Vacuum sand box for precision casting

Abstract

The utility model discloses a vacuum sand box for precision casting, which comprises a lower sand box body and an upper sand box body which are stacked, the lower sand box body and the upper sand box body are respectively provided with a lower inner cavity and an upper inner cavity which are communicated with each other, the lower sand box body is provided with a vacuum joint communicated with the lower inner cavity, and crossed partition plates are inserted in the lower sand box body and the upper sand box body. The interiors of the lower sand box body and the upper sand box body are divided into a plurality of cavities by the partition plates, the upper sand box body is fixedly connected with a lifting lug, and a weight is arranged at the upper end opening of the upper sand box body; the upper sand box body and the lower sand box body are combined to form the sand box body, the shell is arranged between the two sand box bodies, and the interiors of the two sand box bodies are vacuumized through the vacuum connectors, so that vacuum pouring of the shell is realized, mold disassembly can be quickly completed, the production efficiency of castings is improved, a plurality of cavities can be separated through the crossed partition plates, and the production efficiency of the castings is improved. And therefore, simultaneous pouring of a plurality of castings is realized, and the production efficiency of the castings is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand boxes, in particular to a vacuum sand box for precision casting. Background Art

[0002] In casting production, after the mold shell is prepared, when the molten metal is poured, in order to avoid sparks during casting, the mold shell needs to be placed in the sand box, and the sand box needs to be evacuated during pouring to achieve the purpose of vacuum pouring, so as to reduce casting defects in the inner cavity and holes of the casting.

[0003] Patent application number CN202321622402.6 discloses a sand box for lost foam casting, including a sand box body, the sand box body including an outer sand box, the inner cavity of the outer sand box is separated by an inner sand box with an upper end extending out, and the upper open end of the outer sand box is sealed with the outer wall of the inner sand box, the wall of the inner sand box is located at the position of the inner cavity of the outer sand box and is provided with a vent hole, the top surface of the inner sand box is provided with a pressure iron, and the top of the inner sand box is provided with a jacking component that can vertically lift the pressure iron to facilitate the laying of a plastic film, the jacking component includes a horizontal fixed shaft correspondingly fixed to the outer wall of the sand box body, and the outer end of the horizontal fixed shaft is rotatably connected to a shaft body A cam, and the distance between the outer end of the cam and its rotation center axis is greater than the distance between the rotation center axis and the top surface of the sand box body, and a handle is provided at the outer end of the cam; in this technical solution, an inner sand box and an outer sand box are used to form a sand box body, and a gap is left between the two boxes to facilitate vacuum extraction. However, a single box structure is used in this solution. After the casting is completed, it is troublesome to remove the mold, which affects the casting efficiency, thereby reducing the production efficiency. Moreover, the interior of the inner sand box is a whole cavity, and multiple small castings cannot be cast at the same time. For this reason, the present application proposes a vacuum sand box for precision casting to solve the above problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a vacuum sand box for precision casting, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a vacuum sand box for precision casting, comprising a stacked lower sand box body and an upper sand box body, the lower sand box body and the upper sand box body are respectively provided with a lower inner cavity and an upper inner cavity connected to each other, the lower sand box body is provided with a vacuum joint connected to the lower inner cavity, the lower sand box body and the upper sand box body are both inserted with cross partitions, the partitions divide the interior of the lower sand box body and the upper sand box body into multiple cavities, the upper sand box body is fixedly connected with a lifting ear, and a pressure iron is provided at the upper port of the upper sand box body.

[0006] Preferably, the lower sand box body includes a lower outer sand box and a lower inner sand box with one end open, the side wall of the lower inner sand box is a perforated plate structure, the open top surfaces of the lower inner sand box and the lower outer sand box are flush and the two are connected by a first ring plate, and a plurality of through holes are arranged on the first ring plate.

[0007] Preferably, the upper sand box body includes an upper outer sand box and an upper inner sand box with open ends, the side wall of the upper inner sand box is a perforated plate structure, and the two ends of the upper inner sand box and the upper outer sand box are connected by a second ring plate, and a plug matching the through hole is provided on the second ring plate located below.

[0008] Preferably, the upper top surface of the upper inner flask is lower than the top surface of the upper outer flask and the weight is placed on the inner side of the upper outer flask.

[0009] Preferably, a handle is provided on the pressure iron.

[0010] Preferably, symmetrical connecting pieces are respectively provided on the outer sides of the lower outer sand box and the upper outer sand box, and the connecting pieces are connected by bolts.

[0011] Preferably, the partition includes a longitudinal partition and a transverse partition with ventilation holes, the longitudinal partition and the transverse partition are cross-arranged, and the longitudinal partition and the transverse partition are respectively provided with an upper wire groove and a lower wire groove.

[0012] Preferably, inner walls of the upper inner sand box and the lower inner sand box are both provided with slots, and the slots are matched with the partitions.

[0013] Compared with the traditional technology, the beneficial effect produced by the utility model is as follows: the utility model forms a sand box body by combining an upper sand box body and a lower sand box body, and during pouring, the mold shell is placed between the two sand box bodies and the inside of the two sand box bodies is evacuated through a vacuum joint to realize vacuum pouring of the mold shell, and the upper sand box body is removed from the lower sand box body, so that the mold can be removed quickly, thereby improving the casting production efficiency, and multiple cavities can be separated by cross-crossed partitions, thereby realizing simultaneous pouring of multiple castings, further improving the casting production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a partial exploded schematic diagram of the overall structure of the utility model;

[0016] Figure 3 It is a schematic cross-sectional diagram of the overall structure of the utility model;

[0017] Figure 4 It is a schematic diagram of the internal decomposition of the lower inner sand box and the upper inner sand box of the utility model;

[0018] Figure 5 This is a schematic diagram of the installation of the first ring plate and the second ring plate of the utility model.

[0019] In the figure: 1. lower sand box body; 101. lower outer sand box; 102. lower inner sand box; 103. first ring plate; 104. through hole; 2. upper sand box body; 201. upper outer sand box; 202. upper inner sand box; 203. second ring plate; 204. intubation tube; 3. lower inner cavity; 4. upper inner cavity; 5. vacuum joint; 6. partition; 601. longitudinal partition; 602. transverse partition; 603. upper wire groove; 604. lower wire groove; 7. cavity; 8. lifting ear; 9. weight; 10. handle; 11. connector; 12. slot. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] like Figure 1-5 As shown, the present embodiment provides a vacuum sand box for precision casting, comprising a stacked lower sand box body 1 and an upper sand box body 2, the lower sand box body 1 and the upper sand box body 2 are respectively provided with a lower inner cavity 3 and an upper inner cavity 4 which are interconnected, the lower sand box body 1 is provided with a vacuum joint 5 which is connected with the lower inner cavity 3, the lower sand box body 1 and the upper sand box body 2 are both inserted with cross partitions 6, the partitions 6 divide the interior of the lower sand box body 1 and the upper sand box body 2 into a plurality of cavities 7, the upper sand box body 2 is fixedly connected with a lifting ear 8, and a weight 9 is provided at the upper port of the upper sand box body 2, and the weight 9 is a ring-shaped structure.

[0022] like Figure 2 , 3As shown in Figures 5 and 6, the lower sand box body 1 includes a lower outer sand box 101 and a lower inner sand box 102 with one end open, the lower outer sand box 101 and the lower inner sand box 102 are separated into a lower inner cavity 3, the side wall of the lower inner sand box 102 is a perforated plate structure, the open top surfaces of the lower inner sand box 102 and the lower outer sand box 101 are flush and the two are connected by a first ring plate 103, and a plurality of through holes 104 are provided on the first ring plate 103. The upper sand box body 2 includes an upper outer sand box 201 and an upper inner sand box 202 with open ends. The upper outer sand box 201 and the upper inner sand box 202 are separated into an upper inner cavity 4. The side wall of the upper inner sand box 202 is a perforated plate structure, and the upper inner sand box 202 and the upper outer sand box 201 are connected at both ends by a second ring plate 203, and a plug 204 matching the through hole 104 is provided on the second ring plate 203 located below. After the upper sand box body 2 is stacked on the lower sand box body 1, the plug 204 is inserted into the through hole 104, so that the upper inner cavity 4 and the lower inner cavity 3 are connected, and the vacuum equipment is connected by using a vacuum structure to evacuate the upper inner cavity 4 and the lower inner cavity 3, thereby completing vacuum casting. The upper top surface of the upper inner flask 202 is lower than the top surface of the upper outer flask 201 and the weight 9 is placed on the inner side of the upper outer flask 201. Four handles 10 are provided on the weight 9 to facilitate lifting the weight 9.

[0023] Symmetrical connecting parts 11 are respectively provided on the outer sides of the lower outer sand box 101 and the upper outer sand box 201. The connecting parts 11 are connected by bolts. The connecting parts 11 are arranged around the intersection of the lower outer sand box 101 and the upper outer sand box 201, and the lower outer sand box 101 and the upper outer sand box 201 are fixedly connected together by bolts.

[0024] like Figure 4 As shown, the partition 6 includes a longitudinal partition 601 and a transverse partition 602 with vents, the longitudinal partition 601 and the transverse partition 602 are cross-arranged, and the longitudinal partition 601 and the transverse partition 602 are respectively provided with an upper wire groove 603 and a lower wire groove 604, the lower wire groove 604 of the transverse partition 602 is correspondingly plugged into the upper wire groove 603 of the longitudinal partition 601, thereby completing the cross-plugging of the longitudinal partition 601 and the transverse partition 602, and then dividing them into multiple cavities 7, and the inner walls of the upper inner sand box 202 and the lower inner sand box 102 are both provided with slots 12, the slots 12 are matched with the partition 6, and the number of slots 12 can be more than the number of partitions 6, so as to facilitate the adjustment of the size of the cavity 7.

[0025] Its working principle is as follows: a sand box body is formed by combining an upper sand box body 2 and a lower sand box body 1. During pouring, a mold shell is placed between the two sand boxes and the inside of the two sand boxes is evacuated through a vacuum joint 5 to achieve vacuum pouring of the mold shell. The upper sand box body 2 is removed from the lower sand box body 1, so that the mold can be removed quickly, thereby improving the casting production efficiency. Moreover, a plurality of cavities 7 can be separated by cross-shaped partitions 6, thereby achieving simultaneous pouring of a plurality of castings, further improving the casting production efficiency.

[0026] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A vacuum sand box for precision casting, comprising a stacked lower sand box body and an upper sand box body, characterized in that: The lower sand box body and the upper sand box body are respectively provided with a lower inner cavity and an upper inner cavity which are interconnected. The lower sand box body is provided with a vacuum joint which is connected with the lower inner cavity. Cross-shaped partitions are inserted in the lower sand box body and the upper sand box body. The partitions divide the interior of the lower sand box body and the upper sand box body into a plurality of cavities. A lifting ear is fixedly connected to the upper sand box body, and a pressure iron is arranged at the upper port of the upper sand box body.

2. A vacuum sand box for precision casting according to claim 1, characterized in that: The lower sand box body includes a lower outer sand box and a lower inner sand box with one end open. The side wall of the lower inner sand box is a perforated plate structure. The open top surfaces of the lower inner sand box and the lower outer sand box are flush and the two are connected by a first ring plate, and a plurality of through holes are arranged on the first ring plate.

3. A vacuum sand box for precision casting according to claim 2, characterized in that: The upper sand box body includes an upper outer sand box and an upper inner sand box with open ends. The side wall of the upper inner sand box is a perforated plate structure, and the ends of the upper inner sand box and the upper outer sand box are connected by a second ring plate, and a plug matching the through hole is arranged on the second ring plate at the bottom.

4. A vacuum sand box for precision casting according to claim 3, characterized in that: The upper top surface of the upper inner flask is lower than the top surface of the upper outer flask and the weight is placed on the inner side of the upper outer flask.

5. The vacuum sand box for precision casting according to claim 1, characterized in that: The pressure iron is provided with a handle.

6. A vacuum sand box for precision casting according to claim 3, characterized in that: Symmetrical connecting pieces are respectively arranged on the outer sides of the lower outer flask and the upper outer flask, and the connecting pieces are connected by bolts.

7. The vacuum sand box for precision casting according to claim 3, characterized in that: The partition includes a longitudinal partition and a transverse partition with ventilation holes, the longitudinal partition and the transverse partition are cross-arranged, and the longitudinal partition and the transverse partition are respectively provided with an upper wire groove and a lower wire groove.

8. A vacuum sand box for precision casting according to claim 7, characterized in that: The inner walls of the upper inner sand box and the lower inner sand box are both provided with slots, and the slots are matched with the partitions.

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