A hydraulic valve body casting equipment with mold closing function

Abstract

This invention discloses a hydraulic valve body casting equipment with a mold closing limitation function, specifically relating to the field of hydraulic valve body casting. It includes a lower mold frame, an upper mold frame, a hanging beam, a guide post, and a sand core. The upper mold frame is positioned above the lower mold frame, and the hanging beam is fixedly connected to both sides of the lower and upper mold frames. The anti-collision positioning mechanism employs an enlarged aperture design for the guide sleeve, reducing the probability of collision between the guide post and the guide sleeve during the movement of the upper mold frame. This prevents sand core from falling or being damaged due to collisions, reducing sand core loss and production costs. Simultaneously, to ensure positioning accuracy and improve molding quality, the combined design of enlarged guide sleeve aperture anti-collision and multiple anti-collision positioning mechanisms solves the problem of easy collision with traditional small-aperture guide sleeves. Furthermore, the coordinated clamping of three positioning plates achieves precise positioning of the guide post, ensuring the mold closing accuracy of the lower and upper mold frames, thereby improving the dimensional accuracy of the molded parts.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve body casting technology, and more specifically, to a hydraulic valve body casting equipment with a mold closing function. Background Technology

[0002] Hydraulic valve bodies are the core components of hydraulic systems. Their complex internal flow channels and stringent wall thickness precision requirements directly determine the pressure control stability, fluid transmission efficiency, and operational reliability of the hydraulic system. In the industrial sector, hydraulic valve bodies are widely used in heavy-duty, high-precision control applications such as engineering machinery, metallurgical equipment, and aerospace equipment. This places extremely high demands on the internal density, surface finish, and dimensional consistency of the castings. Currently, the mainstream casting processes for hydraulic valve bodies are sand casting and low-pressure casting. The mold-closing system of the casting equipment is a crucial core unit ensuring the quality of the casting. Its mold-closing accuracy, mold-closing force stability, and precise control of the mold-closing stroke directly affect the sealing effect of the mold cavity and the forming accuracy of the casting.

[0003] In existing technologies, the fit clearance design between the guide bushing and guide post in traditional mold closing and positioning structures is quite stringent, typically employing a small-diameter design close to an interference fit. The aim is to ensure mold closing accuracy through precise guidance. However, this design places extremely high demands on the alignment accuracy of the guide post and guide bushing. Even a slight misalignment during the guide post's downward movement will result in a hard collision with the guide bushing port. Furthermore, the guide bushing and lower mold frame are often rigidly connected without a buffer compensation structure. The impact force generated by the collision is directly transmitted to the sand core within the mold cavity. Since the sand core itself has low strength, this can lead to sand material falling off or overall damage. Existing designs... In the casting process, the upper mold frame is usually lifted and closed by a gantry frame and a chain drive. Since the chain itself is flexible, it is prone to slight shaking during the driving process due to uneven force and mechanical vibration. This causes the upper mold frame and the guide post fixed to its lower surface to shift. Although the amount of this shift is small, it is enough to cause the guide post and the guide sleeve to collide under the high precision requirements of traditional small-diameter guide sleeves. In addition, the positioning accuracy of the gantry frame drive system is limited, making it difficult to achieve absolute and precise alignment of the guide post and the guide sleeve, which further increases the risk of collision and thus affects the continuity of casting operations and the product qualification rate. Summary of the Invention

[0004] The present invention provides a hydraulic valve body casting equipment with mold closing limitation function. The problem to be solved is that in the traditional mold closing and positioning structure, the guide sleeve and guide post adopt a strict small-diameter fit design to ensure mold closing accuracy. However, this design requires extremely high alignment accuracy between the two. The upper mold frame is mostly driven by a gantry frame with iron chain for lifting. The flexibility of the iron chain is prone to uneven force and mechanical vibration, which can cause the guide post to shift, leading to collision between the guide post and the guide sleeve. In addition, the guide sleeve and the lower mold frame are rigidly connected without a buffer structure. The impact force generated by the collision will be directly transmitted to the sand core in the mold cavity, causing damage to the sand core and sand material to fall off, ultimately affecting the continuity of casting operation and the product qualification rate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic valve body casting equipment with mold closing limitation function, comprising a lower mold frame, an upper mold frame, a hanging beam, a guide post, and a sand core. The upper mold frame is disposed above the lower mold frame, the hanging beam is fixedly connected to both sides of the lower mold frame and the upper mold frame, the guide post is fixedly connected to the lower surface of the upper mold frame, and the sand core is disposed in the mold cavity of the lower mold frame and the upper mold frame.

[0006] It also includes an anti-collision positioning mechanism set on the lower mold frame. The anti-collision positioning mechanism includes a guide sleeve, a mounting frame, a first limiting plate, a first arc-shaped groove formed on the upper surface of the first limiting plate, a first limiting post, a first slider, a second slider, and a positioning plate. The guide sleeve is fixedly connected to the lower mold frame, and the mounting frame is fixedly connected to the guide sleeve. The first limiting plate is driven to rotate and is installed in the mounting frame. The first limiting post is movably installed in the first arc-shaped groove. The first slider is slidably installed in the mounting frame and fixedly connected to the first limiting post. The second slider is slidably installed on the first slider, and the positioning plate is fixedly installed on the second slider.

[0007] In a preferred embodiment, the anti-collision positioning mechanism further includes a servo motor, a first gear, and a second gear. The servo motor is fixedly connected to the lower surface of the mounting frame, and its output end extends upward into the interior of the mounting frame. The first gear and the second gear are both rotatably connected inside the mounting frame. The shaft of the first gear is fixedly connected to the output end of the servo motor. The first gear and the second gear mesh with each other, and the second gear is coaxially fixed with the first limiting plate.

[0008] In a preferred embodiment, the anti-collision positioning mechanism further includes a sliding column and a first spring. Three sliding columns and three first springs are provided respectively. The sliding column is fixedly connected to the first slider, and the second slider is slidably sleeved on the sliding column. The first spring is fixedly connected between the second slider and the first slider, and the first spring is sleeved on the outside of the sliding column.

[0009] In a preferred embodiment, the system further includes a shielding mechanism mounted on the anti-collision positioning mechanism. The shielding mechanism includes a fixed frame, an electric push rod, a push column, a push frame fixedly connected to the outer circumferential surface of the second limiting plate, the second limiting plate, a plurality of second arc-shaped grooves formed on the second limiting plate, a plurality of shielding plates, a second limiting column fixedly connected to the lower surface of the shielding plates, a guide block fixedly connected to the upper surface of the shielding plates, a cover plate, and a plurality of guide grooves formed on the cover plate. The fixed frame is fixedly connected to the upper surface of the guide sleeve, the electric push rod is fixedly connected to the lower surface of the fixed frame, the push column is fixedly connected to the output end of the electric push rod, the second limiting plate is rotatably connected inside the fixed frame, the plurality of shielding plates are movably connected inside the fixed frame, and the cover plate is fixedly connected to the upper surface of the fixed frame.

[0010] In a preferred embodiment, the anti-collision positioning mechanism further includes a pressure column, a pressure plate, and a second spring. The pressure column is slidably connected inside the guide sleeve, the pressure plate is fixedly connected to the upper surface of the pressure column, and the second spring is fixedly connected between the pressure plate and the guide sleeve.

[0011] In a preferred embodiment, a second through groove is provided at the corresponding position of the lower mold frame and the guide sleeve, the pressure column is slidably connected in the second through groove, and the pressure plate and the guide column are coaxially arranged.

[0012] In a preferred embodiment, a first through groove is provided on the outer surface of the push frame, a push post is movably connected in the first through groove, a second limiting post is movably connected in the second arc-shaped groove, a guide block is slidably connected in the guide groove, and several baffles together form a complete circumferential surface.

[0013] In a preferred embodiment, the anti-collision positioning mechanism further includes a guide plate, which is fixedly connected to the lower surface of the positioning plate and forms an integrated structure with the positioning plate.

[0014] In a preferred embodiment, the guide plates are connected to the positioning plates in a relatively vertical state at an outward tilting angle, and the three sets of guide plates correspond one-to-one with the three sets of positioning plates, together forming a trumpet-shaped structure.

[0015] In a preferred embodiment, the diameter of the pressure plate is larger than the diameter of the guide post.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention reduces the probability of collision between the guide post and the guide sleeve during the movement of the upper mold frame by using an enlarged aperture design in the anti-collision positioning mechanism. This avoids the problem of sand core falling or being damaged due to collision from the source, reducing sand core loss and production costs. At the same time, in order to ensure positioning accuracy and improve molding quality, the combination design of enlarged guide sleeve aperture anti-collision and multiple sets of anti-collision positioning mechanisms solves the problem of easy collision of traditional small aperture guide sleeves. The coordinated clamping of three positioning plates achieves precise positioning of the guide post, ensuring the mold closing accuracy of the lower mold frame and the upper mold frame, thereby improving the dimensional accuracy of the molded part.

[0018] This invention utilizes a coordinated design of a pressure column, a pressure plate, a second spring, and a blocking mechanism. The blocking mechanism provides gap blocking when the guide column is not completely detached, and achieves full-enclosure blocking when it is completely detached, in conjunction with the pressure plate. This adapts to the entire process of mold opening and demolding, overcoming the shortcomings of traditional flip-type blocking mechanisms that are only suitable for a single working condition. It also prevents internal components of the anti-collision positioning mechanism from jamming and affecting positioning accuracy, ensuring long-term stable operation of the equipment.

[0019] The diameter of the pressure plate in this invention needs to be larger than the diameter of the guide post. The three sets of guide plates are arranged in a trumpet shape. After the inclined inner wall of the guide plate contacts the pressure plate first, it will generate a downward thrust component, which will push the pressure plate to move further down along the second through groove. During this process, the second spring is further slightly compressed to provide travel space for the downward movement of the pressure plate. When the positioning plate moves to the preset position and completes the precise clamping and positioning of the guide post, the guide plate simultaneously pushes the pressure plate down to the position where it is completely separated from the lower end face of the guide post. At this time, the guide post and the pressure plate no longer contact each other, eliminating the friction between them, avoiding wear during the positioning and movement of the guide post, and also protecting the surface structure of the pressure plate. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the hydraulic valve body casting equipment with mold closing and limiting function according to the present invention.

[0021] Figure 2 This is a rear view structural diagram of the hydraulic valve body casting equipment with mold closing and limiting function according to the present invention.

[0022] Figure 3 This is a schematic cross-sectional view of the right side of the hydraulic valve body casting equipment with mold closing and limiting function of the present invention.

[0023] Figure 4 This is a schematic diagram of the external structure of a single anti-collision positioning mechanism and a shielding mechanism of a hydraulic valve body casting equipment with mold closing limitation function according to the present invention.

[0024] Figure 5 This is a schematic diagram of the unfolded structure of a single anti-collision positioning mechanism in the hydraulic valve body casting equipment with mold closing limitation function of the present invention.

[0025] Figure 6 This is a top view of a single anti-collision positioning mechanism of the hydraulic valve body casting equipment with mold closing limitation function according to the present invention.

[0026] Figure 7 The present invention relates to a hydraulic valve body casting equipment with mold closing limitation function. Figure 3 Enlarged structural diagram at point A in the middle.

[0027] Figure 8 The present invention relates to a hydraulic valve body casting equipment with mold closing limitation function. Figure 7 Enlarged structural diagram at point B.

[0028] Figure 9 This is a schematic diagram of the shielding mechanism of the hydraulic valve body casting equipment with mold closing limitation function according to the present invention.

[0029] Figure 10 This is a bottom view of the shielding mechanism of the hydraulic valve body casting equipment with mold closing limitation function according to the present invention.

[0030] Figure 11 The present invention relates to a hydraulic valve body casting equipment with mold closing limitation function. Figure 10 Enlarged structural diagram at point C.

[0031] The attached diagram is labeled as follows: 1. Lower mold frame; 2. Upper mold frame; 3. Hanging beam; 4. Guide post; 5. Anti-collision positioning mechanism; 6. Blocking mechanism; 7. Sand core; 8. Casting gate; 51. Guide sleeve; 511. Mounting frame; 52. Servo motor; 521. First gear; 522. Second gear; 523. First limiting plate; 5231. First arc groove; 524. First limiting post; 525. First slider; 526. Second... 527. Slider; 5271. Positioning plate; 5272. Guide plate; 528. Sliding column; 529. First spring; 53. Pressure column; 54. Pressure plate; 55. Second spring; 61. Fixed frame; 62. Electric push rod; 63. Push column; 64. Push frame; 65. Second limiting plate; 651. Second arc groove; 66. Baffle plate; 661. Second limiting column; 662. Guide block; 67. Cover plate; 671. Guide groove. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Refer to the instruction manual appendix Figures 1-11This invention aims to address the challenges of traditional mold-closing and positioning structures where guide sleeves and guide pillars employ a strict small-diameter fit design to ensure mold-closing accuracy. However, this design demands extremely high alignment precision between the two components. Furthermore, the upper mold frame is typically lifted and lowered by a gantry frame coupled with an iron chain. The flexibility of the iron chain can easily lead to guide pillar displacement due to uneven force distribution and mechanical vibration, resulting in collisions between the guide pillars and guide sleeves. Additionally, the guide sleeves and lower mold frame are rigidly connected without a buffer structure, allowing the impact force generated by the collision to be directly transmitted to the sand core within the mold cavity, causing damage to the sand core and sand material to fall off. Ultimately, this affects the continuity of casting operations and the product qualification rate. This invention provides a hydraulic valve body casting equipment with a mold-closing limitation function, comprising a lower mold frame 1, an upper mold frame 2, a hanging beam 3, a guide pillar 4, and a sand core 7. The upper mold frame 2 is positioned above the lower mold frame 1. The hanging beam 3 is fixedly connected to both sides of the lower mold frame 1 and the upper mold frame 2. The guide pillar 4 is fixedly connected to the lower surface of the upper mold frame 2. The sand core 7 is positioned within the mold cavities of the lower mold frame 1 and the upper mold frame 2.

[0034] It also includes an anti-collision positioning mechanism 5 disposed on the lower mold frame 1. The anti-collision positioning mechanism 5 includes a guide sleeve 51, a mounting frame 511, a first limiting plate 523, a first arc-shaped groove 5231 formed on the upper surface of the first limiting plate 523, a first limiting post 524, a first slider 525, a second slider 526, and a positioning plate 527. The guide sleeve 51 is fixedly connected to the lower mold frame 1, and the mounting frame 511 is fixedly connected to the guide sleeve 51. The first limiting plate 523 is rotatably mounted in the mounting frame 511. The first limiting post 524 is movably mounted in the first arc-shaped groove 5231. The first slider 525 is slidably mounted in the mounting frame 511 and fixedly connected to the first limiting post 524. The second slider 526 is slidably mounted on the first slider 525, and the positioning plate 527 is fixedly mounted on the second slider 526.

[0035] Specifically, the upper mold frame 2 is positioned directly above the lower mold frame 1; two sets of hanging beams 3 are provided, four in each set, evenly distributed around the lower mold frame 1 and the upper mold frame 2; the guide post 4 is fixedly connected to the lower surface of the upper mold frame 2 and moves synchronously with the upper mold frame 2.

[0036] It should be further explained that the upper mold frame 2 is moved by a gantry frame and a chain drive, and finally closes with the lower mold frame 1. The mold closing and positioning are achieved by the cooperation of the guide post 4 and the corresponding guide structure, so as to ensure the molding accuracy of the sand core 7.

[0037] Specifically, the anti-collision positioning mechanism 5 is a core component designed to address the issue of high precision in the fit between the guide post 4 and the guide sleeve 51, where slight shaking of the gantry chain can easily cause them to collide, resulting in the sand core 7 falling off and being damaged. Four sets of these mechanisms are evenly distributed around the lower mold frame 1, corresponding one-to-one with the guide posts 4 on the lower surface of the upper mold frame 2. Furthermore, the anti-collision positioning mechanism 5 achieves the positioning of the guide post 4 and the guide sleeve 51 by enlarging the diameter of the guide sleeve 51 to prevent collisions and by using a multi-component collaborative positioning design for high precision.

[0038] It should be further explained that the guide sleeve 51 is fixedly connected to the upper surface of the lower mold frame 1. The guide sleeve 51 has a hole inside. When the guide post 4 descends, it extends into the hole. The diameter of the hole is larger than the diameter of the guide post 4. In this embodiment, preferably, the diameter of the hole is about twice the diameter of the guide post 4. The mounting frame 511 is fixedly connected to the outer ring of the guide sleeve 51 and serves as the mounting carrier for other functional components of the anti-collision positioning mechanism 5. The enlarged hole design of the guide sleeve 51 can reduce the probability of collision between the guide post 4 and the guide sleeve 51 during the movement of the upper mold frame 2, thus preventing damage to the sand core 7 from the source.

[0039] Furthermore, to provide a power source for the synchronous movement of the positioning plate 527, the anti-collision positioning mechanism 5 also includes a servo motor 52, a first gear 521, and a second gear 522. The servo motor 52 is fixedly connected to the lower surface of the mounting frame 511, and its output end extends upward into the interior of the mounting frame 511. The first gear 521 and the second gear 522 are both rotatably connected inside the mounting frame 511, wherein the axis of the first gear 521 is fixedly connected to the output end of the servo motor 52, and the first gear 521 and the second gear 522 mesh with each other. The second gear 522 is coaxially fixed with the first limiting plate 523. When the servo motor 52 is started, it drives the first gear 521 to rotate. Through gear meshing, it drives the second gear 522 to rotate, which in turn drives the first limiting plate 523 to rotate synchronously. Finally, it drives the three sets of positioning plates 527 to move together to achieve positioning and clamping of the guide post 4. At the same time, the driving action is precisely matched with the downward positioning process of the guide post 4. The positioning is completed before the upper mold frame 2 and the lower mold frame 1 are completely closed, so as to avoid the positioning parts being difficult to move due to excessive weight after mold closing.

[0040] Furthermore, to achieve precise positioning of the guide post 4, the first limiting plate 523 is rotatably mounted within the mounting frame 511 via the second gear 522. Its upper surface has three evenly distributed circumferentially distributed first arc-shaped grooves 5231, such as... Figure 5 As shown, three first limiting posts 524 are correspondingly provided, all movably installed within the first arc-shaped groove 5231; three first sliders 525 are also provided, each with a positioning plate 527. A limiting groove is also provided inside the guide sleeve 51, located above the first slider 525, with the upper end of the first slider 525 extending into the limiting groove and forming a sliding guide engagement with it. This can be understood as the upper end of the first slider 525 having a protrusion located within the limiting groove. The first slider 525 forms a sliding guide engagement with the limiting groove through the protrusion. The groove direction of the limiting groove is consistent with the radial direction of the hole. The first arc-shaped groove 5231 is inclinedly opened on the first limiting plate 523, meaning the two ends of the first arc-shaped groove 5231 are at different distances from the central axis of the hole. For example... Figure 6As shown, the distance between the end of the first arc-shaped groove 5231 away from the central axis of the hole and the central axis of the hole is greater than the distance between the other end (the end of the first arc-shaped groove 5231 closer to the central axis of the hole) and the central axis of the hole. In the initial stage, that is, before the guide post 4 has been inserted into the hole, the first limiting post 524 at the lower end of the first slider 525 is located at the end of the first arc-shaped groove 5231 away from the central axis of the hole, and the upper end of the first slider 525 is located at the end of the limiting groove away from the central axis of the hole. When the lower mold frame 1 and the upper mold frame 2 are closed, that is, when the guide post 4 is fully inserted into the hole, the first limiting post 524 at the lower end of the first slider 525 is located at the end of the first arc-shaped groove 5231 closer to the central axis of the hole. At one end, the upper end of the first slider 525 is located at the end of the limiting groove near the central axis of the hole. The three positioning plates 527 surround to form a positioning cavity that is compatible with the guide post 4, thereby converting the rotational power of the servo motor 52 into the linear clamping power of the positioning plate 527, achieving precise positioning of the guide post 4. When the first limiting plate 523 rotates, the first arc-shaped groove 5231 on its surface drives the first slider 525 to slide radially within the mounting frame 511 through the first limiting post 524, and then drives the three positioning plates 527 to move towards the center synchronously through the second slider 526, completing the clamping and positioning of the guide post 4 in the guide sleeve 51, making up for the problem of insufficient positioning accuracy after the diameter of the guide sleeve 51 is enlarged.

[0041] To prevent the lower mold frame 1 and upper mold frame 2 from not fully closing while the positioning plate 527 has clamped the guide post 4, the anti-collision positioning mechanism 5 also includes a sliding post 528 and a first spring 529. Three sliding posts 528 and three first springs 529 are provided for each set of anti-collision positioning mechanisms 5. The sliding post 528 is fixedly connected to the first slider 525, and the second slider 526 is slidably mounted on the sliding post 528. The second slider 526 is slidably connected to the first slider 525 via the sliding post 528, and the sliding post 528 is vertically... The second slider 526 slides along the axial direction of the slide post 528. The first spring 529 is fixedly connected between the second slider 526 and the first slider 525, and the first spring 529 is sleeved on the outside of the slide post 528. When the guide post 4 does not extend into the guide sleeve 51, the first spring 529 is in its natural state, thereby providing guidance, limiting and buffering compensation for the positioning plate 527, ensuring smooth mold closing action. The design of the slide post 528 can limit the sliding direction of the second slider 526 and prevent the positioning plate 527 from shifting and causing positioning failure.

[0042] Therefore, in actual use, during mold closing, the gantry frame is connected to the upper mold frame 2 via a chain, driving the upper mold frame 2 downwards, gradually approaching the lower mold frame 1. During this process, the guide post 4 moves downwards synchronously with the upper mold frame 2, approaching the corresponding guide sleeve 51. Since the diameter of the guide sleeve 51 is designed to be approximately twice the diameter of the guide post 4, the enlarged aperture allows the guide post 4 to easily extend into the guide sleeve 51, reducing the probability of collision between the guide post 4 and the guide sleeve 51 caused by slight shaking of the gantry frame chain during the movement of the upper mold frame 2. This prevents the sand core 7 from falling or being damaged due to collision. When the guide post 4 initially enters the guide sleeve 51, and before the lower mold frame 1 and the upper mold frame 2 are fully closed, the servo motor 52 is activated. The output of the servo motor 52 drives the first... Gear 521 rotates, driving the second gear 522 to rotate via gear meshing. This, in turn, drives the first limiting disk 523, which meshes with the second gear 522, to rotate synchronously. The rotation of the first limiting disk 523 causes the first limiting post 524 to slide within the first arc-shaped groove 5231, i.e., the first limiting post 524 slides from one end of the first arc-shaped groove 5231 away from the central axis of the hole to the other end. The first limiting post 524 gradually approaches the central axis of the hole. Simultaneously, the upper end of the first slider 525 slides within the limiting groove, i.e., the upper end of the first slider 525 slides from one end of the limiting groove away from the central axis of the hole to the other end. That is, the first slider 525 slides radially along the limiting groove and gradually approaches the central axis of the hole. The radial movement of the first slider 525 drives the second sliding post 524 to rotate. Block 526 moves synchronously, and the radial movement of the second slider 526 drives the positioning plate 527 to move synchronously. That is, the three sets of positioning plates 527 move synchronously towards the side closer to the central axis of the hole. During the movement, the positioning plate 527 pushes the guide post 4 to the center position of the guide sleeve 51. At this time, the central axis of the guide post 4 is collinear with the central axis of the guide sleeve 51, thereby achieving the correction of the guide post 4. When all four sets of guide posts 4 are located in the center position inside the guide sleeve 51, the upper mold frame 2 is located directly above the lower mold frame 1. When the upper mold frame 2 descends, it can completely cover the lower mold frame 1, thus forming a precise mold closing between the upper mold frame 2 and the lower mold frame 1. This makes up for the problem of insufficient positioning accuracy after the diameter of the guide sleeve 51 is enlarged. After the positioning plate 527 clamps the guide post 4, the upper mold frame 2 continues to descend. The mold is moved until it is fully closed with the lower mold frame 1. During this process, if the positioning plate 527 has clamped the guide post 4, but the upper mold frame 2 and the lower mold frame 1 are not fully closed, this is because the positioning plate 527, driven by the first slider 525 and the second slider 526, abuts against and adheres to the surface of the guide post 4. The side of the positioning plate 527 facing away from the second slider 526 is arc-shaped, and the positioning plate 527 is in contact with the guide post 4, resulting in a large frictional force between them. The second slider 526 is fitted onto the sliding post 528, that is, the second slider 526 has a guide hole inside, and one end of the sliding post 528 extends into the guide hole. When the positioning plate 527 abuts against the guide post 4, the second slider 526 also abuts against the sliding post 528. Since the diameter of the guide hole is larger than the diameter of the sliding post 528,Therefore, the wall of the guide hole is in line contact with the sliding post 528, that is, the second slider 526 is in line contact with the sliding post 528. The friction between the second slider 526 and the sliding post 528 is small. Therefore, under the difference in the magnitude of the friction, when the positioning plate 527 clamps the guide post 4, the descent of the guide post 4 causes the positioning plate 527 to descend synchronously. The descent of the positioning plate 527 causes the second slider 526 to slide down on the sliding post 528. At the same time, the first spring 529 begins to contract, and the elastic expansion and contraction of the first spring 529 provides subsequent... The mold closing action provides a certain buffer stroke, and even though the positioning plate 527 clamps the guide post 4, the guide post 4 can still descend within the hole, avoiding excessive clamping of the positioning plate 527 that would obstruct the mold closing action, thus ensuring the smooth completion of the mold closing process. After the lower mold frame 1 and the upper mold frame 2 are fully closed and positioned, the molding material is poured into the mold cavity through the casting port 8 opened on the side sand core 7 of the upper mold frame 2. The molding material gradually cools and solidifies under the constraint of the sand core 7. After the molded part has cooled, the upper mold frame 2 is moved upward by the gantry frame. Simultaneously, the servo motor 52 reverses, driving the first limit plate 523 to rotate in the opposite direction. This, in turn, drives the positioning plate 527 to open outwards synchronously through the aforementioned components, releasing the clamping and positioning of the guide post 4. The upper mold frame 2 continues to move upwards until the guide post 4 is completely detached from the guide sleeve 51. Finally, the molded part and sand core 7 are removed, completing one molding operation. In this embodiment, the guide sleeve 51 in the anti-collision positioning mechanism 5 adopts an enlarged aperture design, reducing the probability of collision between the guide post 4 and the guide sleeve 51 during the movement of the upper mold frame 2. This prevents the sand core 7 from falling or being damaged due to collisions, reducing sand core 7 wear and production costs. Simultaneously, to ensure positioning accuracy and improve molding quality, the combination design of enlarged guide sleeve 51 aperture anti-collision and multiple sets of anti-collision positioning mechanisms 5 for coordinated positioning solves the problem of easy collision with traditional small-aperture guide sleeves 51. Furthermore, the coordinated clamping of the three positioning plates 527 achieves precise positioning of the guide post 4, ensuring the mold closing accuracy of the lower mold frame 1 and the upper mold frame 2, thereby improving the dimensional accuracy of the molded part.

[0043] The existing sand core 7 is the core molding component for hydraulic valve body casting. It is mainly made of sand and binder, and has low inherent strength. During the casting process, the sand core 7 is subjected to high temperature environment for a long time, which easily causes the binder to soften and decompose, resulting in a decrease in the overall structural stability and an increase in looseness of the sand core 7. In the existing mold opening process, due to the contact resistance between the upper mold frame 2, lower mold frame 1 and the sand core 7 and the molded part, it is necessary to use tools such as hammers to violently strike them. The instantaneous impact force generated by the hammering directly acts on the mold frame and the sand core 7, further damaging them. The already loose structure of the sand core 7 eventually leads to the sand material falling off or even the entire sand core 7 falling out, creating a potential hazard. In the traditional mold closing and positioning structure, the guide sleeve 51 and the guide post 4 adopt a small-diameter design with a near-interference fit. Although this can ensure positioning accuracy, it requires extremely high alignment accuracy between the two. During the driving process of the upper mold frame 2, it is very easy for them to collide due to slight misalignment, thereby damaging the sand core 7. To solve this collision problem, an optimized solution is adopted to enlarge the diameter of the guide sleeve 51. By increasing the fit clearance, the probability of collision is reduced. However, this optimization solution has obvious side effects. After the diameter of the guide sleeve 51 is enlarged, its upper opening area increases significantly, making it easier and more likely for fallen sand to enter the guide sleeve 51. Furthermore, the interior of the guide sleeve 51 is the movement space for positioning components; if the sand core 7 falls in, it can easily cause the anti-collision positioning mechanism 5 to jam and wear, while also compromising the fit accuracy between the guide post 4 and the guide sleeve 51, affecting subsequent mold closing and positioning. Moreover, existing shielding solutions for the guide sleeve 51 use a drive structure to rotate and close the cover; its working logic dictates that it can only be used when the guide sleeve 51 is unobstructed. When post 4 is not completely detached from guide sleeve 51, post 4 itself occupies the core area of ​​the upper opening of guide sleeve 51, forming a physical obstruction, preventing the flap from rotating and closing, thus failing to provide adequate protection. Furthermore, the risk of sand core 7 falling off already exists during the initial mold opening stage when post 4 is not completely detached. This lack of protection at this stage leaves the enlarged guide sleeve 51 completely exposed to the risk of falling sand core 7. Existing solutions only cover the later stage when post 4 is completely detached from the mold, failing to provide full-process protection, resulting in incomplete protection. Therefore, to solve the above problems, refer to the appendix... Figures 9-11In this embodiment, a shielding mechanism 6 is also provided on the anti-collision positioning mechanism 5. The shielding mechanism 6 includes a fixed frame 61, an electric push rod 62, a push column 63, a push frame 64 fixedly connected to the outer circumferential surface of the second limiting plate 65, the second limiting plate 65, a plurality of second arc-shaped grooves 651 formed on the second limiting plate 65, a plurality of shielding plates 66, a second limiting column 661 fixedly connected to the lower surface of the shielding plate 66, a guide block 662 fixedly connected to the upper surface of the shielding plate 66, a cover plate 67, and a plurality of guide grooves 671 formed on the cover plate 67. The fixed frame 61 is fixedly connected to the upper surface of the guide sleeve 51, the electric push rod 62 is fixedly connected to the lower surface of the fixed frame 61, the push column 63 is fixedly connected to the output end of the electric push rod 62, the second limiting plate 65 is rotatably connected to the fixed frame 61, the plurality of shielding plates 66 are movably connected to the fixed frame 61, and the cover plate 67 is fixedly connected to the upper surface of the fixed frame 61.

[0044] The anti-collision positioning mechanism 5 also includes a pressure column 53, a pressure plate 54, and a second spring 55. The pressure column 53 is slidably connected inside the guide sleeve 51, the pressure plate 54 is fixedly connected to the upper surface of the pressure column 53, and the second spring 55 is fixedly connected between the pressure plate 54 and the guide sleeve 51.

[0045] Specifically, a second through groove is provided at the corresponding position of the lower mold frame 1 and the guide sleeve 51, the pressure column 53 is slidably connected in the second through groove, and the pressure plate 54 and the guide column 4 are coaxially arranged.

[0046] The outer surface of the push frame 64 has a first through groove, the push post 63 is movably connected in the first through groove, the second limiting post 661 is movably connected in the second arc-shaped groove 651, the guide block 662 is slidably connected in the guide groove 671, and several baffles 66 together form a complete circumferential surface, and one side of several baffles 66 is in contact with the circumferential surface of the guide post 4. At the same time, when the guide post 4 is not inserted, the pressure plate 54, under the elastic force of the second spring 55, makes its upper surface in contact with the lower surface of several baffles 66, so that they form a complete baffle surface.

[0047] It should be further explained that the second spring 55 is fixedly connected between the pressure plate 54 and the guide sleeve 51, and is in a natural extension and contraction state. It provides elastic driving force for the reset of the pressure plate 54. When the guide post 4 is inserted into the guide sleeve 51, it will push the pressure plate 54 downward, causing the pressure post 53 to move down along the second through groove. At the same time, it will compress the second spring 55, providing sufficient space for the insertion of the guide post 4 and avoiding interference between the pressure plate 54 and the positioning of the guide post 4. When the guide post 4 is not inserted into the guide sleeve 51, the elastic rebound force of the second spring 55 will push the pressure plate 54 upward to reset until the upper surface of the pressure plate 54 is tightly attached to the lower surface of several baffle plates 66 in the baffle mechanism 6, forming a complete baffle surface together with the baffle plates 66. The baffle plates 66 at the upper end cooperate from the lower end of the guide sleeve 51 to prevent the sand core 7 from falling into the interior of the guide sleeve 51.

[0048] The fixed frame 61 serves as the mounting carrier for all functional components of the blocking mechanism 6, providing a stable mounting reference for each component. The electric push rod 62 constitutes the power source of the blocking mechanism 6. The push column 63 can convert the linear extension and retraction power of the electric push rod 62 into the rotational driving force of the push frame 64. The push frame 64 and the second limiting plate 65 rotate synchronously. The surface of the second limiting plate 65 is provided with several second arc-shaped grooves 651, such as... Figure 10 As shown, as the core component of power transmission, several baffles 66 together form an openable and closable complete circumferential surface. Several guide grooves 671 opened on the lower surface of the cover plate 67 correspond one-to-one with the baffles 66. Through sliding cooperation with the guide block 662, they provide guidance and limit for the baffles 66.

[0049] Furthermore, the action of the shielding mechanism 6 is triggered when the mold opening action is started. At this time, the electric push rod 62 drives the push column 63 to drive the push frame 64 and the second limit plate 65 to rotate. Through the cooperation of the second arc groove 651 and the second limit column 661, several shielding plates 66 move radially and fit against the circumference of the guide column 4, forming an annular shield at the gap between the guide column 4 and the guide sleeve 51, so as to prevent the high temperature and loose sand core 7 from falling into the guide sleeve 51 when the mold is opened.

[0050] After the guide post 4 is completely disengaged from the guide sleeve 51, the pressure plate 54 moves upward under the action of the second spring 55 until it fits against the lower surface of the baffle plate 66, thus achieving full enclosure of the upper and lower ends of the guide sleeve 51, further preventing the sand core 7 from entering the interior of the guide sleeve 51 and affecting the operation and positioning of the components.

[0051] During use, after the upper mold frame 2 and lower mold frame 1 are fully closed and positioned, the molding material is poured into the mold cavity through the casting port 8 opened on the side sand core 7 of the upper mold frame 2. The molding material gradually cools and solidifies under the constraint of the sand core 7. During this process, the anti-collision positioning mechanism 5 maintains its positioning state, and the shielding mechanism 6 is on standby, jointly ensuring the stability of mold closing and the cleanliness of the inside of the guide sleeve 51, providing support for molding accuracy. During the mold opening and demolding stages, when the guide post 4 has not completely detached from the guide sleeve 51, the molded part is cooled and the mold opening stage is started. At this time, the guide post 4 is still inside the guide sleeve 51 and has not completely detached. The electric push rod 62 of the shielding mechanism 6 is triggered, driving the push post 63 to extend and retract. Since the push post 63 is movably connected to The first through groove of the push frame 64 drives the push frame 64 and the fixedly connected second limiting plate 65 to rotate synchronously. The second limiting plate 65 cooperates with the second limiting post 661 on the lower surface of the baffle plate 66 through the second arc groove 651 on the plate surface, converting the rotational power into the radial movement of the baffle plate 66. At the same time, the guide block 662 on the upper surface of the baffle plate 66 slides along the guide groove 671 of the cover plate 67 to ensure accurate movement direction. Finally, several baffle plates 66 move towards the center synchronously, and their inner sidewalls are tightly fitted with the circumference of the guide post 4, forming an annular baffle at the gap between the guide post 4 and the enlarged diameter guide sleeve 51, blocking the sand core 7 that falls loose due to high temperature and hammering operation during mold opening, and preventing the sand core 7 from entering the gap of the guide sleeve 51.

[0052] When the guide post 4 is completely disengaged from the fully enclosed shield, i.e., during demolding, the gantry frame drives the upper mold frame 2 to move upward, causing the guide post 4 to gradually disengage from the guide sleeve 51. The servo motor 52 of the anti-collision positioning mechanism 5 reverses, driving the positioning plate 527 to open outward, releasing the clamping of the guide post 4. When the guide post 4 is completely disengaged from the guide sleeve 51, the elastic rebound force of the second spring 55 pushes the pressure plate 54 to move upward and reset until the upper surface of the pressure plate 54 is tightly attached to the lower surface of the shielding plate 66, forming a complete annular shielding surface. At this time, the upper end of the guide sleeve 51 is closed by the shielding plate 66 and the pressure plate 54, achieving a fully enclosed shielding. To further prevent residual sand core 7 from falling into the guide sleeve 51 and affecting the operation and positioning accuracy of the subsequent anti-collision positioning mechanism 5, in this embodiment, through the coordinated design of the pressure column 53, pressure plate 54, second spring 55 and shielding mechanism 6, the shielding mechanism 6 achieves gap shielding when the guide column 4 is not completely detached, and achieves full-enclosure shielding in cooperation with the pressure plate 54 after complete detachment. It is suitable for the entire process of mold opening and demolding, and solves the defect that the traditional flip-type shielding is only suitable for a single working condition. It avoids the jamming of internal components of the anti-collision positioning mechanism 5 and the impact on positioning accuracy, and ensures the long-term stable operation of the equipment.

[0053] In the structure of the anti-collision positioning mechanism 5, which adds a pressure column 53, a pressure plate 54, and a second spring 55, when the guide column 4 is fully inserted into the guide sleeve 51, it will simultaneously push the pressure plate 54 downward. At this time, the second spring 55 is fully compressed. Due to the large compression deformation of the second spring 55, the generated compressive force is significantly increased, causing the pressure plate 54 to fit tightly against the lower end face of the guide column 4. This tight fit will cause a large friction between the guide column 4 and the pressure plate 54 during the positioning movement. Under long-term operation, this can easily cause damage to the lower end face of the guide column 4 and the upper surface of the pressure plate 54. Wear not only reduces the service life of components, but also may affect the internal environment of the guide sleeve 51 due to impurities generated by wear, thereby interfering with the subsequent positioning accuracy. In order to solve the problem of high friction and wear caused by the tight fit between the guide post 4 and the pressure plate 54, in this embodiment, the anti-collision positioning mechanism 5 also includes a guide plate 5271. The guide plate 5271 is fixedly connected to the lower surface of the positioning plate 527 and forms an integrated structure with the positioning plate 527. It moves synchronously with the positioning plate 527, without the need for additional drive components, simplifying the structure while ensuring the coordination of actions.

[0054] Specifically, the guide plate 5271 is connected to the positioning plate 527, which is in a vertical state, at an outward angle. The three sets of guide plates 5271 correspond one-to-one with the three sets of positioning plates 527, forming a trumpet-shaped structure that precisely corresponds to the position of the pressure plate 54 below. The diameter of the pressure plate 54 must be larger than the diameter of the guide post 4 to ensure that the guide plate 5271 can accurately contact the edge area of ​​the pressure plate 54 during movement. At the same time, the tilt angle and length of the guide plate 5271 must be adapted to the diameter of the pressure plate 54 and the moving stroke of the positioning plate 527 to ensure that the guide plate 5271 can smoothly push the pressure plate 54 down to the position where it is separated from the guide post 4.

[0055] It should be further explained that the guide plate 5271, through its coordinated action with the positioning plate 527, pushes the pressure plate 54 and the guide post 4 to separate, reducing the friction between them and preventing component wear. Its specific action logic is synchronized with the positioning action of the positioning plate 527. When the guide post 4 is fully inserted into the guide sleeve 51, it pushes the pressure plate 54 down to the height position corresponding to the guide plate 5271. At this time, the second spring 55 is in a fully compressed state, and the pressure plate 54 tightly adheres to the lower end face of the guide post 4. Subsequently, the anti-collision positioning mechanism 5 initiates its positioning action, and the three sets of positioning plates 527 move synchronously towards the center. Since the guide plate 5271 is fixed to the lower surface of the positioning plate 527, the guide plate 5271... 271 moves towards the center synchronously with the positioning plate 527. During this movement, the guide plate 5271 contacts the edge of the pressure plate 54 before the positioning plate 527. The positioning plate 527 continues to move towards the center, driving the guide plate 5271 to continue to advance inward. Since the three sets of guide plates 5271 form a funnel shape, their inclined inner walls will generate a downward thrust component after contacting the pressure plate 54, pushing the pressure plate 54 further downward along the second through groove. During this process, the second spring 55 is further slightly compressed, providing travel space for the downward movement of the pressure plate 54. Before the positioning plate 527 moves to the preset position and completes the precise clamping and positioning of the guide post 4, the guide plate 5271 pushes synchronously. The moving pressure plate 54 moves down to a position completely detached from the lower end face of the guide post 4. At this point, the guide post 4 and the pressure plate 54 are no longer in contact, eliminating the friction between them and preventing wear during the positioning and movement of the guide post 4. This also protects the surface structure of the pressure plate 54. When the mold opening and demolding stage is initiated, and the positioning plate 527 moves outward to release the positioning of the guide post 4, the guide plate 5271 moves outward synchronously with the positioning plate 527. The downward pushing force on the pressure plate 54 disappears. At this time, the pressure plate 54 moves upward to reset under the elastic rebound force of the second spring 55, waiting for the next insertion of the guide post 4. In this embodiment, the diameter of the pressure plate 54 must be larger than the diameter of the guide post 4. The three sets of guide plates 5271 are arranged in a trumpet shape. Their inclined inner walls first contact the pressure plate 54 and generate a downward thrust component, pushing the pressure plate 54 to move further down along the second through groove. During this process, the second spring 55 is further slightly compressed to provide travel space for the downward movement of the pressure plate 54. When the positioning plate 527 moves to the preset position and completes the precise clamping and positioning of the guide post 4, the guide plate 5271 simultaneously pushes the pressure plate 54 down to the position where it is completely separated from the lower end face of the guide post 4. At this time, the guide post 4 and the pressure plate 54 no longer contact each other, eliminating the friction between them and avoiding wear during the positioning and movement of the guide post 4. At the same time, it also protects the surface structure of the pressure plate 54.

[0056] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. Hydraulic valve body casting equipment with mold closing limiting function, comprising a lower mold frame (1), an upper mold frame (2), a hanging beam (3), a guide column (4), a sand core (7), the upper mold frame (2) is arranged above the lower mold frame (1), the hanging beam (3) is fixedly connected on both sides of the lower mold frame (1) and the upper mold frame (2) respectively, the guide column (4) is fixedly connected to the lower surface of the upper mold frame (2), and the sand core (7) is arranged in the mold cavity of the lower mold frame (1) and the upper mold frame (2). characterized in that It also includes an anti-collision positioning mechanism (5) arranged on the lower mold frame (1), the anti-collision positioning mechanism (5) comprises a guide sleeve (51), a mounting frame (511), a first limiting disc (523), a first arc-shaped groove (5231) opened on the upper surface of the first limiting disc (523), a first limiting column (524), a first sliding block (525), a second sliding block (526), a positioning plate (527), the guide sleeve (51) is fixedly connected on the lower mold frame (1), the mounting frame (511) is fixedly connected on the guide sleeve (51), the first limiting disc (523) is rotatably driven and installed in the mounting frame (511), the first limiting column (524) is movably installed in the first arc-shaped groove (5231), the first sliding block (525) is slidably installed in the mounting frame (511) and is fixedly connected with the first limiting column (524), the second sliding block (526) is slidably installed on the first sliding block (525), and the positioning plate (527) is fixedly installed on the second sliding block (526).

2. The hydraulic valve body casting apparatus having a mold closing function according to claim 1, wherein The anti-collision positioning mechanism (5) further comprises a servo motor (52), a first gear (521) and a second gear (522), the servo motor (52) is fixedly connected on the lower surface of the mounting frame (511), the output end extends upward to the inside of the mounting frame (511), the first gear (521) and the second gear (522) are rotatably connected in the mounting frame (511), wherein the shaft of the first gear (521) is fixedly connected with the output end of the servo motor (52), the first gear (521) and the second gear (522) are meshed with each other, and the second gear (522) is coaxially fixed with the first limiting disc (523).

3. The hydraulic valve body casting apparatus with mold closing function according to claim 2, wherein The anti-collision positioning mechanism (5) further comprises a slide column (528) and a first spring (529), the slide column (528) and the first spring (529) are provided with three corresponding ones, the slide column (528) is fixedly connected on the first sliding block (525), the second sliding block (526) is slidably sleeved on the slide column (528), and the first spring (529) is fixedly connected between the second sliding block (526) and the first sliding block (525), and the first spring (529) is sleeved outside the slide column (528).

4. The hydraulic valve body casting apparatus with mold closing function according to claim 3, wherein The casting device further comprises a shielding mechanism (6) arranged on the anti-collision positioning mechanism (5), the shielding mechanism (6) comprising a fixed frame (61), an electric push rod (62), a push column (63), a push frame (64) fixedly connected to the outer circumferential surface of a second limiting disc (65), the second limiting disc (65), a plurality of second arc-shaped grooves (651) formed in the second limiting disc (65), a plurality of shielding plates (66), a second limiting column (661) fixedly connected to the lower surface of the shielding plate (66), a guide block (662) fixedly connected to the upper surface of the shielding plate (66), a cover plate (67), a plurality of guide grooves (671) formed in the cover plate (67), the fixed frame (61) being fixedly connected to the upper surface of the guide sleeve (51), the electric push rod (62) being fixedly connected to the lower surface of the fixed frame (61), the push column (63) being fixedly connected to the output end of the electric push rod (62), the second limiting disc (65) being rotatably connected in the fixed frame (61), the plurality of shielding plates (66) being movably connected in the fixed frame (61), and the cover plate (67) being fixedly connected to the upper surface of the fixed frame (61).

5. The hydraulic valve body casting apparatus having a mold closing function according to claim 4, wherein The anti-collision positioning mechanism (5) further comprises a pressing column (53), a pressing disc (54) and a second spring (55), the pressing column (53) being slidably connected in the guide sleeve (51), the pressing disc (54) being fixedly connected to the upper surface of the pressing column (53), and the second spring (55) being fixedly connected between the pressing disc (54) and the guide sleeve (51).

6. The hydraulic valve body casting apparatus with mold closing function according to claim 5, wherein The lower mold frame (1) and the guide sleeve (51) are both provided with a second through groove at the corresponding positions, the pressing column (53) is slidably connected in the second through groove, and the pressing disc (54) is coaxially arranged with the guide column (4).

7. The hydraulic valve body casting apparatus having a mold closing function according to claim 4, wherein The outer surface of the push frame (64) is provided with a first through groove, the push column (63) is movably connected in the first through groove, the second limiting column (661) is movably connected in the second arc-shaped groove (651), the guide block (662) is slidably connected in the guide groove (671), and the plurality of shielding plates (66) jointly form a complete circumferential surface.

8. The hydraulic valve body casting apparatus having a mold closing function according to claim 1, wherein The anti-collision positioning mechanism (5) further comprises a guide plate (5271) fixedly connected to the lower surface of the positioning plate (527) and forming an integrated structure with the positioning plate (527).

9. The hydraulic valve body casting apparatus with mold closing function according to claim 8, wherein The guide plate (5271) is connected at an outwardly inclined angle relative to the positioning plate (527) in a perpendicular state, and the three groups of guide plates (5271) correspond to the three groups of positioning plates (527) one by one to jointly form a horn-shaped structure.

10. The hydraulic valve body casting apparatus with mold closing function according to claim 5, wherein The diameter of the pressing disc (54) is greater than the diameter of the guide column (4).

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