received by 90 ° by a rotation operation.
A pallet fixing device (1) for immovably positioning and holding a pallet (P) on a roller conveyor (40), wherein a roller of the roller conveyor (40) is provided from the back side of the roller conveyor (40). Roller conveyor through (40)
At least a pair of gripping claws (5) (12), which project in a width direction to face each other and hold the pallet (P) on the roller conveyor (40) surface in the width direction, and the roller conveyor (40). And the gripping claws (5) and (12)
And a drive mechanism (19) for synchronously moving in the opposite direction along the width direction by the same distance in the opposite direction. 2. A gripper on one side is fixed to a roller conveyor (40).
When an empty pallet (P) is nipped on the surface, one end side of the pallet (P) facing the pallet (P) is a movable gripping claw (12) that floats above the roller conveyor (40) and supports it. And a detector (28) for detecting that the pallet (P) lifted by the movable gripper (12) has landed on the surface of the roller conveyor (40).
A pallet fixing device in the direction changing device according to any one of the preceding claims.