JPH0349780Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a sand supply device for a side blow molding machine, and more specifically, a flexible hose is connected to the upper surface of a blow tank via an elastic membrane. This relates to a sand supply device. This is used in the field of molding machines that form casting cores by blowing sand into them.

[Conventional technology]

The core required for casting is formed, for example, by blowing sand into a mold having an upper and lower two-piece structure. The sand inlet connected to the cavity in the mold is provided on the cracked surface of the upper and lower molds, or on the side surface of one of the molds. However, in any case, it is located on the side of the molding machine and is connected to the nozzle of a blow tank that supplies sand.

In such a side blow type molding machine, a blow tank is moved towards and away from the inlet. The blow tank has a closed structure, but its top surface can be opened and closed so that sand blown from the nozzle can be replenished, and a high-pressure air pipe is attached to introduce pressurized air into the tank. (For example, see Japanese Patent Application Laid-Open No. 57-206550).

Conventionally, when replenishing sand into the above-mentioned blow tank, the blow tank was evacuated from the molding machine, the valve attached to the sand reservoir directly above was opened with an air cylinder, and sand was poured into the sand replenishment port on the top surface. is falling. At that time, some of the sand does not enter the blow tank and scatters onto the upper surface of the tank and the surrounding floor surface. Since the blow tank moves on a track and moves toward and away from the molding machine, the accumulated sand may obstruct its movement, and the scattered sand may cause dust to float in the work area, resulting in poor work environment and work efficiency. There's a problem.

On the other hand, when the blow tank is advanced and sand is blown into the mold by placing the nozzle in close contact with the inlet of the molding machine, the sand supply port must be closed by crimping to prevent the sand in the blow tank from leaking from the top surface. It is necessary to keep it. For this reason, the advance position of the blow tank is
It is necessary to install a device for closing the top surface, which has the drawback of complicating the molding equipment and increasing its cost.

[The problem that the idea attempts to solve]

By the way, in order to prevent sand from spilling when replenishing the blow tank with sand or from leaking due to pressurized air in the blow tank, the sand reservoir and the tank should be connected airtight with a hose or the like. do it. However, as described above, since the blow tank moves toward and away from the molding machine at a fixed position, the lower end of the hose, which is always filled with sand, moves back and forth, causing the hose itself to swing like a pendulum.

If the hose is made of a highly flexible material and is made long, changes in the posture of the hose due to swinging motion will be small and vertical displacement of the lower end can be ignored.
Generally, replenishment from the sand basin relies on gravity, so the hose is likely to become clogged, and to prevent this, it is desirable to keep the hose short. However, if the length is shortened, there is a problem that bending and tension at the fixed portion of the hose due to swinging will increase.

On the other hand, the hose connection section on the upper surface of the blow tank on which pressurized air acts must withstand the pressure, and the hose must be firmly fixed. Furthermore, even if a flexible hose is used, it is difficult to absorb the bending deformation and vertical displacement caused by the sand-filled hose as the probe tank moves toward and away from the hose. Therefore, excessive force is intermittently applied to the hose due to repeated insertion and insertion.
There is a problem that the hose may be damaged or its durability may be reduced.

The present invention was developed in view of the above-mentioned problems, and its purpose is to improve the working environment by eliminating sand spillage when replenishing sand to the blow tank that moves toward and away from the molding machine. To provide a sand supply device for a side blow molding machine that can reduce the amount of deformation of a flexible hose for replenishing sand and the repeated loads acting on the hose, and increase the durability of the flexible hose.

[Means to solve the problem]

The present invention is applied to a sand supply device for a side blow molding machine, which supplies sand to a blow tank provided movably toward and away from the side surface of a mold.

Its characteristics are as shown in Figure 1.
An opening is formed in the upper surface 2a of the blow tank 2, and an elastic membrane 14 that closes the opening is fixedly attached around the opening.
The center portion of the elastic membrane body 14 is located at the blow tank 2
Sand hopper 9 and flexible hose 1 installed above
Connected by 1.

When pressurized air is introduced into the blow tank 2 described above, the presser plate 19 that suppresses excessive expansion of the elastic membrane body 14 is attached to the elastic membrane body 14, except for the connecting portion with the flexible hose 11. It is installed to cover the top of the Even if the lower end of the flexible hose 11 moves with the movement of the blow tank 2 toward and away, the elastic membrane 1
By vertically displacing the central portion of the flexible hose 11, the lower end of the flexible hose 11 is allowed to be displaced, and the overall deformation of the flexible hose 11 can be reduced.

[Effect of idea]

According to the present invention, the central part of the elastic membrane body can be vertically displaced as the blow tank moves toward and away from the blow tank, allowing vertical movement of the flexible hose and reducing deformation of the entire flexible hose. be done. As a result, a flexible hose can be used, sand can be replenished in an airtight manner, spilled sand can be removed, and the working environment can be improved, and the durability of the hose can also be improved. Furthermore, sand can be supplied from the flexible hose in a sealed manner, and there is no need to separately install a mechanism for closing the sand supply port on the top surface, resulting in inexpensive molding equipment.

〔Example〕

The present invention will be described in detail below based on examples thereof.

Figure 1 is a sectional view of the entire equipment including the sand supply device of the side blow molding machine of the present invention.
A blow tank 2 is arranged which can freely move toward and away from A and 1B from the lateral direction. Both molds forming the cavity 3 for molding the core can be separated in the vertical direction, and in this example, the upper mold 1A is attached to a support column 4 in a molding workshop, and is raised and lowered by a separate cylinder mechanism or the like. , fixed lower mold 1
It is designed to be superimposed on B.

In such a molding die 1, an inlet 5 for drawing sand into the cavity 3 is opened on the side surface of the lower die 1B, and the nozzle 6 of the blow tank 2 is tightly connected to the inlet 5. It is opened at the position. The blow tank 2 is, for example, a cylinder or a box, and is movable on a track 7 via wheels 8. When replenishing sand into the blow tank 2, it is evacuated as shown by the solid line, and the mold 1 When sand is blown into the mold 1, it can be advanced as shown by the dashed line, and it can be moved toward and away from the mold 1 by manual or automatic operation.

A sand hopper 9 in which a large amount of sand 10 for molding cores is stored is installed almost directly above the position where the blow tank 2 has evacuated. The sand 10 is transmitted through the hose 11 by the action of gravity and can be introduced into the blow tank 2 through an opening formed in the upper surface portion 2a. Although the hose 11 is flexible, it is always filled with sand and is not necessarily in a state where it is easily deformed such as bending. The upper end of the flexible hose 11 is fixed to the chute 13 of the sand hopper 9 with a hose band 12, and the lower end of the chute 13 is located approximately at the center of the distance over which the blow tank 2 moves toward and away from the sand hopper.

The lower end of the flexible hose 11 is connected to the upper surface 2a of the blow tank 2, and the upper surface 2a is provided with an elastic membrane 14 that closes most of its opening. It is connected to a pipe 15 fixed to. The pipe 15 is fixed at the opening in the center of the elastic membrane 14 using a hose band 16, and has a valve 17 at its lower end that discharges sand and prevents its backflow.
is installed.

To fix the above-mentioned elastic membrane body 14 to the tank 2, a stop plate 18 is used which fixes only the periphery of the elastic membrane body 14 in order to enable its vertical movement. Above the stop plate 18 is a holding plate that suppresses excessive expansion of the elastic membrane body 14 when pressurized air to be blown into the blow tank 2 is introduced from a high-pressure air pipe 21 described later. 19 are provided.

This holding plate 19 is provided with a hole 20 to the extent that only the connecting portion between the elastic membrane body 14 and the flexible hose 11 is exposed to the outside, so that when pressure is applied to the inner surface of the elastic membrane body 14, Although the elastic membrane body 14 is allowed to undergo deformation, a highly rigid plate is used to prevent the elastic membrane body 14 from bulging that would cause damage. Therefore, even when the blow tank 2 moves toward and away from the blow tank 2, the elastic membrane 14 can be vertically displaced within a range that does not impair its durability, and the flexible hose 11 tends to be prevented from being deformed by sand flowing through it. rocking motion is allowed,
This reduces deformation such as bending of the hose itself.

According to this embodiment, by operating as follows, the flexible hose 11 can be caused to behave smoothly due to the movement of the blow tank 2 toward and away from the blow tank 2.

Sand 10 is discharged from the sand hopper 9 through the chute 13 while the blow tank 2 is evacuated.
moves within the flexible hose 11 by gravity and falls from the tip of the pipe 15 opening into the blow tank 2. The sand 10 is deposited in a mountain shape in the blow tank 2 with an angle of repose determined by its properties. When the top of the sand 10 comes into contact with the valve 17, the sand in the hose 11 and the mountain-shaped sand are connected to each other at the opening of the valve 17, and the flow of sand due to its own weight stops.

Next, when the upper mold 1A is lowered and stacked on the lower mold 1B, the blow tank 2 is moved toward the introduction port 5. Since the length of the flexible hose 11 does not change, the tip of the hose 11 traces a trajectory M as shown by the two-dot chain line as the blow tank 2 moves.

In this example, the lower end of the soyute 13 is located at the center of the distance between the tank and the tank, so that the lower end of the flexible hose 11 reaches its lowest height at the midpoint of the movement. At this time, the elastic membrane 14 is deformed so as to bend downward, so that the flexible hose 11 can perform rocking motion while its lower end moves up and down without bending. That is, the vertical displacement of the flexible hose 11 causes the elastic membrane body 1 to
A vertical displacement of the center portion of No. 4 is permitted.

Nozzle 6 of blow tank 2 is inlet 5 of mold 1
When the nozzle reaches the position where it comes into close contact with the mold 1, the advance of the blow tank 2 is stopped, and the nozzle is connected and fixed by a mechanism (not shown) so that it does not separate from the mold 1. In this state, pressurized air is introduced from the high-pressure air pipe 21, and the sand is pressed by the pressure and blown out from the nozzle 6.
It is blown into the cavity 3 of the mold 1 by the air current.

At this time, a force acts on the valve 17 attached to the lower end of the pipe 15 in the direction of closing it due to the pressure of the high-pressure air, and the sand 10 is discharged from the flexible hose 11 connected to the sand hopper 9 to the blow tank 2. It will not be introduced internally. The pressurized air that blows out the sand 10 deforms the elastic membrane 14 so that it bulges out, but a presser plate 19 fixed on the stopper plate 18 prevents the elastic membrane 14 from expanding any further. Ru.

Note that when the sand 10 is being blown in, the lower end of the flexible hose 11 is at a high position, similar to when sand is being replenished. Therefore, the elastic membrane body 1
Even if pressure is applied to each surface of the device, the amount of expansion of the elastic membrane is small, and deformation caused by operation of the device and fatigue due to repeated deformation are reduced.

As can be seen from the above explanation, the upper end of the blow tank is covered with an elastic membrane whose periphery is fixed, and the central part of the elastic membrane is connected to the sand hopper with a flexible hose, so that pressurized air is A holding plate is provided to suppress excessive expansion of the elastic membrane when introduced into the tank, so even if the lower end of the flexible hose is displaced vertically as the blow tank moves toward and away from the tank, the elastic membrane remains By vertically displacing the central portion of the membrane, deformation of the entire flexible hose is reduced. As a result, it becomes possible to use a flexible hose, and it is possible to replenish sand in an airtight manner, eliminate sand spillage, and improve the working environment. Moreover, the durability of the flexible hose can be improved. Moreover, since sand can be supplied from the hose in a sealed manner, there is no need to separately install a mechanism for closing the sand supply port on the top surface.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the overall configuration of a molding device including a sand supply device of a side blow molding machine of the present invention. 1... Molding mold, 2... Blow tank, 2a...
... Upper surface part, 9 ... Sand hopper, 11 ... Flexible hose, 14 ... Elastic membrane body, 19 ... Presser plate.

Claims (1)

[Scope of Claim for Utility Model Registration] In a sand supply device for a side blow molding machine that supplies sand to a blow tank that is movable toward and away from the side of a mold, the top surface of the blow tank An opening is formed in the area, and an elastic membrane is fixedly attached around the opening to close the opening, and a sand hopper and a sand hopper installed above the blow tank are connected to the center of the elastic membrane. are connected by a flexible hose, and when pressurized air is introduced into the blow tank, a holding plate that suppresses excessive expansion of the elastic membrane body connects the connection part with the flexible hose. The flexible hose is provided so as to cover the upper part of the elastic membrane, and even if the lower end of the flexible hose moves as the blow tank moves toward and away, the center portion of the elastic membrane will be displaced up and down. A sand supply device for a side blow molding machine, characterized in that the lower end of the flexible hose is allowed to be displaced, thereby reducing overall deformation of the flexible hose.