JPS6145993Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic press in which a column is fixed to a crosshead and a platen with a column nut.

This type of hydraulic press is often used horizontally, as shown in FIG. 1, and is mainly used for extrusion processing. The structure is hydraulic cylinder 1
The crosshead 2, which fixes the crosshead 2, and the platen 4, which receives the forward pressure of the ram 3, face each other and are connected by a plurality of columns 5. Each column 5 is connected to the crosshead 2 by a pair of inner and outer column nuts 6i, 6o.
This is a relatively simple device that is fixed to the platen 4. Although not shown, the hydraulic cylinder 1 is equipped with a high-pressure water supply device to move the ram 3 back and forth.

When assembling the above hydraulic press, in order to prevent the column nuts 6i and 6o from loosening during press operation,
This is done by first positioning the outer column nut 6o, then pulling the crosshead 2 and platen 4 apart to the outside with a pressure higher than the operating pressure, and tightening the inner column nut 6i in this state. However, when assembled in this way, the inner column nut 6i
A pressure greater than the operating pressure will be applied to the

In general, hydraulic presses require disassembly and repair every few years, but the inner column nut 6i, which has been subjected to intense pressure as described above, becomes extremely firmly attached to the column 5 due to rust and peeling, and the inner column nut 6i Even if the force applied to 6i is removed, it is difficult to remove it. Therefore, usually the inner column nut 6i
According to the fusing, the inner column nut 6
In addition to wasting i, there is a risk of damaging the threaded tooth surface of the column 5, and in the worst case, there is a problem that the column 5 may even need to be replaced.

In order to solve these problems, the hydraulic press of the present invention has an inner column nut 6i and a crosshead 2.
By interposing a consumable spacer for cutting and discarding it between the hydraulic press and the platen 4, and removing only this consumable spacer when disassembling the hydraulic press, it is easy to remove the inner column nut 6i without damaging the column 5 or the inner column nut 6i. It is distinctive in that it has been made to become familiar.

Hereinafter, the hydraulic press of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a side view showing the main parts of an example of a hydraulic press embodying the present invention, and shows a portion corresponding to section A in FIG. 1 on an enlarged scale.

A pair of column nuts 6i and 6o for fixing the platen 4 and the column 5 are both half-split type, and are two pieces joined together by a bolt 7. Platen 4 and inner column nut 6i
The consumable spacer 8 interposed between the column nuts 6i and 6o is also of a half-split type, and its outer diameter is the same as that of the column nuts 6i and 6o. This consumable spacer 8 has a protrusion 9 on the inside, and the protrusion 9 fits into a recess 10 formed on the outer surface of the inner column nut 6i, so that it is integrated with the inner column nut 6i.

The thickness of consumable spacer 8 is
When cutting the platen 4 and inner column nut 6.
It is sufficient that i has a size that does not cause thermal damage, specifically about 30 to 50 mm.

In addition, FIG. 3 shows a second embodiment of the present invention.
This figure corresponds to an example in which a so-called spherical washer is used as the consumable spacer 8. Due to the use of a spherical washer, the inner column nut 6i,
The joint surface 11 with the consumable spacer 8 is formed of a spherical surface.

The structure of the joint between the platen 4 and the column 5 has been described above, but the structure of the joint between the crosshead 2 and column 5 is also the same, with the consumable spacer 8 interposed between the crosshead 2 and the inner column nut 6i. Adopt a structure that

The method of assembling the hydraulic press of the present invention is as follows.

First, pass the column 5 through the crosshead 2 and platen 4, then attach the outer column nut 6o, and adjust the nut to tighten the crosshead 2.
and position the platen 4 at a predetermined location.

Next, the inner column nut 6i is temporarily attached to the column 5 with the consumable spacer 8 sandwiched therebetween. In this case, if the consumable spacer 8 is arranged to engage with the inner column nut 6i as shown in the example in FIG. 2, there is an advantage that the consumable spacer 8 can be installed simultaneously with the inner column nut 6i in an integrated state.

After temporarily attaching the inner column nut 6i, next
Apply water pressure higher than the operating pressure to the hydraulic cylinder 1,
With the crosshead 2 and platen 4 separated outwardly from each other, the inner column nut 6i is tightened, and finally the pressure in the hydraulic cylinder 1 is released.

For disassembly, apply the same water pressure to the hydraulic cylinder 1 as during assembly, and tighten the inner column nut 6i.
After removing the pressure applied to the consumable spacer 8, the consumable spacer 8 is cut off by gas cutting. After releasing the pressure from the hydraulic cylinder 1, the inner column nut 6i and the outer column nut 6o are removed, and the column 5 is pulled out.

In this case, when the consumable spacer 8 is removed,
There is a gap in this part, and the inner column nut 6i
Since the close contact between the crosshead 2 and the platen 4 is broken, and the force applied to the inner column nut 6i is completely removed, the inner column nut 6i
i can be easily removed.

As is clear from the above explanation, in the hydraulic press of the present invention, the inner column nut can be easily removed by simply cutting out the consumable spacer, which not only allows the inner column nut to be reused repeatedly, but also eliminates the risk of damaging the column. Since there is no need to disassemble the hydraulic press, it is possible to significantly reduce the cost required for disassembling the hydraulic press.

Furthermore, if the consumable spacer is integrated with the inner column nut as shown in the example in Figure 2, the complexity of the assembly work due to the interposition of the consumable spacer can be avoided, and the assembly work can be completed with the same number of steps as a conventional hydraulic press. It can be easily assembled.

In addition, in the type of hydraulic press to which this invention is applied, it is difficult to make the column completely orthogonal to the crosshead and platen, and there is a risk of bending the column during operation, which may cause bending moment and breakage of the column. When a spherical washer is used as a consumable spacer as in the example, this bending moment is removed, and the effect of preventing column breakage can also be obtained.

[Brief explanation of drawings]

Figure 1 is a side view showing the basic structure of a hydraulic press to which the present invention is applied, and Figures 2 and 3 are side views illustrating the main structure of a hydraulic press to which the present invention is applied. It is an enlarged view of part A. In the figure, 1...hydraulic cylinder, 2...crosshead, 3...ram, 4...platen, 5...column, 6i...inner column nut, 6o...outer column nut, 8...consumable spacer.

Claims (1)

[Scope of utility model registration request] Crosshead 2 that fixes the hydraulic cylinder 1
and a platen 4, which is located in front of the hydraulic cylinder 1 and receives the forward pressure of the ram 3, are connected by a plurality of columns 5, and the columns 5, the crosshead 2, and the platen 4 are each connected to a set of inner and outer column nuts. In the hydraulic press connected at 6i and 6o, a consumable spacer 8 for cutting is interposed between the inner column nut 6i and the crosshead 2 and platen 4, and the hydraulic press A hydraulic press characterized in that the inner column nut 6i can be easily removed by cutting off the consumable spacer 8 during disassembly.