A ventilation and anti-air hole structure for casting molds of mechanical parts

Abstract

This utility model discloses a venting and anti-air hole structure for a casting mold of mechanical parts, relating to the field of casting technology for mechanical parts. It includes a top plate, a mounting plate fixedly mounted on the bottom surface of the top plate, guide posts fixedly mounted on the outer wall of the mounting plate, an upper mold fixedly mounted inside the mounting plate, venting holes formed in the upper mold and the mounting plate, a connecting pipe connected to the outer wall of the mounting plate, a connecting sleeve connected to the bottom end of the connecting pipe, a guide rod slidably mounted inside the connecting sleeve, a sliding rod fixedly mounted at the bottom end of the guide rod, and a sealing plate fixedly mounted at the bottom end of the sliding rod. The top surface of the sealing plate abuts against the bottom surface of the connecting sleeve. In the initial stage of casting, the cooperation between the guide rod and the sealing structure ensures the stability and tightness of the sealing plate in the closed state, effectively preventing external air from entering the mold cavity or molten metal from flowing back, and avoiding porosity defects caused by insufficient pressure in the initial stage of pouring.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts casting technology, and more specifically, it relates to a venting and anti-air hole structure for a mechanical parts casting mold. Background Technology

[0002] During the casting process, timely venting of gas from the mold cavity is crucial to preventing porosity defects in the casting. Traditional venting structures often employ fixed vent holes or simple channels, which are prone to drawing in air during the initial pouring stage due to insufficient molten metal pressure. Furthermore, as the pressure increases, poor venting can lead to gas stagnation, making it difficult to dynamically adjust to changes in mold cavity pressure and thus easily causing porosity problems in the casting.

[0003] To address the shortcomings of traditional exhaust structures, automatic pressure-response exhaust structures have been proposed and applied. However, existing technologies mostly rely on the cooperation of springs and mechanical seals to achieve opening and closing. The spring components are prone to fatigue or elasticity decay in high-temperature environments, potentially leading to delayed response or inadequate sealing. Simultaneously, the mechanical seal surface is susceptible to wear under long-term exposure to high-temperature molten metal and gas, affecting sealing reliability. Furthermore, the overall structure is relatively complex, resulting in high maintenance costs. These factors limit its exhaust efficiency and long-term operational stability, leaving room for improvement in high-quality casting production. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a venting and anti-air hole structure for casting molds of mechanical parts, so as to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a venting and anti-air hole structure for a casting mold of mechanical parts, comprising a top plate, an mounting plate fixedly mounted on the bottom surface of the top plate, a guide post fixedly mounted on the outer wall of the mounting plate, an upper mold fixedly mounted inside the mounting plate, venting holes formed in the upper mold and the mounting plate, a connecting pipe connected to the outer wall of the mounting plate, a connecting sleeve connected to the bottom end of the connecting pipe, a guide rod slidably mounted inside the connecting sleeve, a sliding rod fixedly mounted at the bottom end of the guide rod, a sealing plate fixedly mounted at the bottom end of the sliding rod, and the top surface of the sealing plate abutting against the bottom surface of the connecting sleeve.

[0008] This invention further includes a connecting block fixedly mounted on the top of the guide block, and a tension spring connecting the connecting block and the connecting sleeve to provide a restoring force when the pressure inside the cavity decreases, allowing the sealing plate to automatically return to a sealing state. This invention further includes a polygonal guide rod that is slidably connected to the connecting sleeve to prevent rotation and ensure stability during the sliding process. This invention further includes a sealing ring fixedly mounted on the outer side of the sealing plate, and a sealing groove formed on the bottom surface of the connecting sleeve to create a tight sealing structure and prevent gas leakage. This invention further includes multiple sets of sealing rings and sealing grooves, with multiple sets of sealing rings abutting within the sealing grooves to enhance the sealing effect and improve sealing reliability. This invention further includes a limiting plate fixedly mounted on the inner side of the connecting sleeve, which is slidably connected to the sliding rod to guide and limit the sliding rod, preventing the sealing plate from shifting. The present invention is further configured such that a sealing block is fixedly provided on the outer wall of the sealing plate, and multiple sets of sealing blocks are provided. A sealing hole is provided on the outer wall of the limiting plate, and multiple sets of sealing holes are provided, each slidably connected to multiple sets of sealing blocks, to further guide the sealing plate, prevent its rotation, and ensure smooth movement. The present invention is further configured such that the connecting pipe and the exhaust port are concentrically arranged to ensure unobstructed gas flow path and ensure exhaust efficiency.

[0009] (III) Beneficial Effects

[0010] Compared with the prior art, this utility model provides a venting and anti-air hole structure for casting molds of mechanical parts, which has the following beneficial effects:

[0011] 1. In the early stages of casting, the cooperation between the guide rod and the sealing structure ensures the stability and tightness of the sealing plate in the closed state, effectively preventing outside air from entering the mold cavity or the backflow of molten metal, and avoiding porosity defects caused by insufficient pressure in the early stages of pouring.

[0012] 2. When the pressure inside the cavity increases, the gas pressure pushes the sealing plate to move down automatically and open the channel. The guiding and limiting design ensures that the sealing plate moves smoothly without tilting, allowing the gas to be discharged smoothly, reducing the cavity pressure in time, and preventing gas from stagnating and forming pores.

[0013] 3. After the pressure decreases after venting, the sealing plate automatically resets under the action of the spring to restore the seal, preventing air backflow or blockage of the channel during the solidification process of the molten metal. This automatic adjustment mechanism that changes with pressure improves venting efficiency and sealing reliability, ensuring the stability of casting quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the venting and air-proof hole structure of a casting mold for mechanical parts in this utility model;

[0015] Figure 2 This is a cross-sectional view of the connecting sleeve in this utility model;

[0016] Figure 3 This is a schematic diagram of the sealing plate in this utility model;

[0017] Figure 4 This is a schematic diagram of the sealing groove in this utility model;

[0018] Figure 5 This is a cross-sectional view of the exhaust port in this utility model.

[0019] In the diagram: 1. Top plate; 2. Mounting plate; 3. Guide post; 4. Upper mold; 5. Vent hole; 6. Connecting pipe; 7. Connecting sleeve; 8. Guide rod; 9. Slide rod; 10. Sealing plate; 11. Connecting block; 12. Tension spring; 13. Sealing ring; 14. Sealing groove; 15. Limiting plate; 16. Sealing block; 17. Sealing hole. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0023] Please see Figures 1-5 A ventilation and anti-air hole structure for a casting mold of mechanical parts includes a top plate 1, an mounting plate 2 fixedly mounted on the bottom surface of the top plate 1, a guide post 3 fixedly mounted on the outer wall of the mounting plate 2, an upper mold 4 fixedly mounted inside the mounting plate 2, ventilation holes 5 opened in the upper mold 4 and the mounting plate 2, a connecting pipe 6 connected to the outer wall of the mounting plate 2, a connecting sleeve 7 connected to the bottom end of the connecting pipe 6, a guide rod 8 slidably mounted inside the connecting sleeve 7, a sliding rod 9 fixedly mounted at the bottom end of the guide rod 8, and a sealing plate 10 fixedly mounted at the bottom end of the sliding rod 9, with the top surface of the sealing plate 10 abutting against the bottom surface of the connecting sleeve 7.

[0024] In this embodiment, before the casting operation begins, the tension spring 12 is in its natural state. The guide rod 8 is pulled upwards by the connecting block 11, causing it to slide axially upwards within the connecting sleeve 7. The guide rod 8 employs a polygonal design to engage with the inner wall of the connecting sleeve 7, ensuring stability by preventing rotation during sliding. The guide rod 8 drives the bottom sliding rod 9 and the sealing plate 10 upwards together. The top surface of the sealing plate 10 remains in contact with the bottom surface of the connecting sleeve 7. At this time, the multiple sets of sealing rings 13 fixed to the outer side of the sealing plate 10 are fully inserted into the multiple sets of sealing grooves 14 on the bottom surface of the connecting sleeve 7, forming... The tight sealing structure and the concentric arrangement of the connecting pipe 6 and the exhaust hole 5 in the mounting plate 2 ensure unobstructed gas flow path. Multiple sets of sealing blocks 16 fixed to the outer wall of the sealing plate 10 slide into the corresponding sets of sealing holes 17 on the outer wall of the limiting plate 15. The limiting plate 15 guides and limits the sliding rod 9 to prevent the sealing plate 10 from shifting. The entire exhaust channel is in a closed standby state. When the molten metal has not yet been poured or the pressure in the cavity is low in the early stage of pouring, the sealing plate 10 is kept in the upward sealing position under the action of the tension spring 12 to prevent outside air from entering the cavity or molten metal from flowing back into the exhaust channel.

[0025] Please see Figures 3-5 As a further implementation of the overall equipment: a connecting block 11 is fixedly provided at the top of the guide block, and a tension spring 12 is provided between the connecting block 11 and the connecting sleeve 7.

[0026] The guide rod 8 is polygonal and slidably connected to the connecting sleeve 7.

[0027] A sealing ring 13 is fixedly provided on the outer side of the sealing plate 10, and a sealing groove 14 is provided on the bottom surface of the connecting sleeve 7.

[0028] Multiple sets of sealing rings 13 and sealing grooves 14 are provided, with multiple sets of sealing rings 13 abutting against the sealing grooves 14.

[0029] A limiting plate 15 is fixedly provided on the inner side of the connecting sleeve 7, and the limiting plate 15 is slidably connected to the slide rod 9.

[0030] A sealing block 16 is fixedly provided on the outer wall of the sealing plate 10. Multiple sets of sealing blocks 16 are provided. A sealing hole 17 is opened on the outer wall of the limiting plate 15. Multiple sets of sealing holes 17 are provided and are slidably connected to multiple sets of sealing blocks 16 respectively.

[0031] The connecting pipe 6 and the exhaust port 5 are set concentrically.

[0032] More specifically, when the molten metal is poured into the mold cavity, the air and gases generated during the casting process are compressed, causing the pressure to rise rapidly. These gases enter the mounting plate 2 through the pre-set vent holes 5 in the upper mold 4, and then flow upward into the connecting sleeve 7 via the connecting pipe 6, which is concentric with the vent holes 5. When the gas pressure in the mold cavity exceeds the preload of the tension spring 12, the gas pushes the sealing plate 10 downward against the elastic force of the tension spring 12. The guide rod 8 slides down in the connecting sleeve 7, and the sliding rod 9 moves down simultaneously. The top surface of the sealing plate 10 gradually detaches from the bottom surface of the connecting sleeve 7, and the multiple sets of sealing rings 13 exit from the multiple sets of sealing grooves 14, opening the venting channel to allow the gas to escape. The multiple sets of sealing blocks 16 slide down along the multiple sets of sealing holes 17. The limiting plate 15 always guides the slide rod 9 to ensure that the sealing plate 10 descends smoothly without tilting. Gas is discharged outward from the gap between the sealing plate 10 and the connecting sleeve 7. When the gas in the cavity is basically exhausted and the pressure decreases, the tension spring 12 restores its elasticity and pulls the sealing plate 10 back to the sealing position. Multiple sets of sealing rings 13 are inserted into multiple sets of sealing grooves 14 to restore the sealing state. This effectively prevents the molten metal from drawing back air or rising into the exhaust channel during solidification, causing blockage. At the same time, this automatic response sealing mechanism ensures that the casting will not have porosity defects due to gas retention. The entire exhaust and sealing process is automatically cyclically adjusted according to the pressure changes in the cavity, ensuring the stability of the casting quality.

[0033] In summary, during the use or operation of the overall equipment: before the casting operation begins, the tension spring 12 is in its natural state. The guide rod 8 is pulled upwards by the connecting block 11, causing it to slide axially upwards within the connecting sleeve 7. The guide rod 8 employs a polygonal design to engage with the inner wall of the connecting sleeve 7, ensuring stability by preventing rotation during sliding. The guide rod 8 drives the bottom sliding rod 9 and the sealing plate 10 upwards together. The top surface of the sealing plate 10 remains in contact with the bottom surface of the connecting sleeve 7. At this time, the multiple sets of sealing rings 13 fixed to the outer side of the sealing plate 10 are fully inserted into the multiple sets of sealing grooves 1 on the bottom surface of the connecting sleeve 7. Inside 4, a tight sealing structure is formed. The connecting pipe 6 and the exhaust hole 5 in the mounting plate 2 are concentrically set to ensure the smooth flow of gas. Multiple sets of sealing blocks 16 fixed on the outer wall of the sealing plate 10 slide into the corresponding sets of sealing holes 17 on the outer wall of the limiting plate 15. The limiting plate 15 guides and limits the sliding rod 9 to prevent the sealing plate 10 from shifting. The entire exhaust channel is in a closed standby state. When the molten metal has not yet been poured or the pressure in the cavity is low in the early stage of pouring, the sealing plate 10 is kept in the upward sealing position under the action of the tension spring 12 to prevent outside air from entering the cavity or molten metal from flowing back into the exhaust channel.

[0034] When molten metal is poured into the mold cavity, the air and gases generated during the casting process are compressed, causing the pressure to rise rapidly. These gases enter the mounting plate 2 through the pre-set vent holes 5 in the upper mold 4, and then flow upward into the connecting sleeve 7 via the connecting pipe 6, which is concentric with the vent holes 5. When the gas pressure in the mold cavity exceeds the preload of the tension spring 12, the gas pushes the sealing plate 10 downward against the elastic force of the tension spring 12. The guide rod 8 slides down inside the connecting sleeve 7, and the sliding rod 9 moves downward simultaneously. The top surface of the sealing plate 10 gradually detaches from the bottom surface of the connecting sleeve 7, and the multiple sets of sealing rings 13 subsequently exit from the multiple sets of sealing grooves 14, opening the venting channel to allow gas to escape. The multiple sets of sealing blocks 16 slide downward along the multiple sets of sealing holes 17. The limiting plate 15 always guides the slide rod 9 to ensure that the sealing plate 10 descends smoothly without tilting. Gas is discharged outward from the gap between the sealing plate 10 and the connecting sleeve 7. When the gas in the cavity is basically exhausted and the pressure decreases, the tension spring 12 restores its elasticity and pulls the sealing plate 10 back to the sealing position. Multiple sets of sealing rings 13 are inserted into multiple sets of sealing grooves 14 to restore the sealing state. This effectively prevents the molten metal from drawing back air or rising into the exhaust channel during solidification, causing blockage. At the same time, this automatic response sealing mechanism ensures that the casting will not have porosity defects due to gas retention. The entire exhaust and sealing process is automatically cyclically adjusted according to the pressure changes in the cavity, ensuring the stability of the casting quality.

[0035] Of all the solutions mentioned above, those involving connections between two components can be selected based on the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. These will not be elaborated on here. For all the fixed connections mentioned above, welding is the preferred option.

[0036] In all the solutions mentioned above, the operation of electrical components, unless otherwise specified, is controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and wiring connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here. The specific models and specifications of the electrical components involved in this solution need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, and therefore will not be described in detail.

[0037] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be described in detail in this utility model.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A venting and anti-air hole structure for a casting mold of mechanical parts, comprising a top plate (1), characterized in that: The top plate (1) is fixedly provided with an installation plate (2), the outer wall of the installation plate (2) is fixedly provided with a guide post (3), the upper mold (4) is fixedly provided inside the installation plate (2), the upper mold (4) and the installation plate (2) are provided with an exhaust hole (5), the outer wall of the installation plate (2) is connected with a connecting pipe (6), the bottom end of the connecting pipe (6) is connected with a connecting sleeve (7), the connecting sleeve (7) is slidably provided with a guide rod (8), the bottom end of the guide rod (8) is fixedly provided with a sliding rod (9), the bottom end of the sliding rod (9) is fixedly provided with a sealing plate (10), the top surface of the sealing plate (10) abuts against the bottom surface of the connecting sleeve (7).

2. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 1, characterized in that: A connecting block (11) is fixedly provided at the top of the guide block, and a tension spring (12) is provided between the connecting block (11) and the connecting sleeve (7).

3. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 2, characterized in that: The guide rod (8) is polygonal and slidably connected to the connecting sleeve (7).

4. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 3, characterized in that: A sealing ring (13) is fixedly provided on the outside of the sealing plate (10), and a sealing groove (14) is provided on the bottom surface of the connecting sleeve (7).

5. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 4, characterized in that: Multiple sets of sealing rings (13) and sealing grooves (14) are provided, and multiple sets of sealing rings (13) abut against the sealing grooves (14).

6. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 5, characterized in that: The connecting sleeve (7) is fixedly provided with a limiting plate (15), and the limiting plate (15) is slidably connected to the slide rod (9).

7. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 6, characterized in that: The sealing plate (10) has a sealing block (16) fixed on its outer wall. There are multiple sets of sealing blocks (16). The limiting plate (15) has a sealing hole (17) on its outer wall. There are multiple sets of sealing holes (17) and they are slidably connected to multiple sets of sealing blocks (16).

8. The venting and anti-air hole structure for a casting mold of mechanical parts according to claim 7, characterized in that: The connecting pipe (6) and the exhaust port (5) are arranged concentrically.

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