JPS6239876Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for supplying reduced pressure to a flask.

For example, in a vacuum mold making method in which the pressure inside the flask is vacuumed to solidify the foundry sand wrapped in the flask and synthetic resin film to form a mold, it is possible to It is necessary to reduce the pressure inside the flask until it solidifies to some extent. Therefore, in a line where a large number of flasks are connected to continuously form molds and pour molten metal, the inside of the flask must be suctioned even while the flasks are moving. A fixed suction device is installed on one side of the flask, and a movable suction device is installed on the other side. Each is suctioned by a type suction device. Molten metal is poured into the mold by a worker holding a ladle on a work deck installed above a fixed suction device, but the height of the work deck is higher than the top surface of the mold. Since the height of the ladle is almost the same as that of the mold, the position of the ladle is inevitably raised, resulting in a large head difference between the ladle and the mold, making pouring work extremely difficult.

The present invention has been made to solve the above problems, and one embodiment of the present invention will be described in detail below with reference to the drawings. Reference numeral 1 indicates upper and lower casting flasks used in the vacuum mold manufacturing method, which are mounted on a mold truck 4 that rests on rails 3 laid through a foundation frame 2, and are moved in the direction of the arrow by an extrusion device (not shown). It is designed to be transferred intermittently in one frame. A hollow chamber (not shown) is formed in the side wall of the flask 1, and a valve mechanism is provided on one side of the flask 1 and communicates with the hollow chamber and opens by the suction action of a valve mechanism 12, which will be described later. 5 is attached, and valve mechanisms 6 and 7 having the same structure as the valve mechanism 5 are also attached to the other side of the flask 1 at a predetermined interval in the front-rear direction. Reference numerals 8 and 8 indicate a suction installed at the outside position on one side of the flasks 1 and 1, excluding the place where the worker pours metal (pouring station W), at the same pitch as the pitch of the valve mechanism 5 of the flask 1. The suction device 8 includes a cylinder 10 fixed on a base 9, and a bracket 11 at the tip of the piston rod of the cylinder 10.
The valve mechanism 12 is connected to a vacuum pump (not shown) through a flexible hose, and when it comes into contact with the valve mechanism 5, the valve mechanism 12 is connected to the vacuum pump (not shown) through a flexible hose. It communicates with the mechanism 5 so that reduced pressure can be supplied into the hollow chamber of the flask 1 via the valve mechanism 5. Reference numeral 13 denotes an elongated sealed box that is connected to a vacuum pump (not shown), and the sealed box 13 includes a support plate 14 fixed to the lower surface and a plurality of pairs of rollers 16, 1 supported by frames 15, 15.
Further, the tip of the piston rod of a cylinder 17 installed horizontally is fixed to the tip of the sealed box 13, and the sealed box 13 is supported by the cylinder 17 when the cylinder 17 is extended. It is designed to move back and forth. On the sealed box 13, there are four suction devices 18, 18, 19 having the same structure as the suction device 8,
19 are installed at the same pitch as the valve mechanism 7 of the flask 1, and the valve mechanisms 20, 21 of these suction devices 18, 19 are communicated with the sealed box 13 via a flexible hose (not shown). It is connected. and,
Two rear suction devices 18, cylinders 22 of 18,
The stroke at 22 is the suction device 1 with two front units.
It is longer than that of the cylinders 23, 23 of 9, 19, and swing type suction devices 25, 2, which will be described later.
The valve mechanisms 30, 30 of 5 are replaced by the valve mechanisms 6, 30 of flasks 1, 1,
The valve mechanisms 20, 20 are moved back to the required positions so that the valve mechanisms 20, 20 do not interfere with the rotating bracket 29 of the suction device 25 when the suction devices 18, 18 are moved while in contact with the suction device 6. (See Figure 2). Reference numeral 24 denotes a square-shaped frame, which is installed at a position facing the pouring station W on the outside of the closed box 13. Two suction devices 25, 25 are fixedly installed on the frame 24, facing the valve mechanisms 6, 6 of the flasks 1, 1 of the pouring station W, and the suction devices 25 are connected to the cylinders. 26, and a rotating bracket whose upper end is rotatably connected with a pin to the tip of the piston rod of the cylinder 26, and whose bent position is rotatably supported by the frame 24 via a support shaft 27 and a bearing unit 28. 29, and two valve mechanisms 30, 30 mounted below the rotating bracket 29 and communicatively connected to a vacuum pump (not shown) via a flexible hose. 30 is separated from and brought into contact with the valve mechanisms 6, 6 by the expansion and contraction operations of the cylinders 26, 26. 31, 32
is a guide bar, and 33 and 34 are brackets.

Next, the operation of the above device will be explained. When the flasks 1, 1 containing the molds are depressurized by suction, if the flasks 1, 1 are stopped, the cylinders 10 of the fixed suction devices 8, 8 are extended and activated. Fixed suction device 25
By shortening the cylinder 26 of the valve mechanism 12, 3,
0 are brought into contact with the valve mechanisms 5 and 6 of the flasks 1 and 1, respectively, and the insides of the flasks 1 and 1 are suctioned and depressurized. Under this condition, the worker steps on a work deck (not shown) and pours the metal, and the height of the work deck can be freely selected because the pouring station W does not have a suction device. Therefore, the work deck can be lowered so that the ladle is brought closer to the mold and the drop is reduced to perform pouring, making the pouring work very easy. When the flasks 1, 1 are moved in the direction of the arrow after pouring, the cylinders 22, 23 of the suction devices 18, 19 are extended and the valve mechanisms 20, 21 are moved.
are brought into contact with the valve mechanisms 7, 7 of the flasks 1, 1, respectively, and the flasks 1, 1 are further removed by the suction devices 18, 19.
Then, the cylinders 10, 10 are shortened and the cylinders 26, 26 are extended to separate the valve mechanisms 12, 30 from the valve mechanisms 5, 6, respectively, and the cylinder 17 is shortened. The sealed box 13 and the suction devices 18, 19 are synchronized with the speed of the flasks 1, 1, and are moved to the right while sucking the inside of the flasks 1, 1. After moving the flasks 1, 1 a distance equivalent to one flask while reducing the suction pressure in this manner, the cylinders 10, 10 are extended, and the cylinders 26, 26 are shortened, and the valve mechanism 12,
12, 30, 30 are brought into contact with the valve mechanisms 5, 5, 6, 6 again so that they are sucked by the valve mechanisms 12, 30, and the cylinders 22, 23 are shortened to move the valve mechanisms 20, 21 to the valve mechanism 7. , 7 and put it in the state shown in FIG. One cycle is completed by extending the cylinder 17 and returning the suction devices 22 and 23 to their original positions.

In the above embodiment, the extrusion stroke and arrangement of the cylinders 22 and 23 are different, but the cylinder 23 may have the same extrusion stroke and arrangement as the cylinder 22.

As explained above, the present invention eliminates the need to install a suction device on the pouring station W, making it possible to freely select the height of the work deck. Since the working deck can be lowered so that the pouring work can be done by pouring the metal, it has excellent practical effects such as making the pouring work very easy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view, and FIG. 2 is a view taken along arrows A to A in FIG. 1. 1: flask, 5; 6; 7: flask valve mechanism, 8: suction device, 13: sealed box, 18; 19: suction device,
24: Frame, 29: Rotating bracket, 30:
Valve mechanism.

Claims (1)

[Scope of utility model registration request] A pouring station at an outer position on the other side of a conveyor line in which a plurality of vacuum molding flasks 1, 1 each having a valve mechanism 6, 7 on one side and a valve mechanism 5 on the other side are moved intermittently in the form of a dumpling. At positions other than the W position,
The suction device 8, 8 with the valve mechanism 12 is connected to the valve mechanism 5, 5.
Valve mechanisms 12, 12 are installed facing each other, and a closed box 13 connected to a vacuum pump is installed at a position outside one side of the conveyor line so as to be able to reciprocate along the direction of movement of the flasks 1, 1. installed in the sealed box 13
Above is a valve mechanism 20 that is communicatively connected to the sealed box 13.
A suction device 18 is installed at the same pitch as the valve mechanisms 7, 7, and a frame 24 is installed at a position facing the pouring station W on the outside of the sealed box 13. A reduced pressure supply device to a flask, characterized in that a suction device 25 is provided with a valve mechanism 30 that can come into contact with and separate from the valve mechanism 6 via a rotating bracket 29.