KR880000245B1 - Pallet changing device - Google Patents

Abstract

The pallet exchanger has a tool exchange arm formed with tool holder on both ends. An arm support has an arm driving mechanism for rotating the tool exchange arm and reciprocating it toward and away from a shaft provided for the arm support. A carriage swingably supports the arm support about the shaft. The carriage moves between the tool magazine and spindle along guide rails. An arm swinging drive has a pin on a back surface of the arm support. An oil pressure cylinder is mounted on the tool magazine and including a position rod, and hook mounted on an outer end of the piston rod for removably engaging the pin.

Description

Pallet Changer

1 is a cross-sectional view taken along line I-I of FIG. 3 showing a drive mechanism of a pellet exchange device according to the present invention.

2 is a side view of a pellet exchange device according to the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2;

* Explanation of symbols for main parts of the drawings

10: pallet exchanger 11: pallet mounting table

13: guide rail 15: slide bar

17 hook 18, 18a hook

22, 23: chain 24: sprocket

25: hydraulic cylinder 25a: piston rod

P: pallet

The present invention relates to a pallet exchange device for sequentially exchanging pallets with respect to a workbench of a machine tool.

In machining centers and the like, in order to prevent a decrease in the operation rate of the machine tool due to the preparation work of the machine, a pallet exchange device that sequentially exchanges pallets with respect to the machining table of the machine tool is used.

The pallet exchanger installs a pair of hydraulic cylinders in parallel, and simultaneously slides a slide bar with a hook that is hooked to the pallet by the hydraulic cylinders in the horizontal direction at the same time along the guideway installed on the pallet mounting table. It is known that the pallet is guided and pulled simultaneously to the pallet station in the pallet magazine and the machining table of the machine tool.

In such a conventional pallet exchanger, a pair of hydraulic cylinders are installed in parallel so that their extending directions are opposite to each other. When the pallet is enlarged and the moving distance of the slide bar is increased, the hydraulic cylinder stroke is also long. There is a problem that the size of the whole pallet exchanger increases, and the pallet exchange time becomes long.

The present invention has been made in view of this point, and an object of the present invention is to provide a pallet exchange apparatus which is compact and has a short pallet exchange time.

The present invention is a pallet exchange device for exchanging pallets between a factory machine table and a pallet station, a support table installed on the floor, and supported on the support table so as to be able to rotate 180 ° in a horizontal plane, and on top of each other. A pallet mounting table provided with a pair of parallel guideways, a pair of slide bars fitted with hooks to engage the pallet at the tip, and sliding in opposite directions along the guideways, and the pallet A linear engagement portion provided on the upper surface of the float mounting table and the lower surface of the pair of slide bars, and between the pallet mounting table and the pair of slide bars, the pallet mounting table and the pair of slide bars. Gears that engage at the same linear engagement portions respectively provided on the gears and the pallet mounting table, It is characterized by having an actuator for reciprocating linear movement of the rake in the sliding direction of the slide bar.

According to the present invention, the slide bar can move at twice the speed of the reciprocating linear movement speed of the cog wheel, and can move the distance twice the reciprocating linear movement distance of the cog wheel. As a result, the pallet can shorten the replacement time, and a small stroke actuator can be used, so that the pellet exchanger can be miniaturized.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

In the drawing, reference numeral 11 denotes a pallet mounting table of the pallet exchanger 10, and the table 11 can be rotated 180 ° in a horizontal plane about the central axis on a support 12 installed vertically on the floor surface. It is installed to As this large turning mechanism, for example, a known mechanism such as a combination mechanism of a pinion and a gear or a combination mechanism of a rack and a pinion reciprocally driven by a hydraulic cylinder can be used.

In the upper part of the table 11, the guide slides which a pallet slides, for example, are provided in parallel with several guide rails 13 (for example, two) at predetermined intervals. On the upper surface of the guide rail 13, a plurality of rollers 14 are arranged in a straight line to facilitate the movement of the pallet. Moreover, the pair of slide bars 15 which slide and move in opposite directions along with the guide rail 13 are provided in the side position of the guide rail 13.

At the front end of the slide bar 15, hooks 18 are engaged with the hook portions 17 provided at the ends of the pallets P, respectively. This hook 18 is slidably attached to the slide bar 15 via the pin 19 and is normally pulled downward by the spring 21.

On the lower surface of the pair of slide bars 15 and the upper surface of the table 11 opposite the lower surface of the slide bar 15, linear engagement portions, for example, chains 22 and 23, are pulled in a straight line, respectively. Attached. The chain 23 pulled and attached to the upper surface of this table 11 is provided over the range which the gearwheel mentioned later can engage and engage, when the slide bar 15 reciprocates between a retracted position and an advanced position. Between the pair of slide bars 15 and the table 11, a gear, for example, a sprocket 24 engaged at the same time up and down at each straight engagement portion, is engaged with the respective chains 22 and 23 at the same time. It is installed. The sprocket 24 is provided between the slide bar 15 and the table 11 of the piston rod 25a of the pair of hydraulic cylinders 25 installed in parallel with the guide rail 13 and in opposite directions. It is rotatably attached to the tip.

Next, the operation of the present embodiment having such a configuration will be described.

First, as shown in FIG. 1, the hook 18 attached to the end of the slide bar 15 is moved forward from the position (standby position) which has been moved back to the near center of the table 11, and thus the processing table and An operation of hanging the pallet P on the pallet station and dragging it onto the table 11 will be described. When each of the hydraulic cylinders 25 is operated to extend the piston rod 25a, the sprocket 24 is pushed and rotates to move forward. In this case, the sprocket 24 is engaged with the chains 22 and 23 at the same time, but since the table 11 to which the chain 23 is attached is fixed, the slide bar 15 to which the chain 22 is attached is sprocket ( Move in the same direction as 24).

The movement speed of the slide bar 15 is twice the movement speed of the sprocket 24 (expansion speed of the piston rod 25a of the hydraulic cylinder 25). Therefore, when the piston rod 25a extends the distance of L at the speed V, the slide bar 15 advances the distance of 2L at the speed of 2V.

When the hook 18 is moved to the shear position (shown by reference numeral 18a in FIG. 1), the hook 18a is engaged with the hook portion 17 of the pallet P on the working table and the pallet magazine. Lose. This engagement is caused by the contact of the respective tapered surfaces formed at the ends of the hook 18a and the hook portion 17 so that the hook 18a swings upward against the tension force of the spring 21 and again the hook portion 17. This is done by immersing in the urine.

Next, when the hydraulic cylinder 25 is operated in the opposite direction and the piston rod 25a is pulled in, the pallet P is attracted to the hook 18 so that the pallet exchanger 10 can be pulled from the worktable and the pallet station side. ) Is carried on the guide rail (13). Also in this case, the pallet P is conveyed at the speed twice the pulling speed of the piston rod 25a.

In this way, when the slide bar 15 is moved back to the rear end position, the two pallets P are completely transferred onto the table 11 of the pallet exchanger 10 as shown in FIG. You are in a lost state.

In this state, the table 11 is rotated 180 degrees so that the pallet P on the machining table side is directed to the pallet station and the pallet P on the pallet station side is directed to the machining table side. Then, the hydraulic cylinder 25 is operated to extend the piston rod 25a to move the slide bar 15 forward.

The pallet P, which is placed on the guide rail 13, is pushed by the hook 18 and moved, and is carried on the worktable and the pallet station, respectively. The working table and the pallet station on which the pallet P is moved are moved down a predetermined distance, whereby the engagement between the hook 18a0 and the hook 17 is removed.

Thereafter, the piston rod 25a of the hydraulic cylinder 25 is pulled in, the slide bar 15 and the hook 18 move backward, and return to the above-mentioned standby position again.

In this way, according to this embodiment, the slide bar 15 and the hook 18 can be moved at a speed twice the expansion speed of the piston rod 25a of the hydraulic cylinder 25 to shorten the conveying time of the pallet. Can be.

In addition, since the hook 18 moves twice the distance of the expansion and contraction distance of the piston rod 25a of the hydraulic cylinder 25, the stroke of the hydraulic cylinder is compared with the structure in which the hook is directly connected to the hydraulic cylinder as in the prior art. Can be made small.

In addition, in this embodiment, between the slide bar 15 and the table 11, the example which attached the chain 22 and 23 as the sprocket 24 and the linear engagement part which meshes with this as a gearwheel is shown. Although shown in the figure, a pinion may be used instead of the sprocket 24, and a rack engaged with the pinion may be firmly attached to the chains 22 and 23 instead.

As described above, according to the present invention, a double conveying stroke can be obtained with respect to the stroke of the hydraulic cylinder, and the lengthwise direction of the hydraulic cylinder can be shortened, and the pallet changing apparatus can be miniaturized. .

In addition, a pallet conveyance speed twice that of the expansion and contraction speed of the piston rod of the hydraulic cylinder can be obtained, so that the replacement operation time of the pallet can be shortened.

Claims (3)

Pallet-mounted table provided with a support table mounted on the floor, a pair of guide paths which are supported on the support table so as to be pivotable 180 degrees in a horizontal plane on the top, and parallel to each other, and hooks engaged with the pallet at the ends. A pair of slide bars which are attached to each other and slide in opposite directions along the guide path, and a linear engagement portion provided on an upper surface of the pallet mounting table and a lower surface of the pair of slide bars, respectively, It is installed between the pallet mounting table and the pair of slide bars, and is co-located on the pallet mounting table and the cog wheels simultaneously engaged with the straight engagement portions provided on the pallet mounting table and the pair of slide bars, respectively. And an actuator for reciprocating linear movement of the gear wheel in a sliding direction of the slide bar. Palette exchanger, characterized in that the exchange between the palette and the machine tool table and the palette station. 2. The pallet exchange apparatus according to claim 1, wherein the straight engagement portion is formed by pulling the chain and attaching the chain, wherein the gear is a sprocket for engaging the chain. 2. The pallet exchanger according to claim 1, wherein the actuator is a hydraulic cylinder having a piston rod telescopically moved, and the gear wheel is rotatably supported at the end of the piston rod.

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