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.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention

[0001] The present invention relates to an integrated system of a melting device and a liquid injection mechanism and an injection method thereof, particularly to a mechanism that allows a melting furnace to simultaneously send molten alloy directly to one or multiple metal injection molding machines for performing different or identical alloy injection molding.2. Description of the Prior Art

[0002] Referring to FIG. 1, a conventional metal injection molding machine comprises a machine platform 11, wherein the machine platform 11 is provided with an injection device 12 horizontally fixed at the lower end of the machine platform 11; a melting cylinder 13 installed above the injection device 12; a mold device 14 installed on the machine platform 11 corresponding to and in front of the injection device 12; and a driving device 15 mounted on the machine platform 11 corresponding to and behind the injection device 12. The melting cylinder 13 is positioned horizontally, with an upright holding furnace 131 above its rear end, and the input end 132 of its front end is equipped with a feeding device 16, wherein the feeding device 16 has multiple rod-shaped alloy materials 161 (magnesium alloy billets) installed. A hydraulic cylinder 121 to prevent backflow is provided under the injection device 12. Heaters 133, 122 are provided, encasing and surrounding the outer periphery of the melting cylinder 13 and the front end of the injection device 12. The feeding device 16 can send the alloy material 161 (magnesium alloy billets) into the melting cylinder 13 to melt into molten alloy.

[0003] During use, the feeding device 16 sends the alloy material 161 (magnesium alloy billets) into the melting cylinder 13. By the heating of the heaters 133, 122, the rod-shaped alloy material 161 is melted into molten alloy. The molten alloy is then directly sent into the injection device 12. Through the action of the driving device 15, the molten alloy is extruded from the front end of the injection device 12 into the mold device 14 for cooling and molding, completing the alloy injection molding process.

[0004] Although the aforementioned melting cylinder 13 can pre-melt the rod-shaped alloy material 161 into molten alloy for injection molding in the injection device 12, this conventional metal injection molding machine has the following deficiencies in use.

[0005] 1. Difficulty in feeding: The rod-shaped alloy material 161 can easily get stuck due to different physical thermal expansion coefficients for each material (some materials have non-linear thermal expansion coefficients). When the rod-shaped alloy material 161 enters the melting cylinder 13 and melts into molten alloy, temperature rise can lead to jamming of alloy materials 161 with non-linear thermal expansion coefficients, easily causing the feeding device 16 to feed inconsistently or be interrupted. Moreover, the rod-shaped alloy material 161 is cylindrical, and besides the smelting process, the rod-shaped alloy material 161 also requires a machining process, which results in waste material loss during machining, significantly increasing costs.

[0006] 2. High impurity content leading to more slag: Due to poor air-tightness of the holding furnace 131's upper cover, external air and moisture can easily enter the holding furnace 131. Combined with the moisture in the melting cylinder 13 before preheating, this situation causes the molten alloy to come into contact with air and moisture, becoming oxidized and forming more impurities or slag. These impurities will be sent directly into the injection device 12 along with the molten alloy and be injection molded together, resulting in poor quality of the molded products. Alternatively, these impurities or slag may also block the temperature sensor's ability to detect temperature, causing erroneous signals and affecting the normal operation of the machine platform 11.

[0007] 3. The protective gas used in the holding furnace 131 of the conventional metal

[0008] injection molding machine is likely to be a gas with a high Global Warming Potential (GWP), such as SF6 or HFO. In particular, the GWP value of SF6 is over 20,000 times that of CO2, which will contribute to global warming.

[0009] Therefore, it is evident that the aforementioned conventional product still has many deficiencies and is not a good design, thus urgently needing improvement.SUMMARY OF THE INVENTION

[0010] In view of this, based on many years of experience in manufacturing, development, and design of related products, the inventor of the present invention has carefully designed and evaluated the aforementioned objectives, finally achieving the present invention with practicality.

[0011] One objective of the present invention is to provide an integrated system of a melting device and a liquid injection mechanism and an injection method thereof, which allows a melting furnace to simultaneously send multiple portions of molten alloy directly to one or multiple metal injection molding machines, to perform different or identical alloy injection molding.

[0012] Another objective of the present invention is to provide an integrated system of a melting device and a liquid injection mechanism and an injection method thereof, which uses an alloy melting furnace to melt a raw material or an alloy material, avoiding the problem of difficult feeding. Moreover, the holding furnace has good air-tightness, preventing air and moisture from entering the melting cylinder, thus reducing the oxidation of the molten alloy and the formation of impurities or slag. Additionally, the capacity and dimensions of the alloy melting furnace and holding furnace can be planned according to the actual “weight / shot” and “cycle time” requirements of the liquid injection machine, ensuring high safety.

[0013] According to the aforementioned objectives, the integrated system of a melting device and a liquid injection mechanism and its injection method of the present invention mainly comprises: a machine platform, comprising: an injection device, a melting cylinder, a mold device, and a driving device; wherein the injection device is horizontally fixed at the lower end of the machine platform; the melting cylinder is installed above the injection device and positioned horizontally, with its lower front end connected to an input end of the injection device and an upright holding furnace at its upper rear end. The melting cylinder and the holding furnace are equipped with a heater which encases and surrounds 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. The mold device is installed on the machine platform corresponding to and in front of the injection device, and the driving device is mounted on the machine platform corresponding to and behind the injection device. In use, 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. 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, thus completing the alloy injection molding.

[0014] Furthermore, in the present invention, the holding furnace (POT) 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 encasing and 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.

[0015] Furthermore, in the present invention, 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.

[0016] Furthermore, in the present invention, 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.

[0017] Furthermore, in the present invention, 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.

[0018] Furthermore, in the present invention, 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.

[0019] Furthermore, in the present invention, 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.

[0020] Furthermore, in the present invention, the alloy melting furnace melts the raw material or alloy material into molten alloy, wherein the alloy material is a magnesium alloy billet, and the magnesium alloy billet is a magnesium-lithium alloy billet.

[0021] Furthermore, in the present invention, 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.

[0022] Furthermore, in the present invention, 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 at its periphery 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 at its periphery for heat insulation.

[0023] Furthermore, in the present invention, the bellows can be made of steel material, and the internal sleeve is made of steel material or heat-resistant ceramic material.

[0024] Furthermore, in the present invention, among the at least three ports on the outer cover at the upper end part 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.

[0025] Furthermore, in the present invention, 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 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.

[0026] Furthermore, in the present invention, the inert gas is argon.

[0027] Furthermore, in the present invention, 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.

[0028] Furthermore, in the present invention, the driving device is an injection oil cylinder or an injection pneumatic cylinder.

[0029] Furthermore, in the present invention, the alloy melting furnace is equipped with a stirring device for stirring molten liquid.

[0030] Furthermore, in the present invention, a lifting device is provided under the alloy melting furnace to raise or lower the height of the alloy melting furnace.

[0031] Furthermore, in the present invention, there can be multiple alloy melting furnaces, with one alloy melting furnace melting molten alloy on standby during molten alloy transportation, to achieve continuous production.

[0032] To enable the esteemed examiner to further recognize and understand the purpose, shape, structural device characteristics and effects of the present invention, embodiments will be described in conjunction with figures, with detailed explanations as follows.BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG. 1 is a plan view diagram of a conventional metal injection molding machine.

[0034] FIG. 2 is a plan view diagram of the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention.

[0035] FIG. 3 is a side view diagram of the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention.

[0036] FIG. 4 is a multi-view diagram of the upper end part of the injection crucible in the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention.

[0037] FIG. 5 is a plan view diagram of the injection crucible in the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention.

[0038] FIGS. 6, 7, and 8 are continuous action diagrams of injecting metal molten liquid in the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention.

[0039] FIGS. 9, 10, and 11 are continuous action diagrams of injecting metal molten liquid in another preferred embodiment of the integrated system of a melting device and a liquid injection mechanism and the injection method of the present invention.

[0040] FIG. 12 is an action flow chart of the injection method for the integrated system of a melting device and a liquid injection mechanism of the present invention.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] The present invention relates to an “integrated system of a melting device and a liquid injection mechanism”. Referring to FIGS. 2 to 11, the integrated system of a melting device and a liquid injection mechanism of the present invention mainly comprises: a machine platform 21, which includes: an injection device 22, a melting cylinder 23, a mold device 24, and a driving device 26.

[0042] The injection device 22 is horizontally fixed at the lower end of the machine platform 21.

[0043] The melting cylinder 23 is installed above the injection device 22. The melting cylinder 23 is positioned horizontally, with its lower front end connected to an input end of the injection device 22. Its upper rear end has an upright holding furnace 25. The melting cylinder 23 and the holding furnace 25 are equipped with heaters 231, 2510 encasing and surrounding the lower outer periphery of the melting cylinder 23 and holding furnace 25. The holding furnace 25 is connected to an alloy melting furnace 31 through an input pipe 27.

[0044] The mold device 24 is installed on the machine platform 21 corresponding to and in front of the injection device 22.

[0045] The driving device 26 is mounted on the machine platform 21 corresponding to and behind the injection device 22.

[0046] By means of the above construction, in use, the alloy melting furnace 31 melts a raw material or an alloy material into molten alloy, which is sent through the input pipe 27 into the holding furnace 25, and then flows into the melting cylinder 23. By means of the heaters 231, 2510, the molten alloy can be kept warm, then flows into the injection device 22, and the molten alloy can be extruded from a front end of the injection device 22 by the action of the driving device 26, and then enters the mold device 24 for cooling and molding, completing the alloy injection molding.

[0047] The holding furnace 25 (POT) has an upper end part 251, with an upper flange 252 on the upper end part 251. An O-ring 253 is provided above the upper flange 252, and an outer cover 254 is above the O-ring 253. A lower flange 255 is at the lower end of the upper end part 251. The outer cover 254 has a cooling water output / input waterway 256 at its upper end, and between the upper flange 252 and the lower flange 255 is a cooling water input / output waterway 257 encasing and surrounding the outer wall of the holding furnace 25. The cooling water output / input waterway 256 and the cooling water input / output waterway 257 are interconnected, so that a flow of cooling water (not shown in the FIG.) in the cooling water output / input waterway 256 and the cooling water input / output waterway 257 provides a heat insulation effect to the lower flange 255. The O-ring 253 provides air-tightness to the holding furnace 25.

[0048] A differential pressure sensor 41 is further provided in the holding furnace 25, and the differential pressure sensor 41 is connected to a control circuit 42 on the machine platform 21, for measuring a pressure difference in the holding furnace 25 to predict pressure changes inside the holding furnace 25.

[0049] At least one temperature sensor 43 is further provided in the holding furnace 25, and the temperature sensor 43 is connected to a control circuit 42 on the machine platform 21, for measuring temperature changes inside the holding furnace 25.

[0050] At least one liquid level sensor 44 is further provided in the holding furnace 25, and the liquid level sensor is connected to a control circuit 42 on the machine platform 21, for measuring a liquid level of the molten alloy in the holding furnace 25 to predict changes in the level of the molten alloy inside the holding furnace 25.

[0051] The alloy melting furnace 31 sends the molten alloy into the holding furnace 25 through the input pipe 27 by means of crucible tilting, earth gravity, a metering pump, inert gas pressure difference, or a plunger.

[0052] The alloy melting furnace 31 melts the raw material or alloy material into molten alloy, wherein the alloy material is a magnesium alloy billet, and the magnesium alloy billet is a magnesium-lithium or magnesium-lithium-aluminum alloy billet.

[0053] The outer cover 254 at the upper end part 251 of the holding furnace 25 has at least three ports, one of which is connected to the alloy melting furnace 31 through the input pipe 27.

[0054] An upper isolation valve 271 is provided at the connection between the input pipe 27 and the holding furnace 25. The upper isolation valve 271 is surrounded by an upper cooling water circuit 272 for heat insulation. The lower end of the upper isolation valve 271 is connected to a bellows 273. The inner side of the bellows 273 is connected to an internal sleeve 274 for alloy liquid guidance and splash prevention. The outer side of the internal sleeve 274 is connected to a lower isolation valve 275. The lower isolation valve 275 is surrounded by a lower cooling water circuit 276 at its periphery for heat insulation. The bellows 273 can be made of steel material, and the internal sleeve 274 can be made of steel material or heat-resistant ceramic material.

[0055] Among the at least three ports on the outer cover 254 at the upper end part 251 of the holding furnace 25, another port is equipped with a vacuum pump 259 externally.

[0056] The vacuum pump 259 pumps the holding furnace 25 to remove moisture and air from the holding furnace 25, thereby reducing moisture and oxygen in the alloy melting furnace 31, input pipe 27, and holding furnace 25, improving the phenomenon of oxide film and slag formation of the molten alloy in the alloy melting furnace 31, input pipe 27, and holding furnace 25. The vacuum pump 259 creates negative pressure or pressure difference, allowing the alloy melting furnace 31 to send the molten alloy more smoothly into the holding furnace 25 through the input pipe 27 by earth gravity and negative pressure or pressure difference.

[0057] Among the at least three ports on the outer cover 254 at the upper end part 251 of the holding furnace 25, yet another port is equipped with a protective gas pipeline 2511. The protective gas pipeline 2511 is connected to the alloy melting furnace 31. The alloy melting furnace 31 can supply air or inert gas (such as argon) through the protective gas pipeline 2511 to reduce the contact of moisture and oxygen with the molten alloy in the alloy melting furnace 31, input pipe 27, and holding furnace 25, improving the phenomenon of oxide film and slag formation in the alloy melting furnace 31, input pipe 27, and holding furnace 25.

[0058] The alloy melting furnace 31 sends the molten alloy through the input pipe 27 into holding furnaces 25 of multiple different machine platforms 21, utilizing the same or different mold devices 24, to perform molding of different or the same alloy injections.

[0059] The driving device 26 is an injection oil cylinder or an injection pneumatic cylinder.

[0060] The alloy melting furnace 31 is equipped with a stirring device 311 for stirring molten liquid, as shown in FIG. 3.

[0061] A lifting device 312 is provided under the alloy melting furnace 31 to raise or lower the height of the alloy melting furnace, as shown in FIG. 3.

[0062] Referring to FIGS. 9, 10, and 11, in another preferred embodiment of the present invention, the alloy melting furnace 31 melts the alloy material into molten alloy, which is then sent into the holding furnace 25 using a tilting method for pouring liquid.

[0063] Referring to FIG. 12, the injection method for the integrated system of a melting device and a liquid injection mechanism of the present invention includes the following steps.

[0064] Step 1: The alloy melting furnace 31 melts the alloy material into molten alloy.

[0065] Step 2: The molten alloy is sent from the alloy melting furnace 31 through the input pipe 27 into the holding furnace 25, and flows into the melting cylinder 23. By means of the heaters 231, 2510, the molten alloy can be kept warm, and then flows into the injection device 22.

[0066] Step 3: The injection device 22 extrudes the molten alloy from a front end of the injection device 22 by the action of the driving device 26.

[0067] Step 4: The molten alloy enters the mold device 24 for cooling and molding, completing the alloy injection molding.

[0068] Referring again to FIG. 12, the alloy melting furnace 31 melts the raw material or alloy material into molten alloy, which is sent into the holding furnace 25 through the input pipe 27 by means of negative pressure or pressure difference.

[0069] Referring again to FIG. 12, the alloy melting furnace 31 melts the raw material or alloy material into molten alloy, which is sent into the holding furnace 25 through the input pipe 27 by means of crucible tilting, earth gravity, a metering pump, inert gas pressure difference, or a plunger.

[0070] In summary, the integrated system of a melting device and a liquid injection mechanism and the injection method thereof of the present invention indeed possesses an unprecedented innovative structure. It has not been seen in any publication, and no similar products are found in the market, so its novelty should be undoubted. Moreover, the unique features and functions of the present invention far surpass those of conventional devices, demonstrating its inventive step over conventional methods, and thus meeting the application requirements for invention patents prescribed in patent law. Therefore, the present patent application is filed in accordance with the law.

[0071] The above description represents only the best specific embodiment of the present invention. However, the structural features of the present invention are not limited to those. Any changes or modifications that can be easily conceived by those skilled in the art within the field of the present invention are covered in the following patent claims of the present application.

Claims

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; anda 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.

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