Exhaust manifold casting device

Abstract

The exhaust manifold casting device comprises a supporting base, the left side and the right side of the supporting base are each provided with a set of vertical supports, a supporting frame is arranged between the left vertical support and the right vertical support, the two sides of the supporting frame are rotationally connected with the vertical supports on the corresponding sides through supporting shafts, and a casting mold is arranged in the supporting frame in an up-down sliding mode; the casting mold comprises an upper mold and a lower mold which are correspondingly arranged up and down, a plurality of groups of upper demolding through holes which are uniformly distributed are vertically formed in the middle of the upper mold, a group of upper demolding rods are coaxially arranged in each group of upper demolding through holes, each group of upper demolding rods are fixed to the top of the supporting frame, and the upper demolding rods are in clearance fit with the upper demolding through holes; a plurality of groups of lower demolding through holes which are uniformly distributed are vertically formed in the middle of the lower mold, a group of lower demolding rods are coaxially arranged in each group of lower demolding through holes, the lower demolding rods are in clearance fit with the lower demolding through holes, and each group of lower demolding rods are fixed at the bottom of the supporting frame; a sprue gate is further formed in the front end of the lower die; the sprue gate penetrates through the front side wall of the lower mold and is communicated with the lower mold inner cavity; according to the exhaust manifold casting device, the upper mold and the lower mold are assembled and disassembled, relative movement of the upper mold and the lower mold and the corresponding upper demolding rod and the lower demolding rod is achieved, the structure of the exhaust manifold casting device is simplified, and the matching precision of the exhaust manifold casting device is improved.

Description

Technical Field

[0001] This invention relates to casting apparatus, and more particularly to an exhaust manifold casting apparatus. Background Technology

[0002] Casting is a metal hot working process in which metal is melted into a liquid that meets certain requirements and poured into the cavity of a mold. After cooling and solidification, the hot metal is cleaned and finished to obtain a casting with a predetermined shape, size, and properties. Because the cast blank is nearly formed, it achieves the purpose of eliminating or minimizing machining, which reduces costs and manufacturing time to a certain extent. Casting is one of the basic processes in modern equipment manufacturing industry.

[0003] In the casting process, the mold includes an upper mold 4 and a lower mold 5. The inner cavity of the mold is formed by the relative movement of the upper mold 4 and the lower mold 5. Hot metal solidifies within the mold cavity to form a casting blank. When the casting blank needs to be removed, the upper mold 4 and the lower mold 5 move in opposite directions to open the mold cavity and remove the casting blank. During production, the casting blank may adhere to the mold cavity, making it difficult for the blank to detach and hindering the gripping ability of technicians. In existing casting equipment, the middle of the upper and lower molds 5 is also... The casting blank ejector rod is provided, and a separate drive (cylinder or hydraulic cylinder) is set to control the movement of the ejector rod, thereby separating the casting mold from the casting blank. In the prior art, setting a separate drive to control the ejector rod in the casting device increases the structure of the casting device, increases the manufacturing cost, and increases the complexity of the casting device debugging (when the hot metal enters the inner cavity of the casting mold, the ejector rod is located outside the inner cavity of the casting mold; after the hot metal cools and solidifies to form the casting blank, the ejector rod squeezes the casting blank to separate it from the inner cavity of the casting mold).

[0004] During the casting process of exhaust manifolds, the inner cavity of the mold has multiple curved surfaces. When liquid metal is poured into the inner cavity of the mold, the fluidity of the liquid metal decreases and the flow rate slows down when it flows through areas with large curvature. This increases the probability of porosity in the exhaust manifold casting blank (the liquid metal cools and solidifies due to the slow flow rate) and reduces the pass rate of the exhaust manifold casting blank. Summary of the Invention

[0005] The purpose of this invention is to provide an exhaust manifold casting device that enables the closing and opening of the upper and lower molds, as well as the relative movement of the upper and lower molds with the corresponding upper and lower ejector rods. This simplifies the structure of the exhaust manifold casting device and improves the fitting accuracy of the exhaust manifold casting device.

[0006] The present invention adopts the following technical solution:

[0007] An exhaust manifold casting device includes a support base with a set of vertical supports on both the left and right sides. A support frame is rotatably connected between the two sets of vertical supports. A casting mold is slidably arranged inside the support frame. The casting mold includes an upper mold and a lower mold arranged vertically and vertically. Several sets of upper and lower demolding through holes are vertically and evenly distributed in the middle of the upper and lower molds. An upper demolding rod and a lower demolding rod are coaxially arranged in each set of upper and lower demolding through holes. The upper and lower demolding rods are respectively clearance-fitted with the upper and lower demolding through holes. Each set of upper and lower demolding rods is fixed to the top and bottom of the support frame, respectively. A pouring gate is also provided at the front end of the lower mold. The pouring gate penetrates the front side wall of the lower mold and communicates with the inner cavity of the lower mold.

[0008] Furthermore, the casting mold is equipped with synchronous linkage mechanisms on both the left and right sides. The synchronous linkage mechanisms are used to make the upper mold and the lower mold move synchronously towards or away from each other. A driving cylinder is provided on the lower side of the lower mold. The fixed end of the driving cylinder fixes the lower end face of the support frame, and the moving end of the driving cylinder fixes the lower end face of the lower mold.

[0009] Furthermore, each set of synchronous linkage mechanisms includes a horizontally arranged rotating shaft and an upper moving shaft and a lower moving shaft arranged parallel to each other above and below the rotating shaft; the outer end of the rotating shaft is fixed to the middle of the upper and lower connecting rods, and the upper and lower ends of the first connecting rods are rotatably connected to the upper and lower moving rods respectively, and the upper end of the upper moving rod and the lower end of the lower moving rod are rotatably connected to the outer ends of the upper and lower moving shafts respectively; the inner ends of the upper and lower moving shafts are fixedly connected to the upper mold and the lower mold respectively; the rotating shaft is rotatably arranged on the outside of the corresponding support frame; the first connecting rod is at a set angle to the upper moving rod and the lower moving rod respectively.

[0010] Furthermore, the flipping mechanism includes a drive cylinder, with the fixed end of the drive cylinder hinged to the rear of the support base, and the moving end of the drive cylinder hinged to the rear side of the support frame, with the hinge position located above the support shaft.

[0011] Furthermore, both the upper end of the upper mold and the lower end of the lower mold are provided with negative pressure driving mechanisms. The negative pressure driving mechanisms are used to continuously generate negative pressure in the inner cavity of the casting mold during the flipping process of the support frame.

[0012] Furthermore, the negative pressure drive mechanism includes several upper piston receiving holes respectively disposed in the upper mold and several lower piston receiving holes in the lower mold. Each set of upper piston receiving holes and lower piston receiving holes is coaxially opened in the upper part of the corresponding upper demolding through hole and the lower part of the corresponding lower demolding through hole. Upper pistons and lower pistons are respectively sealed and slidably disposed in the upper piston receiving holes and lower piston receiving holes, and upper demolding rods and lower demolding rods are respectively slidably passed through the corresponding upper pistons and lower pistons. Several upper pistons and several lower pistons are respectively fixed on the lower end face of the upper support plate and the upper end face of the lower support plate. Upper guide rods and lower guide rods are fixed horizontally on the left and right sides of the front part of the upper support plate and the lower support plate. Each set of upper guide rods and lower guide rods is rotatably connected to an upper connecting rod and a lower connecting rod. The lower end of the upper connecting rod and the upper end of the lower connecting rod are hinged through a connecting column. The upper connecting rod and the lower connecting rod are at a set angle and the connecting column is always behind the upper guide rod and the lower guide rod.

[0013] Furthermore, a pressing part is provided on the rear side of the connecting column, which is used to drive the connecting column to move forward.

[0014] Furthermore, the extrusion part includes a cam disposed on the rear side of the connecting column and a transmission rod coaxially fixed with the base circle of the cam. The transmission rod passes through the side wall of the support frame and the rotating shaft on the corresponding side in sequence and is coaxially disposed with the rotating shaft. The transmission rod is rotatably connected to both the support frame and the rotating shaft. A swing gear is coaxially fixed to the outer end of the transmission rod. A fixed gear meshes below the swing gear. The fixed gear is coaxially disposed with the support shaft and rotatably connected with the support shaft. The lower part of the fixed gear is fixed to the inner side of the vertical support on the corresponding side.

[0015] Furthermore, when the support frame is set vertically, the contact point between the connecting column and the cam is at the near end of the cam's push stroke; when the support frame is set horizontally, the contact point between the connecting column and the cam is at the far end of the cam's push stroke.

[0016] Furthermore, each set of upper and lower pistons is coaxially fitted with an upper return spring and a lower return spring, respectively. The upper and lower ends of the upper return spring are fixed to the upper support plate and the upper mold, respectively; the upper and lower ends of the lower return spring are fixed to the lower mold and the lower support plate, respectively, and each set of upper and lower return springs is in a stretched state.

[0017] I. This invention, by setting a synchronous linkage mechanism, allows the upper mold to move synchronously towards or away from the lower mold while the lower mold moves upward driven by the driving cylinder. Through a set of driving cylinders, it realizes both the closing and opening of the upper and lower molds, as well as the relative movement of the upper and lower molds with the corresponding upper and lower ejector rods. This simplifies the structure of the exhaust manifold casting device and improves the fitting accuracy of the exhaust manifold casting device.

[0018] Second, this invention, by setting a negative pressure driving mechanism, creates a negative pressure in the inner cavity of the mold as the mold rotates with the support frame. Under the combined action of gravity and atmospheric pressure, the liquid metal near the pouring gate quickly enters the inner cavity of the mold, making the liquid metal evenly distributed in the inner cavity of the mold and improving the qualification rate of the cast blank. At the same time, when the mold is reset by rotating in the opposite direction with the support frame, the negative pressure driving mechanism creates a positive pressure between the cast blank and the inner cavity of the mold, which promotes the separation of the cast blank from the inner cavity of the mold. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the support base in this invention;

[0020] Figure 2 This is a schematic diagram of the structure of the driving cylinder in this invention;

[0021] Figure 3 This is a schematic diagram of the upper moving axis in this invention;

[0022] Figure 4 This is a schematic diagram of the fixed gear structure in this invention;

[0023] Figure 5 This is a schematic diagram of the supporting frame in this invention;

[0024] Figure 6 This is a schematic diagram of the upper piston structure in this invention;

[0025] Figure 7 This is a schematic diagram of the upper movable rod in this invention;

[0026] Figure 8 This is a schematic diagram of the upper connecting rod in this invention.

[0027] In the diagram, 1. Support base; 2. Vertical brace; 3. Support frame; 4. Upper mold; 5. Lower mold; 6. Upper demolding through hole; 7. Upper demolding rod; 8. Lower demolding through hole; 9. Lower demolding rod; 10. Sprue; 11. Rotating shaft; 12. Upper moving shaft; 13. Lower moving shaft; 14. Clearance slot; 15. Drive cylinder; 16. First connecting rod; 17. Upper moving rod; 18. Lower moving rod; 19. Casting funnel; 20. Drive cylinder; 21. Support shaft; 22. Upper piston receiving hole; 23. Lower piston receiving hole; 24. Upper piston; 25. Lower piston; 26. Upper support plate; 27. Lower support plate; 28. Upper guide rod; 29. ​​Lower guide rod; 30. Upper connecting rod; 31. Lower connecting rod; 32. Cam; 33. Swing gear; 34. Fixed gear; 35. Connecting column. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0029] Please see Figure 1-8 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] The exhaust manifold casting device of the present invention includes a support base 1, with a set of vertical supports 2 on both the left and right sides of the support base 1. A support frame 3 is provided between the two sets of vertical supports 2. Both sides of the support frame 3 are rotatably connected to the corresponding side vertical supports 2 via support shafts 21. A casting mold is slidably arranged inside the support frame 3. The casting mold includes an upper mold 4 and a lower mold 5 arranged vertically and vertically. Several sets of upper demolding through holes 6 are vertically and evenly distributed in the middle of the upper mold 4. A set of upper demolding rods 7 are coaxially arranged in each set of upper demolding through holes 6. The top of the fixed support frame 3 has an upper demolding rod 7 that is clearance-fitted with the upper demolding through hole 6 (the clearance fit is beneficial for venting gas from the inner cavity of the casting mold and preventing a large amount of liquid metal from flowing out); the lower mold 5 has several sets of lower demolding through holes 8 that are evenly distributed vertically in the middle, and a set of lower demolding rods 9 are coaxially arranged in each set of lower demolding through holes 8. The lower demolding rods 9 are clearance-fitted with the lower demolding through holes 8, and each set of lower demolding rods 9 is fixed to the bottom of the support frame 3; the front end of the lower mold 5 is also provided with a pouring gate 10; the pouring gate 10 penetrates the front side wall of the lower mold 5 and communicates with the inner cavity of the lower mold 5.

[0031] During operation, when the upper mold 4 and lower mold 5 move synchronously towards each other (the upper mold 4 moves downward while the lower mold 5 moves upward) until they close to form the inner cavity of the casting mold, the lower end of the fixed upper demolding rod 7 moves relative to the upper mold 4 until the lower end of the upper demolding rod 7 is outside the inner cavity of the casting mold; at the same time, the upper end of the fixed lower demolding rod 9 moves relative to the lower mold 5 until the upper end of the lower demolding rod 9 moves relative to the outer cavity of the casting mold (the lower ends of the upper demolding rod 7 and the lower demolding rod 9 are still in the upper demolding through hole 6 and the lower demolding through hole 8, respectively); at this time, the molten metal that meets the set requirements is poured into the inner cavity of the casting mold through the pouring port 10 until the hot metal is cooled and solidified to form a casting blank with a predetermined shape;

[0032] Immediately afterwards, the upper mold 4 and the lower mold 5 move in opposite directions simultaneously. The lower end of the fixed upper demolding rod 7 moves relative to the upper mold 4 until the lower end of the upper demolding rod 7 penetrates into the inner cavity of the upper mold 4. When the casting blank adheres to the inner cavity of the upper mold 4, the casting blank will separate from the inner cavity of the upper mold 4 under the pressure of the lower end of the upper demolding rod 7.

[0033] Simultaneously, the upper end of the fixed lower demolding rod 9 moves relative to the lower mold 5 until the upper end of the lower demolding rod 9 penetrates into the lower mold 5; when the casting blank adheres to the inner cavity of the upper mold 4, the casting blank adhered to the inner cavity of the lower mold 5 is separated from the inner cavity of the upper mold 4 under the pressure of the upper end of the lower demolding rod 9; when the casting blank does not adhere to the inner cavity of the upper mold 4, the casting blank will be between the upper demolding rod 7 and the lower demolding rod 9 and the lower side of the casting blank will contact the top of the lower demolding rod 9 under the action of gravity, and technicians can quickly remove the casting blank with special tools (clamps).

[0034] In order to enable the upper mold 4 and the lower mold 5 to move synchronously towards or away from each other, in this invention, a synchronous linkage mechanism is provided on both the left and right sides of the casting mold. The synchronous linkage mechanism is used to enable the upper mold 4 and the lower mold 5 to move synchronously towards or away from each other. A driving cylinder 15 is provided on the lower side of the lower mold 5. The fixed end of the driving cylinder 15 fixes the lower end face of the support frame 3, and the moving end of the driving cylinder 15 fixes the lower end face of the lower mold 5.

[0035] During operation, the drive cylinder 15 drives the lower mold 5 to move upward. At the same time as the lower mold 5 moves upward, the synchronous linkage mechanism drives the upper mold 4 to move synchronously and towards the lower mold 5.

[0036] In this embodiment, each set of synchronous linkage mechanisms includes a horizontally arranged rotating shaft 11 and an upper moving shaft 12 and a lower moving shaft 13 arranged parallel above and below the rotating shaft 11, respectively; the outer end of the rotating shaft 11 is fixed to the middle of the vertically arranged first connecting rod 16, and the upper and lower ends of the first connecting rod 16 are rotatably connected to the upper moving rod 17 and the lower moving rod 18, respectively. The upper end of the upper moving rod 17 and the lower end of the lower moving rod 18 are rotatably connected to the outer ends of the upper moving shaft 12 and the lower moving shaft 13, respectively; the left and right side walls of the support frame 3 are provided with vertical clearance slots 14, and each set of clearance slots 14 is distributed vertically along the corresponding side rotating shaft 11. The inner ends of the upper moving shaft 12 and the lower moving shaft 13 are distributed through the upper and lower parts of the corresponding side clearance slots 14 and are fixedly connected to the upper mold 4 and the lower mold 5, respectively; the rotating shaft 11 is rotatably arranged on the outside of the corresponding support frame 3.

[0037] In order to enable the lower mold 5 to move synchronously while the driving cylinder 15 drives the lower mold 5 to move, the synchronous linkage mechanism drives the lower mold 5 to move synchronously. The first link 16 is at a set angle (such as 60 degrees) with the upper moving rod 17 and the lower moving rod 18 respectively, and the internal offset angles formed by the first link 16 with the upper moving rod 17 and the lower moving rod 18 are equal.

[0038] During operation, the drive cylinder 15 drives the lower mold 5 to move upward, and the lower moving shaft 13, which is fixed to the lower mold 5, moves upward. The upward movement of the lower moving shaft 13 drives the lower end of the first connecting rod 16 to move upward. The first connecting rod 16 rotates around the rotating shaft 11 as the center, and the upper end of the first connecting rod 16 moves downward. The upper end of the first connecting rod 16 drives the upper moving shaft 12 to move downward. At the same time, the upper mold 4, which is fixed to the upper moving shaft 12, moves downward, so that the upper mold 4 and the lower mold 5 move towards each other.

[0039] The driving cylinder 15 drives the lower mold 5 to move downward, and the lower moving shaft 13, which is fixed to the lower mold 5, moves downward. The downward movement of the lower moving shaft 13 drives the lower end of the first connecting rod 16 to move downward. The first connecting rod 16 rotates in the opposite direction with the rotating shaft 11 as the center, and the upper end of the first connecting rod 16 moves upward. The upper end of the first connecting rod 16 drives the upper moving shaft 12 to move upward. At the same time, the upper mold 4, which is fixed to the upper moving shaft 12, moves upward, so that the upper mold 4 and the lower mold 5 move in opposite directions.

[0040] Since the inner cavity of the casting mold has multiple curved surfaces, when liquid metal is poured in, the fluidity of the liquid metal decreases and the flow rate slows down when it flows through areas with large curvature. In order to accelerate the flow rate of the liquid metal and prevent the liquid metal from cooling and solidifying prematurely due to the slow flow rate, which would cause porosity or dimensional deviation in the casting blank, in this invention, a pouring funnel 19 is provided on the front side of the pouring port 10 of the lower mold 5. The upper end of the pouring funnel 19 is open, and the inner cavity of the pouring funnel 19 is connected to the pouring port 10. A flipping mechanism is provided on the rear side of the support frame 3. The flipping mechanism is used to flip the vertically set support frame 3 to a horizontal setting, and the pouring port 10 is rotated to the opening facing upward. The liquid metal in the inner cavity of the casting mold is accelerated to flow rapidly away from the pouring port 10 by the gravity of the liquid metal.

[0041] In this embodiment, the flipping mechanism includes a drive cylinder 20. The fixed end of the drive cylinder 20 is hinged to the rear of the support base 1, and the moving end of the drive cylinder 20 is hinged to the rear of the support frame 3. The hinge position is above the support shaft 21.

[0042] To further accelerate the flow rate of liquid metal and ensure that the liquid metal is evenly distributed within the mold cavity;

[0043] In this invention, both the upper end of the upper mold 4 and the lower end of the lower mold 5 are provided with negative pressure driving mechanisms. The negative pressure driving mechanisms are used to continuously generate negative pressure in the inner cavity of the casting mold during the flipping process of the support frame 3, so that the liquid metal is evenly distributed in the inner cavity of the casting mold by atmospheric pressure.

[0044] In this embodiment, the negative pressure drive mechanism includes a plurality of upper piston receiving holes 22 respectively provided in the upper mold 4 and a plurality of lower piston receiving holes 23 respectively provided in the lower mold 5. Each set of upper piston receiving holes 22 is coaxially opened on the upper part of the corresponding upper demolding through hole 6. An upper piston 24 is slidably and sealed in the upper piston receiving hole 22, and the upper demolding rod 7 slides through the corresponding upper piston 24.

[0045] Each set of lower piston receiving holes 23 is coaxially opened at the lower part of the corresponding lower demolding through hole 8. The lower piston 25 is slidably and sealingly arranged in the lower piston receiving hole 23. The lower demolding rod 9 slides through the corresponding lower piston 25. Several upper pistons 24 are fixed to the lower end face of the upper support plate 26. Several lower pistons 25 are fixed to the upper end face of the lower support plate 27. The upper support plate 26 and the lower support plate 27 are fixed to the left and right sides of the front part of the upper support plate 26 and the lower support plate 27, and the left and right sides are fixed with horizontally arranged upper guide rods 28 and lower guide rods 28. Rod 29, each set of upper guide rods 28 is rotatably connected to upper connecting rod 30, and lower guide rod 29 is rotatably connected to lower connecting rod 31. The lower end of upper connecting rod 30 and the upper end of lower connecting rod 31 are hinged by connecting post 35. Upper connecting rod 30 and lower connecting rod 31 are at a set angle (e.g., 120 degrees) and connecting post 35 is always behind upper guide rod 28 and lower guide rod 29; therefore, by changing the included angle of upper connecting rod 30 and lower connecting rod 31, upper guide rod 28 and lower guide rod 29 can move in opposite directions.

[0046] In order to change the included angle between the upper connecting rod 30 and the lower connecting rod 31 by driving the connecting post 35 to move forward, in this embodiment, a pressing part is provided on the rear side of the connecting post 35. The pressing part is used to drive the connecting post 35 to move forward. By moving the connecting post 35 forward, the included angle between the upper connecting rod 30 and the lower connecting rod 31 is changed. The upper guide rod 28 and the lower guide rod 29, which are rotatably connected to the upper end of the upper connecting rod 30 and the lower end of the lower connecting rod 31 respectively, will move in opposite directions. The upper support plate 26 and the lower support plate 27 connected by rod 29 drive the upper piston 24 and the lower piston 25 to move in opposite directions, respectively. The movement of the upper piston 24 and the lower piston 25 in opposite directions generates negative pressure in the upper piston receiving hole 22 and the lower piston receiving hole 23. Since the upper demolding rod 7 and the lower demolding rod 9 are respectively clearance-fitted with the upper demolding hole and the lower demolding through hole 8, the negative pressure is transmitted to the inner cavity of the casting mold through the upper demolding hole and the lower demolding through hole, respectively, so that the external atmospheric pressure drives the liquid metal to flow into the inner cavity of the casting mold.

[0047] When the connecting column 35 is reset to its rearward position, the upper guide rod 28 and the lower guide rod 29, which are rotatably connected to the upper end of the upper connecting rod 30 and the lower end of the lower connecting rod 31, will move towards each other; the upper support plate 26 and the lower support plate 27, which are connected to the upper guide rod 28 and the lower guide rod 29, will drive the upper piston 24 and the lower piston 25 to move towards each other; the back-to-back movement of the upper piston 24 and the lower piston 25 will generate positive pressure in the upper piston receiving hole 22 and the lower piston receiving hole 23, and the positive pressure will promote the separation of the casting blank from the inner cavity of the casting mold.

[0048] In this embodiment, the extrusion part includes a cam 32 disposed on the rear side of the connecting column 35 and a transmission rod fixed coaxially with the base circle of the cam 32. The transmission rod passes through the side wall of the support frame 3 and the rotating shaft 11 on the corresponding side in sequence and is coaxially disposed with the rotating shaft 11. The transmission rod is rotatably connected to both the support frame 3 and the rotating shaft 11. A swing gear 33 is coaxially fixed at the outer end of the transmission rod. A fixed gear 34 meshes below the swing gear 33. The fixed gear 34 is coaxially disposed with the support shaft 21 and is rotatably connected with the support shaft 21. The lower part of the fixed gear 34 is fixed to the inner side of the vertical support 2 on the corresponding side.

[0049] During operation, when the support frame 3 is driven by the drive cylinder 20 to flip backward about the support shaft 21, the rotating shaft 11 and the transmission rod coaxially arranged with the rotating shaft 11 on the outer side of the support frame 3 flip backward, and the swing gear 33 fixed coaxially with the transmission rod flips backward. Since the support shaft 21 is coaxially arranged with the fixed gear 34, the swing gear 33 meshing with the fixed gear 34 rotates around the fixed gear 34. The meshing position of the swing gear 33 and the fixed gear 34 begins to change, that is, the fixed gear 34 and the swing gear 33 generate relative motion. The swing gear 33 begins to rotate, and the cam 32 fixedly connected to the swing gear 33 rotates accordingly, driving the connecting column 35 to move forward.

[0050] In this embodiment, when the support frame 3 is set vertically, the contact point between the connecting column 35 and the cam 32 is at the near end of the push stroke of the cam 32 (the point on the push stroke surface closest to the center of the base circle). When the support frame 3 is set horizontally, the contact point between the connecting column 35 and the cam 32 is at the far end of the push stroke of the cam 32 (the point on the push stroke surface farthest from the center of the base circle).

[0051] In order to keep the connecting column 35 in close contact with the circumference of the cam 32, in this embodiment, an upper return spring 36 and a lower return spring 37 are coaxially sleeved on the outside of each set of upper piston 24 and lower piston 25, respectively. The upper support plate 26 and the upper mold 4 are fixed at the upper and lower ends of the upper return spring 36, respectively; the lower mold 5 and the lower support plate 27 are fixed at the upper and lower ends of the lower return spring 37, respectively, and each set of upper return spring 36 and lower return spring 37 is in a stretched state.

[0052] During operation, the drive cylinder 15 drives the lower mold 5 to move upward, and the lower moving shaft 13, which is fixed to the lower mold 5, moves upward. The upward movement of the lower moving shaft 13 drives the lower end of the first connecting rod 16 to move upward. The first connecting rod 16 rotates around the rotating shaft 11, and the upper end of the first connecting rod 16 moves downward. The upper end of the first connecting rod 16 drives the upper moving shaft 12 to move downward. At the same time, the upper mold 4, which is fixed to the upper moving shaft 12, moves downward, so that the upper mold 4 and the lower mold 5 move towards each other. At this time, the molten metal that meets certain requirements is poured into the casting funnel 19. The molten metal flows along the pouring port 10 at the lower end of the casting funnel 19 into the inner cavity of the casting mold.

[0053] Simultaneously, the drive cylinder 20 drives the support frame 3 to rotate backward about the support shaft 21. The rotating shaft 11 on the side of the support frame 3 drives the transmission rod to rotate backward. The swing gear 33, which is fixed coaxially with the transmission rod, rotates backward. The swing gear 33, which meshes with the fixed gear 34, rotates circumferentially around the fixed gear 34. Due to the relative motion between the fixed gear 34 and the swing gear 33, the swing gear 33 begins to rotate. The cam 32, which is fixedly connected to the swing gear 33, rotates accordingly. The contact point between the connecting column 35 and the cam 32 moves from the near end of the push stroke to the far end of the push stroke, and drives the connecting column 35 to rotate. The column 35 moves forward, and the upper guide rod 28 and lower guide rod 29, which are rotatably connected to the upper end of the upper connecting rod 30 and the lower end of the lower connecting rod 31, move in opposite directions; the upper piston 24 and lower piston 25, which are connected to the upper guide rod 28 and lower guide rod 29, move in opposite directions; the movement of the upper piston 24 and lower piston 25 in opposite directions generates negative pressure in the upper piston receiving hole 22 and lower piston receiving hole 23. During the flipping process of the support frame 3, negative pressure is continuously generated in the inner cavity of the casting mold, and the liquid metal is evenly distributed in the inner cavity of the casting mold by atmospheric pressure; until the hot metal is cooled and solidified to form a casting blank with a predetermined shape.

[0054] At this time, the drive cylinder 20 drives the support frame 3 to rotate in the opposite direction until the support frame 3 returns to the vertical position. At the same time as the support frame 3 rotates in the opposite direction, the swing gear 33 rotates in the opposite direction, and the cam 32 fixed to the swing gear 33 rotates in the opposite direction. The contact point between the connecting column 35 and the cam 32 moves from the far end of the push stroke to the near end of the push stroke. The upper guide rod 28 and the lower guide rod 29, which are rotatably connected to the upper end of the upper connecting rod 30 and the lower end of the lower connecting rod 31, move towards each other. The upper piston 24 and the lower piston 25, which are connected to the upper guide rod 28 and the lower guide rod 29, move towards each other. A positive pressure is formed between the casting blank and the inner cavity of the casting mold, which promotes the separation of the casting blank from the inner cavity of the casting mold.

[0055] Next, the drive cylinder 15 drives the lower mold 5 to move downward, and the lower moving shaft 13, which is fixed to the lower mold 5, moves downward. The downward movement of the lower moving shaft 13 drives the lower end of the first connecting rod 16 to move downward. The first connecting rod 16 rotates in the opposite direction about the rotating shaft 11, and the upper end of the first connecting rod 16 moves upward. The upper end of the first connecting rod 16 drives the upper moving shaft 12 to move upward. At the same time, the upper mold 4, which is fixed to the upper moving shaft 12, moves upward, realizing that the upper mold 4 and the lower mold 5 move in opposite directions. The upper mold 4 and the lower mold 5 move in opposite directions synchronously, and the lower end of the fixed upper demolding rod 7 moves relative to the upper mold 4 until the lower end of the upper demolding rod 7 passes through the upper mold 4. The casting blank that is stuck to the inner cavity of the upper mold 4 is separated from the inner cavity of the upper mold 4 under the pressure of the lower end of the upper demolding rod 7.

[0056] Simultaneously, the upper end of the fixed lower demolding rod 9 moves relative to the lower mold 5 until the upper end of the lower demolding rod 9 passes through the lower mold 5; the casting blank, which is adhered to the inner cavity of the lower mold 5, is separated from the inner cavity of the upper mold 4 under the pressure of the upper end of the lower demolding rod 9; the casting blank is located between the upper demolding rod 7 and the lower demolding rod 9, and under the action of gravity, the lower side of the casting blank contacts the top of the lower demolding rod 9, and technicians can quickly remove the casting blank using special tools (clamps).

Claims

1. An exhaust manifold casting device, characterized in that: The system includes a support base with a set of vertical supports on both the left and right sides. A support frame is rotatably connected between the two sets of vertical supports. A casting mold is slidably installed inside the support frame. The casting mold includes an upper mold and a lower mold that are arranged vertically and correspondingly. Several sets of upper and lower demolding through holes are vertically and evenly distributed in the middle of the upper and lower molds. An upper demolding rod and a lower demolding rod are coaxially installed in each set of upper and lower demolding through holes. The upper and lower demolding rods are clearance-fitted with the upper and lower demolding through holes, respectively. Each set of upper and lower demolding rods is fixed to the top and bottom of the support frame, respectively. A pouring gate is also provided at the front end of the lower mold. The pouring gate penetrates the front side wall of the lower mold and communicates with the inner cavity of the lower mold.

2. The exhaust manifold casting device according to claim 1, characterized in that: The casting mold is equipped with a synchronous linkage mechanism on both the left and right sides. The synchronous linkage mechanism is used to make the upper mold and the lower mold move synchronously towards or away from each other. A driving cylinder is provided on the lower side of the lower mold. The fixed end of the driving cylinder fixes the lower end face of the support frame, and the moving end of the driving cylinder fixes the lower end face of the lower mold.

3. The exhaust manifold casting device according to claim 2, characterized in that: Each set of synchronous linkage mechanisms includes a horizontally arranged rotating shaft and an upper moving shaft and a lower moving shaft arranged parallel to each other above and below the rotating shaft; the outer end of the rotating shaft is fixed to the middle of the upper and lower connecting rods, and the upper and lower ends of the first connecting rods are rotatably connected to the upper and lower moving rods, respectively. The upper end of the upper moving rod and the lower end of the lower moving rod are rotatably connected to the outer ends of the upper and lower moving shafts, respectively; the inner ends of the upper and lower moving shafts are fixedly connected to the upper mold and the lower mold, respectively; the rotating shaft is rotatably arranged on the outside of the corresponding support frame; the first connecting rod is at a set angle to the upper moving rod and the lower moving rod, respectively.

4. The exhaust manifold casting device according to claim 1, characterized in that: The flipping mechanism includes a drive cylinder, with the fixed end of the drive cylinder hinged to the rear of the support base and the moving end of the drive cylinder hinged to the rear side of the support frame. The hinge position is above the support shaft.

5. The exhaust manifold casting device according to claim 3, characterized in that: Both the upper end of the upper mold and the lower end of the lower mold are equipped with negative pressure driving mechanisms. The negative pressure driving mechanisms are used to continuously generate negative pressure in the inner cavity of the casting mold during the flipping process of the support frame.

6. The exhaust manifold casting device according to claim 5, characterized in that: The negative pressure drive mechanism includes several upper piston receiving holes in the upper mold and several lower piston receiving holes in the lower mold. Each set of upper and lower piston receiving holes is coaxially opened at the upper part of the corresponding upper demolding through hole and the lower part of the corresponding lower demolding through hole. Upper and lower pistons are respectively sealed and slidably arranged in the upper and lower piston receiving holes, and upper and lower demolding rods slide through the corresponding upper and lower pistons. Several upper and lower pistons are respectively fixed on the lower end face of the upper support plate and the upper end face of the lower support plate. Upper and lower guide rods are fixed horizontally on the left and right sides of the front part of the upper and lower support plates. Each set of upper and lower guide rods is rotatably connected to an upper connecting rod and a lower connecting rod. The lower end of the upper connecting rod and the upper end of the lower connecting rod are hinged by a connecting column. The upper and lower connecting rods are at a set angle and the connecting column is always behind the upper and lower guide rods.

7. The exhaust manifold casting apparatus according to claim 6, characterized in that: The connecting column is provided with a pressing part on its rear side, which is used to drive the connecting column to move forward.

8. The exhaust manifold casting device according to claim 7, characterized in that: The extrusion section includes a cam located on the rear side of the connecting column and a transmission rod fixed coaxially with the base circle of the cam. The transmission rod passes through the side wall of the support frame and the rotating shaft on the corresponding side in sequence and is coaxially arranged with the rotating shaft. The transmission rod is rotatably connected to both the support frame and the rotating shaft. A swing gear is coaxially fixed to the outer end of the transmission rod. A fixed gear meshes below the swing gear. The fixed gear is coaxially arranged with the support shaft and is rotatably connected to the support shaft. The lower part of the fixed gear is fixed to the inner side of the vertical support on the corresponding side.

9. The exhaust manifold casting device according to claim 8, characterized in that: When the support frame is set vertically, the contact point between the connecting column and the cam is at the near end of the cam's push stroke. When the support frame is set horizontally, the contact point between the connecting column and the cam is at the far end of the cam's push stroke.

10. The exhaust manifold casting device according to claim 6, characterized in that: Each set of upper and lower pistons is coaxially fitted with an upper return spring and a lower return spring, respectively. The upper and lower ends of the upper return spring are fixed to the upper support plate and the upper mold, respectively; the upper and lower ends of the lower return spring are fixed to the lower mold and the lower support plate, respectively, and each set of upper and lower return springs is in a stretched state.

Images