CN219378897U - Elbow precoated sand shell mold - Google Patents

Abstract

The utility model particularly discloses an elbow precoated sand shell mold, which comprises a plurality of elbow shell mold units which are aligned up and down and are detachably connected, wherein each elbow shell mold unit comprises two elbow shell mold units which are symmetrically arranged, a plurality of exhaust grooves are formed in the end parts of the two ends of each elbow shell mold unit, and a direct casting pipeline for casting molten iron and an internal casting pipeline which is respectively communicated with the two elbow shell mold units are arranged between the two elbow shell mold units. According to the utility model, the exhaust groove is arranged on the bent pipe shell mold, so that gas generated by molten iron in the pouring process is conveniently discharged from the exhaust groove, thereby greatly reducing cold insulation defects at the port of the bent pipe, and solving the technical problem that the cold insulation defects appear on the surface of the bent pipe due to unsmooth exhaust in the pouring process in the prior art; meanwhile, based on detachable connection of a plurality of tube shell units, multilayer pouring of the bent tubes is realized, production efficiency is improved, and production cost is reduced.

Description

Elbow precoated sand shell mold

Technical Field

The utility model relates to the technical field of bent pipe casting, in particular to a bent pipe precoated sand shell mold.

Background

The bent pipe is a bent pipe, no matter which machine equipment and pipelines are used, and most of the bent pipe is widely used in the fields of oil transportation, gas transportation, transfusion, engineering bridge construction and the like, and the bent pipe is bent by adopting complete bending equipment and is divided into a cold stewing process and a hot pushing process. The precision of the bent pipe manufactured by the method is not high enough, so when part of the precision requirement on the bent pipe is high, a die is usually used for manufacturing the bent pipe; the precoated sand mold is one of the materials, and has the advantages of high strength, low gas emission, low expansion, good thermal stability, good thermal conductivity and the like, so that the precoated sand mold is widely used in the production process of bent pipes.

However, in the prior art, the bent pipe precoated sand shell mold has the following defects:

1. the size of the bent pipe is seriously out of tolerance because the sand shell mould of the bent pipe precoated is easy to deform;

2. in the casting process, cold insulation defects appear at the fracture of the bent pipe and on the surface of the bent pipe due to unsmooth exhaust of the sand shell mould of the bent pipe precoated;

3. the multi-layer casting cannot be realized, the product yield is low, and the production cost is high.

Disclosure of Invention

In order to solve the technical problems, the utility model provides an elbow precoated sand shell mold, which comprises a plurality of elbow shell mold units which are aligned up and down and are detachably connected, wherein each elbow shell mold unit comprises two elbow shell mold units which are symmetrically arranged, two end parts of each elbow shell mold unit are respectively provided with a plurality of exhaust grooves, and a direct casting pipeline for casting molten iron and an internal casting pipeline which is respectively communicated with the two elbow shell mold units are arranged between the two elbow shell mold units.

Preferably, each end of each bent pipe shell mold is provided with three exhaust grooves which are uniformly distributed in an annular shape.

Preferably, the side surface of each bent pipe shell mold is provided with a plurality of exhaust holes which are uniformly distributed.

Preferably, the side surface of each bent pipe shell mold is provided with five exhaust holes.

Preferably, a cutting groove is arranged at the inlet of each inner pouring pipeline.

Preferably, the bent pipe shell mold is provided with a plurality of reinforcing ribs.

Preferably, the pipe bending shell mould further comprises a sand shooting port, wherein the sand shooting port is positioned among the plurality of reinforcing ribs and used for enhancing the strength of the middle part of the pipe bending shell mould.

Compared with the prior art, the exhaust groove is formed in the bent pipe precoated sand shell mold, so that gas generated by molten iron in the pouring process is conveniently exhausted from the exhaust groove, the cold insulation defect at the port of the bent pipe is greatly reduced, and the technical problem that the cold insulation defect occurs on the surface of the bent pipe due to unsmooth exhaust in the pouring process in the prior art is solved; meanwhile, based on the detachable connection of a plurality of tube shell units, the multi-layer pouring of the bent tube is realized, the production efficiency is improved, and the production cost is reduced; in addition, the exhaust holes are arranged on the side surface of the bent pipe shell mold, so that gas in the bent pipe shell mold can be accelerated to overflow, and further the phenomenon that cold insulation defects are generated on the surface of the bent pipe is reduced; in addition, through setting up the sand mouth and setting up the cutting groove including the watering pipeline entry, strengthened the intensity of return bend shell mold middle part on the one hand, reduced the return bend shell mold and appear the phenomenon of deformation, on the other hand, the cutting groove can guarantee that the return bend can not take the meat when knocking out, has improved the qualification rate of return bend product.

Drawings

Figure 1 is a schematic structural view of a sand shell mold for pipe bending precoated sand in the present utility model,

fig. 2 is a schematic structural view of a bent pipe shell unit in the present utility model.

In the figure: 1. the pipe bending shell type die comprises a pipe bending shell type die body, an exhaust groove, a direct casting pipeline, an internal casting pipeline, an exhaust hole, a cutting groove and reinforcing ribs.

Detailed Description

The utility model will be described more fully hereinafter with reference to the accompanying drawings and the preferred embodiments for facilitating an understanding of the structure and method of operation of the utility model, but the scope of the utility model is not limited to the specific embodiments described. It should be noted that, under the condition of not affecting the use effect, the structural features and the sizes of the components in the embodiment of the utility model can be changed, the connection mode can be replaced, and the size of the device can be changed.

Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terms "first," "second," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to facilitate distinguishing between corresponding features. Also, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected" and the like are not limited to a direct connection, but may be indirectly connected through other intermediate connections. "above", "below", "one side", "the other side", "vertical", "lateral", etc. are used only to indicate a relative positional relationship, which changes when the absolute position of the object to be described changes accordingly.

As shown in fig. 1 and 2, the bent pipe precoated sand shell mold provided by the utility model comprises a plurality of bent pipe shell mold units which are aligned up and down and are detachably connected, each bent pipe shell mold unit comprises two bent pipe shell mold units 1 which are symmetrically arranged, two end parts of each bent pipe shell mold unit 1 are respectively provided with a plurality of exhaust grooves 2, and a direct casting pipeline 3 for casting molten iron and an internal casting pipeline 4 which is respectively communicated with the two bent pipe shell mold units 1 are arranged between the two bent pipe shell mold units 1.

In this embodiment, when the number of the bent-tube shell units is greater than or equal to 2, the straight pouring pipes 3 on two adjacent bent-tube shell units are all communicated, and the straight pouring pipe 3 on the lowest bent-tube shell unit can be set to a closed state at the lower end of the straight pouring pipe 3, so as to avoid the cast molten iron from directly leaking from the straight pouring pipe 3.

In this embodiment, each end of each bent pipe shell mold 1 is provided with three exhaust grooves 2 which are uniformly distributed, and through the exhaust grooves 2, gas generated by molten iron in the pouring process can be finally discharged through the exhaust grooves 2 at the junction of the port junction, so that the cold insulation defect at the bent pipe port is greatly reduced, and the technical problem of cold insulation defect at the bent pipe port caused by unsmooth exhaust in the pouring process in the prior art is solved; meanwhile, based on detachable connection of a plurality of tube shell units, multilayer pouring of the bent tubes is realized, production efficiency is improved, and production cost is reduced.

As shown in fig. 2, a plurality of exhaust holes 5 are uniformly distributed on the side surface of each bent pipe shell mold 1.

In this embodiment, 5 exhaust holes 5 are provided. Through evenly lay a plurality of exhaust hole 5 in return bend shell mould 1's side, can accelerate the overflow of return bend shell mould 1 intracavity gas based on exhaust hole 5 that set up, and then greatly reduced the return bend surface and produced the phenomenon of cold shut defect, improved the qualification rate of leaving the factory of return bend product.

As shown in fig. 2, a cutting groove 6 is arranged at the inlet of each inner casting pipe 4.

In this embodiment, through setting up cutting groove 6 in the entrance of watering pipeline 4, based on cutting groove 6 can guarantee that the return bend after the shaping does not take the meat in the breaking process, has further guaranteed the qualification rate of leaving the factory of return bend.

As shown in fig. 1 and 2, the bent pipe shell mold is provided with a plurality of reinforcing ribs 7.

In this embodiment, through set up a plurality of strengthening ribs 7 on return bend shell mould 1, and then strengthen return bend shell mould 1's intensity, effectively avoided return bend shell mould 1 to lead to return bend shell mould to produce the phenomenon of deformation because of the atress inequality when ejecting process, also improved the qualification rate of leaving the factory of return bend to a certain extent.

And the pipe bending shell mould further comprises a sand shooting port (not shown in the figure), wherein the sand shooting port is positioned among a plurality of reinforcing ribs 7 and used for enhancing the strength of the middle part of the pipe bending shell mould 1.

In the embodiment, the sand jet is arranged to effectively strengthen the strength of the middle area of the bent pipe shell mold 1, so that powerful guarantee is provided for the yield of bent pipes.

The utility model provides the bent pipe precoated sand shell mold and the combined structure thereof. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (7)

1. The utility model provides an return bend tectorial membrane sand shell mould, its characterized in that, including a plurality of alignment about and can dismantle return bend shell mould unit of connection, every return bend shell mould unit all includes two return bend shell mould (1) that the symmetry set up, and the both ends tip of every return bend shell mould (1) all is equipped with a plurality of exhaust duct (2), and is equipped with between two return bend shell mould (1) and is used for pouring molten iron directly watering pipeline (3) and interior watering pipeline (4) with two return bend shell mould (1) intercommunication respectively.

2. The pipe bending precoated sand shell mould according to claim 1, characterized in that each end of each pipe bending shell mould (1) is provided with three evenly annularly arranged exhaust slots (2).

3. The pipe bending precoated sand shell mold according to claim 1, characterized in that the side of each pipe bending shell mold (1) is provided with a plurality of evenly distributed exhaust holes (5).

4. A pipe bending precoated sand shell mould according to claim 3, characterized in that the side of each pipe bending shell mould (1) is provided with five exhaust holes (5).

5. The elbow precoated sand shell mold according to claim 1, wherein a cut-off groove (6) is provided at the inlet of each inner casting pipe (4).

6. The pipe bending precoated sand shell mold according to claim 1, characterized in that the pipe bending shell mold (1) is provided with a plurality of reinforcing ribs (7).

7. The pipe bending precoated sand shell mold according to claim 6, further comprising sand jetting openings, wherein the sand jetting openings are positioned among a plurality of reinforcing ribs (7) for enhancing the strength of the middle part of the pipe bending shell mold (1).