A magnesium alloy semi-solid slurry maker for cold chamber die casting machines

Abstract

The application discloses a magnesium alloy semi-solid slurry maker for a cold chamber die casting machine and relates to the technical field of slurry maker equipment. The translation mechanism is used for horizontal sliding alignment of the whole machine to the cold chamber die casting machine, and the lifting adjusting mechanism is used for bearing the upper slurry making unit and realizing height adjustment and operation damping buffering. The hollow screw rod is driven by a driving motor to continuously rotate with the surface screw shearing piece, so that the magnesium alloy melt dendrite is sheared and spheroidized. The screw rod center through hole is independently provided with a pushing rod, which relies on the linear reciprocating motion of the driving pushing rod to realize quantitative feeding by extruding and pressing the semi-solid slurry in the stable discharging cylinder through the front end blocking block and the arc-shaped bottom block. The rotating slurry making and storage pushing can be synchronously carried out, the production continuity is high, the blocking block is matched with the slurry making cylinder inner diameter, the arc-shaped bottom block is matched with the stable discharging cylinder inner wall, the quantitative precision is high, and the casting weight fluctuation is reduced.

Description

Technical Field

[0001] This invention relates to the field of pulping equipment technology, specifically to a magnesium alloy semi-solid pulping machine for use in a cold chamber die casting machine. Background Technology

[0002] Cold chamber die casting is the mainstream process for the mass production of magnesium alloy parts. The semi-solid slurry die casting process can significantly reduce the pouring temperature, break dendrites to form spherical grain slurry, and fill the mold smoothly, which can effectively improve the airtightness and mechanical properties of the castings.

[0003] Currently available magnesium alloy semi-solid pulping equipment still has the following drawbacks: First, existing pulping equipment uses multiple independent power sources to drive the pulping, pushing, and feeding purging actions, resulting in a cumbersome transmission structure, high operating costs, and poor synchronization. Second, traditional pulping equipment lacks an integrated insulation and purging structure for the feeding square tube, making the feeding channel prone to blockage, causing severe oxidation and burning of magnesium alloy, poor production continuity, and failing to solve the problems of feeding blockage and magnesium liquid oxidation.

[0004] Therefore, this invention proposes a magnesium alloy semi-solid pulping machine for cold chamber die casting machines. Summary of the Invention

[0005] The purpose of this invention is to provide a magnesium alloy semi-solid pulping machine for cold chamber die casting machines, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a magnesium alloy semi-solid slurry preparation machine for a cold chamber die casting machine, comprising a translation mechanism, a lifting and adjusting mechanism, a slurry preparation mechanism, and a pushing mechanism; the translation mechanism is used for horizontal sliding and positioning of the entire machine in the cold chamber die casting machine; the lifting and adjusting mechanism is used for supporting the upper slurry preparation unit and realizing height adjustment and vibration damping during operation; the slurry preparation mechanism is used for shearing and breaking dendrites in the magnesium alloy melt and preparing a uniform semi-solid slurry; and the pushing mechanism is used for coaxially and quantitatively pushing the semi-solid slurry to the pressure chamber of the die casting machine.

[0007] The translation mechanism includes a slide rail base, on the upper surface of which a horizontally movable translation frame is slidably mounted. The translation frame slides along the slide rail base to allow the entire machine to move closer to or away from the die-casting machine. The lifting and adjusting mechanism includes four sleeve assemblies fixedly mounted on the upper surface of the translation frame. A top plate is fixedly connected to the top of the four sleeve assemblies, and the top plate serves as a support platform for all upper slurry making and pushing components. The slurry making mechanism includes a fixed seat mounted on the upper surface of the top plate. The fixed seat has mounting holes on its side, and a slurry making cylinder is fixedly inserted into the inner wall of the mounting holes. The slurry making cylinder is a sealed cavity for melt shearing and slurry making. A hollow screw is coaxially rotatably mounted on the inner wall of the slurry making cylinder. The hollow screw provides both a rotating shearing channel and a pushing rod passage channel. A spiral shearing blade is fixedly mounted on the surface of the hollow screw. The spiral shearing blade continuously stirs and shears the primary dendrites of the magnesium alloy melt.

[0008] The feeding mechanism includes a feeding rod slidably mounted on the inner wall of a hollow screw. The feeding rod reciprocates linearly along the axial direction of the hollow screw to push the slurry. A pressure-stabilizing discharge cylinder is fixedly installed at the left end of the hollow screw. The inside of the pressure-stabilizing discharge cylinder is a pressure-stabilizing storage chamber, which is used to buffer homogeneous semi-solid slurry and stabilize the discharge pressure. One end of the feeding rod extends into the inside of the pressure-stabilizing discharge cylinder and is fixedly installed with a sealing block. The sealing block is used to squeeze the slurry and prevent slurry backflow. An arc-shaped bottom block is fixedly installed at the bottom of the sealing block. The arc-shaped bottom block fits against the inner wall of the pressure-stabilizing storage chamber to eliminate the feeding dead angle.

[0009] Preferably, the size of the sealing block matches the inner diameter of the slurry cylinder to ensure that the slurry flows back without gaps during the feeding process. The bottom of the arc-shaped bottom block is slidably connected to the inner wall of the pressure-stabilizing discharge cylinder. The arc-shaped structure is adapted to the arc-shaped bottom surface of the pressure-stabilizing storage cavity to avoid slurry residue clumping. The discharge end of the pressure-stabilizing discharge cylinder is connected to the slurry feeding nozzle, and the slurry is then transported into the cold chamber die-casting machine through the feeding nozzle to achieve stable casting of sealed low-temperature slurry.

[0010] Preferably, the end of the push rod away from the pressure-stabilizing discharge cylinder extends to the outside of the hollow screw, and is used to connect to an external reciprocating drive component to transmit linear thrust. The end of the hollow screw away from the pressure-stabilizing discharge cylinder extends to the outside of the pulping cylinder, and is used to connect to an external rotary transmission component to obtain shearing rotational power, so as to realize the rotation of the hollow screw and the linear movement of the push rod.

[0011] Preferably, a drive motor is fixedly installed on the left side of the fixed base. The drive motor provides the only active power source for the whole machine and synchronously outputs rotational torque for pulping and purging linkage. The output end of the drive motor is fixedly connected to a drive shaft, which synchronously transmits two rotational powers. A drive gear is fixedly connected to the surface of the drive shaft, and a driven gear is fixedly installed on the surface of the hollow screw. The drive gear meshes with the driven gear, and the torque is amplified through gear meshing to drive the hollow screw to rotate stably and shear the melt.

[0012] Preferably, the pushing mechanism further includes a longitudinal shaft rotatably mounted on the upper surface of the top plate. The longitudinal shaft realizes 90° power reversal transmission. A first bevel gear is fixedly mounted at the top end of the longitudinal shaft, and a second bevel gear is fixedly mounted at the end of the drive shaft away from the drive motor. The position of the first bevel gear corresponds to that of the second bevel gear, and the first bevel gear meshes with the second bevel gear, converting the horizontal rotational power into the vertical rotational power of the longitudinal shaft, so as to realize the synchronous drive of the single motor to pulping, pushing, and purging actions.

[0013] Preferably, a linkage turntable is fixedly installed at the top of the longitudinal shaft. The linkage turntable converts continuous rotation into eccentric reciprocating motion. A horizontal movable rod is rotatably installed on the upper surface of the linkage turntable. The horizontal movable rod transmits eccentric reciprocating displacement. A limiting vertical plate is fixedly installed on the upper surface of the top plate. The limiting vertical plate is used to fix the corrugated compressed air cylinder and limit the travel of the reciprocating push plate. A corrugated compressed air cylinder is fixedly installed on the right side of the limiting vertical plate. The corrugated compressed air cylinder compresses and generates purging protective gas by mechanical reciprocating motion. A reciprocating push plate is fixedly connected to the right end of the corrugated compressed air cylinder. The reciprocating push plate is located between the push rod and the horizontal movable rod, and synchronously drives the push rod to push linearly and compress the air cylinder to generate gas. The right end of the push rod is fixedly connected to the left side of the reciprocating push plate. A rotating seat is fixedly installed on the right side of the reciprocating push plate. The left end of the horizontal movable rod is rotatably connected to the lower surface of the rotating seat. The hinge structure compensates for the angular offset caused by the eccentric motion of the turntable and avoids the mechanism from jamming.

[0014] Preferably, a feed square tube is fixedly embedded on the upper surface of the right end of the pulping cylinder. The feed square tube serves as a gravity-fed feeding channel for the magnesium alloy melt. The melt only flows into the annular cavity between the screw and the cylinder and does not enter the interior of the hollow screw, preventing the magnesium melt from enveloping and jamming the push rod. An air blowing component is provided on the surface of the feed square tube. The air blowing component is used to blow away the residual magnesium melt on the inner wall of the feed square tube, isolate the air from contact with the high-temperature magnesium melt, and prevent the formation of oxide clumps on the inner wall of the feed square tube, thus blocking the feeding channel.

[0015] Preferably, the blowing assembly includes an annular heating sleeve fixedly fitted around the feed square tube. The annular heating sleeve completely encloses the feed pipe to achieve all-round constant temperature insulation. Several electric heating tubes are fixedly installed on the inner wall of the annular heating sleeve. The electric heating tubes continuously supply heat to prevent the magnesium liquid on the pipe wall from solidifying at low temperature. A strip-shaped air nozzle is fixedly embedded in the inner wall of the feed square tube. The air inlet end of the strip-shaped air nozzle extends into the interior of the annular heating sleeve, and the air outlet of the strip-shaped air nozzle corresponds to the inner wall of the feed square tube, forming a uniform blowing airflow along the pipe wall. The output end of the corrugated compressor is fixedly connected to a gas guide hose. The end of the gas guide hose away from the corrugated compressor extends into the interior of the annular heating sleeve to deliver compressed protective gas to the air nozzle. An air inlet pipe is fixedly provided at the air inlet end of the corrugated compressor. A one-way air inlet valve is provided at the air inlet of the air inlet pipe. The one-way valve only allows the inert protective gas to be drawn in one direction to prevent the high-temperature magnesium gas from backflowing and damaging the air cylinder.

[0016] Preferably, the sleeve assembly includes a support sleeve and a telescopic rod. The telescopic rod is slidably disposed on the inner wall of the support sleeve. A support spring is fixedly installed at the bottom end of the telescopic rod and the inner bottom wall of the support sleeve. The support spring absorbs the equipment vibration generated by the rotation of the screw and the reciprocating of the pusher, reduces the cylinder offset and seal wear, and plays a shock absorption and buffering role.

[0017] Preferably, the lifting adjustment mechanism further includes two hydraulic push rods fixedly installed at the bottom of the translation frame. The hydraulic push rods provide active lifting power. The telescopic ends of the hydraulic push rods extend to the top of the translation frame and are fixedly connected to the lower surface of the top plate. The overall lifting is driven by the extension and retraction of the push rods, which can quickly adjust the height of the slurry cylinder and the slurry nozzle to adapt to the feeding height of the pressure chamber of cold chamber die casting machines of different tonnages.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The equipment adopts a coaxial layout with a hollow screw and an internal pusher rod. The drive motor drives the hollow screw and the surface spiral shear blades to rotate continuously, completing the dendrite shearing and spheroidization of magnesium alloy melt. The pusher rod is independently installed through the central through hole of the screw. Relying on the linear reciprocating motion of the pusher rod, the front sealing block and the arc-shaped bottom block squeeze the semi-solid slurry in the pressure-stabilizing discharge cylinder to achieve quantitative feeding. Rotary slurry making and material storage and pushing can be carried out simultaneously, resulting in strong production continuity. The sealing block matches the inner diameter of the slurry cylinder, and the arc-shaped bottom block fits the inner wall of the pressure-stabilizing discharge cylinder, so there are no dead corners in the pushing and no slurry backflow. The quantitative accuracy is high, reducing the weight fluctuation of the castings.

[0020] 2. The feed square tube integrates a blowing and heating component to prevent material blockage and oxidation at the feed inlet, reducing magnesium alloy burn-off. The feed square tube is located above the tail end of the pulping cylinder, ensuring that the melt flows only within the annular cavity between the outer wall of the hollow screw and the inner wall of the pulping cylinder, without entering the central through hole of the screw, thus preventing the magnesium liquid from enveloping the push rod and causing jamming. An annular heating sleeve and electric heating tube are installed around the feed square tube for continuous heat preservation, preventing the magnesium liquid from solidifying and clumping at low temperatures. A corrugated compressed air cylinder delivers protective gas to the strip-shaped jet nozzle through a flexible air guide tube. After each feeding, residual magnesium liquid on the tube wall is automatically purged, isolating air and significantly reducing magnesium oxidation and spontaneous combustion, thus improving production safety.

[0021] 3. The drive motor drives the hollow screw to rotate and pulp, and at the same time drives the longitudinal shaft and the linkage turntable to rotate through the bevel gear combination. In conjunction with the horizontal movable rod, it synchronously drives the corrugated compressed air cylinder to output the purging air source. One set of motor power supplies the pulping, stirring and feeding purging functions at the same time, eliminating the need for a separate purging drive source, simplifying the transmission structure of the whole machine, reducing the number of power components such as motors and cylinders, and reducing the equipment manufacturing cost and the amount of maintenance work in the later stage.

[0022] 4. The spiral shear blades inside the slurry cylinder continuously shear and break down dendrites in the melt. The slurry enters the front-end pressure-stabilizing discharge cylinder for buffering and homogenization. After being pushed and squeezed, it is smoothly fed from the slurry nozzle into the cold chamber pressure chamber. There is no violent turbulence during filling, which greatly reduces the porosity and shrinkage defects of the casting. The temperature fluctuation of the semi-solid slurry is small, and the thermal shock of the mold and cold chamber is smaller, which effectively extends the service life of the die-casting mold and the cold chamber bushing. Attached Figure Description

[0023] Figure 1 This is a front view structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the pulping mechanism of the present invention;

[0026] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0027] Figure 5 This is a rear view schematic diagram of the lifting and adjusting mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the front section structure of the air blowing assembly of the present invention;

[0029] Figure 7 This is a schematic diagram of the front section structure of the feeding mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the front section structure of the sleeve assembly of the present invention;

[0031] In the diagram: 1. Translation mechanism; 2. Lifting and adjusting mechanism; 3. Pulping mechanism; 4. Pushing mechanism; 5. Air blowing assembly;

[0032] 101. Slide rail base; 102. Translation frame;

[0033] 201. Top plate; 20. Sleeve assembly; 2001. Support sleeve; 2002. Telescopic rod; 2003. Support spring; 202. Hydraulic push rod;

[0034] 301. Fixed base; 302. Pulping cylinder; 303. Hollow screw; 304. Spiral shear blade; 305. Pressure-stabilizing discharge cylinder; 306. Drive motor; 307. Drive shaft; 308. Drive gear; 309. Driven gear; 310. Feed square tube;

[0035] 401. Push rod; 402. Sealing block; 403. Arc-shaped bottom block; 404. Longitudinal shaft; 405. First bevel gear; 406. Second bevel gear; 407. Linkage turntable; 408. Horizontal movable rod; 409. Limiting vertical plate; 410. Corrugated compressed air cylinder; 411. Reciprocating push plate; 412. Rotating seat;

[0036] 501. Annular heating jacket; 502. Strip-shaped jet nozzle; 503. Air guide hose; 504. Electric heating tube. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-8 The present invention provides a technical solution: a magnesium alloy semi-solid slurry making machine for cold chamber die casting machine. The whole machine is mainly composed of a translation mechanism 1, a lifting adjustment mechanism 2, a slurry making mechanism 3, a pushing mechanism 4 and an air blowing component 5. The whole machine relies on the bottom translation mechanism 1 to realize the horizontal displacement of the whole machine. The pushing mechanism 4 is coaxially matched to realize the quantitative pushing of semi-solid slurry. The air blowing component 5 is integrated into the feeding part.

[0039] The translation mechanism 1 includes a slide rail base 101 and a translation frame 102. The slide rail base 101 is fixedly laid on the ground. A linear sliding guide rail is machined on the upper surface of the slide rail base 101. The bottom of the translation frame 102 is matched with the guide rail structure and slidably assembled. The translation frame 102 can slide horizontally back and forth along the slide rail base 101 to realize the whole machine moving towards the cold chamber die casting machine and moving backward for alignment.

[0040] In actual production, simply drive the translation frame 102 to slide along the slide rail base 101 to quickly align the slurry nozzle of the front pressure stabilizing discharge cylinder 305 with the feed port of the die casting machine pressure chamber. No manual hoisting and adjustment of the equipment is required, which greatly reduces the time required for equipment alignment and calibration.

[0041] The lifting and adjusting mechanism 2 is integrally installed and fixed on the upper surface of the translation frame 102, and includes four sets of sleeve assemblies 20, a top plate 201, and two sets of hydraulic push rods 202. The four sets of sleeve assemblies 20 are evenly distributed at the four corners of the translation frame 102. Each sleeve assembly 20 consists of a support sleeve 2001, a telescopic rod 2002, and a support spring 2003. The bottom end of the support sleeve 2001 is welded and fixed to the top surface of the translation frame 102. The telescopic rod 2002 is slidably nested inside the support sleeve 2001. The support spring 2003 is installed between the lower end of the telescopic rod 2002 and the inner bottom wall of the support sleeve 2001. The top ends of the four telescopic rods 2002 are rigidly connected to the top plate 201. The two sets of hydraulic push rods 202 are vertically fixedly installed at the bottom of the translation frame 102. The telescopic ends of the hydraulic push rods 202 extend upward through the translation frame 102 and are tightly connected to the lower surface of the top plate 201.

[0042] The equipment height adjustment process involves activating the hydraulic push rod 202. The telescopic end of the hydraulic push rod 202 pushes the top plate 201 upward or pulls the top plate 201 downward. The top plate 201 simultaneously drives the four telescopic rods 2002 to slide synchronously inside the support sleeve 2001. The support spring 2003 follows the telescopic rods 2002 in compression or extension.

[0043] It is worth noting that the hydraulic push rod 202 provides active lifting power, which can precisely adjust the overall height of the top plate 201 and the entire pulping mechanism 3 and the pushing mechanism 4 above it. It is compatible with the feed inlet of the pressure chamber of cold chamber die casting machine with different height specifications, greatly improving the equipment's versatility. One pulping device can be adapted to the full range of cold chamber die casting machines from 500T to 3500T. The support spring 2003 inside the sleeve assembly 20 forms an elastic buffer support. The vibration generated by the high-speed rotation of the hollow screw 303 and the reciprocating linear motion of the pushing rod 401 will be transmitted to the telescopic rod 2002 through the top plate 201. The support spring 2003 absorbs most of the vibration energy, reducing the problems of cylinder displacement, seal wear, and pulp nozzle misalignment caused by vibration, extending the service life of the pulping cylinder 302, various transmission gears, and seals, and reducing the frequency of abnormal noise and machine downtime.

[0044] The pulping mechanism 3 is installed on the upper surface of the top plate 201, including the fixing seat 301 and the pulping cylinder 302. The fixing seat 301 is bolted and fixed above the top plate 201. A transverse through mounting hole is opened on the side of the fixing seat 301. The pulping cylinder 302 is horizontally inserted into the mounting hole and locked and positioned. The pulping cylinder 302 is a horizontal cylindrical structure with through ends on both sides. A hollow screw 303 is coaxially assembled inside the pulping cylinder 302. The hollow screw 303 is a hollow shaft structure. Multiple sets of spiral shearing blades 304 are integrally welded to the outer circular surface of the hollow screw 303. The spiral shearing blades 304 are arranged with varying pitch along the axial direction and are used to shear and break the primary dendrites of the magnesium alloy melt.

[0045] The left end of the hollow screw 303 extends outward from the outside of the pulping cylinder 302. The left end face of the hollow screw 303 is fixedly connected to the pressure-stabilizing discharge cylinder 305. The inside of the pressure-stabilizing discharge cylinder 305 is hollow, forming a pressure-stabilizing storage chamber. The leftmost discharge port of the pressure-stabilizing discharge cylinder 305 is connected to a telescopic heat-insulating pulp delivery nozzle. The right end of the hollow screw 303 also extends outward to the outside of the pulping cylinder 302. The driven gear 309 is fixedly mounted on the outer wall of the right end of the hollow screw 303.

[0046] A drive motor 306 is horizontally fixedly installed on the outer right side of the fixed base 301. The output shaft of the drive motor 306 is coaxially connected to the drive shaft 307. A drive gear 308 is fixedly assembled in the middle section of the drive shaft 307. The drive gear 308 and the driven gear 309 mesh with each other for transmission. One end of the drive shaft 307 away from the drive motor 306 extends out, and a second bevel gear 406 is fixedly installed at the end.

[0047] A vertical opening is made on the upper right side of the tail of the pulping cylinder 302. A feed square tube 310 is sealed and embedded at the opening. The upper end of the feed square tube 310 is connected to the bottom self-flow valve of the molten material crucible. The liquid magnesium alloy flows into the annular cavity inside the pulping cylinder 302 by its own weight. This annular cavity is the gap between the inner wall of the pulping cylinder 302 and the outer wall of the hollow screw 303. The magnesium alloy melt is only transported forward in this area and will not enter the central through hole of the hollow screw 303.

[0048] It is worth noting that the hollow screw 303 is independently driven by gear meshing. The torque output by the drive motor 306 is amplified by the drive gear 308 and the driven gear 309 to drive the hollow screw 303 to rotate stably. The spiral shear blade 304 continuously stirs and shears the magnesium alloy melt flowing through the annular cavity. Under the shearing action, the primary dendrites of the high-temperature liquid magnesium alloy are broken down and gradually form spherical primary magnesium grains, which are transformed into a uniform semi-solid slurry. The grain size of the slurry is uniform, and the subsequent die casting filling is stable, and the porosity and shrinkage defects of the casting are greatly reduced.

[0049] The feed square tube 310 is arranged above the tail of the pulping cylinder 302, and the melt completely avoids the central channel of the hollow screw 303, preventing the molten magnesium liquid from seeping into the screw and wrapping the pusher rod 401, preventing the magnesium liquid from solidifying and locking the pusher rod 401 under alternating high and low temperatures, and reducing the failure of the pusher mechanism 4 to jam.

[0050] An independent pressure-stabilizing discharge cylinder 305 is added at the front end. The semi-solid slurry after shearing and spheroidizing is uniformly collected in the pressure-stabilizing storage chamber for buffering and homogenization. The slurry pressure and temperature tend to be consistent, ensuring that the solid fraction and weight of the slurry pushed to the die casting machine are stable each time, and the batch consistency of casting size and mechanical properties is significantly improved.

[0051] The pushing mechanism 4 is a coaxial built-in reciprocating pushing structure, including a pushing rod 401. The pushing rod 401 is slidably assembled inside the central through hole of the hollow screw 303. The left end of the pushing rod 401 extends forward into the pressure-stabilizing storage chamber of the pressure-stabilizing discharge cylinder 305. A sealing block 402 is fixedly installed at the left end of the pushing rod 401. The outer diameter of the sealing block 402 is completely matched with the inner diameter of the pulping cylinder 302. The lower end of the sealing block 402 is integrally fixed with an arc-shaped bottom block 403. The lower surface of the arc-shaped bottom block 403 slides and fits against the arc surface of the inner wall of the pressure-stabilizing discharge cylinder 305. The right end of the pushing rod 401 extends backward through the hollow screw 303 and the pulping cylinder 302, and is finally rigidly fixed to the left end face of the reciprocating push plate 411.

[0052] A longitudinal shaft 404 is vertically rotatably mounted on the upper surface of the top plate 201. A first bevel gear 405 is fixed at the top of the longitudinal shaft 404. The first bevel gear 405 meshes perpendicularly with the second bevel gear 406 at the end of the drive shaft rod 307 to form a 90-degree reversing transmission structure. A linkage turntable 407 is fixed at the uppermost end of the longitudinal shaft 404. The right end of the horizontal movable rod 408 is rotatably connected to the eccentric position of the turntable 407.

[0053] A vertically fixed limiting plate 409 is fixed on the right side of the top plate 201. A corrugated compressed air cylinder 410 is fixed on the left side wall of the limiting plate 409. The corrugated compressed air cylinder 410 is horizontally arranged, and its telescopic output end is connected to a reciprocating push plate 411. A rotating seat 412 is welded to the right side of the reciprocating push plate 411. The left end of the horizontal movable rod 408 is hinged to the lower surface of the rotating seat 412 for rotation. An air inlet pipe with a one-way air inlet valve is connected to the air inlet end of the corrugated compressed air cylinder 410, and the air outlet end is connected to a guide hose 503 leading to the air blowing assembly 5.

[0054] After the drive motor 306 starts, the drive shaft 307 rotates synchronously. On the one hand, the drive gear 308 drives the hollow screw 303 to rotate and make pulp; on the other hand, the second bevel gear 406 meshes with the first bevel gear 405 to drive the longitudinal shaft 404 and the linkage turntable 407 to rotate synchronously. The eccentrically arranged linkage turntable 407 pulls the horizontal movable rod 408 to make eccentric reciprocating swing. The horizontal movable rod 408 pushes and pulls the rotating seat 412 and the reciprocating push plate 411 to move horizontally back and forth. The reciprocating push plate 411 synchronously drives the push rod 401 to slide back and forth in the inner hole of the hollow screw 303 to complete the pulp pushing action. At the same time, during the reciprocating motion of the reciprocating push plate 411, it will periodically compress and stretch the corrugated compressor cylinder 410. After the gas inside the corrugated compressor cylinder 410 is compressed, it is transported to the air blowing assembly 5 along the air guide hose 503 to complete the purging operation.

[0055] It is worth noting that the rotary motion of the hollow screw 303 and the linear reciprocating motion of the push rod 401 are completely decoupled. The two sets of motion share a single drive motor 306 power source, eliminating the need for additional push servo motors and independent purging air pumps. This significantly reduces the number of power components in the whole machine, lowering equipment procurement costs and subsequent electrical maintenance workload.

[0056] The sealing block 402 matches the inner diameter of the cylinder, and the arc-shaped bottom block 403 fits against the arc-shaped inner wall of the pressure-stabilizing discharge cylinder 305. When the push rod 401 pushes forward, there are no dead corners or gaps with residual slurry, and the slurry will not flow back into the slurry cylinder 302. The quantitative accuracy of the single feeding weight is high, and the weight deviation of the casting is greatly reduced. When the push rod 401 retracts and resets, the sealing block 402 disengages from the rear end of the pressure-stabilizing discharge cylinder 305, and the newly prepared semi-solid slurry in the slurry cylinder 302 can flow smoothly into the pressure-stabilizing storage chamber to complete the buffering.

[0057] The mechanical linkage synchronously realizes the three actions of pulping, feeding and blowing. The timing of the three actions is automatically matched. After the feeding is completed, the blowing is automatically started. The pulp pushing action is synchronized with the screw shearing. The equipment has a high degree of automation and does not require manual step-by-step operation, reducing the number of operators required on the production line.

[0058] The 410 corrugated air compressor relies on mechanical reciprocating motion to achieve gas pressurization output, eliminating the need for an external high-pressure air source. This results in fewer pipelines on-site, a cleaner workshop layout, and reduced safety hazards such as high-pressure air pipe leakage and explosion.

[0059] The air blowing assembly 5 is installed outside the feed square tube 310 and includes an annular heating sleeve 501, strip-shaped air nozzles 502, air guide hoses 503, and electric heating tubes 504. The annular heating sleeve 501 is completely wrapped and fixed to the outer wall of the feed square tube 310. Multiple electric heating tubes 504 are arranged around the inner cavity of the annular heating sleeve 501 to continuously heat and keep the feed square tube 310 at a constant temperature. Multiple sets of strip-shaped air nozzles 502 are embedded and fixed in the inner wall of the feed square tube 310. The air inlet channel of the strip-shaped air nozzles 502 extends through the tube wall of the feed square tube 310 to the inner cavity of the annular heating sleeve 501. The output end of the corrugated compressed air cylinder 410 is connected to the air guide hose 503. The other end of the air guide hose 503 is connected to the inside of the annular heating sleeve 501 and communicates with the air passage of the strip-shaped air nozzles 502.

[0060] The annular heating jacket 501 and the built-in electric heating tube 504 continuously provide all-round insulation for the feed square tube 310, preventing the magnesium liquid on the inner wall of the feed pipe from solidifying and clogging the feed channel in advance under low temperature conditions, ensuring continuous and stable feeding of magnesium alloy melt, and reducing the frequency of equipment shutdown to clear the feed port.

[0061] The inert protective gas output from the corrugated compressed air cylinder 410 is delivered to the strip-shaped jet nozzle 502 through the air guide hose 503. The strip-shaped airflow is evenly blown along the inner wall of the feed square tube 310. After each feeding stop, the residual magnesium liquid on the tube wall is automatically blown away, isolating the air from contact with the high-temperature magnesium liquid, greatly reducing the oxidation and burning loss of magnesium alloy, reducing environmental protection treatment costs, and eliminating the risk of spontaneous combustion of magnesium liquid at the feed inlet, thereby improving the safety level of the die casting production line.

[0062] Working principle: Before the equipment is started, the translation frame 102 of the translation mechanism 1 slides along the slide rail base 101 to move the whole machine to the side of the cold chamber die casting machine, so that the front end of the pressure stabilizing discharge cylinder 305 is aligned with the pressure chamber inlet; the hydraulic push rod 202 is started to drive the top plate 201 to rise and fall, and the support spring 2003 of the sleeve assembly 20 buffers and dampens the shock, and the height of the cylinder 302 is finely adjusted to ensure that the discharge nozzle is coaxial with the pressure chamber inlet. After the alignment is completed, the translation frame 102 is locked.

[0063] The drive motor 306 is started, and the drive shaft 307 rotates synchronously. One power source drives the hollow screw 303 to rotate continuously through the meshing of the drive gear 308 and the driven gear 309. The spiral shear blade 304 rotates synchronously. Molten magnesium alloy flows from the crucible into the feed square tube 310 and into the annular cavity between the slurry cylinder 302 and the hollow screw 303. The rotating spiral shear blade 304 continuously shears and stirs the melt, breaking the dendritic structure and gradually forming a semi-solid magnesium alloy slurry with a uniform solid phase. The slurry continues to flow forward and gathers in the pressure-stabilized storage cavity inside the pressure-stabilized discharge cylinder 305 for buffering and homogenization.

[0064] The second bevel gear 406 at the other end of the drive shaft 307 synchronously meshes with the first bevel gear 405, driving the longitudinal shaft 404 and the linkage turntable 407 to rotate at a constant speed. The eccentrically mounted linkage turntable 407 pulls the horizontal movable rod 408 to swing back and forth, pushing the reciprocating push plate 411 to move horizontally back and forth. On the one hand, the reciprocating push plate 411 drives the push rod 401 to slide back and forth along the inner hole of the hollow screw 303. The front end sealing block 402 and the arc-shaped bottom block 403 of the push rod 401 periodically squeeze and stabilize the slurry inside the discharge cylinder 305, pushing the semi-solid slurry forward. The slurry is fed through the front end. The slurry nozzle is fed into the pressure chamber of the cold chamber die-casting machine at a uniform speed to complete one quantitative feeding. After the push rod 401 retracts and resets, the new slurry in the slurry cylinder 302 is continuously replenished to the pressure-stabilizing storage chamber, and the slurry feeding is circulated. On the other hand, when the reciprocating push plate 411 moves back and forth, it periodically compresses and stretches the corrugated compressor cylinder 410. The corrugated compressor cylinder 410 draws in inert protective gas and pressurizes and outputs it. The gas is passed into the interior of the annular heating jacket 501 along the air guide hose 503 and finally sprayed out by the strip-shaped air nozzle 502 to continuously blow away the residual magnesium liquid on the inner wall of the feed square tube 310 to prevent the magnesium liquid on the tube wall from solidifying and agglomerating.

Claims

1. A magnesium alloy semi-solid pulping machine for use in a cold chamber die casting machine, characterized in that, It includes a translation mechanism (1), a lifting and adjusting mechanism (2), a slurry making mechanism (3), and a pushing mechanism (4); the translation mechanism (1) is used for horizontal sliding and positioning of the whole machine in the cold chamber of the die casting machine; the lifting and adjusting mechanism (2) is used to support the upper slurry making unit and realize height adjustment and shock absorption during operation; the slurry making mechanism (3) is used for shearing and breaking dendrites of magnesium alloy melt and preparing uniform semi-solid slurry; and the pushing mechanism (4) is used for coaxially and quantitatively pushing semi-solid slurry to the pressure chamber of the die casting machine. The translation mechanism (1) includes a slide rail base (101), on the upper surface of which a horizontally movable translation frame (102) is slidably mounted. The translation frame (102) slides along the slide rail base (101) to allow the whole machine to move closer to or further away from the die-casting machine. The lifting adjustment mechanism (2) includes four sleeve assemblies (20) fixedly mounted on the upper surface of the translation frame (102). The top of the four sleeve assemblies (20) is fixedly connected to a top plate (201), which serves as a support platform for all upper pulping and pushing components. The pulping mechanism (3) includes components mounted on the top plate. (201) The upper surface of the fixed seat (301) has a mounting hole on its side. The inner wall of the mounting hole is fixedly inserted with a pulping cylinder (302). The pulping cylinder (302) is a closed cavity for melt shearing and pulping. The inner wall of the pulping cylinder (302) is coaxially rotatably provided with a hollow screw (303). The hollow screw (303) provides both a rotating shearing channel and a push rod (401) passage channel. The surface of the hollow screw (303) is fixedly provided with a spiral shearing blade (304). The spiral shearing blade (304) continuously stirs and shears the primary dendrites of the magnesium alloy melt. The pushing mechanism (4) includes a pushing rod (401) slidably mounted on the inner wall of the hollow screw (303). The pushing rod (401) moves back and forth linearly along the axial direction of the hollow screw (303) to push the slurry. A pressure-stabilizing discharge cylinder (305) is fixedly installed at the left end of the hollow screw (303). The inside of the pressure-stabilizing discharge cylinder (305) is a pressure-stabilizing storage chamber, which is used to buffer homogeneous semi-solid slurry and stabilize the discharge pressure. One end of the pushing rod (401) extends into the inside of the pressure-stabilizing discharge cylinder (305) and is fixedly installed with a blocking block (402). The blocking block (402) is used to squeeze the slurry and prevent the slurry from flowing back. An arc-shaped bottom block (403) is fixedly installed at the bottom of the blocking block (402). The arc-shaped bottom block (403) fits against the inner wall of the pressure-stabilizing storage chamber to eliminate the pushing dead angle.

2. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 1, characterized in that: The size of the sealing block (402) matches the inner diameter of the slurry cylinder (302) to ensure that the slurry flows back without gaps when pushing the material. The bottom of the arc-shaped bottom block (403) is slidably connected to the inner wall of the pressure-stabilizing discharge cylinder (305). The arc structure is adapted to the arc bottom surface of the pressure-stabilizing storage cavity to avoid slurry residue clumping. The discharge end of the pressure-stabilizing discharge cylinder (305) is connected to the slurry feeding nozzle, and then the slurry is transported into the cold chamber die-casting machine through the feeding nozzle to achieve stable casting of sealed low-temperature slurry.

3. A magnesium alloy semi-solid pulping machine for a cold chamber die-casting machine according to claim 2, characterized in that: The push rod (401) extends from the end away from the pressure-stabilizing discharge cylinder (305) to the outside of the hollow screw (303) for connecting to an external reciprocating drive component to transmit linear thrust. The hollow screw (303) extends from the end away from the pressure-stabilizing discharge cylinder (305) to the outside of the pulping cylinder (302) for connecting to an external rotary transmission component to obtain shearing rotational power, thereby realizing the rotation of the hollow screw (303) and the linear movement of the push rod (401).

4. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 3, characterized in that: A drive motor (306) is fixedly installed on the left side of the fixed base (301). The drive motor (306) provides the only active power source for the whole machine and synchronously outputs rotational torque for pulping and purging linkage. The output end of the drive motor (306) is fixedly connected to a drive shaft (307). The drive shaft (307) synchronously transmits two rotational powers. A drive gear (308) is fixedly connected to the surface of the drive shaft (307). A driven gear (309) is fixedly installed on the surface of the hollow screw (303). The drive gear (308) meshes with the driven gear (309). Through gear meshing, the torque is amplified to drive the hollow screw (303) to rotate stably and shear the melt.

5. A magnesium alloy semi-solid pulping machine for a cold chamber die-casting machine according to claim 4, characterized in that: The feeding mechanism (4) also includes a longitudinal shaft (404) rotatably mounted on the upper surface of the top plate (201). The longitudinal shaft (404) realizes a 90° reversal transmission of power. A first bevel gear (405) is fixedly mounted at the top of the longitudinal shaft (404). A second bevel gear (406) is fixedly mounted at the end of the drive shaft (307) away from the drive motor (306). The position of the first bevel gear (405) corresponds to that of the second bevel gear (406), and the first bevel gear (405) meshes with the second bevel gear (406) to convert the horizontal rotational power into the vertical rotational power of the longitudinal shaft (404), thereby realizing the synchronous drive of a single motor for pulping, feeding, and purging actions.

6. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 5, characterized in that: A linkage turntable (407) is fixedly installed at the top of the longitudinal shaft (404). The linkage turntable (407) converts continuous rotation into eccentric reciprocating motion. A horizontal movable rod (408) is rotatably installed on the upper surface of the linkage turntable (407). The horizontal movable rod (408) transmits eccentric reciprocating displacement. A limiting vertical plate (409) is fixedly installed on the upper surface of the top plate (201). The limiting vertical plate (409) is used to fix the corrugated compressed air cylinder (410) and limit the travel of the reciprocating push plate (411). A corrugated compressed air cylinder (410) is fixedly installed on the right side of the limiting vertical plate (409). The corrugated compressed air cylinder (410) relies on mechanical reciprocating motion. The motion compression generates a purge protective gas. The right end of the corrugated compressor cylinder (410) is fixedly connected to a reciprocating push plate (411). The reciprocating push plate (411) is located between the push rod (401) and the horizontal movable rod (408), and synchronously drives the push rod (401) to push linearly and compress the gas generated by the cylinder. The right end of the push rod (401) is fixedly connected to the left side of the reciprocating push plate (411). The right side of the reciprocating push plate (411) is fixedly connected to a rotating seat (412). The left end of the horizontal movable rod (408) is rotatably connected to the lower surface of the rotating seat (412). The hinge structure compensates for the angular offset caused by the eccentric movement of the turntable and avoids the mechanism from jamming.

7. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 6, characterized in that: The upper surface of the right end of the pulping cylinder (302) is fixedly embedded with a feed square tube (310). The feed square tube (310) serves as a gravity-fed feeding channel for magnesium alloy melt. The melt only flows into the annular cavity between the screw and the cylinder and does not enter the hollow screw (303) to prevent the magnesium melt from enveloping and jamming the push rod (401). The surface of the feed square tube (310) is provided with an air blowing component (5). The air blowing component (5) is used to blow away the magnesium melt remaining on the inner wall of the feed square tube (310), isolate the air from contact with the high-temperature magnesium melt, and prevent the inner wall of the feed square tube (310) from generating oxide clumps and blocking the feeding channel.

8. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 7, characterized in that: The air blowing assembly (5) includes an annular heating sleeve (501) fixedly sleeved around the feed square tube (310). The annular heating sleeve (501) completely wraps around the feed pipe to achieve all-round constant temperature insulation. Several electric heating tubes (504) are fixedly installed on the inner wall of the annular heating sleeve (501). The electric heating tubes (504) continuously supply heat to prevent the magnesium liquid on the tube wall from solidifying at low temperature. A strip-shaped air nozzle (502) is fixedly embedded in the inner wall of the feed square tube (310). The air inlet end of the strip-shaped air nozzle (502) extends into the interior of the annular heating sleeve (501), and the air inlet end of the strip-shaped air nozzle (502) extends into the interior of the annular heating sleeve (501). 2) The jet nozzle corresponds to the inner wall of the feed square tube (310) and forms a uniform blowing airflow along the tube wall. The output end of the corrugated compressor cylinder (410) is fixedly connected to a guide hose (503). The end of the guide hose (503) away from the corrugated compressor cylinder (410) extends into the interior of the annular heating jacket (501) to deliver compressed protective gas to the jet nozzle. The inlet end of the corrugated compressor cylinder (410) is fixedly provided with an inlet pipe. The inlet of the inlet pipe is provided with a one-way inlet valve. The one-way valve only allows inert protective gas to be drawn in one direction to prevent high-temperature magnesium gas from backflowing and damaging the cylinder.

9. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 8, characterized in that: The sleeve assembly (20) includes a support sleeve (2001) and a telescopic rod (2002). The telescopic rod (2002) is slidably disposed on the inner wall of the support sleeve (2001). A support spring (2003) is fixedly installed at the bottom end of the telescopic rod (2002) and the inner bottom wall of the support sleeve (2001). The support spring (2003) absorbs the equipment vibration generated by the rotation of the screw and the reciprocating of the pusher, reduces the cylinder offset and seal wear, and plays a shock absorption and buffering role.

10. A magnesium alloy semi-solid pulping machine for a cold chamber die casting machine according to claim 9, characterized in that: The lifting adjustment mechanism (2) also includes two hydraulic push rods (202) fixedly installed at the bottom of the translation frame (102). The hydraulic push rods (202) provide active lifting power. The telescopic end of the hydraulic push rods (202) extends to the top of the translation frame (102) and is fixedly connected to the lower surface of the top plate (201). The overall lifting is driven by the extension and retraction of the push rods, and the height of the slurry cylinder (302) and the slurry nozzle is quickly adjusted to adapt to the pressure chamber feeding height of cold chamber die casting machines of different tonnages.

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