Elbow sand core anti-floating device and elbow casting process

Abstract

The elbow sand core anti-floating device comprises a lower shell and an upper shell, shape shells are fixedly arranged in the lower shell and the upper shell, pouring gates are arranged on one side of the lower shell and one side of the upper shell, and the pouring gates communicate with the interiors of the shape shells. After molten iron is injected into a cavity, cooling liquid in a first storage box and a second storage box in the upper shell is input into a second arc-shaped block in the upper shell through a first conveying pipe and a second conveying pipe, so that the molten iron is conveniently cooled, and curing forming is accelerated; and a first blocking plate in the first storage box and a second blocking plate in the second storage box can be controlled to move through a switch assembly, cooling liquid in the upper shell conveniently flows into a second arc-shaped block in the lower shell through an arranged butt joint pipe and a notch, and cooling of molten iron is conveniently accelerated.

Description

Technical Field

[0001] The invention relates to the field of sand casting devices, in particular to an elbow sand core anti-floating device and an elbow casting process. Background Art

[0002] For sand casting of bent pipes, conventional core heads are generally used. After the core is placed, the sand core itself will tilt into the cavity under the action of gravity. In addition, when molten steel is injected into the cavity, the sand core will float upward due to the buoyancy of the molten steel. Due to these two reasons, the wall thickness of the casting will be uneven.

[0003] The prior art can refer to the Chinese authorized invention patent with publication number CN209110135U. The prior art is specifically a sand box and a sand core for sand casting of curved pipes. The sand box includes an upper sand box and a lower sand box. The upper sand box is provided with more than two sand shooting holes. The upper sand box is provided with an exhaust hole and a gate. The gate is connected with the runner. The upper sand box is provided with an upper cavity. The lower sand box is provided with a lower cavity. The sand core includes an upper sand core and a lower sand core. The upper sand core and the lower sand core are respectively provided with a forming core bone. The two ends of the forming core bone pass through the two ends of the upper sand core and the lower sand core respectively. The two ends of the forming core bone are respectively welded to the inner wall of the sand box. The two ends of the upper sand core are respectively provided with a rectangular core head 1, and the two ends of the lower sand core are respectively provided with a rectangular core head 2. An upper sand mold is provided between the upper sand box and the upper cavity, and a lower sand mold is provided between the lower sand box and the lower cavity. The prior art mainly does not need to use a core support, which can effectively prevent the sand core from tilting and floating.

[0004] Although the above-mentioned prior art can fix the sand core in actual implementation, fixing the sand core by sand requires a lot of sand to be filled in the box, which affects the cooling efficiency of the molten iron and causes a slow solidification and molding speed. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes an elbow sand core anti-floating device and an elbow casting process to solve the above problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides an elbow sand core anti-floating device and an elbow casting process, comprising: a lower shell and an upper shell, wherein a shape shell is fixedly arranged inside the lower shell and the upper shell, and a runner is arranged on one side of the lower shell and the upper shell, and the runner is connected to the inside of the shape shell;

[0007] Two support blocks are disposed inside the lower shell and the upper shell, and the two support blocks are respectively located at two ends of the shell, and a first arc block is disposed on the top of the support block, and a sand core is disposed inside one of the shells, and the first arc block contacts the outer wall of the sand core;

[0008] The first storage box and the second storage box are respectively arranged on both sides of the interior of the lower shell and the upper shell, and the first storage box and the second storage box are both provided with water injection ports, and coolant is arranged inside one of the first storage box and the second storage box, and a support box is arranged inside the lower shell and the upper shell, and a second arc block with a hollow interior is arranged on the top of the support box, and square tubes are connected on both sides of the bottom of the second arc block, the first storage box is connected with one of the square tubes through a first conveying pipe, and the second storage box is connected with the other square tube through a second conveying pipe, and two butt joint tubes are arranged at the other end of one of the second arc blocks, and two grooves matched with the butt joint tubes are arranged at the other end of the other second arc block.

[0009] Further, a first communicating groove is provided inside the first storage box, one end of which is communicated with the first delivery pipe, a first blocking plate for blocking the first communicating groove is slidably provided inside the first storage box, a second communicating groove communicating with the second delivery pipe is provided inside the second storage box, and a second blocking plate for blocking the second communicating groove is slidably provided inside the second storage box;

[0010] A switch assembly is arranged inside the lower shell and the supporting box to push the first blocking plate and the second blocking plate to move.

[0011] Further, both sides of the lower shell and the upper shell are provided with a first slide groove and a second slide groove, the switch assembly includes an active push plate slidably arranged inside the first slide groove, a passive plate slidably arranged inside the second slide groove, a third linkage bar, a power mechanism arranged inside the support box, and a transmission mechanism connecting the power mechanism and the active push plate, and the first slide groove provided on one side of the lower shell is vertically opposite to the second slide groove provided on one side of the upper shell;

[0012] A second channel groove is provided inside the lower shell and the upper shell, a third linkage bar is slidably arranged inside the second channel groove, a first push rod and a second push rod are respectively provided at both ends of the third linkage bar, one end of the first push rod extends to the inside of the first storage box and is connected to the first blocking plate, and one end of the second push rod extends to the inside of the second storage box and is connected to the second blocking plate;

[0013] One end of the passive board is connected to the third linkage bar.

[0014] Furthermore, a first spring is disposed inside the first slide groove and the second slide groove, and the first spring is connected to the active push plate and the passive plate.

[0015] Further, the power mechanism includes a heat-conducting member arranged inside the supporting box, a ball block arranged inside the lower shell and the upper shell, and a telescopic member arranged on one side of the ball block, wherein compressed gas is arranged inside the ball block, one end of the heat-conducting member contacts the inner top wall of the second arc-shaped block, the other end of the heat-conducting member extends to the inside of the ball block, and the telescopic member is connected to the inside of the ball block;

[0016] One end of the telescopic member is connected to the transmission mechanism.

[0017] Further, the transmission mechanism includes a first channel groove opened inside the lower shell and the upper shell, and a first linkage bar slidably arranged inside the first channel groove;

[0018] One end of the first linkage bar is connected to the telescopic member, and the other end of the first linkage bar extends to the inside of the first sliding groove and is connected to the active push plate.

[0019] Further, the heat conducting member comprises a sleeve copper block fixedly mounted on the bottom of the supporting box, a connecting copper sheet slidably arranged inside the sleeve copper block, and a first arc-shaped copper sheet arranged on the top of the connecting copper sheet, wherein the first arc-shaped copper sheet contacts the inner wall of the second arc-shaped block;

[0020] The bottom of the sleeve copper block extends to the interior of the ball block and is connected to a heating copper sheet, and the bottom of the heating copper sheet is connected to a semicircular copper sheet.

[0021] Furthermore, the telescopic member includes a fixed cylinder installed on the outer wall of the ball block and connected to the interior of the ball block, a movable cylinder slidably arranged inside the fixed cylinder, and a sealing disk fixedly installed on one end of the movable cylinder, and the other end of the movable cylinder extends out of the interior of the fixed cylinder and is connected to the transmission mechanism.

[0022] Furthermore, two sealing cylinders are arranged inside the second arc block, and a copper strip is arranged inside the sealing cylinder. One end of the copper strip extends to the inside of the shell where a second arc-shaped copper sheet is provided, and the other end of the copper strip extends out of the inside of the second arc block. Two hollow blocks are arranged at the bottom of the second arc block, and a socket box is arranged on the top of the hollow block, and an insertion strip is slidably arranged inside the socket box. A rotating stopper is arranged on one side of the interior of the square tube for rotation through a torsion spring, and a groove matching the insertion strip is provided on one end of the rotating stopper close to the insertion strip, a connecting baffle is fixedly arranged inside the square tube, and a movable baffle is hinged at one end of the connecting baffle, and the movable baffle is located above the rotating stopper, one end of the copper strip extends to the inside of the hollow block, and a second spring is arranged on the inner top of the hollow block, and one end of the second spring is connected to one end of the insertion strip.

[0023] A pipe bending casting process comprises the following steps:

[0024] Step 1: Separate the lower shell from the upper shell, and then place the sand core onto the two first arc-shaped blocks inside the lower shell;

[0025] Step 2: Close the lower shell and the upper shell to make the two shells close to each other, and then inject iron liquid into the cavity formed by the two shells being connected through the pouring channel;

[0026] Step 3: After the iron liquid inside the cavity is cooled and formed, the lower shell and the upper shell are separated, and the formed bent pipe is taken out.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. After the molten iron is injected into the cavity, the coolant in the first storage box and the second storage box in the upper shell is input into the second arc-shaped block in the upper shell through the first delivery pipe and the second delivery pipe, so as to cool down the molten iron and accelerate the solidification and molding. The first sealing plate in the first storage box and the second sealing plate in the second storage box can be controlled to move through the switch assembly. The connecting pipe and the groove are provided to facilitate the coolant in the upper shell to flow to the second arc-shaped block in the lower shell, so as to accelerate the cooling of the molten iron.

[0029] Second, after the molten iron is injected, the heat of the molten iron can be conducted to the heat-conducting part through the contact between the second arc block and the shell, and then the heat is conducted to the inside of the ball block through the heat-conducting part, so as to heat the compressed gas inside the ball block, so that the compressed gas expands and enters the telescopic part, drives the telescopic part to move, and drives the transmission mechanism to move through the telescopic part, and finally drives the third linkage bar to move through the transmission mechanism, so as to realize the connection between the first delivery pipe and the first storage box, and the connection between the second delivery pipe and the inside of the second storage box, so that the coolant enters the inside of the second arc block, so as to facilitate the cooling of the molten iron.

[0030] 3. Heat can be conducted to the sleeve copper block through the first arc-shaped copper sheet, and then the compressed gas inside the ball block is heated by the heating copper sheet and the semicircular copper sheet. The heated gas expands and enters the interior of the fixed cylinder, and the moving copper is pushed to move by the air pressure, and then the transmission mechanism is driven to move through the moving cylinder, thereby achieving the purpose of automatically releasing the coolant, and the coolant flows from the upper shell to the lower shell, which makes it easier to take away heat during the flow.

[0031] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a first three-dimensional mechanism of the present invention;

[0033] Figure 2 is a schematic diagram of a second three-dimensional mechanism of the present invention;

[0034] Figure 3 It is a schematic diagram of the internal structure of the lower housing in the present invention;

[0035] Figure 4 It is a schematic diagram of the mechanism of the support box in the present invention;

[0036] Figure 5 It is a schematic diagram of the mechanism of sleeve copper blocks in the present invention;

[0037] Figure 6 is a cross-sectional view of the sleeve copper block in the present invention;

[0038] Figure 7 The present invention is attached Figure 6 A magnified view of middle;

[0039] Figure 8 It is a partial structural diagram of the lower housing in the present invention;

[0040] Fig. 9 The present invention is attached Figure 8 Enlarged view of middle B;

[0041] Fig.10 is a cross-sectional view of the first storage box of the present invention;

[0042] Fig.11 It is a schematic diagram of the mechanism of the third linkage bar in the present invention;

[0043] Fig.12 It is a local structure of the second arc block in the present invention;

[0044] Fig.13 The present invention is attached Fig.12 Enlarged view of C in the middle.

[0045] In the figure: 1, lower shell; 2, upper shell; 3, runner; 4, first heat sink fin; 5, second heat sink fin; 6, shell; 7, first arc block; 8, sand core; 9, second arc block; 10, butt tube; 11, first slide; 12, second slide; 13, active push plate; 14, passive plate; 15, first storage box; 16, second storage box; 17, support box; 18, support block; 19, first conveying pipe; 20, second conveying pipe; 21, first arc copper sheet; 22, connecting copper sheet; 23, sleeve copper block; 24, ball block; 25, fixed cylinder; 26, heating copper sheet; 27, semi- Round copper sheet; 28, moving cylinder; 29, blocking disk; 30, first channel groove; 31, first linkage bar; 32, first spring; 33, second linkage bar; 34, first connecting groove; 35, second connecting groove; 36, first blocking plate; 37, second blocking plate; 38, second channel groove; 39, third linkage bar; 40, first push rod; 41, second push rod; 42, second arc-shaped copper sheet; 43, copper bar; 44, sealing cylinder; 45, hollow block; 46, second spring; 47, socket box; 48, insert; 49, rotating block; 50, movable baffle; 51, connecting baffle; 52, square tube. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific implementation methods of the present invention are now described with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0047] Reference Figure 1-13 As shown, an elbow sand core anti-floating device and an elbow casting process include: a lower shell 1 and an upper shell 2 are arranged opposite to each other, a shape shell 6 is fixedly arranged inside the lower shell 1 and the upper shell 2, a runner 3 is arranged on one side of the lower shell 1 and the upper shell 2, and the runner 3 is connected to the inside of the shape shell 6;

[0048] Two support blocks 18 are disposed inside the lower shell 1 and the upper shell 2. The two support blocks 18 are respectively located at the two ends of the shell 6. A first arc block 7 is disposed on the top of the support block 18. A sand core 8 is disposed inside one of the shells 6. The first arc block 7 contacts the outer wall of the sand core 8.

[0049] A first storage box 15 and a second storage box 16 are respectively provided on both sides of the interior of the lower shell 1 and the upper shell 2. The first storage box 15 and the second storage box 16 are both provided with water injection ports. Cooling liquid is provided inside one of the first storage box 15 and the second storage box 16. A support box 17 is provided inside the lower shell 1 and the upper shell 2. A second arc block 9 with a hollow interior is provided on the top of the support box 17. The second arc block 9 contacts the outer wall of the shell 6. The first storage box 15 is connected to one end of the second arc block 9 through a first conveying pipe 19. The second storage box 16 is connected to one end of the second arc block 9 through a second conveying pipe 20. Two butt joints 10 are provided at the other end of one of the second arc blocks 9, and two notches matched with the butt joints 10 are provided at the other end of the other second arc block 9.

[0050] A first connecting groove 34 is provided inside the first storage box 15, one end of which is connected to the first delivery pipe 19, a first blocking plate 36 for blocking the first connecting groove 34 is slidably provided inside the first storage box 15, a second connecting groove 35 connected to the second delivery pipe 20 is provided inside the second storage box 16, a second blocking plate 37 for blocking the second connecting groove 35 is slidably provided inside the second storage box 16;

[0051] A switch assembly is arranged inside the lower shell 1 and the supporting box 17 to push the first blocking plate 36 and the second blocking plate 37 to move.

[0052] The present invention provides a technical solution. When in use, the lower shell 1 and the upper shell 2 are connected to each other, and then the molten iron is injected into the interior of the mold shell 6 through the runner 3 for casting. The sand core 8 can be clamped and fixed by the support block 18 and the first arc block 7 to prevent the sand core 8 from floating and shifting during the casting process. After the molten iron is injected into the molding cavity, the coolant in the first storage box 15 and the second storage box 16 inside the upper shell 2 is input into the second arc block 9 inside the upper shell 2 through the first delivery pipe 19 and the second delivery pipe 20, so as to cool down the molten iron and accelerate the solidification molding. The first sealing plate 36 inside the first storage box 15 and the second sealing plate 37 inside the second storage box 16 can be controlled to move through the switch assembly. The docking pipe 10 and the groove are provided to facilitate the coolant inside the upper shell 2 to flow to the second arc block 9 inside the lower shell 1, so as to accelerate the cooling of the molten iron, and then enter the first storage box 15 and the second storage box 16 inside the lower shell 1 for storage. When used next time, the lower shell 1 and the upper shell 2 are turned upside down to allow the coolant to flow.

[0053] Preferably: both sides of the lower shell 1 and the upper shell 2 are provided with a first slide groove 11 and a second slide groove 12, the switch assembly comprises an active push plate 13 slidably arranged inside the first slide groove 11, a passive plate 14 slidably arranged inside the second slide groove 12, a third linkage bar 39, a power mechanism arranged inside the support box 17, and a transmission mechanism connecting the power mechanism and the active push plate 13, the first slide groove 11 opened on one side of the lower shell 1 and the second slide groove 12 opened on one side of the upper shell 2 are opposite to each other up and down;

[0054] A second channel groove 38 is provided inside the lower shell 1 and the upper shell 2, and a third linkage bar 39 is slidably arranged inside the second channel groove 38. A first push rod 40 and a second push rod 41 are provided at both ends of the third linkage bar 39, one end of the first push rod 40 extends to the inside of the first storage box 15 and is connected to the first blocking plate 36, and one end of the second push rod 41 extends to the inside of the second storage box 16 and is connected to the second blocking plate 37;

[0055] One end of the passive plate 14 is connected to the third linkage bar 39;

[0056] A first spring 32 is disposed inside the first slide groove 11 and the second slide groove 12 . The first spring 32 is connected to the active push plate 13 and the passive plate 14 .

[0057] Specifically, after the upper shell 2 is docked with the lower shell 1, the active push plate 13 is inserted into the second slide groove 12 and is located on one side of the passive plate 14. The active push plate 13 of the lower shell 1 can push the passive plate 14 to move, and the passive plate 14 moves the third linkage bar 39 inside the second channel groove 38, and the first push rod 40 and the second push rod 41 on the third linkage bar 39 drive the first blocking plate 36 and the second blocking plate 37 to move, thereby connecting the first delivery pipe 19 to the first storage box 15, and connecting the second delivery pipe 20 to the inside of the second storage box 16, so as to facilitate the coolant to flow into the inside of the second arc block 9. The first spring 32 is provided to facilitate the active push plate 13 to automatically reset.

[0058] Preferably: the power mechanism comprises a heat-conducting member arranged inside the support box 17, a ball block 24 arranged inside the lower shell 1 and the upper shell 2, and a telescopic member arranged on one side of the ball block 24, wherein compressed gas is arranged inside the ball block 24, one end of the heat-conducting member contacts the inner top wall of the second arc-shaped block 9, and the other end of the heat-conducting member extends to the inside of the ball block 24, the telescopic member is connected to the inside of the ball block 24, and one end of the telescopic member is connected to the transmission mechanism;

[0059] The transmission mechanism includes a first channel groove 30 opened inside the lower shell 1 and the upper shell 2, and a first linkage bar 31 slidably arranged inside the first channel groove 30;

[0060] One end of the first linkage bar 31 is connected to the telescopic member, and the other end of the first linkage bar 31 extends to the inside of the first sliding groove 11 and is connected to the active push plate 13 .

[0061] Specifically, after the molten iron is injected, the heat of the molten iron can be conducted to the heat-conducting part through the contact between the second arc block 9 and the shell 6, and then the heat is conducted to the inside of the ball block 24 through the heat-conducting part, heating the compressed gas inside the ball block 24, causing the compressed gas to expand and enter the telescopic part, driving the telescopic part to move, and through the telescopic part driving the transmission mechanism to move, and finally driving the third linkage bar 39 to move through the transmission mechanism, so as to realize the connection between the first delivery pipe 19 and the first storage box 15, and the connection between the second delivery pipe 20 and the inside of the second storage box 16, so that the coolant enters the inside of the second arc block 9, which is convenient for cooling the molten iron.

[0062] Preferably: the heat conducting member comprises a sleeve copper block 23 fixedly mounted on the bottom of the support box 17, a connecting copper sheet 22 slidably arranged inside the sleeve copper block 23, and a first arc-shaped copper sheet 21 arranged on the top of the connecting copper sheet 22, and the first arc-shaped copper sheet 21 contacts the inner wall of the second arc-shaped block 9;

[0063] The bottom of the sleeve copper block 23 extends to the inside of the ball block 24 and is connected to a heating copper sheet 26, and the bottom of the heating copper sheet 26 is connected to a semicircular copper sheet 27;

[0064] The telescopic member includes a fixed cylinder 25 installed on the outer wall of the ball block 24 and connected to the interior of the ball block 24, a movable cylinder 28 slidably arranged inside the fixed cylinder 25, and a sealing disk 29 fixedly installed on one end of the movable cylinder 28, and the other end of the movable cylinder 28 extends out of the interior of the fixed cylinder 25 and is connected to the transmission mechanism.

[0065] Specifically, the heat can be transferred to the sleeve copper block 23 through the first arc-shaped copper sheet 21, and then the compressed gas inside the ball block 24 is heated by the heating copper sheet 26 and the semicircular copper sheet 27. The heated gas expands and enters the interior of the fixed cylinder 25, and the movable copper 28 is pushed to move by the air pressure, and then the transmission mechanism is driven to move by the movable cylinder 28, so as to achieve the purpose of automatically releasing the coolant, and the coolant flows from the upper shell 2 to the lower shell 1, which makes it easier to take away the heat during the flow. After the heat is reduced, the first spring 32 drives the first blocking plate 36 and the second storage box 16 to reset, seal the coolant and prevent leakage. The upper shell 2 is arranged at the bottom and the lower shell 1 is arranged at the top when used next time, so as to achieve the same effect.

[0066] Preferably: two sealing cylinders 44 are arranged inside the second arc block 9, and a copper strip 43 is arranged inside the sealing cylinder 44. One end of the copper strip 43 extends to the inside of the shell 6 where a second arc-shaped copper sheet 42 is arranged, and the other end of the copper strip 43 extends out of the inside of the second arc block 9. Two hollow blocks 45 are arranged at the bottom of the second arc block 9. A socket box 47 is arranged on the top of the hollow block 45, and a plug strip 48 is slidably arranged inside the socket box 47. A rotating stopper 49 is arranged on one side of the inner part of the square tube 52 through a torsion spring. A groove matching the plug strip 48 is provided at one end of the rotating stopper 49 close to the plug strip 48. A connecting baffle 51 is fixedly arranged inside the square tube 52, and a movable baffle 50 is hinged at one end of the connecting baffle 51. The movable baffle 50 is located above the rotating stopper 49. One end of the copper strip 43 extends to the inside of the hollow block 45. A second spring 46 is arranged on the inner top of the hollow block 45, and one end of the second spring 46 is connected to one end of the plug strip 48.

[0067] Specifically, when the coolant inside the upper shell 2 is input into the second arc block 9 through the first delivery pipe 19 and the second delivery pipe 20, the coolant enters into the second arc block 9 through the square tube 52. The coolant is squeezed inside the square tube, and under the action of water pressure, the movable baffle 50 rotates upward, and the coolant enters into the second arc block 9 through the gap generated by the rotation of the movable baffle 50. The heat inside the shell 6 is conveniently absorbed by the second arc-shaped copper sheet 42, and then conducted to the inside of the hollow block 45, so as to heat the compressed gas inside the hollow clamping block 45, and push the insert 48 outward by air pressure, so that the insert 48 is inserted into the rotating block 49, so that the rotating block 49 cannot rotate. At this time, the movable baffle 50 can only rotate in one direction, so that the coolant can only enter the second arc-shaped block 9 and cannot flow downward from the second arc-shaped block 9, thereby extending the time of the coolant inside the second arc-shaped block 9 and facilitating cooling. After cooling and forming, the temperature of the shell 6 drops, and the air pressure inside the hollow block 45 decreases. At this time, the second spring 46 drives the insert 48 to reset, and the rotating block 49 can rotate after resetting. Under the action of the gravity of the coolant, the downward pressure drives the movable baffle 50 and the rotating block 49 to rotate downward, thereby generating a gap, so that the coolant enters the first delivery pipe 19 and the second delivery pipe 20, and then is further input into the first storage box 15 and the second storage box 16.

[0068] A pipe bending casting process, characterized in that it comprises the following steps:

[0069] Step 1: Separate the lower shell 1 from the upper shell 2, and then place the sand core 8 onto the two first arc-shaped blocks 7 inside the lower shell 1;

[0070] Step 2: close the lower shell 1 and the upper shell 2 so that the two shells 6 are closed to each other, and then inject the molten iron into the cavity formed by the two shells 6 being butted together through the runner 3;

[0071] Step 3: After the molten iron in the cavity is cooled and formed, the lower shell 1 and the upper shell 2 are separated, and the formed bent pipe is taken out.

[0072] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An anti-floating device for an elbow sand core, comprising a lower shell (1) and an upper shell (2) arranged opposite to each other, characterized in that: A mold shell (6) is fixedly arranged inside the lower shell (1) and the upper shell (2), and a runner (3) is arranged on one side of the lower shell (1) and the upper shell (2), and the runner (3) is communicated with the inside of the mold shell (6); Two support blocks (18) are arranged inside the lower shell (1) and the upper shell (2), and the two support blocks (18) are respectively located at two ends of the shell (6), and a first arc block (7) is arranged on the top of the support block (18), and a sand core (8) is arranged inside one of the shells (6), and the first arc block (7) is in contact with the outer wall of the sand core (8); A first storage box (15) and a second storage box (16) are respectively arranged on both sides of the interior of the lower shell (1) and the upper shell (2); the first storage box (15) and the second storage box (16) are both provided with water injection ports; a cooling liquid is arranged inside one of the first storage box (15) and the second storage box (16); a support box (17) is arranged inside the lower shell (1) and the upper shell (2); a second arc block (9) with a hollow interior is arranged on the top of the support box (17); the second arc block ( 9) is in contact with the outer wall of the shell (6), the bottom sides of the second arc block (9) are connected with square tubes (52), the first storage box (15) is connected with one of the square tubes (52) through a first conveying pipe (19), the second storage box (16) is connected with the other square tube (52) through a second conveying pipe (20), the other end of one of the second arc blocks (9) is provided with two butt joints (10), and the other end of the other second arc block (9) is provided with two notches matched with the butt joints (10).

2. The anti-floating device for elbow sand core according to claim 1, characterized in that: A first communicating groove (34) is provided inside the first storage box (15), one end of the first communicating groove (34) is communicated with the first delivery pipe (19), a first blocking plate (36) is slidably provided inside the first storage box (15) for blocking the first communicating groove (34), a second communicating groove (35) is provided inside the second storage box (16) for communicating with the second delivery pipe (20), and a second blocking plate (37) is slidably provided inside the second storage box (16) for blocking the second communicating groove (35); A switch assembly is arranged inside the lower housing (1) and the supporting box (17) for pushing the first blocking plate (36) and the second blocking plate (37) to move.

3. The anti-floating device for elbow sand core according to claim 2, characterized in that: A first slide groove (11) and a second slide groove (12) are provided on both sides of the lower shell (1) and the upper shell (2); the switch assembly comprises an active push plate (13) slidably arranged inside the first slide groove (11), a passive plate (14) slidably arranged inside the second slide groove (12), a third linkage bar (39), a power mechanism arranged inside the support box (17), and a transmission mechanism connecting the power mechanism and the active push plate (13); the first slide groove (11) provided on one side of the lower shell (1) and the second slide groove (12) provided on one side of the upper shell (2) are opposite to each other in upper and lower directions; A second channel groove (38) is provided inside the lower shell (1) and the upper shell (2), a third linkage bar (39) is slidably arranged inside the second channel groove (38), a first push rod (40) and a second push rod (41) are respectively provided at two ends of the third linkage bar (39), one end of the first push rod (40) extends to the inside of the first storage box (15) and is connected to the first blocking plate (36), and one end of the second push rod (41) extends to the inside of the second storage box (16) and is connected to the second blocking plate (37); One end of the passive plate (14) is connected to the third linkage bar (39).

4. The anti-floating device for elbow sand core according to claim 3, characterized in that: A first spring (32) is disposed inside the first slide groove (11) and the second slide groove (12), and the first spring (32) is connected to the active push plate (13) and the passive plate (14).

5. The anti-floating device for elbow sand core according to claim 3, characterized in that: The power mechanism comprises a heat-conducting member arranged inside the supporting box (17), a ball block (24) arranged inside the lower shell (1) and the upper shell (2), and a telescopic member arranged on one side of the ball block (24); compressed gas is provided inside the ball block (24); one end of the heat-conducting member contacts the inner top wall of the second arc-shaped block (9); the other end of the heat-conducting member extends to the inside of the ball block (24); and the telescopic member is in communication with the inside of the ball block (24); One end of the telescopic member is connected to the transmission mechanism.

6. The anti-floating device for elbow sand core according to claim 5, characterized in that: The transmission mechanism comprises a first channel groove (30) provided inside the lower housing (1) and the upper housing (2), and a first linkage bar (31) slidably arranged inside the first channel groove (30); One end of the first linkage bar (31) is connected to the telescopic member, and the other end of the first linkage bar (31) extends to the inside of the first sliding groove (11) and is connected to the active push plate (13).

7. The anti-floating device for elbow sand core according to claim 5, characterized in that: The heat conducting member comprises a sleeve copper block (23) fixedly mounted on the inner bottom of the supporting box (17), a connecting copper sheet (22) slidably arranged inside the sleeve copper block (23), and a first arc-shaped copper sheet (21) arranged on the top of the connecting copper sheet (22), wherein the first arc-shaped copper sheet (21) contacts the inner wall of the second arc-shaped block (9); The bottom of the sleeve copper block (23) extends to the interior of the ball block (24) and is connected to a heating copper sheet (26), and the bottom of the heating copper sheet (26) is connected to a semicircular copper sheet (27).

8. The elbow sand core anti-floating device according to claim 5, characterized in that: The telescopic member comprises a fixed cylinder (25) mounted on the outer wall of the ball block (24) and connected to the interior of the ball block (24), a movable cylinder (28) slidably arranged inside the fixed cylinder (25), and a sealing disk (29) fixedly mounted on one end of the movable cylinder (28), the other end of the movable cylinder (28) extending out of the interior of the fixed cylinder (25) and connected to the transmission mechanism.

9. The elbow sand core anti-floating device according to claim 1, characterized in that: Two sealing cylinders (44) are arranged inside the second arc-shaped block (9), a copper strip (43) is arranged inside the sealing cylinder (44), one end of the copper strip (43) extends to the inside of the shell (6) where a second arc-shaped copper sheet (42) is arranged, and the other end of the copper strip (43) extends out of the inside of the second arc-shaped block (9), two hollow blocks (45) are arranged at the bottom of the second arc-shaped block (9), a socket box (47) is arranged at the top of the hollow block (45), and an insert strip (48) is arranged inside the socket box (47) for sliding, and one side of the inside of the square tube (52) is rotated by a torsion spring. A rotating stopper (49) is arranged, and a groove matching the inserting strip (48) is opened at one end of the rotating stopper (49) close to the inserting strip (48). A connecting baffle (51) is fixedly arranged inside the square tube (52), and a movable baffle (50) is hinged at one end of the connecting baffle (51). The movable baffle (50) is located above the rotating stopper (49). One end of the copper strip (43) extends to the inside of the hollow block (45). A second spring (46) is arranged at the inner top of the hollow block (45), and one end of the second spring (46) is connected to one end of the inserting strip (48).

10. A pipe bending casting process, characterized in that: The steps include: Step 1: Separate the lower shell (1) and the upper shell (2), and then place the sand core (8) onto the two first arc-shaped blocks (7) inside the lower shell (1); Step 2: close the lower shell (1) and the upper shell (2) so that the two shells (6) are closed to each other, and then inject iron liquid into the cavity formed by the two shells (6) being butted together through the runner (3); Step 3: After the iron liquid in the cavity is cooled and formed, the lower shell (1) and the upper shell (2) are separated, and the formed bent pipe is taken out.

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