A vacuum exhaust valve for casting

Abstract

The present invention discloses a vacuum exhaust valve for casting; it comprises a moving valve housing, a static valve housing, a push rod, a trigger valve core, a sealing valve core and a spoiler; the upper end surface of the moving valve housing is provided with a flow channel, the interior of the moving valve housing is provided with a first mounting hole and a second mounting hole connected to the flow channel, the trigger valve core is installed in the first mounting hole, and the sealing valve core is installed in the second mounting hole; the moving valve housing is also provided with a third mounting hole, the push rod is installed in the third mounting hole, and the third mounting hole is located between the first mounting hole and the second mounting hole, and the first mounting hole is close to the liquid inlet of the flow channel; the lower end surface of the static valve housing is provided with a groove corresponding to the flow channel, the middle part of the spoiler is hinged in the groove, and the trigger end of the spoiler contacts the upper end of the trigger valve core and the force-bearing end of the spoiler is close to the liquid inlet of the flow channel. The present invention optimizes the flow channel structure, improves the power of pushing the trigger valve core, and is conducive to improving the casting yield.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a vacuum exhaust valve for casting. Background Art

[0002] Pressure casting refers to a casting method in which molten or semi-molten metal is injected into a metal mold at high speed and crystallized under pressure, referred to as die casting. The commonly used injection pressure is 30-70 MPa, and the filling speed is about 0.5-50 m / s. The die-casting mold includes a mold fixed mold and a mold movable mold. After the mold movable mold is covered on the mold fixed mold and closed with the mold fixed mold, a mold gate, a mold cavity and a mold overflow groove are formed between the mold fixed mold and the mold movable mold. The mold movable mold is also provided with a pressure chamber. When the molten alloy fills the die-casting mold cavity, there are other gases such as ordinary air and gases generated by the volatilization of the release agent in the mold cavity. If these gases cannot be discharged from the cavity, the quality of the finished product will be affected. Therefore, it is necessary to connect an exhaust valve for exhaust at the end of the mold overflow groove.

[0003] The patent with announcement number CN214888876U discloses a casting exhaust vacuum valve, which includes a movable valve housing, a static valve housing, a trigger valve core and a sealing valve core; it also includes a connecting disk connected to the trigger valve core and the sealing valve core, and the trigger valve core is pushed by the metal liquid to drive the connecting disk and the sealing valve core, so that the sealing valve core blocks the exhaust hole; the interior of the movable valve housing is provided with two first sliders in contact with the conical end of the trigger valve core, the two first sliders are respectively provided with protrusions in contact with the connecting disk, and the connecting disk is provided with two limiting holes, each limiting hole is located next to a protrusion; the middle part of the trigger valve core is provided with a limiting disk and the connecting disk is provided with a limiting groove corresponding to the limiting disk; the movable valve housing is provided with a tightening component for tightening the connecting disk to the two protrusions.

[0004] The above-mentioned exhaust vacuum valve adopts a structure in which a tightening component and a trigger valve core push the sealing valve core together, which reduces the kinetic energy of the metal liquid required to push the valve core, increases the acceleration of the vacuum valve core during closing action, and also reduces the probability of the vacuum valve core getting stuck. However, it still has shortcomings: since the first slider and the connecting plate are both tightened under the push rod, the friction resistance between the first slider and the connecting plate is relatively large, and the trigger valve core needs a sufficiently large pressure to push the first slider. Since the flow channel is a straight-through type without an obstruction structure, a small amount of molten alloy will first flow to the trigger valve core during the exhaust process, but this small amount of molten alloy cannot push the trigger valve core, so there is also the problem of being unable to close the exhaust vacuum valve, which will also cause the molten alloy to overflow and affect product quality. Summary of the invention

[0005] In view of the defects in the prior art, the flow channel structure is optimized, the power for pushing the trigger valve core is increased, and the number of defective products is reduced. The present invention provides a vacuum exhaust valve for casting; it includes a moving valve housing, a static valve housing, a push rod, a trigger valve core, a sealing valve core and a spoiler; the upper end surface of the moving valve housing is provided with a flow channel, the interior of the moving valve housing is provided with a first mounting hole and a second mounting hole connected to the flow channel, and the trigger valve core is installed in the first mounting hole, and the sealing valve core is installed in the second mounting hole; the moving valve housing is also provided with a third mounting hole, the push rod is installed in the third mounting hole, and the third mounting hole is located between the first mounting hole and the second mounting hole, and the first mounting hole is close to the liquid inlet of the flow channel; the lower end surface of the static valve housing is provided with a groove corresponding to the flow channel, the middle part of the spoiler is hinged in the groove, and the trigger end of the spoiler is in contact with the upper end of the trigger valve core and the force-bearing end of the spoiler is close to the flow channel The liquid inlet of the flow channel is provided with a guide plate bent toward the liquid inlet of the flow channel, and the end of the guide plate is adjacent to the force-bearing end of the spoiler, and the molten alloy passes between the guide plate and the spoiler, so that the trigger end that pushes the spoiler squeezes the trigger valve core; the interior of the movable valve housing is provided with a linkage plate adapted to the lower part of the trigger valve core, and two trigger plates adapted to the lower end of the trigger valve core; the linkage plate is provided with two opposite positioning holes, and each trigger plate is provided with a boss adapted to the positioning hole; the linkage plate is pressed between the push rod and a trigger plate, and the edge of the linkage plate is connected to the sealing valve core, and the trigger valve core moves downward and pushes the bosses of the two trigger plates to move into the corresponding positioning holes, so that the push rod pushes the linkage plate to drive the sealing valve core to move downward and seal the flow channel.

[0006] The beneficial effect of the device is that the cross-sectional area of ​​the flow channel near the liquid inlet is reduced by the spoiler and the guide plate, and even a small amount of molten alloy flowing through the structure will push the force-bearing end of the spoiler to swing upward, and at the same time the trigger plate swings down and squeezes the trigger valve core to move downward, and the corresponding bosses of the two trigger plates move to the corresponding positioning holes, and the balance between the push rod, the linkage plate and the trigger plate is broken. Under the downward pressure of the push rod, the linkage plate and the sealing valve core are pushed downward, and the sealing valve core blocks the flow channel after moving downward, thereby achieving flow channel sealing. Compared with the existing vacuum exhaust valve, the sealing valve core that cannot be pushed downward by a small amount of molten alloy originally, but the spoiler uses the principle of lever to amplify the kinetic energy of the flowing small amount of molten alloy to push the sealing valve core downward, that is, to increase the power to push the trigger valve core, improve the sensitivity of the vacuum exhaust valve, and help to improve the casting yield.

[0007] Preferably, a drain port is provided on the side of the movable valve housing, and the drain port is connected to the side of the second mounting hole. The second mounting hole is provided with a sliding sleeve, and the sealing valve core is slidably connected in the sliding sleeve, and a through hole corresponding to the drain port is provided on the side of the sliding sleeve, and the sealing valve core is moved downward so that the upper end of the sealing valve core blocks the sliding sleeve, thereby sealing the flow channel. A reset hole opposite to the lower end of the sealing valve core is provided inside the movable valve housing, and a first spring in contact with the lower end of the sealing valve core is provided in the reset hole. Before the trigger valve core is activated, that is, before it is sealed, the elastic force of the first spring is needed to lift the sealing valve core, so that the flow channel is unobstructed, and the gas can be discharged in time.

[0008] Preferably, an elastically deformable diaphragm is provided between the force-bearing end and the groove, and the gap between the spoiler and the groove is sealed by the diaphragm. After the gap between the spoiler and the groove is sealed, the molten alloy can only flow through the space between the spoiler and the guide plate, so the molten alloy will inevitably push the spoiler to rotate counterclockwise, ensuring the uniqueness of the linkage and low failure rate of the vacuum exhaust valve.

[0009] Preferably, a portion of the spoiler near the liquid inlet is in the shape of an arc-shaped sheet, and the remaining portion of the spoiler is in the shape of a straight rod, and the spoiler of the straight rod is in contact with the trigger valve core. The arc-shaped sheet near the force-bearing end increases the contact area with the molten alloy, and the flowing molten alloy can completely impact on the arc-shaped sheet, and the efficiency of converting kinetic energy into mechanical energy is greatly improved. On the contrary, the trigger end of the straight rod is to reduce the resistance between the trigger end and the molten alloy, and the flowing molten alloy does not affect the downward swing of the trigger end.

[0010] Preferably, the upper end of the static valve housing is provided with an adjustment hole opposite to the ejector rod, and a second spring for tightening the ejector rod is provided in the adjustment hole. The adjustment hole is provided with a sliding sealing cover and a threaded cap, the second spring is located between the sliding sealing cover and the threaded cap, and the sliding sealing cover is located between the second spring and the ejector rod. The upper half of the adjustment hole is provided with a thread that matches the threaded cap, and the thrust of the ejector rod is adjusted by adjusting the screw-in length of the threaded cap, and the adjustment is adaptively made according to the casting requirements of different metals.

[0011] Preferably, an inner sliding cavity parallel to the second mounting hole is provided inside the movable valve housing, and a balancing sliding block connected to the other side of the linkage plate is provided in the inner sliding cavity.

[0012] Preferably, a disc spring for tightening the two trigger plates is provided inside the movable valve housing. After each casting, the movable valve housing and the static valve housing are separated as the movable mold and the fixed mold are separated, and the elastic force of the disc spring helps to remove the cooled metal in the flow channel, making cleaning more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0014] Figure 1 Schematic diagram of the internal structure of the moving valve housing and the static valve housing in this embodiment;

[0015] Figure 2 for Figure 1 Schematic diagram of the mid-flow channel after sealing;

[0016] Figure 3 Schematic diagram of the structure of the spoiler in this embodiment;

[0017] Figure 4 for Figure 3 Bottom view of .

[0018] In the accompanying drawings, there are a moving valve housing 1, a static valve housing 2, a push rod 3, a trigger valve core 4, a sealing valve core 5, a spoiler 6, a flow channel 7, a first mounting hole 8, a second mounting hole 9, a third mounting hole 10, a discharge port 11, a linkage plate 12, a trigger plate 13, a positioning hole 14, a boss 15, a sleeve 16, a liquid inlet 17, a through hole 18, a reset hole 19, a first spring 20, an inner sliding cavity 21, a balancing slider 22, a disc spring 23, a groove 24, a hinge shaft 25, a guide plate 26, an arc-shaped sheet 27, a straight rod 28, a diaphragm 29, an adjusting hole 30, a second spring 31, a sliding sealing cover 32, and a threaded cap 33. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0020] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0021] like Figure 1As shown, this embodiment provides a vacuum exhaust valve for casting; it includes a movable valve housing 1, a static valve housing 2, a push rod 3, a trigger valve core 4, a sealing valve core 5 and a spoiler 6; the upper end surface of the movable valve housing 1 is provided with a flow channel 7, the interior of the movable valve housing 1 is provided with a first mounting hole 8 and a second mounting hole 9 which are connected to the flow channel 7, and the trigger valve core 4 is installed in the first mounting hole 8, and the sealing valve core 5 is installed in the second mounting hole 9; the movable valve housing 1 is also provided with a third mounting hole 10, the push rod 3 is installed in the third mounting hole 10, and the third mounting hole 10 is located between the first mounting hole 8 and the second mounting hole 9, and the first mounting hole 8 is close to the liquid inlet 17 of the flow channel 7. The side of the corresponding movable valve housing 1 is provided with a drain port 11, and the drain port 11 is connected to the side of the second mounting hole 9. The third mounting hole 10 in this embodiment is not connected to the flow channel 7, and the flow channel 7 bypasses the side of the third mounting hole 10.

[0022] Similar to the existing exhaust valve, a linkage plate 12 adapted to the lower part of the trigger valve core 4 and two trigger plates 13 adapted to the lower end of the trigger valve core 4 are provided inside the movable valve housing 1; the linkage plate 12 is provided with two opposite positioning holes 14, and each trigger plate 13 is provided with a boss 15 adapted to the positioning hole 14; the linkage plate 12 is pressed between the push rod 3 and a trigger plate 13, and the edge of the linkage plate 12 is connected to the sealing valve core 5, and the trigger valve core 4 moves downward and pushes the bosses 15 of the two trigger plates 13 to move to the corresponding positioning holes 14, so that the push rod 3 pushes the linkage plate 12 to drive the sealing valve core 5 to move downward and seal the flow channel 7. The principle of sealing the flow channel 7 is as follows: a sliding sleeve 16 is provided in the second mounting hole 9, the sealing valve core 5 is slidably connected in the sliding sleeve 16, and a through hole 18 corresponding to the drain port 11 is provided on the side of the sliding sleeve 16, and the sealing valve core 5 is moved downward so that the upper end of the sealing valve core 5 blocks the sliding sleeve 16, thereby sealing the flow channel 7. A reset hole 19 opposite to the lower end of the sealing valve core 5 is provided inside the movable valve housing 1, and a first spring 20 in contact with the lower end of the sealing valve core 5 is provided in the reset hole 19. Before the trigger valve core 4 is activated, that is, before sealing, the elastic force of the first spring 20 needs to be used to lift the sealing valve core 5, so that the flow channel 7 is unobstructed, ensuring that the gas can be discharged in time.

[0023] In addition, the movable valve housing 1 is provided with an inner sliding cavity 21 parallel to the second mounting hole 9, and a balancing slider 22 connected to the other side of the linkage plate 12 is provided in the inner sliding cavity 21. The balancing slider 22 is used to balance the force on the linkage plate 12, and specifically, the balancing slider 22 and the sealing valve core 5 will be driven to move downward simultaneously during the downward movement of the linkage plate 12, effectively avoiding the problem of lateral deviation of the linkage plate 12 during the movement.

[0024] The movable valve housing 1 in this embodiment is connected to the movable die, and the corresponding static valve housing 2 is connected to the fixed die. A disc spring 23 is provided inside the movable valve housing 1 for tightening the two trigger plates 13. After each casting, the movable valve housing 1 and the static valve housing 2 are separated as the movable die and the fixed die are separated, and the elastic force of the disc spring 23 helps to remove the cooled metal in the flow channel 7, making cleaning more convenient.

[0025] The difference from the existing exhaust valve is that a groove 24 corresponding to the flow channel 7 is provided on the lower end surface of the static valve housing 2, the middle part of the spoiler 6 is hinged in the groove 24 through a hinge shaft 25, and the trigger end of the spoiler 6 contacts the upper end of the trigger valve core 4, and the force-bearing end of the spoiler 6 is close to the liquid inlet 17 of the flow channel 7. The flow channel 7 is provided with a guide plate 26 that bends toward the liquid inlet 17 of the flow channel 7, and the end of the guide plate 26 is adjacent to the force-bearing end of the spoiler 6. The molten alloy passes between the guide plate 26 and the spoiler 6, thereby pushing the trigger end of the spoiler 6 to squeeze the trigger valve core 4. Among them, the specific structure of the spoiler 6 is as follows:

[0026] like Figure 3 and Figure 4 As shown, a portion of the spoiler 6 near the liquid inlet 17 is in the shape of an arc-shaped piece 27, and the remaining portion of the spoiler 6 is in the shape of a straight rod 28, and the spoiler 6 of the straight rod 28 is in contact with the trigger valve core 4. The arc-shaped piece 27 near the force-bearing end increases the contact area with the molten alloy, and the flowing molten alloy can completely impact on the arc-shaped piece 27, and the efficiency of converting kinetic energy into mechanical energy is greatly improved. On the contrary, the trigger end of the straight rod 28 is to reduce the resistance between the trigger end and the molten alloy, and the flowing molten alloy does not affect the downward swing of the trigger end.

[0027] In order to ensure that the molten metal can smoothly push the trigger end, an elastically deformable diaphragm 29 is provided between the force-bearing end and the groove 24 in this embodiment. The diaphragm 29 is resistant to high temperatures and is not melted by the high-temperature molten metal. The gap between the spoiler 6 and the groove 24 is sealed by the diaphragm 29. After the gap between the spoiler and the groove 24 is sealed, the molten alloy can only flow through the space between the spoiler 6 and the guide plate 26, so the molten alloy will inevitably push the spoiler 6 to rotate counterclockwise, ensuring the uniqueness of the linkage and low failure rate of the vacuum exhaust valve.

[0028] like Figure 1 and Figure 2As shown, in this embodiment, the cross-sectional area of ​​the flow channel 7 near the liquid inlet 17 is reduced by the spoiler 6 and the guide plate 26. Even if a small amount of molten alloy flows through the structure, the force-bearing end of the spoiler 6 will be pushed upward, and the trigger plate 13 will swing downward and squeeze the trigger valve core 4 to move downward. The corresponding bosses 15 of the two trigger plates 13 move to the corresponding positioning holes 14, and the balance between the push rod 3, the linkage plate 12 and the trigger plate 13 is broken. Under the downward pressure of the push rod 3, the linkage plate 12 and the sealing valve core 5 are pushed downward. After the sealing valve core 5 moves downward, it blocks the flow channel 7, thereby achieving the sealing of the flow channel 7. Compared with the existing vacuum exhaust valve, the sealing valve core 5 cannot be pushed downward by a small amount of molten alloy, but the spoiler 6 uses the principle of lever to amplify the kinetic energy of the flowing small amount of molten alloy to push the sealing valve core 5 downward, that is, to increase the power to push the trigger valve core 4, improve the sensitivity of the vacuum exhaust valve, and help to improve the casting yield.

[0029] In order to meet the exhaust requirements of different types of metal castings, the upper end of the static valve housing 2 in this embodiment is provided with an adjustment hole 30 opposite to the ejector rod 3, and a second spring 31 for tightening the ejector rod 3 is provided in the adjustment hole 30. The adjustment hole 30 is provided with a sliding sealing cover 32 and a threaded cap 33, and the second spring 31 is located between the sliding sealing cover 32 and the threaded cap 33, and the sliding sealing cover 32 is located between the second spring 31 and the ejector rod 3. The upper half of the adjustment hole 30 is provided with a thread that matches the threaded cap 33, and the thrust of the ejector rod 3 is adjusted by adjusting the screw-in length of the threaded cap 33, and adaptively adjusted according to the casting requirements of different metals.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A vacuum exhaust valve for casting; characterized in that: It comprises a movable valve housing, a static valve housing, a push rod, a trigger valve core, a sealing valve core and a spoiler; the upper end surface of the movable valve housing is provided with a flow channel, the interior of the movable valve housing is provided with a first mounting hole and a second mounting hole which are communicated with the flow channel, the trigger valve core is installed in the first mounting hole, and the sealing valve core is installed in the second mounting hole; the movable valve housing is also provided with a third mounting hole, the push rod is installed in the third mounting hole, and the third mounting hole is located between the first mounting hole and the second mounting hole, and the first mounting hole is close to the liquid inlet of the flow channel; The lower end surface of the static valve housing is provided with a groove corresponding to the flow channel, the middle part of the spoiler is hinged in the groove, and the trigger end of the spoiler contacts the upper end of the trigger valve core and the force-bearing end of the spoiler is close to the liquid inlet of the flow channel; the flow channel is provided with a guide plate bent toward the liquid inlet of the flow channel, and the end of the guide plate is adjacent to the force-bearing end of the spoiler, and the molten alloy passes between the guide plate and the spoiler, thereby pushing the trigger end of the spoiler to squeeze the trigger valve core; The interior of the movable valve housing is provided with a linkage plate adapted to the lower part of the trigger valve core, and two trigger plates adapted to the lower end of the trigger valve core; the linkage plate is provided with two opposite positioning holes, and each trigger plate is provided with a boss adapted to the positioning hole; the linkage plate is pressed between the push rod and a trigger plate, and the edge of the linkage plate is connected to the sealing valve core, and the trigger valve core moves downward and pushes the bosses of the two trigger plates to move into the corresponding positioning holes, so that the push rod pushes the linkage plate to drive the sealing valve core to move downward and seal the flow channel; A portion of the spoiler plate close to the liquid inlet is in the shape of an arc-shaped sheet, and the remaining portion of the spoiler plate is in the shape of a straight rod, and the spoiler plate of the straight rod is in contact with the trigger valve core.

2. A vacuum exhaust valve for casting according to claim 1, characterized in that: A liquid discharge port is provided on the side of the movable valve housing, and the liquid discharge port is communicated with the side of the second mounting hole.

3. A vacuum exhaust valve for casting according to claim 2, characterized in that: The second mounting hole is provided with a sliding sleeve, the sealing valve core is slidably connected in the sliding sleeve, and the side of the sliding sleeve is provided with a through hole corresponding to the discharge port, and the sealing valve core is moved downward to make the upper end of the sealing valve core block the sliding sleeve, thereby sealing the flow channel.

4. A vacuum exhaust valve for casting according to claim 3, characterized in that: The interior of the movable valve housing is provided with a reset hole opposite to the lower end of the sealing valve core, and a first spring in contact with the lower end of the sealing valve core is provided in the reset hole.

5. The vacuum exhaust valve for casting according to claim 1, characterized in that: An elastically deformable diaphragm is provided between the force-bearing end and the groove, and the gap between the spoiler and the groove is sealed by the diaphragm.

6. A vacuum exhaust valve for casting according to claim 1, characterized in that: An adjusting hole opposite to the push rod is provided at the upper end of the static valve housing, and a second spring for tightening the push rod is provided in the adjusting hole.

7. A vacuum exhaust valve for casting according to claim 6, characterized in that: The adjusting hole is provided with a sliding sealing cover and a threaded cap, the second spring is located between the sliding sealing cover and the threaded cap, and the sliding sealing cover is located between the second spring and the ejector rod.

8. The vacuum exhaust valve for casting according to claim 1, characterized in that: An inner sliding cavity parallel to the second mounting hole is provided inside the movable valve housing, and a balancing sliding block connected to the other side of the linkage plate is provided in the inner sliding cavity.

9. The vacuum exhaust valve for casting according to claim 1, characterized in that: A disc spring for tightening the two trigger plates is arranged inside the movable valve housing.

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