JPH0463658A - Automatic pallet exchanging device - Google Patents

Abstract

PURPOSE:To shorten the pallet exchanging time by providing a cam floor slidable along cam grooves of cam plates, and providing a link member rotatable centering on one point and a pair of actuators connected to one end of the link member and performing the linear drive via the link. CONSTITUTION:The table base of a machine tool are provided with pallets removably and movably to the right or left, and a pallet stocker is arranged in parallel with moving direction of the table base mounted with two pallets. An actuator 19 carrying pallets in or out is provided on the table base, the tip of the actuator 19 is connected to one end of a link member 21 rotatable centering on one point, and a cam floor 23 slidable along cam grooves of cam plates 24, 27 is provided. The link member 21 is rotated by the action of the actuator 19, thus the cam floor 23 is moved along the cam grooves of the cam plates 24, 27 to carry-in the pallets 4, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic pallet exchange device for a machine tool that automatically exchanges a pallet on which a workpiece is mounted.

[Prior Art] In a conventional automatic pallet exchange device that exchanges pallets on the table base of a machine tool equipped with a table base that allows pallets to be attached and detached and to move freely in the left and right directions, the pallet on the pallet stocker side An actuator was installed for each, and the actuators were operated sequentially to automatically exchange pallets.

A known example of this type is Utility Model Application No. 59-28435 (Automatic Pallet Exchange Apparatus) filed by the same applicant as the present application.

[Problem II to be Solved by the Invention] As shown in the same publication, this automatic pallet exchange device has the feature of being able to reliably exchange pallets and is a reasonably effective exchange device, but it is possible to exchange pallets in a shorter time. There was still room for improvement.

That is, when the table base moves in the left-right direction, the actuators corresponding to the pallets on the pallet stocker side have to be placed behind each other to avoid interference with the table base. Therefore, in contrast to the one-way movement of the actuator when loading and unloading the pallet, the actuator is required to perform two reciprocating movements, which increases the time required to replace the pallet.

Furthermore, the actuator has a long stroke for exchanging pallets, and the pallet stocker requires a relatively large floor area.

[Means to solve the problem] The present invention provides the following means to solve the problem.

In an automatic pallet exchange device for exchanging pallets with respect to a table base of a machine tool equipped with a table base in which a pallet can be freely attached and detached and can freely move in the left and right direction, the automatic pallet exchange device of the present invention has the following features: A table base that is detachable and freely movable in the left and right direction, a pallet racker equipped with two pallets arranged parallel to the direction of movement of the table base, and fixed to the upper end of the pallet. a cam plate with a linear cam groove; a link member that is rotatable about one point; a link member that is connected to one end of the link member; It is composed of a hydraulic cylinder that drives the

[Function] The automatic pallet changing device of the present invention functions as described below.

The table base of the machine tool is capable of attaching and detaching a pallet and is freely movable in the left and right direction, and the pallet picker is arranged parallel to the moving direction of the table base on which two pallets are mounted. An actuator for loading and unloading the pallet is provided on the table base, and the tip of the actuator is connected to one end of a link member that is rotatable around one point, and has a cam floor that can slide freely along the cam groove of the cam plate. ing. As the link member rotates due to the operation of the actuator, the cam floor moves along the cam groove of the cam plate and carries in the pallet.

After that, the table base is moved left and right, and then the cam floor is slid into the linear cam groove of the cam plate fixed to the upper end of the pallet to be replaced, and the operation of the actuator is repeated to replace the pallet.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are a plan view and a side view, respectively, showing an example in which a pallet changing device according to the present invention is used in a table-type horizontal boring and milling machine.

In the figure, reference numeral 1 indicates a machine tool. A pallet 4 is held by a pallet clamp unit 3 fixed on the table base 2 of this machine.

Further, an oil pan 5 is fixed to the machine below the table. A pallet exchange device W6 and a tip cover 7 are fixed on the oil pan 5, and the tip cover 7 is provided with a door 8 that automatically opens and closes when the pallet is exchanged. On the other hand, a pallet stocker 9 is installed on the front side of the machine, and a pallet 1
It is equipped with 0.

FIG. 3 is a sectional view showing details of the pallet clamp unit 3 on the table. This pallet clamp unit has a hydraulic cylinder 1 for pallet clamping/unclamping.
1 are built in at positions facing the table base 2. A flang plate 12 is fixed to the upper end of the rod of this hydraulic cylinder 11. Hydraulic pressure for the hydraulic cylinders 11 is supplied from center shafts 15 and 16, and separate pipes are provided to each of the four cylinders. Four taper cones 13 are fixed to the lower side of the pallet, and taper cones 14 are also fixed to opposing positions on the knotlet clamp unit 3. During pallet clamping, the pallet is positioned by the Taber cones 13 and 14 being engaged, and the pallet is held by the clamp plate 12.

When unclamping the pallet, the hydraulic cylinder 11 pushes up the clamp plate 12, lifts up the pallet 7, disengages the Taber cones 13 and 14, and the pallet can be transported.

FIG. 4 is a plan view showing details of the pallet exchange device 6.

In this embodiment, a hydraulic cylinder is used as the actuator, and the hydraulic clamp 17 is pivotally supported by a shaft 18.
The hydraulic cylinder 19 is rotatably supported by a shaft 20,
Hydraulic cylinders 17 and 19 are connected by a link member 21.

In addition, although not shown in the drawings, in order to prevent bending stress and buckling displacement that are applied to the rod during the expansion and contraction operations of the cylinder 17, a guide rail 30 is attached in the stroke direction of the cylinder and rotatably supported by the hook 22. The cam floor 23 moves along this guide rail 25.

Furthermore, a hook 22 is fixed to the tip of the rod of the cylinder 17, and a cam follower 23 is fixed to the lower side of the tip of the hook 22 via a shaft 22a, as shown in FIG.

The cam followers 23 provided on the hooks 22 and the cams 124a of the pallets engage with the pallets 4 and 10, and the pallets 4 and 10 can be carried in and out by the expansion and contraction operations of the hydraulic clamps 17 and 19.

The pallet 4.10 placed on the pallet base 7 is to be moved halfway in a straight line by the expansion and contraction movement of the hydraulic cylinder 17, and the cylinder 17 is rotated about the axis 18 by the expansion and contraction movement of the cylinder 19. The pallet 4 or 10 is moved along the guide rail 25 or 28 to carry in and take out the pallet.

At the stroke end point on the contraction side of the cylinder 17, a stopper 31 fixed to the hook 22 and a block 32 fixed to the cylinder 17 are engaged to prevent rotation of the hook 22 when the cylinder 17 pivots. It is composed of

Next, regarding the operation of this embodiment having such a configuration,
This will be explained with reference to FIG.

First, FIGS. 6-6 are diagrams showing a series of operations for carrying out the pallet 4 on the machine and carrying the pallet 10 on the pallet stocker into the machine based on a pallet exchange command.

In response to a pallet exchange command, the table base 2 of the machine body is first axially moved and positioned to the pallet exchange position as shown in FIG. 6 (2).

Next, by unclamping the pallet 4 on the table base 2, the cam arm 24a of the cam plate 24 of the pallet 4 and the cam follower 23 fixed to the hook 22 are engaged. At the same time, the door of the chip cover 7 opens and the pallet 4
A pair of hydraulic cylinders 17.
19 sequentially strokes in the contraction direction, the pallet 4 moves to the guide rail/clamp plate 12 on the table and the guide rail 2 on the pallet stocker side as shown in FIG.
5 in a straight line.

After the pallet 4 has been moved to the stroke end, the locating pin 26 enters the locating pin hole 4a of the pallet 4 to position and hold the pallet 4. In this state, the axis of the table base 2 of the machine is moved. At this time, the cam follower 23 is inserted into the groove 2 of the hook 24 as shown in FIG.
It moves together with the table while rolling in 4a, and after detaching from the hook 24, the hook 27 engages. After the axial movement of the table is completed, the logate bin 27 is removed from the pallet 10.Then, the hydraulic cylinders 19 and 17 are sequentially stroked in the extension direction as shown in FIG. Next, as shown in Fig. 6 (■), clamp the pallet 10 on the table, and at the same time close the door 8 of the chip cover 7.
Complete pallet exchange operation.

[Effect of the invention 1 As explained above, according to the present invention, the workpiece diagram, the sixth
Figures ■-■ are plan views showing a series of operations for loading and unloading pallets on the pallet stocker to and from the machine.

In a pallet changing device, the pallet changing time can be shortened compared to prior art devices, and the floor base of said device can also be made smaller.

Additionally, since the pallet exchange unit is installed on the table base side of the machine, it is only necessary to install one on the pallet exchange actuator regardless of the number of pallets, making it easy to increase or delete the number of pallets. .

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a side view, respectively, showing an example in which the pallet changing device according to this embodiment is used in a table type horizontal boring milling machine, and Figure 3 shows details of the pallet clamp unit on the table. 4 is a plan view showing details of the pallet exchange device, and FIG. 5 is a cross section taken along line A-A in FIG. 4. 1: Machine tool, 2: Table base,
3: Pallet clamp unit, 4: Pallet, 6:
Pallet exchange device, 9: Pallet stocker, 10: Pallet, 17, Hydraulic cylinder, 18: Shaft 19: Hydraulic cylinder, 21: Link member, 22: Hook 23: Cam follower, 24.27: Pallet cam plate, 24a, 27a : Cam Wei,

Claims (2)

[Claims] (1) In an automatic pallet exchange device that exchanges pallets with respect to the table base of a machine tool equipped with a table base that allows pallets to be attached and detached as well as to move freely in the left and right direction, parallel to the direction of movement of the table base. A pallet stocker that can freely mount two pallets arranged on the pallet, a cam plate with a linear cam groove fixed to the upper end of the pallet, and a cam floor that can freely slide along the cam groove of the cam plate, and a single point. An automatic pallet exchange device comprising: a link member rotatable around the link member; and a pair of actuators that are connected to one end of the link member and perform linear drive connected via the link. (2) The automatic pallet changing device according to claim 1, wherein the actuator is a hydraulic cylinder.