CN215879776U - Sand box for lost foam casting - Google Patents

Abstract

The utility model relates to a sand box is used in lost foam casting belongs to the field of casting sand box, and it includes cope flask and drag flask, and the cope flask is fixed to be set up in the drag flask top, and first ring channel has been seted up to the drag flask upper wall, and the second ring channel has been seted up to the one end that the cope flask is connected with the drag flask, is equipped with first sealing washer and heat-proof device in first ring channel and the second ring channel, and heat-proof device sets up the inboard at first sealing washer. This application has the effect that improves the gas tightness in cope flask and the drag flask casting process.

Description

Sand box for lost foam casting

Technical Field

The application relates to the field of casting sand boxes, in particular to a sand box for lost foam casting.

Background

The sand box for lost foam casting is an important part in the lost foam casting process and mainly comprises a simple sand box and a complex sand box, the simple sand box can be used for casting with low requirement on the uniformity of a negative pressure field, the complex sand box is mainly used for casting with high requirement on the negative pressure field, and meanwhile, the sand box has the characteristics of good air permeability of an inner layer and good sealing performance of an outer layer.

Chinese patent No. CN207239087U discloses a sand box for casting, which comprises a cope box and a drag box, wherein the cope box extends a convex plate towards the drag box, the drag box is provided with a groove for the convex plate to be embedded in, the convex plate is arranged at two sides of the cope box in the length direction, and when the two convex plates are just matched with the groove, the drag box is just embedded between the two convex plates and is combined with the cope box.

In view of the above-mentioned related technologies, the inventor believes that the sealing performance at the joint of the cope flask and the drag flask is poor, and the defects of collapsing, air holes, shrinkage porosity and the like may be generated in the use process of the sand flask.

SUMMERY OF THE UTILITY MODEL

In order to improve the leakproofness between cope flask and the drag flask, this application provides a sand box for lost foam casting.

The application provides a sand box for lost foam casting adopts following technical scheme:

the sand box for lost foam casting comprises a cope box and a drag box, wherein the cope box is fixedly arranged above the drag box, a first annular groove is formed in the upper wall of the drag box, a second annular groove is formed in one end, connected with the drag box, of the cope box, a first sealing and heat insulation device is arranged in the first annular groove and the second annular groove, and the heat insulation device is arranged on the inner side of a first sealing ring.

By adopting the technical scheme, the sealing performance of the joint of the cope flask and the drag flask can be improved by adding the first sealing ring at the joint of the cope flask and the drag flask, and the possibility of phenomena such as collapse, air holes and shrinkage porosity in the use process of the cope flask and the drag flask is effectively reduced. The heat insulation device is arranged on the inner side of the sealing ring, so that heat transferred by sand in the cope flask and the drag flask is effectively reduced, and the service life of the sealing ring is prolonged.

Preferably, the insulation means comprises a first layer of insulation extending into the second annular groove.

Through adopting above-mentioned technical scheme, during first insulating layer extended to the second annular groove, protected the sealing washer effectively, prolonged the life of sealing washer, during the equipment, simple to operate but first insulating layer can take place the friction with the second annular groove, causes wearing and tearing easily.

Preferably, the heat insulation device comprises a second heat insulation layer and a third heat insulation layer, the second heat insulation layer is arranged in the first annular groove, and the third heat insulation layer is arranged in the second annular groove.

Through adopting above-mentioned technical scheme, the second insulating layer is in first ring channel and sets up inboard at the sealing washer for the heat of isolated cope flask and the transfer of sand in the drag flask, a better operational environment is provided for the sealing washer, the sealing washer has further been protected to the third insulating layer in the second ring channel, second insulating layer and third insulating layer all help prolonging the life of sealing washer, need put into first ring channel and second ring channel respectively with second insulating layer and third insulating layer during the equipment, the installation is not convenient, but can not take place the friction with the second ring channel, wearing and tearing are little.

Preferably, an air exhaust cavity is formed in the lower sand box, air exhaust holes are formed in the periphery of the inner wall of the lower sand box and communicated with the air exhaust cavity, a first stainless steel filter screen is fixedly connected to the joint of the air exhaust holes and the inner wall of the lower sand box, air exhaust pipes are arranged on two sides of the lower sand box and communicated with the air exhaust cavity, and a second stainless steel filter screen is arranged at the joint of the air exhaust pipes and the air exhaust cavity.

Through adopting above-mentioned technical scheme, the inside extraction chamber that is provided with of drag flask can provide the negative pressure environment for the lost foam casting. The air exhaust holes are formed in the periphery of the inner wall of the lower sand box, so that the air exhaust efficiency can be improved, and meanwhile, the air exhaust is uniform, and a stable negative pressure environment is provided. The first stainless steel filter screen can reduce the possibility that impurities enter the exhaust pipe, and the second stainless steel filter screen can further reduce the possibility that impurities enter the exhaust pipe, so that the possibility of blockage of the exhaust pipe is effectively reduced, and the service life of the exhaust pipe is prolonged.

Preferably, a sand outlet is formed in the bottom of the drag flask, the sand outlet is communicated with the air exhaust cavity, a baffle plate used for sealing the sand outlet is arranged at the bottom of the drag flask, a brush plate and a driving device are arranged in the air exhaust cavity, the brush plate is abutted to the bottom of the air exhaust cavity, the brush plate moves along the long edge direction of the bottom of the air exhaust cavity, and the driving device drives the brush plate to move towards the sand outlet.

Through adopting above-mentioned technical scheme, the drag flask bottom sets up the sand outlet, and sand outlet and exhaust chamber intercommunication, drag flask are located sand outlet department and are equipped with the baffle, and the sand outlet can be arranged in clearing up residual impurity in the exhaust chamber, and the baffle can be used to seal the sand outlet. Set up brush board and drive arrangement again in the chamber of bleeding, the brush board is contradicted in the chamber bottom of bleeding, and the brush board removes along the long limit direction in the chamber of bleeding, and drive arrangement drive brush board removes towards the mouth that shakes out, has facilitated the clearance of impurity in the chamber of bleeding. The third sealing ring is arranged at the joint of the baffle and the air pumping cavity, so that the sealing performance of the baffle and the air pumping cavity is improved, and the possibility of collapse in the casting process is effectively reduced.

Preferably, the driving device comprises a belt wheel, a transmission belt and a crank, the belt wheel is rotatably connected to the inner wall of the air exhaust cavity, the transmission belt is arranged along the long side direction of the drag box, the transmission belt is wound on the belt wheel, two ends of the brush plate are connected with the corresponding transmission belts, one end of the belt wheel extends out of the drag box and is connected with the crank, and a second sealing ring is arranged at one end of the belt wheel extending out of the drag box.

Through adopting above-mentioned technical scheme, the band pulley rotates to be connected on the intracavity wall of bleeding, and the driving belt distributes along the drag box long limit, and the drive belt is around on the band pulley, and the band pulley rotates and drives the drive belt rotation and can make drive arrangement work. The driving device drives the brush plate to slide along the bottom of the air pumping cavity so as to clean the air pumping cavity. One end of the belt wheel extends out of the drag flask and is connected with the crank, and the belt wheel can be rotated by rotating the crank, so that the operation of the driving device is facilitated. The second sealing ring is arranged at the end, extending out of the drag flask, of the belt wheel, so that the sealing performance is improved, and the possibility of collapsing in the casting process is reduced.

Preferably, the driving device further comprises a connecting plate, the connecting plate is fixed on the transmission belt, a brush plate is connected to the connecting plate in a rotating mode, a third annular groove is formed in one side, connected with the brush plate, of the connecting plate, a first magnetic part is arranged in the third annular groove, a second magnetic part adsorbed with the first magnetic part is arranged on the side wall of the brush plate, and the brush plate is abutted to the bottom of the air suction cavity when the first magnetic part and the second magnetic part are adsorbed.

Through adopting above-mentioned technical scheme, the connecting plate is fixed on the drive belt, rotates on the connecting plate and is connected with the brush board, and the brush board rethread first magnetism spare and second magnetism spare adsorb with the third annular groove mutually, and when the drive belt moved along the long limit direction of drag flask, the brush board moved to sand outlet thereupon, cleared up remaining impurity in the exhaust chamber. Before the brush board touches the inner wall of the air exhaust cavity, the brush board always props at the bottom of the air exhaust cavity under the action of the first magnetic part and the second magnetic part, when the brush board touches the inner wall of the air exhaust cavity, the second magnetic part is separated from the third magnetic part, cleaning is finished, and therefore the moving stroke of the brush board is effectively increased, and the cleaning range is increased. After first magnetism spare and second magnetism spare separation, under the drive of drive belt, the brush board rotates along the ring channel, and when the connecting plate rotated once more and was close to the chamber bottom of bleeding, first magnetism spare and second magnetism spare adsorb mutually again, continue to clean, help utilizing the space.

Preferably, the four corners of the upper wall of the drag flask are provided with clamping blocks, the bottom surface of the cope flask is provided with a groove corresponding to the clamping blocks, and the clamping blocks are embedded into the groove when the cope flask and the drag flask are combined.

Through adopting above-mentioned technical scheme, fixture block and recess can provide the basis for the fixed of cope flask and drag flask, help aiming at cope flask and drag flask to play the effect of pre-fixing.

Preferably, the lower sand box outer wall is provided with a lower fixing seat, the lower fixing seat is provided with a circular groove, the upper sand box outer wall is provided with an upper fixing seat corresponding to the lower fixing seat, the upper fixing seat is provided with a hole corresponding to the circular groove, a pin is arranged between the upper fixing seat and the lower fixing seat, and the pin penetrates through the hole and is embedded into the circular groove.

By adopting the technical scheme, the cope flask and the drag flask are completely fixed through the pin, and the possibility of horizontal displacement of the cope flask and the drag flask is effectively reduced. Meanwhile, the connection between the cope flask and the drag flask is further reinforced.

Preferably, the lower wall of the drag flask is provided with a pulley, and the outer wall of the drag flask is provided with a handle.

Through adopting above-mentioned technical scheme, the pulley can make things convenient for the removal of drag flask, and the handle on the outer wall facilitates for the back mold after the casting.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a sealing ring and a heat insulation device are arranged between the upper sand box and the lower sand box, the sealing ring can improve the sealing property between the upper sand box and the lower sand box and is beneficial to protecting the negative pressure environment in the sand box, and the heat insulation layer can effectively prevent heat from acting on the sealing ring so as to prolong the service life of the sealing ring;

2. the side of the drag flask is provided with the sand outlet, and the crank is rotated to clean out the residual impurities in the pumping cavity, thereby facilitating the cleaning of the pumping cavity and effectively reducing the possibility that the residual casting sand is sucked into the pumping pipe.

3. The air exhaust cavity in the drag flask and the filter screens arranged on the periphery provide conditions for forming a negative pressure environment, the filter screens are arranged on the periphery, so that air in the drag flask can be uniformly exhausted, the air exhaust efficiency is improved, and the possibility of case collapse in the pouring process is effectively reduced.

Drawings

FIG. 1 is a schematic view showing the overall structure of a cope flask and a drag flask according to one embodiment of the present invention.

FIG. 2 is a schematic view showing the overall structure of the cope flask and the drag flask according to the first embodiment of the present invention.

Fig. 3 is a sectional view taken along a-a in fig. 2.

FIG. 4 is a schematic view of a connection structure between a brush plate and a transmission belt according to an embodiment of the present application.

FIG. 5 is a schematic view showing the overall structure of the cope flask and the drag flask according to the second embodiment of the present invention.

FIG. 6 is a schematic sectional view showing the cope flask and the drag flask according to the second embodiment of the present invention.

Description of reference numerals: 1. a cope flask; 101. a second annular groove; 102. a groove; 103. an upper fixed seat; 104. an aperture; 2. a drag flask; 201. a first annular groove; 202. a clamping block; 203. a lower fixed seat; 204. a circular groove; 3. a first seal ring; 4. a thermal insulation device; 41. a first insulating layer; 411. an alumina foam layer; 412. a phenolic foam layer; 42. A second thermal insulation layer; 43. a third thermal insulation layer; 5. an air pumping cavity; 501. an air exhaust hole; 6. a first stainless steel screen; 7. an air exhaust pipe; 8. a second stainless steel screen; 9. a sand outlet; 91. a baffle plate; 92. a third seal ring; 10. brushing the board; 11. a drive device; 111. a pulley; 112. a transmission belt; 113. a connecting plate; 114. a crank; 115. a second seal ring; 116. a third annular groove; 117. a first magnetic member; 118. a second magnetic member; 12. a pin; 13. a pulley; 14. a handle.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

First embodiment, this embodiment discloses a sand box for lost foam casting.

Referring to fig. 1 and 2, the sand box for lost foam casting comprises a cope flask 1, a drag flask 2 and a pulley 13, wherein the pulley 13 is arranged at the bottom of the drag flask 2 and is helpful for an operator to move the drag flask 2. When an operator casts, the cope flask 1 needs to be covered on the drag flask 2, the top of the drag flask 2 is provided with a first annular groove 201, the cope flask 1 is provided with a second annular groove 101 corresponding to the first annular groove 201, the first annular groove 201 is provided with a first sealing ring 3, the first sealing ring 3 extends into the second annular groove 101, and the inner side of the first sealing ring 3 is provided with a heat insulation device 4.

Referring to fig. 1, the heat insulation device 4 comprises a first heat insulation layer 41, the first heat insulation layer 41 mainly comprises an alumina foam layer 411 and a phenolic foam layer 412, the alumina foam layer 411 is arranged on the outer side of the phenolic foam layer 412, and the first sealing ring 3 is added to the cope flask 1 and the drag flask 2, so that the sealing performance between the cope flask 1 and the drag flask 2 can be effectively improved, and the possibility of the occurrence of the flask collapse in the casting process is reduced. The heat insulation device 4 can effectively protect the first sealing ring 3, and the alumina foam layer 411 and the phenolic foam layer 412 provide double guarantee for the first sealing ring 3, which is helpful for prolonging the service life of the first sealing ring 3. This arrangement is convenient to install but is prone to wear.

Referring to fig. 1, four corners of the top of the drag flask 2 are provided with fixture blocks 202, the bottom of the cope flask 1 is provided with grooves 102 corresponding to the fixture blocks 202, and when the cope flask 1 and the drag flask 2 are combined, the fixture blocks 202 are embedded into the grooves 102, so that the cope flask 1 and the drag flask 2 are pre-fixed.

Referring to fig. 2, the lower fixing base 203 is arranged on the outer wall of the drag flask 2, two lower fixing bases 203 are arranged on the outer wall of the drag flask 2 and symmetrically arranged on two sides of the drag flask 2, the circular groove 204 is arranged on the lower fixing base 203, the upper fixing base 103 corresponding to the lower fixing base 203 is arranged on the outer wall of the cope flask 1, the hole 104 corresponding to the circular groove 204 is arranged on the upper fixing base 103, the pin 12 is arranged between the upper fixing base 103 and the lower fixing base 203, the pin 12 penetrates through the hole 104 and is embedded into the circular groove 204, the pin 12 enables the connection between the cope flask 1 and the drag flask 2 to be more stable, and the possibility of horizontal displacement between the cope flask 1 and the drag flask 2 is effectively reduced, so that the possibility of collapse in the casting process is reduced.

Referring to fig. 2 and 3, an air exhaust cavity 5 is formed in the drag flask 2, in order to improve the air exhaust effect, air exhaust holes 501 are formed around the inner wall of the drag flask 2, the air exhaust holes 501 are communicated with the air exhaust cavity 5, an air exhaust pipe 7 is arranged on the outer wall of the drag flask 2, one end of the air exhaust pipe 7 is communicated with the air exhaust cavity 5, the other end of the air exhaust pipe is connected with air exhaust equipment, a first stainless steel filter screen 6 is fixed at the joint of the air exhaust holes 501 and the air exhaust cavity 5 through bolts, and a second stainless steel filter screen 8 is arranged at the joint of the air exhaust pipe 7 and the air exhaust cavity 5. When the operator casts, the operator starts the air extraction equipment, and provides a good negative pressure environment for casting through the air extraction holes 501, the air extraction cavity 5 and the air extraction pipe 7. The first stainless steel filter screen 6 and the second stainless steel filter screen 8 can filter the impurities pumped out during air pumping, effectively reduce the impurities sucked into the air pumping pipe 7, effectively reduce the possibility of blockage of the air pumping pipe 7 and prolong the service life of the air pumping pipe 7.

Referring to fig. 2, a handle 14 is provided on the outer wall of the drag flask 2, and after casting is completed, the handle 14 is lifted to perform mold stripping.

Referring to fig. 3, the bottom of the drag flask 2 is provided with a sand outlet 9, and the sand outlet 9 is communicated with the air pumping cavity 5, so that the impurities remained in the air pumping cavity 5 can be cleaned conveniently. The lower sand box 2 is provided with a baffle plate 91 at the sand outlet 9, the baffle plate 91 is fixed at the bottom of the lower sand box 2 through bolts, the baffle plate 91 covers the sand outlet 9, and a third sealing ring 92 is arranged on one surface of the baffle plate 91 close to the lower sand box 2, so that the sealing performance of the baffle plate 91 and the lower sand box 2 is improved, and the possibility of collapse in the casting process is reduced.

Referring to fig. 3, a brush plate 10 and a driving device 11 are arranged inside the air exhaust cavity 5, the brush plate 10 abuts against the bottom of the air exhaust cavity 5, the brush plate 10 moves along the long side direction of the air exhaust cavity 5, and the driving device 11 drives the brush plate 10 to move towards the sand outlet 9 so as to clean impurities remained in the air exhaust cavity 5. Drive arrangement 11 includes band pulley 111 and drive belt 112, and drive belt 112 sets up and winds on band pulley 111 along the long edge direction in extraction cavity 5, and extraction cavity 5 inner wall both sides all have drive belt 112, and band pulley 111 rotates and to make drive belt 112 rotate, has made things convenient for brush board 10 to clear up extraction cavity 5.

Referring to fig. 3 and 4, a connecting plate 113 is fixedly connected to the transmission belt 112, the brush plate 10 is rotatably disposed on the connecting plate 113, a third annular groove 116 is formed in a side of the connecting plate 113 close to the brush plate 10, a first magnetic member 117 is disposed in the third annular groove 116, a second magnetic member 118 corresponding to the first magnetic member 117 is disposed on the brush plate 10, when the first magnetic member 117 and the second magnetic member 118 are attracted to each other, the brush plate 10 abuts against the bottom of the air pumping cavity 5, and the transmission belt 112 drives the brush plate 10 to move toward the sand outlet 9 to clean impurities remaining in the air pumping cavity 5 when rotating. When the brush plate 10 abuts against the inner wall of the suction chamber 5, the first magnetic member 117 separates from the second magnetic member 118, and the cleaning is completed, which effectively increases the moving distance of the brush plate 10 and thus increases the cleaning range. After the first magnetic member 117 is separated from the second magnetic member 118, the brush plate 10 is driven by the driving belt 112 to rotate along the third annular groove 116, and when the connecting plate 113 rotates to be close to the bottom of the pumping cavity 5 again, the first magnetic member 117 and the second magnetic member 118 are adsorbed again to continue cleaning, which is helpful for utilizing space.

Referring to fig. 2 and 3, one end of the pulley 111 extends out of the drag flask 2 and is connected with the crank 114, the crank 114 is rotated to rotate the pulley 111, and the pulley 111 drives the transmission belt 112 to move along the long side direction of the pumping cavity 5, so that the brush plate 10 can clean impurities left in the pumping cavity 5 more conveniently. The third sealing ring 92 is arranged at the joint of the crank handle 114 and the drag flask 2, so that the sealing performance of the crank handle 114 and the drag flask 2 is improved, and the possibility of collapsing in the casting process is effectively reduced.

The implementation principle of the sand box for the lost foam casting of the first embodiment is as follows: before casting, the operator pushes the drag flask 2 into a predetermined place, and inserts the first seal ring 3 into the first annular groove 201 formed in the top of the drag flask 2, and the first seal ring 3 extends to the second annular groove 101 in the bottom of the cope flask 1. A first heat insulation layer 41 is arranged on the inner side of the first sealing ring 3, the first heat insulation layer 41 extends into a second annular groove 101 formed in the bottom of the cope flask 1, and the first heat insulation layer 41 can provide protection for the first sealing ring 3.

The cope flask 1 and the drag flask 2 are pre-fixed through the fixture block 202 at the top of the cope flask 1 and the groove 102 at the bottom of the drag flask 2, the pin 12 penetrates through the hole 104 of the upper fixing seat 103 and is embedded into the circular groove 204 of the lower fixing seat 203, the cope flask 1 and the drag flask 2 are completely fixed, and the possibility of horizontal displacement of the cope flask 1 and the drag flask 2 is effectively reduced.

After fixing the cope flask 1 and the drag flask 2, an operator puts a mold and casting sand into the flask, the operator starts the air extractor, the air extraction holes 501 on the periphery of the inner wall of the drag flask 2 can provide an even negative pressure environment and can effectively increase the air extraction efficiency, in the air extraction process, the first stainless steel filter screen 6 and the second stainless steel filter screen 8 filter impurities in the casting sand, the possibility of blockage of the air extraction pipe 7 is reduced, and the service life of the air extraction pipe 7 is prolonged.

After the casting is completed and cooled, the operator takes out the pin 12, separates the cope flask 1 from the drag flask 2, hooks the handle 14 with the hook, pours out the casting sand in the flask, and takes out the finished product. After the finished product is taken out, the baffle plate 91 at the bottom of the lower sand box 2 is taken down to expose the sand outlet 9, and the impurities remained in the air pumping cavity 5 are prepared to be cleaned.

The operator can rotate the handle to move the brush plate 10 along the long side direction of the air pumping cavity 5, thereby finishing the cleaning of the air pumping cavity 5. Before the brush plate 10 abuts against the inner wall of the air exhaust cavity 5, the first magnetic member 117 and the second magnetic member 118 are attracted to each other, so that the brush plate 10 always abuts against the bottom of the air exhaust cavity 5, which helps to ensure the cleaning effect of the brush plate 10. When the brush plate 10 abuts against the inner wall of the pumping cavity 5, cleaning is finished, the crank 114 is continuously rotated to separate the first magnetic member 117 from the second magnetic member 118, the brush plate 10 is driven by the driving belt 112 to rotate along the annular groove, and when the connecting plate 113 is rotated again to be close to the bottom of the pumping cavity 5, the first magnetic member 117 and the second magnetic member 118 are adsorbed again to be continuously cleaned, which is beneficial to utilizing space. After the cleaning is finished, the baffle plate 91 is fixed on the drag flask 2 through bolts and blocks the sand outlet 9.

Example two

Referring to fig. 5 and 6, in the present embodiment 2, unlike the first embodiment, the second heat insulation layer 42 is disposed in the first annular groove 201 at the top of the drag flask 2, the third heat insulation layer 43 is disposed in the second annular groove 101 at the bottom of the drag flask 1, the second heat insulation layer 42 and the third heat insulation layer 43 are disposed outside the first seal ring 3, the second heat insulation layer 42 and the third heat insulation layer 43 are disposed outside the alumina foam layer 411 and the phenolic foam layer 412, and the alumina foam layer 411 is disposed outside the phenolic foam layer 412, so as to provide protection for the first seal ring 3, and effectively prolong the service life of the first seal ring 3. When the heat-insulating device is installed, the second heat-insulating layer 42 and the third heat-insulating layer 43 need to be respectively placed in the first annular groove 201 and the second annular groove 101, the operation is inconvenient, friction with the second annular groove 101 cannot occur, and the abrasion is small.

The implementation principle of the second embodiment is as follows: the first sealing ring 3 and the second heat insulation layer 42 are arranged in the first annular groove 201 at the top of the drag flask 2, the third heat insulation layer 43 is arranged in the second annular groove 101 at the bottom of the cope flask 1, and the second heat insulation layer 42 and the third heat insulation layer 43 are both arranged on the inner side of the first sealing ring 3 to protect the first sealing ring 3.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a sand box is used in lost foam casting, includes cope flask (1) and drag flask (2), cope flask (1) is fixed to be set up in drag flask (2) top, its characterized in that: a first annular groove (201) is formed in the upper wall of the drag flask (2), a second annular groove (101) is formed in one end, connected with the drag flask (2), of the cope flask (1), a first sealing ring (3) and a heat insulation device (4) are arranged in the first annular groove (201) and the second annular groove (101), and the heat insulation device (4) is arranged on the inner side of the first sealing ring (3).

2. The sand box for lost foam casting according to claim 1, wherein: the heat insulation device (4) comprises a first heat insulation layer (41), wherein the first heat insulation layer (41) extends into the second annular groove (101).

3. The sand box for lost foam casting according to claim 1, wherein: the heat insulation device (4) further comprises a second heat insulation layer (42) and a third heat insulation layer (43), the second heat insulation layer (42) is arranged in the first annular groove (201), and the third heat insulation layer (43) is arranged in the second annular groove (101).

4. The sand box for lost foam casting according to claim 1, wherein: the inside air suction chamber (5) of having seted up of drag flask (2), be equipped with aspirating hole (501) around drag flask (2) inner wall, aspirating hole (501) are linked together with air suction chamber (5), the first stainless steel filter screen of junction fixedly connected with (6) of aspirating hole (501) and drag flask (2) inner wall, drag flask (2) both sides are equipped with exhaust tube (7), exhaust tube (7) and air suction chamber (5) intercommunication just are equipped with second stainless steel filter screen (8) in the junction.

5. The sand box for lost foam casting according to claim 4, wherein: the utility model discloses a sand-pumping device, including drag flask (2), sand outlet (9) are equipped with bottom sand box (2), sand outlet (9) are linked together with extraction chamber (5), drag flask (2) bottom is equipped with baffle (91) that are used for sealing sand outlet (9), be equipped with brush board (10) and drive arrangement (11) in extraction chamber (5), brush board (10) are contradicted in extraction chamber (5) bottom, brush board (10) slide along the long limit direction in extraction chamber (5) bottom and set up, drive arrangement (11) drive brush board (10) move towards extraction opening (9).

6. The sand box for lost foam casting according to claim 5, wherein: the driving device (11) comprises a belt wheel (111), a transmission belt (112) and a crank (114), the belt wheel (111) is rotatably connected to the inner wall of the air suction cavity (5), the transmission belt (112) is arranged along the long side direction of the drag flask (2), the transmission belt (112) is wound on the belt wheel (111), the brush plate (10) is connected with the transmission belt (112), one end of the belt wheel (111) extends out of the drag flask (2) and is connected with the crank (114), and a second sealing ring (115) is arranged at one end of the belt wheel (111) extending out of the drag flask (2).

7. The sand box for lost foam casting according to claim 6, wherein: drive arrangement (11) still includes connecting plate (113), connecting plate (113) are fixed on drive belt (112), it is connected with brush board (10) to rotate on connecting plate (113), the one side that connecting plate (113) and brush board (10) are connected is equipped with third ring channel (116), be equipped with first magnetic part (117) in third ring channel (116), the lateral wall of brush board (10) is equipped with second magnetic part (118) of adsorbing mutually with first magnetic part (117), first magnetic part (117) adsorb mutually with second magnetic part (118) when brush board (10) are contradicted when aspirating chamber (5) bottom.

8. The sand box for lost foam casting according to claim 1, wherein: the four corners of the upper wall of the lower sand box (2) are provided with clamping blocks (202), the bottom surface of the upper sand box (1) is provided with grooves (102) corresponding to the clamping blocks (202), and the clamping blocks (202) are embedded into the grooves (102) when the upper sand box (1) and the lower sand box (2) are combined.

9. The sand box for lost foam casting according to claim 1, wherein: the outer wall of the drag flask (2) is provided with a lower fixing seat (203), the lower fixing seat (203) is provided with a circular groove (204), the outer wall of the cope flask (1) is provided with an upper fixing seat (103) corresponding to the lower fixing seat (203), the upper fixing seat (103) is provided with a hole (104) corresponding to the circular groove (204), a pin (12) is arranged between the upper fixing seat (103) and the lower fixing seat (203), and the pin (12) penetrates through the hole (104) and is embedded into the circular groove (204).

10. The sand box for lost foam casting according to claim 1, wherein: the lower wall of the lower sand box (2) is provided with a pulley (13), and the outer wall of the lower sand box (2) is provided with a handle (14).

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