A low pressure casting machine

Abstract

The present invention belongs to the field of casting technology, specifically a low-pressure casting machine, comprising a machine base; a plurality of hydraulic cylinders are fixedly connected to the top of the machine base; a fixing frame is fixedly connected to the output ends of the plurality of hydraulic cylinders; a sleeve is fixedly connected to the central inner wall of the fixing frame, and the bottom end of the sleeve is inclined; the inner and outer walls of the riser are scraped respectively by the cooperation of the annular scraper and the sleeve, so as to reduce the adhesion of molten metal to the inner and outer walls of the riser, reduce the erosion and damage of the riser, and improve the molding effect of the casting; a crucible is filled with molten metal and placed on the machine base, and the crucible is sealed by a square plate pressing a sealing plate; compressed air is injected into the crucible by a compressor, so that the molten metal inside the crucible is sent to the molding mold by the riser, so as to achieve the effect of low-pressure casting of the casting; a sliding plate slides on the inner wall of the square plate as a partition, so as to improve the efficiency of injecting compressed air into the crucible.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, in particular to a low-pressure casting machine. Background Art

[0002] Low-pressure casting is a casting method in which a mold is placed on a sealed crucible and compressed air is introduced into the sealed crucible to create a low pressure on the surface of the liquid metal. The liquid metal then rises through a riser pipe to fill the mold and control solidification.

[0003] A patent application with publication number CN108262462A discloses a low-pressure casting machine, including a workbench, a heat preservation furnace is provided inside the workbench, a liquid riser is provided inside the heat preservation furnace, and a calibration block is provided on the top of the heat preservation furnace. The screw rod provided in the present application drives the sleeve to move upward, and simultaneously drives the pressure plate, the upper mold, the top mold plate and the finished product to move upward. The roller is movably engaged with the slide rail, and the lug slides in the guide rail, so that the demolding is stable and the damage to the finished product is reduced.

[0004] The above-mentioned low-pressure casting machine can stabilize the demolding of the molded casting and reduce the damage caused by the molding of the casting through the multiple components set up. However, since the current low-pressure casting machine often uses a riser pipe to send molten metal to fill the mold during casting, some of the molten metal adheres to the inner wall of the riser pipe for a long time, which can easily cause the riser pipe to be corroded and scrapped, and even affect the molding effect of the casting.

[0005] To this end, the present invention provides a low-pressure casting machine. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a low-pressure casting machine described in the present invention includes a machine base; a plurality of hydraulic cylinders are fixedly connected to the top of the machine base; the output ends of the plurality of hydraulic cylinders are fixedly connected to a fixed frame; a sleeve is fixedly connected to the central inner wall of the fixed frame, and the bottom end of the sleeve is inclined; a connecting rod is fixedly connected to the inner wall of the sleeve; an annular scraper is fixedly connected to the bottom end of the connecting rod; a casting mechanism is provided at the end of the machine base and below the fixed frame, and the casting mechanism is used for low-pressure casting of the casting; a liquid riser is provided on the casting mechanism, and the liquid riser is provided below the annular scraper; a gas injection assembly is provided at the bottom end of the fixed frame, and the gas injection assembly is used for injecting gas for casting.

[0008] Preferably, the casting mechanism includes a crucible, a connecting frame and a sealing assembly; the crucible is arranged at the end of the machine base; the connecting frame is fixedly connected to the top inner wall of the crucible, and the riser is fixedly connected to the center of the connecting frame; the sealing assembly is arranged at the bottom end of the fixed frame, and the sealing assembly is used to seal the crucible.

[0009] Preferably, the sealing assembly includes a square plate and a sealing groove; the square plate is fixed to the bottom end of the fixing frame; the sealing groove is fixed to the outside of the crucible; a sealing plate is arranged between the crucible and the sealing groove, and the square plate and the sealing plate are arranged correspondingly.

[0010] Preferably, the gas injection assembly includes a compressor, an air guide plate and an air outlet; the compressor is fixed to the bottom end of the fixed frame and is located inside the square plate; the air guide plate is fixed to the output end of the compressor; multiple air outlets are fixed to the bottom end of the air guide plate; multiple air outlets are provided with air holes inside, and multiple air outlets can be connected to the output end of the compressor through the air guide plate.

[0011] Preferably, the inner wall of the square plate is slidably connected to a sliding plate; a plurality of matching holes are opened on the sliding plate, and the plurality of matching holes are arranged corresponding to the plurality of gas outlets; a plurality of push rods are fixedly connected to the top of the crucible, and the plurality of push rods are located below the sliding plate.

[0012] Preferably, a water storage chamber is provided inside the crucible; a water pump is fixedly connected inside the crucible and located at the water storage chamber; a plurality of guide grooves are provided inside the crucible and located above the water storage chamber; a plurality of flow grooves are provided outside the crucible and located at the sealing plate, and the plurality of flow grooves can be connected to the output end of the water pump through the plurality of guide grooves.

[0013] Preferably, a plurality of flow tubes are fixedly connected to the inner wall of the crucible near the guide groove; a plurality of DC nozzles are fixedly connected to the bottom end of the connecting frame and in contact with the inner wall of the crucible, and the DC nozzles can be connected to the guide groove through the flow tubes; a diversion component is arranged inside the crucible, and the diversion component is used to divert water extracted by the water pump.

[0014] Preferably, the diversion assembly includes a limit block, a sealing block and an elastic pull rope; the limit block is fixedly connected to the inside of the crucible, and the limit block is located at the flow slot; the sealing block is slidably connected to the inner wall of the crucible, and the sealing block is located above the limit block; the elastic pull rope is fixedly connected to the outside of the limit block, and one end of the elastic pull rope away from the limit block is fixedly connected to the bottom end of the sealing block.

[0015] Preferably, an extrusion block is slidably connected to the inner wall of the crucible near the circulation tube; and an elastic member is fixedly connected between the extrusion block and the inner wall of the crucible.

[0016] Preferably, a No. 1 limit plate is fixedly connected to the end of the machine base, and one side opening of the No. 1 limit plate is set as an inclined surface; four No. 2 limit plates are fixedly connected to the inside of the fixed frame, the four are square in shape, and the cross-sectional shape of the four No. 2 limit plates is L-shaped.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The low-pressure casting machine described in the present invention scrapes the inner and outer walls of the riser tube respectively through the cooperation of the annular scraper and the sleeve, thereby reducing the adhesion of molten metal on the inner and outer walls of the riser tube, reducing the erosion and damage of the riser tube, and improving the molding effect of the casting. The crucible is filled with molten metal and placed on the machine base. The crucible is sealed by pressing the sealing plate with a square plate. Compressed air is injected into the crucible by a compressor, so that the molten metal inside the crucible is sent to the molding mold by the riser tube, thereby achieving the effect of low-pressure casting of the casting. The sliding plate slides on the inner wall of the square plate as a partition to improve the efficiency of injecting compressed air into the crucible.

[0019] 2. The low-pressure casting machine described in the present invention draws water from the water storage chamber through a water pump, and sends it from the guide groove to the sealing plate for temporary storage, and cooperates with the square plate to press the sealing groove to improve the sealing tightness of the square plate on the crucible, and uses the DC nozzle to draw water and spray the inner wall of the crucible to rinse and clean the inner wall of the crucible. The sealing block is pulled by the elastic rope on the limit block to control the discharge of water in the guide groove, and the extrusion block is slid to the upper position of the sealing block to increase the resistance and reduce the situation where water is mistakenly sent to the DC nozzle for spraying. The crucible is limited by the No. 1 limit plate to facilitate the placement of the crucible on the machine base, and the No. 2 limit plate is used to limit the forming mold to improve the effect of casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a stereogram of the present invention;

[0022] Figure 2 It is a partial structural cross-sectional view of the blocking plate in the present invention;

[0023] Figure 3 It is a structural schematic diagram of the connecting frame in the present invention;

[0024] Figure 4 is a partial structural cross-sectional view of the crucible of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a punching bag in the present invention.

[0026] In the figure: 1. machine base; 11. hydraulic cylinder; 12. fixing frame; 13. sleeve; 14. connecting rod; 15. annular scraper; 2. crucible; 21. connecting frame; 22. rising pipe; 3. square plate; 31. blocking groove; 32. blocking plate; 4. compressor; 41. air guide plate; 42. air outlet; 43. air hole; 5. sliding plate; 51. matching hole; 52. push rod; 6. water storage chamber; 61. water pump; 62. guide groove; 63. circulation groove; 7. circulation pipe; 71. DC nozzle; 8. limit block; 81. blocking block; 82. elastic pull rope; 9. extrusion block; 91. elastic part; 92. limit plate No. 1; 93. limit plate No. 2. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figures 1 to 5 As shown, a low-pressure casting machine described in an embodiment of the present invention comprises a machine base 1; a plurality of hydraulic cylinders 11 are fixedly connected to the top of the machine base 1; a fixing frame 12 is fixedly connected to the output ends of the plurality of hydraulic cylinders 11; a sleeve 13 is fixedly connected to the central inner wall of the fixing frame 12, and the bottom end of the sleeve 13 is inclined; a connecting rod 14 is fixedly connected to the inner wall of the sleeve 13; an annular scraper 15 is fixedly connected to the bottom end of the connecting rod 14; a casting mechanism is arranged at the end of the machine base 1 and below the fixing frame 12, and the casting mechanism is used for low-pressure casting of the casting; a liquid riser 22 is arranged on the casting mechanism, and the liquid riser 22 is arranged below the annular scraper 15; a gas injection assembly is arranged at the bottom end of the fixing frame 12, and the gas injection assembly is used for injecting gas for casting; when using the low-pressure casting machine to low-pressure cast the casting, firstly, the molding mold is placed in the top groove of the fixing frame 12, The casting mechanism is placed at the end position of the machine base 1, and the four hydraulic cylinders 11 serve as supporting components of the fixed frame 12. The molten metal is added to the casting mechanism, and then the output ends of the four hydraulic cylinders 11 drive the fixed frame 12 to slide down. The connecting rod 14 cooperates with the annular scraper 15 to scrape the inner wall of the riser pipe 22 to remove the residual molten metal attached to the last time, and cooperates with the inclined surface at the bottom end of the sleeve 13 to scrape the outer wall of the riser pipe 22 to reduce the adhesion of the molten metal on the riser pipe 22. After the casting is sealed, compressed air is injected into the casting by using the air injection assembly, so that the molten metal is sent from the riser pipe 22 to the molding mold. After the filling and solidification of the inside of the casting mold, the output ends of the four hydraulic cylinders 11 drive the fixed frame 12 to reset, and the annular scraper 15 scrapes the inner wall of the riser pipe 22 again to reduce the residual molten metal on the inner wall of the riser pipe 22, reduce the probability of the riser pipe 22 being scrapped due to erosion, and improve the molding effect of the casting.

[0029] like Figures 1 to 4As shown, the casting mechanism includes a crucible 2, a connecting frame 21 and a sealing assembly; the crucible 2 is arranged at the end of the machine base 1; the connecting frame 21 is fixedly connected to the inner wall of the top end of the crucible 2, and the rising pipe 22 is fixedly connected to the center of the connecting frame 21; the sealing assembly is arranged at the bottom end of the fixing frame 12, and the sealing assembly is used to seal the crucible 2; when the casting is low-pressure casted, the molten metal is added to the inside of the crucible 2, and the crucible 2 is placed at the end of the machine base 1, and the rising pipe 22 is fixed at the center of the connecting frame 21, so that the annular scraper 15 can be inserted into the inner wall of the rising pipe 22 to scrape, and after the crucible 2 is sealed by the sealing assembly, compressed air is injected into the casting, and the molten metal inside the crucible 2 is sent to the molding mold by the rising pipe 22 for casting, which plays a role in low-pressure casting of the casting.

[0030] The sealing assembly includes a square plate 3 and a sealing groove 31; the square plate 3 is fixedly connected to the bottom end of the fixing frame 12; the sealing groove 31 is fixedly connected to the outside of the crucible 2; a sealing plate 32 is arranged between the crucible 2 and the sealing groove 31, and the square plate 3 and the sealing plate 32 are arranged correspondingly; when the crucible 2 is sealed for low-pressure casting, the fixing frame 12 is used to drive the square plate 3 to slide down, the annular scraper 15 cooperates with the sleeve 13 to scrape the inner and outer walls of the rising tube 22, the square plate 3 is pressed on the inner wall of the sealing groove 31, and is located at the sealing plate 32 between the crucible 2 and the sealing groove 31, the square plate 3 can seal the periphery of the crucible 2, thereby facilitating the low-pressure casting of the crucible 2 by injecting compressed air, and at the same time, the sealing groove 31 can not only be used as a sealing fitting of the square plate 3, but also can be used as a handle, and the bottom end of the sealing groove 31 can be grasped for easy movement when carrying the crucible 2.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, the gas injection assembly includes a compressor 4, an air guide plate 41 and an air outlet 42; the compressor 4 is fixedly connected to the bottom end of the fixed frame 12 and is located inside the square plate 3; the air guide plate 41 is fixedly connected to the output end of the compressor 4; a plurality of the air outlets 42 are fixedly connected to the bottom end of the air guide plate 41; a plurality of the air outlets 42 are provided with air holes 43 inside, and a plurality of the air outlets 42 can be connected to the output end of the compressor 4 through the air guide plate 41; when the crucible 2 is injected with gas for low-pressure casting, the compressor 4 is fixed to the bottom end of the fixed frame 12, and after the square plate 3 cooperates with the sealing groove 31 to seal the crucible 2, the compressed gas is discharged from the output end of the compressor 4, and the gas enters the inside of the air guide plate 41, and the gas is sent downward by the plurality of air outlets 42, and is discharged from the air holes 43 opened by the air outlets 42. The compressor 4 is arranged inside the square plate 3, which replaces the traditional external gas injection method, which not only improves the injection speed, but also reduces the leakage of compressed air, thereby improving the molding effect of the casting.

[0032] like Figures 1 to 5 As shown, the inner wall of the square plate 3 is slidably connected with a sliding plate 5; a plurality of matching holes 51 are opened on the sliding plate 5, and the plurality of matching holes 51 are correspondingly arranged with a plurality of gas outlets 42; a plurality of push rods 52 are fixedly connected to the top of the crucible 2, and the plurality of push rods 52 are located below the sliding plate 5; when compressed air is injected into the crucible 2, since the internal cavity of the square plate 3 is large, more compressed air needs to be injected, and the sliding plate 5 is slidably installed in the middle part of the square plate 3 as a partition to reduce the amount of gas required at the crucible 2. When the square plate 3 slides down to block the crucible 2, the plurality of push rods 52 can lift the sliding plate 5 and slide up, so that the gas outlet 42 passes through the matching holes 51, and the air holes 43 are exposed below the sliding plate 5. The compressor 4 works to generate compressed gas and delivers it to the crucible 2, thereby increasing the injection speed of the compressed gas, thereby increasing the molding speed of the casting. At the same time, the sliding plate 5 can shield and protect the compressor 4 to reduce the situation where the molten metal adheres to the compressor 4.

[0033] like Figures 1 to 4 As shown, a water storage chamber 6 is provided inside the crucible 2; a water pump 61 is fixedly connected inside the crucible 2 and located at the water storage chamber 6; a plurality of guide grooves 62 are provided inside the crucible 2 and located above the water storage chamber 6; a plurality of flow grooves 63 are provided outside the crucible 2 and located at the sealing plate 32, and the plurality of flow grooves 63 can be connected to the output end of the water pump 61 through the plurality of guide grooves 62; when the crucible 2 is sealed for low-pressure casting, one of the most important things in low-pressure casting is sealing. It is easy to leak air if the square plate 3 and the sealing groove 31 are used for sealing. Water is added into the water storage chamber 6, and the water pump 61 draws the water in the water storage chamber 6 and sends it to the guide groove 62. The water flows along the flow groove 63 to the sealing plate 32 for temporary storage, and the square plate 3 is pressed on the sealing plate 32 for sealing, and the fitting part of the square plate 3 and the sealing groove 31 is surrounded by water, thereby improving the sealing effect of the crucible 2.

[0034] A plurality of flow tubes 7 are fixedly connected to the inner wall of the crucible 2 near the guide groove 62; a plurality of DC nozzles 71 are fixedly connected to the bottom end of the connecting frame 21 and are in contact with the inner wall of the crucible 2, and the DC nozzles 71 can be connected to the guide groove 62 through the flow tubes 7; a flow splitter assembly is arranged inside the crucible 2, and the flow splitter assembly is used to split the water extracted by the water pump 61; when the casting is completed and the molten metal in the crucible 2 is used up, part of the molten metal adheres to the inner wall of the crucible 2 and is easy to cause erosion, and the water pump 61 is used to separate the water from the inner wall of the crucible 2. The output power is set to two gears. When the power is at the first gear, the water pumped to the guide groove 62 can be blocked by the diversion component, and the water flows from the flow groove 63 to the blocking plate 32 for temporary storage. When the power is at the second gear, the water pumped to the guide groove 62 can flush the diversion component to the top, so that the water reaches the DC nozzle 71 through the flow pipe 7 to spray the inner wall of the square crucible 2. Note that multiple flow grooves 63 need to be blocked to flush the molten metal attached to the inner wall of the crucible 2.

[0035] The flow diversion assembly includes a limit block 8, a blocking block 81 and an elastic pull rope 82; the limit block 8 is fixedly connected to the inside of the crucible 2, and the limit block 8 is located at the flow slot 63; the blocking block 81 is slidably connected to the inner wall of the crucible 2, and the blocking block 81 is located above the limit block 8; the elastic pull rope 82 is fixedly connected to the outside of the limit block 8, and one end of the elastic pull rope 82 away from the limit block 8 is fixedly connected to the bottom end of the blocking block 81; when the inner wall of the crucible 2 is flushed, the output power of the water pump 61 is set to the second gear, and the water pump 61 is used to adjust the output power of the water pump 61 to the second gear. The pump 61 draws water to flush the blocking block 81 and slide it up to the top. The elastic pull rope 82 on the limit block 8 pulls the blocking block 81 to stretch it. Water is passed through the flow pipe 7 and sprayed at the DC nozzle 71 to rinse and clean the inner wall of the crucible 2. When the output power of the water pump 61 is set to the first gear, the pumped water can flush the limit block 8 and slide up to just cross the flow slot 63. The elastic pull rope 82 pulls the blocking block 81 to open the flow slot 63, and the flow pipe 7 is blocked, which plays a role in diverting the extracted water.

[0036] An extrusion block 9 is slidably connected to the inner wall of the crucible 2 near the circulation pipe 7; an elastic member 91 is fixedly connected between the extrusion block 9 and the inner wall of the crucible 2; when the water pumped from the guide groove 62 is diverted, the extrusion block 9 is slid on the guide groove 62 to increase the sliding resistance of the blocking block 81, and reduce the situation where the force generated by the pumping at the guide groove 62 is too large and is sprayed from the DC nozzle 71, thereby causing water to enter the molten metal and affect the molding of the casting. When it is necessary to rinse the inner wall of the crucible 2, the second-gear water pump 61 pumps water to flush the blocking block 81 to squeeze the extrusion block 9, so that the extrusion block 9 squeezes the elastic member 91 to contract, and finally water is sprayed from the DC nozzle 71 to rinse the inner wall of the crucible 2 and clean it.

[0037] like Figures 1 to 3As shown, a No. 1 limit plate 92 is fixedly connected to the end of the machine base 1, and one side opening of the No. 1 limit plate 92 is set as an inclined surface; four No. 2 limit plates 93 are fixedly connected to the inside of the fixed frame 12, and the four are set in a square shape, and the cross-sectional shape of the four No. 2 limit plates 93 is L-shaped; when the crucible 2 filled with molten metal is placed on the machine base 1, the No. 1 limit plate 92 is fixed to the end of the machine base 1 to limit the crucible 2, and the crucible 2 is pushed into the opening of the No. 1 limit plate 92, and the crucible 2 is guided and placed by relying on the inclined surface of the No. 1 limit plate 92, so that the liquid riser 22 on the crucible 2 can be placed corresponding to the annular scraper 15, and the four L-shaped No. 2 limit plates 93 on the fixed frame 12 are respectively located at the four corners of the top of the fixed frame 12, and are set in a square shape, which is used to limit the placement of the molding mold.

[0038] Working process: When using a low-pressure casting machine to low-pressure cast a casting, first place the molding die in the top groove of the fixed frame 12, and place the casting mechanism at the end position of the machine base 1. The four hydraulic cylinders 11 serve as the supporting parts of the fixed frame 12. The molten metal is added to the casting mechanism. Then, the output ends of the four hydraulic cylinders 11 drive the fixed frame 12 to slide down. The connecting rod 14 cooperates with the annular scraper 15 to scrape the inner wall of the riser pipe 22 to scrape off the residual molten metal attached to the last time. The outer wall of the riser pipe 22 is scraped with the inclined surface at the bottom of the sleeve 13 to reduce the adhesion of the molten metal on the riser pipe 22. After the casting is sealed, the gas injection assembly is used to cast the casting. Compressed air is injected at the bottom of the casting to deliver the molten metal from the riser pipe 22 to the molding die. After the molten metal fills the inside of the casting and solidifies, the output ends of the four hydraulic cylinders 11 drive the fixing frame 12 to reset, and the annular scraper 15 scrapes the inner wall of the riser pipe 22 again to reduce the molten metal residue on the inner wall of the riser pipe 22, reduce the probability of the riser pipe 22 being eroded and scrapped, and improve the molding effect of the casting; when the casting is low-pressure casted, the molten metal is added to the inside of the crucible 2, and the crucible 2 is placed at the end of the machine base 1, and the riser pipe 22 is fixed at the center of the connecting frame 21, so that the annular scraper 15 can be inserted into the inner wall of the riser pipe 22 and scraped, and the crucible 2 is sealed at the bottom of the crucible 2 by relying on the sealing component. After plugging, compressed air is injected into the casting part, and the molten metal inside the crucible 2 is sent to the molding mold for casting through the liquid riser 22, which plays a role in low-pressure casting of the casting; when the crucible 2 is blocked for low-pressure casting, the fixed frame 12 is used to drive the square plate 3 to slide down, and the annular scraper 15 cooperates with the sleeve 13 to scrape the inner and outer walls of the liquid riser 22, and the square plate 3 is pressed on the inner wall of the blocking groove 31, and is located at the blocking plate 32 between the crucible 2 and the blocking groove 31. The square plate 3 can block the periphery of the crucible 2, thereby facilitating the low-pressure casting of the crucible 2 by injecting compressed air, and at the same time, the blocking groove 31 can not only be used as a blocking fitting of the square plate 3, but also the blocking groove 31 can The bottom end of the sealing groove 31 can be used as a handle, and the bottom end of the sealing groove 31 can be grasped for easy movement when carrying the crucible 2; when the crucible 2 is injected with gas for low-pressure casting, the compressor 4 is fixed to the bottom end of the fixing frame 12, and after the square plate 3 cooperates with the sealing groove 31 to seal the crucible 2, the output end of the compressor 4 discharges compressed gas, and the gas enters the interior of the air guide plate 41, and the gas is sent downward by a plurality of gas outlets 42, and is discharged from the air holes 43 opened by the gas outlets 42. The compressor 4 is arranged inside the square plate 3, replacing the traditional external gas injection method, which not only improves the gas injection speed, but also reduces the leakage of compressed air, thereby improving the molding effect of the casting;When compressed air is injected into the crucible 2, since the inner cavity of the square plate 3 is large, more compressed air needs to be injected. The sliding plate 5 is slidably installed in the middle of the square plate 3 as a partition to reduce the amount of gas required at the crucible 2. When the square plate 3 slides down to block the crucible 2, multiple push rods 52 can lift the sliding plate 5 and slide it up, so that the air outlet tube 42 passes through the matching hole 51, and the air hole 43 is exposed under the sliding plate 5. The compressor 4 works to generate compressed gas and deliver it to the crucible 2, thereby increasing the injection speed of the compressed gas, thereby increasing the molding speed of the casting. At the same time, the sliding plate 5 can shield and protect the compressor 4, reducing the situation where the molten metal adheres to the compressor 4;

[0039] When the crucible 2 is sealed for low-pressure casting, one of the most important aspects of low-pressure casting is sealing. It is easy to leak air if the square plate 3 and the sealing groove 31 are used for sealing. Water is added to the water storage chamber 6, and the water pump 61 draws the water at the water storage chamber 6 and sends it to the guide groove 62. The water flows along the flow groove 63 to the sealing plate 32 for temporary storage. The square plate 3 is pressed on the sealing plate 32 for sealing, and the water is used to surround the joint between the square plate 3 and the sealing groove 31, thereby improving the sealing effect of the crucible 2. When the casting is completed and the molten metal in the crucible 2 is used up, part of the molten metal adheres to the inner wall of the crucible 2 and easily causes erosion. The output power of the water pump 61 is set to two gears. When the power is in the first gear, the water pumped to the guide groove 62 can be blocked by the diversion component, and the water flows from the flow groove 63 to the sealing plate 32 for temporary storage. When the power is in the second gear, the water pumped to the guide groove 62 can be blocked by the diversion component. The water at the flow slot 62 can flush the diversion component to the top, so that the water reaches the DC nozzle 71 through the circulation pipe 7 to spray the inner wall of the square crucible 2. Note that multiple circulation slots 63 need to be blocked to flush the molten metal attached to the inner wall of the crucible 2; when flushing the inner wall of the crucible 2, the output power of the water pump 61 is set to the second gear, and the water pump 61 draws water to flush the blocking block 81 and slide it to the top. The elastic pull rope 82 on the limit block 8 pulls the blocking block 81 to stretch the force, and the water is passed from the circulation pipe 7 to the DC nozzle 71 for spraying, which can flush and clean the inner wall of the crucible 2. When the output power of the water pump 61 is set to the first gear, the pumped water can flush the limit block 8 and slide it up to just cross the circulation slot 63. The elastic pull rope 82 pulls the blocking block 81 to open the circulation slot 63, and the circulation pipe 7 is blocked, which plays a role in diverting the extracted water;

[0040] When the water pumped from the guide groove 62 is diverted, the extrusion block 9 is used to slide on the guide groove 62 to increase the resistance of the blocking block 81 to slide upward, and reduce the situation where the force generated by the pumping from the guide groove 62 is too large and is sprayed from the DC nozzle 71, thereby causing water to enter the molten metal and affect the casting molding. When it is necessary to rinse the inner wall of the crucible 2, the water pump 61 in the second gear pumps water to flush the blocking block 81 to squeeze the extrusion block 9, so that the extrusion block 9 squeezes the elastic member 91 to contract, and finally water is sprayed from the DC nozzle 71 to rinse the inner wall of the crucible 2 to clean it;

[0041] When the crucible 2 filled with molten metal is placed on the machine base 1, the crucible 2 is limited by the No. 1 limiting plate 92 fixed to the end of the machine base 1, and the crucible 2 is pushed in through the opening of the No. 1 limiting plate 92. The crucible 2 is guided and placed by relying on the inclined surface of the No. 1 limiting plate 92, so that the rising tube 22 on the crucible 2 can be placed corresponding to the annular scraper 15. However, the four L-shaped No. 2 limiting plates 93 on the fixed frame 12 are respectively located at the four corners of the top of the fixed frame 12 and are arranged in a square shape for limiting the placement of the forming mold.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low pressure casting machine, characterized in that: The invention comprises a machine base (1); a plurality of hydraulic cylinders (11) are fixedly connected to the top of the machine base (1); a fixing frame (12) is fixedly connected to the output ends of the plurality of hydraulic cylinders (11); a sleeve (13) is fixedly connected to the central inner wall of the fixing frame (12), and the bottom end of the sleeve (13) is arranged at an angle; a connecting rod (14) is fixedly connected to the inner wall of the sleeve (13); an annular scraper (15) is fixedly connected to the bottom end of the connecting rod (14); a casting mechanism is arranged at the end of the machine base (1) and below the fixing frame (12), and the casting mechanism is used for low-pressure casting of castings; a liquid riser (22) is arranged on the casting mechanism, and the liquid riser (22) is arranged below the annular scraper (15); a gas injection assembly is arranged at the bottom end of the fixing frame (12), and the gas injection assembly is used for injecting gas for casting; The casting mechanism comprises a crucible (2), a connecting frame (21) and a plugging assembly; the crucible (2) is arranged at the end of a machine base (1); the connecting frame (21) is fixedly connected to the inner wall of the top end of the crucible (2), and the riser pipe (22) is fixedly connected to the center of the connecting frame (21); the plugging assembly is arranged at the bottom end of the fixing frame (12), and is used to plug the crucible (2); The blocking assembly comprises a square plate (3) and a blocking groove (31); the square plate (3) is fixedly connected to the bottom end of the fixing frame (12); the blocking groove (31) is fixedly connected to the outside of the crucible (2); a blocking plate (32) is arranged between the crucible (2) and the blocking groove (31), and the square plate (3) and the blocking plate (32) are arranged correspondingly; The gas injection assembly comprises a compressor (4), an air guide plate (41) and an air outlet cylinder (42); the compressor (4) is fixedly connected to the bottom end of the fixing frame (12) and is located inside the square plate (3); the air guide plate (41) is fixedly connected to the output end of the compressor (4); a plurality of air outlet cylinders (42) are fixedly connected to the bottom end of the air guide plate (41); air holes (43) are provided inside the plurality of air outlet cylinders (42), and the plurality of air outlet cylinders (42) can be connected to the output end of the compressor (4) through the air guide plate (41); The inner wall of the square plate (3) is slidably connected to a sliding plate (5); a plurality of matching holes (51) are provided on the sliding plate (5), and the plurality of matching holes (51) are arranged corresponding to the plurality of gas outlets (42); a plurality of push rods (52) are fixedly connected to the top end of the crucible (2), and the plurality of push rods (52) are located below the sliding plate (5).

2. A low pressure casting machine according to claim 1, characterized in that: A water storage chamber (6) is provided inside the crucible (2); a water pump (61) is fixedly connected inside the crucible (2) and located at the water storage chamber (6); a plurality of guide grooves (62) are provided inside the crucible (2) and located above the water storage chamber (6); a plurality of flow grooves (63) are provided outside the crucible (2) and located at the sealing plate (32), and the plurality of flow grooves (63) can be connected to an output end of the water pump (61) through the plurality of guide grooves (62).

3. A low pressure casting machine according to claim 2, characterized in that: A plurality of flow tubes (7) are fixedly connected to the inner wall of the crucible (2) and close to the guide groove (62); a plurality of direct current nozzles (71) are fixedly connected to the bottom end of the connecting frame (21) and in contact with the inner wall of the crucible (2), and the direct current nozzles (71) can be connected to the guide groove (62) through the flow tubes (7); and a flow diversion component is arranged inside the crucible (2), and the flow diversion component is used to divert water extracted by the water pump (61).

4. A low pressure casting machine according to claim 3, characterized in that: The flow diversion component comprises a limit block (8), a blocking block (81) and an elastic pull rope (82); the limit block (8) is fixedly connected to the inside of the crucible (2), and the limit block (8) is located at the flow slot (63); the blocking block (81) is slidably connected to the inner wall of the crucible (2), and the blocking block (81) is located above the limit block (8); the elastic pull rope (82) is fixedly connected to the outside of the limit block (8), and one end of the elastic pull rope (82) away from the limit block (8) is fixedly connected to the bottom end of the blocking block (81).

5. A low pressure casting machine according to claim 3, characterized in that: An extrusion block (9) is slidably connected to the inner wall of the crucible (2) near the circulation tube (7); an elastic member (91) is fixedly connected between the extrusion block (9) and the inner wall of the crucible (2).

6. A low pressure casting machine according to claim 3, characterized in that: A first limiting plate (92) is fixedly connected to the end of the machine base (1), and an opening on one side of the first limiting plate (92) is provided with an inclined surface; four second limiting plates (93) are fixedly connected to the interior of the fixing frame (12), the four second limiting plates (93) are arranged in a square shape, and the cross-section shape of the four second limiting plates (93) is L-shaped.

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