Automobile beam aluminum alloy low-pressure casting device based on electromagnetic stirring

Abstract

The invention belongs to the technical field of low-pressure casting machinery, and relates to an automobile cross beam aluminum alloy low-pressure casting device based on electromagnetic stirring, which comprises a supporting table, a female die, a male die, an upper top plate and a hydraulic cylinder, a first barrel is fixedly mounted on the supporting table, the female die is sleeved with the first barrel, and a gap is formed between the first barrel and the female die; a second liquid inlet pipe is fixed to the upper top plate, a buffer pipe is installed above the second liquid inlet pipe, a gravity sliding block is installed in the buffer pipe, a second round barrel is fixedly installed above the second liquid inlet pipe, and a first liquid inlet pipe communicated with an inner cavity of the second round barrel is installed on one side of the second round barrel; a first flow adjusting structure is installed between the first liquid inlet pipe and the second liquid inlet pipe, a second flow adjusting structure is installed at the lower end of the buffer pipe, the pressure of metal liquid injected into the die changes continuously, the gravity sliding block enables the liquid to vibrate, bubbles are prevented from entering the female die, and the casting quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-pressure casting machinery, and relates to a low-pressure casting device for aluminum alloy automotive cross beams based on electromagnetic stirring. Background Art

[0002] The automotive cross beam is an important part of the automotive chassis structure. During the casting process of the automotive cross beam, the quality of the molten metal injected into the mold has a great influence on the quality of the casting.

[0003] The Chinese patent with the publication number CN117282943A discloses a device including a frame, a holding furnace, a driving mechanism, and a liquid-lifting assembly: a workbench for placing a mold is arranged on the frame; the holding furnace is located below the workbench for holding molten metal, the liquid-lifting assembly is installed on the furnace cover at the top of the holding furnace, the lower end of the liquid-lifting assembly is immersed in the molten metal in the holding furnace, and the upper end of the liquid-lifting assembly is adapted to communicate with the mold on the workbench; the driving mechanism is installed on the top of the furnace cover and cooperates with the liquid-lifting assembly.

[0004] In the above prior art, during the process of injecting liquid into the mold cavity, the liquid pressure remains constant all the time, and there are inevitably bubbles remaining in the molten metal. After the bubbles enter the mold cavity, it affects the casting quality.

[0005] To solve the above problems, the present invention proposes a low-pressure casting device for aluminum alloy automotive cross beams based on electromagnetic stirring. Summary of the Invention

[0006] To solve the problems in the background art, the present invention proposes a low-pressure casting device for aluminum alloy automotive cross beams based on electromagnetic stirring.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A low-pressure casting device for aluminum alloy automotive cross beams based on electromagnetic stirring, including a support table, a female mold, a male mold, an upper top plate, a hydraulic cylinder, and a first cylinder. The first cylinder is sleeved outside the female mold and fixedly connected to the support table. There is a gap between the first cylinder and the female mold, and the gap between the first cylinder and the female mold forms a magnetic field cavity, and an electromagnetic device is installed in the magnetic field cavity; A second liquid inlet pipe is fixedly installed above the upper top plate. The lower end of the second liquid inlet pipe penetrates downward through the male mold. A buffer pipe communicating with the second liquid inlet pipe is installed above the second liquid inlet pipe. A gravity slider is vertically slidably installed in the buffer pipe. A second cylinder is fixedly installed above the second liquid inlet pipe. A first liquid inlet pipe communicating with the inner cavity of the second cylinder is installed on one side of the second cylinder. A first flow regulating structure is installed between the first liquid inlet pipe and the second liquid inlet pipe. A second flow regulating structure is installed at the lower end of the buffer pipe; The first flow rate regulating structure regulates the flow rate of the liquid entering the second liquid inlet pipe, and the second flow rate regulating structure regulates the flow rate of the liquid entering the buffer pipe. A first driving structure is installed between the first flow rate regulating structure and the second flow rate regulating structure. The first driving structure drives the first flow rate regulating structure and the second flow rate regulating structure to perform flow rate regulation according to opposite flow rate change trends.

[0008] Preferably, a first annular cylinder is fixedly installed inside the second cylinder. The bottom of the first annular cylinder is closed. There is a gap between the first annular cylinder and the second cylinder, and there is a gap between the lower end of the first annular cylinder and the bottom of the second cylinder. The gaps between the first annular cylinder and the second cylinder and between the lower end of the first annular cylinder and the bottom of the second cylinder communicate with each other to form a liquid inlet cavity, and the first liquid inlet pipe communicates with the liquid inlet cavity; A plurality of liquid outlet holes are circumferentially and evenly arranged on the first annular cylinder. The liquid outlet holes communicate the inner cavity of the first annular cylinder with the liquid inlet cavity. The upper end of the second liquid inlet pipe communicates with the inner cavity of the first annular cylinder, and the first flow rate regulating structure is installed inside the first annular cylinder.

[0009] Preferably, a rotating cylinder is rotatably installed above the second cylinder. The rotating cylinder is rotatably connected to the buffer pipe. A fixed ring located inside the rotating cylinder is fixedly installed at the bottom of the buffer pipe. The second flow rate regulating structure is installed inside the fixed ring, and the second flow rate regulating structure communicates the buffer pipe and the inner cavity of the first annular cylinder.

[0010] Preferably, a rotating top cover is fixedly installed at the lower end of the rotating cylinder. The rotating top cover is rotatably installed on the second cylinder. The top wall of the rotating top cover fits against the top wall of the first annular cylinder. A liquid separating pipe communicating with the inner cavity of the first annular cylinder is fixedly installed on the rotating top cover. The second flow rate regulating structure is located between the buffer pipe and the liquid separating pipe.

[0011] Preferably, the first flow rate regulating structure includes: eccentric wheels. A plurality of eccentric wheels are circumferentially and evenly installed inside the first annular cylinder. A vertical rotating shaft is fixedly installed on the eccentric wheel. The upper end of the rotating shaft penetrates through the top wall of the rotating top cover and is located inside the rotating cylinder above the rotating top cover. The rotating shaft is rotatably connected to the top wall of the rotating top cover; A motor is connected to one of the rotating shafts; Sprockets. A plurality of sprockets are provided and correspond to the rotating shafts one by one. The sprockets are fixedly installed on the corresponding rotating shafts; A chain. The chain is sleeved outside the sprockets and meshes with the sprockets at the same time.

[0012] Preferably, the second flow rate regulating structure includes a fixed baffle. The cross-section of the fixed baffle is trapezoidal. Six fixed baffles are provided, and the fixed baffles are circumferentially and evenly arranged in the fixed ring. Adjacent fixed baffles are in contact with each other, and the six fixed baffles form a structure with a regular hexagon cross-section. Rotating baffles, six rotating baffles are provided. The rotating baffles are located inside the fixed baffles. The fixed baffles are in contact with the rotating baffles, and adjacent rotating baffles are in contact with each other. Among them, three rotating baffles are fixedly connected to the fixed baffles, and the other three rotating baffles are rotatably connected to the fixed baffles; the rotating baffles fixedly connected to the fixed baffles and the rotating baffles rotatably connected to the fixed baffles are arranged at intervals. On each of the rotating baffles rotatably connected to the fixed baffle, a rotating shaft with an axis arranged horizontally is fixedly installed. The end of the rotating shaft away from the rotating baffle passes through the corresponding fixed baffle and is located outside the fixed baffle. A torsion spring is installed between the rotating shaft and the fixed baffle, and the first driving structure is installed between the rotating shaft and the rotating shaft. On each of the rotating baffles fixedly connected to the fixed baffle, a connecting shaft with an axis arranged horizontally is fixedly installed. The end of the connecting shaft away from the rotating baffle is fixedly connected to the corresponding fixed baffle and is located outside the corresponding fixed baffle.

[0013] Preferably, the first driving structure includes: an incomplete gear, three incomplete gears are provided, and the incomplete gears correspond to the rotating shafts one by one, and the incomplete gears are fixedly connected to the rotating shafts; A cylindrical gear, the cylindrical gear is coaxially and fixedly installed on the corresponding rotating shaft; An L-shaped plate, the L-shaped plate is slidably connected to the fixed ring, and the length direction of the L-shaped plate is parallel to the side length direction of the regular hexagon formed by the fixed baffles; The L-shaped plate includes a horizontal plate and a vertical plate. The horizontal plate and the vertical plate are perpendicular to each other. A second rack is fixedly installed on the upper end surface of the horizontal plate, the second rack meshes with the cylindrical gear, and a first rack is fixedly installed on the end surface of the vertical plate, and the first rack meshes with the incomplete gear.

[0014] Preferably, six guide plates are circumferentially and evenly arranged inside the fixed ring. The guide plates are connected end to end and are fixedly connected to the fixed ring. The six guide plates form a regular hexagon, and the vertical cross-section where the sides of the regular hexagon formed by the guide plates are located is parallel to the vertical cross-section where the sides of the regular hexagon formed by the fixed baffles are located; Each of the fixed baffles is provided with a rectangular groove arranged parallel to the fixed baffle. A rectangular block is fixedly installed on each rotating shaft and each connecting shaft. The rectangular block is located in the rectangular groove and is slidably connected to the rectangular groove.

[0015] Preferably, a plurality of pushing blocks are circumferentially and uniformly arranged on the inner wall of the rotating barrel. The pushing blocks correspond to the rectangular blocks one by one. A plurality of arc-shaped grooves are formed in the fixed ring. The arc-shaped grooves correspond to the fixed ring one by one. The rectangular block cooperates with the fixed ring. A plurality of set bolts are threadedly installed on the rotating top cover. The set bolts penetrate through the side wall of the rotating top cover and abut against the outer wall of the second cylindrical barrel.

[0016] Preferably, the outer wall of the gravity slider fits with the inner wall of the buffer tube. A spring is installed in the buffer tube. One end of the spring is fixed on the buffer tube, and the other end of the spring is fixed on the gravity slider.

[0017] Compared with the prior art, the present invention has the following beneficial effects: When the flow rate of the first flow regulating structure increases and the flow rate of the second regulating structure decreases, the liquid pressure entering the buffer tube increases to drive the gravity slider to move upward, so that the liquid volume in the buffer tube increases. When the flow rate of the first flow regulating structure decreases and the flow rate of the second regulating structure increases, the liquid pressure entering the buffer tube decreases. Under the action of the gravity of the gravity slider, the gravity slider moves downward, pressing the liquid in the buffer tube downward into the first annular cylinder to impact and vibrate the liquid in the second liquid inlet pipe. At the same time, during the upward movement of the buffer tube, the bubbles in the liquid float upward, and the reciprocating vibration of the gravity slider causes the liquid in the buffer tube to vibrate continuously, crushing and dispersing the bubbles in the liquid to prevent the influence of the bubbles on the casting. The defective rate of the casting is reduced, and the casting quality is improved.

[0018] Meanwhile, the liquid pressure entering the first liquid inlet pipe changes continuously, and the liquid pressure will impact the liquid in the second liquid inlet pipe. In this way, the liquid pressure entering the die cavity also changes continuously. During the process of injecting the solution into the die cavity, the bubbles can be dispersed. The casting quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the connection between the die cavity and the support table of the present invention; Figure 3 is a structural schematic diagram of the connection between the die cavity and the first cylindrical barrel of the present invention; Figure 4 is a structural schematic diagram of the installation among the buffer tube, the first liquid inlet pipe and the second liquid inlet pipe of the present invention; Figure 5 It is a schematic structural diagram of the installation between the first flow rate regulating structure and the second flow rate regulating structure of the present invention; Figure 6 It is a schematic sectional structure diagram of the installation between the second cylinder and the rotating barrel of the present invention; Figure 7 It is the present invention Figure 5 Schematic sectional structure diagram after removing the rotating barrel in the present invention; Figure 8 It is a schematic structural diagram of the first driving structure connecting the first flow rate regulating structure and the second flow rate regulating structure of the present invention; Figure 9 It is a schematic structural diagram of the installation between the rotating barrel and the first flow rate regulating structure of the present invention; Figure 10 It is a schematic structural diagram of the installation of the second flow rate regulating structure of the present invention; Figure 11 It is a schematic top view structure diagram when the eccentric wheel is tangent in the present invention; Figure 12 It is a schematic top view structure diagram after the eccentric wheel rotates in the present invention; Figure 13 It is a schematic diagram of the state when the liquid outlet channel is the smallest in the present invention; Figure 14 It is a schematic diagram of the state after the liquid outlet channel is preliminarily adjusted in the present invention; Figure 15 It is a schematic diagram of the state when the second rotating baffle is in the vertical state in the present invention; Figure 16 It is the present invention Figure 15 Partial enlarged view at position A in the present invention.

[0020] In the figure: 1, support platform; 2, female die; 3, male die; 4, upper top plate; 5, hydraulic cylinder; 6, first cylinder; 601, magnetic field chamber; 7, buffer pipe; 8, first liquid inlet pipe; 9, second liquid inlet pipe; 10, set bolt; 11, torsion spring; 12, first annular cylinder; 1201, liquid outlet hole; 13, second cylinder; 1301, liquid inlet chamber; 14, rotating barrel; 1401, rotating top cover; 15, liquid separation pipe; 16, eccentric wheel; 1601, liquid inlet channel; 17, rotating shaft; 18, sprocket; 19, chain; 20, incomplete gear; 21, cylindrical gear; 22, L-shaped plate; 23, first rack; 24, second rack; 25, rotating shaft; 2501, connecting shaft; 26, fixed baffle; 27, rotating baffle; 2701, liquid outlet channel; 2702, first rotating baffle; 2703, second rotating baffle; 28, rectangular groove; 29, rectangular block; 30, guide plate; 31, fixed ring; 32, arc groove; 33, pushing block; 34, gravity slider; 35, spring. Detailed implementation manners

[0021] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0022] As Figures 1 - 16 shown, the technical solution adopted by the present invention is as follows: an aluminum alloy low-pressure casting device for an automotive crossbeam based on electromagnetic stirring.

[0023] It includes a support table 1, a female mold 2, a male mold 3, an upper top plate 4, and a hydraulic cylinder 5. As shown in the attached Figure 1 figure, the upper top plate 4 and the support table 1 are arranged in parallel. The upper top plate 4 is located above the support table 1. The upper top plate 4 is connected to the support table 1 through the hydraulic cylinder 5. The male mold 3 is fixed to the lower end of the upper top plate 4. The female mold 2 is fixed to the upper end of the support table 1, and the female mold 2 and the male mold 3 cooperate with each other.

[0024] After the female mold 2 and the male mold 3 are closed, aluminum alloy solution is injected into the female mold 2, and casting is carried out under the action of the female mold 2 and the male mold 3. The hydraulic cylinder 5 drives the upper top plate 4 to move vertically, thereby driving the male mold 3 to move vertically, so that the male mold 3 approaches or disengages from the female mold 2 to perform casting operations or facilitate the removal of the castings that have been completed. The specific casting process is the prior art and will not be elaborated in detail here.

[0025] A first cylinder 6 is fixedly installed on the support table 1. The first cylinder 6 is sleeved outside the female mold 2. There is a gap between the first cylinder 6 and the female mold 2. The gap between the first cylinder 6 and the female mold 2 forms a magnetic field chamber 601, and an electromagnetic device is installed in the magnetic field chamber 601.

[0026] The electromagnetic device emits electromagnetic waves, and the electromagnetic waves perform electromagnetic stirring on the molten metal solution entering the female mold 2. This is the prior art and will not be elaborated in detail here.

[0027] A second liquid inlet pipe 9 is fixedly installed above the upper top plate 4. The lower end of the second liquid inlet pipe 9 penetrates downward through the male mold 3. A buffer pipe 7 communicating with the second liquid inlet pipe 9 is installed above the second liquid inlet pipe 9. A second cylinder 13 is fixedly installed above the second liquid inlet pipe 9. A horizontal first liquid inlet pipe 8 communicating with the inner cavity of the second cylinder 13 is installed on one side of the second cylinder 13. A first flow rate regulating structure is installed between the first liquid inlet pipe 8 and the second liquid inlet pipe 9, and a second flow rate regulating structure is installed at the lower end of the buffer pipe 7.

[0028] In use, connect the first liquid inlet pipe 8 to an appliance containing a liquid metal solution. Preferably, it is a crucible. Heat and keep the crucible warm during use.

[0029] The metal solution enters the second liquid inlet pipe 9 through the first liquid inlet pipe 8 and the first flow rate regulating structure. And it flows out from the second liquid inlet pipe 9 and into the female mold 2.

[0030] A gravity slider 34 is vertically and slidably installed in the buffer pipe 7.

[0031] Specifically, as shown in the appendix Figure 5 As shown, the side wall of the gravity slider 34 fits against the inner wall of the buffer pipe 7. A spring 35 is installed in the buffer pipe 7. One end of the spring 35 is fixed on the buffer pipe 7, and the other end of the spring 35 is fixed on the gravity slider 34.

[0032] Of course, hydraulic oil can be injected into the chamber of the buffer pipe 7 above the gravity slider 34.

[0033] The hydraulic oil has the same function as the spring 35. Both are used to assist the gravity slider 34 to move downward and assist in crushing bubbles.

[0034] The first flow rate regulating structure regulates the liquid flow rate entering the second liquid inlet pipe 9, and the second flow rate regulating structure regulates the liquid flow rate entering the buffer pipe 7. A first driving structure is installed between the first flow rate regulating structure and the second flow rate regulating structure. The first driving structure drives the first flow rate regulating structure and the second flow rate regulating structure to perform flow rate regulation according to opposite flow rate change trends.

[0035] When the flow rate of the first flow rate regulating structure increases and the flow rate of the second regulating structure decreases, the liquid pressure entering the buffer pipe 7 increases and drives the gravity slider 34 to move upward. The spring 35 is deformed under pressure, or the hydraulic oil is compressed. When the flow rate of the first flow rate regulating structure decreases and the flow rate of the second regulating structure increases, the liquid pressure entering the buffer pipe 7 decreases. Under the combined force formed by the gravity of the gravity slider 34 and the elastic force of the spring 35, or the combined force formed by the gravity of the gravity slider 34 and the hydraulic oil pressure, the gravity slider 34 moves downward.

[0036] As an optional embodiment, both the first flow rate regulating structure and the second flow rate regulating structure can select to use flow valves. The flow valves of the first flow rate regulating structure and the second flow rate regulating structure are controlled by a program to achieve opposite flow rate change trends of the two flow valves.

[0037] That is to say, when the flow rate of the flow valve of the first flow regulation structure increases and the flow rate of the flow valve of the second regulation structure decreases, the liquid pressure entering the buffer tube 7 increases, driving the gravity slider 34 to move upward. When the flow rate of the first flow regulation structure decreases and the flow rate of the second regulation structure increases, the liquid pressure entering the buffer tube 7 decreases, and the gravity slider 34 moves downward.

[0038] As another alternative embodiment, as shown in the appendix Figure 6 As shown, a first annular cylinder 12 is fixedly installed inside the second barrel 13. The bottom of the first annular cylinder 12 is closed.

[0039] There is a gap between the first annular cylinder 12 and the second barrel 13. There is a gap between the lower end of the first annular cylinder 12 and the bottom of the second barrel 13. The gap between the first annular cylinder 12 and the second barrel 13 and the gap between the lower end of the first annular cylinder 12 and the bottom of the second barrel 13 communicate with each other to form a liquid inlet chamber 1301. The first liquid inlet pipe 8 communicates with the liquid inlet chamber 1301.

[0040] During use, a pressure pump is installed on the first liquid inlet pipe 8, and the pressure pump pumps the solution in the crucible into the liquid inlet chamber 1301 through the first liquid inlet pipe 8. The pressure pump is a well-known technology to those skilled in the art and is not shown in the drawings of this application.

[0041] A rotating barrel 14 is rotatably installed above the second barrel 13. The rotating barrel 14 is rotatably connected to the buffer tube 7, and a rotating top cover 1401 is fixedly installed at the lower end of the rotating barrel 14. The top wall of the rotating top cover 1401 is attached to the top wall of the first annular cylinder 12.

[0042] The rotating top cover 1401 is rotatably installed on the second barrel 13. The top wall of the rotating top cover 1401 is attached to the top wall of the first annular cylinder 12. A plurality of set bolts 10 are threadedly installed on the rotating top cover 1401. The set bolts 10 penetrate through the side wall of the rotating top cover 1401 and abut against the outer wall of the second barrel 13. The set bolts 10 are used to limit the rotating top cover 1401.

[0043] A liquid separating tube 15 communicating with the inner cavity of the first annular cylinder 12 is fixedly installed on the rotating top cover 1401. To ensure sealing and meet the requirements of simple assembly and manufacturing, the overnight tube liquid separating tube 15 and the rotating top cover 1401 can be made into an integral shape.

[0044] A plurality of liquid outlet holes 1201 are circumferentially and evenly arranged on the first annular cylinder 12. The liquid outlet holes 1201 communicate the inner cavity of the first annular cylinder 12 with the liquid inlet chamber 1301.

[0045] The first flow rate regulating structure is installed within the first annular cylinder 12. The first flow rate regulating structure connects the liquid separation pipe 15 with the liquid outlet hole 1201.

[0046] As shown in the Figure 9 accompanying drawings, the first flow rate regulating structure includes an eccentric wheel 16. Among them, a plurality of eccentric wheels 16 are provided, and the plurality of eccentric wheels 16 are circumferentially and evenly installed within the first annular cylinder 12. A vertical rotating shaft 17 is fixedly installed on the eccentric wheel 16. The upper end of the rotating shaft 17 penetrates through the top wall of the rotating top cover 1401 and is located within the rotating barrel 14 above the rotating top cover 1401. The rotating shaft 17 is rotatably connected to the top wall of the rotating top cover 1401. A motor is connected to one of the rotating shafts 17. A sprocket 18 is fixedly installed on each rotating shaft 17. A chain 19 is commonly sleeved and installed outside the plurality of sprockets 18, and the chain 19 meshes with the sprockets 18 simultaneously.

[0047] As shown in the Figure 11 and the Figure 12 accompanying drawings, the interval between adjacent eccentric wheels 16 forms a liquid inlet channel 1601. When adjacent eccentric wheels 16 are tangent to each other, the blockage of the eccentric wheels 16 prevents the liquid in the liquid inlet cavity 1301 from entering the liquid separation pipe 15. When the eccentric wheels 16 rotate, the interval of the liquid inlet channel 1601 gradually increases. The flow rate of the liquid entering the liquid separation pipe 15 increases. As the eccentric wheels 16 continuously rotate, the interval of the liquid inlet channel 1601 periodically becomes larger and smaller, thereby adjusting the flow rate of the liquid entering the liquid separation pipe 15.

[0048] Meanwhile, during the continuous rotation of the eccentric wheels 16, the eccentric wheels 16 stir the liquid located within the first annular cylinder 12.

[0049] The bottom of the buffer pipe 7 is fixedly installed with a fixed ring 31 located within the rotating barrel 14, and the second flow rate regulating structure is installed within the fixed ring 31. The liquid separation pipe 15 is connected to the buffer pipe 7 through the second flow rate regulating structure.

[0050] As shown in the Figure 10 accompanying drawings, the second flow rate regulating structure includes: a fixed baffle 26 and a rotating baffle 27.

[0051] Among them: the cross-section of the fixed baffle 26 is trapezoidal. Six fixed baffles 26 are provided. The six fixed baffles 26 are circumferentially and evenly arranged within the fixed ring 31. Adjacent fixed baffles 26 are in mutual contact, and the six fixed baffles 26 form a structure with a regular hexagon cross-section.

[0052] The rotating baffle plates 27 are provided in six numbers. The rotating baffle plates 27 are located inside the fixed baffle plate 26. The fixed baffle plate 26 is in contact with the rotating baffle plates 27, and adjacent rotating baffle plates 27 are in contact with each other. Three of the rotating baffle plates 27 are fixedly connected to the fixed baffle plate 26. The other three rotating baffle plates 27 are rotatably connected to the fixed baffle plate 26. The rotating baffle plates 27 fixedly connected to the fixed baffle plate 26 and the rotating baffle plates 27 rotatably connected to the rotating baffle plates 27 are arranged at intervals.

[0053] A rotating shaft 25 with its axis arranged horizontally is fixedly installed on each of the rotating baffle plates 27 rotatably connected to the fixed baffle plate 26. One end of the rotating shaft 25 away from the rotating baffle plate 27 passes through the corresponding fixed baffle plate 26 and is located outside the fixed baffle plate 26. A torsion spring 11 is installed between the rotating shaft 25 and the fixed baffle plate 26. An installation groove is formed on the fixed baffle plate 26, the torsion spring 11 is installed in the installation groove and the torsion spring 11 is fixedly sleeved on the corresponding rotating shaft 25, and the outer end of the torsion spring 11 is fixedly connected to the corresponding fixed baffle plate 26.

[0054] Sealing members are installed at the upper end of the liquid separation pipe 15 and the lower end of the buffer pipe 7. The structure formed by the fixed baffle plate 26 and the rotating baffle plates 27 abuts against the liquid separation pipe 15 at the lower end, and the structure formed by the fixed baffle plate 26 and the rotating baffle plates 27 abuts against the buffer pipe 7 at the upper end. That is to say, a sliding seal is formed between the fixed baffle plate 26 and the liquid separation pipe 15 as well as the buffer pipe 7.

[0055] The first driving structure is installed between the rotating shaft 17 and the rotating shaft 25.

[0056] A connecting shaft 2501 with its axis arranged horizontally is fixedly installed on each of the rotating baffle plates 27 fixedly connected to the fixed baffle plate 26. One end of the connecting shaft 2501 away from the rotating baffle plate 27 is fixedly connected to the corresponding fixed baffle plate 26 and is located outside the corresponding fixed baffle plate 26.

[0057] For the convenience of description, the rotating baffle plates 27 fixedly connected to the fixed baffle plate 26 are named as the first rotating baffle plates 2702, and the rotating baffle plates 27 rotatably connected to the fixed baffle plate 26 are named as the second rotating baffle plates 2703. The second rotating baffle plates 2703 are arranged at intervals with the first rotating baffle plates 2702, the connecting shaft 2501 is arranged corresponding to the first rotating baffle plates 2702, and the rotating shaft 25 is arranged corresponding to the second rotating baffle plates 2703.

[0058] The chamber formed by the end faces of the rotating baffle plates 27 away from the fixed baffle plate 26 is the liquid outlet channel 2701. As shown in the attached Figure 14 and attached Figure 15As shown, when the second rotating baffle 2703 rotates along the axis of the rotating shaft 25, when the second rotating baffle 2703 is in the horizontal state, the cross-sectional area of the liquid outlet channel 2701 is the smallest; when the second rotating baffle 2703 is in the vertical state, the cross-sectional area of the liquid outlet channel 2701 is the largest. By adjusting the inclination state of the second rotating baffle 2703, the cross-sectional area of the liquid outlet channel 2701 is changed, thereby adjusting the flow rate entering the buffer tube 7.

[0059] As shown in the appendix Figure 8 As shown, the first driving structure includes: an incomplete gear 20, a cylindrical gear 21, and an L-shaped plate 22.

[0060] Among them, three incomplete gears 20 are provided, the incomplete gears 20 correspond to the rotating shafts 25 one by one, and the incomplete gears 20 are fixedly connected to the rotating shafts 17.

[0061] The cylindrical gear 21 is coaxially and fixedly installed on the corresponding rotating shaft 25.

[0062] The L-shaped plate 22 is slidably connected to the fixed ring 31, and the length direction of the L-shaped plate 22 is parallel to the side length direction of the regular hexagon formed by the fixed baffle 26.

[0063] The L-shaped plate 22 includes a horizontal plate and a vertical plate. The horizontal plate and the vertical plate are perpendicular to each other. A second rack 24 is fixedly installed on the upper end surface of the horizontal plate. The second rack 24 meshes with the cylindrical gear 21. A first rack 23 is fixedly installed on the end surface of the vertical plate. The first rack 23 meshes with the incomplete gear 20.

[0064] When the incomplete gear 20 rotates and the toothed part of the incomplete gear 20 meshes with the first rack 23, the incomplete gear 20 will drive the L-shaped plate 22 to move through the first rack 23, and the movement of the L-shaped plate 22 will push the cylindrical gear 21 to drive the rotating shaft 25 to rotate. Thereby causing the second rotating baffle 2703 to rotate. The rotation of the second rotating baffle 2703 changes the inclination state of the second rotating baffle 2703, realizing the change of the cross-sectional area of the liquid outlet channel 2701, thereby adjusting the flow rate entering the buffer tube 7.

[0065] The structure composed of the fixed baffle 26 and the rotating baffle 27 can move along the side length direction of the regular hexagon formed by the fixed baffle 26 to adjust the area of the liquid outlet channel 2701.

[0066] Specifically, six guiding plates 30 are evenly distributed on the inner circumference of the fixing ring 31. The guiding plates 30 are connected end to end and fixedly connected to the fixing ring 31. The six guiding plates 30 form a regular hexagon, and the vertical cross-section where the side of the regular hexagon formed by the guiding plates 30 is located is parallel to the vertical cross-section where the side of the regular hexagon formed by the fixing baffle 26 is located.

[0067] Each fixing baffle 26 is provided with a rectangular groove 28 arranged parallel to the fixing baffle 26. A rectangular block 29 is fixedly installed on each rotating shaft 25 and each connecting shaft 2501. The rectangular block 29 is located in the rectangular groove 28 and is slidably connected to the rectangular groove 28.

[0068] A plurality of pushing blocks 33 are evenly distributed on the inner wall of the rotating barrel 14 in a circumferential manner. The pushing blocks 33 correspond to the rectangular blocks 29 one by one. A plurality of arc-shaped grooves 32 are formed on the fixing ring 31. The arc-shaped grooves 32 correspond to the pushing blocks 33 one by one, and the rectangular block 29 cooperates with the fixing ring 31.

[0069] One end of the rectangular block 29 far from the rotating shaft 25 protrudes out of the rectangular groove 28. Each pushing block 33 includes two push plates, and both push plates are fixed on the inner wall of the rotating barrel 14 and are respectively located on both sides of the corresponding rectangular block 29.

[0070] Rotate the rotating barrel 14, and the rotating barrel 14 drives the pushing block 33 to rotate. When the pushing block 33 rotates, it pushes the rectangular block 29 to slide along the rectangular groove 28. As shown in the attached Figure 13 and attached Figure 14 figure, when the structure formed by the fixing baffle 26 and the rotating baffle 27 moves along the rectangular groove 28 in a direction away from the axis of the fixing ring 31, the cross-sectional area of the liquid outlet channel 2701 increases. When the structure formed by the fixing baffle 26 and the rotating baffle 27 moves along the rectangular groove 28 in a direction close to the axis of the fixing ring 31, the cross-sectional area of the liquid outlet channel 2701 decreases. By this method, the cross-sectional area of the liquid outlet channel 2701 can be initially adjusted.

[0071] A plurality of set bolts 10 are threadedly installed on the rotating top cover 1401. The set bolts 10 penetrate through the side wall of the rotating top cover 1401 and abut against the outer wall of the second barrel 13. After initially adjusting the cross-sectional area of the liquid outlet channel 2701, the position of the rotating barrel 14 can be fixed by rotating the set bolts 10.

[0072] Working principle: Before use, manually rotate the rotating barrel 14, and the rotating barrel 14 drives the fixing ring 31 to rotate. When the fixing ring 31 rotates, it pushes the rectangular block 29 to slide along the rectangular groove 28. Initially adjust the cross-sectional area of the liquid outlet channel 2701 according to the casting size.

[0073] Pour molten metal into the first liquid inlet pipe 8. Then start the hydraulic cylinder 5 to cause the punch 3 and the die 2 to close. Exhaust holes are provided on both the punch 3 and the die 2, which is a well-known prior art in this field and is not shown in the figure.

[0074] The electromagnetic device emits electromagnetic waves, which electromagnetically stir the molten metal solution entering the die 2.

[0075] Subsequently, start the pressure pump on the first liquid inlet pipe 8. The pressure pump pumps the liquid into the liquid inlet cavity 1301.

[0076] Start the motor again. The motor drives the rotating shaft 17 connected thereto to rotate. The rotating shaft 17 drives the corresponding sprocket 18 to rotate. The rotation of the sprocket 18 drives the remaining sprockets 18 and the rotating shafts 17 to rotate synchronously through the chain 19.

[0077] The rotation of the rotating shaft 17 drives the eccentric wheel 16 to rotate.

[0078] As shown in the attached Figure 11 and the attached Figure 12 As shown, the interval between adjacent eccentric wheels 16 forms a liquid inlet channel 1601. When adjacent eccentric wheels 16 are tangent, the blockage of the eccentric wheels 16 prevents the liquid in the liquid inlet cavity 1301 from entering the liquid separation pipe 15. When the eccentric wheels 16 rotate, the interval of the liquid inlet channel 1601 gradually increases. The liquid flow rate into the liquid separation pipe 15 increases. As the eccentric wheels 16 continuously rotate, the flow area of the liquid inlet channel 1601 periodically becomes larger and smaller, thereby adjusting the size of the liquid flow rate entering the liquid separation pipe 15.

[0079] When the rotating shaft 17 rotates, the rotating shaft 17 drives the associated incomplete gear 20 to rotate together. When the incomplete gear 20 rotates and the toothed part of the incomplete gear 20 meshes with the first rack 23, the incomplete gear 20 drives the L-shaped plate 22 to move through the first rack 23. The movement of the L-shaped plate 22 pushes the cylindrical gear 21 to drive the rotating shaft 25 to rotate. The torsion spring 11 on the rotating shaft 25 is torsionally deformed. When the toothed part of the incomplete gear 20 disengages from the first rack 23, under the action of the torsion spring 11, the rotating shaft 25 rotates in the reverse direction, and the rotating shaft 25 simultaneously drives the cylindrical gear 21 to rotate in the reverse direction. The cylindrical gear 21 drives the L-shaped plate 22 to move in the reverse direction and reset through the first rack 23.

[0080] The second rotating baffle 2703 reciprocally rotates. The rotation of the second rotating baffle 2703 changes the inclination state of the second rotating baffle 2703, realizing the change of the cross-sectional area of the liquid outlet channel 2701 so as to adjust the flow rate entering the buffer pipe 7.

[0081] It should be noted that when the eccentric wheel 16 is tangent, the second rotating baffle 2703 is in a vertical state. During the entire pumping process, the area of the liquid outlet channel 2701 is at its maximum value.

[0082] When the liquid inlet channel 1601 is at its maximum, the second rotating baffle 2703 is in a horizontal state. During the entire pumping process, the area of the liquid outlet channel 2701 is at its minimum value.

[0083] Thus, it is achieved that when the flow rate of the first flow regulating structure increases and the flow rate of the second regulating structure decreases, the liquid pressure entering the buffer tube 7 increases, driving the gravity slider 34 to move upward. When the flow rate of the first flow regulating structure decreases and the flow rate of the second regulating structure increases, the liquid pressure entering the buffer tube 7 decreases, and under the action of the gravity of the gravity slider 34, the gravity slider 34 moves downward.

[0084] Adjust the speed of the motor to achieve a rapid change in the flow rates of the first flow regulating structure and the second flow regulating structure under the action of the motor. When the flow rate of the first flow regulating structure increases and the flow rate of the second regulating structure decreases, the liquid pressure entering the buffer tube 7 increases, driving the gravity slider to move upward, increasing the liquid volume in the buffer tube 7. When the flow rate of the first flow regulating structure decreases and the flow rate of the second regulating structure increases, the liquid pressure entering the buffer tube 7 decreases, and under the action of the gravity of the gravity slider, the gravity slider 34 moves downward, pressing the liquid in the buffer tube 7 downward into the first annular cylinder 12, impacting and vibrating the liquid in the second liquid inlet pipe 9. At the same time, during the upward movement of the buffer tube 7, the bubbles in the liquid float upward, and the reciprocating vibration of the gravity slider 34 causes the liquid in the buffer tube 7 to vibrate continuously, crushing and dispersing the bubbles in the liquid, preventing the influence of bubbles on the casting. Reducing the defective rate of the casting and improving the casting quality.

[0085] Meanwhile, the liquid pressure entering the first liquid inlet pipe is constantly changing, and the liquid pressure will impact the liquid in the second liquid inlet pipe 9, so the liquid pressure entering the die cavity is also constantly changing. During the process of injecting the solution into the die cavity, the bubbles can be dispersed. Improving the casting quality.

[0086] When the liquid injection into the die 2 is about to be completed, rotate the rotating barrel 14 in the reverse direction. The rotating barrel 14 drives the pushing block 33 to rotate. When the pushing block 33 rotates, it drives the rectangular block 29 to slide reversely along the rectangular groove 28. Adjust the cross-sectional area of the liquid outlet channel 2701 to the minimum state. Subsequently, stop the pressure pump on the first liquid inlet pipe 8.

[0087] As the casting cools, due to the shrinkage of the casting volume during cooling, in this process, under the combined action of the gravity of the gravity slider 34 and the elastic force of the spring 35, or under the combined action of the gravity of the gravity slider 34 and the hydraulic oil pressure, the gravity slider 34 moves downward towards the casting, gradually pressing the liquid in the buffer tube 7 into the second liquid inlet pipe 9. The gravity slider 34 plays a pressure-holding role and replenishes the liquid at any time, further improving the casting quality.

[0088] After the casting is cooled, start the hydraulic cylinder 5 to extend, so that the punch 3 is separated from the die 2, and the casting can be taken out.

[0089] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aluminum alloy low-pressure casting device for an automotive crossbeam based on electromagnetic stirring, comprising a support table (1), a female mold (2), a male mold (3), an upper top plate (4), a hydraulic cylinder (5) and a first cylinder (6), characterized in that, The first barrel (6) is sleeved outside the female die (2) and fixedly connected to the support table (1). There is a gap between the first barrel (6) and the female die (2), and the gap between the first barrel (6) and the female die (2) forms a magnetic field chamber (601). An electromagnetic device is installed in the magnetic field chamber (601). A second liquid inlet pipe (9) is fixedly installed above the upper top plate (4). The lower end of the second liquid inlet pipe (9) penetrates downward through the male die (3). A buffer pipe (7) communicated with the second liquid inlet pipe (9) is installed above the second liquid inlet pipe (9). A gravity slider (34) is vertically slidably installed in the buffer pipe (7). A second barrel (13) is fixedly installed above the second liquid inlet pipe (9). A first liquid inlet pipe (8) communicated with the inner cavity of the second barrel (13) is installed on one side of the second barrel (13). A first flow rate regulating structure is installed between the first liquid inlet pipe (8) and the second liquid inlet pipe (9). A second flow rate regulating structure is installed at the lower end of the buffer pipe (7). The first flow rate regulating structure regulates the liquid flow rate entering the second liquid inlet pipe (9), and the second flow rate regulating structure regulates the liquid flow rate entering the buffer pipe (7). A first driving structure is installed between the first flow rate regulating structure and the second flow rate regulating structure. The first driving structure drives the first flow rate regulating structure and the second flow rate regulating structure to perform flow rate regulation according to opposite flow rate change trends.

2. The aluminum alloy low-pressure casting device for automobile crossbeam based on electromagnetic stirring according to claim 1, wherein: A first annular cylinder (12) is fixedly installed in the second barrel (13). The bottom of the first annular cylinder (12) is closed. There is a gap between the first annular cylinder (12) and the second barrel (13). There is a gap between the lower end of the first annular cylinder (12) and the bottom of the second barrel (13). The gap between the first annular cylinder (12) and the second barrel (13) and the gap between the lower end of the first annular cylinder (12) and the bottom of the second barrel (13) are communicated to form a liquid inlet chamber (1301). The first liquid inlet pipe (8) is communicated with the liquid inlet chamber (1301). A plurality of liquid outlet holes (1201) are circumferentially and evenly arranged on the first annular cylinder (12). The liquid outlet holes (1201) communicate the inner cavity of the first annular cylinder (12) with the liquid inlet chamber (1301). The upper end of the second liquid inlet pipe (9) is communicated with the inner cavity of the first annular cylinder (12). The first flow rate regulating structure is installed in the first annular cylinder (12).

3. The aluminum alloy low-pressure casting device for automobile crossbeam based on electromagnetic stirring according to claim 2, characterized in that: A rotating barrel (14) is rotatably installed above the second barrel (13). The rotating barrel (14) is rotatably connected to the buffer pipe (7). A fixed ring (31) located in the rotating barrel (14) is fixedly installed at the bottom of the buffer pipe (7). The second flow rate regulating structure is installed in the fixed ring (31). The second flow rate regulating structure communicates the buffer pipe (7) with the inner cavity of the first annular cylinder (12).

4. An aluminum alloy low-pressure casting device for an automotive crossbeam based on electromagnetic stirring according to claim 3, characterized in that: A rotating top cover (1401) is fixedly installed at the lower end of the rotating barrel (14). The rotating top cover (1401) is rotatably installed on the second barrel (13). The top wall of the rotating top cover (1401) is in contact with the top wall of the first annular cylinder (12). A liquid separation pipe (15) communicating with the inner cavity of the first annular cylinder (12) is fixedly installed on the rotating top cover (1401). The second flow rate regulating structure is located between the buffer pipe (7) and the liquid separation pipe (15).

5. A low-pressure casting device for aluminum alloy automotive crossbeam based on electromagnetic stirring according to claim 4, characterized in that: The first flow rate regulating structure includes: eccentric wheels (16). A plurality of the eccentric wheels (16) are provided and are circumferentially and evenly installed in the first annular cylinder (12). A vertical rotating shaft (17) is fixedly installed on the eccentric wheel (16). The upper end of the rotating shaft (17) penetrates through the top wall of the rotating top cover (1401) and is located in the rotating barrel (14) above the rotating top cover (1401). The rotating shaft (17) is rotatably connected to the top wall of the rotating top cover (1401). A motor is connected to one of the rotating shafts (17). Sprockets (18). A plurality of the sprockets (18) are provided and correspond to the rotating shafts (17) one by one. The sprockets (18) are fixedly installed on the corresponding rotating shafts (17). A chain (19) is sleeved outside the sprockets (18) and meshes with the sprockets (18) at the same time.

6. The aluminum alloy low-pressure casting device for automobile crossbeam based on electromagnetic stirring according to claim 5, characterized in that: The second flow rate regulating structure includes a fixed baffle (26). The cross-section of the fixed baffle (26) is trapezoidal. Six of the fixed baffles (26) are provided. The fixed baffles (26) are circumferentially and evenly arranged in the fixed ring (31). Adjacent fixed baffles (26) are in contact with each other. The six fixed baffles (26) form a structure with a regular hexagon cross-section. Rotating baffles (27). Six of the rotating baffles (27) are provided. The rotating baffles (27) are located inside the fixed baffles (26). The fixed baffles (26) are in contact with the rotating baffles (27), and adjacent rotating baffles (27) are in contact with each other. Three of the rotating baffles (27) are fixedly connected to the fixed baffles (26), and the other three rotating baffles (27) are rotatably connected to the fixed baffles (26). The rotating baffles (27) fixedly connected to the fixed baffles (26) and the rotating baffles (27) rotatably connected to the rotating baffles (27) are arranged at intervals. A rotating shaft (25) with an axis arranged horizontally is fixedly installed on each of the rotating baffles (27) rotatably connected to the fixed baffles (26). The end of the rotating shaft (25) far from the rotating baffle (27) passes through the corresponding fixed baffle (26) and is located outside the fixed baffle (26). A torsion spring (11) is installed between the rotating shaft (25) and the fixed baffle (26). The first driving structure is installed between the rotating shaft (17) and the rotating shaft (25). A connecting shaft (2501) with a horizontal axis is fixedly installed on each of the rotating baffles (27) fixedly connected to the fixed baffle (26). One end of the connecting shaft (2501) away from the rotating baffle (27) is fixedly connected to the corresponding fixed baffle (26) and is located outside the corresponding fixed baffle (26).

7. An aluminum alloy low-pressure casting device for an automotive crossbeam based on electromagnetic stirring according to claim 6, characterized in that: The first driving structure includes: an incomplete gear (20). There are three incomplete gears (20), and the incomplete gears (20) correspond to the rotating shafts (25) one by one. The incomplete gears (20) are fixedly connected to the rotating shaft (17). A cylindrical gear (21) is coaxially and fixedly installed on the corresponding rotating shaft (25). An L-shaped plate (22) is slidably connected to the fixed ring (31). The length direction of the L-shaped plate (22) is parallel to the side length direction of the regular hexagon formed by the fixed baffles (26). The L-shaped plate (22) includes a horizontal plate and a vertical plate which are perpendicular to each other. A second rack (24) is fixedly installed on the upper end surface of the horizontal plate. The second rack (24) meshes with the cylindrical gear (21). A first rack (23) is fixedly installed on the end surface of the vertical plate. The first rack (23) meshes with the incomplete gear (20).

8. An aluminum alloy low-pressure casting device for an automotive crossbeam based on electromagnetic stirring according to claim 6, characterized in that: Six guide plates (30) are evenly distributed on the inner circumference of the fixed ring (31). The guide plates (30) are connected end to end and are fixedly connected to the fixed ring (31). The six guide plates (30) form a regular hexagon, and the vertical section where the side of the regular hexagon formed by the guide plates (30) is located is parallel to the vertical section where the side of the regular hexagon formed by the fixed baffles (26) is located. A rectangular groove (28) parallel to the fixed baffle (26) is formed in each fixed baffle (26). A rectangular block (29) is fixedly installed on each rotating shaft (25) and each connecting shaft (2501). The rectangular block (29) is located in the rectangular groove (28) and is slidably connected to the rectangular groove (28).

9. The aluminum alloy low-pressure casting device for automotive crossbeam based on electromagnetic stirring according to claim 8, characterized in that: A plurality of pushing blocks (33) are evenly distributed on the inner wall of the rotating barrel (14) in a circumferential manner. The pushing blocks (33) correspond to the rectangular blocks (29) one by one. A plurality of arc-shaped grooves (32) are formed in the fixed ring (31). The arc-shaped grooves (32) correspond to the pushing blocks (33) one by one. The rectangular block (29) cooperates with the fixed ring (31). A plurality of set screws (10) are threadedly installed on the rotating top cover (1401). The set screws (10) penetrate through the side wall of the rotating top cover (1401) and abut against the outer wall of the second barrel (13).

10. A low-pressure casting device for aluminum alloy automotive cross beams based on electromagnetic stirring according to claim 1, characterized in that: The outer wall of the gravity slider (34) fits with the inner wall of the buffer tube (7). A spring (35) is installed in the buffer tube (7). One end of the spring (35) is fixed on the buffer tube (7), and the other end of the spring (35) is fixed on the gravity slider (34).

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