A filter screen lap joint structure for casting

Abstract

The utility model relates to a filter screen lap joint structure for casting, and relates to the casting technical field; the upper side of sand mould is provided with rectangle groove body, equidistance is provided with several four pyramid body grooves on the lower side wall of rectangle groove body, the bottom of four pyramid body grooves all is provided with inner gate, and inner gate, four pyramid body grooves and rectangle groove body are through -going arrangement, filter screen is set in the rectangle groove body of sand mould upper side in proper order, and the periphery of filter screen bottom is in contact with the periphery of four pyramid body groove top wall and sets up, and filter screen one -to -one corresponding is hung in the upper side of connecting mouth, and the two filter screens between adjacent are matched and set up, and the outer wall of filter screen is in contact with the inner wall of rectangle groove body and sets up, four pyramid body grooves provide all -round support for filter screen bottom, effectively prevent edge fracture, simultaneously, adjacent filter screen is closely in contact and arranges, and the sand mould structure strength is strengthened, and the sand mould fracture problem caused by too small interval is avoided.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a casting filter screen overlap structure. Background Technology

[0002] In modern casting technology, in order to reduce the risk of slag inclusions in castings, a filter screen needs to be placed at the ingate to filter out impurities such as slag in the molten metal and improve the quality of the castings.

[0003] Typically, a filter screen holder structure needs to be fabricated on the mold so that the sand mold or sand core has a recessed structure for placing the filter screen. However, to reduce costs, the distance between the sand mold and the mold must be controlled within a reasonable range. For some tall castings, where a large number of filter screens are required but the arrangement space is relatively limited, the filter screens need to be arranged linearly and closely together (existing technology 1, such as...). Figure 6-7 This arrangement results in the filter screen in the middle section having only two sides for support at the bottom, posing a risk of breakage under prolonged scouring by molten metal; therefore, a linear arrangement of one or two filter screens is adopted (existing technology 2, such as...). Figure 8-9 However, this arrangement requires a certain gap between the two filter screens. If the gap is too large, it will waste space. If the gap is too small, the sand mold between the two filter screen seats will easily break during the molding process. (The filter screens that are widely used now are cube-shaped. The slope of the filter screen seat in the height direction cannot be too large. After the filter screen is placed in the filter screen seat in the sand mold or sand core, it must be stable and the gap around it cannot be too large.) Utility Model Content

[0004] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a reasonably designed and easy-to-use overlapping structure for casting filter screens, which can effectively solve the defects of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: It comprises: A sand mold, wherein a rectangular groove is provided on the upper side of the sand mold, and several square pyramidal grooves are provided at equal intervals on the lower side wall of the rectangular groove. An ingate is provided at the bottom of each square pyramidal groove, and the ingate, the square pyramidal groove and the rectangular groove are interconnected. The filter screen consists of several screens arranged sequentially in a rectangular groove on the upper side of the sand mold. The bottom perimeter of the filter screen abuts against the perimeter of the top wall of the pyramidal groove. The filter screens are suspended one by one on the upper side of the pyramidal groove. Adjacent filter screens abut against each other. The outer wall of the filter screen abuts against the inner wall of the rectangular groove. With the above technical solution, the filter screen is placed in the rectangular groove, and all four sides of the bottom of the filter screen can be supported, which avoids the phenomenon of the filter screen breaking on the unsupported side. At the same time, several filter screens cooperate to resist each other, which avoids the sand-shaped breakage between two filter screens due to the small spacing.

[0006] As a further improvement of this utility model, the filter screen is made of a plate with a length and width of 150mm and a height of 40mm. Several longitudinal filter holes and transverse filter holes are equidistantly arranged on the filter screen, and adjacent longitudinal filter holes and transverse filter holes are interconnected.

[0007] As a further improvement of this utility model, the top dimension of the quadrangular pyramidal groove is 120*120mm, and the bottom dimension is 80*80mm; With the above technical solution, the inclination of the quadrangular pyramid groove is 20mm, which is beneficial for sand mold release.

[0008] As a further improvement of this utility model, a supporting groove is provided on the peripheral wall of the rectangular groove, and the upper side wall of the supporting groove is inclined to the outside. The above technical solution facilitates the upward movement of the filter screen from the rectangular trough, and the inclined structure prevents the filter screen from swaying within the rectangular trough and the support trough.

[0009] As a further improvement of this utility model, the rectangular groove has a size of 600*150mm, the bottom of the groove has a size of 600*150mm, and the top of the groove has a size of 602*152mm. The above technical solution provides a 1mm circumferential slope along the support groove, which facilitates the removal of the filter screen without affecting normal use.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The casting filter screen overlapping structure described in this utility model provides all-round support for the bottom of the filter screen through the four-sided pyramidal groove, effectively preventing edge breakage; at the same time, the close contact layout of adjacent filter screens enhances the strength of the sand mold structure and avoids the problem of molding sand breakage caused by insufficient spacing. This utility model has the advantages of reasonable design and low manufacturing cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a cross-sectional view of the structure of this utility model.

[0013] Figure 3 for Figure 2 Enlarged view of section A.

[0014] Figure 4This is a schematic diagram of the structure of the filter screen in this utility model.

[0015] Figure 5 This is a schematic diagram of the sand mold structure in this utility model.

[0016] Figure 6 This is a structural cross-sectional view of prior art 1.

[0017] Figure 7 This is a schematic diagram of the sand mold structure in prior art 1.

[0018] Figure 8 This is a schematic diagram of the structure of prior art 2.

[0019] Figure 9 This is a schematic diagram of the sand mold structure in prior art 2.

[0020] Explanation of reference numerals in the attached figures: Sand mold 1, rectangular groove 2, square pyramidal groove 3, ingate 4, filter screen 5, longitudinal filter holes 6, transverse filter holes 7, support groove 8. Detailed Implementation

[0021] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example 1:

[0023] like Figures 1-5 As shown, this embodiment includes: Sand mold 1, wherein a rectangular groove 2 is formed on the upper side of the sand mold 1, and several square pyramidal grooves 3 are formed at equal intervals on the lower side wall of the rectangular groove 2, and an ingate 4 is formed at the bottom of each square pyramidal groove 3. The ingate 4, the square pyramidal grooves 3 and the rectangular groove 2 are interconnected. The top dimension of the square pyramidal groove 3 is 120*120mm, and the bottom dimension is 80*80mm. The filter screen 5 consists of several screens, which are sequentially arranged in the rectangular groove 2 on the upper side of the sand mold 1. The bottom perimeter of the filter screen 5 abuts against the perimeter of the top wall of the pyramidal groove 3. The filter screens 5 are suspended one by one on the upper side of the pyramidal groove 3, and adjacent filter screens 5 are abutted against each other. The outer wall of the filter screen 5 abuts against the inner wall of the rectangular groove 2. The filter screen 5 is made of a plate with a length and width of 150mm and a height of 40mm. Several longitudinal filter holes 6 and transverse filter holes 7 are equally spaced on the filter screen 5, and adjacent longitudinal filter holes 6 and transverse filter holes 7 are interconnected. A support groove 8 is provided on the peripheral wall of the rectangular groove 2. The upper side wall of the support groove 8 is inclined outward, which facilitates the upward movement of the filter screen 5 from the rectangular groove 2. The inclined structure can also prevent the filter screen 5 from shaking in the rectangular groove 2 and the support groove 8. The rectangular groove 2 has a size of 600*150mm, the bottom size of the support groove 8 is 600*150mm, the top size of the support groove 8 is 602*152mm, and the circumferential slope of the support groove 8 is 1mm. This does not affect normal use and facilitates the removal of the filter screen 5. The inclination of the four-sided pyramidal groove 3 is 20mm, which is beneficial for the demolding of the sand mold 1.

[0024] When using this utility model, the filter screen 5 is placed in the rectangular groove 2. The bottom of the filter screen 5 can be supported on all four sides to prevent the unsupported side of the filter screen 5 from breaking. At the same time, several filter screens 5 cooperate to resist each other to prevent the sand mold 1 located between two filter screens 5 from breaking due to the small spacing.

[0025] Compared with the prior art, the beneficial effects of this specific embodiment are as follows: 1. The four-sided pyramidal groove 3 structure provides stable and uniform support for the bottom of the filter screen 5, which can effectively resist the impact of molten metal, significantly reduce the risk of the filter screen 5 breaking due to local suspension or insufficient support, and improve reliability. 2. The adjacent filter screens 5 adopt a close-fitting contact layout, which eliminates the narrow sand mold 1 partition that exists when the traditional side-by-side installation is carried out, enhances the structural strength of the area, and effectively prevents sand inclusion defects caused by the breakage of the molding sand. 3. The inclined support grooves 8 set on the two sides of the rectangular groove form a slight draft angle, which ensures that the filter screen 5 is stable and does not shake after installation, and also makes it easy to remove it upwards during maintenance or cleaning, making the operation more convenient. 4. The inclined sidewalls of the quadrangular pyramid groove 3 and the precisely controlled slight inclination of the support groove 8 together ensure that the sand mold 1 can be successfully demolded during the molding process without affecting the overall accuracy of the cavity and normal use.

[0026] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filter screen overlap structure for casting, characterized in that, It contains: A sand mold (1) is provided with a rectangular groove (2) on the upper side. Several square pyramidal grooves (3) are provided at equal intervals on the lower side wall of the rectangular groove (2). An ingate (4) is provided at the bottom of each square pyramidal groove (3). The ingate (4), the square pyramidal groove (3) and the rectangular groove (2) are interconnected. The filter screen (5) consists of several screens, which are arranged sequentially in the rectangular groove (2) on the upper side of the sand mold (1). The bottom perimeter of the filter screen (5) is in contact with the perimeter of the top wall of the pyramidal groove (3). The filter screens (5) are suspended one by one on the upper side of the pyramidal groove (3). The two adjacent filter screens (5) are in contact with each other. The outer wall of the filter screen (5) is in contact with the inner wall of the rectangular groove (2).

2. The overlapping structure of a filter screen for casting according to claim 1, characterized in that: The filter screen (5) is made of a plate with a length and width of 150mm and a height of 40mm. Several longitudinal filter holes (6) and transverse filter holes (7) are equidistantly arranged on the filter screen (5). Adjacent longitudinal filter holes (6) and transverse filter holes (7) are connected.

3. The overlapping structure of a casting filter screen according to claim 1, characterized in that: The top of the quadrangular pyramidal groove (3) has a size of 120*120mm, and the bottom has a size of 80*80mm.

4. The overlapping structure of a filter screen for casting according to claim 1, characterized in that: The rectangular groove (2) is provided with a support groove (8) on its peripheral wall, and the upper side wall of the support groove (8) is inclined to the outside.

5. The overlapping structure of a filter screen for casting according to claim 4, characterized in that: The rectangular groove (2) has a size of 600*150mm, the bottom of the support groove (8) has a size of 600*150mm, and the top of the support groove (8) has a size of 602*152mm.

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