JP3097975B2 - Gate cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold gate cleaning apparatus, and more particularly to a mold gate cleaning apparatus provided above a mold conveying line.

[0002]

2. Description of the Related Art There are roughly two methods for molding a gate of a mold to be molded by a molding machine. One method is a squeezing step of molding, and the other method is in the middle of a mold conveying line after molding. Is what you do. In the former method,
Attach a sprue cup model that has the shape of a sprue at the appropriate place on the lower surface of the squeeze plate and has a vertical through hole at the center,
Also, a sprue bar is attached vertically to a position corresponding to the sprue cup model on the upper surface of the model surface plate, and after casting sand is poured into the casting frame, a squeezing step is performed to insert the sprue bar into the through hole of the sprue cup model. The gate is formed after the die is removed. In the latter method, the gate is not formed by a molding machine, but the casting gate filled in the casting frame is cut from the upper surface of the mold by a motor-driven cutter in the middle of the mold transfer line to form the gate.

[0003]

However, when the gate is formed in the squeezing step of molding, the fitting portion between the gate cup model and the gate is gradually worn, and a gap is formed in the fitting portion. Occurs, casting sand enters into this gap when sand is filled,
A flash of sand 34a as shown in FIG. 4 is generated on the molding surface of the gate. If this sand mass 34a is left as it is, it will be caught in the molten metal at the time of pouring, and it will cause sanding of the casting product. In addition, when the gate is formed in the middle of the mold transfer line, the sand particles peeled off by cutting are loosely attached to the cutting surface in a loose state, and are similarly caught in the molten metal when pouring, It causes the occurrence. Conventionally, as a countermeasure, the sand or the attached sand particles is pressed by a palm of a worker, cut off with a motor-driven cutter, or blown with compressed air. However, in any case, it is not possible to cope with the increase in the speed of the equipment and the shortage of the labor force, and an appropriate solution is required.

In particular, when blowing with compressed air, if the nozzle is fixed, every time the position of the gate changes,
The mounting position must be changed, and sand is scattered around the surroundings, thereby deteriorating the working environment.

Further, when a gate is formed in a squeezing process, the position of the gate differs depending on the type of casting product.
Each time the model is replaced, it is necessary to change the mounting position of the sprue cup model on the squeeze plate, and there is a problem that the replacement work is troublesome and the operation rate is reduced due to the suspension of the operation of the molding apparatus.

[0006]

In order to solve the above-mentioned problems, a sprue cleaning apparatus according to the present invention includes a vertically moving movable portion fixed to a frame located above a mold conveying line and having a vertically movable operating portion. Means, a frame fixed horizontally to the operating portion of the elevating means and capable of moving up and down, a plurality of rods supported slidably up and down by the frame, and vertically movably supported by the frame, and A plurality of blow cups which are provided around each of the rods so as to be slidable up and down and form airtight tubular spaces between the rods and the outer peripheral surface of the rods. The blow cup has a compressed air supply port for supplying compressed air into the tubular space on a wall forming the tubular space, and a lower end surface is open at a lower end of the tubular space. Being on the mold A nozzle portion that can be brought into airtight contact with the outer periphery of the sprue cup provided in the nozzle, and a nozzle that introduces air supplied from the compressed air supply port into the cylinder portion through the tubular space. The compressed air supply port is opened when the insertion portion of the rod is lowered and inserted into the gate hole of the mold, and the lower end surface of the cylindrical portion of the blow cup is in contact with the outer periphery of the gate cup. The compressed air supplied from the nozzle is discharged from the nozzle into the sprue cup to clean the inner surface of the sprue cup.

In the sprue cleaning apparatus according to the present invention, each of the rods has an annular concave portion in the middle of the longitudinal direction, and the compressed air supply port of each of the blow cups is located above a wall surface forming the tubular space. Provided, and each of the blow cups has an annular seal member for sealing between the outer peripheral surface of the rod and the middle of the tubular space in the longitudinal direction, and the insertion part of the rod descends to the spout hole of the mold. In a state where the annular concave portion of the inserted rod is opposed to the annular seal member of the blow cup, the compressed air is supplied from the compressed air supply port through a gap between the annular concave portion of the rod and the annular seal member of the blow cup. Compressed air may be discharged from the nozzle into the sprue cup to clean the inner surface of the sprue cup.

[0008]

The gate cleaning device of the present invention has a plurality of fixed nozzles for discharging compressed air. When the gate of the mold comes directly below, the gate hole is detected by the lowering position of the rod, and the gate is blown. In a state where the lower end surface of the cylindrical portion of the cup is in air-tight contact with the outer periphery of the mold gate cup, compressed air is automatically released only from a specific nozzle to clean the inside of the gate. For this reason, a plurality of sprue cup models can be attached to the squeeze plate in advance, and a sprue is formed by selecting an appropriate sprue cup model according to the target mold and connecting with the sprue hole. Only certain gate cups are cleaned. Therefore, there is no need to replace the sprue cup model for each type of casting product, which not only saves labor and improves the operation rate of the molding equipment, but also prevents the scattering of sand by compressed air, improving the working environment. You.

Further, an annular concave portion is provided on the outer peripheral surface of the rod,
If an annular seal member is provided on the inner wall surface of the blow cup and the lower position of the rod performs the function of a valve for the compressed air supplied to the nozzle, the on-off valve and the position detecting device for the rod are separately provided. There is no need to install equipment.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, a sluice cleaning device according to the present invention comprises an elevating means 1 and a frame 3 which is horizontally fixed to the lower ends of a pair of guide bars 2 of the elevating means 1 and which can move up and down.
And three rods 4 supported on the frame 3 so as to be slidable up and down, and an outer periphery of the rod 4 supported on the frame 3 so as to be movable up and down and slidably mounted on each rod 4 so as to be slidable up and down. And three blow cups 6, each of which forms an airtight tubular space 5 with the surface.

The lifting / lowering means 1 includes a cylinder 8 vertically fixed on a frame 7 located above and along a mold transport line (not shown), and a piston (not shown) slidably fitted in the cylinder 8. A piston rod 9 fixed to the upper side of the cylinder 8 and extending vertically upward through an upper end face of the cylinder 8 in a slidable manner in an airtight manner; a connector 10 fixed to the upper end of the piston rod 9 horizontally; And a pair of guide bars 2 which are fixed to both ends and extend vertically downward and slidably pass through respective guide holes 11 provided in the frame 7 in the vertical direction.

Each rod 4 extends vertically downward through a guide hole 12 provided in the frame 3 so as to be slidable up and down, but is supported by a stopper 13 provided at the upper end so as not to fall off the frame 3. Have been. Each of the rods 4 has an annular recessed portion 14 substantially at the center in the longitudinal direction, and an insertion portion 1 having a small diameter at a lower end and capable of being inserted into a gate hole of a mold.
5 are provided.

Each blow cup 6 has a stopper 16 at its upper end.
And is supported so as not to fall off from the frame 3. In each blow cup 6, a compressed air supply port 17 for supplying compressed air into the tubular space 5 is provided above a wall surface forming the tubular space 5, and a rod 4 is provided in the middle of the wall surface in the longitudinal direction. Annular sealing member 1 for sealing between the outer peripheral surface
8 are provided. The lower end of each blow cup 6 forms a cylindrical portion 19 having a large diameter. The cylindrical portion 19 includes an upper lid portion 20 and a lower cup portion 21. A hole 22 is provided at the center of the lid 20 for inserting the insertion portion 15 of the rod 4, and an inner upper surface 23 of the lid 20 forms a bottom surface of the tubular space 5 and has a large diameter at the top of the rod 4. Also serves as a seat for receiving parts. The lid 20 is provided with an air conduit 24 for guiding compressed air from the tubular space 5 to the lower surface of the lid 20, and a nozzle 25 is attached to a tip of the air conduit 24. To the upper end of the blow cup 6 and the lid 20, annular seal members 26 and 27 for preventing leakage of compressed air between the rod 4 and the lid 4 are attached, respectively. The cup portion 21 is for covering the outer periphery of the sprue cup formed on the upper surface of the mold, and an annular seal member 28 for preventing leakage of compressed air is attached to a lower end in contact with the upper surface of the mold.

The compressed air supply port 17 of each blow cup 6
Is connected to a compressed air source 30 via a pressure reducing valve 29. Although not shown, upper and lower chambers in the cylinder 8 of the lifting / lowering means 1 are connected to a compressed air source via a switching valve and a pressure reducing valve, respectively.

FIG. 1 shows a state in which a mold 31 molded by a molding machine (not shown) is transported on a transport line to a position immediately below a main gate cleaning device.
Reference numeral 35 denotes a casting frame, a sand mold, a gate cup, and a gate hole.

Next, the operation of the gate cleaning device will be described. First, FIG. 1A shows a case in which neither the sprue cup nor the sprue hole is provided on the upper surface of the mold 31, and the frame 3 descends so that the tip of the insertion portion 15 of the rod 4 comes into contact with the upper surface of the sand mold 33, Stops descending at this position. Frame 3
Is slidable with the rod 4, the frame 3 continues to descend as it is, and when the annular sealing member 28 at the tip of the blow cup 6 contacts the upper surface of the sand mold 33, the blow cup 6 descends at this position. To stop. Frame 3 continues to descend. In this state, as shown in FIG. 3A, the compressed air introduced from the compressed air supply port 17 is moved to this position by the sealing action between the outer peripheral surface of the rod 4 and the annular sealing member 18 of the blow cup 6. It is stopped by.

FIG. 1B shows a case where there is a sprue cup on the upper surface of the mold 31 but no sprue hole, and the frame 3 descends so that the tip of the insertion portion 15 of the rod 4 comes into contact with the bottom surface of the sprue cup 34. , Rod 4 stops descending at this position. The frame 3 continues to descend as it is, and when the annular seal member 28 at the tip of the blow cup 6 comes into contact with the upper surface of the sand mold 33, the blow cup 6 stops descending at this position. Frame 3
Keeps descending. Also in this state, the compressed air introduced from the compressed air supply port 17 is blocked at this position by the sealing action between the rod 4 and the annular seal member 18 as shown in FIG. 3B.

FIG. 1C shows a case where both the sprue cup 34 and the sprue hole 35 provided on the bottom surface of the sprue cup 34 are provided on the upper surface of the mold 31. Is inserted into the gate hole 35. Frame 3
Continues to descend, and when the annular seal member 28 at the tip of the blow cup 6 comes into contact with the upper surface of the sand mold 33, the blow cup 6 stops descending at this position, and then the frame 3
Also stops descending. As described above, even if the blow cup 6 stops descending, the frame 3 is set so as to be able to descend slightly further, so that no gap is formed between the upper surface of the sand mold 33 and the lower end surface of the blow cup 6. . In this state, as shown in FIG. 3C, the rod 4 is locked by the upper surface 23 of the lid 20 of the cylindrical portion 19 of the blow cup 6, and the annular concave portion 14 of the rod 4 is Since it comes to a position facing 18, an annular gap 1
4a is formed, and the compressed air introduced from the compressed air supply port 17 passes through the gap 14a, passes through the lower part of the tubular space 5, passes through the air conduit 24, and is discharged from the nozzle 25. Clean the inside. In this case, no compressed air leaks from between the lower surface of the annular seal member 28 of the blow cup 6 and the upper surface of the sand mold 33.

In the above embodiment, the insertion portion 15 of the rod 4
The function of the valve for preventing the discharge of the compressed air from the nozzle 25 when the nozzle is not inserted into the sprue hole 35 depends on the relative position between the annular concave portion 14 of the rod 4 and the annular seal member 18 of the blow cup 6. However, the vertical position of the rod 4 is detected from the outside, and this is transmitted to an open / close valve installed outside the main body of the apparatus by an electric signal or an air signal to open and close the valve. It may be.

The number of rods 4 or blow cups 6 is not limited to three, and the cylindrical portion 19 of blow cup 6 is not limited to three.
The opening at the lower end is not limited to a circular shape, but may be any shape corresponding to the shape of the gate cup.

As is clear from the above description, in the sprue cleaning apparatus of the present invention, the positions of the plurality of nozzles for discharging compressed air are fixed, and the sprue holes provided in the mold located directly below the spout are connected to the rod. Detected by the descending position of
Compressed air is automatically discharged only from the nozzle corresponding to this to clean the inner surface of the gate. Therefore, the squeeze plate is used with a plurality of sprue cup models attached, and when the type of mold changes, an appropriate sprue cup model is selected and used, and the squeeze plate is connected to the sprue hole. I just need. For this reason, it is not necessary to change the position of the sprue cup model depending on the type of the casting product, and the work for this replacement can be omitted, and a decrease in the operation rate of the molding apparatus can be prevented. Thus, according to the present sprue cleaning device, not only can labor saving and improvement of the operation rate of the device be achieved, but also the discharge of compressed air from the nozzle is performed in a state where the lower end surface of the blow cup is in close contact with the upper surface of the sand mold. Will be done,
The work environment can be improved by preventing the scattering of sand.

[Brief description of the drawings]

FIG. 1 is a schematic elevation view showing a state before an operation of an embodiment of a gate cleaning device of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the embodiment shown in FIG.

FIG. 3 is a longitudinal sectional view showing an operation state of the embodiment shown in FIG. 1;

FIG. 4 is a schematic longitudinal sectional view of a mold showing sand particles formed on a molding surface of a gate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevating means 2 Guide bar (operating part) 3 Frame 4 Rod 5 Tubular space 6 Blow cup 7 Frame 14 Annular concave part 15 Insertion part 17 Compressed air supply port 18 Annular seal member 19 Cylindrical part 25 Nozzle 31 Mold 34 Faucet cup 35 Faucet hole

Claims (2)

(57) [Claims] 1. A vertically moving means fixed to a frame located above the mold conveying line and having a vertically movable operating part, and a frame horizontally fixed to the operating part of the vertically moving means and capable of vertically moving up and down. A plurality of rods supported slidably up and down on the frame, and an outer peripheral surface of the rods movably supported up and down on the frame and slidably mounted on the rods up and down. A plurality of blow cups each forming an airtight tubular space between the rods, each of the rods has an insertion portion at a lower end thereof that can be inserted into a gate hole of a mold, and each of the blow cups forms the tubular space A compressed air supply port for supplying compressed air into the tubular space on the wall surface and a cylindrical portion having a lower end surface opened at the lower end of the tubular space and capable of airtightly contacting an outer periphery of a sprue cup provided on the upper surface of the mold. And this tube has A nozzle for introducing the air supplied from the compressed air supply port into the cylindrical portion through the tubular space is opened, and the insertion portion of the rod is lowered to be inserted into the sprue hole of the mold; In a state where the lower end surface of the cylindrical portion of the cup is in contact with the outer periphery of the sprue cup, the compressed air supplied from the compressed air supply port is discharged from the nozzle into the sprue cup to clean the inner surface of the sprue cup. Gate cleaning device consisting of: 2. Each of the rods has an annular recess in the middle of the longitudinal direction, a compressed air supply port of each of the blow cups is provided at an upper part of a wall surface forming the tubular space, and each of the blow cups is At the middle of the longitudinal direction of the tubular space, there is an annular seal member for sealing between the outer peripheral surface of the rod and the insertion part of the rod is lowered and inserted into the sprue hole of the mold, and the annular concave part of the rod is In a state facing the annular seal member of the blow cup, the compressed air supplied from the compressed air supply port through the gap between the annular concave portion of the rod and the annular seal member of the blow cup flows from the nozzle into the sprue cup. 2. The sprue cleaning device according to claim 1, wherein the spout is released to clean the inner surface of the sprue cup.