Valve casting mold with demolding ejection mechanism

Abstract

The invention discloses a valve casting mold with a demolding ejection mechanism, and belongs to the technical field of valve casting. The upper die is arranged at the end, away from the hydraulic cylinder, of the lifting column, the first lower die and the second lower die are arranged at the top of the die table, and the ejector plate is arranged between the first lower die and the second lower die. A series of actions such as opening / closing of the upper die, separating / closing of the lower die and ejection of a workpiece by the ejection plate can be completed synchronously, and lifting motion of the upper die is converted into rotating power of the bidirectional lead screw through meshing transmission of the rack and the gear disc, so that the lower die is driven to move; by means of linkage of the first force arm, the second force arm and the push rod, the separation action of the lower die is converted into ejection power of the ejection plate, other power devices do not need to be additionally arranged, the manufacturing cost of equipment is reduced, energy consumption is reduced, a coherent automatic production process is formed, the production period is shortened, and the production efficiency in unit time is improved.

Description

Technical Field

[0001] This invention relates to the field of valve casting technology, and in particular to a valve casting mold with a demolding ejection mechanism. Background Technology

[0002] Traditional valve casting molds typically consist of an upper mold and a lower mold. Molten material is poured into the mold after it is closed, and the mold is opened to remove the part after the material cools and solidifies. However, current valve casting molds have many shortcomings in use.

[0003] On the one hand, the demolding process often requires manual assistance or the addition of complex ejection mechanisms, which not only increases the intensity of manual labor but also easily leads to workpiece damage due to improper operation, affecting product quality and production efficiency. On the other hand, existing mold opening and ejection actions are mostly driven by independent power units, such as hydraulic cylinders and air cylinders, which not only increases the manufacturing cost and energy consumption of the equipment but also makes the mold structure more complex, with poor coordination between components, making it prone to failure and reducing production stability.

[0004] Furthermore, some molds have poorly designed guide structures, which can easily lead to misalignment during mold closing and opening, resulting in accelerated mold wear, shortened mold lifespan, and impact on the dimensional accuracy of castings. Moreover, for mass production, traditional molds have a low degree of automation, making it difficult to meet the demands of efficient and continuous production, thus hindering the development of the valve manufacturing industry.

[0005] Therefore, developing a valve casting mold that can achieve coordinated opening and ejection actions, has a compact structure, a high degree of automation, and a low cost has become an urgent problem to be solved in the current valve manufacturing field. Summary of the Invention

[0006] The purpose of this invention is to provide a valve casting mold with a demolding and ejection mechanism to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a valve casting mold with a demolding ejection mechanism, comprising a mold platform, a top plate above the mold platform, a hydraulic cylinder in the middle of the top surface of the top plate, a lifting column of the hydraulic cylinder passing through the top plate and vertically downward, an upper mold at the end of the lifting column away from the hydraulic cylinder, a first lower mold and a second lower mold at the top of the mold platform, and an ejection plate between the first lower mold and the second lower mold.

[0008] Furthermore, a first moving part is provided on one side of the first lower mold, and a second moving part is provided on the same side of the second lower mold. Both the first and second moving parts have threaded holes at their tops, and a bidirectional lead screw is provided in the threaded holes. The two sides of the bidirectional lead screw have threads running in opposite directions. The first and second moving parts are respectively connected to the threads running in opposite directions through the threaded holes. A first lever arm is connected to the first moving part through a pin, and a second lever arm is connected to the second moving part through a pin. The first lever arm and the second lever arm are connected by a pin. At the bottom of the connection between the first lever arm and the second lever arm, a push rod is connected by the same pin. The end of the push rod away from the pin is connected to the ejector plate.

[0009] Furthermore, the mold platform is symmetrically provided with two side supports on the same side as the bidirectional lead screw. The two ends of the bidirectional lead screw are rotatably connected between the side supports. One end of the bidirectional lead screw is provided with a gear disk. The side of the upper mold near the gear disk is provided with a transverse connecting frame. The end of the transverse connecting frame near the gear disk is connected with a rack. The rack teeth mesh with the gear teeth of the gear disk.

[0010] Furthermore, a guide sleeve is provided on the side support, and the rack is slidably disposed inside the guide sleeve. A guide ring is provided in the middle of the side of the mold table near the ejector plate. The size of the guide ring matches the push rod, and the push rod is slidably disposed inside the guide ring.

[0011] Furthermore, the top of the upper mold is provided with an injection port, and the interiors of the upper mold, the first lower mold, and the second lower mold are provided with matching and combinable mold grooves, with the injection port extending into the interior of the mold groove.

[0012] Furthermore, the bottom surfaces of the first and second lower molds are provided with guide grooves, and the top of the mold platform is provided with guide rails. The guide rails are arranged in pairs, and a set of guide rails is provided on the left and right sides of the top of the mold platform. The two guide rails in a set are arranged in parallel, and the size of the guide grooves matches the guide rails. The first and second lower molds are slidably mounted on the guide rails on both sides of the mold platform through the guide grooves.

[0013] Furthermore, the mold platform is provided with at least two support frames on its periphery, the support frames are fixedly connected to the mold platform, and the top plate is fixedly connected to the top of the support frames.

[0014] Furthermore, the top plate is provided with guide holes, and the top of the upper mold is provided with no less than two guide pillars. The size, position and number of the guide pillars correspond one-to-one with the guide holes. The guide pillars slide through the guide holes, and a limit block is provided at the top end of the guide pillar that passes through the guide hole. The diameter of the limit block is larger than the inner diameter of the guide hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The mold of the present invention relies solely on a single power source—a hydraulic cylinder that drives the upper mold to lift and lower—to simultaneously complete a series of actions, including opening / closing the upper mold, separating / closing the lower mold, and ejecting the workpiece from the ejector plate. Through the meshing transmission of the rack and pinion, the lifting motion of the upper mold is converted into the rotational power of the bidirectional lead screw, which in turn drives the movement of the lower mold. Furthermore, with the linkage of the first lever arm, the second lever arm, and the push rod, the separation action of the lower mold is converted into the ejection power of the ejector plate. No additional power device is required, which not only reduces the manufacturing cost of the equipment but also lowers energy consumption. The lifting action of the upper mold automatically triggers the opening and closing of the lower mold and the ejection action of the ejector plate, forming a continuous automated production process. The entire process requires no manual intervention, greatly shortening the production cycle and improving the production efficiency per unit time.

[0017] 2. The various actions of the mold in this invention are automated and linked. The operator only needs to inject material into the injection port and collect the ejected workpiece. There is no need to participate in the tedious operations such as mold opening and closing and workpiece removal. This not only simplifies the operation process, but also reduces the intensity of manual labor and reduces the risk of production accidents or workpiece damage caused by improper manual operation, thus ensuring the safety and stability of production. The mold is equipped with multiple guide structures, which makes the movement of each component more stable and reliable. It avoids the impact of component shaking or offset on the mold closing accuracy or workpiece forming quality. The bidirectional lead screw drives the lower mold to move through the opposite direction of the thread, ensuring the synchronicity of the separation and closing of the two lower molds, further ensuring the working accuracy of the mold. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the mold closing state structure of the present invention;

[0020] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram;

[0021] Figure 4 This is a schematic diagram of the ejection state structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the mold structure of the present invention.

[0023] In the diagram: 1. Mold table; 2. Support frame; 3. Top plate; 4. Hydraulic cylinder; 5. Upper mold; 6. First lower mold; 7. Second lower mold; 8. Guide pillar; 9. Injection port; 10. Lifting column; 11. First moving part; 12. Second moving part; 13. First lever arm; 14. Second lever arm; 15. Push rod; 16. Ejector plate; 17. Double-acting lead screw; 18. Side support frame; 19. Horizontal connecting frame; 20. Rack; 21. Gear disk; 22. Guide sleeve; 23. Guide rail; 24. Guide groove; 25. Mold groove; 26. Guide ring. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-5 The present invention provides the following technical solutions:

[0026] A valve casting mold with a demolding ejection mechanism includes a mold platform 1, a top plate 3 above the mold platform 1, a hydraulic cylinder 4 in the middle of the top surface of the top plate 3, a lifting column 10 of the hydraulic cylinder 4 passing through the top plate 3 and vertically downward, an upper mold 5 at the end of the lifting column 10 away from the hydraulic cylinder 4, a first lower mold 6 and a second lower mold 7 on the top of the mold platform 1, an ejection plate 16 between the first lower mold 6 and the second lower mold 7, and at least two support frames 2 on the periphery of the mold platform 1, the support frames 2 being fixedly connected to the mold platform 1, and the top plate 3 being fixedly connected to the top of the support frames 2. The top plate 3 has guide holes, and the top of the upper mold 5 has at least two guide pillars 8. The size, position and number of the guide pillars 8 correspond one-to-one with the guide holes. The guide pillars 8 slide through the guide holes. A limit block is set at the top of the guide pillar 8 at the end that passes through the guide hole. The diameter of the limit block is larger than the inner diameter of the guide hole. When working, the hydraulic cylinder 4 drives the lifting column 10 to cover the top of the first lower mold 6 and the second lower mold 7 with the upper mold 5, forming a complete valve casting mold. At this time, material is injected into the mold to form the mold. After forming, the hydraulic cylinder 4 drives the lifting column 10 to raise the upper mold 5 along the direction of the guide pillars 8. At the same time, the first lower mold 6 and the second lower mold 7 open, and the ejector plate 16 ejects the formed valve workpiece from the mold, completing the demolding and ejection.

[0027] Specifically, the precise fit between the guide pillars and guide holes provides stable guidance for the lifting and lowering of the upper mold, ensuring that the upper mold will not deviate during movement and guaranteeing the accuracy during mold closing, thereby improving the forming quality of the valve workpiece. The setting of the limit block effectively prevents the guide pillars from disengaging from the guide holes, enhancing the safety and reliability of mold operation. The support frame provides stable support to the top plate, making the entire mold structure more robust, able to withstand the pressure generated during the casting process, and extending the service life of the mold.

[0028] The top of the upper mold 5 is provided with a filling port 9. The upper mold 5, the first lower mold 6 and the second lower mold 7 are provided with matching and combinable mold grooves 25. The filling port 9 extends into the interior of the mold groove 25. The bottom surfaces of the first lower mold 6 and the second lower mold 7 are provided with guide grooves 24, and the top of the mold platform 1 is provided with guide rails 23. The guide rails 23 are arranged in pairs, and a set of guide rails 23 is provided on the left and right sides of the top of the mold platform 1. The two guide rails 23 in a set are arranged in parallel. The size of the guide groove 24 matches the guide rail 23. The first lower mold 6 and the second lower mold 7 are slidably set on the guide rails 23 on both sides of the mold platform 1 through the guide grooves 24. When filling the mold groove 25 with material, the material is injected through the injection port 9. When demolding, after the upper mold 5 rises, the first lower mold 6 and the second lower mold 7 move along the guide rails 23 to the left and right sides of the top of the mold platform 1. At this time, the mold as a whole, consisting of the upper mold 5, the first lower mold 6 and the second lower mold 7, is opened, and the valve workpiece inside is ejected onto the mold platform 1 by the action of the ejector plate 16 for collection by the staff.

[0029] Specifically, the injection port extends into the mold groove, ensuring precise material injection, reducing material waste, and facilitating uniform material distribution within the mold groove, thus improving the molding effect of the valve workpiece. The cooperation between the guide rails and guide grooves provides a stable track for the movement of the first and second lower molds, making the opening and closing of the lower molds smoother and preventing jamming during movement, thereby improving demolding efficiency. The two sets of parallel guide rails further enhance the stability of the lower mold movement, ensuring accuracy during mold opening and closing.

[0030] A first moving part 11 is provided on one side of the first lower die 6, and a second moving part 12 is provided on the same side of the second lower die 7. Both the first moving part 11 and the second moving part 12 have threaded holes at their tops, and a double-acting lead screw 17 is installed inside the threaded holes. The double-acting lead screw 17 has threads running in opposite directions on both sides. The first moving part 11 and the second moving part 12 are respectively connected to the threads running in opposite directions through the threaded holes. A first lever arm 13 is connected to the first moving part 11 via a pin, and a second lever arm 14 is connected to the second moving part 12 via a pin. The first lever arm 13 and the second lever arm 14 are connected by a shaft. The first lever arm 13 and the second lever arm 14 are connected by a pin. The bottom of the connection point is connected to a push rod 15 by the same pin. The end of the push rod 15 away from the pin is connected to the ejector plate 16. When the upper mold 5 rises and opens, it drives the bidirectional lead screw 17 to rotate. When the bidirectional lead screw 17 rotates, it drives the first moving part 11 and the second moving part 12 to move in opposite directions using threads with opposite directions. When the first moving part 11 and the second moving part 12 move horizontally, they drive the first lower mold 6 and the second lower mold 7 to move on the mold table 1, thereby opening the first lower mold 6 and the second lower mold 7. Conversely, when the upper mold 5 falls, it drives the first lower mold 6 and the second lower mold 7 to close.

[0031] When the first lower mold 6 and the second lower mold 7 are opened, the increased distance between the two lower molds causes the first lever arm 13 and the second lever arm 14 to unfold, thereby pushing the push rod 15 at the connection between the first lever arm 13 and the second lever arm 14 inward. When the push rod 15 is pushed, the ejector plate 16 pushes the valve workpiece inside the mold onto the mold table 1, completing the demolding and ejection for collection by the staff. No additional power other than the hydraulic cylinder 4 is needed to drive the workpiece to be ejected.

[0032] Specifically, the opposing thread design on both sides of the bidirectional lead screw enables the first and second moving parts to move precisely in opposite or the same direction during rotation, thus achieving stable opening and closing of the first and second lower dies and ensuring the accuracy of the mold movements. The connection between the first and second lever arms and the push rod converts the movement of the lower die into the ejection power of the ejector plate, achieving a clever linkage of the mechanical structure. This eliminates the need for an additional power source, simplifies the mold structure, and reduces costs. The pin connection method makes the relative movement between components more flexible, reduces mechanical wear, and improves the mold's service life. The change in distance during lower die opening drives the lever arm to unfold, which in turn pushes the push rod and ejector plate to eject the workpiece. This achieves synchronous linkage between the demolding action and the lower die opening and closing action, requiring no additional power, saving energy, and improving production efficiency. This linkage design automates the demolding process, reduces manual operation, lowers labor intensity, and avoids workpiece damage caused by improper manual demolding, ensuring product quality.

[0033] Two side supports 18 are symmetrically arranged on the same side as the double-acting lead screw 17 on the mold table 1. The two ends of the double-acting lead screw 17 are rotatably connected between the side supports 18. A gear disk 21 is provided at one end of the double-acting lead screw 17. A transverse connecting frame 19 is provided on the side of the upper mold 5 near the gear disk 21. A rack 20 is connected to the end of the transverse connecting frame 19 near the gear disk 21. The rack teeth of the rack 20 mesh with the gear teeth of the gear disk 21. A guide sleeve 22 is provided on the side support 18, and a rack 20 is slidably disposed inside the guide sleeve 22. A guide ring 26 is provided in the middle of the side of the mold table 1 near the ejector plate 16. The size of the guide ring 26 matches the push rod 15. The push rod 15 is slidably disposed inside the guide ring 26. When the hydraulic cylinder 4 drives the lifting column 10 to raise the upper mold 5 along the direction of the guide column 8, the upper mold 5 simultaneously raises the horizontal connecting frame 19 horizontally. At this time, the rack 20 at the end of the horizontal connecting frame 19 rises synchronously. The rise of the rack 20 drives the gear disk 21 to rotate. The rotation of the gear disk 21 drives the double-acting screw 17 to rotate, thereby using the double-acting screw 17 to drive the first lower mold 6 and the second lower mold 7 to open. At the same time, it drives the push rod 15 to push the ejector plate 16 to eject the valve workpiece. No additional power other than the hydraulic cylinder 4 is needed to drive the first lower mold 6 and the second lower mold 7 to open.

[0034] Specifically, the side support provides stable support for the bidirectional lead screw, ensuring its stability and accuracy during rotation. The meshing transmission between the gear disc and rack precisely converts the lifting motion of the upper die into the rotational motion of the bidirectional lead screw, achieving efficient power transmission and ensuring the synchronization of the lower die opening and closing action with the upper die lifting action. The guide sleeve guides the rack, ensuring its stability during sliding and preventing rack misalignment from affecting gear meshing, thus improving transmission efficiency. The guide ring guides the push rod, making its pushing action smoother and more precise, ensuring the ejector plate accurately ejects the workpiece and improving demolding reliability.

[0035] In the above embodiments, efficient reuse of power is achieved, reducing equipment costs and energy consumption. The entire mold relies on only a single power source—the hydraulic cylinder that drives the upper mold to lift and lower—to simultaneously complete a series of actions, including opening / closing the upper mold, separating / closing the lower mold, and ejecting the workpiece from the ejector plate. Through the meshing transmission of the rack and pinion, the lifting motion of the upper mold is converted into the rotational power of the bidirectional lead screw, which in turn drives the movement of the lower mold. Furthermore, with the linkage of the first lever arm, the second lever arm, and the push rod, the separation action of the lower mold is converted into the ejection power of the ejector plate. No additional power devices are required, which not only reduces the manufacturing cost of the equipment but also lowers energy consumption, conforming to the concept of high-efficiency and energy-saving production.

[0036] The lifting and lowering of the upper mold, through the orderly coordination of a series of mechanical structures, automatically triggers the opening and closing of the lower mold and the ejection action of the ejector plate, forming a continuous automated production process. After the valve workpiece is formed, the lower mold automatically separates when the upper mold rises, and the ejector plate ejects the workpiece at the same time. The entire process requires no manual intervention, greatly shortening the production cycle and improving the production efficiency per unit time, making it especially suitable for mass production scenarios.

[0037] Because the mold's various actions are automated and interconnected, workers only need to inject material into the injection port and collect the ejected workpieces, eliminating the need for tedious operations such as mold opening and closing and workpiece removal. This not only simplifies the operation process but also reduces the intensity of manual labor, minimizing the risk of production accidents or workpiece damage caused by improper manual operation, thus ensuring the safety and stability of production.

[0038] The mold incorporates multiple guiding structures. For example, the cooperation between guide pillars and guide holes ensures the precision of upper mold lifting; the cooperation between guide rails and guide grooves ensures the smooth movement of lower mold; the guiding effect of guide sleeves on racks and guide rings on push rods further stabilizes and reliably the movement of each component, preventing wobble or misalignment from affecting mold closing accuracy or workpiece forming quality. Furthermore, a bidirectional lead screw drives the lower mold to move via oppositely directed threads, ensuring the synchronicity of the separation and closing of the two lower molds, further guaranteeing the mold's working accuracy.

[0039] The various components are interconnected through ingenious connection methods, such as the pin connections between lever arms and the direct connection between the push rod and the ejector plate. This results in a rational and compact structural layout for the entire mold, without requiring excessive production space. For companies with limited production workshop space, this effectively saves space resources and improves the utilization rate of the workshop.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A valve casting mold with a demolding and ejection mechanism, comprising a mold table (1), characterized in that, A top plate (3) is provided above the mold platform (1). A hydraulic cylinder (4) is provided in the middle of the top surface of the top plate (3). The lifting column (10) of the hydraulic cylinder (4) passes through the top plate (3) and is set vertically downward. An upper mold (5) is provided at the end of the lifting column (10) away from the hydraulic cylinder (4). A first lower mold (6) and a second lower mold (7) are provided on the top of the mold platform (1). An ejector plate (16) is provided between the first lower mold (6) and the second lower mold (7).

2. A valve casting mold with a demolding and ejection mechanism as described in claim 1, characterized in that, A first moving part (11) is provided on one side of the first lower mold (6), and a second moving part (12) is provided on the same side of the second lower mold (7) as the first moving part (11). The top of the first moving part (11) and the second moving part (12) are both provided with threaded holes, and a double-acting screw (17) is provided in the threaded holes. The two sides of the double-acting screw (17) are provided with threads in opposite directions. The first moving part (11) and the second moving part (12) are respectively connected to the threads in opposite directions through the threaded holes. A first lever arm (13) is connected to the first moving part (11) through a shaft pin, and a second lever arm (14) is connected to the second moving part (12) through a shaft pin. The first lever arm (13) and the second lever arm (14) are connected by a shaft pin. The bottom of the connection between the first lever arm (13) and the second lever arm (14) is connected to a push rod (15) through the same shaft pin. The end of the push rod (15) away from the shaft pin is connected to the ejector plate (16).

3. A valve casting mold with a demolding and ejection mechanism as described in claim 2, characterized in that, The mold platform (1) is symmetrically provided with two side supports (18) on the same side as the bidirectional lead screw (17). The two ends of the bidirectional lead screw (17) are rotatably connected between the side supports (18). One end of the bidirectional lead screw (17) is provided with a gear disk (21). The upper mold (5) is provided with a transverse connecting frame (19) on the side near the gear disk (21). The end of the transverse connecting frame (19) near the gear disk (21) is connected with a rack (20). The rack teeth of the rack (20) mesh with the gear teeth of the gear disk (21).

4. A valve casting mold with a demolding and ejection mechanism as described in claim 3, characterized in that, The side support (18) is provided with a guide sleeve (22), and the rack (20) is slidably disposed inside the guide sleeve (22). A guide ring (26) is provided in the middle of the side of the mold table (1) near the ejector plate (16). The size of the guide ring (26) matches the push rod (15), and the push rod (15) is slidably disposed inside the guide ring (26).

5. A valve casting mold with a demolding and ejection mechanism as described in claim 1, characterized in that, The top of the upper mold (5) is provided with a filling port (9), and the upper mold (5), the first lower mold (6) and the second lower mold (7) are provided with matching and combinable mold grooves (25), and the filling port (9) extends into the interior of the mold groove (25).

6. A valve casting mold with a demolding and ejection mechanism as described in claim 5, characterized in that, The bottom surfaces of the first lower mold (6) and the second lower mold (7) are provided with guide grooves (24), and the top of the mold platform (1) is provided with guide rails (23). The guide rails (23) are arranged in pairs. A set of guide rails (23) is provided on the left and right sides of the top of the mold platform (1). The two guide rails (23) in a set are arranged in parallel. The size of the guide groove (24) matches the guide rail (23). The first lower mold (6) and the second lower mold (7) are slidably arranged on the guide rails (23) on both sides of the mold platform (1) through the guide grooves (24).

7. A valve casting mold with a demolding and ejection mechanism as described in claim 1, characterized in that, The mold platform (1) is provided with at least two support frames (2) on its periphery. The support frames (2) are fixedly connected to the mold platform (1), and the top plate (3) is fixedly connected to the top of the support frame (2).

8. A valve casting mold with a demolding and ejection mechanism as described in claim 1, characterized in that, The top plate (3) is provided with guide holes, and the top of the upper mold (5) is provided with no less than two guide pillars (8). The size, position and number of the guide pillars (8) correspond one-to-one with the guide holes. The guide pillars (8) slide through the guide holes. A limit block is provided at the top end of the guide pillar (8) that passes through the guide hole. The diameter of the limit block is greater than the inner diameter of the guide hole.

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