Nodular cast iron welding flange pipe fitting mounting hole sand core and transfer support thereof

Abstract

The utility model discloses a nodular cast iron welding flange pipe fitting mounting hole sand core and a transfer support thereof, which comprise a hole forming part, an upper limiting part and a lower mounting part, the upper limiting part and the hole forming part are integrally formed, the upper limiting part is positioned at the top of the hole forming part, the lower mounting part is positioned at the bottom of the hole forming part, and the diameter of the hole forming part is 0.1-0.2 mm larger than that of a mounting hole. The lower mounting part is of a conical structure, and the diameter of the lower mounting part is gradually reduced from top to bottom; the forming sand core is provided with the upper limiting part, the hole forming part and the lower mounting part, the diameter of the hole forming part is 0.1-0.2 mm larger than that of the mounting hole, the mounting hole can be conveniently formed after molten iron shrinks, the lower mounting part is of a conical structure and can be conveniently matched with a transfer support, the forming sand core is restrained, the forming sand core is prevented from being damaged, and the production efficiency is improved. And the formed hole polishing workload is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical casting and forming mold parts, and particularly relates to a ductile iron welding flange pipe installation hole sand core and a transfer bracket thereof which can avoid the ductile iron welding flange sand core from being damaged by collision. Background Art

[0002] The ductile iron pipe industry in my country started in the early 1990s and has developed rapidly with the strong support of the China Urban Water Supply Association. After nearly 30 years of practical use, its safety and practicality have been generally recognized by the water supply industry. In 2008, the domestic annual output reached 2.2 million tons, 11 times that of 1990. Since my country is a country with scarce water resources, there are a large number of water-deficient cities and cities with severe water shortages, and the water supply and water-saving business is in the ascendant, ductile iron pipes have broad development prospects.

[0003] The welded flange is one of the important parts for connecting pipelines. It is welded at the interface of the pipeline, which can effectively reduce the leakage problem in the pipeline system. At the same time, during the operation of the equipment, the use of welded flanges can improve the stability of the equipment, reduce equipment damage and downtime, and thus reduce the cost of equipment maintenance.

[0004] There are many types of welding flanges with different nominal diameters and nominal pressures. The welding flanges produced by our company include DN40 to DN450. Among them, the mounting holes of DN40-DN250 welding flanges are processed later, while the mounting holes of DN300, N350, DN400 and DN450 welding flanges are required to be cast together on the blank; as follows Figure 1 The right side of the figure shows a welding flange 300 with 12 φ28mm mounting holes that require direct casting. At present, our company uses wooden pallets to transport sand cores from the core making workshop to the molding workshop. The welding flange sand cores are small in size and easily broken in bumpy conditions, making them inconvenient to transport on pallets. If the sand cores are placed one by one on the wooden pallet, the diameter of the sand cores cannot be guaranteed to be complete. Incomplete sand cores will result in more holes in the mounting holes, which will cause a lot of work for cleaning. Therefore, it is necessary to design a device that can facilitate the placement of welding flange sand cores and facilitate transportation. Summary of the invention

[0005] The utility model provides a ductile iron welded flange pipe fitting installation hole sand core and a transfer bracket thereof. The ductile iron welded flange pipe fitting installation hole sand core is formed by arranging the molding sand core into an upper limit portion, a hole molding portion and a lower installation portion, wherein the diameter of the hole molding portion is 0.1-0.2mm larger than the diameter of the installation hole, so as to facilitate the molding of the installation hole after the molten iron shrinks. The lower installation portion adopts a conical structure, which is convenient for cooperation with the transfer bracket to realize the constraint of the molding sand core, avoid damage to the molding sand core, and reduce the workload of grinding the forming hole.

[0006] In order to solve the above technical problems, the utility model discloses a sand core for a ductile iron welded flange pipe fitting installation hole, comprising a hole forming part, an upper limit part integrally formed with the hole forming part and located at the top of the hole forming part, and a lower mounting part located at the bottom of the hole forming part. The diameter of the hole forming part is 0.1-0.2 mm larger than the aperture size of the installation hole, and the lower mounting part is arranged as a conical structure and its diameter gradually decreases from top to bottom.

[0007] Furthermore, the upper limit portion is set to be cylindrical, the diameter of the upper limit portion is 1 / 2 to 2 / 3 of the diameter of the hole forming portion, and an arc-shaped transition portion connected to the upper limit portion is provided at the top of the hole forming portion near the circumference.

[0008] Furthermore, it comprises a support plate and a support foot arranged at the bottom of the support plate, and the support plate is evenly provided with conical receiving holes adapted to the lower mounting part of the sand core of the ductile iron welding flange pipe installation hole.

[0009] Furthermore, the support plate includes an upper support plate and a lower support plate, support blocks are evenly distributed between the upper support plate and the lower support plate near the edge, and the conical accommodating hole runs through the upper support plate and the lower support plate.

[0010] Furthermore, the height of the support foot and the support plate is greater than the height of the sand core of the ductile iron welding flange pipe fitting installation hole.

[0011] Furthermore, the support plate is configured as a square structure, L-shaped limit blocks are provided on the upper support plate near the four corners, and limit grooves adapted to the L-shaped limit blocks are provided on the outer wall of the support foot.

[0012] Furthermore, the support blocks are arranged at the four corners and the middle parts of the four sides of the upper support plate and the lower support plate.

[0013] The beneficial effects of the utility model are:

[0014] The utility model discloses a ductile iron welding flange pipe fitting installation hole sand core, which sets the molding sand core as an upper limit part, a hole molding part and a lower installation part, wherein the diameter of the hole molding part is 0.1-0.2mm larger than the diameter of the installation hole, so as to facilitate the molding of the installation hole after the molten iron shrinks. The lower installation part adopts a conical structure, which is convenient for cooperation with the transfer bracket. The transfer bracket constrains the molding sand core to avoid damage to the molding sand core, solves the problems of integrity and transportation of small sand cores of welding flanges, reduces the defects of excess meat and lack of meat in the installation holes of welding flanges, reduces the workload of grinding, and reduces the production cost of welding flanges. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the structure of an existing welding flange;

[0016] FIG2 is a schematic diagram of the structure of the sand core of the installation hole of the ductile iron welding flange pipe fitting of the utility model;

[0017] FIG3 is a diagram showing the use state of the sand core transfer bracket of the ductile iron welding flange pipe fitting installation hole of the utility model;

[0018] 4 is a side view of the use state of the sand core transfer bracket of the utility model for the installation hole of the ductile iron welding flange pipe fitting;

[0019] 5 is a schematic structural diagram of the utility model ductile iron welding flange pipe installation hole sand core transport bracket;

[0020] 6 is a side view of the sand core transfer bracket for the installation hole of the ductile iron welding flange pipe fitting of the present invention.

[0021] Figure markings: 1-welding flange; 2-mounting hole; 3-molding sand core; 4-upper positioning portion; 5-lower mounting portion; 6-hole forming portion; 7-tray; 8-transfer bracket; 9-upper plate body; 10-lower plate body; 11-conical accommodating hole; 12-support foot; 13-L-shaped limit block; 14-support block; 15-limiting groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] like Figure 2-6 This is a structural schematic diagram of a ductile iron welded flange pipe fitting installation hole sand core and its transfer bracket proposed by the utility model. The utility model provides a ductile iron welded flange pipe fitting installation hole sand core, including a hole forming part 6 and an upper limit part 4 integrally formed with the hole forming part 6 and located at the top of the hole forming part, and a lower mounting part 5 located at the bottom of the hole forming part. The diameter of the hole forming part is 0.1-0.2mm larger than the aperture size of the mounting hole, and the lower mounting part 5 is set to a conical structure and its diameter gradually decreases from top to bottom.

[0024] Taking the four types of welding flange 1 mounting holes of DN300, N350, DN400 and DN450 as examples, the casting molding requires that 12 mounting holes 2 with a diameter A of φ28 mm be cast on the blank. Due to the shrinkage of molten iron, the diameter B of the forming sand core 3 hole forming part 6 is set to φ28.2 mm, and the length of the forming sand core is 60-70 mm. During the transportation process, the forming sand core 3 hole forming part 6 is easily damaged, and a transportation bracket 8 is required to restrain it.

[0025] In this embodiment, the molding sand core 3 is configured as an upper limit portion, a hole forming portion and a lower mounting portion. The upper limit portion and the lower mounting portion facilitate installation of the molding sand core 3 in the casting mold and facilitate molding of the mounting hole of the welding flange 1. The diameter of the hole forming portion is 0.1-0.2mm larger than the diameter of the mounting hole, which facilitates molding of the mounting hole after the molten iron shrinks. The lower mounting portion adopts a conical structure, which is convenient for cooperation with the transfer bracket to realize constraint of the molding sand core 3, avoid damage to the molding sand core, and reduce the workload of grinding the forming hole.

[0026] In a preferred embodiment, the upper limit portion 4 is set to be cylindrical, and the diameter of the upper limit portion 4 is 1 / 2 to 2 / 3 of the diameter of the hole forming portion. An arc-shaped transition portion connected to the upper limit portion 4 is provided near the circumference at the top of the hole forming portion 6. This structure facilitates the integrated molding of the sand core 3.

[0027] A preferred embodiment includes a support plate and a support foot 12 arranged at the bottom of the support plate, and conical receiving holes 11 adapted to the lower mounting portion 5 of the molding sand core 3 are evenly distributed on the support plate. This embodiment utilizes the conical receiving holes 11 to constrain the lower mounting portion 5 of the molding sand core 3 to avoid damage to the molding sand core 3 during transportation.

[0028] In a preferred embodiment, the support plate includes an upper support plate 9 and a lower support plate 10, and support blocks 14 are evenly distributed between the upper support plate 9 and the lower support plate 10 near the edge. The conical receiving hole 11 passes through the upper support plate 9 and the lower support plate 10. The structure of this embodiment utilizes the upper support plate 9, the lower support plate 10 and the support block 14 structure, which is beneficial to reduce the weight of the support plate and facilitate transportation.

[0029] In a preferred embodiment, the height of the support legs 12 and the support plate is greater than the height of the molding sand core 3. This structure facilitates the stacking of the transfer bracket 8 in the height direction, so that the pallet 7 can transfer 3-4 layers of transfer diameter at one time.

[0030] In a preferred embodiment, the support plate is arranged as a square structure, L-shaped limit blocks 13 are arranged on the upper support plate 9 near the four corners, and limit grooves 15 adapted to the L-shaped limit blocks are arranged on the outer wall of the supporting foot. In this embodiment, the size of the pallet 7 is set to 1260x1200mm, and the design outline of the transfer bracket 8 is set to 570x570mm. In order to reduce the weight of the transfer bracket 8, a wooden bracket can be used, and the L-shaped limit blocks 13 and the limit grooves 15 are used to facilitate the placement of multiple layers of transfer brackets on the pallet for transfer operations. When making the welding flange sand core, the sand cores are placed one by one in the sand core bracket hole. When the holes on the bracket are used up, the bracket is placed on the pallet for transfer.

[0031] In a preferred embodiment, the support blocks 14 are arranged at the four corners and the middle of the four sides of the upper support plate 9 and the lower support plate 10. In this embodiment, the upper support plate 9 and the lower support plate 10 are made of 10-12 mm wooden boards, and the support blocks 14 are set to 30 mm. While ensuring the strength of the transfer bracket, it is beneficial to reduce the weight of the transfer bracket, reduce the labor intensity of sand core transportation, facilitate the transfer of a large number of molded sand cores, and greatly save production costs.

[0032] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A sand core for a ductile iron welded flange pipe fitting installation hole, characterized in that: It includes a hole forming part, an upper limit part which is integrally formed with the hole forming part and located at the top of the hole forming part, and a lower mounting part which is located at the bottom of the hole forming part. The diameter of the hole forming part is 0.1-0.2mm larger than the aperture size of the mounting hole. The lower mounting part is arranged as a conical structure and its diameter gradually decreases from top to bottom.

2. A ductile iron welding flange pipe installation hole sand core according to claim 1, characterized in that: The upper limit portion is set to be cylindrical, and the diameter of the upper limit portion is 1 / 2 to 2 / 3 of the diameter of the hole forming portion. An arc-shaped transition portion connected to the upper limit portion is arranged near the circumference at the top of the hole forming portion.

3. A sand core transport bracket for ductile iron welding flange pipe installation holes according to claim 1 or 2, characterized in that: The utility model comprises a support plate and a support foot arranged at the bottom of the support plate, wherein the support plate is evenly provided with conical receiving holes adapted to the lower mounting part of the sand core of the mounting hole of the ductile iron welding flange pipe fitting.

4. The transport bracket according to claim 3, characterized in that: The support plate comprises an upper support plate and a lower support plate, support blocks are evenly distributed between the upper support plate and the lower support plate near the edge, and the conical accommodating hole runs through the upper support plate and the lower support plate.

5. The transport bracket according to claim 4, characterized in that: The heights of the support legs and the support plates are greater than the height of the sand core of the ductile iron welding flange pipe fitting installation hole.

6. The transport bracket according to claim 5, characterized in that: The support plate is configured as a square structure, L-shaped limit blocks are provided on the upper support plate near the four corners, and limit grooves adapted to the L-shaped limit blocks are provided on the outer wall of the support foot.

7. The transport bracket according to claim 6, characterized in that: The support blocks are arranged at the four corners and the middle parts of the four sides of the upper support plate and the lower support plate.

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