Hot core box moving die scissor type rotating support ejection structure
By using a bracket assembly connected by a cross-rotating bracket and a rotating pin in the hot core box, the weight of the ejector device is distributed, solving the problems of ejector wear and bending, and improving the stability and service life of the ejector.
Patent Information
- Application Number
- CN202520436967.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-13
AI Technical Summary
In the current production of hot core boxes, the ejection device is a cantilever structure, with all the weight acting on the guide reset rod and the ejector rod. This results in severe wear on one side of the guide reset rod and bending of the ejector rod, affecting normal operation.
The hot core box moving mold scissor-type rotating bracket ejection structure is adopted. The first and second rotating brackets are connected to the rotating pin through cross-set first rotating brackets, which distributes the weight of the ejection device, increases the stability of the ejector rod, and wear-resistant bushings are set at the bracket connection to reduce friction.
It effectively reduces the burden on the guide reset rod and the push rod, reduces wear, extends the service life of the ejection device, and improves the stability and service life of the push rod.
Smart Images
Figure CN223819611U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot core box technology, and in particular to a hot core box moving mold scissor-type rotating bracket ejection structure. Background Technology
[0002] Hot core box core making involves preparing core sand using liquid thermosetting resin binder and hardener. This core sand is then injected into a core box heated to a specific temperature using a sand injection method. The sand core close to the core box surface is heated, and the binder condenses and hardens in a very short time. Once a hard shell of a few millimeters forms on the surface of the sand core, it can be removed from the core box. The central part of the sand core hardens itself using residual heat and the heat released from the hardening reaction. Current hot core box production methods use sand cores to form the inner cavity of castings. The mold closing and opening of the hot core box are achieved by the left and right movement of the moving mold. After mold opening, the sand core generally adheres to the cavity of the moving mold. Therefore, a sand core ejection device (ejector rod, guide return rod, ejector plate) must be installed on the moving mold to detach the sand core from the moving mold. Because the ejection device is a cantilever structure, the entire weight of the device is applied to the guide return rod and the ejector rod. Long-term sliding causes severe wear on one side of the guide return rod of the core box, leading to drooping of the tail of the ejection device. This increases the radial resistance of the ejector rod and can also cause it to bend, preventing normal operation. Therefore, this invention proposes a scissor-type rotating bracket ejection structure for the moving mold of a hot core box. Utility Model Content
[0003] The purpose of this invention is to address the issue in the background technology where hot core boxes are used to produce sand cores to form the inner cavity of castings. The mold closing and opening of the hot core box are both achieved by the left and right movement of the moving mold. After the mold is opened, the sand core is generally attached to the mold cavity of the moving mold. The ejection device is a cantilever structure, and the weight of the device is entirely applied to the guide return rod and the ejector rod. Long-term sliding causes severe wear on one side of the guide return rod of the core box, resulting in the tail of the ejection device drooping. This will increase the radial resistance of the ejector rod and cause the ejector rod to bend and fail to operate normally. This invention proposes a scissor-type rotating bracket ejection structure for the moving mold of the hot core box.
[0004] The technical solution of this utility model is as follows: a hot core box moving mold scissor-type rotating bracket ejection structure, comprising: a fixed mold and a moving mold, wherein a sand core is provided between the fixed mold and the moving mold; ejection components are respectively provided on opposite sides of the fixed mold and the moving mold, wherein a bracket component for stable support is provided between the ejection component and the moving mold.
[0005] Optionally, the ejection assembly includes a set of ejector rods passing through the moving mold. One end of each ejector rod passes through the moving mold and extends into the interior. One end of each ejector rod is fixedly connected to an ejector plate. A guide reset rod is fixedly provided on one side of the ejector plate. One end of the guide reset rod passes through the moving mold and extends into the interior, where a reset block is connected.
[0006] Optionally, the bracket assembly includes a first rotating bracket and a second rotating bracket arranged intersecting each other. The first rotating bracket and the second rotating bracket are rotatably connected by a rotating pin. The two ends of the rotating pin are provided with a threaded structure, and the two ends of the rotating pin are threaded with fixing nuts for limiting the first rotating bracket and the second rotating bracket.
[0007] Optionally, the two ends of the first and second rotating brackets are fixedly connected to the moving mold and the ejector plate respectively by fixing screws.
[0008] Optionally, wear-resistant bushings are provided at the connection points between the first and second rotating brackets and the rotating pin.
[0009] Optionally, the two ends of the first and second rotating brackets are respectively configured with an "L" shape.
[0010] Optionally, the fixing nut is a lock nut.
[0011] In summary, this application includes at least one of the following beneficial technical effects:
[0012] This utility model uses a first rotating bracket and a second rotating bracket in a bracket assembly to cross each other and be rotatably connected by a rotating pin. Both ends are fixed to the moving mold and the ejection assembly, respectively. This distributes part of the weight of the ejection device to the bracket assembly, increases the stability of the ejector rod, greatly reduces the burden on the guide reset rod and the ejector rod, effectively reduces the wear on one side caused by long-term sliding, and extends the service life of the ejection device.
[0013] Furthermore, by setting both ends of the first and second rotating brackets to be "L"-shaped structures, this utility model increases the installation area and improves the stability of the support. Wear-resistant bushings are also provided between the first and second rotating brackets and the rotating pin to reduce friction and increase service life. Attached Figure Description
[0014] Figure 1 A schematic diagram of a scissor-type rotating bracket ejection structure for a hot core box moving mold is provided.
[0015] Figure 2 yes Figure 1 A schematic diagram of the moving model in the diagram;
[0016] Figure 3 yes Figure 1 A schematic diagram of the structure of the ejector component;
[0017] Figure 4 yes Figure 1 A schematic diagram of the structure of the support frame assembly.
[0018] Figure label:
[0019] 1. Fixed mold; 2. Moving mold; 3. Sand core;
[0020] 4. Ejector assembly; 41. Ejector rod; 42. Ejector rod plate; 43. Guide reset rod; 44. Reset block;
[0021] 5. Bracket assembly; 51. First rotating bracket; 52. Second rotating bracket; 53. Rotating pin; 54. Fixing nut;
[0022] 6. Fixing screws; 7. Wear-resistant bushings. Detailed Implementation
[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.
[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] Example
[0029] like Figure 1 and Figure 2 As shown, the present invention proposes a hot core box moving mold scissor-type rotating bracket ejection structure, including: a fixed mold 1 and a moving mold 2, wherein a cavity can be formed between the fixed mold 1 and the moving mold 2, and a sand core 3 is provided between the fixed mold 1 and the moving mold 2; ejection components 4 are respectively provided on opposite sides of the fixed mold 1 and the moving mold 2, and a bracket component 5 is provided between the ejection component 4 and the moving mold 2 for stable support, which can ensure that the ejection component 4 moves stably horizontally.
[0030] like Figure 1 and Figure 3 As shown, the ejector assembly 4 includes a set of ejector rods 41 that pass through the moving mold 2. One end of the ejector rod 41 passes through the moving mold 2 and extends into the interior. One end of the ejector rod 41 is fixedly connected to an ejector plate 42. A guide reset rod 43 is fixedly provided on one side of the ejector plate 42. One end of the guide reset rod 43 passes through the moving mold 2 and extends into the interior, where a reset block 44 is connected, which facilitates the stable movement of the moving mold 2.
[0031] like Figure 1 and Figure 4 As shown, the bracket assembly 5 includes a first rotating bracket 51 and a second rotating bracket 52 arranged intersecting each other. Both ends of the first rotating bracket 51 and the second rotating bracket 52 are telescopic rods. Connecting seats are rotatably connected to both ends of the first rotating bracket 51 and the second rotating bracket 52, which can extend during the stretching process to increase the stability of movement. The first rotating bracket 51 and the second rotating bracket 52 are rotatably connected by a rotating pin 53 to ensure the stable rotation of the first rotating bracket 51 and the second rotating bracket 52. Both ends of the rotating pin 53 are provided with a threaded structure, and fixing nuts 54 for limiting the first rotating bracket 51 and the second rotating bracket 52 are threaded to both ends of the rotating pin 53, which can disassemble the first rotating bracket 51 and the second rotating bracket 52 for easy replacement.
[0032] Furthermore, the connecting seats at both ends of the first rotating bracket 51 and the second rotating bracket 52 are fixedly connected to the moving mold 2 and the ejector plate 42 respectively by fixing screws 6, which can stably guide the ejection assembly 4.
[0033] Secondly, wear-resistant bushings 7 are provided at the connection between the first rotating bracket 51 and the second rotating bracket 52 and the rotating pin 53 to reduce the friction between the first rotating bracket 51 and the second rotating bracket 52 and the rotating pin 53, thereby improving the service life.
[0034] Furthermore, the first rotating bracket 51 and the second rotating bracket 52 are respectively designed with "L"-shaped structures at both ends, which facilitates stable connection with the moving mold 2 and the ejector plate 42.
[0035] In addition, the fixing nut 54 is an anti-loosening nut, which increases the stability of the connection between the first rotating bracket 51 and the second rotating bracket 52.
[0036] The working principle of this embodiment is as follows: First, the hot core box enters the mold closing process, with the fixed mold 1 and the moving mold 2 tightly fitted together to form a closed mold cavity. At this time, the core sand is injected into the mold cavity at high speed through the sand injection nozzle. Under specific thermal environment and curing conditions, the sand core gradually solidifies and forms the desired shape of the sand core 3. During this process, the tight fit and stable structure between the fixed mold 1 and the moving mold 2 ensure that the core sand can be uniformly filled and accurately cured within the mold cavity, laying the foundation for the subsequent molding quality of the sand core 3.
[0037] After the sand core 3 has solidified, the hot core box enters the mold opening stage. The moving mold 2 drives the already formed sand core 3 to separate from the fixed mold 1. During this process, the support assembly 5 and the ejection assembly 4 on one side of the moving mold 2 move together with the moving mold 2, preparing for the subsequent ejection operation. The support assembly 5 maintains stable support for the moving mold 2 and the ejection assembly 4 during the mold opening process, ensuring the stability of the moving mold 2 during movement and avoiding the impact of shaking or displacement on the separation effect of the sand core 3 from the fixed mold 1 and the accuracy of the subsequent ejection operation.
[0038] With the complete separation of the moving mold 2 and the fixed mold 1, the ejection operation begins. The first rotating bracket 51 and the second rotating bracket 52 in the support assembly 5 rotate and open around the rotating pin 53. This action changes the structure of the support assembly 5, creating space for the ejector pin 41 to eject. Simultaneously, the ejector pin 41 in the ejection assembly 4, pushed by the ejector plate 42, extends outward from inside the moving mold 2. The ejector pin 41 continues to extend until it contacts the sand core 3, gradually applying thrust, ultimately ejecting the sand core 3 from inside the moving mold 2. During this process, the rotational opening action of the first rotating bracket 51 and the second rotating bracket 52 not only provides sufficient space for the ejector pin 41 to move, but also, through its structural changes, ensures the overall stability of the moving mold 2 and the ejection assembly 4 during ejection, enabling the ejector pin 41 to smoothly and accurately eject the sand core 3.
[0039] After the core 3 is successfully ejected, the hot core box enters the preparation stage for the next work cycle, namely the reset stage. The moving mold 2 and the ejection device begin their mold-closing movement. As the moving mold 2 moves, the first rotating bracket 51 and the second rotating bracket 52 in the support assembly 5 rotate in opposite directions around the rotating pin 53 under the influence of external forces such as the mold-closing movement of the moving mold 2 and the interaction of their own structures, gradually closing to their initial state. At the same time, the guide reset rod 43 in the ejection assembly 4, under the action of the reset block 44, drives the ejector plate 42 and the ejector rod 41 to retract into the moving mold 2 until they return to their initial positions. Throughout the reset process, the rotational closing action of the support assembly 5 and the retraction action of the ejection assembly 4 work together to ensure that all components of the hot core box can be accurately and efficiently reset, making full preparations for the next mold-closing and core-making operation.
[0040] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.
Claims
1. A scissor-type rotating support ejection structure for a hot core box moving mold, characterized in that, include: A fixed mold (1) and a moving mold (2), wherein a sand core (3) is provided between the fixed mold (1) and the moving mold (2); Ejection components (4) are respectively disposed on opposite sides of the fixed mold (1) and the moving mold (2), and a support component (5) is disposed between the ejection component (4) and the moving mold (2) for stable support.
2. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 1, characterized in that, The ejection assembly (4) includes a set of ejector rods (41) that pass through the moving mold (2). One end of the ejector rod (41) passes through the moving mold (2) and extends into the interior. One end of the ejector rod (41) is fixedly connected to an ejector plate (42). A guide reset rod (43) is fixedly provided on one side of the ejector plate (42). One end of the guide reset rod (43) passes through the moving mold (2) and extends into the interior, where a reset block (44) is connected.
3. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 2, characterized in that, The bracket assembly (5) includes a first rotating bracket (51) and a second rotating bracket (52) arranged intersecting each other. The first rotating bracket (51) and the second rotating bracket (52) are rotatably connected by a rotating pin (53). The two ends of the rotating pin (53) are provided with a threaded structure, and the two ends of the rotating pin (53) are threaded with fixing nuts (54) for limiting the first rotating bracket (51) and the second rotating bracket (52).
4. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 3, characterized in that, The first rotating bracket (51) and the second rotating bracket (52) are fixedly connected to the moving mold (2) and the top rod plate (42) respectively by fixing screws (6).
5. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 4, characterized in that, Wear-resistant bushings (7) are provided at the connection between the first rotating bracket (51) and the second rotating bracket (52) and the rotating pin (53).
6. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 4, characterized in that, The first rotating bracket (51) and the second rotating bracket (52) are respectively configured with "L" shaped structures at both ends.
7. The hot core box moving mold scissor-type rotating bracket ejection structure according to claim 4, characterized in that, The fixing nut (54) is a lock nut.