JPH0731947Y2 - Pallet changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a pallet table changing device having a workpiece mounted on the upper surface thereof.

(Prior Art) Various systems have been implemented in which a workpiece is attached to a pallet table in advance in response to a factory automation requirement and the pallet table is sequentially exchanged and supplied to a machine tool. In a pallet table changer used for a large machine tool, as shown in FIG. 6, a guide rail 2 provided on a pallet base 7 on the machine tool side is lifted by a cylinder 3 or the like during transfer of the pallet table 1. The seating surface 4 of the pallet base 7 and the reference surface 5 on the back surface of the pallet table 1 are prevented from coming into contact with each other, and the pallet table 1 is conveyed on the guide rail 2 through the rollers 6 attached to the lower surface of the pallet table 1. When comes to a fixed position, the cylinder 3 is lowered to bring the seating surface 4 of the pallet base 7 into contact with the reference surface 5 on the rear surface of the pallet table 1, and the positioning is performed by a plurality of locating pins (not shown).
The pallet table 1 is clamped on the pallet base 7 by the flange portion of the guide rail 2 lowered by the cylinder 3 and is supported with high precision by sufficient rigidity to withstand machining. Further, on the back surface of the pallet table 1, there are fixed racks (not shown) with both ends thereof extending outward from the ends of the pallet table 1 in the sliding direction of the pallet table 1. A pinion (not shown) for driving the pallet table 1 is connected to all the ends of the. Thus, when the pallet table 1 is moved, the tip of the rack meshes with the pinion from the horizontal direction, and when the pinion is rotationally driven, the pallet table 1 moves on the guide rail 2 together with the rack.

(Problems to be solved by the invention) As described above, since the pallet table used for a large-sized machine tool is large, the weight of the pallet table and the weight of the workpiece are considerably heavy. Therefore, the hydraulic pressure for pushing up the guide rail is increased. A large number of cylinders are required, and a lot of piping is required to accompany it, which causes a price increase.

Furthermore, the pallet table is supported by the setup station and rollers during transportation, and during machining, the reference surface of the pallet base and the seating surface on the back of the pallet table are in close contact and clamped. The mounting condition may change between when the product is taken and during machining.

Moreover, the rack had to be fixed over the entire back surface of the pallet table 1, and a pinion that meshed with this had to be prepared.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pallet changing device which has a simple structure, can process a workpiece with high accuracy, and is inexpensive.

[Means for Solving the Problem] (Means for Solving the Problems) In order to achieve the above object, a pallet exchanging device of the present invention has a plurality of pallet tables mounted in parallel on an upper surface thereof and a transfer direction of the pallet table to a machine tool. In a pallet exchanging device for exchanging the pallet table between a pallet table movable in a direction perpendicular to the pallet table and a pallet base of the machine tool; fixed to upper surfaces of the pallet base and the pallet table along the transfer direction, respectively. Linear movement type bearing rail, a linear movement type bearing unit fixed to the back surface of the pallet table and guided by the linear movement type bearing rail to roll, and the pallet table by the linear movement type bearing unit. While being supported by the linear movement type bearing rail of the base, A locating pin provided between the pallet base and the pallet table so as to position the let-table for the pallet base,
A pallet table including a piece mounted on the tip of a rod of a cylinder that is provided on the side surface of the pallet base and can be reciprocated for a predetermined distance, and a plurality of blocks provided on the side surface of the pallet table and provided at positions corresponding to the predetermined distance. It is characterized in that it comprises a transfer device for transferring between the pallet base and the pallet base.

(Operation) The pallet table is conveyed by the engagement of the piece mounted on the tip of the rod of the cylinder, which is supported by the linear movement type bearing rail and the linear movement type bearing unit and provided on the pallet base, and the plurality of blocks provided on the pallet table. The pallet table transferred onto the pallet base by the transport device is supported with high precision by the bearing rail and the bearing unit with sufficient rigidity to withstand machining and a guide function without play due to preload. It is positioned with respect to the pallet base by the locate pin provided between the pallet tables.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a side view and a plan view of a plano mirror to which the present invention is applied, and FIG. 3 is a front view seen from the right side of FIG. Columns 12 are erected on both sides near the center of the bed 11 in the longitudinal direction, and cross rails 13 are attached to the upper portions of the columns 12 and the main wheel heads 14 are placed horizontally on the cross rails 13. It is provided so that it can move in any direction. A ram 15 is attached to the main wheel head 14 so as to be vertically movable, and a head 16 on which a tool is attached is attached to the tip of the ram.

A pallet base 21 is mounted on the upper surface of the bed 11 so as to be capable of reciprocating in the longitudinal direction thereof, and a pair of linear movement type bearing rails 22 extending in the longitudinal direction of the bed 11 are fixed to the upper surface of the pallet base 21. Rails for this bearing 22
A pallet table 31 is placed on the pallet table 31, and a plurality of linear movement type bearing units 32 fixed to the back surface of the pallet table 31 are used for the bearing rails 22.
The pallet table 31 is moved (loaded) by the bearing unit 32 from the right side to the bearing rail 22 in FIGS. 1 and 2 and is also moved by the bearing unit 32. 22 It is designed to be transferred (delivered) from the top to the right. The linear movement type bearing rail 22 and the linear movement type bearing unit 32 are of a type that rolls by being given a preload, and commercially available types can be used.

A locator pin 23 shown in FIG. 4 is connected to the cylinder chambers 24a and 24b of the cylinder 24 on the pallet base 21 to provide a pressure oil supply port 2
It is mounted so as to be able to move up and down in the vertical direction by pressure oil from a hydraulic pressure supply device (not shown) supplied to 5a, 25b. On the back surface of the pallet table 31, when the pallet table 31 is at a predetermined position on the pallet base 21, a locate bush 33 is fixed at a position to engage with the locate pin 23, and the collar portion 34 of the locate bush 33 has a left side surface in FIG. Is finished to be flat so as to contact the stopper portion 26 provided on the pallet base 21 side, and the right side surface is a sloped surface 33a that engages with the sloped surface 23a of the locate pin 23. Further, as shown in FIG. 5, a plurality of blocks 35 are attached to the side surface of the pallet table 31, and engage with a piece 64 attached to the rod tip of a transfer cylinder 62 of a transfer transfer device 60 described later. The pallet table 31 is conveyed by using the pallet table 31.

A setup station 50 is provided on the right side of the bed 11 in FIGS. 1 and 2. Setup station
A pallet table 52 is mounted on a base 51 of 50 so as to be movable by a hydraulic cylinder (not shown) in a horizontal direction orthogonal to the transfer direction of the pallet table 31 with respect to the pallet base 21. Plural sets (two sets in this embodiment) on the upper surface of the pallet base 52.
Rails 53 for linear movement type bearings are mounted at the same pitch as the rails 22 for bearings on the upper surface of the pallet base 21 respectively, and the pallet table 31 and the pallet base 52 and the pallet are mounted by the linear movement type bearing unit 32 mounted on the back surface of the pallet table 31. It can be transported to and from the base 21.

In FIG. 2 and FIG. 5 of the pallet base 52, transfer carrier devices 60 are provided on both left and right sides, and the rod tips of the upper and lower cylinders 61 are fixed to the bracket 63 so that they move up and down together with the transfer cylinder 62. , Block 64 attached to the rod tip of the transfer cylinder 62 and the side surface of the pallet table 31
It is designed to engage and disengage with 35.

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

An initial state will be described in which two pallet tables 31 are on the side of the co-setup station 50, a workpiece is mounted on at least the pallet table 31 in the exchange position, and the pallet base 21 is also in the exchange position.

When the pallet table 31 is on the pallet table 52, the block 35 on the side surface of the pallet table 31 and the piece 64 attached to the rod tip of the transfer cylinder 62 are always engaged with each other. In accordance with a command from an NC control device (not shown), the transfer cylinder 62 moves forward to move the pallet table 31 on the bearing rail 53 of the pallet base 52 to the pallet base 21.
It is conveyed toward the bearing rail 22 of. When the stroke limit of the transfer cylinder 62 is detected, the upper and lower cylinders 61 are lowered, the block 35 on the side surface of the pallet table 31 is disengaged from the piece 64 of the transfer cylinder 62, and the transfer cylinder 62 is retracted. When the backward limit of the transfer cylinder 62 is detected, the upper and lower cylinders 61 move up, the next block 35 located rearward in the transfer direction and the piece 64 of the transfer cylinder 62 are engaged again, and the pallet table
31 starts to move forward again. When the above operation is repeated several times, the pallet table 31 moves from the pallet base 52 to the pallet base 21.
Stopper that is transferred to the top and fixed to the pallet base 21
Locate bush attached to pallet table 31 to 26
The flat surface portion of the collar portion 34 of 33 abuts, and the transport operation is completed. In addition,
The upper and lower cylinders 61 are stopped at the lower limit and the transfer cylinder 62 is stopped at the upper limit.

When the completion of transfer of the pallet table 31 onto the pallet base 21 is detected, pressure oil is supplied to the pressure supply port 25b of the cylinder 24, and the locate pin 23 rises to locate the pin.
The sloped surface 23a of 23 and the sloped surface 33a of the collar portion 34 of the locate bush 33 fixed to the pallet table 31 are pressure-contacted, and the locate bush 33 fixed to the pallet table 31 is pinched by the stopper 26 and the locate pin 23 to play. The pallet table 31 is positioned on the pallet base 21 in the non-existing state. In the direction orthogonal to the carrying direction, a preload is provided between the bearing rail 22 and the bearing unit 32, and the carrying is carried without play.

Machining starts in this state, but the pallet table
The pallet base 21 is held on the pallet base 21 by the linear movement type bearing rail 22, the linear movement type bearing unit 32, the stopper 26 and the locating pin 23 with sufficient rigidity with high precision, and good machining is performed. Pallet table on the setup station 50 side during this machining
The work piece to be processed next is mounted on 31.

When the machining of the workpiece on the pallet table 31 is completed, a pallet table 31 replacement command is issued, and the pallet base 21 moves to the replacement position. Next, the upper and lower cylinders 61 move up and the block 35 of the pallet table 31 and the transfer cylinder
The piece 64 of 62 is engaged with the cylinder chamber 24 of the cylinder 24.
Pressure oil is supplied to the pressure oil supply port 25a leading to a, the locate pin 23 descends, and the pallet table 31 becomes movable. When the transfer cylinder 62 retreats and reaches the retreat limit, the upper and lower cylinders 61 descend, the block 35 and the piece 64 are disengaged, and the transfer cylinder 62 advances and repeats the above-described operation.
When the transfer of the pallet table 31 to the pallet table 52 is completed, the block 35 on the side surface of the pallet table 31 and the piece 64 of the transfer cylinder 62 are stopped in the engaged state.

Next, the pallet table 52 is moved on the base 51 by a hydraulic cylinder (not shown), the new pallet table 31 is set to the replacement position, and the above operation is repeated by the transfer cylinder 62 on the new pallet table 31 side to set the new pallet table 31 to the pallet base.
Transport to 21 side.

[Advantage of Invention] As described above, according to the present invention, when the pallet table is moved, it is not necessary to push up the moving rail,
Moreover, holding and positioning of the pallet table can be achieved sufficiently with one locate pin under sufficient rigidity, so not only unnecessary piping parts are unnecessary, but also the piping work can be saved and the pallet table can be set up. Since the supported state does not change between the time and the machining process, there are great advantages such as higher precision machining, and the rack fixed on the entire back surface of the pallet table and the rack that meshes with it. It is possible to obtain an inexpensive pallet changing device that does not require a pinion to operate.

[Brief description of drawings]

FIG. 1 is a side view of a plano mirror to which the present invention is applied, and FIG.
Figure is the same plan view, Figure 3 is the same front view, Figure 4 is Figure 2 IV-
FIG. 5 is an enlarged view of the locate pin section of the IV line cross section, FIG. 5 is a view showing the mechanism of the transfer carrier, and FIG. 6 is a view showing a conventional technique. 21 …… Pallet base, 22 …… Bearing rail, 23
...... Locating pin, 24 ...... Cylinder, 31 ...... Pallet table, 32 ...... Bearing unit, 33 ...... Locating bush

Claims (1)

[Scope of utility model registration request] 1. A pallet table between a pallet base of the machine tool and a pallet table on the upper surface of which a plurality of pallet tables are mounted in parallel and movable in a direction perpendicular to the transfer direction of the pallet table with respect to the machine tool. A linear movement type bearing rail fixed to the upper surfaces of the pallet base and the pallet base along the transfer direction, and a linear movement type bearing rail fixed to the back surface of the pallet table. A linear movement type bearing unit which is guided and rolled by the linear movement type bearing unit, and the pallet table is positioned with respect to the pallet base while the pallet table is supported by the linear movement type bearing rail of the pallet base. Therefore, the pallet base and pallet Locating pin provided between the pallet table, a piece attached to the side of the pallet base and attached to the rod tip of the cylinder that can be reciprocated for a predetermined distance, and a position provided on the side of the pallet table at a position corresponding to the predetermined distance. A pallet exchanging device comprising: a pallet base and a pallet base for transporting a pallet table by a plurality of provided blocks.