阅读说明：本技术 一种砂型铸造用砂箱 (Sand box for sand casting ) 是由 苏强 张磊 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种砂型铸造用砂箱,包括箱体,所述箱体内腔中间位置设置有铸模件,所述箱体前表面与后表面的底端中间位置对称贯穿安装有两个排气装置,所述箱体的上表面边缘位置固定安装有上箱体,所述排气装置包括与箱体贯穿连接的第一螺纹杆,所述第一螺纹杆的一端固定安装有第一旋把,所述第一螺纹杆的另一端贯穿箱体转动安装有推进机构,所述推进机构的一端固定安装有进气管。本发明通过设置排气装置,在高温金属液倒入型腔后,内部空气通过进气管上的进气孔与第一螺纹杆上的出气孔排出,能够防止铸件产生气孔,同时,因型砂内填充有爪状的进气管,可以抓紧型砂,提高型砂与砂箱的连接固定强度。(The invention discloses a sand box for sand casting, which comprises a box body, wherein a casting module is arranged in the middle of an inner cavity of the box body, two exhaust devices are symmetrically installed in the middle of the bottom ends of the front surface and the rear surface of the box body in a penetrating manner, an upper box body is fixedly installed at the edge position of the upper surface of the box body, each exhaust device comprises a first threaded rod which is connected with the box body in a penetrating manner, a first rotating handle is fixedly installed at one end of each first threaded rod, a propelling mechanism is installed at the other end of each first threaded rod in a penetrating manner through the box body in a rotating manner, and an air inlet pipe is fixedly installed at. According to the invention, the exhaust device is arranged, so that after high-temperature molten metal is poured into the cavity, internal air is exhausted through the air inlet hole in the air inlet pipe and the air outlet hole in the first threaded rod, a casting can be prevented from generating air holes, meanwhile, the claw-shaped air inlet pipe is filled in molding sand, the molding sand can be tightly clamped, and the connecting and fixing strength of the molding sand and the sand box is improved.)

1. The utility model provides a sand box for sand casting, includes box (1), its characterized in that: a casting module (4) is arranged in the middle of the inner cavity of the box body (1), two exhaust devices (2) are symmetrically arranged in the middle of the bottom ends of the front surface and the rear surface of the box body (1) in a penetrating way, an upper box body (7) is fixedly arranged at the edge position of the upper surface of the box body (1), the exhaust device (2) comprises a first threaded rod (26) which is in through connection with the box body (1), one end of the first threaded rod (26) is fixedly provided with a first rotating handle (21), the other end of the first threaded rod (26) penetrates through the box body (1) and is rotatably provided with a propelling mechanism (24), an air inlet pipe (25) is fixedly arranged at one end of the propelling mechanism (24), a plurality of air inlet holes (27) are uniformly formed in the side surface of the air inlet pipe (25), an air outlet hole (22) is formed in the side surface of the first threaded rod (26) close to the first rotating handle (21);

the propelling mechanism (24) comprises a limiting block (242) fixedly mounted at the other end of the first threaded rod (26) and a limiting shell (241) fixedly mounted with the air inlet pipe (25), and a through hole (243) is formed in the connecting position of the limiting shell (241) and the air inlet pipe (25).

2. A sand casting sand box according to claim 1, characterized in that: two adjusting device (5) are installed to the top position symmetry that the side surface of box (1) is close to handle (6), adjusting device (5) are including second threaded rod (52) that run through box (1), the one end fixed mounting of second threaded rod (52) has the second to revolve (53), the other end of second threaded rod (52) runs through box (1) and rotates and installs second advancing mechanism (54), the one end fixed mounting of advancing mechanism (24) has push pedal (51), second advancing mechanism (54) and advancing mechanism (24) are the component of a looks isostructure.

3. A sand casting sand box according to claim 1, characterized in that: the utility model discloses a case device, including box (1), box (3) front surface and rear surface's upper end symmetry fixed mounting has two to case device (3), including fixed mounting to case board (31) and fixed mounting to case board (32) under of box (1) front surface on last box (7) front surface to case device (3), go up to the embedding of the front surface lower extreme of case board (31) and install spring (35), the one end fixed mounting of spring (35) has button (33), run through down the position that corresponds button (33) to case board (32) front surface and seted up locating hole (34), it is fixed through button (33) and locating hole (34) joint to case board (31), lower to case board (32) on going up.

4. A sand casting sand box according to claim 2, characterized in that: the push plate (51) is perpendicular to the inner wall of the box body (1), and the height of the push plate (51) is equal to the depth of the inner cavity of the box body (1).

5. A sand casting sand box according to claim 1, characterized in that: the filter screen is arranged at the opening position of the air inlet hole (27) and is fixedly connected with the opening end of the air inlet hole (27) in a threaded connection mode.

6. A sand casting sand box according to claim 1, characterized in that: handles (6) are symmetrically arranged at the bottom ends of the side surfaces of the box body (1), and the handles (6) are members of a U-shaped structure.

7. A sand casting sand box according to claim 1, characterized in that: the first threaded rod (26) is a component of a hollow threaded rod structure, and scale marks (23) are sprayed on the side surface of the first threaded rod (26).

Technical Field

The invention relates to the technical field of casting equipment, in particular to a sand box for sand casting.

Background

Sand casting refers to a casting method for producing castings in sand, steel, iron and most nonferrous alloys can be obtained by the sand casting method, and because the molding materials used for sand casting are cheap and easy to obtain, the casting mold is simple and convenient to manufacture, and can be suitable for single-piece production, batch production and mass production of castings, the sand casting method is a basic process in casting production for a long time, and the sand box is used for putting the molding sand into the sand box to form the casting mold with a required shape in the casting process.

In the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved: 1. in the casting process, molding sand is filled into a sand box as a molding material for molding, after high-temperature molten metal is poured, a large amount of gas is filled in a cavity of the sand box, and the gas must be smoothly discharged from the molding sand, otherwise, the casting is caused to generate defects such as air holes and the like; 2. when drawing a pattern or turning over the case, need overturn the sand box, cause inside sand mould to remove the skew easily, finally can lead to the product size deviation to appear, reduce product quality.

Therefore, a sand box for sand casting is provided.

Disclosure of Invention

The invention aims to provide a sand box for sand casting, which can convert spiral forward motion into linear forward motion by arranging exhaust devices on the front and rear surfaces of the sand box and rotating a first rotating handle through matching a first threaded rod with threads on the wall of the box body and rotating a limit block in a limit shell through a propelling mechanism, and pushes an air inlet pipe to move to the vicinity of a casting mold, after high-temperature molten metal is poured into a cavity, internal air is exhausted through an air inlet hole on the air inlet pipe and an air outlet hole on the first threaded rod, so that the casting mold can be prevented from generating air holes, meanwhile, as claw-shaped air inlet pipes are filled in the casting mold, the casting mold can be grasped, the connecting and fixing strength of the casting mold and the sand box is improved, the problem that the internal sand mold is easy to move and shift and finally the size of a product is deviated is solved, to solve the problems set forth in the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme: a sand box for sand casting comprises a box body, wherein a casting module is arranged in the middle of an inner cavity of the box body, two exhaust devices are symmetrically arranged in the middle of the bottom ends of the front surface and the rear surface of the box body in a penetrating mode, an upper box body is fixedly arranged at the edge position of the upper surface of the box body, each exhaust device comprises a first threaded rod in penetrating connection with the box body, a first rotating handle is fixedly arranged at one end of each first threaded rod, a propelling mechanism is rotatably arranged at the other end of each first threaded rod penetrating through the box body, an air inlet pipe is fixedly arranged at one end of each propelling mechanism, a plurality of air inlet holes are uniformly formed in the side surface of each air inlet pipe, and air outlet holes are formed in the side surface of each;

the propelling mechanism comprises a limiting block fixedly arranged at the other end of the first threaded rod and a limiting shell fixedly arranged with the air inlet pipe, and a through hole is formed in the connecting position of the limiting shell and the air inlet pipe.

The air inlet pipe on the air exhaust device can be adjusted to a proper air exhaust position according to the size of the casting mould by arranging the air exhaust device to be matched with the propelling mechanism and converting the spiral advancing motion of the first threaded rod into the linear advancing motion by utilizing the propelling mechanism, so that the air inlet pipe can move stably, simultaneously, because of the molding sand intussuseption is filled with the intake pipe of claw form, can grasp the molding sand, improve the fixed strength of being connected of molding sand and sand box, prevent when drawing a pattern or turn-over, cause inside sand mould to remove the skew easily, finally can lead to the problem that the deviation appears in the product size.

Preferably, two adjusting device are installed to the top position symmetry that the side surface of box is close to the handle, adjusting device is including the second threaded rod that runs through the box, the one end fixed mounting of second threaded rod has the second to revolve the handle, the other end of second threaded rod runs through the box and rotates and installs second advancing mechanism, advancing mechanism's one end fixed mounting has the push pedal, second advancing mechanism is the component of a looks isostructure with advancing mechanism.

When in work, because the size and the process method of each casting are different, the size of the sand box used correspondingly is also different, so that the castings with different specifications need to adopt the sand boxes with corresponding sizes, in order to solve the cost of the sand boxes, when castings with different specifications are cast, a large-generation and small-generation mode is usually adopted, and a sand box with a large size is selected for casting and molding, and because the sand box has a large size, the used molding sand amount is larger, when a large sand box is adopted for some small-sized castings, the cost is increased, a large amount of waste sand is generated, the environment is greatly polluted, by arranging the adjusting device and utilizing the second threaded rod and the second propelling mechanism, the rotary motion of the second rotating handle is converted into the linear motion of the propelling handle, make the box can be according to different foundry goods size adjustment die cavity sizes, when reinforcing the sand box commonality, can also the at utmost reduce the molding sand quantity.

Preferably, the upper end symmetry fixed mounting of box front surface and rear surface has two to the case device, to the case device including fixed mounting on last box front surface to the boxboard and fixed mounting in the lower to the boxboard of box front surface, go up to the front surface lower extreme embedding of boxboard and install the spring, the one end fixed mounting of spring has the button, run through the locating hole of having seted up to the position that the boxboard front surface corresponds the button down, go up to the boxboard, pass through button and locating hole joint fixed to the boxboard down.

When the mould assembling device works, the traditional mould assembling positioning of the existing sand casting generally adopts a mode of manufacturing a bolt structure on a sand box and a template, and a bolt is used in the moulding and mould assembling processes, so that the method is high in dimensional accuracy, but the operation process is complicated and difficult, and the requirements on the size and the structure of the sand box are high, and the mould assembling device is only suitable for production line operation with high mechanization degree.

Preferably, the push plate is perpendicular to the inner wall of the box body, and the height of the push plate is equal to the depth of the inner cavity of the box body.

The push plate is perpendicular to the inner wall of the box body, the height of the push plate is equal to the depth of the inner cavity of the box body, so that the push plate and the box body are combined more closely, and the depth of a cavity is guaranteed not to be changed.

Preferably, the opening position of the air inlet hole is provided with a filter screen, and the filter screen is fixedly connected with the opening end of the air inlet hole in a threaded connection mode.

The open position of inlet port is provided with the filter screen, can prevent when the inlet port admits air, and loose molding sand granule gets into downtheholely, causes the inlet port to block up, influences the problem of admitting air, and simultaneously, the filter screen passes through threaded connection's mode and the open end fixed connection of inlet port, and convenient to detach clears up.

Preferably, the following components: handles are symmetrically arranged at the bottom ends of the side surfaces of the box body and are members of a U-shaped structure.

Through adopting above-mentioned technical scheme, the handle is installed to the side surface bottom symmetry of box, and the handle is convenient for the drawing, the case turnover uses, makes things convenient for the staff to operate.

Preferably, the first threaded rod is a member of a hollow threaded rod structure, and the side surface of the first threaded rod is coated with scale marks.

The first threaded rod is a component of a hollow threaded rod structure, exhaust is convenient to carry out, scale marks are sprayed on the side surface of the first threaded rod, the advancing depth of the exhaust device can be accurately observed, and the safety distance between the exhaust device and the cast part is guaranteed.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the exhaust devices are arranged on the front surface and the rear surface of the sand box, the first rotating handle is rotated, the first threaded rod is matched with the threads on the wall of the box body, so that the first threaded rod advances spirally, the limiting block rotates in the limiting shell through the propelling mechanism, the spiral advancing motion is converted into linear advancing motion, the air inlet pipe is pushed to advance to the vicinity of a casting piece, and after high-temperature molten metal is poured into the cavity, the internal air is exhausted through the air inlet hole on the air inlet pipe and the air outlet hole on the first threaded rod, so that the casting piece can be prevented from generating air holes.

2. According to the invention, the exhaust device is matched with the propelling mechanism, and the propelling mechanism is utilized to convert the spiral advancing motion of the first threaded rod into the linear advancing motion, so that the air inlet pipe on the exhaust device can be adjusted to a proper exhaust position according to the size of a casting mould without rotating along with the first threaded rod, the air inlet pipe moves more stably, meanwhile, the claw-shaped air inlet pipe is filled in the casting sand, the casting sand can be grasped, the connecting and fixing strength of the casting sand and the sand box is improved, and the problem that the movement offset of an internal sand mould is easily caused and the product size is finally deviated during stripping or turning over is prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic view of the connection structure of the present invention with the upper case;

FIG. 4 is a schematic view of the exhaust apparatus of the present invention;

FIG. 5 is a schematic view of the propulsion mechanism of the present invention;

FIG. 6 is a schematic view of the structure of the adjusting device of the present invention;

fig. 7 is a schematic structural diagram of the box aligning device of the present invention.

Description of reference numerals:

in the figure: 1. a box body; 2. an exhaust device; 21. a first rotating handle; 22. an air outlet; 23. scale lines; 24. a propulsion mechanism; 241. a limiting shell; 242. a limiting block; 243. a through hole; 25. an air inlet pipe; 26. a first threaded rod; 27. an air inlet; 3. a box aligning device; 31. a pair of box plates is arranged; 32. a lower pair of boxboards; 33. a button; 34. positioning holes; 35. a spring; 4. a mold casting; 5. an adjustment device; 51. pushing the plate; 52. a second threaded rod; 53. a second rotating handle; 54. a second propulsion mechanism; 6. a handle; 7. and (4) an upper box body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 7, the present invention provides a sand box for sand casting, comprising:

a sand box for sand casting comprises a box body 1, wherein a casting module 4 is arranged in the middle of the inner cavity of the box body 1, and two exhaust devices 2 are symmetrically arranged in the middle of the bottom ends of the front surface and the rear surface of the box body 1 in a penetrating mode;

as shown in fig. 3, an upper box body 7 is fixedly arranged at the edge position of the upper surface of the box body 1;

as shown in fig. 4, the exhaust device 2 includes a first threaded rod 26 penetrating and connected to the box body 1, one end of the first threaded rod 26 is fixedly provided with a first knob 21, the other end of the first threaded rod 26 penetrates through the box body 1 and is rotatably provided with a propulsion mechanism 24, one end of the propulsion mechanism 24 is fixedly provided with an air inlet pipe 25, a plurality of air inlet holes 27 are uniformly formed in a side surface of the air inlet pipe 25, and an air outlet hole 22 is formed in a position, close to the first knob 21, of a side surface of the first threaded rod 26;

as shown in fig. 5, the propelling mechanism 24 includes a limiting block 242 fixedly mounted at the other end of the first threaded rod 26 and a limiting shell 241 fixedly mounted with the air inlet pipe 25, and a through hole 243 is formed at a connecting position of the limiting shell 241 and the air inlet pipe 25.

In the casting process, molding sand is filled into a sand box as a molding material for molding, after high-temperature molten metal is poured, a cavity of the sand box is filled with a large amount of gas, the gas must be smoothly discharged from the molding sand, otherwise, the casting piece will have the defects of air holes and the like, in addition, when the mold is pulled up or turned over, the sand box needs to be turned over, the internal sand mold is easy to move and deviate, finally, the size of the product is deviated, the quality of the product is reduced, the exhaust device 2 is arranged on the front surface and the rear surface of the sand box, the first rotating handle 21 is rotated, the first threaded rod 26 is matched with threads on the wall of the box body 1, the first threaded rod 26 is spirally advanced, then the propelling mechanism 24 is used for rotating in the limiting shell 241 by using the limiting block 242, the spiral advancing motion is converted into the linear advancing motion, the air inlet pipe 25 is pushed to advance to the, the internal air is exhausted through the air inlet holes 27 on the air inlet pipe 25 and the air outlet holes 22 on the first threaded rod 26, and air holes can be prevented from being generated on castings, the air exhaust device 2 is arranged to be matched with the propelling mechanism 24, the propelling mechanism 24 is utilized to convert the spiral advancing motion of the first threaded rod 26 into the linear advancing motion, so that the air inlet pipe 25 on the air exhaust device 2 can be adjusted to a proper air exhaust position according to the size of the casting piece 4, the air inlet pipe 25 does not need to rotate along with the first threaded rod 26, the movement of the air inlet pipe 25 is stable, meanwhile, claw-shaped air inlet pipes 25 are filled in the casting sand, the casting sand can be grasped, the connection fixing strength of the casting sand and the sand box is improved, and the problem that the internal sand mold is easy to move and deviate and.

As an embodiment of the present invention, as shown in fig. 6, two adjusting devices 5 are symmetrically installed on the side surface of the box body 1 near the upper position of the handle 6, the adjusting devices 5 include a second threaded rod 52 penetrating through the box body 1, one end of the second threaded rod 52 is fixedly installed with a second rotating handle 53, the other end of the second threaded rod 52 penetrates through the box body 1 and is rotatably installed with a second propelling mechanism 54, one end of the propelling mechanism 24 is fixedly installed with a push plate 51, and the second propelling mechanism 54 and the propelling mechanism 24 are members with the same structure; when in work, because the size and the process method of each casting are different, the size of the sand box used correspondingly is also different, so that the castings with different specifications need to adopt the sand boxes with corresponding sizes, in order to solve the cost of the sand boxes, when castings with different specifications are cast, a large-generation and small-generation mode is usually adopted, and a sand box with a large size is selected for casting and molding, and because the sand box has a large size, the used molding sand amount is larger, when a large sand box is adopted for some small-sized castings, the cost is increased, a large amount of waste sand is generated, the environment is greatly polluted, by arranging the adjusting device 5, the rotary motion of the second rotating handle 53 is converted into the linear motion of the push plate 51 by the second threaded rod 52 and the second pushing mechanism 54, make box 1 can be according to different foundry goods size adjustment die cavity sizes, when reinforcing the sand box commonality, can also the at utmost reduce the molding sand quantity.

As an embodiment of the present invention, as shown in fig. 7, two box aligning devices 3 are symmetrically and fixedly installed at the upper ends of the front surface and the rear surface of the box body 1, each box aligning device 3 includes an upper box aligning plate 31 fixedly installed at the front surface of the upper box body 7 and a lower box aligning plate 32 fixedly installed at the front surface of the box body 1, a spring 35 is embedded and installed at the lower end of the front surface of the upper box aligning plate 31, a button 33 is fixedly installed at one end of the spring 35, a positioning hole 34 is formed in the position, corresponding to the button 33, of the front surface of the lower box aligning plate 32, and the upper box aligning plate 31 and the lower box aligning plate 32 are fixed to the positioning hole 34 through the button 33 in a clamping manner; when the mould assembling device works, the traditional mould assembling positioning of the existing sand casting generally adopts a mode of manufacturing a bolt structure on a sand box and a template, and a bolt is used in the moulding and mould assembling processes, the size precision of the method is high, but the operation process is complicated and difficult, and the requirements on the size and the structure of the sand box are higher, so that the mould assembling device is only suitable for the production line operation with high mechanization degree, and the upper box body 7 and the box body 1 are assembled by arranging the box aligning device 3, inserting the upper box plate 31 into the lower box plate 32 groove, and simultaneously inserting the spring 35 and the button 33 at the lower end of the upper box plate 31 into the positioning hole 34 on the lower box plate 32.

Specifically, as shown in fig. 6, the push plate 51 is perpendicular to the inner wall of the box body 1, and the height of the push plate 51 is equal to the depth of the inner cavity of the box body 1.

Through adopting above-mentioned technical scheme, push pedal 51 sets up with 1 inner wall of box is perpendicular, just push pedal 51 highly equals 1 inner chamber degree of depth of box for push pedal 51 combines more closely with box 1, guarantees not to change the die cavity degree of depth.

Specifically, as shown in fig. 4, a filter screen is disposed at an opening position of the air inlet 27, and the filter screen is fixedly connected with an opening end of the air inlet 27 in a threaded connection manner.

Through adopting above-mentioned technical scheme, the open position of inlet port 27 is provided with the filter screen, can prevent that when inlet port 27 admits air, loose molding sand granule gets into downtheholely, causes inlet port 27 to block up, influences the problem of admitting air, and simultaneously, the filter screen passes through threaded connection's mode and inlet port 27's open end fixed connection, and convenient to detach clears up.

Specifically, as shown in fig. 1, handles 6 are symmetrically installed at the bottom end of the side surface of the box body 1, and the handles 6 are members of a U-shaped structure.

Through adopting above-mentioned technical scheme, handle 6 is installed to the side surface bottom symmetry of box 1, and handle 6 is convenient for the drawing of patterns, the use of tilting the case, makes things convenient for the staff to operate.

Specifically, as shown in fig. 4, the first threaded rod 26 is a member of a hollow threaded rod structure, and the side surface of the first threaded rod 26 is coated with scale marks 23.

Through adopting above-mentioned technical scheme, first threaded rod 26 is the component of a hollow threaded rod structure, conveniently exhausts, and the side surface spraying of first threaded rod 26 is provided with scale mark 23, can accurately observe exhaust apparatus 2's the degree of depth that advances, has guaranteed the safe distance of exhaust apparatus 2 with mould 4.

The working principle is as follows: the invention sets the exhaust device 2 on the front and back surface of the sand box, rotates the first rotating handle 21, uses the first threaded rod 26 to match with the thread on the wall of the box body 1, makes the first threaded rod 26 advance spirally, then uses the pushing mechanism 24, uses the limited block 242 to rotate in the limited shell 241, converts the spiral advancing motion into the linear advancing motion, and pushes the air inlet pipe 25 to advance to the vicinity of the casting mould 4, after the high temperature molten metal is poured into the cavity, the internal air is discharged through the air inlet hole 27 on the air inlet pipe 25 and the air outlet hole 22 on the first threaded rod 26, can prevent the casting from generating air holes, the invention uses the pushing mechanism 24 to convert the spiral advancing motion of the first threaded rod 26 into the linear advancing motion by setting the exhaust device 2 to match with the pushing mechanism 24, makes the air inlet pipe 25 on the exhaust device 2 adjust to the proper exhaust position according to the size of, and need not take place rotatoryly along first threaded rod 26, intake pipe 25 removes comparatively steadily, simultaneously, because of the moulding sand intussuseption is filled with claw-shaped intake pipe 25, can grasp the moulding sand, improves the fixed strength of being connected of moulding sand and sand box, prevents when drawing a pattern or the case overturning, causes inside sand mould to remove the skew easily, finally can lead to the problem that the product size deviation appears.

The using method comprises the following steps: when the invention is used, a casting piece 4 is firstly placed in the middle position in a box body 1, after the casting piece is placed in the middle position, the position of an exhaust device 2 is adjusted, when the exhaust device is adjusted, a first rotating handle 21 is rotated, the first threaded rod 26 is matched with threads on the wall of the box body 1, the first threaded rod 26 is enabled to advance spirally, then a pushing mechanism 24 is enabled to rotate in a limiting shell 241 by a limiting block 242, the advancing movement of the spiral is converted into the linear advancing movement, an air inlet pipe 25 on the exhaust device 2 can be adjusted to a proper exhaust position according to the size of the casting piece 4 without rotating along with the first threaded rod 26, the air inlet pipe 25 moves stably, after the adjustment is completed, molding sand is poured into the box body 1 and compacted, the box body 1 is overturned by a handle 6, the casting piece 4 is taken out and is combined with an upper box body 7, after the adjustment is completed, high-, inside air is discharged through inlet port 27 on the intake pipe 25 and venthole 22 on the first threaded rod 26, can prevent that the foundry goods from producing the gas pocket, and simultaneously, because of the moulding sand intussuseption is filled with claw-shaped intake pipe 25, can clutch the moulding sand, improves the fixed strength of being connected of moulding sand and sand box, prevents when drawing a pattern or tilting, causes inside sand mould to remove the skew easily, finally can lead to the problem that the deviation appears in the product size.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.