Large sand core hoisting device

Abstract

The utility model relates to a large sand core hoisting device. The large sand core hoisting device comprises a hoisting bracket, a hoisting ring, U-shaped square steel, a supporting steel plate and a hoisting belt, the hoisting support is composed of square steel, and 20-40 square holes are formed in the middle of the hoisting support. The lifting ring is arranged on the lifting bracket; the U-shaped square steel is arranged between the two pieces of square steel at the top of the hoisting bracket in a sliding manner; the number of the supporting steel plates is two, and the two supporting steel plates penetrate through the lower portion of the hoisting sand core and are distributed in an up-down cross shape. And the supporting steel plate is connected with the hoisting bracket through the hoisting belt. The utility model provides a hoisting device applied to a large sand core, which effectively solves the problems of breakage and unhooking easily occurring in the hoisting process of the large sand core, and has the advantages of reducing the breakage damage rate of the large sand core, reducing the economic loss caused by scrapping of the large sand core and guaranteeing the safety of field operation workers.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a device for safely lifting large sand cores. Background Technique

[0002] With the rapid development of the casting industry, 3D printing technology has been favored by major foundries. Its high production speed and precise printing dimensions have greatly reduced the casting difficulty of various complex products. Through a 3D printer, sand cores or semi-finished products can be directly printed, saving the production cycle of making models and molding.

[0003] At first, 3D printers were mainly used to print sand cores for some small and complex cast steel parts. As the structures of some large gas turbines, mining machines, and steam turbines become more and more complex, the demand for large 3D printed sand cores in foundries is also increasing. In recent years, with the continuous upgrading of 3D printers, their printing sizes have become larger and larger, and more and more products can be formed using 3D printing technology. However, with the increase in the size of printed sand cores, problems have also emerged. Since 3D printed sand cores cannot place core bones like traditional manual core boxes, their overall strength is not as good as that of sand cores made by hand. As the size of 3D printed sand cores increases, the weight of the sand cores also increases significantly, and this problem becomes more and more obvious.

[0004] Currently, the conventional lifting method is to pre-design lifting holes on large sand cores, insert lifting tools into the lifting holes, and perform three-point or four-point lifting. During the lifting process, in addition to gravity, the sand core is also subjected to the force of the lifting tool towards the center crane hook. The risk of the sand core breaking or unhooking is very high, and it is very easy to break from the middle part during the lifting process. Once a break occurs, the sand core is basically scrapped and cannot be used, causing economic losses and also posing a great safety hazard. While breaking through the 3D printing size problem, it is also necessary to break through the problem of safe and stable lifting. Therefore, it is self-evident to develop a tooling that can safely lift large 3D printed sand cores in terms of economy, demand, and necessity. Content of the Utility Model

[0005] Based on this, in view of the problems of breakage and unhooking that occur during the lifting of large sand cores, it is necessary to provide a lifting device for large sand cores.

[0006] A large sand core lifting device includes: a lifting support, a lifting ring, a U-shaped square steel, a support steel plate, and a lifting belt; the lifting support is composed of square steel, with 20-40 square holes formed in the middle; the lifting ring is arranged on the lifting support; the U-shaped square steel is slidably arranged between two square steels at the top of the lifting support; the number of support steel plates is 2, and the two support steel plates pass through below the lifted sand core and are arranged in a vertical cross shape; the support steel plate is connected to the lifting support through the lifting belt.

[0007] In one embodiment, a circular rib with a diameter of 20 mm - 40 mm is arranged diagonally along the square hole, which can increase the overall strength of the lifting bracket and ensure the stability of lifting large sand cores.

[0008] In one embodiment, the number of lifting rings is 4 - 8.

[0009] In one embodiment, 3 - 6 card slots are arranged at the top of the U - shaped square steel, and the width of the card slots is 70 - 120 mm. After lifting the lifting bracket, the lifting belt is hung in the card slots of the U - shaped square steel with adjusted positions. The design of the card slots can prevent the lifting belt from sliding on the U - shaped square steel during lifting and ensure the stability of lifting large sand cores.

[0010] In one embodiment, the gap between the two support steel plates is 50 - 100 mm, avoiding mutual force interference between the two support steel plates.

[0011] In one embodiment, the thickness of the support steel plate is 10 - 15 mm and the width is 200 - 300 mm, ensuring that the stress area of the support steel plate is sufficient.

[0012] In one embodiment, the total length of the support steel plate exceeds the length of the lifted sand core by 400 - 500 mm.

[0013] In one embodiment, two square grooves are designed at both ends of the support steel plate, which can prevent the lifting belt from sliding on the support steel plate during lifting and ensure the stability of lifting large sand cores.

[0014] The technical solution adopted by the present utility model can achieve the following beneficial effects:

[0015] The present utility model provides a lifting device applied to large sand cores, effectively solving the problems of easy fracture and hook detachment during the lifting process of large sand cores, and having the advantages of reducing the fracture damage rate of large sand cores, reducing the economic losses caused by the scrapping of large sand cores, and ensuring the safety of on - site operating workers. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the lifting bracket;

[0017] Figure 2 It is a schematic diagram of the support steel plate;

[0018] Figure 3 It is a schematic diagram of the sand core embedding hole;

[0019] Figure 4 It is a schematic diagram of sand core lifting.

[0020] Description of the Reference Numerals:

[0021] 1 - Lifting support, 2 - Hoisting ring, 3 - U-shaped square steel, 4 - Card slot, 5 - Support steel plate, 6 - Core insert hole, 7 - Lifting belt. Detailed implementation mode

[0022] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiment.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] An embodiment of the present utility model discloses a large core hoisting device, which is applied to the hoisting of large cores. During the hoisting process, the force directions of all lifting points are kept vertically upward, reducing the risk of core damage. The disclosed large core hoisting device includes: a lifting support, a hoisting ring, a U-shaped square steel, a support steel plate and a lifting belt.

[0026] Specifically, as Figures 1-4 shown, the lifting support 1 is composed of square steel, with 20 - 40 square holes formed in the middle; the hoisting ring 2 is arranged on the lifting support 1; the U-shaped square steel 3 is slidably arranged between the two square steels at the top of the lifting support 1; two support steel plates 5 pass through the insert holes 6 under the hoisted core and are arranged in a vertical cross shape; the support steel plate 5 is connected to the lifting support 1 through the lifting belt 7.

[0027] As Figure 1As shown in the figure, the lifting support 1 is composed of square steel. There are 20 - 40 square holes formed in the middle of the lifting support 1. Circular ribs with a diameter of 20mm - 40mm are designed along the diagonals in the formed square holes to increase the overall strength of the lifting support 1. Hoisting rings 2 are evenly arranged around the lifting support 1. The U-shaped square steel 3 is slidably arranged on the two square steels at the top of the lifting support 1. The inner width of the U-shaped square steel 3 matches the distance between the two square steels on the lifting support. After determining the position, the U-shaped square steel 3 is clamped on the two square steels. At the same time, there are 3 - 6 card slots 4 arranged at the top of the U-shaped square steel 3, and the width of each card slot 4 is 70 - 120mm. After lifting the lifting support 1, the lifting belt 7 is hung in the card slot 4 of the U-shaped square steel 3 with the adjusted position. The design of the card slot 4 can prevent the lifting belt 7 from sliding on the U-shaped square steel 3 during hoisting, ensuring the stability of the large sand core hoisting.

[0028] Furthermore, the designed inner width of the U-shaped square steel 3 is 3 - 4mm greater than the distance between the two square steels, ensuring that the U-shaped square steel 3 can be smoothly clamped on the square steel of the lifting support 1, and while ensuring the adjustable position of the U-shaped square steel 3, it does not sway left and right.

[0029] Furthermore, multiple U-shaped square steels 3 can be set according to the hoisting requirements.

[0030] Furthermore, the number of hoisting rings 2 can be evenly set to 4 - 8 around the lifting support 1 according to the size of the sand core to ensure the stability of the hoisting process and the balance of the large sand core during hoisting.

[0031] Before hoisting the large sand core, first hang the overhead crane hook on the hoisting rings 2 around the lifting support 1, lift the lifting support 1, adjust the position of the U-shaped square steel 3 on the lifting support 1 according to the position of the hoisting holes on the sand core, clamp the lifting belt 7 on the card slot 4 of the U-shaped square steel 3, and lift the sand core through the lifting support 1. This method can make the force received by the sand core during hoisting be a vertically upward force, greatly reducing the damage to the sand core caused by the force in the central direction received by all the hooks when directly hoisting the sand core with the overhead crane.

[0032] For the hoisting of some large sand cores, relying solely on the above scheme is still not safe enough. The self-weight of this kind of sand core is too large, and the pressure is all borne on the four hook parts, with a certain hoisting risk. Therefore, in this embodiment, while using the hoisting support disclosed in the above embodiment, a bottom support steel plate 5 for the sand core and a lifting belt 7 connecting the bottom support steel plate 5 and the lifting support 1 are added to share the pressure on the hook part of the sand core through the support steel plate 5.

[0033] Specifically, as Figures 2-4As shown in the figure, to implement this embodiment, it is necessary to pre-design an inlaid hole 6 below the sand core. The inlaid hole 6 is usually set at a position near the bottom of the sand core, and the distance from the bottom of the sand core does not exceed 300 mm to ensure that most of the gravity of the sand core acts on the support steel plate 5. The inlaid hole 6 is drilled through along the length direction to ensure that the support steel plate 5 can pass through from the other end. The thickness of the inlaid hole 6 is designed to be 2-3 mm thicker than the support steel plate 5 to leave a certain gap to avoid difficulties in the passage of the support steel plate 5. In this embodiment, 2 support steel plates 5 are provided. To ensure the strength of the support steel plate 5 and the convenience of the embedding operation, the thickness of the support steel plate 5 is designed to be 10-15 mm, and the width is designed to be 200-300 mm. Two square grooves are designed at both ends of the support steel plate 5 to prevent the lifting belt 7 from sliding on the support steel plate 5 during lifting and ensure the stability of the lifting of the large sand core. The length of the support steel plate 5 is designed to exceed the length of the sand core, usually 400-500 mm longer in total, to ensure that the lifting belt 7 can be smoothly hung in the square grooves at both ends of the support steel plate 5. The 2 support steel plates 5 pass through the inlaid holes 6 below the sand core and are arranged in a vertical cross shape. The gap between the two support steel plates 5 above and below is 50-100 mm to avoid mutual force interference.

[0034] Furthermore, the cross-shaped arrangement of the 2 support steel plates 5 is not a regular cross shape. Specifically, it needs to be adjusted according to the positions of the four lifting points to ensure that each support steel plate 5 can hang two lifting belts 7.

[0035] It should be noted that the number of lifting points of the large sand core is usually set to no less than 4, and the number of support steel plates 5 can be adjusted according to the number of lifting points. The 2 support steel plates 5 disclosed in this embodiment are the minimum set number.

[0036] During the lifting process of the large sand core, first, the lifting bracket 1 is lifted to the upper part of the large sand core to be lifted through the lifting ring 2. The U-shaped square steel 3 on the lifting bracket 1 is adjusted to be directly above each lifting point of the large sand core. The lifting belt 7 is passed through the lifting device and then bypassed the U-shaped square steel 4 on the lifting bracket 1. The lifting belt 7 is stuck in the top card slot 4 of the U-shaped square steel 3. After all the internal lifting points are hung, the support steel plates 5 are sequentially embedded into the steel plate inlaid holes 6 at the lower part of the sand core. One end of the lifting belt 7 is hung on the lifting bracket 1 along the outer edge, and the other end is hung in the square grooves at both ends of the support steel plate 5. After all the lifting points are set and installed, the sand core is lifted as a whole through the lifting bracket 1 to complete the lifting of the large sand core.

[0037] At present, some large sand cores on site are hoisted by the hoisting device disclosed in this solution. The fracture and damage rate of the sand cores has been significantly reduced, not only greatly reducing the economic losses caused by the scrapping of sand cores, but more importantly, ensuring the safety of on-site operators. At the same time, the technical solution proposed in this solution makes the stress directions of all lifting points of the large sand core vertically upward, and the operation method is relatively simple, greatly reducing the risk of sand core damage. At the same time, the method of inlaying the support steel plate 5 inside the large sand core is relatively simple to verify in operation on site. The weight of the support steel plate 5 can be easily carried by a single worker, and the process of inserting the support steel plate 5 into the inlay hole 6 of the sand core is unobstructed. This hoisting device is simple and effective.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0039] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A large-sized core lifting device, characterized in that The core lifting device includes: a lifting bracket, a lifting ring, a U-shaped square steel, a support steel plate and a lifting belt; The lifting bracket is composed of square steel, with 20-40 square holes formed in the middle; The lifting ring is arranged on the lifting bracket; The U-shaped square steel is slidably arranged between two square steels at the top of the lifting bracket; The number of the support steel plates is 2, and the 2 support steel plates pass through the lower part of the lifted core and are arranged in a vertical cross shape; The support steel plate is connected to the lifting bracket through the lifting belt.

2. The core lifting device according to claim 1, wherein, Circular ribs with a diameter of 20mm-40mm are arranged along the diagonal of the square hole.

3. The core lifting device according to claim 1, characterized in that, The number of the lifting rings is 4-8.

4. The core lifting device according to claim 1, characterized in that, 3-6 card slots are arranged at the top of the U-shaped square steel, and the width of the card slots is 70-120mm.

5. The core lifting device according to claim 1, wherein, The gap between the upper and lower parts of the 2 support steel plates is 50-100mm.

6. The core lifting device according to claim 1, wherein The thickness of the support steel plate is 10-15mm, and the width is 200-300mm.

7. The core hoisting device according to claim 1, characterized in that The total length of the support steel plate exceeds the length of the lifted core by 400-500mm.

8. The core lifting device according to claim 1, wherein, Two square grooves are designed at both ends of the support steel plate.

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