Sand airing equipment for lost foam casting hammerhead

Abstract

The utility model provides sand airing equipment for an evanescent mode casting hammerhead, which relates to the technical field of sand airing for casting hammerheads and comprises a smashing box, a collecting box is arranged at the bottom of the smashing box, two ventilation openings are symmetrically formed in the box wall of the collecting box, and fans are arranged in the ventilation openings. A rotary filter screen is mounted on the bottom surface of the lifting filter screen, falling foundry sand can be gathered in the hollow barrel by changing the position of the rotary filter screen, the position of the rotary filter screen is changed again, layered placement of the foundry sand accumulated in the hollow barrel is realized by utilizing the rotary filter screen and the lifting filter screen, and then the hollow barrel ascends through the lifting barrel; and by means of the connecting ropes with different lengths, displacement of the multiple layers of rotary filter screens is achieved, the casting sand in the middle-layer area is exposed in air, and the casting sand in the middle-layer area can be rapidly cooled conveniently.

Description

Technical Field

[0001] This utility model relates to the field of sand drying technology for casting hammerheads, and in particular to a sand drying device for lost foam casting hammerheads. Background Technology

[0002] Hammer casting is a process in which metal material is melted and poured into a mold of a specific shape, and after cooling and solidification, a casting with the desired shape and properties is obtained. The sand and gravel used in casting need to be dried and cooled before reuse.

[0003] Therefore, a sand-drying device for lost foam casting hammerheads, disclosed in CN221246853U, is described. A starting torque motor drives multiple agitator rods to rotate and agitate the lumpy casting sand entering the sand-drying box. A baffle plate blocks any un-aggregated lumpy casting sand to ensure thorough agitation, while the agitated casting sand falls through the baffle plate into a collection box. Simultaneously, an exhaust fan rotates to expel most of the heat from the sand-drying box, thus initially cooling the casting sand inside. Meanwhile, a heat-absorbing plate absorbs heat from the bottom of the collection box, further cooling the collection box and the casting sand within. Cooling water from an external cooling tower flows into a first guide pipe through a water inlet pipe. The first guide pipe disperses the cooling water into multiple inlet pipes, which then guide the cooling water into multiple through-cavities, absorbing heat from the heat-absorbing plates, thus rapidly and thoroughly cooling the heat-absorbing plates.

[0004] However, when most of the crushed foundry sand falls into the collection box through the baffle plate, it will shorten the time it stays on the baffle plate. Therefore, the cooling effect of the exhaust fan blades on the falling foundry sand will be reduced. The foundry sand falling into the collection box will accumulate. The heat absorption plate can only cool the foundry sand accumulated in the bottom area of ​​the collection box. The heat of the foundry sand inside cannot be quickly discharged, which will affect the cooling efficiency of the foundry sand accumulated in the collection box. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art by proposing a sand drying device for lost foam casting hammers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sand drying device for lost foam casting hammerheads, comprising a crushing box, a collection box at the bottom of the crushing box, two symmetrical ventilation openings on the wall of the collection box, and a fan installed inside the ventilation openings, a hollow barrel inside the collection box, a central shaft fixedly connected to the bottom of the hollow barrel, a lifting cylinder sleeved on the central shaft, and a plurality of lifting filter screens distributed from top to bottom and rising and falling along the depth direction of the hollow barrel on the outer wall of the lifting cylinder, the lifting filter screens being fan-shaped and having rotating filter screens inserted into the lifting cylinder rotatably connected to their bottom surfaces, connecting ropes connecting adjacent rotating filter screens near the lifting cylinder, the lengths of the connecting ropes increasing sequentially from top to bottom, an electric telescopic rod extending inward from one side of the hollow barrel opening and fixedly connected, the telescopic end of the electric telescopic rod being a ring-shaped arrangement sleeved on the central shaft and rotatably connected to the top of the lifting cylinder.

[0007] Preferably, the bottom edge of the hollow barrel is fixedly connected with several limiting rods arranged in a circular array and parallel to the central axis. The limiting rods pass through the sides of several lifting filters, and the bottom edge of the lifting filters is fixedly connected with a sleeve sleeved on the limiting rod.

[0008] Preferably, a gear ring is fixedly connected to the outer wall of the lifting cylinder near the top, and a motor is fixedly connected to the surface of the lifting filter screen at the upper position. The main shaft of the motor is fixedly connected to a gear for meshing with the gear ring.

[0009] Preferably, the lifting filter and the rotating filter have an arc of not less than 180 degrees, and the outer edge of the lifting filter extends outward to a ring shape with the same center as the hollow barrel.

[0010] Preferably, the inner side of the lifting filter screen is fitted with the outer wall of the lifting cylinder with a clearance, and the inner side of the rotating filter screen is used to cover the gap between the lifting filter screen and the lifting cylinder.

[0011] Preferably, it also includes a stirring rod disposed inside the grinding chamber, and a baffle plate is also disposed inside the grinding chamber. Several baffles are fixedly connected to the upper surface of the baffle plate and are slidably connected to the gap between two adjacent stirring rods inside the grinding chamber.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows.

[0013] 1. In this utility model, by setting up several layers of lifting filter screens and installing a rotating filter screen on the bottom surface of the lifting filter screens, the falling casting sand can be collected in the hollow barrel by changing the position of the rotating filter screen. The position of the rotating filter screen can be changed again, and the casting sand accumulated in the hollow barrel can be placed in layers by using the rotating filter screen and the lifting filter screen. Then, the barrel is raised by the lifting cylinder, and the displacement of several layers of rotating filter screens is achieved by using connecting ropes of different lengths, so that the casting sand in the middle layer is exposed to the air, which facilitates the rapid cooling of the casting sand in the middle layer.

[0014] 2. In this utility model, by setting baffles on the barrier mesh plate, the blocky casting sand in the crushing box is moved by the stirring rod to pass through several baffles, and the crushing is achieved by the extrusion and shearing force generated by the relative movement of the baffles and the stirring rod. Attached Figure Description

[0015] Figure 1 This utility model presents a three-dimensional structural diagram of a sand-drying device for lost foam casting hammerheads.

[0016] Figure 2 This utility model proposes a sand drying device for lost foam casting hammerheads. Figure 1 A schematic diagram of the exploded cross-section structure.

[0017] Figure 3 This utility model presents a cross-sectional structural diagram of a hollow barrel for a sand drying device used in lost foam casting of hammerheads.

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] Legend: 1. Grinding tank; 2. Collection tank; 3. Fan; 4. Barrier mesh; 5. Baffle; 6. Ventilation opening; 7. Hollow barrel; 8. Central shaft; 9. Lifting filter screen; 10. Sleeve; 11. Limiting rod; 12. Rotating filter screen; 13. Lifting cylinder; 14. Gear ring; 15. Electric telescopic rod; 16. Motor; 17. Gear; 18. Connecting rope. Detailed Implementation

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] like Figure 1-4 As shown, a sand-drying device for lost foam casting hammerheads includes a crushing box 1, a collection box 2 at the bottom of the crushing box 1, and two symmetrical ventilation openings 6 on the wall of the collection box 2. A fan 3 is installed inside each ventilation opening 6. During use, one fan 3 draws air from the inside while the other fan 3 blows air, achieving air circulation within the collection box 2 and rapid exhaust of internal hot air. A hollow barrel 7 is installed inside the collection box 2. A central shaft 8 is fixedly connected to the bottom of the hollow barrel 7. A lifting cylinder 13 is fitted onto the central shaft 8. Several lifting filters 9, distributed from top to bottom and moving up and down along the depth direction of the hollow barrel 7, are fitted onto the outer wall of the lifting cylinder 13. The lifting filters 9 are fan-shaped and rotatably connected to the bottom surface of the lifting cylinder 13. In this design, the uppermost rotating filter 12 is fixed to the lifting cylinder 13, ensuring that the lifting cylinder 13 can lift the uppermost rotating filter 12 when it rises, and that the lifting cylinder 13 can rise and fall relative to the rotating filters 12 in other positions. When the hollow barrel 7 collects the crushed casting sand, the rotation of the lifting cylinder 13 causes several rotating filters 12 to rotate relative to the lifting filter 9 until the rotating filters 12 rotate to the lower surface of the lifting filter 9, ensuring that the falling casting sand can be smoothly accumulated in the hollow barrel 7 and fill the space between two adjacent rotating filters 12. After a certain amount of casting sand is collected in the hollow barrel 7, the rotation of the lifting cylinder 13 is used again to rotate the rotating filters 12 until they cover the lifting filter 9. In areas not covered by mesh 9, the hollow barrel 7 is divided into multiple layers using lifting mesh 9 and rotating mesh 12, simultaneously separating the casting sand gathered within the hollow barrel 7 into different layers. Connecting ropes 18 are attached to adjacent rotating meshes 12 near the lifting cylinder 13, with the lengths of the connecting ropes 18 increasing sequentially from top to bottom. An electric telescopic rod 15 extends inward from one side of the hollow barrel 7's opening and is fixedly connected to it. The telescopic end of the electric telescopic rod 15 is a ring-shaped arrangement fitted onto the central shaft 8, and its telescopic end is rotatably connected to the top of the lifting cylinder 13. After the space inside the hollow barrel 7 is divided into multiple layers by the lifting mesh 9 and rotating mesh 12, the lifting cylinder 13 rises by extending the electric telescopic rod 15. The cylinder 13 drives the uppermost rotating filter 12 to rise, and the interference of the rotating filter 12 pushes the lifting filter 9 above it to rise. Under the connection of the connecting rope 18, the other rotating filters 12 drive the corresponding lifting filters 9 to rise. Because the length of the connecting rope 18 increases from top to bottom, after several connecting ropes 18 are taut as the upper rotating filter 12 rises, the distance between two adjacent rotating filters 12 increases from top to bottom. This creates gaps between adjacent layers of casting sand after the hollow barrel 7 is layered, which can reduce the thickness of the casting sand and increase the contact area between the casting sand and the air. At this time, when the air circulates, it can pass through the casting sand in the middle area to achieve rapid cooling.

[0023] Additionally: Several ring-shaped limiting rods 11, arranged parallel to the central axis 8, are fixedly connected to the bottom edge of the hollow barrel 7. These limiting rods 11 pass through the sides of several lifting filter screens 9, and sleeves 10 are fixedly connected to the bottom edge of each lifting filter screen 9, fitted onto the limiting rods 11. The sleeves 10 ensure that the lifting filter screens 9 move as described above. Figure 3 In the state shown, the gaps between two adjacent gaps are equal, and the limit rod 11 ensures that the lifting filter 9 can only move up and down and cannot rotate. A toothed ring 14 is fixedly connected to the outer wall of the lifting cylinder 13 near the top. A motor 16 is fixedly connected to the surface of the upper lifting filter 9. A gear 17 for meshing with the toothed ring 14 is fixedly connected to the main shaft of the motor 16. The gear 17 is driven to rotate by the motor 16 to achieve meshing with the toothed ring 14 and drive the lifting cylinder 13 to rotate. This allows the lifting cylinder 13 to collect a certain amount of casting sand in the hollow barrel 7 and then use the rotating filter 12 to divide the space inside the hollow barrel 7. Then, the electric telescopic rod 15 is used to retract to make several rotating filters 12 rise to create gaps in the layered casting sand.

[0024] Additionally: the lifting filter screen 9 and the rotating filter screen 12 have an arc of not less than 180 degrees, and the outer side of the lifting filter screen 9 extends outward to a ring with the same center as the hollow barrel 7. The inner side of the lifting filter screen 9 is fitted with the outer wall of the lifting cylinder 13 with a gap. The inner side of the rotating filter screen 12 is used to cover the gap between the lifting filter screen 9 and the lifting cylinder 13, so as to ensure that the rotating filter screen 12 can form a partition with the lifting filter screen 9 to block the casting sand after rotating half a turn.

[0025] Additionally, it includes a stirring rod installed inside the crushing box 1. A baffle plate 4 is also installed inside the crushing box 1. Several baffle blocks 5 are fixedly connected to the upper surface of the baffle plate 4 and are slidably connected to the gap between two adjacent stirring rods inside the crushing box 1. The stirring rod is a prior art, and its structure and driving method refer to the stirring rod in the prior art proposed in the background art. The stirring rod is rotated to move the blocky casting sand poured into the crushing box 1. After moving past several baffle blocks 5, the crushing is achieved by the extrusion force and shear force generated by the relative movement of the baffle blocks 5 and the stirring rod.

[0026] Working principle: Used foundry sand is poured onto the surface of the baffle plate 4 through the opening at the top of the crushing box 1. The sand is then dispersed by the action of the stirring rod and the baffle block 5, falling through the baffle plate 4 into the perforated bucket 7. After a certain amount accumulates in the perforated bucket 7, the motor 16 drives the gear 17 to rotate, engaging the gear ring 14 to rotate the lifting cylinder 13. The rotation of the lifting cylinder 13 causes the rotating filter 12 to rotate, covering areas that the lifting filter 9 cannot reach. In other words, the lifting filter 9 and the rotating filter 12 divide the interior of the perforated bucket 7 into multiple layers. Meanwhile, the casting sand gathered in the hollow barrel 7 is separated into different layers. Then, the electric telescopic rod 15 retracts to raise the lifting cylinder 13, which in turn raises the uppermost rotating filter screen 12. Under the connection of several connecting ropes 18, several rotating filters 12 below it are raised in sequence, so that gaps are created between adjacent layers of casting sand after stratification in the hollow barrel 7. This can reduce the thickness of the casting sand and increase the contact area between the casting sand and the air. The fans 3 on both sides are started to realize the air circulation inside the hollow barrel 7, so as to achieve rapid cooling of the stratified casting sand.

[0027] The wiring diagrams of the electric telescopic pole 15, fan 3 and motor 16 in this utility model are common knowledge in the field. Their working principle is a well-known technology. The appropriate model is selected according to actual use. Therefore, the control method and wiring layout of the electric telescopic pole 15, fan 3 and motor 16 will not be explained in detail.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A sand-drying device for lost foam casting hammerheads, comprising a crushing box (1), characterized in that: The bottom of the grinding box (1) is provided with a collection box (2). The collection box (2) has two symmetrical ventilation openings (6) on its wall, and a fan (3) is provided inside the ventilation openings (6). The collection box (2) is provided with a hollow barrel (7). The bottom of the hollow barrel (7) is fixedly connected to a central shaft (8). A lifting cylinder (13) is sleeved on the central shaft (8). The outer wall of the lifting cylinder (13) is sleeved with several lifting filters (9) distributed from top to bottom and rising and falling along the depth direction of the hollow barrel (7). The hollow barrel (7) is arranged in a fan shape and has a rotating filter (12) inserted into the lifting cylinder (13) on its bottom surface. Two adjacent rotating filters (12) are connected to a connecting rope (18) near the lifting cylinder (13). The length of the connecting rope (18) distributed from top to bottom increases sequentially. The hollow barrel (7) extends inward on one side of its opening and is fixedly connected to an electric telescopic rod (15). The telescopic end of the electric telescopic rod (15) is a ring-shaped arrangement sleeved on the central shaft (8) and is rotatably connected to the top of the lifting cylinder (13).

2. The sand-drying equipment for lost foam casting hammerheads according to claim 1, characterized in that: The bottom edge of the hollow barrel (7) is fixedly connected with several limiting rods (11) arranged in a circular array and parallel to the central axis (8). The limiting rods (11) pass through the sides of several lifting filters (9) and the bottom edge of the lifting filters (9) is fixedly connected with a sleeve (10) sleeved on the limiting rods (11).

3. The sand-drying equipment for lost foam casting hammerheads according to claim 1, characterized in that: A gear ring (14) is fixedly connected to the outer wall of the lifting cylinder (13) near the top. A motor (16) is fixedly connected to the surface of the lifting filter (9) at the upper position. A gear (17) for meshing with the gear ring (14) is fixedly connected to the main shaft of the motor (16).

4. The sand-drying equipment for lost foam casting hammerheads according to claim 1, characterized in that: The lifting filter (9) and rotating filter (12) have an arc of not less than 180 degrees, and the outer edge of the lifting filter (9) extends outward to a ring-shaped arrangement with the same center as the hollow barrel (7).

5. The sand-drying equipment for lost foam casting hammerheads according to claim 4, characterized in that: The inner side of the lifting filter (9) is fitted with the outer wall of the lifting cylinder (13) with a gap, and the inner side of the rotating filter (12) is used to cover the gap between the lifting filter (9) and the lifting cylinder (13).

6. The sand-drying equipment for lost foam casting hammerheads according to claim 1, characterized in that: It also includes a stirring rod installed in the grinding box (1), and a baffle plate (4) is also installed in the grinding box (1). Several baffles (5) are fixedly connected to the upper surface of the baffle plate (4) and are slidably connected to the gap between two adjacent stirring rods in the grinding box (1).

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