JPS61197145A - Device for workpiece loading and unloading to workpiece table - Google Patents

Abstract

PURPOSE:To make it possible to prevent a conveyor from sticking of splashes by retracting a relay conveyor from the vicinity of a machining position and providing a gate working cocurrently with the relay conveyor. CONSTITUTION:A jig base 7 on which a workpiece 3 is to be placed is fitted to a workpiece table 2a in capability of being exchanged. And a conveyor 4 is installed keeping a constant distance from the workpiece table 2a and in right and left direction along a conveyor, and a relay conveyor 5 is provided at a relay position between the conveyor 4 and the workpiece table 2a. In addition, at the lower section of the relay conveyor 5, a gate 6 extending downward is formed in a body. The relay conveyor 5 is constituted so as to be positioned at a retracting level, i.e., the highest position, workpiece loading and unloading level, i.e., intermediate position, and jig exchanging level, i.e., the lowest position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is used in the technical field of machine tools, and particularly relates to a device for loading and unloading a work onto a work table.

(Prior art) Numerical control (NG) machine tools, etc. are equipped with a conveyor for carrying in and out of workpieces near the work table, and the workpieces are sequentially transferred and set on the machine tool for processing. It has a structure. However, when a workpiece set on a machine tool has many parts to be machined in different positions, it requires space to rotate or turn over, so the conveyor is placed at a certain distance from the worktable. It is set aside.

Therefore, a relay means such as a relay conveyor is required in the space, and conventionally, a relay conveyor is provided attached to the work table side. However, these conveyors are often formed by roller conveyors, and when a workpiece is processed on a work table, flying objects such as chips adhere to the surrounding relay conveyors and transfer conveyors. Since it gets stuck inside each conveyor and impairs its function, not only is it troublesome to maintain and manage the conveyor, but there is also the risk of damaging the work being transported. Furthermore, in order to maintain safety during work processing, an opening/closing door is required between the work table and the conveyor.

Since such an opening/closing door is an independent piece of equipment, it involves the troublesome work of closing it when processing a workpiece and opening it when transporting the workpiece. Furthermore, when machining workpieces with different shapes, a jig stand is removably attached to the worktable, and heavy jig stands are replaced on the worktable depending on the workpiece, but this process requires a lot of time and effort. There was also the problem of necessity.

(Object of the Invention) In view of the above-mentioned problems of the conventional art, the present invention is designed to evacuate a relay conveyor from the vicinity of the workpiece processing position during workpiece processing, and to prevent scattered objects from moving onto the conveyor by an opening/closing door that operates simultaneously with the relay conveyor. It is an object of the present invention to provide a workpiece loading/unloading device that prevents the workpiece from adhering to the workpiece and also allows the relay conveyor to be used for jig replacement work.

(Structure of the Invention) Means for achieving the object of the present invention includes a conveyor provided along a work table equipped with a jig stand for placing a work, and a conveyor between the conveyor and the work table. It consists of a relay conveyor that is interposed at a relay position and transports the work to the work table, and the relay conveyor is supported so as to be able to move up and down. The door is integrally provided in such a positional relationship that it closes the relay position when the relay conveyor is raised and is at the evacuation level, and opens the relay position when the relay conveyor is lowered and is at the work loading/unloading level. A workpiece loading/unloading device to a worktable, characterized in that a driving means is provided for operating the relay conveyor at three positions: a shelter level, a workpiece loading/unloading level, and a jig table exchange level lower than the workpiece loading/unloading level. Pertains to.

The effect of the above means is that when the relay conveyor is positioned at the uppermost retraction level during workpiece processing,
An opening/closing door is located between the work table and the conveyor, so that the relay position is closed, and the relay conveyor is located above the work table so that flying objects do not adhere thereto.

In addition, when the relay conveyor is positioned at the intermediate workpiece loading/unloading level, the conveying surface of the relay conveyor becomes the same plane as the conveying surface of the conveyor, and also almost the same plane as the top surface of the jig table, so that the conveyor is not conveyed. The workpiece that comes in can be carried in and out of the jig table. Furthermore, if the relay conveyor is positioned at the lowest jig table exchange level, the conveyance surface of the relay conveyor becomes almost the same as the top surface of the workpiece table on which the jig table is placed, and the jig table can be replaced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In addition, in FIG. 1, the direction in this description is referred to as the lower side as the front and the upper side as the rear side.

A workpiece loading/unloading device 1 according to the present invention includes a conveyor 4 that conveys a workpiece 3 along a numerically controlled machine tool 2.

The work table 2a includes as main components a relay conveyor 5 that relays and transfers the work 3 between the work table 2a and the conveyor 4, and an opening/closing door 6 formed integrally with the relay conveyor. A jig table 7 on which the workpiece 3 is placed is replaceably mounted. The transport conveyor 4 is provided at a distance from the work table 2a in the left-right direction along the transport conveyor, and a relay conveyor 5 is provided at a relay position between the transport conveyor 4 and the work table 2a. At the bottom of the relay conveyor,
An opening/closing door 6 extending downward is integrally formed, and the relay conveyor 5 is at the uppermost evacuation level (shown by the solid line in FIG. 2);
Work loading/unloading level at intermediate position (shown by double-dashed line in Figure 2)
It can be positioned in three positions: and the lowest jig exchange level (shown by a dashed line in FIG. 2).

The details of each part will be further explained below.

The work table 2a is provided on the turntable 2b, and is formed to be able to fix the jig table 7. The turntable 2b is rotated by a cylinder device 2c. 2d is a spindle of the numerically controlled machine tool 2, which is movable back and forth, left and right, and up and down.

The workpiece 3 is, for example, a semi-finished cylinder head,
They are sequentially prepared on a work pool 2e provided on the left side of the transport conveyor 4, and are pressed and fixed onto a jig table 7 by a cylinder assembly M2g provided on a work table 2a.

Jig stands 7 corresponding to the shapes of various workpieces 3 are prepared in the jig stand storage area 2f.

The conveyor 4 is configured as a free roller conveyor, and the upstream (right side in FIG. 1) conveyor 4a
and a downstream side (left side in FIG. 1) conveyor 4b. The upstream end of the upstream conveyor 4a is connected to the work pool 2c, and the downstream end of the right conveyor 4b is connected to the next processing step. Also, the upstream conveyor 4a
The width of the opposing portion of the downstream conveyor 4b is reduced and is configured as a movable conveyor 4d pivoted by a hinge 4c, and the movable conveyor can be moved by flipping it upward. This is to open the front of the relay conveyor 5, which is located at a lower jig table exchange level than the conveyor 4d, to facilitate handling of the jig table 7 placed on the relay conveyor.

The relay conveyor 5 has guides 5a erected on the left and right sides.

5a, and the vertical position is controlled by a driving means 5b such as a cylinder device, and the front part of the relay conveyor 5 consists of a free roller conveyor running in the same direction as the transport conveyor 4. An auxiliary transport conveyor 5c is formed so as to be located coaxially with the movable conveyor 4d, and the rear part is a relay conveyor main body consisting of a free roller conveyor in the front and back direction for connecting the auxiliary transport conveyor 5c and the work table 2a. 5d is formed. Further, a leg 5e is provided at the lower part of the relay conveyor 5 to protrude downward, and the protruding length of the leg #5e is adjusted by a screw means. The driving means 5b includes a first confirmation switch 5f for confirming that the relay conveyor 5 is at the uppermost position, and a second confirmation switch 5f for confirming that the relay conveyor 5 is at the intermediate position.
A confirmation switch 5g is provided on the guide 5a, and a third confirmation switch 5h is provided on the guide 5a for confirming that the relay conveyor 5 is at the lowest position. A protrusion 5j is protrudingly provided on which a stopper 51 for guiding the transfer of the jig table 7 during replacement is removably fitted.

The opening/closing door 6 is constructed by attaching a transparent plate 6b to a frame 6a that is integrated with the relay conveyor 5 and extends downward. The tip of the piston rond of the drive means 5b is hinged to the tip of a bracket 6c provided integrally with the frame 6a of the opening/closing door 6, so that the relay conveyor 5 is moved up and down by the expansion and contraction of the drive means 5b. Furthermore, the guide 5a
When the relay conveyor 5 is in the intermediate position,
Positioning stopper 5k that engages with the lower end of the bracket 6c
(See No. 3 @) is provided. The positioning stopper 5 is configured so that it can be disengaged from the bracket 6c when the relay conveyor 5 is further lowered from the engagement position.

Next, the operation of this embodiment will be described.

In FIGS. 1 to 3, the relay conveyor 5 is at the uppermost retraction level, the opening/closing door 6 integrated with the relay conveyor 5 is in a state of vertically closing the front of the work table 2a, and the spindle 2d While it functions as a safety cover when processing the workpiece 2 with a tool (not shown) attached to 1, flying objects such as chips generated at this time are blocked by the opening/closing door 6. will not stick to the surface. Of course, since the relay conveyor 5 is also located at a distance above, there is no possibility of flying objects adhering to it. ``When processing of the workpiece 3 is completed, the fixation of the workpiece 3 is released by the cylinder device 2g, and the drive means 5b is activated to lower the relay conveyor 5. Then, the bracket 6c comes into contact with the positioning stopper 5k, and the relay conveyor 5 is controlled to the intermediate position shown by the two-dot chain line in FIG. In this state, the top surface of the rollers of the relay conveyor 5 is aligned with the top surface of the transport conveyor 4 and is at a position slightly higher than the top surface of the jig table 7. At this time, the opening/closing door 6 is lowered to open the relay position. Then, the workpiece 3 is placed on the relay conveyor main body 5d of the relay conveyor 5 from the jig table 7 and transferred forward, and then sent to the next process by the auxiliary conveyor 5c, the movable conveyor 4d, and the downstream conveyor 4b.

Next, the unprocessed work 3 is carried in from the work pool 2e by the upstream conveyor 4a, the movable conveyor 4d, and the auxiliary conveyor 5c, and is further transferred to the rear by the relay conveyor main body 5d in front of the work table 2a, and is transferred to the jig table. After being positioned on the jig table 7, it is fixed on the jig table 7 by the cylinder device 2g. Then, the relay conveyor 5 is raised by the operation of the driving means 5b, and the relay conveyor 5 is controlled to the uppermost position by the operation of the first confirmation switch 5f, the opening/closing door 6 is closed, and the same processing operation as described above is performed. It will be done.

A large number of works 3 having the same shape prepared on the work pool 2e are sequentially processed by repeating the above operations.

On the other hand, when the shape of the workpiece 3 is changed and it becomes necessary to replace the jig table 7, the positioning stopper 5k is retracted so as not to engage with the bracket 6c, and the movable conveyor 4d is indicated by the two-dot chain line in FIG. After flipping it up so that it does not get in the way of the jig table exchange, actuate the drive means 5b and lower the relay conveyor 5 until the third confirmation switch 5h is activated to reach the lowest jig table exchange level. (See the one-dot chain line in Figures 2 and 3).

At this time, the upper surface of the relay conveyor 5 is placed on the work table 2a.
The position will be slightly higher than the top surface of the . In addition, the length of the leg 5e is adjusted so that its lower end touches the top surface of the turntable 2b, so it serves as a support when a heavy jig table 7 is placed on the relay conveyor 5. . Further, a stopper 51 is fitted onto the protrusion 5J to guide the jig table 7 during transfer (see FIG. 4). Then, the jig table 7 on the work table 2a is removed, placed on the relay conveyor 5, and returned to the jig table storage area 2f.
The jig table 7 is placed on the work table 2a and fixed to complete the replacement of the jig table 7.

In this embodiment, the relay conveyor 5 includes a conveyance auxiliary conveyor 5c and a relay conveyor main body 5d, but it is also possible to use only the relay conveyor main body 5d.

Furthermore, the movable conveyor 4d may be slid laterally so that it does not get in the way when the jig table 7 is replaced.

(Effects of the Invention) As described above, the present invention includes a conveyor provided along a work table equipped with a jig table for placing a work,
It consists of a relay conveyor that is interposed at a relay position between the transfer conveyor and the work table and carries workpieces into and out of the work table.The relay conveyor is supported so as to be able to move up and down. An opening/closing door that opens and closes the relay position with the transfer conveyor closes the relay position when the relay conveyor rises and is at the evacuation level, and opens the relay position when the relay conveyor descends and is at the work loading/unloading level. The relay conveyor is integrally provided in such a positional relationship, and is characterized by being provided with driving means for operating the relay conveyor in three positions: a retraction level, a workpiece loading/unloading level, and a jig table exchange level lower than the workpiece loading/unloading level. Since this is a device for loading and unloading workpieces to and from a work table, when processing a machine tool, by positioning the relay conveyor at the evacuation level, the opening/closing door can be closed and the relay conveyor can be separated from the vicinity of the workpiece processing position. Safety is ensured and there is no risk of flying debris from processing operations adhering to each conveyor. In addition, if the relay conveyor is lowered and positioned at the work loading/unloading level or the jig stand exchange level, the opening/closing door opens and the relay position is opened, making it easy to replace workpieces and jig stands. The lifting operation of the relay conveyor and the opening/closing operation of the opening/closing door relative to the position are controlled by a single driving means, which has the effect of significantly improving safety and workability in processing workpieces.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a plan view of the work loading/unloading device, FIG. 2 is a side view partially shown in cross section, FIG. 3 is a front view of the same, and FIG. It is a side view which expanded and showed a part of relay conveyor. 1...Work loading/unloading device, 2a...Work table, 3...Work, 4...Transportation conveyor, 5...Relay conveyor, 5b... ...
Drive means, 5c... Transfer auxiliary conveyor, 5d.
...Relay conveyor body, 6...Opening/closing door. Part 2 Part 3 Part 4 Figure

Claims (1)

[Claims] (1) A conveyor installed along a work table equipped with a jig table for placing the work, and a conveyor placed at a relay position between the conveyor and the work table to carry the work to the work table. The relay conveyor is supported such that it can be raised and lowered, and the relay conveyor has an opening/closing door that opens and closes the relay position between the work table and the transfer conveyor, and the relay conveyor is raised to a retraction level. When the relay conveyor is at the evacuation level, the workpiece loading and unloading level, the relay position is closed and the relaying position is opened when the relay conveyor is at the evacuation level, the workpiece loading and unloading level. A device for loading and unloading a work onto a work table, characterized in that it is provided with a drive means that operates at three positions, including a jig table exchange level lower than the loading and unloading level of the work.