JPH08141838A - Automatic deburring device for plastic pallet - Google Patents

Abstract

PURPOSE: To enable the removal of deposition burrs at the outer periphery including the curved face and bent face of a plastic pallet and at a fork entry by holding a machining head, provided with an expandable cutter between a pair of guide rollers traveling on the machined surface, rotatably to the intermediate part of a corrugated link. CONSTITUTION: When a machining device 5a moves forward, a machining head 12 comes to a curved part, and a corrugated link 10 is rotated in the direction of approaching the machined face by an elastic body 9. The rotating force of the corrugated link 10 is imparted to the machining head 12 through a bonded part 16, and the machining head 12 is rotated around a backward side guide roller 14b as a fulcrum so that a forward side guide roller 14a comes in contact with the curved surface. This action is continuously generated in association with the rectilinear motion of a machining device 5a, and the copying of the curved part at the end of a horizontal part is completed. At the same time, burrs at the curved part is removed by a cutter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention In the process of manufacturing a plastic pallet, the present invention automatically welds two skits to automatically generate burrs on the outer periphery of the pallet including a curved portion and a bent portion and a fork insertion port. The present invention relates to an automatic deburring device for a plastic pallet to be removed.

[0002]

2. Description of the Related Art Since a plastic pallet is provided with an insertion port for carrying a forklift, as shown in FIG. 5, it is generally formed into a semi-finished product (skit) which is divided into upper and lower parts. The pallet body is formed by welding the upper and lower skits. At this time, the excess volume of the melted and rolled down portion is extruded to the outer periphery of the pallet and the side wall of the fork insertion port to form a burr, which must be removed for aesthetic reasons and other reasons.

Conventionally, in this work, the four corners of the pallet and the artificial portion of the fork insertion port are curved or bent, and it is thought that automatic removal is difficult. The work posture is unreasonable, and the occurrence of injuries such as backache and the time consuming have hindered the improvement of productivity.

As an example of automation technology, Japanese Patent Publication No. 6-4
The technique disclosed in Japanese Patent Publication No. 9250 is cited. The technique is based on a gantry that is configured to be parallel to a machining surface, a link that is pivotally attached to a machining device on the gantry and that can be separated and indirect, a first air cylinder device that rotates the link, and A machining head pivotally attached to the tip and a second air cylinder device for rotating the head with respect to the link are provided. The machining head has a flat blade in contact with the surface to be machined and the flat blade to be machined. It is equipped with a guide roller that follows the surface. When the processing device travels, the processing head is rotated by the reaction force given from the plastic pallet via the pivot, the second air cylinder device is pushed back by the rotating force, and the first head is further moved by the pivot and the link. By pushing back the air cylinder device, a pressing force is applied to the surface to be processed, and burrs are removed while following the surface.

[0005]

[Problems to be Solved by the Invention] As a trend of plastic pallets, it is considered that the thickness dimension will be reduced in the near future.
As a result, the size of the fork slot is naturally reduced,
Since the above-mentioned technique uses a plurality of air cylinders, it is difficult to make the structure compact to cope with this trend.
In addition, since the processing head is equipped with the blade edge of the flat blade and the guide roller for copying in front of it, when considering deburring of a curved portion or a bent portion having a small radius of curvature as shown in FIG. A gap (h2> h1) is created on the surface to be machined, uniform deburring is not performed, and the cutting edge rises with respect to the surface to be machined (θ2> θ1), the cutting resistance fluctuates greatly, and the cause of the cutting edge of the blade is Become.

As for the discharge of the cutting waste after deburring, a vibration device, a reversing device, etc. are currently used in the next process.
Alternatively, the cutting waste is manually discharged, which is a problem in terms of cost, but the above-mentioned conventional technique cannot reduce the number of steps.

It is an object of the present invention to remove welding burrs on the outer periphery of a plastic pallet including curved and bent surfaces and the fork insertion port, and to quickly collect and discharge the cutting wastes generated thereby, and to automatically eject the plastic pallet. To provide a taker.

[0008]

To achieve the above object, an automatic burr device for a plastic pallet according to the present invention is a plastic pallet having a plurality of fork insertion openings formed by melting and crimping two skits. A curved part, and an automatic deburring device for removing a welding burr on an outer peripheral surface including a bending surface part, which is provided with a single or a plurality of processing devices capable of linear movement on a gantry installed on a parallel line of a surface to be processed, In the processing device, a processing head having a pair of guide rollers running on a surface to be processed and a retractable blade between the guide rollers is rotatably held in the center of the corrugated link, and the link is at one end. Is rotatably attached to the body frame and is stretched by an elastic body, and the other end is fixed to the tip of the cylinder via another link.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the overall structure will be described with reference to FIG. A pedestal 4 supported by a guide 3 is installed on a parallel line of a work surface A of a plastic pallet P that is fixed in advance on the support pedestal 1 by a positioning device 2. Two sets of processing devices 5a for processing the end face and two processing devices 5b for processing the fork insertion holes are provided on the pedestal 4, and the driving device 6 is formed so as to go straight along the guide 3 via the pedestal 4. . The fork slot processing device 5b has a configuration in which the end surface processing devices 5a are arranged in two rows so that their back surfaces are aligned.

Next, the detailed configuration of the processing devices 5a and 5b will be described with reference to FIG. A corrugated link 10, one end of which is pivotally attached to a frame 7 by a pivot shaft 8, is supported by an elastic body 9 in the processing devices 5a and 5b, and the corrugated link can be separated and indirectly connected to a surface A to be processed. . The corrugated link 10 is provided with a balance weight 24 at a position symmetrical with respect to the pivot shaft 8, and the elastic body 1 is connected to the middle portion by the pivot portion 16.
The machining head 12 is held at 1, and the other end is pivotally attached to another link 18 by a connecting pin 17. The link 18 is movably pivotally attached by a connecting pin 19 to a long hole portion of a guide link 21 having a long hole at the center. A cylinder device 22 for moving the guide link 21 parallel to the surface A to be processed is provided at an end of the guide link 21 via a connecting pin 20. Further, a pipe 23 having a suction port near the processing head 12 is located along the frame 7.

Next, referring to FIG. 4A, the processing head 12
The configuration of will be described. The processing head 12 is connected to the corrugated link 10 via a pivotally attached portion 16, and is held in an attitude by an elastic body 11. The processing head 12 is provided with a pair of guide rollers 14a and 14b.
A curved blade 13 is provided between the two. The curved blade 13 is attached to the surface A to be processed by an elastic body 15 so as to be separated and indirect. Further, as shown in FIG. 4B, the curved blade 13 has a plate member 26 having a curved shape mounted on a metal fitting 25 for mounting on the processing head 12, and the central portion of the plate member 26 is cut out, The cutting edge 28 is formed at a position located at the apex of the curved line of the cutout portion 27.

An operation example of the present invention will be described below with reference to FIGS.

When the end face processing device 5a and the fork insertion hole processing device 5b on the gantry 4 installed in parallel with the surface A to be processed of the plastic pallet P which is fixed and positioned in advance move straight by the drive device 6, On the surface B which is perpendicular to the surface A, the processing head 12 held by the elastic bodies 9 and 11 on the processing devices 5a and 5b is held by the guide roller 14
It contacts via a and 14b. Further processing devices 5a, 5b
By moving straight, the processing head 12 is given a reaction force from the plastic pallet P via the guide rollers 14a and 14b, and pushes up the wave-shaped link 10 via the pivotally connecting portion 16 to move the corrugated link 10 to the surface to be processed. Although it tries to rotate in a direction away from A, due to the elastic force of the elastic body 9,
The machining head 12 has the forward guide roller 14a as a fulcrum and the forward guide roller 14a has a curved surface R via the pivot portion 16.
It rotates until it comes into contact with 1, and comes into contact with and is pressed against the surface A to be processed. Actually, the operation is continuously performed by the continuous straight movement of the processing devices 5a, 5b, and the guide rollers 14a, 1
4b runs on the curved surface R1 while being pressed against the curved surface R1 by a certain force and cutting the burr. During the operation, as shown in FIG. 3, a close battle between the pair of guide rollers 14a and 14b,
A height difference H is generated at the apex of the curved surface R1 between the guide rollers 14a and 14b, but in the present invention, the height difference H is absorbed by the elastic body 15 which holds the curved blade 13, and the height difference H of the elastic body 15 is absorbed. Since the cutting edge 28 of the curved cutting tool 13 is pressed against the curved surface R1 by the stretching force without standing as shown by θ2 in FIG. 6, it is possible to remove the burr uniformly and without imposing an excessive load on the cutting edge 28. .

Further, when the processing devices 5a and 5b run,
The processing head 12 is pressed against the horizontal surface A to be processed by the elastic body 9 via the corrugated link 10, and is also pressed against the surface A to be processed by the elastic body 15 between the two guide rollers 14a and 14b. The curved blade 13 is the processing device 5
Burrs are removed while traveling in the traveling directions of a and 5b.

When the processing devices 5a and 5b further advance, the processing head 12 bends the curved portion R2 (symmetrical to the above-mentioned curved portion).
Then, the corrugated link 10 is rotated by the elastic body 9 in the direction of approaching the surface A to be machined, and the turning force of the corrugated link 10 is applied to the machining head 12 via the pivot portion 16.
The processing head 12 rotates about the backward guide roller 14b as a fulcrum so that the forward guide roller 14a contacts the curved surface R2. This operation is similar to the above-mentioned operation, that is, the processing devices 5a, 5
It continuously occurs as b goes straight, and the curved portion copying at the end of the horizontal portion is completed here, and at the same time, the burr of the portion is removed. After that, as the processing devices 5a and 5b further advance, the above-described operation is repeated, and the deburring work of all the work surfaces A and the curved surfaces R1 and R2 parallel to the traveling direction of the processing devices 5a and 5b is completed. It will be. During the above-mentioned all operations, the burr removed by the pipe 23 having the suction port always near the curved blade 13 is sucked at any time and collected near the other port of the pipe 23.

After that, the processing devices 5a, 5b retreat to the position of the gantry 4 in the direction opposite to the traveling direction, but during this operation, the corrugated link 10 is opened by the elastic body 9 in the direction of the surface A to be processed. Therefore, it is difficult for the drive device 6 to retract the processing devices 5a and 5b in the deburring completed state C shown in FIG. By the way, although one end of the corrugated link 10 is rotatably fixed to the processing devices 5a and 5b, the other end is connected to another link 18, and the other end of the link 18 is connected to the processing devices 5a and 5b. Cylinder device 2 in forward and backward directions
2 is connected to a movable guide link 21 via a connecting pin 20. During the deburring operation, the rod of the cylinder device 22 is in a projecting state, and one end of the link 18 is in a state of being freely movable in the elongated hole via the connecting pin 19, so that the link according to the movement of the corrugated link 10 1
8 follows and enables the above-described deburring action, but when the machining devices 5a and 5b move backward, the rod of the cylinder device 22 is housed, and the guide link 21 via the connecting pin 19 causes the link 18 to move. To pull the corrugated link 10 connected to the other end of the link 18 from the elastic body 9
Can be retracted by rotating in a direction away from the surface A to be processed while extending. In this state, the drive device 6 is caused to act in a retractable direction, and the processing device 5
a and 5b retreat and enter a state as shown in FIG.

Next, deburring of the work surface B perpendicular to the traveling direction of the processing devices 5a and 5b is carried out. In this case, the plastic support pallet P supporting the plastic pallet P is provided and the plastic is removed. A rotary table (not shown) located below the pallet P is lifted, the plastic pallet P is lifted and rotated by 90 degrees (Deg), and then the plastic pallet P is lowered onto the support 1. It is fixed again by the positioning device 2 and the above-mentioned deburring action and retreating action are repeated again, and thereby all the burrs generated on the outer periphery of the plastic pallet P including the curved part and the bent part and the fork insertion side wall are removed. It has been done. The elastic bodies 9, 11 and 15 in the text may be springs, rubber or cylinders, and the drive device 6 may be a ball screw, a friction wheel, a cylinder or the like. In addition, the guide rollers 14a and 14b in the text are not rollers but may be plates of that shape. Further, the mutual distance between the end surface processing device 5a and the fork insertion hole processing device 5b can be of course adjusted.

Further, by mounting the balance weight 24 at a position symmetrical with respect to the pivot portion 8 of the corrugated link 10 in the sentence, not only the influence of the self-weight of the corrugated link 10 is avoided and the copying property is improved, but, for example, machining is performed. It is also possible to arrange the devices 5a, 5b vertically or vertically.

[0019]

According to the automatic deburring device for a plastic pallet according to the present invention, burrs are uniformly removed by a curved blade and a guide roller regardless of a horizontal surface, a curved surface or a bent surface, and the blade is damaged. Troubles are reduced. It can also be used for narrower fork insertion holes than before. Moreover, since the burr removed by the suction pipe is collected at any time, it is not necessary to collect the burr in the next step, which leads to a reduction in equipment cost.

[Brief description of drawings]

FIG. 1 shows the overall configuration of an automatic deburring device according to the present invention.

FIG. 2 shows a usage state of a horizontal portion of the automatic deburring device according to the present invention.

FIG. 3 shows a usage state in a curved portion (bent portion) by the automatic deburring device of the present invention.

FIG. 4A is a sectional view of a processing head, and FIG.
The block diagram of a curved blade is shown.

FIG. 5 shows a method of manufacturing a plastic pallet.

FIG. 6 shows an example of the above-mentioned problems with the conventional technique.

[Explanation of symbols]

1 Support base 2 Positioning device 3
Guide 4 Stand 5a, 5b Processing device 6
Drive device 7 Frame 8 Pivot part 9
Elastic body 10 Corrugated link 11 Elastic body 12
Processing head 13 Curved blades 14a, 14b Guide roller 15
Elastic body 16 Pivoting part 17 Connecting pin 18
Link 19 Connecting pin 20 Connecting pin 21
Guide link 22 Cylinder device 23 Tube 24
Balance weight 25 Bracket 26 Plate material 27
Notch 28 Edge

Claims (4)

[Claims] 1. An automatic deburring device for removing welding burrs on a curved portion of a plastic pallet having a plurality of fork insertion openings formed by melting and crimping two skits and an outer peripheral surface including a bending surface portion. And a pedestal installed on a parallel line of the surface to be processed is provided with a single or a plurality of processing devices capable of linear movement, and the processing device includes a pair of guide rollers traveling on the surface to be processed, and a space between the guide rollers. A processing head having a retractable blade is rotatably held in the center of the corrugated link, one end of which is rotatably attached to the body frame and which is stretched by an elastic body and the other end of which is a separate link. An automatic deburring device for plastic pallets, characterized by being fixed to the tip of the cylinder via. 2. A processing head comprising a curved cutting tool having a cutting edge at the top of a curved metal plate extensible and held by an elastic body, and guide rollers before and after the curved cutting tool. Automatic deburring device for No. 1 Phustic Pallet. 3. A plastic pallet according to claim 1, wherein a balance weight is provided at a position symmetrical to the pivot portion of the corrugated link according to claim 1 to suppress the force of the link's own weight exerted on the elastic body to improve the copying property. Automatic deburring device. 4. The automatic burr of a plastic pallet according to claim 1, wherein a pipe having a suction port is provided near the curved cutting tool according to claim 2, and the cutting scraps cut by the curved cutting tool are sucked and discharged at any time. Taker.