A vacuum valve device

Abstract

The application relates to a vacuum valve device, belonging to the technical field of pressure casting. The vacuum valve device comprises a fixed valve body, a vacuum valve communicating with the inner cavity of the fixed valve body and a sealing valve core slidingly installed on the fixed valve body, the end of the sealing valve core is provided with an air extraction gap communicating with the fixed valve body, and the fixed valve body is provided with a sealing ring groove for sealing abutting of the sealing valve core; the sealing valve core has a first working position and a second working position; when the sealing valve core is in the first working position, the air extraction gap and the sealing ring groove are staggered, the fixed valve body and a mold cavity are communicated through the air extraction gap; the vacuum valve body is started, the sealing valve core slides towards the fixed valve body under the pushing action of aluminum liquid, and when the air extraction gap and the sealing ring groove correspond, the sealing valve core is in the second working position, and the fixed valve body and the mold cavity are sealed and isolated at this time. The application has the effect of reducing the probability of aluminum liquid leakage to the valve body.

Description

Technical Field

[0001] This application relates to the field of pressure casting technology, and in particular to a vacuum valve device. Background Technology

[0002] The rapid development of new energy vehicles has led to the pursuit of lightweight bodies while also ensuring safety, prompting the widespread application of aluminum alloy high-pressure casting technology in the manufacture of automotive structural components.

[0003] In aluminum alloy high-pressure casting, the presence of a large amount of gas in the mold cavity leads to a high gas content in the product, directly affecting its performance. During heat treatment, the gas in the product will be released, causing bubbling and affecting its appearance and performance. Therefore, it is necessary to minimize the gas content of the product. Vacuum die casting technology using die casting molds exists, which removes gas from the die casting mold cavity during the die casting process, eliminating or significantly reducing porosity and dissolved gases in the die casting, thereby improving the mechanical properties and surface quality of the die casting.

[0004] Regarding the aforementioned technologies, hydraulic active valves are currently commonly used for vacuuming. However, the cylinder often fails to retract completely, resulting in delayed valve closure and causing molten aluminum to move into the valve body. Utility Model Content

[0005] In order to reduce the probability of molten aluminum leaking into the valve body, this application provides a vacuum valve device.

[0006] The vacuum valve device provided in this application adopts the following technical solution:

[0007] A vacuum valve device includes a fixed valve body, a vacuum valve communicating with the inner cavity of the fixed valve body, and a sealing valve core slidably mounted on the fixed valve body. The end of the sealing valve core is provided with an air extraction notch communicating with the fixed valve body, and the fixed valve body is provided with a sealing ring groove for the sealing valve core to seal against.

[0008] The sealing valve core has a first working position and a second working position. When the sealing valve core is in the first working position, the air extraction notch and the sealing ring groove are staggered, and the fixed valve body and the cavity are connected through the air extraction notch. When the vacuum valve body is activated, the sealing valve core slides into the fixed valve body under the push of the aluminum liquid. When the air extraction notch and the sealing ring groove are aligned, the sealing valve core is in the second working position. At this time, the fixed valve body and the cavity are sealed and isolated.

[0009] By adopting the above technical solution, the sealing valve core slides back and forth in the fixed valve body. When the sealing valve core is in the first position, the cavity and the fixed valve body are connected. As the vacuum valve extracts the air from the cavity, the material in the cavity pushes the sealing valve core to slide into the fixed valve body. After the sealing valve core is in the second position, the inside of the fixed valve body and the cavity are sealed and isolated, ensuring the molding quality. The above-mentioned vacuum valve assembly has a simplified structure and an ideal sealing effect.

[0010] Optionally, the sealing valve core includes a sliding part located in the fixed valve body and a sealing part disposed at one end of the sliding part, the air extraction notch is disposed on the outer wall of the sealing part, and the outer diameter of the sealing part is greater than or equal to that of the sliding part, and the sealing ring groove is adapted to seal the sealing part.

[0011] By adopting the above technical solution, the structural composition of the sealing valve core is specifically disclosed. The outer diameter of the sealing part is larger than that of the sliding part, which increases the sealing contact area between the sealing valve body and the fixed valve body when the sealing valve core is in the second position, thereby improving the sealing valve core and sealing stability.

[0012] Optionally, the other end of the sealing valve core is provided with a limiting part, and the fixed valve body is provided with a sealing chamber for the sliding part and a limiting chamber for the sealing arrangement of the limiting part. The sealing chamber corresponds to the vacuum valve, and the fixed valve body is provided with a limiting block in the limiting chamber for axially limiting the limiting part.

[0013] By adopting the above technical solution, the cooperation between the limiting part and the limiting block can limit the axial sliding of the sealing valve core, while the sealing contact between the limiting part and the limiting chamber can achieve a sealing effect on the other end of the sealing valve core.

[0014] Optionally, the air extraction notch is symmetrically arranged along the axis of the sealing part, and the air extraction notch has an inwardly concave arc surface on the side facing the axis of the sealing part.

[0015] By adopting the above technical solution, the air extraction notch is symmetrically arranged along the axial direction of the sealing part to ensure the uniformity of air extraction. At the same time, the concave arc surface can further increase the air extraction volume in the same amount of time compared with the horizontal surface, thus improving the air extraction effect.

[0016] Optionally, the end of the sealing part is provided with an inner groove for material to be pushed.

[0017] By adopting the above technical solution, the inner groove is designed so that the flowing material can be stored in the inner groove, thereby improving the material's pushing effect on the sealing valve core.

[0018] Optionally, the vacuum valve assembly further includes an overflow connector that connects the cavity and the fixed valve body. The overflow connector has an installation hole for the fixed valve body to be inserted into, and the overflow connector is provided with a connecting pipe that connects the cavity.

[0019] By adopting the above technical solution, the overflow connector connects the vacuum valve assembly and the cavity, and the valve body is fixed and inserted into the mounting hole, which simplifies the installation structure of the valve body and improves the stability of the valve body. The connection pipeline can reduce the probability of material overflow and leakage.

[0020] Optionally, the connecting pipeline includes a conveying channel and an overflow channel. The two ends of the conveying channel are connected to the cavity and the inner groove. One end of the conveying channel is provided with a conveying trough for arranging the sealing part. The axial length of the conveying trough is greater than the moving distance of the limiting part. The overflow channels are spaced apart on opposite sides of the conveying channel.

[0021] By adopting the above technical solution, the composition of the connecting pipeline is further disclosed. The conveying channel directly connects the cavity and the inner groove, so that the material directly pushes the sealing valve core, and the pushing effect is more ideal. The overflow channel is set up to store the overflow of the material that is subsequently conveyed.

[0022] Optionally, the conveying channel is provided with a conveying trough for arranging the sealing part at one end near the fixed valve body. The conveying trough includes a first trough and a second trough. The inner diameter of the first trough is smaller than that of the second trough. When the sealing valve core is in the first position, the sealing part seals against the inner wall of the first trough. When the sealing valve core is in the second position, the sealing part and the second trough correspond to each other.

[0023] By adopting the above technical solution and setting the conveying trough, when the sealing valve core switches from the first station to the second station, the aluminum liquid can push the sealing valve core in the first trough. When the sealing valve core is in the second station, the aluminum liquid flows to the second trough and is then conveyed to the overflow channel along the second trough, further reducing the probability of aluminum liquid leakage.

[0024] Optionally, the fixed valve body has a connecting part at the end away from the sealing part, and a sliding drive member at the end away from the cavity. A connecting block is provided between the sliding drive member and the connecting part.

[0025] By adopting the above technical solution, the fixed valve body can move axially under the action of the sliding drive component. The fixed valve body and the sliding drive component are fixed together by a connecting block. When the product is demolded, the sliding drive component is activated to drive the fixed valve body and the sealing valve core to move simultaneously, so that the sealing valve core is removed from the conveying trough, which facilitates the demolding of the product.

[0026] Optionally, the connecting block is provided with connecting grooves on both sides of the connecting part and the sliding drive component for fixed cooperation. The top of the connecting block is also provided with a sensing block. The moving mold is provided with two sets of micro switches on one side of the sensing block and along the axis of the sealing valve core. The stroke of the fixed valve body is monitored by the micro switches.

[0027] By adopting the above technical solution, a sensing block is set on the connecting block. The sensing block and two sets of micro switches work together to improve the stability of the travel signal.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This application improves the suction volume and suction efficiency by setting the concave arc surface on the suction notch, thereby improving the molding effect of the product.

[0030] 2. The overall structure of this application is simple, the concentricity of the sealing valve core and the fixed valve body is ideal, and it is easy to disassemble and assemble;

[0031] 3. The method of fitting the overflow connector and the fixed valve body in this application is simple, ensuring concentricity and sealing effect. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a vacuum valve assembly according to an embodiment of this application.

[0033] Figure 2 This is a cross-sectional schematic diagram of the sealing valve core in the first position according to an embodiment of this application.

[0034] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0035] Figure 4 This is a schematic diagram of the structure of the sealing valve core in an embodiment of this application.

[0036] Figure 5 This is a cross-sectional schematic diagram of the sealing valve core in the second position according to an embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the installation components in an embodiment of this application.

[0038] Figure 7 This is a schematic diagram of the overflow structure in an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Vacuum valve assembly; 2. Fixed valve body; 21. Sealing chamber; 22. Limiting chamber; 23. Limiting block; 24. Radial fixing element; 241. Fixing element; 242. Locking spring; 243. Fixed ball head; 25. Radial groove; 26. Sealing ring groove; 27. Reset elastic element; 28. Connecting part; 3. Vacuum valve; 4. Sealing valve core; 41. Sliding part; 42. Sealing part; 421. Evacuation notch; 4211. Concave arc surface; 422. Internal groove; 423. Pressing groove; 43. Limiting part; 431, sealing contact surface; 432, fixing surface; 5, overflow block; 51, conveying channel; 511, conveying trough; 5111, first trough; 5112, second trough; 52, overflow channel; 521, collection trough; 522, top material through hole; 53, mounting hole; 6, mounting assembly; 61, mounting block; 611, mounting trough; 62, guide block; 7, sliding drive component; 71, connecting block; 711, connecting groove; 72, sensing block; 721, sensing part; 73, micro switch. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0041] This application discloses a vacuum valve device.

[0042] Reference Figure 1 A vacuum valve device includes a vacuum valve assembly 1 and a mounting assembly 6. The vacuum valve assembly 1 includes a fixed valve body 2, a vacuum valve 3, a sealing valve core 4, an overflow block 5, and a sliding drive component 7. The fixed valve body 2 is generally cylindrical, and its interior has a sealing chamber 21 and a limiting chamber 22 sequentially along the axial direction. The sealing chamber 21 is located at the end of the fixed valve body 2 near the mold cavity, and the end of the sealing chamber 21 penetrates through the side wall of the fixed valve body 2. The vacuum valve 3 is fixedly installed on the top of the fixed valve body 2, and its output end is connected to the sealing chamber 21.

[0043] Reference Figure 2 , Figure 3 and Figure 4 The sealing valve core 4 is slidably mounted on the fixed valve core, and includes a sliding part 41, a sealing part 42, and a limiting part 43. The sliding part 41 is located in the sealing chamber 21, and its outer diameter is smaller than the inner diameter of the sealing chamber 21. The limiting part 43 is located in the limiting chamber 22, and its two ends have sealing contact surfaces 431 that seal against the inner wall of the limiting chamber 22. The fixed valve body 2 is provided with a limiting block 23 corresponding to the limiting chamber 22. The limiting block 23 is arranged between the two sealing contact surfaces 431, and the axial displacement distance of the sealing valve core 4 is limited by the limiting block 23.

[0044] The fixed valve body 2 also has a radial fixing member 24 on the side of the limiting block 23 away from the sealing part 42. The radial fixing member 24 includes a fixing member 241, a locking spring 242, and a fixing ball head 243. A radial groove 25 is formed on the fixed valve body 2 in the radial direction for the radial fixing member 24 to be arranged. The radial groove 25 communicates with the limiting chamber 22. The limiting part 43 has a fixing surface 432 for the fixing ball head 243 to always abut against. The outer diameter of the fixing surface 432 is smaller than that of the sealing abutment surface 431.

[0045] The sealing part 42 is located at the end of the sliding part 41. The outer diameter of the sealing part 42 is larger than the outer diameter of the sliding part 41. The fixed valve body 2 is provided with a sealing ring groove 26 at the opening of the sealing chamber 21. The sealing ring groove 26 and the sealing part 42 are sealed together.

[0046] The outer wall of the sealing part 42 is provided with an air extraction notch 421, one end of which penetrates the side wall of the sealing part 42 toward the sliding part 41. In this embodiment, the sealing part 42 is provided with two sets of air extraction notches 421, which are symmetrically arranged along the axis of the sealing part 42. The air extraction notch 421 has a concave arc surface 4211 on the side facing the axis of the sealing part 42, which can increase the air extraction volume in the same amount of time and improve the air extraction efficiency compared to a horizontal surface. The end of the sealing part 42 also has an inner groove 422 to improve the pushing effect of the material on the sealing valve core 4.

[0047] Combination Figure 5 The sliding of the sealing valve core 4 on the fixed valve body 2 gives the sealing valve core 4 a first working position and a second working position. When the sealing valve core 4 is in the first working position, the sealing part 42 is located on the outside of the sealing valve body. The air extraction notch 421 and the sealing ring groove 26 are intersected. The fixed valve body 2 and the cavity are connected through the air extraction notch 421. The sealing chamber 21 and the cavity are interconnected.

[0048] When the vacuum valve 3 is activated, the air in the cavity is extracted and becomes negative pressure. Under the push of the melt, the sealing valve core 4 slides into the fixed valve body 2. When the air extraction notch 421 corresponds to the sealing ring groove 26, the sealing head seals against the sealing ring groove 26, and the fixed valve body 2 and the cavity are isolated from each other. At this time, the sealing valve core 4 is in the second working position.

[0049] In order to achieve automatic reset of the sealing valve core 4, a reset elastic element 27 is also provided inside the fixed valve core. In this embodiment, the reset elastic element 27 is a rectangular spring, with its two ends abutting against the inner wall of the limiting part 43 and the limiting chamber 22 respectively, so that after the air pressure in the cavity is restored, the sealing valve core 4 automatically resets to the first position under the action of the reset elastic element 27.

[0050] Reference Figure 6The mounting assembly 6 is fixed to the moving mold of the die-casting mold and is used to fix the valve body 2. The mounting assembly 6 includes a mounting block 61 and a guide block 62. The top of the mounting block 61 has a mounting groove 611 for arranging the fixed valve body 2. The width of the mounting groove 611 is greater than the outer diameter of the fixed valve body 2. The guide blocks 62 are fixed to opposite sides of the mounting groove 611 by bolts, and the fixed valve body 2 is located between the two guide blocks 62.

[0051] The fixed valve body 2 also has a connecting portion 28 at the end away from the sealing portion 42. A sliding drive 7 connecting the positioning portion is fixedly mounted on the mounting block 61. The sliding drive 7 enables the fixed valve body 2 to slide back and forth, so as to disengage the sealing valve core 4 from the second groove 5112. In this embodiment, the sliding drive 7 is a hydraulic cylinder. The output end of the sliding drive 7 and the connecting portion 28 are provided with connecting blocks 71. Connecting grooves 711 are provided on both opposite sides of the connecting blocks 71 to engage with the connecting portion 28 and the sliding drive 7.

[0052] A sensing block 72 is bolted to the top of the connecting block 71. Two sets of microswitches 73 are spaced apart on the top of the guide block 62 along the sliding direction of the fixed valve body 2. The side wall of the sensing block 72 is provided with a sensing part 721 that abuts against the microswitches 73. Both sides of the sensing part 721 have guide slopes so that when the sensing block 72 moves, it abuts against the two microswitches 73 in sequence.

[0053] An overflow connector 5 is located at one end of the mounting assembly 6 near the cavity. Both the moving mold and the fixed mold are equipped with overflow connectors 5, and a connecting pipe is formed between the two overflow connectors 5 to connect the cavity. The connecting pipe includes a conveying channel 51 and an overflow channel 52.

[0054] The conveying channel 51 is a straight channel, with its two ends corresponding to the cavity and the inner groove 422, respectively. A conveying groove 511 for arranging the sealing part 42 is provided on the side of the conveying channel 51 near the fixed valve body 2. The conveying groove 511 is a stepped groove. Along the axis of the sealing valve core 4, this stepped groove consists of a first groove 5111 and a second groove 5112. The inner diameter of the first groove 5111 is smaller than that of the second groove 5112. When the sealing valve core 4 is in the first position, the outer wall of the sealing part 42 abuts against the inner wall of the first groove 5111. When the sealing valve core 4 is in the second position, the sealing part 42 corresponds to the second groove 5112.

[0055] The overflow channel 52 is a bend, and two sets of overflow channels 52 are provided on opposite sides of the conveying channel 51. The ends of the two sets of overflow channels 52 away from the conveying channel 51 have collection troughs 521. The depth of the collection troughs 521 is greater than that of the overflow channels 52. The overflow receiving block 5 is provided with a top material through hole 522 on the bottom wall of both the conveying channel 51 and the overflow channel 52. A top rod connected to the top rod mechanism is provided at the top material through hole 522 to push the material solidified in the connecting pipeline.

[0056] The implementation principle of a vacuum valve device in this application embodiment is as follows: the sealing valve core 4 is in the first working position under normal conditions. When die casting is performed, the air in the cavity is extracted by the vacuum valve 3, so that the cavity is under negative pressure. The aluminum liquid in the cavity is transported to the overflow block 5 and first transported along the conveying channel 51. The aluminum liquid pushes the sealing valve core 4 to slide into the fixed valve body 2. When the sealing valve core 4 moves to the second working position, the cavity and the sealing chamber 21 are isolated.

[0057] After the mold is demolded, the sliding drive 7 is activated to drive the fixed valve body 2 to move, so that the fixed valve body 2 and the sealing valve core 4 are separated from the conveying trough 511, which makes it easier for the ejector mechanism to eject the aluminum liquid block solidified in the conveying channel 51. After the aluminum liquid block is ejected, the sealing valve core 4 is reset to the first position under the action of the reset elastic element 27.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum valve device, characterized in that, The vacuum valve assembly (1) and the mounting assembly (6) for mounting the vacuum valve assembly include a fixed valve body (2), a vacuum valve (3) communicating with the inner cavity of the fixed valve body (2), and a sealing valve core (4) slidably mounted on the fixed valve body (2). The end of the sealing valve core (4) is provided with an air extraction notch (421) communicating with the fixed valve body (2). The fixed valve body (2) is provided with a sealing ring groove (26) for the sealing valve core (4) to seal against. The sealing valve core (4) has a first working position and a second working position. When the sealing valve core (4) is in the first working position, the air extraction notch (421) and the sealing ring groove (26) are staggered, and the fixed valve body (2) and the cavity are connected through the air extraction notch (421). When the vacuum valve (3) is activated, the sealing valve core (4) slides into the fixed valve body (2) under the push of the aluminum liquid. When the air extraction notch (421) and the sealing ring groove (26) are in the second working position, the fixed valve body (2) and the cavity are sealed and isolated at this time.

2. The vacuum valve device according to claim 1, characterized in that, The sealing valve core (4) includes a sliding part (41) located in the fixed valve body (2) and a sealing part (42) disposed at one end of the sliding part (41). The air extraction notch (421) is disposed on the outer wall of the sealing part (42), and the outer diameter of the sealing part (42) is greater than or equal to that of the sliding part (41). The sealing ring groove (26) is sealed and adapted to the sealing part (42).

3. A vacuum valve device according to claim 2, characterized in that, The other end of the sealing valve core (4) is provided with a limiting part (43). The fixed valve body (2) is provided with a sealing chamber (21) for the sliding part (41) to be arranged and a limiting chamber (22) for the limiting part (43) to be sealed. The sealing chamber (21) corresponds to the vacuum valve (3). The fixed valve body (2) is provided with a limiting block (23) in the limiting chamber (22) for axially limiting the limiting part (43).

4. A vacuum valve device according to claim 2, characterized in that, The air extraction notch (421) is symmetrically arranged along the axis of the sealing part (42), and the air extraction notch (421) has an inwardly concave arc surface (4211) on the side facing the axis of the sealing part (42).

5. A vacuum valve device according to claim 3, characterized in that, The end of the sealing part (42) is provided with an inner groove (422) for pushing materials.

6. The vacuum valve (3) device according to claim 3, characterized in that, The vacuum valve assembly (1) also includes an overflow connector (5) that connects the cavity and the fixed valve body (2). The overflow connector (5) has an installation hole (53) for the fixed valve body (2) to be inserted into, and the overflow connector (5) is provided with a connecting pipe that connects to the mold cavity.

7. A vacuum valve device according to claim 6, characterized in that, The connecting pipeline includes a conveying channel (51) and an overflow channel (52). The two ends of the conveying channel (51) are connected to the cavity and the inner groove (422). One end of the conveying channel (51) is provided with a conveying trough (511) for the sealing part (42) to be arranged. The axial length of the conveying trough (511) is greater than the moving distance of the limiting part (43). The overflow channel (52) is spaced on opposite sides of the conveying channel (51).

8. A vacuum valve (3) device according to claim 7, characterized in that, The conveying channel (51) is provided with a conveying trough (511) for the sealing part (42) to be arranged at one end near the fixed valve body (2). The conveying trough (511) includes a first trough (5111) and a second trough (5112). The inner diameter of the first trough (5111) is smaller than that of the second trough (5112), and the second trough (5112) is connected to the overflow channel (52). When the sealing valve core (4) is in the first position, the sealing part (42) seals against the inner wall of the first trough (5111). When the sealing valve core (4) is in the second position, the sealing part (42) corresponds to the second trough (5112).

9. A vacuum valve device according to claim 1, characterized in that, The fixed valve body (2) has a connecting part (28) at one end away from the sealing part (42), and a sliding drive (7) at one end away from the mold cavity. A connecting block (71) is provided between the sliding drive (7) and the connecting part (28), and the fixed valve body (2) is driven to slide through the connecting block (71).

10. A vacuum valve device according to claim 9, characterized in that, The connecting block (71) has connecting grooves (711) on both sides of the connecting part (28) and the sliding drive (7) for fixed cooperation. The top of the connecting block (71) is also provided with a sensing block (72). The mounting assembly (6) has two sets of micro switches (73) on one side of the sensing block (72) and along the axis of the sealing valve core (4). The micro switches (73) monitor the stroke information of the fixed valve body (2).

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