JP2598629Y2 - Pressurizing 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 pressurizing device used for a pressurized vulcanization molding device for rubber.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a first piston b for pressing a pressure member, a cylinder a for mounting the first piston b, and a first pressure chamber c formed in the cylinder a.
Second pressure chamber d in the first piston b having a smaller volume than
And a second piston e mounted on the first pressure chamber c. First, a pressure such as a hydraulic pressure is applied to the first pressure chamber c to quickly move the pressurizing member to a position just before a desired position. 2. Description of the Related Art There is known a pressurizing device that applies pressure to a first pressure chamber c in a cylinder a having a larger volume than a chamber c and slowly moves a pressurizing member to pressurize the first pressure chamber c.

[0003]

However, since the second piston e is fixed to the side of the cylinder a when the second piston e is fixed to the cylinder a, the cylinder a, the first piston b, and the second piston d are not assembled. It is necessary to perform the centering at the same time. If the centering is difficult and the centering is insufficient, the cylinder a and the first piston b or the second first piston b and the second
There are problems such as galling and oil leakage between the piston e and the press accuracy being reduced.

An object of the present invention is to provide a pressurizing device free of such a problem.

[0005]

According to the present invention, a first piston for pressing a pressing member, a cylinder on which the first piston is mounted, and a first piston formed in the cylinder are provided. A second piston mounted in a second pressure chamber in the first piston having a smaller volume than the pressure chamber, and the first piston is quickly supplied by supplying pressure to the first pressure chamber following the second pressure chamber. In a pressurizing device for performing a movement and a subsequent slow movement, the second piston is slidably supported on an inner wall of a second pressure chamber, and a rear end of the second piston is moved from the second pressure chamber to the first pressure chamber. A receiving seat that protrudes into the pressure chamber and receives the protruding end of the second piston is provided on the cylinder wall.

[0006]

In the pressurizing apparatus having the above structure, the cylinder is aligned with the first piston, and the first piston and the second piston are aligned.
It is only necessary to perform centering with the piston individually, and the assembling work is simplified as compared with the conventional three-way centering.

[0007] Moreover, the number of locations where hydraulic pressure leaks to the outside is reduced, and the danger of hydraulic pressure leaking is reduced accordingly.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, 1 is a cylinder having a bottom, 2 is a first piston mounted in the cylinder 1, and 4 is a second piston in the first piston 2 having a smaller volume than the first pressure chamber 3 formed in the cylinder 1. The pressure chamber 5 is a slidably provided second piston supported on the inner wall 4a of the second pressure chamber 4, and the rear end of the second piston 5 is connected to the first pressure chamber 3 by the second pressure chamber 4. And the protruding end 5 of the second piston 5 is provided on the inner wall 1a of the cylinder 1.
The receiving seat 6 for receiving a is provided.

This will be further described below.
Is provided with a second pressure chamber 4 which is long in the vertical direction and is provided inside thereof along the longitudinal direction, and includes a packing 7 provided on a lower outer periphery of the first piston 2 and a packing 8 provided on an upper outer periphery 1 of the cylinder 1. And slidably mounted in the vertical direction of the cylinder 1. Then, a plug 2b attached to an opening provided at a lower portion of the first piston 2 is attached, and a second piston 5 is mounted in the second pressure chamber 4 by passing through a through hole 2c provided in the stopper 2b. The second piston 5 is slidably supported by the peripheral wall of the hole 2c.

The receiving seat 6 is formed on the upper surface of the lower inner wall 1a of the cylinder 1 by bulging upward.

Reference numeral 9 denotes a packing provided on the peripheral wall of the through hole 2c, and reference numeral 10 denotes a pressing member provided at an upper end of the first piston 2 facing a pressure receiving member (not shown).

Next, the operation of the present apparatus will be described with reference to FIG.

In order to move the pressurizing member 9 upward, the solenoid x of the switching valve A with both solenoids is excited, and the hydraulic supply path r ₁ connected to the second pressure chamber 4 is connected to the hydraulic pump P.
Then, since the lower end of the second piston 5 comes into contact with the receiving seat 6,
As shown in FIG. 3, the pressure member 10 is pushed up at a relatively high speed by being pushed by the hydraulic pressure acting on the upper wall of the second pressure chamber 4 having a relatively small volume.

[0014] Then where pressure member 10 is moved to just before the desired position, thereby energizing the solenoid z bifurcated hydraulic path r ₂ pieces Solenoid with switching valve is interposed B from the hydraulic path r _1. Then, hydraulic pressure is also applied to the lower chamber 3a of the first piston 2 of the first pressure chamber 3 having a relatively large volume. Therefore, as shown in FIG. 3, the first piston 2 pushes up the pressing member 10 at a relatively slow speed as shown in FIG.

If the oil pressure is continuously applied while the pressure member 10 is in contact with the pressure receiving member, the pressing force of the pressure member 10 sharply increases. When the excitation of both solenoids y and z is released in this state, the switching valves A and B with both solenoids are switched to the neutral position and the pressurized state by the pressurizing member 10 is maintained.

In order to lower the pressurizing member 9, the solenoid z of the switching valve B with one solenoid and the solenoid y of the switching valve A with both solenoids are excited, and the first pressure in the first pressure chamber 3 is increased.
The hydraulic path r ₃ connected to the upper chamber 3 b of the piston 2 is connected to the hydraulic pump P, and the hydraulic paths r ₁ and r ₂ are connected to the tank T. At this time, the first piston 2 moves down quickly as shown in FIG.

Reference numeral 11 denotes a check valve interposed in the hydraulic path r ₁ , 12 denotes a safety valve connected to the second pressure chamber 4, 13 denotes a pressure of the lower chamber 3 a of the first piston 2 of the first pressure chamber 3. 2 shows a pilot check valve for adjusting the pressure.

[0018]

The present invention having the above-described structure has the following effects.

It is only necessary to perform centering of the cylinder and the first piston and centering of the first piston and the second piston individually.
Assembling work is simpler than that in which three pistons must be aligned at the same time, and there are fewer locations where hydraulic pressure leaks to the outside, which reduces the risk of hydraulic pressure leaking. And a pressurizing device with a high pressure can be obtained.

[Brief description of the drawings]

FIG. 1 is a cutaway side view showing an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of FIG.

FIG. 3 is a diagram showing operating characteristics.

FIG. 4 is a sectional side view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder 2 1st piston 3
1st pressure chamber 4 2nd pressure chamber 5 2nd piston 6
Seat

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ identification code FI B29K 105: 24 (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 43/00-43/58 B29C 35/00 -35/18 B30B 1/00-1/42 F15B 15/00-15/28

Claims (1)

(57) [Scope of request for utility model registration] 1. A first piston for pressing a pressure member, a cylinder for mounting the first piston, and a second pressure in the first piston having a smaller volume than a first pressure chamber formed in the cylinder. A second piston mounted in the chamber;
In a pressurizing device for supplying a pressure to a first pressure chamber following a pressure chamber to perform a quick movement and a subsequent slow movement of the first piston, the second piston is slidable on the inner wall of the second pressure chamber. And a rear end of the second piston protruding from the second pressure chamber into the first pressure chamber, and a cylinder wall having a receiving seat for receiving a protruding end of the second piston.