JPH0433949Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an additive supply device for a sand mixer that supplies and mixes additives such as furan resin into foundry sand.

(Prior Art) Conventionally, there has been a sand mixer of this type having the structure shown in FIG. That is, a bottomed cylindrical sand mixing container body 101 is provided with a rotating shaft 102 rotatably supported around the axis at the center thereof, and a stirring blade 103 for mixing sand is provided on the rotating shaft 102. ing. Further, a supply pipe 105 for guiding an additive such as furan resin into the container body 101 is provided in communication with the peripheral wall 104 on the side of the container body 101 .

Then, the rotating shaft 102 is rotationally driven in a predetermined direction by a drive device such as a motor (not shown), and the foundry sand in the container body 101 is stirred by the stirring blades 103, and the additives are supplied through the supply pipe 105. is mixed with sand.

(Problem to be solved by the invention) However, according to the above structure, when the sand is stirred, the additive is transferred from the side peripheral wall 104 to the container body 101.
Because of the structure in which the additives are supplied inside, there was a high risk that the additives would hit the stirring blades 103 and be scattered.
Therefore, there was a drawback that the required blending ratio could not be obtained unless the additive was supplied in an amount greater than the required amount.

In view of the above problems, the present invention aims to reduce the amount of additives supplied by preventing the additives from scattering.

(Means for solving the problem) The technical means is that a rotary shaft 2 is installed in the center of a cylindrical sand mixing container body 1 with a bottom and is driven to rotate around the axis.
, the rotating shaft 2 is provided with a stirring blade 3 for mixing sand, and the sand mixing container body 1 is provided with an additive supply path for supplying the additive to be mixed with the sand. The supply path includes a primary supply path 6 that supplies additives above the rotational center of the stirring blade 3, and a secondary supply path 7 provided on the side of the stirring blade 3 to rotate integrally with the stirring blade 3. Therefore, the secondary supply path 7 is 1
A receiving container section 8 that receives the additives supplied from the next supply path 6, and an additive guide path 1 extending from the lower part of the receiving container section 8 toward the side peripheral wall 9 of the sand mixing container body 1.
0, and the additive discharge port 11 at the end of the additive guide path 10 is located at the rear side in the rotational direction of the stirring blade 3.

(Function) According to the present invention, the stirring blades 3 are rotationally driven in a predetermined direction A together with the rotating shaft 2, and the sand is stirred.

On the other hand, the additives are supplied through the primary supply path 6 to the receiving container section 8 of the secondary supply path 7, and then through the additive guide path 10 from the additive discharge port 11 into the sand from the rear side in the rotational direction of the stirring blade 3. supplied to Therefore, direct collision between the additive and the stirring blade 3 can be prevented.

Further, since the secondary supply path 7 rotates integrally with the stirring blade 3, the additive can be evenly supplied throughout the sand mixing container body 1.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In Figures 1 to 3, 1 is a sand mixing container body 1 of a sand mixing machine, which is configured in a cylindrical shape with a bottom. .

A rotating shaft 2 is provided at the center of the container body 1, that is, at the center thereof, and is rotatably supported around the axis of the container body 1, and is rotationally driven in a predetermined direction A by a drive device such as a motor (not shown). It is configured so that

The rotary shaft 2 is provided with stirring blades 3 for mixing sand in a radially protruding manner on the opposing outer peripheral surface.

Reference numeral 5 denotes an additive supply device for supplying additives into the container body 1, which serves as a primary supply path for supplying additives above the rotation center of the stirring blade 3, that is, above the rotating shaft 2. It comprises a pipe 6 and a secondary supply body 7 as a secondary supply path which is fixed to the stirring blade 3 side, that is, the rotating shaft 2, so as to rotate integrally with the stirring blade 3. 7 includes a funnel-shaped receiving container portion 8 that receives the additives supplied from the primary supply pipe 6, and a stirring blade extending radially from the lower end of the receiving container portion 8, that is, toward the side circumferential wall 9 of the sand mixing container body 1. A guide pipe 10 as an additive guide path extended along 3
It is composed of. The end of the guide pipe 10 is bent downward, and the lower end is opened as an additive discharge port 11. Also, Figures 1 and 2
As shown in the figure, this additive discharge port 11 is located at the rear side of the stirring blade 3 in the rotational direction.

As shown in FIGS. 2 and 3, the lower end of the primary supply pipe 6 is placed on the rotation center of the stirring blade 3, and is loosely inserted into the upper receiving port 12 of the receiving container section 8. 12 and has an appropriate gap.

The embodiment of the present invention is constructed as described above, and the rotating shaft 2 is rotationally driven in a predetermined direction A by the operation of the drive device, and the foundry sand in the sand mixing container body 1 is delivered to the stirring blades 3. It is then stirred. Additives such as furan resin are then supplied into the container body 1 through the additive supply device 5 and mixed with the sand.

That is, the additive is supplied to the receiving container part 8 through the primary supply pipe 6, and then to the guide pipe 10.
is supplied into the sand from the additive outlet 11 through the
mixed with sand.

At this time, since the additives are supplied into the sand from the rear side in the rotating direction of the stirring blades 3, scattering due to direct collision with the stirring blades 3 can be prevented. The supply amount can be reduced and costs can be reduced. In addition, since the additive discharge port 11 is rotated together with the stirring blade 3, the additive is evenly supplied throughout the sand mixing container body 1, as in the conventional case.
Compared to a structure in which additives are supplied from one side, sand is obtained in a better mixed state.

Furthermore, since the secondary supply body 7 rotates together with the stirring blade 3, even if the additive is viscous or the guide pipe 10 is installed horizontally, it can be efficiently guided and discharged by the centrifugal force. Clogging of additives can be effectively prevented.

For example, when mixing furan resin with sand, conventionally, 1% of furan resin was added to the weight of the sand, but according to the present invention, to obtain the same sand strength,
It is only necessary to add 0.8% of furan resin to the weight of sand, which means that 20% of the supplied furan resin
This means that the particles were scattered.

In the above embodiment, a structure in which the secondary supply body 7 is separately fixed on the side of the stirring blade 3 is shown, but it is also possible to provide a receiving container portion and an additive guide path on the rotating shaft 2 and the stirring blade 3 itself. It may also be a structure.

In addition, a sand discharge port which can be opened and closed is appropriately provided in the bottom part 14 of the sand mixing container body 1.

(Effects of the invention) According to the invention, a rotary shaft that is driven to rotate around the axis is provided in the center of a cylindrical sand mixing container body with a bottom, and a stirring blade for mixing sand is provided on the rotary shaft, In a sand mixing container equipped with an additive supply passage for supplying additives to be mixed with sand, the additive supply passage supplies the additive above the rotation center of the stirring blade. and a secondary supply path provided on the side of the stirring blade to rotate integrally with the stirring blade, and the secondary supply path includes a receiving container section that receives the additive supplied from the primary supply path, and a receiving container section that receives the additive supplied from the primary supply path. It consists of an additive guide path extending from the bottom of the container part toward the side circumferential wall of the sand mixing container body, and the additive discharge port at the end of the additive guide path is located at the rear side in the direction of rotation of the stirring blade. This effectively prevents the supplied additives from scattering and reduces the amount of additives supplied.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main part showing the embodiment of the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is a partially enlarged sectional view of Fig. 2, and Fig. 4 is the main part side showing the conventional example. FIG. DESCRIPTION OF SYMBOLS 1... Sand mixing container body, 2... Rotating shaft, 3... Stirring blade, 5... Additive supply device, 6... Primary supply pipe, 7... Secondary supply body, 8... Receiving container part ,9
... Side peripheral wall, 10 ... Guide pipe, 11 ... Additive discharge port.

Claims (1)

[Scope of utility model registration request] A cylindrical sand mixing container body 1 with a bottom is provided with a rotating shaft 2 at the center thereof, which is driven to rotate around the axis, and a stirring blade 3 for mixing sand is provided on the rotating shaft 2. In a device equipped with an additive supply channel for supplying additives to be mixed with sand, the additive supply channel includes a primary supply channel 6 that supplies the additive above the rotation center of the stirring blade 3, and a stirring It consists of a secondary supply path 7 provided on the stirring blade 3 side to rotate integrally with the blade 3, and the secondary supply path 7 includes a receiving container section 8 that receives the additives supplied from the primary supply path 6. and an additive guide path 10 extending from the lower part of the receiving container part 8 toward the side circumferential wall 9 of the sand mixing container body 1, and the additive outlet 11 at the end of the additive guide path 10 is connected to the stirring blade 3.
An additive supply device for a sand mixer, characterized in that it is located at the rear side in the rotational direction of the sand mixer.