Lost foam casting box convenient for shakeout

Abstract

The invention relates to the technical field of casting, in particular to an evanescent mode casting box convenient for shakeout, which comprises an outer shell, the supporting part comprises two sets of bottom plates which are matched to block the bottom of the outer shell, the sides, away from each other, of the two sets of bottom plates are rotationally connected to the outer shell through rotating shafts, and in the gap space between the outer shell and the inner shell, the upper end faces of the bottom plates are rotationally connected with connecting pieces; the inner shell is arranged in the outer shell in a spaced mode, each inner shell comprises two U-shaped pieces, the two U-shaped pieces are symmetrically arranged and define a closed structure, and the other ends of the connecting pieces are rotationally connected to the U-shaped pieces. The inner shells are arranged in the outer shell at intervals, and the cavities can be disassembled while the bottoms of the inner shells are opened, so that the sand mold naturally falls under the influence of gravity.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a lost foam casting box which is convenient for sand dropping. Background Art

[0002] The lost foam casting box is an outer box based on lost foam casting, which is mainly used to carry molding sand. In actual use, half of the molding sand is sunk into the casting box in advance, and the prefabricated foam workpiece is placed in it. Then the remaining molding sand is sunk into the casting box so that the prefabricated foam workpiece is completely submerged in the molding sand. The molten metal is poured in through the reserved pouring port. The high-temperature molten metal corrodes the foam workpiece and replaces it to form a cast workpiece. After the casting is completed, the falling sand is a necessary procedure for removing the workpiece.

[0003] In the prior art, the sand is generally dropped out by opening the bottom. However, the molding sand needs to be compacted during lost foam casting. When the bottom cover of the box is opened, the molding sand is still difficult to fall out. Summary of the invention

[0004] The present invention aims to solve the problem that after the medium-sized sand in the prior art is compacted, the bottom is opened but still difficult to fall off, and provides a lost foam casting box that is convenient for sand falling off. The specific technical scheme is as follows:

[0005] Lost foam casting box for easy sand dropping, including:

[0006] An outer shell, the outer shell is connected vertically;

[0007] A support part, the support part includes two groups of bottom plates that cooperate to block the bottom of the outer shell, the two groups of bottom plates are rotatably connected to the outer shell through a rotating shaft on one side away from each other, and a connecting piece is rotatably connected to the upper end surface of the bottom plate in the gap space between the outer shell and the inner shell;

[0008] and an inner shell arranged at intervals in the outer shell, wherein the inner shell comprises two "U"-shaped pieces, the two "U"-shaped pieces are symmetrically arranged and enclosed to form a closed structure, and the other end of the connecting piece is rotatably connected to the "U"-shaped piece;

[0009] The two groups of bottom plates are driven by an external force to rotate downward and transform the "U"-shaped parts from a combined state to a disassembled state;

[0010] In the combined state, the two groups of "U"-shaped parts contact each other and surround each other to form an inner shell;

[0011] In the disassembled state, there is a gap between the two groups of "U"-shaped parts, and the inner shell is disassembled.

[0012] As a further technical solution of the present invention, the two groups of bottom plates, on one side of which the bottom plates conflict with each other, present a staggered stepped structure. In the combined state, the two groups of bottom plates cooperate with each other and seal the outer shell. The two groups of bottom plates are driven by an external force to rotate downward alternately.

[0013] As a further technical solution of the present invention, each group of the rotating shafts has a corresponding driving part, which includes a hydraulic push rod rotatably mounted on the outer shell and a crank rotatably connected to the output end of the hydraulic push rod, and the other end of the crank is connected to the rotating shaft.

[0014] As a further technical solution of the present invention, in the assembled state, the inner shell cooperates with the supporting part to form a mold cavity for carrying molding sand.

[0015] As a further technical solution of the present invention, the "U"-shaped part includes a main board and two groups of sub-boards connected in parallel to the main board, a sliding rod is connected to the top of the main board, a cover plate is covered on the outer shell, a slide track is opened on the cover plate, and the sliding rod is embedded and slides in the slide track.

[0016] As a further technical solution of the present invention, a slide groove is provided on the main board, and a sliding block is slidably connected to the sub-board. The sub-board is slidably connected to the main board through the slide groove and the slider. A second slide rod is connected to the top of the sub-board, and a second slideway corresponding to the second slide rod is provided on the cover plate. The second slideway is an inclined structure and extends outward. The sub-board moves synchronously with the main board and at the same time moves relative to the main board, and the relative movement direction is perpendicular to the synchronous movement direction.

[0017] As a further technical solution of the present invention, in the assembled state, the inner diameter of the cover plate matches the inner diameter of the inner shell.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) In the present application, an inner shell is arranged inside an outer shell at intervals, and the inner shell can be opened at the bottom to disintegrate the mold cavity, forcing the sand mold to fall naturally under the influence of gravity.

[0020] (2) In the present application, when the inner shell body is transformed from the assembled state to the disassembled state, the sub-plate moves outward synchronously with the main plate. Limited by the second track of the slideway, the second slide bar slides along the second track of the slideway, that is, the sub-plate moves relative to the main plate, and the relative movement direction is perpendicular to the synchronous movement direction, so that the inner shell body explodes as a whole, releasing the four sides and the bottom support of the mold sand, so that the mold sand is directly suspended in the air and restricted by gravity to fall, which is conducive to sand falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure schematic diagram of the lost foam casting box which is convenient for sand falling is shown;

[0022] Figure 2 A schematic diagram showing the structure of the support portion and the inner shell in the combined state is shown;

[0023] Figure 3 It shows a schematic structural diagram of the support part and the inner shell in a disassembled state;

[0024] Figure 4 A schematic diagram of the exploded structure of the "U"-shaped member is shown;

[0025] Figure 5 A schematic diagram showing the matching structure of the cover plate and the inner shell in the assembled state is shown;

[0026] Figure 6 A schematic diagram of the matching structure between the cover plate and the inner shell in the exploded state is shown.

[0027] Description of the drawings: 100, outer shell; 200, support part; 210, bottom plate; 220, rotating shaft; 230, connecting piece; 240, hydraulic push rod; 250, crank; 300, inner shell; 310, "U"-shaped part; 311, main plate; 312, sub-plate; 313, slide bar 1; 314, slide groove; 315, slider; 316, slide bar 2; 400, cavity; 500, cover plate; 510, slide way 1; 520, slide way 2. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0029] In view of the need to compact the molding sand during lost foam casting in the prior art, the molding sand is still difficult to fall when the bottom cover of the box is opened; the present application provides a mold cavity with a split structure, which can disintegrate the mold cavity when the bottom is opened, forcing the sand mold to fall naturally under the influence of gravity.

[0030] Figure 1 The overall structure schematic diagram of the lost foam casting box which is convenient for sand falling is shown; Figure 1The lost foam casting box for easy sand falling comprises an outer shell 100 which passes through from top to bottom and a support portion 200 which blocks the bottom of the outer shell 100. Inner shells 300 are arranged at intervals inside the outer shell 100. The inner shell 300 cooperates with the support portion 200 to form a mold cavity 400 for carrying molding sand. The outer shell 100 is covered with a cover plate 500, and the inner diameter of the cover plate 500 matches the inner diameter of the inner shell 300. A new inner shell 300 is arranged inside the outer shell 100. In the assembled state, the inner shell 300 cooperates with the support portion 200 to form the mold cavity 400 and carry the molding sand. In the disassembled state, the support portion 200 releases the blockage of the bottom of the inner shell 300 and forces the inner shell 300 to disintegrate, so that the sand mold falls naturally.

[0031] Figure 2 It shows a schematic structural diagram of the support portion 200 and the inner shell 300 in the combined state; Figure 3 It shows a schematic structural diagram of the support portion 200 and the inner shell 300 in a disassembled state; Figure 2 and Figure 3In the embodiment, the support portion 200 includes two groups of bottom plates 210 that cooperate to block the bottom of the outer shell 100. The sides of the two groups of bottom plates 210 that are away from each other are rotatably connected to the outer shell 100 through a rotating shaft 220. In the gap space between the outer shell 100 and the inner shell 300, the upper end surface of the bottom plate 210 is rotatably connected with a connecting piece 230. When the rotating shaft 220 is driven to rotate, the bottom plate 210 will rotate downward around the rotating shaft 220. As the two groups of bottom plates 210 rotate downward and open, the release The bottom of the outer shell 100 is blocked, that is, the device is transformed from the combined state to the disassembled state; the inner shell 300 includes two "U"-shaped parts 310, which are symmetrically arranged and enclosed to form a closed structure, and the other end of the connecting member 230 is rotatably connected to the "U"-shaped part 310. The two groups of the bottom plates 210 are driven by an external force to rotate downward and make the "U"-shaped part 310 transform from the combined state to the disassembled state; in the combined state, the two groups of the "U"-shaped parts 310 are mutually The two sets of "U"-shaped pieces 310 are interlocked and enclosed to form the inner shell 300; in the disassembled state, there is a gap between the two sets of "U"-shaped pieces 310, and the inner shell 300 is disassembled; in the assembled state, the two "U"-shaped pieces 310 cooperate to form a closed structure to carry the sand mold, and in the disassembled state, as the bottom plate 210 rotates downward, the two sets of "U"-shaped pieces 310 can be driven away from each other and disassembled by the traction of the connecting piece 230, thereby releasing the restriction on the molding sand, so that the molding sand can fall naturally under the influence of gravity; the two sets of The sides of the bottom plates 210 that are in contact with each other are in a staggered stepped structure. In the combined state, the two groups of bottom plates 210 cooperate with each other and block the outer shell 100. The two groups of bottom plates 210 are driven by an external force to rotate downward alternately. The staggered stepped structure on the sides of the two bottom plates 210 that are close to each other can completely block the outer shell 100 to avoid a dead angle. When the two groups of bottom plates 210 rotate downward, they rotate alternately to avoid mutual interference between the two bottom plates 210. And, see Figure 1 Each group of the rotating shaft 220 has a corresponding driving part, and the driving part includes a hydraulic push rod 240 rotatably mounted on the outer shell 100 and a crank 250 rotatably connected to the output end of the hydraulic push rod 240, and the other end of the crank 250 is connected to the rotating shaft 220; when the hydraulic push rod 240 is started, the output end of the hydraulic push rod 240 drives one end of the crank 250, and the crank 250, the rotating shaft 220 and the bottom plate 210 can be driven to rotate downward around the rotating shaft 220 as the axis, and the two groups of driving parts can be respectively corresponding to the two groups of bottom plates 210 to achieve alternating downward rotation.

[0032] Figure 4 A schematic diagram of the exploded structure of the "U"-shaped member 310 is shown; Figure 5 A schematic diagram showing the matching structure of the cover plate 500 and the inner shell 300 in the assembled state is shown; Figure 6A schematic diagram of the matching structure of the cover plate 500 and the inner shell 300 in the disassembled state is shown; Figure 4-Figure 6 In the embodiment, the "U"-shaped member 310 includes a main board 311 and two groups of sub-boards 312 connected in parallel to the main board 311. A slide bar 313 is connected to the top of the main board 311. A slideway 510 is provided on the cover plate 500. The slide bar 313 is embedded and slides in the slideway 510. When the bottom plate 210 is rotated downward and a traction force is applied to the main board 311, the main board 311 can be driven to slide along the track of the slideway 510, thereby realizing disintegration. Moreover, since the slide bar 313 and the slideway 510 are embedded sliding structures, when the support of the bottom plate 210 below disappears, the slideway 510 can prevent the main board 311 from falling. A slide groove 314 is provided on the main board 311. The sub-board 312 is connected to a slide block 315 for sliding connection. The sub-board 312 is slidably connected to the main board through the slide groove 314 and the slide block 315. 311, the top of the sub-plate 312 is connected with a second slide bar 316, and the cover plate 500 is provided with a second slideway 520 corresponding to the second slide bar 316, and the second slideway 520 is in an inclined structure and extends outward, and the sub-plate 312 moves synchronously with the main board 311 and moves relative to the main board 311, and the relative movement direction is perpendicular to the synchronous movement direction; when converting from the combined state to the decomposed state, the sub-plate 312 moves synchronously with the main board 311 to the outside, and limited by the track of the second slideway 520, the second slide bar 316 slides along the track of the second slideway 520, that is, the sub-plate 312 moves relative to the main board 311, and the relative movement direction is perpendicular to the synchronous movement direction, so that the inner shell 300 explodes as a whole, releasing the four sides and the bottom support that restrict the molding sand, so that the molding sand is directly suspended in the air and restricted to fall by gravity, which is conducive to sand falling.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Lost foam casting box that is convenient for sand dropping, characterized in that: include: An outer shell (100), the outer shell (100) being connected vertically; A support portion (200), the support portion (200) comprising two groups of bottom plates (210) cooperating to block the bottom of the outer shell (100), the two groups of bottom plates (210) being rotatably connected to the outer shell (100) via a rotating shaft (220), and the upper end surface of the bottom plate (210) being rotatably connected to a connecting piece (230) in the gap space between the outer shell (100) and the inner shell (300); and an inner shell (300) arranged at intervals inside the outer shell (100), the inner shell (300) comprising two "U"-shaped members (310), the two "U"-shaped members (310) being symmetrically arranged and enclosing each other to form a closed structure, and the other end of the connecting member (230) being rotatably connected to the "U"-shaped member (310); The two groups of bottom plates (210) are driven by an external force to rotate downward and cause the "U"-shaped member (310) to switch from a combined state to a disassembled state; In the assembled state, the two groups of "U"-shaped members (310) contact each other and surround each other to form an inner shell (300); In the disassembled state, there is a gap between the two sets of the “U”-shaped members (310), and the inner shell (300) is disassembled.

2. The lost foam casting box for easy sand removal according to claim 1, characterized in that: The sides of the two groups of bottom plates (210) that are in contact with each other present a staggered stepped structure. In a combined state, the two groups of bottom plates (210) cooperate with each other and seal the outer shell (100). The two groups of bottom plates (210) are driven by an external force to rotate downward alternately.

3. The lost foam casting box for easy sand dropping according to claim 2 is characterized in that: Each group of the rotating shafts (220) has a corresponding driving unit, which includes a hydraulic push rod (240) rotatably mounted on the outer shell (100) and a crank (250) rotatably connected to the output end of the hydraulic push rod (240), and the other end of the crank (250) is connected to the rotating shaft (220).

4. The lost foam casting box for easy sand dropping according to claim 3 is characterized in that: In the assembled state, the inner shell (300) cooperates with the support portion (200) to form a mold cavity (400) for carrying molding sand.

5. The lost foam casting box for easy sand removal according to claim 4 is characterized in that: The "U"-shaped member (310) comprises a main board (311) and two sets of sub-boards (312) connected in parallel to the main board (311); a slide bar (313) is connected to the top of the main board (311); a cover plate (500) is covered on the outer shell (100); a slideway (510) is provided on the cover plate (500); and the slide bar (313) is embedded and slidably mounted in the slideway (510).

6. The lost foam casting box for easy sand removal according to claim 5 is characterized in that: The main board (311) is provided with a slide groove (314), the auxiliary board (312) is connected with a slider (315) which is slidably connected to the main board (311) through the slide groove (314) and the slider (315), the top of the auxiliary board (312) is connected with a second slide bar (316), the cover board (500) is provided with a second slideway (520) corresponding to the second slide bar (316), the second slideway (520) is in an inclined structure and extends outward, the auxiliary board (312) moves synchronously with the main board (311) and at the same time moves relative to the main board (311), and the relative movement direction is perpendicular to the synchronous movement direction.

7. The lost foam casting box for easy sand removal according to claim 6 is characterized in that: In the assembled state, the inner diameter of the cover plate (500) matches the inner diameter of the inner shell (300).

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