Self-cleaning exhaust assembly for ejector rod of cold core box

Abstract

The utility model discloses a self-cleaning exhaust assembly of a cold core box ejector rod. The self-cleaning exhaust assembly comprises a cold core box body, an ejector rod and a driving device, a cleaning rod is arranged in the cold core box body and transversely penetrates through the ejector rod from openings in the two sides of the ejector rod, when the ejector rod moves up and down, the exhaust channel moves up and down relative to the cleaning rod, and when the interior of the exhaust channel is blocked by resin sand, the cleaning rod is closed. The cleaning rod can scatter gathered and blocked resin sand so that the resin sand can be discharged out of the exhaust channel from the opening in the bottom or the two sides of the exhaust channel, and the self-cleaning effect on resin sand blocking is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of casting and pouring systems. Background Technology

[0002] In the field of casting technology, in the technique of forming sand cores using the cold box method, an ejector rod is used inside the cold box to push the sand core out from the bottom. For example, Chinese utility model patent CN219292673U discloses an ejector rod structure used in a cold box mold. As shown in Figure 4 of that patent, the ejector rod has a hollow venting channel inside, and an vent port on the side of the ejector rod that communicates with the venting channel. The venting channel is used to expel the air squeezed out during sand injection forming of the sand core in the cold box.

[0003] However, the cold core molding method uses resin sand, which is highly adhesive. Typically, after a few injection cycles, the venting channels of the ejector pin become clogged with the sticky resin sand and are difficult to clean. This blockage of the venting channels significantly impacts the molding yield of the core.

[0004] Therefore, a new technical solution is needed to solve the above problems. Utility Model Content

[0005] To address the problems arising from existing technologies, this utility model provides a self-cleaning venting assembly for the cold core box top rod, which can automatically clean the resin sand in the venting channel when the top rod of the cold core box is ejected.

[0006] To achieve the above objectives, the self-cleaning exhaust assembly for the cold core box top rod of this utility model can adopt the following technical solution:

[0007] A self-cleaning exhaust assembly for a cold core box top rod includes a cold core box body, a top rod, and a driving device. The cold core box body has a slot for receiving the top rod, the slot extending vertically through the body. The top rod has a hollow exhaust channel extending vertically inside, and openings communicating with the exhaust channel are provided on both sides of the top rod. The driving device is located at the bottom of the top rod to drive its vertical movement. The bottom of the exhaust channel passes through the top rod. A laterally extending cleaning rod is provided within the slot, the cleaning rod extending laterally through the openings on both sides of the top rod, the opening range along the axial direction of the top rod being greater than the width of the cleaning rod along the axial direction of the top rod.

[0008] Furthermore, both ends of the cleaning rod are fixed to the side walls on both sides of the slot.

[0009] Furthermore, the axial direction of the cleaning rod is perpendicular to the circumferential direction of the top rod.

[0010] Furthermore, a gap is left between the opening of the push rod and the side wall of the slot.

[0011] Furthermore, the top of the top rod is provided with an exhaust plug, which has several parallel exhaust grooves inside, and the exhaust grooves are connected to the exhaust channel.

[0012] Beneficial Effects: The self-cleaning venting assembly for the cold core box top rod provided by this utility model includes a cleaning rod. This cleaning rod extends laterally through the top rod from both sides of the top rod, and the opening range along the axial direction of the top rod is greater than the width of the cleaning rod along the axial direction of the top rod. That is, when the top rod moves up and down, the venting channel also moves up and down relative to the cleaning rod. When the venting channel is blocked by resin sand, the cleaning rod can disperse the accumulated and blocked resin sand, allowing the resin sand to be discharged from the venting channel through the openings at the bottom or sides. Since the top rod needs to move up and down each time it ejects the sand core, it can self-clean the venting channel from resin sand blockage each time it ejects the sand core. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the self-cleaning exhaust assembly of the cold core box top rod of this utility model;

[0014] Figure 2 This is a three-dimensional perspective view of the self-cleaning exhaust assembly of the cold core box top rod of this utility model (driving device not shown);

[0015] Figure 3 This is a perspective sectional view of the self-cleaning exhaust assembly of the cold core box top rod of this utility model (the drive device is not shown). Detailed Implementation

[0016] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0017] Please see Figures 1 to 3 As shown, this utility model discloses a self-cleaning venting assembly for a cold core box top rod, including a cold core box body 1, a top rod 2, and a driving device 3. The driving device 3 is located at the bottom of the top rod 2 and is used to drive the top rod 2 to move up and down; in this embodiment, the driving device 3 is a hydraulic cylinder.

[0018] The cold core box body 1 has a slot 4 for receiving the top rod 2. The slot 4 passes through the cold core box body 1 vertically, allowing the top rod 2 to move up and down in the slot 4. The drive device 3 is installed below the slot 4.

[0019] The top rod 2 has a hollow exhaust channel 5 extending vertically inside, and openings 6 on both sides of the top rod 2 communicating with the exhaust channel 5; the bottom of the exhaust channel 5 penetrates the top rod 2. An exhaust plug 7 is located at the top of the top rod 2, and the exhaust plug 7 has several parallel exhaust grooves inside, which communicate with the exhaust channel 5. The exhaust plug 7, by setting the exhaust grooves, can filter the resin sand injected into the cold core box to a certain extent by ensuring smooth exhaust flow in the exhaust channel. However, a small amount of resin sand will still enter the exhaust channel 5 through the exhaust grooves. As the cold core box is used more frequently, the accumulated resin sand entering the exhaust channel 5 will eventually block it.

[0020] A laterally extending cleaning rod 8 is provided within the slot 4. This cleaning rod 8 passes laterally through the openings 6 on both sides of the top rod 2, and its two ends are fixed to the side walls of the slot 4. The opening range of the opening 6 along the axial direction of the top rod 2 is greater than the width of the cleaning rod 8 along the axial direction of the top rod 2. Therefore, when the top rod 2 moves up and down, the exhaust channel 5 also moves up and down relative to the cleaning rod. When the exhaust channel is blocked by resin sand, the cleaning rod can disperse the accumulated resin sand, allowing it to exit the exhaust channel from the bottom or the openings on both sides. Since the top rod needs to move up and down each time it ejects the sand core, it can self-clean the exhaust channel from resin sand blockage each time it ejects the sand core. A gap is left between the opening 6 of the top rod and the side wall of the slot 4; and as mentioned above, the bottom of the exhaust channel 5 passes through the top rod 2, so the dispersed resin sand can be discharged from the opening 6 and the bottom of the exhaust channel 5.

Claims

1. A self-cleaning exhaust assembly for a cold core box top rod, comprising a cold core box body, a top rod, and a driving device; the cold core box body has a slot for receiving the top rod, the slot extending vertically through the cold core box body; the top rod has a hollow exhaust channel extending vertically inside, and both sides of the top rod have openings communicating with the exhaust channel; the driving device is located at the bottom of the top rod for driving the top rod to move vertically; characterized in that, The bottom of the exhaust channel passes through the top rod; a cleaning rod extending laterally is provided in the slot, which passes laterally through the openings on both sides of the top rod, and the opening range along the axial direction of the top rod is greater than the width of the cleaning rod along the axial direction of the top rod.

2. The self-cleaning exhaust assembly for the cold core box top rod according to claim 1, characterized in that, The two ends of the cleaning rod are fixed to the side walls on both sides of the slot.

3. The self-cleaning exhaust assembly for the cold core box top rod according to claim 2, characterized in that, The axial direction of the cleaning rod is perpendicular to the circumferential direction of the top rod.

4. The self-cleaning exhaust assembly for the cold core box top rod according to claim 3, characterized in that, A gap is left between the opening of the push rod and the side wall of the slot.

5. The self-cleaning exhaust assembly for the cold core box top rod according to claim 1, characterized in that, The top of the top rod is provided with an exhaust plug, which has several parallel exhaust grooves inside, and the exhaust grooves are connected to the exhaust channel.

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