A mold vacuum stop valve

Abstract

The present invention belongs to the field of mold technology, and relates to a mold vacuum shut-off valve. A mold vacuum shut-off valve comprises an upper valve body and a lower valve body; the upper valve body and the lower valve body are detachably connected; the upper valve body and the lower valve body surround a sliding cavity; a foldable exhaust plate assembly is slidably arranged in the sliding cavity; the foldable exhaust plate assembly and the inner wall of the sliding cavity together enclose an exhaust channel. Since the elastic modulus of the elastic connector at the far left is the smallest, the connecting plate at the far left is first rotated to a vertical state and blocks the first through hole before the metal liquid reaches the first through hole. It is prevented that the metal liquid enters the vacuum pumping device through the first through hole and causes damage to the vacuum pumping device. Since the connecting plates are gradually overlapped from left to right, the metal liquid entering the exhaust channel is gradually expelled from the exhaust channel from left to right, and enters the sliding cavity through the second through hole, so as to prevent the metal liquid from remaining in the exhaust channel.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a mold vacuum stop valve. Background Art

[0002] Die casting is a casting method that pours molten alloy liquid into a pressure chamber, fills the mold cavity at high speed, and solidifies the alloy liquid under pressure to form a casting. During the mold filling process, the gas in the cavity needs to be discharged in time to avoid problems such as pores and insufficient casting in the casting. Vacuum exhaust is an effective way to solve this problem. Therefore, an exhaust channel must be provided on the die casting machine mold, and a vacuum device must be used to allow the air in the mold cavity to be discharged smoothly.

[0003] If the vacuum device is directly connected to the mold cavity through the exhaust channel, the alloy liquid in the mold cavity can easily enter the vacuum device through the exhaust channel, causing damage to the vacuum device. The alloy liquid entering the exhaust channel can also easily block the exhaust channel, affecting the exhaust effect and further affecting the quality of the die casting.

[0004] In order to solve the above problems, the present invention proposes a mold vacuum stop valve. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention proposes a mold vacuum stop valve.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: comprising an upper valve body and a lower valve body; the upper valve body and the lower valve body are detachably connected; the upper valve body and the lower valve body surround a sliding cavity;

[0007] A foldable exhaust plate assembly is slidably disposed in the sliding cavity; the foldable exhaust plate assembly and the inner wall of the sliding cavity together enclose an exhaust channel;

[0008] A first through hole communicating with the exhaust passage is formed at one end of the upper valve body; the foldable exhaust plate assembly blocks the first through hole when folded;

[0009] The end of the foldable exhaust plate assembly away from the first through hole is fixedly connected to a piston plate; the piston plate is slidably arranged in the sliding cavity; the piston plate is provided with a second through hole communicating with the exhaust channel;

[0010] One end of the upper valve body away from the first through hole and the lower valve body surround a third through hole communicated with the sliding cavity.

[0011] Furthermore, the foldable exhaust plate assembly includes a first foldable exhaust plate and a second foldable exhaust plate; the left end of the first foldable exhaust plate and the left end of the second foldable exhaust plate are respectively arranged above and below the first through hole, and the right end of the first foldable exhaust plate and the right end of the second foldable exhaust plate are respectively arranged above and below the second through hole.

[0012] Furthermore, the first foldable exhaust plate and the second foldable exhaust plate are both formed by a plurality of connecting plates connected end to end in sequence; adjacent connecting plates are connected by elastic connecting members.

[0013] The connecting plate near the first through hole is softly connected to the inner wall of the upper valve body through an elastic connecting piece; the connecting plate near the second through hole is softly connected to the piston plate through an elastic connecting piece; the elastic modulus of the multiple elastic connecting pieces increases sequentially from the first through hole to the second through hole.

[0014] Furthermore, a rubber pad is provided at a connection point close to the second foldable exhaust plate after the first foldable exhaust plate is folded and a connection point close to the first foldable exhaust plate after the second foldable exhaust plate is folded; the rubber pad is elastic.

[0015] Furthermore, the second through hole is opened at the lower part of the piston plate; and the height of the first through hole is greater than the height of the second through hole.

[0016] Furthermore, the connecting plate near the first through hole is inclined downward relative to the first through hole; and the connecting plate near the second through hole is inclined upward relative to the second through hole.

[0017] Furthermore, corresponding connecting plates in the first foldable exhaust plate and the second foldable exhaust plate are parallel to each other.

[0018] Furthermore, the first through hole is connected to the vacuum pumping device through a vacuum pipe joint; the vacuum pipe joint is threadedly connected to the upper valve body.

[0019] Furthermore, the upper valve body and the lower valve body are connected by bolts.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Since the elastic modulus of each elastic connector is smaller than that of the elastic connector on its right, when the piston plate slides to the left, multiple connecting plates overlap from left to right in sequence. Since the elastic modulus of the elastic connector at the far left is the smallest, the connecting plate at the far left is first rotated to a vertical state and blocks the first through hole before the metal liquid reaches the first through hole. This prevents the metal liquid from entering the vacuum device through the first through hole and causing damage to the vacuum device.

[0022] 2. As the connecting plates gradually overlap from left to right, the metal liquid that enters the exhaust channel is gradually expelled from the exhaust channel from left to right and enters the sliding cavity through the second through hole, thereby preventing the metal liquid from remaining in the exhaust channel.

[0023] 3. The upper valve body and the lower valve body are threadedly connected, which facilitates the separation of the upper valve body and the lower valve body, and further facilitates the cleaning of the metal entering the sliding cavity and the exhaust channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 The present invention Figure 2 A magnified view of part A;

[0027] Figure 4 It is a schematic diagram of the state of the connecting plate after folding in the present invention.

[0028] In the figure: 1. upper valve body; 2. lower valve body; 3. bolt; 4. third through hole; 5. first through hole; 6. vacuum pipe joint; 7. piston plate; 8. second through hole; 9. connecting plate; 10. elastic connecting piece; 11. sliding chamber; 12. exhaust channel; 13. rubber pad. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 4 As shown, the technical solution adopted by the present invention is as follows: a mold vacuum stop valve comprises an upper valve body 1 and a lower valve body 2. The upper valve body 1 and the lower valve body 2 are detachably connected.

[0031] The upper valve body 1 and the lower valve body 2 are provided with threaded holes at four corners, and the bolts 3 pass through the threaded holes of the upper valve body 1 and the lower valve body 2 in sequence. The upper valve body 1 and the lower valve body 2 are connected by bolts, which facilitates the separation of the upper valve body 1 and the lower valve body 2 and the cleaning of the metal entering the sliding cavity 11.

[0032] The upper valve body 1 and the lower valve body 2 surround a sliding chamber 11. A foldable exhaust plate assembly is slidably disposed in the sliding chamber 11. The foldable exhaust plate assembly and the inner wall of the sliding chamber 11 together surround an exhaust passage 12.

[0033] The left end of the upper valve body 1 is provided with a first through hole 5, and a vacuum pipe joint 6 is threadedly connected to the first through hole 5 of the upper valve body 1. One end of the vacuum pipe joint 6 is connected to the first through hole 5, and the other end of the vacuum pipe joint 6 is connected to the vacuum pumping device.

[0034] A piston plate 7 is slidably disposed in the sliding cavity 11. The piston plate 7 is fixedly connected to an end of the foldable exhaust plate assembly away from the first through hole 5. A second through hole 8 is provided on the piston plate 7. The left end of the exhaust channel 12 is communicated with the first through hole 5, and the right end of the exhaust channel 12 is communicated with the second through hole 8.

[0035] The left end of the upper valve body 1 and the left end of the lower valve body 2 surround and form a third through hole 4. The third through hole 4 is communicated with the sliding cavity 11. The third through hole 4 is communicated with the mold cavity of the mold.

[0036] In the initial state, the piston plate 7 is in the sliding cavity 11 near the third through hole 4, the foldable exhaust plate assembly is wavy, not folded together, and the exhaust channel 12 is unobstructed. When the vacuum pump is working, the gas in the mold cavity enters the sliding cavity 11 through the third through hole 4, and enters the exhaust channel 12 through the second through hole 8, and then enters the vacuum pipe joint 6 through the first through hole 5, and is finally discharged to the outside by the vacuum pump. The gas in the mold cavity is extracted, thereby improving the quality of the die-casting and reducing the defects of the die-casting. In this process, the gas cannot push the piston plate 7 to slide to the left along the sliding cavity 11. The piston plate 7 and the foldable exhaust plate assembly remain unchanged.

[0037] The foldable exhaust panel assembly includes a first foldable exhaust panel and a second foldable exhaust panel.

[0038] Two ends of the first foldable exhaust plate are respectively arranged above the first through hole 5 and the second through hole 8 .

[0039] Two ends of the second foldable exhaust plate are respectively arranged below the first through hole 5 and the second through hole 8 .

[0040] The foldable exhaust plate comprises a plurality of connecting plates 9 and a plurality of elastic connecting members 10. Each connecting plate 9 is slidably and sealably matched with a sliding cavity 11.

[0041] The foldable exhaust plate is formed by connecting a plurality of connecting plates 9 end to end in sequence, and adjacent connecting plates 9 are connected by elastic connecting members 10 .

[0042] A rubber pad 13 is provided at a connection point of the first foldable exhaust plate close to the second foldable exhaust plate after the first foldable exhaust plate is folded and at a connection point of the second foldable exhaust plate close to the first foldable exhaust plate after the second foldable exhaust plate is folded. The rubber pad 13 is elastic.

[0043] When the piston plate 7 slides to the left, it pushes the foldable exhaust plate to slide to the left. Due to the obstruction of the left inner wall of the sliding cavity 11, the first foldable exhaust plate and the second foldable exhaust plate are gradually folded. That is, when the connecting plate 9 slides to the left, it rotates with the corresponding elastic connector 10 as the rotation axis, so that the angle between adjacent connecting plates 9 gradually decreases, and the adjacent connecting plates 9 gradually approach each other and finally overlap together. The elastic connector 10 and the rubber pad 13 are deformed as the connecting plates 9 are gradually overlapped to adapt to the change in the angle between the adjacent connecting plates 9.

[0044] The connecting plate 9 near the first through hole 5 is softly connected to the inner wall of the upper valve body 1 through an elastic connecting piece 10. The connecting plate 9 near the second through hole 8 is softly connected to the piston plate 7 through an elastic connecting piece 10.

[0045] When the first foldable exhaust plate and the second foldable exhaust plate are stacked together, the rubber pad 13 in the first foldable exhaust plate and the rubber pad 13 in the second foldable exhaust plate fit together, and the gap between the first foldable exhaust plate and the second foldable exhaust plate is sealed by the rubber pad 13, so that the exhaust channel 12 is completely closed to prevent metal liquid from remaining in the exhaust channel 12.

[0046] The elastic modulus of the multiple elastic connectors 10 increases in sequence from the first through hole 5 to the second through hole 8. That is, the elastic modulus of the elastic connector 10 connected to the inner wall of the upper valve body 1 is the smallest, and the elastic modulus of the elastic connector 10 connected to the piston plate 7 is the largest.

[0047] Thus, when the piston plate 7 slides to the left, the leftmost connecting plate 9 first rotates to a vertical state and blocks the first through hole 5 before the metal liquid reaches the first through hole 5. This prevents the metal liquid from entering the vacuum pumping device through the first through hole 5 and causing damage to the vacuum pumping device. Then, multiple connecting plates 9 are stacked together from left to right, and the space of the exhaust channel 12 is gradually compressed.

[0048] When the metal liquid impacts the piston plate 7, part of the metal liquid will enter the exhaust channel 12 through the second through hole 8. In the process of the exhaust channel 12 being gradually compressed from left to right, the metal liquid entering the exhaust channel 12 is gradually squeezed out from left to right and enters the sliding cavity 11 through the second through hole 8.

[0049] The second through hole 8 is provided at the lower part of the piston plate 7. The height of the first through hole 5 is greater than that of the second through hole 8. The connecting plate 9 near the first through hole 5 is inclined downward relative to the first through hole 5. The connecting plate 9 near the second through hole 8 is inclined upward relative to the second through hole 8. This arrangement hinders the metal liquid from entering the exhaust channel 12 to a certain extent, and reduces the metal liquid entering the exhaust channel 12.

[0050] The corresponding connecting plates 9 in the two groups of foldable exhaust plates are parallel to each other, so that the corresponding connecting plates 9 above and below can move synchronously.

[0051] Working principle: In the initial state, the foldable exhaust plate assembly is in a wavy state, that is, there is a certain angle between adjacent connecting plates 9, and each connecting plate 9 is in an inclined state. The exhaust channel 12 is connected to the first through hole 5 and the second through hole 8. The angle between the leftmost connecting plate 9 and the left inner wall of the sliding cavity 11 is smaller than the angle between the two connecting plates 9.

[0052] When in use, inject metal liquid into the filling mold cavity, and turn on the vacuum device to extract the gas in the filling mold cavity. The gas in the filling mold cavity enters the sliding cavity 11 through the third through hole 4, passes through the second through hole 8 along the rightmost exhaust plate 9 to enter the exhaust channel 12 upward, passes through the exhaust channel 12, and then enters the vacuum pipe joint 6 through the first through hole 5, and is finally discharged to the outside by the vacuum device. Thereby, the gas in the filling mold cavity is discharged, and the quality of the die-casting product is improved. In this process, the gas cannot push the piston plate 7 to slide to the left along the sliding cavity 11. The piston plate 7 and the foldable exhaust plate assembly remain stationary, and the exhaust channel 12 remains unobstructed.

[0053] When the metal liquid fills the mold cavity, it will enter the sliding cavity 11 through the third through hole 4 and impact the piston plate 7, causing the piston plate 7 to slide to the left. During the sliding of the piston plate 7 to the left, the multiple connecting plates 9 rotate with the elastic connecting member 10 connected thereto as the rotation axis and gradually slide to the left. The angle between adjacent connecting plates 9 gradually decreases until the adjacent connecting plates 9 overlap each other and the multiple connecting plates 9 become vertical. At the same time, the elastic connecting member 10 and the rubber pad 13 are deformed to adapt to the change of the angle between two adjacent connecting plates 9.

[0054] In this process, since the elastic modulus of each elastic connector 10 is different, the elastic modulus of each elastic connector 10 is smaller than the elastic modulus of the elastic connector 10 on its right side. Therefore, the rotation speed of each connecting plate 9 is greater than the rotation speed of the connecting plate 9 on its right side. Since the angle between the leftmost connecting plate 9 and the inner wall of the sliding cavity 11 is the smallest, the leftmost connecting plate 9 will be rotated to a vertical state first. The connecting plate 9 below the first through hole 5 is attached to the inner wall of the sliding cavity 11. The connecting plate 9 above the first through hole 5 is attached to the inner wall of the sliding cavity 11 at the first through hole 5, and the first through hole 5 is blocked.

[0055] When the metal liquid impacts the piston plate 7, part of the metal liquid will pass through the second through hole 8 and move upward along the rightmost connecting plate 9 and enter the exhaust channel 12. Before the metal liquid reaches the first through hole 5 along the exhaust channel 12, the upper leftmost connecting plate 9 has blocked the first through hole 5, so the metal liquid cannot pass through the first through hole 5 and enter the vacuum pipe joint 6, thereby protecting the vacuum pumping device. As the connecting plates 9 are gradually overlapped, the space of the exhaust channel 12 is gradually reduced, and the metal liquid entering the exhaust channel 12 is squeezed out from the right end of the exhaust channel 12 and discharged to the outside of the piston plate 7 through the second through hole 8. When the first foldable exhaust plate and the second foldable exhaust plate are completely overlapped, the lower end of the rubber pad 13 in the first foldable exhaust plate conflicts with the upper end of the rubber pad 13 in the second foldable exhaust plate. The side of the rubber pad 13 in the first foldable exhaust plate and the side of the rubber pad 13 in the corresponding first foldable exhaust plate are attached together. The side of the rubber pad 13 in the second foldable exhaust plate is attached to the side of the rubber pad 13 in the corresponding second foldable exhaust plate. The space of the exhaust channel 12 is completely compressed, so that the metal liquid entering the exhaust channel 12 is completely squeezed out. At this time, the piston plate 7 is kept at the extreme position on the left side of the sliding cavity 11 under the pressure of the liquid, and the first through hole 5 and the second through hole 8 are both blocked by the connecting plate 9.

[0056] After the metal liquid cools down, remove the bolt 3 from the threaded hole, separate the upper valve body 1 and the lower valve body 2, and detach the foldable exhaust plate assembly and the piston plate 7 from the lower valve body 2. Then separate the piston plate 7 from the upper valve body 1, and pull the piston plate 7 so that the foldable exhaust plate assembly is gradually straightened, which is convenient for inspection and maintenance of the foldable exhaust plate assembly. At this time, the right end of the foldable exhaust plate assembly is separated from the upper valve body 1, and the cooled metal in the upper valve body 1 and the lower valve body 2 is cleaned up. Then put the piston plate 7 into the right end of the upper valve body 1, and the foldable exhaust plate is wavy at this time. Connect the lower valve body 2 and the upper valve body 1 together with the bolt 3 for next use.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mold vacuum stop valve, characterized in that: It comprises an upper valve body (1) and a lower valve body (2); the upper valve body (1) and the lower valve body (2) are detachably connected; the upper valve body (1) and the lower valve body (2) surround a sliding cavity (11); A foldable exhaust plate assembly is slidably disposed in the sliding cavity (11); the foldable exhaust plate assembly and the inner wall of the sliding cavity (11) together enclose an exhaust passage (12); A first through hole (5) communicating with the exhaust passage (12) is formed at one end of the upper valve body (1); the first through hole (5) is blocked when the foldable exhaust plate assembly is folded; The end of the foldable exhaust plate assembly away from the first through hole (5) is fixedly connected to a piston plate (7); the piston plate (7) is slidably disposed in the sliding cavity (11); the piston plate (7) is provided with a second through hole (8) communicating with the exhaust channel (12); One end of the upper valve body (1) away from the first through hole (5) and the lower valve body (2) form a third through hole (4) communicating with the sliding cavity (11).

2. A mold vacuum shut-off valve according to claim 1, characterized in that: The foldable exhaust plate assembly comprises a first foldable exhaust plate and a second foldable exhaust plate; the left end of the first foldable exhaust plate and the left end of the second foldable exhaust plate are respectively arranged above and below the first through hole (5), and the right end of the first foldable exhaust plate and the right end of the second foldable exhaust plate are respectively arranged above and below the second through hole (8).

3. A mold vacuum shut-off valve according to claim 2, characterized in that: The first foldable exhaust plate and the second foldable exhaust plate are both formed by a plurality of connecting plates (9) connected end to end in sequence; adjacent connecting plates (9) are connected by elastic connecting members (10); The connecting plate (9) near the first through hole (5) is softly connected to the inner wall of the upper valve body (1) via an elastic connecting piece (10); the connecting plate (9) near the second through hole (8) is softly connected to the piston plate (7) via an elastic connecting piece (10); the elastic moduli of the plurality of elastic connecting pieces (10) increase in sequence from the first through hole (5) to the second through hole (8).

4. A mold vacuum shut-off valve according to claim 3, characterized in that: A rubber pad (13) is provided at a connection point close to the second foldable exhaust plate after the first foldable exhaust plate is folded and at a connection point close to the first foldable exhaust plate after the second foldable exhaust plate is folded; the rubber pad (13) is elastic.

5. The mold vacuum shut-off valve according to claim 1, characterized in that: The second through hole (8) is opened at the lower part of the piston plate (7); the height of the first through hole (5) is greater than the height of the second through hole (8).

6. A mold vacuum shut-off valve according to claim 3, characterized in that: The connecting plate (9) near the first through hole (5) is inclined downward relative to the first through hole (5); and the connecting plate (9) near the second through hole (8) is inclined upward relative to the second through hole (8).

7. The mold vacuum shut-off valve according to claim 3, characterized in that: The corresponding connecting plates (9) in the first foldable exhaust plate and the second foldable exhaust plate are parallel to each other.

8. The mold vacuum shut-off valve according to claim 1, characterized in that: The first through hole (5) is connected to the vacuum extraction device via a vacuum pipe joint (6); the vacuum pipe joint (6) is threadedly connected to the upper valve body (1).

9. The mold vacuum shut-off valve according to claim 1, characterized in that: The upper valve body (1) and the lower valve body (2) are connected by bolts.

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