JP2745111B2 - Hydraulic press device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press and, more particularly, to a hydraulic press having an improved structure for mounting a prefill valve.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional hydraulic press. In the figure, 1 is an upper frame, 2 is a lower frame, 3 is a cylinder tube, 4 is a piston rod, 5 is a ram, 6 is a bolster, and a mold mounting portion 7 is between the ram 5 and the bolster 6. The prefill valve 8 is provided at the top of the cylinder tube 3 attached to the upper frame 1,
It is connected to a sub-tank (not shown) via a flange 9 and a tube 10. The prefill valve 8 includes a flange 9
In order to receive the maximum pressure generated in the cylinder tube 3 by the mounting bolts 11 simply by being sandwiched between the cylinder tubes 3, a large number of powerful bolts are used so that the pressure receiving area is as large as possible.

[0003] In this device, the ram 5
Is slid by its own weight, but is guided in the vertical direction by the tie rod nut 12, and its movement is regulated by the piston rod 4, so that the ram 5 descends while maintaining the horizontal position. In this case, instead of the oil from the hydraulic pump (not shown) flows into the liquid chamber of the cylinder tube 3, prefill valve 8 is opened by a negative pressure generated in the cylinder tube 3, accumulated in the sub-tank (not shown) Oil from the tube 10 through the flange 9 and through the prefill valve 8
From the cylinder tube 3.

Although the position of the sub-tank is not shown, oil does not flow unless the height difference between the sub-tank and the end surface of the piston in the cylinder tube 3 is increased. However, the pressure difference generated by the height difference is small, and pressure loss in the piping which can be usually ignored also becomes a problem. If the pipe line resistance of the tube 10 is large, oil does not flow even if the height difference is considerably large.

[0005]

As described above, in the conventional hydraulic press, if the prefill valve is used, the oil cannot be flowed into the cylinder tube without difficulty unless the sub-tank is arranged at a high place. For this reason, the device becomes tall, or the hydraulic unit itself is arranged at the upper part of the device without separately providing a sub tank. In a large press, it is common to provide a hydraulic unit at the upper part of the apparatus, but there is a problem that maintenance is poor, and there is a drawback that a small press apparatus cannot be used.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has as its object to provide a hydraulic press apparatus having a prefill valve mounting structure which can be easily adopted even in a small press.

[0007]

In order to achieve the above object, a hydraulic press apparatus according to the present invention has a pre-fill valve disposed at a position above a hydraulic cylinder of a frame, and the frame and the hydraulic press are provided. attached by interposing the prefill valve between the pressure cylinder and the hydraulic cylinder is fixed to said frame, said Purefu
A part of the frame located above the filter valve is configured as a tank for liquid supply and storage.

The hydraulic press device according to the present invention comprises a frame
Prefiller at the lower part of the hydraulic cylinder
And a cylinder between the frame and the hydraulic cylinder.
Installed with the prefill valve interposed, and
While fixing the hydraulic cylinder to the above frame,
Part of the frame and below the pre-fill valve
And the part connected to the part
The side part of the mounting position of the fill valve and the upper part
The part is configured as a tank for liquid supply and storage.
It is.

[0009] The hydraulic press device according to the present invention may be configured such that a recess is provided on the frame side of the piston, and the prefill valve is disposed in the recess.

[0010] The hydraulic press device according to the present invention may be configured such that a seal plate and an O-ring are inserted into the recess.

Further hydraulic press apparatus according to the present invention, have use a hydraulic cylinder having in the internal piston and along the fast forward cylinder the central axis, the site located on the central axis of the hydraulic cylinder of the frame Attach the hydraulic cylinder and raise the prefill valve.
At a position deviated from the central axis of the hydraulic cylinder, a liquid inflow / outflow passage provided in the piston is attached to the opening on the frame side , and the prefill valve and the liquid supply provided in a part of the frame are provided. - between the tank for storing can be formed by connecting constituted by pipe bends at appropriate angles a.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic press according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a first embodiment of a hydraulic press device according to the present invention, and FIG. 2 is an enlarged center sectional view of the same. In the figure, reference numeral 20 denotes a frame, 21 denotes a piston, 22 denotes a ram / cylinder tube, and the piston 21 attached to the frame 20 serves as a fixed side, and the ram / cylinder whose movement direction is regulated in the vertical direction by a guide 23 attached to the frame 20. The tube 22 is on the movable side, and the die is set in the die mounting portion 24 to perform the press working.

[0013] prefill valve 25 are then sandwiched by fixed between the site located on the center axis of the piston 21 of the piston 21 and the frame 20. Part position of the upper side of the prefill valve 25 of the frame 20 is a sub-tank 26. The piston 21 is fixed to the frame 20 by bolts 27.
Is fixed to the overhanging portion 28 of the main body. That is, the structure is such that the bolt for attaching the piston 21 or the ram / cylinder tube 22 to the frame does not interfere with the portion serving as the sub-tank 26, and the number of bolts is greatly reduced. There is no hindrance. The frame overhang portion 28 is provided at a position where it does not interfere with the pilot pressure pipe 29 of the prefill valve 25 which emerges in the lateral direction.

The prefill valve 25 is provided so as to block an inflow / outflow path 31 of the pressurized oil to / from the pressurizing liquid chamber 30 between the piston 21 and the ram / cylinder tube 22, and performs an opening / closing operation when necessary. When the prefill valve 25 is opened, the sub-tank 26 and the pressurizing liquid chamber 30 are directly connected without using a tube as in the related art, and the problem caused by the pressure loss in the piping is eliminated. The oil level 32 moves up and down. At this time, if the amount of oil in the sub-tank 26 is too large, it is adjusted by a pipe 33 to a tank (not shown), and the amount of air in the sub-tank 26 is adjusted by an air breather 34. In addition, 35 shown in FIG. 2 is a sealing material.

FIG. 3 shows a second embodiment of the hydraulic press apparatus according to the present invention.
It is a center sectional view of an example. In the first embodiment, the hydraulic pressure generated in the pressurizing liquid chamber 30 is directly received by the lower surface of the prefill valve 25. However, this structure is improved, and the pressure is held by the flange 9 in the conventional apparatus shown in FIG. The sealing material 35 is pressed with the same uniform force as the
Those who lost the possibility of oil leakage due to differences in the deformation of the 1 and the frame 20. Specifically, the prefill valve 2
In order to ensure the sealing performance of the piston 5, a concave portion 36 is formed on the top surface of the piston 21 by spot facing, and the prefill valve 25 is formed.
An O-ring 37 is attached to the side surface of the cylinder for sealing, so that even if deformation occurs, there is no problem in sealing performance. Note that other configurations and operations are the same as those of the first embodiment, and thus description thereof is omitted.

FIG. 4 shows a third embodiment of the hydraulic press apparatus according to the present invention.
It is a center sectional view of an example. This embodiment is substantially the same as the second embodiment, except that a disc-shaped seal plate 39 having an O-ring 38 mounted on the outer periphery is placed in the concave portion 36.
A prefill valve 25 is mounted thereon. Even in this structure, the sealing is performed on the side surface of the cylinder, so that it is possible to cope with deformation. In addition, variations in the height of the prefill valve 25 and the dimensions of the projecting portion 28 of the frame can be adjusted by the thickness of the seal plate 39. Other configurations in the present embodiment,
The operation is the same as in the first embodiment, and a description thereof will be omitted.

FIG. 5 shows a fourth embodiment of the hydraulic press apparatus according to the present invention.
FIG. 6 is a front sectional view of the embodiment, and FIG. In this example, a piston 21a and a ram / cylinder tube 22a are arranged below the frame 20.
Has a built-in fast-forward cylinder 40 along the central axis. It should be noted that such arrangements can be made in each of the above embodiments, and also in this fourth embodiment, the arrangement can be made upside down. Prefill valve 25 for both upper and lower sides
The hydraulic cylinder equipped with a cylinder may be used facing the cylinder. Further, reference numeral 41 in FIG. 6 denotes a pipe for the fast-forward cylinder 40.

However, in the arrangement of this embodiment, the sub tank 2
6a and the lower side of the prefill valve 25
And the upper and lower sides are formed in an L-shape so that the oil level 32 is
The height difference is set by setting it to be higher than a. The prefill valve 25 is mounted directly on the side surface of the frame 20 at a position deviated from the center axis of the piston 21a and the ram / cylinder tube 22a, instead of piping with a tube or the like.
2 is connected to the sub-tank 26a and the inflow / outflow path 43 of the pressure oil to / from the piston 21a. In the present embodiment, the other configurations and operations are the same as those of the first embodiment, and a description thereof will be omitted.

[0019] Note that above in each of the embodiments has been described are arranged prefill valve on a central axis of the hydraulic cylinder, but in the present invention located above hand side of the hydraulic cylinder frame prefill valve The arrangement is not limited to the arrangement in the illustrated embodiment.

[0020]

As described above, in the hydraulic press apparatus according to the present invention, a prefill valve is installed between a piston or a cylinder tube and a frame, and a part of the frame is used as a tank for pressurized oil. As a result, the structure becomes simpler than before, the unit price and installation cost can be reduced, and by using a tank as a part of the frame,
There is no need to provide a separate sub-tank as in the conventional case, which leads to a significant cost reduction.
Also, increased heat radiation area by a tank a portion of the frame, there is also an effect that it is possible to suppress an increase in oil temperature.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of a hydraulic press device according to the present invention.

FIG. 2 is a central enlarged sectional view of a main part of the embodiment of FIG. 1;

FIG. 3 is a central enlarged sectional view of a main part of a second embodiment of the hydraulic press device according to the present invention.

FIG. 4 is a central enlarged sectional view of a main part of a third embodiment of the hydraulic press device according to the present invention.

FIG. 5 is a front view of a fourth embodiment of the hydraulic press device according to the present invention.

FIG. 6 is a central enlarged sectional view of a main part of the embodiment of FIG. 5;

FIG. 7 is a front view of a conventional hydraulic press device.

[Explanation of symbols]

 Reference Signs List 20 frame 21, 21a piston 22, 22a ram / cylinder tube 23 guide 24 mold mounting part 25 prefill valve 26, 26a sub tank 27 bolt 28 frame overhang part 29 prefill valve pilot pressure pipe 30 pressurized liquid chamber 31, 43 Inlet / outlet path of pressurized oil 32 Oil level of sub tank 33 Piping 34 Air breather 35 Sealing material 36 Recess 37, 38 O-ring 39 Seal plate 40 Rapid feed cylinder 41 Piping for fast feed cylinder 42 Block

Claims (5)

(57) [Claims] 1. A arranged prefill valve site located at the top of the hydraulic cylinder of the frame, attached by interposing the prefill valve between said frame and said hydraulic cylinder, and the hydraulic cylinder Fix to the frame and place it above the prefill valve.
A hydraulic press device in which a part of the frame to be placed is used as a tank for liquid supply and storage. 2. A position below the hydraulic cylinder of the frame.
Place a prefill valve at the part
The prefill valve is interposed between the hydraulic cylinders.
And attach the hydraulic cylinder to the frame
And a part of the frame,
The part located below the prefill valve and the part
As well as the mounting position of the prefill valve
Tanks for liquid supply and storage at the side and upper part
Hydraulic press equipment. Wherein a recess is provided on the frame side of the piston, hydraulic press apparatus according to claim 1 or 2, characterized in that arranging the prefill valve recess. 4. The hydraulic press according to claim 3, wherein a seal plate and an O-ring are inserted into the recess. 5. A piston inside and along the fast forward cylinder the central axis have use a hydraulic cylinder having associated, the fluid pressure site located on the central axis of the hydraulic cylinder of the frame <br/> over arm It is attached to the cylinder, the pre
The fill valve, the deflection of the liquid inflow Detchi provided on the piston at a position shifted from the center axis of the hydraulic cylinder
Attached to the opening of the over arm side, to become connected by a pipe to bent at appropriate angles between the tank for the liquid supply and storage provided in a part of the pre-filled valves and the frame
The hydraulic press according to any one of claims 1 to 4, wherein: