Low-pressure casting device for aluminum alloy parts

Abstract

The invention discloses a low-pressure casting device for aluminum alloy parts, and relates to the technical field of low-pressure casting. A first electric conveying belt is mounted at the top of a box body, and a second electric conveying belt and a third electric conveying belt which are in butt joint with the first electric conveying belt are mounted on the two symmetrical sides outside a main machine table correspondingly; by means of conveying of a second electric conveying belt, a first electric conveying belt and a third electric conveying belt, a mold can be flexibly transferred, the time needed for cooling and shaping of melt is integrated into the conveying and replacing process of the mold, the production efficiency is improved, meanwhile, through cooperation of a first hydraulic push rod and a second hydraulic push rod, vertical force application is conducted at the same time, and the production efficiency is improved. And in addition, the box body is controlled to ascend and descend through the second hydraulic push rod, so that the aluminum alloy melt stored in the heat preservation cylinder is oscillated and mixed, and the problems of element segregation and impurity segregation caused by long-time standing of the aluminum alloy melt can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure casting, and in particular to a low-pressure casting device for aluminum alloy parts. Background Art

[0002] Low-pressure casting is a casting method in which liquid alloy is pressed into a mold cavity from bottom to top under pressure, and a casting is obtained after cooling and solidification. It is widely used in the production of aluminum alloy parts such as medical oral CT support frames.

[0003] During the operation of traditional low-pressure casting devices, the mold and the casting machine are usually fixedly connected. Although this fixed connection mode can ensure the stability of the casting process to a certain extent, it also means that the injection of the aluminum alloy melt and the subsequent cooling and shaping operations must be completed step by step on the casting machine. When the aluminum alloy melt is injected, it is necessary to wait for the melt to fill the mold cavity. This process itself takes a certain amount of time. After the melt is injected, it is necessary to stay on the machine for a long time until the aluminum alloy melt is cooled and solidified to the extent that it can be demolded. As a result, during the entire casting process, the casting machine is occupied by the mold, and it is impossible to prepare other molds or other parallel casting operations at the same time, which greatly wastes precious production time and leads to low production efficiency.

[0004] Therefore, a low-pressure casting device for aluminum alloy parts is proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in the low-pressure casting process of aluminum alloy parts in the prior art, due to the fixed connection between the mold and the machine, the operations such as injection of the molten metal, cooling and shaping need to be completed in sequence on the machine and cannot be completed in parallel, thus affecting the production efficiency, and a low-pressure casting device for aluminum alloy parts is proposed.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions: A low-pressure casting device for aluminum alloy parts comprises a main machine, a box body is installed in the middle position of the main machine, and a first chamber is opened at the lower position inside the box body, a heat preservation cylinder is fixedly installed in the first chamber, and a vertically arranged first vertical pipe is fixedly connected in the heat preservation cylinder, and the bottom of the first vertical pipe is communicated with the inside of the heat preservation cylinder, a second chamber is opened at the upper position inside the box body, a lifting platform is slidably installed in the middle position of the top of the box body, and a vertically arranged second vertical pipe is fixedly installed in the middle position of the lifting platform, the lower end of the second vertical pipe is slidably inserted in the first vertical pipe, the interiors of the first chamber and the second chamber are both communicated with an air supply mechanism, a first frame erected above the main machine is fixedly installed on the outside of the main machine, and a first frame is fixedly installed on the top of the first frame A first hydraulic push rod is arranged vertically, a first pressing plate fixedly connected to the telescopic end of the first hydraulic push rod is horizontally installed on the inner side of the first frame, second hydraulic push rods arranged vertically are fixedly installed at the four corners of the box body, and the telescopic end of the second hydraulic push rod is fixedly connected to the box body, first electric conveyor belts arranged side by side are fixedly installed on both sides of the top of the box body, a first base is installed on one side of the main machine, and second electric conveyor belts docked with the first electric conveyor belt are fixedly installed on both sides of the top of the first base, a second base is installed on the other side of the main machine, and third electric conveyor belts docked with the first electric conveyor belt are fixedly installed on both sides of the top of the second base, and molds are placed on the first electric conveyor belt, the second electric conveyor belt and the third electric conveyor belt.

[0007] Preferably, the mold includes a first mold body located at the bottom, and the second mold body is covered on the first mold body, a cavity is provided on the contact surface between the first mold body and the second mold body, a docking port adapted to the outer size of the upper end of the second vertical tube is provided at the bottom of the first mold body, a flow channel connecting the lowest point of the bottom of the cavity and the docking port is provided in the first mold body, and a sealing mechanism is provided between the docking port and the flow channel.

[0008] Preferably, the bottom of the first mold body is configured as a square structure, and the docking port is opened at the center position of the bottom of the first mold body.

[0009] Preferably, the sealing mechanism includes a valve plate slidably inserted in the connecting position of the docking port and the flow channel, a first spring for elastically supporting the valve plate is installed in the first mold body, the valve plate is sealed between the docking port and the flow channel under the elastic support of the first spring, a first rack is arranged on the valve plate, a first gear meshing with the first rack is rotatably installed in the first mold body, a second gear coaxially arranged therewith is fixedly installed on the first gear, a second rack meshing with the second gear is vertically slidable in the first mold body, and a ring cylinder is fixedly installed on the top of the lifting platform.

[0010] Preferably, the bottom of the first mold body is provided with an annular groove coaxially sleeved on the outside of the docking port, and an annular plate fixedly connected to the lower end of the second rack is slidably installed in the annular groove, and the annular cylinder is adapted to the annular plate.

[0011] Preferably, the interior of the first mold body is provided with evenly distributed channels, and two through-holes symmetrically arranged along the central axis are provided at diagonal positions at the bottom of the first mold body, and the two through-holes are respectively connected to the two ends of the channels, and a switching mechanism is installed on the top of the first base and the second base, and the switching mechanism includes two outer frames arranged side by side, and rollers are rotatably installed inside the two ends of the outer frames, and the outer sides of the two rollers are jointly sleeved with an annular belt slidably connected to the outer frames, and the outer frames cooperate with the annular belt to form a closed chamber, and the annular belt is provided with evenly distributed through-holes, and the through-holes and the through-holes are correspondingly arranged, and valve members connected to the through-holes are installed on the inner side of the annular belt, and grooves for smooth movement of the through-holes are provided around the rollers, and the two outer frames located on the first base, one is connected to the air outlet of the external hot air flow supply mechanism, and the other is connected to the air return port of the external hot air flow supply mechanism, and the two outer frames located on the second base, one is connected to the air outlet of the external cold air flow supply mechanism, and the other is connected to the air return port of the external cold air flow.

[0012] Preferably, a third chamber located between the first chamber and the second chamber is opened in the box, and the interior of the third chamber and the interior of the hot air flow supply mechanism form an air flow circulation loop.

[0013] Preferably, the valve member includes an L-shaped tube fixedly connected to the through hole, and one end of the L-shaped tube away from the through hole is fixedly connected to a receiving tube perpendicular to the inner end wall of the annulus, a valve block is slidably inserted in the receiving tube, and a second spring installed in the receiving tube is fixedly connected to the side of the valve block close to the inner end wall of the annulus, the valve block is inserted into the L-shaped tube under the elastic support of the second spring, and the end of the L-shaped tube is sealed, and a magnet is fixedly embedded on the side of the valve block close to the inner end wall of the annulus.

[0014] Preferably, a second frame is fixedly installed on the outer side of one end of the second base close to the main platform, and a plurality of vertically arranged third hydraulic push rods are fixedly installed on the second frame, and a second pressure plate fixed together with the telescopic ends of the plurality of third hydraulic push rods is horizontally installed on the inner side of the second frame.

[0015] Preferably, a plurality of evenly distributed first rollers are rotatably mounted on the bottom of the first pressing plate, and a plurality of evenly distributed second rollers are rotatably mounted on the bottom of the second pressing plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by installing the first electric conveyor belt on the top of the box body, and installing the second electric conveyor belt and the third electric conveyor belt connected to the first electric conveyor belt on the two symmetrical sides outside the main machine, the mold can be flexibly transferred by means of the conveying of the second electric conveyor belt, the first electric conveyor belt and the third electric conveyor belt, so that the mold only needs to stay on the first electric conveyor belt for a short time to inject the aluminum alloy melt, and then transfer it outward, and the time required for the melt to cool and shape is integrated into the conveying and replacement process of the mold, and the aluminum alloy melt is continuously injected into different molds, which is conducive to improving production efficiency. At the same time, through the cooperation of the first hydraulic push rod and the second hydraulic push rod, the extrusion force is applied from the upper and lower sides at the same time, so that the force is uniform during the mold closing casting process, and the box body is controlled to rise and fall by the second hydraulic push rod, so that the aluminum alloy melt stored in the insulation cylinder is oscillated and mixed, so as to avoid the problem of element segregation and impurity aggregation caused by the aluminum alloy melt being left still for a long time, which is conducive to improving the quality of low-pressure casting of aluminum alloy parts; 2. In the present invention, by installing the blocking mechanism between the docking port and the flow channel, under normal conditions, with the help of the elastic support of the first spring, the valve plate is slidably inserted between the docking port and the flow channel to block the bottom of the flow channel. When the lifting platform drives the second vertical pipe to move upward and insert it into the docking port, it will drive the ring tube to move upward synchronously, push the second rack upward, and drive the valve plate to overcome the elastic support of the first spring and move under the meshing of the gear teeth to release the blockage of the bottom of the flow channel. Through the setting of the blocking mechanism, the docking port and the flow channel can be connected when the molten metal is injected, so that the bottom of the flow channel is automatically blocked after the molten metal is injected, thereby avoiding the leakage of the aluminum alloy molten metal that has not been completely solidified injected into the flow channel, which is conducive to ensuring the stability of the mold when the aluminum alloy molten metal is injected and the mold is removed in time; 3. In the present invention, two through ports connected to both ends of the channel are provided at the bottom of the first mold body, and a switching mechanism arranged side by side with the second electric conveyor belt and the third electric conveyor belt is installed on the first base and the second base. By means of the synchronous rotation of the endless belt and the conveyor belts in the corresponding first base and the second base, the through ports and the corresponding through holes are kept in a state of continuous alignment and connection during the movement of the mold, so that the preheating and cooling operations of the mold are realized by airflow during the conveying process, which is conducive to further improving the production efficiency; 4. In the present invention, by installing the second frame on the outer side of the second base close to one end of the main machine, vertically fixing the third hydraulic push rod on the top of the second frame, and fixing the second pressure plate on the telescopic end of the third hydraulic push rod, the mold can be pressed by the second pressure plate when it is transferred from the first electric conveyor belt to the third electric conveyor belt, which is beneficial to prolonging the internal pressure holding time of the mold during the removal process. At the same time, by rotatably installing the rotatable first roller and the second roller on the bottom of the first pressure plate and the second pressure plate respectively, the friction resistance between the top of the mold and the first pressure plate and the second pressure plate can be reduced, which is beneficial to ensure the smoothness of the mold in the pressurized state when it is transferred from the first electric conveyor belt to the third electric conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A perspective view of the present invention; Figure 2 A three-dimensional diagram of the mainframe and the first frame of the present invention; Figure 3 is a three-dimensional diagram of the second electric conveyor belt and the switching mechanism of the present invention; Figure 4 The figure is a disassembled diagram of the mold of the present invention; Figure 5 is a three-dimensional diagram of the blocking mechanism of the present invention; Figure 6 is a three-dimensional diagram of the switching mechanism of the present invention; Figure 7 A top view of the present invention; Figure 8 For the present invention Figure 7 Sectional view at AA in the middle; Fig. 9 For the present invention Figure 7 Sectional view at the middle BB; Fig.10 For the present invention Figure 7 Sectional view at CC; Fig.11 For the present invention Figure 7 Sectional view at DD in the middle; Fig.12 For the present invention Fig.11 Enlarged view of point E in the middle.

[0018] Serial number in the picture: 1. Main machine; 101. Box; 102. First chamber; 103. Insulation cylinder; 104. First vertical pipe; 105. Second chamber; 106. Lifting platform; 107. Second vertical pipe; 108. Ring cylinder; 2. First frame; 201. First hydraulic push rod; 202. First pressing plate; 203. First roller; 204. Second hydraulic push rod; 3. First electric conveyor belt; 301. First base; 302. Second electric conveyor belt; 303. Second base; 304. Third electric conveyor belt; 4. Mold; 401. first mold body; 402. second mold body; 403. cavity; 404. docking port; 405. flow channel; 406. blocking mechanism; 4061. valve plate; 4062. first spring; 4063. first rack; 4064. first gear; 4065. second gear; 4066. second rack; 4067. annular groove; 4068. ring plate; 407. channel; 408. through port; 5. Transfer mechanism; 501. Outer frame; 502. Roller; 503. Ring belt; 504. Through hole; 505. Valve member; 5051. L-shaped tube; 5052. Storage tube; 5053. Valve block; 5054. Second spring; 5055. Magnet; 6. The third chamber; 7. Second frame; 701. Third hydraulic push rod; 702. Second pressing plate; 703. Second roller. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment: This embodiment provides a low-pressure casting device for aluminum alloy parts, see Figure 1 - Fig.12Specifically, it includes a mainframe 1, a box 101 is installed in the middle position of the mainframe 1, and a first chamber 102 is opened at the lower position inside the box 101, a heat preservation cylinder 103 is fixedly installed in the first chamber 102, and a vertically arranged first vertical pipe 104 is fixedly connected to the heat preservation cylinder 103, the bottom of the first vertical pipe 104 is communicated with the inside of the heat preservation cylinder 103, a second chamber 105 is opened at the upper position inside the box 101, a lifting platform 106 is slidably installed in the middle position of the top of the box 101, and a vertically arranged second vertical pipe 107 is fixedly installed in the middle position of the lifting platform 106, the lower end of the second vertical pipe 107 is slidably inserted in the first vertical pipe 104, the interiors of the first chamber 102 and the second chamber 105 are both communicated with the air supply mechanism, and a first frame 2 erected above it is fixedly installed on the outer side of the mainframe 1, and a vertically arranged first hydraulic push rod 201 is fixedly installed on the top of the first frame 2 A first pressing plate 202 fixedly connected to the telescopic end of the first hydraulic push rod 201 is horizontally installed on the inner side of the first frame 2, and a vertically arranged second hydraulic push rod 204 is fixedly installed at the four corners of the box body 101, and the telescopic end of the second hydraulic push rod 204 is fixedly connected to the box body 101, and first electric conveyor belts 3 arranged side by side are fixedly installed on both sides of the top of the box body 101, a first base 301 is installed on one side of the main platform 1, and second electric conveyor belts 302 connected to the first electric conveyor belt 3 are fixedly installed on both sides of the top of the first base 301, a second base 303 is installed on the other side of the main platform 1, and third electric conveyor belts 304 connected to the first electric conveyor belt 3 are fixedly installed on both sides of the top of the second base 303, and the third electric conveyor belt 304 is flush with the raised position of the first electric conveyor belt 3, and molds 4 are placed on the first electric conveyor belt 3, the second electric conveyor belt 302 and the third electric conveyor belt 304.

[0021] The mold 4 includes a first mold body 401 located at the bottom, and the first mold body 401 is covered with a second mold body 402, a cavity 403 is opened on the contact surface between the first mold body 401 and the second mold body 402, a docking port 404 adapted to the outer size of the upper end of the second vertical pipe 107 is opened at the bottom of the first mold body 401, a flow channel 405 connected between the lowest point of the bottom of the cavity 403 and the docking port 404 is opened in the first mold body 401, and a sealing mechanism 406 is arranged between the docking port 404 and the flow channel 405.

[0022] When the device is used, the staff uses the device to perform continuous low-pressure casting production on the medical oral CT support frame of aluminum alloy. The aluminum alloy melt is put into the insulation cylinder 103, and many molds 4 for casting the medical oral CT support frame are placed on the second electric conveyor belt 302 in an orderly manner. After the second electric conveyor belt 302 is powered on and started, the many molds 4 are transported one by one toward the main platform 1. In the initial state, the first electric conveyor belt 3 fixed on the top of the box body 101 is flush with the second electric conveyor belt 302. After the first electric conveyor belt 3 is powered on and started, it can also be used to transport the mold 4. Under the cooperation of the second electric conveyor belt 302 and the first electric conveyor belt 3, the mold 4 is stably transported to the first electric conveyor belt 3 and is on the lifting platform 10. 6, and then the staff controls the first hydraulic push rod 201 and the second hydraulic push rod 204 to start synchronously, the telescopic end of the first hydraulic push rod 201 moves downward, drives the first pressure plate 202 to move downward, and applies the extrusion force to the second mold body 402 from top to bottom, and the telescopic end of the second hydraulic push rod 204 moves upward, drives the box body 101 to drive the first electric conveyor belt 3 to move upward, and applies the extrusion force to the first mold body 401 from bottom to top, so that the mold closing extrusion pressure is applied to the upper and lower sides of the mold 4 at the same time, so that the mold 4 is evenly stressed and not easy to deform, which is beneficial to improving the mold closing sealing of the mold 4, and is beneficial to ensuring the uniformity of the flow of the aluminum alloy melt when it is injected, so as to ensure the dimensional accuracy of the casting production of the medical oral CT support frame.

[0023] After the extrusion and mold closing are completed, the staff starts the air supply mechanism, and first transports air into the second chamber 105 through the air supply mechanism. With the continuous filling of air flow, the lifting platform 106 is lifted up, so that the upper end of the second vertical pipe 107 is vertically inserted into the docking port 404 opened at the bottom of the first mold body 401, and the high pressure state in the second chamber 105 is maintained, so that the second vertical pipe 107 and the docking port 404 are stably docked, and then the staff injects air flow into the first chamber 102 through the air supply mechanism. With the continuous filling of air flow, the air flow acts on the aluminum alloy melt contained in the insulation cylinder 103 from the top. With the continuous filling of air flow, the aluminum alloy melt in the insulation cylinder 103 enters through the bottom of the first vertical pipe 104, and then is transported into the flow channel 405 under the connection of the second vertical pipe 107, and moves upward along the flow channel 405, slowly filling the cavity 403, completing the operation of injecting the aluminum alloy melt into the cavity 403 at low pressure.

[0024] After the aluminum alloy melt is injected, the staff first interrupts the airflow charging into the first chamber 102, and performs airflow suction operation in the first chamber 102, so that the aluminum alloy melt in the first vertical pipe 104 and the second vertical pipe 107 flows back into the insulation cylinder 103, and then interrupts the airflow charging into the second chamber 105, and performs airflow suction operation in the second chamber 105, so that the lifting platform 106 drives the second vertical pipe 107 to move downward and reset, and separates the second vertical pipe 107 from the docking port 404, and then the first electric conveyor belt 3 is powered on and started again, and synchronously, the third electric conveyor belt 304 is powered on and started. The first electric conveyor belt 3 and the third electric conveyor belt 304 cooperate to move out the mold 4 injected with the molten aluminum alloy. In the process of the mold 4 being moved out from the top of the lifting platform 106 and transported outward, the molten aluminum alloy is gradually cooled and solidified in the cavity 403, and a medical oral CT support frame is formed according to the internal structure of the cavity 403. By continuously circulating and transporting a large number of molds 4, the time used for cooling and forming the molten aluminum alloy in the cavity 403 is incorporated into the transportation process of the mold 4, thereby reducing the time that the mold 4 stays under the first pressure plate 202 during a single casting process, which can effectively improve the efficiency of low-pressure casting production.

[0025] After the mold 4 is transferred from the first electric conveyor belt 3 to the third electric conveyor belt 304, the first hydraulic push rod 201 controls the first pressure plate 202 to move upward and reset, and the second hydraulic push rod 204 controls the first electric conveyor belt 3 to move downward and reset, and the first electric conveyor belt 3 is realigned with the second electric conveyor belt 302, and is ready to inject the aluminum alloy melt into the next mold 4, and the low-pressure casting production of the medical oral CT support frame is carried out in an orderly cycle. In the production process, the second hydraulic push rod 204 controls the box body 101 to intermittently rise and fall, so that the aluminum alloy melt in the insulation cylinder 103 can be shaken. By shaking, the aluminum alloy melt in the insulation cylinder 103 can be shaken and mixed, so as to avoid the problem of element segregation and impurity aggregation caused by the aluminum alloy melt being left still for a long time, which is beneficial to improving the quality of low-pressure casting of aluminum alloy parts.

[0026] In the specific implementation process, Figure 4 and Figure 7As shown, the bottom of the first mold body 401 is set to a square structure, and the docking port 404 is opened at the center position of the bottom of the first mold body 401. When the device is used, the bottom of the first mold body 401 is set to a square structure so that the length and width of the first mold body 401 are equal. Similarly, the top of the second mold body 402 is set to a square structure that matches the bottom of the first mold body 401, and the length and width of the second mold body 402 are also equal. This allows the mold 4 to be placed on the second electric conveyor belt 302 and transported to the first electric conveyor belt 3 without deliberately adjusting the orientation of the mold 4, so that stable casting production can be carried out in the horizontal or vertical direction. To a certain extent, it reduces the difficulty for the staff to use the device to continuously enter the low-pressure casting of aluminum alloy parts, which is beneficial to improving production convenience and production efficiency. By opening the docking port 404 at the bottom center position of the first mold body 401, the docking port 404 can be accurately docked with the second vertical pipe 107 when the mold 4 is placed horizontally and vertically.

[0027] In the specific implementation process, Figure 2 , Figure 4 , Figure 5 and Figure 8 - Fig.10 As shown, the blocking mechanism 406 includes a valve plate 4061 slidably inserted in the connection position between the docking port 404 and the flow channel 405, a first spring 4062 for elastically supporting the valve plate 4061 is installed in the first mold body 401, and the valve plate 4061 is blocked between the docking port 404 and the flow channel 405 under the elastic support of the first spring 4062, a first rack 4063 is arranged on the valve plate 4061, and a first gear 4064 meshing with the first rack 4063 is rotatably installed in the first mold body 401, and A second gear 4065 coaxially arranged thereon is fixedly mounted on the first gear 4064, a second rack 4066 meshing with the second gear 4065 is vertically slidable in the first mold body 401, a ring cylinder 108 is fixedly mounted on the top of the lifting platform 106, an annular groove 4067 coaxially sleeved on the outer side of the docking port 404 is provided at the bottom of the first mold body 401, and an annular plate 4068 fixedly connected to the lower end of the second rack 4066 is slidably mounted in the annular groove 4067, and the annular cylinder 108 is adapted to the annular plate 4068.

[0028] When the device is used, when the lifting platform 106 moves up and drives the second vertical pipe 107 to be inserted into the docking port 404, the ring tube 108 will be driven to move up synchronously and inserted into the corresponding ring groove 4067 at the bottom of the mold 4. With the insertion of the ring tube 108, the ring plate 4068 is pushed to drive the second rack 4066 to move upward. With the meshing of the second rack 4066 and the second gear 4065, the second gear 4065 is driven to rotate. Since the second gear 4065 is synchronous with the first gear 4064, The shaft is fixed so that the first gear 4064 is driven to rotate, and then the valve plate 4061 is driven to move by means of the engagement of the first gear 4064 with the first rack 4063. The valve plate 4061 overcomes the elastic support of the first spring 4062 and moves in the direction away from the connection position between the docking port 404 and the flow channel 405, thereby releasing the blockage between the docking port 404 and the flow channel 405. In this state, the aluminum alloy melt transported in the second vertical pipe 107 can smoothly enter the flow channel 405 for low-pressure casting.

[0029] When the aluminum alloy melt is injected, the lifting platform 106 moves downward to drive the second vertical pipe 107 to separate from the docking port 404, which will drive the ring tube 108 to move downward synchronously. After losing the pushing force of the lower ring tube 108, the valve plate 4061 moves in the opposite direction and resets under the elastic reset of the first spring 4062, and is reinserted into the connection between the docking port 404 and the flow channel 405 to seal the bottom of the flow channel 405 to prevent the aluminum alloy melt injected into the flow channel 405 from leaking out. This is beneficial to ensuring the stability of the device when the mold 4 is removed in time after the aluminum alloy melt is injected.

[0030] By sliding the ring plate 4068 fixedly connected to the lower end of the second rack 4066 into the ring groove 4067 opened at the bottom of the first mold body 401, and coaxially sleeve the ring groove 4067 on the outer side of the docking port 404, and setting the ring cylinder 108 as a circular ring structure adapted to the ring plate 4068, after the mold 4 enters the top of the lifting platform 106 horizontally or vertically, the ring cylinder 108 can stably push the ring plate 4068 after rising, thereby providing power for the upward movement of the second rack 4066, which is beneficial to improving the operation convenience of the device during low-pressure casting production.

[0031] In the specific implementation process, Figure 3 , Figure 4 , Figure 6 and Fig. 9 - Fig.11As shown, the interior of the first mold body 401 is provided with evenly distributed channels 407, and the bottom diagonal positions of the first mold body 401 are provided with two central axis symmetrically arranged through-holes 408, and the two through-holes 408 are respectively connected to the two ends of the channel 407, and the tops of the first base 301 and the second base 303 are both installed with a switching mechanism 5, and the switching mechanism 5 includes two outer frames 501 arranged side by side, and rollers 502 are rotatably installed inside the two ends of the outer frames 501, and the outer sides of the two rollers 502 are jointly sleeved with an annular belt 503 that is slidably connected to the outer frames 501, and the outer frames 501 cooperate with the annular belt 503 to form a closed chamber, and the annular belt 503 is provided with evenly distributed through holes 504, and the through holes 504 are arranged corresponding to the through-holes 408, and the inner side of the annular belt 503 is installed with a valve member 505 connected to the through hole 504, and the roller 502 is surrounded by a groove for smooth movement of the through hole 504.

[0032] The top of the endless belt 503 located on the first base 301 is flush with the top of the second electric conveyor belt 302, and has the same length and rotation speed as the inner conveyor belt of the second electric conveyor belt 302. The top of the endless belt 503 located on the second base 303 is flush with the top of the third electric conveyor belt 304, and has the same length and rotation speed as the inner conveyor belt of the third electric conveyor belt 304. The two outer frames 501 located on the first base 301, one is connected to the air outlet of the external hot air flow supply mechanism, and the other is connected to the air return port of the external hot air flow supply mechanism. The two outer frames 501 located on the second base 303, one is connected to the air outlet of the external cold air flow supply mechanism, and the other is connected to the air return port of the external cold air flow.

[0033] When the device is used, when the mold 4 is placed on the second electric conveyor belt 302 or the third electric conveyor belt 304 and is transported in an orderly manner, since the rotation speed of the corresponding endless belt 503 is consistent with the rotation speed of the conveyor belts in the second electric conveyor belt 302 and the third electric conveyor belt 304, the opening 408 opened at the bottom of the first mold body 401 will be continuously aligned with the corresponding through hole 504 opened on the endless belt 503. When the mold 4 is transported on the second electric conveyor belt 302, the staff can continuously supply hot air to the channel 407 opened in the mold 4 through the hot air supply mechanism. In the cyclic hot air flow supply operation, the hot air flow is transported to the enclosed space formed by the outer frame 501 and the annular belt 503 on one side of the first base 301, and then enters the channel 407 through the docking of the through hole 504 and the opening 408, and is guided out from the other opening 408 to enter the enclosed space formed by another outer frame 501 and the annular belt 503 on the first base 301, and finally flows back to the hot air flow supply mechanism. Under the cyclic operation, the preheating operation in the mold 4 is realized, which is beneficial to increase the temperature of the mold 4 when the aluminum alloy melt is injected, so as to ensure the quality of the aluminum alloy parts after low-pressure casting.

[0034] When the mold 4 is conveyed on the third electric conveyor belt 304, the staff can continuously inject cold air into the channel 407 opened in the mold 4 through the cold air flow supply mechanism, and then the cold air flow conveys the second base 303 into the enclosed space formed by the outer frame 501 and the ring belt 503 on one side, and then enters the channel 407 through the docking of the through hole 504 and the opening 408, and is guided out from the other opening 408 to enter the enclosed space formed by another outer frame 501 and the ring belt 503 on the second base 303, and finally flows back to the cold air flow supply mechanism. Under the cyclic operation, the mold 4 is actively cooled, which can effectively improve the efficiency of solidification and molding of the aluminum alloy melt in the cavity 403. The device integrates the preheating of the mold 4 before casting and the cooling of the mold 4 after casting into the conveying process of the mold 4, which can further improve production efficiency.

[0035] In the specific implementation process, Fig. 9 As shown, a third chamber 6 is opened in the box body 101 and is located between the first chamber 102 and the second chamber 105, and the interior of the third chamber 6 and the interior of the hot air flow supply mechanism form an air flow circulation loop. When the device is in use, since the third chamber 6 is arranged above the first chamber 102, the internal space of the third chamber 6 can be heated by the high-temperature aluminum alloy melt in the insulation cylinder 103. By forming an air flow circulation loop with the interior of the third chamber 6 and the interior of the hot air flow supply mechanism, the high temperature of the aluminum alloy melt in the insulation cylinder 103 can be used as a heat source for the hot air flow supply mechanism, thereby reducing the heating power of the hot air flow supply mechanism, which is beneficial to reducing the energy consumption in the production process of the device and realizing energy-saving production.

[0036] In the specific implementation process, Fig.11 and Fig.12As shown, the valve member 505 includes an L-shaped tube 5051 fixedly connected to the through hole 504, and one end of the L-shaped tube 5051 away from the through hole 504 is fixedly connected to a receiving tube 5052 perpendicular to the inner end wall of the annulus 503, a valve block 5053 is slidably inserted in the receiving tube 5052, and a second spring 5054 installed in the receiving tube 5052 is fixedly connected to the side of the valve block 5053 close to the inner end wall of the annulus 503. The valve block 5053 is inserted into the L-shaped tube 5051 under the elastic support of the second spring 5054, and the end of the L-shaped tube 5051 is blocked, and a magnet 5055 is fixedly embedded on the side of the valve block 5053 close to the inner end wall of the annulus 503. When the device is used, the mold 4 is above the annulus 503 during the conveying process. The through hole 504 formed on the upper surface of the annulus 503 is aligned with the through opening 408. Since the first mold body 401 is close to the magnet 5055 fixed on the valve block 5053 in the corresponding valve member 505, the magnet 5055 can overcome the elastic support of the second spring 5054 and approach the first mold body 401 under the magnetic attraction of the magnet 5055 to the first mold body 401, thereby driving the valve block 5053 to move toward the first mold body 401, so that the valve block 5053 is retracted into the storage tube 5052, and the end of the L-shaped tube 5051 is opened. At this time, the enclosed space formed by the outer frame 501 and the annulus 503 is connected with the through hole 504 through the L-shaped tube 5051, and the internal airflow can circulate with the inside of the channel 407 through the through opening 408.

[0037] Among the remaining numerous through holes 504 on the annular belt 503 that are not aligned with the through opening 408, if they are at the bottom of the first mold body 401, the through hole 504 here is in a closed state due to the close fit between the bottom of the first mold body 401 and the annular belt 503; if they are exposed to the outside, the magnet 5055 in the corresponding valve component 505 is not close to the first mold body 401, so that the magnet 5055 does not play a magnetic attraction role. Under the elastic support of the second spring 5054, the valve block 5053 can be stably sealed at the end of the L-shaped tube 5051, so that the through hole 504 here is also in a closed state, thereby ensuring that only when the through hole 504 is aligned with the through opening 408, the enclosed space formed by the outer frame 501 and the annular belt 503 can interact with the airflow in the channel 407. The valve component 505 is connected to the inner side of the through hole 504, which can ensure the stability of the device when the mold 4 is preheated and actively cooled by airflow during the movement of the mold 4.

[0038] In the specific implementation process, Figure 1 , Figure 2 and Figure 8As shown, a second frame 7 mounted above the second base 303 is fixedly installed on the outer side of one end close to the main platform 1, and a plurality of vertically arranged third hydraulic push rods 701 are fixedly installed on the second frame 7, and a second pressing plate 702 fixed together with the telescopic ends of the plurality of third hydraulic push rods 701 is horizontally installed on the inner side of the second frame 7, a plurality of evenly distributed first rollers 203 are rotatably installed on the bottom of the first pressing plate 202, and a plurality of evenly distributed second rollers 703 are rotatably installed on the bottom of the second pressing plate 702. When the device is used, after the operation of injecting aluminum alloy melt into the cavity 403 is completed, the second vertical pipe 107 is separated from the docking port 404. At this time, the upper first hydraulic push rod 201 and the lower second hydraulic push rod 204 still maintain a stable extrusion force on the mold 4. In this state, the first electric conveyor belt 3 is powered on and started. The mold 4 is conveyed onto the third electric conveyor belt 304. During the process of the mold 4 being conveyed onto the third electric conveyor belt 304, the telescopic end of the third hydraulic push rod 701 controls the second pressure plate 702 to move downward, and applies the extrusion force to the moving mold 4 from top to bottom, which can ensure the mold tightness during the removal of the mold 4 and extend the internal pressure holding time during the removal of the mold 4, which is beneficial to improving the quality of low-pressure casting of aluminum alloy parts. By rotatably installing the rotatable first roller 203 on the bottom of the first pressure plate 202 and rotatably installing the rotatable second roller 703 on the bottom of the second pressure plate 702, the friction resistance between the top of the mold 4 and the first pressure plate 202 and the second pressure plate 702 can be reduced, which is beneficial to ensure the smoothness of the mold 4 being transferred from the first electric conveyor belt 3 to the third electric conveyor belt 304 while maintaining a pressurized state.

[0039] Specifically, the working principle and operation method of the present invention are as follows: Place a plurality of molds 4 on the second electric conveyor belt 302 in order, so that the opening 408 is aligned with the through hole 504, and the mold 4 is transported to the first electric conveyor belt 3 through the second electric conveyor belt 302. During the transportation process, the hot air flow supply mechanism supplies hot air flow in a continuous cycle in the channel 407 through the closed space formed by the outer frames 501 on both sides of the first base 301 and the endless belt 503, so as to preheat the mold 4 during the transportation process. When the mold 4 moves to the first electric conveyor belt 3, the first hydraulic push rod 201 and the second hydraulic push rod 204 are powered on and started at the same time, and extrusion force is applied to the mold 4 from both the upper and lower sides at the same time, and then air flow is filled into the second chamber 105 through the air supply mechanism, so that the lifting platform 106 drives the second vertical pipe 107 and the ring tube 108 to move upward, the second vertical pipe 107 is inserted into the docking port 404, the ring tube 108 is inserted into the ring groove 4067, and the ring plate 4068 is pushed up, so that the valve plate 4061 is withdrawn from the connection between the docking port 404 and the flow channel 405, and air flow is filled into the first chamber 102 through the air supply mechanism, so that the aluminum alloy melt in the heat preservation cylinder 103 passes through the first vertical pipe 107 and the ring tube 108. The pipe 104 enters the flow channel 405 along the second vertical pipe 107, and finally fills the mold cavity 403 from bottom to top. After the aluminum alloy melt is injected, the inflation operation in the first chamber 102 is interrupted, and then the second chamber 105 is evacuated, so that the lifting platform 106 drives the second vertical pipe 107 and the ring tube 108 to move downward, and the second vertical pipe 107 is separated from the docking port 404. After the ring tube 108 loses its push, the valve plate 4061 is reinserted into the connection between the docking port 404 and the flow channel 405 under the elastic support of the first spring 4062, so as to ensure the aluminum alloy melt. The molten metal is stable in the cavity 403, and then the first electric conveyor belt 3 is started, and the mold 4 is moved out in cooperation with the third electric conveyor belt 304. During the movement of the mold 4, the third hydraulic push rod 701 controls the second pressure plate 702 to press on the top of the mold 4 to ensure the mold stability of the mold 4. When the mold 4 is conveyed on the third electric conveyor belt 304, the through port 408 is aligned with the through hole 504. Through the cooperation of the cold air flow supply mechanism and the switching mechanism 5, the cold air flow can be circulated into the channel 407 to accelerate the cooling and shaping efficiency of the aluminum alloy melt in the cavity 403.

[0040] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-pressure casting device for aluminum alloy parts, comprising a main machine (1), characterized in that: A box (101) is installed in the middle of the main unit (1), and a first chamber (102) is opened at a lower position inside the box (101), a heat preservation cylinder (103) is fixedly installed in the first chamber (102), and a vertically arranged first vertical pipe (104) is fixedly connected to the heat preservation cylinder (103), and the bottom of the first vertical pipe (104) is connected to the inside of the heat preservation cylinder (103), and a second chamber (105) is opened at an upper position inside the box (101), and the box (101) is fixedly connected to the heat preservation cylinder (103). A lifting platform (106) is slidably installed in the middle position of the top and is lifted and lowered, and a second vertical pipe (107) is fixedly installed in the middle position of the lifting platform (106). The lower end of the second vertical pipe (107) is slidably inserted in the first vertical pipe (104). The interiors of the first chamber (102) and the second chamber (105) are both connected to the air supply mechanism. A first frame (2) erected above the main frame (1) is fixedly installed on the outside of the main frame (1), and a vertically arranged A first hydraulic push rod (201), a first pressing plate (202) fixedly connected to the telescopic end of the first hydraulic push rod (201) is horizontally installed on the inner side of the first frame (2), a second hydraulic push rod (204) vertically arranged is fixedly installed at the four corners of the box (101), and the telescopic end of the second hydraulic push rod (204) is fixedly connected to the box (101), first electric conveyor belts (3) arranged side by side are fixedly installed on both sides of the top of the box (101), and a first A base (301) is provided, and second electric conveyor belts (302) are fixedly mounted on both sides of the top of the first base (301) and are connected to the first electric conveyor belt (3). A second base (303) is mounted on the other side of the main machine platform (1), and third electric conveyor belts (304) are fixedly mounted on both sides of the top of the second base (303) and are connected to the first electric conveyor belt (3). Molds (4) are placed on the first electric conveyor belt (3), the second electric conveyor belt (302) and the third electric conveyor belt (304).

2. The low-pressure casting device for aluminum alloy parts according to claim 1, characterized in that: The mold (4) comprises a first mold body (401) located at the bottom, and the first mold body (401) is covered with a second mold body (402), a mold cavity (403) is provided on the contact surface between the first mold body (401) and the second mold body (402), a docking port (404) adapted to the outer size of the upper end of the second vertical pipe (107) is provided at the bottom of the first mold body (401), a flow channel (405) connected between the lowest point of the bottom of the mold cavity (403) and the docking port (404) is provided in the first mold body (401), and a blocking mechanism (406) is provided between the docking port (404) and the flow channel (405).

3. The low-pressure casting device for aluminum alloy parts according to claim 2, characterized in that: The bottom of the first mold body (401) is configured as a square structure, and the docking port (404) is opened at the center of the bottom of the first mold body (401).

4. The low-pressure casting device for aluminum alloy parts according to claim 3, characterized in that: The blocking mechanism (406) comprises a valve plate (4061) slidably inserted in the connection position between the docking port (404) and the flow channel (405); a first spring (4062) for elastically supporting the valve plate (4061) is installed in the first mold body (401); the valve plate (4061) is blocked between the docking port (404) and the flow channel (405) under the elastic support of the first spring (4062); a first rack (4063) is arranged on the valve plate (4061); a first gear (4064) meshing with the first rack (4063) is rotatably installed in the first mold body (401); a second gear (4065) coaxially arranged with the first gear (4064) is fixedly installed on the first gear (4064); a second rack (4066) meshing with the second gear (4065) is vertically slidable in the first mold body (401); and a ring cylinder (108) is fixedly installed on the top of the lifting platform (106).

5. The low pressure casting device for aluminum alloy parts according to claim 4, characterized in that: The bottom of the first mold body (401) is provided with an annular groove (4067) coaxially sleeved on the outside of the docking port (404), and a ring plate (4068) fixedly connected to the lower end of the second rack (4066) is slidably installed in the annular groove (4067), and the annular cylinder (108) is adapted to fit the annular plate (4068).

6. The low pressure casting device for aluminum alloy parts according to claim 2, characterized in that: The first mold body (401) is provided with evenly distributed channels (407) inside, and two central axis-symmetrically arranged through openings (408) are provided at diagonal positions at the bottom of the first mold body (401), and the two through openings (408) are respectively connected to the two ends of the channel (407), and the tops of the first base (301) and the second base (303) are both installed with a switching mechanism (5), and the switching mechanism (5) includes two outer frames (501) arranged side by side, and rollers (502) are rotatably installed inside the two ends of the outer frames (501), and the outer sides of the two rollers (502) are jointly sleeved with an annular belt (503) slidably connected to the outer frames (501), and the outer frames (501) cooperate with the annular belt (503) to rotate. ) constitutes a closed chamber, the annular belt (503) is provided with evenly distributed through holes (504), and the through holes (504) are arranged corresponding to the through opening (408), the inner side of the annular belt (503) is provided with a valve member (505) connected to the through hole (504), and the roller (502) is provided with a groove around the through hole (504) for smooth movement of the through hole (504), the two outer frames (501) located on the first base (301), one is connected to the air outlet of the external hot air flow supply mechanism, and the other is connected to the air return port of the external hot air flow supply mechanism, and the two outer frames (501) located on the second base (303), one is connected to the air outlet of the external cold air flow supply mechanism, and the other is connected to the air return port of the external cold air flow.

7. The low pressure casting device for aluminum alloy parts according to claim 6, characterized in that: The box body (101) is provided with a third chamber (6) located between the first chamber (102) and the second chamber (105), and the interior of the third chamber (6) and the interior of the hot air flow supply mechanism form an air flow circulation loop.

8. The low pressure casting device for aluminum alloy parts according to claim 6, characterized in that: The valve member (505) comprises an L-shaped tube (5051) fixedly connected to the through hole (504), and one end of the L-shaped tube (5051) away from the through hole (504) is fixedly connected to a receiving tube (5052) perpendicular to the inner end wall of the annular belt (503), a valve block (5053) is slidably inserted in the receiving tube (5052), and a second spring (5054) installed in the receiving tube (5052) is fixedly connected to a side of the valve block (5053) close to the inner end wall of the annular belt (503), the valve block (5053) is inserted into the L-shaped tube (5051) under the elastic support of the second spring (5054), and blocks the end of the L-shaped tube (5051), and a magnet (5055) is fixedly embedded on a side of the valve block (5053) close to the inner end wall of the annular belt (503).

9. The low pressure casting device for aluminum alloy parts according to claim 1, characterized in that: A second frame (7) mounted above the second base (303) is fixedly mounted on the outer side of one end close to the main platform (1), and a plurality of vertically arranged third hydraulic push rods (701) are fixedly mounted on the second frame (7), and a second pressing plate (702) fixed together with the telescopic ends of the plurality of third hydraulic push rods (701) is horizontally mounted on the inner side of the second frame (7).

10. The low pressure casting device for aluminum alloy parts according to claim 9, characterized in that: A plurality of evenly distributed first rollers (203) are rotatably mounted on the bottom of the first pressing plate (202), and a plurality of evenly distributed second rollers (703) are rotatably mounted on the bottom of the second pressing plate (702).

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