TWI686248B - Malfunction prevention device of open and close valve for die casting - Google Patents

Abstract

In the present invention, there is provided a failure prevention device for an on-off valve for a die-casting part, which includes a gas removal path, a connection path communicating with the chamber on one or both sides of a fixed block movable block, and a slave pressure-bearing valve (bearing The pressure valve side) is connected to the main path of the closing valve (closing valve side), and is also provided with a pair of opposing branch paths and bypass paths formed by branching from the main path; wherein, the branch path includes: a first bypass path, Formed from one side; second bypass path, extended from the other side of the bypass path; cylindrical cross section, formed by the first bypass path and the second bypass path in the form of a cylindrical mesopore The end portion of is formed with a cylindrical cross; and, the confluence portion has a cylindrical space and extends from the lower side of the cylindrical intersection and communicates with the closing valve side.

Description

Device for preventing failure of on-off valve for die casting

The present invention relates to a failure prevention device for an on-off valve for die castings, and in particular to dust and the like generated when molten metal for die castings is thrown into a chamber by using vacuum pressure loaded from the closing valve side The impurities form a whirlpool vortex, so that it is possible to more effectively prevent impurities and the like from flowing into the on-off valve for die-casting parts and thus cause a failure prevention device for the on-off valve for die-casting parts.

Known gas removal devices for die castings include Japanese Patent Publication No. 2002-96151 and Japanese Patent Publication No. 2002-144008. As shown in FIGS. 1a and 1b, the conventional gas removal device for die castings is equipped with an exhaust passage 3 communicating with the chamber between the fixed block 1 and the movable block 2, and the fixed block 1 is equipped with The pressure-receiving valve 4 on the inlet side of the exhaust passage 3, the closing valve 5 disposed on the discharge side, and the opening and closing lever 6 that transmits the action of the pressure-receiving valve 4 to the closing valve 5 also include adding to the opening direction of the closing valve 5 Opening part 7 for pressure, closing part 8 for forcibly pressurizing the opening and closing lever 6 in the closing direction of the closing valve 5 during the initial operation of the mold in the cooling state, and also includes a solidification in the exhaust passage 3 when the mold is opened Excess materials such as aluminum inside are extruded to an extruded portion (not shown) outside. After starting casting, the molten metal will enter a chamber (not shown) and generate gas. The gas inside the chamber The body and air are discharged to the outside through the exhaust channel 3 while being sucked by the vacuum suction device, and the chamber will be filled with molten metal. At this time, when the molten metal enters the exhaust passage 3 from the inlet side of the gas removal device communicating with the chamber, the pressure of the molten metal will be applied to the upper side of the pressure receiving valve 4. As a result, the pressure-receiving valve 4 is pressed downward by the downward pressure in the direction of the arrow shown in FIG. 1b, thereby closing the closing valve 5 using the opening and closing lever 6 as a medium. At this time, although the gas can be discharged before closing, fine dust such as aluminum cannot be discharged and therefore stays at the front end of the closing valve 5. However, the conventional pressure-receiving valve 4 that is subject to the pressure of molten metal flowing from the inlet side of the gas removal device communicating with the chamber and the closing valve 5 that is closed by the opening and closing lever 6 may enter due to aluminum or other fine dust The gap between the two sliding parts 41, 51 of the two valves 4, 5 is contaminated, and when fine dust enters the gap between the two sliding parts 41, 51, it will not only cause the two valves 4, 5 The movement of is blocked, and at the same time, it also causes the problem that the work of the pressure-bearing valve 4 becomes slow, and thus eventually leads to a problem that the performance of the closing function of the closing valve 5 is degraded.

In order to solve the problems described above, in Japanese Patent No. 1723656, as shown in FIG. 2, the exhaust passage 3 of the gas removal device for die castings based on the vacuum suction device is provided at least on the side of the closing valve 5 The bypass path 32 is equipped with a continuous bend so that the arrival time of the molten metal passing through the bypass path 32 is later than the molten metal passing through the main path 31.

With the patent mentioned above, although the bypass path can be formed by bending and extending in a limited space, dust and the like flowing into the side of the closing valve can be intercepted to some extent, but when the flow speed of the molten metal is faster Or when the mold temperature of the die-casting part is excessively cooled, it may still cause foreign matter to flow into the closed valve side.

Therefore, there is an urgent need to develop a technology that can solve the above-mentioned conventional problems.

An object of the present invention is to provide a failure prevention device for an on-off valve for a die-casting part by using a vacuum pressure applied from the closing valve side to form a cyclone vortex, which can more effectively prevent impurities and the like from flowing into the on-off valve for a die-casting part.

In the present invention, there is provided a failure prevention device for an on-off valve for die-casting parts, which includes a gas removal path, a connection path communicating with the chamber and a pressure-receiving valve on one or both sides of a fixed block or a movable block. (Pressure-bearing valve side) connected to the main path of the shut-off valve (closed valve side), also equipped with a pair of opposing branch paths and bypass paths branched from the main path; where the branch path includes: a first bypass path , Extended from one side; the second bypass path, extended from the other side of the bypass path; the cylindrical intersection, formed by the first bypass path and the second bypass in the form of a cylindrical middle hole The end of the path is formed in a cylindrical cross; and, the confluence part has a cylindrical space and extends from the lower side of the cylindrical cross and is communicated with the closing valve side.

Among them, under the action of the vacuum pressure applied to the shut-off valve located on the shut-off valve side, the molten metal containing foreign matter that flows in through the first bypass path and the second bypass path, respectively, has a cylindrical mesopore On the cylindrical cross section, it is preferable to use the cylindrical middle hole as a reference point to flow in from opposite directions, respectively.

In addition, it is preferable to provide a cylindrical confluence portion corresponding to the outer peripheral edge of the cylindrical intersection below the cylindrical intersection with a cylindrical mesopore.

In addition, the confluence section communicates below the cylindrical intersection forming the mesopore with a surface area larger than the surface area of the cylindrical intersection, so that the mesopore of the cylindrical intersection can be maintained more smoothly Whirlpool formed by dots.

In addition, in order to make the area where the first bypass path and the second bypass path meet smaller than other cross-sectional areas, it is preferable to provide a bay-shaped concave groove (not shown) on the upper side of the cylindrical intersection.

The present invention can effectively prevent impurities and the like from flowing into the on-off valve for die casting by forming a cyclone vortex by using the vacuum pressure applied from the side of the closing valve.

1: fixed block

2: movable block

3: Exhaust channel

4: Pressure valve

4A: Pressure valve side

5: Close the valve

5A: Close the valve side

6: Opening and closing lever

7: Open Department

8: Close Department

10: connection path

20: main path

30: branch path

31: Main path

32: Bypass path

40: Bypass path

41: Sliding part

42, 42a: the first bypass path

44: Second bypass path

44a: Second bypass path

46: Cylindrical intersection

46A: Cylindrical medium hole

48: Confluence

51: sliding part

101a: Pressure-side gas channel

101b: blocking the side gas channel

101: Gas transmission path

102: On-off valve

Fig. 1a is a schematic diagram illustrating main parts of a conventional gas removal device for die castings.

Fig. 1b is a cross-sectional view illustrating main parts of a conventional gas removal device for die castings.

Fig. 2 is a schematic diagram illustrating main parts of Patent No. 1723656.

Fig. 3 is a partial cross-sectional view illustrating the opening and closing valve portion of the failure prevention device to which the opening and closing valve for die casting according to the preferred embodiment of the present invention is applied.

Fig. 4 is a schematic perspective view illustrating the paths of molten metal of the fixed block and the movable block of the failure prevention device to which the on-off valve for die casting according to the preferred embodiment of the present invention is applied.

FIG. 5 is a schematic exploded perspective view for explaining the flow of molten metal inside the dotted circle in FIG. 4.

Next, the failure prevention device to which the on-off valve for die casting of the preferred embodiment of the present invention is applied will be described in detail with reference to the drawings.

FIG. 3 is a partial cross-sectional view illustrating the opening and closing valve portion of the failure prevention device for the on-off valve for die casting according to the preferred embodiment of the present invention, and FIG. 4 is a die casting for the preferred embodiment of the present invention. The schematic block diagram of the molten metal path of the fixed block and the movable block of the failure prevention device of the on-off valve for a piece is shown in FIG. 5, and FIG. 5 is for explaining the flow of the molten metal inside the dotted circle in FIG. 4. A schematic exploded oblique view.

As shown in FIGS. 3 to 5, the failure prevention device for the on-off valve for die castings according to the preferred embodiment of the present invention is the same as the conventional technology, and a chamber is provided between the fixed block 1 and the movable block 2 The communicating exhaust passage 3 is provided with a pressure-receiving valve 4 arranged on the inlet side of the exhaust passage 3, a shut-off valve 5 arranged on the discharge side, and transmitting the action of the pressure-receiving valve 4 to the shut-off valve 5 on the fixed block 1的开开关杆6。 The opening and closing lever 6.

In addition, it also includes an opening portion 7 that pressurizes the opening direction of the closing valve 5, a closing portion 8 that forcibly pressurizes the opening and closing lever 6 in the closing direction of the closing valve 5 during the initial operation of the mold in a cooled state, and uses When opening the die, the remaining material such as aluminum solidified inside the exhaust passage 3 is extruded to an extruded portion (not shown) outside.

After starting the casting of the die-casting part, the molten metal can enter a chamber (not shown) and generate gas. At this time, the gas and air located inside the chamber are discharged to the outside through the exhaust passage 3 while being sucked by the vacuum suction device (not shown), and the chamber is filled with molten metal. At this time, when molten metal enters the exhaust passage 3 from the inlet side of the gas removal device communicating with the chamber (the left arrow in FIG. 3 ), the pressure of the molten metal is applied to the upper side of the pressure-receiving valve 4. As a result, the pressure-receiving valve 4 is pressed by the downward pressure, thereby closing the closing valve 5 using the opening and closing lever 6 as a medium.

In addition, as the gas removal path, a connection path 10 communicating with the chamber is provided on one or both sides of the fixed block 1 or the movable block 2 and a connection from the pressure valve 4 (pressure valve side 4A) to the closing valve 5 ( The main path 20 that closes the valve side 5A) is also provided with a pair of opposing branch paths 30 and bypass paths 40 that branch off from the main path 20.

The failure prevention device for the on-off valve for die castings according to the preferred embodiment of the present invention is different from the conventional technology. As shown in FIGS. 4 and 5, the bypass path 40 includes: a first bypass path 42, The second bypass path 44 is extended from the other side of the bypass path 40; the cylindrical intersection 46 is formed in the form of a cylindrical middle hole 46A by the first bypass path 42 and The end of the second bypass path 44 is formed in a cylindrical cross; and the junction 48 has a cylindrical space and extends from the lower side of the cylindrical cross 46 to communicate with the closing valve side 5A.

In the failure prevention device to which the on-off valve for die casting of the preferred embodiment of the present invention is applied, the bypass path 40 is composed of the first bypass paths 42a, 42 and the second bypass path 44a formed by bending in two stages, respectively. 44 Composition.

In the failure prevention device to which the on-off valve for die casting of the preferred embodiment of the present invention is applied, the first bypass path 42 and the vacuum pressure applied to the shut-off valve 5 on the shut-off valve side 5A The molten metal containing foreign substances flowing into the second bypass path 44 respectively flows into the cylindrical intersection 46 having the cylindrical middle hole 46A from the opposite direction with the cylindrical middle hole 46A as a reference point.

Because the vacuum pressure applied from the closing valve 5 will be along the inner circumferential surface of the cylinder in the opposite direction on the cylindrical cross section 46 having the cylindrical center hole 46A with the cylindrical center hole 46A as the reference point As shown in FIG. 5, the molten metal containing foreign matter forms a cyclone vortex on the cylindrical cross section 46 with the cylindrical middle hole 46A as a reference point, whereby the foreign matter contained from the main path 20 can flow in The molten metal is induced into the first and second bypass paths 42, 44 more quickly and smoothly than the branch path 30, thereby preventing the closing valve 5 from malfunctioning more effectively.

In addition, below the cylindrical intersection 46 having the cylindrical middle hole 46A, a cylindrical junction 48 corresponding to the outer periphery of the cylindrical intersection 46 is provided, with a surface area larger than that of the cylindrical intersection The surface area of 46 communicates with the cylindrical cross section 46 having the middle hole 46A, so that the cyclone vortex formed with the middle hole 46A of the cylindrical cross section 46 as a reference point can be maintained more smoothly.

As described above, in the failure prevention device to which the on-off valve for die casting according to the preferred embodiment of the present invention is applied, since the confluence portion 48 communicates with the circle having the middle hole 46A in the form that its surface area is larger than the surface area of the cylindrical intersection 46 Below the cylindrical intersection 46, it is possible to more smoothly maintain the whirlpool vortex formed with the middle hole 46A of the cylindrical intersection 46 as a reference point, whereby the molten metal containing foreign matter can be moved faster than the branch path 30 and The first and second bypass paths 42 and 44 are smoothly induced.

As described above, in the failure prevention device to which the on-off valve for die casting according to the preferred embodiment of the present invention is applied, by intersecting the first bypass path 42 and the second bypass path 44 of the bypass path 40 The formation of a cyclone vortex, the foreign matter generated at the beginning of die casting, etc., can flow on the bypass path 40 having a longer path more quickly than the branch path 30. Thereby, during the casting period of the die-casting part, the molten metal containing foreign materials can be sufficiently induced to the bypass path 40, and thereby effectively prevent foreign materials from flowing into the closing valve 5 due to the molten metal or the like flowing through the branch path 30 Phenomenon.

In the failure prevention device to which the on-off valve for die castings according to the preferred embodiment of the present invention is applied, in order to make the area where the first bypass path 42 and the second bypass path 44 meet smaller than other cross-sectional areas, they cross in a cylindrical The upper side of the portion 46 is also provided with a bay-shaped concave groove (not shown).

As described above, by forming a groove recessed in a bay shape in a form smaller than other cross-sectional areas in the area where the first bypass path 42 and the second bypass path 44 are in contact, it is possible to form The vector displacement that flows into the junction 48 more smoothly on the cylindrical intersection 46 of the hole 46A.

The above examples of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those with ordinary knowledge in the field, other different forms of changes or changes can be made on the basis of the above description. It is not possible to exhaustively list all implementations here. Any obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

4A: Pressure valve side

5A: Close the valve side

10: connection path

20: main path

30: branch path

40: Bypass path

42, 42a: the first bypass path

44: Second bypass path

44a: Second bypass path

46: Cylindrical intersection

46A: Cylindrical medium hole

48: Confluence

Claims (6)

A failure prevention device for an on-off valve for die-casting parts consists of an exhaust channel (3) communicating with the chamber between the fixed block (1) and the movable block (2), The pressure-bearing valve (4) on the inlet side of the gas passage (3), the closing valve (5) arranged on the discharge side, and the action of the pressure-bearing valve (4) are transmitted to the opening and closing lever (6) of the closing valve (5), And a vacuum device (not shown) for applying vacuum pressure to the shut-off valve (5), which includes: a gas removal path, and is provided on one or both sides of the fixed block (1) or the movable block (2) with The connecting path (10) to the chamber and the main path (20) from the pressure valve (4; pressure valve side (4A)) to the shut-off valve (5; shut-off valve side (5A)) are also equipped with A pair of opposing branch paths (30) and bypass paths (40) formed by the main path (20) branches; wherein, the bypass path (40) includes: a first bypass path (42), which extends from one side ; The second bypass path (44), formed from the other side of the bypass path (40) extended; a cylindrical intersection (46), in the form of a cylindrical middle hole (46A) by the first bypass The ends of the path (42) and the second bypass path (44) are formed in a cylindrical cross; and, the confluence part (48) has a cylindrical space from the lower side of the cylindrical cross (46) The extension is formed and communicates with the closing valve side (5A). A failure prevention device for an on-off valve for die casting as described in item 1 of the patent application scope, in which: the vacuum pressure applied to the shut-off valve (5) on the shut-off valve side (5A) Under the action of the first bypass path (42) and the second bypass path (44), the molten metal containing foreign matter flowing into the cylindrical cross section (46) having the cylindrical meso hole (46A) The upper part uses the cylindrical middle hole (46A) as a reference point to flow in from opposite directions, respectively. A failure prevention device for an on-off valve for die castings as described in item 2 of the patent application scope, wherein: below the cylindrical cross section (46) having a cylindrical middle hole (46A), a cylinder cross is provided A cylindrical junction (48) corresponding to the outer periphery of the portion (46). The failure prevention device for an on-off valve for die castings as described in item 3 of the patent application, wherein the junction (48) communicates with a mesopore in the form of a surface area greater than the surface area of the cylindrical intersection (46) 46A) below the cylindrical intersection (46), so that the cyclone formed by using the middle hole (46A) of the cylindrical intersection (46) as a reference point can be maintained more smoothly. The failure prevention device for an on-off valve for die castings according to any one of the first to fourth patent application ranges, wherein: the bypass paths (40) are respectively formed by a first bypass path formed by two-stage bending (42a, 42) and the second bypass path (44a, 44) constitute. The failure prevention device for an on-off valve for die casting as described in item 5 of the patent application scope, wherein: in order to make the area where the first bypass path (42) and the second bypass path (44) meet is smaller than other cross-sectional areas, A bay-shaped concave groove (not shown) is also provided on the upper side of the cylindrical intersection (46).

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