High-quality aluminum alloy low-pressure casting equipment

Abstract

The invention relates to high-quality aluminum alloy low-pressure casting equipment, and belongs to the technical field of low-pressure casting, the high-quality aluminum alloy low-pressure casting equipment comprises a workbench, a fixing frame, a lower mold, an upper mold, a lifting air cylinder, a mounting plate, a fixing mechanism, a boosting mechanism, a heat preservation barrel, a crucible and a liquid adding pipe, and further comprises a positioning mechanism; a liquid lifting mechanism; a transmission mechanism; and a powder adding mechanism. In the process of mold closing and mold splitting, the liquid rising pipe is driven to rotate through the transmission mechanism, the position where molten aluminum impacts the liquid rising pipe when the molten aluminum is injected into the crucible through the liquid adding pipe is changed, meanwhile, the probability that the pipe wall of the liquid rising pipe is eroded and perforated, sealing leakage or internal nodulation occurs is reduced, the liquid rising pipe is well protected, and the service life of the liquid rising pipe is prolonged. The probability that air holes exist in the aluminum alloy part subjected to low-pressure casting and the density cannot meet the requirement is reduced, the quality of the produced aluminum alloy part is guaranteed, and the service life of the riser tube is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of low-pressure casting, and in particular relates to high-quality aluminum alloy low-pressure casting equipment. Background Art

[0002] Low-pressure casting (LPD) of aluminum alloys is a precision casting method between gravity casting and high-pressure casting. It is particularly suitable for producing medium-to-large, thin-walled aluminum alloy parts with high quality requirements, complex shapes, and good density. It is widely used in the automotive, aerospace, motorcycle and other fields. Its core principle is as follows: counter-gravity filling: the molten aluminum alloy is stored in a sealed, insulated crucible (furnace chamber). Dry compressed air or an inert gas (such as nitrogen) is introduced into the crucible, exerting a low pressure (usually between 20-100 kPa) on the closed metal surface. A riser tube is inserted into the crucible, and its top is connected to the mold cavity located above. Under the action of gas pressure, the molten metal rises steadily along the riser tube and is injected into the mold cavity. After the molten metal fills the mold cavity, the gas pressure is maintained or even increased for a period of time until the casting is completely (or mostly) solidified. After the casting solidifies, the gas pressure in the crucible is removed, and the unsolidified molten metal in the riser tube and runner flows back into the crucible under the action of gravity. The mold is then opened and the casting is removed.

[0003] At present, when the existing low-pressure casting equipment is in use, the high-temperature aluminum liquid will flush one side of the liquid inlet end of the riser tube for a long time when adding high-temperature aluminum liquid, which will cause tube wall erosion and perforation, seal leakage or internal nodules on one side of the liquid inlet end of the riser tube, causing the riser tube to fail, resulting in the presence of pores in the low-pressure cast aluminum alloy parts and the density failing to meet the requirements. Based on this, a high-quality aluminum alloy low-pressure casting equipment is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a reasonably designed high-quality aluminum alloy low-pressure casting equipment in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: A high-quality aluminum alloy low-pressure casting equipment, including a workbench, a fixing frame, a lower mold, an upper mold, a lifting cylinder, a mounting plate, a fixing mechanism, a boosting mechanism, a heat preservation barrel, a crucible and a liquid adding pipe, and also includes: A positioning mechanism fixedly connected to the lower surface of the mounting plate for positioning the upper mold and the lower mold; The seal is rotatably connected to the liquid lifting mechanism in the middle of the workbench; A transmission mechanism rotatably connected to the heat preservation barrel for rotating the liquid lifting mechanism; A powder adding mechanism fixedly connected to a workbench is used to add powdered manganese into high-temperature molten aluminum.

[0006] As a further optimization scheme of the present invention, the transmission mechanism includes a transmission shaft rotatably connected to the heat-insulating barrel, a worm is fixedly connected to the middle position of the outer surface of the transmission shaft, both ends of the transmission shaft are fixedly connected to a fixing ring, both sides of the fixing ring are fixedly connected to a limiting plate, a notch is provided on the outer surface of the fixing ring, a directional plate is fitted in the notch, a second telescopic rod is fixedly connected to one side of the directional plate, a connecting spring is sleeved on the outer surface of the second telescopic rod, a gear ring is fixedly connected to the end of the second telescopic rod, the gear ring is rotatably connected to the limiting plate, and the two ends of the connecting spring are fixedly connected to the directional plate and the gear ring respectively.

[0007] As a further optimization scheme of the present invention, the liquid lifting mechanism includes a liquid lifting tube that is rotatably connected to the top of the workbench, the outer surface of the liquid lifting tube is fixedly connected to a worm gear, the bottom of the liquid lifting tube is fixedly connected to a stirring plate, a casting hole is opened at the bottom of the lower mold, and the top end of the liquid lifting tube is sealed and fits with the inner surface of the casting hole.

[0008] As a further optimized solution of the present invention, the outer surface of the stirring plate is in contact with the inner surface of the crucible, and the worm wheel is meshed with the worm.

[0009] As a further optimization scheme of the present invention, the powder adding mechanism includes a powder storage tank installed on the top of the workbench, the bottom of the powder storage tank is fixedly connected to a powder injection pipe, a fixed bin is fixedly connected to the insulation barrel, the powder injection pipe is fixedly connected to the fixed bin, the outer surface of the rising pipe is fixedly connected to a turntable, the outer surface of the turntable is in contact with the inner surface of the fixed bin, a powder adding hole is opened through the turntable, and a release hole is opened at the bottom of the fixed bin, and the release hole has the same size as the powder adding hole.

[0010] As a further optimization solution of the present invention, the liquid rising pipe passes through the fixed bin and is sealed and rotatably connected to the fixed bin, and the powder injection pipe passes through the insulation barrel and is fixedly connected to the insulation barrel.

[0011] As a further optimization scheme of the present invention, the positioning mechanism includes two groups of upper positioning rods fixedly connected to the bottom of the mounting plate, the upper mold is provided with an upper positioning hole that fits the outer surface of the upper positioning rod, the bottom of the workbench is fixedly connected to two first telescopic rods, the outer surface of the first telescopic rod is sleeved with a return spring, the bottoms of the two first telescopic rods are fixedly connected to a connecting plate, the two ends of the return spring are respectively fixedly connected to the connecting plate and the workbench, the top two ends of the connecting plate are fixedly connected to the lower positioning rod, the lower positioning rod passes through the workbench and is sealed and slidably connected to the workbench, the lower mold is provided with a lower positioning hole that fits the outer surface of the lower positioning rod, the bottom of one of the connecting plates is fixedly connected to the first tooth rod, and the bottom of the other connecting plate is fixedly connected to the second tooth rod, and the first tooth rod and the second tooth rod are both meshed with the gear ring.

[0012] As a further optimization scheme of the present invention, the fixed frame is fixedly connected to the top of the workbench, the lower mold is installed on the top of the workbench, the lifting cylinder is fixedly connected to the fixed frame, the mounting plate is fixedly connected to the output end of the lifting cylinder, the upper mold is mounted on the lower surface of the mounting plate through a fixing mechanism, and exhaust holes are opened through the upper mold and the mounting plate. The insulation barrel is fixedly connected to the workbench, the crucible is installed in the insulation barrel, and the bottom of the crucible is fixedly connected to a drain pipe, the drain pipe passes through the insulation barrel and is sealed with the insulation barrel, the discharge end of the liquid adding pipe is located in the crucible, and the liquid adding pipe is fixedly connected to the side wall of the insulation barrel.

[0013] As a further optimization solution of the present invention, the fixing mechanism includes a fixed cylinder fixedly connected to the mounting plate, the output end of the fixed cylinder is fixedly connected to the fixed plate, and the fixed plate is in contact with the bottom of the upper mold.

[0014] As a further optimization scheme of the present invention, the boosting mechanism includes an air pump fixedly connected to the side wall of the workbench, one end of the air pump is fixedly connected to an air inlet pipe, and the other end of the air pump is fixedly connected to an air injection pipe, and the air injection pipe is fixedly connected to the insulation barrel.

[0015] The beneficial effects of the present invention are: 1. During the mold closing and parting processes, the present invention drives the riser tube to rotate through the transmission mechanism, thereby changing the position where the molten aluminum impacts the riser tube when the molten aluminum is injected into the crucible through the liquid adding tube. At the same time, the probability of the riser tube suffering from tube wall erosion and perforation, seal leakage, or internal nodules is reduced, thereby providing good protection for the riser tube, reducing the probability of the presence of pores in the low-pressure cast aluminum alloy parts and the density failing to meet the requirements, thereby ensuring the quality of the produced aluminum alloy parts and extending the service life of the riser tube.

[0016] 2. The present invention realizes the positioning function of the upper mold and the lower mold through the setting of the positioning mechanism, on the one hand, ensuring the accuracy of the upper mold and the lower mold closing, thereby ensuring the quality of the aluminum alloy parts obtained by low-pressure casting; on the other hand, it can provide stable power for the transmission mechanism, so that the transmission mechanism can only rotate in one direction, thereby ensuring the unidirectional rotation of the riser tube, so as to achieve the purpose of changing the position of the riser tube.

[0017] 3. The present invention sets up a powder adding mechanism. During every four mold splitting processes, the release mechanism will add a small amount of manganese powder into the aluminum liquid through the release hole. The manganese powder is mixed with the aluminum liquid under the stirring action of the stirring plate, so that the iron elements generated by the corrosion of the crucible by the aluminum liquid combine with the manganese powder to form a block or skeleton shape. phase, replacing harmful needle-like Phase, in order to achieve the purpose of improving the toughness and processing properties of the alloy, reduce the probability of iron elements affecting the aluminum alloy after the crucible is corroded, thereby further ensuring the quality of the cast aluminum alloy parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall front three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional top structure of the heat preservation bucket of the present invention; Figure 3 This is a schematic diagram of a three-dimensional partially cutaway structure of the heat preservation barrel of the present invention; Figure 4 This is a schematic diagram of the three-dimensional bottom-up structure of the positioning mechanism of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the liquid lifting mechanism of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the transmission mechanism of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the gear ring of the present invention; Figure 8 It is a schematic diagram of the structure of the present invention with the middle part cut away from the side; Figure 9 It is an oblique cross-sectional structural schematic diagram of the present invention.

[0019] In the figure: 1. workbench; 2. fixing frame; 3. lower mold; 4. lifting cylinder; 5. mounting plate; 6. fixing cylinder; 7. fixing plate; 8. upper mold; 9. exhaust hole; 10. air pump; 11. air inlet pipe; 12. air injection pipe; 13. heat preservation barrel; 14. crucible; 15. liquid adding pipe; 16. positioning mechanism; 161. upper positioning rod; 162. upper positioning hole; 163. lower positioning hole; 164. lower positioning rod; 165. connecting plate; 166. first telescopic rod; 167. return spring; 168. first tooth rod; 169. first Two-tooth rod; 17. Liquid lifting mechanism; 171. Liquid lifting pipe; 172. Stirring plate; 173. Worm gear; 174. Casting hole; 18. Transmission mechanism; 181. Transmission shaft; 182. Worm; 183. Fixed ring; 184. Limit plate; 185. Notch; 186. Orienting plate; 187. Second telescopic rod; 188. Connecting spring; 189. Gear ring; 19. Powder adding mechanism; 191. Powder storage tank; 192. Powder injection pipe; 193. Fixed bin; 194. Turntable; 195. Powder adding hole; 196. Release hole; 20. Drain pipe. DETAILED DESCRIPTION

[0020] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 and Figure 9As shown, a high-quality aluminum alloy low-pressure casting equipment includes a workbench 1, a fixing frame 2, a lower mold 3, an upper mold 8, a lifting cylinder 4, a mounting plate 5, a fixing mechanism, a boosting mechanism, a heat preservation barrel 13, a crucible 14 and a liquid adding pipe 15. The fixing frame 2 is fixedly connected to the top of the workbench 1, the lower mold 3 is mounted on the top of the workbench 1, the lifting cylinder 4 is fixedly connected to the fixing frame 2, the mounting plate 5 is fixedly connected to the output end of the lifting cylinder 4, the upper mold 8 is mounted on the lower surface of the mounting plate 5 through the fixing mechanism, the fixing mechanism includes a fixing cylinder 6 fixedly connected to the mounting plate 5, and the fixing cylinder 6 The output end is fixedly connected to a fixing plate 7, which fits the bottom of the upper mold 8. The upper mold 8 and the mounting plate 5 are both penetrated with exhaust holes 9. The insulation barrel 13 is fixedly connected to the workbench 1. A heating device is installed in the insulation barrel 13 (the heating device is a prior art, not shown in the figure, and will not be described in detail). The crucible 14 is installed in the insulation barrel 13. The bottom of the crucible 14 is fixedly connected to a drain pipe 20. The drain pipe 20 penetrates the insulation barrel 13 and is sealed with the insulation barrel 13. When the crucible 14 needs to be cleaned, the valve in the drain pipe 20 is opened and liquid is poured into the crucible 14 through the liquid adding pipe 15. Add cleaning liquid and start the heating device in the insulation barrel 13 for heating. The discharge end of the liquid adding pipe 15 is located in the crucible 14. An electric valve is installed in the liquid adding pipe 15 to seal the liquid adding pipe 15 after the aluminum liquid is added. The liquid adding pipe 15 is fixedly connected to the side wall of the insulation barrel 13. The boosting mechanism includes an air pump 10 fixedly connected to the side wall of the workbench 1. One end of the air pump 10 is fixedly connected to the air inlet pipe 11, and the air inlet pipe 11 is fixedly connected to the gas storage tank (the gas storage tank is a prior art, not shown in the figure, and will not be described in detail. The gas in the gas storage tank can be air or inert gas. The other end of the air pump 10 is fixedly connected to the air injection pipe 12, and the air injection pipe 12 is fixedly connected to the heat preservation barrel 13. The middle position of the workbench 1 is sealed and rotatably connected to the liquid lifting mechanism 17. The liquid lifting mechanism 17 includes a liquid lifting pipe 171 that is rotatably connected to the top of the workbench 1. The outer surface of the liquid lifting pipe 171 is fixedly connected to a worm gear 173, and the bottom of the liquid lifting pipe 171 is fixedly connected to a stirring plate 172. The outer surface of the stirring plate 172 is in contact with the inner surface of the crucible 14. A casting hole 174 is provided at the bottom of the lower mold 3, and the top of the liquid lifting pipe 171 is in sealing contact with the inner surface of the casting hole 174.

[0022] When in use, the lower mold 3 is installed on the top of the workbench 1, and the liquid rising pipe 171 is sealed and inserted into the casting hole 174, and then the upper mold 8 is installed under the mounting plate 5 through the fixed cylinder 6 and the fixed plate 7. At this time, the lifting cylinder 4 can be started to move the upper mold 8 downward into the lower mold 3 to complete the mold closing operation. At this time, the liquid adding pipe 15 can be opened to add a sufficient amount of aluminum liquid into the crucible 14 through the liquid adding pipe 15. After the aluminum liquid is added, the liquid adding pipe 15 can be closed and the air pump 10 can be started to allow the air pump 10 to extract the gas inside the gas storage tank through the air inlet pipe 11 and inject it into the insulation barrel 13 through the air injection pipe 12, so that the high-temperature aluminum liquid in the crucible 14 is heated by the air inlet pipe 11. Under the action of pressure, the aluminum liquid is injected into the space between the upper mold 8 and the lower mold 3 through the casting hole 174 through the liquid rising pipe 171. After the upper mold 8 and the lower mold 3 are filled, the pressure is maintained until the casting in the mold is completely solidified or mostly solidified. Then the liquid adding pipe 15 can be opened to restore the air pressure in the insulation barrel 13 (it should be noted that even in the last casting, during the pressure maintaining process, there is still aluminum liquid in the crucible 14 that submerges the liquid inlet end of the liquid rising pipe 171 to prevent air from entering the casting). The aluminum liquid in the liquid rising pipe 171 flows back to the crucible 14. After the casting is cooled to a certain temperature, the lifting cylinder 4 can be started to move the upper mold 8 upward, and the casting can be removed, completing the casting operation of the aluminum alloy part.

[0023] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 9 As shown, the lower surface of the mounting plate 5 is fixedly connected to a positioning mechanism 16 for positioning the upper mold 8 and the lower mold 3. The positioning mechanism 16 includes two groups of upper positioning rods 161 fixedly connected to the bottom of the mounting plate 5. Each group has two upper positioning rods 161. The upper mold 8 is provided with an upper positioning hole 162 that fits with the outer surface of the upper positioning rod 161. The bottom of the workbench 1 is fixedly connected to two first telescopic rods 166. The outer surface of the first telescopic rod 166 is provided with a reset spring 167. The bottoms of the two first telescopic rods 166 are fixedly connected to a connecting plate 165. The reset spring 167 is provided on the outer surface of the first telescopic rod 166. The two ends of the spring 167 are fixedly connected to the connecting plate 165 and the workbench 1 respectively. The top two ends of the connecting plate 165 are fixedly connected with lower positioning rods 164. There are four lower positioning rods 164, which are opposite to the upper positioning rod 161. The lower positioning rod 164 passes through the workbench 1 and is sealed and slidably connected to the workbench 1. A lower positioning hole 163 is opened on the lower mold 3 and fits with the outer surface of the lower positioning rod 164. The bottom of one of the connecting plates 165 is fixedly connected to the first tooth rod 168, and the bottom of the other connecting plate 165 is fixedly connected to the second tooth rod 169.

[0024] When installing the lower mold 3, the lower positioning hole 163 opened on the lower mold 3 is aligned with the lower positioning rod 164, and when installing the upper mold 8, the upper positioning hole 162 opened on the upper mold 8 is aligned with the upper positioning rod 161. When closing the mold, the upper positioning rod 161 will be inserted into the lower positioning hole 163, thereby ensuring that the upper mold 8 and the lower mold 3 can be accurately closed, thereby ensuring that the size of the produced aluminum alloy casting meets the regulations and ensuring the quality of the produced aluminum alloy casting.

[0025] like Figure 2 、 Figure 3 、 Figure 6 and Figure 7 As shown, a transmission mechanism 18 for rotating the liquid lifting mechanism 17 is rotatably connected in the heat preservation barrel 13. The transmission mechanism 18 includes a transmission shaft 181 rotatably connected in the heat preservation barrel 13. A worm 182 is fixedly connected to the middle position of the outer surface of the transmission shaft 181. The worm wheel 173 is engaged with the worm 182. Both ends of the transmission shaft 181 are fixedly connected to a fixing ring 183. Both sides of the fixing ring 183 are fixedly connected to a limit plate 184. The outer surface of the fixing ring 183 is provided with a notch 184. 5. An oriented plate 186 is fitted into the slot 185. A second telescopic rod 187 is fixedly connected to one side of the oriented plate 186. A connecting spring 188 is sleeved on the outer surface of the second telescopic rod 187. A toothed ring 189 is fixedly connected to the end of the second telescopic rod 187. Both the first toothed rod 168 and the second toothed rod 169 are engaged with the toothed ring 189. The toothed ring 189 is rotatably connected to the limit plate 184. The two ends of the connecting spring 188 are fixedly connected to the oriented plate 186 and the toothed ring 189, respectively.

[0026] When in use, when the upper positioning rod 161 is inserted into the lower positioning hole 163 for mold closing, the lower positioning rod 164 will be pushed downward, causing the connecting plate 165 to move downward. At this time, the first telescopic rod 166 will extend, the return spring 167 will be stretched, and the first tooth rod 168 and the second tooth rod 169 will drive the gear ring 189 to rotate. The first tooth rod 168 drives the gear ring 189 to rotate clockwise, and the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the notch 185 drive the fixing ring 183 to rotate clockwise. This is because when the first tooth rod 168 drives the gear ring 189 to rotate clockwise, the second telescopic rod 187 will drive the directional plate 186 to be unable to slide out of the notch 185 and then drive the fixing ring 183 to rotate clockwise, and the second tooth rod 169 drives the gear ring 189 to rotate clockwise. 183 is rotated counterclockwise, the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the notch 185 cannot drive the fixing ring 183 to rotate. This is because when the second tooth rod 169 drives the tooth ring 189 to rotate counterclockwise, the second telescopic rod 187 will drive the directional plate 186 to slide out of the notch 185 and cannot drive the fixing ring 183 to rotate. Therefore, during the downward movement of the first tooth rod 168, the transmission shaft 181 is driven to rotate clockwise, so that the worm 182 drives the riser tube 171 to rotate through the worm gear 173, thereby changing the position where the aluminum liquid impacts the riser tube 171 when the aluminum liquid is injected into the crucible 14 through the liquid adding pipe 15. At the same time, the probability of tube wall erosion and perforation, seal leakage or internal nodule of the riser tube 171 is reduced, thereby well protecting the riser tube 171 and extending the service life of the riser tube 171. During the mold separation process, due to the upward movement of the upper positioning rod 161, the connecting plate 165 will move upward under the action of the first telescopic rod 166 and the return spring 167, thereby driving the first tooth rod 168 and the second tooth rod 169 to move upward, and the tooth ring 189 driven by the second tooth rod 169 rotates clockwise, which will drive the fixing ring 183 to rotate clockwise through the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the slot 185. This is because when the second tooth rod 169 drives the tooth ring 189 to rotate clockwise, the second telescopic rod 187 will drive the directional plate 186 to be unable to slide out of the slot 185 and thereby drive the fixing ring 183 to rotate clockwise, while the first tooth rod 168 drives the tooth ring 189 to rotate counterclockwise, and cannot be The opening 185 drives the fixing ring 183 to rotate. This is because when the first tooth rod 168 drives the tooth ring 189 to rotate counterclockwise, the second telescopic rod 187 will drive the directional plate 186 to slide out of the notch 185 and cannot drive the fixing ring 183 to rotate. Therefore, during the downward movement of the second tooth rod 169, the transmission shaft 181 will be driven to rotate clockwise. At this time, the rotation direction of the transmission shaft 181 is the same as the direction in which the first tooth rod 168 drives the transmission shaft 181 to rotate when it moves downward, so that the worm 182 drives the riser tube 171 to rotate through the worm gear 173, thereby changing the position where the aluminum liquid impacts the riser tube 171 when the aluminum liquid is injected into the crucible 14 through the liquid adding pipe 15, and at the same time reducing the probability of tube wall erosion and perforation, seal leakage or internal nodule formation in the riser tube 171, thereby well protecting the riser tube 171 and extending the service life of the riser tube 171. In addition, the rotation of the riser tube 171 can ensure that the aluminum liquid at the discharge port of the riser tube 171 is separated from the aluminum alloy casting, thereby facilitating the rapid demoulding of the cast aluminum alloy part from the mold.

[0027] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 9As shown, a powder adding mechanism 19 for adding powdered manganese to the high-temperature aluminum liquid is fixedly connected to the workbench 1. The powder adding mechanism 19 includes a powder storage tank 191 installed on the top of the workbench 1. The bottom of the powder storage tank 191 is fixedly connected to a powder injection pipe 192. A one-way valve is installed in the powder injection pipe 192, so that manganese powder can only flow to the powder adding hole 195 through the powder storage tank 191. The powder injection pipe 192 passes through the insulation barrel 13 and is fixedly connected to the insulation barrel 13. The fixed bin 193, the rising liquid pipe 171 passes through the fixed bin 193 and is sealed and rotatably connected to the fixed bin 193, the powder injection pipe 192 is fixedly connected to the fixed bin 193, the outer surface of the rising liquid pipe 171 is fixedly connected to the turntable 194, the outer surface of the turntable 194 is in contact with the inner surface of the fixed bin 193, and a powder adding hole 195 is opened through the turntable 194. The bottom of the fixed bin 193 is provided with a release hole 196, and the release hole 196 has the same size as the powder adding hole 195.

[0028] At the beginning of use, manganese powder is added to the powder storage tank 191, and the manganese powder in the powder storage tank 191 will enter the powder adding hole 195 opened on the turntable 194 through the powder injection tube 192. During the fourth mold separation process, the rotation of the liquid riser 171 will drive the turntable 194 to rotate. At this time, the powder adding hole 195 will rotate to the position of the release hole 196. When the upper positioning rod 161 cannot push the lower positioning rod 164, the powder adding hole 195 is completely opposite to the release hole 196. At this time, the manganese powder in the powder adding hole 195 is completely released into the aluminum liquid through the release hole 196. When the liquid riser 171 rotates next time, the liquid riser 171 will drive the stirring plate 172 to rotate, stirring the aluminum liquid and the manganese powder, so that the aluminum liquid and the manganese powder are mixed, so that the iron element produced by the corrosion of the aluminum liquid in the crucible 14 is combined with the manganese powder to form a block or skeleton shape. phase, replacing harmful needle-like Phase, in order to achieve the purpose of improving the toughness and processing performance of the alloy, reduce the probability of iron elements affecting the aluminum alloy after the crucible 14 is corroded, thereby further ensuring the quality of the aluminum alloy parts obtained by casting.

[0029] The specific working principle of the present invention is as follows: During use, the lower mold 3 is mounted on the top of the workbench 1 so that the lower positioning hole 163 provided on the lower mold 3 is aligned with the lower positioning rod 164, and the liquid riser 171 is sealed and inserted into the casting hole 174. When installing the upper mold 8, the upper positioning hole 162 provided on the upper mold 8 is aligned with the upper positioning rod 161. The upper mold 8 is then mounted below the mounting plate 5 through the fixing cylinder 6 and the fixing plate 7. Manganese powder is then added to the powder storage tank 191. The manganese powder in the powder storage tank 191 will enter the powder adding hole 195 provided on the turntable 194 through the powder injection pipe 192. At this time, the lifting cylinder 4 can be started to move the upper mold 8 downward into the lower mold 3, completing the mold closing operation. When the mold is closed, when the upper positioning rod 161 is inserted into the lower positioning hole 163 to close the mold, the lower positioning rod 164 will be pushed downward, causing the connecting plate 165 to move downward. At this time, the first telescopic rod 166 will extend, the return spring 167 will be stretched, and the first tooth rod 168 and the second tooth rod 169 will drive the gear ring 189 to rotate. The first tooth rod 168 drives the gear ring 189 to rotate clockwise, and the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the notch 185 drive the fixing ring 183 to rotate clockwise. This is because when the first tooth rod 168 drives the gear ring 189 to rotate clockwise, the second telescopic rod 187 will drive the directional plate 186 to be unable to slide out of the notch 185 and then drive the fixing ring 183 to rotate clockwise, and the second tooth rod 169 drives the gear ring 189 to rotate clockwise. 183 is rotated counterclockwise, the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the notch 185 cannot drive the fixing ring 183 to rotate. This is because when the second tooth rod 169 drives the tooth ring 189 to rotate counterclockwise, the second telescopic rod 187 will drive the directional plate 186 to slide out of the notch 185 and cannot drive the fixing ring 183 to rotate. Therefore, during the downward movement of the first tooth rod 168, the transmission shaft 181 is driven to rotate clockwise, so that the worm 182 drives the riser tube 171 to rotate through the worm gear 173, thereby changing the position where the aluminum liquid impacts the riser tube 171 when the aluminum liquid is injected into the crucible 14 through the liquid adding pipe 15. At the same time, the probability of tube wall erosion and perforation, seal leakage or internal nodule of the riser tube 171 is reduced, thereby well protecting the riser tube 171 and extending the service life of the riser tube 171. At this time, the liquid adding pipe 15 can be opened to add a sufficient amount of molten aluminum into the crucible 14 through the liquid adding pipe 15. After the molten aluminum is added, the liquid adding pipe 15 can be closed and the air pump 10 can be started to allow the air pump 10 to extract the gas inside the gas storage tank through the air inlet pipe 11 and inject it into the heat preservation barrel 13 through the air injection pipe 12. Under the action of air pressure, the high-temperature molten aluminum in the crucible 14 is injected into the space between the upper mold 8 and the lower mold 3 through the liquid rising pipe 171 and the casting hole 174. After the upper mold 8 and the lower mold 3 are filled, the pressure is maintained until the casting in the mold is completely solidified or mostly solidified. The liquid adding pipe 15 can be opened to restore the air pressure in the heat preservation barrel 13 (it should be noted that even in the last casting, During the pressure holding process, there is still aluminum liquid in the crucible 14 to grind the liquid inlet end of the liquid riser 171 to prevent air from entering the casting). The aluminum liquid in the liquid riser 171 flows back into the crucible 14. After the casting is cooled to a certain temperature, the lifting cylinder 4 can be started to move the upper mold 8 upward for mold separation. During the mold separation process, due to the upward movement of the upper positioning rod 161, the connecting plate 165 will move upward under the action of the first telescopic rod 166 and the return spring 167, thereby driving the first tooth rod 168 and the second tooth rod 169 to move upward. The gear ring 189 driven by the second tooth rod 169 rotates clockwise, and the gear ring 189 driven by the second telescopic rod 187 and the connecting plate 165 will rotate clockwise. The connecting spring 188, the directional plate 186 and the notch 185 drive the fixing ring 183 to rotate clockwise. This is because when the second tooth rod 169 drives the tooth ring 189 to rotate clockwise, the second telescopic rod 187 will drive the directional plate 186 to be unable to slide out of the notch 185 and thus drive the fixing ring 183 to rotate clockwise, while the first tooth rod 168 drives the tooth ring 189 to rotate counterclockwise, and the fixing ring 183 cannot be driven to rotate by the second telescopic rod 187, the connecting spring 188, the directional plate 186 and the notch 185. This is because when the first tooth rod 168 drives the tooth ring 189 to rotate counterclockwise, the second telescopic rod 187 will drive the directional plate 186 to be unable to slide out of the notch 185 and thus drive the fixing ring 183 to rotate clockwise. The sliding out notch 185 cannot drive the fixing ring 183 to rotate. Therefore, the second tooth rod 169 drives the transmission shaft 181 to rotate clockwise during its downward movement. At this time, the rotation direction of the transmission shaft 181 is the same as the direction in which the first tooth rod 168 drives the transmission shaft 181 to rotate. As a result, the worm 182 drives the riser tube 171 to rotate via the worm gear 173. This changes the position where the molten aluminum impacts the riser tube 171 when the molten aluminum is injected into the crucible 14 through the liquid adding tube 15. At the same time, the probability of the riser tube 171 suffering from tube wall erosion and perforation, seal leakage, or internal nodules is reduced, thereby effectively protecting the riser tube 171 and extending its service life. In addition, the rotation of the riser tube 171 can ensure that the aluminum liquid at the discharge port of the riser tube 171 is separated from the aluminum alloy casting, thereby facilitating the rapid demolding of the cast aluminum alloy part from the mold, and then the casting can be removed, completing the casting operation of the aluminum alloy part. In addition, during every four mold parting processes, the release hole 196 releases manganese powder into the aluminum liquid once. The operation of releasing the manganese powder is as follows: the rotation of the liquid riser 171 will drive the turntable 194 to rotate. At this time, the powder adding hole 195 will rotate to the position of the release hole 196. When the upper positioning rod 161 cannot push the lower positioning rod 164, the powder adding hole 195 is completely opposite to the release hole 196. At this time, the manganese powder in the powder adding hole 195 is completely released into the aluminum liquid through the release hole 196. When the liquid riser 171 rotates next time, the liquid riser 171 will drive the stirring plate 172 to rotate, stirring the aluminum liquid and the manganese powder, so that the aluminum liquid and the manganese powder are mixed, so that the iron element generated by the corrosion of the aluminum liquid on the crucible 14 is combined with the manganese powder to form a block or skeleton shape. phase, replacing harmful needle-like Phase, in order to achieve the purpose of improving the toughness and processing performance of the alloy, reduce the probability of iron elements affecting the aluminum alloy after the crucible 14 is corroded, thereby further ensuring the quality of the aluminum alloy parts obtained by casting.

[0030] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A high-quality aluminum alloy low-pressure casting device, comprising a workbench (1), a fixing frame (2), a lower mold (3), an upper mold (8), a lifting cylinder (4), a mounting plate (5), a fixing mechanism, a boosting mechanism, a heat preservation barrel (13), a crucible (14) and a liquid adding pipe (15), characterized in that: Also includes: A positioning mechanism (16) fixedly connected to the lower surface of the mounting plate (5) for positioning the upper mold (8) and the lower mold (3); A liquid lifting mechanism (17) is sealed and rotatably connected to the middle portion of the workbench (1); A transmission mechanism (18) rotatably connected to the heat preservation barrel (13) for rotating the liquid lifting mechanism (17); A powder adding mechanism (19) is fixedly connected to the workbench (1) and is used to add powdered manganese into the high-temperature aluminum liquid.

2. The high-quality aluminum alloy low-pressure casting equipment according to claim 1, characterized in that: The transmission mechanism (18) includes a transmission shaft (181) rotatably connected to the heat preservation barrel (13); a worm (182) is fixedly connected to the middle of the transmission shaft (181); fixed rings (183) are fixedly connected to both ends of the transmission shaft (181); both sides of the fixed ring (183) are fixedly connected to a limit plate (184); a notch (185) is provided on the outer surface of the fixed ring (183); an orientation plate (186) is fitted into the notch (185); a second telescopic rod (187) is fixedly connected to one side of the orientation plate (186); a connecting spring (188) is sleeved on the outer surface of the second telescopic rod (187); a toothed ring (189) is fixedly connected to the end of the second telescopic rod (187); the toothed ring (189) is rotatably connected to the limit plate (184); and both ends of the connecting spring (188) are fixedly connected to the orientation plate (186) and the toothed ring (189), respectively.

3. The high-quality aluminum alloy low-pressure casting equipment according to claim 2, characterized in that: The liquid lifting mechanism (17) includes a liquid lifting pipe (171) that is rotatably connected to the top of the workbench (1), a worm gear (173) is fixedly connected to the outer surface of the liquid lifting pipe (171), and a stirring plate (172) is fixedly connected to the bottom of the liquid lifting pipe (171). A casting hole (174) is opened at the bottom of the lower mold (3), and the top end of the liquid lifting pipe (171) is sealed and fitted with the inner surface of the casting hole (174).

4. The high-quality aluminum alloy low-pressure casting equipment according to claim 3, characterized in that: The outer surface of the stirring plate (172) is in contact with the inner surface of the crucible (14), and the worm wheel (173) is meshed with the worm (182).

5. The high-quality aluminum alloy low-pressure casting equipment according to claim 3, characterized in that: The powder adding mechanism (19) comprises a powder storage tank (191) mounted on the top of the workbench (1), the bottom of the powder storage tank (191) is fixedly connected to a powder injection pipe (192), a fixed bin (193) is fixedly connected inside the heat preservation barrel (13), the powder injection pipe (192) is fixedly connected to the fixed bin (193), the outer surface of the liquid rising pipe (171) is fixedly connected to a turntable (194), the outer surface of the turntable (194) is in contact with the inner surface of the fixed bin (193), a powder adding hole (195) is formed through the turntable (194), and a release hole (196) is formed at the bottom of the fixed bin (193), and the release hole (196) has the same size as the powder adding hole (195).

6. The high-quality aluminum alloy low-pressure casting equipment according to claim 5, characterized in that: The liquid rising pipe (171) passes through the fixed bin (193) and is sealed and rotatably connected to the fixed bin (193); the powder injection pipe (192) passes through the heat-insulating barrel (13) and is fixedly connected to the heat-insulating barrel (13).

7. The high-quality aluminum alloy low-pressure casting equipment according to claim 2, characterized in that: The positioning mechanism (16) includes two groups of upper positioning rods (161) fixedly connected to the bottom of the mounting plate (5), and an upper positioning hole (162) is provided on the upper mold (8) and is in contact with the outer surface of the upper positioning rod (161). The bottom of the workbench (1) is fixedly connected to two first telescopic rods (166), and the outer surface of the first telescopic rod (166) is provided with a return spring (167). The bottoms of the two first telescopic rods (166) are fixedly connected to a connecting plate (165), and the two ends of the return spring (167) are fixedly connected to the connecting plate (165) and the workbench (1), respectively. Both ends of the top of the connecting plate (165) are fixedly connected to lower positioning rods (164), and the lower positioning rods (164) pass through the workbench (1) and are sealed and slidably connected to the workbench (1). A lower positioning hole (163) is opened on the lower mold (3) and fits with the outer surface of the lower positioning rod (164). The bottom of one of the connecting plates (165) is fixedly connected to a first tooth rod (168), and the bottom of the other connecting plate (165) is fixedly connected to a second tooth rod (169), and the first tooth rod (168) and the second tooth rod (169) are both engaged with the gear ring (189).

8. The high-quality aluminum alloy low-pressure casting equipment according to claim 1, characterized in that: The fixing frame (2) is fixedly connected to the top of the workbench (1), the lower mold (3) is installed on the top of the workbench (1), the lifting cylinder (4) is fixedly connected to the fixing frame (2), the mounting plate (5) is fixedly connected to the output end of the lifting cylinder (4), the upper mold (8) is installed on the lower surface of the mounting plate (5) through a fixing mechanism, and exhaust holes (9) are opened through the upper mold (8) and the mounting plate (5), the insulation barrel (13) is fixedly connected to the workbench (1), the crucible (14) is installed in the insulation barrel (13), the bottom of the crucible (14) is fixedly connected to a drain pipe (20), the drain pipe (20) passes through the insulation barrel (13) and is sealed with the insulation barrel (13), the discharge end of the liquid adding pipe (15) is located in the crucible (14), and the liquid adding pipe (15) is fixedly connected to the side wall of the insulation barrel (13).

9. The high-quality aluminum alloy low-pressure casting equipment according to claim 1, characterized in that: The fixing mechanism comprises a fixed cylinder (6) fixedly connected to the mounting plate (5), the output end of the fixed cylinder (6) is fixedly connected to a fixed plate (7), and the fixed plate (7) is fitted with the bottom of the upper mold (8).

10. The high-quality aluminum alloy low-pressure casting equipment according to claim 1, characterized in that: The boosting mechanism comprises an air pump (10) fixedly connected to the side wall of the workbench (1), one end of the air pump (10) is fixedly connected to an air inlet pipe (11), the other end of the air pump (10) is fixedly connected to an air injection pipe (12), and the air injection pipe (12) is fixedly connected to a heat preservation barrel (13).

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