JPH0787962B2 - Lifting device for heavy load change - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a step-change lifting device used for exchanging heavy objects, and more specifically, a die block and a transfer device provided in a horizontal hot forging machine. The present invention relates to a step change lifting device.

[Conventional technology and its problems]

As is well known, die blocks, transfer devices, etc. provided in a horizontal hot forging machine are often replaced in the production of small quantities of various forged products. Since the device for exchanging old and new dies, that is, the stage changing device descends the mold in a narrow space, the stop position system of the stage changing lifting device is important.

By the way, as a stepping lifting device of a conventional horizontal hot forging machine, for example, a lifting crane using a wire is known, but in the case of such a device, the stop position accuracy is due to the stop positioning by manual inching operation. Low and annoying.

Further, in a device for performing die replacement with a die block provided with a plurality of parallel dies, which is halved above and below a horizontal line connecting the axes of the die blocks and which is held in the upper die block and taken out of the machine frame. A device is known in which the upper die block is lifted by a dedicated stepping lifting device.
In the case of such a device, since the stop positioning is performed by the stopper or the motor control, and moreover, since the hoisting distance between the machine frame or the lower die block and the traveling part of the stepping lifting device is long, the traveling part stops at a predetermined position. However, it is difficult to obtain stop position accuracy.

[Means for solving problems]

Therefore, the present invention was created with a focus on completely eliminating the disadvantages of the prior art, and is attached to the running part,
Also, in a step change lifting device including a lifting unit that lifts and holds a heavy object in a detachable manner, an upper frame, an intermediate frame and a lower frame that are movable in the X or Y direction with respect to the upper frame, A heavy object is held via an XY floating mechanism composed of an XY lock cylinder capable of fixing the intermediate frame and the lower frame to the upper frame, and a guide hole or notch provided in the heavy part. An object of the present invention is to provide a lifting / lowering device for heavy object stage change, in which guide pins set up in an assembly object are fitted and guided to each other and a heavy object is assembled to the stage object.

〔Example〕

The configuration of the present invention, together with its operation, will be described in detail with reference to embodiments shown in the drawings. The present embodiment is, for example, a step change lifting device for integrally changing a die block, a punch holder and a transfer device provided in a horizontal hot forging machine for forging outer races of gears and bearings. First of all, an outline will be given. In FIG. 1, such a step-change lifting device includes one set of traveling parts A, two sets of elevating parts B attached to the traveling parts A, and vertical and horizontal directions in a horizontal plane. It is configured to include a freely movable mechanism, a so-called XY floating mechanism C (however, only one set of the elevating part B and the XY floating mechanism C is shown in FIG. 1), and the traveling is performed. The portion A is configured to reciprocate on the rail 1 in the a direction by a motor (not shown).

The elevating part B is supported by a linear bearing 3 attached to the elevating mast 2, as shown in FIG. It has sufficient rigidity so that it will not tilt even if the center of gravity of the suspended object such as the transfer device 18 moves. The lifting mast 2 uses a fixed mast (not shown) set up in the running portion A as a guide. A rack 4 is attached to the lifting mast 2, meshes with a pinion (not shown), and the lifting unit B is raised and lowered in the b direction by driving the pinion. A lifting jig 5 is attached to the lower part of the lifting mast 2 via an XY floating mechanism C. The XY floating mechanism C includes the frame 6, the intermediate frame 7, and the lower frame 8 as shown in FIG.
And an XY lock air cylinder 9. The intermediate frame 7 is supported with respect to the upper frame 6 via a linear bearing 10 so as to be freely movable in the X direction, that is, the a direction. A lower frame 8 is suspended from the intermediate frame 7 via linear bearings 11 and 11 so as to be freely movable in the Y direction (direction perpendicular to the paper surface). A pair of left and right springs 12 are installed between the upper frame 6 and the intermediate frame 7 to regulate movement in the X direction and centering. Similarly, a spring (not shown) is also installed between the intermediate frame 7 and the lower frame 8 to regulate the movement in the Y direction and perform centering. And
The set length of the spring 12 can be adjusted by a spring rod 13. Further, the upper frame 6 is an air cylinder 9 mounted on a cylinder frame 9b.
The XY fixing rod 9a operated by the above is installed downward, and by inserting the tips of the rod 9a into the holes 14 and 15 of the intermediate frame 7 and the lower frame 8, the intermediate frame with respect to the upper frame 6 is inserted. The X and Y operations of 7 and the lower frame 8 are locked. Note that the XY operation is normally locked when the step-change lifting device is running, and is unlocked so that the XY motion is possible during lifting.

As shown in FIG. 1 and FIG. 4 below the hoisting jig 5, a die block 16, a punch holder 17, and a transfer device 18 are integrally and detachably held, and are used for hoisting. The upper part of the jig 5 is fixed to the lower frame 8 as described above. The lifting jig 5 includes
As shown in the drawing, extension plates 19 and 20 extending outward are provided, and the extension plates 19 and 20 are provided with holes 21 and notches 22. The hole portion 21 and the notch 22 are adapted to be fitted to an assembly object for assembling a suspended object, that is, guide pins 23 and 24 set up in the forging machine body. The guide pin
Chamfers 25 are provided at the tips of the holes 23 and 24 so that the holes 21 and the notches 22 can be fitted smoothly.

Since this embodiment has the above-mentioned configuration, the following operation is performed. That is, the step-changing lifting device of the present embodiment is designed so that a new die (the die block 16, the punch holder 17, the transfer device 18, etc.) can be moved by pressing a button.
Elevator B of the set, and XY locked for XY operation
It is held by the floating mechanism C, and the elevating part B and the traveling part A provided with the XY floating mechanism C are moved forward and stopped at a predetermined position (position for lifting the old mold). At the same time, the other pair of lifts B and X-
With the XY floating mechanism C in which the Y motion is released, the old die mounted on the horizontal hot forging machine is guided by the guide pins 23, 24.
Then, the XY floating mechanism C lifts up without being twisted while absorbing the positional deviation, and then the traveling unit A is further advanced and stopped at a predetermined position (position for mounting a new mold).

Then, the new mold is lowered by the elevating part B in which the XY operation is released, but the hole 21 and the notch formed in the lifting jig 5 and the notch.
The 22 is fitted and guided by the guide pins 23 and 24 set in the main body of the forging machine, and lowered. At the beginning of the guide, the chamfer 25 fits while absorbing some displacement of the running portion A, swinging of the new mold, deflection of the girder due to movement of the center of gravity of the new mold, etc. When the tool 5 is completely fitted to the guide pins 23 and 24, if there is a deviation between the stop position for the new mold of the traveling section A and the position of the guide pins 23 and 24, X
-Y The floating mechanism C automatically performs the adjustment to perform a smooth hanging operation. This completes the work of changing the old and new molds. The old die suspended from the traveling unit A is taken out of the machine frame by retracting the traveling unit A.

If the speed of a motor (not shown) for raising and lowering the raising and lowering section B is controlled, it is not necessary to perform a manual inching operation during raising and lowering.

As described above, in short, since the present invention adopts the configuration described in the claims, the following effects can be expected.

〔The invention's effect〕

Even if the distance for lifting the heavy object is large between the traveling part and the body to which the heavy object is to be assembled, the stopping error of the traveling part and the heavy object are caused by the XY floating mechanism and the guide pin. It is possible to improve the accuracy of the suspension position of the heavy object caused by the deflection of the girder of the traveling part or the elevating part due to the movement of the center of gravity, and the looseness of these mechanical systems, and the position of the assembly. As a result, the changeover time can be shortened.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a detailed view of an essential part of FIG. 1, FIG. 3 is a view taken along the line P--P of FIG. 1, and FIG. 4 is Q of FIG. -Q sectional drawing is shown. A: Traveling part B: Elevating part C: XY floating mechanism 6 ... Upper frame 7 ... Intermediate frame 8 ... Lower frame 9 ... XY lock air cylinder 21 ... Hole 22 ... … Notch 23 …… Guide pin 24 …… Guide pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Yamada 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Iwa Izumi Mizutani, 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation 72) Inventor Kiyoshi Kiyoshi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (56) References Showa 60-38638 (JP, U) Showa 60-80038 (JP, U) Showa Sho 61-31538 (JP, U)

Claims (1)

[Claims] 1. A step-changing lifting device provided with a traveling part and provided with a lifting part for detachably holding a heavy object and lifting and lowering the same, in an X- or Y-direction with respect to the upper frame. While holding a heavy object through an XY floating mechanism that is composed of an intermediate frame and a lower frame that are movable to an upper frame, and an XY lock cylinder that can fix the intermediate frame and the lower frame to the upper frame, A lifting and lowering device for changing the weight of a heavy object, wherein a guide hole or notch provided in the heavy object and a guide pin planted in an assembly target are fitted and guided to each other so that the heavy object is changed and assembled.