Sand leakage prevention sealing structure of lost foam casting sand box

Abstract

The utility model relates to the field of lost foam casting technology, concretely is the sand leakage prevention sealing structure of lost foam casting sand box, including support base, the sand box is provided with on support base upper end, the upper surface right end of sand box is rotatively connected with sealing mechanism, the lower end of sand box front and back two side surfaces all installs the limiting mechanism, sealing mechanism includes sealing door, two fixed blocks of welding in sealing door left side surface upper end front and back two sides and install the rotary lever in fixed block, sealing door left side surface middle position is provided with sealing plate. The utility model discloses setting up rubber sealing sheet and sealing plate in sealing door, and double sealing process can effectively improve the sealing property of sealing mechanism, after respectively pulling open the limiting mechanism of two sides outward, sand can very easily knock open sealing door under the action of gravity to make sand can smoothly discharge, can more conveniently discharge sand.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting technology, specifically to a leak-proof sealing structure for a lost foam casting sand box. Background Technology

[0002] Lost foam casting is a novel casting method that involves bonding and assembling paraffin or foam models similar in size and shape to the casting into a model cluster. After being coated with refractory paint and dried, the cluster is embedded in dry quartz sand and vibrated to create the model. Under negative pressure, the casting is poured, causing the model to vaporize and the liquid metal to occupy the model's position. After solidification and cooling, the casting is formed. During casting, a layer of dry sand about 100mm thick is first laid on the bottom of the sand box. Then, the coated EPS model and the gating gate are placed in the center of the sand box. Sand is added and compacted while being vibrated until the dry sand is about 50mm from the top surface of the sand box. Then, the sand is stopped. A plastic film is covered on top of the dry sand. Then, the pouring cup is placed on top of the sprue, and a layer of loose sand is sprinkled on the film to prevent molten iron from splashing and burning through the film during pouring, which could lead to air leakage and collapse of the casting box.

[0003] Utility model patent CN220387867U discloses a sand unloading mechanism for lost foam casting sand boxes. This utility model includes a base with two connecting blocks mounted on it. A sand box is rotatably mounted on the two connecting blocks, and a sealing door is rotatably mounted on the sand box. Through the design of a cleaning plate, buffer spring, and limiting rod, when sand needs to be unloaded, the first threaded rod is unscrewed outside the sealing door, removing its restriction. Then, the motor is started, and its rotation drives the T-shaped slider to slide, causing one end of the connecting rod to rotate and slide, while the other end moves in an arc, gradually causing the sand box to rotate and tilt. This, in turn, causes the sealing door to rotate perpendicular to the ground, exposing the outlet and allowing the sand to fall out. After the sand has fallen out, the cleaning plate slides downwards under its own weight, causing the bristles on it to clean the inner wall of the sand box until the sand at the outlet is completely removed, preventing interference with the resetting of the sealing door.

[0004] While the aforementioned utility model can easily clean the sand, the rubber sealing strip only seals on one side when the sealing door is in the sealed state, resulting in poor sealing performance. Therefore, we propose a sand-leakage-proof sealing structure for lost foam casting sand boxes. Utility Model Content

[0005] This utility model provides a leak-proof sealing structure for lost foam casting sand boxes to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: The anti-leakage sealing structure of the lost foam casting sand box includes a support base, a sand box is provided on the upper end of the support base, a sealing mechanism is rotatably connected to the right end of the upper surface of the sand box, and a limit mechanism is installed on the lower right end of both the front and rear surfaces of the sand box. The sealing mechanism includes a sealing door, two fixing blocks welded to the front and rear sides of the upper part of the left side surface of the sealing door, and a rotating rod installed in the fixing blocks. A sealing plate is provided in the middle of the left side surface of the sealing door, and rubber sealing sheets are attached around the left side surface of the sealing door. Limiting holes are opened at the lower ends of the front and rear sides of the sealing plate.

[0007] As a preferred technical solution, the four sides of the sealing plate are attached to the inner wall of the sand box, and the front edge of the lower surface of the sealing plate is rounded.

[0008] This feature, where the sealing plate fits snugly against the inner wall of the sand box, eliminates gaps between the sealing plate and the sand box, blocking the channels for sand particles to leak from the side wall gaps and further enhancing the leak-proof effect.

[0009] As a preferred technical solution, a sand outlet is provided on the right side of the sand box, a support column is welded to the upper end of the sand outlet, a rotating hole is opened on the side surface of the support column, and mounting holes are opened at the lower right ends of both the front and rear side walls of the sand box.

[0010] This design provides a channel for sand discharge through the sand outlet, meeting the needs of sand replacement and cleaning in casting production; the rotating hole on the support column provides a precise assembly point for the rotating rod of the sealing mechanism.

[0011] As a preferred technical solution, the rotating rod is rotatably connected inside the rotating hole, and the length of the rotating rod is equal to the length of the support column.

[0012] This feature, with the rotating rod and rotating hole connected, allows the sealing mechanism to rotate flexibly around the support column, enabling the sealing door to open and close normally.

[0013] As a preferred technical solution, the limiting mechanism includes a limiting block, a movable rod welded to the front surface of the limiting block, and an auxiliary block welded to the top of the movable rod. A support frame is slidably connected to the outer surface of the movable rod, and a spring is welded to the rear surface of the support frame. An auxiliary plate is welded to the other end of the spring, and the other end of the spring is welded to the middle area of ​​the side surface of the movable rod through the auxiliary plate. The auxiliary plate is in close contact with the outer surface of the sand box.

[0014] In this configuration, the other end of the spring is welded to the middle area of ​​the side surface of the moving rod via an auxiliary plate. This structural design of the limiting mechanism allows the spring to provide elastic restoring force. When the sealing door is closed, it can push the limiting block to automatically engage with the limiting hole of the sealing plate, achieving automatic locking of the sealed state without the need for manual locking, thus simplifying the operation process.

[0015] As a preferred technical solution, the movable rod is slidably connected inside the mounting hole, and the support frame is welded to the side surface of the sand box around the mounting hole.

[0016] This setting ensures that the limit block is positioned accurately during movement and can stably engage with the limit hole.

[0017] As a preferred technical solution, the top view of the limiting block is a right-angled triangle, the top of the limiting block is rounded, and the inclined surface of the limiting block is smooth.

[0018] This design, with its right-angled triangular structure, allows the inclined surface of the limit block to contact and be compressed against the sealing plate when the sealed door is closed. This, in turn, pushes the moving rod to move, enabling the limit block to retract automatically and completing the sealing door closing action without manual intervention.

[0019] As a preferred technical solution, the auxiliary block is disc-shaped, and the outer surface of the auxiliary block is provided with anti-slip texture. When no external force is applied, the auxiliary block and the support frame fit together.

[0020] This design features a disc-shaped auxiliary block that is easy for operators to grip and apply force to, while the anti-slip texture increases the friction between the hand and the auxiliary block, preventing slippage during operation and making the unlocking of the limit mechanism easier and more efficient. Compared with the prior art, the beneficial effects of this utility model are: 1. By installing rubber sealing sheets and sealing plates inside the sealed door, the double sealing process can effectively improve the sealing performance of the sealing mechanism.

[0021] 2. After the limiting mechanisms on both sides are pulled outwards, the sand can easily break open the sealing door under the action of gravity, allowing the sand to be discharged smoothly and more conveniently. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the sand box in this utility model; Figure 3 This is a schematic diagram of the sealing mechanism in this utility model; Figure 4 This is a schematic diagram of the limiting mechanism in this utility model; The meanings of the labels in the diagram are as follows: 100, Support base; 200, Sand box; 210, Sand outlet; 220, Support column; 230, Rotating hole; 240, Mounting hole; 300, Sealing mechanism; 310, Sealing door; 320, Fixing block; 330, Rotating rod; 340, Sealing plate; 350, Rubber sealing sheet; 360, Limiting hole; 400, Limiting mechanism; 410, Limiting block; 420, Moving rod; 430, Support frame; 440, Auxiliary block; 450, Spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Please see Figures 1-4 This embodiment provides a technical solution: The anti-leakage sealing structure of the lost foam casting sand box includes a support base 100, a sand box 200 is provided on the upper end of the support base 100, a sealing mechanism 300 is rotatably connected to the right end of the upper surface of the sand box 200, and a limit mechanism 400 is installed on the lower right end of the front and rear surfaces of the sand box 200. The sealing mechanism 300 includes a sealing door 310, two fixing blocks 320 welded to the front and rear sides of the upper left side surface of the sealing door 310, and a rotating rod 330 installed in the fixing blocks 320. A sealing plate 340 is provided in the middle of the left side surface of the sealing door 310, and rubber sealing sheets 350 are attached around the left side surface of the sealing door 310. Limiting holes 360 are provided at the lower ends of the front and rear sides of the sealing plate 340. Through the above mechanism, the sealing mechanism 300 can effectively seal the sand box 200 under the double sealing of the rubber sealing sheet 350 and the sealing plate 340.

[0024] Furthermore, such as Figure 3 As shown, the four sides of the sealing plate 340 are attached to the inner wall of the sand box 200, and the front edge of the lower surface of the sealing plate 340 is rounded to prevent the sealing plate 340 from rotating and hitting the inner lower surface of the sand box 200.

[0025] Furthermore, such as Figure 2 As shown, a sand outlet 210 is provided on the right side of the sand box 200. A support column 220 is welded to the upper end of the sand outlet 210. A rotating hole 230 is opened on the side surface of the support column 220, which passes through the support column 220. Mounting holes 240 are opened at the lower right ends of the front and rear side walls of the sand box 200. The mounting holes 240 are used for the installation and positioning of the limiting mechanism 400.

[0026] In this embodiment, asFigure 1 As shown, the rotating rod 330 is rotatably connected inside the rotating hole 230. The length of the rotating rod 330 is equal to the length of the support column 220, ensuring that the sealing door 310 will not wobble back and forth after installation.

[0027] In this embodiment, as Figure 4 As shown, the limiting mechanism 400 includes a limiting block 410, a moving rod 420 welded to the front surface of the limiting block 410, and an auxiliary block 440 welded to the top of the moving rod 420. A support frame 430 is slidably connected to the outer surface of the moving rod 420. A spring 450 is welded to the rear surface of the support frame 430. An auxiliary plate is welded to the other end of the spring 450. The other end of the spring 450 is welded to the middle area of ​​the side surface of the moving rod 420 through the auxiliary plate. The spring 450 applies force to the moving rod 420 through the auxiliary plate. The auxiliary plate is in close contact with the outer surface of the sand box 200.

[0028] In this embodiment, as Figure 1 As shown, the movable rod 420 is slidably connected inside the mounting hole 240, and the support frame 430 is welded to the side surface of the sand box 200 around the mounting hole 240. The support frame 430 is welded and fixed to the surface of the sand box 200, which improves the overall stability of the limiting mechanism 400, prevents the limiting mechanism 400 from being displaced or loosened due to vibration and other factors during use, ensures the long-term reliability of the limiting function, and thus maintains the leak-proof effect of the sealing structure.

[0029] In this embodiment, as Figure 4 As shown, the top view of the limiting block 410 is a right-angled triangle. The top of the limiting block 410 is rounded, and the inclined surface of the limiting block 410 is smooth, which reduces the frictional resistance between the sealing plate 340 and the limiting block 410. The auxiliary block 440 is disc-shaped, and the outer surface of the auxiliary block 440 is provided with anti-slip texture to increase the friction generated by the user's grip. When no external force is applied, the auxiliary block 440 and the support frame 430 fit together, which can limit the free sliding of the moving rod 420 and prevent the limiting block 410 from disengaging from the limiting hole 360 ​​due to the accidental movement of the moving rod 420, thus ensuring that the limiting mechanism 400 is always in a stable locked state.

[0030] It is worth noting that the structure and working principle of the rubber sealing sheet 350 and spring 450 involved in this embodiment are as known to those skilled in the art, and will not be described in detail here. The structure and working principle of the support seat 100 involved in this embodiment are all technologies disclosed in the prior art, and will not be described in detail here.

[0031] In this embodiment, the anti-sand sealing structure of the lost foam casting sand box is used so that when the sand needs to be discharged after casting, the limiting mechanisms 400 set on the front and rear sides of the sand box 200 are operated. The user holds the auxiliary blocks 440 inside the limiting mechanisms 400 at both ends with both hands and applies an outward force to them, causing the moving rod 420 to move outward, driving the limiting block 410 to move outward until it leaves the limiting hole 360. At this time, the limiting mechanism 400 releases the lock on the sealing mechanism 300, and the user can release his hands. The sand box 200 can then move around the support base 100. When rotated and tilted, the sand generates a lateral thrust. The sand in the sand box 200 pushes open the sealing door 310 and is discharged from the sand box 200 through the sand outlet 210. The sealing door 310 can rotate around the support column 220 via the rotating rod 330. When the sand box 200 rotates on the support base 100, the sealing door 310 rotates along with it under the action of gravity. After all the sand in the sand box 200 is discharged, the user can press the sealing door 310 towards the sand outlet 210 by hand. The inclined design of the limiting block 410 causes the sealing plate 340 to be squeezed and moved outward during the process of entering the sand outlet 210. The spring 450 is compressed by the movement of the auxiliary plate located at the outer end of the moving rod 420 until the limiting hole 360 ​​reaches the front end of the limiting block 410. The spring 450 pushes the auxiliary plate to move the moving rod 420, pushing the limiting block 410 into the limiting hole 360, thus completing the limiting of the sealing mechanism 300.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leak-proof sealing structure for a lost foam casting sand box, including a support base (100), characterized in that: A sand box (200) is provided on the upper end of the support base (100). A sealing mechanism (300) is rotatably connected to the right end of the upper surface of the sand box (200). Limiting mechanisms (400) are installed on the lower right ends of the front and rear surfaces of the sand box (200). The sealing mechanism (300) includes a sealing door (310), two fixing blocks (320) welded to the front and rear sides of the upper left side surface of the sealing door (310), and a rotating rod (330) installed in the fixing blocks (320). A sealing plate (340) is provided in the middle of the left side surface of the sealing door (310), and rubber sealing sheets (350) are attached around the left side surface of the sealing door (310). Limiting holes (360) are opened at the lower ends of the front and rear sides of the sealing plate (340).

2. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 1, characterized in that: The four sides of the sealing plate (340) are attached to the inner wall of the sand box (200), and the front edge of the lower surface of the sealing plate (340) is rounded.

3. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 1, characterized in that: The sand box (200) has a sand outlet (210) on the right side. A support column (220) is welded to the upper end of the sand outlet (210). A rotating hole (230) is opened on the side surface of the support column (220) and a mounting hole (240) is opened at the lower right end of both the front and rear side walls of the sand box (200).

4. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 3, characterized in that: The rotating rod (330) is rotatably connected inside the rotating hole (230), and the length of the rotating rod (330) is equal to the length of the support column (220).

5. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 4, characterized in that: The limiting mechanism (400) includes a limiting block (410), a moving rod (420) welded to the front surface of the limiting block (410), and an auxiliary block (440) welded to the top of the moving rod (420). A support frame (430) is slidably connected to the outer surface of the moving rod (420). A spring (450) is welded to the rear surface of the support frame (430). An auxiliary piece is welded to the other end of the spring (450). The other end of the spring (450) is welded to the middle area of ​​the side surface of the moving rod (420) through the auxiliary piece. The auxiliary piece is in close contact with the outer surface of the sand box (200).

6. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 5, characterized in that: The movable rod (420) is slidably connected inside the mounting hole (240), and the support frame (430) is welded to the side surface of the sand box (200) around the mounting hole (240).

7. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 5, characterized in that: The top view of the limiting block (410) is a right triangle shape. The top of the limiting block (410) is rounded and the slope of the limiting block (410) is smooth.

8. The anti-leakage sealing structure of the lost foam casting sand box as described in claim 5, characterized in that: The auxiliary block (440) is disc-shaped, and the outer surface of the auxiliary block (440) is provided with anti-slip texture. When no external force is applied, the auxiliary block (440) and the support frame (430) fit together.

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