Sand spraying machine for investment casting

Abstract

The utility model discloses a sand spraying machine for investment casting, which is characterized in that the upper end of a base is provided with a sand spraying barrel body, the side wall of the upper end of the sand spraying barrel body is provided with a fixing bracket for fixing a wax mold, the upper end of the sand spraying barrel body is provided with a sand screening mechanism, the sand screening mechanism comprises an annular sand screening plate, and the sand screening plate is inclined downwards from the outer end to the inner end; the sand spraying barrel body comprises a coarse material collecting cavity formed in the middle and a fine material collecting cavity formed in the outer end, a bottom plate of the coarse material collecting cavity is higher than a bottom plate of the fine material collecting cavity, the sand spraying machine further comprises a sand pumping mechanism used for conveying sand in the fine material collecting cavity to the position above the outer end of the sand screening plate, and the inner end of the sand screening plate extends to the upper end of the coarse material collecting cavity. According to the sand spraying machine, the sand spraying barrel body is divided into the coarse material collecting cavity and the fine material collecting cavity, fine materials fall onto a wax mold from screen holes of the sand screening plate to be subjected to sand spraying operation, coarse sand directly falls into the coarse material collecting cavity through the sand screening plate to be recycled, efficient screening, conveying and recycling of the sand are achieved, and the utilization efficiency of the sand is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of investment casting equipment, and in particular to a sand-spraying machine for investment casting. Background Technology

[0002] In investment casting, the sand coating process is crucial, directly affecting the quality and surface finish of the casting. The sand needs to be evenly distributed during coating to ensure a smooth, porosity-free casting surface. Furthermore, a sand-drenching process is required during mold drying to ensure sand uniformity and prevent uneven hardening layers from remaining on the wax pattern surface.

[0003] However, existing sand-washing equipment has problems such as small sand hoppers and poor sand screening function. In response to the above technical problems, some improvements have been proposed in the prior art. For example, the patent with authorization announcement number CN105562607B discloses an annular sand-washing machine for investment casting, including a frame, an annular wax mold frame mechanism for fixing wax molds on the frame, an annular sand screening mechanism above the wax mold frame mechanism, and a lifting mechanism for transporting sand in the middle of the annular sand-washing machine.

[0004] The improved sand-spraying machine described above completes the sand-spraying operation on the wax mold by rotating in a ring. It has the advantages of simple and effective structure, fully automatic sand-spraying, uniform and thorough sand-spraying, low energy consumption and long service life. However, the following problems still exist: (1) The sand screen is set horizontally. After working for a certain period of time when screening the sand, the sand screen needs to be cleaned manually. Otherwise, the large sand particles will clog the sand screen and affect the operation of the device. (2) The sand lifting device can transport the sand to one direction of the ring sand-spraying machine, which has low efficiency. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a sand-spraying machine for investment casting, which divides the sand-spraying tank into a coarse material collection chamber and a fine material collection chamber. The coarse and fine materials are screened by an inclined sand-screening plate. The fine material falls from the screen holes of the sand-screening plate onto the wax model for sand-spraying, while the coarse sand falls directly into the coarse material collection chamber for recycling after passing through the sand-screening plate. This achieves efficient screening, conveying and recycling of sand, improves the utilization efficiency of sand, optimizes the casting process and reduces sand waste.

[0006] Technical solution:

[0007] A sand-spraying machine for investment casting includes a base, a sand-spraying barrel at the upper end of the base, a fixing bracket for fixing a wax film on the upper side wall of the sand-spraying barrel, a sand-screening mechanism at the upper end of the sand-spraying barrel, the sand-screening mechanism including an annular sand-screening plate, the sand-screening plate inclined downward from the outer end to the inner end, the sand-spraying barrel including a coarse material collection chamber in the middle and a fine material collection chamber at the outer end, the bottom plate of the coarse material collection chamber being higher than the bottom plate of the fine material collection chamber, the sand-spraying machine also includes a sand-drawing mechanism for conveying the sand in the fine material collection chamber to the upper end of the outer end of the sand-screening plate, the inner end of the sand-screening plate extending to the upper end of the coarse material collection chamber.

[0008] Furthermore, the sand extraction mechanism includes a pneumatic sand extraction machine and a sand extraction pipe, one end of which is connected to the bottom of the fine material collection chamber.

[0009] Furthermore, the sand-spraying machine also includes a conical dispersion disc, the sand outlet of the pneumatic sand pump is located at the upper end of the conical dispersion disc, and the outer end of the conical dispersion disc extends to the upper end of the screen plate.

[0010] Furthermore, an annular baffle is provided at the outer end of the sand screening plate.

[0011] Furthermore, the upper surface of the conical dispersion disc is provided with multiple connecting plates, which are fixedly connected to the sand screening plate.

[0012] Furthermore, the number of connecting plates is the same as that of the fixed brackets, and they are staggered with the fixed brackets in the horizontal cross section.

[0013] Furthermore, the bottom of the coarse material collection chamber is connected to a discharge pipe, which extends through the fine material collection chamber to the outside of the sand-washing barrel.

[0014] Furthermore, the inner end of the sand screening plate is connected to the outer wall of the coarse material collection chamber.

[0015] Furthermore, the top opening of the coarse material collection chamber is funnel-shaped.

[0016] Furthermore, a support seat is fixedly provided downward at the outer end of the annular baffle.

[0017] Beneficial effects: The sand-washing tank is divided into a coarse material collection chamber and a fine material collection chamber. The coarse and fine materials are screened by an inclined sand-screening plate. The fine material falls from the screen holes of the sand-screening plate onto the wax model for sand washing. The coarse sand falls directly into the coarse material collection chamber for recycling after passing through the sand-screening plate. This achieves efficient screening, conveying and recycling of sand, improves the utilization efficiency of sand, optimizes the casting process and reduces sand waste. The sand-drawing mechanism, in conjunction with the conical dispersion plate, directly conveys the sand to the outer end of the sand-screening plate in all directions. Multiple wax models are sand-washed simultaneously, which improves the sand washing efficiency. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 The three-dimensional view of this utility model in its sectional state Figure 1 ;

[0020] Figure 3 The three-dimensional view of this utility model in its sectional state Figure 2 ;

[0021] Figure 4 This is a three-dimensional representation of the cross-section of this utility model. Figure 3 ;

[0022] Reference numerals in the attached drawings: 1. Base; 2. Sand-spraying tank body; 21. Coarse material collection chamber; 22. Fine material collection chamber; 23. Discharge pipe; 3. Sand screening mechanism; 31. Sand screening plate; 32. Annular baffle; 4. Sand pumping mechanism; 41. Pneumatic sand pump; 42. Sand pumping pipe; 5. Fixed bracket; 6. Conical dispersion disc; 7. Connecting plate; 8. Support base. Detailed Implementation

[0023] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1-4 As shown, a sand-spraying machine for investment casting includes a base 1, a sand-spraying barrel 2 at the upper end of the base, a fixing bracket 5 for fixing a wax film on the upper side wall of the sand-spraying barrel 2, a sand-screening mechanism 3 at the upper end of the sand-spraying barrel 2, the sand-screening mechanism 3 including an annular sand-screening plate 31, the sand-screening plate 31 inclined downward from the outer end to the inner end, the sand-spraying barrel 2 including a coarse material collection chamber 21 in the middle and a fine material collection chamber 22 at the outer end, the bottom plate of the coarse material collection chamber 21 being higher than the bottom plate of the fine material collection chamber 22, the sand-spraying machine also includes a sand-drawing mechanism 4 for conveying the sand in the fine material collection chamber 22 to the upper end of the outer end of the sand-screening plate 31, the inner end of the sand-screening plate 31 extending to the upper end of the coarse material collection chamber 21. The sand screening plate 31 is inclined from the outside to the inside, which can effectively screen fine sand and coarse sand. The fine sand falls through the screen holes onto the wax mold for sand application, while the coarse sand is guided into the coarse material collection chamber 21 for easy recycling. The use of the annular sand screening plate 31 can effectively screen the sand, ensure uniform distribution of the sand, and maximize screening efficiency.

[0026] In this embodiment, the sand extraction mechanism 4 includes a pneumatic sand extractor 41 and a sand extraction pipe 42. One end of the sand extraction pipe 42 is connected to the bottom of the fine material collection chamber 22. The pneumatic sand extractor 41 and the sand extraction pipe 42 transport the fine material from the fine material collection chamber to the upper part of the outer end of the sand screen plate 31, which effectively reduces the trouble of manual handling and has a high sand extraction efficiency.

[0027] In this embodiment, the sand-spraying machine further includes a conical dispersing disc 6, and the sand outlet of the pneumatic sand pump 41 is located at the upper end of the conical dispersing disc 6. The outer end of the conical dispersing disc 6 extends above the outer end of the sand screening plate 31. The design of the conical dispersing disc 6 helps to distribute the fine sand flow to the sand screening plate more evenly, which helps to improve the screening and distribution effect of the sand.

[0028] In this embodiment, an annular baffle 32 is provided at the outer end of the sand screening plate 31. The annular baffle 32 helps to prevent sand from overflowing and also improves the stability of the sand screening plate.

[0029] In this embodiment, the upper surface of the conical dispersing disc 6 is provided with multiple connecting plates 7, which are fixedly connected to the sand screening plate 31. The connecting plates 7 serve both to fix the material and to guide the sand.

[0030] In this embodiment, the number of connecting plates 7 is the same as that of the fixed brackets 5, and they are staggered with the fixed brackets 5 in the horizontal cross-section. This structure guides the sand material directly above the wax model.

[0031] In this embodiment, the bottom of the coarse material collection chamber 21 is connected to a discharge pipe 23, which extends through the fine material collection chamber 22 to the outside of the sand washing barrel 2 for recycling coarse materials.

[0032] In this embodiment, the inner end of the sand screening plate 31 is connected to the outer wall of the coarse material collection chamber 21 to prevent coarse material from falling into the fine material collection chamber 22.

[0033] In this embodiment, the top opening of the coarse material collection chamber 21 is funnel-shaped.

[0034] In this embodiment, a support base 8 is fixedly provided downward at the outer end of the annular baffle 32.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A sand sprayer for use in investment casting, characterized by, The sand shower machine comprises a base (1), an upper end of the base is provided with a sand shower barrel (2), an upper end side wall of the sand shower barrel (2) is provided with a fixing support (5) for fixing a wax film, the sand shower barrel (2) is provided with a sand screening mechanism (3) at the upper end, the sand screening mechanism (3) comprises an annular sand screening plate (31), the sand screening plate (31) is inclined downward from the outer end to the inner end, the sand shower barrel (2) comprises a coarse material collecting cavity (21) arranged in the middle and a fine material collecting cavity (22) at the outer end, the bottom plate of the coarse material collecting cavity (21) is higher than that of the fine material collecting cavity (22), the sand shower machine further comprises a sand pumping mechanism (4) for conveying the sand in the fine material collecting cavity (22) to above the outer end of the sand screening plate (31), and the inner end of the sand screening plate (31) extends to the upper end of the coarse material collecting cavity (21).

2. A sand sprayer for use in investment casting according to claim 1, wherein The sand pumping mechanism (4) comprises a pneumatic sand pumping machine (41) and a sand pumping pipe (42), one end of the sand pumping pipe (42) is in communication with the bottom of the fine material collecting cavity (22).

3. A sand sprayer for use in investment casting according to claim 1, wherein The sand shower machine further comprises a conical dispersion disc (6), a sand outlet of the pneumatic sand pumping machine (41) is located at the upper end of the conical dispersion disc (6), and the outer end of the conical dispersion disc (6) extends above the outer end of the sand screening plate (31).

4. A sand sprayer for use in investment casting according to claim 1, wherein The outer end of the sand screening plate (31) is provided with an annular baffle (32).

5. A sand sprayer for use in investment casting according to claim 3, wherein The upper end surface of the conical dispersion disc (6) is provided with a plurality of connecting plates (7), and the connecting plates (7) are fixedly connected with the sand screening plate (31).

6. A sand sprayer for use in investment casting according to claim 5, wherein The number of the connecting plates (7) is the same as that of the fixing supports (5), and the connecting plates (7) and the fixing supports (5) are staggered in the horizontal section.

7. A sand sprayer for use in investment casting according to claim 1, wherein The bottom of the coarse material collecting cavity (21) is connected with a discharge pipe (23), the discharge pipe (23) extends through the fine material collecting cavity (22) to the outside of the sand shower barrel (2).

8. A sand sprayer for use in investment casting according to claim 1, wherein The inner end of the sand screening plate (31) is connected with the outer wall of the coarse material collecting cavity (21).

9. A sand sprayer for use in investment casting according to claim 1, wherein The top openings of the coarse material collecting cavity (21) are all funnel-shaped.

10. A sand sprayer for use in investment casting according to claim 4, wherein The outer end of the annular baffle (32) is fixedly provided with a support seat (8) downward.

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