A linkage structure for use in a vacuum valve

Abstract

This utility model relates to a linkage structure for use in a vacuum valve. Through the cooperation of an actuating piston, a linkage lever, an upper servo piston, a lower servo piston, and a stationary mold guide plate, it can be used to achieve linkage with an exhaust piston. This design optimizes the cooperation between the servo piston and the linkage lever, avoiding the movement pattern caused by the edge of the linkage piston contacting the servo piston. It also changes the contact relationship between the actuating piston and the linkage lever, and the design of the interlocking structure avoids the possibility of the actuating piston breaking and the linkage lever being damaged.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy casting and processing technology, and specifically to a linkage structure used in a vacuum valve. Background Technology

[0002] In aluminum alloy die casting, molten aluminum is poured after the moving mold and stationary mold are closed, and then the aluminum alloy die casting is obtained through a series of processes. We found that in the existing technology, on December 23, 2019, the applicant, Chongqing Yujiang Die Casting Co., Ltd., designed a "Vacuum Valve for Die Casting". In the stationary mold body of this structure, there are servo pistons, intermediate pistons, exhaust pistons and other interconnected components. When the molten aluminum applies pressure to the starter, it pushes the starter piston to move to the right. The starter piston pushes the intermediate piston. Since the intermediate piston is coaxially connected by the disc-shaped part on the left and the journal on the right, the disc part of the intermediate piston engages with the servo piston. Then, the exhaust piston engages with the groove of the intermediate piston. When the servo piston moves to the right, it drives the exhaust piston to move to the right through the groove on its large diameter section. There is an annular exhaust groove on the outer circular surface of the exhaust piston. When the exhaust piston moves to the right, the annular exhaust groove gradually disengages from the air passage on the exhaust hole bushing, cutting off the connection between the molten aluminum control chamber and the vertical exhaust hole and vacuum pump, thereby closing the exhaust channel. When the exhaust piston closes the exhaust passage, the vacuum pump stops working, completing one vacuuming process. (Refer to the appendix of this design.) Figure 4 In the middle, we can see that the structure of the intermediate piston includes "a disc-shaped part on the left and a journal on the right connected coaxially". The main function of the intermediate piston is to push the exhaust piston. Its potential technical problem is that it is relatively large in size, including the disc-shaped part and the journal with holes. The starting piston is inserted into the intermediate piston. Due to the interpenetrating design, part of the starting piston is inside the intermediate piston. Due to its stepped structure, there is a risk of breakage at the contact point between the starting piston and the intermediate piston (the stepped position, the boundary between the exposed and interpenetrating position). In view of this, this invention is hereby applied for. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this invention provides a linkage structure for use within a vacuum valve that can improve upon these shortcomings.

[0004] This utility model relates to a linkage structure for use in a vacuum valve, including a starting piston, a linkage lever, an upper servo piston, a lower servo piston, and a stationary mold guide plate. The starting piston is located above the linkage lever, and the linkage lever is in contact with the bottom surface of the starting piston. The linkage lever is capable of tilting relative to the starting piston. The stationary mold guide plate is located below the linkage lever and is used to provide a fulcrum and / or buffer when the linkage lever moves downward. The upper servo piston is located on the top surface of one end of the linkage lever, and the lower servo piston is located on the bottom surface of one end of the linkage lever. When the starting piston presses the linkage lever downward, the linkage lever, under the resistance of the guide plate and with the cooperation of the upper and lower servo pistons, converts the linear motion of the starting piston into the tilting motion of the linkage lever, causing one end of the linkage lever to rise and the other end to fall, thus driving the exhaust piston to move downward.

[0005] Furthermore, the bottom surface of the starting piston is convex, which allows it to make top-surface contact with the linkage lever.

[0006] Furthermore, the stationary mold guide plate is used to provide guidance and cushioning when the linkage lever moves downward.

[0007] Furthermore, the upper surface of the guide plate is an arc-shaped convex surface, which is adapted to the bottom surface of the linkage lever.

[0008] Furthermore, a reset spring for buffering is provided on the bottom surface of the stationary mold guide plate.

[0009] Furthermore, the bottom surface of the upper servo piston is provided with a lower protrusion, which is used to embed with the top surface of the linkage lever to achieve the positioning of the linkage lever.

[0010] Furthermore, the top surface of the lower servo piston is provided with an upper protrusion, which is used to embed with the bottom surface of the linkage lever to realize the positioning and pushing of the linkage lever.

[0011] Furthermore, the starting piston is located in the upper stationary mold body of the vacuum valve stationary mold valve body, and the linkage lever and stationary mold guide plate are located in the lower stationary mold body of the vacuum valve stationary mold valve body.

[0012] Furthermore, the lowering end of the linkage lever is used to drive the exhaust piston inside the vacuum valve body.

[0013] This invention features an ingenious design. It utilizes a starting piston, a novel linkage lever, an upper servo piston, a lower servo piston, and a stationary mold guide plate. The starting piston is positioned above the linkage lever, which contacts the bottom surface of the starting piston. The linkage lever can tilt relative to the starting piston. The stationary mold guide plate is located below the linkage lever, providing a fulcrum and / or buffering effect when the linkage moves downwards. Through the cooperation of the starting piston, starting lever, stationary mold guide plate, upper servo piston, and lower servo piston, the linkage of the exhaust piston can be achieved or used. This design optimizes the cooperation between the servo piston and the linkage lever (equivalent to the intermediate piston in the prior art), avoiding the movement pattern caused by the linkage piston edge contacting the servo piston. It also changes the contact relationship between the starting piston and the linkage lever, abandoning the interlocking structure design and adopting a "top surface contact" method. This avoids the possibility of the starting piston breaking due to excessive length and the possibility of damage to the linkage lever. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the linkage lever structure in this utility model.

[0015] Figure 2 This is a partial view of the right side of the linkage lever.

[0016] Figure 3 for Figure 1 Sectional view of AA.

[0017] Figure 4 This is a schematic diagram of the installation of this utility model.

[0018] Figure 5 This is a schematic diagram of the starting piston structure in this utility model.

[0019] Figure 6 This is a schematic diagram of the static mold guide plate structure in this utility model.

[0020] Figure 7 This is a schematic diagram of the top structure of the valve body under the static mold in this utility model.

[0021] Figure 8 This is a schematic diagram of the structure of this utility model.

[0022] Diagram: 1 Linkage lever, 2 Side arm, 3 Protrusion, 4 Connecting end, 5 Protrusion groove, 6 Upper servo piston, 61 Lower protrusion, 7 Lower servo piston, 71 Upper protrusion, 8 Starting piston, 81 Convex surface, 9 Stationary mold guide plate, 91 Return spring, 91 Arc-shaped convex surface, 10 Exhaust piston, 11 Piston bushing, 111 Hole, 12 Filter air vent, 13 Preload spring, 14 Upper valve body of stationary mold, 15 Lower valve body of stationary mold, 16 Groove, 101 Circumferential exhaust hole, 21 Piston spring, 22 Mounting groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0024] like Figure 1-4 As shown in Figure 8. The applicant has designed a linkage structure for use within a vacuum valve, belonging to a novel structure of internal transmission relationships within a vacuum valve. Specifically, it includes an upper valve body and a lower valve body. A servo piston 6 is mounted on the bottom surface of the upper valve body, and a lower servo piston 7 is mounted on the top surface of the lower valve body. The lower servo piston has a lower protrusion 61 on its bottom surface and an upper protrusion 71 on its top surface. A piston spring 21 for pushing the lower servo piston is mounted on its bottom surface. Figure 7 As shown, a mounting groove 22 is provided on the top surface of the valve body under the static mold. The mounting groove is circular, and a linkage lever 1 is provided in the mounting groove. Side arms 2 are symmetrically provided on both sides of one end of the linkage lever. The linkage lever and the side arms are an integral structure forming a T-shape. The outer end of the side wall can be used to rest on the mounting groove, which can support the linkage lever. A protrusion 3 is provided near the end of the side wall of the linkage lever. In this way, the overall appearance forms a The protrusion is provided with a connecting end 4 for engaging the exhaust piston valve inside the vacuum valve. The bottom surface of the left end of the linkage lever contacts the upper protrusion of the lower servo piston, and its top surface contacts the lower protrusion of the upper servo piston. The upper and lower servo pistons constrain one end of the linkage lever. The linkage lever is kept horizontal by the clamping of the starting piston and the upper and lower servo pistons through the stationary mold guide plate. There is a gap between the bottom surface of the side wall and the mounting groove. This gap is used to block the linkage lever when it moves downward by the side arm. For better cooperation, protrusions and grooves 5 are provided at the contact positions of the linkage lever with the upper and lower servo pistons. Figure 3 As shown, this allows the upper and lower protrusions to fit more easily into the protrusion grooves. The lower protrusion of the upper servo piston and the upper protrusion of the lower servo piston are actually a "hinge point" or "rotation pair" embedded in the groove of the linkage lever. It constrains the horizontal movement of this end of the lever (preventing the linkage lever from lateral movement), but allows it to rotate slightly around this point. A spring-loaded stationary mold guide plate 9 is set in the middle of the mounting groove below the linkage lever, such as... Figure 6As shown, the upper surface of the guide plate is an arc-shaped convex surface 92, which is adapted to the bottom surface of the linkage lever. This convex surface forms point or line contact with the bottom surface of the linkage lever, ensuring that the contact position dynamically changes with the lever's tilt state when the linkage lever is pressed. To achieve springback, a return spring 91 is installed on the bottom surface of the stationary mold guide plate. The stationary mold guide plate provides guidance and cushioning when the linkage lever moves downward. An actuating piston 8 is positioned inside the valve body of the stationary mold, relative to the stationary mold guide plate. The actuating piston is sleeved within an actuating piston bushing. Figure 5As shown, the bottom surface of the starting piston is a convex surface 81. This convex surface 81 forms point contact or line contact with the top surface of the linkage lever 1, ensuring that the contact position can dynamically change with the tilt state of the lever when the linkage lever 1 is pressed. The starting piston is used to be pushed by the molten aluminum. An exhaust piston and an exhaust piston bushing are set at the other end of the linkage lever. The exhaust piston bushing and the starting piston bushing are both sealed and installed in the upper valve body of the stationary mold. The lower end of the exhaust piston is exposed outside the piston bushing and has a groove. The end of the linkage lever near the exhaust piston is inserted into the groove to form a linkage relationship. A warning spring is set at the lower end of the exhaust piston to push it. Correspondingly, the upper servo piston, the lower servo piston, and the piston spring 21 are set in the upper and lower stationary mold valve bodies to accommodate the starting piston bushing, the exhaust piston bushing, the warning spring, and the reset spring, as well as their matching clearance areas. The clearance areas are in the shape of a column groove. The upper servo piston and the lower servo piston are not fixed in the clearance areas. It should be noted that The design ensures a sufficient safety distance between the clearance area and the linkage lever support. When molten aluminum flows into the groove, it pushes the starting piston downward. Then, the convex surface of the starting piston's bottom surface begins to contact and press against the top surface of the linkage lever's center. Since both are rigid and one side is convex, the initial contact point is near the apex of the convex surface. Then, when the linkage lever is subjected to downward pressure in the center, it begins to move downward as a whole. Its bottom surface then contacts the arc-shaped convex surface of the stationary mold guide plate and begins to compress the return spring at the bottom of the stationary mold guide plate. The ingenuity of this design lies in the "double convex surface guidance and motion conversion." Specifically, as the linkage lever continues to press down, its contact point with the stationary mold guide plate slides along the arc-shaped convex surface from the center to one side. At the same time, as the linkage lever begins to tilt, its contact point with the starting piston also slides along the piston's convex surface. These two dynamically changing contact points work together to efficiently and smoothly convert the vertical downward movement of the starting piston into a "translation-tilting" composite motion of the linkage lever. This combined motion causes the left end of the linkage lever to move downwards. This downward force acts on the upper protrusion of the lower servo piston through the groove on its bottom surface, compressing the compression spring 21 at the bottom of the lower servo piston. This causes the entire side to move downwards. At the same time, the lever rotates slightly around its left hinge point (i.e., the constraint of the upper protrusions 61 and 71), ultimately causing one end of the linkage lever to rise and the other end to fall, thus driving the exhaust piston to move downwards, i.e., towards the lower valve body of the stationary mold.

[0025] A filter guide hole 12 connected to a vacuum pump is provided on the side of the valve body on the stationary mold. An orifice 111 through which the filter guide hole is opened on the piston bushing. An exhaust annular groove 101 is provided on the upper side wall of the exhaust piston. The area between the exhaust annular groove and the top surface of the exhaust piston forms a sealing end. When the exhaust piston does not move downward, the filter guide hole, the orifice, and the exhaust annular groove 101 are connected. A groove 16 for receiving molten aluminum is provided on the top surface of the valve body on the stationary mold. The starting piston bushing on the valve body on the stationary mold is also located at the bottom surface of the groove. The top of the exhaust piston bushing is located in the groove. In the natural state (when the exhaust piston does not move downward), the top surface of the exhaust piston is exposed above the top surface of the exhaust piston bushing and is lower than the top surface of the valve body on the stationary mold. At this time, a part of the exhaust annular groove 101 is exposed above the top surface of the exhaust piston bushing. The exhaust annular groove and the groove are connected. At the same time, the top surface of the starting piston bushing is flush with the top surface of the starting piston and located at the bottom surface of the groove.

[0026] Before the aluminum liquid is poured, a moving mold valve body (not shown) is installed above the stationary mold body. A pre-tightening rod (not shown) is also installed inside the valve body below the stationary mold. The valve body on the stationary mold has two through holes, and the pre-tightening rod is installed in the through holes. This is existing technology. The top of the pre-tightening rod protrudes from the valve body on the stationary mold, and its lower end contacts the surface of the stationary mold guide plate. The two pre-tightening components are located on the circumference of the stationary mold guide plate. Since the linkage rod is T-shaped, it will not affect the pre-tightening rod. The pre-tightening rod is located on both sides of the linkage rod. It should be noted that the pre-tightening rod is an existing technology mechanism, used for blocking when the moving mold valve body and the stationary mold body are in contact. After the valve bodies on the mold are combined, the lower end of the pre-tightening component will cause the stationary mold guide plate to move downwards. This makes it easier for the starting piston to push the connecting lever, connect the filter at the filter air guide hole, connect the filter to the vacuum pump, and start the vacuum pump. Since the filter air guide hole, orifice, exhaust ring groove 101 and groove are interconnected, the air in the groove can be adsorbed to ensure that a vacuum area is formed between the moving mold valve body and the groove. The applicant needs to emphasize that the mold combination of the moving mold valve body and the stationary mold valve body is in the prior art and should be known by those skilled in the art. Therefore, no detailed structural description or motion description is given. During the flow of molten aluminum, the starting piston is first driven to move downward (towards the lower valve body of the stationary mold). The starting piston will then move downward against the linkage lever. Since the stationary mold guide plate 9 is set below the linkage lever, the stationary mold guide plate moves downward instantaneously. At the same time, the piston spring 21 on the bottom surface of the lower servo piston will push the servo piston upward. Simultaneously, the upper and lower servo pistons together constrain the linkage lever to tilt to the right (forming a left-high-right-low shape). At the same time, the linkage lever moves downward as a whole. Since the right end of the linkage lever is engaged with the exhaust piston, it naturally drives the exhaust piston to move downward. The sealing end of the exhaust piston will retract into the exhaust piston bushing. The top surface of the exhaust piston and the top surface of the exhaust piston bushing are sealed and flush, cutting off the vacuum passage and completing the valve closure. The molten aluminum fills the entire trench, completing the casting process. After casting is completed, the molten aluminum cools and solidifies, separating the valve body on the moving mold from the valve body on the stationary mold. The aluminum parts are then removed, releasing the pressure on the starting piston 8. At this point, the return spring 91 at the bottom of the stationary mold guide plate 9 extends, pushing the stationary mold guide plate 9 upwards. Its arc-shaped convex surface 92 then pushes the middle part of the linkage lever 1 back to its initial position. Then, the middle part of the linkage lever 1 moves upwards, and the pressure on the lower servo piston 7 at its left end disappears. The piston spring 21 at the bottom of the lower servo piston 7 extends, pushing the lower servo piston 7 and the left end of the linkage lever 1 back to their initial positions. Simultaneously, the linkage lever 1 moves upwards and gradually returns to a horizontal position, with its right end rising accordingly. Through the cooperation of the connecting end 4 and the slot 100, it drives the exhaust piston 10 to move upwards with the assistance of its pre-tension spring 13, reopening the vacuum channel and restoring communication between the circumferential exhaust port 101 and the filter guide port 12. As the linkage lever moves upwards, the starting piston is simultaneously squeezed back to its initial position.

[0027] This design is an improvement on the intermediate piston, featuring a linkage lever with a side arm 2, a protrusion at the end, and a connecting end. The overall design is... This design, being a single, integrated structure, can save approximately 60% of material for the same diameter (taking the overall length of the linkage lever + protrusion + connecting end as 90mm, the width of each as 18mm, the length of the protrusion + connecting end as 10mm, the distance between the two side wall end faces as 52mm, and the side wall width as 16mm, the area of ​​this design is approximately 2180mm²). 2 The area of ​​a central piston of the same size is approximately 6358.5 mm². 2 The side arm designed on the linkage lever near the connecting end has the potential function of supporting the linkage lever when the starting piston impacts the top surface of the linkage piston. Without the side wall design, the linkage lever could be damaged in experiments, especially at the connecting end. Therefore, the length of the connecting end should not be too long.

Claims

1. A linkage structure for use in a vacuum valve, characterized by: The device includes a starting piston, a linkage lever, an upper servo piston, a lower servo piston, and a stationary mold guide plate. The starting piston is located above the linkage lever, and the linkage lever is in contact with the bottom surface of the starting piston. The linkage lever is capable of tilting relative to the starting piston. The stationary mold guide plate is located below the linkage lever and provides a fulcrum and / or buffer when the linkage lever moves downward. The upper servo piston is located on the top surface of one end of the linkage lever, and the lower servo piston is located on the bottom surface of one end of the linkage lever. When the starting piston presses down on the linkage lever, the linkage lever, with the resistance of the guide plate and the cooperation of the upper and lower servo pistons, converts the linear motion of the starting piston into the tilting motion of the linkage lever, causing one end of the linkage lever to rise and the other end to fall, thus driving the exhaust piston to move downward.

2. The linkage structure for use in a vacuum valve according to claim 1, characterized in that: The bottom surface of the starting piston is convex.

3. A linkage for use in a vacuum valve according to claim 2, wherein: The upper surface of the guide plate is an arc-shaped convex surface, which is adapted to the bottom surface of the linkage lever.

4. The linkage for use in a vacuum valve according to claim 3, wherein: The bottom surface of the stationary mold guide plate is provided with a reset spring for buffering.

5. The linkage for use in a vacuum valve of claim 1, wherein: The bottom surface of the upper servo piston is provided with a lower protrusion, which is used to embed with the top surface of the linkage lever to achieve the positioning of the linkage lever.

6. A linkage for use in a vacuum valve according to claim 5, wherein: The lower servo piston has an upper protrusion on its top surface, which is used to embed with the bottom surface of the linkage lever to achieve the positioning and pushing of the linkage lever.

7. The linkage for use in a vacuum valve of claim 1, wherein: The starting piston is located in the upper valve body of the stationary mold of the vacuum valve, and the linkage lever and the stationary mold guide plate are located in the lower valve body of the stationary mold of the vacuum valve.

8. The linkage for use in a vacuum valve of claim 1, wherein: The lowering end of the linkage lever is used to drive the exhaust piston inside the vacuum valve body.

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