JPS624341Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a die lifter for loading and unloading molds onto and from the bolster of a press machine.
For example, as shown in FIG. 1 to FIG.
The present invention relates to a die lifter 6 which is rotatably supported by a die lifter 6 and has a structure in which the support surface (upper surface) of a conveyance roller 11 is projected higher than the upper surface of a lift frame 8.

The die lifter 6 having this structure is inserted into the T-groove 7 on the upper surface of the bolster 2 of the press machine 1, and the die lifter 6 is inserted into the T-groove 7 on the upper surface of the bolster 2 of the press machine 1. After the plate 3 is placed on the conveying roller 11 and carried onto the bolster 2, the die plate 3 is fixed on the bolster 2 with the clamp 4 while the conveying roller 11 is sunk into the T-groove 7. used.

(Conventional example) As a device for driving the lift frame 8 up and down in order to float and sink the conveyance roller 11 into the T-groove 7, various devices described below are conventionally known.

Japanese Utility Model Publication No. 46-62782 describes a lift frame in which the lift frame is driven up and down by a hydraulic cylinder, and the hydraulic cylinder is buried under the bottom of the T-groove, but it has the following drawbacks.

(b) A hydraulic cylinder and a hydraulic device for supplying pressure oil to the hydraulic cylinder are required, and the lifting device for the lift frame becomes large-scale.

(b) It is necessary to additionally construct a hole for embedding a hydraulic cylinder and a pressure oil passage in a large and heavy bolster.
The processing takes time and effort, making it difficult to implement.

Japanese Utility Model Publication No. 53-8039 describes a device in which the rear end of the lift frame is supported from below by a receiving arm and the front end of the lift frame is pushed up by a circumferential cam, but it has the following drawbacks.

C. In order to sufficiently float and sink the conveyance roller at the rear end into the T-groove, the receiving arm at the rear end of the lift frame must protrude for a long time outside the rear end of the bolster, which becomes a hindrance.

After carrying the die plate onto the bolster,
While the front end of the lift frame is lowered by the circumferential cam and the transport roller is lowered into the T-groove, the lift frame gradually tilts forward and downward, and the die plate begins to shift forward and downward on the transport roller.

For this reason, the die plate cannot be placed on the proper fixed position on the bolster. Moreover, it is also dangerous.

E. Because the span between the two points of support at the front and rear ends of the lift frame is very long, the lift frame must be large and have high bending strength. Moreover, the large lift frame does not fit into the existing T-groove, and it is necessary to additionally construct a housing groove for the large lift frame in the large and heavy die lifter, which takes a lot of effort.

In Japanese Utility Model Application Publication No. 51-147147, vertical holes are recessed at appropriate intervals in the front-rear direction on the upper surface of the bolster, and a disc spring and a ball bearing are inserted into each vertical hole in order, and the disc spring moves the ball bearing onto the vertical hole. It is described that when the die plate is supported by being levitated to the surface and the die plate is pushed down and fixed onto the upper surface of the bolster with a clamp, the disc spring is pushed down into the vertical hole by the force of the clamp. There is.

This disk spring can be used in the hydraulic cylinder described in the above-mentioned Utility Model Publication No. 1982-62782 or in the above-mentioned Utility Model Publication No. 53-8039.
By replacing the receiving arm and circumferential cam in the publication, it is conceivable to push up the lift frame under the conveyance roller with a disc spring.

In this case, although the above-mentioned drawbacks A to E can be eliminated, the following drawbacks occur.

F. It is necessary to transfer the large and heavy bolster from the press machine to the machine tool and make an additional hole for installing the disc spring in the bottom of the T-groove of the bolster, which takes time and takes time to attach and remove the bolster, transport it, and drill the hole. It takes time and effort. This increases the cost of additional machining, and
During this time, the press machine cannot be used.

During distribution and storage of die lifters, disc springs are easily lost because they are located far from the lift frame and there are many of them.

Furthermore, during field work, an extra disc spring must be installed in the T-groove in addition to the lift frame, and many disc springs must be stacked one on top of the other, making assembly and removal time-consuming and inefficient. be.

Furthermore, field work is not as orderly as factory work, so when stacking a large number of Belleville springs, they may be turned upside down or the number may be incorrectly placed. The heights of each set of disc springs that are placed side by side in the rack are out of alignment with each other.

As a result, the lift frame becomes slanted, making it difficult to transport the die plate or preventing it from being placed in the correct position on the bolster.

Furthermore, in places where the lift frame is low, the die plate gets stuck on the top surface of the bolster, making it impossible to transport or damaging the die plate, and in places where the lift frame is high, the die plate floats in a clamped state from the top surface of the bolster.

If the hole for installing the disc spring cannot be made deep enough due to the thickness of the revolver, the hole must be drilled on the underside of the lift frame to compensate for the insufficient depth.

In this case, since the disc spring is located directly below the conveyance roller, the space in which the conveyance roller is accommodated is raised and lowered by the size of the hole, and only a small diameter conveyance roller can be used. As a result, vibrations occur during conveyance of the mold, the surface pressure increases and the lower surface of the mold is damaged, the conveyance roller is damaged or cracked, and conveyance performance and durability deteriorate.

(The present invention) The purpose of the present invention is to eliminate all of the above-mentioned drawbacks (I) to (I), and furthermore, to increase the maximum conveyance weight of the mold and to enable it to be conveyed stably and smoothly. do.

In order to achieve the above object, the present invention incorporates a pair of lift springs 10, 10 arranged in front and behind the conveyance roller 11 in the lift frame 8, as shown in FIGS. 2 to 7, for example. It is.

That is, a pair of front and rear lift springs 10, 10 are attached to each conveyance roller 11, and the pair of front and rear lift springs 10, 10 are arranged on the front side and the rear side of the conveyance roller 11 inside the lift frame 8.

The upper ends of each pair of front and rear lift springs 10 are received by respective spring receiving seats 14, and the lower ends thereof are respectively received by respective spring receiving washers 15. Each spring seat 14 is fixed to an upper portion inside the lift frame 8.

Each spring receiving washer 15 is inserted into a lower part inside the lift frame 8 so as to be able to rise and fall freely, and is received by a retaining part 18 fixed to the lower part of the lift frame 8. From each spring catch washer 15.15 to each leg 20.
20 protrudes downward.

Next, its effect will be explained.

When the clamp 4 is loosened on the bolster 2, the die plate is released from the clamp 4 and is lifted onto the upper surface of the bolster 2 by the tension of the lift spring 10 via the lift frame 8 and the conveyance roller 11.
In this state, the die plate 3 can be easily carried in and out on the conveyance rollers 11.

When the newly brought in die plate 3 is pressed against the upper surface of the bolster 2 with the clamp 4 and fixed, the lift spring 10 is compressed by the clamping force.
The conveyance roller 11 and the lift frame 8 are pushed down into the T-groove 7.

Since the present invention is configured and operates as described above, it has the following effects.

A Lift springs 10 and 10 are installed in the lift frame 8 as a means for floating and lowering the conveyance roller in the T groove 7.
All you have to do is incorporate the .

This eliminates the need for the hydraulic cylinder and the hydraulic system for supplying pressure oil to it, as described in the above-mentioned Japanese Utility Model Publication No. 46-62782, and eliminates the above-mentioned drawbacks (i. difficulties) can be resolved.

In addition, the receiving arm and circumferential cam of the above-mentioned Japanese Utility Model Publication No. 53-8039 are omitted, and the above-mentioned defects C (protrusion of the receiving arm rearward from the bolster), D (starting of movement when placed on the die plate bolster), and H (long length) are eliminated. At the same time, the problem of increasing the size of the lift frame due to two-point support on the span can also be solved.

B. Since the lift springs 10 and 10 are incorporated and supported at locations shifted forward and backward from the conveyance roller 11 within the lift frame 8, Utility Model Application No. 51-147147
The above-mentioned disadvantages of installing the disc spring between the bolster and the lift frame of the publication, inefficiency),
Chi (height discrepancy caused by inserting the disc spring incorrectly),
and (Improved conveyance performance by reducing the diameter of the conveyance roller.
deterioration of durability).

C. For the lift springs 10, 10, large springs that are close to the total height of the lift frame 8 can be used, and two of these large springs are used for each transport roller, so the maximum transport weight of the mold can be greatly increased. Die lifters can be made smaller and have higher capacity.

Moreover, since each conveyance roller 11 is supported from both front and rear sides by a pair of lift springs 10,
It is supported stably and the mold can be transported stably and smoothly.

Furthermore, since the support span of each conveyance roller 11 by the pair of lift springs 10, 10 is very short, the lift frame 8 becomes sturdy with excellent bending strength. It can be transported stably and smoothly.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a press machine 1 on which a die plate 3 is placed on a bolster 2 and a clamper 4.
It is fixed at The die plate 3 is the clamper 4
With the fixation of the
Movement on the bolster 2 during loading and unloading is performed by a die lifter 6.

The die lifter 6 is attached to the existing T groove 7 in the bolster 2.
When the die plate 3 is fixed, the T
It sinks into the groove 7, and when the die plate 3 is loaded or unloaded, the T
It floats slightly above the groove 7 to support and move the die plate 3, and has the structure shown in FIGS. 2 to 7.

Reference numeral 8 denotes a lift frame, which is formed by bending an iron plate into a gate-shaped cross section to form a long rod shape in the front and back, and width regulating plates 9 are mounted between the left and right side walls at each end of the front and back.
Inside the lift frame 8, two pairs (four) of coil-type lift springs 10 and two conveyance rollers 11 are arranged in front and behind each other, and each pair of lift springs 10 is located in front and behind each roller 11.

Each roller 11 is made of a ball bearing or a roller bearing, and is rotatably supported on the lift frame 8 by a horizontal shaft 12. Lift frame 8 above roller 11
A roller protruding hole 13 is formed in the upper wall, and the supporting surface (upper surface) of the roller 11 protrudes from the roller protruding hole 13 onto the upper surface of the lift frame 8.

Each lift spring 10 is inserted between a spring seat 14 formed on the upper wall of the lift frame 8 and a spring seat washer 15 disposed at the lower part of the lift frame 8 so as to be movable up and down. A pair of left and right lifting guide holes 16 are provided in the lower half of both left and right walls of the lift frame 8 on the left and right sides of the spring receiver washer 15.
is opened, and a pair of locking pawls 17 formed on the left and right sides of the spring receiver washer 15 are loosely fitted into the guide hole 16, and the locking pawls 17 are pushed down by the spring 10, and the guide hole 16 is opened.
It is received by a retaining portion 18 formed on the bottom surface of the body, and is prevented from being pulled out downward.

A slightly elastically deformable tapered female threaded cylinder 19 is formed in the center of the spring receiving washer 15, and a hexagon head bolt leg 20 is screwed into this from below. This leg 20 has a leg screw 21 and a tapered female screw tube 19.
The height can be adjusted by a height adjustment mechanism 22 consisting of a
It is fixed at that height position by elastically tightening.

A plurality of mounting screw holes 23 for increasing the width of the lift frame 8 are provided on both left and right sides of the lift frame 8 in the front and rear. As shown in FIG. 8, when the width of the T-groove 7 of the bolster 2 is large and the lift frame 8 shakes left and right too much, a width expanding plate 24 is installed on the outer surface of at least one of the left and right side walls of the lift frame 8. 2, and fasten it into the mounting screw hole 23 with a countersunk screw 25. As a result, the pushing width of the lift frame 8 is expanded, and the lift frame 8 is prevented from rattling from side to side within the T-groove 7.

A plurality of die lifters 6 configured as described above are arranged one behind the other according to the length of the T-groove, and are connected by bolts 26 at the width regulating plate 9. In this case, the total length of the die lifter 6 is 200 mm, and the roller 11
The pitch between them is 100mm. In addition, a die lifter 6 with the same structure as this die lifter 6 but with three rollers 11 and a total length of 300 mm is made separately, and by appropriately combining 200 mm and 300 mm die lifters 6, the total length can be adjusted in 100 mm increments. It can be extended with

Next, its effect will be explained.

That is, when carrying in and out of the die plate 3, the roller 11 is pushed up together with the lift frame 8 by the lift spring 10, and the supporting surface of the roller 11 floats above the upper surface of the bolster 2, supporting the die plate 3 so that it can be carried in and out. Further, when the die plate 3 is pressed onto the bolster 2 by the clamper 4, the roller 11 and the lift frame 8 are pushed down together with the die plate 3 into the T groove 7 against the lift spring 10 due to the pressing force, and the die plate 3 is fixed. Clamper 4
When the rollers 11 are loosened, the force of the lift springs 10 causes the rollers 11 to lift the die plate 3 again so that it can be freely conveyed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the device in use, FIG. 2 is a plan view of the main part of FIG. 1, and FIG.
The figure is a longitudinal side view of Fig. 2, Fig. 4 is a longitudinal sectional side view of the main part of Fig. 3, Figs. 5 and 6 are longitudinal sectional front views of the main part of Fig. 4, and Fig. 7 is a longitudinal sectional side view of the main part of Fig. 6. The cross-sectional plan view, FIG. 8, is a diagram corresponding to FIG. 6 according to another embodiment. 8... Lift frame, 10.10... Lift spring,
11...Conveyance roller, 12...Horizontal axis, 14.14
...Spring catch washer, 15.15...Spring catch washer, 1
8, 18... Retention part, 20, 20... Leg (bolt).

Claims (1)

[Scope of utility model registration request] Conveying rollers 11 are installed inside the lift frame 8 which is long in the front and rear.
is rotatably supported on a horizontal shaft 12, and conveyor rollers 11
In a die lifter for a press machine, in which the supporting surface of the lift frame 8 is projected higher than the upper surface of the lift frame 8, a pair of front and rear lift springs 1 are provided for each conveyance roller 11.
0.10 is attached, and a pair of front and rear lift springs 10.
Reference numeral 10 indicates a pair of lift springs 1 disposed inside the lift frame 8 on the front side and the rear side of the conveyance roller 11.
The length ends of 0 and 10 are received by the spring receivers 14 and the lower ends thereof are received by the spring receivers 15 and 15, respectively. The spring receiver washers 15, 15 are inserted into the lower part of the inside of the lift frame 8 so as to be able to rise and fall freely, and are received by the retaining parts 18, 18 which are fixed at the lower part of the lift frame 8. Each spring retainer washer 15.
A die lifter for a press machine, characterized in that legs 20, 20 protrude downward from 15.