JPS623709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise reduction device for a mold making machine that makes a mold by passing compressed air through molding sand filled in a casting flask and exhausting it through small holes drilled in a model plate. .

In other words, in this type of mold making apparatus, the exhaust noise of the compressed air discharged from the small holes drilled in the model plate is not desirable in terms of noise pollution prevention, and for this reason, a silencer is not installed. Even if the model board were to be provided, the model board would have to be replaced frequently and would also have to be moved up and down, posing various troublesome problems.

The present invention aims to solve these problems.

The configuration of the present invention will be explained below based on examples.

Reference numeral 1 denotes a base installed on the foundation A. A cylinder 2 is installed in the center of this base with its piston rod 3 pointing upward, and the tip of the piston rod 3 has a concave shape in the center. A table 6 having a cavity 4 formed therein and equipped with exhaust holes 5 on both left and right sides is fixedly connected to the table 6, and furthermore, the table 6 has a cavity 7 in its lower central surface and has ventilation holes 8 penetrating vertically on the upper surface of the table 6. A perforated model plate 9 is attached to the upper plate member 9'. The vent hole 8 is provided with a vent plug 10 buried therein in a location where pressure is not applied to the molding sand during squeeze molding and it is difficult to obtain a predetermined mold hardness. Further, the ventilation hole 8 is communicated with the exhaust hole 5 via the cavities 4 and 7. Reference numerals 11 denote pillar members erected at the four corners of the base 1. Between the pillar members 11, a pair of roller conveyors 13 having a large number of flanged rollers 12 pivoted at approximately equal pitches are extended left and right. A rectangular casting flask 14 is placed on the roller conveyor 13 at a predetermined interval from front to back so that the table 6 can pass through. It is said to be placed and movable. 15 is inside.
The filling frame 15 has an outer dimension set to be approximately the same as that of the casting flask 14, and the filling frame 15 has a leg portion 16 projecting outward from the side surface and projecting inward from the pillar member 11. It is placed on the upper surface of the bracket 17 so as to be movable up and down by being engaged with a guide pin 18 erected on the upper surface. In addition, in the illustrated state in which the legs 16 of the filling frame 15 are placed on the bracket 17, the lower end of the filling frame 15 is spaced a predetermined distance from the upper end of the casting flask 14 placed on the roller conveyor 13. It has come to have a Furthermore, above the filling frame 15 placed on the bracket 17, a pair of roller conveyors 20 each having a large number of flanged rollers 19 pivoted at approximately equal pitches extend in the same direction as the roller conveyor 13. A box-shaped cover member 21 is provided on the roller conveyor 20, and the inner and outer dimensions of the lower end opening are set to be approximately the same as those of the filling frame 15.
is movably mounted via supporting members (not shown) protruding from the front and rear. Further, in the illustrated state before operation, the lower end of the cover member 21 has a slight distance from the upper end of the filling frame 15.
Support member 2 stretched over the middle part of cover member 21
A squeezing cylinder 24 with a piston rod 23 facing downward is installed at the piston rod 2, and a horizontal plate-shaped squeeze plate 25 is fixed to the tip of the piston rod 23. Reference numeral 26 denotes a guide pin erected on the upper surface of the squeeze plate 25 to prevent rotation of the squeeze plate 25 in a horizontal plane. Reference numeral 27 denotes a ceiling frame constructed on the upper end of the column member 11, and a reinforcing fixed frame 28 is spanned across the middle of the ceiling frame 27.
29 is a stopper member fixed to the lower surface of the ceiling frame 27. Reference numeral 30 denotes a hopper for supplying molding sand that can store the amount of molding sand for one mold production. The provided connecting member 31 and the connecting member 32 protruding from the left side of the cover member 21 are connected by a joint pin 33 so that the cover member 21 can move left and right on the roller conveyor 20 together with the cover member 21. 3
Reference numeral 4 designates a plurality of damper members forming the bottom of the hopper 30, which are rotated to open and close by a cylinder 35 fixed to the hopper 30. The cover member 21 and the hopper 30 are provided so as to be movable left and right on the roller conveyor 20 by a drive device (not shown). In addition, on both sides of the lower table 6, a muffler 36 with a sound absorbing material pasted on its inner surface connects a connecting member 37 protruding from the base end, and a joint pin 38 is connected to a supporting member (not shown) attached to the upper surface of the base 1. are rotatably connected through the
The muffler 36 has one upper end thereof connected to a supporting member 39 extending from the roller conveyor 13 at its rear end.
The piston rod 41 is rotatably connected to the tip of a piston rod 41 of a cylinder 40 which is rotatably supported on the cylinder 40.
It is configured to be rotated by the operation of the cylinder 40 so that the air supply port 42 of the tip opening can come into contact with and separate from the exhaust hole 5 of the table 6 located at the rising end. Further, a sealing member 43 made of an elastic material is attached to the periphery of the air supply port 42 at the tip opening of the muffler 36, and the air supply port 42 is provided so as to be closely connected to the exhaust hole 5 of the table 6. There is. Reference numeral 44 denotes a compressed air supply hole drilled through the end of the support member 22, to which the tip of an air hose communicating with a compressed air source (not shown) is connected.

Next, the operation of the device configured as described above will be explained.

First, the cover member 2 is driven by a drive device (not shown).
1 and hopper 30 from the illustrated state to the right to store molding sand for one casting flask.
0 is positioned directly above the filling frame 15.

Next, when cylinder 2 is actuated, table 6
At the same time, the model plate 9 is lifted up and fitted to the flask 14 located directly above the model plate 9, and then the flask 14 and the filling frame 15 are overlapped. In this state, the cylinder 2 is further raised and just before the upper surface of the filling frame 15 comes into contact with the lower surface of the hopper 21, the operation of the cylinder 2 is stopped.
4 is opened, and the molding sand in the hopper 30 flows into the casting flask 14.
and placed into the filling frame 15. After that, the cover member 21 is moved again to the filling frame 1 by a drive device (not shown).
5, the cylinder 2 is operated again to raise the model plate 9, casting flask 14, and filling frame 15 on the table 6, and the cover member 21 is further placed on the filling frame 15. The cover member 21 is then raised. The upper end surface of the cover member 24 comes into contact with the stopper member 29, and a sealed space is formed above the model plate 9 by the casting flask 14, filling frame 15, and cover member 21. On the other hand, when the table 6 has finished rising, the muffler 36 rotates around the joint pin 38 due to the operation of the cylinder 40.
The air supply port 42 is brought into contact with the exhaust hole 5 of the table 6 via a sealing member 43, and
The hollow portions 4 and 7 are connected in communication with a muffler 36. After that, when compressed air is supplied from the supply hole 44 of the cover member 21, this compressed air passes through the gap formed between the outer periphery of the squeeze plate 25 and the lower inner periphery of the cover member 21, and the filling frame 15 and Flows into the flask 14, filling flask 15 and flask 14
The molding sand passes through the molding sand inside the vent plug, deposits the molding sand densely and firmly on the surface of the model plate 9, and forms a layer of solidified molding sand along the surface of the model plate 7. 10, the air is led to the exhaust hole 5 of the table 6 through the ventilation hole 8 and the cavities 7, 4, and the air supply port 4
2, enters the muffler 36, is muffled, and is discharged to the outside air from the exhaust port of the muffler 36. After compressed air is supplied from the supply hole 44 for a predetermined period of time, the supply is stopped, and the cylinder 24 is subsequently operated to lower the squeeze plate 25 and remove the flask 1.
4. The molding sand in the filling frame 15 is squeezed and molded to a predetermined hardness and molding state. Now, when the squeeze operation is completed, the cylinder 24 operates in reverse and the squeeze plate 25 is raised, and at the same time,
The operation of the cylinder 40 also returns the muffler 36 to its original state as shown. After this, cylinder 2
operates in reverse and the cover member 21, filling frame 15, and casting flask 1
4 and the model plate 6 are lowered to the illustrated positions to perform mold release. On the other hand, molding sand for one mold is stored in the hopper 30 by a means (not shown) after the hopper 30 is returned to the position shown by a drive device (not shown) until the release operation is completed. After the mold release is completed, the flask 14 holding the mold inside is moved to the right on the roller conveyor 13 by a moving means (not shown), and the empty flask 14 is moved to just above the model plate 9. The series of operations described above are repeated to continuously form molds. Further, in the above embodiment, the muffler 3 is connected to the exhaust hole 5 of the table 6.
Although the air supply ports 42 of No. 6 are made to communicate with each other,
Exhaust holes may be provided on the left and right side surfaces of the model plate 9.

In short, in the present invention, an exhaust hole is provided on the side surface of the table, and the air supply port at the opening at the tip of the muffler is attached to and detachable from the exhaust hole, so there is no need to move the muffler when the table is raised or lowered. In addition to being structurally simple, the work of removing the muffler can be omitted when replacing the model plate, resulting in improved work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention. 5...Exhaust hole, 6...Model board, 36...Muffler, 42...Air supply port.

Claims (1)

[Claims] 1. A muffler 36 with a sound absorbing material pasted on the inner surface is placed on both outsides of a table 6 that can be raised and lowered and has exhaust holes 5 on both sides, with its air supply port 42 facing the table 6 side, and the muffler 36 is connected to a piston rod 41 of a cylinder 40 whose lower end is rotatably supported via a joint pin 38 and whose upper position is rotatably supported from the outside toward the table 6, A noise reduction device for a mold making machine, characterized in that the air supply port 42 of the muffler 36 is provided at a height corresponding to the exhaust hole 5 when the tea wheel 6 reaches its rising end.