JPH0335532Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a membrane structure that seals a vertically moving mold to form an airtight chamber in a mold floating type vacuum brick molding machine. It is something.

[Prior art]

The general structure of a mold floating type vacuum brick molding machine is described in, for example, Japanese Patent Laid-Open No. 59-68205, and as shown in FIG. 2 is attached, and an upper airtight cylinder 3 is arranged on the outside thereof. Furthermore, a skirt 4 and an upper airtight flange 5 surround the outside of this airtight cylinder 3, and an upper airtight chamber 3a
The flange 5 is moved up and down by an airtight chamber drive cylinder 5a. A flexible intake hose 3b is attached to this airtight chamber 3a.
are in communication with each other to reduce the pressure in the airtight chamber 3a.

On the other hand, a mold holder 7a is attached to the lower mold support frame 7, and the holder 7a is attached to the mold 6.
supporting the A lower punch 11 mounted on a fixed base 12 is inserted into the mold 6, and a lower airtight cylinder 8 is attached to the lower surface of the mold 6 so as to surround the punch 11. A lower airtight flange 10 is placed on a fixed base 12 below this lower airtight cylinder 8, and a lower airtight chamber 8 is formed by a lower skirt 9 provided between the lower airtight flange 10 and the lower airtight cylinder 8.
a is formed. And this lower airtight chamber 8a
A flexible intake hose 8b is connected to the airtight chamber 8a to reduce the pressure inside the airtight chamber 8a.

A piston cylinder 13 is provided between the lower fixing base 12 and the mold support frame 7 to move the mold support frame 7 up and down. A table 16 is placed on the upper surface of this support frame 7, and a raw material charger 14 placed on this table 16 is slid by a piston cylinder 17. The raw material tank 15 of the charger 14 is filled with brick raw material S,
When the charger 14 is slid onto the upper part of the mold 11, the raw material is filled into the mold.

In this vacuum brick molding machine, after filling the mold with brick material, the upper punch 2 is pressed down to compression mold the raw material in the mold. At the same time, the piston cylinder 5a is operated to bring the upper airtight flange 5 into close contact with the table 16 to form an airtight chamber.
By reducing the pressure, the air and gas sucked out of the brick material are extracted to improve molding efficiency.

At the same time, the pressure inside the lower airtight chamber 8a is also reduced to improve molding efficiency. After brick molding, the entire mold support frame 7 is lowered by the operation of the piston cylinder 13, and the bricks remaining on the mold 11 are taken out.

In this way, the mold floating type vacuum brick molding machine has the effect of uniformly molding the upper and lower parts of the molded product due to the mold floating effect, but on the other hand, the upper and lower airtight chambers are expanded and contracted. There is a need.

In the conventional example shown in the figure, a skirt tapered in an arc shape is used for the expandable portion of the airtight chamber. This skirt is made of a soft material such as rubber that can withstand expansion and contraction, but it needs to be structured so that it does not deform excessively due to the pressure difference with the outside air when the airtight chamber is depressurized. In conventional brick molding, the molding thickness was about 150 mm, so this type of skirt was sufficient, but in recent models, the molding thickness has increased.
400mm to 600mm is now required. In such models, the stroke of the plunger is long, and the expansion and contraction stroke of the airtight chamber is also long, making it impossible for conventional soft skirts to handle this.

On the other hand, Japanese Patent Application Laid-open No. 48-44307 discloses a vacuum brick forming machine equipped with a bellows, but the bellows deforms inward due to the pressure difference between the inside and outside of the bellows, making it impossible to restore the shape. Furthermore, if a thick rubber or metal membrane is used to increase strength, the length when contracted becomes longer and the effective stroke becomes shorter.

Further, Japanese Utility Model Application Publication No. 47-33336 discloses a bellows-shaped flexible duct having rings fitted on its inner and outer surfaces. However, this duct simply bends due to external force, and if it is actively expanded or contracted as described above, it will be damaged, and it cannot withstand vacuum pressure.

Well, Japanese Utility Model Application Publication No. 48-29254 discloses a bellows made of linen cloth formed into a spiral cylinder shape, with a ring inserted into the inner surface. However, this bellows cannot be used in a vacuum chamber.

[Purpose of invention]

This was proposed in view of the problems of the prior art described above, and the object is to provide an airtight chamber membrane surface structure that can be used in a vacuum brick forming machine with a large plunger stroke.

[Structure of the idea]

The membrane surface structure for an airtight chamber of a vacuum brick forming machine of the present invention includes a lower punch installed on a fixed base of the forming machine, a pressure block that moves up and down in opposition to the lower punch, and a pressure block that moves up and down in opposition to the lower punch. A vacuum brick that includes a mold that slides along the outer circumferential surfaces of an upper punch and a lower punch attached to a shaft block, a mold support frame that supports the mold, and has an airtight chamber surrounding the upper punch and lower punch. In the membrane surface structure for the secret chamber of the molding machine, the airtight chamber surrounding the upper punch includes a first upper sealing ring fixed to the pressure block, and a first upper sealing ring attached to the upper surface of the mold and mold support frame. It is formed of a first lower sealing ring that engages with the table, and a first membrane surface structure in the form of a cylindrical bellows whose both ends are fixed to the first upper sealing ring and the first lower sealing ring. The airtight chamber surrounding the lower punch consists of a second upper sealing ring attached to the lower surface of the mold, a second lower sealing ring that is separable from the fixed base, and the two ends thereof. It is formed from a second upper sealing ring and a second membrane surface structure having a cylindrical bellows shape fixed to the second lower sealing ring, and the first and second membrane surface structures are folded. A reinforcing ring is provided at the bend.

[Effect of idea]

With this configuration, even if the molding stroke becomes long, it is only necessary to lengthen the dimensions of the cylindrical membrane structure, so there is no need to increase the installation area, and the membrane structure can be reinforced with ribs. Therefore, even when the airtight chamber is depressurized, it is prevented from being deformed due to the pressure difference with the outside air pressure, and it can be used with molding machines with large plunger strokes without damage.

〔Example〕

Embodiments of the present invention shown in FIGS. 1 to 4 will be described below.

The mold floating type vacuum brick molding machine to which the present invention is applied has an upper punch 2 attached below a pressure block 1, and a fixed base of the molding machine, as in the conventional example shown in FIG. On 12,
A lower punch 11 is installed opposite the upper punch 2. A mold support frame 7 is also supported on the fixed base 12 by a piston cylinder 13, and a mold 6 is attached to this frame 7 via a mold frame 7a.

A table 16 is provided on the frame 7, and a charger 14 is mounted on the upper surface of the table 16 so as to be slidable by a piston cylinder 17.
An upper sealing ring 20 (first upper sealing ring) is fixed to the lower surface of the pressure block 1 via a seal 20a, and a cylindrical bellows-shaped membrane structure is attached to the lower surface of the upper sealing ring 20. 22 The upper end of the first membrane structure is fixed. This membrane surface structure 22 is expandable and contractible, its bent portion is reinforced with a plurality of ribs 22a, and its lower end is fixed to the upper surface of the lower sealing ring 21 (first lower sealing ring). The ring 21 is supported by a piston cylinder 24. A seal ring 21a is provided on the lower surface of the ring 21 to improve airtightness when pushed down onto the table 16.

Further, the ring 21 is provided with an air flow path 21b, and an air intake flexible hose 23 is communicated with the ring 21.

On the other hand, an upper sealing ring 30 (second upper sealing ring) is attached to the lower surface of the mold 6 via a seal 30a.
is attached, and the upper end of a cylindrical bellows-shaped membrane structure 32 (second membrane structure) is fixed to the lower part of this ring. This membrane surface structure is expandable and contractible, and its bent portions are reinforced with ribs 32a.
The lower end portion is fixed to a lower sealing ring 31 (second lower sealing ring). This ring 31 is moved up and down by a piston cylinder 34.
A seal ring 31a is provided at the lower end of the flow path 31b to improve sealing performance.
It is connected to the intake hose 33 via.

Although the device of this embodiment is configured as described above,
Next, the operation of this device will be explained.

In FIG. 2, the piston cylinder 17 is operated to transfer the brick raw material charger 14 to the table 1.
6, the charger 14 is pushed out directly above the mold 6, the raw material 40 in the raw material tank 15 is filled into the mold 6, the charger 14 is pulled back and released from the top of the mold 6, and then the piston cylinder 2
4, the membrane surface structure 22 for the upper airtight chamber is extended, and the lower sealing ring 21 is pressed onto the table 16.

A seal ring 21a is attached to the bottom surface of the seal ring 21.
Since it is provided, it is kept in close contact with the 16 surfaces of the table to maintain airtightness. In this state, air is sucked into the upper airtight chamber 25 through the hose 23 communicating with an air intake source (not shown), thereby reducing the pressure in the chamber. At this time, the piston cylinder 13 provided on the fixed base 12 is extended, the mold support frame 7 is in the position shown in FIG. 2, and the membrane structure 32 is extended. piston cylinder 3
4 in the direction of reducing the lower sealing ring 3.
1 is pressed onto the seal plate 36 mounted on the fixed base 12. Since a seal ring 31a is provided at the lower end of the lower sealing ring 31, airtightness is maintained.
The lower airtight chamber 35 is depressurized via the hose 33.

In the state shown in Fig. 2, both the upper and lower membrane surface structures 2
2 and 32 are both in an extended state, and the airtight chamber 25,
35 of the pressure is reduced, but because of the reinforcing ribs 22a, 32a provided on the structures 22, 32, the structures are not bent inward and can maintain the shape of the airtight chamber.

Next, as shown in FIG. 3, the pressure block 1 is lowered. As a result, the upper punch 2 is inserted into the mold 6 and cooperates with the lower punch 11 to compress and mold the brick raw material. During this compression molding process, the upper membrane surface structure 22 is compressed and the volume of the upper airtight chamber 25 is reduced, but the reduced pressure inside the airtight chamber 25 is maintained during this process, and the brick raw material is Improves molding efficiency by discharging air, gas, etc. released from the mold.

During this compression molding, the lower airtight chamber 35 is maintained at reduced pressure, and air and gas coming out of the mold are similarly discharged.

After the compression molding process is completed, as shown in FIG. 4, the pressure block 1 is raised to remove the upper punch 2 from above the molded brick 40a. At the same time, the piston cylinder 24 is shrunk and the membrane surface structure 22 is shrunk. Next, the piston cylinder 13 attached to the fixed base 12 is contracted and the support frame 7 is lowered, so that the upper surface of the lower punch 11 coincides with the upper surface of the table 16.

Thereafter, a known take-out device (not shown) is operated to take out the molded brick 40a from above the lower punch 11, completing the molding cycle. As described above, this device configures the upper and lower airtight chambers with a pair of sealing rings and a cylindrical membrane structure that connects the rings. Since reinforcing ribs are formed, even when the membrane structure is stretched to form an airtight chamber and the pressure inside the chamber is reduced, the membrane structure will not collapse and deform due to the action of the ribs. This prevents damage and can accommodate molding machines with large plunger strokes.

Furthermore, for models that mold bricks, etc. with large thickness dimensions, even if the stroke of the pressure block is long, it can be handled simply by increasing the dimensions of the cylindrical membrane structure. has. The cylinder 34 serves to pull the lower sealing ring 31 upward when cleaning raw material spilled into the chamber 35.

In addition, in the above-mentioned embodiment, the case where the present invention was applied to a mold floating type press was explained, but the present invention can of course also be applied to a press machine in which the mold frame is fixed and pressurized by upper and lower punches. can.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 showing the material filling process for brick molding, and Figure 2 showing the state in which the upper airtight chamber has been formed.
FIG. 3 shows the brick forming process, and FIG. 4 shows the brick forming process completed. FIG. 5 is a side view showing a conventional floating mold vacuum brick molding machine. 1... Pressure block, 2... Upper punch, 6... Mold, 7... Mold support frame, 7a
...Mold holder, 11...Lower punch, 12...
...Fixing stand, 13...Piston cylinder for upper and lower mold support frame, 14...Raw material charger, 15
... Raw material tank, 16 ... Table, 17 ... Piston cylinder, 20 ... First upper sealing ring, 2
DESCRIPTION OF SYMBOLS 1... First lower sealing ring, 22... First membrane surface structure, 22a... Reinforcing rib, 23... Hose, 24... Piston cylinder, 25... Upper airtight chamber, 30... Second Upper sealing ring, 31...
Second lower sealing ring, 32... Second membrane surface structure, 32a... Reinforcement rib, 33... Hose, 34
... Piston cylinder for cleaning, 35 ... Lower airtight chamber, 40 ... Brick raw material, 40a ... Molded brick.

Claims (1)

[Scope of utility model registration request] A lower punch installed on a fixed base of a molding machine, a pressure block that moves up and down in opposition to the lower punch, and an upper punch and a lower punch that slide along the outer peripheral surfaces attached to the pressure block. and a mold support frame that supports the mold,
In a membrane surface structure for a secret chamber of a vacuum brick forming machine having an airtight chamber surrounding an upper punch and a lower punch, the airtight chamber surrounding the upper punch includes a first upper sealing ring fixed to a pressure block; a first lower sealing ring that engages with the mold and a table attached to the upper surface of the mold support frame; and a cylindrical bellows-like shape whose both ends are fixed to the first upper sealing ring and the first lower sealing ring. The airtight chamber surrounding the lower punch is formed of a second upper sealing ring attached to the lower surface of the mold, and a second upper sealing ring attached to the lower surface of the mold, and a second membrane surface structure provided so as to be separable from the fixed base. a second lower sealing ring with a second
and a cylindrical bellows-shaped second membrane surface structure fixed to the upper sealing ring and the second lower sealing ring, and the first and second membrane surface structures are formed at their bent portions. A membrane surface structure for an airtight chamber of a vacuum brick forming machine, characterized in that a reinforcing ring is provided at the top.