Integrated system of melting device and liquid injection mechanism and injection method thereof

Abstract

An integrated system of a melting device and a liquid injection mechanism and an injection method thereof, including: a machine platform, an injection device, a melting cylinder, a mold device and a driving device; wherein the melting cylinder is installed above the injection device, the lower part of the front end of the melting cylinder is connected to the input end of the injection device, and there is an upright holding furnace above the rear end; where an alloy melting furnace melts materials into alloy molten liquid, which flows through an input pipe into the holding furnace and into the melting cylinder. Through a heater, the alloy molten liquid is kept warm and flows into the injection device, where it is extruded from the front end of the injection device by the driving device, entering the mold device for cooling and molding to complete the alloy injection molding.

1 . An integrated system of a melting device and a liquid injection mechanism, comprising:
 a machine platform, including:
 an injection device, horizontally fixed at the lower end of the machine platform; 
 a melting cylinder, installed above the injection device, horizontally positioned, with its lower front end connected to an input end of the injection device; 
 an upright holding furnace, located above the rear end of the melting cylinder, wherein the holding furnace and the melting cylinder are equipped with a heater surrounding the lower outer periphery of the melting cylinder and holding furnace, and the holding furnace is connected to an alloy melting furnace through an input pipe; 
 a mold device, installed on the machine platform corresponding to and in front of the injection device; and 
 a driving device, mounted on the machine platform corresponding to and behind the injection device; 
   wherein the alloy melting furnace melts a raw material or an alloy material into molten alloy, which is sent through the input pipe into the holding furnace and flows into the melting cylinder, and by means of the heaters, the molten alloy can be kept warm, then flows into the injection device, and the molten alloy can be extruded from a front end of the injection device by the action of the driving device, and then enters the mold device for cooling and molding.   
     
     
         2 . The integrated system of a melting device and a liquid injection mechanism according to  claim 1 , wherein the holding furnace has an upper end part with an upper flange, an outer cover above the upper flange, and a lower flange at the lower end of the upper end part, the outer cover has a cooling water output/input waterway at its upper end, and between the upper flange and the lower flange is a cooling water input/output waterway surrounding the outer wall of the holding furnace, the cooling water output/input waterway and the cooling water input/output waterway are interconnected, so that a flow of cooling water in the cooling water output/input waterway and the cooling water input/output waterway provides a heat insulation effect to the lower flange. 
     
     
         3 . The integrated system of a melting device and a liquid injection mechanism according to  claim 2 , wherein an O-ring is further provided above the upper flange of the upper end part of the holding furnace, and the O-ring is provided between the upper flange and the outer cover, to provide better air-tightness to the holding furnace. 
     
     
         4 . The integrated system of a melting device and a liquid injection mechanism according to  claim 3 , wherein a differential pressure sensor is further provided in the holding furnace, and the differential pressure sensor is connected to a control circuit on the machine platform, for measuring a pressure difference in the holding furnace to predict pressure changes inside the holding furnace. 
     
     
         5 . The integrated system of a melting device and a liquid injection mechanism according to  claim 4 , wherein at least one temperature sensor is further provided in the holding furnace, and the temperature sensor is connected to a control circuit on the machine platform, for measuring temperature changes inside the holding furnace. 
     
     
         6 . The integrated system of a melting device and a liquid injection mechanism according to  claim 5 , wherein at least one liquid level sensor is further provided in the holding furnace, and the liquid level sensor is connected to a control circuit on the machine platform, for measuring a liquid level of the molten alloy in the holding furnace to predict changes in the level of the molten alloy inside the holding furnace. 
     
     
         7 . The integrated system of a melting device and a liquid injection mechanism according to  claim 6 , wherein the alloy melting furnace sends the molten alloy into the holding furnace through the input pipe by means of crucible tilting, earth gravity, a metering pump, inert gas pressure difference, or a plunger. 
     
     
         8 . The integrated system of a melting device and a liquid injection mechanism according to  claim 7 , wherein the alloy melting furnace melts the raw material or alloy material into molten alloy, wherein the alloy is a magnesium alloy billet, and the magnesium alloy billet is a magnesium-lithium or magnesium-lithium-aluminum alloy billet. 
     
     
         9 . The integrated system of a melting device and a liquid injection mechanism according to  claim 8 , wherein the outer cover at the upper end part of the holding furnace has at least three ports, one of which is connected to the alloy melting furnace through the input pipe. 
     
     
         10 . The integrated system of a melting device and a liquid injection mechanism according to  claim 9 , wherein an upper isolation valve is provided at the connection between the input pipe and the holding furnace, the upper isolation valve is surrounded by an upper cooling water circuit for heat insulation, the lower end of the upper isolation valve is connected to a bellows, the inner side of the bellows is connected to an internal sleeve for alloy liquid guidance and splash prevention, and the outer side of the internal sleeve is connected to a lower isolation valve, wherein the lower isolation valve is surrounded by a lower cooling water circuit for heat insulation. 
     
     
         11 . The integrated system of a melting device and a liquid injection mechanism according to  claim 10 , wherein the bellows can be made of steel material, and the internal sleeve is made of steel material or heat-resistant ceramic material. 
     
     
         12 . The integrated system of a melting device and a liquid injection mechanism according to  claim 11 , wherein among the at least three ports on the outer cover at the upper end of the holding furnace, another port is equipped with a vacuum pump externally, and the vacuum pump pumps the holding furnace to remove moisture and air from the holding furnace, thereby reducing moisture and oxygen in the alloy melting furnace, input pipe, and holding furnace, improving the phenomenon of oxide film and slag formation of the molten alloy in the alloy melting furnace, input pipe, and holding furnace, and wherein the vacuum pump creates negative pressure or pressure difference, allowing the alloy melting furnace to send the molten alloy more smoothly into the holding furnace through the input pipe by earth gravity and negative pressure or pressure difference. 
     
     
         13 . The integrated system of a melting device and a liquid injection mechanism according to  claim 12 , wherein among the at least three ports on the outer cover at the upper end part of the holding furnace, yet another port is equipped with a protective gas pipeline, through the protective gas pipeline the alloy melting furnace supplies air or inert gas to reduce the contact of moisture and oxygen with the molten alloy in the alloy melting furnace, input pipe, and holding furnace, improving the phenomenon of oxide film and slag formation in the alloy melting furnace, input pipe, and holding furnace. 
     
     
         14 . The integrated system of a melting device and a liquid injection mechanism according to  claim 13 , wherein the inert gas is argon. 
     
     
         15 . The integrated system of a melting device and a liquid injection mechanism according to  claim 14 , wherein the alloy melting furnace sends the molten alloy through the input pipe into holding furnaces of multiple different machine platforms, utilizing the same or different mold devices, to perform molding of different or the same alloy injections. 
     
     
         16 . The integrated system of a melting device and a liquid injection mechanism according to  claim 15 , wherein the driving device is an injection oil cylinder or an injection pneumatic cylinder. 
     
     
         17 . The integrated system of a melting device and a liquid injection mechanism according to  claim 16 , wherein the alloy melting furnace is equipped with a stirring device for stirring molten liquid. 
     
     
         18 . The integrated system of a melting device and a liquid injection mechanism according to  claim 17 , wherein a lifting device is provided under the alloy melting furnace to raise or lower the height of the alloy melting furnace. 
     
     
         19 . An injection method for an integrated system of a melting device and a liquid injection mechanism, comprising the steps of:
 step 1: an alloy melting furnace melts a raw material or an alloy material into molten alloy;   step 2: molten alloy is sent through an input pipe into a holding furnace and flows into a melting cylinder, where the molten alloy is kept warm by heaters, and then flows into an injection device;   step 3: the injection device extrudes the molten alloy from a front end of the injection device by the action of a driving device;   step 4: the molten alloy enters a mold device for cooling and molding to complete alloy injection molding.   
     
     
         20 . The injection method for an integrated system of a melting device and a liquid injection mechanism according to  claim 19 , wherein the alloy melting furnace melts the raw material or alloy material into the molten alloy, which is sent into the holding furnace through the input pipe by means of negative pressure or pressure difference. 
     
     
         21 . The injection method for an integrated system of a melting device and a liquid injection mechanism according to  claim 19 , wherein the alloy melting furnace melts the raw material or alloy material into the molten alloy, which is sent to the holding furnace through the input pipe by means of crucible tilting, earth gravity, a metering pump, inert gas pressure difference, or a plunger.