Low-pressure casting forming device for alloy component

Abstract

The invention belongs to the technical field of low-pressure casting, and particularly relates to an alloy component low-pressure casting forming device which comprises a shell, a casting mold mechanism, a transmission mechanism and a linkage ejection mechanism. A vertical liquid rising pipe is arranged in the center of the top of the shell in a penetrating mode and conveys liquid metal through a low-pressure conveying mechanism; a fixing ring is fixedly arranged on the outer side of the upper end of the riser tube; the casting mold mechanism is arranged above the shell, communicates with the liquid rising pipe and is used for casting liquid metal into a component. According to the mold, through linkage of the transmission mechanism and the driving mechanism, when the upper mold ascends, the lower half mold automatically rotates in the opposite direction through gear transmission, rapid opening of a sealed cavity is achieved, and the production efficiency is improved; and small-amplitude rotation of the rotating shaft is converted into rapid vertical movement of the ejector rod, so that a casting can be ejected out after mold opening, and subsequent operation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-pressure casting, and particularly to a device for forming alloy components by low-pressure casting. Background Art

[0002] Low-pressure casting is an advanced process widely used in the forming of alloy components such as aluminum alloys. Molten metal is pressed from a sealed heat-insulating furnace into a mold cavity by compressed gas to form a dense casting.

[0003] After the casting is formed in the mold, the mold usually needs to be opened. After the casting is exposed, the casting is removed manually or by an independent ejection mechanism. Usually, the steps are cumbersome and the casting cannot be directly ejected when the mold is opened. Therefore, it is necessary to develop a device for forming alloy components by low-pressure casting. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title of the invention. However, such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided:

[0006] A device for forming alloy components by low-pressure casting, which includes a housing, a casting mold mechanism, a transmission mechanism, and a linkage ejection mechanism:

[0007] A vertical lifting tube is penetrated through the center of the top of the housing. The lifting tube transports liquid metal through a low-pressure conveying mechanism. A fixed ring is fixedly arranged on the outer side of the upper end of the lifting tube;

[0008] The casting mold mechanism is arranged above the housing and is connected to the lifting tube for casting liquid metal into components. It includes an upper mold that is lifted and lowered above the housing through a driving mechanism, and two lower half molds that are symmetrically rotatably arranged below the upper mold. When the upper mold and the two lower half molds are closed, a sealed cavity for casting components is formed. The fixed ring is located in the sealed cavity and its upper surface is coplanar with the lower surface of the sealed cavity;

[0009] The transmission mechanism is arranged behind the casting mold mechanism and is used to control the two lower half molds to rotate in opposite directions to open the sealed cavity while the upper mold rises after the component casting is completed;

[0010] The linkage ejection mechanism is arranged between the housing and the lower half mold and is used to eject the cast component after the sealed cavity is opened.

[0011] As a preferred solution of the low-pressure casting forming device for alloy components described in the present invention, the low-pressure conveying mechanism includes a crucible fixed in the inner cavity of the shell, the lower end of the riser is connected to the inner cavity of the crucible, one side of the shell is fixedly provided with an air inlet pipe connected to the inner cavity of the crucible for injecting gas, the other end of the air inlet pipe is connected to the air delivery end of the air pump, the air inlet end of the air pump is connected to a connecting pipe, the other end of the connecting pipe is connected to the inner cavity of a gas storage tank, the interior of the gas storage tank stores dry compressed gas, and a control valve is arranged on the connecting pipe; the other side of the shell is provided with a feeding pipe connected to the inner cavity of the crucible for injecting liquid metal.

[0012] As a preferred solution of the low-pressure casting forming device for alloy components described in the present invention, the driving mechanism includes a "冂"-shaped bracket fixed to the top of the shell, a vertical electric cylinder is fixed on the top of the bracket, and the output rod of the electric cylinder slides through the top of the bracket and is fixed at the center of the top wall of the upper mold.

[0013] As a preferred solution of the low-pressure casting forming device for alloy components described in the present invention, vertical guide grooves are symmetrically opened on both sides of the bracket, a vertical guide column is fixedly arranged between the upper and lower walls on the inner side of each guide groove, and horizontal guide plates are symmetrically fixedly arranged on both sides of the upper mold, and the two guide plates are vertically slidably penetrated by two guide columns respectively through linear bearings.

[0014] As a preferred solution of the low-pressure casting forming device for alloy components described in the present invention, wherein: the top of the shell is located at the rear of the lower half mold, and inverted "L"-shaped fixing frames are symmetrically fixed on both sides, and a suspension bracket is fixedly arranged between the two fixing frames, and two vertical rotating shaft rods are rotatably penetrated through the upper and lower sides of the suspension bracket through bearings, one of which is longer, and the rod bodies of the two rotating shaft rods are respectively fixed with mutually meshing linkage gears, and the rod bodies of the two rotating shaft rods are respectively fixedly connected to the rear sides of the two lower half molds through connecting plates; the two lower half molds are spaced apart from the top of the shell, and a first auxiliary wheel is fixedly arranged at the bottom of each lower half mold, and the roller of the first auxiliary wheel is in contact with the top of the shell.

[0015] As a preferred solution of the low-pressure casting forming device for alloy components described in the present invention, the transmission mechanism includes a vertical transmission rack fixed to the rear side of the upper mold, a horizontal transmission rod is rotatably arranged between the two fixed frames through a bearing, a transmission gear meshing with the transmission rack and a first bevel gear are fixedly arranged on the rod body of the transmission rod, and a second bevel gear meshing with the first bevel gear is fixedly arranged on the upper end of the longer rotating shaft rod.

[0016] As a preferred embodiment of the low-pressure casting forming device for an alloy component described in the present invention, the following is provided: on one side of the two lower molds close to the fixed ring, a semi-circular groove adapted to half of the fixed ring is recessed and opened. A sealing layer is embedded in the lower edge of the upper mold, the upper edges and side edges of the two lower molds, the inner side of the semi-circular groove, and the outer edge of the fixed ring. After the upper mold and the two lower molds are closed, the adjacent sealing layers are pressed against each other tightly.

[0017] As a preferred embodiment of the low-pressure casting forming device for an alloy component described in the present invention, the following is provided: the linkage ejection mechanism includes a first variable-speed gear fixed to the bottom end of a longer rotating shaft rod. A vertical first linkage rod is rotatably arranged through a bearing at the top of the housing near the first variable-speed gear. A second variable-speed gear and a third variable-speed gear are fixedly arranged on the rod body of the first linkage rod. The outer diameter of the second variable-speed gear is smaller than that of the first variable-speed gear and meshes with the first variable-speed gear. The outer diameter of the third variable-speed gear is larger than that of the second variable-speed gear. A vertical second linkage rod is rotatably arranged through a bearing at the top of the housing near the third variable-speed gear. A fourth variable-speed gear and a first bevel gear are fixedly arranged on the rod body of the second linkage rod. The outer diameter of the fourth variable-speed gear is smaller than that of the third variable-speed gear and meshes with the third variable-speed gear;

[0018] Two side plates are fixedly arranged at the top of the housing behind the fixed ring. A lead screw is rotatably arranged through a bearing on the side wall of the side plate, and a guide rod parallel to the lead screw is fixedly arranged. A second bevel gear meshing with the first bevel gear is fixedly arranged at the rear end of the lead screw. A movable frame is screwed on the rod body of the lead screw. The rod body of the guide rod slidably penetrates through the movable frame, and the rotating lead screw drives the movable frame to move in the front-rear direction.

[0019] As a preferred embodiment of the low-pressure casting forming device for an alloy component described in the present invention, the following is provided: a chute is opened at the top of the movable frame. A slider is slidably arranged in the chute, and the slider moves in the same direction as the movable frame. A fixed block is fixedly arranged at the rear of the top of the movable frame. A sliding rod is fixedly arranged at the rear side of the slider. The rod body of the sliding rod slidably penetrates through the rear side of the fixed block, and a limiting ring is fixedly protruded at the rear end of the rod body of the sliding rod. A spring parallel to the sliding rod is fixedly arranged between the fixed block and the slider. The rod body of the sliding rod passes through the inside of the spring with a clearance;

[0020] At the top of the housing, mounting brackets are arranged at intervals on both sides of the movable frame. At the upper ends of the two mounting brackets, a rotating rod is rotatably arranged through a torsion spring. A pressing plate is fixedly arranged on the rod body of the rotating rod. Under the action of the torsion spring, the pressing plate presses upward against the slider. A limiting block is fixedly protruded at the bottom of the pressing plate. A limiting frame for limiting the limiting block is fixedly protruded at the top of the slider. A first inclined sliding surface is arranged at the rear end of the pressing plate. A second inclined sliding surface for cooperating with the first inclined sliding surface is arranged at the front side of the top end of the fixed block. A second auxiliary wheel is fixedly arranged at the bottom of the movable frame. The roller of the second auxiliary wheel contacts the top of the housing.

[0021] As a preferred scheme of a low-pressure casting forming device for an alloy component according to the present invention, wherein: a lifting ring is vertically and slidably arranged outside the lifting pipe through a vertical linear bearing. The lifting ring is located between the housing and the lower half mold. Through holes are annularly formed on the fixed ring. Ejector rods corresponding to the through holes are annularly protruded at the top of the lifting ring. A circular sealing plate is protruded at the top end of each ejector rod. A sealing groove is formed at the inner top end of each through hole. Sealing layers are embedded on the outer side, bottom, inner side, and bottom of the sealing plate and the sealing groove. When the upper mold and the two lower half molds are closed to form a sealed cavity, the sealing layers on the sealing plate and the sealing groove are pressed against each other tightly, and the upper surface of the sealing plate is coplanar with the upper surface of the through hole. A connecting rod is hinged on the side wall of the lifting ring. The rear end of the connecting rod is hinged on the front side wall of the slider.

[0022] The beneficial effects of the present invention are as follows: Through the linkage of the transmission mechanism and the driving mechanism, when the upper mold rises, the lower half mold automatically rotates in the opposite direction through gear transmission, realizing the rapid opening of the sealed cavity, improving production efficiency. Then, through the linkage ejecting mechanism, the ejector rod is driven by the power of the mold opening and closing, converting the small rotation of the rotating shaft into the rapid vertical movement of the ejector rod, ensuring that the casting can be ejected after mold opening and reducing subsequent operations. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0024] Figure 1 is a structural schematic diagram of the present invention;

[0025] Figure 2 is a structural schematic diagram of the internal components of the housing of the present invention;

[0026] Figure 3Explosion diagram of components such as the upper mold and lower mold of the present invention;

[0027] Figure 4 Structural schematic diagram of the present invention in the rear top view direction;

[0028] Figure 5 For the present invention Figure 4 Structural schematic diagram of area A in;

[0029] Figure 6 Structural schematic diagram of components such as the linkage ejection mechanism of the present invention in the side view direction;

[0030] Figure 7 Structural schematic diagram of some components of the linkage ejection mechanism of the present invention in the side view direction;

[0031] Figure 8 For the present invention Figure 7 Structural schematic diagram of area B in;

[0032] Figure 9 For the present invention Figure 7 Structural schematic diagram in the side view direction;

[0033] Figure 10 Structural schematic diagram of the fixing ring of the present invention in the top view direction.

[0034] In the figure: housing 100, liquid rising pipe 101, fixing ring 102, crucible 103, air inlet pipe 104, air pump 105, connecting pipe 106, gas storage tank 107, control valve 108, feed pipe 109, casting mechanism 200, upper mold 201, lower mold 202, bracket 203, electric cylinder 204, guide groove 205, guide post 206, guide plate 207, fixing frame 208, suspension bracket 209, rotating shaft rod 210, linkage gear 211, connecting plate 212, first auxiliary wheel 213, semi-circular groove 214, transmission mechanism 300, transmission rack 301, transmission rod 302, transmission gear 303, first bevel gear 304, second bevel gear 305, linkage ejection mechanism 400, first speed change gear 401, first linkage rod 402, second speed change gear 403, third speed change gear 404, second linkage rod 405, fourth speed change gear 406, first bevel gear 407, side plate 408, lead screw 409, guide rod 410, second bevel gear 411, movable frame 412, chute 413, slider 414, fixed block 415, slide bar 416, limit ring 417, spring 418, mounting frame 419, rotating rod 420, pressing plate 421, limit block 422, limit frame 423, first inclined sliding surface 424, second inclined sliding surface 425, lifting ring 426, through hole 427, sealing groove 4271, ejection rod 428, sealing plate 4281, connecting rod 429, second auxiliary wheel 430. Detailed implementation method

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0037] Secondly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail in conjunction with the accompanying drawings.

[0039] Please refer to Figures 1 - 10 , which shows a schematic structural diagram of an embodiment of a low-pressure casting forming device for an alloy component of the present invention. Please refer to Figures 1 - 10 , for a detailed introduction to a low-pressure casting forming device for an alloy component.

[0040] Embodiment 1: A low-pressure casting forming device for an alloy component, comprising a housing 100, a casting mold mechanism 200, a transmission mechanism 300, and a linkage ejection mechanism 400:

[0041] A vertical lifting pipe 101 is disposed through the center of the top of the housing 100. The lifting pipe 101 conveys liquid metal through a low-pressure conveying mechanism. A fixing ring 102 is fixedly disposed on the outer side of the upper end of the lifting pipe 101;

[0042] The mold casting mechanism 200 is arranged above the housing 100 and is connected to the liquid-lifting pipe 101 for casting liquid metal into components. It includes an upper mold 201 that is lifted and lowered above the housing 100 through a driving mechanism, and two lower half-molds 202 that are symmetrically rotatably arranged below the upper mold 201. After the upper mold 201 and the two lower half-molds 202 are closed, a sealed cavity for casting components is formed. The fixed ring 102 is located within the sealed cavity and its upper surface is coplanar with the lower surface of the sealed cavity; on one side of the two lower half-molds 202 close to the fixed ring 102, a semi-circular groove 214 that fits half of the fixed ring 102 is recessed. A sealing layer is embedded in the lower edge of the upper mold 201, the upper edges and side edges of the two lower half-molds 202, the inner side of the semi-circular groove 214, and the outer edge of the fixed ring 102. After the upper mold 201 and the two lower half-molds 202 are closed, the adjacent sealing layers are pressed against each other tightly. Through the embedded sealing layer, after the upper mold 201 and the two lower half-molds 202 are closed, the sealed cavity is in a sealed state;

[0043] The transmission mechanism 300 is arranged behind the mold casting mechanism 200 and is used to control the two lower half-molds 202 to rotate in opposite directions while the upper mold 201 rises after the component casting is completed, opening the sealed cavity;

[0044] The linkage ejection mechanism 400 is arranged between the housing 100 and the lower half-mold 202 and is used to eject the cast component after the sealed cavity is opened.

[0045] Embodiment 2: On the basis of Embodiment 1, the low-pressure conveying mechanism includes a crucible 103 fixed in the inner cavity of the housing 100. The lower end of the liquid-lifting pipe 101 is connected to the inner cavity of the crucible 103. An air inlet pipe 104 for injecting gas is fixedly arranged on one side of the housing 100 and is connected to the inner cavity of the crucible 103. The other end of the air inlet pipe 104 is connected to the air supply end of an air pump 105. The air inlet end of the air pump 105 is connected to a connecting pipe 106. The other end of the connecting pipe 106 is connected to the inner cavity of a gas storage tank 107. The gas storage tank 107 stores dry compressed gas. A control valve 108 is arranged on the connecting pipe 106; on the other side of the housing 100, a feeding pipe 109 for injecting liquid metal into the inner cavity of the crucible 103 is arranged;

[0046] After injecting the liquid metal into the interior of the crucible 103 through the feeding pipe 109, the feeding pipe 109 is then sealed. When casting a component, dry compressed gas is introduced into the sealed crucible 103. This gas can be an inert gas to improve the stability during gas supply. The liquid metal rises along the liquid-lifting pipe 101 under pressure, slowly filling the sealed cavity, maintaining the pressure until the casting is completely solidified, using pressure to compensate for shrinkage of the casting, reducing shrinkage cavities and porosity. After releasing the pressure, the mold is opened to take out the casting.

[0047] Embodiment 3: Based on Embodiment 1, the driving mechanism includes a bracket 203 in the shape of a Chinese character "冂" fixed to the top of the housing 100, a vertical electric cylinder 204 is fixedly provided on the top of the bracket 203, and an output rod of the electric cylinder 204 slides through the top of the bracket 203 and is fixed at the center of the top wall of the upper mold 201; when the height of the upper mold 201 is to be adjusted, thereby opening or closing the sealed cavity, the electric cylinder 204 is started to drive the upper mold 201 to rise and fall;

[0048] Vertical guide grooves 205 are symmetrically opened on both sides of the bracket 203, and a vertical guide column 206 is fixedly arranged between the upper and lower walls of the inner side of each guide groove 205. Horizontal guide plates 207 are symmetrically fixedly arranged on both sides of the upper mold 201, and the two guide plates 207 are vertically slidably penetrated by two guide columns 206 respectively through linear bearings; when the upper mold 201 is raised or lowered, the guide plates 207 will also be raised or lowered along the rods of the guide columns 206 through the linear bearings, so that the upper mold 201 is raised or lowered more stably;

[0049] Embodiment 4: On the basis of embodiment 1, the top of the shell 100 is located behind the lower half mold 202, and an inverted "L"-shaped fixing frame 208 is symmetrically fixed on both sides. A suspension bracket 209 is fixed between the two fixing frames 208. Two vertical rotating shafts 210 are rotatably penetrated through the upper and lower sides of the suspension bracket 209 through bearings, one of which is longer. The rod bodies of the two rotating shafts 210 are respectively fixed with mutually meshing linkage gears 211, and the rod bodies of the two rotating shafts 210 are respectively fixedly connected to the rear sides of the two lower half molds 202 through connecting plates 212; the two lower half molds 202 are spaced apart from the top of the shell 100, and a first auxiliary wheel 213 is fixedly provided at the bottom of each lower half mold 202, and the roller of the first auxiliary wheel 213 is in contact with the top of the shell 100;

[0050] When the longer rotating shaft rod 210 rotates, the other rotating shaft rod 210 can be driven to rotate in the opposite direction through the two linkage gears 211, thereby driving the two lower half molds 202 to rotate in opposite directions, and the lower half molds 202 can be supported by the first auxiliary wheel 213 without hindering the movement of the lower half molds 202;

[0051] The transmission mechanism 300 includes a vertical transmission rack 301 fixed to the rear side of the upper mold 201. A horizontal transmission rod 302 is rotatably arranged between the two fixing frames 208 through bearings. A transmission gear 303 meshing with the transmission rack 301 and a first bevel gear 304 are fixedly arranged on the rod body of the transmission rod 302. A second bevel gear 305 meshing with the first bevel gear 304 is arranged at the upper end of the longer rotating shaft rod 210. When the upper mold 201 gradually rises, the transmission rack 301 drives the transmission gear 303, the transmission rod 302, and the first bevel gear 304 to rotate. Then, the second bevel gear 305 drives the longer rotating shaft rod 210 to rotate, so that the two lower half molds 202 gradually rotate in opposite directions to open the sealing cavity.

[0052] When the upper mold 201 gradually descends, the transmission rack 301 drives the transmission gear 303, the transmission rod 302, and the first bevel gear 304 to rotate in the reverse direction. Then, the second bevel gear 305 drives the longer rotating shaft rod 210 to rotate in the reverse direction, so that the two lower half molds 202 gradually rotate in opposite directions until they are closed to form a sealing cavity.

[0053] Embodiment 5: On the basis of Embodiment 4, the linkage ejection mechanism 400 includes a first variable-speed gear 401 fixed to the bottom end of the longer rotating shaft rod 210. A vertical first linkage rod 402 is rotatably arranged at the top of the housing 100 near the first variable-speed gear 401 through a bearing. A second variable-speed gear 403 and a third variable-speed gear 404 are fixedly arranged on the rod body of the first linkage rod 402. The outer diameter of the second variable-speed gear 403 is smaller than that of the first variable-speed gear 401 and meshes with the first variable-speed gear 401. The outer diameter of the third variable-speed gear 404 is larger than that of the second variable-speed gear 403. A vertical second linkage rod 405 is rotatably arranged at the top of the housing 100 near the third variable-speed gear 404 through a bearing. A fourth variable-speed gear 406 and a first bevel gear 407 are fixedly arranged on the rod body of the second linkage rod 405. The outer diameter of the fourth variable-speed gear 406 is smaller than that of the third variable-speed gear 404 and meshes with the third variable-speed gear 404. Since the rotation amplitude of the rotating shaft rod 210 is small whether the lower half mold 202 is opened or closed, the first variable-speed gear 401 and the second variable-speed gear 403 can drive the first linkage rod 402 to rotate for a large number of turns, and then the third variable-speed gear 404 and the fourth variable-speed gear 406 drive the second linkage rod 405 to rotate for more turns.

[0054] At the rear of the fixed ring 102, two side plates 408 are fixedly arranged at the top of the housing 100. On the side wall of the side plate 408, a lead screw 409 is rotatably arranged through a bearing, and a guide rod 410 parallel to the lead screw 409 is fixedly arranged. At the rear end of the lead screw 409, a second bevel gear 411 meshing with the first bevel gear 407 is fixedly arranged. A movable frame 412 is screwed on the rod body of the lead screw 409, and the rod body of the guide rod 410 slidably penetrates through the movable frame 412. The rotating lead screw 409 drives the movable frame 412 to move in the front-rear direction; when the second linkage rod 405 obtains a relatively large number of rotation turns, the lead screw 409 is driven to rotate a relatively large number of turns through the first bevel gear 407 and the second bevel gear 411, so that the movable frame 412 moves back and forth. It should be noted that when the upper mold 201 and the two lower molds 202 gradually move away and open, the movable frame 412 gradually moves forward at this time; on the contrary, when the upper mold 201 and the two lower molds 202 gradually close, the movable frame 412 gradually moves backward at this time. The forward movement of the movable frame 412 means that the movable frame 412 gradually approaches the position where the fixed ring 102 is located, and on the contrary, the backward movement of the movable frame 412 means that the movable frame 412 gradually moves away from the position where the fixed ring 102 is located;

[0055] A chute 413 is formed at the top of the movable frame 412. A slider 414 is slidably arranged in the chute 413. The slider 414 is in the same sliding direction as the movable frame 412. A fixed block 415 is fixedly arranged at the rear of the top of the movable frame 412. A slide rod 416 is fixedly arranged at the rear side of the slider 414. The rod body of the slide rod 416 slidably penetrates through the rear side of the fixed block 415, and a limit ring 417 is fixedly protruded at the rear end of the rod body of the slide rod 416. A spring 418 parallel to the slide rod 416 is fixedly arranged between the fixed block 415 and the slider 414. The rod body of the slide rod 416 passes through the inner side of the spring 418 with a gap; the limit ring 417 is arranged to prevent the slide rod 416 from being completely separated from the fixed block 415;

[0056] On the top of the housing 100, mounting brackets 419 are arranged at intervals on both sides of the movable frame 412. The upper ends of the two mounting brackets 419 are rotatably provided with a rotating rod 420 through a torsion spring. A pressing plate 421 is fixedly arranged on the rod body of the rotating rod 420. Under the action of the torsion spring, the pressing plate 421 presses upward above the slider 414. A limiting block 422 is fixedly protruded at the bottom of the pressing plate 421. A limiting frame 423 for limiting the limiting block 422 is fixedly protruded at the top of the slider 414. A first inclined sliding surface 424 is arranged at the rear end of the pressing plate 421. A second inclined sliding surface 425 for cooperating with the first inclined sliding surface 424 is arranged at the front side of the top end of the fixed block 415. A second auxiliary wheel 430 is fixedly arranged at the bottom of the movable frame 412. The roller of the second auxiliary wheel 430 contacts the top of the housing 100. By providing the second auxiliary wheel 430, the movable frame 412 can be supported to a certain extent and the forward and backward movement of the movable frame 412 will not be hindered.

[0057] It should be noted and explained that when the upper die 201 and the two lower dies 202 are closed, the distance between the movable frame 412 and the fixed ring 102 is at the maximum at this time. Under the push of the spring 418, the front side wall of the limiting frame 423 is in a fitting state with the rear side wall of the limiting block 422.

[0058] When the upper die 201 and the two lower dies 202 are gradually opened, the movable frame 412 gradually approaches the fixed ring 102 forward at this time. Since the front side wall of the limiting frame 423 is in a fitting state with the rear side wall of the limiting block 422, the slider 414 remains stationary relative to the movable frame 412. At this time, the fixed block 415 gradually approaches the slider 414 and the first inclined sliding surface 424, and the spring 418 is gradually compressed and stores energy.

[0059] When the movable frame 412 completely moves forward, that is, after the upper die 201 and the two lower dies 202 are completely opened, the second inclined sliding surface 425 first touches and abuts against the first inclined sliding surface 424 at this time, so that the pressing plate 421 is lifted and the limiting block 422 is separated from the limiting frame 423. At this time, the slider 414 and the spring 418 are no longer hindered, and the energy-stored spring 418 quickly pushes the slider 414 to move forward.

[0060] A lifting ring 426 is vertically and slidably arranged outside the lifting pipe 101 through a vertical linear bearing. The lifting ring 426 is located between the housing 100 and the lower half die 202. Through holes 427 are formed in a surrounding manner on the fixing ring 102. Ejector rods 428 corresponding to the through holes 427 are protruded in a surrounding manner at the top of the lifting ring 426. A circular sealing plate 4281 is protruded at the top end of each ejector rod 428. A sealing groove 4271 is formed at the inner top end of each through hole 427. Sealing layers are embedded on the outer side and bottom of the sealing plate 4281 and the inner side and bottom of the sealing groove 4271 to prevent the leakage of liquid metal through the sealing layers of the sealing plate 4281 and the sealing groove 4271. When the upper die 201 and the two lower half dies 202 are closed to form a sealed cavity, the sealing layers on the sealing plate 4281 and the sealing groove 4271 are pressed against each other tightly, and the upper surface of the sealing plate 4281 is coplanar with the upper surface of the through hole 427. A connecting rod 429 is hinged on the side wall of the lifting ring 426. The rear end of the connecting rod 429 is hinged on the front side wall of the slider 414. When the slider 414 is quickly pushed forward, the lifting ring 426 is driven to quickly rise along the outside of the lifting pipe 101 through the connecting rod 429. At this time, the ejector rods 428 quickly rise, so as to eject the cast component out of the top of the fixing ring 102.

[0061] Although the present invention has been described with reference to the embodiments above, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments of the present invention can be combined with each other in any way. The exhaustive description of these combinations is omitted in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A low-pressure casting forming device for alloy components, comprising a housing (100), a casting mold mechanism (200), a transmission mechanism (300) and a linkage ejection mechanism (400), characterized in that: A vertical lifting pipe (101) is disposed through the center of the top of the housing (100). The lifting pipe (101) conveys liquid metal through a low-pressure conveying mechanism. A fixing ring (102) is fixedly disposed on the outer side of the upper end of the lifting pipe (101); The casting mold mechanism (200) is disposed above the housing (100) and is communicated with the lifting pipe (101) for casting liquid metal into components. It includes an upper mold (201) that is lifted and lowered above the housing (100) through a driving mechanism, and two lower half molds (202) that are symmetrically rotatably disposed below the upper mold (201). After the upper mold (201) and the two lower half molds (202) are closed, a sealed cavity for casting components is formed. The fixing ring (102) is located in the sealed cavity and its upper surface is coplanar with the lower surface of the sealed cavity; The transmission mechanism (300) is disposed behind the casting mold mechanism (200) and is used to control the two lower half molds (202) to rotate in opposite directions to open the sealed cavity while the upper mold (201) rises after the component casting is completed; The linkage ejection mechanism (400) is disposed between the housing (100) and the lower half mold (202) and is used to eject the cast component after the sealed cavity is opened.

2. The low-pressure casting forming device for alloy components according to claim 1, characterized in that: The low-pressure conveying mechanism includes a crucible (103) fixed in the inner cavity of the housing (100). The lower end of the lifting pipe (101) is communicated with the inner cavity of the crucible (103). An air inlet pipe (104) for injecting gas is fixedly disposed on one side of the housing (100) and is communicated with the inner cavity of the crucible (103). The other end of the air inlet pipe (104) is connected to the air supply end of an air pump (105). The air inlet end of the air pump (105) is connected with a connecting pipe (106). The other end of the connecting pipe (106) is connected to the inner cavity of a gas storage tank (107). Dry compressed gas is stored inside the gas storage tank (107). A control valve (108) is disposed on the connecting pipe (106); A feed pipe (109) for inputting liquid metal is disposed on the other side of the housing (100) and is communicated with the inner cavity of the crucible (103).

3. The low-pressure casting forming device for alloy components according to claim 1, characterized in that: The driving mechanism includes a "冂"-shaped bracket (203) fixed on the top of the housing (100). A vertical electric cylinder (204) is fixedly disposed on the top of the bracket (203). The output rod of the electric cylinder (204) slidably penetrates through the top of the bracket (203) and is fixed at the center of the top wall of the upper mold (201).

4. The low-pressure casting forming device for alloy components according to claim 3, characterized in that: Vertical guide grooves (205) are symmetrically opened on both sides of the bracket (203). Vertical guide posts (206) are fixedly disposed between the upper and lower walls of the inner side of each guide groove (205). Horizontal guide plates (207) are symmetrically fixedly disposed on both sides of the upper mold (201). The two guide plates (207) are vertically slidably penetrated by two guide posts (206) respectively through linear bearings.

5. The low-pressure casting forming device for alloy components according to claim 1, characterized in that: The top of the shell (100) is located behind the lower half mold (202), and two inverted "L"-shaped fixing frames (208) are symmetrically fixedly arranged on both sides; a suspension bracket (209) is fixedly arranged between the two fixing frames (208); two vertical rotating shafts (210) are rotatably arranged through the upper and lower sides of the suspension bracket (209) through bearings, one of the rotating shafts (210) is longer, and mutually meshing linkage gears (211) are fixedly arranged on the rod bodies of the two rotating shafts (210), and the rod bodies of the two rotating shafts (210) are respectively fixedly connected to the rear sides of the two lower half molds (202) through connecting plates (212); the two lower half molds (202) are spaced apart from the top of the shell (100), and a first auxiliary wheel (213) is fixedly arranged at the bottom of each lower half mold (202), and the roller of the first auxiliary wheel (213) contacts the top of the shell (100).

6. The low-pressure casting forming device for alloy components according to claim 5, characterized in that: The transmission mechanism (300) comprises a vertical transmission rack (301) fixed to the rear side of the upper mold (201), a horizontal transmission rod (302) rotatably arranged between the two fixed frames (208) via a bearing, a transmission gear (303) meshing with the transmission rack (301) and a first bevel gear (304) fixedly arranged on the rod body of the transmission rod (302), and a second bevel gear (305) meshing with the first bevel gear (304) being arranged at the upper end of the longer rotating shaft rod (210).

7. The low-pressure casting forming device for alloy components according to claim 1, characterized in that: A semicircular groove (214) adapted to half of the fixing ring (102) is formed in an inwardly recessed manner on one side of the two lower half molds (202) close to the fixing ring (102); the lower edge of the upper mold (201), the upper edges and side edges of the two lower half molds (202), the inner sides of the semicircular grooves (214) and the outer edges of the fixing ring (102) are all embedded with sealing layers; after the upper mold (201) and the two lower half molds (202) are closed, adjacent sealing layers are pressed tightly against each other.

8. The low-pressure casting forming device for alloy components according to claim 5, characterized in that: The linkage ejection mechanism (400) comprises a first speed gear (401) fixed at the bottom end of a relatively long rotating shaft rod (210); a vertical first linkage rod (402) is rotatably arranged at the top of the housing (100) near the first speed gear (401) via a bearing; a second speed gear (403) and a third speed gear (404) are fixedly arranged on the rod body of the first linkage rod (402); the outer diameter of the second speed gear (403) is smaller than the outer diameter of the first speed gear (401) and is aligned with the outer diameter of the first speed gear (404). 401), the outer diameter of the third speed gear (404) is larger than the outer diameter of the second speed gear (403), a vertical second linkage rod (405) is rotatably provided at the top of the housing (100) near the third speed gear (404) through a bearing, a fourth speed gear (406) and a first bevel gear (407) are fixedly provided on the rod body of the second linkage rod (405), the outer diameter of the fourth speed gear (406) is smaller than the outer diameter of the third speed gear (404) and is meshed with the third speed gear (404); The top of the housing (100) is located behind the fixing ring (102) and is fixedly provided with two side plates (408); a screw rod (409) is rotatably provided on the side wall of the side plate (408) through a bearing, and a guide rod (410) is fixedly provided parallel to the screw rod (409); a second bevel gear (411) meshing with the first bevel gear (407) is fixedly provided at the rear end of the screw rod (409); a movable frame (412) is threadedly provided on the rod body of the screw rod (409); the rod body of the guide rod (410) slides through the movable frame (412); the rotating screw rod (409 drives the movable frame (412) to move in the front-rear direction.

9. The low-pressure casting forming device for alloy components according to claim 8, characterized in that: A slide groove (413) is provided on the top of the movable frame (412), a slider (414) is slidably arranged in the groove of the slide groove (413), and the slider (414) and the movable frame (412) slide in the same direction; a fixed block (415) is fixedly arranged at the rear of the top of the movable frame (412), a slide rod (416) is fixedly arranged on the rear side of the slide rod (414), the rod body of the slide rod (416) slides through the rear side of the fixed block (415), and a limit ring (417) is fixedly protruded at the rear end of the slide rod (416), a spring (418) parallel to the slide rod (416) is fixedly arranged between the fixed block (415) and the slide rod (414), and the rod body of the slide rod (416) passes through the inner side of the spring (418); The top of the housing (100) is provided with mounting frames (419) at intervals on both sides of the movable frame (412); the upper ends of the two mounting frames (419) are provided with rotating rods (420) through torsion springs; a pressure plate (421) is fixedly provided on the rod body of the rotating rod (420); the pressure plate (421) applies pressure toward the top of the slider (414) under the action of the torsion spring; a limit block (422) is fixedly provided on the bottom of the pressure plate (421); and the slider (414) is provided with a fixed protrusion. 4) is fixedly protruded at the top and is provided with a limit frame (423) for limiting the limit block (422), a first inclined sliding surface (424) is provided at the rear end of the pressure plate (421), a second inclined sliding surface (425) matching the first inclined sliding surface (424) is provided at the front side of the top end of the fixed block (415), and a second auxiliary wheel (430) is fixedly provided at the bottom of the movable frame (412), and a roller of the second auxiliary wheel (430) is in contact with the top of the shell (100).

10. The low-pressure casting forming device for alloy components according to claim 9, characterized in that: A lifting ring (426) is vertically slidably provided on the outer side of the lifting tube (101) via a vertical linear bearing. The lifting ring (426) is located between the shell (100) and the lower half mold (202). A through hole (427) is circumferentially provided on the fixing ring (102). An ejector rod (428) corresponding to the through hole (427) is circumferentially provided on the top of the lifting ring (426). A circular sealing plate (4281) is protruded from the top end of each ejector rod (428). A sealing groove (4271) is provided at the top end of each through hole (427). The outer side and bottom of the sealing plate (4281) and the inner side and bottom of the sealing groove (4271) are both embedded with sealing layers. When the upper mold (201) and the two lower half molds (202) are closed to form a sealed cavity, the sealing layers on the sealing plate (4281) and the sealing groove (4271) are pressed tightly against each other, and the upper surface of the sealing plate (4281) is coplanar with the upper surface of the through hole (427). The side wall of the lifting ring (426) is hingedly provided with a connecting rod (429), and the rear end of the connecting rod (429) is hingedly connected to the front side wall of the slider (414).

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