One-box double-core sand shooting head improvement device of nodular cast iron pipe fitting core making core box

Abstract

The utility model discloses a nodular cast iron pipe fitting core-making core box one-box double-core sand shooting head improvement device which comprises a core-making core box and an inner cavity part of the core-making core box, and two inner cavities, namely a core box inner cavity I and a core box inner cavity II, are arranged in the core-making core box; core-pulling rods, namely a core-pulling rod I and a core-pulling rod II, are respectively arranged in the inner cavities of the two core boxes; the top of the inner cavity of each core box is provided with a sand shooting port component, namely a sand shooting port I and a sand shooting port II, which are inlets for sand grains to enter the core box during core making and sand shooting; the core-making core box comprises a core box sand shooting surface, the sand shooting port component is arranged on the core box sand shooting surface, and in addition, a plurality of positioning sleeves are further arranged on the core box sand shooting surface and used for positioning the core box, the sand shooting plate and the ammonia blowing plate and preventing the sand shooting plate and the ammonia blowing plate from deviating. The original trumpet-shaped core box sand shooting ports are easily blocked by burnt-on sand, and the weight of the core head of the sand core is reduced and the overall quality of the sand core is improved by optimizing the number and the shape of the sand shooting ports.

Description

Technical Field

[0001] This utility model relates to the field of sand-shooting head technology, specifically an improved device for a dual-core sand-shooting head with a core box for ductile iron pipe fittings. Background Technology

[0002] Ductile iron pipe fittings are an important component connecting ductile iron pipes. Ductile iron pipe fittings possess the essence of iron and the performance of steel, with excellent corrosion resistance, good ductility, good sealing effect, and easy installation. They are mainly used for water supply, gas transmission, and oil transmission in municipal and industrial enterprises, and have a high cost-performance ratio. During the manufacturing process, ductile iron pipe fittings require the use of sand cores to form the inner cavity of the pipe fittings.

[0003] In terms of quality, ductile iron pipe fittings require a spheroidization grade of 1-3 with a spheroidization rate greater than 80%, thus significantly improving the material's mechanical properties. It possesses the essence of iron and the performance of steel. Its microstructure consists of ferrite with a small amount of pearlite, exhibiting good mechanical properties, excellent corrosion resistance, good ductility, good sealing performance, and easy installation. It is mainly used for water supply, gas transmission, and oil transportation in municipal and industrial enterprises.

[0004] Core-making machines, as an important piece of equipment in the foundry industry, are used to manufacture sand cores for casting, shaping them to meet the required internal cavity contours of the casting. The core box sand injection head is the inlet for the core sand to enter the core cavity. The size of the injection nozzle affects the process yield of the sand core. Reducing the size of the core box sand injection head can increase the process yield of the core sand, reduce waste, and save production costs. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an improved device for a single-box double-core sand injection head for core making of ductile iron pipe fittings. This device solves the problems in existing technologies where the sand injection port of the core box is designed in a trumpet shape, requiring one sand injection port to simultaneously access both core cavities of the core box; and where the large size of the sand injection port leads to increased sand injection resistance, prolonged hardening time, and poor sand core quality.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: an improved device for a core-making box with a double-core sand-shooting head for ductile iron pipe fittings, comprising a core-making box and its inner cavity, wherein the core-making box has two inner cavities, namely core box inner cavity one and core box inner cavity two; core-pulling rods, namely core-pulling rod one and core-pulling rod two, are respectively equipped in the two core box inner cavities; a sand-shooting port component, namely sand-shooting port one and sand-shooting port two, is provided at the top of each core box inner cavity, which is the entrance for sand particles to enter the core box during core-making sand-shooting;

[0009] The core-making box includes a core-box sand-shooting surface, and a sand-shooting port component is disposed on the core-box sand-shooting surface. In addition, multiple positioning sleeves are also provided on the core-box sand-shooting surface to prevent the sand-shooting plate and the ammonia blowing plate from shifting during core-making sand-shooting and ammonia blowing.

[0010] Preferably, the two sand-shooting nozzle components are oval in shape, with rounded corners on both sides having a radius of 17.5 mm and a length of 10 mm in the middle.

[0011] Preferably, four positioning sleeves are configured, which are positioned corresponding to the positioning pins of the core-making machine's sand-shooting plate and ammonia-blowing plate to prevent the sand-shooting plate and ammonia-blowing plate from shifting.

[0012] Preferably, the height of the core box sand-shooting surface is 20mm. After removing 99mm from the sand-shooting nozzle end of the original core box (the original design core box sand-shooting head height is 119mm), a 20mm thick steel plate is inserted. The dimensions of the sand-shooting nozzle component are 45mm x 35mm x 40mm (length x width x height).

[0013] Preferably, the weight of each sand core at the sand injection port is 0.2 kg.

[0014] (III) Beneficial Effects

[0015] This utility model provides an improved device for a single-box, dual-core sand-shooting head for core-making of ductile iron pipe fittings. It offers the following advantages: The original funnel-shaped core box sand-shooting nozzle was prone to sand adhesion and clogging. Through a series of experiments, the original design of the core box sand-shooting nozzle shape (one nozzle at the top branching into two nozzles leading to the two core cavities of the core box) was improved, resulting in a relatively high nozzle height. By reducing the core box height and replacing it with two small, waist-shaped nozzles, the nozzles correspond one-to-one with the core cavities, preventing interference between sand-shooting and ammonia blowing in the two core cavities.

[0016] By optimizing the number and shape of the sand injection nozzles, the weight of the sand core head is reduced and the overall quality of the sand core is improved. The single large sand injection nozzle is replaced with two small sand injection nozzles, thereby reducing the weight of the sand injection head. The sand core injection head is 1.2 kg lighter than before, which increases the yield of the core making process, reduces the waste of sand cores, and improves the quality of sand cores.

[0017] While reducing the size of the sand-shooting head, the two core cavities of the core box do not interfere with each other during sand-shooting and ammonia blowing in the core-making process. A positioning device is added between them. During core-making, the sand-shooting and ammonia blowing paths are shortened, and the core-making sand-shooting and hardening cycle is shortened by about 10 seconds. This effectively avoids the deviation of the sand-shooting port of the sand-shooting plate, the ammonia blowing port of the ammonia blowing plate, and the sand-shooting port of the core box during operation, ensuring the accuracy and stability of the process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural model of this utility model;

[0019] Figure 2 This is a schematic diagram of the structural model dimensions of this utility model;

[0020] Figure 3 This is a simplified top view of the positioning sleeve for the core box of this utility model.

[0021] In the diagram: 1. Sand injection port one; 11. Core box inner cavity one; 12. Core pulling rod one; 2. Sand injection port two; 22. Core box inner cavity two; 23. Core pulling rod two; 3. Core box sand injection surface; 31. Positioning sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0023] Please see Figure 1-2 This utility model provides a technical solution:

[0024] An improved device for a core-making box with a double-core sand-shooting head for ductile iron pipe fittings includes a core-making box and its inner cavity. The core-making box has two inner cavities, namely core box inner cavity one 11 and core box inner cavity two 21. Core-pulling rods, namely core-pulling rod one 12 and core-pulling rod two 22, are respectively provided in the two core box inner cavities. Sand-shooting port components, namely sand-shooting port one 1 and sand-shooting port two 2, are provided at the top of each core box inner cavity, which are the inlets for sand particles to enter the core box during core-making sand-shooting.

[0025] The core box includes a core box sand injection surface 3, and a sand injection port component is set on the core box sand injection surface 3. In addition, multiple positioning sleeves 31 are also provided on the core box sand injection surface 3 to prevent the sand injection plate and the ammonia blowing plate from shifting during core injection and ammonia blowing.

[0026] The two sand-shooting nozzle components are oval in shape, with rounded corners on both sides having a radius of 17.5mm and a length of 10mm in the middle.

[0027] The positioning sleeve 31 is configured with four pieces, which are positioned corresponding to the positioning pins of the core-making machine's sand-shooting plate and ammonia-blowing plate to prevent the sand-shooting plate and ammonia-blowing plate from shifting.

[0028] The core box sandblasting surface 3 is 20mm high. After removing 99mm from the sandblasting nozzle end of the original core box (the original design core box sandblasting head height is 119mm), an insert is made and a 20mm thick steel plate is inserted. The dimensions of the sandblasting nozzle component are 45mm x 35mm x 40mm (length x width x height).

[0029] Each sand core from the sand injection port weighs 0.2 kg.

[0030] In this example, during operation, the sand particles enter through the sand injection port during core making. Due to the improved design, the original sand injection port was oval-shaped, with dimensions of 130mm x 60mm. The sand injection diameter inside the core box is... The nozzle height of 119mm and the nozzle weight of 1.6kg have been adjusted.

[0031] Two oval-shaped sand-shooting nozzles were redesigned, and the new core box sand-shooting surface was lowered to 20mm in height. The original core box (the original design had a sand-shooting head height of 119mm) had 99mm removed from the sand-shooting nozzle end and then fitted with an insert. A 20mm thick steel plate was inserted into this position. The new sand-shooting nozzle dimensions were 45mm x 35mm x 40mm (length x width x height), and the sand core weight of each sand-shooting nozzle was 0.2kg. Subsequently, four positioning sleeves were made on the core box sand-shooting surface to correspond with the positioning pins of the core-making machine's sand-shooting plate and ammonia blowing plate. This ensured that the sand-shooting nozzles of the core-making machine's sand-shooting plate and the ammonia blowing plate were aligned with the core box sand-shooting nozzles, preventing the sand-shooting plate and ammonia blowing plate from shifting.

[0032] When casting parts with internal cavities, the core-pulling rod can assist in core making. When the mold is opened, the sand core is fixed on the core-pulling base, so that the sand core is emptied and the weight of the sand core is reduced. After demolding, the residual core sand, resin and other impurities in the core box should be cleaned in time, and the core sand attached to it should be removed to keep the equipment clean for the next core making operation.

[0033] In summary, after the core box was modified according to the design scheme, the weight of the core head was reduced and the overall quality of the core was improved by optimizing the number and shape of the sand injection nozzles. The single large sand injection nozzle was changed to two small sand injection nozzles, thereby reducing the weight of the sand injection head. The sand core injection head was 1.2 kg lighter than before, which improved the yield of the core making process, reduced the waste of sand cores, and improved the quality of the sand cores.

[0034] While reducing the size of the sand-shooting head, the sand-shooting nozzle corresponds one-to-one with the core cavity of the core box. During the core-making process, the two core cavities of the core box do not interfere with each other when sand-shooting and ammonia blowing occur. A positioning device is added between them. During core-making, the sand-shooting and ammonia blowing paths are shortened, and the core-making sand-shooting and hardening cycle is shortened by about 10 seconds. This effectively avoids the misalignment of the sand-shooting nozzle of the sand-shooting plate, the ammonia blowing nozzle of the ammonia blowing plate, and the sand-shooting nozzle of the core box during operation, ensuring the accuracy and stability of the process.

[0035] The single large sand injection port was replaced with two small sand injection ports, thereby reducing the weight of the sand injection head. The sand core injection head is 1.2kg lighter than before, which improves the yield of the core making process, reduces sand core waste, and improves the quality of the sand core.

[0036] While reducing the size of the sand-shooting head, the two core cavities of the core box do not interfere with each other during sand-shooting and ammonia blowing in the core-making process. A positioning device is added between them. During core-making, the sand-shooting and ammonia blowing paths are shortened, and the core-making sand-shooting and hardening cycle is shortened by about 10 seconds. This effectively avoids deviation during operation and ensures the accuracy and stability of the process.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved device for a two core sand shooting head for a core making core box, comprising a core making core box and a core cavity portion thereof, characterized by: The core-making core box is provided with two inner cavities, namely core box inner cavity one (11) and core box inner cavity two (21). In the two inner cavities, core pullers, namely core puller one (12) and core puller two (22) are respectively arranged. The top of each inner cavity is provided with sand shooting port components, namely sand shooting port one (1) and sand shooting port two (2), which are the entrances of the sand particles into the core box during core shooting. The core-making core box comprises a core box sand shooting surface (3), and the sand shooting port components are arranged on the core box sand shooting surface (3). In addition, a plurality of positioning sleeves (31) are arranged on the core box sand shooting surface (3) to prevent the shooting plate and the ammonia blowing plate from deviating during core shooting and ammonia blowing.

2. The improved device for a two-core sand shooting head of a core box for a nodular cast iron pipe fitting core according to claim 1, characterized in that: The two sand shooting port components are waist-round-shaped, and the two sides of each component are provided with a fillet with a radius of 17.5 mm, and the middle part is 10 mm long.

3. The improved device for a two core sand shooting head of a core box for a nodular cast iron pipe fitting core according to claim 1, characterized in that: The four positioning sleeves (31) are arranged to correspond to the positioning pins of the shooting plate and the ammonia blowing plate of the core-making machine to prevent the shooting plate and the ammonia blowing plate from deviating.

4. The improved device for a two core sand shooting head for a core box for a ductile iron pipe fitting core according to claim 1, wherein: The height of the core box sand shooting surface (3) is 20 mm, and after removing 99 mm from the original core box sand shooting port end, an inlay block treatment is performed, and a 20 mm thick steel plate is inlaid. The size of the sand shooting port component is 45 mm x 35 mm x 40 mm.

5. The improved device for a two core sand shooting head for a core box for a ductile iron pipe fitting core according to claim 1, wherein: The weight of each sand shooting port sand core is 0.2 kg.

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