A hot working casting anti-shrinkage device

Abstract

The application discloses a kind of hot working casting casting anti-shrinkage device, belong to hot working casting technical field, by being set heating mechanism and knocking mechanism, by the vibration and disturbance generated by knocking, it is helpful to break the stationary state in 21800 austenitic stainless steel metal liquid in mould, make originally adhere to the small bubble on the inside or wall of liquid be disturbed and start to float up, simultaneously, vibration can also increase the flowability of metal liquid, crank is knocked in the process of metal liquid injection to mould starts, and still continues to keep knocking after metal liquid injection is completed, the power of knocking is derived from the push of steam, other external force intervention is not needed in the process, and with the cooling of metal, the power generated by steam weakens, with the reduction of mould temperature, the frequency of knocking gradually reduces until completely stops, to avoid excessive knocking to damage the stability of metal liquid when condensing purpose.

Description

Technical Field

[0001] This invention relates to the field of hot working casting technology, and in particular to a device for preventing shrinkage cavities in castings used in hot working casting. Background Technology

[0002] During the process of molten metal being poured into the sand casting cavity of a mold, the molten metal will carry air into the casting cavity and form bubbles. Due to the high density of the molten metal, the bubbles in the molten metal are difficult to float to the surface and are difficult to expel. This causes the surface of the casting to shrink during the solidification process, resulting in pores. This phenomenon is called shrinkage cavity. Shrinkage cavity has an irregular shape and rough walls. It is generally located at the hot spot of the casting. After the ingot is rolled into a profile, wrinkles or pores will form in the center of the cross section. Severe porosity, segregation and oxide accumulation often occur in the vicinity, which seriously affects the quality of the casting.

[0003] Existing methods for removing air bubbles include drying the mold to avoid excessive moisture content in the air inside the mold, which would generate water vapor during casting, and using filters to disperse large air bubbles in the molten metal into smaller air bubbles, reducing their difficulty in rising.

[0004] Angle valves made from 21800 austenitic stainless steel are cast with a unique corner shape because the valve body typically has three ports: an inlet, a flow control port, and an outlet. These three ports are distributed at 90 degrees on the valve body.

[0005] Therefore, bubbles generated in the vertical part of the angle valve can be expelled by the mass of the molten metal. However, bubbles generated in the horizontal part have a poorer filling effect, and their upward path is far from the vent hole, making them easily obstructed by the inner wall. Furthermore, the molten metal has poor horizontal fluidity, and the bubbles are easily squeezed by the surrounding liquid, making them difficult to move. Therefore, it is difficult to remove bubbles using the above method. Summary of the Invention

[0006] The purpose of this invention is to solve the problems that, during the casting process of angle valves, bubbles generated in the horizontal part have poor filling effect, their upward path is far from the vent hole and is easily blocked by the inner wall, and the metal liquid has poor horizontal flow, making the bubbles easy to be squeezed by the surrounding liquid and difficult to move. Therefore, a casting anti-shrinkage hole device for hot working casting is proposed.

[0007] To achieve the above objectives, the present invention employs the following technology: a device for preventing shrinkage cavities in castings used in hot-working casting.

[0008] The product includes an angle valve casting, which comprises two L-shaped molds. A heating mechanism is fitted onto the horizontal portion of the molds. The heating mechanism includes a housing for storing liquid and a metal heat exchanger disposed within the housing and in contact with the mold for heat exchange. The metal heat exchanger heats the liquid to generate steam through the heat from the mold.

[0009] The top of the mold is equipped with a striking mechanism, which includes a sealed cavity communicating with the shell and a piston disposed in the sealed cavity. The steam generated in the shell drives the piston to move back and forth in the sealed cavity. A push rod is installed on the piston, penetrating the sealed cavity. A crank is hinged to the end of the push rod. The crank strikes the side wall of the mold as the push rod moves back and forth.

[0010] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0011] The housing includes a split sub-housing and a mother housing. Both the sub-housing and the mother housing are provided with mounting grooves. After the sub-housing and the mother housing are combined, the sealing cavity is fixed by the mounting grooves.

[0012] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0013] The striking mechanism also includes a connector mounted on the mold. The connector includes two grooves on the mold, and a hinge shaft is slidably embedded in the grooves. The crank is hinged to the hinge shaft.

[0014] Two connecting pipes are installed at the bottom of the sealed cavity. One end of the connecting pipe is inserted into the sealed cavity, and the other end is connected to an air exchange mechanism for ventilation.

[0015] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0016] The crank end is fitted with a striking element made of flexible material.

[0017] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0018] The gas exchange mechanism includes an air inlet chamber installed below the sealed cavity and a pressure reduction chamber opened on the air inlet chamber. The bottom of the air inlet chamber has two air holes and the top is connected to two connecting pipes. The connecting pipes include a first air inlet / outlet pipe and a second air inlet / outlet pipe respectively installed at the ends of the sealed cavity and the air inlet chamber.

[0019] The air intake chamber is slidably equipped with a sealing element for blocking the air vents. Steam enters the air intake chamber through the unsealed air vents and enters the sealed chamber through either the first or second air intake / exit pipe to push the piston to move. At the same time, the exhaust gas located on the other side of the piston is pushed by the piston and enters the sealing element through either the first or second air intake / exit pipe. After passing through the sealing element, it reaches the pressure reduction chamber and is discharged.

[0020] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0021] The gas exchange mechanism also includes a connecting rod movably mounted on the air intake chamber and connected to the sealing member, and an exhaust pipe mounted on the pressure reduction chamber. Both the connecting rod and the exhaust pipe pass through and extend to the outside of the housing.

[0022] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0023] A first mounting bracket is installed on the housing, a first hinge is rotatably mounted on the first mounting bracket, an abutment plate and a retractable extension are mounted on the first hinge, and a second hinge connected to a connecting rod is installed at the end of the extension.

[0024] The push rod is equipped with a retractable movable abutment block. When the push rod moves, the movable abutment block abuts against the abutment plate and pushes the second hinge member to deflect around the first hinge member as an axis, pulling the connecting rod to move. The connecting rod drives the closing member to move.

[0025] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0026] The mother shell is equipped with a water replenishment mechanism, which includes a liquid level detection chamber disposed on and connected to the mother shell, and a second mounting bracket installed on the mother shell to reinforce the liquid level detection chamber.

[0027] The liquid level detection chamber is equipped with an inlet valve at the bottom and an exhaust valve at the top. The exhaust valve and the inlet valve are connected by a connecting pipe. When the inlet valve is opened, the liquid flows through the connecting pipe to the exhaust valve and is injected into the liquid level detection chamber to replenish the liquid lost due to heating in the housing.

[0028] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0029] The exhaust valve includes a valve housing installed at the top of the liquid level detection chamber and an exhaust port opened on the valve housing. A ball valve is rotatably installed inside the valve housing, and an L-shaped hole is opened inside the ball valve. An adjustment knob that engages with the valve housing is installed on the top of the ball valve.

[0030] A further description of the anti-shrinkage cavity device for hot-working casting of the above-mentioned technology:

[0031] The liquid level detection chamber is equipped with a liquid level detection mechanism, which includes a lifting chamber installed inside the liquid level detection chamber and a sealing hole opened at the top of the lifting chamber. The surface of the lifting chamber has multiple water inlet holes and a float ball is installed inside. The top of the float ball is equipped with a sealing element that can seal the sealing hole.

[0032] The bottom of the lifting chamber is equipped with a contact that is electrically connected to the water inlet valve. After the contact contacts the float, it controls the water inlet valve to open.

[0033] In summary, due to the adoption of the above-mentioned technology in the anti-shrinkage cavity device for hot-working castings, the beneficial effects of this invention are:

[0034] 1. Through the heating and striking mechanisms, the high temperature generated during the injection of molten metal into the mold heats the water inside the shell and generates steam through the metal heat exchanger. The steam enters the sealed cavity and pushes the piston to move, causing the piston to push the push rod. The crank connected to the end of the push rod deflects under the constraint of the connecting part and strikes the mold. The vibration and disturbance generated by the striking helps to break the static state in the molten metal in the mold, causing small bubbles that were originally attached to the inside of the liquid or the wall to be disturbed and begin to float. At the same time, the vibration can also increase the fluidity of the molten metal. The striking of the crank starts during the injection of molten metal into the mold and continues after the injection is completed. The power of the striking comes from the propulsion of the steam. No other external force is required during the process. As the metal cools, the power generated by the steam weakens. As the temperature of the mold decreases, the striking frequency gradually decreases until it stops completely, thereby avoiding excessive striking that would damage the stability of the molten metal during condensation.

[0035] 2. Through the gas exchange mechanism, the new steam entering the sealed cavity pushes the piston, compressing the space inside the sealed cavity, thereby forcing the exhaust gas on the other side of the piston out of the sealed cavity through the first inlet and outlet pipes. The exhaust gas is collected in the sealing part and reaches the pressure reduction chamber, and then discharged to the outside of the mold through the exhaust pipe connected to the pressure reduction chamber. By repeating the above operation, the steam in the sealed cavity can be circulated and the push rod can be moved back and forth, thereby realizing the action of the crank striking the mold. Attached Figure Description

[0036] Figure 1 A three-dimensional structural schematic diagram of a device for preventing shrinkage cavities in castings used in hot-working casting is shown;

[0037] Figure 2 It shows Figure 1 Enlarged structural diagram at point A;

[0038] Figure 3 A front view cross-sectional schematic diagram of a device for preventing shrinkage cavities in castings used in hot casting is shown.

[0039] Figure 4 A three-dimensional structural diagram of the heating mechanism, the striking mechanism, and the water replenishment mechanism is shown;

[0040] Figure 5 It shows Figure 4 Enlarged structural diagram at point B;

[0041] Figure 6 A side sectional view of the heating mechanism and the striking mechanism is shown.

[0042] Figure 7 A schematic diagram showing the split state of the sub-shell and the mother shell is provided.

[0043] Figure 8 A three-dimensional cross-sectional structural diagram of the striking mechanism and the air exchange mechanism is shown;

[0044] Figure 9 A schematic diagram showing the first steam flow within the striking mechanism and the gas exchange mechanism is shown;

[0045] Figure 10 A schematic diagram showing the second steam flow within the striking mechanism and the gas exchange mechanism is shown;

[0046] Figure 11 A three-dimensional structural diagram of the closure and slide rail is shown;

[0047] Figure 12 A three-dimensional structural schematic diagram of the water replenishment mechanism is shown;

[0048] Figure 13 A frontal cross-sectional view of the shell and water supply mechanism, as well as a schematic diagram of the steam flow, are shown.

[0049] Figure 14 A frontal cross-sectional view of the shell and water replenishment mechanism, as well as a schematic diagram of the water replenishment path, are shown.

[0050] Figure 15 A three-dimensional structural diagram of the ball valve and the adjusting knob is shown.

[0051] Legend:

[0052] 10. Angle valve casting; 11. Sprue; 12. Mold; 13. Gate; 14. Venting channel;

[0053] 20. Heating mechanism; 21. Shell; 211. Sub-shell; 212. Main shell; 22. Metal heat exchanger; 23. Mounting slot;

[0054] 30. Striking mechanism; 31. Sealed cavity; 32. Piston; 33. Connecting pipe; 331. First air inlet / outlet pipe; 332. Second air inlet / outlet pipe; 34. Push rod; 35. Connecting piece; 351. Hinge shaft; 352. Slide groove; 36. Crank; 361. Striking component;

[0055] 40. Air exchange mechanism; 41. Air intake chamber; 42. Sealing component; 421. Slide rail; 43. Pressure reduction chamber; 44. Connecting rod; 45. Exhaust pipe; 46. First mounting bracket; 47. First hinge; 48. Extension component; 49. Second hinge; 410. Abutment plate; 411. Movable abutment block;

[0056] 50. Water replenishment mechanism; 51. Second mounting bracket; 52. Liquid level detection chamber; 53. Water inlet valve; 54. Connecting pipe; 55. Air vent valve; 551. Valve housing; 552. Ball valve; 553. Adjusting knob; 554. Air vent;

[0057] 60. Liquid level detection mechanism; 61. Lifting chamber; 62. Contact point; 63. Float ball; 64. Sealing component; 65. Sealing hole. Detailed Implementation

[0058] The following will describe in detail, with reference to the accompanying drawings of the embodiments of the present invention, a device for preventing shrinkage cavities in hot-working castings according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0059] To address the problems encountered during angle valve casting, such as poor packing of air bubbles in the horizontal section, the bubbles' upward path being obstructed by the inner wall due to their distance from the vent, and the poor horizontal flow of molten metal making the bubbles difficult to move due to compression from the surrounding liquid, this invention proposes a device for preventing shrinkage cavities in hot-working castings. Figure 1 - Figure 15 As shown:

[0060] Including angle valve casting 10, the angle valve casting 10 is made of 21800 austenitic stainless steel, such as Figure 1 As shown, the angle valve casting 10 includes a gating system 11 and two L-shaped molds 12 installed on both sides of the gating system 11. The gating system 11 is equipped with a gate 13 and an exhaust channel 14. The molten metal is injected into the gating system 11 through the gate 13 and then distributed to the two molds 12. The air bubbles generated during the filling of the molds 12 are discharged through the exhaust channel 14.

[0061] To reduce the formation of bubbles in the horizontal section of mold 12, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, a heating mechanism 20 is fitted on the horizontal part of the mold 12. The heating mechanism 20 includes a housing 21 for storing liquid and a metal heat exchanger 22 disposed in the housing 21 and in contact with the mold 12 for heat exchange. The metal heat exchanger 22 heats the liquid to generate steam through the heat of the mold 12.

[0062] The shell 21 includes a split sub-shell 211 and a mother shell 212. Before casting, the shell 21 is attached to the bottom of the horizontal part of the mold 12. Then, the sub-shell 211 and the mother shell 212 are fitted onto the mold 12 and the shell 21 and assembled into the shell 21. After installation, liquid is injected into the shell 21. Preferably, the liquid is water. After checking for leaks, the heating mechanism 20 is installed.

[0063] Meanwhile, both the sub-shell 211 and the mother shell 212 are provided with mounting grooves 23. After the sub-shell 211 and the mother shell 212 are assembled, the striking mechanism 30 is fixed through the mounting grooves 23. Figure 6 As shown, the striking mechanism 30 includes a sealed cavity 31 communicating with the housing 21 and a piston 32 disposed in the sealed cavity 31. The steam generated in the housing 21 drives the piston 32 to reciprocate in the sealed cavity 31. A push rod 34 is installed on the piston 32, penetrating the sealed cavity 31. A crank 36 is hinged to the end of the push rod 34. The crank 36 strikes the side wall of the mold 12 as the push rod 34 reciprocates.

[0064] The striking mechanism 30 also includes a connector 35 mounted on the mold 12. The connector 35 includes two grooves 352 provided on the mold 12. A hinge shaft 351 is slidably embedded in the grooves 352. The crank 36 is hingedly connected to the hinge shaft 351.

[0065] During the process of injecting molten metal into the mold 12, the high temperature generated heats the water in the shell 21 through the metal heat exchanger 22 and generates steam. The steam enters the sealed cavity 31 and pushes the piston 32 to move, causing the piston 32 to push the push rod 34. The crank 36 connected to the end of the push rod 34 deflects under the restriction of the connecting piece 35 and strikes the mold 12. The vibration and disturbance generated by the striking helps to break the static state in the molten metal in the mold 12, causing the small bubbles that were originally attached to the inside of the liquid or the wall to be disturbed and begin to float. At the same time, the vibration can also increase the fluidity of the molten metal. The striking of the crank 36 begins during the process of injecting molten metal into the mold 12 and continues after the molten metal is injected. The power of the striking comes from the push of the steam. No other external force is required during the process. As the metal cools, the power generated by the steam weakens. As the temperature of the mold 12 decreases, the frequency of striking gradually decreases until it stops completely, thereby avoiding excessive striking that could damage the stability of the molten metal during condensation.

[0066] It should be noted that the crank 36 deflects in an arc shape while the push rod 34 moves horizontally. Therefore, when the crank 36 and the push rod 34 are perpendicularly distributed, the push rod 34 will push the hinge shaft 351 to slide a certain distance under the restriction of the slide groove 352 through the crank 36, and when they are not perpendicularly distributed, it will pull the hinge shaft 351 to slide back and reset.

[0067] To prevent the surface of the mold 12 from being damaged by the crank 36 striking the mold 12, a striking element 361 made of flexible material is installed at the end of the crank 36. The flexible material is one of polyvinyl alcohol (PVA), polyester (PET), and polyimide (PI).

[0068] Furthermore, in order to allow the exhaust gas that has lost kinetic energy due to pushing the piston 32 in the sealed cavity 31 to be discharged from the sealed cavity 31 without affecting the normal movement of the piston 32, such as... Figures 8-10 As shown, two connecting pipes 33 are installed at the bottom of the sealing cavity 31. One end of the connecting pipe 33 is inserted into the sealing cavity 31, and the other end is connected to an air exchange mechanism 40 for ventilation.

[0069] like Figure 8 As shown, the air exchange mechanism 40 includes an air inlet chamber 41 installed below the sealing chamber 31 and a pressure reducing chamber 43 opened on the air inlet chamber 41. The bottom of the air inlet chamber 41 has two air holes and the top is connected to two connecting pipes 33. The connecting pipes 33 include a first air inlet / outlet pipe 331 and a second air inlet / outlet pipe 332 respectively installed at the ends of the sealing chamber 31 and the air inlet chamber 41.

[0070] The intake chamber 41 is slidably equipped with a sealing member 42 for sealing the air hole. Steam enters the intake chamber 41 through the unsealed air hole and enters the sealing chamber 31 through either the first intake / exhaust pipe 331 or the second intake / exhaust pipe 332 to push the piston 32 to move. At the same time, the exhaust gas on the other side of the piston 32 is pushed by the piston 32 and enters the sealing member 42 through either the first intake / exhaust pipe 331 or the second intake / exhaust pipe 332. After passing through the sealing member 42, it reaches the pressure reducing chamber 43 and is discharged.

[0071] To improve the stability of the movement of the closure 42, such as Figure 11 As shown, slide rails 421 are provided on both sides of the inner wall of the air intake chamber 41, and the sealing member 42 is slidably embedded on both sides of the slide rails 421, thereby preventing the sealing member 42 from shifting during the sliding process.

[0072] The air exchange mechanism 40 also includes a connecting rod 44 movably mounted on the air intake chamber 41 and connected to the sealing member 42, and an exhaust pipe 45 mounted on the pressure reduction chamber 43. Both the connecting rod 44 and the exhaust pipe 45 pass through and extend to the outside of the housing 21.

[0073] In specific operation, the water in the housing 21 is heated into steam and enters through the air hole at the bottom of the air inlet chamber 41 near the first air inlet and outlet pipe 331, and is injected into the piston 32 through the first air inlet and outlet pipe 331. Driven by the steam, the piston 32 moves inside the sealed chamber 31 and pulls the push rod 34, so that the push rod 34 drives the crank 36 to strike the mold 12.

[0074] Meanwhile, a first mounting bracket 46 is installed on the housing 21, a first hinge 47 is rotatably mounted on the first mounting bracket 46, an abutment plate 410 and a telescopic extension 48 are installed on the first hinge 47, and a second hinge 49 connected to the connecting rod 44 is installed at the end of the extension 48.

[0075] A retractable movable abutment block 411 is installed on the push rod 34. When the push rod 34 moves, the movable abutment block 411 abuts against the abutment plate 410, and pushes the second hinge member 49 to deflect around the first hinge member 47 as an axis, pulling the connecting rod 44 to move. The connecting rod 44 drives the closing member 42 to move. During the movement, the push rod 34 pushes the abutment plate 410 by pushing the movable abutment block 411. When the movable abutment block 411 pushes the abutment plate 410 to the other side to the maximum angle, it can retract under the push of the abutment plate 410 to achieve the purpose of disengaging from the abutment plate 410. This causes the abutment plate 410 to drive the first hinge member 47 to deflect under the restriction of the first mounting bracket 46. The connector 47 pulls the second hinge 49 through the extension 48. During the pulling process, the second hinge 49 moves on the surface of the extension 48 to compensate for the change in the distance between the first hinge 47 and the second hinge 49, so that the second hinge 49 pulls the connecting rod 44. The connecting rod 44 drives the sealing member 42 to slide inside the air inlet chamber 41 and block the air hole near the first air inlet / outlet pipe 331. At the same time, it opens the air hole near the second air inlet / outlet pipe 332. Steam enters the air inlet chamber 41 through the air hole and is introduced into the sealing chamber 31 through the second air inlet / outlet pipe 332, pushing the piston 32 to move in the opposite direction in the sealing chamber 31. The push rod 34 drives the crank 36 to rise away from the mold 12 under the pull of the piston 32.

[0076] Meanwhile, the new steam entering the sealed cavity 31 pushes the piston 32, compressing the space inside the sealed cavity 31, thereby forcing the exhaust gas on the other side of the piston 32 out of the sealed cavity 31 through the first inlet / outlet pipe 331. The exhaust gas is collected in the sealing member 42 and reaches the pressure reducing chamber 43, and then discharged to the outside of the mold 12 through the exhaust pipe 45 connected to the pressure reducing chamber 43. By repeating the above operation, the steam in the sealed cavity 31 can be circulated and the push rod 34 can be moved back and forth, thereby realizing the action of the crank 36 striking the mold 12.

[0077] To prevent insufficient water inside the casing 21, which could lead to damage to the casing 21 at high temperatures, such as... Figure 12As shown, a water replenishment mechanism 50 is installed on the mother shell 212. The water replenishment mechanism 50 includes a liquid level detection chamber 52 disposed on and communicating with the mother shell 212, and a second mounting bracket 51 installed on the mother shell 212 to reinforce the liquid level detection chamber 52.

[0078] The liquid level detection chamber 52 is equipped with an inlet valve 53 at the bottom and an exhaust valve 55 at the top. The exhaust valve 55 and the inlet valve 53 are connected by a connecting pipe 54. When the inlet valve 53 is opened, the liquid flows through the connecting pipe 54 to the exhaust valve 55 and is injected into the liquid level detection chamber 52 to replenish the liquid lost due to heating in the housing 21.

[0079] Furthermore, such as Figures 13-15 As shown, the exhaust valve 55 includes a valve housing 551 installed on the top of the liquid level detection chamber 52 and an exhaust hole 554 opened on the valve housing 551. A ball valve 552 is rotatably arranged inside the valve housing 551. An L-shaped hole is opened inside the ball valve 552. An adjustment knob 553 that meshes with the valve housing 551 is installed on the top of the ball valve 552.

[0080] When it is necessary to release excess steam in the mold 12, the ball valve 552 is rotated in the valve housing 551 by turning the adjusting knob 553. The two ends of the L-shaped hole of the ball valve 552 are aligned with the water inlet valve 53 and the exhaust hole 554 respectively. The steam in the housing 21 enters through the valve housing 551, passes through the ball valve 552, reaches the exhaust hole 554 and is discharged.

[0081] When water needs to be added, turn the adjusting knob 553 to align the two ends of the L-shaped hole of the ball valve 552 with the connecting pipe 54 and the liquid level detection chamber 52 respectively. After the excess steam in the housing 21 is discharged, open the water inlet valve 53. The water flows through the connecting pipe 54 into the valve housing 551, flows through the ball valve 552 into the housing 21, and the water replenishment operation is completed.

[0082] When normal use is required, simply align the horizontal end of the L-shaped hole with the inner wall of the valve body 551 to seal it, so that neither steam nor water can pass through the ball valve 552.

[0083] In order to achieve automatic water replenishment, such as Figure 12 and Figure 13 As shown, a liquid level detection mechanism 60 is provided inside the liquid level detection chamber 52. The liquid level detection mechanism 60 includes a lifting chamber 61 installed inside the liquid level detection chamber 52 and a sealing hole 65 opened on the top of the lifting chamber 61. The surface of the lifting chamber 61 has multiple water inlet holes and a float ball 63 is provided inside. A sealing member 64 that can seal the sealing hole 65 is provided on the top of the float ball 63.

[0084] The bottom of the lifting chamber 61 is equipped with a contact 62 that is electrically connected to the water inlet valve 53. When the water level in the mold 12 is too low, the float 63 drives the sealing part 64 to be pulled out from the closed hole 65 and gradually decreases with the water level in the mold 12 until it contacts the contact 62. After the contact 62 contacts the float 63, it controls the water inlet valve 53 to open, so that water can be injected into the housing 21 through the water inlet valve 53 and the connecting pipe 54, the air vent valve 55 and the closed hole 65. As the water level in the housing 21 rises, the float 63 floats up and drives the sealing part 64 to insert into the closed hole 65 to stop the water from continuing to be injected. As the water flow stops, the water inlet valve 53 automatically closes, and the automatic water replenishment is completed.

[0085] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's technology and the inventive concept of a hot-working casting anti-shrinkage hole device, should be covered within the scope of protection of the present invention.

Claims

1. A hot work foundry anti-feeding device for a casting, comprising a corner valve casting (10) including two L-shaped castings (12), characterized in that, The horizontal part of the mold (12) is sleeved with a heating mechanism (20), which comprises a shell (21) storing liquid and a metal heat exchange element (22) arranged in the shell (21) and in contact with the mold (12) for heat exchange, the metal heat exchange element (22) is heated by the heat of the mold (12) to heat the liquid to generate steam; The top of the mold (12) is provided with a knocking mechanism (30), which comprises a sealed cavity (31) in communication with the shell (21), a piston (32) arranged in the sealed cavity (31), the steam generated in the shell (21) drives the piston (32) to reciprocate in the sealed cavity (31), a push rod (34) penetrating the sealed cavity (31) is arranged on the piston (32), a crank (36) is hingedly connected to the end of the push rod (34), and the crank (36) knocks the side wall of the mold (12) with the reciprocating movement of the push rod (34); And two communication pipes (33) are arranged at the bottom of the sealed cavity (31), one end of the communication pipe (33) is inserted into the sealed cavity (31), and the other end is connected with an air exchange mechanism (40) for air exchange; The air exchange mechanism (40) comprises an air inlet cavity (41) arranged below the sealed cavity (31) and a pressure reduction cavity (43) opened in the air inlet cavity (41), two air holes are arranged at the bottom of the air inlet cavity (41), and the top of the air inlet cavity (41) is connected with two communication pipes (33); the communication pipe (33) comprises a first air inlet and outlet pipe (331) and a second air inlet and outlet pipe (332) arranged at the two side ends of the sealed cavity (31) and the air inlet cavity (41) respectively; The inside of the air inlet cavity (41) is slidably provided with a closure (42) for blocking the air hole, the steam enters the air inlet cavity (41) through the unblocked air hole, enters the sealed cavity (31) through any one of the first air inlet and outlet pipe (331) or the second air inlet and outlet pipe (332) to drive the piston (32) to move, and the exhaust gas on the other side of the piston (32) enters the closure (42) through any one of the first air inlet and outlet pipe (331) or the second air inlet and outlet pipe (332) under the driving of the piston (32), and then reaches the pressure reduction cavity (43) through the closure (42) and is discharged.

2. A hot metal casting anti-shrinkage device for casting according to claim 1, characterized in that, The shell (21) comprises a split sub-shell (211) and a female shell (212), the sub-shell (211) and the female shell (212) are both provided with a mounting groove (23), and the sub-shell (211) and the female shell (212) are combined and fixed by the mounting groove (23).

3. A hot metal casting anti-shrinkage device for casting according to claim 1, characterized in that, The knocking mechanism (30) further comprises a connecting piece (35) arranged on the mold (12), the connecting piece (35) comprises two sliding grooves (352) arranged on the mold (12), a hinged shaft (351) is slidably embedded in the sliding groove (352), and the crank (36) is hingedly connected with the hinged shaft (351).

4. A hot working casting anti-shrinkage device according to claim 1 or 3, characterized in that, The end of the crank (36) is provided with a knocking piece (361) made of flexible material.

5. A hot metal casting anti-shrinkage device for casting according to claim 1, wherein The air exchange mechanism (40) further comprises a connecting rod (44) movably mounted on the air inlet cavity (41) and connected with the closure (42), and an exhaust pipe (45) mounted on the pressure reduction cavity (43), both the connecting rod (44) and the exhaust pipe (45) penetrating and extending out of the shell (21).

6. A hot metal casting anti-shrinkage device for casting according to claim 5, wherein A first mounting bracket (46) is mounted on the shell (21), a first hinge (47) is rotatably mounted on the first mounting bracket (46), an abutting plate (410) and an extendable extension (48) are mounted on the first hinge (47), and a second hinge (49) connected with the connecting rod (44) is mounted at the end of the extension (48). An extendable movable abutting block (411) is mounted on the push rod (34), and the movable abutting block (411) abuts against the abutting plate (410) when the push rod (34) moves, thereby pushing the second hinge (49) to pivot about the first hinge (47) and pull the connecting rod (44) to move, and the connecting rod (44) drives the closure (42) to move.

7. A hot metal casting anti-shrinkage device for casting according to claim 2, wherein A water supplement mechanism (50) is mounted on the female shell (212), and the water supplement mechanism (50) comprises a liquid level detection cavity (52) arranged on the female shell (212) and communicating with the female shell (212), and a second mounting bracket (51) mounted on the female shell (212) to reinforce the liquid level detection cavity (52). A water inlet valve (53) is mounted at the bottom of the liquid level detection cavity (52), and an exhaust valve (55) is mounted at the top of the liquid level detection cavity (52), the exhaust valve (55) and the water inlet valve (53) are communicated through a communication pipe (54), and when the water inlet valve (53) is opened, liquid reaches the exhaust valve (55) through the communication pipe (54) to be injected into the liquid level detection cavity (52), thereby supplementing the liquid lost due to heating in the shell (21).

8. A hot metal casting anti-shrinkage device for casting according to claim 7, wherein The exhaust valve (55) comprises a valve shell (551) mounted at the top of the liquid level detection cavity (52) and an exhaust hole (554) formed in the valve shell (551), a spherical valve (552) rotatably arranged in the valve shell (551), an L-shaped hole formed in the spherical valve (552), and an adjusting knob (553) mounted at the top of the spherical valve (552) and engaged with the valve shell (551).

9. A hot metal casting anti-shrinkage device for casting according to claim 8, wherein A liquid level detection mechanism (60) is arranged in the liquid level detection cavity (52), and the liquid level detection mechanism (60) comprises a lifting cavity (61) mounted in the liquid level detection cavity (52) and a closed hole (65) formed at the top of the lifting cavity (61), a plurality of water inlet holes are formed on the surface of the lifting cavity (61), and a floating ball (63) is arranged in the lifting cavity (61), a blocking member (64) is arranged at the top of the floating ball (63) to block the closed hole (65), and a contact (62) electrically connected with the water inlet valve (53) is mounted at the bottom of the lifting cavity (61), the contact (62) controls the water inlet valve (53) to open after being in contact with the floating ball (63).

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