JPH0641706Y2 - Foundry sand blowing device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a casting sand blowing device, and more specifically, sand is scattered when the blow head of a horizontal top blow head shell machine is changed when the mold is changed. The present invention relates to a foundry sand blowing device that can be easily performed without performing.

[Conventional technology]

In the apparatus of this type, conventionally, as shown in FIG. 2, a resin coated sand (hereinafter, referred to as molding sand) having good fluidity is blown into a heated mold by compressed air to form a main mold and a core. A molding sand blowing device for molding is generally used.

This kind of foundry sand blowing device has a horizontal split top blow shell machine, and a plurality of blowing ports 32 corresponding to the cavities of the mold 31 are provided on the lower surface of the blow head 30 for filling the foundry sand.
The blow plate 33 having is attached by the bolt 34. The blow head 30 is held at a predetermined portion via a spring 35, and is lowered against the spring force of the spring 35 due to the lowering of the pressure bonding head 36 located above the blow head 30. Then, when the pressure bonding head 36 descends, the blow head 30 is sandwiched between the lower surface of the pressure bonding head 36 and the upper surface of the mold 31, and the plurality of blow ports 32 of the blow head 30 are opposed to each other.
It is inserted in the casting sand blow hole 37 of 31. From this state, the air pump 38 connected to the crimping head 36 is operated and compressed air is supplied to the blow head 30 through the crimping head 36, so that the molding sand 39 in the blow head 30 is filled in the mold 31. However, it is molded as a main mold and a core. (As reference examples, there are JP-A-63-63551, JP-A-63-5849 and JP-A-63-5850) [Problems to be solved by the invention] However, in the conventional device, Since the blow plate 33 having the blowing port 32 corresponding to the blowing hole 37 of the mold 31 is attached and used, the blow plate 33 must be replaced every time the mold 31 is replaced. When replacing the blow plate 33, the bolt 34 is loosened, the blow plate 33 is removed from the blow head 30, and a new blow plate 33 is attached.

Therefore, during the replacement work, the foundry sand 39 remaining on the blow plate 33 flows out and scatters from around the blow plate 33,
It had the drawback of harming the environment.

On the other hand, if the blow head 30 is replaced together, it is possible to prevent the foundry sand from scattering, but the weight of the replacement portion becomes large and it is easy to interfere with the surroundings, so the work time required for replacement increases. The problem remains.

In solving these problems, the inventor of the present invention considered dividing the blow head at the optimum portion and completed the present invention.

Accordingly, an object of the present invention is to divide a blow head including a blow plate from a predetermined portion and replace the blow head along with the replacement of a mold so that the molding sand can be easily replaced without flowing out and scattering. It is intended to shorten the time.

[Means for Solving the Problems]

Therefore, the present invention is a casting for pressurizing the molding sand supplied into the blow head from its upper part and filling the cavity in the mold through the blow nozzle of the blow plate provided at the bottom of the blow head. In the sand blowing device, at least a part of the blow head is formed by reducing the diameter from the bottom side toward the upper end side, and the cross-sectional area of the upper end is formed smaller than the cross-sectional area of the bottom, and further, A guide inner cylinder for guiding the foundry sand is provided at the upper end of the blow head toward the inside of the blow head, and the blow head is located above the lower end of the guide inner cylinder, and the upper main head and the lower sub head are provided. The main head is provided with a clamp capable of holding the sub head.

[Operation] According to the above-mentioned means, when the blow plate is replaced with the replacement of the mold, the clamp provided on the upper main head is opened, so that the lower sub head having the blow plate is moved to the upper side. Remove from main head. At this time, since the sub head is divided at a portion above the lower end of the guide inner cylinder, the molding sand filled in the guide inner cylinder does not flow out and scatter from the divided portion of the sub head. After that, a new sub head having a blow plate corresponding to another mold is set on the main head, and the clamp of the main head is locked to the sub head, whereby the sub head is attached to the main head and the replacement work is completed.

On the other hand, when the mold sand is filled with this blow head after replacement, since the blow head is divided into the main head and the sub head, the filling pressure for filling the cast sand acts on the inner walls of the main head and the sub head. Force acts in a direction away from each other from the dividing surface, but at least a part of the blow head is reduced in diameter from the bottom side toward the upper end side, and the cross-sectional area of the upper end is cut off at the bottom. Since the area is smaller than the area, the force acting on the main head of the blow head is small, and the clamping force of the clamp for locking the main head and the sub head can be small.

〔Example〕

Next, an embodiment of a casting sand blowing device according to the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a casting sand blowing device.

The casting sand blowing device of the present embodiment is not shown, but the blow head is a casting sand feeding position for feeding the casting sand from the hopper and a casting sand filling position for filling the casting sand in the blow head into the mold. The present invention relates to a horizontal split top blow shell machine that reciprocates.

In FIG. 1, reference numeral 1 denotes a blow head, which has a sub head 3 formed by reducing its diameter from the bottom side toward the upper end side, and extends upward at the same width as the reduced diameter portion of the sub head 3 above the sub head 3. It is divided into a main head 2. The cross-sectional area of the upper end portion of the main head 2 is
Is formed to be smaller than the cross-sectional area of the bottom of the. Reference numeral 4 denotes a moving carriage that reciprocates between a molding sand supply position and a molding sand filling position by rollers. The moving carriage 4 supports the main head 2 by suspending a plurality of guide rods 5 attached to the main head 2 via springs 6. The upper end portion of the guide rod 5 is inserted into the guide rod hole 7 of the moving carriage 4 to allow the movement of the guide rod 5 in the axial direction, that is, the vertical movement of the main head 2. Against the left and right to prevent movement in the front-back direction. The main head 2 supported by the moving carriage 4 is provided with a clamp 8 for holding the sub head 3. The clamp 8 uses a cylinder 9 provided on the main head 2 as a drive source, and a clamp arm 11 is engaged with a clamped arm 12 provided on the sub head 3 via a pin 10. Reference numeral 13 denotes a positioning portion including a positioning pin 14 and a pin hole 15 for positioning the sub head 3 with respect to the main head 2.
Reference numeral 16 is a blow plate fixed to the bottom of the sub head 3 by a bolt, and has a jammer plate 18 at a position corresponding to the blow hole of the mold, and is a casting sand blow port made of an elastic material such as rubber.
Has 17. Numerals 19 and 20 are sealing materials, a dividing surface between the main head 2 and the sub head 3, and a casting sand blowing port.
Air leak between the mold 17 and the mold 21 is prevented respectively. 22 is a hopper for supplying the molding sand to the blow head 1. And at the bottom of the hopper 22,
A partition plate 25 that opens and closes the communication between the hopper 22 and the blow head body 1 is provided. The ring head 23 is mounted on the upper end of the main head 2 and the main head 2
Is a guide inner cylinder that is disposed inside and has a lower end portion formed to be longer than the dividing surface between the main head 2 and the sub head 3.

Next, the operation of the foundry sand blowing device will be described.

The partition plate 25 under the hopper 22 is closed with the replacement of the mold so that the molding sand 39 does not flow out from the hopper 22 to the blow head 1. After that, the blow head 1 is moved to a predetermined portion by the moving carriage 4, and the blow head 1 is placed on a vertically movable support base (not shown). In this state, the cylinder 9 is operated to open the clamp arm 11 to release the lock with the clamped arm 12 provided on the sub head 3. Then, the sub head 3 having the blow plate 16 is separated from the main head by lowering the support table. At this time, the foundry sand 39 in the guide inner cylinder 23 sequentially flows into the sub head 3, but does not flow over the upper surface of the sub head 3 to the outside. Then, the sub head 3 separated from the main head 2 on the support base is replaced with a new sub head 3 having a blow plate 16 corresponding to another mold 21. After that, the support base is raised and the positioning pin 14 of the sub head 3 is inserted into the pin hole 15 provided in the main head 2, and then the clamp arm 11 is locked to the clamped arm 12 by the cylinder 9 and the main head 2 is sub-headed. The replacement is completed by attaching.

On the other hand, when the mold sand is filled with the blow head 1 after the replacement, since the blow head 1 is divided into the main head 2 and the sub head 3, the pressure of the compressed air supplied for filling the mold sand is reduced. While acting on the inner walls of the main head 2 and the sub head 3, a force acts in a direction away from each other from the divided surfaces, the sub head 3 is reduced in diameter from the bottom side toward the upper end side, and Since the cross-sectional area of the upper end is small, the force acting on the main head 2 is small, and the clamp 8 for locking the sub head 3
The clamping force of is small.

From the above description, according to the present embodiment, the blow plate 16
The sub head 3 having the above can be easily replaced without scattering of foundry sand, but it can also be replaced automatically.

Further, when the mold sand is filled with the blow head 1 after the replacement, the sub head 3 is formed by reducing its diameter from the bottom side toward the upper end side, and the cross-sectional area of the upper end portion of the main head 2 is formed small. Since the force acting on the main head 2 due to the pressure of the compressed air supplied for filling the molding sand is small, the clamp force of the clamp 8 for locking the sub head 3 can be small, and the cylinder 9 or the like can be driven. The source can be miniaturized.

Although the specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are included within the scope of the claims of the utility model. is there.

[Effect of device]

As described above, according to the molding sand blowing device of the present invention, by dividing the blow head including the blow plate from a predetermined portion when the mold is replaced, the molding sand is easily replaced without flowing out or scattering. It is possible to shorten the working time.

Furthermore, when the molding sand is filled with the blow head after the replacement, at least a part of the blow head is reduced in diameter from the bottom side toward the upper end side, and the cross-sectional area of the upper end is changed to the cross-sectional area of the bottom. Since it is smaller than the above, the acting force on the upper end side of the blow head due to the filling pressure for filling the molding sand is small, so the clamping force of the clamp that locks the sub head is small, and the drive source such as the cylinder is It can be miniaturized.

[Brief description of drawings]

FIG. 1 is a sectional view of a casting sand blowing device according to the present invention. FIG. 2 is a sectional view of a casting sand blowing device according to a conventional example. 1 …… Blow head 2 …… Main head 3 …… Sub head 8 …… Clamp 16 …… Blow plate 17 …… Blowing port 23 …… Guide inner cylinder

Claims (1)

[Scope of utility model registration request] 1. A casting for pressurizing a molding sand supplied into a blow head from its upper part and filling the cavity in a mold through a blow nozzle of a blow plate provided at the bottom of the blow head. In the sand blowing device, at least a part of the blow head is formed by reducing the diameter from the bottom side toward the upper end side, and the cross-sectional area of the upper end is formed smaller than the cross-sectional area of the bottom, and further, A guide inner cylinder for guiding the foundry sand is provided at the upper end of the blow head toward the inside of the blow head, and the blow head is located above the lower end of the guide inner cylinder, and the upper main head and the lower sub head are provided. The casting sand blowing device is characterized in that the main head is provided with a clamp capable of holding the sub head.