JPH0214836Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a scraper device for a mold making machine.

Conventional Technology Traditionally, both manual scraping and mechanical scraping have been used to scrape off molding sand from the mold blowing surface of a mold making machine, and mechanical scraping devices are expensive and scrape is incomplete. There is also
In small molding machines, most of the scraping is done by hand, and in this case, one worker is required for each molding machine, which hinders automatic molding.

In addition, in mechanical scraping devices, a dedicated cylinder is operated to place and move the scraper device on the mold blowing surface during scraping, which requires a separate power source and has a complicated mechanism.
It is inevitable that it will be expensive. Furthermore, there is a method in which a scraper holder is fixed to the blow head or blow head cart, a coil spring is used on the hinge part, and a scraper knife is pressed against the mold blowing surface to scrape the mold. When changing direction, lift the blow head and blow head cart, bend the piston rod of the cylinder for moving the blow head,
The scraper knife sticks out and stops, then suddenly moves, resulting in unsafe operation. Also, the blow head is vibrated and sand falls, making it necessary to clean the mold blowing surface again. However, there are various drawbacks such as the need to lower the edge of the upper surface of the mold so that the direction of the scraper can be changed.

Problems that the invention aims to solve Although it is a mechanically operated device, it has a simple mechanism, does not require a dedicated power source, can easily perform the next operation even in the event of a power outage or emergency stop, and is oversized. The purpose of the present invention is to provide a scraper device that can be applied to molds such as the above, and has various functions such as easy adjustment according to the height of the mold.

Means to Solve the Problems In view of the above-mentioned points, the present inventor has succeeded in developing the present invention as a result of various studies and experiments, and the structure of the present invention is as specified in the claims for the above-mentioned utility model registration. However, a detailed explanation will be given based on the accompanying drawings showing one embodiment of the device of the present invention.

FIG. 1 is a partially sectional side view of a mold making machine equipped with the scraper device of the present invention, and FIG. 2 is a front view in the direction of the arrow in FIG.

In the figure, a blow head 1 is suspended from a blow head truck 2 via a spring 3, and a blow plate 4 provided with a blow hole is attached to the lower part of the blow head 1. Wheels 5 are attached to the upper part of the blowhead truck 2, and the blowhead truck 2 is configured to be movable on an upper rail 6 to the blowing side and the supplying side by a drive mechanism (not shown). A support portion 2' is provided on the front surface of the blowhead truck 2 and protrudes from the scraper device, which has a hole through which the guide screw 7' of the scraper holder 7 is loosely inserted. The lower part of the scraper holder 7 is a hinge, and the scraper knife 8 is connected with a pin 9 so as to be able to swing freely. When the scraper knife 8 moves from the right side to the left side in FIG. 1, the lower surface of the scraper knife 8 presses against the upper surface of the mold 11 due to the resistance of the leaf spring 10 attached to the scraper holder 7. There is.

FIG. 3 shows details of the scraper device of the present invention. A guide screw 7' is provided on the upper part of the scraper holder 7, and a guide screw 7' is provided at the top of the scraper holder 7.
The mechanism is such that it can slide up and down through the through hole 2'' of the support portion 2' that protrudes from the support portion 2''.
The inner diameter of the scraper holder 7 is slightly larger than the outer diameter of the scraper holder 7. As shown in the figure, a nut 12 is attached to the upper part of the guide screw 7', and the mechanism is such that the scraper device can be adjusted up and down according to the height of the mold 11. A nut 14 is attached via a spring 13.

The spring 13 is activated when an upward force is applied to the scraper knife 8, that is, when the scraper knife 8 changes direction on the upper surface of the mold 11, the scraper knife 8 becomes vertical as shown in FIG. Since an upward force is applied to the arc portion scraper device, this force is absorbed by the upward sliding of the scraper holder 7 and the spring 13, so that no upward force is applied to the blow head truck 2, and only the scraper device rises. The scraper knife 8 is also configured to press the end surface of the scraper knife 8 against the upper surface of the mold 11.

The device of the present invention has the above-mentioned configuration,
The operating mode will be explained below based on the molding operation.

Blowhead 1 replenishes sand at the replenishment position.
Then, the blow head truck 2 moves and comes to the blowing position above the mold 11, at which time the scraper knife 8
The lower surface of the metal mold 11 touches the upper surface of the mold 11 and is tilted about the pin 9, and moves without pressing the upper surface of the mold 11. A known pressure cylinder (not shown) operates to press the blow head 1 onto the mold 11, and at the same time air enters the blow head 1 and blows sand into the molding cavity of the mold 11. The blowing is completed and the air in the blow head 1 is discharged.

The crimp cylinder returns to its original position and blow head 1
The sand also separates from the mold 11 and rises, and at this time, residual sand in the blow plate 4 remains on the upper surface of the mold 11. The blowhead truck 2 moves laterally and returns the blowhead 1 to its replenishment position. At this time, the scraper knife 8 moves back while scraping the excess sand on the upper surface of the mold 11 and discharges it out of the mold 11. After the sand in the mold 11 has hardened, the mold 11 is opened and the mold is taken out.The inner surface of the mold 11 is cleaned, the mold 11 is closed, and the next molding cycle begins.

Effects of the invention (1) The structure is simple, and it is inexpensive and can be scraped without requiring special power.

(2) When the scraper knife is on the mold during a power outage or emergency stop, even if the blow head truck changes direction, the direction of the scraper can be changed without lifting the truck and blow head.

(3) Even if the scraper does not come off the mold at the moving end due to oversized molds, etc., it will still operate normally for the same reason as in 2).

(4) Even if the mold height changes, it can be easily changed and adjusted.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional side view of a mold making machine equipped with an example of the scraper device of the present invention, and Figure 2 is a side view of a mold making machine equipped with an example of the scraper device of the present invention.
3 is a detailed view of the scraper device of the present invention. In the figure, 1 is a blow head, 2 is a blow head truck, 2' is a support part, and 2'' is a through hole in the support part 2'. , 3 is a blow head suspension spring, 4 is a blow plate, 5 is a wheel, 6 is an upper rail, 7 is a scraper holder, 7' is a guide screw, 8 is a scraper knife, 9 is a pin, 10 is a leaf spring, 11 is a mold, 12 is a nut,
13 is a spring, and 14 is a nut.

Claims (1)

[Scope of utility model registration request] The guide screw 7' of the scraper holder 7 is slidably inserted via the spring 13 through the through hole of the support part 2' protruding from the lower part of the blow head truck 2 of the mold making machine, and the scraper holder 7 is attached to the lower part of the scraper holder 7. A knife 8 is rotatably mounted, and a leaf spring 1 for pressing the scraper knife 8 is attached.
0 on one side of the scraper holder 7.